mirror of https://gitee.com/openkylin/linux.git
5290 lines
135 KiB
C
5290 lines
135 KiB
C
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/*
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rbd.c -- Export ceph rados objects as a Linux block device
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based on drivers/block/osdblk.c:
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Copyright 2009 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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For usage instructions, please refer to:
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Documentation/ABI/testing/sysfs-bus-rbd
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*/
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/osd_client.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/decode.h>
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#include <linux/parser.h>
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#include <linux/bsearch.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include "rbd_types.h"
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#define RBD_DEBUG /* Activate rbd_assert() calls */
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/*
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* The basic unit of block I/O is a sector. It is interpreted in a
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* number of contexts in Linux (blk, bio, genhd), but the default is
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* universally 512 bytes. These symbols are just slightly more
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* meaningful than the bare numbers they represent.
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*/
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#define SECTOR_SHIFT 9
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#define SECTOR_SIZE (1ULL << SECTOR_SHIFT)
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/*
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* Increment the given counter and return its updated value.
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* If the counter is already 0 it will not be incremented.
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* If the counter is already at its maximum value returns
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* -EINVAL without updating it.
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*/
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static int atomic_inc_return_safe(atomic_t *v)
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{
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unsigned int counter;
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counter = (unsigned int)__atomic_add_unless(v, 1, 0);
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if (counter <= (unsigned int)INT_MAX)
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return (int)counter;
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atomic_dec(v);
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return -EINVAL;
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}
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/* Decrement the counter. Return the resulting value, or -EINVAL */
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static int atomic_dec_return_safe(atomic_t *v)
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{
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int counter;
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counter = atomic_dec_return(v);
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if (counter >= 0)
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return counter;
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atomic_inc(v);
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return -EINVAL;
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}
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#define RBD_DRV_NAME "rbd"
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#define RBD_DRV_NAME_LONG "rbd (rados block device)"
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#define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */
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#define RBD_SNAP_DEV_NAME_PREFIX "snap_"
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#define RBD_MAX_SNAP_NAME_LEN \
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(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
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#define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */
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#define RBD_SNAP_HEAD_NAME "-"
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#define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */
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/* This allows a single page to hold an image name sent by OSD */
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#define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
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#define RBD_IMAGE_ID_LEN_MAX 64
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#define RBD_OBJ_PREFIX_LEN_MAX 64
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/* Feature bits */
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#define RBD_FEATURE_LAYERING (1<<0)
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#define RBD_FEATURE_STRIPINGV2 (1<<1)
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#define RBD_FEATURES_ALL \
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(RBD_FEATURE_LAYERING | RBD_FEATURE_STRIPINGV2)
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/* Features supported by this (client software) implementation. */
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#define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL)
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/*
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* An RBD device name will be "rbd#", where the "rbd" comes from
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* RBD_DRV_NAME above, and # is a unique integer identifier.
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* MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
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* enough to hold all possible device names.
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*/
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#define DEV_NAME_LEN 32
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#define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
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/*
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* block device image metadata (in-memory version)
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*/
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struct rbd_image_header {
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/* These six fields never change for a given rbd image */
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char *object_prefix;
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__u8 obj_order;
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__u8 crypt_type;
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__u8 comp_type;
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u64 stripe_unit;
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u64 stripe_count;
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u64 features; /* Might be changeable someday? */
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/* The remaining fields need to be updated occasionally */
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u64 image_size;
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struct ceph_snap_context *snapc;
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char *snap_names; /* format 1 only */
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u64 *snap_sizes; /* format 1 only */
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};
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/*
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* An rbd image specification.
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*
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* The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
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* identify an image. Each rbd_dev structure includes a pointer to
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* an rbd_spec structure that encapsulates this identity.
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*
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* Each of the id's in an rbd_spec has an associated name. For a
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* user-mapped image, the names are supplied and the id's associated
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* with them are looked up. For a layered image, a parent image is
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* defined by the tuple, and the names are looked up.
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*
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* An rbd_dev structure contains a parent_spec pointer which is
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* non-null if the image it represents is a child in a layered
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* image. This pointer will refer to the rbd_spec structure used
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* by the parent rbd_dev for its own identity (i.e., the structure
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* is shared between the parent and child).
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*
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* Since these structures are populated once, during the discovery
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* phase of image construction, they are effectively immutable so
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* we make no effort to synchronize access to them.
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*
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* Note that code herein does not assume the image name is known (it
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* could be a null pointer).
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*/
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struct rbd_spec {
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u64 pool_id;
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const char *pool_name;
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const char *image_id;
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const char *image_name;
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u64 snap_id;
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const char *snap_name;
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struct kref kref;
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};
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/*
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* an instance of the client. multiple devices may share an rbd client.
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*/
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struct rbd_client {
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struct ceph_client *client;
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struct kref kref;
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struct list_head node;
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};
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struct rbd_img_request;
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typedef void (*rbd_img_callback_t)(struct rbd_img_request *);
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#define BAD_WHICH U32_MAX /* Good which or bad which, which? */
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struct rbd_obj_request;
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typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *);
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enum obj_request_type {
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OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES
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};
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enum obj_req_flags {
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OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */
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OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */
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OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */
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OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */
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};
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struct rbd_obj_request {
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const char *object_name;
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u64 offset; /* object start byte */
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u64 length; /* bytes from offset */
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unsigned long flags;
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/*
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* An object request associated with an image will have its
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* img_data flag set; a standalone object request will not.
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*
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* A standalone object request will have which == BAD_WHICH
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* and a null obj_request pointer.
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*
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* An object request initiated in support of a layered image
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* object (to check for its existence before a write) will
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* have which == BAD_WHICH and a non-null obj_request pointer.
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*
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* Finally, an object request for rbd image data will have
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* which != BAD_WHICH, and will have a non-null img_request
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* pointer. The value of which will be in the range
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* 0..(img_request->obj_request_count-1).
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*/
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union {
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struct rbd_obj_request *obj_request; /* STAT op */
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struct {
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struct rbd_img_request *img_request;
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u64 img_offset;
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/* links for img_request->obj_requests list */
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struct list_head links;
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};
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};
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u32 which; /* posn image request list */
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enum obj_request_type type;
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union {
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struct bio *bio_list;
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struct {
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struct page **pages;
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u32 page_count;
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};
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};
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struct page **copyup_pages;
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u32 copyup_page_count;
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struct ceph_osd_request *osd_req;
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u64 xferred; /* bytes transferred */
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int result;
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rbd_obj_callback_t callback;
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struct completion completion;
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struct kref kref;
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};
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enum img_req_flags {
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IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */
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IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */
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IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */
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};
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struct rbd_img_request {
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struct rbd_device *rbd_dev;
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u64 offset; /* starting image byte offset */
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u64 length; /* byte count from offset */
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unsigned long flags;
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union {
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u64 snap_id; /* for reads */
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struct ceph_snap_context *snapc; /* for writes */
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};
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union {
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struct request *rq; /* block request */
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struct rbd_obj_request *obj_request; /* obj req initiator */
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};
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struct page **copyup_pages;
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u32 copyup_page_count;
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spinlock_t completion_lock;/* protects next_completion */
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u32 next_completion;
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rbd_img_callback_t callback;
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u64 xferred;/* aggregate bytes transferred */
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int result; /* first nonzero obj_request result */
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u32 obj_request_count;
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struct list_head obj_requests; /* rbd_obj_request structs */
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struct kref kref;
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};
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#define for_each_obj_request(ireq, oreq) \
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list_for_each_entry(oreq, &(ireq)->obj_requests, links)
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#define for_each_obj_request_from(ireq, oreq) \
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list_for_each_entry_from(oreq, &(ireq)->obj_requests, links)
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#define for_each_obj_request_safe(ireq, oreq, n) \
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list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
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struct rbd_mapping {
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u64 size;
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u64 features;
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bool read_only;
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};
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/*
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* a single device
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*/
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struct rbd_device {
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int dev_id; /* blkdev unique id */
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int major; /* blkdev assigned major */
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struct gendisk *disk; /* blkdev's gendisk and rq */
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u32 image_format; /* Either 1 or 2 */
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struct rbd_client *rbd_client;
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char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
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spinlock_t lock; /* queue, flags, open_count */
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struct rbd_image_header header;
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unsigned long flags; /* possibly lock protected */
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struct rbd_spec *spec;
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char *header_name;
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struct ceph_file_layout layout;
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struct ceph_osd_event *watch_event;
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struct rbd_obj_request *watch_request;
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struct rbd_spec *parent_spec;
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u64 parent_overlap;
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atomic_t parent_ref;
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struct rbd_device *parent;
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/* protects updating the header */
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struct rw_semaphore header_rwsem;
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struct rbd_mapping mapping;
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struct list_head node;
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/* sysfs related */
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struct device dev;
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unsigned long open_count; /* protected by lock */
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};
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/*
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* Flag bits for rbd_dev->flags. If atomicity is required,
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* rbd_dev->lock is used to protect access.
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*
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* Currently, only the "removing" flag (which is coupled with the
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* "open_count" field) requires atomic access.
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*/
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enum rbd_dev_flags {
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RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */
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RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */
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};
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static DEFINE_MUTEX(client_mutex); /* Serialize client creation */
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static LIST_HEAD(rbd_dev_list); /* devices */
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static DEFINE_SPINLOCK(rbd_dev_list_lock);
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static LIST_HEAD(rbd_client_list); /* clients */
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static DEFINE_SPINLOCK(rbd_client_list_lock);
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/* Slab caches for frequently-allocated structures */
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static struct kmem_cache *rbd_img_request_cache;
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static struct kmem_cache *rbd_obj_request_cache;
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static struct kmem_cache *rbd_segment_name_cache;
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static int rbd_img_request_submit(struct rbd_img_request *img_request);
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static void rbd_dev_device_release(struct device *dev);
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static ssize_t rbd_add(struct bus_type *bus, const char *buf,
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size_t count);
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static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
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size_t count);
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static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping);
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static void rbd_spec_put(struct rbd_spec *spec);
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static BUS_ATTR(add, S_IWUSR, NULL, rbd_add);
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static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove);
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static struct attribute *rbd_bus_attrs[] = {
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&bus_attr_add.attr,
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&bus_attr_remove.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(rbd_bus);
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static struct bus_type rbd_bus_type = {
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.name = "rbd",
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.bus_groups = rbd_bus_groups,
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};
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static void rbd_root_dev_release(struct device *dev)
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{
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}
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static struct device rbd_root_dev = {
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.init_name = "rbd",
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.release = rbd_root_dev_release,
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};
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static __printf(2, 3)
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void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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if (!rbd_dev)
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printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf);
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else if (rbd_dev->disk)
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printk(KERN_WARNING "%s: %s: %pV\n",
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RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf);
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else if (rbd_dev->spec && rbd_dev->spec->image_name)
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printk(KERN_WARNING "%s: image %s: %pV\n",
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RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf);
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else if (rbd_dev->spec && rbd_dev->spec->image_id)
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printk(KERN_WARNING "%s: id %s: %pV\n",
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RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf);
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else /* punt */
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printk(KERN_WARNING "%s: rbd_dev %p: %pV\n",
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RBD_DRV_NAME, rbd_dev, &vaf);
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va_end(args);
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}
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#ifdef RBD_DEBUG
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#define rbd_assert(expr) \
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if (unlikely(!(expr))) { \
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printk(KERN_ERR "\nAssertion failure in %s() " \
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"at line %d:\n\n" \
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"\trbd_assert(%s);\n\n", \
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__func__, __LINE__, #expr); \
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BUG(); \
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}
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#else /* !RBD_DEBUG */
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# define rbd_assert(expr) ((void) 0)
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#endif /* !RBD_DEBUG */
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static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request);
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static void rbd_img_parent_read(struct rbd_obj_request *obj_request);
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static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);
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static int rbd_dev_refresh(struct rbd_device *rbd_dev);
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static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev);
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static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev);
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static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
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u64 snap_id);
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static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
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u8 *order, u64 *snap_size);
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static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
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u64 *snap_features);
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static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name);
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static int rbd_open(struct block_device *bdev, fmode_t mode)
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{
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struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
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bool removing = false;
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if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only)
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return -EROFS;
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spin_lock_irq(&rbd_dev->lock);
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if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags))
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removing = true;
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else
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rbd_dev->open_count++;
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spin_unlock_irq(&rbd_dev->lock);
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if (removing)
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return -ENOENT;
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(void) get_device(&rbd_dev->dev);
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set_device_ro(bdev, rbd_dev->mapping.read_only);
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return 0;
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}
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static void rbd_release(struct gendisk *disk, fmode_t mode)
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{
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struct rbd_device *rbd_dev = disk->private_data;
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unsigned long open_count_before;
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spin_lock_irq(&rbd_dev->lock);
|
|
open_count_before = rbd_dev->open_count--;
|
|
spin_unlock_irq(&rbd_dev->lock);
|
|
rbd_assert(open_count_before > 0);
|
|
|
|
put_device(&rbd_dev->dev);
|
|
}
|
|
|
|
static const struct block_device_operations rbd_bd_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rbd_open,
|
|
.release = rbd_release,
|
|
};
|
|
|
|
/*
|
|
* Initialize an rbd client instance. Success or not, this function
|
|
* consumes ceph_opts. Caller holds client_mutex.
|
|
*/
|
|
static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *rbdc;
|
|
int ret = -ENOMEM;
|
|
|
|
dout("%s:\n", __func__);
|
|
rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL);
|
|
if (!rbdc)
|
|
goto out_opt;
|
|
|
|
kref_init(&rbdc->kref);
|
|
INIT_LIST_HEAD(&rbdc->node);
|
|
|
|
rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0);
|
|
if (IS_ERR(rbdc->client))
|
|
goto out_rbdc;
|
|
ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */
|
|
|
|
ret = ceph_open_session(rbdc->client);
|
|
if (ret < 0)
|
|
goto out_client;
|
|
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_add_tail(&rbdc->node, &rbd_client_list);
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc);
|
|
|
|
return rbdc;
|
|
out_client:
|
|
ceph_destroy_client(rbdc->client);
|
|
out_rbdc:
|
|
kfree(rbdc);
|
|
out_opt:
|
|
if (ceph_opts)
|
|
ceph_destroy_options(ceph_opts);
|
|
dout("%s: error %d\n", __func__, ret);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc)
|
|
{
|
|
kref_get(&rbdc->kref);
|
|
|
|
return rbdc;
|
|
}
|
|
|
|
/*
|
|
* Find a ceph client with specific addr and configuration. If
|
|
* found, bump its reference count.
|
|
*/
|
|
static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *client_node;
|
|
bool found = false;
|
|
|
|
if (ceph_opts->flags & CEPH_OPT_NOSHARE)
|
|
return NULL;
|
|
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_for_each_entry(client_node, &rbd_client_list, node) {
|
|
if (!ceph_compare_options(ceph_opts, client_node->client)) {
|
|
__rbd_get_client(client_node);
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
return found ? client_node : NULL;
|
|
}
|
|
|
|
/*
|
|
* mount options
|
|
*/
|
|
enum {
|
|
Opt_last_int,
|
|
/* int args above */
|
|
Opt_last_string,
|
|
/* string args above */
|
|
Opt_read_only,
|
|
Opt_read_write,
|
|
/* Boolean args above */
|
|
Opt_last_bool,
|
|
};
|
|
|
|
static match_table_t rbd_opts_tokens = {
|
|
/* int args above */
|
|
/* string args above */
|
|
{Opt_read_only, "read_only"},
|
|
{Opt_read_only, "ro"}, /* Alternate spelling */
|
|
{Opt_read_write, "read_write"},
|
|
{Opt_read_write, "rw"}, /* Alternate spelling */
|
|
/* Boolean args above */
|
|
{-1, NULL}
|
|
};
|
|
|
|
struct rbd_options {
|
|
bool read_only;
|
|
};
|
|
|
|
#define RBD_READ_ONLY_DEFAULT false
|
|
|
|
static int parse_rbd_opts_token(char *c, void *private)
|
|
{
|
|
struct rbd_options *rbd_opts = private;
|
|
substring_t argstr[MAX_OPT_ARGS];
|
|
int token, intval, ret;
|
|
|
|
token = match_token(c, rbd_opts_tokens, argstr);
|
|
if (token < 0)
|
|
return -EINVAL;
|
|
|
|
if (token < Opt_last_int) {
|
|
ret = match_int(&argstr[0], &intval);
|
|
if (ret < 0) {
|
|
pr_err("bad mount option arg (not int) "
|
|
"at '%s'\n", c);
|
|
return ret;
|
|
}
|
|
dout("got int token %d val %d\n", token, intval);
|
|
} else if (token > Opt_last_int && token < Opt_last_string) {
|
|
dout("got string token %d val %s\n", token,
|
|
argstr[0].from);
|
|
} else if (token > Opt_last_string && token < Opt_last_bool) {
|
|
dout("got Boolean token %d\n", token);
|
|
} else {
|
|
dout("got token %d\n", token);
|
|
}
|
|
|
|
switch (token) {
|
|
case Opt_read_only:
|
|
rbd_opts->read_only = true;
|
|
break;
|
|
case Opt_read_write:
|
|
rbd_opts->read_only = false;
|
|
break;
|
|
default:
|
|
rbd_assert(false);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get a ceph client with specific addr and configuration, if one does
|
|
* not exist create it. Either way, ceph_opts is consumed by this
|
|
* function.
|
|
*/
|
|
static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *rbdc;
|
|
|
|
mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING);
|
|
rbdc = rbd_client_find(ceph_opts);
|
|
if (rbdc) /* using an existing client */
|
|
ceph_destroy_options(ceph_opts);
|
|
else
|
|
rbdc = rbd_client_create(ceph_opts);
|
|
mutex_unlock(&client_mutex);
|
|
|
|
return rbdc;
|
|
}
|
|
|
|
/*
|
|
* Destroy ceph client
|
|
*
|
|
* Caller must hold rbd_client_list_lock.
|
|
*/
|
|
static void rbd_client_release(struct kref *kref)
|
|
{
|
|
struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref);
|
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc);
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_del(&rbdc->node);
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
ceph_destroy_client(rbdc->client);
|
|
kfree(rbdc);
|
|
}
|
|
|
|
/*
|
|
* Drop reference to ceph client node. If it's not referenced anymore, release
|
|
* it.
|
|
*/
|
|
static void rbd_put_client(struct rbd_client *rbdc)
|
|
{
|
|
if (rbdc)
|
|
kref_put(&rbdc->kref, rbd_client_release);
|
|
}
|
|
|
|
static bool rbd_image_format_valid(u32 image_format)
|
|
{
|
|
return image_format == 1 || image_format == 2;
|
|
}
|
|
|
|
static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk)
|
|
{
|
|
size_t size;
|
|
u32 snap_count;
|
|
|
|
/* The header has to start with the magic rbd header text */
|
|
if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)))
|
|
return false;
|
|
|
|
/* The bio layer requires at least sector-sized I/O */
|
|
|
|
if (ondisk->options.order < SECTOR_SHIFT)
|
|
return false;
|
|
|
|
/* If we use u64 in a few spots we may be able to loosen this */
|
|
|
|
if (ondisk->options.order > 8 * sizeof (int) - 1)
|
|
return false;
|
|
|
|
/*
|
|
* The size of a snapshot header has to fit in a size_t, and
|
|
* that limits the number of snapshots.
|
|
*/
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
size = SIZE_MAX - sizeof (struct ceph_snap_context);
|
|
if (snap_count > size / sizeof (__le64))
|
|
return false;
|
|
|
|
/*
|
|
* Not only that, but the size of the entire the snapshot
|
|
* header must also be representable in a size_t.
|
|
*/
|
|
size -= snap_count * sizeof (__le64);
|
|
if ((u64) size < le64_to_cpu(ondisk->snap_names_len))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Fill an rbd image header with information from the given format 1
|
|
* on-disk header.
|
|
*/
|
|
static int rbd_header_from_disk(struct rbd_device *rbd_dev,
|
|
struct rbd_image_header_ondisk *ondisk)
|
|
{
|
|
struct rbd_image_header *header = &rbd_dev->header;
|
|
bool first_time = header->object_prefix == NULL;
|
|
struct ceph_snap_context *snapc;
|
|
char *object_prefix = NULL;
|
|
char *snap_names = NULL;
|
|
u64 *snap_sizes = NULL;
|
|
u32 snap_count;
|
|
size_t size;
|
|
int ret = -ENOMEM;
|
|
u32 i;
|
|
|
|
/* Allocate this now to avoid having to handle failure below */
|
|
|
|
if (first_time) {
|
|
size_t len;
|
|
|
|
len = strnlen(ondisk->object_prefix,
|
|
sizeof (ondisk->object_prefix));
|
|
object_prefix = kmalloc(len + 1, GFP_KERNEL);
|
|
if (!object_prefix)
|
|
return -ENOMEM;
|
|
memcpy(object_prefix, ondisk->object_prefix, len);
|
|
object_prefix[len] = '\0';
|
|
}
|
|
|
|
/* Allocate the snapshot context and fill it in */
|
|
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
|
|
if (!snapc)
|
|
goto out_err;
|
|
snapc->seq = le64_to_cpu(ondisk->snap_seq);
|
|
if (snap_count) {
|
|
struct rbd_image_snap_ondisk *snaps;
|
|
u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len);
|
|
|
|
/* We'll keep a copy of the snapshot names... */
|
|
|
|
if (snap_names_len > (u64)SIZE_MAX)
|
|
goto out_2big;
|
|
snap_names = kmalloc(snap_names_len, GFP_KERNEL);
|
|
if (!snap_names)
|
|
goto out_err;
|
|
|
|
/* ...as well as the array of their sizes. */
|
|
|
|
size = snap_count * sizeof (*header->snap_sizes);
|
|
snap_sizes = kmalloc(size, GFP_KERNEL);
|
|
if (!snap_sizes)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Copy the names, and fill in each snapshot's id
|
|
* and size.
|
|
*
|
|
* Note that rbd_dev_v1_header_info() guarantees the
|
|
* ondisk buffer we're working with has
|
|
* snap_names_len bytes beyond the end of the
|
|
* snapshot id array, this memcpy() is safe.
|
|
*/
|
|
memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len);
|
|
snaps = ondisk->snaps;
|
|
for (i = 0; i < snap_count; i++) {
|
|
snapc->snaps[i] = le64_to_cpu(snaps[i].id);
|
|
snap_sizes[i] = le64_to_cpu(snaps[i].image_size);
|
|
}
|
|
}
|
|
|
|
/* We won't fail any more, fill in the header */
|
|
|
|
if (first_time) {
|
|
header->object_prefix = object_prefix;
|
|
header->obj_order = ondisk->options.order;
|
|
header->crypt_type = ondisk->options.crypt_type;
|
|
header->comp_type = ondisk->options.comp_type;
|
|
/* The rest aren't used for format 1 images */
|
|
header->stripe_unit = 0;
|
|
header->stripe_count = 0;
|
|
header->features = 0;
|
|
} else {
|
|
ceph_put_snap_context(header->snapc);
|
|
kfree(header->snap_names);
|
|
kfree(header->snap_sizes);
|
|
}
|
|
|
|
/* The remaining fields always get updated (when we refresh) */
|
|
|
|
header->image_size = le64_to_cpu(ondisk->image_size);
|
|
header->snapc = snapc;
|
|
header->snap_names = snap_names;
|
|
header->snap_sizes = snap_sizes;
|
|
|
|
/* Make sure mapping size is consistent with header info */
|
|
|
|
if (rbd_dev->spec->snap_id == CEPH_NOSNAP || first_time)
|
|
if (rbd_dev->mapping.size != header->image_size)
|
|
rbd_dev->mapping.size = header->image_size;
|
|
|
|
return 0;
|
|
out_2big:
|
|
ret = -EIO;
|
|
out_err:
|
|
kfree(snap_sizes);
|
|
kfree(snap_names);
|
|
ceph_put_snap_context(snapc);
|
|
kfree(object_prefix);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which)
|
|
{
|
|
const char *snap_name;
|
|
|
|
rbd_assert(which < rbd_dev->header.snapc->num_snaps);
|
|
|
|
/* Skip over names until we find the one we are looking for */
|
|
|
|
snap_name = rbd_dev->header.snap_names;
|
|
while (which--)
|
|
snap_name += strlen(snap_name) + 1;
|
|
|
|
return kstrdup(snap_name, GFP_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* Snapshot id comparison function for use with qsort()/bsearch().
|
|
* Note that result is for snapshots in *descending* order.
|
|
*/
|
|
static int snapid_compare_reverse(const void *s1, const void *s2)
|
|
{
|
|
u64 snap_id1 = *(u64 *)s1;
|
|
u64 snap_id2 = *(u64 *)s2;
|
|
|
|
if (snap_id1 < snap_id2)
|
|
return 1;
|
|
return snap_id1 == snap_id2 ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* Search a snapshot context to see if the given snapshot id is
|
|
* present.
|
|
*
|
|
* Returns the position of the snapshot id in the array if it's found,
|
|
* or BAD_SNAP_INDEX otherwise.
|
|
*
|
|
* Note: The snapshot array is in kept sorted (by the osd) in
|
|
* reverse order, highest snapshot id first.
|
|
*/
|
|
static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
u64 *found;
|
|
|
|
found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps,
|
|
sizeof (snap_id), snapid_compare_reverse);
|
|
|
|
return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX;
|
|
}
|
|
|
|
static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev,
|
|
u64 snap_id)
|
|
{
|
|
u32 which;
|
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id);
|
|
if (which == BAD_SNAP_INDEX)
|
|
return NULL;
|
|
|
|
return _rbd_dev_v1_snap_name(rbd_dev, which);
|
|
}
|
|
|
|
static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
|
|
{
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return RBD_SNAP_HEAD_NAME;
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_dev_v1_snap_name(rbd_dev, snap_id);
|
|
|
|
return rbd_dev_v2_snap_name(rbd_dev, snap_id);
|
|
}
|
|
|
|
static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_size)
|
|
{
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (snap_id == CEPH_NOSNAP) {
|
|
*snap_size = rbd_dev->header.image_size;
|
|
} else if (rbd_dev->image_format == 1) {
|
|
u32 which;
|
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id);
|
|
if (which == BAD_SNAP_INDEX)
|
|
return -ENOENT;
|
|
|
|
*snap_size = rbd_dev->header.snap_sizes[which];
|
|
} else {
|
|
u64 size = 0;
|
|
int ret;
|
|
|
|
ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*snap_size = size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features)
|
|
{
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (snap_id == CEPH_NOSNAP) {
|
|
*snap_features = rbd_dev->header.features;
|
|
} else if (rbd_dev->image_format == 1) {
|
|
*snap_features = 0; /* No features for format 1 */
|
|
} else {
|
|
u64 features = 0;
|
|
int ret;
|
|
|
|
ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*snap_features = features;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_mapping_set(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 snap_id = rbd_dev->spec->snap_id;
|
|
u64 size = 0;
|
|
u64 features = 0;
|
|
int ret;
|
|
|
|
ret = rbd_snap_size(rbd_dev, snap_id, &size);
|
|
if (ret)
|
|
return ret;
|
|
ret = rbd_snap_features(rbd_dev, snap_id, &features);
|
|
if (ret)
|
|
return ret;
|
|
|
|
rbd_dev->mapping.size = size;
|
|
rbd_dev->mapping.features = features;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev->mapping.size = 0;
|
|
rbd_dev->mapping.features = 0;
|
|
}
|
|
|
|
static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
|
|
{
|
|
char *name;
|
|
u64 segment;
|
|
int ret;
|
|
char *name_format;
|
|
|
|
name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO);
|
|
if (!name)
|
|
return NULL;
|
|
segment = offset >> rbd_dev->header.obj_order;
|
|
name_format = "%s.%012llx";
|
|
if (rbd_dev->image_format == 2)
|
|
name_format = "%s.%016llx";
|
|
ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, name_format,
|
|
rbd_dev->header.object_prefix, segment);
|
|
if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) {
|
|
pr_err("error formatting segment name for #%llu (%d)\n",
|
|
segment, ret);
|
|
kfree(name);
|
|
name = NULL;
|
|
}
|
|
|
|
return name;
|
|
}
|
|
|
|
static void rbd_segment_name_free(const char *name)
|
|
{
|
|
/* The explicit cast here is needed to drop the const qualifier */
|
|
|
|
kmem_cache_free(rbd_segment_name_cache, (void *)name);
|
|
}
|
|
|
|
static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset)
|
|
{
|
|
u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;
|
|
|
|
return offset & (segment_size - 1);
|
|
}
|
|
|
|
static u64 rbd_segment_length(struct rbd_device *rbd_dev,
|
|
u64 offset, u64 length)
|
|
{
|
|
u64 segment_size = (u64) 1 << rbd_dev->header.obj_order;
|
|
|
|
offset &= segment_size - 1;
|
|
|
|
rbd_assert(length <= U64_MAX - offset);
|
|
if (offset + length > segment_size)
|
|
length = segment_size - offset;
|
|
|
|
return length;
|
|
}
|
|
|
|
/*
|
|
* returns the size of an object in the image
|
|
*/
|
|
static u64 rbd_obj_bytes(struct rbd_image_header *header)
|
|
{
|
|
return 1 << header->obj_order;
|
|
}
|
|
|
|
/*
|
|
* bio helpers
|
|
*/
|
|
|
|
static void bio_chain_put(struct bio *chain)
|
|
{
|
|
struct bio *tmp;
|
|
|
|
while (chain) {
|
|
tmp = chain;
|
|
chain = chain->bi_next;
|
|
bio_put(tmp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* zeros a bio chain, starting at specific offset
|
|
*/
|
|
static void zero_bio_chain(struct bio *chain, int start_ofs)
|
|
{
|
|
struct bio_vec *bv;
|
|
unsigned long flags;
|
|
void *buf;
|
|
int i;
|
|
int pos = 0;
|
|
|
|
while (chain) {
|
|
bio_for_each_segment(bv, chain, i) {
|
|
if (pos + bv->bv_len > start_ofs) {
|
|
int remainder = max(start_ofs - pos, 0);
|
|
buf = bvec_kmap_irq(bv, &flags);
|
|
memset(buf + remainder, 0,
|
|
bv->bv_len - remainder);
|
|
flush_dcache_page(bv->bv_page);
|
|
bvec_kunmap_irq(buf, &flags);
|
|
}
|
|
pos += bv->bv_len;
|
|
}
|
|
|
|
chain = chain->bi_next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* similar to zero_bio_chain(), zeros data defined by a page array,
|
|
* starting at the given byte offset from the start of the array and
|
|
* continuing up to the given end offset. The pages array is
|
|
* assumed to be big enough to hold all bytes up to the end.
|
|
*/
|
|
static void zero_pages(struct page **pages, u64 offset, u64 end)
|
|
{
|
|
struct page **page = &pages[offset >> PAGE_SHIFT];
|
|
|
|
rbd_assert(end > offset);
|
|
rbd_assert(end - offset <= (u64)SIZE_MAX);
|
|
while (offset < end) {
|
|
size_t page_offset;
|
|
size_t length;
|
|
unsigned long flags;
|
|
void *kaddr;
|
|
|
|
page_offset = offset & ~PAGE_MASK;
|
|
length = min_t(size_t, PAGE_SIZE - page_offset, end - offset);
|
|
local_irq_save(flags);
|
|
kaddr = kmap_atomic(*page);
|
|
memset(kaddr + page_offset, 0, length);
|
|
flush_dcache_page(*page);
|
|
kunmap_atomic(kaddr);
|
|
local_irq_restore(flags);
|
|
|
|
offset += length;
|
|
page++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clone a portion of a bio, starting at the given byte offset
|
|
* and continuing for the number of bytes indicated.
|
|
*/
|
|
static struct bio *bio_clone_range(struct bio *bio_src,
|
|
unsigned int offset,
|
|
unsigned int len,
|
|
gfp_t gfpmask)
|
|
{
|
|
struct bio_vec *bv;
|
|
unsigned int resid;
|
|
unsigned short idx;
|
|
unsigned int voff;
|
|
unsigned short end_idx;
|
|
unsigned short vcnt;
|
|
struct bio *bio;
|
|
|
|
/* Handle the easy case for the caller */
|
|
|
|
if (!offset && len == bio_src->bi_size)
|
|
return bio_clone(bio_src, gfpmask);
|
|
|
|
if (WARN_ON_ONCE(!len))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(len > bio_src->bi_size))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(offset > bio_src->bi_size - len))
|
|
return NULL;
|
|
|
|
/* Find first affected segment... */
|
|
|
|
resid = offset;
|
|
bio_for_each_segment(bv, bio_src, idx) {
|
|
if (resid < bv->bv_len)
|
|
break;
|
|
resid -= bv->bv_len;
|
|
}
|
|
voff = resid;
|
|
|
|
/* ...and the last affected segment */
|
|
|
|
resid += len;
|
|
__bio_for_each_segment(bv, bio_src, end_idx, idx) {
|
|
if (resid <= bv->bv_len)
|
|
break;
|
|
resid -= bv->bv_len;
|
|
}
|
|
vcnt = end_idx - idx + 1;
|
|
|
|
/* Build the clone */
|
|
|
|
bio = bio_alloc(gfpmask, (unsigned int) vcnt);
|
|
if (!bio)
|
|
return NULL; /* ENOMEM */
|
|
|
|
bio->bi_bdev = bio_src->bi_bdev;
|
|
bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT);
|
|
bio->bi_rw = bio_src->bi_rw;
|
|
bio->bi_flags |= 1 << BIO_CLONED;
|
|
|
|
/*
|
|
* Copy over our part of the bio_vec, then update the first
|
|
* and last (or only) entries.
|
|
*/
|
|
memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx],
|
|
vcnt * sizeof (struct bio_vec));
|
|
bio->bi_io_vec[0].bv_offset += voff;
|
|
if (vcnt > 1) {
|
|
bio->bi_io_vec[0].bv_len -= voff;
|
|
bio->bi_io_vec[vcnt - 1].bv_len = resid;
|
|
} else {
|
|
bio->bi_io_vec[0].bv_len = len;
|
|
}
|
|
|
|
bio->bi_vcnt = vcnt;
|
|
bio->bi_size = len;
|
|
bio->bi_idx = 0;
|
|
|
|
return bio;
|
|
}
|
|
|
|
/*
|
|
* Clone a portion of a bio chain, starting at the given byte offset
|
|
* into the first bio in the source chain and continuing for the
|
|
* number of bytes indicated. The result is another bio chain of
|
|
* exactly the given length, or a null pointer on error.
|
|
*
|
|
* The bio_src and offset parameters are both in-out. On entry they
|
|
* refer to the first source bio and the offset into that bio where
|
|
* the start of data to be cloned is located.
|
|
*
|
|
* On return, bio_src is updated to refer to the bio in the source
|
|
* chain that contains first un-cloned byte, and *offset will
|
|
* contain the offset of that byte within that bio.
|
|
*/
|
|
static struct bio *bio_chain_clone_range(struct bio **bio_src,
|
|
unsigned int *offset,
|
|
unsigned int len,
|
|
gfp_t gfpmask)
|
|
{
|
|
struct bio *bi = *bio_src;
|
|
unsigned int off = *offset;
|
|
struct bio *chain = NULL;
|
|
struct bio **end;
|
|
|
|
/* Build up a chain of clone bios up to the limit */
|
|
|
|
if (!bi || off >= bi->bi_size || !len)
|
|
return NULL; /* Nothing to clone */
|
|
|
|
end = &chain;
|
|
while (len) {
|
|
unsigned int bi_size;
|
|
struct bio *bio;
|
|
|
|
if (!bi) {
|
|
rbd_warn(NULL, "bio_chain exhausted with %u left", len);
|
|
goto out_err; /* EINVAL; ran out of bio's */
|
|
}
|
|
bi_size = min_t(unsigned int, bi->bi_size - off, len);
|
|
bio = bio_clone_range(bi, off, bi_size, gfpmask);
|
|
if (!bio)
|
|
goto out_err; /* ENOMEM */
|
|
|
|
*end = bio;
|
|
end = &bio->bi_next;
|
|
|
|
off += bi_size;
|
|
if (off == bi->bi_size) {
|
|
bi = bi->bi_next;
|
|
off = 0;
|
|
}
|
|
len -= bi_size;
|
|
}
|
|
*bio_src = bi;
|
|
*offset = off;
|
|
|
|
return chain;
|
|
out_err:
|
|
bio_chain_put(chain);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* The default/initial value for all object request flags is 0. For
|
|
* each flag, once its value is set to 1 it is never reset to 0
|
|
* again.
|
|
*/
|
|
static void obj_request_img_data_set(struct rbd_obj_request *obj_request)
|
|
{
|
|
if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) {
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
rbd_warn(rbd_dev, "obj_request %p already marked img_data\n",
|
|
obj_request);
|
|
}
|
|
}
|
|
|
|
static bool obj_request_img_data_test(struct rbd_obj_request *obj_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0;
|
|
}
|
|
|
|
static void obj_request_done_set(struct rbd_obj_request *obj_request)
|
|
{
|
|
if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) {
|
|
struct rbd_device *rbd_dev = NULL;
|
|
|
|
if (obj_request_img_data_test(obj_request))
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
rbd_warn(rbd_dev, "obj_request %p already marked done\n",
|
|
obj_request);
|
|
}
|
|
}
|
|
|
|
static bool obj_request_done_test(struct rbd_obj_request *obj_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0;
|
|
}
|
|
|
|
/*
|
|
* This sets the KNOWN flag after (possibly) setting the EXISTS
|
|
* flag. The latter is set based on the "exists" value provided.
|
|
*
|
|
* Note that for our purposes once an object exists it never goes
|
|
* away again. It's possible that the response from two existence
|
|
* checks are separated by the creation of the target object, and
|
|
* the first ("doesn't exist") response arrives *after* the second
|
|
* ("does exist"). In that case we ignore the second one.
|
|
*/
|
|
static void obj_request_existence_set(struct rbd_obj_request *obj_request,
|
|
bool exists)
|
|
{
|
|
if (exists)
|
|
set_bit(OBJ_REQ_EXISTS, &obj_request->flags);
|
|
set_bit(OBJ_REQ_KNOWN, &obj_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static bool obj_request_known_test(struct rbd_obj_request *obj_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0;
|
|
}
|
|
|
|
static bool obj_request_exists_test(struct rbd_obj_request *obj_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0;
|
|
}
|
|
|
|
static void rbd_obj_request_get(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p (was %d)\n", __func__, obj_request,
|
|
atomic_read(&obj_request->kref.refcount));
|
|
kref_get(&obj_request->kref);
|
|
}
|
|
|
|
static void rbd_obj_request_destroy(struct kref *kref);
|
|
static void rbd_obj_request_put(struct rbd_obj_request *obj_request)
|
|
{
|
|
rbd_assert(obj_request != NULL);
|
|
dout("%s: obj %p (was %d)\n", __func__, obj_request,
|
|
atomic_read(&obj_request->kref.refcount));
|
|
kref_put(&obj_request->kref, rbd_obj_request_destroy);
|
|
}
|
|
|
|
static bool img_request_child_test(struct rbd_img_request *img_request);
|
|
static void rbd_parent_request_destroy(struct kref *kref);
|
|
static void rbd_img_request_destroy(struct kref *kref);
|
|
static void rbd_img_request_put(struct rbd_img_request *img_request)
|
|
{
|
|
rbd_assert(img_request != NULL);
|
|
dout("%s: img %p (was %d)\n", __func__, img_request,
|
|
atomic_read(&img_request->kref.refcount));
|
|
if (img_request_child_test(img_request))
|
|
kref_put(&img_request->kref, rbd_parent_request_destroy);
|
|
else
|
|
kref_put(&img_request->kref, rbd_img_request_destroy);
|
|
}
|
|
|
|
static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
rbd_assert(obj_request->img_request == NULL);
|
|
|
|
/* Image request now owns object's original reference */
|
|
obj_request->img_request = img_request;
|
|
obj_request->which = img_request->obj_request_count;
|
|
rbd_assert(!obj_request_img_data_test(obj_request));
|
|
obj_request_img_data_set(obj_request);
|
|
rbd_assert(obj_request->which != BAD_WHICH);
|
|
img_request->obj_request_count++;
|
|
list_add_tail(&obj_request->links, &img_request->obj_requests);
|
|
dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request,
|
|
obj_request->which);
|
|
}
|
|
|
|
static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
rbd_assert(obj_request->which != BAD_WHICH);
|
|
|
|
dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request,
|
|
obj_request->which);
|
|
list_del(&obj_request->links);
|
|
rbd_assert(img_request->obj_request_count > 0);
|
|
img_request->obj_request_count--;
|
|
rbd_assert(obj_request->which == img_request->obj_request_count);
|
|
obj_request->which = BAD_WHICH;
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
rbd_assert(obj_request->img_request == img_request);
|
|
obj_request->img_request = NULL;
|
|
obj_request->callback = NULL;
|
|
rbd_obj_request_put(obj_request);
|
|
}
|
|
|
|
static bool obj_request_type_valid(enum obj_request_type type)
|
|
{
|
|
switch (type) {
|
|
case OBJ_REQUEST_NODATA:
|
|
case OBJ_REQUEST_BIO:
|
|
case OBJ_REQUEST_PAGES:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int rbd_obj_request_submit(struct ceph_osd_client *osdc,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: osdc %p obj %p\n", __func__, osdc, obj_request);
|
|
|
|
return ceph_osdc_start_request(osdc, obj_request->osd_req, false);
|
|
}
|
|
|
|
static void rbd_img_request_complete(struct rbd_img_request *img_request)
|
|
{
|
|
|
|
dout("%s: img %p\n", __func__, img_request);
|
|
|
|
/*
|
|
* If no error occurred, compute the aggregate transfer
|
|
* count for the image request. We could instead use
|
|
* atomic64_cmpxchg() to update it as each object request
|
|
* completes; not clear which way is better off hand.
|
|
*/
|
|
if (!img_request->result) {
|
|
struct rbd_obj_request *obj_request;
|
|
u64 xferred = 0;
|
|
|
|
for_each_obj_request(img_request, obj_request)
|
|
xferred += obj_request->xferred;
|
|
img_request->xferred = xferred;
|
|
}
|
|
|
|
if (img_request->callback)
|
|
img_request->callback(img_request);
|
|
else
|
|
rbd_img_request_put(img_request);
|
|
}
|
|
|
|
/* Caller is responsible for rbd_obj_request_destroy(obj_request) */
|
|
|
|
static int rbd_obj_request_wait(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p\n", __func__, obj_request);
|
|
|
|
return wait_for_completion_interruptible(&obj_request->completion);
|
|
}
|
|
|
|
/*
|
|
* The default/initial value for all image request flags is 0. Each
|
|
* is conditionally set to 1 at image request initialization time
|
|
* and currently never change thereafter.
|
|
*/
|
|
static void img_request_write_set(struct rbd_img_request *img_request)
|
|
{
|
|
set_bit(IMG_REQ_WRITE, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static bool img_request_write_test(struct rbd_img_request *img_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0;
|
|
}
|
|
|
|
static void img_request_child_set(struct rbd_img_request *img_request)
|
|
{
|
|
set_bit(IMG_REQ_CHILD, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static void img_request_child_clear(struct rbd_img_request *img_request)
|
|
{
|
|
clear_bit(IMG_REQ_CHILD, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static bool img_request_child_test(struct rbd_img_request *img_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0;
|
|
}
|
|
|
|
static void img_request_layered_set(struct rbd_img_request *img_request)
|
|
{
|
|
set_bit(IMG_REQ_LAYERED, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static void img_request_layered_clear(struct rbd_img_request *img_request)
|
|
{
|
|
clear_bit(IMG_REQ_LAYERED, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static bool img_request_layered_test(struct rbd_img_request *img_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0;
|
|
}
|
|
|
|
static void
|
|
rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
u64 xferred = obj_request->xferred;
|
|
u64 length = obj_request->length;
|
|
|
|
dout("%s: obj %p img %p result %d %llu/%llu\n", __func__,
|
|
obj_request, obj_request->img_request, obj_request->result,
|
|
xferred, length);
|
|
/*
|
|
* ENOENT means a hole in the image. We zero-fill the entire
|
|
* length of the request. A short read also implies zero-fill
|
|
* to the end of the request. An error requires the whole
|
|
* length of the request to be reported finished with an error
|
|
* to the block layer. In each case we update the xferred
|
|
* count to indicate the whole request was satisfied.
|
|
*/
|
|
rbd_assert(obj_request->type != OBJ_REQUEST_NODATA);
|
|
if (obj_request->result == -ENOENT) {
|
|
if (obj_request->type == OBJ_REQUEST_BIO)
|
|
zero_bio_chain(obj_request->bio_list, 0);
|
|
else
|
|
zero_pages(obj_request->pages, 0, length);
|
|
obj_request->result = 0;
|
|
} else if (xferred < length && !obj_request->result) {
|
|
if (obj_request->type == OBJ_REQUEST_BIO)
|
|
zero_bio_chain(obj_request->bio_list, xferred);
|
|
else
|
|
zero_pages(obj_request->pages, xferred, length);
|
|
}
|
|
obj_request->xferred = length;
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
static void rbd_obj_request_complete(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p cb %p\n", __func__, obj_request,
|
|
obj_request->callback);
|
|
if (obj_request->callback)
|
|
obj_request->callback(obj_request);
|
|
else
|
|
complete_all(&obj_request->completion);
|
|
}
|
|
|
|
static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p\n", __func__, obj_request);
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
static void rbd_osd_read_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request = NULL;
|
|
struct rbd_device *rbd_dev = NULL;
|
|
bool layered = false;
|
|
|
|
if (obj_request_img_data_test(obj_request)) {
|
|
img_request = obj_request->img_request;
|
|
layered = img_request && img_request_layered_test(img_request);
|
|
rbd_dev = img_request->rbd_dev;
|
|
}
|
|
|
|
dout("%s: obj %p img %p result %d %llu/%llu\n", __func__,
|
|
obj_request, img_request, obj_request->result,
|
|
obj_request->xferred, obj_request->length);
|
|
if (layered && obj_request->result == -ENOENT &&
|
|
obj_request->img_offset < rbd_dev->parent_overlap)
|
|
rbd_img_parent_read(obj_request);
|
|
else if (img_request)
|
|
rbd_img_obj_request_read_callback(obj_request);
|
|
else
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
static void rbd_osd_write_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p result %d %llu\n", __func__, obj_request,
|
|
obj_request->result, obj_request->length);
|
|
/*
|
|
* There is no such thing as a successful short write. Set
|
|
* it to our originally-requested length.
|
|
*/
|
|
obj_request->xferred = obj_request->length;
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
/*
|
|
* For a simple stat call there's nothing to do. We'll do more if
|
|
* this is part of a write sequence for a layered image.
|
|
*/
|
|
static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: obj %p\n", __func__, obj_request);
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
static void rbd_osd_req_callback(struct ceph_osd_request *osd_req,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct rbd_obj_request *obj_request = osd_req->r_priv;
|
|
u16 opcode;
|
|
|
|
dout("%s: osd_req %p msg %p\n", __func__, osd_req, msg);
|
|
rbd_assert(osd_req == obj_request->osd_req);
|
|
if (obj_request_img_data_test(obj_request)) {
|
|
rbd_assert(obj_request->img_request);
|
|
rbd_assert(obj_request->which != BAD_WHICH);
|
|
} else {
|
|
rbd_assert(obj_request->which == BAD_WHICH);
|
|
}
|
|
|
|
if (osd_req->r_result < 0)
|
|
obj_request->result = osd_req->r_result;
|
|
|
|
BUG_ON(osd_req->r_num_ops > 2);
|
|
|
|
/*
|
|
* We support a 64-bit length, but ultimately it has to be
|
|
* passed to blk_end_request(), which takes an unsigned int.
|
|
*/
|
|
obj_request->xferred = osd_req->r_reply_op_len[0];
|
|
rbd_assert(obj_request->xferred < (u64)UINT_MAX);
|
|
opcode = osd_req->r_ops[0].op;
|
|
switch (opcode) {
|
|
case CEPH_OSD_OP_READ:
|
|
rbd_osd_read_callback(obj_request);
|
|
break;
|
|
case CEPH_OSD_OP_WRITE:
|
|
rbd_osd_write_callback(obj_request);
|
|
break;
|
|
case CEPH_OSD_OP_STAT:
|
|
rbd_osd_stat_callback(obj_request);
|
|
break;
|
|
case CEPH_OSD_OP_CALL:
|
|
case CEPH_OSD_OP_NOTIFY_ACK:
|
|
case CEPH_OSD_OP_WATCH:
|
|
rbd_osd_trivial_callback(obj_request);
|
|
break;
|
|
default:
|
|
rbd_warn(NULL, "%s: unsupported op %hu\n",
|
|
obj_request->object_name, (unsigned short) opcode);
|
|
break;
|
|
}
|
|
|
|
if (obj_request_done_test(obj_request))
|
|
rbd_obj_request_complete(obj_request);
|
|
}
|
|
|
|
static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request = obj_request->img_request;
|
|
struct ceph_osd_request *osd_req = obj_request->osd_req;
|
|
u64 snap_id;
|
|
|
|
rbd_assert(osd_req != NULL);
|
|
|
|
snap_id = img_request ? img_request->snap_id : CEPH_NOSNAP;
|
|
ceph_osdc_build_request(osd_req, obj_request->offset,
|
|
NULL, snap_id, NULL);
|
|
}
|
|
|
|
static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request = obj_request->img_request;
|
|
struct ceph_osd_request *osd_req = obj_request->osd_req;
|
|
struct ceph_snap_context *snapc;
|
|
struct timespec mtime = CURRENT_TIME;
|
|
|
|
rbd_assert(osd_req != NULL);
|
|
|
|
snapc = img_request ? img_request->snapc : NULL;
|
|
ceph_osdc_build_request(osd_req, obj_request->offset,
|
|
snapc, CEPH_NOSNAP, &mtime);
|
|
}
|
|
|
|
static struct ceph_osd_request *rbd_osd_req_create(
|
|
struct rbd_device *rbd_dev,
|
|
bool write_request,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
struct ceph_snap_context *snapc = NULL;
|
|
struct ceph_osd_client *osdc;
|
|
struct ceph_osd_request *osd_req;
|
|
|
|
if (obj_request_img_data_test(obj_request)) {
|
|
struct rbd_img_request *img_request = obj_request->img_request;
|
|
|
|
rbd_assert(write_request ==
|
|
img_request_write_test(img_request));
|
|
if (write_request)
|
|
snapc = img_request->snapc;
|
|
}
|
|
|
|
/* Allocate and initialize the request, for the single op */
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC);
|
|
if (!osd_req)
|
|
return NULL; /* ENOMEM */
|
|
|
|
if (write_request)
|
|
osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
|
|
else
|
|
osd_req->r_flags = CEPH_OSD_FLAG_READ;
|
|
|
|
osd_req->r_callback = rbd_osd_req_callback;
|
|
osd_req->r_priv = obj_request;
|
|
|
|
osd_req->r_oid_len = strlen(obj_request->object_name);
|
|
rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid));
|
|
memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len);
|
|
|
|
osd_req->r_file_layout = rbd_dev->layout; /* struct */
|
|
|
|
return osd_req;
|
|
}
|
|
|
|
/*
|
|
* Create a copyup osd request based on the information in the
|
|
* object request supplied. A copyup request has two osd ops,
|
|
* a copyup method call, and a "normal" write request.
|
|
*/
|
|
static struct ceph_osd_request *
|
|
rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
struct ceph_snap_context *snapc;
|
|
struct rbd_device *rbd_dev;
|
|
struct ceph_osd_client *osdc;
|
|
struct ceph_osd_request *osd_req;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
img_request = obj_request->img_request;
|
|
rbd_assert(img_request);
|
|
rbd_assert(img_request_write_test(img_request));
|
|
|
|
/* Allocate and initialize the request, for the two ops */
|
|
|
|
snapc = img_request->snapc;
|
|
rbd_dev = img_request->rbd_dev;
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
osd_req = ceph_osdc_alloc_request(osdc, snapc, 2, false, GFP_ATOMIC);
|
|
if (!osd_req)
|
|
return NULL; /* ENOMEM */
|
|
|
|
osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK;
|
|
osd_req->r_callback = rbd_osd_req_callback;
|
|
osd_req->r_priv = obj_request;
|
|
|
|
osd_req->r_oid_len = strlen(obj_request->object_name);
|
|
rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid));
|
|
memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len);
|
|
|
|
osd_req->r_file_layout = rbd_dev->layout; /* struct */
|
|
|
|
return osd_req;
|
|
}
|
|
|
|
|
|
static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req)
|
|
{
|
|
ceph_osdc_put_request(osd_req);
|
|
}
|
|
|
|
/* object_name is assumed to be a non-null pointer and NUL-terminated */
|
|
|
|
static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
|
|
u64 offset, u64 length,
|
|
enum obj_request_type type)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
size_t size;
|
|
char *name;
|
|
|
|
rbd_assert(obj_request_type_valid(type));
|
|
|
|
size = strlen(object_name) + 1;
|
|
name = kmalloc(size, GFP_KERNEL);
|
|
if (!name)
|
|
return NULL;
|
|
|
|
obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL);
|
|
if (!obj_request) {
|
|
kfree(name);
|
|
return NULL;
|
|
}
|
|
|
|
obj_request->object_name = memcpy(name, object_name, size);
|
|
obj_request->offset = offset;
|
|
obj_request->length = length;
|
|
obj_request->flags = 0;
|
|
obj_request->which = BAD_WHICH;
|
|
obj_request->type = type;
|
|
INIT_LIST_HEAD(&obj_request->links);
|
|
init_completion(&obj_request->completion);
|
|
kref_init(&obj_request->kref);
|
|
|
|
dout("%s: \"%s\" %llu/%llu %d -> obj %p\n", __func__, object_name,
|
|
offset, length, (int)type, obj_request);
|
|
|
|
return obj_request;
|
|
}
|
|
|
|
static void rbd_obj_request_destroy(struct kref *kref)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
|
|
obj_request = container_of(kref, struct rbd_obj_request, kref);
|
|
|
|
dout("%s: obj %p\n", __func__, obj_request);
|
|
|
|
rbd_assert(obj_request->img_request == NULL);
|
|
rbd_assert(obj_request->which == BAD_WHICH);
|
|
|
|
if (obj_request->osd_req)
|
|
rbd_osd_req_destroy(obj_request->osd_req);
|
|
|
|
rbd_assert(obj_request_type_valid(obj_request->type));
|
|
switch (obj_request->type) {
|
|
case OBJ_REQUEST_NODATA:
|
|
break; /* Nothing to do */
|
|
case OBJ_REQUEST_BIO:
|
|
if (obj_request->bio_list)
|
|
bio_chain_put(obj_request->bio_list);
|
|
break;
|
|
case OBJ_REQUEST_PAGES:
|
|
if (obj_request->pages)
|
|
ceph_release_page_vector(obj_request->pages,
|
|
obj_request->page_count);
|
|
break;
|
|
}
|
|
|
|
kfree(obj_request->object_name);
|
|
obj_request->object_name = NULL;
|
|
kmem_cache_free(rbd_obj_request_cache, obj_request);
|
|
}
|
|
|
|
/* It's OK to call this for a device with no parent */
|
|
|
|
static void rbd_spec_put(struct rbd_spec *spec);
|
|
static void rbd_dev_unparent(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev_remove_parent(rbd_dev);
|
|
rbd_spec_put(rbd_dev->parent_spec);
|
|
rbd_dev->parent_spec = NULL;
|
|
rbd_dev->parent_overlap = 0;
|
|
}
|
|
|
|
/*
|
|
* Parent image reference counting is used to determine when an
|
|
* image's parent fields can be safely torn down--after there are no
|
|
* more in-flight requests to the parent image. When the last
|
|
* reference is dropped, cleaning them up is safe.
|
|
*/
|
|
static void rbd_dev_parent_put(struct rbd_device *rbd_dev)
|
|
{
|
|
int counter;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return;
|
|
|
|
counter = atomic_dec_return_safe(&rbd_dev->parent_ref);
|
|
if (counter > 0)
|
|
return;
|
|
|
|
/* Last reference; clean up parent data structures */
|
|
|
|
if (!counter)
|
|
rbd_dev_unparent(rbd_dev);
|
|
else
|
|
rbd_warn(rbd_dev, "parent reference underflow\n");
|
|
}
|
|
|
|
/*
|
|
* If an image has a non-zero parent overlap, get a reference to its
|
|
* parent.
|
|
*
|
|
* We must get the reference before checking for the overlap to
|
|
* coordinate properly with zeroing the parent overlap in
|
|
* rbd_dev_v2_parent_info() when an image gets flattened. We
|
|
* drop it again if there is no overlap.
|
|
*
|
|
* Returns true if the rbd device has a parent with a non-zero
|
|
* overlap and a reference for it was successfully taken, or
|
|
* false otherwise.
|
|
*/
|
|
static bool rbd_dev_parent_get(struct rbd_device *rbd_dev)
|
|
{
|
|
int counter;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return false;
|
|
|
|
counter = atomic_inc_return_safe(&rbd_dev->parent_ref);
|
|
if (counter > 0 && rbd_dev->parent_overlap)
|
|
return true;
|
|
|
|
/* Image was flattened, but parent is not yet torn down */
|
|
|
|
if (counter < 0)
|
|
rbd_warn(rbd_dev, "parent reference overflow\n");
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Caller is responsible for filling in the list of object requests
|
|
* that comprises the image request, and the Linux request pointer
|
|
* (if there is one).
|
|
*/
|
|
static struct rbd_img_request *rbd_img_request_create(
|
|
struct rbd_device *rbd_dev,
|
|
u64 offset, u64 length,
|
|
bool write_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
|
|
img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_ATOMIC);
|
|
if (!img_request)
|
|
return NULL;
|
|
|
|
if (write_request) {
|
|
down_read(&rbd_dev->header_rwsem);
|
|
ceph_get_snap_context(rbd_dev->header.snapc);
|
|
up_read(&rbd_dev->header_rwsem);
|
|
}
|
|
|
|
img_request->rq = NULL;
|
|
img_request->rbd_dev = rbd_dev;
|
|
img_request->offset = offset;
|
|
img_request->length = length;
|
|
img_request->flags = 0;
|
|
if (write_request) {
|
|
img_request_write_set(img_request);
|
|
img_request->snapc = rbd_dev->header.snapc;
|
|
} else {
|
|
img_request->snap_id = rbd_dev->spec->snap_id;
|
|
}
|
|
if (rbd_dev_parent_get(rbd_dev))
|
|
img_request_layered_set(img_request);
|
|
spin_lock_init(&img_request->completion_lock);
|
|
img_request->next_completion = 0;
|
|
img_request->callback = NULL;
|
|
img_request->result = 0;
|
|
img_request->obj_request_count = 0;
|
|
INIT_LIST_HEAD(&img_request->obj_requests);
|
|
kref_init(&img_request->kref);
|
|
|
|
dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev,
|
|
write_request ? "write" : "read", offset, length,
|
|
img_request);
|
|
|
|
return img_request;
|
|
}
|
|
|
|
static void rbd_img_request_destroy(struct kref *kref)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
struct rbd_obj_request *obj_request;
|
|
struct rbd_obj_request *next_obj_request;
|
|
|
|
img_request = container_of(kref, struct rbd_img_request, kref);
|
|
|
|
dout("%s: img %p\n", __func__, img_request);
|
|
|
|
for_each_obj_request_safe(img_request, obj_request, next_obj_request)
|
|
rbd_img_obj_request_del(img_request, obj_request);
|
|
rbd_assert(img_request->obj_request_count == 0);
|
|
|
|
if (img_request_layered_test(img_request)) {
|
|
img_request_layered_clear(img_request);
|
|
rbd_dev_parent_put(img_request->rbd_dev);
|
|
}
|
|
|
|
if (img_request_write_test(img_request))
|
|
ceph_put_snap_context(img_request->snapc);
|
|
|
|
kmem_cache_free(rbd_img_request_cache, img_request);
|
|
}
|
|
|
|
static struct rbd_img_request *rbd_parent_request_create(
|
|
struct rbd_obj_request *obj_request,
|
|
u64 img_offset, u64 length)
|
|
{
|
|
struct rbd_img_request *parent_request;
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_assert(obj_request->img_request);
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
|
|
parent_request = rbd_img_request_create(rbd_dev->parent,
|
|
img_offset, length, false);
|
|
if (!parent_request)
|
|
return NULL;
|
|
|
|
img_request_child_set(parent_request);
|
|
rbd_obj_request_get(obj_request);
|
|
parent_request->obj_request = obj_request;
|
|
|
|
return parent_request;
|
|
}
|
|
|
|
static void rbd_parent_request_destroy(struct kref *kref)
|
|
{
|
|
struct rbd_img_request *parent_request;
|
|
struct rbd_obj_request *orig_request;
|
|
|
|
parent_request = container_of(kref, struct rbd_img_request, kref);
|
|
orig_request = parent_request->obj_request;
|
|
|
|
parent_request->obj_request = NULL;
|
|
rbd_obj_request_put(orig_request);
|
|
img_request_child_clear(parent_request);
|
|
|
|
rbd_img_request_destroy(kref);
|
|
}
|
|
|
|
static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
unsigned int xferred;
|
|
int result;
|
|
bool more;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
img_request = obj_request->img_request;
|
|
|
|
rbd_assert(obj_request->xferred <= (u64)UINT_MAX);
|
|
xferred = (unsigned int)obj_request->xferred;
|
|
result = obj_request->result;
|
|
if (result) {
|
|
struct rbd_device *rbd_dev = img_request->rbd_dev;
|
|
|
|
rbd_warn(rbd_dev, "%s %llx at %llx (%llx)\n",
|
|
img_request_write_test(img_request) ? "write" : "read",
|
|
obj_request->length, obj_request->img_offset,
|
|
obj_request->offset);
|
|
rbd_warn(rbd_dev, " result %d xferred %x\n",
|
|
result, xferred);
|
|
if (!img_request->result)
|
|
img_request->result = result;
|
|
}
|
|
|
|
/* Image object requests don't own their page array */
|
|
|
|
if (obj_request->type == OBJ_REQUEST_PAGES) {
|
|
obj_request->pages = NULL;
|
|
obj_request->page_count = 0;
|
|
}
|
|
|
|
if (img_request_child_test(img_request)) {
|
|
rbd_assert(img_request->obj_request != NULL);
|
|
more = obj_request->which < img_request->obj_request_count - 1;
|
|
} else {
|
|
rbd_assert(img_request->rq != NULL);
|
|
more = blk_end_request(img_request->rq, result, xferred);
|
|
}
|
|
|
|
return more;
|
|
}
|
|
|
|
static void rbd_img_obj_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
u32 which = obj_request->which;
|
|
bool more = true;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
img_request = obj_request->img_request;
|
|
|
|
dout("%s: img %p obj %p\n", __func__, img_request, obj_request);
|
|
rbd_assert(img_request != NULL);
|
|
rbd_assert(img_request->obj_request_count > 0);
|
|
rbd_assert(which != BAD_WHICH);
|
|
rbd_assert(which < img_request->obj_request_count);
|
|
rbd_assert(which >= img_request->next_completion);
|
|
|
|
spin_lock_irq(&img_request->completion_lock);
|
|
if (which != img_request->next_completion)
|
|
goto out;
|
|
|
|
for_each_obj_request_from(img_request, obj_request) {
|
|
rbd_assert(more);
|
|
rbd_assert(which < img_request->obj_request_count);
|
|
|
|
if (!obj_request_done_test(obj_request))
|
|
break;
|
|
more = rbd_img_obj_end_request(obj_request);
|
|
which++;
|
|
}
|
|
|
|
rbd_assert(more ^ (which == img_request->obj_request_count));
|
|
img_request->next_completion = which;
|
|
out:
|
|
spin_unlock_irq(&img_request->completion_lock);
|
|
|
|
if (!more)
|
|
rbd_img_request_complete(img_request);
|
|
}
|
|
|
|
/*
|
|
* Split up an image request into one or more object requests, each
|
|
* to a different object. The "type" parameter indicates whether
|
|
* "data_desc" is the pointer to the head of a list of bio
|
|
* structures, or the base of a page array. In either case this
|
|
* function assumes data_desc describes memory sufficient to hold
|
|
* all data described by the image request.
|
|
*/
|
|
static int rbd_img_request_fill(struct rbd_img_request *img_request,
|
|
enum obj_request_type type,
|
|
void *data_desc)
|
|
{
|
|
struct rbd_device *rbd_dev = img_request->rbd_dev;
|
|
struct rbd_obj_request *obj_request = NULL;
|
|
struct rbd_obj_request *next_obj_request;
|
|
bool write_request = img_request_write_test(img_request);
|
|
struct bio *bio_list = NULL;
|
|
unsigned int bio_offset = 0;
|
|
struct page **pages = NULL;
|
|
u64 img_offset;
|
|
u64 resid;
|
|
u16 opcode;
|
|
|
|
dout("%s: img %p type %d data_desc %p\n", __func__, img_request,
|
|
(int)type, data_desc);
|
|
|
|
opcode = write_request ? CEPH_OSD_OP_WRITE : CEPH_OSD_OP_READ;
|
|
img_offset = img_request->offset;
|
|
resid = img_request->length;
|
|
rbd_assert(resid > 0);
|
|
|
|
if (type == OBJ_REQUEST_BIO) {
|
|
bio_list = data_desc;
|
|
rbd_assert(img_offset == bio_list->bi_sector << SECTOR_SHIFT);
|
|
} else {
|
|
rbd_assert(type == OBJ_REQUEST_PAGES);
|
|
pages = data_desc;
|
|
}
|
|
|
|
while (resid) {
|
|
struct ceph_osd_request *osd_req;
|
|
const char *object_name;
|
|
u64 offset;
|
|
u64 length;
|
|
|
|
object_name = rbd_segment_name(rbd_dev, img_offset);
|
|
if (!object_name)
|
|
goto out_unwind;
|
|
offset = rbd_segment_offset(rbd_dev, img_offset);
|
|
length = rbd_segment_length(rbd_dev, img_offset, resid);
|
|
obj_request = rbd_obj_request_create(object_name,
|
|
offset, length, type);
|
|
/* object request has its own copy of the object name */
|
|
rbd_segment_name_free(object_name);
|
|
if (!obj_request)
|
|
goto out_unwind;
|
|
/*
|
|
* set obj_request->img_request before creating the
|
|
* osd_request so that it gets the right snapc
|
|
*/
|
|
rbd_img_obj_request_add(img_request, obj_request);
|
|
|
|
if (type == OBJ_REQUEST_BIO) {
|
|
unsigned int clone_size;
|
|
|
|
rbd_assert(length <= (u64)UINT_MAX);
|
|
clone_size = (unsigned int)length;
|
|
obj_request->bio_list =
|
|
bio_chain_clone_range(&bio_list,
|
|
&bio_offset,
|
|
clone_size,
|
|
GFP_ATOMIC);
|
|
if (!obj_request->bio_list)
|
|
goto out_partial;
|
|
} else {
|
|
unsigned int page_count;
|
|
|
|
obj_request->pages = pages;
|
|
page_count = (u32)calc_pages_for(offset, length);
|
|
obj_request->page_count = page_count;
|
|
if ((offset + length) & ~PAGE_MASK)
|
|
page_count--; /* more on last page */
|
|
pages += page_count;
|
|
}
|
|
|
|
osd_req = rbd_osd_req_create(rbd_dev, write_request,
|
|
obj_request);
|
|
if (!osd_req)
|
|
goto out_partial;
|
|
obj_request->osd_req = osd_req;
|
|
obj_request->callback = rbd_img_obj_callback;
|
|
|
|
osd_req_op_extent_init(osd_req, 0, opcode, offset, length,
|
|
0, 0);
|
|
if (type == OBJ_REQUEST_BIO)
|
|
osd_req_op_extent_osd_data_bio(osd_req, 0,
|
|
obj_request->bio_list, length);
|
|
else
|
|
osd_req_op_extent_osd_data_pages(osd_req, 0,
|
|
obj_request->pages, length,
|
|
offset & ~PAGE_MASK, false, false);
|
|
|
|
if (write_request)
|
|
rbd_osd_req_format_write(obj_request);
|
|
else
|
|
rbd_osd_req_format_read(obj_request);
|
|
|
|
obj_request->img_offset = img_offset;
|
|
|
|
img_offset += length;
|
|
resid -= length;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_partial:
|
|
rbd_obj_request_put(obj_request);
|
|
out_unwind:
|
|
for_each_obj_request_safe(img_request, obj_request, next_obj_request)
|
|
rbd_obj_request_put(obj_request);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void
|
|
rbd_img_obj_copyup_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
struct rbd_device *rbd_dev;
|
|
struct page **pages;
|
|
u32 page_count;
|
|
|
|
rbd_assert(obj_request->type == OBJ_REQUEST_BIO);
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
img_request = obj_request->img_request;
|
|
rbd_assert(img_request);
|
|
|
|
rbd_dev = img_request->rbd_dev;
|
|
rbd_assert(rbd_dev);
|
|
|
|
pages = obj_request->copyup_pages;
|
|
rbd_assert(pages != NULL);
|
|
obj_request->copyup_pages = NULL;
|
|
page_count = obj_request->copyup_page_count;
|
|
rbd_assert(page_count);
|
|
obj_request->copyup_page_count = 0;
|
|
ceph_release_page_vector(pages, page_count);
|
|
|
|
/*
|
|
* We want the transfer count to reflect the size of the
|
|
* original write request. There is no such thing as a
|
|
* successful short write, so if the request was successful
|
|
* we can just set it to the originally-requested length.
|
|
*/
|
|
if (!obj_request->result)
|
|
obj_request->xferred = obj_request->length;
|
|
|
|
/* Finish up with the normal image object callback */
|
|
|
|
rbd_img_obj_callback(obj_request);
|
|
}
|
|
|
|
static void
|
|
rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request)
|
|
{
|
|
struct rbd_obj_request *orig_request;
|
|
struct ceph_osd_request *osd_req;
|
|
struct ceph_osd_client *osdc;
|
|
struct rbd_device *rbd_dev;
|
|
struct page **pages;
|
|
u32 page_count;
|
|
int img_result;
|
|
u64 parent_length;
|
|
u64 offset;
|
|
u64 length;
|
|
|
|
rbd_assert(img_request_child_test(img_request));
|
|
|
|
/* First get what we need from the image request */
|
|
|
|
pages = img_request->copyup_pages;
|
|
rbd_assert(pages != NULL);
|
|
img_request->copyup_pages = NULL;
|
|
page_count = img_request->copyup_page_count;
|
|
rbd_assert(page_count);
|
|
img_request->copyup_page_count = 0;
|
|
|
|
orig_request = img_request->obj_request;
|
|
rbd_assert(orig_request != NULL);
|
|
rbd_assert(obj_request_type_valid(orig_request->type));
|
|
img_result = img_request->result;
|
|
parent_length = img_request->length;
|
|
rbd_assert(parent_length == img_request->xferred);
|
|
rbd_img_request_put(img_request);
|
|
|
|
rbd_assert(orig_request->img_request);
|
|
rbd_dev = orig_request->img_request->rbd_dev;
|
|
rbd_assert(rbd_dev);
|
|
|
|
/*
|
|
* If the overlap has become 0 (most likely because the
|
|
* image has been flattened) we need to free the pages
|
|
* and re-submit the original write request.
|
|
*/
|
|
if (!rbd_dev->parent_overlap) {
|
|
struct ceph_osd_client *osdc;
|
|
|
|
ceph_release_page_vector(pages, page_count);
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
img_result = rbd_obj_request_submit(osdc, orig_request);
|
|
if (!img_result)
|
|
return;
|
|
}
|
|
|
|
if (img_result)
|
|
goto out_err;
|
|
|
|
/*
|
|
* The original osd request is of no use to use any more.
|
|
* We need a new one that can hold the two ops in a copyup
|
|
* request. Allocate the new copyup osd request for the
|
|
* original request, and release the old one.
|
|
*/
|
|
img_result = -ENOMEM;
|
|
osd_req = rbd_osd_req_create_copyup(orig_request);
|
|
if (!osd_req)
|
|
goto out_err;
|
|
rbd_osd_req_destroy(orig_request->osd_req);
|
|
orig_request->osd_req = osd_req;
|
|
orig_request->copyup_pages = pages;
|
|
orig_request->copyup_page_count = page_count;
|
|
|
|
/* Initialize the copyup op */
|
|
|
|
osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup");
|
|
osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0,
|
|
false, false);
|
|
|
|
/* Then the original write request op */
|
|
|
|
offset = orig_request->offset;
|
|
length = orig_request->length;
|
|
osd_req_op_extent_init(osd_req, 1, CEPH_OSD_OP_WRITE,
|
|
offset, length, 0, 0);
|
|
if (orig_request->type == OBJ_REQUEST_BIO)
|
|
osd_req_op_extent_osd_data_bio(osd_req, 1,
|
|
orig_request->bio_list, length);
|
|
else
|
|
osd_req_op_extent_osd_data_pages(osd_req, 1,
|
|
orig_request->pages, length,
|
|
offset & ~PAGE_MASK, false, false);
|
|
|
|
rbd_osd_req_format_write(orig_request);
|
|
|
|
/* All set, send it off. */
|
|
|
|
orig_request->callback = rbd_img_obj_copyup_callback;
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
img_result = rbd_obj_request_submit(osdc, orig_request);
|
|
if (!img_result)
|
|
return;
|
|
out_err:
|
|
/* Record the error code and complete the request */
|
|
|
|
orig_request->result = img_result;
|
|
orig_request->xferred = 0;
|
|
obj_request_done_set(orig_request);
|
|
rbd_obj_request_complete(orig_request);
|
|
}
|
|
|
|
/*
|
|
* Read from the parent image the range of data that covers the
|
|
* entire target of the given object request. This is used for
|
|
* satisfying a layered image write request when the target of an
|
|
* object request from the image request does not exist.
|
|
*
|
|
* A page array big enough to hold the returned data is allocated
|
|
* and supplied to rbd_img_request_fill() as the "data descriptor."
|
|
* When the read completes, this page array will be transferred to
|
|
* the original object request for the copyup operation.
|
|
*
|
|
* If an error occurs, record it as the result of the original
|
|
* object request and mark it done so it gets completed.
|
|
*/
|
|
static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request = NULL;
|
|
struct rbd_img_request *parent_request = NULL;
|
|
struct rbd_device *rbd_dev;
|
|
u64 img_offset;
|
|
u64 length;
|
|
struct page **pages = NULL;
|
|
u32 page_count;
|
|
int result;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
rbd_assert(obj_request_type_valid(obj_request->type));
|
|
|
|
img_request = obj_request->img_request;
|
|
rbd_assert(img_request != NULL);
|
|
rbd_dev = img_request->rbd_dev;
|
|
rbd_assert(rbd_dev->parent != NULL);
|
|
|
|
/*
|
|
* Determine the byte range covered by the object in the
|
|
* child image to which the original request was to be sent.
|
|
*/
|
|
img_offset = obj_request->img_offset - obj_request->offset;
|
|
length = (u64)1 << rbd_dev->header.obj_order;
|
|
|
|
/*
|
|
* There is no defined parent data beyond the parent
|
|
* overlap, so limit what we read at that boundary if
|
|
* necessary.
|
|
*/
|
|
if (img_offset + length > rbd_dev->parent_overlap) {
|
|
rbd_assert(img_offset < rbd_dev->parent_overlap);
|
|
length = rbd_dev->parent_overlap - img_offset;
|
|
}
|
|
|
|
/*
|
|
* Allocate a page array big enough to receive the data read
|
|
* from the parent.
|
|
*/
|
|
page_count = (u32)calc_pages_for(0, length);
|
|
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
|
|
if (IS_ERR(pages)) {
|
|
result = PTR_ERR(pages);
|
|
pages = NULL;
|
|
goto out_err;
|
|
}
|
|
|
|
result = -ENOMEM;
|
|
parent_request = rbd_parent_request_create(obj_request,
|
|
img_offset, length);
|
|
if (!parent_request)
|
|
goto out_err;
|
|
|
|
result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages);
|
|
if (result)
|
|
goto out_err;
|
|
parent_request->copyup_pages = pages;
|
|
parent_request->copyup_page_count = page_count;
|
|
|
|
parent_request->callback = rbd_img_obj_parent_read_full_callback;
|
|
result = rbd_img_request_submit(parent_request);
|
|
if (!result)
|
|
return 0;
|
|
|
|
parent_request->copyup_pages = NULL;
|
|
parent_request->copyup_page_count = 0;
|
|
parent_request->obj_request = NULL;
|
|
rbd_obj_request_put(obj_request);
|
|
out_err:
|
|
if (pages)
|
|
ceph_release_page_vector(pages, page_count);
|
|
if (parent_request)
|
|
rbd_img_request_put(parent_request);
|
|
obj_request->result = result;
|
|
obj_request->xferred = 0;
|
|
obj_request_done_set(obj_request);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_obj_request *orig_request;
|
|
struct rbd_device *rbd_dev;
|
|
int result;
|
|
|
|
rbd_assert(!obj_request_img_data_test(obj_request));
|
|
|
|
/*
|
|
* All we need from the object request is the original
|
|
* request and the result of the STAT op. Grab those, then
|
|
* we're done with the request.
|
|
*/
|
|
orig_request = obj_request->obj_request;
|
|
obj_request->obj_request = NULL;
|
|
rbd_obj_request_put(orig_request);
|
|
rbd_assert(orig_request);
|
|
rbd_assert(orig_request->img_request);
|
|
|
|
result = obj_request->result;
|
|
obj_request->result = 0;
|
|
|
|
dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__,
|
|
obj_request, orig_request, result,
|
|
obj_request->xferred, obj_request->length);
|
|
rbd_obj_request_put(obj_request);
|
|
|
|
/*
|
|
* If the overlap has become 0 (most likely because the
|
|
* image has been flattened) we need to free the pages
|
|
* and re-submit the original write request.
|
|
*/
|
|
rbd_dev = orig_request->img_request->rbd_dev;
|
|
if (!rbd_dev->parent_overlap) {
|
|
struct ceph_osd_client *osdc;
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
result = rbd_obj_request_submit(osdc, orig_request);
|
|
if (!result)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Our only purpose here is to determine whether the object
|
|
* exists, and we don't want to treat the non-existence as
|
|
* an error. If something else comes back, transfer the
|
|
* error to the original request and complete it now.
|
|
*/
|
|
if (!result) {
|
|
obj_request_existence_set(orig_request, true);
|
|
} else if (result == -ENOENT) {
|
|
obj_request_existence_set(orig_request, false);
|
|
} else if (result) {
|
|
orig_request->result = result;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Resubmit the original request now that we have recorded
|
|
* whether the target object exists.
|
|
*/
|
|
orig_request->result = rbd_img_obj_request_submit(orig_request);
|
|
out:
|
|
if (orig_request->result)
|
|
rbd_obj_request_complete(orig_request);
|
|
}
|
|
|
|
static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_obj_request *stat_request;
|
|
struct rbd_device *rbd_dev;
|
|
struct ceph_osd_client *osdc;
|
|
struct page **pages = NULL;
|
|
u32 page_count;
|
|
size_t size;
|
|
int ret;
|
|
|
|
/*
|
|
* The response data for a STAT call consists of:
|
|
* le64 length;
|
|
* struct {
|
|
* le32 tv_sec;
|
|
* le32 tv_nsec;
|
|
* } mtime;
|
|
*/
|
|
size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32);
|
|
page_count = (u32)calc_pages_for(0, size);
|
|
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
|
|
if (IS_ERR(pages))
|
|
return PTR_ERR(pages);
|
|
|
|
ret = -ENOMEM;
|
|
stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0,
|
|
OBJ_REQUEST_PAGES);
|
|
if (!stat_request)
|
|
goto out;
|
|
|
|
rbd_obj_request_get(obj_request);
|
|
stat_request->obj_request = obj_request;
|
|
stat_request->pages = pages;
|
|
stat_request->page_count = page_count;
|
|
|
|
rbd_assert(obj_request->img_request);
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
stat_request->osd_req = rbd_osd_req_create(rbd_dev, false,
|
|
stat_request);
|
|
if (!stat_request->osd_req)
|
|
goto out;
|
|
stat_request->callback = rbd_img_obj_exists_callback;
|
|
|
|
osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT);
|
|
osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0,
|
|
false, false);
|
|
rbd_osd_req_format_read(stat_request);
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
ret = rbd_obj_request_submit(osdc, stat_request);
|
|
out:
|
|
if (ret)
|
|
rbd_obj_request_put(obj_request);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
struct rbd_device *rbd_dev;
|
|
bool known;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
|
|
img_request = obj_request->img_request;
|
|
rbd_assert(img_request);
|
|
rbd_dev = img_request->rbd_dev;
|
|
|
|
/*
|
|
* Only writes to layered images need special handling.
|
|
* Reads and non-layered writes are simple object requests.
|
|
* Layered writes that start beyond the end of the overlap
|
|
* with the parent have no parent data, so they too are
|
|
* simple object requests. Finally, if the target object is
|
|
* known to already exist, its parent data has already been
|
|
* copied, so a write to the object can also be handled as a
|
|
* simple object request.
|
|
*/
|
|
if (!img_request_write_test(img_request) ||
|
|
!img_request_layered_test(img_request) ||
|
|
rbd_dev->parent_overlap <= obj_request->img_offset ||
|
|
((known = obj_request_known_test(obj_request)) &&
|
|
obj_request_exists_test(obj_request))) {
|
|
|
|
struct rbd_device *rbd_dev;
|
|
struct ceph_osd_client *osdc;
|
|
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
|
|
return rbd_obj_request_submit(osdc, obj_request);
|
|
}
|
|
|
|
/*
|
|
* It's a layered write. The target object might exist but
|
|
* we may not know that yet. If we know it doesn't exist,
|
|
* start by reading the data for the full target object from
|
|
* the parent so we can use it for a copyup to the target.
|
|
*/
|
|
if (known)
|
|
return rbd_img_obj_parent_read_full(obj_request);
|
|
|
|
/* We don't know whether the target exists. Go find out. */
|
|
|
|
return rbd_img_obj_exists_submit(obj_request);
|
|
}
|
|
|
|
static int rbd_img_request_submit(struct rbd_img_request *img_request)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
struct rbd_obj_request *next_obj_request;
|
|
|
|
dout("%s: img %p\n", __func__, img_request);
|
|
for_each_obj_request_safe(img_request, obj_request, next_obj_request) {
|
|
int ret;
|
|
|
|
ret = rbd_img_obj_request_submit(obj_request);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_img_parent_read_callback(struct rbd_img_request *img_request)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
struct rbd_device *rbd_dev;
|
|
u64 obj_end;
|
|
u64 img_xferred;
|
|
int img_result;
|
|
|
|
rbd_assert(img_request_child_test(img_request));
|
|
|
|
/* First get what we need from the image request and release it */
|
|
|
|
obj_request = img_request->obj_request;
|
|
img_xferred = img_request->xferred;
|
|
img_result = img_request->result;
|
|
rbd_img_request_put(img_request);
|
|
|
|
/*
|
|
* If the overlap has become 0 (most likely because the
|
|
* image has been flattened) we need to re-submit the
|
|
* original request.
|
|
*/
|
|
rbd_assert(obj_request);
|
|
rbd_assert(obj_request->img_request);
|
|
rbd_dev = obj_request->img_request->rbd_dev;
|
|
if (!rbd_dev->parent_overlap) {
|
|
struct ceph_osd_client *osdc;
|
|
|
|
osdc = &rbd_dev->rbd_client->client->osdc;
|
|
img_result = rbd_obj_request_submit(osdc, obj_request);
|
|
if (!img_result)
|
|
return;
|
|
}
|
|
|
|
obj_request->result = img_result;
|
|
if (obj_request->result)
|
|
goto out;
|
|
|
|
/*
|
|
* We need to zero anything beyond the parent overlap
|
|
* boundary. Since rbd_img_obj_request_read_callback()
|
|
* will zero anything beyond the end of a short read, an
|
|
* easy way to do this is to pretend the data from the
|
|
* parent came up short--ending at the overlap boundary.
|
|
*/
|
|
rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length);
|
|
obj_end = obj_request->img_offset + obj_request->length;
|
|
if (obj_end > rbd_dev->parent_overlap) {
|
|
u64 xferred = 0;
|
|
|
|
if (obj_request->img_offset < rbd_dev->parent_overlap)
|
|
xferred = rbd_dev->parent_overlap -
|
|
obj_request->img_offset;
|
|
|
|
obj_request->xferred = min(img_xferred, xferred);
|
|
} else {
|
|
obj_request->xferred = img_xferred;
|
|
}
|
|
out:
|
|
rbd_img_obj_request_read_callback(obj_request);
|
|
rbd_obj_request_complete(obj_request);
|
|
}
|
|
|
|
static void rbd_img_parent_read(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
int result;
|
|
|
|
rbd_assert(obj_request_img_data_test(obj_request));
|
|
rbd_assert(obj_request->img_request != NULL);
|
|
rbd_assert(obj_request->result == (s32) -ENOENT);
|
|
rbd_assert(obj_request_type_valid(obj_request->type));
|
|
|
|
/* rbd_read_finish(obj_request, obj_request->length); */
|
|
img_request = rbd_parent_request_create(obj_request,
|
|
obj_request->img_offset,
|
|
obj_request->length);
|
|
result = -ENOMEM;
|
|
if (!img_request)
|
|
goto out_err;
|
|
|
|
if (obj_request->type == OBJ_REQUEST_BIO)
|
|
result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
|
|
obj_request->bio_list);
|
|
else
|
|
result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES,
|
|
obj_request->pages);
|
|
if (result)
|
|
goto out_err;
|
|
|
|
img_request->callback = rbd_img_parent_read_callback;
|
|
result = rbd_img_request_submit(img_request);
|
|
if (result)
|
|
goto out_err;
|
|
|
|
return;
|
|
out_err:
|
|
if (img_request)
|
|
rbd_img_request_put(img_request);
|
|
obj_request->result = result;
|
|
obj_request->xferred = 0;
|
|
obj_request_done_set(obj_request);
|
|
}
|
|
|
|
static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, u64 notify_id)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
int ret;
|
|
|
|
obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
|
|
OBJ_REQUEST_NODATA);
|
|
if (!obj_request)
|
|
return -ENOMEM;
|
|
|
|
ret = -ENOMEM;
|
|
obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request);
|
|
if (!obj_request->osd_req)
|
|
goto out;
|
|
obj_request->callback = rbd_obj_request_put;
|
|
|
|
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_NOTIFY_ACK,
|
|
notify_id, 0, 0);
|
|
rbd_osd_req_format_read(obj_request);
|
|
|
|
ret = rbd_obj_request_submit(osdc, obj_request);
|
|
out:
|
|
if (ret)
|
|
rbd_obj_request_put(obj_request);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
|
|
{
|
|
struct rbd_device *rbd_dev = (struct rbd_device *)data;
|
|
int ret;
|
|
|
|
if (!rbd_dev)
|
|
return;
|
|
|
|
dout("%s: \"%s\" notify_id %llu opcode %u\n", __func__,
|
|
rbd_dev->header_name, (unsigned long long)notify_id,
|
|
(unsigned int)opcode);
|
|
ret = rbd_dev_refresh(rbd_dev);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "header refresh error (%d)\n", ret);
|
|
|
|
rbd_obj_notify_ack(rbd_dev, notify_id);
|
|
}
|
|
|
|
/*
|
|
* Request sync osd watch/unwatch. The value of "start" determines
|
|
* whether a watch request is being initiated or torn down.
|
|
*/
|
|
static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, bool start)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_obj_request *obj_request;
|
|
int ret;
|
|
|
|
rbd_assert(start ^ !!rbd_dev->watch_event);
|
|
rbd_assert(start ^ !!rbd_dev->watch_request);
|
|
|
|
if (start) {
|
|
ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev,
|
|
&rbd_dev->watch_event);
|
|
if (ret < 0)
|
|
return ret;
|
|
rbd_assert(rbd_dev->watch_event != NULL);
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
|
|
OBJ_REQUEST_NODATA);
|
|
if (!obj_request)
|
|
goto out_cancel;
|
|
|
|
obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, obj_request);
|
|
if (!obj_request->osd_req)
|
|
goto out_cancel;
|
|
|
|
if (start)
|
|
ceph_osdc_set_request_linger(osdc, obj_request->osd_req);
|
|
else
|
|
ceph_osdc_unregister_linger_request(osdc,
|
|
rbd_dev->watch_request->osd_req);
|
|
|
|
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
|
|
rbd_dev->watch_event->cookie, 0, start ? 1 : 0);
|
|
rbd_osd_req_format_write(obj_request);
|
|
|
|
ret = rbd_obj_request_submit(osdc, obj_request);
|
|
if (ret)
|
|
goto out_cancel;
|
|
ret = rbd_obj_request_wait(obj_request);
|
|
if (ret)
|
|
goto out_cancel;
|
|
ret = obj_request->result;
|
|
if (ret)
|
|
goto out_cancel;
|
|
|
|
/*
|
|
* A watch request is set to linger, so the underlying osd
|
|
* request won't go away until we unregister it. We retain
|
|
* a pointer to the object request during that time (in
|
|
* rbd_dev->watch_request), so we'll keep a reference to
|
|
* it. We'll drop that reference (below) after we've
|
|
* unregistered it.
|
|
*/
|
|
if (start) {
|
|
rbd_dev->watch_request = obj_request;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We have successfully torn down the watch request */
|
|
|
|
rbd_obj_request_put(rbd_dev->watch_request);
|
|
rbd_dev->watch_request = NULL;
|
|
out_cancel:
|
|
/* Cancel the event if we're tearing down, or on error */
|
|
ceph_osdc_cancel_event(rbd_dev->watch_event);
|
|
rbd_dev->watch_event = NULL;
|
|
if (obj_request)
|
|
rbd_obj_request_put(obj_request);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Synchronous osd object method call. Returns the number of bytes
|
|
* returned in the outbound buffer, or a negative error code.
|
|
*/
|
|
static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
|
|
const char *object_name,
|
|
const char *class_name,
|
|
const char *method_name,
|
|
const void *outbound,
|
|
size_t outbound_size,
|
|
void *inbound,
|
|
size_t inbound_size)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_obj_request *obj_request;
|
|
struct page **pages;
|
|
u32 page_count;
|
|
int ret;
|
|
|
|
/*
|
|
* Method calls are ultimately read operations. The result
|
|
* should placed into the inbound buffer provided. They
|
|
* also supply outbound data--parameters for the object
|
|
* method. Currently if this is present it will be a
|
|
* snapshot id.
|
|
*/
|
|
page_count = (u32)calc_pages_for(0, inbound_size);
|
|
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
|
|
if (IS_ERR(pages))
|
|
return PTR_ERR(pages);
|
|
|
|
ret = -ENOMEM;
|
|
obj_request = rbd_obj_request_create(object_name, 0, inbound_size,
|
|
OBJ_REQUEST_PAGES);
|
|
if (!obj_request)
|
|
goto out;
|
|
|
|
obj_request->pages = pages;
|
|
obj_request->page_count = page_count;
|
|
|
|
obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request);
|
|
if (!obj_request->osd_req)
|
|
goto out;
|
|
|
|
osd_req_op_cls_init(obj_request->osd_req, 0, CEPH_OSD_OP_CALL,
|
|
class_name, method_name);
|
|
if (outbound_size) {
|
|
struct ceph_pagelist *pagelist;
|
|
|
|
pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
|
|
if (!pagelist)
|
|
goto out;
|
|
|
|
ceph_pagelist_init(pagelist);
|
|
ceph_pagelist_append(pagelist, outbound, outbound_size);
|
|
osd_req_op_cls_request_data_pagelist(obj_request->osd_req, 0,
|
|
pagelist);
|
|
}
|
|
osd_req_op_cls_response_data_pages(obj_request->osd_req, 0,
|
|
obj_request->pages, inbound_size,
|
|
0, false, false);
|
|
rbd_osd_req_format_read(obj_request);
|
|
|
|
ret = rbd_obj_request_submit(osdc, obj_request);
|
|
if (ret)
|
|
goto out;
|
|
ret = rbd_obj_request_wait(obj_request);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = obj_request->result;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
rbd_assert(obj_request->xferred < (u64)INT_MAX);
|
|
ret = (int)obj_request->xferred;
|
|
ceph_copy_from_page_vector(pages, inbound, 0, obj_request->xferred);
|
|
out:
|
|
if (obj_request)
|
|
rbd_obj_request_put(obj_request);
|
|
else
|
|
ceph_release_page_vector(pages, page_count);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_request_fn(struct request_queue *q)
|
|
__releases(q->queue_lock) __acquires(q->queue_lock)
|
|
{
|
|
struct rbd_device *rbd_dev = q->queuedata;
|
|
bool read_only = rbd_dev->mapping.read_only;
|
|
struct request *rq;
|
|
int result;
|
|
|
|
while ((rq = blk_fetch_request(q))) {
|
|
bool write_request = rq_data_dir(rq) == WRITE;
|
|
struct rbd_img_request *img_request;
|
|
u64 offset;
|
|
u64 length;
|
|
|
|
/* Ignore any non-FS requests that filter through. */
|
|
|
|
if (rq->cmd_type != REQ_TYPE_FS) {
|
|
dout("%s: non-fs request type %d\n", __func__,
|
|
(int) rq->cmd_type);
|
|
__blk_end_request_all(rq, 0);
|
|
continue;
|
|
}
|
|
|
|
/* Ignore/skip any zero-length requests */
|
|
|
|
offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT;
|
|
length = (u64) blk_rq_bytes(rq);
|
|
|
|
if (!length) {
|
|
dout("%s: zero-length request\n", __func__);
|
|
__blk_end_request_all(rq, 0);
|
|
continue;
|
|
}
|
|
|
|
spin_unlock_irq(q->queue_lock);
|
|
|
|
/* Disallow writes to a read-only device */
|
|
|
|
if (write_request) {
|
|
result = -EROFS;
|
|
if (read_only)
|
|
goto end_request;
|
|
rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP);
|
|
}
|
|
|
|
/*
|
|
* Quit early if the mapped snapshot no longer
|
|
* exists. It's still possible the snapshot will
|
|
* have disappeared by the time our request arrives
|
|
* at the osd, but there's no sense in sending it if
|
|
* we already know.
|
|
*/
|
|
if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) {
|
|
dout("request for non-existent snapshot");
|
|
rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
|
|
result = -ENXIO;
|
|
goto end_request;
|
|
}
|
|
|
|
result = -EINVAL;
|
|
if (offset && length > U64_MAX - offset + 1) {
|
|
rbd_warn(rbd_dev, "bad request range (%llu~%llu)\n",
|
|
offset, length);
|
|
goto end_request; /* Shouldn't happen */
|
|
}
|
|
|
|
result = -EIO;
|
|
if (offset + length > rbd_dev->mapping.size) {
|
|
rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)\n",
|
|
offset, length, rbd_dev->mapping.size);
|
|
goto end_request;
|
|
}
|
|
|
|
result = -ENOMEM;
|
|
img_request = rbd_img_request_create(rbd_dev, offset, length,
|
|
write_request);
|
|
if (!img_request)
|
|
goto end_request;
|
|
|
|
img_request->rq = rq;
|
|
|
|
result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
|
|
rq->bio);
|
|
if (!result)
|
|
result = rbd_img_request_submit(img_request);
|
|
if (result)
|
|
rbd_img_request_put(img_request);
|
|
end_request:
|
|
spin_lock_irq(q->queue_lock);
|
|
if (result < 0) {
|
|
rbd_warn(rbd_dev, "%s %llx at %llx result %d\n",
|
|
write_request ? "write" : "read",
|
|
length, offset, result);
|
|
|
|
__blk_end_request_all(rq, result);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* a queue callback. Makes sure that we don't create a bio that spans across
|
|
* multiple osd objects. One exception would be with a single page bios,
|
|
* which we handle later at bio_chain_clone_range()
|
|
*/
|
|
static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
|
|
struct bio_vec *bvec)
|
|
{
|
|
struct rbd_device *rbd_dev = q->queuedata;
|
|
sector_t sector_offset;
|
|
sector_t sectors_per_obj;
|
|
sector_t obj_sector_offset;
|
|
int ret;
|
|
|
|
/*
|
|
* Find how far into its rbd object the partition-relative
|
|
* bio start sector is to offset relative to the enclosing
|
|
* device.
|
|
*/
|
|
sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector;
|
|
sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT);
|
|
obj_sector_offset = sector_offset & (sectors_per_obj - 1);
|
|
|
|
/*
|
|
* Compute the number of bytes from that offset to the end
|
|
* of the object. Account for what's already used by the bio.
|
|
*/
|
|
ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT;
|
|
if (ret > bmd->bi_size)
|
|
ret -= bmd->bi_size;
|
|
else
|
|
ret = 0;
|
|
|
|
/*
|
|
* Don't send back more than was asked for. And if the bio
|
|
* was empty, let the whole thing through because: "Note
|
|
* that a block device *must* allow a single page to be
|
|
* added to an empty bio."
|
|
*/
|
|
rbd_assert(bvec->bv_len <= PAGE_SIZE);
|
|
if (ret > (int) bvec->bv_len || !bmd->bi_size)
|
|
ret = (int) bvec->bv_len;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_free_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
struct gendisk *disk = rbd_dev->disk;
|
|
|
|
if (!disk)
|
|
return;
|
|
|
|
rbd_dev->disk = NULL;
|
|
if (disk->flags & GENHD_FL_UP) {
|
|
del_gendisk(disk);
|
|
if (disk->queue)
|
|
blk_cleanup_queue(disk->queue);
|
|
}
|
|
put_disk(disk);
|
|
}
|
|
|
|
static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
|
|
const char *object_name,
|
|
u64 offset, u64 length, void *buf)
|
|
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_obj_request *obj_request;
|
|
struct page **pages = NULL;
|
|
u32 page_count;
|
|
size_t size;
|
|
int ret;
|
|
|
|
page_count = (u32) calc_pages_for(offset, length);
|
|
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
|
|
if (IS_ERR(pages))
|
|
ret = PTR_ERR(pages);
|
|
|
|
ret = -ENOMEM;
|
|
obj_request = rbd_obj_request_create(object_name, offset, length,
|
|
OBJ_REQUEST_PAGES);
|
|
if (!obj_request)
|
|
goto out;
|
|
|
|
obj_request->pages = pages;
|
|
obj_request->page_count = page_count;
|
|
|
|
obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, obj_request);
|
|
if (!obj_request->osd_req)
|
|
goto out;
|
|
|
|
osd_req_op_extent_init(obj_request->osd_req, 0, CEPH_OSD_OP_READ,
|
|
offset, length, 0, 0);
|
|
osd_req_op_extent_osd_data_pages(obj_request->osd_req, 0,
|
|
obj_request->pages,
|
|
obj_request->length,
|
|
obj_request->offset & ~PAGE_MASK,
|
|
false, false);
|
|
rbd_osd_req_format_read(obj_request);
|
|
|
|
ret = rbd_obj_request_submit(osdc, obj_request);
|
|
if (ret)
|
|
goto out;
|
|
ret = rbd_obj_request_wait(obj_request);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = obj_request->result;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
rbd_assert(obj_request->xferred <= (u64) SIZE_MAX);
|
|
size = (size_t) obj_request->xferred;
|
|
ceph_copy_from_page_vector(pages, buf, 0, size);
|
|
rbd_assert(size <= (size_t)INT_MAX);
|
|
ret = (int)size;
|
|
out:
|
|
if (obj_request)
|
|
rbd_obj_request_put(obj_request);
|
|
else
|
|
ceph_release_page_vector(pages, page_count);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read the complete header for the given rbd device. On successful
|
|
* return, the rbd_dev->header field will contain up-to-date
|
|
* information about the image.
|
|
*/
|
|
static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_image_header_ondisk *ondisk = NULL;
|
|
u32 snap_count = 0;
|
|
u64 names_size = 0;
|
|
u32 want_count;
|
|
int ret;
|
|
|
|
/*
|
|
* The complete header will include an array of its 64-bit
|
|
* snapshot ids, followed by the names of those snapshots as
|
|
* a contiguous block of NUL-terminated strings. Note that
|
|
* the number of snapshots could change by the time we read
|
|
* it in, in which case we re-read it.
|
|
*/
|
|
do {
|
|
size_t size;
|
|
|
|
kfree(ondisk);
|
|
|
|
size = sizeof (*ondisk);
|
|
size += snap_count * sizeof (struct rbd_image_snap_ondisk);
|
|
size += names_size;
|
|
ondisk = kmalloc(size, GFP_KERNEL);
|
|
if (!ondisk)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name,
|
|
0, size, ondisk);
|
|
if (ret < 0)
|
|
goto out;
|
|
if ((size_t)ret < size) {
|
|
ret = -ENXIO;
|
|
rbd_warn(rbd_dev, "short header read (want %zd got %d)",
|
|
size, ret);
|
|
goto out;
|
|
}
|
|
if (!rbd_dev_ondisk_valid(ondisk)) {
|
|
ret = -ENXIO;
|
|
rbd_warn(rbd_dev, "invalid header");
|
|
goto out;
|
|
}
|
|
|
|
names_size = le64_to_cpu(ondisk->snap_names_len);
|
|
want_count = snap_count;
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
} while (snap_count != want_count);
|
|
|
|
ret = rbd_header_from_disk(rbd_dev, ondisk);
|
|
out:
|
|
kfree(ondisk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Clear the rbd device's EXISTS flag if the snapshot it's mapped to
|
|
* has disappeared from the (just updated) snapshot context.
|
|
*/
|
|
static void rbd_exists_validate(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 snap_id;
|
|
|
|
if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags))
|
|
return;
|
|
|
|
snap_id = rbd_dev->spec->snap_id;
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return;
|
|
|
|
if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX)
|
|
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
}
|
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 mapping_size;
|
|
int ret;
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
down_write(&rbd_dev->header_rwsem);
|
|
mapping_size = rbd_dev->mapping.size;
|
|
if (rbd_dev->image_format == 1)
|
|
ret = rbd_dev_v1_header_info(rbd_dev);
|
|
else
|
|
ret = rbd_dev_v2_header_info(rbd_dev);
|
|
|
|
/* If it's a mapped snapshot, validate its EXISTS flag */
|
|
|
|
rbd_exists_validate(rbd_dev);
|
|
up_write(&rbd_dev->header_rwsem);
|
|
|
|
if (mapping_size != rbd_dev->mapping.size) {
|
|
sector_t size;
|
|
|
|
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
|
|
dout("setting size to %llu sectors", (unsigned long long)size);
|
|
set_capacity(rbd_dev->disk, size);
|
|
revalidate_disk(rbd_dev->disk);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_init_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
struct gendisk *disk;
|
|
struct request_queue *q;
|
|
u64 segment_size;
|
|
|
|
/* create gendisk info */
|
|
disk = alloc_disk(RBD_MINORS_PER_MAJOR);
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
|
|
snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d",
|
|
rbd_dev->dev_id);
|
|
disk->major = rbd_dev->major;
|
|
disk->first_minor = 0;
|
|
disk->fops = &rbd_bd_ops;
|
|
disk->private_data = rbd_dev;
|
|
|
|
q = blk_init_queue(rbd_request_fn, &rbd_dev->lock);
|
|
if (!q)
|
|
goto out_disk;
|
|
|
|
/* We use the default size, but let's be explicit about it. */
|
|
blk_queue_physical_block_size(q, SECTOR_SIZE);
|
|
|
|
/* set io sizes to object size */
|
|
segment_size = rbd_obj_bytes(&rbd_dev->header);
|
|
blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
|
|
blk_queue_max_segment_size(q, segment_size);
|
|
blk_queue_io_min(q, segment_size);
|
|
blk_queue_io_opt(q, segment_size);
|
|
|
|
blk_queue_merge_bvec(q, rbd_merge_bvec);
|
|
disk->queue = q;
|
|
|
|
q->queuedata = rbd_dev;
|
|
|
|
rbd_dev->disk = disk;
|
|
|
|
return 0;
|
|
out_disk:
|
|
put_disk(disk);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
sysfs
|
|
*/
|
|
|
|
static struct rbd_device *dev_to_rbd_dev(struct device *dev)
|
|
{
|
|
return container_of(dev, struct rbd_device, dev);
|
|
}
|
|
|
|
static ssize_t rbd_size_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n",
|
|
(unsigned long long)rbd_dev->mapping.size);
|
|
}
|
|
|
|
/*
|
|
* Note this shows the features for whatever's mapped, which is not
|
|
* necessarily the base image.
|
|
*/
|
|
static ssize_t rbd_features_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long)rbd_dev->mapping.features);
|
|
}
|
|
|
|
static ssize_t rbd_major_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->major)
|
|
return sprintf(buf, "%d\n", rbd_dev->major);
|
|
|
|
return sprintf(buf, "(none)\n");
|
|
|
|
}
|
|
|
|
static ssize_t rbd_client_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "client%lld\n",
|
|
ceph_client_id(rbd_dev->rbd_client->client));
|
|
}
|
|
|
|
static ssize_t rbd_pool_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->pool_name);
|
|
}
|
|
|
|
static ssize_t rbd_pool_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n",
|
|
(unsigned long long) rbd_dev->spec->pool_id);
|
|
}
|
|
|
|
static ssize_t rbd_name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->spec->image_name)
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_name);
|
|
|
|
return sprintf(buf, "(unknown)\n");
|
|
}
|
|
|
|
static ssize_t rbd_image_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_id);
|
|
}
|
|
|
|
/*
|
|
* Shows the name of the currently-mapped snapshot (or
|
|
* RBD_SNAP_HEAD_NAME for the base image).
|
|
*/
|
|
static ssize_t rbd_snap_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->snap_name);
|
|
}
|
|
|
|
/*
|
|
* For an rbd v2 image, shows the pool id, image id, and snapshot id
|
|
* for the parent image. If there is no parent, simply shows
|
|
* "(no parent image)".
|
|
*/
|
|
static ssize_t rbd_parent_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
struct rbd_spec *spec = rbd_dev->parent_spec;
|
|
int count;
|
|
char *bufp = buf;
|
|
|
|
if (!spec)
|
|
return sprintf(buf, "(no parent image)\n");
|
|
|
|
count = sprintf(bufp, "pool_id %llu\npool_name %s\n",
|
|
(unsigned long long) spec->pool_id, spec->pool_name);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id,
|
|
spec->image_name ? spec->image_name : "(unknown)");
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n",
|
|
(unsigned long long) spec->snap_id, spec->snap_name);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap);
|
|
if (count < 0)
|
|
return count;
|
|
bufp += count;
|
|
|
|
return (ssize_t) (bufp - buf);
|
|
}
|
|
|
|
static ssize_t rbd_image_refresh(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t size)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
int ret;
|
|
|
|
ret = rbd_dev_refresh(rbd_dev);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, ": manual header refresh error (%d)\n", ret);
|
|
|
|
return ret < 0 ? ret : size;
|
|
}
|
|
|
|
static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
|
|
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
|
|
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
|
|
static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
|
|
static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
|
|
static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);
|
|
static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
|
|
static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL);
|
|
static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh);
|
|
static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
|
|
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);
|
|
|
|
static struct attribute *rbd_attrs[] = {
|
|
&dev_attr_size.attr,
|
|
&dev_attr_features.attr,
|
|
&dev_attr_major.attr,
|
|
&dev_attr_client_id.attr,
|
|
&dev_attr_pool.attr,
|
|
&dev_attr_pool_id.attr,
|
|
&dev_attr_name.attr,
|
|
&dev_attr_image_id.attr,
|
|
&dev_attr_current_snap.attr,
|
|
&dev_attr_parent.attr,
|
|
&dev_attr_refresh.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group rbd_attr_group = {
|
|
.attrs = rbd_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *rbd_attr_groups[] = {
|
|
&rbd_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static void rbd_sysfs_dev_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static struct device_type rbd_device_type = {
|
|
.name = "rbd",
|
|
.groups = rbd_attr_groups,
|
|
.release = rbd_sysfs_dev_release,
|
|
};
|
|
|
|
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
|
|
{
|
|
kref_get(&spec->kref);
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref);
|
|
static void rbd_spec_put(struct rbd_spec *spec)
|
|
{
|
|
if (spec)
|
|
kref_put(&spec->kref, rbd_spec_free);
|
|
}
|
|
|
|
static struct rbd_spec *rbd_spec_alloc(void)
|
|
{
|
|
struct rbd_spec *spec;
|
|
|
|
spec = kzalloc(sizeof (*spec), GFP_KERNEL);
|
|
if (!spec)
|
|
return NULL;
|
|
kref_init(&spec->kref);
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref)
|
|
{
|
|
struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref);
|
|
|
|
kfree(spec->pool_name);
|
|
kfree(spec->image_id);
|
|
kfree(spec->image_name);
|
|
kfree(spec->snap_name);
|
|
kfree(spec);
|
|
}
|
|
|
|
static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
|
|
struct rbd_spec *spec)
|
|
{
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL);
|
|
if (!rbd_dev)
|
|
return NULL;
|
|
|
|
spin_lock_init(&rbd_dev->lock);
|
|
rbd_dev->flags = 0;
|
|
atomic_set(&rbd_dev->parent_ref, 0);
|
|
INIT_LIST_HEAD(&rbd_dev->node);
|
|
init_rwsem(&rbd_dev->header_rwsem);
|
|
|
|
rbd_dev->spec = spec;
|
|
rbd_dev->rbd_client = rbdc;
|
|
|
|
/* Initialize the layout used for all rbd requests */
|
|
|
|
rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
|
|
rbd_dev->layout.fl_stripe_count = cpu_to_le32(1);
|
|
rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
|
|
rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id);
|
|
|
|
return rbd_dev;
|
|
}
|
|
|
|
static void rbd_dev_destroy(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_put_client(rbd_dev->rbd_client);
|
|
rbd_spec_put(rbd_dev->spec);
|
|
kfree(rbd_dev);
|
|
}
|
|
|
|
/*
|
|
* Get the size and object order for an image snapshot, or if
|
|
* snap_id is CEPH_NOSNAP, gets this information for the base
|
|
* image.
|
|
*/
|
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u8 *order, u64 *snap_size)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
int ret;
|
|
struct {
|
|
u8 order;
|
|
__le64 size;
|
|
} __attribute__ ((packed)) size_buf = { 0 };
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_size",
|
|
&snapid, sizeof (snapid),
|
|
&size_buf, sizeof (size_buf));
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof (size_buf))
|
|
return -ERANGE;
|
|
|
|
if (order) {
|
|
*order = size_buf.order;
|
|
dout(" order %u", (unsigned int)*order);
|
|
}
|
|
*snap_size = le64_to_cpu(size_buf.size);
|
|
|
|
dout(" snap_id 0x%016llx snap_size = %llu\n",
|
|
(unsigned long long)snap_id,
|
|
(unsigned long long)*snap_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.obj_order,
|
|
&rbd_dev->header.image_size);
|
|
}
|
|
|
|
static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
|
|
{
|
|
void *reply_buf;
|
|
int ret;
|
|
void *p;
|
|
|
|
reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_object_prefix", NULL, 0,
|
|
reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
p = reply_buf;
|
|
rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
|
|
p + ret, NULL, GFP_NOIO);
|
|
ret = 0;
|
|
|
|
if (IS_ERR(rbd_dev->header.object_prefix)) {
|
|
ret = PTR_ERR(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
} else {
|
|
dout(" object_prefix = %s\n", rbd_dev->header.object_prefix);
|
|
}
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
struct {
|
|
__le64 features;
|
|
__le64 incompat;
|
|
} __attribute__ ((packed)) features_buf = { 0 };
|
|
u64 incompat;
|
|
int ret;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_features",
|
|
&snapid, sizeof (snapid),
|
|
&features_buf, sizeof (features_buf));
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof (features_buf))
|
|
return -ERANGE;
|
|
|
|
incompat = le64_to_cpu(features_buf.incompat);
|
|
if (incompat & ~RBD_FEATURES_SUPPORTED)
|
|
return -ENXIO;
|
|
|
|
*snap_features = le64_to_cpu(features_buf.features);
|
|
|
|
dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
|
|
(unsigned long long)snap_id,
|
|
(unsigned long long)*snap_features,
|
|
(unsigned long long)le64_to_cpu(features_buf.incompat));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_features(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.features);
|
|
}
|
|
|
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *parent_spec;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
__le64 snapid;
|
|
void *p;
|
|
void *end;
|
|
u64 pool_id;
|
|
char *image_id;
|
|
u64 snap_id;
|
|
u64 overlap;
|
|
int ret;
|
|
|
|
parent_spec = rbd_spec_alloc();
|
|
if (!parent_spec)
|
|
return -ENOMEM;
|
|
|
|
size = sizeof (__le64) + /* pool_id */
|
|
sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */
|
|
sizeof (__le64) + /* snap_id */
|
|
sizeof (__le64); /* overlap */
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
snapid = cpu_to_le64(CEPH_NOSNAP);
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_parent",
|
|
&snapid, sizeof (snapid),
|
|
reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
ret = -ERANGE;
|
|
ceph_decode_64_safe(&p, end, pool_id, out_err);
|
|
if (pool_id == CEPH_NOPOOL) {
|
|
/*
|
|
* Either the parent never existed, or we have
|
|
* record of it but the image got flattened so it no
|
|
* longer has a parent. When the parent of a
|
|
* layered image disappears we immediately set the
|
|
* overlap to 0. The effect of this is that all new
|
|
* requests will be treated as if the image had no
|
|
* parent.
|
|
*/
|
|
if (rbd_dev->parent_overlap) {
|
|
rbd_dev->parent_overlap = 0;
|
|
smp_mb();
|
|
rbd_dev_parent_put(rbd_dev);
|
|
pr_info("%s: clone image has been flattened\n",
|
|
rbd_dev->disk->disk_name);
|
|
}
|
|
|
|
goto out; /* No parent? No problem. */
|
|
}
|
|
|
|
/* The ceph file layout needs to fit pool id in 32 bits */
|
|
|
|
ret = -EIO;
|
|
if (pool_id > (u64)U32_MAX) {
|
|
rbd_warn(NULL, "parent pool id too large (%llu > %u)\n",
|
|
(unsigned long long)pool_id, U32_MAX);
|
|
goto out_err;
|
|
}
|
|
|
|
image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
|
|
if (IS_ERR(image_id)) {
|
|
ret = PTR_ERR(image_id);
|
|
goto out_err;
|
|
}
|
|
ceph_decode_64_safe(&p, end, snap_id, out_err);
|
|
ceph_decode_64_safe(&p, end, overlap, out_err);
|
|
|
|
/*
|
|
* The parent won't change (except when the clone is
|
|
* flattened, already handled that). So we only need to
|
|
* record the parent spec we have not already done so.
|
|
*/
|
|
if (!rbd_dev->parent_spec) {
|
|
parent_spec->pool_id = pool_id;
|
|
parent_spec->image_id = image_id;
|
|
parent_spec->snap_id = snap_id;
|
|
rbd_dev->parent_spec = parent_spec;
|
|
parent_spec = NULL; /* rbd_dev now owns this */
|
|
}
|
|
|
|
/*
|
|
* We always update the parent overlap. If it's zero we
|
|
* treat it specially.
|
|
*/
|
|
rbd_dev->parent_overlap = overlap;
|
|
smp_mb();
|
|
if (!overlap) {
|
|
|
|
/* A null parent_spec indicates it's the initial probe */
|
|
|
|
if (parent_spec) {
|
|
/*
|
|
* The overlap has become zero, so the clone
|
|
* must have been resized down to 0 at some
|
|
* point. Treat this the same as a flatten.
|
|
*/
|
|
rbd_dev_parent_put(rbd_dev);
|
|
pr_info("%s: clone image now standalone\n",
|
|
rbd_dev->disk->disk_name);
|
|
} else {
|
|
/*
|
|
* For the initial probe, if we find the
|
|
* overlap is zero we just pretend there was
|
|
* no parent image.
|
|
*/
|
|
rbd_warn(rbd_dev, "ignoring parent of "
|
|
"clone with overlap 0\n");
|
|
}
|
|
}
|
|
out:
|
|
ret = 0;
|
|
out_err:
|
|
kfree(reply_buf);
|
|
rbd_spec_put(parent_spec);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct {
|
|
__le64 stripe_unit;
|
|
__le64 stripe_count;
|
|
} __attribute__ ((packed)) striping_info_buf = { 0 };
|
|
size_t size = sizeof (striping_info_buf);
|
|
void *p;
|
|
u64 obj_size;
|
|
u64 stripe_unit;
|
|
u64 stripe_count;
|
|
int ret;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_stripe_unit_count", NULL, 0,
|
|
(char *)&striping_info_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < size)
|
|
return -ERANGE;
|
|
|
|
/*
|
|
* We don't actually support the "fancy striping" feature
|
|
* (STRIPINGV2) yet, but if the striping sizes are the
|
|
* defaults the behavior is the same as before. So find
|
|
* out, and only fail if the image has non-default values.
|
|
*/
|
|
ret = -EINVAL;
|
|
obj_size = (u64)1 << rbd_dev->header.obj_order;
|
|
p = &striping_info_buf;
|
|
stripe_unit = ceph_decode_64(&p);
|
|
if (stripe_unit != obj_size) {
|
|
rbd_warn(rbd_dev, "unsupported stripe unit "
|
|
"(got %llu want %llu)",
|
|
stripe_unit, obj_size);
|
|
return -EINVAL;
|
|
}
|
|
stripe_count = ceph_decode_64(&p);
|
|
if (stripe_count != 1) {
|
|
rbd_warn(rbd_dev, "unsupported stripe count "
|
|
"(got %llu want 1)", stripe_count);
|
|
return -EINVAL;
|
|
}
|
|
rbd_dev->header.stripe_unit = stripe_unit;
|
|
rbd_dev->header.stripe_count = stripe_count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
|
|
{
|
|
size_t image_id_size;
|
|
char *image_id;
|
|
void *p;
|
|
void *end;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
size_t len = 0;
|
|
char *image_name = NULL;
|
|
int ret;
|
|
|
|
rbd_assert(!rbd_dev->spec->image_name);
|
|
|
|
len = strlen(rbd_dev->spec->image_id);
|
|
image_id_size = sizeof (__le32) + len;
|
|
image_id = kmalloc(image_id_size, GFP_KERNEL);
|
|
if (!image_id)
|
|
return NULL;
|
|
|
|
p = image_id;
|
|
end = image_id + image_id_size;
|
|
ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len);
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
goto out;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY,
|
|
"rbd", "dir_get_name",
|
|
image_id, image_id_size,
|
|
reply_buf, size);
|
|
if (ret < 0)
|
|
goto out;
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
|
|
image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
|
|
if (IS_ERR(image_name))
|
|
image_name = NULL;
|
|
else
|
|
dout("%s: name is %s len is %zd\n", __func__, image_name, len);
|
|
out:
|
|
kfree(reply_buf);
|
|
kfree(image_id);
|
|
|
|
return image_name;
|
|
}
|
|
|
|
static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
const char *snap_name;
|
|
u32 which = 0;
|
|
|
|
/* Skip over names until we find the one we are looking for */
|
|
|
|
snap_name = rbd_dev->header.snap_names;
|
|
while (which < snapc->num_snaps) {
|
|
if (!strcmp(name, snap_name))
|
|
return snapc->snaps[which];
|
|
snap_name += strlen(snap_name) + 1;
|
|
which++;
|
|
}
|
|
return CEPH_NOSNAP;
|
|
}
|
|
|
|
static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
u32 which;
|
|
bool found = false;
|
|
u64 snap_id;
|
|
|
|
for (which = 0; !found && which < snapc->num_snaps; which++) {
|
|
const char *snap_name;
|
|
|
|
snap_id = snapc->snaps[which];
|
|
snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id);
|
|
if (IS_ERR(snap_name))
|
|
break;
|
|
found = !strcmp(name, snap_name);
|
|
kfree(snap_name);
|
|
}
|
|
return found ? snap_id : CEPH_NOSNAP;
|
|
}
|
|
|
|
/*
|
|
* Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if
|
|
* no snapshot by that name is found, or if an error occurs.
|
|
*/
|
|
static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_v1_snap_id_by_name(rbd_dev, name);
|
|
|
|
return rbd_v2_snap_id_by_name(rbd_dev, name);
|
|
}
|
|
|
|
/*
|
|
* When an rbd image has a parent image, it is identified by the
|
|
* pool, image, and snapshot ids (not names). This function fills
|
|
* in the names for those ids. (It's OK if we can't figure out the
|
|
* name for an image id, but the pool and snapshot ids should always
|
|
* exist and have names.) All names in an rbd spec are dynamically
|
|
* allocated.
|
|
*
|
|
* When an image being mapped (not a parent) is probed, we have the
|
|
* pool name and pool id, image name and image id, and the snapshot
|
|
* name. The only thing we're missing is the snapshot id.
|
|
*/
|
|
static int rbd_dev_spec_update(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_spec *spec = rbd_dev->spec;
|
|
const char *pool_name;
|
|
const char *image_name;
|
|
const char *snap_name;
|
|
int ret;
|
|
|
|
/*
|
|
* An image being mapped will have the pool name (etc.), but
|
|
* we need to look up the snapshot id.
|
|
*/
|
|
if (spec->pool_name) {
|
|
if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) {
|
|
u64 snap_id;
|
|
|
|
snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name);
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return -ENOENT;
|
|
spec->snap_id = snap_id;
|
|
} else {
|
|
spec->snap_id = CEPH_NOSNAP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Get the pool name; we have to make our own copy of this */
|
|
|
|
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id);
|
|
if (!pool_name) {
|
|
rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id);
|
|
return -EIO;
|
|
}
|
|
pool_name = kstrdup(pool_name, GFP_KERNEL);
|
|
if (!pool_name)
|
|
return -ENOMEM;
|
|
|
|
/* Fetch the image name; tolerate failure here */
|
|
|
|
image_name = rbd_dev_image_name(rbd_dev);
|
|
if (!image_name)
|
|
rbd_warn(rbd_dev, "unable to get image name");
|
|
|
|
/* Look up the snapshot name, and make a copy */
|
|
|
|
snap_name = rbd_snap_name(rbd_dev, spec->snap_id);
|
|
if (!snap_name) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
spec->pool_name = pool_name;
|
|
spec->image_name = image_name;
|
|
spec->snap_name = snap_name;
|
|
|
|
return 0;
|
|
out_err:
|
|
kfree(image_name);
|
|
kfree(pool_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev)
|
|
{
|
|
size_t size;
|
|
int ret;
|
|
void *reply_buf;
|
|
void *p;
|
|
void *end;
|
|
u64 seq;
|
|
u32 snap_count;
|
|
struct ceph_snap_context *snapc;
|
|
u32 i;
|
|
|
|
/*
|
|
* We'll need room for the seq value (maximum snapshot id),
|
|
* snapshot count, and array of that many snapshot ids.
|
|
* For now we have a fixed upper limit on the number we're
|
|
* prepared to receive.
|
|
*/
|
|
size = sizeof (__le64) + sizeof (__le32) +
|
|
RBD_MAX_SNAP_COUNT * sizeof (__le64);
|
|
reply_buf = kzalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_snapcontext", NULL, 0,
|
|
reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
ret = -ERANGE;
|
|
ceph_decode_64_safe(&p, end, seq, out);
|
|
ceph_decode_32_safe(&p, end, snap_count, out);
|
|
|
|
/*
|
|
* Make sure the reported number of snapshot ids wouldn't go
|
|
* beyond the end of our buffer. But before checking that,
|
|
* make sure the computed size of the snapshot context we
|
|
* allocate is representable in a size_t.
|
|
*/
|
|
if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context))
|
|
/ sizeof (u64)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!ceph_has_room(&p, end, snap_count * sizeof (__le64)))
|
|
goto out;
|
|
ret = 0;
|
|
|
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
|
|
if (!snapc) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
snapc->seq = seq;
|
|
for (i = 0; i < snap_count; i++)
|
|
snapc->snaps[i] = ceph_decode_64(&p);
|
|
|
|
ceph_put_snap_context(rbd_dev->header.snapc);
|
|
rbd_dev->header.snapc = snapc;
|
|
|
|
dout(" snap context seq = %llu, snap_count = %u\n",
|
|
(unsigned long long)seq, (unsigned int)snap_count);
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
|
|
u64 snap_id)
|
|
{
|
|
size_t size;
|
|
void *reply_buf;
|
|
__le64 snapid;
|
|
int ret;
|
|
void *p;
|
|
void *end;
|
|
char *snap_name;
|
|
|
|
size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
snapid = cpu_to_le64(snap_id);
|
|
ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
|
|
"rbd", "get_snapshot_name",
|
|
&snapid, sizeof (snapid),
|
|
reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0) {
|
|
snap_name = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
|
|
if (IS_ERR(snap_name))
|
|
goto out;
|
|
|
|
dout(" snap_id 0x%016llx snap_name = %s\n",
|
|
(unsigned long long)snap_id, snap_name);
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return snap_name;
|
|
}
|
|
|
|
static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev)
|
|
{
|
|
bool first_time = rbd_dev->header.object_prefix == NULL;
|
|
int ret;
|
|
|
|
ret = rbd_dev_v2_image_size(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (first_time) {
|
|
ret = rbd_dev_v2_header_onetime(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If the image supports layering, get the parent info. We
|
|
* need to probe the first time regardless. Thereafter we
|
|
* only need to if there's a parent, to see if it has
|
|
* disappeared due to the mapped image getting flattened.
|
|
*/
|
|
if (rbd_dev->header.features & RBD_FEATURE_LAYERING &&
|
|
(first_time || rbd_dev->parent_spec)) {
|
|
bool warn;
|
|
|
|
ret = rbd_dev_v2_parent_info(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Print a warning if this is the initial probe and
|
|
* the image has a parent. Don't print it if the
|
|
* image now being probed is itself a parent. We
|
|
* can tell at this point because we won't know its
|
|
* pool name yet (just its pool id).
|
|
*/
|
|
warn = rbd_dev->parent_spec && rbd_dev->spec->pool_name;
|
|
if (first_time && warn)
|
|
rbd_warn(rbd_dev, "WARNING: kernel layering "
|
|
"is EXPERIMENTAL!");
|
|
}
|
|
|
|
if (rbd_dev->spec->snap_id == CEPH_NOSNAP)
|
|
if (rbd_dev->mapping.size != rbd_dev->header.image_size)
|
|
rbd_dev->mapping.size = rbd_dev->header.image_size;
|
|
|
|
ret = rbd_dev_v2_snap_context(rbd_dev);
|
|
dout("rbd_dev_v2_snap_context returned %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
|
|
{
|
|
struct device *dev;
|
|
int ret;
|
|
|
|
dev = &rbd_dev->dev;
|
|
dev->bus = &rbd_bus_type;
|
|
dev->type = &rbd_device_type;
|
|
dev->parent = &rbd_root_dev;
|
|
dev->release = rbd_dev_device_release;
|
|
dev_set_name(dev, "%d", rbd_dev->dev_id);
|
|
ret = device_register(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
|
|
{
|
|
device_unregister(&rbd_dev->dev);
|
|
}
|
|
|
|
static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0);
|
|
|
|
/*
|
|
* Get a unique rbd identifier for the given new rbd_dev, and add
|
|
* the rbd_dev to the global list. The minimum rbd id is 1.
|
|
*/
|
|
static void rbd_dev_id_get(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max);
|
|
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_add_tail(&rbd_dev->node, &rbd_dev_list);
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
dout("rbd_dev %p given dev id %llu\n", rbd_dev,
|
|
(unsigned long long) rbd_dev->dev_id);
|
|
}
|
|
|
|
/*
|
|
* Remove an rbd_dev from the global list, and record that its
|
|
* identifier is no longer in use.
|
|
*/
|
|
static void rbd_dev_id_put(struct rbd_device *rbd_dev)
|
|
{
|
|
struct list_head *tmp;
|
|
int rbd_id = rbd_dev->dev_id;
|
|
int max_id;
|
|
|
|
rbd_assert(rbd_id > 0);
|
|
|
|
dout("rbd_dev %p released dev id %llu\n", rbd_dev,
|
|
(unsigned long long) rbd_dev->dev_id);
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_del_init(&rbd_dev->node);
|
|
|
|
/*
|
|
* If the id being "put" is not the current maximum, there
|
|
* is nothing special we need to do.
|
|
*/
|
|
if (rbd_id != atomic64_read(&rbd_dev_id_max)) {
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We need to update the current maximum id. Search the
|
|
* list to find out what it is. We're more likely to find
|
|
* the maximum at the end, so search the list backward.
|
|
*/
|
|
max_id = 0;
|
|
list_for_each_prev(tmp, &rbd_dev_list) {
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
|
if (rbd_dev->dev_id > max_id)
|
|
max_id = rbd_dev->dev_id;
|
|
}
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
|
|
/*
|
|
* The max id could have been updated by rbd_dev_id_get(), in
|
|
* which case it now accurately reflects the new maximum.
|
|
* Be careful not to overwrite the maximum value in that
|
|
* case.
|
|
*/
|
|
atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id);
|
|
dout(" max dev id has been reset\n");
|
|
}
|
|
|
|
/*
|
|
* Skips over white space at *buf, and updates *buf to point to the
|
|
* first found non-space character (if any). Returns the length of
|
|
* the token (string of non-white space characters) found. Note
|
|
* that *buf must be terminated with '\0'.
|
|
*/
|
|
static inline size_t next_token(const char **buf)
|
|
{
|
|
/*
|
|
* These are the characters that produce nonzero for
|
|
* isspace() in the "C" and "POSIX" locales.
|
|
*/
|
|
const char *spaces = " \f\n\r\t\v";
|
|
|
|
*buf += strspn(*buf, spaces); /* Find start of token */
|
|
|
|
return strcspn(*buf, spaces); /* Return token length */
|
|
}
|
|
|
|
/*
|
|
* Finds the next token in *buf, and if the provided token buffer is
|
|
* big enough, copies the found token into it. The result, if
|
|
* copied, is guaranteed to be terminated with '\0'. Note that *buf
|
|
* must be terminated with '\0' on entry.
|
|
*
|
|
* Returns the length of the token found (not including the '\0').
|
|
* Return value will be 0 if no token is found, and it will be >=
|
|
* token_size if the token would not fit.
|
|
*
|
|
* The *buf pointer will be updated to point beyond the end of the
|
|
* found token. Note that this occurs even if the token buffer is
|
|
* too small to hold it.
|
|
*/
|
|
static inline size_t copy_token(const char **buf,
|
|
char *token,
|
|
size_t token_size)
|
|
{
|
|
size_t len;
|
|
|
|
len = next_token(buf);
|
|
if (len < token_size) {
|
|
memcpy(token, *buf, len);
|
|
*(token + len) = '\0';
|
|
}
|
|
*buf += len;
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Finds the next token in *buf, dynamically allocates a buffer big
|
|
* enough to hold a copy of it, and copies the token into the new
|
|
* buffer. The copy is guaranteed to be terminated with '\0'. Note
|
|
* that a duplicate buffer is created even for a zero-length token.
|
|
*
|
|
* Returns a pointer to the newly-allocated duplicate, or a null
|
|
* pointer if memory for the duplicate was not available. If
|
|
* the lenp argument is a non-null pointer, the length of the token
|
|
* (not including the '\0') is returned in *lenp.
|
|
*
|
|
* If successful, the *buf pointer will be updated to point beyond
|
|
* the end of the found token.
|
|
*
|
|
* Note: uses GFP_KERNEL for allocation.
|
|
*/
|
|
static inline char *dup_token(const char **buf, size_t *lenp)
|
|
{
|
|
char *dup;
|
|
size_t len;
|
|
|
|
len = next_token(buf);
|
|
dup = kmemdup(*buf, len + 1, GFP_KERNEL);
|
|
if (!dup)
|
|
return NULL;
|
|
*(dup + len) = '\0';
|
|
*buf += len;
|
|
|
|
if (lenp)
|
|
*lenp = len;
|
|
|
|
return dup;
|
|
}
|
|
|
|
/*
|
|
* Parse the options provided for an "rbd add" (i.e., rbd image
|
|
* mapping) request. These arrive via a write to /sys/bus/rbd/add,
|
|
* and the data written is passed here via a NUL-terminated buffer.
|
|
* Returns 0 if successful or an error code otherwise.
|
|
*
|
|
* The information extracted from these options is recorded in
|
|
* the other parameters which return dynamically-allocated
|
|
* structures:
|
|
* ceph_opts
|
|
* The address of a pointer that will refer to a ceph options
|
|
* structure. Caller must release the returned pointer using
|
|
* ceph_destroy_options() when it is no longer needed.
|
|
* rbd_opts
|
|
* Address of an rbd options pointer. Fully initialized by
|
|
* this function; caller must release with kfree().
|
|
* spec
|
|
* Address of an rbd image specification pointer. Fully
|
|
* initialized by this function based on parsed options.
|
|
* Caller must release with rbd_spec_put().
|
|
*
|
|
* The options passed take this form:
|
|
* <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
|
|
* where:
|
|
* <mon_addrs>
|
|
* A comma-separated list of one or more monitor addresses.
|
|
* A monitor address is an ip address, optionally followed
|
|
* by a port number (separated by a colon).
|
|
* I.e.: ip1[:port1][,ip2[:port2]...]
|
|
* <options>
|
|
* A comma-separated list of ceph and/or rbd options.
|
|
* <pool_name>
|
|
* The name of the rados pool containing the rbd image.
|
|
* <image_name>
|
|
* The name of the image in that pool to map.
|
|
* <snap_id>
|
|
* An optional snapshot id. If provided, the mapping will
|
|
* present data from the image at the time that snapshot was
|
|
* created. The image head is used if no snapshot id is
|
|
* provided. Snapshot mappings are always read-only.
|
|
*/
|
|
static int rbd_add_parse_args(const char *buf,
|
|
struct ceph_options **ceph_opts,
|
|
struct rbd_options **opts,
|
|
struct rbd_spec **rbd_spec)
|
|
{
|
|
size_t len;
|
|
char *options;
|
|
const char *mon_addrs;
|
|
char *snap_name;
|
|
size_t mon_addrs_size;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct ceph_options *copts;
|
|
int ret;
|
|
|
|
/* The first four tokens are required */
|
|
|
|
len = next_token(&buf);
|
|
if (!len) {
|
|
rbd_warn(NULL, "no monitor address(es) provided");
|
|
return -EINVAL;
|
|
}
|
|
mon_addrs = buf;
|
|
mon_addrs_size = len + 1;
|
|
buf += len;
|
|
|
|
ret = -EINVAL;
|
|
options = dup_token(&buf, NULL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
if (!*options) {
|
|
rbd_warn(NULL, "no options provided");
|
|
goto out_err;
|
|
}
|
|
|
|
spec = rbd_spec_alloc();
|
|
if (!spec)
|
|
goto out_mem;
|
|
|
|
spec->pool_name = dup_token(&buf, NULL);
|
|
if (!spec->pool_name)
|
|
goto out_mem;
|
|
if (!*spec->pool_name) {
|
|
rbd_warn(NULL, "no pool name provided");
|
|
goto out_err;
|
|
}
|
|
|
|
spec->image_name = dup_token(&buf, NULL);
|
|
if (!spec->image_name)
|
|
goto out_mem;
|
|
if (!*spec->image_name) {
|
|
rbd_warn(NULL, "no image name provided");
|
|
goto out_err;
|
|
}
|
|
|
|
/*
|
|
* Snapshot name is optional; default is to use "-"
|
|
* (indicating the head/no snapshot).
|
|
*/
|
|
len = next_token(&buf);
|
|
if (!len) {
|
|
buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
|
|
len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
|
|
} else if (len > RBD_MAX_SNAP_NAME_LEN) {
|
|
ret = -ENAMETOOLONG;
|
|
goto out_err;
|
|
}
|
|
snap_name = kmemdup(buf, len + 1, GFP_KERNEL);
|
|
if (!snap_name)
|
|
goto out_mem;
|
|
*(snap_name + len) = '\0';
|
|
spec->snap_name = snap_name;
|
|
|
|
/* Initialize all rbd options to the defaults */
|
|
|
|
rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL);
|
|
if (!rbd_opts)
|
|
goto out_mem;
|
|
|
|
rbd_opts->read_only = RBD_READ_ONLY_DEFAULT;
|
|
|
|
copts = ceph_parse_options(options, mon_addrs,
|
|
mon_addrs + mon_addrs_size - 1,
|
|
parse_rbd_opts_token, rbd_opts);
|
|
if (IS_ERR(copts)) {
|
|
ret = PTR_ERR(copts);
|
|
goto out_err;
|
|
}
|
|
kfree(options);
|
|
|
|
*ceph_opts = copts;
|
|
*opts = rbd_opts;
|
|
*rbd_spec = spec;
|
|
|
|
return 0;
|
|
out_mem:
|
|
ret = -ENOMEM;
|
|
out_err:
|
|
kfree(rbd_opts);
|
|
rbd_spec_put(spec);
|
|
kfree(options);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* An rbd format 2 image has a unique identifier, distinct from the
|
|
* name given to it by the user. Internally, that identifier is
|
|
* what's used to specify the names of objects related to the image.
|
|
*
|
|
* A special "rbd id" object is used to map an rbd image name to its
|
|
* id. If that object doesn't exist, then there is no v2 rbd image
|
|
* with the supplied name.
|
|
*
|
|
* This function will record the given rbd_dev's image_id field if
|
|
* it can be determined, and in that case will return 0. If any
|
|
* errors occur a negative errno will be returned and the rbd_dev's
|
|
* image_id field will be unchanged (and should be NULL).
|
|
*/
|
|
static int rbd_dev_image_id(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
size_t size;
|
|
char *object_name;
|
|
void *response;
|
|
char *image_id;
|
|
|
|
/*
|
|
* When probing a parent image, the image id is already
|
|
* known (and the image name likely is not). There's no
|
|
* need to fetch the image id again in this case. We
|
|
* do still need to set the image format though.
|
|
*/
|
|
if (rbd_dev->spec->image_id) {
|
|
rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* First, see if the format 2 image id file exists, and if
|
|
* so, get the image's persistent id from it.
|
|
*/
|
|
size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name);
|
|
object_name = kmalloc(size, GFP_NOIO);
|
|
if (!object_name)
|
|
return -ENOMEM;
|
|
sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name);
|
|
dout("rbd id object name is %s\n", object_name);
|
|
|
|
/* Response will be an encoded string, which includes a length */
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX;
|
|
response = kzalloc(size, GFP_NOIO);
|
|
if (!response) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* If it doesn't exist we'll assume it's a format 1 image */
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, object_name,
|
|
"rbd", "get_id", NULL, 0,
|
|
response, RBD_IMAGE_ID_LEN_MAX);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret == -ENOENT) {
|
|
image_id = kstrdup("", GFP_KERNEL);
|
|
ret = image_id ? 0 : -ENOMEM;
|
|
if (!ret)
|
|
rbd_dev->image_format = 1;
|
|
} else if (ret > sizeof (__le32)) {
|
|
void *p = response;
|
|
|
|
image_id = ceph_extract_encoded_string(&p, p + ret,
|
|
NULL, GFP_NOIO);
|
|
ret = IS_ERR(image_id) ? PTR_ERR(image_id) : 0;
|
|
if (!ret)
|
|
rbd_dev->image_format = 2;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (!ret) {
|
|
rbd_dev->spec->image_id = image_id;
|
|
dout("image_id is %s\n", image_id);
|
|
}
|
|
out:
|
|
kfree(response);
|
|
kfree(object_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Undo whatever state changes are made by v1 or v2 header info
|
|
* call.
|
|
*/
|
|
static void rbd_dev_unprobe(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_image_header *header;
|
|
|
|
/* Drop parent reference unless it's already been done (or none) */
|
|
|
|
if (rbd_dev->parent_overlap)
|
|
rbd_dev_parent_put(rbd_dev);
|
|
|
|
/* Free dynamic fields from the header, then zero it out */
|
|
|
|
header = &rbd_dev->header;
|
|
ceph_put_snap_context(header->snapc);
|
|
kfree(header->snap_sizes);
|
|
kfree(header->snap_names);
|
|
kfree(header->object_prefix);
|
|
memset(header, 0, sizeof (*header));
|
|
}
|
|
|
|
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = rbd_dev_v2_object_prefix(rbd_dev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Get the and check features for the image. Currently the
|
|
* features are assumed to never change.
|
|
*/
|
|
ret = rbd_dev_v2_features(rbd_dev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* If the image supports fancy striping, get its parameters */
|
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) {
|
|
ret = rbd_dev_v2_striping_info(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
/* No support for crypto and compression type format 2 images */
|
|
|
|
return 0;
|
|
out_err:
|
|
rbd_dev->header.features = 0;
|
|
kfree(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_probe_parent(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_device *parent = NULL;
|
|
struct rbd_spec *parent_spec;
|
|
struct rbd_client *rbdc;
|
|
int ret;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return 0;
|
|
/*
|
|
* We need to pass a reference to the client and the parent
|
|
* spec when creating the parent rbd_dev. Images related by
|
|
* parent/child relationships always share both.
|
|
*/
|
|
parent_spec = rbd_spec_get(rbd_dev->parent_spec);
|
|
rbdc = __rbd_get_client(rbd_dev->rbd_client);
|
|
|
|
ret = -ENOMEM;
|
|
parent = rbd_dev_create(rbdc, parent_spec);
|
|
if (!parent)
|
|
goto out_err;
|
|
|
|
ret = rbd_dev_image_probe(parent, false);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
rbd_dev->parent = parent;
|
|
atomic_set(&rbd_dev->parent_ref, 1);
|
|
|
|
return 0;
|
|
out_err:
|
|
if (parent) {
|
|
rbd_dev_unparent(rbd_dev);
|
|
kfree(rbd_dev->header_name);
|
|
rbd_dev_destroy(parent);
|
|
} else {
|
|
rbd_put_client(rbdc);
|
|
rbd_spec_put(parent_spec);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
/* generate unique id: find highest unique id, add one */
|
|
rbd_dev_id_get(rbd_dev);
|
|
|
|
/* Fill in the device name, now that we have its id. */
|
|
BUILD_BUG_ON(DEV_NAME_LEN
|
|
< sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH);
|
|
sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id);
|
|
|
|
/* Get our block major device number. */
|
|
|
|
ret = register_blkdev(0, rbd_dev->name);
|
|
if (ret < 0)
|
|
goto err_out_id;
|
|
rbd_dev->major = ret;
|
|
|
|
/* Set up the blkdev mapping. */
|
|
|
|
ret = rbd_init_disk(rbd_dev);
|
|
if (ret)
|
|
goto err_out_blkdev;
|
|
|
|
ret = rbd_dev_mapping_set(rbd_dev);
|
|
if (ret)
|
|
goto err_out_disk;
|
|
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
|
|
|
|
ret = rbd_bus_add_dev(rbd_dev);
|
|
if (ret)
|
|
goto err_out_mapping;
|
|
|
|
/* Everything's ready. Announce the disk to the world. */
|
|
|
|
set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
add_disk(rbd_dev->disk);
|
|
|
|
pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name,
|
|
(unsigned long long) rbd_dev->mapping.size);
|
|
|
|
return ret;
|
|
|
|
err_out_mapping:
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
err_out_disk:
|
|
rbd_free_disk(rbd_dev);
|
|
err_out_blkdev:
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
err_out_id:
|
|
rbd_dev_id_put(rbd_dev);
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_header_name(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *spec = rbd_dev->spec;
|
|
size_t size;
|
|
|
|
/* Record the header object name for this rbd image. */
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
|
|
if (rbd_dev->image_format == 1)
|
|
size = strlen(spec->image_name) + sizeof (RBD_SUFFIX);
|
|
else
|
|
size = sizeof (RBD_HEADER_PREFIX) + strlen(spec->image_id);
|
|
|
|
rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
|
|
if (!rbd_dev->header_name)
|
|
return -ENOMEM;
|
|
|
|
if (rbd_dev->image_format == 1)
|
|
sprintf(rbd_dev->header_name, "%s%s",
|
|
spec->image_name, RBD_SUFFIX);
|
|
else
|
|
sprintf(rbd_dev->header_name, "%s%s",
|
|
RBD_HEADER_PREFIX, spec->image_id);
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_dev_image_release(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev_unprobe(rbd_dev);
|
|
kfree(rbd_dev->header_name);
|
|
rbd_dev->header_name = NULL;
|
|
rbd_dev->image_format = 0;
|
|
kfree(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
|
|
rbd_dev_destroy(rbd_dev);
|
|
}
|
|
|
|
/*
|
|
* Probe for the existence of the header object for the given rbd
|
|
* device. If this image is the one being mapped (i.e., not a
|
|
* parent), initiate a watch on its header object before using that
|
|
* object to get detailed information about the rbd image.
|
|
*/
|
|
static int rbd_dev_image_probe(struct rbd_device *rbd_dev, bool mapping)
|
|
{
|
|
int ret;
|
|
int tmp;
|
|
|
|
/*
|
|
* Get the id from the image id object. Unless there's an
|
|
* error, rbd_dev->spec->image_id will be filled in with
|
|
* a dynamically-allocated string, and rbd_dev->image_format
|
|
* will be set to either 1 or 2.
|
|
*/
|
|
ret = rbd_dev_image_id(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
rbd_assert(rbd_dev->spec->image_id);
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
|
|
ret = rbd_dev_header_name(rbd_dev);
|
|
if (ret)
|
|
goto err_out_format;
|
|
|
|
if (mapping) {
|
|
ret = rbd_dev_header_watch_sync(rbd_dev, true);
|
|
if (ret)
|
|
goto out_header_name;
|
|
}
|
|
|
|
if (rbd_dev->image_format == 1)
|
|
ret = rbd_dev_v1_header_info(rbd_dev);
|
|
else
|
|
ret = rbd_dev_v2_header_info(rbd_dev);
|
|
if (ret)
|
|
goto err_out_watch;
|
|
|
|
ret = rbd_dev_spec_update(rbd_dev);
|
|
if (ret)
|
|
goto err_out_probe;
|
|
|
|
ret = rbd_dev_probe_parent(rbd_dev);
|
|
if (ret)
|
|
goto err_out_probe;
|
|
|
|
dout("discovered format %u image, header name is %s\n",
|
|
rbd_dev->image_format, rbd_dev->header_name);
|
|
|
|
return 0;
|
|
err_out_probe:
|
|
rbd_dev_unprobe(rbd_dev);
|
|
err_out_watch:
|
|
if (mapping) {
|
|
tmp = rbd_dev_header_watch_sync(rbd_dev, false);
|
|
if (tmp)
|
|
rbd_warn(rbd_dev, "unable to tear down "
|
|
"watch request (%d)\n", tmp);
|
|
}
|
|
out_header_name:
|
|
kfree(rbd_dev->header_name);
|
|
rbd_dev->header_name = NULL;
|
|
err_out_format:
|
|
rbd_dev->image_format = 0;
|
|
kfree(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
|
|
dout("probe failed, returning %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t rbd_add(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
struct ceph_options *ceph_opts = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_client *rbdc;
|
|
struct ceph_osd_client *osdc;
|
|
bool read_only;
|
|
int rc = -ENOMEM;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -ENODEV;
|
|
|
|
/* parse add command */
|
|
rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
|
|
if (rc < 0)
|
|
goto err_out_module;
|
|
read_only = rbd_opts->read_only;
|
|
kfree(rbd_opts);
|
|
rbd_opts = NULL; /* done with this */
|
|
|
|
rbdc = rbd_get_client(ceph_opts);
|
|
if (IS_ERR(rbdc)) {
|
|
rc = PTR_ERR(rbdc);
|
|
goto err_out_args;
|
|
}
|
|
|
|
/* pick the pool */
|
|
osdc = &rbdc->client->osdc;
|
|
rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name);
|
|
if (rc < 0)
|
|
goto err_out_client;
|
|
spec->pool_id = (u64)rc;
|
|
|
|
/* The ceph file layout needs to fit pool id in 32 bits */
|
|
|
|
if (spec->pool_id > (u64)U32_MAX) {
|
|
rbd_warn(NULL, "pool id too large (%llu > %u)\n",
|
|
(unsigned long long)spec->pool_id, U32_MAX);
|
|
rc = -EIO;
|
|
goto err_out_client;
|
|
}
|
|
|
|
rbd_dev = rbd_dev_create(rbdc, spec);
|
|
if (!rbd_dev)
|
|
goto err_out_client;
|
|
rbdc = NULL; /* rbd_dev now owns this */
|
|
spec = NULL; /* rbd_dev now owns this */
|
|
|
|
rc = rbd_dev_image_probe(rbd_dev, true);
|
|
if (rc < 0)
|
|
goto err_out_rbd_dev;
|
|
|
|
/* If we are mapping a snapshot it must be marked read-only */
|
|
|
|
if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
|
|
read_only = true;
|
|
rbd_dev->mapping.read_only = read_only;
|
|
|
|
rc = rbd_dev_device_setup(rbd_dev);
|
|
if (rc) {
|
|
rbd_dev_image_release(rbd_dev);
|
|
goto err_out_module;
|
|
}
|
|
|
|
return count;
|
|
|
|
err_out_rbd_dev:
|
|
rbd_dev_destroy(rbd_dev);
|
|
err_out_client:
|
|
rbd_put_client(rbdc);
|
|
err_out_args:
|
|
rbd_spec_put(spec);
|
|
err_out_module:
|
|
module_put(THIS_MODULE);
|
|
|
|
dout("Error adding device %s\n", buf);
|
|
|
|
return (ssize_t)rc;
|
|
}
|
|
|
|
static void rbd_dev_device_release(struct device *dev)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
rbd_free_disk(rbd_dev);
|
|
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
rbd_dev->major = 0;
|
|
rbd_dev_id_put(rbd_dev);
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
}
|
|
|
|
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
|
|
{
|
|
while (rbd_dev->parent) {
|
|
struct rbd_device *first = rbd_dev;
|
|
struct rbd_device *second = first->parent;
|
|
struct rbd_device *third;
|
|
|
|
/*
|
|
* Follow to the parent with no grandparent and
|
|
* remove it.
|
|
*/
|
|
while (second && (third = second->parent)) {
|
|
first = second;
|
|
second = third;
|
|
}
|
|
rbd_assert(second);
|
|
rbd_dev_image_release(second);
|
|
first->parent = NULL;
|
|
first->parent_overlap = 0;
|
|
|
|
rbd_assert(first->parent_spec);
|
|
rbd_spec_put(first->parent_spec);
|
|
first->parent_spec = NULL;
|
|
}
|
|
}
|
|
|
|
static ssize_t rbd_remove(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
struct list_head *tmp;
|
|
int dev_id;
|
|
unsigned long ul;
|
|
bool already = false;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &ul);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* convert to int; abort if we lost anything in the conversion */
|
|
dev_id = (int)ul;
|
|
if (dev_id != ul)
|
|
return -EINVAL;
|
|
|
|
ret = -ENOENT;
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_for_each(tmp, &rbd_dev_list) {
|
|
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
|
if (rbd_dev->dev_id == dev_id) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (!ret) {
|
|
spin_lock_irq(&rbd_dev->lock);
|
|
if (rbd_dev->open_count)
|
|
ret = -EBUSY;
|
|
else
|
|
already = test_and_set_bit(RBD_DEV_FLAG_REMOVING,
|
|
&rbd_dev->flags);
|
|
spin_unlock_irq(&rbd_dev->lock);
|
|
}
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
if (ret < 0 || already)
|
|
return ret;
|
|
|
|
rbd_bus_del_dev(rbd_dev);
|
|
ret = rbd_dev_header_watch_sync(rbd_dev, false);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "failed to cancel watch event (%d)\n", ret);
|
|
rbd_dev_image_release(rbd_dev);
|
|
module_put(THIS_MODULE);
|
|
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* create control files in sysfs
|
|
* /sys/bus/rbd/...
|
|
*/
|
|
static int rbd_sysfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_register(&rbd_root_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = bus_register(&rbd_bus_type);
|
|
if (ret < 0)
|
|
device_unregister(&rbd_root_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_sysfs_cleanup(void)
|
|
{
|
|
bus_unregister(&rbd_bus_type);
|
|
device_unregister(&rbd_root_dev);
|
|
}
|
|
|
|
static int rbd_slab_init(void)
|
|
{
|
|
rbd_assert(!rbd_img_request_cache);
|
|
rbd_img_request_cache = kmem_cache_create("rbd_img_request",
|
|
sizeof (struct rbd_img_request),
|
|
__alignof__(struct rbd_img_request),
|
|
0, NULL);
|
|
if (!rbd_img_request_cache)
|
|
return -ENOMEM;
|
|
|
|
rbd_assert(!rbd_obj_request_cache);
|
|
rbd_obj_request_cache = kmem_cache_create("rbd_obj_request",
|
|
sizeof (struct rbd_obj_request),
|
|
__alignof__(struct rbd_obj_request),
|
|
0, NULL);
|
|
if (!rbd_obj_request_cache)
|
|
goto out_err;
|
|
|
|
rbd_assert(!rbd_segment_name_cache);
|
|
rbd_segment_name_cache = kmem_cache_create("rbd_segment_name",
|
|
MAX_OBJ_NAME_SIZE + 1, 1, 0, NULL);
|
|
if (rbd_segment_name_cache)
|
|
return 0;
|
|
out_err:
|
|
if (rbd_obj_request_cache) {
|
|
kmem_cache_destroy(rbd_obj_request_cache);
|
|
rbd_obj_request_cache = NULL;
|
|
}
|
|
|
|
kmem_cache_destroy(rbd_img_request_cache);
|
|
rbd_img_request_cache = NULL;
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void rbd_slab_exit(void)
|
|
{
|
|
rbd_assert(rbd_segment_name_cache);
|
|
kmem_cache_destroy(rbd_segment_name_cache);
|
|
rbd_segment_name_cache = NULL;
|
|
|
|
rbd_assert(rbd_obj_request_cache);
|
|
kmem_cache_destroy(rbd_obj_request_cache);
|
|
rbd_obj_request_cache = NULL;
|
|
|
|
rbd_assert(rbd_img_request_cache);
|
|
kmem_cache_destroy(rbd_img_request_cache);
|
|
rbd_img_request_cache = NULL;
|
|
}
|
|
|
|
static int __init rbd_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!libceph_compatible(NULL)) {
|
|
rbd_warn(NULL, "libceph incompatibility (quitting)");
|
|
|
|
return -EINVAL;
|
|
}
|
|
rc = rbd_slab_init();
|
|
if (rc)
|
|
return rc;
|
|
rc = rbd_sysfs_init();
|
|
if (rc)
|
|
rbd_slab_exit();
|
|
else
|
|
pr_info("loaded " RBD_DRV_NAME_LONG "\n");
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit rbd_exit(void)
|
|
{
|
|
rbd_sysfs_cleanup();
|
|
rbd_slab_exit();
|
|
}
|
|
|
|
module_init(rbd_init);
|
|
module_exit(rbd_exit);
|
|
|
|
MODULE_AUTHOR("Alex Elder <elder@inktank.com>");
|
|
MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
|
|
MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
|
|
MODULE_DESCRIPTION("rados block device");
|
|
|
|
/* following authorship retained from original osdblk.c */
|
|
MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
|
|
|
|
MODULE_LICENSE("GPL");
|