2011-07-31 08:52:39 +08:00
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/*
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* linux/fs/nfs/blocklayout/blocklayout.c
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*
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* Module for the NFSv4.1 pNFS block layout driver.
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*
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* Copyright (c) 2006 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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* Fred Isaman <iisaman@umich.edu>
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*
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* permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the university of michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. if
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* the above copyright notice or any other identification of the
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* university of michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the
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* university of michigan as to its fitness for any purpose, and without
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* warranty by the university of michigan of any kind, either express
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* or implied, including without limitation the implied warranties of
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* merchantability and fitness for a particular purpose. the regents
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* of the university of michigan shall not be liable for any damages,
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* including special, indirect, incidental, or consequential damages,
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* with respect to any claim arising out or in connection with the use
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* of the software, even if it has been or is hereafter advised of the
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* possibility of such damages.
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*/
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2011-07-31 08:52:53 +08:00
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2011-07-31 08:52:39 +08:00
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#include <linux/module.h>
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#include <linux/init.h>
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2011-07-31 08:52:42 +08:00
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#include <linux/mount.h>
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#include <linux/namei.h>
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2011-07-31 08:52:53 +08:00
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#include <linux/bio.h> /* struct bio */
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2011-08-02 15:57:35 +08:00
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#include <linux/prefetch.h>
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2012-09-25 14:55:57 +08:00
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#include <linux/pagevec.h>
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2011-07-31 08:52:39 +08:00
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2012-04-10 10:33:39 +08:00
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#include "../pnfs.h"
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2012-11-27 03:20:49 +08:00
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#include "../nfs4session.h"
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2012-04-10 10:33:39 +08:00
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#include "../internal.h"
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2011-07-31 08:52:39 +08:00
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#include "blocklayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
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MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
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2014-09-10 23:23:34 +08:00
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static bool is_hole(struct pnfs_block_extent *be)
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2011-07-31 08:52:53 +08:00
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{
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2014-09-10 23:23:34 +08:00
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switch (be->be_state) {
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case PNFS_BLOCK_NONE_DATA:
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return true;
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case PNFS_BLOCK_INVALID_DATA:
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return be->be_tag ? false : true;
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default:
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return false;
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}
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2011-07-31 08:52:54 +08:00
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}
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2011-07-31 08:52:53 +08:00
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/* The data we are handed might be spread across several bios. We need
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* to track when the last one is finished.
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*/
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struct parallel_io {
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struct kref refcnt;
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2014-09-10 23:23:34 +08:00
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void (*pnfs_callback) (void *data);
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2011-07-31 08:52:53 +08:00
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void *data;
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};
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static inline struct parallel_io *alloc_parallel(void *data)
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{
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struct parallel_io *rv;
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rv = kmalloc(sizeof(*rv), GFP_NOFS);
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if (rv) {
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rv->data = data;
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kref_init(&rv->refcnt);
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}
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return rv;
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}
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static inline void get_parallel(struct parallel_io *p)
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{
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kref_get(&p->refcnt);
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}
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static void destroy_parallel(struct kref *kref)
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{
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struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
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dprintk("%s enter\n", __func__);
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2014-09-10 23:23:34 +08:00
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p->pnfs_callback(p->data);
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2011-07-31 08:52:53 +08:00
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kfree(p);
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}
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static inline void put_parallel(struct parallel_io *p)
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{
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kref_put(&p->refcnt, destroy_parallel);
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}
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static struct bio *
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bl_submit_bio(int rw, struct bio *bio)
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{
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if (bio) {
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get_parallel(bio->bi_private);
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dprintk("%s submitting %s bio %u@%llu\n", __func__,
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2013-10-12 06:44:27 +08:00
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rw == READ ? "read" : "write", bio->bi_iter.bi_size,
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(unsigned long long)bio->bi_iter.bi_sector);
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2011-07-31 08:52:53 +08:00
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submit_bio(rw, bio);
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}
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return NULL;
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}
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static struct bio *bl_alloc_init_bio(int npg, sector_t isect,
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struct pnfs_block_extent *be,
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void (*end_io)(struct bio *, int err),
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struct parallel_io *par)
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{
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struct bio *bio;
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2012-01-12 23:18:48 +08:00
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npg = min(npg, BIO_MAX_PAGES);
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2011-07-31 08:52:53 +08:00
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bio = bio_alloc(GFP_NOIO, npg);
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2012-01-12 23:18:48 +08:00
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if (!bio && (current->flags & PF_MEMALLOC)) {
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while (!bio && (npg /= 2))
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bio = bio_alloc(GFP_NOIO, npg);
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}
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2011-07-31 08:52:53 +08:00
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2012-01-12 23:18:48 +08:00
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if (bio) {
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2013-10-12 06:44:27 +08:00
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bio->bi_iter.bi_sector = isect - be->be_f_offset +
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be->be_v_offset;
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2012-01-12 23:18:48 +08:00
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bio->bi_bdev = be->be_mdev;
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bio->bi_end_io = end_io;
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bio->bi_private = par;
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}
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2011-07-31 08:52:53 +08:00
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return bio;
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}
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2012-08-24 00:27:51 +08:00
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static struct bio *do_add_page_to_bio(struct bio *bio, int npg, int rw,
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2011-07-31 08:52:53 +08:00
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sector_t isect, struct page *page,
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struct pnfs_block_extent *be,
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void (*end_io)(struct bio *, int err),
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2012-08-24 00:27:51 +08:00
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struct parallel_io *par,
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unsigned int offset, int len)
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2011-07-31 08:52:53 +08:00
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{
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2012-08-24 00:27:51 +08:00
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isect = isect + (offset >> SECTOR_SHIFT);
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dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__,
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npg, rw, (unsigned long long)isect, offset, len);
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2011-07-31 08:52:53 +08:00
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retry:
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if (!bio) {
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bio = bl_alloc_init_bio(npg, isect, be, end_io, par);
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if (!bio)
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return ERR_PTR(-ENOMEM);
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}
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2012-08-24 00:27:51 +08:00
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if (bio_add_page(bio, page, len, offset) < len) {
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2011-07-31 08:52:53 +08:00
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bio = bl_submit_bio(rw, bio);
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goto retry;
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}
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return bio;
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}
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static void bl_end_io_read(struct bio *bio, int err)
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{
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struct parallel_io *par = bio->bi_private;
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2013-11-08 04:20:26 +08:00
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if (err) {
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2014-06-09 23:48:35 +08:00
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struct nfs_pgio_header *header = par->data;
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2012-04-21 02:47:44 +08:00
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if (!header->pnfs_error)
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header->pnfs_error = -EIO;
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pnfs_set_lo_fail(header->lseg);
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2011-07-31 08:52:53 +08:00
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}
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2014-09-10 23:23:33 +08:00
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2011-07-31 08:52:53 +08:00
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bio_put(bio);
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put_parallel(par);
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}
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static void bl_read_cleanup(struct work_struct *work)
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{
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struct rpc_task *task;
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2014-06-09 23:48:35 +08:00
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struct nfs_pgio_header *hdr;
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2011-07-31 08:52:53 +08:00
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dprintk("%s enter\n", __func__);
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task = container_of(work, struct rpc_task, u.tk_work);
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2014-06-09 23:48:35 +08:00
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hdr = container_of(task, struct nfs_pgio_header, task);
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pnfs_ld_read_done(hdr);
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2011-07-31 08:52:53 +08:00
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}
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static void
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2014-09-10 23:23:34 +08:00
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bl_end_par_io_read(void *data)
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2011-07-31 08:52:53 +08:00
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{
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2014-06-09 23:48:35 +08:00
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struct nfs_pgio_header *hdr = data;
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2011-07-31 08:52:53 +08:00
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2014-06-09 23:48:35 +08:00
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hdr->task.tk_status = hdr->pnfs_error;
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INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup);
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schedule_work(&hdr->task.u.tk_work);
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2011-07-31 08:52:53 +08:00
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}
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2011-07-31 08:52:39 +08:00
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static enum pnfs_try_status
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2014-09-10 23:23:34 +08:00
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bl_read_pagelist(struct nfs_pgio_header *header)
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2011-07-31 08:52:39 +08:00
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{
|
2014-09-10 23:23:34 +08:00
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struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
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2011-07-31 08:52:53 +08:00
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struct bio *bio = NULL;
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2014-09-10 23:23:34 +08:00
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struct pnfs_block_extent be;
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2011-07-31 08:52:53 +08:00
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sector_t isect, extent_length = 0;
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struct parallel_io *par;
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2014-09-10 23:23:34 +08:00
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loff_t f_offset = header->args.offset;
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size_t bytes_left = header->args.count;
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2012-08-24 00:27:52 +08:00
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unsigned int pg_offset, pg_len;
|
2014-09-10 23:23:34 +08:00
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struct page **pages = header->args.pages;
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int pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT;
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2012-08-24 00:27:52 +08:00
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const bool is_dio = (header->dreq != NULL);
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2014-08-22 00:09:28 +08:00
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struct blk_plug plug;
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2014-09-10 23:23:34 +08:00
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int i;
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2011-07-31 08:52:53 +08:00
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2012-03-21 02:12:46 +08:00
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dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__,
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2014-09-10 23:23:34 +08:00
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header->page_array.npages, f_offset,
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(unsigned int)header->args.count);
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2011-07-31 08:52:53 +08:00
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2014-09-10 23:23:34 +08:00
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par = alloc_parallel(header);
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2011-07-31 08:52:53 +08:00
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if (!par)
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2014-09-10 23:23:34 +08:00
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return PNFS_NOT_ATTEMPTED;
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2011-07-31 08:52:53 +08:00
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par->pnfs_callback = bl_end_par_io_read;
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|
2014-08-22 00:09:28 +08:00
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blk_start_plug(&plug);
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2011-07-31 08:52:53 +08:00
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isect = (sector_t) (f_offset >> SECTOR_SHIFT);
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/* Code assumes extents are page-aligned */
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2014-09-10 23:23:34 +08:00
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for (i = pg_index; i < header->page_array.npages; i++) {
|
2014-08-22 00:09:29 +08:00
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if (extent_length <= 0) {
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2011-07-31 08:52:53 +08:00
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/* We've used up the previous extent */
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bio = bl_submit_bio(READ, bio);
|
2014-09-10 23:23:34 +08:00
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|
2011-07-31 08:52:53 +08:00
|
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/* Get the next one */
|
2014-09-10 23:23:34 +08:00
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if (!ext_tree_lookup(bl, isect, &be, false)) {
|
2012-04-21 02:47:44 +08:00
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header->pnfs_error = -EIO;
|
2011-07-31 08:52:53 +08:00
|
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goto out;
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}
|
2014-09-10 23:23:34 +08:00
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extent_length = be.be_length - (isect - be.be_f_offset);
|
2011-07-31 08:52:53 +08:00
|
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}
|
2012-08-24 00:27:52 +08:00
|
|
|
|
2014-09-10 23:23:32 +08:00
|
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pg_offset = f_offset & ~PAGE_CACHE_MASK;
|
2012-08-24 00:27:52 +08:00
|
|
|
if (is_dio) {
|
|
|
|
if (pg_offset + bytes_left > PAGE_CACHE_SIZE)
|
|
|
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pg_len = PAGE_CACHE_SIZE - pg_offset;
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|
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else
|
|
|
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pg_len = bytes_left;
|
|
|
|
|
|
|
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f_offset += pg_len;
|
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|
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bytes_left -= pg_len;
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|
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isect += (pg_offset >> SECTOR_SHIFT);
|
2014-08-22 00:09:29 +08:00
|
|
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extent_length -= (pg_offset >> SECTOR_SHIFT);
|
2012-08-24 00:27:52 +08:00
|
|
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} else {
|
2014-09-10 23:23:32 +08:00
|
|
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BUG_ON(pg_offset != 0);
|
2012-08-24 00:27:52 +08:00
|
|
|
pg_len = PAGE_CACHE_SIZE;
|
|
|
|
}
|
|
|
|
|
2014-09-10 23:23:34 +08:00
|
|
|
if (is_hole(&be)) {
|
2011-07-31 08:52:53 +08:00
|
|
|
bio = bl_submit_bio(READ, bio);
|
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|
|
/* Fill hole w/ zeroes w/o accessing device */
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|
|
dprintk("%s Zeroing page for hole\n", __func__);
|
2012-08-24 00:27:52 +08:00
|
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|
zero_user_segment(pages[i], pg_offset, pg_len);
|
2011-07-31 08:52:53 +08:00
|
|
|
} else {
|
2014-06-09 23:48:34 +08:00
|
|
|
bio = do_add_page_to_bio(bio,
|
2014-09-10 23:23:34 +08:00
|
|
|
header->page_array.npages - i,
|
2012-04-21 02:47:45 +08:00
|
|
|
READ,
|
2014-09-10 23:23:34 +08:00
|
|
|
isect, pages[i], &be,
|
2012-08-24 00:27:52 +08:00
|
|
|
bl_end_io_read, par,
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|
|
|
pg_offset, pg_len);
|
2011-07-31 08:52:53 +08:00
|
|
|
if (IS_ERR(bio)) {
|
2012-04-21 02:47:44 +08:00
|
|
|
header->pnfs_error = PTR_ERR(bio);
|
2011-09-23 09:50:16 +08:00
|
|
|
bio = NULL;
|
2011-07-31 08:52:53 +08:00
|
|
|
goto out;
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|
|
|
}
|
|
|
|
}
|
2012-08-24 00:27:52 +08:00
|
|
|
isect += (pg_len >> SECTOR_SHIFT);
|
2014-08-22 00:09:29 +08:00
|
|
|
extent_length -= (pg_len >> SECTOR_SHIFT);
|
2011-07-31 08:52:53 +08:00
|
|
|
}
|
2012-04-21 02:47:44 +08:00
|
|
|
if ((isect << SECTOR_SHIFT) >= header->inode->i_size) {
|
2014-09-10 23:23:34 +08:00
|
|
|
header->res.eof = 1;
|
|
|
|
header->res.count = header->inode->i_size - header->args.offset;
|
2011-07-31 08:52:53 +08:00
|
|
|
} else {
|
2014-09-10 23:23:34 +08:00
|
|
|
header->res.count = (isect << SECTOR_SHIFT) - header->args.offset;
|
2011-07-31 08:52:53 +08:00
|
|
|
}
|
|
|
|
out:
|
|
|
|
bl_submit_bio(READ, bio);
|
2014-08-22 00:09:28 +08:00
|
|
|
blk_finish_plug(&plug);
|
2011-07-31 08:52:53 +08:00
|
|
|
put_parallel(par);
|
|
|
|
return PNFS_ATTEMPTED;
|
2011-07-31 08:52:55 +08:00
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:54 +08:00
|
|
|
static void bl_end_io_write(struct bio *bio, int err)
|
|
|
|
{
|
|
|
|
struct parallel_io *par = bio->bi_private;
|
|
|
|
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
2014-06-09 23:48:35 +08:00
|
|
|
struct nfs_pgio_header *header = par->data;
|
2011-07-31 08:52:54 +08:00
|
|
|
|
|
|
|
if (!uptodate) {
|
2012-04-21 02:47:44 +08:00
|
|
|
if (!header->pnfs_error)
|
|
|
|
header->pnfs_error = -EIO;
|
|
|
|
pnfs_set_lo_fail(header->lseg);
|
2011-07-31 08:52:54 +08:00
|
|
|
}
|
|
|
|
bio_put(bio);
|
|
|
|
put_parallel(par);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Function scheduled for call during bl_end_par_io_write,
|
|
|
|
* it marks sectors as written and extends the commitlist.
|
|
|
|
*/
|
|
|
|
static void bl_write_cleanup(struct work_struct *work)
|
|
|
|
{
|
2014-09-10 23:23:34 +08:00
|
|
|
struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work);
|
|
|
|
struct nfs_pgio_header *hdr =
|
|
|
|
container_of(task, struct nfs_pgio_header, task);
|
|
|
|
|
2011-07-31 08:52:54 +08:00
|
|
|
dprintk("%s enter\n", __func__);
|
2014-09-10 23:23:34 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
if (likely(!hdr->pnfs_error)) {
|
2014-09-10 23:23:34 +08:00
|
|
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg);
|
|
|
|
u64 start = hdr->args.offset & (loff_t)PAGE_CACHE_MASK;
|
|
|
|
u64 end = (hdr->args.offset + hdr->args.count +
|
|
|
|
PAGE_CACHE_SIZE - 1) & (loff_t)PAGE_CACHE_MASK;
|
|
|
|
|
|
|
|
ext_tree_mark_written(bl, start >> SECTOR_SHIFT,
|
|
|
|
(end - start) >> SECTOR_SHIFT);
|
2011-07-31 08:52:55 +08:00
|
|
|
}
|
2014-09-10 23:23:34 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
pnfs_ld_write_done(hdr);
|
2011-07-31 08:52:54 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Called when last of bios associated with a bl_write_pagelist call finishes */
|
2014-09-10 23:23:34 +08:00
|
|
|
static void bl_end_par_io_write(void *data)
|
2011-07-31 08:52:54 +08:00
|
|
|
{
|
2014-06-09 23:48:35 +08:00
|
|
|
struct nfs_pgio_header *hdr = data;
|
2011-07-31 08:52:54 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
hdr->task.tk_status = hdr->pnfs_error;
|
2014-06-09 23:48:36 +08:00
|
|
|
hdr->verf.committed = NFS_FILE_SYNC;
|
2014-06-09 23:48:35 +08:00
|
|
|
INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup);
|
|
|
|
schedule_work(&hdr->task.u.tk_work);
|
2011-07-31 08:52:54 +08:00
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
static enum pnfs_try_status
|
2014-06-09 23:48:35 +08:00
|
|
|
bl_write_pagelist(struct nfs_pgio_header *header, int sync)
|
2011-07-31 08:52:39 +08:00
|
|
|
{
|
2014-09-10 23:23:34 +08:00
|
|
|
struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg);
|
2011-07-31 08:52:54 +08:00
|
|
|
struct bio *bio = NULL;
|
2014-09-10 23:23:34 +08:00
|
|
|
struct pnfs_block_extent be;
|
2014-09-10 23:23:32 +08:00
|
|
|
sector_t isect, extent_length = 0;
|
2012-08-24 00:27:53 +08:00
|
|
|
struct parallel_io *par = NULL;
|
2014-06-09 23:48:35 +08:00
|
|
|
loff_t offset = header->args.offset;
|
|
|
|
size_t count = header->args.count;
|
|
|
|
struct page **pages = header->args.pages;
|
2014-09-10 23:23:32 +08:00
|
|
|
int pg_index = pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT;
|
2014-08-22 00:09:28 +08:00
|
|
|
struct blk_plug plug;
|
2014-09-10 23:23:34 +08:00
|
|
|
int i;
|
2011-07-31 08:52:54 +08:00
|
|
|
|
|
|
|
dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
|
2012-08-24 00:27:53 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
/* At this point, header->page_aray is a (sequential) list of nfs_pages.
|
2011-07-31 08:52:56 +08:00
|
|
|
* We want to write each, and if there is an error set pnfs_error
|
|
|
|
* to have it redone using nfs.
|
2011-07-31 08:52:54 +08:00
|
|
|
*/
|
2014-06-09 23:48:35 +08:00
|
|
|
par = alloc_parallel(header);
|
2011-07-31 08:52:54 +08:00
|
|
|
if (!par)
|
2014-09-10 23:23:34 +08:00
|
|
|
return PNFS_NOT_ATTEMPTED;
|
2011-07-31 08:52:54 +08:00
|
|
|
par->pnfs_callback = bl_end_par_io_write;
|
|
|
|
|
2014-09-10 23:23:32 +08:00
|
|
|
blk_start_plug(&plug);
|
2011-07-31 08:52:56 +08:00
|
|
|
|
2014-09-10 23:23:32 +08:00
|
|
|
/* we always write out the whole page */
|
|
|
|
offset = offset & (loff_t)PAGE_CACHE_MASK;
|
|
|
|
isect = offset >> SECTOR_SHIFT;
|
2011-07-31 08:52:56 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
for (i = pg_index; i < header->page_array.npages; i++) {
|
2014-08-22 00:09:29 +08:00
|
|
|
if (extent_length <= 0) {
|
2011-07-31 08:52:54 +08:00
|
|
|
/* We've used up the previous extent */
|
|
|
|
bio = bl_submit_bio(WRITE, bio);
|
|
|
|
/* Get the next one */
|
2014-09-10 23:23:34 +08:00
|
|
|
if (!ext_tree_lookup(bl, isect, &be, true)) {
|
2012-04-21 02:47:44 +08:00
|
|
|
header->pnfs_error = -EINVAL;
|
2011-07-31 08:52:54 +08:00
|
|
|
goto out;
|
|
|
|
}
|
2012-08-24 00:27:51 +08:00
|
|
|
|
2014-09-10 23:23:34 +08:00
|
|
|
extent_length = be.be_length - (isect - be.be_f_offset);
|
2011-07-31 08:52:56 +08:00
|
|
|
}
|
2012-08-24 00:27:51 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
bio = do_add_page_to_bio(bio, header->page_array.npages - i,
|
2014-09-10 23:23:34 +08:00
|
|
|
WRITE, isect, pages[i], &be,
|
2012-08-24 00:27:51 +08:00
|
|
|
bl_end_io_write, par,
|
2014-09-10 23:23:32 +08:00
|
|
|
0, PAGE_CACHE_SIZE);
|
2011-07-31 08:52:56 +08:00
|
|
|
if (IS_ERR(bio)) {
|
2012-04-21 02:47:44 +08:00
|
|
|
header->pnfs_error = PTR_ERR(bio);
|
2011-09-23 09:50:16 +08:00
|
|
|
bio = NULL;
|
2011-07-31 08:52:56 +08:00
|
|
|
goto out;
|
2011-07-31 08:52:54 +08:00
|
|
|
}
|
2014-09-10 23:23:32 +08:00
|
|
|
offset += PAGE_CACHE_SIZE;
|
|
|
|
count -= PAGE_CACHE_SIZE;
|
2011-07-31 08:52:54 +08:00
|
|
|
isect += PAGE_CACHE_SECTORS;
|
|
|
|
extent_length -= PAGE_CACHE_SECTORS;
|
|
|
|
}
|
2011-07-31 08:52:56 +08:00
|
|
|
|
2014-06-09 23:48:35 +08:00
|
|
|
header->res.count = header->args.count;
|
2011-07-31 08:52:54 +08:00
|
|
|
out:
|
|
|
|
bl_submit_bio(WRITE, bio);
|
2014-08-22 00:09:28 +08:00
|
|
|
blk_finish_plug(&plug);
|
2011-07-31 08:52:54 +08:00
|
|
|
put_parallel(par);
|
|
|
|
return PNFS_ATTEMPTED;
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
|
|
|
|
{
|
|
|
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
|
2014-09-10 23:23:34 +08:00
|
|
|
int err;
|
2011-07-31 08:52:39 +08:00
|
|
|
|
|
|
|
dprintk("%s enter\n", __func__);
|
2014-09-10 23:23:34 +08:00
|
|
|
|
|
|
|
err = ext_tree_remove(bl, true, 0, LLONG_MAX);
|
|
|
|
WARN_ON(err);
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
kfree(bl);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
|
|
|
|
gfp_t gfp_flags)
|
|
|
|
{
|
|
|
|
struct pnfs_block_layout *bl;
|
|
|
|
|
|
|
|
dprintk("%s enter\n", __func__);
|
|
|
|
bl = kzalloc(sizeof(*bl), gfp_flags);
|
|
|
|
if (!bl)
|
|
|
|
return NULL;
|
2014-09-10 23:23:34 +08:00
|
|
|
|
|
|
|
bl->bl_ext_rw = RB_ROOT;
|
|
|
|
bl->bl_ext_ro = RB_ROOT;
|
2011-07-31 08:52:39 +08:00
|
|
|
spin_lock_init(&bl->bl_ext_lock);
|
2014-09-10 23:23:34 +08:00
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
return &bl->bl_layout;
|
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:44 +08:00
|
|
|
static void bl_free_lseg(struct pnfs_layout_segment *lseg)
|
2011-07-31 08:52:39 +08:00
|
|
|
{
|
2011-07-31 08:52:44 +08:00
|
|
|
dprintk("%s enter\n", __func__);
|
|
|
|
kfree(lseg);
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:44 +08:00
|
|
|
/* We pretty much ignore lseg, and store all data layout wide, so we
|
|
|
|
* can correctly merge.
|
|
|
|
*/
|
|
|
|
static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
|
|
|
|
struct nfs4_layoutget_res *lgr,
|
|
|
|
gfp_t gfp_flags)
|
2011-07-31 08:52:39 +08:00
|
|
|
{
|
2011-07-31 08:52:44 +08:00
|
|
|
struct pnfs_layout_segment *lseg;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
dprintk("%s enter\n", __func__);
|
|
|
|
lseg = kzalloc(sizeof(*lseg), gfp_flags);
|
|
|
|
if (!lseg)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
|
|
|
|
if (status) {
|
|
|
|
/* We don't want to call the full-blown bl_free_lseg,
|
|
|
|
* since on error extents were not touched.
|
|
|
|
*/
|
|
|
|
kfree(lseg);
|
|
|
|
return ERR_PTR(status);
|
|
|
|
}
|
|
|
|
return lseg;
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
2014-09-10 23:23:35 +08:00
|
|
|
static void
|
|
|
|
bl_return_range(struct pnfs_layout_hdr *lo,
|
|
|
|
struct pnfs_layout_range *range)
|
|
|
|
{
|
|
|
|
struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
|
|
|
|
sector_t offset = range->offset >> SECTOR_SHIFT, end;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (range->offset % 8) {
|
|
|
|
dprintk("%s: offset %lld not block size aligned\n",
|
|
|
|
__func__, range->offset);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (range->length != NFS4_MAX_UINT64) {
|
|
|
|
if (range->length % 8) {
|
|
|
|
dprintk("%s: length %lld not block size aligned\n",
|
|
|
|
__func__, range->length);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
end = offset + (range->length >> SECTOR_SHIFT);
|
|
|
|
} else {
|
|
|
|
end = round_down(NFS4_MAX_UINT64, PAGE_SIZE);
|
|
|
|
}
|
|
|
|
|
|
|
|
err = ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end);
|
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
static void
|
|
|
|
bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
|
|
|
|
const struct nfs4_layoutcommit_args *arg)
|
|
|
|
{
|
2011-07-31 08:52:51 +08:00
|
|
|
dprintk("%s enter\n", __func__);
|
2014-09-10 23:23:34 +08:00
|
|
|
ext_tree_encode_commit(BLK_LO2EXT(lo), xdr);
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
|
|
|
|
{
|
2011-07-31 08:52:52 +08:00
|
|
|
struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout;
|
|
|
|
|
|
|
|
dprintk("%s enter\n", __func__);
|
2014-09-10 23:23:34 +08:00
|
|
|
ext_tree_mark_committed(BLK_LO2EXT(lo), lcdata->res.status);
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:46 +08:00
|
|
|
static void free_blk_mountid(struct block_mount_id *mid)
|
|
|
|
{
|
|
|
|
if (mid) {
|
2012-01-12 23:18:47 +08:00
|
|
|
struct pnfs_block_dev *dev, *tmp;
|
|
|
|
|
|
|
|
/* No need to take bm_lock as we are last user freeing bm_devlist */
|
|
|
|
list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) {
|
2011-07-31 08:52:46 +08:00
|
|
|
list_del(&dev->bm_node);
|
|
|
|
bl_free_block_dev(dev);
|
|
|
|
}
|
|
|
|
kfree(mid);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-09-19 09:02:29 +08:00
|
|
|
/* This is mostly copied from the filelayout_get_device_info function.
|
2011-07-31 08:52:46 +08:00
|
|
|
* It seems much of this should be at the generic pnfs level.
|
|
|
|
*/
|
|
|
|
static struct pnfs_block_dev *
|
|
|
|
nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
|
|
|
|
struct nfs4_deviceid *d_id)
|
|
|
|
{
|
|
|
|
struct pnfs_device *dev;
|
2011-09-23 09:50:08 +08:00
|
|
|
struct pnfs_block_dev *rv;
|
2011-07-31 08:52:46 +08:00
|
|
|
u32 max_resp_sz;
|
|
|
|
int max_pages;
|
|
|
|
struct page **pages = NULL;
|
|
|
|
int i, rc;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Use the session max response size as the basis for setting
|
|
|
|
* GETDEVICEINFO's maxcount
|
|
|
|
*/
|
|
|
|
max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
|
2012-04-10 10:33:39 +08:00
|
|
|
max_pages = nfs_page_array_len(0, max_resp_sz);
|
2011-07-31 08:52:46 +08:00
|
|
|
dprintk("%s max_resp_sz %u max_pages %d\n",
|
|
|
|
__func__, max_resp_sz, max_pages);
|
|
|
|
|
|
|
|
dev = kmalloc(sizeof(*dev), GFP_NOFS);
|
|
|
|
if (!dev) {
|
|
|
|
dprintk("%s kmalloc failed\n", __func__);
|
2011-09-23 09:50:08 +08:00
|
|
|
return ERR_PTR(-ENOMEM);
|
2011-07-31 08:52:46 +08:00
|
|
|
}
|
|
|
|
|
2014-06-26 02:26:21 +08:00
|
|
|
pages = kcalloc(max_pages, sizeof(struct page *), GFP_NOFS);
|
2011-07-31 08:52:46 +08:00
|
|
|
if (pages == NULL) {
|
|
|
|
kfree(dev);
|
2011-09-23 09:50:08 +08:00
|
|
|
return ERR_PTR(-ENOMEM);
|
2011-07-31 08:52:46 +08:00
|
|
|
}
|
|
|
|
for (i = 0; i < max_pages; i++) {
|
|
|
|
pages[i] = alloc_page(GFP_NOFS);
|
2011-09-23 09:50:08 +08:00
|
|
|
if (!pages[i]) {
|
|
|
|
rv = ERR_PTR(-ENOMEM);
|
2011-07-31 08:52:46 +08:00
|
|
|
goto out_free;
|
2011-09-23 09:50:08 +08:00
|
|
|
}
|
2011-07-31 08:52:46 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(&dev->dev_id, d_id, sizeof(*d_id));
|
|
|
|
dev->layout_type = LAYOUT_BLOCK_VOLUME;
|
|
|
|
dev->pages = pages;
|
|
|
|
dev->pgbase = 0;
|
|
|
|
dev->pglen = PAGE_SIZE * max_pages;
|
|
|
|
dev->mincount = 0;
|
2013-06-26 07:02:54 +08:00
|
|
|
dev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
|
2011-07-31 08:52:46 +08:00
|
|
|
|
|
|
|
dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
|
2013-05-20 23:42:54 +08:00
|
|
|
rc = nfs4_proc_getdeviceinfo(server, dev, NULL);
|
2011-07-31 08:52:46 +08:00
|
|
|
dprintk("%s getdevice info returns %d\n", __func__, rc);
|
2011-09-23 09:50:08 +08:00
|
|
|
if (rc) {
|
|
|
|
rv = ERR_PTR(rc);
|
2011-07-31 08:52:46 +08:00
|
|
|
goto out_free;
|
2011-09-23 09:50:08 +08:00
|
|
|
}
|
2011-07-31 08:52:46 +08:00
|
|
|
|
|
|
|
rv = nfs4_blk_decode_device(server, dev);
|
|
|
|
out_free:
|
|
|
|
for (i = 0; i < max_pages; i++)
|
|
|
|
__free_page(pages[i]);
|
|
|
|
kfree(pages);
|
|
|
|
kfree(dev);
|
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
static int
|
|
|
|
bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
|
|
|
|
{
|
2011-07-31 08:52:46 +08:00
|
|
|
struct block_mount_id *b_mt_id = NULL;
|
|
|
|
struct pnfs_devicelist *dlist = NULL;
|
|
|
|
struct pnfs_block_dev *bdev;
|
|
|
|
LIST_HEAD(block_disklist);
|
2011-09-23 09:50:08 +08:00
|
|
|
int status, i;
|
2011-07-31 08:52:46 +08:00
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
dprintk("%s enter\n", __func__);
|
2011-07-31 08:52:46 +08:00
|
|
|
|
|
|
|
if (server->pnfs_blksize == 0) {
|
|
|
|
dprintk("%s Server did not return blksize\n", __func__);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2014-08-22 00:09:26 +08:00
|
|
|
if (server->pnfs_blksize > PAGE_SIZE) {
|
|
|
|
printk(KERN_ERR "%s: pNFS blksize %d not supported.\n",
|
|
|
|
__func__, server->pnfs_blksize);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:46 +08:00
|
|
|
b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS);
|
|
|
|
if (!b_mt_id) {
|
|
|
|
status = -ENOMEM;
|
|
|
|
goto out_error;
|
|
|
|
}
|
|
|
|
/* Initialize nfs4 block layout mount id */
|
|
|
|
spin_lock_init(&b_mt_id->bm_lock);
|
|
|
|
INIT_LIST_HEAD(&b_mt_id->bm_devlist);
|
|
|
|
|
|
|
|
dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
|
|
|
|
if (!dlist) {
|
|
|
|
status = -ENOMEM;
|
|
|
|
goto out_error;
|
|
|
|
}
|
|
|
|
dlist->eof = 0;
|
|
|
|
while (!dlist->eof) {
|
|
|
|
status = nfs4_proc_getdevicelist(server, fh, dlist);
|
|
|
|
if (status)
|
|
|
|
goto out_error;
|
|
|
|
dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
|
|
|
|
__func__, dlist->num_devs, dlist->eof);
|
|
|
|
for (i = 0; i < dlist->num_devs; i++) {
|
|
|
|
bdev = nfs4_blk_get_deviceinfo(server, fh,
|
|
|
|
&dlist->dev_id[i]);
|
2011-09-23 09:50:08 +08:00
|
|
|
if (IS_ERR(bdev)) {
|
|
|
|
status = PTR_ERR(bdev);
|
2011-07-31 08:52:46 +08:00
|
|
|
goto out_error;
|
|
|
|
}
|
|
|
|
spin_lock(&b_mt_id->bm_lock);
|
|
|
|
list_add(&bdev->bm_node, &b_mt_id->bm_devlist);
|
|
|
|
spin_unlock(&b_mt_id->bm_lock);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
dprintk("%s SUCCESS\n", __func__);
|
|
|
|
server->pnfs_ld_data = b_mt_id;
|
|
|
|
|
|
|
|
out_return:
|
|
|
|
kfree(dlist);
|
|
|
|
return status;
|
|
|
|
|
|
|
|
out_error:
|
|
|
|
free_blk_mountid(b_mt_id);
|
|
|
|
goto out_return;
|
2011-07-31 08:52:39 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
bl_clear_layoutdriver(struct nfs_server *server)
|
|
|
|
{
|
2011-07-31 08:52:46 +08:00
|
|
|
struct block_mount_id *b_mt_id = server->pnfs_ld_data;
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
dprintk("%s enter\n", __func__);
|
2011-07-31 08:52:46 +08:00
|
|
|
free_blk_mountid(b_mt_id);
|
|
|
|
dprintk("%s RETURNS\n", __func__);
|
2011-07-31 08:52:39 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-08-24 00:27:52 +08:00
|
|
|
static bool
|
2014-09-10 23:23:32 +08:00
|
|
|
is_aligned_req(struct nfs_pageio_descriptor *pgio,
|
|
|
|
struct nfs_page *req, unsigned int alignment)
|
2012-08-24 00:27:52 +08:00
|
|
|
{
|
2014-09-10 23:23:32 +08:00
|
|
|
/*
|
|
|
|
* Always accept buffered writes, higher layers take care of the
|
|
|
|
* right alignment.
|
|
|
|
*/
|
|
|
|
if (pgio->pg_dreq == NULL)
|
|
|
|
return true;
|
|
|
|
|
|
|
|
if (!IS_ALIGNED(req->wb_offset, alignment))
|
|
|
|
return false;
|
|
|
|
|
|
|
|
if (IS_ALIGNED(req->wb_bytes, alignment))
|
|
|
|
return true;
|
|
|
|
|
|
|
|
if (req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode)) {
|
|
|
|
/*
|
|
|
|
* If the write goes up to the inode size, just write
|
|
|
|
* the full page. Data past the inode size is
|
|
|
|
* guaranteed to be zeroed by the higher level client
|
|
|
|
* code, and this behaviour is mandated by RFC 5663
|
|
|
|
* section 2.3.2.
|
|
|
|
*/
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
2012-08-24 00:27:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
|
|
|
{
|
2014-09-10 23:23:32 +08:00
|
|
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE)) {
|
2012-08-24 00:27:52 +08:00
|
|
|
nfs_pageio_reset_read_mds(pgio);
|
2014-09-10 23:23:32 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
pnfs_generic_pg_init_read(pgio, req);
|
2012-08-24 00:27:52 +08:00
|
|
|
}
|
|
|
|
|
2014-05-15 23:56:43 +08:00
|
|
|
/*
|
|
|
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
|
|
|
|
* of bytes (maximum @req->wb_bytes) that can be coalesced.
|
|
|
|
*/
|
|
|
|
static size_t
|
2012-08-24 00:27:52 +08:00
|
|
|
bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
|
|
|
struct nfs_page *req)
|
|
|
|
{
|
2014-09-10 23:23:32 +08:00
|
|
|
if (!is_aligned_req(pgio, req, SECTOR_SIZE))
|
2014-05-15 23:56:43 +08:00
|
|
|
return 0;
|
2012-08-24 00:27:52 +08:00
|
|
|
return pnfs_generic_pg_test(pgio, prev, req);
|
|
|
|
}
|
|
|
|
|
2012-09-25 14:55:57 +08:00
|
|
|
/*
|
|
|
|
* Return the number of contiguous bytes for a given inode
|
|
|
|
* starting at page frame idx.
|
|
|
|
*/
|
|
|
|
static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
|
|
|
|
{
|
|
|
|
struct address_space *mapping = inode->i_mapping;
|
|
|
|
pgoff_t end;
|
|
|
|
|
|
|
|
/* Optimize common case that writes from 0 to end of file */
|
|
|
|
end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE);
|
|
|
|
if (end != NFS_I(inode)->npages) {
|
|
|
|
rcu_read_lock();
|
2014-04-04 05:47:44 +08:00
|
|
|
end = page_cache_next_hole(mapping, idx + 1, ULONG_MAX);
|
2012-09-25 14:55:57 +08:00
|
|
|
rcu_read_unlock();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!end)
|
|
|
|
return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT);
|
|
|
|
else
|
|
|
|
return (end - idx) << PAGE_CACHE_SHIFT;
|
|
|
|
}
|
|
|
|
|
2012-10-02 23:29:14 +08:00
|
|
|
static void
|
2012-08-24 00:27:53 +08:00
|
|
|
bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
|
|
|
|
{
|
2014-09-10 23:23:32 +08:00
|
|
|
u64 wb_size;
|
|
|
|
|
|
|
|
if (!is_aligned_req(pgio, req, PAGE_SIZE)) {
|
2012-08-24 00:27:53 +08:00
|
|
|
nfs_pageio_reset_write_mds(pgio);
|
2014-09-10 23:23:32 +08:00
|
|
|
return;
|
2012-09-25 14:55:57 +08:00
|
|
|
}
|
2014-09-10 23:23:32 +08:00
|
|
|
|
|
|
|
if (pgio->pg_dreq == NULL)
|
|
|
|
wb_size = pnfs_num_cont_bytes(pgio->pg_inode,
|
|
|
|
req->wb_index);
|
|
|
|
else
|
|
|
|
wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
|
|
|
|
|
|
|
|
pnfs_generic_pg_init_write(pgio, req, wb_size);
|
2012-08-24 00:27:53 +08:00
|
|
|
}
|
|
|
|
|
2014-05-15 23:56:43 +08:00
|
|
|
/*
|
|
|
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
|
|
|
|
* of bytes (maximum @req->wb_bytes) that can be coalesced.
|
|
|
|
*/
|
|
|
|
static size_t
|
2012-08-24 00:27:53 +08:00
|
|
|
bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
|
|
|
struct nfs_page *req)
|
|
|
|
{
|
2014-09-10 23:23:32 +08:00
|
|
|
if (!is_aligned_req(pgio, req, PAGE_SIZE))
|
2014-05-15 23:56:43 +08:00
|
|
|
return 0;
|
2012-08-24 00:27:53 +08:00
|
|
|
return pnfs_generic_pg_test(pgio, prev, req);
|
|
|
|
}
|
|
|
|
|
2011-07-31 08:52:40 +08:00
|
|
|
static const struct nfs_pageio_ops bl_pg_read_ops = {
|
2012-08-24 00:27:52 +08:00
|
|
|
.pg_init = bl_pg_init_read,
|
|
|
|
.pg_test = bl_pg_test_read,
|
2011-07-31 08:52:40 +08:00
|
|
|
.pg_doio = pnfs_generic_pg_readpages,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct nfs_pageio_ops bl_pg_write_ops = {
|
2012-08-24 00:27:53 +08:00
|
|
|
.pg_init = bl_pg_init_write,
|
|
|
|
.pg_test = bl_pg_test_write,
|
2011-07-31 08:52:40 +08:00
|
|
|
.pg_doio = pnfs_generic_pg_writepages,
|
|
|
|
};
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
static struct pnfs_layoutdriver_type blocklayout_type = {
|
|
|
|
.id = LAYOUT_BLOCK_VOLUME,
|
|
|
|
.name = "LAYOUT_BLOCK_VOLUME",
|
2013-02-04 21:15:02 +08:00
|
|
|
.owner = THIS_MODULE,
|
2014-09-10 23:23:36 +08:00
|
|
|
.flags = PNFS_LAYOUTRET_ON_SETATTR |
|
|
|
|
PNFS_READ_WHOLE_PAGE,
|
2011-07-31 08:52:39 +08:00
|
|
|
.read_pagelist = bl_read_pagelist,
|
|
|
|
.write_pagelist = bl_write_pagelist,
|
|
|
|
.alloc_layout_hdr = bl_alloc_layout_hdr,
|
|
|
|
.free_layout_hdr = bl_free_layout_hdr,
|
|
|
|
.alloc_lseg = bl_alloc_lseg,
|
|
|
|
.free_lseg = bl_free_lseg,
|
2014-09-10 23:23:35 +08:00
|
|
|
.return_range = bl_return_range,
|
2011-07-31 08:52:39 +08:00
|
|
|
.encode_layoutcommit = bl_encode_layoutcommit,
|
|
|
|
.cleanup_layoutcommit = bl_cleanup_layoutcommit,
|
|
|
|
.set_layoutdriver = bl_set_layoutdriver,
|
|
|
|
.clear_layoutdriver = bl_clear_layoutdriver,
|
2011-07-31 08:52:40 +08:00
|
|
|
.pg_read_ops = &bl_pg_read_ops,
|
|
|
|
.pg_write_ops = &bl_pg_write_ops,
|
2011-07-31 08:52:39 +08:00
|
|
|
};
|
|
|
|
|
2011-07-31 08:52:42 +08:00
|
|
|
static const struct rpc_pipe_ops bl_upcall_ops = {
|
2011-09-23 09:50:10 +08:00
|
|
|
.upcall = rpc_pipe_generic_upcall,
|
2011-07-31 08:52:42 +08:00
|
|
|
.downcall = bl_pipe_downcall,
|
|
|
|
.destroy_msg = bl_pipe_destroy_msg,
|
|
|
|
};
|
|
|
|
|
2012-01-10 21:04:16 +08:00
|
|
|
static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
|
|
|
|
struct rpc_pipe *pipe)
|
|
|
|
{
|
|
|
|
struct dentry *dir, *dentry;
|
|
|
|
|
|
|
|
dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
|
|
|
|
if (dir == NULL)
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
|
|
|
|
dput(dir);
|
|
|
|
return dentry;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nfs4blocklayout_unregister_sb(struct super_block *sb,
|
|
|
|
struct rpc_pipe *pipe)
|
|
|
|
{
|
|
|
|
if (pipe->dentry)
|
|
|
|
rpc_unlink(pipe->dentry);
|
|
|
|
}
|
|
|
|
|
2012-01-10 21:04:32 +08:00
|
|
|
static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
|
|
|
|
void *ptr)
|
|
|
|
{
|
|
|
|
struct super_block *sb = ptr;
|
|
|
|
struct net *net = sb->s_fs_info;
|
|
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
|
|
struct dentry *dentry;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (nn->bl_device_pipe == NULL) {
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (event) {
|
|
|
|
case RPC_PIPEFS_MOUNT:
|
|
|
|
dentry = nfs4blocklayout_register_sb(sb, nn->bl_device_pipe);
|
|
|
|
if (IS_ERR(dentry)) {
|
|
|
|
ret = PTR_ERR(dentry);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
nn->bl_device_pipe->dentry = dentry;
|
|
|
|
break;
|
|
|
|
case RPC_PIPEFS_UMOUNT:
|
|
|
|
if (nn->bl_device_pipe->dentry)
|
|
|
|
nfs4blocklayout_unregister_sb(sb, nn->bl_device_pipe);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = -ENOTSUPP;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block nfs4blocklayout_block = {
|
|
|
|
.notifier_call = rpc_pipefs_event,
|
|
|
|
};
|
|
|
|
|
2012-01-10 21:04:16 +08:00
|
|
|
static struct dentry *nfs4blocklayout_register_net(struct net *net,
|
|
|
|
struct rpc_pipe *pipe)
|
|
|
|
{
|
|
|
|
struct super_block *pipefs_sb;
|
|
|
|
struct dentry *dentry;
|
|
|
|
|
|
|
|
pipefs_sb = rpc_get_sb_net(net);
|
|
|
|
if (!pipefs_sb)
|
2012-01-10 21:04:40 +08:00
|
|
|
return NULL;
|
2012-01-10 21:04:16 +08:00
|
|
|
dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
|
|
|
|
rpc_put_sb_net(net);
|
|
|
|
return dentry;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nfs4blocklayout_unregister_net(struct net *net,
|
|
|
|
struct rpc_pipe *pipe)
|
|
|
|
{
|
|
|
|
struct super_block *pipefs_sb;
|
|
|
|
|
|
|
|
pipefs_sb = rpc_get_sb_net(net);
|
|
|
|
if (pipefs_sb) {
|
|
|
|
nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
|
|
|
|
rpc_put_sb_net(net);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-01-10 21:04:24 +08:00
|
|
|
static int nfs4blocklayout_net_init(struct net *net)
|
|
|
|
{
|
|
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
|
|
struct dentry *dentry;
|
|
|
|
|
2012-03-11 22:20:31 +08:00
|
|
|
init_waitqueue_head(&nn->bl_wq);
|
2012-01-10 21:04:24 +08:00
|
|
|
nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
|
|
|
|
if (IS_ERR(nn->bl_device_pipe))
|
|
|
|
return PTR_ERR(nn->bl_device_pipe);
|
|
|
|
dentry = nfs4blocklayout_register_net(net, nn->bl_device_pipe);
|
|
|
|
if (IS_ERR(dentry)) {
|
|
|
|
rpc_destroy_pipe_data(nn->bl_device_pipe);
|
|
|
|
return PTR_ERR(dentry);
|
|
|
|
}
|
|
|
|
nn->bl_device_pipe->dentry = dentry;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nfs4blocklayout_net_exit(struct net *net)
|
|
|
|
{
|
|
|
|
struct nfs_net *nn = net_generic(net, nfs_net_id);
|
|
|
|
|
|
|
|
nfs4blocklayout_unregister_net(net, nn->bl_device_pipe);
|
|
|
|
rpc_destroy_pipe_data(nn->bl_device_pipe);
|
|
|
|
nn->bl_device_pipe = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct pernet_operations nfs4blocklayout_net_ops = {
|
|
|
|
.init = nfs4blocklayout_net_init,
|
|
|
|
.exit = nfs4blocklayout_net_exit,
|
|
|
|
};
|
|
|
|
|
2011-07-31 08:52:39 +08:00
|
|
|
static int __init nfs4blocklayout_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
|
|
|
|
|
|
|
|
ret = pnfs_register_layoutdriver(&blocklayout_type);
|
2011-07-31 08:52:42 +08:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
2012-01-10 21:04:32 +08:00
|
|
|
ret = rpc_pipefs_notifier_register(&nfs4blocklayout_block);
|
2012-01-10 21:04:24 +08:00
|
|
|
if (ret)
|
|
|
|
goto out_remove;
|
2012-01-10 21:04:32 +08:00
|
|
|
ret = register_pernet_subsys(&nfs4blocklayout_net_ops);
|
|
|
|
if (ret)
|
|
|
|
goto out_notifier;
|
2011-07-31 08:52:42 +08:00
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
|
2012-01-10 21:04:32 +08:00
|
|
|
out_notifier:
|
|
|
|
rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
|
2011-07-31 08:52:42 +08:00
|
|
|
out_remove:
|
|
|
|
pnfs_unregister_layoutdriver(&blocklayout_type);
|
2011-07-31 08:52:39 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit nfs4blocklayout_exit(void)
|
|
|
|
{
|
|
|
|
dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
|
|
|
|
__func__);
|
|
|
|
|
2012-01-10 21:04:32 +08:00
|
|
|
rpc_pipefs_notifier_unregister(&nfs4blocklayout_block);
|
2012-01-10 21:04:24 +08:00
|
|
|
unregister_pernet_subsys(&nfs4blocklayout_net_ops);
|
2011-07-31 08:52:39 +08:00
|
|
|
pnfs_unregister_layoutdriver(&blocklayout_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_ALIAS("nfs-layouttype4-3");
|
|
|
|
|
|
|
|
module_init(nfs4blocklayout_init);
|
|
|
|
module_exit(nfs4blocklayout_exit);
|