306 lines
9.1 KiB
C
306 lines
9.1 KiB
C
/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com)
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs 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. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs 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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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __EXOFS_H__
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#define __EXOFS_H__
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/backing-dev.h>
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#include <linux/pnfs_osd_xdr.h>
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#include "common.h"
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#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
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#ifdef CONFIG_EXOFS_DEBUG
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#define EXOFS_DBGMSG(fmt, a...) \
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printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
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#else
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#define EXOFS_DBGMSG(fmt, a...) \
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do { if (0) printk(fmt, ##a); } while (0)
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#endif
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/* u64 has problems with printk this will cast it to unsigned long long */
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#define _LLU(x) (unsigned long long)(x)
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struct exofs_layout {
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osd_id s_pid; /* partition ID of file system*/
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/* Our way of looking at the data_map */
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unsigned stripe_unit;
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unsigned mirrors_p1;
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unsigned group_width;
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u64 group_depth;
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unsigned group_count;
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enum exofs_inode_layout_gen_functions lay_func;
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unsigned s_numdevs; /* Num of devices in array */
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struct osd_dev **s_ods; /* osd_dev array */
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};
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/*
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* our extension to the in-memory superblock
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*/
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struct exofs_sb_info {
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struct backing_dev_info bdi; /* register our bdi with VFS */
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struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
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int s_timeout; /* timeout for OSD operations */
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uint64_t s_nextid; /* highest object ID used */
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uint32_t s_numfiles; /* number of files on fs */
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spinlock_t s_next_gen_lock; /* spinlock for gen # update */
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u32 s_next_generation; /* next gen # to use */
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atomic_t s_curr_pending; /* number of pending commands */
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uint8_t s_cred[OSD_CAP_LEN]; /* credential for the fscb */
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struct pnfs_osd_data_map data_map; /* Default raid to use
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* FIXME: Needed ?
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*/
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struct exofs_layout layout; /* Default files layout */
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struct osd_dev *_min_one_dev[1]; /* Place holder for one dev */
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};
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/*
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* our extension to the in-memory inode
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*/
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struct exofs_i_info {
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struct inode vfs_inode; /* normal in-memory inode */
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wait_queue_head_t i_wq; /* wait queue for inode */
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unsigned long i_flags; /* various atomic flags */
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uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
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uint32_t i_dir_start_lookup; /* which page to start lookup */
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uint64_t i_commit_size; /* the object's written length */
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uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
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};
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static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
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{
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return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
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}
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struct exofs_io_state;
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typedef void (*exofs_io_done_fn)(struct exofs_io_state *ios, void *private);
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struct exofs_io_state {
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struct kref kref;
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void *private;
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exofs_io_done_fn done;
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struct exofs_layout *layout;
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struct osd_obj_id obj;
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u8 *cred;
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/* Global read/write IO*/
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loff_t offset;
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unsigned long length;
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void *kern_buff;
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struct page **pages;
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unsigned nr_pages;
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unsigned pgbase;
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unsigned pages_consumed;
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/* Attributes */
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unsigned in_attr_len;
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struct osd_attr *in_attr;
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unsigned out_attr_len;
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struct osd_attr *out_attr;
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bool reading;
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/* Variable array of size numdevs */
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unsigned numdevs;
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struct exofs_per_dev_state {
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struct osd_request *or;
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struct bio *bio;
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loff_t offset;
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unsigned length;
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unsigned dev;
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} per_dev[];
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};
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static inline unsigned exofs_io_state_size(unsigned numdevs)
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{
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return sizeof(struct exofs_io_state) +
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sizeof(struct exofs_per_dev_state) * numdevs;
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}
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/*
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* our inode flags
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*/
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#define OBJ_2BCREATED 0 /* object will be created soon*/
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#define OBJ_CREATED 1 /* object has been created on the osd*/
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static inline int obj_2bcreated(struct exofs_i_info *oi)
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{
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return test_bit(OBJ_2BCREATED, &oi->i_flags);
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}
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static inline void set_obj_2bcreated(struct exofs_i_info *oi)
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{
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set_bit(OBJ_2BCREATED, &oi->i_flags);
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}
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static inline int obj_created(struct exofs_i_info *oi)
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{
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return test_bit(OBJ_CREATED, &oi->i_flags);
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}
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static inline void set_obj_created(struct exofs_i_info *oi)
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{
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set_bit(OBJ_CREATED, &oi->i_flags);
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}
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int __exofs_wait_obj_created(struct exofs_i_info *oi);
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static inline int wait_obj_created(struct exofs_i_info *oi)
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{
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if (likely(obj_created(oi)))
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return 0;
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return __exofs_wait_obj_created(oi);
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}
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/*
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* get to our inode from the vfs inode
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*/
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static inline struct exofs_i_info *exofs_i(struct inode *inode)
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{
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return container_of(inode, struct exofs_i_info, vfs_inode);
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}
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/*
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* Given a layout, object_number and stripe_index return the associated global
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* dev_index
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*/
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unsigned exofs_layout_od_id(struct exofs_layout *layout,
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osd_id obj_no, unsigned layout_index);
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/*
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* Maximum count of links to a file
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*/
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#define EXOFS_LINK_MAX 32000
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/*************************
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* function declarations *
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*************************/
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/* ios.c */
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void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
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const struct osd_obj_id *obj);
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int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
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u64 offset, void *p, unsigned length);
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int exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,
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u64 offset, u64 length, struct exofs_io_state **ios);
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int exofs_get_io_state(struct exofs_layout *layout,
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struct exofs_io_state **ios);
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void exofs_put_io_state(struct exofs_io_state *ios);
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int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
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int exofs_sbi_create(struct exofs_io_state *ios);
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int exofs_sbi_remove(struct exofs_io_state *ios);
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int exofs_sbi_write(struct exofs_io_state *ios);
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int exofs_sbi_read(struct exofs_io_state *ios);
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int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
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int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
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static inline int exofs_oi_write(struct exofs_i_info *oi,
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struct exofs_io_state *ios)
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{
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ios->obj.id = exofs_oi_objno(oi);
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ios->cred = oi->i_cred;
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return exofs_sbi_write(ios);
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}
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static inline int exofs_oi_read(struct exofs_i_info *oi,
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struct exofs_io_state *ios)
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{
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ios->obj.id = exofs_oi_objno(oi);
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ios->cred = oi->i_cred;
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return exofs_sbi_read(ios);
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}
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/* inode.c */
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unsigned exofs_max_io_pages(struct exofs_layout *layout,
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unsigned expected_pages);
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int exofs_setattr(struct dentry *, struct iattr *);
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int exofs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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extern struct inode *exofs_iget(struct super_block *, unsigned long);
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struct inode *exofs_new_inode(struct inode *, int);
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extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
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extern void exofs_evict_inode(struct inode *);
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/* dir.c: */
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int exofs_add_link(struct dentry *, struct inode *);
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ino_t exofs_inode_by_name(struct inode *, struct dentry *);
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int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
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int exofs_make_empty(struct inode *, struct inode *);
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struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
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struct page **);
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int exofs_empty_dir(struct inode *);
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struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
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ino_t exofs_parent_ino(struct dentry *child);
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int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
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struct inode *);
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/* super.c */
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int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
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/*********************
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* operation vectors *
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*********************/
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/* dir.c: */
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extern const struct file_operations exofs_dir_operations;
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/* file.c */
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extern const struct inode_operations exofs_file_inode_operations;
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extern const struct file_operations exofs_file_operations;
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/* inode.c */
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extern const struct address_space_operations exofs_aops;
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extern const struct osd_attr g_attr_logical_length;
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/* namei.c */
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extern const struct inode_operations exofs_dir_inode_operations;
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extern const struct inode_operations exofs_special_inode_operations;
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/* symlink.c */
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extern const struct inode_operations exofs_symlink_inode_operations;
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extern const struct inode_operations exofs_fast_symlink_inode_operations;
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#endif
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