diff options
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.h | 437 |
1 files changed, 0 insertions, 437 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h deleted file mode 100644 index a34c7b54822..00000000000 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ /dev/null @@ -1,437 +0,0 @@ -/* - * Copyright (c) 2000-2005 Silicon Graphics, Inc. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ -#ifndef __XFS_BUF_H__ -#define __XFS_BUF_H__ - -#include <linux/list.h> -#include <linux/types.h> -#include <linux/spinlock.h> -#include <asm/system.h> -#include <linux/mm.h> -#include <linux/fs.h> -#include <linux/buffer_head.h> -#include <linux/uio.h> - -/* - * Base types - */ - -#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) - -#define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE) -#define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -#define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT) -#define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK) - -typedef enum { - XBRW_READ = 1, /* transfer into target memory */ - XBRW_WRITE = 2, /* transfer from target memory */ - XBRW_ZERO = 3, /* Zero target memory */ -} xfs_buf_rw_t; - -typedef enum { - XBF_READ = (1 << 0), /* buffer intended for reading from device */ - XBF_WRITE = (1 << 1), /* buffer intended for writing to device */ - XBF_MAPPED = (1 << 2), /* buffer mapped (b_addr valid) */ - XBF_ASYNC = (1 << 4), /* initiator will not wait for completion */ - XBF_DONE = (1 << 5), /* all pages in the buffer uptodate */ - XBF_DELWRI = (1 << 6), /* buffer has dirty pages */ - XBF_STALE = (1 << 7), /* buffer has been staled, do not find it */ - XBF_FS_MANAGED = (1 << 8), /* filesystem controls freeing memory */ - XBF_ORDERED = (1 << 11), /* use ordered writes */ - XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead */ - XBF_LOG_BUFFER = (1 << 13), /* this is a buffer used for the log */ - - /* flags used only as arguments to access routines */ - XBF_LOCK = (1 << 14), /* lock requested */ - XBF_TRYLOCK = (1 << 15), /* lock requested, but do not wait */ - XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread */ - - /* flags used only internally */ - _XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache */ - _XBF_PAGES = (1 << 18), /* backed by refcounted pages */ - _XBF_RUN_QUEUES = (1 << 19),/* run block device task queue */ - _XBF_DELWRI_Q = (1 << 21), /* buffer on delwri queue */ - - /* - * Special flag for supporting metadata blocks smaller than a FSB. - * - * In this case we can have multiple xfs_buf_t on a single page and - * need to lock out concurrent xfs_buf_t readers as they only - * serialise access to the buffer. - * - * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation - * between reads of the page. Hence we can have one thread read the - * page and modify it, but then race with another thread that thinks - * the page is not up-to-date and hence reads it again. - * - * The result is that the first modifcation to the page is lost. - * This sort of AGF/AGI reading race can happen when unlinking inodes - * that require truncation and results in the AGI unlinked list - * modifications being lost. - */ - _XBF_PAGE_LOCKED = (1 << 22), - - /* - * If we try a barrier write, but it fails we have to communicate - * this to the upper layers. Unfortunately b_error gets overwritten - * when the buffer is re-issued so we have to add another flag to - * keep this information. - */ - _XFS_BARRIER_FAILED = (1 << 23), -} xfs_buf_flags_t; - -#define XFS_BUF_FLAGS \ - { XBF_READ, "READ" }, \ - { XBF_WRITE, "WRITE" }, \ - { XBF_MAPPED, "MAPPED" }, \ - { XBF_ASYNC, "ASYNC" }, \ - { XBF_DONE, "DONE" }, \ - { XBF_DELWRI, "DELWRI" }, \ - { XBF_STALE, "STALE" }, \ - { XBF_FS_MANAGED, "FS_MANAGED" }, \ - { XBF_ORDERED, "ORDERED" }, \ - { XBF_READ_AHEAD, "READ_AHEAD" }, \ - { XBF_LOCK, "LOCK" }, /* should never be set */\ - { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ - { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ - { _XBF_PAGE_CACHE, "PAGE_CACHE" }, \ - { _XBF_PAGES, "PAGES" }, \ - { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \ - { _XBF_DELWRI_Q, "DELWRI_Q" }, \ - { _XBF_PAGE_LOCKED, "PAGE_LOCKED" }, \ - { _XFS_BARRIER_FAILED, "BARRIER_FAILED" } - - -typedef enum { - XBT_FORCE_SLEEP = 0, - XBT_FORCE_FLUSH = 1, -} xfs_buftarg_flags_t; - -typedef struct xfs_bufhash { - struct list_head bh_list; - spinlock_t bh_lock; -} xfs_bufhash_t; - -typedef struct xfs_buftarg { - dev_t bt_dev; - struct block_device *bt_bdev; - struct address_space *bt_mapping; - unsigned int bt_bsize; - unsigned int bt_sshift; - size_t bt_smask; - - /* per device buffer hash table */ - uint bt_hashmask; - uint bt_hashshift; - xfs_bufhash_t *bt_hash; - - /* per device delwri queue */ - struct task_struct *bt_task; - struct list_head bt_list; - struct list_head bt_delwrite_queue; - spinlock_t bt_delwrite_lock; - unsigned long bt_flags; -} xfs_buftarg_t; - -/* - * xfs_buf_t: Buffer structure for pagecache-based buffers - * - * This buffer structure is used by the pagecache buffer management routines - * to refer to an assembly of pages forming a logical buffer. - * - * The buffer structure is used on a temporary basis only, and discarded when - * released. The real data storage is recorded in the pagecache. Buffers are - * hashed to the block device on which the file system resides. - */ - -struct xfs_buf; -typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); -typedef void (*xfs_buf_relse_t)(struct xfs_buf *); -typedef int (*xfs_buf_bdstrat_t)(struct xfs_buf *); - -#define XB_PAGES 2 - -typedef struct xfs_buf { - struct semaphore b_sema; /* semaphore for lockables */ - unsigned long b_queuetime; /* time buffer was queued */ - atomic_t b_pin_count; /* pin count */ - wait_queue_head_t b_waiters; /* unpin waiters */ - struct list_head b_list; - xfs_buf_flags_t b_flags; /* status flags */ - struct list_head b_hash_list; /* hash table list */ - xfs_bufhash_t *b_hash; /* hash table list start */ - xfs_buftarg_t *b_target; /* buffer target (device) */ - atomic_t b_hold; /* reference count */ - xfs_daddr_t b_bn; /* block number for I/O */ - xfs_off_t b_file_offset; /* offset in file */ - size_t b_buffer_length;/* size of buffer in bytes */ - size_t b_count_desired;/* desired transfer size */ - void *b_addr; /* virtual address of buffer */ - struct work_struct b_iodone_work; - atomic_t b_io_remaining; /* #outstanding I/O requests */ - xfs_buf_iodone_t b_iodone; /* I/O completion function */ - xfs_buf_relse_t b_relse; /* releasing function */ - xfs_buf_bdstrat_t b_strat; /* pre-write function */ - struct completion b_iowait; /* queue for I/O waiters */ - void *b_fspriv; - void *b_fspriv2; - struct xfs_mount *b_mount; - unsigned short b_error; /* error code on I/O */ - unsigned int b_page_count; /* size of page array */ - unsigned int b_offset; /* page offset in first page */ - struct page **b_pages; /* array of page pointers */ - struct page *b_page_array[XB_PAGES]; /* inline pages */ -#ifdef XFS_BUF_LOCK_TRACKING - int b_last_holder; -#endif -} xfs_buf_t; - - -/* Finding and Reading Buffers */ -extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, - xfs_buf_flags_t, xfs_buf_t *); -#define xfs_incore(buftarg,blkno,len,lockit) \ - _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) - -extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, - xfs_buf_flags_t); -extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, - xfs_buf_flags_t); - -extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *); -extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *); -extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); -extern void xfs_buf_hold(xfs_buf_t *); -extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t, - xfs_buf_flags_t); - -/* Releasing Buffers */ -extern void xfs_buf_free(xfs_buf_t *); -extern void xfs_buf_rele(xfs_buf_t *); - -/* Locking and Unlocking Buffers */ -extern int xfs_buf_cond_lock(xfs_buf_t *); -extern int xfs_buf_lock_value(xfs_buf_t *); -extern void xfs_buf_lock(xfs_buf_t *); -extern void xfs_buf_unlock(xfs_buf_t *); - -/* Buffer Read and Write Routines */ -extern int xfs_bawrite(void *mp, xfs_buf_t *bp); -extern void xfs_bdwrite(void *mp, xfs_buf_t *bp); -extern void xfs_buf_ioend(xfs_buf_t *, int); -extern void xfs_buf_ioerror(xfs_buf_t *, int); -extern int xfs_buf_iorequest(xfs_buf_t *); -extern int xfs_buf_iowait(xfs_buf_t *); -extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t, - xfs_buf_rw_t); - -static inline int xfs_buf_iostrategy(xfs_buf_t *bp) -{ - return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp); -} - -static inline int xfs_buf_geterror(xfs_buf_t *bp) -{ - return bp ? bp->b_error : ENOMEM; -} - -/* Buffer Utility Routines */ -extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); - -/* Pinning Buffer Storage in Memory */ -extern void xfs_buf_pin(xfs_buf_t *); -extern void xfs_buf_unpin(xfs_buf_t *); -extern int xfs_buf_ispin(xfs_buf_t *); - -/* Delayed Write Buffer Routines */ -extern void xfs_buf_delwri_dequeue(xfs_buf_t *); - -/* Buffer Daemon Setup Routines */ -extern int xfs_buf_init(void); -extern void xfs_buf_terminate(void); - -#define xfs_buf_target_name(target) \ - ({ char __b[BDEVNAME_SIZE]; bdevname((target)->bt_bdev, __b); __b; }) - - -#define XFS_B_ASYNC XBF_ASYNC -#define XFS_B_DELWRI XBF_DELWRI -#define XFS_B_READ XBF_READ -#define XFS_B_WRITE XBF_WRITE -#define XFS_B_STALE XBF_STALE - -#define XFS_BUF_TRYLOCK XBF_TRYLOCK -#define XFS_INCORE_TRYLOCK XBF_TRYLOCK -#define XFS_BUF_LOCK XBF_LOCK -#define XFS_BUF_MAPPED XBF_MAPPED - -#define BUF_BUSY XBF_DONT_BLOCK - -#define XFS_BUF_BFLAGS(bp) ((bp)->b_flags) -#define XFS_BUF_ZEROFLAGS(bp) ((bp)->b_flags &= \ - ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI|XBF_ORDERED)) - -#define XFS_BUF_STALE(bp) ((bp)->b_flags |= XFS_B_STALE) -#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XFS_B_STALE) -#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XFS_B_STALE) -#define XFS_BUF_SUPER_STALE(bp) do { \ - XFS_BUF_STALE(bp); \ - xfs_buf_delwri_dequeue(bp); \ - XFS_BUF_DONE(bp); \ - } while (0) - -#define XFS_BUF_MANAGE XBF_FS_MANAGED -#define XFS_BUF_UNMANAGE(bp) ((bp)->b_flags &= ~XBF_FS_MANAGED) - -#define XFS_BUF_DELAYWRITE(bp) ((bp)->b_flags |= XBF_DELWRI) -#define XFS_BUF_UNDELAYWRITE(bp) xfs_buf_delwri_dequeue(bp) -#define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI) - -#define XFS_BUF_ERROR(bp,no) xfs_buf_ioerror(bp,no) -#define XFS_BUF_GETERROR(bp) xfs_buf_geterror(bp) -#define XFS_BUF_ISERROR(bp) (xfs_buf_geterror(bp) ? 1 : 0) - -#define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) -#define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) -#define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) - -#define XFS_BUF_BUSY(bp) do { } while (0) -#define XFS_BUF_UNBUSY(bp) do { } while (0) -#define XFS_BUF_ISBUSY(bp) (1) - -#define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) -#define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) -#define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) - -#define XFS_BUF_ORDERED(bp) ((bp)->b_flags |= XBF_ORDERED) -#define XFS_BUF_UNORDERED(bp) ((bp)->b_flags &= ~XBF_ORDERED) -#define XFS_BUF_ISORDERED(bp) ((bp)->b_flags & XBF_ORDERED) - -#define XFS_BUF_HOLD(bp) xfs_buf_hold(bp) -#define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) -#define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) -#define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) - -#define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) -#define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) -#define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) - -#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone) -#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func)) -#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL) -#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func)) -#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL) - -#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv) -#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val)) -#define XFS_BUF_FSPRIVATE2(bp, type) ((type)(bp)->b_fspriv2) -#define XFS_BUF_SET_FSPRIVATE2(bp, val) ((bp)->b_fspriv2 = (void*)(val)) -#define XFS_BUF_SET_START(bp) do { } while (0) -#define XFS_BUF_SET_BRELSE_FUNC(bp, func) ((bp)->b_relse = (func)) - -#define XFS_BUF_PTR(bp) (xfs_caddr_t)((bp)->b_addr) -#define XFS_BUF_SET_PTR(bp, val, cnt) xfs_buf_associate_memory(bp, val, cnt) -#define XFS_BUF_ADDR(bp) ((bp)->b_bn) -#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) -#define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) -#define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) -#define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) -#define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) -#define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) -#define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) - -#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) do { } while (0) -#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0) -#define XFS_BUF_SET_REF(bp, ref) do { } while (0) - -#define XFS_BUF_ISPINNED(bp) xfs_buf_ispin(bp) - -#define XFS_BUF_VALUSEMA(bp) xfs_buf_lock_value(bp) -#define XFS_BUF_CPSEMA(bp) (xfs_buf_cond_lock(bp) == 0) -#define XFS_BUF_VSEMA(bp) xfs_buf_unlock(bp) -#define XFS_BUF_PSEMA(bp,x) xfs_buf_lock(bp) -#define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait); - -#define XFS_BUF_SET_TARGET(bp, target) ((bp)->b_target = (target)) -#define XFS_BUF_TARGET(bp) ((bp)->b_target) -#define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target) - -static inline void xfs_buf_relse(xfs_buf_t *bp) -{ - if (!bp->b_relse) - xfs_buf_unlock(bp); - xfs_buf_rele(bp); -} - -#define xfs_bpin(bp) xfs_buf_pin(bp) -#define xfs_bunpin(bp) xfs_buf_unpin(bp) -#define xfs_biodone(bp) xfs_buf_ioend(bp, 0) - -#define xfs_biomove(bp, off, len, data, rw) \ - xfs_buf_iomove((bp), (off), (len), (data), \ - ((rw) == XFS_B_WRITE) ? XBRW_WRITE : XBRW_READ) - -#define xfs_biozero(bp, off, len) \ - xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) - - -static inline int XFS_bwrite(xfs_buf_t *bp) -{ - int iowait = (bp->b_flags & XBF_ASYNC) == 0; - int error = 0; - - if (!iowait) - bp->b_flags |= _XBF_RUN_QUEUES; - - xfs_buf_delwri_dequeue(bp); - xfs_buf_iostrategy(bp); - if (iowait) { - error = xfs_buf_iowait(bp); - xfs_buf_relse(bp); - } - return error; -} - -#define XFS_bdstrat(bp) xfs_buf_iorequest(bp) - -#define xfs_iowait(bp) xfs_buf_iowait(bp) - -#define xfs_baread(target, rablkno, ralen) \ - xfs_buf_readahead((target), (rablkno), (ralen), XBF_DONT_BLOCK) - - -/* - * Handling of buftargs. - */ -extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *, int); -extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); -extern void xfs_wait_buftarg(xfs_buftarg_t *); -extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); -extern int xfs_flush_buftarg(xfs_buftarg_t *, int); -#ifdef CONFIG_KDB_MODULES -extern struct list_head *xfs_get_buftarg_list(void); -#endif - -#define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) -#define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) - -#define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1) -#define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1) - -#endif /* __XFS_BUF_H__ */ |