diff options
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.h | 336 |
1 files changed, 0 insertions, 336 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 6a83b46b4bcf..000000000000 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ /dev/null @@ -1,336 +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; - -#define XBF_READ (1 << 0) /* buffer intended for reading from device */ -#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ -#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ -#define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */ -#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ -#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ -#define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ -#define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ - -/* I/O hints for the BIO layer */ -#define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ -#define XBF_FUA (1 << 11)/* force cache write through mode */ -#define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ - -/* flags used only as arguments to access routines */ -#define XBF_LOCK (1 << 15)/* lock requested */ -#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ -#define XBF_DONT_BLOCK (1 << 17)/* do not block in current thread */ - -/* flags used only internally */ -#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ -#define _XBF_KMEM (1 << 21)/* backed by heap memory */ -#define _XBF_DELWRI_Q (1 << 22)/* buffer on delwri queue */ - -typedef unsigned int xfs_buf_flags_t; - -#define XFS_BUF_FLAGS \ - { XBF_READ, "READ" }, \ - { XBF_WRITE, "WRITE" }, \ - { XBF_READ_AHEAD, "READ_AHEAD" }, \ - { XBF_MAPPED, "MAPPED" }, \ - { XBF_ASYNC, "ASYNC" }, \ - { XBF_DONE, "DONE" }, \ - { XBF_DELWRI, "DELWRI" }, \ - { XBF_STALE, "STALE" }, \ - { XBF_SYNCIO, "SYNCIO" }, \ - { XBF_FUA, "FUA" }, \ - { XBF_FLUSH, "FLUSH" }, \ - { XBF_LOCK, "LOCK" }, /* should never be set */\ - { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ - { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ - { _XBF_PAGES, "PAGES" }, \ - { _XBF_KMEM, "KMEM" }, \ - { _XBF_DELWRI_Q, "DELWRI_Q" } - -typedef enum { - XBT_FORCE_SLEEP = 0, - XBT_FORCE_FLUSH = 1, -} xfs_buftarg_flags_t; - -typedef struct xfs_buftarg { - dev_t bt_dev; - struct block_device *bt_bdev; - struct backing_dev_info *bt_bdi; - struct xfs_mount *bt_mount; - unsigned int bt_bsize; - unsigned int bt_sshift; - size_t bt_smask; - - /* per device delwri queue */ - struct task_struct *bt_task; - struct list_head bt_delwrite_queue; - spinlock_t bt_delwrite_lock; - unsigned long bt_flags; - - /* LRU control structures */ - struct shrinker bt_shrinker; - struct list_head bt_lru; - spinlock_t bt_lru_lock; - unsigned int bt_lru_nr; -} xfs_buftarg_t; - -struct xfs_buf; -typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); - -#define XB_PAGES 2 - -typedef struct xfs_buf { - /* - * first cacheline holds all the fields needed for an uncontended cache - * hit to be fully processed. The semaphore straddles the cacheline - * boundary, but the counter and lock sits on the first cacheline, - * which is the only bit that is touched if we hit the semaphore - * fast-path on locking. - */ - struct rb_node b_rbnode; /* rbtree node */ - xfs_off_t b_file_offset; /* offset in file */ - size_t b_buffer_length;/* size of buffer in bytes */ - atomic_t b_hold; /* reference count */ - atomic_t b_lru_ref; /* lru reclaim ref count */ - xfs_buf_flags_t b_flags; /* status flags */ - struct semaphore b_sema; /* semaphore for lockables */ - - struct list_head b_lru; /* lru list */ - wait_queue_head_t b_waiters; /* unpin waiters */ - struct list_head b_list; - struct xfs_perag *b_pag; /* contains rbtree root */ - xfs_buftarg_t *b_target; /* buffer target (device) */ - xfs_daddr_t b_bn; /* block number for I/O */ - size_t b_count_desired;/* desired transfer size */ - void *b_addr; /* virtual address of buffer */ - struct work_struct b_iodone_work; - xfs_buf_iodone_t b_iodone; /* I/O completion function */ - struct completion b_iowait; /* queue for I/O waiters */ - void *b_fspriv; - struct xfs_trans *b_transp; - struct page **b_pages; /* array of page pointers */ - struct page *b_page_array[XB_PAGES]; /* inline pages */ - unsigned long b_queuetime; /* time buffer was queued */ - atomic_t b_pin_count; /* pin count */ - atomic_t b_io_remaining; /* #outstanding I/O requests */ - unsigned int b_page_count; /* size of page array */ - unsigned int b_offset; /* page offset in first page */ - unsigned short b_error; /* error code on I/O */ -#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 void xfs_buf_set_empty(struct xfs_buf *bp, size_t len); -extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); -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); -struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, - struct xfs_buftarg *target, - xfs_daddr_t daddr, size_t length, int flags); - -/* 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_trylock(xfs_buf_t *); -extern void xfs_buf_lock(xfs_buf_t *); -extern void xfs_buf_unlock(xfs_buf_t *); -#define xfs_buf_islocked(bp) \ - ((bp)->b_sema.count <= 0) - -/* Buffer Read and Write Routines */ -extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp); -extern void xfs_bdwrite(void *mp, xfs_buf_t *bp); - -extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); -extern int xfs_bdstrat_cb(struct xfs_buf *); - -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, void *, - xfs_buf_rw_t); -#define xfs_buf_zero(bp, off, len) \ - xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) - -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); - -/* Delayed Write Buffer Routines */ -extern void xfs_buf_delwri_dequeue(xfs_buf_t *); -extern void xfs_buf_delwri_promote(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_BUF_BFLAGS(bp) ((bp)->b_flags) -#define XFS_BUF_ZEROFLAGS(bp) \ - ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI| \ - XBF_SYNCIO|XBF_FUA|XBF_FLUSH)) - -void xfs_buf_stale(struct xfs_buf *bp); -#define XFS_BUF_STALE(bp) xfs_buf_stale(bp); -#define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) -#define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_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_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_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_SET_START(bp) do { } while (0) - -#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)) - -static inline void -xfs_buf_set_ref( - struct xfs_buf *bp, - int lru_ref) -{ - atomic_set(&bp->b_lru_ref, lru_ref); -} -#define XFS_BUF_SET_VTYPE_REF(bp, type, ref) xfs_buf_set_ref(bp, ref) -#define XFS_BUF_SET_VTYPE(bp, type) do { } while (0) - -#define XFS_BUF_ISPINNED(bp) atomic_read(&((bp)->b_pin_count)) - -#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) -{ - xfs_buf_unlock(bp); - xfs_buf_rele(bp); -} - -/* - * Handling of buftargs. - */ -extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, - struct block_device *, int, const char *); -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__ */ |