1c59d87c4SChristoph Hellwig /* 2c59d87c4SChristoph Hellwig * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3c59d87c4SChristoph Hellwig * All Rights Reserved. 4c59d87c4SChristoph Hellwig * 5c59d87c4SChristoph Hellwig * This program is free software; you can redistribute it and/or 6c59d87c4SChristoph Hellwig * modify it under the terms of the GNU General Public License as 7c59d87c4SChristoph Hellwig * published by the Free Software Foundation. 8c59d87c4SChristoph Hellwig * 9c59d87c4SChristoph Hellwig * This program is distributed in the hope that it would be useful, 10c59d87c4SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 11c59d87c4SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12c59d87c4SChristoph Hellwig * GNU General Public License for more details. 13c59d87c4SChristoph Hellwig * 14c59d87c4SChristoph Hellwig * You should have received a copy of the GNU General Public License 15c59d87c4SChristoph Hellwig * along with this program; if not, write the Free Software Foundation, 16c59d87c4SChristoph Hellwig * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17c59d87c4SChristoph Hellwig */ 18c59d87c4SChristoph Hellwig #ifndef __XFS_BUF_H__ 19c59d87c4SChristoph Hellwig #define __XFS_BUF_H__ 20c59d87c4SChristoph Hellwig 21c59d87c4SChristoph Hellwig #include <linux/list.h> 22c59d87c4SChristoph Hellwig #include <linux/types.h> 23c59d87c4SChristoph Hellwig #include <linux/spinlock.h> 24c59d87c4SChristoph Hellwig #include <asm/system.h> 25c59d87c4SChristoph Hellwig #include <linux/mm.h> 26c59d87c4SChristoph Hellwig #include <linux/fs.h> 27c59d87c4SChristoph Hellwig #include <linux/buffer_head.h> 28c59d87c4SChristoph Hellwig #include <linux/uio.h> 29c59d87c4SChristoph Hellwig 30c59d87c4SChristoph Hellwig /* 31c59d87c4SChristoph Hellwig * Base types 32c59d87c4SChristoph Hellwig */ 33c59d87c4SChristoph Hellwig 34c59d87c4SChristoph Hellwig #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) 35c59d87c4SChristoph Hellwig 36c59d87c4SChristoph Hellwig #define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE) 37c59d87c4SChristoph Hellwig #define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) 38c59d87c4SChristoph Hellwig #define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT) 39c59d87c4SChristoph Hellwig #define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK) 40c59d87c4SChristoph Hellwig 41c59d87c4SChristoph Hellwig typedef enum { 42c59d87c4SChristoph Hellwig XBRW_READ = 1, /* transfer into target memory */ 43c59d87c4SChristoph Hellwig XBRW_WRITE = 2, /* transfer from target memory */ 44c59d87c4SChristoph Hellwig XBRW_ZERO = 3, /* Zero target memory */ 45c59d87c4SChristoph Hellwig } xfs_buf_rw_t; 46c59d87c4SChristoph Hellwig 47c59d87c4SChristoph Hellwig #define XBF_READ (1 << 0) /* buffer intended for reading from device */ 48c59d87c4SChristoph Hellwig #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ 49c59d87c4SChristoph Hellwig #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ 50c59d87c4SChristoph Hellwig #define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */ 51c59d87c4SChristoph Hellwig #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ 52c59d87c4SChristoph Hellwig #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ 53c59d87c4SChristoph Hellwig #define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ 54c59d87c4SChristoph Hellwig #define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ 55c59d87c4SChristoph Hellwig 56c59d87c4SChristoph Hellwig /* I/O hints for the BIO layer */ 57c59d87c4SChristoph Hellwig #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ 58c59d87c4SChristoph Hellwig #define XBF_FUA (1 << 11)/* force cache write through mode */ 59c59d87c4SChristoph Hellwig #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ 60c59d87c4SChristoph Hellwig 61c59d87c4SChristoph Hellwig /* flags used only as arguments to access routines */ 62c59d87c4SChristoph Hellwig #define XBF_LOCK (1 << 15)/* lock requested */ 63c59d87c4SChristoph Hellwig #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ 64c59d87c4SChristoph Hellwig #define XBF_DONT_BLOCK (1 << 17)/* do not block in current thread */ 65c59d87c4SChristoph Hellwig 66c59d87c4SChristoph Hellwig /* flags used only internally */ 67c59d87c4SChristoph Hellwig #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ 68c59d87c4SChristoph Hellwig #define _XBF_KMEM (1 << 21)/* backed by heap memory */ 69c59d87c4SChristoph Hellwig #define _XBF_DELWRI_Q (1 << 22)/* buffer on delwri queue */ 70c59d87c4SChristoph Hellwig 71c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 72c59d87c4SChristoph Hellwig 73c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 74c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 75c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 76c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 77c59d87c4SChristoph Hellwig { XBF_MAPPED, "MAPPED" }, \ 78c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 79c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 80c59d87c4SChristoph Hellwig { XBF_DELWRI, "DELWRI" }, \ 81c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 82c59d87c4SChristoph Hellwig { XBF_SYNCIO, "SYNCIO" }, \ 83c59d87c4SChristoph Hellwig { XBF_FUA, "FUA" }, \ 84c59d87c4SChristoph Hellwig { XBF_FLUSH, "FLUSH" }, \ 85c59d87c4SChristoph Hellwig { XBF_LOCK, "LOCK" }, /* should never be set */\ 86c59d87c4SChristoph Hellwig { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ 87c59d87c4SChristoph Hellwig { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ 88c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 89c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 90c59d87c4SChristoph Hellwig { _XBF_DELWRI_Q, "DELWRI_Q" } 91c59d87c4SChristoph Hellwig 92c59d87c4SChristoph Hellwig typedef enum { 93c59d87c4SChristoph Hellwig XBT_FORCE_SLEEP = 0, 94c59d87c4SChristoph Hellwig XBT_FORCE_FLUSH = 1, 95c59d87c4SChristoph Hellwig } xfs_buftarg_flags_t; 96c59d87c4SChristoph Hellwig 97c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 98c59d87c4SChristoph Hellwig dev_t bt_dev; 99c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 100c59d87c4SChristoph Hellwig struct backing_dev_info *bt_bdi; 101c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 102c59d87c4SChristoph Hellwig unsigned int bt_bsize; 103c59d87c4SChristoph Hellwig unsigned int bt_sshift; 104c59d87c4SChristoph Hellwig size_t bt_smask; 105c59d87c4SChristoph Hellwig 106c59d87c4SChristoph Hellwig /* per device delwri queue */ 107c59d87c4SChristoph Hellwig struct task_struct *bt_task; 108c59d87c4SChristoph Hellwig struct list_head bt_delwrite_queue; 109c59d87c4SChristoph Hellwig spinlock_t bt_delwrite_lock; 110c59d87c4SChristoph Hellwig unsigned long bt_flags; 111c59d87c4SChristoph Hellwig 112c59d87c4SChristoph Hellwig /* LRU control structures */ 113c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 114c59d87c4SChristoph Hellwig struct list_head bt_lru; 115c59d87c4SChristoph Hellwig spinlock_t bt_lru_lock; 116c59d87c4SChristoph Hellwig unsigned int bt_lru_nr; 117c59d87c4SChristoph Hellwig } xfs_buftarg_t; 118c59d87c4SChristoph Hellwig 119c59d87c4SChristoph Hellwig struct xfs_buf; 120c59d87c4SChristoph Hellwig typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); 121c59d87c4SChristoph Hellwig 122c59d87c4SChristoph Hellwig #define XB_PAGES 2 123c59d87c4SChristoph Hellwig 124c59d87c4SChristoph Hellwig typedef struct xfs_buf { 125c59d87c4SChristoph Hellwig /* 126c59d87c4SChristoph Hellwig * first cacheline holds all the fields needed for an uncontended cache 127c59d87c4SChristoph Hellwig * hit to be fully processed. The semaphore straddles the cacheline 128c59d87c4SChristoph Hellwig * boundary, but the counter and lock sits on the first cacheline, 129c59d87c4SChristoph Hellwig * which is the only bit that is touched if we hit the semaphore 130c59d87c4SChristoph Hellwig * fast-path on locking. 131c59d87c4SChristoph Hellwig */ 132c59d87c4SChristoph Hellwig struct rb_node b_rbnode; /* rbtree node */ 133c59d87c4SChristoph Hellwig xfs_off_t b_file_offset; /* offset in file */ 134c59d87c4SChristoph Hellwig size_t b_buffer_length;/* size of buffer in bytes */ 135c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 136c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 137c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 138c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 139c59d87c4SChristoph Hellwig 140c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 141c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 142c59d87c4SChristoph Hellwig struct list_head b_list; 143c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 144c59d87c4SChristoph Hellwig xfs_buftarg_t *b_target; /* buffer target (device) */ 145c59d87c4SChristoph Hellwig xfs_daddr_t b_bn; /* block number for I/O */ 146c59d87c4SChristoph Hellwig size_t b_count_desired;/* desired transfer size */ 147c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 148c59d87c4SChristoph Hellwig struct work_struct b_iodone_work; 149c59d87c4SChristoph Hellwig xfs_buf_iodone_t b_iodone; /* I/O completion function */ 150c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 151c59d87c4SChristoph Hellwig void *b_fspriv; 152c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 153c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 154c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 155c59d87c4SChristoph Hellwig unsigned long b_queuetime; /* time buffer was queued */ 156c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 157c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 158c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 159c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 160c59d87c4SChristoph Hellwig unsigned short b_error; /* error code on I/O */ 161c59d87c4SChristoph Hellwig #ifdef XFS_BUF_LOCK_TRACKING 162c59d87c4SChristoph Hellwig int b_last_holder; 163c59d87c4SChristoph Hellwig #endif 164c59d87c4SChristoph Hellwig } xfs_buf_t; 165c59d87c4SChristoph Hellwig 166c59d87c4SChristoph Hellwig 167c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 168c59d87c4SChristoph Hellwig extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, 169c59d87c4SChristoph Hellwig xfs_buf_flags_t, xfs_buf_t *); 170c59d87c4SChristoph Hellwig #define xfs_incore(buftarg,blkno,len,lockit) \ 171c59d87c4SChristoph Hellwig _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) 172c59d87c4SChristoph Hellwig 173c59d87c4SChristoph Hellwig extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, 174c59d87c4SChristoph Hellwig xfs_buf_flags_t); 175c59d87c4SChristoph Hellwig extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, 176c59d87c4SChristoph Hellwig xfs_buf_flags_t); 177c59d87c4SChristoph Hellwig 178c59d87c4SChristoph Hellwig extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *); 179c59d87c4SChristoph Hellwig extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len); 180c59d87c4SChristoph Hellwig extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); 181c59d87c4SChristoph Hellwig extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); 182c59d87c4SChristoph Hellwig extern void xfs_buf_hold(xfs_buf_t *); 183c59d87c4SChristoph Hellwig extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t); 184c59d87c4SChristoph Hellwig struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, 185c59d87c4SChristoph Hellwig struct xfs_buftarg *target, 186c59d87c4SChristoph Hellwig xfs_daddr_t daddr, size_t length, int flags); 187c59d87c4SChristoph Hellwig 188c59d87c4SChristoph Hellwig /* Releasing Buffers */ 189c59d87c4SChristoph Hellwig extern void xfs_buf_free(xfs_buf_t *); 190c59d87c4SChristoph Hellwig extern void xfs_buf_rele(xfs_buf_t *); 191c59d87c4SChristoph Hellwig 192c59d87c4SChristoph Hellwig /* Locking and Unlocking Buffers */ 193c59d87c4SChristoph Hellwig extern int xfs_buf_trylock(xfs_buf_t *); 194c59d87c4SChristoph Hellwig extern void xfs_buf_lock(xfs_buf_t *); 195c59d87c4SChristoph Hellwig extern void xfs_buf_unlock(xfs_buf_t *); 196c59d87c4SChristoph Hellwig #define xfs_buf_islocked(bp) \ 197c59d87c4SChristoph Hellwig ((bp)->b_sema.count <= 0) 198c59d87c4SChristoph Hellwig 199c59d87c4SChristoph Hellwig /* Buffer Read and Write Routines */ 200c2b006c1SChristoph Hellwig extern int xfs_bwrite(struct xfs_buf *bp); 201c59d87c4SChristoph Hellwig 202c59d87c4SChristoph Hellwig extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); 203c59d87c4SChristoph Hellwig extern int xfs_bdstrat_cb(struct xfs_buf *); 204c59d87c4SChristoph Hellwig 205c59d87c4SChristoph Hellwig extern void xfs_buf_ioend(xfs_buf_t *, int); 206c59d87c4SChristoph Hellwig extern void xfs_buf_ioerror(xfs_buf_t *, int); 207c59d87c4SChristoph Hellwig extern int xfs_buf_iorequest(xfs_buf_t *); 208c59d87c4SChristoph Hellwig extern int xfs_buf_iowait(xfs_buf_t *); 209c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 210c59d87c4SChristoph Hellwig xfs_buf_rw_t); 211c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 212c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 213c59d87c4SChristoph Hellwig 214c59d87c4SChristoph Hellwig static inline int xfs_buf_geterror(xfs_buf_t *bp) 215c59d87c4SChristoph Hellwig { 216c59d87c4SChristoph Hellwig return bp ? bp->b_error : ENOMEM; 217c59d87c4SChristoph Hellwig } 218c59d87c4SChristoph Hellwig 219c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 220c59d87c4SChristoph Hellwig extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); 221c59d87c4SChristoph Hellwig 222c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 22361551f1eSChristoph Hellwig extern void xfs_buf_delwri_queue(struct xfs_buf *); 22461551f1eSChristoph Hellwig extern void xfs_buf_delwri_dequeue(struct xfs_buf *); 22561551f1eSChristoph Hellwig extern void xfs_buf_delwri_promote(struct xfs_buf *); 226c59d87c4SChristoph Hellwig 227c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 228c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 229c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 230c59d87c4SChristoph Hellwig 231c59d87c4SChristoph Hellwig static inline const char * 232c59d87c4SChristoph Hellwig xfs_buf_target_name(struct xfs_buftarg *target) 233c59d87c4SChristoph Hellwig { 234c59d87c4SChristoph Hellwig static char __b[BDEVNAME_SIZE]; 235c59d87c4SChristoph Hellwig 236c59d87c4SChristoph Hellwig return bdevname(target->bt_bdev, __b); 237c59d87c4SChristoph Hellwig } 238c59d87c4SChristoph Hellwig 239c59d87c4SChristoph Hellwig 240c59d87c4SChristoph Hellwig #define XFS_BUF_ZEROFLAGS(bp) \ 241c59d87c4SChristoph Hellwig ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI| \ 242c59d87c4SChristoph Hellwig XBF_SYNCIO|XBF_FUA|XBF_FLUSH)) 243c59d87c4SChristoph Hellwig 244c59d87c4SChristoph Hellwig void xfs_buf_stale(struct xfs_buf *bp); 245c59d87c4SChristoph Hellwig #define XFS_BUF_STALE(bp) xfs_buf_stale(bp); 246c59d87c4SChristoph Hellwig #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) 247c59d87c4SChristoph Hellwig #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) 248c59d87c4SChristoph Hellwig #define XFS_BUF_SUPER_STALE(bp) do { \ 249c59d87c4SChristoph Hellwig XFS_BUF_STALE(bp); \ 250c59d87c4SChristoph Hellwig xfs_buf_delwri_dequeue(bp); \ 251c59d87c4SChristoph Hellwig XFS_BUF_DONE(bp); \ 252c59d87c4SChristoph Hellwig } while (0) 253c59d87c4SChristoph Hellwig 254c59d87c4SChristoph Hellwig #define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI) 255c59d87c4SChristoph Hellwig 256c59d87c4SChristoph Hellwig #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) 257c59d87c4SChristoph Hellwig #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) 258c59d87c4SChristoph Hellwig #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) 259c59d87c4SChristoph Hellwig 260c59d87c4SChristoph Hellwig #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) 261c59d87c4SChristoph Hellwig #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) 262c59d87c4SChristoph Hellwig #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) 263c59d87c4SChristoph Hellwig 264c59d87c4SChristoph Hellwig #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) 265c59d87c4SChristoph Hellwig #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) 266c59d87c4SChristoph Hellwig #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) 267c59d87c4SChristoph Hellwig 268c59d87c4SChristoph Hellwig #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) 269c59d87c4SChristoph Hellwig #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) 270c59d87c4SChristoph Hellwig #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) 271c59d87c4SChristoph Hellwig 272c59d87c4SChristoph Hellwig #define XFS_BUF_ADDR(bp) ((bp)->b_bn) 273c59d87c4SChristoph Hellwig #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) 274c59d87c4SChristoph Hellwig #define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) 275c59d87c4SChristoph Hellwig #define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) 276c59d87c4SChristoph Hellwig #define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) 277c59d87c4SChristoph Hellwig #define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) 278c59d87c4SChristoph Hellwig #define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) 279c59d87c4SChristoph Hellwig #define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) 280c59d87c4SChristoph Hellwig 281c59d87c4SChristoph Hellwig static inline void 282c59d87c4SChristoph Hellwig xfs_buf_set_ref( 283c59d87c4SChristoph Hellwig struct xfs_buf *bp, 284c59d87c4SChristoph Hellwig int lru_ref) 285c59d87c4SChristoph Hellwig { 286c59d87c4SChristoph Hellwig atomic_set(&bp->b_lru_ref, lru_ref); 287c59d87c4SChristoph Hellwig } 288c59d87c4SChristoph Hellwig #define XFS_BUF_SET_VTYPE_REF(bp, type, ref) xfs_buf_set_ref(bp, ref) 289c59d87c4SChristoph Hellwig #define XFS_BUF_SET_VTYPE(bp, type) do { } while (0) 290c59d87c4SChristoph Hellwig 291c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 292c59d87c4SChristoph Hellwig { 293c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 294c59d87c4SChristoph Hellwig } 295c59d87c4SChristoph Hellwig 296c59d87c4SChristoph Hellwig #define XFS_BUF_FINISH_IOWAIT(bp) complete(&bp->b_iowait); 297c59d87c4SChristoph Hellwig 298c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 299c59d87c4SChristoph Hellwig { 300c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 301c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 302c59d87c4SChristoph Hellwig } 303c59d87c4SChristoph Hellwig 304c59d87c4SChristoph Hellwig /* 305c59d87c4SChristoph Hellwig * Handling of buftargs. 306c59d87c4SChristoph Hellwig */ 307c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 308c59d87c4SChristoph Hellwig struct block_device *, int, const char *); 309c59d87c4SChristoph Hellwig extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); 310c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 311c59d87c4SChristoph Hellwig extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); 312c59d87c4SChristoph Hellwig extern int xfs_flush_buftarg(xfs_buftarg_t *, int); 313c59d87c4SChristoph Hellwig 314c59d87c4SChristoph Hellwig #ifdef CONFIG_KDB_MODULES 315c59d87c4SChristoph Hellwig extern struct list_head *xfs_get_buftarg_list(void); 316c59d87c4SChristoph Hellwig #endif 317c59d87c4SChristoph Hellwig 318c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 319c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 320c59d87c4SChristoph Hellwig 321c59d87c4SChristoph Hellwig #define xfs_binval(buftarg) xfs_flush_buftarg(buftarg, 1) 322c59d87c4SChristoph Hellwig #define XFS_bflush(buftarg) xfs_flush_buftarg(buftarg, 1) 323c59d87c4SChristoph Hellwig 324c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 325