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 <linux/mm.h> 25c59d87c4SChristoph Hellwig #include <linux/fs.h> 26c59d87c4SChristoph Hellwig #include <linux/buffer_head.h> 27c59d87c4SChristoph Hellwig #include <linux/uio.h> 28e80dfa19SDave Chinner #include <linux/list_lru.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 typedef enum { 37c59d87c4SChristoph Hellwig XBRW_READ = 1, /* transfer into target memory */ 38c59d87c4SChristoph Hellwig XBRW_WRITE = 2, /* transfer from target memory */ 39c59d87c4SChristoph Hellwig XBRW_ZERO = 3, /* Zero target memory */ 40c59d87c4SChristoph Hellwig } xfs_buf_rw_t; 41c59d87c4SChristoph Hellwig 42c59d87c4SChristoph Hellwig #define XBF_READ (1 << 0) /* buffer intended for reading from device */ 43c59d87c4SChristoph Hellwig #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ 44c59d87c4SChristoph Hellwig #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ 45c59d87c4SChristoph Hellwig #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ 46c59d87c4SChristoph Hellwig #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ 4743ff2122SChristoph Hellwig #define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ 48ac8809f9SDave Chinner #define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */ 49c59d87c4SChristoph Hellwig 50c59d87c4SChristoph Hellwig /* I/O hints for the BIO layer */ 51c59d87c4SChristoph Hellwig #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ 52c59d87c4SChristoph Hellwig #define XBF_FUA (1 << 11)/* force cache write through mode */ 53c59d87c4SChristoph Hellwig #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ 54c59d87c4SChristoph Hellwig 55c59d87c4SChristoph Hellwig /* flags used only as arguments to access routines */ 56c59d87c4SChristoph Hellwig #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ 57611c9946SDave Chinner #define XBF_UNMAPPED (1 << 17)/* do not map the buffer */ 58c59d87c4SChristoph Hellwig 59c59d87c4SChristoph Hellwig /* flags used only internally */ 60c59d87c4SChristoph Hellwig #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ 61c59d87c4SChristoph Hellwig #define _XBF_KMEM (1 << 21)/* backed by heap memory */ 6243ff2122SChristoph Hellwig #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ 63cbb7baabSDave Chinner #define _XBF_COMPOUND (1 << 23)/* compound buffer */ 64c59d87c4SChristoph Hellwig 65c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 66c59d87c4SChristoph Hellwig 67c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 68c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 69c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 70c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 71c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 72c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 73c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 74ac8809f9SDave Chinner { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ 75c59d87c4SChristoph Hellwig { XBF_SYNCIO, "SYNCIO" }, \ 76c59d87c4SChristoph Hellwig { XBF_FUA, "FUA" }, \ 77c59d87c4SChristoph Hellwig { XBF_FLUSH, "FLUSH" }, \ 78a8acad70SDave Chinner { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\ 79611c9946SDave Chinner { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ 80c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 81c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 82cbb7baabSDave Chinner { _XBF_DELWRI_Q, "DELWRI_Q" }, \ 83a4082357SDave Chinner { _XBF_COMPOUND, "COMPOUND" } 84a4082357SDave Chinner 85ac8809f9SDave Chinner 86a4082357SDave Chinner /* 87a4082357SDave Chinner * Internal state flags. 88a4082357SDave Chinner */ 89a4082357SDave Chinner #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ 90c59d87c4SChristoph Hellwig 91c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 92c59d87c4SChristoph Hellwig dev_t bt_dev; 93c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 94c59d87c4SChristoph Hellwig struct backing_dev_info *bt_bdi; 95c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 966da54179SEric Sandeen unsigned int bt_meta_sectorsize; 976da54179SEric Sandeen size_t bt_meta_sectormask; 98c59d87c4SChristoph Hellwig 99c59d87c4SChristoph Hellwig /* LRU control structures */ 100c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 101e80dfa19SDave Chinner struct list_lru bt_lru; 102c59d87c4SChristoph Hellwig } xfs_buftarg_t; 103c59d87c4SChristoph Hellwig 104c59d87c4SChristoph Hellwig struct xfs_buf; 105c59d87c4SChristoph Hellwig typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); 106c59d87c4SChristoph Hellwig 107c3f8fc73SDave Chinner 108c59d87c4SChristoph Hellwig #define XB_PAGES 2 109c59d87c4SChristoph Hellwig 110cbb7baabSDave Chinner struct xfs_buf_map { 111cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 112cbb7baabSDave Chinner int bm_len; /* size of I/O */ 113cbb7baabSDave Chinner }; 114cbb7baabSDave Chinner 1153e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1163e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1173e85c868SDave Chinner 1181813dd64SDave Chinner struct xfs_buf_ops { 1191813dd64SDave Chinner void (*verify_read)(struct xfs_buf *); 1201813dd64SDave Chinner void (*verify_write)(struct xfs_buf *); 1211813dd64SDave Chinner }; 1221813dd64SDave Chinner 123c59d87c4SChristoph Hellwig typedef struct xfs_buf { 124c59d87c4SChristoph Hellwig /* 125c59d87c4SChristoph Hellwig * first cacheline holds all the fields needed for an uncontended cache 126c59d87c4SChristoph Hellwig * hit to be fully processed. The semaphore straddles the cacheline 127c59d87c4SChristoph Hellwig * boundary, but the counter and lock sits on the first cacheline, 128c59d87c4SChristoph Hellwig * which is the only bit that is touched if we hit the semaphore 129c59d87c4SChristoph Hellwig * fast-path on locking. 130c59d87c4SChristoph Hellwig */ 131c59d87c4SChristoph Hellwig struct rb_node b_rbnode; /* rbtree node */ 132cbb7baabSDave Chinner xfs_daddr_t b_bn; /* block number of buffer */ 1334e94b71bSDave Chinner int b_length; /* size of buffer in BBs */ 134c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 135c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 136c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 137c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 138c59d87c4SChristoph Hellwig 1396fb8a90aSCarlos Maiolino /* 1406fb8a90aSCarlos Maiolino * concurrent access to b_lru and b_lru_flags are protected by 1416fb8a90aSCarlos Maiolino * bt_lru_lock and not by b_sema 1426fb8a90aSCarlos Maiolino */ 143c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 144a4082357SDave Chinner spinlock_t b_lock; /* internal state lock */ 145a4082357SDave Chinner unsigned int b_state; /* internal state flags */ 146c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 147c59d87c4SChristoph Hellwig struct list_head b_list; 148c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 149c59d87c4SChristoph Hellwig xfs_buftarg_t *b_target; /* buffer target (device) */ 150c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 151c59d87c4SChristoph Hellwig struct work_struct b_iodone_work; 152c59d87c4SChristoph Hellwig xfs_buf_iodone_t b_iodone; /* I/O completion function */ 153c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 154c59d87c4SChristoph Hellwig void *b_fspriv; 155c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 156c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 157c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 1583e85c868SDave Chinner struct xfs_buf_map *b_maps; /* compound buffer map */ 159d44d9bc6SMark Tinguely struct xfs_buf_map __b_map; /* inline compound buffer map */ 1603e85c868SDave Chinner int b_map_count; 161aa0e8833SDave Chinner int b_io_length; /* IO size in BBs */ 162c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 163c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 164c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 165c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 166c59d87c4SChristoph Hellwig unsigned short b_error; /* error code on I/O */ 1671813dd64SDave Chinner const struct xfs_buf_ops *b_ops; 168cfb02852SDave Chinner 169c59d87c4SChristoph Hellwig #ifdef XFS_BUF_LOCK_TRACKING 170c59d87c4SChristoph Hellwig int b_last_holder; 171c59d87c4SChristoph Hellwig #endif 172c59d87c4SChristoph Hellwig } xfs_buf_t; 173c59d87c4SChristoph Hellwig 174c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 1753e85c868SDave Chinner struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, 1763e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 1773e85c868SDave Chinner xfs_buf_flags_t flags, struct xfs_buf *new_bp); 1783e85c868SDave Chinner 1793e85c868SDave Chinner static inline struct xfs_buf * 1803e85c868SDave Chinner xfs_incore( 1813e85c868SDave Chinner struct xfs_buftarg *target, 1823e85c868SDave Chinner xfs_daddr_t blkno, 1833e85c868SDave Chinner size_t numblks, 1843e85c868SDave Chinner xfs_buf_flags_t flags) 1853e85c868SDave Chinner { 1863e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 1873e85c868SDave Chinner return _xfs_buf_find(target, &map, 1, flags, NULL); 1883e85c868SDave Chinner } 1893e85c868SDave Chinner 1903e85c868SDave Chinner struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, 1913e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 1923e85c868SDave Chinner xfs_buf_flags_t flags); 1933e85c868SDave Chinner 1943e85c868SDave Chinner static inline struct xfs_buf * 1953e85c868SDave Chinner xfs_buf_alloc( 1963e85c868SDave Chinner struct xfs_buftarg *target, 1973e85c868SDave Chinner xfs_daddr_t blkno, 1983e85c868SDave Chinner size_t numblks, 1993e85c868SDave Chinner xfs_buf_flags_t flags) 2003e85c868SDave Chinner { 2013e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2023e85c868SDave Chinner return _xfs_buf_alloc(target, &map, 1, flags); 2033e85c868SDave Chinner } 204c59d87c4SChristoph Hellwig 2056dde2707SDave Chinner struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, 2066dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2076dde2707SDave Chinner xfs_buf_flags_t flags); 2086dde2707SDave Chinner struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, 2096dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2101813dd64SDave Chinner xfs_buf_flags_t flags, 2111813dd64SDave Chinner const struct xfs_buf_ops *ops); 2126dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 213c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2141813dd64SDave Chinner const struct xfs_buf_ops *ops); 2156dde2707SDave Chinner 2166dde2707SDave Chinner static inline struct xfs_buf * 2176dde2707SDave Chinner xfs_buf_get( 2186dde2707SDave Chinner struct xfs_buftarg *target, 2196dde2707SDave Chinner xfs_daddr_t blkno, 2206dde2707SDave Chinner size_t numblks, 2216dde2707SDave Chinner xfs_buf_flags_t flags) 2226dde2707SDave Chinner { 2236dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2246dde2707SDave Chinner return xfs_buf_get_map(target, &map, 1, flags); 2256dde2707SDave Chinner } 2266dde2707SDave Chinner 2276dde2707SDave Chinner static inline struct xfs_buf * 2286dde2707SDave Chinner xfs_buf_read( 2296dde2707SDave Chinner struct xfs_buftarg *target, 2306dde2707SDave Chinner xfs_daddr_t blkno, 2316dde2707SDave Chinner size_t numblks, 232c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2331813dd64SDave Chinner const struct xfs_buf_ops *ops) 2346dde2707SDave Chinner { 2356dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2361813dd64SDave Chinner return xfs_buf_read_map(target, &map, 1, flags, ops); 2376dde2707SDave Chinner } 2386dde2707SDave Chinner 2396dde2707SDave Chinner static inline void 2406dde2707SDave Chinner xfs_buf_readahead( 2416dde2707SDave Chinner struct xfs_buftarg *target, 2426dde2707SDave Chinner xfs_daddr_t blkno, 243c3f8fc73SDave Chinner size_t numblks, 2441813dd64SDave Chinner const struct xfs_buf_ops *ops) 2456dde2707SDave Chinner { 2466dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2471813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2486dde2707SDave Chinner } 249c59d87c4SChristoph Hellwig 250e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks); 251e70b73f8SDave Chinner void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks); 252e70b73f8SDave Chinner int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length); 253e70b73f8SDave Chinner 254e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, 255e70b73f8SDave Chinner int flags); 256e70b73f8SDave Chinner struct xfs_buf *xfs_buf_read_uncached(struct xfs_buftarg *target, 257c3f8fc73SDave Chinner xfs_daddr_t daddr, size_t numblks, int flags, 2581813dd64SDave Chinner const struct xfs_buf_ops *ops); 259e70b73f8SDave Chinner void xfs_buf_hold(struct xfs_buf *bp); 260c59d87c4SChristoph Hellwig 261c59d87c4SChristoph Hellwig /* Releasing Buffers */ 262c59d87c4SChristoph Hellwig extern void xfs_buf_free(xfs_buf_t *); 263c59d87c4SChristoph Hellwig extern void xfs_buf_rele(xfs_buf_t *); 264c59d87c4SChristoph Hellwig 265c59d87c4SChristoph Hellwig /* Locking and Unlocking Buffers */ 266c59d87c4SChristoph Hellwig extern int xfs_buf_trylock(xfs_buf_t *); 267c59d87c4SChristoph Hellwig extern void xfs_buf_lock(xfs_buf_t *); 268c59d87c4SChristoph Hellwig extern void xfs_buf_unlock(xfs_buf_t *); 269c59d87c4SChristoph Hellwig #define xfs_buf_islocked(bp) \ 270c59d87c4SChristoph Hellwig ((bp)->b_sema.count <= 0) 271c59d87c4SChristoph Hellwig 272c59d87c4SChristoph Hellwig /* Buffer Read and Write Routines */ 273c2b006c1SChristoph Hellwig extern int xfs_bwrite(struct xfs_buf *bp); 274c59d87c4SChristoph Hellwig extern void xfs_buf_ioend(xfs_buf_t *, int); 275c59d87c4SChristoph Hellwig extern void xfs_buf_ioerror(xfs_buf_t *, int); 276901796afSChristoph Hellwig extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); 2770e95f19aSDave Chinner extern void xfs_buf_iorequest(xfs_buf_t *); 278c59d87c4SChristoph Hellwig extern int xfs_buf_iowait(xfs_buf_t *); 279c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 280c59d87c4SChristoph Hellwig xfs_buf_rw_t); 281c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 282c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 283c59d87c4SChristoph Hellwig 28483a0adc3SChristoph Hellwig extern int xfs_bioerror_relse(struct xfs_buf *); 28583a0adc3SChristoph Hellwig 286c59d87c4SChristoph Hellwig static inline int xfs_buf_geterror(xfs_buf_t *bp) 287c59d87c4SChristoph Hellwig { 288c59d87c4SChristoph Hellwig return bp ? bp->b_error : ENOMEM; 289c59d87c4SChristoph Hellwig } 290c59d87c4SChristoph Hellwig 291c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 292c59d87c4SChristoph Hellwig extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); 293c59d87c4SChristoph Hellwig 294c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 29543ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 29643ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 29743ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 298c59d87c4SChristoph Hellwig 299c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 300c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 301c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 302c59d87c4SChristoph Hellwig 303c59d87c4SChristoph Hellwig #define XFS_BUF_ZEROFLAGS(bp) \ 30443ff2122SChristoph Hellwig ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \ 305ac8809f9SDave Chinner XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \ 306ac8809f9SDave Chinner XBF_WRITE_FAIL)) 307c59d87c4SChristoph Hellwig 308c59d87c4SChristoph Hellwig void xfs_buf_stale(struct xfs_buf *bp); 309c59d87c4SChristoph Hellwig #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) 310c59d87c4SChristoph Hellwig #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) 311c59d87c4SChristoph Hellwig 312c59d87c4SChristoph Hellwig #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) 313c59d87c4SChristoph Hellwig #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) 314c59d87c4SChristoph Hellwig #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) 315c59d87c4SChristoph Hellwig 316c59d87c4SChristoph Hellwig #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) 317c59d87c4SChristoph Hellwig #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) 318c59d87c4SChristoph Hellwig #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) 319c59d87c4SChristoph Hellwig 320c59d87c4SChristoph Hellwig #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) 321c59d87c4SChristoph Hellwig #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) 322c59d87c4SChristoph Hellwig #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) 323c59d87c4SChristoph Hellwig 324c59d87c4SChristoph Hellwig #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) 325c59d87c4SChristoph Hellwig #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) 326c59d87c4SChristoph Hellwig #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) 327c59d87c4SChristoph Hellwig 328cbb7baabSDave Chinner /* 329cbb7baabSDave Chinner * These macros use the IO block map rather than b_bn. b_bn is now really 330cbb7baabSDave Chinner * just for the buffer cache index for cached buffers. As IO does not use b_bn 331cbb7baabSDave Chinner * anymore, uncached buffers do not use b_bn at all and hence must modify the IO 332cbb7baabSDave Chinner * map directly. Uncached buffers are not allowed to be discontiguous, so this 333cbb7baabSDave Chinner * is safe to do. 334cbb7baabSDave Chinner * 335cbb7baabSDave Chinner * In future, uncached buffers will pass the block number directly to the io 336cbb7baabSDave Chinner * request function and hence these macros will go away at that point. 337cbb7baabSDave Chinner */ 338d44d9bc6SMark Tinguely #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) 339d44d9bc6SMark Tinguely #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) 340c59d87c4SChristoph Hellwig 34138f23232SChristoph Hellwig static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) 342c59d87c4SChristoph Hellwig { 343c59d87c4SChristoph Hellwig atomic_set(&bp->b_lru_ref, lru_ref); 344c59d87c4SChristoph Hellwig } 345c59d87c4SChristoph Hellwig 346c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 347c59d87c4SChristoph Hellwig { 348c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 349c59d87c4SChristoph Hellwig } 350c59d87c4SChristoph Hellwig 351c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 352c59d87c4SChristoph Hellwig { 353c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 354c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 355c59d87c4SChristoph Hellwig } 356c59d87c4SChristoph Hellwig 357c59d87c4SChristoph Hellwig /* 358c59d87c4SChristoph Hellwig * Handling of buftargs. 359c59d87c4SChristoph Hellwig */ 360c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 361c59d87c4SChristoph Hellwig struct block_device *, int, const char *); 362c59d87c4SChristoph Hellwig extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); 363c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 364c59d87c4SChristoph Hellwig extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); 365c59d87c4SChristoph Hellwig 366c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 367c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 368c59d87c4SChristoph Hellwig 369c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 370