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 917c71ee78SEric Sandeen /* 927c71ee78SEric Sandeen * The xfs_buftarg contains 2 notions of "sector size" - 937c71ee78SEric Sandeen * 947c71ee78SEric Sandeen * 1) The metadata sector size, which is the minimum unit and 957c71ee78SEric Sandeen * alignment of IO which will be performed by metadata operations. 967c71ee78SEric Sandeen * 2) The device logical sector size 977c71ee78SEric Sandeen * 987c71ee78SEric Sandeen * The first is specified at mkfs time, and is stored on-disk in the 997c71ee78SEric Sandeen * superblock's sb_sectsize. 1007c71ee78SEric Sandeen * 1017c71ee78SEric Sandeen * The latter is derived from the underlying device, and controls direct IO 1027c71ee78SEric Sandeen * alignment constraints. 1037c71ee78SEric Sandeen */ 104c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 105c59d87c4SChristoph Hellwig dev_t bt_dev; 106c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 107c59d87c4SChristoph Hellwig struct backing_dev_info *bt_bdi; 108c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 1096da54179SEric Sandeen unsigned int bt_meta_sectorsize; 1106da54179SEric Sandeen size_t bt_meta_sectormask; 1117c71ee78SEric Sandeen size_t bt_logical_sectorsize; 1127c71ee78SEric Sandeen size_t bt_logical_sectormask; 113c59d87c4SChristoph Hellwig 114c59d87c4SChristoph Hellwig /* LRU control structures */ 115c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 116e80dfa19SDave Chinner struct list_lru bt_lru; 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 122c3f8fc73SDave Chinner 123c59d87c4SChristoph Hellwig #define XB_PAGES 2 124c59d87c4SChristoph Hellwig 125cbb7baabSDave Chinner struct xfs_buf_map { 126cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 127cbb7baabSDave Chinner int bm_len; /* size of I/O */ 128cbb7baabSDave Chinner }; 129cbb7baabSDave Chinner 1303e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1313e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1323e85c868SDave Chinner 1331813dd64SDave Chinner struct xfs_buf_ops { 1341813dd64SDave Chinner void (*verify_read)(struct xfs_buf *); 1351813dd64SDave Chinner void (*verify_write)(struct xfs_buf *); 1361813dd64SDave Chinner }; 1371813dd64SDave Chinner 138c59d87c4SChristoph Hellwig typedef struct xfs_buf { 139c59d87c4SChristoph Hellwig /* 140c59d87c4SChristoph Hellwig * first cacheline holds all the fields needed for an uncontended cache 141c59d87c4SChristoph Hellwig * hit to be fully processed. The semaphore straddles the cacheline 142c59d87c4SChristoph Hellwig * boundary, but the counter and lock sits on the first cacheline, 143c59d87c4SChristoph Hellwig * which is the only bit that is touched if we hit the semaphore 144c59d87c4SChristoph Hellwig * fast-path on locking. 145c59d87c4SChristoph Hellwig */ 146c59d87c4SChristoph Hellwig struct rb_node b_rbnode; /* rbtree node */ 147cbb7baabSDave Chinner xfs_daddr_t b_bn; /* block number of buffer */ 1484e94b71bSDave Chinner int b_length; /* size of buffer in BBs */ 149c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 150c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 151c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 152c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 153c59d87c4SChristoph Hellwig 1546fb8a90aSCarlos Maiolino /* 1556fb8a90aSCarlos Maiolino * concurrent access to b_lru and b_lru_flags are protected by 1566fb8a90aSCarlos Maiolino * bt_lru_lock and not by b_sema 1576fb8a90aSCarlos Maiolino */ 158c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 159a4082357SDave Chinner spinlock_t b_lock; /* internal state lock */ 160a4082357SDave Chinner unsigned int b_state; /* internal state flags */ 16161be9c52SDave Chinner int b_io_error; /* internal IO error state */ 162c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 163c59d87c4SChristoph Hellwig struct list_head b_list; 164c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 165c59d87c4SChristoph Hellwig xfs_buftarg_t *b_target; /* buffer target (device) */ 166c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 167b29c70f5SBrian Foster struct work_struct b_ioend_work; 168b29c70f5SBrian Foster struct workqueue_struct *b_ioend_wq; /* I/O completion wq */ 169c59d87c4SChristoph Hellwig xfs_buf_iodone_t b_iodone; /* I/O completion function */ 170c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 171c59d87c4SChristoph Hellwig void *b_fspriv; 172c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 173c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 174c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 1753e85c868SDave Chinner struct xfs_buf_map *b_maps; /* compound buffer map */ 176d44d9bc6SMark Tinguely struct xfs_buf_map __b_map; /* inline compound buffer map */ 1773e85c868SDave Chinner int b_map_count; 178aa0e8833SDave Chinner int b_io_length; /* IO size in BBs */ 179c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 180c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 181c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 182c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 1832451337dSDave Chinner int b_error; /* error code on I/O */ 1841813dd64SDave Chinner const struct xfs_buf_ops *b_ops; 185cfb02852SDave Chinner 186c59d87c4SChristoph Hellwig #ifdef XFS_BUF_LOCK_TRACKING 187c59d87c4SChristoph Hellwig int b_last_holder; 188c59d87c4SChristoph Hellwig #endif 189c59d87c4SChristoph Hellwig } xfs_buf_t; 190c59d87c4SChristoph Hellwig 191c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 1923e85c868SDave Chinner struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, 1933e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 1943e85c868SDave Chinner xfs_buf_flags_t flags, struct xfs_buf *new_bp); 1953e85c868SDave Chinner 1963e85c868SDave Chinner static inline struct xfs_buf * 1973e85c868SDave Chinner xfs_incore( 1983e85c868SDave Chinner struct xfs_buftarg *target, 1993e85c868SDave Chinner xfs_daddr_t blkno, 2003e85c868SDave Chinner size_t numblks, 2013e85c868SDave Chinner xfs_buf_flags_t flags) 2023e85c868SDave Chinner { 2033e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2043e85c868SDave Chinner return _xfs_buf_find(target, &map, 1, flags, NULL); 2053e85c868SDave Chinner } 2063e85c868SDave Chinner 2073e85c868SDave Chinner struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, 2083e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2093e85c868SDave Chinner xfs_buf_flags_t flags); 2103e85c868SDave Chinner 2113e85c868SDave Chinner static inline struct xfs_buf * 2123e85c868SDave Chinner xfs_buf_alloc( 2133e85c868SDave Chinner struct xfs_buftarg *target, 2143e85c868SDave Chinner xfs_daddr_t blkno, 2153e85c868SDave Chinner size_t numblks, 2163e85c868SDave Chinner xfs_buf_flags_t flags) 2173e85c868SDave Chinner { 2183e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2193e85c868SDave Chinner return _xfs_buf_alloc(target, &map, 1, flags); 2203e85c868SDave Chinner } 221c59d87c4SChristoph Hellwig 2226dde2707SDave Chinner struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, 2236dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2246dde2707SDave Chinner xfs_buf_flags_t flags); 2256dde2707SDave Chinner struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, 2266dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2271813dd64SDave Chinner xfs_buf_flags_t flags, 2281813dd64SDave Chinner const struct xfs_buf_ops *ops); 2296dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 230c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2311813dd64SDave Chinner const struct xfs_buf_ops *ops); 2326dde2707SDave Chinner 2336dde2707SDave Chinner static inline struct xfs_buf * 2346dde2707SDave Chinner xfs_buf_get( 2356dde2707SDave Chinner struct xfs_buftarg *target, 2366dde2707SDave Chinner xfs_daddr_t blkno, 2376dde2707SDave Chinner size_t numblks, 2386dde2707SDave Chinner xfs_buf_flags_t flags) 2396dde2707SDave Chinner { 2406dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2416dde2707SDave Chinner return xfs_buf_get_map(target, &map, 1, flags); 2426dde2707SDave Chinner } 2436dde2707SDave Chinner 2446dde2707SDave Chinner static inline struct xfs_buf * 2456dde2707SDave Chinner xfs_buf_read( 2466dde2707SDave Chinner struct xfs_buftarg *target, 2476dde2707SDave Chinner xfs_daddr_t blkno, 2486dde2707SDave Chinner size_t numblks, 249c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2501813dd64SDave Chinner const struct xfs_buf_ops *ops) 2516dde2707SDave Chinner { 2526dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2531813dd64SDave Chinner return xfs_buf_read_map(target, &map, 1, flags, ops); 2546dde2707SDave Chinner } 2556dde2707SDave Chinner 2566dde2707SDave Chinner static inline void 2576dde2707SDave Chinner xfs_buf_readahead( 2586dde2707SDave Chinner struct xfs_buftarg *target, 2596dde2707SDave Chinner xfs_daddr_t blkno, 260c3f8fc73SDave Chinner size_t numblks, 2611813dd64SDave Chinner const struct xfs_buf_ops *ops) 2626dde2707SDave Chinner { 2636dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2641813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2656dde2707SDave Chinner } 266c59d87c4SChristoph Hellwig 267e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks); 268e70b73f8SDave Chinner void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks); 269e70b73f8SDave Chinner int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length); 270e70b73f8SDave Chinner 271e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, 272e70b73f8SDave Chinner int flags); 273ba372674SDave Chinner int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr, 274ba372674SDave Chinner size_t numblks, int flags, struct xfs_buf **bpp, 2751813dd64SDave Chinner const struct xfs_buf_ops *ops); 276e70b73f8SDave Chinner void xfs_buf_hold(struct xfs_buf *bp); 277c59d87c4SChristoph Hellwig 278c59d87c4SChristoph Hellwig /* Releasing Buffers */ 279c59d87c4SChristoph Hellwig extern void xfs_buf_free(xfs_buf_t *); 280c59d87c4SChristoph Hellwig extern void xfs_buf_rele(xfs_buf_t *); 281c59d87c4SChristoph Hellwig 282c59d87c4SChristoph Hellwig /* Locking and Unlocking Buffers */ 283c59d87c4SChristoph Hellwig extern int xfs_buf_trylock(xfs_buf_t *); 284c59d87c4SChristoph Hellwig extern void xfs_buf_lock(xfs_buf_t *); 285c59d87c4SChristoph Hellwig extern void xfs_buf_unlock(xfs_buf_t *); 286c59d87c4SChristoph Hellwig #define xfs_buf_islocked(bp) \ 287c59d87c4SChristoph Hellwig ((bp)->b_sema.count <= 0) 288c59d87c4SChristoph Hellwig 289c59d87c4SChristoph Hellwig /* Buffer Read and Write Routines */ 290c2b006c1SChristoph Hellwig extern int xfs_bwrite(struct xfs_buf *bp); 291e8aaba9aSDave Chinner extern void xfs_buf_ioend(struct xfs_buf *bp); 292c59d87c4SChristoph Hellwig extern void xfs_buf_ioerror(xfs_buf_t *, int); 293901796afSChristoph Hellwig extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); 294595bff75SDave Chinner extern void xfs_buf_submit(struct xfs_buf *bp); 295595bff75SDave Chinner extern int xfs_buf_submit_wait(struct xfs_buf *bp); 296c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 297c59d87c4SChristoph Hellwig xfs_buf_rw_t); 298c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 299c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 300c59d87c4SChristoph Hellwig 301c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 302c59d87c4SChristoph Hellwig extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); 303c59d87c4SChristoph Hellwig 304c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 30543ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 30643ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 30743ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 308c59d87c4SChristoph Hellwig 309c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 310c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 311c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 312c59d87c4SChristoph Hellwig 313c59d87c4SChristoph Hellwig #define XFS_BUF_ZEROFLAGS(bp) \ 31443ff2122SChristoph Hellwig ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \ 315ac8809f9SDave Chinner XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \ 316ac8809f9SDave Chinner XBF_WRITE_FAIL)) 317c59d87c4SChristoph Hellwig 318c59d87c4SChristoph Hellwig void xfs_buf_stale(struct xfs_buf *bp); 319c59d87c4SChristoph Hellwig #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) 320c59d87c4SChristoph Hellwig #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) 321c59d87c4SChristoph Hellwig 322c59d87c4SChristoph Hellwig #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) 323c59d87c4SChristoph Hellwig #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) 324c59d87c4SChristoph Hellwig #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) 325c59d87c4SChristoph Hellwig 326c59d87c4SChristoph Hellwig #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) 327c59d87c4SChristoph Hellwig #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) 328c59d87c4SChristoph Hellwig #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) 329c59d87c4SChristoph Hellwig 330c59d87c4SChristoph Hellwig #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) 331c59d87c4SChristoph Hellwig #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) 332c59d87c4SChristoph Hellwig #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) 333c59d87c4SChristoph Hellwig 334c59d87c4SChristoph Hellwig #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) 335c59d87c4SChristoph Hellwig #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) 336c59d87c4SChristoph Hellwig #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) 337c59d87c4SChristoph Hellwig 338cbb7baabSDave Chinner /* 339cbb7baabSDave Chinner * These macros use the IO block map rather than b_bn. b_bn is now really 340cbb7baabSDave Chinner * just for the buffer cache index for cached buffers. As IO does not use b_bn 341cbb7baabSDave Chinner * anymore, uncached buffers do not use b_bn at all and hence must modify the IO 342cbb7baabSDave Chinner * map directly. Uncached buffers are not allowed to be discontiguous, so this 343cbb7baabSDave Chinner * is safe to do. 344cbb7baabSDave Chinner * 345cbb7baabSDave Chinner * In future, uncached buffers will pass the block number directly to the io 346cbb7baabSDave Chinner * request function and hence these macros will go away at that point. 347cbb7baabSDave Chinner */ 348d44d9bc6SMark Tinguely #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) 349d44d9bc6SMark Tinguely #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) 350c59d87c4SChristoph Hellwig 35138f23232SChristoph Hellwig static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) 352c59d87c4SChristoph Hellwig { 353c59d87c4SChristoph Hellwig atomic_set(&bp->b_lru_ref, lru_ref); 354c59d87c4SChristoph Hellwig } 355c59d87c4SChristoph Hellwig 356c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 357c59d87c4SChristoph Hellwig { 358c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 359c59d87c4SChristoph Hellwig } 360c59d87c4SChristoph Hellwig 361c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 362c59d87c4SChristoph Hellwig { 363c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 364c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 365c59d87c4SChristoph Hellwig } 366c59d87c4SChristoph Hellwig 36751582170SEric Sandeen static inline int 36851582170SEric Sandeen xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 36951582170SEric Sandeen { 37051582170SEric Sandeen return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), 37151582170SEric Sandeen cksum_offset); 37251582170SEric Sandeen } 37351582170SEric Sandeen 374f1dbcd7eSEric Sandeen static inline void 375f1dbcd7eSEric Sandeen xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 376f1dbcd7eSEric Sandeen { 377f1dbcd7eSEric Sandeen xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), 378f1dbcd7eSEric Sandeen cksum_offset); 379f1dbcd7eSEric Sandeen } 380f1dbcd7eSEric Sandeen 381c59d87c4SChristoph Hellwig /* 382c59d87c4SChristoph Hellwig * Handling of buftargs. 383c59d87c4SChristoph Hellwig */ 384c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 38534dcefd7SEric Sandeen struct block_device *); 386c59d87c4SChristoph Hellwig extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); 387c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 388a96c4151SEric Sandeen extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int); 389c59d87c4SChristoph Hellwig 390c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 391c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 392c59d87c4SChristoph Hellwig 393c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 394