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> 26c94c2acfSMatthew Wilcox #include <linux/dax.h> 27c59d87c4SChristoph Hellwig #include <linux/buffer_head.h> 28c59d87c4SChristoph Hellwig #include <linux/uio.h> 29e80dfa19SDave Chinner #include <linux/list_lru.h> 30c59d87c4SChristoph Hellwig 31c59d87c4SChristoph Hellwig /* 32c59d87c4SChristoph Hellwig * Base types 33c59d87c4SChristoph Hellwig */ 34c59d87c4SChristoph Hellwig 35c59d87c4SChristoph Hellwig #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) 36c59d87c4SChristoph Hellwig 37c59d87c4SChristoph Hellwig typedef enum { 38c59d87c4SChristoph Hellwig XBRW_READ = 1, /* transfer into target memory */ 39c59d87c4SChristoph Hellwig XBRW_WRITE = 2, /* transfer from target memory */ 40c59d87c4SChristoph Hellwig XBRW_ZERO = 3, /* Zero target memory */ 41c59d87c4SChristoph Hellwig } xfs_buf_rw_t; 42c59d87c4SChristoph Hellwig 43c59d87c4SChristoph Hellwig #define XBF_READ (1 << 0) /* buffer intended for reading from device */ 44c59d87c4SChristoph Hellwig #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ 45c59d87c4SChristoph Hellwig #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ 46c891c30aSBrian Foster #define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */ 47c59d87c4SChristoph Hellwig #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ 48c59d87c4SChristoph Hellwig #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ 4943ff2122SChristoph Hellwig #define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ 50ac8809f9SDave Chinner #define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */ 51c59d87c4SChristoph Hellwig 52c59d87c4SChristoph Hellwig /* I/O hints for the BIO layer */ 53c59d87c4SChristoph Hellwig #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ 54c59d87c4SChristoph Hellwig #define XBF_FUA (1 << 11)/* force cache write through mode */ 55c59d87c4SChristoph Hellwig #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ 56c59d87c4SChristoph Hellwig 57c59d87c4SChristoph Hellwig /* flags used only as arguments to access routines */ 58c59d87c4SChristoph Hellwig #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ 59611c9946SDave Chinner #define XBF_UNMAPPED (1 << 17)/* do not map the buffer */ 60c59d87c4SChristoph Hellwig 61c59d87c4SChristoph Hellwig /* flags used only internally */ 62c59d87c4SChristoph Hellwig #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ 63c59d87c4SChristoph Hellwig #define _XBF_KMEM (1 << 21)/* backed by heap memory */ 6443ff2122SChristoph Hellwig #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ 65cbb7baabSDave Chinner #define _XBF_COMPOUND (1 << 23)/* compound buffer */ 66c59d87c4SChristoph Hellwig 67c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 68c59d87c4SChristoph Hellwig 69c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 70c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 71c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 72c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 731247ec4cSEric Sandeen { XBF_NO_IOACCT, "NO_IOACCT" }, \ 74c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 75c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 76c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 77ac8809f9SDave Chinner { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ 78c59d87c4SChristoph Hellwig { XBF_SYNCIO, "SYNCIO" }, \ 79c59d87c4SChristoph Hellwig { XBF_FUA, "FUA" }, \ 80c59d87c4SChristoph Hellwig { XBF_FLUSH, "FLUSH" }, \ 81a8acad70SDave Chinner { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\ 82611c9946SDave Chinner { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ 83c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 84c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 85cbb7baabSDave Chinner { _XBF_DELWRI_Q, "DELWRI_Q" }, \ 8663db7c81SBrian Foster { _XBF_COMPOUND, "COMPOUND" } 87a4082357SDave Chinner 88ac8809f9SDave Chinner 89a4082357SDave Chinner /* 90a4082357SDave Chinner * Internal state flags. 91a4082357SDave Chinner */ 92a4082357SDave Chinner #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ 9363db7c81SBrian Foster #define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */ 94c59d87c4SChristoph Hellwig 957c71ee78SEric Sandeen /* 967c71ee78SEric Sandeen * The xfs_buftarg contains 2 notions of "sector size" - 977c71ee78SEric Sandeen * 987c71ee78SEric Sandeen * 1) The metadata sector size, which is the minimum unit and 997c71ee78SEric Sandeen * alignment of IO which will be performed by metadata operations. 1007c71ee78SEric Sandeen * 2) The device logical sector size 1017c71ee78SEric Sandeen * 1027c71ee78SEric Sandeen * The first is specified at mkfs time, and is stored on-disk in the 1037c71ee78SEric Sandeen * superblock's sb_sectsize. 1047c71ee78SEric Sandeen * 1057c71ee78SEric Sandeen * The latter is derived from the underlying device, and controls direct IO 1067c71ee78SEric Sandeen * alignment constraints. 1077c71ee78SEric Sandeen */ 108c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 109c59d87c4SChristoph Hellwig dev_t bt_dev; 110c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 111486aff5eSDan Williams struct dax_device *bt_daxdev; 112c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 1136da54179SEric Sandeen unsigned int bt_meta_sectorsize; 1146da54179SEric Sandeen size_t bt_meta_sectormask; 1157c71ee78SEric Sandeen size_t bt_logical_sectorsize; 1167c71ee78SEric Sandeen size_t bt_logical_sectormask; 117c59d87c4SChristoph Hellwig 118c59d87c4SChristoph Hellwig /* LRU control structures */ 119c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 120e80dfa19SDave Chinner struct list_lru bt_lru; 1219c7504aaSBrian Foster 1229c7504aaSBrian Foster struct percpu_counter bt_io_count; 123c59d87c4SChristoph Hellwig } xfs_buftarg_t; 124c59d87c4SChristoph Hellwig 125c59d87c4SChristoph Hellwig struct xfs_buf; 126c59d87c4SChristoph Hellwig typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); 127c59d87c4SChristoph Hellwig 128c3f8fc73SDave Chinner 129c59d87c4SChristoph Hellwig #define XB_PAGES 2 130c59d87c4SChristoph Hellwig 131cbb7baabSDave Chinner struct xfs_buf_map { 132cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 133cbb7baabSDave Chinner int bm_len; /* size of I/O */ 134cbb7baabSDave Chinner }; 135cbb7baabSDave Chinner 1363e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1373e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1383e85c868SDave Chinner 1391813dd64SDave Chinner struct xfs_buf_ops { 140233135b7SEric Sandeen char *name; 1411813dd64SDave Chinner void (*verify_read)(struct xfs_buf *); 1421813dd64SDave Chinner void (*verify_write)(struct xfs_buf *); 143b5572597SDarrick J. Wong xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp); 1441813dd64SDave Chinner }; 1451813dd64SDave Chinner 146c59d87c4SChristoph Hellwig typedef struct xfs_buf { 147c59d87c4SChristoph Hellwig /* 148c59d87c4SChristoph Hellwig * first cacheline holds all the fields needed for an uncontended cache 149c59d87c4SChristoph Hellwig * hit to be fully processed. The semaphore straddles the cacheline 150c59d87c4SChristoph Hellwig * boundary, but the counter and lock sits on the first cacheline, 151c59d87c4SChristoph Hellwig * which is the only bit that is touched if we hit the semaphore 152c59d87c4SChristoph Hellwig * fast-path on locking. 153c59d87c4SChristoph Hellwig */ 1546031e73aSLucas Stach struct rhash_head b_rhash_head; /* pag buffer hash node */ 155cbb7baabSDave Chinner xfs_daddr_t b_bn; /* block number of buffer */ 1564e94b71bSDave Chinner int b_length; /* size of buffer in BBs */ 157c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 158c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 159c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 160c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 161c59d87c4SChristoph Hellwig 1626fb8a90aSCarlos Maiolino /* 1636fb8a90aSCarlos Maiolino * concurrent access to b_lru and b_lru_flags are protected by 1646fb8a90aSCarlos Maiolino * bt_lru_lock and not by b_sema 1656fb8a90aSCarlos Maiolino */ 166c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 167a4082357SDave Chinner spinlock_t b_lock; /* internal state lock */ 168a4082357SDave Chinner unsigned int b_state; /* internal state flags */ 16961be9c52SDave Chinner int b_io_error; /* internal IO error state */ 170c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 171c59d87c4SChristoph Hellwig struct list_head b_list; 172c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 173c59d87c4SChristoph Hellwig xfs_buftarg_t *b_target; /* buffer target (device) */ 174c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 175b29c70f5SBrian Foster struct work_struct b_ioend_work; 176b29c70f5SBrian Foster struct workqueue_struct *b_ioend_wq; /* I/O completion wq */ 177c59d87c4SChristoph Hellwig xfs_buf_iodone_t b_iodone; /* I/O completion function */ 178c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 179fb1755a6SCarlos Maiolino void *b_log_item; 180643c8c05SCarlos Maiolino struct list_head b_li_list; /* Log items list head */ 181c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 182c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 183c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 1843e85c868SDave Chinner struct xfs_buf_map *b_maps; /* compound buffer map */ 185d44d9bc6SMark Tinguely struct xfs_buf_map __b_map; /* inline compound buffer map */ 1863e85c868SDave Chinner int b_map_count; 187aa0e8833SDave Chinner int b_io_length; /* IO size in BBs */ 188c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 189c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 190c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 191c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 1922451337dSDave Chinner int b_error; /* error code on I/O */ 193a5ea70d2SCarlos Maiolino 194a5ea70d2SCarlos Maiolino /* 195a5ea70d2SCarlos Maiolino * async write failure retry count. Initialised to zero on the first 196a5ea70d2SCarlos Maiolino * failure, then when it exceeds the maximum configured without a 197a5ea70d2SCarlos Maiolino * success the write is considered to be failed permanently and the 198a5ea70d2SCarlos Maiolino * iodone handler will take appropriate action. 199a5ea70d2SCarlos Maiolino * 200a5ea70d2SCarlos Maiolino * For retry timeouts, we record the jiffie of the first failure. This 201a5ea70d2SCarlos Maiolino * means that we can change the retry timeout for buffers already under 202a5ea70d2SCarlos Maiolino * I/O and thus avoid getting stuck in a retry loop with a long timeout. 203a5ea70d2SCarlos Maiolino * 204a5ea70d2SCarlos Maiolino * last_error is used to ensure that we are getting repeated errors, not 205a5ea70d2SCarlos Maiolino * different errors. e.g. a block device might change ENOSPC to EIO when 206a5ea70d2SCarlos Maiolino * a failure timeout occurs, so we want to re-initialise the error 207a5ea70d2SCarlos Maiolino * retry behaviour appropriately when that happens. 208a5ea70d2SCarlos Maiolino */ 209a5ea70d2SCarlos Maiolino int b_retries; 210a5ea70d2SCarlos Maiolino unsigned long b_first_retry_time; /* in jiffies */ 211a5ea70d2SCarlos Maiolino int b_last_error; 212a5ea70d2SCarlos Maiolino 2131813dd64SDave Chinner const struct xfs_buf_ops *b_ops; 214cfb02852SDave Chinner 215c59d87c4SChristoph Hellwig #ifdef XFS_BUF_LOCK_TRACKING 216c59d87c4SChristoph Hellwig int b_last_holder; 217c59d87c4SChristoph Hellwig #endif 218c59d87c4SChristoph Hellwig } xfs_buf_t; 219c59d87c4SChristoph Hellwig 220c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 2213e85c868SDave Chinner struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, 2223e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2233e85c868SDave Chinner xfs_buf_flags_t flags, struct xfs_buf *new_bp); 2243e85c868SDave Chinner 2253e85c868SDave Chinner static inline struct xfs_buf * 2263e85c868SDave Chinner xfs_incore( 2273e85c868SDave Chinner struct xfs_buftarg *target, 2283e85c868SDave Chinner xfs_daddr_t blkno, 2293e85c868SDave Chinner size_t numblks, 2303e85c868SDave Chinner xfs_buf_flags_t flags) 2313e85c868SDave Chinner { 2323e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2333e85c868SDave Chinner return _xfs_buf_find(target, &map, 1, flags, NULL); 2343e85c868SDave Chinner } 2353e85c868SDave Chinner 2363e85c868SDave Chinner struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, 2373e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2383e85c868SDave Chinner xfs_buf_flags_t flags); 2393e85c868SDave Chinner 2403e85c868SDave Chinner static inline struct xfs_buf * 2413e85c868SDave Chinner xfs_buf_alloc( 2423e85c868SDave Chinner struct xfs_buftarg *target, 2433e85c868SDave Chinner xfs_daddr_t blkno, 2443e85c868SDave Chinner size_t numblks, 2453e85c868SDave Chinner xfs_buf_flags_t flags) 2463e85c868SDave Chinner { 2473e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2483e85c868SDave Chinner return _xfs_buf_alloc(target, &map, 1, flags); 2493e85c868SDave Chinner } 250c59d87c4SChristoph Hellwig 2516dde2707SDave Chinner struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, 2526dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2536dde2707SDave Chinner xfs_buf_flags_t flags); 2546dde2707SDave Chinner struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, 2556dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2561813dd64SDave Chinner xfs_buf_flags_t flags, 2571813dd64SDave Chinner const struct xfs_buf_ops *ops); 2586dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 259c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2601813dd64SDave Chinner const struct xfs_buf_ops *ops); 2616dde2707SDave Chinner 2626dde2707SDave Chinner static inline struct xfs_buf * 2636dde2707SDave Chinner xfs_buf_get( 2646dde2707SDave Chinner struct xfs_buftarg *target, 2656dde2707SDave Chinner xfs_daddr_t blkno, 2666dde2707SDave Chinner size_t numblks, 2676dde2707SDave Chinner xfs_buf_flags_t flags) 2686dde2707SDave Chinner { 2696dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2706dde2707SDave Chinner return xfs_buf_get_map(target, &map, 1, flags); 2716dde2707SDave Chinner } 2726dde2707SDave Chinner 2736dde2707SDave Chinner static inline struct xfs_buf * 2746dde2707SDave Chinner xfs_buf_read( 2756dde2707SDave Chinner struct xfs_buftarg *target, 2766dde2707SDave Chinner xfs_daddr_t blkno, 2776dde2707SDave Chinner size_t numblks, 278c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2791813dd64SDave Chinner const struct xfs_buf_ops *ops) 2806dde2707SDave Chinner { 2816dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2821813dd64SDave Chinner return xfs_buf_read_map(target, &map, 1, flags, ops); 2836dde2707SDave Chinner } 2846dde2707SDave Chinner 2856dde2707SDave Chinner static inline void 2866dde2707SDave Chinner xfs_buf_readahead( 2876dde2707SDave Chinner struct xfs_buftarg *target, 2886dde2707SDave Chinner xfs_daddr_t blkno, 289c3f8fc73SDave Chinner size_t numblks, 2901813dd64SDave Chinner const struct xfs_buf_ops *ops) 2916dde2707SDave Chinner { 2926dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2931813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2946dde2707SDave Chinner } 295c59d87c4SChristoph Hellwig 296e70b73f8SDave Chinner void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks); 297e70b73f8SDave Chinner int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length); 298e70b73f8SDave Chinner 299e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, 300e70b73f8SDave Chinner int flags); 301ba372674SDave Chinner int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr, 302ba372674SDave Chinner size_t numblks, int flags, struct xfs_buf **bpp, 3031813dd64SDave Chinner const struct xfs_buf_ops *ops); 304e70b73f8SDave Chinner void xfs_buf_hold(struct xfs_buf *bp); 305c59d87c4SChristoph Hellwig 306c59d87c4SChristoph Hellwig /* Releasing Buffers */ 307c59d87c4SChristoph Hellwig extern void xfs_buf_free(xfs_buf_t *); 308c59d87c4SChristoph Hellwig extern void xfs_buf_rele(xfs_buf_t *); 309c59d87c4SChristoph Hellwig 310c59d87c4SChristoph Hellwig /* Locking and Unlocking Buffers */ 311c59d87c4SChristoph Hellwig extern int xfs_buf_trylock(xfs_buf_t *); 312c59d87c4SChristoph Hellwig extern void xfs_buf_lock(xfs_buf_t *); 313c59d87c4SChristoph Hellwig extern void xfs_buf_unlock(xfs_buf_t *); 314c59d87c4SChristoph Hellwig #define xfs_buf_islocked(bp) \ 315c59d87c4SChristoph Hellwig ((bp)->b_sema.count <= 0) 316c59d87c4SChristoph Hellwig 317c59d87c4SChristoph Hellwig /* Buffer Read and Write Routines */ 318c2b006c1SChristoph Hellwig extern int xfs_bwrite(struct xfs_buf *bp); 319e8aaba9aSDave Chinner extern void xfs_buf_ioend(struct xfs_buf *bp); 32031ca03c9SDarrick J. Wong extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error, 32131ca03c9SDarrick J. Wong xfs_failaddr_t failaddr); 32231ca03c9SDarrick J. Wong #define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address) 323901796afSChristoph Hellwig extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); 324595bff75SDave Chinner extern void xfs_buf_submit(struct xfs_buf *bp); 325595bff75SDave Chinner extern int xfs_buf_submit_wait(struct xfs_buf *bp); 326c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 327c59d87c4SChristoph Hellwig xfs_buf_rw_t); 328c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 329c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 330c59d87c4SChristoph Hellwig 331c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 33288ee2df7SChristoph Hellwig extern void *xfs_buf_offset(struct xfs_buf *, size_t); 3335cfd28b6SDave Chinner extern void xfs_buf_stale(struct xfs_buf *bp); 334c59d87c4SChristoph Hellwig 335c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 33620e8a063SBrian Foster extern void xfs_buf_delwri_cancel(struct list_head *); 33743ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 33843ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 33943ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 3407912e7feSBrian Foster extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *); 341c59d87c4SChristoph Hellwig 342c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 343c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 344c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 345c59d87c4SChristoph Hellwig 346cbb7baabSDave Chinner /* 347cbb7baabSDave Chinner * These macros use the IO block map rather than b_bn. b_bn is now really 348cbb7baabSDave Chinner * just for the buffer cache index for cached buffers. As IO does not use b_bn 349cbb7baabSDave Chinner * anymore, uncached buffers do not use b_bn at all and hence must modify the IO 350cbb7baabSDave Chinner * map directly. Uncached buffers are not allowed to be discontiguous, so this 351cbb7baabSDave Chinner * is safe to do. 352cbb7baabSDave Chinner * 353cbb7baabSDave Chinner * In future, uncached buffers will pass the block number directly to the io 354cbb7baabSDave Chinner * request function and hence these macros will go away at that point. 355cbb7baabSDave Chinner */ 356d44d9bc6SMark Tinguely #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) 357d44d9bc6SMark Tinguely #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) 358c59d87c4SChristoph Hellwig 3597561d27eSBrian Foster void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); 360c59d87c4SChristoph Hellwig 361c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 362c59d87c4SChristoph Hellwig { 363c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 364c59d87c4SChristoph Hellwig } 365c59d87c4SChristoph Hellwig 366c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 367c59d87c4SChristoph Hellwig { 368c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 369c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 370c59d87c4SChristoph Hellwig } 371c59d87c4SChristoph Hellwig 37251582170SEric Sandeen static inline int 37351582170SEric Sandeen xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 37451582170SEric Sandeen { 37551582170SEric Sandeen return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), 37651582170SEric Sandeen cksum_offset); 37751582170SEric Sandeen } 37851582170SEric Sandeen 379f1dbcd7eSEric Sandeen static inline void 380f1dbcd7eSEric Sandeen xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 381f1dbcd7eSEric Sandeen { 382f1dbcd7eSEric Sandeen xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), 383f1dbcd7eSEric Sandeen cksum_offset); 384f1dbcd7eSEric Sandeen } 385f1dbcd7eSEric Sandeen 386c59d87c4SChristoph Hellwig /* 387c59d87c4SChristoph Hellwig * Handling of buftargs. 388c59d87c4SChristoph Hellwig */ 389c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 390486aff5eSDan Williams struct block_device *, struct dax_device *); 391a1f69417SEric Sandeen extern void xfs_free_buftarg(struct xfs_buftarg *); 392c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 393a96c4151SEric Sandeen extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int); 394c59d87c4SChristoph Hellwig 395c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 396c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 397c59d87c4SChristoph Hellwig 398c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 399