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 */ 669c7504aaSBrian Foster #define _XBF_IN_FLIGHT (1 << 25) /* I/O in flight, for accounting purposes */ 67c59d87c4SChristoph Hellwig 68c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 69c59d87c4SChristoph Hellwig 70c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 71c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 72c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 73c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 741247ec4cSEric Sandeen { XBF_NO_IOACCT, "NO_IOACCT" }, \ 75c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 76c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 77c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 78ac8809f9SDave Chinner { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ 79c59d87c4SChristoph Hellwig { XBF_SYNCIO, "SYNCIO" }, \ 80c59d87c4SChristoph Hellwig { XBF_FUA, "FUA" }, \ 81c59d87c4SChristoph Hellwig { XBF_FLUSH, "FLUSH" }, \ 82a8acad70SDave Chinner { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\ 83611c9946SDave Chinner { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ 84c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 85c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 86cbb7baabSDave Chinner { _XBF_DELWRI_Q, "DELWRI_Q" }, \ 879c7504aaSBrian Foster { _XBF_COMPOUND, "COMPOUND" }, \ 889c7504aaSBrian Foster { _XBF_IN_FLIGHT, "IN_FLIGHT" } 89a4082357SDave Chinner 90ac8809f9SDave Chinner 91a4082357SDave Chinner /* 92a4082357SDave Chinner * Internal state flags. 93a4082357SDave Chinner */ 94a4082357SDave Chinner #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ 95c59d87c4SChristoph Hellwig 967c71ee78SEric Sandeen /* 977c71ee78SEric Sandeen * The xfs_buftarg contains 2 notions of "sector size" - 987c71ee78SEric Sandeen * 997c71ee78SEric Sandeen * 1) The metadata sector size, which is the minimum unit and 1007c71ee78SEric Sandeen * alignment of IO which will be performed by metadata operations. 1017c71ee78SEric Sandeen * 2) The device logical sector size 1027c71ee78SEric Sandeen * 1037c71ee78SEric Sandeen * The first is specified at mkfs time, and is stored on-disk in the 1047c71ee78SEric Sandeen * superblock's sb_sectsize. 1057c71ee78SEric Sandeen * 1067c71ee78SEric Sandeen * The latter is derived from the underlying device, and controls direct IO 1077c71ee78SEric Sandeen * alignment constraints. 1087c71ee78SEric Sandeen */ 109c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 110c59d87c4SChristoph Hellwig dev_t bt_dev; 111c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 112c59d87c4SChristoph Hellwig struct backing_dev_info *bt_bdi; 113c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 1146da54179SEric Sandeen unsigned int bt_meta_sectorsize; 1156da54179SEric Sandeen size_t bt_meta_sectormask; 1167c71ee78SEric Sandeen size_t bt_logical_sectorsize; 1177c71ee78SEric Sandeen size_t bt_logical_sectormask; 118c59d87c4SChristoph Hellwig 119c59d87c4SChristoph Hellwig /* LRU control structures */ 120c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 121e80dfa19SDave Chinner struct list_lru bt_lru; 1229c7504aaSBrian Foster 1239c7504aaSBrian Foster struct percpu_counter bt_io_count; 124c59d87c4SChristoph Hellwig } xfs_buftarg_t; 125c59d87c4SChristoph Hellwig 126c59d87c4SChristoph Hellwig struct xfs_buf; 127c59d87c4SChristoph Hellwig typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); 128c59d87c4SChristoph Hellwig 129c3f8fc73SDave Chinner 130c59d87c4SChristoph Hellwig #define XB_PAGES 2 131c59d87c4SChristoph Hellwig 132cbb7baabSDave Chinner struct xfs_buf_map { 133cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 134cbb7baabSDave Chinner int bm_len; /* size of I/O */ 135cbb7baabSDave Chinner }; 136cbb7baabSDave Chinner 1373e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1383e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1393e85c868SDave Chinner 1401813dd64SDave Chinner struct xfs_buf_ops { 141233135b7SEric Sandeen char *name; 1421813dd64SDave Chinner void (*verify_read)(struct xfs_buf *); 1431813dd64SDave Chinner void (*verify_write)(struct xfs_buf *); 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 */ 154c59d87c4SChristoph Hellwig struct rb_node b_rbnode; /* rbtree 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 */ 179c59d87c4SChristoph Hellwig void *b_fspriv; 180c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 181c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 182c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 1833e85c868SDave Chinner struct xfs_buf_map *b_maps; /* compound buffer map */ 184d44d9bc6SMark Tinguely struct xfs_buf_map __b_map; /* inline compound buffer map */ 1853e85c868SDave Chinner int b_map_count; 186aa0e8833SDave Chinner int b_io_length; /* IO size in BBs */ 187c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 188c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 189c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 190c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 1912451337dSDave Chinner int b_error; /* error code on I/O */ 192a5ea70d2SCarlos Maiolino 193a5ea70d2SCarlos Maiolino /* 194a5ea70d2SCarlos Maiolino * async write failure retry count. Initialised to zero on the first 195a5ea70d2SCarlos Maiolino * failure, then when it exceeds the maximum configured without a 196a5ea70d2SCarlos Maiolino * success the write is considered to be failed permanently and the 197a5ea70d2SCarlos Maiolino * iodone handler will take appropriate action. 198a5ea70d2SCarlos Maiolino * 199a5ea70d2SCarlos Maiolino * For retry timeouts, we record the jiffie of the first failure. This 200a5ea70d2SCarlos Maiolino * means that we can change the retry timeout for buffers already under 201a5ea70d2SCarlos Maiolino * I/O and thus avoid getting stuck in a retry loop with a long timeout. 202a5ea70d2SCarlos Maiolino * 203a5ea70d2SCarlos Maiolino * last_error is used to ensure that we are getting repeated errors, not 204a5ea70d2SCarlos Maiolino * different errors. e.g. a block device might change ENOSPC to EIO when 205a5ea70d2SCarlos Maiolino * a failure timeout occurs, so we want to re-initialise the error 206a5ea70d2SCarlos Maiolino * retry behaviour appropriately when that happens. 207a5ea70d2SCarlos Maiolino */ 208a5ea70d2SCarlos Maiolino int b_retries; 209a5ea70d2SCarlos Maiolino unsigned long b_first_retry_time; /* in jiffies */ 210a5ea70d2SCarlos Maiolino int b_last_error; 211a5ea70d2SCarlos Maiolino 2121813dd64SDave Chinner const struct xfs_buf_ops *b_ops; 213cfb02852SDave Chinner 214c59d87c4SChristoph Hellwig #ifdef XFS_BUF_LOCK_TRACKING 215c59d87c4SChristoph Hellwig int b_last_holder; 216c59d87c4SChristoph Hellwig #endif 217c59d87c4SChristoph Hellwig } xfs_buf_t; 218c59d87c4SChristoph Hellwig 219c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 2203e85c868SDave Chinner struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, 2213e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2223e85c868SDave Chinner xfs_buf_flags_t flags, struct xfs_buf *new_bp); 2233e85c868SDave Chinner 2243e85c868SDave Chinner static inline struct xfs_buf * 2253e85c868SDave Chinner xfs_incore( 2263e85c868SDave Chinner struct xfs_buftarg *target, 2273e85c868SDave Chinner xfs_daddr_t blkno, 2283e85c868SDave Chinner size_t numblks, 2293e85c868SDave Chinner xfs_buf_flags_t flags) 2303e85c868SDave Chinner { 2313e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2323e85c868SDave Chinner return _xfs_buf_find(target, &map, 1, flags, NULL); 2333e85c868SDave Chinner } 2343e85c868SDave Chinner 2353e85c868SDave Chinner struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, 2363e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2373e85c868SDave Chinner xfs_buf_flags_t flags); 2383e85c868SDave Chinner 2393e85c868SDave Chinner static inline struct xfs_buf * 2403e85c868SDave Chinner xfs_buf_alloc( 2413e85c868SDave Chinner struct xfs_buftarg *target, 2423e85c868SDave Chinner xfs_daddr_t blkno, 2433e85c868SDave Chinner size_t numblks, 2443e85c868SDave Chinner xfs_buf_flags_t flags) 2453e85c868SDave Chinner { 2463e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2473e85c868SDave Chinner return _xfs_buf_alloc(target, &map, 1, flags); 2483e85c868SDave Chinner } 249c59d87c4SChristoph Hellwig 2506dde2707SDave Chinner struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, 2516dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2526dde2707SDave Chinner xfs_buf_flags_t flags); 2536dde2707SDave Chinner struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, 2546dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2551813dd64SDave Chinner xfs_buf_flags_t flags, 2561813dd64SDave Chinner const struct xfs_buf_ops *ops); 2576dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 258c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2591813dd64SDave Chinner const struct xfs_buf_ops *ops); 2606dde2707SDave Chinner 2616dde2707SDave Chinner static inline struct xfs_buf * 2626dde2707SDave Chinner xfs_buf_get( 2636dde2707SDave Chinner struct xfs_buftarg *target, 2646dde2707SDave Chinner xfs_daddr_t blkno, 2656dde2707SDave Chinner size_t numblks, 2666dde2707SDave Chinner xfs_buf_flags_t flags) 2676dde2707SDave Chinner { 2686dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2696dde2707SDave Chinner return xfs_buf_get_map(target, &map, 1, flags); 2706dde2707SDave Chinner } 2716dde2707SDave Chinner 2726dde2707SDave Chinner static inline struct xfs_buf * 2736dde2707SDave Chinner xfs_buf_read( 2746dde2707SDave Chinner struct xfs_buftarg *target, 2756dde2707SDave Chinner xfs_daddr_t blkno, 2766dde2707SDave Chinner size_t numblks, 277c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2781813dd64SDave Chinner const struct xfs_buf_ops *ops) 2796dde2707SDave Chinner { 2806dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2811813dd64SDave Chinner return xfs_buf_read_map(target, &map, 1, flags, ops); 2826dde2707SDave Chinner } 2836dde2707SDave Chinner 2846dde2707SDave Chinner static inline void 2856dde2707SDave Chinner xfs_buf_readahead( 2866dde2707SDave Chinner struct xfs_buftarg *target, 2876dde2707SDave Chinner xfs_daddr_t blkno, 288c3f8fc73SDave Chinner size_t numblks, 2891813dd64SDave Chinner const struct xfs_buf_ops *ops) 2906dde2707SDave Chinner { 2916dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2921813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2936dde2707SDave Chinner } 294c59d87c4SChristoph Hellwig 295e70b73f8SDave Chinner struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks); 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); 320c59d87c4SChristoph Hellwig extern void xfs_buf_ioerror(xfs_buf_t *, int); 321901796afSChristoph Hellwig extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); 322595bff75SDave Chinner extern void xfs_buf_submit(struct xfs_buf *bp); 323595bff75SDave Chinner extern int xfs_buf_submit_wait(struct xfs_buf *bp); 324c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 325c59d87c4SChristoph Hellwig xfs_buf_rw_t); 326c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 327c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 328c59d87c4SChristoph Hellwig 329c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 33088ee2df7SChristoph Hellwig extern void *xfs_buf_offset(struct xfs_buf *, size_t); 3315cfd28b6SDave Chinner extern void xfs_buf_stale(struct xfs_buf *bp); 332c59d87c4SChristoph Hellwig 333c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 33443ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 33543ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 33643ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 337c59d87c4SChristoph Hellwig 338c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 339c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 340c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 341c59d87c4SChristoph Hellwig 342cbb7baabSDave Chinner /* 343cbb7baabSDave Chinner * These macros use the IO block map rather than b_bn. b_bn is now really 344cbb7baabSDave Chinner * just for the buffer cache index for cached buffers. As IO does not use b_bn 345cbb7baabSDave Chinner * anymore, uncached buffers do not use b_bn at all and hence must modify the IO 346cbb7baabSDave Chinner * map directly. Uncached buffers are not allowed to be discontiguous, so this 347cbb7baabSDave Chinner * is safe to do. 348cbb7baabSDave Chinner * 349cbb7baabSDave Chinner * In future, uncached buffers will pass the block number directly to the io 350cbb7baabSDave Chinner * request function and hence these macros will go away at that point. 351cbb7baabSDave Chinner */ 352d44d9bc6SMark Tinguely #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) 353d44d9bc6SMark Tinguely #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) 354c59d87c4SChristoph Hellwig 35538f23232SChristoph Hellwig static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) 356c59d87c4SChristoph Hellwig { 357c59d87c4SChristoph Hellwig atomic_set(&bp->b_lru_ref, lru_ref); 358c59d87c4SChristoph Hellwig } 359c59d87c4SChristoph Hellwig 360c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 361c59d87c4SChristoph Hellwig { 362c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 363c59d87c4SChristoph Hellwig } 364c59d87c4SChristoph Hellwig 365c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 366c59d87c4SChristoph Hellwig { 367c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 368c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 369c59d87c4SChristoph Hellwig } 370c59d87c4SChristoph Hellwig 37151582170SEric Sandeen static inline int 37251582170SEric Sandeen xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 37351582170SEric Sandeen { 37451582170SEric Sandeen return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), 37551582170SEric Sandeen cksum_offset); 37651582170SEric Sandeen } 37751582170SEric Sandeen 378f1dbcd7eSEric Sandeen static inline void 379f1dbcd7eSEric Sandeen xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 380f1dbcd7eSEric Sandeen { 381f1dbcd7eSEric Sandeen xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), 382f1dbcd7eSEric Sandeen cksum_offset); 383f1dbcd7eSEric Sandeen } 384f1dbcd7eSEric Sandeen 385c59d87c4SChristoph Hellwig /* 386c59d87c4SChristoph Hellwig * Handling of buftargs. 387c59d87c4SChristoph Hellwig */ 388c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 38934dcefd7SEric Sandeen struct block_device *); 390c59d87c4SChristoph Hellwig extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); 391c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 392a96c4151SEric Sandeen extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int); 393c59d87c4SChristoph Hellwig 394c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 395c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 396c59d87c4SChristoph Hellwig 397c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 398