10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0 2c59d87c4SChristoph Hellwig /* 3c59d87c4SChristoph Hellwig * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4c59d87c4SChristoph Hellwig * All Rights Reserved. 5c59d87c4SChristoph Hellwig */ 6c59d87c4SChristoph Hellwig #ifndef __XFS_BUF_H__ 7c59d87c4SChristoph Hellwig #define __XFS_BUF_H__ 8c59d87c4SChristoph Hellwig 9c59d87c4SChristoph Hellwig #include <linux/list.h> 10c59d87c4SChristoph Hellwig #include <linux/types.h> 11c59d87c4SChristoph Hellwig #include <linux/spinlock.h> 12c59d87c4SChristoph Hellwig #include <linux/mm.h> 13c59d87c4SChristoph Hellwig #include <linux/fs.h> 14c94c2acfSMatthew Wilcox #include <linux/dax.h> 15c59d87c4SChristoph Hellwig #include <linux/uio.h> 16e80dfa19SDave Chinner #include <linux/list_lru.h> 17c59d87c4SChristoph Hellwig 18*231f91abSDave Chinner extern struct kmem_cache *xfs_buf_cache; 19*231f91abSDave Chinner 20c59d87c4SChristoph Hellwig /* 21c59d87c4SChristoph Hellwig * Base types 22c59d87c4SChristoph Hellwig */ 23b01d1461SDave Chinner struct xfs_buf; 24c59d87c4SChristoph Hellwig 25c59d87c4SChristoph Hellwig #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) 26c59d87c4SChristoph Hellwig 27b9b3fe15SDave Chinner #define XBF_READ (1u << 0) /* buffer intended for reading from device */ 28b9b3fe15SDave Chinner #define XBF_WRITE (1u << 1) /* buffer intended for writing to device */ 29b9b3fe15SDave Chinner #define XBF_READ_AHEAD (1u << 2) /* asynchronous read-ahead */ 30b9b3fe15SDave Chinner #define XBF_NO_IOACCT (1u << 3) /* bypass I/O accounting (non-LRU bufs) */ 31b9b3fe15SDave Chinner #define XBF_ASYNC (1u << 4) /* initiator will not wait for completion */ 32b9b3fe15SDave Chinner #define XBF_DONE (1u << 5) /* all pages in the buffer uptodate */ 33b9b3fe15SDave Chinner #define XBF_STALE (1u << 6) /* buffer has been staled, do not find it */ 34b9b3fe15SDave Chinner #define XBF_WRITE_FAIL (1u << 7) /* async writes have failed on this buffer */ 35c59d87c4SChristoph Hellwig 36f593bf14SDave Chinner /* buffer type flags for write callbacks */ 37b9b3fe15SDave Chinner #define _XBF_INODES (1u << 16)/* inode buffer */ 38b9b3fe15SDave Chinner #define _XBF_DQUOTS (1u << 17)/* dquot buffer */ 39b9b3fe15SDave Chinner #define _XBF_LOGRECOVERY (1u << 18)/* log recovery buffer */ 40c59d87c4SChristoph Hellwig 41c59d87c4SChristoph Hellwig /* flags used only internally */ 42b9b3fe15SDave Chinner #define _XBF_PAGES (1u << 20)/* backed by refcounted pages */ 43b9b3fe15SDave Chinner #define _XBF_KMEM (1u << 21)/* backed by heap memory */ 44b9b3fe15SDave Chinner #define _XBF_DELWRI_Q (1u << 22)/* buffer on a delwri queue */ 45c59d87c4SChristoph Hellwig 46f593bf14SDave Chinner /* flags used only as arguments to access routines */ 4785c73bf7SDave Chinner #define XBF_INCORE (1u << 29)/* lookup only, return if found in cache */ 48b9b3fe15SDave Chinner #define XBF_TRYLOCK (1u << 30)/* lock requested, but do not wait */ 49b9b3fe15SDave Chinner #define XBF_UNMAPPED (1u << 31)/* do not map the buffer */ 50f593bf14SDave Chinner 5185c73bf7SDave Chinner 52c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 53c59d87c4SChristoph Hellwig 54c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 55c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 56c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 57c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 581247ec4cSEric Sandeen { XBF_NO_IOACCT, "NO_IOACCT" }, \ 59c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 60c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 61c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 62ac8809f9SDave Chinner { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ 63f593bf14SDave Chinner { _XBF_INODES, "INODES" }, \ 640c7e5afbSDave Chinner { _XBF_DQUOTS, "DQUOTS" }, \ 659fe5c77cSDave Chinner { _XBF_LOGRECOVERY, "LOG_RECOVERY" }, \ 66c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 67c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 68f593bf14SDave Chinner { _XBF_DELWRI_Q, "DELWRI_Q" }, \ 69f593bf14SDave Chinner /* The following interface flags should never be set */ \ 7085c73bf7SDave Chinner { XBF_INCORE, "INCORE" }, \ 71f593bf14SDave Chinner { XBF_TRYLOCK, "TRYLOCK" }, \ 72f593bf14SDave Chinner { XBF_UNMAPPED, "UNMAPPED" } 73ac8809f9SDave Chinner 74a4082357SDave Chinner /* 75a4082357SDave Chinner * Internal state flags. 76a4082357SDave Chinner */ 77a4082357SDave Chinner #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ 7863db7c81SBrian Foster #define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */ 79c59d87c4SChristoph Hellwig 807c71ee78SEric Sandeen /* 817c71ee78SEric Sandeen * The xfs_buftarg contains 2 notions of "sector size" - 827c71ee78SEric Sandeen * 837c71ee78SEric Sandeen * 1) The metadata sector size, which is the minimum unit and 847c71ee78SEric Sandeen * alignment of IO which will be performed by metadata operations. 857c71ee78SEric Sandeen * 2) The device logical sector size 867c71ee78SEric Sandeen * 877c71ee78SEric Sandeen * The first is specified at mkfs time, and is stored on-disk in the 887c71ee78SEric Sandeen * superblock's sb_sectsize. 897c71ee78SEric Sandeen * 907c71ee78SEric Sandeen * The latter is derived from the underlying device, and controls direct IO 917c71ee78SEric Sandeen * alignment constraints. 927c71ee78SEric Sandeen */ 93c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 94c59d87c4SChristoph Hellwig dev_t bt_dev; 95c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 96486aff5eSDan Williams struct dax_device *bt_daxdev; 97cd913c76SChristoph Hellwig u64 bt_dax_part_off; 98c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 996da54179SEric Sandeen unsigned int bt_meta_sectorsize; 1006da54179SEric Sandeen size_t bt_meta_sectormask; 1017c71ee78SEric Sandeen size_t bt_logical_sectorsize; 1027c71ee78SEric Sandeen size_t bt_logical_sectormask; 103c59d87c4SChristoph Hellwig 104c59d87c4SChristoph Hellwig /* LRU control structures */ 105c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 106e80dfa19SDave Chinner struct list_lru bt_lru; 1079c7504aaSBrian Foster 1089c7504aaSBrian Foster struct percpu_counter bt_io_count; 109f9bccfccSBrian Foster struct ratelimit_state bt_ioerror_rl; 110c59d87c4SChristoph Hellwig } xfs_buftarg_t; 111c59d87c4SChristoph Hellwig 112c59d87c4SChristoph Hellwig #define XB_PAGES 2 113c59d87c4SChristoph Hellwig 114cbb7baabSDave Chinner struct xfs_buf_map { 115cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 116cbb7baabSDave Chinner int bm_len; /* size of I/O */ 117cbb7baabSDave Chinner }; 118cbb7baabSDave Chinner 1193e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1203e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1213e85c868SDave Chinner 1221813dd64SDave Chinner struct xfs_buf_ops { 123233135b7SEric Sandeen char *name; 12415baadf7SDarrick J. Wong union { 12515baadf7SDarrick J. Wong __be32 magic[2]; /* v4 and v5 on disk magic values */ 12615baadf7SDarrick J. Wong __be16 magic16[2]; /* v4 and v5 on disk magic values */ 12715baadf7SDarrick J. Wong }; 1281813dd64SDave Chinner void (*verify_read)(struct xfs_buf *); 1291813dd64SDave Chinner void (*verify_write)(struct xfs_buf *); 130b5572597SDarrick J. Wong xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp); 1311813dd64SDave Chinner }; 1321813dd64SDave Chinner 133e8222613SDave Chinner struct xfs_buf { 134c59d87c4SChristoph Hellwig /* 135c59d87c4SChristoph Hellwig * first cacheline holds all the fields needed for an uncontended cache 136c59d87c4SChristoph Hellwig * hit to be fully processed. The semaphore straddles the cacheline 137c59d87c4SChristoph Hellwig * boundary, but the counter and lock sits on the first cacheline, 138c59d87c4SChristoph Hellwig * which is the only bit that is touched if we hit the semaphore 139c59d87c4SChristoph Hellwig * fast-path on locking. 140c59d87c4SChristoph Hellwig */ 1416031e73aSLucas Stach struct rhash_head b_rhash_head; /* pag buffer hash node */ 1428cf07f3dSDave Chinner 1434c7f65aeSDave Chinner xfs_daddr_t b_rhash_key; /* buffer cache index */ 1444e94b71bSDave Chinner int b_length; /* size of buffer in BBs */ 145c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 146c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 147c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 148c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 149c59d87c4SChristoph Hellwig 1506fb8a90aSCarlos Maiolino /* 1516fb8a90aSCarlos Maiolino * concurrent access to b_lru and b_lru_flags are protected by 1526fb8a90aSCarlos Maiolino * bt_lru_lock and not by b_sema 1536fb8a90aSCarlos Maiolino */ 154c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 155a4082357SDave Chinner spinlock_t b_lock; /* internal state lock */ 156a4082357SDave Chinner unsigned int b_state; /* internal state flags */ 15761be9c52SDave Chinner int b_io_error; /* internal IO error state */ 158c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 159c59d87c4SChristoph Hellwig struct list_head b_list; 160c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 161dbd329f1SChristoph Hellwig struct xfs_mount *b_mount; 16210fb9ac1SBrian Foster struct xfs_buftarg *b_target; /* buffer target (device) */ 163c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 164b29c70f5SBrian Foster struct work_struct b_ioend_work; 165c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 166e99b4bd0SChristoph Hellwig struct xfs_buf_log_item *b_log_item; 167643c8c05SCarlos Maiolino struct list_head b_li_list; /* Log items list head */ 168c59d87c4SChristoph Hellwig struct xfs_trans *b_transp; 169c59d87c4SChristoph Hellwig struct page **b_pages; /* array of page pointers */ 170c59d87c4SChristoph Hellwig struct page *b_page_array[XB_PAGES]; /* inline pages */ 1713e85c868SDave Chinner struct xfs_buf_map *b_maps; /* compound buffer map */ 172d44d9bc6SMark Tinguely struct xfs_buf_map __b_map; /* inline compound buffer map */ 1733e85c868SDave Chinner int b_map_count; 174c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 175c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 176c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 17754cd3aa6SChristoph Hellwig unsigned int b_offset; /* page offset of b_addr, 17854cd3aa6SChristoph Hellwig only for _XBF_KMEM buffers */ 1792451337dSDave Chinner int b_error; /* error code on I/O */ 180a5ea70d2SCarlos Maiolino 181a5ea70d2SCarlos Maiolino /* 182a5ea70d2SCarlos Maiolino * async write failure retry count. Initialised to zero on the first 183a5ea70d2SCarlos Maiolino * failure, then when it exceeds the maximum configured without a 184a5ea70d2SCarlos Maiolino * success the write is considered to be failed permanently and the 185a5ea70d2SCarlos Maiolino * iodone handler will take appropriate action. 186a5ea70d2SCarlos Maiolino * 187a5ea70d2SCarlos Maiolino * For retry timeouts, we record the jiffie of the first failure. This 188a5ea70d2SCarlos Maiolino * means that we can change the retry timeout for buffers already under 189a5ea70d2SCarlos Maiolino * I/O and thus avoid getting stuck in a retry loop with a long timeout. 190a5ea70d2SCarlos Maiolino * 191a5ea70d2SCarlos Maiolino * last_error is used to ensure that we are getting repeated errors, not 192a5ea70d2SCarlos Maiolino * different errors. e.g. a block device might change ENOSPC to EIO when 193a5ea70d2SCarlos Maiolino * a failure timeout occurs, so we want to re-initialise the error 194a5ea70d2SCarlos Maiolino * retry behaviour appropriately when that happens. 195a5ea70d2SCarlos Maiolino */ 196a5ea70d2SCarlos Maiolino int b_retries; 197a5ea70d2SCarlos Maiolino unsigned long b_first_retry_time; /* in jiffies */ 198a5ea70d2SCarlos Maiolino int b_last_error; 199a5ea70d2SCarlos Maiolino 2001813dd64SDave Chinner const struct xfs_buf_ops *b_ops; 201298f3422SDave Chinner struct rcu_head b_rcu; 202e8222613SDave Chinner }; 203c59d87c4SChristoph Hellwig 204c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 2053848b5f6SDarrick J. Wong int xfs_buf_get_map(struct xfs_buftarg *target, struct xfs_buf_map *map, 2063848b5f6SDarrick J. Wong int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp); 2074ed8e27bSDarrick J. Wong int xfs_buf_read_map(struct xfs_buftarg *target, struct xfs_buf_map *map, 2084ed8e27bSDarrick J. Wong int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp, 209cdbcf82bSDarrick J. Wong const struct xfs_buf_ops *ops, xfs_failaddr_t fa); 2106dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 211c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2121813dd64SDave Chinner const struct xfs_buf_ops *ops); 2136dde2707SDave Chinner 214841263e9SDarrick J. Wong static inline int 21585c73bf7SDave Chinner xfs_buf_incore( 21685c73bf7SDave Chinner struct xfs_buftarg *target, 21785c73bf7SDave Chinner xfs_daddr_t blkno, 21885c73bf7SDave Chinner size_t numblks, 21985c73bf7SDave Chinner xfs_buf_flags_t flags, 22085c73bf7SDave Chinner struct xfs_buf **bpp) 22185c73bf7SDave Chinner { 22285c73bf7SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 22385c73bf7SDave Chinner 22485c73bf7SDave Chinner return xfs_buf_get_map(target, &map, 1, XBF_INCORE | flags, bpp); 22585c73bf7SDave Chinner } 22685c73bf7SDave Chinner 22785c73bf7SDave Chinner static inline int 2286dde2707SDave Chinner xfs_buf_get( 2296dde2707SDave Chinner struct xfs_buftarg *target, 2306dde2707SDave Chinner xfs_daddr_t blkno, 231841263e9SDarrick J. Wong size_t numblks, 232841263e9SDarrick J. Wong struct xfs_buf **bpp) 2336dde2707SDave Chinner { 2346dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2353848b5f6SDarrick J. Wong 236841263e9SDarrick J. Wong return xfs_buf_get_map(target, &map, 1, 0, bpp); 2376dde2707SDave Chinner } 2386dde2707SDave Chinner 2390e3eccceSDarrick J. Wong static inline int 2406dde2707SDave Chinner xfs_buf_read( 2416dde2707SDave Chinner struct xfs_buftarg *target, 2426dde2707SDave Chinner xfs_daddr_t blkno, 2436dde2707SDave Chinner size_t numblks, 244c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2450e3eccceSDarrick J. Wong struct xfs_buf **bpp, 2461813dd64SDave Chinner const struct xfs_buf_ops *ops) 2476dde2707SDave Chinner { 2486dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2494ed8e27bSDarrick J. Wong 250cdbcf82bSDarrick J. Wong return xfs_buf_read_map(target, &map, 1, flags, bpp, ops, 251cdbcf82bSDarrick J. Wong __builtin_return_address(0)); 2526dde2707SDave Chinner } 2536dde2707SDave Chinner 2546dde2707SDave Chinner static inline void 2556dde2707SDave Chinner xfs_buf_readahead( 2566dde2707SDave Chinner struct xfs_buftarg *target, 2576dde2707SDave Chinner xfs_daddr_t blkno, 258c3f8fc73SDave Chinner size_t numblks, 2591813dd64SDave Chinner const struct xfs_buf_ops *ops) 2606dde2707SDave Chinner { 2616dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2621813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2636dde2707SDave Chinner } 264c59d87c4SChristoph Hellwig 265b9b3fe15SDave Chinner int xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, 266b9b3fe15SDave Chinner xfs_buf_flags_t flags, struct xfs_buf **bpp); 267ba372674SDave Chinner int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr, 268b9b3fe15SDave Chinner size_t numblks, xfs_buf_flags_t flags, struct xfs_buf **bpp, 2691813dd64SDave Chinner const struct xfs_buf_ops *ops); 27026e32875SChristoph Hellwig int _xfs_buf_read(struct xfs_buf *bp, xfs_buf_flags_t flags); 271e70b73f8SDave Chinner void xfs_buf_hold(struct xfs_buf *bp); 272c59d87c4SChristoph Hellwig 273c59d87c4SChristoph Hellwig /* Releasing Buffers */ 274e8222613SDave Chinner extern void xfs_buf_rele(struct xfs_buf *); 275c59d87c4SChristoph Hellwig 276c59d87c4SChristoph Hellwig /* Locking and Unlocking Buffers */ 277e8222613SDave Chinner extern int xfs_buf_trylock(struct xfs_buf *); 278e8222613SDave Chinner extern void xfs_buf_lock(struct xfs_buf *); 279e8222613SDave Chinner extern void xfs_buf_unlock(struct xfs_buf *); 280c59d87c4SChristoph Hellwig #define xfs_buf_islocked(bp) \ 281c59d87c4SChristoph Hellwig ((bp)->b_sema.count <= 0) 282c59d87c4SChristoph Hellwig 283e8222613SDave Chinner static inline void xfs_buf_relse(struct xfs_buf *bp) 284f593bf14SDave Chinner { 285f593bf14SDave Chinner xfs_buf_unlock(bp); 286f593bf14SDave Chinner xfs_buf_rele(bp); 287f593bf14SDave Chinner } 288f593bf14SDave Chinner 289c59d87c4SChristoph Hellwig /* Buffer Read and Write Routines */ 290c2b006c1SChristoph Hellwig extern int xfs_bwrite(struct xfs_buf *bp); 291f593bf14SDave Chinner 29231ca03c9SDarrick J. Wong extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error, 29331ca03c9SDarrick J. Wong xfs_failaddr_t failaddr); 29431ca03c9SDarrick J. Wong #define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address) 295cdbcf82bSDarrick J. Wong extern void xfs_buf_ioerror_alert(struct xfs_buf *bp, xfs_failaddr_t fa); 29654b3b1f6SBrian Foster void xfs_buf_ioend_fail(struct xfs_buf *); 297f9a196eeSChristoph Hellwig void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize); 2988d57c216SDarrick J. Wong void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa); 2998d57c216SDarrick J. Wong #define xfs_buf_mark_corrupt(bp) __xfs_buf_mark_corrupt((bp), __this_address) 300c59d87c4SChristoph Hellwig 301c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 30288ee2df7SChristoph Hellwig extern void *xfs_buf_offset(struct xfs_buf *, size_t); 3035cfd28b6SDave Chinner extern void xfs_buf_stale(struct xfs_buf *bp); 304c59d87c4SChristoph Hellwig 305c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 30620e8a063SBrian Foster extern void xfs_buf_delwri_cancel(struct list_head *); 30743ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 30843ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 30943ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 3107912e7feSBrian Foster extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *); 311c59d87c4SChristoph Hellwig 31204fcad80SDave Chinner static inline xfs_daddr_t xfs_buf_daddr(struct xfs_buf *bp) 31304fcad80SDave Chinner { 31404fcad80SDave Chinner return bp->b_maps[0].bm_bn; 31504fcad80SDave Chinner } 31604fcad80SDave Chinner 3177561d27eSBrian Foster void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); 318c59d87c4SChristoph Hellwig 319879de98eSDave Chinner /* 320879de98eSDave Chinner * If the buffer is already on the LRU, do nothing. Otherwise set the buffer 321879de98eSDave Chinner * up with a reference count of 0 so it will be tossed from the cache when 322879de98eSDave Chinner * released. 323879de98eSDave Chinner */ 324879de98eSDave Chinner static inline void xfs_buf_oneshot(struct xfs_buf *bp) 325879de98eSDave Chinner { 326879de98eSDave Chinner if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1) 327879de98eSDave Chinner return; 328879de98eSDave Chinner atomic_set(&bp->b_lru_ref, 0); 329879de98eSDave Chinner } 330879de98eSDave Chinner 331c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 332c59d87c4SChristoph Hellwig { 333c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 334c59d87c4SChristoph Hellwig } 335c59d87c4SChristoph Hellwig 33651582170SEric Sandeen static inline int 33751582170SEric Sandeen xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 33851582170SEric Sandeen { 33951582170SEric Sandeen return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), 34051582170SEric Sandeen cksum_offset); 34151582170SEric Sandeen } 34251582170SEric Sandeen 343f1dbcd7eSEric Sandeen static inline void 344f1dbcd7eSEric Sandeen xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 345f1dbcd7eSEric Sandeen { 346f1dbcd7eSEric Sandeen xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), 347f1dbcd7eSEric Sandeen cksum_offset); 348f1dbcd7eSEric Sandeen } 349f1dbcd7eSEric Sandeen 350c59d87c4SChristoph Hellwig /* 351c59d87c4SChristoph Hellwig * Handling of buftargs. 352c59d87c4SChristoph Hellwig */ 3535b5abbefSChristoph Hellwig struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *mp, 3545b5abbefSChristoph Hellwig struct block_device *bdev); 355a1f69417SEric Sandeen extern void xfs_free_buftarg(struct xfs_buftarg *); 3568321ddb2SBrian Foster extern void xfs_buftarg_wait(struct xfs_buftarg *); 35710fb9ac1SBrian Foster extern void xfs_buftarg_drain(struct xfs_buftarg *); 35810fb9ac1SBrian Foster extern int xfs_setsize_buftarg(struct xfs_buftarg *, unsigned int); 359c59d87c4SChristoph Hellwig 360c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 361c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 362c59d87c4SChristoph Hellwig 36375d02303SBrian Foster int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops); 36415baadf7SDarrick J. Wong bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic); 36515baadf7SDarrick J. Wong bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic); 3661aff5696SDarrick J. Wong 367c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 368