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 18c59d87c4SChristoph Hellwig /* 19c59d87c4SChristoph Hellwig * Base types 20c59d87c4SChristoph Hellwig */ 21c59d87c4SChristoph Hellwig 22c59d87c4SChristoph Hellwig #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) 23c59d87c4SChristoph Hellwig 24c59d87c4SChristoph Hellwig typedef enum { 25c59d87c4SChristoph Hellwig XBRW_READ = 1, /* transfer into target memory */ 26c59d87c4SChristoph Hellwig XBRW_WRITE = 2, /* transfer from target memory */ 27c59d87c4SChristoph Hellwig XBRW_ZERO = 3, /* Zero target memory */ 28c59d87c4SChristoph Hellwig } xfs_buf_rw_t; 29c59d87c4SChristoph Hellwig 30c59d87c4SChristoph Hellwig #define XBF_READ (1 << 0) /* buffer intended for reading from device */ 31c59d87c4SChristoph Hellwig #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ 32c59d87c4SChristoph Hellwig #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ 33c891c30aSBrian Foster #define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */ 34c59d87c4SChristoph Hellwig #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ 35c59d87c4SChristoph Hellwig #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ 3643ff2122SChristoph Hellwig #define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ 37ac8809f9SDave Chinner #define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */ 38c59d87c4SChristoph Hellwig 39c59d87c4SChristoph Hellwig /* I/O hints for the BIO layer */ 40c59d87c4SChristoph Hellwig #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ 41c59d87c4SChristoph Hellwig #define XBF_FUA (1 << 11)/* force cache write through mode */ 42c59d87c4SChristoph Hellwig #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ 43c59d87c4SChristoph Hellwig 44c59d87c4SChristoph Hellwig /* flags used only as arguments to access routines */ 45c59d87c4SChristoph Hellwig #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ 46611c9946SDave Chinner #define XBF_UNMAPPED (1 << 17)/* do not map the buffer */ 47c59d87c4SChristoph Hellwig 48c59d87c4SChristoph Hellwig /* flags used only internally */ 49c59d87c4SChristoph Hellwig #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ 50c59d87c4SChristoph Hellwig #define _XBF_KMEM (1 << 21)/* backed by heap memory */ 5143ff2122SChristoph Hellwig #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ 52cbb7baabSDave Chinner #define _XBF_COMPOUND (1 << 23)/* compound buffer */ 53c59d87c4SChristoph Hellwig 54c59d87c4SChristoph Hellwig typedef unsigned int xfs_buf_flags_t; 55c59d87c4SChristoph Hellwig 56c59d87c4SChristoph Hellwig #define XFS_BUF_FLAGS \ 57c59d87c4SChristoph Hellwig { XBF_READ, "READ" }, \ 58c59d87c4SChristoph Hellwig { XBF_WRITE, "WRITE" }, \ 59c59d87c4SChristoph Hellwig { XBF_READ_AHEAD, "READ_AHEAD" }, \ 601247ec4cSEric Sandeen { XBF_NO_IOACCT, "NO_IOACCT" }, \ 61c59d87c4SChristoph Hellwig { XBF_ASYNC, "ASYNC" }, \ 62c59d87c4SChristoph Hellwig { XBF_DONE, "DONE" }, \ 63c59d87c4SChristoph Hellwig { XBF_STALE, "STALE" }, \ 64ac8809f9SDave Chinner { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ 65c59d87c4SChristoph Hellwig { XBF_SYNCIO, "SYNCIO" }, \ 66c59d87c4SChristoph Hellwig { XBF_FUA, "FUA" }, \ 67c59d87c4SChristoph Hellwig { XBF_FLUSH, "FLUSH" }, \ 68a8acad70SDave Chinner { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\ 69611c9946SDave Chinner { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ 70c59d87c4SChristoph Hellwig { _XBF_PAGES, "PAGES" }, \ 71c59d87c4SChristoph Hellwig { _XBF_KMEM, "KMEM" }, \ 72cbb7baabSDave Chinner { _XBF_DELWRI_Q, "DELWRI_Q" }, \ 7363db7c81SBrian Foster { _XBF_COMPOUND, "COMPOUND" } 74a4082357SDave Chinner 75ac8809f9SDave Chinner 76a4082357SDave Chinner /* 77a4082357SDave Chinner * Internal state flags. 78a4082357SDave Chinner */ 79a4082357SDave Chinner #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ 8063db7c81SBrian Foster #define XFS_BSTATE_IN_FLIGHT (1 << 1) /* I/O in flight */ 81c59d87c4SChristoph Hellwig 827c71ee78SEric Sandeen /* 837c71ee78SEric Sandeen * The xfs_buftarg contains 2 notions of "sector size" - 847c71ee78SEric Sandeen * 857c71ee78SEric Sandeen * 1) The metadata sector size, which is the minimum unit and 867c71ee78SEric Sandeen * alignment of IO which will be performed by metadata operations. 877c71ee78SEric Sandeen * 2) The device logical sector size 887c71ee78SEric Sandeen * 897c71ee78SEric Sandeen * The first is specified at mkfs time, and is stored on-disk in the 907c71ee78SEric Sandeen * superblock's sb_sectsize. 917c71ee78SEric Sandeen * 927c71ee78SEric Sandeen * The latter is derived from the underlying device, and controls direct IO 937c71ee78SEric Sandeen * alignment constraints. 947c71ee78SEric Sandeen */ 95c59d87c4SChristoph Hellwig typedef struct xfs_buftarg { 96c59d87c4SChristoph Hellwig dev_t bt_dev; 97c59d87c4SChristoph Hellwig struct block_device *bt_bdev; 98486aff5eSDan Williams struct dax_device *bt_daxdev; 99c59d87c4SChristoph Hellwig struct xfs_mount *bt_mount; 1006da54179SEric Sandeen unsigned int bt_meta_sectorsize; 1016da54179SEric Sandeen size_t bt_meta_sectormask; 1027c71ee78SEric Sandeen size_t bt_logical_sectorsize; 1037c71ee78SEric Sandeen size_t bt_logical_sectormask; 104c59d87c4SChristoph Hellwig 105c59d87c4SChristoph Hellwig /* LRU control structures */ 106c59d87c4SChristoph Hellwig struct shrinker bt_shrinker; 107e80dfa19SDave Chinner struct list_lru bt_lru; 1089c7504aaSBrian Foster 1099c7504aaSBrian Foster struct percpu_counter bt_io_count; 110c59d87c4SChristoph Hellwig } xfs_buftarg_t; 111c59d87c4SChristoph Hellwig 112c59d87c4SChristoph Hellwig struct xfs_buf; 113c59d87c4SChristoph Hellwig typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); 114c59d87c4SChristoph Hellwig 115c3f8fc73SDave Chinner 116c59d87c4SChristoph Hellwig #define XB_PAGES 2 117c59d87c4SChristoph Hellwig 118cbb7baabSDave Chinner struct xfs_buf_map { 119cbb7baabSDave Chinner xfs_daddr_t bm_bn; /* block number for I/O */ 120cbb7baabSDave Chinner int bm_len; /* size of I/O */ 121cbb7baabSDave Chinner }; 122cbb7baabSDave Chinner 1233e85c868SDave Chinner #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ 1243e85c868SDave Chinner struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; 1253e85c868SDave Chinner 1261813dd64SDave Chinner struct xfs_buf_ops { 127233135b7SEric Sandeen char *name; 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 133c59d87c4SChristoph Hellwig typedef 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 */ 142cbb7baabSDave Chinner xfs_daddr_t b_bn; /* block number of buffer */ 1434e94b71bSDave Chinner int b_length; /* size of buffer in BBs */ 144c59d87c4SChristoph Hellwig atomic_t b_hold; /* reference count */ 145c59d87c4SChristoph Hellwig atomic_t b_lru_ref; /* lru reclaim ref count */ 146c59d87c4SChristoph Hellwig xfs_buf_flags_t b_flags; /* status flags */ 147c59d87c4SChristoph Hellwig struct semaphore b_sema; /* semaphore for lockables */ 148c59d87c4SChristoph Hellwig 1496fb8a90aSCarlos Maiolino /* 1506fb8a90aSCarlos Maiolino * concurrent access to b_lru and b_lru_flags are protected by 1516fb8a90aSCarlos Maiolino * bt_lru_lock and not by b_sema 1526fb8a90aSCarlos Maiolino */ 153c59d87c4SChristoph Hellwig struct list_head b_lru; /* lru list */ 154a4082357SDave Chinner spinlock_t b_lock; /* internal state lock */ 155a4082357SDave Chinner unsigned int b_state; /* internal state flags */ 15661be9c52SDave Chinner int b_io_error; /* internal IO error state */ 157c59d87c4SChristoph Hellwig wait_queue_head_t b_waiters; /* unpin waiters */ 158c59d87c4SChristoph Hellwig struct list_head b_list; 159c59d87c4SChristoph Hellwig struct xfs_perag *b_pag; /* contains rbtree root */ 160c59d87c4SChristoph Hellwig xfs_buftarg_t *b_target; /* buffer target (device) */ 161c59d87c4SChristoph Hellwig void *b_addr; /* virtual address of buffer */ 162b29c70f5SBrian Foster struct work_struct b_ioend_work; 163b29c70f5SBrian Foster struct workqueue_struct *b_ioend_wq; /* I/O completion wq */ 164c59d87c4SChristoph Hellwig xfs_buf_iodone_t b_iodone; /* I/O completion function */ 165c59d87c4SChristoph Hellwig struct completion b_iowait; /* queue for I/O waiters */ 166fb1755a6SCarlos Maiolino void *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; 174aa0e8833SDave Chinner int b_io_length; /* IO size in BBs */ 175c59d87c4SChristoph Hellwig atomic_t b_pin_count; /* pin count */ 176c59d87c4SChristoph Hellwig atomic_t b_io_remaining; /* #outstanding I/O requests */ 177c59d87c4SChristoph Hellwig unsigned int b_page_count; /* size of page array */ 178c59d87c4SChristoph Hellwig unsigned int b_offset; /* page offset in first page */ 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; 201c59d87c4SChristoph Hellwig } xfs_buf_t; 202c59d87c4SChristoph Hellwig 203c59d87c4SChristoph Hellwig /* Finding and Reading Buffers */ 2048925a3dcSDave Chinner struct xfs_buf *xfs_buf_incore(struct xfs_buftarg *target, 2058925a3dcSDave Chinner xfs_daddr_t blkno, size_t numblks, 2068925a3dcSDave Chinner xfs_buf_flags_t flags); 2073e85c868SDave Chinner 2083e85c868SDave Chinner struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, 2093e85c868SDave Chinner struct xfs_buf_map *map, int nmaps, 2103e85c868SDave Chinner xfs_buf_flags_t flags); 2113e85c868SDave Chinner 2123e85c868SDave Chinner static inline struct xfs_buf * 2133e85c868SDave Chinner xfs_buf_alloc( 2143e85c868SDave Chinner struct xfs_buftarg *target, 2153e85c868SDave Chinner xfs_daddr_t blkno, 2163e85c868SDave Chinner size_t numblks, 2173e85c868SDave Chinner xfs_buf_flags_t flags) 2183e85c868SDave Chinner { 2193e85c868SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2203e85c868SDave Chinner return _xfs_buf_alloc(target, &map, 1, flags); 2213e85c868SDave Chinner } 222c59d87c4SChristoph Hellwig 2236dde2707SDave Chinner struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, 2246dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2256dde2707SDave Chinner xfs_buf_flags_t flags); 2266dde2707SDave Chinner struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, 2276dde2707SDave Chinner struct xfs_buf_map *map, int nmaps, 2281813dd64SDave Chinner xfs_buf_flags_t flags, 2291813dd64SDave Chinner const struct xfs_buf_ops *ops); 2306dde2707SDave Chinner void xfs_buf_readahead_map(struct xfs_buftarg *target, 231c3f8fc73SDave Chinner struct xfs_buf_map *map, int nmaps, 2321813dd64SDave Chinner const struct xfs_buf_ops *ops); 2336dde2707SDave Chinner 2346dde2707SDave Chinner static inline struct xfs_buf * 2356dde2707SDave Chinner xfs_buf_get( 2366dde2707SDave Chinner struct xfs_buftarg *target, 2376dde2707SDave Chinner xfs_daddr_t blkno, 2386dde2707SDave Chinner size_t numblks, 2396dde2707SDave Chinner xfs_buf_flags_t flags) 2406dde2707SDave Chinner { 2416dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2426dde2707SDave Chinner return xfs_buf_get_map(target, &map, 1, flags); 2436dde2707SDave Chinner } 2446dde2707SDave Chinner 2456dde2707SDave Chinner static inline struct xfs_buf * 2466dde2707SDave Chinner xfs_buf_read( 2476dde2707SDave Chinner struct xfs_buftarg *target, 2486dde2707SDave Chinner xfs_daddr_t blkno, 2496dde2707SDave Chinner size_t numblks, 250c3f8fc73SDave Chinner xfs_buf_flags_t flags, 2511813dd64SDave Chinner const struct xfs_buf_ops *ops) 2526dde2707SDave Chinner { 2536dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2541813dd64SDave Chinner return xfs_buf_read_map(target, &map, 1, flags, ops); 2556dde2707SDave Chinner } 2566dde2707SDave Chinner 2576dde2707SDave Chinner static inline void 2586dde2707SDave Chinner xfs_buf_readahead( 2596dde2707SDave Chinner struct xfs_buftarg *target, 2606dde2707SDave Chinner xfs_daddr_t blkno, 261c3f8fc73SDave Chinner size_t numblks, 2621813dd64SDave Chinner const struct xfs_buf_ops *ops) 2636dde2707SDave Chinner { 2646dde2707SDave Chinner DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); 2651813dd64SDave Chinner return xfs_buf_readahead_map(target, &map, 1, ops); 2666dde2707SDave Chinner } 267c59d87c4SChristoph Hellwig 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); 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) 295901796afSChristoph Hellwig extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); 2966af88cdaSBrian Foster 2976af88cdaSBrian Foster extern int __xfs_buf_submit(struct xfs_buf *bp, bool); 2986af88cdaSBrian Foster static inline int xfs_buf_submit(struct xfs_buf *bp) 2996af88cdaSBrian Foster { 3006af88cdaSBrian Foster bool wait = bp->b_flags & XBF_ASYNC ? false : true; 3016af88cdaSBrian Foster return __xfs_buf_submit(bp, wait); 3026af88cdaSBrian Foster } 3036af88cdaSBrian Foster 304c59d87c4SChristoph Hellwig extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, 305c59d87c4SChristoph Hellwig xfs_buf_rw_t); 306c59d87c4SChristoph Hellwig #define xfs_buf_zero(bp, off, len) \ 307c59d87c4SChristoph Hellwig xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) 308c59d87c4SChristoph Hellwig 309c59d87c4SChristoph Hellwig /* Buffer Utility Routines */ 31088ee2df7SChristoph Hellwig extern void *xfs_buf_offset(struct xfs_buf *, size_t); 3115cfd28b6SDave Chinner extern void xfs_buf_stale(struct xfs_buf *bp); 312c59d87c4SChristoph Hellwig 313c59d87c4SChristoph Hellwig /* Delayed Write Buffer Routines */ 31420e8a063SBrian Foster extern void xfs_buf_delwri_cancel(struct list_head *); 31543ff2122SChristoph Hellwig extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); 31643ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit(struct list_head *); 31743ff2122SChristoph Hellwig extern int xfs_buf_delwri_submit_nowait(struct list_head *); 3187912e7feSBrian Foster extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *); 319c59d87c4SChristoph Hellwig 320c59d87c4SChristoph Hellwig /* Buffer Daemon Setup Routines */ 321c59d87c4SChristoph Hellwig extern int xfs_buf_init(void); 322c59d87c4SChristoph Hellwig extern void xfs_buf_terminate(void); 323c59d87c4SChristoph Hellwig 324cbb7baabSDave Chinner /* 325cbb7baabSDave Chinner * These macros use the IO block map rather than b_bn. b_bn is now really 326cbb7baabSDave Chinner * just for the buffer cache index for cached buffers. As IO does not use b_bn 327cbb7baabSDave Chinner * anymore, uncached buffers do not use b_bn at all and hence must modify the IO 328cbb7baabSDave Chinner * map directly. Uncached buffers are not allowed to be discontiguous, so this 329cbb7baabSDave Chinner * is safe to do. 330cbb7baabSDave Chinner * 331cbb7baabSDave Chinner * In future, uncached buffers will pass the block number directly to the io 332cbb7baabSDave Chinner * request function and hence these macros will go away at that point. 333cbb7baabSDave Chinner */ 334d44d9bc6SMark Tinguely #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) 335d44d9bc6SMark Tinguely #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) 336c59d87c4SChristoph Hellwig 3377561d27eSBrian Foster void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); 338c59d87c4SChristoph Hellwig 339879de98eSDave Chinner /* 340879de98eSDave Chinner * If the buffer is already on the LRU, do nothing. Otherwise set the buffer 341879de98eSDave Chinner * up with a reference count of 0 so it will be tossed from the cache when 342879de98eSDave Chinner * released. 343879de98eSDave Chinner */ 344879de98eSDave Chinner static inline void xfs_buf_oneshot(struct xfs_buf *bp) 345879de98eSDave Chinner { 346879de98eSDave Chinner if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1) 347879de98eSDave Chinner return; 348879de98eSDave Chinner atomic_set(&bp->b_lru_ref, 0); 349879de98eSDave Chinner } 350879de98eSDave Chinner 351c59d87c4SChristoph Hellwig static inline int xfs_buf_ispinned(struct xfs_buf *bp) 352c59d87c4SChristoph Hellwig { 353c59d87c4SChristoph Hellwig return atomic_read(&bp->b_pin_count); 354c59d87c4SChristoph Hellwig } 355c59d87c4SChristoph Hellwig 356c59d87c4SChristoph Hellwig static inline void xfs_buf_relse(xfs_buf_t *bp) 357c59d87c4SChristoph Hellwig { 358c59d87c4SChristoph Hellwig xfs_buf_unlock(bp); 359c59d87c4SChristoph Hellwig xfs_buf_rele(bp); 360c59d87c4SChristoph Hellwig } 361c59d87c4SChristoph Hellwig 36251582170SEric Sandeen static inline int 36351582170SEric Sandeen xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 36451582170SEric Sandeen { 36551582170SEric Sandeen return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length), 36651582170SEric Sandeen cksum_offset); 36751582170SEric Sandeen } 36851582170SEric Sandeen 369f1dbcd7eSEric Sandeen static inline void 370f1dbcd7eSEric Sandeen xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset) 371f1dbcd7eSEric Sandeen { 372f1dbcd7eSEric Sandeen xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), 373f1dbcd7eSEric Sandeen cksum_offset); 374f1dbcd7eSEric Sandeen } 375f1dbcd7eSEric Sandeen 376c59d87c4SChristoph Hellwig /* 377c59d87c4SChristoph Hellwig * Handling of buftargs. 378c59d87c4SChristoph Hellwig */ 379c59d87c4SChristoph Hellwig extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, 380486aff5eSDan Williams struct block_device *, struct dax_device *); 381a1f69417SEric Sandeen extern void xfs_free_buftarg(struct xfs_buftarg *); 382c59d87c4SChristoph Hellwig extern void xfs_wait_buftarg(xfs_buftarg_t *); 383a96c4151SEric Sandeen extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int); 384c59d87c4SChristoph Hellwig 385c59d87c4SChristoph Hellwig #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) 386c59d87c4SChristoph Hellwig #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) 387c59d87c4SChristoph Hellwig 38875d02303SBrian Foster int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops); 3891aff5696SDarrick J. Wong 390c59d87c4SChristoph Hellwig #endif /* __XFS_BUF_H__ */ 391