Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #ifndef __XFS_BUF_H__ |
| 19 | #define __XFS_BUF_H__ |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/mm.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/buffer_head.h> |
| 27 | #include <linux/uio.h> |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 28 | #include <linux/list_lru.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | /* |
| 31 | * Base types |
| 32 | */ |
| 33 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 34 | #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 36 | typedef enum { |
| 37 | XBRW_READ = 1, /* transfer into target memory */ |
| 38 | XBRW_WRITE = 2, /* transfer from target memory */ |
| 39 | XBRW_ZERO = 3, /* Zero target memory */ |
| 40 | } xfs_buf_rw_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 42 | #define XBF_READ (1 << 0) /* buffer intended for reading from device */ |
| 43 | #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ |
| 44 | #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ |
| 45 | #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ |
| 46 | #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ |
| 47 | #define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */ |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame^] | 48 | #define XBF_WRITE_FAIL (1 << 24)/* async writes have failed on this buffer */ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 49 | |
| 50 | /* I/O hints for the BIO layer */ |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 51 | #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ |
| 52 | #define XBF_FUA (1 << 11)/* force cache write through mode */ |
| 53 | #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 55 | /* flags used only as arguments to access routines */ |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 56 | #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ |
| 57 | #define XBF_UNMAPPED (1 << 17)/* do not map the buffer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 59 | /* flags used only internally */ |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 60 | #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ |
| 61 | #define _XBF_KMEM (1 << 21)/* backed by heap memory */ |
| 62 | #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ |
| 63 | #define _XBF_COMPOUND (1 << 23)/* compound buffer */ |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 64 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 65 | typedef unsigned int xfs_buf_flags_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 67 | #define XFS_BUF_FLAGS \ |
| 68 | { XBF_READ, "READ" }, \ |
| 69 | { XBF_WRITE, "WRITE" }, \ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 70 | { XBF_READ_AHEAD, "READ_AHEAD" }, \ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 71 | { XBF_ASYNC, "ASYNC" }, \ |
| 72 | { XBF_DONE, "DONE" }, \ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 73 | { XBF_STALE, "STALE" }, \ |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame^] | 74 | { XBF_WRITE_FAIL, "WRITE_FAIL" }, \ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 75 | { XBF_SYNCIO, "SYNCIO" }, \ |
| 76 | { XBF_FUA, "FUA" }, \ |
| 77 | { XBF_FLUSH, "FLUSH" }, \ |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 78 | { XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\ |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 79 | { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 80 | { _XBF_PAGES, "PAGES" }, \ |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 81 | { _XBF_KMEM, "KMEM" }, \ |
Dave Chinner | cbb7baa | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 82 | { _XBF_DELWRI_Q, "DELWRI_Q" }, \ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 83 | { _XBF_COMPOUND, "COMPOUND" } |
| 84 | |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame^] | 85 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 86 | /* |
| 87 | * Internal state flags. |
| 88 | */ |
| 89 | #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | typedef struct xfs_buftarg { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 92 | dev_t bt_dev; |
| 93 | struct block_device *bt_bdev; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 94 | struct backing_dev_info *bt_bdi; |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 95 | struct xfs_mount *bt_mount; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 96 | unsigned int bt_bsize; |
| 97 | unsigned int bt_sshift; |
| 98 | size_t bt_smask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 100 | /* LRU control structures */ |
| 101 | struct shrinker bt_shrinker; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 102 | struct list_lru bt_lru; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } xfs_buftarg_t; |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | struct xfs_buf; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 106 | typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 108 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 109 | #define XB_PAGES 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Dave Chinner | cbb7baa | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 111 | struct xfs_buf_map { |
| 112 | xfs_daddr_t bm_bn; /* block number for I/O */ |
| 113 | int bm_len; /* size of I/O */ |
| 114 | }; |
| 115 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 116 | #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \ |
| 117 | struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) }; |
| 118 | |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 119 | struct xfs_buf_ops { |
| 120 | void (*verify_read)(struct xfs_buf *); |
| 121 | void (*verify_write)(struct xfs_buf *); |
| 122 | }; |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | typedef struct xfs_buf { |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 125 | /* |
| 126 | * first cacheline holds all the fields needed for an uncontended cache |
| 127 | * hit to be fully processed. The semaphore straddles the cacheline |
| 128 | * boundary, but the counter and lock sits on the first cacheline, |
| 129 | * which is the only bit that is touched if we hit the semaphore |
| 130 | * fast-path on locking. |
| 131 | */ |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 132 | struct rb_node b_rbnode; /* rbtree node */ |
Dave Chinner | cbb7baa | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 133 | xfs_daddr_t b_bn; /* block number of buffer */ |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 134 | int b_length; /* size of buffer in BBs */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 135 | atomic_t b_hold; /* reference count */ |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 136 | atomic_t b_lru_ref; /* lru reclaim ref count */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 137 | xfs_buf_flags_t b_flags; /* status flags */ |
| 138 | struct semaphore b_sema; /* semaphore for lockables */ |
| 139 | |
Carlos Maiolino | 6fb8a90 | 2012-08-10 15:01:51 -0300 | [diff] [blame] | 140 | /* |
| 141 | * concurrent access to b_lru and b_lru_flags are protected by |
| 142 | * bt_lru_lock and not by b_sema |
| 143 | */ |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 144 | struct list_head b_lru; /* lru list */ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 145 | spinlock_t b_lock; /* internal state lock */ |
| 146 | unsigned int b_state; /* internal state flags */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 147 | wait_queue_head_t b_waiters; /* unpin waiters */ |
| 148 | struct list_head b_list; |
| 149 | struct xfs_perag *b_pag; /* contains rbtree root */ |
| 150 | xfs_buftarg_t *b_target; /* buffer target (device) */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 151 | void *b_addr; /* virtual address of buffer */ |
| 152 | struct work_struct b_iodone_work; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 153 | xfs_buf_iodone_t b_iodone; /* I/O completion function */ |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 154 | struct completion b_iowait; /* queue for I/O waiters */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 155 | void *b_fspriv; |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 156 | struct xfs_trans *b_transp; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 157 | struct page **b_pages; /* array of page pointers */ |
| 158 | struct page *b_page_array[XB_PAGES]; /* inline pages */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 159 | struct xfs_buf_map *b_maps; /* compound buffer map */ |
Mark Tinguely | d44d9bc | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 160 | struct xfs_buf_map __b_map; /* inline compound buffer map */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 161 | int b_map_count; |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 162 | int b_io_length; /* IO size in BBs */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 163 | atomic_t b_pin_count; /* pin count */ |
| 164 | atomic_t b_io_remaining; /* #outstanding I/O requests */ |
| 165 | unsigned int b_page_count; /* size of page array */ |
| 166 | unsigned int b_offset; /* page offset in first page */ |
| 167 | unsigned short b_error; /* error code on I/O */ |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 168 | const struct xfs_buf_ops *b_ops; |
Dave Chinner | cfb0285 | 2012-11-12 22:54:19 +1100 | [diff] [blame] | 169 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 170 | #ifdef XFS_BUF_LOCK_TRACKING |
| 171 | int b_last_holder; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | #endif |
| 173 | } xfs_buf_t; |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | /* Finding and Reading Buffers */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 176 | struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, |
| 177 | struct xfs_buf_map *map, int nmaps, |
| 178 | xfs_buf_flags_t flags, struct xfs_buf *new_bp); |
| 179 | |
| 180 | static inline struct xfs_buf * |
| 181 | xfs_incore( |
| 182 | struct xfs_buftarg *target, |
| 183 | xfs_daddr_t blkno, |
| 184 | size_t numblks, |
| 185 | xfs_buf_flags_t flags) |
| 186 | { |
| 187 | DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
| 188 | return _xfs_buf_find(target, &map, 1, flags, NULL); |
| 189 | } |
| 190 | |
| 191 | struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, |
| 192 | struct xfs_buf_map *map, int nmaps, |
| 193 | xfs_buf_flags_t flags); |
| 194 | |
| 195 | static inline struct xfs_buf * |
| 196 | xfs_buf_alloc( |
| 197 | struct xfs_buftarg *target, |
| 198 | xfs_daddr_t blkno, |
| 199 | size_t numblks, |
| 200 | xfs_buf_flags_t flags) |
| 201 | { |
| 202 | DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
| 203 | return _xfs_buf_alloc(target, &map, 1, flags); |
| 204 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 206 | struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target, |
| 207 | struct xfs_buf_map *map, int nmaps, |
| 208 | xfs_buf_flags_t flags); |
| 209 | struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target, |
| 210 | struct xfs_buf_map *map, int nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 211 | xfs_buf_flags_t flags, |
| 212 | const struct xfs_buf_ops *ops); |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 213 | void xfs_buf_readahead_map(struct xfs_buftarg *target, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 214 | struct xfs_buf_map *map, int nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 215 | const struct xfs_buf_ops *ops); |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 216 | |
| 217 | static inline struct xfs_buf * |
| 218 | xfs_buf_get( |
| 219 | struct xfs_buftarg *target, |
| 220 | xfs_daddr_t blkno, |
| 221 | size_t numblks, |
| 222 | xfs_buf_flags_t flags) |
| 223 | { |
| 224 | DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
| 225 | return xfs_buf_get_map(target, &map, 1, flags); |
| 226 | } |
| 227 | |
| 228 | static inline struct xfs_buf * |
| 229 | xfs_buf_read( |
| 230 | struct xfs_buftarg *target, |
| 231 | xfs_daddr_t blkno, |
| 232 | size_t numblks, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 233 | xfs_buf_flags_t flags, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 234 | const struct xfs_buf_ops *ops) |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 235 | { |
| 236 | DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 237 | return xfs_buf_read_map(target, &map, 1, flags, ops); |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | static inline void |
| 241 | xfs_buf_readahead( |
| 242 | struct xfs_buftarg *target, |
| 243 | xfs_daddr_t blkno, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 244 | size_t numblks, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 245 | const struct xfs_buf_ops *ops) |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 246 | { |
| 247 | DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 248 | return xfs_buf_readahead_map(target, &map, 1, ops); |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 251 | struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks); |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 252 | void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks); |
| 253 | int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length); |
| 254 | |
| 255 | struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, |
| 256 | int flags); |
| 257 | struct xfs_buf *xfs_buf_read_uncached(struct xfs_buftarg *target, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 258 | xfs_daddr_t daddr, size_t numblks, int flags, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 259 | const struct xfs_buf_ops *ops); |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 260 | void xfs_buf_hold(struct xfs_buf *bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | /* Releasing Buffers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 263 | extern void xfs_buf_free(xfs_buf_t *); |
| 264 | extern void xfs_buf_rele(xfs_buf_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | /* Locking and Unlocking Buffers */ |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 267 | extern int xfs_buf_trylock(xfs_buf_t *); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 268 | extern void xfs_buf_lock(xfs_buf_t *); |
| 269 | extern void xfs_buf_unlock(xfs_buf_t *); |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 270 | #define xfs_buf_islocked(bp) \ |
| 271 | ((bp)->b_sema.count <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /* Buffer Read and Write Routines */ |
Christoph Hellwig | c2b006c | 2011-08-23 08:28:07 +0000 | [diff] [blame] | 274 | extern int xfs_bwrite(struct xfs_buf *bp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 275 | extern void xfs_buf_ioend(xfs_buf_t *, int); |
| 276 | extern void xfs_buf_ioerror(xfs_buf_t *, int); |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 277 | extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 278 | extern void xfs_buf_iorequest(xfs_buf_t *); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 279 | extern int xfs_buf_iowait(xfs_buf_t *); |
Dave Chinner | b9c4864 | 2010-01-20 10:47:39 +1100 | [diff] [blame] | 280 | extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 281 | xfs_buf_rw_t); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 282 | #define xfs_buf_zero(bp, off, len) \ |
| 283 | xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Christoph Hellwig | 83a0adc | 2013-12-17 00:03:52 -0800 | [diff] [blame] | 285 | extern int xfs_bioerror_relse(struct xfs_buf *); |
| 286 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 287 | static inline int xfs_buf_geterror(xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 289 | return bp ? bp->b_error : ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | /* Buffer Utility Routines */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 293 | extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | /* Delayed Write Buffer Routines */ |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 296 | extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *); |
| 297 | extern int xfs_buf_delwri_submit(struct list_head *); |
| 298 | extern int xfs_buf_delwri_submit_nowait(struct list_head *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | /* Buffer Daemon Setup Routines */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 301 | extern int xfs_buf_init(void); |
| 302 | extern void xfs_buf_terminate(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 304 | #define XFS_BUF_ZEROFLAGS(bp) \ |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 305 | ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC| \ |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame^] | 306 | XBF_SYNCIO|XBF_FUA|XBF_FLUSH| \ |
| 307 | XBF_WRITE_FAIL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 309 | void xfs_buf_stale(struct xfs_buf *bp); |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 310 | #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) |
| 311 | #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 313 | #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) |
| 314 | #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) |
| 315 | #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 317 | #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) |
| 318 | #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) |
| 319 | #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 321 | #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) |
| 322 | #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) |
| 323 | #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 325 | #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) |
| 326 | #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) |
| 327 | #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Dave Chinner | cbb7baa | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 329 | /* |
| 330 | * These macros use the IO block map rather than b_bn. b_bn is now really |
| 331 | * just for the buffer cache index for cached buffers. As IO does not use b_bn |
| 332 | * anymore, uncached buffers do not use b_bn at all and hence must modify the IO |
| 333 | * map directly. Uncached buffers are not allowed to be discontiguous, so this |
| 334 | * is safe to do. |
| 335 | * |
| 336 | * In future, uncached buffers will pass the block number directly to the io |
| 337 | * request function and hence these macros will go away at that point. |
| 338 | */ |
Mark Tinguely | d44d9bc | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 339 | #define XFS_BUF_ADDR(bp) ((bp)->b_maps[0].bm_bn) |
| 340 | #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Christoph Hellwig | 38f2323 | 2011-10-10 16:52:45 +0000 | [diff] [blame] | 342 | static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) |
Dave Chinner | 821eb21 | 2010-12-02 16:31:13 +1100 | [diff] [blame] | 343 | { |
| 344 | atomic_set(&bp->b_lru_ref, lru_ref); |
| 345 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
Chandra Seetharaman | 811e64c | 2011-07-22 23:40:27 +0000 | [diff] [blame] | 347 | static inline int xfs_buf_ispinned(struct xfs_buf *bp) |
| 348 | { |
| 349 | return atomic_read(&bp->b_pin_count); |
| 350 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 351 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 352 | static inline void xfs_buf_relse(xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
Christoph Hellwig | bfc6017 | 2011-01-07 13:02:23 +0000 | [diff] [blame] | 354 | xfs_buf_unlock(bp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 355 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | /* |
| 359 | * Handling of buftargs. |
| 360 | */ |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 361 | extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
| 362 | struct block_device *, int, const char *); |
Christoph Hellwig | c141b29 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 363 | extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | extern void xfs_wait_buftarg(xfs_buftarg_t *); |
| 365 | extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 366 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 367 | #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
| 368 | #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | #endif /* __XFS_BUF_H__ */ |