Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 | */ |
Vlad Apostolov | 93c189c | 2006-11-11 18:03:49 +1100 | [diff] [blame] | 18 | #include "xfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/stddef.h> |
| 20 | #include <linux/errno.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/vmalloc.h> |
| 25 | #include <linux/bio.h> |
| 26 | #include <linux/sysctl.h> |
| 27 | #include <linux/proc_fs.h> |
| 28 | #include <linux/workqueue.h> |
| 29 | #include <linux/percpu.h> |
| 30 | #include <linux/blkdev.h> |
| 31 | #include <linux/hash.h> |
Christoph Hellwig | 4df08c5 | 2005-09-05 08:34:18 +1000 | [diff] [blame] | 32 | #include <linux/kthread.h> |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 33 | #include <linux/migrate.h> |
Andrew Morton | 3fcfab1 | 2006-10-19 23:28:16 -0700 | [diff] [blame] | 34 | #include <linux/backing-dev.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 35 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Christoph Hellwig | 4fb6e8a | 2014-11-28 14:25:04 +1100 | [diff] [blame] | 37 | #include "xfs_format.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 38 | #include "xfs_log_format.h" |
Dave Chinner | 7fd36c4 | 2013-08-12 20:49:32 +1000 | [diff] [blame] | 39 | #include "xfs_trans_resv.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 40 | #include "xfs_sb.h" |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 41 | #include "xfs_mount.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 42 | #include "xfs_trace.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 43 | #include "xfs_log.h" |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 44 | |
David Chinner | 7989cb8 | 2007-02-10 18:34:56 +1100 | [diff] [blame] | 45 | static kmem_zone_t *xfs_buf_zone; |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 46 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 47 | #ifdef XFS_BUF_LOCK_TRACKING |
| 48 | # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid) |
| 49 | # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1) |
| 50 | # define XB_GET_OWNER(bp) ((bp)->b_last_holder) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #else |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 52 | # define XB_SET_OWNER(bp) do { } while (0) |
| 53 | # define XB_CLEAR_OWNER(bp) do { } while (0) |
| 54 | # define XB_GET_OWNER(bp) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #endif |
| 56 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 57 | #define xb_to_gfp(flags) \ |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 58 | ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : GFP_NOFS) | __GFP_NOWARN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 61 | static inline int |
| 62 | xfs_buf_is_vmapped( |
| 63 | struct xfs_buf *bp) |
| 64 | { |
| 65 | /* |
| 66 | * Return true if the buffer is vmapped. |
| 67 | * |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 68 | * b_addr is null if the buffer is not mapped, but the code is clever |
| 69 | * enough to know it doesn't have to map a single page, so the check has |
| 70 | * to be both for b_addr and bp->b_page_count > 1. |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 71 | */ |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 72 | return bp->b_addr && bp->b_page_count > 1; |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static inline int |
| 76 | xfs_buf_vmap_len( |
| 77 | struct xfs_buf *bp) |
| 78 | { |
| 79 | return (bp->b_page_count * PAGE_SIZE) - bp->b_offset; |
| 80 | } |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 83 | * When we mark a buffer stale, we remove the buffer from the LRU and clear the |
| 84 | * b_lru_ref count so that the buffer is freed immediately when the buffer |
| 85 | * reference count falls to zero. If the buffer is already on the LRU, we need |
| 86 | * to remove the reference that LRU holds on the buffer. |
| 87 | * |
| 88 | * This prevents build-up of stale buffers on the LRU. |
| 89 | */ |
| 90 | void |
| 91 | xfs_buf_stale( |
| 92 | struct xfs_buf *bp) |
| 93 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 94 | ASSERT(xfs_buf_islocked(bp)); |
| 95 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 96 | bp->b_flags |= XBF_STALE; |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 97 | |
| 98 | /* |
| 99 | * Clear the delwri status so that a delwri queue walker will not |
| 100 | * flush this buffer to disk now that it is stale. The delwri queue has |
| 101 | * a reference to the buffer, so this is safe to do. |
| 102 | */ |
| 103 | bp->b_flags &= ~_XBF_DELWRI_Q; |
| 104 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 105 | spin_lock(&bp->b_lock); |
| 106 | atomic_set(&bp->b_lru_ref, 0); |
| 107 | if (!(bp->b_state & XFS_BSTATE_DISPOSE) && |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 108 | (list_lru_del(&bp->b_target->bt_lru, &bp->b_lru))) |
| 109 | atomic_dec(&bp->b_hold); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 110 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 111 | ASSERT(atomic_read(&bp->b_hold) >= 1); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 112 | spin_unlock(&bp->b_lock); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 115 | static int |
| 116 | xfs_buf_get_maps( |
| 117 | struct xfs_buf *bp, |
| 118 | int map_count) |
| 119 | { |
| 120 | ASSERT(bp->b_maps == NULL); |
| 121 | bp->b_map_count = map_count; |
| 122 | |
| 123 | if (map_count == 1) { |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 124 | bp->b_maps = &bp->__b_map; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | bp->b_maps = kmem_zalloc(map_count * sizeof(struct xfs_buf_map), |
| 129 | KM_NOFS); |
| 130 | if (!bp->b_maps) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 131 | return -ENOMEM; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Frees b_pages if it was allocated. |
| 137 | */ |
| 138 | static void |
| 139 | xfs_buf_free_maps( |
| 140 | struct xfs_buf *bp) |
| 141 | { |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 142 | if (bp->b_maps != &bp->__b_map) { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 143 | kmem_free(bp->b_maps); |
| 144 | bp->b_maps = NULL; |
| 145 | } |
| 146 | } |
| 147 | |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 148 | struct xfs_buf * |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 149 | _xfs_buf_alloc( |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 150 | struct xfs_buftarg *target, |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 151 | struct xfs_buf_map *map, |
| 152 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 153 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 155 | struct xfs_buf *bp; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 156 | int error; |
| 157 | int i; |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 158 | |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 159 | bp = kmem_zone_zalloc(xfs_buf_zone, KM_NOFS); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 160 | if (unlikely(!bp)) |
| 161 | return NULL; |
| 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | /* |
Dave Chinner | 12bcb3f | 2012-04-23 15:59:05 +1000 | [diff] [blame] | 164 | * We don't want certain flags to appear in b_flags unless they are |
| 165 | * specifically set by later operations on the buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | */ |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 167 | flags &= ~(XBF_UNMAPPED | XBF_TRYLOCK | XBF_ASYNC | XBF_READ_AHEAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 169 | atomic_set(&bp->b_hold, 1); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 170 | atomic_set(&bp->b_lru_ref, 1); |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 171 | init_completion(&bp->b_iowait); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 172 | INIT_LIST_HEAD(&bp->b_lru); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 173 | INIT_LIST_HEAD(&bp->b_list); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 174 | RB_CLEAR_NODE(&bp->b_rbnode); |
Thomas Gleixner | a731cd1 | 2010-09-07 14:33:15 +0000 | [diff] [blame] | 175 | sema_init(&bp->b_sema, 0); /* held, no waiters */ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 176 | spin_lock_init(&bp->b_lock); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 177 | XB_SET_OWNER(bp); |
| 178 | bp->b_target = target; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 179 | bp->b_flags = flags; |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | /* |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 182 | * Set length and io_length to the same value initially. |
| 183 | * I/O routines should use io_length, which will be the same in |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | * most cases but may be reset (e.g. XFS recovery). |
| 185 | */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 186 | error = xfs_buf_get_maps(bp, nmaps); |
| 187 | if (error) { |
| 188 | kmem_zone_free(xfs_buf_zone, bp); |
| 189 | return NULL; |
| 190 | } |
| 191 | |
| 192 | bp->b_bn = map[0].bm_bn; |
| 193 | bp->b_length = 0; |
| 194 | for (i = 0; i < nmaps; i++) { |
| 195 | bp->b_maps[i].bm_bn = map[i].bm_bn; |
| 196 | bp->b_maps[i].bm_len = map[i].bm_len; |
| 197 | bp->b_length += map[i].bm_len; |
| 198 | } |
| 199 | bp->b_io_length = bp->b_length; |
| 200 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 201 | atomic_set(&bp->b_pin_count, 0); |
| 202 | init_waitqueue_head(&bp->b_waiters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 204 | XFS_STATS_INC(xb_create); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 205 | trace_xfs_buf_init(bp, _RET_IP_); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 206 | |
| 207 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 211 | * Allocate a page array capable of holding a specified number |
| 212 | * of pages, and point the page buf at it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | */ |
| 214 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 215 | _xfs_buf_get_pages( |
| 216 | xfs_buf_t *bp, |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 217 | int page_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | { |
| 219 | /* Make sure that we have a page list */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 220 | if (bp->b_pages == NULL) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 221 | bp->b_page_count = page_count; |
| 222 | if (page_count <= XB_PAGES) { |
| 223 | bp->b_pages = bp->b_page_array; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 225 | bp->b_pages = kmem_alloc(sizeof(struct page *) * |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 226 | page_count, KM_NOFS); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 227 | if (bp->b_pages == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return -ENOMEM; |
| 229 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 230 | memset(bp->b_pages, 0, sizeof(struct page *) * page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 236 | * Frees b_pages if it was allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | */ |
| 238 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 239 | _xfs_buf_free_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | xfs_buf_t *bp) |
| 241 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 242 | if (bp->b_pages != bp->b_page_array) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 243 | kmem_free(bp->b_pages); |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 244 | bp->b_pages = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Releases the specified buffer. |
| 250 | * |
| 251 | * The modification state of any associated pages is left unchanged. |
Zhi Yong Wu | b46fe82 | 2013-08-07 10:10:59 +0000 | [diff] [blame] | 252 | * The buffer must not be on any hash - use xfs_buf_rele instead for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | * hashed and refcounted buffers |
| 254 | */ |
| 255 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 256 | xfs_buf_free( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | xfs_buf_t *bp) |
| 258 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 259 | trace_xfs_buf_free(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 261 | ASSERT(list_empty(&bp->b_lru)); |
| 262 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 263 | if (bp->b_flags & _XBF_PAGES) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | uint i; |
| 265 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 266 | if (xfs_buf_is_vmapped(bp)) |
Alex Elder | 8a262e5 | 2010-03-16 18:55:56 +0000 | [diff] [blame] | 267 | vm_unmap_ram(bp->b_addr - bp->b_offset, |
| 268 | bp->b_page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 270 | for (i = 0; i < bp->b_page_count; i++) { |
| 271 | struct page *page = bp->b_pages[i]; |
| 272 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 273 | __free_page(page); |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 274 | } |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 275 | } else if (bp->b_flags & _XBF_KMEM) |
| 276 | kmem_free(bp->b_addr); |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 277 | _xfs_buf_free_pages(bp); |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 278 | xfs_buf_free_maps(bp); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 279 | kmem_zone_free(xfs_buf_zone, bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 283 | * Allocates all the pages for buffer in question and builds it's page list. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | */ |
| 285 | STATIC int |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 286 | xfs_buf_allocate_memory( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | xfs_buf_t *bp, |
| 288 | uint flags) |
| 289 | { |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 290 | size_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | size_t nbytes, offset; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 292 | gfp_t gfp_mask = xb_to_gfp(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | unsigned short page_count, i; |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 294 | xfs_off_t start, end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | int error; |
| 296 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 297 | /* |
| 298 | * for buffers that are contained within a single page, just allocate |
| 299 | * the memory from the heap - there's no need for the complexity of |
| 300 | * page arrays to keep allocation down to order 0. |
| 301 | */ |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 302 | size = BBTOB(bp->b_length); |
| 303 | if (size < PAGE_SIZE) { |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 304 | bp->b_addr = kmem_alloc(size, KM_NOFS); |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 305 | if (!bp->b_addr) { |
| 306 | /* low memory - use alloc_page loop instead */ |
| 307 | goto use_alloc_page; |
| 308 | } |
| 309 | |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 310 | if (((unsigned long)(bp->b_addr + size - 1) & PAGE_MASK) != |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 311 | ((unsigned long)bp->b_addr & PAGE_MASK)) { |
| 312 | /* b_addr spans two pages - use alloc_page instead */ |
| 313 | kmem_free(bp->b_addr); |
| 314 | bp->b_addr = NULL; |
| 315 | goto use_alloc_page; |
| 316 | } |
| 317 | bp->b_offset = offset_in_page(bp->b_addr); |
| 318 | bp->b_pages = bp->b_page_array; |
| 319 | bp->b_pages[0] = virt_to_page(bp->b_addr); |
| 320 | bp->b_page_count = 1; |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 321 | bp->b_flags |= _XBF_KMEM; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | use_alloc_page: |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 326 | start = BBTOB(bp->b_maps[0].bm_bn) >> PAGE_SHIFT; |
| 327 | end = (BBTOB(bp->b_maps[0].bm_bn + bp->b_length) + PAGE_SIZE - 1) |
Dave Chinner | cbb7baab | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 328 | >> PAGE_SHIFT; |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 329 | page_count = end - start; |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 330 | error = _xfs_buf_get_pages(bp, page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | if (unlikely(error)) |
| 332 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 334 | offset = bp->b_offset; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 335 | bp->b_flags |= _XBF_PAGES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 337 | for (i = 0; i < bp->b_page_count; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | struct page *page; |
| 339 | uint retries = 0; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 340 | retry: |
| 341 | page = alloc_page(gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (unlikely(page == NULL)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 343 | if (flags & XBF_READ_AHEAD) { |
| 344 | bp->b_page_count = i; |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 345 | error = -ENOMEM; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 346 | goto out_free_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | /* |
| 350 | * This could deadlock. |
| 351 | * |
| 352 | * But until all the XFS lowlevel code is revamped to |
| 353 | * handle buffer allocation failures we can't do much. |
| 354 | */ |
| 355 | if (!(++retries % 100)) |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 356 | xfs_err(NULL, |
| 357 | "possible memory allocation deadlock in %s (mode:0x%x)", |
Harvey Harrison | 34a622b | 2008-04-10 12:19:21 +1000 | [diff] [blame] | 358 | __func__, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 360 | XFS_STATS_INC(xb_page_retries); |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 361 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | goto retry; |
| 363 | } |
| 364 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 365 | XFS_STATS_INC(xb_page_found); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 367 | nbytes = min_t(size_t, size, PAGE_SIZE - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | size -= nbytes; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 369 | bp->b_pages[i] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | offset = 0; |
| 371 | } |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 372 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 374 | out_free_pages: |
| 375 | for (i = 0; i < bp->b_page_count; i++) |
| 376 | __free_page(bp->b_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | return error; |
| 378 | } |
| 379 | |
| 380 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 381 | * Map buffer into kernel address-space if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | */ |
| 383 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 384 | _xfs_buf_map_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | xfs_buf_t *bp, |
| 386 | uint flags) |
| 387 | { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 388 | ASSERT(bp->b_flags & _XBF_PAGES); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 389 | if (bp->b_page_count == 1) { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 390 | /* A single page buffer is always mappable */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 391 | bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 392 | } else if (flags & XBF_UNMAPPED) { |
| 393 | bp->b_addr = NULL; |
| 394 | } else { |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 395 | int retried = 0; |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 396 | unsigned noio_flag; |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 397 | |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 398 | /* |
| 399 | * vm_map_ram() will allocate auxillary structures (e.g. |
| 400 | * pagetables) with GFP_KERNEL, yet we are likely to be under |
| 401 | * GFP_NOFS context here. Hence we need to tell memory reclaim |
| 402 | * that we are in such a context via PF_MEMALLOC_NOIO to prevent |
| 403 | * memory reclaim re-entering the filesystem here and |
| 404 | * potentially deadlocking. |
| 405 | */ |
| 406 | noio_flag = memalloc_noio_save(); |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 407 | do { |
| 408 | bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, |
| 409 | -1, PAGE_KERNEL); |
| 410 | if (bp->b_addr) |
| 411 | break; |
| 412 | vm_unmap_aliases(); |
| 413 | } while (retried++ <= 1); |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 414 | memalloc_noio_restore(noio_flag); |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 415 | |
| 416 | if (!bp->b_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | return -ENOMEM; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 418 | bp->b_addr += bp->b_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * Finding and Reading Buffers |
| 426 | */ |
| 427 | |
| 428 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 429 | * Look up, and creates if absent, a lockable buffer for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | * a given range of an inode. The buffer is returned |
Chandra Seetharaman | eabbaf1 | 2011-09-08 20:18:50 +0000 | [diff] [blame] | 431 | * locked. No I/O is implied by this call. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | */ |
| 433 | xfs_buf_t * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 434 | _xfs_buf_find( |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 435 | struct xfs_buftarg *btp, |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 436 | struct xfs_buf_map *map, |
| 437 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 438 | xfs_buf_flags_t flags, |
| 439 | xfs_buf_t *new_bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 441 | size_t numbytes; |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 442 | struct xfs_perag *pag; |
| 443 | struct rb_node **rbp; |
| 444 | struct rb_node *parent; |
| 445 | xfs_buf_t *bp; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 446 | xfs_daddr_t blkno = map[0].bm_bn; |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 447 | xfs_daddr_t eofs; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 448 | int numblks = 0; |
| 449 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 451 | for (i = 0; i < nmaps; i++) |
| 452 | numblks += map[i].bm_len; |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 453 | numbytes = BBTOB(numblks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | /* Check for IOs smaller than the sector size / not sector aligned */ |
Eric Sandeen | 6da5417 | 2014-01-21 16:45:52 -0600 | [diff] [blame] | 456 | ASSERT(!(numbytes < btp->bt_meta_sectorsize)); |
| 457 | ASSERT(!(BBTOB(blkno) & (xfs_off_t)btp->bt_meta_sectormask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 459 | /* |
| 460 | * Corrupted block numbers can get through to here, unfortunately, so we |
| 461 | * have to check that the buffer falls within the filesystem bounds. |
| 462 | */ |
| 463 | eofs = XFS_FSB_TO_BB(btp->bt_mount, btp->bt_mount->m_sb.sb_dblocks); |
Eric Sandeen | db52d09 | 2014-11-28 14:03:55 +1100 | [diff] [blame] | 464 | if (blkno < 0 || blkno >= eofs) { |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 465 | /* |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 466 | * XXX (dgc): we should really be returning -EFSCORRUPTED here, |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 467 | * but none of the higher level infrastructure supports |
| 468 | * returning a specific error on buffer lookup failures. |
| 469 | */ |
| 470 | xfs_alert(btp->bt_mount, |
| 471 | "%s: Block out of range: block 0x%llx, EOFS 0x%llx ", |
| 472 | __func__, blkno, eofs); |
Dave Chinner | 7bc0dc2 | 2013-05-21 18:02:08 +1000 | [diff] [blame] | 473 | WARN_ON(1); |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 474 | return NULL; |
| 475 | } |
| 476 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 477 | /* get tree root */ |
| 478 | pag = xfs_perag_get(btp->bt_mount, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 479 | xfs_daddr_to_agno(btp->bt_mount, blkno)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 481 | /* walk tree */ |
| 482 | spin_lock(&pag->pag_buf_lock); |
| 483 | rbp = &pag->pag_buf_tree.rb_node; |
| 484 | parent = NULL; |
| 485 | bp = NULL; |
| 486 | while (*rbp) { |
| 487 | parent = *rbp; |
| 488 | bp = rb_entry(parent, struct xfs_buf, b_rbnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 490 | if (blkno < bp->b_bn) |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 491 | rbp = &(*rbp)->rb_left; |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 492 | else if (blkno > bp->b_bn) |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 493 | rbp = &(*rbp)->rb_right; |
| 494 | else { |
| 495 | /* |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 496 | * found a block number match. If the range doesn't |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 497 | * match, the only way this is allowed is if the buffer |
| 498 | * in the cache is stale and the transaction that made |
| 499 | * it stale has not yet committed. i.e. we are |
| 500 | * reallocating a busy extent. Skip this buffer and |
| 501 | * continue searching to the right for an exact match. |
| 502 | */ |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 503 | if (bp->b_length != numblks) { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 504 | ASSERT(bp->b_flags & XBF_STALE); |
| 505 | rbp = &(*rbp)->rb_right; |
| 506 | continue; |
| 507 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 508 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | goto found; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /* No match found */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 514 | if (new_bp) { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 515 | rb_link_node(&new_bp->b_rbnode, parent, rbp); |
| 516 | rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree); |
| 517 | /* the buffer keeps the perag reference until it is freed */ |
| 518 | new_bp->b_pag = pag; |
| 519 | spin_unlock(&pag->pag_buf_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 521 | XFS_STATS_INC(xb_miss_locked); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 522 | spin_unlock(&pag->pag_buf_lock); |
| 523 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 525 | return new_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | found: |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 528 | spin_unlock(&pag->pag_buf_lock); |
| 529 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 531 | if (!xfs_buf_trylock(bp)) { |
| 532 | if (flags & XBF_TRYLOCK) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 533 | xfs_buf_rele(bp); |
| 534 | XFS_STATS_INC(xb_busy_locked); |
| 535 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 537 | xfs_buf_lock(bp); |
| 538 | XFS_STATS_INC(xb_get_locked_waited); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } |
| 540 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 541 | /* |
| 542 | * if the buffer is stale, clear all the external state associated with |
| 543 | * it. We need to keep flags such as how we allocated the buffer memory |
| 544 | * intact here. |
| 545 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 546 | if (bp->b_flags & XBF_STALE) { |
| 547 | ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); |
Dave Chinner | cfb0285 | 2012-11-12 22:54:19 +1100 | [diff] [blame] | 548 | ASSERT(bp->b_iodone == NULL); |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 549 | bp->b_flags &= _XBF_KMEM | _XBF_PAGES; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 550 | bp->b_ops = NULL; |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 551 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 552 | |
| 553 | trace_xfs_buf_find(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 554 | XFS_STATS_INC(xb_get_locked); |
| 555 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | /* |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 559 | * Assembles a buffer covering the specified range. The code is optimised for |
| 560 | * cache hits, as metadata intensive workloads will see 3 orders of magnitude |
| 561 | * more hits than misses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | */ |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 563 | struct xfs_buf * |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 564 | xfs_buf_get_map( |
| 565 | struct xfs_buftarg *target, |
| 566 | struct xfs_buf_map *map, |
| 567 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 568 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | { |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 570 | struct xfs_buf *bp; |
| 571 | struct xfs_buf *new_bp; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 572 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 574 | bp = _xfs_buf_find(target, map, nmaps, flags, NULL); |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 575 | if (likely(bp)) |
| 576 | goto found; |
| 577 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 578 | new_bp = _xfs_buf_alloc(target, map, nmaps, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 579 | if (unlikely(!new_bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | return NULL; |
| 581 | |
Dave Chinner | fe2429b | 2012-04-23 15:58:45 +1000 | [diff] [blame] | 582 | error = xfs_buf_allocate_memory(new_bp, flags); |
| 583 | if (error) { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 584 | xfs_buf_free(new_bp); |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 585 | return NULL; |
| 586 | } |
| 587 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 588 | bp = _xfs_buf_find(target, map, nmaps, flags, new_bp); |
Dave Chinner | fe2429b | 2012-04-23 15:58:45 +1000 | [diff] [blame] | 589 | if (!bp) { |
| 590 | xfs_buf_free(new_bp); |
| 591 | return NULL; |
| 592 | } |
| 593 | |
| 594 | if (bp != new_bp) |
| 595 | xfs_buf_free(new_bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 597 | found: |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 598 | if (!bp->b_addr) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 599 | error = _xfs_buf_map_pages(bp, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | if (unlikely(error)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 601 | xfs_warn(target->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 602 | "%s: failed to map pagesn", __func__); |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 603 | xfs_buf_relse(bp); |
| 604 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | } |
| 607 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 608 | XFS_STATS_INC(xb_get); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 609 | trace_xfs_buf_get(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 610 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
| 612 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 613 | STATIC int |
| 614 | _xfs_buf_read( |
| 615 | xfs_buf_t *bp, |
| 616 | xfs_buf_flags_t flags) |
| 617 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 618 | ASSERT(!(flags & XBF_WRITE)); |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 619 | ASSERT(bp->b_maps[0].bm_bn != XFS_BUF_DADDR_NULL); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 620 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 621 | bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_READ_AHEAD); |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 622 | bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | XBF_READ_AHEAD); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 623 | |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 624 | if (flags & XBF_ASYNC) { |
| 625 | xfs_buf_submit(bp); |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 626 | return 0; |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 627 | } |
| 628 | return xfs_buf_submit_wait(bp); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 629 | } |
| 630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | xfs_buf_t * |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 632 | xfs_buf_read_map( |
| 633 | struct xfs_buftarg *target, |
| 634 | struct xfs_buf_map *map, |
| 635 | int nmaps, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 636 | xfs_buf_flags_t flags, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 637 | const struct xfs_buf_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 639 | struct xfs_buf *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 641 | flags |= XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 643 | bp = xfs_buf_get_map(target, map, nmaps, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 644 | if (bp) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 645 | trace_xfs_buf_read(bp, flags, _RET_IP_); |
| 646 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 647 | if (!XFS_BUF_ISDONE(bp)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 648 | XFS_STATS_INC(xb_get_read); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 649 | bp->b_ops = ops; |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 650 | _xfs_buf_read(bp, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 651 | } else if (flags & XBF_ASYNC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | /* |
| 653 | * Read ahead call which is already satisfied, |
| 654 | * drop the buffer |
| 655 | */ |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 656 | xfs_buf_relse(bp); |
| 657 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | /* We do not want read in the flags */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 660 | bp->b_flags &= ~XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | } |
| 663 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 664 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 668 | * If we are not low on memory then do the readahead in a deadlock |
| 669 | * safe manner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | */ |
| 671 | void |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 672 | xfs_buf_readahead_map( |
| 673 | struct xfs_buftarg *target, |
| 674 | struct xfs_buf_map *map, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 675 | int nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 676 | const struct xfs_buf_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 678 | if (bdi_read_congested(target->bt_bdi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | return; |
| 680 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 681 | xfs_buf_read_map(target, map, nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 682 | XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD, ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 685 | /* |
| 686 | * Read an uncached buffer from disk. Allocates and returns a locked |
| 687 | * buffer containing the disk contents or nothing. |
| 688 | */ |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 689 | int |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 690 | xfs_buf_read_uncached( |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 691 | struct xfs_buftarg *target, |
| 692 | xfs_daddr_t daddr, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 693 | size_t numblks, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 694 | int flags, |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 695 | struct xfs_buf **bpp, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 696 | const struct xfs_buf_ops *ops) |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 697 | { |
Dave Chinner | eab4e63 | 2012-11-12 22:54:02 +1100 | [diff] [blame] | 698 | struct xfs_buf *bp; |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 699 | |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 700 | *bpp = NULL; |
| 701 | |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 702 | bp = xfs_buf_get_uncached(target, numblks, flags); |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 703 | if (!bp) |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 704 | return -ENOMEM; |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 705 | |
| 706 | /* set up the buffer for a read IO */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 707 | ASSERT(bp->b_map_count == 1); |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 708 | bp->b_bn = XFS_BUF_DADDR_NULL; /* always null for uncached buffers */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 709 | bp->b_maps[0].bm_bn = daddr; |
Dave Chinner | cbb7baab | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 710 | bp->b_flags |= XBF_READ; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 711 | bp->b_ops = ops; |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 712 | |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 713 | xfs_buf_submit_wait(bp); |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 714 | if (bp->b_error) { |
| 715 | int error = bp->b_error; |
Christoph Hellwig | 83a0adc | 2013-12-17 00:03:52 -0800 | [diff] [blame] | 716 | xfs_buf_relse(bp); |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 717 | return error; |
Christoph Hellwig | 83a0adc | 2013-12-17 00:03:52 -0800 | [diff] [blame] | 718 | } |
Dave Chinner | ba37267 | 2014-10-02 09:05:32 +1000 | [diff] [blame] | 719 | |
| 720 | *bpp = bp; |
| 721 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
| 723 | |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 724 | /* |
| 725 | * Return a buffer allocated as an empty buffer and associated to external |
| 726 | * memory via xfs_buf_associate_memory() back to it's empty state. |
| 727 | */ |
| 728 | void |
| 729 | xfs_buf_set_empty( |
| 730 | struct xfs_buf *bp, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 731 | size_t numblks) |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 732 | { |
| 733 | if (bp->b_pages) |
| 734 | _xfs_buf_free_pages(bp); |
| 735 | |
| 736 | bp->b_pages = NULL; |
| 737 | bp->b_page_count = 0; |
| 738 | bp->b_addr = NULL; |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 739 | bp->b_length = numblks; |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 740 | bp->b_io_length = numblks; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 741 | |
| 742 | ASSERT(bp->b_map_count == 1); |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 743 | bp->b_bn = XFS_BUF_DADDR_NULL; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 744 | bp->b_maps[0].bm_bn = XFS_BUF_DADDR_NULL; |
| 745 | bp->b_maps[0].bm_len = bp->b_length; |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 746 | } |
| 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | static inline struct page * |
| 749 | mem_to_page( |
| 750 | void *addr) |
| 751 | { |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 752 | if ((!is_vmalloc_addr(addr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | return virt_to_page(addr); |
| 754 | } else { |
| 755 | return vmalloc_to_page(addr); |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 760 | xfs_buf_associate_memory( |
| 761 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | void *mem, |
| 763 | size_t len) |
| 764 | { |
| 765 | int rval; |
| 766 | int i = 0; |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 767 | unsigned long pageaddr; |
| 768 | unsigned long offset; |
| 769 | size_t buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | int page_count; |
| 771 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 772 | pageaddr = (unsigned long)mem & PAGE_MASK; |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 773 | offset = (unsigned long)mem - pageaddr; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 774 | buflen = PAGE_ALIGN(len + offset); |
| 775 | page_count = buflen >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | /* Free any previous set of page pointers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 778 | if (bp->b_pages) |
| 779 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 781 | bp->b_pages = NULL; |
| 782 | bp->b_addr = mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 784 | rval = _xfs_buf_get_pages(bp, page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | if (rval) |
| 786 | return rval; |
| 787 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 788 | bp->b_offset = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 790 | for (i = 0; i < bp->b_page_count; i++) { |
| 791 | bp->b_pages[i] = mem_to_page((void *)pageaddr); |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 792 | pageaddr += PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 795 | bp->b_io_length = BTOBB(len); |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 796 | bp->b_length = BTOBB(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | xfs_buf_t * |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 802 | xfs_buf_get_uncached( |
| 803 | struct xfs_buftarg *target, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 804 | size_t numblks, |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 805 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | { |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 807 | unsigned long page_count; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 808 | int error, i; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 809 | struct xfs_buf *bp; |
| 810 | DEFINE_SINGLE_BUF_MAP(map, XFS_BUF_DADDR_NULL, numblks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 812 | bp = _xfs_buf_alloc(target, &map, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | if (unlikely(bp == NULL)) |
| 814 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 816 | page_count = PAGE_ALIGN(numblks << BBSHIFT) >> PAGE_SHIFT; |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 817 | error = _xfs_buf_get_pages(bp, page_count); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 818 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | goto fail_free_buf; |
| 820 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 821 | for (i = 0; i < page_count; i++) { |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 822 | bp->b_pages[i] = alloc_page(xb_to_gfp(flags)); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 823 | if (!bp->b_pages[i]) |
| 824 | goto fail_free_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 826 | bp->b_flags |= _XBF_PAGES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 828 | error = _xfs_buf_map_pages(bp, 0); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 829 | if (unlikely(error)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 830 | xfs_warn(target->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 831 | "%s: failed to map pages", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | goto fail_free_mem; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 833 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 835 | trace_xfs_buf_get_uncached(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return bp; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | fail_free_mem: |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 839 | while (--i >= 0) |
| 840 | __free_page(bp->b_pages[i]); |
Christoph Hellwig | ca165b8 | 2007-05-24 15:21:11 +1000 | [diff] [blame] | 841 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | fail_free_buf: |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 843 | xfs_buf_free_maps(bp); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 844 | kmem_zone_free(xfs_buf_zone, bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | fail: |
| 846 | return NULL; |
| 847 | } |
| 848 | |
| 849 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | * Increment reference count on buffer, to hold the buffer concurrently |
| 851 | * with another thread which may release (free) the buffer asynchronously. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | * Must hold the buffer already to call this function. |
| 853 | */ |
| 854 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 855 | xfs_buf_hold( |
| 856 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 858 | trace_xfs_buf_hold(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 859 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | } |
| 861 | |
| 862 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 863 | * Releases a hold on the specified buffer. If the |
| 864 | * the hold count is 1, calls xfs_buf_free. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | */ |
| 866 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 867 | xfs_buf_rele( |
| 868 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 870 | struct xfs_perag *pag = bp->b_pag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 872 | trace_xfs_buf_rele(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 874 | if (!pag) { |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 875 | ASSERT(list_empty(&bp->b_lru)); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 876 | ASSERT(RB_EMPTY_NODE(&bp->b_rbnode)); |
Nathan Scott | fad3aa1 | 2006-02-01 12:14:52 +1100 | [diff] [blame] | 877 | if (atomic_dec_and_test(&bp->b_hold)) |
| 878 | xfs_buf_free(bp); |
| 879 | return; |
| 880 | } |
| 881 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 882 | ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode)); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 883 | |
Lachlan McIlroy | 3790689 | 2008-08-13 15:42:10 +1000 | [diff] [blame] | 884 | ASSERT(atomic_read(&bp->b_hold) > 0); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 885 | if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 886 | spin_lock(&bp->b_lock); |
| 887 | if (!(bp->b_flags & XBF_STALE) && atomic_read(&bp->b_lru_ref)) { |
| 888 | /* |
| 889 | * If the buffer is added to the LRU take a new |
| 890 | * reference to the buffer for the LRU and clear the |
| 891 | * (now stale) dispose list state flag |
| 892 | */ |
| 893 | if (list_lru_add(&bp->b_target->bt_lru, &bp->b_lru)) { |
| 894 | bp->b_state &= ~XFS_BSTATE_DISPOSE; |
| 895 | atomic_inc(&bp->b_hold); |
| 896 | } |
| 897 | spin_unlock(&bp->b_lock); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 898 | spin_unlock(&pag->pag_buf_lock); |
Christoph Hellwig | 7f14d0a | 2005-11-02 15:09:35 +1100 | [diff] [blame] | 899 | } else { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 900 | /* |
| 901 | * most of the time buffers will already be removed from |
| 902 | * the LRU, so optimise that case by checking for the |
| 903 | * XFS_BSTATE_DISPOSE flag indicating the last list the |
| 904 | * buffer was on was the disposal list |
| 905 | */ |
| 906 | if (!(bp->b_state & XFS_BSTATE_DISPOSE)) { |
| 907 | list_lru_del(&bp->b_target->bt_lru, &bp->b_lru); |
| 908 | } else { |
| 909 | ASSERT(list_empty(&bp->b_lru)); |
| 910 | } |
| 911 | spin_unlock(&bp->b_lock); |
| 912 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 913 | ASSERT(!(bp->b_flags & _XBF_DELWRI_Q)); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 914 | rb_erase(&bp->b_rbnode, &pag->pag_buf_tree); |
| 915 | spin_unlock(&pag->pag_buf_lock); |
| 916 | xfs_perag_put(pag); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 917 | xfs_buf_free(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | |
| 923 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 924 | * Lock a buffer object, if it is not already locked. |
Dave Chinner | 90810b9 | 2010-11-30 15:16:16 +1100 | [diff] [blame] | 925 | * |
| 926 | * If we come across a stale, pinned, locked buffer, we know that we are |
| 927 | * being asked to lock a buffer that has been reallocated. Because it is |
| 928 | * pinned, we know that the log has not been pushed to disk and hence it |
| 929 | * will still be locked. Rather than continuing to have trylock attempts |
| 930 | * fail until someone else pushes the log, push it ourselves before |
| 931 | * returning. This means that the xfsaild will not get stuck trying |
| 932 | * to push on stale inode buffers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | */ |
| 934 | int |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 935 | xfs_buf_trylock( |
| 936 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | { |
| 938 | int locked; |
| 939 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 940 | locked = down_trylock(&bp->b_sema) == 0; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 941 | if (locked) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 942 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 943 | |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 944 | trace_xfs_buf_trylock(bp, _RET_IP_); |
| 945 | return locked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
| 948 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 949 | * Lock a buffer object. |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 950 | * |
| 951 | * If we come across a stale, pinned, locked buffer, we know that we |
| 952 | * are being asked to lock a buffer that has been reallocated. Because |
| 953 | * it is pinned, we know that the log has not been pushed to disk and |
| 954 | * hence it will still be locked. Rather than sleeping until someone |
| 955 | * else pushes the log, push it ourselves before trying to get the lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 957 | void |
| 958 | xfs_buf_lock( |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 959 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 961 | trace_xfs_buf_lock(bp, _RET_IP_); |
| 962 | |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 963 | if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE)) |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 964 | xfs_log_force(bp->b_target->bt_mount, 0); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 965 | down(&bp->b_sema); |
| 966 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 967 | |
| 968 | trace_xfs_buf_lock_done(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
| 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 972 | xfs_buf_unlock( |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 973 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 975 | XB_CLEAR_OWNER(bp); |
| 976 | up(&bp->b_sema); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 977 | |
| 978 | trace_xfs_buf_unlock(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | } |
| 980 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 981 | STATIC void |
| 982 | xfs_buf_wait_unpin( |
| 983 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | { |
| 985 | DECLARE_WAITQUEUE (wait, current); |
| 986 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 987 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | return; |
| 989 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 990 | add_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | for (;;) { |
| 992 | set_current_state(TASK_UNINTERRUPTIBLE); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 993 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | break; |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 995 | io_schedule(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 997 | remove_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | set_current_state(TASK_RUNNING); |
| 999 | } |
| 1000 | |
| 1001 | /* |
| 1002 | * Buffer Utility Routines |
| 1003 | */ |
| 1004 | |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1005 | void |
| 1006 | xfs_buf_ioend( |
| 1007 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | { |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1009 | bool read = bp->b_flags & XBF_READ; |
| 1010 | |
| 1011 | trace_xfs_buf_iodone(bp, _RET_IP_); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1012 | |
| 1013 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
Dave Chinner | d5929de | 2013-02-27 13:25:54 +1100 | [diff] [blame] | 1014 | |
Dave Chinner | 61be9c5 | 2014-10-02 09:04:31 +1000 | [diff] [blame] | 1015 | /* |
| 1016 | * Pull in IO completion errors now. We are guaranteed to be running |
| 1017 | * single threaded, so we don't need the lock to read b_io_error. |
| 1018 | */ |
| 1019 | if (!bp->b_error && bp->b_io_error) |
| 1020 | xfs_buf_ioerror(bp, bp->b_io_error); |
| 1021 | |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1022 | /* Only validate buffers that were read without errors */ |
| 1023 | if (read && !bp->b_error && bp->b_ops) { |
| 1024 | ASSERT(!bp->b_iodone); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1025 | bp->b_ops->verify_read(bp); |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1026 | } |
| 1027 | |
| 1028 | if (!bp->b_error) |
| 1029 | bp->b_flags |= XBF_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Christoph Hellwig | 80f6c29 | 2010-08-18 05:29:11 -0400 | [diff] [blame] | 1031 | if (bp->b_iodone) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1032 | (*(bp->b_iodone))(bp); |
| 1033 | else if (bp->b_flags & XBF_ASYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | xfs_buf_relse(bp); |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1035 | else |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1036 | complete(&bp->b_iowait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | } |
| 1038 | |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1039 | static void |
| 1040 | xfs_buf_ioend_work( |
| 1041 | struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | { |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1043 | struct xfs_buf *bp = |
Brian Foster | b29c70f | 2014-12-04 09:43:17 +1100 | [diff] [blame] | 1044 | container_of(work, xfs_buf_t, b_ioend_work); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1045 | |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1046 | xfs_buf_ioend(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | } |
| 1048 | |
| 1049 | void |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1050 | xfs_buf_ioend_async( |
| 1051 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | { |
Brian Foster | b29c70f | 2014-12-04 09:43:17 +1100 | [diff] [blame] | 1053 | INIT_WORK(&bp->b_ioend_work, xfs_buf_ioend_work); |
| 1054 | queue_work(bp->b_ioend_wq, &bp->b_ioend_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1058 | xfs_buf_ioerror( |
| 1059 | xfs_buf_t *bp, |
| 1060 | int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1062 | ASSERT(error <= 0 && error >= -1000); |
| 1063 | bp->b_error = error; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1064 | trace_xfs_buf_ioerror(bp, error, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 1067 | void |
| 1068 | xfs_buf_ioerror_alert( |
| 1069 | struct xfs_buf *bp, |
| 1070 | const char *func) |
| 1071 | { |
| 1072 | xfs_alert(bp->b_target->bt_mount, |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 1073 | "metadata I/O error: block 0x%llx (\"%s\") error %d numblks %d", |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1074 | (__uint64_t)XFS_BUF_ADDR(bp), func, -bp->b_error, bp->b_length); |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 1075 | } |
| 1076 | |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1077 | int |
| 1078 | xfs_bwrite( |
| 1079 | struct xfs_buf *bp) |
| 1080 | { |
| 1081 | int error; |
| 1082 | |
| 1083 | ASSERT(xfs_buf_islocked(bp)); |
| 1084 | |
| 1085 | bp->b_flags |= XBF_WRITE; |
Dave Chinner | 2718775 | 2014-10-02 09:04:56 +1000 | [diff] [blame] | 1086 | bp->b_flags &= ~(XBF_ASYNC | XBF_READ | _XBF_DELWRI_Q | |
| 1087 | XBF_WRITE_FAIL | XBF_DONE); |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1088 | |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1089 | error = xfs_buf_submit_wait(bp); |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1090 | if (error) { |
| 1091 | xfs_force_shutdown(bp->b_target->bt_mount, |
| 1092 | SHUTDOWN_META_IO_ERROR); |
| 1093 | } |
| 1094 | return error; |
| 1095 | } |
| 1096 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1097 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1098 | xfs_buf_bio_end_io( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | struct bio *bio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | int error) |
| 1101 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1102 | xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1104 | /* |
| 1105 | * don't overwrite existing errors - otherwise we can lose errors on |
| 1106 | * buffers that require multiple bios to complete. |
| 1107 | */ |
Dave Chinner | 61be9c5 | 2014-10-02 09:04:31 +1000 | [diff] [blame] | 1108 | if (error) { |
| 1109 | spin_lock(&bp->b_lock); |
| 1110 | if (!bp->b_io_error) |
| 1111 | bp->b_io_error = error; |
| 1112 | spin_unlock(&bp->b_lock); |
| 1113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1115 | if (!bp->b_error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 1116 | invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); |
| 1117 | |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1118 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) |
| 1119 | xfs_buf_ioend_async(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } |
| 1122 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1123 | static void |
| 1124 | xfs_buf_ioapply_map( |
| 1125 | struct xfs_buf *bp, |
| 1126 | int map, |
| 1127 | int *buf_offset, |
| 1128 | int *count, |
| 1129 | int rw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1131 | int page_index; |
| 1132 | int total_nr_pages = bp->b_page_count; |
| 1133 | int nr_pages; |
| 1134 | struct bio *bio; |
| 1135 | sector_t sector = bp->b_maps[map].bm_bn; |
| 1136 | int size; |
| 1137 | int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1139 | total_nr_pages = bp->b_page_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1141 | /* skip the pages in the buffer before the start offset */ |
| 1142 | page_index = 0; |
| 1143 | offset = *buf_offset; |
| 1144 | while (offset >= PAGE_SIZE) { |
| 1145 | page_index++; |
| 1146 | offset -= PAGE_SIZE; |
Christoph Hellwig | f538d4d | 2005-11-02 10:26:59 +1100 | [diff] [blame] | 1147 | } |
| 1148 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1149 | /* |
| 1150 | * Limit the IO size to the length of the current vector, and update the |
| 1151 | * remaining IO count for the next time around. |
| 1152 | */ |
| 1153 | size = min_t(int, BBTOB(bp->b_maps[map].bm_len), *count); |
| 1154 | *count -= size; |
| 1155 | *buf_offset += size; |
Christoph Hellwig | 34951f5 | 2011-07-26 15:06:44 +0000 | [diff] [blame] | 1156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | next_chunk: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1158 | atomic_inc(&bp->b_io_remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); |
| 1160 | if (nr_pages > total_nr_pages) |
| 1161 | nr_pages = total_nr_pages; |
| 1162 | |
| 1163 | bio = bio_alloc(GFP_NOIO, nr_pages); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1164 | bio->bi_bdev = bp->b_target->bt_bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1165 | bio->bi_iter.bi_sector = sector; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1166 | bio->bi_end_io = xfs_buf_bio_end_io; |
| 1167 | bio->bi_private = bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1169 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1170 | for (; size && nr_pages; nr_pages--, page_index++) { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1171 | int rbytes, nbytes = PAGE_SIZE - offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
| 1173 | if (nbytes > size) |
| 1174 | nbytes = size; |
| 1175 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1176 | rbytes = bio_add_page(bio, bp->b_pages[page_index], nbytes, |
| 1177 | offset); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1178 | if (rbytes < nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | break; |
| 1180 | |
| 1181 | offset = 0; |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 1182 | sector += BTOBB(nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | size -= nbytes; |
| 1184 | total_nr_pages--; |
| 1185 | } |
| 1186 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1187 | if (likely(bio->bi_iter.bi_size)) { |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 1188 | if (xfs_buf_is_vmapped(bp)) { |
| 1189 | flush_kernel_vmap_range(bp->b_addr, |
| 1190 | xfs_buf_vmap_len(bp)); |
| 1191 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | submit_bio(rw, bio); |
| 1193 | if (size) |
| 1194 | goto next_chunk; |
| 1195 | } else { |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1196 | /* |
| 1197 | * This is guaranteed not to be the last io reference count |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1198 | * because the caller (xfs_buf_submit) holds a count itself. |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1199 | */ |
| 1200 | atomic_dec(&bp->b_io_remaining); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1201 | xfs_buf_ioerror(bp, -EIO); |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 1202 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | } |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1204 | |
| 1205 | } |
| 1206 | |
| 1207 | STATIC void |
| 1208 | _xfs_buf_ioapply( |
| 1209 | struct xfs_buf *bp) |
| 1210 | { |
| 1211 | struct blk_plug plug; |
| 1212 | int rw; |
| 1213 | int offset; |
| 1214 | int size; |
| 1215 | int i; |
| 1216 | |
Dave Chinner | c163f9a | 2013-03-12 23:30:34 +1100 | [diff] [blame] | 1217 | /* |
| 1218 | * Make sure we capture only current IO errors rather than stale errors |
| 1219 | * left over from previous use of the buffer (e.g. failed readahead). |
| 1220 | */ |
| 1221 | bp->b_error = 0; |
| 1222 | |
Brian Foster | b29c70f | 2014-12-04 09:43:17 +1100 | [diff] [blame] | 1223 | /* |
| 1224 | * Initialize the I/O completion workqueue if we haven't yet or the |
| 1225 | * submitter has not opted to specify a custom one. |
| 1226 | */ |
| 1227 | if (!bp->b_ioend_wq) |
| 1228 | bp->b_ioend_wq = bp->b_target->bt_mount->m_buf_workqueue; |
| 1229 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1230 | if (bp->b_flags & XBF_WRITE) { |
| 1231 | if (bp->b_flags & XBF_SYNCIO) |
| 1232 | rw = WRITE_SYNC; |
| 1233 | else |
| 1234 | rw = WRITE; |
| 1235 | if (bp->b_flags & XBF_FUA) |
| 1236 | rw |= REQ_FUA; |
| 1237 | if (bp->b_flags & XBF_FLUSH) |
| 1238 | rw |= REQ_FLUSH; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1239 | |
| 1240 | /* |
| 1241 | * Run the write verifier callback function if it exists. If |
| 1242 | * this function fails it will mark the buffer with an error and |
| 1243 | * the IO should not be dispatched. |
| 1244 | */ |
| 1245 | if (bp->b_ops) { |
| 1246 | bp->b_ops->verify_write(bp); |
| 1247 | if (bp->b_error) { |
| 1248 | xfs_force_shutdown(bp->b_target->bt_mount, |
| 1249 | SHUTDOWN_CORRUPT_INCORE); |
| 1250 | return; |
| 1251 | } |
Dave Chinner | 400b9d8 | 2014-08-04 12:42:40 +1000 | [diff] [blame] | 1252 | } else if (bp->b_bn != XFS_BUF_DADDR_NULL) { |
| 1253 | struct xfs_mount *mp = bp->b_target->bt_mount; |
| 1254 | |
| 1255 | /* |
| 1256 | * non-crc filesystems don't attach verifiers during |
| 1257 | * log recovery, so don't warn for such filesystems. |
| 1258 | */ |
| 1259 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| 1260 | xfs_warn(mp, |
| 1261 | "%s: no ops on block 0x%llx/0x%x", |
| 1262 | __func__, bp->b_bn, bp->b_length); |
| 1263 | xfs_hex_dump(bp->b_addr, 64); |
| 1264 | dump_stack(); |
| 1265 | } |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1266 | } |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1267 | } else if (bp->b_flags & XBF_READ_AHEAD) { |
| 1268 | rw = READA; |
| 1269 | } else { |
| 1270 | rw = READ; |
| 1271 | } |
| 1272 | |
| 1273 | /* we only use the buffer cache for meta-data */ |
| 1274 | rw |= REQ_META; |
| 1275 | |
| 1276 | /* |
| 1277 | * Walk all the vectors issuing IO on them. Set up the initial offset |
| 1278 | * into the buffer and the desired IO size before we start - |
| 1279 | * _xfs_buf_ioapply_vec() will modify them appropriately for each |
| 1280 | * subsequent call. |
| 1281 | */ |
| 1282 | offset = bp->b_offset; |
| 1283 | size = BBTOB(bp->b_io_length); |
| 1284 | blk_start_plug(&plug); |
| 1285 | for (i = 0; i < bp->b_map_count; i++) { |
| 1286 | xfs_buf_ioapply_map(bp, i, &offset, &size, rw); |
| 1287 | if (bp->b_error) |
| 1288 | break; |
| 1289 | if (size <= 0) |
| 1290 | break; /* all done */ |
| 1291 | } |
| 1292 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | } |
| 1294 | |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1295 | /* |
| 1296 | * Asynchronous IO submission path. This transfers the buffer lock ownership and |
| 1297 | * the current reference to the IO. It is not safe to reference the buffer after |
| 1298 | * a call to this function unless the caller holds an additional reference |
| 1299 | * itself. |
| 1300 | */ |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 1301 | void |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1302 | xfs_buf_submit( |
| 1303 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1305 | trace_xfs_buf_submit(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1307 | ASSERT(!(bp->b_flags & _XBF_DELWRI_Q)); |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1308 | ASSERT(bp->b_flags & XBF_ASYNC); |
| 1309 | |
| 1310 | /* on shutdown we stale and complete the buffer immediately */ |
| 1311 | if (XFS_FORCED_SHUTDOWN(bp->b_target->bt_mount)) { |
| 1312 | xfs_buf_ioerror(bp, -EIO); |
| 1313 | bp->b_flags &= ~XBF_DONE; |
| 1314 | xfs_buf_stale(bp); |
| 1315 | xfs_buf_ioend(bp); |
| 1316 | return; |
| 1317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
Christoph Hellwig | 375ec69d | 2011-08-23 08:28:03 +0000 | [diff] [blame] | 1319 | if (bp->b_flags & XBF_WRITE) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1320 | xfs_buf_wait_unpin(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
Dave Chinner | 61be9c5 | 2014-10-02 09:04:31 +1000 | [diff] [blame] | 1322 | /* clear the internal error state to avoid spurious errors */ |
| 1323 | bp->b_io_error = 0; |
| 1324 | |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1325 | /* |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1326 | * The caller's reference is released during I/O completion. |
| 1327 | * This occurs some time after the last b_io_remaining reference is |
| 1328 | * released, so after we drop our Io reference we have to have some |
| 1329 | * other reference to ensure the buffer doesn't go away from underneath |
| 1330 | * us. Take a direct reference to ensure we have safe access to the |
| 1331 | * buffer until we are finished with it. |
Dave Chinner | e11bb80 | 2014-10-02 09:04:11 +1000 | [diff] [blame] | 1332 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | xfs_buf_hold(bp); |
| 1334 | |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1335 | /* |
Dave Chinner | e11bb80 | 2014-10-02 09:04:11 +1000 | [diff] [blame] | 1336 | * Set the count to 1 initially, this will stop an I/O completion |
| 1337 | * callout which happens before we have started all the I/O from calling |
| 1338 | * xfs_buf_ioend too early. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1340 | atomic_set(&bp->b_io_remaining, 1); |
| 1341 | _xfs_buf_ioapply(bp); |
Dave Chinner | e11bb80 | 2014-10-02 09:04:11 +1000 | [diff] [blame] | 1342 | |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1343 | /* |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1344 | * If _xfs_buf_ioapply failed, we can get back here with only the IO |
| 1345 | * reference we took above. If we drop it to zero, run completion so |
| 1346 | * that we don't return to the caller with completion still pending. |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1347 | */ |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1348 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1349 | if (bp->b_error) |
Dave Chinner | e8aaba9 | 2014-10-02 09:04:22 +1000 | [diff] [blame] | 1350 | xfs_buf_ioend(bp); |
| 1351 | else |
| 1352 | xfs_buf_ioend_async(bp); |
| 1353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1355 | xfs_buf_rele(bp); |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1356 | /* Note: it is not safe to reference bp now we've dropped our ref */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | } |
| 1358 | |
| 1359 | /* |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1360 | * Synchronous buffer IO submission path, read or write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | */ |
| 1362 | int |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1363 | xfs_buf_submit_wait( |
| 1364 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | { |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1366 | int error; |
| 1367 | |
| 1368 | trace_xfs_buf_submit_wait(bp, _RET_IP_); |
| 1369 | |
| 1370 | ASSERT(!(bp->b_flags & (_XBF_DELWRI_Q | XBF_ASYNC))); |
| 1371 | |
| 1372 | if (XFS_FORCED_SHUTDOWN(bp->b_target->bt_mount)) { |
| 1373 | xfs_buf_ioerror(bp, -EIO); |
| 1374 | xfs_buf_stale(bp); |
| 1375 | bp->b_flags &= ~XBF_DONE; |
| 1376 | return -EIO; |
| 1377 | } |
| 1378 | |
| 1379 | if (bp->b_flags & XBF_WRITE) |
| 1380 | xfs_buf_wait_unpin(bp); |
| 1381 | |
| 1382 | /* clear the internal error state to avoid spurious errors */ |
| 1383 | bp->b_io_error = 0; |
| 1384 | |
| 1385 | /* |
| 1386 | * For synchronous IO, the IO does not inherit the submitters reference |
| 1387 | * count, nor the buffer lock. Hence we cannot release the reference we |
| 1388 | * are about to take until we've waited for all IO completion to occur, |
| 1389 | * including any xfs_buf_ioend_async() work that may be pending. |
| 1390 | */ |
| 1391 | xfs_buf_hold(bp); |
| 1392 | |
| 1393 | /* |
| 1394 | * Set the count to 1 initially, this will stop an I/O completion |
| 1395 | * callout which happens before we have started all the I/O from calling |
| 1396 | * xfs_buf_ioend too early. |
| 1397 | */ |
| 1398 | atomic_set(&bp->b_io_remaining, 1); |
| 1399 | _xfs_buf_ioapply(bp); |
| 1400 | |
| 1401 | /* |
| 1402 | * make sure we run completion synchronously if it raced with us and is |
| 1403 | * already complete. |
| 1404 | */ |
| 1405 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) |
| 1406 | xfs_buf_ioend(bp); |
| 1407 | |
| 1408 | /* wait for completion before gathering the error from the buffer */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1409 | trace_xfs_buf_iowait(bp, _RET_IP_); |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1410 | wait_for_completion(&bp->b_iowait); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1411 | trace_xfs_buf_iowait_done(bp, _RET_IP_); |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1412 | error = bp->b_error; |
| 1413 | |
| 1414 | /* |
| 1415 | * all done now, we can release the hold that keeps the buffer |
| 1416 | * referenced for the entire IO. |
| 1417 | */ |
| 1418 | xfs_buf_rele(bp); |
| 1419 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | } |
| 1421 | |
Christoph Hellwig | 88ee2df | 2015-06-22 09:44:29 +1000 | [diff] [blame] | 1422 | void * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1423 | xfs_buf_offset( |
Christoph Hellwig | 88ee2df | 2015-06-22 09:44:29 +1000 | [diff] [blame] | 1424 | struct xfs_buf *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | size_t offset) |
| 1426 | { |
| 1427 | struct page *page; |
| 1428 | |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 1429 | if (bp->b_addr) |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 1430 | return bp->b_addr + offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1432 | offset += bp->b_offset; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1433 | page = bp->b_pages[offset >> PAGE_SHIFT]; |
Christoph Hellwig | 88ee2df | 2015-06-22 09:44:29 +1000 | [diff] [blame] | 1434 | return page_address(page) + (offset & (PAGE_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | } |
| 1436 | |
| 1437 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | * Move data into or out of a buffer. |
| 1439 | */ |
| 1440 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1441 | xfs_buf_iomove( |
| 1442 | xfs_buf_t *bp, /* buffer to process */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | size_t boff, /* starting buffer offset */ |
| 1444 | size_t bsize, /* length to copy */ |
Dave Chinner | b9c4864 | 2010-01-20 10:47:39 +1100 | [diff] [blame] | 1445 | void *data, /* data address */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1446 | xfs_buf_rw_t mode) /* read/write/zero flag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | { |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1448 | size_t bend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | bend = boff + bsize; |
| 1451 | while (boff < bend) { |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1452 | struct page *page; |
| 1453 | int page_index, page_offset, csize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1455 | page_index = (boff + bp->b_offset) >> PAGE_SHIFT; |
| 1456 | page_offset = (boff + bp->b_offset) & ~PAGE_MASK; |
| 1457 | page = bp->b_pages[page_index]; |
| 1458 | csize = min_t(size_t, PAGE_SIZE - page_offset, |
| 1459 | BBTOB(bp->b_io_length) - boff); |
| 1460 | |
| 1461 | ASSERT((csize + page_offset) <= PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
| 1463 | switch (mode) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1464 | case XBRW_ZERO: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1465 | memset(page_address(page) + page_offset, 0, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1467 | case XBRW_READ: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1468 | memcpy(data, page_address(page) + page_offset, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1470 | case XBRW_WRITE: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1471 | memcpy(page_address(page) + page_offset, data, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | } |
| 1473 | |
| 1474 | boff += csize; |
| 1475 | data += csize; |
| 1476 | } |
| 1477 | } |
| 1478 | |
| 1479 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1480 | * Handling of buffer targets (buftargs). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | */ |
| 1482 | |
| 1483 | /* |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1484 | * Wait for any bufs with callbacks that have been submitted but have not yet |
| 1485 | * returned. These buffers will have an elevated hold count, so wait on those |
| 1486 | * while freeing all the buffers only held by the LRU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | */ |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1488 | static enum lru_status |
| 1489 | xfs_buftarg_wait_rele( |
| 1490 | struct list_head *item, |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 1491 | struct list_lru_one *lru, |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1492 | spinlock_t *lru_lock, |
| 1493 | void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1495 | { |
| 1496 | struct xfs_buf *bp = container_of(item, struct xfs_buf, b_lru); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1497 | struct list_head *dispose = arg; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1498 | |
| 1499 | if (atomic_read(&bp->b_hold) > 1) { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1500 | /* need to wait, so skip it this pass */ |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1501 | trace_xfs_buf_wait_buftarg(bp, _RET_IP_); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1502 | return LRU_SKIP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | } |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1504 | if (!spin_trylock(&bp->b_lock)) |
| 1505 | return LRU_SKIP; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1506 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1507 | /* |
| 1508 | * clear the LRU reference count so the buffer doesn't get |
| 1509 | * ignored in xfs_buf_rele(). |
| 1510 | */ |
| 1511 | atomic_set(&bp->b_lru_ref, 0); |
| 1512 | bp->b_state |= XFS_BSTATE_DISPOSE; |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 1513 | list_lru_isolate_move(lru, item, dispose); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1514 | spin_unlock(&bp->b_lock); |
| 1515 | return LRU_REMOVED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | } |
| 1517 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1518 | void |
| 1519 | xfs_wait_buftarg( |
| 1520 | struct xfs_buftarg *btp) |
| 1521 | { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1522 | LIST_HEAD(dispose); |
| 1523 | int loop = 0; |
| 1524 | |
| 1525 | /* loop until there is nothing left on the lru list. */ |
| 1526 | while (list_lru_count(&btp->bt_lru)) { |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1527 | list_lru_walk(&btp->bt_lru, xfs_buftarg_wait_rele, |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1528 | &dispose, LONG_MAX); |
| 1529 | |
| 1530 | while (!list_empty(&dispose)) { |
| 1531 | struct xfs_buf *bp; |
| 1532 | bp = list_first_entry(&dispose, struct xfs_buf, b_lru); |
| 1533 | list_del_init(&bp->b_lru); |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame] | 1534 | if (bp->b_flags & XBF_WRITE_FAIL) { |
| 1535 | xfs_alert(btp->bt_mount, |
| 1536 | "Corruption Alert: Buffer at block 0x%llx had permanent write failures!\n" |
| 1537 | "Please run xfs_repair to determine the extent of the problem.", |
| 1538 | (long long)bp->b_bn); |
| 1539 | } |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1540 | xfs_buf_rele(bp); |
| 1541 | } |
| 1542 | if (loop++ != 0) |
| 1543 | delay(100); |
| 1544 | } |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | static enum lru_status |
| 1548 | xfs_buftarg_isolate( |
| 1549 | struct list_head *item, |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 1550 | struct list_lru_one *lru, |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1551 | spinlock_t *lru_lock, |
| 1552 | void *arg) |
| 1553 | { |
| 1554 | struct xfs_buf *bp = container_of(item, struct xfs_buf, b_lru); |
| 1555 | struct list_head *dispose = arg; |
| 1556 | |
| 1557 | /* |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1558 | * we are inverting the lru lock/bp->b_lock here, so use a trylock. |
| 1559 | * If we fail to get the lock, just skip it. |
| 1560 | */ |
| 1561 | if (!spin_trylock(&bp->b_lock)) |
| 1562 | return LRU_SKIP; |
| 1563 | /* |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1564 | * Decrement the b_lru_ref count unless the value is already |
| 1565 | * zero. If the value is already zero, we need to reclaim the |
| 1566 | * buffer, otherwise it gets another trip through the LRU. |
| 1567 | */ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1568 | if (!atomic_add_unless(&bp->b_lru_ref, -1, 0)) { |
| 1569 | spin_unlock(&bp->b_lock); |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1570 | return LRU_ROTATE; |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1571 | } |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1572 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1573 | bp->b_state |= XFS_BSTATE_DISPOSE; |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 1574 | list_lru_isolate_move(lru, item, dispose); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1575 | spin_unlock(&bp->b_lock); |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1576 | return LRU_REMOVED; |
| 1577 | } |
| 1578 | |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1579 | static unsigned long |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1580 | xfs_buftarg_shrink_scan( |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1581 | struct shrinker *shrink, |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 1582 | struct shrink_control *sc) |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1583 | { |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1584 | struct xfs_buftarg *btp = container_of(shrink, |
| 1585 | struct xfs_buftarg, bt_shrinker); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1586 | LIST_HEAD(dispose); |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1587 | unsigned long freed; |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1588 | |
Vladimir Davydov | 503c358 | 2015-02-12 14:58:47 -0800 | [diff] [blame] | 1589 | freed = list_lru_shrink_walk(&btp->bt_lru, sc, |
| 1590 | xfs_buftarg_isolate, &dispose); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1591 | |
| 1592 | while (!list_empty(&dispose)) { |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1593 | struct xfs_buf *bp; |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1594 | bp = list_first_entry(&dispose, struct xfs_buf, b_lru); |
| 1595 | list_del_init(&bp->b_lru); |
| 1596 | xfs_buf_rele(bp); |
| 1597 | } |
| 1598 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1599 | return freed; |
| 1600 | } |
| 1601 | |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1602 | static unsigned long |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1603 | xfs_buftarg_shrink_count( |
| 1604 | struct shrinker *shrink, |
| 1605 | struct shrink_control *sc) |
| 1606 | { |
| 1607 | struct xfs_buftarg *btp = container_of(shrink, |
| 1608 | struct xfs_buftarg, bt_shrinker); |
Vladimir Davydov | 503c358 | 2015-02-12 14:58:47 -0800 | [diff] [blame] | 1609 | return list_lru_shrink_count(&btp->bt_lru, sc); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1610 | } |
| 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | void |
| 1613 | xfs_free_buftarg( |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1614 | struct xfs_mount *mp, |
| 1615 | struct xfs_buftarg *btp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | { |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1617 | unregister_shrinker(&btp->bt_shrinker); |
Glauber Costa | f5e1dd3 | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 1618 | list_lru_destroy(&btp->bt_lru); |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1619 | |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1620 | if (mp->m_flags & XFS_MOUNT_BARRIER) |
| 1621 | xfs_blkdev_issue_flush(btp); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1622 | |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1623 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | } |
| 1625 | |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1626 | int |
| 1627 | xfs_setsize_buftarg( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | xfs_buftarg_t *btp, |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1629 | unsigned int sectorsize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | { |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 1631 | /* Set up metadata sector size info */ |
Eric Sandeen | 6da5417 | 2014-01-21 16:45:52 -0600 | [diff] [blame] | 1632 | btp->bt_meta_sectorsize = sectorsize; |
| 1633 | btp->bt_meta_sectormask = sectorsize - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1635 | if (set_blocksize(btp->bt_bdev, sectorsize)) { |
Christoph Hellwig | 02b102d | 2011-10-10 16:52:51 +0000 | [diff] [blame] | 1636 | char name[BDEVNAME_SIZE]; |
| 1637 | |
| 1638 | bdevname(btp->bt_bdev, name); |
| 1639 | |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 1640 | xfs_warn(btp->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 1641 | "Cannot set_blocksize to %u on device %s", |
Christoph Hellwig | 02b102d | 2011-10-10 16:52:51 +0000 | [diff] [blame] | 1642 | sectorsize, name); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1643 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | } |
| 1645 | |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 1646 | /* Set up device logical sector size mask */ |
| 1647 | btp->bt_logical_sectorsize = bdev_logical_block_size(btp->bt_bdev); |
| 1648 | btp->bt_logical_sectormask = bdev_logical_block_size(btp->bt_bdev) - 1; |
| 1649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | return 0; |
| 1651 | } |
| 1652 | |
| 1653 | /* |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1654 | * When allocating the initial buffer target we have not yet |
| 1655 | * read in the superblock, so don't know what sized sectors |
| 1656 | * are being used at this early stage. Play safe. |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1657 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | STATIC int |
| 1659 | xfs_setsize_buftarg_early( |
| 1660 | xfs_buftarg_t *btp, |
| 1661 | struct block_device *bdev) |
| 1662 | { |
Eric Sandeen | a96c415 | 2014-04-14 19:00:29 +1000 | [diff] [blame] | 1663 | return xfs_setsize_buftarg(btp, bdev_logical_block_size(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | } |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | xfs_buftarg_t * |
| 1667 | xfs_alloc_buftarg( |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1668 | struct xfs_mount *mp, |
Eric Sandeen | 34dcefd | 2014-04-14 19:01:00 +1000 | [diff] [blame] | 1669 | struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | { |
| 1671 | xfs_buftarg_t *btp; |
| 1672 | |
Dave Chinner | b17cb36 | 2013-05-20 09:51:12 +1000 | [diff] [blame] | 1673 | btp = kmem_zalloc(sizeof(*btp), KM_SLEEP | KM_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1675 | btp->bt_mount = mp; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1676 | btp->bt_dev = bdev->bd_dev; |
| 1677 | btp->bt_bdev = bdev; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1678 | btp->bt_bdi = blk_get_backing_dev_info(bdev); |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | if (xfs_setsize_buftarg_early(btp, bdev)) |
| 1681 | goto error; |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 1682 | |
| 1683 | if (list_lru_init(&btp->bt_lru)) |
| 1684 | goto error; |
| 1685 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1686 | btp->bt_shrinker.count_objects = xfs_buftarg_shrink_count; |
| 1687 | btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan; |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1688 | btp->bt_shrinker.seeks = DEFAULT_SEEKS; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1689 | btp->bt_shrinker.flags = SHRINKER_NUMA_AWARE; |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1690 | register_shrinker(&btp->bt_shrinker); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | return btp; |
| 1692 | |
| 1693 | error: |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1694 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | return NULL; |
| 1696 | } |
| 1697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | /* |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1699 | * Add a buffer to the delayed write list. |
| 1700 | * |
| 1701 | * This queues a buffer for writeout if it hasn't already been. Note that |
| 1702 | * neither this routine nor the buffer list submission functions perform |
| 1703 | * any internal synchronization. It is expected that the lists are thread-local |
| 1704 | * to the callers. |
| 1705 | * |
| 1706 | * Returns true if we queued up the buffer, or false if it already had |
| 1707 | * been on the buffer list. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | */ |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1709 | bool |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1710 | xfs_buf_delwri_queue( |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1711 | struct xfs_buf *bp, |
| 1712 | struct list_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1714 | ASSERT(xfs_buf_islocked(bp)); |
| 1715 | ASSERT(!(bp->b_flags & XBF_READ)); |
| 1716 | |
| 1717 | /* |
| 1718 | * If the buffer is already marked delwri it already is queued up |
| 1719 | * by someone else for imediate writeout. Just ignore it in that |
| 1720 | * case. |
| 1721 | */ |
| 1722 | if (bp->b_flags & _XBF_DELWRI_Q) { |
| 1723 | trace_xfs_buf_delwri_queued(bp, _RET_IP_); |
| 1724 | return false; |
| 1725 | } |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1726 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1727 | trace_xfs_buf_delwri_queue(bp, _RET_IP_); |
| 1728 | |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 1729 | /* |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1730 | * If a buffer gets written out synchronously or marked stale while it |
| 1731 | * is on a delwri list we lazily remove it. To do this, the other party |
| 1732 | * clears the _XBF_DELWRI_Q flag but otherwise leaves the buffer alone. |
| 1733 | * It remains referenced and on the list. In a rare corner case it |
| 1734 | * might get readded to a delwri list after the synchronous writeout, in |
| 1735 | * which case we need just need to re-add the flag here. |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 1736 | */ |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1737 | bp->b_flags |= _XBF_DELWRI_Q; |
| 1738 | if (list_empty(&bp->b_list)) { |
| 1739 | atomic_inc(&bp->b_hold); |
| 1740 | list_add_tail(&bp->b_list, list); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1741 | } |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1742 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1743 | return true; |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1744 | } |
| 1745 | |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1746 | /* |
| 1747 | * Compare function is more complex than it needs to be because |
| 1748 | * the return value is only 32 bits and we are doing comparisons |
| 1749 | * on 64 bit values |
| 1750 | */ |
| 1751 | static int |
| 1752 | xfs_buf_cmp( |
| 1753 | void *priv, |
| 1754 | struct list_head *a, |
| 1755 | struct list_head *b) |
| 1756 | { |
| 1757 | struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list); |
| 1758 | struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list); |
| 1759 | xfs_daddr_t diff; |
| 1760 | |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 1761 | diff = ap->b_maps[0].bm_bn - bp->b_maps[0].bm_bn; |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1762 | if (diff < 0) |
| 1763 | return -1; |
| 1764 | if (diff > 0) |
| 1765 | return 1; |
| 1766 | return 0; |
| 1767 | } |
| 1768 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1769 | static int |
| 1770 | __xfs_buf_delwri_submit( |
| 1771 | struct list_head *buffer_list, |
| 1772 | struct list_head *io_list, |
| 1773 | bool wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1775 | struct blk_plug plug; |
| 1776 | struct xfs_buf *bp, *n; |
| 1777 | int pinned = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1779 | list_for_each_entry_safe(bp, n, buffer_list, b_list) { |
| 1780 | if (!wait) { |
| 1781 | if (xfs_buf_ispinned(bp)) { |
| 1782 | pinned++; |
| 1783 | continue; |
| 1784 | } |
| 1785 | if (!xfs_buf_trylock(bp)) |
| 1786 | continue; |
| 1787 | } else { |
| 1788 | xfs_buf_lock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1791 | /* |
| 1792 | * Someone else might have written the buffer synchronously or |
| 1793 | * marked it stale in the meantime. In that case only the |
| 1794 | * _XBF_DELWRI_Q flag got cleared, and we have to drop the |
| 1795 | * reference and remove it from the list here. |
| 1796 | */ |
| 1797 | if (!(bp->b_flags & _XBF_DELWRI_Q)) { |
| 1798 | list_del_init(&bp->b_list); |
| 1799 | xfs_buf_relse(bp); |
| 1800 | continue; |
| 1801 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1803 | list_move_tail(&bp->b_list, io_list); |
| 1804 | trace_xfs_buf_delwri_split(bp, _RET_IP_); |
| 1805 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1807 | list_sort(NULL, io_list, xfs_buf_cmp); |
Christoph Hellwig | a1b7ea5 | 2011-03-30 11:05:09 +0000 | [diff] [blame] | 1808 | |
| 1809 | blk_start_plug(&plug); |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1810 | list_for_each_entry_safe(bp, n, io_list, b_list) { |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame] | 1811 | bp->b_flags &= ~(_XBF_DELWRI_Q | XBF_ASYNC | XBF_WRITE_FAIL); |
Dave Chinner | cf53e99 | 2014-10-02 09:04:01 +1000 | [diff] [blame] | 1812 | bp->b_flags |= XBF_WRITE | XBF_ASYNC; |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1813 | |
Dave Chinner | cf53e99 | 2014-10-02 09:04:01 +1000 | [diff] [blame] | 1814 | /* |
| 1815 | * we do all Io submission async. This means if we need to wait |
| 1816 | * for IO completion we need to take an extra reference so the |
| 1817 | * buffer is still valid on the other side. |
| 1818 | */ |
| 1819 | if (wait) |
| 1820 | xfs_buf_hold(bp); |
| 1821 | else |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1822 | list_del_init(&bp->b_list); |
Dave Chinner | 8dac392 | 2014-10-02 09:04:40 +1000 | [diff] [blame] | 1823 | |
Dave Chinner | 595bff7 | 2014-10-02 09:05:14 +1000 | [diff] [blame] | 1824 | xfs_buf_submit(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | } |
Christoph Hellwig | a1b7ea5 | 2011-03-30 11:05:09 +0000 | [diff] [blame] | 1826 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1828 | return pinned; |
| 1829 | } |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 1830 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1831 | /* |
| 1832 | * Write out a buffer list asynchronously. |
| 1833 | * |
| 1834 | * This will take the @buffer_list, write all non-locked and non-pinned buffers |
| 1835 | * out and not wait for I/O completion on any of the buffers. This interface |
| 1836 | * is only safely useable for callers that can track I/O completion by higher |
| 1837 | * level means, e.g. AIL pushing as the @buffer_list is consumed in this |
| 1838 | * function. |
| 1839 | */ |
| 1840 | int |
| 1841 | xfs_buf_delwri_submit_nowait( |
| 1842 | struct list_head *buffer_list) |
| 1843 | { |
| 1844 | LIST_HEAD (io_list); |
| 1845 | return __xfs_buf_delwri_submit(buffer_list, &io_list, false); |
| 1846 | } |
| 1847 | |
| 1848 | /* |
| 1849 | * Write out a buffer list synchronously. |
| 1850 | * |
| 1851 | * This will take the @buffer_list, write all buffers out and wait for I/O |
| 1852 | * completion on all of the buffers. @buffer_list is consumed by the function, |
| 1853 | * so callers must have some other way of tracking buffers if they require such |
| 1854 | * functionality. |
| 1855 | */ |
| 1856 | int |
| 1857 | xfs_buf_delwri_submit( |
| 1858 | struct list_head *buffer_list) |
| 1859 | { |
| 1860 | LIST_HEAD (io_list); |
| 1861 | int error = 0, error2; |
| 1862 | struct xfs_buf *bp; |
| 1863 | |
| 1864 | __xfs_buf_delwri_submit(buffer_list, &io_list, true); |
| 1865 | |
| 1866 | /* Wait for IO to complete. */ |
| 1867 | while (!list_empty(&io_list)) { |
| 1868 | bp = list_first_entry(&io_list, struct xfs_buf, b_list); |
| 1869 | |
| 1870 | list_del_init(&bp->b_list); |
Dave Chinner | cf53e99 | 2014-10-02 09:04:01 +1000 | [diff] [blame] | 1871 | |
| 1872 | /* locking the buffer will wait for async IO completion. */ |
| 1873 | xfs_buf_lock(bp); |
| 1874 | error2 = bp->b_error; |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1875 | xfs_buf_relse(bp); |
| 1876 | if (!error) |
| 1877 | error = error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | } |
| 1879 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1880 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | } |
| 1882 | |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1883 | int __init |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1884 | xfs_buf_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | { |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1886 | xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", |
| 1887 | KM_ZONE_HWALIGN, NULL); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1888 | if (!xfs_buf_zone) |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1889 | goto out; |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1890 | |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1891 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1893 | out: |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1894 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | } |
| 1896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1898 | xfs_buf_terminate(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1900 | kmem_zone_destroy(xfs_buf_zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | } |