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 | |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 37 | #include "xfs_log_format.h" |
Dave Chinner | 7fd36c4 | 2013-08-12 20:49:32 +1000 | [diff] [blame] | 38 | #include "xfs_trans_resv.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 39 | #include "xfs_sb.h" |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 40 | #include "xfs_ag.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 | |
David Chinner | 7989cb8 | 2007-02-10 18:34:56 +1100 | [diff] [blame] | 47 | static struct workqueue_struct *xfslogd_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 49 | #ifdef XFS_BUF_LOCK_TRACKING |
| 50 | # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid) |
| 51 | # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1) |
| 52 | # define XB_GET_OWNER(bp) ((bp)->b_last_holder) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #else |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 54 | # define XB_SET_OWNER(bp) do { } while (0) |
| 55 | # define XB_CLEAR_OWNER(bp) do { } while (0) |
| 56 | # define XB_GET_OWNER(bp) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #endif |
| 58 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 59 | #define xb_to_gfp(flags) \ |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 60 | ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : GFP_NOFS) | __GFP_NOWARN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 63 | static inline int |
| 64 | xfs_buf_is_vmapped( |
| 65 | struct xfs_buf *bp) |
| 66 | { |
| 67 | /* |
| 68 | * Return true if the buffer is vmapped. |
| 69 | * |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 70 | * b_addr is null if the buffer is not mapped, but the code is clever |
| 71 | * enough to know it doesn't have to map a single page, so the check has |
| 72 | * to be both for b_addr and bp->b_page_count > 1. |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 73 | */ |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 74 | return bp->b_addr && bp->b_page_count > 1; |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | static inline int |
| 78 | xfs_buf_vmap_len( |
| 79 | struct xfs_buf *bp) |
| 80 | { |
| 81 | return (bp->b_page_count * PAGE_SIZE) - bp->b_offset; |
| 82 | } |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | /* |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 85 | * When we mark a buffer stale, we remove the buffer from the LRU and clear the |
| 86 | * b_lru_ref count so that the buffer is freed immediately when the buffer |
| 87 | * reference count falls to zero. If the buffer is already on the LRU, we need |
| 88 | * to remove the reference that LRU holds on the buffer. |
| 89 | * |
| 90 | * This prevents build-up of stale buffers on the LRU. |
| 91 | */ |
| 92 | void |
| 93 | xfs_buf_stale( |
| 94 | struct xfs_buf *bp) |
| 95 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 96 | ASSERT(xfs_buf_islocked(bp)); |
| 97 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 98 | bp->b_flags |= XBF_STALE; |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 99 | |
| 100 | /* |
| 101 | * Clear the delwri status so that a delwri queue walker will not |
| 102 | * flush this buffer to disk now that it is stale. The delwri queue has |
| 103 | * a reference to the buffer, so this is safe to do. |
| 104 | */ |
| 105 | bp->b_flags &= ~_XBF_DELWRI_Q; |
| 106 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 107 | spin_lock(&bp->b_lock); |
| 108 | atomic_set(&bp->b_lru_ref, 0); |
| 109 | if (!(bp->b_state & XFS_BSTATE_DISPOSE) && |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 110 | (list_lru_del(&bp->b_target->bt_lru, &bp->b_lru))) |
| 111 | atomic_dec(&bp->b_hold); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 112 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 113 | ASSERT(atomic_read(&bp->b_hold) >= 1); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 114 | spin_unlock(&bp->b_lock); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 115 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 117 | static int |
| 118 | xfs_buf_get_maps( |
| 119 | struct xfs_buf *bp, |
| 120 | int map_count) |
| 121 | { |
| 122 | ASSERT(bp->b_maps == NULL); |
| 123 | bp->b_map_count = map_count; |
| 124 | |
| 125 | if (map_count == 1) { |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 126 | bp->b_maps = &bp->__b_map; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | bp->b_maps = kmem_zalloc(map_count * sizeof(struct xfs_buf_map), |
| 131 | KM_NOFS); |
| 132 | if (!bp->b_maps) |
| 133 | return ENOMEM; |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Frees b_pages if it was allocated. |
| 139 | */ |
| 140 | static void |
| 141 | xfs_buf_free_maps( |
| 142 | struct xfs_buf *bp) |
| 143 | { |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 144 | if (bp->b_maps != &bp->__b_map) { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 145 | kmem_free(bp->b_maps); |
| 146 | bp->b_maps = NULL; |
| 147 | } |
| 148 | } |
| 149 | |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 150 | struct xfs_buf * |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 151 | _xfs_buf_alloc( |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 152 | struct xfs_buftarg *target, |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 153 | struct xfs_buf_map *map, |
| 154 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 155 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 157 | struct xfs_buf *bp; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 158 | int error; |
| 159 | int i; |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 160 | |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 161 | bp = kmem_zone_zalloc(xfs_buf_zone, KM_NOFS); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 162 | if (unlikely(!bp)) |
| 163 | return NULL; |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* |
Dave Chinner | 12bcb3f | 2012-04-23 15:59:05 +1000 | [diff] [blame] | 166 | * We don't want certain flags to appear in b_flags unless they are |
| 167 | * specifically set by later operations on the buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | */ |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 169 | flags &= ~(XBF_UNMAPPED | XBF_TRYLOCK | XBF_ASYNC | XBF_READ_AHEAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 171 | atomic_set(&bp->b_hold, 1); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 172 | atomic_set(&bp->b_lru_ref, 1); |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 173 | init_completion(&bp->b_iowait); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 174 | INIT_LIST_HEAD(&bp->b_lru); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 175 | INIT_LIST_HEAD(&bp->b_list); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 176 | RB_CLEAR_NODE(&bp->b_rbnode); |
Thomas Gleixner | a731cd1 | 2010-09-07 14:33:15 +0000 | [diff] [blame] | 177 | sema_init(&bp->b_sema, 0); /* held, no waiters */ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 178 | spin_lock_init(&bp->b_lock); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 179 | XB_SET_OWNER(bp); |
| 180 | bp->b_target = target; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 181 | bp->b_flags = flags; |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | /* |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 184 | * Set length and io_length to the same value initially. |
| 185 | * 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] | 186 | * most cases but may be reset (e.g. XFS recovery). |
| 187 | */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 188 | error = xfs_buf_get_maps(bp, nmaps); |
| 189 | if (error) { |
| 190 | kmem_zone_free(xfs_buf_zone, bp); |
| 191 | return NULL; |
| 192 | } |
| 193 | |
| 194 | bp->b_bn = map[0].bm_bn; |
| 195 | bp->b_length = 0; |
| 196 | for (i = 0; i < nmaps; i++) { |
| 197 | bp->b_maps[i].bm_bn = map[i].bm_bn; |
| 198 | bp->b_maps[i].bm_len = map[i].bm_len; |
| 199 | bp->b_length += map[i].bm_len; |
| 200 | } |
| 201 | bp->b_io_length = bp->b_length; |
| 202 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 203 | atomic_set(&bp->b_pin_count, 0); |
| 204 | init_waitqueue_head(&bp->b_waiters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 206 | XFS_STATS_INC(xb_create); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 207 | trace_xfs_buf_init(bp, _RET_IP_); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 208 | |
| 209 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 213 | * Allocate a page array capable of holding a specified number |
| 214 | * of pages, and point the page buf at it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | */ |
| 216 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 217 | _xfs_buf_get_pages( |
| 218 | xfs_buf_t *bp, |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 219 | int page_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
| 221 | /* Make sure that we have a page list */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 222 | if (bp->b_pages == NULL) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 223 | bp->b_page_count = page_count; |
| 224 | if (page_count <= XB_PAGES) { |
| 225 | bp->b_pages = bp->b_page_array; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 227 | bp->b_pages = kmem_alloc(sizeof(struct page *) * |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 228 | page_count, KM_NOFS); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 229 | if (bp->b_pages == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | return -ENOMEM; |
| 231 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 232 | memset(bp->b_pages, 0, sizeof(struct page *) * page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 238 | * Frees b_pages if it was allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | */ |
| 240 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 241 | _xfs_buf_free_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | xfs_buf_t *bp) |
| 243 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 244 | if (bp->b_pages != bp->b_page_array) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 245 | kmem_free(bp->b_pages); |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 246 | bp->b_pages = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Releases the specified buffer. |
| 252 | * |
| 253 | * The modification state of any associated pages is left unchanged. |
Zhi Yong Wu | b46fe82 | 2013-08-07 10:10:59 +0000 | [diff] [blame] | 254 | * 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] | 255 | * hashed and refcounted buffers |
| 256 | */ |
| 257 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 258 | xfs_buf_free( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | xfs_buf_t *bp) |
| 260 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 261 | trace_xfs_buf_free(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 263 | ASSERT(list_empty(&bp->b_lru)); |
| 264 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 265 | if (bp->b_flags & _XBF_PAGES) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | uint i; |
| 267 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 268 | if (xfs_buf_is_vmapped(bp)) |
Alex Elder | 8a262e5 | 2010-03-16 18:55:56 +0000 | [diff] [blame] | 269 | vm_unmap_ram(bp->b_addr - bp->b_offset, |
| 270 | bp->b_page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 272 | for (i = 0; i < bp->b_page_count; i++) { |
| 273 | struct page *page = bp->b_pages[i]; |
| 274 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 275 | __free_page(page); |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 276 | } |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 277 | } else if (bp->b_flags & _XBF_KMEM) |
| 278 | kmem_free(bp->b_addr); |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 279 | _xfs_buf_free_pages(bp); |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 280 | xfs_buf_free_maps(bp); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 281 | kmem_zone_free(xfs_buf_zone, bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 285 | * 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] | 286 | */ |
| 287 | STATIC int |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 288 | xfs_buf_allocate_memory( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | xfs_buf_t *bp, |
| 290 | uint flags) |
| 291 | { |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 292 | size_t size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | size_t nbytes, offset; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 294 | gfp_t gfp_mask = xb_to_gfp(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | unsigned short page_count, i; |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 296 | xfs_off_t start, end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | int error; |
| 298 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 299 | /* |
| 300 | * for buffers that are contained within a single page, just allocate |
| 301 | * the memory from the heap - there's no need for the complexity of |
| 302 | * page arrays to keep allocation down to order 0. |
| 303 | */ |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 304 | size = BBTOB(bp->b_length); |
| 305 | if (size < PAGE_SIZE) { |
Dave Chinner | aa5c158 | 2012-04-23 15:58:56 +1000 | [diff] [blame] | 306 | bp->b_addr = kmem_alloc(size, KM_NOFS); |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 307 | if (!bp->b_addr) { |
| 308 | /* low memory - use alloc_page loop instead */ |
| 309 | goto use_alloc_page; |
| 310 | } |
| 311 | |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 312 | if (((unsigned long)(bp->b_addr + size - 1) & PAGE_MASK) != |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 313 | ((unsigned long)bp->b_addr & PAGE_MASK)) { |
| 314 | /* b_addr spans two pages - use alloc_page instead */ |
| 315 | kmem_free(bp->b_addr); |
| 316 | bp->b_addr = NULL; |
| 317 | goto use_alloc_page; |
| 318 | } |
| 319 | bp->b_offset = offset_in_page(bp->b_addr); |
| 320 | bp->b_pages = bp->b_page_array; |
| 321 | bp->b_pages[0] = virt_to_page(bp->b_addr); |
| 322 | bp->b_page_count = 1; |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 323 | bp->b_flags |= _XBF_KMEM; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | use_alloc_page: |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 328 | start = BBTOB(bp->b_maps[0].bm_bn) >> PAGE_SHIFT; |
| 329 | 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] | 330 | >> PAGE_SHIFT; |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 331 | page_count = end - start; |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 332 | error = _xfs_buf_get_pages(bp, page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | if (unlikely(error)) |
| 334 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 336 | offset = bp->b_offset; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 337 | bp->b_flags |= _XBF_PAGES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 339 | for (i = 0; i < bp->b_page_count; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | struct page *page; |
| 341 | uint retries = 0; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 342 | retry: |
| 343 | page = alloc_page(gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (unlikely(page == NULL)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 345 | if (flags & XBF_READ_AHEAD) { |
| 346 | bp->b_page_count = i; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 347 | error = ENOMEM; |
| 348 | goto out_free_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | /* |
| 352 | * This could deadlock. |
| 353 | * |
| 354 | * But until all the XFS lowlevel code is revamped to |
| 355 | * handle buffer allocation failures we can't do much. |
| 356 | */ |
| 357 | if (!(++retries % 100)) |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 358 | xfs_err(NULL, |
| 359 | "possible memory allocation deadlock in %s (mode:0x%x)", |
Harvey Harrison | 34a622b | 2008-04-10 12:19:21 +1000 | [diff] [blame] | 360 | __func__, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 362 | XFS_STATS_INC(xb_page_retries); |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 363 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | goto retry; |
| 365 | } |
| 366 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 367 | XFS_STATS_INC(xb_page_found); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 369 | nbytes = min_t(size_t, size, PAGE_SIZE - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | size -= nbytes; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 371 | bp->b_pages[i] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | offset = 0; |
| 373 | } |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 374 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 376 | out_free_pages: |
| 377 | for (i = 0; i < bp->b_page_count; i++) |
| 378 | __free_page(bp->b_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return error; |
| 380 | } |
| 381 | |
| 382 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 383 | * Map buffer into kernel address-space if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | */ |
| 385 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 386 | _xfs_buf_map_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | xfs_buf_t *bp, |
| 388 | uint flags) |
| 389 | { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 390 | ASSERT(bp->b_flags & _XBF_PAGES); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 391 | if (bp->b_page_count == 1) { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 392 | /* A single page buffer is always mappable */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 393 | bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 394 | } else if (flags & XBF_UNMAPPED) { |
| 395 | bp->b_addr = NULL; |
| 396 | } else { |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 397 | int retried = 0; |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 398 | unsigned noio_flag; |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 399 | |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 400 | /* |
| 401 | * vm_map_ram() will allocate auxillary structures (e.g. |
| 402 | * pagetables) with GFP_KERNEL, yet we are likely to be under |
| 403 | * GFP_NOFS context here. Hence we need to tell memory reclaim |
| 404 | * that we are in such a context via PF_MEMALLOC_NOIO to prevent |
| 405 | * memory reclaim re-entering the filesystem here and |
| 406 | * potentially deadlocking. |
| 407 | */ |
| 408 | noio_flag = memalloc_noio_save(); |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 409 | do { |
| 410 | bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, |
| 411 | -1, PAGE_KERNEL); |
| 412 | if (bp->b_addr) |
| 413 | break; |
| 414 | vm_unmap_aliases(); |
| 415 | } while (retried++ <= 1); |
Dave Chinner | ae687e5 | 2014-03-07 16:19:14 +1100 | [diff] [blame] | 416 | memalloc_noio_restore(noio_flag); |
Dave Chinner | a19fb38 | 2011-03-26 09:13:42 +1100 | [diff] [blame] | 417 | |
| 418 | if (!bp->b_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return -ENOMEM; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 420 | bp->b_addr += bp->b_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Finding and Reading Buffers |
| 428 | */ |
| 429 | |
| 430 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 431 | * Look up, and creates if absent, a lockable buffer for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | * a given range of an inode. The buffer is returned |
Chandra Seetharaman | eabbaf1 | 2011-09-08 20:18:50 +0000 | [diff] [blame] | 433 | * locked. No I/O is implied by this call. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | */ |
| 435 | xfs_buf_t * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 436 | _xfs_buf_find( |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 437 | struct xfs_buftarg *btp, |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 438 | struct xfs_buf_map *map, |
| 439 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 440 | xfs_buf_flags_t flags, |
| 441 | xfs_buf_t *new_bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 443 | size_t numbytes; |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 444 | struct xfs_perag *pag; |
| 445 | struct rb_node **rbp; |
| 446 | struct rb_node *parent; |
| 447 | xfs_buf_t *bp; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 448 | xfs_daddr_t blkno = map[0].bm_bn; |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 449 | xfs_daddr_t eofs; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 450 | int numblks = 0; |
| 451 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 453 | for (i = 0; i < nmaps; i++) |
| 454 | numblks += map[i].bm_len; |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 455 | numbytes = BBTOB(numblks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | /* Check for IOs smaller than the sector size / not sector aligned */ |
Eric Sandeen | 6da5417 | 2014-01-21 16:45:52 -0600 | [diff] [blame] | 458 | ASSERT(!(numbytes < btp->bt_meta_sectorsize)); |
| 459 | ASSERT(!(BBTOB(blkno) & (xfs_off_t)btp->bt_meta_sectormask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 461 | /* |
| 462 | * Corrupted block numbers can get through to here, unfortunately, so we |
| 463 | * have to check that the buffer falls within the filesystem bounds. |
| 464 | */ |
| 465 | eofs = XFS_FSB_TO_BB(btp->bt_mount, btp->bt_mount->m_sb.sb_dblocks); |
| 466 | if (blkno >= eofs) { |
| 467 | /* |
| 468 | * XXX (dgc): we should really be returning EFSCORRUPTED here, |
| 469 | * but none of the higher level infrastructure supports |
| 470 | * returning a specific error on buffer lookup failures. |
| 471 | */ |
| 472 | xfs_alert(btp->bt_mount, |
| 473 | "%s: Block out of range: block 0x%llx, EOFS 0x%llx ", |
| 474 | __func__, blkno, eofs); |
Dave Chinner | 7bc0dc2 | 2013-05-21 18:02:08 +1000 | [diff] [blame] | 475 | WARN_ON(1); |
Dave Chinner | 10616b8 | 2013-01-21 23:53:52 +1100 | [diff] [blame] | 476 | return NULL; |
| 477 | } |
| 478 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 479 | /* get tree root */ |
| 480 | pag = xfs_perag_get(btp->bt_mount, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 481 | xfs_daddr_to_agno(btp->bt_mount, blkno)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 483 | /* walk tree */ |
| 484 | spin_lock(&pag->pag_buf_lock); |
| 485 | rbp = &pag->pag_buf_tree.rb_node; |
| 486 | parent = NULL; |
| 487 | bp = NULL; |
| 488 | while (*rbp) { |
| 489 | parent = *rbp; |
| 490 | bp = rb_entry(parent, struct xfs_buf, b_rbnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 492 | if (blkno < bp->b_bn) |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 493 | rbp = &(*rbp)->rb_left; |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 494 | else if (blkno > bp->b_bn) |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 495 | rbp = &(*rbp)->rb_right; |
| 496 | else { |
| 497 | /* |
Dave Chinner | de1cbee | 2012-04-23 15:58:50 +1000 | [diff] [blame] | 498 | * found a block number match. If the range doesn't |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 499 | * match, the only way this is allowed is if the buffer |
| 500 | * in the cache is stale and the transaction that made |
| 501 | * it stale has not yet committed. i.e. we are |
| 502 | * reallocating a busy extent. Skip this buffer and |
| 503 | * continue searching to the right for an exact match. |
| 504 | */ |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 505 | if (bp->b_length != numblks) { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 506 | ASSERT(bp->b_flags & XBF_STALE); |
| 507 | rbp = &(*rbp)->rb_right; |
| 508 | continue; |
| 509 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 510 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | goto found; |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | /* No match found */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 516 | if (new_bp) { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 517 | rb_link_node(&new_bp->b_rbnode, parent, rbp); |
| 518 | rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree); |
| 519 | /* the buffer keeps the perag reference until it is freed */ |
| 520 | new_bp->b_pag = pag; |
| 521 | spin_unlock(&pag->pag_buf_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 523 | XFS_STATS_INC(xb_miss_locked); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 524 | spin_unlock(&pag->pag_buf_lock); |
| 525 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 527 | return new_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
| 529 | found: |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 530 | spin_unlock(&pag->pag_buf_lock); |
| 531 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 533 | if (!xfs_buf_trylock(bp)) { |
| 534 | if (flags & XBF_TRYLOCK) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 535 | xfs_buf_rele(bp); |
| 536 | XFS_STATS_INC(xb_busy_locked); |
| 537 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 539 | xfs_buf_lock(bp); |
| 540 | XFS_STATS_INC(xb_get_locked_waited); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 543 | /* |
| 544 | * if the buffer is stale, clear all the external state associated with |
| 545 | * it. We need to keep flags such as how we allocated the buffer memory |
| 546 | * intact here. |
| 547 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 548 | if (bp->b_flags & XBF_STALE) { |
| 549 | ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); |
Dave Chinner | cfb0285 | 2012-11-12 22:54:19 +1100 | [diff] [blame] | 550 | ASSERT(bp->b_iodone == NULL); |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 551 | bp->b_flags &= _XBF_KMEM | _XBF_PAGES; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 552 | bp->b_ops = NULL; |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 553 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 554 | |
| 555 | trace_xfs_buf_find(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 556 | XFS_STATS_INC(xb_get_locked); |
| 557 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | /* |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 561 | * Assembles a buffer covering the specified range. The code is optimised for |
| 562 | * cache hits, as metadata intensive workloads will see 3 orders of magnitude |
| 563 | * more hits than misses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | */ |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 565 | struct xfs_buf * |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 566 | xfs_buf_get_map( |
| 567 | struct xfs_buftarg *target, |
| 568 | struct xfs_buf_map *map, |
| 569 | int nmaps, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 570 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 572 | struct xfs_buf *bp; |
| 573 | struct xfs_buf *new_bp; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 574 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 576 | bp = _xfs_buf_find(target, map, nmaps, flags, NULL); |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 577 | if (likely(bp)) |
| 578 | goto found; |
| 579 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 580 | new_bp = _xfs_buf_alloc(target, map, nmaps, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 581 | if (unlikely(!new_bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | return NULL; |
| 583 | |
Dave Chinner | fe2429b | 2012-04-23 15:58:45 +1000 | [diff] [blame] | 584 | error = xfs_buf_allocate_memory(new_bp, flags); |
| 585 | if (error) { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 586 | xfs_buf_free(new_bp); |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 587 | return NULL; |
| 588 | } |
| 589 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 590 | bp = _xfs_buf_find(target, map, nmaps, flags, new_bp); |
Dave Chinner | fe2429b | 2012-04-23 15:58:45 +1000 | [diff] [blame] | 591 | if (!bp) { |
| 592 | xfs_buf_free(new_bp); |
| 593 | return NULL; |
| 594 | } |
| 595 | |
| 596 | if (bp != new_bp) |
| 597 | xfs_buf_free(new_bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Dave Chinner | 3815832 | 2011-09-30 04:45:02 +0000 | [diff] [blame] | 599 | found: |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 600 | if (!bp->b_addr) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 601 | error = _xfs_buf_map_pages(bp, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | if (unlikely(error)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 603 | xfs_warn(target->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 604 | "%s: failed to map pagesn", __func__); |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 605 | xfs_buf_relse(bp); |
| 606 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | } |
| 609 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 610 | XFS_STATS_INC(xb_get); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 611 | trace_xfs_buf_get(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 612 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 615 | STATIC int |
| 616 | _xfs_buf_read( |
| 617 | xfs_buf_t *bp, |
| 618 | xfs_buf_flags_t flags) |
| 619 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 620 | ASSERT(!(flags & XBF_WRITE)); |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 621 | ASSERT(bp->b_maps[0].bm_bn != XFS_BUF_DADDR_NULL); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 622 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 623 | bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_READ_AHEAD); |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 624 | bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | XBF_READ_AHEAD); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 625 | |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 626 | xfs_buf_iorequest(bp); |
| 627 | if (flags & XBF_ASYNC) |
| 628 | return 0; |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 629 | return xfs_buf_iowait(bp); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 630 | } |
| 631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | xfs_buf_t * |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 633 | xfs_buf_read_map( |
| 634 | struct xfs_buftarg *target, |
| 635 | struct xfs_buf_map *map, |
| 636 | int nmaps, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 637 | xfs_buf_flags_t flags, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 638 | const struct xfs_buf_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | { |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 640 | struct xfs_buf *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 642 | flags |= XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 644 | bp = xfs_buf_get_map(target, map, nmaps, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 645 | if (bp) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 646 | trace_xfs_buf_read(bp, flags, _RET_IP_); |
| 647 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 648 | if (!XFS_BUF_ISDONE(bp)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 649 | XFS_STATS_INC(xb_get_read); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 650 | bp->b_ops = ops; |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 651 | _xfs_buf_read(bp, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 652 | } else if (flags & XBF_ASYNC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | /* |
| 654 | * Read ahead call which is already satisfied, |
| 655 | * drop the buffer |
| 656 | */ |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 657 | xfs_buf_relse(bp); |
| 658 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | /* We do not want read in the flags */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 661 | bp->b_flags &= ~XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | } |
| 664 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 665 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 669 | * If we are not low on memory then do the readahead in a deadlock |
| 670 | * safe manner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | */ |
| 672 | void |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 673 | xfs_buf_readahead_map( |
| 674 | struct xfs_buftarg *target, |
| 675 | struct xfs_buf_map *map, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 676 | int nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 677 | const struct xfs_buf_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 679 | if (bdi_read_congested(target->bt_bdi)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | return; |
| 681 | |
Dave Chinner | 6dde270 | 2012-06-22 18:50:10 +1000 | [diff] [blame] | 682 | xfs_buf_read_map(target, map, nmaps, |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 683 | XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD, ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 686 | /* |
| 687 | * Read an uncached buffer from disk. Allocates and returns a locked |
| 688 | * buffer containing the disk contents or nothing. |
| 689 | */ |
| 690 | struct xfs_buf * |
| 691 | xfs_buf_read_uncached( |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 692 | struct xfs_buftarg *target, |
| 693 | xfs_daddr_t daddr, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 694 | size_t numblks, |
Dave Chinner | c3f8fc7 | 2012-11-12 22:54:01 +1100 | [diff] [blame] | 695 | int flags, |
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 | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 700 | bp = xfs_buf_get_uncached(target, numblks, flags); |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 701 | if (!bp) |
| 702 | return NULL; |
| 703 | |
| 704 | /* set up the buffer for a read IO */ |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 705 | ASSERT(bp->b_map_count == 1); |
| 706 | bp->b_bn = daddr; |
| 707 | bp->b_maps[0].bm_bn = daddr; |
Dave Chinner | cbb7baab | 2012-06-22 18:50:08 +1000 | [diff] [blame] | 708 | bp->b_flags |= XBF_READ; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 709 | bp->b_ops = ops; |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 710 | |
Christoph Hellwig | 83a0adc | 2013-12-17 00:03:52 -0800 | [diff] [blame] | 711 | if (XFS_FORCED_SHUTDOWN(target->bt_mount)) { |
| 712 | xfs_buf_relse(bp); |
| 713 | return NULL; |
| 714 | } |
| 715 | xfs_buf_iorequest(bp); |
Dave Chinner | eab4e63 | 2012-11-12 22:54:02 +1100 | [diff] [blame] | 716 | xfs_buf_iowait(bp); |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 717 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 720 | /* |
| 721 | * Return a buffer allocated as an empty buffer and associated to external |
| 722 | * memory via xfs_buf_associate_memory() back to it's empty state. |
| 723 | */ |
| 724 | void |
| 725 | xfs_buf_set_empty( |
| 726 | struct xfs_buf *bp, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 727 | size_t numblks) |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 728 | { |
| 729 | if (bp->b_pages) |
| 730 | _xfs_buf_free_pages(bp); |
| 731 | |
| 732 | bp->b_pages = NULL; |
| 733 | bp->b_page_count = 0; |
| 734 | bp->b_addr = NULL; |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 735 | bp->b_length = numblks; |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 736 | bp->b_io_length = numblks; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 737 | |
| 738 | ASSERT(bp->b_map_count == 1); |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 739 | bp->b_bn = XFS_BUF_DADDR_NULL; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 740 | bp->b_maps[0].bm_bn = XFS_BUF_DADDR_NULL; |
| 741 | bp->b_maps[0].bm_len = bp->b_length; |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 742 | } |
| 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | static inline struct page * |
| 745 | mem_to_page( |
| 746 | void *addr) |
| 747 | { |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 748 | if ((!is_vmalloc_addr(addr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | return virt_to_page(addr); |
| 750 | } else { |
| 751 | return vmalloc_to_page(addr); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 756 | xfs_buf_associate_memory( |
| 757 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | void *mem, |
| 759 | size_t len) |
| 760 | { |
| 761 | int rval; |
| 762 | int i = 0; |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 763 | unsigned long pageaddr; |
| 764 | unsigned long offset; |
| 765 | size_t buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | int page_count; |
| 767 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 768 | pageaddr = (unsigned long)mem & PAGE_MASK; |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 769 | offset = (unsigned long)mem - pageaddr; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 770 | buflen = PAGE_ALIGN(len + offset); |
| 771 | page_count = buflen >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
| 773 | /* Free any previous set of page pointers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 774 | if (bp->b_pages) |
| 775 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 777 | bp->b_pages = NULL; |
| 778 | bp->b_addr = mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 780 | rval = _xfs_buf_get_pages(bp, page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | if (rval) |
| 782 | return rval; |
| 783 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 784 | bp->b_offset = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 786 | for (i = 0; i < bp->b_page_count; i++) { |
| 787 | bp->b_pages[i] = mem_to_page((void *)pageaddr); |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 788 | pageaddr += PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 791 | bp->b_io_length = BTOBB(len); |
Dave Chinner | 4e94b71 | 2012-04-23 15:58:51 +1000 | [diff] [blame] | 792 | bp->b_length = BTOBB(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | return 0; |
| 795 | } |
| 796 | |
| 797 | xfs_buf_t * |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 798 | xfs_buf_get_uncached( |
| 799 | struct xfs_buftarg *target, |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 800 | size_t numblks, |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 801 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 803 | unsigned long page_count; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 804 | int error, i; |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 805 | struct xfs_buf *bp; |
| 806 | DEFINE_SINGLE_BUF_MAP(map, XFS_BUF_DADDR_NULL, numblks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 808 | bp = _xfs_buf_alloc(target, &map, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | if (unlikely(bp == NULL)) |
| 810 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
Dave Chinner | e70b73f | 2012-04-23 15:58:49 +1000 | [diff] [blame] | 812 | page_count = PAGE_ALIGN(numblks << BBSHIFT) >> PAGE_SHIFT; |
Eric Sandeen | 87937bf | 2014-04-14 19:01:20 +1000 | [diff] [blame] | 813 | error = _xfs_buf_get_pages(bp, page_count); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 814 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | goto fail_free_buf; |
| 816 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 817 | for (i = 0; i < page_count; i++) { |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 818 | bp->b_pages[i] = alloc_page(xb_to_gfp(flags)); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 819 | if (!bp->b_pages[i]) |
| 820 | goto fail_free_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 822 | bp->b_flags |= _XBF_PAGES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 824 | error = _xfs_buf_map_pages(bp, 0); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 825 | if (unlikely(error)) { |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 826 | xfs_warn(target->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 827 | "%s: failed to map pages", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | goto fail_free_mem; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 831 | trace_xfs_buf_get_uncached(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | return bp; |
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 | fail_free_mem: |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 835 | while (--i >= 0) |
| 836 | __free_page(bp->b_pages[i]); |
Christoph Hellwig | ca165b8 | 2007-05-24 15:21:11 +1000 | [diff] [blame] | 837 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | fail_free_buf: |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 839 | xfs_buf_free_maps(bp); |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 840 | kmem_zone_free(xfs_buf_zone, bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | fail: |
| 842 | return NULL; |
| 843 | } |
| 844 | |
| 845 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | * Increment reference count on buffer, to hold the buffer concurrently |
| 847 | * with another thread which may release (free) the buffer asynchronously. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | * Must hold the buffer already to call this function. |
| 849 | */ |
| 850 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 851 | xfs_buf_hold( |
| 852 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 854 | trace_xfs_buf_hold(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 855 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 859 | * Releases a hold on the specified buffer. If the |
| 860 | * the hold count is 1, calls xfs_buf_free. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | */ |
| 862 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 863 | xfs_buf_rele( |
| 864 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 866 | struct xfs_perag *pag = bp->b_pag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 868 | trace_xfs_buf_rele(bp, _RET_IP_); |
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 | if (!pag) { |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 871 | ASSERT(list_empty(&bp->b_lru)); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 872 | ASSERT(RB_EMPTY_NODE(&bp->b_rbnode)); |
Nathan Scott | fad3aa1 | 2006-02-01 12:14:52 +1100 | [diff] [blame] | 873 | if (atomic_dec_and_test(&bp->b_hold)) |
| 874 | xfs_buf_free(bp); |
| 875 | return; |
| 876 | } |
| 877 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 878 | ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode)); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 879 | |
Lachlan McIlroy | 3790689 | 2008-08-13 15:42:10 +1000 | [diff] [blame] | 880 | ASSERT(atomic_read(&bp->b_hold) > 0); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 881 | if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 882 | spin_lock(&bp->b_lock); |
| 883 | if (!(bp->b_flags & XBF_STALE) && atomic_read(&bp->b_lru_ref)) { |
| 884 | /* |
| 885 | * If the buffer is added to the LRU take a new |
| 886 | * reference to the buffer for the LRU and clear the |
| 887 | * (now stale) dispose list state flag |
| 888 | */ |
| 889 | if (list_lru_add(&bp->b_target->bt_lru, &bp->b_lru)) { |
| 890 | bp->b_state &= ~XFS_BSTATE_DISPOSE; |
| 891 | atomic_inc(&bp->b_hold); |
| 892 | } |
| 893 | spin_unlock(&bp->b_lock); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 894 | spin_unlock(&pag->pag_buf_lock); |
Christoph Hellwig | 7f14d0a | 2005-11-02 15:09:35 +1100 | [diff] [blame] | 895 | } else { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 896 | /* |
| 897 | * most of the time buffers will already be removed from |
| 898 | * the LRU, so optimise that case by checking for the |
| 899 | * XFS_BSTATE_DISPOSE flag indicating the last list the |
| 900 | * buffer was on was the disposal list |
| 901 | */ |
| 902 | if (!(bp->b_state & XFS_BSTATE_DISPOSE)) { |
| 903 | list_lru_del(&bp->b_target->bt_lru, &bp->b_lru); |
| 904 | } else { |
| 905 | ASSERT(list_empty(&bp->b_lru)); |
| 906 | } |
| 907 | spin_unlock(&bp->b_lock); |
| 908 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 909 | ASSERT(!(bp->b_flags & _XBF_DELWRI_Q)); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 910 | rb_erase(&bp->b_rbnode, &pag->pag_buf_tree); |
| 911 | spin_unlock(&pag->pag_buf_lock); |
| 912 | xfs_perag_put(pag); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 913 | xfs_buf_free(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | } |
| 916 | } |
| 917 | |
| 918 | |
| 919 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 920 | * Lock a buffer object, if it is not already locked. |
Dave Chinner | 90810b9 | 2010-11-30 15:16:16 +1100 | [diff] [blame] | 921 | * |
| 922 | * If we come across a stale, pinned, locked buffer, we know that we are |
| 923 | * being asked to lock a buffer that has been reallocated. Because it is |
| 924 | * pinned, we know that the log has not been pushed to disk and hence it |
| 925 | * will still be locked. Rather than continuing to have trylock attempts |
| 926 | * fail until someone else pushes the log, push it ourselves before |
| 927 | * returning. This means that the xfsaild will not get stuck trying |
| 928 | * to push on stale inode buffers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | */ |
| 930 | int |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 931 | xfs_buf_trylock( |
| 932 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | { |
| 934 | int locked; |
| 935 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 936 | locked = down_trylock(&bp->b_sema) == 0; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 937 | if (locked) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 938 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 939 | |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 940 | trace_xfs_buf_trylock(bp, _RET_IP_); |
| 941 | return locked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
| 944 | /* |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 945 | * Lock a buffer object. |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 946 | * |
| 947 | * If we come across a stale, pinned, locked buffer, we know that we |
| 948 | * are being asked to lock a buffer that has been reallocated. Because |
| 949 | * it is pinned, we know that the log has not been pushed to disk and |
| 950 | * hence it will still be locked. Rather than sleeping until someone |
| 951 | * 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] | 952 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 953 | void |
| 954 | xfs_buf_lock( |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 955 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 957 | trace_xfs_buf_lock(bp, _RET_IP_); |
| 958 | |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 959 | if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE)) |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 960 | xfs_log_force(bp->b_target->bt_mount, 0); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 961 | down(&bp->b_sema); |
| 962 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 963 | |
| 964 | trace_xfs_buf_lock_done(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 968 | xfs_buf_unlock( |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 969 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 971 | XB_CLEAR_OWNER(bp); |
| 972 | up(&bp->b_sema); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 973 | |
| 974 | trace_xfs_buf_unlock(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 977 | STATIC void |
| 978 | xfs_buf_wait_unpin( |
| 979 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | { |
| 981 | DECLARE_WAITQUEUE (wait, current); |
| 982 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 983 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | return; |
| 985 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 986 | add_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | for (;;) { |
| 988 | set_current_state(TASK_UNINTERRUPTIBLE); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 989 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | break; |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 991 | io_schedule(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 993 | remove_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | set_current_state(TASK_RUNNING); |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Buffer Utility Routines |
| 999 | */ |
| 1000 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1002 | xfs_buf_iodone_work( |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1003 | struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1005 | struct xfs_buf *bp = |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1006 | container_of(work, xfs_buf_t, b_iodone_work); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1007 | bool read = !!(bp->b_flags & XBF_READ); |
| 1008 | |
| 1009 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
Dave Chinner | d5929de | 2013-02-27 13:25:54 +1100 | [diff] [blame] | 1010 | |
| 1011 | /* only validate buffers that were read without errors */ |
| 1012 | if (read && bp->b_ops && !bp->b_error && (bp->b_flags & XBF_DONE)) |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1013 | bp->b_ops->verify_read(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Christoph Hellwig | 80f6c29 | 2010-08-18 05:29:11 -0400 | [diff] [blame] | 1015 | if (bp->b_iodone) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1016 | (*(bp->b_iodone))(bp); |
| 1017 | else if (bp->b_flags & XBF_ASYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | xfs_buf_relse(bp); |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1019 | else { |
| 1020 | ASSERT(read && bp->b_ops); |
| 1021 | complete(&bp->b_iowait); |
| 1022 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | } |
| 1024 | |
| 1025 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1026 | xfs_buf_ioend( |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1027 | struct xfs_buf *bp, |
| 1028 | int schedule) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | { |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1030 | bool read = !!(bp->b_flags & XBF_READ); |
| 1031 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1032 | trace_xfs_buf_iodone(bp, _RET_IP_); |
| 1033 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1034 | if (bp->b_error == 0) |
| 1035 | bp->b_flags |= XBF_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1037 | if (bp->b_iodone || (read && bp->b_ops) || (bp->b_flags & XBF_ASYNC)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | if (schedule) { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1039 | INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1040 | queue_work(xfslogd_workqueue, &bp->b_iodone_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | } else { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1042 | xfs_buf_iodone_work(&bp->b_iodone_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | } |
| 1044 | } else { |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1045 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 1046 | complete(&bp->b_iowait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | } |
| 1048 | } |
| 1049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1051 | xfs_buf_ioerror( |
| 1052 | xfs_buf_t *bp, |
| 1053 | int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | { |
| 1055 | ASSERT(error >= 0 && error <= 0xffff); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1056 | bp->b_error = (unsigned short)error; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1057 | trace_xfs_buf_ioerror(bp, error, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | } |
| 1059 | |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 1060 | void |
| 1061 | xfs_buf_ioerror_alert( |
| 1062 | struct xfs_buf *bp, |
| 1063 | const char *func) |
| 1064 | { |
| 1065 | xfs_alert(bp->b_target->bt_mount, |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 1066 | "metadata I/O error: block 0x%llx (\"%s\") error %d numblks %d", |
| 1067 | (__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] | 1068 | } |
| 1069 | |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1070 | /* |
| 1071 | * Called when we want to stop a buffer from getting written or read. |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1072 | * We attach the EIO error, muck with its flags, and call xfs_buf_ioend |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1073 | * so that the proper iodone callbacks get called. |
| 1074 | */ |
| 1075 | STATIC int |
| 1076 | xfs_bioerror( |
| 1077 | xfs_buf_t *bp) |
| 1078 | { |
| 1079 | #ifdef XFSERRORDEBUG |
| 1080 | ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone); |
| 1081 | #endif |
| 1082 | |
| 1083 | /* |
| 1084 | * No need to wait until the buffer is unpinned, we aren't flushing it. |
| 1085 | */ |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 1086 | xfs_buf_ioerror(bp, EIO); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1087 | |
| 1088 | /* |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1089 | * We're calling xfs_buf_ioend, so delete XBF_DONE flag. |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1090 | */ |
| 1091 | XFS_BUF_UNREAD(bp); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1092 | XFS_BUF_UNDONE(bp); |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 1093 | xfs_buf_stale(bp); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1094 | |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1095 | xfs_buf_ioend(bp, 0); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1096 | |
| 1097 | return EIO; |
| 1098 | } |
| 1099 | |
| 1100 | /* |
| 1101 | * Same as xfs_bioerror, except that we are releasing the buffer |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1102 | * here ourselves, and avoiding the xfs_buf_ioend call. |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1103 | * This is meant for userdata errors; metadata bufs come with |
| 1104 | * iodone functions attached, so that we can track down errors. |
| 1105 | */ |
Christoph Hellwig | 83a0adc | 2013-12-17 00:03:52 -0800 | [diff] [blame] | 1106 | int |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1107 | xfs_bioerror_relse( |
| 1108 | struct xfs_buf *bp) |
| 1109 | { |
Chandra Seetharaman | ed43233 | 2011-07-22 23:39:39 +0000 | [diff] [blame] | 1110 | int64_t fl = bp->b_flags; |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1111 | /* |
| 1112 | * No need to wait until the buffer is unpinned. |
| 1113 | * We aren't flushing it. |
| 1114 | * |
| 1115 | * chunkhold expects B_DONE to be set, whether |
| 1116 | * we actually finish the I/O or not. We don't want to |
| 1117 | * change that interface. |
| 1118 | */ |
| 1119 | XFS_BUF_UNREAD(bp); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1120 | XFS_BUF_DONE(bp); |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 1121 | xfs_buf_stale(bp); |
Christoph Hellwig | cb669ca | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1122 | bp->b_iodone = NULL; |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 1123 | if (!(fl & XBF_ASYNC)) { |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1124 | /* |
| 1125 | * Mark b_error and B_ERROR _both_. |
| 1126 | * Lot's of chunkcache code assumes that. |
| 1127 | * There's no reason to mark error for |
| 1128 | * ASYNC buffers. |
| 1129 | */ |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 1130 | xfs_buf_ioerror(bp, EIO); |
Christoph Hellwig | 5fde032 | 2011-10-10 16:52:44 +0000 | [diff] [blame] | 1131 | complete(&bp->b_iowait); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1132 | } else { |
| 1133 | xfs_buf_relse(bp); |
| 1134 | } |
| 1135 | |
| 1136 | return EIO; |
| 1137 | } |
| 1138 | |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1139 | STATIC int |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1140 | xfs_bdstrat_cb( |
| 1141 | struct xfs_buf *bp) |
| 1142 | { |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1143 | if (XFS_FORCED_SHUTDOWN(bp->b_target->bt_mount)) { |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1144 | trace_xfs_bdstrat_shut(bp, _RET_IP_); |
| 1145 | /* |
| 1146 | * Metadata write that didn't get logged but |
| 1147 | * written delayed anyway. These aren't associated |
| 1148 | * with a transaction, and can be ignored. |
| 1149 | */ |
| 1150 | if (!bp->b_iodone && !XFS_BUF_ISREAD(bp)) |
| 1151 | return xfs_bioerror_relse(bp); |
| 1152 | else |
| 1153 | return xfs_bioerror(bp); |
| 1154 | } |
| 1155 | |
| 1156 | xfs_buf_iorequest(bp); |
| 1157 | return 0; |
| 1158 | } |
| 1159 | |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1160 | int |
| 1161 | xfs_bwrite( |
| 1162 | struct xfs_buf *bp) |
| 1163 | { |
| 1164 | int error; |
| 1165 | |
| 1166 | ASSERT(xfs_buf_islocked(bp)); |
| 1167 | |
| 1168 | bp->b_flags |= XBF_WRITE; |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame] | 1169 | bp->b_flags &= ~(XBF_ASYNC | XBF_READ | _XBF_DELWRI_Q | XBF_WRITE_FAIL); |
Christoph Hellwig | a2dcf5d | 2012-07-13 02:24:10 -0400 | [diff] [blame] | 1170 | |
| 1171 | xfs_bdstrat_cb(bp); |
| 1172 | |
| 1173 | error = xfs_buf_iowait(bp); |
| 1174 | if (error) { |
| 1175 | xfs_force_shutdown(bp->b_target->bt_mount, |
| 1176 | SHUTDOWN_META_IO_ERROR); |
| 1177 | } |
| 1178 | return error; |
| 1179 | } |
| 1180 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1181 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1182 | _xfs_buf_ioend( |
| 1183 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | int schedule) |
| 1185 | { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1186 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1187 | xfs_buf_ioend(bp, schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
| 1189 | |
Al Viro | 782e3b3 | 2007-10-12 07:17:47 +0100 | [diff] [blame] | 1190 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1191 | xfs_buf_bio_end_io( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | struct bio *bio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | int error) |
| 1194 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1195 | xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1197 | /* |
| 1198 | * don't overwrite existing errors - otherwise we can lose errors on |
| 1199 | * buffers that require multiple bios to complete. |
| 1200 | */ |
| 1201 | if (!bp->b_error) |
| 1202 | xfs_buf_ioerror(bp, -error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1204 | 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] | 1205 | invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); |
| 1206 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1207 | _xfs_buf_ioend(bp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1211 | static void |
| 1212 | xfs_buf_ioapply_map( |
| 1213 | struct xfs_buf *bp, |
| 1214 | int map, |
| 1215 | int *buf_offset, |
| 1216 | int *count, |
| 1217 | int rw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | { |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1219 | int page_index; |
| 1220 | int total_nr_pages = bp->b_page_count; |
| 1221 | int nr_pages; |
| 1222 | struct bio *bio; |
| 1223 | sector_t sector = bp->b_maps[map].bm_bn; |
| 1224 | int size; |
| 1225 | int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1227 | total_nr_pages = bp->b_page_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1229 | /* skip the pages in the buffer before the start offset */ |
| 1230 | page_index = 0; |
| 1231 | offset = *buf_offset; |
| 1232 | while (offset >= PAGE_SIZE) { |
| 1233 | page_index++; |
| 1234 | offset -= PAGE_SIZE; |
Christoph Hellwig | f538d4d | 2005-11-02 10:26:59 +1100 | [diff] [blame] | 1235 | } |
| 1236 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1237 | /* |
| 1238 | * Limit the IO size to the length of the current vector, and update the |
| 1239 | * remaining IO count for the next time around. |
| 1240 | */ |
| 1241 | size = min_t(int, BBTOB(bp->b_maps[map].bm_len), *count); |
| 1242 | *count -= size; |
| 1243 | *buf_offset += size; |
Christoph Hellwig | 34951f5 | 2011-07-26 15:06:44 +0000 | [diff] [blame] | 1244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | next_chunk: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1246 | atomic_inc(&bp->b_io_remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); |
| 1248 | if (nr_pages > total_nr_pages) |
| 1249 | nr_pages = total_nr_pages; |
| 1250 | |
| 1251 | bio = bio_alloc(GFP_NOIO, nr_pages); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1252 | bio->bi_bdev = bp->b_target->bt_bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1253 | bio->bi_iter.bi_sector = sector; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1254 | bio->bi_end_io = xfs_buf_bio_end_io; |
| 1255 | bio->bi_private = bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1257 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1258 | for (; size && nr_pages; nr_pages--, page_index++) { |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1259 | int rbytes, nbytes = PAGE_SIZE - offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | |
| 1261 | if (nbytes > size) |
| 1262 | nbytes = size; |
| 1263 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1264 | rbytes = bio_add_page(bio, bp->b_pages[page_index], nbytes, |
| 1265 | offset); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1266 | if (rbytes < nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | break; |
| 1268 | |
| 1269 | offset = 0; |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 1270 | sector += BTOBB(nbytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | size -= nbytes; |
| 1272 | total_nr_pages--; |
| 1273 | } |
| 1274 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1275 | if (likely(bio->bi_iter.bi_size)) { |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 1276 | if (xfs_buf_is_vmapped(bp)) { |
| 1277 | flush_kernel_vmap_range(bp->b_addr, |
| 1278 | xfs_buf_vmap_len(bp)); |
| 1279 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | submit_bio(rw, bio); |
| 1281 | if (size) |
| 1282 | goto next_chunk; |
| 1283 | } else { |
Dave Chinner | 37eb17e | 2012-11-12 22:09:46 +1100 | [diff] [blame] | 1284 | /* |
| 1285 | * This is guaranteed not to be the last io reference count |
| 1286 | * because the caller (xfs_buf_iorequest) holds a count itself. |
| 1287 | */ |
| 1288 | atomic_dec(&bp->b_io_remaining); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1289 | xfs_buf_ioerror(bp, EIO); |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 1290 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | } |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1292 | |
| 1293 | } |
| 1294 | |
| 1295 | STATIC void |
| 1296 | _xfs_buf_ioapply( |
| 1297 | struct xfs_buf *bp) |
| 1298 | { |
| 1299 | struct blk_plug plug; |
| 1300 | int rw; |
| 1301 | int offset; |
| 1302 | int size; |
| 1303 | int i; |
| 1304 | |
Dave Chinner | c163f9a | 2013-03-12 23:30:34 +1100 | [diff] [blame] | 1305 | /* |
| 1306 | * Make sure we capture only current IO errors rather than stale errors |
| 1307 | * left over from previous use of the buffer (e.g. failed readahead). |
| 1308 | */ |
| 1309 | bp->b_error = 0; |
| 1310 | |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1311 | if (bp->b_flags & XBF_WRITE) { |
| 1312 | if (bp->b_flags & XBF_SYNCIO) |
| 1313 | rw = WRITE_SYNC; |
| 1314 | else |
| 1315 | rw = WRITE; |
| 1316 | if (bp->b_flags & XBF_FUA) |
| 1317 | rw |= REQ_FUA; |
| 1318 | if (bp->b_flags & XBF_FLUSH) |
| 1319 | rw |= REQ_FLUSH; |
Dave Chinner | 1813dd6 | 2012-11-14 17:54:40 +1100 | [diff] [blame] | 1320 | |
| 1321 | /* |
| 1322 | * Run the write verifier callback function if it exists. If |
| 1323 | * this function fails it will mark the buffer with an error and |
| 1324 | * the IO should not be dispatched. |
| 1325 | */ |
| 1326 | if (bp->b_ops) { |
| 1327 | bp->b_ops->verify_write(bp); |
| 1328 | if (bp->b_error) { |
| 1329 | xfs_force_shutdown(bp->b_target->bt_mount, |
| 1330 | SHUTDOWN_CORRUPT_INCORE); |
| 1331 | return; |
| 1332 | } |
| 1333 | } |
Dave Chinner | 3e85c86 | 2012-06-22 18:50:09 +1000 | [diff] [blame] | 1334 | } else if (bp->b_flags & XBF_READ_AHEAD) { |
| 1335 | rw = READA; |
| 1336 | } else { |
| 1337 | rw = READ; |
| 1338 | } |
| 1339 | |
| 1340 | /* we only use the buffer cache for meta-data */ |
| 1341 | rw |= REQ_META; |
| 1342 | |
| 1343 | /* |
| 1344 | * Walk all the vectors issuing IO on them. Set up the initial offset |
| 1345 | * into the buffer and the desired IO size before we start - |
| 1346 | * _xfs_buf_ioapply_vec() will modify them appropriately for each |
| 1347 | * subsequent call. |
| 1348 | */ |
| 1349 | offset = bp->b_offset; |
| 1350 | size = BBTOB(bp->b_io_length); |
| 1351 | blk_start_plug(&plug); |
| 1352 | for (i = 0; i < bp->b_map_count; i++) { |
| 1353 | xfs_buf_ioapply_map(bp, i, &offset, &size, rw); |
| 1354 | if (bp->b_error) |
| 1355 | break; |
| 1356 | if (size <= 0) |
| 1357 | break; /* all done */ |
| 1358 | } |
| 1359 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | } |
| 1361 | |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 1362 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1363 | xfs_buf_iorequest( |
| 1364 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1366 | trace_xfs_buf_iorequest(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1368 | ASSERT(!(bp->b_flags & _XBF_DELWRI_Q)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
Christoph Hellwig | 375ec69d | 2011-08-23 08:28:03 +0000 | [diff] [blame] | 1370 | if (bp->b_flags & XBF_WRITE) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1371 | xfs_buf_wait_unpin(bp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1372 | xfs_buf_hold(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1374 | /* |
| 1375 | * Set the count to 1 initially, this will stop an I/O |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | * completion callout which happens before we have started |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1377 | * all the I/O from calling xfs_buf_ioend too early. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1379 | atomic_set(&bp->b_io_remaining, 1); |
| 1380 | _xfs_buf_ioapply(bp); |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1381 | /* |
| 1382 | * If _xfs_buf_ioapply failed, we'll get back here with |
| 1383 | * only the reference we took above. _xfs_buf_ioend will |
| 1384 | * drop it to zero, so we'd better not queue it for later, |
| 1385 | * or we'll free it before it's done. |
| 1386 | */ |
| 1387 | _xfs_buf_ioend(bp, bp->b_error ? 0 : 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1389 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | } |
| 1391 | |
| 1392 | /* |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 1393 | * Waits for I/O to complete on the buffer supplied. It returns immediately if |
Eric Sandeen | 8d6c121 | 2014-04-17 08:15:28 +1000 | [diff] [blame] | 1394 | * no I/O is pending or there is already a pending error on the buffer, in which |
| 1395 | * case nothing will ever complete. It returns the I/O error code, if any, or |
| 1396 | * 0 if there was no error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | */ |
| 1398 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1399 | xfs_buf_iowait( |
| 1400 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1402 | trace_xfs_buf_iowait(bp, _RET_IP_); |
| 1403 | |
Dave Chinner | 0e95f19 | 2012-04-23 15:58:46 +1000 | [diff] [blame] | 1404 | if (!bp->b_error) |
| 1405 | wait_for_completion(&bp->b_iowait); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1406 | |
| 1407 | trace_xfs_buf_iowait_done(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1408 | return bp->b_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | } |
| 1410 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1411 | xfs_caddr_t |
| 1412 | xfs_buf_offset( |
| 1413 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | size_t offset) |
| 1415 | { |
| 1416 | struct page *page; |
| 1417 | |
Dave Chinner | 611c994 | 2012-04-23 15:59:07 +1000 | [diff] [blame] | 1418 | if (bp->b_addr) |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 1419 | return bp->b_addr + offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1421 | offset += bp->b_offset; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1422 | page = bp->b_pages[offset >> PAGE_SHIFT]; |
| 1423 | return (xfs_caddr_t)page_address(page) + (offset & (PAGE_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } |
| 1425 | |
| 1426 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | * Move data into or out of a buffer. |
| 1428 | */ |
| 1429 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1430 | xfs_buf_iomove( |
| 1431 | xfs_buf_t *bp, /* buffer to process */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | size_t boff, /* starting buffer offset */ |
| 1433 | size_t bsize, /* length to copy */ |
Dave Chinner | b9c4864 | 2010-01-20 10:47:39 +1100 | [diff] [blame] | 1434 | void *data, /* data address */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1435 | xfs_buf_rw_t mode) /* read/write/zero flag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | { |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1437 | size_t bend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | |
| 1439 | bend = boff + bsize; |
| 1440 | while (boff < bend) { |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1441 | struct page *page; |
| 1442 | int page_index, page_offset, csize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1444 | page_index = (boff + bp->b_offset) >> PAGE_SHIFT; |
| 1445 | page_offset = (boff + bp->b_offset) & ~PAGE_MASK; |
| 1446 | page = bp->b_pages[page_index]; |
| 1447 | csize = min_t(size_t, PAGE_SIZE - page_offset, |
| 1448 | BBTOB(bp->b_io_length) - boff); |
| 1449 | |
| 1450 | ASSERT((csize + page_offset) <= PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | |
| 1452 | switch (mode) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1453 | case XBRW_ZERO: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1454 | memset(page_address(page) + page_offset, 0, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1456 | case XBRW_READ: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1457 | memcpy(data, page_address(page) + page_offset, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1459 | case XBRW_WRITE: |
Dave Chinner | 795cac7 | 2012-04-23 15:58:53 +1000 | [diff] [blame] | 1460 | memcpy(page_address(page) + page_offset, data, csize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | } |
| 1462 | |
| 1463 | boff += csize; |
| 1464 | data += csize; |
| 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1469 | * Handling of buffer targets (buftargs). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | */ |
| 1471 | |
| 1472 | /* |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1473 | * Wait for any bufs with callbacks that have been submitted but have not yet |
| 1474 | * returned. These buffers will have an elevated hold count, so wait on those |
| 1475 | * while freeing all the buffers only held by the LRU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | */ |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1477 | static enum lru_status |
| 1478 | xfs_buftarg_wait_rele( |
| 1479 | struct list_head *item, |
| 1480 | spinlock_t *lru_lock, |
| 1481 | void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1483 | { |
| 1484 | struct xfs_buf *bp = container_of(item, struct xfs_buf, b_lru); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1485 | struct list_head *dispose = arg; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1486 | |
| 1487 | if (atomic_read(&bp->b_hold) > 1) { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1488 | /* need to wait, so skip it this pass */ |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1489 | trace_xfs_buf_wait_buftarg(bp, _RET_IP_); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1490 | return LRU_SKIP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | } |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1492 | if (!spin_trylock(&bp->b_lock)) |
| 1493 | return LRU_SKIP; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1494 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1495 | /* |
| 1496 | * clear the LRU reference count so the buffer doesn't get |
| 1497 | * ignored in xfs_buf_rele(). |
| 1498 | */ |
| 1499 | atomic_set(&bp->b_lru_ref, 0); |
| 1500 | bp->b_state |= XFS_BSTATE_DISPOSE; |
| 1501 | list_move(item, dispose); |
| 1502 | spin_unlock(&bp->b_lock); |
| 1503 | return LRU_REMOVED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | } |
| 1505 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1506 | void |
| 1507 | xfs_wait_buftarg( |
| 1508 | struct xfs_buftarg *btp) |
| 1509 | { |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1510 | LIST_HEAD(dispose); |
| 1511 | int loop = 0; |
| 1512 | |
| 1513 | /* loop until there is nothing left on the lru list. */ |
| 1514 | while (list_lru_count(&btp->bt_lru)) { |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1515 | list_lru_walk(&btp->bt_lru, xfs_buftarg_wait_rele, |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1516 | &dispose, LONG_MAX); |
| 1517 | |
| 1518 | while (!list_empty(&dispose)) { |
| 1519 | struct xfs_buf *bp; |
| 1520 | bp = list_first_entry(&dispose, struct xfs_buf, b_lru); |
| 1521 | list_del_init(&bp->b_lru); |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame] | 1522 | if (bp->b_flags & XBF_WRITE_FAIL) { |
| 1523 | xfs_alert(btp->bt_mount, |
| 1524 | "Corruption Alert: Buffer at block 0x%llx had permanent write failures!\n" |
| 1525 | "Please run xfs_repair to determine the extent of the problem.", |
| 1526 | (long long)bp->b_bn); |
| 1527 | } |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1528 | xfs_buf_rele(bp); |
| 1529 | } |
| 1530 | if (loop++ != 0) |
| 1531 | delay(100); |
| 1532 | } |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1533 | } |
| 1534 | |
| 1535 | static enum lru_status |
| 1536 | xfs_buftarg_isolate( |
| 1537 | struct list_head *item, |
| 1538 | spinlock_t *lru_lock, |
| 1539 | void *arg) |
| 1540 | { |
| 1541 | struct xfs_buf *bp = container_of(item, struct xfs_buf, b_lru); |
| 1542 | struct list_head *dispose = arg; |
| 1543 | |
| 1544 | /* |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1545 | * we are inverting the lru lock/bp->b_lock here, so use a trylock. |
| 1546 | * If we fail to get the lock, just skip it. |
| 1547 | */ |
| 1548 | if (!spin_trylock(&bp->b_lock)) |
| 1549 | return LRU_SKIP; |
| 1550 | /* |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1551 | * Decrement the b_lru_ref count unless the value is already |
| 1552 | * zero. If the value is already zero, we need to reclaim the |
| 1553 | * buffer, otherwise it gets another trip through the LRU. |
| 1554 | */ |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1555 | if (!atomic_add_unless(&bp->b_lru_ref, -1, 0)) { |
| 1556 | spin_unlock(&bp->b_lock); |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1557 | return LRU_ROTATE; |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1558 | } |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1559 | |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1560 | bp->b_state |= XFS_BSTATE_DISPOSE; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1561 | list_move(item, dispose); |
Dave Chinner | a408235 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1562 | spin_unlock(&bp->b_lock); |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1563 | return LRU_REMOVED; |
| 1564 | } |
| 1565 | |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1566 | static unsigned long |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1567 | xfs_buftarg_shrink_scan( |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1568 | struct shrinker *shrink, |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 1569 | struct shrink_control *sc) |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1570 | { |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1571 | struct xfs_buftarg *btp = container_of(shrink, |
| 1572 | struct xfs_buftarg, bt_shrinker); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1573 | LIST_HEAD(dispose); |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1574 | unsigned long freed; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1575 | unsigned long nr_to_scan = sc->nr_to_scan; |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1576 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1577 | freed = list_lru_walk_node(&btp->bt_lru, sc->nid, xfs_buftarg_isolate, |
| 1578 | &dispose, &nr_to_scan); |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1579 | |
| 1580 | while (!list_empty(&dispose)) { |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1581 | struct xfs_buf *bp; |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 1582 | bp = list_first_entry(&dispose, struct xfs_buf, b_lru); |
| 1583 | list_del_init(&bp->b_lru); |
| 1584 | xfs_buf_rele(bp); |
| 1585 | } |
| 1586 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1587 | return freed; |
| 1588 | } |
| 1589 | |
Andrew Morton | addbda4 | 2013-08-28 10:18:06 +1000 | [diff] [blame] | 1590 | static unsigned long |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1591 | xfs_buftarg_shrink_count( |
| 1592 | struct shrinker *shrink, |
| 1593 | struct shrink_control *sc) |
| 1594 | { |
| 1595 | struct xfs_buftarg *btp = container_of(shrink, |
| 1596 | struct xfs_buftarg, bt_shrinker); |
| 1597 | return list_lru_count_node(&btp->bt_lru, sc->nid); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1598 | } |
| 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | void |
| 1601 | xfs_free_buftarg( |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1602 | struct xfs_mount *mp, |
| 1603 | struct xfs_buftarg *btp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | { |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1605 | unregister_shrinker(&btp->bt_shrinker); |
Glauber Costa | f5e1dd3 | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 1606 | list_lru_destroy(&btp->bt_lru); |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1607 | |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1608 | if (mp->m_flags & XFS_MOUNT_BARRIER) |
| 1609 | xfs_blkdev_issue_flush(btp); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1610 | |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1611 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | } |
| 1613 | |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1614 | int |
| 1615 | xfs_setsize_buftarg( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | xfs_buftarg_t *btp, |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1617 | unsigned int sectorsize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | { |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 1619 | /* Set up metadata sector size info */ |
Eric Sandeen | 6da5417 | 2014-01-21 16:45:52 -0600 | [diff] [blame] | 1620 | btp->bt_meta_sectorsize = sectorsize; |
| 1621 | btp->bt_meta_sectormask = sectorsize - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1623 | if (set_blocksize(btp->bt_bdev, sectorsize)) { |
Christoph Hellwig | 02b102d | 2011-10-10 16:52:51 +0000 | [diff] [blame] | 1624 | char name[BDEVNAME_SIZE]; |
| 1625 | |
| 1626 | bdevname(btp->bt_bdev, name); |
| 1627 | |
Dave Chinner | 4f10700 | 2011-03-07 10:00:35 +1100 | [diff] [blame] | 1628 | xfs_warn(btp->bt_mount, |
Eric Sandeen | 08e96e1 | 2013-10-11 20:59:05 -0500 | [diff] [blame] | 1629 | "Cannot set_blocksize to %u on device %s", |
Christoph Hellwig | 02b102d | 2011-10-10 16:52:51 +0000 | [diff] [blame] | 1630 | sectorsize, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | return EINVAL; |
| 1632 | } |
| 1633 | |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 1634 | /* Set up device logical sector size mask */ |
| 1635 | btp->bt_logical_sectorsize = bdev_logical_block_size(btp->bt_bdev); |
| 1636 | btp->bt_logical_sectormask = bdev_logical_block_size(btp->bt_bdev) - 1; |
| 1637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | return 0; |
| 1639 | } |
| 1640 | |
| 1641 | /* |
Eric Sandeen | 3fefdee | 2013-11-13 14:53:45 -0600 | [diff] [blame] | 1642 | * When allocating the initial buffer target we have not yet |
| 1643 | * read in the superblock, so don't know what sized sectors |
| 1644 | * are being used at this early stage. Play safe. |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1645 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | STATIC int |
| 1647 | xfs_setsize_buftarg_early( |
| 1648 | xfs_buftarg_t *btp, |
| 1649 | struct block_device *bdev) |
| 1650 | { |
Eric Sandeen | a96c415 | 2014-04-14 19:00:29 +1000 | [diff] [blame] | 1651 | return xfs_setsize_buftarg(btp, bdev_logical_block_size(bdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | } |
| 1653 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | xfs_buftarg_t * |
| 1655 | xfs_alloc_buftarg( |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1656 | struct xfs_mount *mp, |
Eric Sandeen | 34dcefd | 2014-04-14 19:01:00 +1000 | [diff] [blame] | 1657 | struct block_device *bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | { |
| 1659 | xfs_buftarg_t *btp; |
| 1660 | |
Dave Chinner | b17cb36 | 2013-05-20 09:51:12 +1000 | [diff] [blame] | 1661 | btp = kmem_zalloc(sizeof(*btp), KM_SLEEP | KM_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1663 | btp->bt_mount = mp; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1664 | btp->bt_dev = bdev->bd_dev; |
| 1665 | btp->bt_bdev = bdev; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 1666 | btp->bt_bdi = blk_get_backing_dev_info(bdev); |
| 1667 | if (!btp->bt_bdi) |
| 1668 | goto error; |
| 1669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | if (xfs_setsize_buftarg_early(btp, bdev)) |
| 1671 | goto error; |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 1672 | |
| 1673 | if (list_lru_init(&btp->bt_lru)) |
| 1674 | goto error; |
| 1675 | |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1676 | btp->bt_shrinker.count_objects = xfs_buftarg_shrink_count; |
| 1677 | btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan; |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1678 | btp->bt_shrinker.seeks = DEFAULT_SEEKS; |
Dave Chinner | e80dfa1 | 2013-08-28 10:18:05 +1000 | [diff] [blame] | 1679 | btp->bt_shrinker.flags = SHRINKER_NUMA_AWARE; |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 1680 | register_shrinker(&btp->bt_shrinker); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | return btp; |
| 1682 | |
| 1683 | error: |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1684 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | return NULL; |
| 1686 | } |
| 1687 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | /* |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1689 | * Add a buffer to the delayed write list. |
| 1690 | * |
| 1691 | * This queues a buffer for writeout if it hasn't already been. Note that |
| 1692 | * neither this routine nor the buffer list submission functions perform |
| 1693 | * any internal synchronization. It is expected that the lists are thread-local |
| 1694 | * to the callers. |
| 1695 | * |
| 1696 | * Returns true if we queued up the buffer, or false if it already had |
| 1697 | * been on the buffer list. |
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 | bool |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1700 | xfs_buf_delwri_queue( |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1701 | struct xfs_buf *bp, |
| 1702 | struct list_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1704 | ASSERT(xfs_buf_islocked(bp)); |
| 1705 | ASSERT(!(bp->b_flags & XBF_READ)); |
| 1706 | |
| 1707 | /* |
| 1708 | * If the buffer is already marked delwri it already is queued up |
| 1709 | * by someone else for imediate writeout. Just ignore it in that |
| 1710 | * case. |
| 1711 | */ |
| 1712 | if (bp->b_flags & _XBF_DELWRI_Q) { |
| 1713 | trace_xfs_buf_delwri_queued(bp, _RET_IP_); |
| 1714 | return false; |
| 1715 | } |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1716 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1717 | trace_xfs_buf_delwri_queue(bp, _RET_IP_); |
| 1718 | |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 1719 | /* |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1720 | * If a buffer gets written out synchronously or marked stale while it |
| 1721 | * is on a delwri list we lazily remove it. To do this, the other party |
| 1722 | * clears the _XBF_DELWRI_Q flag but otherwise leaves the buffer alone. |
| 1723 | * It remains referenced and on the list. In a rare corner case it |
| 1724 | * might get readded to a delwri list after the synchronous writeout, in |
| 1725 | * which case we need just need to re-add the flag here. |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 1726 | */ |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1727 | bp->b_flags |= _XBF_DELWRI_Q; |
| 1728 | if (list_empty(&bp->b_list)) { |
| 1729 | atomic_inc(&bp->b_hold); |
| 1730 | list_add_tail(&bp->b_list, list); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1731 | } |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1732 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1733 | return true; |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1734 | } |
| 1735 | |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1736 | /* |
| 1737 | * Compare function is more complex than it needs to be because |
| 1738 | * the return value is only 32 bits and we are doing comparisons |
| 1739 | * on 64 bit values |
| 1740 | */ |
| 1741 | static int |
| 1742 | xfs_buf_cmp( |
| 1743 | void *priv, |
| 1744 | struct list_head *a, |
| 1745 | struct list_head *b) |
| 1746 | { |
| 1747 | struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list); |
| 1748 | struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list); |
| 1749 | xfs_daddr_t diff; |
| 1750 | |
Mark Tinguely | f4b4242 | 2012-12-04 17:18:02 -0600 | [diff] [blame] | 1751 | 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] | 1752 | if (diff < 0) |
| 1753 | return -1; |
| 1754 | if (diff > 0) |
| 1755 | return 1; |
| 1756 | return 0; |
| 1757 | } |
| 1758 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1759 | static int |
| 1760 | __xfs_buf_delwri_submit( |
| 1761 | struct list_head *buffer_list, |
| 1762 | struct list_head *io_list, |
| 1763 | bool wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | { |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1765 | struct blk_plug plug; |
| 1766 | struct xfs_buf *bp, *n; |
| 1767 | int pinned = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1769 | list_for_each_entry_safe(bp, n, buffer_list, b_list) { |
| 1770 | if (!wait) { |
| 1771 | if (xfs_buf_ispinned(bp)) { |
| 1772 | pinned++; |
| 1773 | continue; |
| 1774 | } |
| 1775 | if (!xfs_buf_trylock(bp)) |
| 1776 | continue; |
| 1777 | } else { |
| 1778 | xfs_buf_lock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1781 | /* |
| 1782 | * Someone else might have written the buffer synchronously or |
| 1783 | * marked it stale in the meantime. In that case only the |
| 1784 | * _XBF_DELWRI_Q flag got cleared, and we have to drop the |
| 1785 | * reference and remove it from the list here. |
| 1786 | */ |
| 1787 | if (!(bp->b_flags & _XBF_DELWRI_Q)) { |
| 1788 | list_del_init(&bp->b_list); |
| 1789 | xfs_buf_relse(bp); |
| 1790 | continue; |
| 1791 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1793 | list_move_tail(&bp->b_list, io_list); |
| 1794 | trace_xfs_buf_delwri_split(bp, _RET_IP_); |
| 1795 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1797 | list_sort(NULL, io_list, xfs_buf_cmp); |
Christoph Hellwig | a1b7ea5 | 2011-03-30 11:05:09 +0000 | [diff] [blame] | 1798 | |
| 1799 | blk_start_plug(&plug); |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1800 | list_for_each_entry_safe(bp, n, io_list, b_list) { |
Dave Chinner | ac8809f | 2013-12-12 16:34:38 +1100 | [diff] [blame] | 1801 | bp->b_flags &= ~(_XBF_DELWRI_Q | XBF_ASYNC | XBF_WRITE_FAIL); |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1802 | bp->b_flags |= XBF_WRITE; |
| 1803 | |
| 1804 | if (!wait) { |
| 1805 | bp->b_flags |= XBF_ASYNC; |
| 1806 | list_del_init(&bp->b_list); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1807 | } |
Christoph Hellwig | 939d723 | 2010-07-20 17:51:16 +1000 | [diff] [blame] | 1808 | xfs_bdstrat_cb(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | } |
Christoph Hellwig | a1b7ea5 | 2011-03-30 11:05:09 +0000 | [diff] [blame] | 1810 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1812 | return pinned; |
| 1813 | } |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 1814 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1815 | /* |
| 1816 | * Write out a buffer list asynchronously. |
| 1817 | * |
| 1818 | * This will take the @buffer_list, write all non-locked and non-pinned buffers |
| 1819 | * out and not wait for I/O completion on any of the buffers. This interface |
| 1820 | * is only safely useable for callers that can track I/O completion by higher |
| 1821 | * level means, e.g. AIL pushing as the @buffer_list is consumed in this |
| 1822 | * function. |
| 1823 | */ |
| 1824 | int |
| 1825 | xfs_buf_delwri_submit_nowait( |
| 1826 | struct list_head *buffer_list) |
| 1827 | { |
| 1828 | LIST_HEAD (io_list); |
| 1829 | return __xfs_buf_delwri_submit(buffer_list, &io_list, false); |
| 1830 | } |
| 1831 | |
| 1832 | /* |
| 1833 | * Write out a buffer list synchronously. |
| 1834 | * |
| 1835 | * This will take the @buffer_list, write all buffers out and wait for I/O |
| 1836 | * completion on all of the buffers. @buffer_list is consumed by the function, |
| 1837 | * so callers must have some other way of tracking buffers if they require such |
| 1838 | * functionality. |
| 1839 | */ |
| 1840 | int |
| 1841 | xfs_buf_delwri_submit( |
| 1842 | struct list_head *buffer_list) |
| 1843 | { |
| 1844 | LIST_HEAD (io_list); |
| 1845 | int error = 0, error2; |
| 1846 | struct xfs_buf *bp; |
| 1847 | |
| 1848 | __xfs_buf_delwri_submit(buffer_list, &io_list, true); |
| 1849 | |
| 1850 | /* Wait for IO to complete. */ |
| 1851 | while (!list_empty(&io_list)) { |
| 1852 | bp = list_first_entry(&io_list, struct xfs_buf, b_list); |
| 1853 | |
| 1854 | list_del_init(&bp->b_list); |
| 1855 | error2 = xfs_buf_iowait(bp); |
| 1856 | xfs_buf_relse(bp); |
| 1857 | if (!error) |
| 1858 | error = error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | } |
| 1860 | |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 1861 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | } |
| 1863 | |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1864 | int __init |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1865 | xfs_buf_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | { |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1867 | xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", |
| 1868 | KM_ZONE_HWALIGN, NULL); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1869 | if (!xfs_buf_zone) |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1870 | goto out; |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1871 | |
Dave Chinner | 51749e4 | 2010-09-08 09:00:22 +0000 | [diff] [blame] | 1872 | xfslogd_workqueue = alloc_workqueue("xfslogd", |
Tejun Heo | 6370a6a | 2010-10-11 15:12:27 +0200 | [diff] [blame] | 1873 | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1874 | if (!xfslogd_workqueue) |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1875 | goto out_free_buf_zone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1877 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1879 | out_free_buf_zone: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1880 | kmem_zone_destroy(xfs_buf_zone); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1881 | out: |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1882 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | } |
| 1884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1886 | xfs_buf_terminate(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | { |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1888 | destroy_workqueue(xfslogd_workqueue); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1889 | kmem_zone_destroy(xfs_buf_zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | } |