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> |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 36 | #include <linux/list_sort.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 38 | #include "xfs_sb.h" |
| 39 | #include "xfs_inum.h" |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 40 | #include "xfs_log.h" |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 41 | #include "xfs_ag.h" |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 42 | #include "xfs_mount.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 43 | #include "xfs_trace.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; |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 46 | STATIC int xfsbufd(void *); |
Dave Chinner | 7f8275d | 2010-07-19 14:56:17 +1000 | [diff] [blame] | 47 | STATIC int xfsbufd_wakeup(struct shrinker *, int, gfp_t); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 48 | STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int); |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 49 | static struct shrinker xfs_buf_shake = { |
| 50 | .shrink = xfsbufd_wakeup, |
| 51 | .seeks = DEFAULT_SEEKS, |
| 52 | }; |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 53 | |
David Chinner | 7989cb8 | 2007-02-10 18:34:56 +1100 | [diff] [blame] | 54 | static struct workqueue_struct *xfslogd_workqueue; |
Christoph Hellwig | 0829c36 | 2005-09-02 16:58:49 +1000 | [diff] [blame] | 55 | struct workqueue_struct *xfsdatad_workqueue; |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 56 | struct workqueue_struct *xfsconvertd_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 58 | #ifdef XFS_BUF_LOCK_TRACKING |
| 59 | # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid) |
| 60 | # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1) |
| 61 | # define XB_GET_OWNER(bp) ((bp)->b_last_holder) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #else |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 63 | # define XB_SET_OWNER(bp) do { } while (0) |
| 64 | # define XB_CLEAR_OWNER(bp) do { } while (0) |
| 65 | # define XB_GET_OWNER(bp) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #endif |
| 67 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 68 | #define xb_to_gfp(flags) \ |
| 69 | ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : \ |
| 70 | ((flags) & XBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 72 | #define xb_to_km(flags) \ |
| 73 | (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 75 | #define xfs_buf_allocate(flags) \ |
| 76 | kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags)) |
| 77 | #define xfs_buf_deallocate(bp) \ |
| 78 | kmem_zone_free(xfs_buf_zone, (bp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 80 | static inline int |
| 81 | xfs_buf_is_vmapped( |
| 82 | struct xfs_buf *bp) |
| 83 | { |
| 84 | /* |
| 85 | * Return true if the buffer is vmapped. |
| 86 | * |
| 87 | * The XBF_MAPPED flag is set if the buffer should be mapped, but the |
| 88 | * code is clever enough to know it doesn't have to map a single page, |
| 89 | * so the check has to be both for XBF_MAPPED and bp->b_page_count > 1. |
| 90 | */ |
| 91 | return (bp->b_flags & XBF_MAPPED) && bp->b_page_count > 1; |
| 92 | } |
| 93 | |
| 94 | static inline int |
| 95 | xfs_buf_vmap_len( |
| 96 | struct xfs_buf *bp) |
| 97 | { |
| 98 | return (bp->b_page_count * PAGE_SIZE) - bp->b_offset; |
| 99 | } |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 102 | * Page Region interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 104 | * For pages in filesystems where the blocksize is smaller than the |
| 105 | * pagesize, we use the page->private field (long) to hold a bitmap |
| 106 | * of uptodate regions within the page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 108 | * Each such region is "bytes per page / bits per long" bytes long. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 110 | * NBPPR == number-of-bytes-per-page-region |
| 111 | * BTOPR == bytes-to-page-region (rounded up) |
| 112 | * BTOPRT == bytes-to-page-region-truncated (rounded down) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | */ |
| 114 | #if (BITS_PER_LONG == 32) |
| 115 | #define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */ |
| 116 | #elif (BITS_PER_LONG == 64) |
| 117 | #define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */ |
| 118 | #else |
| 119 | #error BITS_PER_LONG must be 32 or 64 |
| 120 | #endif |
| 121 | #define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG) |
| 122 | #define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT) |
| 123 | #define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT)) |
| 124 | |
| 125 | STATIC unsigned long |
| 126 | page_region_mask( |
| 127 | size_t offset, |
| 128 | size_t length) |
| 129 | { |
| 130 | unsigned long mask; |
| 131 | int first, final; |
| 132 | |
| 133 | first = BTOPR(offset); |
| 134 | final = BTOPRT(offset + length - 1); |
| 135 | first = min(first, final); |
| 136 | |
| 137 | mask = ~0UL; |
| 138 | mask <<= BITS_PER_LONG - (final - first); |
| 139 | mask >>= BITS_PER_LONG - (final); |
| 140 | |
| 141 | ASSERT(offset + length <= PAGE_CACHE_SIZE); |
| 142 | ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0); |
| 143 | |
| 144 | return mask; |
| 145 | } |
| 146 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 147 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | set_page_region( |
| 149 | struct page *page, |
| 150 | size_t offset, |
| 151 | size_t length) |
| 152 | { |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 153 | set_page_private(page, |
| 154 | page_private(page) | page_region_mask(offset, length)); |
| 155 | if (page_private(page) == ~0UL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | SetPageUptodate(page); |
| 157 | } |
| 158 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 159 | STATIC int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | test_page_region( |
| 161 | struct page *page, |
| 162 | size_t offset, |
| 163 | size_t length) |
| 164 | { |
| 165 | unsigned long mask = page_region_mask(offset, length); |
| 166 | |
Hugh Dickins | 4c21e2f | 2005-10-29 18:16:40 -0700 | [diff] [blame] | 167 | return (mask && (page_private(page) & mask) == mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 171 | * Internal xfs_buf_t object manipulation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | */ |
| 173 | |
| 174 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 175 | _xfs_buf_initialize( |
| 176 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | xfs_buftarg_t *target, |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 178 | xfs_off_t range_base, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | size_t range_length, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 180 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
| 182 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 183 | * We don't want certain flags to appear in b_flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 185 | flags &= ~(XBF_LOCK|XBF_MAPPED|XBF_DONT_BLOCK|XBF_READ_AHEAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 187 | memset(bp, 0, sizeof(xfs_buf_t)); |
| 188 | atomic_set(&bp->b_hold, 1); |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 189 | init_completion(&bp->b_iowait); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 190 | INIT_LIST_HEAD(&bp->b_list); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 191 | RB_CLEAR_NODE(&bp->b_rbnode); |
Thomas Gleixner | a731cd1 | 2010-09-07 14:33:15 +0000 | [diff] [blame] | 192 | sema_init(&bp->b_sema, 0); /* held, no waiters */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 193 | XB_SET_OWNER(bp); |
| 194 | bp->b_target = target; |
| 195 | bp->b_file_offset = range_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* |
| 197 | * Set buffer_length and count_desired to the same value initially. |
| 198 | * I/O routines should use count_desired, which will be the same in |
| 199 | * most cases but may be reset (e.g. XFS recovery). |
| 200 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 201 | bp->b_buffer_length = bp->b_count_desired = range_length; |
| 202 | bp->b_flags = flags; |
| 203 | bp->b_bn = XFS_BUF_DADDR_NULL; |
| 204 | atomic_set(&bp->b_pin_count, 0); |
| 205 | init_waitqueue_head(&bp->b_waiters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 207 | XFS_STATS_INC(xb_create); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 208 | |
| 209 | trace_xfs_buf_init(bp, _RET_IP_); |
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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | int page_count, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 220 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
| 222 | /* Make sure that we have a page list */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 223 | if (bp->b_pages == NULL) { |
| 224 | bp->b_offset = xfs_buf_poff(bp->b_file_offset); |
| 225 | bp->b_page_count = page_count; |
| 226 | if (page_count <= XB_PAGES) { |
| 227 | bp->b_pages = bp->b_page_array; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 229 | bp->b_pages = kmem_alloc(sizeof(struct page *) * |
| 230 | page_count, xb_to_km(flags)); |
| 231 | if (bp->b_pages == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return -ENOMEM; |
| 233 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 234 | memset(bp->b_pages, 0, sizeof(struct page *) * page_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 240 | * Frees b_pages if it was allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | */ |
| 242 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 243 | _xfs_buf_free_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | xfs_buf_t *bp) |
| 245 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 246 | if (bp->b_pages != bp->b_page_array) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 247 | kmem_free(bp->b_pages); |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 248 | bp->b_pages = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Releases the specified buffer. |
| 254 | * |
| 255 | * The modification state of any associated pages is left unchanged. |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 256 | * The buffer most not be on any hash - use xfs_buf_rele instead for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | * hashed and refcounted buffers |
| 258 | */ |
| 259 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 260 | xfs_buf_free( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | xfs_buf_t *bp) |
| 262 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 263 | trace_xfs_buf_free(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 265 | if (bp->b_flags & (_XBF_PAGE_CACHE|_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 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 275 | if (bp->b_flags & _XBF_PAGE_CACHE) |
| 276 | ASSERT(!PagePrivate(page)); |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 277 | page_cache_release(page); |
| 278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
Dave Chinner | 3fc98b1 | 2009-12-14 23:11:57 +0000 | [diff] [blame] | 280 | _xfs_buf_free_pages(bp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 281 | xfs_buf_deallocate(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Finds all pages for buffer in question and builds it's page list. |
| 286 | */ |
| 287 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 288 | _xfs_buf_lookup_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | xfs_buf_t *bp, |
| 290 | uint flags) |
| 291 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 292 | struct address_space *mapping = bp->b_target->bt_mapping; |
| 293 | size_t blocksize = bp->b_target->bt_bsize; |
| 294 | size_t size = bp->b_count_desired; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | size_t nbytes, offset; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 296 | gfp_t gfp_mask = xb_to_gfp(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | unsigned short page_count, i; |
| 298 | pgoff_t first; |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 299 | xfs_off_t end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | int error; |
| 301 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 302 | end = bp->b_file_offset + bp->b_buffer_length; |
| 303 | page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 305 | error = _xfs_buf_get_pages(bp, page_count, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | if (unlikely(error)) |
| 307 | return error; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 308 | bp->b_flags |= _XBF_PAGE_CACHE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 310 | offset = bp->b_offset; |
| 311 | first = bp->b_file_offset >> PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 313 | for (i = 0; i < bp->b_page_count; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | struct page *page; |
| 315 | uint retries = 0; |
| 316 | |
| 317 | retry: |
| 318 | page = find_or_create_page(mapping, first + i, gfp_mask); |
| 319 | if (unlikely(page == NULL)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 320 | if (flags & XBF_READ_AHEAD) { |
| 321 | bp->b_page_count = i; |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 322 | for (i = 0; i < bp->b_page_count; i++) |
| 323 | unlock_page(bp->b_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | return -ENOMEM; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * This could deadlock. |
| 329 | * |
| 330 | * But until all the XFS lowlevel code is revamped to |
| 331 | * handle buffer allocation failures we can't do much. |
| 332 | */ |
| 333 | if (!(++retries % 100)) |
| 334 | printk(KERN_ERR |
| 335 | "XFS: possible memory allocation " |
| 336 | "deadlock in %s (mode:0x%x)\n", |
Harvey Harrison | 34a622b | 2008-04-10 12:19:21 +1000 | [diff] [blame] | 337 | __func__, gfp_mask); |
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 | XFS_STATS_INC(xb_page_retries); |
Dave Chinner | 7f8275d | 2010-07-19 14:56:17 +1000 | [diff] [blame] | 340 | xfsbufd_wakeup(NULL, 0, gfp_mask); |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 341 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | goto retry; |
| 343 | } |
| 344 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 345 | XFS_STATS_INC(xb_page_found); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
| 347 | nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset); |
| 348 | size -= nbytes; |
| 349 | |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 350 | ASSERT(!PagePrivate(page)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | if (!PageUptodate(page)) { |
| 352 | page_count--; |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 353 | if (blocksize >= PAGE_CACHE_SIZE) { |
| 354 | if (flags & XBF_READ) |
| 355 | bp->b_flags |= _XBF_PAGE_LOCKED; |
| 356 | } else if (!PagePrivate(page)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | if (test_page_region(page, offset, nbytes)) |
| 358 | page_count++; |
| 359 | } |
| 360 | } |
| 361 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 362 | bp->b_pages[i] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | offset = 0; |
| 364 | } |
| 365 | |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 366 | if (!(bp->b_flags & _XBF_PAGE_LOCKED)) { |
| 367 | for (i = 0; i < bp->b_page_count; i++) |
| 368 | unlock_page(bp->b_pages[i]); |
| 369 | } |
| 370 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 371 | if (page_count == bp->b_page_count) |
| 372 | bp->b_flags |= XBF_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | return error; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Map buffer into kernel address-space if nessecary. |
| 379 | */ |
| 380 | STATIC int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 381 | _xfs_buf_map_pages( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | xfs_buf_t *bp, |
| 383 | uint flags) |
| 384 | { |
| 385 | /* A single page buffer is always mappable */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 386 | if (bp->b_page_count == 1) { |
| 387 | bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; |
| 388 | bp->b_flags |= XBF_MAPPED; |
| 389 | } else if (flags & XBF_MAPPED) { |
Alex Elder | 8a262e5 | 2010-03-16 18:55:56 +0000 | [diff] [blame] | 390 | bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, |
| 391 | -1, PAGE_KERNEL); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 392 | if (unlikely(bp->b_addr == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return -ENOMEM; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 394 | bp->b_addr += bp->b_offset; |
| 395 | bp->b_flags |= XBF_MAPPED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Finding and Reading Buffers |
| 403 | */ |
| 404 | |
| 405 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 406 | * Look up, and creates if absent, a lockable buffer for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | * a given range of an inode. The buffer is returned |
| 408 | * locked. If other overlapping buffers exist, they are |
| 409 | * released before the new buffer is created and locked, |
| 410 | * which may imply that this call will block until those buffers |
| 411 | * are unlocked. No I/O is implied by this call. |
| 412 | */ |
| 413 | xfs_buf_t * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 414 | _xfs_buf_find( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | xfs_buftarg_t *btp, /* block device target */ |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 416 | xfs_off_t ioff, /* starting offset of range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | size_t isize, /* length of range */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 418 | xfs_buf_flags_t flags, |
| 419 | xfs_buf_t *new_bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | { |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 421 | xfs_off_t range_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | size_t range_length; |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 423 | struct xfs_perag *pag; |
| 424 | struct rb_node **rbp; |
| 425 | struct rb_node *parent; |
| 426 | xfs_buf_t *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | range_base = (ioff << BBSHIFT); |
| 429 | range_length = (isize << BBSHIFT); |
| 430 | |
| 431 | /* Check for IOs smaller than the sector size / not sector aligned */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 432 | ASSERT(!(range_length < (1 << btp->bt_sshift))); |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 433 | ASSERT(!(range_base & (xfs_off_t)btp->bt_smask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 435 | /* get tree root */ |
| 436 | pag = xfs_perag_get(btp->bt_mount, |
| 437 | xfs_daddr_to_agno(btp->bt_mount, ioff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 439 | /* walk tree */ |
| 440 | spin_lock(&pag->pag_buf_lock); |
| 441 | rbp = &pag->pag_buf_tree.rb_node; |
| 442 | parent = NULL; |
| 443 | bp = NULL; |
| 444 | while (*rbp) { |
| 445 | parent = *rbp; |
| 446 | bp = rb_entry(parent, struct xfs_buf, b_rbnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 448 | if (range_base < bp->b_file_offset) |
| 449 | rbp = &(*rbp)->rb_left; |
| 450 | else if (range_base > bp->b_file_offset) |
| 451 | rbp = &(*rbp)->rb_right; |
| 452 | else { |
| 453 | /* |
| 454 | * found a block offset match. If the range doesn't |
| 455 | * match, the only way this is allowed is if the buffer |
| 456 | * in the cache is stale and the transaction that made |
| 457 | * it stale has not yet committed. i.e. we are |
| 458 | * reallocating a busy extent. Skip this buffer and |
| 459 | * continue searching to the right for an exact match. |
| 460 | */ |
| 461 | if (bp->b_buffer_length != range_length) { |
| 462 | ASSERT(bp->b_flags & XBF_STALE); |
| 463 | rbp = &(*rbp)->rb_right; |
| 464 | continue; |
| 465 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 466 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | goto found; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* No match found */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 472 | if (new_bp) { |
| 473 | _xfs_buf_initialize(new_bp, btp, range_base, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | range_length, flags); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 475 | rb_link_node(&new_bp->b_rbnode, parent, rbp); |
| 476 | rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree); |
| 477 | /* the buffer keeps the perag reference until it is freed */ |
| 478 | new_bp->b_pag = pag; |
| 479 | spin_unlock(&pag->pag_buf_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 481 | XFS_STATS_INC(xb_miss_locked); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 482 | spin_unlock(&pag->pag_buf_lock); |
| 483 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 485 | return new_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
| 487 | found: |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 488 | spin_unlock(&pag->pag_buf_lock); |
| 489 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
| 491 | /* Attempt to get the semaphore without sleeping, |
| 492 | * if this does not work then we need to drop the |
| 493 | * spinlock and do a hard attempt on the semaphore. |
| 494 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 495 | if (down_trylock(&bp->b_sema)) { |
| 496 | if (!(flags & XBF_TRYLOCK)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | /* wait for buffer ownership */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 498 | xfs_buf_lock(bp); |
| 499 | XFS_STATS_INC(xb_get_locked_waited); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } else { |
| 501 | /* We asked for a trylock and failed, no need |
| 502 | * to look at file offset and length here, we |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 503 | * know that this buffer at least overlaps our |
| 504 | * buffer and is locked, therefore our buffer |
| 505 | * either does not exist, or is this buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 507 | xfs_buf_rele(bp); |
| 508 | XFS_STATS_INC(xb_busy_locked); |
| 509 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | } else { |
| 512 | /* trylock worked */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 513 | XB_SET_OWNER(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
| 515 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 516 | if (bp->b_flags & XBF_STALE) { |
| 517 | ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); |
| 518 | bp->b_flags &= XBF_MAPPED; |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 519 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 520 | |
| 521 | trace_xfs_buf_find(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 522 | XFS_STATS_INC(xb_get_locked); |
| 523 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 527 | * Assembles a buffer covering the specified range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | * Storage in memory for all portions of the buffer will be allocated, |
| 529 | * although backing storage may not be. |
| 530 | */ |
| 531 | xfs_buf_t * |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 532 | xfs_buf_get( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | xfs_buftarg_t *target,/* target for buffer */ |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 534 | xfs_off_t ioff, /* starting offset of range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | size_t isize, /* length of range */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 536 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 538 | xfs_buf_t *bp, *new_bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | int error = 0, i; |
| 540 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 541 | new_bp = xfs_buf_allocate(flags); |
| 542 | if (unlikely(!new_bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | return NULL; |
| 544 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 545 | bp = _xfs_buf_find(target, ioff, isize, flags, new_bp); |
| 546 | if (bp == new_bp) { |
| 547 | error = _xfs_buf_lookup_pages(bp, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | if (error) |
| 549 | goto no_buffer; |
| 550 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 551 | xfs_buf_deallocate(new_bp); |
| 552 | if (unlikely(bp == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | return NULL; |
| 554 | } |
| 555 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 556 | for (i = 0; i < bp->b_page_count; i++) |
| 557 | mark_page_accessed(bp->b_pages[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 559 | if (!(bp->b_flags & XBF_MAPPED)) { |
| 560 | error = _xfs_buf_map_pages(bp, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | if (unlikely(error)) { |
| 562 | printk(KERN_WARNING "%s: failed to map pages\n", |
Harvey Harrison | 34a622b | 2008-04-10 12:19:21 +1000 | [diff] [blame] | 563 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | goto no_buffer; |
| 565 | } |
| 566 | } |
| 567 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 568 | XFS_STATS_INC(xb_get); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | /* |
| 571 | * Always fill in the block number now, the mapped cases can do |
| 572 | * their own overlay of this later. |
| 573 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 574 | bp->b_bn = ioff; |
| 575 | bp->b_count_desired = bp->b_buffer_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 577 | trace_xfs_buf_get(bp, flags, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 578 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | no_buffer: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 581 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
| 582 | xfs_buf_unlock(bp); |
| 583 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return NULL; |
| 585 | } |
| 586 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 587 | STATIC int |
| 588 | _xfs_buf_read( |
| 589 | xfs_buf_t *bp, |
| 590 | xfs_buf_flags_t flags) |
| 591 | { |
| 592 | int status; |
| 593 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 594 | ASSERT(!(flags & (XBF_DELWRI|XBF_WRITE))); |
| 595 | ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL); |
| 596 | |
| 597 | bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \ |
| 598 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); |
| 599 | bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | \ |
| 600 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); |
| 601 | |
| 602 | status = xfs_buf_iorequest(bp); |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 603 | if (status || XFS_BUF_ISERROR(bp) || (flags & XBF_ASYNC)) |
| 604 | return status; |
| 605 | return xfs_buf_iowait(bp); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 606 | } |
| 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | xfs_buf_t * |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 609 | xfs_buf_read( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | xfs_buftarg_t *target, |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 611 | xfs_off_t ioff, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | size_t isize, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 613 | xfs_buf_flags_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 615 | xfs_buf_t *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 617 | flags |= XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 619 | bp = xfs_buf_get(target, ioff, isize, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 620 | if (bp) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 621 | trace_xfs_buf_read(bp, flags, _RET_IP_); |
| 622 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 623 | if (!XFS_BUF_ISDONE(bp)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 624 | XFS_STATS_INC(xb_get_read); |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 625 | _xfs_buf_read(bp, flags); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 626 | } else if (flags & XBF_ASYNC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | /* |
| 628 | * Read ahead call which is already satisfied, |
| 629 | * drop the buffer |
| 630 | */ |
| 631 | goto no_buffer; |
| 632 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* We do not want read in the flags */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 634 | bp->b_flags &= ~XBF_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | } |
| 637 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 638 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
| 640 | no_buffer: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 641 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
| 642 | xfs_buf_unlock(bp); |
| 643 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return NULL; |
| 645 | } |
| 646 | |
| 647 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 648 | * If we are not low on memory then do the readahead in a deadlock |
| 649 | * safe manner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | */ |
| 651 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 652 | xfs_buf_readahead( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | xfs_buftarg_t *target, |
Nathan Scott | 204ab25 | 2006-01-11 20:50:22 +1100 | [diff] [blame] | 654 | xfs_off_t ioff, |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 655 | size_t isize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | { |
| 657 | struct backing_dev_info *bdi; |
| 658 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 659 | bdi = target->bt_mapping->backing_dev_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | if (bdi_read_congested(bdi)) |
| 661 | return; |
| 662 | |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 663 | xfs_buf_read(target, ioff, isize, |
| 664 | XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD|XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 667 | /* |
| 668 | * Read an uncached buffer from disk. Allocates and returns a locked |
| 669 | * buffer containing the disk contents or nothing. |
| 670 | */ |
| 671 | struct xfs_buf * |
| 672 | xfs_buf_read_uncached( |
| 673 | struct xfs_mount *mp, |
| 674 | struct xfs_buftarg *target, |
| 675 | xfs_daddr_t daddr, |
| 676 | size_t length, |
| 677 | int flags) |
| 678 | { |
| 679 | xfs_buf_t *bp; |
| 680 | int error; |
| 681 | |
| 682 | bp = xfs_buf_get_uncached(target, length, flags); |
| 683 | if (!bp) |
| 684 | return NULL; |
| 685 | |
| 686 | /* set up the buffer for a read IO */ |
| 687 | xfs_buf_lock(bp); |
| 688 | XFS_BUF_SET_ADDR(bp, daddr); |
| 689 | XFS_BUF_READ(bp); |
| 690 | XFS_BUF_BUSY(bp); |
| 691 | |
| 692 | xfsbdstrat(mp, bp); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 693 | error = xfs_buf_iowait(bp); |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 694 | if (error || bp->b_error) { |
| 695 | xfs_buf_relse(bp); |
| 696 | return NULL; |
| 697 | } |
| 698 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | xfs_buf_t * |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 702 | xfs_buf_get_empty( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | size_t len, |
| 704 | xfs_buftarg_t *target) |
| 705 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 706 | xfs_buf_t *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 708 | bp = xfs_buf_allocate(0); |
| 709 | if (bp) |
| 710 | _xfs_buf_initialize(bp, target, 0, len, 0); |
| 711 | return bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | static inline struct page * |
| 715 | mem_to_page( |
| 716 | void *addr) |
| 717 | { |
Christoph Lameter | 9e2779f | 2008-02-04 22:28:34 -0800 | [diff] [blame] | 718 | if ((!is_vmalloc_addr(addr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return virt_to_page(addr); |
| 720 | } else { |
| 721 | return vmalloc_to_page(addr); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 726 | xfs_buf_associate_memory( |
| 727 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | void *mem, |
| 729 | size_t len) |
| 730 | { |
| 731 | int rval; |
| 732 | int i = 0; |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 733 | unsigned long pageaddr; |
| 734 | unsigned long offset; |
| 735 | size_t buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | int page_count; |
| 737 | |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 738 | pageaddr = (unsigned long)mem & PAGE_CACHE_MASK; |
| 739 | offset = (unsigned long)mem - pageaddr; |
| 740 | buflen = PAGE_CACHE_ALIGN(len + offset); |
| 741 | page_count = buflen >> PAGE_CACHE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | /* Free any previous set of page pointers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 744 | if (bp->b_pages) |
| 745 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 747 | bp->b_pages = NULL; |
| 748 | bp->b_addr = mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Christoph Hellwig | 36fae17 | 2009-07-18 18:14:58 -0400 | [diff] [blame] | 750 | rval = _xfs_buf_get_pages(bp, page_count, XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | if (rval) |
| 752 | return rval; |
| 753 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 754 | bp->b_offset = offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 756 | for (i = 0; i < bp->b_page_count; i++) { |
| 757 | bp->b_pages[i] = mem_to_page((void *)pageaddr); |
| 758 | pageaddr += PAGE_CACHE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Lachlan McIlroy | d1afb67 | 2007-11-27 17:01:24 +1100 | [diff] [blame] | 761 | bp->b_count_desired = len; |
| 762 | bp->b_buffer_length = buflen; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 763 | bp->b_flags |= XBF_MAPPED; |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 764 | bp->b_flags &= ~_XBF_PAGE_LOCKED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | return 0; |
| 767 | } |
| 768 | |
| 769 | xfs_buf_t * |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 770 | xfs_buf_get_uncached( |
| 771 | struct xfs_buftarg *target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | size_t len, |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 773 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 775 | unsigned long page_count = PAGE_ALIGN(len) >> PAGE_SHIFT; |
| 776 | int error, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | xfs_buf_t *bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 779 | bp = xfs_buf_allocate(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | if (unlikely(bp == NULL)) |
| 781 | goto fail; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 782 | _xfs_buf_initialize(bp, target, 0, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 784 | error = _xfs_buf_get_pages(bp, page_count, 0); |
| 785 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | goto fail_free_buf; |
| 787 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 788 | for (i = 0; i < page_count; i++) { |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 789 | bp->b_pages[i] = alloc_page(xb_to_gfp(flags)); |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 790 | if (!bp->b_pages[i]) |
| 791 | goto fail_free_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 793 | bp->b_flags |= _XBF_PAGES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 795 | error = _xfs_buf_map_pages(bp, XBF_MAPPED); |
| 796 | if (unlikely(error)) { |
| 797 | printk(KERN_WARNING "%s: failed to map pages\n", |
Harvey Harrison | 34a622b | 2008-04-10 12:19:21 +1000 | [diff] [blame] | 798 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | goto fail_free_mem; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 800 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 802 | xfs_buf_unlock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 804 | trace_xfs_buf_get_uncached(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | return bp; |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | fail_free_mem: |
Christoph Hellwig | 1fa40b0 | 2007-05-14 18:23:50 +1000 | [diff] [blame] | 808 | while (--i >= 0) |
| 809 | __free_page(bp->b_pages[i]); |
Christoph Hellwig | ca165b8 | 2007-05-24 15:21:11 +1000 | [diff] [blame] | 810 | _xfs_buf_free_pages(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | fail_free_buf: |
Christoph Hellwig | ca165b8 | 2007-05-24 15:21:11 +1000 | [diff] [blame] | 812 | xfs_buf_deallocate(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | fail: |
| 814 | return NULL; |
| 815 | } |
| 816 | |
| 817 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | * Increment reference count on buffer, to hold the buffer concurrently |
| 819 | * with another thread which may release (free) the buffer asynchronously. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | * Must hold the buffer already to call this function. |
| 821 | */ |
| 822 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 823 | xfs_buf_hold( |
| 824 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 826 | trace_xfs_buf_hold(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 827 | atomic_inc(&bp->b_hold); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 831 | * Releases a hold on the specified buffer. If the |
| 832 | * the hold count is 1, calls xfs_buf_free. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | */ |
| 834 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 835 | xfs_buf_rele( |
| 836 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 838 | struct xfs_perag *pag = bp->b_pag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 840 | trace_xfs_buf_rele(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 842 | if (!pag) { |
Nathan Scott | fad3aa1 | 2006-02-01 12:14:52 +1100 | [diff] [blame] | 843 | ASSERT(!bp->b_relse); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 844 | ASSERT(RB_EMPTY_NODE(&bp->b_rbnode)); |
Nathan Scott | fad3aa1 | 2006-02-01 12:14:52 +1100 | [diff] [blame] | 845 | if (atomic_dec_and_test(&bp->b_hold)) |
| 846 | xfs_buf_free(bp); |
| 847 | return; |
| 848 | } |
| 849 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 850 | ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode)); |
Lachlan McIlroy | 3790689 | 2008-08-13 15:42:10 +1000 | [diff] [blame] | 851 | ASSERT(atomic_read(&bp->b_hold) > 0); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 852 | if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 853 | if (bp->b_relse) { |
| 854 | atomic_inc(&bp->b_hold); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 855 | spin_unlock(&pag->pag_buf_lock); |
| 856 | bp->b_relse(bp); |
Christoph Hellwig | 7f14d0a | 2005-11-02 15:09:35 +1100 | [diff] [blame] | 857 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 858 | ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q))); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 859 | rb_erase(&bp->b_rbnode, &pag->pag_buf_tree); |
| 860 | spin_unlock(&pag->pag_buf_lock); |
| 861 | xfs_perag_put(pag); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 862 | xfs_buf_free(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | |
| 868 | /* |
| 869 | * Mutual exclusion on buffers. Locking model: |
| 870 | * |
| 871 | * Buffers associated with inodes for which buffer locking |
| 872 | * is not enabled are not protected by semaphores, and are |
| 873 | * assumed to be exclusively owned by the caller. There is a |
| 874 | * spinlock in the buffer, used by the caller when concurrent |
| 875 | * access is possible. |
| 876 | */ |
| 877 | |
| 878 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 879 | * Locks a buffer object, if it is not already locked. |
| 880 | * Note that this in no way locks the underlying pages, so it is only |
| 881 | * useful for synchronizing concurrent use of buffer objects, not for |
| 882 | * synchronizing independent access to the underlying pages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | */ |
| 884 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 885 | xfs_buf_cond_lock( |
| 886 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | { |
| 888 | int locked; |
| 889 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 890 | locked = down_trylock(&bp->b_sema) == 0; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 891 | if (locked) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 892 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 893 | |
| 894 | trace_xfs_buf_cond_lock(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 895 | return locked ? 0 : -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 899 | xfs_buf_lock_value( |
| 900 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
Stephen Rothwell | adaa693 | 2008-04-22 15:26:13 +1000 | [diff] [blame] | 902 | return bp->b_sema.count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 906 | * Locks a buffer object. |
| 907 | * Note that this in no way locks the underlying pages, so it is only |
| 908 | * useful for synchronizing concurrent use of buffer objects, not for |
| 909 | * synchronizing independent access to the underlying pages. |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 910 | * |
| 911 | * If we come across a stale, pinned, locked buffer, we know that we |
| 912 | * are being asked to lock a buffer that has been reallocated. Because |
| 913 | * it is pinned, we know that the log has not been pushed to disk and |
| 914 | * hence it will still be locked. Rather than sleeping until someone |
| 915 | * 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] | 916 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 917 | void |
| 918 | xfs_buf_lock( |
| 919 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 921 | trace_xfs_buf_lock(bp, _RET_IP_); |
| 922 | |
Dave Chinner | ed3b4d6 | 2010-05-21 12:07:08 +1000 | [diff] [blame] | 923 | if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE)) |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 924 | xfs_log_force(bp->b_target->bt_mount, 0); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 925 | if (atomic_read(&bp->b_io_remaining)) |
| 926 | blk_run_address_space(bp->b_target->bt_mapping); |
| 927 | down(&bp->b_sema); |
| 928 | XB_SET_OWNER(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 929 | |
| 930 | trace_xfs_buf_lock_done(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
| 932 | |
| 933 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 934 | * Releases the lock on the buffer object. |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 935 | * If the buffer is marked delwri but is not queued, do so before we |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 936 | * unlock the buffer as we need to set flags correctly. We also need to |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 937 | * take a reference for the delwri queue because the unlocker is going to |
| 938 | * drop their's and they don't know we just queued it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | */ |
| 940 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 941 | xfs_buf_unlock( |
| 942 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 944 | if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) { |
| 945 | atomic_inc(&bp->b_hold); |
| 946 | bp->b_flags |= XBF_ASYNC; |
| 947 | xfs_buf_delwri_queue(bp, 0); |
David Chinner | 2f92658 | 2005-09-05 08:33:35 +1000 | [diff] [blame] | 948 | } |
| 949 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 950 | XB_CLEAR_OWNER(bp); |
| 951 | up(&bp->b_sema); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 952 | |
| 953 | trace_xfs_buf_unlock(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | } |
| 955 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 956 | STATIC void |
| 957 | xfs_buf_wait_unpin( |
| 958 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | { |
| 960 | DECLARE_WAITQUEUE (wait, current); |
| 961 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 962 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | return; |
| 964 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 965 | add_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | for (;;) { |
| 967 | set_current_state(TASK_UNINTERRUPTIBLE); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 968 | if (atomic_read(&bp->b_pin_count) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 970 | if (atomic_read(&bp->b_io_remaining)) |
| 971 | blk_run_address_space(bp->b_target->bt_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | schedule(); |
| 973 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 974 | remove_wait_queue(&bp->b_waiters, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | set_current_state(TASK_RUNNING); |
| 976 | } |
| 977 | |
| 978 | /* |
| 979 | * Buffer Utility Routines |
| 980 | */ |
| 981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 983 | xfs_buf_iodone_work( |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 984 | struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 986 | xfs_buf_t *bp = |
| 987 | container_of(work, xfs_buf_t, b_iodone_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Christoph Hellwig | 80f6c29 | 2010-08-18 05:29:11 -0400 | [diff] [blame] | 989 | if (bp->b_iodone) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 990 | (*(bp->b_iodone))(bp); |
| 991 | else if (bp->b_flags & XBF_ASYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | xfs_buf_relse(bp); |
| 993 | } |
| 994 | |
| 995 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 996 | xfs_buf_ioend( |
| 997 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | int schedule) |
| 999 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1000 | trace_xfs_buf_iodone(bp, _RET_IP_); |
| 1001 | |
Lachlan McIlroy | 77be55a | 2007-11-23 16:31:00 +1100 | [diff] [blame] | 1002 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1003 | if (bp->b_error == 0) |
| 1004 | bp->b_flags |= XBF_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1006 | if ((bp->b_iodone) || (bp->b_flags & XBF_ASYNC)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | if (schedule) { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1008 | INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1009 | queue_work(xfslogd_workqueue, &bp->b_iodone_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } else { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1011 | xfs_buf_iodone_work(&bp->b_iodone_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | } |
| 1013 | } else { |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 1014 | complete(&bp->b_iowait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | } |
| 1016 | } |
| 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1019 | xfs_buf_ioerror( |
| 1020 | xfs_buf_t *bp, |
| 1021 | int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | { |
| 1023 | ASSERT(error >= 0 && error <= 0xffff); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1024 | bp->b_error = (unsigned short)error; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1025 | trace_xfs_buf_ioerror(bp, error, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | int |
Christoph Hellwig | 64e0bc7 | 2010-01-13 22:17:58 +0000 | [diff] [blame] | 1029 | xfs_bwrite( |
| 1030 | struct xfs_mount *mp, |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 1031 | struct xfs_buf *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | { |
Christoph Hellwig | 8c38366 | 2010-03-12 10:59:40 +0000 | [diff] [blame] | 1033 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Christoph Hellwig | 64e0bc7 | 2010-01-13 22:17:58 +0000 | [diff] [blame] | 1035 | bp->b_flags |= XBF_WRITE; |
Christoph Hellwig | 8c38366 | 2010-03-12 10:59:40 +0000 | [diff] [blame] | 1036 | bp->b_flags &= ~(XBF_ASYNC | XBF_READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 1038 | xfs_buf_delwri_dequeue(bp); |
Christoph Hellwig | 939d723 | 2010-07-20 17:51:16 +1000 | [diff] [blame] | 1039 | xfs_bdstrat_cb(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
Christoph Hellwig | 8c38366 | 2010-03-12 10:59:40 +0000 | [diff] [blame] | 1041 | error = xfs_buf_iowait(bp); |
| 1042 | if (error) |
| 1043 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); |
| 1044 | xfs_buf_relse(bp); |
Christoph Hellwig | 64e0bc7 | 2010-01-13 22:17:58 +0000 | [diff] [blame] | 1045 | return error; |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 1048 | void |
| 1049 | xfs_bdwrite( |
| 1050 | void *mp, |
| 1051 | struct xfs_buf *bp) |
| 1052 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1053 | trace_xfs_buf_bdwrite(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | |
Christoph Hellwig | 5d765b9 | 2008-12-03 12:20:26 +0100 | [diff] [blame] | 1055 | bp->b_flags &= ~XBF_READ; |
| 1056 | bp->b_flags |= (XBF_DELWRI | XBF_ASYNC); |
| 1057 | |
| 1058 | xfs_buf_delwri_queue(bp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | } |
| 1060 | |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1061 | /* |
| 1062 | * 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] | 1063 | * 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] | 1064 | * so that the proper iodone callbacks get called. |
| 1065 | */ |
| 1066 | STATIC int |
| 1067 | xfs_bioerror( |
| 1068 | xfs_buf_t *bp) |
| 1069 | { |
| 1070 | #ifdef XFSERRORDEBUG |
| 1071 | ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone); |
| 1072 | #endif |
| 1073 | |
| 1074 | /* |
| 1075 | * No need to wait until the buffer is unpinned, we aren't flushing it. |
| 1076 | */ |
| 1077 | XFS_BUF_ERROR(bp, EIO); |
| 1078 | |
| 1079 | /* |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1080 | * We're calling xfs_buf_ioend, so delete XBF_DONE flag. |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1081 | */ |
| 1082 | XFS_BUF_UNREAD(bp); |
| 1083 | XFS_BUF_UNDELAYWRITE(bp); |
| 1084 | XFS_BUF_UNDONE(bp); |
| 1085 | XFS_BUF_STALE(bp); |
| 1086 | |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1087 | xfs_buf_ioend(bp, 0); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1088 | |
| 1089 | return EIO; |
| 1090 | } |
| 1091 | |
| 1092 | /* |
| 1093 | * Same as xfs_bioerror, except that we are releasing the buffer |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1094 | * here ourselves, and avoiding the xfs_buf_ioend call. |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1095 | * This is meant for userdata errors; metadata bufs come with |
| 1096 | * iodone functions attached, so that we can track down errors. |
| 1097 | */ |
| 1098 | STATIC int |
| 1099 | xfs_bioerror_relse( |
| 1100 | struct xfs_buf *bp) |
| 1101 | { |
| 1102 | int64_t fl = XFS_BUF_BFLAGS(bp); |
| 1103 | /* |
| 1104 | * No need to wait until the buffer is unpinned. |
| 1105 | * We aren't flushing it. |
| 1106 | * |
| 1107 | * chunkhold expects B_DONE to be set, whether |
| 1108 | * we actually finish the I/O or not. We don't want to |
| 1109 | * change that interface. |
| 1110 | */ |
| 1111 | XFS_BUF_UNREAD(bp); |
| 1112 | XFS_BUF_UNDELAYWRITE(bp); |
| 1113 | XFS_BUF_DONE(bp); |
| 1114 | XFS_BUF_STALE(bp); |
| 1115 | XFS_BUF_CLR_IODONE_FUNC(bp); |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 1116 | if (!(fl & XBF_ASYNC)) { |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 1117 | /* |
| 1118 | * Mark b_error and B_ERROR _both_. |
| 1119 | * Lot's of chunkcache code assumes that. |
| 1120 | * There's no reason to mark error for |
| 1121 | * ASYNC buffers. |
| 1122 | */ |
| 1123 | XFS_BUF_ERROR(bp, EIO); |
| 1124 | XFS_BUF_FINISH_IOWAIT(bp); |
| 1125 | } else { |
| 1126 | xfs_buf_relse(bp); |
| 1127 | } |
| 1128 | |
| 1129 | return EIO; |
| 1130 | } |
| 1131 | |
| 1132 | |
| 1133 | /* |
| 1134 | * All xfs metadata buffers except log state machine buffers |
| 1135 | * get this attached as their b_bdstrat callback function. |
| 1136 | * This is so that we can catch a buffer |
| 1137 | * after prematurely unpinning it to forcibly shutdown the filesystem. |
| 1138 | */ |
| 1139 | int |
| 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 | |
| 1160 | /* |
| 1161 | * Wrapper around bdstrat so that we can stop data from going to disk in case |
| 1162 | * we are shutting down the filesystem. Typically user data goes thru this |
| 1163 | * path; one of the exceptions is the superblock. |
| 1164 | */ |
| 1165 | void |
| 1166 | xfsbdstrat( |
| 1167 | struct xfs_mount *mp, |
| 1168 | struct xfs_buf *bp) |
| 1169 | { |
| 1170 | if (XFS_FORCED_SHUTDOWN(mp)) { |
| 1171 | trace_xfs_bdstrat_shut(bp, _RET_IP_); |
| 1172 | xfs_bioerror_relse(bp); |
| 1173 | return; |
| 1174 | } |
| 1175 | |
| 1176 | xfs_buf_iorequest(bp); |
| 1177 | } |
| 1178 | |
Christoph Hellwig | b8f82a4 | 2009-11-14 16:17:22 +0000 | [diff] [blame] | 1179 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1180 | _xfs_buf_ioend( |
| 1181 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | int schedule) |
| 1183 | { |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 1184 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { |
| 1185 | bp->b_flags &= ~_XBF_PAGE_LOCKED; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1186 | xfs_buf_ioend(bp, schedule); |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 1187 | } |
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; |
| 1196 | unsigned int blocksize = bp->b_target->bt_bsize; |
Nathan Scott | eedb553 | 2005-09-02 16:39:56 +1000 | [diff] [blame] | 1197 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
Lachlan McIlroy | cfbe526 | 2008-12-12 15:27:25 +1100 | [diff] [blame] | 1199 | xfs_buf_ioerror(bp, -error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 1201 | if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) |
| 1202 | invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); |
| 1203 | |
Nathan Scott | eedb553 | 2005-09-02 16:39:56 +1000 | [diff] [blame] | 1204 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | struct page *page = bvec->bv_page; |
| 1206 | |
Nathan Scott | 948ecdb | 2006-09-28 11:03:13 +1000 | [diff] [blame] | 1207 | ASSERT(!PagePrivate(page)); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1208 | if (unlikely(bp->b_error)) { |
| 1209 | if (bp->b_flags & XBF_READ) |
Nathan Scott | eedb553 | 2005-09-02 16:39:56 +1000 | [diff] [blame] | 1210 | ClearPageUptodate(page); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1211 | } else if (blocksize >= PAGE_CACHE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | SetPageUptodate(page); |
| 1213 | } else if (!PagePrivate(page) && |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1214 | (bp->b_flags & _XBF_PAGE_CACHE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | set_page_region(page, bvec->bv_offset, bvec->bv_len); |
| 1216 | } |
| 1217 | |
Nathan Scott | eedb553 | 2005-09-02 16:39:56 +1000 | [diff] [blame] | 1218 | if (--bvec >= bio->bi_io_vec) |
| 1219 | prefetchw(&bvec->bv_page->flags); |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 1220 | |
| 1221 | if (bp->b_flags & _XBF_PAGE_LOCKED) |
| 1222 | unlock_page(page); |
Nathan Scott | eedb553 | 2005-09-02 16:39:56 +1000 | [diff] [blame] | 1223 | } while (bvec >= bio->bi_io_vec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1225 | _xfs_buf_ioend(bp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
| 1229 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1230 | _xfs_buf_ioapply( |
| 1231 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | { |
Christoph Hellwig | a9759f2 | 2007-12-07 14:07:08 +1100 | [diff] [blame] | 1233 | int rw, map_i, total_nr_pages, nr_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | struct bio *bio; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1235 | int offset = bp->b_offset; |
| 1236 | int size = bp->b_count_desired; |
| 1237 | sector_t sector = bp->b_bn; |
| 1238 | unsigned int blocksize = bp->b_target->bt_bsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1240 | total_nr_pages = bp->b_page_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | map_i = 0; |
| 1242 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1243 | if (bp->b_flags & XBF_ORDERED) { |
| 1244 | ASSERT(!(bp->b_flags & XBF_READ)); |
Christoph Hellwig | 80f6c29 | 2010-08-18 05:29:11 -0400 | [diff] [blame] | 1245 | rw = WRITE_FLUSH_FUA; |
Dave Chinner | 2ee1aba | 2009-11-24 18:03:15 +0000 | [diff] [blame] | 1246 | } else if (bp->b_flags & XBF_LOG_BUFFER) { |
Nathan Scott | 51bdd70 | 2006-09-28 11:01:57 +1000 | [diff] [blame] | 1247 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); |
| 1248 | bp->b_flags &= ~_XBF_RUN_QUEUES; |
| 1249 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_SYNC : READ_SYNC; |
Dave Chinner | 2ee1aba | 2009-11-24 18:03:15 +0000 | [diff] [blame] | 1250 | } else if (bp->b_flags & _XBF_RUN_QUEUES) { |
| 1251 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); |
| 1252 | bp->b_flags &= ~_XBF_RUN_QUEUES; |
| 1253 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_META : READ_META; |
Nathan Scott | 51bdd70 | 2006-09-28 11:01:57 +1000 | [diff] [blame] | 1254 | } else { |
| 1255 | rw = (bp->b_flags & XBF_WRITE) ? WRITE : |
| 1256 | (bp->b_flags & XBF_READ_AHEAD) ? READA : READ; |
Christoph Hellwig | f538d4d | 2005-11-02 10:26:59 +1100 | [diff] [blame] | 1257 | } |
| 1258 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1259 | /* Special code path for reading a sub page size buffer in -- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | * we populate up the whole page, and hence the other metadata |
| 1261 | * in the same page. This optimization is only valid when the |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1262 | * filesystem block size is not smaller than the page size. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1264 | if ((bp->b_buffer_length < PAGE_CACHE_SIZE) && |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 1265 | ((bp->b_flags & (XBF_READ|_XBF_PAGE_LOCKED)) == |
| 1266 | (XBF_READ|_XBF_PAGE_LOCKED)) && |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1267 | (blocksize >= PAGE_CACHE_SIZE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | bio = bio_alloc(GFP_NOIO, 1); |
| 1269 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1270 | bio->bi_bdev = bp->b_target->bt_bdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | bio->bi_sector = sector - (offset >> BBSHIFT); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1272 | bio->bi_end_io = xfs_buf_bio_end_io; |
| 1273 | bio->bi_private = bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1275 | bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | size = 0; |
| 1277 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1278 | atomic_inc(&bp->b_io_remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
| 1280 | goto submit_io; |
| 1281 | } |
| 1282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | next_chunk: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1284 | atomic_inc(&bp->b_io_remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); |
| 1286 | if (nr_pages > total_nr_pages) |
| 1287 | nr_pages = total_nr_pages; |
| 1288 | |
| 1289 | bio = bio_alloc(GFP_NOIO, nr_pages); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1290 | bio->bi_bdev = bp->b_target->bt_bdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | bio->bi_sector = sector; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1292 | bio->bi_end_io = xfs_buf_bio_end_io; |
| 1293 | bio->bi_private = bp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | for (; size && nr_pages; nr_pages--, map_i++) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1296 | int rbytes, nbytes = PAGE_CACHE_SIZE - offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
| 1298 | if (nbytes > size) |
| 1299 | nbytes = size; |
| 1300 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1301 | rbytes = bio_add_page(bio, bp->b_pages[map_i], nbytes, offset); |
| 1302 | if (rbytes < nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | break; |
| 1304 | |
| 1305 | offset = 0; |
| 1306 | sector += nbytes >> BBSHIFT; |
| 1307 | size -= nbytes; |
| 1308 | total_nr_pages--; |
| 1309 | } |
| 1310 | |
| 1311 | submit_io: |
| 1312 | if (likely(bio->bi_size)) { |
James Bottomley | 73c77e2 | 2010-01-25 11:42:24 -0600 | [diff] [blame] | 1313 | if (xfs_buf_is_vmapped(bp)) { |
| 1314 | flush_kernel_vmap_range(bp->b_addr, |
| 1315 | xfs_buf_vmap_len(bp)); |
| 1316 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | submit_bio(rw, bio); |
| 1318 | if (size) |
| 1319 | goto next_chunk; |
| 1320 | } else { |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 1321 | /* |
| 1322 | * if we get here, no pages were added to the bio. However, |
| 1323 | * we can't just error out here - if the pages are locked then |
| 1324 | * we have to unlock them otherwise we can hang on a later |
| 1325 | * access to the page. |
| 1326 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1327 | xfs_buf_ioerror(bp, EIO); |
Dave Chinner | ec53d1d | 2010-07-20 17:52:59 +1000 | [diff] [blame] | 1328 | if (bp->b_flags & _XBF_PAGE_LOCKED) { |
| 1329 | int i; |
| 1330 | for (i = 0; i < bp->b_page_count; i++) |
| 1331 | unlock_page(bp->b_pages[i]); |
| 1332 | } |
| 1333 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | } |
| 1335 | } |
| 1336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1338 | xfs_buf_iorequest( |
| 1339 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1341 | trace_xfs_buf_iorequest(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1343 | if (bp->b_flags & XBF_DELWRI) { |
| 1344 | xfs_buf_delwri_queue(bp, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | return 0; |
| 1346 | } |
| 1347 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1348 | if (bp->b_flags & XBF_WRITE) { |
| 1349 | xfs_buf_wait_unpin(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1352 | xfs_buf_hold(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | |
| 1354 | /* Set the count to 1 initially, this will stop an I/O |
| 1355 | * completion callout which happens before we have started |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1356 | * all the I/O from calling xfs_buf_ioend too early. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1358 | atomic_set(&bp->b_io_remaining, 1); |
| 1359 | _xfs_buf_ioapply(bp); |
| 1360 | _xfs_buf_ioend(bp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1362 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | return 0; |
| 1364 | } |
| 1365 | |
| 1366 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1367 | * Waits for I/O to complete on the buffer supplied. |
| 1368 | * It returns immediately if no I/O is pending. |
| 1369 | * It returns the I/O error code, if any, or 0 if there was no error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | */ |
| 1371 | int |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1372 | xfs_buf_iowait( |
| 1373 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1375 | trace_xfs_buf_iowait(bp, _RET_IP_); |
| 1376 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1377 | if (atomic_read(&bp->b_io_remaining)) |
| 1378 | blk_run_address_space(bp->b_target->bt_mapping); |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 1379 | wait_for_completion(&bp->b_iowait); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1380 | |
| 1381 | trace_xfs_buf_iowait_done(bp, _RET_IP_); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1382 | return bp->b_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
| 1384 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1385 | xfs_caddr_t |
| 1386 | xfs_buf_offset( |
| 1387 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | size_t offset) |
| 1389 | { |
| 1390 | struct page *page; |
| 1391 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1392 | if (bp->b_flags & XBF_MAPPED) |
| 1393 | return XFS_BUF_PTR(bp) + offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1395 | offset += bp->b_offset; |
| 1396 | page = bp->b_pages[offset >> PAGE_CACHE_SHIFT]; |
| 1397 | return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | } |
| 1399 | |
| 1400 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | * Move data into or out of a buffer. |
| 1402 | */ |
| 1403 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1404 | xfs_buf_iomove( |
| 1405 | xfs_buf_t *bp, /* buffer to process */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | size_t boff, /* starting buffer offset */ |
| 1407 | size_t bsize, /* length to copy */ |
Dave Chinner | b9c4864 | 2010-01-20 10:47:39 +1100 | [diff] [blame] | 1408 | void *data, /* data address */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1409 | xfs_buf_rw_t mode) /* read/write/zero flag */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | { |
| 1411 | size_t bend, cpoff, csize; |
| 1412 | struct page *page; |
| 1413 | |
| 1414 | bend = boff + bsize; |
| 1415 | while (boff < bend) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1416 | page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)]; |
| 1417 | cpoff = xfs_buf_poff(boff + bp->b_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | csize = min_t(size_t, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1419 | PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
| 1421 | ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE)); |
| 1422 | |
| 1423 | switch (mode) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1424 | case XBRW_ZERO: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | memset(page_address(page) + cpoff, 0, csize); |
| 1426 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1427 | case XBRW_READ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | memcpy(data, page_address(page) + cpoff, csize); |
| 1429 | break; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1430 | case XBRW_WRITE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | memcpy(page_address(page) + cpoff, data, csize); |
| 1432 | } |
| 1433 | |
| 1434 | boff += csize; |
| 1435 | data += csize; |
| 1436 | } |
| 1437 | } |
| 1438 | |
| 1439 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1440 | * Handling of buffer targets (buftargs). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | */ |
| 1442 | |
| 1443 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1444 | * Wait for any bufs with callbacks that have been submitted but |
| 1445 | * have not yet returned... walk the hash list for the target. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | */ |
| 1447 | void |
| 1448 | xfs_wait_buftarg( |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 1449 | struct xfs_buftarg *btp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | { |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 1451 | struct xfs_perag *pag; |
| 1452 | uint i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 1454 | for (i = 0; i < btp->bt_mount->m_sb.sb_agcount; i++) { |
| 1455 | pag = xfs_perag_get(btp->bt_mount, i); |
| 1456 | spin_lock(&pag->pag_buf_lock); |
| 1457 | while (rb_first(&pag->pag_buf_tree)) { |
| 1458 | spin_unlock(&pag->pag_buf_lock); |
Dave Chinner | 26af655 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1459 | delay(100); |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 1460 | spin_lock(&pag->pag_buf_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | } |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 1462 | spin_unlock(&pag->pag_buf_lock); |
| 1463 | xfs_perag_put(pag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | } |
| 1465 | } |
| 1466 | |
| 1467 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1468 | * buftarg list for delwrite queue processing |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1469 | */ |
Tim Shimmin | e6a0e9c | 2007-05-08 13:49:59 +1000 | [diff] [blame] | 1470 | static LIST_HEAD(xfs_buftarg_list); |
David Chinner | 7989cb8 | 2007-02-10 18:34:56 +1100 | [diff] [blame] | 1471 | static DEFINE_SPINLOCK(xfs_buftarg_lock); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1472 | |
| 1473 | STATIC void |
| 1474 | xfs_register_buftarg( |
| 1475 | xfs_buftarg_t *btp) |
| 1476 | { |
| 1477 | spin_lock(&xfs_buftarg_lock); |
| 1478 | list_add(&btp->bt_list, &xfs_buftarg_list); |
| 1479 | spin_unlock(&xfs_buftarg_lock); |
| 1480 | } |
| 1481 | |
| 1482 | STATIC void |
| 1483 | xfs_unregister_buftarg( |
| 1484 | xfs_buftarg_t *btp) |
| 1485 | { |
| 1486 | spin_lock(&xfs_buftarg_lock); |
| 1487 | list_del(&btp->bt_list); |
| 1488 | spin_unlock(&xfs_buftarg_lock); |
| 1489 | } |
| 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | void |
| 1492 | xfs_free_buftarg( |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1493 | struct xfs_mount *mp, |
| 1494 | struct xfs_buftarg *btp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | { |
| 1496 | xfs_flush_buftarg(btp, 1); |
Christoph Hellwig | b796313 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 1497 | if (mp->m_flags & XFS_MOUNT_BARRIER) |
| 1498 | xfs_blkdev_issue_flush(btp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1499 | iput(btp->bt_mapping->host); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1500 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1501 | /* Unregister the buftarg first so that we don't get a |
| 1502 | * wakeup finding a non-existent task |
| 1503 | */ |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1504 | xfs_unregister_buftarg(btp); |
| 1505 | kthread_stop(btp->bt_task); |
| 1506 | |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1507 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | } |
| 1509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | STATIC int |
| 1511 | xfs_setsize_buftarg_flags( |
| 1512 | xfs_buftarg_t *btp, |
| 1513 | unsigned int blocksize, |
| 1514 | unsigned int sectorsize, |
| 1515 | int verbose) |
| 1516 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1517 | btp->bt_bsize = blocksize; |
| 1518 | btp->bt_sshift = ffs(sectorsize) - 1; |
| 1519 | btp->bt_smask = sectorsize - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1521 | if (set_blocksize(btp->bt_bdev, sectorsize)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | printk(KERN_WARNING |
| 1523 | "XFS: Cannot set_blocksize to %u on device %s\n", |
| 1524 | sectorsize, XFS_BUFTARG_NAME(btp)); |
| 1525 | return EINVAL; |
| 1526 | } |
| 1527 | |
| 1528 | if (verbose && |
| 1529 | (PAGE_CACHE_SIZE / BITS_PER_LONG) > sectorsize) { |
| 1530 | printk(KERN_WARNING |
| 1531 | "XFS: %u byte sectors in use on device %s. " |
| 1532 | "This is suboptimal; %u or greater is ideal.\n", |
| 1533 | sectorsize, XFS_BUFTARG_NAME(btp), |
| 1534 | (unsigned int)PAGE_CACHE_SIZE / BITS_PER_LONG); |
| 1535 | } |
| 1536 | |
| 1537 | return 0; |
| 1538 | } |
| 1539 | |
| 1540 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1541 | * When allocating the initial buffer target we have not yet |
| 1542 | * read in the superblock, so don't know what sized sectors |
| 1543 | * are being used is at this early stage. Play safe. |
| 1544 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | STATIC int |
| 1546 | xfs_setsize_buftarg_early( |
| 1547 | xfs_buftarg_t *btp, |
| 1548 | struct block_device *bdev) |
| 1549 | { |
| 1550 | return xfs_setsize_buftarg_flags(btp, |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1551 | PAGE_CACHE_SIZE, bdev_logical_block_size(bdev), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
| 1553 | |
| 1554 | int |
| 1555 | xfs_setsize_buftarg( |
| 1556 | xfs_buftarg_t *btp, |
| 1557 | unsigned int blocksize, |
| 1558 | unsigned int sectorsize) |
| 1559 | { |
| 1560 | return xfs_setsize_buftarg_flags(btp, blocksize, sectorsize, 1); |
| 1561 | } |
| 1562 | |
| 1563 | STATIC int |
| 1564 | xfs_mapping_buftarg( |
| 1565 | xfs_buftarg_t *btp, |
| 1566 | struct block_device *bdev) |
| 1567 | { |
| 1568 | struct backing_dev_info *bdi; |
| 1569 | struct inode *inode; |
| 1570 | struct address_space *mapping; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1571 | static const struct address_space_operations mapping_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | .sync_page = block_sync_page, |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 1573 | .migratepage = fail_migrate_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | }; |
| 1575 | |
| 1576 | inode = new_inode(bdev->bd_inode->i_sb); |
| 1577 | if (!inode) { |
| 1578 | printk(KERN_WARNING |
| 1579 | "XFS: Cannot allocate mapping inode for device %s\n", |
| 1580 | XFS_BUFTARG_NAME(btp)); |
| 1581 | return ENOMEM; |
| 1582 | } |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1583 | inode->i_ino = get_next_ino(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | inode->i_mode = S_IFBLK; |
| 1585 | inode->i_bdev = bdev; |
| 1586 | inode->i_rdev = bdev->bd_dev; |
| 1587 | bdi = blk_get_backing_dev_info(bdev); |
| 1588 | if (!bdi) |
| 1589 | bdi = &default_backing_dev_info; |
| 1590 | mapping = &inode->i_data; |
| 1591 | mapping->a_ops = &mapping_aops; |
| 1592 | mapping->backing_dev_info = bdi; |
| 1593 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1594 | btp->bt_mapping = mapping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | return 0; |
| 1596 | } |
| 1597 | |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1598 | STATIC int |
| 1599 | xfs_alloc_delwrite_queue( |
Jan Engelhardt | e2a0781 | 2010-03-23 09:52:55 +1100 | [diff] [blame] | 1600 | xfs_buftarg_t *btp, |
| 1601 | const char *fsname) |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1602 | { |
| 1603 | int error = 0; |
| 1604 | |
| 1605 | INIT_LIST_HEAD(&btp->bt_list); |
| 1606 | INIT_LIST_HEAD(&btp->bt_delwrite_queue); |
Eric Sandeen | 007c61c | 2007-10-11 17:43:56 +1000 | [diff] [blame] | 1607 | spin_lock_init(&btp->bt_delwrite_lock); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1608 | btp->bt_flags = 0; |
Jan Engelhardt | e2a0781 | 2010-03-23 09:52:55 +1100 | [diff] [blame] | 1609 | btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd/%s", fsname); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1610 | if (IS_ERR(btp->bt_task)) { |
| 1611 | error = PTR_ERR(btp->bt_task); |
| 1612 | goto out_error; |
| 1613 | } |
| 1614 | xfs_register_buftarg(btp); |
| 1615 | out_error: |
| 1616 | return error; |
| 1617 | } |
| 1618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | xfs_buftarg_t * |
| 1620 | xfs_alloc_buftarg( |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1621 | struct xfs_mount *mp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | struct block_device *bdev, |
Jan Engelhardt | e2a0781 | 2010-03-23 09:52:55 +1100 | [diff] [blame] | 1623 | int external, |
| 1624 | const char *fsname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | { |
| 1626 | xfs_buftarg_t *btp; |
| 1627 | |
| 1628 | btp = kmem_zalloc(sizeof(*btp), KM_SLEEP); |
| 1629 | |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 1630 | btp->bt_mount = mp; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1631 | btp->bt_dev = bdev->bd_dev; |
| 1632 | btp->bt_bdev = bdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | if (xfs_setsize_buftarg_early(btp, bdev)) |
| 1634 | goto error; |
| 1635 | if (xfs_mapping_buftarg(btp, bdev)) |
| 1636 | goto error; |
Jan Engelhardt | e2a0781 | 2010-03-23 09:52:55 +1100 | [diff] [blame] | 1637 | if (xfs_alloc_delwrite_queue(btp, fsname)) |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1638 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | return btp; |
| 1640 | |
| 1641 | error: |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 1642 | kmem_free(btp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | return NULL; |
| 1644 | } |
| 1645 | |
| 1646 | |
| 1647 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1648 | * Delayed write buffer handling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1651 | xfs_buf_delwri_queue( |
| 1652 | xfs_buf_t *bp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | int unlock) |
| 1654 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1655 | struct list_head *dwq = &bp->b_target->bt_delwrite_queue; |
| 1656 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1657 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1658 | trace_xfs_buf_delwri_queue(bp, _RET_IP_); |
| 1659 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1660 | ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1662 | spin_lock(dwlk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | /* If already in the queue, dequeue and place at tail */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1664 | if (!list_empty(&bp->b_list)) { |
| 1665 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); |
| 1666 | if (unlock) |
| 1667 | atomic_dec(&bp->b_hold); |
| 1668 | list_del(&bp->b_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | } |
| 1670 | |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1671 | if (list_empty(dwq)) { |
| 1672 | /* start xfsbufd as it is about to have something to do */ |
| 1673 | wake_up_process(bp->b_target->bt_task); |
| 1674 | } |
| 1675 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1676 | bp->b_flags |= _XBF_DELWRI_Q; |
| 1677 | list_add_tail(&bp->b_list, dwq); |
| 1678 | bp->b_queuetime = jiffies; |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1679 | spin_unlock(dwlk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
| 1681 | if (unlock) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1682 | xfs_buf_unlock(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | } |
| 1684 | |
| 1685 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1686 | xfs_buf_delwri_dequeue( |
| 1687 | xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1689 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | int dequeued = 0; |
| 1691 | |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1692 | spin_lock(dwlk); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1693 | if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) { |
| 1694 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); |
| 1695 | list_del_init(&bp->b_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | dequeued = 1; |
| 1697 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1698 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1699 | spin_unlock(dwlk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | |
| 1701 | if (dequeued) |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1702 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1704 | trace_xfs_buf_delwri_dequeue(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | } |
| 1706 | |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 1707 | /* |
| 1708 | * If a delwri buffer needs to be pushed before it has aged out, then promote |
| 1709 | * it to the head of the delwri queue so that it will be flushed on the next |
| 1710 | * xfsbufd run. We do this by resetting the queuetime of the buffer to be older |
| 1711 | * than the age currently needed to flush the buffer. Hence the next time the |
| 1712 | * xfsbufd sees it is guaranteed to be considered old enough to flush. |
| 1713 | */ |
| 1714 | void |
| 1715 | xfs_buf_delwri_promote( |
| 1716 | struct xfs_buf *bp) |
| 1717 | { |
| 1718 | struct xfs_buftarg *btp = bp->b_target; |
| 1719 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10) + 1; |
| 1720 | |
| 1721 | ASSERT(bp->b_flags & XBF_DELWRI); |
| 1722 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); |
| 1723 | |
| 1724 | /* |
| 1725 | * Check the buffer age before locking the delayed write queue as we |
| 1726 | * don't need to promote buffers that are already past the flush age. |
| 1727 | */ |
| 1728 | if (bp->b_queuetime < jiffies - age) |
| 1729 | return; |
| 1730 | bp->b_queuetime = jiffies - age; |
| 1731 | spin_lock(&btp->bt_delwrite_lock); |
| 1732 | list_move(&bp->b_list, &btp->bt_delwrite_queue); |
| 1733 | spin_unlock(&btp->bt_delwrite_lock); |
| 1734 | } |
| 1735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | STATIC void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1737 | xfs_buf_runall_queues( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | struct workqueue_struct *queue) |
| 1739 | { |
| 1740 | flush_workqueue(queue); |
| 1741 | } |
| 1742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | STATIC int |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1744 | xfsbufd_wakeup( |
Dave Chinner | 7f8275d | 2010-07-19 14:56:17 +1000 | [diff] [blame] | 1745 | struct shrinker *shrink, |
Nathan Scott | 15c84a4 | 2005-11-04 10:51:01 +1100 | [diff] [blame] | 1746 | int priority, |
| 1747 | gfp_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | { |
Christoph Hellwig | da7f93e | 2006-01-11 20:49:57 +1100 | [diff] [blame] | 1749 | xfs_buftarg_t *btp; |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1750 | |
| 1751 | spin_lock(&xfs_buftarg_lock); |
Christoph Hellwig | da7f93e | 2006-01-11 20:49:57 +1100 | [diff] [blame] | 1752 | list_for_each_entry(btp, &xfs_buftarg_list, bt_list) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1753 | if (test_bit(XBT_FORCE_SLEEP, &btp->bt_flags)) |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1754 | continue; |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1755 | if (list_empty(&btp->bt_delwrite_queue)) |
| 1756 | continue; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1757 | set_bit(XBT_FORCE_FLUSH, &btp->bt_flags); |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 1758 | wake_up_process(btp->bt_task); |
| 1759 | } |
| 1760 | spin_unlock(&xfs_buftarg_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | return 0; |
| 1762 | } |
| 1763 | |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1764 | /* |
| 1765 | * Move as many buffers as specified to the supplied list |
| 1766 | * idicating if we skipped any buffers to prevent deadlocks. |
| 1767 | */ |
| 1768 | STATIC int |
| 1769 | xfs_buf_delwri_split( |
| 1770 | xfs_buftarg_t *target, |
| 1771 | struct list_head *list, |
David Chinner | 5e6a07d | 2007-02-10 18:34:49 +1100 | [diff] [blame] | 1772 | unsigned long age) |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1773 | { |
| 1774 | xfs_buf_t *bp, *n; |
| 1775 | struct list_head *dwq = &target->bt_delwrite_queue; |
| 1776 | spinlock_t *dwlk = &target->bt_delwrite_lock; |
| 1777 | int skipped = 0; |
David Chinner | 5e6a07d | 2007-02-10 18:34:49 +1100 | [diff] [blame] | 1778 | int force; |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1779 | |
David Chinner | 5e6a07d | 2007-02-10 18:34:49 +1100 | [diff] [blame] | 1780 | force = test_and_clear_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1781 | INIT_LIST_HEAD(list); |
| 1782 | spin_lock(dwlk); |
| 1783 | list_for_each_entry_safe(bp, n, dwq, b_list) { |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1784 | ASSERT(bp->b_flags & XBF_DELWRI); |
| 1785 | |
Christoph Hellwig | 4d16e92 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 1786 | if (!XFS_BUF_ISPINNED(bp) && !xfs_buf_cond_lock(bp)) { |
David Chinner | 5e6a07d | 2007-02-10 18:34:49 +1100 | [diff] [blame] | 1787 | if (!force && |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1788 | time_before(jiffies, bp->b_queuetime + age)) { |
| 1789 | xfs_buf_unlock(bp); |
| 1790 | break; |
| 1791 | } |
| 1792 | |
| 1793 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q| |
| 1794 | _XBF_RUN_QUEUES); |
| 1795 | bp->b_flags |= XBF_WRITE; |
| 1796 | list_move_tail(&bp->b_list, list); |
Dave Chinner | bfe2741 | 2010-11-08 08:55:05 +0000 | [diff] [blame^] | 1797 | trace_xfs_buf_delwri_split(bp, _RET_IP_); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1798 | } else |
| 1799 | skipped++; |
| 1800 | } |
| 1801 | spin_unlock(dwlk); |
| 1802 | |
| 1803 | return skipped; |
| 1804 | |
| 1805 | } |
| 1806 | |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1807 | /* |
| 1808 | * Compare function is more complex than it needs to be because |
| 1809 | * the return value is only 32 bits and we are doing comparisons |
| 1810 | * on 64 bit values |
| 1811 | */ |
| 1812 | static int |
| 1813 | xfs_buf_cmp( |
| 1814 | void *priv, |
| 1815 | struct list_head *a, |
| 1816 | struct list_head *b) |
| 1817 | { |
| 1818 | struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list); |
| 1819 | struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list); |
| 1820 | xfs_daddr_t diff; |
| 1821 | |
| 1822 | diff = ap->b_bn - bp->b_bn; |
| 1823 | if (diff < 0) |
| 1824 | return -1; |
| 1825 | if (diff > 0) |
| 1826 | return 1; |
| 1827 | return 0; |
| 1828 | } |
| 1829 | |
| 1830 | void |
| 1831 | xfs_buf_delwri_sort( |
| 1832 | xfs_buftarg_t *target, |
| 1833 | struct list_head *list) |
| 1834 | { |
| 1835 | list_sort(NULL, list, xfs_buf_cmp); |
| 1836 | } |
| 1837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | STATIC int |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1839 | xfsbufd( |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1840 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | { |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1842 | xfs_buftarg_t *target = (xfs_buftarg_t *)data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | current->flags |= PF_MEMALLOC; |
| 1845 | |
Rafael J. Wysocki | 978c7b2 | 2007-12-07 14:09:02 +1100 | [diff] [blame] | 1846 | set_freezable(); |
| 1847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | do { |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1849 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10); |
| 1850 | long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1851 | int count = 0; |
| 1852 | struct list_head tmp; |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1853 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 1854 | if (unlikely(freezing(current))) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1855 | set_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 1856 | refrigerator(); |
Nathan Scott | abd0cf7 | 2005-05-05 13:30:13 -0700 | [diff] [blame] | 1857 | } else { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1858 | clear_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
Nathan Scott | abd0cf7 | 2005-05-05 13:30:13 -0700 | [diff] [blame] | 1859 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1861 | /* sleep for a long time if there is nothing to do. */ |
| 1862 | if (list_empty(&target->bt_delwrite_queue)) |
| 1863 | tout = MAX_SCHEDULE_TIMEOUT; |
| 1864 | schedule_timeout_interruptible(tout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | |
Dave Chinner | c9c1297 | 2010-01-11 11:49:59 +0000 | [diff] [blame] | 1866 | xfs_buf_delwri_split(target, &tmp, age); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1867 | list_sort(NULL, &tmp, xfs_buf_cmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | while (!list_empty(&tmp)) { |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1869 | struct xfs_buf *bp; |
| 1870 | bp = list_first_entry(&tmp, struct xfs_buf, b_list); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1871 | list_del_init(&bp->b_list); |
Christoph Hellwig | 939d723 | 2010-07-20 17:51:16 +1000 | [diff] [blame] | 1872 | xfs_bdstrat_cb(bp); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1873 | count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | } |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 1875 | if (count) |
| 1876 | blk_run_address_space(target->bt_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | |
Christoph Hellwig | 4df08c5 | 2005-09-05 08:34:18 +1000 | [diff] [blame] | 1878 | } while (!kthread_should_stop()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | |
Christoph Hellwig | 4df08c5 | 2005-09-05 08:34:18 +1000 | [diff] [blame] | 1880 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | } |
| 1882 | |
| 1883 | /* |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1884 | * Go through all incore buffers, and release buffers if they belong to |
| 1885 | * the given device. This is used in filesystem error handling to |
| 1886 | * preserve the consistency of its metadata. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | */ |
| 1888 | int |
| 1889 | xfs_flush_buftarg( |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1890 | xfs_buftarg_t *target, |
| 1891 | int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | { |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1893 | xfs_buf_t *bp; |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1894 | int pincount = 0; |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1895 | LIST_HEAD(tmp_list); |
| 1896 | LIST_HEAD(wait_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 1898 | xfs_buf_runall_queues(xfsconvertd_workqueue); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1899 | xfs_buf_runall_queues(xfsdatad_workqueue); |
| 1900 | xfs_buf_runall_queues(xfslogd_workqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
David Chinner | 5e6a07d | 2007-02-10 18:34:49 +1100 | [diff] [blame] | 1902 | set_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1903 | pincount = xfs_buf_delwri_split(target, &tmp_list, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | |
| 1905 | /* |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1906 | * Dropped the delayed write list lock, now walk the temporary list. |
| 1907 | * All I/O is issued async and then if we need to wait for completion |
| 1908 | * we do that after issuing all the IO. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | */ |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1910 | list_sort(NULL, &tmp_list, xfs_buf_cmp); |
| 1911 | while (!list_empty(&tmp_list)) { |
| 1912 | bp = list_first_entry(&tmp_list, struct xfs_buf, b_list); |
David Chinner | 585e6d8 | 2007-02-10 18:32:29 +1100 | [diff] [blame] | 1913 | ASSERT(target == bp->b_target); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1914 | list_del_init(&bp->b_list); |
| 1915 | if (wait) { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1916 | bp->b_flags &= ~XBF_ASYNC; |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1917 | list_add(&bp->b_list, &wait_list); |
| 1918 | } |
Christoph Hellwig | 939d723 | 2010-07-20 17:51:16 +1000 | [diff] [blame] | 1919 | xfs_bdstrat_cb(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | } |
| 1921 | |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1922 | if (wait) { |
| 1923 | /* Expedite and wait for IO to complete. */ |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 1924 | blk_run_address_space(target->bt_mapping); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1925 | while (!list_empty(&wait_list)) { |
| 1926 | bp = list_first_entry(&wait_list, struct xfs_buf, b_list); |
Nathan Scott | f07c225 | 2006-09-28 10:52:15 +1000 | [diff] [blame] | 1927 | |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1928 | list_del_init(&bp->b_list); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 1929 | xfs_buf_iowait(bp); |
Dave Chinner | 089716a | 2010-01-26 15:13:25 +1100 | [diff] [blame] | 1930 | xfs_buf_relse(bp); |
| 1931 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | } |
| 1933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | return pincount; |
| 1935 | } |
| 1936 | |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1937 | int __init |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1938 | xfs_buf_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | { |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1940 | xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", |
| 1941 | KM_ZONE_HWALIGN, NULL); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1942 | if (!xfs_buf_zone) |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1943 | goto out; |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1944 | |
Dave Chinner | 51749e4 | 2010-09-08 09:00:22 +0000 | [diff] [blame] | 1945 | xfslogd_workqueue = alloc_workqueue("xfslogd", |
Tejun Heo | 6370a6a | 2010-10-11 15:12:27 +0200 | [diff] [blame] | 1946 | WQ_MEM_RECLAIM | WQ_HIGHPRI, 1); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1947 | if (!xfslogd_workqueue) |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1948 | goto out_free_buf_zone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | |
Rafael J. Wysocki | b433769 | 2007-03-22 00:11:27 -0800 | [diff] [blame] | 1950 | xfsdatad_workqueue = create_workqueue("xfsdatad"); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1951 | if (!xfsdatad_workqueue) |
| 1952 | goto out_destroy_xfslogd_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 1954 | xfsconvertd_workqueue = create_workqueue("xfsconvertd"); |
| 1955 | if (!xfsconvertd_workqueue) |
| 1956 | goto out_destroy_xfsdatad_workqueue; |
| 1957 | |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 1958 | register_shrinker(&xfs_buf_shake); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1959 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 1961 | out_destroy_xfsdatad_workqueue: |
| 1962 | destroy_workqueue(xfsdatad_workqueue); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1963 | out_destroy_xfslogd_workqueue: |
| 1964 | destroy_workqueue(xfslogd_workqueue); |
Christoph Hellwig | 23ea403 | 2005-06-21 15:14:01 +1000 | [diff] [blame] | 1965 | out_free_buf_zone: |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1966 | kmem_zone_destroy(xfs_buf_zone); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 1967 | out: |
Nathan Scott | 8758280 | 2006-03-14 13:18:19 +1100 | [diff] [blame] | 1968 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | void |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1972 | xfs_buf_terminate(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | { |
Rusty Russell | 8e1f936 | 2007-07-17 04:03:17 -0700 | [diff] [blame] | 1974 | unregister_shrinker(&xfs_buf_shake); |
Dave Chinner | c626d17 | 2009-04-06 18:42:11 +0200 | [diff] [blame] | 1975 | destroy_workqueue(xfsconvertd_workqueue); |
Christoph Hellwig | 04d8b28 | 2005-11-02 10:15:05 +1100 | [diff] [blame] | 1976 | destroy_workqueue(xfsdatad_workqueue); |
| 1977 | destroy_workqueue(xfslogd_workqueue); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 1978 | kmem_zone_destroy(xfs_buf_zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | } |
Tim Shimmin | e6a0e9c | 2007-05-08 13:49:59 +1000 | [diff] [blame] | 1980 | |
| 1981 | #ifdef CONFIG_KDB_MODULES |
| 1982 | struct list_head * |
| 1983 | xfs_get_buftarg_list(void) |
| 1984 | { |
| 1985 | return &xfs_buftarg_list; |
| 1986 | } |
| 1987 | #endif |