Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "xfs_types.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 21 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 23 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "xfs_trans.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "xfs_sb.h" |
| 26 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "xfs_mount.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 28 | #include "xfs_bmap_btree.h" |
| 29 | #include "xfs_alloc_btree.h" |
| 30 | #include "xfs_ialloc_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 31 | #include "xfs_dinode.h" |
| 32 | #include "xfs_inode.h" |
| 33 | #include "xfs_buf_item.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_trans_priv.h" |
| 35 | #include "xfs_error.h" |
| 36 | #include "xfs_rw.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 37 | #include "xfs_trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 39 | /* |
| 40 | * Check to see if a buffer matching the given parameters is already |
| 41 | * a part of the given transaction. |
| 42 | */ |
| 43 | STATIC struct xfs_buf * |
| 44 | xfs_trans_buf_item_match( |
| 45 | struct xfs_trans *tp, |
| 46 | struct xfs_buftarg *target, |
| 47 | xfs_daddr_t blkno, |
| 48 | int len) |
| 49 | { |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 50 | struct xfs_log_item_desc *lidp; |
| 51 | struct xfs_buf_log_item *blip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 53 | len = BBTOB(len); |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 54 | list_for_each_entry(lidp, &tp->t_items, lid_trans) { |
| 55 | blip = (struct xfs_buf_log_item *)lidp->lid_item; |
| 56 | if (blip->bli_item.li_type == XFS_LI_BUF && |
Chandra Seetharaman | 49074c0 | 2011-07-22 23:40:40 +0000 | [diff] [blame] | 57 | blip->bli_buf->b_target == target && |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 58 | XFS_BUF_ADDR(blip->bli_buf) == blkno && |
| 59 | XFS_BUF_COUNT(blip->bli_buf) == len) |
| 60 | return blip->bli_buf; |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | return NULL; |
| 64 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 66 | /* |
| 67 | * Add the locked buffer to the transaction. |
| 68 | * |
| 69 | * The buffer must be locked, and it cannot be associated with any |
| 70 | * transaction. |
| 71 | * |
| 72 | * If the buffer does not yet have a buf log item associated with it, |
| 73 | * then allocate one for it. Then add the buf item to the transaction. |
| 74 | */ |
| 75 | STATIC void |
| 76 | _xfs_trans_bjoin( |
| 77 | struct xfs_trans *tp, |
| 78 | struct xfs_buf *bp, |
| 79 | int reset_recur) |
| 80 | { |
| 81 | struct xfs_buf_log_item *bip; |
| 82 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 83 | ASSERT(bp->b_transp == NULL); |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 84 | |
| 85 | /* |
| 86 | * The xfs_buf_log_item pointer is stored in b_fsprivate. If |
| 87 | * it doesn't have one yet, then allocate one and initialize it. |
| 88 | * The checks to see if one is there are in xfs_buf_item_init(). |
| 89 | */ |
| 90 | xfs_buf_item_init(bp, tp->t_mountp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 91 | bip = bp->b_fspriv; |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 92 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 93 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 94 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); |
| 95 | if (reset_recur) |
| 96 | bip->bli_recur = 0; |
| 97 | |
| 98 | /* |
| 99 | * Take a reference for this transaction on the buf item. |
| 100 | */ |
| 101 | atomic_inc(&bip->bli_refcount); |
| 102 | |
| 103 | /* |
| 104 | * Get a log_item_desc to point at the new item. |
| 105 | */ |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 106 | xfs_trans_add_item(tp, &bip->bli_item); |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 107 | |
| 108 | /* |
| 109 | * Initialize b_fsprivate2 so we can find it with incore_match() |
| 110 | * in xfs_trans_get_buf() and friends above. |
| 111 | */ |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 112 | bp->b_transp = tp; |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 113 | |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | xfs_trans_bjoin( |
| 118 | struct xfs_trans *tp, |
| 119 | struct xfs_buf *bp) |
| 120 | { |
| 121 | _xfs_trans_bjoin(tp, bp, 0); |
| 122 | trace_xfs_trans_bjoin(bp->b_fspriv); |
| 123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | /* |
| 126 | * Get and lock the buffer for the caller if it is not already |
| 127 | * locked within the given transaction. If it is already locked |
| 128 | * within the transaction, just increment its lock recursion count |
| 129 | * and return a pointer to it. |
| 130 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | * If the transaction pointer is NULL, make this just a normal |
| 132 | * get_buf() call. |
| 133 | */ |
| 134 | xfs_buf_t * |
| 135 | xfs_trans_get_buf(xfs_trans_t *tp, |
| 136 | xfs_buftarg_t *target_dev, |
| 137 | xfs_daddr_t blkno, |
| 138 | int len, |
| 139 | uint flags) |
| 140 | { |
| 141 | xfs_buf_t *bp; |
| 142 | xfs_buf_log_item_t *bip; |
| 143 | |
| 144 | if (flags == 0) |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 145 | flags = XBF_LOCK | XBF_MAPPED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | /* |
| 148 | * Default to a normal get_buf() call if the tp is NULL. |
| 149 | */ |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 150 | if (tp == NULL) |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 151 | return xfs_buf_get(target_dev, blkno, len, |
| 152 | flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | /* |
| 155 | * If we find the buffer in the cache with this transaction |
| 156 | * pointer in its b_fsprivate2 field, then we know we already |
| 157 | * have it locked. In this case we just increment the lock |
| 158 | * recursion count and return the buffer to the caller. |
| 159 | */ |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 160 | bp = xfs_trans_buf_item_match(tp, target_dev, blkno, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | if (bp != NULL) { |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 162 | ASSERT(xfs_buf_islocked(bp)); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 163 | if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | XFS_BUF_SUPER_STALE(bp); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* |
| 167 | * If the buffer is stale then it was binval'ed |
| 168 | * since last read. This doesn't matter since the |
| 169 | * caller isn't allowed to use the data anyway. |
| 170 | */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 171 | else if (XFS_BUF_ISSTALE(bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | ASSERT(!XFS_BUF_ISDELAYWRITE(bp)); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 173 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 174 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 175 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | ASSERT(bip != NULL); |
| 177 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 178 | bip->bli_recur++; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 179 | trace_xfs_trans_get_buf_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | return (bp); |
| 181 | } |
| 182 | |
| 183 | /* |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 184 | * We always specify the XBF_DONT_BLOCK flag within a transaction |
| 185 | * so that get_buf does not try to push out a delayed write buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | * which might cause another transaction to take place (if the |
| 187 | * buffer was delayed alloc). Such recursive transactions can |
| 188 | * easily deadlock with our current transaction as well as cause |
| 189 | * us to run out of stack space. |
| 190 | */ |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 191 | bp = xfs_buf_get(target_dev, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (bp == NULL) { |
| 193 | return NULL; |
| 194 | } |
| 195 | |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 196 | ASSERT(!bp->b_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 198 | _xfs_trans_bjoin(tp, bp, 1); |
| 199 | trace_xfs_trans_get_buf(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return (bp); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Get and lock the superblock buffer of this file system for the |
| 205 | * given transaction. |
| 206 | * |
| 207 | * We don't need to use incore_match() here, because the superblock |
| 208 | * buffer is a private buffer which we keep a pointer to in the |
| 209 | * mount structure. |
| 210 | */ |
| 211 | xfs_buf_t * |
| 212 | xfs_trans_getsb(xfs_trans_t *tp, |
| 213 | struct xfs_mount *mp, |
| 214 | int flags) |
| 215 | { |
| 216 | xfs_buf_t *bp; |
| 217 | xfs_buf_log_item_t *bip; |
| 218 | |
| 219 | /* |
| 220 | * Default to just trying to lock the superblock buffer |
| 221 | * if tp is NULL. |
| 222 | */ |
| 223 | if (tp == NULL) { |
| 224 | return (xfs_getsb(mp, flags)); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * If the superblock buffer already has this transaction |
| 229 | * pointer in its b_fsprivate2 field, then we know we already |
| 230 | * have it locked. In this case we just increment the lock |
| 231 | * recursion count and return the buffer to the caller. |
| 232 | */ |
| 233 | bp = mp->m_sb_bp; |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 234 | if (bp->b_transp == tp) { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 235 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | ASSERT(bip != NULL); |
| 237 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 238 | bip->bli_recur++; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 239 | trace_xfs_trans_getsb_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | return (bp); |
| 241 | } |
| 242 | |
| 243 | bp = xfs_getsb(mp, flags); |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 244 | if (bp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 247 | _xfs_trans_bjoin(tp, bp, 1); |
| 248 | trace_xfs_trans_getsb(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | return (bp); |
| 250 | } |
| 251 | |
| 252 | #ifdef DEBUG |
| 253 | xfs_buftarg_t *xfs_error_target; |
| 254 | int xfs_do_error; |
| 255 | int xfs_req_num; |
| 256 | int xfs_error_mod = 33; |
| 257 | #endif |
| 258 | |
| 259 | /* |
| 260 | * Get and lock the buffer for the caller if it is not already |
| 261 | * locked within the given transaction. If it has not yet been |
| 262 | * read in, read it from disk. If it is already locked |
| 263 | * within the transaction and already read in, just increment its |
| 264 | * lock recursion count and return a pointer to it. |
| 265 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | * If the transaction pointer is NULL, make this just a normal |
| 267 | * read_buf() call. |
| 268 | */ |
| 269 | int |
| 270 | xfs_trans_read_buf( |
| 271 | xfs_mount_t *mp, |
| 272 | xfs_trans_t *tp, |
| 273 | xfs_buftarg_t *target, |
| 274 | xfs_daddr_t blkno, |
| 275 | int len, |
| 276 | uint flags, |
| 277 | xfs_buf_t **bpp) |
| 278 | { |
| 279 | xfs_buf_t *bp; |
| 280 | xfs_buf_log_item_t *bip; |
| 281 | int error; |
| 282 | |
| 283 | if (flags == 0) |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 284 | flags = XBF_LOCK | XBF_MAPPED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | /* |
| 287 | * Default to a normal get_buf() call if the tp is NULL. |
| 288 | */ |
| 289 | if (tp == NULL) { |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 290 | bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | if (!bp) |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 292 | return (flags & XBF_TRYLOCK) ? |
David Chinner | a3f74ff | 2008-03-06 13:43:42 +1100 | [diff] [blame] | 293 | EAGAIN : XFS_ERROR(ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 295 | if (bp->b_error) { |
| 296 | error = bp->b_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | xfs_ioerror_alert("xfs_trans_read_buf", mp, |
| 298 | bp, blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | xfs_buf_relse(bp); |
| 300 | return error; |
| 301 | } |
| 302 | #ifdef DEBUG |
Julia Lawall | a0f7bfd | 2009-07-27 18:15:25 +0200 | [diff] [blame] | 303 | if (xfs_do_error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | if (xfs_error_target == target) { |
| 305 | if (((xfs_req_num++) % xfs_error_mod) == 0) { |
| 306 | xfs_buf_relse(bp); |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 307 | xfs_debug(mp, "Returning error!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | return XFS_ERROR(EIO); |
| 309 | } |
| 310 | } |
| 311 | } |
| 312 | #endif |
| 313 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 314 | goto shutdown_abort; |
| 315 | *bpp = bp; |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * If we find the buffer in the cache with this transaction |
| 321 | * pointer in its b_fsprivate2 field, then we know we already |
| 322 | * have it locked. If it is already read in we just increment |
| 323 | * the lock recursion count and return the buffer to the caller. |
| 324 | * If the buffer is not yet read in, then we read it in, increment |
| 325 | * the lock recursion count, and return it to the caller. |
| 326 | */ |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 327 | bp = xfs_trans_buf_item_match(tp, target, blkno, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | if (bp != NULL) { |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 329 | ASSERT(xfs_buf_islocked(bp)); |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 330 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 331 | ASSERT(bp->b_fspriv != NULL); |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 332 | ASSERT(!bp->b_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | if (!(XFS_BUF_ISDONE(bp))) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 334 | trace_xfs_trans_read_buf_io(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | ASSERT(!XFS_BUF_ISASYNC(bp)); |
| 336 | XFS_BUF_READ(bp); |
| 337 | xfsbdstrat(tp->t_mountp, bp); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 338 | error = xfs_buf_iowait(bp); |
David Chinner | d64e31a | 2008-04-10 12:22:17 +1000 | [diff] [blame] | 339 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | xfs_ioerror_alert("xfs_trans_read_buf", mp, |
| 341 | bp, blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | xfs_buf_relse(bp); |
| 343 | /* |
David Chinner | d64e31a | 2008-04-10 12:22:17 +1000 | [diff] [blame] | 344 | * We can gracefully recover from most read |
| 345 | * errors. Ones we can't are those that happen |
| 346 | * after the transaction's already dirty. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | */ |
| 348 | if (tp->t_flags & XFS_TRANS_DIRTY) |
| 349 | xfs_force_shutdown(tp->t_mountp, |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 350 | SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | return error; |
| 352 | } |
| 353 | } |
| 354 | /* |
| 355 | * We never locked this buf ourselves, so we shouldn't |
| 356 | * brelse it either. Just get out. |
| 357 | */ |
| 358 | if (XFS_FORCED_SHUTDOWN(mp)) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 359 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | *bpp = NULL; |
| 361 | return XFS_ERROR(EIO); |
| 362 | } |
| 363 | |
| 364 | |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 365 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | bip->bli_recur++; |
| 367 | |
| 368 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 369 | trace_xfs_trans_read_buf_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | *bpp = bp; |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | /* |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 375 | * We always specify the XBF_DONT_BLOCK flag within a transaction |
| 376 | * so that get_buf does not try to push out a delayed write buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | * which might cause another transaction to take place (if the |
| 378 | * buffer was delayed alloc). Such recursive transactions can |
| 379 | * easily deadlock with our current transaction as well as cause |
| 380 | * us to run out of stack space. |
| 381 | */ |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 382 | bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (bp == NULL) { |
| 384 | *bpp = NULL; |
Dave Chinner | 7401aaf | 2011-03-26 09:14:44 +1100 | [diff] [blame] | 385 | return (flags & XBF_TRYLOCK) ? |
| 386 | 0 : XFS_ERROR(ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 388 | if (bp->b_error) { |
| 389 | error = bp->b_error; |
| 390 | XFS_BUF_SUPER_STALE(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | xfs_ioerror_alert("xfs_trans_read_buf", mp, |
| 392 | bp, blkno); |
| 393 | if (tp->t_flags & XFS_TRANS_DIRTY) |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 394 | xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | xfs_buf_relse(bp); |
| 396 | return error; |
| 397 | } |
| 398 | #ifdef DEBUG |
| 399 | if (xfs_do_error && !(tp->t_flags & XFS_TRANS_DIRTY)) { |
| 400 | if (xfs_error_target == target) { |
| 401 | if (((xfs_req_num++) % xfs_error_mod) == 0) { |
| 402 | xfs_force_shutdown(tp->t_mountp, |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 403 | SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | xfs_buf_relse(bp); |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 405 | xfs_debug(mp, "Returning trans error!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | return XFS_ERROR(EIO); |
| 407 | } |
| 408 | } |
| 409 | } |
| 410 | #endif |
| 411 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 412 | goto shutdown_abort; |
| 413 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 414 | _xfs_trans_bjoin(tp, bp, 1); |
| 415 | trace_xfs_trans_read_buf(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | *bpp = bp; |
| 418 | return 0; |
| 419 | |
| 420 | shutdown_abort: |
| 421 | /* |
| 422 | * the theory here is that buffer is good but we're |
| 423 | * bailing out because the filesystem is being forcibly |
| 424 | * shut down. So we should leave the b_flags alone since |
| 425 | * the buffer's not staled and just get out. |
| 426 | */ |
| 427 | #if defined(DEBUG) |
| 428 | if (XFS_BUF_ISSTALE(bp) && XFS_BUF_ISDELAYWRITE(bp)) |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 429 | xfs_notice(mp, "about to pop assert, bp == 0x%p", bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | #endif |
Chandra Seetharaman | ed43233 | 2011-07-22 23:39:39 +0000 | [diff] [blame] | 431 | ASSERT((bp->b_flags & (XBF_STALE|XBF_DELWRI)) != |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 432 | (XBF_STALE|XBF_DELWRI)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 434 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | xfs_buf_relse(bp); |
| 436 | *bpp = NULL; |
| 437 | return XFS_ERROR(EIO); |
| 438 | } |
| 439 | |
| 440 | |
| 441 | /* |
| 442 | * Release the buffer bp which was previously acquired with one of the |
| 443 | * xfs_trans_... buffer allocation routines if the buffer has not |
| 444 | * been modified within this transaction. If the buffer is modified |
| 445 | * within this transaction, do decrement the recursion count but do |
| 446 | * not release the buffer even if the count goes to 0. If the buffer is not |
| 447 | * modified within the transaction, decrement the recursion count and |
| 448 | * release the buffer if the recursion count goes to 0. |
| 449 | * |
| 450 | * If the buffer is to be released and it was not modified before |
| 451 | * this transaction began, then free the buf_log_item associated with it. |
| 452 | * |
| 453 | * If the transaction pointer is NULL, make this just a normal |
| 454 | * brelse() call. |
| 455 | */ |
| 456 | void |
| 457 | xfs_trans_brelse(xfs_trans_t *tp, |
| 458 | xfs_buf_t *bp) |
| 459 | { |
| 460 | xfs_buf_log_item_t *bip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | /* |
| 463 | * Default to a normal brelse() call if the tp is NULL. |
| 464 | */ |
| 465 | if (tp == NULL) { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 466 | struct xfs_log_item *lip = bp->b_fspriv; |
| 467 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 468 | ASSERT(bp->b_transp == NULL); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | /* |
| 471 | * If there's a buf log item attached to the buffer, |
| 472 | * then let the AIL know that the buffer is being |
| 473 | * unlocked. |
| 474 | */ |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 475 | if (lip != NULL && lip->li_type == XFS_LI_BUF) { |
| 476 | bip = bp->b_fspriv; |
| 477 | xfs_trans_unlocked_item(bip->bli_item.li_ailp, lip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | xfs_buf_relse(bp); |
| 480 | return; |
| 481 | } |
| 482 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 483 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 484 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | ASSERT(bip->bli_item.li_type == XFS_LI_BUF); |
| 486 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 487 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 489 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 490 | trace_xfs_trans_brelse(bip); |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* |
| 493 | * If the release is just for a recursive lock, |
| 494 | * then decrement the count and return. |
| 495 | */ |
| 496 | if (bip->bli_recur > 0) { |
| 497 | bip->bli_recur--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | return; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * If the buffer is dirty within this transaction, we can't |
| 503 | * release it until we commit. |
| 504 | */ |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 505 | if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | /* |
| 509 | * If the buffer has been invalidated, then we can't release |
| 510 | * it until the transaction commits to disk unless it is re-dirtied |
| 511 | * as part of this transaction. This prevents us from pulling |
| 512 | * the item from the AIL before we should. |
| 513 | */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 514 | if (bip->bli_flags & XFS_BLI_STALE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
| 517 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | /* |
| 520 | * Free up the log item descriptor tracking the released item. |
| 521 | */ |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 522 | xfs_trans_del_item(&bip->bli_item); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
| 524 | /* |
| 525 | * Clear the hold flag in the buf log item if it is set. |
| 526 | * We wouldn't want the next user of the buffer to |
| 527 | * get confused. |
| 528 | */ |
| 529 | if (bip->bli_flags & XFS_BLI_HOLD) { |
| 530 | bip->bli_flags &= ~XFS_BLI_HOLD; |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Drop our reference to the buf log item. |
| 535 | */ |
| 536 | atomic_dec(&bip->bli_refcount); |
| 537 | |
| 538 | /* |
| 539 | * If the buf item is not tracking data in the log, then |
| 540 | * we must free it before releasing the buffer back to the |
| 541 | * free pool. Before releasing the buffer to the free pool, |
| 542 | * clear the transaction pointer in b_fsprivate2 to dissolve |
| 543 | * its relation to this transaction. |
| 544 | */ |
| 545 | if (!xfs_buf_item_dirty(bip)) { |
| 546 | /*** |
| 547 | ASSERT(bp->b_pincount == 0); |
| 548 | ***/ |
| 549 | ASSERT(atomic_read(&bip->bli_refcount) == 0); |
| 550 | ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL)); |
| 551 | ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF)); |
| 552 | xfs_buf_item_relse(bp); |
| 553 | bip = NULL; |
| 554 | } |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 555 | bp->b_transp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | /* |
| 558 | * If we've still got a buf log item on the buffer, then |
| 559 | * tell the AIL that the buffer is being unlocked. |
| 560 | */ |
| 561 | if (bip != NULL) { |
David Chinner | 783a2f6 | 2008-10-30 17:39:58 +1100 | [diff] [blame] | 562 | xfs_trans_unlocked_item(bip->bli_item.li_ailp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | (xfs_log_item_t*)bip); |
| 564 | } |
| 565 | |
| 566 | xfs_buf_relse(bp); |
| 567 | return; |
| 568 | } |
| 569 | |
| 570 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | * Mark the buffer as not needing to be unlocked when the buf item's |
| 572 | * IOP_UNLOCK() routine is called. The buffer must already be locked |
| 573 | * and associated with the given transaction. |
| 574 | */ |
| 575 | /* ARGSUSED */ |
| 576 | void |
| 577 | xfs_trans_bhold(xfs_trans_t *tp, |
| 578 | xfs_buf_t *bp) |
| 579 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 580 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 582 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 583 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 585 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | bip->bli_flags |= XFS_BLI_HOLD; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 589 | trace_xfs_trans_bhold(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
| 591 | |
| 592 | /* |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 593 | * Cancel the previous buffer hold request made on this buffer |
| 594 | * for this transaction. |
| 595 | */ |
| 596 | void |
| 597 | xfs_trans_bhold_release(xfs_trans_t *tp, |
| 598 | xfs_buf_t *bp) |
| 599 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 600 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 601 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 602 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 603 | ASSERT(bip != NULL); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 604 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 605 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 606 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 607 | ASSERT(bip->bli_flags & XFS_BLI_HOLD); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 608 | |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 609 | bip->bli_flags &= ~XFS_BLI_HOLD; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 610 | trace_xfs_trans_bhold_release(bip); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | * This is called to mark bytes first through last inclusive of the given |
| 615 | * buffer as needing to be logged when the transaction is committed. |
| 616 | * The buffer must already be associated with the given transaction. |
| 617 | * |
| 618 | * First and last are numbers relative to the beginning of this buffer, |
| 619 | * so the first byte in the buffer is numbered 0 regardless of the |
| 620 | * value of b_blkno. |
| 621 | */ |
| 622 | void |
| 623 | xfs_trans_log_buf(xfs_trans_t *tp, |
| 624 | xfs_buf_t *bp, |
| 625 | uint first, |
| 626 | uint last) |
| 627 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 628 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 630 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 631 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | ASSERT((first <= last) && (last < XFS_BUF_COUNT(bp))); |
Christoph Hellwig | cb669ca | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 633 | ASSERT(bp->b_iodone == NULL || |
| 634 | bp->b_iodone == xfs_buf_iodone_callbacks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
| 636 | /* |
| 637 | * Mark the buffer as needing to be written out eventually, |
| 638 | * and set its iodone function to remove the buffer's buf log |
| 639 | * item from the AIL and free it when the buffer is flushed |
| 640 | * to disk. See xfs_buf_attach_iodone() for more details |
| 641 | * on li_cb and xfs_buf_iodone_callbacks(). |
| 642 | * If we end up aborting this transaction, we trap this buffer |
| 643 | * inside the b_bdstrat callback so that this won't get written to |
| 644 | * disk. |
| 645 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | XFS_BUF_DONE(bp); |
| 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | cb669ca | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 649 | bp->b_iodone = xfs_buf_iodone_callbacks; |
Christoph Hellwig | ca30b2a | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 650 | bip->bli_item.li_cb = xfs_buf_iodone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Christoph Hellwig | 61551f1 | 2011-08-23 08:28:06 +0000 | [diff] [blame] | 652 | xfs_buf_delwri_queue(bp); |
| 653 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 654 | trace_xfs_trans_log_buf(bip); |
| 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | /* |
| 657 | * If we invalidated the buffer within this transaction, then |
| 658 | * cancel the invalidation now that we're dirtying the buffer |
| 659 | * again. There are no races with the code in xfs_buf_item_unpin(), |
| 660 | * because we have a reference to the buffer this entire time. |
| 661 | */ |
| 662 | if (bip->bli_flags & XFS_BLI_STALE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | bip->bli_flags &= ~XFS_BLI_STALE; |
| 664 | ASSERT(XFS_BUF_ISSTALE(bp)); |
| 665 | XFS_BUF_UNSTALE(bp); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 666 | bip->bli_format.blf_flags &= ~XFS_BLF_CANCEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | tp->t_flags |= XFS_TRANS_DIRTY; |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 670 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | bip->bli_flags |= XFS_BLI_LOGGED; |
| 672 | xfs_buf_item_log(bip, first, last); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | |
| 676 | /* |
| 677 | * This called to invalidate a buffer that is being used within |
| 678 | * a transaction. Typically this is because the blocks in the |
| 679 | * buffer are being freed, so we need to prevent it from being |
| 680 | * written out when we're done. Allowing it to be written again |
| 681 | * might overwrite data in the free blocks if they are reallocated |
| 682 | * to a file. |
| 683 | * |
| 684 | * We prevent the buffer from being written out by clearing the |
| 685 | * B_DELWRI flag. We can't always |
| 686 | * get rid of the buf log item at this point, though, because |
| 687 | * the buffer may still be pinned by another transaction. If that |
| 688 | * is the case, then we'll wait until the buffer is committed to |
| 689 | * disk for the last time (we can tell by the ref count) and |
| 690 | * free it in xfs_buf_item_unpin(). Until it is cleaned up we |
| 691 | * will keep the buffer locked so that the buffer and buf log item |
| 692 | * are not reused. |
| 693 | */ |
| 694 | void |
| 695 | xfs_trans_binval( |
| 696 | xfs_trans_t *tp, |
| 697 | xfs_buf_t *bp) |
| 698 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 699 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 701 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 702 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 704 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 705 | trace_xfs_trans_binval(bip); |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | if (bip->bli_flags & XFS_BLI_STALE) { |
| 708 | /* |
| 709 | * If the buffer is already invalidated, then |
| 710 | * just return. |
| 711 | */ |
| 712 | ASSERT(!(XFS_BUF_ISDELAYWRITE(bp))); |
| 713 | ASSERT(XFS_BUF_ISSTALE(bp)); |
| 714 | ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY))); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 715 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF)); |
| 716 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 717 | ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | ASSERT(tp->t_flags & XFS_TRANS_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * Clear the dirty bit in the buffer and set the STALE flag |
| 724 | * in the buf log item. The STALE flag will be used in |
| 725 | * xfs_buf_item_unpin() to determine if it should clean up |
| 726 | * when the last reference to the buf item is given up. |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 727 | * We set the XFS_BLF_CANCEL flag in the buf log format structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | * and log the buf item. This will be used at recovery time |
| 729 | * to determine that copies of the buffer in the log before |
| 730 | * this should not be replayed. |
| 731 | * We mark the item descriptor and the transaction dirty so |
| 732 | * that we'll hold the buffer until after the commit. |
| 733 | * |
| 734 | * Since we're invalidating the buffer, we also clear the state |
| 735 | * about which parts of the buffer have been logged. We also |
| 736 | * clear the flag indicating that this is an inode buffer since |
| 737 | * the data in the buffer will no longer be valid. |
| 738 | * |
| 739 | * We set the stale bit in the buffer as well since we're getting |
| 740 | * rid of it. |
| 741 | */ |
Christoph Hellwig | 61551f1 | 2011-08-23 08:28:06 +0000 | [diff] [blame] | 742 | xfs_buf_delwri_dequeue(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | XFS_BUF_STALE(bp); |
| 744 | bip->bli_flags |= XFS_BLI_STALE; |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 745 | bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 746 | bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF; |
| 747 | bip->bli_format.blf_flags |= XFS_BLF_CANCEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | memset((char *)(bip->bli_format.blf_data_map), 0, |
| 749 | (bip->bli_format.blf_map_size * sizeof(uint))); |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 750 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | tp->t_flags |= XFS_TRANS_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | /* |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 755 | * This call is used to indicate that the buffer contains on-disk inodes which |
| 756 | * must be handled specially during recovery. They require special handling |
| 757 | * because only the di_next_unlinked from the inodes in the buffer should be |
| 758 | * recovered. The rest of the data in the buffer is logged via the inodes |
| 759 | * themselves. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | * |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 761 | * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be |
| 762 | * transferred to the buffer's log format structure so that we'll know what to |
| 763 | * do at recovery time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | void |
| 766 | xfs_trans_inode_buf( |
| 767 | xfs_trans_t *tp, |
| 768 | xfs_buf_t *bp) |
| 769 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 770 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 772 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 773 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 775 | |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 776 | bip->bli_flags |= XFS_BLI_INODE_BUF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
| 778 | |
| 779 | /* |
| 780 | * This call is used to indicate that the buffer is going to |
| 781 | * be staled and was an inode buffer. This means it gets |
| 782 | * special processing during unpin - where any inodes |
| 783 | * associated with the buffer should be removed from ail. |
| 784 | * There is also special processing during recovery, |
| 785 | * any replay of the inodes in the buffer needs to be |
| 786 | * prevented as the buffer may have been reused. |
| 787 | */ |
| 788 | void |
| 789 | xfs_trans_stale_inode_buf( |
| 790 | xfs_trans_t *tp, |
| 791 | xfs_buf_t *bp) |
| 792 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 793 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 795 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 796 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 798 | |
| 799 | bip->bli_flags |= XFS_BLI_STALE_INODE; |
Christoph Hellwig | ca30b2a | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 800 | bip->bli_item.li_cb = xfs_buf_iodone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
| 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | /* |
| 804 | * Mark the buffer as being one which contains newly allocated |
| 805 | * inodes. We need to make sure that even if this buffer is |
| 806 | * relogged as an 'inode buf' we still recover all of the inode |
| 807 | * images in the face of a crash. This works in coordination with |
| 808 | * xfs_buf_item_committed() to ensure that the buffer remains in the |
| 809 | * AIL at its original location even after it has been relogged. |
| 810 | */ |
| 811 | /* ARGSUSED */ |
| 812 | void |
| 813 | xfs_trans_inode_alloc_buf( |
| 814 | xfs_trans_t *tp, |
| 815 | xfs_buf_t *bp) |
| 816 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 817 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 819 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 820 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 822 | |
| 823 | bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF; |
| 824 | } |
| 825 | |
| 826 | |
| 827 | /* |
| 828 | * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of |
| 829 | * dquots. However, unlike in inode buffer recovery, dquot buffers get |
| 830 | * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag). |
| 831 | * The only thing that makes dquot buffers different from regular |
| 832 | * buffers is that we must not replay dquot bufs when recovering |
| 833 | * if a _corresponding_ quotaoff has happened. We also have to distinguish |
| 834 | * between usr dquot bufs and grp dquot bufs, because usr and grp quotas |
| 835 | * can be turned off independently. |
| 836 | */ |
| 837 | /* ARGSUSED */ |
| 838 | void |
| 839 | xfs_trans_dquot_buf( |
| 840 | xfs_trans_t *tp, |
| 841 | xfs_buf_t *bp, |
| 842 | uint type) |
| 843 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 844 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 846 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 847 | ASSERT(bip != NULL); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 848 | ASSERT(type == XFS_BLF_UDQUOT_BUF || |
| 849 | type == XFS_BLF_PDQUOT_BUF || |
| 850 | type == XFS_BLF_GDQUOT_BUF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 852 | |
| 853 | bip->bli_format.blf_flags |= type; |
| 854 | } |