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 && |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 59 | BBTOB(blip->bli_buf->b_length) == len) |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 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) |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 145 | flags = 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 | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 163 | if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) { |
| 164 | xfs_buf_stale(bp); |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 165 | XFS_BUF_DONE(bp); |
| 166 | } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 167 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 168 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 169 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | ASSERT(bip != NULL); |
| 171 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 172 | bip->bli_recur++; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 173 | trace_xfs_trans_get_buf_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | return (bp); |
| 175 | } |
| 176 | |
| 177 | /* |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 178 | * We always specify the XBF_DONT_BLOCK flag within a transaction |
| 179 | * 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] | 180 | * which might cause another transaction to take place (if the |
| 181 | * buffer was delayed alloc). Such recursive transactions can |
| 182 | * easily deadlock with our current transaction as well as cause |
| 183 | * us to run out of stack space. |
| 184 | */ |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 185 | bp = xfs_buf_get(target_dev, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (bp == NULL) { |
| 187 | return NULL; |
| 188 | } |
| 189 | |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 190 | ASSERT(!bp->b_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 192 | _xfs_trans_bjoin(tp, bp, 1); |
| 193 | trace_xfs_trans_get_buf(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | return (bp); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Get and lock the superblock buffer of this file system for the |
| 199 | * given transaction. |
| 200 | * |
| 201 | * We don't need to use incore_match() here, because the superblock |
| 202 | * buffer is a private buffer which we keep a pointer to in the |
| 203 | * mount structure. |
| 204 | */ |
| 205 | xfs_buf_t * |
| 206 | xfs_trans_getsb(xfs_trans_t *tp, |
| 207 | struct xfs_mount *mp, |
| 208 | int flags) |
| 209 | { |
| 210 | xfs_buf_t *bp; |
| 211 | xfs_buf_log_item_t *bip; |
| 212 | |
| 213 | /* |
| 214 | * Default to just trying to lock the superblock buffer |
| 215 | * if tp is NULL. |
| 216 | */ |
| 217 | if (tp == NULL) { |
| 218 | return (xfs_getsb(mp, flags)); |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * If the superblock buffer already has this transaction |
| 223 | * pointer in its b_fsprivate2 field, then we know we already |
| 224 | * have it locked. In this case we just increment the lock |
| 225 | * recursion count and return the buffer to the caller. |
| 226 | */ |
| 227 | bp = mp->m_sb_bp; |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 228 | if (bp->b_transp == tp) { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 229 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | ASSERT(bip != NULL); |
| 231 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 232 | bip->bli_recur++; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 233 | trace_xfs_trans_getsb_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | return (bp); |
| 235 | } |
| 236 | |
| 237 | bp = xfs_getsb(mp, flags); |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 238 | if (bp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 241 | _xfs_trans_bjoin(tp, bp, 1); |
| 242 | trace_xfs_trans_getsb(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return (bp); |
| 244 | } |
| 245 | |
| 246 | #ifdef DEBUG |
| 247 | xfs_buftarg_t *xfs_error_target; |
| 248 | int xfs_do_error; |
| 249 | int xfs_req_num; |
| 250 | int xfs_error_mod = 33; |
| 251 | #endif |
| 252 | |
| 253 | /* |
| 254 | * Get and lock the buffer for the caller if it is not already |
| 255 | * locked within the given transaction. If it has not yet been |
| 256 | * read in, read it from disk. If it is already locked |
| 257 | * within the transaction and already read in, just increment its |
| 258 | * lock recursion count and return a pointer to it. |
| 259 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | * If the transaction pointer is NULL, make this just a normal |
| 261 | * read_buf() call. |
| 262 | */ |
| 263 | int |
| 264 | xfs_trans_read_buf( |
| 265 | xfs_mount_t *mp, |
| 266 | xfs_trans_t *tp, |
| 267 | xfs_buftarg_t *target, |
| 268 | xfs_daddr_t blkno, |
| 269 | int len, |
| 270 | uint flags, |
| 271 | xfs_buf_t **bpp) |
| 272 | { |
| 273 | xfs_buf_t *bp; |
| 274 | xfs_buf_log_item_t *bip; |
| 275 | int error; |
| 276 | |
Dave Chinner | 7ca790a | 2012-04-23 15:58:55 +1000 | [diff] [blame^] | 277 | *bpp = NULL; |
| 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (flags == 0) |
Dave Chinner | a8acad7 | 2012-04-23 15:58:54 +1000 | [diff] [blame] | 280 | flags = XBF_MAPPED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | /* |
| 283 | * Default to a normal get_buf() call if the tp is NULL. |
| 284 | */ |
| 285 | if (tp == NULL) { |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 286 | bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | if (!bp) |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 288 | return (flags & XBF_TRYLOCK) ? |
David Chinner | a3f74ff | 2008-03-06 13:43:42 +1100 | [diff] [blame] | 289 | EAGAIN : XFS_ERROR(ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 291 | if (bp->b_error) { |
| 292 | error = bp->b_error; |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 293 | xfs_buf_ioerror_alert(bp, __func__); |
Dave Chinner | 7ca790a | 2012-04-23 15:58:55 +1000 | [diff] [blame^] | 294 | XFS_BUF_UNDONE(bp); |
| 295 | xfs_buf_stale(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | xfs_buf_relse(bp); |
| 297 | return error; |
| 298 | } |
| 299 | #ifdef DEBUG |
Julia Lawall | a0f7bfd | 2009-07-27 18:15:25 +0200 | [diff] [blame] | 300 | if (xfs_do_error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if (xfs_error_target == target) { |
| 302 | if (((xfs_req_num++) % xfs_error_mod) == 0) { |
| 303 | xfs_buf_relse(bp); |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 304 | xfs_debug(mp, "Returning error!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | return XFS_ERROR(EIO); |
| 306 | } |
| 307 | } |
| 308 | } |
| 309 | #endif |
| 310 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 311 | goto shutdown_abort; |
| 312 | *bpp = bp; |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * If we find the buffer in the cache with this transaction |
| 318 | * pointer in its b_fsprivate2 field, then we know we already |
| 319 | * have it locked. If it is already read in we just increment |
| 320 | * the lock recursion count and return the buffer to the caller. |
| 321 | * If the buffer is not yet read in, then we read it in, increment |
| 322 | * the lock recursion count, and return it to the caller. |
| 323 | */ |
Christoph Hellwig | 4a5224d | 2010-04-18 00:10:45 +0000 | [diff] [blame] | 324 | bp = xfs_trans_buf_item_match(tp, target, blkno, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | if (bp != NULL) { |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 326 | ASSERT(xfs_buf_islocked(bp)); |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 327 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 328 | ASSERT(bp->b_fspriv != NULL); |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 329 | ASSERT(!bp->b_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (!(XFS_BUF_ISDONE(bp))) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 331 | trace_xfs_trans_read_buf_io(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | ASSERT(!XFS_BUF_ISASYNC(bp)); |
| 333 | XFS_BUF_READ(bp); |
| 334 | xfsbdstrat(tp->t_mountp, bp); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 335 | error = xfs_buf_iowait(bp); |
David Chinner | d64e31a | 2008-04-10 12:22:17 +1000 | [diff] [blame] | 336 | if (error) { |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 337 | xfs_buf_ioerror_alert(bp, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | xfs_buf_relse(bp); |
| 339 | /* |
David Chinner | d64e31a | 2008-04-10 12:22:17 +1000 | [diff] [blame] | 340 | * We can gracefully recover from most read |
| 341 | * errors. Ones we can't are those that happen |
| 342 | * after the transaction's already dirty. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | */ |
| 344 | if (tp->t_flags & XFS_TRANS_DIRTY) |
| 345 | xfs_force_shutdown(tp->t_mountp, |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 346 | SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | return error; |
| 348 | } |
| 349 | } |
| 350 | /* |
| 351 | * We never locked this buf ourselves, so we shouldn't |
| 352 | * brelse it either. Just get out. |
| 353 | */ |
| 354 | if (XFS_FORCED_SHUTDOWN(mp)) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 355 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | *bpp = NULL; |
| 357 | return XFS_ERROR(EIO); |
| 358 | } |
| 359 | |
| 360 | |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 361 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | bip->bli_recur++; |
| 363 | |
| 364 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 365 | trace_xfs_trans_read_buf_recur(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | *bpp = bp; |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | /* |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 371 | * We always specify the XBF_DONT_BLOCK flag within a transaction |
| 372 | * 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] | 373 | * which might cause another transaction to take place (if the |
| 374 | * buffer was delayed alloc). Such recursive transactions can |
| 375 | * easily deadlock with our current transaction as well as cause |
| 376 | * us to run out of stack space. |
| 377 | */ |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 378 | bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | if (bp == NULL) { |
| 380 | *bpp = NULL; |
Dave Chinner | 7401aaf | 2011-03-26 09:14:44 +1100 | [diff] [blame] | 381 | return (flags & XBF_TRYLOCK) ? |
| 382 | 0 : XFS_ERROR(ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 384 | if (bp->b_error) { |
| 385 | error = bp->b_error; |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 386 | xfs_buf_stale(bp); |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 387 | XFS_BUF_DONE(bp); |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 388 | xfs_buf_ioerror_alert(bp, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | if (tp->t_flags & XFS_TRANS_DIRTY) |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 390 | xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | xfs_buf_relse(bp); |
| 392 | return error; |
| 393 | } |
| 394 | #ifdef DEBUG |
| 395 | if (xfs_do_error && !(tp->t_flags & XFS_TRANS_DIRTY)) { |
| 396 | if (xfs_error_target == target) { |
| 397 | if (((xfs_req_num++) % xfs_error_mod) == 0) { |
| 398 | xfs_force_shutdown(tp->t_mountp, |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 399 | SHUTDOWN_META_IO_ERROR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | xfs_buf_relse(bp); |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 401 | xfs_debug(mp, "Returning trans error!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | return XFS_ERROR(EIO); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | #endif |
| 407 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 408 | goto shutdown_abort; |
| 409 | |
Christoph Hellwig | d7e84f4 | 2010-02-15 23:35:09 +0000 | [diff] [blame] | 410 | _xfs_trans_bjoin(tp, bp, 1); |
| 411 | trace_xfs_trans_read_buf(bp->b_fspriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | *bpp = bp; |
| 414 | return 0; |
| 415 | |
| 416 | shutdown_abort: |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 417 | trace_xfs_trans_read_buf_shut(bp, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | xfs_buf_relse(bp); |
| 419 | *bpp = NULL; |
| 420 | return XFS_ERROR(EIO); |
| 421 | } |
| 422 | |
| 423 | |
| 424 | /* |
| 425 | * Release the buffer bp which was previously acquired with one of the |
| 426 | * xfs_trans_... buffer allocation routines if the buffer has not |
| 427 | * been modified within this transaction. If the buffer is modified |
| 428 | * within this transaction, do decrement the recursion count but do |
| 429 | * not release the buffer even if the count goes to 0. If the buffer is not |
| 430 | * modified within the transaction, decrement the recursion count and |
| 431 | * release the buffer if the recursion count goes to 0. |
| 432 | * |
| 433 | * If the buffer is to be released and it was not modified before |
| 434 | * this transaction began, then free the buf_log_item associated with it. |
| 435 | * |
| 436 | * If the transaction pointer is NULL, make this just a normal |
| 437 | * brelse() call. |
| 438 | */ |
| 439 | void |
| 440 | xfs_trans_brelse(xfs_trans_t *tp, |
| 441 | xfs_buf_t *bp) |
| 442 | { |
| 443 | xfs_buf_log_item_t *bip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | /* |
| 446 | * Default to a normal brelse() call if the tp is NULL. |
| 447 | */ |
| 448 | if (tp == NULL) { |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 449 | ASSERT(bp->b_transp == NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | xfs_buf_relse(bp); |
| 451 | return; |
| 452 | } |
| 453 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 454 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 455 | bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | ASSERT(bip->bli_item.li_type == XFS_LI_BUF); |
| 457 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 458 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 460 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 461 | trace_xfs_trans_brelse(bip); |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /* |
| 464 | * If the release is just for a recursive lock, |
| 465 | * then decrement the count and return. |
| 466 | */ |
| 467 | if (bip->bli_recur > 0) { |
| 468 | bip->bli_recur--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | return; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * If the buffer is dirty within this transaction, we can't |
| 474 | * release it until we commit. |
| 475 | */ |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 476 | if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | /* |
| 480 | * If the buffer has been invalidated, then we can't release |
| 481 | * it until the transaction commits to disk unless it is re-dirtied |
| 482 | * as part of this transaction. This prevents us from pulling |
| 483 | * the item from the AIL before we should. |
| 484 | */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 485 | if (bip->bli_flags & XFS_BLI_STALE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * Free up the log item descriptor tracking the released item. |
| 492 | */ |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 493 | xfs_trans_del_item(&bip->bli_item); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | /* |
| 496 | * Clear the hold flag in the buf log item if it is set. |
| 497 | * We wouldn't want the next user of the buffer to |
| 498 | * get confused. |
| 499 | */ |
| 500 | if (bip->bli_flags & XFS_BLI_HOLD) { |
| 501 | bip->bli_flags &= ~XFS_BLI_HOLD; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * Drop our reference to the buf log item. |
| 506 | */ |
| 507 | atomic_dec(&bip->bli_refcount); |
| 508 | |
| 509 | /* |
| 510 | * If the buf item is not tracking data in the log, then |
| 511 | * we must free it before releasing the buffer back to the |
| 512 | * free pool. Before releasing the buffer to the free pool, |
| 513 | * clear the transaction pointer in b_fsprivate2 to dissolve |
| 514 | * its relation to this transaction. |
| 515 | */ |
| 516 | if (!xfs_buf_item_dirty(bip)) { |
| 517 | /*** |
| 518 | ASSERT(bp->b_pincount == 0); |
| 519 | ***/ |
| 520 | ASSERT(atomic_read(&bip->bli_refcount) == 0); |
| 521 | ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL)); |
| 522 | ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF)); |
| 523 | xfs_buf_item_relse(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
Christoph Hellwig | 5b03ff1 | 2012-02-20 02:31:22 +0000 | [diff] [blame] | 525 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 526 | bp->b_transp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | xfs_buf_relse(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | * Mark the buffer as not needing to be unlocked when the buf item's |
| 532 | * IOP_UNLOCK() routine is called. The buffer must already be locked |
| 533 | * and associated with the given transaction. |
| 534 | */ |
| 535 | /* ARGSUSED */ |
| 536 | void |
| 537 | xfs_trans_bhold(xfs_trans_t *tp, |
| 538 | xfs_buf_t *bp) |
| 539 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 540 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 542 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 543 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 545 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | bip->bli_flags |= XFS_BLI_HOLD; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 549 | trace_xfs_trans_bhold(bip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | /* |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 553 | * Cancel the previous buffer hold request made on this buffer |
| 554 | * for this transaction. |
| 555 | */ |
| 556 | void |
| 557 | xfs_trans_bhold_release(xfs_trans_t *tp, |
| 558 | xfs_buf_t *bp) |
| 559 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 560 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 561 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 562 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 563 | ASSERT(bip != NULL); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 564 | ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 565 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL)); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 566 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 567 | ASSERT(bip->bli_flags & XFS_BLI_HOLD); |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 568 | |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 569 | bip->bli_flags &= ~XFS_BLI_HOLD; |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 570 | trace_xfs_trans_bhold_release(bip); |
Tim Shimmin | efa092f | 2005-09-05 08:29:01 +1000 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | * This is called to mark bytes first through last inclusive of the given |
| 575 | * buffer as needing to be logged when the transaction is committed. |
| 576 | * The buffer must already be associated with the given transaction. |
| 577 | * |
| 578 | * First and last are numbers relative to the beginning of this buffer, |
| 579 | * so the first byte in the buffer is numbered 0 regardless of the |
| 580 | * value of b_blkno. |
| 581 | */ |
| 582 | void |
| 583 | xfs_trans_log_buf(xfs_trans_t *tp, |
| 584 | xfs_buf_t *bp, |
| 585 | uint first, |
| 586 | uint last) |
| 587 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 588 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 590 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 591 | ASSERT(bip != NULL); |
Dave Chinner | aa0e883 | 2012-04-23 15:58:52 +1000 | [diff] [blame] | 592 | ASSERT(first <= last && last < BBTOB(bp->b_length)); |
Christoph Hellwig | cb669ca | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 593 | ASSERT(bp->b_iodone == NULL || |
| 594 | bp->b_iodone == xfs_buf_iodone_callbacks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
| 596 | /* |
| 597 | * Mark the buffer as needing to be written out eventually, |
| 598 | * and set its iodone function to remove the buffer's buf log |
| 599 | * item from the AIL and free it when the buffer is flushed |
| 600 | * to disk. See xfs_buf_attach_iodone() for more details |
| 601 | * on li_cb and xfs_buf_iodone_callbacks(). |
| 602 | * If we end up aborting this transaction, we trap this buffer |
| 603 | * inside the b_bdstrat callback so that this won't get written to |
| 604 | * disk. |
| 605 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | XFS_BUF_DONE(bp); |
| 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
Christoph Hellwig | cb669ca | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 609 | bp->b_iodone = xfs_buf_iodone_callbacks; |
Christoph Hellwig | ca30b2a | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 610 | bip->bli_item.li_cb = xfs_buf_iodone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 612 | trace_xfs_trans_log_buf(bip); |
| 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* |
| 615 | * If we invalidated the buffer within this transaction, then |
| 616 | * cancel the invalidation now that we're dirtying the buffer |
| 617 | * again. There are no races with the code in xfs_buf_item_unpin(), |
| 618 | * because we have a reference to the buffer this entire time. |
| 619 | */ |
| 620 | if (bip->bli_flags & XFS_BLI_STALE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | bip->bli_flags &= ~XFS_BLI_STALE; |
| 622 | ASSERT(XFS_BUF_ISSTALE(bp)); |
| 623 | XFS_BUF_UNSTALE(bp); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 624 | bip->bli_format.blf_flags &= ~XFS_BLF_CANCEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | tp->t_flags |= XFS_TRANS_DIRTY; |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 628 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | bip->bli_flags |= XFS_BLI_LOGGED; |
| 630 | xfs_buf_item_log(bip, first, last); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
| 633 | |
| 634 | /* |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 635 | * Invalidate a buffer that is being used within a transaction. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | * |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 637 | * Typically this is because the blocks in the buffer are being freed, so we |
| 638 | * need to prevent it from being written out when we're done. Allowing it |
| 639 | * to be written again might overwrite data in the free blocks if they are |
| 640 | * reallocated to a file. |
| 641 | * |
| 642 | * We prevent the buffer from being written out by marking it stale. We can't |
| 643 | * get rid of the buf log item at this point because the buffer may still be |
| 644 | * pinned by another transaction. If that is the case, then we'll wait until |
| 645 | * the buffer is committed to disk for the last time (we can tell by the ref |
| 646 | * count) and free it in xfs_buf_item_unpin(). Until that happens we will |
| 647 | * keep the buffer locked so that the buffer and buf log item are not reused. |
| 648 | * |
| 649 | * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log |
| 650 | * the buf item. This will be used at recovery time to determine that copies |
| 651 | * of the buffer in the log before this should not be replayed. |
| 652 | * |
| 653 | * We mark the item descriptor and the transaction dirty so that we'll hold |
| 654 | * the buffer until after the commit. |
| 655 | * |
| 656 | * Since we're invalidating the buffer, we also clear the state about which |
| 657 | * parts of the buffer have been logged. We also clear the flag indicating |
| 658 | * that this is an inode buffer since the data in the buffer will no longer |
| 659 | * be valid. |
| 660 | * |
| 661 | * We set the stale bit in the buffer as well since we're getting rid of it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | */ |
| 663 | void |
| 664 | xfs_trans_binval( |
| 665 | xfs_trans_t *tp, |
| 666 | xfs_buf_t *bp) |
| 667 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 668 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 670 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 671 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 673 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 674 | trace_xfs_trans_binval(bip); |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (bip->bli_flags & XFS_BLI_STALE) { |
| 677 | /* |
| 678 | * If the buffer is already invalidated, then |
| 679 | * just return. |
| 680 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | ASSERT(XFS_BUF_ISSTALE(bp)); |
| 682 | ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY))); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 683 | ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF)); |
| 684 | ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL); |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 685 | ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | ASSERT(tp->t_flags & XFS_TRANS_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | return; |
| 688 | } |
| 689 | |
Christoph Hellwig | c867cb6 | 2011-10-10 16:52:46 +0000 | [diff] [blame] | 690 | xfs_buf_stale(bp); |
Christoph Hellwig | 43ff212 | 2012-04-23 15:58:39 +1000 | [diff] [blame] | 691 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | bip->bli_flags |= XFS_BLI_STALE; |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 693 | 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] | 694 | bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF; |
| 695 | bip->bli_format.blf_flags |= XFS_BLF_CANCEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | memset((char *)(bip->bli_format.blf_data_map), 0, |
| 697 | (bip->bli_format.blf_map_size * sizeof(uint))); |
Christoph Hellwig | e98c414 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 698 | bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | tp->t_flags |= XFS_TRANS_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | /* |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 703 | * This call is used to indicate that the buffer contains on-disk inodes which |
| 704 | * must be handled specially during recovery. They require special handling |
| 705 | * because only the di_next_unlinked from the inodes in the buffer should be |
| 706 | * recovered. The rest of the data in the buffer is logged via the inodes |
| 707 | * themselves. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | * |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 709 | * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be |
| 710 | * transferred to the buffer's log format structure so that we'll know what to |
| 711 | * do at recovery time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | void |
| 714 | xfs_trans_inode_buf( |
| 715 | xfs_trans_t *tp, |
| 716 | xfs_buf_t *bp) |
| 717 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 718 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 720 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 721 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 723 | |
Dave Chinner | ccf7c23 | 2010-05-20 23:19:42 +1000 | [diff] [blame] | 724 | bip->bli_flags |= XFS_BLI_INODE_BUF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | /* |
| 728 | * This call is used to indicate that the buffer is going to |
| 729 | * be staled and was an inode buffer. This means it gets |
| 730 | * special processing during unpin - where any inodes |
| 731 | * associated with the buffer should be removed from ail. |
| 732 | * There is also special processing during recovery, |
| 733 | * any replay of the inodes in the buffer needs to be |
| 734 | * prevented as the buffer may have been reused. |
| 735 | */ |
| 736 | void |
| 737 | xfs_trans_stale_inode_buf( |
| 738 | xfs_trans_t *tp, |
| 739 | xfs_buf_t *bp) |
| 740 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 741 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 743 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 744 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 746 | |
| 747 | bip->bli_flags |= XFS_BLI_STALE_INODE; |
Christoph Hellwig | ca30b2a | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 748 | bip->bli_item.li_cb = xfs_buf_iodone; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | /* |
| 752 | * Mark the buffer as being one which contains newly allocated |
| 753 | * inodes. We need to make sure that even if this buffer is |
| 754 | * relogged as an 'inode buf' we still recover all of the inode |
| 755 | * images in the face of a crash. This works in coordination with |
| 756 | * xfs_buf_item_committed() to ensure that the buffer remains in the |
| 757 | * AIL at its original location even after it has been relogged. |
| 758 | */ |
| 759 | /* ARGSUSED */ |
| 760 | void |
| 761 | xfs_trans_inode_alloc_buf( |
| 762 | xfs_trans_t *tp, |
| 763 | xfs_buf_t *bp) |
| 764 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 765 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 767 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 768 | ASSERT(bip != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 770 | |
| 771 | bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF; |
| 772 | } |
| 773 | |
| 774 | |
| 775 | /* |
| 776 | * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of |
| 777 | * dquots. However, unlike in inode buffer recovery, dquot buffers get |
| 778 | * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag). |
| 779 | * The only thing that makes dquot buffers different from regular |
| 780 | * buffers is that we must not replay dquot bufs when recovering |
| 781 | * if a _corresponding_ quotaoff has happened. We also have to distinguish |
| 782 | * between usr dquot bufs and grp dquot bufs, because usr and grp quotas |
| 783 | * can be turned off independently. |
| 784 | */ |
| 785 | /* ARGSUSED */ |
| 786 | void |
| 787 | xfs_trans_dquot_buf( |
| 788 | xfs_trans_t *tp, |
| 789 | xfs_buf_t *bp, |
| 790 | uint type) |
| 791 | { |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 792 | xfs_buf_log_item_t *bip = bp->b_fspriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 794 | ASSERT(bp->b_transp == tp); |
Christoph Hellwig | adadbee | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 795 | ASSERT(bip != NULL); |
Dave Chinner | c115541 | 2010-05-07 11:05:19 +1000 | [diff] [blame] | 796 | ASSERT(type == XFS_BLF_UDQUOT_BUF || |
| 797 | type == XFS_BLF_PDQUOT_BUF || |
| 798 | type == XFS_BLF_GDQUOT_BUF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | ASSERT(atomic_read(&bip->bli_refcount) > 0); |
| 800 | |
| 801 | bip->bli_format.blf_flags |= type; |
| 802 | } |