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) 2000-2005 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" |
| 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_da_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_bmap_btree.h" |
Christoph Hellwig | 5792664 | 2011-07-13 13:43:48 +0200 | [diff] [blame] | 30 | #include "xfs_dir2.h" |
| 31 | #include "xfs_dir2_format.h" |
| 32 | #include "xfs_dir2_priv.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include "xfs_dinode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_inode.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 35 | #include "xfs_inode_item.h" |
| 36 | #include "xfs_alloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "xfs_bmap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include "xfs_attr.h" |
| 39 | #include "xfs_attr_leaf.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "xfs_error.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 41 | #include "xfs_trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | /* |
| 44 | * xfs_da_btree.c |
| 45 | * |
| 46 | * Routines to implement directories as Btrees of hashed names. |
| 47 | */ |
| 48 | |
| 49 | /*======================================================================== |
| 50 | * Function prototypes for the kernel. |
| 51 | *========================================================================*/ |
| 52 | |
| 53 | /* |
| 54 | * Routines used for growing the Btree. |
| 55 | */ |
| 56 | STATIC int xfs_da_root_split(xfs_da_state_t *state, |
| 57 | xfs_da_state_blk_t *existing_root, |
| 58 | xfs_da_state_blk_t *new_child); |
| 59 | STATIC int xfs_da_node_split(xfs_da_state_t *state, |
| 60 | xfs_da_state_blk_t *existing_blk, |
| 61 | xfs_da_state_blk_t *split_blk, |
| 62 | xfs_da_state_blk_t *blk_to_add, |
| 63 | int treelevel, |
| 64 | int *result); |
| 65 | STATIC void xfs_da_node_rebalance(xfs_da_state_t *state, |
| 66 | xfs_da_state_blk_t *node_blk_1, |
| 67 | xfs_da_state_blk_t *node_blk_2); |
| 68 | STATIC void xfs_da_node_add(xfs_da_state_t *state, |
| 69 | xfs_da_state_blk_t *old_node_blk, |
| 70 | xfs_da_state_blk_t *new_node_blk); |
| 71 | |
| 72 | /* |
| 73 | * Routines used for shrinking the Btree. |
| 74 | */ |
| 75 | STATIC int xfs_da_root_join(xfs_da_state_t *state, |
| 76 | xfs_da_state_blk_t *root_blk); |
| 77 | STATIC int xfs_da_node_toosmall(xfs_da_state_t *state, int *retval); |
| 78 | STATIC void xfs_da_node_remove(xfs_da_state_t *state, |
| 79 | xfs_da_state_blk_t *drop_blk); |
| 80 | STATIC void xfs_da_node_unbalance(xfs_da_state_t *state, |
| 81 | xfs_da_state_blk_t *src_node_blk, |
| 82 | xfs_da_state_blk_t *dst_node_blk); |
| 83 | |
| 84 | /* |
| 85 | * Utility routines. |
| 86 | */ |
| 87 | STATIC uint xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count); |
| 88 | STATIC int xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp); |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 89 | STATIC xfs_dabuf_t *xfs_da_buf_make(int nbuf, xfs_buf_t **bps); |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 90 | STATIC int xfs_da_blk_unlink(xfs_da_state_t *state, |
| 91 | xfs_da_state_blk_t *drop_blk, |
| 92 | xfs_da_state_blk_t *save_blk); |
| 93 | STATIC void xfs_da_state_kill_altpath(xfs_da_state_t *state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | /*======================================================================== |
| 96 | * Routines used for growing the Btree. |
| 97 | *========================================================================*/ |
| 98 | |
| 99 | /* |
| 100 | * Create the initial contents of an intermediate node. |
| 101 | */ |
| 102 | int |
| 103 | xfs_da_node_create(xfs_da_args_t *args, xfs_dablk_t blkno, int level, |
| 104 | xfs_dabuf_t **bpp, int whichfork) |
| 105 | { |
| 106 | xfs_da_intnode_t *node; |
| 107 | xfs_dabuf_t *bp; |
| 108 | int error; |
| 109 | xfs_trans_t *tp; |
| 110 | |
| 111 | tp = args->trans; |
| 112 | error = xfs_da_get_buf(tp, args->dp, blkno, -1, &bp, whichfork); |
| 113 | if (error) |
| 114 | return(error); |
| 115 | ASSERT(bp != NULL); |
| 116 | node = bp->data; |
| 117 | node->hdr.info.forw = 0; |
| 118 | node->hdr.info.back = 0; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 119 | node->hdr.info.magic = cpu_to_be16(XFS_DA_NODE_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | node->hdr.info.pad = 0; |
| 121 | node->hdr.count = 0; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 122 | node->hdr.level = cpu_to_be16(level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | xfs_da_log_buf(tp, bp, |
| 125 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); |
| 126 | |
| 127 | *bpp = bp; |
| 128 | return(0); |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * Split a leaf node, rebalance, then possibly split |
| 133 | * intermediate nodes, rebalance, etc. |
| 134 | */ |
| 135 | int /* error */ |
| 136 | xfs_da_split(xfs_da_state_t *state) |
| 137 | { |
| 138 | xfs_da_state_blk_t *oldblk, *newblk, *addblk; |
| 139 | xfs_da_intnode_t *node; |
| 140 | xfs_dabuf_t *bp; |
| 141 | int max, action, error, i; |
| 142 | |
| 143 | /* |
| 144 | * Walk back up the tree splitting/inserting/adjusting as necessary. |
| 145 | * If we need to insert and there isn't room, split the node, then |
| 146 | * decide which fragment to insert the new block from below into. |
| 147 | * Note that we may split the root this way, but we need more fixup. |
| 148 | */ |
| 149 | max = state->path.active - 1; |
| 150 | ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH)); |
| 151 | ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC || |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 152 | state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | addblk = &state->path.blk[max]; /* initial dummy value */ |
| 155 | for (i = max; (i >= 0) && addblk; state->path.active--, i--) { |
| 156 | oldblk = &state->path.blk[i]; |
| 157 | newblk = &state->altpath.blk[i]; |
| 158 | |
| 159 | /* |
| 160 | * If a leaf node then |
| 161 | * Allocate a new leaf node, then rebalance across them. |
| 162 | * else if an intermediate node then |
| 163 | * We split on the last layer, must we split the node? |
| 164 | */ |
| 165 | switch (oldblk->magic) { |
| 166 | case XFS_ATTR_LEAF_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | error = xfs_attr_leaf_split(state, oldblk, newblk); |
| 168 | if ((error != 0) && (error != ENOSPC)) { |
| 169 | return(error); /* GROT: attr is inconsistent */ |
| 170 | } |
| 171 | if (!error) { |
| 172 | addblk = newblk; |
| 173 | break; |
| 174 | } |
| 175 | /* |
| 176 | * Entry wouldn't fit, split the leaf again. |
| 177 | */ |
| 178 | state->extravalid = 1; |
| 179 | if (state->inleaf) { |
| 180 | state->extraafter = 0; /* before newblk */ |
| 181 | error = xfs_attr_leaf_split(state, oldblk, |
| 182 | &state->extrablk); |
| 183 | } else { |
| 184 | state->extraafter = 1; /* after newblk */ |
| 185 | error = xfs_attr_leaf_split(state, newblk, |
| 186 | &state->extrablk); |
| 187 | } |
| 188 | if (error) |
| 189 | return(error); /* GROT: attr inconsistent */ |
| 190 | addblk = newblk; |
| 191 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | case XFS_DIR2_LEAFN_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | error = xfs_dir2_leafn_split(state, oldblk, newblk); |
| 194 | if (error) |
| 195 | return error; |
| 196 | addblk = newblk; |
| 197 | break; |
| 198 | case XFS_DA_NODE_MAGIC: |
| 199 | error = xfs_da_node_split(state, oldblk, newblk, addblk, |
| 200 | max - i, &action); |
| 201 | xfs_da_buf_done(addblk->bp); |
| 202 | addblk->bp = NULL; |
| 203 | if (error) |
| 204 | return(error); /* GROT: dir is inconsistent */ |
| 205 | /* |
| 206 | * Record the newly split block for the next time thru? |
| 207 | */ |
| 208 | if (action) |
| 209 | addblk = newblk; |
| 210 | else |
| 211 | addblk = NULL; |
| 212 | break; |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Update the btree to show the new hashval for this child. |
| 217 | */ |
| 218 | xfs_da_fixhashpath(state, &state->path); |
| 219 | /* |
| 220 | * If we won't need this block again, it's getting dropped |
| 221 | * from the active path by the loop control, so we need |
| 222 | * to mark it done now. |
| 223 | */ |
| 224 | if (i > 0 || !addblk) |
| 225 | xfs_da_buf_done(oldblk->bp); |
| 226 | } |
| 227 | if (!addblk) |
| 228 | return(0); |
| 229 | |
| 230 | /* |
| 231 | * Split the root node. |
| 232 | */ |
| 233 | ASSERT(state->path.active == 0); |
| 234 | oldblk = &state->path.blk[0]; |
| 235 | error = xfs_da_root_split(state, oldblk, addblk); |
| 236 | if (error) { |
| 237 | xfs_da_buf_done(oldblk->bp); |
| 238 | xfs_da_buf_done(addblk->bp); |
| 239 | addblk->bp = NULL; |
| 240 | return(error); /* GROT: dir is inconsistent */ |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Update pointers to the node which used to be block 0 and |
| 245 | * just got bumped because of the addition of a new root node. |
| 246 | * There might be three blocks involved if a double split occurred, |
| 247 | * and the original block 0 could be at any position in the list. |
| 248 | */ |
| 249 | |
| 250 | node = oldblk->bp->data; |
| 251 | if (node->hdr.info.forw) { |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 252 | if (be32_to_cpu(node->hdr.info.forw) == addblk->blkno) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | bp = addblk->bp; |
| 254 | } else { |
| 255 | ASSERT(state->extravalid); |
| 256 | bp = state->extrablk.bp; |
| 257 | } |
| 258 | node = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 259 | node->hdr.info.back = cpu_to_be32(oldblk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | xfs_da_log_buf(state->args->trans, bp, |
| 261 | XFS_DA_LOGRANGE(node, &node->hdr.info, |
| 262 | sizeof(node->hdr.info))); |
| 263 | } |
| 264 | node = oldblk->bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 265 | if (node->hdr.info.back) { |
| 266 | if (be32_to_cpu(node->hdr.info.back) == addblk->blkno) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | bp = addblk->bp; |
| 268 | } else { |
| 269 | ASSERT(state->extravalid); |
| 270 | bp = state->extrablk.bp; |
| 271 | } |
| 272 | node = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 273 | node->hdr.info.forw = cpu_to_be32(oldblk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | xfs_da_log_buf(state->args->trans, bp, |
| 275 | XFS_DA_LOGRANGE(node, &node->hdr.info, |
| 276 | sizeof(node->hdr.info))); |
| 277 | } |
| 278 | xfs_da_buf_done(oldblk->bp); |
| 279 | xfs_da_buf_done(addblk->bp); |
| 280 | addblk->bp = NULL; |
| 281 | return(0); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Split the root. We have to create a new root and point to the two |
| 286 | * parts (the split old root) that we just created. Copy block zero to |
| 287 | * the EOF, extending the inode in process. |
| 288 | */ |
| 289 | STATIC int /* error */ |
| 290 | xfs_da_root_split(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, |
| 291 | xfs_da_state_blk_t *blk2) |
| 292 | { |
| 293 | xfs_da_intnode_t *node, *oldroot; |
| 294 | xfs_da_args_t *args; |
| 295 | xfs_dablk_t blkno; |
| 296 | xfs_dabuf_t *bp; |
| 297 | int error, size; |
| 298 | xfs_inode_t *dp; |
| 299 | xfs_trans_t *tp; |
| 300 | xfs_mount_t *mp; |
| 301 | xfs_dir2_leaf_t *leaf; |
| 302 | |
| 303 | /* |
| 304 | * Copy the existing (incorrect) block from the root node position |
| 305 | * to a free space somewhere. |
| 306 | */ |
| 307 | args = state->args; |
| 308 | ASSERT(args != NULL); |
| 309 | error = xfs_da_grow_inode(args, &blkno); |
| 310 | if (error) |
| 311 | return(error); |
| 312 | dp = args->dp; |
| 313 | tp = args->trans; |
| 314 | mp = state->mp; |
| 315 | error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, args->whichfork); |
| 316 | if (error) |
| 317 | return(error); |
| 318 | ASSERT(bp != NULL); |
| 319 | node = bp->data; |
| 320 | oldroot = blk1->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 321 | if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)) { |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 322 | size = (int)((char *)&oldroot->btree[be16_to_cpu(oldroot->hdr.count)] - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | (char *)oldroot); |
| 324 | } else { |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 325 | ASSERT(oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | leaf = (xfs_dir2_leaf_t *)oldroot; |
Nathan Scott | a818e5d | 2006-03-17 17:28:07 +1100 | [diff] [blame] | 327 | size = (int)((char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | (char *)leaf); |
| 329 | } |
| 330 | memcpy(node, oldroot, size); |
| 331 | xfs_da_log_buf(tp, bp, 0, size - 1); |
| 332 | xfs_da_buf_done(blk1->bp); |
| 333 | blk1->bp = bp; |
| 334 | blk1->blkno = blkno; |
| 335 | |
| 336 | /* |
| 337 | * Set up the new root node. |
| 338 | */ |
| 339 | error = xfs_da_node_create(args, |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 340 | (args->whichfork == XFS_DATA_FORK) ? mp->m_dirleafblk : 0, |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 341 | be16_to_cpu(node->hdr.level) + 1, &bp, args->whichfork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (error) |
| 343 | return(error); |
| 344 | node = bp->data; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 345 | node->btree[0].hashval = cpu_to_be32(blk1->hashval); |
| 346 | node->btree[0].before = cpu_to_be32(blk1->blkno); |
| 347 | node->btree[1].hashval = cpu_to_be32(blk2->hashval); |
| 348 | node->btree[1].before = cpu_to_be32(blk2->blkno); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 349 | node->hdr.count = cpu_to_be16(2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | #ifdef DEBUG |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 352 | if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | ASSERT(blk1->blkno >= mp->m_dirleafblk && |
| 354 | blk1->blkno < mp->m_dirfreeblk); |
| 355 | ASSERT(blk2->blkno >= mp->m_dirleafblk && |
| 356 | blk2->blkno < mp->m_dirfreeblk); |
| 357 | } |
| 358 | #endif |
| 359 | |
| 360 | /* Header is already logged by xfs_da_node_create */ |
| 361 | xfs_da_log_buf(tp, bp, |
| 362 | XFS_DA_LOGRANGE(node, node->btree, |
| 363 | sizeof(xfs_da_node_entry_t) * 2)); |
| 364 | xfs_da_buf_done(bp); |
| 365 | |
| 366 | return(0); |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Split the node, rebalance, then add the new entry. |
| 371 | */ |
| 372 | STATIC int /* error */ |
| 373 | xfs_da_node_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, |
| 374 | xfs_da_state_blk_t *newblk, |
| 375 | xfs_da_state_blk_t *addblk, |
| 376 | int treelevel, int *result) |
| 377 | { |
| 378 | xfs_da_intnode_t *node; |
| 379 | xfs_dablk_t blkno; |
| 380 | int newcount, error; |
| 381 | int useextra; |
| 382 | |
| 383 | node = oldblk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 384 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | /* |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 387 | * With V2 dirs the extra block is data or freespace. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | */ |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 389 | useextra = state->extravalid && state->args->whichfork == XFS_ATTR_FORK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | newcount = 1 + useextra; |
| 391 | /* |
| 392 | * Do we have to split the node? |
| 393 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 394 | if ((be16_to_cpu(node->hdr.count) + newcount) > state->node_ents) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | /* |
| 396 | * Allocate a new node, add to the doubly linked chain of |
| 397 | * nodes, then move some of our excess entries into it. |
| 398 | */ |
| 399 | error = xfs_da_grow_inode(state->args, &blkno); |
| 400 | if (error) |
| 401 | return(error); /* GROT: dir is inconsistent */ |
| 402 | |
| 403 | error = xfs_da_node_create(state->args, blkno, treelevel, |
| 404 | &newblk->bp, state->args->whichfork); |
| 405 | if (error) |
| 406 | return(error); /* GROT: dir is inconsistent */ |
| 407 | newblk->blkno = blkno; |
| 408 | newblk->magic = XFS_DA_NODE_MAGIC; |
| 409 | xfs_da_node_rebalance(state, oldblk, newblk); |
| 410 | error = xfs_da_blk_link(state, oldblk, newblk); |
| 411 | if (error) |
| 412 | return(error); |
| 413 | *result = 1; |
| 414 | } else { |
| 415 | *result = 0; |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Insert the new entry(s) into the correct block |
| 420 | * (updating last hashval in the process). |
| 421 | * |
| 422 | * xfs_da_node_add() inserts BEFORE the given index, |
| 423 | * and as a result of using node_lookup_int() we always |
| 424 | * point to a valid entry (not after one), but a split |
| 425 | * operation always results in a new block whose hashvals |
| 426 | * FOLLOW the current block. |
| 427 | * |
| 428 | * If we had double-split op below us, then add the extra block too. |
| 429 | */ |
| 430 | node = oldblk->bp->data; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 431 | if (oldblk->index <= be16_to_cpu(node->hdr.count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | oldblk->index++; |
| 433 | xfs_da_node_add(state, oldblk, addblk); |
| 434 | if (useextra) { |
| 435 | if (state->extraafter) |
| 436 | oldblk->index++; |
| 437 | xfs_da_node_add(state, oldblk, &state->extrablk); |
| 438 | state->extravalid = 0; |
| 439 | } |
| 440 | } else { |
| 441 | newblk->index++; |
| 442 | xfs_da_node_add(state, newblk, addblk); |
| 443 | if (useextra) { |
| 444 | if (state->extraafter) |
| 445 | newblk->index++; |
| 446 | xfs_da_node_add(state, newblk, &state->extrablk); |
| 447 | state->extravalid = 0; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | return(0); |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Balance the btree elements between two intermediate nodes, |
| 456 | * usually one full and one empty. |
| 457 | * |
| 458 | * NOTE: if blk2 is empty, then it will get the upper half of blk1. |
| 459 | */ |
| 460 | STATIC void |
| 461 | xfs_da_node_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1, |
| 462 | xfs_da_state_blk_t *blk2) |
| 463 | { |
| 464 | xfs_da_intnode_t *node1, *node2, *tmpnode; |
| 465 | xfs_da_node_entry_t *btree_s, *btree_d; |
| 466 | int count, tmp; |
| 467 | xfs_trans_t *tp; |
| 468 | |
| 469 | node1 = blk1->bp->data; |
| 470 | node2 = blk2->bp->data; |
| 471 | /* |
| 472 | * Figure out how many entries need to move, and in which direction. |
| 473 | * Swap the nodes around if that makes it simpler. |
| 474 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 475 | if ((be16_to_cpu(node1->hdr.count) > 0) && (be16_to_cpu(node2->hdr.count) > 0) && |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 476 | ((be32_to_cpu(node2->btree[0].hashval) < be32_to_cpu(node1->btree[0].hashval)) || |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 477 | (be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval) < |
| 478 | be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | tmpnode = node1; |
| 480 | node1 = node2; |
| 481 | node2 = tmpnode; |
| 482 | } |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 483 | ASSERT(node1->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
| 484 | ASSERT(node2->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 485 | count = (be16_to_cpu(node1->hdr.count) - be16_to_cpu(node2->hdr.count)) / 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | if (count == 0) |
| 487 | return; |
| 488 | tp = state->args->trans; |
| 489 | /* |
| 490 | * Two cases: high-to-low and low-to-high. |
| 491 | */ |
| 492 | if (count > 0) { |
| 493 | /* |
| 494 | * Move elements in node2 up to make a hole. |
| 495 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 496 | if ((tmp = be16_to_cpu(node2->hdr.count)) > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | tmp *= (uint)sizeof(xfs_da_node_entry_t); |
| 498 | btree_s = &node2->btree[0]; |
| 499 | btree_d = &node2->btree[count]; |
| 500 | memmove(btree_d, btree_s, tmp); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Move the req'd B-tree elements from high in node1 to |
| 505 | * low in node2. |
| 506 | */ |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 507 | be16_add_cpu(&node2->hdr.count, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | tmp = count * (uint)sizeof(xfs_da_node_entry_t); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 509 | btree_s = &node1->btree[be16_to_cpu(node1->hdr.count) - count]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | btree_d = &node2->btree[0]; |
| 511 | memcpy(btree_d, btree_s, tmp); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 512 | be16_add_cpu(&node1->hdr.count, -count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } else { |
| 514 | /* |
| 515 | * Move the req'd B-tree elements from low in node2 to |
| 516 | * high in node1. |
| 517 | */ |
| 518 | count = -count; |
| 519 | tmp = count * (uint)sizeof(xfs_da_node_entry_t); |
| 520 | btree_s = &node2->btree[0]; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 521 | btree_d = &node1->btree[be16_to_cpu(node1->hdr.count)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | memcpy(btree_d, btree_s, tmp); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 523 | be16_add_cpu(&node1->hdr.count, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | xfs_da_log_buf(tp, blk1->bp, |
| 525 | XFS_DA_LOGRANGE(node1, btree_d, tmp)); |
| 526 | |
| 527 | /* |
| 528 | * Move elements in node2 down to fill the hole. |
| 529 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 530 | tmp = be16_to_cpu(node2->hdr.count) - count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | tmp *= (uint)sizeof(xfs_da_node_entry_t); |
| 532 | btree_s = &node2->btree[count]; |
| 533 | btree_d = &node2->btree[0]; |
| 534 | memmove(btree_d, btree_s, tmp); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 535 | be16_add_cpu(&node2->hdr.count, -count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Log header of node 1 and all current bits of node 2. |
| 540 | */ |
| 541 | xfs_da_log_buf(tp, blk1->bp, |
| 542 | XFS_DA_LOGRANGE(node1, &node1->hdr, sizeof(node1->hdr))); |
| 543 | xfs_da_log_buf(tp, blk2->bp, |
| 544 | XFS_DA_LOGRANGE(node2, &node2->hdr, |
| 545 | sizeof(node2->hdr) + |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 546 | sizeof(node2->btree[0]) * be16_to_cpu(node2->hdr.count))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | /* |
| 549 | * Record the last hashval from each block for upward propagation. |
| 550 | * (note: don't use the swapped node pointers) |
| 551 | */ |
| 552 | node1 = blk1->bp->data; |
| 553 | node2 = blk2->bp->data; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 554 | blk1->hashval = be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval); |
| 555 | blk2->hashval = be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | /* |
| 558 | * Adjust the expected index for insertion. |
| 559 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 560 | if (blk1->index >= be16_to_cpu(node1->hdr.count)) { |
| 561 | blk2->index = blk1->index - be16_to_cpu(node1->hdr.count); |
| 562 | blk1->index = be16_to_cpu(node1->hdr.count) + 1; /* make it invalid */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Add a new entry to an intermediate node. |
| 568 | */ |
| 569 | STATIC void |
| 570 | xfs_da_node_add(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk, |
| 571 | xfs_da_state_blk_t *newblk) |
| 572 | { |
| 573 | xfs_da_intnode_t *node; |
| 574 | xfs_da_node_entry_t *btree; |
| 575 | int tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | node = oldblk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 578 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 579 | ASSERT((oldblk->index >= 0) && (oldblk->index <= be16_to_cpu(node->hdr.count))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | ASSERT(newblk->blkno != 0); |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 581 | if (state->args->whichfork == XFS_DATA_FORK) |
Christoph Hellwig | 73523a2 | 2010-07-20 17:54:45 +1000 | [diff] [blame] | 582 | ASSERT(newblk->blkno >= state->mp->m_dirleafblk && |
| 583 | newblk->blkno < state->mp->m_dirfreeblk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | /* |
| 586 | * We may need to make some room before we insert the new node. |
| 587 | */ |
| 588 | tmp = 0; |
| 589 | btree = &node->btree[ oldblk->index ]; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 590 | if (oldblk->index < be16_to_cpu(node->hdr.count)) { |
| 591 | tmp = (be16_to_cpu(node->hdr.count) - oldblk->index) * (uint)sizeof(*btree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | memmove(btree + 1, btree, tmp); |
| 593 | } |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 594 | btree->hashval = cpu_to_be32(newblk->hashval); |
| 595 | btree->before = cpu_to_be32(newblk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | xfs_da_log_buf(state->args->trans, oldblk->bp, |
| 597 | XFS_DA_LOGRANGE(node, btree, tmp + sizeof(*btree))); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 598 | be16_add_cpu(&node->hdr.count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | xfs_da_log_buf(state->args->trans, oldblk->bp, |
| 600 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); |
| 601 | |
| 602 | /* |
| 603 | * Copy the last hash value from the oldblk to propagate upwards. |
| 604 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 605 | oldblk->hashval = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1 ].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
| 608 | /*======================================================================== |
| 609 | * Routines used for shrinking the Btree. |
| 610 | *========================================================================*/ |
| 611 | |
| 612 | /* |
| 613 | * Deallocate an empty leaf node, remove it from its parent, |
| 614 | * possibly deallocating that block, etc... |
| 615 | */ |
| 616 | int |
| 617 | xfs_da_join(xfs_da_state_t *state) |
| 618 | { |
| 619 | xfs_da_state_blk_t *drop_blk, *save_blk; |
| 620 | int action, error; |
| 621 | |
| 622 | action = 0; |
| 623 | drop_blk = &state->path.blk[ state->path.active-1 ]; |
| 624 | save_blk = &state->altpath.blk[ state->path.active-1 ]; |
| 625 | ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC); |
| 626 | ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC || |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 627 | drop_blk->magic == XFS_DIR2_LEAFN_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
| 629 | /* |
| 630 | * Walk back up the tree joining/deallocating as necessary. |
| 631 | * When we stop dropping blocks, break out. |
| 632 | */ |
| 633 | for ( ; state->path.active >= 2; drop_blk--, save_blk--, |
| 634 | state->path.active--) { |
| 635 | /* |
| 636 | * See if we can combine the block with a neighbor. |
| 637 | * (action == 0) => no options, just leave |
| 638 | * (action == 1) => coalesce, then unlink |
| 639 | * (action == 2) => block empty, unlink it |
| 640 | */ |
| 641 | switch (drop_blk->magic) { |
| 642 | case XFS_ATTR_LEAF_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | error = xfs_attr_leaf_toosmall(state, &action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | if (error) |
| 645 | return(error); |
| 646 | if (action == 0) |
| 647 | return(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | xfs_attr_leaf_unbalance(state, drop_blk, save_blk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | case XFS_DIR2_LEAFN_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | error = xfs_dir2_leafn_toosmall(state, &action); |
| 652 | if (error) |
| 653 | return error; |
| 654 | if (action == 0) |
| 655 | return 0; |
| 656 | xfs_dir2_leafn_unbalance(state, drop_blk, save_blk); |
| 657 | break; |
| 658 | case XFS_DA_NODE_MAGIC: |
| 659 | /* |
| 660 | * Remove the offending node, fixup hashvals, |
| 661 | * check for a toosmall neighbor. |
| 662 | */ |
| 663 | xfs_da_node_remove(state, drop_blk); |
| 664 | xfs_da_fixhashpath(state, &state->path); |
| 665 | error = xfs_da_node_toosmall(state, &action); |
| 666 | if (error) |
| 667 | return(error); |
| 668 | if (action == 0) |
| 669 | return 0; |
| 670 | xfs_da_node_unbalance(state, drop_blk, save_blk); |
| 671 | break; |
| 672 | } |
| 673 | xfs_da_fixhashpath(state, &state->altpath); |
| 674 | error = xfs_da_blk_unlink(state, drop_blk, save_blk); |
| 675 | xfs_da_state_kill_altpath(state); |
| 676 | if (error) |
| 677 | return(error); |
| 678 | error = xfs_da_shrink_inode(state->args, drop_blk->blkno, |
| 679 | drop_blk->bp); |
| 680 | drop_blk->bp = NULL; |
| 681 | if (error) |
| 682 | return(error); |
| 683 | } |
| 684 | /* |
| 685 | * We joined all the way to the top. If it turns out that |
| 686 | * we only have one entry in the root, make the child block |
| 687 | * the new root. |
| 688 | */ |
| 689 | xfs_da_node_remove(state, drop_blk); |
| 690 | xfs_da_fixhashpath(state, &state->path); |
| 691 | error = xfs_da_root_join(state, &state->path.blk[0]); |
| 692 | return(error); |
| 693 | } |
| 694 | |
Alex Elder | 1c4f332 | 2011-07-18 18:14:09 +0000 | [diff] [blame] | 695 | #ifdef DEBUG |
| 696 | static void |
| 697 | xfs_da_blkinfo_onlychild_validate(struct xfs_da_blkinfo *blkinfo, __u16 level) |
| 698 | { |
| 699 | __be16 magic = blkinfo->magic; |
| 700 | |
| 701 | if (level == 1) { |
| 702 | ASSERT(magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) || |
| 703 | magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC)); |
| 704 | } else |
| 705 | ASSERT(magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
| 706 | ASSERT(!blkinfo->forw); |
| 707 | ASSERT(!blkinfo->back); |
| 708 | } |
| 709 | #else /* !DEBUG */ |
| 710 | #define xfs_da_blkinfo_onlychild_validate(blkinfo, level) |
| 711 | #endif /* !DEBUG */ |
| 712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | /* |
| 714 | * We have only one entry in the root. Copy the only remaining child of |
| 715 | * the old root to block 0 as the new root node. |
| 716 | */ |
| 717 | STATIC int |
| 718 | xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk) |
| 719 | { |
| 720 | xfs_da_intnode_t *oldroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | xfs_da_args_t *args; |
| 722 | xfs_dablk_t child; |
| 723 | xfs_dabuf_t *bp; |
| 724 | int error; |
| 725 | |
| 726 | args = state->args; |
| 727 | ASSERT(args != NULL); |
| 728 | ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC); |
| 729 | oldroot = root_blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 730 | ASSERT(oldroot->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | ASSERT(!oldroot->hdr.info.forw); |
| 732 | ASSERT(!oldroot->hdr.info.back); |
| 733 | |
| 734 | /* |
| 735 | * If the root has more than one child, then don't do anything. |
| 736 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 737 | if (be16_to_cpu(oldroot->hdr.count) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | return(0); |
| 739 | |
| 740 | /* |
| 741 | * Read in the (only) child block, then copy those bytes into |
| 742 | * the root block's buffer and free the original child block. |
| 743 | */ |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 744 | child = be32_to_cpu(oldroot->btree[0].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | ASSERT(child != 0); |
| 746 | error = xfs_da_read_buf(args->trans, args->dp, child, -1, &bp, |
| 747 | args->whichfork); |
| 748 | if (error) |
| 749 | return(error); |
| 750 | ASSERT(bp != NULL); |
Alex Elder | 1c4f332 | 2011-07-18 18:14:09 +0000 | [diff] [blame] | 751 | xfs_da_blkinfo_onlychild_validate(bp->data, |
| 752 | be16_to_cpu(oldroot->hdr.level)); |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | memcpy(root_blk->bp->data, bp->data, state->blocksize); |
| 755 | xfs_da_log_buf(args->trans, root_blk->bp, 0, state->blocksize - 1); |
| 756 | error = xfs_da_shrink_inode(args, child, bp); |
| 757 | return(error); |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Check a node block and its neighbors to see if the block should be |
| 762 | * collapsed into one or the other neighbor. Always keep the block |
| 763 | * with the smaller block number. |
| 764 | * If the current block is over 50% full, don't try to join it, return 0. |
| 765 | * If the block is empty, fill in the state structure and return 2. |
| 766 | * If it can be collapsed, fill in the state structure and return 1. |
| 767 | * If nothing can be done, return 0. |
| 768 | */ |
| 769 | STATIC int |
| 770 | xfs_da_node_toosmall(xfs_da_state_t *state, int *action) |
| 771 | { |
| 772 | xfs_da_intnode_t *node; |
| 773 | xfs_da_state_blk_t *blk; |
| 774 | xfs_da_blkinfo_t *info; |
| 775 | int count, forward, error, retval, i; |
| 776 | xfs_dablk_t blkno; |
| 777 | xfs_dabuf_t *bp; |
| 778 | |
| 779 | /* |
| 780 | * Check for the degenerate case of the block being over 50% full. |
| 781 | * If so, it's not worth even looking to see if we might be able |
| 782 | * to coalesce with a sibling. |
| 783 | */ |
| 784 | blk = &state->path.blk[ state->path.active-1 ]; |
| 785 | info = blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 786 | ASSERT(info->magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | node = (xfs_da_intnode_t *)info; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 788 | count = be16_to_cpu(node->hdr.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | if (count > (state->node_ents >> 1)) { |
| 790 | *action = 0; /* blk over 50%, don't try to join */ |
| 791 | return(0); /* blk over 50%, don't try to join */ |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * Check for the degenerate case of the block being empty. |
| 796 | * If the block is empty, we'll simply delete it, no need to |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 797 | * coalesce it with a sibling block. We choose (arbitrarily) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | * to merge with the forward block unless it is NULL. |
| 799 | */ |
| 800 | if (count == 0) { |
| 801 | /* |
| 802 | * Make altpath point to the block we want to keep and |
| 803 | * path point to the block we want to drop (this one). |
| 804 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 805 | forward = (info->forw != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | memcpy(&state->altpath, &state->path, sizeof(state->path)); |
| 807 | error = xfs_da_path_shift(state, &state->altpath, forward, |
| 808 | 0, &retval); |
| 809 | if (error) |
| 810 | return(error); |
| 811 | if (retval) { |
| 812 | *action = 0; |
| 813 | } else { |
| 814 | *action = 2; |
| 815 | } |
| 816 | return(0); |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Examine each sibling block to see if we can coalesce with |
| 821 | * at least 25% free space to spare. We need to figure out |
| 822 | * whether to merge with the forward or the backward block. |
| 823 | * We prefer coalescing with the lower numbered sibling so as |
| 824 | * to shrink a directory over time. |
| 825 | */ |
| 826 | /* start with smaller blk num */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 827 | forward = (be32_to_cpu(info->forw) < be32_to_cpu(info->back)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | for (i = 0; i < 2; forward = !forward, i++) { |
| 829 | if (forward) |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 830 | blkno = be32_to_cpu(info->forw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | else |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 832 | blkno = be32_to_cpu(info->back); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | if (blkno == 0) |
| 834 | continue; |
| 835 | error = xfs_da_read_buf(state->args->trans, state->args->dp, |
| 836 | blkno, -1, &bp, state->args->whichfork); |
| 837 | if (error) |
| 838 | return(error); |
| 839 | ASSERT(bp != NULL); |
| 840 | |
| 841 | node = (xfs_da_intnode_t *)info; |
| 842 | count = state->node_ents; |
| 843 | count -= state->node_ents >> 2; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 844 | count -= be16_to_cpu(node->hdr.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | node = bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 846 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 847 | count -= be16_to_cpu(node->hdr.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | xfs_da_brelse(state->args->trans, bp); |
| 849 | if (count >= 0) |
| 850 | break; /* fits with at least 25% to spare */ |
| 851 | } |
| 852 | if (i >= 2) { |
| 853 | *action = 0; |
| 854 | return(0); |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | * Make altpath point to the block we want to keep (the lower |
| 859 | * numbered block) and path point to the block we want to drop. |
| 860 | */ |
| 861 | memcpy(&state->altpath, &state->path, sizeof(state->path)); |
| 862 | if (blkno < blk->blkno) { |
| 863 | error = xfs_da_path_shift(state, &state->altpath, forward, |
| 864 | 0, &retval); |
| 865 | if (error) { |
| 866 | return(error); |
| 867 | } |
| 868 | if (retval) { |
| 869 | *action = 0; |
| 870 | return(0); |
| 871 | } |
| 872 | } else { |
| 873 | error = xfs_da_path_shift(state, &state->path, forward, |
| 874 | 0, &retval); |
| 875 | if (error) { |
| 876 | return(error); |
| 877 | } |
| 878 | if (retval) { |
| 879 | *action = 0; |
| 880 | return(0); |
| 881 | } |
| 882 | } |
| 883 | *action = 1; |
| 884 | return(0); |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * Walk back up the tree adjusting hash values as necessary, |
| 889 | * when we stop making changes, return. |
| 890 | */ |
| 891 | void |
| 892 | xfs_da_fixhashpath(xfs_da_state_t *state, xfs_da_state_path_t *path) |
| 893 | { |
| 894 | xfs_da_state_blk_t *blk; |
| 895 | xfs_da_intnode_t *node; |
| 896 | xfs_da_node_entry_t *btree; |
| 897 | xfs_dahash_t lasthash=0; |
| 898 | int level, count; |
| 899 | |
| 900 | level = path->active-1; |
| 901 | blk = &path->blk[ level ]; |
| 902 | switch (blk->magic) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | case XFS_ATTR_LEAF_MAGIC: |
| 904 | lasthash = xfs_attr_leaf_lasthash(blk->bp, &count); |
| 905 | if (count == 0) |
| 906 | return; |
| 907 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | case XFS_DIR2_LEAFN_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | lasthash = xfs_dir2_leafn_lasthash(blk->bp, &count); |
| 910 | if (count == 0) |
| 911 | return; |
| 912 | break; |
| 913 | case XFS_DA_NODE_MAGIC: |
| 914 | lasthash = xfs_da_node_lasthash(blk->bp, &count); |
| 915 | if (count == 0) |
| 916 | return; |
| 917 | break; |
| 918 | } |
| 919 | for (blk--, level--; level >= 0; blk--, level--) { |
| 920 | node = blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 921 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | btree = &node->btree[ blk->index ]; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 923 | if (be32_to_cpu(btree->hashval) == lasthash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | break; |
| 925 | blk->hashval = lasthash; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 926 | btree->hashval = cpu_to_be32(lasthash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | xfs_da_log_buf(state->args->trans, blk->bp, |
| 928 | XFS_DA_LOGRANGE(node, btree, sizeof(*btree))); |
| 929 | |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 930 | lasthash = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * Remove an entry from an intermediate node. |
| 936 | */ |
| 937 | STATIC void |
| 938 | xfs_da_node_remove(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk) |
| 939 | { |
| 940 | xfs_da_intnode_t *node; |
| 941 | xfs_da_node_entry_t *btree; |
| 942 | int tmp; |
| 943 | |
| 944 | node = drop_blk->bp->data; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 945 | ASSERT(drop_blk->index < be16_to_cpu(node->hdr.count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | ASSERT(drop_blk->index >= 0); |
| 947 | |
| 948 | /* |
| 949 | * Copy over the offending entry, or just zero it out. |
| 950 | */ |
| 951 | btree = &node->btree[drop_blk->index]; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 952 | if (drop_blk->index < (be16_to_cpu(node->hdr.count)-1)) { |
| 953 | tmp = be16_to_cpu(node->hdr.count) - drop_blk->index - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | tmp *= (uint)sizeof(xfs_da_node_entry_t); |
| 955 | memmove(btree, btree + 1, tmp); |
| 956 | xfs_da_log_buf(state->args->trans, drop_blk->bp, |
| 957 | XFS_DA_LOGRANGE(node, btree, tmp)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 958 | btree = &node->btree[be16_to_cpu(node->hdr.count)-1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | memset((char *)btree, 0, sizeof(xfs_da_node_entry_t)); |
| 961 | xfs_da_log_buf(state->args->trans, drop_blk->bp, |
| 962 | XFS_DA_LOGRANGE(node, btree, sizeof(*btree))); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 963 | be16_add_cpu(&node->hdr.count, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | xfs_da_log_buf(state->args->trans, drop_blk->bp, |
| 965 | XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr))); |
| 966 | |
| 967 | /* |
| 968 | * Copy the last hash value from the block to propagate upwards. |
| 969 | */ |
| 970 | btree--; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 971 | drop_blk->hashval = be32_to_cpu(btree->hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | /* |
| 975 | * Unbalance the btree elements between two intermediate nodes, |
| 976 | * move all Btree elements from one node into another. |
| 977 | */ |
| 978 | STATIC void |
| 979 | xfs_da_node_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, |
| 980 | xfs_da_state_blk_t *save_blk) |
| 981 | { |
| 982 | xfs_da_intnode_t *drop_node, *save_node; |
| 983 | xfs_da_node_entry_t *btree; |
| 984 | int tmp; |
| 985 | xfs_trans_t *tp; |
| 986 | |
| 987 | drop_node = drop_blk->bp->data; |
| 988 | save_node = save_blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 989 | ASSERT(drop_node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
| 990 | ASSERT(save_node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | tp = state->args->trans; |
| 992 | |
| 993 | /* |
| 994 | * If the dying block has lower hashvals, then move all the |
| 995 | * elements in the remaining block up to make a hole. |
| 996 | */ |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 997 | if ((be32_to_cpu(drop_node->btree[0].hashval) < be32_to_cpu(save_node->btree[ 0 ].hashval)) || |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 998 | (be32_to_cpu(drop_node->btree[be16_to_cpu(drop_node->hdr.count)-1].hashval) < |
| 999 | be32_to_cpu(save_node->btree[be16_to_cpu(save_node->hdr.count)-1].hashval))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | { |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1001 | btree = &save_node->btree[be16_to_cpu(drop_node->hdr.count)]; |
| 1002 | tmp = be16_to_cpu(save_node->hdr.count) * (uint)sizeof(xfs_da_node_entry_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | memmove(btree, &save_node->btree[0], tmp); |
| 1004 | btree = &save_node->btree[0]; |
| 1005 | xfs_da_log_buf(tp, save_blk->bp, |
| 1006 | XFS_DA_LOGRANGE(save_node, btree, |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1007 | (be16_to_cpu(save_node->hdr.count) + be16_to_cpu(drop_node->hdr.count)) * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | sizeof(xfs_da_node_entry_t))); |
| 1009 | } else { |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1010 | btree = &save_node->btree[be16_to_cpu(save_node->hdr.count)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | xfs_da_log_buf(tp, save_blk->bp, |
| 1012 | XFS_DA_LOGRANGE(save_node, btree, |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1013 | be16_to_cpu(drop_node->hdr.count) * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | sizeof(xfs_da_node_entry_t))); |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | * Move all the B-tree elements from drop_blk to save_blk. |
| 1019 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1020 | tmp = be16_to_cpu(drop_node->hdr.count) * (uint)sizeof(xfs_da_node_entry_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | memcpy(btree, &drop_node->btree[0], tmp); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 1022 | be16_add_cpu(&save_node->hdr.count, be16_to_cpu(drop_node->hdr.count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
| 1024 | xfs_da_log_buf(tp, save_blk->bp, |
| 1025 | XFS_DA_LOGRANGE(save_node, &save_node->hdr, |
| 1026 | sizeof(save_node->hdr))); |
| 1027 | |
| 1028 | /* |
| 1029 | * Save the last hashval in the remaining block for upward propagation. |
| 1030 | */ |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1031 | save_blk->hashval = be32_to_cpu(save_node->btree[be16_to_cpu(save_node->hdr.count)-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |
| 1033 | |
| 1034 | /*======================================================================== |
| 1035 | * Routines used for finding things in the Btree. |
| 1036 | *========================================================================*/ |
| 1037 | |
| 1038 | /* |
| 1039 | * Walk down the Btree looking for a particular filename, filling |
| 1040 | * in the state structure as we go. |
| 1041 | * |
| 1042 | * We will set the state structure to point to each of the elements |
| 1043 | * in each of the nodes where either the hashval is or should be. |
| 1044 | * |
| 1045 | * We support duplicate hashval's so for each entry in the current |
| 1046 | * node that could contain the desired hashval, descend. This is a |
| 1047 | * pruned depth-first tree search. |
| 1048 | */ |
| 1049 | int /* error */ |
| 1050 | xfs_da_node_lookup_int(xfs_da_state_t *state, int *result) |
| 1051 | { |
| 1052 | xfs_da_state_blk_t *blk; |
| 1053 | xfs_da_blkinfo_t *curr; |
| 1054 | xfs_da_intnode_t *node; |
| 1055 | xfs_da_node_entry_t *btree; |
| 1056 | xfs_dablk_t blkno; |
| 1057 | int probe, span, max, error, retval; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1058 | xfs_dahash_t hashval, btreehashval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | xfs_da_args_t *args; |
| 1060 | |
| 1061 | args = state->args; |
| 1062 | |
| 1063 | /* |
| 1064 | * Descend thru the B-tree searching each level for the right |
| 1065 | * node to use, until the right hashval is found. |
| 1066 | */ |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1067 | blkno = (args->whichfork == XFS_DATA_FORK)? state->mp->m_dirleafblk : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | for (blk = &state->path.blk[0], state->path.active = 1; |
| 1069 | state->path.active <= XFS_DA_NODE_MAXDEPTH; |
| 1070 | blk++, state->path.active++) { |
| 1071 | /* |
| 1072 | * Read the next node down in the tree. |
| 1073 | */ |
| 1074 | blk->blkno = blkno; |
| 1075 | error = xfs_da_read_buf(args->trans, args->dp, blkno, |
| 1076 | -1, &blk->bp, args->whichfork); |
| 1077 | if (error) { |
| 1078 | blk->blkno = 0; |
| 1079 | state->path.active--; |
| 1080 | return(error); |
| 1081 | } |
| 1082 | curr = blk->bp->data; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1083 | blk->magic = be16_to_cpu(curr->magic); |
| 1084 | ASSERT(blk->magic == XFS_DA_NODE_MAGIC || |
| 1085 | blk->magic == XFS_DIR2_LEAFN_MAGIC || |
| 1086 | blk->magic == XFS_ATTR_LEAF_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | /* |
| 1089 | * Search an intermediate node for a match. |
| 1090 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1091 | if (blk->magic == XFS_DA_NODE_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | node = blk->bp->data; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1093 | max = be16_to_cpu(node->hdr.count); |
Lachlan McIlroy | 1c91ad3 | 2007-02-10 18:35:27 +1100 | [diff] [blame] | 1094 | blk->hashval = be32_to_cpu(node->btree[max-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | |
| 1096 | /* |
| 1097 | * Binary search. (note: small blocks will skip loop) |
| 1098 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | probe = span = max / 2; |
| 1100 | hashval = args->hashval; |
| 1101 | for (btree = &node->btree[probe]; span > 4; |
| 1102 | btree = &node->btree[probe]) { |
| 1103 | span /= 2; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1104 | btreehashval = be32_to_cpu(btree->hashval); |
| 1105 | if (btreehashval < hashval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | probe += span; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1107 | else if (btreehashval > hashval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | probe -= span; |
| 1109 | else |
| 1110 | break; |
| 1111 | } |
| 1112 | ASSERT((probe >= 0) && (probe < max)); |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1113 | ASSERT((span <= 4) || (be32_to_cpu(btree->hashval) == hashval)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | |
| 1115 | /* |
| 1116 | * Since we may have duplicate hashval's, find the first |
| 1117 | * matching hashval in the node. |
| 1118 | */ |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1119 | while ((probe > 0) && (be32_to_cpu(btree->hashval) >= hashval)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | btree--; |
| 1121 | probe--; |
| 1122 | } |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1123 | while ((probe < max) && (be32_to_cpu(btree->hashval) < hashval)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | btree++; |
| 1125 | probe++; |
| 1126 | } |
| 1127 | |
| 1128 | /* |
| 1129 | * Pick the right block to descend on. |
| 1130 | */ |
| 1131 | if (probe == max) { |
| 1132 | blk->index = max-1; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1133 | blkno = be32_to_cpu(node->btree[max-1].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | } else { |
| 1135 | blk->index = probe; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1136 | blkno = be32_to_cpu(btree->before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | } |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1138 | } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL); |
| 1140 | break; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1141 | } else if (blk->magic == XFS_DIR2_LEAFN_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, NULL); |
| 1143 | break; |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | /* |
| 1148 | * A leaf block that ends in the hashval that we are interested in |
| 1149 | * (final hashval == search hashval) means that the next block may |
| 1150 | * contain more entries with the same hashval, shift upward to the |
| 1151 | * next leaf and keep searching. |
| 1152 | */ |
| 1153 | for (;;) { |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1154 | if (blk->magic == XFS_DIR2_LEAFN_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | retval = xfs_dir2_leafn_lookup_int(blk->bp, args, |
| 1156 | &blk->index, state); |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1157 | } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | retval = xfs_attr_leaf_lookup_int(blk->bp, args); |
| 1159 | blk->index = args->index; |
| 1160 | args->blkno = blk->blkno; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1161 | } else { |
| 1162 | ASSERT(0); |
| 1163 | return XFS_ERROR(EFSCORRUPTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | if (((retval == ENOENT) || (retval == ENOATTR)) && |
| 1166 | (blk->hashval == args->hashval)) { |
| 1167 | error = xfs_da_path_shift(state, &state->path, 1, 1, |
| 1168 | &retval); |
| 1169 | if (error) |
| 1170 | return(error); |
| 1171 | if (retval == 0) { |
| 1172 | continue; |
Nathan Scott | d432c80 | 2006-09-28 11:03:44 +1000 | [diff] [blame] | 1173 | } else if (blk->magic == XFS_ATTR_LEAF_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | /* path_shift() gives ENOENT */ |
| 1175 | retval = XFS_ERROR(ENOATTR); |
| 1176 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | } |
| 1178 | break; |
| 1179 | } |
| 1180 | *result = retval; |
| 1181 | return(0); |
| 1182 | } |
| 1183 | |
| 1184 | /*======================================================================== |
| 1185 | * Utility routines. |
| 1186 | *========================================================================*/ |
| 1187 | |
| 1188 | /* |
| 1189 | * Link a new block into a doubly linked list of blocks (of whatever type). |
| 1190 | */ |
| 1191 | int /* error */ |
| 1192 | xfs_da_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk, |
| 1193 | xfs_da_state_blk_t *new_blk) |
| 1194 | { |
| 1195 | xfs_da_blkinfo_t *old_info, *new_info, *tmp_info; |
| 1196 | xfs_da_args_t *args; |
| 1197 | int before=0, error; |
| 1198 | xfs_dabuf_t *bp; |
| 1199 | |
| 1200 | /* |
| 1201 | * Set up environment. |
| 1202 | */ |
| 1203 | args = state->args; |
| 1204 | ASSERT(args != NULL); |
| 1205 | old_info = old_blk->bp->data; |
| 1206 | new_info = new_blk->bp->data; |
| 1207 | ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC || |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1208 | old_blk->magic == XFS_DIR2_LEAFN_MAGIC || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | old_blk->magic == XFS_ATTR_LEAF_MAGIC); |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1210 | ASSERT(old_blk->magic == be16_to_cpu(old_info->magic)); |
| 1211 | ASSERT(new_blk->magic == be16_to_cpu(new_info->magic)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | ASSERT(old_blk->magic == new_blk->magic); |
| 1213 | |
| 1214 | switch (old_blk->magic) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | case XFS_ATTR_LEAF_MAGIC: |
| 1216 | before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp); |
| 1217 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | case XFS_DIR2_LEAFN_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | before = xfs_dir2_leafn_order(old_blk->bp, new_blk->bp); |
| 1220 | break; |
| 1221 | case XFS_DA_NODE_MAGIC: |
| 1222 | before = xfs_da_node_order(old_blk->bp, new_blk->bp); |
| 1223 | break; |
| 1224 | } |
| 1225 | |
| 1226 | /* |
| 1227 | * Link blocks in appropriate order. |
| 1228 | */ |
| 1229 | if (before) { |
| 1230 | /* |
| 1231 | * Link new block in before existing block. |
| 1232 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1233 | new_info->forw = cpu_to_be32(old_blk->blkno); |
| 1234 | new_info->back = old_info->back; |
| 1235 | if (old_info->back) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | error = xfs_da_read_buf(args->trans, args->dp, |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1237 | be32_to_cpu(old_info->back), |
| 1238 | -1, &bp, args->whichfork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | if (error) |
| 1240 | return(error); |
| 1241 | ASSERT(bp != NULL); |
| 1242 | tmp_info = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1243 | ASSERT(be16_to_cpu(tmp_info->magic) == be16_to_cpu(old_info->magic)); |
| 1244 | ASSERT(be32_to_cpu(tmp_info->forw) == old_blk->blkno); |
| 1245 | tmp_info->forw = cpu_to_be32(new_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1); |
| 1247 | xfs_da_buf_done(bp); |
| 1248 | } |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1249 | old_info->back = cpu_to_be32(new_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | } else { |
| 1251 | /* |
| 1252 | * Link new block in after existing block. |
| 1253 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1254 | new_info->forw = old_info->forw; |
| 1255 | new_info->back = cpu_to_be32(old_blk->blkno); |
| 1256 | if (old_info->forw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | error = xfs_da_read_buf(args->trans, args->dp, |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1258 | be32_to_cpu(old_info->forw), |
| 1259 | -1, &bp, args->whichfork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | if (error) |
| 1261 | return(error); |
| 1262 | ASSERT(bp != NULL); |
| 1263 | tmp_info = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1264 | ASSERT(tmp_info->magic == old_info->magic); |
| 1265 | ASSERT(be32_to_cpu(tmp_info->back) == old_blk->blkno); |
| 1266 | tmp_info->back = cpu_to_be32(new_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1); |
| 1268 | xfs_da_buf_done(bp); |
| 1269 | } |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1270 | old_info->forw = cpu_to_be32(new_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | xfs_da_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1); |
| 1274 | xfs_da_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1); |
| 1275 | return(0); |
| 1276 | } |
| 1277 | |
| 1278 | /* |
| 1279 | * Compare two intermediate nodes for "order". |
| 1280 | */ |
| 1281 | STATIC int |
| 1282 | xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp) |
| 1283 | { |
| 1284 | xfs_da_intnode_t *node1, *node2; |
| 1285 | |
| 1286 | node1 = node1_bp->data; |
| 1287 | node2 = node2_bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1288 | ASSERT(node1->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC) && |
| 1289 | node2->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1290 | if ((be16_to_cpu(node1->hdr.count) > 0) && (be16_to_cpu(node2->hdr.count) > 0) && |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1291 | ((be32_to_cpu(node2->btree[0].hashval) < |
| 1292 | be32_to_cpu(node1->btree[0].hashval)) || |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1293 | (be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval) < |
| 1294 | be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | return(1); |
| 1296 | } |
| 1297 | return(0); |
| 1298 | } |
| 1299 | |
| 1300 | /* |
| 1301 | * Pick up the last hashvalue from an intermediate node. |
| 1302 | */ |
| 1303 | STATIC uint |
| 1304 | xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count) |
| 1305 | { |
| 1306 | xfs_da_intnode_t *node; |
| 1307 | |
| 1308 | node = bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1309 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | if (count) |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1311 | *count = be16_to_cpu(node->hdr.count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | if (!node->hdr.count) |
| 1313 | return(0); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1314 | return be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | } |
| 1316 | |
| 1317 | /* |
| 1318 | * Unlink a block from a doubly linked list of blocks. |
| 1319 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 1320 | STATIC int /* error */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | xfs_da_blk_unlink(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk, |
| 1322 | xfs_da_state_blk_t *save_blk) |
| 1323 | { |
| 1324 | xfs_da_blkinfo_t *drop_info, *save_info, *tmp_info; |
| 1325 | xfs_da_args_t *args; |
| 1326 | xfs_dabuf_t *bp; |
| 1327 | int error; |
| 1328 | |
| 1329 | /* |
| 1330 | * Set up environment. |
| 1331 | */ |
| 1332 | args = state->args; |
| 1333 | ASSERT(args != NULL); |
| 1334 | save_info = save_blk->bp->data; |
| 1335 | drop_info = drop_blk->bp->data; |
| 1336 | ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC || |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1337 | save_blk->magic == XFS_DIR2_LEAFN_MAGIC || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | save_blk->magic == XFS_ATTR_LEAF_MAGIC); |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1339 | ASSERT(save_blk->magic == be16_to_cpu(save_info->magic)); |
| 1340 | ASSERT(drop_blk->magic == be16_to_cpu(drop_info->magic)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | ASSERT(save_blk->magic == drop_blk->magic); |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1342 | ASSERT((be32_to_cpu(save_info->forw) == drop_blk->blkno) || |
| 1343 | (be32_to_cpu(save_info->back) == drop_blk->blkno)); |
| 1344 | ASSERT((be32_to_cpu(drop_info->forw) == save_blk->blkno) || |
| 1345 | (be32_to_cpu(drop_info->back) == save_blk->blkno)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | |
| 1347 | /* |
| 1348 | * Unlink the leaf block from the doubly linked chain of leaves. |
| 1349 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1350 | if (be32_to_cpu(save_info->back) == drop_blk->blkno) { |
| 1351 | save_info->back = drop_info->back; |
| 1352 | if (drop_info->back) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | error = xfs_da_read_buf(args->trans, args->dp, |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1354 | be32_to_cpu(drop_info->back), |
| 1355 | -1, &bp, args->whichfork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | if (error) |
| 1357 | return(error); |
| 1358 | ASSERT(bp != NULL); |
| 1359 | tmp_info = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1360 | ASSERT(tmp_info->magic == save_info->magic); |
| 1361 | ASSERT(be32_to_cpu(tmp_info->forw) == drop_blk->blkno); |
| 1362 | tmp_info->forw = cpu_to_be32(save_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | xfs_da_log_buf(args->trans, bp, 0, |
| 1364 | sizeof(*tmp_info) - 1); |
| 1365 | xfs_da_buf_done(bp); |
| 1366 | } |
| 1367 | } else { |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1368 | save_info->forw = drop_info->forw; |
| 1369 | if (drop_info->forw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | error = xfs_da_read_buf(args->trans, args->dp, |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1371 | be32_to_cpu(drop_info->forw), |
| 1372 | -1, &bp, args->whichfork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | if (error) |
| 1374 | return(error); |
| 1375 | ASSERT(bp != NULL); |
| 1376 | tmp_info = bp->data; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1377 | ASSERT(tmp_info->magic == save_info->magic); |
| 1378 | ASSERT(be32_to_cpu(tmp_info->back) == drop_blk->blkno); |
| 1379 | tmp_info->back = cpu_to_be32(save_blk->blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | xfs_da_log_buf(args->trans, bp, 0, |
| 1381 | sizeof(*tmp_info) - 1); |
| 1382 | xfs_da_buf_done(bp); |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | xfs_da_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1); |
| 1387 | return(0); |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Move a path "forward" or "!forward" one block at the current level. |
| 1392 | * |
| 1393 | * This routine will adjust a "path" to point to the next block |
| 1394 | * "forward" (higher hashvalues) or "!forward" (lower hashvals) in the |
| 1395 | * Btree, including updating pointers to the intermediate nodes between |
| 1396 | * the new bottom and the root. |
| 1397 | */ |
| 1398 | int /* error */ |
| 1399 | xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path, |
| 1400 | int forward, int release, int *result) |
| 1401 | { |
| 1402 | xfs_da_state_blk_t *blk; |
| 1403 | xfs_da_blkinfo_t *info; |
| 1404 | xfs_da_intnode_t *node; |
| 1405 | xfs_da_args_t *args; |
| 1406 | xfs_dablk_t blkno=0; |
| 1407 | int level, error; |
| 1408 | |
| 1409 | /* |
| 1410 | * Roll up the Btree looking for the first block where our |
| 1411 | * current index is not at the edge of the block. Note that |
| 1412 | * we skip the bottom layer because we want the sibling block. |
| 1413 | */ |
| 1414 | args = state->args; |
| 1415 | ASSERT(args != NULL); |
| 1416 | ASSERT(path != NULL); |
| 1417 | ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH)); |
| 1418 | level = (path->active-1) - 1; /* skip bottom layer in path */ |
| 1419 | for (blk = &path->blk[level]; level >= 0; blk--, level--) { |
| 1420 | ASSERT(blk->bp != NULL); |
| 1421 | node = blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1422 | ASSERT(node->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1423 | if (forward && (blk->index < be16_to_cpu(node->hdr.count)-1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | blk->index++; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1425 | blkno = be32_to_cpu(node->btree[blk->index].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | break; |
| 1427 | } else if (!forward && (blk->index > 0)) { |
| 1428 | blk->index--; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1429 | blkno = be32_to_cpu(node->btree[blk->index].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | break; |
| 1431 | } |
| 1432 | } |
| 1433 | if (level < 0) { |
| 1434 | *result = XFS_ERROR(ENOENT); /* we're out of our tree */ |
Barry Naujok | 6a17810 | 2008-05-21 16:42:05 +1000 | [diff] [blame] | 1435 | ASSERT(args->op_flags & XFS_DA_OP_OKNOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | return(0); |
| 1437 | } |
| 1438 | |
| 1439 | /* |
| 1440 | * Roll down the edge of the subtree until we reach the |
| 1441 | * same depth we were at originally. |
| 1442 | */ |
| 1443 | for (blk++, level++; level < path->active; blk++, level++) { |
| 1444 | /* |
| 1445 | * Release the old block. |
| 1446 | * (if it's dirty, trans won't actually let go) |
| 1447 | */ |
| 1448 | if (release) |
| 1449 | xfs_da_brelse(args->trans, blk->bp); |
| 1450 | |
| 1451 | /* |
| 1452 | * Read the next child block. |
| 1453 | */ |
| 1454 | blk->blkno = blkno; |
| 1455 | error = xfs_da_read_buf(args->trans, args->dp, blkno, -1, |
| 1456 | &blk->bp, args->whichfork); |
| 1457 | if (error) |
| 1458 | return(error); |
| 1459 | ASSERT(blk->bp != NULL); |
| 1460 | info = blk->bp->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1461 | ASSERT(info->magic == cpu_to_be16(XFS_DA_NODE_MAGIC) || |
| 1462 | info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC) || |
| 1463 | info->magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC)); |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1464 | blk->magic = be16_to_cpu(info->magic); |
| 1465 | if (blk->magic == XFS_DA_NODE_MAGIC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | node = (xfs_da_intnode_t *)info; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1467 | blk->hashval = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | if (forward) |
| 1469 | blk->index = 0; |
| 1470 | else |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1471 | blk->index = be16_to_cpu(node->hdr.count)-1; |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1472 | blkno = be32_to_cpu(node->btree[blk->index].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } else { |
| 1474 | ASSERT(level == path->active-1); |
| 1475 | blk->index = 0; |
| 1476 | switch(blk->magic) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | case XFS_ATTR_LEAF_MAGIC: |
| 1478 | blk->hashval = xfs_attr_leaf_lasthash(blk->bp, |
| 1479 | NULL); |
| 1480 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | case XFS_DIR2_LEAFN_MAGIC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, |
| 1483 | NULL); |
| 1484 | break; |
| 1485 | default: |
| 1486 | ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC || |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1487 | blk->magic == XFS_DIR2_LEAFN_MAGIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | break; |
| 1489 | } |
| 1490 | } |
| 1491 | } |
| 1492 | *result = 0; |
| 1493 | return(0); |
| 1494 | } |
| 1495 | |
| 1496 | |
| 1497 | /*======================================================================== |
| 1498 | * Utility routines. |
| 1499 | *========================================================================*/ |
| 1500 | |
| 1501 | /* |
| 1502 | * Implement a simple hash on a character string. |
| 1503 | * Rotate the hash value by 7 bits, then XOR each character in. |
| 1504 | * This is implemented with some source-level loop unrolling. |
| 1505 | */ |
| 1506 | xfs_dahash_t |
Christoph Hellwig | a568778 | 2009-02-09 08:37:39 +0100 | [diff] [blame] | 1507 | xfs_da_hashname(const __uint8_t *name, int namelen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | { |
| 1509 | xfs_dahash_t hash; |
| 1510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | /* |
| 1512 | * Do four characters at a time as long as we can. |
| 1513 | */ |
| 1514 | for (hash = 0; namelen >= 4; namelen -= 4, name += 4) |
| 1515 | hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^ |
| 1516 | (name[3] << 0) ^ rol32(hash, 7 * 4); |
| 1517 | |
| 1518 | /* |
| 1519 | * Now do the rest of the characters. |
| 1520 | */ |
| 1521 | switch (namelen) { |
| 1522 | case 3: |
| 1523 | return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^ |
| 1524 | rol32(hash, 7 * 3); |
| 1525 | case 2: |
| 1526 | return (name[0] << 7) ^ (name[1] << 0) ^ rol32(hash, 7 * 2); |
| 1527 | case 1: |
| 1528 | return (name[0] << 0) ^ rol32(hash, 7 * 1); |
Nathan Scott | 2b3b6d0 | 2005-11-02 15:12:28 +1100 | [diff] [blame] | 1529 | default: /* case 0: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | return hash; |
| 1531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | } |
| 1533 | |
Barry Naujok | 5163f95 | 2008-05-21 16:41:01 +1000 | [diff] [blame] | 1534 | enum xfs_dacmp |
| 1535 | xfs_da_compname( |
| 1536 | struct xfs_da_args *args, |
Dave Chinner | 2bc7542 | 2010-01-20 10:47:17 +1100 | [diff] [blame] | 1537 | const unsigned char *name, |
| 1538 | int len) |
Barry Naujok | 5163f95 | 2008-05-21 16:41:01 +1000 | [diff] [blame] | 1539 | { |
| 1540 | return (args->namelen == len && memcmp(args->name, name, len) == 0) ? |
| 1541 | XFS_CMP_EXACT : XFS_CMP_DIFFERENT; |
| 1542 | } |
| 1543 | |
| 1544 | static xfs_dahash_t |
| 1545 | xfs_default_hashname( |
| 1546 | struct xfs_name *name) |
| 1547 | { |
| 1548 | return xfs_da_hashname(name->name, name->len); |
| 1549 | } |
| 1550 | |
| 1551 | const struct xfs_nameops xfs_default_nameops = { |
| 1552 | .hashname = xfs_default_hashname, |
| 1553 | .compname = xfs_da_compname |
| 1554 | }; |
| 1555 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | int |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1557 | xfs_da_grow_inode_int( |
| 1558 | struct xfs_da_args *args, |
| 1559 | xfs_fileoff_t *bno, |
| 1560 | int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | { |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1562 | struct xfs_trans *tp = args->trans; |
| 1563 | struct xfs_inode *dp = args->dp; |
| 1564 | int w = args->whichfork; |
| 1565 | xfs_drfsbno_t nblks = dp->i_d.di_nblocks; |
| 1566 | struct xfs_bmbt_irec map, *mapp; |
| 1567 | int nmap, error, got, i, mapi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | /* |
| 1570 | * Find a spot in the file space to put the new block. |
| 1571 | */ |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1572 | error = xfs_bmap_first_unused(tp, dp, count, bno, w); |
| 1573 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | return error; |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | /* |
| 1577 | * Try mapping it in one filesystem block. |
| 1578 | */ |
| 1579 | nmap = 1; |
| 1580 | ASSERT(args->firstblock != NULL); |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 1581 | error = xfs_bmapi_write(tp, dp, *bno, count, |
| 1582 | xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | args->firstblock, args->total, &map, &nmap, |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1584 | args->flist); |
| 1585 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | return error; |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | ASSERT(nmap <= 1); |
| 1589 | if (nmap == 1) { |
| 1590 | mapp = ↦ |
| 1591 | mapi = 1; |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1592 | } else if (nmap == 0 && count > 1) { |
| 1593 | xfs_fileoff_t b; |
| 1594 | int c; |
| 1595 | |
| 1596 | /* |
| 1597 | * If we didn't get it and the block might work if fragmented, |
| 1598 | * try without the CONTIG flag. Loop until we get it all. |
| 1599 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP); |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1601 | for (b = *bno, mapi = 0; b < *bno + count; ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | nmap = MIN(XFS_BMAP_MAX_NMAP, count); |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1603 | c = (int)(*bno + count - b); |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 1604 | error = xfs_bmapi_write(tp, dp, b, c, |
| 1605 | xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | args->firstblock, args->total, |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1607 | &mapp[mapi], &nmap, args->flist); |
| 1608 | if (error) |
| 1609 | goto out_free_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | if (nmap < 1) |
| 1611 | break; |
| 1612 | mapi += nmap; |
| 1613 | b = mapp[mapi - 1].br_startoff + |
| 1614 | mapp[mapi - 1].br_blockcount; |
| 1615 | } |
| 1616 | } else { |
| 1617 | mapi = 0; |
| 1618 | mapp = NULL; |
| 1619 | } |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | /* |
| 1622 | * Count the blocks we got, make sure it matches the total. |
| 1623 | */ |
| 1624 | for (i = 0, got = 0; i < mapi; i++) |
| 1625 | got += mapp[i].br_blockcount; |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1626 | if (got != count || mapp[0].br_startoff != *bno || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount != |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1628 | *bno + count) { |
| 1629 | error = XFS_ERROR(ENOSPC); |
| 1630 | goto out_free_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | } |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1632 | |
David Chinner | a744405 | 2008-10-30 17:38:12 +1100 | [diff] [blame] | 1633 | /* account for newly allocated blocks in reserved blocks total */ |
| 1634 | args->total -= dp->i_d.di_nblocks - nblks; |
Christoph Hellwig | 77936d0 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 1635 | |
| 1636 | out_free_map: |
| 1637 | if (mapp != &map) |
| 1638 | kmem_free(mapp); |
| 1639 | return error; |
| 1640 | } |
| 1641 | |
| 1642 | /* |
| 1643 | * Add a block to the btree ahead of the file. |
| 1644 | * Return the new block number to the caller. |
| 1645 | */ |
| 1646 | int |
| 1647 | xfs_da_grow_inode( |
| 1648 | struct xfs_da_args *args, |
| 1649 | xfs_dablk_t *new_blkno) |
| 1650 | { |
| 1651 | xfs_fileoff_t bno; |
| 1652 | int count; |
| 1653 | int error; |
| 1654 | |
| 1655 | if (args->whichfork == XFS_DATA_FORK) { |
| 1656 | bno = args->dp->i_mount->m_dirleafblk; |
| 1657 | count = args->dp->i_mount->m_dirblkfsbs; |
| 1658 | } else { |
| 1659 | bno = 0; |
| 1660 | count = 1; |
| 1661 | } |
| 1662 | |
| 1663 | error = xfs_da_grow_inode_int(args, &bno, count); |
| 1664 | if (!error) |
| 1665 | *new_blkno = (xfs_dablk_t)bno; |
| 1666 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | } |
| 1668 | |
| 1669 | /* |
| 1670 | * Ick. We need to always be able to remove a btree block, even |
| 1671 | * if there's no space reservation because the filesystem is full. |
| 1672 | * This is called if xfs_bunmapi on a btree block fails due to ENOSPC. |
| 1673 | * It swaps the target block with the last block in the file. The |
| 1674 | * last block in the file can always be removed since it can't cause |
| 1675 | * a bmap btree split to do that. |
| 1676 | */ |
| 1677 | STATIC int |
| 1678 | xfs_da_swap_lastblock(xfs_da_args_t *args, xfs_dablk_t *dead_blknop, |
| 1679 | xfs_dabuf_t **dead_bufp) |
| 1680 | { |
| 1681 | xfs_dablk_t dead_blkno, last_blkno, sib_blkno, par_blkno; |
| 1682 | xfs_dabuf_t *dead_buf, *last_buf, *sib_buf, *par_buf; |
| 1683 | xfs_fileoff_t lastoff; |
| 1684 | xfs_inode_t *ip; |
| 1685 | xfs_trans_t *tp; |
| 1686 | xfs_mount_t *mp; |
| 1687 | int error, w, entno, level, dead_level; |
| 1688 | xfs_da_blkinfo_t *dead_info, *sib_info; |
| 1689 | xfs_da_intnode_t *par_node, *dead_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | xfs_dir2_leaf_t *dead_leaf2; |
| 1691 | xfs_dahash_t dead_hash; |
| 1692 | |
| 1693 | dead_buf = *dead_bufp; |
| 1694 | dead_blkno = *dead_blknop; |
| 1695 | tp = args->trans; |
| 1696 | ip = args->dp; |
| 1697 | w = args->whichfork; |
| 1698 | ASSERT(w == XFS_DATA_FORK); |
| 1699 | mp = ip->i_mount; |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1700 | lastoff = mp->m_dirfreeblk; |
| 1701 | error = xfs_bmap_last_before(tp, ip, &lastoff, w); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | if (error) |
| 1703 | return error; |
| 1704 | if (unlikely(lastoff == 0)) { |
| 1705 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(1)", XFS_ERRLEVEL_LOW, |
| 1706 | mp); |
| 1707 | return XFS_ERROR(EFSCORRUPTED); |
| 1708 | } |
| 1709 | /* |
| 1710 | * Read the last block in the btree space. |
| 1711 | */ |
| 1712 | last_blkno = (xfs_dablk_t)lastoff - mp->m_dirblkfsbs; |
| 1713 | if ((error = xfs_da_read_buf(tp, ip, last_blkno, -1, &last_buf, w))) |
| 1714 | return error; |
| 1715 | /* |
| 1716 | * Copy the last block into the dead buffer and log it. |
| 1717 | */ |
| 1718 | memcpy(dead_buf->data, last_buf->data, mp->m_dirblksize); |
| 1719 | xfs_da_log_buf(tp, dead_buf, 0, mp->m_dirblksize - 1); |
| 1720 | dead_info = dead_buf->data; |
| 1721 | /* |
| 1722 | * Get values from the moved block. |
| 1723 | */ |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1724 | if (dead_info->magic == cpu_to_be16(XFS_DIR2_LEAFN_MAGIC)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | dead_leaf2 = (xfs_dir2_leaf_t *)dead_info; |
| 1726 | dead_level = 0; |
Nathan Scott | 3c1f9c1 | 2006-03-17 17:28:18 +1100 | [diff] [blame] | 1727 | dead_hash = be32_to_cpu(dead_leaf2->ents[be16_to_cpu(dead_leaf2->hdr.count) - 1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | } else { |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1729 | ASSERT(dead_info->magic == cpu_to_be16(XFS_DA_NODE_MAGIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | dead_node = (xfs_da_intnode_t *)dead_info; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1731 | dead_level = be16_to_cpu(dead_node->hdr.level); |
| 1732 | dead_hash = be32_to_cpu(dead_node->btree[be16_to_cpu(dead_node->hdr.count) - 1].hashval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | sib_buf = par_buf = NULL; |
| 1735 | /* |
| 1736 | * If the moved block has a left sibling, fix up the pointers. |
| 1737 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1738 | if ((sib_blkno = be32_to_cpu(dead_info->back))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w))) |
| 1740 | goto done; |
| 1741 | sib_info = sib_buf->data; |
| 1742 | if (unlikely( |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1743 | be32_to_cpu(sib_info->forw) != last_blkno || |
| 1744 | sib_info->magic != dead_info->magic)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(2)", |
| 1746 | XFS_ERRLEVEL_LOW, mp); |
| 1747 | error = XFS_ERROR(EFSCORRUPTED); |
| 1748 | goto done; |
| 1749 | } |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1750 | sib_info->forw = cpu_to_be32(dead_blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | xfs_da_log_buf(tp, sib_buf, |
| 1752 | XFS_DA_LOGRANGE(sib_info, &sib_info->forw, |
| 1753 | sizeof(sib_info->forw))); |
| 1754 | xfs_da_buf_done(sib_buf); |
| 1755 | sib_buf = NULL; |
| 1756 | } |
| 1757 | /* |
| 1758 | * If the moved block has a right sibling, fix up the pointers. |
| 1759 | */ |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1760 | if ((sib_blkno = be32_to_cpu(dead_info->forw))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w))) |
| 1762 | goto done; |
| 1763 | sib_info = sib_buf->data; |
| 1764 | if (unlikely( |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1765 | be32_to_cpu(sib_info->back) != last_blkno || |
| 1766 | sib_info->magic != dead_info->magic)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(3)", |
| 1768 | XFS_ERRLEVEL_LOW, mp); |
| 1769 | error = XFS_ERROR(EFSCORRUPTED); |
| 1770 | goto done; |
| 1771 | } |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1772 | sib_info->back = cpu_to_be32(dead_blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | xfs_da_log_buf(tp, sib_buf, |
| 1774 | XFS_DA_LOGRANGE(sib_info, &sib_info->back, |
| 1775 | sizeof(sib_info->back))); |
| 1776 | xfs_da_buf_done(sib_buf); |
| 1777 | sib_buf = NULL; |
| 1778 | } |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1779 | par_blkno = mp->m_dirleafblk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | level = -1; |
| 1781 | /* |
| 1782 | * Walk down the tree looking for the parent of the moved block. |
| 1783 | */ |
| 1784 | for (;;) { |
| 1785 | if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w))) |
| 1786 | goto done; |
| 1787 | par_node = par_buf->data; |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1788 | if (unlikely(par_node->hdr.info.magic != |
| 1789 | cpu_to_be16(XFS_DA_NODE_MAGIC) || |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1790 | (level >= 0 && level != be16_to_cpu(par_node->hdr.level) + 1))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(4)", |
| 1792 | XFS_ERRLEVEL_LOW, mp); |
| 1793 | error = XFS_ERROR(EFSCORRUPTED); |
| 1794 | goto done; |
| 1795 | } |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1796 | level = be16_to_cpu(par_node->hdr.level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | for (entno = 0; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1798 | entno < be16_to_cpu(par_node->hdr.count) && |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1799 | be32_to_cpu(par_node->btree[entno].hashval) < dead_hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | entno++) |
| 1801 | continue; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1802 | if (unlikely(entno == be16_to_cpu(par_node->hdr.count))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(5)", |
| 1804 | XFS_ERRLEVEL_LOW, mp); |
| 1805 | error = XFS_ERROR(EFSCORRUPTED); |
| 1806 | goto done; |
| 1807 | } |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1808 | par_blkno = be32_to_cpu(par_node->btree[entno].before); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | if (level == dead_level + 1) |
| 1810 | break; |
| 1811 | xfs_da_brelse(tp, par_buf); |
| 1812 | par_buf = NULL; |
| 1813 | } |
| 1814 | /* |
| 1815 | * We're in the right parent block. |
| 1816 | * Look for the right entry. |
| 1817 | */ |
| 1818 | for (;;) { |
| 1819 | for (; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1820 | entno < be16_to_cpu(par_node->hdr.count) && |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1821 | be32_to_cpu(par_node->btree[entno].before) != last_blkno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | entno++) |
| 1823 | continue; |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1824 | if (entno < be16_to_cpu(par_node->hdr.count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | break; |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 1826 | par_blkno = be32_to_cpu(par_node->hdr.info.forw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | xfs_da_brelse(tp, par_buf); |
| 1828 | par_buf = NULL; |
| 1829 | if (unlikely(par_blkno == 0)) { |
| 1830 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(6)", |
| 1831 | XFS_ERRLEVEL_LOW, mp); |
| 1832 | error = XFS_ERROR(EFSCORRUPTED); |
| 1833 | goto done; |
| 1834 | } |
| 1835 | if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w))) |
| 1836 | goto done; |
| 1837 | par_node = par_buf->data; |
| 1838 | if (unlikely( |
Nathan Scott | fac80cc | 2006-03-17 17:29:56 +1100 | [diff] [blame] | 1839 | be16_to_cpu(par_node->hdr.level) != level || |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 1840 | par_node->hdr.info.magic != cpu_to_be16(XFS_DA_NODE_MAGIC))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | XFS_ERROR_REPORT("xfs_da_swap_lastblock(7)", |
| 1842 | XFS_ERRLEVEL_LOW, mp); |
| 1843 | error = XFS_ERROR(EFSCORRUPTED); |
| 1844 | goto done; |
| 1845 | } |
| 1846 | entno = 0; |
| 1847 | } |
| 1848 | /* |
| 1849 | * Update the parent entry pointing to the moved block. |
| 1850 | */ |
Nathan Scott | 403432d | 2006-03-17 17:29:46 +1100 | [diff] [blame] | 1851 | par_node->btree[entno].before = cpu_to_be32(dead_blkno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | xfs_da_log_buf(tp, par_buf, |
| 1853 | XFS_DA_LOGRANGE(par_node, &par_node->btree[entno].before, |
| 1854 | sizeof(par_node->btree[entno].before))); |
| 1855 | xfs_da_buf_done(par_buf); |
| 1856 | xfs_da_buf_done(dead_buf); |
| 1857 | *dead_blknop = last_blkno; |
| 1858 | *dead_bufp = last_buf; |
| 1859 | return 0; |
| 1860 | done: |
| 1861 | if (par_buf) |
| 1862 | xfs_da_brelse(tp, par_buf); |
| 1863 | if (sib_buf) |
| 1864 | xfs_da_brelse(tp, sib_buf); |
| 1865 | xfs_da_brelse(tp, last_buf); |
| 1866 | return error; |
| 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * Remove a btree block from a directory or attribute. |
| 1871 | */ |
| 1872 | int |
| 1873 | xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno, |
| 1874 | xfs_dabuf_t *dead_buf) |
| 1875 | { |
| 1876 | xfs_inode_t *dp; |
| 1877 | int done, error, w, count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | xfs_trans_t *tp; |
| 1879 | xfs_mount_t *mp; |
| 1880 | |
| 1881 | dp = args->dp; |
| 1882 | w = args->whichfork; |
| 1883 | tp = args->trans; |
| 1884 | mp = dp->i_mount; |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1885 | if (w == XFS_DATA_FORK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | count = mp->m_dirblkfsbs; |
| 1887 | else |
| 1888 | count = 1; |
| 1889 | for (;;) { |
| 1890 | /* |
| 1891 | * Remove extents. If we get ENOSPC for a dir we have to move |
| 1892 | * the last block to the place we want to kill. |
| 1893 | */ |
| 1894 | if ((error = xfs_bunmapi(tp, dp, dead_blkno, count, |
Eric Sandeen | 9d87c31 | 2009-01-14 23:22:07 -0600 | [diff] [blame] | 1895 | xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA, |
Christoph Hellwig | b4e9181 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 1896 | 0, args->firstblock, args->flist, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | &done)) == ENOSPC) { |
| 1898 | if (w != XFS_DATA_FORK) |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1899 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | if ((error = xfs_da_swap_lastblock(args, &dead_blkno, |
| 1901 | &dead_buf))) |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1902 | break; |
| 1903 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | } |
| 1906 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | xfs_da_binval(tp, dead_buf); |
| 1908 | return error; |
| 1909 | } |
| 1910 | |
| 1911 | /* |
| 1912 | * See if the mapping(s) for this btree block are valid, i.e. |
| 1913 | * don't contain holes, are logically contiguous, and cover the whole range. |
| 1914 | */ |
| 1915 | STATIC int |
| 1916 | xfs_da_map_covers_blocks( |
| 1917 | int nmap, |
| 1918 | xfs_bmbt_irec_t *mapp, |
| 1919 | xfs_dablk_t bno, |
| 1920 | int count) |
| 1921 | { |
| 1922 | int i; |
| 1923 | xfs_fileoff_t off; |
| 1924 | |
| 1925 | for (i = 0, off = bno; i < nmap; i++) { |
| 1926 | if (mapp[i].br_startblock == HOLESTARTBLOCK || |
| 1927 | mapp[i].br_startblock == DELAYSTARTBLOCK) { |
| 1928 | return 0; |
| 1929 | } |
| 1930 | if (off != mapp[i].br_startoff) { |
| 1931 | return 0; |
| 1932 | } |
| 1933 | off += mapp[i].br_blockcount; |
| 1934 | } |
| 1935 | return off == bno + count; |
| 1936 | } |
| 1937 | |
| 1938 | /* |
| 1939 | * Make a dabuf. |
| 1940 | * Used for get_buf, read_buf, read_bufr, and reada_buf. |
| 1941 | */ |
| 1942 | STATIC int |
| 1943 | xfs_da_do_buf( |
| 1944 | xfs_trans_t *trans, |
| 1945 | xfs_inode_t *dp, |
| 1946 | xfs_dablk_t bno, |
| 1947 | xfs_daddr_t *mappedbnop, |
| 1948 | xfs_dabuf_t **bpp, |
| 1949 | int whichfork, |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 1950 | int caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | { |
| 1952 | xfs_buf_t *bp = NULL; |
| 1953 | xfs_buf_t **bplist; |
| 1954 | int error=0; |
| 1955 | int i; |
| 1956 | xfs_bmbt_irec_t map; |
| 1957 | xfs_bmbt_irec_t *mapp; |
| 1958 | xfs_daddr_t mappedbno; |
| 1959 | xfs_mount_t *mp; |
| 1960 | int nbplist=0; |
| 1961 | int nfsb; |
| 1962 | int nmap; |
| 1963 | xfs_dabuf_t *rbp; |
| 1964 | |
| 1965 | mp = dp->i_mount; |
Nathan Scott | f6c2d1f | 2006-06-20 13:04:51 +1000 | [diff] [blame] | 1966 | nfsb = (whichfork == XFS_DATA_FORK) ? mp->m_dirblkfsbs : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | mappedbno = *mappedbnop; |
| 1968 | /* |
| 1969 | * Caller doesn't have a mapping. -2 means don't complain |
| 1970 | * if we land in a hole. |
| 1971 | */ |
| 1972 | if (mappedbno == -1 || mappedbno == -2) { |
| 1973 | /* |
| 1974 | * Optimize the one-block case. |
| 1975 | */ |
Dave Chinner | 5b777ad | 2011-09-18 20:40:46 +0000 | [diff] [blame] | 1976 | if (nfsb == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | mapp = ↦ |
Dave Chinner | 5b777ad | 2011-09-18 20:40:46 +0000 | [diff] [blame] | 1978 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | mapp = kmem_alloc(sizeof(*mapp) * nfsb, KM_SLEEP); |
Dave Chinner | 5b777ad | 2011-09-18 20:40:46 +0000 | [diff] [blame] | 1980 | |
| 1981 | nmap = nfsb; |
| 1982 | error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb, mapp, |
| 1983 | &nmap, xfs_bmapi_aflag(whichfork)); |
| 1984 | if (error) |
| 1985 | goto exit0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | } else { |
| 1987 | map.br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno); |
| 1988 | map.br_startoff = (xfs_fileoff_t)bno; |
| 1989 | map.br_blockcount = nfsb; |
| 1990 | mapp = ↦ |
| 1991 | nmap = 1; |
| 1992 | } |
| 1993 | if (!xfs_da_map_covers_blocks(nmap, mapp, bno, nfsb)) { |
| 1994 | error = mappedbno == -2 ? 0 : XFS_ERROR(EFSCORRUPTED); |
| 1995 | if (unlikely(error == EFSCORRUPTED)) { |
| 1996 | if (xfs_error_level >= XFS_ERRLEVEL_LOW) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 1997 | xfs_alert(mp, "%s: bno %lld dir: inode %lld", |
| 1998 | __func__, (long long)bno, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | (long long)dp->i_ino); |
| 2000 | for (i = 0; i < nmap; i++) { |
Dave Chinner | 0b932cc | 2011-03-07 10:08:35 +1100 | [diff] [blame] | 2001 | xfs_alert(mp, |
| 2002 | "[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | i, |
| 2004 | (long long)mapp[i].br_startoff, |
| 2005 | (long long)mapp[i].br_startblock, |
| 2006 | (long long)mapp[i].br_blockcount, |
| 2007 | mapp[i].br_state); |
| 2008 | } |
| 2009 | } |
| 2010 | XFS_ERROR_REPORT("xfs_da_do_buf(1)", |
| 2011 | XFS_ERRLEVEL_LOW, mp); |
| 2012 | } |
| 2013 | goto exit0; |
| 2014 | } |
| 2015 | if (caller != 3 && nmap > 1) { |
| 2016 | bplist = kmem_alloc(sizeof(*bplist) * nmap, KM_SLEEP); |
| 2017 | nbplist = 0; |
| 2018 | } else |
| 2019 | bplist = NULL; |
| 2020 | /* |
| 2021 | * Turn the mapping(s) into buffer(s). |
| 2022 | */ |
| 2023 | for (i = 0; i < nmap; i++) { |
| 2024 | int nmapped; |
| 2025 | |
| 2026 | mappedbno = XFS_FSB_TO_DADDR(mp, mapp[i].br_startblock); |
| 2027 | if (i == 0) |
| 2028 | *mappedbnop = mappedbno; |
| 2029 | nmapped = (int)XFS_FSB_TO_BB(mp, mapp[i].br_blockcount); |
| 2030 | switch (caller) { |
| 2031 | case 0: |
| 2032 | bp = xfs_trans_get_buf(trans, mp->m_ddev_targp, |
| 2033 | mappedbno, nmapped, 0); |
Chandra Seetharaman | 5a52c2a58 | 2011-07-22 23:39:51 +0000 | [diff] [blame] | 2034 | error = bp ? bp->b_error : XFS_ERROR(EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | break; |
| 2036 | case 1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | case 2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | bp = NULL; |
| 2039 | error = xfs_trans_read_buf(mp, trans, mp->m_ddev_targp, |
| 2040 | mappedbno, nmapped, 0, &bp); |
| 2041 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | case 3: |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 2043 | xfs_buf_readahead(mp->m_ddev_targp, mappedbno, nmapped); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | error = 0; |
| 2045 | bp = NULL; |
| 2046 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | } |
| 2048 | if (error) { |
| 2049 | if (bp) |
| 2050 | xfs_trans_brelse(trans, bp); |
| 2051 | goto exit1; |
| 2052 | } |
| 2053 | if (!bp) |
| 2054 | continue; |
| 2055 | if (caller == 1) { |
| 2056 | if (whichfork == XFS_ATTR_FORK) { |
| 2057 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_ATTR_BTREE, |
| 2058 | XFS_ATTR_BTREE_REF); |
| 2059 | } else { |
| 2060 | XFS_BUF_SET_VTYPE_REF(bp, B_FS_DIR_BTREE, |
| 2061 | XFS_DIR_BTREE_REF); |
| 2062 | } |
| 2063 | } |
| 2064 | if (bplist) { |
| 2065 | bplist[nbplist++] = bp; |
| 2066 | } |
| 2067 | } |
| 2068 | /* |
| 2069 | * Build a dabuf structure. |
| 2070 | */ |
| 2071 | if (bplist) { |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2072 | rbp = xfs_da_buf_make(nbplist, bplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | } else if (bp) |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2074 | rbp = xfs_da_buf_make(1, &bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | else |
| 2076 | rbp = NULL; |
| 2077 | /* |
| 2078 | * For read_buf, check the magic number. |
| 2079 | */ |
| 2080 | if (caller == 1) { |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 2081 | xfs_dir2_data_hdr_t *hdr = rbp->data; |
| 2082 | xfs_dir2_free_t *free = rbp->data; |
| 2083 | xfs_da_blkinfo_t *info = rbp->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | uint magic, magic1; |
| 2085 | |
Nathan Scott | 89da054 | 2006-03-17 17:28:40 +1100 | [diff] [blame] | 2086 | magic = be16_to_cpu(info->magic); |
Christoph Hellwig | c2066e2 | 2011-07-08 14:35:38 +0200 | [diff] [blame] | 2087 | magic1 = be32_to_cpu(hdr->magic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | if (unlikely( |
| 2089 | XFS_TEST_ERROR((magic != XFS_DA_NODE_MAGIC) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | (magic != XFS_ATTR_LEAF_MAGIC) && |
| 2091 | (magic != XFS_DIR2_LEAF1_MAGIC) && |
| 2092 | (magic != XFS_DIR2_LEAFN_MAGIC) && |
| 2093 | (magic1 != XFS_DIR2_BLOCK_MAGIC) && |
| 2094 | (magic1 != XFS_DIR2_DATA_MAGIC) && |
Christoph Hellwig | 69ef921 | 2011-07-08 14:36:05 +0200 | [diff] [blame] | 2095 | (free->hdr.magic != cpu_to_be32(XFS_DIR2_FREE_MAGIC)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | mp, XFS_ERRTAG_DA_READ_BUF, |
| 2097 | XFS_RANDOM_DA_READ_BUF))) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 2098 | trace_xfs_da_btree_corrupt(rbp->bps[0], _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | XFS_CORRUPTION_ERROR("xfs_da_do_buf(2)", |
| 2100 | XFS_ERRLEVEL_LOW, mp, info); |
| 2101 | error = XFS_ERROR(EFSCORRUPTED); |
| 2102 | xfs_da_brelse(trans, rbp); |
| 2103 | nbplist = 0; |
| 2104 | goto exit1; |
| 2105 | } |
| 2106 | } |
| 2107 | if (bplist) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2108 | kmem_free(bplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | } |
| 2110 | if (mapp != &map) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2111 | kmem_free(mapp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | } |
| 2113 | if (bpp) |
| 2114 | *bpp = rbp; |
| 2115 | return 0; |
| 2116 | exit1: |
| 2117 | if (bplist) { |
| 2118 | for (i = 0; i < nbplist; i++) |
| 2119 | xfs_trans_brelse(trans, bplist[i]); |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2120 | kmem_free(bplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | } |
| 2122 | exit0: |
| 2123 | if (mapp != &map) |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2124 | kmem_free(mapp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | if (bpp) |
| 2126 | *bpp = NULL; |
| 2127 | return error; |
| 2128 | } |
| 2129 | |
| 2130 | /* |
| 2131 | * Get a buffer for the dir/attr block. |
| 2132 | */ |
| 2133 | int |
| 2134 | xfs_da_get_buf( |
| 2135 | xfs_trans_t *trans, |
| 2136 | xfs_inode_t *dp, |
| 2137 | xfs_dablk_t bno, |
| 2138 | xfs_daddr_t mappedbno, |
| 2139 | xfs_dabuf_t **bpp, |
| 2140 | int whichfork) |
| 2141 | { |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2142 | return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | } |
| 2144 | |
| 2145 | /* |
| 2146 | * Get a buffer for the dir/attr block, fill in the contents. |
| 2147 | */ |
| 2148 | int |
| 2149 | xfs_da_read_buf( |
| 2150 | xfs_trans_t *trans, |
| 2151 | xfs_inode_t *dp, |
| 2152 | xfs_dablk_t bno, |
| 2153 | xfs_daddr_t mappedbno, |
| 2154 | xfs_dabuf_t **bpp, |
| 2155 | int whichfork) |
| 2156 | { |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2157 | return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | } |
| 2159 | |
| 2160 | /* |
| 2161 | * Readahead the dir/attr block. |
| 2162 | */ |
| 2163 | xfs_daddr_t |
| 2164 | xfs_da_reada_buf( |
| 2165 | xfs_trans_t *trans, |
| 2166 | xfs_inode_t *dp, |
| 2167 | xfs_dablk_t bno, |
| 2168 | int whichfork) |
| 2169 | { |
| 2170 | xfs_daddr_t rval; |
| 2171 | |
| 2172 | rval = -1; |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2173 | if (xfs_da_do_buf(trans, dp, bno, &rval, NULL, whichfork, 3)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | return -1; |
| 2175 | else |
| 2176 | return rval; |
| 2177 | } |
| 2178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | kmem_zone_t *xfs_da_state_zone; /* anchor for state struct zone */ |
| 2180 | kmem_zone_t *xfs_dabuf_zone; /* dabuf zone */ |
| 2181 | |
| 2182 | /* |
| 2183 | * Allocate a dir-state structure. |
| 2184 | * We don't put them on the stack since they're large. |
| 2185 | */ |
| 2186 | xfs_da_state_t * |
| 2187 | xfs_da_state_alloc(void) |
| 2188 | { |
Christoph Hellwig | f41d7fb | 2009-07-18 18:14:55 -0400 | [diff] [blame] | 2189 | return kmem_zone_zalloc(xfs_da_state_zone, KM_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | } |
| 2191 | |
| 2192 | /* |
| 2193 | * Kill the altpath contents of a da-state structure. |
| 2194 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 2195 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | xfs_da_state_kill_altpath(xfs_da_state_t *state) |
| 2197 | { |
| 2198 | int i; |
| 2199 | |
| 2200 | for (i = 0; i < state->altpath.active; i++) { |
| 2201 | if (state->altpath.blk[i].bp) { |
| 2202 | if (state->altpath.blk[i].bp != state->path.blk[i].bp) |
| 2203 | xfs_da_buf_done(state->altpath.blk[i].bp); |
| 2204 | state->altpath.blk[i].bp = NULL; |
| 2205 | } |
| 2206 | } |
| 2207 | state->altpath.active = 0; |
| 2208 | } |
| 2209 | |
| 2210 | /* |
| 2211 | * Free a da-state structure. |
| 2212 | */ |
| 2213 | void |
| 2214 | xfs_da_state_free(xfs_da_state_t *state) |
| 2215 | { |
| 2216 | int i; |
| 2217 | |
| 2218 | xfs_da_state_kill_altpath(state); |
| 2219 | for (i = 0; i < state->path.active; i++) { |
| 2220 | if (state->path.blk[i].bp) |
| 2221 | xfs_da_buf_done(state->path.blk[i].bp); |
| 2222 | } |
| 2223 | if (state->extravalid && state->extrablk.bp) |
| 2224 | xfs_da_buf_done(state->extrablk.bp); |
| 2225 | #ifdef DEBUG |
| 2226 | memset((char *)state, 0, sizeof(*state)); |
| 2227 | #endif /* DEBUG */ |
| 2228 | kmem_zone_free(xfs_da_state_zone, state); |
| 2229 | } |
| 2230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | /* |
| 2232 | * Create a dabuf. |
| 2233 | */ |
| 2234 | /* ARGSUSED */ |
| 2235 | STATIC xfs_dabuf_t * |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2236 | xfs_da_buf_make(int nbuf, xfs_buf_t **bps) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | { |
| 2238 | xfs_buf_t *bp; |
| 2239 | xfs_dabuf_t *dabuf; |
| 2240 | int i; |
| 2241 | int off; |
| 2242 | |
| 2243 | if (nbuf == 1) |
Christoph Hellwig | 73195ed | 2009-07-18 18:14:56 -0400 | [diff] [blame] | 2244 | dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | else |
Christoph Hellwig | 73195ed | 2009-07-18 18:14:56 -0400 | [diff] [blame] | 2246 | dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | dabuf->dirty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | if (nbuf == 1) { |
| 2249 | dabuf->nbuf = 1; |
| 2250 | bp = bps[0]; |
| 2251 | dabuf->bbcount = (short)BTOBB(XFS_BUF_COUNT(bp)); |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 2252 | dabuf->data = bp->b_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | dabuf->bps[0] = bp; |
| 2254 | } else { |
| 2255 | dabuf->nbuf = nbuf; |
| 2256 | for (i = 0, dabuf->bbcount = 0; i < nbuf; i++) { |
| 2257 | dabuf->bps[i] = bp = bps[i]; |
| 2258 | dabuf->bbcount += BTOBB(XFS_BUF_COUNT(bp)); |
| 2259 | } |
| 2260 | dabuf->data = kmem_alloc(BBTOB(dabuf->bbcount), KM_SLEEP); |
| 2261 | for (i = off = 0; i < nbuf; i++, off += XFS_BUF_COUNT(bp)) { |
| 2262 | bp = bps[i]; |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 2263 | memcpy((char *)dabuf->data + off, bp->b_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | XFS_BUF_COUNT(bp)); |
| 2265 | } |
| 2266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | return dabuf; |
| 2268 | } |
| 2269 | |
| 2270 | /* |
| 2271 | * Un-dirty a dabuf. |
| 2272 | */ |
| 2273 | STATIC void |
| 2274 | xfs_da_buf_clean(xfs_dabuf_t *dabuf) |
| 2275 | { |
| 2276 | xfs_buf_t *bp; |
| 2277 | int i; |
| 2278 | int off; |
| 2279 | |
| 2280 | if (dabuf->dirty) { |
| 2281 | ASSERT(dabuf->nbuf > 1); |
| 2282 | dabuf->dirty = 0; |
| 2283 | for (i = off = 0; i < dabuf->nbuf; |
| 2284 | i++, off += XFS_BUF_COUNT(bp)) { |
| 2285 | bp = dabuf->bps[i]; |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 2286 | memcpy(bp->b_addr, dabuf->data + off, |
| 2287 | XFS_BUF_COUNT(bp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | } |
| 2289 | } |
| 2290 | } |
| 2291 | |
| 2292 | /* |
| 2293 | * Release a dabuf. |
| 2294 | */ |
| 2295 | void |
| 2296 | xfs_da_buf_done(xfs_dabuf_t *dabuf) |
| 2297 | { |
| 2298 | ASSERT(dabuf); |
| 2299 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); |
| 2300 | if (dabuf->dirty) |
| 2301 | xfs_da_buf_clean(dabuf); |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2302 | if (dabuf->nbuf > 1) { |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2303 | kmem_free(dabuf->data); |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2304 | kmem_free(dabuf); |
Christoph Hellwig | d0f9e8f | 2011-07-13 13:43:50 +0200 | [diff] [blame] | 2305 | } else { |
| 2306 | kmem_zone_free(xfs_dabuf_zone, dabuf); |
| 2307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | } |
| 2309 | |
| 2310 | /* |
| 2311 | * Log transaction from a dabuf. |
| 2312 | */ |
| 2313 | void |
| 2314 | xfs_da_log_buf(xfs_trans_t *tp, xfs_dabuf_t *dabuf, uint first, uint last) |
| 2315 | { |
| 2316 | xfs_buf_t *bp; |
| 2317 | uint f; |
| 2318 | int i; |
| 2319 | uint l; |
| 2320 | int off; |
| 2321 | |
| 2322 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); |
| 2323 | if (dabuf->nbuf == 1) { |
Chandra Seetharaman | 6292604 | 2011-07-22 23:40:15 +0000 | [diff] [blame] | 2324 | ASSERT(dabuf->data == dabuf->bps[0]->b_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | xfs_trans_log_buf(tp, dabuf->bps[0], first, last); |
| 2326 | return; |
| 2327 | } |
| 2328 | dabuf->dirty = 1; |
| 2329 | ASSERT(first <= last); |
| 2330 | for (i = off = 0; i < dabuf->nbuf; i++, off += XFS_BUF_COUNT(bp)) { |
| 2331 | bp = dabuf->bps[i]; |
| 2332 | f = off; |
| 2333 | l = f + XFS_BUF_COUNT(bp) - 1; |
| 2334 | if (f < first) |
| 2335 | f = first; |
| 2336 | if (l > last) |
| 2337 | l = last; |
| 2338 | if (f <= l) |
| 2339 | xfs_trans_log_buf(tp, bp, f - off, l - off); |
| 2340 | /* |
| 2341 | * B_DONE is set by xfs_trans_log buf. |
| 2342 | * If we don't set it on a new buffer (get not read) |
| 2343 | * then if we don't put anything in the buffer it won't |
| 2344 | * be set, and at commit it it released into the cache, |
| 2345 | * and then a read will fail. |
| 2346 | */ |
| 2347 | else if (!(XFS_BUF_ISDONE(bp))) |
| 2348 | XFS_BUF_DONE(bp); |
| 2349 | } |
| 2350 | ASSERT(last < off); |
| 2351 | } |
| 2352 | |
| 2353 | /* |
| 2354 | * Release dabuf from a transaction. |
| 2355 | * Have to free up the dabuf before the buffers are released, |
| 2356 | * since the synchronization on the dabuf is really the lock on the buffer. |
| 2357 | */ |
| 2358 | void |
| 2359 | xfs_da_brelse(xfs_trans_t *tp, xfs_dabuf_t *dabuf) |
| 2360 | { |
| 2361 | xfs_buf_t *bp; |
| 2362 | xfs_buf_t **bplist; |
| 2363 | int i; |
| 2364 | int nbuf; |
| 2365 | |
| 2366 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); |
| 2367 | if ((nbuf = dabuf->nbuf) == 1) { |
| 2368 | bplist = &bp; |
| 2369 | bp = dabuf->bps[0]; |
| 2370 | } else { |
| 2371 | bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP); |
| 2372 | memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist)); |
| 2373 | } |
| 2374 | xfs_da_buf_done(dabuf); |
| 2375 | for (i = 0; i < nbuf; i++) |
| 2376 | xfs_trans_brelse(tp, bplist[i]); |
| 2377 | if (bplist != &bp) |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2378 | kmem_free(bplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | } |
| 2380 | |
| 2381 | /* |
| 2382 | * Invalidate dabuf from a transaction. |
| 2383 | */ |
| 2384 | void |
| 2385 | xfs_da_binval(xfs_trans_t *tp, xfs_dabuf_t *dabuf) |
| 2386 | { |
| 2387 | xfs_buf_t *bp; |
| 2388 | xfs_buf_t **bplist; |
| 2389 | int i; |
| 2390 | int nbuf; |
| 2391 | |
| 2392 | ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]); |
| 2393 | if ((nbuf = dabuf->nbuf) == 1) { |
| 2394 | bplist = &bp; |
| 2395 | bp = dabuf->bps[0]; |
| 2396 | } else { |
| 2397 | bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP); |
| 2398 | memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist)); |
| 2399 | } |
| 2400 | xfs_da_buf_done(dabuf); |
| 2401 | for (i = 0; i < nbuf; i++) |
| 2402 | xfs_trans_binval(tp, bplist[i]); |
| 2403 | if (bplist != &bp) |
Denys Vlasenko | f0e2d93 | 2008-05-19 16:31:57 +1000 | [diff] [blame] | 2404 | kmem_free(bplist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | } |
| 2406 | |
| 2407 | /* |
| 2408 | * Get the first daddr from a dabuf. |
| 2409 | */ |
| 2410 | xfs_daddr_t |
| 2411 | xfs_da_blkno(xfs_dabuf_t *dabuf) |
| 2412 | { |
| 2413 | ASSERT(dabuf->nbuf); |
| 2414 | ASSERT(dabuf->data); |
| 2415 | return XFS_BUF_ADDR(dabuf->bps[0]); |
| 2416 | } |