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) 2000-2001,2005 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" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 27 | #include "xfs_dir2.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "xfs_dmapi.h" |
| 29 | #include "xfs_mount.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "xfs_bmap_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 31 | #include "xfs_alloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_ialloc_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 33 | #include "xfs_dir2_sf.h" |
| 34 | #include "xfs_attr_sf.h" |
| 35 | #include "xfs_dinode.h" |
| 36 | #include "xfs_inode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "xfs_btree.h" |
| 38 | #include "xfs_ialloc.h" |
| 39 | #include "xfs_alloc.h" |
| 40 | #include "xfs_error.h" |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | STATIC void xfs_inobt_log_block(xfs_trans_t *, xfs_buf_t *, int); |
| 43 | STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int); |
| 44 | STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int); |
| 45 | STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | STATIC int xfs_inobt_newroot(xfs_btree_cur_t *, int *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | STATIC int xfs_inobt_split(xfs_btree_cur_t *, int, xfs_agblock_t *, |
| 48 | xfs_inobt_key_t *, xfs_btree_cur_t **, int *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | * Single level of the xfs_inobt_delete record deletion routine. |
| 52 | * Delete record pointed to by cur/level. |
| 53 | * Remove the record from its block then rebalance the tree. |
| 54 | * Return 0 for error, 1 for done, 2 to go on to the next level. |
| 55 | */ |
| 56 | STATIC int /* error */ |
| 57 | xfs_inobt_delrec( |
| 58 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 59 | int level, /* level removing record from */ |
| 60 | int *stat) /* fail/done/go-on */ |
| 61 | { |
| 62 | xfs_buf_t *agbp; /* buffer for a.g. inode header */ |
| 63 | xfs_mount_t *mp; /* mount structure */ |
| 64 | xfs_agi_t *agi; /* allocation group inode header */ |
| 65 | xfs_inobt_block_t *block; /* btree block record/key lives in */ |
| 66 | xfs_agblock_t bno; /* btree block number */ |
| 67 | xfs_buf_t *bp; /* buffer for block */ |
| 68 | int error; /* error return value */ |
| 69 | int i; /* loop index */ |
| 70 | xfs_inobt_key_t key; /* kp points here if block is level 0 */ |
| 71 | xfs_inobt_key_t *kp = NULL; /* pointer to btree keys */ |
| 72 | xfs_agblock_t lbno; /* left block's block number */ |
| 73 | xfs_buf_t *lbp; /* left block's buffer pointer */ |
| 74 | xfs_inobt_block_t *left; /* left btree block */ |
| 75 | xfs_inobt_key_t *lkp; /* left block key pointer */ |
| 76 | xfs_inobt_ptr_t *lpp; /* left block address pointer */ |
| 77 | int lrecs = 0; /* number of records in left block */ |
| 78 | xfs_inobt_rec_t *lrp; /* left block record pointer */ |
| 79 | xfs_inobt_ptr_t *pp = NULL; /* pointer to btree addresses */ |
| 80 | int ptr; /* index in btree block for this rec */ |
| 81 | xfs_agblock_t rbno; /* right block's block number */ |
| 82 | xfs_buf_t *rbp; /* right block's buffer pointer */ |
| 83 | xfs_inobt_block_t *right; /* right btree block */ |
| 84 | xfs_inobt_key_t *rkp; /* right block key pointer */ |
| 85 | xfs_inobt_rec_t *rp; /* pointer to btree records */ |
| 86 | xfs_inobt_ptr_t *rpp; /* right block address pointer */ |
| 87 | int rrecs = 0; /* number of records in right block */ |
| 88 | int numrecs; |
| 89 | xfs_inobt_rec_t *rrp; /* right block record pointer */ |
| 90 | xfs_btree_cur_t *tcur; /* temporary btree cursor */ |
| 91 | |
| 92 | mp = cur->bc_mp; |
| 93 | |
| 94 | /* |
| 95 | * Get the index of the entry being deleted, check for nothing there. |
| 96 | */ |
| 97 | ptr = cur->bc_ptrs[level]; |
| 98 | if (ptr == 0) { |
| 99 | *stat = 0; |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Get the buffer & block containing the record or key/ptr. |
| 105 | */ |
| 106 | bp = cur->bc_bufs[level]; |
| 107 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 108 | #ifdef DEBUG |
| 109 | if ((error = xfs_btree_check_sblock(cur, block, level, bp))) |
| 110 | return error; |
| 111 | #endif |
| 112 | /* |
| 113 | * Fail if we're off the end of the block. |
| 114 | */ |
| 115 | |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 116 | numrecs = be16_to_cpu(block->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | if (ptr > numrecs) { |
| 118 | *stat = 0; |
| 119 | return 0; |
| 120 | } |
| 121 | /* |
| 122 | * It's a nonleaf. Excise the key and ptr being deleted, by |
| 123 | * sliding the entries past them down one. |
| 124 | * Log the changed areas of the block. |
| 125 | */ |
| 126 | if (level > 0) { |
| 127 | kp = XFS_INOBT_KEY_ADDR(block, 1, cur); |
| 128 | pp = XFS_INOBT_PTR_ADDR(block, 1, cur); |
| 129 | #ifdef DEBUG |
| 130 | for (i = ptr; i < numrecs; i++) { |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 131 | if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i]), level))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | return error; |
| 133 | } |
| 134 | #endif |
| 135 | if (ptr < numrecs) { |
| 136 | memmove(&kp[ptr - 1], &kp[ptr], |
| 137 | (numrecs - ptr) * sizeof(*kp)); |
| 138 | memmove(&pp[ptr - 1], &pp[ptr], |
| 139 | (numrecs - ptr) * sizeof(*kp)); |
| 140 | xfs_inobt_log_keys(cur, bp, ptr, numrecs - 1); |
| 141 | xfs_inobt_log_ptrs(cur, bp, ptr, numrecs - 1); |
| 142 | } |
| 143 | } |
| 144 | /* |
| 145 | * It's a leaf. Excise the record being deleted, by sliding the |
| 146 | * entries past it down one. Log the changed areas of the block. |
| 147 | */ |
| 148 | else { |
| 149 | rp = XFS_INOBT_REC_ADDR(block, 1, cur); |
| 150 | if (ptr < numrecs) { |
| 151 | memmove(&rp[ptr - 1], &rp[ptr], |
| 152 | (numrecs - ptr) * sizeof(*rp)); |
| 153 | xfs_inobt_log_recs(cur, bp, ptr, numrecs - 1); |
| 154 | } |
| 155 | /* |
| 156 | * If it's the first record in the block, we'll need a key |
| 157 | * structure to pass up to the next level (updkey). |
| 158 | */ |
| 159 | if (ptr == 1) { |
| 160 | key.ir_startino = rp->ir_startino; |
| 161 | kp = &key; |
| 162 | } |
| 163 | } |
| 164 | /* |
| 165 | * Decrement and log the number of entries in the block. |
| 166 | */ |
| 167 | numrecs--; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 168 | block->bb_numrecs = cpu_to_be16(numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS); |
| 170 | /* |
| 171 | * Is this the root level? If so, we're almost done. |
| 172 | */ |
| 173 | if (level == cur->bc_nlevels - 1) { |
| 174 | /* |
| 175 | * If this is the root level, |
| 176 | * and there's only one entry left, |
| 177 | * and it's NOT the leaf level, |
| 178 | * then we can get rid of this level. |
| 179 | */ |
| 180 | if (numrecs == 1 && level > 0) { |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 181 | agbp = cur->bc_private.a.agbp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | agi = XFS_BUF_TO_AGI(agbp); |
| 183 | /* |
| 184 | * pp is still set to the first pointer in the block. |
| 185 | * Make it the new root of the btree. |
| 186 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 187 | bno = be32_to_cpu(agi->agi_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | agi->agi_root = *pp; |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 189 | be32_add_cpu(&agi->agi_level, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /* |
| 191 | * Free the block. |
| 192 | */ |
| 193 | if ((error = xfs_free_extent(cur->bc_tp, |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 194 | XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, bno), 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | return error; |
| 196 | xfs_trans_binval(cur->bc_tp, bp); |
| 197 | xfs_ialloc_log_agi(cur->bc_tp, agbp, |
| 198 | XFS_AGI_ROOT | XFS_AGI_LEVEL); |
| 199 | /* |
| 200 | * Update the cursor so there's one fewer level. |
| 201 | */ |
| 202 | cur->bc_bufs[level] = NULL; |
| 203 | cur->bc_nlevels--; |
| 204 | } else if (level > 0 && |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 205 | (error = xfs_btree_decrement(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | return error; |
| 207 | *stat = 1; |
| 208 | return 0; |
| 209 | } |
| 210 | /* |
| 211 | * If we deleted the leftmost entry in the block, update the |
| 212 | * key values above us in the tree. |
| 213 | */ |
Christoph Hellwig | 38bb742 | 2008-10-30 16:56:22 +1100 | [diff] [blame] | 214 | if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | return error; |
| 216 | /* |
| 217 | * If the number of records remaining in the block is at least |
| 218 | * the minimum, we're done. |
| 219 | */ |
| 220 | if (numrecs >= XFS_INOBT_BLOCK_MINRECS(level, cur)) { |
| 221 | if (level > 0 && |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 222 | (error = xfs_btree_decrement(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | return error; |
| 224 | *stat = 1; |
| 225 | return 0; |
| 226 | } |
| 227 | /* |
| 228 | * Otherwise, we have to move some records around to keep the |
| 229 | * tree balanced. Look at the left and right sibling blocks to |
| 230 | * see if we can re-balance by moving only one record. |
| 231 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 232 | rbno = be32_to_cpu(block->bb_rightsib); |
| 233 | lbno = be32_to_cpu(block->bb_leftsib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | bno = NULLAGBLOCK; |
| 235 | ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK); |
| 236 | /* |
| 237 | * Duplicate the cursor so our btree manipulations here won't |
| 238 | * disrupt the next level up. |
| 239 | */ |
| 240 | if ((error = xfs_btree_dup_cursor(cur, &tcur))) |
| 241 | return error; |
| 242 | /* |
| 243 | * If there's a right sibling, see if it's ok to shift an entry |
| 244 | * out of it. |
| 245 | */ |
| 246 | if (rbno != NULLAGBLOCK) { |
| 247 | /* |
| 248 | * Move the temp cursor to the last entry in the next block. |
| 249 | * Actually any entry but the first would suffice. |
| 250 | */ |
| 251 | i = xfs_btree_lastrec(tcur, level); |
| 252 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
Christoph Hellwig | 637aa50 | 2008-10-30 16:55:45 +1100 | [diff] [blame] | 253 | if ((error = xfs_btree_increment(tcur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | goto error0; |
| 255 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| 256 | i = xfs_btree_lastrec(tcur, level); |
| 257 | XFS_WANT_CORRUPTED_GOTO(i == 1, error0); |
| 258 | /* |
| 259 | * Grab a pointer to the block. |
| 260 | */ |
| 261 | rbp = tcur->bc_bufs[level]; |
| 262 | right = XFS_BUF_TO_INOBT_BLOCK(rbp); |
| 263 | #ifdef DEBUG |
| 264 | if ((error = xfs_btree_check_sblock(cur, right, level, rbp))) |
| 265 | goto error0; |
| 266 | #endif |
| 267 | /* |
| 268 | * Grab the current block number, for future use. |
| 269 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 270 | bno = be32_to_cpu(right->bb_leftsib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | /* |
| 272 | * If right block is full enough so that removing one entry |
| 273 | * won't make it too empty, and left-shifting an entry out |
| 274 | * of right to us works, we're done. |
| 275 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 276 | if (be16_to_cpu(right->bb_numrecs) - 1 >= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | XFS_INOBT_BLOCK_MINRECS(level, cur)) { |
Christoph Hellwig | 687b890 | 2008-10-30 16:56:53 +1100 | [diff] [blame^] | 278 | if ((error = xfs_btree_lshift(tcur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | goto error0; |
| 280 | if (i) { |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 281 | ASSERT(be16_to_cpu(block->bb_numrecs) >= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | XFS_INOBT_BLOCK_MINRECS(level, cur)); |
| 283 | xfs_btree_del_cursor(tcur, |
| 284 | XFS_BTREE_NOERROR); |
| 285 | if (level > 0 && |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 286 | (error = xfs_btree_decrement(cur, level, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | &i))) |
| 288 | return error; |
| 289 | *stat = 1; |
| 290 | return 0; |
| 291 | } |
| 292 | } |
| 293 | /* |
| 294 | * Otherwise, grab the number of records in right for |
| 295 | * future reference, and fix up the temp cursor to point |
| 296 | * to our block again (last record). |
| 297 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 298 | rrecs = be16_to_cpu(right->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | if (lbno != NULLAGBLOCK) { |
| 300 | xfs_btree_firstrec(tcur, level); |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 301 | if ((error = xfs_btree_decrement(tcur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | goto error0; |
| 303 | } |
| 304 | } |
| 305 | /* |
| 306 | * If there's a left sibling, see if it's ok to shift an entry |
| 307 | * out of it. |
| 308 | */ |
| 309 | if (lbno != NULLAGBLOCK) { |
| 310 | /* |
| 311 | * Move the temp cursor to the first entry in the |
| 312 | * previous block. |
| 313 | */ |
| 314 | xfs_btree_firstrec(tcur, level); |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 315 | if ((error = xfs_btree_decrement(tcur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | goto error0; |
| 317 | xfs_btree_firstrec(tcur, level); |
| 318 | /* |
| 319 | * Grab a pointer to the block. |
| 320 | */ |
| 321 | lbp = tcur->bc_bufs[level]; |
| 322 | left = XFS_BUF_TO_INOBT_BLOCK(lbp); |
| 323 | #ifdef DEBUG |
| 324 | if ((error = xfs_btree_check_sblock(cur, left, level, lbp))) |
| 325 | goto error0; |
| 326 | #endif |
| 327 | /* |
| 328 | * Grab the current block number, for future use. |
| 329 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 330 | bno = be32_to_cpu(left->bb_rightsib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | /* |
| 332 | * If left block is full enough so that removing one entry |
| 333 | * won't make it too empty, and right-shifting an entry out |
| 334 | * of left to us works, we're done. |
| 335 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 336 | if (be16_to_cpu(left->bb_numrecs) - 1 >= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | XFS_INOBT_BLOCK_MINRECS(level, cur)) { |
Christoph Hellwig | 9eaead5 | 2008-10-30 16:56:43 +1100 | [diff] [blame] | 338 | if ((error = xfs_btree_rshift(tcur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | goto error0; |
| 340 | if (i) { |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 341 | ASSERT(be16_to_cpu(block->bb_numrecs) >= |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | XFS_INOBT_BLOCK_MINRECS(level, cur)); |
| 343 | xfs_btree_del_cursor(tcur, |
| 344 | XFS_BTREE_NOERROR); |
| 345 | if (level == 0) |
| 346 | cur->bc_ptrs[0]++; |
| 347 | *stat = 1; |
| 348 | return 0; |
| 349 | } |
| 350 | } |
| 351 | /* |
| 352 | * Otherwise, grab the number of records in right for |
| 353 | * future reference. |
| 354 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 355 | lrecs = be16_to_cpu(left->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | /* |
| 358 | * Delete the temp cursor, we're done with it. |
| 359 | */ |
| 360 | xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR); |
| 361 | /* |
| 362 | * If here, we need to do a join to keep the tree balanced. |
| 363 | */ |
| 364 | ASSERT(bno != NULLAGBLOCK); |
| 365 | /* |
| 366 | * See if we can join with the left neighbor block. |
| 367 | */ |
| 368 | if (lbno != NULLAGBLOCK && |
| 369 | lrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) { |
| 370 | /* |
| 371 | * Set "right" to be the starting block, |
| 372 | * "left" to be the left neighbor. |
| 373 | */ |
| 374 | rbno = bno; |
| 375 | right = block; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 376 | rrecs = be16_to_cpu(right->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | rbp = bp; |
| 378 | if ((error = xfs_btree_read_bufs(mp, cur->bc_tp, |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 379 | cur->bc_private.a.agno, lbno, 0, &lbp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | XFS_INO_BTREE_REF))) |
| 381 | return error; |
| 382 | left = XFS_BUF_TO_INOBT_BLOCK(lbp); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 383 | lrecs = be16_to_cpu(left->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | if ((error = xfs_btree_check_sblock(cur, left, level, lbp))) |
| 385 | return error; |
| 386 | } |
| 387 | /* |
| 388 | * If that won't work, see if we can join with the right neighbor block. |
| 389 | */ |
| 390 | else if (rbno != NULLAGBLOCK && |
| 391 | rrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) { |
| 392 | /* |
| 393 | * Set "left" to be the starting block, |
| 394 | * "right" to be the right neighbor. |
| 395 | */ |
| 396 | lbno = bno; |
| 397 | left = block; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 398 | lrecs = be16_to_cpu(left->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | lbp = bp; |
| 400 | if ((error = xfs_btree_read_bufs(mp, cur->bc_tp, |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 401 | cur->bc_private.a.agno, rbno, 0, &rbp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | XFS_INO_BTREE_REF))) |
| 403 | return error; |
| 404 | right = XFS_BUF_TO_INOBT_BLOCK(rbp); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 405 | rrecs = be16_to_cpu(right->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if ((error = xfs_btree_check_sblock(cur, right, level, rbp))) |
| 407 | return error; |
| 408 | } |
| 409 | /* |
| 410 | * Otherwise, we can't fix the imbalance. |
| 411 | * Just return. This is probably a logic error, but it's not fatal. |
| 412 | */ |
| 413 | else { |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 414 | if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | return error; |
| 416 | *stat = 1; |
| 417 | return 0; |
| 418 | } |
| 419 | /* |
| 420 | * We're now going to join "left" and "right" by moving all the stuff |
| 421 | * in "right" to "left" and deleting "right". |
| 422 | */ |
| 423 | if (level > 0) { |
| 424 | /* |
| 425 | * It's a non-leaf. Move keys and pointers. |
| 426 | */ |
| 427 | lkp = XFS_INOBT_KEY_ADDR(left, lrecs + 1, cur); |
| 428 | lpp = XFS_INOBT_PTR_ADDR(left, lrecs + 1, cur); |
| 429 | rkp = XFS_INOBT_KEY_ADDR(right, 1, cur); |
| 430 | rpp = XFS_INOBT_PTR_ADDR(right, 1, cur); |
| 431 | #ifdef DEBUG |
| 432 | for (i = 0; i < rrecs; i++) { |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 433 | if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | return error; |
| 435 | } |
| 436 | #endif |
| 437 | memcpy(lkp, rkp, rrecs * sizeof(*lkp)); |
| 438 | memcpy(lpp, rpp, rrecs * sizeof(*lpp)); |
| 439 | xfs_inobt_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs); |
| 440 | xfs_inobt_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs); |
| 441 | } else { |
| 442 | /* |
| 443 | * It's a leaf. Move records. |
| 444 | */ |
| 445 | lrp = XFS_INOBT_REC_ADDR(left, lrecs + 1, cur); |
| 446 | rrp = XFS_INOBT_REC_ADDR(right, 1, cur); |
| 447 | memcpy(lrp, rrp, rrecs * sizeof(*lrp)); |
| 448 | xfs_inobt_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs); |
| 449 | } |
| 450 | /* |
| 451 | * If we joined with the left neighbor, set the buffer in the |
| 452 | * cursor to the left block, and fix up the index. |
| 453 | */ |
| 454 | if (bp != lbp) { |
| 455 | xfs_btree_setbuf(cur, level, lbp); |
| 456 | cur->bc_ptrs[level] += lrecs; |
| 457 | } |
| 458 | /* |
| 459 | * If we joined with the right neighbor and there's a level above |
| 460 | * us, increment the cursor at that level. |
| 461 | */ |
| 462 | else if (level + 1 < cur->bc_nlevels && |
Christoph Hellwig | 637aa50 | 2008-10-30 16:55:45 +1100 | [diff] [blame] | 463 | (error = xfs_btree_increment(cur, level + 1, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | return error; |
| 465 | /* |
| 466 | * Fix up the number of records in the surviving block. |
| 467 | */ |
| 468 | lrecs += rrecs; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 469 | left->bb_numrecs = cpu_to_be16(lrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | /* |
| 471 | * Fix up the right block pointer in the surviving block, and log it. |
| 472 | */ |
| 473 | left->bb_rightsib = right->bb_rightsib; |
| 474 | xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB); |
| 475 | /* |
| 476 | * If there is a right sibling now, make it point to the |
| 477 | * remaining block. |
| 478 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 479 | if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | xfs_inobt_block_t *rrblock; |
| 481 | xfs_buf_t *rrbp; |
| 482 | |
| 483 | if ((error = xfs_btree_read_bufs(mp, cur->bc_tp, |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 484 | cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | &rrbp, XFS_INO_BTREE_REF))) |
| 486 | return error; |
| 487 | rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp); |
| 488 | if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp))) |
| 489 | return error; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 490 | rrblock->bb_leftsib = cpu_to_be32(lbno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | xfs_inobt_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB); |
| 492 | } |
| 493 | /* |
| 494 | * Free the deleting block. |
| 495 | */ |
| 496 | if ((error = xfs_free_extent(cur->bc_tp, XFS_AGB_TO_FSB(mp, |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 497 | cur->bc_private.a.agno, rbno), 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | return error; |
| 499 | xfs_trans_binval(cur->bc_tp, rbp); |
| 500 | /* |
| 501 | * Readjust the ptr at this level if it's not a leaf, since it's |
| 502 | * still pointing at the deletion point, which makes the cursor |
| 503 | * inconsistent. If this makes the ptr 0, the caller fixes it up. |
| 504 | * We can't use decrement because it would change the next level up. |
| 505 | */ |
| 506 | if (level > 0) |
| 507 | cur->bc_ptrs[level]--; |
| 508 | /* |
| 509 | * Return value means the next level up has something to do. |
| 510 | */ |
| 511 | *stat = 2; |
| 512 | return 0; |
| 513 | |
| 514 | error0: |
| 515 | xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR); |
| 516 | return error; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Insert one record/level. Return information to the caller |
| 521 | * allowing the next level up to proceed if necessary. |
| 522 | */ |
| 523 | STATIC int /* error */ |
| 524 | xfs_inobt_insrec( |
| 525 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 526 | int level, /* level to insert record at */ |
| 527 | xfs_agblock_t *bnop, /* i/o: block number inserted */ |
| 528 | xfs_inobt_rec_t *recp, /* i/o: record data inserted */ |
| 529 | xfs_btree_cur_t **curp, /* output: new cursor replacing cur */ |
| 530 | int *stat) /* success/failure */ |
| 531 | { |
| 532 | xfs_inobt_block_t *block; /* btree block record/key lives in */ |
| 533 | xfs_buf_t *bp; /* buffer for block */ |
| 534 | int error; /* error return value */ |
| 535 | int i; /* loop index */ |
| 536 | xfs_inobt_key_t key; /* key value being inserted */ |
| 537 | xfs_inobt_key_t *kp=NULL; /* pointer to btree keys */ |
| 538 | xfs_agblock_t nbno; /* block number of allocated block */ |
| 539 | xfs_btree_cur_t *ncur; /* new cursor to be used at next lvl */ |
| 540 | xfs_inobt_key_t nkey; /* new key value, from split */ |
| 541 | xfs_inobt_rec_t nrec; /* new record value, for caller */ |
| 542 | int numrecs; |
| 543 | int optr; /* old ptr value */ |
| 544 | xfs_inobt_ptr_t *pp; /* pointer to btree addresses */ |
| 545 | int ptr; /* index in btree block for this rec */ |
| 546 | xfs_inobt_rec_t *rp=NULL; /* pointer to btree records */ |
| 547 | |
| 548 | /* |
Christoph Hellwig | 5bde1ba | 2005-11-02 15:06:18 +1100 | [diff] [blame] | 549 | * GCC doesn't understand the (arguably complex) control flow in |
| 550 | * this function and complains about uninitialized structure fields |
| 551 | * without this. |
| 552 | */ |
| 553 | memset(&nrec, 0, sizeof(nrec)); |
| 554 | |
| 555 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | * If we made it to the root level, allocate a new root block |
| 557 | * and we're done. |
| 558 | */ |
| 559 | if (level >= cur->bc_nlevels) { |
| 560 | error = xfs_inobt_newroot(cur, &i); |
| 561 | *bnop = NULLAGBLOCK; |
| 562 | *stat = i; |
| 563 | return error; |
| 564 | } |
| 565 | /* |
| 566 | * Make a key out of the record data to be inserted, and save it. |
| 567 | */ |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 568 | key.ir_startino = recp->ir_startino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | optr = ptr = cur->bc_ptrs[level]; |
| 570 | /* |
| 571 | * If we're off the left edge, return failure. |
| 572 | */ |
| 573 | if (ptr == 0) { |
| 574 | *stat = 0; |
| 575 | return 0; |
| 576 | } |
| 577 | /* |
| 578 | * Get pointers to the btree buffer and block. |
| 579 | */ |
| 580 | bp = cur->bc_bufs[level]; |
| 581 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 582 | numrecs = be16_to_cpu(block->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | #ifdef DEBUG |
| 584 | if ((error = xfs_btree_check_sblock(cur, block, level, bp))) |
| 585 | return error; |
| 586 | /* |
| 587 | * Check that the new entry is being inserted in the right place. |
| 588 | */ |
| 589 | if (ptr <= numrecs) { |
| 590 | if (level == 0) { |
| 591 | rp = XFS_INOBT_REC_ADDR(block, ptr, cur); |
| 592 | xfs_btree_check_rec(cur->bc_btnum, recp, rp); |
| 593 | } else { |
| 594 | kp = XFS_INOBT_KEY_ADDR(block, ptr, cur); |
| 595 | xfs_btree_check_key(cur->bc_btnum, &key, kp); |
| 596 | } |
| 597 | } |
| 598 | #endif |
| 599 | nbno = NULLAGBLOCK; |
Nathan Scott | 1121b21 | 2006-09-28 10:58:40 +1000 | [diff] [blame] | 600 | ncur = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | /* |
| 602 | * If the block is full, we can't insert the new entry until we |
| 603 | * make the block un-full. |
| 604 | */ |
| 605 | if (numrecs == XFS_INOBT_BLOCK_MAXRECS(level, cur)) { |
| 606 | /* |
| 607 | * First, try shifting an entry to the right neighbor. |
| 608 | */ |
Christoph Hellwig | 9eaead5 | 2008-10-30 16:56:43 +1100 | [diff] [blame] | 609 | if ((error = xfs_btree_rshift(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return error; |
| 611 | if (i) { |
| 612 | /* nothing */ |
| 613 | } |
| 614 | /* |
| 615 | * Next, try shifting an entry to the left neighbor. |
| 616 | */ |
| 617 | else { |
Christoph Hellwig | 687b890 | 2008-10-30 16:56:53 +1100 | [diff] [blame^] | 618 | if ((error = xfs_btree_lshift(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return error; |
| 620 | if (i) { |
| 621 | optr = ptr = cur->bc_ptrs[level]; |
| 622 | } else { |
| 623 | /* |
| 624 | * Next, try splitting the current block |
| 625 | * in half. If this works we have to |
| 626 | * re-set our variables because |
| 627 | * we could be in a different block now. |
| 628 | */ |
| 629 | if ((error = xfs_inobt_split(cur, level, &nbno, |
| 630 | &nkey, &ncur, &i))) |
| 631 | return error; |
| 632 | if (i) { |
| 633 | bp = cur->bc_bufs[level]; |
| 634 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 635 | #ifdef DEBUG |
| 636 | if ((error = xfs_btree_check_sblock(cur, |
| 637 | block, level, bp))) |
| 638 | return error; |
| 639 | #endif |
| 640 | ptr = cur->bc_ptrs[level]; |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 641 | nrec.ir_startino = nkey.ir_startino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | } else { |
| 643 | /* |
| 644 | * Otherwise the insert fails. |
| 645 | */ |
| 646 | *stat = 0; |
| 647 | return 0; |
| 648 | } |
| 649 | } |
| 650 | } |
| 651 | } |
| 652 | /* |
| 653 | * At this point we know there's room for our new entry in the block |
| 654 | * we're pointing at. |
| 655 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 656 | numrecs = be16_to_cpu(block->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | if (level > 0) { |
| 658 | /* |
| 659 | * It's a non-leaf entry. Make a hole for the new data |
| 660 | * in the key and ptr regions of the block. |
| 661 | */ |
| 662 | kp = XFS_INOBT_KEY_ADDR(block, 1, cur); |
| 663 | pp = XFS_INOBT_PTR_ADDR(block, 1, cur); |
| 664 | #ifdef DEBUG |
| 665 | for (i = numrecs; i >= ptr; i--) { |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 666 | if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i - 1]), level))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return error; |
| 668 | } |
| 669 | #endif |
| 670 | memmove(&kp[ptr], &kp[ptr - 1], |
| 671 | (numrecs - ptr + 1) * sizeof(*kp)); |
| 672 | memmove(&pp[ptr], &pp[ptr - 1], |
| 673 | (numrecs - ptr + 1) * sizeof(*pp)); |
| 674 | /* |
| 675 | * Now stuff the new data in, bump numrecs and log the new data. |
| 676 | */ |
| 677 | #ifdef DEBUG |
| 678 | if ((error = xfs_btree_check_sptr(cur, *bnop, level))) |
| 679 | return error; |
| 680 | #endif |
Christoph Hellwig | c38e5e8 | 2006-09-28 10:57:17 +1000 | [diff] [blame] | 681 | kp[ptr - 1] = key; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 682 | pp[ptr - 1] = cpu_to_be32(*bnop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | numrecs++; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 684 | block->bb_numrecs = cpu_to_be16(numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | xfs_inobt_log_keys(cur, bp, ptr, numrecs); |
| 686 | xfs_inobt_log_ptrs(cur, bp, ptr, numrecs); |
| 687 | } else { |
| 688 | /* |
| 689 | * It's a leaf entry. Make a hole for the new record. |
| 690 | */ |
| 691 | rp = XFS_INOBT_REC_ADDR(block, 1, cur); |
| 692 | memmove(&rp[ptr], &rp[ptr - 1], |
| 693 | (numrecs - ptr + 1) * sizeof(*rp)); |
| 694 | /* |
| 695 | * Now stuff the new record in, bump numrecs |
| 696 | * and log the new data. |
| 697 | */ |
Christoph Hellwig | c38e5e8 | 2006-09-28 10:57:17 +1000 | [diff] [blame] | 698 | rp[ptr - 1] = *recp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | numrecs++; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 700 | block->bb_numrecs = cpu_to_be16(numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | xfs_inobt_log_recs(cur, bp, ptr, numrecs); |
| 702 | } |
| 703 | /* |
| 704 | * Log the new number of records in the btree header. |
| 705 | */ |
| 706 | xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS); |
| 707 | #ifdef DEBUG |
| 708 | /* |
| 709 | * Check that the key/record is in the right place, now. |
| 710 | */ |
| 711 | if (ptr < numrecs) { |
| 712 | if (level == 0) |
| 713 | xfs_btree_check_rec(cur->bc_btnum, rp + ptr - 1, |
| 714 | rp + ptr); |
| 715 | else |
| 716 | xfs_btree_check_key(cur->bc_btnum, kp + ptr - 1, |
| 717 | kp + ptr); |
| 718 | } |
| 719 | #endif |
| 720 | /* |
| 721 | * If we inserted at the start of a block, update the parents' keys. |
| 722 | */ |
Christoph Hellwig | 38bb742 | 2008-10-30 16:56:22 +1100 | [diff] [blame] | 723 | if (optr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)&key, level + 1))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return error; |
| 725 | /* |
| 726 | * Return the new block number, if any. |
| 727 | * If there is one, give back a record value and a cursor too. |
| 728 | */ |
| 729 | *bnop = nbno; |
| 730 | if (nbno != NULLAGBLOCK) { |
Christoph Hellwig | c38e5e8 | 2006-09-28 10:57:17 +1000 | [diff] [blame] | 731 | *recp = nrec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | *curp = ncur; |
| 733 | } |
| 734 | *stat = 1; |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Log header fields from a btree block. |
| 740 | */ |
| 741 | STATIC void |
| 742 | xfs_inobt_log_block( |
| 743 | xfs_trans_t *tp, /* transaction pointer */ |
| 744 | xfs_buf_t *bp, /* buffer containing btree block */ |
| 745 | int fields) /* mask of fields: XFS_BB_... */ |
| 746 | { |
| 747 | int first; /* first byte offset logged */ |
| 748 | int last; /* last byte offset logged */ |
| 749 | static const short offsets[] = { /* table of offsets */ |
| 750 | offsetof(xfs_inobt_block_t, bb_magic), |
| 751 | offsetof(xfs_inobt_block_t, bb_level), |
| 752 | offsetof(xfs_inobt_block_t, bb_numrecs), |
| 753 | offsetof(xfs_inobt_block_t, bb_leftsib), |
| 754 | offsetof(xfs_inobt_block_t, bb_rightsib), |
| 755 | sizeof(xfs_inobt_block_t) |
| 756 | }; |
| 757 | |
| 758 | xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last); |
| 759 | xfs_trans_log_buf(tp, bp, first, last); |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * Log keys from a btree block (nonleaf). |
| 764 | */ |
| 765 | STATIC void |
| 766 | xfs_inobt_log_keys( |
| 767 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 768 | xfs_buf_t *bp, /* buffer containing btree block */ |
| 769 | int kfirst, /* index of first key to log */ |
| 770 | int klast) /* index of last key to log */ |
| 771 | { |
| 772 | xfs_inobt_block_t *block; /* btree block to log from */ |
| 773 | int first; /* first byte offset logged */ |
| 774 | xfs_inobt_key_t *kp; /* key pointer in btree block */ |
| 775 | int last; /* last byte offset logged */ |
| 776 | |
| 777 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 778 | kp = XFS_INOBT_KEY_ADDR(block, 1, cur); |
| 779 | first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block); |
| 780 | last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block); |
| 781 | xfs_trans_log_buf(cur->bc_tp, bp, first, last); |
| 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Log block pointer fields from a btree block (nonleaf). |
| 786 | */ |
| 787 | STATIC void |
| 788 | xfs_inobt_log_ptrs( |
| 789 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 790 | xfs_buf_t *bp, /* buffer containing btree block */ |
| 791 | int pfirst, /* index of first pointer to log */ |
| 792 | int plast) /* index of last pointer to log */ |
| 793 | { |
| 794 | xfs_inobt_block_t *block; /* btree block to log from */ |
| 795 | int first; /* first byte offset logged */ |
| 796 | int last; /* last byte offset logged */ |
| 797 | xfs_inobt_ptr_t *pp; /* block-pointer pointer in btree blk */ |
| 798 | |
| 799 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 800 | pp = XFS_INOBT_PTR_ADDR(block, 1, cur); |
| 801 | first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block); |
| 802 | last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block); |
| 803 | xfs_trans_log_buf(cur->bc_tp, bp, first, last); |
| 804 | } |
| 805 | |
| 806 | /* |
| 807 | * Log records from a btree block (leaf). |
| 808 | */ |
| 809 | STATIC void |
| 810 | xfs_inobt_log_recs( |
| 811 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 812 | xfs_buf_t *bp, /* buffer containing btree block */ |
| 813 | int rfirst, /* index of first record to log */ |
| 814 | int rlast) /* index of last record to log */ |
| 815 | { |
| 816 | xfs_inobt_block_t *block; /* btree block to log from */ |
| 817 | int first; /* first byte offset logged */ |
| 818 | int last; /* last byte offset logged */ |
| 819 | xfs_inobt_rec_t *rp; /* record pointer for btree block */ |
| 820 | |
| 821 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 822 | rp = XFS_INOBT_REC_ADDR(block, 1, cur); |
| 823 | first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block); |
| 824 | last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block); |
| 825 | xfs_trans_log_buf(cur->bc_tp, bp, first, last); |
| 826 | } |
| 827 | |
| 828 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | * Allocate a new root block, fill it in. |
| 830 | */ |
| 831 | STATIC int /* error */ |
| 832 | xfs_inobt_newroot( |
| 833 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 834 | int *stat) /* success/failure */ |
| 835 | { |
| 836 | xfs_agi_t *agi; /* a.g. inode header */ |
| 837 | xfs_alloc_arg_t args; /* allocation argument structure */ |
| 838 | xfs_inobt_block_t *block; /* one half of the old root block */ |
| 839 | xfs_buf_t *bp; /* buffer containing block */ |
| 840 | int error; /* error return value */ |
| 841 | xfs_inobt_key_t *kp; /* btree key pointer */ |
| 842 | xfs_agblock_t lbno; /* left block number */ |
| 843 | xfs_buf_t *lbp; /* left buffer pointer */ |
| 844 | xfs_inobt_block_t *left; /* left btree block */ |
| 845 | xfs_buf_t *nbp; /* new (root) buffer */ |
| 846 | xfs_inobt_block_t *new; /* new (root) btree block */ |
| 847 | int nptr; /* new value for key index, 1 or 2 */ |
| 848 | xfs_inobt_ptr_t *pp; /* btree address pointer */ |
| 849 | xfs_agblock_t rbno; /* right block number */ |
| 850 | xfs_buf_t *rbp; /* right buffer pointer */ |
| 851 | xfs_inobt_block_t *right; /* right btree block */ |
| 852 | xfs_inobt_rec_t *rp; /* btree record pointer */ |
| 853 | |
| 854 | ASSERT(cur->bc_nlevels < XFS_IN_MAXLEVELS(cur->bc_mp)); |
| 855 | |
| 856 | /* |
| 857 | * Get a block & a buffer. |
| 858 | */ |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 859 | agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | args.tp = cur->bc_tp; |
| 861 | args.mp = cur->bc_mp; |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 862 | args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 863 | be32_to_cpu(agi->agi_root)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | args.mod = args.minleft = args.alignment = args.total = args.wasdel = |
| 865 | args.isfl = args.userdata = args.minalignslop = 0; |
| 866 | args.minlen = args.maxlen = args.prod = 1; |
| 867 | args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| 868 | if ((error = xfs_alloc_vextent(&args))) |
| 869 | return error; |
| 870 | /* |
| 871 | * None available, we fail. |
| 872 | */ |
| 873 | if (args.fsbno == NULLFSBLOCK) { |
| 874 | *stat = 0; |
| 875 | return 0; |
| 876 | } |
| 877 | ASSERT(args.len == 1); |
| 878 | nbp = xfs_btree_get_bufs(args.mp, args.tp, args.agno, args.agbno, 0); |
| 879 | new = XFS_BUF_TO_INOBT_BLOCK(nbp); |
| 880 | /* |
| 881 | * Set the root data in the a.g. inode structure. |
| 882 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 883 | agi->agi_root = cpu_to_be32(args.agbno); |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 884 | be32_add_cpu(&agi->agi_level, 1); |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 885 | xfs_ialloc_log_agi(args.tp, cur->bc_private.a.agbp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | XFS_AGI_ROOT | XFS_AGI_LEVEL); |
| 887 | /* |
| 888 | * At the previous root level there are now two blocks: the old |
| 889 | * root, and the new block generated when it was split. |
| 890 | * We don't know which one the cursor is pointing at, so we |
| 891 | * set up variables "left" and "right" for each case. |
| 892 | */ |
| 893 | bp = cur->bc_bufs[cur->bc_nlevels - 1]; |
| 894 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 895 | #ifdef DEBUG |
| 896 | if ((error = xfs_btree_check_sblock(cur, block, cur->bc_nlevels - 1, bp))) |
| 897 | return error; |
| 898 | #endif |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 899 | if (be32_to_cpu(block->bb_rightsib) != NULLAGBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | /* |
| 901 | * Our block is left, pick up the right block. |
| 902 | */ |
| 903 | lbp = bp; |
| 904 | lbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(lbp)); |
| 905 | left = block; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 906 | rbno = be32_to_cpu(left->bb_rightsib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno, |
| 908 | rbno, 0, &rbp, XFS_INO_BTREE_REF))) |
| 909 | return error; |
| 910 | bp = rbp; |
| 911 | right = XFS_BUF_TO_INOBT_BLOCK(rbp); |
| 912 | if ((error = xfs_btree_check_sblock(cur, right, |
| 913 | cur->bc_nlevels - 1, rbp))) |
| 914 | return error; |
| 915 | nptr = 1; |
| 916 | } else { |
| 917 | /* |
| 918 | * Our block is right, pick up the left block. |
| 919 | */ |
| 920 | rbp = bp; |
| 921 | rbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(rbp)); |
| 922 | right = block; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 923 | lbno = be32_to_cpu(right->bb_leftsib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno, |
| 925 | lbno, 0, &lbp, XFS_INO_BTREE_REF))) |
| 926 | return error; |
| 927 | bp = lbp; |
| 928 | left = XFS_BUF_TO_INOBT_BLOCK(lbp); |
| 929 | if ((error = xfs_btree_check_sblock(cur, left, |
| 930 | cur->bc_nlevels - 1, lbp))) |
| 931 | return error; |
| 932 | nptr = 2; |
| 933 | } |
| 934 | /* |
| 935 | * Fill in the new block's btree header and log it. |
| 936 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 937 | new->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]); |
| 938 | new->bb_level = cpu_to_be16(cur->bc_nlevels); |
| 939 | new->bb_numrecs = cpu_to_be16(2); |
| 940 | new->bb_leftsib = cpu_to_be32(NULLAGBLOCK); |
| 941 | new->bb_rightsib = cpu_to_be32(NULLAGBLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | xfs_inobt_log_block(args.tp, nbp, XFS_BB_ALL_BITS); |
| 943 | ASSERT(lbno != NULLAGBLOCK && rbno != NULLAGBLOCK); |
| 944 | /* |
| 945 | * Fill in the key data in the new root. |
| 946 | */ |
| 947 | kp = XFS_INOBT_KEY_ADDR(new, 1, cur); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 948 | if (be16_to_cpu(left->bb_level) > 0) { |
Christoph Hellwig | c38e5e8 | 2006-09-28 10:57:17 +1000 | [diff] [blame] | 949 | kp[0] = *XFS_INOBT_KEY_ADDR(left, 1, cur); |
| 950 | kp[1] = *XFS_INOBT_KEY_ADDR(right, 1, cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } else { |
| 952 | rp = XFS_INOBT_REC_ADDR(left, 1, cur); |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 953 | kp[0].ir_startino = rp->ir_startino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | rp = XFS_INOBT_REC_ADDR(right, 1, cur); |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 955 | kp[1].ir_startino = rp->ir_startino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
| 957 | xfs_inobt_log_keys(cur, nbp, 1, 2); |
| 958 | /* |
| 959 | * Fill in the pointer data in the new root. |
| 960 | */ |
| 961 | pp = XFS_INOBT_PTR_ADDR(new, 1, cur); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 962 | pp[0] = cpu_to_be32(lbno); |
| 963 | pp[1] = cpu_to_be32(rbno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | xfs_inobt_log_ptrs(cur, nbp, 1, 2); |
| 965 | /* |
| 966 | * Fix up the cursor. |
| 967 | */ |
| 968 | xfs_btree_setbuf(cur, cur->bc_nlevels, nbp); |
| 969 | cur->bc_ptrs[cur->bc_nlevels] = nptr; |
| 970 | cur->bc_nlevels++; |
| 971 | *stat = 1; |
| 972 | return 0; |
| 973 | } |
| 974 | |
| 975 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | * Split cur/level block in half. |
| 977 | * Return new block number and its first record (to be inserted into parent). |
| 978 | */ |
| 979 | STATIC int /* error */ |
| 980 | xfs_inobt_split( |
| 981 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 982 | int level, /* level to split */ |
| 983 | xfs_agblock_t *bnop, /* output: block number allocated */ |
| 984 | xfs_inobt_key_t *keyp, /* output: first key of new block */ |
| 985 | xfs_btree_cur_t **curp, /* output: new cursor */ |
| 986 | int *stat) /* success/failure */ |
| 987 | { |
| 988 | xfs_alloc_arg_t args; /* allocation argument structure */ |
| 989 | int error; /* error return value */ |
| 990 | int i; /* loop index/record number */ |
| 991 | xfs_agblock_t lbno; /* left (current) block number */ |
| 992 | xfs_buf_t *lbp; /* buffer for left block */ |
| 993 | xfs_inobt_block_t *left; /* left (current) btree block */ |
| 994 | xfs_inobt_key_t *lkp; /* left btree key pointer */ |
| 995 | xfs_inobt_ptr_t *lpp; /* left btree address pointer */ |
| 996 | xfs_inobt_rec_t *lrp; /* left btree record pointer */ |
| 997 | xfs_buf_t *rbp; /* buffer for right block */ |
| 998 | xfs_inobt_block_t *right; /* right (new) btree block */ |
| 999 | xfs_inobt_key_t *rkp; /* right btree key pointer */ |
| 1000 | xfs_inobt_ptr_t *rpp; /* right btree address pointer */ |
| 1001 | xfs_inobt_rec_t *rrp; /* right btree record pointer */ |
| 1002 | |
| 1003 | /* |
| 1004 | * Set up left block (current one). |
| 1005 | */ |
| 1006 | lbp = cur->bc_bufs[level]; |
| 1007 | args.tp = cur->bc_tp; |
| 1008 | args.mp = cur->bc_mp; |
| 1009 | lbno = XFS_DADDR_TO_AGBNO(args.mp, XFS_BUF_ADDR(lbp)); |
| 1010 | /* |
| 1011 | * Allocate the new block. |
| 1012 | * If we can't do it, we're toast. Give up. |
| 1013 | */ |
Christoph Hellwig | 169d622 | 2008-08-13 16:25:27 +1000 | [diff] [blame] | 1014 | args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, lbno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | args.mod = args.minleft = args.alignment = args.total = args.wasdel = |
| 1016 | args.isfl = args.userdata = args.minalignslop = 0; |
| 1017 | args.minlen = args.maxlen = args.prod = 1; |
| 1018 | args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| 1019 | if ((error = xfs_alloc_vextent(&args))) |
| 1020 | return error; |
| 1021 | if (args.fsbno == NULLFSBLOCK) { |
| 1022 | *stat = 0; |
| 1023 | return 0; |
| 1024 | } |
| 1025 | ASSERT(args.len == 1); |
| 1026 | rbp = xfs_btree_get_bufs(args.mp, args.tp, args.agno, args.agbno, 0); |
| 1027 | /* |
| 1028 | * Set up the new block as "right". |
| 1029 | */ |
| 1030 | right = XFS_BUF_TO_INOBT_BLOCK(rbp); |
| 1031 | /* |
| 1032 | * "Left" is the current (according to the cursor) block. |
| 1033 | */ |
| 1034 | left = XFS_BUF_TO_INOBT_BLOCK(lbp); |
| 1035 | #ifdef DEBUG |
| 1036 | if ((error = xfs_btree_check_sblock(cur, left, level, lbp))) |
| 1037 | return error; |
| 1038 | #endif |
| 1039 | /* |
| 1040 | * Fill in the btree header for the new block. |
| 1041 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1042 | right->bb_magic = cpu_to_be32(xfs_magics[cur->bc_btnum]); |
| 1043 | right->bb_level = left->bb_level; |
| 1044 | right->bb_numrecs = cpu_to_be16(be16_to_cpu(left->bb_numrecs) / 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | /* |
| 1046 | * Make sure that if there's an odd number of entries now, that |
| 1047 | * each new block will have the same number of entries. |
| 1048 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1049 | if ((be16_to_cpu(left->bb_numrecs) & 1) && |
| 1050 | cur->bc_ptrs[level] <= be16_to_cpu(right->bb_numrecs) + 1) |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 1051 | be16_add_cpu(&right->bb_numrecs, 1); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1052 | i = be16_to_cpu(left->bb_numrecs) - be16_to_cpu(right->bb_numrecs) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | /* |
| 1054 | * For non-leaf blocks, copy keys and addresses over to the new block. |
| 1055 | */ |
| 1056 | if (level > 0) { |
| 1057 | lkp = XFS_INOBT_KEY_ADDR(left, i, cur); |
| 1058 | lpp = XFS_INOBT_PTR_ADDR(left, i, cur); |
| 1059 | rkp = XFS_INOBT_KEY_ADDR(right, 1, cur); |
| 1060 | rpp = XFS_INOBT_PTR_ADDR(right, 1, cur); |
| 1061 | #ifdef DEBUG |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1062 | for (i = 0; i < be16_to_cpu(right->bb_numrecs); i++) { |
| 1063 | if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | return error; |
| 1065 | } |
| 1066 | #endif |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1067 | memcpy(rkp, lkp, be16_to_cpu(right->bb_numrecs) * sizeof(*rkp)); |
| 1068 | memcpy(rpp, lpp, be16_to_cpu(right->bb_numrecs) * sizeof(*rpp)); |
| 1069 | xfs_inobt_log_keys(cur, rbp, 1, be16_to_cpu(right->bb_numrecs)); |
| 1070 | xfs_inobt_log_ptrs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | *keyp = *rkp; |
| 1072 | } |
| 1073 | /* |
| 1074 | * For leaf blocks, copy records over to the new block. |
| 1075 | */ |
| 1076 | else { |
| 1077 | lrp = XFS_INOBT_REC_ADDR(left, i, cur); |
| 1078 | rrp = XFS_INOBT_REC_ADDR(right, 1, cur); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1079 | memcpy(rrp, lrp, be16_to_cpu(right->bb_numrecs) * sizeof(*rrp)); |
| 1080 | xfs_inobt_log_recs(cur, rbp, 1, be16_to_cpu(right->bb_numrecs)); |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 1081 | keyp->ir_startino = rrp->ir_startino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | } |
| 1083 | /* |
| 1084 | * Find the left block number by looking in the buffer. |
| 1085 | * Adjust numrecs, sibling pointers. |
| 1086 | */ |
Marcin Slusarz | 413d57c | 2008-02-13 15:03:29 -0800 | [diff] [blame] | 1087 | be16_add_cpu(&left->bb_numrecs, -(be16_to_cpu(right->bb_numrecs))); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1088 | right->bb_rightsib = left->bb_rightsib; |
| 1089 | left->bb_rightsib = cpu_to_be32(args.agbno); |
| 1090 | right->bb_leftsib = cpu_to_be32(lbno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | xfs_inobt_log_block(args.tp, rbp, XFS_BB_ALL_BITS); |
| 1092 | xfs_inobt_log_block(args.tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB); |
| 1093 | /* |
| 1094 | * If there's a block to the new block's right, make that block |
| 1095 | * point back to right instead of to left. |
| 1096 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1097 | if (be32_to_cpu(right->bb_rightsib) != NULLAGBLOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | xfs_inobt_block_t *rrblock; /* rr btree block */ |
| 1099 | xfs_buf_t *rrbp; /* buffer for rrblock */ |
| 1100 | |
| 1101 | if ((error = xfs_btree_read_bufs(args.mp, args.tp, args.agno, |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1102 | be32_to_cpu(right->bb_rightsib), 0, &rrbp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | XFS_INO_BTREE_REF))) |
| 1104 | return error; |
| 1105 | rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp); |
| 1106 | if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp))) |
| 1107 | return error; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1108 | rrblock->bb_leftsib = cpu_to_be32(args.agbno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | xfs_inobt_log_block(args.tp, rrbp, XFS_BB_LEFTSIB); |
| 1110 | } |
| 1111 | /* |
| 1112 | * If the cursor is really in the right block, move it there. |
| 1113 | * If it's just pointing past the last entry in left, then we'll |
| 1114 | * insert there, so don't change anything in that case. |
| 1115 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1116 | if (cur->bc_ptrs[level] > be16_to_cpu(left->bb_numrecs) + 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | xfs_btree_setbuf(cur, level, rbp); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1118 | cur->bc_ptrs[level] -= be16_to_cpu(left->bb_numrecs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | } |
| 1120 | /* |
| 1121 | * If there are more levels, we'll need another cursor which refers |
| 1122 | * the right block, no matter where this cursor was. |
| 1123 | */ |
| 1124 | if (level + 1 < cur->bc_nlevels) { |
| 1125 | if ((error = xfs_btree_dup_cursor(cur, curp))) |
| 1126 | return error; |
| 1127 | (*curp)->bc_ptrs[level + 1]++; |
| 1128 | } |
| 1129 | *bnop = args.agbno; |
| 1130 | *stat = 1; |
| 1131 | return 0; |
| 1132 | } |
| 1133 | |
| 1134 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | * Externally visible routines. |
| 1136 | */ |
| 1137 | |
| 1138 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | * Delete the record pointed to by cur. |
| 1140 | * The cursor refers to the place where the record was (could be inserted) |
| 1141 | * when the operation returns. |
| 1142 | */ |
| 1143 | int /* error */ |
| 1144 | xfs_inobt_delete( |
| 1145 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 1146 | int *stat) /* success/failure */ |
| 1147 | { |
| 1148 | int error; |
| 1149 | int i; /* result code */ |
| 1150 | int level; /* btree level */ |
| 1151 | |
| 1152 | /* |
| 1153 | * Go up the tree, starting at leaf level. |
| 1154 | * If 2 is returned then a join was done; go to the next level. |
| 1155 | * Otherwise we are done. |
| 1156 | */ |
| 1157 | for (level = 0, i = 2; i == 2; level++) { |
| 1158 | if ((error = xfs_inobt_delrec(cur, level, &i))) |
| 1159 | return error; |
| 1160 | } |
| 1161 | if (i == 0) { |
| 1162 | for (level = 1; level < cur->bc_nlevels; level++) { |
| 1163 | if (cur->bc_ptrs[level] == 0) { |
Christoph Hellwig | 8df4da4 | 2008-10-30 16:55:58 +1100 | [diff] [blame] | 1164 | if ((error = xfs_btree_decrement(cur, level, &i))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | return error; |
| 1166 | break; |
| 1167 | } |
| 1168 | } |
| 1169 | } |
| 1170 | *stat = i; |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | |
| 1175 | /* |
| 1176 | * Get the data from the pointed-to record. |
| 1177 | */ |
| 1178 | int /* error */ |
| 1179 | xfs_inobt_get_rec( |
| 1180 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 1181 | xfs_agino_t *ino, /* output: starting inode of chunk */ |
| 1182 | __int32_t *fcnt, /* output: number of free inodes */ |
| 1183 | xfs_inofree_t *free, /* output: free inode mask */ |
| 1184 | int *stat) /* output: success/failure */ |
| 1185 | { |
| 1186 | xfs_inobt_block_t *block; /* btree block */ |
| 1187 | xfs_buf_t *bp; /* buffer containing btree block */ |
| 1188 | #ifdef DEBUG |
| 1189 | int error; /* error return value */ |
| 1190 | #endif |
| 1191 | int ptr; /* record number */ |
| 1192 | xfs_inobt_rec_t *rec; /* record data */ |
| 1193 | |
| 1194 | bp = cur->bc_bufs[0]; |
| 1195 | ptr = cur->bc_ptrs[0]; |
| 1196 | block = XFS_BUF_TO_INOBT_BLOCK(bp); |
| 1197 | #ifdef DEBUG |
| 1198 | if ((error = xfs_btree_check_sblock(cur, block, 0, bp))) |
| 1199 | return error; |
| 1200 | #endif |
| 1201 | /* |
| 1202 | * Off the right end or left end, return failure. |
| 1203 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1204 | if (ptr > be16_to_cpu(block->bb_numrecs) || ptr <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | *stat = 0; |
| 1206 | return 0; |
| 1207 | } |
| 1208 | /* |
| 1209 | * Point to the record and extract its data. |
| 1210 | */ |
| 1211 | rec = XFS_INOBT_REC_ADDR(block, ptr, cur); |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 1212 | *ino = be32_to_cpu(rec->ir_startino); |
| 1213 | *fcnt = be32_to_cpu(rec->ir_freecount); |
| 1214 | *free = be64_to_cpu(rec->ir_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | *stat = 1; |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
| 1219 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | * Insert the current record at the point referenced by cur. |
| 1221 | * The cursor may be inconsistent on return if splits have been done. |
| 1222 | */ |
| 1223 | int /* error */ |
| 1224 | xfs_inobt_insert( |
| 1225 | xfs_btree_cur_t *cur, /* btree cursor */ |
| 1226 | int *stat) /* success/failure */ |
| 1227 | { |
| 1228 | int error; /* error return value */ |
| 1229 | int i; /* result value, 0 for failure */ |
| 1230 | int level; /* current level number in btree */ |
| 1231 | xfs_agblock_t nbno; /* new block number (split result) */ |
| 1232 | xfs_btree_cur_t *ncur; /* new cursor (split result) */ |
| 1233 | xfs_inobt_rec_t nrec; /* record being inserted this level */ |
| 1234 | xfs_btree_cur_t *pcur; /* previous level's cursor */ |
| 1235 | |
| 1236 | level = 0; |
| 1237 | nbno = NULLAGBLOCK; |
Christoph Hellwig | 61a2584 | 2006-09-28 10:57:04 +1000 | [diff] [blame] | 1238 | nrec.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino); |
| 1239 | nrec.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount); |
| 1240 | nrec.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free); |
Nathan Scott | 1121b21 | 2006-09-28 10:58:40 +1000 | [diff] [blame] | 1241 | ncur = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | pcur = cur; |
| 1243 | /* |
| 1244 | * Loop going up the tree, starting at the leaf level. |
| 1245 | * Stop when we don't get a split block, that must mean that |
| 1246 | * the insert is finished with this level. |
| 1247 | */ |
| 1248 | do { |
| 1249 | /* |
| 1250 | * Insert nrec/nbno into this level of the tree. |
| 1251 | * Note if we fail, nbno will be null. |
| 1252 | */ |
| 1253 | if ((error = xfs_inobt_insrec(pcur, level++, &nbno, &nrec, &ncur, |
| 1254 | &i))) { |
| 1255 | if (pcur != cur) |
| 1256 | xfs_btree_del_cursor(pcur, XFS_BTREE_ERROR); |
| 1257 | return error; |
| 1258 | } |
| 1259 | /* |
| 1260 | * See if the cursor we just used is trash. |
| 1261 | * Can't trash the caller's cursor, but otherwise we should |
| 1262 | * if ncur is a new cursor or we're about to be done. |
| 1263 | */ |
| 1264 | if (pcur != cur && (ncur || nbno == NULLAGBLOCK)) { |
| 1265 | cur->bc_nlevels = pcur->bc_nlevels; |
| 1266 | xfs_btree_del_cursor(pcur, XFS_BTREE_NOERROR); |
| 1267 | } |
| 1268 | /* |
| 1269 | * If we got a new cursor, switch to it. |
| 1270 | */ |
| 1271 | if (ncur) { |
| 1272 | pcur = ncur; |
Nathan Scott | 1121b21 | 2006-09-28 10:58:40 +1000 | [diff] [blame] | 1273 | ncur = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | } |
| 1275 | } while (nbno != NULLAGBLOCK); |
| 1276 | *stat = i; |
| 1277 | return 0; |
| 1278 | } |
| 1279 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 1280 | STATIC struct xfs_btree_cur * |
| 1281 | xfs_inobt_dup_cursor( |
| 1282 | struct xfs_btree_cur *cur) |
| 1283 | { |
| 1284 | return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp, |
| 1285 | cur->bc_private.a.agbp, cur->bc_private.a.agno); |
| 1286 | } |
| 1287 | |
Christoph Hellwig | ce5e42d | 2008-10-30 16:55:23 +1100 | [diff] [blame] | 1288 | STATIC int |
| 1289 | xfs_inobt_get_maxrecs( |
| 1290 | struct xfs_btree_cur *cur, |
| 1291 | int level) |
| 1292 | { |
| 1293 | return cur->bc_mp->m_inobt_mxr[level != 0]; |
| 1294 | } |
| 1295 | |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 1296 | STATIC void |
| 1297 | xfs_inobt_init_key_from_rec( |
| 1298 | union xfs_btree_key *key, |
| 1299 | union xfs_btree_rec *rec) |
| 1300 | { |
| 1301 | key->inobt.ir_startino = rec->inobt.ir_startino; |
| 1302 | } |
| 1303 | |
| 1304 | /* |
| 1305 | * intial value of ptr for lookup |
| 1306 | */ |
| 1307 | STATIC void |
| 1308 | xfs_inobt_init_ptr_from_cur( |
| 1309 | struct xfs_btree_cur *cur, |
| 1310 | union xfs_btree_ptr *ptr) |
| 1311 | { |
| 1312 | struct xfs_agi *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp); |
| 1313 | |
| 1314 | ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno)); |
| 1315 | |
| 1316 | ptr->s = agi->agi_root; |
| 1317 | } |
| 1318 | |
| 1319 | STATIC __int64_t |
| 1320 | xfs_inobt_key_diff( |
| 1321 | struct xfs_btree_cur *cur, |
| 1322 | union xfs_btree_key *key) |
| 1323 | { |
| 1324 | return (__int64_t)be32_to_cpu(key->inobt.ir_startino) - |
| 1325 | cur->bc_rec.i.ir_startino; |
| 1326 | } |
| 1327 | |
Christoph Hellwig | 8c4ed63 | 2008-10-30 16:55:13 +1100 | [diff] [blame] | 1328 | #ifdef XFS_BTREE_TRACE |
| 1329 | ktrace_t *xfs_inobt_trace_buf; |
| 1330 | |
| 1331 | STATIC void |
| 1332 | xfs_inobt_trace_enter( |
| 1333 | struct xfs_btree_cur *cur, |
| 1334 | const char *func, |
| 1335 | char *s, |
| 1336 | int type, |
| 1337 | int line, |
| 1338 | __psunsigned_t a0, |
| 1339 | __psunsigned_t a1, |
| 1340 | __psunsigned_t a2, |
| 1341 | __psunsigned_t a3, |
| 1342 | __psunsigned_t a4, |
| 1343 | __psunsigned_t a5, |
| 1344 | __psunsigned_t a6, |
| 1345 | __psunsigned_t a7, |
| 1346 | __psunsigned_t a8, |
| 1347 | __psunsigned_t a9, |
| 1348 | __psunsigned_t a10) |
| 1349 | { |
| 1350 | ktrace_enter(xfs_inobt_trace_buf, (void *)(__psint_t)type, |
| 1351 | (void *)func, (void *)s, NULL, (void *)cur, |
| 1352 | (void *)a0, (void *)a1, (void *)a2, (void *)a3, |
| 1353 | (void *)a4, (void *)a5, (void *)a6, (void *)a7, |
| 1354 | (void *)a8, (void *)a9, (void *)a10); |
| 1355 | } |
| 1356 | |
| 1357 | STATIC void |
| 1358 | xfs_inobt_trace_cursor( |
| 1359 | struct xfs_btree_cur *cur, |
| 1360 | __uint32_t *s0, |
| 1361 | __uint64_t *l0, |
| 1362 | __uint64_t *l1) |
| 1363 | { |
| 1364 | *s0 = cur->bc_private.a.agno; |
| 1365 | *l0 = cur->bc_rec.i.ir_startino; |
| 1366 | *l1 = cur->bc_rec.i.ir_free; |
| 1367 | } |
| 1368 | |
| 1369 | STATIC void |
| 1370 | xfs_inobt_trace_key( |
| 1371 | struct xfs_btree_cur *cur, |
| 1372 | union xfs_btree_key *key, |
| 1373 | __uint64_t *l0, |
| 1374 | __uint64_t *l1) |
| 1375 | { |
| 1376 | *l0 = be32_to_cpu(key->inobt.ir_startino); |
| 1377 | *l1 = 0; |
| 1378 | } |
| 1379 | |
| 1380 | STATIC void |
| 1381 | xfs_inobt_trace_record( |
| 1382 | struct xfs_btree_cur *cur, |
| 1383 | union xfs_btree_rec *rec, |
| 1384 | __uint64_t *l0, |
| 1385 | __uint64_t *l1, |
| 1386 | __uint64_t *l2) |
| 1387 | { |
| 1388 | *l0 = be32_to_cpu(rec->inobt.ir_startino); |
| 1389 | *l1 = be32_to_cpu(rec->inobt.ir_freecount); |
| 1390 | *l2 = be64_to_cpu(rec->inobt.ir_free); |
| 1391 | } |
| 1392 | #endif /* XFS_BTREE_TRACE */ |
| 1393 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 1394 | static const struct xfs_btree_ops xfs_inobt_ops = { |
Christoph Hellwig | 65f1eae | 2008-10-30 16:55:34 +1100 | [diff] [blame] | 1395 | .rec_len = sizeof(xfs_inobt_rec_t), |
| 1396 | .key_len = sizeof(xfs_inobt_key_t), |
| 1397 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 1398 | .dup_cursor = xfs_inobt_dup_cursor, |
Christoph Hellwig | ce5e42d | 2008-10-30 16:55:23 +1100 | [diff] [blame] | 1399 | .get_maxrecs = xfs_inobt_get_maxrecs, |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 1400 | .init_key_from_rec = xfs_inobt_init_key_from_rec, |
| 1401 | .init_ptr_from_cur = xfs_inobt_init_ptr_from_cur, |
| 1402 | .key_diff = xfs_inobt_key_diff, |
Christoph Hellwig | 8c4ed63 | 2008-10-30 16:55:13 +1100 | [diff] [blame] | 1403 | |
| 1404 | #ifdef XFS_BTREE_TRACE |
| 1405 | .trace_enter = xfs_inobt_trace_enter, |
| 1406 | .trace_cursor = xfs_inobt_trace_cursor, |
| 1407 | .trace_key = xfs_inobt_trace_key, |
| 1408 | .trace_record = xfs_inobt_trace_record, |
| 1409 | #endif |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 1410 | }; |
| 1411 | |
| 1412 | /* |
| 1413 | * Allocate a new inode btree cursor. |
| 1414 | */ |
| 1415 | struct xfs_btree_cur * /* new inode btree cursor */ |
| 1416 | xfs_inobt_init_cursor( |
| 1417 | struct xfs_mount *mp, /* file system mount point */ |
| 1418 | struct xfs_trans *tp, /* transaction pointer */ |
| 1419 | struct xfs_buf *agbp, /* buffer for agi structure */ |
| 1420 | xfs_agnumber_t agno) /* allocation group number */ |
| 1421 | { |
| 1422 | struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp); |
| 1423 | struct xfs_btree_cur *cur; |
| 1424 | |
| 1425 | cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); |
| 1426 | |
| 1427 | cur->bc_tp = tp; |
| 1428 | cur->bc_mp = mp; |
| 1429 | cur->bc_nlevels = be32_to_cpu(agi->agi_level); |
| 1430 | cur->bc_btnum = XFS_BTNUM_INO; |
| 1431 | cur->bc_blocklog = mp->m_sb.sb_blocklog; |
| 1432 | |
| 1433 | cur->bc_ops = &xfs_inobt_ops; |
| 1434 | |
| 1435 | cur->bc_private.a.agbp = agbp; |
| 1436 | cur->bc_private.a.agno = agno; |
| 1437 | |
| 1438 | return cur; |
| 1439 | } |