1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * Copyright (c) 2013 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7 #include "xfs.h" 8 #include "xfs_fs.h" 9 #include "xfs_shared.h" 10 #include "xfs_format.h" 11 #include "xfs_log_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_bit.h" 14 #include "xfs_mount.h" 15 #include "xfs_da_format.h" 16 #include "xfs_da_btree.h" 17 #include "xfs_inode.h" 18 #include "xfs_attr.h" 19 #include "xfs_attr_remote.h" 20 #include "xfs_trans.h" 21 #include "xfs_bmap.h" 22 #include "xfs_attr_leaf.h" 23 #include "xfs_quota.h" 24 #include "xfs_dir2.h" 25 #include "xfs_error.h" 26 27 /* 28 * Invalidate any incore buffers associated with this remote attribute value 29 * extent. We never log remote attribute value buffers, which means that they 30 * won't be attached to a transaction and are therefore safe to mark stale. 31 * The actual bunmapi will be taken care of later. 32 */ 33 STATIC int 34 xfs_attr3_rmt_stale( 35 struct xfs_inode *dp, 36 xfs_dablk_t blkno, 37 int blkcnt) 38 { 39 struct xfs_bmbt_irec map; 40 int nmap; 41 int error; 42 43 /* 44 * Roll through the "value", invalidating the attribute value's 45 * blocks. 46 */ 47 while (blkcnt > 0) { 48 /* 49 * Try to remember where we decided to put the value. 50 */ 51 nmap = 1; 52 error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt, 53 &map, &nmap, XFS_BMAPI_ATTRFORK); 54 if (error) 55 return error; 56 if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1)) 57 return -EFSCORRUPTED; 58 59 /* 60 * Mark any incore buffers for the remote value as stale. We 61 * never log remote attr value buffers, so the buffer should be 62 * easy to kill. 63 */ 64 error = xfs_attr_rmtval_stale(dp, &map, 0); 65 if (error) 66 return error; 67 68 blkno += map.br_blockcount; 69 blkcnt -= map.br_blockcount; 70 } 71 72 return 0; 73 } 74 75 /* 76 * Invalidate all of the "remote" value regions pointed to by a particular 77 * leaf block. 78 * Note that we must release the lock on the buffer so that we are not 79 * caught holding something that the logging code wants to flush to disk. 80 */ 81 STATIC int 82 xfs_attr3_leaf_inactive( 83 struct xfs_trans **trans, 84 struct xfs_inode *dp, 85 struct xfs_buf *bp) 86 { 87 struct xfs_attr3_icleaf_hdr ichdr; 88 struct xfs_mount *mp = bp->b_mount; 89 struct xfs_attr_leafblock *leaf = bp->b_addr; 90 struct xfs_attr_leaf_entry *entry; 91 struct xfs_attr_leaf_name_remote *name_rmt; 92 int error = 0; 93 int i; 94 95 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); 96 97 /* 98 * Find the remote value extents for this leaf and invalidate their 99 * incore buffers. 100 */ 101 entry = xfs_attr3_leaf_entryp(leaf); 102 for (i = 0; i < ichdr.count; entry++, i++) { 103 int blkcnt; 104 105 if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL)) 106 continue; 107 108 name_rmt = xfs_attr3_leaf_name_remote(leaf, i); 109 if (!name_rmt->valueblk) 110 continue; 111 112 blkcnt = xfs_attr3_rmt_blocks(dp->i_mount, 113 be32_to_cpu(name_rmt->valuelen)); 114 error = xfs_attr3_rmt_stale(dp, 115 be32_to_cpu(name_rmt->valueblk), blkcnt); 116 if (error) 117 goto err; 118 } 119 120 xfs_trans_brelse(*trans, bp); 121 err: 122 return error; 123 } 124 125 /* 126 * Recurse (gasp!) through the attribute nodes until we find leaves. 127 * We're doing a depth-first traversal in order to invalidate everything. 128 */ 129 STATIC int 130 xfs_attr3_node_inactive( 131 struct xfs_trans **trans, 132 struct xfs_inode *dp, 133 struct xfs_buf *bp, 134 int level) 135 { 136 struct xfs_mount *mp = dp->i_mount; 137 struct xfs_da_blkinfo *info; 138 xfs_dablk_t child_fsb; 139 xfs_daddr_t parent_blkno, child_blkno; 140 struct xfs_buf *child_bp; 141 struct xfs_da3_icnode_hdr ichdr; 142 int error, i; 143 144 /* 145 * Since this code is recursive (gasp!) we must protect ourselves. 146 */ 147 if (level > XFS_DA_NODE_MAXDEPTH) { 148 xfs_buf_mark_corrupt(bp); 149 xfs_trans_brelse(*trans, bp); /* no locks for later trans */ 150 return -EFSCORRUPTED; 151 } 152 153 xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr); 154 parent_blkno = xfs_buf_daddr(bp); 155 if (!ichdr.count) { 156 xfs_trans_brelse(*trans, bp); 157 return 0; 158 } 159 child_fsb = be32_to_cpu(ichdr.btree[0].before); 160 xfs_trans_brelse(*trans, bp); /* no locks for later trans */ 161 bp = NULL; 162 163 /* 164 * If this is the node level just above the leaves, simply loop 165 * over the leaves removing all of them. If this is higher up 166 * in the tree, recurse downward. 167 */ 168 for (i = 0; i < ichdr.count; i++) { 169 /* 170 * Read the subsidiary block to see what we have to work with. 171 * Don't do this in a transaction. This is a depth-first 172 * traversal of the tree so we may deal with many blocks 173 * before we come back to this one. 174 */ 175 error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp, 176 XFS_ATTR_FORK); 177 if (error) 178 return error; 179 180 /* save for re-read later */ 181 child_blkno = xfs_buf_daddr(child_bp); 182 183 /* 184 * Invalidate the subtree, however we have to. 185 */ 186 info = child_bp->b_addr; 187 switch (info->magic) { 188 case cpu_to_be16(XFS_DA_NODE_MAGIC): 189 case cpu_to_be16(XFS_DA3_NODE_MAGIC): 190 error = xfs_attr3_node_inactive(trans, dp, child_bp, 191 level + 1); 192 break; 193 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): 194 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): 195 error = xfs_attr3_leaf_inactive(trans, dp, child_bp); 196 break; 197 default: 198 xfs_buf_mark_corrupt(child_bp); 199 xfs_trans_brelse(*trans, child_bp); 200 error = -EFSCORRUPTED; 201 break; 202 } 203 if (error) 204 return error; 205 206 /* 207 * Remove the subsidiary block from the cache and from the log. 208 */ 209 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, 210 child_blkno, 211 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, 212 &child_bp); 213 if (error) 214 return error; 215 xfs_trans_binval(*trans, child_bp); 216 child_bp = NULL; 217 218 /* 219 * If we're not done, re-read the parent to get the next 220 * child block number. 221 */ 222 if (i + 1 < ichdr.count) { 223 struct xfs_da3_icnode_hdr phdr; 224 225 error = xfs_da3_node_read_mapped(*trans, dp, 226 parent_blkno, &bp, XFS_ATTR_FORK); 227 if (error) 228 return error; 229 xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr, 230 bp->b_addr); 231 child_fsb = be32_to_cpu(phdr.btree[i + 1].before); 232 xfs_trans_brelse(*trans, bp); 233 bp = NULL; 234 } 235 /* 236 * Atomically commit the whole invalidate stuff. 237 */ 238 error = xfs_trans_roll_inode(trans, dp); 239 if (error) 240 return error; 241 } 242 243 return 0; 244 } 245 246 /* 247 * Indiscriminately delete the entire attribute fork 248 * 249 * Recurse (gasp!) through the attribute nodes until we find leaves. 250 * We're doing a depth-first traversal in order to invalidate everything. 251 */ 252 static int 253 xfs_attr3_root_inactive( 254 struct xfs_trans **trans, 255 struct xfs_inode *dp) 256 { 257 struct xfs_mount *mp = dp->i_mount; 258 struct xfs_da_blkinfo *info; 259 struct xfs_buf *bp; 260 xfs_daddr_t blkno; 261 int error; 262 263 /* 264 * Read block 0 to see what we have to work with. 265 * We only get here if we have extents, since we remove 266 * the extents in reverse order the extent containing 267 * block 0 must still be there. 268 */ 269 error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK); 270 if (error) 271 return error; 272 blkno = xfs_buf_daddr(bp); 273 274 /* 275 * Invalidate the tree, even if the "tree" is only a single leaf block. 276 * This is a depth-first traversal! 277 */ 278 info = bp->b_addr; 279 switch (info->magic) { 280 case cpu_to_be16(XFS_DA_NODE_MAGIC): 281 case cpu_to_be16(XFS_DA3_NODE_MAGIC): 282 error = xfs_attr3_node_inactive(trans, dp, bp, 1); 283 break; 284 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): 285 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): 286 error = xfs_attr3_leaf_inactive(trans, dp, bp); 287 break; 288 default: 289 error = -EFSCORRUPTED; 290 xfs_buf_mark_corrupt(bp); 291 xfs_trans_brelse(*trans, bp); 292 break; 293 } 294 if (error) 295 return error; 296 297 /* 298 * Invalidate the incore copy of the root block. 299 */ 300 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno, 301 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp); 302 if (error) 303 return error; 304 error = bp->b_error; 305 if (error) { 306 xfs_trans_brelse(*trans, bp); 307 return error; 308 } 309 xfs_trans_binval(*trans, bp); /* remove from cache */ 310 /* 311 * Commit the invalidate and start the next transaction. 312 */ 313 error = xfs_trans_roll_inode(trans, dp); 314 315 return error; 316 } 317 318 /* 319 * xfs_attr_inactive kills all traces of an attribute fork on an inode. It 320 * removes both the on-disk and in-memory inode fork. Note that this also has to 321 * handle the condition of inodes without attributes but with an attribute fork 322 * configured, so we can't use xfs_inode_hasattr() here. 323 * 324 * The in-memory attribute fork is removed even on error. 325 */ 326 int 327 xfs_attr_inactive( 328 struct xfs_inode *dp) 329 { 330 struct xfs_trans *trans; 331 struct xfs_mount *mp; 332 int lock_mode = XFS_ILOCK_SHARED; 333 int error = 0; 334 335 mp = dp->i_mount; 336 337 xfs_ilock(dp, lock_mode); 338 if (!xfs_inode_has_attr_fork(dp)) 339 goto out_destroy_fork; 340 xfs_iunlock(dp, lock_mode); 341 342 lock_mode = 0; 343 344 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans); 345 if (error) 346 goto out_destroy_fork; 347 348 lock_mode = XFS_ILOCK_EXCL; 349 xfs_ilock(dp, lock_mode); 350 351 if (!xfs_inode_has_attr_fork(dp)) 352 goto out_cancel; 353 354 /* 355 * No need to make quota reservations here. We expect to release some 356 * blocks, not allocate, in the common case. 357 */ 358 xfs_trans_ijoin(trans, dp, 0); 359 360 /* 361 * Invalidate and truncate the attribute fork extents. Make sure the 362 * fork actually has xattr blocks as otherwise the invalidation has no 363 * blocks to read and returns an error. In this case, just do the fork 364 * removal below. 365 */ 366 if (dp->i_af.if_nextents > 0) { 367 error = xfs_attr3_root_inactive(&trans, dp); 368 if (error) 369 goto out_cancel; 370 371 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0); 372 if (error) 373 goto out_cancel; 374 } 375 376 /* Reset the attribute fork - this also destroys the in-core fork */ 377 xfs_attr_fork_remove(dp, trans); 378 379 error = xfs_trans_commit(trans); 380 xfs_iunlock(dp, lock_mode); 381 return error; 382 383 out_cancel: 384 xfs_trans_cancel(trans); 385 out_destroy_fork: 386 /* kill the in-core attr fork before we drop the inode lock */ 387 xfs_ifork_zap_attr(dp); 388 if (lock_mode) 389 xfs_iunlock(dp, lock_mode); 390 return error; 391 } 392