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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 | /* * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir2.h" #include "xfs_dmapi.h" #include "xfs_mount.h" #include "xfs_bmap_btree.h" #include "xfs_dir2_sf.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_inode_item.h" #include "xfs_bmap.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_rw.h" #include "xfs_itable.h" #include "xfs_utils.h" /* * xfs_get_dir_entry is used to get a reference to an inode given * its parent directory inode and the name of the file. It does * not lock the child inode, and it unlocks the directory before * returning. The directory's generation number is returned for * use by a later call to xfs_lock_dir_and_entry. */ int xfs_get_dir_entry( bhv_vname_t *dentry, xfs_inode_t **ipp) { bhv_vnode_t *vp; vp = VNAME_TO_VNODE(dentry); *ipp = xfs_vtoi(vp); if (!*ipp) return XFS_ERROR(ENOENT); VN_HOLD(vp); return 0; } int xfs_dir_lookup_int( bhv_desc_t *dir_bdp, uint lock_mode, bhv_vname_t *dentry, xfs_ino_t *inum, xfs_inode_t **ipp) { bhv_vnode_t *dir_vp; xfs_inode_t *dp; int error; dir_vp = BHV_TO_VNODE(dir_bdp); vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); dp = XFS_BHVTOI(dir_bdp); error = xfs_dir_lookup(NULL, dp, VNAME(dentry), VNAMELEN(dentry), inum); if (!error) { /* * Unlock the directory. We do this because we can't * hold the directory lock while doing the vn_get() * in xfs_iget(). Doing so could cause us to hold * a lock while waiting for the inode to finish * being inactive while it's waiting for a log * reservation in the inactive routine. */ xfs_iunlock(dp, lock_mode); error = xfs_iget(dp->i_mount, NULL, *inum, 0, 0, ipp, 0); xfs_ilock(dp, lock_mode); if (error) { *ipp = NULL; } else if ((*ipp)->i_d.di_mode == 0) { /* * The inode has been freed. Something is * wrong so just get out of here. */ xfs_iunlock(dp, lock_mode); xfs_iput_new(*ipp, 0); *ipp = NULL; xfs_ilock(dp, lock_mode); error = XFS_ERROR(ENOENT); } } return error; } /* * Allocates a new inode from disk and return a pointer to the * incore copy. This routine will internally commit the current * transaction and allocate a new one if the Space Manager needed * to do an allocation to replenish the inode free-list. * * This routine is designed to be called from xfs_create and * xfs_create_dir. * */ int xfs_dir_ialloc( xfs_trans_t **tpp, /* input: current transaction; output: may be a new transaction. */ xfs_inode_t *dp, /* directory within whose allocate the inode. */ mode_t mode, xfs_nlink_t nlink, xfs_dev_t rdev, cred_t *credp, prid_t prid, /* project id */ int okalloc, /* ok to allocate new space */ xfs_inode_t **ipp, /* pointer to inode; it will be locked. */ int *committed) { xfs_trans_t *tp; xfs_trans_t *ntp; xfs_inode_t *ip; xfs_buf_t *ialloc_context = NULL; boolean_t call_again = B_FALSE; int code; uint log_res; uint log_count; void *dqinfo; uint tflags; tp = *tpp; ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); /* * xfs_ialloc will return a pointer to an incore inode if * the Space Manager has an available inode on the free * list. Otherwise, it will do an allocation and replenish * the freelist. Since we can only do one allocation per * transaction without deadlocks, we will need to commit the * current transaction and start a new one. We will then * need to call xfs_ialloc again to get the inode. * * If xfs_ialloc did an allocation to replenish the freelist, * it returns the bp containing the head of the freelist as * ialloc_context. We will hold a lock on it across the * transaction commit so that no other process can steal * the inode(s) that we've just allocated. */ code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc, &ialloc_context, &call_again, &ip); /* * Return an error if we were unable to allocate a new inode. * This should only happen if we run out of space on disk or * encounter a disk error. */ if (code) { *ipp = NULL; return code; } if (!call_again && (ip == NULL)) { *ipp = NULL; return XFS_ERROR(ENOSPC); } /* * If call_again is set, then we were unable to get an * inode in one operation. We need to commit the current * transaction and call xfs_ialloc() again. It is guaranteed * to succeed the second time. */ if (call_again) { /* * Normally, xfs_trans_commit releases all the locks. * We call bhold to hang on to the ialloc_context across * the commit. Holding this buffer prevents any other * processes from doing any allocations in this * allocation group. */ xfs_trans_bhold(tp, ialloc_context); /* * Save the log reservation so we can use * them in the next transaction. */ log_res = xfs_trans_get_log_res(tp); log_count = xfs_trans_get_log_count(tp); /* * We want the quota changes to be associated with the next * transaction, NOT this one. So, detach the dqinfo from this * and attach it to the next transaction. */ dqinfo = NULL; tflags = 0; if (tp->t_dqinfo) { dqinfo = (void *)tp->t_dqinfo; tp->t_dqinfo = NULL; tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY; tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY); } ntp = xfs_trans_dup(tp); code = xfs_trans_commit(tp, 0, NULL); tp = ntp; if (committed != NULL) { *committed = 1; } /* * If we get an error during the commit processing, * release the buffer that is still held and return * to the caller. */ if (code) { xfs_buf_relse(ialloc_context); if (dqinfo) { tp->t_dqinfo = dqinfo; XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp); } *tpp = ntp; *ipp = NULL; return code; } code = xfs_trans_reserve(tp, 0, log_res, 0, XFS_TRANS_PERM_LOG_RES, log_count); /* * Re-attach the quota info that we detached from prev trx. */ if (dqinfo) { tp->t_dqinfo = dqinfo; tp->t_flags |= tflags; } if (code) { xfs_buf_relse(ialloc_context); *tpp = ntp; *ipp = NULL; return code; } xfs_trans_bjoin(tp, ialloc_context); /* * Call ialloc again. Since we've locked out all * other allocations in this allocation group, * this call should always succeed. */ code = xfs_ialloc(tp, dp, mode, nlink, rdev, credp, prid, okalloc, &ialloc_context, &call_again, &ip); /* * If we get an error at this point, return to the caller * so that the current transaction can be aborted. */ if (code) { *tpp = tp; *ipp = NULL; return code; } ASSERT ((!call_again) && (ip != NULL)); } else { if (committed != NULL) { *committed = 0; } } *ipp = ip; *tpp = tp; return 0; } /* * Decrement the link count on an inode & log the change. * If this causes the link count to go to zero, initiate the * logging activity required to truncate a file. */ int /* error */ xfs_droplink( xfs_trans_t *tp, xfs_inode_t *ip) { int error; xfs_ichgtime(ip, XFS_ICHGTIME_CHG); ASSERT (ip->i_d.di_nlink > 0); ip->i_d.di_nlink--; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); error = 0; if (ip->i_d.di_nlink == 0) { /* * We're dropping the last link to this file. * Move the on-disk inode to the AGI unlinked list. * From xfs_inactive() we will pull the inode from * the list and free it. */ error = xfs_iunlink(tp, ip); } return error; } /* * This gets called when the inode's version needs to be changed from 1 to 2. * Currently this happens when the nlink field overflows the old 16-bit value * or when chproj is called to change the project for the first time. * As a side effect the superblock version will also get rev'd * to contain the NLINK bit. */ void xfs_bump_ino_vers2( xfs_trans_t *tp, xfs_inode_t *ip) { xfs_mount_t *mp; unsigned long s; ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE)); ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1); ip->i_d.di_version = XFS_DINODE_VERSION_2; ip->i_d.di_onlink = 0; memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); mp = tp->t_mountp; if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { s = XFS_SB_LOCK(mp); if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { XFS_SB_VERSION_ADDNLINK(&mp->m_sb); XFS_SB_UNLOCK(mp, s); xfs_mod_sb(tp, XFS_SB_VERSIONNUM); } else { XFS_SB_UNLOCK(mp, s); } } /* Caller must log the inode */ } /* * Increment the link count on an inode & log the change. */ int xfs_bumplink( xfs_trans_t *tp, xfs_inode_t *ip) { if (ip->i_d.di_nlink >= XFS_MAXLINK) return XFS_ERROR(EMLINK); xfs_ichgtime(ip, XFS_ICHGTIME_CHG); ASSERT(ip->i_d.di_nlink > 0); ip->i_d.di_nlink++; if ((ip->i_d.di_version == XFS_DINODE_VERSION_1) && (ip->i_d.di_nlink > XFS_MAXLINK_1)) { /* * The inode has increased its number of links beyond * what can fit in an old format inode. It now needs * to be converted to a version 2 inode with a 32 bit * link count. If this is the first inode in the file * system to do this, then we need to bump the superblock * version number as well. */ xfs_bump_ino_vers2(tp, ip); } xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); return 0; } /* * Try to truncate the given file to 0 length. Currently called * only out of xfs_remove when it has to truncate a file to free * up space for the remove to proceed. */ int xfs_truncate_file( xfs_mount_t *mp, xfs_inode_t *ip) { xfs_trans_t *tp; int error; #ifdef QUOTADEBUG /* * This is called to truncate the quotainodes too. */ if (XFS_IS_UQUOTA_ON(mp)) { if (ip->i_ino != mp->m_sb.sb_uquotino) ASSERT(ip->i_udquot); } if (XFS_IS_OQUOTA_ON(mp)) { if (ip->i_ino != mp->m_sb.sb_gquotino) ASSERT(ip->i_gdquot); } #endif /* * Make the call to xfs_itruncate_start before starting the * transaction, because we cannot make the call while we're * in a transaction. */ xfs_ilock(ip, XFS_IOLOCK_EXCL); xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, (xfs_fsize_t)0); tp = xfs_trans_alloc(mp, XFS_TRANS_TRUNCATE_FILE); if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { xfs_trans_cancel(tp, 0); xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; } /* * Follow the normal truncate locking protocol. Since we * hold the inode in the transaction, we know that it's number * of references will stay constant. */ xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); xfs_trans_ihold(tp, ip); /* * Signal a sync xaction. The only case where that isn't * the case is if we're truncating an already unlinked file * on a wsync fs. In that case, we know the blocks can't * reappear in the file because the links to file are * permanently toast. Currently, we're always going to * want a sync transaction because this code is being * called from places where nlink is guaranteed to be 1 * but I'm leaving the tests in to protect against future * changes -- rcc. */ error = xfs_itruncate_finish(&tp, ip, (xfs_fsize_t)0, XFS_DATA_FORK, ((ip->i_d.di_nlink != 0 || !(mp->m_flags & XFS_MOUNT_WSYNC)) ? 1 : 0)); if (error) { xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); } else { xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); } xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); return error; } |