| 1 | /* |
| 2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
| 4 | * |
| 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 |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 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. |
| 13 | * |
| 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 |
| 17 | */ |
| 18 | #include "xfs.h" |
| 19 | #include "xfs_fs.h" |
| 20 | #include "xfs_shared.h" |
| 21 | #include "xfs_format.h" |
| 22 | #include "xfs_log_format.h" |
| 23 | #include "xfs_trans_resv.h" |
| 24 | #include "xfs_mount.h" |
| 25 | #include "xfs_inode.h" |
| 26 | #include "xfs_btree.h" |
| 27 | #include "xfs_ialloc.h" |
| 28 | #include "xfs_ialloc_btree.h" |
| 29 | #include "xfs_itable.h" |
| 30 | #include "xfs_error.h" |
| 31 | #include "xfs_trace.h" |
| 32 | #include "xfs_icache.h" |
| 33 | |
| 34 | STATIC int |
| 35 | xfs_internal_inum( |
| 36 | xfs_mount_t *mp, |
| 37 | xfs_ino_t ino) |
| 38 | { |
| 39 | return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino || |
| 40 | (xfs_sb_version_hasquota(&mp->m_sb) && |
| 41 | xfs_is_quota_inode(&mp->m_sb, ino))); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Return stat information for one inode. |
| 46 | * Return 0 if ok, else errno. |
| 47 | */ |
| 48 | int |
| 49 | xfs_bulkstat_one_int( |
| 50 | struct xfs_mount *mp, /* mount point for filesystem */ |
| 51 | xfs_ino_t ino, /* inode to get data for */ |
| 52 | void __user *buffer, /* buffer to place output in */ |
| 53 | int ubsize, /* size of buffer */ |
| 54 | bulkstat_one_fmt_pf formatter, /* formatter, copy to user */ |
| 55 | int *ubused, /* bytes used by me */ |
| 56 | int *stat) /* BULKSTAT_RV_... */ |
| 57 | { |
| 58 | struct xfs_icdinode *dic; /* dinode core info pointer */ |
| 59 | struct xfs_inode *ip; /* incore inode pointer */ |
| 60 | struct xfs_bstat *buf; /* return buffer */ |
| 61 | int error = 0; /* error value */ |
| 62 | |
| 63 | *stat = BULKSTAT_RV_NOTHING; |
| 64 | |
| 65 | if (!buffer || xfs_internal_inum(mp, ino)) |
| 66 | return -EINVAL; |
| 67 | |
| 68 | buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL); |
| 69 | if (!buf) |
| 70 | return -ENOMEM; |
| 71 | |
| 72 | error = xfs_iget(mp, NULL, ino, |
| 73 | (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED), |
| 74 | XFS_ILOCK_SHARED, &ip); |
| 75 | if (error) |
| 76 | goto out_free; |
| 77 | |
| 78 | ASSERT(ip != NULL); |
| 79 | ASSERT(ip->i_imap.im_blkno != 0); |
| 80 | |
| 81 | dic = &ip->i_d; |
| 82 | |
| 83 | /* xfs_iget returns the following without needing |
| 84 | * further change. |
| 85 | */ |
| 86 | buf->bs_nlink = dic->di_nlink; |
| 87 | buf->bs_projid_lo = dic->di_projid_lo; |
| 88 | buf->bs_projid_hi = dic->di_projid_hi; |
| 89 | buf->bs_ino = ino; |
| 90 | buf->bs_mode = dic->di_mode; |
| 91 | buf->bs_uid = dic->di_uid; |
| 92 | buf->bs_gid = dic->di_gid; |
| 93 | buf->bs_size = dic->di_size; |
| 94 | buf->bs_atime.tv_sec = dic->di_atime.t_sec; |
| 95 | buf->bs_atime.tv_nsec = dic->di_atime.t_nsec; |
| 96 | buf->bs_mtime.tv_sec = dic->di_mtime.t_sec; |
| 97 | buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec; |
| 98 | buf->bs_ctime.tv_sec = dic->di_ctime.t_sec; |
| 99 | buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec; |
| 100 | buf->bs_xflags = xfs_ip2xflags(ip); |
| 101 | buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog; |
| 102 | buf->bs_extents = dic->di_nextents; |
| 103 | buf->bs_gen = dic->di_gen; |
| 104 | memset(buf->bs_pad, 0, sizeof(buf->bs_pad)); |
| 105 | buf->bs_dmevmask = dic->di_dmevmask; |
| 106 | buf->bs_dmstate = dic->di_dmstate; |
| 107 | buf->bs_aextents = dic->di_anextents; |
| 108 | buf->bs_forkoff = XFS_IFORK_BOFF(ip); |
| 109 | |
| 110 | switch (dic->di_format) { |
| 111 | case XFS_DINODE_FMT_DEV: |
| 112 | buf->bs_rdev = ip->i_df.if_u2.if_rdev; |
| 113 | buf->bs_blksize = BLKDEV_IOSIZE; |
| 114 | buf->bs_blocks = 0; |
| 115 | break; |
| 116 | case XFS_DINODE_FMT_LOCAL: |
| 117 | case XFS_DINODE_FMT_UUID: |
| 118 | buf->bs_rdev = 0; |
| 119 | buf->bs_blksize = mp->m_sb.sb_blocksize; |
| 120 | buf->bs_blocks = 0; |
| 121 | break; |
| 122 | case XFS_DINODE_FMT_EXTENTS: |
| 123 | case XFS_DINODE_FMT_BTREE: |
| 124 | buf->bs_rdev = 0; |
| 125 | buf->bs_blksize = mp->m_sb.sb_blocksize; |
| 126 | buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks; |
| 127 | break; |
| 128 | } |
| 129 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 130 | IRELE(ip); |
| 131 | |
| 132 | error = formatter(buffer, ubsize, ubused, buf); |
| 133 | if (!error) |
| 134 | *stat = BULKSTAT_RV_DIDONE; |
| 135 | |
| 136 | out_free: |
| 137 | kmem_free(buf); |
| 138 | return error; |
| 139 | } |
| 140 | |
| 141 | /* Return 0 on success or positive error */ |
| 142 | STATIC int |
| 143 | xfs_bulkstat_one_fmt( |
| 144 | void __user *ubuffer, |
| 145 | int ubsize, |
| 146 | int *ubused, |
| 147 | const xfs_bstat_t *buffer) |
| 148 | { |
| 149 | if (ubsize < sizeof(*buffer)) |
| 150 | return -ENOMEM; |
| 151 | if (copy_to_user(ubuffer, buffer, sizeof(*buffer))) |
| 152 | return -EFAULT; |
| 153 | if (ubused) |
| 154 | *ubused = sizeof(*buffer); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | int |
| 159 | xfs_bulkstat_one( |
| 160 | xfs_mount_t *mp, /* mount point for filesystem */ |
| 161 | xfs_ino_t ino, /* inode number to get data for */ |
| 162 | void __user *buffer, /* buffer to place output in */ |
| 163 | int ubsize, /* size of buffer */ |
| 164 | int *ubused, /* bytes used by me */ |
| 165 | int *stat) /* BULKSTAT_RV_... */ |
| 166 | { |
| 167 | return xfs_bulkstat_one_int(mp, ino, buffer, ubsize, |
| 168 | xfs_bulkstat_one_fmt, ubused, stat); |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Loop over all clusters in a chunk for a given incore inode allocation btree |
| 173 | * record. Do a readahead if there are any allocated inodes in that cluster. |
| 174 | */ |
| 175 | STATIC void |
| 176 | xfs_bulkstat_ichunk_ra( |
| 177 | struct xfs_mount *mp, |
| 178 | xfs_agnumber_t agno, |
| 179 | struct xfs_inobt_rec_incore *irec) |
| 180 | { |
| 181 | xfs_agblock_t agbno; |
| 182 | struct blk_plug plug; |
| 183 | int blks_per_cluster; |
| 184 | int inodes_per_cluster; |
| 185 | int i; /* inode chunk index */ |
| 186 | |
| 187 | agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino); |
| 188 | blks_per_cluster = xfs_icluster_size_fsb(mp); |
| 189 | inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog; |
| 190 | |
| 191 | blk_start_plug(&plug); |
| 192 | for (i = 0; i < XFS_INODES_PER_CHUNK; |
| 193 | i += inodes_per_cluster, agbno += blks_per_cluster) { |
| 194 | if (xfs_inobt_maskn(i, inodes_per_cluster) & ~irec->ir_free) { |
| 195 | xfs_btree_reada_bufs(mp, agno, agbno, blks_per_cluster, |
| 196 | &xfs_inode_buf_ops); |
| 197 | } |
| 198 | } |
| 199 | blk_finish_plug(&plug); |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * Lookup the inode chunk that the given inode lives in and then get the record |
| 204 | * if we found the chunk. If the inode was not the last in the chunk and there |
| 205 | * are some left allocated, update the data for the pointed-to record as well as |
| 206 | * return the count of grabbed inodes. |
| 207 | */ |
| 208 | STATIC int |
| 209 | xfs_bulkstat_grab_ichunk( |
| 210 | struct xfs_btree_cur *cur, /* btree cursor */ |
| 211 | xfs_agino_t agino, /* starting inode of chunk */ |
| 212 | int *icount,/* return # of inodes grabbed */ |
| 213 | struct xfs_inobt_rec_incore *irec) /* btree record */ |
| 214 | { |
| 215 | int idx; /* index into inode chunk */ |
| 216 | int stat; |
| 217 | int error = 0; |
| 218 | |
| 219 | /* Lookup the inode chunk that this inode lives in */ |
| 220 | error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &stat); |
| 221 | if (error) |
| 222 | return error; |
| 223 | if (!stat) { |
| 224 | *icount = 0; |
| 225 | return error; |
| 226 | } |
| 227 | |
| 228 | /* Get the record, should always work */ |
| 229 | error = xfs_inobt_get_rec(cur, irec, &stat); |
| 230 | if (error) |
| 231 | return error; |
| 232 | XFS_WANT_CORRUPTED_RETURN(stat == 1); |
| 233 | |
| 234 | /* Check if the record contains the inode in request */ |
| 235 | if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino) { |
| 236 | *icount = 0; |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | idx = agino - irec->ir_startino + 1; |
| 241 | if (idx < XFS_INODES_PER_CHUNK && |
| 242 | (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK - idx) & ~irec->ir_free)) { |
| 243 | int i; |
| 244 | |
| 245 | /* We got a right chunk with some left inodes allocated at it. |
| 246 | * Grab the chunk record. Mark all the uninteresting inodes |
| 247 | * free -- because they're before our start point. |
| 248 | */ |
| 249 | for (i = 0; i < idx; i++) { |
| 250 | if (XFS_INOBT_MASK(i) & ~irec->ir_free) |
| 251 | irec->ir_freecount++; |
| 252 | } |
| 253 | |
| 254 | irec->ir_free |= xfs_inobt_maskn(0, idx); |
| 255 | *icount = XFS_INODES_PER_CHUNK - irec->ir_freecount; |
| 256 | } |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | #define XFS_BULKSTAT_UBLEFT(ubleft) ((ubleft) >= statstruct_size) |
| 262 | |
| 263 | struct xfs_bulkstat_agichunk { |
| 264 | char __user **ac_ubuffer;/* pointer into user's buffer */ |
| 265 | int ac_ubleft; /* bytes left in user's buffer */ |
| 266 | int ac_ubelem; /* spaces used in user's buffer */ |
| 267 | }; |
| 268 | |
| 269 | /* |
| 270 | * Process inodes in chunk with a pointer to a formatter function |
| 271 | * that will iget the inode and fill in the appropriate structure. |
| 272 | */ |
| 273 | static int |
| 274 | xfs_bulkstat_ag_ichunk( |
| 275 | struct xfs_mount *mp, |
| 276 | xfs_agnumber_t agno, |
| 277 | struct xfs_inobt_rec_incore *irbp, |
| 278 | bulkstat_one_pf formatter, |
| 279 | size_t statstruct_size, |
| 280 | struct xfs_bulkstat_agichunk *acp, |
| 281 | xfs_agino_t *last_agino) |
| 282 | { |
| 283 | char __user **ubufp = acp->ac_ubuffer; |
| 284 | int chunkidx; |
| 285 | int error = 0; |
| 286 | xfs_agino_t agino = irbp->ir_startino; |
| 287 | |
| 288 | for (chunkidx = 0; chunkidx < XFS_INODES_PER_CHUNK; |
| 289 | chunkidx++, agino++) { |
| 290 | int fmterror; |
| 291 | int ubused; |
| 292 | |
| 293 | /* inode won't fit in buffer, we are done */ |
| 294 | if (acp->ac_ubleft < statstruct_size) |
| 295 | break; |
| 296 | |
| 297 | /* Skip if this inode is free */ |
| 298 | if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) |
| 299 | continue; |
| 300 | |
| 301 | /* Get the inode and fill in a single buffer */ |
| 302 | ubused = statstruct_size; |
| 303 | error = formatter(mp, XFS_AGINO_TO_INO(mp, agno, agino), |
| 304 | *ubufp, acp->ac_ubleft, &ubused, &fmterror); |
| 305 | |
| 306 | if (fmterror == BULKSTAT_RV_GIVEUP || |
| 307 | (error && error != -ENOENT && error != -EINVAL)) { |
| 308 | acp->ac_ubleft = 0; |
| 309 | ASSERT(error); |
| 310 | break; |
| 311 | } |
| 312 | |
| 313 | /* be careful not to leak error if at end of chunk */ |
| 314 | if (fmterror == BULKSTAT_RV_NOTHING || error) { |
| 315 | error = 0; |
| 316 | continue; |
| 317 | } |
| 318 | |
| 319 | *ubufp += ubused; |
| 320 | acp->ac_ubleft -= ubused; |
| 321 | acp->ac_ubelem++; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Post-update *last_agino. At this point, agino will always point one |
| 326 | * inode past the last inode we processed successfully. Hence we |
| 327 | * substract that inode when setting the *last_agino cursor so that we |
| 328 | * return the correct cookie to userspace. On the next bulkstat call, |
| 329 | * the inode under the lastino cookie will be skipped as we have already |
| 330 | * processed it here. |
| 331 | */ |
| 332 | *last_agino = agino - 1; |
| 333 | |
| 334 | return error; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Return stat information in bulk (by-inode) for the filesystem. |
| 339 | */ |
| 340 | int /* error status */ |
| 341 | xfs_bulkstat( |
| 342 | xfs_mount_t *mp, /* mount point for filesystem */ |
| 343 | xfs_ino_t *lastinop, /* last inode returned */ |
| 344 | int *ubcountp, /* size of buffer/count returned */ |
| 345 | bulkstat_one_pf formatter, /* func that'd fill a single buf */ |
| 346 | size_t statstruct_size, /* sizeof struct filling */ |
| 347 | char __user *ubuffer, /* buffer with inode stats */ |
| 348 | int *done) /* 1 if there are more stats to get */ |
| 349 | { |
| 350 | xfs_buf_t *agbp; /* agi header buffer */ |
| 351 | xfs_agino_t agino; /* inode # in allocation group */ |
| 352 | xfs_agnumber_t agno; /* allocation group number */ |
| 353 | xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */ |
| 354 | size_t irbsize; /* size of irec buffer in bytes */ |
| 355 | xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */ |
| 356 | int nirbuf; /* size of irbuf */ |
| 357 | int ubcount; /* size of user's buffer */ |
| 358 | struct xfs_bulkstat_agichunk ac; |
| 359 | int error = 0; |
| 360 | |
| 361 | /* |
| 362 | * Get the last inode value, see if there's nothing to do. |
| 363 | */ |
| 364 | agno = XFS_INO_TO_AGNO(mp, *lastinop); |
| 365 | agino = XFS_INO_TO_AGINO(mp, *lastinop); |
| 366 | if (agno >= mp->m_sb.sb_agcount || |
| 367 | *lastinop != XFS_AGINO_TO_INO(mp, agno, agino)) { |
| 368 | *done = 1; |
| 369 | *ubcountp = 0; |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | ubcount = *ubcountp; /* statstruct's */ |
| 374 | ac.ac_ubuffer = &ubuffer; |
| 375 | ac.ac_ubleft = ubcount * statstruct_size; /* bytes */; |
| 376 | ac.ac_ubelem = 0; |
| 377 | |
| 378 | *ubcountp = 0; |
| 379 | *done = 0; |
| 380 | |
| 381 | irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4); |
| 382 | if (!irbuf) |
| 383 | return -ENOMEM; |
| 384 | |
| 385 | nirbuf = irbsize / sizeof(*irbuf); |
| 386 | |
| 387 | /* |
| 388 | * Loop over the allocation groups, starting from the last |
| 389 | * inode returned; 0 means start of the allocation group. |
| 390 | */ |
| 391 | while (agno < mp->m_sb.sb_agcount) { |
| 392 | struct xfs_inobt_rec_incore *irbp = irbuf; |
| 393 | struct xfs_inobt_rec_incore *irbufend = irbuf + nirbuf; |
| 394 | bool end_of_ag = false; |
| 395 | int icount = 0; |
| 396 | int stat; |
| 397 | |
| 398 | error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp); |
| 399 | if (error) |
| 400 | break; |
| 401 | /* |
| 402 | * Allocate and initialize a btree cursor for ialloc btree. |
| 403 | */ |
| 404 | cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno, |
| 405 | XFS_BTNUM_INO); |
| 406 | if (agino > 0) { |
| 407 | /* |
| 408 | * In the middle of an allocation group, we need to get |
| 409 | * the remainder of the chunk we're in. |
| 410 | */ |
| 411 | struct xfs_inobt_rec_incore r; |
| 412 | |
| 413 | error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r); |
| 414 | if (error) |
| 415 | goto del_cursor; |
| 416 | if (icount) { |
| 417 | irbp->ir_startino = r.ir_startino; |
| 418 | irbp->ir_freecount = r.ir_freecount; |
| 419 | irbp->ir_free = r.ir_free; |
| 420 | irbp++; |
| 421 | } |
| 422 | /* Increment to the next record */ |
| 423 | error = xfs_btree_increment(cur, 0, &stat); |
| 424 | } else { |
| 425 | /* Start of ag. Lookup the first inode chunk */ |
| 426 | error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &stat); |
| 427 | } |
| 428 | if (error || stat == 0) { |
| 429 | end_of_ag = true; |
| 430 | goto del_cursor; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Loop through inode btree records in this ag, |
| 435 | * until we run out of inodes or space in the buffer. |
| 436 | */ |
| 437 | while (irbp < irbufend && icount < ubcount) { |
| 438 | struct xfs_inobt_rec_incore r; |
| 439 | |
| 440 | error = xfs_inobt_get_rec(cur, &r, &stat); |
| 441 | if (error || stat == 0) { |
| 442 | end_of_ag = true; |
| 443 | goto del_cursor; |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * If this chunk has any allocated inodes, save it. |
| 448 | * Also start read-ahead now for this chunk. |
| 449 | */ |
| 450 | if (r.ir_freecount < XFS_INODES_PER_CHUNK) { |
| 451 | xfs_bulkstat_ichunk_ra(mp, agno, &r); |
| 452 | irbp->ir_startino = r.ir_startino; |
| 453 | irbp->ir_freecount = r.ir_freecount; |
| 454 | irbp->ir_free = r.ir_free; |
| 455 | irbp++; |
| 456 | icount += XFS_INODES_PER_CHUNK - r.ir_freecount; |
| 457 | } |
| 458 | error = xfs_btree_increment(cur, 0, &stat); |
| 459 | if (error || stat == 0) { |
| 460 | end_of_ag = true; |
| 461 | goto del_cursor; |
| 462 | } |
| 463 | cond_resched(); |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Drop the btree buffers and the agi buffer as we can't hold any |
| 468 | * of the locks these represent when calling iget. If there is a |
| 469 | * pending error, then we are done. |
| 470 | */ |
| 471 | del_cursor: |
| 472 | xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| 473 | xfs_buf_relse(agbp); |
| 474 | if (error) |
| 475 | break; |
| 476 | /* |
| 477 | * Now format all the good inodes into the user's buffer. The |
| 478 | * call to xfs_bulkstat_ag_ichunk() sets up the agino pointer |
| 479 | * for the next loop iteration. |
| 480 | */ |
| 481 | irbufend = irbp; |
| 482 | for (irbp = irbuf; |
| 483 | irbp < irbufend && ac.ac_ubleft >= statstruct_size; |
| 484 | irbp++) { |
| 485 | error = xfs_bulkstat_ag_ichunk(mp, agno, irbp, |
| 486 | formatter, statstruct_size, &ac, |
| 487 | &agino); |
| 488 | if (error) |
| 489 | break; |
| 490 | |
| 491 | cond_resched(); |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * If we've run out of space or had a formatting error, we |
| 496 | * are now done |
| 497 | */ |
| 498 | if (ac.ac_ubleft < statstruct_size || error) |
| 499 | break; |
| 500 | |
| 501 | if (end_of_ag) { |
| 502 | agno++; |
| 503 | agino = 0; |
| 504 | } |
| 505 | } |
| 506 | /* |
| 507 | * Done, we're either out of filesystem or space to put the data. |
| 508 | */ |
| 509 | kmem_free(irbuf); |
| 510 | *ubcountp = ac.ac_ubelem; |
| 511 | |
| 512 | /* |
| 513 | * We found some inodes, so clear the error status and return them. |
| 514 | * The lastino pointer will point directly at the inode that triggered |
| 515 | * any error that occurred, so on the next call the error will be |
| 516 | * triggered again and propagated to userspace as there will be no |
| 517 | * formatted inodes in the buffer. |
| 518 | */ |
| 519 | if (ac.ac_ubelem) |
| 520 | error = 0; |
| 521 | |
| 522 | /* |
| 523 | * If we ran out of filesystem, lastino will point off the end of |
| 524 | * the filesystem so the next call will return immediately. |
| 525 | */ |
| 526 | *lastinop = XFS_AGINO_TO_INO(mp, agno, agino); |
| 527 | if (agno >= mp->m_sb.sb_agcount) |
| 528 | *done = 1; |
| 529 | |
| 530 | return error; |
| 531 | } |
| 532 | |
| 533 | int |
| 534 | xfs_inumbers_fmt( |
| 535 | void __user *ubuffer, /* buffer to write to */ |
| 536 | const struct xfs_inogrp *buffer, /* buffer to read from */ |
| 537 | long count, /* # of elements to read */ |
| 538 | long *written) /* # of bytes written */ |
| 539 | { |
| 540 | if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer))) |
| 541 | return -EFAULT; |
| 542 | *written = count * sizeof(*buffer); |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Return inode number table for the filesystem. |
| 548 | */ |
| 549 | int /* error status */ |
| 550 | xfs_inumbers( |
| 551 | struct xfs_mount *mp,/* mount point for filesystem */ |
| 552 | xfs_ino_t *lastino,/* last inode returned */ |
| 553 | int *count,/* size of buffer/count returned */ |
| 554 | void __user *ubuffer,/* buffer with inode descriptions */ |
| 555 | inumbers_fmt_pf formatter) |
| 556 | { |
| 557 | xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, *lastino); |
| 558 | xfs_agino_t agino = XFS_INO_TO_AGINO(mp, *lastino); |
| 559 | struct xfs_btree_cur *cur = NULL; |
| 560 | struct xfs_buf *agbp = NULL; |
| 561 | struct xfs_inogrp *buffer; |
| 562 | int bcount; |
| 563 | int left = *count; |
| 564 | int bufidx = 0; |
| 565 | int error = 0; |
| 566 | |
| 567 | *count = 0; |
| 568 | if (agno >= mp->m_sb.sb_agcount || |
| 569 | *lastino != XFS_AGINO_TO_INO(mp, agno, agino)) |
| 570 | return error; |
| 571 | |
| 572 | bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer))); |
| 573 | buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP); |
| 574 | do { |
| 575 | struct xfs_inobt_rec_incore r; |
| 576 | int stat; |
| 577 | |
| 578 | if (!agbp) { |
| 579 | error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp); |
| 580 | if (error) |
| 581 | break; |
| 582 | |
| 583 | cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno, |
| 584 | XFS_BTNUM_INO); |
| 585 | error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE, |
| 586 | &stat); |
| 587 | if (error) |
| 588 | break; |
| 589 | if (!stat) |
| 590 | goto next_ag; |
| 591 | } |
| 592 | |
| 593 | error = xfs_inobt_get_rec(cur, &r, &stat); |
| 594 | if (error) |
| 595 | break; |
| 596 | if (!stat) |
| 597 | goto next_ag; |
| 598 | |
| 599 | agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1; |
| 600 | buffer[bufidx].xi_startino = |
| 601 | XFS_AGINO_TO_INO(mp, agno, r.ir_startino); |
| 602 | buffer[bufidx].xi_alloccount = |
| 603 | XFS_INODES_PER_CHUNK - r.ir_freecount; |
| 604 | buffer[bufidx].xi_allocmask = ~r.ir_free; |
| 605 | if (++bufidx == bcount) { |
| 606 | long written; |
| 607 | |
| 608 | error = formatter(ubuffer, buffer, bufidx, &written); |
| 609 | if (error) |
| 610 | break; |
| 611 | ubuffer += written; |
| 612 | *count += bufidx; |
| 613 | bufidx = 0; |
| 614 | } |
| 615 | if (!--left) |
| 616 | break; |
| 617 | |
| 618 | error = xfs_btree_increment(cur, 0, &stat); |
| 619 | if (error) |
| 620 | break; |
| 621 | if (stat) |
| 622 | continue; |
| 623 | |
| 624 | next_ag: |
| 625 | xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| 626 | cur = NULL; |
| 627 | xfs_buf_relse(agbp); |
| 628 | agbp = NULL; |
| 629 | agino = 0; |
| 630 | agno++; |
| 631 | } while (agno < mp->m_sb.sb_agcount); |
| 632 | |
| 633 | if (!error) { |
| 634 | if (bufidx) { |
| 635 | long written; |
| 636 | |
| 637 | error = formatter(ubuffer, buffer, bufidx, &written); |
| 638 | if (!error) |
| 639 | *count += bufidx; |
| 640 | } |
| 641 | *lastino = XFS_AGINO_TO_INO(mp, agno, agino); |
| 642 | } |
| 643 | |
| 644 | kmem_free(buffer); |
| 645 | if (cur) |
| 646 | xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR : |
| 647 | XFS_BTREE_NOERROR)); |
| 648 | if (agbp) |
| 649 | xfs_buf_relse(agbp); |
| 650 | |
| 651 | return error; |
| 652 | } |