1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/namei.h> 15 #include <linux/mm.h> 16 #include <linux/xattr.h> 17 #include <linux/posix_acl.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/crc32.h> 20 #include <linux/fiemap.h> 21 #include <linux/security.h> 22 #include <asm/uaccess.h> 23 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "acl.h" 27 #include "bmap.h" 28 #include "dir.h" 29 #include "xattr.h" 30 #include "glock.h" 31 #include "inode.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 #include "super.h" 38 #include "glops.h" 39 40 struct gfs2_skip_data { 41 u64 no_addr; 42 int skipped; 43 int non_block; 44 }; 45 46 static int iget_test(struct inode *inode, void *opaque) 47 { 48 struct gfs2_inode *ip = GFS2_I(inode); 49 struct gfs2_skip_data *data = opaque; 50 51 if (ip->i_no_addr == data->no_addr) { 52 if (data->non_block && 53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { 54 data->skipped = 1; 55 return 0; 56 } 57 return 1; 58 } 59 return 0; 60 } 61 62 static int iget_set(struct inode *inode, void *opaque) 63 { 64 struct gfs2_inode *ip = GFS2_I(inode); 65 struct gfs2_skip_data *data = opaque; 66 67 if (data->skipped) 68 return -ENOENT; 69 inode->i_ino = (unsigned long)(data->no_addr); 70 ip->i_no_addr = data->no_addr; 71 return 0; 72 } 73 74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) 75 { 76 unsigned long hash = (unsigned long)no_addr; 77 struct gfs2_skip_data data; 78 79 data.no_addr = no_addr; 80 data.skipped = 0; 81 data.non_block = non_block; 82 return ilookup5(sb, hash, iget_test, &data); 83 } 84 85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, 86 int non_block) 87 { 88 struct gfs2_skip_data data; 89 unsigned long hash = (unsigned long)no_addr; 90 91 data.no_addr = no_addr; 92 data.skipped = 0; 93 data.non_block = non_block; 94 return iget5_locked(sb, hash, iget_test, iget_set, &data); 95 } 96 97 /** 98 * gfs2_set_iop - Sets inode operations 99 * @inode: The inode with correct i_mode filled in 100 * 101 * GFS2 lookup code fills in vfs inode contents based on info obtained 102 * from directory entry inside gfs2_inode_lookup(). 103 */ 104 105 static void gfs2_set_iop(struct inode *inode) 106 { 107 struct gfs2_sbd *sdp = GFS2_SB(inode); 108 umode_t mode = inode->i_mode; 109 110 if (S_ISREG(mode)) { 111 inode->i_op = &gfs2_file_iops; 112 if (gfs2_localflocks(sdp)) 113 inode->i_fop = &gfs2_file_fops_nolock; 114 else 115 inode->i_fop = &gfs2_file_fops; 116 } else if (S_ISDIR(mode)) { 117 inode->i_op = &gfs2_dir_iops; 118 if (gfs2_localflocks(sdp)) 119 inode->i_fop = &gfs2_dir_fops_nolock; 120 else 121 inode->i_fop = &gfs2_dir_fops; 122 } else if (S_ISLNK(mode)) { 123 inode->i_op = &gfs2_symlink_iops; 124 } else { 125 inode->i_op = &gfs2_file_iops; 126 init_special_inode(inode, inode->i_mode, inode->i_rdev); 127 } 128 } 129 130 /** 131 * gfs2_inode_lookup - Lookup an inode 132 * @sb: The super block 133 * @no_addr: The inode number 134 * @type: The type of the inode 135 * non_block: Can we block on inodes that are being freed? 136 * 137 * Returns: A VFS inode, or an error 138 */ 139 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 141 u64 no_addr, u64 no_formal_ino, int non_block) 142 { 143 struct inode *inode; 144 struct gfs2_inode *ip; 145 struct gfs2_glock *io_gl = NULL; 146 int error; 147 148 inode = gfs2_iget(sb, no_addr, non_block); 149 ip = GFS2_I(inode); 150 151 if (!inode) 152 return ERR_PTR(-ENOBUFS); 153 154 if (inode->i_state & I_NEW) { 155 struct gfs2_sbd *sdp = GFS2_SB(inode); 156 ip->i_no_formal_ino = no_formal_ino; 157 158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 159 if (unlikely(error)) 160 goto fail; 161 ip->i_gl->gl_object = ip; 162 163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 164 if (unlikely(error)) 165 goto fail_put; 166 167 set_bit(GIF_INVALID, &ip->i_flags); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 169 if (unlikely(error)) 170 goto fail_iopen; 171 172 ip->i_iopen_gh.gh_gl->gl_object = ip; 173 gfs2_glock_put(io_gl); 174 io_gl = NULL; 175 176 if (type == DT_UNKNOWN) { 177 /* Inode glock must be locked already */ 178 error = gfs2_inode_refresh(GFS2_I(inode)); 179 if (error) 180 goto fail_refresh; 181 } else { 182 inode->i_mode = DT2IF(type); 183 } 184 185 gfs2_set_iop(inode); 186 unlock_new_inode(inode); 187 } 188 189 return inode; 190 191 fail_refresh: 192 ip->i_iopen_gh.gh_gl->gl_object = NULL; 193 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 194 fail_iopen: 195 if (io_gl) 196 gfs2_glock_put(io_gl); 197 fail_put: 198 ip->i_gl->gl_object = NULL; 199 gfs2_glock_put(ip->i_gl); 200 fail: 201 iget_failed(inode); 202 return ERR_PTR(error); 203 } 204 205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 206 u64 *no_formal_ino, unsigned int blktype) 207 { 208 struct super_block *sb = sdp->sd_vfs; 209 struct gfs2_holder i_gh; 210 struct inode *inode = NULL; 211 int error; 212 213 /* Must not read in block until block type is verified */ 214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 216 if (error) 217 return ERR_PTR(error); 218 219 error = gfs2_check_blk_type(sdp, no_addr, blktype); 220 if (error) 221 goto fail; 222 223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 224 if (IS_ERR(inode)) 225 goto fail; 226 227 /* Two extra checks for NFS only */ 228 if (no_formal_ino) { 229 error = -ESTALE; 230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 231 goto fail_iput; 232 233 error = -EIO; 234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 235 goto fail_iput; 236 237 error = 0; 238 } 239 240 fail: 241 gfs2_glock_dq_uninit(&i_gh); 242 return error ? ERR_PTR(error) : inode; 243 fail_iput: 244 iput(inode); 245 goto fail; 246 } 247 248 249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 250 { 251 struct qstr qstr; 252 struct inode *inode; 253 gfs2_str2qstr(&qstr, name); 254 inode = gfs2_lookupi(dip, &qstr, 1); 255 /* gfs2_lookupi has inconsistent callers: vfs 256 * related routines expect NULL for no entry found, 257 * gfs2_lookup_simple callers expect ENOENT 258 * and do not check for NULL. 259 */ 260 if (inode == NULL) 261 return ERR_PTR(-ENOENT); 262 else 263 return inode; 264 } 265 266 267 /** 268 * gfs2_lookupi - Look up a filename in a directory and return its inode 269 * @d_gh: An initialized holder for the directory glock 270 * @name: The name of the inode to look for 271 * @is_root: If 1, ignore the caller's permissions 272 * @i_gh: An uninitialized holder for the new inode glock 273 * 274 * This can be called via the VFS filldir function when NFS is doing 275 * a readdirplus and the inode which its intending to stat isn't 276 * already in cache. In this case we must not take the directory glock 277 * again, since the readdir call will have already taken that lock. 278 * 279 * Returns: errno 280 */ 281 282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 283 int is_root) 284 { 285 struct super_block *sb = dir->i_sb; 286 struct gfs2_inode *dip = GFS2_I(dir); 287 struct gfs2_holder d_gh; 288 int error = 0; 289 struct inode *inode = NULL; 290 int unlock = 0; 291 292 if (!name->len || name->len > GFS2_FNAMESIZE) 293 return ERR_PTR(-ENAMETOOLONG); 294 295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 297 dir == sb->s_root->d_inode)) { 298 igrab(dir); 299 return dir; 300 } 301 302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 304 if (error) 305 return ERR_PTR(error); 306 unlock = 1; 307 } 308 309 if (!is_root) { 310 error = gfs2_permission(dir, MAY_EXEC); 311 if (error) 312 goto out; 313 } 314 315 inode = gfs2_dir_search(dir, name); 316 if (IS_ERR(inode)) 317 error = PTR_ERR(inode); 318 out: 319 if (unlock) 320 gfs2_glock_dq_uninit(&d_gh); 321 if (error == -ENOENT) 322 return NULL; 323 return inode ? inode : ERR_PTR(error); 324 } 325 326 /** 327 * create_ok - OK to create a new on-disk inode here? 328 * @dip: Directory in which dinode is to be created 329 * @name: Name of new dinode 330 * @mode: 331 * 332 * Returns: errno 333 */ 334 335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 336 unsigned int mode) 337 { 338 int error; 339 340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 341 if (error) 342 return error; 343 344 /* Don't create entries in an unlinked directory */ 345 if (!dip->i_inode.i_nlink) 346 return -ENOENT; 347 348 error = gfs2_dir_check(&dip->i_inode, name, NULL); 349 switch (error) { 350 case -ENOENT: 351 error = 0; 352 break; 353 case 0: 354 return -EEXIST; 355 default: 356 return error; 357 } 358 359 if (dip->i_entries == (u32)-1) 360 return -EFBIG; 361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 362 return -EMLINK; 363 364 return 0; 365 } 366 367 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, 368 unsigned int *uid, unsigned int *gid) 369 { 370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { 372 if (S_ISDIR(*mode)) 373 *mode |= S_ISUID; 374 else if (dip->i_inode.i_uid != current_fsuid()) 375 *mode &= ~07111; 376 *uid = dip->i_inode.i_uid; 377 } else 378 *uid = current_fsuid(); 379 380 if (dip->i_inode.i_mode & S_ISGID) { 381 if (S_ISDIR(*mode)) 382 *mode |= S_ISGID; 383 *gid = dip->i_inode.i_gid; 384 } else 385 *gid = current_fsgid(); 386 } 387 388 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) 389 { 390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 391 int error; 392 393 if (gfs2_alloc_get(dip) == NULL) 394 return -ENOMEM; 395 396 dip->i_alloc->al_requested = RES_DINODE; 397 error = gfs2_inplace_reserve(dip); 398 if (error) 399 goto out; 400 401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 402 if (error) 403 goto out_ipreserv; 404 405 error = gfs2_alloc_di(dip, no_addr, generation); 406 407 gfs2_trans_end(sdp); 408 409 out_ipreserv: 410 gfs2_inplace_release(dip); 411 out: 412 gfs2_alloc_put(dip); 413 return error; 414 } 415 416 static void gfs2_init_dir(struct buffer_head *dibh, 417 const struct gfs2_inode *parent) 418 { 419 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 420 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 421 422 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 423 dent->de_inum = di->di_num; /* already GFS2 endian */ 424 dent->de_type = cpu_to_be16(DT_DIR); 425 426 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 427 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 428 gfs2_inum_out(parent, dent); 429 dent->de_type = cpu_to_be16(DT_DIR); 430 431 } 432 433 /** 434 * init_dinode - Fill in a new dinode structure 435 * @dip: The directory this inode is being created in 436 * @gl: The glock covering the new inode 437 * @inum: The inode number 438 * @mode: The file permissions 439 * @uid: The uid of the new inode 440 * @gid: The gid of the new inode 441 * @generation: The generation number of the new inode 442 * @dev: The device number (if a device node) 443 * @symname: The symlink destination (if a symlink) 444 * @size: The inode size (ignored for directories) 445 * @bhp: The buffer head (returned to caller) 446 * 447 */ 448 449 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 450 const struct gfs2_inum_host *inum, unsigned int mode, 451 unsigned int uid, unsigned int gid, 452 const u64 *generation, dev_t dev, const char *symname, 453 unsigned size, struct buffer_head **bhp) 454 { 455 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 456 struct gfs2_dinode *di; 457 struct buffer_head *dibh; 458 struct timespec tv = CURRENT_TIME; 459 460 dibh = gfs2_meta_new(gl, inum->no_addr); 461 gfs2_trans_add_bh(gl, dibh, 1); 462 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 463 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 464 di = (struct gfs2_dinode *)dibh->b_data; 465 466 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 467 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 468 di->di_mode = cpu_to_be32(mode); 469 di->di_uid = cpu_to_be32(uid); 470 di->di_gid = cpu_to_be32(gid); 471 di->di_nlink = 0; 472 di->di_size = cpu_to_be64(size); 473 di->di_blocks = cpu_to_be64(1); 474 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); 475 di->di_major = cpu_to_be32(MAJOR(dev)); 476 di->di_minor = cpu_to_be32(MINOR(dev)); 477 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 478 di->di_generation = cpu_to_be64(*generation); 479 di->di_flags = 0; 480 di->__pad1 = 0; 481 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); 482 di->di_height = 0; 483 di->__pad2 = 0; 484 di->__pad3 = 0; 485 di->di_depth = 0; 486 di->di_entries = 0; 487 memset(&di->__pad4, 0, sizeof(di->__pad4)); 488 di->di_eattr = 0; 489 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); 490 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); 491 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); 492 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 493 494 switch(mode & S_IFMT) { 495 case S_IFREG: 496 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 497 gfs2_tune_get(sdp, gt_new_files_jdata)) 498 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 499 break; 500 case S_IFDIR: 501 di->di_flags |= cpu_to_be32(dip->i_diskflags & 502 GFS2_DIF_INHERIT_JDATA); 503 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 504 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); 505 di->di_entries = cpu_to_be32(2); 506 gfs2_init_dir(dibh, dip); 507 break; 508 case S_IFLNK: 509 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size); 510 break; 511 } 512 513 set_buffer_uptodate(dibh); 514 515 *bhp = dibh; 516 } 517 518 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 519 unsigned int mode, const struct gfs2_inum_host *inum, 520 const u64 *generation, dev_t dev, const char *symname, 521 unsigned int size, struct buffer_head **bhp) 522 { 523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 524 unsigned int uid, gid; 525 int error; 526 527 munge_mode_uid_gid(dip, &mode, &uid, &gid); 528 if (!gfs2_alloc_get(dip)) 529 return -ENOMEM; 530 531 error = gfs2_quota_lock(dip, uid, gid); 532 if (error) 533 goto out; 534 535 error = gfs2_quota_check(dip, uid, gid); 536 if (error) 537 goto out_quota; 538 539 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 540 if (error) 541 goto out_quota; 542 543 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp); 544 gfs2_quota_change(dip, +1, uid, gid); 545 gfs2_trans_end(sdp); 546 547 out_quota: 548 gfs2_quota_unlock(dip); 549 out: 550 gfs2_alloc_put(dip); 551 return error; 552 } 553 554 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 555 struct gfs2_inode *ip) 556 { 557 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 558 struct gfs2_alloc *al; 559 int alloc_required; 560 struct buffer_head *dibh; 561 int error; 562 563 al = gfs2_alloc_get(dip); 564 if (!al) 565 return -ENOMEM; 566 567 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 568 if (error) 569 goto fail; 570 571 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 572 if (alloc_required < 0) 573 goto fail_quota_locks; 574 if (alloc_required) { 575 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); 576 if (error) 577 goto fail_quota_locks; 578 579 al->al_requested = sdp->sd_max_dirres; 580 581 error = gfs2_inplace_reserve(dip); 582 if (error) 583 goto fail_quota_locks; 584 585 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 586 al->al_rgd->rd_length + 587 2 * RES_DINODE + 588 RES_STATFS + RES_QUOTA, 0); 589 if (error) 590 goto fail_ipreserv; 591 } else { 592 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 593 if (error) 594 goto fail_quota_locks; 595 } 596 597 error = gfs2_dir_add(&dip->i_inode, name, ip); 598 if (error) 599 goto fail_end_trans; 600 601 error = gfs2_meta_inode_buffer(ip, &dibh); 602 if (error) 603 goto fail_end_trans; 604 inc_nlink(&ip->i_inode); 605 if (S_ISDIR(ip->i_inode.i_mode)) 606 inc_nlink(&ip->i_inode); 607 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 608 gfs2_dinode_out(ip, dibh->b_data); 609 brelse(dibh); 610 return 0; 611 612 fail_end_trans: 613 gfs2_trans_end(sdp); 614 615 fail_ipreserv: 616 if (dip->i_alloc->al_rgd) 617 gfs2_inplace_release(dip); 618 619 fail_quota_locks: 620 gfs2_quota_unlock(dip); 621 622 fail: 623 gfs2_alloc_put(dip); 624 return error; 625 } 626 627 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 628 const struct qstr *qstr) 629 { 630 int err; 631 size_t len; 632 void *value; 633 char *name; 634 635 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 636 &name, &value, &len); 637 638 if (err) { 639 if (err == -EOPNOTSUPP) 640 return 0; 641 return err; 642 } 643 644 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0, 645 GFS2_EATYPE_SECURITY); 646 kfree(value); 647 kfree(name); 648 649 return err; 650 } 651 652 /** 653 * gfs2_create_inode - Create a new inode 654 * @dir: The parent directory 655 * @dentry: The new dentry 656 * @mode: The permissions on the new inode 657 * @dev: For device nodes, this is the device number 658 * @symname: For symlinks, this is the link destination 659 * @size: The initial size of the inode (ignored for directories) 660 * 661 * Returns: 0 on success, or error code 662 */ 663 664 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 665 unsigned int mode, dev_t dev, const char *symname, 666 unsigned int size) 667 { 668 const struct qstr *name = &dentry->d_name; 669 struct gfs2_holder ghs[2]; 670 struct inode *inode = NULL; 671 struct gfs2_inode *dip = GFS2_I(dir); 672 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 673 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; 674 int error; 675 u64 generation; 676 struct buffer_head *bh = NULL; 677 678 if (!name->len || name->len > GFS2_FNAMESIZE) 679 return -ENAMETOOLONG; 680 681 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 682 if (error) 683 goto fail; 684 685 error = create_ok(dip, name, mode); 686 if (error) 687 goto fail_gunlock; 688 689 error = alloc_dinode(dip, &inum.no_addr, &generation); 690 if (error) 691 goto fail_gunlock; 692 inum.no_formal_ino = generation; 693 694 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, 695 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 696 if (error) 697 goto fail_gunlock; 698 699 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh); 700 if (error) 701 goto fail_gunlock2; 702 703 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, 704 inum.no_formal_ino, 0); 705 if (IS_ERR(inode)) 706 goto fail_gunlock2; 707 708 error = gfs2_inode_refresh(GFS2_I(inode)); 709 if (error) 710 goto fail_gunlock2; 711 712 error = gfs2_acl_create(dip, inode); 713 if (error) 714 goto fail_gunlock2; 715 716 error = gfs2_security_init(dip, GFS2_I(inode), name); 717 if (error) 718 goto fail_gunlock2; 719 720 error = link_dinode(dip, name, GFS2_I(inode)); 721 if (error) 722 goto fail_gunlock2; 723 724 if (bh) 725 brelse(bh); 726 727 gfs2_trans_end(sdp); 728 if (dip->i_alloc->al_rgd) 729 gfs2_inplace_release(dip); 730 gfs2_quota_unlock(dip); 731 gfs2_alloc_put(dip); 732 gfs2_glock_dq_uninit_m(2, ghs); 733 mark_inode_dirty(inode); 734 d_instantiate(dentry, inode); 735 return 0; 736 737 fail_gunlock2: 738 gfs2_glock_dq_uninit(ghs + 1); 739 if (inode && !IS_ERR(inode)) 740 iput(inode); 741 fail_gunlock: 742 gfs2_glock_dq_uninit(ghs); 743 fail: 744 if (bh) 745 brelse(bh); 746 return error; 747 } 748 749 /** 750 * gfs2_create - Create a file 751 * @dir: The directory in which to create the file 752 * @dentry: The dentry of the new file 753 * @mode: The mode of the new file 754 * 755 * Returns: errno 756 */ 757 758 static int gfs2_create(struct inode *dir, struct dentry *dentry, 759 int mode, struct nameidata *nd) 760 { 761 struct inode *inode; 762 int ret; 763 764 for (;;) { 765 ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0); 766 if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL))) 767 return ret; 768 769 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 770 if (inode) { 771 if (!IS_ERR(inode)) 772 break; 773 return PTR_ERR(inode); 774 } 775 } 776 777 d_instantiate(dentry, inode); 778 return 0; 779 } 780 781 /** 782 * gfs2_lookup - Look up a filename in a directory and return its inode 783 * @dir: The directory inode 784 * @dentry: The dentry of the new inode 785 * @nd: passed from Linux VFS, ignored by us 786 * 787 * Called by the VFS layer. Lock dir and call gfs2_lookupi() 788 * 789 * Returns: errno 790 */ 791 792 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 793 struct nameidata *nd) 794 { 795 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); 796 if (inode && !IS_ERR(inode)) { 797 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 798 struct gfs2_holder gh; 799 int error; 800 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 801 if (error) { 802 iput(inode); 803 return ERR_PTR(error); 804 } 805 gfs2_glock_dq_uninit(&gh); 806 } 807 return d_splice_alias(inode, dentry); 808 } 809 810 /** 811 * gfs2_link - Link to a file 812 * @old_dentry: The inode to link 813 * @dir: Add link to this directory 814 * @dentry: The name of the link 815 * 816 * Link the inode in "old_dentry" into the directory "dir" with the 817 * name in "dentry". 818 * 819 * Returns: errno 820 */ 821 822 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 823 struct dentry *dentry) 824 { 825 struct gfs2_inode *dip = GFS2_I(dir); 826 struct gfs2_sbd *sdp = GFS2_SB(dir); 827 struct inode *inode = old_dentry->d_inode; 828 struct gfs2_inode *ip = GFS2_I(inode); 829 struct gfs2_holder ghs[2]; 830 struct buffer_head *dibh; 831 int alloc_required; 832 int error; 833 834 if (S_ISDIR(inode->i_mode)) 835 return -EPERM; 836 837 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 838 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 839 840 error = gfs2_glock_nq(ghs); /* parent */ 841 if (error) 842 goto out_parent; 843 844 error = gfs2_glock_nq(ghs + 1); /* child */ 845 if (error) 846 goto out_child; 847 848 error = -ENOENT; 849 if (inode->i_nlink == 0) 850 goto out_gunlock; 851 852 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 853 if (error) 854 goto out_gunlock; 855 856 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 857 switch (error) { 858 case -ENOENT: 859 break; 860 case 0: 861 error = -EEXIST; 862 default: 863 goto out_gunlock; 864 } 865 866 error = -EINVAL; 867 if (!dip->i_inode.i_nlink) 868 goto out_gunlock; 869 error = -EFBIG; 870 if (dip->i_entries == (u32)-1) 871 goto out_gunlock; 872 error = -EPERM; 873 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 874 goto out_gunlock; 875 error = -EINVAL; 876 if (!ip->i_inode.i_nlink) 877 goto out_gunlock; 878 error = -EMLINK; 879 if (ip->i_inode.i_nlink == (u32)-1) 880 goto out_gunlock; 881 882 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 883 if (error < 0) 884 goto out_gunlock; 885 error = 0; 886 887 if (alloc_required) { 888 struct gfs2_alloc *al = gfs2_alloc_get(dip); 889 if (!al) { 890 error = -ENOMEM; 891 goto out_gunlock; 892 } 893 894 error = gfs2_quota_lock_check(dip); 895 if (error) 896 goto out_alloc; 897 898 al->al_requested = sdp->sd_max_dirres; 899 900 error = gfs2_inplace_reserve(dip); 901 if (error) 902 goto out_gunlock_q; 903 904 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 905 gfs2_rg_blocks(al) + 906 2 * RES_DINODE + RES_STATFS + 907 RES_QUOTA, 0); 908 if (error) 909 goto out_ipres; 910 } else { 911 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 912 if (error) 913 goto out_ipres; 914 } 915 916 error = gfs2_meta_inode_buffer(ip, &dibh); 917 if (error) 918 goto out_end_trans; 919 920 error = gfs2_dir_add(dir, &dentry->d_name, ip); 921 if (error) 922 goto out_brelse; 923 924 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 925 inc_nlink(&ip->i_inode); 926 ip->i_inode.i_ctime = CURRENT_TIME; 927 gfs2_dinode_out(ip, dibh->b_data); 928 mark_inode_dirty(&ip->i_inode); 929 930 out_brelse: 931 brelse(dibh); 932 out_end_trans: 933 gfs2_trans_end(sdp); 934 out_ipres: 935 if (alloc_required) 936 gfs2_inplace_release(dip); 937 out_gunlock_q: 938 if (alloc_required) 939 gfs2_quota_unlock(dip); 940 out_alloc: 941 if (alloc_required) 942 gfs2_alloc_put(dip); 943 out_gunlock: 944 gfs2_glock_dq(ghs + 1); 945 out_child: 946 gfs2_glock_dq(ghs); 947 out_parent: 948 gfs2_holder_uninit(ghs); 949 gfs2_holder_uninit(ghs + 1); 950 if (!error) { 951 ihold(inode); 952 d_instantiate(dentry, inode); 953 mark_inode_dirty(inode); 954 } 955 return error; 956 } 957 958 /* 959 * gfs2_unlink_ok - check to see that a inode is still in a directory 960 * @dip: the directory 961 * @name: the name of the file 962 * @ip: the inode 963 * 964 * Assumes that the lock on (at least) @dip is held. 965 * 966 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 967 */ 968 969 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 970 const struct gfs2_inode *ip) 971 { 972 int error; 973 974 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 975 return -EPERM; 976 977 if ((dip->i_inode.i_mode & S_ISVTX) && 978 dip->i_inode.i_uid != current_fsuid() && 979 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) 980 return -EPERM; 981 982 if (IS_APPEND(&dip->i_inode)) 983 return -EPERM; 984 985 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 986 if (error) 987 return error; 988 989 error = gfs2_dir_check(&dip->i_inode, name, ip); 990 if (error) 991 return error; 992 993 return 0; 994 } 995 996 /** 997 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 998 * @dip: The parent directory 999 * @name: The name of the entry in the parent directory 1000 * @bh: The inode buffer for the inode to be removed 1001 * @inode: The inode to be removed 1002 * 1003 * Called with all the locks and in a transaction. This will only be 1004 * called for a directory after it has been checked to ensure it is empty. 1005 * 1006 * Returns: 0 on success, or an error 1007 */ 1008 1009 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1010 const struct dentry *dentry, 1011 struct buffer_head *bh) 1012 { 1013 struct inode *inode = dentry->d_inode; 1014 struct gfs2_inode *ip = GFS2_I(inode); 1015 int error; 1016 1017 error = gfs2_dir_del(dip, dentry); 1018 if (error) 1019 return error; 1020 1021 ip->i_entries = 0; 1022 inode->i_ctime = CURRENT_TIME; 1023 if (S_ISDIR(inode->i_mode)) 1024 clear_nlink(inode); 1025 else 1026 drop_nlink(inode); 1027 gfs2_trans_add_bh(ip->i_gl, bh, 1); 1028 gfs2_dinode_out(ip, bh->b_data); 1029 mark_inode_dirty(inode); 1030 if (inode->i_nlink == 0) 1031 gfs2_unlink_di(inode); 1032 return 0; 1033 } 1034 1035 1036 /** 1037 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1038 * @dir: The inode of the directory containing the inode to unlink 1039 * @dentry: The file itself 1040 * 1041 * This routine uses the type of the inode as a flag to figure out 1042 * whether this is an unlink or an rmdir. 1043 * 1044 * Returns: errno 1045 */ 1046 1047 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1048 { 1049 struct gfs2_inode *dip = GFS2_I(dir); 1050 struct gfs2_sbd *sdp = GFS2_SB(dir); 1051 struct inode *inode = dentry->d_inode; 1052 struct gfs2_inode *ip = GFS2_I(inode); 1053 struct buffer_head *bh; 1054 struct gfs2_holder ghs[3]; 1055 struct gfs2_rgrpd *rgd; 1056 struct gfs2_holder ri_gh; 1057 int error; 1058 1059 error = gfs2_rindex_hold(sdp, &ri_gh); 1060 if (error) 1061 return error; 1062 1063 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1064 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1065 1066 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); 1067 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1068 1069 1070 error = gfs2_glock_nq(ghs); /* parent */ 1071 if (error) 1072 goto out_parent; 1073 1074 error = gfs2_glock_nq(ghs + 1); /* child */ 1075 if (error) 1076 goto out_child; 1077 1078 error = -ENOENT; 1079 if (inode->i_nlink == 0) 1080 goto out_rgrp; 1081 1082 if (S_ISDIR(inode->i_mode)) { 1083 error = -ENOTEMPTY; 1084 if (ip->i_entries > 2 || inode->i_nlink > 2) 1085 goto out_rgrp; 1086 } 1087 1088 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1089 if (error) 1090 goto out_rgrp; 1091 1092 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1093 if (error) 1094 goto out_gunlock; 1095 1096 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1097 if (error) 1098 goto out_gunlock; 1099 1100 error = gfs2_meta_inode_buffer(ip, &bh); 1101 if (error) 1102 goto out_end_trans; 1103 1104 error = gfs2_unlink_inode(dip, dentry, bh); 1105 brelse(bh); 1106 1107 out_end_trans: 1108 gfs2_trans_end(sdp); 1109 out_gunlock: 1110 gfs2_glock_dq(ghs + 2); 1111 out_rgrp: 1112 gfs2_holder_uninit(ghs + 2); 1113 gfs2_glock_dq(ghs + 1); 1114 out_child: 1115 gfs2_holder_uninit(ghs + 1); 1116 gfs2_glock_dq(ghs); 1117 out_parent: 1118 gfs2_holder_uninit(ghs); 1119 gfs2_glock_dq_uninit(&ri_gh); 1120 return error; 1121 } 1122 1123 /** 1124 * gfs2_symlink - Create a symlink 1125 * @dir: The directory to create the symlink in 1126 * @dentry: The dentry to put the symlink in 1127 * @symname: The thing which the link points to 1128 * 1129 * Returns: errno 1130 */ 1131 1132 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1133 const char *symname) 1134 { 1135 struct gfs2_sbd *sdp = GFS2_SB(dir); 1136 unsigned int size; 1137 1138 size = strlen(symname); 1139 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1140 return -ENAMETOOLONG; 1141 1142 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size); 1143 } 1144 1145 /** 1146 * gfs2_mkdir - Make a directory 1147 * @dir: The parent directory of the new one 1148 * @dentry: The dentry of the new directory 1149 * @mode: The mode of the new directory 1150 * 1151 * Returns: errno 1152 */ 1153 1154 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) 1155 { 1156 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0); 1157 } 1158 1159 /** 1160 * gfs2_mknod - Make a special file 1161 * @dir: The directory in which the special file will reside 1162 * @dentry: The dentry of the special file 1163 * @mode: The mode of the special file 1164 * @dev: The device specification of the special file 1165 * 1166 */ 1167 1168 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, 1169 dev_t dev) 1170 { 1171 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0); 1172 } 1173 1174 /* 1175 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1176 * @this: move this 1177 * @to: to here 1178 * 1179 * Follow @to back to the root and make sure we don't encounter @this 1180 * Assumes we already hold the rename lock. 1181 * 1182 * Returns: errno 1183 */ 1184 1185 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1186 { 1187 struct inode *dir = &to->i_inode; 1188 struct super_block *sb = dir->i_sb; 1189 struct inode *tmp; 1190 int error = 0; 1191 1192 igrab(dir); 1193 1194 for (;;) { 1195 if (dir == &this->i_inode) { 1196 error = -EINVAL; 1197 break; 1198 } 1199 if (dir == sb->s_root->d_inode) { 1200 error = 0; 1201 break; 1202 } 1203 1204 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1205 if (IS_ERR(tmp)) { 1206 error = PTR_ERR(tmp); 1207 break; 1208 } 1209 1210 iput(dir); 1211 dir = tmp; 1212 } 1213 1214 iput(dir); 1215 1216 return error; 1217 } 1218 1219 /** 1220 * gfs2_rename - Rename a file 1221 * @odir: Parent directory of old file name 1222 * @odentry: The old dentry of the file 1223 * @ndir: Parent directory of new file name 1224 * @ndentry: The new dentry of the file 1225 * 1226 * Returns: errno 1227 */ 1228 1229 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1230 struct inode *ndir, struct dentry *ndentry) 1231 { 1232 struct gfs2_inode *odip = GFS2_I(odir); 1233 struct gfs2_inode *ndip = GFS2_I(ndir); 1234 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1235 struct gfs2_inode *nip = NULL; 1236 struct gfs2_sbd *sdp = GFS2_SB(odir); 1237 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; 1238 struct gfs2_rgrpd *nrgd; 1239 unsigned int num_gh; 1240 int dir_rename = 0; 1241 int alloc_required = 0; 1242 unsigned int x; 1243 int error; 1244 1245 if (ndentry->d_inode) { 1246 nip = GFS2_I(ndentry->d_inode); 1247 if (ip == nip) 1248 return 0; 1249 } 1250 1251 error = gfs2_rindex_hold(sdp, &ri_gh); 1252 if (error) 1253 return error; 1254 1255 if (odip != ndip) { 1256 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1257 0, &r_gh); 1258 if (error) 1259 goto out; 1260 1261 if (S_ISDIR(ip->i_inode.i_mode)) { 1262 dir_rename = 1; 1263 /* don't move a dirctory into it's subdir */ 1264 error = gfs2_ok_to_move(ip, ndip); 1265 if (error) 1266 goto out_gunlock_r; 1267 } 1268 } 1269 1270 num_gh = 1; 1271 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1272 if (odip != ndip) { 1273 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1274 num_gh++; 1275 } 1276 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1277 num_gh++; 1278 1279 if (nip) { 1280 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1281 num_gh++; 1282 /* grab the resource lock for unlink flag twiddling 1283 * this is the case of the target file already existing 1284 * so we unlink before doing the rename 1285 */ 1286 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); 1287 if (nrgd) 1288 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1289 } 1290 1291 for (x = 0; x < num_gh; x++) { 1292 error = gfs2_glock_nq(ghs + x); 1293 if (error) 1294 goto out_gunlock; 1295 } 1296 1297 error = -ENOENT; 1298 if (ip->i_inode.i_nlink == 0) 1299 goto out_gunlock; 1300 1301 /* Check out the old directory */ 1302 1303 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1304 if (error) 1305 goto out_gunlock; 1306 1307 /* Check out the new directory */ 1308 1309 if (nip) { 1310 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1311 if (error) 1312 goto out_gunlock; 1313 1314 if (nip->i_inode.i_nlink == 0) { 1315 error = -EAGAIN; 1316 goto out_gunlock; 1317 } 1318 1319 if (S_ISDIR(nip->i_inode.i_mode)) { 1320 if (nip->i_entries < 2) { 1321 gfs2_consist_inode(nip); 1322 error = -EIO; 1323 goto out_gunlock; 1324 } 1325 if (nip->i_entries > 2) { 1326 error = -ENOTEMPTY; 1327 goto out_gunlock; 1328 } 1329 } 1330 } else { 1331 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1332 if (error) 1333 goto out_gunlock; 1334 1335 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1336 switch (error) { 1337 case -ENOENT: 1338 error = 0; 1339 break; 1340 case 0: 1341 error = -EEXIST; 1342 default: 1343 goto out_gunlock; 1344 }; 1345 1346 if (odip != ndip) { 1347 if (!ndip->i_inode.i_nlink) { 1348 error = -ENOENT; 1349 goto out_gunlock; 1350 } 1351 if (ndip->i_entries == (u32)-1) { 1352 error = -EFBIG; 1353 goto out_gunlock; 1354 } 1355 if (S_ISDIR(ip->i_inode.i_mode) && 1356 ndip->i_inode.i_nlink == (u32)-1) { 1357 error = -EMLINK; 1358 goto out_gunlock; 1359 } 1360 } 1361 } 1362 1363 /* Check out the dir to be renamed */ 1364 1365 if (dir_rename) { 1366 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1367 if (error) 1368 goto out_gunlock; 1369 } 1370 1371 if (nip == NULL) 1372 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1373 error = alloc_required; 1374 if (error < 0) 1375 goto out_gunlock; 1376 error = 0; 1377 1378 if (alloc_required) { 1379 struct gfs2_alloc *al = gfs2_alloc_get(ndip); 1380 if (!al) { 1381 error = -ENOMEM; 1382 goto out_gunlock; 1383 } 1384 1385 error = gfs2_quota_lock_check(ndip); 1386 if (error) 1387 goto out_alloc; 1388 1389 al->al_requested = sdp->sd_max_dirres; 1390 1391 error = gfs2_inplace_reserve_ri(ndip); 1392 if (error) 1393 goto out_gunlock_q; 1394 1395 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1396 gfs2_rg_blocks(al) + 1397 4 * RES_DINODE + 4 * RES_LEAF + 1398 RES_STATFS + RES_QUOTA + 4, 0); 1399 if (error) 1400 goto out_ipreserv; 1401 } else { 1402 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1403 5 * RES_LEAF + 4, 0); 1404 if (error) 1405 goto out_gunlock; 1406 } 1407 1408 /* Remove the target file, if it exists */ 1409 1410 if (nip) { 1411 struct buffer_head *bh; 1412 error = gfs2_meta_inode_buffer(nip, &bh); 1413 if (error) 1414 goto out_end_trans; 1415 error = gfs2_unlink_inode(ndip, ndentry, bh); 1416 brelse(bh); 1417 } 1418 1419 if (dir_rename) { 1420 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1421 if (error) 1422 goto out_end_trans; 1423 } else { 1424 struct buffer_head *dibh; 1425 error = gfs2_meta_inode_buffer(ip, &dibh); 1426 if (error) 1427 goto out_end_trans; 1428 ip->i_inode.i_ctime = CURRENT_TIME; 1429 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1430 gfs2_dinode_out(ip, dibh->b_data); 1431 brelse(dibh); 1432 } 1433 1434 error = gfs2_dir_del(odip, odentry); 1435 if (error) 1436 goto out_end_trans; 1437 1438 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1439 if (error) 1440 goto out_end_trans; 1441 1442 out_end_trans: 1443 gfs2_trans_end(sdp); 1444 out_ipreserv: 1445 if (alloc_required) 1446 gfs2_inplace_release(ndip); 1447 out_gunlock_q: 1448 if (alloc_required) 1449 gfs2_quota_unlock(ndip); 1450 out_alloc: 1451 if (alloc_required) 1452 gfs2_alloc_put(ndip); 1453 out_gunlock: 1454 while (x--) { 1455 gfs2_glock_dq(ghs + x); 1456 gfs2_holder_uninit(ghs + x); 1457 } 1458 out_gunlock_r: 1459 if (r_gh.gh_gl) 1460 gfs2_glock_dq_uninit(&r_gh); 1461 out: 1462 gfs2_glock_dq_uninit(&ri_gh); 1463 return error; 1464 } 1465 1466 /** 1467 * gfs2_follow_link - Follow a symbolic link 1468 * @dentry: The dentry of the link 1469 * @nd: Data that we pass to vfs_follow_link() 1470 * 1471 * This can handle symlinks of any size. 1472 * 1473 * Returns: 0 on success or error code 1474 */ 1475 1476 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1477 { 1478 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1479 struct gfs2_holder i_gh; 1480 struct buffer_head *dibh; 1481 unsigned int size; 1482 char *buf; 1483 int error; 1484 1485 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1486 error = gfs2_glock_nq(&i_gh); 1487 if (error) { 1488 gfs2_holder_uninit(&i_gh); 1489 nd_set_link(nd, ERR_PTR(error)); 1490 return NULL; 1491 } 1492 1493 size = (unsigned int)i_size_read(&ip->i_inode); 1494 if (size == 0) { 1495 gfs2_consist_inode(ip); 1496 buf = ERR_PTR(-EIO); 1497 goto out; 1498 } 1499 1500 error = gfs2_meta_inode_buffer(ip, &dibh); 1501 if (error) { 1502 buf = ERR_PTR(error); 1503 goto out; 1504 } 1505 1506 buf = kzalloc(size + 1, GFP_NOFS); 1507 if (!buf) 1508 buf = ERR_PTR(-ENOMEM); 1509 else 1510 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1511 brelse(dibh); 1512 out: 1513 gfs2_glock_dq_uninit(&i_gh); 1514 nd_set_link(nd, buf); 1515 return NULL; 1516 } 1517 1518 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1519 { 1520 char *s = nd_get_link(nd); 1521 if (!IS_ERR(s)) 1522 kfree(s); 1523 } 1524 1525 /** 1526 * gfs2_permission - 1527 * @inode: The inode 1528 * @mask: The mask to be tested 1529 * @flags: Indicates whether this is an RCU path walk or not 1530 * 1531 * This may be called from the VFS directly, or from within GFS2 with the 1532 * inode locked, so we look to see if the glock is already locked and only 1533 * lock the glock if its not already been done. 1534 * 1535 * Returns: errno 1536 */ 1537 1538 int gfs2_permission(struct inode *inode, int mask) 1539 { 1540 struct gfs2_inode *ip; 1541 struct gfs2_holder i_gh; 1542 int error; 1543 int unlock = 0; 1544 1545 1546 ip = GFS2_I(inode); 1547 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1548 if (mask & MAY_NOT_BLOCK) 1549 return -ECHILD; 1550 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1551 if (error) 1552 return error; 1553 unlock = 1; 1554 } 1555 1556 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1557 error = -EACCES; 1558 else 1559 error = generic_permission(inode, mask); 1560 if (unlock) 1561 gfs2_glock_dq_uninit(&i_gh); 1562 1563 return error; 1564 } 1565 1566 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1567 { 1568 struct inode *inode = &ip->i_inode; 1569 struct buffer_head *dibh; 1570 int error; 1571 1572 error = gfs2_meta_inode_buffer(ip, &dibh); 1573 if (error) 1574 return error; 1575 1576 setattr_copy(inode, attr); 1577 mark_inode_dirty(inode); 1578 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1579 gfs2_dinode_out(ip, dibh->b_data); 1580 brelse(dibh); 1581 return 0; 1582 } 1583 1584 /** 1585 * gfs2_setattr_simple - 1586 * @ip: 1587 * @attr: 1588 * 1589 * Returns: errno 1590 */ 1591 1592 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1593 { 1594 int error; 1595 1596 if (current->journal_info) 1597 return __gfs2_setattr_simple(ip, attr); 1598 1599 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 1600 if (error) 1601 return error; 1602 1603 error = __gfs2_setattr_simple(ip, attr); 1604 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 1605 return error; 1606 } 1607 1608 static int setattr_chown(struct inode *inode, struct iattr *attr) 1609 { 1610 struct gfs2_inode *ip = GFS2_I(inode); 1611 struct gfs2_sbd *sdp = GFS2_SB(inode); 1612 u32 ouid, ogid, nuid, ngid; 1613 int error; 1614 1615 ouid = inode->i_uid; 1616 ogid = inode->i_gid; 1617 nuid = attr->ia_uid; 1618 ngid = attr->ia_gid; 1619 1620 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) 1621 ouid = nuid = NO_QUOTA_CHANGE; 1622 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) 1623 ogid = ngid = NO_QUOTA_CHANGE; 1624 1625 if (!gfs2_alloc_get(ip)) 1626 return -ENOMEM; 1627 1628 error = gfs2_quota_lock(ip, nuid, ngid); 1629 if (error) 1630 goto out_alloc; 1631 1632 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1633 error = gfs2_quota_check(ip, nuid, ngid); 1634 if (error) 1635 goto out_gunlock_q; 1636 } 1637 1638 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1639 if (error) 1640 goto out_gunlock_q; 1641 1642 error = gfs2_setattr_simple(ip, attr); 1643 if (error) 1644 goto out_end_trans; 1645 1646 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1647 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1648 gfs2_quota_change(ip, -blocks, ouid, ogid); 1649 gfs2_quota_change(ip, blocks, nuid, ngid); 1650 } 1651 1652 out_end_trans: 1653 gfs2_trans_end(sdp); 1654 out_gunlock_q: 1655 gfs2_quota_unlock(ip); 1656 out_alloc: 1657 gfs2_alloc_put(ip); 1658 return error; 1659 } 1660 1661 /** 1662 * gfs2_setattr - Change attributes on an inode 1663 * @dentry: The dentry which is changing 1664 * @attr: The structure describing the change 1665 * 1666 * The VFS layer wants to change one or more of an inodes attributes. Write 1667 * that change out to disk. 1668 * 1669 * Returns: errno 1670 */ 1671 1672 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1673 { 1674 struct inode *inode = dentry->d_inode; 1675 struct gfs2_inode *ip = GFS2_I(inode); 1676 struct gfs2_holder i_gh; 1677 int error; 1678 1679 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1680 if (error) 1681 return error; 1682 1683 error = -EPERM; 1684 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1685 goto out; 1686 1687 error = inode_change_ok(inode, attr); 1688 if (error) 1689 goto out; 1690 1691 if (attr->ia_valid & ATTR_SIZE) 1692 error = gfs2_setattr_size(inode, attr->ia_size); 1693 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1694 error = setattr_chown(inode, attr); 1695 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1696 error = gfs2_acl_chmod(ip, attr); 1697 else 1698 error = gfs2_setattr_simple(ip, attr); 1699 1700 out: 1701 gfs2_glock_dq_uninit(&i_gh); 1702 if (!error) 1703 mark_inode_dirty(inode); 1704 return error; 1705 } 1706 1707 /** 1708 * gfs2_getattr - Read out an inode's attributes 1709 * @mnt: The vfsmount the inode is being accessed from 1710 * @dentry: The dentry to stat 1711 * @stat: The inode's stats 1712 * 1713 * This may be called from the VFS directly, or from within GFS2 with the 1714 * inode locked, so we look to see if the glock is already locked and only 1715 * lock the glock if its not already been done. Note that its the NFS 1716 * readdirplus operation which causes this to be called (from filldir) 1717 * with the glock already held. 1718 * 1719 * Returns: errno 1720 */ 1721 1722 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1723 struct kstat *stat) 1724 { 1725 struct inode *inode = dentry->d_inode; 1726 struct gfs2_inode *ip = GFS2_I(inode); 1727 struct gfs2_holder gh; 1728 int error; 1729 int unlock = 0; 1730 1731 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1732 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1733 if (error) 1734 return error; 1735 unlock = 1; 1736 } 1737 1738 generic_fillattr(inode, stat); 1739 if (unlock) 1740 gfs2_glock_dq_uninit(&gh); 1741 1742 return 0; 1743 } 1744 1745 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1746 const void *data, size_t size, int flags) 1747 { 1748 struct inode *inode = dentry->d_inode; 1749 struct gfs2_inode *ip = GFS2_I(inode); 1750 struct gfs2_holder gh; 1751 int ret; 1752 1753 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1754 ret = gfs2_glock_nq(&gh); 1755 if (ret == 0) { 1756 ret = generic_setxattr(dentry, name, data, size, flags); 1757 gfs2_glock_dq(&gh); 1758 } 1759 gfs2_holder_uninit(&gh); 1760 return ret; 1761 } 1762 1763 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1764 void *data, size_t size) 1765 { 1766 struct inode *inode = dentry->d_inode; 1767 struct gfs2_inode *ip = GFS2_I(inode); 1768 struct gfs2_holder gh; 1769 int ret; 1770 1771 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1772 ret = gfs2_glock_nq(&gh); 1773 if (ret == 0) { 1774 ret = generic_getxattr(dentry, name, data, size); 1775 gfs2_glock_dq(&gh); 1776 } 1777 gfs2_holder_uninit(&gh); 1778 return ret; 1779 } 1780 1781 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1782 { 1783 struct inode *inode = dentry->d_inode; 1784 struct gfs2_inode *ip = GFS2_I(inode); 1785 struct gfs2_holder gh; 1786 int ret; 1787 1788 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1789 ret = gfs2_glock_nq(&gh); 1790 if (ret == 0) { 1791 ret = generic_removexattr(dentry, name); 1792 gfs2_glock_dq(&gh); 1793 } 1794 gfs2_holder_uninit(&gh); 1795 return ret; 1796 } 1797 1798 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1799 u64 start, u64 len) 1800 { 1801 struct gfs2_inode *ip = GFS2_I(inode); 1802 struct gfs2_holder gh; 1803 int ret; 1804 1805 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1806 if (ret) 1807 return ret; 1808 1809 mutex_lock(&inode->i_mutex); 1810 1811 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1812 if (ret) 1813 goto out; 1814 1815 if (gfs2_is_stuffed(ip)) { 1816 u64 phys = ip->i_no_addr << inode->i_blkbits; 1817 u64 size = i_size_read(inode); 1818 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1819 FIEMAP_EXTENT_DATA_INLINE; 1820 phys += sizeof(struct gfs2_dinode); 1821 phys += start; 1822 if (start + len > size) 1823 len = size - start; 1824 if (start < size) 1825 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1826 len, flags); 1827 if (ret == 1) 1828 ret = 0; 1829 } else { 1830 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1831 gfs2_block_map); 1832 } 1833 1834 gfs2_glock_dq_uninit(&gh); 1835 out: 1836 mutex_unlock(&inode->i_mutex); 1837 return ret; 1838 } 1839 1840 const struct inode_operations gfs2_file_iops = { 1841 .permission = gfs2_permission, 1842 .setattr = gfs2_setattr, 1843 .getattr = gfs2_getattr, 1844 .setxattr = gfs2_setxattr, 1845 .getxattr = gfs2_getxattr, 1846 .listxattr = gfs2_listxattr, 1847 .removexattr = gfs2_removexattr, 1848 .fiemap = gfs2_fiemap, 1849 .get_acl = gfs2_get_acl, 1850 }; 1851 1852 const struct inode_operations gfs2_dir_iops = { 1853 .create = gfs2_create, 1854 .lookup = gfs2_lookup, 1855 .link = gfs2_link, 1856 .unlink = gfs2_unlink, 1857 .symlink = gfs2_symlink, 1858 .mkdir = gfs2_mkdir, 1859 .rmdir = gfs2_unlink, 1860 .mknod = gfs2_mknod, 1861 .rename = gfs2_rename, 1862 .permission = gfs2_permission, 1863 .setattr = gfs2_setattr, 1864 .getattr = gfs2_getattr, 1865 .setxattr = gfs2_setxattr, 1866 .getxattr = gfs2_getxattr, 1867 .listxattr = gfs2_listxattr, 1868 .removexattr = gfs2_removexattr, 1869 .fiemap = gfs2_fiemap, 1870 .get_acl = gfs2_get_acl, 1871 }; 1872 1873 const struct inode_operations gfs2_symlink_iops = { 1874 .readlink = generic_readlink, 1875 .follow_link = gfs2_follow_link, 1876 .put_link = gfs2_put_link, 1877 .permission = gfs2_permission, 1878 .setattr = gfs2_setattr, 1879 .getattr = gfs2_getattr, 1880 .setxattr = gfs2_setxattr, 1881 .getxattr = gfs2_getxattr, 1882 .listxattr = gfs2_listxattr, 1883 .removexattr = gfs2_removexattr, 1884 .fiemap = gfs2_fiemap, 1885 .get_acl = gfs2_get_acl, 1886 }; 1887 1888