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, 0); 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, 0); 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 = NULL; 796 797 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 798 if (inode && IS_ERR(inode)) 799 return ERR_CAST(inode); 800 801 if (inode) { 802 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 803 struct gfs2_holder gh; 804 int error; 805 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 806 if (error) { 807 iput(inode); 808 return ERR_PTR(error); 809 } 810 gfs2_glock_dq_uninit(&gh); 811 return d_splice_alias(inode, dentry); 812 } 813 d_add(dentry, inode); 814 815 return NULL; 816 } 817 818 /** 819 * gfs2_link - Link to a file 820 * @old_dentry: The inode to link 821 * @dir: Add link to this directory 822 * @dentry: The name of the link 823 * 824 * Link the inode in "old_dentry" into the directory "dir" with the 825 * name in "dentry". 826 * 827 * Returns: errno 828 */ 829 830 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 831 struct dentry *dentry) 832 { 833 struct gfs2_inode *dip = GFS2_I(dir); 834 struct gfs2_sbd *sdp = GFS2_SB(dir); 835 struct inode *inode = old_dentry->d_inode; 836 struct gfs2_inode *ip = GFS2_I(inode); 837 struct gfs2_holder ghs[2]; 838 struct buffer_head *dibh; 839 int alloc_required; 840 int error; 841 842 if (S_ISDIR(inode->i_mode)) 843 return -EPERM; 844 845 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 846 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 847 848 error = gfs2_glock_nq(ghs); /* parent */ 849 if (error) 850 goto out_parent; 851 852 error = gfs2_glock_nq(ghs + 1); /* child */ 853 if (error) 854 goto out_child; 855 856 error = -ENOENT; 857 if (inode->i_nlink == 0) 858 goto out_gunlock; 859 860 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0); 861 if (error) 862 goto out_gunlock; 863 864 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 865 switch (error) { 866 case -ENOENT: 867 break; 868 case 0: 869 error = -EEXIST; 870 default: 871 goto out_gunlock; 872 } 873 874 error = -EINVAL; 875 if (!dip->i_inode.i_nlink) 876 goto out_gunlock; 877 error = -EFBIG; 878 if (dip->i_entries == (u32)-1) 879 goto out_gunlock; 880 error = -EPERM; 881 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 882 goto out_gunlock; 883 error = -EINVAL; 884 if (!ip->i_inode.i_nlink) 885 goto out_gunlock; 886 error = -EMLINK; 887 if (ip->i_inode.i_nlink == (u32)-1) 888 goto out_gunlock; 889 890 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 891 if (error < 0) 892 goto out_gunlock; 893 error = 0; 894 895 if (alloc_required) { 896 struct gfs2_alloc *al = gfs2_alloc_get(dip); 897 if (!al) { 898 error = -ENOMEM; 899 goto out_gunlock; 900 } 901 902 error = gfs2_quota_lock_check(dip); 903 if (error) 904 goto out_alloc; 905 906 al->al_requested = sdp->sd_max_dirres; 907 908 error = gfs2_inplace_reserve(dip); 909 if (error) 910 goto out_gunlock_q; 911 912 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 913 gfs2_rg_blocks(al) + 914 2 * RES_DINODE + RES_STATFS + 915 RES_QUOTA, 0); 916 if (error) 917 goto out_ipres; 918 } else { 919 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 920 if (error) 921 goto out_ipres; 922 } 923 924 error = gfs2_meta_inode_buffer(ip, &dibh); 925 if (error) 926 goto out_end_trans; 927 928 error = gfs2_dir_add(dir, &dentry->d_name, ip); 929 if (error) 930 goto out_brelse; 931 932 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 933 inc_nlink(&ip->i_inode); 934 ip->i_inode.i_ctime = CURRENT_TIME; 935 gfs2_dinode_out(ip, dibh->b_data); 936 mark_inode_dirty(&ip->i_inode); 937 938 out_brelse: 939 brelse(dibh); 940 out_end_trans: 941 gfs2_trans_end(sdp); 942 out_ipres: 943 if (alloc_required) 944 gfs2_inplace_release(dip); 945 out_gunlock_q: 946 if (alloc_required) 947 gfs2_quota_unlock(dip); 948 out_alloc: 949 if (alloc_required) 950 gfs2_alloc_put(dip); 951 out_gunlock: 952 gfs2_glock_dq(ghs + 1); 953 out_child: 954 gfs2_glock_dq(ghs); 955 out_parent: 956 gfs2_holder_uninit(ghs); 957 gfs2_holder_uninit(ghs + 1); 958 if (!error) { 959 ihold(inode); 960 d_instantiate(dentry, inode); 961 mark_inode_dirty(inode); 962 } 963 return error; 964 } 965 966 /* 967 * gfs2_unlink_ok - check to see that a inode is still in a directory 968 * @dip: the directory 969 * @name: the name of the file 970 * @ip: the inode 971 * 972 * Assumes that the lock on (at least) @dip is held. 973 * 974 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 975 */ 976 977 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 978 const struct gfs2_inode *ip) 979 { 980 int error; 981 982 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 983 return -EPERM; 984 985 if ((dip->i_inode.i_mode & S_ISVTX) && 986 dip->i_inode.i_uid != current_fsuid() && 987 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) 988 return -EPERM; 989 990 if (IS_APPEND(&dip->i_inode)) 991 return -EPERM; 992 993 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); 994 if (error) 995 return error; 996 997 error = gfs2_dir_check(&dip->i_inode, name, ip); 998 if (error) 999 return error; 1000 1001 return 0; 1002 } 1003 1004 /** 1005 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1006 * @dip: The parent directory 1007 * @name: The name of the entry in the parent directory 1008 * @bh: The inode buffer for the inode to be removed 1009 * @inode: The inode to be removed 1010 * 1011 * Called with all the locks and in a transaction. This will only be 1012 * called for a directory after it has been checked to ensure it is empty. 1013 * 1014 * Returns: 0 on success, or an error 1015 */ 1016 1017 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1018 const struct dentry *dentry, 1019 struct buffer_head *bh) 1020 { 1021 struct inode *inode = dentry->d_inode; 1022 struct gfs2_inode *ip = GFS2_I(inode); 1023 int error; 1024 1025 error = gfs2_dir_del(dip, dentry); 1026 if (error) 1027 return error; 1028 1029 ip->i_entries = 0; 1030 inode->i_ctime = CURRENT_TIME; 1031 if (S_ISDIR(inode->i_mode)) 1032 clear_nlink(inode); 1033 else 1034 drop_nlink(inode); 1035 gfs2_trans_add_bh(ip->i_gl, bh, 1); 1036 gfs2_dinode_out(ip, bh->b_data); 1037 mark_inode_dirty(inode); 1038 if (inode->i_nlink == 0) 1039 gfs2_unlink_di(inode); 1040 return 0; 1041 } 1042 1043 1044 /** 1045 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1046 * @dir: The inode of the directory containing the inode to unlink 1047 * @dentry: The file itself 1048 * 1049 * This routine uses the type of the inode as a flag to figure out 1050 * whether this is an unlink or an rmdir. 1051 * 1052 * Returns: errno 1053 */ 1054 1055 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1056 { 1057 struct gfs2_inode *dip = GFS2_I(dir); 1058 struct gfs2_sbd *sdp = GFS2_SB(dir); 1059 struct inode *inode = dentry->d_inode; 1060 struct gfs2_inode *ip = GFS2_I(inode); 1061 struct buffer_head *bh; 1062 struct gfs2_holder ghs[3]; 1063 struct gfs2_rgrpd *rgd; 1064 struct gfs2_holder ri_gh; 1065 int error; 1066 1067 error = gfs2_rindex_hold(sdp, &ri_gh); 1068 if (error) 1069 return error; 1070 1071 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1072 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1073 1074 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); 1075 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1076 1077 1078 error = gfs2_glock_nq(ghs); /* parent */ 1079 if (error) 1080 goto out_parent; 1081 1082 error = gfs2_glock_nq(ghs + 1); /* child */ 1083 if (error) 1084 goto out_child; 1085 1086 error = -ENOENT; 1087 if (inode->i_nlink == 0) 1088 goto out_rgrp; 1089 1090 if (S_ISDIR(inode->i_mode)) { 1091 error = -ENOTEMPTY; 1092 if (ip->i_entries > 2 || inode->i_nlink > 2) 1093 goto out_rgrp; 1094 } 1095 1096 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1097 if (error) 1098 goto out_rgrp; 1099 1100 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1101 if (error) 1102 goto out_gunlock; 1103 1104 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1105 if (error) 1106 goto out_gunlock; 1107 1108 error = gfs2_meta_inode_buffer(ip, &bh); 1109 if (error) 1110 goto out_end_trans; 1111 1112 error = gfs2_unlink_inode(dip, dentry, bh); 1113 brelse(bh); 1114 1115 out_end_trans: 1116 gfs2_trans_end(sdp); 1117 out_gunlock: 1118 gfs2_glock_dq(ghs + 2); 1119 out_rgrp: 1120 gfs2_holder_uninit(ghs + 2); 1121 gfs2_glock_dq(ghs + 1); 1122 out_child: 1123 gfs2_holder_uninit(ghs + 1); 1124 gfs2_glock_dq(ghs); 1125 out_parent: 1126 gfs2_holder_uninit(ghs); 1127 gfs2_glock_dq_uninit(&ri_gh); 1128 return error; 1129 } 1130 1131 /** 1132 * gfs2_symlink - Create a symlink 1133 * @dir: The directory to create the symlink in 1134 * @dentry: The dentry to put the symlink in 1135 * @symname: The thing which the link points to 1136 * 1137 * Returns: errno 1138 */ 1139 1140 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1141 const char *symname) 1142 { 1143 struct gfs2_sbd *sdp = GFS2_SB(dir); 1144 unsigned int size; 1145 1146 size = strlen(symname); 1147 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1148 return -ENAMETOOLONG; 1149 1150 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size); 1151 } 1152 1153 /** 1154 * gfs2_mkdir - Make a directory 1155 * @dir: The parent directory of the new one 1156 * @dentry: The dentry of the new directory 1157 * @mode: The mode of the new directory 1158 * 1159 * Returns: errno 1160 */ 1161 1162 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) 1163 { 1164 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0); 1165 } 1166 1167 /** 1168 * gfs2_mknod - Make a special file 1169 * @dir: The directory in which the special file will reside 1170 * @dentry: The dentry of the special file 1171 * @mode: The mode of the special file 1172 * @dev: The device specification of the special file 1173 * 1174 */ 1175 1176 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, 1177 dev_t dev) 1178 { 1179 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0); 1180 } 1181 1182 /* 1183 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1184 * @this: move this 1185 * @to: to here 1186 * 1187 * Follow @to back to the root and make sure we don't encounter @this 1188 * Assumes we already hold the rename lock. 1189 * 1190 * Returns: errno 1191 */ 1192 1193 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1194 { 1195 struct inode *dir = &to->i_inode; 1196 struct super_block *sb = dir->i_sb; 1197 struct inode *tmp; 1198 int error = 0; 1199 1200 igrab(dir); 1201 1202 for (;;) { 1203 if (dir == &this->i_inode) { 1204 error = -EINVAL; 1205 break; 1206 } 1207 if (dir == sb->s_root->d_inode) { 1208 error = 0; 1209 break; 1210 } 1211 1212 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1213 if (IS_ERR(tmp)) { 1214 error = PTR_ERR(tmp); 1215 break; 1216 } 1217 1218 iput(dir); 1219 dir = tmp; 1220 } 1221 1222 iput(dir); 1223 1224 return error; 1225 } 1226 1227 /** 1228 * gfs2_rename - Rename a file 1229 * @odir: Parent directory of old file name 1230 * @odentry: The old dentry of the file 1231 * @ndir: Parent directory of new file name 1232 * @ndentry: The new dentry of the file 1233 * 1234 * Returns: errno 1235 */ 1236 1237 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1238 struct inode *ndir, struct dentry *ndentry) 1239 { 1240 struct gfs2_inode *odip = GFS2_I(odir); 1241 struct gfs2_inode *ndip = GFS2_I(ndir); 1242 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1243 struct gfs2_inode *nip = NULL; 1244 struct gfs2_sbd *sdp = GFS2_SB(odir); 1245 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; 1246 struct gfs2_rgrpd *nrgd; 1247 unsigned int num_gh; 1248 int dir_rename = 0; 1249 int alloc_required = 0; 1250 unsigned int x; 1251 int error; 1252 1253 if (ndentry->d_inode) { 1254 nip = GFS2_I(ndentry->d_inode); 1255 if (ip == nip) 1256 return 0; 1257 } 1258 1259 error = gfs2_rindex_hold(sdp, &ri_gh); 1260 if (error) 1261 return error; 1262 1263 if (odip != ndip) { 1264 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1265 0, &r_gh); 1266 if (error) 1267 goto out; 1268 1269 if (S_ISDIR(ip->i_inode.i_mode)) { 1270 dir_rename = 1; 1271 /* don't move a dirctory into it's subdir */ 1272 error = gfs2_ok_to_move(ip, ndip); 1273 if (error) 1274 goto out_gunlock_r; 1275 } 1276 } 1277 1278 num_gh = 1; 1279 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1280 if (odip != ndip) { 1281 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1282 num_gh++; 1283 } 1284 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1285 num_gh++; 1286 1287 if (nip) { 1288 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1289 num_gh++; 1290 /* grab the resource lock for unlink flag twiddling 1291 * this is the case of the target file already existing 1292 * so we unlink before doing the rename 1293 */ 1294 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); 1295 if (nrgd) 1296 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1297 } 1298 1299 for (x = 0; x < num_gh; x++) { 1300 error = gfs2_glock_nq(ghs + x); 1301 if (error) 1302 goto out_gunlock; 1303 } 1304 1305 error = -ENOENT; 1306 if (ip->i_inode.i_nlink == 0) 1307 goto out_gunlock; 1308 1309 /* Check out the old directory */ 1310 1311 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1312 if (error) 1313 goto out_gunlock; 1314 1315 /* Check out the new directory */ 1316 1317 if (nip) { 1318 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1319 if (error) 1320 goto out_gunlock; 1321 1322 if (nip->i_inode.i_nlink == 0) { 1323 error = -EAGAIN; 1324 goto out_gunlock; 1325 } 1326 1327 if (S_ISDIR(nip->i_inode.i_mode)) { 1328 if (nip->i_entries < 2) { 1329 gfs2_consist_inode(nip); 1330 error = -EIO; 1331 goto out_gunlock; 1332 } 1333 if (nip->i_entries > 2) { 1334 error = -ENOTEMPTY; 1335 goto out_gunlock; 1336 } 1337 } 1338 } else { 1339 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0); 1340 if (error) 1341 goto out_gunlock; 1342 1343 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1344 switch (error) { 1345 case -ENOENT: 1346 error = 0; 1347 break; 1348 case 0: 1349 error = -EEXIST; 1350 default: 1351 goto out_gunlock; 1352 }; 1353 1354 if (odip != ndip) { 1355 if (!ndip->i_inode.i_nlink) { 1356 error = -ENOENT; 1357 goto out_gunlock; 1358 } 1359 if (ndip->i_entries == (u32)-1) { 1360 error = -EFBIG; 1361 goto out_gunlock; 1362 } 1363 if (S_ISDIR(ip->i_inode.i_mode) && 1364 ndip->i_inode.i_nlink == (u32)-1) { 1365 error = -EMLINK; 1366 goto out_gunlock; 1367 } 1368 } 1369 } 1370 1371 /* Check out the dir to be renamed */ 1372 1373 if (dir_rename) { 1374 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0); 1375 if (error) 1376 goto out_gunlock; 1377 } 1378 1379 if (nip == NULL) 1380 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1381 error = alloc_required; 1382 if (error < 0) 1383 goto out_gunlock; 1384 error = 0; 1385 1386 if (alloc_required) { 1387 struct gfs2_alloc *al = gfs2_alloc_get(ndip); 1388 if (!al) { 1389 error = -ENOMEM; 1390 goto out_gunlock; 1391 } 1392 1393 error = gfs2_quota_lock_check(ndip); 1394 if (error) 1395 goto out_alloc; 1396 1397 al->al_requested = sdp->sd_max_dirres; 1398 1399 error = gfs2_inplace_reserve_ri(ndip); 1400 if (error) 1401 goto out_gunlock_q; 1402 1403 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1404 gfs2_rg_blocks(al) + 1405 4 * RES_DINODE + 4 * RES_LEAF + 1406 RES_STATFS + RES_QUOTA + 4, 0); 1407 if (error) 1408 goto out_ipreserv; 1409 } else { 1410 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1411 5 * RES_LEAF + 4, 0); 1412 if (error) 1413 goto out_gunlock; 1414 } 1415 1416 /* Remove the target file, if it exists */ 1417 1418 if (nip) { 1419 struct buffer_head *bh; 1420 error = gfs2_meta_inode_buffer(nip, &bh); 1421 if (error) 1422 goto out_end_trans; 1423 error = gfs2_unlink_inode(ndip, ndentry, bh); 1424 brelse(bh); 1425 } 1426 1427 if (dir_rename) { 1428 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1429 if (error) 1430 goto out_end_trans; 1431 } else { 1432 struct buffer_head *dibh; 1433 error = gfs2_meta_inode_buffer(ip, &dibh); 1434 if (error) 1435 goto out_end_trans; 1436 ip->i_inode.i_ctime = CURRENT_TIME; 1437 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1438 gfs2_dinode_out(ip, dibh->b_data); 1439 brelse(dibh); 1440 } 1441 1442 error = gfs2_dir_del(odip, odentry); 1443 if (error) 1444 goto out_end_trans; 1445 1446 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1447 if (error) 1448 goto out_end_trans; 1449 1450 out_end_trans: 1451 gfs2_trans_end(sdp); 1452 out_ipreserv: 1453 if (alloc_required) 1454 gfs2_inplace_release(ndip); 1455 out_gunlock_q: 1456 if (alloc_required) 1457 gfs2_quota_unlock(ndip); 1458 out_alloc: 1459 if (alloc_required) 1460 gfs2_alloc_put(ndip); 1461 out_gunlock: 1462 while (x--) { 1463 gfs2_glock_dq(ghs + x); 1464 gfs2_holder_uninit(ghs + x); 1465 } 1466 out_gunlock_r: 1467 if (r_gh.gh_gl) 1468 gfs2_glock_dq_uninit(&r_gh); 1469 out: 1470 gfs2_glock_dq_uninit(&ri_gh); 1471 return error; 1472 } 1473 1474 /** 1475 * gfs2_follow_link - Follow a symbolic link 1476 * @dentry: The dentry of the link 1477 * @nd: Data that we pass to vfs_follow_link() 1478 * 1479 * This can handle symlinks of any size. 1480 * 1481 * Returns: 0 on success or error code 1482 */ 1483 1484 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1485 { 1486 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1487 struct gfs2_holder i_gh; 1488 struct buffer_head *dibh; 1489 unsigned int size; 1490 char *buf; 1491 int error; 1492 1493 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1494 error = gfs2_glock_nq(&i_gh); 1495 if (error) { 1496 gfs2_holder_uninit(&i_gh); 1497 nd_set_link(nd, ERR_PTR(error)); 1498 return NULL; 1499 } 1500 1501 size = (unsigned int)i_size_read(&ip->i_inode); 1502 if (size == 0) { 1503 gfs2_consist_inode(ip); 1504 buf = ERR_PTR(-EIO); 1505 goto out; 1506 } 1507 1508 error = gfs2_meta_inode_buffer(ip, &dibh); 1509 if (error) { 1510 buf = ERR_PTR(error); 1511 goto out; 1512 } 1513 1514 buf = kzalloc(size + 1, GFP_NOFS); 1515 if (!buf) 1516 buf = ERR_PTR(-ENOMEM); 1517 else 1518 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1519 brelse(dibh); 1520 out: 1521 gfs2_glock_dq_uninit(&i_gh); 1522 nd_set_link(nd, buf); 1523 return NULL; 1524 } 1525 1526 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1527 { 1528 char *s = nd_get_link(nd); 1529 if (!IS_ERR(s)) 1530 kfree(s); 1531 } 1532 1533 /** 1534 * gfs2_permission - 1535 * @inode: The inode 1536 * @mask: The mask to be tested 1537 * @flags: Indicates whether this is an RCU path walk or not 1538 * 1539 * This may be called from the VFS directly, or from within GFS2 with the 1540 * inode locked, so we look to see if the glock is already locked and only 1541 * lock the glock if its not already been done. 1542 * 1543 * Returns: errno 1544 */ 1545 1546 int gfs2_permission(struct inode *inode, int mask, unsigned int flags) 1547 { 1548 struct gfs2_inode *ip; 1549 struct gfs2_holder i_gh; 1550 int error; 1551 int unlock = 0; 1552 1553 1554 ip = GFS2_I(inode); 1555 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1556 if (flags & IPERM_FLAG_RCU) 1557 return -ECHILD; 1558 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1559 if (error) 1560 return error; 1561 unlock = 1; 1562 } 1563 1564 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1565 error = -EACCES; 1566 else 1567 error = generic_permission(inode, mask, flags, gfs2_check_acl); 1568 if (unlock) 1569 gfs2_glock_dq_uninit(&i_gh); 1570 1571 return error; 1572 } 1573 1574 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1575 { 1576 struct inode *inode = &ip->i_inode; 1577 struct buffer_head *dibh; 1578 int error; 1579 1580 error = gfs2_meta_inode_buffer(ip, &dibh); 1581 if (error) 1582 return error; 1583 1584 setattr_copy(inode, attr); 1585 mark_inode_dirty(inode); 1586 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1587 gfs2_dinode_out(ip, dibh->b_data); 1588 brelse(dibh); 1589 return 0; 1590 } 1591 1592 /** 1593 * gfs2_setattr_simple - 1594 * @ip: 1595 * @attr: 1596 * 1597 * Returns: errno 1598 */ 1599 1600 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1601 { 1602 int error; 1603 1604 if (current->journal_info) 1605 return __gfs2_setattr_simple(ip, attr); 1606 1607 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 1608 if (error) 1609 return error; 1610 1611 error = __gfs2_setattr_simple(ip, attr); 1612 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 1613 return error; 1614 } 1615 1616 static int setattr_chown(struct inode *inode, struct iattr *attr) 1617 { 1618 struct gfs2_inode *ip = GFS2_I(inode); 1619 struct gfs2_sbd *sdp = GFS2_SB(inode); 1620 u32 ouid, ogid, nuid, ngid; 1621 int error; 1622 1623 ouid = inode->i_uid; 1624 ogid = inode->i_gid; 1625 nuid = attr->ia_uid; 1626 ngid = attr->ia_gid; 1627 1628 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) 1629 ouid = nuid = NO_QUOTA_CHANGE; 1630 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) 1631 ogid = ngid = NO_QUOTA_CHANGE; 1632 1633 if (!gfs2_alloc_get(ip)) 1634 return -ENOMEM; 1635 1636 error = gfs2_quota_lock(ip, nuid, ngid); 1637 if (error) 1638 goto out_alloc; 1639 1640 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1641 error = gfs2_quota_check(ip, nuid, ngid); 1642 if (error) 1643 goto out_gunlock_q; 1644 } 1645 1646 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1647 if (error) 1648 goto out_gunlock_q; 1649 1650 error = gfs2_setattr_simple(ip, attr); 1651 if (error) 1652 goto out_end_trans; 1653 1654 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1655 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1656 gfs2_quota_change(ip, -blocks, ouid, ogid); 1657 gfs2_quota_change(ip, blocks, nuid, ngid); 1658 } 1659 1660 out_end_trans: 1661 gfs2_trans_end(sdp); 1662 out_gunlock_q: 1663 gfs2_quota_unlock(ip); 1664 out_alloc: 1665 gfs2_alloc_put(ip); 1666 return error; 1667 } 1668 1669 /** 1670 * gfs2_setattr - Change attributes on an inode 1671 * @dentry: The dentry which is changing 1672 * @attr: The structure describing the change 1673 * 1674 * The VFS layer wants to change one or more of an inodes attributes. Write 1675 * that change out to disk. 1676 * 1677 * Returns: errno 1678 */ 1679 1680 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1681 { 1682 struct inode *inode = dentry->d_inode; 1683 struct gfs2_inode *ip = GFS2_I(inode); 1684 struct gfs2_holder i_gh; 1685 int error; 1686 1687 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1688 if (error) 1689 return error; 1690 1691 error = -EPERM; 1692 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1693 goto out; 1694 1695 error = inode_change_ok(inode, attr); 1696 if (error) 1697 goto out; 1698 1699 if (attr->ia_valid & ATTR_SIZE) 1700 error = gfs2_setattr_size(inode, attr->ia_size); 1701 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1702 error = setattr_chown(inode, attr); 1703 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1704 error = gfs2_acl_chmod(ip, attr); 1705 else 1706 error = gfs2_setattr_simple(ip, attr); 1707 1708 out: 1709 gfs2_glock_dq_uninit(&i_gh); 1710 if (!error) 1711 mark_inode_dirty(inode); 1712 return error; 1713 } 1714 1715 /** 1716 * gfs2_getattr - Read out an inode's attributes 1717 * @mnt: The vfsmount the inode is being accessed from 1718 * @dentry: The dentry to stat 1719 * @stat: The inode's stats 1720 * 1721 * This may be called from the VFS directly, or from within GFS2 with the 1722 * inode locked, so we look to see if the glock is already locked and only 1723 * lock the glock if its not already been done. Note that its the NFS 1724 * readdirplus operation which causes this to be called (from filldir) 1725 * with the glock already held. 1726 * 1727 * Returns: errno 1728 */ 1729 1730 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1731 struct kstat *stat) 1732 { 1733 struct inode *inode = dentry->d_inode; 1734 struct gfs2_inode *ip = GFS2_I(inode); 1735 struct gfs2_holder gh; 1736 int error; 1737 int unlock = 0; 1738 1739 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1740 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1741 if (error) 1742 return error; 1743 unlock = 1; 1744 } 1745 1746 generic_fillattr(inode, stat); 1747 if (unlock) 1748 gfs2_glock_dq_uninit(&gh); 1749 1750 return 0; 1751 } 1752 1753 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1754 const void *data, size_t size, int flags) 1755 { 1756 struct inode *inode = dentry->d_inode; 1757 struct gfs2_inode *ip = GFS2_I(inode); 1758 struct gfs2_holder gh; 1759 int ret; 1760 1761 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1762 ret = gfs2_glock_nq(&gh); 1763 if (ret == 0) { 1764 ret = generic_setxattr(dentry, name, data, size, flags); 1765 gfs2_glock_dq(&gh); 1766 } 1767 gfs2_holder_uninit(&gh); 1768 return ret; 1769 } 1770 1771 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1772 void *data, size_t size) 1773 { 1774 struct inode *inode = dentry->d_inode; 1775 struct gfs2_inode *ip = GFS2_I(inode); 1776 struct gfs2_holder gh; 1777 int ret; 1778 1779 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1780 ret = gfs2_glock_nq(&gh); 1781 if (ret == 0) { 1782 ret = generic_getxattr(dentry, name, data, size); 1783 gfs2_glock_dq(&gh); 1784 } 1785 gfs2_holder_uninit(&gh); 1786 return ret; 1787 } 1788 1789 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1790 { 1791 struct inode *inode = dentry->d_inode; 1792 struct gfs2_inode *ip = GFS2_I(inode); 1793 struct gfs2_holder gh; 1794 int ret; 1795 1796 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1797 ret = gfs2_glock_nq(&gh); 1798 if (ret == 0) { 1799 ret = generic_removexattr(dentry, name); 1800 gfs2_glock_dq(&gh); 1801 } 1802 gfs2_holder_uninit(&gh); 1803 return ret; 1804 } 1805 1806 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1807 u64 start, u64 len) 1808 { 1809 struct gfs2_inode *ip = GFS2_I(inode); 1810 struct gfs2_holder gh; 1811 int ret; 1812 1813 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1814 if (ret) 1815 return ret; 1816 1817 mutex_lock(&inode->i_mutex); 1818 1819 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1820 if (ret) 1821 goto out; 1822 1823 if (gfs2_is_stuffed(ip)) { 1824 u64 phys = ip->i_no_addr << inode->i_blkbits; 1825 u64 size = i_size_read(inode); 1826 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1827 FIEMAP_EXTENT_DATA_INLINE; 1828 phys += sizeof(struct gfs2_dinode); 1829 phys += start; 1830 if (start + len > size) 1831 len = size - start; 1832 if (start < size) 1833 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1834 len, flags); 1835 if (ret == 1) 1836 ret = 0; 1837 } else { 1838 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1839 gfs2_block_map); 1840 } 1841 1842 gfs2_glock_dq_uninit(&gh); 1843 out: 1844 mutex_unlock(&inode->i_mutex); 1845 return ret; 1846 } 1847 1848 const struct inode_operations gfs2_file_iops = { 1849 .permission = gfs2_permission, 1850 .setattr = gfs2_setattr, 1851 .getattr = gfs2_getattr, 1852 .setxattr = gfs2_setxattr, 1853 .getxattr = gfs2_getxattr, 1854 .listxattr = gfs2_listxattr, 1855 .removexattr = gfs2_removexattr, 1856 .fiemap = gfs2_fiemap, 1857 }; 1858 1859 const struct inode_operations gfs2_dir_iops = { 1860 .create = gfs2_create, 1861 .lookup = gfs2_lookup, 1862 .link = gfs2_link, 1863 .unlink = gfs2_unlink, 1864 .symlink = gfs2_symlink, 1865 .mkdir = gfs2_mkdir, 1866 .rmdir = gfs2_unlink, 1867 .mknod = gfs2_mknod, 1868 .rename = gfs2_rename, 1869 .permission = gfs2_permission, 1870 .setattr = gfs2_setattr, 1871 .getattr = gfs2_getattr, 1872 .setxattr = gfs2_setxattr, 1873 .getxattr = gfs2_getxattr, 1874 .listxattr = gfs2_listxattr, 1875 .removexattr = gfs2_removexattr, 1876 .fiemap = gfs2_fiemap, 1877 }; 1878 1879 const struct inode_operations gfs2_symlink_iops = { 1880 .readlink = generic_readlink, 1881 .follow_link = gfs2_follow_link, 1882 .put_link = gfs2_put_link, 1883 .permission = gfs2_permission, 1884 .setattr = gfs2_setattr, 1885 .getattr = gfs2_getattr, 1886 .setxattr = gfs2_setxattr, 1887 .getxattr = gfs2_getxattr, 1888 .listxattr = gfs2_listxattr, 1889 .removexattr = gfs2_removexattr, 1890 .fiemap = gfs2_fiemap, 1891 }; 1892 1893