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 umode_t 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, umode_t *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 int dblocks = 1; 393 394 error = gfs2_inplace_reserve(dip, RES_DINODE); 395 if (error) 396 goto out; 397 398 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 399 if (error) 400 goto out_ipreserv; 401 402 error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation); 403 404 gfs2_trans_end(sdp); 405 406 out_ipreserv: 407 gfs2_inplace_release(dip); 408 out: 409 return error; 410 } 411 412 static void gfs2_init_dir(struct buffer_head *dibh, 413 const struct gfs2_inode *parent) 414 { 415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 417 418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 419 dent->de_inum = di->di_num; /* already GFS2 endian */ 420 dent->de_type = cpu_to_be16(DT_DIR); 421 422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 424 gfs2_inum_out(parent, dent); 425 dent->de_type = cpu_to_be16(DT_DIR); 426 427 } 428 429 /** 430 * init_dinode - Fill in a new dinode structure 431 * @dip: The directory this inode is being created in 432 * @gl: The glock covering the new inode 433 * @inum: The inode number 434 * @mode: The file permissions 435 * @uid: The uid of the new inode 436 * @gid: The gid of the new inode 437 * @generation: The generation number of the new inode 438 * @dev: The device number (if a device node) 439 * @symname: The symlink destination (if a symlink) 440 * @size: The inode size (ignored for directories) 441 * @bhp: The buffer head (returned to caller) 442 * 443 */ 444 445 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 446 const struct gfs2_inum_host *inum, umode_t mode, 447 unsigned int uid, unsigned int gid, 448 const u64 *generation, dev_t dev, const char *symname, 449 unsigned size, struct buffer_head **bhp) 450 { 451 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 452 struct gfs2_dinode *di; 453 struct buffer_head *dibh; 454 struct timespec tv = CURRENT_TIME; 455 456 dibh = gfs2_meta_new(gl, inum->no_addr); 457 gfs2_trans_add_bh(gl, dibh, 1); 458 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 459 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 460 di = (struct gfs2_dinode *)dibh->b_data; 461 462 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 463 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 464 di->di_mode = cpu_to_be32(mode); 465 di->di_uid = cpu_to_be32(uid); 466 di->di_gid = cpu_to_be32(gid); 467 di->di_nlink = 0; 468 di->di_size = cpu_to_be64(size); 469 di->di_blocks = cpu_to_be64(1); 470 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); 471 di->di_major = cpu_to_be32(MAJOR(dev)); 472 di->di_minor = cpu_to_be32(MINOR(dev)); 473 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 474 di->di_generation = cpu_to_be64(*generation); 475 di->di_flags = 0; 476 di->__pad1 = 0; 477 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); 478 di->di_height = 0; 479 di->__pad2 = 0; 480 di->__pad3 = 0; 481 di->di_depth = 0; 482 di->di_entries = 0; 483 memset(&di->__pad4, 0, sizeof(di->__pad4)); 484 di->di_eattr = 0; 485 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); 486 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); 487 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); 488 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 489 490 switch(mode & S_IFMT) { 491 case S_IFREG: 492 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 493 gfs2_tune_get(sdp, gt_new_files_jdata)) 494 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 495 break; 496 case S_IFDIR: 497 di->di_flags |= cpu_to_be32(dip->i_diskflags & 498 GFS2_DIF_INHERIT_JDATA); 499 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 500 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); 501 di->di_entries = cpu_to_be32(2); 502 gfs2_init_dir(dibh, dip); 503 break; 504 case S_IFLNK: 505 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size); 506 break; 507 } 508 509 set_buffer_uptodate(dibh); 510 511 *bhp = dibh; 512 } 513 514 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 515 umode_t mode, const struct gfs2_inum_host *inum, 516 const u64 *generation, dev_t dev, const char *symname, 517 unsigned int size, struct buffer_head **bhp) 518 { 519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 520 unsigned int uid, gid; 521 int error; 522 523 munge_mode_uid_gid(dip, &mode, &uid, &gid); 524 if (!gfs2_qadata_get(dip)) 525 return -ENOMEM; 526 527 error = gfs2_quota_lock(dip, uid, gid); 528 if (error) 529 goto out; 530 531 error = gfs2_quota_check(dip, uid, gid); 532 if (error) 533 goto out_quota; 534 535 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 536 if (error) 537 goto out_quota; 538 539 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp); 540 gfs2_quota_change(dip, +1, uid, gid); 541 gfs2_trans_end(sdp); 542 543 out_quota: 544 gfs2_quota_unlock(dip); 545 out: 546 gfs2_qadata_put(dip); 547 return error; 548 } 549 550 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 551 struct gfs2_inode *ip) 552 { 553 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 554 struct gfs2_qadata *qa; 555 int alloc_required; 556 struct buffer_head *dibh; 557 int error; 558 559 qa = gfs2_qadata_get(dip); 560 if (!qa) 561 return -ENOMEM; 562 563 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 564 if (error) 565 goto fail; 566 567 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 568 if (alloc_required < 0) 569 goto fail_quota_locks; 570 if (alloc_required) { 571 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); 572 if (error) 573 goto fail_quota_locks; 574 575 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); 576 if (error) 577 goto fail_quota_locks; 578 579 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 580 dip->i_rgd->rd_length + 581 2 * RES_DINODE + 582 RES_STATFS + RES_QUOTA, 0); 583 if (error) 584 goto fail_ipreserv; 585 } else { 586 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 587 if (error) 588 goto fail_quota_locks; 589 } 590 591 error = gfs2_dir_add(&dip->i_inode, name, ip); 592 if (error) 593 goto fail_end_trans; 594 595 error = gfs2_meta_inode_buffer(ip, &dibh); 596 if (error) 597 goto fail_end_trans; 598 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); 599 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 600 gfs2_dinode_out(ip, dibh->b_data); 601 brelse(dibh); 602 return 0; 603 604 fail_end_trans: 605 gfs2_trans_end(sdp); 606 607 fail_ipreserv: 608 gfs2_inplace_release(dip); 609 610 fail_quota_locks: 611 gfs2_quota_unlock(dip); 612 613 fail: 614 gfs2_qadata_put(dip); 615 return error; 616 } 617 618 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 619 void *fs_info) 620 { 621 const struct xattr *xattr; 622 int err = 0; 623 624 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 625 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 626 xattr->value_len, 0, 627 GFS2_EATYPE_SECURITY); 628 if (err < 0) 629 break; 630 } 631 return err; 632 } 633 634 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 635 const struct qstr *qstr) 636 { 637 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 638 &gfs2_initxattrs, NULL); 639 } 640 641 /** 642 * gfs2_create_inode - Create a new inode 643 * @dir: The parent directory 644 * @dentry: The new dentry 645 * @mode: The permissions on the new inode 646 * @dev: For device nodes, this is the device number 647 * @symname: For symlinks, this is the link destination 648 * @size: The initial size of the inode (ignored for directories) 649 * 650 * Returns: 0 on success, or error code 651 */ 652 653 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 654 umode_t mode, dev_t dev, const char *symname, 655 unsigned int size, int excl) 656 { 657 const struct qstr *name = &dentry->d_name; 658 struct gfs2_holder ghs[2]; 659 struct inode *inode = NULL; 660 struct gfs2_inode *dip = GFS2_I(dir); 661 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 662 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; 663 int error; 664 u64 generation; 665 struct buffer_head *bh = NULL; 666 667 if (!name->len || name->len > GFS2_FNAMESIZE) 668 return -ENAMETOOLONG; 669 670 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 671 if (error) 672 goto fail; 673 674 error = create_ok(dip, name, mode); 675 if ((error == -EEXIST) && S_ISREG(mode) && !excl) { 676 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 677 gfs2_glock_dq_uninit(ghs); 678 d_instantiate(dentry, inode); 679 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 680 } 681 if (error) 682 goto fail_gunlock; 683 684 error = alloc_dinode(dip, &inum.no_addr, &generation); 685 if (error) 686 goto fail_gunlock; 687 inum.no_formal_ino = generation; 688 689 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, 690 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 691 if (error) 692 goto fail_gunlock; 693 694 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh); 695 if (error) 696 goto fail_gunlock2; 697 698 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, 699 inum.no_formal_ino, 0); 700 if (IS_ERR(inode)) 701 goto fail_gunlock2; 702 703 error = gfs2_inode_refresh(GFS2_I(inode)); 704 if (error) 705 goto fail_gunlock2; 706 707 error = gfs2_acl_create(dip, inode); 708 if (error) 709 goto fail_gunlock2; 710 711 error = gfs2_security_init(dip, GFS2_I(inode), name); 712 if (error) 713 goto fail_gunlock2; 714 715 error = link_dinode(dip, name, GFS2_I(inode)); 716 if (error) 717 goto fail_gunlock2; 718 719 if (bh) 720 brelse(bh); 721 722 gfs2_trans_end(sdp); 723 /* Check if we reserved space in the rgrp. Function link_dinode may 724 not, depending on whether alloc is required. */ 725 if (dip->i_res) 726 gfs2_inplace_release(dip); 727 gfs2_quota_unlock(dip); 728 gfs2_qadata_put(dip); 729 mark_inode_dirty(inode); 730 gfs2_glock_dq_uninit_m(2, ghs); 731 d_instantiate(dentry, inode); 732 return 0; 733 734 fail_gunlock2: 735 gfs2_glock_dq_uninit(ghs + 1); 736 fail_gunlock: 737 gfs2_glock_dq_uninit(ghs); 738 if (inode && !IS_ERR(inode)) { 739 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 740 iput(inode); 741 } 742 fail: 743 if (bh) 744 brelse(bh); 745 return error; 746 } 747 748 /** 749 * gfs2_create - Create a file 750 * @dir: The directory in which to create the file 751 * @dentry: The dentry of the new file 752 * @mode: The mode of the new file 753 * 754 * Returns: errno 755 */ 756 757 static int gfs2_create(struct inode *dir, struct dentry *dentry, 758 umode_t mode, struct nameidata *nd) 759 { 760 int excl = 0; 761 if (nd && (nd->flags & LOOKUP_EXCL)) 762 excl = 1; 763 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); 764 } 765 766 /** 767 * gfs2_lookup - Look up a filename in a directory and return its inode 768 * @dir: The directory inode 769 * @dentry: The dentry of the new inode 770 * @nd: passed from Linux VFS, ignored by us 771 * 772 * Called by the VFS layer. Lock dir and call gfs2_lookupi() 773 * 774 * Returns: errno 775 */ 776 777 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 778 struct nameidata *nd) 779 { 780 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); 781 if (inode && !IS_ERR(inode)) { 782 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 783 struct gfs2_holder gh; 784 int error; 785 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 786 if (error) { 787 iput(inode); 788 return ERR_PTR(error); 789 } 790 gfs2_glock_dq_uninit(&gh); 791 } 792 return d_splice_alias(inode, dentry); 793 } 794 795 /** 796 * gfs2_link - Link to a file 797 * @old_dentry: The inode to link 798 * @dir: Add link to this directory 799 * @dentry: The name of the link 800 * 801 * Link the inode in "old_dentry" into the directory "dir" with the 802 * name in "dentry". 803 * 804 * Returns: errno 805 */ 806 807 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 808 struct dentry *dentry) 809 { 810 struct gfs2_inode *dip = GFS2_I(dir); 811 struct gfs2_sbd *sdp = GFS2_SB(dir); 812 struct inode *inode = old_dentry->d_inode; 813 struct gfs2_inode *ip = GFS2_I(inode); 814 struct gfs2_holder ghs[2]; 815 struct buffer_head *dibh; 816 int alloc_required; 817 int error; 818 819 if (S_ISDIR(inode->i_mode)) 820 return -EPERM; 821 822 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 823 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 824 825 error = gfs2_glock_nq(ghs); /* parent */ 826 if (error) 827 goto out_parent; 828 829 error = gfs2_glock_nq(ghs + 1); /* child */ 830 if (error) 831 goto out_child; 832 833 error = -ENOENT; 834 if (inode->i_nlink == 0) 835 goto out_gunlock; 836 837 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 838 if (error) 839 goto out_gunlock; 840 841 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 842 switch (error) { 843 case -ENOENT: 844 break; 845 case 0: 846 error = -EEXIST; 847 default: 848 goto out_gunlock; 849 } 850 851 error = -EINVAL; 852 if (!dip->i_inode.i_nlink) 853 goto out_gunlock; 854 error = -EFBIG; 855 if (dip->i_entries == (u32)-1) 856 goto out_gunlock; 857 error = -EPERM; 858 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 859 goto out_gunlock; 860 error = -EINVAL; 861 if (!ip->i_inode.i_nlink) 862 goto out_gunlock; 863 error = -EMLINK; 864 if (ip->i_inode.i_nlink == (u32)-1) 865 goto out_gunlock; 866 867 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 868 if (error < 0) 869 goto out_gunlock; 870 error = 0; 871 872 if (alloc_required) { 873 struct gfs2_qadata *qa = gfs2_qadata_get(dip); 874 875 if (!qa) { 876 error = -ENOMEM; 877 goto out_gunlock; 878 } 879 880 error = gfs2_quota_lock_check(dip); 881 if (error) 882 goto out_alloc; 883 884 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); 885 if (error) 886 goto out_gunlock_q; 887 888 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 889 gfs2_rg_blocks(dip) + 890 2 * RES_DINODE + RES_STATFS + 891 RES_QUOTA, 0); 892 if (error) 893 goto out_ipres; 894 } else { 895 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 896 if (error) 897 goto out_ipres; 898 } 899 900 error = gfs2_meta_inode_buffer(ip, &dibh); 901 if (error) 902 goto out_end_trans; 903 904 error = gfs2_dir_add(dir, &dentry->d_name, ip); 905 if (error) 906 goto out_brelse; 907 908 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 909 inc_nlink(&ip->i_inode); 910 ip->i_inode.i_ctime = CURRENT_TIME; 911 ihold(inode); 912 d_instantiate(dentry, inode); 913 mark_inode_dirty(inode); 914 915 out_brelse: 916 brelse(dibh); 917 out_end_trans: 918 gfs2_trans_end(sdp); 919 out_ipres: 920 if (alloc_required) 921 gfs2_inplace_release(dip); 922 out_gunlock_q: 923 if (alloc_required) 924 gfs2_quota_unlock(dip); 925 out_alloc: 926 if (alloc_required) 927 gfs2_qadata_put(dip); 928 out_gunlock: 929 gfs2_glock_dq(ghs + 1); 930 out_child: 931 gfs2_glock_dq(ghs); 932 out_parent: 933 gfs2_holder_uninit(ghs); 934 gfs2_holder_uninit(ghs + 1); 935 return error; 936 } 937 938 /* 939 * gfs2_unlink_ok - check to see that a inode is still in a directory 940 * @dip: the directory 941 * @name: the name of the file 942 * @ip: the inode 943 * 944 * Assumes that the lock on (at least) @dip is held. 945 * 946 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 947 */ 948 949 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 950 const struct gfs2_inode *ip) 951 { 952 int error; 953 954 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 955 return -EPERM; 956 957 if ((dip->i_inode.i_mode & S_ISVTX) && 958 dip->i_inode.i_uid != current_fsuid() && 959 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) 960 return -EPERM; 961 962 if (IS_APPEND(&dip->i_inode)) 963 return -EPERM; 964 965 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 966 if (error) 967 return error; 968 969 error = gfs2_dir_check(&dip->i_inode, name, ip); 970 if (error) 971 return error; 972 973 return 0; 974 } 975 976 /** 977 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 978 * @dip: The parent directory 979 * @name: The name of the entry in the parent directory 980 * @bh: The inode buffer for the inode to be removed 981 * @inode: The inode to be removed 982 * 983 * Called with all the locks and in a transaction. This will only be 984 * called for a directory after it has been checked to ensure it is empty. 985 * 986 * Returns: 0 on success, or an error 987 */ 988 989 static int gfs2_unlink_inode(struct gfs2_inode *dip, 990 const struct dentry *dentry, 991 struct buffer_head *bh) 992 { 993 struct inode *inode = dentry->d_inode; 994 struct gfs2_inode *ip = GFS2_I(inode); 995 int error; 996 997 error = gfs2_dir_del(dip, dentry); 998 if (error) 999 return error; 1000 1001 ip->i_entries = 0; 1002 inode->i_ctime = CURRENT_TIME; 1003 if (S_ISDIR(inode->i_mode)) 1004 clear_nlink(inode); 1005 else 1006 drop_nlink(inode); 1007 mark_inode_dirty(inode); 1008 if (inode->i_nlink == 0) 1009 gfs2_unlink_di(inode); 1010 return 0; 1011 } 1012 1013 1014 /** 1015 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1016 * @dir: The inode of the directory containing the inode to unlink 1017 * @dentry: The file itself 1018 * 1019 * This routine uses the type of the inode as a flag to figure out 1020 * whether this is an unlink or an rmdir. 1021 * 1022 * Returns: errno 1023 */ 1024 1025 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1026 { 1027 struct gfs2_inode *dip = GFS2_I(dir); 1028 struct gfs2_sbd *sdp = GFS2_SB(dir); 1029 struct inode *inode = dentry->d_inode; 1030 struct gfs2_inode *ip = GFS2_I(inode); 1031 struct buffer_head *bh; 1032 struct gfs2_holder ghs[3]; 1033 struct gfs2_rgrpd *rgd; 1034 int error = -EROFS; 1035 1036 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1037 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1038 1039 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1040 if (!rgd) 1041 goto out_inodes; 1042 1043 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1044 1045 1046 error = gfs2_glock_nq(ghs); /* parent */ 1047 if (error) 1048 goto out_parent; 1049 1050 error = gfs2_glock_nq(ghs + 1); /* child */ 1051 if (error) 1052 goto out_child; 1053 1054 error = -ENOENT; 1055 if (inode->i_nlink == 0) 1056 goto out_rgrp; 1057 1058 if (S_ISDIR(inode->i_mode)) { 1059 error = -ENOTEMPTY; 1060 if (ip->i_entries > 2 || inode->i_nlink > 2) 1061 goto out_rgrp; 1062 } 1063 1064 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1065 if (error) 1066 goto out_rgrp; 1067 1068 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1069 if (error) 1070 goto out_gunlock; 1071 1072 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1073 if (error) 1074 goto out_gunlock; 1075 1076 error = gfs2_meta_inode_buffer(ip, &bh); 1077 if (error) 1078 goto out_end_trans; 1079 1080 error = gfs2_unlink_inode(dip, dentry, bh); 1081 brelse(bh); 1082 1083 out_end_trans: 1084 gfs2_trans_end(sdp); 1085 out_gunlock: 1086 gfs2_glock_dq(ghs + 2); 1087 out_rgrp: 1088 gfs2_glock_dq(ghs + 1); 1089 out_child: 1090 gfs2_glock_dq(ghs); 1091 out_parent: 1092 gfs2_holder_uninit(ghs + 2); 1093 out_inodes: 1094 gfs2_holder_uninit(ghs + 1); 1095 gfs2_holder_uninit(ghs); 1096 return error; 1097 } 1098 1099 /** 1100 * gfs2_symlink - Create a symlink 1101 * @dir: The directory to create the symlink in 1102 * @dentry: The dentry to put the symlink in 1103 * @symname: The thing which the link points to 1104 * 1105 * Returns: errno 1106 */ 1107 1108 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1109 const char *symname) 1110 { 1111 struct gfs2_sbd *sdp = GFS2_SB(dir); 1112 unsigned int size; 1113 1114 size = strlen(symname); 1115 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1116 return -ENAMETOOLONG; 1117 1118 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1119 } 1120 1121 /** 1122 * gfs2_mkdir - Make a directory 1123 * @dir: The parent directory of the new one 1124 * @dentry: The dentry of the new directory 1125 * @mode: The mode of the new directory 1126 * 1127 * Returns: errno 1128 */ 1129 1130 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1131 { 1132 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0); 1133 } 1134 1135 /** 1136 * gfs2_mknod - Make a special file 1137 * @dir: The directory in which the special file will reside 1138 * @dentry: The dentry of the special file 1139 * @mode: The mode of the special file 1140 * @dev: The device specification of the special file 1141 * 1142 */ 1143 1144 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1145 dev_t dev) 1146 { 1147 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); 1148 } 1149 1150 /* 1151 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1152 * @this: move this 1153 * @to: to here 1154 * 1155 * Follow @to back to the root and make sure we don't encounter @this 1156 * Assumes we already hold the rename lock. 1157 * 1158 * Returns: errno 1159 */ 1160 1161 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1162 { 1163 struct inode *dir = &to->i_inode; 1164 struct super_block *sb = dir->i_sb; 1165 struct inode *tmp; 1166 int error = 0; 1167 1168 igrab(dir); 1169 1170 for (;;) { 1171 if (dir == &this->i_inode) { 1172 error = -EINVAL; 1173 break; 1174 } 1175 if (dir == sb->s_root->d_inode) { 1176 error = 0; 1177 break; 1178 } 1179 1180 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1181 if (IS_ERR(tmp)) { 1182 error = PTR_ERR(tmp); 1183 break; 1184 } 1185 1186 iput(dir); 1187 dir = tmp; 1188 } 1189 1190 iput(dir); 1191 1192 return error; 1193 } 1194 1195 /** 1196 * gfs2_rename - Rename a file 1197 * @odir: Parent directory of old file name 1198 * @odentry: The old dentry of the file 1199 * @ndir: Parent directory of new file name 1200 * @ndentry: The new dentry of the file 1201 * 1202 * Returns: errno 1203 */ 1204 1205 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1206 struct inode *ndir, struct dentry *ndentry) 1207 { 1208 struct gfs2_inode *odip = GFS2_I(odir); 1209 struct gfs2_inode *ndip = GFS2_I(ndir); 1210 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1211 struct gfs2_inode *nip = NULL; 1212 struct gfs2_sbd *sdp = GFS2_SB(odir); 1213 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1214 struct gfs2_rgrpd *nrgd; 1215 unsigned int num_gh; 1216 int dir_rename = 0; 1217 int alloc_required = 0; 1218 unsigned int x; 1219 int error; 1220 1221 if (ndentry->d_inode) { 1222 nip = GFS2_I(ndentry->d_inode); 1223 if (ip == nip) 1224 return 0; 1225 } 1226 1227 if (odip != ndip) { 1228 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1229 0, &r_gh); 1230 if (error) 1231 goto out; 1232 1233 if (S_ISDIR(ip->i_inode.i_mode)) { 1234 dir_rename = 1; 1235 /* don't move a dirctory into it's subdir */ 1236 error = gfs2_ok_to_move(ip, ndip); 1237 if (error) 1238 goto out_gunlock_r; 1239 } 1240 } 1241 1242 num_gh = 1; 1243 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1244 if (odip != ndip) { 1245 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1246 num_gh++; 1247 } 1248 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1249 num_gh++; 1250 1251 if (nip) { 1252 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1253 num_gh++; 1254 /* grab the resource lock for unlink flag twiddling 1255 * this is the case of the target file already existing 1256 * so we unlink before doing the rename 1257 */ 1258 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1259 if (nrgd) 1260 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1261 } 1262 1263 for (x = 0; x < num_gh; x++) { 1264 error = gfs2_glock_nq(ghs + x); 1265 if (error) 1266 goto out_gunlock; 1267 } 1268 1269 error = -ENOENT; 1270 if (ip->i_inode.i_nlink == 0) 1271 goto out_gunlock; 1272 1273 /* Check out the old directory */ 1274 1275 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1276 if (error) 1277 goto out_gunlock; 1278 1279 /* Check out the new directory */ 1280 1281 if (nip) { 1282 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1283 if (error) 1284 goto out_gunlock; 1285 1286 if (nip->i_inode.i_nlink == 0) { 1287 error = -EAGAIN; 1288 goto out_gunlock; 1289 } 1290 1291 if (S_ISDIR(nip->i_inode.i_mode)) { 1292 if (nip->i_entries < 2) { 1293 gfs2_consist_inode(nip); 1294 error = -EIO; 1295 goto out_gunlock; 1296 } 1297 if (nip->i_entries > 2) { 1298 error = -ENOTEMPTY; 1299 goto out_gunlock; 1300 } 1301 } 1302 } else { 1303 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1304 if (error) 1305 goto out_gunlock; 1306 1307 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1308 switch (error) { 1309 case -ENOENT: 1310 error = 0; 1311 break; 1312 case 0: 1313 error = -EEXIST; 1314 default: 1315 goto out_gunlock; 1316 }; 1317 1318 if (odip != ndip) { 1319 if (!ndip->i_inode.i_nlink) { 1320 error = -ENOENT; 1321 goto out_gunlock; 1322 } 1323 if (ndip->i_entries == (u32)-1) { 1324 error = -EFBIG; 1325 goto out_gunlock; 1326 } 1327 if (S_ISDIR(ip->i_inode.i_mode) && 1328 ndip->i_inode.i_nlink == (u32)-1) { 1329 error = -EMLINK; 1330 goto out_gunlock; 1331 } 1332 } 1333 } 1334 1335 /* Check out the dir to be renamed */ 1336 1337 if (dir_rename) { 1338 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1339 if (error) 1340 goto out_gunlock; 1341 } 1342 1343 if (nip == NULL) 1344 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1345 error = alloc_required; 1346 if (error < 0) 1347 goto out_gunlock; 1348 error = 0; 1349 1350 if (alloc_required) { 1351 struct gfs2_qadata *qa = gfs2_qadata_get(ndip); 1352 1353 if (!qa) { 1354 error = -ENOMEM; 1355 goto out_gunlock; 1356 } 1357 1358 error = gfs2_quota_lock_check(ndip); 1359 if (error) 1360 goto out_alloc; 1361 1362 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres); 1363 if (error) 1364 goto out_gunlock_q; 1365 1366 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1367 gfs2_rg_blocks(ndip) + 1368 4 * RES_DINODE + 4 * RES_LEAF + 1369 RES_STATFS + RES_QUOTA + 4, 0); 1370 if (error) 1371 goto out_ipreserv; 1372 } else { 1373 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1374 5 * RES_LEAF + 4, 0); 1375 if (error) 1376 goto out_gunlock; 1377 } 1378 1379 /* Remove the target file, if it exists */ 1380 1381 if (nip) { 1382 struct buffer_head *bh; 1383 error = gfs2_meta_inode_buffer(nip, &bh); 1384 if (error) 1385 goto out_end_trans; 1386 error = gfs2_unlink_inode(ndip, ndentry, bh); 1387 brelse(bh); 1388 } 1389 1390 if (dir_rename) { 1391 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1392 if (error) 1393 goto out_end_trans; 1394 } else { 1395 struct buffer_head *dibh; 1396 error = gfs2_meta_inode_buffer(ip, &dibh); 1397 if (error) 1398 goto out_end_trans; 1399 ip->i_inode.i_ctime = CURRENT_TIME; 1400 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1401 gfs2_dinode_out(ip, dibh->b_data); 1402 brelse(dibh); 1403 } 1404 1405 error = gfs2_dir_del(odip, odentry); 1406 if (error) 1407 goto out_end_trans; 1408 1409 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1410 if (error) 1411 goto out_end_trans; 1412 1413 out_end_trans: 1414 gfs2_trans_end(sdp); 1415 out_ipreserv: 1416 if (alloc_required) 1417 gfs2_inplace_release(ndip); 1418 out_gunlock_q: 1419 if (alloc_required) 1420 gfs2_quota_unlock(ndip); 1421 out_alloc: 1422 if (alloc_required) 1423 gfs2_qadata_put(ndip); 1424 out_gunlock: 1425 while (x--) { 1426 gfs2_glock_dq(ghs + x); 1427 gfs2_holder_uninit(ghs + x); 1428 } 1429 out_gunlock_r: 1430 if (r_gh.gh_gl) 1431 gfs2_glock_dq_uninit(&r_gh); 1432 out: 1433 return error; 1434 } 1435 1436 /** 1437 * gfs2_follow_link - Follow a symbolic link 1438 * @dentry: The dentry of the link 1439 * @nd: Data that we pass to vfs_follow_link() 1440 * 1441 * This can handle symlinks of any size. 1442 * 1443 * Returns: 0 on success or error code 1444 */ 1445 1446 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1447 { 1448 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1449 struct gfs2_holder i_gh; 1450 struct buffer_head *dibh; 1451 unsigned int size; 1452 char *buf; 1453 int error; 1454 1455 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1456 error = gfs2_glock_nq(&i_gh); 1457 if (error) { 1458 gfs2_holder_uninit(&i_gh); 1459 nd_set_link(nd, ERR_PTR(error)); 1460 return NULL; 1461 } 1462 1463 size = (unsigned int)i_size_read(&ip->i_inode); 1464 if (size == 0) { 1465 gfs2_consist_inode(ip); 1466 buf = ERR_PTR(-EIO); 1467 goto out; 1468 } 1469 1470 error = gfs2_meta_inode_buffer(ip, &dibh); 1471 if (error) { 1472 buf = ERR_PTR(error); 1473 goto out; 1474 } 1475 1476 buf = kzalloc(size + 1, GFP_NOFS); 1477 if (!buf) 1478 buf = ERR_PTR(-ENOMEM); 1479 else 1480 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1481 brelse(dibh); 1482 out: 1483 gfs2_glock_dq_uninit(&i_gh); 1484 nd_set_link(nd, buf); 1485 return NULL; 1486 } 1487 1488 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1489 { 1490 char *s = nd_get_link(nd); 1491 if (!IS_ERR(s)) 1492 kfree(s); 1493 } 1494 1495 /** 1496 * gfs2_permission - 1497 * @inode: The inode 1498 * @mask: The mask to be tested 1499 * @flags: Indicates whether this is an RCU path walk or not 1500 * 1501 * This may be called from the VFS directly, or from within GFS2 with the 1502 * inode locked, so we look to see if the glock is already locked and only 1503 * lock the glock if its not already been done. 1504 * 1505 * Returns: errno 1506 */ 1507 1508 int gfs2_permission(struct inode *inode, int mask) 1509 { 1510 struct gfs2_inode *ip; 1511 struct gfs2_holder i_gh; 1512 int error; 1513 int unlock = 0; 1514 1515 1516 ip = GFS2_I(inode); 1517 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1518 if (mask & MAY_NOT_BLOCK) 1519 return -ECHILD; 1520 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1521 if (error) 1522 return error; 1523 unlock = 1; 1524 } 1525 1526 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1527 error = -EACCES; 1528 else 1529 error = generic_permission(inode, mask); 1530 if (unlock) 1531 gfs2_glock_dq_uninit(&i_gh); 1532 1533 return error; 1534 } 1535 1536 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1537 { 1538 setattr_copy(inode, attr); 1539 mark_inode_dirty(inode); 1540 return 0; 1541 } 1542 1543 /** 1544 * gfs2_setattr_simple - 1545 * @ip: 1546 * @attr: 1547 * 1548 * Returns: errno 1549 */ 1550 1551 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1552 { 1553 int error; 1554 1555 if (current->journal_info) 1556 return __gfs2_setattr_simple(inode, attr); 1557 1558 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1559 if (error) 1560 return error; 1561 1562 error = __gfs2_setattr_simple(inode, attr); 1563 gfs2_trans_end(GFS2_SB(inode)); 1564 return error; 1565 } 1566 1567 static int setattr_chown(struct inode *inode, struct iattr *attr) 1568 { 1569 struct gfs2_inode *ip = GFS2_I(inode); 1570 struct gfs2_sbd *sdp = GFS2_SB(inode); 1571 u32 ouid, ogid, nuid, ngid; 1572 int error; 1573 1574 ouid = inode->i_uid; 1575 ogid = inode->i_gid; 1576 nuid = attr->ia_uid; 1577 ngid = attr->ia_gid; 1578 1579 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) 1580 ouid = nuid = NO_QUOTA_CHANGE; 1581 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) 1582 ogid = ngid = NO_QUOTA_CHANGE; 1583 1584 if (!gfs2_qadata_get(ip)) 1585 return -ENOMEM; 1586 1587 error = gfs2_quota_lock(ip, nuid, ngid); 1588 if (error) 1589 goto out_alloc; 1590 1591 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1592 error = gfs2_quota_check(ip, nuid, ngid); 1593 if (error) 1594 goto out_gunlock_q; 1595 } 1596 1597 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1598 if (error) 1599 goto out_gunlock_q; 1600 1601 error = gfs2_setattr_simple(inode, attr); 1602 if (error) 1603 goto out_end_trans; 1604 1605 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1606 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1607 gfs2_quota_change(ip, -blocks, ouid, ogid); 1608 gfs2_quota_change(ip, blocks, nuid, ngid); 1609 } 1610 1611 out_end_trans: 1612 gfs2_trans_end(sdp); 1613 out_gunlock_q: 1614 gfs2_quota_unlock(ip); 1615 out_alloc: 1616 gfs2_qadata_put(ip); 1617 return error; 1618 } 1619 1620 /** 1621 * gfs2_setattr - Change attributes on an inode 1622 * @dentry: The dentry which is changing 1623 * @attr: The structure describing the change 1624 * 1625 * The VFS layer wants to change one or more of an inodes attributes. Write 1626 * that change out to disk. 1627 * 1628 * Returns: errno 1629 */ 1630 1631 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1632 { 1633 struct inode *inode = dentry->d_inode; 1634 struct gfs2_inode *ip = GFS2_I(inode); 1635 struct gfs2_holder i_gh; 1636 int error; 1637 1638 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1639 if (error) 1640 return error; 1641 1642 error = -EPERM; 1643 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1644 goto out; 1645 1646 error = inode_change_ok(inode, attr); 1647 if (error) 1648 goto out; 1649 1650 if (attr->ia_valid & ATTR_SIZE) 1651 error = gfs2_setattr_size(inode, attr->ia_size); 1652 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1653 error = setattr_chown(inode, attr); 1654 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1655 error = gfs2_acl_chmod(ip, attr); 1656 else 1657 error = gfs2_setattr_simple(inode, attr); 1658 1659 out: 1660 if (!error) 1661 mark_inode_dirty(inode); 1662 gfs2_glock_dq_uninit(&i_gh); 1663 return error; 1664 } 1665 1666 /** 1667 * gfs2_getattr - Read out an inode's attributes 1668 * @mnt: The vfsmount the inode is being accessed from 1669 * @dentry: The dentry to stat 1670 * @stat: The inode's stats 1671 * 1672 * This may be called from the VFS directly, or from within GFS2 with the 1673 * inode locked, so we look to see if the glock is already locked and only 1674 * lock the glock if its not already been done. Note that its the NFS 1675 * readdirplus operation which causes this to be called (from filldir) 1676 * with the glock already held. 1677 * 1678 * Returns: errno 1679 */ 1680 1681 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1682 struct kstat *stat) 1683 { 1684 struct inode *inode = dentry->d_inode; 1685 struct gfs2_inode *ip = GFS2_I(inode); 1686 struct gfs2_holder gh; 1687 int error; 1688 int unlock = 0; 1689 1690 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1691 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1692 if (error) 1693 return error; 1694 unlock = 1; 1695 } 1696 1697 generic_fillattr(inode, stat); 1698 if (unlock) 1699 gfs2_glock_dq_uninit(&gh); 1700 1701 return 0; 1702 } 1703 1704 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1705 const void *data, size_t size, int flags) 1706 { 1707 struct inode *inode = dentry->d_inode; 1708 struct gfs2_inode *ip = GFS2_I(inode); 1709 struct gfs2_holder gh; 1710 int ret; 1711 1712 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1713 ret = gfs2_glock_nq(&gh); 1714 if (ret == 0) { 1715 ret = generic_setxattr(dentry, name, data, size, flags); 1716 gfs2_glock_dq(&gh); 1717 } 1718 gfs2_holder_uninit(&gh); 1719 return ret; 1720 } 1721 1722 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1723 void *data, size_t size) 1724 { 1725 struct inode *inode = dentry->d_inode; 1726 struct gfs2_inode *ip = GFS2_I(inode); 1727 struct gfs2_holder gh; 1728 int ret; 1729 1730 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1731 ret = gfs2_glock_nq(&gh); 1732 if (ret == 0) { 1733 ret = generic_getxattr(dentry, name, data, size); 1734 gfs2_glock_dq(&gh); 1735 } 1736 gfs2_holder_uninit(&gh); 1737 return ret; 1738 } 1739 1740 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1741 { 1742 struct inode *inode = dentry->d_inode; 1743 struct gfs2_inode *ip = GFS2_I(inode); 1744 struct gfs2_holder gh; 1745 int ret; 1746 1747 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1748 ret = gfs2_glock_nq(&gh); 1749 if (ret == 0) { 1750 ret = generic_removexattr(dentry, name); 1751 gfs2_glock_dq(&gh); 1752 } 1753 gfs2_holder_uninit(&gh); 1754 return ret; 1755 } 1756 1757 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1758 u64 start, u64 len) 1759 { 1760 struct gfs2_inode *ip = GFS2_I(inode); 1761 struct gfs2_holder gh; 1762 int ret; 1763 1764 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1765 if (ret) 1766 return ret; 1767 1768 mutex_lock(&inode->i_mutex); 1769 1770 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1771 if (ret) 1772 goto out; 1773 1774 if (gfs2_is_stuffed(ip)) { 1775 u64 phys = ip->i_no_addr << inode->i_blkbits; 1776 u64 size = i_size_read(inode); 1777 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1778 FIEMAP_EXTENT_DATA_INLINE; 1779 phys += sizeof(struct gfs2_dinode); 1780 phys += start; 1781 if (start + len > size) 1782 len = size - start; 1783 if (start < size) 1784 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1785 len, flags); 1786 if (ret == 1) 1787 ret = 0; 1788 } else { 1789 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1790 gfs2_block_map); 1791 } 1792 1793 gfs2_glock_dq_uninit(&gh); 1794 out: 1795 mutex_unlock(&inode->i_mutex); 1796 return ret; 1797 } 1798 1799 const struct inode_operations gfs2_file_iops = { 1800 .permission = gfs2_permission, 1801 .setattr = gfs2_setattr, 1802 .getattr = gfs2_getattr, 1803 .setxattr = gfs2_setxattr, 1804 .getxattr = gfs2_getxattr, 1805 .listxattr = gfs2_listxattr, 1806 .removexattr = gfs2_removexattr, 1807 .fiemap = gfs2_fiemap, 1808 .get_acl = gfs2_get_acl, 1809 }; 1810 1811 const struct inode_operations gfs2_dir_iops = { 1812 .create = gfs2_create, 1813 .lookup = gfs2_lookup, 1814 .link = gfs2_link, 1815 .unlink = gfs2_unlink, 1816 .symlink = gfs2_symlink, 1817 .mkdir = gfs2_mkdir, 1818 .rmdir = gfs2_unlink, 1819 .mknod = gfs2_mknod, 1820 .rename = gfs2_rename, 1821 .permission = gfs2_permission, 1822 .setattr = gfs2_setattr, 1823 .getattr = gfs2_getattr, 1824 .setxattr = gfs2_setxattr, 1825 .getxattr = gfs2_getxattr, 1826 .listxattr = gfs2_listxattr, 1827 .removexattr = gfs2_removexattr, 1828 .fiemap = gfs2_fiemap, 1829 .get_acl = gfs2_get_acl, 1830 }; 1831 1832 const struct inode_operations gfs2_symlink_iops = { 1833 .readlink = generic_readlink, 1834 .follow_link = gfs2_follow_link, 1835 .put_link = gfs2_put_link, 1836 .permission = gfs2_permission, 1837 .setattr = gfs2_setattr, 1838 .getattr = gfs2_getattr, 1839 .setxattr = gfs2_setxattr, 1840 .getxattr = gfs2_getxattr, 1841 .listxattr = gfs2_listxattr, 1842 .removexattr = gfs2_removexattr, 1843 .fiemap = gfs2_fiemap, 1844 .get_acl = gfs2_get_acl, 1845 }; 1846 1847