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_rindex_update(sdp); 395 if (error) 396 fs_warn(sdp, "rindex update returns %d\n", error); 397 398 error = gfs2_inplace_reserve(dip, RES_DINODE); 399 if (error) 400 goto out; 401 402 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 403 if (error) 404 goto out_ipreserv; 405 406 error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation); 407 408 gfs2_trans_end(sdp); 409 410 out_ipreserv: 411 gfs2_inplace_release(dip); 412 out: 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, umode_t 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 umode_t 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_qadata_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_qadata_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_qadata *qa; 559 int alloc_required; 560 struct buffer_head *dibh; 561 int error; 562 563 qa = gfs2_qadata_get(dip); 564 if (!qa) 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 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); 580 if (error) 581 goto fail_quota_locks; 582 583 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 584 dip->i_rgd->rd_length + 585 2 * RES_DINODE + 586 RES_STATFS + RES_QUOTA, 0); 587 if (error) 588 goto fail_ipreserv; 589 } else { 590 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 591 if (error) 592 goto fail_quota_locks; 593 } 594 595 error = gfs2_dir_add(&dip->i_inode, name, ip); 596 if (error) 597 goto fail_end_trans; 598 599 error = gfs2_meta_inode_buffer(ip, &dibh); 600 if (error) 601 goto fail_end_trans; 602 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); 603 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 604 gfs2_dinode_out(ip, dibh->b_data); 605 brelse(dibh); 606 return 0; 607 608 fail_end_trans: 609 gfs2_trans_end(sdp); 610 611 fail_ipreserv: 612 gfs2_inplace_release(dip); 613 614 fail_quota_locks: 615 gfs2_quota_unlock(dip); 616 617 fail: 618 gfs2_qadata_put(dip); 619 return error; 620 } 621 622 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 623 void *fs_info) 624 { 625 const struct xattr *xattr; 626 int err = 0; 627 628 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 629 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 630 xattr->value_len, 0, 631 GFS2_EATYPE_SECURITY); 632 if (err < 0) 633 break; 634 } 635 return err; 636 } 637 638 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 639 const struct qstr *qstr) 640 { 641 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 642 &gfs2_initxattrs, NULL); 643 } 644 645 /** 646 * gfs2_create_inode - Create a new inode 647 * @dir: The parent directory 648 * @dentry: The new dentry 649 * @mode: The permissions on the new inode 650 * @dev: For device nodes, this is the device number 651 * @symname: For symlinks, this is the link destination 652 * @size: The initial size of the inode (ignored for directories) 653 * 654 * Returns: 0 on success, or error code 655 */ 656 657 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 658 umode_t mode, dev_t dev, const char *symname, 659 unsigned int size, int excl) 660 { 661 const struct qstr *name = &dentry->d_name; 662 struct gfs2_holder ghs[2]; 663 struct inode *inode = NULL; 664 struct gfs2_inode *dip = GFS2_I(dir); 665 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 666 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; 667 int error; 668 u64 generation; 669 struct buffer_head *bh = NULL; 670 671 if (!name->len || name->len > GFS2_FNAMESIZE) 672 return -ENAMETOOLONG; 673 674 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 675 if (error) 676 goto fail; 677 678 error = create_ok(dip, name, mode); 679 if ((error == -EEXIST) && S_ISREG(mode) && !excl) { 680 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 681 gfs2_glock_dq_uninit(ghs); 682 d_instantiate(dentry, inode); 683 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 684 } 685 if (error) 686 goto fail_gunlock; 687 688 error = alloc_dinode(dip, &inum.no_addr, &generation); 689 if (error) 690 goto fail_gunlock; 691 inum.no_formal_ino = generation; 692 693 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, 694 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 695 if (error) 696 goto fail_gunlock; 697 698 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh); 699 if (error) 700 goto fail_gunlock2; 701 702 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, 703 inum.no_formal_ino, 0); 704 if (IS_ERR(inode)) 705 goto fail_gunlock2; 706 707 error = gfs2_inode_refresh(GFS2_I(inode)); 708 if (error) 709 goto fail_gunlock2; 710 711 error = gfs2_acl_create(dip, inode); 712 if (error) 713 goto fail_gunlock2; 714 715 error = gfs2_security_init(dip, GFS2_I(inode), name); 716 if (error) 717 goto fail_gunlock2; 718 719 error = link_dinode(dip, name, GFS2_I(inode)); 720 if (error) 721 goto fail_gunlock2; 722 723 if (bh) 724 brelse(bh); 725 726 gfs2_trans_end(sdp); 727 /* Check if we reserved space in the rgrp. Function link_dinode may 728 not, depending on whether alloc is required. */ 729 if (dip->i_res) 730 gfs2_inplace_release(dip); 731 gfs2_quota_unlock(dip); 732 gfs2_qadata_put(dip); 733 mark_inode_dirty(inode); 734 gfs2_glock_dq_uninit_m(2, ghs); 735 d_instantiate(dentry, inode); 736 return 0; 737 738 fail_gunlock2: 739 gfs2_glock_dq_uninit(ghs + 1); 740 fail_gunlock: 741 gfs2_glock_dq_uninit(ghs); 742 if (inode && !IS_ERR(inode)) { 743 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 744 iput(inode); 745 } 746 fail: 747 if (bh) 748 brelse(bh); 749 return error; 750 } 751 752 /** 753 * gfs2_create - Create a file 754 * @dir: The directory in which to create the file 755 * @dentry: The dentry of the new file 756 * @mode: The mode of the new file 757 * 758 * Returns: errno 759 */ 760 761 static int gfs2_create(struct inode *dir, struct dentry *dentry, 762 umode_t mode, struct nameidata *nd) 763 { 764 int excl = 0; 765 if (nd && (nd->flags & LOOKUP_EXCL)) 766 excl = 1; 767 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); 768 } 769 770 /** 771 * gfs2_lookup - Look up a filename in a directory and return its inode 772 * @dir: The directory inode 773 * @dentry: The dentry of the new inode 774 * @nd: passed from Linux VFS, ignored by us 775 * 776 * Called by the VFS layer. Lock dir and call gfs2_lookupi() 777 * 778 * Returns: errno 779 */ 780 781 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 782 struct nameidata *nd) 783 { 784 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); 785 if (inode && !IS_ERR(inode)) { 786 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 787 struct gfs2_holder gh; 788 int error; 789 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 790 if (error) { 791 iput(inode); 792 return ERR_PTR(error); 793 } 794 gfs2_glock_dq_uninit(&gh); 795 } 796 return d_splice_alias(inode, dentry); 797 } 798 799 /** 800 * gfs2_link - Link to a file 801 * @old_dentry: The inode to link 802 * @dir: Add link to this directory 803 * @dentry: The name of the link 804 * 805 * Link the inode in "old_dentry" into the directory "dir" with the 806 * name in "dentry". 807 * 808 * Returns: errno 809 */ 810 811 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 812 struct dentry *dentry) 813 { 814 struct gfs2_inode *dip = GFS2_I(dir); 815 struct gfs2_sbd *sdp = GFS2_SB(dir); 816 struct inode *inode = old_dentry->d_inode; 817 struct gfs2_inode *ip = GFS2_I(inode); 818 struct gfs2_holder ghs[2]; 819 struct buffer_head *dibh; 820 int alloc_required; 821 int error; 822 823 if (S_ISDIR(inode->i_mode)) 824 return -EPERM; 825 826 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 827 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 828 829 error = gfs2_glock_nq(ghs); /* parent */ 830 if (error) 831 goto out_parent; 832 833 error = gfs2_glock_nq(ghs + 1); /* child */ 834 if (error) 835 goto out_child; 836 837 error = -ENOENT; 838 if (inode->i_nlink == 0) 839 goto out_gunlock; 840 841 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 842 if (error) 843 goto out_gunlock; 844 845 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 846 switch (error) { 847 case -ENOENT: 848 break; 849 case 0: 850 error = -EEXIST; 851 default: 852 goto out_gunlock; 853 } 854 855 error = -EINVAL; 856 if (!dip->i_inode.i_nlink) 857 goto out_gunlock; 858 error = -EFBIG; 859 if (dip->i_entries == (u32)-1) 860 goto out_gunlock; 861 error = -EPERM; 862 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 863 goto out_gunlock; 864 error = -EINVAL; 865 if (!ip->i_inode.i_nlink) 866 goto out_gunlock; 867 error = -EMLINK; 868 if (ip->i_inode.i_nlink == (u32)-1) 869 goto out_gunlock; 870 871 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 872 if (error < 0) 873 goto out_gunlock; 874 error = 0; 875 876 if (alloc_required) { 877 struct gfs2_qadata *qa = gfs2_qadata_get(dip); 878 879 if (!qa) { 880 error = -ENOMEM; 881 goto out_gunlock; 882 } 883 884 error = gfs2_quota_lock_check(dip); 885 if (error) 886 goto out_alloc; 887 888 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); 889 if (error) 890 goto out_gunlock_q; 891 892 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 893 gfs2_rg_blocks(dip) + 894 2 * RES_DINODE + RES_STATFS + 895 RES_QUOTA, 0); 896 if (error) 897 goto out_ipres; 898 } else { 899 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 900 if (error) 901 goto out_ipres; 902 } 903 904 error = gfs2_meta_inode_buffer(ip, &dibh); 905 if (error) 906 goto out_end_trans; 907 908 error = gfs2_dir_add(dir, &dentry->d_name, ip); 909 if (error) 910 goto out_brelse; 911 912 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 913 inc_nlink(&ip->i_inode); 914 ip->i_inode.i_ctime = CURRENT_TIME; 915 ihold(inode); 916 d_instantiate(dentry, inode); 917 mark_inode_dirty(inode); 918 919 out_brelse: 920 brelse(dibh); 921 out_end_trans: 922 gfs2_trans_end(sdp); 923 out_ipres: 924 if (alloc_required) 925 gfs2_inplace_release(dip); 926 out_gunlock_q: 927 if (alloc_required) 928 gfs2_quota_unlock(dip); 929 out_alloc: 930 if (alloc_required) 931 gfs2_qadata_put(dip); 932 out_gunlock: 933 gfs2_glock_dq(ghs + 1); 934 out_child: 935 gfs2_glock_dq(ghs); 936 out_parent: 937 gfs2_holder_uninit(ghs); 938 gfs2_holder_uninit(ghs + 1); 939 return error; 940 } 941 942 /* 943 * gfs2_unlink_ok - check to see that a inode is still in a directory 944 * @dip: the directory 945 * @name: the name of the file 946 * @ip: the inode 947 * 948 * Assumes that the lock on (at least) @dip is held. 949 * 950 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 951 */ 952 953 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 954 const struct gfs2_inode *ip) 955 { 956 int error; 957 958 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 959 return -EPERM; 960 961 if ((dip->i_inode.i_mode & S_ISVTX) && 962 dip->i_inode.i_uid != current_fsuid() && 963 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) 964 return -EPERM; 965 966 if (IS_APPEND(&dip->i_inode)) 967 return -EPERM; 968 969 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 970 if (error) 971 return error; 972 973 error = gfs2_dir_check(&dip->i_inode, name, ip); 974 if (error) 975 return error; 976 977 return 0; 978 } 979 980 /** 981 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 982 * @dip: The parent directory 983 * @name: The name of the entry in the parent directory 984 * @bh: The inode buffer for the inode to be removed 985 * @inode: The inode to be removed 986 * 987 * Called with all the locks and in a transaction. This will only be 988 * called for a directory after it has been checked to ensure it is empty. 989 * 990 * Returns: 0 on success, or an error 991 */ 992 993 static int gfs2_unlink_inode(struct gfs2_inode *dip, 994 const struct dentry *dentry, 995 struct buffer_head *bh) 996 { 997 struct inode *inode = dentry->d_inode; 998 struct gfs2_inode *ip = GFS2_I(inode); 999 int error; 1000 1001 error = gfs2_dir_del(dip, dentry); 1002 if (error) 1003 return error; 1004 1005 ip->i_entries = 0; 1006 inode->i_ctime = CURRENT_TIME; 1007 if (S_ISDIR(inode->i_mode)) 1008 clear_nlink(inode); 1009 else 1010 drop_nlink(inode); 1011 mark_inode_dirty(inode); 1012 if (inode->i_nlink == 0) 1013 gfs2_unlink_di(inode); 1014 return 0; 1015 } 1016 1017 1018 /** 1019 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1020 * @dir: The inode of the directory containing the inode to unlink 1021 * @dentry: The file itself 1022 * 1023 * This routine uses the type of the inode as a flag to figure out 1024 * whether this is an unlink or an rmdir. 1025 * 1026 * Returns: errno 1027 */ 1028 1029 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1030 { 1031 struct gfs2_inode *dip = GFS2_I(dir); 1032 struct gfs2_sbd *sdp = GFS2_SB(dir); 1033 struct inode *inode = dentry->d_inode; 1034 struct gfs2_inode *ip = GFS2_I(inode); 1035 struct buffer_head *bh; 1036 struct gfs2_holder ghs[3]; 1037 struct gfs2_rgrpd *rgd; 1038 int error = -EROFS; 1039 1040 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1041 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1042 1043 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); 1044 if (!rgd) 1045 goto out_inodes; 1046 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1047 1048 1049 error = gfs2_glock_nq(ghs); /* parent */ 1050 if (error) 1051 goto out_parent; 1052 1053 error = gfs2_glock_nq(ghs + 1); /* child */ 1054 if (error) 1055 goto out_child; 1056 1057 error = -ENOENT; 1058 if (inode->i_nlink == 0) 1059 goto out_rgrp; 1060 1061 if (S_ISDIR(inode->i_mode)) { 1062 error = -ENOTEMPTY; 1063 if (ip->i_entries > 2 || inode->i_nlink > 2) 1064 goto out_rgrp; 1065 } 1066 1067 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1068 if (error) 1069 goto out_rgrp; 1070 1071 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1072 if (error) 1073 goto out_gunlock; 1074 1075 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1076 if (error) 1077 goto out_gunlock; 1078 1079 error = gfs2_meta_inode_buffer(ip, &bh); 1080 if (error) 1081 goto out_end_trans; 1082 1083 error = gfs2_unlink_inode(dip, dentry, bh); 1084 brelse(bh); 1085 1086 out_end_trans: 1087 gfs2_trans_end(sdp); 1088 out_gunlock: 1089 gfs2_glock_dq(ghs + 2); 1090 out_rgrp: 1091 gfs2_glock_dq(ghs + 1); 1092 out_child: 1093 gfs2_glock_dq(ghs); 1094 out_parent: 1095 gfs2_holder_uninit(ghs + 2); 1096 out_inodes: 1097 gfs2_holder_uninit(ghs + 1); 1098 gfs2_holder_uninit(ghs); 1099 return error; 1100 } 1101 1102 /** 1103 * gfs2_symlink - Create a symlink 1104 * @dir: The directory to create the symlink in 1105 * @dentry: The dentry to put the symlink in 1106 * @symname: The thing which the link points to 1107 * 1108 * Returns: errno 1109 */ 1110 1111 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1112 const char *symname) 1113 { 1114 struct gfs2_sbd *sdp = GFS2_SB(dir); 1115 unsigned int size; 1116 1117 size = strlen(symname); 1118 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1119 return -ENAMETOOLONG; 1120 1121 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1122 } 1123 1124 /** 1125 * gfs2_mkdir - Make a directory 1126 * @dir: The parent directory of the new one 1127 * @dentry: The dentry of the new directory 1128 * @mode: The mode of the new directory 1129 * 1130 * Returns: errno 1131 */ 1132 1133 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1134 { 1135 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0); 1136 } 1137 1138 /** 1139 * gfs2_mknod - Make a special file 1140 * @dir: The directory in which the special file will reside 1141 * @dentry: The dentry of the special file 1142 * @mode: The mode of the special file 1143 * @dev: The device specification of the special file 1144 * 1145 */ 1146 1147 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1148 dev_t dev) 1149 { 1150 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); 1151 } 1152 1153 /* 1154 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1155 * @this: move this 1156 * @to: to here 1157 * 1158 * Follow @to back to the root and make sure we don't encounter @this 1159 * Assumes we already hold the rename lock. 1160 * 1161 * Returns: errno 1162 */ 1163 1164 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1165 { 1166 struct inode *dir = &to->i_inode; 1167 struct super_block *sb = dir->i_sb; 1168 struct inode *tmp; 1169 int error = 0; 1170 1171 igrab(dir); 1172 1173 for (;;) { 1174 if (dir == &this->i_inode) { 1175 error = -EINVAL; 1176 break; 1177 } 1178 if (dir == sb->s_root->d_inode) { 1179 error = 0; 1180 break; 1181 } 1182 1183 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1184 if (IS_ERR(tmp)) { 1185 error = PTR_ERR(tmp); 1186 break; 1187 } 1188 1189 iput(dir); 1190 dir = tmp; 1191 } 1192 1193 iput(dir); 1194 1195 return error; 1196 } 1197 1198 /** 1199 * gfs2_rename - Rename a file 1200 * @odir: Parent directory of old file name 1201 * @odentry: The old dentry of the file 1202 * @ndir: Parent directory of new file name 1203 * @ndentry: The new dentry of the file 1204 * 1205 * Returns: errno 1206 */ 1207 1208 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1209 struct inode *ndir, struct dentry *ndentry) 1210 { 1211 struct gfs2_inode *odip = GFS2_I(odir); 1212 struct gfs2_inode *ndip = GFS2_I(ndir); 1213 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1214 struct gfs2_inode *nip = NULL; 1215 struct gfs2_sbd *sdp = GFS2_SB(odir); 1216 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1217 struct gfs2_rgrpd *nrgd; 1218 unsigned int num_gh; 1219 int dir_rename = 0; 1220 int alloc_required = 0; 1221 unsigned int x; 1222 int error; 1223 1224 if (ndentry->d_inode) { 1225 nip = GFS2_I(ndentry->d_inode); 1226 if (ip == nip) 1227 return 0; 1228 } 1229 1230 if (odip != ndip) { 1231 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1232 0, &r_gh); 1233 if (error) 1234 goto out; 1235 1236 if (S_ISDIR(ip->i_inode.i_mode)) { 1237 dir_rename = 1; 1238 /* don't move a dirctory into it's subdir */ 1239 error = gfs2_ok_to_move(ip, ndip); 1240 if (error) 1241 goto out_gunlock_r; 1242 } 1243 } 1244 1245 num_gh = 1; 1246 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1247 if (odip != ndip) { 1248 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1249 num_gh++; 1250 } 1251 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1252 num_gh++; 1253 1254 if (nip) { 1255 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1256 num_gh++; 1257 /* grab the resource lock for unlink flag twiddling 1258 * this is the case of the target file already existing 1259 * so we unlink before doing the rename 1260 */ 1261 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); 1262 if (nrgd) 1263 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1264 } 1265 1266 for (x = 0; x < num_gh; x++) { 1267 error = gfs2_glock_nq(ghs + x); 1268 if (error) 1269 goto out_gunlock; 1270 } 1271 1272 error = -ENOENT; 1273 if (ip->i_inode.i_nlink == 0) 1274 goto out_gunlock; 1275 1276 /* Check out the old directory */ 1277 1278 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1279 if (error) 1280 goto out_gunlock; 1281 1282 /* Check out the new directory */ 1283 1284 if (nip) { 1285 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1286 if (error) 1287 goto out_gunlock; 1288 1289 if (nip->i_inode.i_nlink == 0) { 1290 error = -EAGAIN; 1291 goto out_gunlock; 1292 } 1293 1294 if (S_ISDIR(nip->i_inode.i_mode)) { 1295 if (nip->i_entries < 2) { 1296 gfs2_consist_inode(nip); 1297 error = -EIO; 1298 goto out_gunlock; 1299 } 1300 if (nip->i_entries > 2) { 1301 error = -ENOTEMPTY; 1302 goto out_gunlock; 1303 } 1304 } 1305 } else { 1306 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1307 if (error) 1308 goto out_gunlock; 1309 1310 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1311 switch (error) { 1312 case -ENOENT: 1313 error = 0; 1314 break; 1315 case 0: 1316 error = -EEXIST; 1317 default: 1318 goto out_gunlock; 1319 }; 1320 1321 if (odip != ndip) { 1322 if (!ndip->i_inode.i_nlink) { 1323 error = -ENOENT; 1324 goto out_gunlock; 1325 } 1326 if (ndip->i_entries == (u32)-1) { 1327 error = -EFBIG; 1328 goto out_gunlock; 1329 } 1330 if (S_ISDIR(ip->i_inode.i_mode) && 1331 ndip->i_inode.i_nlink == (u32)-1) { 1332 error = -EMLINK; 1333 goto out_gunlock; 1334 } 1335 } 1336 } 1337 1338 /* Check out the dir to be renamed */ 1339 1340 if (dir_rename) { 1341 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1342 if (error) 1343 goto out_gunlock; 1344 } 1345 1346 if (nip == NULL) 1347 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1348 error = alloc_required; 1349 if (error < 0) 1350 goto out_gunlock; 1351 error = 0; 1352 1353 if (alloc_required) { 1354 struct gfs2_qadata *qa = gfs2_qadata_get(ndip); 1355 1356 if (!qa) { 1357 error = -ENOMEM; 1358 goto out_gunlock; 1359 } 1360 1361 error = gfs2_quota_lock_check(ndip); 1362 if (error) 1363 goto out_alloc; 1364 1365 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres); 1366 if (error) 1367 goto out_gunlock_q; 1368 1369 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1370 gfs2_rg_blocks(ndip) + 1371 4 * RES_DINODE + 4 * RES_LEAF + 1372 RES_STATFS + RES_QUOTA + 4, 0); 1373 if (error) 1374 goto out_ipreserv; 1375 } else { 1376 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1377 5 * RES_LEAF + 4, 0); 1378 if (error) 1379 goto out_gunlock; 1380 } 1381 1382 /* Remove the target file, if it exists */ 1383 1384 if (nip) { 1385 struct buffer_head *bh; 1386 error = gfs2_meta_inode_buffer(nip, &bh); 1387 if (error) 1388 goto out_end_trans; 1389 error = gfs2_unlink_inode(ndip, ndentry, bh); 1390 brelse(bh); 1391 } 1392 1393 if (dir_rename) { 1394 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1395 if (error) 1396 goto out_end_trans; 1397 } else { 1398 struct buffer_head *dibh; 1399 error = gfs2_meta_inode_buffer(ip, &dibh); 1400 if (error) 1401 goto out_end_trans; 1402 ip->i_inode.i_ctime = CURRENT_TIME; 1403 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1404 gfs2_dinode_out(ip, dibh->b_data); 1405 brelse(dibh); 1406 } 1407 1408 error = gfs2_dir_del(odip, odentry); 1409 if (error) 1410 goto out_end_trans; 1411 1412 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1413 if (error) 1414 goto out_end_trans; 1415 1416 out_end_trans: 1417 gfs2_trans_end(sdp); 1418 out_ipreserv: 1419 if (alloc_required) 1420 gfs2_inplace_release(ndip); 1421 out_gunlock_q: 1422 if (alloc_required) 1423 gfs2_quota_unlock(ndip); 1424 out_alloc: 1425 if (alloc_required) 1426 gfs2_qadata_put(ndip); 1427 out_gunlock: 1428 while (x--) { 1429 gfs2_glock_dq(ghs + x); 1430 gfs2_holder_uninit(ghs + x); 1431 } 1432 out_gunlock_r: 1433 if (r_gh.gh_gl) 1434 gfs2_glock_dq_uninit(&r_gh); 1435 out: 1436 return error; 1437 } 1438 1439 /** 1440 * gfs2_follow_link - Follow a symbolic link 1441 * @dentry: The dentry of the link 1442 * @nd: Data that we pass to vfs_follow_link() 1443 * 1444 * This can handle symlinks of any size. 1445 * 1446 * Returns: 0 on success or error code 1447 */ 1448 1449 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1450 { 1451 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1452 struct gfs2_holder i_gh; 1453 struct buffer_head *dibh; 1454 unsigned int size; 1455 char *buf; 1456 int error; 1457 1458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1459 error = gfs2_glock_nq(&i_gh); 1460 if (error) { 1461 gfs2_holder_uninit(&i_gh); 1462 nd_set_link(nd, ERR_PTR(error)); 1463 return NULL; 1464 } 1465 1466 size = (unsigned int)i_size_read(&ip->i_inode); 1467 if (size == 0) { 1468 gfs2_consist_inode(ip); 1469 buf = ERR_PTR(-EIO); 1470 goto out; 1471 } 1472 1473 error = gfs2_meta_inode_buffer(ip, &dibh); 1474 if (error) { 1475 buf = ERR_PTR(error); 1476 goto out; 1477 } 1478 1479 buf = kzalloc(size + 1, GFP_NOFS); 1480 if (!buf) 1481 buf = ERR_PTR(-ENOMEM); 1482 else 1483 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1484 brelse(dibh); 1485 out: 1486 gfs2_glock_dq_uninit(&i_gh); 1487 nd_set_link(nd, buf); 1488 return NULL; 1489 } 1490 1491 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1492 { 1493 char *s = nd_get_link(nd); 1494 if (!IS_ERR(s)) 1495 kfree(s); 1496 } 1497 1498 /** 1499 * gfs2_permission - 1500 * @inode: The inode 1501 * @mask: The mask to be tested 1502 * @flags: Indicates whether this is an RCU path walk or not 1503 * 1504 * This may be called from the VFS directly, or from within GFS2 with the 1505 * inode locked, so we look to see if the glock is already locked and only 1506 * lock the glock if its not already been done. 1507 * 1508 * Returns: errno 1509 */ 1510 1511 int gfs2_permission(struct inode *inode, int mask) 1512 { 1513 struct gfs2_inode *ip; 1514 struct gfs2_holder i_gh; 1515 int error; 1516 int unlock = 0; 1517 1518 1519 ip = GFS2_I(inode); 1520 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1521 if (mask & MAY_NOT_BLOCK) 1522 return -ECHILD; 1523 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1524 if (error) 1525 return error; 1526 unlock = 1; 1527 } 1528 1529 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1530 error = -EACCES; 1531 else 1532 error = generic_permission(inode, mask); 1533 if (unlock) 1534 gfs2_glock_dq_uninit(&i_gh); 1535 1536 return error; 1537 } 1538 1539 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1540 { 1541 setattr_copy(inode, attr); 1542 mark_inode_dirty(inode); 1543 return 0; 1544 } 1545 1546 /** 1547 * gfs2_setattr_simple - 1548 * @ip: 1549 * @attr: 1550 * 1551 * Returns: errno 1552 */ 1553 1554 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1555 { 1556 int error; 1557 1558 if (current->journal_info) 1559 return __gfs2_setattr_simple(inode, attr); 1560 1561 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1562 if (error) 1563 return error; 1564 1565 error = __gfs2_setattr_simple(inode, attr); 1566 gfs2_trans_end(GFS2_SB(inode)); 1567 return error; 1568 } 1569 1570 static int setattr_chown(struct inode *inode, struct iattr *attr) 1571 { 1572 struct gfs2_inode *ip = GFS2_I(inode); 1573 struct gfs2_sbd *sdp = GFS2_SB(inode); 1574 u32 ouid, ogid, nuid, ngid; 1575 int error; 1576 1577 ouid = inode->i_uid; 1578 ogid = inode->i_gid; 1579 nuid = attr->ia_uid; 1580 ngid = attr->ia_gid; 1581 1582 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) 1583 ouid = nuid = NO_QUOTA_CHANGE; 1584 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) 1585 ogid = ngid = NO_QUOTA_CHANGE; 1586 1587 if (!gfs2_qadata_get(ip)) 1588 return -ENOMEM; 1589 1590 error = gfs2_quota_lock(ip, nuid, ngid); 1591 if (error) 1592 goto out_alloc; 1593 1594 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1595 error = gfs2_quota_check(ip, nuid, ngid); 1596 if (error) 1597 goto out_gunlock_q; 1598 } 1599 1600 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1601 if (error) 1602 goto out_gunlock_q; 1603 1604 error = gfs2_setattr_simple(inode, attr); 1605 if (error) 1606 goto out_end_trans; 1607 1608 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { 1609 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1610 gfs2_quota_change(ip, -blocks, ouid, ogid); 1611 gfs2_quota_change(ip, blocks, nuid, ngid); 1612 } 1613 1614 out_end_trans: 1615 gfs2_trans_end(sdp); 1616 out_gunlock_q: 1617 gfs2_quota_unlock(ip); 1618 out_alloc: 1619 gfs2_qadata_put(ip); 1620 return error; 1621 } 1622 1623 /** 1624 * gfs2_setattr - Change attributes on an inode 1625 * @dentry: The dentry which is changing 1626 * @attr: The structure describing the change 1627 * 1628 * The VFS layer wants to change one or more of an inodes attributes. Write 1629 * that change out to disk. 1630 * 1631 * Returns: errno 1632 */ 1633 1634 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1635 { 1636 struct inode *inode = dentry->d_inode; 1637 struct gfs2_inode *ip = GFS2_I(inode); 1638 struct gfs2_holder i_gh; 1639 int error; 1640 1641 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1642 if (error) 1643 return error; 1644 1645 error = -EPERM; 1646 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1647 goto out; 1648 1649 error = inode_change_ok(inode, attr); 1650 if (error) 1651 goto out; 1652 1653 if (attr->ia_valid & ATTR_SIZE) 1654 error = gfs2_setattr_size(inode, attr->ia_size); 1655 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1656 error = setattr_chown(inode, attr); 1657 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1658 error = gfs2_acl_chmod(ip, attr); 1659 else 1660 error = gfs2_setattr_simple(inode, attr); 1661 1662 out: 1663 if (!error) 1664 mark_inode_dirty(inode); 1665 gfs2_glock_dq_uninit(&i_gh); 1666 return error; 1667 } 1668 1669 /** 1670 * gfs2_getattr - Read out an inode's attributes 1671 * @mnt: The vfsmount the inode is being accessed from 1672 * @dentry: The dentry to stat 1673 * @stat: The inode's stats 1674 * 1675 * This may be called from the VFS directly, or from within GFS2 with the 1676 * inode locked, so we look to see if the glock is already locked and only 1677 * lock the glock if its not already been done. Note that its the NFS 1678 * readdirplus operation which causes this to be called (from filldir) 1679 * with the glock already held. 1680 * 1681 * Returns: errno 1682 */ 1683 1684 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1685 struct kstat *stat) 1686 { 1687 struct inode *inode = dentry->d_inode; 1688 struct gfs2_inode *ip = GFS2_I(inode); 1689 struct gfs2_holder gh; 1690 int error; 1691 int unlock = 0; 1692 1693 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1694 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1695 if (error) 1696 return error; 1697 unlock = 1; 1698 } 1699 1700 generic_fillattr(inode, stat); 1701 if (unlock) 1702 gfs2_glock_dq_uninit(&gh); 1703 1704 return 0; 1705 } 1706 1707 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1708 const void *data, size_t size, int flags) 1709 { 1710 struct inode *inode = dentry->d_inode; 1711 struct gfs2_inode *ip = GFS2_I(inode); 1712 struct gfs2_holder gh; 1713 int ret; 1714 1715 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1716 ret = gfs2_glock_nq(&gh); 1717 if (ret == 0) { 1718 ret = generic_setxattr(dentry, name, data, size, flags); 1719 gfs2_glock_dq(&gh); 1720 } 1721 gfs2_holder_uninit(&gh); 1722 return ret; 1723 } 1724 1725 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1726 void *data, size_t size) 1727 { 1728 struct inode *inode = dentry->d_inode; 1729 struct gfs2_inode *ip = GFS2_I(inode); 1730 struct gfs2_holder gh; 1731 int ret; 1732 1733 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1734 ret = gfs2_glock_nq(&gh); 1735 if (ret == 0) { 1736 ret = generic_getxattr(dentry, name, data, size); 1737 gfs2_glock_dq(&gh); 1738 } 1739 gfs2_holder_uninit(&gh); 1740 return ret; 1741 } 1742 1743 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1744 { 1745 struct inode *inode = dentry->d_inode; 1746 struct gfs2_inode *ip = GFS2_I(inode); 1747 struct gfs2_holder gh; 1748 int ret; 1749 1750 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1751 ret = gfs2_glock_nq(&gh); 1752 if (ret == 0) { 1753 ret = generic_removexattr(dentry, name); 1754 gfs2_glock_dq(&gh); 1755 } 1756 gfs2_holder_uninit(&gh); 1757 return ret; 1758 } 1759 1760 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1761 u64 start, u64 len) 1762 { 1763 struct gfs2_inode *ip = GFS2_I(inode); 1764 struct gfs2_holder gh; 1765 int ret; 1766 1767 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1768 if (ret) 1769 return ret; 1770 1771 mutex_lock(&inode->i_mutex); 1772 1773 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1774 if (ret) 1775 goto out; 1776 1777 if (gfs2_is_stuffed(ip)) { 1778 u64 phys = ip->i_no_addr << inode->i_blkbits; 1779 u64 size = i_size_read(inode); 1780 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1781 FIEMAP_EXTENT_DATA_INLINE; 1782 phys += sizeof(struct gfs2_dinode); 1783 phys += start; 1784 if (start + len > size) 1785 len = size - start; 1786 if (start < size) 1787 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1788 len, flags); 1789 if (ret == 1) 1790 ret = 0; 1791 } else { 1792 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1793 gfs2_block_map); 1794 } 1795 1796 gfs2_glock_dq_uninit(&gh); 1797 out: 1798 mutex_unlock(&inode->i_mutex); 1799 return ret; 1800 } 1801 1802 const struct inode_operations gfs2_file_iops = { 1803 .permission = gfs2_permission, 1804 .setattr = gfs2_setattr, 1805 .getattr = gfs2_getattr, 1806 .setxattr = gfs2_setxattr, 1807 .getxattr = gfs2_getxattr, 1808 .listxattr = gfs2_listxattr, 1809 .removexattr = gfs2_removexattr, 1810 .fiemap = gfs2_fiemap, 1811 .get_acl = gfs2_get_acl, 1812 }; 1813 1814 const struct inode_operations gfs2_dir_iops = { 1815 .create = gfs2_create, 1816 .lookup = gfs2_lookup, 1817 .link = gfs2_link, 1818 .unlink = gfs2_unlink, 1819 .symlink = gfs2_symlink, 1820 .mkdir = gfs2_mkdir, 1821 .rmdir = gfs2_unlink, 1822 .mknod = gfs2_mknod, 1823 .rename = gfs2_rename, 1824 .permission = gfs2_permission, 1825 .setattr = gfs2_setattr, 1826 .getattr = gfs2_getattr, 1827 .setxattr = gfs2_setxattr, 1828 .getxattr = gfs2_getxattr, 1829 .listxattr = gfs2_listxattr, 1830 .removexattr = gfs2_removexattr, 1831 .fiemap = gfs2_fiemap, 1832 .get_acl = gfs2_get_acl, 1833 }; 1834 1835 const struct inode_operations gfs2_symlink_iops = { 1836 .readlink = generic_readlink, 1837 .follow_link = gfs2_follow_link, 1838 .put_link = gfs2_put_link, 1839 .permission = gfs2_permission, 1840 .setattr = gfs2_setattr, 1841 .getattr = gfs2_getattr, 1842 .setxattr = gfs2_setxattr, 1843 .getxattr = gfs2_getxattr, 1844 .listxattr = gfs2_listxattr, 1845 .removexattr = gfs2_removexattr, 1846 .fiemap = gfs2_fiemap, 1847 .get_acl = gfs2_get_acl, 1848 }; 1849 1850