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_flags |= GL_NOCACHE; 193 ip->i_iopen_gh.gh_gl->gl_object = NULL; 194 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 195 fail_iopen: 196 if (io_gl) 197 gfs2_glock_put(io_gl); 198 fail_put: 199 ip->i_gl->gl_object = NULL; 200 gfs2_glock_put(ip->i_gl); 201 fail: 202 iget_failed(inode); 203 return ERR_PTR(error); 204 } 205 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 207 u64 *no_formal_ino, unsigned int blktype) 208 { 209 struct super_block *sb = sdp->sd_vfs; 210 struct gfs2_holder i_gh; 211 struct inode *inode = NULL; 212 int error; 213 214 /* Must not read in block until block type is verified */ 215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 217 if (error) 218 return ERR_PTR(error); 219 220 error = gfs2_check_blk_type(sdp, no_addr, blktype); 221 if (error) 222 goto fail; 223 224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 225 if (IS_ERR(inode)) 226 goto fail; 227 228 /* Two extra checks for NFS only */ 229 if (no_formal_ino) { 230 error = -ESTALE; 231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 232 goto fail_iput; 233 234 error = -EIO; 235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 236 goto fail_iput; 237 238 error = 0; 239 } 240 241 fail: 242 gfs2_glock_dq_uninit(&i_gh); 243 return error ? ERR_PTR(error) : inode; 244 fail_iput: 245 iput(inode); 246 goto fail; 247 } 248 249 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 251 { 252 struct qstr qstr; 253 struct inode *inode; 254 gfs2_str2qstr(&qstr, name); 255 inode = gfs2_lookupi(dip, &qstr, 1); 256 /* gfs2_lookupi has inconsistent callers: vfs 257 * related routines expect NULL for no entry found, 258 * gfs2_lookup_simple callers expect ENOENT 259 * and do not check for NULL. 260 */ 261 if (inode == NULL) 262 return ERR_PTR(-ENOENT); 263 else 264 return inode; 265 } 266 267 268 /** 269 * gfs2_lookupi - Look up a filename in a directory and return its inode 270 * @d_gh: An initialized holder for the directory glock 271 * @name: The name of the inode to look for 272 * @is_root: If 1, ignore the caller's permissions 273 * @i_gh: An uninitialized holder for the new inode glock 274 * 275 * This can be called via the VFS filldir function when NFS is doing 276 * a readdirplus and the inode which its intending to stat isn't 277 * already in cache. In this case we must not take the directory glock 278 * again, since the readdir call will have already taken that lock. 279 * 280 * Returns: errno 281 */ 282 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 284 int is_root) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct gfs2_inode *dip = GFS2_I(dir); 288 struct gfs2_holder d_gh; 289 int error = 0; 290 struct inode *inode = NULL; 291 int unlock = 0; 292 293 if (!name->len || name->len > GFS2_FNAMESIZE) 294 return ERR_PTR(-ENAMETOOLONG); 295 296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 298 dir == sb->s_root->d_inode)) { 299 igrab(dir); 300 return dir; 301 } 302 303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 305 if (error) 306 return ERR_PTR(error); 307 unlock = 1; 308 } 309 310 if (!is_root) { 311 error = gfs2_permission(dir, MAY_EXEC); 312 if (error) 313 goto out; 314 } 315 316 inode = gfs2_dir_search(dir, name); 317 if (IS_ERR(inode)) 318 error = PTR_ERR(inode); 319 out: 320 if (unlock) 321 gfs2_glock_dq_uninit(&d_gh); 322 if (error == -ENOENT) 323 return NULL; 324 return inode ? inode : ERR_PTR(error); 325 } 326 327 /** 328 * create_ok - OK to create a new on-disk inode here? 329 * @dip: Directory in which dinode is to be created 330 * @name: Name of new dinode 331 * @mode: 332 * 333 * Returns: errno 334 */ 335 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 337 umode_t mode) 338 { 339 int error; 340 341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 342 if (error) 343 return error; 344 345 /* Don't create entries in an unlinked directory */ 346 if (!dip->i_inode.i_nlink) 347 return -ENOENT; 348 349 error = gfs2_dir_check(&dip->i_inode, name, NULL); 350 switch (error) { 351 case -ENOENT: 352 error = 0; 353 break; 354 case 0: 355 return -EEXIST; 356 default: 357 return error; 358 } 359 360 if (dip->i_entries == (u32)-1) 361 return -EFBIG; 362 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 363 return -EMLINK; 364 365 return 0; 366 } 367 368 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 369 struct inode *inode) 370 { 371 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 372 (dip->i_inode.i_mode & S_ISUID) && 373 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 374 if (S_ISDIR(inode->i_mode)) 375 inode->i_mode |= S_ISUID; 376 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 377 inode->i_mode &= ~07111; 378 inode->i_uid = dip->i_inode.i_uid; 379 } else 380 inode->i_uid = current_fsuid(); 381 382 if (dip->i_inode.i_mode & S_ISGID) { 383 if (S_ISDIR(inode->i_mode)) 384 inode->i_mode |= S_ISGID; 385 inode->i_gid = dip->i_inode.i_gid; 386 } else 387 inode->i_gid = current_fsgid(); 388 } 389 390 static int alloc_dinode(struct gfs2_inode *ip, u32 flags) 391 { 392 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 393 int error; 394 int dblocks = 1; 395 396 error = gfs2_quota_lock_check(ip); 397 if (error) 398 goto out; 399 400 error = gfs2_inplace_reserve(ip, RES_DINODE, flags); 401 if (error) 402 goto out_quota; 403 404 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 405 if (error) 406 goto out_ipreserv; 407 408 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 409 ip->i_no_formal_ino = ip->i_generation; 410 ip->i_inode.i_ino = ip->i_no_addr; 411 ip->i_goal = ip->i_no_addr; 412 413 gfs2_trans_end(sdp); 414 415 out_ipreserv: 416 gfs2_inplace_release(ip); 417 out_quota: 418 gfs2_quota_unlock(ip); 419 out: 420 return error; 421 } 422 423 static void gfs2_init_dir(struct buffer_head *dibh, 424 const struct gfs2_inode *parent) 425 { 426 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 427 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 428 429 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 430 dent->de_inum = di->di_num; /* already GFS2 endian */ 431 dent->de_type = cpu_to_be16(DT_DIR); 432 433 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 434 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 435 gfs2_inum_out(parent, dent); 436 dent->de_type = cpu_to_be16(DT_DIR); 437 438 } 439 440 /** 441 * init_dinode - Fill in a new dinode structure 442 * @dip: The directory this inode is being created in 443 * @ip: The inode 444 * @symname: The symlink destination (if a symlink) 445 * @bhp: The buffer head (returned to caller) 446 * 447 */ 448 449 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 450 const char *symname) 451 { 452 struct gfs2_dinode *di; 453 struct buffer_head *dibh; 454 455 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 456 gfs2_trans_add_meta(ip->i_gl, dibh); 457 di = (struct gfs2_dinode *)dibh->b_data; 458 gfs2_dinode_out(ip, di); 459 460 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 461 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 462 di->__pad1 = 0; 463 di->__pad2 = 0; 464 di->__pad3 = 0; 465 memset(&di->__pad4, 0, sizeof(di->__pad4)); 466 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 467 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 468 469 switch(ip->i_inode.i_mode & S_IFMT) { 470 case S_IFDIR: 471 gfs2_init_dir(dibh, dip); 472 break; 473 case S_IFLNK: 474 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 475 break; 476 } 477 478 set_buffer_uptodate(dibh); 479 brelse(dibh); 480 } 481 482 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 483 struct gfs2_inode *ip, int arq) 484 { 485 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 486 int error; 487 488 if (arq) { 489 error = gfs2_quota_lock_check(dip); 490 if (error) 491 goto fail_quota_locks; 492 493 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 494 if (error) 495 goto fail_quota_locks; 496 497 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 498 dip->i_rgd->rd_length + 499 2 * RES_DINODE + 500 RES_STATFS + RES_QUOTA, 0); 501 if (error) 502 goto fail_ipreserv; 503 } else { 504 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 505 if (error) 506 goto fail_quota_locks; 507 } 508 509 error = gfs2_dir_add(&dip->i_inode, name, ip); 510 if (error) 511 goto fail_end_trans; 512 513 fail_end_trans: 514 gfs2_trans_end(sdp); 515 fail_ipreserv: 516 gfs2_inplace_release(dip); 517 fail_quota_locks: 518 gfs2_quota_unlock(dip); 519 return error; 520 } 521 522 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 523 void *fs_info) 524 { 525 const struct xattr *xattr; 526 int err = 0; 527 528 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 529 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 530 xattr->value_len, 0, 531 GFS2_EATYPE_SECURITY); 532 if (err < 0) 533 break; 534 } 535 return err; 536 } 537 538 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 539 const struct qstr *qstr) 540 { 541 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 542 &gfs2_initxattrs, NULL); 543 } 544 545 /** 546 * gfs2_create_inode - Create a new inode 547 * @dir: The parent directory 548 * @dentry: The new dentry 549 * @mode: The permissions on the new inode 550 * @dev: For device nodes, this is the device number 551 * @symname: For symlinks, this is the link destination 552 * @size: The initial size of the inode (ignored for directories) 553 * 554 * Returns: 0 on success, or error code 555 */ 556 557 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 558 umode_t mode, dev_t dev, const char *symname, 559 unsigned int size, int excl) 560 { 561 const struct qstr *name = &dentry->d_name; 562 struct gfs2_holder ghs[2]; 563 struct inode *inode = NULL; 564 struct gfs2_inode *dip = GFS2_I(dir), *ip; 565 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 566 struct gfs2_glock *io_gl; 567 int error; 568 u32 aflags = 0; 569 int arq; 570 571 if (!name->len || name->len > GFS2_FNAMESIZE) 572 return -ENAMETOOLONG; 573 574 error = gfs2_rs_alloc(dip); 575 if (error) 576 return error; 577 578 error = gfs2_rindex_update(sdp); 579 if (error) 580 return error; 581 582 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 583 if (error) 584 goto fail; 585 586 error = create_ok(dip, name, mode); 587 if ((error == -EEXIST) && S_ISREG(mode) && !excl) { 588 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 589 gfs2_glock_dq_uninit(ghs); 590 d_instantiate(dentry, inode); 591 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 592 } 593 if (error) 594 goto fail_gunlock; 595 596 arq = error = gfs2_diradd_alloc_required(dir, name); 597 if (error < 0) 598 goto fail_gunlock; 599 600 inode = new_inode(sdp->sd_vfs); 601 error = -ENOMEM; 602 if (!inode) 603 goto fail_gunlock; 604 605 ip = GFS2_I(inode); 606 error = gfs2_rs_alloc(ip); 607 if (error) 608 goto fail_free_inode; 609 610 inode->i_mode = mode; 611 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 612 inode->i_rdev = dev; 613 inode->i_size = size; 614 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 615 gfs2_set_inode_blocks(inode, 1); 616 munge_mode_uid_gid(dip, inode); 617 ip->i_goal = dip->i_goal; 618 ip->i_diskflags = 0; 619 ip->i_eattr = 0; 620 ip->i_height = 0; 621 ip->i_depth = 0; 622 ip->i_entries = 0; 623 624 switch(mode & S_IFMT) { 625 case S_IFREG: 626 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 627 gfs2_tune_get(sdp, gt_new_files_jdata)) 628 ip->i_diskflags |= GFS2_DIF_JDATA; 629 gfs2_set_aops(inode); 630 break; 631 case S_IFDIR: 632 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 633 ip->i_diskflags |= GFS2_DIF_JDATA; 634 ip->i_entries = 2; 635 break; 636 } 637 gfs2_set_inode_flags(inode); 638 639 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 640 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 641 aflags |= GFS2_AF_ORLOV; 642 643 error = alloc_dinode(ip, aflags); 644 if (error) 645 goto fail_free_inode; 646 647 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 648 if (error) 649 goto fail_free_inode; 650 651 ip->i_gl->gl_object = ip; 652 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 653 if (error) 654 goto fail_free_inode; 655 656 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 657 if (error) 658 goto fail_gunlock2; 659 660 init_dinode(dip, ip, symname); 661 gfs2_trans_end(sdp); 662 663 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 664 if (error) 665 goto fail_gunlock2; 666 667 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 668 if (error) 669 goto fail_gunlock2; 670 671 ip->i_iopen_gh.gh_gl->gl_object = ip; 672 gfs2_glock_put(io_gl); 673 gfs2_set_iop(inode); 674 insert_inode_hash(inode); 675 676 error = gfs2_acl_create(dip, inode); 677 if (error) 678 goto fail_gunlock3; 679 680 error = gfs2_security_init(dip, ip, name); 681 if (error) 682 goto fail_gunlock3; 683 684 error = link_dinode(dip, name, ip, arq); 685 if (error) 686 goto fail_gunlock3; 687 688 mark_inode_dirty(inode); 689 gfs2_glock_dq_uninit(ghs); 690 gfs2_glock_dq_uninit(ghs + 1); 691 d_instantiate(dentry, inode); 692 return 0; 693 694 fail_gunlock3: 695 gfs2_glock_dq_uninit(ghs + 1); 696 if (ip->i_gl) 697 gfs2_glock_put(ip->i_gl); 698 goto fail_gunlock; 699 700 fail_gunlock2: 701 gfs2_glock_dq_uninit(ghs + 1); 702 fail_free_inode: 703 if (ip->i_gl) 704 gfs2_glock_put(ip->i_gl); 705 gfs2_rs_delete(ip); 706 free_inode_nonrcu(inode); 707 inode = NULL; 708 fail_gunlock: 709 gfs2_glock_dq_uninit(ghs); 710 if (inode && !IS_ERR(inode)) { 711 clear_nlink(inode); 712 mark_inode_dirty(inode); 713 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 714 iput(inode); 715 } 716 fail: 717 return error; 718 } 719 720 /** 721 * gfs2_create - Create a file 722 * @dir: The directory in which to create the file 723 * @dentry: The dentry of the new file 724 * @mode: The mode of the new file 725 * 726 * Returns: errno 727 */ 728 729 static int gfs2_create(struct inode *dir, struct dentry *dentry, 730 umode_t mode, bool excl) 731 { 732 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); 733 } 734 735 /** 736 * gfs2_lookup - Look up a filename in a directory and return its inode 737 * @dir: The directory inode 738 * @dentry: The dentry of the new inode 739 * @nd: passed from Linux VFS, ignored by us 740 * 741 * Called by the VFS layer. Lock dir and call gfs2_lookupi() 742 * 743 * Returns: errno 744 */ 745 746 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 747 unsigned int flags) 748 { 749 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); 750 if (inode && !IS_ERR(inode)) { 751 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 752 struct gfs2_holder gh; 753 int error; 754 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 755 if (error) { 756 iput(inode); 757 return ERR_PTR(error); 758 } 759 gfs2_glock_dq_uninit(&gh); 760 } 761 return d_splice_alias(inode, dentry); 762 } 763 764 /** 765 * gfs2_link - Link to a file 766 * @old_dentry: The inode to link 767 * @dir: Add link to this directory 768 * @dentry: The name of the link 769 * 770 * Link the inode in "old_dentry" into the directory "dir" with the 771 * name in "dentry". 772 * 773 * Returns: errno 774 */ 775 776 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 777 struct dentry *dentry) 778 { 779 struct gfs2_inode *dip = GFS2_I(dir); 780 struct gfs2_sbd *sdp = GFS2_SB(dir); 781 struct inode *inode = old_dentry->d_inode; 782 struct gfs2_inode *ip = GFS2_I(inode); 783 struct gfs2_holder ghs[2]; 784 struct buffer_head *dibh; 785 int alloc_required; 786 int error; 787 788 if (S_ISDIR(inode->i_mode)) 789 return -EPERM; 790 791 error = gfs2_rs_alloc(dip); 792 if (error) 793 return error; 794 795 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 796 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 797 798 error = gfs2_glock_nq(ghs); /* parent */ 799 if (error) 800 goto out_parent; 801 802 error = gfs2_glock_nq(ghs + 1); /* child */ 803 if (error) 804 goto out_child; 805 806 error = -ENOENT; 807 if (inode->i_nlink == 0) 808 goto out_gunlock; 809 810 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 811 if (error) 812 goto out_gunlock; 813 814 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 815 switch (error) { 816 case -ENOENT: 817 break; 818 case 0: 819 error = -EEXIST; 820 default: 821 goto out_gunlock; 822 } 823 824 error = -EINVAL; 825 if (!dip->i_inode.i_nlink) 826 goto out_gunlock; 827 error = -EFBIG; 828 if (dip->i_entries == (u32)-1) 829 goto out_gunlock; 830 error = -EPERM; 831 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 832 goto out_gunlock; 833 error = -EINVAL; 834 if (!ip->i_inode.i_nlink) 835 goto out_gunlock; 836 error = -EMLINK; 837 if (ip->i_inode.i_nlink == (u32)-1) 838 goto out_gunlock; 839 840 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 841 if (error < 0) 842 goto out_gunlock; 843 error = 0; 844 845 if (alloc_required) { 846 error = gfs2_quota_lock_check(dip); 847 if (error) 848 goto out_gunlock; 849 850 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 851 if (error) 852 goto out_gunlock_q; 853 854 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 855 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 856 2 * RES_DINODE + RES_STATFS + 857 RES_QUOTA, 0); 858 if (error) 859 goto out_ipres; 860 } else { 861 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 862 if (error) 863 goto out_ipres; 864 } 865 866 error = gfs2_meta_inode_buffer(ip, &dibh); 867 if (error) 868 goto out_end_trans; 869 870 error = gfs2_dir_add(dir, &dentry->d_name, ip); 871 if (error) 872 goto out_brelse; 873 874 gfs2_trans_add_meta(ip->i_gl, dibh); 875 inc_nlink(&ip->i_inode); 876 ip->i_inode.i_ctime = CURRENT_TIME; 877 ihold(inode); 878 d_instantiate(dentry, inode); 879 mark_inode_dirty(inode); 880 881 out_brelse: 882 brelse(dibh); 883 out_end_trans: 884 gfs2_trans_end(sdp); 885 out_ipres: 886 if (alloc_required) 887 gfs2_inplace_release(dip); 888 out_gunlock_q: 889 if (alloc_required) 890 gfs2_quota_unlock(dip); 891 out_gunlock: 892 gfs2_glock_dq(ghs + 1); 893 out_child: 894 gfs2_glock_dq(ghs); 895 out_parent: 896 gfs2_holder_uninit(ghs); 897 gfs2_holder_uninit(ghs + 1); 898 return error; 899 } 900 901 /* 902 * gfs2_unlink_ok - check to see that a inode is still in a directory 903 * @dip: the directory 904 * @name: the name of the file 905 * @ip: the inode 906 * 907 * Assumes that the lock on (at least) @dip is held. 908 * 909 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 910 */ 911 912 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 913 const struct gfs2_inode *ip) 914 { 915 int error; 916 917 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 918 return -EPERM; 919 920 if ((dip->i_inode.i_mode & S_ISVTX) && 921 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 922 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 923 return -EPERM; 924 925 if (IS_APPEND(&dip->i_inode)) 926 return -EPERM; 927 928 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 929 if (error) 930 return error; 931 932 error = gfs2_dir_check(&dip->i_inode, name, ip); 933 if (error) 934 return error; 935 936 return 0; 937 } 938 939 /** 940 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 941 * @dip: The parent directory 942 * @name: The name of the entry in the parent directory 943 * @inode: The inode to be removed 944 * 945 * Called with all the locks and in a transaction. This will only be 946 * called for a directory after it has been checked to ensure it is empty. 947 * 948 * Returns: 0 on success, or an error 949 */ 950 951 static int gfs2_unlink_inode(struct gfs2_inode *dip, 952 const struct dentry *dentry) 953 { 954 struct inode *inode = dentry->d_inode; 955 struct gfs2_inode *ip = GFS2_I(inode); 956 int error; 957 958 error = gfs2_dir_del(dip, dentry); 959 if (error) 960 return error; 961 962 ip->i_entries = 0; 963 inode->i_ctime = CURRENT_TIME; 964 if (S_ISDIR(inode->i_mode)) 965 clear_nlink(inode); 966 else 967 drop_nlink(inode); 968 mark_inode_dirty(inode); 969 if (inode->i_nlink == 0) 970 gfs2_unlink_di(inode); 971 return 0; 972 } 973 974 975 /** 976 * gfs2_unlink - Unlink an inode (this does rmdir as well) 977 * @dir: The inode of the directory containing the inode to unlink 978 * @dentry: The file itself 979 * 980 * This routine uses the type of the inode as a flag to figure out 981 * whether this is an unlink or an rmdir. 982 * 983 * Returns: errno 984 */ 985 986 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 987 { 988 struct gfs2_inode *dip = GFS2_I(dir); 989 struct gfs2_sbd *sdp = GFS2_SB(dir); 990 struct inode *inode = dentry->d_inode; 991 struct gfs2_inode *ip = GFS2_I(inode); 992 struct gfs2_holder ghs[3]; 993 struct gfs2_rgrpd *rgd; 994 int error; 995 996 error = gfs2_rindex_update(sdp); 997 if (error) 998 return error; 999 1000 error = -EROFS; 1001 1002 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1003 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1004 1005 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1006 if (!rgd) 1007 goto out_inodes; 1008 1009 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1010 1011 1012 error = gfs2_glock_nq(ghs); /* parent */ 1013 if (error) 1014 goto out_parent; 1015 1016 error = gfs2_glock_nq(ghs + 1); /* child */ 1017 if (error) 1018 goto out_child; 1019 1020 error = -ENOENT; 1021 if (inode->i_nlink == 0) 1022 goto out_rgrp; 1023 1024 if (S_ISDIR(inode->i_mode)) { 1025 error = -ENOTEMPTY; 1026 if (ip->i_entries > 2 || inode->i_nlink > 2) 1027 goto out_rgrp; 1028 } 1029 1030 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1031 if (error) 1032 goto out_rgrp; 1033 1034 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1035 if (error) 1036 goto out_gunlock; 1037 1038 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1039 if (error) 1040 goto out_end_trans; 1041 1042 error = gfs2_unlink_inode(dip, dentry); 1043 1044 out_end_trans: 1045 gfs2_trans_end(sdp); 1046 out_gunlock: 1047 gfs2_glock_dq(ghs + 2); 1048 out_rgrp: 1049 gfs2_glock_dq(ghs + 1); 1050 out_child: 1051 gfs2_glock_dq(ghs); 1052 out_parent: 1053 gfs2_holder_uninit(ghs + 2); 1054 out_inodes: 1055 gfs2_holder_uninit(ghs + 1); 1056 gfs2_holder_uninit(ghs); 1057 return error; 1058 } 1059 1060 /** 1061 * gfs2_symlink - Create a symlink 1062 * @dir: The directory to create the symlink in 1063 * @dentry: The dentry to put the symlink in 1064 * @symname: The thing which the link points to 1065 * 1066 * Returns: errno 1067 */ 1068 1069 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1070 const char *symname) 1071 { 1072 struct gfs2_sbd *sdp = GFS2_SB(dir); 1073 unsigned int size; 1074 1075 size = strlen(symname); 1076 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1077 return -ENAMETOOLONG; 1078 1079 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1080 } 1081 1082 /** 1083 * gfs2_mkdir - Make a directory 1084 * @dir: The parent directory of the new one 1085 * @dentry: The dentry of the new directory 1086 * @mode: The mode of the new directory 1087 * 1088 * Returns: errno 1089 */ 1090 1091 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1092 { 1093 struct gfs2_sbd *sdp = GFS2_SB(dir); 1094 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1095 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, dsize, 0); 1096 } 1097 1098 /** 1099 * gfs2_mknod - Make a special file 1100 * @dir: The directory in which the special file will reside 1101 * @dentry: The dentry of the special file 1102 * @mode: The mode of the special file 1103 * @dev: The device specification of the special file 1104 * 1105 */ 1106 1107 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1108 dev_t dev) 1109 { 1110 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); 1111 } 1112 1113 /* 1114 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1115 * @this: move this 1116 * @to: to here 1117 * 1118 * Follow @to back to the root and make sure we don't encounter @this 1119 * Assumes we already hold the rename lock. 1120 * 1121 * Returns: errno 1122 */ 1123 1124 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1125 { 1126 struct inode *dir = &to->i_inode; 1127 struct super_block *sb = dir->i_sb; 1128 struct inode *tmp; 1129 int error = 0; 1130 1131 igrab(dir); 1132 1133 for (;;) { 1134 if (dir == &this->i_inode) { 1135 error = -EINVAL; 1136 break; 1137 } 1138 if (dir == sb->s_root->d_inode) { 1139 error = 0; 1140 break; 1141 } 1142 1143 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1144 if (IS_ERR(tmp)) { 1145 error = PTR_ERR(tmp); 1146 break; 1147 } 1148 1149 iput(dir); 1150 dir = tmp; 1151 } 1152 1153 iput(dir); 1154 1155 return error; 1156 } 1157 1158 /** 1159 * gfs2_rename - Rename a file 1160 * @odir: Parent directory of old file name 1161 * @odentry: The old dentry of the file 1162 * @ndir: Parent directory of new file name 1163 * @ndentry: The new dentry of the file 1164 * 1165 * Returns: errno 1166 */ 1167 1168 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1169 struct inode *ndir, struct dentry *ndentry) 1170 { 1171 struct gfs2_inode *odip = GFS2_I(odir); 1172 struct gfs2_inode *ndip = GFS2_I(ndir); 1173 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1174 struct gfs2_inode *nip = NULL; 1175 struct gfs2_sbd *sdp = GFS2_SB(odir); 1176 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1177 struct gfs2_rgrpd *nrgd; 1178 unsigned int num_gh; 1179 int dir_rename = 0; 1180 int alloc_required = 0; 1181 unsigned int x; 1182 int error; 1183 1184 if (ndentry->d_inode) { 1185 nip = GFS2_I(ndentry->d_inode); 1186 if (ip == nip) 1187 return 0; 1188 } 1189 1190 error = gfs2_rindex_update(sdp); 1191 if (error) 1192 return error; 1193 1194 error = gfs2_rs_alloc(ndip); 1195 if (error) 1196 return error; 1197 1198 if (odip != ndip) { 1199 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1200 0, &r_gh); 1201 if (error) 1202 goto out; 1203 1204 if (S_ISDIR(ip->i_inode.i_mode)) { 1205 dir_rename = 1; 1206 /* don't move a dirctory into it's subdir */ 1207 error = gfs2_ok_to_move(ip, ndip); 1208 if (error) 1209 goto out_gunlock_r; 1210 } 1211 } 1212 1213 num_gh = 1; 1214 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1215 if (odip != ndip) { 1216 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1217 num_gh++; 1218 } 1219 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1220 num_gh++; 1221 1222 if (nip) { 1223 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1224 num_gh++; 1225 /* grab the resource lock for unlink flag twiddling 1226 * this is the case of the target file already existing 1227 * so we unlink before doing the rename 1228 */ 1229 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1230 if (nrgd) 1231 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1232 } 1233 1234 for (x = 0; x < num_gh; x++) { 1235 error = gfs2_glock_nq(ghs + x); 1236 if (error) 1237 goto out_gunlock; 1238 } 1239 1240 error = -ENOENT; 1241 if (ip->i_inode.i_nlink == 0) 1242 goto out_gunlock; 1243 1244 /* Check out the old directory */ 1245 1246 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1247 if (error) 1248 goto out_gunlock; 1249 1250 /* Check out the new directory */ 1251 1252 if (nip) { 1253 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1254 if (error) 1255 goto out_gunlock; 1256 1257 if (nip->i_inode.i_nlink == 0) { 1258 error = -EAGAIN; 1259 goto out_gunlock; 1260 } 1261 1262 if (S_ISDIR(nip->i_inode.i_mode)) { 1263 if (nip->i_entries < 2) { 1264 gfs2_consist_inode(nip); 1265 error = -EIO; 1266 goto out_gunlock; 1267 } 1268 if (nip->i_entries > 2) { 1269 error = -ENOTEMPTY; 1270 goto out_gunlock; 1271 } 1272 } 1273 } else { 1274 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1275 if (error) 1276 goto out_gunlock; 1277 1278 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1279 switch (error) { 1280 case -ENOENT: 1281 error = 0; 1282 break; 1283 case 0: 1284 error = -EEXIST; 1285 default: 1286 goto out_gunlock; 1287 }; 1288 1289 if (odip != ndip) { 1290 if (!ndip->i_inode.i_nlink) { 1291 error = -ENOENT; 1292 goto out_gunlock; 1293 } 1294 if (ndip->i_entries == (u32)-1) { 1295 error = -EFBIG; 1296 goto out_gunlock; 1297 } 1298 if (S_ISDIR(ip->i_inode.i_mode) && 1299 ndip->i_inode.i_nlink == (u32)-1) { 1300 error = -EMLINK; 1301 goto out_gunlock; 1302 } 1303 } 1304 } 1305 1306 /* Check out the dir to be renamed */ 1307 1308 if (dir_rename) { 1309 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1310 if (error) 1311 goto out_gunlock; 1312 } 1313 1314 if (nip == NULL) 1315 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1316 error = alloc_required; 1317 if (error < 0) 1318 goto out_gunlock; 1319 1320 if (alloc_required) { 1321 error = gfs2_quota_lock_check(ndip); 1322 if (error) 1323 goto out_gunlock; 1324 1325 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); 1326 if (error) 1327 goto out_gunlock_q; 1328 1329 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1330 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1331 4 * RES_DINODE + 4 * RES_LEAF + 1332 RES_STATFS + RES_QUOTA + 4, 0); 1333 if (error) 1334 goto out_ipreserv; 1335 } else { 1336 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1337 5 * RES_LEAF + 4, 0); 1338 if (error) 1339 goto out_gunlock; 1340 } 1341 1342 /* Remove the target file, if it exists */ 1343 1344 if (nip) 1345 error = gfs2_unlink_inode(ndip, ndentry); 1346 1347 if (dir_rename) { 1348 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1349 if (error) 1350 goto out_end_trans; 1351 } else { 1352 struct buffer_head *dibh; 1353 error = gfs2_meta_inode_buffer(ip, &dibh); 1354 if (error) 1355 goto out_end_trans; 1356 ip->i_inode.i_ctime = CURRENT_TIME; 1357 gfs2_trans_add_meta(ip->i_gl, dibh); 1358 gfs2_dinode_out(ip, dibh->b_data); 1359 brelse(dibh); 1360 } 1361 1362 error = gfs2_dir_del(odip, odentry); 1363 if (error) 1364 goto out_end_trans; 1365 1366 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1367 if (error) 1368 goto out_end_trans; 1369 1370 out_end_trans: 1371 gfs2_trans_end(sdp); 1372 out_ipreserv: 1373 if (alloc_required) 1374 gfs2_inplace_release(ndip); 1375 out_gunlock_q: 1376 if (alloc_required) 1377 gfs2_quota_unlock(ndip); 1378 out_gunlock: 1379 while (x--) { 1380 gfs2_glock_dq(ghs + x); 1381 gfs2_holder_uninit(ghs + x); 1382 } 1383 out_gunlock_r: 1384 if (r_gh.gh_gl) 1385 gfs2_glock_dq_uninit(&r_gh); 1386 out: 1387 return error; 1388 } 1389 1390 /** 1391 * gfs2_follow_link - Follow a symbolic link 1392 * @dentry: The dentry of the link 1393 * @nd: Data that we pass to vfs_follow_link() 1394 * 1395 * This can handle symlinks of any size. 1396 * 1397 * Returns: 0 on success or error code 1398 */ 1399 1400 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1401 { 1402 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1403 struct gfs2_holder i_gh; 1404 struct buffer_head *dibh; 1405 unsigned int size; 1406 char *buf; 1407 int error; 1408 1409 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1410 error = gfs2_glock_nq(&i_gh); 1411 if (error) { 1412 gfs2_holder_uninit(&i_gh); 1413 nd_set_link(nd, ERR_PTR(error)); 1414 return NULL; 1415 } 1416 1417 size = (unsigned int)i_size_read(&ip->i_inode); 1418 if (size == 0) { 1419 gfs2_consist_inode(ip); 1420 buf = ERR_PTR(-EIO); 1421 goto out; 1422 } 1423 1424 error = gfs2_meta_inode_buffer(ip, &dibh); 1425 if (error) { 1426 buf = ERR_PTR(error); 1427 goto out; 1428 } 1429 1430 buf = kzalloc(size + 1, GFP_NOFS); 1431 if (!buf) 1432 buf = ERR_PTR(-ENOMEM); 1433 else 1434 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1435 brelse(dibh); 1436 out: 1437 gfs2_glock_dq_uninit(&i_gh); 1438 nd_set_link(nd, buf); 1439 return NULL; 1440 } 1441 1442 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1443 { 1444 char *s = nd_get_link(nd); 1445 if (!IS_ERR(s)) 1446 kfree(s); 1447 } 1448 1449 /** 1450 * gfs2_permission - 1451 * @inode: The inode 1452 * @mask: The mask to be tested 1453 * @flags: Indicates whether this is an RCU path walk or not 1454 * 1455 * This may be called from the VFS directly, or from within GFS2 with the 1456 * inode locked, so we look to see if the glock is already locked and only 1457 * lock the glock if its not already been done. 1458 * 1459 * Returns: errno 1460 */ 1461 1462 int gfs2_permission(struct inode *inode, int mask) 1463 { 1464 struct gfs2_inode *ip; 1465 struct gfs2_holder i_gh; 1466 int error; 1467 int unlock = 0; 1468 1469 1470 ip = GFS2_I(inode); 1471 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1472 if (mask & MAY_NOT_BLOCK) 1473 return -ECHILD; 1474 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1475 if (error) 1476 return error; 1477 unlock = 1; 1478 } 1479 1480 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1481 error = -EACCES; 1482 else 1483 error = generic_permission(inode, mask); 1484 if (unlock) 1485 gfs2_glock_dq_uninit(&i_gh); 1486 1487 return error; 1488 } 1489 1490 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1491 { 1492 setattr_copy(inode, attr); 1493 mark_inode_dirty(inode); 1494 return 0; 1495 } 1496 1497 /** 1498 * gfs2_setattr_simple - 1499 * @ip: 1500 * @attr: 1501 * 1502 * Returns: errno 1503 */ 1504 1505 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1506 { 1507 int error; 1508 1509 if (current->journal_info) 1510 return __gfs2_setattr_simple(inode, attr); 1511 1512 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1513 if (error) 1514 return error; 1515 1516 error = __gfs2_setattr_simple(inode, attr); 1517 gfs2_trans_end(GFS2_SB(inode)); 1518 return error; 1519 } 1520 1521 static int setattr_chown(struct inode *inode, struct iattr *attr) 1522 { 1523 struct gfs2_inode *ip = GFS2_I(inode); 1524 struct gfs2_sbd *sdp = GFS2_SB(inode); 1525 kuid_t ouid, nuid; 1526 kgid_t ogid, ngid; 1527 int error; 1528 1529 ouid = inode->i_uid; 1530 ogid = inode->i_gid; 1531 nuid = attr->ia_uid; 1532 ngid = attr->ia_gid; 1533 1534 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1535 ouid = nuid = NO_UID_QUOTA_CHANGE; 1536 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1537 ogid = ngid = NO_GID_QUOTA_CHANGE; 1538 1539 error = gfs2_quota_lock(ip, nuid, ngid); 1540 if (error) 1541 return error; 1542 1543 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1544 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1545 error = gfs2_quota_check(ip, nuid, ngid); 1546 if (error) 1547 goto out_gunlock_q; 1548 } 1549 1550 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1551 if (error) 1552 goto out_gunlock_q; 1553 1554 error = gfs2_setattr_simple(inode, attr); 1555 if (error) 1556 goto out_end_trans; 1557 1558 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1559 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1560 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1561 gfs2_quota_change(ip, -blocks, ouid, ogid); 1562 gfs2_quota_change(ip, blocks, nuid, ngid); 1563 } 1564 1565 out_end_trans: 1566 gfs2_trans_end(sdp); 1567 out_gunlock_q: 1568 gfs2_quota_unlock(ip); 1569 return error; 1570 } 1571 1572 /** 1573 * gfs2_setattr - Change attributes on an inode 1574 * @dentry: The dentry which is changing 1575 * @attr: The structure describing the change 1576 * 1577 * The VFS layer wants to change one or more of an inodes attributes. Write 1578 * that change out to disk. 1579 * 1580 * Returns: errno 1581 */ 1582 1583 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1584 { 1585 struct inode *inode = dentry->d_inode; 1586 struct gfs2_inode *ip = GFS2_I(inode); 1587 struct gfs2_holder i_gh; 1588 int error; 1589 1590 error = gfs2_rs_alloc(ip); 1591 if (error) 1592 return error; 1593 1594 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1595 if (error) 1596 return error; 1597 1598 error = -EPERM; 1599 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1600 goto out; 1601 1602 error = inode_change_ok(inode, attr); 1603 if (error) 1604 goto out; 1605 1606 if (attr->ia_valid & ATTR_SIZE) 1607 error = gfs2_setattr_size(inode, attr->ia_size); 1608 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1609 error = setattr_chown(inode, attr); 1610 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1611 error = gfs2_acl_chmod(ip, attr); 1612 else 1613 error = gfs2_setattr_simple(inode, attr); 1614 1615 out: 1616 if (!error) 1617 mark_inode_dirty(inode); 1618 gfs2_glock_dq_uninit(&i_gh); 1619 return error; 1620 } 1621 1622 /** 1623 * gfs2_getattr - Read out an inode's attributes 1624 * @mnt: The vfsmount the inode is being accessed from 1625 * @dentry: The dentry to stat 1626 * @stat: The inode's stats 1627 * 1628 * This may be called from the VFS directly, or from within GFS2 with the 1629 * inode locked, so we look to see if the glock is already locked and only 1630 * lock the glock if its not already been done. Note that its the NFS 1631 * readdirplus operation which causes this to be called (from filldir) 1632 * with the glock already held. 1633 * 1634 * Returns: errno 1635 */ 1636 1637 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1638 struct kstat *stat) 1639 { 1640 struct inode *inode = dentry->d_inode; 1641 struct gfs2_inode *ip = GFS2_I(inode); 1642 struct gfs2_holder gh; 1643 int error; 1644 int unlock = 0; 1645 1646 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1647 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1648 if (error) 1649 return error; 1650 unlock = 1; 1651 } 1652 1653 generic_fillattr(inode, stat); 1654 if (unlock) 1655 gfs2_glock_dq_uninit(&gh); 1656 1657 return 0; 1658 } 1659 1660 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1661 const void *data, size_t size, int flags) 1662 { 1663 struct inode *inode = dentry->d_inode; 1664 struct gfs2_inode *ip = GFS2_I(inode); 1665 struct gfs2_holder gh; 1666 int ret; 1667 1668 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1669 ret = gfs2_glock_nq(&gh); 1670 if (ret == 0) { 1671 ret = gfs2_rs_alloc(ip); 1672 if (ret == 0) 1673 ret = generic_setxattr(dentry, name, data, size, flags); 1674 gfs2_glock_dq(&gh); 1675 } 1676 gfs2_holder_uninit(&gh); 1677 return ret; 1678 } 1679 1680 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1681 void *data, size_t size) 1682 { 1683 struct inode *inode = dentry->d_inode; 1684 struct gfs2_inode *ip = GFS2_I(inode); 1685 struct gfs2_holder gh; 1686 int ret; 1687 1688 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1689 ret = gfs2_glock_nq(&gh); 1690 if (ret == 0) { 1691 ret = generic_getxattr(dentry, name, data, size); 1692 gfs2_glock_dq(&gh); 1693 } 1694 gfs2_holder_uninit(&gh); 1695 return ret; 1696 } 1697 1698 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1699 { 1700 struct inode *inode = dentry->d_inode; 1701 struct gfs2_inode *ip = GFS2_I(inode); 1702 struct gfs2_holder gh; 1703 int ret; 1704 1705 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1706 ret = gfs2_glock_nq(&gh); 1707 if (ret == 0) { 1708 ret = gfs2_rs_alloc(ip); 1709 if (ret == 0) 1710 ret = generic_removexattr(dentry, name); 1711 gfs2_glock_dq(&gh); 1712 } 1713 gfs2_holder_uninit(&gh); 1714 return ret; 1715 } 1716 1717 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1718 u64 start, u64 len) 1719 { 1720 struct gfs2_inode *ip = GFS2_I(inode); 1721 struct gfs2_holder gh; 1722 int ret; 1723 1724 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1725 if (ret) 1726 return ret; 1727 1728 mutex_lock(&inode->i_mutex); 1729 1730 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1731 if (ret) 1732 goto out; 1733 1734 if (gfs2_is_stuffed(ip)) { 1735 u64 phys = ip->i_no_addr << inode->i_blkbits; 1736 u64 size = i_size_read(inode); 1737 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1738 FIEMAP_EXTENT_DATA_INLINE; 1739 phys += sizeof(struct gfs2_dinode); 1740 phys += start; 1741 if (start + len > size) 1742 len = size - start; 1743 if (start < size) 1744 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1745 len, flags); 1746 if (ret == 1) 1747 ret = 0; 1748 } else { 1749 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1750 gfs2_block_map); 1751 } 1752 1753 gfs2_glock_dq_uninit(&gh); 1754 out: 1755 mutex_unlock(&inode->i_mutex); 1756 return ret; 1757 } 1758 1759 const struct inode_operations gfs2_file_iops = { 1760 .permission = gfs2_permission, 1761 .setattr = gfs2_setattr, 1762 .getattr = gfs2_getattr, 1763 .setxattr = gfs2_setxattr, 1764 .getxattr = gfs2_getxattr, 1765 .listxattr = gfs2_listxattr, 1766 .removexattr = gfs2_removexattr, 1767 .fiemap = gfs2_fiemap, 1768 .get_acl = gfs2_get_acl, 1769 }; 1770 1771 const struct inode_operations gfs2_dir_iops = { 1772 .create = gfs2_create, 1773 .lookup = gfs2_lookup, 1774 .link = gfs2_link, 1775 .unlink = gfs2_unlink, 1776 .symlink = gfs2_symlink, 1777 .mkdir = gfs2_mkdir, 1778 .rmdir = gfs2_unlink, 1779 .mknod = gfs2_mknod, 1780 .rename = gfs2_rename, 1781 .permission = gfs2_permission, 1782 .setattr = gfs2_setattr, 1783 .getattr = gfs2_getattr, 1784 .setxattr = gfs2_setxattr, 1785 .getxattr = gfs2_getxattr, 1786 .listxattr = gfs2_listxattr, 1787 .removexattr = gfs2_removexattr, 1788 .fiemap = gfs2_fiemap, 1789 .get_acl = gfs2_get_acl, 1790 }; 1791 1792 const struct inode_operations gfs2_symlink_iops = { 1793 .readlink = generic_readlink, 1794 .follow_link = gfs2_follow_link, 1795 .put_link = gfs2_put_link, 1796 .permission = gfs2_permission, 1797 .setattr = gfs2_setattr, 1798 .getattr = gfs2_getattr, 1799 .setxattr = gfs2_setxattr, 1800 .getxattr = gfs2_getxattr, 1801 .listxattr = gfs2_listxattr, 1802 .removexattr = gfs2_removexattr, 1803 .fiemap = gfs2_fiemap, 1804 .get_acl = gfs2_get_acl, 1805 }; 1806 1807