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