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(-ENOMEM); 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, false); 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 if (dip->i_entries == (u32)-1) 350 return -EFBIG; 351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 352 return -EMLINK; 353 354 return 0; 355 } 356 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 358 struct inode *inode) 359 { 360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 361 (dip->i_inode.i_mode & S_ISUID) && 362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 363 if (S_ISDIR(inode->i_mode)) 364 inode->i_mode |= S_ISUID; 365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 366 inode->i_mode &= ~07111; 367 inode->i_uid = dip->i_inode.i_uid; 368 } else 369 inode->i_uid = current_fsuid(); 370 371 if (dip->i_inode.i_mode & S_ISGID) { 372 if (S_ISDIR(inode->i_mode)) 373 inode->i_mode |= S_ISGID; 374 inode->i_gid = dip->i_inode.i_gid; 375 } else 376 inode->i_gid = current_fsgid(); 377 } 378 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 383 int error; 384 385 error = gfs2_quota_lock_check(ip); 386 if (error) 387 goto out; 388 389 error = gfs2_inplace_reserve(ip, &ap); 390 if (error) 391 goto out_quota; 392 393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 394 if (error) 395 goto out_ipreserv; 396 397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 398 ip->i_no_formal_ino = ip->i_generation; 399 ip->i_inode.i_ino = ip->i_no_addr; 400 ip->i_goal = ip->i_no_addr; 401 402 gfs2_trans_end(sdp); 403 404 out_ipreserv: 405 gfs2_inplace_release(ip); 406 out_quota: 407 gfs2_quota_unlock(ip); 408 out: 409 return error; 410 } 411 412 static void gfs2_init_dir(struct buffer_head *dibh, 413 const struct gfs2_inode *parent) 414 { 415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 417 418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 419 dent->de_inum = di->di_num; /* already GFS2 endian */ 420 dent->de_type = cpu_to_be16(DT_DIR); 421 422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 424 gfs2_inum_out(parent, dent); 425 dent->de_type = cpu_to_be16(DT_DIR); 426 427 } 428 429 /** 430 * gfs2_init_xattr - Initialise an xattr block for a new inode 431 * @ip: The inode in question 432 * 433 * This sets up an empty xattr block for a new inode, ready to 434 * take any ACLs, LSM xattrs, etc. 435 */ 436 437 static void gfs2_init_xattr(struct gfs2_inode *ip) 438 { 439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 440 struct buffer_head *bh; 441 struct gfs2_ea_header *ea; 442 443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 444 gfs2_trans_add_meta(ip->i_gl, bh); 445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 447 448 ea = GFS2_EA_BH2FIRST(bh); 449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 450 ea->ea_type = GFS2_EATYPE_UNUSED; 451 ea->ea_flags = GFS2_EAFLAG_LAST; 452 453 brelse(bh); 454 } 455 456 /** 457 * init_dinode - Fill in a new dinode structure 458 * @dip: The directory this inode is being created in 459 * @ip: The inode 460 * @symname: The symlink destination (if a symlink) 461 * @bhp: The buffer head (returned to caller) 462 * 463 */ 464 465 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 466 const char *symname) 467 { 468 struct gfs2_dinode *di; 469 struct buffer_head *dibh; 470 471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 472 gfs2_trans_add_meta(ip->i_gl, dibh); 473 di = (struct gfs2_dinode *)dibh->b_data; 474 gfs2_dinode_out(ip, di); 475 476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 478 di->__pad1 = 0; 479 di->__pad2 = 0; 480 di->__pad3 = 0; 481 memset(&di->__pad4, 0, sizeof(di->__pad4)); 482 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 484 485 switch(ip->i_inode.i_mode & S_IFMT) { 486 case S_IFDIR: 487 gfs2_init_dir(dibh, dip); 488 break; 489 case S_IFLNK: 490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 491 break; 492 } 493 494 set_buffer_uptodate(dibh); 495 brelse(dibh); 496 } 497 498 /** 499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 500 * @dip: The directory we are linking into 501 * @da: The dir add information 502 * @nr_inodes: The number of inodes involved 503 * 504 * This calculate the number of blocks we need to reserve in a 505 * transaction to link @nr_inodes into a directory. In most cases 506 * @nr_inodes will be 2 (the directory plus the inode being linked in) 507 * but in case of rename, 4 may be required. 508 * 509 * Returns: Number of blocks 510 */ 511 512 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 513 const struct gfs2_diradd *da, 514 unsigned nr_inodes) 515 { 516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 518 } 519 520 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 521 struct gfs2_inode *ip, struct gfs2_diradd *da) 522 { 523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 525 int error; 526 527 if (da->nr_blocks) { 528 error = gfs2_quota_lock_check(dip); 529 if (error) 530 goto fail_quota_locks; 531 532 error = gfs2_inplace_reserve(dip, &ap); 533 if (error) 534 goto fail_quota_locks; 535 536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 537 if (error) 538 goto fail_ipreserv; 539 } else { 540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 541 if (error) 542 goto fail_quota_locks; 543 } 544 545 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 546 if (error) 547 goto fail_end_trans; 548 549 fail_end_trans: 550 gfs2_trans_end(sdp); 551 fail_ipreserv: 552 gfs2_inplace_release(dip); 553 fail_quota_locks: 554 gfs2_quota_unlock(dip); 555 return error; 556 } 557 558 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 559 void *fs_info) 560 { 561 const struct xattr *xattr; 562 int err = 0; 563 564 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 566 xattr->value_len, 0, 567 GFS2_EATYPE_SECURITY); 568 if (err < 0) 569 break; 570 } 571 return err; 572 } 573 574 /** 575 * gfs2_create_inode - Create a new inode 576 * @dir: The parent directory 577 * @dentry: The new dentry 578 * @file: If non-NULL, the file which is being opened 579 * @mode: The permissions on the new inode 580 * @dev: For device nodes, this is the device number 581 * @symname: For symlinks, this is the link destination 582 * @size: The initial size of the inode (ignored for directories) 583 * 584 * Returns: 0 on success, or error code 585 */ 586 587 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 588 struct file *file, 589 umode_t mode, dev_t dev, const char *symname, 590 unsigned int size, int excl, int *opened) 591 { 592 const struct qstr *name = &dentry->d_name; 593 struct posix_acl *default_acl, *acl; 594 struct gfs2_holder ghs[2]; 595 struct inode *inode = NULL; 596 struct gfs2_inode *dip = GFS2_I(dir), *ip; 597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 598 struct gfs2_glock *io_gl; 599 struct dentry *d; 600 int error, free_vfs_inode = 0; 601 u32 aflags = 0; 602 unsigned blocks = 1; 603 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 604 605 if (!name->len || name->len > GFS2_FNAMESIZE) 606 return -ENAMETOOLONG; 607 608 error = gfs2_rs_alloc(dip); 609 if (error) 610 return error; 611 612 error = gfs2_rindex_update(sdp); 613 if (error) 614 return error; 615 616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 617 if (error) 618 goto fail; 619 620 error = create_ok(dip, name, mode); 621 if (error) 622 goto fail_gunlock; 623 624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 625 error = PTR_ERR(inode); 626 if (!IS_ERR(inode)) { 627 d = d_splice_alias(inode, dentry); 628 error = PTR_ERR(d); 629 if (IS_ERR(d)) { 630 inode = ERR_CAST(d); 631 goto fail_gunlock; 632 } 633 error = 0; 634 if (file) { 635 if (S_ISREG(inode->i_mode)) { 636 WARN_ON(d != NULL); 637 error = finish_open(file, dentry, gfs2_open_common, opened); 638 } else { 639 error = finish_no_open(file, d); 640 } 641 } else { 642 dput(d); 643 } 644 gfs2_glock_dq_uninit(ghs); 645 return error; 646 } else if (error != -ENOENT) { 647 goto fail_gunlock; 648 } 649 650 error = gfs2_diradd_alloc_required(dir, name, &da); 651 if (error < 0) 652 goto fail_gunlock; 653 654 inode = new_inode(sdp->sd_vfs); 655 error = -ENOMEM; 656 if (!inode) 657 goto fail_gunlock; 658 659 error = posix_acl_create(dir, &mode, &default_acl, &acl); 660 if (error) 661 goto fail_free_vfs_inode; 662 663 ip = GFS2_I(inode); 664 error = gfs2_rs_alloc(ip); 665 if (error) 666 goto fail_free_acls; 667 668 inode->i_mode = mode; 669 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 670 inode->i_rdev = dev; 671 inode->i_size = size; 672 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 673 gfs2_set_inode_blocks(inode, 1); 674 munge_mode_uid_gid(dip, inode); 675 check_and_update_goal(dip); 676 ip->i_goal = dip->i_goal; 677 ip->i_diskflags = 0; 678 ip->i_eattr = 0; 679 ip->i_height = 0; 680 ip->i_depth = 0; 681 ip->i_entries = 0; 682 683 switch(mode & S_IFMT) { 684 case S_IFREG: 685 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 686 gfs2_tune_get(sdp, gt_new_files_jdata)) 687 ip->i_diskflags |= GFS2_DIF_JDATA; 688 gfs2_set_aops(inode); 689 break; 690 case S_IFDIR: 691 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 692 ip->i_diskflags |= GFS2_DIF_JDATA; 693 ip->i_entries = 2; 694 break; 695 } 696 gfs2_set_inode_flags(inode); 697 698 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 699 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 700 aflags |= GFS2_AF_ORLOV; 701 702 if (default_acl || acl) 703 blocks++; 704 705 error = alloc_dinode(ip, aflags, &blocks); 706 if (error) 707 goto fail_free_inode; 708 709 gfs2_set_inode_blocks(inode, blocks); 710 711 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 712 if (error) 713 goto fail_free_inode; 714 715 ip->i_gl->gl_object = ip; 716 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 717 if (error) 718 goto fail_free_inode; 719 720 error = gfs2_trans_begin(sdp, blocks, 0); 721 if (error) 722 goto fail_gunlock2; 723 724 if (blocks > 1) { 725 ip->i_eattr = ip->i_no_addr + 1; 726 gfs2_init_xattr(ip); 727 } 728 init_dinode(dip, ip, symname); 729 gfs2_trans_end(sdp); 730 731 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 732 if (error) 733 goto fail_gunlock2; 734 735 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 736 if (error) 737 goto fail_gunlock2; 738 739 ip->i_iopen_gh.gh_gl->gl_object = ip; 740 gfs2_glock_put(io_gl); 741 gfs2_set_iop(inode); 742 insert_inode_hash(inode); 743 744 if (default_acl) { 745 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 746 posix_acl_release(default_acl); 747 } 748 if (acl) { 749 if (!error) 750 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 751 posix_acl_release(acl); 752 } 753 754 if (error) 755 goto fail_gunlock3; 756 757 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 758 &gfs2_initxattrs, NULL); 759 if (error) 760 goto fail_gunlock3; 761 762 error = link_dinode(dip, name, ip, &da); 763 if (error) 764 goto fail_gunlock3; 765 766 mark_inode_dirty(inode); 767 d_instantiate(dentry, inode); 768 if (file) { 769 *opened |= FILE_CREATED; 770 error = finish_open(file, dentry, gfs2_open_common, opened); 771 } 772 gfs2_glock_dq_uninit(ghs); 773 gfs2_glock_dq_uninit(ghs + 1); 774 return error; 775 776 fail_gunlock3: 777 gfs2_glock_dq_uninit(ghs + 1); 778 if (ip->i_gl) 779 gfs2_glock_put(ip->i_gl); 780 goto fail_gunlock; 781 782 fail_gunlock2: 783 gfs2_glock_dq_uninit(ghs + 1); 784 fail_free_inode: 785 if (ip->i_gl) 786 gfs2_glock_put(ip->i_gl); 787 gfs2_rs_delete(ip, NULL); 788 fail_free_acls: 789 if (default_acl) 790 posix_acl_release(default_acl); 791 if (acl) 792 posix_acl_release(acl); 793 fail_free_vfs_inode: 794 free_vfs_inode = 1; 795 fail_gunlock: 796 gfs2_dir_no_add(&da); 797 gfs2_glock_dq_uninit(ghs); 798 if (inode && !IS_ERR(inode)) { 799 clear_nlink(inode); 800 if (!free_vfs_inode) 801 mark_inode_dirty(inode); 802 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 803 &GFS2_I(inode)->i_flags); 804 iput(inode); 805 } 806 fail: 807 return error; 808 } 809 810 /** 811 * gfs2_create - Create a file 812 * @dir: The directory in which to create the file 813 * @dentry: The dentry of the new file 814 * @mode: The mode of the new file 815 * 816 * Returns: errno 817 */ 818 819 static int gfs2_create(struct inode *dir, struct dentry *dentry, 820 umode_t mode, bool excl) 821 { 822 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 823 } 824 825 /** 826 * __gfs2_lookup - Look up a filename in a directory and return its inode 827 * @dir: The directory inode 828 * @dentry: The dentry of the new inode 829 * @file: File to be opened 830 * @opened: atomic_open flags 831 * 832 * 833 * Returns: errno 834 */ 835 836 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 837 struct file *file, int *opened) 838 { 839 struct inode *inode; 840 struct dentry *d; 841 struct gfs2_holder gh; 842 struct gfs2_glock *gl; 843 int error; 844 845 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 846 if (inode == NULL) { 847 d_add(dentry, NULL); 848 return NULL; 849 } 850 if (IS_ERR(inode)) 851 return ERR_CAST(inode); 852 853 gl = GFS2_I(inode)->i_gl; 854 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 855 if (error) { 856 iput(inode); 857 return ERR_PTR(error); 858 } 859 860 d = d_splice_alias(inode, dentry); 861 if (IS_ERR(d)) { 862 gfs2_glock_dq_uninit(&gh); 863 return d; 864 } 865 if (file && S_ISREG(inode->i_mode)) 866 error = finish_open(file, dentry, gfs2_open_common, opened); 867 868 gfs2_glock_dq_uninit(&gh); 869 if (error) { 870 dput(d); 871 return ERR_PTR(error); 872 } 873 return d; 874 } 875 876 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 877 unsigned flags) 878 { 879 return __gfs2_lookup(dir, dentry, NULL, NULL); 880 } 881 882 /** 883 * gfs2_link - Link to a file 884 * @old_dentry: The inode to link 885 * @dir: Add link to this directory 886 * @dentry: The name of the link 887 * 888 * Link the inode in "old_dentry" into the directory "dir" with the 889 * name in "dentry". 890 * 891 * Returns: errno 892 */ 893 894 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 895 struct dentry *dentry) 896 { 897 struct gfs2_inode *dip = GFS2_I(dir); 898 struct gfs2_sbd *sdp = GFS2_SB(dir); 899 struct inode *inode = old_dentry->d_inode; 900 struct gfs2_inode *ip = GFS2_I(inode); 901 struct gfs2_holder ghs[2]; 902 struct buffer_head *dibh; 903 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 904 int error; 905 906 if (S_ISDIR(inode->i_mode)) 907 return -EPERM; 908 909 error = gfs2_rs_alloc(dip); 910 if (error) 911 return error; 912 913 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 914 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 915 916 error = gfs2_glock_nq(ghs); /* parent */ 917 if (error) 918 goto out_parent; 919 920 error = gfs2_glock_nq(ghs + 1); /* child */ 921 if (error) 922 goto out_child; 923 924 error = -ENOENT; 925 if (inode->i_nlink == 0) 926 goto out_gunlock; 927 928 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 929 if (error) 930 goto out_gunlock; 931 932 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 933 switch (error) { 934 case -ENOENT: 935 break; 936 case 0: 937 error = -EEXIST; 938 default: 939 goto out_gunlock; 940 } 941 942 error = -EINVAL; 943 if (!dip->i_inode.i_nlink) 944 goto out_gunlock; 945 error = -EFBIG; 946 if (dip->i_entries == (u32)-1) 947 goto out_gunlock; 948 error = -EPERM; 949 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 950 goto out_gunlock; 951 error = -EINVAL; 952 if (!ip->i_inode.i_nlink) 953 goto out_gunlock; 954 error = -EMLINK; 955 if (ip->i_inode.i_nlink == (u32)-1) 956 goto out_gunlock; 957 958 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 959 if (error < 0) 960 goto out_gunlock; 961 962 if (da.nr_blocks) { 963 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 964 error = gfs2_quota_lock_check(dip); 965 if (error) 966 goto out_gunlock; 967 968 error = gfs2_inplace_reserve(dip, &ap); 969 if (error) 970 goto out_gunlock_q; 971 972 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 973 if (error) 974 goto out_ipres; 975 } else { 976 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 977 if (error) 978 goto out_ipres; 979 } 980 981 error = gfs2_meta_inode_buffer(ip, &dibh); 982 if (error) 983 goto out_end_trans; 984 985 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 986 if (error) 987 goto out_brelse; 988 989 gfs2_trans_add_meta(ip->i_gl, dibh); 990 inc_nlink(&ip->i_inode); 991 ip->i_inode.i_ctime = CURRENT_TIME; 992 ihold(inode); 993 d_instantiate(dentry, inode); 994 mark_inode_dirty(inode); 995 996 out_brelse: 997 brelse(dibh); 998 out_end_trans: 999 gfs2_trans_end(sdp); 1000 out_ipres: 1001 if (da.nr_blocks) 1002 gfs2_inplace_release(dip); 1003 out_gunlock_q: 1004 if (da.nr_blocks) 1005 gfs2_quota_unlock(dip); 1006 out_gunlock: 1007 gfs2_dir_no_add(&da); 1008 gfs2_glock_dq(ghs + 1); 1009 out_child: 1010 gfs2_glock_dq(ghs); 1011 out_parent: 1012 gfs2_holder_uninit(ghs); 1013 gfs2_holder_uninit(ghs + 1); 1014 return error; 1015 } 1016 1017 /* 1018 * gfs2_unlink_ok - check to see that a inode is still in a directory 1019 * @dip: the directory 1020 * @name: the name of the file 1021 * @ip: the inode 1022 * 1023 * Assumes that the lock on (at least) @dip is held. 1024 * 1025 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1026 */ 1027 1028 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1029 const struct gfs2_inode *ip) 1030 { 1031 int error; 1032 1033 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1034 return -EPERM; 1035 1036 if ((dip->i_inode.i_mode & S_ISVTX) && 1037 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1038 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1039 return -EPERM; 1040 1041 if (IS_APPEND(&dip->i_inode)) 1042 return -EPERM; 1043 1044 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1045 if (error) 1046 return error; 1047 1048 error = gfs2_dir_check(&dip->i_inode, name, ip); 1049 if (error) 1050 return error; 1051 1052 return 0; 1053 } 1054 1055 /** 1056 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1057 * @dip: The parent directory 1058 * @name: The name of the entry in the parent directory 1059 * @inode: The inode to be removed 1060 * 1061 * Called with all the locks and in a transaction. This will only be 1062 * called for a directory after it has been checked to ensure it is empty. 1063 * 1064 * Returns: 0 on success, or an error 1065 */ 1066 1067 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1068 const struct dentry *dentry) 1069 { 1070 struct inode *inode = dentry->d_inode; 1071 struct gfs2_inode *ip = GFS2_I(inode); 1072 int error; 1073 1074 error = gfs2_dir_del(dip, dentry); 1075 if (error) 1076 return error; 1077 1078 ip->i_entries = 0; 1079 inode->i_ctime = CURRENT_TIME; 1080 if (S_ISDIR(inode->i_mode)) 1081 clear_nlink(inode); 1082 else 1083 drop_nlink(inode); 1084 mark_inode_dirty(inode); 1085 if (inode->i_nlink == 0) 1086 gfs2_unlink_di(inode); 1087 return 0; 1088 } 1089 1090 1091 /** 1092 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1093 * @dir: The inode of the directory containing the inode to unlink 1094 * @dentry: The file itself 1095 * 1096 * This routine uses the type of the inode as a flag to figure out 1097 * whether this is an unlink or an rmdir. 1098 * 1099 * Returns: errno 1100 */ 1101 1102 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1103 { 1104 struct gfs2_inode *dip = GFS2_I(dir); 1105 struct gfs2_sbd *sdp = GFS2_SB(dir); 1106 struct inode *inode = dentry->d_inode; 1107 struct gfs2_inode *ip = GFS2_I(inode); 1108 struct gfs2_holder ghs[3]; 1109 struct gfs2_rgrpd *rgd; 1110 int error; 1111 1112 error = gfs2_rindex_update(sdp); 1113 if (error) 1114 return error; 1115 1116 error = -EROFS; 1117 1118 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1119 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1120 1121 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1122 if (!rgd) 1123 goto out_inodes; 1124 1125 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1126 1127 1128 error = gfs2_glock_nq(ghs); /* parent */ 1129 if (error) 1130 goto out_parent; 1131 1132 error = gfs2_glock_nq(ghs + 1); /* child */ 1133 if (error) 1134 goto out_child; 1135 1136 error = -ENOENT; 1137 if (inode->i_nlink == 0) 1138 goto out_rgrp; 1139 1140 if (S_ISDIR(inode->i_mode)) { 1141 error = -ENOTEMPTY; 1142 if (ip->i_entries > 2 || inode->i_nlink > 2) 1143 goto out_rgrp; 1144 } 1145 1146 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1147 if (error) 1148 goto out_rgrp; 1149 1150 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1151 if (error) 1152 goto out_gunlock; 1153 1154 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1155 if (error) 1156 goto out_end_trans; 1157 1158 error = gfs2_unlink_inode(dip, dentry); 1159 1160 out_end_trans: 1161 gfs2_trans_end(sdp); 1162 out_gunlock: 1163 gfs2_glock_dq(ghs + 2); 1164 out_rgrp: 1165 gfs2_glock_dq(ghs + 1); 1166 out_child: 1167 gfs2_glock_dq(ghs); 1168 out_parent: 1169 gfs2_holder_uninit(ghs + 2); 1170 out_inodes: 1171 gfs2_holder_uninit(ghs + 1); 1172 gfs2_holder_uninit(ghs); 1173 return error; 1174 } 1175 1176 /** 1177 * gfs2_symlink - Create a symlink 1178 * @dir: The directory to create the symlink in 1179 * @dentry: The dentry to put the symlink in 1180 * @symname: The thing which the link points to 1181 * 1182 * Returns: errno 1183 */ 1184 1185 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1186 const char *symname) 1187 { 1188 struct gfs2_sbd *sdp = GFS2_SB(dir); 1189 unsigned int size; 1190 1191 size = strlen(symname); 1192 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1193 return -ENAMETOOLONG; 1194 1195 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1196 } 1197 1198 /** 1199 * gfs2_mkdir - Make a directory 1200 * @dir: The parent directory of the new one 1201 * @dentry: The dentry of the new directory 1202 * @mode: The mode of the new directory 1203 * 1204 * Returns: errno 1205 */ 1206 1207 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1208 { 1209 struct gfs2_sbd *sdp = GFS2_SB(dir); 1210 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1211 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1212 } 1213 1214 /** 1215 * gfs2_mknod - Make a special file 1216 * @dir: The directory in which the special file will reside 1217 * @dentry: The dentry of the special file 1218 * @mode: The mode of the special file 1219 * @dev: The device specification of the special file 1220 * 1221 */ 1222 1223 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1224 dev_t dev) 1225 { 1226 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1227 } 1228 1229 /** 1230 * gfs2_atomic_open - Atomically open a file 1231 * @dir: The directory 1232 * @dentry: The proposed new entry 1233 * @file: The proposed new struct file 1234 * @flags: open flags 1235 * @mode: File mode 1236 * @opened: Flag to say whether the file has been opened or not 1237 * 1238 * Returns: error code or 0 for success 1239 */ 1240 1241 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1242 struct file *file, unsigned flags, 1243 umode_t mode, int *opened) 1244 { 1245 struct dentry *d; 1246 bool excl = !!(flags & O_EXCL); 1247 1248 if (!d_unhashed(dentry)) 1249 goto skip_lookup; 1250 1251 d = __gfs2_lookup(dir, dentry, file, opened); 1252 if (IS_ERR(d)) 1253 return PTR_ERR(d); 1254 if (d != NULL) 1255 dentry = d; 1256 if (dentry->d_inode) { 1257 if (!(*opened & FILE_OPENED)) { 1258 if (d == NULL) 1259 dget(dentry); 1260 return finish_no_open(file, dentry); 1261 } 1262 dput(d); 1263 return 0; 1264 } 1265 1266 BUG_ON(d != NULL); 1267 1268 skip_lookup: 1269 if (!(flags & O_CREAT)) 1270 return -ENOENT; 1271 1272 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1273 } 1274 1275 /* 1276 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1277 * @this: move this 1278 * @to: to here 1279 * 1280 * Follow @to back to the root and make sure we don't encounter @this 1281 * Assumes we already hold the rename lock. 1282 * 1283 * Returns: errno 1284 */ 1285 1286 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1287 { 1288 struct inode *dir = &to->i_inode; 1289 struct super_block *sb = dir->i_sb; 1290 struct inode *tmp; 1291 int error = 0; 1292 1293 igrab(dir); 1294 1295 for (;;) { 1296 if (dir == &this->i_inode) { 1297 error = -EINVAL; 1298 break; 1299 } 1300 if (dir == sb->s_root->d_inode) { 1301 error = 0; 1302 break; 1303 } 1304 1305 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1306 if (!tmp) { 1307 error = -ENOENT; 1308 break; 1309 } 1310 if (IS_ERR(tmp)) { 1311 error = PTR_ERR(tmp); 1312 break; 1313 } 1314 1315 iput(dir); 1316 dir = tmp; 1317 } 1318 1319 iput(dir); 1320 1321 return error; 1322 } 1323 1324 /** 1325 * gfs2_rename - Rename a file 1326 * @odir: Parent directory of old file name 1327 * @odentry: The old dentry of the file 1328 * @ndir: Parent directory of new file name 1329 * @ndentry: The new dentry of the file 1330 * 1331 * Returns: errno 1332 */ 1333 1334 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1335 struct inode *ndir, struct dentry *ndentry) 1336 { 1337 struct gfs2_inode *odip = GFS2_I(odir); 1338 struct gfs2_inode *ndip = GFS2_I(ndir); 1339 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1340 struct gfs2_inode *nip = NULL; 1341 struct gfs2_sbd *sdp = GFS2_SB(odir); 1342 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1343 struct gfs2_rgrpd *nrgd; 1344 unsigned int num_gh; 1345 int dir_rename = 0; 1346 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1347 unsigned int x; 1348 int error; 1349 1350 if (ndentry->d_inode) { 1351 nip = GFS2_I(ndentry->d_inode); 1352 if (ip == nip) 1353 return 0; 1354 } 1355 1356 error = gfs2_rindex_update(sdp); 1357 if (error) 1358 return error; 1359 1360 error = gfs2_rs_alloc(ndip); 1361 if (error) 1362 return error; 1363 1364 if (odip != ndip) { 1365 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1366 0, &r_gh); 1367 if (error) 1368 goto out; 1369 1370 if (S_ISDIR(ip->i_inode.i_mode)) { 1371 dir_rename = 1; 1372 /* don't move a dirctory into it's subdir */ 1373 error = gfs2_ok_to_move(ip, ndip); 1374 if (error) 1375 goto out_gunlock_r; 1376 } 1377 } 1378 1379 num_gh = 1; 1380 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1381 if (odip != ndip) { 1382 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1383 num_gh++; 1384 } 1385 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1386 num_gh++; 1387 1388 if (nip) { 1389 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1390 num_gh++; 1391 /* grab the resource lock for unlink flag twiddling 1392 * this is the case of the target file already existing 1393 * so we unlink before doing the rename 1394 */ 1395 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1396 if (nrgd) 1397 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1398 } 1399 1400 for (x = 0; x < num_gh; x++) { 1401 error = gfs2_glock_nq(ghs + x); 1402 if (error) 1403 goto out_gunlock; 1404 } 1405 1406 error = -ENOENT; 1407 if (ip->i_inode.i_nlink == 0) 1408 goto out_gunlock; 1409 1410 /* Check out the old directory */ 1411 1412 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1413 if (error) 1414 goto out_gunlock; 1415 1416 /* Check out the new directory */ 1417 1418 if (nip) { 1419 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1420 if (error) 1421 goto out_gunlock; 1422 1423 if (nip->i_inode.i_nlink == 0) { 1424 error = -EAGAIN; 1425 goto out_gunlock; 1426 } 1427 1428 if (S_ISDIR(nip->i_inode.i_mode)) { 1429 if (nip->i_entries < 2) { 1430 gfs2_consist_inode(nip); 1431 error = -EIO; 1432 goto out_gunlock; 1433 } 1434 if (nip->i_entries > 2) { 1435 error = -ENOTEMPTY; 1436 goto out_gunlock; 1437 } 1438 } 1439 } else { 1440 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1441 if (error) 1442 goto out_gunlock; 1443 1444 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1445 switch (error) { 1446 case -ENOENT: 1447 error = 0; 1448 break; 1449 case 0: 1450 error = -EEXIST; 1451 default: 1452 goto out_gunlock; 1453 }; 1454 1455 if (odip != ndip) { 1456 if (!ndip->i_inode.i_nlink) { 1457 error = -ENOENT; 1458 goto out_gunlock; 1459 } 1460 if (ndip->i_entries == (u32)-1) { 1461 error = -EFBIG; 1462 goto out_gunlock; 1463 } 1464 if (S_ISDIR(ip->i_inode.i_mode) && 1465 ndip->i_inode.i_nlink == (u32)-1) { 1466 error = -EMLINK; 1467 goto out_gunlock; 1468 } 1469 } 1470 } 1471 1472 /* Check out the dir to be renamed */ 1473 1474 if (dir_rename) { 1475 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1476 if (error) 1477 goto out_gunlock; 1478 } 1479 1480 if (nip == NULL) { 1481 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1482 if (error) 1483 goto out_gunlock; 1484 } 1485 1486 if (da.nr_blocks) { 1487 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1488 error = gfs2_quota_lock_check(ndip); 1489 if (error) 1490 goto out_gunlock; 1491 1492 error = gfs2_inplace_reserve(ndip, &ap); 1493 if (error) 1494 goto out_gunlock_q; 1495 1496 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1497 4 * RES_LEAF + 4, 0); 1498 if (error) 1499 goto out_ipreserv; 1500 } else { 1501 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1502 5 * RES_LEAF + 4, 0); 1503 if (error) 1504 goto out_gunlock; 1505 } 1506 1507 /* Remove the target file, if it exists */ 1508 1509 if (nip) 1510 error = gfs2_unlink_inode(ndip, ndentry); 1511 1512 if (dir_rename) { 1513 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1514 if (error) 1515 goto out_end_trans; 1516 } else { 1517 struct buffer_head *dibh; 1518 error = gfs2_meta_inode_buffer(ip, &dibh); 1519 if (error) 1520 goto out_end_trans; 1521 ip->i_inode.i_ctime = CURRENT_TIME; 1522 gfs2_trans_add_meta(ip->i_gl, dibh); 1523 gfs2_dinode_out(ip, dibh->b_data); 1524 brelse(dibh); 1525 } 1526 1527 error = gfs2_dir_del(odip, odentry); 1528 if (error) 1529 goto out_end_trans; 1530 1531 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1532 if (error) 1533 goto out_end_trans; 1534 1535 out_end_trans: 1536 gfs2_trans_end(sdp); 1537 out_ipreserv: 1538 if (da.nr_blocks) 1539 gfs2_inplace_release(ndip); 1540 out_gunlock_q: 1541 if (da.nr_blocks) 1542 gfs2_quota_unlock(ndip); 1543 out_gunlock: 1544 gfs2_dir_no_add(&da); 1545 while (x--) { 1546 gfs2_glock_dq(ghs + x); 1547 gfs2_holder_uninit(ghs + x); 1548 } 1549 out_gunlock_r: 1550 if (r_gh.gh_gl) 1551 gfs2_glock_dq_uninit(&r_gh); 1552 out: 1553 return error; 1554 } 1555 1556 /** 1557 * gfs2_follow_link - Follow a symbolic link 1558 * @dentry: The dentry of the link 1559 * @nd: Data that we pass to vfs_follow_link() 1560 * 1561 * This can handle symlinks of any size. 1562 * 1563 * Returns: 0 on success or error code 1564 */ 1565 1566 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1567 { 1568 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1569 struct gfs2_holder i_gh; 1570 struct buffer_head *dibh; 1571 unsigned int size; 1572 char *buf; 1573 int error; 1574 1575 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1576 error = gfs2_glock_nq(&i_gh); 1577 if (error) { 1578 gfs2_holder_uninit(&i_gh); 1579 nd_set_link(nd, ERR_PTR(error)); 1580 return NULL; 1581 } 1582 1583 size = (unsigned int)i_size_read(&ip->i_inode); 1584 if (size == 0) { 1585 gfs2_consist_inode(ip); 1586 buf = ERR_PTR(-EIO); 1587 goto out; 1588 } 1589 1590 error = gfs2_meta_inode_buffer(ip, &dibh); 1591 if (error) { 1592 buf = ERR_PTR(error); 1593 goto out; 1594 } 1595 1596 buf = kzalloc(size + 1, GFP_NOFS); 1597 if (!buf) 1598 buf = ERR_PTR(-ENOMEM); 1599 else 1600 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1601 brelse(dibh); 1602 out: 1603 gfs2_glock_dq_uninit(&i_gh); 1604 nd_set_link(nd, buf); 1605 return NULL; 1606 } 1607 1608 /** 1609 * gfs2_permission - 1610 * @inode: The inode 1611 * @mask: The mask to be tested 1612 * @flags: Indicates whether this is an RCU path walk or not 1613 * 1614 * This may be called from the VFS directly, or from within GFS2 with the 1615 * inode locked, so we look to see if the glock is already locked and only 1616 * lock the glock if its not already been done. 1617 * 1618 * Returns: errno 1619 */ 1620 1621 int gfs2_permission(struct inode *inode, int mask) 1622 { 1623 struct gfs2_inode *ip; 1624 struct gfs2_holder i_gh; 1625 struct gfs2_sbd *sdp = GFS2_SB(inode); 1626 int error; 1627 int unlock = 0; 1628 int frozen_root = 0; 1629 1630 1631 ip = GFS2_I(inode); 1632 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1633 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1634 inode == sdp->sd_root_dir->d_inode && 1635 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1636 frozen_root = 1; 1637 else { 1638 if (mask & MAY_NOT_BLOCK) 1639 return -ECHILD; 1640 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1641 if (error) 1642 return error; 1643 unlock = 1; 1644 } 1645 } 1646 1647 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1648 error = -EACCES; 1649 else 1650 error = generic_permission(inode, mask); 1651 if (unlock) 1652 gfs2_glock_dq_uninit(&i_gh); 1653 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1654 wake_up(&sdp->sd_frozen_root_wait); 1655 1656 return error; 1657 } 1658 1659 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1660 { 1661 setattr_copy(inode, attr); 1662 mark_inode_dirty(inode); 1663 return 0; 1664 } 1665 1666 /** 1667 * gfs2_setattr_simple - 1668 * @ip: 1669 * @attr: 1670 * 1671 * Returns: errno 1672 */ 1673 1674 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1675 { 1676 int error; 1677 1678 if (current->journal_info) 1679 return __gfs2_setattr_simple(inode, attr); 1680 1681 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1682 if (error) 1683 return error; 1684 1685 error = __gfs2_setattr_simple(inode, attr); 1686 gfs2_trans_end(GFS2_SB(inode)); 1687 return error; 1688 } 1689 1690 static int setattr_chown(struct inode *inode, struct iattr *attr) 1691 { 1692 struct gfs2_inode *ip = GFS2_I(inode); 1693 struct gfs2_sbd *sdp = GFS2_SB(inode); 1694 kuid_t ouid, nuid; 1695 kgid_t ogid, ngid; 1696 int error; 1697 1698 ouid = inode->i_uid; 1699 ogid = inode->i_gid; 1700 nuid = attr->ia_uid; 1701 ngid = attr->ia_gid; 1702 1703 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1704 ouid = nuid = NO_UID_QUOTA_CHANGE; 1705 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1706 ogid = ngid = NO_GID_QUOTA_CHANGE; 1707 1708 error = get_write_access(inode); 1709 if (error) 1710 return error; 1711 1712 error = gfs2_rs_alloc(ip); 1713 if (error) 1714 goto out; 1715 1716 error = gfs2_rindex_update(sdp); 1717 if (error) 1718 goto out; 1719 1720 error = gfs2_quota_lock(ip, nuid, ngid); 1721 if (error) 1722 goto out; 1723 1724 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1725 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1726 error = gfs2_quota_check(ip, nuid, ngid); 1727 if (error) 1728 goto out_gunlock_q; 1729 } 1730 1731 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1732 if (error) 1733 goto out_gunlock_q; 1734 1735 error = gfs2_setattr_simple(inode, attr); 1736 if (error) 1737 goto out_end_trans; 1738 1739 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1740 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1741 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1742 gfs2_quota_change(ip, -blocks, ouid, ogid); 1743 gfs2_quota_change(ip, blocks, nuid, ngid); 1744 } 1745 1746 out_end_trans: 1747 gfs2_trans_end(sdp); 1748 out_gunlock_q: 1749 gfs2_quota_unlock(ip); 1750 out: 1751 put_write_access(inode); 1752 return error; 1753 } 1754 1755 /** 1756 * gfs2_setattr - Change attributes on an inode 1757 * @dentry: The dentry which is changing 1758 * @attr: The structure describing the change 1759 * 1760 * The VFS layer wants to change one or more of an inodes attributes. Write 1761 * that change out to disk. 1762 * 1763 * Returns: errno 1764 */ 1765 1766 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1767 { 1768 struct inode *inode = dentry->d_inode; 1769 struct gfs2_inode *ip = GFS2_I(inode); 1770 struct gfs2_holder i_gh; 1771 int error; 1772 1773 error = gfs2_rs_alloc(ip); 1774 if (error) 1775 return error; 1776 1777 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1778 if (error) 1779 return error; 1780 1781 error = -EPERM; 1782 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1783 goto out; 1784 1785 error = inode_change_ok(inode, attr); 1786 if (error) 1787 goto out; 1788 1789 if (attr->ia_valid & ATTR_SIZE) 1790 error = gfs2_setattr_size(inode, attr->ia_size); 1791 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1792 error = setattr_chown(inode, attr); 1793 else { 1794 error = gfs2_setattr_simple(inode, attr); 1795 if (!error && attr->ia_valid & ATTR_MODE) 1796 error = posix_acl_chmod(inode, inode->i_mode); 1797 } 1798 1799 out: 1800 if (!error) 1801 mark_inode_dirty(inode); 1802 gfs2_glock_dq_uninit(&i_gh); 1803 return error; 1804 } 1805 1806 /** 1807 * gfs2_getattr - Read out an inode's attributes 1808 * @mnt: The vfsmount the inode is being accessed from 1809 * @dentry: The dentry to stat 1810 * @stat: The inode's stats 1811 * 1812 * This may be called from the VFS directly, or from within GFS2 with the 1813 * inode locked, so we look to see if the glock is already locked and only 1814 * lock the glock if its not already been done. Note that its the NFS 1815 * readdirplus operation which causes this to be called (from filldir) 1816 * with the glock already held. 1817 * 1818 * Returns: errno 1819 */ 1820 1821 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1822 struct kstat *stat) 1823 { 1824 struct inode *inode = dentry->d_inode; 1825 struct gfs2_inode *ip = GFS2_I(inode); 1826 struct gfs2_holder gh; 1827 struct gfs2_sbd *sdp = GFS2_SB(inode); 1828 int error; 1829 int unlock = 0; 1830 int frozen_root = 0; 1831 1832 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1833 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1834 inode == sdp->sd_root_dir->d_inode && 1835 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1836 frozen_root = 1; 1837 else { 1838 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1839 if (error) 1840 return error; 1841 unlock = 1; 1842 } 1843 } 1844 1845 generic_fillattr(inode, stat); 1846 if (unlock) 1847 gfs2_glock_dq_uninit(&gh); 1848 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1849 wake_up(&sdp->sd_frozen_root_wait); 1850 1851 return 0; 1852 } 1853 1854 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1855 const void *data, size_t size, int flags) 1856 { 1857 struct inode *inode = dentry->d_inode; 1858 struct gfs2_inode *ip = GFS2_I(inode); 1859 struct gfs2_holder gh; 1860 int ret; 1861 1862 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1863 ret = gfs2_glock_nq(&gh); 1864 if (ret == 0) { 1865 ret = gfs2_rs_alloc(ip); 1866 if (ret == 0) 1867 ret = generic_setxattr(dentry, name, data, size, flags); 1868 gfs2_glock_dq(&gh); 1869 } 1870 gfs2_holder_uninit(&gh); 1871 return ret; 1872 } 1873 1874 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1875 void *data, size_t size) 1876 { 1877 struct inode *inode = dentry->d_inode; 1878 struct gfs2_inode *ip = GFS2_I(inode); 1879 struct gfs2_holder gh; 1880 int ret; 1881 1882 /* For selinux during lookup */ 1883 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1884 return generic_getxattr(dentry, name, data, size); 1885 1886 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1887 ret = gfs2_glock_nq(&gh); 1888 if (ret == 0) { 1889 ret = generic_getxattr(dentry, name, data, size); 1890 gfs2_glock_dq(&gh); 1891 } 1892 gfs2_holder_uninit(&gh); 1893 return ret; 1894 } 1895 1896 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1897 { 1898 struct inode *inode = dentry->d_inode; 1899 struct gfs2_inode *ip = GFS2_I(inode); 1900 struct gfs2_holder gh; 1901 int ret; 1902 1903 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1904 ret = gfs2_glock_nq(&gh); 1905 if (ret == 0) { 1906 ret = gfs2_rs_alloc(ip); 1907 if (ret == 0) 1908 ret = generic_removexattr(dentry, name); 1909 gfs2_glock_dq(&gh); 1910 } 1911 gfs2_holder_uninit(&gh); 1912 return ret; 1913 } 1914 1915 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1916 u64 start, u64 len) 1917 { 1918 struct gfs2_inode *ip = GFS2_I(inode); 1919 struct gfs2_holder gh; 1920 int ret; 1921 1922 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1923 if (ret) 1924 return ret; 1925 1926 mutex_lock(&inode->i_mutex); 1927 1928 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1929 if (ret) 1930 goto out; 1931 1932 if (gfs2_is_stuffed(ip)) { 1933 u64 phys = ip->i_no_addr << inode->i_blkbits; 1934 u64 size = i_size_read(inode); 1935 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1936 FIEMAP_EXTENT_DATA_INLINE; 1937 phys += sizeof(struct gfs2_dinode); 1938 phys += start; 1939 if (start + len > size) 1940 len = size - start; 1941 if (start < size) 1942 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1943 len, flags); 1944 if (ret == 1) 1945 ret = 0; 1946 } else { 1947 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1948 gfs2_block_map); 1949 } 1950 1951 gfs2_glock_dq_uninit(&gh); 1952 out: 1953 mutex_unlock(&inode->i_mutex); 1954 return ret; 1955 } 1956 1957 const struct inode_operations gfs2_file_iops = { 1958 .permission = gfs2_permission, 1959 .setattr = gfs2_setattr, 1960 .getattr = gfs2_getattr, 1961 .setxattr = gfs2_setxattr, 1962 .getxattr = gfs2_getxattr, 1963 .listxattr = gfs2_listxattr, 1964 .removexattr = gfs2_removexattr, 1965 .fiemap = gfs2_fiemap, 1966 .get_acl = gfs2_get_acl, 1967 .set_acl = gfs2_set_acl, 1968 }; 1969 1970 const struct inode_operations gfs2_dir_iops = { 1971 .create = gfs2_create, 1972 .lookup = gfs2_lookup, 1973 .link = gfs2_link, 1974 .unlink = gfs2_unlink, 1975 .symlink = gfs2_symlink, 1976 .mkdir = gfs2_mkdir, 1977 .rmdir = gfs2_unlink, 1978 .mknod = gfs2_mknod, 1979 .rename = gfs2_rename, 1980 .permission = gfs2_permission, 1981 .setattr = gfs2_setattr, 1982 .getattr = gfs2_getattr, 1983 .setxattr = gfs2_setxattr, 1984 .getxattr = gfs2_getxattr, 1985 .listxattr = gfs2_listxattr, 1986 .removexattr = gfs2_removexattr, 1987 .fiemap = gfs2_fiemap, 1988 .get_acl = gfs2_get_acl, 1989 .set_acl = gfs2_set_acl, 1990 .atomic_open = gfs2_atomic_open, 1991 }; 1992 1993 const struct inode_operations gfs2_symlink_iops = { 1994 .readlink = generic_readlink, 1995 .follow_link = gfs2_follow_link, 1996 .put_link = kfree_put_link, 1997 .permission = gfs2_permission, 1998 .setattr = gfs2_setattr, 1999 .getattr = gfs2_getattr, 2000 .setxattr = gfs2_setxattr, 2001 .getxattr = gfs2_getxattr, 2002 .listxattr = gfs2_listxattr, 2003 .removexattr = gfs2_removexattr, 2004 .fiemap = gfs2_fiemap, 2005 }; 2006 2007