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 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 575 const struct qstr *qstr) 576 { 577 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 578 &gfs2_initxattrs, NULL); 579 } 580 581 /** 582 * gfs2_create_inode - Create a new inode 583 * @dir: The parent directory 584 * @dentry: The new dentry 585 * @file: If non-NULL, the file which is being opened 586 * @mode: The permissions on the new inode 587 * @dev: For device nodes, this is the device number 588 * @symname: For symlinks, this is the link destination 589 * @size: The initial size of the inode (ignored for directories) 590 * 591 * Returns: 0 on success, or error code 592 */ 593 594 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 595 struct file *file, 596 umode_t mode, dev_t dev, const char *symname, 597 unsigned int size, int excl, int *opened) 598 { 599 const struct qstr *name = &dentry->d_name; 600 struct posix_acl *default_acl, *acl; 601 struct gfs2_holder ghs[2]; 602 struct inode *inode = NULL; 603 struct gfs2_inode *dip = GFS2_I(dir), *ip; 604 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 605 struct gfs2_glock *io_gl; 606 struct dentry *d; 607 int error; 608 u32 aflags = 0; 609 unsigned blocks = 1; 610 struct gfs2_diradd da = { .bh = NULL, }; 611 612 if (!name->len || name->len > GFS2_FNAMESIZE) 613 return -ENAMETOOLONG; 614 615 error = gfs2_rs_alloc(dip); 616 if (error) 617 return error; 618 619 error = gfs2_rindex_update(sdp); 620 if (error) 621 return error; 622 623 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 624 if (error) 625 goto fail; 626 627 error = create_ok(dip, name, mode); 628 if (error) 629 goto fail_gunlock; 630 631 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 632 error = PTR_ERR(inode); 633 if (!IS_ERR(inode)) { 634 d = d_splice_alias(inode, dentry); 635 error = PTR_ERR(d); 636 if (IS_ERR(d)) 637 goto fail_gunlock; 638 error = 0; 639 if (file) { 640 if (S_ISREG(inode->i_mode)) { 641 WARN_ON(d != NULL); 642 error = finish_open(file, dentry, gfs2_open_common, opened); 643 } else { 644 error = finish_no_open(file, d); 645 } 646 } else { 647 dput(d); 648 } 649 gfs2_glock_dq_uninit(ghs); 650 return error; 651 } else if (error != -ENOENT) { 652 goto fail_gunlock; 653 } 654 655 error = gfs2_diradd_alloc_required(dir, name, &da); 656 if (error < 0) 657 goto fail_gunlock; 658 659 inode = new_inode(sdp->sd_vfs); 660 error = -ENOMEM; 661 if (!inode) 662 goto fail_gunlock; 663 664 error = posix_acl_create(dir, &mode, &default_acl, &acl); 665 if (error) 666 goto fail_free_vfs_inode; 667 668 ip = GFS2_I(inode); 669 error = gfs2_rs_alloc(ip); 670 if (error) 671 goto fail_free_acls; 672 673 inode->i_mode = mode; 674 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 675 inode->i_rdev = dev; 676 inode->i_size = size; 677 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 678 gfs2_set_inode_blocks(inode, 1); 679 munge_mode_uid_gid(dip, inode); 680 ip->i_goal = dip->i_goal; 681 ip->i_diskflags = 0; 682 ip->i_eattr = 0; 683 ip->i_height = 0; 684 ip->i_depth = 0; 685 ip->i_entries = 0; 686 687 switch(mode & S_IFMT) { 688 case S_IFREG: 689 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 690 gfs2_tune_get(sdp, gt_new_files_jdata)) 691 ip->i_diskflags |= GFS2_DIF_JDATA; 692 gfs2_set_aops(inode); 693 break; 694 case S_IFDIR: 695 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 696 ip->i_diskflags |= GFS2_DIF_JDATA; 697 ip->i_entries = 2; 698 break; 699 } 700 gfs2_set_inode_flags(inode); 701 702 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 703 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 704 aflags |= GFS2_AF_ORLOV; 705 706 if (default_acl || acl) 707 blocks++; 708 709 error = alloc_dinode(ip, aflags, &blocks); 710 if (error) 711 goto fail_free_inode; 712 713 gfs2_set_inode_blocks(inode, blocks); 714 715 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 716 if (error) 717 goto fail_free_inode; 718 719 ip->i_gl->gl_object = ip; 720 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 721 if (error) 722 goto fail_free_inode; 723 724 error = gfs2_trans_begin(sdp, blocks, 0); 725 if (error) 726 goto fail_gunlock2; 727 728 if (blocks > 1) { 729 ip->i_eattr = ip->i_no_addr + 1; 730 gfs2_init_xattr(ip); 731 } 732 init_dinode(dip, ip, symname); 733 gfs2_trans_end(sdp); 734 735 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 736 if (error) 737 goto fail_gunlock2; 738 739 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 740 if (error) 741 goto fail_gunlock2; 742 743 ip->i_iopen_gh.gh_gl->gl_object = ip; 744 gfs2_glock_put(io_gl); 745 gfs2_set_iop(inode); 746 insert_inode_hash(inode); 747 748 if (default_acl) { 749 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 750 posix_acl_release(default_acl); 751 } 752 if (acl) { 753 if (!error) 754 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 755 posix_acl_release(acl); 756 } 757 758 if (error) 759 goto fail_gunlock3; 760 761 error = gfs2_security_init(dip, ip, name); 762 if (error) 763 goto fail_gunlock3; 764 765 error = link_dinode(dip, name, ip, &da); 766 if (error) 767 goto fail_gunlock3; 768 769 mark_inode_dirty(inode); 770 d_instantiate(dentry, inode); 771 if (file) { 772 *opened |= FILE_CREATED; 773 error = finish_open(file, dentry, gfs2_open_common, opened); 774 } 775 gfs2_glock_dq_uninit(ghs); 776 gfs2_glock_dq_uninit(ghs + 1); 777 return error; 778 779 fail_gunlock3: 780 gfs2_glock_dq_uninit(ghs + 1); 781 if (ip->i_gl) 782 gfs2_glock_put(ip->i_gl); 783 goto fail_gunlock; 784 785 fail_gunlock2: 786 gfs2_glock_dq_uninit(ghs + 1); 787 fail_free_inode: 788 if (ip->i_gl) 789 gfs2_glock_put(ip->i_gl); 790 gfs2_rs_delete(ip, NULL); 791 fail_free_acls: 792 if (default_acl) 793 posix_acl_release(default_acl); 794 if (acl) 795 posix_acl_release(acl); 796 fail_free_vfs_inode: 797 free_inode_nonrcu(inode); 798 inode = NULL; 799 fail_gunlock: 800 gfs2_dir_no_add(&da); 801 gfs2_glock_dq_uninit(ghs); 802 if (inode && !IS_ERR(inode)) { 803 clear_nlink(inode); 804 mark_inode_dirty(inode); 805 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 806 iput(inode); 807 } 808 fail: 809 return error; 810 } 811 812 /** 813 * gfs2_create - Create a file 814 * @dir: The directory in which to create the file 815 * @dentry: The dentry of the new file 816 * @mode: The mode of the new file 817 * 818 * Returns: errno 819 */ 820 821 static int gfs2_create(struct inode *dir, struct dentry *dentry, 822 umode_t mode, bool excl) 823 { 824 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 825 } 826 827 /** 828 * __gfs2_lookup - Look up a filename in a directory and return its inode 829 * @dir: The directory inode 830 * @dentry: The dentry of the new inode 831 * @file: File to be opened 832 * @opened: atomic_open flags 833 * 834 * 835 * Returns: errno 836 */ 837 838 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 839 struct file *file, int *opened) 840 { 841 struct inode *inode; 842 struct dentry *d; 843 struct gfs2_holder gh; 844 struct gfs2_glock *gl; 845 int error; 846 847 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 848 if (!inode) 849 return NULL; 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 iput(inode); 863 gfs2_glock_dq_uninit(&gh); 864 return d; 865 } 866 if (file && S_ISREG(inode->i_mode)) 867 error = finish_open(file, dentry, gfs2_open_common, opened); 868 869 gfs2_glock_dq_uninit(&gh); 870 if (error) { 871 dput(d); 872 return ERR_PTR(error); 873 } 874 return d; 875 } 876 877 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 878 unsigned flags) 879 { 880 return __gfs2_lookup(dir, dentry, NULL, NULL); 881 } 882 883 /** 884 * gfs2_link - Link to a file 885 * @old_dentry: The inode to link 886 * @dir: Add link to this directory 887 * @dentry: The name of the link 888 * 889 * Link the inode in "old_dentry" into the directory "dir" with the 890 * name in "dentry". 891 * 892 * Returns: errno 893 */ 894 895 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 896 struct dentry *dentry) 897 { 898 struct gfs2_inode *dip = GFS2_I(dir); 899 struct gfs2_sbd *sdp = GFS2_SB(dir); 900 struct inode *inode = old_dentry->d_inode; 901 struct gfs2_inode *ip = GFS2_I(inode); 902 struct gfs2_holder ghs[2]; 903 struct buffer_head *dibh; 904 struct gfs2_diradd da = { .bh = NULL, }; 905 int error; 906 907 if (S_ISDIR(inode->i_mode)) 908 return -EPERM; 909 910 error = gfs2_rs_alloc(dip); 911 if (error) 912 return error; 913 914 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 915 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 916 917 error = gfs2_glock_nq(ghs); /* parent */ 918 if (error) 919 goto out_parent; 920 921 error = gfs2_glock_nq(ghs + 1); /* child */ 922 if (error) 923 goto out_child; 924 925 error = -ENOENT; 926 if (inode->i_nlink == 0) 927 goto out_gunlock; 928 929 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 930 if (error) 931 goto out_gunlock; 932 933 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 934 switch (error) { 935 case -ENOENT: 936 break; 937 case 0: 938 error = -EEXIST; 939 default: 940 goto out_gunlock; 941 } 942 943 error = -EINVAL; 944 if (!dip->i_inode.i_nlink) 945 goto out_gunlock; 946 error = -EFBIG; 947 if (dip->i_entries == (u32)-1) 948 goto out_gunlock; 949 error = -EPERM; 950 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 951 goto out_gunlock; 952 error = -EINVAL; 953 if (!ip->i_inode.i_nlink) 954 goto out_gunlock; 955 error = -EMLINK; 956 if (ip->i_inode.i_nlink == (u32)-1) 957 goto out_gunlock; 958 959 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 960 if (error < 0) 961 goto out_gunlock; 962 963 if (da.nr_blocks) { 964 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 965 error = gfs2_quota_lock_check(dip); 966 if (error) 967 goto out_gunlock; 968 969 error = gfs2_inplace_reserve(dip, &ap); 970 if (error) 971 goto out_gunlock_q; 972 973 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 974 if (error) 975 goto out_ipres; 976 } else { 977 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 978 if (error) 979 goto out_ipres; 980 } 981 982 error = gfs2_meta_inode_buffer(ip, &dibh); 983 if (error) 984 goto out_end_trans; 985 986 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 987 if (error) 988 goto out_brelse; 989 990 gfs2_trans_add_meta(ip->i_gl, dibh); 991 inc_nlink(&ip->i_inode); 992 ip->i_inode.i_ctime = CURRENT_TIME; 993 ihold(inode); 994 d_instantiate(dentry, inode); 995 mark_inode_dirty(inode); 996 997 out_brelse: 998 brelse(dibh); 999 out_end_trans: 1000 gfs2_trans_end(sdp); 1001 out_ipres: 1002 if (da.nr_blocks) 1003 gfs2_inplace_release(dip); 1004 out_gunlock_q: 1005 if (da.nr_blocks) 1006 gfs2_quota_unlock(dip); 1007 out_gunlock: 1008 gfs2_dir_no_add(&da); 1009 gfs2_glock_dq(ghs + 1); 1010 out_child: 1011 gfs2_glock_dq(ghs); 1012 out_parent: 1013 gfs2_holder_uninit(ghs); 1014 gfs2_holder_uninit(ghs + 1); 1015 return error; 1016 } 1017 1018 /* 1019 * gfs2_unlink_ok - check to see that a inode is still in a directory 1020 * @dip: the directory 1021 * @name: the name of the file 1022 * @ip: the inode 1023 * 1024 * Assumes that the lock on (at least) @dip is held. 1025 * 1026 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1027 */ 1028 1029 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1030 const struct gfs2_inode *ip) 1031 { 1032 int error; 1033 1034 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1035 return -EPERM; 1036 1037 if ((dip->i_inode.i_mode & S_ISVTX) && 1038 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1039 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1040 return -EPERM; 1041 1042 if (IS_APPEND(&dip->i_inode)) 1043 return -EPERM; 1044 1045 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1046 if (error) 1047 return error; 1048 1049 error = gfs2_dir_check(&dip->i_inode, name, ip); 1050 if (error) 1051 return error; 1052 1053 return 0; 1054 } 1055 1056 /** 1057 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1058 * @dip: The parent directory 1059 * @name: The name of the entry in the parent directory 1060 * @inode: The inode to be removed 1061 * 1062 * Called with all the locks and in a transaction. This will only be 1063 * called for a directory after it has been checked to ensure it is empty. 1064 * 1065 * Returns: 0 on success, or an error 1066 */ 1067 1068 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1069 const struct dentry *dentry) 1070 { 1071 struct inode *inode = dentry->d_inode; 1072 struct gfs2_inode *ip = GFS2_I(inode); 1073 int error; 1074 1075 error = gfs2_dir_del(dip, dentry); 1076 if (error) 1077 return error; 1078 1079 ip->i_entries = 0; 1080 inode->i_ctime = CURRENT_TIME; 1081 if (S_ISDIR(inode->i_mode)) 1082 clear_nlink(inode); 1083 else 1084 drop_nlink(inode); 1085 mark_inode_dirty(inode); 1086 if (inode->i_nlink == 0) 1087 gfs2_unlink_di(inode); 1088 return 0; 1089 } 1090 1091 1092 /** 1093 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1094 * @dir: The inode of the directory containing the inode to unlink 1095 * @dentry: The file itself 1096 * 1097 * This routine uses the type of the inode as a flag to figure out 1098 * whether this is an unlink or an rmdir. 1099 * 1100 * Returns: errno 1101 */ 1102 1103 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1104 { 1105 struct gfs2_inode *dip = GFS2_I(dir); 1106 struct gfs2_sbd *sdp = GFS2_SB(dir); 1107 struct inode *inode = dentry->d_inode; 1108 struct gfs2_inode *ip = GFS2_I(inode); 1109 struct gfs2_holder ghs[3]; 1110 struct gfs2_rgrpd *rgd; 1111 int error; 1112 1113 error = gfs2_rindex_update(sdp); 1114 if (error) 1115 return error; 1116 1117 error = -EROFS; 1118 1119 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1120 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1121 1122 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1123 if (!rgd) 1124 goto out_inodes; 1125 1126 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1127 1128 1129 error = gfs2_glock_nq(ghs); /* parent */ 1130 if (error) 1131 goto out_parent; 1132 1133 error = gfs2_glock_nq(ghs + 1); /* child */ 1134 if (error) 1135 goto out_child; 1136 1137 error = -ENOENT; 1138 if (inode->i_nlink == 0) 1139 goto out_rgrp; 1140 1141 if (S_ISDIR(inode->i_mode)) { 1142 error = -ENOTEMPTY; 1143 if (ip->i_entries > 2 || inode->i_nlink > 2) 1144 goto out_rgrp; 1145 } 1146 1147 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1148 if (error) 1149 goto out_rgrp; 1150 1151 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1152 if (error) 1153 goto out_gunlock; 1154 1155 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1156 if (error) 1157 goto out_end_trans; 1158 1159 error = gfs2_unlink_inode(dip, dentry); 1160 1161 out_end_trans: 1162 gfs2_trans_end(sdp); 1163 out_gunlock: 1164 gfs2_glock_dq(ghs + 2); 1165 out_rgrp: 1166 gfs2_glock_dq(ghs + 1); 1167 out_child: 1168 gfs2_glock_dq(ghs); 1169 out_parent: 1170 gfs2_holder_uninit(ghs + 2); 1171 out_inodes: 1172 gfs2_holder_uninit(ghs + 1); 1173 gfs2_holder_uninit(ghs); 1174 return error; 1175 } 1176 1177 /** 1178 * gfs2_symlink - Create a symlink 1179 * @dir: The directory to create the symlink in 1180 * @dentry: The dentry to put the symlink in 1181 * @symname: The thing which the link points to 1182 * 1183 * Returns: errno 1184 */ 1185 1186 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1187 const char *symname) 1188 { 1189 struct gfs2_sbd *sdp = GFS2_SB(dir); 1190 unsigned int size; 1191 1192 size = strlen(symname); 1193 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1194 return -ENAMETOOLONG; 1195 1196 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1197 } 1198 1199 /** 1200 * gfs2_mkdir - Make a directory 1201 * @dir: The parent directory of the new one 1202 * @dentry: The dentry of the new directory 1203 * @mode: The mode of the new directory 1204 * 1205 * Returns: errno 1206 */ 1207 1208 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1209 { 1210 struct gfs2_sbd *sdp = GFS2_SB(dir); 1211 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1212 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1213 } 1214 1215 /** 1216 * gfs2_mknod - Make a special file 1217 * @dir: The directory in which the special file will reside 1218 * @dentry: The dentry of the special file 1219 * @mode: The mode of the special file 1220 * @dev: The device specification of the special file 1221 * 1222 */ 1223 1224 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1225 dev_t dev) 1226 { 1227 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1228 } 1229 1230 /** 1231 * gfs2_atomic_open - Atomically open a file 1232 * @dir: The directory 1233 * @dentry: The proposed new entry 1234 * @file: The proposed new struct file 1235 * @flags: open flags 1236 * @mode: File mode 1237 * @opened: Flag to say whether the file has been opened or not 1238 * 1239 * Returns: error code or 0 for success 1240 */ 1241 1242 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1243 struct file *file, unsigned flags, 1244 umode_t mode, int *opened) 1245 { 1246 struct dentry *d; 1247 bool excl = !!(flags & O_EXCL); 1248 1249 d = __gfs2_lookup(dir, dentry, file, opened); 1250 if (IS_ERR(d)) 1251 return PTR_ERR(d); 1252 if (d != NULL) 1253 dentry = d; 1254 if (dentry->d_inode) { 1255 if (!(*opened & FILE_OPENED)) { 1256 if (d == NULL) 1257 dget(dentry); 1258 return finish_no_open(file, dentry); 1259 } 1260 dput(d); 1261 return 0; 1262 } 1263 1264 BUG_ON(d != NULL); 1265 if (!(flags & O_CREAT)) 1266 return -ENOENT; 1267 1268 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1269 } 1270 1271 /* 1272 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1273 * @this: move this 1274 * @to: to here 1275 * 1276 * Follow @to back to the root and make sure we don't encounter @this 1277 * Assumes we already hold the rename lock. 1278 * 1279 * Returns: errno 1280 */ 1281 1282 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1283 { 1284 struct inode *dir = &to->i_inode; 1285 struct super_block *sb = dir->i_sb; 1286 struct inode *tmp; 1287 int error = 0; 1288 1289 igrab(dir); 1290 1291 for (;;) { 1292 if (dir == &this->i_inode) { 1293 error = -EINVAL; 1294 break; 1295 } 1296 if (dir == sb->s_root->d_inode) { 1297 error = 0; 1298 break; 1299 } 1300 1301 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1302 if (IS_ERR(tmp)) { 1303 error = PTR_ERR(tmp); 1304 break; 1305 } 1306 1307 iput(dir); 1308 dir = tmp; 1309 } 1310 1311 iput(dir); 1312 1313 return error; 1314 } 1315 1316 /** 1317 * gfs2_rename - Rename a file 1318 * @odir: Parent directory of old file name 1319 * @odentry: The old dentry of the file 1320 * @ndir: Parent directory of new file name 1321 * @ndentry: The new dentry of the file 1322 * 1323 * Returns: errno 1324 */ 1325 1326 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1327 struct inode *ndir, struct dentry *ndentry) 1328 { 1329 struct gfs2_inode *odip = GFS2_I(odir); 1330 struct gfs2_inode *ndip = GFS2_I(ndir); 1331 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1332 struct gfs2_inode *nip = NULL; 1333 struct gfs2_sbd *sdp = GFS2_SB(odir); 1334 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1335 struct gfs2_rgrpd *nrgd; 1336 unsigned int num_gh; 1337 int dir_rename = 0; 1338 struct gfs2_diradd da = { .nr_blocks = 0, }; 1339 unsigned int x; 1340 int error; 1341 1342 if (ndentry->d_inode) { 1343 nip = GFS2_I(ndentry->d_inode); 1344 if (ip == nip) 1345 return 0; 1346 } 1347 1348 error = gfs2_rindex_update(sdp); 1349 if (error) 1350 return error; 1351 1352 error = gfs2_rs_alloc(ndip); 1353 if (error) 1354 return error; 1355 1356 if (odip != ndip) { 1357 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1358 0, &r_gh); 1359 if (error) 1360 goto out; 1361 1362 if (S_ISDIR(ip->i_inode.i_mode)) { 1363 dir_rename = 1; 1364 /* don't move a dirctory into it's subdir */ 1365 error = gfs2_ok_to_move(ip, ndip); 1366 if (error) 1367 goto out_gunlock_r; 1368 } 1369 } 1370 1371 num_gh = 1; 1372 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1373 if (odip != ndip) { 1374 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1375 num_gh++; 1376 } 1377 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1378 num_gh++; 1379 1380 if (nip) { 1381 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1382 num_gh++; 1383 /* grab the resource lock for unlink flag twiddling 1384 * this is the case of the target file already existing 1385 * so we unlink before doing the rename 1386 */ 1387 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1388 if (nrgd) 1389 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1390 } 1391 1392 for (x = 0; x < num_gh; x++) { 1393 error = gfs2_glock_nq(ghs + x); 1394 if (error) 1395 goto out_gunlock; 1396 } 1397 1398 error = -ENOENT; 1399 if (ip->i_inode.i_nlink == 0) 1400 goto out_gunlock; 1401 1402 /* Check out the old directory */ 1403 1404 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1405 if (error) 1406 goto out_gunlock; 1407 1408 /* Check out the new directory */ 1409 1410 if (nip) { 1411 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1412 if (error) 1413 goto out_gunlock; 1414 1415 if (nip->i_inode.i_nlink == 0) { 1416 error = -EAGAIN; 1417 goto out_gunlock; 1418 } 1419 1420 if (S_ISDIR(nip->i_inode.i_mode)) { 1421 if (nip->i_entries < 2) { 1422 gfs2_consist_inode(nip); 1423 error = -EIO; 1424 goto out_gunlock; 1425 } 1426 if (nip->i_entries > 2) { 1427 error = -ENOTEMPTY; 1428 goto out_gunlock; 1429 } 1430 } 1431 } else { 1432 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1433 if (error) 1434 goto out_gunlock; 1435 1436 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1437 switch (error) { 1438 case -ENOENT: 1439 error = 0; 1440 break; 1441 case 0: 1442 error = -EEXIST; 1443 default: 1444 goto out_gunlock; 1445 }; 1446 1447 if (odip != ndip) { 1448 if (!ndip->i_inode.i_nlink) { 1449 error = -ENOENT; 1450 goto out_gunlock; 1451 } 1452 if (ndip->i_entries == (u32)-1) { 1453 error = -EFBIG; 1454 goto out_gunlock; 1455 } 1456 if (S_ISDIR(ip->i_inode.i_mode) && 1457 ndip->i_inode.i_nlink == (u32)-1) { 1458 error = -EMLINK; 1459 goto out_gunlock; 1460 } 1461 } 1462 } 1463 1464 /* Check out the dir to be renamed */ 1465 1466 if (dir_rename) { 1467 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1468 if (error) 1469 goto out_gunlock; 1470 } 1471 1472 if (nip == NULL) { 1473 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1474 if (error) 1475 goto out_gunlock; 1476 } 1477 1478 if (da.nr_blocks) { 1479 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1480 error = gfs2_quota_lock_check(ndip); 1481 if (error) 1482 goto out_gunlock; 1483 1484 error = gfs2_inplace_reserve(ndip, &ap); 1485 if (error) 1486 goto out_gunlock_q; 1487 1488 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1489 4 * RES_LEAF + 4, 0); 1490 if (error) 1491 goto out_ipreserv; 1492 } else { 1493 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1494 5 * RES_LEAF + 4, 0); 1495 if (error) 1496 goto out_gunlock; 1497 } 1498 1499 /* Remove the target file, if it exists */ 1500 1501 if (nip) 1502 error = gfs2_unlink_inode(ndip, ndentry); 1503 1504 if (dir_rename) { 1505 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1506 if (error) 1507 goto out_end_trans; 1508 } else { 1509 struct buffer_head *dibh; 1510 error = gfs2_meta_inode_buffer(ip, &dibh); 1511 if (error) 1512 goto out_end_trans; 1513 ip->i_inode.i_ctime = CURRENT_TIME; 1514 gfs2_trans_add_meta(ip->i_gl, dibh); 1515 gfs2_dinode_out(ip, dibh->b_data); 1516 brelse(dibh); 1517 } 1518 1519 error = gfs2_dir_del(odip, odentry); 1520 if (error) 1521 goto out_end_trans; 1522 1523 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1524 if (error) 1525 goto out_end_trans; 1526 1527 out_end_trans: 1528 gfs2_trans_end(sdp); 1529 out_ipreserv: 1530 if (da.nr_blocks) 1531 gfs2_inplace_release(ndip); 1532 out_gunlock_q: 1533 if (da.nr_blocks) 1534 gfs2_quota_unlock(ndip); 1535 out_gunlock: 1536 gfs2_dir_no_add(&da); 1537 while (x--) { 1538 gfs2_glock_dq(ghs + x); 1539 gfs2_holder_uninit(ghs + x); 1540 } 1541 out_gunlock_r: 1542 if (r_gh.gh_gl) 1543 gfs2_glock_dq_uninit(&r_gh); 1544 out: 1545 return error; 1546 } 1547 1548 /** 1549 * gfs2_follow_link - Follow a symbolic link 1550 * @dentry: The dentry of the link 1551 * @nd: Data that we pass to vfs_follow_link() 1552 * 1553 * This can handle symlinks of any size. 1554 * 1555 * Returns: 0 on success or error code 1556 */ 1557 1558 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1559 { 1560 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1561 struct gfs2_holder i_gh; 1562 struct buffer_head *dibh; 1563 unsigned int size; 1564 char *buf; 1565 int error; 1566 1567 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1568 error = gfs2_glock_nq(&i_gh); 1569 if (error) { 1570 gfs2_holder_uninit(&i_gh); 1571 nd_set_link(nd, ERR_PTR(error)); 1572 return NULL; 1573 } 1574 1575 size = (unsigned int)i_size_read(&ip->i_inode); 1576 if (size == 0) { 1577 gfs2_consist_inode(ip); 1578 buf = ERR_PTR(-EIO); 1579 goto out; 1580 } 1581 1582 error = gfs2_meta_inode_buffer(ip, &dibh); 1583 if (error) { 1584 buf = ERR_PTR(error); 1585 goto out; 1586 } 1587 1588 buf = kzalloc(size + 1, GFP_NOFS); 1589 if (!buf) 1590 buf = ERR_PTR(-ENOMEM); 1591 else 1592 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1593 brelse(dibh); 1594 out: 1595 gfs2_glock_dq_uninit(&i_gh); 1596 nd_set_link(nd, buf); 1597 return NULL; 1598 } 1599 1600 /** 1601 * gfs2_permission - 1602 * @inode: The inode 1603 * @mask: The mask to be tested 1604 * @flags: Indicates whether this is an RCU path walk or not 1605 * 1606 * This may be called from the VFS directly, or from within GFS2 with the 1607 * inode locked, so we look to see if the glock is already locked and only 1608 * lock the glock if its not already been done. 1609 * 1610 * Returns: errno 1611 */ 1612 1613 int gfs2_permission(struct inode *inode, int mask) 1614 { 1615 struct gfs2_inode *ip; 1616 struct gfs2_holder i_gh; 1617 int error; 1618 int unlock = 0; 1619 1620 1621 ip = GFS2_I(inode); 1622 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1623 if (mask & MAY_NOT_BLOCK) 1624 return -ECHILD; 1625 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1626 if (error) 1627 return error; 1628 unlock = 1; 1629 } 1630 1631 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1632 error = -EACCES; 1633 else 1634 error = generic_permission(inode, mask); 1635 if (unlock) 1636 gfs2_glock_dq_uninit(&i_gh); 1637 1638 return error; 1639 } 1640 1641 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1642 { 1643 setattr_copy(inode, attr); 1644 mark_inode_dirty(inode); 1645 return 0; 1646 } 1647 1648 /** 1649 * gfs2_setattr_simple - 1650 * @ip: 1651 * @attr: 1652 * 1653 * Returns: errno 1654 */ 1655 1656 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1657 { 1658 int error; 1659 1660 if (current->journal_info) 1661 return __gfs2_setattr_simple(inode, attr); 1662 1663 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1664 if (error) 1665 return error; 1666 1667 error = __gfs2_setattr_simple(inode, attr); 1668 gfs2_trans_end(GFS2_SB(inode)); 1669 return error; 1670 } 1671 1672 static int setattr_chown(struct inode *inode, struct iattr *attr) 1673 { 1674 struct gfs2_inode *ip = GFS2_I(inode); 1675 struct gfs2_sbd *sdp = GFS2_SB(inode); 1676 kuid_t ouid, nuid; 1677 kgid_t ogid, ngid; 1678 int error; 1679 1680 ouid = inode->i_uid; 1681 ogid = inode->i_gid; 1682 nuid = attr->ia_uid; 1683 ngid = attr->ia_gid; 1684 1685 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1686 ouid = nuid = NO_UID_QUOTA_CHANGE; 1687 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1688 ogid = ngid = NO_GID_QUOTA_CHANGE; 1689 1690 error = get_write_access(inode); 1691 if (error) 1692 return error; 1693 1694 error = gfs2_rs_alloc(ip); 1695 if (error) 1696 goto out; 1697 1698 error = gfs2_rindex_update(sdp); 1699 if (error) 1700 goto out; 1701 1702 error = gfs2_quota_lock(ip, nuid, ngid); 1703 if (error) 1704 goto out; 1705 1706 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1707 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1708 error = gfs2_quota_check(ip, nuid, ngid); 1709 if (error) 1710 goto out_gunlock_q; 1711 } 1712 1713 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1714 if (error) 1715 goto out_gunlock_q; 1716 1717 error = gfs2_setattr_simple(inode, attr); 1718 if (error) 1719 goto out_end_trans; 1720 1721 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1722 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1723 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1724 gfs2_quota_change(ip, -blocks, ouid, ogid); 1725 gfs2_quota_change(ip, blocks, nuid, ngid); 1726 } 1727 1728 out_end_trans: 1729 gfs2_trans_end(sdp); 1730 out_gunlock_q: 1731 gfs2_quota_unlock(ip); 1732 out: 1733 put_write_access(inode); 1734 return error; 1735 } 1736 1737 /** 1738 * gfs2_setattr - Change attributes on an inode 1739 * @dentry: The dentry which is changing 1740 * @attr: The structure describing the change 1741 * 1742 * The VFS layer wants to change one or more of an inodes attributes. Write 1743 * that change out to disk. 1744 * 1745 * Returns: errno 1746 */ 1747 1748 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1749 { 1750 struct inode *inode = dentry->d_inode; 1751 struct gfs2_inode *ip = GFS2_I(inode); 1752 struct gfs2_holder i_gh; 1753 int error; 1754 1755 error = gfs2_rs_alloc(ip); 1756 if (error) 1757 return error; 1758 1759 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1760 if (error) 1761 return error; 1762 1763 error = -EPERM; 1764 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1765 goto out; 1766 1767 error = inode_change_ok(inode, attr); 1768 if (error) 1769 goto out; 1770 1771 if (attr->ia_valid & ATTR_SIZE) 1772 error = gfs2_setattr_size(inode, attr->ia_size); 1773 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1774 error = setattr_chown(inode, attr); 1775 else { 1776 error = gfs2_setattr_simple(inode, attr); 1777 if (!error && attr->ia_valid & ATTR_MODE) 1778 error = posix_acl_chmod(inode, inode->i_mode); 1779 } 1780 1781 out: 1782 if (!error) 1783 mark_inode_dirty(inode); 1784 gfs2_glock_dq_uninit(&i_gh); 1785 return error; 1786 } 1787 1788 /** 1789 * gfs2_getattr - Read out an inode's attributes 1790 * @mnt: The vfsmount the inode is being accessed from 1791 * @dentry: The dentry to stat 1792 * @stat: The inode's stats 1793 * 1794 * This may be called from the VFS directly, or from within GFS2 with the 1795 * inode locked, so we look to see if the glock is already locked and only 1796 * lock the glock if its not already been done. Note that its the NFS 1797 * readdirplus operation which causes this to be called (from filldir) 1798 * with the glock already held. 1799 * 1800 * Returns: errno 1801 */ 1802 1803 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1804 struct kstat *stat) 1805 { 1806 struct inode *inode = dentry->d_inode; 1807 struct gfs2_inode *ip = GFS2_I(inode); 1808 struct gfs2_holder gh; 1809 int error; 1810 int unlock = 0; 1811 1812 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1813 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1814 if (error) 1815 return error; 1816 unlock = 1; 1817 } 1818 1819 generic_fillattr(inode, stat); 1820 if (unlock) 1821 gfs2_glock_dq_uninit(&gh); 1822 1823 return 0; 1824 } 1825 1826 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1827 const void *data, size_t size, int flags) 1828 { 1829 struct inode *inode = dentry->d_inode; 1830 struct gfs2_inode *ip = GFS2_I(inode); 1831 struct gfs2_holder gh; 1832 int ret; 1833 1834 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1835 ret = gfs2_glock_nq(&gh); 1836 if (ret == 0) { 1837 ret = gfs2_rs_alloc(ip); 1838 if (ret == 0) 1839 ret = generic_setxattr(dentry, name, data, size, flags); 1840 gfs2_glock_dq(&gh); 1841 } 1842 gfs2_holder_uninit(&gh); 1843 return ret; 1844 } 1845 1846 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1847 void *data, size_t size) 1848 { 1849 struct inode *inode = dentry->d_inode; 1850 struct gfs2_inode *ip = GFS2_I(inode); 1851 struct gfs2_holder gh; 1852 int ret; 1853 1854 /* For selinux during lookup */ 1855 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1856 return generic_getxattr(dentry, name, data, size); 1857 1858 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1859 ret = gfs2_glock_nq(&gh); 1860 if (ret == 0) { 1861 ret = generic_getxattr(dentry, name, data, size); 1862 gfs2_glock_dq(&gh); 1863 } 1864 gfs2_holder_uninit(&gh); 1865 return ret; 1866 } 1867 1868 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1869 { 1870 struct inode *inode = dentry->d_inode; 1871 struct gfs2_inode *ip = GFS2_I(inode); 1872 struct gfs2_holder gh; 1873 int ret; 1874 1875 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1876 ret = gfs2_glock_nq(&gh); 1877 if (ret == 0) { 1878 ret = gfs2_rs_alloc(ip); 1879 if (ret == 0) 1880 ret = generic_removexattr(dentry, name); 1881 gfs2_glock_dq(&gh); 1882 } 1883 gfs2_holder_uninit(&gh); 1884 return ret; 1885 } 1886 1887 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1888 u64 start, u64 len) 1889 { 1890 struct gfs2_inode *ip = GFS2_I(inode); 1891 struct gfs2_holder gh; 1892 int ret; 1893 1894 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1895 if (ret) 1896 return ret; 1897 1898 mutex_lock(&inode->i_mutex); 1899 1900 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1901 if (ret) 1902 goto out; 1903 1904 if (gfs2_is_stuffed(ip)) { 1905 u64 phys = ip->i_no_addr << inode->i_blkbits; 1906 u64 size = i_size_read(inode); 1907 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1908 FIEMAP_EXTENT_DATA_INLINE; 1909 phys += sizeof(struct gfs2_dinode); 1910 phys += start; 1911 if (start + len > size) 1912 len = size - start; 1913 if (start < size) 1914 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1915 len, flags); 1916 if (ret == 1) 1917 ret = 0; 1918 } else { 1919 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1920 gfs2_block_map); 1921 } 1922 1923 gfs2_glock_dq_uninit(&gh); 1924 out: 1925 mutex_unlock(&inode->i_mutex); 1926 return ret; 1927 } 1928 1929 const struct inode_operations gfs2_file_iops = { 1930 .permission = gfs2_permission, 1931 .setattr = gfs2_setattr, 1932 .getattr = gfs2_getattr, 1933 .setxattr = gfs2_setxattr, 1934 .getxattr = gfs2_getxattr, 1935 .listxattr = gfs2_listxattr, 1936 .removexattr = gfs2_removexattr, 1937 .fiemap = gfs2_fiemap, 1938 .get_acl = gfs2_get_acl, 1939 .set_acl = gfs2_set_acl, 1940 }; 1941 1942 const struct inode_operations gfs2_dir_iops = { 1943 .create = gfs2_create, 1944 .lookup = gfs2_lookup, 1945 .link = gfs2_link, 1946 .unlink = gfs2_unlink, 1947 .symlink = gfs2_symlink, 1948 .mkdir = gfs2_mkdir, 1949 .rmdir = gfs2_unlink, 1950 .mknod = gfs2_mknod, 1951 .rename = gfs2_rename, 1952 .permission = gfs2_permission, 1953 .setattr = gfs2_setattr, 1954 .getattr = gfs2_getattr, 1955 .setxattr = gfs2_setxattr, 1956 .getxattr = gfs2_getxattr, 1957 .listxattr = gfs2_listxattr, 1958 .removexattr = gfs2_removexattr, 1959 .fiemap = gfs2_fiemap, 1960 .get_acl = gfs2_get_acl, 1961 .set_acl = gfs2_set_acl, 1962 .atomic_open = gfs2_atomic_open, 1963 }; 1964 1965 const struct inode_operations gfs2_symlink_iops = { 1966 .readlink = generic_readlink, 1967 .follow_link = gfs2_follow_link, 1968 .put_link = kfree_put_link, 1969 .permission = gfs2_permission, 1970 .setattr = gfs2_setattr, 1971 .getattr = gfs2_getattr, 1972 .setxattr = gfs2_setxattr, 1973 .getxattr = gfs2_getxattr, 1974 .listxattr = gfs2_listxattr, 1975 .removexattr = gfs2_removexattr, 1976 .fiemap = gfs2_fiemap, 1977 }; 1978 1979