1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 5 */ 6 7 #include <linux/slab.h> 8 #include <linux/spinlock.h> 9 #include <linux/completion.h> 10 #include <linux/buffer_head.h> 11 #include <linux/namei.h> 12 #include <linux/mm.h> 13 #include <linux/cred.h> 14 #include <linux/xattr.h> 15 #include <linux/posix_acl.h> 16 #include <linux/gfs2_ondisk.h> 17 #include <linux/crc32.h> 18 #include <linux/iomap.h> 19 #include <linux/security.h> 20 #include <linux/fiemap.h> 21 #include <linux/uaccess.h> 22 23 #include "gfs2.h" 24 #include "incore.h" 25 #include "acl.h" 26 #include "bmap.h" 27 #include "dir.h" 28 #include "xattr.h" 29 #include "glock.h" 30 #include "inode.h" 31 #include "meta_io.h" 32 #include "quota.h" 33 #include "rgrp.h" 34 #include "trans.h" 35 #include "util.h" 36 #include "super.h" 37 #include "glops.h" 38 39 static const struct inode_operations gfs2_file_iops; 40 static const struct inode_operations gfs2_dir_iops; 41 static const struct inode_operations gfs2_symlink_iops; 42 43 /** 44 * gfs2_set_iop - Sets inode operations 45 * @inode: The inode with correct i_mode filled in 46 * 47 * GFS2 lookup code fills in vfs inode contents based on info obtained 48 * from directory entry inside gfs2_inode_lookup(). 49 */ 50 51 static void gfs2_set_iop(struct inode *inode) 52 { 53 struct gfs2_sbd *sdp = GFS2_SB(inode); 54 umode_t mode = inode->i_mode; 55 56 if (S_ISREG(mode)) { 57 inode->i_op = &gfs2_file_iops; 58 if (gfs2_localflocks(sdp)) 59 inode->i_fop = &gfs2_file_fops_nolock; 60 else 61 inode->i_fop = &gfs2_file_fops; 62 } else if (S_ISDIR(mode)) { 63 inode->i_op = &gfs2_dir_iops; 64 if (gfs2_localflocks(sdp)) 65 inode->i_fop = &gfs2_dir_fops_nolock; 66 else 67 inode->i_fop = &gfs2_dir_fops; 68 } else if (S_ISLNK(mode)) { 69 inode->i_op = &gfs2_symlink_iops; 70 } else { 71 inode->i_op = &gfs2_file_iops; 72 init_special_inode(inode, inode->i_mode, inode->i_rdev); 73 } 74 } 75 76 static int iget_test(struct inode *inode, void *opaque) 77 { 78 u64 no_addr = *(u64 *)opaque; 79 80 return GFS2_I(inode)->i_no_addr == no_addr; 81 } 82 83 static int iget_set(struct inode *inode, void *opaque) 84 { 85 u64 no_addr = *(u64 *)opaque; 86 87 GFS2_I(inode)->i_no_addr = no_addr; 88 inode->i_ino = no_addr; 89 return 0; 90 } 91 92 /** 93 * gfs2_inode_lookup - Lookup an inode 94 * @sb: The super block 95 * @type: The type of the inode 96 * @no_addr: The inode number 97 * @no_formal_ino: The inode generation number 98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 99 * GFS2_BLKST_FREE to indicate not to verify) 100 * 101 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 102 * 103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 104 * placeholder because it doesn't otherwise make sense), the on-disk block type 105 * is verified to be @blktype. 106 * 107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 108 * if it detects that @no_formal_ino doesn't match the actual inode generation 109 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 110 * 111 * Returns: A VFS inode, or an error 112 */ 113 114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 115 u64 no_addr, u64 no_formal_ino, 116 unsigned int blktype) 117 { 118 struct inode *inode; 119 struct gfs2_inode *ip; 120 struct gfs2_holder i_gh; 121 int error; 122 123 gfs2_holder_mark_uninitialized(&i_gh); 124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 125 if (!inode) 126 return ERR_PTR(-ENOMEM); 127 128 ip = GFS2_I(inode); 129 130 if (inode->i_state & I_NEW) { 131 struct gfs2_sbd *sdp = GFS2_SB(inode); 132 struct gfs2_glock *io_gl; 133 int extra_flags = 0; 134 135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, 136 &ip->i_gl); 137 if (unlikely(error)) 138 goto fail; 139 140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, 141 &io_gl); 142 if (unlikely(error)) 143 goto fail; 144 145 /* 146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is 147 * delete_work_func(). Make sure not to cancel the delete work 148 * from within itself here. 149 */ 150 if (blktype == GFS2_BLKST_UNLINKED) 151 extra_flags |= LM_FLAG_TRY; 152 else 153 gfs2_cancel_delete_work(io_gl); 154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, 155 GL_EXACT | GL_NOPID | extra_flags, 156 &ip->i_iopen_gh); 157 gfs2_glock_put(io_gl); 158 if (unlikely(error)) 159 goto fail; 160 161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 162 /* 163 * The GL_SKIP flag indicates to skip reading the inode 164 * block. We read the inode when instantiating it 165 * after possibly checking the block type. 166 */ 167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 168 GL_SKIP, &i_gh); 169 if (error) 170 goto fail; 171 172 error = -ESTALE; 173 if (no_formal_ino && 174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 175 goto fail; 176 177 if (blktype != GFS2_BLKST_FREE) { 178 error = gfs2_check_blk_type(sdp, no_addr, 179 blktype); 180 if (error) 181 goto fail; 182 } 183 } 184 185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); 186 187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 188 inode_set_atime(inode, 189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1), 190 0); 191 192 glock_set_object(ip->i_gl, ip); 193 194 if (type == DT_UNKNOWN) { 195 /* Inode glock must be locked already */ 196 error = gfs2_instantiate(&i_gh); 197 if (error) { 198 glock_clear_object(ip->i_gl, ip); 199 goto fail; 200 } 201 } else { 202 ip->i_no_formal_ino = no_formal_ino; 203 inode->i_mode = DT2IF(type); 204 } 205 206 if (gfs2_holder_initialized(&i_gh)) 207 gfs2_glock_dq_uninit(&i_gh); 208 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 209 210 gfs2_set_iop(inode); 211 unlock_new_inode(inode); 212 } 213 214 if (no_formal_ino && ip->i_no_formal_ino && 215 no_formal_ino != ip->i_no_formal_ino) { 216 iput(inode); 217 return ERR_PTR(-ESTALE); 218 } 219 220 return inode; 221 222 fail: 223 if (error == GLR_TRYFAILED) 224 error = -EAGAIN; 225 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 226 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 227 if (gfs2_holder_initialized(&i_gh)) 228 gfs2_glock_dq_uninit(&i_gh); 229 if (ip->i_gl) { 230 gfs2_glock_put(ip->i_gl); 231 ip->i_gl = NULL; 232 } 233 iget_failed(inode); 234 return ERR_PTR(error); 235 } 236 237 /** 238 * gfs2_lookup_by_inum - look up an inode by inode number 239 * @sdp: The super block 240 * @no_addr: The inode number 241 * @no_formal_ino: The inode generation number (0 for any) 242 * @blktype: Requested block type (see gfs2_inode_lookup) 243 */ 244 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 245 u64 no_formal_ino, unsigned int blktype) 246 { 247 struct super_block *sb = sdp->sd_vfs; 248 struct inode *inode; 249 int error; 250 251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 252 blktype); 253 if (IS_ERR(inode)) 254 return inode; 255 256 if (no_formal_ino) { 257 error = -EIO; 258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 259 goto fail_iput; 260 } 261 return inode; 262 263 fail_iput: 264 iput(inode); 265 return ERR_PTR(error); 266 } 267 268 269 /** 270 * gfs2_lookup_meta - Look up an inode in a metadata directory 271 * @dip: The directory 272 * @name: The name of the inode 273 */ 274 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name) 275 { 276 struct qstr qstr; 277 struct inode *inode; 278 279 gfs2_str2qstr(&qstr, name); 280 inode = gfs2_lookupi(dip, &qstr, 1); 281 if (IS_ERR_OR_NULL(inode)) 282 return inode ? inode : ERR_PTR(-ENOENT); 283 284 /* 285 * Must not call back into the filesystem when allocating 286 * pages in the metadata inode's address space. 287 */ 288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 289 290 return inode; 291 } 292 293 294 /** 295 * gfs2_lookupi - Look up a filename in a directory and return its inode 296 * @dir: The inode of the directory containing the inode to look-up 297 * @name: The name of the inode to look for 298 * @is_root: If 1, ignore the caller's permissions 299 * 300 * This can be called via the VFS filldir function when NFS is doing 301 * a readdirplus and the inode which its intending to stat isn't 302 * already in cache. In this case we must not take the directory glock 303 * again, since the readdir call will have already taken that lock. 304 * 305 * Returns: errno 306 */ 307 308 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 309 int is_root) 310 { 311 struct super_block *sb = dir->i_sb; 312 struct gfs2_inode *dip = GFS2_I(dir); 313 struct gfs2_holder d_gh; 314 int error = 0; 315 struct inode *inode = NULL; 316 317 gfs2_holder_mark_uninitialized(&d_gh); 318 if (!name->len || name->len > GFS2_FNAMESIZE) 319 return ERR_PTR(-ENAMETOOLONG); 320 321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 323 dir == d_inode(sb->s_root))) { 324 igrab(dir); 325 return dir; 326 } 327 328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 330 if (error) 331 return ERR_PTR(error); 332 } 333 334 if (!is_root) { 335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 336 if (error) 337 goto out; 338 } 339 340 inode = gfs2_dir_search(dir, name, false); 341 if (IS_ERR(inode)) 342 error = PTR_ERR(inode); 343 out: 344 if (gfs2_holder_initialized(&d_gh)) 345 gfs2_glock_dq_uninit(&d_gh); 346 if (error == -ENOENT) 347 return NULL; 348 return inode ? inode : ERR_PTR(error); 349 } 350 351 /** 352 * create_ok - OK to create a new on-disk inode here? 353 * @dip: Directory in which dinode is to be created 354 * @name: Name of new dinode 355 * @mode: 356 * 357 * Returns: errno 358 */ 359 360 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 361 umode_t mode) 362 { 363 int error; 364 365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 366 MAY_WRITE | MAY_EXEC); 367 if (error) 368 return error; 369 370 /* Don't create entries in an unlinked directory */ 371 if (!dip->i_inode.i_nlink) 372 return -ENOENT; 373 374 if (dip->i_entries == (u32)-1) 375 return -EFBIG; 376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 377 return -EMLINK; 378 379 return 0; 380 } 381 382 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 383 struct inode *inode) 384 { 385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 386 (dip->i_inode.i_mode & S_ISUID) && 387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 388 if (S_ISDIR(inode->i_mode)) 389 inode->i_mode |= S_ISUID; 390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 391 inode->i_mode &= ~07111; 392 inode->i_uid = dip->i_inode.i_uid; 393 } else 394 inode->i_uid = current_fsuid(); 395 396 if (dip->i_inode.i_mode & S_ISGID) { 397 if (S_ISDIR(inode->i_mode)) 398 inode->i_mode |= S_ISGID; 399 inode->i_gid = dip->i_inode.i_gid; 400 } else 401 inode->i_gid = current_fsgid(); 402 } 403 404 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 405 { 406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 408 int error; 409 410 error = gfs2_quota_lock_check(ip, &ap); 411 if (error) 412 goto out; 413 414 error = gfs2_inplace_reserve(ip, &ap); 415 if (error) 416 goto out_quota; 417 418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 419 if (error) 420 goto out_ipreserv; 421 422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1); 423 if (error) 424 goto out_trans_end; 425 426 ip->i_no_formal_ino = ip->i_generation; 427 ip->i_inode.i_ino = ip->i_no_addr; 428 ip->i_goal = ip->i_no_addr; 429 if (*dblocks > 1) 430 ip->i_eattr = ip->i_no_addr + 1; 431 432 out_trans_end: 433 gfs2_trans_end(sdp); 434 out_ipreserv: 435 gfs2_inplace_release(ip); 436 out_quota: 437 gfs2_quota_unlock(ip); 438 out: 439 return error; 440 } 441 442 static void gfs2_init_dir(struct buffer_head *dibh, 443 const struct gfs2_inode *parent) 444 { 445 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 446 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 447 448 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 449 dent->de_inum = di->di_num; /* already GFS2 endian */ 450 dent->de_type = cpu_to_be16(DT_DIR); 451 452 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 453 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 454 gfs2_inum_out(parent, dent); 455 dent->de_type = cpu_to_be16(DT_DIR); 456 457 } 458 459 /** 460 * gfs2_init_xattr - Initialise an xattr block for a new inode 461 * @ip: The inode in question 462 * 463 * This sets up an empty xattr block for a new inode, ready to 464 * take any ACLs, LSM xattrs, etc. 465 */ 466 467 static void gfs2_init_xattr(struct gfs2_inode *ip) 468 { 469 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 470 struct buffer_head *bh; 471 struct gfs2_ea_header *ea; 472 473 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 474 gfs2_trans_add_meta(ip->i_gl, bh); 475 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 476 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 477 478 ea = GFS2_EA_BH2FIRST(bh); 479 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 480 ea->ea_type = GFS2_EATYPE_UNUSED; 481 ea->ea_flags = GFS2_EAFLAG_LAST; 482 483 brelse(bh); 484 } 485 486 /** 487 * init_dinode - Fill in a new dinode structure 488 * @dip: The directory this inode is being created in 489 * @ip: The inode 490 * @symname: The symlink destination (if a symlink) 491 * 492 */ 493 494 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 495 const char *symname) 496 { 497 struct gfs2_dinode *di; 498 struct buffer_head *dibh; 499 500 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 501 gfs2_trans_add_meta(ip->i_gl, dibh); 502 di = (struct gfs2_dinode *)dibh->b_data; 503 gfs2_dinode_out(ip, di); 504 505 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 506 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 507 di->__pad1 = 0; 508 di->__pad2 = 0; 509 di->__pad3 = 0; 510 memset(&di->__pad4, 0, sizeof(di->__pad4)); 511 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 512 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 513 514 switch(ip->i_inode.i_mode & S_IFMT) { 515 case S_IFDIR: 516 gfs2_init_dir(dibh, dip); 517 break; 518 case S_IFLNK: 519 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 520 break; 521 } 522 523 set_buffer_uptodate(dibh); 524 brelse(dibh); 525 } 526 527 /** 528 * gfs2_trans_da_blks - Calculate number of blocks to link inode 529 * @dip: The directory we are linking into 530 * @da: The dir add information 531 * @nr_inodes: The number of inodes involved 532 * 533 * This calculate the number of blocks we need to reserve in a 534 * transaction to link @nr_inodes into a directory. In most cases 535 * @nr_inodes will be 2 (the directory plus the inode being linked in) 536 * but in case of rename, 4 may be required. 537 * 538 * Returns: Number of blocks 539 */ 540 541 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 542 const struct gfs2_diradd *da, 543 unsigned nr_inodes) 544 { 545 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 546 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 547 } 548 549 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 550 struct gfs2_inode *ip, struct gfs2_diradd *da) 551 { 552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 553 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 554 int error; 555 556 if (da->nr_blocks) { 557 error = gfs2_quota_lock_check(dip, &ap); 558 if (error) 559 goto fail_quota_locks; 560 561 error = gfs2_inplace_reserve(dip, &ap); 562 if (error) 563 goto fail_quota_locks; 564 565 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 566 if (error) 567 goto fail_ipreserv; 568 } else { 569 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 570 if (error) 571 goto fail_quota_locks; 572 } 573 574 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 575 576 gfs2_trans_end(sdp); 577 fail_ipreserv: 578 gfs2_inplace_release(dip); 579 fail_quota_locks: 580 gfs2_quota_unlock(dip); 581 return error; 582 } 583 584 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 585 void *fs_info) 586 { 587 const struct xattr *xattr; 588 int err = 0; 589 590 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 591 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 592 xattr->value_len, 0, 593 GFS2_EATYPE_SECURITY); 594 if (err < 0) 595 break; 596 } 597 return err; 598 } 599 600 /** 601 * gfs2_create_inode - Create a new inode 602 * @dir: The parent directory 603 * @dentry: The new dentry 604 * @file: If non-NULL, the file which is being opened 605 * @mode: The permissions on the new inode 606 * @dev: For device nodes, this is the device number 607 * @symname: For symlinks, this is the link destination 608 * @size: The initial size of the inode (ignored for directories) 609 * @excl: Force fail if inode exists 610 * 611 * FIXME: Change to allocate the disk blocks and write them out in the same 612 * transaction. That way, we can no longer end up in a situation in which an 613 * inode is allocated, the node crashes, and the block looks like a valid 614 * inode. (With atomic creates in place, we will also no longer need to zero 615 * the link count and dirty the inode here on failure.) 616 * 617 * Returns: 0 on success, or error code 618 */ 619 620 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 621 struct file *file, 622 umode_t mode, dev_t dev, const char *symname, 623 unsigned int size, int excl) 624 { 625 const struct qstr *name = &dentry->d_name; 626 struct posix_acl *default_acl, *acl; 627 struct gfs2_holder d_gh, gh; 628 struct inode *inode = NULL; 629 struct gfs2_inode *dip = GFS2_I(dir), *ip; 630 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 631 struct gfs2_glock *io_gl; 632 int error; 633 u32 aflags = 0; 634 unsigned blocks = 1; 635 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 636 637 if (!name->len || name->len > GFS2_FNAMESIZE) 638 return -ENAMETOOLONG; 639 640 error = gfs2_qa_get(dip); 641 if (error) 642 return error; 643 644 error = gfs2_rindex_update(sdp); 645 if (error) 646 goto fail; 647 648 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 649 if (error) 650 goto fail; 651 gfs2_holder_mark_uninitialized(&gh); 652 653 error = create_ok(dip, name, mode); 654 if (error) 655 goto fail_gunlock; 656 657 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 658 error = PTR_ERR(inode); 659 if (!IS_ERR(inode)) { 660 if (S_ISDIR(inode->i_mode)) { 661 iput(inode); 662 inode = ERR_PTR(-EISDIR); 663 goto fail_gunlock; 664 } 665 d_instantiate(dentry, inode); 666 error = 0; 667 if (file) { 668 if (S_ISREG(inode->i_mode)) 669 error = finish_open(file, dentry, gfs2_open_common); 670 else 671 error = finish_no_open(file, NULL); 672 } 673 gfs2_glock_dq_uninit(&d_gh); 674 goto fail; 675 } else if (error != -ENOENT) { 676 goto fail_gunlock; 677 } 678 679 error = gfs2_diradd_alloc_required(dir, name, &da); 680 if (error < 0) 681 goto fail_gunlock; 682 683 inode = new_inode(sdp->sd_vfs); 684 error = -ENOMEM; 685 if (!inode) 686 goto fail_gunlock; 687 ip = GFS2_I(inode); 688 689 error = posix_acl_create(dir, &mode, &default_acl, &acl); 690 if (error) 691 goto fail_gunlock; 692 693 error = gfs2_qa_get(ip); 694 if (error) 695 goto fail_free_acls; 696 697 inode->i_mode = mode; 698 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 699 inode->i_rdev = dev; 700 inode->i_size = size; 701 simple_inode_init_ts(inode); 702 munge_mode_uid_gid(dip, inode); 703 check_and_update_goal(dip); 704 ip->i_goal = dip->i_goal; 705 ip->i_diskflags = 0; 706 ip->i_eattr = 0; 707 ip->i_height = 0; 708 ip->i_depth = 0; 709 ip->i_entries = 0; 710 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 711 712 switch(mode & S_IFMT) { 713 case S_IFREG: 714 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 715 gfs2_tune_get(sdp, gt_new_files_jdata)) 716 ip->i_diskflags |= GFS2_DIF_JDATA; 717 gfs2_set_aops(inode); 718 break; 719 case S_IFDIR: 720 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 721 ip->i_diskflags |= GFS2_DIF_JDATA; 722 ip->i_entries = 2; 723 break; 724 } 725 726 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 727 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 728 ip->i_diskflags |= GFS2_DIF_SYSTEM; 729 730 gfs2_set_inode_flags(inode); 731 732 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 733 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 734 aflags |= GFS2_AF_ORLOV; 735 736 if (default_acl || acl) 737 blocks++; 738 739 error = alloc_dinode(ip, aflags, &blocks); 740 if (error) 741 goto fail_free_inode; 742 743 gfs2_set_inode_blocks(inode, blocks); 744 745 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 746 if (error) 747 goto fail_free_inode; 748 749 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 750 if (error) 751 goto fail_free_inode; 752 gfs2_cancel_delete_work(io_gl); 753 io_gl->gl_no_formal_ino = ip->i_no_formal_ino; 754 755 retry: 756 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 757 if (error == -EBUSY) 758 goto retry; 759 if (error) 760 goto fail_gunlock2; 761 762 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 763 &ip->i_iopen_gh); 764 if (error) 765 goto fail_gunlock2; 766 767 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 768 if (error) 769 goto fail_gunlock3; 770 771 error = gfs2_trans_begin(sdp, blocks, 0); 772 if (error) 773 goto fail_gunlock3; 774 775 if (blocks > 1) 776 gfs2_init_xattr(ip); 777 init_dinode(dip, ip, symname); 778 gfs2_trans_end(sdp); 779 780 glock_set_object(ip->i_gl, ip); 781 glock_set_object(io_gl, ip); 782 gfs2_set_iop(inode); 783 784 if (default_acl) { 785 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 786 if (error) 787 goto fail_gunlock4; 788 posix_acl_release(default_acl); 789 default_acl = NULL; 790 } 791 if (acl) { 792 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 793 if (error) 794 goto fail_gunlock4; 795 posix_acl_release(acl); 796 acl = NULL; 797 } 798 799 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 800 &gfs2_initxattrs, NULL); 801 if (error) 802 goto fail_gunlock4; 803 804 error = link_dinode(dip, name, ip, &da); 805 if (error) 806 goto fail_gunlock4; 807 808 mark_inode_dirty(inode); 809 d_instantiate(dentry, inode); 810 /* After instantiate, errors should result in evict which will destroy 811 * both inode and iopen glocks properly. */ 812 if (file) { 813 file->f_mode |= FMODE_CREATED; 814 error = finish_open(file, dentry, gfs2_open_common); 815 } 816 gfs2_glock_dq_uninit(&d_gh); 817 gfs2_qa_put(ip); 818 gfs2_glock_dq_uninit(&gh); 819 gfs2_glock_put(io_gl); 820 gfs2_qa_put(dip); 821 unlock_new_inode(inode); 822 return error; 823 824 fail_gunlock4: 825 glock_clear_object(ip->i_gl, ip); 826 glock_clear_object(io_gl, ip); 827 fail_gunlock3: 828 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 829 fail_gunlock2: 830 gfs2_glock_put(io_gl); 831 fail_free_inode: 832 if (ip->i_gl) { 833 gfs2_glock_put(ip->i_gl); 834 ip->i_gl = NULL; 835 } 836 gfs2_rs_deltree(&ip->i_res); 837 gfs2_qa_put(ip); 838 fail_free_acls: 839 posix_acl_release(default_acl); 840 posix_acl_release(acl); 841 fail_gunlock: 842 gfs2_dir_no_add(&da); 843 gfs2_glock_dq_uninit(&d_gh); 844 if (!IS_ERR_OR_NULL(inode)) { 845 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 846 clear_nlink(inode); 847 if (ip->i_no_addr) 848 mark_inode_dirty(inode); 849 if (inode->i_state & I_NEW) 850 iget_failed(inode); 851 else 852 iput(inode); 853 } 854 if (gfs2_holder_initialized(&gh)) 855 gfs2_glock_dq_uninit(&gh); 856 fail: 857 gfs2_qa_put(dip); 858 return error; 859 } 860 861 /** 862 * gfs2_create - Create a file 863 * @idmap: idmap of the mount the inode was found from 864 * @dir: The directory in which to create the file 865 * @dentry: The dentry of the new file 866 * @mode: The mode of the new file 867 * @excl: Force fail if inode exists 868 * 869 * Returns: errno 870 */ 871 872 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 873 struct dentry *dentry, umode_t mode, bool excl) 874 { 875 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 876 } 877 878 /** 879 * __gfs2_lookup - Look up a filename in a directory and return its inode 880 * @dir: The directory inode 881 * @dentry: The dentry of the new inode 882 * @file: File to be opened 883 * 884 * 885 * Returns: errno 886 */ 887 888 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 889 struct file *file) 890 { 891 struct inode *inode; 892 struct dentry *d; 893 struct gfs2_holder gh; 894 struct gfs2_glock *gl; 895 int error; 896 897 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 898 if (inode == NULL) { 899 d_add(dentry, NULL); 900 return NULL; 901 } 902 if (IS_ERR(inode)) 903 return ERR_CAST(inode); 904 905 gl = GFS2_I(inode)->i_gl; 906 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 907 if (error) { 908 iput(inode); 909 return ERR_PTR(error); 910 } 911 912 d = d_splice_alias(inode, dentry); 913 if (IS_ERR(d)) { 914 gfs2_glock_dq_uninit(&gh); 915 return d; 916 } 917 if (file && S_ISREG(inode->i_mode)) 918 error = finish_open(file, dentry, gfs2_open_common); 919 920 gfs2_glock_dq_uninit(&gh); 921 if (error) { 922 dput(d); 923 return ERR_PTR(error); 924 } 925 return d; 926 } 927 928 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 929 unsigned flags) 930 { 931 return __gfs2_lookup(dir, dentry, NULL); 932 } 933 934 /** 935 * gfs2_link - Link to a file 936 * @old_dentry: The inode to link 937 * @dir: Add link to this directory 938 * @dentry: The name of the link 939 * 940 * Link the inode in "old_dentry" into the directory "dir" with the 941 * name in "dentry". 942 * 943 * Returns: errno 944 */ 945 946 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 947 struct dentry *dentry) 948 { 949 struct gfs2_inode *dip = GFS2_I(dir); 950 struct gfs2_sbd *sdp = GFS2_SB(dir); 951 struct inode *inode = d_inode(old_dentry); 952 struct gfs2_inode *ip = GFS2_I(inode); 953 struct gfs2_holder d_gh, gh; 954 struct buffer_head *dibh; 955 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 956 int error; 957 958 if (S_ISDIR(inode->i_mode)) 959 return -EPERM; 960 961 error = gfs2_qa_get(dip); 962 if (error) 963 return error; 964 965 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 966 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 967 968 error = gfs2_glock_nq(&d_gh); 969 if (error) 970 goto out_parent; 971 972 error = gfs2_glock_nq(&gh); 973 if (error) 974 goto out_child; 975 976 error = -ENOENT; 977 if (inode->i_nlink == 0) 978 goto out_gunlock; 979 980 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 981 if (error) 982 goto out_gunlock; 983 984 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 985 switch (error) { 986 case -ENOENT: 987 break; 988 case 0: 989 error = -EEXIST; 990 goto out_gunlock; 991 default: 992 goto out_gunlock; 993 } 994 995 error = -EINVAL; 996 if (!dip->i_inode.i_nlink) 997 goto out_gunlock; 998 error = -EFBIG; 999 if (dip->i_entries == (u32)-1) 1000 goto out_gunlock; 1001 error = -EPERM; 1002 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1003 goto out_gunlock; 1004 error = -EMLINK; 1005 if (ip->i_inode.i_nlink == (u32)-1) 1006 goto out_gunlock; 1007 1008 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1009 if (error < 0) 1010 goto out_gunlock; 1011 1012 if (da.nr_blocks) { 1013 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1014 error = gfs2_quota_lock_check(dip, &ap); 1015 if (error) 1016 goto out_gunlock; 1017 1018 error = gfs2_inplace_reserve(dip, &ap); 1019 if (error) 1020 goto out_gunlock_q; 1021 1022 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1023 if (error) 1024 goto out_ipres; 1025 } else { 1026 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1027 if (error) 1028 goto out_ipres; 1029 } 1030 1031 error = gfs2_meta_inode_buffer(ip, &dibh); 1032 if (error) 1033 goto out_end_trans; 1034 1035 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1036 if (error) 1037 goto out_brelse; 1038 1039 gfs2_trans_add_meta(ip->i_gl, dibh); 1040 inc_nlink(&ip->i_inode); 1041 inode_set_ctime_current(&ip->i_inode); 1042 ihold(inode); 1043 d_instantiate(dentry, inode); 1044 mark_inode_dirty(inode); 1045 1046 out_brelse: 1047 brelse(dibh); 1048 out_end_trans: 1049 gfs2_trans_end(sdp); 1050 out_ipres: 1051 if (da.nr_blocks) 1052 gfs2_inplace_release(dip); 1053 out_gunlock_q: 1054 if (da.nr_blocks) 1055 gfs2_quota_unlock(dip); 1056 out_gunlock: 1057 gfs2_dir_no_add(&da); 1058 gfs2_glock_dq(&gh); 1059 out_child: 1060 gfs2_glock_dq(&d_gh); 1061 out_parent: 1062 gfs2_qa_put(dip); 1063 gfs2_holder_uninit(&d_gh); 1064 gfs2_holder_uninit(&gh); 1065 return error; 1066 } 1067 1068 /* 1069 * gfs2_unlink_ok - check to see that a inode is still in a directory 1070 * @dip: the directory 1071 * @name: the name of the file 1072 * @ip: the inode 1073 * 1074 * Assumes that the lock on (at least) @dip is held. 1075 * 1076 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1077 */ 1078 1079 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1080 const struct gfs2_inode *ip) 1081 { 1082 int error; 1083 1084 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1085 return -EPERM; 1086 1087 if ((dip->i_inode.i_mode & S_ISVTX) && 1088 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1089 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1090 return -EPERM; 1091 1092 if (IS_APPEND(&dip->i_inode)) 1093 return -EPERM; 1094 1095 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1096 MAY_WRITE | MAY_EXEC); 1097 if (error) 1098 return error; 1099 1100 return gfs2_dir_check(&dip->i_inode, name, ip); 1101 } 1102 1103 /** 1104 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1105 * @dip: The parent directory 1106 * @dentry: The dentry to unlink 1107 * 1108 * Called with all the locks and in a transaction. This will only be 1109 * called for a directory after it has been checked to ensure it is empty. 1110 * 1111 * Returns: 0 on success, or an error 1112 */ 1113 1114 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1115 const struct dentry *dentry) 1116 { 1117 struct inode *inode = d_inode(dentry); 1118 struct gfs2_inode *ip = GFS2_I(inode); 1119 int error; 1120 1121 error = gfs2_dir_del(dip, dentry); 1122 if (error) 1123 return error; 1124 1125 ip->i_entries = 0; 1126 inode_set_ctime_current(inode); 1127 if (S_ISDIR(inode->i_mode)) 1128 clear_nlink(inode); 1129 else 1130 drop_nlink(inode); 1131 mark_inode_dirty(inode); 1132 if (inode->i_nlink == 0) 1133 gfs2_unlink_di(inode); 1134 return 0; 1135 } 1136 1137 1138 /** 1139 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1140 * @dir: The inode of the directory containing the inode to unlink 1141 * @dentry: The file itself 1142 * 1143 * This routine uses the type of the inode as a flag to figure out 1144 * whether this is an unlink or an rmdir. 1145 * 1146 * Returns: errno 1147 */ 1148 1149 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1150 { 1151 struct gfs2_inode *dip = GFS2_I(dir); 1152 struct gfs2_sbd *sdp = GFS2_SB(dir); 1153 struct inode *inode = d_inode(dentry); 1154 struct gfs2_inode *ip = GFS2_I(inode); 1155 struct gfs2_holder d_gh, r_gh, gh; 1156 struct gfs2_rgrpd *rgd; 1157 int error; 1158 1159 error = gfs2_rindex_update(sdp); 1160 if (error) 1161 return error; 1162 1163 error = -EROFS; 1164 1165 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1166 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1167 1168 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1169 if (!rgd) 1170 goto out_inodes; 1171 1172 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1173 1174 1175 error = gfs2_glock_nq(&d_gh); 1176 if (error) 1177 goto out_parent; 1178 1179 error = gfs2_glock_nq(&gh); 1180 if (error) 1181 goto out_child; 1182 1183 error = -ENOENT; 1184 if (inode->i_nlink == 0) 1185 goto out_rgrp; 1186 1187 if (S_ISDIR(inode->i_mode)) { 1188 error = -ENOTEMPTY; 1189 if (ip->i_entries > 2 || inode->i_nlink > 2) 1190 goto out_rgrp; 1191 } 1192 1193 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1194 if (error) 1195 goto out_rgrp; 1196 1197 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1198 if (error) 1199 goto out_gunlock; 1200 1201 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1202 if (error) 1203 goto out_gunlock; 1204 1205 error = gfs2_unlink_inode(dip, dentry); 1206 gfs2_trans_end(sdp); 1207 1208 out_gunlock: 1209 gfs2_glock_dq(&r_gh); 1210 out_rgrp: 1211 gfs2_glock_dq(&gh); 1212 out_child: 1213 gfs2_glock_dq(&d_gh); 1214 out_parent: 1215 gfs2_holder_uninit(&r_gh); 1216 out_inodes: 1217 gfs2_holder_uninit(&gh); 1218 gfs2_holder_uninit(&d_gh); 1219 return error; 1220 } 1221 1222 /** 1223 * gfs2_symlink - Create a symlink 1224 * @idmap: idmap of the mount the inode was found from 1225 * @dir: The directory to create the symlink in 1226 * @dentry: The dentry to put the symlink in 1227 * @symname: The thing which the link points to 1228 * 1229 * Returns: errno 1230 */ 1231 1232 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1233 struct dentry *dentry, const char *symname) 1234 { 1235 unsigned int size; 1236 1237 size = strlen(symname); 1238 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1239 return -ENAMETOOLONG; 1240 1241 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1242 } 1243 1244 /** 1245 * gfs2_mkdir - Make a directory 1246 * @idmap: idmap of the mount the inode was found from 1247 * @dir: The parent directory of the new one 1248 * @dentry: The dentry of the new directory 1249 * @mode: The mode of the new directory 1250 * 1251 * Returns: the dentry, or ERR_PTR(errno) 1252 */ 1253 1254 static struct dentry *gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1255 struct dentry *dentry, umode_t mode) 1256 { 1257 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1258 1259 return ERR_PTR(gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0)); 1260 } 1261 1262 /** 1263 * gfs2_mknod - Make a special file 1264 * @idmap: idmap of the mount the inode was found from 1265 * @dir: The directory in which the special file will reside 1266 * @dentry: The dentry of the special file 1267 * @mode: The mode of the special file 1268 * @dev: The device specification of the special file 1269 * 1270 */ 1271 1272 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1273 struct dentry *dentry, umode_t mode, dev_t dev) 1274 { 1275 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1276 } 1277 1278 /** 1279 * gfs2_atomic_open - Atomically open a file 1280 * @dir: The directory 1281 * @dentry: The proposed new entry 1282 * @file: The proposed new struct file 1283 * @flags: open flags 1284 * @mode: File mode 1285 * 1286 * Returns: error code or 0 for success 1287 */ 1288 1289 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1290 struct file *file, unsigned flags, 1291 umode_t mode) 1292 { 1293 struct dentry *d; 1294 bool excl = !!(flags & O_EXCL); 1295 1296 if (!d_in_lookup(dentry)) 1297 goto skip_lookup; 1298 1299 d = __gfs2_lookup(dir, dentry, file); 1300 if (IS_ERR(d)) 1301 return PTR_ERR(d); 1302 if (d != NULL) 1303 dentry = d; 1304 if (d_really_is_positive(dentry)) { 1305 if (!(file->f_mode & FMODE_OPENED)) 1306 return finish_no_open(file, d); 1307 dput(d); 1308 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1309 } 1310 1311 BUG_ON(d != NULL); 1312 1313 skip_lookup: 1314 if (!(flags & O_CREAT)) 1315 return -ENOENT; 1316 1317 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1318 } 1319 1320 /* 1321 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1322 * @this: move this 1323 * @to: to here 1324 * 1325 * Follow @to back to the root and make sure we don't encounter @this 1326 * Assumes we already hold the rename lock. 1327 * 1328 * Returns: errno 1329 */ 1330 1331 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1332 { 1333 struct inode *dir = &to->i_inode; 1334 struct super_block *sb = dir->i_sb; 1335 struct inode *tmp; 1336 int error = 0; 1337 1338 igrab(dir); 1339 1340 for (;;) { 1341 if (dir == &this->i_inode) { 1342 error = -EINVAL; 1343 break; 1344 } 1345 if (dir == d_inode(sb->s_root)) { 1346 error = 0; 1347 break; 1348 } 1349 1350 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1351 if (!tmp) { 1352 error = -ENOENT; 1353 break; 1354 } 1355 if (IS_ERR(tmp)) { 1356 error = PTR_ERR(tmp); 1357 break; 1358 } 1359 1360 iput(dir); 1361 dir = tmp; 1362 } 1363 1364 iput(dir); 1365 1366 return error; 1367 } 1368 1369 /** 1370 * update_moved_ino - Update an inode that's being moved 1371 * @ip: The inode being moved 1372 * @ndip: The parent directory of the new filename 1373 * @dir_rename: True of ip is a directory 1374 * 1375 * Returns: errno 1376 */ 1377 1378 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1379 int dir_rename) 1380 { 1381 if (dir_rename) 1382 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1383 1384 inode_set_ctime_current(&ip->i_inode); 1385 mark_inode_dirty_sync(&ip->i_inode); 1386 return 0; 1387 } 1388 1389 1390 /** 1391 * gfs2_rename - Rename a file 1392 * @odir: Parent directory of old file name 1393 * @odentry: The old dentry of the file 1394 * @ndir: Parent directory of new file name 1395 * @ndentry: The new dentry of the file 1396 * 1397 * Returns: errno 1398 */ 1399 1400 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1401 struct inode *ndir, struct dentry *ndentry) 1402 { 1403 struct gfs2_inode *odip = GFS2_I(odir); 1404 struct gfs2_inode *ndip = GFS2_I(ndir); 1405 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1406 struct gfs2_inode *nip = NULL; 1407 struct gfs2_sbd *sdp = GFS2_SB(odir); 1408 struct gfs2_holder ghs[4], r_gh, rd_gh; 1409 struct gfs2_rgrpd *nrgd; 1410 unsigned int num_gh; 1411 int dir_rename = 0; 1412 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1413 unsigned int x; 1414 int error; 1415 1416 gfs2_holder_mark_uninitialized(&r_gh); 1417 gfs2_holder_mark_uninitialized(&rd_gh); 1418 if (d_really_is_positive(ndentry)) { 1419 nip = GFS2_I(d_inode(ndentry)); 1420 if (ip == nip) 1421 return 0; 1422 } 1423 1424 error = gfs2_rindex_update(sdp); 1425 if (error) 1426 return error; 1427 1428 error = gfs2_qa_get(ndip); 1429 if (error) 1430 return error; 1431 1432 if (odip != ndip) { 1433 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1434 0, &r_gh); 1435 if (error) 1436 goto out; 1437 1438 if (S_ISDIR(ip->i_inode.i_mode)) { 1439 dir_rename = 1; 1440 /* don't move a directory into its subdir */ 1441 error = gfs2_ok_to_move(ip, ndip); 1442 if (error) 1443 goto out_gunlock_r; 1444 } 1445 } 1446 1447 num_gh = 1; 1448 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1449 if (odip != ndip) { 1450 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1451 ghs + num_gh); 1452 num_gh++; 1453 } 1454 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1455 num_gh++; 1456 1457 if (nip) { 1458 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1459 ghs + num_gh); 1460 num_gh++; 1461 } 1462 1463 for (x = 0; x < num_gh; x++) { 1464 error = gfs2_glock_nq(ghs + x); 1465 if (error) 1466 goto out_gunlock; 1467 } 1468 error = gfs2_glock_async_wait(num_gh, ghs); 1469 if (error) 1470 goto out_gunlock; 1471 1472 if (nip) { 1473 /* Grab the resource group glock for unlink flag twiddling. 1474 * This is the case where the target dinode already exists 1475 * so we unlink before doing the rename. 1476 */ 1477 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1478 if (!nrgd) { 1479 error = -ENOENT; 1480 goto out_gunlock; 1481 } 1482 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1483 LM_FLAG_NODE_SCOPE, &rd_gh); 1484 if (error) 1485 goto out_gunlock; 1486 } 1487 1488 error = -ENOENT; 1489 if (ip->i_inode.i_nlink == 0) 1490 goto out_gunlock; 1491 1492 /* Check out the old directory */ 1493 1494 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1495 if (error) 1496 goto out_gunlock; 1497 1498 /* Check out the new directory */ 1499 1500 if (nip) { 1501 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1502 if (error) 1503 goto out_gunlock; 1504 1505 if (nip->i_inode.i_nlink == 0) { 1506 error = -EAGAIN; 1507 goto out_gunlock; 1508 } 1509 1510 if (S_ISDIR(nip->i_inode.i_mode)) { 1511 if (nip->i_entries < 2) { 1512 gfs2_consist_inode(nip); 1513 error = -EIO; 1514 goto out_gunlock; 1515 } 1516 if (nip->i_entries > 2) { 1517 error = -ENOTEMPTY; 1518 goto out_gunlock; 1519 } 1520 } 1521 } else { 1522 error = gfs2_permission(&nop_mnt_idmap, ndir, 1523 MAY_WRITE | MAY_EXEC); 1524 if (error) 1525 goto out_gunlock; 1526 1527 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1528 switch (error) { 1529 case -ENOENT: 1530 error = 0; 1531 break; 1532 case 0: 1533 error = -EEXIST; 1534 goto out_gunlock; 1535 default: 1536 goto out_gunlock; 1537 } 1538 1539 if (odip != ndip) { 1540 if (!ndip->i_inode.i_nlink) { 1541 error = -ENOENT; 1542 goto out_gunlock; 1543 } 1544 if (ndip->i_entries == (u32)-1) { 1545 error = -EFBIG; 1546 goto out_gunlock; 1547 } 1548 if (S_ISDIR(ip->i_inode.i_mode) && 1549 ndip->i_inode.i_nlink == (u32)-1) { 1550 error = -EMLINK; 1551 goto out_gunlock; 1552 } 1553 } 1554 } 1555 1556 /* Check out the dir to be renamed */ 1557 1558 if (dir_rename) { 1559 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1560 MAY_WRITE); 1561 if (error) 1562 goto out_gunlock; 1563 } 1564 1565 if (nip == NULL) { 1566 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1567 if (error) 1568 goto out_gunlock; 1569 } 1570 1571 if (da.nr_blocks) { 1572 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1573 error = gfs2_quota_lock_check(ndip, &ap); 1574 if (error) 1575 goto out_gunlock; 1576 1577 error = gfs2_inplace_reserve(ndip, &ap); 1578 if (error) 1579 goto out_gunlock_q; 1580 1581 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1582 4 * RES_LEAF + 4, 0); 1583 if (error) 1584 goto out_ipreserv; 1585 } else { 1586 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1587 5 * RES_LEAF + 4, 0); 1588 if (error) 1589 goto out_gunlock; 1590 } 1591 1592 /* Remove the target file, if it exists */ 1593 1594 if (nip) 1595 error = gfs2_unlink_inode(ndip, ndentry); 1596 1597 error = update_moved_ino(ip, ndip, dir_rename); 1598 if (error) 1599 goto out_end_trans; 1600 1601 error = gfs2_dir_del(odip, odentry); 1602 if (error) 1603 goto out_end_trans; 1604 1605 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1606 if (error) 1607 goto out_end_trans; 1608 1609 out_end_trans: 1610 gfs2_trans_end(sdp); 1611 out_ipreserv: 1612 if (da.nr_blocks) 1613 gfs2_inplace_release(ndip); 1614 out_gunlock_q: 1615 if (da.nr_blocks) 1616 gfs2_quota_unlock(ndip); 1617 out_gunlock: 1618 gfs2_dir_no_add(&da); 1619 if (gfs2_holder_initialized(&rd_gh)) 1620 gfs2_glock_dq_uninit(&rd_gh); 1621 1622 while (x--) { 1623 if (gfs2_holder_queued(ghs + x)) 1624 gfs2_glock_dq(ghs + x); 1625 gfs2_holder_uninit(ghs + x); 1626 } 1627 out_gunlock_r: 1628 if (gfs2_holder_initialized(&r_gh)) 1629 gfs2_glock_dq_uninit(&r_gh); 1630 out: 1631 gfs2_qa_put(ndip); 1632 return error; 1633 } 1634 1635 /** 1636 * gfs2_exchange - exchange two files 1637 * @odir: Parent directory of old file name 1638 * @odentry: The old dentry of the file 1639 * @ndir: Parent directory of new file name 1640 * @ndentry: The new dentry of the file 1641 * @flags: The rename flags 1642 * 1643 * Returns: errno 1644 */ 1645 1646 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1647 struct inode *ndir, struct dentry *ndentry, 1648 unsigned int flags) 1649 { 1650 struct gfs2_inode *odip = GFS2_I(odir); 1651 struct gfs2_inode *ndip = GFS2_I(ndir); 1652 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1653 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1654 struct gfs2_sbd *sdp = GFS2_SB(odir); 1655 struct gfs2_holder ghs[4], r_gh; 1656 unsigned int num_gh; 1657 unsigned int x; 1658 umode_t old_mode = oip->i_inode.i_mode; 1659 umode_t new_mode = nip->i_inode.i_mode; 1660 int error; 1661 1662 gfs2_holder_mark_uninitialized(&r_gh); 1663 error = gfs2_rindex_update(sdp); 1664 if (error) 1665 return error; 1666 1667 if (odip != ndip) { 1668 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1669 0, &r_gh); 1670 if (error) 1671 goto out; 1672 1673 if (S_ISDIR(old_mode)) { 1674 /* don't move a directory into its subdir */ 1675 error = gfs2_ok_to_move(oip, ndip); 1676 if (error) 1677 goto out_gunlock_r; 1678 } 1679 1680 if (S_ISDIR(new_mode)) { 1681 /* don't move a directory into its subdir */ 1682 error = gfs2_ok_to_move(nip, odip); 1683 if (error) 1684 goto out_gunlock_r; 1685 } 1686 } 1687 1688 num_gh = 1; 1689 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1690 if (odip != ndip) { 1691 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1692 ghs + num_gh); 1693 num_gh++; 1694 } 1695 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1696 num_gh++; 1697 1698 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1699 num_gh++; 1700 1701 for (x = 0; x < num_gh; x++) { 1702 error = gfs2_glock_nq(ghs + x); 1703 if (error) 1704 goto out_gunlock; 1705 } 1706 1707 error = gfs2_glock_async_wait(num_gh, ghs); 1708 if (error) 1709 goto out_gunlock; 1710 1711 error = -ENOENT; 1712 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1713 goto out_gunlock; 1714 1715 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1716 if (error) 1717 goto out_gunlock; 1718 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1719 if (error) 1720 goto out_gunlock; 1721 1722 if (S_ISDIR(old_mode)) { 1723 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1724 MAY_WRITE); 1725 if (error) 1726 goto out_gunlock; 1727 } 1728 if (S_ISDIR(new_mode)) { 1729 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1730 MAY_WRITE); 1731 if (error) 1732 goto out_gunlock; 1733 } 1734 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1735 if (error) 1736 goto out_gunlock; 1737 1738 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1739 if (error) 1740 goto out_end_trans; 1741 1742 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1743 if (error) 1744 goto out_end_trans; 1745 1746 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1747 IF2DT(old_mode)); 1748 if (error) 1749 goto out_end_trans; 1750 1751 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1752 IF2DT(new_mode)); 1753 if (error) 1754 goto out_end_trans; 1755 1756 if (odip != ndip) { 1757 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1758 inc_nlink(&odip->i_inode); 1759 drop_nlink(&ndip->i_inode); 1760 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1761 inc_nlink(&ndip->i_inode); 1762 drop_nlink(&odip->i_inode); 1763 } 1764 } 1765 mark_inode_dirty(&ndip->i_inode); 1766 if (odip != ndip) 1767 mark_inode_dirty(&odip->i_inode); 1768 1769 out_end_trans: 1770 gfs2_trans_end(sdp); 1771 out_gunlock: 1772 while (x--) { 1773 if (gfs2_holder_queued(ghs + x)) 1774 gfs2_glock_dq(ghs + x); 1775 gfs2_holder_uninit(ghs + x); 1776 } 1777 out_gunlock_r: 1778 if (gfs2_holder_initialized(&r_gh)) 1779 gfs2_glock_dq_uninit(&r_gh); 1780 out: 1781 return error; 1782 } 1783 1784 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1785 struct dentry *odentry, struct inode *ndir, 1786 struct dentry *ndentry, unsigned int flags) 1787 { 1788 flags &= ~RENAME_NOREPLACE; 1789 1790 if (flags & ~RENAME_EXCHANGE) 1791 return -EINVAL; 1792 1793 if (flags & RENAME_EXCHANGE) 1794 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1795 1796 return gfs2_rename(odir, odentry, ndir, ndentry); 1797 } 1798 1799 /** 1800 * gfs2_get_link - Follow a symbolic link 1801 * @dentry: The dentry of the link 1802 * @inode: The inode of the link 1803 * @done: destructor for return value 1804 * 1805 * This can handle symlinks of any size. 1806 * 1807 * Returns: 0 on success or error code 1808 */ 1809 1810 static const char *gfs2_get_link(struct dentry *dentry, 1811 struct inode *inode, 1812 struct delayed_call *done) 1813 { 1814 struct gfs2_inode *ip = GFS2_I(inode); 1815 struct gfs2_holder i_gh; 1816 struct buffer_head *dibh; 1817 unsigned int size; 1818 char *buf; 1819 int error; 1820 1821 if (!dentry) 1822 return ERR_PTR(-ECHILD); 1823 1824 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1825 error = gfs2_glock_nq(&i_gh); 1826 if (error) { 1827 gfs2_holder_uninit(&i_gh); 1828 return ERR_PTR(error); 1829 } 1830 1831 size = (unsigned int)i_size_read(&ip->i_inode); 1832 if (size == 0) { 1833 gfs2_consist_inode(ip); 1834 buf = ERR_PTR(-EIO); 1835 goto out; 1836 } 1837 1838 error = gfs2_meta_inode_buffer(ip, &dibh); 1839 if (error) { 1840 buf = ERR_PTR(error); 1841 goto out; 1842 } 1843 1844 buf = kzalloc(size + 1, GFP_NOFS); 1845 if (!buf) 1846 buf = ERR_PTR(-ENOMEM); 1847 else 1848 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1849 brelse(dibh); 1850 out: 1851 gfs2_glock_dq_uninit(&i_gh); 1852 if (!IS_ERR(buf)) 1853 set_delayed_call(done, kfree_link, buf); 1854 return buf; 1855 } 1856 1857 /** 1858 * gfs2_permission 1859 * @idmap: idmap of the mount the inode was found from 1860 * @inode: The inode 1861 * @mask: The mask to be tested 1862 * 1863 * This may be called from the VFS directly, or from within GFS2 with the 1864 * inode locked, so we look to see if the glock is already locked and only 1865 * lock the glock if its not already been done. 1866 * 1867 * Returns: errno 1868 */ 1869 1870 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1871 int mask) 1872 { 1873 int may_not_block = mask & MAY_NOT_BLOCK; 1874 struct gfs2_inode *ip; 1875 struct gfs2_holder i_gh; 1876 struct gfs2_glock *gl; 1877 int error; 1878 1879 gfs2_holder_mark_uninitialized(&i_gh); 1880 ip = GFS2_I(inode); 1881 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1882 if (unlikely(!gl)) { 1883 /* inode is getting torn down, must be RCU mode */ 1884 WARN_ON_ONCE(!may_not_block); 1885 return -ECHILD; 1886 } 1887 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1888 if (may_not_block) 1889 return -ECHILD; 1890 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1891 if (error) 1892 return error; 1893 } 1894 1895 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1896 error = -EPERM; 1897 else 1898 error = generic_permission(&nop_mnt_idmap, inode, mask); 1899 if (gfs2_holder_initialized(&i_gh)) 1900 gfs2_glock_dq_uninit(&i_gh); 1901 1902 return error; 1903 } 1904 1905 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1906 { 1907 setattr_copy(&nop_mnt_idmap, inode, attr); 1908 mark_inode_dirty(inode); 1909 return 0; 1910 } 1911 1912 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1913 { 1914 int error; 1915 1916 if (current->journal_info) 1917 return __gfs2_setattr_simple(inode, attr); 1918 1919 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1920 if (error) 1921 return error; 1922 1923 error = __gfs2_setattr_simple(inode, attr); 1924 gfs2_trans_end(GFS2_SB(inode)); 1925 return error; 1926 } 1927 1928 static int setattr_chown(struct inode *inode, struct iattr *attr) 1929 { 1930 struct gfs2_inode *ip = GFS2_I(inode); 1931 struct gfs2_sbd *sdp = GFS2_SB(inode); 1932 kuid_t ouid, nuid; 1933 kgid_t ogid, ngid; 1934 int error; 1935 struct gfs2_alloc_parms ap = {}; 1936 1937 ouid = inode->i_uid; 1938 ogid = inode->i_gid; 1939 nuid = attr->ia_uid; 1940 ngid = attr->ia_gid; 1941 1942 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1943 ouid = nuid = NO_UID_QUOTA_CHANGE; 1944 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1945 ogid = ngid = NO_GID_QUOTA_CHANGE; 1946 error = gfs2_qa_get(ip); 1947 if (error) 1948 return error; 1949 1950 error = gfs2_rindex_update(sdp); 1951 if (error) 1952 goto out; 1953 1954 error = gfs2_quota_lock(ip, nuid, ngid); 1955 if (error) 1956 goto out; 1957 1958 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1959 1960 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1961 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1962 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1963 if (error) 1964 goto out_gunlock_q; 1965 } 1966 1967 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1968 if (error) 1969 goto out_gunlock_q; 1970 1971 error = gfs2_setattr_simple(inode, attr); 1972 if (error) 1973 goto out_end_trans; 1974 1975 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1976 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1977 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1978 gfs2_quota_change(ip, ap.target, nuid, ngid); 1979 } 1980 1981 out_end_trans: 1982 gfs2_trans_end(sdp); 1983 out_gunlock_q: 1984 gfs2_quota_unlock(ip); 1985 out: 1986 gfs2_qa_put(ip); 1987 return error; 1988 } 1989 1990 /** 1991 * gfs2_setattr - Change attributes on an inode 1992 * @idmap: idmap of the mount the inode was found from 1993 * @dentry: The dentry which is changing 1994 * @attr: The structure describing the change 1995 * 1996 * The VFS layer wants to change one or more of an inodes attributes. Write 1997 * that change out to disk. 1998 * 1999 * Returns: errno 2000 */ 2001 2002 static int gfs2_setattr(struct mnt_idmap *idmap, 2003 struct dentry *dentry, struct iattr *attr) 2004 { 2005 struct inode *inode = d_inode(dentry); 2006 struct gfs2_inode *ip = GFS2_I(inode); 2007 struct gfs2_holder i_gh; 2008 int error; 2009 2010 error = gfs2_qa_get(ip); 2011 if (error) 2012 return error; 2013 2014 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2015 if (error) 2016 goto out; 2017 2018 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2019 if (error) 2020 goto error; 2021 2022 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2023 if (error) 2024 goto error; 2025 2026 if (attr->ia_valid & ATTR_SIZE) 2027 error = gfs2_setattr_size(inode, attr->ia_size); 2028 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2029 error = setattr_chown(inode, attr); 2030 else { 2031 error = gfs2_setattr_simple(inode, attr); 2032 if (!error && attr->ia_valid & ATTR_MODE) 2033 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2034 inode->i_mode); 2035 } 2036 2037 error: 2038 if (!error) 2039 mark_inode_dirty(inode); 2040 gfs2_glock_dq_uninit(&i_gh); 2041 out: 2042 gfs2_qa_put(ip); 2043 return error; 2044 } 2045 2046 /** 2047 * gfs2_getattr - Read out an inode's attributes 2048 * @idmap: idmap of the mount the inode was found from 2049 * @path: Object to query 2050 * @stat: The inode's stats 2051 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2052 * @flags: AT_STATX_xxx setting 2053 * 2054 * This may be called from the VFS directly, or from within GFS2 with the 2055 * inode locked, so we look to see if the glock is already locked and only 2056 * lock the glock if its not already been done. Note that its the NFS 2057 * readdirplus operation which causes this to be called (from filldir) 2058 * with the glock already held. 2059 * 2060 * Returns: errno 2061 */ 2062 2063 static int gfs2_getattr(struct mnt_idmap *idmap, 2064 const struct path *path, struct kstat *stat, 2065 u32 request_mask, unsigned int flags) 2066 { 2067 struct inode *inode = d_inode(path->dentry); 2068 struct gfs2_inode *ip = GFS2_I(inode); 2069 struct gfs2_holder gh; 2070 u32 gfsflags; 2071 int error; 2072 2073 gfs2_holder_mark_uninitialized(&gh); 2074 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2075 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2076 if (error) 2077 return error; 2078 } 2079 2080 gfsflags = ip->i_diskflags; 2081 if (gfsflags & GFS2_DIF_APPENDONLY) 2082 stat->attributes |= STATX_ATTR_APPEND; 2083 if (gfsflags & GFS2_DIF_IMMUTABLE) 2084 stat->attributes |= STATX_ATTR_IMMUTABLE; 2085 2086 stat->attributes_mask |= (STATX_ATTR_APPEND | 2087 STATX_ATTR_COMPRESSED | 2088 STATX_ATTR_ENCRYPTED | 2089 STATX_ATTR_IMMUTABLE | 2090 STATX_ATTR_NODUMP); 2091 2092 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2093 2094 if (gfs2_holder_initialized(&gh)) 2095 gfs2_glock_dq_uninit(&gh); 2096 2097 return 0; 2098 } 2099 2100 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2101 u64 start, u64 len) 2102 { 2103 struct gfs2_inode *ip = GFS2_I(inode); 2104 struct gfs2_holder gh; 2105 int ret; 2106 2107 inode_lock_shared(inode); 2108 2109 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2110 if (ret) 2111 goto out; 2112 2113 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2114 2115 gfs2_glock_dq_uninit(&gh); 2116 2117 out: 2118 inode_unlock_shared(inode); 2119 return ret; 2120 } 2121 2122 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2123 { 2124 struct inode *inode = file->f_mapping->host; 2125 struct gfs2_inode *ip = GFS2_I(inode); 2126 struct gfs2_holder gh; 2127 loff_t ret; 2128 2129 inode_lock_shared(inode); 2130 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2131 if (!ret) 2132 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2133 gfs2_glock_dq_uninit(&gh); 2134 inode_unlock_shared(inode); 2135 2136 if (ret < 0) 2137 return ret; 2138 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2139 } 2140 2141 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2142 { 2143 struct inode *inode = file->f_mapping->host; 2144 struct gfs2_inode *ip = GFS2_I(inode); 2145 struct gfs2_holder gh; 2146 loff_t ret; 2147 2148 inode_lock_shared(inode); 2149 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2150 if (!ret) 2151 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2152 gfs2_glock_dq_uninit(&gh); 2153 inode_unlock_shared(inode); 2154 2155 if (ret < 0) 2156 return ret; 2157 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2158 } 2159 2160 static int gfs2_update_time(struct inode *inode, int flags) 2161 { 2162 struct gfs2_inode *ip = GFS2_I(inode); 2163 struct gfs2_glock *gl = ip->i_gl; 2164 struct gfs2_holder *gh; 2165 int error; 2166 2167 gh = gfs2_glock_is_locked_by_me(gl); 2168 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) { 2169 gfs2_glock_dq(gh); 2170 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2171 error = gfs2_glock_nq(gh); 2172 if (error) 2173 return error; 2174 } 2175 generic_update_time(inode, flags); 2176 return 0; 2177 } 2178 2179 static const struct inode_operations gfs2_file_iops = { 2180 .permission = gfs2_permission, 2181 .setattr = gfs2_setattr, 2182 .getattr = gfs2_getattr, 2183 .listxattr = gfs2_listxattr, 2184 .fiemap = gfs2_fiemap, 2185 .get_inode_acl = gfs2_get_acl, 2186 .set_acl = gfs2_set_acl, 2187 .update_time = gfs2_update_time, 2188 .fileattr_get = gfs2_fileattr_get, 2189 .fileattr_set = gfs2_fileattr_set, 2190 }; 2191 2192 static const struct inode_operations gfs2_dir_iops = { 2193 .create = gfs2_create, 2194 .lookup = gfs2_lookup, 2195 .link = gfs2_link, 2196 .unlink = gfs2_unlink, 2197 .symlink = gfs2_symlink, 2198 .mkdir = gfs2_mkdir, 2199 .rmdir = gfs2_unlink, 2200 .mknod = gfs2_mknod, 2201 .rename = gfs2_rename2, 2202 .permission = gfs2_permission, 2203 .setattr = gfs2_setattr, 2204 .getattr = gfs2_getattr, 2205 .listxattr = gfs2_listxattr, 2206 .fiemap = gfs2_fiemap, 2207 .get_inode_acl = gfs2_get_acl, 2208 .set_acl = gfs2_set_acl, 2209 .update_time = gfs2_update_time, 2210 .atomic_open = gfs2_atomic_open, 2211 .fileattr_get = gfs2_fileattr_get, 2212 .fileattr_set = gfs2_fileattr_set, 2213 }; 2214 2215 static const struct inode_operations gfs2_symlink_iops = { 2216 .get_link = gfs2_get_link, 2217 .permission = gfs2_permission, 2218 .setattr = gfs2_setattr, 2219 .getattr = gfs2_getattr, 2220 .listxattr = gfs2_listxattr, 2221 .fiemap = gfs2_fiemap, 2222 }; 2223 2224