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->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 189 inode->i_atime.tv_nsec = 0; 190 191 glock_set_object(ip->i_gl, ip); 192 193 if (type == DT_UNKNOWN) { 194 /* Inode glock must be locked already */ 195 error = gfs2_instantiate(&i_gh); 196 if (error) { 197 glock_clear_object(ip->i_gl, ip); 198 goto fail; 199 } 200 } else { 201 ip->i_no_formal_ino = no_formal_ino; 202 inode->i_mode = DT2IF(type); 203 } 204 205 if (gfs2_holder_initialized(&i_gh)) 206 gfs2_glock_dq_uninit(&i_gh); 207 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 208 209 gfs2_set_iop(inode); 210 unlock_new_inode(inode); 211 } 212 213 if (no_formal_ino && ip->i_no_formal_ino && 214 no_formal_ino != ip->i_no_formal_ino) { 215 iput(inode); 216 return ERR_PTR(-ESTALE); 217 } 218 219 return inode; 220 221 fail: 222 if (error == GLR_TRYFAILED) 223 error = -EAGAIN; 224 if (gfs2_holder_initialized(&ip->i_iopen_gh)) 225 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 226 if (gfs2_holder_initialized(&i_gh)) 227 gfs2_glock_dq_uninit(&i_gh); 228 iget_failed(inode); 229 return ERR_PTR(error); 230 } 231 232 /** 233 * gfs2_lookup_by_inum - look up an inode by inode number 234 * @sdp: The super block 235 * @no_addr: The inode number 236 * @no_formal_ino: The inode generation number (0 for any) 237 * @blktype: Requested block type (see gfs2_inode_lookup) 238 */ 239 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 240 u64 no_formal_ino, unsigned int blktype) 241 { 242 struct super_block *sb = sdp->sd_vfs; 243 struct inode *inode; 244 int error; 245 246 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 247 blktype); 248 if (IS_ERR(inode)) 249 return inode; 250 251 if (no_formal_ino) { 252 error = -EIO; 253 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 254 goto fail_iput; 255 } 256 return inode; 257 258 fail_iput: 259 iput(inode); 260 return ERR_PTR(error); 261 } 262 263 264 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 265 { 266 struct qstr qstr; 267 struct inode *inode; 268 gfs2_str2qstr(&qstr, name); 269 inode = gfs2_lookupi(dip, &qstr, 1); 270 /* gfs2_lookupi has inconsistent callers: vfs 271 * related routines expect NULL for no entry found, 272 * gfs2_lookup_simple callers expect ENOENT 273 * and do not check for NULL. 274 */ 275 if (inode == NULL) 276 return ERR_PTR(-ENOENT); 277 else 278 return inode; 279 } 280 281 282 /** 283 * gfs2_lookupi - Look up a filename in a directory and return its inode 284 * @dir: The inode of the directory containing the inode to look-up 285 * @name: The name of the inode to look for 286 * @is_root: If 1, ignore the caller's permissions 287 * 288 * This can be called via the VFS filldir function when NFS is doing 289 * a readdirplus and the inode which its intending to stat isn't 290 * already in cache. In this case we must not take the directory glock 291 * again, since the readdir call will have already taken that lock. 292 * 293 * Returns: errno 294 */ 295 296 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 297 int is_root) 298 { 299 struct super_block *sb = dir->i_sb; 300 struct gfs2_inode *dip = GFS2_I(dir); 301 struct gfs2_holder d_gh; 302 int error = 0; 303 struct inode *inode = NULL; 304 305 gfs2_holder_mark_uninitialized(&d_gh); 306 if (!name->len || name->len > GFS2_FNAMESIZE) 307 return ERR_PTR(-ENAMETOOLONG); 308 309 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 310 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 311 dir == d_inode(sb->s_root))) { 312 igrab(dir); 313 return dir; 314 } 315 316 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 317 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 318 if (error) 319 return ERR_PTR(error); 320 } 321 322 if (!is_root) { 323 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); 324 if (error) 325 goto out; 326 } 327 328 inode = gfs2_dir_search(dir, name, false); 329 if (IS_ERR(inode)) 330 error = PTR_ERR(inode); 331 out: 332 if (gfs2_holder_initialized(&d_gh)) 333 gfs2_glock_dq_uninit(&d_gh); 334 if (error == -ENOENT) 335 return NULL; 336 return inode ? inode : ERR_PTR(error); 337 } 338 339 /** 340 * create_ok - OK to create a new on-disk inode here? 341 * @dip: Directory in which dinode is to be created 342 * @name: Name of new dinode 343 * @mode: 344 * 345 * Returns: errno 346 */ 347 348 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 349 umode_t mode) 350 { 351 int error; 352 353 error = gfs2_permission(&init_user_ns, &dip->i_inode, 354 MAY_WRITE | MAY_EXEC); 355 if (error) 356 return error; 357 358 /* Don't create entries in an unlinked directory */ 359 if (!dip->i_inode.i_nlink) 360 return -ENOENT; 361 362 if (dip->i_entries == (u32)-1) 363 return -EFBIG; 364 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 365 return -EMLINK; 366 367 return 0; 368 } 369 370 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 371 struct inode *inode) 372 { 373 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 374 (dip->i_inode.i_mode & S_ISUID) && 375 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 376 if (S_ISDIR(inode->i_mode)) 377 inode->i_mode |= S_ISUID; 378 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 379 inode->i_mode &= ~07111; 380 inode->i_uid = dip->i_inode.i_uid; 381 } else 382 inode->i_uid = current_fsuid(); 383 384 if (dip->i_inode.i_mode & S_ISGID) { 385 if (S_ISDIR(inode->i_mode)) 386 inode->i_mode |= S_ISGID; 387 inode->i_gid = dip->i_inode.i_gid; 388 } else 389 inode->i_gid = current_fsgid(); 390 } 391 392 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 393 { 394 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 395 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 396 int error; 397 398 error = gfs2_quota_lock_check(ip, &ap); 399 if (error) 400 goto out; 401 402 error = gfs2_inplace_reserve(ip, &ap); 403 if (error) 404 goto out_quota; 405 406 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 407 if (error) 408 goto out_ipreserv; 409 410 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 411 if (error) 412 goto out_trans_end; 413 414 ip->i_no_formal_ino = ip->i_generation; 415 ip->i_inode.i_ino = ip->i_no_addr; 416 ip->i_goal = ip->i_no_addr; 417 if (*dblocks > 1) 418 ip->i_eattr = ip->i_no_addr + 1; 419 420 out_trans_end: 421 gfs2_trans_end(sdp); 422 out_ipreserv: 423 gfs2_inplace_release(ip); 424 out_quota: 425 gfs2_quota_unlock(ip); 426 out: 427 return error; 428 } 429 430 static void gfs2_init_dir(struct buffer_head *dibh, 431 const struct gfs2_inode *parent) 432 { 433 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 434 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 435 436 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 437 dent->de_inum = di->di_num; /* already GFS2 endian */ 438 dent->de_type = cpu_to_be16(DT_DIR); 439 440 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 441 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 442 gfs2_inum_out(parent, dent); 443 dent->de_type = cpu_to_be16(DT_DIR); 444 445 } 446 447 /** 448 * gfs2_init_xattr - Initialise an xattr block for a new inode 449 * @ip: The inode in question 450 * 451 * This sets up an empty xattr block for a new inode, ready to 452 * take any ACLs, LSM xattrs, etc. 453 */ 454 455 static void gfs2_init_xattr(struct gfs2_inode *ip) 456 { 457 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 458 struct buffer_head *bh; 459 struct gfs2_ea_header *ea; 460 461 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 462 gfs2_trans_add_meta(ip->i_gl, bh); 463 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 464 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 465 466 ea = GFS2_EA_BH2FIRST(bh); 467 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 468 ea->ea_type = GFS2_EATYPE_UNUSED; 469 ea->ea_flags = GFS2_EAFLAG_LAST; 470 471 brelse(bh); 472 } 473 474 /** 475 * init_dinode - Fill in a new dinode structure 476 * @dip: The directory this inode is being created in 477 * @ip: The inode 478 * @symname: The symlink destination (if a symlink) 479 * 480 */ 481 482 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 483 const char *symname) 484 { 485 struct gfs2_dinode *di; 486 struct buffer_head *dibh; 487 488 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 489 gfs2_trans_add_meta(ip->i_gl, dibh); 490 di = (struct gfs2_dinode *)dibh->b_data; 491 gfs2_dinode_out(ip, di); 492 493 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 494 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 495 di->__pad1 = 0; 496 di->__pad2 = 0; 497 di->__pad3 = 0; 498 memset(&di->__pad4, 0, sizeof(di->__pad4)); 499 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 500 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 501 502 switch(ip->i_inode.i_mode & S_IFMT) { 503 case S_IFDIR: 504 gfs2_init_dir(dibh, dip); 505 break; 506 case S_IFLNK: 507 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 508 break; 509 } 510 511 set_buffer_uptodate(dibh); 512 brelse(dibh); 513 } 514 515 /** 516 * gfs2_trans_da_blks - Calculate number of blocks to link inode 517 * @dip: The directory we are linking into 518 * @da: The dir add information 519 * @nr_inodes: The number of inodes involved 520 * 521 * This calculate the number of blocks we need to reserve in a 522 * transaction to link @nr_inodes into a directory. In most cases 523 * @nr_inodes will be 2 (the directory plus the inode being linked in) 524 * but in case of rename, 4 may be required. 525 * 526 * Returns: Number of blocks 527 */ 528 529 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 530 const struct gfs2_diradd *da, 531 unsigned nr_inodes) 532 { 533 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 534 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 535 } 536 537 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 538 struct gfs2_inode *ip, struct gfs2_diradd *da) 539 { 540 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 541 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 542 int error; 543 544 if (da->nr_blocks) { 545 error = gfs2_quota_lock_check(dip, &ap); 546 if (error) 547 goto fail_quota_locks; 548 549 error = gfs2_inplace_reserve(dip, &ap); 550 if (error) 551 goto fail_quota_locks; 552 553 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 554 if (error) 555 goto fail_ipreserv; 556 } else { 557 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 558 if (error) 559 goto fail_quota_locks; 560 } 561 562 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 563 564 gfs2_trans_end(sdp); 565 fail_ipreserv: 566 gfs2_inplace_release(dip); 567 fail_quota_locks: 568 gfs2_quota_unlock(dip); 569 return error; 570 } 571 572 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 573 void *fs_info) 574 { 575 const struct xattr *xattr; 576 int err = 0; 577 578 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 579 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 580 xattr->value_len, 0, 581 GFS2_EATYPE_SECURITY); 582 if (err < 0) 583 break; 584 } 585 return err; 586 } 587 588 /** 589 * gfs2_create_inode - Create a new inode 590 * @dir: The parent directory 591 * @dentry: The new dentry 592 * @file: If non-NULL, the file which is being opened 593 * @mode: The permissions on the new inode 594 * @dev: For device nodes, this is the device number 595 * @symname: For symlinks, this is the link destination 596 * @size: The initial size of the inode (ignored for directories) 597 * @excl: Force fail if inode exists 598 * 599 * FIXME: Change to allocate the disk blocks and write them out in the same 600 * transaction. That way, we can no longer end up in a situation in which an 601 * inode is allocated, the node crashes, and the block looks like a valid 602 * inode. (With atomic creates in place, we will also no longer need to zero 603 * the link count and dirty the inode here on failure.) 604 * 605 * Returns: 0 on success, or error code 606 */ 607 608 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 609 struct file *file, 610 umode_t mode, dev_t dev, const char *symname, 611 unsigned int size, int excl) 612 { 613 const struct qstr *name = &dentry->d_name; 614 struct posix_acl *default_acl, *acl; 615 struct gfs2_holder d_gh, gh; 616 struct inode *inode = NULL; 617 struct gfs2_inode *dip = GFS2_I(dir), *ip; 618 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 619 struct gfs2_glock *io_gl; 620 int error; 621 u32 aflags = 0; 622 unsigned blocks = 1; 623 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 624 625 if (!name->len || name->len > GFS2_FNAMESIZE) 626 return -ENAMETOOLONG; 627 628 error = gfs2_qa_get(dip); 629 if (error) 630 return error; 631 632 error = gfs2_rindex_update(sdp); 633 if (error) 634 goto fail; 635 636 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 637 if (error) 638 goto fail; 639 gfs2_holder_mark_uninitialized(&gh); 640 641 error = create_ok(dip, name, mode); 642 if (error) 643 goto fail_gunlock; 644 645 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 646 error = PTR_ERR(inode); 647 if (!IS_ERR(inode)) { 648 if (S_ISDIR(inode->i_mode)) { 649 iput(inode); 650 inode = ERR_PTR(-EISDIR); 651 goto fail_gunlock; 652 } 653 d_instantiate(dentry, inode); 654 error = 0; 655 if (file) { 656 if (S_ISREG(inode->i_mode)) 657 error = finish_open(file, dentry, gfs2_open_common); 658 else 659 error = finish_no_open(file, NULL); 660 } 661 gfs2_glock_dq_uninit(&d_gh); 662 goto fail; 663 } else if (error != -ENOENT) { 664 goto fail_gunlock; 665 } 666 667 error = gfs2_diradd_alloc_required(dir, name, &da); 668 if (error < 0) 669 goto fail_gunlock; 670 671 inode = new_inode(sdp->sd_vfs); 672 error = -ENOMEM; 673 if (!inode) 674 goto fail_gunlock; 675 ip = GFS2_I(inode); 676 677 error = posix_acl_create(dir, &mode, &default_acl, &acl); 678 if (error) 679 goto fail_gunlock; 680 681 error = gfs2_qa_get(ip); 682 if (error) 683 goto fail_free_acls; 684 685 inode->i_mode = mode; 686 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 687 inode->i_rdev = dev; 688 inode->i_size = size; 689 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 690 munge_mode_uid_gid(dip, inode); 691 check_and_update_goal(dip); 692 ip->i_goal = dip->i_goal; 693 ip->i_diskflags = 0; 694 ip->i_eattr = 0; 695 ip->i_height = 0; 696 ip->i_depth = 0; 697 ip->i_entries = 0; 698 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 699 700 switch(mode & S_IFMT) { 701 case S_IFREG: 702 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 703 gfs2_tune_get(sdp, gt_new_files_jdata)) 704 ip->i_diskflags |= GFS2_DIF_JDATA; 705 gfs2_set_aops(inode); 706 break; 707 case S_IFDIR: 708 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 709 ip->i_diskflags |= GFS2_DIF_JDATA; 710 ip->i_entries = 2; 711 break; 712 } 713 714 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 715 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 716 ip->i_diskflags |= GFS2_DIF_SYSTEM; 717 718 gfs2_set_inode_flags(inode); 719 720 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 721 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 722 aflags |= GFS2_AF_ORLOV; 723 724 if (default_acl || acl) 725 blocks++; 726 727 error = alloc_dinode(ip, aflags, &blocks); 728 if (error) 729 goto fail_free_inode; 730 731 gfs2_set_inode_blocks(inode, blocks); 732 733 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 734 if (error) 735 goto fail_free_inode; 736 737 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 738 if (error) 739 goto fail_free_inode; 740 gfs2_cancel_delete_work(io_gl); 741 742 retry: 743 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 744 if (error == -EBUSY) 745 goto retry; 746 if (error) 747 goto fail_gunlock2; 748 749 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 750 &ip->i_iopen_gh); 751 if (error) 752 goto fail_gunlock2; 753 754 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 755 if (error) 756 goto fail_gunlock3; 757 758 error = gfs2_trans_begin(sdp, blocks, 0); 759 if (error) 760 goto fail_gunlock3; 761 762 if (blocks > 1) 763 gfs2_init_xattr(ip); 764 init_dinode(dip, ip, symname); 765 gfs2_trans_end(sdp); 766 767 glock_set_object(ip->i_gl, ip); 768 glock_set_object(io_gl, ip); 769 gfs2_set_iop(inode); 770 771 if (default_acl) { 772 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 773 if (error) 774 goto fail_gunlock4; 775 posix_acl_release(default_acl); 776 default_acl = NULL; 777 } 778 if (acl) { 779 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 780 if (error) 781 goto fail_gunlock4; 782 posix_acl_release(acl); 783 acl = NULL; 784 } 785 786 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 787 &gfs2_initxattrs, NULL); 788 if (error) 789 goto fail_gunlock4; 790 791 error = link_dinode(dip, name, ip, &da); 792 if (error) 793 goto fail_gunlock4; 794 795 mark_inode_dirty(inode); 796 d_instantiate(dentry, inode); 797 /* After instantiate, errors should result in evict which will destroy 798 * both inode and iopen glocks properly. */ 799 if (file) { 800 file->f_mode |= FMODE_CREATED; 801 error = finish_open(file, dentry, gfs2_open_common); 802 } 803 gfs2_glock_dq_uninit(&d_gh); 804 gfs2_qa_put(ip); 805 gfs2_glock_dq_uninit(&gh); 806 gfs2_glock_put(io_gl); 807 gfs2_qa_put(dip); 808 unlock_new_inode(inode); 809 return error; 810 811 fail_gunlock4: 812 glock_clear_object(ip->i_gl, ip); 813 glock_clear_object(io_gl, ip); 814 fail_gunlock3: 815 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 816 fail_gunlock2: 817 gfs2_glock_put(io_gl); 818 fail_free_inode: 819 gfs2_rs_deltree(&ip->i_res); 820 gfs2_qa_put(ip); 821 fail_free_acls: 822 posix_acl_release(default_acl); 823 posix_acl_release(acl); 824 fail_gunlock: 825 gfs2_dir_no_add(&da); 826 gfs2_glock_dq_uninit(&d_gh); 827 if (!IS_ERR_OR_NULL(inode)) { 828 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 829 clear_nlink(inode); 830 if (ip->i_no_addr) 831 mark_inode_dirty(inode); 832 if (inode->i_state & I_NEW) 833 iget_failed(inode); 834 else 835 iput(inode); 836 } 837 if (gfs2_holder_initialized(&gh)) 838 gfs2_glock_dq_uninit(&gh); 839 fail: 840 gfs2_qa_put(dip); 841 return error; 842 } 843 844 /** 845 * gfs2_create - Create a file 846 * @mnt_userns: User namespace of the mount the inode was found from 847 * @dir: The directory in which to create the file 848 * @dentry: The dentry of the new file 849 * @mode: The mode of the new file 850 * @excl: Force fail if inode exists 851 * 852 * Returns: errno 853 */ 854 855 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, 856 struct dentry *dentry, umode_t mode, bool excl) 857 { 858 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 859 } 860 861 /** 862 * __gfs2_lookup - Look up a filename in a directory and return its inode 863 * @dir: The directory inode 864 * @dentry: The dentry of the new inode 865 * @file: File to be opened 866 * 867 * 868 * Returns: errno 869 */ 870 871 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 872 struct file *file) 873 { 874 struct inode *inode; 875 struct dentry *d; 876 struct gfs2_holder gh; 877 struct gfs2_glock *gl; 878 int error; 879 880 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 881 if (inode == NULL) { 882 d_add(dentry, NULL); 883 return NULL; 884 } 885 if (IS_ERR(inode)) 886 return ERR_CAST(inode); 887 888 gl = GFS2_I(inode)->i_gl; 889 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 890 if (error) { 891 iput(inode); 892 return ERR_PTR(error); 893 } 894 895 d = d_splice_alias(inode, dentry); 896 if (IS_ERR(d)) { 897 gfs2_glock_dq_uninit(&gh); 898 return d; 899 } 900 if (file && S_ISREG(inode->i_mode)) 901 error = finish_open(file, dentry, gfs2_open_common); 902 903 gfs2_glock_dq_uninit(&gh); 904 if (error) { 905 dput(d); 906 return ERR_PTR(error); 907 } 908 return d; 909 } 910 911 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 912 unsigned flags) 913 { 914 return __gfs2_lookup(dir, dentry, NULL); 915 } 916 917 /** 918 * gfs2_link - Link to a file 919 * @old_dentry: The inode to link 920 * @dir: Add link to this directory 921 * @dentry: The name of the link 922 * 923 * Link the inode in "old_dentry" into the directory "dir" with the 924 * name in "dentry". 925 * 926 * Returns: errno 927 */ 928 929 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 930 struct dentry *dentry) 931 { 932 struct gfs2_inode *dip = GFS2_I(dir); 933 struct gfs2_sbd *sdp = GFS2_SB(dir); 934 struct inode *inode = d_inode(old_dentry); 935 struct gfs2_inode *ip = GFS2_I(inode); 936 struct gfs2_holder ghs[2]; 937 struct buffer_head *dibh; 938 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 939 int error; 940 941 if (S_ISDIR(inode->i_mode)) 942 return -EPERM; 943 944 error = gfs2_qa_get(dip); 945 if (error) 946 return error; 947 948 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 949 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 950 951 error = gfs2_glock_nq(ghs); /* parent */ 952 if (error) 953 goto out_parent; 954 955 error = gfs2_glock_nq(ghs + 1); /* child */ 956 if (error) 957 goto out_child; 958 959 error = -ENOENT; 960 if (inode->i_nlink == 0) 961 goto out_gunlock; 962 963 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC); 964 if (error) 965 goto out_gunlock; 966 967 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 968 switch (error) { 969 case -ENOENT: 970 break; 971 case 0: 972 error = -EEXIST; 973 goto out_gunlock; 974 default: 975 goto out_gunlock; 976 } 977 978 error = -EINVAL; 979 if (!dip->i_inode.i_nlink) 980 goto out_gunlock; 981 error = -EFBIG; 982 if (dip->i_entries == (u32)-1) 983 goto out_gunlock; 984 error = -EPERM; 985 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 986 goto out_gunlock; 987 error = -EINVAL; 988 if (!ip->i_inode.i_nlink) 989 goto out_gunlock; 990 error = -EMLINK; 991 if (ip->i_inode.i_nlink == (u32)-1) 992 goto out_gunlock; 993 994 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 995 if (error < 0) 996 goto out_gunlock; 997 998 if (da.nr_blocks) { 999 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1000 error = gfs2_quota_lock_check(dip, &ap); 1001 if (error) 1002 goto out_gunlock; 1003 1004 error = gfs2_inplace_reserve(dip, &ap); 1005 if (error) 1006 goto out_gunlock_q; 1007 1008 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1009 if (error) 1010 goto out_ipres; 1011 } else { 1012 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1013 if (error) 1014 goto out_ipres; 1015 } 1016 1017 error = gfs2_meta_inode_buffer(ip, &dibh); 1018 if (error) 1019 goto out_end_trans; 1020 1021 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1022 if (error) 1023 goto out_brelse; 1024 1025 gfs2_trans_add_meta(ip->i_gl, dibh); 1026 inc_nlink(&ip->i_inode); 1027 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1028 ihold(inode); 1029 d_instantiate(dentry, inode); 1030 mark_inode_dirty(inode); 1031 1032 out_brelse: 1033 brelse(dibh); 1034 out_end_trans: 1035 gfs2_trans_end(sdp); 1036 out_ipres: 1037 if (da.nr_blocks) 1038 gfs2_inplace_release(dip); 1039 out_gunlock_q: 1040 if (da.nr_blocks) 1041 gfs2_quota_unlock(dip); 1042 out_gunlock: 1043 gfs2_dir_no_add(&da); 1044 gfs2_glock_dq(ghs + 1); 1045 out_child: 1046 gfs2_glock_dq(ghs); 1047 out_parent: 1048 gfs2_qa_put(dip); 1049 gfs2_holder_uninit(ghs); 1050 gfs2_holder_uninit(ghs + 1); 1051 return error; 1052 } 1053 1054 /* 1055 * gfs2_unlink_ok - check to see that a inode is still in a directory 1056 * @dip: the directory 1057 * @name: the name of the file 1058 * @ip: the inode 1059 * 1060 * Assumes that the lock on (at least) @dip is held. 1061 * 1062 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1063 */ 1064 1065 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1066 const struct gfs2_inode *ip) 1067 { 1068 int error; 1069 1070 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1071 return -EPERM; 1072 1073 if ((dip->i_inode.i_mode & S_ISVTX) && 1074 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1075 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1076 return -EPERM; 1077 1078 if (IS_APPEND(&dip->i_inode)) 1079 return -EPERM; 1080 1081 error = gfs2_permission(&init_user_ns, &dip->i_inode, 1082 MAY_WRITE | MAY_EXEC); 1083 if (error) 1084 return error; 1085 1086 return gfs2_dir_check(&dip->i_inode, name, ip); 1087 } 1088 1089 /** 1090 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1091 * @dip: The parent directory 1092 * @dentry: The dentry to unlink 1093 * 1094 * Called with all the locks and in a transaction. This will only be 1095 * called for a directory after it has been checked to ensure it is empty. 1096 * 1097 * Returns: 0 on success, or an error 1098 */ 1099 1100 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1101 const struct dentry *dentry) 1102 { 1103 struct inode *inode = d_inode(dentry); 1104 struct gfs2_inode *ip = GFS2_I(inode); 1105 int error; 1106 1107 error = gfs2_dir_del(dip, dentry); 1108 if (error) 1109 return error; 1110 1111 ip->i_entries = 0; 1112 inode->i_ctime = current_time(inode); 1113 if (S_ISDIR(inode->i_mode)) 1114 clear_nlink(inode); 1115 else 1116 drop_nlink(inode); 1117 mark_inode_dirty(inode); 1118 if (inode->i_nlink == 0) 1119 gfs2_unlink_di(inode); 1120 return 0; 1121 } 1122 1123 1124 /** 1125 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1126 * @dir: The inode of the directory containing the inode to unlink 1127 * @dentry: The file itself 1128 * 1129 * This routine uses the type of the inode as a flag to figure out 1130 * whether this is an unlink or an rmdir. 1131 * 1132 * Returns: errno 1133 */ 1134 1135 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1136 { 1137 struct gfs2_inode *dip = GFS2_I(dir); 1138 struct gfs2_sbd *sdp = GFS2_SB(dir); 1139 struct inode *inode = d_inode(dentry); 1140 struct gfs2_inode *ip = GFS2_I(inode); 1141 struct gfs2_holder ghs[3]; 1142 struct gfs2_rgrpd *rgd; 1143 int error; 1144 1145 error = gfs2_rindex_update(sdp); 1146 if (error) 1147 return error; 1148 1149 error = -EROFS; 1150 1151 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1152 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1153 1154 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1155 if (!rgd) 1156 goto out_inodes; 1157 1158 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2); 1159 1160 1161 error = gfs2_glock_nq(ghs); /* parent */ 1162 if (error) 1163 goto out_parent; 1164 1165 error = gfs2_glock_nq(ghs + 1); /* child */ 1166 if (error) 1167 goto out_child; 1168 1169 error = -ENOENT; 1170 if (inode->i_nlink == 0) 1171 goto out_rgrp; 1172 1173 if (S_ISDIR(inode->i_mode)) { 1174 error = -ENOTEMPTY; 1175 if (ip->i_entries > 2 || inode->i_nlink > 2) 1176 goto out_rgrp; 1177 } 1178 1179 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1180 if (error) 1181 goto out_rgrp; 1182 1183 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1184 if (error) 1185 goto out_gunlock; 1186 1187 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1188 if (error) 1189 goto out_gunlock; 1190 1191 error = gfs2_unlink_inode(dip, dentry); 1192 gfs2_trans_end(sdp); 1193 1194 out_gunlock: 1195 gfs2_glock_dq(ghs + 2); 1196 out_rgrp: 1197 gfs2_glock_dq(ghs + 1); 1198 out_child: 1199 gfs2_glock_dq(ghs); 1200 out_parent: 1201 gfs2_holder_uninit(ghs + 2); 1202 out_inodes: 1203 gfs2_holder_uninit(ghs + 1); 1204 gfs2_holder_uninit(ghs); 1205 return error; 1206 } 1207 1208 /** 1209 * gfs2_symlink - Create a symlink 1210 * @mnt_userns: User namespace of the mount the inode was found from 1211 * @dir: The directory to create the symlink in 1212 * @dentry: The dentry to put the symlink in 1213 * @symname: The thing which the link points to 1214 * 1215 * Returns: errno 1216 */ 1217 1218 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1219 struct dentry *dentry, const char *symname) 1220 { 1221 unsigned int size; 1222 1223 size = strlen(symname); 1224 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1225 return -ENAMETOOLONG; 1226 1227 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1228 } 1229 1230 /** 1231 * gfs2_mkdir - Make a directory 1232 * @mnt_userns: User namespace of the mount the inode was found from 1233 * @dir: The parent directory of the new one 1234 * @dentry: The dentry of the new directory 1235 * @mode: The mode of the new directory 1236 * 1237 * Returns: errno 1238 */ 1239 1240 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1241 struct dentry *dentry, umode_t mode) 1242 { 1243 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1244 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1245 } 1246 1247 /** 1248 * gfs2_mknod - Make a special file 1249 * @mnt_userns: User namespace of the mount the inode was found from 1250 * @dir: The directory in which the special file will reside 1251 * @dentry: The dentry of the special file 1252 * @mode: The mode of the special file 1253 * @dev: The device specification of the special file 1254 * 1255 */ 1256 1257 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1258 struct dentry *dentry, umode_t mode, dev_t dev) 1259 { 1260 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1261 } 1262 1263 /** 1264 * gfs2_atomic_open - Atomically open a file 1265 * @dir: The directory 1266 * @dentry: The proposed new entry 1267 * @file: The proposed new struct file 1268 * @flags: open flags 1269 * @mode: File mode 1270 * 1271 * Returns: error code or 0 for success 1272 */ 1273 1274 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1275 struct file *file, unsigned flags, 1276 umode_t mode) 1277 { 1278 struct dentry *d; 1279 bool excl = !!(flags & O_EXCL); 1280 1281 if (!d_in_lookup(dentry)) 1282 goto skip_lookup; 1283 1284 d = __gfs2_lookup(dir, dentry, file); 1285 if (IS_ERR(d)) 1286 return PTR_ERR(d); 1287 if (d != NULL) 1288 dentry = d; 1289 if (d_really_is_positive(dentry)) { 1290 if (!(file->f_mode & FMODE_OPENED)) 1291 return finish_no_open(file, d); 1292 dput(d); 1293 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1294 } 1295 1296 BUG_ON(d != NULL); 1297 1298 skip_lookup: 1299 if (!(flags & O_CREAT)) 1300 return -ENOENT; 1301 1302 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1303 } 1304 1305 /* 1306 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1307 * @this: move this 1308 * @to: to here 1309 * 1310 * Follow @to back to the root and make sure we don't encounter @this 1311 * Assumes we already hold the rename lock. 1312 * 1313 * Returns: errno 1314 */ 1315 1316 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1317 { 1318 struct inode *dir = &to->i_inode; 1319 struct super_block *sb = dir->i_sb; 1320 struct inode *tmp; 1321 int error = 0; 1322 1323 igrab(dir); 1324 1325 for (;;) { 1326 if (dir == &this->i_inode) { 1327 error = -EINVAL; 1328 break; 1329 } 1330 if (dir == d_inode(sb->s_root)) { 1331 error = 0; 1332 break; 1333 } 1334 1335 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1336 if (!tmp) { 1337 error = -ENOENT; 1338 break; 1339 } 1340 if (IS_ERR(tmp)) { 1341 error = PTR_ERR(tmp); 1342 break; 1343 } 1344 1345 iput(dir); 1346 dir = tmp; 1347 } 1348 1349 iput(dir); 1350 1351 return error; 1352 } 1353 1354 /** 1355 * update_moved_ino - Update an inode that's being moved 1356 * @ip: The inode being moved 1357 * @ndip: The parent directory of the new filename 1358 * @dir_rename: True of ip is a directory 1359 * 1360 * Returns: errno 1361 */ 1362 1363 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1364 int dir_rename) 1365 { 1366 if (dir_rename) 1367 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1368 1369 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1370 mark_inode_dirty_sync(&ip->i_inode); 1371 return 0; 1372 } 1373 1374 1375 /** 1376 * gfs2_rename - Rename a file 1377 * @odir: Parent directory of old file name 1378 * @odentry: The old dentry of the file 1379 * @ndir: Parent directory of new file name 1380 * @ndentry: The new dentry of the file 1381 * 1382 * Returns: errno 1383 */ 1384 1385 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1386 struct inode *ndir, struct dentry *ndentry) 1387 { 1388 struct gfs2_inode *odip = GFS2_I(odir); 1389 struct gfs2_inode *ndip = GFS2_I(ndir); 1390 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1391 struct gfs2_inode *nip = NULL; 1392 struct gfs2_sbd *sdp = GFS2_SB(odir); 1393 struct gfs2_holder ghs[4], r_gh, rd_gh; 1394 struct gfs2_rgrpd *nrgd; 1395 unsigned int num_gh; 1396 int dir_rename = 0; 1397 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1398 unsigned int x; 1399 int error; 1400 1401 gfs2_holder_mark_uninitialized(&r_gh); 1402 gfs2_holder_mark_uninitialized(&rd_gh); 1403 if (d_really_is_positive(ndentry)) { 1404 nip = GFS2_I(d_inode(ndentry)); 1405 if (ip == nip) 1406 return 0; 1407 } 1408 1409 error = gfs2_rindex_update(sdp); 1410 if (error) 1411 return error; 1412 1413 error = gfs2_qa_get(ndip); 1414 if (error) 1415 return error; 1416 1417 if (odip != ndip) { 1418 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1419 0, &r_gh); 1420 if (error) 1421 goto out; 1422 1423 if (S_ISDIR(ip->i_inode.i_mode)) { 1424 dir_rename = 1; 1425 /* don't move a directory into its subdir */ 1426 error = gfs2_ok_to_move(ip, ndip); 1427 if (error) 1428 goto out_gunlock_r; 1429 } 1430 } 1431 1432 num_gh = 1; 1433 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1434 if (odip != ndip) { 1435 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1436 ghs + num_gh); 1437 num_gh++; 1438 } 1439 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1440 num_gh++; 1441 1442 if (nip) { 1443 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1444 ghs + num_gh); 1445 num_gh++; 1446 } 1447 1448 for (x = 0; x < num_gh; x++) { 1449 error = gfs2_glock_nq(ghs + x); 1450 if (error) 1451 goto out_gunlock; 1452 } 1453 error = gfs2_glock_async_wait(num_gh, ghs); 1454 if (error) 1455 goto out_gunlock; 1456 1457 if (nip) { 1458 /* Grab the resource group glock for unlink flag twiddling. 1459 * This is the case where the target dinode already exists 1460 * so we unlink before doing the rename. 1461 */ 1462 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1463 if (!nrgd) { 1464 error = -ENOENT; 1465 goto out_gunlock; 1466 } 1467 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1468 LM_FLAG_NODE_SCOPE, &rd_gh); 1469 if (error) 1470 goto out_gunlock; 1471 } 1472 1473 error = -ENOENT; 1474 if (ip->i_inode.i_nlink == 0) 1475 goto out_gunlock; 1476 1477 /* Check out the old directory */ 1478 1479 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1480 if (error) 1481 goto out_gunlock; 1482 1483 /* Check out the new directory */ 1484 1485 if (nip) { 1486 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1487 if (error) 1488 goto out_gunlock; 1489 1490 if (nip->i_inode.i_nlink == 0) { 1491 error = -EAGAIN; 1492 goto out_gunlock; 1493 } 1494 1495 if (S_ISDIR(nip->i_inode.i_mode)) { 1496 if (nip->i_entries < 2) { 1497 gfs2_consist_inode(nip); 1498 error = -EIO; 1499 goto out_gunlock; 1500 } 1501 if (nip->i_entries > 2) { 1502 error = -ENOTEMPTY; 1503 goto out_gunlock; 1504 } 1505 } 1506 } else { 1507 error = gfs2_permission(&init_user_ns, ndir, 1508 MAY_WRITE | MAY_EXEC); 1509 if (error) 1510 goto out_gunlock; 1511 1512 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1513 switch (error) { 1514 case -ENOENT: 1515 error = 0; 1516 break; 1517 case 0: 1518 error = -EEXIST; 1519 goto out_gunlock; 1520 default: 1521 goto out_gunlock; 1522 } 1523 1524 if (odip != ndip) { 1525 if (!ndip->i_inode.i_nlink) { 1526 error = -ENOENT; 1527 goto out_gunlock; 1528 } 1529 if (ndip->i_entries == (u32)-1) { 1530 error = -EFBIG; 1531 goto out_gunlock; 1532 } 1533 if (S_ISDIR(ip->i_inode.i_mode) && 1534 ndip->i_inode.i_nlink == (u32)-1) { 1535 error = -EMLINK; 1536 goto out_gunlock; 1537 } 1538 } 1539 } 1540 1541 /* Check out the dir to be renamed */ 1542 1543 if (dir_rename) { 1544 error = gfs2_permission(&init_user_ns, d_inode(odentry), 1545 MAY_WRITE); 1546 if (error) 1547 goto out_gunlock; 1548 } 1549 1550 if (nip == NULL) { 1551 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1552 if (error) 1553 goto out_gunlock; 1554 } 1555 1556 if (da.nr_blocks) { 1557 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1558 error = gfs2_quota_lock_check(ndip, &ap); 1559 if (error) 1560 goto out_gunlock; 1561 1562 error = gfs2_inplace_reserve(ndip, &ap); 1563 if (error) 1564 goto out_gunlock_q; 1565 1566 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1567 4 * RES_LEAF + 4, 0); 1568 if (error) 1569 goto out_ipreserv; 1570 } else { 1571 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1572 5 * RES_LEAF + 4, 0); 1573 if (error) 1574 goto out_gunlock; 1575 } 1576 1577 /* Remove the target file, if it exists */ 1578 1579 if (nip) 1580 error = gfs2_unlink_inode(ndip, ndentry); 1581 1582 error = update_moved_ino(ip, ndip, dir_rename); 1583 if (error) 1584 goto out_end_trans; 1585 1586 error = gfs2_dir_del(odip, odentry); 1587 if (error) 1588 goto out_end_trans; 1589 1590 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1591 if (error) 1592 goto out_end_trans; 1593 1594 out_end_trans: 1595 gfs2_trans_end(sdp); 1596 out_ipreserv: 1597 if (da.nr_blocks) 1598 gfs2_inplace_release(ndip); 1599 out_gunlock_q: 1600 if (da.nr_blocks) 1601 gfs2_quota_unlock(ndip); 1602 out_gunlock: 1603 gfs2_dir_no_add(&da); 1604 if (gfs2_holder_initialized(&rd_gh)) 1605 gfs2_glock_dq_uninit(&rd_gh); 1606 1607 while (x--) { 1608 if (gfs2_holder_queued(ghs + x)) 1609 gfs2_glock_dq(ghs + x); 1610 gfs2_holder_uninit(ghs + x); 1611 } 1612 out_gunlock_r: 1613 if (gfs2_holder_initialized(&r_gh)) 1614 gfs2_glock_dq_uninit(&r_gh); 1615 out: 1616 gfs2_qa_put(ndip); 1617 return error; 1618 } 1619 1620 /** 1621 * gfs2_exchange - exchange two files 1622 * @odir: Parent directory of old file name 1623 * @odentry: The old dentry of the file 1624 * @ndir: Parent directory of new file name 1625 * @ndentry: The new dentry of the file 1626 * @flags: The rename flags 1627 * 1628 * Returns: errno 1629 */ 1630 1631 static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1632 struct inode *ndir, struct dentry *ndentry, 1633 unsigned int flags) 1634 { 1635 struct gfs2_inode *odip = GFS2_I(odir); 1636 struct gfs2_inode *ndip = GFS2_I(ndir); 1637 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1638 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1639 struct gfs2_sbd *sdp = GFS2_SB(odir); 1640 struct gfs2_holder ghs[4], r_gh; 1641 unsigned int num_gh; 1642 unsigned int x; 1643 umode_t old_mode = oip->i_inode.i_mode; 1644 umode_t new_mode = nip->i_inode.i_mode; 1645 int error; 1646 1647 gfs2_holder_mark_uninitialized(&r_gh); 1648 error = gfs2_rindex_update(sdp); 1649 if (error) 1650 return error; 1651 1652 if (odip != ndip) { 1653 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1654 0, &r_gh); 1655 if (error) 1656 goto out; 1657 1658 if (S_ISDIR(old_mode)) { 1659 /* don't move a directory into its subdir */ 1660 error = gfs2_ok_to_move(oip, ndip); 1661 if (error) 1662 goto out_gunlock_r; 1663 } 1664 1665 if (S_ISDIR(new_mode)) { 1666 /* don't move a directory into its subdir */ 1667 error = gfs2_ok_to_move(nip, odip); 1668 if (error) 1669 goto out_gunlock_r; 1670 } 1671 } 1672 1673 num_gh = 1; 1674 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1675 if (odip != ndip) { 1676 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1677 ghs + num_gh); 1678 num_gh++; 1679 } 1680 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1681 num_gh++; 1682 1683 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1684 num_gh++; 1685 1686 for (x = 0; x < num_gh; x++) { 1687 error = gfs2_glock_nq(ghs + x); 1688 if (error) 1689 goto out_gunlock; 1690 } 1691 1692 error = gfs2_glock_async_wait(num_gh, ghs); 1693 if (error) 1694 goto out_gunlock; 1695 1696 error = -ENOENT; 1697 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1698 goto out_gunlock; 1699 1700 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1701 if (error) 1702 goto out_gunlock; 1703 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1704 if (error) 1705 goto out_gunlock; 1706 1707 if (S_ISDIR(old_mode)) { 1708 error = gfs2_permission(&init_user_ns, odentry->d_inode, 1709 MAY_WRITE); 1710 if (error) 1711 goto out_gunlock; 1712 } 1713 if (S_ISDIR(new_mode)) { 1714 error = gfs2_permission(&init_user_ns, ndentry->d_inode, 1715 MAY_WRITE); 1716 if (error) 1717 goto out_gunlock; 1718 } 1719 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1720 if (error) 1721 goto out_gunlock; 1722 1723 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1724 if (error) 1725 goto out_end_trans; 1726 1727 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1728 if (error) 1729 goto out_end_trans; 1730 1731 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1732 IF2DT(old_mode)); 1733 if (error) 1734 goto out_end_trans; 1735 1736 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1737 IF2DT(new_mode)); 1738 if (error) 1739 goto out_end_trans; 1740 1741 if (odip != ndip) { 1742 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1743 inc_nlink(&odip->i_inode); 1744 drop_nlink(&ndip->i_inode); 1745 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1746 inc_nlink(&ndip->i_inode); 1747 drop_nlink(&odip->i_inode); 1748 } 1749 } 1750 mark_inode_dirty(&ndip->i_inode); 1751 if (odip != ndip) 1752 mark_inode_dirty(&odip->i_inode); 1753 1754 out_end_trans: 1755 gfs2_trans_end(sdp); 1756 out_gunlock: 1757 while (x--) { 1758 if (gfs2_holder_queued(ghs + x)) 1759 gfs2_glock_dq(ghs + x); 1760 gfs2_holder_uninit(ghs + x); 1761 } 1762 out_gunlock_r: 1763 if (gfs2_holder_initialized(&r_gh)) 1764 gfs2_glock_dq_uninit(&r_gh); 1765 out: 1766 return error; 1767 } 1768 1769 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, 1770 struct dentry *odentry, struct inode *ndir, 1771 struct dentry *ndentry, unsigned int flags) 1772 { 1773 flags &= ~RENAME_NOREPLACE; 1774 1775 if (flags & ~RENAME_EXCHANGE) 1776 return -EINVAL; 1777 1778 if (flags & RENAME_EXCHANGE) 1779 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1780 1781 return gfs2_rename(odir, odentry, ndir, ndentry); 1782 } 1783 1784 /** 1785 * gfs2_get_link - Follow a symbolic link 1786 * @dentry: The dentry of the link 1787 * @inode: The inode of the link 1788 * @done: destructor for return value 1789 * 1790 * This can handle symlinks of any size. 1791 * 1792 * Returns: 0 on success or error code 1793 */ 1794 1795 static const char *gfs2_get_link(struct dentry *dentry, 1796 struct inode *inode, 1797 struct delayed_call *done) 1798 { 1799 struct gfs2_inode *ip = GFS2_I(inode); 1800 struct gfs2_holder i_gh; 1801 struct buffer_head *dibh; 1802 unsigned int size; 1803 char *buf; 1804 int error; 1805 1806 if (!dentry) 1807 return ERR_PTR(-ECHILD); 1808 1809 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1810 error = gfs2_glock_nq(&i_gh); 1811 if (error) { 1812 gfs2_holder_uninit(&i_gh); 1813 return ERR_PTR(error); 1814 } 1815 1816 size = (unsigned int)i_size_read(&ip->i_inode); 1817 if (size == 0) { 1818 gfs2_consist_inode(ip); 1819 buf = ERR_PTR(-EIO); 1820 goto out; 1821 } 1822 1823 error = gfs2_meta_inode_buffer(ip, &dibh); 1824 if (error) { 1825 buf = ERR_PTR(error); 1826 goto out; 1827 } 1828 1829 buf = kzalloc(size + 1, GFP_NOFS); 1830 if (!buf) 1831 buf = ERR_PTR(-ENOMEM); 1832 else 1833 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1834 brelse(dibh); 1835 out: 1836 gfs2_glock_dq_uninit(&i_gh); 1837 if (!IS_ERR(buf)) 1838 set_delayed_call(done, kfree_link, buf); 1839 return buf; 1840 } 1841 1842 /** 1843 * gfs2_permission 1844 * @mnt_userns: User namespace of the mount the inode was found from 1845 * @inode: The inode 1846 * @mask: The mask to be tested 1847 * 1848 * This may be called from the VFS directly, or from within GFS2 with the 1849 * inode locked, so we look to see if the glock is already locked and only 1850 * lock the glock if its not already been done. 1851 * 1852 * Returns: errno 1853 */ 1854 1855 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode, 1856 int mask) 1857 { 1858 struct gfs2_inode *ip; 1859 struct gfs2_holder i_gh; 1860 int error; 1861 1862 gfs2_holder_mark_uninitialized(&i_gh); 1863 ip = GFS2_I(inode); 1864 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1865 if (mask & MAY_NOT_BLOCK) 1866 return -ECHILD; 1867 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1868 if (error) 1869 return error; 1870 } 1871 1872 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1873 error = -EPERM; 1874 else 1875 error = generic_permission(&init_user_ns, inode, mask); 1876 if (gfs2_holder_initialized(&i_gh)) 1877 gfs2_glock_dq_uninit(&i_gh); 1878 1879 return error; 1880 } 1881 1882 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1883 { 1884 setattr_copy(&init_user_ns, inode, attr); 1885 mark_inode_dirty(inode); 1886 return 0; 1887 } 1888 1889 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1890 { 1891 int error; 1892 1893 if (current->journal_info) 1894 return __gfs2_setattr_simple(inode, attr); 1895 1896 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1897 if (error) 1898 return error; 1899 1900 error = __gfs2_setattr_simple(inode, attr); 1901 gfs2_trans_end(GFS2_SB(inode)); 1902 return error; 1903 } 1904 1905 static int setattr_chown(struct inode *inode, struct iattr *attr) 1906 { 1907 struct gfs2_inode *ip = GFS2_I(inode); 1908 struct gfs2_sbd *sdp = GFS2_SB(inode); 1909 kuid_t ouid, nuid; 1910 kgid_t ogid, ngid; 1911 int error; 1912 struct gfs2_alloc_parms ap; 1913 1914 ouid = inode->i_uid; 1915 ogid = inode->i_gid; 1916 nuid = attr->ia_uid; 1917 ngid = attr->ia_gid; 1918 1919 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1920 ouid = nuid = NO_UID_QUOTA_CHANGE; 1921 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1922 ogid = ngid = NO_GID_QUOTA_CHANGE; 1923 error = gfs2_qa_get(ip); 1924 if (error) 1925 return error; 1926 1927 error = gfs2_rindex_update(sdp); 1928 if (error) 1929 goto out; 1930 1931 error = gfs2_quota_lock(ip, nuid, ngid); 1932 if (error) 1933 goto out; 1934 1935 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1936 1937 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1938 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1939 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1940 if (error) 1941 goto out_gunlock_q; 1942 } 1943 1944 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1945 if (error) 1946 goto out_gunlock_q; 1947 1948 error = gfs2_setattr_simple(inode, attr); 1949 if (error) 1950 goto out_end_trans; 1951 1952 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1953 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1954 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1955 gfs2_quota_change(ip, ap.target, nuid, ngid); 1956 } 1957 1958 out_end_trans: 1959 gfs2_trans_end(sdp); 1960 out_gunlock_q: 1961 gfs2_quota_unlock(ip); 1962 out: 1963 gfs2_qa_put(ip); 1964 return error; 1965 } 1966 1967 /** 1968 * gfs2_setattr - Change attributes on an inode 1969 * @mnt_userns: User namespace of the mount the inode was found from 1970 * @dentry: The dentry which is changing 1971 * @attr: The structure describing the change 1972 * 1973 * The VFS layer wants to change one or more of an inodes attributes. Write 1974 * that change out to disk. 1975 * 1976 * Returns: errno 1977 */ 1978 1979 static int gfs2_setattr(struct user_namespace *mnt_userns, 1980 struct dentry *dentry, struct iattr *attr) 1981 { 1982 struct inode *inode = d_inode(dentry); 1983 struct gfs2_inode *ip = GFS2_I(inode); 1984 struct gfs2_holder i_gh; 1985 int error; 1986 1987 error = gfs2_qa_get(ip); 1988 if (error) 1989 return error; 1990 1991 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1992 if (error) 1993 goto out; 1994 1995 error = may_setattr(&init_user_ns, inode, attr->ia_valid); 1996 if (error) 1997 goto error; 1998 1999 error = setattr_prepare(&init_user_ns, dentry, attr); 2000 if (error) 2001 goto error; 2002 2003 if (attr->ia_valid & ATTR_SIZE) 2004 error = gfs2_setattr_size(inode, attr->ia_size); 2005 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2006 error = setattr_chown(inode, attr); 2007 else { 2008 error = gfs2_setattr_simple(inode, attr); 2009 if (!error && attr->ia_valid & ATTR_MODE) 2010 error = posix_acl_chmod(&init_user_ns, dentry, 2011 inode->i_mode); 2012 } 2013 2014 error: 2015 if (!error) 2016 mark_inode_dirty(inode); 2017 gfs2_glock_dq_uninit(&i_gh); 2018 out: 2019 gfs2_qa_put(ip); 2020 return error; 2021 } 2022 2023 /** 2024 * gfs2_getattr - Read out an inode's attributes 2025 * @mnt_userns: user namespace of the mount the inode was found from 2026 * @path: Object to query 2027 * @stat: The inode's stats 2028 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2029 * @flags: AT_STATX_xxx setting 2030 * 2031 * This may be called from the VFS directly, or from within GFS2 with the 2032 * inode locked, so we look to see if the glock is already locked and only 2033 * lock the glock if its not already been done. Note that its the NFS 2034 * readdirplus operation which causes this to be called (from filldir) 2035 * with the glock already held. 2036 * 2037 * Returns: errno 2038 */ 2039 2040 static int gfs2_getattr(struct user_namespace *mnt_userns, 2041 const struct path *path, struct kstat *stat, 2042 u32 request_mask, unsigned int flags) 2043 { 2044 struct inode *inode = d_inode(path->dentry); 2045 struct gfs2_inode *ip = GFS2_I(inode); 2046 struct gfs2_holder gh; 2047 u32 gfsflags; 2048 int error; 2049 2050 gfs2_holder_mark_uninitialized(&gh); 2051 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2052 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2053 if (error) 2054 return error; 2055 } 2056 2057 gfsflags = ip->i_diskflags; 2058 if (gfsflags & GFS2_DIF_APPENDONLY) 2059 stat->attributes |= STATX_ATTR_APPEND; 2060 if (gfsflags & GFS2_DIF_IMMUTABLE) 2061 stat->attributes |= STATX_ATTR_IMMUTABLE; 2062 2063 stat->attributes_mask |= (STATX_ATTR_APPEND | 2064 STATX_ATTR_COMPRESSED | 2065 STATX_ATTR_ENCRYPTED | 2066 STATX_ATTR_IMMUTABLE | 2067 STATX_ATTR_NODUMP); 2068 2069 generic_fillattr(&init_user_ns, inode, stat); 2070 2071 if (gfs2_holder_initialized(&gh)) 2072 gfs2_glock_dq_uninit(&gh); 2073 2074 return 0; 2075 } 2076 2077 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2078 u64 start, u64 len) 2079 { 2080 struct gfs2_inode *ip = GFS2_I(inode); 2081 struct gfs2_holder gh; 2082 int ret; 2083 2084 inode_lock_shared(inode); 2085 2086 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2087 if (ret) 2088 goto out; 2089 2090 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2091 2092 gfs2_glock_dq_uninit(&gh); 2093 2094 out: 2095 inode_unlock_shared(inode); 2096 return ret; 2097 } 2098 2099 loff_t gfs2_seek_data(struct file *file, loff_t offset) 2100 { 2101 struct inode *inode = file->f_mapping->host; 2102 struct gfs2_inode *ip = GFS2_I(inode); 2103 struct gfs2_holder gh; 2104 loff_t ret; 2105 2106 inode_lock_shared(inode); 2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2108 if (!ret) 2109 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2110 gfs2_glock_dq_uninit(&gh); 2111 inode_unlock_shared(inode); 2112 2113 if (ret < 0) 2114 return ret; 2115 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2116 } 2117 2118 loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2119 { 2120 struct inode *inode = file->f_mapping->host; 2121 struct gfs2_inode *ip = GFS2_I(inode); 2122 struct gfs2_holder gh; 2123 loff_t ret; 2124 2125 inode_lock_shared(inode); 2126 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2127 if (!ret) 2128 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2129 gfs2_glock_dq_uninit(&gh); 2130 inode_unlock_shared(inode); 2131 2132 if (ret < 0) 2133 return ret; 2134 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2135 } 2136 2137 static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2138 int flags) 2139 { 2140 struct gfs2_inode *ip = GFS2_I(inode); 2141 struct gfs2_glock *gl = ip->i_gl; 2142 struct gfs2_holder *gh; 2143 int error; 2144 2145 gh = gfs2_glock_is_locked_by_me(gl); 2146 if (gh && !gfs2_glock_is_held_excl(gl)) { 2147 gfs2_glock_dq(gh); 2148 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2149 error = gfs2_glock_nq(gh); 2150 if (error) 2151 return error; 2152 } 2153 return generic_update_time(inode, time, flags); 2154 } 2155 2156 static const struct inode_operations gfs2_file_iops = { 2157 .permission = gfs2_permission, 2158 .setattr = gfs2_setattr, 2159 .getattr = gfs2_getattr, 2160 .listxattr = gfs2_listxattr, 2161 .fiemap = gfs2_fiemap, 2162 .get_inode_acl = gfs2_get_acl, 2163 .set_acl = gfs2_set_acl, 2164 .update_time = gfs2_update_time, 2165 .fileattr_get = gfs2_fileattr_get, 2166 .fileattr_set = gfs2_fileattr_set, 2167 }; 2168 2169 static const struct inode_operations gfs2_dir_iops = { 2170 .create = gfs2_create, 2171 .lookup = gfs2_lookup, 2172 .link = gfs2_link, 2173 .unlink = gfs2_unlink, 2174 .symlink = gfs2_symlink, 2175 .mkdir = gfs2_mkdir, 2176 .rmdir = gfs2_unlink, 2177 .mknod = gfs2_mknod, 2178 .rename = gfs2_rename2, 2179 .permission = gfs2_permission, 2180 .setattr = gfs2_setattr, 2181 .getattr = gfs2_getattr, 2182 .listxattr = gfs2_listxattr, 2183 .fiemap = gfs2_fiemap, 2184 .get_inode_acl = gfs2_get_acl, 2185 .set_acl = gfs2_set_acl, 2186 .update_time = gfs2_update_time, 2187 .atomic_open = gfs2_atomic_open, 2188 .fileattr_get = gfs2_fileattr_get, 2189 .fileattr_set = gfs2_fileattr_set, 2190 }; 2191 2192 static const struct inode_operations gfs2_symlink_iops = { 2193 .get_link = gfs2_get_link, 2194 .permission = gfs2_permission, 2195 .setattr = gfs2_setattr, 2196 .getattr = gfs2_getattr, 2197 .listxattr = gfs2_listxattr, 2198 .fiemap = gfs2_fiemap, 2199 }; 2200 2201