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 39static const struct inode_operations gfs2_file_iops; 40static const struct inode_operations gfs2_dir_iops; 41static 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 51static 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 76static 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 83static 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 114struct 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 221fail: 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 if (ip->i_gl) { 229 gfs2_glock_put(ip->i_gl); 230 ip->i_gl = NULL; 231 } 232 iget_failed(inode); 233 return ERR_PTR(error); 234} 235 236/** 237 * gfs2_lookup_by_inum - look up an inode by inode number 238 * @sdp: The super block 239 * @no_addr: The inode number 240 * @no_formal_ino: The inode generation number (0 for any) 241 * @blktype: Requested block type (see gfs2_inode_lookup) 242 */ 243struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 244 u64 no_formal_ino, unsigned int blktype) 245{ 246 struct super_block *sb = sdp->sd_vfs; 247 struct inode *inode; 248 int error; 249 250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, 251 blktype); 252 if (IS_ERR(inode)) 253 return inode; 254 255 if (no_formal_ino) { 256 error = -EIO; 257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 258 goto fail_iput; 259 } 260 return inode; 261 262fail_iput: 263 iput(inode); 264 return ERR_PTR(error); 265} 266 267 268struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 269{ 270 struct qstr qstr; 271 struct inode *inode; 272 gfs2_str2qstr(&qstr, name); 273 inode = gfs2_lookupi(dip, &qstr, 1); 274 /* gfs2_lookupi has inconsistent callers: vfs 275 * related routines expect NULL for no entry found, 276 * gfs2_lookup_simple callers expect ENOENT 277 * and do not check for NULL. 278 */ 279 if (IS_ERR_OR_NULL(inode)) 280 return inode ? inode : ERR_PTR(-ENOENT); 281 282 /* 283 * Must not call back into the filesystem when allocating 284 * pages in the metadata inode's address space. 285 */ 286 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 287 288 return inode; 289} 290 291 292/** 293 * gfs2_lookupi - Look up a filename in a directory and return its inode 294 * @dir: The inode of the directory containing the inode to look-up 295 * @name: The name of the inode to look for 296 * @is_root: If 1, ignore the caller's permissions 297 * 298 * This can be called via the VFS filldir function when NFS is doing 299 * a readdirplus and the inode which its intending to stat isn't 300 * already in cache. In this case we must not take the directory glock 301 * again, since the readdir call will have already taken that lock. 302 * 303 * Returns: errno 304 */ 305 306struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 307 int is_root) 308{ 309 struct super_block *sb = dir->i_sb; 310 struct gfs2_inode *dip = GFS2_I(dir); 311 struct gfs2_holder d_gh; 312 int error = 0; 313 struct inode *inode = NULL; 314 315 gfs2_holder_mark_uninitialized(&d_gh); 316 if (!name->len || name->len > GFS2_FNAMESIZE) 317 return ERR_PTR(-ENAMETOOLONG); 318 319 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 320 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 321 dir == d_inode(sb->s_root))) { 322 igrab(dir); 323 return dir; 324 } 325 326 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 327 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 328 if (error) 329 return ERR_PTR(error); 330 } 331 332 if (!is_root) { 333 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC); 334 if (error) 335 goto out; 336 } 337 338 inode = gfs2_dir_search(dir, name, false); 339 if (IS_ERR(inode)) 340 error = PTR_ERR(inode); 341out: 342 if (gfs2_holder_initialized(&d_gh)) 343 gfs2_glock_dq_uninit(&d_gh); 344 if (error == -ENOENT) 345 return NULL; 346 return inode ? inode : ERR_PTR(error); 347} 348 349/** 350 * create_ok - OK to create a new on-disk inode here? 351 * @dip: Directory in which dinode is to be created 352 * @name: Name of new dinode 353 * @mode: 354 * 355 * Returns: errno 356 */ 357 358static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 359 umode_t mode) 360{ 361 int error; 362 363 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 364 MAY_WRITE | MAY_EXEC); 365 if (error) 366 return error; 367 368 /* Don't create entries in an unlinked directory */ 369 if (!dip->i_inode.i_nlink) 370 return -ENOENT; 371 372 if (dip->i_entries == (u32)-1) 373 return -EFBIG; 374 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 375 return -EMLINK; 376 377 return 0; 378} 379 380static void munge_mode_uid_gid(const struct gfs2_inode *dip, 381 struct inode *inode) 382{ 383 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 384 (dip->i_inode.i_mode & S_ISUID) && 385 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 386 if (S_ISDIR(inode->i_mode)) 387 inode->i_mode |= S_ISUID; 388 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 389 inode->i_mode &= ~07111; 390 inode->i_uid = dip->i_inode.i_uid; 391 } else 392 inode->i_uid = current_fsuid(); 393 394 if (dip->i_inode.i_mode & S_ISGID) { 395 if (S_ISDIR(inode->i_mode)) 396 inode->i_mode |= S_ISGID; 397 inode->i_gid = dip->i_inode.i_gid; 398 } else 399 inode->i_gid = current_fsgid(); 400} 401 402static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 403{ 404 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 405 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 406 int error; 407 408 error = gfs2_quota_lock_check(ip, &ap); 409 if (error) 410 goto out; 411 412 error = gfs2_inplace_reserve(ip, &ap); 413 if (error) 414 goto out_quota; 415 416 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); 417 if (error) 418 goto out_ipreserv; 419 420 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); 421 if (error) 422 goto out_trans_end; 423 424 ip->i_no_formal_ino = ip->i_generation; 425 ip->i_inode.i_ino = ip->i_no_addr; 426 ip->i_goal = ip->i_no_addr; 427 if (*dblocks > 1) 428 ip->i_eattr = ip->i_no_addr + 1; 429 430out_trans_end: 431 gfs2_trans_end(sdp); 432out_ipreserv: 433 gfs2_inplace_release(ip); 434out_quota: 435 gfs2_quota_unlock(ip); 436out: 437 return error; 438} 439 440static void gfs2_init_dir(struct buffer_head *dibh, 441 const struct gfs2_inode *parent) 442{ 443 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 444 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 445 446 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 447 dent->de_inum = di->di_num; /* already GFS2 endian */ 448 dent->de_type = cpu_to_be16(DT_DIR); 449 450 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 451 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 452 gfs2_inum_out(parent, dent); 453 dent->de_type = cpu_to_be16(DT_DIR); 454 455} 456 457/** 458 * gfs2_init_xattr - Initialise an xattr block for a new inode 459 * @ip: The inode in question 460 * 461 * This sets up an empty xattr block for a new inode, ready to 462 * take any ACLs, LSM xattrs, etc. 463 */ 464 465static void gfs2_init_xattr(struct gfs2_inode *ip) 466{ 467 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 468 struct buffer_head *bh; 469 struct gfs2_ea_header *ea; 470 471 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 472 gfs2_trans_add_meta(ip->i_gl, bh); 473 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 474 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 475 476 ea = GFS2_EA_BH2FIRST(bh); 477 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 478 ea->ea_type = GFS2_EATYPE_UNUSED; 479 ea->ea_flags = GFS2_EAFLAG_LAST; 480 481 brelse(bh); 482} 483 484/** 485 * init_dinode - Fill in a new dinode structure 486 * @dip: The directory this inode is being created in 487 * @ip: The inode 488 * @symname: The symlink destination (if a symlink) 489 * 490 */ 491 492static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 493 const char *symname) 494{ 495 struct gfs2_dinode *di; 496 struct buffer_head *dibh; 497 498 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 499 gfs2_trans_add_meta(ip->i_gl, dibh); 500 di = (struct gfs2_dinode *)dibh->b_data; 501 gfs2_dinode_out(ip, di); 502 503 di->di_major = cpu_to_be32(imajor(&ip->i_inode)); 504 di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); 505 di->__pad1 = 0; 506 di->__pad2 = 0; 507 di->__pad3 = 0; 508 memset(&di->__pad4, 0, sizeof(di->__pad4)); 509 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 510 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 511 512 switch(ip->i_inode.i_mode & S_IFMT) { 513 case S_IFDIR: 514 gfs2_init_dir(dibh, dip); 515 break; 516 case S_IFLNK: 517 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 518 break; 519 } 520 521 set_buffer_uptodate(dibh); 522 brelse(dibh); 523} 524 525/** 526 * gfs2_trans_da_blks - Calculate number of blocks to link inode 527 * @dip: The directory we are linking into 528 * @da: The dir add information 529 * @nr_inodes: The number of inodes involved 530 * 531 * This calculate the number of blocks we need to reserve in a 532 * transaction to link @nr_inodes into a directory. In most cases 533 * @nr_inodes will be 2 (the directory plus the inode being linked in) 534 * but in case of rename, 4 may be required. 535 * 536 * Returns: Number of blocks 537 */ 538 539static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 540 const struct gfs2_diradd *da, 541 unsigned nr_inodes) 542{ 543 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 544 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 545} 546 547static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 548 struct gfs2_inode *ip, struct gfs2_diradd *da) 549{ 550 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 551 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 552 int error; 553 554 if (da->nr_blocks) { 555 error = gfs2_quota_lock_check(dip, &ap); 556 if (error) 557 goto fail_quota_locks; 558 559 error = gfs2_inplace_reserve(dip, &ap); 560 if (error) 561 goto fail_quota_locks; 562 563 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 564 if (error) 565 goto fail_ipreserv; 566 } else { 567 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 568 if (error) 569 goto fail_quota_locks; 570 } 571 572 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 573 574 gfs2_trans_end(sdp); 575fail_ipreserv: 576 gfs2_inplace_release(dip); 577fail_quota_locks: 578 gfs2_quota_unlock(dip); 579 return error; 580} 581 582static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 583 void *fs_info) 584{ 585 const struct xattr *xattr; 586 int err = 0; 587 588 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 589 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 590 xattr->value_len, 0, 591 GFS2_EATYPE_SECURITY); 592 if (err < 0) 593 break; 594 } 595 return err; 596} 597 598/** 599 * gfs2_create_inode - Create a new inode 600 * @dir: The parent directory 601 * @dentry: The new dentry 602 * @file: If non-NULL, the file which is being opened 603 * @mode: The permissions on the new inode 604 * @dev: For device nodes, this is the device number 605 * @symname: For symlinks, this is the link destination 606 * @size: The initial size of the inode (ignored for directories) 607 * @excl: Force fail if inode exists 608 * 609 * FIXME: Change to allocate the disk blocks and write them out in the same 610 * transaction. That way, we can no longer end up in a situation in which an 611 * inode is allocated, the node crashes, and the block looks like a valid 612 * inode. (With atomic creates in place, we will also no longer need to zero 613 * the link count and dirty the inode here on failure.) 614 * 615 * Returns: 0 on success, or error code 616 */ 617 618static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 619 struct file *file, 620 umode_t mode, dev_t dev, const char *symname, 621 unsigned int size, int excl) 622{ 623 const struct qstr *name = &dentry->d_name; 624 struct posix_acl *default_acl, *acl; 625 struct gfs2_holder d_gh, gh; 626 struct inode *inode = NULL; 627 struct gfs2_inode *dip = GFS2_I(dir), *ip; 628 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 629 struct gfs2_glock *io_gl; 630 int error; 631 u32 aflags = 0; 632 unsigned blocks = 1; 633 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 634 635 if (!name->len || name->len > GFS2_FNAMESIZE) 636 return -ENAMETOOLONG; 637 638 error = gfs2_qa_get(dip); 639 if (error) 640 return error; 641 642 error = gfs2_rindex_update(sdp); 643 if (error) 644 goto fail; 645 646 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 647 if (error) 648 goto fail; 649 gfs2_holder_mark_uninitialized(&gh); 650 651 error = create_ok(dip, name, mode); 652 if (error) 653 goto fail_gunlock; 654 655 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 656 error = PTR_ERR(inode); 657 if (!IS_ERR(inode)) { 658 if (S_ISDIR(inode->i_mode)) { 659 iput(inode); 660 inode = ERR_PTR(-EISDIR); 661 goto fail_gunlock; 662 } 663 d_instantiate(dentry, inode); 664 error = 0; 665 if (file) { 666 if (S_ISREG(inode->i_mode)) 667 error = finish_open(file, dentry, gfs2_open_common); 668 else 669 error = finish_no_open(file, NULL); 670 } 671 gfs2_glock_dq_uninit(&d_gh); 672 goto fail; 673 } else if (error != -ENOENT) { 674 goto fail_gunlock; 675 } 676 677 error = gfs2_diradd_alloc_required(dir, name, &da); 678 if (error < 0) 679 goto fail_gunlock; 680 681 inode = new_inode(sdp->sd_vfs); 682 error = -ENOMEM; 683 if (!inode) 684 goto fail_gunlock; 685 ip = GFS2_I(inode); 686 687 error = posix_acl_create(dir, &mode, &default_acl, &acl); 688 if (error) 689 goto fail_gunlock; 690 691 error = gfs2_qa_get(ip); 692 if (error) 693 goto fail_free_acls; 694 695 inode->i_mode = mode; 696 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 697 inode->i_rdev = dev; 698 inode->i_size = size; 699 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 700 munge_mode_uid_gid(dip, inode); 701 check_and_update_goal(dip); 702 ip->i_goal = dip->i_goal; 703 ip->i_diskflags = 0; 704 ip->i_eattr = 0; 705 ip->i_height = 0; 706 ip->i_depth = 0; 707 ip->i_entries = 0; 708 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 709 710 switch(mode & S_IFMT) { 711 case S_IFREG: 712 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 713 gfs2_tune_get(sdp, gt_new_files_jdata)) 714 ip->i_diskflags |= GFS2_DIF_JDATA; 715 gfs2_set_aops(inode); 716 break; 717 case S_IFDIR: 718 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 719 ip->i_diskflags |= GFS2_DIF_JDATA; 720 ip->i_entries = 2; 721 break; 722 } 723 724 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 725 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 726 ip->i_diskflags |= GFS2_DIF_SYSTEM; 727 728 gfs2_set_inode_flags(inode); 729 730 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 731 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 732 aflags |= GFS2_AF_ORLOV; 733 734 if (default_acl || acl) 735 blocks++; 736 737 error = alloc_dinode(ip, aflags, &blocks); 738 if (error) 739 goto fail_free_inode; 740 741 gfs2_set_inode_blocks(inode, blocks); 742 743 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 744 if (error) 745 goto fail_free_inode; 746 747 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 748 if (error) 749 goto fail_free_inode; 750 gfs2_cancel_delete_work(io_gl); 751 752retry: 753 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); 754 if (error == -EBUSY) 755 goto retry; 756 if (error) 757 goto fail_gunlock2; 758 759 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, 760 &ip->i_iopen_gh); 761 if (error) 762 goto fail_gunlock2; 763 764 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 765 if (error) 766 goto fail_gunlock3; 767 768 error = gfs2_trans_begin(sdp, blocks, 0); 769 if (error) 770 goto fail_gunlock3; 771 772 if (blocks > 1) 773 gfs2_init_xattr(ip); 774 init_dinode(dip, ip, symname); 775 gfs2_trans_end(sdp); 776 777 glock_set_object(ip->i_gl, ip); 778 glock_set_object(io_gl, ip); 779 gfs2_set_iop(inode); 780 781 if (default_acl) { 782 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 783 if (error) 784 goto fail_gunlock4; 785 posix_acl_release(default_acl); 786 default_acl = NULL; 787 } 788 if (acl) { 789 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 790 if (error) 791 goto fail_gunlock4; 792 posix_acl_release(acl); 793 acl = NULL; 794 } 795 796 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 797 &gfs2_initxattrs, NULL); 798 if (error) 799 goto fail_gunlock4; 800 801 error = link_dinode(dip, name, ip, &da); 802 if (error) 803 goto fail_gunlock4; 804 805 mark_inode_dirty(inode); 806 d_instantiate(dentry, inode); 807 /* After instantiate, errors should result in evict which will destroy 808 * both inode and iopen glocks properly. */ 809 if (file) { 810 file->f_mode |= FMODE_CREATED; 811 error = finish_open(file, dentry, gfs2_open_common); 812 } 813 gfs2_glock_dq_uninit(&d_gh); 814 gfs2_qa_put(ip); 815 gfs2_glock_dq_uninit(&gh); 816 gfs2_glock_put(io_gl); 817 gfs2_qa_put(dip); 818 unlock_new_inode(inode); 819 return error; 820 821fail_gunlock4: 822 glock_clear_object(ip->i_gl, ip); 823 glock_clear_object(io_gl, ip); 824fail_gunlock3: 825 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 826fail_gunlock2: 827 gfs2_glock_put(io_gl); 828fail_free_inode: 829 if (ip->i_gl) { 830 gfs2_glock_put(ip->i_gl); 831 ip->i_gl = NULL; 832 } 833 gfs2_rs_deltree(&ip->i_res); 834 gfs2_qa_put(ip); 835fail_free_acls: 836 posix_acl_release(default_acl); 837 posix_acl_release(acl); 838fail_gunlock: 839 gfs2_dir_no_add(&da); 840 gfs2_glock_dq_uninit(&d_gh); 841 if (!IS_ERR_OR_NULL(inode)) { 842 set_bit(GIF_ALLOC_FAILED, &ip->i_flags); 843 clear_nlink(inode); 844 if (ip->i_no_addr) 845 mark_inode_dirty(inode); 846 if (inode->i_state & I_NEW) 847 iget_failed(inode); 848 else 849 iput(inode); 850 } 851 if (gfs2_holder_initialized(&gh)) 852 gfs2_glock_dq_uninit(&gh); 853fail: 854 gfs2_qa_put(dip); 855 return error; 856} 857 858/** 859 * gfs2_create - Create a file 860 * @idmap: idmap of the mount the inode was found from 861 * @dir: The directory in which to create the file 862 * @dentry: The dentry of the new file 863 * @mode: The mode of the new file 864 * @excl: Force fail if inode exists 865 * 866 * Returns: errno 867 */ 868 869static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir, 870 struct dentry *dentry, umode_t mode, bool excl) 871{ 872 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 873} 874 875/** 876 * __gfs2_lookup - Look up a filename in a directory and return its inode 877 * @dir: The directory inode 878 * @dentry: The dentry of the new inode 879 * @file: File to be opened 880 * 881 * 882 * Returns: errno 883 */ 884 885static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 886 struct file *file) 887{ 888 struct inode *inode; 889 struct dentry *d; 890 struct gfs2_holder gh; 891 struct gfs2_glock *gl; 892 int error; 893 894 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 895 if (inode == NULL) { 896 d_add(dentry, NULL); 897 return NULL; 898 } 899 if (IS_ERR(inode)) 900 return ERR_CAST(inode); 901 902 gl = GFS2_I(inode)->i_gl; 903 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 904 if (error) { 905 iput(inode); 906 return ERR_PTR(error); 907 } 908 909 d = d_splice_alias(inode, dentry); 910 if (IS_ERR(d)) { 911 gfs2_glock_dq_uninit(&gh); 912 return d; 913 } 914 if (file && S_ISREG(inode->i_mode)) 915 error = finish_open(file, dentry, gfs2_open_common); 916 917 gfs2_glock_dq_uninit(&gh); 918 if (error) { 919 dput(d); 920 return ERR_PTR(error); 921 } 922 return d; 923} 924 925static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 926 unsigned flags) 927{ 928 return __gfs2_lookup(dir, dentry, NULL); 929} 930 931/** 932 * gfs2_link - Link to a file 933 * @old_dentry: The inode to link 934 * @dir: Add link to this directory 935 * @dentry: The name of the link 936 * 937 * Link the inode in "old_dentry" into the directory "dir" with the 938 * name in "dentry". 939 * 940 * Returns: errno 941 */ 942 943static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 944 struct dentry *dentry) 945{ 946 struct gfs2_inode *dip = GFS2_I(dir); 947 struct gfs2_sbd *sdp = GFS2_SB(dir); 948 struct inode *inode = d_inode(old_dentry); 949 struct gfs2_inode *ip = GFS2_I(inode); 950 struct gfs2_holder d_gh, gh; 951 struct buffer_head *dibh; 952 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 953 int error; 954 955 if (S_ISDIR(inode->i_mode)) 956 return -EPERM; 957 958 error = gfs2_qa_get(dip); 959 if (error) 960 return error; 961 962 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 963 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 964 965 error = gfs2_glock_nq(&d_gh); 966 if (error) 967 goto out_parent; 968 969 error = gfs2_glock_nq(&gh); 970 if (error) 971 goto out_child; 972 973 error = -ENOENT; 974 if (inode->i_nlink == 0) 975 goto out_gunlock; 976 977 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC); 978 if (error) 979 goto out_gunlock; 980 981 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 982 switch (error) { 983 case -ENOENT: 984 break; 985 case 0: 986 error = -EEXIST; 987 goto out_gunlock; 988 default: 989 goto out_gunlock; 990 } 991 992 error = -EINVAL; 993 if (!dip->i_inode.i_nlink) 994 goto out_gunlock; 995 error = -EFBIG; 996 if (dip->i_entries == (u32)-1) 997 goto out_gunlock; 998 error = -EPERM; 999 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1000 goto out_gunlock; 1001 error = -EMLINK; 1002 if (ip->i_inode.i_nlink == (u32)-1) 1003 goto out_gunlock; 1004 1005 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 1006 if (error < 0) 1007 goto out_gunlock; 1008 1009 if (da.nr_blocks) { 1010 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1011 error = gfs2_quota_lock_check(dip, &ap); 1012 if (error) 1013 goto out_gunlock; 1014 1015 error = gfs2_inplace_reserve(dip, &ap); 1016 if (error) 1017 goto out_gunlock_q; 1018 1019 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 1020 if (error) 1021 goto out_ipres; 1022 } else { 1023 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1024 if (error) 1025 goto out_ipres; 1026 } 1027 1028 error = gfs2_meta_inode_buffer(ip, &dibh); 1029 if (error) 1030 goto out_end_trans; 1031 1032 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1033 if (error) 1034 goto out_brelse; 1035 1036 gfs2_trans_add_meta(ip->i_gl, dibh); 1037 inc_nlink(&ip->i_inode); 1038 inode_set_ctime_current(&ip->i_inode); 1039 ihold(inode); 1040 d_instantiate(dentry, inode); 1041 mark_inode_dirty(inode); 1042 1043out_brelse: 1044 brelse(dibh); 1045out_end_trans: 1046 gfs2_trans_end(sdp); 1047out_ipres: 1048 if (da.nr_blocks) 1049 gfs2_inplace_release(dip); 1050out_gunlock_q: 1051 if (da.nr_blocks) 1052 gfs2_quota_unlock(dip); 1053out_gunlock: 1054 gfs2_dir_no_add(&da); 1055 gfs2_glock_dq(&gh); 1056out_child: 1057 gfs2_glock_dq(&d_gh); 1058out_parent: 1059 gfs2_qa_put(dip); 1060 gfs2_holder_uninit(&d_gh); 1061 gfs2_holder_uninit(&gh); 1062 return error; 1063} 1064 1065/* 1066 * gfs2_unlink_ok - check to see that a inode is still in a directory 1067 * @dip: the directory 1068 * @name: the name of the file 1069 * @ip: the inode 1070 * 1071 * Assumes that the lock on (at least) @dip is held. 1072 * 1073 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1074 */ 1075 1076static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1077 const struct gfs2_inode *ip) 1078{ 1079 int error; 1080 1081 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1082 return -EPERM; 1083 1084 if ((dip->i_inode.i_mode & S_ISVTX) && 1085 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1086 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1087 return -EPERM; 1088 1089 if (IS_APPEND(&dip->i_inode)) 1090 return -EPERM; 1091 1092 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode, 1093 MAY_WRITE | MAY_EXEC); 1094 if (error) 1095 return error; 1096 1097 return gfs2_dir_check(&dip->i_inode, name, ip); 1098} 1099 1100/** 1101 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1102 * @dip: The parent directory 1103 * @dentry: The dentry to unlink 1104 * 1105 * Called with all the locks and in a transaction. This will only be 1106 * called for a directory after it has been checked to ensure it is empty. 1107 * 1108 * Returns: 0 on success, or an error 1109 */ 1110 1111static int gfs2_unlink_inode(struct gfs2_inode *dip, 1112 const struct dentry *dentry) 1113{ 1114 struct inode *inode = d_inode(dentry); 1115 struct gfs2_inode *ip = GFS2_I(inode); 1116 int error; 1117 1118 error = gfs2_dir_del(dip, dentry); 1119 if (error) 1120 return error; 1121 1122 ip->i_entries = 0; 1123 inode_set_ctime_current(inode); 1124 if (S_ISDIR(inode->i_mode)) 1125 clear_nlink(inode); 1126 else 1127 drop_nlink(inode); 1128 mark_inode_dirty(inode); 1129 if (inode->i_nlink == 0) 1130 gfs2_unlink_di(inode); 1131 return 0; 1132} 1133 1134 1135/** 1136 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1137 * @dir: The inode of the directory containing the inode to unlink 1138 * @dentry: The file itself 1139 * 1140 * This routine uses the type of the inode as a flag to figure out 1141 * whether this is an unlink or an rmdir. 1142 * 1143 * Returns: errno 1144 */ 1145 1146static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1147{ 1148 struct gfs2_inode *dip = GFS2_I(dir); 1149 struct gfs2_sbd *sdp = GFS2_SB(dir); 1150 struct inode *inode = d_inode(dentry); 1151 struct gfs2_inode *ip = GFS2_I(inode); 1152 struct gfs2_holder d_gh, r_gh, gh; 1153 struct gfs2_rgrpd *rgd; 1154 int error; 1155 1156 error = gfs2_rindex_update(sdp); 1157 if (error) 1158 return error; 1159 1160 error = -EROFS; 1161 1162 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh); 1163 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1164 1165 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1166 if (!rgd) 1167 goto out_inodes; 1168 1169 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh); 1170 1171 1172 error = gfs2_glock_nq(&d_gh); 1173 if (error) 1174 goto out_parent; 1175 1176 error = gfs2_glock_nq(&gh); 1177 if (error) 1178 goto out_child; 1179 1180 error = -ENOENT; 1181 if (inode->i_nlink == 0) 1182 goto out_rgrp; 1183 1184 if (S_ISDIR(inode->i_mode)) { 1185 error = -ENOTEMPTY; 1186 if (ip->i_entries > 2 || inode->i_nlink > 2) 1187 goto out_rgrp; 1188 } 1189 1190 error = gfs2_glock_nq(&r_gh); /* rgrp */ 1191 if (error) 1192 goto out_rgrp; 1193 1194 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1195 if (error) 1196 goto out_gunlock; 1197 1198 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1199 if (error) 1200 goto out_gunlock; 1201 1202 error = gfs2_unlink_inode(dip, dentry); 1203 gfs2_trans_end(sdp); 1204 1205out_gunlock: 1206 gfs2_glock_dq(&r_gh); 1207out_rgrp: 1208 gfs2_glock_dq(&gh); 1209out_child: 1210 gfs2_glock_dq(&d_gh); 1211out_parent: 1212 gfs2_holder_uninit(&r_gh); 1213out_inodes: 1214 gfs2_holder_uninit(&gh); 1215 gfs2_holder_uninit(&d_gh); 1216 return error; 1217} 1218 1219/** 1220 * gfs2_symlink - Create a symlink 1221 * @idmap: idmap of the mount the inode was found from 1222 * @dir: The directory to create the symlink in 1223 * @dentry: The dentry to put the symlink in 1224 * @symname: The thing which the link points to 1225 * 1226 * Returns: errno 1227 */ 1228 1229static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir, 1230 struct dentry *dentry, const char *symname) 1231{ 1232 unsigned int size; 1233 1234 size = strlen(symname); 1235 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1236 return -ENAMETOOLONG; 1237 1238 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1239} 1240 1241/** 1242 * gfs2_mkdir - Make a directory 1243 * @idmap: idmap of the mount the inode was found from 1244 * @dir: The parent directory of the new one 1245 * @dentry: The dentry of the new directory 1246 * @mode: The mode of the new directory 1247 * 1248 * Returns: errno 1249 */ 1250 1251static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1252 struct dentry *dentry, umode_t mode) 1253{ 1254 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1255 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1256} 1257 1258/** 1259 * gfs2_mknod - Make a special file 1260 * @idmap: idmap of the mount the inode was found from 1261 * @dir: The directory in which the special file will reside 1262 * @dentry: The dentry of the special file 1263 * @mode: The mode of the special file 1264 * @dev: The device specification of the special file 1265 * 1266 */ 1267 1268static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir, 1269 struct dentry *dentry, umode_t mode, dev_t dev) 1270{ 1271 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1272} 1273 1274/** 1275 * gfs2_atomic_open - Atomically open a file 1276 * @dir: The directory 1277 * @dentry: The proposed new entry 1278 * @file: The proposed new struct file 1279 * @flags: open flags 1280 * @mode: File mode 1281 * 1282 * Returns: error code or 0 for success 1283 */ 1284 1285static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1286 struct file *file, unsigned flags, 1287 umode_t mode) 1288{ 1289 struct dentry *d; 1290 bool excl = !!(flags & O_EXCL); 1291 1292 if (!d_in_lookup(dentry)) 1293 goto skip_lookup; 1294 1295 d = __gfs2_lookup(dir, dentry, file); 1296 if (IS_ERR(d)) 1297 return PTR_ERR(d); 1298 if (d != NULL) 1299 dentry = d; 1300 if (d_really_is_positive(dentry)) { 1301 if (!(file->f_mode & FMODE_OPENED)) 1302 return finish_no_open(file, d); 1303 dput(d); 1304 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1305 } 1306 1307 BUG_ON(d != NULL); 1308 1309skip_lookup: 1310 if (!(flags & O_CREAT)) 1311 return -ENOENT; 1312 1313 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1314} 1315 1316/* 1317 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1318 * @this: move this 1319 * @to: to here 1320 * 1321 * Follow @to back to the root and make sure we don't encounter @this 1322 * Assumes we already hold the rename lock. 1323 * 1324 * Returns: errno 1325 */ 1326 1327static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1328{ 1329 struct inode *dir = &to->i_inode; 1330 struct super_block *sb = dir->i_sb; 1331 struct inode *tmp; 1332 int error = 0; 1333 1334 igrab(dir); 1335 1336 for (;;) { 1337 if (dir == &this->i_inode) { 1338 error = -EINVAL; 1339 break; 1340 } 1341 if (dir == d_inode(sb->s_root)) { 1342 error = 0; 1343 break; 1344 } 1345 1346 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1347 if (!tmp) { 1348 error = -ENOENT; 1349 break; 1350 } 1351 if (IS_ERR(tmp)) { 1352 error = PTR_ERR(tmp); 1353 break; 1354 } 1355 1356 iput(dir); 1357 dir = tmp; 1358 } 1359 1360 iput(dir); 1361 1362 return error; 1363} 1364 1365/** 1366 * update_moved_ino - Update an inode that's being moved 1367 * @ip: The inode being moved 1368 * @ndip: The parent directory of the new filename 1369 * @dir_rename: True of ip is a directory 1370 * 1371 * Returns: errno 1372 */ 1373 1374static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1375 int dir_rename) 1376{ 1377 if (dir_rename) 1378 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1379 1380 inode_set_ctime_current(&ip->i_inode); 1381 mark_inode_dirty_sync(&ip->i_inode); 1382 return 0; 1383} 1384 1385 1386/** 1387 * gfs2_rename - Rename a file 1388 * @odir: Parent directory of old file name 1389 * @odentry: The old dentry of the file 1390 * @ndir: Parent directory of new file name 1391 * @ndentry: The new dentry of the file 1392 * 1393 * Returns: errno 1394 */ 1395 1396static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1397 struct inode *ndir, struct dentry *ndentry) 1398{ 1399 struct gfs2_inode *odip = GFS2_I(odir); 1400 struct gfs2_inode *ndip = GFS2_I(ndir); 1401 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1402 struct gfs2_inode *nip = NULL; 1403 struct gfs2_sbd *sdp = GFS2_SB(odir); 1404 struct gfs2_holder ghs[4], r_gh, rd_gh; 1405 struct gfs2_rgrpd *nrgd; 1406 unsigned int num_gh; 1407 int dir_rename = 0; 1408 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1409 unsigned int x; 1410 int error; 1411 1412 gfs2_holder_mark_uninitialized(&r_gh); 1413 gfs2_holder_mark_uninitialized(&rd_gh); 1414 if (d_really_is_positive(ndentry)) { 1415 nip = GFS2_I(d_inode(ndentry)); 1416 if (ip == nip) 1417 return 0; 1418 } 1419 1420 error = gfs2_rindex_update(sdp); 1421 if (error) 1422 return error; 1423 1424 error = gfs2_qa_get(ndip); 1425 if (error) 1426 return error; 1427 1428 if (odip != ndip) { 1429 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1430 0, &r_gh); 1431 if (error) 1432 goto out; 1433 1434 if (S_ISDIR(ip->i_inode.i_mode)) { 1435 dir_rename = 1; 1436 /* don't move a directory into its subdir */ 1437 error = gfs2_ok_to_move(ip, ndip); 1438 if (error) 1439 goto out_gunlock_r; 1440 } 1441 } 1442 1443 num_gh = 1; 1444 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1445 if (odip != ndip) { 1446 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1447 ghs + num_gh); 1448 num_gh++; 1449 } 1450 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1451 num_gh++; 1452 1453 if (nip) { 1454 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1455 ghs + num_gh); 1456 num_gh++; 1457 } 1458 1459 for (x = 0; x < num_gh; x++) { 1460 error = gfs2_glock_nq(ghs + x); 1461 if (error) 1462 goto out_gunlock; 1463 } 1464 error = gfs2_glock_async_wait(num_gh, ghs); 1465 if (error) 1466 goto out_gunlock; 1467 1468 if (nip) { 1469 /* Grab the resource group glock for unlink flag twiddling. 1470 * This is the case where the target dinode already exists 1471 * so we unlink before doing the rename. 1472 */ 1473 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1474 if (!nrgd) { 1475 error = -ENOENT; 1476 goto out_gunlock; 1477 } 1478 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 1479 LM_FLAG_NODE_SCOPE, &rd_gh); 1480 if (error) 1481 goto out_gunlock; 1482 } 1483 1484 error = -ENOENT; 1485 if (ip->i_inode.i_nlink == 0) 1486 goto out_gunlock; 1487 1488 /* Check out the old directory */ 1489 1490 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1491 if (error) 1492 goto out_gunlock; 1493 1494 /* Check out the new directory */ 1495 1496 if (nip) { 1497 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1498 if (error) 1499 goto out_gunlock; 1500 1501 if (nip->i_inode.i_nlink == 0) { 1502 error = -EAGAIN; 1503 goto out_gunlock; 1504 } 1505 1506 if (S_ISDIR(nip->i_inode.i_mode)) { 1507 if (nip->i_entries < 2) { 1508 gfs2_consist_inode(nip); 1509 error = -EIO; 1510 goto out_gunlock; 1511 } 1512 if (nip->i_entries > 2) { 1513 error = -ENOTEMPTY; 1514 goto out_gunlock; 1515 } 1516 } 1517 } else { 1518 error = gfs2_permission(&nop_mnt_idmap, ndir, 1519 MAY_WRITE | MAY_EXEC); 1520 if (error) 1521 goto out_gunlock; 1522 1523 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1524 switch (error) { 1525 case -ENOENT: 1526 error = 0; 1527 break; 1528 case 0: 1529 error = -EEXIST; 1530 goto out_gunlock; 1531 default: 1532 goto out_gunlock; 1533 } 1534 1535 if (odip != ndip) { 1536 if (!ndip->i_inode.i_nlink) { 1537 error = -ENOENT; 1538 goto out_gunlock; 1539 } 1540 if (ndip->i_entries == (u32)-1) { 1541 error = -EFBIG; 1542 goto out_gunlock; 1543 } 1544 if (S_ISDIR(ip->i_inode.i_mode) && 1545 ndip->i_inode.i_nlink == (u32)-1) { 1546 error = -EMLINK; 1547 goto out_gunlock; 1548 } 1549 } 1550 } 1551 1552 /* Check out the dir to be renamed */ 1553 1554 if (dir_rename) { 1555 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry), 1556 MAY_WRITE); 1557 if (error) 1558 goto out_gunlock; 1559 } 1560 1561 if (nip == NULL) { 1562 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1563 if (error) 1564 goto out_gunlock; 1565 } 1566 1567 if (da.nr_blocks) { 1568 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1569 error = gfs2_quota_lock_check(ndip, &ap); 1570 if (error) 1571 goto out_gunlock; 1572 1573 error = gfs2_inplace_reserve(ndip, &ap); 1574 if (error) 1575 goto out_gunlock_q; 1576 1577 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1578 4 * RES_LEAF + 4, 0); 1579 if (error) 1580 goto out_ipreserv; 1581 } else { 1582 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1583 5 * RES_LEAF + 4, 0); 1584 if (error) 1585 goto out_gunlock; 1586 } 1587 1588 /* Remove the target file, if it exists */ 1589 1590 if (nip) 1591 error = gfs2_unlink_inode(ndip, ndentry); 1592 1593 error = update_moved_ino(ip, ndip, dir_rename); 1594 if (error) 1595 goto out_end_trans; 1596 1597 error = gfs2_dir_del(odip, odentry); 1598 if (error) 1599 goto out_end_trans; 1600 1601 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1602 if (error) 1603 goto out_end_trans; 1604 1605out_end_trans: 1606 gfs2_trans_end(sdp); 1607out_ipreserv: 1608 if (da.nr_blocks) 1609 gfs2_inplace_release(ndip); 1610out_gunlock_q: 1611 if (da.nr_blocks) 1612 gfs2_quota_unlock(ndip); 1613out_gunlock: 1614 gfs2_dir_no_add(&da); 1615 if (gfs2_holder_initialized(&rd_gh)) 1616 gfs2_glock_dq_uninit(&rd_gh); 1617 1618 while (x--) { 1619 if (gfs2_holder_queued(ghs + x)) 1620 gfs2_glock_dq(ghs + x); 1621 gfs2_holder_uninit(ghs + x); 1622 } 1623out_gunlock_r: 1624 if (gfs2_holder_initialized(&r_gh)) 1625 gfs2_glock_dq_uninit(&r_gh); 1626out: 1627 gfs2_qa_put(ndip); 1628 return error; 1629} 1630 1631/** 1632 * gfs2_exchange - exchange two files 1633 * @odir: Parent directory of old file name 1634 * @odentry: The old dentry of the file 1635 * @ndir: Parent directory of new file name 1636 * @ndentry: The new dentry of the file 1637 * @flags: The rename flags 1638 * 1639 * Returns: errno 1640 */ 1641 1642static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1643 struct inode *ndir, struct dentry *ndentry, 1644 unsigned int flags) 1645{ 1646 struct gfs2_inode *odip = GFS2_I(odir); 1647 struct gfs2_inode *ndip = GFS2_I(ndir); 1648 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1649 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1650 struct gfs2_sbd *sdp = GFS2_SB(odir); 1651 struct gfs2_holder ghs[4], r_gh; 1652 unsigned int num_gh; 1653 unsigned int x; 1654 umode_t old_mode = oip->i_inode.i_mode; 1655 umode_t new_mode = nip->i_inode.i_mode; 1656 int error; 1657 1658 gfs2_holder_mark_uninitialized(&r_gh); 1659 error = gfs2_rindex_update(sdp); 1660 if (error) 1661 return error; 1662 1663 if (odip != ndip) { 1664 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1665 0, &r_gh); 1666 if (error) 1667 goto out; 1668 1669 if (S_ISDIR(old_mode)) { 1670 /* don't move a directory into its subdir */ 1671 error = gfs2_ok_to_move(oip, ndip); 1672 if (error) 1673 goto out_gunlock_r; 1674 } 1675 1676 if (S_ISDIR(new_mode)) { 1677 /* don't move a directory into its subdir */ 1678 error = gfs2_ok_to_move(nip, odip); 1679 if (error) 1680 goto out_gunlock_r; 1681 } 1682 } 1683 1684 num_gh = 1; 1685 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1686 if (odip != ndip) { 1687 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1688 ghs + num_gh); 1689 num_gh++; 1690 } 1691 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1692 num_gh++; 1693 1694 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1695 num_gh++; 1696 1697 for (x = 0; x < num_gh; x++) { 1698 error = gfs2_glock_nq(ghs + x); 1699 if (error) 1700 goto out_gunlock; 1701 } 1702 1703 error = gfs2_glock_async_wait(num_gh, ghs); 1704 if (error) 1705 goto out_gunlock; 1706 1707 error = -ENOENT; 1708 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1709 goto out_gunlock; 1710 1711 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1712 if (error) 1713 goto out_gunlock; 1714 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1715 if (error) 1716 goto out_gunlock; 1717 1718 if (S_ISDIR(old_mode)) { 1719 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode, 1720 MAY_WRITE); 1721 if (error) 1722 goto out_gunlock; 1723 } 1724 if (S_ISDIR(new_mode)) { 1725 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode, 1726 MAY_WRITE); 1727 if (error) 1728 goto out_gunlock; 1729 } 1730 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1731 if (error) 1732 goto out_gunlock; 1733 1734 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1735 if (error) 1736 goto out_end_trans; 1737 1738 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1739 if (error) 1740 goto out_end_trans; 1741 1742 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1743 IF2DT(old_mode)); 1744 if (error) 1745 goto out_end_trans; 1746 1747 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1748 IF2DT(new_mode)); 1749 if (error) 1750 goto out_end_trans; 1751 1752 if (odip != ndip) { 1753 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1754 inc_nlink(&odip->i_inode); 1755 drop_nlink(&ndip->i_inode); 1756 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1757 inc_nlink(&ndip->i_inode); 1758 drop_nlink(&odip->i_inode); 1759 } 1760 } 1761 mark_inode_dirty(&ndip->i_inode); 1762 if (odip != ndip) 1763 mark_inode_dirty(&odip->i_inode); 1764 1765out_end_trans: 1766 gfs2_trans_end(sdp); 1767out_gunlock: 1768 while (x--) { 1769 if (gfs2_holder_queued(ghs + x)) 1770 gfs2_glock_dq(ghs + x); 1771 gfs2_holder_uninit(ghs + x); 1772 } 1773out_gunlock_r: 1774 if (gfs2_holder_initialized(&r_gh)) 1775 gfs2_glock_dq_uninit(&r_gh); 1776out: 1777 return error; 1778} 1779 1780static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir, 1781 struct dentry *odentry, struct inode *ndir, 1782 struct dentry *ndentry, unsigned int flags) 1783{ 1784 flags &= ~RENAME_NOREPLACE; 1785 1786 if (flags & ~RENAME_EXCHANGE) 1787 return -EINVAL; 1788 1789 if (flags & RENAME_EXCHANGE) 1790 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1791 1792 return gfs2_rename(odir, odentry, ndir, ndentry); 1793} 1794 1795/** 1796 * gfs2_get_link - Follow a symbolic link 1797 * @dentry: The dentry of the link 1798 * @inode: The inode of the link 1799 * @done: destructor for return value 1800 * 1801 * This can handle symlinks of any size. 1802 * 1803 * Returns: 0 on success or error code 1804 */ 1805 1806static const char *gfs2_get_link(struct dentry *dentry, 1807 struct inode *inode, 1808 struct delayed_call *done) 1809{ 1810 struct gfs2_inode *ip = GFS2_I(inode); 1811 struct gfs2_holder i_gh; 1812 struct buffer_head *dibh; 1813 unsigned int size; 1814 char *buf; 1815 int error; 1816 1817 if (!dentry) 1818 return ERR_PTR(-ECHILD); 1819 1820 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1821 error = gfs2_glock_nq(&i_gh); 1822 if (error) { 1823 gfs2_holder_uninit(&i_gh); 1824 return ERR_PTR(error); 1825 } 1826 1827 size = (unsigned int)i_size_read(&ip->i_inode); 1828 if (size == 0) { 1829 gfs2_consist_inode(ip); 1830 buf = ERR_PTR(-EIO); 1831 goto out; 1832 } 1833 1834 error = gfs2_meta_inode_buffer(ip, &dibh); 1835 if (error) { 1836 buf = ERR_PTR(error); 1837 goto out; 1838 } 1839 1840 buf = kzalloc(size + 1, GFP_NOFS); 1841 if (!buf) 1842 buf = ERR_PTR(-ENOMEM); 1843 else 1844 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1845 brelse(dibh); 1846out: 1847 gfs2_glock_dq_uninit(&i_gh); 1848 if (!IS_ERR(buf)) 1849 set_delayed_call(done, kfree_link, buf); 1850 return buf; 1851} 1852 1853/** 1854 * gfs2_permission 1855 * @idmap: idmap of the mount the inode was found from 1856 * @inode: The inode 1857 * @mask: The mask to be tested 1858 * 1859 * This may be called from the VFS directly, or from within GFS2 with the 1860 * inode locked, so we look to see if the glock is already locked and only 1861 * lock the glock if its not already been done. 1862 * 1863 * Returns: errno 1864 */ 1865 1866int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode, 1867 int mask) 1868{ 1869 int may_not_block = mask & MAY_NOT_BLOCK; 1870 struct gfs2_inode *ip; 1871 struct gfs2_holder i_gh; 1872 struct gfs2_glock *gl; 1873 int error; 1874 1875 gfs2_holder_mark_uninitialized(&i_gh); 1876 ip = GFS2_I(inode); 1877 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1878 if (unlikely(!gl)) { 1879 /* inode is getting torn down, must be RCU mode */ 1880 WARN_ON_ONCE(!may_not_block); 1881 return -ECHILD; 1882 } 1883 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1884 if (may_not_block) 1885 return -ECHILD; 1886 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1887 if (error) 1888 return error; 1889 } 1890 1891 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1892 error = -EPERM; 1893 else 1894 error = generic_permission(&nop_mnt_idmap, inode, mask); 1895 if (gfs2_holder_initialized(&i_gh)) 1896 gfs2_glock_dq_uninit(&i_gh); 1897 1898 return error; 1899} 1900 1901static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1902{ 1903 setattr_copy(&nop_mnt_idmap, inode, attr); 1904 mark_inode_dirty(inode); 1905 return 0; 1906} 1907 1908static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1909{ 1910 int error; 1911 1912 if (current->journal_info) 1913 return __gfs2_setattr_simple(inode, attr); 1914 1915 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1916 if (error) 1917 return error; 1918 1919 error = __gfs2_setattr_simple(inode, attr); 1920 gfs2_trans_end(GFS2_SB(inode)); 1921 return error; 1922} 1923 1924static int setattr_chown(struct inode *inode, struct iattr *attr) 1925{ 1926 struct gfs2_inode *ip = GFS2_I(inode); 1927 struct gfs2_sbd *sdp = GFS2_SB(inode); 1928 kuid_t ouid, nuid; 1929 kgid_t ogid, ngid; 1930 int error; 1931 struct gfs2_alloc_parms ap; 1932 1933 ouid = inode->i_uid; 1934 ogid = inode->i_gid; 1935 nuid = attr->ia_uid; 1936 ngid = attr->ia_gid; 1937 1938 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1939 ouid = nuid = NO_UID_QUOTA_CHANGE; 1940 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1941 ogid = ngid = NO_GID_QUOTA_CHANGE; 1942 error = gfs2_qa_get(ip); 1943 if (error) 1944 return error; 1945 1946 error = gfs2_rindex_update(sdp); 1947 if (error) 1948 goto out; 1949 1950 error = gfs2_quota_lock(ip, nuid, ngid); 1951 if (error) 1952 goto out; 1953 1954 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1955 1956 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1957 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1958 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1959 if (error) 1960 goto out_gunlock_q; 1961 } 1962 1963 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1964 if (error) 1965 goto out_gunlock_q; 1966 1967 error = gfs2_setattr_simple(inode, attr); 1968 if (error) 1969 goto out_end_trans; 1970 1971 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1972 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1973 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1974 gfs2_quota_change(ip, ap.target, nuid, ngid); 1975 } 1976 1977out_end_trans: 1978 gfs2_trans_end(sdp); 1979out_gunlock_q: 1980 gfs2_quota_unlock(ip); 1981out: 1982 gfs2_qa_put(ip); 1983 return error; 1984} 1985 1986/** 1987 * gfs2_setattr - Change attributes on an inode 1988 * @idmap: idmap of the mount the inode was found from 1989 * @dentry: The dentry which is changing 1990 * @attr: The structure describing the change 1991 * 1992 * The VFS layer wants to change one or more of an inodes attributes. Write 1993 * that change out to disk. 1994 * 1995 * Returns: errno 1996 */ 1997 1998static int gfs2_setattr(struct mnt_idmap *idmap, 1999 struct dentry *dentry, struct iattr *attr) 2000{ 2001 struct inode *inode = d_inode(dentry); 2002 struct gfs2_inode *ip = GFS2_I(inode); 2003 struct gfs2_holder i_gh; 2004 int error; 2005 2006 error = gfs2_qa_get(ip); 2007 if (error) 2008 return error; 2009 2010 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 2011 if (error) 2012 goto out; 2013 2014 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid); 2015 if (error) 2016 goto error; 2017 2018 error = setattr_prepare(&nop_mnt_idmap, dentry, attr); 2019 if (error) 2020 goto error; 2021 2022 if (attr->ia_valid & ATTR_SIZE) 2023 error = gfs2_setattr_size(inode, attr->ia_size); 2024 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2025 error = setattr_chown(inode, attr); 2026 else { 2027 error = gfs2_setattr_simple(inode, attr); 2028 if (!error && attr->ia_valid & ATTR_MODE) 2029 error = posix_acl_chmod(&nop_mnt_idmap, dentry, 2030 inode->i_mode); 2031 } 2032 2033error: 2034 if (!error) 2035 mark_inode_dirty(inode); 2036 gfs2_glock_dq_uninit(&i_gh); 2037out: 2038 gfs2_qa_put(ip); 2039 return error; 2040} 2041 2042/** 2043 * gfs2_getattr - Read out an inode's attributes 2044 * @idmap: idmap of the mount the inode was found from 2045 * @path: Object to query 2046 * @stat: The inode's stats 2047 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2048 * @flags: AT_STATX_xxx setting 2049 * 2050 * This may be called from the VFS directly, or from within GFS2 with the 2051 * inode locked, so we look to see if the glock is already locked and only 2052 * lock the glock if its not already been done. Note that its the NFS 2053 * readdirplus operation which causes this to be called (from filldir) 2054 * with the glock already held. 2055 * 2056 * Returns: errno 2057 */ 2058 2059static int gfs2_getattr(struct mnt_idmap *idmap, 2060 const struct path *path, struct kstat *stat, 2061 u32 request_mask, unsigned int flags) 2062{ 2063 struct inode *inode = d_inode(path->dentry); 2064 struct gfs2_inode *ip = GFS2_I(inode); 2065 struct gfs2_holder gh; 2066 u32 gfsflags; 2067 int error; 2068 2069 gfs2_holder_mark_uninitialized(&gh); 2070 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2071 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2072 if (error) 2073 return error; 2074 } 2075 2076 gfsflags = ip->i_diskflags; 2077 if (gfsflags & GFS2_DIF_APPENDONLY) 2078 stat->attributes |= STATX_ATTR_APPEND; 2079 if (gfsflags & GFS2_DIF_IMMUTABLE) 2080 stat->attributes |= STATX_ATTR_IMMUTABLE; 2081 2082 stat->attributes_mask |= (STATX_ATTR_APPEND | 2083 STATX_ATTR_COMPRESSED | 2084 STATX_ATTR_ENCRYPTED | 2085 STATX_ATTR_IMMUTABLE | 2086 STATX_ATTR_NODUMP); 2087 2088 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 2089 2090 if (gfs2_holder_initialized(&gh)) 2091 gfs2_glock_dq_uninit(&gh); 2092 2093 return 0; 2094} 2095 2096static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2097 u64 start, u64 len) 2098{ 2099 struct gfs2_inode *ip = GFS2_I(inode); 2100 struct gfs2_holder gh; 2101 int ret; 2102 2103 inode_lock_shared(inode); 2104 2105 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2106 if (ret) 2107 goto out; 2108 2109 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2110 2111 gfs2_glock_dq_uninit(&gh); 2112 2113out: 2114 inode_unlock_shared(inode); 2115 return ret; 2116} 2117 2118loff_t gfs2_seek_data(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_data(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 2137loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2138{ 2139 struct inode *inode = file->f_mapping->host; 2140 struct gfs2_inode *ip = GFS2_I(inode); 2141 struct gfs2_holder gh; 2142 loff_t ret; 2143 2144 inode_lock_shared(inode); 2145 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2146 if (!ret) 2147 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2148 gfs2_glock_dq_uninit(&gh); 2149 inode_unlock_shared(inode); 2150 2151 if (ret < 0) 2152 return ret; 2153 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2154} 2155 2156static int gfs2_update_time(struct inode *inode, int flags) 2157{ 2158 struct gfs2_inode *ip = GFS2_I(inode); 2159 struct gfs2_glock *gl = ip->i_gl; 2160 struct gfs2_holder *gh; 2161 int error; 2162 2163 gh = gfs2_glock_is_locked_by_me(gl); 2164 if (gh && !gfs2_glock_is_held_excl(gl)) { 2165 gfs2_glock_dq(gh); 2166 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2167 error = gfs2_glock_nq(gh); 2168 if (error) 2169 return error; 2170 } 2171 generic_update_time(inode, flags); 2172 return 0; 2173} 2174 2175static const struct inode_operations gfs2_file_iops = { 2176 .permission = gfs2_permission, 2177 .setattr = gfs2_setattr, 2178 .getattr = gfs2_getattr, 2179 .listxattr = gfs2_listxattr, 2180 .fiemap = gfs2_fiemap, 2181 .get_inode_acl = gfs2_get_acl, 2182 .set_acl = gfs2_set_acl, 2183 .update_time = gfs2_update_time, 2184 .fileattr_get = gfs2_fileattr_get, 2185 .fileattr_set = gfs2_fileattr_set, 2186}; 2187 2188static const struct inode_operations gfs2_dir_iops = { 2189 .create = gfs2_create, 2190 .lookup = gfs2_lookup, 2191 .link = gfs2_link, 2192 .unlink = gfs2_unlink, 2193 .symlink = gfs2_symlink, 2194 .mkdir = gfs2_mkdir, 2195 .rmdir = gfs2_unlink, 2196 .mknod = gfs2_mknod, 2197 .rename = gfs2_rename2, 2198 .permission = gfs2_permission, 2199 .setattr = gfs2_setattr, 2200 .getattr = gfs2_getattr, 2201 .listxattr = gfs2_listxattr, 2202 .fiemap = gfs2_fiemap, 2203 .get_inode_acl = gfs2_get_acl, 2204 .set_acl = gfs2_set_acl, 2205 .update_time = gfs2_update_time, 2206 .atomic_open = gfs2_atomic_open, 2207 .fileattr_get = gfs2_fileattr_get, 2208 .fileattr_set = gfs2_fileattr_set, 2209}; 2210 2211static const struct inode_operations gfs2_symlink_iops = { 2212 .get_link = gfs2_get_link, 2213 .permission = gfs2_permission, 2214 .setattr = gfs2_setattr, 2215 .getattr = gfs2_getattr, 2216 .listxattr = gfs2_listxattr, 2217 .fiemap = gfs2_fiemap, 2218}; 2219 2220