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 int iget_test(struct inode *inode, void *opaque) 40{ 41 u64 no_addr = *(u64 *)opaque; 42 43 return GFS2_I(inode)->i_no_addr == no_addr; 44} 45 46static int iget_set(struct inode *inode, void *opaque) 47{ 48 u64 no_addr = *(u64 *)opaque; 49 50 GFS2_I(inode)->i_no_addr = no_addr; 51 inode->i_ino = no_addr; 52 return 0; 53} 54 55static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) 56{ 57 struct inode *inode; 58 59repeat: 60 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); 61 if (!inode) 62 return inode; 63 if (is_bad_inode(inode)) { 64 iput(inode); 65 goto repeat; 66 } 67 return inode; 68} 69 70/** 71 * gfs2_set_iop - Sets inode operations 72 * @inode: The inode with correct i_mode filled in 73 * 74 * GFS2 lookup code fills in vfs inode contents based on info obtained 75 * from directory entry inside gfs2_inode_lookup(). 76 */ 77 78static void gfs2_set_iop(struct inode *inode) 79{ 80 struct gfs2_sbd *sdp = GFS2_SB(inode); 81 umode_t mode = inode->i_mode; 82 83 if (S_ISREG(mode)) { 84 inode->i_op = &gfs2_file_iops; 85 if (gfs2_localflocks(sdp)) 86 inode->i_fop = &gfs2_file_fops_nolock; 87 else 88 inode->i_fop = &gfs2_file_fops; 89 } else if (S_ISDIR(mode)) { 90 inode->i_op = &gfs2_dir_iops; 91 if (gfs2_localflocks(sdp)) 92 inode->i_fop = &gfs2_dir_fops_nolock; 93 else 94 inode->i_fop = &gfs2_dir_fops; 95 } else if (S_ISLNK(mode)) { 96 inode->i_op = &gfs2_symlink_iops; 97 } else { 98 inode->i_op = &gfs2_file_iops; 99 init_special_inode(inode, inode->i_mode, inode->i_rdev); 100 } 101} 102 103/** 104 * gfs2_inode_lookup - Lookup an inode 105 * @sb: The super block 106 * @type: The type of the inode 107 * @no_addr: The inode number 108 * @no_formal_ino: The inode generation number 109 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; 110 * GFS2_BLKST_FREE to indicate not to verify) 111 * 112 * If @type is DT_UNKNOWN, the inode type is fetched from disk. 113 * 114 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a 115 * placeholder because it doesn't otherwise make sense), the on-disk block type 116 * is verified to be @blktype. 117 * 118 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) 119 * if it detects that @no_formal_ino doesn't match the actual inode generation 120 * number. However, it doesn't always know unless @type is DT_UNKNOWN. 121 * 122 * Returns: A VFS inode, or an error 123 */ 124 125struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 126 u64 no_addr, u64 no_formal_ino, 127 unsigned int blktype) 128{ 129 struct inode *inode; 130 struct gfs2_inode *ip; 131 struct gfs2_glock *io_gl = NULL; 132 struct gfs2_holder i_gh; 133 int error; 134 135 gfs2_holder_mark_uninitialized(&i_gh); 136 inode = gfs2_iget(sb, no_addr); 137 if (!inode) 138 return ERR_PTR(-ENOMEM); 139 140 ip = GFS2_I(inode); 141 142 if (inode->i_state & I_NEW) { 143 struct gfs2_sbd *sdp = GFS2_SB(inode); 144 145 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 146 if (unlikely(error)) 147 goto fail; 148 flush_delayed_work(&ip->i_gl->gl_work); 149 150 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 151 if (unlikely(error)) 152 goto fail; 153 if (blktype != GFS2_BLKST_UNLINKED) 154 gfs2_cancel_delete_work(io_gl); 155 156 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { 157 /* 158 * The GL_SKIP flag indicates to skip reading the inode 159 * block. We read the inode with gfs2_inode_refresh 160 * after possibly checking the block type. 161 */ 162 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 163 GL_SKIP, &i_gh); 164 if (error) 165 goto fail; 166 167 error = -ESTALE; 168 if (no_formal_ino && 169 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) 170 goto fail; 171 172 if (blktype != GFS2_BLKST_FREE) { 173 error = gfs2_check_blk_type(sdp, no_addr, 174 blktype); 175 if (error) 176 goto fail; 177 } 178 } 179 180 glock_set_object(ip->i_gl, ip); 181 set_bit(GIF_INVALID, &ip->i_flags); 182 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 183 if (unlikely(error)) 184 goto fail; 185 glock_set_object(ip->i_iopen_gh.gh_gl, ip); 186 gfs2_glock_put(io_gl); 187 io_gl = NULL; 188 189 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ 190 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); 191 inode->i_atime.tv_nsec = 0; 192 193 if (type == DT_UNKNOWN) { 194 /* Inode glock must be locked already */ 195 error = gfs2_inode_refresh(GFS2_I(inode)); 196 if (error) 197 goto fail; 198 } else { 199 ip->i_no_formal_ino = no_formal_ino; 200 inode->i_mode = DT2IF(type); 201 } 202 203 if (gfs2_holder_initialized(&i_gh)) 204 gfs2_glock_dq_uninit(&i_gh); 205 206 gfs2_set_iop(inode); 207 } 208 209 if (no_formal_ino && ip->i_no_formal_ino && 210 no_formal_ino != ip->i_no_formal_ino) { 211 error = -ESTALE; 212 if (inode->i_state & I_NEW) 213 goto fail; 214 iput(inode); 215 return ERR_PTR(error); 216 } 217 218 if (inode->i_state & I_NEW) 219 unlock_new_inode(inode); 220 221 return inode; 222 223fail: 224 if (io_gl) 225 gfs2_glock_put(io_gl); 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 */ 239struct 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 258fail_iput: 259 iput(inode); 260 return ERR_PTR(error); 261} 262 263 264struct 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 * @d_gh: An initialized holder for the directory glock 285 * @name: The name of the inode to look for 286 * @is_root: If 1, ignore the caller's permissions 287 * @i_gh: An uninitialized holder for the new inode glock 288 * 289 * This can be called via the VFS filldir function when NFS is doing 290 * a readdirplus and the inode which its intending to stat isn't 291 * already in cache. In this case we must not take the directory glock 292 * again, since the readdir call will have already taken that lock. 293 * 294 * Returns: errno 295 */ 296 297struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 298 int is_root) 299{ 300 struct super_block *sb = dir->i_sb; 301 struct gfs2_inode *dip = GFS2_I(dir); 302 struct gfs2_holder d_gh; 303 int error = 0; 304 struct inode *inode = NULL; 305 306 gfs2_holder_mark_uninitialized(&d_gh); 307 if (!name->len || name->len > GFS2_FNAMESIZE) 308 return ERR_PTR(-ENAMETOOLONG); 309 310 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 311 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 312 dir == d_inode(sb->s_root))) { 313 igrab(dir); 314 return dir; 315 } 316 317 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 318 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 319 if (error) 320 return ERR_PTR(error); 321 } 322 323 if (!is_root) { 324 error = gfs2_permission(dir, MAY_EXEC); 325 if (error) 326 goto out; 327 } 328 329 inode = gfs2_dir_search(dir, name, false); 330 if (IS_ERR(inode)) 331 error = PTR_ERR(inode); 332out: 333 if (gfs2_holder_initialized(&d_gh)) 334 gfs2_glock_dq_uninit(&d_gh); 335 if (error == -ENOENT) 336 return NULL; 337 return inode ? inode : ERR_PTR(error); 338} 339 340/** 341 * create_ok - OK to create a new on-disk inode here? 342 * @dip: Directory in which dinode is to be created 343 * @name: Name of new dinode 344 * @mode: 345 * 346 * Returns: errno 347 */ 348 349static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 350 umode_t mode) 351{ 352 int error; 353 354 error = gfs2_permission(&dip->i_inode, 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 370static 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 392static 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 ip->i_no_formal_ino = ip->i_generation; 412 ip->i_inode.i_ino = ip->i_no_addr; 413 ip->i_goal = ip->i_no_addr; 414 415 gfs2_trans_end(sdp); 416 417out_ipreserv: 418 gfs2_inplace_release(ip); 419out_quota: 420 gfs2_quota_unlock(ip); 421out: 422 return error; 423} 424 425static void gfs2_init_dir(struct buffer_head *dibh, 426 const struct gfs2_inode *parent) 427{ 428 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 429 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 430 431 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 432 dent->de_inum = di->di_num; /* already GFS2 endian */ 433 dent->de_type = cpu_to_be16(DT_DIR); 434 435 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 436 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 437 gfs2_inum_out(parent, dent); 438 dent->de_type = cpu_to_be16(DT_DIR); 439 440} 441 442/** 443 * gfs2_init_xattr - Initialise an xattr block for a new inode 444 * @ip: The inode in question 445 * 446 * This sets up an empty xattr block for a new inode, ready to 447 * take any ACLs, LSM xattrs, etc. 448 */ 449 450static void gfs2_init_xattr(struct gfs2_inode *ip) 451{ 452 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 453 struct buffer_head *bh; 454 struct gfs2_ea_header *ea; 455 456 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 457 gfs2_trans_add_meta(ip->i_gl, bh); 458 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 459 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 460 461 ea = GFS2_EA_BH2FIRST(bh); 462 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 463 ea->ea_type = GFS2_EATYPE_UNUSED; 464 ea->ea_flags = GFS2_EAFLAG_LAST; 465 466 brelse(bh); 467} 468 469/** 470 * init_dinode - Fill in a new dinode structure 471 * @dip: The directory this inode is being created in 472 * @ip: The inode 473 * @symname: The symlink destination (if a symlink) 474 * @bhp: The buffer head (returned to caller) 475 * 476 */ 477 478static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 479 const char *symname) 480{ 481 struct gfs2_dinode *di; 482 struct buffer_head *dibh; 483 484 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 485 gfs2_trans_add_meta(ip->i_gl, dibh); 486 di = (struct gfs2_dinode *)dibh->b_data; 487 gfs2_dinode_out(ip, di); 488 489 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 490 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 491 di->__pad1 = 0; 492 di->__pad2 = 0; 493 di->__pad3 = 0; 494 memset(&di->__pad4, 0, sizeof(di->__pad4)); 495 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 496 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 497 498 switch(ip->i_inode.i_mode & S_IFMT) { 499 case S_IFDIR: 500 gfs2_init_dir(dibh, dip); 501 break; 502 case S_IFLNK: 503 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 504 break; 505 } 506 507 set_buffer_uptodate(dibh); 508 brelse(dibh); 509} 510 511/** 512 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 513 * @dip: The directory we are linking into 514 * @da: The dir add information 515 * @nr_inodes: The number of inodes involved 516 * 517 * This calculate the number of blocks we need to reserve in a 518 * transaction to link @nr_inodes into a directory. In most cases 519 * @nr_inodes will be 2 (the directory plus the inode being linked in) 520 * but in case of rename, 4 may be required. 521 * 522 * Returns: Number of blocks 523 */ 524 525static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 526 const struct gfs2_diradd *da, 527 unsigned nr_inodes) 528{ 529 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 530 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 531} 532 533static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 534 struct gfs2_inode *ip, struct gfs2_diradd *da) 535{ 536 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 537 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 538 int error; 539 540 if (da->nr_blocks) { 541 error = gfs2_quota_lock_check(dip, &ap); 542 if (error) 543 goto fail_quota_locks; 544 545 error = gfs2_inplace_reserve(dip, &ap); 546 if (error) 547 goto fail_quota_locks; 548 549 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 550 if (error) 551 goto fail_ipreserv; 552 } else { 553 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 554 if (error) 555 goto fail_quota_locks; 556 } 557 558 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 559 560 gfs2_trans_end(sdp); 561fail_ipreserv: 562 gfs2_inplace_release(dip); 563fail_quota_locks: 564 gfs2_quota_unlock(dip); 565 return error; 566} 567 568static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 569 void *fs_info) 570{ 571 const struct xattr *xattr; 572 int err = 0; 573 574 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 575 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 576 xattr->value_len, 0, 577 GFS2_EATYPE_SECURITY); 578 if (err < 0) 579 break; 580 } 581 return err; 582} 583 584/** 585 * gfs2_create_inode - Create a new inode 586 * @dir: The parent directory 587 * @dentry: The new dentry 588 * @file: If non-NULL, the file which is being opened 589 * @mode: The permissions on the new inode 590 * @dev: For device nodes, this is the device number 591 * @symname: For symlinks, this is the link destination 592 * @size: The initial size of the inode (ignored for directories) 593 * 594 * Returns: 0 on success, or error code 595 */ 596 597static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 598 struct file *file, 599 umode_t mode, dev_t dev, const char *symname, 600 unsigned int size, int excl) 601{ 602 const struct qstr *name = &dentry->d_name; 603 struct posix_acl *default_acl, *acl; 604 struct gfs2_holder ghs[2]; 605 struct inode *inode = NULL; 606 struct gfs2_inode *dip = GFS2_I(dir), *ip; 607 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 608 struct gfs2_glock *io_gl = NULL; 609 int error, free_vfs_inode = 1; 610 u32 aflags = 0; 611 unsigned blocks = 1; 612 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 613 614 if (!name->len || name->len > GFS2_FNAMESIZE) 615 return -ENAMETOOLONG; 616 617 error = gfs2_qa_get(dip); 618 if (error) 619 return error; 620 621 error = gfs2_rindex_update(sdp); 622 if (error) 623 goto fail; 624 625 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 626 if (error) 627 goto fail; 628 gfs2_holder_mark_uninitialized(ghs + 1); 629 630 error = create_ok(dip, name, mode); 631 if (error) 632 goto fail_gunlock; 633 634 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 635 error = PTR_ERR(inode); 636 if (!IS_ERR(inode)) { 637 if (S_ISDIR(inode->i_mode)) { 638 iput(inode); 639 inode = ERR_PTR(-EISDIR); 640 goto fail_gunlock; 641 } 642 d_instantiate(dentry, inode); 643 error = 0; 644 if (file) { 645 if (S_ISREG(inode->i_mode)) 646 error = finish_open(file, dentry, gfs2_open_common); 647 else 648 error = finish_no_open(file, NULL); 649 } 650 gfs2_glock_dq_uninit(ghs); 651 goto fail; 652 } else if (error != -ENOENT) { 653 goto fail_gunlock; 654 } 655 656 error = gfs2_diradd_alloc_required(dir, name, &da); 657 if (error < 0) 658 goto fail_gunlock; 659 660 inode = new_inode(sdp->sd_vfs); 661 error = -ENOMEM; 662 if (!inode) 663 goto fail_gunlock; 664 665 error = posix_acl_create(dir, &mode, &default_acl, &acl); 666 if (error) 667 goto fail_gunlock; 668 669 ip = GFS2_I(inode); 670 error = gfs2_qa_get(ip); 671 if (error) 672 goto fail_free_acls; 673 674 inode->i_mode = mode; 675 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 676 inode->i_rdev = dev; 677 inode->i_size = size; 678 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 679 munge_mode_uid_gid(dip, inode); 680 check_and_update_goal(dip); 681 ip->i_goal = dip->i_goal; 682 ip->i_diskflags = 0; 683 ip->i_eattr = 0; 684 ip->i_height = 0; 685 ip->i_depth = 0; 686 ip->i_entries = 0; 687 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ 688 689 switch(mode & S_IFMT) { 690 case S_IFREG: 691 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 692 gfs2_tune_get(sdp, gt_new_files_jdata)) 693 ip->i_diskflags |= GFS2_DIF_JDATA; 694 gfs2_set_aops(inode); 695 break; 696 case S_IFDIR: 697 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 698 ip->i_diskflags |= GFS2_DIF_JDATA; 699 ip->i_entries = 2; 700 break; 701 } 702 703 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ 704 if (dip->i_diskflags & GFS2_DIF_SYSTEM) 705 ip->i_diskflags |= GFS2_DIF_SYSTEM; 706 707 gfs2_set_inode_flags(inode); 708 709 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 710 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 711 aflags |= GFS2_AF_ORLOV; 712 713 if (default_acl || acl) 714 blocks++; 715 716 error = alloc_dinode(ip, aflags, &blocks); 717 if (error) 718 goto fail_free_inode; 719 720 gfs2_set_inode_blocks(inode, blocks); 721 722 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 723 if (error) 724 goto fail_free_inode; 725 flush_delayed_work(&ip->i_gl->gl_work); 726 glock_set_object(ip->i_gl, ip); 727 728 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 729 if (error) 730 goto fail_free_inode; 731 gfs2_cancel_delete_work(io_gl); 732 glock_set_object(io_gl, ip); 733 734 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 735 if (error) 736 goto fail_gunlock2; 737 738 error = gfs2_trans_begin(sdp, blocks, 0); 739 if (error) 740 goto fail_gunlock2; 741 742 if (blocks > 1) { 743 ip->i_eattr = ip->i_no_addr + 1; 744 gfs2_init_xattr(ip); 745 } 746 init_dinode(dip, ip, symname); 747 gfs2_trans_end(sdp); 748 749 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags)); 750 751 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 752 if (error) 753 goto fail_gunlock2; 754 755 gfs2_set_iop(inode); 756 insert_inode_hash(inode); 757 758 free_vfs_inode = 0; /* After this point, the inode is no longer 759 considered free. Any failures need to undo 760 the gfs2 structures. */ 761 if (default_acl) { 762 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 763 if (error) 764 goto fail_gunlock3; 765 posix_acl_release(default_acl); 766 default_acl = NULL; 767 } 768 if (acl) { 769 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 770 if (error) 771 goto fail_gunlock3; 772 posix_acl_release(acl); 773 acl = NULL; 774 } 775 776 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 777 &gfs2_initxattrs, NULL); 778 if (error) 779 goto fail_gunlock3; 780 781 error = link_dinode(dip, name, ip, &da); 782 if (error) 783 goto fail_gunlock3; 784 785 mark_inode_dirty(inode); 786 d_instantiate(dentry, inode); 787 /* After instantiate, errors should result in evict which will destroy 788 * both inode and iopen glocks properly. */ 789 if (file) { 790 file->f_mode |= FMODE_CREATED; 791 error = finish_open(file, dentry, gfs2_open_common); 792 } 793 gfs2_glock_dq_uninit(ghs); 794 gfs2_qa_put(ip); 795 gfs2_glock_dq_uninit(ghs + 1); 796 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags); 797 gfs2_glock_put(io_gl); 798 gfs2_qa_put(dip); 799 return error; 800 801fail_gunlock3: 802 glock_clear_object(io_gl, ip); 803 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 804fail_gunlock2: 805 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags); 806 glock_clear_object(io_gl, ip); 807 gfs2_glock_put(io_gl); 808fail_free_inode: 809 if (ip->i_gl) { 810 glock_clear_object(ip->i_gl, ip); 811 if (free_vfs_inode) /* else evict will do the put for us */ 812 gfs2_glock_put(ip->i_gl); 813 } 814 gfs2_rs_deltree(&ip->i_res); 815 gfs2_qa_put(ip); 816fail_free_acls: 817 posix_acl_release(default_acl); 818 posix_acl_release(acl); 819fail_gunlock: 820 gfs2_dir_no_add(&da); 821 gfs2_glock_dq_uninit(ghs); 822 if (!IS_ERR_OR_NULL(inode)) { 823 clear_nlink(inode); 824 if (!free_vfs_inode) 825 mark_inode_dirty(inode); 826 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 827 &GFS2_I(inode)->i_flags); 828 iput(inode); 829 } 830 if (gfs2_holder_initialized(ghs + 1)) 831 gfs2_glock_dq_uninit(ghs + 1); 832fail: 833 gfs2_qa_put(dip); 834 return error; 835} 836 837/** 838 * gfs2_create - Create a file 839 * @dir: The directory in which to create the file 840 * @dentry: The dentry of the new file 841 * @mode: The mode of the new file 842 * 843 * Returns: errno 844 */ 845 846static int gfs2_create(struct inode *dir, struct dentry *dentry, 847 umode_t mode, bool excl) 848{ 849 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); 850} 851 852/** 853 * __gfs2_lookup - Look up a filename in a directory and return its inode 854 * @dir: The directory inode 855 * @dentry: The dentry of the new inode 856 * @file: File to be opened 857 * 858 * 859 * Returns: errno 860 */ 861 862static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 863 struct file *file) 864{ 865 struct inode *inode; 866 struct dentry *d; 867 struct gfs2_holder gh; 868 struct gfs2_glock *gl; 869 int error; 870 871 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 872 if (inode == NULL) { 873 d_add(dentry, NULL); 874 return NULL; 875 } 876 if (IS_ERR(inode)) 877 return ERR_CAST(inode); 878 879 gl = GFS2_I(inode)->i_gl; 880 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 881 if (error) { 882 iput(inode); 883 return ERR_PTR(error); 884 } 885 886 d = d_splice_alias(inode, dentry); 887 if (IS_ERR(d)) { 888 gfs2_glock_dq_uninit(&gh); 889 return d; 890 } 891 if (file && S_ISREG(inode->i_mode)) 892 error = finish_open(file, dentry, gfs2_open_common); 893 894 gfs2_glock_dq_uninit(&gh); 895 if (error) { 896 dput(d); 897 return ERR_PTR(error); 898 } 899 return d; 900} 901 902static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 903 unsigned flags) 904{ 905 return __gfs2_lookup(dir, dentry, NULL); 906} 907 908/** 909 * gfs2_link - Link to a file 910 * @old_dentry: The inode to link 911 * @dir: Add link to this directory 912 * @dentry: The name of the link 913 * 914 * Link the inode in "old_dentry" into the directory "dir" with the 915 * name in "dentry". 916 * 917 * Returns: errno 918 */ 919 920static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 921 struct dentry *dentry) 922{ 923 struct gfs2_inode *dip = GFS2_I(dir); 924 struct gfs2_sbd *sdp = GFS2_SB(dir); 925 struct inode *inode = d_inode(old_dentry); 926 struct gfs2_inode *ip = GFS2_I(inode); 927 struct gfs2_holder ghs[2]; 928 struct buffer_head *dibh; 929 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 930 int error; 931 932 if (S_ISDIR(inode->i_mode)) 933 return -EPERM; 934 935 error = gfs2_qa_get(dip); 936 if (error) 937 return error; 938 939 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 940 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 941 942 error = gfs2_glock_nq(ghs); /* parent */ 943 if (error) 944 goto out_parent; 945 946 error = gfs2_glock_nq(ghs + 1); /* child */ 947 if (error) 948 goto out_child; 949 950 error = -ENOENT; 951 if (inode->i_nlink == 0) 952 goto out_gunlock; 953 954 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 955 if (error) 956 goto out_gunlock; 957 958 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 959 switch (error) { 960 case -ENOENT: 961 break; 962 case 0: 963 error = -EEXIST; 964 default: 965 goto out_gunlock; 966 } 967 968 error = -EINVAL; 969 if (!dip->i_inode.i_nlink) 970 goto out_gunlock; 971 error = -EFBIG; 972 if (dip->i_entries == (u32)-1) 973 goto out_gunlock; 974 error = -EPERM; 975 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 976 goto out_gunlock; 977 error = -EINVAL; 978 if (!ip->i_inode.i_nlink) 979 goto out_gunlock; 980 error = -EMLINK; 981 if (ip->i_inode.i_nlink == (u32)-1) 982 goto out_gunlock; 983 984 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 985 if (error < 0) 986 goto out_gunlock; 987 988 if (da.nr_blocks) { 989 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 990 error = gfs2_quota_lock_check(dip, &ap); 991 if (error) 992 goto out_gunlock; 993 994 error = gfs2_inplace_reserve(dip, &ap); 995 if (error) 996 goto out_gunlock_q; 997 998 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 999 if (error) 1000 goto out_ipres; 1001 } else { 1002 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 1003 if (error) 1004 goto out_ipres; 1005 } 1006 1007 error = gfs2_meta_inode_buffer(ip, &dibh); 1008 if (error) 1009 goto out_end_trans; 1010 1011 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 1012 if (error) 1013 goto out_brelse; 1014 1015 gfs2_trans_add_meta(ip->i_gl, dibh); 1016 inc_nlink(&ip->i_inode); 1017 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1018 ihold(inode); 1019 d_instantiate(dentry, inode); 1020 mark_inode_dirty(inode); 1021 1022out_brelse: 1023 brelse(dibh); 1024out_end_trans: 1025 gfs2_trans_end(sdp); 1026out_ipres: 1027 if (da.nr_blocks) 1028 gfs2_inplace_release(dip); 1029out_gunlock_q: 1030 if (da.nr_blocks) 1031 gfs2_quota_unlock(dip); 1032out_gunlock: 1033 gfs2_dir_no_add(&da); 1034 gfs2_glock_dq(ghs + 1); 1035out_child: 1036 gfs2_glock_dq(ghs); 1037out_parent: 1038 gfs2_qa_put(dip); 1039 gfs2_holder_uninit(ghs); 1040 gfs2_holder_uninit(ghs + 1); 1041 return error; 1042} 1043 1044/* 1045 * gfs2_unlink_ok - check to see that a inode is still in a directory 1046 * @dip: the directory 1047 * @name: the name of the file 1048 * @ip: the inode 1049 * 1050 * Assumes that the lock on (at least) @dip is held. 1051 * 1052 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1053 */ 1054 1055static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1056 const struct gfs2_inode *ip) 1057{ 1058 int error; 1059 1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1061 return -EPERM; 1062 1063 if ((dip->i_inode.i_mode & S_ISVTX) && 1064 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1065 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1066 return -EPERM; 1067 1068 if (IS_APPEND(&dip->i_inode)) 1069 return -EPERM; 1070 1071 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1072 if (error) 1073 return error; 1074 1075 return gfs2_dir_check(&dip->i_inode, name, ip); 1076} 1077 1078/** 1079 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1080 * @dip: The parent directory 1081 * @name: The name of the entry in the parent directory 1082 * @inode: The inode to be removed 1083 * 1084 * Called with all the locks and in a transaction. This will only be 1085 * called for a directory after it has been checked to ensure it is empty. 1086 * 1087 * Returns: 0 on success, or an error 1088 */ 1089 1090static int gfs2_unlink_inode(struct gfs2_inode *dip, 1091 const struct dentry *dentry) 1092{ 1093 struct inode *inode = d_inode(dentry); 1094 struct gfs2_inode *ip = GFS2_I(inode); 1095 int error; 1096 1097 error = gfs2_dir_del(dip, dentry); 1098 if (error) 1099 return error; 1100 1101 ip->i_entries = 0; 1102 inode->i_ctime = current_time(inode); 1103 if (S_ISDIR(inode->i_mode)) 1104 clear_nlink(inode); 1105 else 1106 drop_nlink(inode); 1107 mark_inode_dirty(inode); 1108 if (inode->i_nlink == 0) 1109 gfs2_unlink_di(inode); 1110 return 0; 1111} 1112 1113 1114/** 1115 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1116 * @dir: The inode of the directory containing the inode to unlink 1117 * @dentry: The file itself 1118 * 1119 * This routine uses the type of the inode as a flag to figure out 1120 * whether this is an unlink or an rmdir. 1121 * 1122 * Returns: errno 1123 */ 1124 1125static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1126{ 1127 struct gfs2_inode *dip = GFS2_I(dir); 1128 struct gfs2_sbd *sdp = GFS2_SB(dir); 1129 struct inode *inode = d_inode(dentry); 1130 struct gfs2_inode *ip = GFS2_I(inode); 1131 struct gfs2_holder ghs[3]; 1132 struct gfs2_rgrpd *rgd; 1133 int error; 1134 1135 error = gfs2_rindex_update(sdp); 1136 if (error) 1137 return error; 1138 1139 error = -EROFS; 1140 1141 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1142 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1143 1144 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1145 if (!rgd) 1146 goto out_inodes; 1147 1148 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1149 1150 1151 error = gfs2_glock_nq(ghs); /* parent */ 1152 if (error) 1153 goto out_parent; 1154 1155 error = gfs2_glock_nq(ghs + 1); /* child */ 1156 if (error) 1157 goto out_child; 1158 1159 error = -ENOENT; 1160 if (inode->i_nlink == 0) 1161 goto out_rgrp; 1162 1163 if (S_ISDIR(inode->i_mode)) { 1164 error = -ENOTEMPTY; 1165 if (ip->i_entries > 2 || inode->i_nlink > 2) 1166 goto out_rgrp; 1167 } 1168 1169 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1170 if (error) 1171 goto out_rgrp; 1172 1173 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1174 if (error) 1175 goto out_gunlock; 1176 1177 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1178 if (error) 1179 goto out_gunlock; 1180 1181 error = gfs2_unlink_inode(dip, dentry); 1182 gfs2_trans_end(sdp); 1183 1184out_gunlock: 1185 gfs2_glock_dq(ghs + 2); 1186out_rgrp: 1187 gfs2_glock_dq(ghs + 1); 1188out_child: 1189 gfs2_glock_dq(ghs); 1190out_parent: 1191 gfs2_holder_uninit(ghs + 2); 1192out_inodes: 1193 gfs2_holder_uninit(ghs + 1); 1194 gfs2_holder_uninit(ghs); 1195 return error; 1196} 1197 1198/** 1199 * gfs2_symlink - Create a symlink 1200 * @dir: The directory to create the symlink in 1201 * @dentry: The dentry to put the symlink in 1202 * @symname: The thing which the link points to 1203 * 1204 * Returns: errno 1205 */ 1206 1207static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1208 const char *symname) 1209{ 1210 unsigned int size; 1211 1212 size = strlen(symname); 1213 if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) 1214 return -ENAMETOOLONG; 1215 1216 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1217} 1218 1219/** 1220 * gfs2_mkdir - Make a directory 1221 * @dir: The parent directory of the new one 1222 * @dentry: The dentry of the new directory 1223 * @mode: The mode of the new directory 1224 * 1225 * Returns: errno 1226 */ 1227 1228static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1229{ 1230 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); 1231 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); 1232} 1233 1234/** 1235 * gfs2_mknod - Make a special file 1236 * @dir: The directory in which the special file will reside 1237 * @dentry: The dentry of the special file 1238 * @mode: The mode of the special file 1239 * @dev: The device specification of the special file 1240 * 1241 */ 1242 1243static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1244 dev_t dev) 1245{ 1246 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); 1247} 1248 1249/** 1250 * gfs2_atomic_open - Atomically open a file 1251 * @dir: The directory 1252 * @dentry: The proposed new entry 1253 * @file: The proposed new struct file 1254 * @flags: open flags 1255 * @mode: File mode 1256 * 1257 * Returns: error code or 0 for success 1258 */ 1259 1260static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1261 struct file *file, unsigned flags, 1262 umode_t mode) 1263{ 1264 struct dentry *d; 1265 bool excl = !!(flags & O_EXCL); 1266 1267 if (!d_in_lookup(dentry)) 1268 goto skip_lookup; 1269 1270 d = __gfs2_lookup(dir, dentry, file); 1271 if (IS_ERR(d)) 1272 return PTR_ERR(d); 1273 if (d != NULL) 1274 dentry = d; 1275 if (d_really_is_positive(dentry)) { 1276 if (!(file->f_mode & FMODE_OPENED)) 1277 return finish_no_open(file, d); 1278 dput(d); 1279 return excl && (flags & O_CREAT) ? -EEXIST : 0; 1280 } 1281 1282 BUG_ON(d != NULL); 1283 1284skip_lookup: 1285 if (!(flags & O_CREAT)) 1286 return -ENOENT; 1287 1288 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); 1289} 1290 1291/* 1292 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1293 * @this: move this 1294 * @to: to here 1295 * 1296 * Follow @to back to the root and make sure we don't encounter @this 1297 * Assumes we already hold the rename lock. 1298 * 1299 * Returns: errno 1300 */ 1301 1302static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1303{ 1304 struct inode *dir = &to->i_inode; 1305 struct super_block *sb = dir->i_sb; 1306 struct inode *tmp; 1307 int error = 0; 1308 1309 igrab(dir); 1310 1311 for (;;) { 1312 if (dir == &this->i_inode) { 1313 error = -EINVAL; 1314 break; 1315 } 1316 if (dir == d_inode(sb->s_root)) { 1317 error = 0; 1318 break; 1319 } 1320 1321 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1322 if (!tmp) { 1323 error = -ENOENT; 1324 break; 1325 } 1326 if (IS_ERR(tmp)) { 1327 error = PTR_ERR(tmp); 1328 break; 1329 } 1330 1331 iput(dir); 1332 dir = tmp; 1333 } 1334 1335 iput(dir); 1336 1337 return error; 1338} 1339 1340/** 1341 * update_moved_ino - Update an inode that's being moved 1342 * @ip: The inode being moved 1343 * @ndip: The parent directory of the new filename 1344 * @dir_rename: True of ip is a directory 1345 * 1346 * Returns: errno 1347 */ 1348 1349static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, 1350 int dir_rename) 1351{ 1352 if (dir_rename) 1353 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1354 1355 ip->i_inode.i_ctime = current_time(&ip->i_inode); 1356 mark_inode_dirty_sync(&ip->i_inode); 1357 return 0; 1358} 1359 1360 1361/** 1362 * gfs2_rename - Rename a file 1363 * @odir: Parent directory of old file name 1364 * @odentry: The old dentry of the file 1365 * @ndir: Parent directory of new file name 1366 * @ndentry: The new dentry of the file 1367 * 1368 * Returns: errno 1369 */ 1370 1371static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1372 struct inode *ndir, struct dentry *ndentry) 1373{ 1374 struct gfs2_inode *odip = GFS2_I(odir); 1375 struct gfs2_inode *ndip = GFS2_I(ndir); 1376 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1377 struct gfs2_inode *nip = NULL; 1378 struct gfs2_sbd *sdp = GFS2_SB(odir); 1379 struct gfs2_holder ghs[4], r_gh, rd_gh; 1380 struct gfs2_rgrpd *nrgd; 1381 unsigned int num_gh; 1382 int dir_rename = 0; 1383 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1384 unsigned int x; 1385 int error; 1386 1387 gfs2_holder_mark_uninitialized(&r_gh); 1388 gfs2_holder_mark_uninitialized(&rd_gh); 1389 if (d_really_is_positive(ndentry)) { 1390 nip = GFS2_I(d_inode(ndentry)); 1391 if (ip == nip) 1392 return 0; 1393 } 1394 1395 error = gfs2_rindex_update(sdp); 1396 if (error) 1397 return error; 1398 1399 error = gfs2_qa_get(ndip); 1400 if (error) 1401 return error; 1402 1403 if (odip != ndip) { 1404 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1405 0, &r_gh); 1406 if (error) 1407 goto out; 1408 1409 if (S_ISDIR(ip->i_inode.i_mode)) { 1410 dir_rename = 1; 1411 /* don't move a directory into its subdir */ 1412 error = gfs2_ok_to_move(ip, ndip); 1413 if (error) 1414 goto out_gunlock_r; 1415 } 1416 } 1417 1418 num_gh = 1; 1419 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1420 if (odip != ndip) { 1421 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, 1422 ghs + num_gh); 1423 num_gh++; 1424 } 1425 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1426 num_gh++; 1427 1428 if (nip) { 1429 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1430 ghs + num_gh); 1431 num_gh++; 1432 } 1433 1434 for (x = 0; x < num_gh; x++) { 1435 error = gfs2_glock_nq(ghs + x); 1436 if (error) 1437 goto out_gunlock; 1438 } 1439 error = gfs2_glock_async_wait(num_gh, ghs); 1440 if (error) 1441 goto out_gunlock; 1442 1443 if (nip) { 1444 /* Grab the resource group glock for unlink flag twiddling. 1445 * This is the case where the target dinode already exists 1446 * so we unlink before doing the rename. 1447 */ 1448 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1449 if (!nrgd) { 1450 error = -ENOENT; 1451 goto out_gunlock; 1452 } 1453 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, 1454 &rd_gh); 1455 if (error) 1456 goto out_gunlock; 1457 } 1458 1459 error = -ENOENT; 1460 if (ip->i_inode.i_nlink == 0) 1461 goto out_gunlock; 1462 1463 /* Check out the old directory */ 1464 1465 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1466 if (error) 1467 goto out_gunlock; 1468 1469 /* Check out the new directory */ 1470 1471 if (nip) { 1472 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1473 if (error) 1474 goto out_gunlock; 1475 1476 if (nip->i_inode.i_nlink == 0) { 1477 error = -EAGAIN; 1478 goto out_gunlock; 1479 } 1480 1481 if (S_ISDIR(nip->i_inode.i_mode)) { 1482 if (nip->i_entries < 2) { 1483 gfs2_consist_inode(nip); 1484 error = -EIO; 1485 goto out_gunlock; 1486 } 1487 if (nip->i_entries > 2) { 1488 error = -ENOTEMPTY; 1489 goto out_gunlock; 1490 } 1491 } 1492 } else { 1493 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1494 if (error) 1495 goto out_gunlock; 1496 1497 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1498 switch (error) { 1499 case -ENOENT: 1500 error = 0; 1501 break; 1502 case 0: 1503 error = -EEXIST; 1504 default: 1505 goto out_gunlock; 1506 } 1507 1508 if (odip != ndip) { 1509 if (!ndip->i_inode.i_nlink) { 1510 error = -ENOENT; 1511 goto out_gunlock; 1512 } 1513 if (ndip->i_entries == (u32)-1) { 1514 error = -EFBIG; 1515 goto out_gunlock; 1516 } 1517 if (S_ISDIR(ip->i_inode.i_mode) && 1518 ndip->i_inode.i_nlink == (u32)-1) { 1519 error = -EMLINK; 1520 goto out_gunlock; 1521 } 1522 } 1523 } 1524 1525 /* Check out the dir to be renamed */ 1526 1527 if (dir_rename) { 1528 error = gfs2_permission(d_inode(odentry), MAY_WRITE); 1529 if (error) 1530 goto out_gunlock; 1531 } 1532 1533 if (nip == NULL) { 1534 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1535 if (error) 1536 goto out_gunlock; 1537 } 1538 1539 if (da.nr_blocks) { 1540 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1541 error = gfs2_quota_lock_check(ndip, &ap); 1542 if (error) 1543 goto out_gunlock; 1544 1545 error = gfs2_inplace_reserve(ndip, &ap); 1546 if (error) 1547 goto out_gunlock_q; 1548 1549 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1550 4 * RES_LEAF + 4, 0); 1551 if (error) 1552 goto out_ipreserv; 1553 } else { 1554 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1555 5 * RES_LEAF + 4, 0); 1556 if (error) 1557 goto out_gunlock; 1558 } 1559 1560 /* Remove the target file, if it exists */ 1561 1562 if (nip) 1563 error = gfs2_unlink_inode(ndip, ndentry); 1564 1565 error = update_moved_ino(ip, ndip, dir_rename); 1566 if (error) 1567 goto out_end_trans; 1568 1569 error = gfs2_dir_del(odip, odentry); 1570 if (error) 1571 goto out_end_trans; 1572 1573 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1574 if (error) 1575 goto out_end_trans; 1576 1577out_end_trans: 1578 gfs2_trans_end(sdp); 1579out_ipreserv: 1580 if (da.nr_blocks) 1581 gfs2_inplace_release(ndip); 1582out_gunlock_q: 1583 if (da.nr_blocks) 1584 gfs2_quota_unlock(ndip); 1585out_gunlock: 1586 gfs2_dir_no_add(&da); 1587 if (gfs2_holder_initialized(&rd_gh)) 1588 gfs2_glock_dq_uninit(&rd_gh); 1589 1590 while (x--) { 1591 if (gfs2_holder_queued(ghs + x)) 1592 gfs2_glock_dq(ghs + x); 1593 gfs2_holder_uninit(ghs + x); 1594 } 1595out_gunlock_r: 1596 if (gfs2_holder_initialized(&r_gh)) 1597 gfs2_glock_dq_uninit(&r_gh); 1598out: 1599 gfs2_qa_put(ndip); 1600 return error; 1601} 1602 1603/** 1604 * gfs2_exchange - exchange two files 1605 * @odir: Parent directory of old file name 1606 * @odentry: The old dentry of the file 1607 * @ndir: Parent directory of new file name 1608 * @ndentry: The new dentry of the file 1609 * @flags: The rename flags 1610 * 1611 * Returns: errno 1612 */ 1613 1614static int gfs2_exchange(struct inode *odir, struct dentry *odentry, 1615 struct inode *ndir, struct dentry *ndentry, 1616 unsigned int flags) 1617{ 1618 struct gfs2_inode *odip = GFS2_I(odir); 1619 struct gfs2_inode *ndip = GFS2_I(ndir); 1620 struct gfs2_inode *oip = GFS2_I(odentry->d_inode); 1621 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); 1622 struct gfs2_sbd *sdp = GFS2_SB(odir); 1623 struct gfs2_holder ghs[4], r_gh; 1624 unsigned int num_gh; 1625 unsigned int x; 1626 umode_t old_mode = oip->i_inode.i_mode; 1627 umode_t new_mode = nip->i_inode.i_mode; 1628 int error; 1629 1630 gfs2_holder_mark_uninitialized(&r_gh); 1631 error = gfs2_rindex_update(sdp); 1632 if (error) 1633 return error; 1634 1635 if (odip != ndip) { 1636 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1637 0, &r_gh); 1638 if (error) 1639 goto out; 1640 1641 if (S_ISDIR(old_mode)) { 1642 /* don't move a directory into its subdir */ 1643 error = gfs2_ok_to_move(oip, ndip); 1644 if (error) 1645 goto out_gunlock_r; 1646 } 1647 1648 if (S_ISDIR(new_mode)) { 1649 /* don't move a directory into its subdir */ 1650 error = gfs2_ok_to_move(nip, odip); 1651 if (error) 1652 goto out_gunlock_r; 1653 } 1654 } 1655 1656 num_gh = 1; 1657 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); 1658 if (odip != ndip) { 1659 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, 1660 ghs + num_gh); 1661 num_gh++; 1662 } 1663 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1664 num_gh++; 1665 1666 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); 1667 num_gh++; 1668 1669 for (x = 0; x < num_gh; x++) { 1670 error = gfs2_glock_nq(ghs + x); 1671 if (error) 1672 goto out_gunlock; 1673 } 1674 1675 error = gfs2_glock_async_wait(num_gh, ghs); 1676 if (error) 1677 goto out_gunlock; 1678 1679 error = -ENOENT; 1680 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) 1681 goto out_gunlock; 1682 1683 error = gfs2_unlink_ok(odip, &odentry->d_name, oip); 1684 if (error) 1685 goto out_gunlock; 1686 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1687 if (error) 1688 goto out_gunlock; 1689 1690 if (S_ISDIR(old_mode)) { 1691 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1692 if (error) 1693 goto out_gunlock; 1694 } 1695 if (S_ISDIR(new_mode)) { 1696 error = gfs2_permission(ndentry->d_inode, MAY_WRITE); 1697 if (error) 1698 goto out_gunlock; 1699 } 1700 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); 1701 if (error) 1702 goto out_gunlock; 1703 1704 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); 1705 if (error) 1706 goto out_end_trans; 1707 1708 error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); 1709 if (error) 1710 goto out_end_trans; 1711 1712 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, 1713 IF2DT(old_mode)); 1714 if (error) 1715 goto out_end_trans; 1716 1717 error = gfs2_dir_mvino(odip, &odentry->d_name, nip, 1718 IF2DT(new_mode)); 1719 if (error) 1720 goto out_end_trans; 1721 1722 if (odip != ndip) { 1723 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { 1724 inc_nlink(&odip->i_inode); 1725 drop_nlink(&ndip->i_inode); 1726 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { 1727 inc_nlink(&ndip->i_inode); 1728 drop_nlink(&odip->i_inode); 1729 } 1730 } 1731 mark_inode_dirty(&ndip->i_inode); 1732 if (odip != ndip) 1733 mark_inode_dirty(&odip->i_inode); 1734 1735out_end_trans: 1736 gfs2_trans_end(sdp); 1737out_gunlock: 1738 while (x--) { 1739 if (gfs2_holder_queued(ghs + x)) 1740 gfs2_glock_dq(ghs + x); 1741 gfs2_holder_uninit(ghs + x); 1742 } 1743out_gunlock_r: 1744 if (gfs2_holder_initialized(&r_gh)) 1745 gfs2_glock_dq_uninit(&r_gh); 1746out: 1747 return error; 1748} 1749 1750static int gfs2_rename2(struct inode *odir, struct dentry *odentry, 1751 struct inode *ndir, struct dentry *ndentry, 1752 unsigned int flags) 1753{ 1754 flags &= ~RENAME_NOREPLACE; 1755 1756 if (flags & ~RENAME_EXCHANGE) 1757 return -EINVAL; 1758 1759 if (flags & RENAME_EXCHANGE) 1760 return gfs2_exchange(odir, odentry, ndir, ndentry, flags); 1761 1762 return gfs2_rename(odir, odentry, ndir, ndentry); 1763} 1764 1765/** 1766 * gfs2_get_link - Follow a symbolic link 1767 * @dentry: The dentry of the link 1768 * @inode: The inode of the link 1769 * @done: destructor for return value 1770 * 1771 * This can handle symlinks of any size. 1772 * 1773 * Returns: 0 on success or error code 1774 */ 1775 1776static const char *gfs2_get_link(struct dentry *dentry, 1777 struct inode *inode, 1778 struct delayed_call *done) 1779{ 1780 struct gfs2_inode *ip = GFS2_I(inode); 1781 struct gfs2_holder i_gh; 1782 struct buffer_head *dibh; 1783 unsigned int size; 1784 char *buf; 1785 int error; 1786 1787 if (!dentry) 1788 return ERR_PTR(-ECHILD); 1789 1790 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1791 error = gfs2_glock_nq(&i_gh); 1792 if (error) { 1793 gfs2_holder_uninit(&i_gh); 1794 return ERR_PTR(error); 1795 } 1796 1797 size = (unsigned int)i_size_read(&ip->i_inode); 1798 if (size == 0) { 1799 gfs2_consist_inode(ip); 1800 buf = ERR_PTR(-EIO); 1801 goto out; 1802 } 1803 1804 error = gfs2_meta_inode_buffer(ip, &dibh); 1805 if (error) { 1806 buf = ERR_PTR(error); 1807 goto out; 1808 } 1809 1810 buf = kzalloc(size + 1, GFP_NOFS); 1811 if (!buf) 1812 buf = ERR_PTR(-ENOMEM); 1813 else 1814 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1815 brelse(dibh); 1816out: 1817 gfs2_glock_dq_uninit(&i_gh); 1818 if (!IS_ERR(buf)) 1819 set_delayed_call(done, kfree_link, buf); 1820 return buf; 1821} 1822 1823/** 1824 * gfs2_permission - 1825 * @inode: The inode 1826 * @mask: The mask to be tested 1827 * @flags: Indicates whether this is an RCU path walk or not 1828 * 1829 * This may be called from the VFS directly, or from within GFS2 with the 1830 * inode locked, so we look to see if the glock is already locked and only 1831 * lock the glock if its not already been done. 1832 * 1833 * Returns: errno 1834 */ 1835 1836int gfs2_permission(struct inode *inode, int mask) 1837{ 1838 int may_not_block = mask & MAY_NOT_BLOCK; 1839 struct gfs2_inode *ip; 1840 struct gfs2_holder i_gh; 1841 struct gfs2_glock *gl; 1842 int error; 1843 1844 gfs2_holder_mark_uninitialized(&i_gh); 1845 ip = GFS2_I(inode); 1846 gl = rcu_dereference_check(ip->i_gl, !may_not_block); 1847 if (unlikely(!gl)) { 1848 /* inode is getting torn down, must be RCU mode */ 1849 WARN_ON_ONCE(!may_not_block); 1850 return -ECHILD; 1851 } 1852 if (gfs2_glock_is_locked_by_me(gl) == NULL) { 1853 if (may_not_block) 1854 return -ECHILD; 1855 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1856 if (error) 1857 return error; 1858 } 1859 1860 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1861 error = -EPERM; 1862 else 1863 error = generic_permission(inode, mask); 1864 if (gfs2_holder_initialized(&i_gh)) 1865 gfs2_glock_dq_uninit(&i_gh); 1866 1867 return error; 1868} 1869 1870static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1871{ 1872 setattr_copy(inode, attr); 1873 mark_inode_dirty(inode); 1874 return 0; 1875} 1876 1877/** 1878 * gfs2_setattr_simple - 1879 * @ip: 1880 * @attr: 1881 * 1882 * Returns: errno 1883 */ 1884 1885int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1886{ 1887 int error; 1888 1889 if (current->journal_info) 1890 return __gfs2_setattr_simple(inode, attr); 1891 1892 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1893 if (error) 1894 return error; 1895 1896 error = __gfs2_setattr_simple(inode, attr); 1897 gfs2_trans_end(GFS2_SB(inode)); 1898 return error; 1899} 1900 1901static int setattr_chown(struct inode *inode, struct iattr *attr) 1902{ 1903 struct gfs2_inode *ip = GFS2_I(inode); 1904 struct gfs2_sbd *sdp = GFS2_SB(inode); 1905 kuid_t ouid, nuid; 1906 kgid_t ogid, ngid; 1907 int error; 1908 struct gfs2_alloc_parms ap; 1909 1910 ouid = inode->i_uid; 1911 ogid = inode->i_gid; 1912 nuid = attr->ia_uid; 1913 ngid = attr->ia_gid; 1914 1915 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1916 ouid = nuid = NO_UID_QUOTA_CHANGE; 1917 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1918 ogid = ngid = NO_GID_QUOTA_CHANGE; 1919 error = gfs2_qa_get(ip); 1920 if (error) 1921 return error; 1922 1923 error = gfs2_rindex_update(sdp); 1924 if (error) 1925 goto out; 1926 1927 error = gfs2_quota_lock(ip, nuid, ngid); 1928 if (error) 1929 goto out; 1930 1931 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 1932 1933 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1934 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1935 error = gfs2_quota_check(ip, nuid, ngid, &ap); 1936 if (error) 1937 goto out_gunlock_q; 1938 } 1939 1940 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1941 if (error) 1942 goto out_gunlock_q; 1943 1944 error = gfs2_setattr_simple(inode, attr); 1945 if (error) 1946 goto out_end_trans; 1947 1948 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1949 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1950 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); 1951 gfs2_quota_change(ip, ap.target, nuid, ngid); 1952 } 1953 1954out_end_trans: 1955 gfs2_trans_end(sdp); 1956out_gunlock_q: 1957 gfs2_quota_unlock(ip); 1958out: 1959 gfs2_qa_put(ip); 1960 return error; 1961} 1962 1963/** 1964 * gfs2_setattr - Change attributes on an inode 1965 * @dentry: The dentry which is changing 1966 * @attr: The structure describing the change 1967 * 1968 * The VFS layer wants to change one or more of an inodes attributes. Write 1969 * that change out to disk. 1970 * 1971 * Returns: errno 1972 */ 1973 1974static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1975{ 1976 struct inode *inode = d_inode(dentry); 1977 struct gfs2_inode *ip = GFS2_I(inode); 1978 struct gfs2_holder i_gh; 1979 int error; 1980 1981 error = gfs2_qa_get(ip); 1982 if (error) 1983 return error; 1984 1985 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1986 if (error) 1987 goto out; 1988 1989 error = -EPERM; 1990 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1991 goto error; 1992 1993 error = setattr_prepare(dentry, attr); 1994 if (error) 1995 goto error; 1996 1997 if (attr->ia_valid & ATTR_SIZE) 1998 error = gfs2_setattr_size(inode, attr->ia_size); 1999 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 2000 error = setattr_chown(inode, attr); 2001 else { 2002 error = gfs2_setattr_simple(inode, attr); 2003 if (!error && attr->ia_valid & ATTR_MODE) 2004 error = posix_acl_chmod(inode, inode->i_mode); 2005 } 2006 2007error: 2008 if (!error) 2009 mark_inode_dirty(inode); 2010 gfs2_glock_dq_uninit(&i_gh); 2011out: 2012 gfs2_qa_put(ip); 2013 return error; 2014} 2015 2016/** 2017 * gfs2_getattr - Read out an inode's attributes 2018 * @path: Object to query 2019 * @stat: The inode's stats 2020 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 2021 * @flags: AT_STATX_xxx setting 2022 * 2023 * This may be called from the VFS directly, or from within GFS2 with the 2024 * inode locked, so we look to see if the glock is already locked and only 2025 * lock the glock if its not already been done. Note that its the NFS 2026 * readdirplus operation which causes this to be called (from filldir) 2027 * with the glock already held. 2028 * 2029 * Returns: errno 2030 */ 2031 2032static int gfs2_getattr(const struct path *path, struct kstat *stat, 2033 u32 request_mask, unsigned int flags) 2034{ 2035 struct inode *inode = d_inode(path->dentry); 2036 struct gfs2_inode *ip = GFS2_I(inode); 2037 struct gfs2_holder gh; 2038 u32 gfsflags; 2039 int error; 2040 2041 gfs2_holder_mark_uninitialized(&gh); 2042 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 2043 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 2044 if (error) 2045 return error; 2046 } 2047 2048 gfsflags = ip->i_diskflags; 2049 if (gfsflags & GFS2_DIF_APPENDONLY) 2050 stat->attributes |= STATX_ATTR_APPEND; 2051 if (gfsflags & GFS2_DIF_IMMUTABLE) 2052 stat->attributes |= STATX_ATTR_IMMUTABLE; 2053 2054 stat->attributes_mask |= (STATX_ATTR_APPEND | 2055 STATX_ATTR_COMPRESSED | 2056 STATX_ATTR_ENCRYPTED | 2057 STATX_ATTR_IMMUTABLE | 2058 STATX_ATTR_NODUMP); 2059 2060 generic_fillattr(inode, stat); 2061 2062 if (gfs2_holder_initialized(&gh)) 2063 gfs2_glock_dq_uninit(&gh); 2064 2065 return 0; 2066} 2067 2068static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 2069 u64 start, u64 len) 2070{ 2071 struct gfs2_inode *ip = GFS2_I(inode); 2072 struct gfs2_holder gh; 2073 int ret; 2074 2075 inode_lock_shared(inode); 2076 2077 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2078 if (ret) 2079 goto out; 2080 2081 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); 2082 2083 gfs2_glock_dq_uninit(&gh); 2084 2085out: 2086 inode_unlock_shared(inode); 2087 return ret; 2088} 2089 2090loff_t gfs2_seek_data(struct file *file, loff_t offset) 2091{ 2092 struct inode *inode = file->f_mapping->host; 2093 struct gfs2_inode *ip = GFS2_I(inode); 2094 struct gfs2_holder gh; 2095 loff_t ret; 2096 2097 inode_lock_shared(inode); 2098 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2099 if (!ret) 2100 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); 2101 gfs2_glock_dq_uninit(&gh); 2102 inode_unlock_shared(inode); 2103 2104 if (ret < 0) 2105 return ret; 2106 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2107} 2108 2109loff_t gfs2_seek_hole(struct file *file, loff_t offset) 2110{ 2111 struct inode *inode = file->f_mapping->host; 2112 struct gfs2_inode *ip = GFS2_I(inode); 2113 struct gfs2_holder gh; 2114 loff_t ret; 2115 2116 inode_lock_shared(inode); 2117 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 2118 if (!ret) 2119 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); 2120 gfs2_glock_dq_uninit(&gh); 2121 inode_unlock_shared(inode); 2122 2123 if (ret < 0) 2124 return ret; 2125 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); 2126} 2127 2128static int gfs2_update_time(struct inode *inode, struct timespec64 *time, 2129 int flags) 2130{ 2131 struct gfs2_inode *ip = GFS2_I(inode); 2132 struct gfs2_glock *gl = ip->i_gl; 2133 struct gfs2_holder *gh; 2134 int error; 2135 2136 gh = gfs2_glock_is_locked_by_me(gl); 2137 if (gh && !gfs2_glock_is_held_excl(gl)) { 2138 gfs2_glock_dq(gh); 2139 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); 2140 error = gfs2_glock_nq(gh); 2141 if (error) 2142 return error; 2143 } 2144 return generic_update_time(inode, time, flags); 2145} 2146 2147const struct inode_operations gfs2_file_iops = { 2148 .permission = gfs2_permission, 2149 .setattr = gfs2_setattr, 2150 .getattr = gfs2_getattr, 2151 .listxattr = gfs2_listxattr, 2152 .fiemap = gfs2_fiemap, 2153 .get_acl = gfs2_get_acl, 2154 .set_acl = gfs2_set_acl, 2155 .update_time = gfs2_update_time, 2156}; 2157 2158const struct inode_operations gfs2_dir_iops = { 2159 .create = gfs2_create, 2160 .lookup = gfs2_lookup, 2161 .link = gfs2_link, 2162 .unlink = gfs2_unlink, 2163 .symlink = gfs2_symlink, 2164 .mkdir = gfs2_mkdir, 2165 .rmdir = gfs2_unlink, 2166 .mknod = gfs2_mknod, 2167 .rename = gfs2_rename2, 2168 .permission = gfs2_permission, 2169 .setattr = gfs2_setattr, 2170 .getattr = gfs2_getattr, 2171 .listxattr = gfs2_listxattr, 2172 .fiemap = gfs2_fiemap, 2173 .get_acl = gfs2_get_acl, 2174 .set_acl = gfs2_set_acl, 2175 .update_time = gfs2_update_time, 2176 .atomic_open = gfs2_atomic_open, 2177}; 2178 2179const struct inode_operations gfs2_symlink_iops = { 2180 .get_link = gfs2_get_link, 2181 .permission = gfs2_permission, 2182 .setattr = gfs2_setattr, 2183 .getattr = gfs2_getattr, 2184 .listxattr = gfs2_listxattr, 2185 .fiemap = gfs2_fiemap, 2186}; 2187 2188