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