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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / fs / gfs2 / inode.c
blobc1b77e8d6b1c30735c5f2c6a974bc7cd81d6c82f
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
5 */
6
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/completion.h>
10 #include <linux/buffer_head.h>
11 #include <linux/namei.h>
12 #include <linux/mm.h>
13 #include <linux/cred.h>
14 #include <linux/xattr.h>
15 #include <linux/posix_acl.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/crc32.h>
18 #include <linux/iomap.h>
19 #include <linux/security.h>
20 #include <linux/fiemap.h>
21 #include <linux/uaccess.h>
22
23 #include "gfs2.h"
24 #include "incore.h"
25 #include "acl.h"
26 #include "bmap.h"
27 #include "dir.h"
28 #include "xattr.h"
29 #include "glock.h"
30 #include "inode.h"
31 #include "meta_io.h"
32 #include "quota.h"
33 #include "rgrp.h"
34 #include "trans.h"
35 #include "util.h"
36 #include "super.h"
37 #include "glops.h"
38
39 static const struct inode_operations gfs2_file_iops;
40 static const struct inode_operations gfs2_dir_iops;
41 static const struct inode_operations gfs2_symlink_iops;
42
43 static int iget_test(struct inode *inode, void *opaque)
44 {
45 u64 no_addr = *(u64 *)opaque;
46
47 return GFS2_I(inode)->i_no_addr == no_addr;
48 }
49
50 static int iget_set(struct inode *inode, void *opaque)
51 {
52 u64 no_addr = *(u64 *)opaque;
53
54 GFS2_I(inode)->i_no_addr = no_addr;
55 inode->i_ino = no_addr;
56 return 0;
57 }
58
59 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
60 {
61 struct inode *inode;
62
63 repeat:
64 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
65 if (!inode)
66 return inode;
67 if (is_bad_inode(inode)) {
68 iput(inode);
69 goto repeat;
70 }
71 return inode;
72 }
73
74 /**
75 * gfs2_set_iop - Sets inode operations
76 * @inode: The inode with correct i_mode filled in
77 *
78 * GFS2 lookup code fills in vfs inode contents based on info obtained
79 * from directory entry inside gfs2_inode_lookup().
80 */
81
82 static void gfs2_set_iop(struct inode *inode)
83 {
84 struct gfs2_sbd *sdp = GFS2_SB(inode);
85 umode_t mode = inode->i_mode;
86
87 if (S_ISREG(mode)) {
88 inode->i_op = &gfs2_file_iops;
89 if (gfs2_localflocks(sdp))
90 inode->i_fop = &gfs2_file_fops_nolock;
91 else
92 inode->i_fop = &gfs2_file_fops;
93 } else if (S_ISDIR(mode)) {
94 inode->i_op = &gfs2_dir_iops;
95 if (gfs2_localflocks(sdp))
96 inode->i_fop = &gfs2_dir_fops_nolock;
97 else
98 inode->i_fop = &gfs2_dir_fops;
99 } else if (S_ISLNK(mode)) {
100 inode->i_op = &gfs2_symlink_iops;
101 } else {
102 inode->i_op = &gfs2_file_iops;
103 init_special_inode(inode, inode->i_mode, inode->i_rdev);
104 }
105 }
106
107 /**
108 * gfs2_inode_lookup - Lookup an inode
109 * @sb: The super block
110 * @type: The type of the inode
111 * @no_addr: The inode number
112 * @no_formal_ino: The inode generation number
113 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
114 * GFS2_BLKST_FREE to indicate not to verify)
115 *
116 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
117 *
118 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
119 * placeholder because it doesn't otherwise make sense), the on-disk block type
120 * is verified to be @blktype.
121 *
122 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
123 * if it detects that @no_formal_ino doesn't match the actual inode generation
124 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
125 *
126 * Returns: A VFS inode, or an error
127 */
128
129 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
130 u64 no_addr, u64 no_formal_ino,
131 unsigned int blktype)
132 {
133 struct inode *inode;
134 struct gfs2_inode *ip;
135 struct gfs2_glock *io_gl = NULL;
136 struct gfs2_holder i_gh;
137 int error;
138
139 gfs2_holder_mark_uninitialized(&i_gh);
140 inode = gfs2_iget(sb, no_addr);
141 if (!inode)
142 return ERR_PTR(-ENOMEM);
143
144 ip = GFS2_I(inode);
145
146 if (inode->i_state & I_NEW) {
147 struct gfs2_sbd *sdp = GFS2_SB(inode);
148
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
150 if (unlikely(error))
151 goto fail;
152 flush_delayed_work(&ip->i_gl->gl_work);
153
154 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
155 if (unlikely(error))
156 goto fail;
157 if (blktype != GFS2_BLKST_UNLINKED)
158 gfs2_cancel_delete_work(io_gl);
159
160 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
161 /*
162 * The GL_SKIP flag indicates to skip reading the inode
163 * block. We read the inode with gfs2_inode_refresh
164 * after possibly checking the block type.
165 */
166 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
167 GL_SKIP, &i_gh);
168 if (error)
169 goto fail;
170
171 error = -ESTALE;
172 if (no_formal_ino &&
173 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
174 goto fail;
175
176 if (blktype != GFS2_BLKST_FREE) {
177 error = gfs2_check_blk_type(sdp, no_addr,
178 blktype);
179 if (error)
180 goto fail;
181 }
182 }
183
184 glock_set_object(ip->i_gl, ip);
185 set_bit(GIF_INVALID, &ip->i_flags);
186 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
187 if (unlikely(error))
188 goto fail;
189 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
190 gfs2_glock_put(io_gl);
191 io_gl = NULL;
192
193 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
194 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
195 inode->i_atime.tv_nsec = 0;
196
197 if (type == DT_UNKNOWN) {
198 /* Inode glock must be locked already */
199 error = gfs2_inode_refresh(GFS2_I(inode));
200 if (error)
201 goto fail;
202 } else {
203 ip->i_no_formal_ino = no_formal_ino;
204 inode->i_mode = DT2IF(type);
205 }
206
207 if (gfs2_holder_initialized(&i_gh))
208 gfs2_glock_dq_uninit(&i_gh);
209
210 gfs2_set_iop(inode);
211 }
212
213 if (no_formal_ino && ip->i_no_formal_ino &&
214 no_formal_ino != ip->i_no_formal_ino) {
215 error = -ESTALE;
216 if (inode->i_state & I_NEW)
217 goto fail;
218 iput(inode);
219 return ERR_PTR(error);
220 }
221
222 if (inode->i_state & I_NEW)
223 unlock_new_inode(inode);
224
225 return inode;
226
227 fail:
228 if (io_gl)
229 gfs2_glock_put(io_gl);
230 if (gfs2_holder_initialized(&i_gh))
231 gfs2_glock_dq_uninit(&i_gh);
232 iget_failed(inode);
233 return ERR_PTR(error);
234 }
235
236 /**
237 * gfs2_lookup_by_inum - look up an inode by inode number
238 * @sdp: The super block
239 * @no_addr: The inode number
240 * @no_formal_ino: The inode generation number (0 for any)
241 * @blktype: Requested block type (see gfs2_inode_lookup)
242 */
243 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
244 u64 no_formal_ino, unsigned int blktype)
245 {
246 struct super_block *sb = sdp->sd_vfs;
247 struct inode *inode;
248 int error;
249
250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
251 blktype);
252 if (IS_ERR(inode))
253 return inode;
254
255 if (no_formal_ino) {
256 error = -EIO;
257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
258 goto fail_iput;
259 }
260 return inode;
261
262 fail_iput:
263 iput(inode);
264 return ERR_PTR(error);
265 }
266
267
268 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
269 {
270 struct qstr qstr;
271 struct inode *inode;
272 gfs2_str2qstr(&qstr, name);
273 inode = gfs2_lookupi(dip, &qstr, 1);
274 /* gfs2_lookupi has inconsistent callers: vfs
275 * related routines expect NULL for no entry found,
276 * gfs2_lookup_simple callers expect ENOENT
277 * and do not check for NULL.
278 */
279 if (inode == NULL)
280 return ERR_PTR(-ENOENT);
281 else
282 return inode;
283 }
284
285
286 /**
287 * gfs2_lookupi - Look up a filename in a directory and return its inode
288 * @d_gh: An initialized holder for the directory glock
289 * @name: The name of the inode to look for
290 * @is_root: If 1, ignore the caller's permissions
291 * @i_gh: An uninitialized holder for the new inode glock
292 *
293 * This can be called via the VFS filldir function when NFS is doing
294 * a readdirplus and the inode which its intending to stat isn't
295 * already in cache. In this case we must not take the directory glock
296 * again, since the readdir call will have already taken that lock.
297 *
298 * Returns: errno
299 */
300
301 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
302 int is_root)
303 {
304 struct super_block *sb = dir->i_sb;
305 struct gfs2_inode *dip = GFS2_I(dir);
306 struct gfs2_holder d_gh;
307 int error = 0;
308 struct inode *inode = NULL;
309
310 gfs2_holder_mark_uninitialized(&d_gh);
311 if (!name->len || name->len > GFS2_FNAMESIZE)
312 return ERR_PTR(-ENAMETOOLONG);
313
314 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
315 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
316 dir == d_inode(sb->s_root))) {
317 igrab(dir);
318 return dir;
319 }
320
321 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
322 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
323 if (error)
324 return ERR_PTR(error);
325 }
326
327 if (!is_root) {
328 error = gfs2_permission(dir, MAY_EXEC);
329 if (error)
330 goto out;
331 }
332
333 inode = gfs2_dir_search(dir, name, false);
334 if (IS_ERR(inode))
335 error = PTR_ERR(inode);
336 out:
337 if (gfs2_holder_initialized(&d_gh))
338 gfs2_glock_dq_uninit(&d_gh);
339 if (error == -ENOENT)
340 return NULL;
341 return inode ? inode : ERR_PTR(error);
342 }
343
344 /**
345 * create_ok - OK to create a new on-disk inode here?
346 * @dip: Directory in which dinode is to be created
347 * @name: Name of new dinode
348 * @mode:
349 *
350 * Returns: errno
351 */
352
353 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
354 umode_t mode)
355 {
356 int error;
357
358 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
359 if (error)
360 return error;
361
362 /* Don't create entries in an unlinked directory */
363 if (!dip->i_inode.i_nlink)
364 return -ENOENT;
365
366 if (dip->i_entries == (u32)-1)
367 return -EFBIG;
368 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
369 return -EMLINK;
370
371 return 0;
372 }
373
374 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
375 struct inode *inode)
376 {
377 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
378 (dip->i_inode.i_mode & S_ISUID) &&
379 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
380 if (S_ISDIR(inode->i_mode))
381 inode->i_mode |= S_ISUID;
382 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
383 inode->i_mode &= ~07111;
384 inode->i_uid = dip->i_inode.i_uid;
385 } else
386 inode->i_uid = current_fsuid();
387
388 if (dip->i_inode.i_mode & S_ISGID) {
389 if (S_ISDIR(inode->i_mode))
390 inode->i_mode |= S_ISGID;
391 inode->i_gid = dip->i_inode.i_gid;
392 } else
393 inode->i_gid = current_fsgid();
394 }
395
396 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
397 {
398 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
399 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
400 int error;
401
402 error = gfs2_quota_lock_check(ip, &ap);
403 if (error)
404 goto out;
405
406 error = gfs2_inplace_reserve(ip, &ap);
407 if (error)
408 goto out_quota;
409
410 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
411 if (error)
412 goto out_ipreserv;
413
414 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
415 ip->i_no_formal_ino = ip->i_generation;
416 ip->i_inode.i_ino = ip->i_no_addr;
417 ip->i_goal = ip->i_no_addr;
418
419 gfs2_trans_end(sdp);
420
421 out_ipreserv:
422 gfs2_inplace_release(ip);
423 out_quota:
424 gfs2_quota_unlock(ip);
425 out:
426 return error;
427 }
428
429 static void gfs2_init_dir(struct buffer_head *dibh,
430 const struct gfs2_inode *parent)
431 {
432 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
433 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
434
435 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
436 dent->de_inum = di->di_num; /* already GFS2 endian */
437 dent->de_type = cpu_to_be16(DT_DIR);
438
439 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
440 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
441 gfs2_inum_out(parent, dent);
442 dent->de_type = cpu_to_be16(DT_DIR);
443
444 }
445
446 /**
447 * gfs2_init_xattr - Initialise an xattr block for a new inode
448 * @ip: The inode in question
449 *
450 * This sets up an empty xattr block for a new inode, ready to
451 * take any ACLs, LSM xattrs, etc.
452 */
453
454 static void gfs2_init_xattr(struct gfs2_inode *ip)
455 {
456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
457 struct buffer_head *bh;
458 struct gfs2_ea_header *ea;
459
460 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
461 gfs2_trans_add_meta(ip->i_gl, bh);
462 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
463 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
464
465 ea = GFS2_EA_BH2FIRST(bh);
466 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
467 ea->ea_type = GFS2_EATYPE_UNUSED;
468 ea->ea_flags = GFS2_EAFLAG_LAST;
469
470 brelse(bh);
471 }
472
473 /**
474 * init_dinode - Fill in a new dinode structure
475 * @dip: The directory this inode is being created in
476 * @ip: The inode
477 * @symname: The symlink destination (if a symlink)
478 * @bhp: The buffer head (returned to caller)
479 *
480 */
481
482 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
483 const char *symname)
484 {
485 struct gfs2_dinode *di;
486 struct buffer_head *dibh;
487
488 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
489 gfs2_trans_add_meta(ip->i_gl, dibh);
490 di = (struct gfs2_dinode *)dibh->b_data;
491 gfs2_dinode_out(ip, di);
492
493 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
494 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
495 di->__pad1 = 0;
496 di->__pad2 = 0;
497 di->__pad3 = 0;
498 memset(&di->__pad4, 0, sizeof(di->__pad4));
499 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
500 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
501
502 switch(ip->i_inode.i_mode & S_IFMT) {
503 case S_IFDIR:
504 gfs2_init_dir(dibh, dip);
505 break;
506 case S_IFLNK:
507 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
508 break;
509 }
510
511 set_buffer_uptodate(dibh);
512 brelse(dibh);
513 }
514
515 /**
516 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
517 * @dip: The directory we are linking into
518 * @da: The dir add information
519 * @nr_inodes: The number of inodes involved
520 *
521 * This calculate the number of blocks we need to reserve in a
522 * transaction to link @nr_inodes into a directory. In most cases
523 * @nr_inodes will be 2 (the directory plus the inode being linked in)
524 * but in case of rename, 4 may be required.
525 *
526 * Returns: Number of blocks
527 */
528
529 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
530 const struct gfs2_diradd *da,
531 unsigned nr_inodes)
532 {
533 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
534 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
535 }
536
537 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
538 struct gfs2_inode *ip, struct gfs2_diradd *da)
539 {
540 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
541 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
542 int error;
543
544 if (da->nr_blocks) {
545 error = gfs2_quota_lock_check(dip, &ap);
546 if (error)
547 goto fail_quota_locks;
548
549 error = gfs2_inplace_reserve(dip, &ap);
550 if (error)
551 goto fail_quota_locks;
552
553 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
554 if (error)
555 goto fail_ipreserv;
556 } else {
557 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
558 if (error)
559 goto fail_quota_locks;
560 }
561
562 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
563
564 gfs2_trans_end(sdp);
565 fail_ipreserv:
566 gfs2_inplace_release(dip);
567 fail_quota_locks:
568 gfs2_quota_unlock(dip);
569 return error;
570 }
571
572 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
573 void *fs_info)
574 {
575 const struct xattr *xattr;
576 int err = 0;
577
578 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
579 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
580 xattr->value_len, 0,
581 GFS2_EATYPE_SECURITY);
582 if (err < 0)
583 break;
584 }
585 return err;
586 }
587
588 /**
589 * gfs2_create_inode - Create a new inode
590 * @dir: The parent directory
591 * @dentry: The new dentry
592 * @file: If non-NULL, the file which is being opened
593 * @mode: The permissions on the new inode
594 * @dev: For device nodes, this is the device number
595 * @symname: For symlinks, this is the link destination
596 * @size: The initial size of the inode (ignored for directories)
597 *
598 * Returns: 0 on success, or error code
599 */
600
601 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
602 struct file *file,
603 umode_t mode, dev_t dev, const char *symname,
604 unsigned int size, int excl)
605 {
606 const struct qstr *name = &dentry->d_name;
607 struct posix_acl *default_acl, *acl;
608 struct gfs2_holder ghs[2];
609 struct inode *inode = NULL;
610 struct gfs2_inode *dip = GFS2_I(dir), *ip;
611 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
612 struct gfs2_glock *io_gl;
613 int error, free_vfs_inode = 1;
614 u32 aflags = 0;
615 unsigned blocks = 1;
616 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
617
618 if (!name->len || name->len > GFS2_FNAMESIZE)
619 return -ENAMETOOLONG;
620
621 error = gfs2_qa_get(dip);
622 if (error)
623 return error;
624
625 error = gfs2_rindex_update(sdp);
626 if (error)
627 goto fail;
628
629 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
630 if (error)
631 goto fail;
632 gfs2_holder_mark_uninitialized(ghs + 1);
633
634 error = create_ok(dip, name, mode);
635 if (error)
636 goto fail_gunlock;
637
638 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
639 error = PTR_ERR(inode);
640 if (!IS_ERR(inode)) {
641 if (S_ISDIR(inode->i_mode)) {
642 iput(inode);
643 inode = ERR_PTR(-EISDIR);
644 goto fail_gunlock;
645 }
646 d_instantiate(dentry, inode);
647 error = 0;
648 if (file) {
649 if (S_ISREG(inode->i_mode))
650 error = finish_open(file, dentry, gfs2_open_common);
651 else
652 error = finish_no_open(file, NULL);
653 }
654 gfs2_glock_dq_uninit(ghs);
655 goto fail;
656 } else if (error != -ENOENT) {
657 goto fail_gunlock;
658 }
659
660 error = gfs2_diradd_alloc_required(dir, name, &da);
661 if (error < 0)
662 goto fail_gunlock;
663
664 inode = new_inode(sdp->sd_vfs);
665 error = -ENOMEM;
666 if (!inode)
667 goto fail_gunlock;
668
669 error = posix_acl_create(dir, &mode, &default_acl, &acl);
670 if (error)
671 goto fail_gunlock;
672
673 ip = GFS2_I(inode);
674 error = gfs2_qa_get(ip);
675 if (error)
676 goto fail_free_acls;
677
678 inode->i_mode = mode;
679 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
680 inode->i_rdev = dev;
681 inode->i_size = size;
682 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
683 munge_mode_uid_gid(dip, inode);
684 check_and_update_goal(dip);
685 ip->i_goal = dip->i_goal;
686 ip->i_diskflags = 0;
687 ip->i_eattr = 0;
688 ip->i_height = 0;
689 ip->i_depth = 0;
690 ip->i_entries = 0;
691 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
692
693 switch(mode & S_IFMT) {
694 case S_IFREG:
695 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
696 gfs2_tune_get(sdp, gt_new_files_jdata))
697 ip->i_diskflags |= GFS2_DIF_JDATA;
698 gfs2_set_aops(inode);
699 break;
700 case S_IFDIR:
701 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
702 ip->i_diskflags |= GFS2_DIF_JDATA;
703 ip->i_entries = 2;
704 break;
705 }
706
707 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
708 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
709 ip->i_diskflags |= GFS2_DIF_SYSTEM;
710
711 gfs2_set_inode_flags(inode);
712
713 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
714 (dip->i_diskflags & GFS2_DIF_TOPDIR))
715 aflags |= GFS2_AF_ORLOV;
716
717 if (default_acl || acl)
718 blocks++;
719
720 error = alloc_dinode(ip, aflags, &blocks);
721 if (error)
722 goto fail_free_inode;
723
724 gfs2_set_inode_blocks(inode, blocks);
725
726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
727 if (error)
728 goto fail_free_inode;
729 flush_delayed_work(&ip->i_gl->gl_work);
730 glock_set_object(ip->i_gl, ip);
731
732 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
733 if (error)
734 goto fail_free_inode;
735 gfs2_cancel_delete_work(io_gl);
736 glock_set_object(io_gl, ip);
737
738 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
739 if (error)
740 goto fail_gunlock2;
741
742 error = gfs2_trans_begin(sdp, blocks, 0);
743 if (error)
744 goto fail_gunlock2;
745
746 if (blocks > 1) {
747 ip->i_eattr = ip->i_no_addr + 1;
748 gfs2_init_xattr(ip);
749 }
750 init_dinode(dip, ip, symname);
751 gfs2_trans_end(sdp);
752
753 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
754 if (error)
755 goto fail_gunlock2;
756
757 gfs2_set_iop(inode);
758 insert_inode_hash(inode);
759
760 free_vfs_inode = 0; /* After this point, the inode is no longer
761 considered free. Any failures need to undo
762 the gfs2 structures. */
763 if (default_acl) {
764 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
765 if (error)
766 goto fail_gunlock3;
767 posix_acl_release(default_acl);
768 default_acl = NULL;
769 }
770 if (acl) {
771 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
772 if (error)
773 goto fail_gunlock3;
774 posix_acl_release(acl);
775 acl = NULL;
776 }
777
778 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
779 &gfs2_initxattrs, NULL);
780 if (error)
781 goto fail_gunlock3;
782
783 error = link_dinode(dip, name, ip, &da);
784 if (error)
785 goto fail_gunlock3;
786
787 mark_inode_dirty(inode);
788 d_instantiate(dentry, inode);
789 /* After instantiate, errors should result in evict which will destroy
790 * both inode and iopen glocks properly. */
791 if (file) {
792 file->f_mode |= FMODE_CREATED;
793 error = finish_open(file, dentry, gfs2_open_common);
794 }
795 gfs2_glock_dq_uninit(ghs);
796 gfs2_qa_put(ip);
797 gfs2_glock_dq_uninit(ghs + 1);
798 gfs2_glock_put(io_gl);
799 gfs2_qa_put(dip);
800 return error;
801
802 fail_gunlock3:
803 glock_clear_object(io_gl, ip);
804 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
805 fail_gunlock2:
806 glock_clear_object(io_gl, ip);
807 gfs2_glock_put(io_gl);
808 fail_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_delete(ip, NULL);
815 gfs2_qa_put(ip);
816 fail_free_acls:
817 posix_acl_release(default_acl);
818 posix_acl_release(acl);
819 fail_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);
832 fail:
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
846 static 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
862 static 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
902 static 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
920 static 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
1022 out_brelse:
1023 brelse(dibh);
1024 out_end_trans:
1025 gfs2_trans_end(sdp);
1026 out_ipres:
1027 if (da.nr_blocks)
1028 gfs2_inplace_release(dip);
1029 out_gunlock_q:
1030 if (da.nr_blocks)
1031 gfs2_quota_unlock(dip);
1032 out_gunlock:
1033 gfs2_dir_no_add(&da);
1034 gfs2_glock_dq(ghs + 1);
1035 out_child:
1036 gfs2_glock_dq(ghs);
1037 out_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
1055 static 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
1090 static 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
1125 static 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
1184 out_gunlock:
1185 gfs2_glock_dq(ghs + 2);
1186 out_rgrp:
1187 gfs2_glock_dq(ghs + 1);
1188 out_child:
1189 gfs2_glock_dq(ghs);
1190 out_parent:
1191 gfs2_holder_uninit(ghs + 2);
1192 out_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
1207 static 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
1228 static 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
1243 static 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
1260 static 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
1284 skip_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
1302 static 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
1349 static 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
1371 static 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
1577 out_end_trans:
1578 gfs2_trans_end(sdp);
1579 out_ipreserv:
1580 if (da.nr_blocks)
1581 gfs2_inplace_release(ndip);
1582 out_gunlock_q:
1583 if (da.nr_blocks)
1584 gfs2_quota_unlock(ndip);
1585 out_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 }
1595 out_gunlock_r:
1596 if (gfs2_holder_initialized(&r_gh))
1597 gfs2_glock_dq_uninit(&r_gh);
1598 out:
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
1614 static 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
1735 out_end_trans:
1736 gfs2_trans_end(sdp);
1737 out_gunlock:
1738 while (x--) {
1739 if (gfs2_holder_queued(ghs + x))
1740 gfs2_glock_dq(ghs + x);
1741 gfs2_holder_uninit(ghs + x);
1742 }
1743 out_gunlock_r:
1744 if (gfs2_holder_initialized(&r_gh))
1745 gfs2_glock_dq_uninit(&r_gh);
1746 out:
1747 return error;
1748 }
1749
1750 static 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
1776 static 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);
1816 out:
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
1836 int gfs2_permission(struct inode *inode, int mask)
1837 {
1838 struct gfs2_inode *ip;
1839 struct gfs2_holder i_gh;
1840 int error;
1841
1842 gfs2_holder_mark_uninitialized(&i_gh);
1843 ip = GFS2_I(inode);
1844 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1845 if (mask & MAY_NOT_BLOCK)
1846 return -ECHILD;
1847 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1848 if (error)
1849 return error;
1850 }
1851
1852 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1853 error = -EPERM;
1854 else
1855 error = generic_permission(inode, mask);
1856 if (gfs2_holder_initialized(&i_gh))
1857 gfs2_glock_dq_uninit(&i_gh);
1858
1859 return error;
1860 }
1861
1862 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1863 {
1864 setattr_copy(inode, attr);
1865 mark_inode_dirty(inode);
1866 return 0;
1867 }
1868
1869 /**
1870 * gfs2_setattr_simple -
1871 * @ip:
1872 * @attr:
1873 *
1874 * Returns: errno
1875 */
1876
1877 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1878 {
1879 int error;
1880
1881 if (current->journal_info)
1882 return __gfs2_setattr_simple(inode, attr);
1883
1884 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1885 if (error)
1886 return error;
1887
1888 error = __gfs2_setattr_simple(inode, attr);
1889 gfs2_trans_end(GFS2_SB(inode));
1890 return error;
1891 }
1892
1893 static int setattr_chown(struct inode *inode, struct iattr *attr)
1894 {
1895 struct gfs2_inode *ip = GFS2_I(inode);
1896 struct gfs2_sbd *sdp = GFS2_SB(inode);
1897 kuid_t ouid, nuid;
1898 kgid_t ogid, ngid;
1899 int error;
1900 struct gfs2_alloc_parms ap;
1901
1902 ouid = inode->i_uid;
1903 ogid = inode->i_gid;
1904 nuid = attr->ia_uid;
1905 ngid = attr->ia_gid;
1906
1907 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1908 ouid = nuid = NO_UID_QUOTA_CHANGE;
1909 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1910 ogid = ngid = NO_GID_QUOTA_CHANGE;
1911 error = gfs2_qa_get(ip);
1912 if (error)
1913 return error;
1914
1915 error = gfs2_rindex_update(sdp);
1916 if (error)
1917 goto out;
1918
1919 error = gfs2_quota_lock(ip, nuid, ngid);
1920 if (error)
1921 goto out;
1922
1923 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1924
1925 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1926 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1927 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1928 if (error)
1929 goto out_gunlock_q;
1930 }
1931
1932 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1933 if (error)
1934 goto out_gunlock_q;
1935
1936 error = gfs2_setattr_simple(inode, attr);
1937 if (error)
1938 goto out_end_trans;
1939
1940 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1941 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1942 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1943 gfs2_quota_change(ip, ap.target, nuid, ngid);
1944 }
1945
1946 out_end_trans:
1947 gfs2_trans_end(sdp);
1948 out_gunlock_q:
1949 gfs2_quota_unlock(ip);
1950 out:
1951 gfs2_qa_put(ip);
1952 return error;
1953 }
1954
1955 /**
1956 * gfs2_setattr - Change attributes on an inode
1957 * @dentry: The dentry which is changing
1958 * @attr: The structure describing the change
1959 *
1960 * The VFS layer wants to change one or more of an inodes attributes. Write
1961 * that change out to disk.
1962 *
1963 * Returns: errno
1964 */
1965
1966 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1967 {
1968 struct inode *inode = d_inode(dentry);
1969 struct gfs2_inode *ip = GFS2_I(inode);
1970 struct gfs2_holder i_gh;
1971 int error;
1972
1973 error = gfs2_qa_get(ip);
1974 if (error)
1975 return error;
1976
1977 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1978 if (error)
1979 goto out;
1980
1981 error = -EPERM;
1982 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1983 goto error;
1984
1985 error = setattr_prepare(dentry, attr);
1986 if (error)
1987 goto error;
1988
1989 if (attr->ia_valid & ATTR_SIZE)
1990 error = gfs2_setattr_size(inode, attr->ia_size);
1991 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1992 error = setattr_chown(inode, attr);
1993 else {
1994 error = gfs2_setattr_simple(inode, attr);
1995 if (!error && attr->ia_valid & ATTR_MODE)
1996 error = posix_acl_chmod(inode, inode->i_mode);
1997 }
1998
1999 error:
2000 if (!error)
2001 mark_inode_dirty(inode);
2002 gfs2_glock_dq_uninit(&i_gh);
2003 out:
2004 gfs2_qa_put(ip);
2005 return error;
2006 }
2007
2008 /**
2009 * gfs2_getattr - Read out an inode's attributes
2010 * @path: Object to query
2011 * @stat: The inode's stats
2012 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2013 * @flags: AT_STATX_xxx setting
2014 *
2015 * This may be called from the VFS directly, or from within GFS2 with the
2016 * inode locked, so we look to see if the glock is already locked and only
2017 * lock the glock if its not already been done. Note that its the NFS
2018 * readdirplus operation which causes this to be called (from filldir)
2019 * with the glock already held.
2020 *
2021 * Returns: errno
2022 */
2023
2024 static int gfs2_getattr(const struct path *path, struct kstat *stat,
2025 u32 request_mask, unsigned int flags)
2026 {
2027 struct inode *inode = d_inode(path->dentry);
2028 struct gfs2_inode *ip = GFS2_I(inode);
2029 struct gfs2_holder gh;
2030 u32 gfsflags;
2031 int error;
2032
2033 gfs2_holder_mark_uninitialized(&gh);
2034 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2035 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2036 if (error)
2037 return error;
2038 }
2039
2040 gfsflags = ip->i_diskflags;
2041 if (gfsflags & GFS2_DIF_APPENDONLY)
2042 stat->attributes |= STATX_ATTR_APPEND;
2043 if (gfsflags & GFS2_DIF_IMMUTABLE)
2044 stat->attributes |= STATX_ATTR_IMMUTABLE;
2045
2046 stat->attributes_mask |= (STATX_ATTR_APPEND |
2047 STATX_ATTR_COMPRESSED |
2048 STATX_ATTR_ENCRYPTED |
2049 STATX_ATTR_IMMUTABLE |
2050 STATX_ATTR_NODUMP);
2051
2052 generic_fillattr(inode, stat);
2053
2054 if (gfs2_holder_initialized(&gh))
2055 gfs2_glock_dq_uninit(&gh);
2056
2057 return 0;
2058 }
2059
2060 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2061 u64 start, u64 len)
2062 {
2063 struct gfs2_inode *ip = GFS2_I(inode);
2064 struct gfs2_holder gh;
2065 int ret;
2066
2067 inode_lock_shared(inode);
2068
2069 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2070 if (ret)
2071 goto out;
2072
2073 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2074
2075 gfs2_glock_dq_uninit(&gh);
2076
2077 out:
2078 inode_unlock_shared(inode);
2079 return ret;
2080 }
2081
2082 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2083 {
2084 struct inode *inode = file->f_mapping->host;
2085 struct gfs2_inode *ip = GFS2_I(inode);
2086 struct gfs2_holder gh;
2087 loff_t ret;
2088
2089 inode_lock_shared(inode);
2090 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2091 if (!ret)
2092 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2093 gfs2_glock_dq_uninit(&gh);
2094 inode_unlock_shared(inode);
2095
2096 if (ret < 0)
2097 return ret;
2098 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2099 }
2100
2101 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2102 {
2103 struct inode *inode = file->f_mapping->host;
2104 struct gfs2_inode *ip = GFS2_I(inode);
2105 struct gfs2_holder gh;
2106 loff_t ret;
2107
2108 inode_lock_shared(inode);
2109 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2110 if (!ret)
2111 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2112 gfs2_glock_dq_uninit(&gh);
2113 inode_unlock_shared(inode);
2114
2115 if (ret < 0)
2116 return ret;
2117 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2118 }
2119
2120 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2121 int flags)
2122 {
2123 struct gfs2_inode *ip = GFS2_I(inode);
2124 struct gfs2_glock *gl = ip->i_gl;
2125 struct gfs2_holder *gh;
2126 int error;
2127
2128 gh = gfs2_glock_is_locked_by_me(gl);
2129 if (gh && !gfs2_glock_is_held_excl(gl)) {
2130 gfs2_glock_dq(gh);
2131 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2132 error = gfs2_glock_nq(gh);
2133 if (error)
2134 return error;
2135 }
2136 return generic_update_time(inode, time, flags);
2137 }
2138
2139 static const struct inode_operations gfs2_file_iops = {
2140 .permission = gfs2_permission,
2141 .setattr = gfs2_setattr,
2142 .getattr = gfs2_getattr,
2143 .listxattr = gfs2_listxattr,
2144 .fiemap = gfs2_fiemap,
2145 .get_acl = gfs2_get_acl,
2146 .set_acl = gfs2_set_acl,
2147 .update_time = gfs2_update_time,
2148 };
2149
2150 static const struct inode_operations gfs2_dir_iops = {
2151 .create = gfs2_create,
2152 .lookup = gfs2_lookup,
2153 .link = gfs2_link,
2154 .unlink = gfs2_unlink,
2155 .symlink = gfs2_symlink,
2156 .mkdir = gfs2_mkdir,
2157 .rmdir = gfs2_unlink,
2158 .mknod = gfs2_mknod,
2159 .rename = gfs2_rename2,
2160 .permission = gfs2_permission,
2161 .setattr = gfs2_setattr,
2162 .getattr = gfs2_getattr,
2163 .listxattr = gfs2_listxattr,
2164 .fiemap = gfs2_fiemap,
2165 .get_acl = gfs2_get_acl,
2166 .set_acl = gfs2_set_acl,
2167 .update_time = gfs2_update_time,
2168 .atomic_open = gfs2_atomic_open,
2169 };
2170
2171 static const struct inode_operations gfs2_symlink_iops = {
2172 .get_link = gfs2_get_link,
2173 .permission = gfs2_permission,
2174 .setattr = gfs2_setattr,
2175 .getattr = gfs2_getattr,
2176 .listxattr = gfs2_listxattr,
2177 .fiemap = gfs2_fiemap,
2178 };
2179
Linux with added FPC-III support