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Merge tag 'char-misc-5.15-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-jammy-kernel.git] / fs / gfs2 / inode.c
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 * @dir: The inode of the directory containing the inode to look-up
289 * @name: The name of the inode to look for
290 * @is_root: If 1, ignore the caller's permissions
291 *
292 * This can be called via the VFS filldir function when NFS is doing
293 * a readdirplus and the inode which its intending to stat isn't
294 * already in cache. In this case we must not take the directory glock
295 * again, since the readdir call will have already taken that lock.
296 *
297 * Returns: errno
298 */
299
300 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
301 int is_root)
302 {
303 struct super_block *sb = dir->i_sb;
304 struct gfs2_inode *dip = GFS2_I(dir);
305 struct gfs2_holder d_gh;
306 int error = 0;
307 struct inode *inode = NULL;
308
309 gfs2_holder_mark_uninitialized(&d_gh);
310 if (!name->len || name->len > GFS2_FNAMESIZE)
311 return ERR_PTR(-ENAMETOOLONG);
312
313 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
314 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
315 dir == d_inode(sb->s_root))) {
316 igrab(dir);
317 return dir;
318 }
319
320 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
321 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
322 if (error)
323 return ERR_PTR(error);
324 }
325
326 if (!is_root) {
327 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
328 if (error)
329 goto out;
330 }
331
332 inode = gfs2_dir_search(dir, name, false);
333 if (IS_ERR(inode))
334 error = PTR_ERR(inode);
335 out:
336 if (gfs2_holder_initialized(&d_gh))
337 gfs2_glock_dq_uninit(&d_gh);
338 if (error == -ENOENT)
339 return NULL;
340 return inode ? inode : ERR_PTR(error);
341 }
342
343 /**
344 * create_ok - OK to create a new on-disk inode here?
345 * @dip: Directory in which dinode is to be created
346 * @name: Name of new dinode
347 * @mode:
348 *
349 * Returns: errno
350 */
351
352 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
353 umode_t mode)
354 {
355 int error;
356
357 error = gfs2_permission(&init_user_ns, &dip->i_inode,
358 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 *
479 */
480
481 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
482 const char *symname)
483 {
484 struct gfs2_dinode *di;
485 struct buffer_head *dibh;
486
487 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
488 gfs2_trans_add_meta(ip->i_gl, dibh);
489 di = (struct gfs2_dinode *)dibh->b_data;
490 gfs2_dinode_out(ip, di);
491
492 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
493 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
494 di->__pad1 = 0;
495 di->__pad2 = 0;
496 di->__pad3 = 0;
497 memset(&di->__pad4, 0, sizeof(di->__pad4));
498 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
499 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
500
501 switch(ip->i_inode.i_mode & S_IFMT) {
502 case S_IFDIR:
503 gfs2_init_dir(dibh, dip);
504 break;
505 case S_IFLNK:
506 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
507 break;
508 }
509
510 set_buffer_uptodate(dibh);
511 brelse(dibh);
512 }
513
514 /**
515 * gfs2_trans_da_blks - Calculate number of blocks to link inode
516 * @dip: The directory we are linking into
517 * @da: The dir add information
518 * @nr_inodes: The number of inodes involved
519 *
520 * This calculate the number of blocks we need to reserve in a
521 * transaction to link @nr_inodes into a directory. In most cases
522 * @nr_inodes will be 2 (the directory plus the inode being linked in)
523 * but in case of rename, 4 may be required.
524 *
525 * Returns: Number of blocks
526 */
527
528 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
529 const struct gfs2_diradd *da,
530 unsigned nr_inodes)
531 {
532 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
533 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
534 }
535
536 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
537 struct gfs2_inode *ip, struct gfs2_diradd *da)
538 {
539 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
540 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
541 int error;
542
543 if (da->nr_blocks) {
544 error = gfs2_quota_lock_check(dip, &ap);
545 if (error)
546 goto fail_quota_locks;
547
548 error = gfs2_inplace_reserve(dip, &ap);
549 if (error)
550 goto fail_quota_locks;
551
552 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
553 if (error)
554 goto fail_ipreserv;
555 } else {
556 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
557 if (error)
558 goto fail_quota_locks;
559 }
560
561 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
562
563 gfs2_trans_end(sdp);
564 fail_ipreserv:
565 gfs2_inplace_release(dip);
566 fail_quota_locks:
567 gfs2_quota_unlock(dip);
568 return error;
569 }
570
571 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
572 void *fs_info)
573 {
574 const struct xattr *xattr;
575 int err = 0;
576
577 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
578 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
579 xattr->value_len, 0,
580 GFS2_EATYPE_SECURITY);
581 if (err < 0)
582 break;
583 }
584 return err;
585 }
586
587 /**
588 * gfs2_create_inode - Create a new inode
589 * @dir: The parent directory
590 * @dentry: The new dentry
591 * @file: If non-NULL, the file which is being opened
592 * @mode: The permissions on the new inode
593 * @dev: For device nodes, this is the device number
594 * @symname: For symlinks, this is the link destination
595 * @size: The initial size of the inode (ignored for directories)
596 * @excl: Force fail if inode exists
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 * @mnt_userns: User namespace of the mount the inode was found from
840 * @dir: The directory in which to create the file
841 * @dentry: The dentry of the new file
842 * @mode: The mode of the new file
843 * @excl: Force fail if inode exists
844 *
845 * Returns: errno
846 */
847
848 static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
849 struct dentry *dentry, umode_t mode, bool excl)
850 {
851 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
852 }
853
854 /**
855 * __gfs2_lookup - Look up a filename in a directory and return its inode
856 * @dir: The directory inode
857 * @dentry: The dentry of the new inode
858 * @file: File to be opened
859 *
860 *
861 * Returns: errno
862 */
863
864 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
865 struct file *file)
866 {
867 struct inode *inode;
868 struct dentry *d;
869 struct gfs2_holder gh;
870 struct gfs2_glock *gl;
871 int error;
872
873 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
874 if (inode == NULL) {
875 d_add(dentry, NULL);
876 return NULL;
877 }
878 if (IS_ERR(inode))
879 return ERR_CAST(inode);
880
881 gl = GFS2_I(inode)->i_gl;
882 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
883 if (error) {
884 iput(inode);
885 return ERR_PTR(error);
886 }
887
888 d = d_splice_alias(inode, dentry);
889 if (IS_ERR(d)) {
890 gfs2_glock_dq_uninit(&gh);
891 return d;
892 }
893 if (file && S_ISREG(inode->i_mode))
894 error = finish_open(file, dentry, gfs2_open_common);
895
896 gfs2_glock_dq_uninit(&gh);
897 if (error) {
898 dput(d);
899 return ERR_PTR(error);
900 }
901 return d;
902 }
903
904 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
905 unsigned flags)
906 {
907 return __gfs2_lookup(dir, dentry, NULL);
908 }
909
910 /**
911 * gfs2_link - Link to a file
912 * @old_dentry: The inode to link
913 * @dir: Add link to this directory
914 * @dentry: The name of the link
915 *
916 * Link the inode in "old_dentry" into the directory "dir" with the
917 * name in "dentry".
918 *
919 * Returns: errno
920 */
921
922 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
923 struct dentry *dentry)
924 {
925 struct gfs2_inode *dip = GFS2_I(dir);
926 struct gfs2_sbd *sdp = GFS2_SB(dir);
927 struct inode *inode = d_inode(old_dentry);
928 struct gfs2_inode *ip = GFS2_I(inode);
929 struct gfs2_holder ghs[2];
930 struct buffer_head *dibh;
931 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
932 int error;
933
934 if (S_ISDIR(inode->i_mode))
935 return -EPERM;
936
937 error = gfs2_qa_get(dip);
938 if (error)
939 return error;
940
941 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
942 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
943
944 error = gfs2_glock_nq(ghs); /* parent */
945 if (error)
946 goto out_parent;
947
948 error = gfs2_glock_nq(ghs + 1); /* child */
949 if (error)
950 goto out_child;
951
952 error = -ENOENT;
953 if (inode->i_nlink == 0)
954 goto out_gunlock;
955
956 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
957 if (error)
958 goto out_gunlock;
959
960 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
961 switch (error) {
962 case -ENOENT:
963 break;
964 case 0:
965 error = -EEXIST;
966 goto out_gunlock;
967 default:
968 goto out_gunlock;
969 }
970
971 error = -EINVAL;
972 if (!dip->i_inode.i_nlink)
973 goto out_gunlock;
974 error = -EFBIG;
975 if (dip->i_entries == (u32)-1)
976 goto out_gunlock;
977 error = -EPERM;
978 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
979 goto out_gunlock;
980 error = -EINVAL;
981 if (!ip->i_inode.i_nlink)
982 goto out_gunlock;
983 error = -EMLINK;
984 if (ip->i_inode.i_nlink == (u32)-1)
985 goto out_gunlock;
986
987 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
988 if (error < 0)
989 goto out_gunlock;
990
991 if (da.nr_blocks) {
992 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
993 error = gfs2_quota_lock_check(dip, &ap);
994 if (error)
995 goto out_gunlock;
996
997 error = gfs2_inplace_reserve(dip, &ap);
998 if (error)
999 goto out_gunlock_q;
1000
1001 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1002 if (error)
1003 goto out_ipres;
1004 } else {
1005 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1006 if (error)
1007 goto out_ipres;
1008 }
1009
1010 error = gfs2_meta_inode_buffer(ip, &dibh);
1011 if (error)
1012 goto out_end_trans;
1013
1014 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1015 if (error)
1016 goto out_brelse;
1017
1018 gfs2_trans_add_meta(ip->i_gl, dibh);
1019 inc_nlink(&ip->i_inode);
1020 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1021 ihold(inode);
1022 d_instantiate(dentry, inode);
1023 mark_inode_dirty(inode);
1024
1025 out_brelse:
1026 brelse(dibh);
1027 out_end_trans:
1028 gfs2_trans_end(sdp);
1029 out_ipres:
1030 if (da.nr_blocks)
1031 gfs2_inplace_release(dip);
1032 out_gunlock_q:
1033 if (da.nr_blocks)
1034 gfs2_quota_unlock(dip);
1035 out_gunlock:
1036 gfs2_dir_no_add(&da);
1037 gfs2_glock_dq(ghs + 1);
1038 out_child:
1039 gfs2_glock_dq(ghs);
1040 out_parent:
1041 gfs2_qa_put(dip);
1042 gfs2_holder_uninit(ghs);
1043 gfs2_holder_uninit(ghs + 1);
1044 return error;
1045 }
1046
1047 /*
1048 * gfs2_unlink_ok - check to see that a inode is still in a directory
1049 * @dip: the directory
1050 * @name: the name of the file
1051 * @ip: the inode
1052 *
1053 * Assumes that the lock on (at least) @dip is held.
1054 *
1055 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1056 */
1057
1058 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1059 const struct gfs2_inode *ip)
1060 {
1061 int error;
1062
1063 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1064 return -EPERM;
1065
1066 if ((dip->i_inode.i_mode & S_ISVTX) &&
1067 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1068 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1069 return -EPERM;
1070
1071 if (IS_APPEND(&dip->i_inode))
1072 return -EPERM;
1073
1074 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1075 MAY_WRITE | MAY_EXEC);
1076 if (error)
1077 return error;
1078
1079 return gfs2_dir_check(&dip->i_inode, name, ip);
1080 }
1081
1082 /**
1083 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1084 * @dip: The parent directory
1085 * @dentry: The dentry to unlink
1086 *
1087 * Called with all the locks and in a transaction. This will only be
1088 * called for a directory after it has been checked to ensure it is empty.
1089 *
1090 * Returns: 0 on success, or an error
1091 */
1092
1093 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1094 const struct dentry *dentry)
1095 {
1096 struct inode *inode = d_inode(dentry);
1097 struct gfs2_inode *ip = GFS2_I(inode);
1098 int error;
1099
1100 error = gfs2_dir_del(dip, dentry);
1101 if (error)
1102 return error;
1103
1104 ip->i_entries = 0;
1105 inode->i_ctime = current_time(inode);
1106 if (S_ISDIR(inode->i_mode))
1107 clear_nlink(inode);
1108 else
1109 drop_nlink(inode);
1110 mark_inode_dirty(inode);
1111 if (inode->i_nlink == 0)
1112 gfs2_unlink_di(inode);
1113 return 0;
1114 }
1115
1116
1117 /**
1118 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1119 * @dir: The inode of the directory containing the inode to unlink
1120 * @dentry: The file itself
1121 *
1122 * This routine uses the type of the inode as a flag to figure out
1123 * whether this is an unlink or an rmdir.
1124 *
1125 * Returns: errno
1126 */
1127
1128 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1129 {
1130 struct gfs2_inode *dip = GFS2_I(dir);
1131 struct gfs2_sbd *sdp = GFS2_SB(dir);
1132 struct inode *inode = d_inode(dentry);
1133 struct gfs2_inode *ip = GFS2_I(inode);
1134 struct gfs2_holder ghs[3];
1135 struct gfs2_rgrpd *rgd;
1136 int error;
1137
1138 error = gfs2_rindex_update(sdp);
1139 if (error)
1140 return error;
1141
1142 error = -EROFS;
1143
1144 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1145 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1146
1147 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1148 if (!rgd)
1149 goto out_inodes;
1150
1151 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1152
1153
1154 error = gfs2_glock_nq(ghs); /* parent */
1155 if (error)
1156 goto out_parent;
1157
1158 error = gfs2_glock_nq(ghs + 1); /* child */
1159 if (error)
1160 goto out_child;
1161
1162 error = -ENOENT;
1163 if (inode->i_nlink == 0)
1164 goto out_rgrp;
1165
1166 if (S_ISDIR(inode->i_mode)) {
1167 error = -ENOTEMPTY;
1168 if (ip->i_entries > 2 || inode->i_nlink > 2)
1169 goto out_rgrp;
1170 }
1171
1172 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1173 if (error)
1174 goto out_rgrp;
1175
1176 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1177 if (error)
1178 goto out_gunlock;
1179
1180 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1181 if (error)
1182 goto out_gunlock;
1183
1184 error = gfs2_unlink_inode(dip, dentry);
1185 gfs2_trans_end(sdp);
1186
1187 out_gunlock:
1188 gfs2_glock_dq(ghs + 2);
1189 out_rgrp:
1190 gfs2_glock_dq(ghs + 1);
1191 out_child:
1192 gfs2_glock_dq(ghs);
1193 out_parent:
1194 gfs2_holder_uninit(ghs + 2);
1195 out_inodes:
1196 gfs2_holder_uninit(ghs + 1);
1197 gfs2_holder_uninit(ghs);
1198 return error;
1199 }
1200
1201 /**
1202 * gfs2_symlink - Create a symlink
1203 * @mnt_userns: User namespace of the mount the inode was found from
1204 * @dir: The directory to create the symlink in
1205 * @dentry: The dentry to put the symlink in
1206 * @symname: The thing which the link points to
1207 *
1208 * Returns: errno
1209 */
1210
1211 static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1212 struct dentry *dentry, const char *symname)
1213 {
1214 unsigned int size;
1215
1216 size = strlen(symname);
1217 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1218 return -ENAMETOOLONG;
1219
1220 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1221 }
1222
1223 /**
1224 * gfs2_mkdir - Make a directory
1225 * @mnt_userns: User namespace of the mount the inode was found from
1226 * @dir: The parent directory of the new one
1227 * @dentry: The dentry of the new directory
1228 * @mode: The mode of the new directory
1229 *
1230 * Returns: errno
1231 */
1232
1233 static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1234 struct dentry *dentry, umode_t mode)
1235 {
1236 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1237 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1238 }
1239
1240 /**
1241 * gfs2_mknod - Make a special file
1242 * @mnt_userns: User namespace of the mount the inode was found from
1243 * @dir: The directory in which the special file will reside
1244 * @dentry: The dentry of the special file
1245 * @mode: The mode of the special file
1246 * @dev: The device specification of the special file
1247 *
1248 */
1249
1250 static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1251 struct dentry *dentry, umode_t mode, dev_t dev)
1252 {
1253 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1254 }
1255
1256 /**
1257 * gfs2_atomic_open - Atomically open a file
1258 * @dir: The directory
1259 * @dentry: The proposed new entry
1260 * @file: The proposed new struct file
1261 * @flags: open flags
1262 * @mode: File mode
1263 *
1264 * Returns: error code or 0 for success
1265 */
1266
1267 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1268 struct file *file, unsigned flags,
1269 umode_t mode)
1270 {
1271 struct dentry *d;
1272 bool excl = !!(flags & O_EXCL);
1273
1274 if (!d_in_lookup(dentry))
1275 goto skip_lookup;
1276
1277 d = __gfs2_lookup(dir, dentry, file);
1278 if (IS_ERR(d))
1279 return PTR_ERR(d);
1280 if (d != NULL)
1281 dentry = d;
1282 if (d_really_is_positive(dentry)) {
1283 if (!(file->f_mode & FMODE_OPENED))
1284 return finish_no_open(file, d);
1285 dput(d);
1286 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1287 }
1288
1289 BUG_ON(d != NULL);
1290
1291 skip_lookup:
1292 if (!(flags & O_CREAT))
1293 return -ENOENT;
1294
1295 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1296 }
1297
1298 /*
1299 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1300 * @this: move this
1301 * @to: to here
1302 *
1303 * Follow @to back to the root and make sure we don't encounter @this
1304 * Assumes we already hold the rename lock.
1305 *
1306 * Returns: errno
1307 */
1308
1309 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1310 {
1311 struct inode *dir = &to->i_inode;
1312 struct super_block *sb = dir->i_sb;
1313 struct inode *tmp;
1314 int error = 0;
1315
1316 igrab(dir);
1317
1318 for (;;) {
1319 if (dir == &this->i_inode) {
1320 error = -EINVAL;
1321 break;
1322 }
1323 if (dir == d_inode(sb->s_root)) {
1324 error = 0;
1325 break;
1326 }
1327
1328 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1329 if (!tmp) {
1330 error = -ENOENT;
1331 break;
1332 }
1333 if (IS_ERR(tmp)) {
1334 error = PTR_ERR(tmp);
1335 break;
1336 }
1337
1338 iput(dir);
1339 dir = tmp;
1340 }
1341
1342 iput(dir);
1343
1344 return error;
1345 }
1346
1347 /**
1348 * update_moved_ino - Update an inode that's being moved
1349 * @ip: The inode being moved
1350 * @ndip: The parent directory of the new filename
1351 * @dir_rename: True of ip is a directory
1352 *
1353 * Returns: errno
1354 */
1355
1356 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1357 int dir_rename)
1358 {
1359 if (dir_rename)
1360 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1361
1362 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1363 mark_inode_dirty_sync(&ip->i_inode);
1364 return 0;
1365 }
1366
1367
1368 /**
1369 * gfs2_rename - Rename a file
1370 * @odir: Parent directory of old file name
1371 * @odentry: The old dentry of the file
1372 * @ndir: Parent directory of new file name
1373 * @ndentry: The new dentry of the file
1374 *
1375 * Returns: errno
1376 */
1377
1378 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1379 struct inode *ndir, struct dentry *ndentry)
1380 {
1381 struct gfs2_inode *odip = GFS2_I(odir);
1382 struct gfs2_inode *ndip = GFS2_I(ndir);
1383 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1384 struct gfs2_inode *nip = NULL;
1385 struct gfs2_sbd *sdp = GFS2_SB(odir);
1386 struct gfs2_holder ghs[4], r_gh, rd_gh;
1387 struct gfs2_rgrpd *nrgd;
1388 unsigned int num_gh;
1389 int dir_rename = 0;
1390 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1391 unsigned int x;
1392 int error;
1393
1394 gfs2_holder_mark_uninitialized(&r_gh);
1395 gfs2_holder_mark_uninitialized(&rd_gh);
1396 if (d_really_is_positive(ndentry)) {
1397 nip = GFS2_I(d_inode(ndentry));
1398 if (ip == nip)
1399 return 0;
1400 }
1401
1402 error = gfs2_rindex_update(sdp);
1403 if (error)
1404 return error;
1405
1406 error = gfs2_qa_get(ndip);
1407 if (error)
1408 return error;
1409
1410 if (odip != ndip) {
1411 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1412 0, &r_gh);
1413 if (error)
1414 goto out;
1415
1416 if (S_ISDIR(ip->i_inode.i_mode)) {
1417 dir_rename = 1;
1418 /* don't move a directory into its subdir */
1419 error = gfs2_ok_to_move(ip, ndip);
1420 if (error)
1421 goto out_gunlock_r;
1422 }
1423 }
1424
1425 num_gh = 1;
1426 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1427 if (odip != ndip) {
1428 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1429 ghs + num_gh);
1430 num_gh++;
1431 }
1432 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1433 num_gh++;
1434
1435 if (nip) {
1436 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1437 ghs + num_gh);
1438 num_gh++;
1439 }
1440
1441 for (x = 0; x < num_gh; x++) {
1442 error = gfs2_glock_nq(ghs + x);
1443 if (error)
1444 goto out_gunlock;
1445 }
1446 error = gfs2_glock_async_wait(num_gh, ghs);
1447 if (error)
1448 goto out_gunlock;
1449
1450 if (nip) {
1451 /* Grab the resource group glock for unlink flag twiddling.
1452 * This is the case where the target dinode already exists
1453 * so we unlink before doing the rename.
1454 */
1455 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1456 if (!nrgd) {
1457 error = -ENOENT;
1458 goto out_gunlock;
1459 }
1460 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1461 LM_FLAG_NODE_SCOPE, &rd_gh);
1462 if (error)
1463 goto out_gunlock;
1464 }
1465
1466 error = -ENOENT;
1467 if (ip->i_inode.i_nlink == 0)
1468 goto out_gunlock;
1469
1470 /* Check out the old directory */
1471
1472 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1473 if (error)
1474 goto out_gunlock;
1475
1476 /* Check out the new directory */
1477
1478 if (nip) {
1479 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1480 if (error)
1481 goto out_gunlock;
1482
1483 if (nip->i_inode.i_nlink == 0) {
1484 error = -EAGAIN;
1485 goto out_gunlock;
1486 }
1487
1488 if (S_ISDIR(nip->i_inode.i_mode)) {
1489 if (nip->i_entries < 2) {
1490 gfs2_consist_inode(nip);
1491 error = -EIO;
1492 goto out_gunlock;
1493 }
1494 if (nip->i_entries > 2) {
1495 error = -ENOTEMPTY;
1496 goto out_gunlock;
1497 }
1498 }
1499 } else {
1500 error = gfs2_permission(&init_user_ns, ndir,
1501 MAY_WRITE | MAY_EXEC);
1502 if (error)
1503 goto out_gunlock;
1504
1505 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1506 switch (error) {
1507 case -ENOENT:
1508 error = 0;
1509 break;
1510 case 0:
1511 error = -EEXIST;
1512 goto out_gunlock;
1513 default:
1514 goto out_gunlock;
1515 }
1516
1517 if (odip != ndip) {
1518 if (!ndip->i_inode.i_nlink) {
1519 error = -ENOENT;
1520 goto out_gunlock;
1521 }
1522 if (ndip->i_entries == (u32)-1) {
1523 error = -EFBIG;
1524 goto out_gunlock;
1525 }
1526 if (S_ISDIR(ip->i_inode.i_mode) &&
1527 ndip->i_inode.i_nlink == (u32)-1) {
1528 error = -EMLINK;
1529 goto out_gunlock;
1530 }
1531 }
1532 }
1533
1534 /* Check out the dir to be renamed */
1535
1536 if (dir_rename) {
1537 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1538 MAY_WRITE);
1539 if (error)
1540 goto out_gunlock;
1541 }
1542
1543 if (nip == NULL) {
1544 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1545 if (error)
1546 goto out_gunlock;
1547 }
1548
1549 if (da.nr_blocks) {
1550 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1551 error = gfs2_quota_lock_check(ndip, &ap);
1552 if (error)
1553 goto out_gunlock;
1554
1555 error = gfs2_inplace_reserve(ndip, &ap);
1556 if (error)
1557 goto out_gunlock_q;
1558
1559 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1560 4 * RES_LEAF + 4, 0);
1561 if (error)
1562 goto out_ipreserv;
1563 } else {
1564 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1565 5 * RES_LEAF + 4, 0);
1566 if (error)
1567 goto out_gunlock;
1568 }
1569
1570 /* Remove the target file, if it exists */
1571
1572 if (nip)
1573 error = gfs2_unlink_inode(ndip, ndentry);
1574
1575 error = update_moved_ino(ip, ndip, dir_rename);
1576 if (error)
1577 goto out_end_trans;
1578
1579 error = gfs2_dir_del(odip, odentry);
1580 if (error)
1581 goto out_end_trans;
1582
1583 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1584 if (error)
1585 goto out_end_trans;
1586
1587 out_end_trans:
1588 gfs2_trans_end(sdp);
1589 out_ipreserv:
1590 if (da.nr_blocks)
1591 gfs2_inplace_release(ndip);
1592 out_gunlock_q:
1593 if (da.nr_blocks)
1594 gfs2_quota_unlock(ndip);
1595 out_gunlock:
1596 gfs2_dir_no_add(&da);
1597 if (gfs2_holder_initialized(&rd_gh))
1598 gfs2_glock_dq_uninit(&rd_gh);
1599
1600 while (x--) {
1601 if (gfs2_holder_queued(ghs + x))
1602 gfs2_glock_dq(ghs + x);
1603 gfs2_holder_uninit(ghs + x);
1604 }
1605 out_gunlock_r:
1606 if (gfs2_holder_initialized(&r_gh))
1607 gfs2_glock_dq_uninit(&r_gh);
1608 out:
1609 gfs2_qa_put(ndip);
1610 return error;
1611 }
1612
1613 /**
1614 * gfs2_exchange - exchange two files
1615 * @odir: Parent directory of old file name
1616 * @odentry: The old dentry of the file
1617 * @ndir: Parent directory of new file name
1618 * @ndentry: The new dentry of the file
1619 * @flags: The rename flags
1620 *
1621 * Returns: errno
1622 */
1623
1624 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1625 struct inode *ndir, struct dentry *ndentry,
1626 unsigned int flags)
1627 {
1628 struct gfs2_inode *odip = GFS2_I(odir);
1629 struct gfs2_inode *ndip = GFS2_I(ndir);
1630 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1631 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1632 struct gfs2_sbd *sdp = GFS2_SB(odir);
1633 struct gfs2_holder ghs[4], r_gh;
1634 unsigned int num_gh;
1635 unsigned int x;
1636 umode_t old_mode = oip->i_inode.i_mode;
1637 umode_t new_mode = nip->i_inode.i_mode;
1638 int error;
1639
1640 gfs2_holder_mark_uninitialized(&r_gh);
1641 error = gfs2_rindex_update(sdp);
1642 if (error)
1643 return error;
1644
1645 if (odip != ndip) {
1646 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1647 0, &r_gh);
1648 if (error)
1649 goto out;
1650
1651 if (S_ISDIR(old_mode)) {
1652 /* don't move a directory into its subdir */
1653 error = gfs2_ok_to_move(oip, ndip);
1654 if (error)
1655 goto out_gunlock_r;
1656 }
1657
1658 if (S_ISDIR(new_mode)) {
1659 /* don't move a directory into its subdir */
1660 error = gfs2_ok_to_move(nip, odip);
1661 if (error)
1662 goto out_gunlock_r;
1663 }
1664 }
1665
1666 num_gh = 1;
1667 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1668 if (odip != ndip) {
1669 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1670 ghs + num_gh);
1671 num_gh++;
1672 }
1673 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1674 num_gh++;
1675
1676 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1677 num_gh++;
1678
1679 for (x = 0; x < num_gh; x++) {
1680 error = gfs2_glock_nq(ghs + x);
1681 if (error)
1682 goto out_gunlock;
1683 }
1684
1685 error = gfs2_glock_async_wait(num_gh, ghs);
1686 if (error)
1687 goto out_gunlock;
1688
1689 error = -ENOENT;
1690 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1691 goto out_gunlock;
1692
1693 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1694 if (error)
1695 goto out_gunlock;
1696 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1697 if (error)
1698 goto out_gunlock;
1699
1700 if (S_ISDIR(old_mode)) {
1701 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1702 MAY_WRITE);
1703 if (error)
1704 goto out_gunlock;
1705 }
1706 if (S_ISDIR(new_mode)) {
1707 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1708 MAY_WRITE);
1709 if (error)
1710 goto out_gunlock;
1711 }
1712 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1713 if (error)
1714 goto out_gunlock;
1715
1716 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1717 if (error)
1718 goto out_end_trans;
1719
1720 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1721 if (error)
1722 goto out_end_trans;
1723
1724 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1725 IF2DT(old_mode));
1726 if (error)
1727 goto out_end_trans;
1728
1729 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1730 IF2DT(new_mode));
1731 if (error)
1732 goto out_end_trans;
1733
1734 if (odip != ndip) {
1735 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1736 inc_nlink(&odip->i_inode);
1737 drop_nlink(&ndip->i_inode);
1738 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1739 inc_nlink(&ndip->i_inode);
1740 drop_nlink(&odip->i_inode);
1741 }
1742 }
1743 mark_inode_dirty(&ndip->i_inode);
1744 if (odip != ndip)
1745 mark_inode_dirty(&odip->i_inode);
1746
1747 out_end_trans:
1748 gfs2_trans_end(sdp);
1749 out_gunlock:
1750 while (x--) {
1751 if (gfs2_holder_queued(ghs + x))
1752 gfs2_glock_dq(ghs + x);
1753 gfs2_holder_uninit(ghs + x);
1754 }
1755 out_gunlock_r:
1756 if (gfs2_holder_initialized(&r_gh))
1757 gfs2_glock_dq_uninit(&r_gh);
1758 out:
1759 return error;
1760 }
1761
1762 static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1763 struct dentry *odentry, struct inode *ndir,
1764 struct dentry *ndentry, unsigned int flags)
1765 {
1766 flags &= ~RENAME_NOREPLACE;
1767
1768 if (flags & ~RENAME_EXCHANGE)
1769 return -EINVAL;
1770
1771 if (flags & RENAME_EXCHANGE)
1772 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1773
1774 return gfs2_rename(odir, odentry, ndir, ndentry);
1775 }
1776
1777 /**
1778 * gfs2_get_link - Follow a symbolic link
1779 * @dentry: The dentry of the link
1780 * @inode: The inode of the link
1781 * @done: destructor for return value
1782 *
1783 * This can handle symlinks of any size.
1784 *
1785 * Returns: 0 on success or error code
1786 */
1787
1788 static const char *gfs2_get_link(struct dentry *dentry,
1789 struct inode *inode,
1790 struct delayed_call *done)
1791 {
1792 struct gfs2_inode *ip = GFS2_I(inode);
1793 struct gfs2_holder i_gh;
1794 struct buffer_head *dibh;
1795 unsigned int size;
1796 char *buf;
1797 int error;
1798
1799 if (!dentry)
1800 return ERR_PTR(-ECHILD);
1801
1802 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1803 error = gfs2_glock_nq(&i_gh);
1804 if (error) {
1805 gfs2_holder_uninit(&i_gh);
1806 return ERR_PTR(error);
1807 }
1808
1809 size = (unsigned int)i_size_read(&ip->i_inode);
1810 if (size == 0) {
1811 gfs2_consist_inode(ip);
1812 buf = ERR_PTR(-EIO);
1813 goto out;
1814 }
1815
1816 error = gfs2_meta_inode_buffer(ip, &dibh);
1817 if (error) {
1818 buf = ERR_PTR(error);
1819 goto out;
1820 }
1821
1822 buf = kzalloc(size + 1, GFP_NOFS);
1823 if (!buf)
1824 buf = ERR_PTR(-ENOMEM);
1825 else
1826 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1827 brelse(dibh);
1828 out:
1829 gfs2_glock_dq_uninit(&i_gh);
1830 if (!IS_ERR(buf))
1831 set_delayed_call(done, kfree_link, buf);
1832 return buf;
1833 }
1834
1835 /**
1836 * gfs2_permission
1837 * @mnt_userns: User namespace of the mount the inode was found from
1838 * @inode: The inode
1839 * @mask: The mask to be tested
1840 *
1841 * This may be called from the VFS directly, or from within GFS2 with the
1842 * inode locked, so we look to see if the glock is already locked and only
1843 * lock the glock if its not already been done.
1844 *
1845 * Returns: errno
1846 */
1847
1848 int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1849 int mask)
1850 {
1851 struct gfs2_inode *ip;
1852 struct gfs2_holder i_gh;
1853 int error;
1854
1855 gfs2_holder_mark_uninitialized(&i_gh);
1856 ip = GFS2_I(inode);
1857 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1858 if (mask & MAY_NOT_BLOCK)
1859 return -ECHILD;
1860 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1861 if (error)
1862 return error;
1863 }
1864
1865 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1866 error = -EPERM;
1867 else
1868 error = generic_permission(&init_user_ns, inode, mask);
1869 if (gfs2_holder_initialized(&i_gh))
1870 gfs2_glock_dq_uninit(&i_gh);
1871
1872 return error;
1873 }
1874
1875 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1876 {
1877 setattr_copy(&init_user_ns, inode, attr);
1878 mark_inode_dirty(inode);
1879 return 0;
1880 }
1881
1882 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1883 {
1884 int error;
1885
1886 if (current->journal_info)
1887 return __gfs2_setattr_simple(inode, attr);
1888
1889 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1890 if (error)
1891 return error;
1892
1893 error = __gfs2_setattr_simple(inode, attr);
1894 gfs2_trans_end(GFS2_SB(inode));
1895 return error;
1896 }
1897
1898 static int setattr_chown(struct inode *inode, struct iattr *attr)
1899 {
1900 struct gfs2_inode *ip = GFS2_I(inode);
1901 struct gfs2_sbd *sdp = GFS2_SB(inode);
1902 kuid_t ouid, nuid;
1903 kgid_t ogid, ngid;
1904 int error;
1905 struct gfs2_alloc_parms ap;
1906
1907 ouid = inode->i_uid;
1908 ogid = inode->i_gid;
1909 nuid = attr->ia_uid;
1910 ngid = attr->ia_gid;
1911
1912 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1913 ouid = nuid = NO_UID_QUOTA_CHANGE;
1914 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1915 ogid = ngid = NO_GID_QUOTA_CHANGE;
1916 error = gfs2_qa_get(ip);
1917 if (error)
1918 return error;
1919
1920 error = gfs2_rindex_update(sdp);
1921 if (error)
1922 goto out;
1923
1924 error = gfs2_quota_lock(ip, nuid, ngid);
1925 if (error)
1926 goto out;
1927
1928 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1929
1930 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1931 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1932 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1933 if (error)
1934 goto out_gunlock_q;
1935 }
1936
1937 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1938 if (error)
1939 goto out_gunlock_q;
1940
1941 error = gfs2_setattr_simple(inode, attr);
1942 if (error)
1943 goto out_end_trans;
1944
1945 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1946 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1947 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1948 gfs2_quota_change(ip, ap.target, nuid, ngid);
1949 }
1950
1951 out_end_trans:
1952 gfs2_trans_end(sdp);
1953 out_gunlock_q:
1954 gfs2_quota_unlock(ip);
1955 out:
1956 gfs2_qa_put(ip);
1957 return error;
1958 }
1959
1960 /**
1961 * gfs2_setattr - Change attributes on an inode
1962 * @mnt_userns: User namespace of the mount the inode was found from
1963 * @dentry: The dentry which is changing
1964 * @attr: The structure describing the change
1965 *
1966 * The VFS layer wants to change one or more of an inodes attributes. Write
1967 * that change out to disk.
1968 *
1969 * Returns: errno
1970 */
1971
1972 static int gfs2_setattr(struct user_namespace *mnt_userns,
1973 struct dentry *dentry, struct iattr *attr)
1974 {
1975 struct inode *inode = d_inode(dentry);
1976 struct gfs2_inode *ip = GFS2_I(inode);
1977 struct gfs2_holder i_gh;
1978 int error;
1979
1980 error = gfs2_qa_get(ip);
1981 if (error)
1982 return error;
1983
1984 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1985 if (error)
1986 goto out;
1987
1988 error = may_setattr(&init_user_ns, inode, attr->ia_valid);
1989 if (error)
1990 goto error;
1991
1992 error = setattr_prepare(&init_user_ns, dentry, attr);
1993 if (error)
1994 goto error;
1995
1996 if (attr->ia_valid & ATTR_SIZE)
1997 error = gfs2_setattr_size(inode, attr->ia_size);
1998 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1999 error = setattr_chown(inode, attr);
2000 else {
2001 error = gfs2_setattr_simple(inode, attr);
2002 if (!error && attr->ia_valid & ATTR_MODE)
2003 error = posix_acl_chmod(&init_user_ns, inode,
2004 inode->i_mode);
2005 }
2006
2007 error:
2008 if (!error)
2009 mark_inode_dirty(inode);
2010 gfs2_glock_dq_uninit(&i_gh);
2011 out:
2012 gfs2_qa_put(ip);
2013 return error;
2014 }
2015
2016 /**
2017 * gfs2_getattr - Read out an inode's attributes
2018 * @mnt_userns: user namespace of the mount the inode was found from
2019 * @path: Object to query
2020 * @stat: The inode's stats
2021 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2022 * @flags: AT_STATX_xxx setting
2023 *
2024 * This may be called from the VFS directly, or from within GFS2 with the
2025 * inode locked, so we look to see if the glock is already locked and only
2026 * lock the glock if its not already been done. Note that its the NFS
2027 * readdirplus operation which causes this to be called (from filldir)
2028 * with the glock already held.
2029 *
2030 * Returns: errno
2031 */
2032
2033 static int gfs2_getattr(struct user_namespace *mnt_userns,
2034 const struct path *path, struct kstat *stat,
2035 u32 request_mask, unsigned int flags)
2036 {
2037 struct inode *inode = d_inode(path->dentry);
2038 struct gfs2_inode *ip = GFS2_I(inode);
2039 struct gfs2_holder gh;
2040 u32 gfsflags;
2041 int error;
2042
2043 gfs2_holder_mark_uninitialized(&gh);
2044 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2045 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2046 if (error)
2047 return error;
2048 }
2049
2050 gfsflags = ip->i_diskflags;
2051 if (gfsflags & GFS2_DIF_APPENDONLY)
2052 stat->attributes |= STATX_ATTR_APPEND;
2053 if (gfsflags & GFS2_DIF_IMMUTABLE)
2054 stat->attributes |= STATX_ATTR_IMMUTABLE;
2055
2056 stat->attributes_mask |= (STATX_ATTR_APPEND |
2057 STATX_ATTR_COMPRESSED |
2058 STATX_ATTR_ENCRYPTED |
2059 STATX_ATTR_IMMUTABLE |
2060 STATX_ATTR_NODUMP);
2061
2062 generic_fillattr(&init_user_ns, inode, stat);
2063
2064 if (gfs2_holder_initialized(&gh))
2065 gfs2_glock_dq_uninit(&gh);
2066
2067 return 0;
2068 }
2069
2070 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2071 u64 start, u64 len)
2072 {
2073 struct gfs2_inode *ip = GFS2_I(inode);
2074 struct gfs2_holder gh;
2075 int ret;
2076
2077 inode_lock_shared(inode);
2078
2079 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2080 if (ret)
2081 goto out;
2082
2083 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2084
2085 gfs2_glock_dq_uninit(&gh);
2086
2087 out:
2088 inode_unlock_shared(inode);
2089 return ret;
2090 }
2091
2092 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2093 {
2094 struct inode *inode = file->f_mapping->host;
2095 struct gfs2_inode *ip = GFS2_I(inode);
2096 struct gfs2_holder gh;
2097 loff_t ret;
2098
2099 inode_lock_shared(inode);
2100 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2101 if (!ret)
2102 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2103 gfs2_glock_dq_uninit(&gh);
2104 inode_unlock_shared(inode);
2105
2106 if (ret < 0)
2107 return ret;
2108 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2109 }
2110
2111 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2112 {
2113 struct inode *inode = file->f_mapping->host;
2114 struct gfs2_inode *ip = GFS2_I(inode);
2115 struct gfs2_holder gh;
2116 loff_t ret;
2117
2118 inode_lock_shared(inode);
2119 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2120 if (!ret)
2121 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2122 gfs2_glock_dq_uninit(&gh);
2123 inode_unlock_shared(inode);
2124
2125 if (ret < 0)
2126 return ret;
2127 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2128 }
2129
2130 static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2131 int flags)
2132 {
2133 struct gfs2_inode *ip = GFS2_I(inode);
2134 struct gfs2_glock *gl = ip->i_gl;
2135 struct gfs2_holder *gh;
2136 int error;
2137
2138 gh = gfs2_glock_is_locked_by_me(gl);
2139 if (gh && !gfs2_glock_is_held_excl(gl)) {
2140 gfs2_glock_dq(gh);
2141 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2142 error = gfs2_glock_nq(gh);
2143 if (error)
2144 return error;
2145 }
2146 return generic_update_time(inode, time, flags);
2147 }
2148
2149 static const struct inode_operations gfs2_file_iops = {
2150 .permission = gfs2_permission,
2151 .setattr = gfs2_setattr,
2152 .getattr = gfs2_getattr,
2153 .listxattr = gfs2_listxattr,
2154 .fiemap = gfs2_fiemap,
2155 .get_acl = gfs2_get_acl,
2156 .set_acl = gfs2_set_acl,
2157 .update_time = gfs2_update_time,
2158 .fileattr_get = gfs2_fileattr_get,
2159 .fileattr_set = gfs2_fileattr_set,
2160 };
2161
2162 static const struct inode_operations gfs2_dir_iops = {
2163 .create = gfs2_create,
2164 .lookup = gfs2_lookup,
2165 .link = gfs2_link,
2166 .unlink = gfs2_unlink,
2167 .symlink = gfs2_symlink,
2168 .mkdir = gfs2_mkdir,
2169 .rmdir = gfs2_unlink,
2170 .mknod = gfs2_mknod,
2171 .rename = gfs2_rename2,
2172 .permission = gfs2_permission,
2173 .setattr = gfs2_setattr,
2174 .getattr = gfs2_getattr,
2175 .listxattr = gfs2_listxattr,
2176 .fiemap = gfs2_fiemap,
2177 .get_acl = gfs2_get_acl,
2178 .set_acl = gfs2_set_acl,
2179 .update_time = gfs2_update_time,
2180 .atomic_open = gfs2_atomic_open,
2181 .fileattr_get = gfs2_fileattr_get,
2182 .fileattr_set = gfs2_fileattr_set,
2183 };
2184
2185 static const struct inode_operations gfs2_symlink_iops = {
2186 .get_link = gfs2_get_link,
2187 .permission = gfs2_permission,
2188 .setattr = gfs2_setattr,
2189 .getattr = gfs2_getattr,
2190 .listxattr = gfs2_listxattr,
2191 .fiemap = gfs2_fiemap,
2192 };
2193
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