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drm/panthor: Don't add write fences to the shared BOs
[drm/drm-misc.git] / fs / gfs2 / inode.c
blob1b95db2c3aac3c9a9d5d881985e70622342b52ab
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 /**
44 * gfs2_set_iop - Sets inode operations
45 * @inode: The inode with correct i_mode filled in
46 *
47 * GFS2 lookup code fills in vfs inode contents based on info obtained
48 * from directory entry inside gfs2_inode_lookup().
49 */
50
51 static void gfs2_set_iop(struct inode *inode)
52 {
53 struct gfs2_sbd *sdp = GFS2_SB(inode);
54 umode_t mode = inode->i_mode;
55
56 if (S_ISREG(mode)) {
57 inode->i_op = &gfs2_file_iops;
58 if (gfs2_localflocks(sdp))
59 inode->i_fop = &gfs2_file_fops_nolock;
60 else
61 inode->i_fop = &gfs2_file_fops;
62 } else if (S_ISDIR(mode)) {
63 inode->i_op = &gfs2_dir_iops;
64 if (gfs2_localflocks(sdp))
65 inode->i_fop = &gfs2_dir_fops_nolock;
66 else
67 inode->i_fop = &gfs2_dir_fops;
68 } else if (S_ISLNK(mode)) {
69 inode->i_op = &gfs2_symlink_iops;
70 } else {
71 inode->i_op = &gfs2_file_iops;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
73 }
74 }
75
76 static int iget_test(struct inode *inode, void *opaque)
77 {
78 u64 no_addr = *(u64 *)opaque;
79
80 return GFS2_I(inode)->i_no_addr == no_addr;
81 }
82
83 static int iget_set(struct inode *inode, void *opaque)
84 {
85 u64 no_addr = *(u64 *)opaque;
86
87 GFS2_I(inode)->i_no_addr = no_addr;
88 inode->i_ino = no_addr;
89 return 0;
90 }
91
92 /**
93 * gfs2_inode_lookup - Lookup an inode
94 * @sb: The super block
95 * @type: The type of the inode
96 * @no_addr: The inode number
97 * @no_formal_ino: The inode generation number
98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99 * GFS2_BLKST_FREE to indicate not to verify)
100 *
101 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
102 *
103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104 * placeholder because it doesn't otherwise make sense), the on-disk block type
105 * is verified to be @blktype.
106 *
107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108 * if it detects that @no_formal_ino doesn't match the actual inode generation
109 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
110 *
111 * Returns: A VFS inode, or an error
112 */
113
114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115 u64 no_addr, u64 no_formal_ino,
116 unsigned int blktype)
117 {
118 struct inode *inode;
119 struct gfs2_inode *ip;
120 struct gfs2_holder i_gh;
121 int error;
122
123 gfs2_holder_mark_uninitialized(&i_gh);
124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
125 if (!inode)
126 return ERR_PTR(-ENOMEM);
127
128 ip = GFS2_I(inode);
129
130 if (inode->i_state & I_NEW) {
131 struct gfs2_sbd *sdp = GFS2_SB(inode);
132 struct gfs2_glock *io_gl;
133 int extra_flags = 0;
134
135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
136 &ip->i_gl);
137 if (unlikely(error))
138 goto fail;
139
140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
141 &io_gl);
142 if (unlikely(error))
143 goto fail;
144
145 /*
146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147 * delete_work_func(). Make sure not to cancel the delete work
148 * from within itself here.
149 */
150 if (blktype == GFS2_BLKST_UNLINKED)
151 extra_flags |= LM_FLAG_TRY;
152 else
153 gfs2_cancel_delete_work(io_gl);
154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
155 GL_EXACT | GL_NOPID | extra_flags,
156 &ip->i_iopen_gh);
157 gfs2_glock_put(io_gl);
158 if (unlikely(error))
159 goto fail;
160
161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
162 /*
163 * The GL_SKIP flag indicates to skip reading the inode
164 * block. We read the inode when instantiating it
165 * after possibly checking the block type.
166 */
167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
168 GL_SKIP, &i_gh);
169 if (error)
170 goto fail;
171
172 error = -ESTALE;
173 if (no_formal_ino &&
174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
175 goto fail;
176
177 if (blktype != GFS2_BLKST_FREE) {
178 error = gfs2_check_blk_type(sdp, no_addr,
179 blktype);
180 if (error)
181 goto fail;
182 }
183 }
184
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
186
187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188 inode_set_atime(inode,
189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
190 0);
191
192 glock_set_object(ip->i_gl, ip);
193
194 if (type == DT_UNKNOWN) {
195 /* Inode glock must be locked already */
196 error = gfs2_instantiate(&i_gh);
197 if (error) {
198 glock_clear_object(ip->i_gl, ip);
199 goto fail;
200 }
201 } else {
202 ip->i_no_formal_ino = no_formal_ino;
203 inode->i_mode = DT2IF(type);
204 }
205
206 if (gfs2_holder_initialized(&i_gh))
207 gfs2_glock_dq_uninit(&i_gh);
208 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
209
210 gfs2_set_iop(inode);
211 unlock_new_inode(inode);
212 }
213
214 if (no_formal_ino && ip->i_no_formal_ino &&
215 no_formal_ino != ip->i_no_formal_ino) {
216 iput(inode);
217 return ERR_PTR(-ESTALE);
218 }
219
220 return inode;
221
222 fail:
223 if (error == GLR_TRYFAILED)
224 error = -EAGAIN;
225 if (gfs2_holder_initialized(&ip->i_iopen_gh))
226 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
227 if (gfs2_holder_initialized(&i_gh))
228 gfs2_glock_dq_uninit(&i_gh);
229 if (ip->i_gl) {
230 gfs2_glock_put(ip->i_gl);
231 ip->i_gl = NULL;
232 }
233 iget_failed(inode);
234 return ERR_PTR(error);
235 }
236
237 /**
238 * gfs2_lookup_by_inum - look up an inode by inode number
239 * @sdp: The super block
240 * @no_addr: The inode number
241 * @no_formal_ino: The inode generation number (0 for any)
242 * @blktype: Requested block type (see gfs2_inode_lookup)
243 */
244 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
245 u64 no_formal_ino, unsigned int blktype)
246 {
247 struct super_block *sb = sdp->sd_vfs;
248 struct inode *inode;
249 int error;
250
251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
252 blktype);
253 if (IS_ERR(inode))
254 return inode;
255
256 if (no_formal_ino) {
257 error = -EIO;
258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
259 goto fail_iput;
260 }
261 return inode;
262
263 fail_iput:
264 iput(inode);
265 return ERR_PTR(error);
266 }
267
268
269 /**
270 * gfs2_lookup_meta - Look up an inode in a metadata directory
271 * @dip: The directory
272 * @name: The name of the inode
273 */
274 struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
275 {
276 struct qstr qstr;
277 struct inode *inode;
278
279 gfs2_str2qstr(&qstr, name);
280 inode = gfs2_lookupi(dip, &qstr, 1);
281 if (IS_ERR_OR_NULL(inode))
282 return inode ? inode : ERR_PTR(-ENOENT);
283
284 /*
285 * Must not call back into the filesystem when allocating
286 * pages in the metadata inode's address space.
287 */
288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
289
290 return inode;
291 }
292
293
294 /**
295 * gfs2_lookupi - Look up a filename in a directory and return its inode
296 * @dir: The inode of the directory containing the inode to look-up
297 * @name: The name of the inode to look for
298 * @is_root: If 1, ignore the caller's permissions
299 *
300 * This can be called via the VFS filldir function when NFS is doing
301 * a readdirplus and the inode which its intending to stat isn't
302 * already in cache. In this case we must not take the directory glock
303 * again, since the readdir call will have already taken that lock.
304 *
305 * Returns: errno
306 */
307
308 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
309 int is_root)
310 {
311 struct super_block *sb = dir->i_sb;
312 struct gfs2_inode *dip = GFS2_I(dir);
313 struct gfs2_holder d_gh;
314 int error = 0;
315 struct inode *inode = NULL;
316
317 gfs2_holder_mark_uninitialized(&d_gh);
318 if (!name->len || name->len > GFS2_FNAMESIZE)
319 return ERR_PTR(-ENAMETOOLONG);
320
321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
323 dir == d_inode(sb->s_root))) {
324 igrab(dir);
325 return dir;
326 }
327
328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
330 if (error)
331 return ERR_PTR(error);
332 }
333
334 if (!is_root) {
335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
336 if (error)
337 goto out;
338 }
339
340 inode = gfs2_dir_search(dir, name, false);
341 if (IS_ERR(inode))
342 error = PTR_ERR(inode);
343 out:
344 if (gfs2_holder_initialized(&d_gh))
345 gfs2_glock_dq_uninit(&d_gh);
346 if (error == -ENOENT)
347 return NULL;
348 return inode ? inode : ERR_PTR(error);
349 }
350
351 /**
352 * create_ok - OK to create a new on-disk inode here?
353 * @dip: Directory in which dinode is to be created
354 * @name: Name of new dinode
355 * @mode:
356 *
357 * Returns: errno
358 */
359
360 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
361 umode_t mode)
362 {
363 int error;
364
365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
366 MAY_WRITE | MAY_EXEC);
367 if (error)
368 return error;
369
370 /* Don't create entries in an unlinked directory */
371 if (!dip->i_inode.i_nlink)
372 return -ENOENT;
373
374 if (dip->i_entries == (u32)-1)
375 return -EFBIG;
376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
377 return -EMLINK;
378
379 return 0;
380 }
381
382 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
383 struct inode *inode)
384 {
385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
386 (dip->i_inode.i_mode & S_ISUID) &&
387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
388 if (S_ISDIR(inode->i_mode))
389 inode->i_mode |= S_ISUID;
390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
391 inode->i_mode &= ~07111;
392 inode->i_uid = dip->i_inode.i_uid;
393 } else
394 inode->i_uid = current_fsuid();
395
396 if (dip->i_inode.i_mode & S_ISGID) {
397 if (S_ISDIR(inode->i_mode))
398 inode->i_mode |= S_ISGID;
399 inode->i_gid = dip->i_inode.i_gid;
400 } else
401 inode->i_gid = current_fsgid();
402 }
403
404 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
405 {
406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
408 int error;
409
410 error = gfs2_quota_lock_check(ip, &ap);
411 if (error)
412 goto out;
413
414 error = gfs2_inplace_reserve(ip, &ap);
415 if (error)
416 goto out_quota;
417
418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
419 if (error)
420 goto out_ipreserv;
421
422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1);
423 if (error)
424 goto out_trans_end;
425
426 ip->i_no_formal_ino = ip->i_generation;
427 ip->i_inode.i_ino = ip->i_no_addr;
428 ip->i_goal = ip->i_no_addr;
429 if (*dblocks > 1)
430 ip->i_eattr = ip->i_no_addr + 1;
431
432 out_trans_end:
433 gfs2_trans_end(sdp);
434 out_ipreserv:
435 gfs2_inplace_release(ip);
436 out_quota:
437 gfs2_quota_unlock(ip);
438 out:
439 return error;
440 }
441
442 static void gfs2_init_dir(struct buffer_head *dibh,
443 const struct gfs2_inode *parent)
444 {
445 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
446 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
447
448 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
449 dent->de_inum = di->di_num; /* already GFS2 endian */
450 dent->de_type = cpu_to_be16(DT_DIR);
451
452 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
453 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
454 gfs2_inum_out(parent, dent);
455 dent->de_type = cpu_to_be16(DT_DIR);
456
457 }
458
459 /**
460 * gfs2_init_xattr - Initialise an xattr block for a new inode
461 * @ip: The inode in question
462 *
463 * This sets up an empty xattr block for a new inode, ready to
464 * take any ACLs, LSM xattrs, etc.
465 */
466
467 static void gfs2_init_xattr(struct gfs2_inode *ip)
468 {
469 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
470 struct buffer_head *bh;
471 struct gfs2_ea_header *ea;
472
473 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
474 gfs2_trans_add_meta(ip->i_gl, bh);
475 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
476 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
477
478 ea = GFS2_EA_BH2FIRST(bh);
479 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
480 ea->ea_type = GFS2_EATYPE_UNUSED;
481 ea->ea_flags = GFS2_EAFLAG_LAST;
482
483 brelse(bh);
484 }
485
486 /**
487 * init_dinode - Fill in a new dinode structure
488 * @dip: The directory this inode is being created in
489 * @ip: The inode
490 * @symname: The symlink destination (if a symlink)
491 *
492 */
493
494 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
495 const char *symname)
496 {
497 struct gfs2_dinode *di;
498 struct buffer_head *dibh;
499
500 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
501 gfs2_trans_add_meta(ip->i_gl, dibh);
502 di = (struct gfs2_dinode *)dibh->b_data;
503 gfs2_dinode_out(ip, di);
504
505 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
506 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
507 di->__pad1 = 0;
508 di->__pad2 = 0;
509 di->__pad3 = 0;
510 memset(&di->__pad4, 0, sizeof(di->__pad4));
511 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
512 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
513
514 switch(ip->i_inode.i_mode & S_IFMT) {
515 case S_IFDIR:
516 gfs2_init_dir(dibh, dip);
517 break;
518 case S_IFLNK:
519 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
520 break;
521 }
522
523 set_buffer_uptodate(dibh);
524 brelse(dibh);
525 }
526
527 /**
528 * gfs2_trans_da_blks - Calculate number of blocks to link inode
529 * @dip: The directory we are linking into
530 * @da: The dir add information
531 * @nr_inodes: The number of inodes involved
532 *
533 * This calculate the number of blocks we need to reserve in a
534 * transaction to link @nr_inodes into a directory. In most cases
535 * @nr_inodes will be 2 (the directory plus the inode being linked in)
536 * but in case of rename, 4 may be required.
537 *
538 * Returns: Number of blocks
539 */
540
541 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
542 const struct gfs2_diradd *da,
543 unsigned nr_inodes)
544 {
545 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
546 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
547 }
548
549 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550 struct gfs2_inode *ip, struct gfs2_diradd *da)
551 {
552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
553 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
554 int error;
555
556 if (da->nr_blocks) {
557 error = gfs2_quota_lock_check(dip, &ap);
558 if (error)
559 goto fail_quota_locks;
560
561 error = gfs2_inplace_reserve(dip, &ap);
562 if (error)
563 goto fail_quota_locks;
564
565 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
566 if (error)
567 goto fail_ipreserv;
568 } else {
569 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
570 if (error)
571 goto fail_quota_locks;
572 }
573
574 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
575
576 gfs2_trans_end(sdp);
577 fail_ipreserv:
578 gfs2_inplace_release(dip);
579 fail_quota_locks:
580 gfs2_quota_unlock(dip);
581 return error;
582 }
583
584 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
585 void *fs_info)
586 {
587 const struct xattr *xattr;
588 int err = 0;
589
590 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
591 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
592 xattr->value_len, 0,
593 GFS2_EATYPE_SECURITY);
594 if (err < 0)
595 break;
596 }
597 return err;
598 }
599
600 /**
601 * gfs2_create_inode - Create a new inode
602 * @dir: The parent directory
603 * @dentry: The new dentry
604 * @file: If non-NULL, the file which is being opened
605 * @mode: The permissions on the new inode
606 * @dev: For device nodes, this is the device number
607 * @symname: For symlinks, this is the link destination
608 * @size: The initial size of the inode (ignored for directories)
609 * @excl: Force fail if inode exists
610 *
611 * FIXME: Change to allocate the disk blocks and write them out in the same
612 * transaction. That way, we can no longer end up in a situation in which an
613 * inode is allocated, the node crashes, and the block looks like a valid
614 * inode. (With atomic creates in place, we will also no longer need to zero
615 * the link count and dirty the inode here on failure.)
616 *
617 * Returns: 0 on success, or error code
618 */
619
620 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
621 struct file *file,
622 umode_t mode, dev_t dev, const char *symname,
623 unsigned int size, int excl)
624 {
625 const struct qstr *name = &dentry->d_name;
626 struct posix_acl *default_acl, *acl;
627 struct gfs2_holder d_gh, gh;
628 struct inode *inode = NULL;
629 struct gfs2_inode *dip = GFS2_I(dir), *ip;
630 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
631 struct gfs2_glock *io_gl;
632 int error;
633 u32 aflags = 0;
634 unsigned blocks = 1;
635 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
636
637 if (!name->len || name->len > GFS2_FNAMESIZE)
638 return -ENAMETOOLONG;
639
640 error = gfs2_qa_get(dip);
641 if (error)
642 return error;
643
644 error = gfs2_rindex_update(sdp);
645 if (error)
646 goto fail;
647
648 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
649 if (error)
650 goto fail;
651 gfs2_holder_mark_uninitialized(&gh);
652
653 error = create_ok(dip, name, mode);
654 if (error)
655 goto fail_gunlock;
656
657 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
658 error = PTR_ERR(inode);
659 if (!IS_ERR(inode)) {
660 if (S_ISDIR(inode->i_mode)) {
661 iput(inode);
662 inode = ERR_PTR(-EISDIR);
663 goto fail_gunlock;
664 }
665 d_instantiate(dentry, inode);
666 error = 0;
667 if (file) {
668 if (S_ISREG(inode->i_mode))
669 error = finish_open(file, dentry, gfs2_open_common);
670 else
671 error = finish_no_open(file, NULL);
672 }
673 gfs2_glock_dq_uninit(&d_gh);
674 goto fail;
675 } else if (error != -ENOENT) {
676 goto fail_gunlock;
677 }
678
679 error = gfs2_diradd_alloc_required(dir, name, &da);
680 if (error < 0)
681 goto fail_gunlock;
682
683 inode = new_inode(sdp->sd_vfs);
684 error = -ENOMEM;
685 if (!inode)
686 goto fail_gunlock;
687 ip = GFS2_I(inode);
688
689 error = posix_acl_create(dir, &mode, &default_acl, &acl);
690 if (error)
691 goto fail_gunlock;
692
693 error = gfs2_qa_get(ip);
694 if (error)
695 goto fail_free_acls;
696
697 inode->i_mode = mode;
698 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
699 inode->i_rdev = dev;
700 inode->i_size = size;
701 simple_inode_init_ts(inode);
702 munge_mode_uid_gid(dip, inode);
703 check_and_update_goal(dip);
704 ip->i_goal = dip->i_goal;
705 ip->i_diskflags = 0;
706 ip->i_eattr = 0;
707 ip->i_height = 0;
708 ip->i_depth = 0;
709 ip->i_entries = 0;
710 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
711
712 switch(mode & S_IFMT) {
713 case S_IFREG:
714 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
715 gfs2_tune_get(sdp, gt_new_files_jdata))
716 ip->i_diskflags |= GFS2_DIF_JDATA;
717 gfs2_set_aops(inode);
718 break;
719 case S_IFDIR:
720 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
721 ip->i_diskflags |= GFS2_DIF_JDATA;
722 ip->i_entries = 2;
723 break;
724 }
725
726 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
727 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
728 ip->i_diskflags |= GFS2_DIF_SYSTEM;
729
730 gfs2_set_inode_flags(inode);
731
732 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
733 (dip->i_diskflags & GFS2_DIF_TOPDIR))
734 aflags |= GFS2_AF_ORLOV;
735
736 if (default_acl || acl)
737 blocks++;
738
739 error = alloc_dinode(ip, aflags, &blocks);
740 if (error)
741 goto fail_free_inode;
742
743 gfs2_set_inode_blocks(inode, blocks);
744
745 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
746 if (error)
747 goto fail_free_inode;
748
749 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
750 if (error)
751 goto fail_free_inode;
752 gfs2_cancel_delete_work(io_gl);
753
754 retry:
755 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
756 if (error == -EBUSY)
757 goto retry;
758 if (error)
759 goto fail_gunlock2;
760
761 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
762 &ip->i_iopen_gh);
763 if (error)
764 goto fail_gunlock2;
765
766 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
767 if (error)
768 goto fail_gunlock3;
769
770 error = gfs2_trans_begin(sdp, blocks, 0);
771 if (error)
772 goto fail_gunlock3;
773
774 if (blocks > 1)
775 gfs2_init_xattr(ip);
776 init_dinode(dip, ip, symname);
777 gfs2_trans_end(sdp);
778
779 glock_set_object(ip->i_gl, ip);
780 glock_set_object(io_gl, ip);
781 gfs2_set_iop(inode);
782
783 if (default_acl) {
784 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
785 if (error)
786 goto fail_gunlock4;
787 posix_acl_release(default_acl);
788 default_acl = NULL;
789 }
790 if (acl) {
791 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
792 if (error)
793 goto fail_gunlock4;
794 posix_acl_release(acl);
795 acl = NULL;
796 }
797
798 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
799 &gfs2_initxattrs, NULL);
800 if (error)
801 goto fail_gunlock4;
802
803 error = link_dinode(dip, name, ip, &da);
804 if (error)
805 goto fail_gunlock4;
806
807 mark_inode_dirty(inode);
808 d_instantiate(dentry, inode);
809 /* After instantiate, errors should result in evict which will destroy
810 * both inode and iopen glocks properly. */
811 if (file) {
812 file->f_mode |= FMODE_CREATED;
813 error = finish_open(file, dentry, gfs2_open_common);
814 }
815 gfs2_glock_dq_uninit(&d_gh);
816 gfs2_qa_put(ip);
817 gfs2_glock_dq_uninit(&gh);
818 gfs2_glock_put(io_gl);
819 gfs2_qa_put(dip);
820 unlock_new_inode(inode);
821 return error;
822
823 fail_gunlock4:
824 glock_clear_object(ip->i_gl, ip);
825 glock_clear_object(io_gl, ip);
826 fail_gunlock3:
827 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
828 fail_gunlock2:
829 gfs2_glock_put(io_gl);
830 fail_free_inode:
831 if (ip->i_gl) {
832 gfs2_glock_put(ip->i_gl);
833 ip->i_gl = NULL;
834 }
835 gfs2_rs_deltree(&ip->i_res);
836 gfs2_qa_put(ip);
837 fail_free_acls:
838 posix_acl_release(default_acl);
839 posix_acl_release(acl);
840 fail_gunlock:
841 gfs2_dir_no_add(&da);
842 gfs2_glock_dq_uninit(&d_gh);
843 if (!IS_ERR_OR_NULL(inode)) {
844 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
845 clear_nlink(inode);
846 if (ip->i_no_addr)
847 mark_inode_dirty(inode);
848 if (inode->i_state & I_NEW)
849 iget_failed(inode);
850 else
851 iput(inode);
852 }
853 if (gfs2_holder_initialized(&gh))
854 gfs2_glock_dq_uninit(&gh);
855 fail:
856 gfs2_qa_put(dip);
857 return error;
858 }
859
860 /**
861 * gfs2_create - Create a file
862 * @idmap: idmap of the mount the inode was found from
863 * @dir: The directory in which to create the file
864 * @dentry: The dentry of the new file
865 * @mode: The mode of the new file
866 * @excl: Force fail if inode exists
867 *
868 * Returns: errno
869 */
870
871 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
872 struct dentry *dentry, umode_t mode, bool excl)
873 {
874 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
875 }
876
877 /**
878 * __gfs2_lookup - Look up a filename in a directory and return its inode
879 * @dir: The directory inode
880 * @dentry: The dentry of the new inode
881 * @file: File to be opened
882 *
883 *
884 * Returns: errno
885 */
886
887 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
888 struct file *file)
889 {
890 struct inode *inode;
891 struct dentry *d;
892 struct gfs2_holder gh;
893 struct gfs2_glock *gl;
894 int error;
895
896 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
897 if (inode == NULL) {
898 d_add(dentry, NULL);
899 return NULL;
900 }
901 if (IS_ERR(inode))
902 return ERR_CAST(inode);
903
904 gl = GFS2_I(inode)->i_gl;
905 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
906 if (error) {
907 iput(inode);
908 return ERR_PTR(error);
909 }
910
911 d = d_splice_alias(inode, dentry);
912 if (IS_ERR(d)) {
913 gfs2_glock_dq_uninit(&gh);
914 return d;
915 }
916 if (file && S_ISREG(inode->i_mode))
917 error = finish_open(file, dentry, gfs2_open_common);
918
919 gfs2_glock_dq_uninit(&gh);
920 if (error) {
921 dput(d);
922 return ERR_PTR(error);
923 }
924 return d;
925 }
926
927 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
928 unsigned flags)
929 {
930 return __gfs2_lookup(dir, dentry, NULL);
931 }
932
933 /**
934 * gfs2_link - Link to a file
935 * @old_dentry: The inode to link
936 * @dir: Add link to this directory
937 * @dentry: The name of the link
938 *
939 * Link the inode in "old_dentry" into the directory "dir" with the
940 * name in "dentry".
941 *
942 * Returns: errno
943 */
944
945 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
946 struct dentry *dentry)
947 {
948 struct gfs2_inode *dip = GFS2_I(dir);
949 struct gfs2_sbd *sdp = GFS2_SB(dir);
950 struct inode *inode = d_inode(old_dentry);
951 struct gfs2_inode *ip = GFS2_I(inode);
952 struct gfs2_holder d_gh, gh;
953 struct buffer_head *dibh;
954 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
955 int error;
956
957 if (S_ISDIR(inode->i_mode))
958 return -EPERM;
959
960 error = gfs2_qa_get(dip);
961 if (error)
962 return error;
963
964 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
965 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
966
967 error = gfs2_glock_nq(&d_gh);
968 if (error)
969 goto out_parent;
970
971 error = gfs2_glock_nq(&gh);
972 if (error)
973 goto out_child;
974
975 error = -ENOENT;
976 if (inode->i_nlink == 0)
977 goto out_gunlock;
978
979 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
980 if (error)
981 goto out_gunlock;
982
983 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
984 switch (error) {
985 case -ENOENT:
986 break;
987 case 0:
988 error = -EEXIST;
989 goto out_gunlock;
990 default:
991 goto out_gunlock;
992 }
993
994 error = -EINVAL;
995 if (!dip->i_inode.i_nlink)
996 goto out_gunlock;
997 error = -EFBIG;
998 if (dip->i_entries == (u32)-1)
999 goto out_gunlock;
1000 error = -EPERM;
1001 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1002 goto out_gunlock;
1003 error = -EMLINK;
1004 if (ip->i_inode.i_nlink == (u32)-1)
1005 goto out_gunlock;
1006
1007 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1008 if (error < 0)
1009 goto out_gunlock;
1010
1011 if (da.nr_blocks) {
1012 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1013 error = gfs2_quota_lock_check(dip, &ap);
1014 if (error)
1015 goto out_gunlock;
1016
1017 error = gfs2_inplace_reserve(dip, &ap);
1018 if (error)
1019 goto out_gunlock_q;
1020
1021 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1022 if (error)
1023 goto out_ipres;
1024 } else {
1025 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1026 if (error)
1027 goto out_ipres;
1028 }
1029
1030 error = gfs2_meta_inode_buffer(ip, &dibh);
1031 if (error)
1032 goto out_end_trans;
1033
1034 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1035 if (error)
1036 goto out_brelse;
1037
1038 gfs2_trans_add_meta(ip->i_gl, dibh);
1039 inc_nlink(&ip->i_inode);
1040 inode_set_ctime_current(&ip->i_inode);
1041 ihold(inode);
1042 d_instantiate(dentry, inode);
1043 mark_inode_dirty(inode);
1044
1045 out_brelse:
1046 brelse(dibh);
1047 out_end_trans:
1048 gfs2_trans_end(sdp);
1049 out_ipres:
1050 if (da.nr_blocks)
1051 gfs2_inplace_release(dip);
1052 out_gunlock_q:
1053 if (da.nr_blocks)
1054 gfs2_quota_unlock(dip);
1055 out_gunlock:
1056 gfs2_dir_no_add(&da);
1057 gfs2_glock_dq(&gh);
1058 out_child:
1059 gfs2_glock_dq(&d_gh);
1060 out_parent:
1061 gfs2_qa_put(dip);
1062 gfs2_holder_uninit(&d_gh);
1063 gfs2_holder_uninit(&gh);
1064 return error;
1065 }
1066
1067 /*
1068 * gfs2_unlink_ok - check to see that a inode is still in a directory
1069 * @dip: the directory
1070 * @name: the name of the file
1071 * @ip: the inode
1072 *
1073 * Assumes that the lock on (at least) @dip is held.
1074 *
1075 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1076 */
1077
1078 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1079 const struct gfs2_inode *ip)
1080 {
1081 int error;
1082
1083 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1084 return -EPERM;
1085
1086 if ((dip->i_inode.i_mode & S_ISVTX) &&
1087 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1088 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1089 return -EPERM;
1090
1091 if (IS_APPEND(&dip->i_inode))
1092 return -EPERM;
1093
1094 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1095 MAY_WRITE | MAY_EXEC);
1096 if (error)
1097 return error;
1098
1099 return gfs2_dir_check(&dip->i_inode, name, ip);
1100 }
1101
1102 /**
1103 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1104 * @dip: The parent directory
1105 * @dentry: The dentry to unlink
1106 *
1107 * Called with all the locks and in a transaction. This will only be
1108 * called for a directory after it has been checked to ensure it is empty.
1109 *
1110 * Returns: 0 on success, or an error
1111 */
1112
1113 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1114 const struct dentry *dentry)
1115 {
1116 struct inode *inode = d_inode(dentry);
1117 struct gfs2_inode *ip = GFS2_I(inode);
1118 int error;
1119
1120 error = gfs2_dir_del(dip, dentry);
1121 if (error)
1122 return error;
1123
1124 ip->i_entries = 0;
1125 inode_set_ctime_current(inode);
1126 if (S_ISDIR(inode->i_mode))
1127 clear_nlink(inode);
1128 else
1129 drop_nlink(inode);
1130 mark_inode_dirty(inode);
1131 if (inode->i_nlink == 0)
1132 gfs2_unlink_di(inode);
1133 return 0;
1134 }
1135
1136
1137 /**
1138 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1139 * @dir: The inode of the directory containing the inode to unlink
1140 * @dentry: The file itself
1141 *
1142 * This routine uses the type of the inode as a flag to figure out
1143 * whether this is an unlink or an rmdir.
1144 *
1145 * Returns: errno
1146 */
1147
1148 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1149 {
1150 struct gfs2_inode *dip = GFS2_I(dir);
1151 struct gfs2_sbd *sdp = GFS2_SB(dir);
1152 struct inode *inode = d_inode(dentry);
1153 struct gfs2_inode *ip = GFS2_I(inode);
1154 struct gfs2_holder d_gh, r_gh, gh;
1155 struct gfs2_rgrpd *rgd;
1156 int error;
1157
1158 error = gfs2_rindex_update(sdp);
1159 if (error)
1160 return error;
1161
1162 error = -EROFS;
1163
1164 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1165 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1166
1167 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1168 if (!rgd)
1169 goto out_inodes;
1170
1171 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1172
1173
1174 error = gfs2_glock_nq(&d_gh);
1175 if (error)
1176 goto out_parent;
1177
1178 error = gfs2_glock_nq(&gh);
1179 if (error)
1180 goto out_child;
1181
1182 error = -ENOENT;
1183 if (inode->i_nlink == 0)
1184 goto out_rgrp;
1185
1186 if (S_ISDIR(inode->i_mode)) {
1187 error = -ENOTEMPTY;
1188 if (ip->i_entries > 2 || inode->i_nlink > 2)
1189 goto out_rgrp;
1190 }
1191
1192 error = gfs2_glock_nq(&r_gh); /* rgrp */
1193 if (error)
1194 goto out_rgrp;
1195
1196 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1197 if (error)
1198 goto out_gunlock;
1199
1200 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1201 if (error)
1202 goto out_gunlock;
1203
1204 error = gfs2_unlink_inode(dip, dentry);
1205 gfs2_trans_end(sdp);
1206
1207 out_gunlock:
1208 gfs2_glock_dq(&r_gh);
1209 out_rgrp:
1210 gfs2_glock_dq(&gh);
1211 out_child:
1212 gfs2_glock_dq(&d_gh);
1213 out_parent:
1214 gfs2_holder_uninit(&r_gh);
1215 out_inodes:
1216 gfs2_holder_uninit(&gh);
1217 gfs2_holder_uninit(&d_gh);
1218 return error;
1219 }
1220
1221 /**
1222 * gfs2_symlink - Create a symlink
1223 * @idmap: idmap of the mount the inode was found from
1224 * @dir: The directory to create the symlink in
1225 * @dentry: The dentry to put the symlink in
1226 * @symname: The thing which the link points to
1227 *
1228 * Returns: errno
1229 */
1230
1231 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1232 struct dentry *dentry, const char *symname)
1233 {
1234 unsigned int size;
1235
1236 size = strlen(symname);
1237 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1238 return -ENAMETOOLONG;
1239
1240 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1241 }
1242
1243 /**
1244 * gfs2_mkdir - Make a directory
1245 * @idmap: idmap of the mount the inode was found from
1246 * @dir: The parent directory of the new one
1247 * @dentry: The dentry of the new directory
1248 * @mode: The mode of the new directory
1249 *
1250 * Returns: errno
1251 */
1252
1253 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1254 struct dentry *dentry, umode_t mode)
1255 {
1256 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1257 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1258 }
1259
1260 /**
1261 * gfs2_mknod - Make a special file
1262 * @idmap: idmap of the mount the inode was found from
1263 * @dir: The directory in which the special file will reside
1264 * @dentry: The dentry of the special file
1265 * @mode: The mode of the special file
1266 * @dev: The device specification of the special file
1267 *
1268 */
1269
1270 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1271 struct dentry *dentry, umode_t mode, dev_t dev)
1272 {
1273 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1274 }
1275
1276 /**
1277 * gfs2_atomic_open - Atomically open a file
1278 * @dir: The directory
1279 * @dentry: The proposed new entry
1280 * @file: The proposed new struct file
1281 * @flags: open flags
1282 * @mode: File mode
1283 *
1284 * Returns: error code or 0 for success
1285 */
1286
1287 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1288 struct file *file, unsigned flags,
1289 umode_t mode)
1290 {
1291 struct dentry *d;
1292 bool excl = !!(flags & O_EXCL);
1293
1294 if (!d_in_lookup(dentry))
1295 goto skip_lookup;
1296
1297 d = __gfs2_lookup(dir, dentry, file);
1298 if (IS_ERR(d))
1299 return PTR_ERR(d);
1300 if (d != NULL)
1301 dentry = d;
1302 if (d_really_is_positive(dentry)) {
1303 if (!(file->f_mode & FMODE_OPENED))
1304 return finish_no_open(file, d);
1305 dput(d);
1306 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1307 }
1308
1309 BUG_ON(d != NULL);
1310
1311 skip_lookup:
1312 if (!(flags & O_CREAT))
1313 return -ENOENT;
1314
1315 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1316 }
1317
1318 /*
1319 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1320 * @this: move this
1321 * @to: to here
1322 *
1323 * Follow @to back to the root and make sure we don't encounter @this
1324 * Assumes we already hold the rename lock.
1325 *
1326 * Returns: errno
1327 */
1328
1329 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1330 {
1331 struct inode *dir = &to->i_inode;
1332 struct super_block *sb = dir->i_sb;
1333 struct inode *tmp;
1334 int error = 0;
1335
1336 igrab(dir);
1337
1338 for (;;) {
1339 if (dir == &this->i_inode) {
1340 error = -EINVAL;
1341 break;
1342 }
1343 if (dir == d_inode(sb->s_root)) {
1344 error = 0;
1345 break;
1346 }
1347
1348 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1349 if (!tmp) {
1350 error = -ENOENT;
1351 break;
1352 }
1353 if (IS_ERR(tmp)) {
1354 error = PTR_ERR(tmp);
1355 break;
1356 }
1357
1358 iput(dir);
1359 dir = tmp;
1360 }
1361
1362 iput(dir);
1363
1364 return error;
1365 }
1366
1367 /**
1368 * update_moved_ino - Update an inode that's being moved
1369 * @ip: The inode being moved
1370 * @ndip: The parent directory of the new filename
1371 * @dir_rename: True of ip is a directory
1372 *
1373 * Returns: errno
1374 */
1375
1376 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1377 int dir_rename)
1378 {
1379 if (dir_rename)
1380 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1381
1382 inode_set_ctime_current(&ip->i_inode);
1383 mark_inode_dirty_sync(&ip->i_inode);
1384 return 0;
1385 }
1386
1387
1388 /**
1389 * gfs2_rename - Rename a file
1390 * @odir: Parent directory of old file name
1391 * @odentry: The old dentry of the file
1392 * @ndir: Parent directory of new file name
1393 * @ndentry: The new dentry of the file
1394 *
1395 * Returns: errno
1396 */
1397
1398 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1399 struct inode *ndir, struct dentry *ndentry)
1400 {
1401 struct gfs2_inode *odip = GFS2_I(odir);
1402 struct gfs2_inode *ndip = GFS2_I(ndir);
1403 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1404 struct gfs2_inode *nip = NULL;
1405 struct gfs2_sbd *sdp = GFS2_SB(odir);
1406 struct gfs2_holder ghs[4], r_gh, rd_gh;
1407 struct gfs2_rgrpd *nrgd;
1408 unsigned int num_gh;
1409 int dir_rename = 0;
1410 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1411 unsigned int x;
1412 int error;
1413
1414 gfs2_holder_mark_uninitialized(&r_gh);
1415 gfs2_holder_mark_uninitialized(&rd_gh);
1416 if (d_really_is_positive(ndentry)) {
1417 nip = GFS2_I(d_inode(ndentry));
1418 if (ip == nip)
1419 return 0;
1420 }
1421
1422 error = gfs2_rindex_update(sdp);
1423 if (error)
1424 return error;
1425
1426 error = gfs2_qa_get(ndip);
1427 if (error)
1428 return error;
1429
1430 if (odip != ndip) {
1431 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1432 0, &r_gh);
1433 if (error)
1434 goto out;
1435
1436 if (S_ISDIR(ip->i_inode.i_mode)) {
1437 dir_rename = 1;
1438 /* don't move a directory into its subdir */
1439 error = gfs2_ok_to_move(ip, ndip);
1440 if (error)
1441 goto out_gunlock_r;
1442 }
1443 }
1444
1445 num_gh = 1;
1446 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1447 if (odip != ndip) {
1448 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1449 ghs + num_gh);
1450 num_gh++;
1451 }
1452 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1453 num_gh++;
1454
1455 if (nip) {
1456 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1457 ghs + num_gh);
1458 num_gh++;
1459 }
1460
1461 for (x = 0; x < num_gh; x++) {
1462 error = gfs2_glock_nq(ghs + x);
1463 if (error)
1464 goto out_gunlock;
1465 }
1466 error = gfs2_glock_async_wait(num_gh, ghs);
1467 if (error)
1468 goto out_gunlock;
1469
1470 if (nip) {
1471 /* Grab the resource group glock for unlink flag twiddling.
1472 * This is the case where the target dinode already exists
1473 * so we unlink before doing the rename.
1474 */
1475 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1476 if (!nrgd) {
1477 error = -ENOENT;
1478 goto out_gunlock;
1479 }
1480 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1481 LM_FLAG_NODE_SCOPE, &rd_gh);
1482 if (error)
1483 goto out_gunlock;
1484 }
1485
1486 error = -ENOENT;
1487 if (ip->i_inode.i_nlink == 0)
1488 goto out_gunlock;
1489
1490 /* Check out the old directory */
1491
1492 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1493 if (error)
1494 goto out_gunlock;
1495
1496 /* Check out the new directory */
1497
1498 if (nip) {
1499 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1500 if (error)
1501 goto out_gunlock;
1502
1503 if (nip->i_inode.i_nlink == 0) {
1504 error = -EAGAIN;
1505 goto out_gunlock;
1506 }
1507
1508 if (S_ISDIR(nip->i_inode.i_mode)) {
1509 if (nip->i_entries < 2) {
1510 gfs2_consist_inode(nip);
1511 error = -EIO;
1512 goto out_gunlock;
1513 }
1514 if (nip->i_entries > 2) {
1515 error = -ENOTEMPTY;
1516 goto out_gunlock;
1517 }
1518 }
1519 } else {
1520 error = gfs2_permission(&nop_mnt_idmap, ndir,
1521 MAY_WRITE | MAY_EXEC);
1522 if (error)
1523 goto out_gunlock;
1524
1525 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1526 switch (error) {
1527 case -ENOENT:
1528 error = 0;
1529 break;
1530 case 0:
1531 error = -EEXIST;
1532 goto out_gunlock;
1533 default:
1534 goto out_gunlock;
1535 }
1536
1537 if (odip != ndip) {
1538 if (!ndip->i_inode.i_nlink) {
1539 error = -ENOENT;
1540 goto out_gunlock;
1541 }
1542 if (ndip->i_entries == (u32)-1) {
1543 error = -EFBIG;
1544 goto out_gunlock;
1545 }
1546 if (S_ISDIR(ip->i_inode.i_mode) &&
1547 ndip->i_inode.i_nlink == (u32)-1) {
1548 error = -EMLINK;
1549 goto out_gunlock;
1550 }
1551 }
1552 }
1553
1554 /* Check out the dir to be renamed */
1555
1556 if (dir_rename) {
1557 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1558 MAY_WRITE);
1559 if (error)
1560 goto out_gunlock;
1561 }
1562
1563 if (nip == NULL) {
1564 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1565 if (error)
1566 goto out_gunlock;
1567 }
1568
1569 if (da.nr_blocks) {
1570 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1571 error = gfs2_quota_lock_check(ndip, &ap);
1572 if (error)
1573 goto out_gunlock;
1574
1575 error = gfs2_inplace_reserve(ndip, &ap);
1576 if (error)
1577 goto out_gunlock_q;
1578
1579 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1580 4 * RES_LEAF + 4, 0);
1581 if (error)
1582 goto out_ipreserv;
1583 } else {
1584 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1585 5 * RES_LEAF + 4, 0);
1586 if (error)
1587 goto out_gunlock;
1588 }
1589
1590 /* Remove the target file, if it exists */
1591
1592 if (nip)
1593 error = gfs2_unlink_inode(ndip, ndentry);
1594
1595 error = update_moved_ino(ip, ndip, dir_rename);
1596 if (error)
1597 goto out_end_trans;
1598
1599 error = gfs2_dir_del(odip, odentry);
1600 if (error)
1601 goto out_end_trans;
1602
1603 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1604 if (error)
1605 goto out_end_trans;
1606
1607 out_end_trans:
1608 gfs2_trans_end(sdp);
1609 out_ipreserv:
1610 if (da.nr_blocks)
1611 gfs2_inplace_release(ndip);
1612 out_gunlock_q:
1613 if (da.nr_blocks)
1614 gfs2_quota_unlock(ndip);
1615 out_gunlock:
1616 gfs2_dir_no_add(&da);
1617 if (gfs2_holder_initialized(&rd_gh))
1618 gfs2_glock_dq_uninit(&rd_gh);
1619
1620 while (x--) {
1621 if (gfs2_holder_queued(ghs + x))
1622 gfs2_glock_dq(ghs + x);
1623 gfs2_holder_uninit(ghs + x);
1624 }
1625 out_gunlock_r:
1626 if (gfs2_holder_initialized(&r_gh))
1627 gfs2_glock_dq_uninit(&r_gh);
1628 out:
1629 gfs2_qa_put(ndip);
1630 return error;
1631 }
1632
1633 /**
1634 * gfs2_exchange - exchange two files
1635 * @odir: Parent directory of old file name
1636 * @odentry: The old dentry of the file
1637 * @ndir: Parent directory of new file name
1638 * @ndentry: The new dentry of the file
1639 * @flags: The rename flags
1640 *
1641 * Returns: errno
1642 */
1643
1644 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1645 struct inode *ndir, struct dentry *ndentry,
1646 unsigned int flags)
1647 {
1648 struct gfs2_inode *odip = GFS2_I(odir);
1649 struct gfs2_inode *ndip = GFS2_I(ndir);
1650 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1651 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1652 struct gfs2_sbd *sdp = GFS2_SB(odir);
1653 struct gfs2_holder ghs[4], r_gh;
1654 unsigned int num_gh;
1655 unsigned int x;
1656 umode_t old_mode = oip->i_inode.i_mode;
1657 umode_t new_mode = nip->i_inode.i_mode;
1658 int error;
1659
1660 gfs2_holder_mark_uninitialized(&r_gh);
1661 error = gfs2_rindex_update(sdp);
1662 if (error)
1663 return error;
1664
1665 if (odip != ndip) {
1666 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1667 0, &r_gh);
1668 if (error)
1669 goto out;
1670
1671 if (S_ISDIR(old_mode)) {
1672 /* don't move a directory into its subdir */
1673 error = gfs2_ok_to_move(oip, ndip);
1674 if (error)
1675 goto out_gunlock_r;
1676 }
1677
1678 if (S_ISDIR(new_mode)) {
1679 /* don't move a directory into its subdir */
1680 error = gfs2_ok_to_move(nip, odip);
1681 if (error)
1682 goto out_gunlock_r;
1683 }
1684 }
1685
1686 num_gh = 1;
1687 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1688 if (odip != ndip) {
1689 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1690 ghs + num_gh);
1691 num_gh++;
1692 }
1693 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1694 num_gh++;
1695
1696 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1697 num_gh++;
1698
1699 for (x = 0; x < num_gh; x++) {
1700 error = gfs2_glock_nq(ghs + x);
1701 if (error)
1702 goto out_gunlock;
1703 }
1704
1705 error = gfs2_glock_async_wait(num_gh, ghs);
1706 if (error)
1707 goto out_gunlock;
1708
1709 error = -ENOENT;
1710 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1711 goto out_gunlock;
1712
1713 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1714 if (error)
1715 goto out_gunlock;
1716 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1717 if (error)
1718 goto out_gunlock;
1719
1720 if (S_ISDIR(old_mode)) {
1721 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1722 MAY_WRITE);
1723 if (error)
1724 goto out_gunlock;
1725 }
1726 if (S_ISDIR(new_mode)) {
1727 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1728 MAY_WRITE);
1729 if (error)
1730 goto out_gunlock;
1731 }
1732 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1733 if (error)
1734 goto out_gunlock;
1735
1736 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1737 if (error)
1738 goto out_end_trans;
1739
1740 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1741 if (error)
1742 goto out_end_trans;
1743
1744 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1745 IF2DT(old_mode));
1746 if (error)
1747 goto out_end_trans;
1748
1749 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1750 IF2DT(new_mode));
1751 if (error)
1752 goto out_end_trans;
1753
1754 if (odip != ndip) {
1755 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1756 inc_nlink(&odip->i_inode);
1757 drop_nlink(&ndip->i_inode);
1758 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1759 inc_nlink(&ndip->i_inode);
1760 drop_nlink(&odip->i_inode);
1761 }
1762 }
1763 mark_inode_dirty(&ndip->i_inode);
1764 if (odip != ndip)
1765 mark_inode_dirty(&odip->i_inode);
1766
1767 out_end_trans:
1768 gfs2_trans_end(sdp);
1769 out_gunlock:
1770 while (x--) {
1771 if (gfs2_holder_queued(ghs + x))
1772 gfs2_glock_dq(ghs + x);
1773 gfs2_holder_uninit(ghs + x);
1774 }
1775 out_gunlock_r:
1776 if (gfs2_holder_initialized(&r_gh))
1777 gfs2_glock_dq_uninit(&r_gh);
1778 out:
1779 return error;
1780 }
1781
1782 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1783 struct dentry *odentry, struct inode *ndir,
1784 struct dentry *ndentry, unsigned int flags)
1785 {
1786 flags &= ~RENAME_NOREPLACE;
1787
1788 if (flags & ~RENAME_EXCHANGE)
1789 return -EINVAL;
1790
1791 if (flags & RENAME_EXCHANGE)
1792 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1793
1794 return gfs2_rename(odir, odentry, ndir, ndentry);
1795 }
1796
1797 /**
1798 * gfs2_get_link - Follow a symbolic link
1799 * @dentry: The dentry of the link
1800 * @inode: The inode of the link
1801 * @done: destructor for return value
1802 *
1803 * This can handle symlinks of any size.
1804 *
1805 * Returns: 0 on success or error code
1806 */
1807
1808 static const char *gfs2_get_link(struct dentry *dentry,
1809 struct inode *inode,
1810 struct delayed_call *done)
1811 {
1812 struct gfs2_inode *ip = GFS2_I(inode);
1813 struct gfs2_holder i_gh;
1814 struct buffer_head *dibh;
1815 unsigned int size;
1816 char *buf;
1817 int error;
1818
1819 if (!dentry)
1820 return ERR_PTR(-ECHILD);
1821
1822 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1823 error = gfs2_glock_nq(&i_gh);
1824 if (error) {
1825 gfs2_holder_uninit(&i_gh);
1826 return ERR_PTR(error);
1827 }
1828
1829 size = (unsigned int)i_size_read(&ip->i_inode);
1830 if (size == 0) {
1831 gfs2_consist_inode(ip);
1832 buf = ERR_PTR(-EIO);
1833 goto out;
1834 }
1835
1836 error = gfs2_meta_inode_buffer(ip, &dibh);
1837 if (error) {
1838 buf = ERR_PTR(error);
1839 goto out;
1840 }
1841
1842 buf = kzalloc(size + 1, GFP_NOFS);
1843 if (!buf)
1844 buf = ERR_PTR(-ENOMEM);
1845 else
1846 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1847 brelse(dibh);
1848 out:
1849 gfs2_glock_dq_uninit(&i_gh);
1850 if (!IS_ERR(buf))
1851 set_delayed_call(done, kfree_link, buf);
1852 return buf;
1853 }
1854
1855 /**
1856 * gfs2_permission
1857 * @idmap: idmap of the mount the inode was found from
1858 * @inode: The inode
1859 * @mask: The mask to be tested
1860 *
1861 * This may be called from the VFS directly, or from within GFS2 with the
1862 * inode locked, so we look to see if the glock is already locked and only
1863 * lock the glock if its not already been done.
1864 *
1865 * Returns: errno
1866 */
1867
1868 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1869 int mask)
1870 {
1871 int may_not_block = mask & MAY_NOT_BLOCK;
1872 struct gfs2_inode *ip;
1873 struct gfs2_holder i_gh;
1874 struct gfs2_glock *gl;
1875 int error;
1876
1877 gfs2_holder_mark_uninitialized(&i_gh);
1878 ip = GFS2_I(inode);
1879 gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1880 if (unlikely(!gl)) {
1881 /* inode is getting torn down, must be RCU mode */
1882 WARN_ON_ONCE(!may_not_block);
1883 return -ECHILD;
1884 }
1885 if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1886 if (may_not_block)
1887 return -ECHILD;
1888 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1889 if (error)
1890 return error;
1891 }
1892
1893 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1894 error = -EPERM;
1895 else
1896 error = generic_permission(&nop_mnt_idmap, inode, mask);
1897 if (gfs2_holder_initialized(&i_gh))
1898 gfs2_glock_dq_uninit(&i_gh);
1899
1900 return error;
1901 }
1902
1903 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1904 {
1905 setattr_copy(&nop_mnt_idmap, inode, attr);
1906 mark_inode_dirty(inode);
1907 return 0;
1908 }
1909
1910 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1911 {
1912 int error;
1913
1914 if (current->journal_info)
1915 return __gfs2_setattr_simple(inode, attr);
1916
1917 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1918 if (error)
1919 return error;
1920
1921 error = __gfs2_setattr_simple(inode, attr);
1922 gfs2_trans_end(GFS2_SB(inode));
1923 return error;
1924 }
1925
1926 static int setattr_chown(struct inode *inode, struct iattr *attr)
1927 {
1928 struct gfs2_inode *ip = GFS2_I(inode);
1929 struct gfs2_sbd *sdp = GFS2_SB(inode);
1930 kuid_t ouid, nuid;
1931 kgid_t ogid, ngid;
1932 int error;
1933 struct gfs2_alloc_parms ap = {};
1934
1935 ouid = inode->i_uid;
1936 ogid = inode->i_gid;
1937 nuid = attr->ia_uid;
1938 ngid = attr->ia_gid;
1939
1940 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1941 ouid = nuid = NO_UID_QUOTA_CHANGE;
1942 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1943 ogid = ngid = NO_GID_QUOTA_CHANGE;
1944 error = gfs2_qa_get(ip);
1945 if (error)
1946 return error;
1947
1948 error = gfs2_rindex_update(sdp);
1949 if (error)
1950 goto out;
1951
1952 error = gfs2_quota_lock(ip, nuid, ngid);
1953 if (error)
1954 goto out;
1955
1956 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1957
1958 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1959 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1960 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1961 if (error)
1962 goto out_gunlock_q;
1963 }
1964
1965 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1966 if (error)
1967 goto out_gunlock_q;
1968
1969 error = gfs2_setattr_simple(inode, attr);
1970 if (error)
1971 goto out_end_trans;
1972
1973 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1974 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1975 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1976 gfs2_quota_change(ip, ap.target, nuid, ngid);
1977 }
1978
1979 out_end_trans:
1980 gfs2_trans_end(sdp);
1981 out_gunlock_q:
1982 gfs2_quota_unlock(ip);
1983 out:
1984 gfs2_qa_put(ip);
1985 return error;
1986 }
1987
1988 /**
1989 * gfs2_setattr - Change attributes on an inode
1990 * @idmap: idmap of the mount the inode was found from
1991 * @dentry: The dentry which is changing
1992 * @attr: The structure describing the change
1993 *
1994 * The VFS layer wants to change one or more of an inodes attributes. Write
1995 * that change out to disk.
1996 *
1997 * Returns: errno
1998 */
1999
2000 static int gfs2_setattr(struct mnt_idmap *idmap,
2001 struct dentry *dentry, struct iattr *attr)
2002 {
2003 struct inode *inode = d_inode(dentry);
2004 struct gfs2_inode *ip = GFS2_I(inode);
2005 struct gfs2_holder i_gh;
2006 int error;
2007
2008 error = gfs2_qa_get(ip);
2009 if (error)
2010 return error;
2011
2012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2013 if (error)
2014 goto out;
2015
2016 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2017 if (error)
2018 goto error;
2019
2020 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2021 if (error)
2022 goto error;
2023
2024 if (attr->ia_valid & ATTR_SIZE)
2025 error = gfs2_setattr_size(inode, attr->ia_size);
2026 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2027 error = setattr_chown(inode, attr);
2028 else {
2029 error = gfs2_setattr_simple(inode, attr);
2030 if (!error && attr->ia_valid & ATTR_MODE)
2031 error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2032 inode->i_mode);
2033 }
2034
2035 error:
2036 if (!error)
2037 mark_inode_dirty(inode);
2038 gfs2_glock_dq_uninit(&i_gh);
2039 out:
2040 gfs2_qa_put(ip);
2041 return error;
2042 }
2043
2044 /**
2045 * gfs2_getattr - Read out an inode's attributes
2046 * @idmap: idmap of the mount the inode was found from
2047 * @path: Object to query
2048 * @stat: The inode's stats
2049 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2050 * @flags: AT_STATX_xxx setting
2051 *
2052 * This may be called from the VFS directly, or from within GFS2 with the
2053 * inode locked, so we look to see if the glock is already locked and only
2054 * lock the glock if its not already been done. Note that its the NFS
2055 * readdirplus operation which causes this to be called (from filldir)
2056 * with the glock already held.
2057 *
2058 * Returns: errno
2059 */
2060
2061 static int gfs2_getattr(struct mnt_idmap *idmap,
2062 const struct path *path, struct kstat *stat,
2063 u32 request_mask, unsigned int flags)
2064 {
2065 struct inode *inode = d_inode(path->dentry);
2066 struct gfs2_inode *ip = GFS2_I(inode);
2067 struct gfs2_holder gh;
2068 u32 gfsflags;
2069 int error;
2070
2071 gfs2_holder_mark_uninitialized(&gh);
2072 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2073 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2074 if (error)
2075 return error;
2076 }
2077
2078 gfsflags = ip->i_diskflags;
2079 if (gfsflags & GFS2_DIF_APPENDONLY)
2080 stat->attributes |= STATX_ATTR_APPEND;
2081 if (gfsflags & GFS2_DIF_IMMUTABLE)
2082 stat->attributes |= STATX_ATTR_IMMUTABLE;
2083
2084 stat->attributes_mask |= (STATX_ATTR_APPEND |
2085 STATX_ATTR_COMPRESSED |
2086 STATX_ATTR_ENCRYPTED |
2087 STATX_ATTR_IMMUTABLE |
2088 STATX_ATTR_NODUMP);
2089
2090 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2091
2092 if (gfs2_holder_initialized(&gh))
2093 gfs2_glock_dq_uninit(&gh);
2094
2095 return 0;
2096 }
2097
2098 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2099 u64 start, u64 len)
2100 {
2101 struct gfs2_inode *ip = GFS2_I(inode);
2102 struct gfs2_holder gh;
2103 int ret;
2104
2105 inode_lock_shared(inode);
2106
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2108 if (ret)
2109 goto out;
2110
2111 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2112
2113 gfs2_glock_dq_uninit(&gh);
2114
2115 out:
2116 inode_unlock_shared(inode);
2117 return ret;
2118 }
2119
2120 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2121 {
2122 struct inode *inode = file->f_mapping->host;
2123 struct gfs2_inode *ip = GFS2_I(inode);
2124 struct gfs2_holder gh;
2125 loff_t ret;
2126
2127 inode_lock_shared(inode);
2128 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2129 if (!ret)
2130 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2131 gfs2_glock_dq_uninit(&gh);
2132 inode_unlock_shared(inode);
2133
2134 if (ret < 0)
2135 return ret;
2136 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2137 }
2138
2139 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2140 {
2141 struct inode *inode = file->f_mapping->host;
2142 struct gfs2_inode *ip = GFS2_I(inode);
2143 struct gfs2_holder gh;
2144 loff_t ret;
2145
2146 inode_lock_shared(inode);
2147 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2148 if (!ret)
2149 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2150 gfs2_glock_dq_uninit(&gh);
2151 inode_unlock_shared(inode);
2152
2153 if (ret < 0)
2154 return ret;
2155 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2156 }
2157
2158 static int gfs2_update_time(struct inode *inode, int flags)
2159 {
2160 struct gfs2_inode *ip = GFS2_I(inode);
2161 struct gfs2_glock *gl = ip->i_gl;
2162 struct gfs2_holder *gh;
2163 int error;
2164
2165 gh = gfs2_glock_is_locked_by_me(gl);
2166 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2167 gfs2_glock_dq(gh);
2168 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2169 error = gfs2_glock_nq(gh);
2170 if (error)
2171 return error;
2172 }
2173 generic_update_time(inode, flags);
2174 return 0;
2175 }
2176
2177 static const struct inode_operations gfs2_file_iops = {
2178 .permission = gfs2_permission,
2179 .setattr = gfs2_setattr,
2180 .getattr = gfs2_getattr,
2181 .listxattr = gfs2_listxattr,
2182 .fiemap = gfs2_fiemap,
2183 .get_inode_acl = gfs2_get_acl,
2184 .set_acl = gfs2_set_acl,
2185 .update_time = gfs2_update_time,
2186 .fileattr_get = gfs2_fileattr_get,
2187 .fileattr_set = gfs2_fileattr_set,
2188 };
2189
2190 static const struct inode_operations gfs2_dir_iops = {
2191 .create = gfs2_create,
2192 .lookup = gfs2_lookup,
2193 .link = gfs2_link,
2194 .unlink = gfs2_unlink,
2195 .symlink = gfs2_symlink,
2196 .mkdir = gfs2_mkdir,
2197 .rmdir = gfs2_unlink,
2198 .mknod = gfs2_mknod,
2199 .rename = gfs2_rename2,
2200 .permission = gfs2_permission,
2201 .setattr = gfs2_setattr,
2202 .getattr = gfs2_getattr,
2203 .listxattr = gfs2_listxattr,
2204 .fiemap = gfs2_fiemap,
2205 .get_inode_acl = gfs2_get_acl,
2206 .set_acl = gfs2_set_acl,
2207 .update_time = gfs2_update_time,
2208 .atomic_open = gfs2_atomic_open,
2209 .fileattr_get = gfs2_fileattr_get,
2210 .fileattr_set = gfs2_fileattr_set,
2211 };
2212
2213 static const struct inode_operations gfs2_symlink_iops = {
2214 .get_link = gfs2_get_link,
2215 .permission = gfs2_permission,
2216 .setattr = gfs2_setattr,
2217 .getattr = gfs2_getattr,
2218 .listxattr = gfs2_listxattr,
2219 .fiemap = gfs2_fiemap,
2220 };
2221
Kernel DRM miscellaneous fixes and cross-tree changes