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drm/i915: Make intel_lr_context_render_state_init() static
[linux-2.6/btrfs-unstable.git] / fs / gfs2 / inode.c
blob9054002ebe70dceb3b1483be3fbd54ea15f2e06a
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
15 #include <linux/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/security.h>
22 #include <asm/uaccess.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "acl.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "xattr.h"
30 #include "glock.h"
31 #include "inode.h"
32 #include "meta_io.h"
33 #include "quota.h"
34 #include "rgrp.h"
35 #include "trans.h"
36 #include "util.h"
37 #include "super.h"
38 #include "glops.h"
39
40 struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44 };
45
46 static int iget_test(struct inode *inode, void *opaque)
47 {
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60 }
61
62 static int iget_set(struct inode *inode, void *opaque)
63 {
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72 }
73
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75 {
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83 }
84
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87 {
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95 }
96
97 /**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105 static void gfs2_set_iop(struct inode *inode)
106 {
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128 }
129
130 /**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142 {
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOMEM);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191 fail_refresh:
192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195 fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198 fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201 fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204 }
205
206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208 {
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241 fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244 fail_iput:
245 iput(inode);
246 goto fail;
247 }
248
249
250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251 {
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265 }
266
267
268 /**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285 {
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == sb->s_root->d_inode)) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name, false);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319 out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325 }
326
327 /**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338 {
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355 }
356
357 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
359 {
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
368 } else
369 inode->i_uid = current_fsuid();
370
371 if (dip->i_inode.i_mode & S_ISGID) {
372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
375 } else
376 inode->i_gid = current_fsgid();
377 }
378
379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
380 {
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 int error;
384
385 error = gfs2_quota_lock_check(ip);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, &ap);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404 out_ipreserv:
405 gfs2_inplace_release(ip);
406 out_quota:
407 gfs2_quota_unlock(ip);
408 out:
409 return error;
410 }
411
412 static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414 {
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427 }
428
429 /**
430 * gfs2_init_xattr - Initialise an xattr block for a new inode
431 * @ip: The inode in question
432 *
433 * This sets up an empty xattr block for a new inode, ready to
434 * take any ACLs, LSM xattrs, etc.
435 */
436
437 static void gfs2_init_xattr(struct gfs2_inode *ip)
438 {
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454 }
455
456 /**
457 * init_dinode - Fill in a new dinode structure
458 * @dip: The directory this inode is being created in
459 * @ip: The inode
460 * @symname: The symlink destination (if a symlink)
461 * @bhp: The buffer head (returned to caller)
462 *
463 */
464
465 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466 const char *symname)
467 {
468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
470
471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472 gfs2_trans_add_meta(ip->i_gl, dibh);
473 di = (struct gfs2_dinode *)dibh->b_data;
474 gfs2_dinode_out(ip, di);
475
476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 di->__pad1 = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484
485 switch(ip->i_inode.i_mode & S_IFMT) {
486 case S_IFDIR:
487 gfs2_init_dir(dibh, dip);
488 break;
489 case S_IFLNK:
490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 break;
492 }
493
494 set_buffer_uptodate(dibh);
495 brelse(dibh);
496 }
497
498 /**
499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500 * @dip: The directory we are linking into
501 * @da: The dir add information
502 * @nr_inodes: The number of inodes involved
503 *
504 * This calculate the number of blocks we need to reserve in a
505 * transaction to link @nr_inodes into a directory. In most cases
506 * @nr_inodes will be 2 (the directory plus the inode being linked in)
507 * but in case of rename, 4 may be required.
508 *
509 * Returns: Number of blocks
510 */
511
512 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515 {
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518 }
519
520 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521 struct gfs2_inode *ip, struct gfs2_diradd *da)
522 {
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 int error;
526
527 if (da->nr_blocks) {
528 error = gfs2_quota_lock_check(dip);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_inplace_reserve(dip, &ap);
533 if (error)
534 goto fail_quota_locks;
535
536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 if (error)
547 goto fail_end_trans;
548
549 fail_end_trans:
550 gfs2_trans_end(sdp);
551 fail_ipreserv:
552 gfs2_inplace_release(dip);
553 fail_quota_locks:
554 gfs2_quota_unlock(dip);
555 return error;
556 }
557
558 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
559 void *fs_info)
560 {
561 const struct xattr *xattr;
562 int err = 0;
563
564 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
566 xattr->value_len, 0,
567 GFS2_EATYPE_SECURITY);
568 if (err < 0)
569 break;
570 }
571 return err;
572 }
573
574 /**
575 * gfs2_create_inode - Create a new inode
576 * @dir: The parent directory
577 * @dentry: The new dentry
578 * @file: If non-NULL, the file which is being opened
579 * @mode: The permissions on the new inode
580 * @dev: For device nodes, this is the device number
581 * @symname: For symlinks, this is the link destination
582 * @size: The initial size of the inode (ignored for directories)
583 *
584 * Returns: 0 on success, or error code
585 */
586
587 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
588 struct file *file,
589 umode_t mode, dev_t dev, const char *symname,
590 unsigned int size, int excl, int *opened)
591 {
592 const struct qstr *name = &dentry->d_name;
593 struct posix_acl *default_acl, *acl;
594 struct gfs2_holder ghs[2];
595 struct inode *inode = NULL;
596 struct gfs2_inode *dip = GFS2_I(dir), *ip;
597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
598 struct gfs2_glock *io_gl;
599 int error, free_vfs_inode = 0;
600 u32 aflags = 0;
601 unsigned blocks = 1;
602 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
603
604 if (!name->len || name->len > GFS2_FNAMESIZE)
605 return -ENAMETOOLONG;
606
607 error = gfs2_rs_alloc(dip);
608 if (error)
609 return error;
610
611 error = gfs2_rindex_update(sdp);
612 if (error)
613 return error;
614
615 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
616 if (error)
617 goto fail;
618
619 error = create_ok(dip, name, mode);
620 if (error)
621 goto fail_gunlock;
622
623 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
624 error = PTR_ERR(inode);
625 if (!IS_ERR(inode)) {
626 if (S_ISDIR(inode->i_mode)) {
627 iput(inode);
628 inode = ERR_PTR(-EISDIR);
629 goto fail_gunlock;
630 }
631 d_instantiate(dentry, inode);
632 error = 0;
633 if (file) {
634 if (S_ISREG(inode->i_mode))
635 error = finish_open(file, dentry, gfs2_open_common, opened);
636 else
637 error = finish_no_open(file, NULL);
638 }
639 gfs2_glock_dq_uninit(ghs);
640 return error;
641 } else if (error != -ENOENT) {
642 goto fail_gunlock;
643 }
644
645 error = gfs2_diradd_alloc_required(dir, name, &da);
646 if (error < 0)
647 goto fail_gunlock;
648
649 inode = new_inode(sdp->sd_vfs);
650 error = -ENOMEM;
651 if (!inode)
652 goto fail_gunlock;
653
654 error = posix_acl_create(dir, &mode, &default_acl, &acl);
655 if (error)
656 goto fail_free_vfs_inode;
657
658 ip = GFS2_I(inode);
659 error = gfs2_rs_alloc(ip);
660 if (error)
661 goto fail_free_acls;
662
663 inode->i_mode = mode;
664 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
665 inode->i_rdev = dev;
666 inode->i_size = size;
667 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
668 gfs2_set_inode_blocks(inode, 1);
669 munge_mode_uid_gid(dip, inode);
670 check_and_update_goal(dip);
671 ip->i_goal = dip->i_goal;
672 ip->i_diskflags = 0;
673 ip->i_eattr = 0;
674 ip->i_height = 0;
675 ip->i_depth = 0;
676 ip->i_entries = 0;
677
678 switch(mode & S_IFMT) {
679 case S_IFREG:
680 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
681 gfs2_tune_get(sdp, gt_new_files_jdata))
682 ip->i_diskflags |= GFS2_DIF_JDATA;
683 gfs2_set_aops(inode);
684 break;
685 case S_IFDIR:
686 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
687 ip->i_diskflags |= GFS2_DIF_JDATA;
688 ip->i_entries = 2;
689 break;
690 }
691 gfs2_set_inode_flags(inode);
692
693 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
694 (dip->i_diskflags & GFS2_DIF_TOPDIR))
695 aflags |= GFS2_AF_ORLOV;
696
697 if (default_acl || acl)
698 blocks++;
699
700 error = alloc_dinode(ip, aflags, &blocks);
701 if (error)
702 goto fail_free_inode;
703
704 gfs2_set_inode_blocks(inode, blocks);
705
706 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
707 if (error)
708 goto fail_free_inode;
709
710 ip->i_gl->gl_object = ip;
711 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
712 if (error)
713 goto fail_free_inode;
714
715 error = gfs2_trans_begin(sdp, blocks, 0);
716 if (error)
717 goto fail_gunlock2;
718
719 if (blocks > 1) {
720 ip->i_eattr = ip->i_no_addr + 1;
721 gfs2_init_xattr(ip);
722 }
723 init_dinode(dip, ip, symname);
724 gfs2_trans_end(sdp);
725
726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
727 if (error)
728 goto fail_gunlock2;
729
730 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
731 if (error)
732 goto fail_gunlock2;
733
734 ip->i_iopen_gh.gh_gl->gl_object = ip;
735 gfs2_glock_put(io_gl);
736 gfs2_set_iop(inode);
737 insert_inode_hash(inode);
738
739 if (default_acl) {
740 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
741 posix_acl_release(default_acl);
742 }
743 if (acl) {
744 if (!error)
745 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
746 posix_acl_release(acl);
747 }
748
749 if (error)
750 goto fail_gunlock3;
751
752 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
753 &gfs2_initxattrs, NULL);
754 if (error)
755 goto fail_gunlock3;
756
757 error = link_dinode(dip, name, ip, &da);
758 if (error)
759 goto fail_gunlock3;
760
761 mark_inode_dirty(inode);
762 d_instantiate(dentry, inode);
763 if (file) {
764 *opened |= FILE_CREATED;
765 error = finish_open(file, dentry, gfs2_open_common, opened);
766 }
767 gfs2_glock_dq_uninit(ghs);
768 gfs2_glock_dq_uninit(ghs + 1);
769 return error;
770
771 fail_gunlock3:
772 gfs2_glock_dq_uninit(ghs + 1);
773 if (ip->i_gl)
774 gfs2_glock_put(ip->i_gl);
775 goto fail_gunlock;
776
777 fail_gunlock2:
778 gfs2_glock_dq_uninit(ghs + 1);
779 fail_free_inode:
780 if (ip->i_gl)
781 gfs2_glock_put(ip->i_gl);
782 gfs2_rs_delete(ip, NULL);
783 fail_free_acls:
784 if (default_acl)
785 posix_acl_release(default_acl);
786 if (acl)
787 posix_acl_release(acl);
788 fail_free_vfs_inode:
789 free_vfs_inode = 1;
790 fail_gunlock:
791 gfs2_dir_no_add(&da);
792 gfs2_glock_dq_uninit(ghs);
793 if (inode && !IS_ERR(inode)) {
794 clear_nlink(inode);
795 if (!free_vfs_inode)
796 mark_inode_dirty(inode);
797 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
798 &GFS2_I(inode)->i_flags);
799 iput(inode);
800 }
801 fail:
802 return error;
803 }
804
805 /**
806 * gfs2_create - Create a file
807 * @dir: The directory in which to create the file
808 * @dentry: The dentry of the new file
809 * @mode: The mode of the new file
810 *
811 * Returns: errno
812 */
813
814 static int gfs2_create(struct inode *dir, struct dentry *dentry,
815 umode_t mode, bool excl)
816 {
817 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
818 }
819
820 /**
821 * __gfs2_lookup - Look up a filename in a directory and return its inode
822 * @dir: The directory inode
823 * @dentry: The dentry of the new inode
824 * @file: File to be opened
825 * @opened: atomic_open flags
826 *
827 *
828 * Returns: errno
829 */
830
831 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
832 struct file *file, int *opened)
833 {
834 struct inode *inode;
835 struct dentry *d;
836 struct gfs2_holder gh;
837 struct gfs2_glock *gl;
838 int error;
839
840 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
841 if (inode == NULL) {
842 d_add(dentry, NULL);
843 return NULL;
844 }
845 if (IS_ERR(inode))
846 return ERR_CAST(inode);
847
848 gl = GFS2_I(inode)->i_gl;
849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
850 if (error) {
851 iput(inode);
852 return ERR_PTR(error);
853 }
854
855 d = d_splice_alias(inode, dentry);
856 if (IS_ERR(d)) {
857 gfs2_glock_dq_uninit(&gh);
858 return d;
859 }
860 if (file && S_ISREG(inode->i_mode))
861 error = finish_open(file, dentry, gfs2_open_common, opened);
862
863 gfs2_glock_dq_uninit(&gh);
864 if (error) {
865 dput(d);
866 return ERR_PTR(error);
867 }
868 return d;
869 }
870
871 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
872 unsigned flags)
873 {
874 return __gfs2_lookup(dir, dentry, NULL, NULL);
875 }
876
877 /**
878 * gfs2_link - Link to a file
879 * @old_dentry: The inode to link
880 * @dir: Add link to this directory
881 * @dentry: The name of the link
882 *
883 * Link the inode in "old_dentry" into the directory "dir" with the
884 * name in "dentry".
885 *
886 * Returns: errno
887 */
888
889 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
890 struct dentry *dentry)
891 {
892 struct gfs2_inode *dip = GFS2_I(dir);
893 struct gfs2_sbd *sdp = GFS2_SB(dir);
894 struct inode *inode = old_dentry->d_inode;
895 struct gfs2_inode *ip = GFS2_I(inode);
896 struct gfs2_holder ghs[2];
897 struct buffer_head *dibh;
898 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
899 int error;
900
901 if (S_ISDIR(inode->i_mode))
902 return -EPERM;
903
904 error = gfs2_rs_alloc(dip);
905 if (error)
906 return error;
907
908 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
909 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
910
911 error = gfs2_glock_nq(ghs); /* parent */
912 if (error)
913 goto out_parent;
914
915 error = gfs2_glock_nq(ghs + 1); /* child */
916 if (error)
917 goto out_child;
918
919 error = -ENOENT;
920 if (inode->i_nlink == 0)
921 goto out_gunlock;
922
923 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
924 if (error)
925 goto out_gunlock;
926
927 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
928 switch (error) {
929 case -ENOENT:
930 break;
931 case 0:
932 error = -EEXIST;
933 default:
934 goto out_gunlock;
935 }
936
937 error = -EINVAL;
938 if (!dip->i_inode.i_nlink)
939 goto out_gunlock;
940 error = -EFBIG;
941 if (dip->i_entries == (u32)-1)
942 goto out_gunlock;
943 error = -EPERM;
944 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
945 goto out_gunlock;
946 error = -EINVAL;
947 if (!ip->i_inode.i_nlink)
948 goto out_gunlock;
949 error = -EMLINK;
950 if (ip->i_inode.i_nlink == (u32)-1)
951 goto out_gunlock;
952
953 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
954 if (error < 0)
955 goto out_gunlock;
956
957 if (da.nr_blocks) {
958 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
959 error = gfs2_quota_lock_check(dip);
960 if (error)
961 goto out_gunlock;
962
963 error = gfs2_inplace_reserve(dip, &ap);
964 if (error)
965 goto out_gunlock_q;
966
967 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
968 if (error)
969 goto out_ipres;
970 } else {
971 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
972 if (error)
973 goto out_ipres;
974 }
975
976 error = gfs2_meta_inode_buffer(ip, &dibh);
977 if (error)
978 goto out_end_trans;
979
980 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
981 if (error)
982 goto out_brelse;
983
984 gfs2_trans_add_meta(ip->i_gl, dibh);
985 inc_nlink(&ip->i_inode);
986 ip->i_inode.i_ctime = CURRENT_TIME;
987 ihold(inode);
988 d_instantiate(dentry, inode);
989 mark_inode_dirty(inode);
990
991 out_brelse:
992 brelse(dibh);
993 out_end_trans:
994 gfs2_trans_end(sdp);
995 out_ipres:
996 if (da.nr_blocks)
997 gfs2_inplace_release(dip);
998 out_gunlock_q:
999 if (da.nr_blocks)
1000 gfs2_quota_unlock(dip);
1001 out_gunlock:
1002 gfs2_dir_no_add(&da);
1003 gfs2_glock_dq(ghs + 1);
1004 out_child:
1005 gfs2_glock_dq(ghs);
1006 out_parent:
1007 gfs2_holder_uninit(ghs);
1008 gfs2_holder_uninit(ghs + 1);
1009 return error;
1010 }
1011
1012 /*
1013 * gfs2_unlink_ok - check to see that a inode is still in a directory
1014 * @dip: the directory
1015 * @name: the name of the file
1016 * @ip: the inode
1017 *
1018 * Assumes that the lock on (at least) @dip is held.
1019 *
1020 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1021 */
1022
1023 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1024 const struct gfs2_inode *ip)
1025 {
1026 int error;
1027
1028 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1029 return -EPERM;
1030
1031 if ((dip->i_inode.i_mode & S_ISVTX) &&
1032 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1033 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1034 return -EPERM;
1035
1036 if (IS_APPEND(&dip->i_inode))
1037 return -EPERM;
1038
1039 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1040 if (error)
1041 return error;
1042
1043 return gfs2_dir_check(&dip->i_inode, name, ip);
1044 }
1045
1046 /**
1047 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1048 * @dip: The parent directory
1049 * @name: The name of the entry in the parent directory
1050 * @inode: The inode to be removed
1051 *
1052 * Called with all the locks and in a transaction. This will only be
1053 * called for a directory after it has been checked to ensure it is empty.
1054 *
1055 * Returns: 0 on success, or an error
1056 */
1057
1058 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1059 const struct dentry *dentry)
1060 {
1061 struct inode *inode = dentry->d_inode;
1062 struct gfs2_inode *ip = GFS2_I(inode);
1063 int error;
1064
1065 error = gfs2_dir_del(dip, dentry);
1066 if (error)
1067 return error;
1068
1069 ip->i_entries = 0;
1070 inode->i_ctime = CURRENT_TIME;
1071 if (S_ISDIR(inode->i_mode))
1072 clear_nlink(inode);
1073 else
1074 drop_nlink(inode);
1075 mark_inode_dirty(inode);
1076 if (inode->i_nlink == 0)
1077 gfs2_unlink_di(inode);
1078 return 0;
1079 }
1080
1081
1082 /**
1083 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1084 * @dir: The inode of the directory containing the inode to unlink
1085 * @dentry: The file itself
1086 *
1087 * This routine uses the type of the inode as a flag to figure out
1088 * whether this is an unlink or an rmdir.
1089 *
1090 * Returns: errno
1091 */
1092
1093 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1094 {
1095 struct gfs2_inode *dip = GFS2_I(dir);
1096 struct gfs2_sbd *sdp = GFS2_SB(dir);
1097 struct inode *inode = dentry->d_inode;
1098 struct gfs2_inode *ip = GFS2_I(inode);
1099 struct gfs2_holder ghs[3];
1100 struct gfs2_rgrpd *rgd;
1101 int error;
1102
1103 error = gfs2_rindex_update(sdp);
1104 if (error)
1105 return error;
1106
1107 error = -EROFS;
1108
1109 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1110 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1111
1112 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1113 if (!rgd)
1114 goto out_inodes;
1115
1116 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1117
1118
1119 error = gfs2_glock_nq(ghs); /* parent */
1120 if (error)
1121 goto out_parent;
1122
1123 error = gfs2_glock_nq(ghs + 1); /* child */
1124 if (error)
1125 goto out_child;
1126
1127 error = -ENOENT;
1128 if (inode->i_nlink == 0)
1129 goto out_rgrp;
1130
1131 if (S_ISDIR(inode->i_mode)) {
1132 error = -ENOTEMPTY;
1133 if (ip->i_entries > 2 || inode->i_nlink > 2)
1134 goto out_rgrp;
1135 }
1136
1137 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1138 if (error)
1139 goto out_rgrp;
1140
1141 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1142 if (error)
1143 goto out_gunlock;
1144
1145 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1146 if (error)
1147 goto out_end_trans;
1148
1149 error = gfs2_unlink_inode(dip, dentry);
1150
1151 out_end_trans:
1152 gfs2_trans_end(sdp);
1153 out_gunlock:
1154 gfs2_glock_dq(ghs + 2);
1155 out_rgrp:
1156 gfs2_glock_dq(ghs + 1);
1157 out_child:
1158 gfs2_glock_dq(ghs);
1159 out_parent:
1160 gfs2_holder_uninit(ghs + 2);
1161 out_inodes:
1162 gfs2_holder_uninit(ghs + 1);
1163 gfs2_holder_uninit(ghs);
1164 return error;
1165 }
1166
1167 /**
1168 * gfs2_symlink - Create a symlink
1169 * @dir: The directory to create the symlink in
1170 * @dentry: The dentry to put the symlink in
1171 * @symname: The thing which the link points to
1172 *
1173 * Returns: errno
1174 */
1175
1176 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1177 const char *symname)
1178 {
1179 struct gfs2_sbd *sdp = GFS2_SB(dir);
1180 unsigned int size;
1181
1182 size = strlen(symname);
1183 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1184 return -ENAMETOOLONG;
1185
1186 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1187 }
1188
1189 /**
1190 * gfs2_mkdir - Make a directory
1191 * @dir: The parent directory of the new one
1192 * @dentry: The dentry of the new directory
1193 * @mode: The mode of the new directory
1194 *
1195 * Returns: errno
1196 */
1197
1198 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1199 {
1200 struct gfs2_sbd *sdp = GFS2_SB(dir);
1201 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1202 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1203 }
1204
1205 /**
1206 * gfs2_mknod - Make a special file
1207 * @dir: The directory in which the special file will reside
1208 * @dentry: The dentry of the special file
1209 * @mode: The mode of the special file
1210 * @dev: The device specification of the special file
1211 *
1212 */
1213
1214 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1215 dev_t dev)
1216 {
1217 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1218 }
1219
1220 /**
1221 * gfs2_atomic_open - Atomically open a file
1222 * @dir: The directory
1223 * @dentry: The proposed new entry
1224 * @file: The proposed new struct file
1225 * @flags: open flags
1226 * @mode: File mode
1227 * @opened: Flag to say whether the file has been opened or not
1228 *
1229 * Returns: error code or 0 for success
1230 */
1231
1232 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1233 struct file *file, unsigned flags,
1234 umode_t mode, int *opened)
1235 {
1236 struct dentry *d;
1237 bool excl = !!(flags & O_EXCL);
1238
1239 if (!d_unhashed(dentry))
1240 goto skip_lookup;
1241
1242 d = __gfs2_lookup(dir, dentry, file, opened);
1243 if (IS_ERR(d))
1244 return PTR_ERR(d);
1245 if (d != NULL)
1246 dentry = d;
1247 if (dentry->d_inode) {
1248 if (!(*opened & FILE_OPENED))
1249 return finish_no_open(file, d);
1250 dput(d);
1251 return 0;
1252 }
1253
1254 BUG_ON(d != NULL);
1255
1256 skip_lookup:
1257 if (!(flags & O_CREAT))
1258 return -ENOENT;
1259
1260 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1261 }
1262
1263 /*
1264 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1265 * @this: move this
1266 * @to: to here
1267 *
1268 * Follow @to back to the root and make sure we don't encounter @this
1269 * Assumes we already hold the rename lock.
1270 *
1271 * Returns: errno
1272 */
1273
1274 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1275 {
1276 struct inode *dir = &to->i_inode;
1277 struct super_block *sb = dir->i_sb;
1278 struct inode *tmp;
1279 int error = 0;
1280
1281 igrab(dir);
1282
1283 for (;;) {
1284 if (dir == &this->i_inode) {
1285 error = -EINVAL;
1286 break;
1287 }
1288 if (dir == sb->s_root->d_inode) {
1289 error = 0;
1290 break;
1291 }
1292
1293 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1294 if (!tmp) {
1295 error = -ENOENT;
1296 break;
1297 }
1298 if (IS_ERR(tmp)) {
1299 error = PTR_ERR(tmp);
1300 break;
1301 }
1302
1303 iput(dir);
1304 dir = tmp;
1305 }
1306
1307 iput(dir);
1308
1309 return error;
1310 }
1311
1312 /**
1313 * gfs2_rename - Rename a file
1314 * @odir: Parent directory of old file name
1315 * @odentry: The old dentry of the file
1316 * @ndir: Parent directory of new file name
1317 * @ndentry: The new dentry of the file
1318 *
1319 * Returns: errno
1320 */
1321
1322 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1323 struct inode *ndir, struct dentry *ndentry)
1324 {
1325 struct gfs2_inode *odip = GFS2_I(odir);
1326 struct gfs2_inode *ndip = GFS2_I(ndir);
1327 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1328 struct gfs2_inode *nip = NULL;
1329 struct gfs2_sbd *sdp = GFS2_SB(odir);
1330 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1331 struct gfs2_rgrpd *nrgd;
1332 unsigned int num_gh;
1333 int dir_rename = 0;
1334 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1335 unsigned int x;
1336 int error;
1337
1338 if (ndentry->d_inode) {
1339 nip = GFS2_I(ndentry->d_inode);
1340 if (ip == nip)
1341 return 0;
1342 }
1343
1344 error = gfs2_rindex_update(sdp);
1345 if (error)
1346 return error;
1347
1348 error = gfs2_rs_alloc(ndip);
1349 if (error)
1350 return error;
1351
1352 if (odip != ndip) {
1353 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1354 0, &r_gh);
1355 if (error)
1356 goto out;
1357
1358 if (S_ISDIR(ip->i_inode.i_mode)) {
1359 dir_rename = 1;
1360 /* don't move a dirctory into it's subdir */
1361 error = gfs2_ok_to_move(ip, ndip);
1362 if (error)
1363 goto out_gunlock_r;
1364 }
1365 }
1366
1367 num_gh = 1;
1368 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1369 if (odip != ndip) {
1370 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1371 num_gh++;
1372 }
1373 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1374 num_gh++;
1375
1376 if (nip) {
1377 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1378 num_gh++;
1379 /* grab the resource lock for unlink flag twiddling
1380 * this is the case of the target file already existing
1381 * so we unlink before doing the rename
1382 */
1383 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1384 if (nrgd)
1385 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1386 }
1387
1388 for (x = 0; x < num_gh; x++) {
1389 error = gfs2_glock_nq(ghs + x);
1390 if (error)
1391 goto out_gunlock;
1392 }
1393
1394 error = -ENOENT;
1395 if (ip->i_inode.i_nlink == 0)
1396 goto out_gunlock;
1397
1398 /* Check out the old directory */
1399
1400 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1401 if (error)
1402 goto out_gunlock;
1403
1404 /* Check out the new directory */
1405
1406 if (nip) {
1407 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1408 if (error)
1409 goto out_gunlock;
1410
1411 if (nip->i_inode.i_nlink == 0) {
1412 error = -EAGAIN;
1413 goto out_gunlock;
1414 }
1415
1416 if (S_ISDIR(nip->i_inode.i_mode)) {
1417 if (nip->i_entries < 2) {
1418 gfs2_consist_inode(nip);
1419 error = -EIO;
1420 goto out_gunlock;
1421 }
1422 if (nip->i_entries > 2) {
1423 error = -ENOTEMPTY;
1424 goto out_gunlock;
1425 }
1426 }
1427 } else {
1428 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1429 if (error)
1430 goto out_gunlock;
1431
1432 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1433 switch (error) {
1434 case -ENOENT:
1435 error = 0;
1436 break;
1437 case 0:
1438 error = -EEXIST;
1439 default:
1440 goto out_gunlock;
1441 };
1442
1443 if (odip != ndip) {
1444 if (!ndip->i_inode.i_nlink) {
1445 error = -ENOENT;
1446 goto out_gunlock;
1447 }
1448 if (ndip->i_entries == (u32)-1) {
1449 error = -EFBIG;
1450 goto out_gunlock;
1451 }
1452 if (S_ISDIR(ip->i_inode.i_mode) &&
1453 ndip->i_inode.i_nlink == (u32)-1) {
1454 error = -EMLINK;
1455 goto out_gunlock;
1456 }
1457 }
1458 }
1459
1460 /* Check out the dir to be renamed */
1461
1462 if (dir_rename) {
1463 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1464 if (error)
1465 goto out_gunlock;
1466 }
1467
1468 if (nip == NULL) {
1469 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1470 if (error)
1471 goto out_gunlock;
1472 }
1473
1474 if (da.nr_blocks) {
1475 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1476 error = gfs2_quota_lock_check(ndip);
1477 if (error)
1478 goto out_gunlock;
1479
1480 error = gfs2_inplace_reserve(ndip, &ap);
1481 if (error)
1482 goto out_gunlock_q;
1483
1484 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1485 4 * RES_LEAF + 4, 0);
1486 if (error)
1487 goto out_ipreserv;
1488 } else {
1489 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1490 5 * RES_LEAF + 4, 0);
1491 if (error)
1492 goto out_gunlock;
1493 }
1494
1495 /* Remove the target file, if it exists */
1496
1497 if (nip)
1498 error = gfs2_unlink_inode(ndip, ndentry);
1499
1500 if (dir_rename) {
1501 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1502 if (error)
1503 goto out_end_trans;
1504 } else {
1505 struct buffer_head *dibh;
1506 error = gfs2_meta_inode_buffer(ip, &dibh);
1507 if (error)
1508 goto out_end_trans;
1509 ip->i_inode.i_ctime = CURRENT_TIME;
1510 gfs2_trans_add_meta(ip->i_gl, dibh);
1511 gfs2_dinode_out(ip, dibh->b_data);
1512 brelse(dibh);
1513 }
1514
1515 error = gfs2_dir_del(odip, odentry);
1516 if (error)
1517 goto out_end_trans;
1518
1519 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1520 if (error)
1521 goto out_end_trans;
1522
1523 out_end_trans:
1524 gfs2_trans_end(sdp);
1525 out_ipreserv:
1526 if (da.nr_blocks)
1527 gfs2_inplace_release(ndip);
1528 out_gunlock_q:
1529 if (da.nr_blocks)
1530 gfs2_quota_unlock(ndip);
1531 out_gunlock:
1532 gfs2_dir_no_add(&da);
1533 while (x--) {
1534 gfs2_glock_dq(ghs + x);
1535 gfs2_holder_uninit(ghs + x);
1536 }
1537 out_gunlock_r:
1538 if (r_gh.gh_gl)
1539 gfs2_glock_dq_uninit(&r_gh);
1540 out:
1541 return error;
1542 }
1543
1544 /**
1545 * gfs2_follow_link - Follow a symbolic link
1546 * @dentry: The dentry of the link
1547 * @nd: Data that we pass to vfs_follow_link()
1548 *
1549 * This can handle symlinks of any size.
1550 *
1551 * Returns: 0 on success or error code
1552 */
1553
1554 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1555 {
1556 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1557 struct gfs2_holder i_gh;
1558 struct buffer_head *dibh;
1559 unsigned int size;
1560 char *buf;
1561 int error;
1562
1563 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1564 error = gfs2_glock_nq(&i_gh);
1565 if (error) {
1566 gfs2_holder_uninit(&i_gh);
1567 nd_set_link(nd, ERR_PTR(error));
1568 return NULL;
1569 }
1570
1571 size = (unsigned int)i_size_read(&ip->i_inode);
1572 if (size == 0) {
1573 gfs2_consist_inode(ip);
1574 buf = ERR_PTR(-EIO);
1575 goto out;
1576 }
1577
1578 error = gfs2_meta_inode_buffer(ip, &dibh);
1579 if (error) {
1580 buf = ERR_PTR(error);
1581 goto out;
1582 }
1583
1584 buf = kzalloc(size + 1, GFP_NOFS);
1585 if (!buf)
1586 buf = ERR_PTR(-ENOMEM);
1587 else
1588 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1589 brelse(dibh);
1590 out:
1591 gfs2_glock_dq_uninit(&i_gh);
1592 nd_set_link(nd, buf);
1593 return NULL;
1594 }
1595
1596 /**
1597 * gfs2_permission -
1598 * @inode: The inode
1599 * @mask: The mask to be tested
1600 * @flags: Indicates whether this is an RCU path walk or not
1601 *
1602 * This may be called from the VFS directly, or from within GFS2 with the
1603 * inode locked, so we look to see if the glock is already locked and only
1604 * lock the glock if its not already been done.
1605 *
1606 * Returns: errno
1607 */
1608
1609 int gfs2_permission(struct inode *inode, int mask)
1610 {
1611 struct gfs2_inode *ip;
1612 struct gfs2_holder i_gh;
1613 int error;
1614 int unlock = 0;
1615
1616
1617 ip = GFS2_I(inode);
1618 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1619 if (mask & MAY_NOT_BLOCK)
1620 return -ECHILD;
1621 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1622 if (error)
1623 return error;
1624 unlock = 1;
1625 }
1626
1627 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1628 error = -EACCES;
1629 else
1630 error = generic_permission(inode, mask);
1631 if (unlock)
1632 gfs2_glock_dq_uninit(&i_gh);
1633
1634 return error;
1635 }
1636
1637 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1638 {
1639 setattr_copy(inode, attr);
1640 mark_inode_dirty(inode);
1641 return 0;
1642 }
1643
1644 /**
1645 * gfs2_setattr_simple -
1646 * @ip:
1647 * @attr:
1648 *
1649 * Returns: errno
1650 */
1651
1652 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1653 {
1654 int error;
1655
1656 if (current->journal_info)
1657 return __gfs2_setattr_simple(inode, attr);
1658
1659 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1660 if (error)
1661 return error;
1662
1663 error = __gfs2_setattr_simple(inode, attr);
1664 gfs2_trans_end(GFS2_SB(inode));
1665 return error;
1666 }
1667
1668 static int setattr_chown(struct inode *inode, struct iattr *attr)
1669 {
1670 struct gfs2_inode *ip = GFS2_I(inode);
1671 struct gfs2_sbd *sdp = GFS2_SB(inode);
1672 kuid_t ouid, nuid;
1673 kgid_t ogid, ngid;
1674 int error;
1675
1676 ouid = inode->i_uid;
1677 ogid = inode->i_gid;
1678 nuid = attr->ia_uid;
1679 ngid = attr->ia_gid;
1680
1681 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1682 ouid = nuid = NO_UID_QUOTA_CHANGE;
1683 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1684 ogid = ngid = NO_GID_QUOTA_CHANGE;
1685
1686 error = get_write_access(inode);
1687 if (error)
1688 return error;
1689
1690 error = gfs2_rs_alloc(ip);
1691 if (error)
1692 goto out;
1693
1694 error = gfs2_rindex_update(sdp);
1695 if (error)
1696 goto out;
1697
1698 error = gfs2_quota_lock(ip, nuid, ngid);
1699 if (error)
1700 goto out;
1701
1702 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1703 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1704 error = gfs2_quota_check(ip, nuid, ngid);
1705 if (error)
1706 goto out_gunlock_q;
1707 }
1708
1709 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1710 if (error)
1711 goto out_gunlock_q;
1712
1713 error = gfs2_setattr_simple(inode, attr);
1714 if (error)
1715 goto out_end_trans;
1716
1717 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1718 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1719 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1720 gfs2_quota_change(ip, -blocks, ouid, ogid);
1721 gfs2_quota_change(ip, blocks, nuid, ngid);
1722 }
1723
1724 out_end_trans:
1725 gfs2_trans_end(sdp);
1726 out_gunlock_q:
1727 gfs2_quota_unlock(ip);
1728 out:
1729 put_write_access(inode);
1730 return error;
1731 }
1732
1733 /**
1734 * gfs2_setattr - Change attributes on an inode
1735 * @dentry: The dentry which is changing
1736 * @attr: The structure describing the change
1737 *
1738 * The VFS layer wants to change one or more of an inodes attributes. Write
1739 * that change out to disk.
1740 *
1741 * Returns: errno
1742 */
1743
1744 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1745 {
1746 struct inode *inode = dentry->d_inode;
1747 struct gfs2_inode *ip = GFS2_I(inode);
1748 struct gfs2_holder i_gh;
1749 int error;
1750
1751 error = gfs2_rs_alloc(ip);
1752 if (error)
1753 return error;
1754
1755 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1756 if (error)
1757 return error;
1758
1759 error = -EPERM;
1760 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1761 goto out;
1762
1763 error = inode_change_ok(inode, attr);
1764 if (error)
1765 goto out;
1766
1767 if (attr->ia_valid & ATTR_SIZE)
1768 error = gfs2_setattr_size(inode, attr->ia_size);
1769 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1770 error = setattr_chown(inode, attr);
1771 else {
1772 error = gfs2_setattr_simple(inode, attr);
1773 if (!error && attr->ia_valid & ATTR_MODE)
1774 error = posix_acl_chmod(inode, inode->i_mode);
1775 }
1776
1777 out:
1778 if (!error)
1779 mark_inode_dirty(inode);
1780 gfs2_glock_dq_uninit(&i_gh);
1781 return error;
1782 }
1783
1784 /**
1785 * gfs2_getattr - Read out an inode's attributes
1786 * @mnt: The vfsmount the inode is being accessed from
1787 * @dentry: The dentry to stat
1788 * @stat: The inode's stats
1789 *
1790 * This may be called from the VFS directly, or from within GFS2 with the
1791 * inode locked, so we look to see if the glock is already locked and only
1792 * lock the glock if its not already been done. Note that its the NFS
1793 * readdirplus operation which causes this to be called (from filldir)
1794 * with the glock already held.
1795 *
1796 * Returns: errno
1797 */
1798
1799 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1800 struct kstat *stat)
1801 {
1802 struct inode *inode = dentry->d_inode;
1803 struct gfs2_inode *ip = GFS2_I(inode);
1804 struct gfs2_holder gh;
1805 int error;
1806 int unlock = 0;
1807
1808 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1809 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1810 if (error)
1811 return error;
1812 unlock = 1;
1813 }
1814
1815 generic_fillattr(inode, stat);
1816 if (unlock)
1817 gfs2_glock_dq_uninit(&gh);
1818
1819 return 0;
1820 }
1821
1822 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1823 const void *data, size_t size, int flags)
1824 {
1825 struct inode *inode = dentry->d_inode;
1826 struct gfs2_inode *ip = GFS2_I(inode);
1827 struct gfs2_holder gh;
1828 int ret;
1829
1830 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1831 ret = gfs2_glock_nq(&gh);
1832 if (ret == 0) {
1833 ret = gfs2_rs_alloc(ip);
1834 if (ret == 0)
1835 ret = generic_setxattr(dentry, name, data, size, flags);
1836 gfs2_glock_dq(&gh);
1837 }
1838 gfs2_holder_uninit(&gh);
1839 return ret;
1840 }
1841
1842 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1843 void *data, size_t size)
1844 {
1845 struct inode *inode = dentry->d_inode;
1846 struct gfs2_inode *ip = GFS2_I(inode);
1847 struct gfs2_holder gh;
1848 int ret;
1849
1850 /* For selinux during lookup */
1851 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1852 return generic_getxattr(dentry, name, data, size);
1853
1854 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1855 ret = gfs2_glock_nq(&gh);
1856 if (ret == 0) {
1857 ret = generic_getxattr(dentry, name, data, size);
1858 gfs2_glock_dq(&gh);
1859 }
1860 gfs2_holder_uninit(&gh);
1861 return ret;
1862 }
1863
1864 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1865 {
1866 struct inode *inode = dentry->d_inode;
1867 struct gfs2_inode *ip = GFS2_I(inode);
1868 struct gfs2_holder gh;
1869 int ret;
1870
1871 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1872 ret = gfs2_glock_nq(&gh);
1873 if (ret == 0) {
1874 ret = gfs2_rs_alloc(ip);
1875 if (ret == 0)
1876 ret = generic_removexattr(dentry, name);
1877 gfs2_glock_dq(&gh);
1878 }
1879 gfs2_holder_uninit(&gh);
1880 return ret;
1881 }
1882
1883 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1884 u64 start, u64 len)
1885 {
1886 struct gfs2_inode *ip = GFS2_I(inode);
1887 struct gfs2_holder gh;
1888 int ret;
1889
1890 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1891 if (ret)
1892 return ret;
1893
1894 mutex_lock(&inode->i_mutex);
1895
1896 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1897 if (ret)
1898 goto out;
1899
1900 if (gfs2_is_stuffed(ip)) {
1901 u64 phys = ip->i_no_addr << inode->i_blkbits;
1902 u64 size = i_size_read(inode);
1903 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1904 FIEMAP_EXTENT_DATA_INLINE;
1905 phys += sizeof(struct gfs2_dinode);
1906 phys += start;
1907 if (start + len > size)
1908 len = size - start;
1909 if (start < size)
1910 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1911 len, flags);
1912 if (ret == 1)
1913 ret = 0;
1914 } else {
1915 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1916 gfs2_block_map);
1917 }
1918
1919 gfs2_glock_dq_uninit(&gh);
1920 out:
1921 mutex_unlock(&inode->i_mutex);
1922 return ret;
1923 }
1924
1925 const struct inode_operations gfs2_file_iops = {
1926 .permission = gfs2_permission,
1927 .setattr = gfs2_setattr,
1928 .getattr = gfs2_getattr,
1929 .setxattr = gfs2_setxattr,
1930 .getxattr = gfs2_getxattr,
1931 .listxattr = gfs2_listxattr,
1932 .removexattr = gfs2_removexattr,
1933 .fiemap = gfs2_fiemap,
1934 .get_acl = gfs2_get_acl,
1935 .set_acl = gfs2_set_acl,
1936 };
1937
1938 const struct inode_operations gfs2_dir_iops = {
1939 .create = gfs2_create,
1940 .lookup = gfs2_lookup,
1941 .link = gfs2_link,
1942 .unlink = gfs2_unlink,
1943 .symlink = gfs2_symlink,
1944 .mkdir = gfs2_mkdir,
1945 .rmdir = gfs2_unlink,
1946 .mknod = gfs2_mknod,
1947 .rename = gfs2_rename,
1948 .permission = gfs2_permission,
1949 .setattr = gfs2_setattr,
1950 .getattr = gfs2_getattr,
1951 .setxattr = gfs2_setxattr,
1952 .getxattr = gfs2_getxattr,
1953 .listxattr = gfs2_listxattr,
1954 .removexattr = gfs2_removexattr,
1955 .fiemap = gfs2_fiemap,
1956 .get_acl = gfs2_get_acl,
1957 .set_acl = gfs2_set_acl,
1958 .atomic_open = gfs2_atomic_open,
1959 };
1960
1961 const struct inode_operations gfs2_symlink_iops = {
1962 .readlink = generic_readlink,
1963 .follow_link = gfs2_follow_link,
1964 .put_link = kfree_put_link,
1965 .permission = gfs2_permission,
1966 .setattr = gfs2_setattr,
1967 .getattr = gfs2_getattr,
1968 .setxattr = gfs2_setxattr,
1969 .getxattr = gfs2_getxattr,
1970 .listxattr = gfs2_listxattr,
1971 .removexattr = gfs2_removexattr,
1972 .fiemap = gfs2_fiemap,
1973 };
1974
(deprecated) Btrfs devel tree