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Bluetooth: vhci: Fix race at creating hci device
[linux/fpc-iii.git] / fs / gfs2 / inode.c
blobc4ed823d150e9609529ef1789874801180bcd4d9
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 struct dentry *d;
600 int error, free_vfs_inode = 0;
601 u32 aflags = 0;
602 unsigned blocks = 1;
603 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
604
605 if (!name->len || name->len > GFS2_FNAMESIZE)
606 return -ENAMETOOLONG;
607
608 error = gfs2_rs_alloc(dip);
609 if (error)
610 return error;
611
612 error = gfs2_rindex_update(sdp);
613 if (error)
614 return error;
615
616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
617 if (error)
618 goto fail;
619
620 error = create_ok(dip, name, mode);
621 if (error)
622 goto fail_gunlock;
623
624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
625 error = PTR_ERR(inode);
626 if (!IS_ERR(inode)) {
627 d = d_splice_alias(inode, dentry);
628 error = PTR_ERR(d);
629 if (IS_ERR(d)) {
630 inode = ERR_CAST(d);
631 goto fail_gunlock;
632 }
633 error = 0;
634 if (file) {
635 if (S_ISREG(inode->i_mode)) {
636 WARN_ON(d != NULL);
637 error = finish_open(file, dentry, gfs2_open_common, opened);
638 } else {
639 error = finish_no_open(file, d);
640 }
641 } else {
642 dput(d);
643 }
644 gfs2_glock_dq_uninit(ghs);
645 return error;
646 } else if (error != -ENOENT) {
647 goto fail_gunlock;
648 }
649
650 error = gfs2_diradd_alloc_required(dir, name, &da);
651 if (error < 0)
652 goto fail_gunlock;
653
654 inode = new_inode(sdp->sd_vfs);
655 error = -ENOMEM;
656 if (!inode)
657 goto fail_gunlock;
658
659 error = posix_acl_create(dir, &mode, &default_acl, &acl);
660 if (error)
661 goto fail_free_vfs_inode;
662
663 ip = GFS2_I(inode);
664 error = gfs2_rs_alloc(ip);
665 if (error)
666 goto fail_free_acls;
667
668 inode->i_mode = mode;
669 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
670 inode->i_rdev = dev;
671 inode->i_size = size;
672 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
673 gfs2_set_inode_blocks(inode, 1);
674 munge_mode_uid_gid(dip, inode);
675 check_and_update_goal(dip);
676 ip->i_goal = dip->i_goal;
677 ip->i_diskflags = 0;
678 ip->i_eattr = 0;
679 ip->i_height = 0;
680 ip->i_depth = 0;
681 ip->i_entries = 0;
682
683 switch(mode & S_IFMT) {
684 case S_IFREG:
685 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
686 gfs2_tune_get(sdp, gt_new_files_jdata))
687 ip->i_diskflags |= GFS2_DIF_JDATA;
688 gfs2_set_aops(inode);
689 break;
690 case S_IFDIR:
691 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
692 ip->i_diskflags |= GFS2_DIF_JDATA;
693 ip->i_entries = 2;
694 break;
695 }
696 gfs2_set_inode_flags(inode);
697
698 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
699 (dip->i_diskflags & GFS2_DIF_TOPDIR))
700 aflags |= GFS2_AF_ORLOV;
701
702 if (default_acl || acl)
703 blocks++;
704
705 error = alloc_dinode(ip, aflags, &blocks);
706 if (error)
707 goto fail_free_inode;
708
709 gfs2_set_inode_blocks(inode, blocks);
710
711 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
712 if (error)
713 goto fail_free_inode;
714
715 ip->i_gl->gl_object = ip;
716 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
717 if (error)
718 goto fail_free_inode;
719
720 error = gfs2_trans_begin(sdp, blocks, 0);
721 if (error)
722 goto fail_gunlock2;
723
724 if (blocks > 1) {
725 ip->i_eattr = ip->i_no_addr + 1;
726 gfs2_init_xattr(ip);
727 }
728 init_dinode(dip, ip, symname);
729 gfs2_trans_end(sdp);
730
731 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
732 if (error)
733 goto fail_gunlock2;
734
735 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
736 if (error)
737 goto fail_gunlock2;
738
739 ip->i_iopen_gh.gh_gl->gl_object = ip;
740 gfs2_glock_put(io_gl);
741 gfs2_set_iop(inode);
742 insert_inode_hash(inode);
743
744 if (default_acl) {
745 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
746 posix_acl_release(default_acl);
747 }
748 if (acl) {
749 if (!error)
750 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
751 posix_acl_release(acl);
752 }
753
754 if (error)
755 goto fail_gunlock3;
756
757 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
758 &gfs2_initxattrs, NULL);
759 if (error)
760 goto fail_gunlock3;
761
762 error = link_dinode(dip, name, ip, &da);
763 if (error)
764 goto fail_gunlock3;
765
766 mark_inode_dirty(inode);
767 d_instantiate(dentry, inode);
768 if (file) {
769 *opened |= FILE_CREATED;
770 error = finish_open(file, dentry, gfs2_open_common, opened);
771 }
772 gfs2_glock_dq_uninit(ghs);
773 gfs2_glock_dq_uninit(ghs + 1);
774 return error;
775
776 fail_gunlock3:
777 gfs2_glock_dq_uninit(ghs + 1);
778 if (ip->i_gl)
779 gfs2_glock_put(ip->i_gl);
780 goto fail_gunlock;
781
782 fail_gunlock2:
783 gfs2_glock_dq_uninit(ghs + 1);
784 fail_free_inode:
785 if (ip->i_gl)
786 gfs2_glock_put(ip->i_gl);
787 gfs2_rs_delete(ip, NULL);
788 fail_free_acls:
789 if (default_acl)
790 posix_acl_release(default_acl);
791 if (acl)
792 posix_acl_release(acl);
793 fail_free_vfs_inode:
794 free_vfs_inode = 1;
795 fail_gunlock:
796 gfs2_dir_no_add(&da);
797 gfs2_glock_dq_uninit(ghs);
798 if (inode && !IS_ERR(inode)) {
799 clear_nlink(inode);
800 if (!free_vfs_inode)
801 mark_inode_dirty(inode);
802 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
803 &GFS2_I(inode)->i_flags);
804 iput(inode);
805 }
806 fail:
807 return error;
808 }
809
810 /**
811 * gfs2_create - Create a file
812 * @dir: The directory in which to create the file
813 * @dentry: The dentry of the new file
814 * @mode: The mode of the new file
815 *
816 * Returns: errno
817 */
818
819 static int gfs2_create(struct inode *dir, struct dentry *dentry,
820 umode_t mode, bool excl)
821 {
822 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
823 }
824
825 /**
826 * __gfs2_lookup - Look up a filename in a directory and return its inode
827 * @dir: The directory inode
828 * @dentry: The dentry of the new inode
829 * @file: File to be opened
830 * @opened: atomic_open flags
831 *
832 *
833 * Returns: errno
834 */
835
836 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
837 struct file *file, int *opened)
838 {
839 struct inode *inode;
840 struct dentry *d;
841 struct gfs2_holder gh;
842 struct gfs2_glock *gl;
843 int error;
844
845 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
846 if (inode == NULL) {
847 d_add(dentry, NULL);
848 return NULL;
849 }
850 if (IS_ERR(inode))
851 return ERR_CAST(inode);
852
853 gl = GFS2_I(inode)->i_gl;
854 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
855 if (error) {
856 iput(inode);
857 return ERR_PTR(error);
858 }
859
860 d = d_splice_alias(inode, dentry);
861 if (IS_ERR(d)) {
862 gfs2_glock_dq_uninit(&gh);
863 return d;
864 }
865 if (file && S_ISREG(inode->i_mode))
866 error = finish_open(file, dentry, gfs2_open_common, opened);
867
868 gfs2_glock_dq_uninit(&gh);
869 if (error) {
870 dput(d);
871 return ERR_PTR(error);
872 }
873 return d;
874 }
875
876 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
877 unsigned flags)
878 {
879 return __gfs2_lookup(dir, dentry, NULL, NULL);
880 }
881
882 /**
883 * gfs2_link - Link to a file
884 * @old_dentry: The inode to link
885 * @dir: Add link to this directory
886 * @dentry: The name of the link
887 *
888 * Link the inode in "old_dentry" into the directory "dir" with the
889 * name in "dentry".
890 *
891 * Returns: errno
892 */
893
894 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
895 struct dentry *dentry)
896 {
897 struct gfs2_inode *dip = GFS2_I(dir);
898 struct gfs2_sbd *sdp = GFS2_SB(dir);
899 struct inode *inode = old_dentry->d_inode;
900 struct gfs2_inode *ip = GFS2_I(inode);
901 struct gfs2_holder ghs[2];
902 struct buffer_head *dibh;
903 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
904 int error;
905
906 if (S_ISDIR(inode->i_mode))
907 return -EPERM;
908
909 error = gfs2_rs_alloc(dip);
910 if (error)
911 return error;
912
913 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
914 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
915
916 error = gfs2_glock_nq(ghs); /* parent */
917 if (error)
918 goto out_parent;
919
920 error = gfs2_glock_nq(ghs + 1); /* child */
921 if (error)
922 goto out_child;
923
924 error = -ENOENT;
925 if (inode->i_nlink == 0)
926 goto out_gunlock;
927
928 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
929 if (error)
930 goto out_gunlock;
931
932 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
933 switch (error) {
934 case -ENOENT:
935 break;
936 case 0:
937 error = -EEXIST;
938 default:
939 goto out_gunlock;
940 }
941
942 error = -EINVAL;
943 if (!dip->i_inode.i_nlink)
944 goto out_gunlock;
945 error = -EFBIG;
946 if (dip->i_entries == (u32)-1)
947 goto out_gunlock;
948 error = -EPERM;
949 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
950 goto out_gunlock;
951 error = -EINVAL;
952 if (!ip->i_inode.i_nlink)
953 goto out_gunlock;
954 error = -EMLINK;
955 if (ip->i_inode.i_nlink == (u32)-1)
956 goto out_gunlock;
957
958 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
959 if (error < 0)
960 goto out_gunlock;
961
962 if (da.nr_blocks) {
963 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
964 error = gfs2_quota_lock_check(dip);
965 if (error)
966 goto out_gunlock;
967
968 error = gfs2_inplace_reserve(dip, &ap);
969 if (error)
970 goto out_gunlock_q;
971
972 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
973 if (error)
974 goto out_ipres;
975 } else {
976 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
977 if (error)
978 goto out_ipres;
979 }
980
981 error = gfs2_meta_inode_buffer(ip, &dibh);
982 if (error)
983 goto out_end_trans;
984
985 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
986 if (error)
987 goto out_brelse;
988
989 gfs2_trans_add_meta(ip->i_gl, dibh);
990 inc_nlink(&ip->i_inode);
991 ip->i_inode.i_ctime = CURRENT_TIME;
992 ihold(inode);
993 d_instantiate(dentry, inode);
994 mark_inode_dirty(inode);
995
996 out_brelse:
997 brelse(dibh);
998 out_end_trans:
999 gfs2_trans_end(sdp);
1000 out_ipres:
1001 if (da.nr_blocks)
1002 gfs2_inplace_release(dip);
1003 out_gunlock_q:
1004 if (da.nr_blocks)
1005 gfs2_quota_unlock(dip);
1006 out_gunlock:
1007 gfs2_dir_no_add(&da);
1008 gfs2_glock_dq(ghs + 1);
1009 out_child:
1010 gfs2_glock_dq(ghs);
1011 out_parent:
1012 gfs2_holder_uninit(ghs);
1013 gfs2_holder_uninit(ghs + 1);
1014 return error;
1015 }
1016
1017 /*
1018 * gfs2_unlink_ok - check to see that a inode is still in a directory
1019 * @dip: the directory
1020 * @name: the name of the file
1021 * @ip: the inode
1022 *
1023 * Assumes that the lock on (at least) @dip is held.
1024 *
1025 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1026 */
1027
1028 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1029 const struct gfs2_inode *ip)
1030 {
1031 int error;
1032
1033 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1034 return -EPERM;
1035
1036 if ((dip->i_inode.i_mode & S_ISVTX) &&
1037 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1038 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1039 return -EPERM;
1040
1041 if (IS_APPEND(&dip->i_inode))
1042 return -EPERM;
1043
1044 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1045 if (error)
1046 return error;
1047
1048 error = gfs2_dir_check(&dip->i_inode, name, ip);
1049 if (error)
1050 return error;
1051
1052 return 0;
1053 }
1054
1055 /**
1056 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1057 * @dip: The parent directory
1058 * @name: The name of the entry in the parent directory
1059 * @inode: The inode to be removed
1060 *
1061 * Called with all the locks and in a transaction. This will only be
1062 * called for a directory after it has been checked to ensure it is empty.
1063 *
1064 * Returns: 0 on success, or an error
1065 */
1066
1067 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1068 const struct dentry *dentry)
1069 {
1070 struct inode *inode = dentry->d_inode;
1071 struct gfs2_inode *ip = GFS2_I(inode);
1072 int error;
1073
1074 error = gfs2_dir_del(dip, dentry);
1075 if (error)
1076 return error;
1077
1078 ip->i_entries = 0;
1079 inode->i_ctime = CURRENT_TIME;
1080 if (S_ISDIR(inode->i_mode))
1081 clear_nlink(inode);
1082 else
1083 drop_nlink(inode);
1084 mark_inode_dirty(inode);
1085 if (inode->i_nlink == 0)
1086 gfs2_unlink_di(inode);
1087 return 0;
1088 }
1089
1090
1091 /**
1092 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1093 * @dir: The inode of the directory containing the inode to unlink
1094 * @dentry: The file itself
1095 *
1096 * This routine uses the type of the inode as a flag to figure out
1097 * whether this is an unlink or an rmdir.
1098 *
1099 * Returns: errno
1100 */
1101
1102 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1103 {
1104 struct gfs2_inode *dip = GFS2_I(dir);
1105 struct gfs2_sbd *sdp = GFS2_SB(dir);
1106 struct inode *inode = dentry->d_inode;
1107 struct gfs2_inode *ip = GFS2_I(inode);
1108 struct gfs2_holder ghs[3];
1109 struct gfs2_rgrpd *rgd;
1110 int error;
1111
1112 error = gfs2_rindex_update(sdp);
1113 if (error)
1114 return error;
1115
1116 error = -EROFS;
1117
1118 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1119 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1120
1121 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1122 if (!rgd)
1123 goto out_inodes;
1124
1125 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1126
1127
1128 error = gfs2_glock_nq(ghs); /* parent */
1129 if (error)
1130 goto out_parent;
1131
1132 error = gfs2_glock_nq(ghs + 1); /* child */
1133 if (error)
1134 goto out_child;
1135
1136 error = -ENOENT;
1137 if (inode->i_nlink == 0)
1138 goto out_rgrp;
1139
1140 if (S_ISDIR(inode->i_mode)) {
1141 error = -ENOTEMPTY;
1142 if (ip->i_entries > 2 || inode->i_nlink > 2)
1143 goto out_rgrp;
1144 }
1145
1146 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1147 if (error)
1148 goto out_rgrp;
1149
1150 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1151 if (error)
1152 goto out_gunlock;
1153
1154 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1155 if (error)
1156 goto out_end_trans;
1157
1158 error = gfs2_unlink_inode(dip, dentry);
1159
1160 out_end_trans:
1161 gfs2_trans_end(sdp);
1162 out_gunlock:
1163 gfs2_glock_dq(ghs + 2);
1164 out_rgrp:
1165 gfs2_glock_dq(ghs + 1);
1166 out_child:
1167 gfs2_glock_dq(ghs);
1168 out_parent:
1169 gfs2_holder_uninit(ghs + 2);
1170 out_inodes:
1171 gfs2_holder_uninit(ghs + 1);
1172 gfs2_holder_uninit(ghs);
1173 return error;
1174 }
1175
1176 /**
1177 * gfs2_symlink - Create a symlink
1178 * @dir: The directory to create the symlink in
1179 * @dentry: The dentry to put the symlink in
1180 * @symname: The thing which the link points to
1181 *
1182 * Returns: errno
1183 */
1184
1185 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1186 const char *symname)
1187 {
1188 struct gfs2_sbd *sdp = GFS2_SB(dir);
1189 unsigned int size;
1190
1191 size = strlen(symname);
1192 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1193 return -ENAMETOOLONG;
1194
1195 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1196 }
1197
1198 /**
1199 * gfs2_mkdir - Make a directory
1200 * @dir: The parent directory of the new one
1201 * @dentry: The dentry of the new directory
1202 * @mode: The mode of the new directory
1203 *
1204 * Returns: errno
1205 */
1206
1207 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1208 {
1209 struct gfs2_sbd *sdp = GFS2_SB(dir);
1210 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1211 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1212 }
1213
1214 /**
1215 * gfs2_mknod - Make a special file
1216 * @dir: The directory in which the special file will reside
1217 * @dentry: The dentry of the special file
1218 * @mode: The mode of the special file
1219 * @dev: The device specification of the special file
1220 *
1221 */
1222
1223 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1224 dev_t dev)
1225 {
1226 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1227 }
1228
1229 /**
1230 * gfs2_atomic_open - Atomically open a file
1231 * @dir: The directory
1232 * @dentry: The proposed new entry
1233 * @file: The proposed new struct file
1234 * @flags: open flags
1235 * @mode: File mode
1236 * @opened: Flag to say whether the file has been opened or not
1237 *
1238 * Returns: error code or 0 for success
1239 */
1240
1241 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1242 struct file *file, unsigned flags,
1243 umode_t mode, int *opened)
1244 {
1245 struct dentry *d;
1246 bool excl = !!(flags & O_EXCL);
1247
1248 if (!d_unhashed(dentry))
1249 goto skip_lookup;
1250
1251 d = __gfs2_lookup(dir, dentry, file, opened);
1252 if (IS_ERR(d))
1253 return PTR_ERR(d);
1254 if (d != NULL)
1255 dentry = d;
1256 if (dentry->d_inode) {
1257 if (!(*opened & FILE_OPENED)) {
1258 if (d == NULL)
1259 dget(dentry);
1260 return finish_no_open(file, dentry);
1261 }
1262 dput(d);
1263 return 0;
1264 }
1265
1266 BUG_ON(d != NULL);
1267
1268 skip_lookup:
1269 if (!(flags & O_CREAT))
1270 return -ENOENT;
1271
1272 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1273 }
1274
1275 /*
1276 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1277 * @this: move this
1278 * @to: to here
1279 *
1280 * Follow @to back to the root and make sure we don't encounter @this
1281 * Assumes we already hold the rename lock.
1282 *
1283 * Returns: errno
1284 */
1285
1286 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1287 {
1288 struct inode *dir = &to->i_inode;
1289 struct super_block *sb = dir->i_sb;
1290 struct inode *tmp;
1291 int error = 0;
1292
1293 igrab(dir);
1294
1295 for (;;) {
1296 if (dir == &this->i_inode) {
1297 error = -EINVAL;
1298 break;
1299 }
1300 if (dir == sb->s_root->d_inode) {
1301 error = 0;
1302 break;
1303 }
1304
1305 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1306 if (!tmp) {
1307 error = -ENOENT;
1308 break;
1309 }
1310 if (IS_ERR(tmp)) {
1311 error = PTR_ERR(tmp);
1312 break;
1313 }
1314
1315 iput(dir);
1316 dir = tmp;
1317 }
1318
1319 iput(dir);
1320
1321 return error;
1322 }
1323
1324 /**
1325 * gfs2_rename - Rename a file
1326 * @odir: Parent directory of old file name
1327 * @odentry: The old dentry of the file
1328 * @ndir: Parent directory of new file name
1329 * @ndentry: The new dentry of the file
1330 *
1331 * Returns: errno
1332 */
1333
1334 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1335 struct inode *ndir, struct dentry *ndentry)
1336 {
1337 struct gfs2_inode *odip = GFS2_I(odir);
1338 struct gfs2_inode *ndip = GFS2_I(ndir);
1339 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1340 struct gfs2_inode *nip = NULL;
1341 struct gfs2_sbd *sdp = GFS2_SB(odir);
1342 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1343 struct gfs2_rgrpd *nrgd;
1344 unsigned int num_gh;
1345 int dir_rename = 0;
1346 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1347 unsigned int x;
1348 int error;
1349
1350 if (ndentry->d_inode) {
1351 nip = GFS2_I(ndentry->d_inode);
1352 if (ip == nip)
1353 return 0;
1354 }
1355
1356 error = gfs2_rindex_update(sdp);
1357 if (error)
1358 return error;
1359
1360 error = gfs2_rs_alloc(ndip);
1361 if (error)
1362 return error;
1363
1364 if (odip != ndip) {
1365 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1366 0, &r_gh);
1367 if (error)
1368 goto out;
1369
1370 if (S_ISDIR(ip->i_inode.i_mode)) {
1371 dir_rename = 1;
1372 /* don't move a dirctory into it's subdir */
1373 error = gfs2_ok_to_move(ip, ndip);
1374 if (error)
1375 goto out_gunlock_r;
1376 }
1377 }
1378
1379 num_gh = 1;
1380 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1381 if (odip != ndip) {
1382 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1383 num_gh++;
1384 }
1385 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1386 num_gh++;
1387
1388 if (nip) {
1389 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1390 num_gh++;
1391 /* grab the resource lock for unlink flag twiddling
1392 * this is the case of the target file already existing
1393 * so we unlink before doing the rename
1394 */
1395 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1396 if (nrgd)
1397 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1398 }
1399
1400 for (x = 0; x < num_gh; x++) {
1401 error = gfs2_glock_nq(ghs + x);
1402 if (error)
1403 goto out_gunlock;
1404 }
1405
1406 error = -ENOENT;
1407 if (ip->i_inode.i_nlink == 0)
1408 goto out_gunlock;
1409
1410 /* Check out the old directory */
1411
1412 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1413 if (error)
1414 goto out_gunlock;
1415
1416 /* Check out the new directory */
1417
1418 if (nip) {
1419 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1420 if (error)
1421 goto out_gunlock;
1422
1423 if (nip->i_inode.i_nlink == 0) {
1424 error = -EAGAIN;
1425 goto out_gunlock;
1426 }
1427
1428 if (S_ISDIR(nip->i_inode.i_mode)) {
1429 if (nip->i_entries < 2) {
1430 gfs2_consist_inode(nip);
1431 error = -EIO;
1432 goto out_gunlock;
1433 }
1434 if (nip->i_entries > 2) {
1435 error = -ENOTEMPTY;
1436 goto out_gunlock;
1437 }
1438 }
1439 } else {
1440 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1441 if (error)
1442 goto out_gunlock;
1443
1444 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1445 switch (error) {
1446 case -ENOENT:
1447 error = 0;
1448 break;
1449 case 0:
1450 error = -EEXIST;
1451 default:
1452 goto out_gunlock;
1453 };
1454
1455 if (odip != ndip) {
1456 if (!ndip->i_inode.i_nlink) {
1457 error = -ENOENT;
1458 goto out_gunlock;
1459 }
1460 if (ndip->i_entries == (u32)-1) {
1461 error = -EFBIG;
1462 goto out_gunlock;
1463 }
1464 if (S_ISDIR(ip->i_inode.i_mode) &&
1465 ndip->i_inode.i_nlink == (u32)-1) {
1466 error = -EMLINK;
1467 goto out_gunlock;
1468 }
1469 }
1470 }
1471
1472 /* Check out the dir to be renamed */
1473
1474 if (dir_rename) {
1475 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1476 if (error)
1477 goto out_gunlock;
1478 }
1479
1480 if (nip == NULL) {
1481 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1482 if (error)
1483 goto out_gunlock;
1484 }
1485
1486 if (da.nr_blocks) {
1487 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1488 error = gfs2_quota_lock_check(ndip);
1489 if (error)
1490 goto out_gunlock;
1491
1492 error = gfs2_inplace_reserve(ndip, &ap);
1493 if (error)
1494 goto out_gunlock_q;
1495
1496 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1497 4 * RES_LEAF + 4, 0);
1498 if (error)
1499 goto out_ipreserv;
1500 } else {
1501 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1502 5 * RES_LEAF + 4, 0);
1503 if (error)
1504 goto out_gunlock;
1505 }
1506
1507 /* Remove the target file, if it exists */
1508
1509 if (nip)
1510 error = gfs2_unlink_inode(ndip, ndentry);
1511
1512 if (dir_rename) {
1513 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1514 if (error)
1515 goto out_end_trans;
1516 } else {
1517 struct buffer_head *dibh;
1518 error = gfs2_meta_inode_buffer(ip, &dibh);
1519 if (error)
1520 goto out_end_trans;
1521 ip->i_inode.i_ctime = CURRENT_TIME;
1522 gfs2_trans_add_meta(ip->i_gl, dibh);
1523 gfs2_dinode_out(ip, dibh->b_data);
1524 brelse(dibh);
1525 }
1526
1527 error = gfs2_dir_del(odip, odentry);
1528 if (error)
1529 goto out_end_trans;
1530
1531 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1532 if (error)
1533 goto out_end_trans;
1534
1535 out_end_trans:
1536 gfs2_trans_end(sdp);
1537 out_ipreserv:
1538 if (da.nr_blocks)
1539 gfs2_inplace_release(ndip);
1540 out_gunlock_q:
1541 if (da.nr_blocks)
1542 gfs2_quota_unlock(ndip);
1543 out_gunlock:
1544 gfs2_dir_no_add(&da);
1545 while (x--) {
1546 gfs2_glock_dq(ghs + x);
1547 gfs2_holder_uninit(ghs + x);
1548 }
1549 out_gunlock_r:
1550 if (r_gh.gh_gl)
1551 gfs2_glock_dq_uninit(&r_gh);
1552 out:
1553 return error;
1554 }
1555
1556 /**
1557 * gfs2_follow_link - Follow a symbolic link
1558 * @dentry: The dentry of the link
1559 * @nd: Data that we pass to vfs_follow_link()
1560 *
1561 * This can handle symlinks of any size.
1562 *
1563 * Returns: 0 on success or error code
1564 */
1565
1566 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1567 {
1568 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1569 struct gfs2_holder i_gh;
1570 struct buffer_head *dibh;
1571 unsigned int size;
1572 char *buf;
1573 int error;
1574
1575 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1576 error = gfs2_glock_nq(&i_gh);
1577 if (error) {
1578 gfs2_holder_uninit(&i_gh);
1579 nd_set_link(nd, ERR_PTR(error));
1580 return NULL;
1581 }
1582
1583 size = (unsigned int)i_size_read(&ip->i_inode);
1584 if (size == 0) {
1585 gfs2_consist_inode(ip);
1586 buf = ERR_PTR(-EIO);
1587 goto out;
1588 }
1589
1590 error = gfs2_meta_inode_buffer(ip, &dibh);
1591 if (error) {
1592 buf = ERR_PTR(error);
1593 goto out;
1594 }
1595
1596 buf = kzalloc(size + 1, GFP_NOFS);
1597 if (!buf)
1598 buf = ERR_PTR(-ENOMEM);
1599 else
1600 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1601 brelse(dibh);
1602 out:
1603 gfs2_glock_dq_uninit(&i_gh);
1604 nd_set_link(nd, buf);
1605 return NULL;
1606 }
1607
1608 /**
1609 * gfs2_permission -
1610 * @inode: The inode
1611 * @mask: The mask to be tested
1612 * @flags: Indicates whether this is an RCU path walk or not
1613 *
1614 * This may be called from the VFS directly, or from within GFS2 with the
1615 * inode locked, so we look to see if the glock is already locked and only
1616 * lock the glock if its not already been done.
1617 *
1618 * Returns: errno
1619 */
1620
1621 int gfs2_permission(struct inode *inode, int mask)
1622 {
1623 struct gfs2_inode *ip;
1624 struct gfs2_holder i_gh;
1625 struct gfs2_sbd *sdp = GFS2_SB(inode);
1626 int error;
1627 int unlock = 0;
1628 int frozen_root = 0;
1629
1630
1631 ip = GFS2_I(inode);
1632 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1633 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) &&
1634 inode == sdp->sd_root_dir->d_inode &&
1635 atomic_inc_not_zero(&sdp->sd_frozen_root)))
1636 frozen_root = 1;
1637 else {
1638 if (mask & MAY_NOT_BLOCK)
1639 return -ECHILD;
1640 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1641 if (error)
1642 return error;
1643 unlock = 1;
1644 }
1645 }
1646
1647 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1648 error = -EACCES;
1649 else
1650 error = generic_permission(inode, mask);
1651 if (unlock)
1652 gfs2_glock_dq_uninit(&i_gh);
1653 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root))
1654 wake_up(&sdp->sd_frozen_root_wait);
1655
1656 return error;
1657 }
1658
1659 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1660 {
1661 setattr_copy(inode, attr);
1662 mark_inode_dirty(inode);
1663 return 0;
1664 }
1665
1666 /**
1667 * gfs2_setattr_simple -
1668 * @ip:
1669 * @attr:
1670 *
1671 * Returns: errno
1672 */
1673
1674 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1675 {
1676 int error;
1677
1678 if (current->journal_info)
1679 return __gfs2_setattr_simple(inode, attr);
1680
1681 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1682 if (error)
1683 return error;
1684
1685 error = __gfs2_setattr_simple(inode, attr);
1686 gfs2_trans_end(GFS2_SB(inode));
1687 return error;
1688 }
1689
1690 static int setattr_chown(struct inode *inode, struct iattr *attr)
1691 {
1692 struct gfs2_inode *ip = GFS2_I(inode);
1693 struct gfs2_sbd *sdp = GFS2_SB(inode);
1694 kuid_t ouid, nuid;
1695 kgid_t ogid, ngid;
1696 int error;
1697
1698 ouid = inode->i_uid;
1699 ogid = inode->i_gid;
1700 nuid = attr->ia_uid;
1701 ngid = attr->ia_gid;
1702
1703 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1704 ouid = nuid = NO_UID_QUOTA_CHANGE;
1705 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1706 ogid = ngid = NO_GID_QUOTA_CHANGE;
1707
1708 error = get_write_access(inode);
1709 if (error)
1710 return error;
1711
1712 error = gfs2_rs_alloc(ip);
1713 if (error)
1714 goto out;
1715
1716 error = gfs2_rindex_update(sdp);
1717 if (error)
1718 goto out;
1719
1720 error = gfs2_quota_lock(ip, nuid, ngid);
1721 if (error)
1722 goto out;
1723
1724 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1725 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1726 error = gfs2_quota_check(ip, nuid, ngid);
1727 if (error)
1728 goto out_gunlock_q;
1729 }
1730
1731 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1732 if (error)
1733 goto out_gunlock_q;
1734
1735 error = gfs2_setattr_simple(inode, attr);
1736 if (error)
1737 goto out_end_trans;
1738
1739 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1740 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1741 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1742 gfs2_quota_change(ip, -blocks, ouid, ogid);
1743 gfs2_quota_change(ip, blocks, nuid, ngid);
1744 }
1745
1746 out_end_trans:
1747 gfs2_trans_end(sdp);
1748 out_gunlock_q:
1749 gfs2_quota_unlock(ip);
1750 out:
1751 put_write_access(inode);
1752 return error;
1753 }
1754
1755 /**
1756 * gfs2_setattr - Change attributes on an inode
1757 * @dentry: The dentry which is changing
1758 * @attr: The structure describing the change
1759 *
1760 * The VFS layer wants to change one or more of an inodes attributes. Write
1761 * that change out to disk.
1762 *
1763 * Returns: errno
1764 */
1765
1766 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1767 {
1768 struct inode *inode = dentry->d_inode;
1769 struct gfs2_inode *ip = GFS2_I(inode);
1770 struct gfs2_holder i_gh;
1771 int error;
1772
1773 error = gfs2_rs_alloc(ip);
1774 if (error)
1775 return error;
1776
1777 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1778 if (error)
1779 return error;
1780
1781 error = -EPERM;
1782 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1783 goto out;
1784
1785 error = inode_change_ok(inode, attr);
1786 if (error)
1787 goto out;
1788
1789 if (attr->ia_valid & ATTR_SIZE)
1790 error = gfs2_setattr_size(inode, attr->ia_size);
1791 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1792 error = setattr_chown(inode, attr);
1793 else {
1794 error = gfs2_setattr_simple(inode, attr);
1795 if (!error && attr->ia_valid & ATTR_MODE)
1796 error = posix_acl_chmod(inode, inode->i_mode);
1797 }
1798
1799 out:
1800 if (!error)
1801 mark_inode_dirty(inode);
1802 gfs2_glock_dq_uninit(&i_gh);
1803 return error;
1804 }
1805
1806 /**
1807 * gfs2_getattr - Read out an inode's attributes
1808 * @mnt: The vfsmount the inode is being accessed from
1809 * @dentry: The dentry to stat
1810 * @stat: The inode's stats
1811 *
1812 * This may be called from the VFS directly, or from within GFS2 with the
1813 * inode locked, so we look to see if the glock is already locked and only
1814 * lock the glock if its not already been done. Note that its the NFS
1815 * readdirplus operation which causes this to be called (from filldir)
1816 * with the glock already held.
1817 *
1818 * Returns: errno
1819 */
1820
1821 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1822 struct kstat *stat)
1823 {
1824 struct inode *inode = dentry->d_inode;
1825 struct gfs2_inode *ip = GFS2_I(inode);
1826 struct gfs2_holder gh;
1827 struct gfs2_sbd *sdp = GFS2_SB(inode);
1828 int error;
1829 int unlock = 0;
1830 int frozen_root = 0;
1831
1832 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1833 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) &&
1834 inode == sdp->sd_root_dir->d_inode &&
1835 atomic_inc_not_zero(&sdp->sd_frozen_root)))
1836 frozen_root = 1;
1837 else {
1838 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1839 if (error)
1840 return error;
1841 unlock = 1;
1842 }
1843 }
1844
1845 generic_fillattr(inode, stat);
1846 if (unlock)
1847 gfs2_glock_dq_uninit(&gh);
1848 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root))
1849 wake_up(&sdp->sd_frozen_root_wait);
1850
1851 return 0;
1852 }
1853
1854 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1855 const void *data, size_t size, int flags)
1856 {
1857 struct inode *inode = dentry->d_inode;
1858 struct gfs2_inode *ip = GFS2_I(inode);
1859 struct gfs2_holder gh;
1860 int ret;
1861
1862 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1863 ret = gfs2_glock_nq(&gh);
1864 if (ret == 0) {
1865 ret = gfs2_rs_alloc(ip);
1866 if (ret == 0)
1867 ret = generic_setxattr(dentry, name, data, size, flags);
1868 gfs2_glock_dq(&gh);
1869 }
1870 gfs2_holder_uninit(&gh);
1871 return ret;
1872 }
1873
1874 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1875 void *data, size_t size)
1876 {
1877 struct inode *inode = dentry->d_inode;
1878 struct gfs2_inode *ip = GFS2_I(inode);
1879 struct gfs2_holder gh;
1880 int ret;
1881
1882 /* For selinux during lookup */
1883 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1884 return generic_getxattr(dentry, name, data, size);
1885
1886 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1887 ret = gfs2_glock_nq(&gh);
1888 if (ret == 0) {
1889 ret = generic_getxattr(dentry, name, data, size);
1890 gfs2_glock_dq(&gh);
1891 }
1892 gfs2_holder_uninit(&gh);
1893 return ret;
1894 }
1895
1896 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1897 {
1898 struct inode *inode = dentry->d_inode;
1899 struct gfs2_inode *ip = GFS2_I(inode);
1900 struct gfs2_holder gh;
1901 int ret;
1902
1903 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1904 ret = gfs2_glock_nq(&gh);
1905 if (ret == 0) {
1906 ret = gfs2_rs_alloc(ip);
1907 if (ret == 0)
1908 ret = generic_removexattr(dentry, name);
1909 gfs2_glock_dq(&gh);
1910 }
1911 gfs2_holder_uninit(&gh);
1912 return ret;
1913 }
1914
1915 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1916 u64 start, u64 len)
1917 {
1918 struct gfs2_inode *ip = GFS2_I(inode);
1919 struct gfs2_holder gh;
1920 int ret;
1921
1922 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1923 if (ret)
1924 return ret;
1925
1926 mutex_lock(&inode->i_mutex);
1927
1928 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1929 if (ret)
1930 goto out;
1931
1932 if (gfs2_is_stuffed(ip)) {
1933 u64 phys = ip->i_no_addr << inode->i_blkbits;
1934 u64 size = i_size_read(inode);
1935 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1936 FIEMAP_EXTENT_DATA_INLINE;
1937 phys += sizeof(struct gfs2_dinode);
1938 phys += start;
1939 if (start + len > size)
1940 len = size - start;
1941 if (start < size)
1942 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1943 len, flags);
1944 if (ret == 1)
1945 ret = 0;
1946 } else {
1947 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1948 gfs2_block_map);
1949 }
1950
1951 gfs2_glock_dq_uninit(&gh);
1952 out:
1953 mutex_unlock(&inode->i_mutex);
1954 return ret;
1955 }
1956
1957 const struct inode_operations gfs2_file_iops = {
1958 .permission = gfs2_permission,
1959 .setattr = gfs2_setattr,
1960 .getattr = gfs2_getattr,
1961 .setxattr = gfs2_setxattr,
1962 .getxattr = gfs2_getxattr,
1963 .listxattr = gfs2_listxattr,
1964 .removexattr = gfs2_removexattr,
1965 .fiemap = gfs2_fiemap,
1966 .get_acl = gfs2_get_acl,
1967 .set_acl = gfs2_set_acl,
1968 };
1969
1970 const struct inode_operations gfs2_dir_iops = {
1971 .create = gfs2_create,
1972 .lookup = gfs2_lookup,
1973 .link = gfs2_link,
1974 .unlink = gfs2_unlink,
1975 .symlink = gfs2_symlink,
1976 .mkdir = gfs2_mkdir,
1977 .rmdir = gfs2_unlink,
1978 .mknod = gfs2_mknod,
1979 .rename = gfs2_rename,
1980 .permission = gfs2_permission,
1981 .setattr = gfs2_setattr,
1982 .getattr = gfs2_getattr,
1983 .setxattr = gfs2_setxattr,
1984 .getxattr = gfs2_getxattr,
1985 .listxattr = gfs2_listxattr,
1986 .removexattr = gfs2_removexattr,
1987 .fiemap = gfs2_fiemap,
1988 .get_acl = gfs2_get_acl,
1989 .set_acl = gfs2_set_acl,
1990 .atomic_open = gfs2_atomic_open,
1991 };
1992
1993 const struct inode_operations gfs2_symlink_iops = {
1994 .readlink = generic_readlink,
1995 .follow_link = gfs2_follow_link,
1996 .put_link = kfree_put_link,
1997 .permission = gfs2_permission,
1998 .setattr = gfs2_setattr,
1999 .getattr = gfs2_getattr,
2000 .setxattr = gfs2_setxattr,
2001 .getxattr = gfs2_getxattr,
2002 .listxattr = gfs2_listxattr,
2003 .removexattr = gfs2_removexattr,
2004 .fiemap = gfs2_fiemap,
2005 };
2006
Linux with added FPC-III support