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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / fs / gfs2 / inode.c
blob6f7f848a3c4e438fd8db5801ded3f09294bf2669
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 == d_inode(sb->s_root))) {
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, &ap);
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, &ap);
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
547 gfs2_trans_end(sdp);
548 fail_ipreserv:
549 gfs2_inplace_release(dip);
550 fail_quota_locks:
551 gfs2_quota_unlock(dip);
552 return error;
553 }
554
555 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
556 void *fs_info)
557 {
558 const struct xattr *xattr;
559 int err = 0;
560
561 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
562 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
563 xattr->value_len, 0,
564 GFS2_EATYPE_SECURITY);
565 if (err < 0)
566 break;
567 }
568 return err;
569 }
570
571 /**
572 * gfs2_create_inode - Create a new inode
573 * @dir: The parent directory
574 * @dentry: The new dentry
575 * @file: If non-NULL, the file which is being opened
576 * @mode: The permissions on the new inode
577 * @dev: For device nodes, this is the device number
578 * @symname: For symlinks, this is the link destination
579 * @size: The initial size of the inode (ignored for directories)
580 *
581 * Returns: 0 on success, or error code
582 */
583
584 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
585 struct file *file,
586 umode_t mode, dev_t dev, const char *symname,
587 unsigned int size, int excl, int *opened)
588 {
589 const struct qstr *name = &dentry->d_name;
590 struct posix_acl *default_acl, *acl;
591 struct gfs2_holder ghs[2];
592 struct inode *inode = NULL;
593 struct gfs2_inode *dip = GFS2_I(dir), *ip;
594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
595 struct gfs2_glock *io_gl;
596 int error, free_vfs_inode = 0;
597 u32 aflags = 0;
598 unsigned blocks = 1;
599 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
600
601 if (!name->len || name->len > GFS2_FNAMESIZE)
602 return -ENAMETOOLONG;
603
604 error = gfs2_rs_alloc(dip);
605 if (error)
606 return error;
607
608 error = gfs2_rindex_update(sdp);
609 if (error)
610 return error;
611
612 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613 if (error)
614 goto fail;
615
616 error = create_ok(dip, name, mode);
617 if (error)
618 goto fail_gunlock;
619
620 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
621 error = PTR_ERR(inode);
622 if (!IS_ERR(inode)) {
623 if (S_ISDIR(inode->i_mode)) {
624 iput(inode);
625 inode = ERR_PTR(-EISDIR);
626 goto fail_gunlock;
627 }
628 d_instantiate(dentry, inode);
629 error = 0;
630 if (file) {
631 if (S_ISREG(inode->i_mode))
632 error = finish_open(file, dentry, gfs2_open_common, opened);
633 else
634 error = finish_no_open(file, NULL);
635 }
636 gfs2_glock_dq_uninit(ghs);
637 return error;
638 } else if (error != -ENOENT) {
639 goto fail_gunlock;
640 }
641
642 error = gfs2_diradd_alloc_required(dir, name, &da);
643 if (error < 0)
644 goto fail_gunlock;
645
646 inode = new_inode(sdp->sd_vfs);
647 error = -ENOMEM;
648 if (!inode)
649 goto fail_gunlock;
650
651 error = posix_acl_create(dir, &mode, &default_acl, &acl);
652 if (error)
653 goto fail_free_vfs_inode;
654
655 ip = GFS2_I(inode);
656 error = gfs2_rs_alloc(ip);
657 if (error)
658 goto fail_free_acls;
659
660 inode->i_mode = mode;
661 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662 inode->i_rdev = dev;
663 inode->i_size = size;
664 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665 gfs2_set_inode_blocks(inode, 1);
666 munge_mode_uid_gid(dip, inode);
667 check_and_update_goal(dip);
668 ip->i_goal = dip->i_goal;
669 ip->i_diskflags = 0;
670 ip->i_eattr = 0;
671 ip->i_height = 0;
672 ip->i_depth = 0;
673 ip->i_entries = 0;
674
675 switch(mode & S_IFMT) {
676 case S_IFREG:
677 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
678 gfs2_tune_get(sdp, gt_new_files_jdata))
679 ip->i_diskflags |= GFS2_DIF_JDATA;
680 gfs2_set_aops(inode);
681 break;
682 case S_IFDIR:
683 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 ip->i_entries = 2;
686 break;
687 }
688 gfs2_set_inode_flags(inode);
689
690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
691 (dip->i_diskflags & GFS2_DIF_TOPDIR))
692 aflags |= GFS2_AF_ORLOV;
693
694 if (default_acl || acl)
695 blocks++;
696
697 error = alloc_dinode(ip, aflags, &blocks);
698 if (error)
699 goto fail_free_inode;
700
701 gfs2_set_inode_blocks(inode, blocks);
702
703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704 if (error)
705 goto fail_free_inode;
706
707 ip->i_gl->gl_object = ip;
708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
709 if (error)
710 goto fail_free_inode;
711
712 error = gfs2_trans_begin(sdp, blocks, 0);
713 if (error)
714 goto fail_gunlock2;
715
716 if (blocks > 1) {
717 ip->i_eattr = ip->i_no_addr + 1;
718 gfs2_init_xattr(ip);
719 }
720 init_dinode(dip, ip, symname);
721 gfs2_trans_end(sdp);
722
723 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
724 if (error)
725 goto fail_gunlock2;
726
727 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
728 if (error)
729 goto fail_gunlock2;
730
731 ip->i_iopen_gh.gh_gl->gl_object = ip;
732 gfs2_glock_put(io_gl);
733 gfs2_set_iop(inode);
734 insert_inode_hash(inode);
735
736 if (default_acl) {
737 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
738 posix_acl_release(default_acl);
739 }
740 if (acl) {
741 if (!error)
742 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
743 posix_acl_release(acl);
744 }
745
746 if (error)
747 goto fail_gunlock3;
748
749 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
750 &gfs2_initxattrs, NULL);
751 if (error)
752 goto fail_gunlock3;
753
754 error = link_dinode(dip, name, ip, &da);
755 if (error)
756 goto fail_gunlock3;
757
758 mark_inode_dirty(inode);
759 d_instantiate(dentry, inode);
760 if (file) {
761 *opened |= FILE_CREATED;
762 error = finish_open(file, dentry, gfs2_open_common, opened);
763 }
764 gfs2_glock_dq_uninit(ghs);
765 gfs2_glock_dq_uninit(ghs + 1);
766 return error;
767
768 fail_gunlock3:
769 gfs2_glock_dq_uninit(ghs + 1);
770 if (ip->i_gl)
771 gfs2_glock_put(ip->i_gl);
772 goto fail_gunlock;
773
774 fail_gunlock2:
775 gfs2_glock_dq_uninit(ghs + 1);
776 fail_free_inode:
777 if (ip->i_gl)
778 gfs2_glock_put(ip->i_gl);
779 gfs2_rs_delete(ip, NULL);
780 fail_free_acls:
781 if (default_acl)
782 posix_acl_release(default_acl);
783 if (acl)
784 posix_acl_release(acl);
785 fail_free_vfs_inode:
786 free_vfs_inode = 1;
787 fail_gunlock:
788 gfs2_dir_no_add(&da);
789 gfs2_glock_dq_uninit(ghs);
790 if (inode && !IS_ERR(inode)) {
791 clear_nlink(inode);
792 if (!free_vfs_inode)
793 mark_inode_dirty(inode);
794 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
795 &GFS2_I(inode)->i_flags);
796 iput(inode);
797 }
798 fail:
799 return error;
800 }
801
802 /**
803 * gfs2_create - Create a file
804 * @dir: The directory in which to create the file
805 * @dentry: The dentry of the new file
806 * @mode: The mode of the new file
807 *
808 * Returns: errno
809 */
810
811 static int gfs2_create(struct inode *dir, struct dentry *dentry,
812 umode_t mode, bool excl)
813 {
814 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
815 }
816
817 /**
818 * __gfs2_lookup - Look up a filename in a directory and return its inode
819 * @dir: The directory inode
820 * @dentry: The dentry of the new inode
821 * @file: File to be opened
822 * @opened: atomic_open flags
823 *
824 *
825 * Returns: errno
826 */
827
828 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
829 struct file *file, int *opened)
830 {
831 struct inode *inode;
832 struct dentry *d;
833 struct gfs2_holder gh;
834 struct gfs2_glock *gl;
835 int error;
836
837 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
838 if (inode == NULL) {
839 d_add(dentry, NULL);
840 return NULL;
841 }
842 if (IS_ERR(inode))
843 return ERR_CAST(inode);
844
845 gl = GFS2_I(inode)->i_gl;
846 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
847 if (error) {
848 iput(inode);
849 return ERR_PTR(error);
850 }
851
852 d = d_splice_alias(inode, dentry);
853 if (IS_ERR(d)) {
854 gfs2_glock_dq_uninit(&gh);
855 return d;
856 }
857 if (file && S_ISREG(inode->i_mode))
858 error = finish_open(file, dentry, gfs2_open_common, opened);
859
860 gfs2_glock_dq_uninit(&gh);
861 if (error) {
862 dput(d);
863 return ERR_PTR(error);
864 }
865 return d;
866 }
867
868 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
869 unsigned flags)
870 {
871 return __gfs2_lookup(dir, dentry, NULL, NULL);
872 }
873
874 /**
875 * gfs2_link - Link to a file
876 * @old_dentry: The inode to link
877 * @dir: Add link to this directory
878 * @dentry: The name of the link
879 *
880 * Link the inode in "old_dentry" into the directory "dir" with the
881 * name in "dentry".
882 *
883 * Returns: errno
884 */
885
886 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
887 struct dentry *dentry)
888 {
889 struct gfs2_inode *dip = GFS2_I(dir);
890 struct gfs2_sbd *sdp = GFS2_SB(dir);
891 struct inode *inode = d_inode(old_dentry);
892 struct gfs2_inode *ip = GFS2_I(inode);
893 struct gfs2_holder ghs[2];
894 struct buffer_head *dibh;
895 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
896 int error;
897
898 if (S_ISDIR(inode->i_mode))
899 return -EPERM;
900
901 error = gfs2_rs_alloc(dip);
902 if (error)
903 return error;
904
905 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
906 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
907
908 error = gfs2_glock_nq(ghs); /* parent */
909 if (error)
910 goto out_parent;
911
912 error = gfs2_glock_nq(ghs + 1); /* child */
913 if (error)
914 goto out_child;
915
916 error = -ENOENT;
917 if (inode->i_nlink == 0)
918 goto out_gunlock;
919
920 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
921 if (error)
922 goto out_gunlock;
923
924 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
925 switch (error) {
926 case -ENOENT:
927 break;
928 case 0:
929 error = -EEXIST;
930 default:
931 goto out_gunlock;
932 }
933
934 error = -EINVAL;
935 if (!dip->i_inode.i_nlink)
936 goto out_gunlock;
937 error = -EFBIG;
938 if (dip->i_entries == (u32)-1)
939 goto out_gunlock;
940 error = -EPERM;
941 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
942 goto out_gunlock;
943 error = -EINVAL;
944 if (!ip->i_inode.i_nlink)
945 goto out_gunlock;
946 error = -EMLINK;
947 if (ip->i_inode.i_nlink == (u32)-1)
948 goto out_gunlock;
949
950 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
951 if (error < 0)
952 goto out_gunlock;
953
954 if (da.nr_blocks) {
955 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
956 error = gfs2_quota_lock_check(dip, &ap);
957 if (error)
958 goto out_gunlock;
959
960 error = gfs2_inplace_reserve(dip, &ap);
961 if (error)
962 goto out_gunlock_q;
963
964 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
965 if (error)
966 goto out_ipres;
967 } else {
968 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
969 if (error)
970 goto out_ipres;
971 }
972
973 error = gfs2_meta_inode_buffer(ip, &dibh);
974 if (error)
975 goto out_end_trans;
976
977 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
978 if (error)
979 goto out_brelse;
980
981 gfs2_trans_add_meta(ip->i_gl, dibh);
982 inc_nlink(&ip->i_inode);
983 ip->i_inode.i_ctime = CURRENT_TIME;
984 ihold(inode);
985 d_instantiate(dentry, inode);
986 mark_inode_dirty(inode);
987
988 out_brelse:
989 brelse(dibh);
990 out_end_trans:
991 gfs2_trans_end(sdp);
992 out_ipres:
993 if (da.nr_blocks)
994 gfs2_inplace_release(dip);
995 out_gunlock_q:
996 if (da.nr_blocks)
997 gfs2_quota_unlock(dip);
998 out_gunlock:
999 gfs2_dir_no_add(&da);
1000 gfs2_glock_dq(ghs + 1);
1001 out_child:
1002 gfs2_glock_dq(ghs);
1003 out_parent:
1004 gfs2_holder_uninit(ghs);
1005 gfs2_holder_uninit(ghs + 1);
1006 return error;
1007 }
1008
1009 /*
1010 * gfs2_unlink_ok - check to see that a inode is still in a directory
1011 * @dip: the directory
1012 * @name: the name of the file
1013 * @ip: the inode
1014 *
1015 * Assumes that the lock on (at least) @dip is held.
1016 *
1017 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1018 */
1019
1020 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1021 const struct gfs2_inode *ip)
1022 {
1023 int error;
1024
1025 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1026 return -EPERM;
1027
1028 if ((dip->i_inode.i_mode & S_ISVTX) &&
1029 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1030 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1031 return -EPERM;
1032
1033 if (IS_APPEND(&dip->i_inode))
1034 return -EPERM;
1035
1036 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1037 if (error)
1038 return error;
1039
1040 return gfs2_dir_check(&dip->i_inode, name, ip);
1041 }
1042
1043 /**
1044 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1045 * @dip: The parent directory
1046 * @name: The name of the entry in the parent directory
1047 * @inode: The inode to be removed
1048 *
1049 * Called with all the locks and in a transaction. This will only be
1050 * called for a directory after it has been checked to ensure it is empty.
1051 *
1052 * Returns: 0 on success, or an error
1053 */
1054
1055 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1056 const struct dentry *dentry)
1057 {
1058 struct inode *inode = d_inode(dentry);
1059 struct gfs2_inode *ip = GFS2_I(inode);
1060 int error;
1061
1062 error = gfs2_dir_del(dip, dentry);
1063 if (error)
1064 return error;
1065
1066 ip->i_entries = 0;
1067 inode->i_ctime = CURRENT_TIME;
1068 if (S_ISDIR(inode->i_mode))
1069 clear_nlink(inode);
1070 else
1071 drop_nlink(inode);
1072 mark_inode_dirty(inode);
1073 if (inode->i_nlink == 0)
1074 gfs2_unlink_di(inode);
1075 return 0;
1076 }
1077
1078
1079 /**
1080 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1081 * @dir: The inode of the directory containing the inode to unlink
1082 * @dentry: The file itself
1083 *
1084 * This routine uses the type of the inode as a flag to figure out
1085 * whether this is an unlink or an rmdir.
1086 *
1087 * Returns: errno
1088 */
1089
1090 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1091 {
1092 struct gfs2_inode *dip = GFS2_I(dir);
1093 struct gfs2_sbd *sdp = GFS2_SB(dir);
1094 struct inode *inode = d_inode(dentry);
1095 struct gfs2_inode *ip = GFS2_I(inode);
1096 struct gfs2_holder ghs[3];
1097 struct gfs2_rgrpd *rgd;
1098 int error;
1099
1100 error = gfs2_rindex_update(sdp);
1101 if (error)
1102 return error;
1103
1104 error = -EROFS;
1105
1106 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1107 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1108
1109 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1110 if (!rgd)
1111 goto out_inodes;
1112
1113 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1114
1115
1116 error = gfs2_glock_nq(ghs); /* parent */
1117 if (error)
1118 goto out_parent;
1119
1120 error = gfs2_glock_nq(ghs + 1); /* child */
1121 if (error)
1122 goto out_child;
1123
1124 error = -ENOENT;
1125 if (inode->i_nlink == 0)
1126 goto out_rgrp;
1127
1128 if (S_ISDIR(inode->i_mode)) {
1129 error = -ENOTEMPTY;
1130 if (ip->i_entries > 2 || inode->i_nlink > 2)
1131 goto out_rgrp;
1132 }
1133
1134 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1135 if (error)
1136 goto out_rgrp;
1137
1138 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1139 if (error)
1140 goto out_gunlock;
1141
1142 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1143 if (error)
1144 goto out_end_trans;
1145
1146 error = gfs2_unlink_inode(dip, dentry);
1147
1148 out_end_trans:
1149 gfs2_trans_end(sdp);
1150 out_gunlock:
1151 gfs2_glock_dq(ghs + 2);
1152 out_rgrp:
1153 gfs2_glock_dq(ghs + 1);
1154 out_child:
1155 gfs2_glock_dq(ghs);
1156 out_parent:
1157 gfs2_holder_uninit(ghs + 2);
1158 out_inodes:
1159 gfs2_holder_uninit(ghs + 1);
1160 gfs2_holder_uninit(ghs);
1161 return error;
1162 }
1163
1164 /**
1165 * gfs2_symlink - Create a symlink
1166 * @dir: The directory to create the symlink in
1167 * @dentry: The dentry to put the symlink in
1168 * @symname: The thing which the link points to
1169 *
1170 * Returns: errno
1171 */
1172
1173 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1174 const char *symname)
1175 {
1176 struct gfs2_sbd *sdp = GFS2_SB(dir);
1177 unsigned int size;
1178
1179 size = strlen(symname);
1180 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1181 return -ENAMETOOLONG;
1182
1183 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1184 }
1185
1186 /**
1187 * gfs2_mkdir - Make a directory
1188 * @dir: The parent directory of the new one
1189 * @dentry: The dentry of the new directory
1190 * @mode: The mode of the new directory
1191 *
1192 * Returns: errno
1193 */
1194
1195 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1196 {
1197 struct gfs2_sbd *sdp = GFS2_SB(dir);
1198 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1199 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1200 }
1201
1202 /**
1203 * gfs2_mknod - Make a special file
1204 * @dir: The directory in which the special file will reside
1205 * @dentry: The dentry of the special file
1206 * @mode: The mode of the special file
1207 * @dev: The device specification of the special file
1208 *
1209 */
1210
1211 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1212 dev_t dev)
1213 {
1214 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1215 }
1216
1217 /**
1218 * gfs2_atomic_open - Atomically open a file
1219 * @dir: The directory
1220 * @dentry: The proposed new entry
1221 * @file: The proposed new struct file
1222 * @flags: open flags
1223 * @mode: File mode
1224 * @opened: Flag to say whether the file has been opened or not
1225 *
1226 * Returns: error code or 0 for success
1227 */
1228
1229 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1230 struct file *file, unsigned flags,
1231 umode_t mode, int *opened)
1232 {
1233 struct dentry *d;
1234 bool excl = !!(flags & O_EXCL);
1235
1236 if (!d_unhashed(dentry))
1237 goto skip_lookup;
1238
1239 d = __gfs2_lookup(dir, dentry, file, opened);
1240 if (IS_ERR(d))
1241 return PTR_ERR(d);
1242 if (d != NULL)
1243 dentry = d;
1244 if (d_really_is_positive(dentry)) {
1245 if (!(*opened & FILE_OPENED))
1246 return finish_no_open(file, d);
1247 dput(d);
1248 return 0;
1249 }
1250
1251 BUG_ON(d != NULL);
1252
1253 skip_lookup:
1254 if (!(flags & O_CREAT))
1255 return -ENOENT;
1256
1257 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1258 }
1259
1260 /*
1261 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1262 * @this: move this
1263 * @to: to here
1264 *
1265 * Follow @to back to the root and make sure we don't encounter @this
1266 * Assumes we already hold the rename lock.
1267 *
1268 * Returns: errno
1269 */
1270
1271 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1272 {
1273 struct inode *dir = &to->i_inode;
1274 struct super_block *sb = dir->i_sb;
1275 struct inode *tmp;
1276 int error = 0;
1277
1278 igrab(dir);
1279
1280 for (;;) {
1281 if (dir == &this->i_inode) {
1282 error = -EINVAL;
1283 break;
1284 }
1285 if (dir == d_inode(sb->s_root)) {
1286 error = 0;
1287 break;
1288 }
1289
1290 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1291 if (!tmp) {
1292 error = -ENOENT;
1293 break;
1294 }
1295 if (IS_ERR(tmp)) {
1296 error = PTR_ERR(tmp);
1297 break;
1298 }
1299
1300 iput(dir);
1301 dir = tmp;
1302 }
1303
1304 iput(dir);
1305
1306 return error;
1307 }
1308
1309 /**
1310 * gfs2_rename - Rename a file
1311 * @odir: Parent directory of old file name
1312 * @odentry: The old dentry of the file
1313 * @ndir: Parent directory of new file name
1314 * @ndentry: The new dentry of the file
1315 *
1316 * Returns: errno
1317 */
1318
1319 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1320 struct inode *ndir, struct dentry *ndentry)
1321 {
1322 struct gfs2_inode *odip = GFS2_I(odir);
1323 struct gfs2_inode *ndip = GFS2_I(ndir);
1324 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1325 struct gfs2_inode *nip = NULL;
1326 struct gfs2_sbd *sdp = GFS2_SB(odir);
1327 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1328 struct gfs2_rgrpd *nrgd;
1329 unsigned int num_gh;
1330 int dir_rename = 0;
1331 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1332 unsigned int x;
1333 int error;
1334
1335 if (d_really_is_positive(ndentry)) {
1336 nip = GFS2_I(d_inode(ndentry));
1337 if (ip == nip)
1338 return 0;
1339 }
1340
1341 error = gfs2_rindex_update(sdp);
1342 if (error)
1343 return error;
1344
1345 error = gfs2_rs_alloc(ndip);
1346 if (error)
1347 return error;
1348
1349 if (odip != ndip) {
1350 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1351 0, &r_gh);
1352 if (error)
1353 goto out;
1354
1355 if (S_ISDIR(ip->i_inode.i_mode)) {
1356 dir_rename = 1;
1357 /* don't move a dirctory into it's subdir */
1358 error = gfs2_ok_to_move(ip, ndip);
1359 if (error)
1360 goto out_gunlock_r;
1361 }
1362 }
1363
1364 num_gh = 1;
1365 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1366 if (odip != ndip) {
1367 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1368 num_gh++;
1369 }
1370 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1371 num_gh++;
1372
1373 if (nip) {
1374 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1375 num_gh++;
1376 /* grab the resource lock for unlink flag twiddling
1377 * this is the case of the target file already existing
1378 * so we unlink before doing the rename
1379 */
1380 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1381 if (nrgd)
1382 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1383 }
1384
1385 for (x = 0; x < num_gh; x++) {
1386 error = gfs2_glock_nq(ghs + x);
1387 if (error)
1388 goto out_gunlock;
1389 }
1390
1391 error = -ENOENT;
1392 if (ip->i_inode.i_nlink == 0)
1393 goto out_gunlock;
1394
1395 /* Check out the old directory */
1396
1397 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1398 if (error)
1399 goto out_gunlock;
1400
1401 /* Check out the new directory */
1402
1403 if (nip) {
1404 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1405 if (error)
1406 goto out_gunlock;
1407
1408 if (nip->i_inode.i_nlink == 0) {
1409 error = -EAGAIN;
1410 goto out_gunlock;
1411 }
1412
1413 if (S_ISDIR(nip->i_inode.i_mode)) {
1414 if (nip->i_entries < 2) {
1415 gfs2_consist_inode(nip);
1416 error = -EIO;
1417 goto out_gunlock;
1418 }
1419 if (nip->i_entries > 2) {
1420 error = -ENOTEMPTY;
1421 goto out_gunlock;
1422 }
1423 }
1424 } else {
1425 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1426 if (error)
1427 goto out_gunlock;
1428
1429 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1430 switch (error) {
1431 case -ENOENT:
1432 error = 0;
1433 break;
1434 case 0:
1435 error = -EEXIST;
1436 default:
1437 goto out_gunlock;
1438 };
1439
1440 if (odip != ndip) {
1441 if (!ndip->i_inode.i_nlink) {
1442 error = -ENOENT;
1443 goto out_gunlock;
1444 }
1445 if (ndip->i_entries == (u32)-1) {
1446 error = -EFBIG;
1447 goto out_gunlock;
1448 }
1449 if (S_ISDIR(ip->i_inode.i_mode) &&
1450 ndip->i_inode.i_nlink == (u32)-1) {
1451 error = -EMLINK;
1452 goto out_gunlock;
1453 }
1454 }
1455 }
1456
1457 /* Check out the dir to be renamed */
1458
1459 if (dir_rename) {
1460 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1461 if (error)
1462 goto out_gunlock;
1463 }
1464
1465 if (nip == NULL) {
1466 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1467 if (error)
1468 goto out_gunlock;
1469 }
1470
1471 if (da.nr_blocks) {
1472 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1473 error = gfs2_quota_lock_check(ndip, &ap);
1474 if (error)
1475 goto out_gunlock;
1476
1477 error = gfs2_inplace_reserve(ndip, &ap);
1478 if (error)
1479 goto out_gunlock_q;
1480
1481 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1482 4 * RES_LEAF + 4, 0);
1483 if (error)
1484 goto out_ipreserv;
1485 } else {
1486 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1487 5 * RES_LEAF + 4, 0);
1488 if (error)
1489 goto out_gunlock;
1490 }
1491
1492 /* Remove the target file, if it exists */
1493
1494 if (nip)
1495 error = gfs2_unlink_inode(ndip, ndentry);
1496
1497 if (dir_rename) {
1498 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1499 if (error)
1500 goto out_end_trans;
1501 } else {
1502 struct buffer_head *dibh;
1503 error = gfs2_meta_inode_buffer(ip, &dibh);
1504 if (error)
1505 goto out_end_trans;
1506 ip->i_inode.i_ctime = CURRENT_TIME;
1507 gfs2_trans_add_meta(ip->i_gl, dibh);
1508 gfs2_dinode_out(ip, dibh->b_data);
1509 brelse(dibh);
1510 }
1511
1512 error = gfs2_dir_del(odip, odentry);
1513 if (error)
1514 goto out_end_trans;
1515
1516 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1517 if (error)
1518 goto out_end_trans;
1519
1520 out_end_trans:
1521 gfs2_trans_end(sdp);
1522 out_ipreserv:
1523 if (da.nr_blocks)
1524 gfs2_inplace_release(ndip);
1525 out_gunlock_q:
1526 if (da.nr_blocks)
1527 gfs2_quota_unlock(ndip);
1528 out_gunlock:
1529 gfs2_dir_no_add(&da);
1530 while (x--) {
1531 gfs2_glock_dq(ghs + x);
1532 gfs2_holder_uninit(ghs + x);
1533 }
1534 out_gunlock_r:
1535 if (r_gh.gh_gl)
1536 gfs2_glock_dq_uninit(&r_gh);
1537 out:
1538 return error;
1539 }
1540
1541 /**
1542 * gfs2_follow_link - Follow a symbolic link
1543 * @dentry: The dentry of the link
1544 * @nd: Data that we pass to vfs_follow_link()
1545 *
1546 * This can handle symlinks of any size.
1547 *
1548 * Returns: 0 on success or error code
1549 */
1550
1551 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1552 {
1553 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
1554 struct gfs2_holder i_gh;
1555 struct buffer_head *dibh;
1556 unsigned int size;
1557 char *buf;
1558 int error;
1559
1560 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1561 error = gfs2_glock_nq(&i_gh);
1562 if (error) {
1563 gfs2_holder_uninit(&i_gh);
1564 nd_set_link(nd, ERR_PTR(error));
1565 return NULL;
1566 }
1567
1568 size = (unsigned int)i_size_read(&ip->i_inode);
1569 if (size == 0) {
1570 gfs2_consist_inode(ip);
1571 buf = ERR_PTR(-EIO);
1572 goto out;
1573 }
1574
1575 error = gfs2_meta_inode_buffer(ip, &dibh);
1576 if (error) {
1577 buf = ERR_PTR(error);
1578 goto out;
1579 }
1580
1581 buf = kzalloc(size + 1, GFP_NOFS);
1582 if (!buf)
1583 buf = ERR_PTR(-ENOMEM);
1584 else
1585 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1586 brelse(dibh);
1587 out:
1588 gfs2_glock_dq_uninit(&i_gh);
1589 nd_set_link(nd, buf);
1590 return NULL;
1591 }
1592
1593 /**
1594 * gfs2_permission -
1595 * @inode: The inode
1596 * @mask: The mask to be tested
1597 * @flags: Indicates whether this is an RCU path walk or not
1598 *
1599 * This may be called from the VFS directly, or from within GFS2 with the
1600 * inode locked, so we look to see if the glock is already locked and only
1601 * lock the glock if its not already been done.
1602 *
1603 * Returns: errno
1604 */
1605
1606 int gfs2_permission(struct inode *inode, int mask)
1607 {
1608 struct gfs2_inode *ip;
1609 struct gfs2_holder i_gh;
1610 int error;
1611 int unlock = 0;
1612
1613
1614 ip = GFS2_I(inode);
1615 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1616 if (mask & MAY_NOT_BLOCK)
1617 return -ECHILD;
1618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1619 if (error)
1620 return error;
1621 unlock = 1;
1622 }
1623
1624 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1625 error = -EACCES;
1626 else
1627 error = generic_permission(inode, mask);
1628 if (unlock)
1629 gfs2_glock_dq_uninit(&i_gh);
1630
1631 return error;
1632 }
1633
1634 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1635 {
1636 setattr_copy(inode, attr);
1637 mark_inode_dirty(inode);
1638 return 0;
1639 }
1640
1641 /**
1642 * gfs2_setattr_simple -
1643 * @ip:
1644 * @attr:
1645 *
1646 * Returns: errno
1647 */
1648
1649 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1650 {
1651 int error;
1652
1653 if (current->journal_info)
1654 return __gfs2_setattr_simple(inode, attr);
1655
1656 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1657 if (error)
1658 return error;
1659
1660 error = __gfs2_setattr_simple(inode, attr);
1661 gfs2_trans_end(GFS2_SB(inode));
1662 return error;
1663 }
1664
1665 static int setattr_chown(struct inode *inode, struct iattr *attr)
1666 {
1667 struct gfs2_inode *ip = GFS2_I(inode);
1668 struct gfs2_sbd *sdp = GFS2_SB(inode);
1669 kuid_t ouid, nuid;
1670 kgid_t ogid, ngid;
1671 int error;
1672 struct gfs2_alloc_parms ap;
1673
1674 ouid = inode->i_uid;
1675 ogid = inode->i_gid;
1676 nuid = attr->ia_uid;
1677 ngid = attr->ia_gid;
1678
1679 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1680 ouid = nuid = NO_UID_QUOTA_CHANGE;
1681 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1682 ogid = ngid = NO_GID_QUOTA_CHANGE;
1683
1684 error = get_write_access(inode);
1685 if (error)
1686 return error;
1687
1688 error = gfs2_rs_alloc(ip);
1689 if (error)
1690 goto out;
1691
1692 error = gfs2_rindex_update(sdp);
1693 if (error)
1694 goto out;
1695
1696 error = gfs2_quota_lock(ip, nuid, ngid);
1697 if (error)
1698 goto out;
1699
1700 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
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, &ap);
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 gfs2_quota_change(ip, -ap.target, ouid, ogid);
1720 gfs2_quota_change(ip, ap.target, nuid, ngid);
1721 }
1722
1723 out_end_trans:
1724 gfs2_trans_end(sdp);
1725 out_gunlock_q:
1726 gfs2_quota_unlock(ip);
1727 out:
1728 put_write_access(inode);
1729 return error;
1730 }
1731
1732 /**
1733 * gfs2_setattr - Change attributes on an inode
1734 * @dentry: The dentry which is changing
1735 * @attr: The structure describing the change
1736 *
1737 * The VFS layer wants to change one or more of an inodes attributes. Write
1738 * that change out to disk.
1739 *
1740 * Returns: errno
1741 */
1742
1743 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1744 {
1745 struct inode *inode = d_inode(dentry);
1746 struct gfs2_inode *ip = GFS2_I(inode);
1747 struct gfs2_holder i_gh;
1748 int error;
1749
1750 error = gfs2_rs_alloc(ip);
1751 if (error)
1752 return error;
1753
1754 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1755 if (error)
1756 return error;
1757
1758 error = -EPERM;
1759 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1760 goto out;
1761
1762 error = setattr_prepare(dentry, attr);
1763 if (error)
1764 goto out;
1765
1766 if (attr->ia_valid & ATTR_SIZE)
1767 error = gfs2_setattr_size(inode, attr->ia_size);
1768 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1769 error = setattr_chown(inode, attr);
1770 else {
1771 error = gfs2_setattr_simple(inode, attr);
1772 if (!error && attr->ia_valid & ATTR_MODE)
1773 error = posix_acl_chmod(inode, inode->i_mode);
1774 }
1775
1776 out:
1777 if (!error)
1778 mark_inode_dirty(inode);
1779 gfs2_glock_dq_uninit(&i_gh);
1780 return error;
1781 }
1782
1783 /**
1784 * gfs2_getattr - Read out an inode's attributes
1785 * @mnt: The vfsmount the inode is being accessed from
1786 * @dentry: The dentry to stat
1787 * @stat: The inode's stats
1788 *
1789 * This may be called from the VFS directly, or from within GFS2 with the
1790 * inode locked, so we look to see if the glock is already locked and only
1791 * lock the glock if its not already been done. Note that its the NFS
1792 * readdirplus operation which causes this to be called (from filldir)
1793 * with the glock already held.
1794 *
1795 * Returns: errno
1796 */
1797
1798 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1799 struct kstat *stat)
1800 {
1801 struct inode *inode = d_inode(dentry);
1802 struct gfs2_inode *ip = GFS2_I(inode);
1803 struct gfs2_holder gh;
1804 int error;
1805 int unlock = 0;
1806
1807 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1808 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1809 if (error)
1810 return error;
1811 unlock = 1;
1812 }
1813
1814 generic_fillattr(inode, stat);
1815 if (unlock)
1816 gfs2_glock_dq_uninit(&gh);
1817
1818 return 0;
1819 }
1820
1821 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1822 const void *data, size_t size, int flags)
1823 {
1824 struct inode *inode = d_inode(dentry);
1825 struct gfs2_inode *ip = GFS2_I(inode);
1826 struct gfs2_holder gh;
1827 int ret;
1828
1829 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1830 ret = gfs2_glock_nq(&gh);
1831 if (ret == 0) {
1832 ret = gfs2_rs_alloc(ip);
1833 if (ret == 0)
1834 ret = generic_setxattr(dentry, name, data, size, flags);
1835 gfs2_glock_dq(&gh);
1836 }
1837 gfs2_holder_uninit(&gh);
1838 return ret;
1839 }
1840
1841 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1842 void *data, size_t size)
1843 {
1844 struct inode *inode = d_inode(dentry);
1845 struct gfs2_inode *ip = GFS2_I(inode);
1846 struct gfs2_holder gh;
1847 int ret;
1848
1849 /* For selinux during lookup */
1850 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1851 return generic_getxattr(dentry, name, data, size);
1852
1853 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1854 ret = gfs2_glock_nq(&gh);
1855 if (ret == 0) {
1856 ret = generic_getxattr(dentry, name, data, size);
1857 gfs2_glock_dq(&gh);
1858 }
1859 gfs2_holder_uninit(&gh);
1860 return ret;
1861 }
1862
1863 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1864 {
1865 struct inode *inode = d_inode(dentry);
1866 struct gfs2_inode *ip = GFS2_I(inode);
1867 struct gfs2_holder gh;
1868 int ret;
1869
1870 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1871 ret = gfs2_glock_nq(&gh);
1872 if (ret == 0) {
1873 ret = gfs2_rs_alloc(ip);
1874 if (ret == 0)
1875 ret = generic_removexattr(dentry, name);
1876 gfs2_glock_dq(&gh);
1877 }
1878 gfs2_holder_uninit(&gh);
1879 return ret;
1880 }
1881
1882 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1883 u64 start, u64 len)
1884 {
1885 struct gfs2_inode *ip = GFS2_I(inode);
1886 struct gfs2_holder gh;
1887 int ret;
1888
1889 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1890 if (ret)
1891 return ret;
1892
1893 mutex_lock(&inode->i_mutex);
1894
1895 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1896 if (ret)
1897 goto out;
1898
1899 if (gfs2_is_stuffed(ip)) {
1900 u64 phys = ip->i_no_addr << inode->i_blkbits;
1901 u64 size = i_size_read(inode);
1902 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1903 FIEMAP_EXTENT_DATA_INLINE;
1904 phys += sizeof(struct gfs2_dinode);
1905 phys += start;
1906 if (start + len > size)
1907 len = size - start;
1908 if (start < size)
1909 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1910 len, flags);
1911 if (ret == 1)
1912 ret = 0;
1913 } else {
1914 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1915 gfs2_block_map);
1916 }
1917
1918 gfs2_glock_dq_uninit(&gh);
1919 out:
1920 mutex_unlock(&inode->i_mutex);
1921 return ret;
1922 }
1923
1924 const struct inode_operations gfs2_file_iops = {
1925 .permission = gfs2_permission,
1926 .setattr = gfs2_setattr,
1927 .getattr = gfs2_getattr,
1928 .setxattr = gfs2_setxattr,
1929 .getxattr = gfs2_getxattr,
1930 .listxattr = gfs2_listxattr,
1931 .removexattr = gfs2_removexattr,
1932 .fiemap = gfs2_fiemap,
1933 .get_acl = gfs2_get_acl,
1934 .set_acl = gfs2_set_acl,
1935 };
1936
1937 const struct inode_operations gfs2_dir_iops = {
1938 .create = gfs2_create,
1939 .lookup = gfs2_lookup,
1940 .link = gfs2_link,
1941 .unlink = gfs2_unlink,
1942 .symlink = gfs2_symlink,
1943 .mkdir = gfs2_mkdir,
1944 .rmdir = gfs2_unlink,
1945 .mknod = gfs2_mknod,
1946 .rename = gfs2_rename,
1947 .permission = gfs2_permission,
1948 .setattr = gfs2_setattr,
1949 .getattr = gfs2_getattr,
1950 .setxattr = gfs2_setxattr,
1951 .getxattr = gfs2_getxattr,
1952 .listxattr = gfs2_listxattr,
1953 .removexattr = gfs2_removexattr,
1954 .fiemap = gfs2_fiemap,
1955 .get_acl = gfs2_get_acl,
1956 .set_acl = gfs2_set_acl,
1957 .atomic_open = gfs2_atomic_open,
1958 };
1959
1960 const struct inode_operations gfs2_symlink_iops = {
1961 .readlink = generic_readlink,
1962 .follow_link = gfs2_follow_link,
1963 .put_link = kfree_put_link,
1964 .permission = gfs2_permission,
1965 .setattr = gfs2_setattr,
1966 .getattr = gfs2_getattr,
1967 .setxattr = gfs2_setxattr,
1968 .getxattr = gfs2_getxattr,
1969 .listxattr = gfs2_listxattr,
1970 .removexattr = gfs2_removexattr,
1971 .fiemap = gfs2_fiemap,
1972 };
1973
Linux with added FPC-III support