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Merge branch 'drm-vmwgfx-fixes' of git://people.freedesktop.org/~syeh/repos_linux...
[deliverable/linux.git] / fs / gfs2 / inode.c
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 inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
41 {
42 return ilookup(sb, (unsigned long)no_addr);
43 }
44
45 /**
46 * gfs2_set_iop - Sets inode operations
47 * @inode: The inode with correct i_mode filled in
48 *
49 * GFS2 lookup code fills in vfs inode contents based on info obtained
50 * from directory entry inside gfs2_inode_lookup().
51 */
52
53 static void gfs2_set_iop(struct inode *inode)
54 {
55 struct gfs2_sbd *sdp = GFS2_SB(inode);
56 umode_t mode = inode->i_mode;
57
58 if (S_ISREG(mode)) {
59 inode->i_op = &gfs2_file_iops;
60 if (gfs2_localflocks(sdp))
61 inode->i_fop = &gfs2_file_fops_nolock;
62 else
63 inode->i_fop = &gfs2_file_fops;
64 } else if (S_ISDIR(mode)) {
65 inode->i_op = &gfs2_dir_iops;
66 if (gfs2_localflocks(sdp))
67 inode->i_fop = &gfs2_dir_fops_nolock;
68 else
69 inode->i_fop = &gfs2_dir_fops;
70 } else if (S_ISLNK(mode)) {
71 inode->i_op = &gfs2_symlink_iops;
72 } else {
73 inode->i_op = &gfs2_file_iops;
74 init_special_inode(inode, inode->i_mode, inode->i_rdev);
75 }
76 }
77
78 /**
79 * gfs2_inode_lookup - Lookup an inode
80 * @sb: The super block
81 * @no_addr: The inode number
82 * @type: The type of the inode
83 *
84 * Returns: A VFS inode, or an error
85 */
86
87 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
88 u64 no_addr, u64 no_formal_ino)
89 {
90 struct inode *inode;
91 struct gfs2_inode *ip;
92 struct gfs2_glock *io_gl = NULL;
93 int error;
94
95 inode = iget_locked(sb, (unsigned long)no_addr);
96 if (!inode)
97 return ERR_PTR(-ENOMEM);
98
99 ip = GFS2_I(inode);
100 ip->i_no_addr = no_addr;
101
102 if (inode->i_state & I_NEW) {
103 struct gfs2_sbd *sdp = GFS2_SB(inode);
104 ip->i_no_formal_ino = no_formal_ino;
105
106 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
107 if (unlikely(error))
108 goto fail;
109 ip->i_gl->gl_object = ip;
110
111 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
112 if (unlikely(error))
113 goto fail_put;
114
115 set_bit(GIF_INVALID, &ip->i_flags);
116 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
117 if (unlikely(error))
118 goto fail_iopen;
119
120 ip->i_iopen_gh.gh_gl->gl_object = ip;
121 gfs2_glock_put(io_gl);
122 io_gl = NULL;
123
124 if (type == DT_UNKNOWN) {
125 /* Inode glock must be locked already */
126 error = gfs2_inode_refresh(GFS2_I(inode));
127 if (error)
128 goto fail_refresh;
129 } else {
130 inode->i_mode = DT2IF(type);
131 }
132
133 gfs2_set_iop(inode);
134 unlock_new_inode(inode);
135 }
136
137 return inode;
138
139 fail_refresh:
140 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
141 ip->i_iopen_gh.gh_gl->gl_object = NULL;
142 gfs2_glock_dq_wait(&ip->i_iopen_gh);
143 gfs2_holder_uninit(&ip->i_iopen_gh);
144 fail_iopen:
145 if (io_gl)
146 gfs2_glock_put(io_gl);
147 fail_put:
148 ip->i_gl->gl_object = NULL;
149 fail:
150 iget_failed(inode);
151 return ERR_PTR(error);
152 }
153
154 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
155 u64 *no_formal_ino, unsigned int blktype)
156 {
157 struct super_block *sb = sdp->sd_vfs;
158 struct gfs2_holder i_gh;
159 struct inode *inode = NULL;
160 int error;
161
162 /* Must not read in block until block type is verified */
163 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
164 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
165 if (error)
166 return ERR_PTR(error);
167
168 error = gfs2_check_blk_type(sdp, no_addr, blktype);
169 if (error)
170 goto fail;
171
172 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0);
173 if (IS_ERR(inode))
174 goto fail;
175
176 /* Two extra checks for NFS only */
177 if (no_formal_ino) {
178 error = -ESTALE;
179 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
180 goto fail_iput;
181
182 error = -EIO;
183 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
184 goto fail_iput;
185
186 error = 0;
187 }
188
189 fail:
190 gfs2_glock_dq_uninit(&i_gh);
191 return error ? ERR_PTR(error) : inode;
192 fail_iput:
193 iput(inode);
194 goto fail;
195 }
196
197
198 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
199 {
200 struct qstr qstr;
201 struct inode *inode;
202 gfs2_str2qstr(&qstr, name);
203 inode = gfs2_lookupi(dip, &qstr, 1);
204 /* gfs2_lookupi has inconsistent callers: vfs
205 * related routines expect NULL for no entry found,
206 * gfs2_lookup_simple callers expect ENOENT
207 * and do not check for NULL.
208 */
209 if (inode == NULL)
210 return ERR_PTR(-ENOENT);
211 else
212 return inode;
213 }
214
215
216 /**
217 * gfs2_lookupi - Look up a filename in a directory and return its inode
218 * @d_gh: An initialized holder for the directory glock
219 * @name: The name of the inode to look for
220 * @is_root: If 1, ignore the caller's permissions
221 * @i_gh: An uninitialized holder for the new inode glock
222 *
223 * This can be called via the VFS filldir function when NFS is doing
224 * a readdirplus and the inode which its intending to stat isn't
225 * already in cache. In this case we must not take the directory glock
226 * again, since the readdir call will have already taken that lock.
227 *
228 * Returns: errno
229 */
230
231 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
232 int is_root)
233 {
234 struct super_block *sb = dir->i_sb;
235 struct gfs2_inode *dip = GFS2_I(dir);
236 struct gfs2_holder d_gh;
237 int error = 0;
238 struct inode *inode = NULL;
239 int unlock = 0;
240
241 if (!name->len || name->len > GFS2_FNAMESIZE)
242 return ERR_PTR(-ENAMETOOLONG);
243
244 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
245 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
246 dir == d_inode(sb->s_root))) {
247 igrab(dir);
248 return dir;
249 }
250
251 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
252 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
253 if (error)
254 return ERR_PTR(error);
255 unlock = 1;
256 }
257
258 if (!is_root) {
259 error = gfs2_permission(dir, MAY_EXEC);
260 if (error)
261 goto out;
262 }
263
264 inode = gfs2_dir_search(dir, name, false);
265 if (IS_ERR(inode))
266 error = PTR_ERR(inode);
267 out:
268 if (unlock)
269 gfs2_glock_dq_uninit(&d_gh);
270 if (error == -ENOENT)
271 return NULL;
272 return inode ? inode : ERR_PTR(error);
273 }
274
275 /**
276 * create_ok - OK to create a new on-disk inode here?
277 * @dip: Directory in which dinode is to be created
278 * @name: Name of new dinode
279 * @mode:
280 *
281 * Returns: errno
282 */
283
284 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
285 umode_t mode)
286 {
287 int error;
288
289 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
290 if (error)
291 return error;
292
293 /* Don't create entries in an unlinked directory */
294 if (!dip->i_inode.i_nlink)
295 return -ENOENT;
296
297 if (dip->i_entries == (u32)-1)
298 return -EFBIG;
299 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
300 return -EMLINK;
301
302 return 0;
303 }
304
305 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
306 struct inode *inode)
307 {
308 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
309 (dip->i_inode.i_mode & S_ISUID) &&
310 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
311 if (S_ISDIR(inode->i_mode))
312 inode->i_mode |= S_ISUID;
313 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
314 inode->i_mode &= ~07111;
315 inode->i_uid = dip->i_inode.i_uid;
316 } else
317 inode->i_uid = current_fsuid();
318
319 if (dip->i_inode.i_mode & S_ISGID) {
320 if (S_ISDIR(inode->i_mode))
321 inode->i_mode |= S_ISGID;
322 inode->i_gid = dip->i_inode.i_gid;
323 } else
324 inode->i_gid = current_fsgid();
325 }
326
327 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
328 {
329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
330 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
331 int error;
332
333 error = gfs2_quota_lock_check(ip, &ap);
334 if (error)
335 goto out;
336
337 error = gfs2_inplace_reserve(ip, &ap);
338 if (error)
339 goto out_quota;
340
341 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
342 if (error)
343 goto out_ipreserv;
344
345 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
346 ip->i_no_formal_ino = ip->i_generation;
347 ip->i_inode.i_ino = ip->i_no_addr;
348 ip->i_goal = ip->i_no_addr;
349
350 gfs2_trans_end(sdp);
351
352 out_ipreserv:
353 gfs2_inplace_release(ip);
354 out_quota:
355 gfs2_quota_unlock(ip);
356 out:
357 return error;
358 }
359
360 static void gfs2_init_dir(struct buffer_head *dibh,
361 const struct gfs2_inode *parent)
362 {
363 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
364 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
365
366 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
367 dent->de_inum = di->di_num; /* already GFS2 endian */
368 dent->de_type = cpu_to_be16(DT_DIR);
369
370 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
371 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
372 gfs2_inum_out(parent, dent);
373 dent->de_type = cpu_to_be16(DT_DIR);
374
375 }
376
377 /**
378 * gfs2_init_xattr - Initialise an xattr block for a new inode
379 * @ip: The inode in question
380 *
381 * This sets up an empty xattr block for a new inode, ready to
382 * take any ACLs, LSM xattrs, etc.
383 */
384
385 static void gfs2_init_xattr(struct gfs2_inode *ip)
386 {
387 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
388 struct buffer_head *bh;
389 struct gfs2_ea_header *ea;
390
391 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
392 gfs2_trans_add_meta(ip->i_gl, bh);
393 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
394 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
395
396 ea = GFS2_EA_BH2FIRST(bh);
397 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
398 ea->ea_type = GFS2_EATYPE_UNUSED;
399 ea->ea_flags = GFS2_EAFLAG_LAST;
400
401 brelse(bh);
402 }
403
404 /**
405 * init_dinode - Fill in a new dinode structure
406 * @dip: The directory this inode is being created in
407 * @ip: The inode
408 * @symname: The symlink destination (if a symlink)
409 * @bhp: The buffer head (returned to caller)
410 *
411 */
412
413 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
414 const char *symname)
415 {
416 struct gfs2_dinode *di;
417 struct buffer_head *dibh;
418
419 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
420 gfs2_trans_add_meta(ip->i_gl, dibh);
421 di = (struct gfs2_dinode *)dibh->b_data;
422 gfs2_dinode_out(ip, di);
423
424 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
425 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
426 di->__pad1 = 0;
427 di->__pad2 = 0;
428 di->__pad3 = 0;
429 memset(&di->__pad4, 0, sizeof(di->__pad4));
430 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
431 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
432
433 switch(ip->i_inode.i_mode & S_IFMT) {
434 case S_IFDIR:
435 gfs2_init_dir(dibh, dip);
436 break;
437 case S_IFLNK:
438 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
439 break;
440 }
441
442 set_buffer_uptodate(dibh);
443 brelse(dibh);
444 }
445
446 /**
447 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
448 * @dip: The directory we are linking into
449 * @da: The dir add information
450 * @nr_inodes: The number of inodes involved
451 *
452 * This calculate the number of blocks we need to reserve in a
453 * transaction to link @nr_inodes into a directory. In most cases
454 * @nr_inodes will be 2 (the directory plus the inode being linked in)
455 * but in case of rename, 4 may be required.
456 *
457 * Returns: Number of blocks
458 */
459
460 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
461 const struct gfs2_diradd *da,
462 unsigned nr_inodes)
463 {
464 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
465 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
466 }
467
468 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
469 struct gfs2_inode *ip, struct gfs2_diradd *da)
470 {
471 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
472 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
473 int error;
474
475 if (da->nr_blocks) {
476 error = gfs2_quota_lock_check(dip, &ap);
477 if (error)
478 goto fail_quota_locks;
479
480 error = gfs2_inplace_reserve(dip, &ap);
481 if (error)
482 goto fail_quota_locks;
483
484 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
485 if (error)
486 goto fail_ipreserv;
487 } else {
488 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
489 if (error)
490 goto fail_quota_locks;
491 }
492
493 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
494
495 gfs2_trans_end(sdp);
496 fail_ipreserv:
497 gfs2_inplace_release(dip);
498 fail_quota_locks:
499 gfs2_quota_unlock(dip);
500 return error;
501 }
502
503 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
504 void *fs_info)
505 {
506 const struct xattr *xattr;
507 int err = 0;
508
509 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
510 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
511 xattr->value_len, 0,
512 GFS2_EATYPE_SECURITY);
513 if (err < 0)
514 break;
515 }
516 return err;
517 }
518
519 /**
520 * gfs2_create_inode - Create a new inode
521 * @dir: The parent directory
522 * @dentry: The new dentry
523 * @file: If non-NULL, the file which is being opened
524 * @mode: The permissions on the new inode
525 * @dev: For device nodes, this is the device number
526 * @symname: For symlinks, this is the link destination
527 * @size: The initial size of the inode (ignored for directories)
528 *
529 * Returns: 0 on success, or error code
530 */
531
532 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
533 struct file *file,
534 umode_t mode, dev_t dev, const char *symname,
535 unsigned int size, int excl, int *opened)
536 {
537 const struct qstr *name = &dentry->d_name;
538 struct posix_acl *default_acl, *acl;
539 struct gfs2_holder ghs[2];
540 struct inode *inode = NULL;
541 struct gfs2_inode *dip = GFS2_I(dir), *ip;
542 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
543 struct gfs2_glock *io_gl = NULL;
544 int error, free_vfs_inode = 1;
545 u32 aflags = 0;
546 unsigned blocks = 1;
547 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
548
549 if (!name->len || name->len > GFS2_FNAMESIZE)
550 return -ENAMETOOLONG;
551
552 error = gfs2_rsqa_alloc(dip);
553 if (error)
554 return error;
555
556 error = gfs2_rindex_update(sdp);
557 if (error)
558 return error;
559
560 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
561 if (error)
562 goto fail;
563
564 error = create_ok(dip, name, mode);
565 if (error)
566 goto fail_gunlock;
567
568 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
569 error = PTR_ERR(inode);
570 if (!IS_ERR(inode)) {
571 if (S_ISDIR(inode->i_mode)) {
572 iput(inode);
573 inode = ERR_PTR(-EISDIR);
574 goto fail_gunlock;
575 }
576 d_instantiate(dentry, inode);
577 error = 0;
578 if (file) {
579 if (S_ISREG(inode->i_mode))
580 error = finish_open(file, dentry, gfs2_open_common, opened);
581 else
582 error = finish_no_open(file, NULL);
583 }
584 gfs2_glock_dq_uninit(ghs);
585 return error;
586 } else if (error != -ENOENT) {
587 goto fail_gunlock;
588 }
589
590 error = gfs2_diradd_alloc_required(dir, name, &da);
591 if (error < 0)
592 goto fail_gunlock;
593
594 inode = new_inode(sdp->sd_vfs);
595 error = -ENOMEM;
596 if (!inode)
597 goto fail_gunlock;
598
599 error = posix_acl_create(dir, &mode, &default_acl, &acl);
600 if (error)
601 goto fail_gunlock;
602
603 ip = GFS2_I(inode);
604 error = gfs2_rsqa_alloc(ip);
605 if (error)
606 goto fail_free_acls;
607
608 inode->i_mode = mode;
609 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
610 inode->i_rdev = dev;
611 inode->i_size = size;
612 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
613 gfs2_set_inode_blocks(inode, 1);
614 munge_mode_uid_gid(dip, inode);
615 check_and_update_goal(dip);
616 ip->i_goal = dip->i_goal;
617 ip->i_diskflags = 0;
618 ip->i_eattr = 0;
619 ip->i_height = 0;
620 ip->i_depth = 0;
621 ip->i_entries = 0;
622
623 switch(mode & S_IFMT) {
624 case S_IFREG:
625 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
626 gfs2_tune_get(sdp, gt_new_files_jdata))
627 ip->i_diskflags |= GFS2_DIF_JDATA;
628 gfs2_set_aops(inode);
629 break;
630 case S_IFDIR:
631 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
632 ip->i_diskflags |= GFS2_DIF_JDATA;
633 ip->i_entries = 2;
634 break;
635 }
636
637 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
638 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
639 ip->i_diskflags |= GFS2_DIF_SYSTEM;
640
641 gfs2_set_inode_flags(inode);
642
643 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
644 (dip->i_diskflags & GFS2_DIF_TOPDIR))
645 aflags |= GFS2_AF_ORLOV;
646
647 if (default_acl || acl)
648 blocks++;
649
650 error = alloc_dinode(ip, aflags, &blocks);
651 if (error)
652 goto fail_free_inode;
653
654 gfs2_set_inode_blocks(inode, blocks);
655
656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657 if (error)
658 goto fail_free_inode;
659
660 ip->i_gl->gl_object = ip;
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
662 if (error)
663 goto fail_free_inode;
664
665 error = gfs2_trans_begin(sdp, blocks, 0);
666 if (error)
667 goto fail_gunlock2;
668
669 if (blocks > 1) {
670 ip->i_eattr = ip->i_no_addr + 1;
671 gfs2_init_xattr(ip);
672 }
673 init_dinode(dip, ip, symname);
674 gfs2_trans_end(sdp);
675
676 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
677 if (error)
678 goto fail_gunlock2;
679
680 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
681
682 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
683 if (error)
684 goto fail_gunlock2;
685
686 ip->i_iopen_gh.gh_gl->gl_object = ip;
687 gfs2_glock_put(io_gl);
688 gfs2_set_iop(inode);
689 insert_inode_hash(inode);
690
691 free_vfs_inode = 0; /* After this point, the inode is no longer
692 considered free. Any failures need to undo
693 the gfs2 structures. */
694 if (default_acl) {
695 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
696 posix_acl_release(default_acl);
697 }
698 if (acl) {
699 if (!error)
700 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
701 posix_acl_release(acl);
702 }
703
704 if (error)
705 goto fail_gunlock3;
706
707 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
708 &gfs2_initxattrs, NULL);
709 if (error)
710 goto fail_gunlock3;
711
712 error = link_dinode(dip, name, ip, &da);
713 if (error)
714 goto fail_gunlock3;
715
716 mark_inode_dirty(inode);
717 d_instantiate(dentry, inode);
718 if (file) {
719 *opened |= FILE_CREATED;
720 error = finish_open(file, dentry, gfs2_open_common, opened);
721 }
722 gfs2_glock_dq_uninit(ghs);
723 gfs2_glock_dq_uninit(ghs + 1);
724 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
725 return error;
726
727 fail_gunlock3:
728 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
729 gfs2_glock_put(io_gl);
730 fail_gunlock2:
731 if (io_gl)
732 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
733 gfs2_glock_dq_uninit(ghs + 1);
734 fail_free_inode:
735 if (ip->i_gl)
736 gfs2_glock_put(ip->i_gl);
737 gfs2_rsqa_delete(ip, NULL);
738 fail_free_acls:
739 if (default_acl)
740 posix_acl_release(default_acl);
741 if (acl)
742 posix_acl_release(acl);
743 fail_gunlock:
744 gfs2_dir_no_add(&da);
745 gfs2_glock_dq_uninit(ghs);
746 if (inode && !IS_ERR(inode)) {
747 clear_nlink(inode);
748 if (!free_vfs_inode)
749 mark_inode_dirty(inode);
750 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
751 &GFS2_I(inode)->i_flags);
752 iput(inode);
753 }
754 fail:
755 return error;
756 }
757
758 /**
759 * gfs2_create - Create a file
760 * @dir: The directory in which to create the file
761 * @dentry: The dentry of the new file
762 * @mode: The mode of the new file
763 *
764 * Returns: errno
765 */
766
767 static int gfs2_create(struct inode *dir, struct dentry *dentry,
768 umode_t mode, bool excl)
769 {
770 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
771 }
772
773 /**
774 * __gfs2_lookup - Look up a filename in a directory and return its inode
775 * @dir: The directory inode
776 * @dentry: The dentry of the new inode
777 * @file: File to be opened
778 * @opened: atomic_open flags
779 *
780 *
781 * Returns: errno
782 */
783
784 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
785 struct file *file, int *opened)
786 {
787 struct inode *inode;
788 struct dentry *d;
789 struct gfs2_holder gh;
790 struct gfs2_glock *gl;
791 int error;
792
793 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
794 if (inode == NULL) {
795 d_add(dentry, NULL);
796 return NULL;
797 }
798 if (IS_ERR(inode))
799 return ERR_CAST(inode);
800
801 gl = GFS2_I(inode)->i_gl;
802 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
803 if (error) {
804 iput(inode);
805 return ERR_PTR(error);
806 }
807
808 d = d_splice_alias(inode, dentry);
809 if (IS_ERR(d)) {
810 gfs2_glock_dq_uninit(&gh);
811 return d;
812 }
813 if (file && S_ISREG(inode->i_mode))
814 error = finish_open(file, dentry, gfs2_open_common, opened);
815
816 gfs2_glock_dq_uninit(&gh);
817 if (error) {
818 dput(d);
819 return ERR_PTR(error);
820 }
821 return d;
822 }
823
824 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
825 unsigned flags)
826 {
827 return __gfs2_lookup(dir, dentry, NULL, NULL);
828 }
829
830 /**
831 * gfs2_link - Link to a file
832 * @old_dentry: The inode to link
833 * @dir: Add link to this directory
834 * @dentry: The name of the link
835 *
836 * Link the inode in "old_dentry" into the directory "dir" with the
837 * name in "dentry".
838 *
839 * Returns: errno
840 */
841
842 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
843 struct dentry *dentry)
844 {
845 struct gfs2_inode *dip = GFS2_I(dir);
846 struct gfs2_sbd *sdp = GFS2_SB(dir);
847 struct inode *inode = d_inode(old_dentry);
848 struct gfs2_inode *ip = GFS2_I(inode);
849 struct gfs2_holder ghs[2];
850 struct buffer_head *dibh;
851 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
852 int error;
853
854 if (S_ISDIR(inode->i_mode))
855 return -EPERM;
856
857 error = gfs2_rsqa_alloc(dip);
858 if (error)
859 return error;
860
861 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
862 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
863
864 error = gfs2_glock_nq(ghs); /* parent */
865 if (error)
866 goto out_parent;
867
868 error = gfs2_glock_nq(ghs + 1); /* child */
869 if (error)
870 goto out_child;
871
872 error = -ENOENT;
873 if (inode->i_nlink == 0)
874 goto out_gunlock;
875
876 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
877 if (error)
878 goto out_gunlock;
879
880 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
881 switch (error) {
882 case -ENOENT:
883 break;
884 case 0:
885 error = -EEXIST;
886 default:
887 goto out_gunlock;
888 }
889
890 error = -EINVAL;
891 if (!dip->i_inode.i_nlink)
892 goto out_gunlock;
893 error = -EFBIG;
894 if (dip->i_entries == (u32)-1)
895 goto out_gunlock;
896 error = -EPERM;
897 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
898 goto out_gunlock;
899 error = -EINVAL;
900 if (!ip->i_inode.i_nlink)
901 goto out_gunlock;
902 error = -EMLINK;
903 if (ip->i_inode.i_nlink == (u32)-1)
904 goto out_gunlock;
905
906 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
907 if (error < 0)
908 goto out_gunlock;
909
910 if (da.nr_blocks) {
911 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
912 error = gfs2_quota_lock_check(dip, &ap);
913 if (error)
914 goto out_gunlock;
915
916 error = gfs2_inplace_reserve(dip, &ap);
917 if (error)
918 goto out_gunlock_q;
919
920 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
921 if (error)
922 goto out_ipres;
923 } else {
924 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
925 if (error)
926 goto out_ipres;
927 }
928
929 error = gfs2_meta_inode_buffer(ip, &dibh);
930 if (error)
931 goto out_end_trans;
932
933 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
934 if (error)
935 goto out_brelse;
936
937 gfs2_trans_add_meta(ip->i_gl, dibh);
938 inc_nlink(&ip->i_inode);
939 ip->i_inode.i_ctime = CURRENT_TIME;
940 ihold(inode);
941 d_instantiate(dentry, inode);
942 mark_inode_dirty(inode);
943
944 out_brelse:
945 brelse(dibh);
946 out_end_trans:
947 gfs2_trans_end(sdp);
948 out_ipres:
949 if (da.nr_blocks)
950 gfs2_inplace_release(dip);
951 out_gunlock_q:
952 if (da.nr_blocks)
953 gfs2_quota_unlock(dip);
954 out_gunlock:
955 gfs2_dir_no_add(&da);
956 gfs2_glock_dq(ghs + 1);
957 out_child:
958 gfs2_glock_dq(ghs);
959 out_parent:
960 gfs2_holder_uninit(ghs);
961 gfs2_holder_uninit(ghs + 1);
962 return error;
963 }
964
965 /*
966 * gfs2_unlink_ok - check to see that a inode is still in a directory
967 * @dip: the directory
968 * @name: the name of the file
969 * @ip: the inode
970 *
971 * Assumes that the lock on (at least) @dip is held.
972 *
973 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
974 */
975
976 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
977 const struct gfs2_inode *ip)
978 {
979 int error;
980
981 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
982 return -EPERM;
983
984 if ((dip->i_inode.i_mode & S_ISVTX) &&
985 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
986 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
987 return -EPERM;
988
989 if (IS_APPEND(&dip->i_inode))
990 return -EPERM;
991
992 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
993 if (error)
994 return error;
995
996 return gfs2_dir_check(&dip->i_inode, name, ip);
997 }
998
999 /**
1000 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1001 * @dip: The parent directory
1002 * @name: The name of the entry in the parent directory
1003 * @inode: The inode to be removed
1004 *
1005 * Called with all the locks and in a transaction. This will only be
1006 * called for a directory after it has been checked to ensure it is empty.
1007 *
1008 * Returns: 0 on success, or an error
1009 */
1010
1011 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1012 const struct dentry *dentry)
1013 {
1014 struct inode *inode = d_inode(dentry);
1015 struct gfs2_inode *ip = GFS2_I(inode);
1016 int error;
1017
1018 error = gfs2_dir_del(dip, dentry);
1019 if (error)
1020 return error;
1021
1022 ip->i_entries = 0;
1023 inode->i_ctime = CURRENT_TIME;
1024 if (S_ISDIR(inode->i_mode))
1025 clear_nlink(inode);
1026 else
1027 drop_nlink(inode);
1028 mark_inode_dirty(inode);
1029 if (inode->i_nlink == 0)
1030 gfs2_unlink_di(inode);
1031 return 0;
1032 }
1033
1034
1035 /**
1036 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1037 * @dir: The inode of the directory containing the inode to unlink
1038 * @dentry: The file itself
1039 *
1040 * This routine uses the type of the inode as a flag to figure out
1041 * whether this is an unlink or an rmdir.
1042 *
1043 * Returns: errno
1044 */
1045
1046 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1047 {
1048 struct gfs2_inode *dip = GFS2_I(dir);
1049 struct gfs2_sbd *sdp = GFS2_SB(dir);
1050 struct inode *inode = d_inode(dentry);
1051 struct gfs2_inode *ip = GFS2_I(inode);
1052 struct gfs2_holder ghs[3];
1053 struct gfs2_rgrpd *rgd;
1054 int error;
1055
1056 error = gfs2_rindex_update(sdp);
1057 if (error)
1058 return error;
1059
1060 error = -EROFS;
1061
1062 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1063 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1064
1065 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1066 if (!rgd)
1067 goto out_inodes;
1068
1069 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1070
1071
1072 error = gfs2_glock_nq(ghs); /* parent */
1073 if (error)
1074 goto out_parent;
1075
1076 error = gfs2_glock_nq(ghs + 1); /* child */
1077 if (error)
1078 goto out_child;
1079
1080 error = -ENOENT;
1081 if (inode->i_nlink == 0)
1082 goto out_rgrp;
1083
1084 if (S_ISDIR(inode->i_mode)) {
1085 error = -ENOTEMPTY;
1086 if (ip->i_entries > 2 || inode->i_nlink > 2)
1087 goto out_rgrp;
1088 }
1089
1090 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1091 if (error)
1092 goto out_rgrp;
1093
1094 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1095 if (error)
1096 goto out_gunlock;
1097
1098 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1099 if (error)
1100 goto out_end_trans;
1101
1102 error = gfs2_unlink_inode(dip, dentry);
1103
1104 out_end_trans:
1105 gfs2_trans_end(sdp);
1106 out_gunlock:
1107 gfs2_glock_dq(ghs + 2);
1108 out_rgrp:
1109 gfs2_glock_dq(ghs + 1);
1110 out_child:
1111 gfs2_glock_dq(ghs);
1112 out_parent:
1113 gfs2_holder_uninit(ghs + 2);
1114 out_inodes:
1115 gfs2_holder_uninit(ghs + 1);
1116 gfs2_holder_uninit(ghs);
1117 return error;
1118 }
1119
1120 /**
1121 * gfs2_symlink - Create a symlink
1122 * @dir: The directory to create the symlink in
1123 * @dentry: The dentry to put the symlink in
1124 * @symname: The thing which the link points to
1125 *
1126 * Returns: errno
1127 */
1128
1129 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1130 const char *symname)
1131 {
1132 struct gfs2_sbd *sdp = GFS2_SB(dir);
1133 unsigned int size;
1134
1135 size = strlen(symname);
1136 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1137 return -ENAMETOOLONG;
1138
1139 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1140 }
1141
1142 /**
1143 * gfs2_mkdir - Make a directory
1144 * @dir: The parent directory of the new one
1145 * @dentry: The dentry of the new directory
1146 * @mode: The mode of the new directory
1147 *
1148 * Returns: errno
1149 */
1150
1151 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1152 {
1153 struct gfs2_sbd *sdp = GFS2_SB(dir);
1154 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1155 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1156 }
1157
1158 /**
1159 * gfs2_mknod - Make a special file
1160 * @dir: The directory in which the special file will reside
1161 * @dentry: The dentry of the special file
1162 * @mode: The mode of the special file
1163 * @dev: The device specification of the special file
1164 *
1165 */
1166
1167 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1168 dev_t dev)
1169 {
1170 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1171 }
1172
1173 /**
1174 * gfs2_atomic_open - Atomically open a file
1175 * @dir: The directory
1176 * @dentry: The proposed new entry
1177 * @file: The proposed new struct file
1178 * @flags: open flags
1179 * @mode: File mode
1180 * @opened: Flag to say whether the file has been opened or not
1181 *
1182 * Returns: error code or 0 for success
1183 */
1184
1185 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1186 struct file *file, unsigned flags,
1187 umode_t mode, int *opened)
1188 {
1189 struct dentry *d;
1190 bool excl = !!(flags & O_EXCL);
1191
1192 if (!d_in_lookup(dentry))
1193 goto skip_lookup;
1194
1195 d = __gfs2_lookup(dir, dentry, file, opened);
1196 if (IS_ERR(d))
1197 return PTR_ERR(d);
1198 if (d != NULL)
1199 dentry = d;
1200 if (d_really_is_positive(dentry)) {
1201 if (!(*opened & FILE_OPENED))
1202 return finish_no_open(file, d);
1203 dput(d);
1204 return 0;
1205 }
1206
1207 BUG_ON(d != NULL);
1208
1209 skip_lookup:
1210 if (!(flags & O_CREAT))
1211 return -ENOENT;
1212
1213 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1214 }
1215
1216 /*
1217 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1218 * @this: move this
1219 * @to: to here
1220 *
1221 * Follow @to back to the root and make sure we don't encounter @this
1222 * Assumes we already hold the rename lock.
1223 *
1224 * Returns: errno
1225 */
1226
1227 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1228 {
1229 struct inode *dir = &to->i_inode;
1230 struct super_block *sb = dir->i_sb;
1231 struct inode *tmp;
1232 int error = 0;
1233
1234 igrab(dir);
1235
1236 for (;;) {
1237 if (dir == &this->i_inode) {
1238 error = -EINVAL;
1239 break;
1240 }
1241 if (dir == d_inode(sb->s_root)) {
1242 error = 0;
1243 break;
1244 }
1245
1246 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1247 if (!tmp) {
1248 error = -ENOENT;
1249 break;
1250 }
1251 if (IS_ERR(tmp)) {
1252 error = PTR_ERR(tmp);
1253 break;
1254 }
1255
1256 iput(dir);
1257 dir = tmp;
1258 }
1259
1260 iput(dir);
1261
1262 return error;
1263 }
1264
1265 /**
1266 * update_moved_ino - Update an inode that's being moved
1267 * @ip: The inode being moved
1268 * @ndip: The parent directory of the new filename
1269 * @dir_rename: True of ip is a directory
1270 *
1271 * Returns: errno
1272 */
1273
1274 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1275 int dir_rename)
1276 {
1277 int error;
1278 struct buffer_head *dibh;
1279
1280 if (dir_rename)
1281 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1282
1283 error = gfs2_meta_inode_buffer(ip, &dibh);
1284 if (error)
1285 return error;
1286 ip->i_inode.i_ctime = CURRENT_TIME;
1287 gfs2_trans_add_meta(ip->i_gl, dibh);
1288 gfs2_dinode_out(ip, dibh->b_data);
1289 brelse(dibh);
1290 return 0;
1291 }
1292
1293
1294 /**
1295 * gfs2_rename - Rename a file
1296 * @odir: Parent directory of old file name
1297 * @odentry: The old dentry of the file
1298 * @ndir: Parent directory of new file name
1299 * @ndentry: The new dentry of the file
1300 *
1301 * Returns: errno
1302 */
1303
1304 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1305 struct inode *ndir, struct dentry *ndentry)
1306 {
1307 struct gfs2_inode *odip = GFS2_I(odir);
1308 struct gfs2_inode *ndip = GFS2_I(ndir);
1309 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1310 struct gfs2_inode *nip = NULL;
1311 struct gfs2_sbd *sdp = GFS2_SB(odir);
1312 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1313 struct gfs2_rgrpd *nrgd;
1314 unsigned int num_gh;
1315 int dir_rename = 0;
1316 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1317 unsigned int x;
1318 int error;
1319
1320 if (d_really_is_positive(ndentry)) {
1321 nip = GFS2_I(d_inode(ndentry));
1322 if (ip == nip)
1323 return 0;
1324 }
1325
1326 error = gfs2_rindex_update(sdp);
1327 if (error)
1328 return error;
1329
1330 error = gfs2_rsqa_alloc(ndip);
1331 if (error)
1332 return error;
1333
1334 if (odip != ndip) {
1335 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1336 0, &r_gh);
1337 if (error)
1338 goto out;
1339
1340 if (S_ISDIR(ip->i_inode.i_mode)) {
1341 dir_rename = 1;
1342 /* don't move a directory into its subdir */
1343 error = gfs2_ok_to_move(ip, ndip);
1344 if (error)
1345 goto out_gunlock_r;
1346 }
1347 }
1348
1349 num_gh = 1;
1350 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1351 if (odip != ndip) {
1352 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1353 num_gh++;
1354 }
1355 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1356 num_gh++;
1357
1358 if (nip) {
1359 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1360 num_gh++;
1361 /* grab the resource lock for unlink flag twiddling
1362 * this is the case of the target file already existing
1363 * so we unlink before doing the rename
1364 */
1365 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1366 if (nrgd)
1367 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1368 }
1369
1370 for (x = 0; x < num_gh; x++) {
1371 error = gfs2_glock_nq(ghs + x);
1372 if (error)
1373 goto out_gunlock;
1374 }
1375
1376 error = -ENOENT;
1377 if (ip->i_inode.i_nlink == 0)
1378 goto out_gunlock;
1379
1380 /* Check out the old directory */
1381
1382 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1383 if (error)
1384 goto out_gunlock;
1385
1386 /* Check out the new directory */
1387
1388 if (nip) {
1389 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1390 if (error)
1391 goto out_gunlock;
1392
1393 if (nip->i_inode.i_nlink == 0) {
1394 error = -EAGAIN;
1395 goto out_gunlock;
1396 }
1397
1398 if (S_ISDIR(nip->i_inode.i_mode)) {
1399 if (nip->i_entries < 2) {
1400 gfs2_consist_inode(nip);
1401 error = -EIO;
1402 goto out_gunlock;
1403 }
1404 if (nip->i_entries > 2) {
1405 error = -ENOTEMPTY;
1406 goto out_gunlock;
1407 }
1408 }
1409 } else {
1410 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1411 if (error)
1412 goto out_gunlock;
1413
1414 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1415 switch (error) {
1416 case -ENOENT:
1417 error = 0;
1418 break;
1419 case 0:
1420 error = -EEXIST;
1421 default:
1422 goto out_gunlock;
1423 };
1424
1425 if (odip != ndip) {
1426 if (!ndip->i_inode.i_nlink) {
1427 error = -ENOENT;
1428 goto out_gunlock;
1429 }
1430 if (ndip->i_entries == (u32)-1) {
1431 error = -EFBIG;
1432 goto out_gunlock;
1433 }
1434 if (S_ISDIR(ip->i_inode.i_mode) &&
1435 ndip->i_inode.i_nlink == (u32)-1) {
1436 error = -EMLINK;
1437 goto out_gunlock;
1438 }
1439 }
1440 }
1441
1442 /* Check out the dir to be renamed */
1443
1444 if (dir_rename) {
1445 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1446 if (error)
1447 goto out_gunlock;
1448 }
1449
1450 if (nip == NULL) {
1451 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1452 if (error)
1453 goto out_gunlock;
1454 }
1455
1456 if (da.nr_blocks) {
1457 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1458 error = gfs2_quota_lock_check(ndip, &ap);
1459 if (error)
1460 goto out_gunlock;
1461
1462 error = gfs2_inplace_reserve(ndip, &ap);
1463 if (error)
1464 goto out_gunlock_q;
1465
1466 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1467 4 * RES_LEAF + 4, 0);
1468 if (error)
1469 goto out_ipreserv;
1470 } else {
1471 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1472 5 * RES_LEAF + 4, 0);
1473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 /* Remove the target file, if it exists */
1478
1479 if (nip)
1480 error = gfs2_unlink_inode(ndip, ndentry);
1481
1482 error = update_moved_ino(ip, ndip, dir_rename);
1483 if (error)
1484 goto out_end_trans;
1485
1486 error = gfs2_dir_del(odip, odentry);
1487 if (error)
1488 goto out_end_trans;
1489
1490 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1491 if (error)
1492 goto out_end_trans;
1493
1494 out_end_trans:
1495 gfs2_trans_end(sdp);
1496 out_ipreserv:
1497 if (da.nr_blocks)
1498 gfs2_inplace_release(ndip);
1499 out_gunlock_q:
1500 if (da.nr_blocks)
1501 gfs2_quota_unlock(ndip);
1502 out_gunlock:
1503 gfs2_dir_no_add(&da);
1504 while (x--) {
1505 gfs2_glock_dq(ghs + x);
1506 gfs2_holder_uninit(ghs + x);
1507 }
1508 out_gunlock_r:
1509 if (r_gh.gh_gl)
1510 gfs2_glock_dq_uninit(&r_gh);
1511 out:
1512 return error;
1513 }
1514
1515 /**
1516 * gfs2_exchange - exchange two files
1517 * @odir: Parent directory of old file name
1518 * @odentry: The old dentry of the file
1519 * @ndir: Parent directory of new file name
1520 * @ndentry: The new dentry of the file
1521 * @flags: The rename flags
1522 *
1523 * Returns: errno
1524 */
1525
1526 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1527 struct inode *ndir, struct dentry *ndentry,
1528 unsigned int flags)
1529 {
1530 struct gfs2_inode *odip = GFS2_I(odir);
1531 struct gfs2_inode *ndip = GFS2_I(ndir);
1532 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1533 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1534 struct gfs2_sbd *sdp = GFS2_SB(odir);
1535 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1536 unsigned int num_gh;
1537 unsigned int x;
1538 umode_t old_mode = oip->i_inode.i_mode;
1539 umode_t new_mode = nip->i_inode.i_mode;
1540 int error;
1541
1542 error = gfs2_rindex_update(sdp);
1543 if (error)
1544 return error;
1545
1546 if (odip != ndip) {
1547 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1548 0, &r_gh);
1549 if (error)
1550 goto out;
1551
1552 if (S_ISDIR(old_mode)) {
1553 /* don't move a directory into its subdir */
1554 error = gfs2_ok_to_move(oip, ndip);
1555 if (error)
1556 goto out_gunlock_r;
1557 }
1558
1559 if (S_ISDIR(new_mode)) {
1560 /* don't move a directory into its subdir */
1561 error = gfs2_ok_to_move(nip, odip);
1562 if (error)
1563 goto out_gunlock_r;
1564 }
1565 }
1566
1567 num_gh = 1;
1568 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1569 if (odip != ndip) {
1570 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1571 num_gh++;
1572 }
1573 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1574 num_gh++;
1575
1576 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1577 num_gh++;
1578
1579 for (x = 0; x < num_gh; x++) {
1580 error = gfs2_glock_nq(ghs + x);
1581 if (error)
1582 goto out_gunlock;
1583 }
1584
1585 error = -ENOENT;
1586 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1587 goto out_gunlock;
1588
1589 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1590 if (error)
1591 goto out_gunlock;
1592 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1593 if (error)
1594 goto out_gunlock;
1595
1596 if (S_ISDIR(old_mode)) {
1597 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1598 if (error)
1599 goto out_gunlock;
1600 }
1601 if (S_ISDIR(new_mode)) {
1602 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1603 if (error)
1604 goto out_gunlock;
1605 }
1606 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1607 if (error)
1608 goto out_gunlock;
1609
1610 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1611 if (error)
1612 goto out_end_trans;
1613
1614 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1615 if (error)
1616 goto out_end_trans;
1617
1618 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1619 IF2DT(old_mode));
1620 if (error)
1621 goto out_end_trans;
1622
1623 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1624 IF2DT(new_mode));
1625 if (error)
1626 goto out_end_trans;
1627
1628 if (odip != ndip) {
1629 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1630 inc_nlink(&odip->i_inode);
1631 drop_nlink(&ndip->i_inode);
1632 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1633 inc_nlink(&ndip->i_inode);
1634 drop_nlink(&odip->i_inode);
1635 }
1636 }
1637 mark_inode_dirty(&ndip->i_inode);
1638 if (odip != ndip)
1639 mark_inode_dirty(&odip->i_inode);
1640
1641 out_end_trans:
1642 gfs2_trans_end(sdp);
1643 out_gunlock:
1644 while (x--) {
1645 gfs2_glock_dq(ghs + x);
1646 gfs2_holder_uninit(ghs + x);
1647 }
1648 out_gunlock_r:
1649 if (r_gh.gh_gl)
1650 gfs2_glock_dq_uninit(&r_gh);
1651 out:
1652 return error;
1653 }
1654
1655 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1656 struct inode *ndir, struct dentry *ndentry,
1657 unsigned int flags)
1658 {
1659 flags &= ~RENAME_NOREPLACE;
1660
1661 if (flags & ~RENAME_EXCHANGE)
1662 return -EINVAL;
1663
1664 if (flags & RENAME_EXCHANGE)
1665 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1666
1667 return gfs2_rename(odir, odentry, ndir, ndentry);
1668 }
1669
1670 /**
1671 * gfs2_get_link - Follow a symbolic link
1672 * @dentry: The dentry of the link
1673 * @inode: The inode of the link
1674 * @done: destructor for return value
1675 *
1676 * This can handle symlinks of any size.
1677 *
1678 * Returns: 0 on success or error code
1679 */
1680
1681 static const char *gfs2_get_link(struct dentry *dentry,
1682 struct inode *inode,
1683 struct delayed_call *done)
1684 {
1685 struct gfs2_inode *ip = GFS2_I(inode);
1686 struct gfs2_holder i_gh;
1687 struct buffer_head *dibh;
1688 unsigned int size;
1689 char *buf;
1690 int error;
1691
1692 if (!dentry)
1693 return ERR_PTR(-ECHILD);
1694
1695 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1696 error = gfs2_glock_nq(&i_gh);
1697 if (error) {
1698 gfs2_holder_uninit(&i_gh);
1699 return ERR_PTR(error);
1700 }
1701
1702 size = (unsigned int)i_size_read(&ip->i_inode);
1703 if (size == 0) {
1704 gfs2_consist_inode(ip);
1705 buf = ERR_PTR(-EIO);
1706 goto out;
1707 }
1708
1709 error = gfs2_meta_inode_buffer(ip, &dibh);
1710 if (error) {
1711 buf = ERR_PTR(error);
1712 goto out;
1713 }
1714
1715 buf = kzalloc(size + 1, GFP_NOFS);
1716 if (!buf)
1717 buf = ERR_PTR(-ENOMEM);
1718 else
1719 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1720 brelse(dibh);
1721 out:
1722 gfs2_glock_dq_uninit(&i_gh);
1723 if (!IS_ERR(buf))
1724 set_delayed_call(done, kfree_link, buf);
1725 return buf;
1726 }
1727
1728 /**
1729 * gfs2_permission -
1730 * @inode: The inode
1731 * @mask: The mask to be tested
1732 * @flags: Indicates whether this is an RCU path walk or not
1733 *
1734 * This may be called from the VFS directly, or from within GFS2 with the
1735 * inode locked, so we look to see if the glock is already locked and only
1736 * lock the glock if its not already been done.
1737 *
1738 * Returns: errno
1739 */
1740
1741 int gfs2_permission(struct inode *inode, int mask)
1742 {
1743 struct gfs2_inode *ip;
1744 struct gfs2_holder i_gh;
1745 int error;
1746 int unlock = 0;
1747
1748
1749 ip = GFS2_I(inode);
1750 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1751 if (mask & MAY_NOT_BLOCK)
1752 return -ECHILD;
1753 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1754 if (error)
1755 return error;
1756 unlock = 1;
1757 }
1758
1759 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1760 error = -EACCES;
1761 else
1762 error = generic_permission(inode, mask);
1763 if (unlock)
1764 gfs2_glock_dq_uninit(&i_gh);
1765
1766 return error;
1767 }
1768
1769 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1770 {
1771 setattr_copy(inode, attr);
1772 mark_inode_dirty(inode);
1773 return 0;
1774 }
1775
1776 /**
1777 * gfs2_setattr_simple -
1778 * @ip:
1779 * @attr:
1780 *
1781 * Returns: errno
1782 */
1783
1784 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1785 {
1786 int error;
1787
1788 if (current->journal_info)
1789 return __gfs2_setattr_simple(inode, attr);
1790
1791 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1792 if (error)
1793 return error;
1794
1795 error = __gfs2_setattr_simple(inode, attr);
1796 gfs2_trans_end(GFS2_SB(inode));
1797 return error;
1798 }
1799
1800 static int setattr_chown(struct inode *inode, struct iattr *attr)
1801 {
1802 struct gfs2_inode *ip = GFS2_I(inode);
1803 struct gfs2_sbd *sdp = GFS2_SB(inode);
1804 kuid_t ouid, nuid;
1805 kgid_t ogid, ngid;
1806 int error;
1807 struct gfs2_alloc_parms ap;
1808
1809 ouid = inode->i_uid;
1810 ogid = inode->i_gid;
1811 nuid = attr->ia_uid;
1812 ngid = attr->ia_gid;
1813
1814 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1815 ouid = nuid = NO_UID_QUOTA_CHANGE;
1816 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1817 ogid = ngid = NO_GID_QUOTA_CHANGE;
1818
1819 error = gfs2_rsqa_alloc(ip);
1820 if (error)
1821 goto out;
1822
1823 error = gfs2_rindex_update(sdp);
1824 if (error)
1825 goto out;
1826
1827 error = gfs2_quota_lock(ip, nuid, ngid);
1828 if (error)
1829 goto out;
1830
1831 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1832
1833 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1834 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1835 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1836 if (error)
1837 goto out_gunlock_q;
1838 }
1839
1840 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1841 if (error)
1842 goto out_gunlock_q;
1843
1844 error = gfs2_setattr_simple(inode, attr);
1845 if (error)
1846 goto out_end_trans;
1847
1848 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1849 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1850 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1851 gfs2_quota_change(ip, ap.target, nuid, ngid);
1852 }
1853
1854 out_end_trans:
1855 gfs2_trans_end(sdp);
1856 out_gunlock_q:
1857 gfs2_quota_unlock(ip);
1858 out:
1859 return error;
1860 }
1861
1862 /**
1863 * gfs2_setattr - Change attributes on an inode
1864 * @dentry: The dentry which is changing
1865 * @attr: The structure describing the change
1866 *
1867 * The VFS layer wants to change one or more of an inodes attributes. Write
1868 * that change out to disk.
1869 *
1870 * Returns: errno
1871 */
1872
1873 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1874 {
1875 struct inode *inode = d_inode(dentry);
1876 struct gfs2_inode *ip = GFS2_I(inode);
1877 struct gfs2_holder i_gh;
1878 int error;
1879
1880 error = gfs2_rsqa_alloc(ip);
1881 if (error)
1882 return error;
1883
1884 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1885 if (error)
1886 return error;
1887
1888 error = -EPERM;
1889 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1890 goto out;
1891
1892 error = inode_change_ok(inode, attr);
1893 if (error)
1894 goto out;
1895
1896 if (attr->ia_valid & ATTR_SIZE)
1897 error = gfs2_setattr_size(inode, attr->ia_size);
1898 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1899 error = setattr_chown(inode, attr);
1900 else {
1901 error = gfs2_setattr_simple(inode, attr);
1902 if (!error && attr->ia_valid & ATTR_MODE)
1903 error = posix_acl_chmod(inode, inode->i_mode);
1904 }
1905
1906 out:
1907 if (!error)
1908 mark_inode_dirty(inode);
1909 gfs2_glock_dq_uninit(&i_gh);
1910 return error;
1911 }
1912
1913 /**
1914 * gfs2_getattr - Read out an inode's attributes
1915 * @mnt: The vfsmount the inode is being accessed from
1916 * @dentry: The dentry to stat
1917 * @stat: The inode's stats
1918 *
1919 * This may be called from the VFS directly, or from within GFS2 with the
1920 * inode locked, so we look to see if the glock is already locked and only
1921 * lock the glock if its not already been done. Note that its the NFS
1922 * readdirplus operation which causes this to be called (from filldir)
1923 * with the glock already held.
1924 *
1925 * Returns: errno
1926 */
1927
1928 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1929 struct kstat *stat)
1930 {
1931 struct inode *inode = d_inode(dentry);
1932 struct gfs2_inode *ip = GFS2_I(inode);
1933 struct gfs2_holder gh;
1934 int error;
1935 int unlock = 0;
1936
1937 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1938 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1939 if (error)
1940 return error;
1941 unlock = 1;
1942 }
1943
1944 generic_fillattr(inode, stat);
1945 if (unlock)
1946 gfs2_glock_dq_uninit(&gh);
1947
1948 return 0;
1949 }
1950
1951 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1952 u64 start, u64 len)
1953 {
1954 struct gfs2_inode *ip = GFS2_I(inode);
1955 struct gfs2_holder gh;
1956 int ret;
1957
1958 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1959 if (ret)
1960 return ret;
1961
1962 inode_lock(inode);
1963
1964 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1965 if (ret)
1966 goto out;
1967
1968 if (gfs2_is_stuffed(ip)) {
1969 u64 phys = ip->i_no_addr << inode->i_blkbits;
1970 u64 size = i_size_read(inode);
1971 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1972 FIEMAP_EXTENT_DATA_INLINE;
1973 phys += sizeof(struct gfs2_dinode);
1974 phys += start;
1975 if (start + len > size)
1976 len = size - start;
1977 if (start < size)
1978 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1979 len, flags);
1980 if (ret == 1)
1981 ret = 0;
1982 } else {
1983 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1984 gfs2_block_map);
1985 }
1986
1987 gfs2_glock_dq_uninit(&gh);
1988 out:
1989 inode_unlock(inode);
1990 return ret;
1991 }
1992
1993 const struct inode_operations gfs2_file_iops = {
1994 .permission = gfs2_permission,
1995 .setattr = gfs2_setattr,
1996 .getattr = gfs2_getattr,
1997 .setxattr = generic_setxattr,
1998 .getxattr = generic_getxattr,
1999 .listxattr = gfs2_listxattr,
2000 .removexattr = generic_removexattr,
2001 .fiemap = gfs2_fiemap,
2002 .get_acl = gfs2_get_acl,
2003 .set_acl = gfs2_set_acl,
2004 };
2005
2006 const struct inode_operations gfs2_dir_iops = {
2007 .create = gfs2_create,
2008 .lookup = gfs2_lookup,
2009 .link = gfs2_link,
2010 .unlink = gfs2_unlink,
2011 .symlink = gfs2_symlink,
2012 .mkdir = gfs2_mkdir,
2013 .rmdir = gfs2_unlink,
2014 .mknod = gfs2_mknod,
2015 .rename2 = gfs2_rename2,
2016 .permission = gfs2_permission,
2017 .setattr = gfs2_setattr,
2018 .getattr = gfs2_getattr,
2019 .setxattr = generic_setxattr,
2020 .getxattr = generic_getxattr,
2021 .listxattr = gfs2_listxattr,
2022 .removexattr = generic_removexattr,
2023 .fiemap = gfs2_fiemap,
2024 .get_acl = gfs2_get_acl,
2025 .set_acl = gfs2_set_acl,
2026 .atomic_open = gfs2_atomic_open,
2027 };
2028
2029 const struct inode_operations gfs2_symlink_iops = {
2030 .readlink = generic_readlink,
2031 .get_link = gfs2_get_link,
2032 .permission = gfs2_permission,
2033 .setattr = gfs2_setattr,
2034 .getattr = gfs2_getattr,
2035 .setxattr = generic_setxattr,
2036 .getxattr = generic_getxattr,
2037 .listxattr = gfs2_listxattr,
2038 .removexattr = generic_removexattr,
2039 .fiemap = gfs2_fiemap,
2040 };
2041
Linux kernel - Deliverables
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