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usb: dwc3: gadget: implement gadget state tracking
[linux-2.6.git] / fs / gfs2 / inode.c
blobcc00bd1d1f87ed331dea2b35b76d503a4bbf1c7a
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(-ENOBUFS);
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_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194 fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197 fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200 fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203 }
204
205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207 {
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240 fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243 fail_iput:
244 iput(inode);
245 goto fail;
246 }
247
248
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250 {
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264 }
265
266
267 /**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284 {
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318 out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324 }
325
326 /**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 umode_t mode)
337 {
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365 }
366
367 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
368 struct inode *inode)
369 {
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) &&
372 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
373 if (S_ISDIR(inode->i_mode))
374 inode->i_mode |= S_ISUID;
375 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
376 inode->i_mode &= ~07111;
377 inode->i_uid = dip->i_inode.i_uid;
378 } else
379 inode->i_uid = current_fsuid();
380
381 if (dip->i_inode.i_mode & S_ISGID) {
382 if (S_ISDIR(inode->i_mode))
383 inode->i_mode |= S_ISGID;
384 inode->i_gid = dip->i_inode.i_gid;
385 } else
386 inode->i_gid = current_fsgid();
387 }
388
389 static int alloc_dinode(struct gfs2_inode *ip, u32 flags)
390 {
391 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
392 int error;
393 int dblocks = 1;
394
395 error = gfs2_inplace_reserve(ip, RES_DINODE, flags);
396 if (error)
397 goto out;
398
399 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
400 if (error)
401 goto out_ipreserv;
402
403 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation);
404 ip->i_no_formal_ino = ip->i_generation;
405 ip->i_inode.i_ino = ip->i_no_addr;
406 ip->i_goal = ip->i_no_addr;
407
408 gfs2_trans_end(sdp);
409
410 out_ipreserv:
411 gfs2_inplace_release(ip);
412 out:
413 return error;
414 }
415
416 static void gfs2_init_dir(struct buffer_head *dibh,
417 const struct gfs2_inode *parent)
418 {
419 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
420 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
421
422 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
423 dent->de_inum = di->di_num; /* already GFS2 endian */
424 dent->de_type = cpu_to_be16(DT_DIR);
425
426 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
427 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
428 gfs2_inum_out(parent, dent);
429 dent->de_type = cpu_to_be16(DT_DIR);
430
431 }
432
433 /**
434 * init_dinode - Fill in a new dinode structure
435 * @dip: The directory this inode is being created in
436 * @ip: The inode
437 * @symname: The symlink destination (if a symlink)
438 * @bhp: The buffer head (returned to caller)
439 *
440 */
441
442 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
443 const char *symname, struct buffer_head **bhp)
444 {
445 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
446 struct gfs2_dinode *di;
447 struct buffer_head *dibh;
448 struct timespec tv = CURRENT_TIME;
449
450 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
451 gfs2_trans_add_meta(ip->i_gl, dibh);
452 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
453 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
454 di = (struct gfs2_dinode *)dibh->b_data;
455
456 di->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
457 di->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
458 di->di_mode = cpu_to_be32(ip->i_inode.i_mode);
459 di->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
460 di->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
461 di->di_nlink = 0;
462 di->di_size = cpu_to_be64(ip->i_inode.i_size);
463 di->di_blocks = cpu_to_be64(1);
464 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
465 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
466 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
467 di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_no_addr);
468 di->di_generation = cpu_to_be64(ip->i_generation);
469 di->di_flags = 0;
470 di->__pad1 = 0;
471 di->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) ? GFS2_FORMAT_DE : 0);
472 di->di_height = 0;
473 di->__pad2 = 0;
474 di->__pad3 = 0;
475 di->di_depth = 0;
476 di->di_entries = 0;
477 memset(&di->__pad4, 0, sizeof(di->__pad4));
478 di->di_eattr = 0;
479 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
480 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
481 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483
484 switch(ip->i_inode.i_mode & S_IFMT) {
485 case S_IFREG:
486 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
487 gfs2_tune_get(sdp, gt_new_files_jdata))
488 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
489 break;
490 case S_IFDIR:
491 di->di_flags |= cpu_to_be32(dip->i_diskflags &
492 GFS2_DIF_INHERIT_JDATA);
493 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
494 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
495 di->di_entries = cpu_to_be32(2);
496 gfs2_init_dir(dibh, dip);
497 break;
498 case S_IFLNK:
499 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
500 break;
501 }
502
503 set_buffer_uptodate(dibh);
504
505 *bhp = dibh;
506 }
507
508 static int make_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
509 const char *symname, struct buffer_head **bhp)
510 {
511 struct inode *inode = &ip->i_inode;
512 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
513 int error;
514
515 error = gfs2_rindex_update(sdp);
516 if (error)
517 return error;
518
519 error = gfs2_quota_lock(dip, inode->i_uid, inode->i_gid);
520 if (error)
521 return error;
522
523 error = gfs2_quota_check(dip, inode->i_uid, inode->i_gid);
524 if (error)
525 goto out_quota;
526
527 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
528 if (error)
529 goto out_quota;
530
531 init_dinode(dip, ip, symname, bhp);
532 gfs2_quota_change(dip, +1, inode->i_uid, inode->i_gid);
533 gfs2_trans_end(sdp);
534
535 out_quota:
536 gfs2_quota_unlock(dip);
537 return error;
538 }
539
540 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
541 struct gfs2_inode *ip)
542 {
543 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
544 int alloc_required;
545 struct buffer_head *dibh;
546 int error;
547
548 error = gfs2_rindex_update(sdp);
549 if (error)
550 return error;
551
552 error = gfs2_quota_lock(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
553 if (error)
554 goto fail;
555
556 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
557 if (alloc_required < 0)
558 goto fail_quota_locks;
559 if (alloc_required) {
560 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
561 if (error)
562 goto fail_quota_locks;
563
564 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
565 if (error)
566 goto fail_quota_locks;
567
568 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
569 dip->i_rgd->rd_length +
570 2 * RES_DINODE +
571 RES_STATFS + RES_QUOTA, 0);
572 if (error)
573 goto fail_ipreserv;
574 } else {
575 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
576 if (error)
577 goto fail_quota_locks;
578 }
579
580 error = gfs2_dir_add(&dip->i_inode, name, ip);
581 if (error)
582 goto fail_end_trans;
583
584 error = gfs2_meta_inode_buffer(ip, &dibh);
585 if (error)
586 goto fail_end_trans;
587 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1);
588 gfs2_trans_add_meta(ip->i_gl, dibh);
589 gfs2_dinode_out(ip, dibh->b_data);
590 brelse(dibh);
591 return 0;
592
593 fail_end_trans:
594 gfs2_trans_end(sdp);
595
596 fail_ipreserv:
597 if (alloc_required)
598 gfs2_inplace_release(dip);
599
600 fail_quota_locks:
601 gfs2_quota_unlock(dip);
602
603 fail:
604 return error;
605 }
606
607 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
608 void *fs_info)
609 {
610 const struct xattr *xattr;
611 int err = 0;
612
613 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
614 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
615 xattr->value_len, 0,
616 GFS2_EATYPE_SECURITY);
617 if (err < 0)
618 break;
619 }
620 return err;
621 }
622
623 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
624 const struct qstr *qstr)
625 {
626 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
627 &gfs2_initxattrs, NULL);
628 }
629
630 /**
631 * gfs2_create_inode - Create a new inode
632 * @dir: The parent directory
633 * @dentry: The new dentry
634 * @mode: The permissions on the new inode
635 * @dev: For device nodes, this is the device number
636 * @symname: For symlinks, this is the link destination
637 * @size: The initial size of the inode (ignored for directories)
638 *
639 * Returns: 0 on success, or error code
640 */
641
642 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
643 umode_t mode, dev_t dev, const char *symname,
644 unsigned int size, int excl)
645 {
646 const struct qstr *name = &dentry->d_name;
647 struct gfs2_holder ghs[2];
648 struct inode *inode = NULL;
649 struct gfs2_inode *dip = GFS2_I(dir), *ip;
650 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
651 struct gfs2_glock *io_gl;
652 int error;
653 struct buffer_head *bh = NULL;
654 u32 aflags = 0;
655
656 if (!name->len || name->len > GFS2_FNAMESIZE)
657 return -ENAMETOOLONG;
658
659 error = gfs2_rs_alloc(dip);
660 if (error)
661 return error;
662
663 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
664 if (error)
665 goto fail;
666
667 error = create_ok(dip, name, mode);
668 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
669 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
670 gfs2_glock_dq_uninit(ghs);
671 d_instantiate(dentry, inode);
672 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
673 }
674 if (error)
675 goto fail_gunlock;
676
677 inode = new_inode(sdp->sd_vfs);
678 if (!inode) {
679 gfs2_glock_dq_uninit(ghs);
680 return -ENOMEM;
681 }
682 ip = GFS2_I(inode);
683 error = gfs2_rs_alloc(ip);
684 if (error)
685 goto fail_free_inode;
686
687 set_bit(GIF_INVALID, &ip->i_flags);
688 inode->i_mode = mode;
689 inode->i_rdev = dev;
690 inode->i_size = size;
691 munge_mode_uid_gid(dip, inode);
692 ip->i_goal = dip->i_goal;
693
694 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
695 (dip->i_diskflags & GFS2_DIF_TOPDIR))
696 aflags |= GFS2_AF_ORLOV;
697
698 error = alloc_dinode(ip, aflags);
699 if (error)
700 goto fail_free_inode;
701
702 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
703 if (error)
704 goto fail_free_inode;
705
706 ip->i_gl->gl_object = ip;
707 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
708 if (error)
709 goto fail_free_inode;
710
711 error = make_dinode(dip, ip, symname, &bh);
712 if (error)
713 goto fail_gunlock2;
714
715 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
716 if (error)
717 goto fail_gunlock2;
718
719 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
720 if (error)
721 goto fail_gunlock2;
722
723 ip->i_iopen_gh.gh_gl->gl_object = ip;
724 gfs2_glock_put(io_gl);
725 gfs2_set_iop(inode);
726 insert_inode_hash(inode);
727
728 error = gfs2_inode_refresh(ip);
729 if (error)
730 goto fail_gunlock3;
731
732 error = gfs2_acl_create(dip, inode);
733 if (error)
734 goto fail_gunlock3;
735
736 error = gfs2_security_init(dip, ip, name);
737 if (error)
738 goto fail_gunlock3;
739
740 error = link_dinode(dip, name, ip);
741 if (error)
742 goto fail_gunlock3;
743
744 if (bh)
745 brelse(bh);
746
747 gfs2_trans_end(sdp);
748 gfs2_inplace_release(dip);
749 gfs2_quota_unlock(dip);
750 mark_inode_dirty(inode);
751 gfs2_glock_dq_uninit_m(2, ghs);
752 d_instantiate(dentry, inode);
753 return 0;
754
755 fail_gunlock3:
756 gfs2_glock_dq_uninit(ghs + 1);
757 if (ip->i_gl)
758 gfs2_glock_put(ip->i_gl);
759 goto fail_gunlock;
760
761 fail_gunlock2:
762 gfs2_glock_dq_uninit(ghs + 1);
763 fail_free_inode:
764 if (ip->i_gl)
765 gfs2_glock_put(ip->i_gl);
766 gfs2_rs_delete(ip);
767 free_inode_nonrcu(inode);
768 inode = NULL;
769 fail_gunlock:
770 gfs2_glock_dq_uninit(ghs);
771 if (inode && !IS_ERR(inode)) {
772 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
773 iput(inode);
774 }
775 fail:
776 if (bh)
777 brelse(bh);
778 return error;
779 }
780
781 /**
782 * gfs2_create - Create a file
783 * @dir: The directory in which to create the file
784 * @dentry: The dentry of the new file
785 * @mode: The mode of the new file
786 *
787 * Returns: errno
788 */
789
790 static int gfs2_create(struct inode *dir, struct dentry *dentry,
791 umode_t mode, bool excl)
792 {
793 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
794 }
795
796 /**
797 * gfs2_lookup - Look up a filename in a directory and return its inode
798 * @dir: The directory inode
799 * @dentry: The dentry of the new inode
800 * @nd: passed from Linux VFS, ignored by us
801 *
802 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
803 *
804 * Returns: errno
805 */
806
807 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
808 unsigned int flags)
809 {
810 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
811 if (inode && !IS_ERR(inode)) {
812 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
813 struct gfs2_holder gh;
814 int error;
815 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
816 if (error) {
817 iput(inode);
818 return ERR_PTR(error);
819 }
820 gfs2_glock_dq_uninit(&gh);
821 }
822 return d_splice_alias(inode, dentry);
823 }
824
825 /**
826 * gfs2_link - Link to a file
827 * @old_dentry: The inode to link
828 * @dir: Add link to this directory
829 * @dentry: The name of the link
830 *
831 * Link the inode in "old_dentry" into the directory "dir" with the
832 * name in "dentry".
833 *
834 * Returns: errno
835 */
836
837 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
838 struct dentry *dentry)
839 {
840 struct gfs2_inode *dip = GFS2_I(dir);
841 struct gfs2_sbd *sdp = GFS2_SB(dir);
842 struct inode *inode = old_dentry->d_inode;
843 struct gfs2_inode *ip = GFS2_I(inode);
844 struct gfs2_holder ghs[2];
845 struct buffer_head *dibh;
846 int alloc_required;
847 int error;
848
849 if (S_ISDIR(inode->i_mode))
850 return -EPERM;
851
852 error = gfs2_rs_alloc(dip);
853 if (error)
854 return error;
855
856 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
857 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
858
859 error = gfs2_glock_nq(ghs); /* parent */
860 if (error)
861 goto out_parent;
862
863 error = gfs2_glock_nq(ghs + 1); /* child */
864 if (error)
865 goto out_child;
866
867 error = -ENOENT;
868 if (inode->i_nlink == 0)
869 goto out_gunlock;
870
871 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
872 if (error)
873 goto out_gunlock;
874
875 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
876 switch (error) {
877 case -ENOENT:
878 break;
879 case 0:
880 error = -EEXIST;
881 default:
882 goto out_gunlock;
883 }
884
885 error = -EINVAL;
886 if (!dip->i_inode.i_nlink)
887 goto out_gunlock;
888 error = -EFBIG;
889 if (dip->i_entries == (u32)-1)
890 goto out_gunlock;
891 error = -EPERM;
892 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
893 goto out_gunlock;
894 error = -EINVAL;
895 if (!ip->i_inode.i_nlink)
896 goto out_gunlock;
897 error = -EMLINK;
898 if (ip->i_inode.i_nlink == (u32)-1)
899 goto out_gunlock;
900
901 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
902 if (error < 0)
903 goto out_gunlock;
904 error = 0;
905
906 if (alloc_required) {
907 error = gfs2_quota_lock_check(dip);
908 if (error)
909 goto out_gunlock;
910
911 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
912 if (error)
913 goto out_gunlock_q;
914
915 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
916 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
917 2 * RES_DINODE + RES_STATFS +
918 RES_QUOTA, 0);
919 if (error)
920 goto out_ipres;
921 } else {
922 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
923 if (error)
924 goto out_ipres;
925 }
926
927 error = gfs2_meta_inode_buffer(ip, &dibh);
928 if (error)
929 goto out_end_trans;
930
931 error = gfs2_dir_add(dir, &dentry->d_name, ip);
932 if (error)
933 goto out_brelse;
934
935 gfs2_trans_add_meta(ip->i_gl, dibh);
936 inc_nlink(&ip->i_inode);
937 ip->i_inode.i_ctime = CURRENT_TIME;
938 ihold(inode);
939 d_instantiate(dentry, inode);
940 mark_inode_dirty(inode);
941
942 out_brelse:
943 brelse(dibh);
944 out_end_trans:
945 gfs2_trans_end(sdp);
946 out_ipres:
947 if (alloc_required)
948 gfs2_inplace_release(dip);
949 out_gunlock_q:
950 if (alloc_required)
951 gfs2_quota_unlock(dip);
952 out_gunlock:
953 gfs2_glock_dq(ghs + 1);
954 out_child:
955 gfs2_glock_dq(ghs);
956 out_parent:
957 gfs2_holder_uninit(ghs);
958 gfs2_holder_uninit(ghs + 1);
959 return error;
960 }
961
962 /*
963 * gfs2_unlink_ok - check to see that a inode is still in a directory
964 * @dip: the directory
965 * @name: the name of the file
966 * @ip: the inode
967 *
968 * Assumes that the lock on (at least) @dip is held.
969 *
970 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
971 */
972
973 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
974 const struct gfs2_inode *ip)
975 {
976 int error;
977
978 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
979 return -EPERM;
980
981 if ((dip->i_inode.i_mode & S_ISVTX) &&
982 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
983 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
984 return -EPERM;
985
986 if (IS_APPEND(&dip->i_inode))
987 return -EPERM;
988
989 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
990 if (error)
991 return error;
992
993 error = gfs2_dir_check(&dip->i_inode, name, ip);
994 if (error)
995 return error;
996
997 return 0;
998 }
999
1000 /**
1001 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1002 * @dip: The parent directory
1003 * @name: The name of the entry in the parent directory
1004 * @inode: The inode to be removed
1005 *
1006 * Called with all the locks and in a transaction. This will only be
1007 * called for a directory after it has been checked to ensure it is empty.
1008 *
1009 * Returns: 0 on success, or an error
1010 */
1011
1012 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1013 const struct dentry *dentry)
1014 {
1015 struct inode *inode = dentry->d_inode;
1016 struct gfs2_inode *ip = GFS2_I(inode);
1017 int error;
1018
1019 error = gfs2_dir_del(dip, dentry);
1020 if (error)
1021 return error;
1022
1023 ip->i_entries = 0;
1024 inode->i_ctime = CURRENT_TIME;
1025 if (S_ISDIR(inode->i_mode))
1026 clear_nlink(inode);
1027 else
1028 drop_nlink(inode);
1029 mark_inode_dirty(inode);
1030 if (inode->i_nlink == 0)
1031 gfs2_unlink_di(inode);
1032 return 0;
1033 }
1034
1035
1036 /**
1037 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1038 * @dir: The inode of the directory containing the inode to unlink
1039 * @dentry: The file itself
1040 *
1041 * This routine uses the type of the inode as a flag to figure out
1042 * whether this is an unlink or an rmdir.
1043 *
1044 * Returns: errno
1045 */
1046
1047 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1048 {
1049 struct gfs2_inode *dip = GFS2_I(dir);
1050 struct gfs2_sbd *sdp = GFS2_SB(dir);
1051 struct inode *inode = dentry->d_inode;
1052 struct gfs2_inode *ip = GFS2_I(inode);
1053 struct gfs2_holder ghs[3];
1054 struct gfs2_rgrpd *rgd;
1055 int error;
1056
1057 error = gfs2_rindex_update(sdp);
1058 if (error)
1059 return error;
1060
1061 error = -EROFS;
1062
1063 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1064 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1065
1066 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1067 if (!rgd)
1068 goto out_inodes;
1069
1070 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1071
1072
1073 error = gfs2_glock_nq(ghs); /* parent */
1074 if (error)
1075 goto out_parent;
1076
1077 error = gfs2_glock_nq(ghs + 1); /* child */
1078 if (error)
1079 goto out_child;
1080
1081 error = -ENOENT;
1082 if (inode->i_nlink == 0)
1083 goto out_rgrp;
1084
1085 if (S_ISDIR(inode->i_mode)) {
1086 error = -ENOTEMPTY;
1087 if (ip->i_entries > 2 || inode->i_nlink > 2)
1088 goto out_rgrp;
1089 }
1090
1091 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1092 if (error)
1093 goto out_rgrp;
1094
1095 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1096 if (error)
1097 goto out_gunlock;
1098
1099 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1100 if (error)
1101 goto out_end_trans;
1102
1103 error = gfs2_unlink_inode(dip, dentry);
1104
1105 out_end_trans:
1106 gfs2_trans_end(sdp);
1107 out_gunlock:
1108 gfs2_glock_dq(ghs + 2);
1109 out_rgrp:
1110 gfs2_glock_dq(ghs + 1);
1111 out_child:
1112 gfs2_glock_dq(ghs);
1113 out_parent:
1114 gfs2_holder_uninit(ghs + 2);
1115 out_inodes:
1116 gfs2_holder_uninit(ghs + 1);
1117 gfs2_holder_uninit(ghs);
1118 return error;
1119 }
1120
1121 /**
1122 * gfs2_symlink - Create a symlink
1123 * @dir: The directory to create the symlink in
1124 * @dentry: The dentry to put the symlink in
1125 * @symname: The thing which the link points to
1126 *
1127 * Returns: errno
1128 */
1129
1130 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1131 const char *symname)
1132 {
1133 struct gfs2_sbd *sdp = GFS2_SB(dir);
1134 unsigned int size;
1135
1136 size = strlen(symname);
1137 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1138 return -ENAMETOOLONG;
1139
1140 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1141 }
1142
1143 /**
1144 * gfs2_mkdir - Make a directory
1145 * @dir: The parent directory of the new one
1146 * @dentry: The dentry of the new directory
1147 * @mode: The mode of the new directory
1148 *
1149 * Returns: errno
1150 */
1151
1152 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1153 {
1154 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1155 }
1156
1157 /**
1158 * gfs2_mknod - Make a special file
1159 * @dir: The directory in which the special file will reside
1160 * @dentry: The dentry of the special file
1161 * @mode: The mode of the special file
1162 * @dev: The device specification of the special file
1163 *
1164 */
1165
1166 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1167 dev_t dev)
1168 {
1169 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1170 }
1171
1172 /*
1173 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1174 * @this: move this
1175 * @to: to here
1176 *
1177 * Follow @to back to the root and make sure we don't encounter @this
1178 * Assumes we already hold the rename lock.
1179 *
1180 * Returns: errno
1181 */
1182
1183 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1184 {
1185 struct inode *dir = &to->i_inode;
1186 struct super_block *sb = dir->i_sb;
1187 struct inode *tmp;
1188 int error = 0;
1189
1190 igrab(dir);
1191
1192 for (;;) {
1193 if (dir == &this->i_inode) {
1194 error = -EINVAL;
1195 break;
1196 }
1197 if (dir == sb->s_root->d_inode) {
1198 error = 0;
1199 break;
1200 }
1201
1202 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1203 if (IS_ERR(tmp)) {
1204 error = PTR_ERR(tmp);
1205 break;
1206 }
1207
1208 iput(dir);
1209 dir = tmp;
1210 }
1211
1212 iput(dir);
1213
1214 return error;
1215 }
1216
1217 /**
1218 * gfs2_rename - Rename a file
1219 * @odir: Parent directory of old file name
1220 * @odentry: The old dentry of the file
1221 * @ndir: Parent directory of new file name
1222 * @ndentry: The new dentry of the file
1223 *
1224 * Returns: errno
1225 */
1226
1227 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1228 struct inode *ndir, struct dentry *ndentry)
1229 {
1230 struct gfs2_inode *odip = GFS2_I(odir);
1231 struct gfs2_inode *ndip = GFS2_I(ndir);
1232 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1233 struct gfs2_inode *nip = NULL;
1234 struct gfs2_sbd *sdp = GFS2_SB(odir);
1235 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1236 struct gfs2_rgrpd *nrgd;
1237 unsigned int num_gh;
1238 int dir_rename = 0;
1239 int alloc_required = 0;
1240 unsigned int x;
1241 int error;
1242
1243 if (ndentry->d_inode) {
1244 nip = GFS2_I(ndentry->d_inode);
1245 if (ip == nip)
1246 return 0;
1247 }
1248
1249 error = gfs2_rindex_update(sdp);
1250 if (error)
1251 return error;
1252
1253 error = gfs2_rs_alloc(ndip);
1254 if (error)
1255 return error;
1256
1257 if (odip != ndip) {
1258 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1259 0, &r_gh);
1260 if (error)
1261 goto out;
1262
1263 if (S_ISDIR(ip->i_inode.i_mode)) {
1264 dir_rename = 1;
1265 /* don't move a dirctory into it's subdir */
1266 error = gfs2_ok_to_move(ip, ndip);
1267 if (error)
1268 goto out_gunlock_r;
1269 }
1270 }
1271
1272 num_gh = 1;
1273 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1274 if (odip != ndip) {
1275 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1276 num_gh++;
1277 }
1278 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1279 num_gh++;
1280
1281 if (nip) {
1282 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1283 num_gh++;
1284 /* grab the resource lock for unlink flag twiddling
1285 * this is the case of the target file already existing
1286 * so we unlink before doing the rename
1287 */
1288 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1289 if (nrgd)
1290 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1291 }
1292
1293 for (x = 0; x < num_gh; x++) {
1294 error = gfs2_glock_nq(ghs + x);
1295 if (error)
1296 goto out_gunlock;
1297 }
1298
1299 error = -ENOENT;
1300 if (ip->i_inode.i_nlink == 0)
1301 goto out_gunlock;
1302
1303 /* Check out the old directory */
1304
1305 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1306 if (error)
1307 goto out_gunlock;
1308
1309 /* Check out the new directory */
1310
1311 if (nip) {
1312 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1313 if (error)
1314 goto out_gunlock;
1315
1316 if (nip->i_inode.i_nlink == 0) {
1317 error = -EAGAIN;
1318 goto out_gunlock;
1319 }
1320
1321 if (S_ISDIR(nip->i_inode.i_mode)) {
1322 if (nip->i_entries < 2) {
1323 gfs2_consist_inode(nip);
1324 error = -EIO;
1325 goto out_gunlock;
1326 }
1327 if (nip->i_entries > 2) {
1328 error = -ENOTEMPTY;
1329 goto out_gunlock;
1330 }
1331 }
1332 } else {
1333 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1334 if (error)
1335 goto out_gunlock;
1336
1337 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1338 switch (error) {
1339 case -ENOENT:
1340 error = 0;
1341 break;
1342 case 0:
1343 error = -EEXIST;
1344 default:
1345 goto out_gunlock;
1346 };
1347
1348 if (odip != ndip) {
1349 if (!ndip->i_inode.i_nlink) {
1350 error = -ENOENT;
1351 goto out_gunlock;
1352 }
1353 if (ndip->i_entries == (u32)-1) {
1354 error = -EFBIG;
1355 goto out_gunlock;
1356 }
1357 if (S_ISDIR(ip->i_inode.i_mode) &&
1358 ndip->i_inode.i_nlink == (u32)-1) {
1359 error = -EMLINK;
1360 goto out_gunlock;
1361 }
1362 }
1363 }
1364
1365 /* Check out the dir to be renamed */
1366
1367 if (dir_rename) {
1368 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1369 if (error)
1370 goto out_gunlock;
1371 }
1372
1373 if (nip == NULL)
1374 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1375 error = alloc_required;
1376 if (error < 0)
1377 goto out_gunlock;
1378
1379 if (alloc_required) {
1380 error = gfs2_quota_lock_check(ndip);
1381 if (error)
1382 goto out_gunlock;
1383
1384 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1385 if (error)
1386 goto out_gunlock_q;
1387
1388 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1389 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1390 4 * RES_DINODE + 4 * RES_LEAF +
1391 RES_STATFS + RES_QUOTA + 4, 0);
1392 if (error)
1393 goto out_ipreserv;
1394 } else {
1395 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1396 5 * RES_LEAF + 4, 0);
1397 if (error)
1398 goto out_gunlock;
1399 }
1400
1401 /* Remove the target file, if it exists */
1402
1403 if (nip)
1404 error = gfs2_unlink_inode(ndip, ndentry);
1405
1406 if (dir_rename) {
1407 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1408 if (error)
1409 goto out_end_trans;
1410 } else {
1411 struct buffer_head *dibh;
1412 error = gfs2_meta_inode_buffer(ip, &dibh);
1413 if (error)
1414 goto out_end_trans;
1415 ip->i_inode.i_ctime = CURRENT_TIME;
1416 gfs2_trans_add_meta(ip->i_gl, dibh);
1417 gfs2_dinode_out(ip, dibh->b_data);
1418 brelse(dibh);
1419 }
1420
1421 error = gfs2_dir_del(odip, odentry);
1422 if (error)
1423 goto out_end_trans;
1424
1425 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1426 if (error)
1427 goto out_end_trans;
1428
1429 out_end_trans:
1430 gfs2_trans_end(sdp);
1431 out_ipreserv:
1432 if (alloc_required)
1433 gfs2_inplace_release(ndip);
1434 out_gunlock_q:
1435 if (alloc_required)
1436 gfs2_quota_unlock(ndip);
1437 out_gunlock:
1438 while (x--) {
1439 gfs2_glock_dq(ghs + x);
1440 gfs2_holder_uninit(ghs + x);
1441 }
1442 out_gunlock_r:
1443 if (r_gh.gh_gl)
1444 gfs2_glock_dq_uninit(&r_gh);
1445 out:
1446 return error;
1447 }
1448
1449 /**
1450 * gfs2_follow_link - Follow a symbolic link
1451 * @dentry: The dentry of the link
1452 * @nd: Data that we pass to vfs_follow_link()
1453 *
1454 * This can handle symlinks of any size.
1455 *
1456 * Returns: 0 on success or error code
1457 */
1458
1459 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1460 {
1461 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1462 struct gfs2_holder i_gh;
1463 struct buffer_head *dibh;
1464 unsigned int size;
1465 char *buf;
1466 int error;
1467
1468 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1469 error = gfs2_glock_nq(&i_gh);
1470 if (error) {
1471 gfs2_holder_uninit(&i_gh);
1472 nd_set_link(nd, ERR_PTR(error));
1473 return NULL;
1474 }
1475
1476 size = (unsigned int)i_size_read(&ip->i_inode);
1477 if (size == 0) {
1478 gfs2_consist_inode(ip);
1479 buf = ERR_PTR(-EIO);
1480 goto out;
1481 }
1482
1483 error = gfs2_meta_inode_buffer(ip, &dibh);
1484 if (error) {
1485 buf = ERR_PTR(error);
1486 goto out;
1487 }
1488
1489 buf = kzalloc(size + 1, GFP_NOFS);
1490 if (!buf)
1491 buf = ERR_PTR(-ENOMEM);
1492 else
1493 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1494 brelse(dibh);
1495 out:
1496 gfs2_glock_dq_uninit(&i_gh);
1497 nd_set_link(nd, buf);
1498 return NULL;
1499 }
1500
1501 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1502 {
1503 char *s = nd_get_link(nd);
1504 if (!IS_ERR(s))
1505 kfree(s);
1506 }
1507
1508 /**
1509 * gfs2_permission -
1510 * @inode: The inode
1511 * @mask: The mask to be tested
1512 * @flags: Indicates whether this is an RCU path walk or not
1513 *
1514 * This may be called from the VFS directly, or from within GFS2 with the
1515 * inode locked, so we look to see if the glock is already locked and only
1516 * lock the glock if its not already been done.
1517 *
1518 * Returns: errno
1519 */
1520
1521 int gfs2_permission(struct inode *inode, int mask)
1522 {
1523 struct gfs2_inode *ip;
1524 struct gfs2_holder i_gh;
1525 int error;
1526 int unlock = 0;
1527
1528
1529 ip = GFS2_I(inode);
1530 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1531 if (mask & MAY_NOT_BLOCK)
1532 return -ECHILD;
1533 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1534 if (error)
1535 return error;
1536 unlock = 1;
1537 }
1538
1539 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1540 error = -EACCES;
1541 else
1542 error = generic_permission(inode, mask);
1543 if (unlock)
1544 gfs2_glock_dq_uninit(&i_gh);
1545
1546 return error;
1547 }
1548
1549 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1550 {
1551 setattr_copy(inode, attr);
1552 mark_inode_dirty(inode);
1553 return 0;
1554 }
1555
1556 /**
1557 * gfs2_setattr_simple -
1558 * @ip:
1559 * @attr:
1560 *
1561 * Returns: errno
1562 */
1563
1564 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1565 {
1566 int error;
1567
1568 if (current->journal_info)
1569 return __gfs2_setattr_simple(inode, attr);
1570
1571 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1572 if (error)
1573 return error;
1574
1575 error = __gfs2_setattr_simple(inode, attr);
1576 gfs2_trans_end(GFS2_SB(inode));
1577 return error;
1578 }
1579
1580 static int setattr_chown(struct inode *inode, struct iattr *attr)
1581 {
1582 struct gfs2_inode *ip = GFS2_I(inode);
1583 struct gfs2_sbd *sdp = GFS2_SB(inode);
1584 kuid_t ouid, nuid;
1585 kgid_t ogid, ngid;
1586 int error;
1587
1588 ouid = inode->i_uid;
1589 ogid = inode->i_gid;
1590 nuid = attr->ia_uid;
1591 ngid = attr->ia_gid;
1592
1593 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1594 ouid = nuid = NO_UID_QUOTA_CHANGE;
1595 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1596 ogid = ngid = NO_GID_QUOTA_CHANGE;
1597
1598 error = gfs2_quota_lock(ip, nuid, ngid);
1599 if (error)
1600 return error;
1601
1602 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1603 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1604 error = gfs2_quota_check(ip, nuid, ngid);
1605 if (error)
1606 goto out_gunlock_q;
1607 }
1608
1609 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1610 if (error)
1611 goto out_gunlock_q;
1612
1613 error = gfs2_setattr_simple(inode, attr);
1614 if (error)
1615 goto out_end_trans;
1616
1617 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1618 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1619 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1620 gfs2_quota_change(ip, -blocks, ouid, ogid);
1621 gfs2_quota_change(ip, blocks, nuid, ngid);
1622 }
1623
1624 out_end_trans:
1625 gfs2_trans_end(sdp);
1626 out_gunlock_q:
1627 gfs2_quota_unlock(ip);
1628 return error;
1629 }
1630
1631 /**
1632 * gfs2_setattr - Change attributes on an inode
1633 * @dentry: The dentry which is changing
1634 * @attr: The structure describing the change
1635 *
1636 * The VFS layer wants to change one or more of an inodes attributes. Write
1637 * that change out to disk.
1638 *
1639 * Returns: errno
1640 */
1641
1642 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1643 {
1644 struct inode *inode = dentry->d_inode;
1645 struct gfs2_inode *ip = GFS2_I(inode);
1646 struct gfs2_holder i_gh;
1647 int error;
1648
1649 error = gfs2_rs_alloc(ip);
1650 if (error)
1651 return error;
1652
1653 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1654 if (error)
1655 return error;
1656
1657 error = -EPERM;
1658 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1659 goto out;
1660
1661 error = inode_change_ok(inode, attr);
1662 if (error)
1663 goto out;
1664
1665 if (attr->ia_valid & ATTR_SIZE)
1666 error = gfs2_setattr_size(inode, attr->ia_size);
1667 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1668 error = setattr_chown(inode, attr);
1669 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1670 error = gfs2_acl_chmod(ip, attr);
1671 else
1672 error = gfs2_setattr_simple(inode, attr);
1673
1674 out:
1675 if (!error)
1676 mark_inode_dirty(inode);
1677 gfs2_glock_dq_uninit(&i_gh);
1678 return error;
1679 }
1680
1681 /**
1682 * gfs2_getattr - Read out an inode's attributes
1683 * @mnt: The vfsmount the inode is being accessed from
1684 * @dentry: The dentry to stat
1685 * @stat: The inode's stats
1686 *
1687 * This may be called from the VFS directly, or from within GFS2 with the
1688 * inode locked, so we look to see if the glock is already locked and only
1689 * lock the glock if its not already been done. Note that its the NFS
1690 * readdirplus operation which causes this to be called (from filldir)
1691 * with the glock already held.
1692 *
1693 * Returns: errno
1694 */
1695
1696 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1697 struct kstat *stat)
1698 {
1699 struct inode *inode = dentry->d_inode;
1700 struct gfs2_inode *ip = GFS2_I(inode);
1701 struct gfs2_holder gh;
1702 int error;
1703 int unlock = 0;
1704
1705 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1706 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1707 if (error)
1708 return error;
1709 unlock = 1;
1710 }
1711
1712 generic_fillattr(inode, stat);
1713 if (unlock)
1714 gfs2_glock_dq_uninit(&gh);
1715
1716 return 0;
1717 }
1718
1719 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1720 const void *data, size_t size, int flags)
1721 {
1722 struct inode *inode = dentry->d_inode;
1723 struct gfs2_inode *ip = GFS2_I(inode);
1724 struct gfs2_holder gh;
1725 int ret;
1726
1727 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1728 ret = gfs2_glock_nq(&gh);
1729 if (ret == 0) {
1730 ret = gfs2_rs_alloc(ip);
1731 if (ret == 0)
1732 ret = generic_setxattr(dentry, name, data, size, flags);
1733 gfs2_glock_dq(&gh);
1734 }
1735 gfs2_holder_uninit(&gh);
1736 return ret;
1737 }
1738
1739 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1740 void *data, size_t size)
1741 {
1742 struct inode *inode = dentry->d_inode;
1743 struct gfs2_inode *ip = GFS2_I(inode);
1744 struct gfs2_holder gh;
1745 int ret;
1746
1747 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1748 ret = gfs2_glock_nq(&gh);
1749 if (ret == 0) {
1750 ret = generic_getxattr(dentry, name, data, size);
1751 gfs2_glock_dq(&gh);
1752 }
1753 gfs2_holder_uninit(&gh);
1754 return ret;
1755 }
1756
1757 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1758 {
1759 struct inode *inode = dentry->d_inode;
1760 struct gfs2_inode *ip = GFS2_I(inode);
1761 struct gfs2_holder gh;
1762 int ret;
1763
1764 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1765 ret = gfs2_glock_nq(&gh);
1766 if (ret == 0) {
1767 ret = gfs2_rs_alloc(ip);
1768 if (ret == 0)
1769 ret = generic_removexattr(dentry, name);
1770 gfs2_glock_dq(&gh);
1771 }
1772 gfs2_holder_uninit(&gh);
1773 return ret;
1774 }
1775
1776 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1777 u64 start, u64 len)
1778 {
1779 struct gfs2_inode *ip = GFS2_I(inode);
1780 struct gfs2_holder gh;
1781 int ret;
1782
1783 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1784 if (ret)
1785 return ret;
1786
1787 mutex_lock(&inode->i_mutex);
1788
1789 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1790 if (ret)
1791 goto out;
1792
1793 if (gfs2_is_stuffed(ip)) {
1794 u64 phys = ip->i_no_addr << inode->i_blkbits;
1795 u64 size = i_size_read(inode);
1796 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1797 FIEMAP_EXTENT_DATA_INLINE;
1798 phys += sizeof(struct gfs2_dinode);
1799 phys += start;
1800 if (start + len > size)
1801 len = size - start;
1802 if (start < size)
1803 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1804 len, flags);
1805 if (ret == 1)
1806 ret = 0;
1807 } else {
1808 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1809 gfs2_block_map);
1810 }
1811
1812 gfs2_glock_dq_uninit(&gh);
1813 out:
1814 mutex_unlock(&inode->i_mutex);
1815 return ret;
1816 }
1817
1818 const struct inode_operations gfs2_file_iops = {
1819 .permission = gfs2_permission,
1820 .setattr = gfs2_setattr,
1821 .getattr = gfs2_getattr,
1822 .setxattr = gfs2_setxattr,
1823 .getxattr = gfs2_getxattr,
1824 .listxattr = gfs2_listxattr,
1825 .removexattr = gfs2_removexattr,
1826 .fiemap = gfs2_fiemap,
1827 .get_acl = gfs2_get_acl,
1828 };
1829
1830 const struct inode_operations gfs2_dir_iops = {
1831 .create = gfs2_create,
1832 .lookup = gfs2_lookup,
1833 .link = gfs2_link,
1834 .unlink = gfs2_unlink,
1835 .symlink = gfs2_symlink,
1836 .mkdir = gfs2_mkdir,
1837 .rmdir = gfs2_unlink,
1838 .mknod = gfs2_mknod,
1839 .rename = gfs2_rename,
1840 .permission = gfs2_permission,
1841 .setattr = gfs2_setattr,
1842 .getattr = gfs2_getattr,
1843 .setxattr = gfs2_setxattr,
1844 .getxattr = gfs2_getxattr,
1845 .listxattr = gfs2_listxattr,
1846 .removexattr = gfs2_removexattr,
1847 .fiemap = gfs2_fiemap,
1848 .get_acl = gfs2_get_acl,
1849 };
1850
1851 const struct inode_operations gfs2_symlink_iops = {
1852 .readlink = generic_readlink,
1853 .follow_link = gfs2_follow_link,
1854 .put_link = gfs2_put_link,
1855 .permission = gfs2_permission,
1856 .setattr = gfs2_setattr,
1857 .getattr = gfs2_getattr,
1858 .setxattr = gfs2_setxattr,
1859 .getxattr = gfs2_getxattr,
1860 .listxattr = gfs2_listxattr,
1861 .removexattr = gfs2_removexattr,
1862 .fiemap = gfs2_fiemap,
1863 .get_acl = gfs2_get_acl,
1864 };
1865
Linus' kernel tree