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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
40struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44};
45
46static 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
62static 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
74struct 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
85static 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
105static 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
140struct 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
191fail_refresh:
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203}
204
205struct 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
240fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243fail_iput:
244 iput(inode);
245 goto fail;
246}
247
248
249struct 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
282struct 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);
318out:
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
335static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 unsigned int 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
367static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
368 unsigned int *uid, unsigned int *gid)
369{
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
372 if (S_ISDIR(*mode))
373 *mode |= S_ISUID;
374 else if (dip->i_inode.i_uid != current_fsuid())
375 *mode &= ~07111;
376 *uid = dip->i_inode.i_uid;
377 } else
378 *uid = current_fsuid();
379
380 if (dip->i_inode.i_mode & S_ISGID) {
381 if (S_ISDIR(*mode))
382 *mode |= S_ISGID;
383 *gid = dip->i_inode.i_gid;
384 } else
385 *gid = current_fsgid();
386}
387
388static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
389{
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
391 int error;
392
393 if (gfs2_alloc_get(dip) == NULL)
394 return -ENOMEM;
395
396 dip->i_alloc->al_requested = RES_DINODE;
397 error = gfs2_inplace_reserve(dip);
398 if (error)
399 goto out;
400
401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 if (error)
403 goto out_ipreserv;
404
405 error = gfs2_alloc_di(dip, no_addr, generation);
406
407 gfs2_trans_end(sdp);
408
409out_ipreserv:
410 gfs2_inplace_release(dip);
411out:
412 gfs2_alloc_put(dip);
413 return error;
414}
415
416static 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 * @gl: The glock covering the new inode
437 * @inum: The inode number
438 * @mode: The file permissions
439 * @uid: The uid of the new inode
440 * @gid: The gid of the new inode
441 * @generation: The generation number of the new inode
442 * @dev: The device number (if a device node)
443 * @symname: The symlink destination (if a symlink)
444 * @size: The inode size (ignored for directories)
445 * @bhp: The buffer head (returned to caller)
446 *
447 */
448
449static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
450 const struct gfs2_inum_host *inum, unsigned int mode,
451 unsigned int uid, unsigned int gid,
452 const u64 *generation, dev_t dev, const char *symname,
453 unsigned size, struct buffer_head **bhp)
454{
455 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
456 struct gfs2_dinode *di;
457 struct buffer_head *dibh;
458 struct timespec tv = CURRENT_TIME;
459
460 dibh = gfs2_meta_new(gl, inum->no_addr);
461 gfs2_trans_add_bh(gl, dibh, 1);
462 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
463 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
464 di = (struct gfs2_dinode *)dibh->b_data;
465
466 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
467 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
468 di->di_mode = cpu_to_be32(mode);
469 di->di_uid = cpu_to_be32(uid);
470 di->di_gid = cpu_to_be32(gid);
471 di->di_nlink = 0;
472 di->di_size = cpu_to_be64(size);
473 di->di_blocks = cpu_to_be64(1);
474 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
475 di->di_major = cpu_to_be32(MAJOR(dev));
476 di->di_minor = cpu_to_be32(MINOR(dev));
477 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
478 di->di_generation = cpu_to_be64(*generation);
479 di->di_flags = 0;
480 di->__pad1 = 0;
481 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
482 di->di_height = 0;
483 di->__pad2 = 0;
484 di->__pad3 = 0;
485 di->di_depth = 0;
486 di->di_entries = 0;
487 memset(&di->__pad4, 0, sizeof(di->__pad4));
488 di->di_eattr = 0;
489 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
490 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
491 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
492 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
493
494 switch(mode & S_IFMT) {
495 case S_IFREG:
496 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
497 gfs2_tune_get(sdp, gt_new_files_jdata))
498 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
499 break;
500 case S_IFDIR:
501 di->di_flags |= cpu_to_be32(dip->i_diskflags &
502 GFS2_DIF_INHERIT_JDATA);
503 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
504 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
505 di->di_entries = cpu_to_be32(2);
506 gfs2_init_dir(dibh, dip);
507 break;
508 case S_IFLNK:
509 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
510 break;
511 }
512
513 set_buffer_uptodate(dibh);
514
515 *bhp = dibh;
516}
517
518static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
519 unsigned int mode, const struct gfs2_inum_host *inum,
520 const u64 *generation, dev_t dev, const char *symname,
521 unsigned int size, struct buffer_head **bhp)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 unsigned int uid, gid;
525 int error;
526
527 munge_mode_uid_gid(dip, &mode, &uid, &gid);
528 if (!gfs2_alloc_get(dip))
529 return -ENOMEM;
530
531 error = gfs2_quota_lock(dip, uid, gid);
532 if (error)
533 goto out;
534
535 error = gfs2_quota_check(dip, uid, gid);
536 if (error)
537 goto out_quota;
538
539 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
540 if (error)
541 goto out_quota;
542
543 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
544 gfs2_quota_change(dip, +1, uid, gid);
545 gfs2_trans_end(sdp);
546
547out_quota:
548 gfs2_quota_unlock(dip);
549out:
550 gfs2_alloc_put(dip);
551 return error;
552}
553
554static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
555 struct gfs2_inode *ip)
556{
557 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
558 struct gfs2_alloc *al;
559 int alloc_required;
560 struct buffer_head *dibh;
561 int error;
562
563 al = gfs2_alloc_get(dip);
564 if (!al)
565 return -ENOMEM;
566
567 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
568 if (error)
569 goto fail;
570
571 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
572 if (alloc_required < 0)
573 goto fail_quota_locks;
574 if (alloc_required) {
575 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
576 if (error)
577 goto fail_quota_locks;
578
579 al->al_requested = sdp->sd_max_dirres;
580
581 error = gfs2_inplace_reserve(dip);
582 if (error)
583 goto fail_quota_locks;
584
585 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
586 al->al_rgd->rd_length +
587 2 * RES_DINODE +
588 RES_STATFS + RES_QUOTA, 0);
589 if (error)
590 goto fail_ipreserv;
591 } else {
592 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
593 if (error)
594 goto fail_quota_locks;
595 }
596
597 error = gfs2_dir_add(&dip->i_inode, name, ip);
598 if (error)
599 goto fail_end_trans;
600
601 error = gfs2_meta_inode_buffer(ip, &dibh);
602 if (error)
603 goto fail_end_trans;
604 inc_nlink(&ip->i_inode);
605 if (S_ISDIR(ip->i_inode.i_mode))
606 inc_nlink(&ip->i_inode);
607 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
608 gfs2_dinode_out(ip, dibh->b_data);
609 brelse(dibh);
610 return 0;
611
612fail_end_trans:
613 gfs2_trans_end(sdp);
614
615fail_ipreserv:
616 if (dip->i_alloc->al_rgd)
617 gfs2_inplace_release(dip);
618
619fail_quota_locks:
620 gfs2_quota_unlock(dip);
621
622fail:
623 gfs2_alloc_put(dip);
624 return error;
625}
626
627static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
628 const struct qstr *qstr)
629{
630 int err;
631 size_t len;
632 void *value;
633 char *name;
634
635 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
636 &name, &value, &len);
637
638 if (err) {
639 if (err == -EOPNOTSUPP)
640 return 0;
641 return err;
642 }
643
644 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
645 GFS2_EATYPE_SECURITY);
646 kfree(value);
647 kfree(name);
648
649 return err;
650}
651
652/**
653 * gfs2_create_inode - Create a new inode
654 * @dir: The parent directory
655 * @dentry: The new dentry
656 * @mode: The permissions on the new inode
657 * @dev: For device nodes, this is the device number
658 * @symname: For symlinks, this is the link destination
659 * @size: The initial size of the inode (ignored for directories)
660 *
661 * Returns: 0 on success, or error code
662 */
663
664static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
665 unsigned int mode, dev_t dev, const char *symname,
666 unsigned int size)
667{
668 const struct qstr *name = &dentry->d_name;
669 struct gfs2_holder ghs[2];
670 struct inode *inode = NULL;
671 struct gfs2_inode *dip = GFS2_I(dir);
672 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
673 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
674 int error;
675 u64 generation;
676 struct buffer_head *bh = NULL;
677
678 if (!name->len || name->len > GFS2_FNAMESIZE)
679 return -ENAMETOOLONG;
680
681 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
682 if (error)
683 goto fail;
684
685 error = create_ok(dip, name, mode);
686 if (error)
687 goto fail_gunlock;
688
689 error = alloc_dinode(dip, &inum.no_addr, &generation);
690 if (error)
691 goto fail_gunlock;
692 inum.no_formal_ino = generation;
693
694 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
695 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
696 if (error)
697 goto fail_gunlock;
698
699 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
700 if (error)
701 goto fail_gunlock2;
702
703 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
704 inum.no_formal_ino, 0);
705 if (IS_ERR(inode))
706 goto fail_gunlock2;
707
708 error = gfs2_inode_refresh(GFS2_I(inode));
709 if (error)
710 goto fail_gunlock2;
711
712 error = gfs2_acl_create(dip, inode);
713 if (error)
714 goto fail_gunlock2;
715
716 error = gfs2_security_init(dip, GFS2_I(inode), name);
717 if (error)
718 goto fail_gunlock2;
719
720 error = link_dinode(dip, name, GFS2_I(inode));
721 if (error)
722 goto fail_gunlock2;
723
724 if (bh)
725 brelse(bh);
726
727 gfs2_trans_end(sdp);
728 if (dip->i_alloc->al_rgd)
729 gfs2_inplace_release(dip);
730 gfs2_quota_unlock(dip);
731 gfs2_alloc_put(dip);
732 gfs2_glock_dq_uninit_m(2, ghs);
733 mark_inode_dirty(inode);
734 d_instantiate(dentry, inode);
735 return 0;
736
737fail_gunlock2:
738 gfs2_glock_dq_uninit(ghs + 1);
739 if (inode && !IS_ERR(inode))
740 iput(inode);
741fail_gunlock:
742 gfs2_glock_dq_uninit(ghs);
743fail:
744 if (bh)
745 brelse(bh);
746 return error;
747}
748
749/**
750 * gfs2_create - Create a file
751 * @dir: The directory in which to create the file
752 * @dentry: The dentry of the new file
753 * @mode: The mode of the new file
754 *
755 * Returns: errno
756 */
757
758static int gfs2_create(struct inode *dir, struct dentry *dentry,
759 int mode, struct nameidata *nd)
760{
761 struct inode *inode;
762 int ret;
763
764 for (;;) {
765 ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0);
766 if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL)))
767 return ret;
768
769 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
770 if (inode) {
771 if (!IS_ERR(inode))
772 break;
773 return PTR_ERR(inode);
774 }
775 }
776
777 d_instantiate(dentry, inode);
778 return 0;
779}
780
781/**
782 * gfs2_lookup - Look up a filename in a directory and return its inode
783 * @dir: The directory inode
784 * @dentry: The dentry of the new inode
785 * @nd: passed from Linux VFS, ignored by us
786 *
787 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
788 *
789 * Returns: errno
790 */
791
792static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
793 struct nameidata *nd)
794{
795 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
796 if (inode && !IS_ERR(inode)) {
797 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
798 struct gfs2_holder gh;
799 int error;
800 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
801 if (error) {
802 iput(inode);
803 return ERR_PTR(error);
804 }
805 gfs2_glock_dq_uninit(&gh);
806 }
807 return d_splice_alias(inode, dentry);
808}
809
810/**
811 * gfs2_link - Link to a file
812 * @old_dentry: The inode to link
813 * @dir: Add link to this directory
814 * @dentry: The name of the link
815 *
816 * Link the inode in "old_dentry" into the directory "dir" with the
817 * name in "dentry".
818 *
819 * Returns: errno
820 */
821
822static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
823 struct dentry *dentry)
824{
825 struct gfs2_inode *dip = GFS2_I(dir);
826 struct gfs2_sbd *sdp = GFS2_SB(dir);
827 struct inode *inode = old_dentry->d_inode;
828 struct gfs2_inode *ip = GFS2_I(inode);
829 struct gfs2_holder ghs[2];
830 struct buffer_head *dibh;
831 int alloc_required;
832 int error;
833
834 if (S_ISDIR(inode->i_mode))
835 return -EPERM;
836
837 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
838 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
839
840 error = gfs2_glock_nq(ghs); /* parent */
841 if (error)
842 goto out_parent;
843
844 error = gfs2_glock_nq(ghs + 1); /* child */
845 if (error)
846 goto out_child;
847
848 error = -ENOENT;
849 if (inode->i_nlink == 0)
850 goto out_gunlock;
851
852 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
853 if (error)
854 goto out_gunlock;
855
856 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
857 switch (error) {
858 case -ENOENT:
859 break;
860 case 0:
861 error = -EEXIST;
862 default:
863 goto out_gunlock;
864 }
865
866 error = -EINVAL;
867 if (!dip->i_inode.i_nlink)
868 goto out_gunlock;
869 error = -EFBIG;
870 if (dip->i_entries == (u32)-1)
871 goto out_gunlock;
872 error = -EPERM;
873 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
874 goto out_gunlock;
875 error = -EINVAL;
876 if (!ip->i_inode.i_nlink)
877 goto out_gunlock;
878 error = -EMLINK;
879 if (ip->i_inode.i_nlink == (u32)-1)
880 goto out_gunlock;
881
882 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
883 if (error < 0)
884 goto out_gunlock;
885 error = 0;
886
887 if (alloc_required) {
888 struct gfs2_alloc *al = gfs2_alloc_get(dip);
889 if (!al) {
890 error = -ENOMEM;
891 goto out_gunlock;
892 }
893
894 error = gfs2_quota_lock_check(dip);
895 if (error)
896 goto out_alloc;
897
898 al->al_requested = sdp->sd_max_dirres;
899
900 error = gfs2_inplace_reserve(dip);
901 if (error)
902 goto out_gunlock_q;
903
904 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
905 gfs2_rg_blocks(al) +
906 2 * RES_DINODE + RES_STATFS +
907 RES_QUOTA, 0);
908 if (error)
909 goto out_ipres;
910 } else {
911 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
912 if (error)
913 goto out_ipres;
914 }
915
916 error = gfs2_meta_inode_buffer(ip, &dibh);
917 if (error)
918 goto out_end_trans;
919
920 error = gfs2_dir_add(dir, &dentry->d_name, ip);
921 if (error)
922 goto out_brelse;
923
924 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
925 inc_nlink(&ip->i_inode);
926 ip->i_inode.i_ctime = CURRENT_TIME;
927 gfs2_dinode_out(ip, dibh->b_data);
928 mark_inode_dirty(&ip->i_inode);
929
930out_brelse:
931 brelse(dibh);
932out_end_trans:
933 gfs2_trans_end(sdp);
934out_ipres:
935 if (alloc_required)
936 gfs2_inplace_release(dip);
937out_gunlock_q:
938 if (alloc_required)
939 gfs2_quota_unlock(dip);
940out_alloc:
941 if (alloc_required)
942 gfs2_alloc_put(dip);
943out_gunlock:
944 gfs2_glock_dq(ghs + 1);
945out_child:
946 gfs2_glock_dq(ghs);
947out_parent:
948 gfs2_holder_uninit(ghs);
949 gfs2_holder_uninit(ghs + 1);
950 if (!error) {
951 ihold(inode);
952 d_instantiate(dentry, inode);
953 mark_inode_dirty(inode);
954 }
955 return error;
956}
957
958/*
959 * gfs2_unlink_ok - check to see that a inode is still in a directory
960 * @dip: the directory
961 * @name: the name of the file
962 * @ip: the inode
963 *
964 * Assumes that the lock on (at least) @dip is held.
965 *
966 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
967 */
968
969static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
970 const struct gfs2_inode *ip)
971{
972 int error;
973
974 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
975 return -EPERM;
976
977 if ((dip->i_inode.i_mode & S_ISVTX) &&
978 dip->i_inode.i_uid != current_fsuid() &&
979 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
980 return -EPERM;
981
982 if (IS_APPEND(&dip->i_inode))
983 return -EPERM;
984
985 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
986 if (error)
987 return error;
988
989 error = gfs2_dir_check(&dip->i_inode, name, ip);
990 if (error)
991 return error;
992
993 return 0;
994}
995
996/**
997 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
998 * @dip: The parent directory
999 * @name: The name of the entry in the parent directory
1000 * @bh: The inode buffer for the inode to be removed
1001 * @inode: The inode to be removed
1002 *
1003 * Called with all the locks and in a transaction. This will only be
1004 * called for a directory after it has been checked to ensure it is empty.
1005 *
1006 * Returns: 0 on success, or an error
1007 */
1008
1009static int gfs2_unlink_inode(struct gfs2_inode *dip,
1010 const struct dentry *dentry,
1011 struct buffer_head *bh)
1012{
1013 struct inode *inode = dentry->d_inode;
1014 struct gfs2_inode *ip = GFS2_I(inode);
1015 int error;
1016
1017 error = gfs2_dir_del(dip, dentry);
1018 if (error)
1019 return error;
1020
1021 ip->i_entries = 0;
1022 inode->i_ctime = CURRENT_TIME;
1023 if (S_ISDIR(inode->i_mode))
1024 clear_nlink(inode);
1025 else
1026 drop_nlink(inode);
1027 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1028 gfs2_dinode_out(ip, bh->b_data);
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
1047static 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 buffer_head *bh;
1054 struct gfs2_holder ghs[3];
1055 struct gfs2_rgrpd *rgd;
1056 struct gfs2_holder ri_gh;
1057 int error;
1058
1059 error = gfs2_rindex_hold(sdp, &ri_gh);
1060 if (error)
1061 return error;
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);
1067 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1068
1069
1070 error = gfs2_glock_nq(ghs); /* parent */
1071 if (error)
1072 goto out_parent;
1073
1074 error = gfs2_glock_nq(ghs + 1); /* child */
1075 if (error)
1076 goto out_child;
1077
1078 error = -ENOENT;
1079 if (inode->i_nlink == 0)
1080 goto out_rgrp;
1081
1082 if (S_ISDIR(inode->i_mode)) {
1083 error = -ENOTEMPTY;
1084 if (ip->i_entries > 2 || inode->i_nlink > 2)
1085 goto out_rgrp;
1086 }
1087
1088 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1089 if (error)
1090 goto out_rgrp;
1091
1092 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1093 if (error)
1094 goto out_gunlock;
1095
1096 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1097 if (error)
1098 goto out_gunlock;
1099
1100 error = gfs2_meta_inode_buffer(ip, &bh);
1101 if (error)
1102 goto out_end_trans;
1103
1104 error = gfs2_unlink_inode(dip, dentry, bh);
1105 brelse(bh);
1106
1107out_end_trans:
1108 gfs2_trans_end(sdp);
1109out_gunlock:
1110 gfs2_glock_dq(ghs + 2);
1111out_rgrp:
1112 gfs2_holder_uninit(ghs + 2);
1113 gfs2_glock_dq(ghs + 1);
1114out_child:
1115 gfs2_holder_uninit(ghs + 1);
1116 gfs2_glock_dq(ghs);
1117out_parent:
1118 gfs2_holder_uninit(ghs);
1119 gfs2_glock_dq_uninit(&ri_gh);
1120 return error;
1121}
1122
1123/**
1124 * gfs2_symlink - Create a symlink
1125 * @dir: The directory to create the symlink in
1126 * @dentry: The dentry to put the symlink in
1127 * @symname: The thing which the link points to
1128 *
1129 * Returns: errno
1130 */
1131
1132static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1133 const char *symname)
1134{
1135 struct gfs2_sbd *sdp = GFS2_SB(dir);
1136 unsigned int size;
1137
1138 size = strlen(symname);
1139 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1140 return -ENAMETOOLONG;
1141
1142 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size);
1143}
1144
1145/**
1146 * gfs2_mkdir - Make a directory
1147 * @dir: The parent directory of the new one
1148 * @dentry: The dentry of the new directory
1149 * @mode: The mode of the new directory
1150 *
1151 * Returns: errno
1152 */
1153
1154static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1155{
1156 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0);
1157}
1158
1159/**
1160 * gfs2_mknod - Make a special file
1161 * @dir: The directory in which the special file will reside
1162 * @dentry: The dentry of the special file
1163 * @mode: The mode of the special file
1164 * @dev: The device specification of the special file
1165 *
1166 */
1167
1168static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1169 dev_t dev)
1170{
1171 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0);
1172}
1173
1174/*
1175 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1176 * @this: move this
1177 * @to: to here
1178 *
1179 * Follow @to back to the root and make sure we don't encounter @this
1180 * Assumes we already hold the rename lock.
1181 *
1182 * Returns: errno
1183 */
1184
1185static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1186{
1187 struct inode *dir = &to->i_inode;
1188 struct super_block *sb = dir->i_sb;
1189 struct inode *tmp;
1190 int error = 0;
1191
1192 igrab(dir);
1193
1194 for (;;) {
1195 if (dir == &this->i_inode) {
1196 error = -EINVAL;
1197 break;
1198 }
1199 if (dir == sb->s_root->d_inode) {
1200 error = 0;
1201 break;
1202 }
1203
1204 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1205 if (IS_ERR(tmp)) {
1206 error = PTR_ERR(tmp);
1207 break;
1208 }
1209
1210 iput(dir);
1211 dir = tmp;
1212 }
1213
1214 iput(dir);
1215
1216 return error;
1217}
1218
1219/**
1220 * gfs2_rename - Rename a file
1221 * @odir: Parent directory of old file name
1222 * @odentry: The old dentry of the file
1223 * @ndir: Parent directory of new file name
1224 * @ndentry: The new dentry of the file
1225 *
1226 * Returns: errno
1227 */
1228
1229static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1230 struct inode *ndir, struct dentry *ndentry)
1231{
1232 struct gfs2_inode *odip = GFS2_I(odir);
1233 struct gfs2_inode *ndip = GFS2_I(ndir);
1234 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1235 struct gfs2_inode *nip = NULL;
1236 struct gfs2_sbd *sdp = GFS2_SB(odir);
1237 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1238 struct gfs2_rgrpd *nrgd;
1239 unsigned int num_gh;
1240 int dir_rename = 0;
1241 int alloc_required = 0;
1242 unsigned int x;
1243 int error;
1244
1245 if (ndentry->d_inode) {
1246 nip = GFS2_I(ndentry->d_inode);
1247 if (ip == nip)
1248 return 0;
1249 }
1250
1251 error = gfs2_rindex_hold(sdp, &ri_gh);
1252 if (error)
1253 return error;
1254
1255 if (odip != ndip) {
1256 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1257 0, &r_gh);
1258 if (error)
1259 goto out;
1260
1261 if (S_ISDIR(ip->i_inode.i_mode)) {
1262 dir_rename = 1;
1263 /* don't move a dirctory into it's subdir */
1264 error = gfs2_ok_to_move(ip, ndip);
1265 if (error)
1266 goto out_gunlock_r;
1267 }
1268 }
1269
1270 num_gh = 1;
1271 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1272 if (odip != ndip) {
1273 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1274 num_gh++;
1275 }
1276 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1277 num_gh++;
1278
1279 if (nip) {
1280 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1281 num_gh++;
1282 /* grab the resource lock for unlink flag twiddling
1283 * this is the case of the target file already existing
1284 * so we unlink before doing the rename
1285 */
1286 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1287 if (nrgd)
1288 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1289 }
1290
1291 for (x = 0; x < num_gh; x++) {
1292 error = gfs2_glock_nq(ghs + x);
1293 if (error)
1294 goto out_gunlock;
1295 }
1296
1297 error = -ENOENT;
1298 if (ip->i_inode.i_nlink == 0)
1299 goto out_gunlock;
1300
1301 /* Check out the old directory */
1302
1303 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1304 if (error)
1305 goto out_gunlock;
1306
1307 /* Check out the new directory */
1308
1309 if (nip) {
1310 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1311 if (error)
1312 goto out_gunlock;
1313
1314 if (nip->i_inode.i_nlink == 0) {
1315 error = -EAGAIN;
1316 goto out_gunlock;
1317 }
1318
1319 if (S_ISDIR(nip->i_inode.i_mode)) {
1320 if (nip->i_entries < 2) {
1321 gfs2_consist_inode(nip);
1322 error = -EIO;
1323 goto out_gunlock;
1324 }
1325 if (nip->i_entries > 2) {
1326 error = -ENOTEMPTY;
1327 goto out_gunlock;
1328 }
1329 }
1330 } else {
1331 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1332 if (error)
1333 goto out_gunlock;
1334
1335 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1336 switch (error) {
1337 case -ENOENT:
1338 error = 0;
1339 break;
1340 case 0:
1341 error = -EEXIST;
1342 default:
1343 goto out_gunlock;
1344 };
1345
1346 if (odip != ndip) {
1347 if (!ndip->i_inode.i_nlink) {
1348 error = -ENOENT;
1349 goto out_gunlock;
1350 }
1351 if (ndip->i_entries == (u32)-1) {
1352 error = -EFBIG;
1353 goto out_gunlock;
1354 }
1355 if (S_ISDIR(ip->i_inode.i_mode) &&
1356 ndip->i_inode.i_nlink == (u32)-1) {
1357 error = -EMLINK;
1358 goto out_gunlock;
1359 }
1360 }
1361 }
1362
1363 /* Check out the dir to be renamed */
1364
1365 if (dir_rename) {
1366 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1367 if (error)
1368 goto out_gunlock;
1369 }
1370
1371 if (nip == NULL)
1372 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1373 error = alloc_required;
1374 if (error < 0)
1375 goto out_gunlock;
1376 error = 0;
1377
1378 if (alloc_required) {
1379 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1380 if (!al) {
1381 error = -ENOMEM;
1382 goto out_gunlock;
1383 }
1384
1385 error = gfs2_quota_lock_check(ndip);
1386 if (error)
1387 goto out_alloc;
1388
1389 al->al_requested = sdp->sd_max_dirres;
1390
1391 error = gfs2_inplace_reserve_ri(ndip);
1392 if (error)
1393 goto out_gunlock_q;
1394
1395 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1396 gfs2_rg_blocks(al) +
1397 4 * RES_DINODE + 4 * RES_LEAF +
1398 RES_STATFS + RES_QUOTA + 4, 0);
1399 if (error)
1400 goto out_ipreserv;
1401 } else {
1402 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1403 5 * RES_LEAF + 4, 0);
1404 if (error)
1405 goto out_gunlock;
1406 }
1407
1408 /* Remove the target file, if it exists */
1409
1410 if (nip) {
1411 struct buffer_head *bh;
1412 error = gfs2_meta_inode_buffer(nip, &bh);
1413 if (error)
1414 goto out_end_trans;
1415 error = gfs2_unlink_inode(ndip, ndentry, bh);
1416 brelse(bh);
1417 }
1418
1419 if (dir_rename) {
1420 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1421 if (error)
1422 goto out_end_trans;
1423 } else {
1424 struct buffer_head *dibh;
1425 error = gfs2_meta_inode_buffer(ip, &dibh);
1426 if (error)
1427 goto out_end_trans;
1428 ip->i_inode.i_ctime = CURRENT_TIME;
1429 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1430 gfs2_dinode_out(ip, dibh->b_data);
1431 brelse(dibh);
1432 }
1433
1434 error = gfs2_dir_del(odip, odentry);
1435 if (error)
1436 goto out_end_trans;
1437
1438 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1439 if (error)
1440 goto out_end_trans;
1441
1442out_end_trans:
1443 gfs2_trans_end(sdp);
1444out_ipreserv:
1445 if (alloc_required)
1446 gfs2_inplace_release(ndip);
1447out_gunlock_q:
1448 if (alloc_required)
1449 gfs2_quota_unlock(ndip);
1450out_alloc:
1451 if (alloc_required)
1452 gfs2_alloc_put(ndip);
1453out_gunlock:
1454 while (x--) {
1455 gfs2_glock_dq(ghs + x);
1456 gfs2_holder_uninit(ghs + x);
1457 }
1458out_gunlock_r:
1459 if (r_gh.gh_gl)
1460 gfs2_glock_dq_uninit(&r_gh);
1461out:
1462 gfs2_glock_dq_uninit(&ri_gh);
1463 return error;
1464}
1465
1466/**
1467 * gfs2_follow_link - Follow a symbolic link
1468 * @dentry: The dentry of the link
1469 * @nd: Data that we pass to vfs_follow_link()
1470 *
1471 * This can handle symlinks of any size.
1472 *
1473 * Returns: 0 on success or error code
1474 */
1475
1476static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1477{
1478 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1479 struct gfs2_holder i_gh;
1480 struct buffer_head *dibh;
1481 unsigned int size;
1482 char *buf;
1483 int error;
1484
1485 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1486 error = gfs2_glock_nq(&i_gh);
1487 if (error) {
1488 gfs2_holder_uninit(&i_gh);
1489 nd_set_link(nd, ERR_PTR(error));
1490 return NULL;
1491 }
1492
1493 size = (unsigned int)i_size_read(&ip->i_inode);
1494 if (size == 0) {
1495 gfs2_consist_inode(ip);
1496 buf = ERR_PTR(-EIO);
1497 goto out;
1498 }
1499
1500 error = gfs2_meta_inode_buffer(ip, &dibh);
1501 if (error) {
1502 buf = ERR_PTR(error);
1503 goto out;
1504 }
1505
1506 buf = kzalloc(size + 1, GFP_NOFS);
1507 if (!buf)
1508 buf = ERR_PTR(-ENOMEM);
1509 else
1510 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1511 brelse(dibh);
1512out:
1513 gfs2_glock_dq_uninit(&i_gh);
1514 nd_set_link(nd, buf);
1515 return NULL;
1516}
1517
1518static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1519{
1520 char *s = nd_get_link(nd);
1521 if (!IS_ERR(s))
1522 kfree(s);
1523}
1524
1525/**
1526 * gfs2_permission -
1527 * @inode: The inode
1528 * @mask: The mask to be tested
1529 * @flags: Indicates whether this is an RCU path walk or not
1530 *
1531 * This may be called from the VFS directly, or from within GFS2 with the
1532 * inode locked, so we look to see if the glock is already locked and only
1533 * lock the glock if its not already been done.
1534 *
1535 * Returns: errno
1536 */
1537
1538int gfs2_permission(struct inode *inode, int mask)
1539{
1540 struct gfs2_inode *ip;
1541 struct gfs2_holder i_gh;
1542 int error;
1543 int unlock = 0;
1544
1545
1546 ip = GFS2_I(inode);
1547 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1548 if (mask & MAY_NOT_BLOCK)
1549 return -ECHILD;
1550 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1551 if (error)
1552 return error;
1553 unlock = 1;
1554 }
1555
1556 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1557 error = -EACCES;
1558 else
1559 error = generic_permission(inode, mask);
1560 if (unlock)
1561 gfs2_glock_dq_uninit(&i_gh);
1562
1563 return error;
1564}
1565
1566static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1567{
1568 struct inode *inode = &ip->i_inode;
1569 struct buffer_head *dibh;
1570 int error;
1571
1572 error = gfs2_meta_inode_buffer(ip, &dibh);
1573 if (error)
1574 return error;
1575
1576 setattr_copy(inode, attr);
1577 mark_inode_dirty(inode);
1578 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1579 gfs2_dinode_out(ip, dibh->b_data);
1580 brelse(dibh);
1581 return 0;
1582}
1583
1584/**
1585 * gfs2_setattr_simple -
1586 * @ip:
1587 * @attr:
1588 *
1589 * Returns: errno
1590 */
1591
1592int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1593{
1594 int error;
1595
1596 if (current->journal_info)
1597 return __gfs2_setattr_simple(ip, attr);
1598
1599 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1600 if (error)
1601 return error;
1602
1603 error = __gfs2_setattr_simple(ip, attr);
1604 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1605 return error;
1606}
1607
1608static int setattr_chown(struct inode *inode, struct iattr *attr)
1609{
1610 struct gfs2_inode *ip = GFS2_I(inode);
1611 struct gfs2_sbd *sdp = GFS2_SB(inode);
1612 u32 ouid, ogid, nuid, ngid;
1613 int error;
1614
1615 ouid = inode->i_uid;
1616 ogid = inode->i_gid;
1617 nuid = attr->ia_uid;
1618 ngid = attr->ia_gid;
1619
1620 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1621 ouid = nuid = NO_QUOTA_CHANGE;
1622 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1623 ogid = ngid = NO_QUOTA_CHANGE;
1624
1625 if (!gfs2_alloc_get(ip))
1626 return -ENOMEM;
1627
1628 error = gfs2_quota_lock(ip, nuid, ngid);
1629 if (error)
1630 goto out_alloc;
1631
1632 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1633 error = gfs2_quota_check(ip, nuid, ngid);
1634 if (error)
1635 goto out_gunlock_q;
1636 }
1637
1638 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1639 if (error)
1640 goto out_gunlock_q;
1641
1642 error = gfs2_setattr_simple(ip, attr);
1643 if (error)
1644 goto out_end_trans;
1645
1646 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1647 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1648 gfs2_quota_change(ip, -blocks, ouid, ogid);
1649 gfs2_quota_change(ip, blocks, nuid, ngid);
1650 }
1651
1652out_end_trans:
1653 gfs2_trans_end(sdp);
1654out_gunlock_q:
1655 gfs2_quota_unlock(ip);
1656out_alloc:
1657 gfs2_alloc_put(ip);
1658 return error;
1659}
1660
1661/**
1662 * gfs2_setattr - Change attributes on an inode
1663 * @dentry: The dentry which is changing
1664 * @attr: The structure describing the change
1665 *
1666 * The VFS layer wants to change one or more of an inodes attributes. Write
1667 * that change out to disk.
1668 *
1669 * Returns: errno
1670 */
1671
1672static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1673{
1674 struct inode *inode = dentry->d_inode;
1675 struct gfs2_inode *ip = GFS2_I(inode);
1676 struct gfs2_holder i_gh;
1677 int error;
1678
1679 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1680 if (error)
1681 return error;
1682
1683 error = -EPERM;
1684 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1685 goto out;
1686
1687 error = inode_change_ok(inode, attr);
1688 if (error)
1689 goto out;
1690
1691 if (attr->ia_valid & ATTR_SIZE)
1692 error = gfs2_setattr_size(inode, attr->ia_size);
1693 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1694 error = setattr_chown(inode, attr);
1695 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1696 error = gfs2_acl_chmod(ip, attr);
1697 else
1698 error = gfs2_setattr_simple(ip, attr);
1699
1700out:
1701 gfs2_glock_dq_uninit(&i_gh);
1702 if (!error)
1703 mark_inode_dirty(inode);
1704 return error;
1705}
1706
1707/**
1708 * gfs2_getattr - Read out an inode's attributes
1709 * @mnt: The vfsmount the inode is being accessed from
1710 * @dentry: The dentry to stat
1711 * @stat: The inode's stats
1712 *
1713 * This may be called from the VFS directly, or from within GFS2 with the
1714 * inode locked, so we look to see if the glock is already locked and only
1715 * lock the glock if its not already been done. Note that its the NFS
1716 * readdirplus operation which causes this to be called (from filldir)
1717 * with the glock already held.
1718 *
1719 * Returns: errno
1720 */
1721
1722static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1723 struct kstat *stat)
1724{
1725 struct inode *inode = dentry->d_inode;
1726 struct gfs2_inode *ip = GFS2_I(inode);
1727 struct gfs2_holder gh;
1728 int error;
1729 int unlock = 0;
1730
1731 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1732 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1733 if (error)
1734 return error;
1735 unlock = 1;
1736 }
1737
1738 generic_fillattr(inode, stat);
1739 if (unlock)
1740 gfs2_glock_dq_uninit(&gh);
1741
1742 return 0;
1743}
1744
1745static int gfs2_setxattr(struct dentry *dentry, const char *name,
1746 const void *data, size_t size, int flags)
1747{
1748 struct inode *inode = dentry->d_inode;
1749 struct gfs2_inode *ip = GFS2_I(inode);
1750 struct gfs2_holder gh;
1751 int ret;
1752
1753 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1754 ret = gfs2_glock_nq(&gh);
1755 if (ret == 0) {
1756 ret = generic_setxattr(dentry, name, data, size, flags);
1757 gfs2_glock_dq(&gh);
1758 }
1759 gfs2_holder_uninit(&gh);
1760 return ret;
1761}
1762
1763static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1764 void *data, size_t size)
1765{
1766 struct inode *inode = dentry->d_inode;
1767 struct gfs2_inode *ip = GFS2_I(inode);
1768 struct gfs2_holder gh;
1769 int ret;
1770
1771 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1772 ret = gfs2_glock_nq(&gh);
1773 if (ret == 0) {
1774 ret = generic_getxattr(dentry, name, data, size);
1775 gfs2_glock_dq(&gh);
1776 }
1777 gfs2_holder_uninit(&gh);
1778 return ret;
1779}
1780
1781static int gfs2_removexattr(struct dentry *dentry, const char *name)
1782{
1783 struct inode *inode = dentry->d_inode;
1784 struct gfs2_inode *ip = GFS2_I(inode);
1785 struct gfs2_holder gh;
1786 int ret;
1787
1788 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1789 ret = gfs2_glock_nq(&gh);
1790 if (ret == 0) {
1791 ret = generic_removexattr(dentry, name);
1792 gfs2_glock_dq(&gh);
1793 }
1794 gfs2_holder_uninit(&gh);
1795 return ret;
1796}
1797
1798static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1799 u64 start, u64 len)
1800{
1801 struct gfs2_inode *ip = GFS2_I(inode);
1802 struct gfs2_holder gh;
1803 int ret;
1804
1805 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1806 if (ret)
1807 return ret;
1808
1809 mutex_lock(&inode->i_mutex);
1810
1811 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1812 if (ret)
1813 goto out;
1814
1815 if (gfs2_is_stuffed(ip)) {
1816 u64 phys = ip->i_no_addr << inode->i_blkbits;
1817 u64 size = i_size_read(inode);
1818 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1819 FIEMAP_EXTENT_DATA_INLINE;
1820 phys += sizeof(struct gfs2_dinode);
1821 phys += start;
1822 if (start + len > size)
1823 len = size - start;
1824 if (start < size)
1825 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1826 len, flags);
1827 if (ret == 1)
1828 ret = 0;
1829 } else {
1830 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1831 gfs2_block_map);
1832 }
1833
1834 gfs2_glock_dq_uninit(&gh);
1835out:
1836 mutex_unlock(&inode->i_mutex);
1837 return ret;
1838}
1839
1840const struct inode_operations gfs2_file_iops = {
1841 .permission = gfs2_permission,
1842 .setattr = gfs2_setattr,
1843 .getattr = gfs2_getattr,
1844 .setxattr = gfs2_setxattr,
1845 .getxattr = gfs2_getxattr,
1846 .listxattr = gfs2_listxattr,
1847 .removexattr = gfs2_removexattr,
1848 .fiemap = gfs2_fiemap,
1849 .get_acl = gfs2_get_acl,
1850};
1851
1852const struct inode_operations gfs2_dir_iops = {
1853 .create = gfs2_create,
1854 .lookup = gfs2_lookup,
1855 .link = gfs2_link,
1856 .unlink = gfs2_unlink,
1857 .symlink = gfs2_symlink,
1858 .mkdir = gfs2_mkdir,
1859 .rmdir = gfs2_unlink,
1860 .mknod = gfs2_mknod,
1861 .rename = gfs2_rename,
1862 .permission = gfs2_permission,
1863 .setattr = gfs2_setattr,
1864 .getattr = gfs2_getattr,
1865 .setxattr = gfs2_setxattr,
1866 .getxattr = gfs2_getxattr,
1867 .listxattr = gfs2_listxattr,
1868 .removexattr = gfs2_removexattr,
1869 .fiemap = gfs2_fiemap,
1870 .get_acl = gfs2_get_acl,
1871};
1872
1873const struct inode_operations gfs2_symlink_iops = {
1874 .readlink = generic_readlink,
1875 .follow_link = gfs2_follow_link,
1876 .put_link = gfs2_put_link,
1877 .permission = gfs2_permission,
1878 .setattr = gfs2_setattr,
1879 .getattr = gfs2_getattr,
1880 .setxattr = gfs2_setxattr,
1881 .getxattr = gfs2_getxattr,
1882 .listxattr = gfs2_listxattr,
1883 .removexattr = gfs2_removexattr,
1884 .fiemap = gfs2_fiemap,
1885 .get_acl = gfs2_get_acl,
1886};
1887
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
40struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44};
45
46static 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
62static 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
74struct 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
85static 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
105static 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
140struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142{
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOMEM);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191fail_refresh:
192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204}
205
206struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208{
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244fail_iput:
245 iput(inode);
246 goto fail;
247}
248
249
250struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251{
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265}
266
267
268/**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285{
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == sb->s_root->d_inode)) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name, false);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325}
326
327/**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338{
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355}
356
357static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
359{
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
368 } else
369 inode->i_uid = current_fsuid();
370
371 if (dip->i_inode.i_mode & S_ISGID) {
372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
375 } else
376 inode->i_gid = current_fsgid();
377}
378
379static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
380{
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 int error;
384
385 error = gfs2_quota_lock_check(ip);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, &ap);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404out_ipreserv:
405 gfs2_inplace_release(ip);
406out_quota:
407 gfs2_quota_unlock(ip);
408out:
409 return error;
410}
411
412static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414{
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427}
428
429/**
430 * gfs2_init_xattr - Initialise an xattr block for a new inode
431 * @ip: The inode in question
432 *
433 * This sets up an empty xattr block for a new inode, ready to
434 * take any ACLs, LSM xattrs, etc.
435 */
436
437static void gfs2_init_xattr(struct gfs2_inode *ip)
438{
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454}
455
456/**
457 * init_dinode - Fill in a new dinode structure
458 * @dip: The directory this inode is being created in
459 * @ip: The inode
460 * @symname: The symlink destination (if a symlink)
461 * @bhp: The buffer head (returned to caller)
462 *
463 */
464
465static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466 const char *symname)
467{
468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
470
471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472 gfs2_trans_add_meta(ip->i_gl, dibh);
473 di = (struct gfs2_dinode *)dibh->b_data;
474 gfs2_dinode_out(ip, di);
475
476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 di->__pad1 = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484
485 switch(ip->i_inode.i_mode & S_IFMT) {
486 case S_IFDIR:
487 gfs2_init_dir(dibh, dip);
488 break;
489 case S_IFLNK:
490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 break;
492 }
493
494 set_buffer_uptodate(dibh);
495 brelse(dibh);
496}
497
498/**
499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500 * @dip: The directory we are linking into
501 * @da: The dir add information
502 * @nr_inodes: The number of inodes involved
503 *
504 * This calculate the number of blocks we need to reserve in a
505 * transaction to link @nr_inodes into a directory. In most cases
506 * @nr_inodes will be 2 (the directory plus the inode being linked in)
507 * but in case of rename, 4 may be required.
508 *
509 * Returns: Number of blocks
510 */
511
512static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515{
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518}
519
520static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521 struct gfs2_inode *ip, struct gfs2_diradd *da)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 int error;
526
527 if (da->nr_blocks) {
528 error = gfs2_quota_lock_check(dip);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_inplace_reserve(dip, &ap);
533 if (error)
534 goto fail_quota_locks;
535
536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 if (error)
547 goto fail_end_trans;
548
549fail_end_trans:
550 gfs2_trans_end(sdp);
551fail_ipreserv:
552 gfs2_inplace_release(dip);
553fail_quota_locks:
554 gfs2_quota_unlock(dip);
555 return error;
556}
557
558static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
559 void *fs_info)
560{
561 const struct xattr *xattr;
562 int err = 0;
563
564 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
566 xattr->value_len, 0,
567 GFS2_EATYPE_SECURITY);
568 if (err < 0)
569 break;
570 }
571 return err;
572}
573
574/**
575 * gfs2_create_inode - Create a new inode
576 * @dir: The parent directory
577 * @dentry: The new dentry
578 * @file: If non-NULL, the file which is being opened
579 * @mode: The permissions on the new inode
580 * @dev: For device nodes, this is the device number
581 * @symname: For symlinks, this is the link destination
582 * @size: The initial size of the inode (ignored for directories)
583 *
584 * Returns: 0 on success, or error code
585 */
586
587static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
588 struct file *file,
589 umode_t mode, dev_t dev, const char *symname,
590 unsigned int size, int excl, int *opened)
591{
592 const struct qstr *name = &dentry->d_name;
593 struct posix_acl *default_acl, *acl;
594 struct gfs2_holder ghs[2];
595 struct inode *inode = NULL;
596 struct gfs2_inode *dip = GFS2_I(dir), *ip;
597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
598 struct gfs2_glock *io_gl;
599 struct dentry *d;
600 int error, free_vfs_inode = 0;
601 u32 aflags = 0;
602 unsigned blocks = 1;
603 struct gfs2_diradd da = { .bh = NULL, };
604
605 if (!name->len || name->len > GFS2_FNAMESIZE)
606 return -ENAMETOOLONG;
607
608 error = gfs2_rs_alloc(dip);
609 if (error)
610 return error;
611
612 error = gfs2_rindex_update(sdp);
613 if (error)
614 return error;
615
616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
617 if (error)
618 goto fail;
619
620 error = create_ok(dip, name, mode);
621 if (error)
622 goto fail_gunlock;
623
624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
625 error = PTR_ERR(inode);
626 if (!IS_ERR(inode)) {
627 d = d_splice_alias(inode, dentry);
628 error = PTR_ERR(d);
629 if (IS_ERR(d))
630 goto fail_gunlock;
631 error = 0;
632 if (file) {
633 if (S_ISREG(inode->i_mode)) {
634 WARN_ON(d != NULL);
635 error = finish_open(file, dentry, gfs2_open_common, opened);
636 } else {
637 error = finish_no_open(file, d);
638 }
639 } else {
640 dput(d);
641 }
642 gfs2_glock_dq_uninit(ghs);
643 return error;
644 } else if (error != -ENOENT) {
645 goto fail_gunlock;
646 }
647
648 error = gfs2_diradd_alloc_required(dir, name, &da);
649 if (error < 0)
650 goto fail_gunlock;
651
652 inode = new_inode(sdp->sd_vfs);
653 error = -ENOMEM;
654 if (!inode)
655 goto fail_gunlock;
656
657 error = posix_acl_create(dir, &mode, &default_acl, &acl);
658 if (error)
659 goto fail_free_vfs_inode;
660
661 ip = GFS2_I(inode);
662 error = gfs2_rs_alloc(ip);
663 if (error)
664 goto fail_free_acls;
665
666 inode->i_mode = mode;
667 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
668 inode->i_rdev = dev;
669 inode->i_size = size;
670 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
671 gfs2_set_inode_blocks(inode, 1);
672 munge_mode_uid_gid(dip, inode);
673 ip->i_goal = dip->i_goal;
674 ip->i_diskflags = 0;
675 ip->i_eattr = 0;
676 ip->i_height = 0;
677 ip->i_depth = 0;
678 ip->i_entries = 0;
679
680 switch(mode & S_IFMT) {
681 case S_IFREG:
682 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
683 gfs2_tune_get(sdp, gt_new_files_jdata))
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 gfs2_set_aops(inode);
686 break;
687 case S_IFDIR:
688 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
689 ip->i_diskflags |= GFS2_DIF_JDATA;
690 ip->i_entries = 2;
691 break;
692 }
693 gfs2_set_inode_flags(inode);
694
695 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
696 (dip->i_diskflags & GFS2_DIF_TOPDIR))
697 aflags |= GFS2_AF_ORLOV;
698
699 if (default_acl || acl)
700 blocks++;
701
702 error = alloc_dinode(ip, aflags, &blocks);
703 if (error)
704 goto fail_free_inode;
705
706 gfs2_set_inode_blocks(inode, blocks);
707
708 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709 if (error)
710 goto fail_free_inode;
711
712 ip->i_gl->gl_object = ip;
713 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
714 if (error)
715 goto fail_free_inode;
716
717 error = gfs2_trans_begin(sdp, blocks, 0);
718 if (error)
719 goto fail_gunlock2;
720
721 if (blocks > 1) {
722 ip->i_eattr = ip->i_no_addr + 1;
723 gfs2_init_xattr(ip);
724 }
725 init_dinode(dip, ip, symname);
726 gfs2_trans_end(sdp);
727
728 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
729 if (error)
730 goto fail_gunlock2;
731
732 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
733 if (error)
734 goto fail_gunlock2;
735
736 ip->i_iopen_gh.gh_gl->gl_object = ip;
737 gfs2_glock_put(io_gl);
738 gfs2_set_iop(inode);
739 insert_inode_hash(inode);
740
741 if (default_acl) {
742 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
743 posix_acl_release(default_acl);
744 }
745 if (acl) {
746 if (!error)
747 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
748 posix_acl_release(acl);
749 }
750
751 if (error)
752 goto fail_gunlock3;
753
754 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
755 &gfs2_initxattrs, NULL);
756 if (error)
757 goto fail_gunlock3;
758
759 error = link_dinode(dip, name, ip, &da);
760 if (error)
761 goto fail_gunlock3;
762
763 mark_inode_dirty(inode);
764 d_instantiate(dentry, inode);
765 if (file) {
766 *opened |= FILE_CREATED;
767 error = finish_open(file, dentry, gfs2_open_common, opened);
768 }
769 gfs2_glock_dq_uninit(ghs);
770 gfs2_glock_dq_uninit(ghs + 1);
771 return error;
772
773fail_gunlock3:
774 gfs2_glock_dq_uninit(ghs + 1);
775 if (ip->i_gl)
776 gfs2_glock_put(ip->i_gl);
777 goto fail_gunlock;
778
779fail_gunlock2:
780 gfs2_glock_dq_uninit(ghs + 1);
781fail_free_inode:
782 if (ip->i_gl)
783 gfs2_glock_put(ip->i_gl);
784 gfs2_rs_delete(ip, NULL);
785fail_free_acls:
786 if (default_acl)
787 posix_acl_release(default_acl);
788 if (acl)
789 posix_acl_release(acl);
790fail_free_vfs_inode:
791 free_vfs_inode = 1;
792fail_gunlock:
793 gfs2_dir_no_add(&da);
794 gfs2_glock_dq_uninit(ghs);
795 if (inode && !IS_ERR(inode)) {
796 clear_nlink(inode);
797 if (!free_vfs_inode)
798 mark_inode_dirty(inode);
799 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
800 &GFS2_I(inode)->i_flags);
801 iput(inode);
802 }
803fail:
804 return error;
805}
806
807/**
808 * gfs2_create - Create a file
809 * @dir: The directory in which to create the file
810 * @dentry: The dentry of the new file
811 * @mode: The mode of the new file
812 *
813 * Returns: errno
814 */
815
816static int gfs2_create(struct inode *dir, struct dentry *dentry,
817 umode_t mode, bool excl)
818{
819 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
820}
821
822/**
823 * __gfs2_lookup - Look up a filename in a directory and return its inode
824 * @dir: The directory inode
825 * @dentry: The dentry of the new inode
826 * @file: File to be opened
827 * @opened: atomic_open flags
828 *
829 *
830 * Returns: errno
831 */
832
833static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
834 struct file *file, int *opened)
835{
836 struct inode *inode;
837 struct dentry *d;
838 struct gfs2_holder gh;
839 struct gfs2_glock *gl;
840 int error;
841
842 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
843 if (!inode)
844 return NULL;
845 if (IS_ERR(inode))
846 return ERR_CAST(inode);
847
848 gl = GFS2_I(inode)->i_gl;
849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
850 if (error) {
851 iput(inode);
852 return ERR_PTR(error);
853 }
854
855 d = d_splice_alias(inode, dentry);
856 if (IS_ERR(d)) {
857 iput(inode);
858 gfs2_glock_dq_uninit(&gh);
859 return d;
860 }
861 if (file && S_ISREG(inode->i_mode))
862 error = finish_open(file, dentry, gfs2_open_common, opened);
863
864 gfs2_glock_dq_uninit(&gh);
865 if (error) {
866 dput(d);
867 return ERR_PTR(error);
868 }
869 return d;
870}
871
872static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
873 unsigned flags)
874{
875 return __gfs2_lookup(dir, dentry, NULL, NULL);
876}
877
878/**
879 * gfs2_link - Link to a file
880 * @old_dentry: The inode to link
881 * @dir: Add link to this directory
882 * @dentry: The name of the link
883 *
884 * Link the inode in "old_dentry" into the directory "dir" with the
885 * name in "dentry".
886 *
887 * Returns: errno
888 */
889
890static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
891 struct dentry *dentry)
892{
893 struct gfs2_inode *dip = GFS2_I(dir);
894 struct gfs2_sbd *sdp = GFS2_SB(dir);
895 struct inode *inode = old_dentry->d_inode;
896 struct gfs2_inode *ip = GFS2_I(inode);
897 struct gfs2_holder ghs[2];
898 struct buffer_head *dibh;
899 struct gfs2_diradd da = { .bh = NULL, };
900 int error;
901
902 if (S_ISDIR(inode->i_mode))
903 return -EPERM;
904
905 error = gfs2_rs_alloc(dip);
906 if (error)
907 return error;
908
909 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
910 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
911
912 error = gfs2_glock_nq(ghs); /* parent */
913 if (error)
914 goto out_parent;
915
916 error = gfs2_glock_nq(ghs + 1); /* child */
917 if (error)
918 goto out_child;
919
920 error = -ENOENT;
921 if (inode->i_nlink == 0)
922 goto out_gunlock;
923
924 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
925 if (error)
926 goto out_gunlock;
927
928 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
929 switch (error) {
930 case -ENOENT:
931 break;
932 case 0:
933 error = -EEXIST;
934 default:
935 goto out_gunlock;
936 }
937
938 error = -EINVAL;
939 if (!dip->i_inode.i_nlink)
940 goto out_gunlock;
941 error = -EFBIG;
942 if (dip->i_entries == (u32)-1)
943 goto out_gunlock;
944 error = -EPERM;
945 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
946 goto out_gunlock;
947 error = -EINVAL;
948 if (!ip->i_inode.i_nlink)
949 goto out_gunlock;
950 error = -EMLINK;
951 if (ip->i_inode.i_nlink == (u32)-1)
952 goto out_gunlock;
953
954 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
955 if (error < 0)
956 goto out_gunlock;
957
958 if (da.nr_blocks) {
959 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
960 error = gfs2_quota_lock_check(dip);
961 if (error)
962 goto out_gunlock;
963
964 error = gfs2_inplace_reserve(dip, &ap);
965 if (error)
966 goto out_gunlock_q;
967
968 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
969 if (error)
970 goto out_ipres;
971 } else {
972 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
973 if (error)
974 goto out_ipres;
975 }
976
977 error = gfs2_meta_inode_buffer(ip, &dibh);
978 if (error)
979 goto out_end_trans;
980
981 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
982 if (error)
983 goto out_brelse;
984
985 gfs2_trans_add_meta(ip->i_gl, dibh);
986 inc_nlink(&ip->i_inode);
987 ip->i_inode.i_ctime = CURRENT_TIME;
988 ihold(inode);
989 d_instantiate(dentry, inode);
990 mark_inode_dirty(inode);
991
992out_brelse:
993 brelse(dibh);
994out_end_trans:
995 gfs2_trans_end(sdp);
996out_ipres:
997 if (da.nr_blocks)
998 gfs2_inplace_release(dip);
999out_gunlock_q:
1000 if (da.nr_blocks)
1001 gfs2_quota_unlock(dip);
1002out_gunlock:
1003 gfs2_dir_no_add(&da);
1004 gfs2_glock_dq(ghs + 1);
1005out_child:
1006 gfs2_glock_dq(ghs);
1007out_parent:
1008 gfs2_holder_uninit(ghs);
1009 gfs2_holder_uninit(ghs + 1);
1010 return error;
1011}
1012
1013/*
1014 * gfs2_unlink_ok - check to see that a inode is still in a directory
1015 * @dip: the directory
1016 * @name: the name of the file
1017 * @ip: the inode
1018 *
1019 * Assumes that the lock on (at least) @dip is held.
1020 *
1021 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1022 */
1023
1024static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1025 const struct gfs2_inode *ip)
1026{
1027 int error;
1028
1029 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1030 return -EPERM;
1031
1032 if ((dip->i_inode.i_mode & S_ISVTX) &&
1033 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1034 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1035 return -EPERM;
1036
1037 if (IS_APPEND(&dip->i_inode))
1038 return -EPERM;
1039
1040 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1041 if (error)
1042 return error;
1043
1044 error = gfs2_dir_check(&dip->i_inode, name, ip);
1045 if (error)
1046 return error;
1047
1048 return 0;
1049}
1050
1051/**
1052 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1053 * @dip: The parent directory
1054 * @name: The name of the entry in the parent directory
1055 * @inode: The inode to be removed
1056 *
1057 * Called with all the locks and in a transaction. This will only be
1058 * called for a directory after it has been checked to ensure it is empty.
1059 *
1060 * Returns: 0 on success, or an error
1061 */
1062
1063static int gfs2_unlink_inode(struct gfs2_inode *dip,
1064 const struct dentry *dentry)
1065{
1066 struct inode *inode = dentry->d_inode;
1067 struct gfs2_inode *ip = GFS2_I(inode);
1068 int error;
1069
1070 error = gfs2_dir_del(dip, dentry);
1071 if (error)
1072 return error;
1073
1074 ip->i_entries = 0;
1075 inode->i_ctime = CURRENT_TIME;
1076 if (S_ISDIR(inode->i_mode))
1077 clear_nlink(inode);
1078 else
1079 drop_nlink(inode);
1080 mark_inode_dirty(inode);
1081 if (inode->i_nlink == 0)
1082 gfs2_unlink_di(inode);
1083 return 0;
1084}
1085
1086
1087/**
1088 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1089 * @dir: The inode of the directory containing the inode to unlink
1090 * @dentry: The file itself
1091 *
1092 * This routine uses the type of the inode as a flag to figure out
1093 * whether this is an unlink or an rmdir.
1094 *
1095 * Returns: errno
1096 */
1097
1098static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1099{
1100 struct gfs2_inode *dip = GFS2_I(dir);
1101 struct gfs2_sbd *sdp = GFS2_SB(dir);
1102 struct inode *inode = dentry->d_inode;
1103 struct gfs2_inode *ip = GFS2_I(inode);
1104 struct gfs2_holder ghs[3];
1105 struct gfs2_rgrpd *rgd;
1106 int error;
1107
1108 error = gfs2_rindex_update(sdp);
1109 if (error)
1110 return error;
1111
1112 error = -EROFS;
1113
1114 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1115 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1116
1117 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1118 if (!rgd)
1119 goto out_inodes;
1120
1121 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1122
1123
1124 error = gfs2_glock_nq(ghs); /* parent */
1125 if (error)
1126 goto out_parent;
1127
1128 error = gfs2_glock_nq(ghs + 1); /* child */
1129 if (error)
1130 goto out_child;
1131
1132 error = -ENOENT;
1133 if (inode->i_nlink == 0)
1134 goto out_rgrp;
1135
1136 if (S_ISDIR(inode->i_mode)) {
1137 error = -ENOTEMPTY;
1138 if (ip->i_entries > 2 || inode->i_nlink > 2)
1139 goto out_rgrp;
1140 }
1141
1142 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1143 if (error)
1144 goto out_rgrp;
1145
1146 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1147 if (error)
1148 goto out_gunlock;
1149
1150 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1151 if (error)
1152 goto out_end_trans;
1153
1154 error = gfs2_unlink_inode(dip, dentry);
1155
1156out_end_trans:
1157 gfs2_trans_end(sdp);
1158out_gunlock:
1159 gfs2_glock_dq(ghs + 2);
1160out_rgrp:
1161 gfs2_glock_dq(ghs + 1);
1162out_child:
1163 gfs2_glock_dq(ghs);
1164out_parent:
1165 gfs2_holder_uninit(ghs + 2);
1166out_inodes:
1167 gfs2_holder_uninit(ghs + 1);
1168 gfs2_holder_uninit(ghs);
1169 return error;
1170}
1171
1172/**
1173 * gfs2_symlink - Create a symlink
1174 * @dir: The directory to create the symlink in
1175 * @dentry: The dentry to put the symlink in
1176 * @symname: The thing which the link points to
1177 *
1178 * Returns: errno
1179 */
1180
1181static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1182 const char *symname)
1183{
1184 struct gfs2_sbd *sdp = GFS2_SB(dir);
1185 unsigned int size;
1186
1187 size = strlen(symname);
1188 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1189 return -ENAMETOOLONG;
1190
1191 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1192}
1193
1194/**
1195 * gfs2_mkdir - Make a directory
1196 * @dir: The parent directory of the new one
1197 * @dentry: The dentry of the new directory
1198 * @mode: The mode of the new directory
1199 *
1200 * Returns: errno
1201 */
1202
1203static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1204{
1205 struct gfs2_sbd *sdp = GFS2_SB(dir);
1206 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1207 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1208}
1209
1210/**
1211 * gfs2_mknod - Make a special file
1212 * @dir: The directory in which the special file will reside
1213 * @dentry: The dentry of the special file
1214 * @mode: The mode of the special file
1215 * @dev: The device specification of the special file
1216 *
1217 */
1218
1219static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1220 dev_t dev)
1221{
1222 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1223}
1224
1225/**
1226 * gfs2_atomic_open - Atomically open a file
1227 * @dir: The directory
1228 * @dentry: The proposed new entry
1229 * @file: The proposed new struct file
1230 * @flags: open flags
1231 * @mode: File mode
1232 * @opened: Flag to say whether the file has been opened or not
1233 *
1234 * Returns: error code or 0 for success
1235 */
1236
1237static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238 struct file *file, unsigned flags,
1239 umode_t mode, int *opened)
1240{
1241 struct dentry *d;
1242 bool excl = !!(flags & O_EXCL);
1243
1244 d = __gfs2_lookup(dir, dentry, file, opened);
1245 if (IS_ERR(d))
1246 return PTR_ERR(d);
1247 if (d != NULL)
1248 dentry = d;
1249 if (dentry->d_inode) {
1250 if (!(*opened & FILE_OPENED)) {
1251 if (d == NULL)
1252 dget(dentry);
1253 return finish_no_open(file, dentry);
1254 }
1255 dput(d);
1256 return 0;
1257 }
1258
1259 BUG_ON(d != NULL);
1260 if (!(flags & O_CREAT))
1261 return -ENOENT;
1262
1263 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1264}
1265
1266/*
1267 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1268 * @this: move this
1269 * @to: to here
1270 *
1271 * Follow @to back to the root and make sure we don't encounter @this
1272 * Assumes we already hold the rename lock.
1273 *
1274 * Returns: errno
1275 */
1276
1277static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1278{
1279 struct inode *dir = &to->i_inode;
1280 struct super_block *sb = dir->i_sb;
1281 struct inode *tmp;
1282 int error = 0;
1283
1284 igrab(dir);
1285
1286 for (;;) {
1287 if (dir == &this->i_inode) {
1288 error = -EINVAL;
1289 break;
1290 }
1291 if (dir == sb->s_root->d_inode) {
1292 error = 0;
1293 break;
1294 }
1295
1296 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1297 if (!tmp) {
1298 error = -ENOENT;
1299 break;
1300 }
1301 if (IS_ERR(tmp)) {
1302 error = PTR_ERR(tmp);
1303 break;
1304 }
1305
1306 iput(dir);
1307 dir = tmp;
1308 }
1309
1310 iput(dir);
1311
1312 return error;
1313}
1314
1315/**
1316 * gfs2_rename - Rename a file
1317 * @odir: Parent directory of old file name
1318 * @odentry: The old dentry of the file
1319 * @ndir: Parent directory of new file name
1320 * @ndentry: The new dentry of the file
1321 *
1322 * Returns: errno
1323 */
1324
1325static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1326 struct inode *ndir, struct dentry *ndentry)
1327{
1328 struct gfs2_inode *odip = GFS2_I(odir);
1329 struct gfs2_inode *ndip = GFS2_I(ndir);
1330 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1331 struct gfs2_inode *nip = NULL;
1332 struct gfs2_sbd *sdp = GFS2_SB(odir);
1333 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1334 struct gfs2_rgrpd *nrgd;
1335 unsigned int num_gh;
1336 int dir_rename = 0;
1337 struct gfs2_diradd da = { .nr_blocks = 0, };
1338 unsigned int x;
1339 int error;
1340
1341 if (ndentry->d_inode) {
1342 nip = GFS2_I(ndentry->d_inode);
1343 if (ip == nip)
1344 return 0;
1345 }
1346
1347 error = gfs2_rindex_update(sdp);
1348 if (error)
1349 return error;
1350
1351 error = gfs2_rs_alloc(ndip);
1352 if (error)
1353 return error;
1354
1355 if (odip != ndip) {
1356 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1357 0, &r_gh);
1358 if (error)
1359 goto out;
1360
1361 if (S_ISDIR(ip->i_inode.i_mode)) {
1362 dir_rename = 1;
1363 /* don't move a dirctory into it's subdir */
1364 error = gfs2_ok_to_move(ip, ndip);
1365 if (error)
1366 goto out_gunlock_r;
1367 }
1368 }
1369
1370 num_gh = 1;
1371 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1372 if (odip != ndip) {
1373 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1374 num_gh++;
1375 }
1376 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1377 num_gh++;
1378
1379 if (nip) {
1380 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1381 num_gh++;
1382 /* grab the resource lock for unlink flag twiddling
1383 * this is the case of the target file already existing
1384 * so we unlink before doing the rename
1385 */
1386 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1387 if (nrgd)
1388 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1389 }
1390
1391 for (x = 0; x < num_gh; x++) {
1392 error = gfs2_glock_nq(ghs + x);
1393 if (error)
1394 goto out_gunlock;
1395 }
1396
1397 error = -ENOENT;
1398 if (ip->i_inode.i_nlink == 0)
1399 goto out_gunlock;
1400
1401 /* Check out the old directory */
1402
1403 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1404 if (error)
1405 goto out_gunlock;
1406
1407 /* Check out the new directory */
1408
1409 if (nip) {
1410 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1411 if (error)
1412 goto out_gunlock;
1413
1414 if (nip->i_inode.i_nlink == 0) {
1415 error = -EAGAIN;
1416 goto out_gunlock;
1417 }
1418
1419 if (S_ISDIR(nip->i_inode.i_mode)) {
1420 if (nip->i_entries < 2) {
1421 gfs2_consist_inode(nip);
1422 error = -EIO;
1423 goto out_gunlock;
1424 }
1425 if (nip->i_entries > 2) {
1426 error = -ENOTEMPTY;
1427 goto out_gunlock;
1428 }
1429 }
1430 } else {
1431 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1432 if (error)
1433 goto out_gunlock;
1434
1435 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1436 switch (error) {
1437 case -ENOENT:
1438 error = 0;
1439 break;
1440 case 0:
1441 error = -EEXIST;
1442 default:
1443 goto out_gunlock;
1444 };
1445
1446 if (odip != ndip) {
1447 if (!ndip->i_inode.i_nlink) {
1448 error = -ENOENT;
1449 goto out_gunlock;
1450 }
1451 if (ndip->i_entries == (u32)-1) {
1452 error = -EFBIG;
1453 goto out_gunlock;
1454 }
1455 if (S_ISDIR(ip->i_inode.i_mode) &&
1456 ndip->i_inode.i_nlink == (u32)-1) {
1457 error = -EMLINK;
1458 goto out_gunlock;
1459 }
1460 }
1461 }
1462
1463 /* Check out the dir to be renamed */
1464
1465 if (dir_rename) {
1466 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1467 if (error)
1468 goto out_gunlock;
1469 }
1470
1471 if (nip == NULL) {
1472 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 if (da.nr_blocks) {
1478 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1479 error = gfs2_quota_lock_check(ndip);
1480 if (error)
1481 goto out_gunlock;
1482
1483 error = gfs2_inplace_reserve(ndip, &ap);
1484 if (error)
1485 goto out_gunlock_q;
1486
1487 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1488 4 * RES_LEAF + 4, 0);
1489 if (error)
1490 goto out_ipreserv;
1491 } else {
1492 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1493 5 * RES_LEAF + 4, 0);
1494 if (error)
1495 goto out_gunlock;
1496 }
1497
1498 /* Remove the target file, if it exists */
1499
1500 if (nip)
1501 error = gfs2_unlink_inode(ndip, ndentry);
1502
1503 if (dir_rename) {
1504 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1505 if (error)
1506 goto out_end_trans;
1507 } else {
1508 struct buffer_head *dibh;
1509 error = gfs2_meta_inode_buffer(ip, &dibh);
1510 if (error)
1511 goto out_end_trans;
1512 ip->i_inode.i_ctime = CURRENT_TIME;
1513 gfs2_trans_add_meta(ip->i_gl, dibh);
1514 gfs2_dinode_out(ip, dibh->b_data);
1515 brelse(dibh);
1516 }
1517
1518 error = gfs2_dir_del(odip, odentry);
1519 if (error)
1520 goto out_end_trans;
1521
1522 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1523 if (error)
1524 goto out_end_trans;
1525
1526out_end_trans:
1527 gfs2_trans_end(sdp);
1528out_ipreserv:
1529 if (da.nr_blocks)
1530 gfs2_inplace_release(ndip);
1531out_gunlock_q:
1532 if (da.nr_blocks)
1533 gfs2_quota_unlock(ndip);
1534out_gunlock:
1535 gfs2_dir_no_add(&da);
1536 while (x--) {
1537 gfs2_glock_dq(ghs + x);
1538 gfs2_holder_uninit(ghs + x);
1539 }
1540out_gunlock_r:
1541 if (r_gh.gh_gl)
1542 gfs2_glock_dq_uninit(&r_gh);
1543out:
1544 return error;
1545}
1546
1547/**
1548 * gfs2_follow_link - Follow a symbolic link
1549 * @dentry: The dentry of the link
1550 * @nd: Data that we pass to vfs_follow_link()
1551 *
1552 * This can handle symlinks of any size.
1553 *
1554 * Returns: 0 on success or error code
1555 */
1556
1557static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1558{
1559 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1560 struct gfs2_holder i_gh;
1561 struct buffer_head *dibh;
1562 unsigned int size;
1563 char *buf;
1564 int error;
1565
1566 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1567 error = gfs2_glock_nq(&i_gh);
1568 if (error) {
1569 gfs2_holder_uninit(&i_gh);
1570 nd_set_link(nd, ERR_PTR(error));
1571 return NULL;
1572 }
1573
1574 size = (unsigned int)i_size_read(&ip->i_inode);
1575 if (size == 0) {
1576 gfs2_consist_inode(ip);
1577 buf = ERR_PTR(-EIO);
1578 goto out;
1579 }
1580
1581 error = gfs2_meta_inode_buffer(ip, &dibh);
1582 if (error) {
1583 buf = ERR_PTR(error);
1584 goto out;
1585 }
1586
1587 buf = kzalloc(size + 1, GFP_NOFS);
1588 if (!buf)
1589 buf = ERR_PTR(-ENOMEM);
1590 else
1591 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1592 brelse(dibh);
1593out:
1594 gfs2_glock_dq_uninit(&i_gh);
1595 nd_set_link(nd, buf);
1596 return NULL;
1597}
1598
1599/**
1600 * gfs2_permission -
1601 * @inode: The inode
1602 * @mask: The mask to be tested
1603 * @flags: Indicates whether this is an RCU path walk or not
1604 *
1605 * This may be called from the VFS directly, or from within GFS2 with the
1606 * inode locked, so we look to see if the glock is already locked and only
1607 * lock the glock if its not already been done.
1608 *
1609 * Returns: errno
1610 */
1611
1612int gfs2_permission(struct inode *inode, int mask)
1613{
1614 struct gfs2_inode *ip;
1615 struct gfs2_holder i_gh;
1616 int error;
1617 int unlock = 0;
1618
1619
1620 ip = GFS2_I(inode);
1621 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1622 if (mask & MAY_NOT_BLOCK)
1623 return -ECHILD;
1624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1625 if (error)
1626 return error;
1627 unlock = 1;
1628 }
1629
1630 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1631 error = -EACCES;
1632 else
1633 error = generic_permission(inode, mask);
1634 if (unlock)
1635 gfs2_glock_dq_uninit(&i_gh);
1636
1637 return error;
1638}
1639
1640static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1641{
1642 setattr_copy(inode, attr);
1643 mark_inode_dirty(inode);
1644 return 0;
1645}
1646
1647/**
1648 * gfs2_setattr_simple -
1649 * @ip:
1650 * @attr:
1651 *
1652 * Returns: errno
1653 */
1654
1655int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1656{
1657 int error;
1658
1659 if (current->journal_info)
1660 return __gfs2_setattr_simple(inode, attr);
1661
1662 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1663 if (error)
1664 return error;
1665
1666 error = __gfs2_setattr_simple(inode, attr);
1667 gfs2_trans_end(GFS2_SB(inode));
1668 return error;
1669}
1670
1671static int setattr_chown(struct inode *inode, struct iattr *attr)
1672{
1673 struct gfs2_inode *ip = GFS2_I(inode);
1674 struct gfs2_sbd *sdp = GFS2_SB(inode);
1675 kuid_t ouid, nuid;
1676 kgid_t ogid, ngid;
1677 int error;
1678
1679 ouid = inode->i_uid;
1680 ogid = inode->i_gid;
1681 nuid = attr->ia_uid;
1682 ngid = attr->ia_gid;
1683
1684 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1685 ouid = nuid = NO_UID_QUOTA_CHANGE;
1686 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1687 ogid = ngid = NO_GID_QUOTA_CHANGE;
1688
1689 error = get_write_access(inode);
1690 if (error)
1691 return error;
1692
1693 error = gfs2_rs_alloc(ip);
1694 if (error)
1695 goto out;
1696
1697 error = gfs2_rindex_update(sdp);
1698 if (error)
1699 goto out;
1700
1701 error = gfs2_quota_lock(ip, nuid, ngid);
1702 if (error)
1703 goto out;
1704
1705 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1706 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1707 error = gfs2_quota_check(ip, nuid, ngid);
1708 if (error)
1709 goto out_gunlock_q;
1710 }
1711
1712 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1713 if (error)
1714 goto out_gunlock_q;
1715
1716 error = gfs2_setattr_simple(inode, attr);
1717 if (error)
1718 goto out_end_trans;
1719
1720 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1721 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1722 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1723 gfs2_quota_change(ip, -blocks, ouid, ogid);
1724 gfs2_quota_change(ip, blocks, nuid, ngid);
1725 }
1726
1727out_end_trans:
1728 gfs2_trans_end(sdp);
1729out_gunlock_q:
1730 gfs2_quota_unlock(ip);
1731out:
1732 put_write_access(inode);
1733 return error;
1734}
1735
1736/**
1737 * gfs2_setattr - Change attributes on an inode
1738 * @dentry: The dentry which is changing
1739 * @attr: The structure describing the change
1740 *
1741 * The VFS layer wants to change one or more of an inodes attributes. Write
1742 * that change out to disk.
1743 *
1744 * Returns: errno
1745 */
1746
1747static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1748{
1749 struct inode *inode = dentry->d_inode;
1750 struct gfs2_inode *ip = GFS2_I(inode);
1751 struct gfs2_holder i_gh;
1752 int error;
1753
1754 error = gfs2_rs_alloc(ip);
1755 if (error)
1756 return error;
1757
1758 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1759 if (error)
1760 return error;
1761
1762 error = -EPERM;
1763 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1764 goto out;
1765
1766 error = inode_change_ok(inode, attr);
1767 if (error)
1768 goto out;
1769
1770 if (attr->ia_valid & ATTR_SIZE)
1771 error = gfs2_setattr_size(inode, attr->ia_size);
1772 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1773 error = setattr_chown(inode, attr);
1774 else {
1775 error = gfs2_setattr_simple(inode, attr);
1776 if (!error && attr->ia_valid & ATTR_MODE)
1777 error = posix_acl_chmod(inode, inode->i_mode);
1778 }
1779
1780out:
1781 if (!error)
1782 mark_inode_dirty(inode);
1783 gfs2_glock_dq_uninit(&i_gh);
1784 return error;
1785}
1786
1787/**
1788 * gfs2_getattr - Read out an inode's attributes
1789 * @mnt: The vfsmount the inode is being accessed from
1790 * @dentry: The dentry to stat
1791 * @stat: The inode's stats
1792 *
1793 * This may be called from the VFS directly, or from within GFS2 with the
1794 * inode locked, so we look to see if the glock is already locked and only
1795 * lock the glock if its not already been done. Note that its the NFS
1796 * readdirplus operation which causes this to be called (from filldir)
1797 * with the glock already held.
1798 *
1799 * Returns: errno
1800 */
1801
1802static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1803 struct kstat *stat)
1804{
1805 struct inode *inode = dentry->d_inode;
1806 struct gfs2_inode *ip = GFS2_I(inode);
1807 struct gfs2_holder gh;
1808 int error;
1809 int unlock = 0;
1810
1811 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1812 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1813 if (error)
1814 return error;
1815 unlock = 1;
1816 }
1817
1818 generic_fillattr(inode, stat);
1819 if (unlock)
1820 gfs2_glock_dq_uninit(&gh);
1821
1822 return 0;
1823}
1824
1825static int gfs2_setxattr(struct dentry *dentry, const char *name,
1826 const void *data, size_t size, int flags)
1827{
1828 struct inode *inode = dentry->d_inode;
1829 struct gfs2_inode *ip = GFS2_I(inode);
1830 struct gfs2_holder gh;
1831 int ret;
1832
1833 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1834 ret = gfs2_glock_nq(&gh);
1835 if (ret == 0) {
1836 ret = gfs2_rs_alloc(ip);
1837 if (ret == 0)
1838 ret = generic_setxattr(dentry, name, data, size, flags);
1839 gfs2_glock_dq(&gh);
1840 }
1841 gfs2_holder_uninit(&gh);
1842 return ret;
1843}
1844
1845static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1846 void *data, size_t size)
1847{
1848 struct inode *inode = dentry->d_inode;
1849 struct gfs2_inode *ip = GFS2_I(inode);
1850 struct gfs2_holder gh;
1851 int ret;
1852
1853 /* For selinux during lookup */
1854 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1855 return generic_getxattr(dentry, name, data, size);
1856
1857 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1858 ret = gfs2_glock_nq(&gh);
1859 if (ret == 0) {
1860 ret = generic_getxattr(dentry, name, data, size);
1861 gfs2_glock_dq(&gh);
1862 }
1863 gfs2_holder_uninit(&gh);
1864 return ret;
1865}
1866
1867static int gfs2_removexattr(struct dentry *dentry, const char *name)
1868{
1869 struct inode *inode = dentry->d_inode;
1870 struct gfs2_inode *ip = GFS2_I(inode);
1871 struct gfs2_holder gh;
1872 int ret;
1873
1874 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1875 ret = gfs2_glock_nq(&gh);
1876 if (ret == 0) {
1877 ret = gfs2_rs_alloc(ip);
1878 if (ret == 0)
1879 ret = generic_removexattr(dentry, name);
1880 gfs2_glock_dq(&gh);
1881 }
1882 gfs2_holder_uninit(&gh);
1883 return ret;
1884}
1885
1886static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1887 u64 start, u64 len)
1888{
1889 struct gfs2_inode *ip = GFS2_I(inode);
1890 struct gfs2_holder gh;
1891 int ret;
1892
1893 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1894 if (ret)
1895 return ret;
1896
1897 mutex_lock(&inode->i_mutex);
1898
1899 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1900 if (ret)
1901 goto out;
1902
1903 if (gfs2_is_stuffed(ip)) {
1904 u64 phys = ip->i_no_addr << inode->i_blkbits;
1905 u64 size = i_size_read(inode);
1906 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1907 FIEMAP_EXTENT_DATA_INLINE;
1908 phys += sizeof(struct gfs2_dinode);
1909 phys += start;
1910 if (start + len > size)
1911 len = size - start;
1912 if (start < size)
1913 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1914 len, flags);
1915 if (ret == 1)
1916 ret = 0;
1917 } else {
1918 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1919 gfs2_block_map);
1920 }
1921
1922 gfs2_glock_dq_uninit(&gh);
1923out:
1924 mutex_unlock(&inode->i_mutex);
1925 return ret;
1926}
1927
1928const struct inode_operations gfs2_file_iops = {
1929 .permission = gfs2_permission,
1930 .setattr = gfs2_setattr,
1931 .getattr = gfs2_getattr,
1932 .setxattr = gfs2_setxattr,
1933 .getxattr = gfs2_getxattr,
1934 .listxattr = gfs2_listxattr,
1935 .removexattr = gfs2_removexattr,
1936 .fiemap = gfs2_fiemap,
1937 .get_acl = gfs2_get_acl,
1938 .set_acl = gfs2_set_acl,
1939};
1940
1941const struct inode_operations gfs2_dir_iops = {
1942 .create = gfs2_create,
1943 .lookup = gfs2_lookup,
1944 .link = gfs2_link,
1945 .unlink = gfs2_unlink,
1946 .symlink = gfs2_symlink,
1947 .mkdir = gfs2_mkdir,
1948 .rmdir = gfs2_unlink,
1949 .mknod = gfs2_mknod,
1950 .rename = gfs2_rename,
1951 .permission = gfs2_permission,
1952 .setattr = gfs2_setattr,
1953 .getattr = gfs2_getattr,
1954 .setxattr = gfs2_setxattr,
1955 .getxattr = gfs2_getxattr,
1956 .listxattr = gfs2_listxattr,
1957 .removexattr = gfs2_removexattr,
1958 .fiemap = gfs2_fiemap,
1959 .get_acl = gfs2_get_acl,
1960 .set_acl = gfs2_set_acl,
1961 .atomic_open = gfs2_atomic_open,
1962};
1963
1964const struct inode_operations gfs2_symlink_iops = {
1965 .readlink = generic_readlink,
1966 .follow_link = gfs2_follow_link,
1967 .put_link = kfree_put_link,
1968 .permission = gfs2_permission,
1969 .setattr = gfs2_setattr,
1970 .getattr = gfs2_getattr,
1971 .setxattr = gfs2_setxattr,
1972 .getxattr = gfs2_getxattr,
1973 .listxattr = gfs2_listxattr,
1974 .removexattr = gfs2_removexattr,
1975 .fiemap = gfs2_fiemap,
1976};
1977