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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 umode_t mode)
337{
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365}
366
367static void munge_mode_uid_gid(struct gfs2_inode *dip, umode_t *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 int dblocks = 1;
393
394 error = gfs2_inplace_reserve(dip, RES_DINODE);
395 if (error)
396 goto out;
397
398 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
399 if (error)
400 goto out_ipreserv;
401
402 error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);
403
404 gfs2_trans_end(sdp);
405
406out_ipreserv:
407 gfs2_inplace_release(dip);
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 * init_dinode - Fill in a new dinode structure
431 * @dip: The directory this inode is being created in
432 * @gl: The glock covering the new inode
433 * @inum: The inode number
434 * @mode: The file permissions
435 * @uid: The uid of the new inode
436 * @gid: The gid of the new inode
437 * @generation: The generation number of the new inode
438 * @dev: The device number (if a device node)
439 * @symname: The symlink destination (if a symlink)
440 * @size: The inode size (ignored for directories)
441 * @bhp: The buffer head (returned to caller)
442 *
443 */
444
445static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
446 const struct gfs2_inum_host *inum, umode_t mode,
447 unsigned int uid, unsigned int gid,
448 const u64 *generation, dev_t dev, const char *symname,
449 unsigned size, struct buffer_head **bhp)
450{
451 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
452 struct gfs2_dinode *di;
453 struct buffer_head *dibh;
454 struct timespec tv = CURRENT_TIME;
455
456 dibh = gfs2_meta_new(gl, inum->no_addr);
457 gfs2_trans_add_bh(gl, dibh, 1);
458 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
459 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
460 di = (struct gfs2_dinode *)dibh->b_data;
461
462 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
463 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
464 di->di_mode = cpu_to_be32(mode);
465 di->di_uid = cpu_to_be32(uid);
466 di->di_gid = cpu_to_be32(gid);
467 di->di_nlink = 0;
468 di->di_size = cpu_to_be64(size);
469 di->di_blocks = cpu_to_be64(1);
470 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
471 di->di_major = cpu_to_be32(MAJOR(dev));
472 di->di_minor = cpu_to_be32(MINOR(dev));
473 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
474 di->di_generation = cpu_to_be64(*generation);
475 di->di_flags = 0;
476 di->__pad1 = 0;
477 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
478 di->di_height = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 di->di_depth = 0;
482 di->di_entries = 0;
483 memset(&di->__pad4, 0, sizeof(di->__pad4));
484 di->di_eattr = 0;
485 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
486 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
487 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
488 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
489
490 switch(mode & S_IFMT) {
491 case S_IFREG:
492 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
493 gfs2_tune_get(sdp, gt_new_files_jdata))
494 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
495 break;
496 case S_IFDIR:
497 di->di_flags |= cpu_to_be32(dip->i_diskflags &
498 GFS2_DIF_INHERIT_JDATA);
499 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
500 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
501 di->di_entries = cpu_to_be32(2);
502 gfs2_init_dir(dibh, dip);
503 break;
504 case S_IFLNK:
505 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
506 break;
507 }
508
509 set_buffer_uptodate(dibh);
510
511 *bhp = dibh;
512}
513
514static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
515 umode_t mode, const struct gfs2_inum_host *inum,
516 const u64 *generation, dev_t dev, const char *symname,
517 unsigned int size, struct buffer_head **bhp)
518{
519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520 unsigned int uid, gid;
521 int error;
522
523 munge_mode_uid_gid(dip, &mode, &uid, &gid);
524 if (!gfs2_qadata_get(dip))
525 return -ENOMEM;
526
527 error = gfs2_quota_lock(dip, uid, gid);
528 if (error)
529 goto out;
530
531 error = gfs2_quota_check(dip, uid, gid);
532 if (error)
533 goto out_quota;
534
535 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
536 if (error)
537 goto out_quota;
538
539 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
540 gfs2_quota_change(dip, +1, uid, gid);
541 gfs2_trans_end(sdp);
542
543out_quota:
544 gfs2_quota_unlock(dip);
545out:
546 gfs2_qadata_put(dip);
547 return error;
548}
549
550static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
551 struct gfs2_inode *ip)
552{
553 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
554 struct gfs2_qadata *qa;
555 int alloc_required;
556 struct buffer_head *dibh;
557 int error;
558
559 qa = gfs2_qadata_get(dip);
560 if (!qa)
561 return -ENOMEM;
562
563 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
564 if (error)
565 goto fail;
566
567 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
568 if (alloc_required < 0)
569 goto fail_quota_locks;
570 if (alloc_required) {
571 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
572 if (error)
573 goto fail_quota_locks;
574
575 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
576 if (error)
577 goto fail_quota_locks;
578
579 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
580 dip->i_rgd->rd_length +
581 2 * RES_DINODE +
582 RES_STATFS + RES_QUOTA, 0);
583 if (error)
584 goto fail_ipreserv;
585 } else {
586 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
587 if (error)
588 goto fail_quota_locks;
589 }
590
591 error = gfs2_dir_add(&dip->i_inode, name, ip);
592 if (error)
593 goto fail_end_trans;
594
595 error = gfs2_meta_inode_buffer(ip, &dibh);
596 if (error)
597 goto fail_end_trans;
598 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1);
599 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
600 gfs2_dinode_out(ip, dibh->b_data);
601 brelse(dibh);
602 return 0;
603
604fail_end_trans:
605 gfs2_trans_end(sdp);
606
607fail_ipreserv:
608 gfs2_inplace_release(dip);
609
610fail_quota_locks:
611 gfs2_quota_unlock(dip);
612
613fail:
614 gfs2_qadata_put(dip);
615 return error;
616}
617
618static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
619 void *fs_info)
620{
621 const struct xattr *xattr;
622 int err = 0;
623
624 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
625 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
626 xattr->value_len, 0,
627 GFS2_EATYPE_SECURITY);
628 if (err < 0)
629 break;
630 }
631 return err;
632}
633
634static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
635 const struct qstr *qstr)
636{
637 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
638 &gfs2_initxattrs, NULL);
639}
640
641/**
642 * gfs2_create_inode - Create a new inode
643 * @dir: The parent directory
644 * @dentry: The new dentry
645 * @mode: The permissions on the new inode
646 * @dev: For device nodes, this is the device number
647 * @symname: For symlinks, this is the link destination
648 * @size: The initial size of the inode (ignored for directories)
649 *
650 * Returns: 0 on success, or error code
651 */
652
653static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
654 umode_t mode, dev_t dev, const char *symname,
655 unsigned int size, int excl)
656{
657 const struct qstr *name = &dentry->d_name;
658 struct gfs2_holder ghs[2];
659 struct inode *inode = NULL;
660 struct gfs2_inode *dip = GFS2_I(dir);
661 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
662 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
663 int error;
664 u64 generation;
665 struct buffer_head *bh = NULL;
666
667 if (!name->len || name->len > GFS2_FNAMESIZE)
668 return -ENAMETOOLONG;
669
670 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
671 if (error)
672 goto fail;
673
674 error = create_ok(dip, name, mode);
675 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
676 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
677 gfs2_glock_dq_uninit(ghs);
678 d_instantiate(dentry, inode);
679 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
680 }
681 if (error)
682 goto fail_gunlock;
683
684 error = alloc_dinode(dip, &inum.no_addr, &generation);
685 if (error)
686 goto fail_gunlock;
687 inum.no_formal_ino = generation;
688
689 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
690 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
691 if (error)
692 goto fail_gunlock;
693
694 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
695 if (error)
696 goto fail_gunlock2;
697
698 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
699 inum.no_formal_ino, 0);
700 if (IS_ERR(inode))
701 goto fail_gunlock2;
702
703 error = gfs2_inode_refresh(GFS2_I(inode));
704 if (error)
705 goto fail_gunlock2;
706
707 error = gfs2_acl_create(dip, inode);
708 if (error)
709 goto fail_gunlock2;
710
711 error = gfs2_security_init(dip, GFS2_I(inode), name);
712 if (error)
713 goto fail_gunlock2;
714
715 error = link_dinode(dip, name, GFS2_I(inode));
716 if (error)
717 goto fail_gunlock2;
718
719 if (bh)
720 brelse(bh);
721
722 gfs2_trans_end(sdp);
723 /* Check if we reserved space in the rgrp. Function link_dinode may
724 not, depending on whether alloc is required. */
725 if (dip->i_res)
726 gfs2_inplace_release(dip);
727 gfs2_quota_unlock(dip);
728 gfs2_qadata_put(dip);
729 mark_inode_dirty(inode);
730 gfs2_glock_dq_uninit_m(2, ghs);
731 d_instantiate(dentry, inode);
732 return 0;
733
734fail_gunlock2:
735 gfs2_glock_dq_uninit(ghs + 1);
736fail_gunlock:
737 gfs2_glock_dq_uninit(ghs);
738 if (inode && !IS_ERR(inode)) {
739 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
740 iput(inode);
741 }
742fail:
743 if (bh)
744 brelse(bh);
745 return error;
746}
747
748/**
749 * gfs2_create - Create a file
750 * @dir: The directory in which to create the file
751 * @dentry: The dentry of the new file
752 * @mode: The mode of the new file
753 *
754 * Returns: errno
755 */
756
757static int gfs2_create(struct inode *dir, struct dentry *dentry,
758 umode_t mode, struct nameidata *nd)
759{
760 int excl = 0;
761 if (nd && (nd->flags & LOOKUP_EXCL))
762 excl = 1;
763 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
764}
765
766/**
767 * gfs2_lookup - Look up a filename in a directory and return its inode
768 * @dir: The directory inode
769 * @dentry: The dentry of the new inode
770 * @nd: passed from Linux VFS, ignored by us
771 *
772 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
773 *
774 * Returns: errno
775 */
776
777static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
778 struct nameidata *nd)
779{
780 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
781 if (inode && !IS_ERR(inode)) {
782 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
783 struct gfs2_holder gh;
784 int error;
785 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
786 if (error) {
787 iput(inode);
788 return ERR_PTR(error);
789 }
790 gfs2_glock_dq_uninit(&gh);
791 }
792 return d_splice_alias(inode, dentry);
793}
794
795/**
796 * gfs2_link - Link to a file
797 * @old_dentry: The inode to link
798 * @dir: Add link to this directory
799 * @dentry: The name of the link
800 *
801 * Link the inode in "old_dentry" into the directory "dir" with the
802 * name in "dentry".
803 *
804 * Returns: errno
805 */
806
807static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
808 struct dentry *dentry)
809{
810 struct gfs2_inode *dip = GFS2_I(dir);
811 struct gfs2_sbd *sdp = GFS2_SB(dir);
812 struct inode *inode = old_dentry->d_inode;
813 struct gfs2_inode *ip = GFS2_I(inode);
814 struct gfs2_holder ghs[2];
815 struct buffer_head *dibh;
816 int alloc_required;
817 int error;
818
819 if (S_ISDIR(inode->i_mode))
820 return -EPERM;
821
822 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
823 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
824
825 error = gfs2_glock_nq(ghs); /* parent */
826 if (error)
827 goto out_parent;
828
829 error = gfs2_glock_nq(ghs + 1); /* child */
830 if (error)
831 goto out_child;
832
833 error = -ENOENT;
834 if (inode->i_nlink == 0)
835 goto out_gunlock;
836
837 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
838 if (error)
839 goto out_gunlock;
840
841 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
842 switch (error) {
843 case -ENOENT:
844 break;
845 case 0:
846 error = -EEXIST;
847 default:
848 goto out_gunlock;
849 }
850
851 error = -EINVAL;
852 if (!dip->i_inode.i_nlink)
853 goto out_gunlock;
854 error = -EFBIG;
855 if (dip->i_entries == (u32)-1)
856 goto out_gunlock;
857 error = -EPERM;
858 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
859 goto out_gunlock;
860 error = -EINVAL;
861 if (!ip->i_inode.i_nlink)
862 goto out_gunlock;
863 error = -EMLINK;
864 if (ip->i_inode.i_nlink == (u32)-1)
865 goto out_gunlock;
866
867 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
868 if (error < 0)
869 goto out_gunlock;
870 error = 0;
871
872 if (alloc_required) {
873 struct gfs2_qadata *qa = gfs2_qadata_get(dip);
874
875 if (!qa) {
876 error = -ENOMEM;
877 goto out_gunlock;
878 }
879
880 error = gfs2_quota_lock_check(dip);
881 if (error)
882 goto out_alloc;
883
884 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
885 if (error)
886 goto out_gunlock_q;
887
888 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
889 gfs2_rg_blocks(dip) +
890 2 * RES_DINODE + RES_STATFS +
891 RES_QUOTA, 0);
892 if (error)
893 goto out_ipres;
894 } else {
895 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
896 if (error)
897 goto out_ipres;
898 }
899
900 error = gfs2_meta_inode_buffer(ip, &dibh);
901 if (error)
902 goto out_end_trans;
903
904 error = gfs2_dir_add(dir, &dentry->d_name, ip);
905 if (error)
906 goto out_brelse;
907
908 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
909 inc_nlink(&ip->i_inode);
910 ip->i_inode.i_ctime = CURRENT_TIME;
911 ihold(inode);
912 d_instantiate(dentry, inode);
913 mark_inode_dirty(inode);
914
915out_brelse:
916 brelse(dibh);
917out_end_trans:
918 gfs2_trans_end(sdp);
919out_ipres:
920 if (alloc_required)
921 gfs2_inplace_release(dip);
922out_gunlock_q:
923 if (alloc_required)
924 gfs2_quota_unlock(dip);
925out_alloc:
926 if (alloc_required)
927 gfs2_qadata_put(dip);
928out_gunlock:
929 gfs2_glock_dq(ghs + 1);
930out_child:
931 gfs2_glock_dq(ghs);
932out_parent:
933 gfs2_holder_uninit(ghs);
934 gfs2_holder_uninit(ghs + 1);
935 return error;
936}
937
938/*
939 * gfs2_unlink_ok - check to see that a inode is still in a directory
940 * @dip: the directory
941 * @name: the name of the file
942 * @ip: the inode
943 *
944 * Assumes that the lock on (at least) @dip is held.
945 *
946 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
947 */
948
949static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
950 const struct gfs2_inode *ip)
951{
952 int error;
953
954 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
955 return -EPERM;
956
957 if ((dip->i_inode.i_mode & S_ISVTX) &&
958 dip->i_inode.i_uid != current_fsuid() &&
959 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
960 return -EPERM;
961
962 if (IS_APPEND(&dip->i_inode))
963 return -EPERM;
964
965 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
966 if (error)
967 return error;
968
969 error = gfs2_dir_check(&dip->i_inode, name, ip);
970 if (error)
971 return error;
972
973 return 0;
974}
975
976/**
977 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
978 * @dip: The parent directory
979 * @name: The name of the entry in the parent directory
980 * @bh: The inode buffer for the inode to be removed
981 * @inode: The inode to be removed
982 *
983 * Called with all the locks and in a transaction. This will only be
984 * called for a directory after it has been checked to ensure it is empty.
985 *
986 * Returns: 0 on success, or an error
987 */
988
989static int gfs2_unlink_inode(struct gfs2_inode *dip,
990 const struct dentry *dentry,
991 struct buffer_head *bh)
992{
993 struct inode *inode = dentry->d_inode;
994 struct gfs2_inode *ip = GFS2_I(inode);
995 int error;
996
997 error = gfs2_dir_del(dip, dentry);
998 if (error)
999 return error;
1000
1001 ip->i_entries = 0;
1002 inode->i_ctime = CURRENT_TIME;
1003 if (S_ISDIR(inode->i_mode))
1004 clear_nlink(inode);
1005 else
1006 drop_nlink(inode);
1007 mark_inode_dirty(inode);
1008 if (inode->i_nlink == 0)
1009 gfs2_unlink_di(inode);
1010 return 0;
1011}
1012
1013
1014/**
1015 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1016 * @dir: The inode of the directory containing the inode to unlink
1017 * @dentry: The file itself
1018 *
1019 * This routine uses the type of the inode as a flag to figure out
1020 * whether this is an unlink or an rmdir.
1021 *
1022 * Returns: errno
1023 */
1024
1025static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1026{
1027 struct gfs2_inode *dip = GFS2_I(dir);
1028 struct gfs2_sbd *sdp = GFS2_SB(dir);
1029 struct inode *inode = dentry->d_inode;
1030 struct gfs2_inode *ip = GFS2_I(inode);
1031 struct buffer_head *bh;
1032 struct gfs2_holder ghs[3];
1033 struct gfs2_rgrpd *rgd;
1034 int error;
1035
1036 error = gfs2_rindex_update(sdp);
1037 if (error)
1038 return error;
1039
1040 error = -EROFS;
1041
1042 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1044
1045 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1046 if (!rgd)
1047 goto out_inodes;
1048
1049 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1050
1051
1052 error = gfs2_glock_nq(ghs); /* parent */
1053 if (error)
1054 goto out_parent;
1055
1056 error = gfs2_glock_nq(ghs + 1); /* child */
1057 if (error)
1058 goto out_child;
1059
1060 error = -ENOENT;
1061 if (inode->i_nlink == 0)
1062 goto out_rgrp;
1063
1064 if (S_ISDIR(inode->i_mode)) {
1065 error = -ENOTEMPTY;
1066 if (ip->i_entries > 2 || inode->i_nlink > 2)
1067 goto out_rgrp;
1068 }
1069
1070 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1071 if (error)
1072 goto out_rgrp;
1073
1074 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1075 if (error)
1076 goto out_gunlock;
1077
1078 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1079 if (error)
1080 goto out_gunlock;
1081
1082 error = gfs2_meta_inode_buffer(ip, &bh);
1083 if (error)
1084 goto out_end_trans;
1085
1086 error = gfs2_unlink_inode(dip, dentry, bh);
1087 brelse(bh);
1088
1089out_end_trans:
1090 gfs2_trans_end(sdp);
1091out_gunlock:
1092 gfs2_glock_dq(ghs + 2);
1093out_rgrp:
1094 gfs2_glock_dq(ghs + 1);
1095out_child:
1096 gfs2_glock_dq(ghs);
1097out_parent:
1098 gfs2_holder_uninit(ghs + 2);
1099out_inodes:
1100 gfs2_holder_uninit(ghs + 1);
1101 gfs2_holder_uninit(ghs);
1102 return error;
1103}
1104
1105/**
1106 * gfs2_symlink - Create a symlink
1107 * @dir: The directory to create the symlink in
1108 * @dentry: The dentry to put the symlink in
1109 * @symname: The thing which the link points to
1110 *
1111 * Returns: errno
1112 */
1113
1114static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1115 const char *symname)
1116{
1117 struct gfs2_sbd *sdp = GFS2_SB(dir);
1118 unsigned int size;
1119
1120 size = strlen(symname);
1121 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1122 return -ENAMETOOLONG;
1123
1124 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1125}
1126
1127/**
1128 * gfs2_mkdir - Make a directory
1129 * @dir: The parent directory of the new one
1130 * @dentry: The dentry of the new directory
1131 * @mode: The mode of the new directory
1132 *
1133 * Returns: errno
1134 */
1135
1136static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1137{
1138 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1139}
1140
1141/**
1142 * gfs2_mknod - Make a special file
1143 * @dir: The directory in which the special file will reside
1144 * @dentry: The dentry of the special file
1145 * @mode: The mode of the special file
1146 * @dev: The device specification of the special file
1147 *
1148 */
1149
1150static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1151 dev_t dev)
1152{
1153 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1154}
1155
1156/*
1157 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1158 * @this: move this
1159 * @to: to here
1160 *
1161 * Follow @to back to the root and make sure we don't encounter @this
1162 * Assumes we already hold the rename lock.
1163 *
1164 * Returns: errno
1165 */
1166
1167static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1168{
1169 struct inode *dir = &to->i_inode;
1170 struct super_block *sb = dir->i_sb;
1171 struct inode *tmp;
1172 int error = 0;
1173
1174 igrab(dir);
1175
1176 for (;;) {
1177 if (dir == &this->i_inode) {
1178 error = -EINVAL;
1179 break;
1180 }
1181 if (dir == sb->s_root->d_inode) {
1182 error = 0;
1183 break;
1184 }
1185
1186 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1187 if (IS_ERR(tmp)) {
1188 error = PTR_ERR(tmp);
1189 break;
1190 }
1191
1192 iput(dir);
1193 dir = tmp;
1194 }
1195
1196 iput(dir);
1197
1198 return error;
1199}
1200
1201/**
1202 * gfs2_rename - Rename a file
1203 * @odir: Parent directory of old file name
1204 * @odentry: The old dentry of the file
1205 * @ndir: Parent directory of new file name
1206 * @ndentry: The new dentry of the file
1207 *
1208 * Returns: errno
1209 */
1210
1211static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1212 struct inode *ndir, struct dentry *ndentry)
1213{
1214 struct gfs2_inode *odip = GFS2_I(odir);
1215 struct gfs2_inode *ndip = GFS2_I(ndir);
1216 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1217 struct gfs2_inode *nip = NULL;
1218 struct gfs2_sbd *sdp = GFS2_SB(odir);
1219 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1220 struct gfs2_rgrpd *nrgd;
1221 unsigned int num_gh;
1222 int dir_rename = 0;
1223 int alloc_required = 0;
1224 unsigned int x;
1225 int error;
1226
1227 if (ndentry->d_inode) {
1228 nip = GFS2_I(ndentry->d_inode);
1229 if (ip == nip)
1230 return 0;
1231 }
1232
1233 error = gfs2_rindex_update(sdp);
1234 if (error)
1235 return error;
1236
1237 if (odip != ndip) {
1238 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1239 0, &r_gh);
1240 if (error)
1241 goto out;
1242
1243 if (S_ISDIR(ip->i_inode.i_mode)) {
1244 dir_rename = 1;
1245 /* don't move a dirctory into it's subdir */
1246 error = gfs2_ok_to_move(ip, ndip);
1247 if (error)
1248 goto out_gunlock_r;
1249 }
1250 }
1251
1252 num_gh = 1;
1253 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1254 if (odip != ndip) {
1255 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1256 num_gh++;
1257 }
1258 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1259 num_gh++;
1260
1261 if (nip) {
1262 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1263 num_gh++;
1264 /* grab the resource lock for unlink flag twiddling
1265 * this is the case of the target file already existing
1266 * so we unlink before doing the rename
1267 */
1268 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1269 if (nrgd)
1270 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1271 }
1272
1273 for (x = 0; x < num_gh; x++) {
1274 error = gfs2_glock_nq(ghs + x);
1275 if (error)
1276 goto out_gunlock;
1277 }
1278
1279 error = -ENOENT;
1280 if (ip->i_inode.i_nlink == 0)
1281 goto out_gunlock;
1282
1283 /* Check out the old directory */
1284
1285 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1286 if (error)
1287 goto out_gunlock;
1288
1289 /* Check out the new directory */
1290
1291 if (nip) {
1292 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1293 if (error)
1294 goto out_gunlock;
1295
1296 if (nip->i_inode.i_nlink == 0) {
1297 error = -EAGAIN;
1298 goto out_gunlock;
1299 }
1300
1301 if (S_ISDIR(nip->i_inode.i_mode)) {
1302 if (nip->i_entries < 2) {
1303 gfs2_consist_inode(nip);
1304 error = -EIO;
1305 goto out_gunlock;
1306 }
1307 if (nip->i_entries > 2) {
1308 error = -ENOTEMPTY;
1309 goto out_gunlock;
1310 }
1311 }
1312 } else {
1313 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1314 if (error)
1315 goto out_gunlock;
1316
1317 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1318 switch (error) {
1319 case -ENOENT:
1320 error = 0;
1321 break;
1322 case 0:
1323 error = -EEXIST;
1324 default:
1325 goto out_gunlock;
1326 };
1327
1328 if (odip != ndip) {
1329 if (!ndip->i_inode.i_nlink) {
1330 error = -ENOENT;
1331 goto out_gunlock;
1332 }
1333 if (ndip->i_entries == (u32)-1) {
1334 error = -EFBIG;
1335 goto out_gunlock;
1336 }
1337 if (S_ISDIR(ip->i_inode.i_mode) &&
1338 ndip->i_inode.i_nlink == (u32)-1) {
1339 error = -EMLINK;
1340 goto out_gunlock;
1341 }
1342 }
1343 }
1344
1345 /* Check out the dir to be renamed */
1346
1347 if (dir_rename) {
1348 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1349 if (error)
1350 goto out_gunlock;
1351 }
1352
1353 if (nip == NULL)
1354 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1355 error = alloc_required;
1356 if (error < 0)
1357 goto out_gunlock;
1358
1359 if (alloc_required) {
1360 struct gfs2_qadata *qa = gfs2_qadata_get(ndip);
1361
1362 if (!qa) {
1363 error = -ENOMEM;
1364 goto out_gunlock;
1365 }
1366
1367 error = gfs2_quota_lock_check(ndip);
1368 if (error)
1369 goto out_alloc;
1370
1371 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
1372 if (error)
1373 goto out_gunlock_q;
1374
1375 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1376 gfs2_rg_blocks(ndip) +
1377 4 * RES_DINODE + 4 * RES_LEAF +
1378 RES_STATFS + RES_QUOTA + 4, 0);
1379 if (error)
1380 goto out_ipreserv;
1381 } else {
1382 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1383 5 * RES_LEAF + 4, 0);
1384 if (error)
1385 goto out_gunlock;
1386 }
1387
1388 /* Remove the target file, if it exists */
1389
1390 if (nip) {
1391 struct buffer_head *bh;
1392 error = gfs2_meta_inode_buffer(nip, &bh);
1393 if (error)
1394 goto out_end_trans;
1395 error = gfs2_unlink_inode(ndip, ndentry, bh);
1396 brelse(bh);
1397 }
1398
1399 if (dir_rename) {
1400 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1401 if (error)
1402 goto out_end_trans;
1403 } else {
1404 struct buffer_head *dibh;
1405 error = gfs2_meta_inode_buffer(ip, &dibh);
1406 if (error)
1407 goto out_end_trans;
1408 ip->i_inode.i_ctime = CURRENT_TIME;
1409 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1410 gfs2_dinode_out(ip, dibh->b_data);
1411 brelse(dibh);
1412 }
1413
1414 error = gfs2_dir_del(odip, odentry);
1415 if (error)
1416 goto out_end_trans;
1417
1418 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1419 if (error)
1420 goto out_end_trans;
1421
1422out_end_trans:
1423 gfs2_trans_end(sdp);
1424out_ipreserv:
1425 if (alloc_required)
1426 gfs2_inplace_release(ndip);
1427out_gunlock_q:
1428 if (alloc_required)
1429 gfs2_quota_unlock(ndip);
1430out_alloc:
1431 if (alloc_required)
1432 gfs2_qadata_put(ndip);
1433out_gunlock:
1434 while (x--) {
1435 gfs2_glock_dq(ghs + x);
1436 gfs2_holder_uninit(ghs + x);
1437 }
1438out_gunlock_r:
1439 if (r_gh.gh_gl)
1440 gfs2_glock_dq_uninit(&r_gh);
1441out:
1442 return error;
1443}
1444
1445/**
1446 * gfs2_follow_link - Follow a symbolic link
1447 * @dentry: The dentry of the link
1448 * @nd: Data that we pass to vfs_follow_link()
1449 *
1450 * This can handle symlinks of any size.
1451 *
1452 * Returns: 0 on success or error code
1453 */
1454
1455static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1456{
1457 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1458 struct gfs2_holder i_gh;
1459 struct buffer_head *dibh;
1460 unsigned int size;
1461 char *buf;
1462 int error;
1463
1464 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1465 error = gfs2_glock_nq(&i_gh);
1466 if (error) {
1467 gfs2_holder_uninit(&i_gh);
1468 nd_set_link(nd, ERR_PTR(error));
1469 return NULL;
1470 }
1471
1472 size = (unsigned int)i_size_read(&ip->i_inode);
1473 if (size == 0) {
1474 gfs2_consist_inode(ip);
1475 buf = ERR_PTR(-EIO);
1476 goto out;
1477 }
1478
1479 error = gfs2_meta_inode_buffer(ip, &dibh);
1480 if (error) {
1481 buf = ERR_PTR(error);
1482 goto out;
1483 }
1484
1485 buf = kzalloc(size + 1, GFP_NOFS);
1486 if (!buf)
1487 buf = ERR_PTR(-ENOMEM);
1488 else
1489 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1490 brelse(dibh);
1491out:
1492 gfs2_glock_dq_uninit(&i_gh);
1493 nd_set_link(nd, buf);
1494 return NULL;
1495}
1496
1497static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1498{
1499 char *s = nd_get_link(nd);
1500 if (!IS_ERR(s))
1501 kfree(s);
1502}
1503
1504/**
1505 * gfs2_permission -
1506 * @inode: The inode
1507 * @mask: The mask to be tested
1508 * @flags: Indicates whether this is an RCU path walk or not
1509 *
1510 * This may be called from the VFS directly, or from within GFS2 with the
1511 * inode locked, so we look to see if the glock is already locked and only
1512 * lock the glock if its not already been done.
1513 *
1514 * Returns: errno
1515 */
1516
1517int gfs2_permission(struct inode *inode, int mask)
1518{
1519 struct gfs2_inode *ip;
1520 struct gfs2_holder i_gh;
1521 int error;
1522 int unlock = 0;
1523
1524
1525 ip = GFS2_I(inode);
1526 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1527 if (mask & MAY_NOT_BLOCK)
1528 return -ECHILD;
1529 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1530 if (error)
1531 return error;
1532 unlock = 1;
1533 }
1534
1535 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1536 error = -EACCES;
1537 else
1538 error = generic_permission(inode, mask);
1539 if (unlock)
1540 gfs2_glock_dq_uninit(&i_gh);
1541
1542 return error;
1543}
1544
1545static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1546{
1547 setattr_copy(inode, attr);
1548 mark_inode_dirty(inode);
1549 return 0;
1550}
1551
1552/**
1553 * gfs2_setattr_simple -
1554 * @ip:
1555 * @attr:
1556 *
1557 * Returns: errno
1558 */
1559
1560int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1561{
1562 int error;
1563
1564 if (current->journal_info)
1565 return __gfs2_setattr_simple(inode, attr);
1566
1567 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1568 if (error)
1569 return error;
1570
1571 error = __gfs2_setattr_simple(inode, attr);
1572 gfs2_trans_end(GFS2_SB(inode));
1573 return error;
1574}
1575
1576static int setattr_chown(struct inode *inode, struct iattr *attr)
1577{
1578 struct gfs2_inode *ip = GFS2_I(inode);
1579 struct gfs2_sbd *sdp = GFS2_SB(inode);
1580 u32 ouid, ogid, nuid, ngid;
1581 int error;
1582
1583 ouid = inode->i_uid;
1584 ogid = inode->i_gid;
1585 nuid = attr->ia_uid;
1586 ngid = attr->ia_gid;
1587
1588 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1589 ouid = nuid = NO_QUOTA_CHANGE;
1590 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1591 ogid = ngid = NO_QUOTA_CHANGE;
1592
1593 if (!gfs2_qadata_get(ip))
1594 return -ENOMEM;
1595
1596 error = gfs2_quota_lock(ip, nuid, ngid);
1597 if (error)
1598 goto out_alloc;
1599
1600 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1601 error = gfs2_quota_check(ip, nuid, ngid);
1602 if (error)
1603 goto out_gunlock_q;
1604 }
1605
1606 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1607 if (error)
1608 goto out_gunlock_q;
1609
1610 error = gfs2_setattr_simple(inode, attr);
1611 if (error)
1612 goto out_end_trans;
1613
1614 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1615 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1616 gfs2_quota_change(ip, -blocks, ouid, ogid);
1617 gfs2_quota_change(ip, blocks, nuid, ngid);
1618 }
1619
1620out_end_trans:
1621 gfs2_trans_end(sdp);
1622out_gunlock_q:
1623 gfs2_quota_unlock(ip);
1624out_alloc:
1625 gfs2_qadata_put(ip);
1626 return error;
1627}
1628
1629/**
1630 * gfs2_setattr - Change attributes on an inode
1631 * @dentry: The dentry which is changing
1632 * @attr: The structure describing the change
1633 *
1634 * The VFS layer wants to change one or more of an inodes attributes. Write
1635 * that change out to disk.
1636 *
1637 * Returns: errno
1638 */
1639
1640static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1641{
1642 struct inode *inode = dentry->d_inode;
1643 struct gfs2_inode *ip = GFS2_I(inode);
1644 struct gfs2_holder i_gh;
1645 int error;
1646
1647 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1648 if (error)
1649 return error;
1650
1651 error = -EPERM;
1652 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1653 goto out;
1654
1655 error = inode_change_ok(inode, attr);
1656 if (error)
1657 goto out;
1658
1659 if (attr->ia_valid & ATTR_SIZE)
1660 error = gfs2_setattr_size(inode, attr->ia_size);
1661 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1662 error = setattr_chown(inode, attr);
1663 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1664 error = gfs2_acl_chmod(ip, attr);
1665 else
1666 error = gfs2_setattr_simple(inode, attr);
1667
1668out:
1669 if (!error)
1670 mark_inode_dirty(inode);
1671 gfs2_glock_dq_uninit(&i_gh);
1672 return error;
1673}
1674
1675/**
1676 * gfs2_getattr - Read out an inode's attributes
1677 * @mnt: The vfsmount the inode is being accessed from
1678 * @dentry: The dentry to stat
1679 * @stat: The inode's stats
1680 *
1681 * This may be called from the VFS directly, or from within GFS2 with the
1682 * inode locked, so we look to see if the glock is already locked and only
1683 * lock the glock if its not already been done. Note that its the NFS
1684 * readdirplus operation which causes this to be called (from filldir)
1685 * with the glock already held.
1686 *
1687 * Returns: errno
1688 */
1689
1690static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1691 struct kstat *stat)
1692{
1693 struct inode *inode = dentry->d_inode;
1694 struct gfs2_inode *ip = GFS2_I(inode);
1695 struct gfs2_holder gh;
1696 int error;
1697 int unlock = 0;
1698
1699 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1700 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1701 if (error)
1702 return error;
1703 unlock = 1;
1704 }
1705
1706 generic_fillattr(inode, stat);
1707 if (unlock)
1708 gfs2_glock_dq_uninit(&gh);
1709
1710 return 0;
1711}
1712
1713static int gfs2_setxattr(struct dentry *dentry, const char *name,
1714 const void *data, size_t size, int flags)
1715{
1716 struct inode *inode = dentry->d_inode;
1717 struct gfs2_inode *ip = GFS2_I(inode);
1718 struct gfs2_holder gh;
1719 int ret;
1720
1721 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1722 ret = gfs2_glock_nq(&gh);
1723 if (ret == 0) {
1724 ret = generic_setxattr(dentry, name, data, size, flags);
1725 gfs2_glock_dq(&gh);
1726 }
1727 gfs2_holder_uninit(&gh);
1728 return ret;
1729}
1730
1731static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1732 void *data, size_t size)
1733{
1734 struct inode *inode = dentry->d_inode;
1735 struct gfs2_inode *ip = GFS2_I(inode);
1736 struct gfs2_holder gh;
1737 int ret;
1738
1739 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1740 ret = gfs2_glock_nq(&gh);
1741 if (ret == 0) {
1742 ret = generic_getxattr(dentry, name, data, size);
1743 gfs2_glock_dq(&gh);
1744 }
1745 gfs2_holder_uninit(&gh);
1746 return ret;
1747}
1748
1749static int gfs2_removexattr(struct dentry *dentry, const char *name)
1750{
1751 struct inode *inode = dentry->d_inode;
1752 struct gfs2_inode *ip = GFS2_I(inode);
1753 struct gfs2_holder gh;
1754 int ret;
1755
1756 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1757 ret = gfs2_glock_nq(&gh);
1758 if (ret == 0) {
1759 ret = generic_removexattr(dentry, name);
1760 gfs2_glock_dq(&gh);
1761 }
1762 gfs2_holder_uninit(&gh);
1763 return ret;
1764}
1765
1766static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1767 u64 start, u64 len)
1768{
1769 struct gfs2_inode *ip = GFS2_I(inode);
1770 struct gfs2_holder gh;
1771 int ret;
1772
1773 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1774 if (ret)
1775 return ret;
1776
1777 mutex_lock(&inode->i_mutex);
1778
1779 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1780 if (ret)
1781 goto out;
1782
1783 if (gfs2_is_stuffed(ip)) {
1784 u64 phys = ip->i_no_addr << inode->i_blkbits;
1785 u64 size = i_size_read(inode);
1786 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1787 FIEMAP_EXTENT_DATA_INLINE;
1788 phys += sizeof(struct gfs2_dinode);
1789 phys += start;
1790 if (start + len > size)
1791 len = size - start;
1792 if (start < size)
1793 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1794 len, flags);
1795 if (ret == 1)
1796 ret = 0;
1797 } else {
1798 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1799 gfs2_block_map);
1800 }
1801
1802 gfs2_glock_dq_uninit(&gh);
1803out:
1804 mutex_unlock(&inode->i_mutex);
1805 return ret;
1806}
1807
1808const struct inode_operations gfs2_file_iops = {
1809 .permission = gfs2_permission,
1810 .setattr = gfs2_setattr,
1811 .getattr = gfs2_getattr,
1812 .setxattr = gfs2_setxattr,
1813 .getxattr = gfs2_getxattr,
1814 .listxattr = gfs2_listxattr,
1815 .removexattr = gfs2_removexattr,
1816 .fiemap = gfs2_fiemap,
1817 .get_acl = gfs2_get_acl,
1818};
1819
1820const struct inode_operations gfs2_dir_iops = {
1821 .create = gfs2_create,
1822 .lookup = gfs2_lookup,
1823 .link = gfs2_link,
1824 .unlink = gfs2_unlink,
1825 .symlink = gfs2_symlink,
1826 .mkdir = gfs2_mkdir,
1827 .rmdir = gfs2_unlink,
1828 .mknod = gfs2_mknod,
1829 .rename = gfs2_rename,
1830 .permission = gfs2_permission,
1831 .setattr = gfs2_setattr,
1832 .getattr = gfs2_getattr,
1833 .setxattr = gfs2_setxattr,
1834 .getxattr = gfs2_getxattr,
1835 .listxattr = gfs2_listxattr,
1836 .removexattr = gfs2_removexattr,
1837 .fiemap = gfs2_fiemap,
1838 .get_acl = gfs2_get_acl,
1839};
1840
1841const struct inode_operations gfs2_symlink_iops = {
1842 .readlink = generic_readlink,
1843 .follow_link = gfs2_follow_link,
1844 .put_link = gfs2_put_link,
1845 .permission = gfs2_permission,
1846 .setattr = gfs2_setattr,
1847 .getattr = gfs2_getattr,
1848 .setxattr = gfs2_setxattr,
1849 .getxattr = gfs2_getxattr,
1850 .listxattr = gfs2_listxattr,
1851 .removexattr = gfs2_removexattr,
1852 .fiemap = gfs2_fiemap,
1853 .get_acl = gfs2_get_acl,
1854};
1855
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/namei.h>
12#include <linux/mm.h>
13#include <linux/cred.h>
14#include <linux/xattr.h>
15#include <linux/posix_acl.h>
16#include <linux/gfs2_ondisk.h>
17#include <linux/crc32.h>
18#include <linux/iomap.h>
19#include <linux/security.h>
20#include <linux/uaccess.h>
21
22#include "gfs2.h"
23#include "incore.h"
24#include "acl.h"
25#include "bmap.h"
26#include "dir.h"
27#include "xattr.h"
28#include "glock.h"
29#include "inode.h"
30#include "meta_io.h"
31#include "quota.h"
32#include "rgrp.h"
33#include "trans.h"
34#include "util.h"
35#include "super.h"
36#include "glops.h"
37
38static int iget_test(struct inode *inode, void *opaque)
39{
40 u64 no_addr = *(u64 *)opaque;
41
42 return GFS2_I(inode)->i_no_addr == no_addr;
43}
44
45static int iget_set(struct inode *inode, void *opaque)
46{
47 u64 no_addr = *(u64 *)opaque;
48
49 GFS2_I(inode)->i_no_addr = no_addr;
50 inode->i_ino = no_addr;
51 return 0;
52}
53
54static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
55{
56 struct inode *inode;
57
58repeat:
59 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
60 if (!inode)
61 return inode;
62 if (is_bad_inode(inode)) {
63 iput(inode);
64 goto repeat;
65 }
66 return inode;
67}
68
69/**
70 * gfs2_set_iop - Sets inode operations
71 * @inode: The inode with correct i_mode filled in
72 *
73 * GFS2 lookup code fills in vfs inode contents based on info obtained
74 * from directory entry inside gfs2_inode_lookup().
75 */
76
77static void gfs2_set_iop(struct inode *inode)
78{
79 struct gfs2_sbd *sdp = GFS2_SB(inode);
80 umode_t mode = inode->i_mode;
81
82 if (S_ISREG(mode)) {
83 inode->i_op = &gfs2_file_iops;
84 if (gfs2_localflocks(sdp))
85 inode->i_fop = &gfs2_file_fops_nolock;
86 else
87 inode->i_fop = &gfs2_file_fops;
88 } else if (S_ISDIR(mode)) {
89 inode->i_op = &gfs2_dir_iops;
90 if (gfs2_localflocks(sdp))
91 inode->i_fop = &gfs2_dir_fops_nolock;
92 else
93 inode->i_fop = &gfs2_dir_fops;
94 } else if (S_ISLNK(mode)) {
95 inode->i_op = &gfs2_symlink_iops;
96 } else {
97 inode->i_op = &gfs2_file_iops;
98 init_special_inode(inode, inode->i_mode, inode->i_rdev);
99 }
100}
101
102/**
103 * gfs2_inode_lookup - Lookup an inode
104 * @sb: The super block
105 * @type: The type of the inode
106 * @no_addr: The inode number
107 * @no_formal_ino: The inode generation number
108 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
109 * GFS2_BLKST_FREE to indicate not to verify)
110 *
111 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
112 *
113 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
114 * placeholder because it doesn't otherwise make sense), the on-disk block type
115 * is verified to be @blktype.
116 *
117 * Returns: A VFS inode, or an error
118 */
119
120struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
121 u64 no_addr, u64 no_formal_ino,
122 unsigned int blktype)
123{
124 struct inode *inode;
125 struct gfs2_inode *ip;
126 struct gfs2_glock *io_gl = NULL;
127 struct gfs2_holder i_gh;
128 int error;
129
130 gfs2_holder_mark_uninitialized(&i_gh);
131 inode = gfs2_iget(sb, no_addr);
132 if (!inode)
133 return ERR_PTR(-ENOMEM);
134
135 ip = GFS2_I(inode);
136
137 if (inode->i_state & I_NEW) {
138 struct gfs2_sbd *sdp = GFS2_SB(inode);
139 ip->i_no_formal_ino = no_formal_ino;
140
141 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
142 if (unlikely(error))
143 goto fail;
144 flush_delayed_work(&ip->i_gl->gl_work);
145
146 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
147 if (unlikely(error))
148 goto fail_put;
149
150 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
151 /*
152 * The GL_SKIP flag indicates to skip reading the inode
153 * block. We read the inode with gfs2_inode_refresh
154 * after possibly checking the block type.
155 */
156 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
157 GL_SKIP, &i_gh);
158 if (error)
159 goto fail_put;
160
161 if (blktype != GFS2_BLKST_FREE) {
162 error = gfs2_check_blk_type(sdp, no_addr,
163 blktype);
164 if (error)
165 goto fail_put;
166 }
167 }
168
169 glock_set_object(ip->i_gl, ip);
170 set_bit(GIF_INVALID, &ip->i_flags);
171 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
172 if (unlikely(error))
173 goto fail_put;
174 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
175 gfs2_glock_put(io_gl);
176 io_gl = NULL;
177
178 if (type == DT_UNKNOWN) {
179 /* Inode glock must be locked already */
180 error = gfs2_inode_refresh(GFS2_I(inode));
181 if (error)
182 goto fail_refresh;
183 } else {
184 inode->i_mode = DT2IF(type);
185 }
186
187 gfs2_set_iop(inode);
188
189 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
190 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
191 inode->i_atime.tv_nsec = 0;
192
193 unlock_new_inode(inode);
194 }
195
196 if (gfs2_holder_initialized(&i_gh))
197 gfs2_glock_dq_uninit(&i_gh);
198 return inode;
199
200fail_refresh:
201 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
202 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
203 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
204fail_put:
205 if (io_gl)
206 gfs2_glock_put(io_gl);
207 glock_clear_object(ip->i_gl, ip);
208 if (gfs2_holder_initialized(&i_gh))
209 gfs2_glock_dq_uninit(&i_gh);
210fail:
211 iget_failed(inode);
212 return ERR_PTR(error);
213}
214
215struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
216 u64 *no_formal_ino, unsigned int blktype)
217{
218 struct super_block *sb = sdp->sd_vfs;
219 struct inode *inode;
220 int error;
221
222 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
223 if (IS_ERR(inode))
224 return inode;
225
226 /* Two extra checks for NFS only */
227 if (no_formal_ino) {
228 error = -ESTALE;
229 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
230 goto fail_iput;
231
232 error = -EIO;
233 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
234 goto fail_iput;
235 }
236 return inode;
237
238fail_iput:
239 iput(inode);
240 return ERR_PTR(error);
241}
242
243
244struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
245{
246 struct qstr qstr;
247 struct inode *inode;
248 gfs2_str2qstr(&qstr, name);
249 inode = gfs2_lookupi(dip, &qstr, 1);
250 /* gfs2_lookupi has inconsistent callers: vfs
251 * related routines expect NULL for no entry found,
252 * gfs2_lookup_simple callers expect ENOENT
253 * and do not check for NULL.
254 */
255 if (inode == NULL)
256 return ERR_PTR(-ENOENT);
257 else
258 return inode;
259}
260
261
262/**
263 * gfs2_lookupi - Look up a filename in a directory and return its inode
264 * @d_gh: An initialized holder for the directory glock
265 * @name: The name of the inode to look for
266 * @is_root: If 1, ignore the caller's permissions
267 * @i_gh: An uninitialized holder for the new inode glock
268 *
269 * This can be called via the VFS filldir function when NFS is doing
270 * a readdirplus and the inode which its intending to stat isn't
271 * already in cache. In this case we must not take the directory glock
272 * again, since the readdir call will have already taken that lock.
273 *
274 * Returns: errno
275 */
276
277struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
278 int is_root)
279{
280 struct super_block *sb = dir->i_sb;
281 struct gfs2_inode *dip = GFS2_I(dir);
282 struct gfs2_holder d_gh;
283 int error = 0;
284 struct inode *inode = NULL;
285
286 gfs2_holder_mark_uninitialized(&d_gh);
287 if (!name->len || name->len > GFS2_FNAMESIZE)
288 return ERR_PTR(-ENAMETOOLONG);
289
290 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
291 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
292 dir == d_inode(sb->s_root))) {
293 igrab(dir);
294 return dir;
295 }
296
297 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
298 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
299 if (error)
300 return ERR_PTR(error);
301 }
302
303 if (!is_root) {
304 error = gfs2_permission(dir, MAY_EXEC);
305 if (error)
306 goto out;
307 }
308
309 inode = gfs2_dir_search(dir, name, false);
310 if (IS_ERR(inode))
311 error = PTR_ERR(inode);
312out:
313 if (gfs2_holder_initialized(&d_gh))
314 gfs2_glock_dq_uninit(&d_gh);
315 if (error == -ENOENT)
316 return NULL;
317 return inode ? inode : ERR_PTR(error);
318}
319
320/**
321 * create_ok - OK to create a new on-disk inode here?
322 * @dip: Directory in which dinode is to be created
323 * @name: Name of new dinode
324 * @mode:
325 *
326 * Returns: errno
327 */
328
329static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
330 umode_t mode)
331{
332 int error;
333
334 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
335 if (error)
336 return error;
337
338 /* Don't create entries in an unlinked directory */
339 if (!dip->i_inode.i_nlink)
340 return -ENOENT;
341
342 if (dip->i_entries == (u32)-1)
343 return -EFBIG;
344 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
345 return -EMLINK;
346
347 return 0;
348}
349
350static void munge_mode_uid_gid(const struct gfs2_inode *dip,
351 struct inode *inode)
352{
353 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
354 (dip->i_inode.i_mode & S_ISUID) &&
355 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
356 if (S_ISDIR(inode->i_mode))
357 inode->i_mode |= S_ISUID;
358 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
359 inode->i_mode &= ~07111;
360 inode->i_uid = dip->i_inode.i_uid;
361 } else
362 inode->i_uid = current_fsuid();
363
364 if (dip->i_inode.i_mode & S_ISGID) {
365 if (S_ISDIR(inode->i_mode))
366 inode->i_mode |= S_ISGID;
367 inode->i_gid = dip->i_inode.i_gid;
368 } else
369 inode->i_gid = current_fsgid();
370}
371
372static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
373{
374 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
375 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
376 int error;
377
378 error = gfs2_quota_lock_check(ip, &ap);
379 if (error)
380 goto out;
381
382 error = gfs2_inplace_reserve(ip, &ap);
383 if (error)
384 goto out_quota;
385
386 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
387 if (error)
388 goto out_ipreserv;
389
390 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
391 ip->i_no_formal_ino = ip->i_generation;
392 ip->i_inode.i_ino = ip->i_no_addr;
393 ip->i_goal = ip->i_no_addr;
394
395 gfs2_trans_end(sdp);
396
397out_ipreserv:
398 gfs2_inplace_release(ip);
399out_quota:
400 gfs2_quota_unlock(ip);
401out:
402 return error;
403}
404
405static void gfs2_init_dir(struct buffer_head *dibh,
406 const struct gfs2_inode *parent)
407{
408 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
409 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
410
411 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
412 dent->de_inum = di->di_num; /* already GFS2 endian */
413 dent->de_type = cpu_to_be16(DT_DIR);
414
415 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
416 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
417 gfs2_inum_out(parent, dent);
418 dent->de_type = cpu_to_be16(DT_DIR);
419
420}
421
422/**
423 * gfs2_init_xattr - Initialise an xattr block for a new inode
424 * @ip: The inode in question
425 *
426 * This sets up an empty xattr block for a new inode, ready to
427 * take any ACLs, LSM xattrs, etc.
428 */
429
430static void gfs2_init_xattr(struct gfs2_inode *ip)
431{
432 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
433 struct buffer_head *bh;
434 struct gfs2_ea_header *ea;
435
436 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
437 gfs2_trans_add_meta(ip->i_gl, bh);
438 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
439 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
440
441 ea = GFS2_EA_BH2FIRST(bh);
442 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
443 ea->ea_type = GFS2_EATYPE_UNUSED;
444 ea->ea_flags = GFS2_EAFLAG_LAST;
445
446 brelse(bh);
447}
448
449/**
450 * init_dinode - Fill in a new dinode structure
451 * @dip: The directory this inode is being created in
452 * @ip: The inode
453 * @symname: The symlink destination (if a symlink)
454 * @bhp: The buffer head (returned to caller)
455 *
456 */
457
458static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
459 const char *symname)
460{
461 struct gfs2_dinode *di;
462 struct buffer_head *dibh;
463
464 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
465 gfs2_trans_add_meta(ip->i_gl, dibh);
466 di = (struct gfs2_dinode *)dibh->b_data;
467 gfs2_dinode_out(ip, di);
468
469 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
470 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
471 di->__pad1 = 0;
472 di->__pad2 = 0;
473 di->__pad3 = 0;
474 memset(&di->__pad4, 0, sizeof(di->__pad4));
475 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
476 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
477
478 switch(ip->i_inode.i_mode & S_IFMT) {
479 case S_IFDIR:
480 gfs2_init_dir(dibh, dip);
481 break;
482 case S_IFLNK:
483 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
484 break;
485 }
486
487 set_buffer_uptodate(dibh);
488 brelse(dibh);
489}
490
491/**
492 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
493 * @dip: The directory we are linking into
494 * @da: The dir add information
495 * @nr_inodes: The number of inodes involved
496 *
497 * This calculate the number of blocks we need to reserve in a
498 * transaction to link @nr_inodes into a directory. In most cases
499 * @nr_inodes will be 2 (the directory plus the inode being linked in)
500 * but in case of rename, 4 may be required.
501 *
502 * Returns: Number of blocks
503 */
504
505static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
506 const struct gfs2_diradd *da,
507 unsigned nr_inodes)
508{
509 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
510 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
511}
512
513static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
514 struct gfs2_inode *ip, struct gfs2_diradd *da)
515{
516 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
517 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
518 int error;
519
520 if (da->nr_blocks) {
521 error = gfs2_quota_lock_check(dip, &ap);
522 if (error)
523 goto fail_quota_locks;
524
525 error = gfs2_inplace_reserve(dip, &ap);
526 if (error)
527 goto fail_quota_locks;
528
529 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
530 if (error)
531 goto fail_ipreserv;
532 } else {
533 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
534 if (error)
535 goto fail_quota_locks;
536 }
537
538 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
539
540 gfs2_trans_end(sdp);
541fail_ipreserv:
542 gfs2_inplace_release(dip);
543fail_quota_locks:
544 gfs2_quota_unlock(dip);
545 return error;
546}
547
548static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
549 void *fs_info)
550{
551 const struct xattr *xattr;
552 int err = 0;
553
554 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
555 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
556 xattr->value_len, 0,
557 GFS2_EATYPE_SECURITY);
558 if (err < 0)
559 break;
560 }
561 return err;
562}
563
564/**
565 * gfs2_create_inode - Create a new inode
566 * @dir: The parent directory
567 * @dentry: The new dentry
568 * @file: If non-NULL, the file which is being opened
569 * @mode: The permissions on the new inode
570 * @dev: For device nodes, this is the device number
571 * @symname: For symlinks, this is the link destination
572 * @size: The initial size of the inode (ignored for directories)
573 *
574 * Returns: 0 on success, or error code
575 */
576
577static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
578 struct file *file,
579 umode_t mode, dev_t dev, const char *symname,
580 unsigned int size, int excl)
581{
582 const struct qstr *name = &dentry->d_name;
583 struct posix_acl *default_acl, *acl;
584 struct gfs2_holder ghs[2];
585 struct inode *inode = NULL;
586 struct gfs2_inode *dip = GFS2_I(dir), *ip;
587 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
588 struct gfs2_glock *io_gl = NULL;
589 int error, free_vfs_inode = 1;
590 u32 aflags = 0;
591 unsigned blocks = 1;
592 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
593
594 if (!name->len || name->len > GFS2_FNAMESIZE)
595 return -ENAMETOOLONG;
596
597 error = gfs2_rsqa_alloc(dip);
598 if (error)
599 return error;
600
601 error = gfs2_rindex_update(sdp);
602 if (error)
603 return error;
604
605 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
606 if (error)
607 goto fail;
608 gfs2_holder_mark_uninitialized(ghs + 1);
609
610 error = create_ok(dip, name, mode);
611 if (error)
612 goto fail_gunlock;
613
614 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
615 error = PTR_ERR(inode);
616 if (!IS_ERR(inode)) {
617 if (S_ISDIR(inode->i_mode)) {
618 iput(inode);
619 inode = ERR_PTR(-EISDIR);
620 goto fail_gunlock;
621 }
622 d_instantiate(dentry, inode);
623 error = 0;
624 if (file) {
625 if (S_ISREG(inode->i_mode))
626 error = finish_open(file, dentry, gfs2_open_common);
627 else
628 error = finish_no_open(file, NULL);
629 }
630 gfs2_glock_dq_uninit(ghs);
631 return error;
632 } else if (error != -ENOENT) {
633 goto fail_gunlock;
634 }
635
636 error = gfs2_diradd_alloc_required(dir, name, &da);
637 if (error < 0)
638 goto fail_gunlock;
639
640 inode = new_inode(sdp->sd_vfs);
641 error = -ENOMEM;
642 if (!inode)
643 goto fail_gunlock;
644
645 error = posix_acl_create(dir, &mode, &default_acl, &acl);
646 if (error)
647 goto fail_gunlock;
648
649 ip = GFS2_I(inode);
650 error = gfs2_rsqa_alloc(ip);
651 if (error)
652 goto fail_free_acls;
653
654 inode->i_mode = mode;
655 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
656 inode->i_rdev = dev;
657 inode->i_size = size;
658 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
659 gfs2_set_inode_blocks(inode, 1);
660 munge_mode_uid_gid(dip, inode);
661 check_and_update_goal(dip);
662 ip->i_goal = dip->i_goal;
663 ip->i_diskflags = 0;
664 ip->i_eattr = 0;
665 ip->i_height = 0;
666 ip->i_depth = 0;
667 ip->i_entries = 0;
668 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
669
670 switch(mode & S_IFMT) {
671 case S_IFREG:
672 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
673 gfs2_tune_get(sdp, gt_new_files_jdata))
674 ip->i_diskflags |= GFS2_DIF_JDATA;
675 gfs2_set_aops(inode);
676 break;
677 case S_IFDIR:
678 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
679 ip->i_diskflags |= GFS2_DIF_JDATA;
680 ip->i_entries = 2;
681 break;
682 }
683
684 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
685 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
686 ip->i_diskflags |= GFS2_DIF_SYSTEM;
687
688 gfs2_set_inode_flags(inode);
689
690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
691 (dip->i_diskflags & GFS2_DIF_TOPDIR))
692 aflags |= GFS2_AF_ORLOV;
693
694 if (default_acl || acl)
695 blocks++;
696
697 error = alloc_dinode(ip, aflags, &blocks);
698 if (error)
699 goto fail_free_inode;
700
701 gfs2_set_inode_blocks(inode, blocks);
702
703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704 if (error)
705 goto fail_free_inode;
706 flush_delayed_work(&ip->i_gl->gl_work);
707 glock_set_object(ip->i_gl, ip);
708
709 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
710 if (error)
711 goto fail_free_inode;
712
713 error = gfs2_trans_begin(sdp, blocks, 0);
714 if (error)
715 goto fail_gunlock2;
716
717 if (blocks > 1) {
718 ip->i_eattr = ip->i_no_addr + 1;
719 gfs2_init_xattr(ip);
720 }
721 init_dinode(dip, ip, symname);
722 gfs2_trans_end(sdp);
723
724 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
725 if (error)
726 goto fail_gunlock2;
727
728 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
729
730 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
731 if (error)
732 goto fail_gunlock2;
733
734 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
735 gfs2_glock_put(io_gl);
736 gfs2_set_iop(inode);
737 insert_inode_hash(inode);
738
739 free_vfs_inode = 0; /* After this point, the inode is no longer
740 considered free. Any failures need to undo
741 the gfs2 structures. */
742 if (default_acl) {
743 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
744 if (error)
745 goto fail_gunlock3;
746 posix_acl_release(default_acl);
747 default_acl = NULL;
748 }
749 if (acl) {
750 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
751 if (error)
752 goto fail_gunlock3;
753 posix_acl_release(acl);
754 acl = NULL;
755 }
756
757 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
758 &gfs2_initxattrs, NULL);
759 if (error)
760 goto fail_gunlock3;
761
762 error = link_dinode(dip, name, ip, &da);
763 if (error)
764 goto fail_gunlock3;
765
766 mark_inode_dirty(inode);
767 d_instantiate(dentry, inode);
768 if (file) {
769 file->f_mode |= FMODE_CREATED;
770 error = finish_open(file, dentry, gfs2_open_common);
771 }
772 gfs2_glock_dq_uninit(ghs);
773 gfs2_glock_dq_uninit(ghs + 1);
774 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
775 return error;
776
777fail_gunlock3:
778 glock_clear_object(io_gl, ip);
779 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
780 gfs2_glock_put(io_gl);
781fail_gunlock2:
782 if (io_gl)
783 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
784fail_free_inode:
785 if (ip->i_gl) {
786 glock_clear_object(ip->i_gl, ip);
787 gfs2_glock_put(ip->i_gl);
788 }
789 gfs2_rsqa_delete(ip, NULL);
790fail_free_acls:
791 posix_acl_release(default_acl);
792 posix_acl_release(acl);
793fail_gunlock:
794 gfs2_dir_no_add(&da);
795 gfs2_glock_dq_uninit(ghs);
796 if (!IS_ERR_OR_NULL(inode)) {
797 clear_nlink(inode);
798 if (!free_vfs_inode)
799 mark_inode_dirty(inode);
800 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
801 &GFS2_I(inode)->i_flags);
802 iput(inode);
803 }
804 if (gfs2_holder_initialized(ghs + 1))
805 gfs2_glock_dq_uninit(ghs + 1);
806fail:
807 return error;
808}
809
810/**
811 * gfs2_create - Create a file
812 * @dir: The directory in which to create the file
813 * @dentry: The dentry of the new file
814 * @mode: The mode of the new file
815 *
816 * Returns: errno
817 */
818
819static int gfs2_create(struct inode *dir, struct dentry *dentry,
820 umode_t mode, bool excl)
821{
822 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
823}
824
825/**
826 * __gfs2_lookup - Look up a filename in a directory and return its inode
827 * @dir: The directory inode
828 * @dentry: The dentry of the new inode
829 * @file: File to be opened
830 *
831 *
832 * Returns: errno
833 */
834
835static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
836 struct file *file)
837{
838 struct inode *inode;
839 struct dentry *d;
840 struct gfs2_holder gh;
841 struct gfs2_glock *gl;
842 int error;
843
844 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
845 if (inode == NULL) {
846 d_add(dentry, NULL);
847 return NULL;
848 }
849 if (IS_ERR(inode))
850 return ERR_CAST(inode);
851
852 gl = GFS2_I(inode)->i_gl;
853 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
854 if (error) {
855 iput(inode);
856 return ERR_PTR(error);
857 }
858
859 d = d_splice_alias(inode, dentry);
860 if (IS_ERR(d)) {
861 gfs2_glock_dq_uninit(&gh);
862 return d;
863 }
864 if (file && S_ISREG(inode->i_mode))
865 error = finish_open(file, dentry, gfs2_open_common);
866
867 gfs2_glock_dq_uninit(&gh);
868 if (error) {
869 dput(d);
870 return ERR_PTR(error);
871 }
872 return d;
873}
874
875static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
876 unsigned flags)
877{
878 return __gfs2_lookup(dir, dentry, NULL);
879}
880
881/**
882 * gfs2_link - Link to a file
883 * @old_dentry: The inode to link
884 * @dir: Add link to this directory
885 * @dentry: The name of the link
886 *
887 * Link the inode in "old_dentry" into the directory "dir" with the
888 * name in "dentry".
889 *
890 * Returns: errno
891 */
892
893static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
894 struct dentry *dentry)
895{
896 struct gfs2_inode *dip = GFS2_I(dir);
897 struct gfs2_sbd *sdp = GFS2_SB(dir);
898 struct inode *inode = d_inode(old_dentry);
899 struct gfs2_inode *ip = GFS2_I(inode);
900 struct gfs2_holder ghs[2];
901 struct buffer_head *dibh;
902 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
903 int error;
904
905 if (S_ISDIR(inode->i_mode))
906 return -EPERM;
907
908 error = gfs2_rsqa_alloc(dip);
909 if (error)
910 return error;
911
912 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
913 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
914
915 error = gfs2_glock_nq(ghs); /* parent */
916 if (error)
917 goto out_parent;
918
919 error = gfs2_glock_nq(ghs + 1); /* child */
920 if (error)
921 goto out_child;
922
923 error = -ENOENT;
924 if (inode->i_nlink == 0)
925 goto out_gunlock;
926
927 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
928 if (error)
929 goto out_gunlock;
930
931 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
932 switch (error) {
933 case -ENOENT:
934 break;
935 case 0:
936 error = -EEXIST;
937 default:
938 goto out_gunlock;
939 }
940
941 error = -EINVAL;
942 if (!dip->i_inode.i_nlink)
943 goto out_gunlock;
944 error = -EFBIG;
945 if (dip->i_entries == (u32)-1)
946 goto out_gunlock;
947 error = -EPERM;
948 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
949 goto out_gunlock;
950 error = -EINVAL;
951 if (!ip->i_inode.i_nlink)
952 goto out_gunlock;
953 error = -EMLINK;
954 if (ip->i_inode.i_nlink == (u32)-1)
955 goto out_gunlock;
956
957 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
958 if (error < 0)
959 goto out_gunlock;
960
961 if (da.nr_blocks) {
962 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
963 error = gfs2_quota_lock_check(dip, &ap);
964 if (error)
965 goto out_gunlock;
966
967 error = gfs2_inplace_reserve(dip, &ap);
968 if (error)
969 goto out_gunlock_q;
970
971 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
972 if (error)
973 goto out_ipres;
974 } else {
975 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
976 if (error)
977 goto out_ipres;
978 }
979
980 error = gfs2_meta_inode_buffer(ip, &dibh);
981 if (error)
982 goto out_end_trans;
983
984 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
985 if (error)
986 goto out_brelse;
987
988 gfs2_trans_add_meta(ip->i_gl, dibh);
989 inc_nlink(&ip->i_inode);
990 ip->i_inode.i_ctime = current_time(&ip->i_inode);
991 ihold(inode);
992 d_instantiate(dentry, inode);
993 mark_inode_dirty(inode);
994
995out_brelse:
996 brelse(dibh);
997out_end_trans:
998 gfs2_trans_end(sdp);
999out_ipres:
1000 if (da.nr_blocks)
1001 gfs2_inplace_release(dip);
1002out_gunlock_q:
1003 if (da.nr_blocks)
1004 gfs2_quota_unlock(dip);
1005out_gunlock:
1006 gfs2_dir_no_add(&da);
1007 gfs2_glock_dq(ghs + 1);
1008out_child:
1009 gfs2_glock_dq(ghs);
1010out_parent:
1011 gfs2_holder_uninit(ghs);
1012 gfs2_holder_uninit(ghs + 1);
1013 return error;
1014}
1015
1016/*
1017 * gfs2_unlink_ok - check to see that a inode is still in a directory
1018 * @dip: the directory
1019 * @name: the name of the file
1020 * @ip: the inode
1021 *
1022 * Assumes that the lock on (at least) @dip is held.
1023 *
1024 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1025 */
1026
1027static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1028 const struct gfs2_inode *ip)
1029{
1030 int error;
1031
1032 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1033 return -EPERM;
1034
1035 if ((dip->i_inode.i_mode & S_ISVTX) &&
1036 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1037 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1038 return -EPERM;
1039
1040 if (IS_APPEND(&dip->i_inode))
1041 return -EPERM;
1042
1043 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1044 if (error)
1045 return error;
1046
1047 return gfs2_dir_check(&dip->i_inode, name, ip);
1048}
1049
1050/**
1051 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1052 * @dip: The parent directory
1053 * @name: The name of the entry in the parent directory
1054 * @inode: The inode to be removed
1055 *
1056 * Called with all the locks and in a transaction. This will only be
1057 * called for a directory after it has been checked to ensure it is empty.
1058 *
1059 * Returns: 0 on success, or an error
1060 */
1061
1062static int gfs2_unlink_inode(struct gfs2_inode *dip,
1063 const struct dentry *dentry)
1064{
1065 struct inode *inode = d_inode(dentry);
1066 struct gfs2_inode *ip = GFS2_I(inode);
1067 int error;
1068
1069 error = gfs2_dir_del(dip, dentry);
1070 if (error)
1071 return error;
1072
1073 ip->i_entries = 0;
1074 inode->i_ctime = current_time(inode);
1075 if (S_ISDIR(inode->i_mode))
1076 clear_nlink(inode);
1077 else
1078 drop_nlink(inode);
1079 mark_inode_dirty(inode);
1080 if (inode->i_nlink == 0)
1081 gfs2_unlink_di(inode);
1082 return 0;
1083}
1084
1085
1086/**
1087 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1088 * @dir: The inode of the directory containing the inode to unlink
1089 * @dentry: The file itself
1090 *
1091 * This routine uses the type of the inode as a flag to figure out
1092 * whether this is an unlink or an rmdir.
1093 *
1094 * Returns: errno
1095 */
1096
1097static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1098{
1099 struct gfs2_inode *dip = GFS2_I(dir);
1100 struct gfs2_sbd *sdp = GFS2_SB(dir);
1101 struct inode *inode = d_inode(dentry);
1102 struct gfs2_inode *ip = GFS2_I(inode);
1103 struct gfs2_holder ghs[3];
1104 struct gfs2_rgrpd *rgd;
1105 int error;
1106
1107 error = gfs2_rindex_update(sdp);
1108 if (error)
1109 return error;
1110
1111 error = -EROFS;
1112
1113 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1114 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1115
1116 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1117 if (!rgd)
1118 goto out_inodes;
1119
1120 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1121
1122
1123 error = gfs2_glock_nq(ghs); /* parent */
1124 if (error)
1125 goto out_parent;
1126
1127 error = gfs2_glock_nq(ghs + 1); /* child */
1128 if (error)
1129 goto out_child;
1130
1131 error = -ENOENT;
1132 if (inode->i_nlink == 0)
1133 goto out_rgrp;
1134
1135 if (S_ISDIR(inode->i_mode)) {
1136 error = -ENOTEMPTY;
1137 if (ip->i_entries > 2 || inode->i_nlink > 2)
1138 goto out_rgrp;
1139 }
1140
1141 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1142 if (error)
1143 goto out_rgrp;
1144
1145 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1146 if (error)
1147 goto out_gunlock;
1148
1149 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1150 if (error)
1151 goto out_gunlock;
1152
1153 error = gfs2_unlink_inode(dip, dentry);
1154 gfs2_trans_end(sdp);
1155
1156out_gunlock:
1157 gfs2_glock_dq(ghs + 2);
1158out_rgrp:
1159 gfs2_glock_dq(ghs + 1);
1160out_child:
1161 gfs2_glock_dq(ghs);
1162out_parent:
1163 gfs2_holder_uninit(ghs + 2);
1164out_inodes:
1165 gfs2_holder_uninit(ghs + 1);
1166 gfs2_holder_uninit(ghs);
1167 return error;
1168}
1169
1170/**
1171 * gfs2_symlink - Create a symlink
1172 * @dir: The directory to create the symlink in
1173 * @dentry: The dentry to put the symlink in
1174 * @symname: The thing which the link points to
1175 *
1176 * Returns: errno
1177 */
1178
1179static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1180 const char *symname)
1181{
1182 unsigned int size;
1183
1184 size = strlen(symname);
1185 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1186 return -ENAMETOOLONG;
1187
1188 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1189}
1190
1191/**
1192 * gfs2_mkdir - Make a directory
1193 * @dir: The parent directory of the new one
1194 * @dentry: The dentry of the new directory
1195 * @mode: The mode of the new directory
1196 *
1197 * Returns: errno
1198 */
1199
1200static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1201{
1202 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1203 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1204}
1205
1206/**
1207 * gfs2_mknod - Make a special file
1208 * @dir: The directory in which the special file will reside
1209 * @dentry: The dentry of the special file
1210 * @mode: The mode of the special file
1211 * @dev: The device specification of the special file
1212 *
1213 */
1214
1215static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1216 dev_t dev)
1217{
1218 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1219}
1220
1221/**
1222 * gfs2_atomic_open - Atomically open a file
1223 * @dir: The directory
1224 * @dentry: The proposed new entry
1225 * @file: The proposed new struct file
1226 * @flags: open flags
1227 * @mode: File mode
1228 *
1229 * Returns: error code or 0 for success
1230 */
1231
1232static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1233 struct file *file, unsigned flags,
1234 umode_t mode)
1235{
1236 struct dentry *d;
1237 bool excl = !!(flags & O_EXCL);
1238
1239 if (!d_in_lookup(dentry))
1240 goto skip_lookup;
1241
1242 d = __gfs2_lookup(dir, dentry, file);
1243 if (IS_ERR(d))
1244 return PTR_ERR(d);
1245 if (d != NULL)
1246 dentry = d;
1247 if (d_really_is_positive(dentry)) {
1248 if (!(file->f_mode & FMODE_OPENED))
1249 return finish_no_open(file, d);
1250 dput(d);
1251 return 0;
1252 }
1253
1254 BUG_ON(d != NULL);
1255
1256skip_lookup:
1257 if (!(flags & O_CREAT))
1258 return -ENOENT;
1259
1260 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1261}
1262
1263/*
1264 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1265 * @this: move this
1266 * @to: to here
1267 *
1268 * Follow @to back to the root and make sure we don't encounter @this
1269 * Assumes we already hold the rename lock.
1270 *
1271 * Returns: errno
1272 */
1273
1274static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1275{
1276 struct inode *dir = &to->i_inode;
1277 struct super_block *sb = dir->i_sb;
1278 struct inode *tmp;
1279 int error = 0;
1280
1281 igrab(dir);
1282
1283 for (;;) {
1284 if (dir == &this->i_inode) {
1285 error = -EINVAL;
1286 break;
1287 }
1288 if (dir == d_inode(sb->s_root)) {
1289 error = 0;
1290 break;
1291 }
1292
1293 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1294 if (!tmp) {
1295 error = -ENOENT;
1296 break;
1297 }
1298 if (IS_ERR(tmp)) {
1299 error = PTR_ERR(tmp);
1300 break;
1301 }
1302
1303 iput(dir);
1304 dir = tmp;
1305 }
1306
1307 iput(dir);
1308
1309 return error;
1310}
1311
1312/**
1313 * update_moved_ino - Update an inode that's being moved
1314 * @ip: The inode being moved
1315 * @ndip: The parent directory of the new filename
1316 * @dir_rename: True of ip is a directory
1317 *
1318 * Returns: errno
1319 */
1320
1321static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1322 int dir_rename)
1323{
1324 if (dir_rename)
1325 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326
1327 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1328 mark_inode_dirty_sync(&ip->i_inode);
1329 return 0;
1330}
1331
1332
1333/**
1334 * gfs2_rename - Rename a file
1335 * @odir: Parent directory of old file name
1336 * @odentry: The old dentry of the file
1337 * @ndir: Parent directory of new file name
1338 * @ndentry: The new dentry of the file
1339 *
1340 * Returns: errno
1341 */
1342
1343static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1344 struct inode *ndir, struct dentry *ndentry)
1345{
1346 struct gfs2_inode *odip = GFS2_I(odir);
1347 struct gfs2_inode *ndip = GFS2_I(ndir);
1348 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1349 struct gfs2_inode *nip = NULL;
1350 struct gfs2_sbd *sdp = GFS2_SB(odir);
1351 struct gfs2_holder ghs[4], r_gh, rd_gh;
1352 struct gfs2_rgrpd *nrgd;
1353 unsigned int num_gh;
1354 int dir_rename = 0;
1355 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1356 unsigned int x;
1357 int error;
1358
1359 gfs2_holder_mark_uninitialized(&r_gh);
1360 gfs2_holder_mark_uninitialized(&rd_gh);
1361 if (d_really_is_positive(ndentry)) {
1362 nip = GFS2_I(d_inode(ndentry));
1363 if (ip == nip)
1364 return 0;
1365 }
1366
1367 error = gfs2_rindex_update(sdp);
1368 if (error)
1369 return error;
1370
1371 error = gfs2_rsqa_alloc(ndip);
1372 if (error)
1373 return error;
1374
1375 if (odip != ndip) {
1376 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1377 0, &r_gh);
1378 if (error)
1379 goto out;
1380
1381 if (S_ISDIR(ip->i_inode.i_mode)) {
1382 dir_rename = 1;
1383 /* don't move a directory into its subdir */
1384 error = gfs2_ok_to_move(ip, ndip);
1385 if (error)
1386 goto out_gunlock_r;
1387 }
1388 }
1389
1390 num_gh = 1;
1391 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1392 if (odip != ndip) {
1393 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1394 ghs + num_gh);
1395 num_gh++;
1396 }
1397 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1398 num_gh++;
1399
1400 if (nip) {
1401 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1402 ghs + num_gh);
1403 num_gh++;
1404 }
1405
1406 for (x = 0; x < num_gh; x++) {
1407 error = gfs2_glock_nq(ghs + x);
1408 if (error)
1409 goto out_gunlock;
1410 }
1411 error = gfs2_glock_async_wait(num_gh, ghs);
1412 if (error)
1413 goto out_gunlock;
1414
1415 if (nip) {
1416 /* Grab the resource group glock for unlink flag twiddling.
1417 * This is the case where the target dinode already exists
1418 * so we unlink before doing the rename.
1419 */
1420 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1421 if (!nrgd) {
1422 error = -ENOENT;
1423 goto out_gunlock;
1424 }
1425 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1426 &rd_gh);
1427 if (error)
1428 goto out_gunlock;
1429 }
1430
1431 error = -ENOENT;
1432 if (ip->i_inode.i_nlink == 0)
1433 goto out_gunlock;
1434
1435 /* Check out the old directory */
1436
1437 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1438 if (error)
1439 goto out_gunlock;
1440
1441 /* Check out the new directory */
1442
1443 if (nip) {
1444 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1445 if (error)
1446 goto out_gunlock;
1447
1448 if (nip->i_inode.i_nlink == 0) {
1449 error = -EAGAIN;
1450 goto out_gunlock;
1451 }
1452
1453 if (S_ISDIR(nip->i_inode.i_mode)) {
1454 if (nip->i_entries < 2) {
1455 gfs2_consist_inode(nip);
1456 error = -EIO;
1457 goto out_gunlock;
1458 }
1459 if (nip->i_entries > 2) {
1460 error = -ENOTEMPTY;
1461 goto out_gunlock;
1462 }
1463 }
1464 } else {
1465 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1466 if (error)
1467 goto out_gunlock;
1468
1469 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1470 switch (error) {
1471 case -ENOENT:
1472 error = 0;
1473 break;
1474 case 0:
1475 error = -EEXIST;
1476 default:
1477 goto out_gunlock;
1478 };
1479
1480 if (odip != ndip) {
1481 if (!ndip->i_inode.i_nlink) {
1482 error = -ENOENT;
1483 goto out_gunlock;
1484 }
1485 if (ndip->i_entries == (u32)-1) {
1486 error = -EFBIG;
1487 goto out_gunlock;
1488 }
1489 if (S_ISDIR(ip->i_inode.i_mode) &&
1490 ndip->i_inode.i_nlink == (u32)-1) {
1491 error = -EMLINK;
1492 goto out_gunlock;
1493 }
1494 }
1495 }
1496
1497 /* Check out the dir to be renamed */
1498
1499 if (dir_rename) {
1500 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1501 if (error)
1502 goto out_gunlock;
1503 }
1504
1505 if (nip == NULL) {
1506 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1507 if (error)
1508 goto out_gunlock;
1509 }
1510
1511 if (da.nr_blocks) {
1512 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1513 error = gfs2_quota_lock_check(ndip, &ap);
1514 if (error)
1515 goto out_gunlock;
1516
1517 error = gfs2_inplace_reserve(ndip, &ap);
1518 if (error)
1519 goto out_gunlock_q;
1520
1521 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1522 4 * RES_LEAF + 4, 0);
1523 if (error)
1524 goto out_ipreserv;
1525 } else {
1526 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1527 5 * RES_LEAF + 4, 0);
1528 if (error)
1529 goto out_gunlock;
1530 }
1531
1532 /* Remove the target file, if it exists */
1533
1534 if (nip)
1535 error = gfs2_unlink_inode(ndip, ndentry);
1536
1537 error = update_moved_ino(ip, ndip, dir_rename);
1538 if (error)
1539 goto out_end_trans;
1540
1541 error = gfs2_dir_del(odip, odentry);
1542 if (error)
1543 goto out_end_trans;
1544
1545 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1546 if (error)
1547 goto out_end_trans;
1548
1549out_end_trans:
1550 gfs2_trans_end(sdp);
1551out_ipreserv:
1552 if (da.nr_blocks)
1553 gfs2_inplace_release(ndip);
1554out_gunlock_q:
1555 if (da.nr_blocks)
1556 gfs2_quota_unlock(ndip);
1557out_gunlock:
1558 gfs2_dir_no_add(&da);
1559 if (gfs2_holder_initialized(&rd_gh))
1560 gfs2_glock_dq_uninit(&rd_gh);
1561
1562 while (x--) {
1563 if (gfs2_holder_queued(ghs + x))
1564 gfs2_glock_dq(ghs + x);
1565 gfs2_holder_uninit(ghs + x);
1566 }
1567out_gunlock_r:
1568 if (gfs2_holder_initialized(&r_gh))
1569 gfs2_glock_dq_uninit(&r_gh);
1570out:
1571 return error;
1572}
1573
1574/**
1575 * gfs2_exchange - exchange two files
1576 * @odir: Parent directory of old file name
1577 * @odentry: The old dentry of the file
1578 * @ndir: Parent directory of new file name
1579 * @ndentry: The new dentry of the file
1580 * @flags: The rename flags
1581 *
1582 * Returns: errno
1583 */
1584
1585static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1586 struct inode *ndir, struct dentry *ndentry,
1587 unsigned int flags)
1588{
1589 struct gfs2_inode *odip = GFS2_I(odir);
1590 struct gfs2_inode *ndip = GFS2_I(ndir);
1591 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1592 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1593 struct gfs2_sbd *sdp = GFS2_SB(odir);
1594 struct gfs2_holder ghs[4], r_gh;
1595 unsigned int num_gh;
1596 unsigned int x;
1597 umode_t old_mode = oip->i_inode.i_mode;
1598 umode_t new_mode = nip->i_inode.i_mode;
1599 int error;
1600
1601 gfs2_holder_mark_uninitialized(&r_gh);
1602 error = gfs2_rindex_update(sdp);
1603 if (error)
1604 return error;
1605
1606 if (odip != ndip) {
1607 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1608 0, &r_gh);
1609 if (error)
1610 goto out;
1611
1612 if (S_ISDIR(old_mode)) {
1613 /* don't move a directory into its subdir */
1614 error = gfs2_ok_to_move(oip, ndip);
1615 if (error)
1616 goto out_gunlock_r;
1617 }
1618
1619 if (S_ISDIR(new_mode)) {
1620 /* don't move a directory into its subdir */
1621 error = gfs2_ok_to_move(nip, odip);
1622 if (error)
1623 goto out_gunlock_r;
1624 }
1625 }
1626
1627 num_gh = 1;
1628 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1629 if (odip != ndip) {
1630 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1631 ghs + num_gh);
1632 num_gh++;
1633 }
1634 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1635 num_gh++;
1636
1637 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1638 num_gh++;
1639
1640 for (x = 0; x < num_gh; x++) {
1641 error = gfs2_glock_nq(ghs + x);
1642 if (error)
1643 goto out_gunlock;
1644 }
1645
1646 error = gfs2_glock_async_wait(num_gh, ghs);
1647 if (error)
1648 goto out_gunlock;
1649
1650 error = -ENOENT;
1651 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1652 goto out_gunlock;
1653
1654 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1655 if (error)
1656 goto out_gunlock;
1657 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1658 if (error)
1659 goto out_gunlock;
1660
1661 if (S_ISDIR(old_mode)) {
1662 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1663 if (error)
1664 goto out_gunlock;
1665 }
1666 if (S_ISDIR(new_mode)) {
1667 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1668 if (error)
1669 goto out_gunlock;
1670 }
1671 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1672 if (error)
1673 goto out_gunlock;
1674
1675 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1676 if (error)
1677 goto out_end_trans;
1678
1679 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1680 if (error)
1681 goto out_end_trans;
1682
1683 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1684 IF2DT(old_mode));
1685 if (error)
1686 goto out_end_trans;
1687
1688 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1689 IF2DT(new_mode));
1690 if (error)
1691 goto out_end_trans;
1692
1693 if (odip != ndip) {
1694 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1695 inc_nlink(&odip->i_inode);
1696 drop_nlink(&ndip->i_inode);
1697 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1698 inc_nlink(&ndip->i_inode);
1699 drop_nlink(&odip->i_inode);
1700 }
1701 }
1702 mark_inode_dirty(&ndip->i_inode);
1703 if (odip != ndip)
1704 mark_inode_dirty(&odip->i_inode);
1705
1706out_end_trans:
1707 gfs2_trans_end(sdp);
1708out_gunlock:
1709 while (x--) {
1710 if (gfs2_holder_queued(ghs + x))
1711 gfs2_glock_dq(ghs + x);
1712 gfs2_holder_uninit(ghs + x);
1713 }
1714out_gunlock_r:
1715 if (gfs2_holder_initialized(&r_gh))
1716 gfs2_glock_dq_uninit(&r_gh);
1717out:
1718 return error;
1719}
1720
1721static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1722 struct inode *ndir, struct dentry *ndentry,
1723 unsigned int flags)
1724{
1725 flags &= ~RENAME_NOREPLACE;
1726
1727 if (flags & ~RENAME_EXCHANGE)
1728 return -EINVAL;
1729
1730 if (flags & RENAME_EXCHANGE)
1731 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1732
1733 return gfs2_rename(odir, odentry, ndir, ndentry);
1734}
1735
1736/**
1737 * gfs2_get_link - Follow a symbolic link
1738 * @dentry: The dentry of the link
1739 * @inode: The inode of the link
1740 * @done: destructor for return value
1741 *
1742 * This can handle symlinks of any size.
1743 *
1744 * Returns: 0 on success or error code
1745 */
1746
1747static const char *gfs2_get_link(struct dentry *dentry,
1748 struct inode *inode,
1749 struct delayed_call *done)
1750{
1751 struct gfs2_inode *ip = GFS2_I(inode);
1752 struct gfs2_holder i_gh;
1753 struct buffer_head *dibh;
1754 unsigned int size;
1755 char *buf;
1756 int error;
1757
1758 if (!dentry)
1759 return ERR_PTR(-ECHILD);
1760
1761 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1762 error = gfs2_glock_nq(&i_gh);
1763 if (error) {
1764 gfs2_holder_uninit(&i_gh);
1765 return ERR_PTR(error);
1766 }
1767
1768 size = (unsigned int)i_size_read(&ip->i_inode);
1769 if (size == 0) {
1770 gfs2_consist_inode(ip);
1771 buf = ERR_PTR(-EIO);
1772 goto out;
1773 }
1774
1775 error = gfs2_meta_inode_buffer(ip, &dibh);
1776 if (error) {
1777 buf = ERR_PTR(error);
1778 goto out;
1779 }
1780
1781 buf = kzalloc(size + 1, GFP_NOFS);
1782 if (!buf)
1783 buf = ERR_PTR(-ENOMEM);
1784 else
1785 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1786 brelse(dibh);
1787out:
1788 gfs2_glock_dq_uninit(&i_gh);
1789 if (!IS_ERR(buf))
1790 set_delayed_call(done, kfree_link, buf);
1791 return buf;
1792}
1793
1794/**
1795 * gfs2_permission -
1796 * @inode: The inode
1797 * @mask: The mask to be tested
1798 * @flags: Indicates whether this is an RCU path walk or not
1799 *
1800 * This may be called from the VFS directly, or from within GFS2 with the
1801 * inode locked, so we look to see if the glock is already locked and only
1802 * lock the glock if its not already been done.
1803 *
1804 * Returns: errno
1805 */
1806
1807int gfs2_permission(struct inode *inode, int mask)
1808{
1809 struct gfs2_inode *ip;
1810 struct gfs2_holder i_gh;
1811 int error;
1812
1813 gfs2_holder_mark_uninitialized(&i_gh);
1814 ip = GFS2_I(inode);
1815 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1816 if (mask & MAY_NOT_BLOCK)
1817 return -ECHILD;
1818 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1819 if (error)
1820 return error;
1821 }
1822
1823 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1824 error = -EPERM;
1825 else
1826 error = generic_permission(inode, mask);
1827 if (gfs2_holder_initialized(&i_gh))
1828 gfs2_glock_dq_uninit(&i_gh);
1829
1830 return error;
1831}
1832
1833static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1834{
1835 setattr_copy(inode, attr);
1836 mark_inode_dirty(inode);
1837 return 0;
1838}
1839
1840/**
1841 * gfs2_setattr_simple -
1842 * @ip:
1843 * @attr:
1844 *
1845 * Returns: errno
1846 */
1847
1848int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1849{
1850 int error;
1851
1852 if (current->journal_info)
1853 return __gfs2_setattr_simple(inode, attr);
1854
1855 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1856 if (error)
1857 return error;
1858
1859 error = __gfs2_setattr_simple(inode, attr);
1860 gfs2_trans_end(GFS2_SB(inode));
1861 return error;
1862}
1863
1864static int setattr_chown(struct inode *inode, struct iattr *attr)
1865{
1866 struct gfs2_inode *ip = GFS2_I(inode);
1867 struct gfs2_sbd *sdp = GFS2_SB(inode);
1868 kuid_t ouid, nuid;
1869 kgid_t ogid, ngid;
1870 int error;
1871 struct gfs2_alloc_parms ap;
1872
1873 ouid = inode->i_uid;
1874 ogid = inode->i_gid;
1875 nuid = attr->ia_uid;
1876 ngid = attr->ia_gid;
1877
1878 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1879 ouid = nuid = NO_UID_QUOTA_CHANGE;
1880 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1881 ogid = ngid = NO_GID_QUOTA_CHANGE;
1882
1883 error = gfs2_rsqa_alloc(ip);
1884 if (error)
1885 goto out;
1886
1887 error = gfs2_rindex_update(sdp);
1888 if (error)
1889 goto out;
1890
1891 error = gfs2_quota_lock(ip, nuid, ngid);
1892 if (error)
1893 goto out;
1894
1895 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1896
1897 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1898 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1899 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1900 if (error)
1901 goto out_gunlock_q;
1902 }
1903
1904 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1905 if (error)
1906 goto out_gunlock_q;
1907
1908 error = gfs2_setattr_simple(inode, attr);
1909 if (error)
1910 goto out_end_trans;
1911
1912 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1913 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1914 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1915 gfs2_quota_change(ip, ap.target, nuid, ngid);
1916 }
1917
1918out_end_trans:
1919 gfs2_trans_end(sdp);
1920out_gunlock_q:
1921 gfs2_quota_unlock(ip);
1922out:
1923 return error;
1924}
1925
1926/**
1927 * gfs2_setattr - Change attributes on an inode
1928 * @dentry: The dentry which is changing
1929 * @attr: The structure describing the change
1930 *
1931 * The VFS layer wants to change one or more of an inodes attributes. Write
1932 * that change out to disk.
1933 *
1934 * Returns: errno
1935 */
1936
1937static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1938{
1939 struct inode *inode = d_inode(dentry);
1940 struct gfs2_inode *ip = GFS2_I(inode);
1941 struct gfs2_holder i_gh;
1942 int error;
1943
1944 error = gfs2_rsqa_alloc(ip);
1945 if (error)
1946 return error;
1947
1948 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1949 if (error)
1950 return error;
1951
1952 error = -EPERM;
1953 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1954 goto out;
1955
1956 error = setattr_prepare(dentry, attr);
1957 if (error)
1958 goto out;
1959
1960 if (attr->ia_valid & ATTR_SIZE)
1961 error = gfs2_setattr_size(inode, attr->ia_size);
1962 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1963 error = setattr_chown(inode, attr);
1964 else {
1965 error = gfs2_setattr_simple(inode, attr);
1966 if (!error && attr->ia_valid & ATTR_MODE)
1967 error = posix_acl_chmod(inode, inode->i_mode);
1968 }
1969
1970out:
1971 if (!error)
1972 mark_inode_dirty(inode);
1973 gfs2_glock_dq_uninit(&i_gh);
1974 return error;
1975}
1976
1977/**
1978 * gfs2_getattr - Read out an inode's attributes
1979 * @path: Object to query
1980 * @stat: The inode's stats
1981 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1982 * @flags: AT_STATX_xxx setting
1983 *
1984 * This may be called from the VFS directly, or from within GFS2 with the
1985 * inode locked, so we look to see if the glock is already locked and only
1986 * lock the glock if its not already been done. Note that its the NFS
1987 * readdirplus operation which causes this to be called (from filldir)
1988 * with the glock already held.
1989 *
1990 * Returns: errno
1991 */
1992
1993static int gfs2_getattr(const struct path *path, struct kstat *stat,
1994 u32 request_mask, unsigned int flags)
1995{
1996 struct inode *inode = d_inode(path->dentry);
1997 struct gfs2_inode *ip = GFS2_I(inode);
1998 struct gfs2_holder gh;
1999 u32 gfsflags;
2000 int error;
2001
2002 gfs2_holder_mark_uninitialized(&gh);
2003 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2004 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2005 if (error)
2006 return error;
2007 }
2008
2009 gfsflags = ip->i_diskflags;
2010 if (gfsflags & GFS2_DIF_APPENDONLY)
2011 stat->attributes |= STATX_ATTR_APPEND;
2012 if (gfsflags & GFS2_DIF_IMMUTABLE)
2013 stat->attributes |= STATX_ATTR_IMMUTABLE;
2014
2015 stat->attributes_mask |= (STATX_ATTR_APPEND |
2016 STATX_ATTR_COMPRESSED |
2017 STATX_ATTR_ENCRYPTED |
2018 STATX_ATTR_IMMUTABLE |
2019 STATX_ATTR_NODUMP);
2020
2021 generic_fillattr(inode, stat);
2022
2023 if (gfs2_holder_initialized(&gh))
2024 gfs2_glock_dq_uninit(&gh);
2025
2026 return 0;
2027}
2028
2029static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2030 u64 start, u64 len)
2031{
2032 struct gfs2_inode *ip = GFS2_I(inode);
2033 struct gfs2_holder gh;
2034 int ret;
2035
2036 inode_lock_shared(inode);
2037
2038 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2039 if (ret)
2040 goto out;
2041
2042 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2043
2044 gfs2_glock_dq_uninit(&gh);
2045
2046out:
2047 inode_unlock_shared(inode);
2048 return ret;
2049}
2050
2051loff_t gfs2_seek_data(struct file *file, loff_t offset)
2052{
2053 struct inode *inode = file->f_mapping->host;
2054 struct gfs2_inode *ip = GFS2_I(inode);
2055 struct gfs2_holder gh;
2056 loff_t ret;
2057
2058 inode_lock_shared(inode);
2059 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2060 if (!ret)
2061 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2062 gfs2_glock_dq_uninit(&gh);
2063 inode_unlock_shared(inode);
2064
2065 if (ret < 0)
2066 return ret;
2067 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2068}
2069
2070loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2071{
2072 struct inode *inode = file->f_mapping->host;
2073 struct gfs2_inode *ip = GFS2_I(inode);
2074 struct gfs2_holder gh;
2075 loff_t ret;
2076
2077 inode_lock_shared(inode);
2078 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2079 if (!ret)
2080 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2081 gfs2_glock_dq_uninit(&gh);
2082 inode_unlock_shared(inode);
2083
2084 if (ret < 0)
2085 return ret;
2086 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2087}
2088
2089const struct inode_operations gfs2_file_iops = {
2090 .permission = gfs2_permission,
2091 .setattr = gfs2_setattr,
2092 .getattr = gfs2_getattr,
2093 .listxattr = gfs2_listxattr,
2094 .fiemap = gfs2_fiemap,
2095 .get_acl = gfs2_get_acl,
2096 .set_acl = gfs2_set_acl,
2097};
2098
2099const struct inode_operations gfs2_dir_iops = {
2100 .create = gfs2_create,
2101 .lookup = gfs2_lookup,
2102 .link = gfs2_link,
2103 .unlink = gfs2_unlink,
2104 .symlink = gfs2_symlink,
2105 .mkdir = gfs2_mkdir,
2106 .rmdir = gfs2_unlink,
2107 .mknod = gfs2_mknod,
2108 .rename = gfs2_rename2,
2109 .permission = gfs2_permission,
2110 .setattr = gfs2_setattr,
2111 .getattr = gfs2_getattr,
2112 .listxattr = gfs2_listxattr,
2113 .fiemap = gfs2_fiemap,
2114 .get_acl = gfs2_get_acl,
2115 .set_acl = gfs2_set_acl,
2116 .atomic_open = gfs2_atomic_open,
2117};
2118
2119const struct inode_operations gfs2_symlink_iops = {
2120 .get_link = gfs2_get_link,
2121 .permission = gfs2_permission,
2122 .setattr = gfs2_setattr,
2123 .getattr = gfs2_getattr,
2124 .listxattr = gfs2_listxattr,
2125 .fiemap = gfs2_fiemap,
2126};
2127