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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/fiemap.h>
21#include <linux/uaccess.h>
22
23#include "gfs2.h"
24#include "incore.h"
25#include "acl.h"
26#include "bmap.h"
27#include "dir.h"
28#include "xattr.h"
29#include "glock.h"
30#include "inode.h"
31#include "meta_io.h"
32#include "quota.h"
33#include "rgrp.h"
34#include "trans.h"
35#include "util.h"
36#include "super.h"
37#include "glops.h"
38
39static const struct inode_operations gfs2_file_iops;
40static const struct inode_operations gfs2_dir_iops;
41static const struct inode_operations gfs2_symlink_iops;
42
43/**
44 * gfs2_set_iop - Sets inode operations
45 * @inode: The inode with correct i_mode filled in
46 *
47 * GFS2 lookup code fills in vfs inode contents based on info obtained
48 * from directory entry inside gfs2_inode_lookup().
49 */
50
51static void gfs2_set_iop(struct inode *inode)
52{
53 struct gfs2_sbd *sdp = GFS2_SB(inode);
54 umode_t mode = inode->i_mode;
55
56 if (S_ISREG(mode)) {
57 inode->i_op = &gfs2_file_iops;
58 if (gfs2_localflocks(sdp))
59 inode->i_fop = &gfs2_file_fops_nolock;
60 else
61 inode->i_fop = &gfs2_file_fops;
62 } else if (S_ISDIR(mode)) {
63 inode->i_op = &gfs2_dir_iops;
64 if (gfs2_localflocks(sdp))
65 inode->i_fop = &gfs2_dir_fops_nolock;
66 else
67 inode->i_fop = &gfs2_dir_fops;
68 } else if (S_ISLNK(mode)) {
69 inode->i_op = &gfs2_symlink_iops;
70 } else {
71 inode->i_op = &gfs2_file_iops;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
73 }
74}
75
76static int iget_test(struct inode *inode, void *opaque)
77{
78 u64 no_addr = *(u64 *)opaque;
79
80 return GFS2_I(inode)->i_no_addr == no_addr;
81}
82
83static int iget_set(struct inode *inode, void *opaque)
84{
85 u64 no_addr = *(u64 *)opaque;
86
87 GFS2_I(inode)->i_no_addr = no_addr;
88 inode->i_ino = no_addr;
89 return 0;
90}
91
92/**
93 * gfs2_inode_lookup - Lookup an inode
94 * @sb: The super block
95 * @type: The type of the inode
96 * @no_addr: The inode number
97 * @no_formal_ino: The inode generation number
98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99 * GFS2_BLKST_FREE to indicate not to verify)
100 *
101 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
102 *
103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104 * placeholder because it doesn't otherwise make sense), the on-disk block type
105 * is verified to be @blktype.
106 *
107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108 * if it detects that @no_formal_ino doesn't match the actual inode generation
109 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
110 *
111 * Returns: A VFS inode, or an error
112 */
113
114struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115 u64 no_addr, u64 no_formal_ino,
116 unsigned int blktype)
117{
118 struct inode *inode;
119 struct gfs2_inode *ip;
120 struct gfs2_holder i_gh;
121 int error;
122
123 gfs2_holder_mark_uninitialized(&i_gh);
124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
125 if (!inode)
126 return ERR_PTR(-ENOMEM);
127
128 ip = GFS2_I(inode);
129
130 if (inode->i_state & I_NEW) {
131 struct gfs2_sbd *sdp = GFS2_SB(inode);
132 struct gfs2_glock *io_gl;
133 int extra_flags = 0;
134
135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
136 &ip->i_gl);
137 if (unlikely(error))
138 goto fail;
139
140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
141 &io_gl);
142 if (unlikely(error))
143 goto fail;
144
145 /*
146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147 * delete_work_func(). Make sure not to cancel the delete work
148 * from within itself here.
149 */
150 if (blktype == GFS2_BLKST_UNLINKED)
151 extra_flags |= LM_FLAG_TRY;
152 else
153 gfs2_cancel_delete_work(io_gl);
154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
155 GL_EXACT | GL_NOPID | extra_flags,
156 &ip->i_iopen_gh);
157 gfs2_glock_put(io_gl);
158 if (unlikely(error))
159 goto fail;
160
161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
162 /*
163 * The GL_SKIP flag indicates to skip reading the inode
164 * block. We read the inode when instantiating it
165 * after possibly checking the block type.
166 */
167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
168 GL_SKIP, &i_gh);
169 if (error)
170 goto fail;
171
172 error = -ESTALE;
173 if (no_formal_ino &&
174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
175 goto fail;
176
177 if (blktype != GFS2_BLKST_FREE) {
178 error = gfs2_check_blk_type(sdp, no_addr,
179 blktype);
180 if (error)
181 goto fail;
182 }
183 }
184
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
186
187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188 inode_set_atime(inode,
189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
190 0);
191
192 glock_set_object(ip->i_gl, ip);
193
194 if (type == DT_UNKNOWN) {
195 /* Inode glock must be locked already */
196 error = gfs2_instantiate(&i_gh);
197 if (error) {
198 glock_clear_object(ip->i_gl, ip);
199 goto fail;
200 }
201 } else {
202 ip->i_no_formal_ino = no_formal_ino;
203 inode->i_mode = DT2IF(type);
204 }
205
206 if (gfs2_holder_initialized(&i_gh))
207 gfs2_glock_dq_uninit(&i_gh);
208 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
209
210 gfs2_set_iop(inode);
211 unlock_new_inode(inode);
212 }
213
214 if (no_formal_ino && ip->i_no_formal_ino &&
215 no_formal_ino != ip->i_no_formal_ino) {
216 iput(inode);
217 return ERR_PTR(-ESTALE);
218 }
219
220 return inode;
221
222fail:
223 if (error == GLR_TRYFAILED)
224 error = -EAGAIN;
225 if (gfs2_holder_initialized(&ip->i_iopen_gh))
226 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
227 if (gfs2_holder_initialized(&i_gh))
228 gfs2_glock_dq_uninit(&i_gh);
229 if (ip->i_gl) {
230 gfs2_glock_put(ip->i_gl);
231 ip->i_gl = NULL;
232 }
233 iget_failed(inode);
234 return ERR_PTR(error);
235}
236
237/**
238 * gfs2_lookup_by_inum - look up an inode by inode number
239 * @sdp: The super block
240 * @no_addr: The inode number
241 * @no_formal_ino: The inode generation number (0 for any)
242 * @blktype: Requested block type (see gfs2_inode_lookup)
243 */
244struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
245 u64 no_formal_ino, unsigned int blktype)
246{
247 struct super_block *sb = sdp->sd_vfs;
248 struct inode *inode;
249 int error;
250
251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
252 blktype);
253 if (IS_ERR(inode))
254 return inode;
255
256 if (no_formal_ino) {
257 error = -EIO;
258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
259 goto fail_iput;
260 }
261 return inode;
262
263fail_iput:
264 iput(inode);
265 return ERR_PTR(error);
266}
267
268
269/**
270 * gfs2_lookup_meta - Look up an inode in a metadata directory
271 * @dip: The directory
272 * @name: The name of the inode
273 */
274struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
275{
276 struct qstr qstr;
277 struct inode *inode;
278
279 gfs2_str2qstr(&qstr, name);
280 inode = gfs2_lookupi(dip, &qstr, 1);
281 if (IS_ERR_OR_NULL(inode))
282 return inode ? inode : ERR_PTR(-ENOENT);
283
284 /*
285 * Must not call back into the filesystem when allocating
286 * pages in the metadata inode's address space.
287 */
288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
289
290 return inode;
291}
292
293
294/**
295 * gfs2_lookupi - Look up a filename in a directory and return its inode
296 * @dir: The inode of the directory containing the inode to look-up
297 * @name: The name of the inode to look for
298 * @is_root: If 1, ignore the caller's permissions
299 *
300 * This can be called via the VFS filldir function when NFS is doing
301 * a readdirplus and the inode which its intending to stat isn't
302 * already in cache. In this case we must not take the directory glock
303 * again, since the readdir call will have already taken that lock.
304 *
305 * Returns: errno
306 */
307
308struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
309 int is_root)
310{
311 struct super_block *sb = dir->i_sb;
312 struct gfs2_inode *dip = GFS2_I(dir);
313 struct gfs2_holder d_gh;
314 int error = 0;
315 struct inode *inode = NULL;
316
317 gfs2_holder_mark_uninitialized(&d_gh);
318 if (!name->len || name->len > GFS2_FNAMESIZE)
319 return ERR_PTR(-ENAMETOOLONG);
320
321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
323 dir == d_inode(sb->s_root))) {
324 igrab(dir);
325 return dir;
326 }
327
328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
330 if (error)
331 return ERR_PTR(error);
332 }
333
334 if (!is_root) {
335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
336 if (error)
337 goto out;
338 }
339
340 inode = gfs2_dir_search(dir, name, false);
341 if (IS_ERR(inode))
342 error = PTR_ERR(inode);
343out:
344 if (gfs2_holder_initialized(&d_gh))
345 gfs2_glock_dq_uninit(&d_gh);
346 if (error == -ENOENT)
347 return NULL;
348 return inode ? inode : ERR_PTR(error);
349}
350
351/**
352 * create_ok - OK to create a new on-disk inode here?
353 * @dip: Directory in which dinode is to be created
354 * @name: Name of new dinode
355 * @mode:
356 *
357 * Returns: errno
358 */
359
360static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
361 umode_t mode)
362{
363 int error;
364
365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
366 MAY_WRITE | MAY_EXEC);
367 if (error)
368 return error;
369
370 /* Don't create entries in an unlinked directory */
371 if (!dip->i_inode.i_nlink)
372 return -ENOENT;
373
374 if (dip->i_entries == (u32)-1)
375 return -EFBIG;
376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
377 return -EMLINK;
378
379 return 0;
380}
381
382static void munge_mode_uid_gid(const struct gfs2_inode *dip,
383 struct inode *inode)
384{
385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
386 (dip->i_inode.i_mode & S_ISUID) &&
387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
388 if (S_ISDIR(inode->i_mode))
389 inode->i_mode |= S_ISUID;
390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
391 inode->i_mode &= ~07111;
392 inode->i_uid = dip->i_inode.i_uid;
393 } else
394 inode->i_uid = current_fsuid();
395
396 if (dip->i_inode.i_mode & S_ISGID) {
397 if (S_ISDIR(inode->i_mode))
398 inode->i_mode |= S_ISGID;
399 inode->i_gid = dip->i_inode.i_gid;
400 } else
401 inode->i_gid = current_fsgid();
402}
403
404static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
405{
406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
408 int error;
409
410 error = gfs2_quota_lock_check(ip, &ap);
411 if (error)
412 goto out;
413
414 error = gfs2_inplace_reserve(ip, &ap);
415 if (error)
416 goto out_quota;
417
418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
419 if (error)
420 goto out_ipreserv;
421
422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1);
423 if (error)
424 goto out_trans_end;
425
426 ip->i_no_formal_ino = ip->i_generation;
427 ip->i_inode.i_ino = ip->i_no_addr;
428 ip->i_goal = ip->i_no_addr;
429 if (*dblocks > 1)
430 ip->i_eattr = ip->i_no_addr + 1;
431
432out_trans_end:
433 gfs2_trans_end(sdp);
434out_ipreserv:
435 gfs2_inplace_release(ip);
436out_quota:
437 gfs2_quota_unlock(ip);
438out:
439 return error;
440}
441
442static void gfs2_init_dir(struct buffer_head *dibh,
443 const struct gfs2_inode *parent)
444{
445 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
446 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
447
448 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
449 dent->de_inum = di->di_num; /* already GFS2 endian */
450 dent->de_type = cpu_to_be16(DT_DIR);
451
452 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
453 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
454 gfs2_inum_out(parent, dent);
455 dent->de_type = cpu_to_be16(DT_DIR);
456
457}
458
459/**
460 * gfs2_init_xattr - Initialise an xattr block for a new inode
461 * @ip: The inode in question
462 *
463 * This sets up an empty xattr block for a new inode, ready to
464 * take any ACLs, LSM xattrs, etc.
465 */
466
467static void gfs2_init_xattr(struct gfs2_inode *ip)
468{
469 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
470 struct buffer_head *bh;
471 struct gfs2_ea_header *ea;
472
473 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
474 gfs2_trans_add_meta(ip->i_gl, bh);
475 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
476 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
477
478 ea = GFS2_EA_BH2FIRST(bh);
479 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
480 ea->ea_type = GFS2_EATYPE_UNUSED;
481 ea->ea_flags = GFS2_EAFLAG_LAST;
482
483 brelse(bh);
484}
485
486/**
487 * init_dinode - Fill in a new dinode structure
488 * @dip: The directory this inode is being created in
489 * @ip: The inode
490 * @symname: The symlink destination (if a symlink)
491 *
492 */
493
494static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
495 const char *symname)
496{
497 struct gfs2_dinode *di;
498 struct buffer_head *dibh;
499
500 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
501 gfs2_trans_add_meta(ip->i_gl, dibh);
502 di = (struct gfs2_dinode *)dibh->b_data;
503 gfs2_dinode_out(ip, di);
504
505 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
506 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
507 di->__pad1 = 0;
508 di->__pad2 = 0;
509 di->__pad3 = 0;
510 memset(&di->__pad4, 0, sizeof(di->__pad4));
511 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
512 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
513
514 switch(ip->i_inode.i_mode & S_IFMT) {
515 case S_IFDIR:
516 gfs2_init_dir(dibh, dip);
517 break;
518 case S_IFLNK:
519 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
520 break;
521 }
522
523 set_buffer_uptodate(dibh);
524 brelse(dibh);
525}
526
527/**
528 * gfs2_trans_da_blks - Calculate number of blocks to link inode
529 * @dip: The directory we are linking into
530 * @da: The dir add information
531 * @nr_inodes: The number of inodes involved
532 *
533 * This calculate the number of blocks we need to reserve in a
534 * transaction to link @nr_inodes into a directory. In most cases
535 * @nr_inodes will be 2 (the directory plus the inode being linked in)
536 * but in case of rename, 4 may be required.
537 *
538 * Returns: Number of blocks
539 */
540
541static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
542 const struct gfs2_diradd *da,
543 unsigned nr_inodes)
544{
545 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
546 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
547}
548
549static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550 struct gfs2_inode *ip, struct gfs2_diradd *da)
551{
552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
553 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
554 int error;
555
556 if (da->nr_blocks) {
557 error = gfs2_quota_lock_check(dip, &ap);
558 if (error)
559 goto fail_quota_locks;
560
561 error = gfs2_inplace_reserve(dip, &ap);
562 if (error)
563 goto fail_quota_locks;
564
565 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
566 if (error)
567 goto fail_ipreserv;
568 } else {
569 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
570 if (error)
571 goto fail_quota_locks;
572 }
573
574 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
575
576 gfs2_trans_end(sdp);
577fail_ipreserv:
578 gfs2_inplace_release(dip);
579fail_quota_locks:
580 gfs2_quota_unlock(dip);
581 return error;
582}
583
584static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
585 void *fs_info)
586{
587 const struct xattr *xattr;
588 int err = 0;
589
590 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
591 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
592 xattr->value_len, 0,
593 GFS2_EATYPE_SECURITY);
594 if (err < 0)
595 break;
596 }
597 return err;
598}
599
600/**
601 * gfs2_create_inode - Create a new inode
602 * @dir: The parent directory
603 * @dentry: The new dentry
604 * @file: If non-NULL, the file which is being opened
605 * @mode: The permissions on the new inode
606 * @dev: For device nodes, this is the device number
607 * @symname: For symlinks, this is the link destination
608 * @size: The initial size of the inode (ignored for directories)
609 * @excl: Force fail if inode exists
610 *
611 * FIXME: Change to allocate the disk blocks and write them out in the same
612 * transaction. That way, we can no longer end up in a situation in which an
613 * inode is allocated, the node crashes, and the block looks like a valid
614 * inode. (With atomic creates in place, we will also no longer need to zero
615 * the link count and dirty the inode here on failure.)
616 *
617 * Returns: 0 on success, or error code
618 */
619
620static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
621 struct file *file,
622 umode_t mode, dev_t dev, const char *symname,
623 unsigned int size, int excl)
624{
625 const struct qstr *name = &dentry->d_name;
626 struct posix_acl *default_acl, *acl;
627 struct gfs2_holder d_gh, gh;
628 struct inode *inode = NULL;
629 struct gfs2_inode *dip = GFS2_I(dir), *ip;
630 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
631 struct gfs2_glock *io_gl;
632 int error;
633 u32 aflags = 0;
634 unsigned blocks = 1;
635 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
636
637 if (!name->len || name->len > GFS2_FNAMESIZE)
638 return -ENAMETOOLONG;
639
640 error = gfs2_qa_get(dip);
641 if (error)
642 return error;
643
644 error = gfs2_rindex_update(sdp);
645 if (error)
646 goto fail;
647
648 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
649 if (error)
650 goto fail;
651 gfs2_holder_mark_uninitialized(&gh);
652
653 error = create_ok(dip, name, mode);
654 if (error)
655 goto fail_gunlock;
656
657 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
658 error = PTR_ERR(inode);
659 if (!IS_ERR(inode)) {
660 if (S_ISDIR(inode->i_mode)) {
661 iput(inode);
662 inode = ERR_PTR(-EISDIR);
663 goto fail_gunlock;
664 }
665 d_instantiate(dentry, inode);
666 error = 0;
667 if (file) {
668 if (S_ISREG(inode->i_mode))
669 error = finish_open(file, dentry, gfs2_open_common);
670 else
671 error = finish_no_open(file, NULL);
672 }
673 gfs2_glock_dq_uninit(&d_gh);
674 goto fail;
675 } else if (error != -ENOENT) {
676 goto fail_gunlock;
677 }
678
679 error = gfs2_diradd_alloc_required(dir, name, &da);
680 if (error < 0)
681 goto fail_gunlock;
682
683 inode = new_inode(sdp->sd_vfs);
684 error = -ENOMEM;
685 if (!inode)
686 goto fail_gunlock;
687 ip = GFS2_I(inode);
688
689 error = posix_acl_create(dir, &mode, &default_acl, &acl);
690 if (error)
691 goto fail_gunlock;
692
693 error = gfs2_qa_get(ip);
694 if (error)
695 goto fail_free_acls;
696
697 inode->i_mode = mode;
698 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
699 inode->i_rdev = dev;
700 inode->i_size = size;
701 simple_inode_init_ts(inode);
702 munge_mode_uid_gid(dip, inode);
703 check_and_update_goal(dip);
704 ip->i_goal = dip->i_goal;
705 ip->i_diskflags = 0;
706 ip->i_eattr = 0;
707 ip->i_height = 0;
708 ip->i_depth = 0;
709 ip->i_entries = 0;
710 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
711
712 switch(mode & S_IFMT) {
713 case S_IFREG:
714 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
715 gfs2_tune_get(sdp, gt_new_files_jdata))
716 ip->i_diskflags |= GFS2_DIF_JDATA;
717 gfs2_set_aops(inode);
718 break;
719 case S_IFDIR:
720 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
721 ip->i_diskflags |= GFS2_DIF_JDATA;
722 ip->i_entries = 2;
723 break;
724 }
725
726 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
727 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
728 ip->i_diskflags |= GFS2_DIF_SYSTEM;
729
730 gfs2_set_inode_flags(inode);
731
732 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
733 (dip->i_diskflags & GFS2_DIF_TOPDIR))
734 aflags |= GFS2_AF_ORLOV;
735
736 if (default_acl || acl)
737 blocks++;
738
739 error = alloc_dinode(ip, aflags, &blocks);
740 if (error)
741 goto fail_free_inode;
742
743 gfs2_set_inode_blocks(inode, blocks);
744
745 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
746 if (error)
747 goto fail_free_inode;
748
749 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
750 if (error)
751 goto fail_free_inode;
752 gfs2_cancel_delete_work(io_gl);
753
754retry:
755 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
756 if (error == -EBUSY)
757 goto retry;
758 if (error)
759 goto fail_gunlock2;
760
761 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
762 &ip->i_iopen_gh);
763 if (error)
764 goto fail_gunlock2;
765
766 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
767 if (error)
768 goto fail_gunlock3;
769
770 error = gfs2_trans_begin(sdp, blocks, 0);
771 if (error)
772 goto fail_gunlock3;
773
774 if (blocks > 1)
775 gfs2_init_xattr(ip);
776 init_dinode(dip, ip, symname);
777 gfs2_trans_end(sdp);
778
779 glock_set_object(ip->i_gl, ip);
780 glock_set_object(io_gl, ip);
781 gfs2_set_iop(inode);
782
783 if (default_acl) {
784 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
785 if (error)
786 goto fail_gunlock4;
787 posix_acl_release(default_acl);
788 default_acl = NULL;
789 }
790 if (acl) {
791 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
792 if (error)
793 goto fail_gunlock4;
794 posix_acl_release(acl);
795 acl = NULL;
796 }
797
798 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
799 &gfs2_initxattrs, NULL);
800 if (error)
801 goto fail_gunlock4;
802
803 error = link_dinode(dip, name, ip, &da);
804 if (error)
805 goto fail_gunlock4;
806
807 mark_inode_dirty(inode);
808 d_instantiate(dentry, inode);
809 /* After instantiate, errors should result in evict which will destroy
810 * both inode and iopen glocks properly. */
811 if (file) {
812 file->f_mode |= FMODE_CREATED;
813 error = finish_open(file, dentry, gfs2_open_common);
814 }
815 gfs2_glock_dq_uninit(&d_gh);
816 gfs2_qa_put(ip);
817 gfs2_glock_dq_uninit(&gh);
818 gfs2_glock_put(io_gl);
819 gfs2_qa_put(dip);
820 unlock_new_inode(inode);
821 return error;
822
823fail_gunlock4:
824 glock_clear_object(ip->i_gl, ip);
825 glock_clear_object(io_gl, ip);
826fail_gunlock3:
827 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
828fail_gunlock2:
829 gfs2_glock_put(io_gl);
830fail_free_inode:
831 if (ip->i_gl) {
832 gfs2_glock_put(ip->i_gl);
833 ip->i_gl = NULL;
834 }
835 gfs2_rs_deltree(&ip->i_res);
836 gfs2_qa_put(ip);
837fail_free_acls:
838 posix_acl_release(default_acl);
839 posix_acl_release(acl);
840fail_gunlock:
841 gfs2_dir_no_add(&da);
842 gfs2_glock_dq_uninit(&d_gh);
843 if (!IS_ERR_OR_NULL(inode)) {
844 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
845 clear_nlink(inode);
846 if (ip->i_no_addr)
847 mark_inode_dirty(inode);
848 if (inode->i_state & I_NEW)
849 iget_failed(inode);
850 else
851 iput(inode);
852 }
853 if (gfs2_holder_initialized(&gh))
854 gfs2_glock_dq_uninit(&gh);
855fail:
856 gfs2_qa_put(dip);
857 return error;
858}
859
860/**
861 * gfs2_create - Create a file
862 * @idmap: idmap of the mount the inode was found from
863 * @dir: The directory in which to create the file
864 * @dentry: The dentry of the new file
865 * @mode: The mode of the new file
866 * @excl: Force fail if inode exists
867 *
868 * Returns: errno
869 */
870
871static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
872 struct dentry *dentry, umode_t mode, bool excl)
873{
874 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
875}
876
877/**
878 * __gfs2_lookup - Look up a filename in a directory and return its inode
879 * @dir: The directory inode
880 * @dentry: The dentry of the new inode
881 * @file: File to be opened
882 *
883 *
884 * Returns: errno
885 */
886
887static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
888 struct file *file)
889{
890 struct inode *inode;
891 struct dentry *d;
892 struct gfs2_holder gh;
893 struct gfs2_glock *gl;
894 int error;
895
896 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
897 if (inode == NULL) {
898 d_add(dentry, NULL);
899 return NULL;
900 }
901 if (IS_ERR(inode))
902 return ERR_CAST(inode);
903
904 gl = GFS2_I(inode)->i_gl;
905 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
906 if (error) {
907 iput(inode);
908 return ERR_PTR(error);
909 }
910
911 d = d_splice_alias(inode, dentry);
912 if (IS_ERR(d)) {
913 gfs2_glock_dq_uninit(&gh);
914 return d;
915 }
916 if (file && S_ISREG(inode->i_mode))
917 error = finish_open(file, dentry, gfs2_open_common);
918
919 gfs2_glock_dq_uninit(&gh);
920 if (error) {
921 dput(d);
922 return ERR_PTR(error);
923 }
924 return d;
925}
926
927static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
928 unsigned flags)
929{
930 return __gfs2_lookup(dir, dentry, NULL);
931}
932
933/**
934 * gfs2_link - Link to a file
935 * @old_dentry: The inode to link
936 * @dir: Add link to this directory
937 * @dentry: The name of the link
938 *
939 * Link the inode in "old_dentry" into the directory "dir" with the
940 * name in "dentry".
941 *
942 * Returns: errno
943 */
944
945static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
946 struct dentry *dentry)
947{
948 struct gfs2_inode *dip = GFS2_I(dir);
949 struct gfs2_sbd *sdp = GFS2_SB(dir);
950 struct inode *inode = d_inode(old_dentry);
951 struct gfs2_inode *ip = GFS2_I(inode);
952 struct gfs2_holder d_gh, gh;
953 struct buffer_head *dibh;
954 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
955 int error;
956
957 if (S_ISDIR(inode->i_mode))
958 return -EPERM;
959
960 error = gfs2_qa_get(dip);
961 if (error)
962 return error;
963
964 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
965 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
966
967 error = gfs2_glock_nq(&d_gh);
968 if (error)
969 goto out_parent;
970
971 error = gfs2_glock_nq(&gh);
972 if (error)
973 goto out_child;
974
975 error = -ENOENT;
976 if (inode->i_nlink == 0)
977 goto out_gunlock;
978
979 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
980 if (error)
981 goto out_gunlock;
982
983 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
984 switch (error) {
985 case -ENOENT:
986 break;
987 case 0:
988 error = -EEXIST;
989 goto out_gunlock;
990 default:
991 goto out_gunlock;
992 }
993
994 error = -EINVAL;
995 if (!dip->i_inode.i_nlink)
996 goto out_gunlock;
997 error = -EFBIG;
998 if (dip->i_entries == (u32)-1)
999 goto out_gunlock;
1000 error = -EPERM;
1001 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1002 goto out_gunlock;
1003 error = -EMLINK;
1004 if (ip->i_inode.i_nlink == (u32)-1)
1005 goto out_gunlock;
1006
1007 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1008 if (error < 0)
1009 goto out_gunlock;
1010
1011 if (da.nr_blocks) {
1012 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1013 error = gfs2_quota_lock_check(dip, &ap);
1014 if (error)
1015 goto out_gunlock;
1016
1017 error = gfs2_inplace_reserve(dip, &ap);
1018 if (error)
1019 goto out_gunlock_q;
1020
1021 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1022 if (error)
1023 goto out_ipres;
1024 } else {
1025 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1026 if (error)
1027 goto out_ipres;
1028 }
1029
1030 error = gfs2_meta_inode_buffer(ip, &dibh);
1031 if (error)
1032 goto out_end_trans;
1033
1034 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1035 if (error)
1036 goto out_brelse;
1037
1038 gfs2_trans_add_meta(ip->i_gl, dibh);
1039 inc_nlink(&ip->i_inode);
1040 inode_set_ctime_current(&ip->i_inode);
1041 ihold(inode);
1042 d_instantiate(dentry, inode);
1043 mark_inode_dirty(inode);
1044
1045out_brelse:
1046 brelse(dibh);
1047out_end_trans:
1048 gfs2_trans_end(sdp);
1049out_ipres:
1050 if (da.nr_blocks)
1051 gfs2_inplace_release(dip);
1052out_gunlock_q:
1053 if (da.nr_blocks)
1054 gfs2_quota_unlock(dip);
1055out_gunlock:
1056 gfs2_dir_no_add(&da);
1057 gfs2_glock_dq(&gh);
1058out_child:
1059 gfs2_glock_dq(&d_gh);
1060out_parent:
1061 gfs2_qa_put(dip);
1062 gfs2_holder_uninit(&d_gh);
1063 gfs2_holder_uninit(&gh);
1064 return error;
1065}
1066
1067/*
1068 * gfs2_unlink_ok - check to see that a inode is still in a directory
1069 * @dip: the directory
1070 * @name: the name of the file
1071 * @ip: the inode
1072 *
1073 * Assumes that the lock on (at least) @dip is held.
1074 *
1075 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1076 */
1077
1078static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1079 const struct gfs2_inode *ip)
1080{
1081 int error;
1082
1083 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1084 return -EPERM;
1085
1086 if ((dip->i_inode.i_mode & S_ISVTX) &&
1087 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1088 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1089 return -EPERM;
1090
1091 if (IS_APPEND(&dip->i_inode))
1092 return -EPERM;
1093
1094 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1095 MAY_WRITE | MAY_EXEC);
1096 if (error)
1097 return error;
1098
1099 return gfs2_dir_check(&dip->i_inode, name, ip);
1100}
1101
1102/**
1103 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1104 * @dip: The parent directory
1105 * @dentry: The dentry to unlink
1106 *
1107 * Called with all the locks and in a transaction. This will only be
1108 * called for a directory after it has been checked to ensure it is empty.
1109 *
1110 * Returns: 0 on success, or an error
1111 */
1112
1113static int gfs2_unlink_inode(struct gfs2_inode *dip,
1114 const struct dentry *dentry)
1115{
1116 struct inode *inode = d_inode(dentry);
1117 struct gfs2_inode *ip = GFS2_I(inode);
1118 int error;
1119
1120 error = gfs2_dir_del(dip, dentry);
1121 if (error)
1122 return error;
1123
1124 ip->i_entries = 0;
1125 inode_set_ctime_current(inode);
1126 if (S_ISDIR(inode->i_mode))
1127 clear_nlink(inode);
1128 else
1129 drop_nlink(inode);
1130 mark_inode_dirty(inode);
1131 if (inode->i_nlink == 0)
1132 gfs2_unlink_di(inode);
1133 return 0;
1134}
1135
1136
1137/**
1138 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1139 * @dir: The inode of the directory containing the inode to unlink
1140 * @dentry: The file itself
1141 *
1142 * This routine uses the type of the inode as a flag to figure out
1143 * whether this is an unlink or an rmdir.
1144 *
1145 * Returns: errno
1146 */
1147
1148static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1149{
1150 struct gfs2_inode *dip = GFS2_I(dir);
1151 struct gfs2_sbd *sdp = GFS2_SB(dir);
1152 struct inode *inode = d_inode(dentry);
1153 struct gfs2_inode *ip = GFS2_I(inode);
1154 struct gfs2_holder d_gh, r_gh, gh;
1155 struct gfs2_rgrpd *rgd;
1156 int error;
1157
1158 error = gfs2_rindex_update(sdp);
1159 if (error)
1160 return error;
1161
1162 error = -EROFS;
1163
1164 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1165 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1166
1167 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1168 if (!rgd)
1169 goto out_inodes;
1170
1171 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1172
1173
1174 error = gfs2_glock_nq(&d_gh);
1175 if (error)
1176 goto out_parent;
1177
1178 error = gfs2_glock_nq(&gh);
1179 if (error)
1180 goto out_child;
1181
1182 error = -ENOENT;
1183 if (inode->i_nlink == 0)
1184 goto out_rgrp;
1185
1186 if (S_ISDIR(inode->i_mode)) {
1187 error = -ENOTEMPTY;
1188 if (ip->i_entries > 2 || inode->i_nlink > 2)
1189 goto out_rgrp;
1190 }
1191
1192 error = gfs2_glock_nq(&r_gh); /* rgrp */
1193 if (error)
1194 goto out_rgrp;
1195
1196 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1197 if (error)
1198 goto out_gunlock;
1199
1200 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1201 if (error)
1202 goto out_gunlock;
1203
1204 error = gfs2_unlink_inode(dip, dentry);
1205 gfs2_trans_end(sdp);
1206
1207out_gunlock:
1208 gfs2_glock_dq(&r_gh);
1209out_rgrp:
1210 gfs2_glock_dq(&gh);
1211out_child:
1212 gfs2_glock_dq(&d_gh);
1213out_parent:
1214 gfs2_holder_uninit(&r_gh);
1215out_inodes:
1216 gfs2_holder_uninit(&gh);
1217 gfs2_holder_uninit(&d_gh);
1218 return error;
1219}
1220
1221/**
1222 * gfs2_symlink - Create a symlink
1223 * @idmap: idmap of the mount the inode was found from
1224 * @dir: The directory to create the symlink in
1225 * @dentry: The dentry to put the symlink in
1226 * @symname: The thing which the link points to
1227 *
1228 * Returns: errno
1229 */
1230
1231static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1232 struct dentry *dentry, const char *symname)
1233{
1234 unsigned int size;
1235
1236 size = strlen(symname);
1237 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1238 return -ENAMETOOLONG;
1239
1240 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1241}
1242
1243/**
1244 * gfs2_mkdir - Make a directory
1245 * @idmap: idmap of the mount the inode was found from
1246 * @dir: The parent directory of the new one
1247 * @dentry: The dentry of the new directory
1248 * @mode: The mode of the new directory
1249 *
1250 * Returns: errno
1251 */
1252
1253static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1254 struct dentry *dentry, umode_t mode)
1255{
1256 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1257 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1258}
1259
1260/**
1261 * gfs2_mknod - Make a special file
1262 * @idmap: idmap of the mount the inode was found from
1263 * @dir: The directory in which the special file will reside
1264 * @dentry: The dentry of the special file
1265 * @mode: The mode of the special file
1266 * @dev: The device specification of the special file
1267 *
1268 */
1269
1270static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1271 struct dentry *dentry, umode_t mode, dev_t dev)
1272{
1273 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1274}
1275
1276/**
1277 * gfs2_atomic_open - Atomically open a file
1278 * @dir: The directory
1279 * @dentry: The proposed new entry
1280 * @file: The proposed new struct file
1281 * @flags: open flags
1282 * @mode: File mode
1283 *
1284 * Returns: error code or 0 for success
1285 */
1286
1287static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1288 struct file *file, unsigned flags,
1289 umode_t mode)
1290{
1291 struct dentry *d;
1292 bool excl = !!(flags & O_EXCL);
1293
1294 if (!d_in_lookup(dentry))
1295 goto skip_lookup;
1296
1297 d = __gfs2_lookup(dir, dentry, file);
1298 if (IS_ERR(d))
1299 return PTR_ERR(d);
1300 if (d != NULL)
1301 dentry = d;
1302 if (d_really_is_positive(dentry)) {
1303 if (!(file->f_mode & FMODE_OPENED))
1304 return finish_no_open(file, d);
1305 dput(d);
1306 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1307 }
1308
1309 BUG_ON(d != NULL);
1310
1311skip_lookup:
1312 if (!(flags & O_CREAT))
1313 return -ENOENT;
1314
1315 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1316}
1317
1318/*
1319 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1320 * @this: move this
1321 * @to: to here
1322 *
1323 * Follow @to back to the root and make sure we don't encounter @this
1324 * Assumes we already hold the rename lock.
1325 *
1326 * Returns: errno
1327 */
1328
1329static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1330{
1331 struct inode *dir = &to->i_inode;
1332 struct super_block *sb = dir->i_sb;
1333 struct inode *tmp;
1334 int error = 0;
1335
1336 igrab(dir);
1337
1338 for (;;) {
1339 if (dir == &this->i_inode) {
1340 error = -EINVAL;
1341 break;
1342 }
1343 if (dir == d_inode(sb->s_root)) {
1344 error = 0;
1345 break;
1346 }
1347
1348 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1349 if (!tmp) {
1350 error = -ENOENT;
1351 break;
1352 }
1353 if (IS_ERR(tmp)) {
1354 error = PTR_ERR(tmp);
1355 break;
1356 }
1357
1358 iput(dir);
1359 dir = tmp;
1360 }
1361
1362 iput(dir);
1363
1364 return error;
1365}
1366
1367/**
1368 * update_moved_ino - Update an inode that's being moved
1369 * @ip: The inode being moved
1370 * @ndip: The parent directory of the new filename
1371 * @dir_rename: True of ip is a directory
1372 *
1373 * Returns: errno
1374 */
1375
1376static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1377 int dir_rename)
1378{
1379 if (dir_rename)
1380 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1381
1382 inode_set_ctime_current(&ip->i_inode);
1383 mark_inode_dirty_sync(&ip->i_inode);
1384 return 0;
1385}
1386
1387
1388/**
1389 * gfs2_rename - Rename a file
1390 * @odir: Parent directory of old file name
1391 * @odentry: The old dentry of the file
1392 * @ndir: Parent directory of new file name
1393 * @ndentry: The new dentry of the file
1394 *
1395 * Returns: errno
1396 */
1397
1398static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1399 struct inode *ndir, struct dentry *ndentry)
1400{
1401 struct gfs2_inode *odip = GFS2_I(odir);
1402 struct gfs2_inode *ndip = GFS2_I(ndir);
1403 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1404 struct gfs2_inode *nip = NULL;
1405 struct gfs2_sbd *sdp = GFS2_SB(odir);
1406 struct gfs2_holder ghs[4], r_gh, rd_gh;
1407 struct gfs2_rgrpd *nrgd;
1408 unsigned int num_gh;
1409 int dir_rename = 0;
1410 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1411 unsigned int x;
1412 int error;
1413
1414 gfs2_holder_mark_uninitialized(&r_gh);
1415 gfs2_holder_mark_uninitialized(&rd_gh);
1416 if (d_really_is_positive(ndentry)) {
1417 nip = GFS2_I(d_inode(ndentry));
1418 if (ip == nip)
1419 return 0;
1420 }
1421
1422 error = gfs2_rindex_update(sdp);
1423 if (error)
1424 return error;
1425
1426 error = gfs2_qa_get(ndip);
1427 if (error)
1428 return error;
1429
1430 if (odip != ndip) {
1431 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1432 0, &r_gh);
1433 if (error)
1434 goto out;
1435
1436 if (S_ISDIR(ip->i_inode.i_mode)) {
1437 dir_rename = 1;
1438 /* don't move a directory into its subdir */
1439 error = gfs2_ok_to_move(ip, ndip);
1440 if (error)
1441 goto out_gunlock_r;
1442 }
1443 }
1444
1445 num_gh = 1;
1446 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1447 if (odip != ndip) {
1448 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1449 ghs + num_gh);
1450 num_gh++;
1451 }
1452 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1453 num_gh++;
1454
1455 if (nip) {
1456 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1457 ghs + num_gh);
1458 num_gh++;
1459 }
1460
1461 for (x = 0; x < num_gh; x++) {
1462 error = gfs2_glock_nq(ghs + x);
1463 if (error)
1464 goto out_gunlock;
1465 }
1466 error = gfs2_glock_async_wait(num_gh, ghs);
1467 if (error)
1468 goto out_gunlock;
1469
1470 if (nip) {
1471 /* Grab the resource group glock for unlink flag twiddling.
1472 * This is the case where the target dinode already exists
1473 * so we unlink before doing the rename.
1474 */
1475 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1476 if (!nrgd) {
1477 error = -ENOENT;
1478 goto out_gunlock;
1479 }
1480 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1481 LM_FLAG_NODE_SCOPE, &rd_gh);
1482 if (error)
1483 goto out_gunlock;
1484 }
1485
1486 error = -ENOENT;
1487 if (ip->i_inode.i_nlink == 0)
1488 goto out_gunlock;
1489
1490 /* Check out the old directory */
1491
1492 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1493 if (error)
1494 goto out_gunlock;
1495
1496 /* Check out the new directory */
1497
1498 if (nip) {
1499 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1500 if (error)
1501 goto out_gunlock;
1502
1503 if (nip->i_inode.i_nlink == 0) {
1504 error = -EAGAIN;
1505 goto out_gunlock;
1506 }
1507
1508 if (S_ISDIR(nip->i_inode.i_mode)) {
1509 if (nip->i_entries < 2) {
1510 gfs2_consist_inode(nip);
1511 error = -EIO;
1512 goto out_gunlock;
1513 }
1514 if (nip->i_entries > 2) {
1515 error = -ENOTEMPTY;
1516 goto out_gunlock;
1517 }
1518 }
1519 } else {
1520 error = gfs2_permission(&nop_mnt_idmap, ndir,
1521 MAY_WRITE | MAY_EXEC);
1522 if (error)
1523 goto out_gunlock;
1524
1525 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1526 switch (error) {
1527 case -ENOENT:
1528 error = 0;
1529 break;
1530 case 0:
1531 error = -EEXIST;
1532 goto out_gunlock;
1533 default:
1534 goto out_gunlock;
1535 }
1536
1537 if (odip != ndip) {
1538 if (!ndip->i_inode.i_nlink) {
1539 error = -ENOENT;
1540 goto out_gunlock;
1541 }
1542 if (ndip->i_entries == (u32)-1) {
1543 error = -EFBIG;
1544 goto out_gunlock;
1545 }
1546 if (S_ISDIR(ip->i_inode.i_mode) &&
1547 ndip->i_inode.i_nlink == (u32)-1) {
1548 error = -EMLINK;
1549 goto out_gunlock;
1550 }
1551 }
1552 }
1553
1554 /* Check out the dir to be renamed */
1555
1556 if (dir_rename) {
1557 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1558 MAY_WRITE);
1559 if (error)
1560 goto out_gunlock;
1561 }
1562
1563 if (nip == NULL) {
1564 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1565 if (error)
1566 goto out_gunlock;
1567 }
1568
1569 if (da.nr_blocks) {
1570 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1571 error = gfs2_quota_lock_check(ndip, &ap);
1572 if (error)
1573 goto out_gunlock;
1574
1575 error = gfs2_inplace_reserve(ndip, &ap);
1576 if (error)
1577 goto out_gunlock_q;
1578
1579 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1580 4 * RES_LEAF + 4, 0);
1581 if (error)
1582 goto out_ipreserv;
1583 } else {
1584 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1585 5 * RES_LEAF + 4, 0);
1586 if (error)
1587 goto out_gunlock;
1588 }
1589
1590 /* Remove the target file, if it exists */
1591
1592 if (nip)
1593 error = gfs2_unlink_inode(ndip, ndentry);
1594
1595 error = update_moved_ino(ip, ndip, dir_rename);
1596 if (error)
1597 goto out_end_trans;
1598
1599 error = gfs2_dir_del(odip, odentry);
1600 if (error)
1601 goto out_end_trans;
1602
1603 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1604 if (error)
1605 goto out_end_trans;
1606
1607out_end_trans:
1608 gfs2_trans_end(sdp);
1609out_ipreserv:
1610 if (da.nr_blocks)
1611 gfs2_inplace_release(ndip);
1612out_gunlock_q:
1613 if (da.nr_blocks)
1614 gfs2_quota_unlock(ndip);
1615out_gunlock:
1616 gfs2_dir_no_add(&da);
1617 if (gfs2_holder_initialized(&rd_gh))
1618 gfs2_glock_dq_uninit(&rd_gh);
1619
1620 while (x--) {
1621 if (gfs2_holder_queued(ghs + x))
1622 gfs2_glock_dq(ghs + x);
1623 gfs2_holder_uninit(ghs + x);
1624 }
1625out_gunlock_r:
1626 if (gfs2_holder_initialized(&r_gh))
1627 gfs2_glock_dq_uninit(&r_gh);
1628out:
1629 gfs2_qa_put(ndip);
1630 return error;
1631}
1632
1633/**
1634 * gfs2_exchange - exchange two files
1635 * @odir: Parent directory of old file name
1636 * @odentry: The old dentry of the file
1637 * @ndir: Parent directory of new file name
1638 * @ndentry: The new dentry of the file
1639 * @flags: The rename flags
1640 *
1641 * Returns: errno
1642 */
1643
1644static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1645 struct inode *ndir, struct dentry *ndentry,
1646 unsigned int flags)
1647{
1648 struct gfs2_inode *odip = GFS2_I(odir);
1649 struct gfs2_inode *ndip = GFS2_I(ndir);
1650 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1651 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1652 struct gfs2_sbd *sdp = GFS2_SB(odir);
1653 struct gfs2_holder ghs[4], r_gh;
1654 unsigned int num_gh;
1655 unsigned int x;
1656 umode_t old_mode = oip->i_inode.i_mode;
1657 umode_t new_mode = nip->i_inode.i_mode;
1658 int error;
1659
1660 gfs2_holder_mark_uninitialized(&r_gh);
1661 error = gfs2_rindex_update(sdp);
1662 if (error)
1663 return error;
1664
1665 if (odip != ndip) {
1666 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1667 0, &r_gh);
1668 if (error)
1669 goto out;
1670
1671 if (S_ISDIR(old_mode)) {
1672 /* don't move a directory into its subdir */
1673 error = gfs2_ok_to_move(oip, ndip);
1674 if (error)
1675 goto out_gunlock_r;
1676 }
1677
1678 if (S_ISDIR(new_mode)) {
1679 /* don't move a directory into its subdir */
1680 error = gfs2_ok_to_move(nip, odip);
1681 if (error)
1682 goto out_gunlock_r;
1683 }
1684 }
1685
1686 num_gh = 1;
1687 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1688 if (odip != ndip) {
1689 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1690 ghs + num_gh);
1691 num_gh++;
1692 }
1693 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1694 num_gh++;
1695
1696 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1697 num_gh++;
1698
1699 for (x = 0; x < num_gh; x++) {
1700 error = gfs2_glock_nq(ghs + x);
1701 if (error)
1702 goto out_gunlock;
1703 }
1704
1705 error = gfs2_glock_async_wait(num_gh, ghs);
1706 if (error)
1707 goto out_gunlock;
1708
1709 error = -ENOENT;
1710 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1711 goto out_gunlock;
1712
1713 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1714 if (error)
1715 goto out_gunlock;
1716 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1717 if (error)
1718 goto out_gunlock;
1719
1720 if (S_ISDIR(old_mode)) {
1721 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1722 MAY_WRITE);
1723 if (error)
1724 goto out_gunlock;
1725 }
1726 if (S_ISDIR(new_mode)) {
1727 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1728 MAY_WRITE);
1729 if (error)
1730 goto out_gunlock;
1731 }
1732 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1733 if (error)
1734 goto out_gunlock;
1735
1736 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1737 if (error)
1738 goto out_end_trans;
1739
1740 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1741 if (error)
1742 goto out_end_trans;
1743
1744 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1745 IF2DT(old_mode));
1746 if (error)
1747 goto out_end_trans;
1748
1749 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1750 IF2DT(new_mode));
1751 if (error)
1752 goto out_end_trans;
1753
1754 if (odip != ndip) {
1755 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1756 inc_nlink(&odip->i_inode);
1757 drop_nlink(&ndip->i_inode);
1758 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1759 inc_nlink(&ndip->i_inode);
1760 drop_nlink(&odip->i_inode);
1761 }
1762 }
1763 mark_inode_dirty(&ndip->i_inode);
1764 if (odip != ndip)
1765 mark_inode_dirty(&odip->i_inode);
1766
1767out_end_trans:
1768 gfs2_trans_end(sdp);
1769out_gunlock:
1770 while (x--) {
1771 if (gfs2_holder_queued(ghs + x))
1772 gfs2_glock_dq(ghs + x);
1773 gfs2_holder_uninit(ghs + x);
1774 }
1775out_gunlock_r:
1776 if (gfs2_holder_initialized(&r_gh))
1777 gfs2_glock_dq_uninit(&r_gh);
1778out:
1779 return error;
1780}
1781
1782static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1783 struct dentry *odentry, struct inode *ndir,
1784 struct dentry *ndentry, unsigned int flags)
1785{
1786 flags &= ~RENAME_NOREPLACE;
1787
1788 if (flags & ~RENAME_EXCHANGE)
1789 return -EINVAL;
1790
1791 if (flags & RENAME_EXCHANGE)
1792 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1793
1794 return gfs2_rename(odir, odentry, ndir, ndentry);
1795}
1796
1797/**
1798 * gfs2_get_link - Follow a symbolic link
1799 * @dentry: The dentry of the link
1800 * @inode: The inode of the link
1801 * @done: destructor for return value
1802 *
1803 * This can handle symlinks of any size.
1804 *
1805 * Returns: 0 on success or error code
1806 */
1807
1808static const char *gfs2_get_link(struct dentry *dentry,
1809 struct inode *inode,
1810 struct delayed_call *done)
1811{
1812 struct gfs2_inode *ip = GFS2_I(inode);
1813 struct gfs2_holder i_gh;
1814 struct buffer_head *dibh;
1815 unsigned int size;
1816 char *buf;
1817 int error;
1818
1819 if (!dentry)
1820 return ERR_PTR(-ECHILD);
1821
1822 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1823 error = gfs2_glock_nq(&i_gh);
1824 if (error) {
1825 gfs2_holder_uninit(&i_gh);
1826 return ERR_PTR(error);
1827 }
1828
1829 size = (unsigned int)i_size_read(&ip->i_inode);
1830 if (size == 0) {
1831 gfs2_consist_inode(ip);
1832 buf = ERR_PTR(-EIO);
1833 goto out;
1834 }
1835
1836 error = gfs2_meta_inode_buffer(ip, &dibh);
1837 if (error) {
1838 buf = ERR_PTR(error);
1839 goto out;
1840 }
1841
1842 buf = kzalloc(size + 1, GFP_NOFS);
1843 if (!buf)
1844 buf = ERR_PTR(-ENOMEM);
1845 else
1846 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1847 brelse(dibh);
1848out:
1849 gfs2_glock_dq_uninit(&i_gh);
1850 if (!IS_ERR(buf))
1851 set_delayed_call(done, kfree_link, buf);
1852 return buf;
1853}
1854
1855/**
1856 * gfs2_permission
1857 * @idmap: idmap of the mount the inode was found from
1858 * @inode: The inode
1859 * @mask: The mask to be tested
1860 *
1861 * This may be called from the VFS directly, or from within GFS2 with the
1862 * inode locked, so we look to see if the glock is already locked and only
1863 * lock the glock if its not already been done.
1864 *
1865 * Returns: errno
1866 */
1867
1868int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1869 int mask)
1870{
1871 int may_not_block = mask & MAY_NOT_BLOCK;
1872 struct gfs2_inode *ip;
1873 struct gfs2_holder i_gh;
1874 struct gfs2_glock *gl;
1875 int error;
1876
1877 gfs2_holder_mark_uninitialized(&i_gh);
1878 ip = GFS2_I(inode);
1879 gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1880 if (unlikely(!gl)) {
1881 /* inode is getting torn down, must be RCU mode */
1882 WARN_ON_ONCE(!may_not_block);
1883 return -ECHILD;
1884 }
1885 if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1886 if (may_not_block)
1887 return -ECHILD;
1888 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1889 if (error)
1890 return error;
1891 }
1892
1893 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1894 error = -EPERM;
1895 else
1896 error = generic_permission(&nop_mnt_idmap, inode, mask);
1897 if (gfs2_holder_initialized(&i_gh))
1898 gfs2_glock_dq_uninit(&i_gh);
1899
1900 return error;
1901}
1902
1903static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1904{
1905 setattr_copy(&nop_mnt_idmap, inode, attr);
1906 mark_inode_dirty(inode);
1907 return 0;
1908}
1909
1910static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1911{
1912 int error;
1913
1914 if (current->journal_info)
1915 return __gfs2_setattr_simple(inode, attr);
1916
1917 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1918 if (error)
1919 return error;
1920
1921 error = __gfs2_setattr_simple(inode, attr);
1922 gfs2_trans_end(GFS2_SB(inode));
1923 return error;
1924}
1925
1926static int setattr_chown(struct inode *inode, struct iattr *attr)
1927{
1928 struct gfs2_inode *ip = GFS2_I(inode);
1929 struct gfs2_sbd *sdp = GFS2_SB(inode);
1930 kuid_t ouid, nuid;
1931 kgid_t ogid, ngid;
1932 int error;
1933 struct gfs2_alloc_parms ap = {};
1934
1935 ouid = inode->i_uid;
1936 ogid = inode->i_gid;
1937 nuid = attr->ia_uid;
1938 ngid = attr->ia_gid;
1939
1940 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1941 ouid = nuid = NO_UID_QUOTA_CHANGE;
1942 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1943 ogid = ngid = NO_GID_QUOTA_CHANGE;
1944 error = gfs2_qa_get(ip);
1945 if (error)
1946 return error;
1947
1948 error = gfs2_rindex_update(sdp);
1949 if (error)
1950 goto out;
1951
1952 error = gfs2_quota_lock(ip, nuid, ngid);
1953 if (error)
1954 goto out;
1955
1956 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1957
1958 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1959 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1960 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1961 if (error)
1962 goto out_gunlock_q;
1963 }
1964
1965 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1966 if (error)
1967 goto out_gunlock_q;
1968
1969 error = gfs2_setattr_simple(inode, attr);
1970 if (error)
1971 goto out_end_trans;
1972
1973 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1974 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1975 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1976 gfs2_quota_change(ip, ap.target, nuid, ngid);
1977 }
1978
1979out_end_trans:
1980 gfs2_trans_end(sdp);
1981out_gunlock_q:
1982 gfs2_quota_unlock(ip);
1983out:
1984 gfs2_qa_put(ip);
1985 return error;
1986}
1987
1988/**
1989 * gfs2_setattr - Change attributes on an inode
1990 * @idmap: idmap of the mount the inode was found from
1991 * @dentry: The dentry which is changing
1992 * @attr: The structure describing the change
1993 *
1994 * The VFS layer wants to change one or more of an inodes attributes. Write
1995 * that change out to disk.
1996 *
1997 * Returns: errno
1998 */
1999
2000static int gfs2_setattr(struct mnt_idmap *idmap,
2001 struct dentry *dentry, struct iattr *attr)
2002{
2003 struct inode *inode = d_inode(dentry);
2004 struct gfs2_inode *ip = GFS2_I(inode);
2005 struct gfs2_holder i_gh;
2006 int error;
2007
2008 error = gfs2_qa_get(ip);
2009 if (error)
2010 return error;
2011
2012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2013 if (error)
2014 goto out;
2015
2016 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2017 if (error)
2018 goto error;
2019
2020 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2021 if (error)
2022 goto error;
2023
2024 if (attr->ia_valid & ATTR_SIZE)
2025 error = gfs2_setattr_size(inode, attr->ia_size);
2026 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2027 error = setattr_chown(inode, attr);
2028 else {
2029 error = gfs2_setattr_simple(inode, attr);
2030 if (!error && attr->ia_valid & ATTR_MODE)
2031 error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2032 inode->i_mode);
2033 }
2034
2035error:
2036 if (!error)
2037 mark_inode_dirty(inode);
2038 gfs2_glock_dq_uninit(&i_gh);
2039out:
2040 gfs2_qa_put(ip);
2041 return error;
2042}
2043
2044/**
2045 * gfs2_getattr - Read out an inode's attributes
2046 * @idmap: idmap of the mount the inode was found from
2047 * @path: Object to query
2048 * @stat: The inode's stats
2049 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2050 * @flags: AT_STATX_xxx setting
2051 *
2052 * This may be called from the VFS directly, or from within GFS2 with the
2053 * inode locked, so we look to see if the glock is already locked and only
2054 * lock the glock if its not already been done. Note that its the NFS
2055 * readdirplus operation which causes this to be called (from filldir)
2056 * with the glock already held.
2057 *
2058 * Returns: errno
2059 */
2060
2061static int gfs2_getattr(struct mnt_idmap *idmap,
2062 const struct path *path, struct kstat *stat,
2063 u32 request_mask, unsigned int flags)
2064{
2065 struct inode *inode = d_inode(path->dentry);
2066 struct gfs2_inode *ip = GFS2_I(inode);
2067 struct gfs2_holder gh;
2068 u32 gfsflags;
2069 int error;
2070
2071 gfs2_holder_mark_uninitialized(&gh);
2072 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2073 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2074 if (error)
2075 return error;
2076 }
2077
2078 gfsflags = ip->i_diskflags;
2079 if (gfsflags & GFS2_DIF_APPENDONLY)
2080 stat->attributes |= STATX_ATTR_APPEND;
2081 if (gfsflags & GFS2_DIF_IMMUTABLE)
2082 stat->attributes |= STATX_ATTR_IMMUTABLE;
2083
2084 stat->attributes_mask |= (STATX_ATTR_APPEND |
2085 STATX_ATTR_COMPRESSED |
2086 STATX_ATTR_ENCRYPTED |
2087 STATX_ATTR_IMMUTABLE |
2088 STATX_ATTR_NODUMP);
2089
2090 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2091
2092 if (gfs2_holder_initialized(&gh))
2093 gfs2_glock_dq_uninit(&gh);
2094
2095 return 0;
2096}
2097
2098static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2099 u64 start, u64 len)
2100{
2101 struct gfs2_inode *ip = GFS2_I(inode);
2102 struct gfs2_holder gh;
2103 int ret;
2104
2105 inode_lock_shared(inode);
2106
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2108 if (ret)
2109 goto out;
2110
2111 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2112
2113 gfs2_glock_dq_uninit(&gh);
2114
2115out:
2116 inode_unlock_shared(inode);
2117 return ret;
2118}
2119
2120loff_t gfs2_seek_data(struct file *file, loff_t offset)
2121{
2122 struct inode *inode = file->f_mapping->host;
2123 struct gfs2_inode *ip = GFS2_I(inode);
2124 struct gfs2_holder gh;
2125 loff_t ret;
2126
2127 inode_lock_shared(inode);
2128 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2129 if (!ret)
2130 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2131 gfs2_glock_dq_uninit(&gh);
2132 inode_unlock_shared(inode);
2133
2134 if (ret < 0)
2135 return ret;
2136 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2137}
2138
2139loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2140{
2141 struct inode *inode = file->f_mapping->host;
2142 struct gfs2_inode *ip = GFS2_I(inode);
2143 struct gfs2_holder gh;
2144 loff_t ret;
2145
2146 inode_lock_shared(inode);
2147 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2148 if (!ret)
2149 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2150 gfs2_glock_dq_uninit(&gh);
2151 inode_unlock_shared(inode);
2152
2153 if (ret < 0)
2154 return ret;
2155 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2156}
2157
2158static int gfs2_update_time(struct inode *inode, int flags)
2159{
2160 struct gfs2_inode *ip = GFS2_I(inode);
2161 struct gfs2_glock *gl = ip->i_gl;
2162 struct gfs2_holder *gh;
2163 int error;
2164
2165 gh = gfs2_glock_is_locked_by_me(gl);
2166 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2167 gfs2_glock_dq(gh);
2168 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2169 error = gfs2_glock_nq(gh);
2170 if (error)
2171 return error;
2172 }
2173 generic_update_time(inode, flags);
2174 return 0;
2175}
2176
2177static const struct inode_operations gfs2_file_iops = {
2178 .permission = gfs2_permission,
2179 .setattr = gfs2_setattr,
2180 .getattr = gfs2_getattr,
2181 .listxattr = gfs2_listxattr,
2182 .fiemap = gfs2_fiemap,
2183 .get_inode_acl = gfs2_get_acl,
2184 .set_acl = gfs2_set_acl,
2185 .update_time = gfs2_update_time,
2186 .fileattr_get = gfs2_fileattr_get,
2187 .fileattr_set = gfs2_fileattr_set,
2188};
2189
2190static const struct inode_operations gfs2_dir_iops = {
2191 .create = gfs2_create,
2192 .lookup = gfs2_lookup,
2193 .link = gfs2_link,
2194 .unlink = gfs2_unlink,
2195 .symlink = gfs2_symlink,
2196 .mkdir = gfs2_mkdir,
2197 .rmdir = gfs2_unlink,
2198 .mknod = gfs2_mknod,
2199 .rename = gfs2_rename2,
2200 .permission = gfs2_permission,
2201 .setattr = gfs2_setattr,
2202 .getattr = gfs2_getattr,
2203 .listxattr = gfs2_listxattr,
2204 .fiemap = gfs2_fiemap,
2205 .get_inode_acl = gfs2_get_acl,
2206 .set_acl = gfs2_set_acl,
2207 .update_time = gfs2_update_time,
2208 .atomic_open = gfs2_atomic_open,
2209 .fileattr_get = gfs2_fileattr_get,
2210 .fileattr_set = gfs2_fileattr_set,
2211};
2212
2213static const struct inode_operations gfs2_symlink_iops = {
2214 .get_link = gfs2_get_link,
2215 .permission = gfs2_permission,
2216 .setattr = gfs2_setattr,
2217 .getattr = gfs2_getattr,
2218 .listxattr = gfs2_listxattr,
2219 .fiemap = gfs2_fiemap,
2220};
2221