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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/namei.h>
15#include <linux/mm.h>
16#include <linux/xattr.h>
17#include <linux/posix_acl.h>
18#include <linux/gfs2_ondisk.h>
19#include <linux/crc32.h>
20#include <linux/fiemap.h>
21#include <linux/security.h>
22#include <asm/uaccess.h>
23
24#include "gfs2.h"
25#include "incore.h"
26#include "acl.h"
27#include "bmap.h"
28#include "dir.h"
29#include "xattr.h"
30#include "glock.h"
31#include "inode.h"
32#include "meta_io.h"
33#include "quota.h"
34#include "rgrp.h"
35#include "trans.h"
36#include "util.h"
37#include "super.h"
38#include "glops.h"
39
40struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44};
45
46static int iget_test(struct inode *inode, void *opaque)
47{
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60}
61
62static int iget_set(struct inode *inode, void *opaque)
63{
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72}
73
74struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75{
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83}
84
85static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87{
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95}
96
97/**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105static void gfs2_set_iop(struct inode *inode)
106{
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128}
129
130/**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142{
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOBUFS);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191fail_refresh:
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
194fail_iopen:
195 if (io_gl)
196 gfs2_glock_put(io_gl);
197fail_put:
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
200fail:
201 iget_failed(inode);
202 return ERR_PTR(error);
203}
204
205struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
207{
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
211 int error;
212
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
216 if (error)
217 return ERR_PTR(error);
218
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
220 if (error)
221 goto fail;
222
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
224 if (IS_ERR(inode))
225 goto fail;
226
227 /* Two extra checks for NFS only */
228 if (no_formal_ino) {
229 error = -ESTALE;
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
231 goto fail_iput;
232
233 error = -EIO;
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
235 goto fail_iput;
236
237 error = 0;
238 }
239
240fail:
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
243fail_iput:
244 iput(inode);
245 goto fail;
246}
247
248
249struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
250{
251 struct qstr qstr;
252 struct inode *inode;
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
259 */
260 if (inode == NULL)
261 return ERR_PTR(-ENOENT);
262 else
263 return inode;
264}
265
266
267/**
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
273 *
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
278 *
279 * Returns: errno
280 */
281
282struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
283 int is_root)
284{
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
288 int error = 0;
289 struct inode *inode = NULL;
290 int unlock = 0;
291
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
294
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
298 igrab(dir);
299 return dir;
300 }
301
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
304 if (error)
305 return ERR_PTR(error);
306 unlock = 1;
307 }
308
309 if (!is_root) {
310 error = gfs2_permission(dir, MAY_EXEC);
311 if (error)
312 goto out;
313 }
314
315 inode = gfs2_dir_search(dir, name);
316 if (IS_ERR(inode))
317 error = PTR_ERR(inode);
318out:
319 if (unlock)
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
322 return NULL;
323 return inode ? inode : ERR_PTR(error);
324}
325
326/**
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
330 * @mode:
331 *
332 * Returns: errno
333 */
334
335static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
336 unsigned int mode)
337{
338 int error;
339
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
341 if (error)
342 return error;
343
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
346 return -ENOENT;
347
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
349 switch (error) {
350 case -ENOENT:
351 error = 0;
352 break;
353 case 0:
354 return -EEXIST;
355 default:
356 return error;
357 }
358
359 if (dip->i_entries == (u32)-1)
360 return -EFBIG;
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
362 return -EMLINK;
363
364 return 0;
365}
366
367static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
368 unsigned int *uid, unsigned int *gid)
369{
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
372 if (S_ISDIR(*mode))
373 *mode |= S_ISUID;
374 else if (dip->i_inode.i_uid != current_fsuid())
375 *mode &= ~07111;
376 *uid = dip->i_inode.i_uid;
377 } else
378 *uid = current_fsuid();
379
380 if (dip->i_inode.i_mode & S_ISGID) {
381 if (S_ISDIR(*mode))
382 *mode |= S_ISGID;
383 *gid = dip->i_inode.i_gid;
384 } else
385 *gid = current_fsgid();
386}
387
388static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
389{
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
391 int error;
392
393 if (gfs2_alloc_get(dip) == NULL)
394 return -ENOMEM;
395
396 dip->i_alloc->al_requested = RES_DINODE;
397 error = gfs2_inplace_reserve(dip);
398 if (error)
399 goto out;
400
401 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 if (error)
403 goto out_ipreserv;
404
405 error = gfs2_alloc_di(dip, no_addr, generation);
406
407 gfs2_trans_end(sdp);
408
409out_ipreserv:
410 gfs2_inplace_release(dip);
411out:
412 gfs2_alloc_put(dip);
413 return error;
414}
415
416static void gfs2_init_dir(struct buffer_head *dibh,
417 const struct gfs2_inode *parent)
418{
419 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
420 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
421
422 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
423 dent->de_inum = di->di_num; /* already GFS2 endian */
424 dent->de_type = cpu_to_be16(DT_DIR);
425
426 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
427 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
428 gfs2_inum_out(parent, dent);
429 dent->de_type = cpu_to_be16(DT_DIR);
430
431}
432
433/**
434 * init_dinode - Fill in a new dinode structure
435 * @dip: The directory this inode is being created in
436 * @gl: The glock covering the new inode
437 * @inum: The inode number
438 * @mode: The file permissions
439 * @uid: The uid of the new inode
440 * @gid: The gid of the new inode
441 * @generation: The generation number of the new inode
442 * @dev: The device number (if a device node)
443 * @symname: The symlink destination (if a symlink)
444 * @size: The inode size (ignored for directories)
445 * @bhp: The buffer head (returned to caller)
446 *
447 */
448
449static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
450 const struct gfs2_inum_host *inum, unsigned int mode,
451 unsigned int uid, unsigned int gid,
452 const u64 *generation, dev_t dev, const char *symname,
453 unsigned size, struct buffer_head **bhp)
454{
455 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
456 struct gfs2_dinode *di;
457 struct buffer_head *dibh;
458 struct timespec tv = CURRENT_TIME;
459
460 dibh = gfs2_meta_new(gl, inum->no_addr);
461 gfs2_trans_add_bh(gl, dibh, 1);
462 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
463 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
464 di = (struct gfs2_dinode *)dibh->b_data;
465
466 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
467 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
468 di->di_mode = cpu_to_be32(mode);
469 di->di_uid = cpu_to_be32(uid);
470 di->di_gid = cpu_to_be32(gid);
471 di->di_nlink = 0;
472 di->di_size = cpu_to_be64(size);
473 di->di_blocks = cpu_to_be64(1);
474 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
475 di->di_major = cpu_to_be32(MAJOR(dev));
476 di->di_minor = cpu_to_be32(MINOR(dev));
477 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
478 di->di_generation = cpu_to_be64(*generation);
479 di->di_flags = 0;
480 di->__pad1 = 0;
481 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
482 di->di_height = 0;
483 di->__pad2 = 0;
484 di->__pad3 = 0;
485 di->di_depth = 0;
486 di->di_entries = 0;
487 memset(&di->__pad4, 0, sizeof(di->__pad4));
488 di->di_eattr = 0;
489 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
490 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
491 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
492 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
493
494 switch(mode & S_IFMT) {
495 case S_IFREG:
496 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
497 gfs2_tune_get(sdp, gt_new_files_jdata))
498 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
499 break;
500 case S_IFDIR:
501 di->di_flags |= cpu_to_be32(dip->i_diskflags &
502 GFS2_DIF_INHERIT_JDATA);
503 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
504 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
505 di->di_entries = cpu_to_be32(2);
506 gfs2_init_dir(dibh, dip);
507 break;
508 case S_IFLNK:
509 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
510 break;
511 }
512
513 set_buffer_uptodate(dibh);
514
515 *bhp = dibh;
516}
517
518static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
519 unsigned int mode, const struct gfs2_inum_host *inum,
520 const u64 *generation, dev_t dev, const char *symname,
521 unsigned int size, struct buffer_head **bhp)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 unsigned int uid, gid;
525 int error;
526
527 munge_mode_uid_gid(dip, &mode, &uid, &gid);
528 if (!gfs2_alloc_get(dip))
529 return -ENOMEM;
530
531 error = gfs2_quota_lock(dip, uid, gid);
532 if (error)
533 goto out;
534
535 error = gfs2_quota_check(dip, uid, gid);
536 if (error)
537 goto out_quota;
538
539 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
540 if (error)
541 goto out_quota;
542
543 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
544 gfs2_quota_change(dip, +1, uid, gid);
545 gfs2_trans_end(sdp);
546
547out_quota:
548 gfs2_quota_unlock(dip);
549out:
550 gfs2_alloc_put(dip);
551 return error;
552}
553
554static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
555 struct gfs2_inode *ip)
556{
557 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
558 struct gfs2_alloc *al;
559 int alloc_required;
560 struct buffer_head *dibh;
561 int error;
562
563 al = gfs2_alloc_get(dip);
564 if (!al)
565 return -ENOMEM;
566
567 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
568 if (error)
569 goto fail;
570
571 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
572 if (alloc_required < 0)
573 goto fail_quota_locks;
574 if (alloc_required) {
575 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
576 if (error)
577 goto fail_quota_locks;
578
579 al->al_requested = sdp->sd_max_dirres;
580
581 error = gfs2_inplace_reserve(dip);
582 if (error)
583 goto fail_quota_locks;
584
585 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
586 al->al_rgd->rd_length +
587 2 * RES_DINODE +
588 RES_STATFS + RES_QUOTA, 0);
589 if (error)
590 goto fail_ipreserv;
591 } else {
592 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
593 if (error)
594 goto fail_quota_locks;
595 }
596
597 error = gfs2_dir_add(&dip->i_inode, name, ip);
598 if (error)
599 goto fail_end_trans;
600
601 error = gfs2_meta_inode_buffer(ip, &dibh);
602 if (error)
603 goto fail_end_trans;
604 inc_nlink(&ip->i_inode);
605 if (S_ISDIR(ip->i_inode.i_mode))
606 inc_nlink(&ip->i_inode);
607 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
608 gfs2_dinode_out(ip, dibh->b_data);
609 brelse(dibh);
610 return 0;
611
612fail_end_trans:
613 gfs2_trans_end(sdp);
614
615fail_ipreserv:
616 if (dip->i_alloc->al_rgd)
617 gfs2_inplace_release(dip);
618
619fail_quota_locks:
620 gfs2_quota_unlock(dip);
621
622fail:
623 gfs2_alloc_put(dip);
624 return error;
625}
626
627static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
628 const struct qstr *qstr)
629{
630 int err;
631 size_t len;
632 void *value;
633 char *name;
634
635 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
636 &name, &value, &len);
637
638 if (err) {
639 if (err == -EOPNOTSUPP)
640 return 0;
641 return err;
642 }
643
644 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
645 GFS2_EATYPE_SECURITY);
646 kfree(value);
647 kfree(name);
648
649 return err;
650}
651
652/**
653 * gfs2_create_inode - Create a new inode
654 * @dir: The parent directory
655 * @dentry: The new dentry
656 * @mode: The permissions on the new inode
657 * @dev: For device nodes, this is the device number
658 * @symname: For symlinks, this is the link destination
659 * @size: The initial size of the inode (ignored for directories)
660 *
661 * Returns: 0 on success, or error code
662 */
663
664static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
665 unsigned int mode, dev_t dev, const char *symname,
666 unsigned int size)
667{
668 const struct qstr *name = &dentry->d_name;
669 struct gfs2_holder ghs[2];
670 struct inode *inode = NULL;
671 struct gfs2_inode *dip = GFS2_I(dir);
672 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
673 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
674 int error;
675 u64 generation;
676 struct buffer_head *bh = NULL;
677
678 if (!name->len || name->len > GFS2_FNAMESIZE)
679 return -ENAMETOOLONG;
680
681 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
682 if (error)
683 goto fail;
684
685 error = create_ok(dip, name, mode);
686 if (error)
687 goto fail_gunlock;
688
689 error = alloc_dinode(dip, &inum.no_addr, &generation);
690 if (error)
691 goto fail_gunlock;
692 inum.no_formal_ino = generation;
693
694 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
695 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
696 if (error)
697 goto fail_gunlock;
698
699 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
700 if (error)
701 goto fail_gunlock2;
702
703 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
704 inum.no_formal_ino, 0);
705 if (IS_ERR(inode))
706 goto fail_gunlock2;
707
708 error = gfs2_inode_refresh(GFS2_I(inode));
709 if (error)
710 goto fail_gunlock2;
711
712 error = gfs2_acl_create(dip, inode);
713 if (error)
714 goto fail_gunlock2;
715
716 error = gfs2_security_init(dip, GFS2_I(inode), name);
717 if (error)
718 goto fail_gunlock2;
719
720 error = link_dinode(dip, name, GFS2_I(inode));
721 if (error)
722 goto fail_gunlock2;
723
724 if (bh)
725 brelse(bh);
726
727 gfs2_trans_end(sdp);
728 if (dip->i_alloc->al_rgd)
729 gfs2_inplace_release(dip);
730 gfs2_quota_unlock(dip);
731 gfs2_alloc_put(dip);
732 gfs2_glock_dq_uninit_m(2, ghs);
733 mark_inode_dirty(inode);
734 d_instantiate(dentry, inode);
735 return 0;
736
737fail_gunlock2:
738 gfs2_glock_dq_uninit(ghs + 1);
739 if (inode && !IS_ERR(inode))
740 iput(inode);
741fail_gunlock:
742 gfs2_glock_dq_uninit(ghs);
743fail:
744 if (bh)
745 brelse(bh);
746 return error;
747}
748
749/**
750 * gfs2_create - Create a file
751 * @dir: The directory in which to create the file
752 * @dentry: The dentry of the new file
753 * @mode: The mode of the new file
754 *
755 * Returns: errno
756 */
757
758static int gfs2_create(struct inode *dir, struct dentry *dentry,
759 int mode, struct nameidata *nd)
760{
761 struct inode *inode;
762 int ret;
763
764 for (;;) {
765 ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0);
766 if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL)))
767 return ret;
768
769 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
770 if (inode) {
771 if (!IS_ERR(inode))
772 break;
773 return PTR_ERR(inode);
774 }
775 }
776
777 d_instantiate(dentry, inode);
778 return 0;
779}
780
781/**
782 * gfs2_lookup - Look up a filename in a directory and return its inode
783 * @dir: The directory inode
784 * @dentry: The dentry of the new inode
785 * @nd: passed from Linux VFS, ignored by us
786 *
787 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
788 *
789 * Returns: errno
790 */
791
792static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
793 struct nameidata *nd)
794{
795 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
796 if (inode && !IS_ERR(inode)) {
797 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
798 struct gfs2_holder gh;
799 int error;
800 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
801 if (error) {
802 iput(inode);
803 return ERR_PTR(error);
804 }
805 gfs2_glock_dq_uninit(&gh);
806 }
807 return d_splice_alias(inode, dentry);
808}
809
810/**
811 * gfs2_link - Link to a file
812 * @old_dentry: The inode to link
813 * @dir: Add link to this directory
814 * @dentry: The name of the link
815 *
816 * Link the inode in "old_dentry" into the directory "dir" with the
817 * name in "dentry".
818 *
819 * Returns: errno
820 */
821
822static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
823 struct dentry *dentry)
824{
825 struct gfs2_inode *dip = GFS2_I(dir);
826 struct gfs2_sbd *sdp = GFS2_SB(dir);
827 struct inode *inode = old_dentry->d_inode;
828 struct gfs2_inode *ip = GFS2_I(inode);
829 struct gfs2_holder ghs[2];
830 struct buffer_head *dibh;
831 int alloc_required;
832 int error;
833
834 if (S_ISDIR(inode->i_mode))
835 return -EPERM;
836
837 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
838 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
839
840 error = gfs2_glock_nq(ghs); /* parent */
841 if (error)
842 goto out_parent;
843
844 error = gfs2_glock_nq(ghs + 1); /* child */
845 if (error)
846 goto out_child;
847
848 error = -ENOENT;
849 if (inode->i_nlink == 0)
850 goto out_gunlock;
851
852 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
853 if (error)
854 goto out_gunlock;
855
856 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
857 switch (error) {
858 case -ENOENT:
859 break;
860 case 0:
861 error = -EEXIST;
862 default:
863 goto out_gunlock;
864 }
865
866 error = -EINVAL;
867 if (!dip->i_inode.i_nlink)
868 goto out_gunlock;
869 error = -EFBIG;
870 if (dip->i_entries == (u32)-1)
871 goto out_gunlock;
872 error = -EPERM;
873 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
874 goto out_gunlock;
875 error = -EINVAL;
876 if (!ip->i_inode.i_nlink)
877 goto out_gunlock;
878 error = -EMLINK;
879 if (ip->i_inode.i_nlink == (u32)-1)
880 goto out_gunlock;
881
882 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
883 if (error < 0)
884 goto out_gunlock;
885 error = 0;
886
887 if (alloc_required) {
888 struct gfs2_alloc *al = gfs2_alloc_get(dip);
889 if (!al) {
890 error = -ENOMEM;
891 goto out_gunlock;
892 }
893
894 error = gfs2_quota_lock_check(dip);
895 if (error)
896 goto out_alloc;
897
898 al->al_requested = sdp->sd_max_dirres;
899
900 error = gfs2_inplace_reserve(dip);
901 if (error)
902 goto out_gunlock_q;
903
904 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
905 gfs2_rg_blocks(al) +
906 2 * RES_DINODE + RES_STATFS +
907 RES_QUOTA, 0);
908 if (error)
909 goto out_ipres;
910 } else {
911 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
912 if (error)
913 goto out_ipres;
914 }
915
916 error = gfs2_meta_inode_buffer(ip, &dibh);
917 if (error)
918 goto out_end_trans;
919
920 error = gfs2_dir_add(dir, &dentry->d_name, ip);
921 if (error)
922 goto out_brelse;
923
924 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
925 inc_nlink(&ip->i_inode);
926 ip->i_inode.i_ctime = CURRENT_TIME;
927 gfs2_dinode_out(ip, dibh->b_data);
928 mark_inode_dirty(&ip->i_inode);
929
930out_brelse:
931 brelse(dibh);
932out_end_trans:
933 gfs2_trans_end(sdp);
934out_ipres:
935 if (alloc_required)
936 gfs2_inplace_release(dip);
937out_gunlock_q:
938 if (alloc_required)
939 gfs2_quota_unlock(dip);
940out_alloc:
941 if (alloc_required)
942 gfs2_alloc_put(dip);
943out_gunlock:
944 gfs2_glock_dq(ghs + 1);
945out_child:
946 gfs2_glock_dq(ghs);
947out_parent:
948 gfs2_holder_uninit(ghs);
949 gfs2_holder_uninit(ghs + 1);
950 if (!error) {
951 ihold(inode);
952 d_instantiate(dentry, inode);
953 mark_inode_dirty(inode);
954 }
955 return error;
956}
957
958/*
959 * gfs2_unlink_ok - check to see that a inode is still in a directory
960 * @dip: the directory
961 * @name: the name of the file
962 * @ip: the inode
963 *
964 * Assumes that the lock on (at least) @dip is held.
965 *
966 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
967 */
968
969static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
970 const struct gfs2_inode *ip)
971{
972 int error;
973
974 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
975 return -EPERM;
976
977 if ((dip->i_inode.i_mode & S_ISVTX) &&
978 dip->i_inode.i_uid != current_fsuid() &&
979 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
980 return -EPERM;
981
982 if (IS_APPEND(&dip->i_inode))
983 return -EPERM;
984
985 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
986 if (error)
987 return error;
988
989 error = gfs2_dir_check(&dip->i_inode, name, ip);
990 if (error)
991 return error;
992
993 return 0;
994}
995
996/**
997 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
998 * @dip: The parent directory
999 * @name: The name of the entry in the parent directory
1000 * @bh: The inode buffer for the inode to be removed
1001 * @inode: The inode to be removed
1002 *
1003 * Called with all the locks and in a transaction. This will only be
1004 * called for a directory after it has been checked to ensure it is empty.
1005 *
1006 * Returns: 0 on success, or an error
1007 */
1008
1009static int gfs2_unlink_inode(struct gfs2_inode *dip,
1010 const struct dentry *dentry,
1011 struct buffer_head *bh)
1012{
1013 struct inode *inode = dentry->d_inode;
1014 struct gfs2_inode *ip = GFS2_I(inode);
1015 int error;
1016
1017 error = gfs2_dir_del(dip, dentry);
1018 if (error)
1019 return error;
1020
1021 ip->i_entries = 0;
1022 inode->i_ctime = CURRENT_TIME;
1023 if (S_ISDIR(inode->i_mode))
1024 clear_nlink(inode);
1025 else
1026 drop_nlink(inode);
1027 gfs2_trans_add_bh(ip->i_gl, bh, 1);
1028 gfs2_dinode_out(ip, bh->b_data);
1029 mark_inode_dirty(inode);
1030 if (inode->i_nlink == 0)
1031 gfs2_unlink_di(inode);
1032 return 0;
1033}
1034
1035
1036/**
1037 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1038 * @dir: The inode of the directory containing the inode to unlink
1039 * @dentry: The file itself
1040 *
1041 * This routine uses the type of the inode as a flag to figure out
1042 * whether this is an unlink or an rmdir.
1043 *
1044 * Returns: errno
1045 */
1046
1047static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1048{
1049 struct gfs2_inode *dip = GFS2_I(dir);
1050 struct gfs2_sbd *sdp = GFS2_SB(dir);
1051 struct inode *inode = dentry->d_inode;
1052 struct gfs2_inode *ip = GFS2_I(inode);
1053 struct buffer_head *bh;
1054 struct gfs2_holder ghs[3];
1055 struct gfs2_rgrpd *rgd;
1056 struct gfs2_holder ri_gh;
1057 int error;
1058
1059 error = gfs2_rindex_hold(sdp, &ri_gh);
1060 if (error)
1061 return error;
1062
1063 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1064 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1065
1066 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
1067 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1068
1069
1070 error = gfs2_glock_nq(ghs); /* parent */
1071 if (error)
1072 goto out_parent;
1073
1074 error = gfs2_glock_nq(ghs + 1); /* child */
1075 if (error)
1076 goto out_child;
1077
1078 error = -ENOENT;
1079 if (inode->i_nlink == 0)
1080 goto out_rgrp;
1081
1082 if (S_ISDIR(inode->i_mode)) {
1083 error = -ENOTEMPTY;
1084 if (ip->i_entries > 2 || inode->i_nlink > 2)
1085 goto out_rgrp;
1086 }
1087
1088 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1089 if (error)
1090 goto out_rgrp;
1091
1092 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1093 if (error)
1094 goto out_gunlock;
1095
1096 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1097 if (error)
1098 goto out_gunlock;
1099
1100 error = gfs2_meta_inode_buffer(ip, &bh);
1101 if (error)
1102 goto out_end_trans;
1103
1104 error = gfs2_unlink_inode(dip, dentry, bh);
1105 brelse(bh);
1106
1107out_end_trans:
1108 gfs2_trans_end(sdp);
1109out_gunlock:
1110 gfs2_glock_dq(ghs + 2);
1111out_rgrp:
1112 gfs2_holder_uninit(ghs + 2);
1113 gfs2_glock_dq(ghs + 1);
1114out_child:
1115 gfs2_holder_uninit(ghs + 1);
1116 gfs2_glock_dq(ghs);
1117out_parent:
1118 gfs2_holder_uninit(ghs);
1119 gfs2_glock_dq_uninit(&ri_gh);
1120 return error;
1121}
1122
1123/**
1124 * gfs2_symlink - Create a symlink
1125 * @dir: The directory to create the symlink in
1126 * @dentry: The dentry to put the symlink in
1127 * @symname: The thing which the link points to
1128 *
1129 * Returns: errno
1130 */
1131
1132static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1133 const char *symname)
1134{
1135 struct gfs2_sbd *sdp = GFS2_SB(dir);
1136 unsigned int size;
1137
1138 size = strlen(symname);
1139 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1140 return -ENAMETOOLONG;
1141
1142 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size);
1143}
1144
1145/**
1146 * gfs2_mkdir - Make a directory
1147 * @dir: The parent directory of the new one
1148 * @dentry: The dentry of the new directory
1149 * @mode: The mode of the new directory
1150 *
1151 * Returns: errno
1152 */
1153
1154static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1155{
1156 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0);
1157}
1158
1159/**
1160 * gfs2_mknod - Make a special file
1161 * @dir: The directory in which the special file will reside
1162 * @dentry: The dentry of the special file
1163 * @mode: The mode of the special file
1164 * @dev: The device specification of the special file
1165 *
1166 */
1167
1168static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
1169 dev_t dev)
1170{
1171 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0);
1172}
1173
1174/*
1175 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1176 * @this: move this
1177 * @to: to here
1178 *
1179 * Follow @to back to the root and make sure we don't encounter @this
1180 * Assumes we already hold the rename lock.
1181 *
1182 * Returns: errno
1183 */
1184
1185static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1186{
1187 struct inode *dir = &to->i_inode;
1188 struct super_block *sb = dir->i_sb;
1189 struct inode *tmp;
1190 int error = 0;
1191
1192 igrab(dir);
1193
1194 for (;;) {
1195 if (dir == &this->i_inode) {
1196 error = -EINVAL;
1197 break;
1198 }
1199 if (dir == sb->s_root->d_inode) {
1200 error = 0;
1201 break;
1202 }
1203
1204 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1205 if (IS_ERR(tmp)) {
1206 error = PTR_ERR(tmp);
1207 break;
1208 }
1209
1210 iput(dir);
1211 dir = tmp;
1212 }
1213
1214 iput(dir);
1215
1216 return error;
1217}
1218
1219/**
1220 * gfs2_rename - Rename a file
1221 * @odir: Parent directory of old file name
1222 * @odentry: The old dentry of the file
1223 * @ndir: Parent directory of new file name
1224 * @ndentry: The new dentry of the file
1225 *
1226 * Returns: errno
1227 */
1228
1229static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1230 struct inode *ndir, struct dentry *ndentry)
1231{
1232 struct gfs2_inode *odip = GFS2_I(odir);
1233 struct gfs2_inode *ndip = GFS2_I(ndir);
1234 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1235 struct gfs2_inode *nip = NULL;
1236 struct gfs2_sbd *sdp = GFS2_SB(odir);
1237 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
1238 struct gfs2_rgrpd *nrgd;
1239 unsigned int num_gh;
1240 int dir_rename = 0;
1241 int alloc_required = 0;
1242 unsigned int x;
1243 int error;
1244
1245 if (ndentry->d_inode) {
1246 nip = GFS2_I(ndentry->d_inode);
1247 if (ip == nip)
1248 return 0;
1249 }
1250
1251 error = gfs2_rindex_hold(sdp, &ri_gh);
1252 if (error)
1253 return error;
1254
1255 if (odip != ndip) {
1256 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1257 0, &r_gh);
1258 if (error)
1259 goto out;
1260
1261 if (S_ISDIR(ip->i_inode.i_mode)) {
1262 dir_rename = 1;
1263 /* don't move a dirctory into it's subdir */
1264 error = gfs2_ok_to_move(ip, ndip);
1265 if (error)
1266 goto out_gunlock_r;
1267 }
1268 }
1269
1270 num_gh = 1;
1271 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1272 if (odip != ndip) {
1273 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1274 num_gh++;
1275 }
1276 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1277 num_gh++;
1278
1279 if (nip) {
1280 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1281 num_gh++;
1282 /* grab the resource lock for unlink flag twiddling
1283 * this is the case of the target file already existing
1284 * so we unlink before doing the rename
1285 */
1286 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
1287 if (nrgd)
1288 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1289 }
1290
1291 for (x = 0; x < num_gh; x++) {
1292 error = gfs2_glock_nq(ghs + x);
1293 if (error)
1294 goto out_gunlock;
1295 }
1296
1297 error = -ENOENT;
1298 if (ip->i_inode.i_nlink == 0)
1299 goto out_gunlock;
1300
1301 /* Check out the old directory */
1302
1303 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1304 if (error)
1305 goto out_gunlock;
1306
1307 /* Check out the new directory */
1308
1309 if (nip) {
1310 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1311 if (error)
1312 goto out_gunlock;
1313
1314 if (nip->i_inode.i_nlink == 0) {
1315 error = -EAGAIN;
1316 goto out_gunlock;
1317 }
1318
1319 if (S_ISDIR(nip->i_inode.i_mode)) {
1320 if (nip->i_entries < 2) {
1321 gfs2_consist_inode(nip);
1322 error = -EIO;
1323 goto out_gunlock;
1324 }
1325 if (nip->i_entries > 2) {
1326 error = -ENOTEMPTY;
1327 goto out_gunlock;
1328 }
1329 }
1330 } else {
1331 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1332 if (error)
1333 goto out_gunlock;
1334
1335 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1336 switch (error) {
1337 case -ENOENT:
1338 error = 0;
1339 break;
1340 case 0:
1341 error = -EEXIST;
1342 default:
1343 goto out_gunlock;
1344 };
1345
1346 if (odip != ndip) {
1347 if (!ndip->i_inode.i_nlink) {
1348 error = -ENOENT;
1349 goto out_gunlock;
1350 }
1351 if (ndip->i_entries == (u32)-1) {
1352 error = -EFBIG;
1353 goto out_gunlock;
1354 }
1355 if (S_ISDIR(ip->i_inode.i_mode) &&
1356 ndip->i_inode.i_nlink == (u32)-1) {
1357 error = -EMLINK;
1358 goto out_gunlock;
1359 }
1360 }
1361 }
1362
1363 /* Check out the dir to be renamed */
1364
1365 if (dir_rename) {
1366 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1367 if (error)
1368 goto out_gunlock;
1369 }
1370
1371 if (nip == NULL)
1372 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1373 error = alloc_required;
1374 if (error < 0)
1375 goto out_gunlock;
1376 error = 0;
1377
1378 if (alloc_required) {
1379 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
1380 if (!al) {
1381 error = -ENOMEM;
1382 goto out_gunlock;
1383 }
1384
1385 error = gfs2_quota_lock_check(ndip);
1386 if (error)
1387 goto out_alloc;
1388
1389 al->al_requested = sdp->sd_max_dirres;
1390
1391 error = gfs2_inplace_reserve_ri(ndip);
1392 if (error)
1393 goto out_gunlock_q;
1394
1395 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1396 gfs2_rg_blocks(al) +
1397 4 * RES_DINODE + 4 * RES_LEAF +
1398 RES_STATFS + RES_QUOTA + 4, 0);
1399 if (error)
1400 goto out_ipreserv;
1401 } else {
1402 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1403 5 * RES_LEAF + 4, 0);
1404 if (error)
1405 goto out_gunlock;
1406 }
1407
1408 /* Remove the target file, if it exists */
1409
1410 if (nip) {
1411 struct buffer_head *bh;
1412 error = gfs2_meta_inode_buffer(nip, &bh);
1413 if (error)
1414 goto out_end_trans;
1415 error = gfs2_unlink_inode(ndip, ndentry, bh);
1416 brelse(bh);
1417 }
1418
1419 if (dir_rename) {
1420 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1421 if (error)
1422 goto out_end_trans;
1423 } else {
1424 struct buffer_head *dibh;
1425 error = gfs2_meta_inode_buffer(ip, &dibh);
1426 if (error)
1427 goto out_end_trans;
1428 ip->i_inode.i_ctime = CURRENT_TIME;
1429 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1430 gfs2_dinode_out(ip, dibh->b_data);
1431 brelse(dibh);
1432 }
1433
1434 error = gfs2_dir_del(odip, odentry);
1435 if (error)
1436 goto out_end_trans;
1437
1438 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1439 if (error)
1440 goto out_end_trans;
1441
1442out_end_trans:
1443 gfs2_trans_end(sdp);
1444out_ipreserv:
1445 if (alloc_required)
1446 gfs2_inplace_release(ndip);
1447out_gunlock_q:
1448 if (alloc_required)
1449 gfs2_quota_unlock(ndip);
1450out_alloc:
1451 if (alloc_required)
1452 gfs2_alloc_put(ndip);
1453out_gunlock:
1454 while (x--) {
1455 gfs2_glock_dq(ghs + x);
1456 gfs2_holder_uninit(ghs + x);
1457 }
1458out_gunlock_r:
1459 if (r_gh.gh_gl)
1460 gfs2_glock_dq_uninit(&r_gh);
1461out:
1462 gfs2_glock_dq_uninit(&ri_gh);
1463 return error;
1464}
1465
1466/**
1467 * gfs2_follow_link - Follow a symbolic link
1468 * @dentry: The dentry of the link
1469 * @nd: Data that we pass to vfs_follow_link()
1470 *
1471 * This can handle symlinks of any size.
1472 *
1473 * Returns: 0 on success or error code
1474 */
1475
1476static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1477{
1478 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1479 struct gfs2_holder i_gh;
1480 struct buffer_head *dibh;
1481 unsigned int size;
1482 char *buf;
1483 int error;
1484
1485 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1486 error = gfs2_glock_nq(&i_gh);
1487 if (error) {
1488 gfs2_holder_uninit(&i_gh);
1489 nd_set_link(nd, ERR_PTR(error));
1490 return NULL;
1491 }
1492
1493 size = (unsigned int)i_size_read(&ip->i_inode);
1494 if (size == 0) {
1495 gfs2_consist_inode(ip);
1496 buf = ERR_PTR(-EIO);
1497 goto out;
1498 }
1499
1500 error = gfs2_meta_inode_buffer(ip, &dibh);
1501 if (error) {
1502 buf = ERR_PTR(error);
1503 goto out;
1504 }
1505
1506 buf = kzalloc(size + 1, GFP_NOFS);
1507 if (!buf)
1508 buf = ERR_PTR(-ENOMEM);
1509 else
1510 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1511 brelse(dibh);
1512out:
1513 gfs2_glock_dq_uninit(&i_gh);
1514 nd_set_link(nd, buf);
1515 return NULL;
1516}
1517
1518static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1519{
1520 char *s = nd_get_link(nd);
1521 if (!IS_ERR(s))
1522 kfree(s);
1523}
1524
1525/**
1526 * gfs2_permission -
1527 * @inode: The inode
1528 * @mask: The mask to be tested
1529 * @flags: Indicates whether this is an RCU path walk or not
1530 *
1531 * This may be called from the VFS directly, or from within GFS2 with the
1532 * inode locked, so we look to see if the glock is already locked and only
1533 * lock the glock if its not already been done.
1534 *
1535 * Returns: errno
1536 */
1537
1538int gfs2_permission(struct inode *inode, int mask)
1539{
1540 struct gfs2_inode *ip;
1541 struct gfs2_holder i_gh;
1542 int error;
1543 int unlock = 0;
1544
1545
1546 ip = GFS2_I(inode);
1547 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1548 if (mask & MAY_NOT_BLOCK)
1549 return -ECHILD;
1550 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1551 if (error)
1552 return error;
1553 unlock = 1;
1554 }
1555
1556 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1557 error = -EACCES;
1558 else
1559 error = generic_permission(inode, mask);
1560 if (unlock)
1561 gfs2_glock_dq_uninit(&i_gh);
1562
1563 return error;
1564}
1565
1566static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1567{
1568 struct inode *inode = &ip->i_inode;
1569 struct buffer_head *dibh;
1570 int error;
1571
1572 error = gfs2_meta_inode_buffer(ip, &dibh);
1573 if (error)
1574 return error;
1575
1576 setattr_copy(inode, attr);
1577 mark_inode_dirty(inode);
1578 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1579 gfs2_dinode_out(ip, dibh->b_data);
1580 brelse(dibh);
1581 return 0;
1582}
1583
1584/**
1585 * gfs2_setattr_simple -
1586 * @ip:
1587 * @attr:
1588 *
1589 * Returns: errno
1590 */
1591
1592int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1593{
1594 int error;
1595
1596 if (current->journal_info)
1597 return __gfs2_setattr_simple(ip, attr);
1598
1599 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1600 if (error)
1601 return error;
1602
1603 error = __gfs2_setattr_simple(ip, attr);
1604 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1605 return error;
1606}
1607
1608static int setattr_chown(struct inode *inode, struct iattr *attr)
1609{
1610 struct gfs2_inode *ip = GFS2_I(inode);
1611 struct gfs2_sbd *sdp = GFS2_SB(inode);
1612 u32 ouid, ogid, nuid, ngid;
1613 int error;
1614
1615 ouid = inode->i_uid;
1616 ogid = inode->i_gid;
1617 nuid = attr->ia_uid;
1618 ngid = attr->ia_gid;
1619
1620 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1621 ouid = nuid = NO_QUOTA_CHANGE;
1622 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1623 ogid = ngid = NO_QUOTA_CHANGE;
1624
1625 if (!gfs2_alloc_get(ip))
1626 return -ENOMEM;
1627
1628 error = gfs2_quota_lock(ip, nuid, ngid);
1629 if (error)
1630 goto out_alloc;
1631
1632 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1633 error = gfs2_quota_check(ip, nuid, ngid);
1634 if (error)
1635 goto out_gunlock_q;
1636 }
1637
1638 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1639 if (error)
1640 goto out_gunlock_q;
1641
1642 error = gfs2_setattr_simple(ip, attr);
1643 if (error)
1644 goto out_end_trans;
1645
1646 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1647 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1648 gfs2_quota_change(ip, -blocks, ouid, ogid);
1649 gfs2_quota_change(ip, blocks, nuid, ngid);
1650 }
1651
1652out_end_trans:
1653 gfs2_trans_end(sdp);
1654out_gunlock_q:
1655 gfs2_quota_unlock(ip);
1656out_alloc:
1657 gfs2_alloc_put(ip);
1658 return error;
1659}
1660
1661/**
1662 * gfs2_setattr - Change attributes on an inode
1663 * @dentry: The dentry which is changing
1664 * @attr: The structure describing the change
1665 *
1666 * The VFS layer wants to change one or more of an inodes attributes. Write
1667 * that change out to disk.
1668 *
1669 * Returns: errno
1670 */
1671
1672static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1673{
1674 struct inode *inode = dentry->d_inode;
1675 struct gfs2_inode *ip = GFS2_I(inode);
1676 struct gfs2_holder i_gh;
1677 int error;
1678
1679 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1680 if (error)
1681 return error;
1682
1683 error = -EPERM;
1684 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1685 goto out;
1686
1687 error = inode_change_ok(inode, attr);
1688 if (error)
1689 goto out;
1690
1691 if (attr->ia_valid & ATTR_SIZE)
1692 error = gfs2_setattr_size(inode, attr->ia_size);
1693 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1694 error = setattr_chown(inode, attr);
1695 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1696 error = gfs2_acl_chmod(ip, attr);
1697 else
1698 error = gfs2_setattr_simple(ip, attr);
1699
1700out:
1701 gfs2_glock_dq_uninit(&i_gh);
1702 if (!error)
1703 mark_inode_dirty(inode);
1704 return error;
1705}
1706
1707/**
1708 * gfs2_getattr - Read out an inode's attributes
1709 * @mnt: The vfsmount the inode is being accessed from
1710 * @dentry: The dentry to stat
1711 * @stat: The inode's stats
1712 *
1713 * This may be called from the VFS directly, or from within GFS2 with the
1714 * inode locked, so we look to see if the glock is already locked and only
1715 * lock the glock if its not already been done. Note that its the NFS
1716 * readdirplus operation which causes this to be called (from filldir)
1717 * with the glock already held.
1718 *
1719 * Returns: errno
1720 */
1721
1722static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1723 struct kstat *stat)
1724{
1725 struct inode *inode = dentry->d_inode;
1726 struct gfs2_inode *ip = GFS2_I(inode);
1727 struct gfs2_holder gh;
1728 int error;
1729 int unlock = 0;
1730
1731 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1732 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1733 if (error)
1734 return error;
1735 unlock = 1;
1736 }
1737
1738 generic_fillattr(inode, stat);
1739 if (unlock)
1740 gfs2_glock_dq_uninit(&gh);
1741
1742 return 0;
1743}
1744
1745static int gfs2_setxattr(struct dentry *dentry, const char *name,
1746 const void *data, size_t size, int flags)
1747{
1748 struct inode *inode = dentry->d_inode;
1749 struct gfs2_inode *ip = GFS2_I(inode);
1750 struct gfs2_holder gh;
1751 int ret;
1752
1753 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1754 ret = gfs2_glock_nq(&gh);
1755 if (ret == 0) {
1756 ret = generic_setxattr(dentry, name, data, size, flags);
1757 gfs2_glock_dq(&gh);
1758 }
1759 gfs2_holder_uninit(&gh);
1760 return ret;
1761}
1762
1763static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1764 void *data, size_t size)
1765{
1766 struct inode *inode = dentry->d_inode;
1767 struct gfs2_inode *ip = GFS2_I(inode);
1768 struct gfs2_holder gh;
1769 int ret;
1770
1771 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1772 ret = gfs2_glock_nq(&gh);
1773 if (ret == 0) {
1774 ret = generic_getxattr(dentry, name, data, size);
1775 gfs2_glock_dq(&gh);
1776 }
1777 gfs2_holder_uninit(&gh);
1778 return ret;
1779}
1780
1781static int gfs2_removexattr(struct dentry *dentry, const char *name)
1782{
1783 struct inode *inode = dentry->d_inode;
1784 struct gfs2_inode *ip = GFS2_I(inode);
1785 struct gfs2_holder gh;
1786 int ret;
1787
1788 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1789 ret = gfs2_glock_nq(&gh);
1790 if (ret == 0) {
1791 ret = generic_removexattr(dentry, name);
1792 gfs2_glock_dq(&gh);
1793 }
1794 gfs2_holder_uninit(&gh);
1795 return ret;
1796}
1797
1798static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1799 u64 start, u64 len)
1800{
1801 struct gfs2_inode *ip = GFS2_I(inode);
1802 struct gfs2_holder gh;
1803 int ret;
1804
1805 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1806 if (ret)
1807 return ret;
1808
1809 mutex_lock(&inode->i_mutex);
1810
1811 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1812 if (ret)
1813 goto out;
1814
1815 if (gfs2_is_stuffed(ip)) {
1816 u64 phys = ip->i_no_addr << inode->i_blkbits;
1817 u64 size = i_size_read(inode);
1818 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1819 FIEMAP_EXTENT_DATA_INLINE;
1820 phys += sizeof(struct gfs2_dinode);
1821 phys += start;
1822 if (start + len > size)
1823 len = size - start;
1824 if (start < size)
1825 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1826 len, flags);
1827 if (ret == 1)
1828 ret = 0;
1829 } else {
1830 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1831 gfs2_block_map);
1832 }
1833
1834 gfs2_glock_dq_uninit(&gh);
1835out:
1836 mutex_unlock(&inode->i_mutex);
1837 return ret;
1838}
1839
1840const struct inode_operations gfs2_file_iops = {
1841 .permission = gfs2_permission,
1842 .setattr = gfs2_setattr,
1843 .getattr = gfs2_getattr,
1844 .setxattr = gfs2_setxattr,
1845 .getxattr = gfs2_getxattr,
1846 .listxattr = gfs2_listxattr,
1847 .removexattr = gfs2_removexattr,
1848 .fiemap = gfs2_fiemap,
1849 .get_acl = gfs2_get_acl,
1850};
1851
1852const struct inode_operations gfs2_dir_iops = {
1853 .create = gfs2_create,
1854 .lookup = gfs2_lookup,
1855 .link = gfs2_link,
1856 .unlink = gfs2_unlink,
1857 .symlink = gfs2_symlink,
1858 .mkdir = gfs2_mkdir,
1859 .rmdir = gfs2_unlink,
1860 .mknod = gfs2_mknod,
1861 .rename = gfs2_rename,
1862 .permission = gfs2_permission,
1863 .setattr = gfs2_setattr,
1864 .getattr = gfs2_getattr,
1865 .setxattr = gfs2_setxattr,
1866 .getxattr = gfs2_getxattr,
1867 .listxattr = gfs2_listxattr,
1868 .removexattr = gfs2_removexattr,
1869 .fiemap = gfs2_fiemap,
1870 .get_acl = gfs2_get_acl,
1871};
1872
1873const struct inode_operations gfs2_symlink_iops = {
1874 .readlink = generic_readlink,
1875 .follow_link = gfs2_follow_link,
1876 .put_link = gfs2_put_link,
1877 .permission = gfs2_permission,
1878 .setattr = gfs2_setattr,
1879 .getattr = gfs2_getattr,
1880 .setxattr = gfs2_setxattr,
1881 .getxattr = gfs2_getxattr,
1882 .listxattr = gfs2_listxattr,
1883 .removexattr = gfs2_removexattr,
1884 .fiemap = gfs2_fiemap,
1885 .get_acl = gfs2_get_acl,
1886};
1887
1// 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
43static int iget_test(struct inode *inode, void *opaque)
44{
45 u64 no_addr = *(u64 *)opaque;
46
47 return GFS2_I(inode)->i_no_addr == no_addr;
48}
49
50static int iget_set(struct inode *inode, void *opaque)
51{
52 u64 no_addr = *(u64 *)opaque;
53
54 GFS2_I(inode)->i_no_addr = no_addr;
55 inode->i_ino = no_addr;
56 return 0;
57}
58
59static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
60{
61 struct inode *inode;
62
63repeat:
64 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
65 if (!inode)
66 return inode;
67 if (is_bad_inode(inode)) {
68 iput(inode);
69 goto repeat;
70 }
71 return inode;
72}
73
74/**
75 * gfs2_set_iop - Sets inode operations
76 * @inode: The inode with correct i_mode filled in
77 *
78 * GFS2 lookup code fills in vfs inode contents based on info obtained
79 * from directory entry inside gfs2_inode_lookup().
80 */
81
82static void gfs2_set_iop(struct inode *inode)
83{
84 struct gfs2_sbd *sdp = GFS2_SB(inode);
85 umode_t mode = inode->i_mode;
86
87 if (S_ISREG(mode)) {
88 inode->i_op = &gfs2_file_iops;
89 if (gfs2_localflocks(sdp))
90 inode->i_fop = &gfs2_file_fops_nolock;
91 else
92 inode->i_fop = &gfs2_file_fops;
93 } else if (S_ISDIR(mode)) {
94 inode->i_op = &gfs2_dir_iops;
95 if (gfs2_localflocks(sdp))
96 inode->i_fop = &gfs2_dir_fops_nolock;
97 else
98 inode->i_fop = &gfs2_dir_fops;
99 } else if (S_ISLNK(mode)) {
100 inode->i_op = &gfs2_symlink_iops;
101 } else {
102 inode->i_op = &gfs2_file_iops;
103 init_special_inode(inode, inode->i_mode, inode->i_rdev);
104 }
105}
106
107/**
108 * gfs2_inode_lookup - Lookup an inode
109 * @sb: The super block
110 * @type: The type of the inode
111 * @no_addr: The inode number
112 * @no_formal_ino: The inode generation number
113 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
114 * GFS2_BLKST_FREE to indicate not to verify)
115 *
116 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
117 *
118 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
119 * placeholder because it doesn't otherwise make sense), the on-disk block type
120 * is verified to be @blktype.
121 *
122 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
123 * if it detects that @no_formal_ino doesn't match the actual inode generation
124 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
125 *
126 * Returns: A VFS inode, or an error
127 */
128
129struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
130 u64 no_addr, u64 no_formal_ino,
131 unsigned int blktype)
132{
133 struct inode *inode;
134 struct gfs2_inode *ip;
135 struct gfs2_glock *io_gl = NULL;
136 struct gfs2_holder i_gh;
137 int error;
138
139 gfs2_holder_mark_uninitialized(&i_gh);
140 inode = gfs2_iget(sb, no_addr);
141 if (!inode)
142 return ERR_PTR(-ENOMEM);
143
144 ip = GFS2_I(inode);
145
146 if (inode->i_state & I_NEW) {
147 struct gfs2_sbd *sdp = GFS2_SB(inode);
148
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
150 if (unlikely(error))
151 goto fail;
152 flush_delayed_work(&ip->i_gl->gl_work);
153
154 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
155 if (unlikely(error))
156 goto fail;
157 if (blktype != GFS2_BLKST_UNLINKED)
158 gfs2_cancel_delete_work(io_gl);
159
160 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
161 /*
162 * The GL_SKIP flag indicates to skip reading the inode
163 * block. We read the inode with gfs2_inode_refresh
164 * after possibly checking the block type.
165 */
166 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
167 GL_SKIP, &i_gh);
168 if (error)
169 goto fail;
170
171 error = -ESTALE;
172 if (no_formal_ino &&
173 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
174 goto fail;
175
176 if (blktype != GFS2_BLKST_FREE) {
177 error = gfs2_check_blk_type(sdp, no_addr,
178 blktype);
179 if (error)
180 goto fail;
181 }
182 }
183
184 glock_set_object(ip->i_gl, ip);
185 set_bit(GIF_INVALID, &ip->i_flags);
186 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
187 if (unlikely(error))
188 goto fail;
189 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
190 gfs2_glock_put(io_gl);
191 io_gl = NULL;
192
193 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
194 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
195 inode->i_atime.tv_nsec = 0;
196
197 if (type == DT_UNKNOWN) {
198 /* Inode glock must be locked already */
199 error = gfs2_inode_refresh(GFS2_I(inode));
200 if (error)
201 goto fail;
202 } else {
203 ip->i_no_formal_ino = no_formal_ino;
204 inode->i_mode = DT2IF(type);
205 }
206
207 if (gfs2_holder_initialized(&i_gh))
208 gfs2_glock_dq_uninit(&i_gh);
209
210 gfs2_set_iop(inode);
211 }
212
213 if (no_formal_ino && ip->i_no_formal_ino &&
214 no_formal_ino != ip->i_no_formal_ino) {
215 error = -ESTALE;
216 if (inode->i_state & I_NEW)
217 goto fail;
218 iput(inode);
219 return ERR_PTR(error);
220 }
221
222 if (inode->i_state & I_NEW)
223 unlock_new_inode(inode);
224
225 return inode;
226
227fail:
228 if (io_gl)
229 gfs2_glock_put(io_gl);
230 if (gfs2_holder_initialized(&i_gh))
231 gfs2_glock_dq_uninit(&i_gh);
232 iget_failed(inode);
233 return ERR_PTR(error);
234}
235
236/**
237 * gfs2_lookup_by_inum - look up an inode by inode number
238 * @sdp: The super block
239 * @no_addr: The inode number
240 * @no_formal_ino: The inode generation number (0 for any)
241 * @blktype: Requested block type (see gfs2_inode_lookup)
242 */
243struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
244 u64 no_formal_ino, unsigned int blktype)
245{
246 struct super_block *sb = sdp->sd_vfs;
247 struct inode *inode;
248 int error;
249
250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
251 blktype);
252 if (IS_ERR(inode))
253 return inode;
254
255 if (no_formal_ino) {
256 error = -EIO;
257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
258 goto fail_iput;
259 }
260 return inode;
261
262fail_iput:
263 iput(inode);
264 return ERR_PTR(error);
265}
266
267
268struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
269{
270 struct qstr qstr;
271 struct inode *inode;
272 gfs2_str2qstr(&qstr, name);
273 inode = gfs2_lookupi(dip, &qstr, 1);
274 /* gfs2_lookupi has inconsistent callers: vfs
275 * related routines expect NULL for no entry found,
276 * gfs2_lookup_simple callers expect ENOENT
277 * and do not check for NULL.
278 */
279 if (inode == NULL)
280 return ERR_PTR(-ENOENT);
281 else
282 return inode;
283}
284
285
286/**
287 * gfs2_lookupi - Look up a filename in a directory and return its inode
288 * @dir: The inode of the directory containing the inode to look-up
289 * @name: The name of the inode to look for
290 * @is_root: If 1, ignore the caller's permissions
291 *
292 * This can be called via the VFS filldir function when NFS is doing
293 * a readdirplus and the inode which its intending to stat isn't
294 * already in cache. In this case we must not take the directory glock
295 * again, since the readdir call will have already taken that lock.
296 *
297 * Returns: errno
298 */
299
300struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
301 int is_root)
302{
303 struct super_block *sb = dir->i_sb;
304 struct gfs2_inode *dip = GFS2_I(dir);
305 struct gfs2_holder d_gh;
306 int error = 0;
307 struct inode *inode = NULL;
308
309 gfs2_holder_mark_uninitialized(&d_gh);
310 if (!name->len || name->len > GFS2_FNAMESIZE)
311 return ERR_PTR(-ENAMETOOLONG);
312
313 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
314 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
315 dir == d_inode(sb->s_root))) {
316 igrab(dir);
317 return dir;
318 }
319
320 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
321 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
322 if (error)
323 return ERR_PTR(error);
324 }
325
326 if (!is_root) {
327 error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
328 if (error)
329 goto out;
330 }
331
332 inode = gfs2_dir_search(dir, name, false);
333 if (IS_ERR(inode))
334 error = PTR_ERR(inode);
335out:
336 if (gfs2_holder_initialized(&d_gh))
337 gfs2_glock_dq_uninit(&d_gh);
338 if (error == -ENOENT)
339 return NULL;
340 return inode ? inode : ERR_PTR(error);
341}
342
343/**
344 * create_ok - OK to create a new on-disk inode here?
345 * @dip: Directory in which dinode is to be created
346 * @name: Name of new dinode
347 * @mode:
348 *
349 * Returns: errno
350 */
351
352static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
353 umode_t mode)
354{
355 int error;
356
357 error = gfs2_permission(&init_user_ns, &dip->i_inode,
358 MAY_WRITE | MAY_EXEC);
359 if (error)
360 return error;
361
362 /* Don't create entries in an unlinked directory */
363 if (!dip->i_inode.i_nlink)
364 return -ENOENT;
365
366 if (dip->i_entries == (u32)-1)
367 return -EFBIG;
368 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
369 return -EMLINK;
370
371 return 0;
372}
373
374static void munge_mode_uid_gid(const struct gfs2_inode *dip,
375 struct inode *inode)
376{
377 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
378 (dip->i_inode.i_mode & S_ISUID) &&
379 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
380 if (S_ISDIR(inode->i_mode))
381 inode->i_mode |= S_ISUID;
382 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
383 inode->i_mode &= ~07111;
384 inode->i_uid = dip->i_inode.i_uid;
385 } else
386 inode->i_uid = current_fsuid();
387
388 if (dip->i_inode.i_mode & S_ISGID) {
389 if (S_ISDIR(inode->i_mode))
390 inode->i_mode |= S_ISGID;
391 inode->i_gid = dip->i_inode.i_gid;
392 } else
393 inode->i_gid = current_fsgid();
394}
395
396static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
397{
398 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
399 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
400 int error;
401
402 error = gfs2_quota_lock_check(ip, &ap);
403 if (error)
404 goto out;
405
406 error = gfs2_inplace_reserve(ip, &ap);
407 if (error)
408 goto out_quota;
409
410 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
411 if (error)
412 goto out_ipreserv;
413
414 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
415 ip->i_no_formal_ino = ip->i_generation;
416 ip->i_inode.i_ino = ip->i_no_addr;
417 ip->i_goal = ip->i_no_addr;
418
419 gfs2_trans_end(sdp);
420
421out_ipreserv:
422 gfs2_inplace_release(ip);
423out_quota:
424 gfs2_quota_unlock(ip);
425out:
426 return error;
427}
428
429static void gfs2_init_dir(struct buffer_head *dibh,
430 const struct gfs2_inode *parent)
431{
432 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
433 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
434
435 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
436 dent->de_inum = di->di_num; /* already GFS2 endian */
437 dent->de_type = cpu_to_be16(DT_DIR);
438
439 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
440 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
441 gfs2_inum_out(parent, dent);
442 dent->de_type = cpu_to_be16(DT_DIR);
443
444}
445
446/**
447 * gfs2_init_xattr - Initialise an xattr block for a new inode
448 * @ip: The inode in question
449 *
450 * This sets up an empty xattr block for a new inode, ready to
451 * take any ACLs, LSM xattrs, etc.
452 */
453
454static void gfs2_init_xattr(struct gfs2_inode *ip)
455{
456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
457 struct buffer_head *bh;
458 struct gfs2_ea_header *ea;
459
460 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
461 gfs2_trans_add_meta(ip->i_gl, bh);
462 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
463 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
464
465 ea = GFS2_EA_BH2FIRST(bh);
466 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
467 ea->ea_type = GFS2_EATYPE_UNUSED;
468 ea->ea_flags = GFS2_EAFLAG_LAST;
469
470 brelse(bh);
471}
472
473/**
474 * init_dinode - Fill in a new dinode structure
475 * @dip: The directory this inode is being created in
476 * @ip: The inode
477 * @symname: The symlink destination (if a symlink)
478 *
479 */
480
481static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
482 const char *symname)
483{
484 struct gfs2_dinode *di;
485 struct buffer_head *dibh;
486
487 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
488 gfs2_trans_add_meta(ip->i_gl, dibh);
489 di = (struct gfs2_dinode *)dibh->b_data;
490 gfs2_dinode_out(ip, di);
491
492 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
493 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
494 di->__pad1 = 0;
495 di->__pad2 = 0;
496 di->__pad3 = 0;
497 memset(&di->__pad4, 0, sizeof(di->__pad4));
498 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
499 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
500
501 switch(ip->i_inode.i_mode & S_IFMT) {
502 case S_IFDIR:
503 gfs2_init_dir(dibh, dip);
504 break;
505 case S_IFLNK:
506 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
507 break;
508 }
509
510 set_buffer_uptodate(dibh);
511 brelse(dibh);
512}
513
514/**
515 * gfs2_trans_da_blks - Calculate number of blocks to link inode
516 * @dip: The directory we are linking into
517 * @da: The dir add information
518 * @nr_inodes: The number of inodes involved
519 *
520 * This calculate the number of blocks we need to reserve in a
521 * transaction to link @nr_inodes into a directory. In most cases
522 * @nr_inodes will be 2 (the directory plus the inode being linked in)
523 * but in case of rename, 4 may be required.
524 *
525 * Returns: Number of blocks
526 */
527
528static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
529 const struct gfs2_diradd *da,
530 unsigned nr_inodes)
531{
532 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
533 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
534}
535
536static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
537 struct gfs2_inode *ip, struct gfs2_diradd *da)
538{
539 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
540 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
541 int error;
542
543 if (da->nr_blocks) {
544 error = gfs2_quota_lock_check(dip, &ap);
545 if (error)
546 goto fail_quota_locks;
547
548 error = gfs2_inplace_reserve(dip, &ap);
549 if (error)
550 goto fail_quota_locks;
551
552 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
553 if (error)
554 goto fail_ipreserv;
555 } else {
556 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
557 if (error)
558 goto fail_quota_locks;
559 }
560
561 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
562
563 gfs2_trans_end(sdp);
564fail_ipreserv:
565 gfs2_inplace_release(dip);
566fail_quota_locks:
567 gfs2_quota_unlock(dip);
568 return error;
569}
570
571static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
572 void *fs_info)
573{
574 const struct xattr *xattr;
575 int err = 0;
576
577 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
578 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
579 xattr->value_len, 0,
580 GFS2_EATYPE_SECURITY);
581 if (err < 0)
582 break;
583 }
584 return err;
585}
586
587/**
588 * gfs2_create_inode - Create a new inode
589 * @dir: The parent directory
590 * @dentry: The new dentry
591 * @file: If non-NULL, the file which is being opened
592 * @mode: The permissions on the new inode
593 * @dev: For device nodes, this is the device number
594 * @symname: For symlinks, this is the link destination
595 * @size: The initial size of the inode (ignored for directories)
596 * @excl: Force fail if inode exists
597 *
598 * Returns: 0 on success, or error code
599 */
600
601static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
602 struct file *file,
603 umode_t mode, dev_t dev, const char *symname,
604 unsigned int size, int excl)
605{
606 const struct qstr *name = &dentry->d_name;
607 struct posix_acl *default_acl, *acl;
608 struct gfs2_holder ghs[2];
609 struct inode *inode = NULL;
610 struct gfs2_inode *dip = GFS2_I(dir), *ip;
611 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
612 struct gfs2_glock *io_gl;
613 int error, free_vfs_inode = 1;
614 u32 aflags = 0;
615 unsigned blocks = 1;
616 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
617
618 if (!name->len || name->len > GFS2_FNAMESIZE)
619 return -ENAMETOOLONG;
620
621 error = gfs2_qa_get(dip);
622 if (error)
623 return error;
624
625 error = gfs2_rindex_update(sdp);
626 if (error)
627 goto fail;
628
629 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
630 if (error)
631 goto fail;
632 gfs2_holder_mark_uninitialized(ghs + 1);
633
634 error = create_ok(dip, name, mode);
635 if (error)
636 goto fail_gunlock;
637
638 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
639 error = PTR_ERR(inode);
640 if (!IS_ERR(inode)) {
641 if (S_ISDIR(inode->i_mode)) {
642 iput(inode);
643 inode = ERR_PTR(-EISDIR);
644 goto fail_gunlock;
645 }
646 d_instantiate(dentry, inode);
647 error = 0;
648 if (file) {
649 if (S_ISREG(inode->i_mode))
650 error = finish_open(file, dentry, gfs2_open_common);
651 else
652 error = finish_no_open(file, NULL);
653 }
654 gfs2_glock_dq_uninit(ghs);
655 goto fail;
656 } else if (error != -ENOENT) {
657 goto fail_gunlock;
658 }
659
660 error = gfs2_diradd_alloc_required(dir, name, &da);
661 if (error < 0)
662 goto fail_gunlock;
663
664 inode = new_inode(sdp->sd_vfs);
665 error = -ENOMEM;
666 if (!inode)
667 goto fail_gunlock;
668
669 error = posix_acl_create(dir, &mode, &default_acl, &acl);
670 if (error)
671 goto fail_gunlock;
672
673 ip = GFS2_I(inode);
674 error = gfs2_qa_get(ip);
675 if (error)
676 goto fail_free_acls;
677
678 inode->i_mode = mode;
679 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
680 inode->i_rdev = dev;
681 inode->i_size = size;
682 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
683 munge_mode_uid_gid(dip, inode);
684 check_and_update_goal(dip);
685 ip->i_goal = dip->i_goal;
686 ip->i_diskflags = 0;
687 ip->i_eattr = 0;
688 ip->i_height = 0;
689 ip->i_depth = 0;
690 ip->i_entries = 0;
691 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
692
693 switch(mode & S_IFMT) {
694 case S_IFREG:
695 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
696 gfs2_tune_get(sdp, gt_new_files_jdata))
697 ip->i_diskflags |= GFS2_DIF_JDATA;
698 gfs2_set_aops(inode);
699 break;
700 case S_IFDIR:
701 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
702 ip->i_diskflags |= GFS2_DIF_JDATA;
703 ip->i_entries = 2;
704 break;
705 }
706
707 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
708 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
709 ip->i_diskflags |= GFS2_DIF_SYSTEM;
710
711 gfs2_set_inode_flags(inode);
712
713 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
714 (dip->i_diskflags & GFS2_DIF_TOPDIR))
715 aflags |= GFS2_AF_ORLOV;
716
717 if (default_acl || acl)
718 blocks++;
719
720 error = alloc_dinode(ip, aflags, &blocks);
721 if (error)
722 goto fail_free_inode;
723
724 gfs2_set_inode_blocks(inode, blocks);
725
726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
727 if (error)
728 goto fail_free_inode;
729 flush_delayed_work(&ip->i_gl->gl_work);
730 glock_set_object(ip->i_gl, ip);
731
732 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
733 if (error)
734 goto fail_free_inode;
735 gfs2_cancel_delete_work(io_gl);
736 glock_set_object(io_gl, ip);
737
738 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
739 if (error)
740 goto fail_gunlock2;
741
742 error = gfs2_trans_begin(sdp, blocks, 0);
743 if (error)
744 goto fail_gunlock2;
745
746 if (blocks > 1) {
747 ip->i_eattr = ip->i_no_addr + 1;
748 gfs2_init_xattr(ip);
749 }
750 init_dinode(dip, ip, symname);
751 gfs2_trans_end(sdp);
752
753 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
754 if (error)
755 goto fail_gunlock2;
756
757 gfs2_set_iop(inode);
758 insert_inode_hash(inode);
759
760 free_vfs_inode = 0; /* After this point, the inode is no longer
761 considered free. Any failures need to undo
762 the gfs2 structures. */
763 if (default_acl) {
764 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
765 if (error)
766 goto fail_gunlock3;
767 posix_acl_release(default_acl);
768 default_acl = NULL;
769 }
770 if (acl) {
771 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
772 if (error)
773 goto fail_gunlock3;
774 posix_acl_release(acl);
775 acl = NULL;
776 }
777
778 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
779 &gfs2_initxattrs, NULL);
780 if (error)
781 goto fail_gunlock3;
782
783 error = link_dinode(dip, name, ip, &da);
784 if (error)
785 goto fail_gunlock3;
786
787 mark_inode_dirty(inode);
788 d_instantiate(dentry, inode);
789 /* After instantiate, errors should result in evict which will destroy
790 * both inode and iopen glocks properly. */
791 if (file) {
792 file->f_mode |= FMODE_CREATED;
793 error = finish_open(file, dentry, gfs2_open_common);
794 }
795 gfs2_glock_dq_uninit(ghs);
796 gfs2_qa_put(ip);
797 gfs2_glock_dq_uninit(ghs + 1);
798 gfs2_glock_put(io_gl);
799 gfs2_qa_put(dip);
800 return error;
801
802fail_gunlock3:
803 glock_clear_object(io_gl, ip);
804 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
805fail_gunlock2:
806 glock_clear_object(io_gl, ip);
807 gfs2_glock_put(io_gl);
808fail_free_inode:
809 if (ip->i_gl) {
810 glock_clear_object(ip->i_gl, ip);
811 if (free_vfs_inode) /* else evict will do the put for us */
812 gfs2_glock_put(ip->i_gl);
813 }
814 gfs2_rs_delete(ip, NULL);
815 gfs2_qa_put(ip);
816fail_free_acls:
817 posix_acl_release(default_acl);
818 posix_acl_release(acl);
819fail_gunlock:
820 gfs2_dir_no_add(&da);
821 gfs2_glock_dq_uninit(ghs);
822 if (!IS_ERR_OR_NULL(inode)) {
823 clear_nlink(inode);
824 if (!free_vfs_inode)
825 mark_inode_dirty(inode);
826 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
827 &GFS2_I(inode)->i_flags);
828 iput(inode);
829 }
830 if (gfs2_holder_initialized(ghs + 1))
831 gfs2_glock_dq_uninit(ghs + 1);
832fail:
833 gfs2_qa_put(dip);
834 return error;
835}
836
837/**
838 * gfs2_create - Create a file
839 * @mnt_userns: User namespace of the mount the inode was found from
840 * @dir: The directory in which to create the file
841 * @dentry: The dentry of the new file
842 * @mode: The mode of the new file
843 * @excl: Force fail if inode exists
844 *
845 * Returns: errno
846 */
847
848static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
849 struct dentry *dentry, umode_t mode, bool excl)
850{
851 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
852}
853
854/**
855 * __gfs2_lookup - Look up a filename in a directory and return its inode
856 * @dir: The directory inode
857 * @dentry: The dentry of the new inode
858 * @file: File to be opened
859 *
860 *
861 * Returns: errno
862 */
863
864static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
865 struct file *file)
866{
867 struct inode *inode;
868 struct dentry *d;
869 struct gfs2_holder gh;
870 struct gfs2_glock *gl;
871 int error;
872
873 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
874 if (inode == NULL) {
875 d_add(dentry, NULL);
876 return NULL;
877 }
878 if (IS_ERR(inode))
879 return ERR_CAST(inode);
880
881 gl = GFS2_I(inode)->i_gl;
882 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
883 if (error) {
884 iput(inode);
885 return ERR_PTR(error);
886 }
887
888 d = d_splice_alias(inode, dentry);
889 if (IS_ERR(d)) {
890 gfs2_glock_dq_uninit(&gh);
891 return d;
892 }
893 if (file && S_ISREG(inode->i_mode))
894 error = finish_open(file, dentry, gfs2_open_common);
895
896 gfs2_glock_dq_uninit(&gh);
897 if (error) {
898 dput(d);
899 return ERR_PTR(error);
900 }
901 return d;
902}
903
904static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
905 unsigned flags)
906{
907 return __gfs2_lookup(dir, dentry, NULL);
908}
909
910/**
911 * gfs2_link - Link to a file
912 * @old_dentry: The inode to link
913 * @dir: Add link to this directory
914 * @dentry: The name of the link
915 *
916 * Link the inode in "old_dentry" into the directory "dir" with the
917 * name in "dentry".
918 *
919 * Returns: errno
920 */
921
922static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
923 struct dentry *dentry)
924{
925 struct gfs2_inode *dip = GFS2_I(dir);
926 struct gfs2_sbd *sdp = GFS2_SB(dir);
927 struct inode *inode = d_inode(old_dentry);
928 struct gfs2_inode *ip = GFS2_I(inode);
929 struct gfs2_holder ghs[2];
930 struct buffer_head *dibh;
931 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
932 int error;
933
934 if (S_ISDIR(inode->i_mode))
935 return -EPERM;
936
937 error = gfs2_qa_get(dip);
938 if (error)
939 return error;
940
941 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
942 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
943
944 error = gfs2_glock_nq(ghs); /* parent */
945 if (error)
946 goto out_parent;
947
948 error = gfs2_glock_nq(ghs + 1); /* child */
949 if (error)
950 goto out_child;
951
952 error = -ENOENT;
953 if (inode->i_nlink == 0)
954 goto out_gunlock;
955
956 error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
957 if (error)
958 goto out_gunlock;
959
960 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
961 switch (error) {
962 case -ENOENT:
963 break;
964 case 0:
965 error = -EEXIST;
966 goto out_gunlock;
967 default:
968 goto out_gunlock;
969 }
970
971 error = -EINVAL;
972 if (!dip->i_inode.i_nlink)
973 goto out_gunlock;
974 error = -EFBIG;
975 if (dip->i_entries == (u32)-1)
976 goto out_gunlock;
977 error = -EPERM;
978 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
979 goto out_gunlock;
980 error = -EINVAL;
981 if (!ip->i_inode.i_nlink)
982 goto out_gunlock;
983 error = -EMLINK;
984 if (ip->i_inode.i_nlink == (u32)-1)
985 goto out_gunlock;
986
987 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
988 if (error < 0)
989 goto out_gunlock;
990
991 if (da.nr_blocks) {
992 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
993 error = gfs2_quota_lock_check(dip, &ap);
994 if (error)
995 goto out_gunlock;
996
997 error = gfs2_inplace_reserve(dip, &ap);
998 if (error)
999 goto out_gunlock_q;
1000
1001 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1002 if (error)
1003 goto out_ipres;
1004 } else {
1005 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1006 if (error)
1007 goto out_ipres;
1008 }
1009
1010 error = gfs2_meta_inode_buffer(ip, &dibh);
1011 if (error)
1012 goto out_end_trans;
1013
1014 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1015 if (error)
1016 goto out_brelse;
1017
1018 gfs2_trans_add_meta(ip->i_gl, dibh);
1019 inc_nlink(&ip->i_inode);
1020 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1021 ihold(inode);
1022 d_instantiate(dentry, inode);
1023 mark_inode_dirty(inode);
1024
1025out_brelse:
1026 brelse(dibh);
1027out_end_trans:
1028 gfs2_trans_end(sdp);
1029out_ipres:
1030 if (da.nr_blocks)
1031 gfs2_inplace_release(dip);
1032out_gunlock_q:
1033 if (da.nr_blocks)
1034 gfs2_quota_unlock(dip);
1035out_gunlock:
1036 gfs2_dir_no_add(&da);
1037 gfs2_glock_dq(ghs + 1);
1038out_child:
1039 gfs2_glock_dq(ghs);
1040out_parent:
1041 gfs2_qa_put(dip);
1042 gfs2_holder_uninit(ghs);
1043 gfs2_holder_uninit(ghs + 1);
1044 return error;
1045}
1046
1047/*
1048 * gfs2_unlink_ok - check to see that a inode is still in a directory
1049 * @dip: the directory
1050 * @name: the name of the file
1051 * @ip: the inode
1052 *
1053 * Assumes that the lock on (at least) @dip is held.
1054 *
1055 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1056 */
1057
1058static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1059 const struct gfs2_inode *ip)
1060{
1061 int error;
1062
1063 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1064 return -EPERM;
1065
1066 if ((dip->i_inode.i_mode & S_ISVTX) &&
1067 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1068 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1069 return -EPERM;
1070
1071 if (IS_APPEND(&dip->i_inode))
1072 return -EPERM;
1073
1074 error = gfs2_permission(&init_user_ns, &dip->i_inode,
1075 MAY_WRITE | MAY_EXEC);
1076 if (error)
1077 return error;
1078
1079 return gfs2_dir_check(&dip->i_inode, name, ip);
1080}
1081
1082/**
1083 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1084 * @dip: The parent directory
1085 * @dentry: The dentry to unlink
1086 *
1087 * Called with all the locks and in a transaction. This will only be
1088 * called for a directory after it has been checked to ensure it is empty.
1089 *
1090 * Returns: 0 on success, or an error
1091 */
1092
1093static int gfs2_unlink_inode(struct gfs2_inode *dip,
1094 const struct dentry *dentry)
1095{
1096 struct inode *inode = d_inode(dentry);
1097 struct gfs2_inode *ip = GFS2_I(inode);
1098 int error;
1099
1100 error = gfs2_dir_del(dip, dentry);
1101 if (error)
1102 return error;
1103
1104 ip->i_entries = 0;
1105 inode->i_ctime = current_time(inode);
1106 if (S_ISDIR(inode->i_mode))
1107 clear_nlink(inode);
1108 else
1109 drop_nlink(inode);
1110 mark_inode_dirty(inode);
1111 if (inode->i_nlink == 0)
1112 gfs2_unlink_di(inode);
1113 return 0;
1114}
1115
1116
1117/**
1118 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1119 * @dir: The inode of the directory containing the inode to unlink
1120 * @dentry: The file itself
1121 *
1122 * This routine uses the type of the inode as a flag to figure out
1123 * whether this is an unlink or an rmdir.
1124 *
1125 * Returns: errno
1126 */
1127
1128static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1129{
1130 struct gfs2_inode *dip = GFS2_I(dir);
1131 struct gfs2_sbd *sdp = GFS2_SB(dir);
1132 struct inode *inode = d_inode(dentry);
1133 struct gfs2_inode *ip = GFS2_I(inode);
1134 struct gfs2_holder ghs[3];
1135 struct gfs2_rgrpd *rgd;
1136 int error;
1137
1138 error = gfs2_rindex_update(sdp);
1139 if (error)
1140 return error;
1141
1142 error = -EROFS;
1143
1144 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1145 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1146
1147 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1148 if (!rgd)
1149 goto out_inodes;
1150
1151 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
1152
1153
1154 error = gfs2_glock_nq(ghs); /* parent */
1155 if (error)
1156 goto out_parent;
1157
1158 error = gfs2_glock_nq(ghs + 1); /* child */
1159 if (error)
1160 goto out_child;
1161
1162 error = -ENOENT;
1163 if (inode->i_nlink == 0)
1164 goto out_rgrp;
1165
1166 if (S_ISDIR(inode->i_mode)) {
1167 error = -ENOTEMPTY;
1168 if (ip->i_entries > 2 || inode->i_nlink > 2)
1169 goto out_rgrp;
1170 }
1171
1172 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1173 if (error)
1174 goto out_rgrp;
1175
1176 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1177 if (error)
1178 goto out_gunlock;
1179
1180 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1181 if (error)
1182 goto out_gunlock;
1183
1184 error = gfs2_unlink_inode(dip, dentry);
1185 gfs2_trans_end(sdp);
1186
1187out_gunlock:
1188 gfs2_glock_dq(ghs + 2);
1189out_rgrp:
1190 gfs2_glock_dq(ghs + 1);
1191out_child:
1192 gfs2_glock_dq(ghs);
1193out_parent:
1194 gfs2_holder_uninit(ghs + 2);
1195out_inodes:
1196 gfs2_holder_uninit(ghs + 1);
1197 gfs2_holder_uninit(ghs);
1198 return error;
1199}
1200
1201/**
1202 * gfs2_symlink - Create a symlink
1203 * @mnt_userns: User namespace of the mount the inode was found from
1204 * @dir: The directory to create the symlink in
1205 * @dentry: The dentry to put the symlink in
1206 * @symname: The thing which the link points to
1207 *
1208 * Returns: errno
1209 */
1210
1211static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
1212 struct dentry *dentry, const char *symname)
1213{
1214 unsigned int size;
1215
1216 size = strlen(symname);
1217 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1218 return -ENAMETOOLONG;
1219
1220 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1221}
1222
1223/**
1224 * gfs2_mkdir - Make a directory
1225 * @mnt_userns: User namespace of the mount the inode was found from
1226 * @dir: The parent directory of the new one
1227 * @dentry: The dentry of the new directory
1228 * @mode: The mode of the new directory
1229 *
1230 * Returns: errno
1231 */
1232
1233static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
1234 struct dentry *dentry, umode_t mode)
1235{
1236 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1237 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1238}
1239
1240/**
1241 * gfs2_mknod - Make a special file
1242 * @mnt_userns: User namespace of the mount the inode was found from
1243 * @dir: The directory in which the special file will reside
1244 * @dentry: The dentry of the special file
1245 * @mode: The mode of the special file
1246 * @dev: The device specification of the special file
1247 *
1248 */
1249
1250static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
1251 struct dentry *dentry, umode_t mode, dev_t dev)
1252{
1253 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1254}
1255
1256/**
1257 * gfs2_atomic_open - Atomically open a file
1258 * @dir: The directory
1259 * @dentry: The proposed new entry
1260 * @file: The proposed new struct file
1261 * @flags: open flags
1262 * @mode: File mode
1263 *
1264 * Returns: error code or 0 for success
1265 */
1266
1267static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1268 struct file *file, unsigned flags,
1269 umode_t mode)
1270{
1271 struct dentry *d;
1272 bool excl = !!(flags & O_EXCL);
1273
1274 if (!d_in_lookup(dentry))
1275 goto skip_lookup;
1276
1277 d = __gfs2_lookup(dir, dentry, file);
1278 if (IS_ERR(d))
1279 return PTR_ERR(d);
1280 if (d != NULL)
1281 dentry = d;
1282 if (d_really_is_positive(dentry)) {
1283 if (!(file->f_mode & FMODE_OPENED))
1284 return finish_no_open(file, d);
1285 dput(d);
1286 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1287 }
1288
1289 BUG_ON(d != NULL);
1290
1291skip_lookup:
1292 if (!(flags & O_CREAT))
1293 return -ENOENT;
1294
1295 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1296}
1297
1298/*
1299 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1300 * @this: move this
1301 * @to: to here
1302 *
1303 * Follow @to back to the root and make sure we don't encounter @this
1304 * Assumes we already hold the rename lock.
1305 *
1306 * Returns: errno
1307 */
1308
1309static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1310{
1311 struct inode *dir = &to->i_inode;
1312 struct super_block *sb = dir->i_sb;
1313 struct inode *tmp;
1314 int error = 0;
1315
1316 igrab(dir);
1317
1318 for (;;) {
1319 if (dir == &this->i_inode) {
1320 error = -EINVAL;
1321 break;
1322 }
1323 if (dir == d_inode(sb->s_root)) {
1324 error = 0;
1325 break;
1326 }
1327
1328 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1329 if (!tmp) {
1330 error = -ENOENT;
1331 break;
1332 }
1333 if (IS_ERR(tmp)) {
1334 error = PTR_ERR(tmp);
1335 break;
1336 }
1337
1338 iput(dir);
1339 dir = tmp;
1340 }
1341
1342 iput(dir);
1343
1344 return error;
1345}
1346
1347/**
1348 * update_moved_ino - Update an inode that's being moved
1349 * @ip: The inode being moved
1350 * @ndip: The parent directory of the new filename
1351 * @dir_rename: True of ip is a directory
1352 *
1353 * Returns: errno
1354 */
1355
1356static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1357 int dir_rename)
1358{
1359 if (dir_rename)
1360 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1361
1362 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1363 mark_inode_dirty_sync(&ip->i_inode);
1364 return 0;
1365}
1366
1367
1368/**
1369 * gfs2_rename - Rename a file
1370 * @odir: Parent directory of old file name
1371 * @odentry: The old dentry of the file
1372 * @ndir: Parent directory of new file name
1373 * @ndentry: The new dentry of the file
1374 *
1375 * Returns: errno
1376 */
1377
1378static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1379 struct inode *ndir, struct dentry *ndentry)
1380{
1381 struct gfs2_inode *odip = GFS2_I(odir);
1382 struct gfs2_inode *ndip = GFS2_I(ndir);
1383 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1384 struct gfs2_inode *nip = NULL;
1385 struct gfs2_sbd *sdp = GFS2_SB(odir);
1386 struct gfs2_holder ghs[4], r_gh, rd_gh;
1387 struct gfs2_rgrpd *nrgd;
1388 unsigned int num_gh;
1389 int dir_rename = 0;
1390 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1391 unsigned int x;
1392 int error;
1393
1394 gfs2_holder_mark_uninitialized(&r_gh);
1395 gfs2_holder_mark_uninitialized(&rd_gh);
1396 if (d_really_is_positive(ndentry)) {
1397 nip = GFS2_I(d_inode(ndentry));
1398 if (ip == nip)
1399 return 0;
1400 }
1401
1402 error = gfs2_rindex_update(sdp);
1403 if (error)
1404 return error;
1405
1406 error = gfs2_qa_get(ndip);
1407 if (error)
1408 return error;
1409
1410 if (odip != ndip) {
1411 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1412 0, &r_gh);
1413 if (error)
1414 goto out;
1415
1416 if (S_ISDIR(ip->i_inode.i_mode)) {
1417 dir_rename = 1;
1418 /* don't move a directory into its subdir */
1419 error = gfs2_ok_to_move(ip, ndip);
1420 if (error)
1421 goto out_gunlock_r;
1422 }
1423 }
1424
1425 num_gh = 1;
1426 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1427 if (odip != ndip) {
1428 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1429 ghs + num_gh);
1430 num_gh++;
1431 }
1432 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1433 num_gh++;
1434
1435 if (nip) {
1436 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1437 ghs + num_gh);
1438 num_gh++;
1439 }
1440
1441 for (x = 0; x < num_gh; x++) {
1442 error = gfs2_glock_nq(ghs + x);
1443 if (error)
1444 goto out_gunlock;
1445 }
1446 error = gfs2_glock_async_wait(num_gh, ghs);
1447 if (error)
1448 goto out_gunlock;
1449
1450 if (nip) {
1451 /* Grab the resource group glock for unlink flag twiddling.
1452 * This is the case where the target dinode already exists
1453 * so we unlink before doing the rename.
1454 */
1455 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1456 if (!nrgd) {
1457 error = -ENOENT;
1458 goto out_gunlock;
1459 }
1460 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1461 LM_FLAG_NODE_SCOPE, &rd_gh);
1462 if (error)
1463 goto out_gunlock;
1464 }
1465
1466 error = -ENOENT;
1467 if (ip->i_inode.i_nlink == 0)
1468 goto out_gunlock;
1469
1470 /* Check out the old directory */
1471
1472 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1473 if (error)
1474 goto out_gunlock;
1475
1476 /* Check out the new directory */
1477
1478 if (nip) {
1479 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1480 if (error)
1481 goto out_gunlock;
1482
1483 if (nip->i_inode.i_nlink == 0) {
1484 error = -EAGAIN;
1485 goto out_gunlock;
1486 }
1487
1488 if (S_ISDIR(nip->i_inode.i_mode)) {
1489 if (nip->i_entries < 2) {
1490 gfs2_consist_inode(nip);
1491 error = -EIO;
1492 goto out_gunlock;
1493 }
1494 if (nip->i_entries > 2) {
1495 error = -ENOTEMPTY;
1496 goto out_gunlock;
1497 }
1498 }
1499 } else {
1500 error = gfs2_permission(&init_user_ns, ndir,
1501 MAY_WRITE | MAY_EXEC);
1502 if (error)
1503 goto out_gunlock;
1504
1505 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1506 switch (error) {
1507 case -ENOENT:
1508 error = 0;
1509 break;
1510 case 0:
1511 error = -EEXIST;
1512 goto out_gunlock;
1513 default:
1514 goto out_gunlock;
1515 }
1516
1517 if (odip != ndip) {
1518 if (!ndip->i_inode.i_nlink) {
1519 error = -ENOENT;
1520 goto out_gunlock;
1521 }
1522 if (ndip->i_entries == (u32)-1) {
1523 error = -EFBIG;
1524 goto out_gunlock;
1525 }
1526 if (S_ISDIR(ip->i_inode.i_mode) &&
1527 ndip->i_inode.i_nlink == (u32)-1) {
1528 error = -EMLINK;
1529 goto out_gunlock;
1530 }
1531 }
1532 }
1533
1534 /* Check out the dir to be renamed */
1535
1536 if (dir_rename) {
1537 error = gfs2_permission(&init_user_ns, d_inode(odentry),
1538 MAY_WRITE);
1539 if (error)
1540 goto out_gunlock;
1541 }
1542
1543 if (nip == NULL) {
1544 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1545 if (error)
1546 goto out_gunlock;
1547 }
1548
1549 if (da.nr_blocks) {
1550 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1551 error = gfs2_quota_lock_check(ndip, &ap);
1552 if (error)
1553 goto out_gunlock;
1554
1555 error = gfs2_inplace_reserve(ndip, &ap);
1556 if (error)
1557 goto out_gunlock_q;
1558
1559 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1560 4 * RES_LEAF + 4, 0);
1561 if (error)
1562 goto out_ipreserv;
1563 } else {
1564 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1565 5 * RES_LEAF + 4, 0);
1566 if (error)
1567 goto out_gunlock;
1568 }
1569
1570 /* Remove the target file, if it exists */
1571
1572 if (nip)
1573 error = gfs2_unlink_inode(ndip, ndentry);
1574
1575 error = update_moved_ino(ip, ndip, dir_rename);
1576 if (error)
1577 goto out_end_trans;
1578
1579 error = gfs2_dir_del(odip, odentry);
1580 if (error)
1581 goto out_end_trans;
1582
1583 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1584 if (error)
1585 goto out_end_trans;
1586
1587out_end_trans:
1588 gfs2_trans_end(sdp);
1589out_ipreserv:
1590 if (da.nr_blocks)
1591 gfs2_inplace_release(ndip);
1592out_gunlock_q:
1593 if (da.nr_blocks)
1594 gfs2_quota_unlock(ndip);
1595out_gunlock:
1596 gfs2_dir_no_add(&da);
1597 if (gfs2_holder_initialized(&rd_gh))
1598 gfs2_glock_dq_uninit(&rd_gh);
1599
1600 while (x--) {
1601 if (gfs2_holder_queued(ghs + x))
1602 gfs2_glock_dq(ghs + x);
1603 gfs2_holder_uninit(ghs + x);
1604 }
1605out_gunlock_r:
1606 if (gfs2_holder_initialized(&r_gh))
1607 gfs2_glock_dq_uninit(&r_gh);
1608out:
1609 gfs2_qa_put(ndip);
1610 return error;
1611}
1612
1613/**
1614 * gfs2_exchange - exchange two files
1615 * @odir: Parent directory of old file name
1616 * @odentry: The old dentry of the file
1617 * @ndir: Parent directory of new file name
1618 * @ndentry: The new dentry of the file
1619 * @flags: The rename flags
1620 *
1621 * Returns: errno
1622 */
1623
1624static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1625 struct inode *ndir, struct dentry *ndentry,
1626 unsigned int flags)
1627{
1628 struct gfs2_inode *odip = GFS2_I(odir);
1629 struct gfs2_inode *ndip = GFS2_I(ndir);
1630 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1631 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1632 struct gfs2_sbd *sdp = GFS2_SB(odir);
1633 struct gfs2_holder ghs[4], r_gh;
1634 unsigned int num_gh;
1635 unsigned int x;
1636 umode_t old_mode = oip->i_inode.i_mode;
1637 umode_t new_mode = nip->i_inode.i_mode;
1638 int error;
1639
1640 gfs2_holder_mark_uninitialized(&r_gh);
1641 error = gfs2_rindex_update(sdp);
1642 if (error)
1643 return error;
1644
1645 if (odip != ndip) {
1646 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1647 0, &r_gh);
1648 if (error)
1649 goto out;
1650
1651 if (S_ISDIR(old_mode)) {
1652 /* don't move a directory into its subdir */
1653 error = gfs2_ok_to_move(oip, ndip);
1654 if (error)
1655 goto out_gunlock_r;
1656 }
1657
1658 if (S_ISDIR(new_mode)) {
1659 /* don't move a directory into its subdir */
1660 error = gfs2_ok_to_move(nip, odip);
1661 if (error)
1662 goto out_gunlock_r;
1663 }
1664 }
1665
1666 num_gh = 1;
1667 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1668 if (odip != ndip) {
1669 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1670 ghs + num_gh);
1671 num_gh++;
1672 }
1673 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1674 num_gh++;
1675
1676 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1677 num_gh++;
1678
1679 for (x = 0; x < num_gh; x++) {
1680 error = gfs2_glock_nq(ghs + x);
1681 if (error)
1682 goto out_gunlock;
1683 }
1684
1685 error = gfs2_glock_async_wait(num_gh, ghs);
1686 if (error)
1687 goto out_gunlock;
1688
1689 error = -ENOENT;
1690 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1691 goto out_gunlock;
1692
1693 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1694 if (error)
1695 goto out_gunlock;
1696 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1697 if (error)
1698 goto out_gunlock;
1699
1700 if (S_ISDIR(old_mode)) {
1701 error = gfs2_permission(&init_user_ns, odentry->d_inode,
1702 MAY_WRITE);
1703 if (error)
1704 goto out_gunlock;
1705 }
1706 if (S_ISDIR(new_mode)) {
1707 error = gfs2_permission(&init_user_ns, ndentry->d_inode,
1708 MAY_WRITE);
1709 if (error)
1710 goto out_gunlock;
1711 }
1712 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1713 if (error)
1714 goto out_gunlock;
1715
1716 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1717 if (error)
1718 goto out_end_trans;
1719
1720 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1721 if (error)
1722 goto out_end_trans;
1723
1724 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1725 IF2DT(old_mode));
1726 if (error)
1727 goto out_end_trans;
1728
1729 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1730 IF2DT(new_mode));
1731 if (error)
1732 goto out_end_trans;
1733
1734 if (odip != ndip) {
1735 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1736 inc_nlink(&odip->i_inode);
1737 drop_nlink(&ndip->i_inode);
1738 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1739 inc_nlink(&ndip->i_inode);
1740 drop_nlink(&odip->i_inode);
1741 }
1742 }
1743 mark_inode_dirty(&ndip->i_inode);
1744 if (odip != ndip)
1745 mark_inode_dirty(&odip->i_inode);
1746
1747out_end_trans:
1748 gfs2_trans_end(sdp);
1749out_gunlock:
1750 while (x--) {
1751 if (gfs2_holder_queued(ghs + x))
1752 gfs2_glock_dq(ghs + x);
1753 gfs2_holder_uninit(ghs + x);
1754 }
1755out_gunlock_r:
1756 if (gfs2_holder_initialized(&r_gh))
1757 gfs2_glock_dq_uninit(&r_gh);
1758out:
1759 return error;
1760}
1761
1762static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
1763 struct dentry *odentry, struct inode *ndir,
1764 struct dentry *ndentry, unsigned int flags)
1765{
1766 flags &= ~RENAME_NOREPLACE;
1767
1768 if (flags & ~RENAME_EXCHANGE)
1769 return -EINVAL;
1770
1771 if (flags & RENAME_EXCHANGE)
1772 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1773
1774 return gfs2_rename(odir, odentry, ndir, ndentry);
1775}
1776
1777/**
1778 * gfs2_get_link - Follow a symbolic link
1779 * @dentry: The dentry of the link
1780 * @inode: The inode of the link
1781 * @done: destructor for return value
1782 *
1783 * This can handle symlinks of any size.
1784 *
1785 * Returns: 0 on success or error code
1786 */
1787
1788static const char *gfs2_get_link(struct dentry *dentry,
1789 struct inode *inode,
1790 struct delayed_call *done)
1791{
1792 struct gfs2_inode *ip = GFS2_I(inode);
1793 struct gfs2_holder i_gh;
1794 struct buffer_head *dibh;
1795 unsigned int size;
1796 char *buf;
1797 int error;
1798
1799 if (!dentry)
1800 return ERR_PTR(-ECHILD);
1801
1802 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1803 error = gfs2_glock_nq(&i_gh);
1804 if (error) {
1805 gfs2_holder_uninit(&i_gh);
1806 return ERR_PTR(error);
1807 }
1808
1809 size = (unsigned int)i_size_read(&ip->i_inode);
1810 if (size == 0) {
1811 gfs2_consist_inode(ip);
1812 buf = ERR_PTR(-EIO);
1813 goto out;
1814 }
1815
1816 error = gfs2_meta_inode_buffer(ip, &dibh);
1817 if (error) {
1818 buf = ERR_PTR(error);
1819 goto out;
1820 }
1821
1822 buf = kzalloc(size + 1, GFP_NOFS);
1823 if (!buf)
1824 buf = ERR_PTR(-ENOMEM);
1825 else
1826 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1827 brelse(dibh);
1828out:
1829 gfs2_glock_dq_uninit(&i_gh);
1830 if (!IS_ERR(buf))
1831 set_delayed_call(done, kfree_link, buf);
1832 return buf;
1833}
1834
1835/**
1836 * gfs2_permission
1837 * @mnt_userns: User namespace of the mount the inode was found from
1838 * @inode: The inode
1839 * @mask: The mask to be tested
1840 *
1841 * This may be called from the VFS directly, or from within GFS2 with the
1842 * inode locked, so we look to see if the glock is already locked and only
1843 * lock the glock if its not already been done.
1844 *
1845 * Returns: errno
1846 */
1847
1848int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
1849 int mask)
1850{
1851 struct gfs2_inode *ip;
1852 struct gfs2_holder i_gh;
1853 int error;
1854
1855 gfs2_holder_mark_uninitialized(&i_gh);
1856 ip = GFS2_I(inode);
1857 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1858 if (mask & MAY_NOT_BLOCK)
1859 return -ECHILD;
1860 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1861 if (error)
1862 return error;
1863 }
1864
1865 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1866 error = -EPERM;
1867 else
1868 error = generic_permission(&init_user_ns, inode, mask);
1869 if (gfs2_holder_initialized(&i_gh))
1870 gfs2_glock_dq_uninit(&i_gh);
1871
1872 return error;
1873}
1874
1875static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1876{
1877 setattr_copy(&init_user_ns, inode, attr);
1878 mark_inode_dirty(inode);
1879 return 0;
1880}
1881
1882static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1883{
1884 int error;
1885
1886 if (current->journal_info)
1887 return __gfs2_setattr_simple(inode, attr);
1888
1889 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1890 if (error)
1891 return error;
1892
1893 error = __gfs2_setattr_simple(inode, attr);
1894 gfs2_trans_end(GFS2_SB(inode));
1895 return error;
1896}
1897
1898static int setattr_chown(struct inode *inode, struct iattr *attr)
1899{
1900 struct gfs2_inode *ip = GFS2_I(inode);
1901 struct gfs2_sbd *sdp = GFS2_SB(inode);
1902 kuid_t ouid, nuid;
1903 kgid_t ogid, ngid;
1904 int error;
1905 struct gfs2_alloc_parms ap;
1906
1907 ouid = inode->i_uid;
1908 ogid = inode->i_gid;
1909 nuid = attr->ia_uid;
1910 ngid = attr->ia_gid;
1911
1912 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1913 ouid = nuid = NO_UID_QUOTA_CHANGE;
1914 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1915 ogid = ngid = NO_GID_QUOTA_CHANGE;
1916 error = gfs2_qa_get(ip);
1917 if (error)
1918 return error;
1919
1920 error = gfs2_rindex_update(sdp);
1921 if (error)
1922 goto out;
1923
1924 error = gfs2_quota_lock(ip, nuid, ngid);
1925 if (error)
1926 goto out;
1927
1928 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1929
1930 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1931 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1932 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1933 if (error)
1934 goto out_gunlock_q;
1935 }
1936
1937 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1938 if (error)
1939 goto out_gunlock_q;
1940
1941 error = gfs2_setattr_simple(inode, attr);
1942 if (error)
1943 goto out_end_trans;
1944
1945 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1946 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1947 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1948 gfs2_quota_change(ip, ap.target, nuid, ngid);
1949 }
1950
1951out_end_trans:
1952 gfs2_trans_end(sdp);
1953out_gunlock_q:
1954 gfs2_quota_unlock(ip);
1955out:
1956 gfs2_qa_put(ip);
1957 return error;
1958}
1959
1960/**
1961 * gfs2_setattr - Change attributes on an inode
1962 * @mnt_userns: User namespace of the mount the inode was found from
1963 * @dentry: The dentry which is changing
1964 * @attr: The structure describing the change
1965 *
1966 * The VFS layer wants to change one or more of an inodes attributes. Write
1967 * that change out to disk.
1968 *
1969 * Returns: errno
1970 */
1971
1972static int gfs2_setattr(struct user_namespace *mnt_userns,
1973 struct dentry *dentry, struct iattr *attr)
1974{
1975 struct inode *inode = d_inode(dentry);
1976 struct gfs2_inode *ip = GFS2_I(inode);
1977 struct gfs2_holder i_gh;
1978 int error;
1979
1980 error = gfs2_qa_get(ip);
1981 if (error)
1982 return error;
1983
1984 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1985 if (error)
1986 goto out;
1987
1988 error = -EPERM;
1989 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1990 goto error;
1991
1992 error = setattr_prepare(&init_user_ns, dentry, attr);
1993 if (error)
1994 goto error;
1995
1996 if (attr->ia_valid & ATTR_SIZE)
1997 error = gfs2_setattr_size(inode, attr->ia_size);
1998 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1999 error = setattr_chown(inode, attr);
2000 else {
2001 error = gfs2_setattr_simple(inode, attr);
2002 if (!error && attr->ia_valid & ATTR_MODE)
2003 error = posix_acl_chmod(&init_user_ns, inode,
2004 inode->i_mode);
2005 }
2006
2007error:
2008 if (!error)
2009 mark_inode_dirty(inode);
2010 gfs2_glock_dq_uninit(&i_gh);
2011out:
2012 gfs2_qa_put(ip);
2013 return error;
2014}
2015
2016/**
2017 * gfs2_getattr - Read out an inode's attributes
2018 * @mnt_userns: user namespace of the mount the inode was found from
2019 * @path: Object to query
2020 * @stat: The inode's stats
2021 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2022 * @flags: AT_STATX_xxx setting
2023 *
2024 * This may be called from the VFS directly, or from within GFS2 with the
2025 * inode locked, so we look to see if the glock is already locked and only
2026 * lock the glock if its not already been done. Note that its the NFS
2027 * readdirplus operation which causes this to be called (from filldir)
2028 * with the glock already held.
2029 *
2030 * Returns: errno
2031 */
2032
2033static int gfs2_getattr(struct user_namespace *mnt_userns,
2034 const struct path *path, struct kstat *stat,
2035 u32 request_mask, unsigned int flags)
2036{
2037 struct inode *inode = d_inode(path->dentry);
2038 struct gfs2_inode *ip = GFS2_I(inode);
2039 struct gfs2_holder gh;
2040 u32 gfsflags;
2041 int error;
2042
2043 gfs2_holder_mark_uninitialized(&gh);
2044 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2045 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2046 if (error)
2047 return error;
2048 }
2049
2050 gfsflags = ip->i_diskflags;
2051 if (gfsflags & GFS2_DIF_APPENDONLY)
2052 stat->attributes |= STATX_ATTR_APPEND;
2053 if (gfsflags & GFS2_DIF_IMMUTABLE)
2054 stat->attributes |= STATX_ATTR_IMMUTABLE;
2055
2056 stat->attributes_mask |= (STATX_ATTR_APPEND |
2057 STATX_ATTR_COMPRESSED |
2058 STATX_ATTR_ENCRYPTED |
2059 STATX_ATTR_IMMUTABLE |
2060 STATX_ATTR_NODUMP);
2061
2062 generic_fillattr(&init_user_ns, inode, stat);
2063
2064 if (gfs2_holder_initialized(&gh))
2065 gfs2_glock_dq_uninit(&gh);
2066
2067 return 0;
2068}
2069
2070static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2071 u64 start, u64 len)
2072{
2073 struct gfs2_inode *ip = GFS2_I(inode);
2074 struct gfs2_holder gh;
2075 int ret;
2076
2077 inode_lock_shared(inode);
2078
2079 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2080 if (ret)
2081 goto out;
2082
2083 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2084
2085 gfs2_glock_dq_uninit(&gh);
2086
2087out:
2088 inode_unlock_shared(inode);
2089 return ret;
2090}
2091
2092loff_t gfs2_seek_data(struct file *file, loff_t offset)
2093{
2094 struct inode *inode = file->f_mapping->host;
2095 struct gfs2_inode *ip = GFS2_I(inode);
2096 struct gfs2_holder gh;
2097 loff_t ret;
2098
2099 inode_lock_shared(inode);
2100 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2101 if (!ret)
2102 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2103 gfs2_glock_dq_uninit(&gh);
2104 inode_unlock_shared(inode);
2105
2106 if (ret < 0)
2107 return ret;
2108 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2109}
2110
2111loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2112{
2113 struct inode *inode = file->f_mapping->host;
2114 struct gfs2_inode *ip = GFS2_I(inode);
2115 struct gfs2_holder gh;
2116 loff_t ret;
2117
2118 inode_lock_shared(inode);
2119 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2120 if (!ret)
2121 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2122 gfs2_glock_dq_uninit(&gh);
2123 inode_unlock_shared(inode);
2124
2125 if (ret < 0)
2126 return ret;
2127 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2128}
2129
2130static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
2131 int flags)
2132{
2133 struct gfs2_inode *ip = GFS2_I(inode);
2134 struct gfs2_glock *gl = ip->i_gl;
2135 struct gfs2_holder *gh;
2136 int error;
2137
2138 gh = gfs2_glock_is_locked_by_me(gl);
2139 if (gh && !gfs2_glock_is_held_excl(gl)) {
2140 gfs2_glock_dq(gh);
2141 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2142 error = gfs2_glock_nq(gh);
2143 if (error)
2144 return error;
2145 }
2146 return generic_update_time(inode, time, flags);
2147}
2148
2149static const struct inode_operations gfs2_file_iops = {
2150 .permission = gfs2_permission,
2151 .setattr = gfs2_setattr,
2152 .getattr = gfs2_getattr,
2153 .listxattr = gfs2_listxattr,
2154 .fiemap = gfs2_fiemap,
2155 .get_acl = gfs2_get_acl,
2156 .set_acl = gfs2_set_acl,
2157 .update_time = gfs2_update_time,
2158 .fileattr_get = gfs2_fileattr_get,
2159 .fileattr_set = gfs2_fileattr_set,
2160};
2161
2162static const struct inode_operations gfs2_dir_iops = {
2163 .create = gfs2_create,
2164 .lookup = gfs2_lookup,
2165 .link = gfs2_link,
2166 .unlink = gfs2_unlink,
2167 .symlink = gfs2_symlink,
2168 .mkdir = gfs2_mkdir,
2169 .rmdir = gfs2_unlink,
2170 .mknod = gfs2_mknod,
2171 .rename = gfs2_rename2,
2172 .permission = gfs2_permission,
2173 .setattr = gfs2_setattr,
2174 .getattr = gfs2_getattr,
2175 .listxattr = gfs2_listxattr,
2176 .fiemap = gfs2_fiemap,
2177 .get_acl = gfs2_get_acl,
2178 .set_acl = gfs2_set_acl,
2179 .update_time = gfs2_update_time,
2180 .atomic_open = gfs2_atomic_open,
2181 .fileattr_get = gfs2_fileattr_get,
2182 .fileattr_set = gfs2_fileattr_set,
2183};
2184
2185static const struct inode_operations gfs2_symlink_iops = {
2186 .get_link = gfs2_get_link,
2187 .permission = gfs2_permission,
2188 .setattr = gfs2_setattr,
2189 .getattr = gfs2_getattr,
2190 .listxattr = gfs2_listxattr,
2191 .fiemap = gfs2_fiemap,
2192};
2193