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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(-ENOMEM);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191fail_refresh:
192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204}
205
206struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208{
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244fail_iput:
245 iput(inode);
246 goto fail;
247}
248
249
250struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251{
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265}
266
267
268/**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285{
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == sb->s_root->d_inode)) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name, false);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325}
326
327/**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338{
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 if (dip->i_entries == (u32)-1)
350 return -EFBIG;
351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
352 return -EMLINK;
353
354 return 0;
355}
356
357static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358 struct inode *inode)
359{
360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361 (dip->i_inode.i_mode & S_ISUID) &&
362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363 if (S_ISDIR(inode->i_mode))
364 inode->i_mode |= S_ISUID;
365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366 inode->i_mode &= ~07111;
367 inode->i_uid = dip->i_inode.i_uid;
368 } else
369 inode->i_uid = current_fsuid();
370
371 if (dip->i_inode.i_mode & S_ISGID) {
372 if (S_ISDIR(inode->i_mode))
373 inode->i_mode |= S_ISGID;
374 inode->i_gid = dip->i_inode.i_gid;
375 } else
376 inode->i_gid = current_fsgid();
377}
378
379static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
380{
381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383 int error;
384
385 error = gfs2_quota_lock_check(ip);
386 if (error)
387 goto out;
388
389 error = gfs2_inplace_reserve(ip, &ap);
390 if (error)
391 goto out_quota;
392
393 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
394 if (error)
395 goto out_ipreserv;
396
397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
398 ip->i_no_formal_ino = ip->i_generation;
399 ip->i_inode.i_ino = ip->i_no_addr;
400 ip->i_goal = ip->i_no_addr;
401
402 gfs2_trans_end(sdp);
403
404out_ipreserv:
405 gfs2_inplace_release(ip);
406out_quota:
407 gfs2_quota_unlock(ip);
408out:
409 return error;
410}
411
412static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
414{
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
417
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
426
427}
428
429/**
430 * gfs2_init_xattr - Initialise an xattr block for a new inode
431 * @ip: The inode in question
432 *
433 * This sets up an empty xattr block for a new inode, ready to
434 * take any ACLs, LSM xattrs, etc.
435 */
436
437static void gfs2_init_xattr(struct gfs2_inode *ip)
438{
439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440 struct buffer_head *bh;
441 struct gfs2_ea_header *ea;
442
443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444 gfs2_trans_add_meta(ip->i_gl, bh);
445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447
448 ea = GFS2_EA_BH2FIRST(bh);
449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450 ea->ea_type = GFS2_EATYPE_UNUSED;
451 ea->ea_flags = GFS2_EAFLAG_LAST;
452
453 brelse(bh);
454}
455
456/**
457 * init_dinode - Fill in a new dinode structure
458 * @dip: The directory this inode is being created in
459 * @ip: The inode
460 * @symname: The symlink destination (if a symlink)
461 * @bhp: The buffer head (returned to caller)
462 *
463 */
464
465static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466 const char *symname)
467{
468 struct gfs2_dinode *di;
469 struct buffer_head *dibh;
470
471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472 gfs2_trans_add_meta(ip->i_gl, dibh);
473 di = (struct gfs2_dinode *)dibh->b_data;
474 gfs2_dinode_out(ip, di);
475
476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478 di->__pad1 = 0;
479 di->__pad2 = 0;
480 di->__pad3 = 0;
481 memset(&di->__pad4, 0, sizeof(di->__pad4));
482 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484
485 switch(ip->i_inode.i_mode & S_IFMT) {
486 case S_IFDIR:
487 gfs2_init_dir(dibh, dip);
488 break;
489 case S_IFLNK:
490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491 break;
492 }
493
494 set_buffer_uptodate(dibh);
495 brelse(dibh);
496}
497
498/**
499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500 * @dip: The directory we are linking into
501 * @da: The dir add information
502 * @nr_inodes: The number of inodes involved
503 *
504 * This calculate the number of blocks we need to reserve in a
505 * transaction to link @nr_inodes into a directory. In most cases
506 * @nr_inodes will be 2 (the directory plus the inode being linked in)
507 * but in case of rename, 4 may be required.
508 *
509 * Returns: Number of blocks
510 */
511
512static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513 const struct gfs2_diradd *da,
514 unsigned nr_inodes)
515{
516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518}
519
520static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521 struct gfs2_inode *ip, struct gfs2_diradd *da)
522{
523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525 int error;
526
527 if (da->nr_blocks) {
528 error = gfs2_quota_lock_check(dip);
529 if (error)
530 goto fail_quota_locks;
531
532 error = gfs2_inplace_reserve(dip, &ap);
533 if (error)
534 goto fail_quota_locks;
535
536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537 if (error)
538 goto fail_ipreserv;
539 } else {
540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541 if (error)
542 goto fail_quota_locks;
543 }
544
545 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 if (error)
547 goto fail_end_trans;
548
549fail_end_trans:
550 gfs2_trans_end(sdp);
551fail_ipreserv:
552 gfs2_inplace_release(dip);
553fail_quota_locks:
554 gfs2_quota_unlock(dip);
555 return error;
556}
557
558static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
559 void *fs_info)
560{
561 const struct xattr *xattr;
562 int err = 0;
563
564 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
566 xattr->value_len, 0,
567 GFS2_EATYPE_SECURITY);
568 if (err < 0)
569 break;
570 }
571 return err;
572}
573
574/**
575 * gfs2_create_inode - Create a new inode
576 * @dir: The parent directory
577 * @dentry: The new dentry
578 * @file: If non-NULL, the file which is being opened
579 * @mode: The permissions on the new inode
580 * @dev: For device nodes, this is the device number
581 * @symname: For symlinks, this is the link destination
582 * @size: The initial size of the inode (ignored for directories)
583 *
584 * Returns: 0 on success, or error code
585 */
586
587static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
588 struct file *file,
589 umode_t mode, dev_t dev, const char *symname,
590 unsigned int size, int excl, int *opened)
591{
592 const struct qstr *name = &dentry->d_name;
593 struct posix_acl *default_acl, *acl;
594 struct gfs2_holder ghs[2];
595 struct inode *inode = NULL;
596 struct gfs2_inode *dip = GFS2_I(dir), *ip;
597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
598 struct gfs2_glock *io_gl;
599 struct dentry *d;
600 int error, free_vfs_inode = 0;
601 u32 aflags = 0;
602 unsigned blocks = 1;
603 struct gfs2_diradd da = { .bh = NULL, };
604
605 if (!name->len || name->len > GFS2_FNAMESIZE)
606 return -ENAMETOOLONG;
607
608 error = gfs2_rs_alloc(dip);
609 if (error)
610 return error;
611
612 error = gfs2_rindex_update(sdp);
613 if (error)
614 return error;
615
616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
617 if (error)
618 goto fail;
619
620 error = create_ok(dip, name, mode);
621 if (error)
622 goto fail_gunlock;
623
624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
625 error = PTR_ERR(inode);
626 if (!IS_ERR(inode)) {
627 d = d_splice_alias(inode, dentry);
628 error = PTR_ERR(d);
629 if (IS_ERR(d))
630 goto fail_gunlock;
631 error = 0;
632 if (file) {
633 if (S_ISREG(inode->i_mode)) {
634 WARN_ON(d != NULL);
635 error = finish_open(file, dentry, gfs2_open_common, opened);
636 } else {
637 error = finish_no_open(file, d);
638 }
639 } else {
640 dput(d);
641 }
642 gfs2_glock_dq_uninit(ghs);
643 return error;
644 } else if (error != -ENOENT) {
645 goto fail_gunlock;
646 }
647
648 error = gfs2_diradd_alloc_required(dir, name, &da);
649 if (error < 0)
650 goto fail_gunlock;
651
652 inode = new_inode(sdp->sd_vfs);
653 error = -ENOMEM;
654 if (!inode)
655 goto fail_gunlock;
656
657 error = posix_acl_create(dir, &mode, &default_acl, &acl);
658 if (error)
659 goto fail_free_vfs_inode;
660
661 ip = GFS2_I(inode);
662 error = gfs2_rs_alloc(ip);
663 if (error)
664 goto fail_free_acls;
665
666 inode->i_mode = mode;
667 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
668 inode->i_rdev = dev;
669 inode->i_size = size;
670 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
671 gfs2_set_inode_blocks(inode, 1);
672 munge_mode_uid_gid(dip, inode);
673 ip->i_goal = dip->i_goal;
674 ip->i_diskflags = 0;
675 ip->i_eattr = 0;
676 ip->i_height = 0;
677 ip->i_depth = 0;
678 ip->i_entries = 0;
679
680 switch(mode & S_IFMT) {
681 case S_IFREG:
682 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
683 gfs2_tune_get(sdp, gt_new_files_jdata))
684 ip->i_diskflags |= GFS2_DIF_JDATA;
685 gfs2_set_aops(inode);
686 break;
687 case S_IFDIR:
688 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
689 ip->i_diskflags |= GFS2_DIF_JDATA;
690 ip->i_entries = 2;
691 break;
692 }
693 gfs2_set_inode_flags(inode);
694
695 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
696 (dip->i_diskflags & GFS2_DIF_TOPDIR))
697 aflags |= GFS2_AF_ORLOV;
698
699 if (default_acl || acl)
700 blocks++;
701
702 error = alloc_dinode(ip, aflags, &blocks);
703 if (error)
704 goto fail_free_inode;
705
706 gfs2_set_inode_blocks(inode, blocks);
707
708 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
709 if (error)
710 goto fail_free_inode;
711
712 ip->i_gl->gl_object = ip;
713 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
714 if (error)
715 goto fail_free_inode;
716
717 error = gfs2_trans_begin(sdp, blocks, 0);
718 if (error)
719 goto fail_gunlock2;
720
721 if (blocks > 1) {
722 ip->i_eattr = ip->i_no_addr + 1;
723 gfs2_init_xattr(ip);
724 }
725 init_dinode(dip, ip, symname);
726 gfs2_trans_end(sdp);
727
728 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
729 if (error)
730 goto fail_gunlock2;
731
732 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
733 if (error)
734 goto fail_gunlock2;
735
736 ip->i_iopen_gh.gh_gl->gl_object = ip;
737 gfs2_glock_put(io_gl);
738 gfs2_set_iop(inode);
739 insert_inode_hash(inode);
740
741 if (default_acl) {
742 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
743 posix_acl_release(default_acl);
744 }
745 if (acl) {
746 if (!error)
747 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
748 posix_acl_release(acl);
749 }
750
751 if (error)
752 goto fail_gunlock3;
753
754 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
755 &gfs2_initxattrs, NULL);
756 if (error)
757 goto fail_gunlock3;
758
759 error = link_dinode(dip, name, ip, &da);
760 if (error)
761 goto fail_gunlock3;
762
763 mark_inode_dirty(inode);
764 d_instantiate(dentry, inode);
765 if (file) {
766 *opened |= FILE_CREATED;
767 error = finish_open(file, dentry, gfs2_open_common, opened);
768 }
769 gfs2_glock_dq_uninit(ghs);
770 gfs2_glock_dq_uninit(ghs + 1);
771 return error;
772
773fail_gunlock3:
774 gfs2_glock_dq_uninit(ghs + 1);
775 if (ip->i_gl)
776 gfs2_glock_put(ip->i_gl);
777 goto fail_gunlock;
778
779fail_gunlock2:
780 gfs2_glock_dq_uninit(ghs + 1);
781fail_free_inode:
782 if (ip->i_gl)
783 gfs2_glock_put(ip->i_gl);
784 gfs2_rs_delete(ip, NULL);
785fail_free_acls:
786 if (default_acl)
787 posix_acl_release(default_acl);
788 if (acl)
789 posix_acl_release(acl);
790fail_free_vfs_inode:
791 free_vfs_inode = 1;
792fail_gunlock:
793 gfs2_dir_no_add(&da);
794 gfs2_glock_dq_uninit(ghs);
795 if (inode && !IS_ERR(inode)) {
796 clear_nlink(inode);
797 if (!free_vfs_inode)
798 mark_inode_dirty(inode);
799 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
800 &GFS2_I(inode)->i_flags);
801 iput(inode);
802 }
803fail:
804 return error;
805}
806
807/**
808 * gfs2_create - Create a file
809 * @dir: The directory in which to create the file
810 * @dentry: The dentry of the new file
811 * @mode: The mode of the new file
812 *
813 * Returns: errno
814 */
815
816static int gfs2_create(struct inode *dir, struct dentry *dentry,
817 umode_t mode, bool excl)
818{
819 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
820}
821
822/**
823 * __gfs2_lookup - Look up a filename in a directory and return its inode
824 * @dir: The directory inode
825 * @dentry: The dentry of the new inode
826 * @file: File to be opened
827 * @opened: atomic_open flags
828 *
829 *
830 * Returns: errno
831 */
832
833static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
834 struct file *file, int *opened)
835{
836 struct inode *inode;
837 struct dentry *d;
838 struct gfs2_holder gh;
839 struct gfs2_glock *gl;
840 int error;
841
842 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
843 if (!inode)
844 return NULL;
845 if (IS_ERR(inode))
846 return ERR_CAST(inode);
847
848 gl = GFS2_I(inode)->i_gl;
849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
850 if (error) {
851 iput(inode);
852 return ERR_PTR(error);
853 }
854
855 d = d_splice_alias(inode, dentry);
856 if (IS_ERR(d)) {
857 iput(inode);
858 gfs2_glock_dq_uninit(&gh);
859 return d;
860 }
861 if (file && S_ISREG(inode->i_mode))
862 error = finish_open(file, dentry, gfs2_open_common, opened);
863
864 gfs2_glock_dq_uninit(&gh);
865 if (error) {
866 dput(d);
867 return ERR_PTR(error);
868 }
869 return d;
870}
871
872static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
873 unsigned flags)
874{
875 return __gfs2_lookup(dir, dentry, NULL, NULL);
876}
877
878/**
879 * gfs2_link - Link to a file
880 * @old_dentry: The inode to link
881 * @dir: Add link to this directory
882 * @dentry: The name of the link
883 *
884 * Link the inode in "old_dentry" into the directory "dir" with the
885 * name in "dentry".
886 *
887 * Returns: errno
888 */
889
890static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
891 struct dentry *dentry)
892{
893 struct gfs2_inode *dip = GFS2_I(dir);
894 struct gfs2_sbd *sdp = GFS2_SB(dir);
895 struct inode *inode = old_dentry->d_inode;
896 struct gfs2_inode *ip = GFS2_I(inode);
897 struct gfs2_holder ghs[2];
898 struct buffer_head *dibh;
899 struct gfs2_diradd da = { .bh = NULL, };
900 int error;
901
902 if (S_ISDIR(inode->i_mode))
903 return -EPERM;
904
905 error = gfs2_rs_alloc(dip);
906 if (error)
907 return error;
908
909 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
910 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
911
912 error = gfs2_glock_nq(ghs); /* parent */
913 if (error)
914 goto out_parent;
915
916 error = gfs2_glock_nq(ghs + 1); /* child */
917 if (error)
918 goto out_child;
919
920 error = -ENOENT;
921 if (inode->i_nlink == 0)
922 goto out_gunlock;
923
924 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
925 if (error)
926 goto out_gunlock;
927
928 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
929 switch (error) {
930 case -ENOENT:
931 break;
932 case 0:
933 error = -EEXIST;
934 default:
935 goto out_gunlock;
936 }
937
938 error = -EINVAL;
939 if (!dip->i_inode.i_nlink)
940 goto out_gunlock;
941 error = -EFBIG;
942 if (dip->i_entries == (u32)-1)
943 goto out_gunlock;
944 error = -EPERM;
945 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
946 goto out_gunlock;
947 error = -EINVAL;
948 if (!ip->i_inode.i_nlink)
949 goto out_gunlock;
950 error = -EMLINK;
951 if (ip->i_inode.i_nlink == (u32)-1)
952 goto out_gunlock;
953
954 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
955 if (error < 0)
956 goto out_gunlock;
957
958 if (da.nr_blocks) {
959 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
960 error = gfs2_quota_lock_check(dip);
961 if (error)
962 goto out_gunlock;
963
964 error = gfs2_inplace_reserve(dip, &ap);
965 if (error)
966 goto out_gunlock_q;
967
968 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
969 if (error)
970 goto out_ipres;
971 } else {
972 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
973 if (error)
974 goto out_ipres;
975 }
976
977 error = gfs2_meta_inode_buffer(ip, &dibh);
978 if (error)
979 goto out_end_trans;
980
981 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
982 if (error)
983 goto out_brelse;
984
985 gfs2_trans_add_meta(ip->i_gl, dibh);
986 inc_nlink(&ip->i_inode);
987 ip->i_inode.i_ctime = CURRENT_TIME;
988 ihold(inode);
989 d_instantiate(dentry, inode);
990 mark_inode_dirty(inode);
991
992out_brelse:
993 brelse(dibh);
994out_end_trans:
995 gfs2_trans_end(sdp);
996out_ipres:
997 if (da.nr_blocks)
998 gfs2_inplace_release(dip);
999out_gunlock_q:
1000 if (da.nr_blocks)
1001 gfs2_quota_unlock(dip);
1002out_gunlock:
1003 gfs2_dir_no_add(&da);
1004 gfs2_glock_dq(ghs + 1);
1005out_child:
1006 gfs2_glock_dq(ghs);
1007out_parent:
1008 gfs2_holder_uninit(ghs);
1009 gfs2_holder_uninit(ghs + 1);
1010 return error;
1011}
1012
1013/*
1014 * gfs2_unlink_ok - check to see that a inode is still in a directory
1015 * @dip: the directory
1016 * @name: the name of the file
1017 * @ip: the inode
1018 *
1019 * Assumes that the lock on (at least) @dip is held.
1020 *
1021 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1022 */
1023
1024static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1025 const struct gfs2_inode *ip)
1026{
1027 int error;
1028
1029 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1030 return -EPERM;
1031
1032 if ((dip->i_inode.i_mode & S_ISVTX) &&
1033 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1034 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1035 return -EPERM;
1036
1037 if (IS_APPEND(&dip->i_inode))
1038 return -EPERM;
1039
1040 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1041 if (error)
1042 return error;
1043
1044 error = gfs2_dir_check(&dip->i_inode, name, ip);
1045 if (error)
1046 return error;
1047
1048 return 0;
1049}
1050
1051/**
1052 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1053 * @dip: The parent directory
1054 * @name: The name of the entry in the parent directory
1055 * @inode: The inode to be removed
1056 *
1057 * Called with all the locks and in a transaction. This will only be
1058 * called for a directory after it has been checked to ensure it is empty.
1059 *
1060 * Returns: 0 on success, or an error
1061 */
1062
1063static int gfs2_unlink_inode(struct gfs2_inode *dip,
1064 const struct dentry *dentry)
1065{
1066 struct inode *inode = dentry->d_inode;
1067 struct gfs2_inode *ip = GFS2_I(inode);
1068 int error;
1069
1070 error = gfs2_dir_del(dip, dentry);
1071 if (error)
1072 return error;
1073
1074 ip->i_entries = 0;
1075 inode->i_ctime = CURRENT_TIME;
1076 if (S_ISDIR(inode->i_mode))
1077 clear_nlink(inode);
1078 else
1079 drop_nlink(inode);
1080 mark_inode_dirty(inode);
1081 if (inode->i_nlink == 0)
1082 gfs2_unlink_di(inode);
1083 return 0;
1084}
1085
1086
1087/**
1088 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1089 * @dir: The inode of the directory containing the inode to unlink
1090 * @dentry: The file itself
1091 *
1092 * This routine uses the type of the inode as a flag to figure out
1093 * whether this is an unlink or an rmdir.
1094 *
1095 * Returns: errno
1096 */
1097
1098static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1099{
1100 struct gfs2_inode *dip = GFS2_I(dir);
1101 struct gfs2_sbd *sdp = GFS2_SB(dir);
1102 struct inode *inode = dentry->d_inode;
1103 struct gfs2_inode *ip = GFS2_I(inode);
1104 struct gfs2_holder ghs[3];
1105 struct gfs2_rgrpd *rgd;
1106 int error;
1107
1108 error = gfs2_rindex_update(sdp);
1109 if (error)
1110 return error;
1111
1112 error = -EROFS;
1113
1114 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1115 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1116
1117 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1118 if (!rgd)
1119 goto out_inodes;
1120
1121 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1122
1123
1124 error = gfs2_glock_nq(ghs); /* parent */
1125 if (error)
1126 goto out_parent;
1127
1128 error = gfs2_glock_nq(ghs + 1); /* child */
1129 if (error)
1130 goto out_child;
1131
1132 error = -ENOENT;
1133 if (inode->i_nlink == 0)
1134 goto out_rgrp;
1135
1136 if (S_ISDIR(inode->i_mode)) {
1137 error = -ENOTEMPTY;
1138 if (ip->i_entries > 2 || inode->i_nlink > 2)
1139 goto out_rgrp;
1140 }
1141
1142 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1143 if (error)
1144 goto out_rgrp;
1145
1146 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1147 if (error)
1148 goto out_gunlock;
1149
1150 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1151 if (error)
1152 goto out_end_trans;
1153
1154 error = gfs2_unlink_inode(dip, dentry);
1155
1156out_end_trans:
1157 gfs2_trans_end(sdp);
1158out_gunlock:
1159 gfs2_glock_dq(ghs + 2);
1160out_rgrp:
1161 gfs2_glock_dq(ghs + 1);
1162out_child:
1163 gfs2_glock_dq(ghs);
1164out_parent:
1165 gfs2_holder_uninit(ghs + 2);
1166out_inodes:
1167 gfs2_holder_uninit(ghs + 1);
1168 gfs2_holder_uninit(ghs);
1169 return error;
1170}
1171
1172/**
1173 * gfs2_symlink - Create a symlink
1174 * @dir: The directory to create the symlink in
1175 * @dentry: The dentry to put the symlink in
1176 * @symname: The thing which the link points to
1177 *
1178 * Returns: errno
1179 */
1180
1181static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1182 const char *symname)
1183{
1184 struct gfs2_sbd *sdp = GFS2_SB(dir);
1185 unsigned int size;
1186
1187 size = strlen(symname);
1188 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1189 return -ENAMETOOLONG;
1190
1191 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1192}
1193
1194/**
1195 * gfs2_mkdir - Make a directory
1196 * @dir: The parent directory of the new one
1197 * @dentry: The dentry of the new directory
1198 * @mode: The mode of the new directory
1199 *
1200 * Returns: errno
1201 */
1202
1203static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1204{
1205 struct gfs2_sbd *sdp = GFS2_SB(dir);
1206 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1207 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1208}
1209
1210/**
1211 * gfs2_mknod - Make a special file
1212 * @dir: The directory in which the special file will reside
1213 * @dentry: The dentry of the special file
1214 * @mode: The mode of the special file
1215 * @dev: The device specification of the special file
1216 *
1217 */
1218
1219static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1220 dev_t dev)
1221{
1222 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1223}
1224
1225/**
1226 * gfs2_atomic_open - Atomically open a file
1227 * @dir: The directory
1228 * @dentry: The proposed new entry
1229 * @file: The proposed new struct file
1230 * @flags: open flags
1231 * @mode: File mode
1232 * @opened: Flag to say whether the file has been opened or not
1233 *
1234 * Returns: error code or 0 for success
1235 */
1236
1237static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1238 struct file *file, unsigned flags,
1239 umode_t mode, int *opened)
1240{
1241 struct dentry *d;
1242 bool excl = !!(flags & O_EXCL);
1243
1244 d = __gfs2_lookup(dir, dentry, file, opened);
1245 if (IS_ERR(d))
1246 return PTR_ERR(d);
1247 if (d != NULL)
1248 dentry = d;
1249 if (dentry->d_inode) {
1250 if (!(*opened & FILE_OPENED)) {
1251 if (d == NULL)
1252 dget(dentry);
1253 return finish_no_open(file, dentry);
1254 }
1255 dput(d);
1256 return 0;
1257 }
1258
1259 BUG_ON(d != NULL);
1260 if (!(flags & O_CREAT))
1261 return -ENOENT;
1262
1263 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1264}
1265
1266/*
1267 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1268 * @this: move this
1269 * @to: to here
1270 *
1271 * Follow @to back to the root and make sure we don't encounter @this
1272 * Assumes we already hold the rename lock.
1273 *
1274 * Returns: errno
1275 */
1276
1277static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1278{
1279 struct inode *dir = &to->i_inode;
1280 struct super_block *sb = dir->i_sb;
1281 struct inode *tmp;
1282 int error = 0;
1283
1284 igrab(dir);
1285
1286 for (;;) {
1287 if (dir == &this->i_inode) {
1288 error = -EINVAL;
1289 break;
1290 }
1291 if (dir == sb->s_root->d_inode) {
1292 error = 0;
1293 break;
1294 }
1295
1296 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1297 if (!tmp) {
1298 error = -ENOENT;
1299 break;
1300 }
1301 if (IS_ERR(tmp)) {
1302 error = PTR_ERR(tmp);
1303 break;
1304 }
1305
1306 iput(dir);
1307 dir = tmp;
1308 }
1309
1310 iput(dir);
1311
1312 return error;
1313}
1314
1315/**
1316 * gfs2_rename - Rename a file
1317 * @odir: Parent directory of old file name
1318 * @odentry: The old dentry of the file
1319 * @ndir: Parent directory of new file name
1320 * @ndentry: The new dentry of the file
1321 *
1322 * Returns: errno
1323 */
1324
1325static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1326 struct inode *ndir, struct dentry *ndentry)
1327{
1328 struct gfs2_inode *odip = GFS2_I(odir);
1329 struct gfs2_inode *ndip = GFS2_I(ndir);
1330 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1331 struct gfs2_inode *nip = NULL;
1332 struct gfs2_sbd *sdp = GFS2_SB(odir);
1333 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1334 struct gfs2_rgrpd *nrgd;
1335 unsigned int num_gh;
1336 int dir_rename = 0;
1337 struct gfs2_diradd da = { .nr_blocks = 0, };
1338 unsigned int x;
1339 int error;
1340
1341 if (ndentry->d_inode) {
1342 nip = GFS2_I(ndentry->d_inode);
1343 if (ip == nip)
1344 return 0;
1345 }
1346
1347 error = gfs2_rindex_update(sdp);
1348 if (error)
1349 return error;
1350
1351 error = gfs2_rs_alloc(ndip);
1352 if (error)
1353 return error;
1354
1355 if (odip != ndip) {
1356 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1357 0, &r_gh);
1358 if (error)
1359 goto out;
1360
1361 if (S_ISDIR(ip->i_inode.i_mode)) {
1362 dir_rename = 1;
1363 /* don't move a dirctory into it's subdir */
1364 error = gfs2_ok_to_move(ip, ndip);
1365 if (error)
1366 goto out_gunlock_r;
1367 }
1368 }
1369
1370 num_gh = 1;
1371 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1372 if (odip != ndip) {
1373 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1374 num_gh++;
1375 }
1376 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1377 num_gh++;
1378
1379 if (nip) {
1380 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1381 num_gh++;
1382 /* grab the resource lock for unlink flag twiddling
1383 * this is the case of the target file already existing
1384 * so we unlink before doing the rename
1385 */
1386 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1387 if (nrgd)
1388 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1389 }
1390
1391 for (x = 0; x < num_gh; x++) {
1392 error = gfs2_glock_nq(ghs + x);
1393 if (error)
1394 goto out_gunlock;
1395 }
1396
1397 error = -ENOENT;
1398 if (ip->i_inode.i_nlink == 0)
1399 goto out_gunlock;
1400
1401 /* Check out the old directory */
1402
1403 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1404 if (error)
1405 goto out_gunlock;
1406
1407 /* Check out the new directory */
1408
1409 if (nip) {
1410 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1411 if (error)
1412 goto out_gunlock;
1413
1414 if (nip->i_inode.i_nlink == 0) {
1415 error = -EAGAIN;
1416 goto out_gunlock;
1417 }
1418
1419 if (S_ISDIR(nip->i_inode.i_mode)) {
1420 if (nip->i_entries < 2) {
1421 gfs2_consist_inode(nip);
1422 error = -EIO;
1423 goto out_gunlock;
1424 }
1425 if (nip->i_entries > 2) {
1426 error = -ENOTEMPTY;
1427 goto out_gunlock;
1428 }
1429 }
1430 } else {
1431 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1432 if (error)
1433 goto out_gunlock;
1434
1435 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1436 switch (error) {
1437 case -ENOENT:
1438 error = 0;
1439 break;
1440 case 0:
1441 error = -EEXIST;
1442 default:
1443 goto out_gunlock;
1444 };
1445
1446 if (odip != ndip) {
1447 if (!ndip->i_inode.i_nlink) {
1448 error = -ENOENT;
1449 goto out_gunlock;
1450 }
1451 if (ndip->i_entries == (u32)-1) {
1452 error = -EFBIG;
1453 goto out_gunlock;
1454 }
1455 if (S_ISDIR(ip->i_inode.i_mode) &&
1456 ndip->i_inode.i_nlink == (u32)-1) {
1457 error = -EMLINK;
1458 goto out_gunlock;
1459 }
1460 }
1461 }
1462
1463 /* Check out the dir to be renamed */
1464
1465 if (dir_rename) {
1466 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1467 if (error)
1468 goto out_gunlock;
1469 }
1470
1471 if (nip == NULL) {
1472 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 if (da.nr_blocks) {
1478 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1479 error = gfs2_quota_lock_check(ndip);
1480 if (error)
1481 goto out_gunlock;
1482
1483 error = gfs2_inplace_reserve(ndip, &ap);
1484 if (error)
1485 goto out_gunlock_q;
1486
1487 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1488 4 * RES_LEAF + 4, 0);
1489 if (error)
1490 goto out_ipreserv;
1491 } else {
1492 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1493 5 * RES_LEAF + 4, 0);
1494 if (error)
1495 goto out_gunlock;
1496 }
1497
1498 /* Remove the target file, if it exists */
1499
1500 if (nip)
1501 error = gfs2_unlink_inode(ndip, ndentry);
1502
1503 if (dir_rename) {
1504 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1505 if (error)
1506 goto out_end_trans;
1507 } else {
1508 struct buffer_head *dibh;
1509 error = gfs2_meta_inode_buffer(ip, &dibh);
1510 if (error)
1511 goto out_end_trans;
1512 ip->i_inode.i_ctime = CURRENT_TIME;
1513 gfs2_trans_add_meta(ip->i_gl, dibh);
1514 gfs2_dinode_out(ip, dibh->b_data);
1515 brelse(dibh);
1516 }
1517
1518 error = gfs2_dir_del(odip, odentry);
1519 if (error)
1520 goto out_end_trans;
1521
1522 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1523 if (error)
1524 goto out_end_trans;
1525
1526out_end_trans:
1527 gfs2_trans_end(sdp);
1528out_ipreserv:
1529 if (da.nr_blocks)
1530 gfs2_inplace_release(ndip);
1531out_gunlock_q:
1532 if (da.nr_blocks)
1533 gfs2_quota_unlock(ndip);
1534out_gunlock:
1535 gfs2_dir_no_add(&da);
1536 while (x--) {
1537 gfs2_glock_dq(ghs + x);
1538 gfs2_holder_uninit(ghs + x);
1539 }
1540out_gunlock_r:
1541 if (r_gh.gh_gl)
1542 gfs2_glock_dq_uninit(&r_gh);
1543out:
1544 return error;
1545}
1546
1547/**
1548 * gfs2_follow_link - Follow a symbolic link
1549 * @dentry: The dentry of the link
1550 * @nd: Data that we pass to vfs_follow_link()
1551 *
1552 * This can handle symlinks of any size.
1553 *
1554 * Returns: 0 on success or error code
1555 */
1556
1557static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1558{
1559 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1560 struct gfs2_holder i_gh;
1561 struct buffer_head *dibh;
1562 unsigned int size;
1563 char *buf;
1564 int error;
1565
1566 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1567 error = gfs2_glock_nq(&i_gh);
1568 if (error) {
1569 gfs2_holder_uninit(&i_gh);
1570 nd_set_link(nd, ERR_PTR(error));
1571 return NULL;
1572 }
1573
1574 size = (unsigned int)i_size_read(&ip->i_inode);
1575 if (size == 0) {
1576 gfs2_consist_inode(ip);
1577 buf = ERR_PTR(-EIO);
1578 goto out;
1579 }
1580
1581 error = gfs2_meta_inode_buffer(ip, &dibh);
1582 if (error) {
1583 buf = ERR_PTR(error);
1584 goto out;
1585 }
1586
1587 buf = kzalloc(size + 1, GFP_NOFS);
1588 if (!buf)
1589 buf = ERR_PTR(-ENOMEM);
1590 else
1591 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1592 brelse(dibh);
1593out:
1594 gfs2_glock_dq_uninit(&i_gh);
1595 nd_set_link(nd, buf);
1596 return NULL;
1597}
1598
1599/**
1600 * gfs2_permission -
1601 * @inode: The inode
1602 * @mask: The mask to be tested
1603 * @flags: Indicates whether this is an RCU path walk or not
1604 *
1605 * This may be called from the VFS directly, or from within GFS2 with the
1606 * inode locked, so we look to see if the glock is already locked and only
1607 * lock the glock if its not already been done.
1608 *
1609 * Returns: errno
1610 */
1611
1612int gfs2_permission(struct inode *inode, int mask)
1613{
1614 struct gfs2_inode *ip;
1615 struct gfs2_holder i_gh;
1616 int error;
1617 int unlock = 0;
1618
1619
1620 ip = GFS2_I(inode);
1621 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1622 if (mask & MAY_NOT_BLOCK)
1623 return -ECHILD;
1624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1625 if (error)
1626 return error;
1627 unlock = 1;
1628 }
1629
1630 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1631 error = -EACCES;
1632 else
1633 error = generic_permission(inode, mask);
1634 if (unlock)
1635 gfs2_glock_dq_uninit(&i_gh);
1636
1637 return error;
1638}
1639
1640static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1641{
1642 setattr_copy(inode, attr);
1643 mark_inode_dirty(inode);
1644 return 0;
1645}
1646
1647/**
1648 * gfs2_setattr_simple -
1649 * @ip:
1650 * @attr:
1651 *
1652 * Returns: errno
1653 */
1654
1655int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1656{
1657 int error;
1658
1659 if (current->journal_info)
1660 return __gfs2_setattr_simple(inode, attr);
1661
1662 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1663 if (error)
1664 return error;
1665
1666 error = __gfs2_setattr_simple(inode, attr);
1667 gfs2_trans_end(GFS2_SB(inode));
1668 return error;
1669}
1670
1671static int setattr_chown(struct inode *inode, struct iattr *attr)
1672{
1673 struct gfs2_inode *ip = GFS2_I(inode);
1674 struct gfs2_sbd *sdp = GFS2_SB(inode);
1675 kuid_t ouid, nuid;
1676 kgid_t ogid, ngid;
1677 int error;
1678
1679 ouid = inode->i_uid;
1680 ogid = inode->i_gid;
1681 nuid = attr->ia_uid;
1682 ngid = attr->ia_gid;
1683
1684 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1685 ouid = nuid = NO_UID_QUOTA_CHANGE;
1686 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1687 ogid = ngid = NO_GID_QUOTA_CHANGE;
1688
1689 error = get_write_access(inode);
1690 if (error)
1691 return error;
1692
1693 error = gfs2_rs_alloc(ip);
1694 if (error)
1695 goto out;
1696
1697 error = gfs2_rindex_update(sdp);
1698 if (error)
1699 goto out;
1700
1701 error = gfs2_quota_lock(ip, nuid, ngid);
1702 if (error)
1703 goto out;
1704
1705 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1706 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1707 error = gfs2_quota_check(ip, nuid, ngid);
1708 if (error)
1709 goto out_gunlock_q;
1710 }
1711
1712 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1713 if (error)
1714 goto out_gunlock_q;
1715
1716 error = gfs2_setattr_simple(inode, attr);
1717 if (error)
1718 goto out_end_trans;
1719
1720 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1721 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1722 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1723 gfs2_quota_change(ip, -blocks, ouid, ogid);
1724 gfs2_quota_change(ip, blocks, nuid, ngid);
1725 }
1726
1727out_end_trans:
1728 gfs2_trans_end(sdp);
1729out_gunlock_q:
1730 gfs2_quota_unlock(ip);
1731out:
1732 put_write_access(inode);
1733 return error;
1734}
1735
1736/**
1737 * gfs2_setattr - Change attributes on an inode
1738 * @dentry: The dentry which is changing
1739 * @attr: The structure describing the change
1740 *
1741 * The VFS layer wants to change one or more of an inodes attributes. Write
1742 * that change out to disk.
1743 *
1744 * Returns: errno
1745 */
1746
1747static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1748{
1749 struct inode *inode = dentry->d_inode;
1750 struct gfs2_inode *ip = GFS2_I(inode);
1751 struct gfs2_holder i_gh;
1752 int error;
1753
1754 error = gfs2_rs_alloc(ip);
1755 if (error)
1756 return error;
1757
1758 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1759 if (error)
1760 return error;
1761
1762 error = -EPERM;
1763 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1764 goto out;
1765
1766 error = inode_change_ok(inode, attr);
1767 if (error)
1768 goto out;
1769
1770 if (attr->ia_valid & ATTR_SIZE)
1771 error = gfs2_setattr_size(inode, attr->ia_size);
1772 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1773 error = setattr_chown(inode, attr);
1774 else {
1775 error = gfs2_setattr_simple(inode, attr);
1776 if (!error && attr->ia_valid & ATTR_MODE)
1777 error = posix_acl_chmod(inode, inode->i_mode);
1778 }
1779
1780out:
1781 if (!error)
1782 mark_inode_dirty(inode);
1783 gfs2_glock_dq_uninit(&i_gh);
1784 return error;
1785}
1786
1787/**
1788 * gfs2_getattr - Read out an inode's attributes
1789 * @mnt: The vfsmount the inode is being accessed from
1790 * @dentry: The dentry to stat
1791 * @stat: The inode's stats
1792 *
1793 * This may be called from the VFS directly, or from within GFS2 with the
1794 * inode locked, so we look to see if the glock is already locked and only
1795 * lock the glock if its not already been done. Note that its the NFS
1796 * readdirplus operation which causes this to be called (from filldir)
1797 * with the glock already held.
1798 *
1799 * Returns: errno
1800 */
1801
1802static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1803 struct kstat *stat)
1804{
1805 struct inode *inode = dentry->d_inode;
1806 struct gfs2_inode *ip = GFS2_I(inode);
1807 struct gfs2_holder gh;
1808 int error;
1809 int unlock = 0;
1810
1811 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1812 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1813 if (error)
1814 return error;
1815 unlock = 1;
1816 }
1817
1818 generic_fillattr(inode, stat);
1819 if (unlock)
1820 gfs2_glock_dq_uninit(&gh);
1821
1822 return 0;
1823}
1824
1825static int gfs2_setxattr(struct dentry *dentry, const char *name,
1826 const void *data, size_t size, int flags)
1827{
1828 struct inode *inode = dentry->d_inode;
1829 struct gfs2_inode *ip = GFS2_I(inode);
1830 struct gfs2_holder gh;
1831 int ret;
1832
1833 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1834 ret = gfs2_glock_nq(&gh);
1835 if (ret == 0) {
1836 ret = gfs2_rs_alloc(ip);
1837 if (ret == 0)
1838 ret = generic_setxattr(dentry, name, data, size, flags);
1839 gfs2_glock_dq(&gh);
1840 }
1841 gfs2_holder_uninit(&gh);
1842 return ret;
1843}
1844
1845static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1846 void *data, size_t size)
1847{
1848 struct inode *inode = dentry->d_inode;
1849 struct gfs2_inode *ip = GFS2_I(inode);
1850 struct gfs2_holder gh;
1851 int ret;
1852
1853 /* For selinux during lookup */
1854 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1855 return generic_getxattr(dentry, name, data, size);
1856
1857 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1858 ret = gfs2_glock_nq(&gh);
1859 if (ret == 0) {
1860 ret = generic_getxattr(dentry, name, data, size);
1861 gfs2_glock_dq(&gh);
1862 }
1863 gfs2_holder_uninit(&gh);
1864 return ret;
1865}
1866
1867static int gfs2_removexattr(struct dentry *dentry, const char *name)
1868{
1869 struct inode *inode = dentry->d_inode;
1870 struct gfs2_inode *ip = GFS2_I(inode);
1871 struct gfs2_holder gh;
1872 int ret;
1873
1874 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1875 ret = gfs2_glock_nq(&gh);
1876 if (ret == 0) {
1877 ret = gfs2_rs_alloc(ip);
1878 if (ret == 0)
1879 ret = generic_removexattr(dentry, name);
1880 gfs2_glock_dq(&gh);
1881 }
1882 gfs2_holder_uninit(&gh);
1883 return ret;
1884}
1885
1886static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1887 u64 start, u64 len)
1888{
1889 struct gfs2_inode *ip = GFS2_I(inode);
1890 struct gfs2_holder gh;
1891 int ret;
1892
1893 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1894 if (ret)
1895 return ret;
1896
1897 mutex_lock(&inode->i_mutex);
1898
1899 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1900 if (ret)
1901 goto out;
1902
1903 if (gfs2_is_stuffed(ip)) {
1904 u64 phys = ip->i_no_addr << inode->i_blkbits;
1905 u64 size = i_size_read(inode);
1906 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1907 FIEMAP_EXTENT_DATA_INLINE;
1908 phys += sizeof(struct gfs2_dinode);
1909 phys += start;
1910 if (start + len > size)
1911 len = size - start;
1912 if (start < size)
1913 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1914 len, flags);
1915 if (ret == 1)
1916 ret = 0;
1917 } else {
1918 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1919 gfs2_block_map);
1920 }
1921
1922 gfs2_glock_dq_uninit(&gh);
1923out:
1924 mutex_unlock(&inode->i_mutex);
1925 return ret;
1926}
1927
1928const struct inode_operations gfs2_file_iops = {
1929 .permission = gfs2_permission,
1930 .setattr = gfs2_setattr,
1931 .getattr = gfs2_getattr,
1932 .setxattr = gfs2_setxattr,
1933 .getxattr = gfs2_getxattr,
1934 .listxattr = gfs2_listxattr,
1935 .removexattr = gfs2_removexattr,
1936 .fiemap = gfs2_fiemap,
1937 .get_acl = gfs2_get_acl,
1938 .set_acl = gfs2_set_acl,
1939};
1940
1941const struct inode_operations gfs2_dir_iops = {
1942 .create = gfs2_create,
1943 .lookup = gfs2_lookup,
1944 .link = gfs2_link,
1945 .unlink = gfs2_unlink,
1946 .symlink = gfs2_symlink,
1947 .mkdir = gfs2_mkdir,
1948 .rmdir = gfs2_unlink,
1949 .mknod = gfs2_mknod,
1950 .rename = gfs2_rename,
1951 .permission = gfs2_permission,
1952 .setattr = gfs2_setattr,
1953 .getattr = gfs2_getattr,
1954 .setxattr = gfs2_setxattr,
1955 .getxattr = gfs2_getxattr,
1956 .listxattr = gfs2_listxattr,
1957 .removexattr = gfs2_removexattr,
1958 .fiemap = gfs2_fiemap,
1959 .get_acl = gfs2_get_acl,
1960 .set_acl = gfs2_set_acl,
1961 .atomic_open = gfs2_atomic_open,
1962};
1963
1964const struct inode_operations gfs2_symlink_iops = {
1965 .readlink = generic_readlink,
1966 .follow_link = gfs2_follow_link,
1967 .put_link = kfree_put_link,
1968 .permission = gfs2_permission,
1969 .setattr = gfs2_setattr,
1970 .getattr = gfs2_getattr,
1971 .setxattr = gfs2_setxattr,
1972 .getxattr = gfs2_getxattr,
1973 .listxattr = gfs2_listxattr,
1974 .removexattr = gfs2_removexattr,
1975 .fiemap = gfs2_fiemap,
1976};
1977
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 int iget_test(struct inode *inode, void *opaque)
40{
41 u64 no_addr = *(u64 *)opaque;
42
43 return GFS2_I(inode)->i_no_addr == no_addr;
44}
45
46static int iget_set(struct inode *inode, void *opaque)
47{
48 u64 no_addr = *(u64 *)opaque;
49
50 GFS2_I(inode)->i_no_addr = no_addr;
51 inode->i_ino = no_addr;
52 return 0;
53}
54
55static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
56{
57 struct inode *inode;
58
59repeat:
60 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
61 if (!inode)
62 return inode;
63 if (is_bad_inode(inode)) {
64 iput(inode);
65 goto repeat;
66 }
67 return inode;
68}
69
70/**
71 * gfs2_set_iop - Sets inode operations
72 * @inode: The inode with correct i_mode filled in
73 *
74 * GFS2 lookup code fills in vfs inode contents based on info obtained
75 * from directory entry inside gfs2_inode_lookup().
76 */
77
78static void gfs2_set_iop(struct inode *inode)
79{
80 struct gfs2_sbd *sdp = GFS2_SB(inode);
81 umode_t mode = inode->i_mode;
82
83 if (S_ISREG(mode)) {
84 inode->i_op = &gfs2_file_iops;
85 if (gfs2_localflocks(sdp))
86 inode->i_fop = &gfs2_file_fops_nolock;
87 else
88 inode->i_fop = &gfs2_file_fops;
89 } else if (S_ISDIR(mode)) {
90 inode->i_op = &gfs2_dir_iops;
91 if (gfs2_localflocks(sdp))
92 inode->i_fop = &gfs2_dir_fops_nolock;
93 else
94 inode->i_fop = &gfs2_dir_fops;
95 } else if (S_ISLNK(mode)) {
96 inode->i_op = &gfs2_symlink_iops;
97 } else {
98 inode->i_op = &gfs2_file_iops;
99 init_special_inode(inode, inode->i_mode, inode->i_rdev);
100 }
101}
102
103/**
104 * gfs2_inode_lookup - Lookup an inode
105 * @sb: The super block
106 * @type: The type of the inode
107 * @no_addr: The inode number
108 * @no_formal_ino: The inode generation number
109 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
110 * GFS2_BLKST_FREE to indicate not to verify)
111 *
112 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
113 *
114 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
115 * placeholder because it doesn't otherwise make sense), the on-disk block type
116 * is verified to be @blktype.
117 *
118 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
119 * if it detects that @no_formal_ino doesn't match the actual inode generation
120 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
121 *
122 * Returns: A VFS inode, or an error
123 */
124
125struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
126 u64 no_addr, u64 no_formal_ino,
127 unsigned int blktype)
128{
129 struct inode *inode;
130 struct gfs2_inode *ip;
131 struct gfs2_glock *io_gl = NULL;
132 struct gfs2_holder i_gh;
133 int error;
134
135 gfs2_holder_mark_uninitialized(&i_gh);
136 inode = gfs2_iget(sb, no_addr);
137 if (!inode)
138 return ERR_PTR(-ENOMEM);
139
140 ip = GFS2_I(inode);
141
142 if (inode->i_state & I_NEW) {
143 struct gfs2_sbd *sdp = GFS2_SB(inode);
144
145 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
146 if (unlikely(error))
147 goto fail;
148 flush_delayed_work(&ip->i_gl->gl_work);
149
150 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
151 if (unlikely(error))
152 goto fail;
153
154 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
155 /*
156 * The GL_SKIP flag indicates to skip reading the inode
157 * block. We read the inode with gfs2_inode_refresh
158 * after possibly checking the block type.
159 */
160 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
161 GL_SKIP, &i_gh);
162 if (error)
163 goto fail;
164
165 error = -ESTALE;
166 if (no_formal_ino &&
167 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
168 goto fail;
169
170 if (blktype != GFS2_BLKST_FREE) {
171 error = gfs2_check_blk_type(sdp, no_addr,
172 blktype);
173 if (error)
174 goto fail;
175 }
176 }
177
178 glock_set_object(ip->i_gl, ip);
179 set_bit(GIF_INVALID, &ip->i_flags);
180 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
181 if (unlikely(error))
182 goto fail;
183 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
184 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
185 gfs2_glock_put(io_gl);
186 io_gl = NULL;
187
188 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
189 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
190 inode->i_atime.tv_nsec = 0;
191
192 if (type == DT_UNKNOWN) {
193 /* Inode glock must be locked already */
194 error = gfs2_inode_refresh(GFS2_I(inode));
195 if (error)
196 goto fail;
197 } else {
198 ip->i_no_formal_ino = no_formal_ino;
199 inode->i_mode = DT2IF(type);
200 }
201
202 if (gfs2_holder_initialized(&i_gh))
203 gfs2_glock_dq_uninit(&i_gh);
204
205 gfs2_set_iop(inode);
206 }
207
208 if (no_formal_ino && ip->i_no_formal_ino &&
209 no_formal_ino != ip->i_no_formal_ino) {
210 error = -ESTALE;
211 if (inode->i_state & I_NEW)
212 goto fail;
213 iput(inode);
214 return ERR_PTR(error);
215 }
216
217 if (inode->i_state & I_NEW)
218 unlock_new_inode(inode);
219
220 return inode;
221
222fail:
223 if (io_gl)
224 gfs2_glock_put(io_gl);
225 if (gfs2_holder_initialized(&i_gh))
226 gfs2_glock_dq_uninit(&i_gh);
227 iget_failed(inode);
228 return ERR_PTR(error);
229}
230
231/**
232 * gfs2_lookup_by_inum - look up an inode by inode number
233 * @sdp: The super block
234 * @no_addr: The inode number
235 * @no_formal_ino: The inode generation number (0 for any)
236 * @blktype: Requested block type (see gfs2_inode_lookup)
237 */
238struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
239 u64 no_formal_ino, unsigned int blktype)
240{
241 struct super_block *sb = sdp->sd_vfs;
242 struct inode *inode;
243 int error;
244
245 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
246 blktype);
247 if (IS_ERR(inode))
248 return inode;
249
250 if (no_formal_ino) {
251 error = -EIO;
252 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
253 goto fail_iput;
254 }
255 return inode;
256
257fail_iput:
258 iput(inode);
259 return ERR_PTR(error);
260}
261
262
263struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
264{
265 struct qstr qstr;
266 struct inode *inode;
267 gfs2_str2qstr(&qstr, name);
268 inode = gfs2_lookupi(dip, &qstr, 1);
269 /* gfs2_lookupi has inconsistent callers: vfs
270 * related routines expect NULL for no entry found,
271 * gfs2_lookup_simple callers expect ENOENT
272 * and do not check for NULL.
273 */
274 if (inode == NULL)
275 return ERR_PTR(-ENOENT);
276 else
277 return inode;
278}
279
280
281/**
282 * gfs2_lookupi - Look up a filename in a directory and return its inode
283 * @d_gh: An initialized holder for the directory glock
284 * @name: The name of the inode to look for
285 * @is_root: If 1, ignore the caller's permissions
286 * @i_gh: An uninitialized holder for the new inode glock
287 *
288 * This can be called via the VFS filldir function when NFS is doing
289 * a readdirplus and the inode which its intending to stat isn't
290 * already in cache. In this case we must not take the directory glock
291 * again, since the readdir call will have already taken that lock.
292 *
293 * Returns: errno
294 */
295
296struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
297 int is_root)
298{
299 struct super_block *sb = dir->i_sb;
300 struct gfs2_inode *dip = GFS2_I(dir);
301 struct gfs2_holder d_gh;
302 int error = 0;
303 struct inode *inode = NULL;
304
305 gfs2_holder_mark_uninitialized(&d_gh);
306 if (!name->len || name->len > GFS2_FNAMESIZE)
307 return ERR_PTR(-ENAMETOOLONG);
308
309 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
310 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
311 dir == d_inode(sb->s_root))) {
312 igrab(dir);
313 return dir;
314 }
315
316 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
317 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
318 if (error)
319 return ERR_PTR(error);
320 }
321
322 if (!is_root) {
323 error = gfs2_permission(dir, MAY_EXEC);
324 if (error)
325 goto out;
326 }
327
328 inode = gfs2_dir_search(dir, name, false);
329 if (IS_ERR(inode))
330 error = PTR_ERR(inode);
331out:
332 if (gfs2_holder_initialized(&d_gh))
333 gfs2_glock_dq_uninit(&d_gh);
334 if (error == -ENOENT)
335 return NULL;
336 return inode ? inode : ERR_PTR(error);
337}
338
339/**
340 * create_ok - OK to create a new on-disk inode here?
341 * @dip: Directory in which dinode is to be created
342 * @name: Name of new dinode
343 * @mode:
344 *
345 * Returns: errno
346 */
347
348static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
349 umode_t mode)
350{
351 int error;
352
353 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
354 if (error)
355 return error;
356
357 /* Don't create entries in an unlinked directory */
358 if (!dip->i_inode.i_nlink)
359 return -ENOENT;
360
361 if (dip->i_entries == (u32)-1)
362 return -EFBIG;
363 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
364 return -EMLINK;
365
366 return 0;
367}
368
369static void munge_mode_uid_gid(const struct gfs2_inode *dip,
370 struct inode *inode)
371{
372 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
373 (dip->i_inode.i_mode & S_ISUID) &&
374 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
375 if (S_ISDIR(inode->i_mode))
376 inode->i_mode |= S_ISUID;
377 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
378 inode->i_mode &= ~07111;
379 inode->i_uid = dip->i_inode.i_uid;
380 } else
381 inode->i_uid = current_fsuid();
382
383 if (dip->i_inode.i_mode & S_ISGID) {
384 if (S_ISDIR(inode->i_mode))
385 inode->i_mode |= S_ISGID;
386 inode->i_gid = dip->i_inode.i_gid;
387 } else
388 inode->i_gid = current_fsgid();
389}
390
391static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
392{
393 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
394 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
395 int error;
396
397 error = gfs2_quota_lock_check(ip, &ap);
398 if (error)
399 goto out;
400
401 error = gfs2_inplace_reserve(ip, &ap);
402 if (error)
403 goto out_quota;
404
405 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
406 if (error)
407 goto out_ipreserv;
408
409 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
410 ip->i_no_formal_ino = ip->i_generation;
411 ip->i_inode.i_ino = ip->i_no_addr;
412 ip->i_goal = ip->i_no_addr;
413
414 gfs2_trans_end(sdp);
415
416out_ipreserv:
417 gfs2_inplace_release(ip);
418out_quota:
419 gfs2_quota_unlock(ip);
420out:
421 return error;
422}
423
424static void gfs2_init_dir(struct buffer_head *dibh,
425 const struct gfs2_inode *parent)
426{
427 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
428 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
429
430 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
431 dent->de_inum = di->di_num; /* already GFS2 endian */
432 dent->de_type = cpu_to_be16(DT_DIR);
433
434 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
435 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
436 gfs2_inum_out(parent, dent);
437 dent->de_type = cpu_to_be16(DT_DIR);
438
439}
440
441/**
442 * gfs2_init_xattr - Initialise an xattr block for a new inode
443 * @ip: The inode in question
444 *
445 * This sets up an empty xattr block for a new inode, ready to
446 * take any ACLs, LSM xattrs, etc.
447 */
448
449static void gfs2_init_xattr(struct gfs2_inode *ip)
450{
451 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
452 struct buffer_head *bh;
453 struct gfs2_ea_header *ea;
454
455 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
456 gfs2_trans_add_meta(ip->i_gl, bh);
457 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
458 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
459
460 ea = GFS2_EA_BH2FIRST(bh);
461 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
462 ea->ea_type = GFS2_EATYPE_UNUSED;
463 ea->ea_flags = GFS2_EAFLAG_LAST;
464
465 brelse(bh);
466}
467
468/**
469 * init_dinode - Fill in a new dinode structure
470 * @dip: The directory this inode is being created in
471 * @ip: The inode
472 * @symname: The symlink destination (if a symlink)
473 * @bhp: The buffer head (returned to caller)
474 *
475 */
476
477static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
478 const char *symname)
479{
480 struct gfs2_dinode *di;
481 struct buffer_head *dibh;
482
483 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
484 gfs2_trans_add_meta(ip->i_gl, dibh);
485 di = (struct gfs2_dinode *)dibh->b_data;
486 gfs2_dinode_out(ip, di);
487
488 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
489 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
490 di->__pad1 = 0;
491 di->__pad2 = 0;
492 di->__pad3 = 0;
493 memset(&di->__pad4, 0, sizeof(di->__pad4));
494 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
495 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
496
497 switch(ip->i_inode.i_mode & S_IFMT) {
498 case S_IFDIR:
499 gfs2_init_dir(dibh, dip);
500 break;
501 case S_IFLNK:
502 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
503 break;
504 }
505
506 set_buffer_uptodate(dibh);
507 brelse(dibh);
508}
509
510/**
511 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
512 * @dip: The directory we are linking into
513 * @da: The dir add information
514 * @nr_inodes: The number of inodes involved
515 *
516 * This calculate the number of blocks we need to reserve in a
517 * transaction to link @nr_inodes into a directory. In most cases
518 * @nr_inodes will be 2 (the directory plus the inode being linked in)
519 * but in case of rename, 4 may be required.
520 *
521 * Returns: Number of blocks
522 */
523
524static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
525 const struct gfs2_diradd *da,
526 unsigned nr_inodes)
527{
528 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
529 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
530}
531
532static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
533 struct gfs2_inode *ip, struct gfs2_diradd *da)
534{
535 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
536 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
537 int error;
538
539 if (da->nr_blocks) {
540 error = gfs2_quota_lock_check(dip, &ap);
541 if (error)
542 goto fail_quota_locks;
543
544 error = gfs2_inplace_reserve(dip, &ap);
545 if (error)
546 goto fail_quota_locks;
547
548 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
549 if (error)
550 goto fail_ipreserv;
551 } else {
552 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
553 if (error)
554 goto fail_quota_locks;
555 }
556
557 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
558
559 gfs2_trans_end(sdp);
560fail_ipreserv:
561 gfs2_inplace_release(dip);
562fail_quota_locks:
563 gfs2_quota_unlock(dip);
564 return error;
565}
566
567static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
568 void *fs_info)
569{
570 const struct xattr *xattr;
571 int err = 0;
572
573 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
574 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
575 xattr->value_len, 0,
576 GFS2_EATYPE_SECURITY);
577 if (err < 0)
578 break;
579 }
580 return err;
581}
582
583/**
584 * gfs2_create_inode - Create a new inode
585 * @dir: The parent directory
586 * @dentry: The new dentry
587 * @file: If non-NULL, the file which is being opened
588 * @mode: The permissions on the new inode
589 * @dev: For device nodes, this is the device number
590 * @symname: For symlinks, this is the link destination
591 * @size: The initial size of the inode (ignored for directories)
592 *
593 * Returns: 0 on success, or error code
594 */
595
596static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
597 struct file *file,
598 umode_t mode, dev_t dev, const char *symname,
599 unsigned int size, int excl)
600{
601 const struct qstr *name = &dentry->d_name;
602 struct posix_acl *default_acl, *acl;
603 struct gfs2_holder ghs[2];
604 struct inode *inode = NULL;
605 struct gfs2_inode *dip = GFS2_I(dir), *ip;
606 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
607 struct gfs2_glock *io_gl = NULL;
608 int error, free_vfs_inode = 1;
609 u32 aflags = 0;
610 unsigned blocks = 1;
611 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
612
613 if (!name->len || name->len > GFS2_FNAMESIZE)
614 return -ENAMETOOLONG;
615
616 error = gfs2_qa_get(dip);
617 if (error)
618 return error;
619
620 error = gfs2_rindex_update(sdp);
621 if (error)
622 goto fail;
623
624 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
625 if (error)
626 goto fail;
627 gfs2_holder_mark_uninitialized(ghs + 1);
628
629 error = create_ok(dip, name, mode);
630 if (error)
631 goto fail_gunlock;
632
633 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
634 error = PTR_ERR(inode);
635 if (!IS_ERR(inode)) {
636 if (S_ISDIR(inode->i_mode)) {
637 iput(inode);
638 inode = ERR_PTR(-EISDIR);
639 goto fail_gunlock;
640 }
641 d_instantiate(dentry, inode);
642 error = 0;
643 if (file) {
644 if (S_ISREG(inode->i_mode))
645 error = finish_open(file, dentry, gfs2_open_common);
646 else
647 error = finish_no_open(file, NULL);
648 }
649 gfs2_glock_dq_uninit(ghs);
650 goto fail;
651 } else if (error != -ENOENT) {
652 goto fail_gunlock;
653 }
654
655 error = gfs2_diradd_alloc_required(dir, name, &da);
656 if (error < 0)
657 goto fail_gunlock;
658
659 inode = new_inode(sdp->sd_vfs);
660 error = -ENOMEM;
661 if (!inode)
662 goto fail_gunlock;
663
664 error = posix_acl_create(dir, &mode, &default_acl, &acl);
665 if (error)
666 goto fail_gunlock;
667
668 ip = GFS2_I(inode);
669 error = gfs2_qa_get(ip);
670 if (error)
671 goto fail_free_acls;
672
673 inode->i_mode = mode;
674 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
675 inode->i_rdev = dev;
676 inode->i_size = size;
677 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
678 munge_mode_uid_gid(dip, inode);
679 check_and_update_goal(dip);
680 ip->i_goal = dip->i_goal;
681 ip->i_diskflags = 0;
682 ip->i_eattr = 0;
683 ip->i_height = 0;
684 ip->i_depth = 0;
685 ip->i_entries = 0;
686 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
687
688 switch(mode & S_IFMT) {
689 case S_IFREG:
690 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
691 gfs2_tune_get(sdp, gt_new_files_jdata))
692 ip->i_diskflags |= GFS2_DIF_JDATA;
693 gfs2_set_aops(inode);
694 break;
695 case S_IFDIR:
696 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
697 ip->i_diskflags |= GFS2_DIF_JDATA;
698 ip->i_entries = 2;
699 break;
700 }
701
702 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
703 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
704 ip->i_diskflags |= GFS2_DIF_SYSTEM;
705
706 gfs2_set_inode_flags(inode);
707
708 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
709 (dip->i_diskflags & GFS2_DIF_TOPDIR))
710 aflags |= GFS2_AF_ORLOV;
711
712 if (default_acl || acl)
713 blocks++;
714
715 error = alloc_dinode(ip, aflags, &blocks);
716 if (error)
717 goto fail_free_inode;
718
719 gfs2_set_inode_blocks(inode, blocks);
720
721 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
722 if (error)
723 goto fail_free_inode;
724 flush_delayed_work(&ip->i_gl->gl_work);
725 glock_set_object(ip->i_gl, ip);
726
727 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
728 if (error)
729 goto fail_free_inode;
730
731 error = gfs2_trans_begin(sdp, blocks, 0);
732 if (error)
733 goto fail_free_inode;
734
735 if (blocks > 1) {
736 ip->i_eattr = ip->i_no_addr + 1;
737 gfs2_init_xattr(ip);
738 }
739 init_dinode(dip, ip, symname);
740 gfs2_trans_end(sdp);
741
742 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
743 if (error)
744 goto fail_free_inode;
745
746 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
747
748 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
749 if (error)
750 goto fail_gunlock2;
751
752 gfs2_cancel_delete_work(ip->i_iopen_gh.gh_gl);
753 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
754 gfs2_set_iop(inode);
755 insert_inode_hash(inode);
756
757 free_vfs_inode = 0; /* After this point, the inode is no longer
758 considered free. Any failures need to undo
759 the gfs2 structures. */
760 if (default_acl) {
761 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
762 if (error)
763 goto fail_gunlock3;
764 posix_acl_release(default_acl);
765 default_acl = NULL;
766 }
767 if (acl) {
768 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
769 if (error)
770 goto fail_gunlock3;
771 posix_acl_release(acl);
772 acl = NULL;
773 }
774
775 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
776 &gfs2_initxattrs, NULL);
777 if (error)
778 goto fail_gunlock3;
779
780 error = link_dinode(dip, name, ip, &da);
781 if (error)
782 goto fail_gunlock3;
783
784 mark_inode_dirty(inode);
785 d_instantiate(dentry, inode);
786 /* After instantiate, errors should result in evict which will destroy
787 * both inode and iopen glocks properly. */
788 if (file) {
789 file->f_mode |= FMODE_CREATED;
790 error = finish_open(file, dentry, gfs2_open_common);
791 }
792 gfs2_glock_dq_uninit(ghs);
793 gfs2_qa_put(ip);
794 gfs2_glock_dq_uninit(ghs + 1);
795 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
796 gfs2_glock_put(io_gl);
797 gfs2_qa_put(dip);
798 return error;
799
800fail_gunlock3:
801 glock_clear_object(io_gl, ip);
802 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
803fail_gunlock2:
804 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
805 gfs2_glock_put(io_gl);
806fail_free_inode:
807 if (ip->i_gl) {
808 glock_clear_object(ip->i_gl, ip);
809 if (free_vfs_inode) /* else evict will do the put for us */
810 gfs2_glock_put(ip->i_gl);
811 }
812 gfs2_rs_delete(ip, NULL);
813 gfs2_qa_put(ip);
814fail_free_acls:
815 posix_acl_release(default_acl);
816 posix_acl_release(acl);
817fail_gunlock:
818 gfs2_dir_no_add(&da);
819 gfs2_glock_dq_uninit(ghs);
820 if (!IS_ERR_OR_NULL(inode)) {
821 clear_nlink(inode);
822 if (!free_vfs_inode)
823 mark_inode_dirty(inode);
824 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
825 &GFS2_I(inode)->i_flags);
826 iput(inode);
827 }
828 if (gfs2_holder_initialized(ghs + 1))
829 gfs2_glock_dq_uninit(ghs + 1);
830fail:
831 gfs2_qa_put(dip);
832 return error;
833}
834
835/**
836 * gfs2_create - Create a file
837 * @dir: The directory in which to create the file
838 * @dentry: The dentry of the new file
839 * @mode: The mode of the new file
840 *
841 * Returns: errno
842 */
843
844static int gfs2_create(struct inode *dir, struct dentry *dentry,
845 umode_t mode, bool excl)
846{
847 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
848}
849
850/**
851 * __gfs2_lookup - Look up a filename in a directory and return its inode
852 * @dir: The directory inode
853 * @dentry: The dentry of the new inode
854 * @file: File to be opened
855 *
856 *
857 * Returns: errno
858 */
859
860static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
861 struct file *file)
862{
863 struct inode *inode;
864 struct dentry *d;
865 struct gfs2_holder gh;
866 struct gfs2_glock *gl;
867 int error;
868
869 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
870 if (inode == NULL) {
871 d_add(dentry, NULL);
872 return NULL;
873 }
874 if (IS_ERR(inode))
875 return ERR_CAST(inode);
876
877 gl = GFS2_I(inode)->i_gl;
878 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
879 if (error) {
880 iput(inode);
881 return ERR_PTR(error);
882 }
883
884 d = d_splice_alias(inode, dentry);
885 if (IS_ERR(d)) {
886 gfs2_glock_dq_uninit(&gh);
887 return d;
888 }
889 if (file && S_ISREG(inode->i_mode))
890 error = finish_open(file, dentry, gfs2_open_common);
891
892 gfs2_glock_dq_uninit(&gh);
893 if (error) {
894 dput(d);
895 return ERR_PTR(error);
896 }
897 return d;
898}
899
900static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
901 unsigned flags)
902{
903 return __gfs2_lookup(dir, dentry, NULL);
904}
905
906/**
907 * gfs2_link - Link to a file
908 * @old_dentry: The inode to link
909 * @dir: Add link to this directory
910 * @dentry: The name of the link
911 *
912 * Link the inode in "old_dentry" into the directory "dir" with the
913 * name in "dentry".
914 *
915 * Returns: errno
916 */
917
918static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
919 struct dentry *dentry)
920{
921 struct gfs2_inode *dip = GFS2_I(dir);
922 struct gfs2_sbd *sdp = GFS2_SB(dir);
923 struct inode *inode = d_inode(old_dentry);
924 struct gfs2_inode *ip = GFS2_I(inode);
925 struct gfs2_holder ghs[2];
926 struct buffer_head *dibh;
927 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
928 int error;
929
930 if (S_ISDIR(inode->i_mode))
931 return -EPERM;
932
933 error = gfs2_qa_get(dip);
934 if (error)
935 return error;
936
937 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
938 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
939
940 error = gfs2_glock_nq(ghs); /* parent */
941 if (error)
942 goto out_parent;
943
944 error = gfs2_glock_nq(ghs + 1); /* child */
945 if (error)
946 goto out_child;
947
948 error = -ENOENT;
949 if (inode->i_nlink == 0)
950 goto out_gunlock;
951
952 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
953 if (error)
954 goto out_gunlock;
955
956 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
957 switch (error) {
958 case -ENOENT:
959 break;
960 case 0:
961 error = -EEXIST;
962 default:
963 goto out_gunlock;
964 }
965
966 error = -EINVAL;
967 if (!dip->i_inode.i_nlink)
968 goto out_gunlock;
969 error = -EFBIG;
970 if (dip->i_entries == (u32)-1)
971 goto out_gunlock;
972 error = -EPERM;
973 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
974 goto out_gunlock;
975 error = -EINVAL;
976 if (!ip->i_inode.i_nlink)
977 goto out_gunlock;
978 error = -EMLINK;
979 if (ip->i_inode.i_nlink == (u32)-1)
980 goto out_gunlock;
981
982 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
983 if (error < 0)
984 goto out_gunlock;
985
986 if (da.nr_blocks) {
987 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
988 error = gfs2_quota_lock_check(dip, &ap);
989 if (error)
990 goto out_gunlock;
991
992 error = gfs2_inplace_reserve(dip, &ap);
993 if (error)
994 goto out_gunlock_q;
995
996 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
997 if (error)
998 goto out_ipres;
999 } else {
1000 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1001 if (error)
1002 goto out_ipres;
1003 }
1004
1005 error = gfs2_meta_inode_buffer(ip, &dibh);
1006 if (error)
1007 goto out_end_trans;
1008
1009 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1010 if (error)
1011 goto out_brelse;
1012
1013 gfs2_trans_add_meta(ip->i_gl, dibh);
1014 inc_nlink(&ip->i_inode);
1015 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1016 ihold(inode);
1017 d_instantiate(dentry, inode);
1018 mark_inode_dirty(inode);
1019
1020out_brelse:
1021 brelse(dibh);
1022out_end_trans:
1023 gfs2_trans_end(sdp);
1024out_ipres:
1025 if (da.nr_blocks)
1026 gfs2_inplace_release(dip);
1027out_gunlock_q:
1028 if (da.nr_blocks)
1029 gfs2_quota_unlock(dip);
1030out_gunlock:
1031 gfs2_dir_no_add(&da);
1032 gfs2_glock_dq(ghs + 1);
1033out_child:
1034 gfs2_glock_dq(ghs);
1035out_parent:
1036 gfs2_qa_put(dip);
1037 gfs2_holder_uninit(ghs);
1038 gfs2_holder_uninit(ghs + 1);
1039 return error;
1040}
1041
1042/*
1043 * gfs2_unlink_ok - check to see that a inode is still in a directory
1044 * @dip: the directory
1045 * @name: the name of the file
1046 * @ip: the inode
1047 *
1048 * Assumes that the lock on (at least) @dip is held.
1049 *
1050 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1051 */
1052
1053static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1054 const struct gfs2_inode *ip)
1055{
1056 int error;
1057
1058 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1059 return -EPERM;
1060
1061 if ((dip->i_inode.i_mode & S_ISVTX) &&
1062 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1063 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1064 return -EPERM;
1065
1066 if (IS_APPEND(&dip->i_inode))
1067 return -EPERM;
1068
1069 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1070 if (error)
1071 return error;
1072
1073 return gfs2_dir_check(&dip->i_inode, name, ip);
1074}
1075
1076/**
1077 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1078 * @dip: The parent directory
1079 * @name: The name of the entry in the parent directory
1080 * @inode: The inode to be removed
1081 *
1082 * Called with all the locks and in a transaction. This will only be
1083 * called for a directory after it has been checked to ensure it is empty.
1084 *
1085 * Returns: 0 on success, or an error
1086 */
1087
1088static int gfs2_unlink_inode(struct gfs2_inode *dip,
1089 const struct dentry *dentry)
1090{
1091 struct inode *inode = d_inode(dentry);
1092 struct gfs2_inode *ip = GFS2_I(inode);
1093 int error;
1094
1095 error = gfs2_dir_del(dip, dentry);
1096 if (error)
1097 return error;
1098
1099 ip->i_entries = 0;
1100 inode->i_ctime = current_time(inode);
1101 if (S_ISDIR(inode->i_mode))
1102 clear_nlink(inode);
1103 else
1104 drop_nlink(inode);
1105 mark_inode_dirty(inode);
1106 if (inode->i_nlink == 0)
1107 gfs2_unlink_di(inode);
1108 return 0;
1109}
1110
1111
1112/**
1113 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1114 * @dir: The inode of the directory containing the inode to unlink
1115 * @dentry: The file itself
1116 *
1117 * This routine uses the type of the inode as a flag to figure out
1118 * whether this is an unlink or an rmdir.
1119 *
1120 * Returns: errno
1121 */
1122
1123static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1124{
1125 struct gfs2_inode *dip = GFS2_I(dir);
1126 struct gfs2_sbd *sdp = GFS2_SB(dir);
1127 struct inode *inode = d_inode(dentry);
1128 struct gfs2_inode *ip = GFS2_I(inode);
1129 struct gfs2_holder ghs[3];
1130 struct gfs2_rgrpd *rgd;
1131 int error;
1132
1133 error = gfs2_rindex_update(sdp);
1134 if (error)
1135 return error;
1136
1137 error = -EROFS;
1138
1139 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1140 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1141
1142 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1143 if (!rgd)
1144 goto out_inodes;
1145
1146 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1147
1148
1149 error = gfs2_glock_nq(ghs); /* parent */
1150 if (error)
1151 goto out_parent;
1152
1153 error = gfs2_glock_nq(ghs + 1); /* child */
1154 if (error)
1155 goto out_child;
1156
1157 error = -ENOENT;
1158 if (inode->i_nlink == 0)
1159 goto out_rgrp;
1160
1161 if (S_ISDIR(inode->i_mode)) {
1162 error = -ENOTEMPTY;
1163 if (ip->i_entries > 2 || inode->i_nlink > 2)
1164 goto out_rgrp;
1165 }
1166
1167 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1168 if (error)
1169 goto out_rgrp;
1170
1171 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1172 if (error)
1173 goto out_gunlock;
1174
1175 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1176 if (error)
1177 goto out_gunlock;
1178
1179 error = gfs2_unlink_inode(dip, dentry);
1180 gfs2_trans_end(sdp);
1181
1182out_gunlock:
1183 gfs2_glock_dq(ghs + 2);
1184out_rgrp:
1185 gfs2_glock_dq(ghs + 1);
1186out_child:
1187 gfs2_glock_dq(ghs);
1188out_parent:
1189 gfs2_holder_uninit(ghs + 2);
1190out_inodes:
1191 gfs2_holder_uninit(ghs + 1);
1192 gfs2_holder_uninit(ghs);
1193 return error;
1194}
1195
1196/**
1197 * gfs2_symlink - Create a symlink
1198 * @dir: The directory to create the symlink in
1199 * @dentry: The dentry to put the symlink in
1200 * @symname: The thing which the link points to
1201 *
1202 * Returns: errno
1203 */
1204
1205static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1206 const char *symname)
1207{
1208 unsigned int size;
1209
1210 size = strlen(symname);
1211 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1212 return -ENAMETOOLONG;
1213
1214 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1215}
1216
1217/**
1218 * gfs2_mkdir - Make a directory
1219 * @dir: The parent directory of the new one
1220 * @dentry: The dentry of the new directory
1221 * @mode: The mode of the new directory
1222 *
1223 * Returns: errno
1224 */
1225
1226static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1227{
1228 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1229 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1230}
1231
1232/**
1233 * gfs2_mknod - Make a special file
1234 * @dir: The directory in which the special file will reside
1235 * @dentry: The dentry of the special file
1236 * @mode: The mode of the special file
1237 * @dev: The device specification of the special file
1238 *
1239 */
1240
1241static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1242 dev_t dev)
1243{
1244 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1245}
1246
1247/**
1248 * gfs2_atomic_open - Atomically open a file
1249 * @dir: The directory
1250 * @dentry: The proposed new entry
1251 * @file: The proposed new struct file
1252 * @flags: open flags
1253 * @mode: File mode
1254 *
1255 * Returns: error code or 0 for success
1256 */
1257
1258static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1259 struct file *file, unsigned flags,
1260 umode_t mode)
1261{
1262 struct dentry *d;
1263 bool excl = !!(flags & O_EXCL);
1264
1265 if (!d_in_lookup(dentry))
1266 goto skip_lookup;
1267
1268 d = __gfs2_lookup(dir, dentry, file);
1269 if (IS_ERR(d))
1270 return PTR_ERR(d);
1271 if (d != NULL)
1272 dentry = d;
1273 if (d_really_is_positive(dentry)) {
1274 if (!(file->f_mode & FMODE_OPENED))
1275 return finish_no_open(file, d);
1276 dput(d);
1277 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1278 }
1279
1280 BUG_ON(d != NULL);
1281
1282skip_lookup:
1283 if (!(flags & O_CREAT))
1284 return -ENOENT;
1285
1286 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1287}
1288
1289/*
1290 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1291 * @this: move this
1292 * @to: to here
1293 *
1294 * Follow @to back to the root and make sure we don't encounter @this
1295 * Assumes we already hold the rename lock.
1296 *
1297 * Returns: errno
1298 */
1299
1300static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1301{
1302 struct inode *dir = &to->i_inode;
1303 struct super_block *sb = dir->i_sb;
1304 struct inode *tmp;
1305 int error = 0;
1306
1307 igrab(dir);
1308
1309 for (;;) {
1310 if (dir == &this->i_inode) {
1311 error = -EINVAL;
1312 break;
1313 }
1314 if (dir == d_inode(sb->s_root)) {
1315 error = 0;
1316 break;
1317 }
1318
1319 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1320 if (!tmp) {
1321 error = -ENOENT;
1322 break;
1323 }
1324 if (IS_ERR(tmp)) {
1325 error = PTR_ERR(tmp);
1326 break;
1327 }
1328
1329 iput(dir);
1330 dir = tmp;
1331 }
1332
1333 iput(dir);
1334
1335 return error;
1336}
1337
1338/**
1339 * update_moved_ino - Update an inode that's being moved
1340 * @ip: The inode being moved
1341 * @ndip: The parent directory of the new filename
1342 * @dir_rename: True of ip is a directory
1343 *
1344 * Returns: errno
1345 */
1346
1347static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1348 int dir_rename)
1349{
1350 if (dir_rename)
1351 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1352
1353 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1354 mark_inode_dirty_sync(&ip->i_inode);
1355 return 0;
1356}
1357
1358
1359/**
1360 * gfs2_rename - Rename a file
1361 * @odir: Parent directory of old file name
1362 * @odentry: The old dentry of the file
1363 * @ndir: Parent directory of new file name
1364 * @ndentry: The new dentry of the file
1365 *
1366 * Returns: errno
1367 */
1368
1369static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1370 struct inode *ndir, struct dentry *ndentry)
1371{
1372 struct gfs2_inode *odip = GFS2_I(odir);
1373 struct gfs2_inode *ndip = GFS2_I(ndir);
1374 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1375 struct gfs2_inode *nip = NULL;
1376 struct gfs2_sbd *sdp = GFS2_SB(odir);
1377 struct gfs2_holder ghs[4], r_gh, rd_gh;
1378 struct gfs2_rgrpd *nrgd;
1379 unsigned int num_gh;
1380 int dir_rename = 0;
1381 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1382 unsigned int x;
1383 int error;
1384
1385 gfs2_holder_mark_uninitialized(&r_gh);
1386 gfs2_holder_mark_uninitialized(&rd_gh);
1387 if (d_really_is_positive(ndentry)) {
1388 nip = GFS2_I(d_inode(ndentry));
1389 if (ip == nip)
1390 return 0;
1391 }
1392
1393 error = gfs2_rindex_update(sdp);
1394 if (error)
1395 return error;
1396
1397 error = gfs2_qa_get(ndip);
1398 if (error)
1399 return error;
1400
1401 if (odip != ndip) {
1402 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1403 0, &r_gh);
1404 if (error)
1405 goto out;
1406
1407 if (S_ISDIR(ip->i_inode.i_mode)) {
1408 dir_rename = 1;
1409 /* don't move a directory into its subdir */
1410 error = gfs2_ok_to_move(ip, ndip);
1411 if (error)
1412 goto out_gunlock_r;
1413 }
1414 }
1415
1416 num_gh = 1;
1417 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1418 if (odip != ndip) {
1419 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1420 ghs + num_gh);
1421 num_gh++;
1422 }
1423 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1424 num_gh++;
1425
1426 if (nip) {
1427 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1428 ghs + num_gh);
1429 num_gh++;
1430 }
1431
1432 for (x = 0; x < num_gh; x++) {
1433 error = gfs2_glock_nq(ghs + x);
1434 if (error)
1435 goto out_gunlock;
1436 }
1437 error = gfs2_glock_async_wait(num_gh, ghs);
1438 if (error)
1439 goto out_gunlock;
1440
1441 if (nip) {
1442 /* Grab the resource group glock for unlink flag twiddling.
1443 * This is the case where the target dinode already exists
1444 * so we unlink before doing the rename.
1445 */
1446 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1447 if (!nrgd) {
1448 error = -ENOENT;
1449 goto out_gunlock;
1450 }
1451 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1452 &rd_gh);
1453 if (error)
1454 goto out_gunlock;
1455 }
1456
1457 error = -ENOENT;
1458 if (ip->i_inode.i_nlink == 0)
1459 goto out_gunlock;
1460
1461 /* Check out the old directory */
1462
1463 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1464 if (error)
1465 goto out_gunlock;
1466
1467 /* Check out the new directory */
1468
1469 if (nip) {
1470 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1471 if (error)
1472 goto out_gunlock;
1473
1474 if (nip->i_inode.i_nlink == 0) {
1475 error = -EAGAIN;
1476 goto out_gunlock;
1477 }
1478
1479 if (S_ISDIR(nip->i_inode.i_mode)) {
1480 if (nip->i_entries < 2) {
1481 gfs2_consist_inode(nip);
1482 error = -EIO;
1483 goto out_gunlock;
1484 }
1485 if (nip->i_entries > 2) {
1486 error = -ENOTEMPTY;
1487 goto out_gunlock;
1488 }
1489 }
1490 } else {
1491 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1492 if (error)
1493 goto out_gunlock;
1494
1495 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1496 switch (error) {
1497 case -ENOENT:
1498 error = 0;
1499 break;
1500 case 0:
1501 error = -EEXIST;
1502 default:
1503 goto out_gunlock;
1504 }
1505
1506 if (odip != ndip) {
1507 if (!ndip->i_inode.i_nlink) {
1508 error = -ENOENT;
1509 goto out_gunlock;
1510 }
1511 if (ndip->i_entries == (u32)-1) {
1512 error = -EFBIG;
1513 goto out_gunlock;
1514 }
1515 if (S_ISDIR(ip->i_inode.i_mode) &&
1516 ndip->i_inode.i_nlink == (u32)-1) {
1517 error = -EMLINK;
1518 goto out_gunlock;
1519 }
1520 }
1521 }
1522
1523 /* Check out the dir to be renamed */
1524
1525 if (dir_rename) {
1526 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1527 if (error)
1528 goto out_gunlock;
1529 }
1530
1531 if (nip == NULL) {
1532 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1533 if (error)
1534 goto out_gunlock;
1535 }
1536
1537 if (da.nr_blocks) {
1538 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1539 error = gfs2_quota_lock_check(ndip, &ap);
1540 if (error)
1541 goto out_gunlock;
1542
1543 error = gfs2_inplace_reserve(ndip, &ap);
1544 if (error)
1545 goto out_gunlock_q;
1546
1547 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1548 4 * RES_LEAF + 4, 0);
1549 if (error)
1550 goto out_ipreserv;
1551 } else {
1552 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1553 5 * RES_LEAF + 4, 0);
1554 if (error)
1555 goto out_gunlock;
1556 }
1557
1558 /* Remove the target file, if it exists */
1559
1560 if (nip)
1561 error = gfs2_unlink_inode(ndip, ndentry);
1562
1563 error = update_moved_ino(ip, ndip, dir_rename);
1564 if (error)
1565 goto out_end_trans;
1566
1567 error = gfs2_dir_del(odip, odentry);
1568 if (error)
1569 goto out_end_trans;
1570
1571 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1572 if (error)
1573 goto out_end_trans;
1574
1575out_end_trans:
1576 gfs2_trans_end(sdp);
1577out_ipreserv:
1578 if (da.nr_blocks)
1579 gfs2_inplace_release(ndip);
1580out_gunlock_q:
1581 if (da.nr_blocks)
1582 gfs2_quota_unlock(ndip);
1583out_gunlock:
1584 gfs2_dir_no_add(&da);
1585 if (gfs2_holder_initialized(&rd_gh))
1586 gfs2_glock_dq_uninit(&rd_gh);
1587
1588 while (x--) {
1589 if (gfs2_holder_queued(ghs + x))
1590 gfs2_glock_dq(ghs + x);
1591 gfs2_holder_uninit(ghs + x);
1592 }
1593out_gunlock_r:
1594 if (gfs2_holder_initialized(&r_gh))
1595 gfs2_glock_dq_uninit(&r_gh);
1596out:
1597 gfs2_qa_put(ndip);
1598 return error;
1599}
1600
1601/**
1602 * gfs2_exchange - exchange two files
1603 * @odir: Parent directory of old file name
1604 * @odentry: The old dentry of the file
1605 * @ndir: Parent directory of new file name
1606 * @ndentry: The new dentry of the file
1607 * @flags: The rename flags
1608 *
1609 * Returns: errno
1610 */
1611
1612static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1613 struct inode *ndir, struct dentry *ndentry,
1614 unsigned int flags)
1615{
1616 struct gfs2_inode *odip = GFS2_I(odir);
1617 struct gfs2_inode *ndip = GFS2_I(ndir);
1618 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1619 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1620 struct gfs2_sbd *sdp = GFS2_SB(odir);
1621 struct gfs2_holder ghs[4], r_gh;
1622 unsigned int num_gh;
1623 unsigned int x;
1624 umode_t old_mode = oip->i_inode.i_mode;
1625 umode_t new_mode = nip->i_inode.i_mode;
1626 int error;
1627
1628 gfs2_holder_mark_uninitialized(&r_gh);
1629 error = gfs2_rindex_update(sdp);
1630 if (error)
1631 return error;
1632
1633 if (odip != ndip) {
1634 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1635 0, &r_gh);
1636 if (error)
1637 goto out;
1638
1639 if (S_ISDIR(old_mode)) {
1640 /* don't move a directory into its subdir */
1641 error = gfs2_ok_to_move(oip, ndip);
1642 if (error)
1643 goto out_gunlock_r;
1644 }
1645
1646 if (S_ISDIR(new_mode)) {
1647 /* don't move a directory into its subdir */
1648 error = gfs2_ok_to_move(nip, odip);
1649 if (error)
1650 goto out_gunlock_r;
1651 }
1652 }
1653
1654 num_gh = 1;
1655 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1656 if (odip != ndip) {
1657 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1658 ghs + num_gh);
1659 num_gh++;
1660 }
1661 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1662 num_gh++;
1663
1664 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1665 num_gh++;
1666
1667 for (x = 0; x < num_gh; x++) {
1668 error = gfs2_glock_nq(ghs + x);
1669 if (error)
1670 goto out_gunlock;
1671 }
1672
1673 error = gfs2_glock_async_wait(num_gh, ghs);
1674 if (error)
1675 goto out_gunlock;
1676
1677 error = -ENOENT;
1678 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1679 goto out_gunlock;
1680
1681 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1682 if (error)
1683 goto out_gunlock;
1684 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1685 if (error)
1686 goto out_gunlock;
1687
1688 if (S_ISDIR(old_mode)) {
1689 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1690 if (error)
1691 goto out_gunlock;
1692 }
1693 if (S_ISDIR(new_mode)) {
1694 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1695 if (error)
1696 goto out_gunlock;
1697 }
1698 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1699 if (error)
1700 goto out_gunlock;
1701
1702 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1703 if (error)
1704 goto out_end_trans;
1705
1706 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1707 if (error)
1708 goto out_end_trans;
1709
1710 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1711 IF2DT(old_mode));
1712 if (error)
1713 goto out_end_trans;
1714
1715 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1716 IF2DT(new_mode));
1717 if (error)
1718 goto out_end_trans;
1719
1720 if (odip != ndip) {
1721 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1722 inc_nlink(&odip->i_inode);
1723 drop_nlink(&ndip->i_inode);
1724 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1725 inc_nlink(&ndip->i_inode);
1726 drop_nlink(&odip->i_inode);
1727 }
1728 }
1729 mark_inode_dirty(&ndip->i_inode);
1730 if (odip != ndip)
1731 mark_inode_dirty(&odip->i_inode);
1732
1733out_end_trans:
1734 gfs2_trans_end(sdp);
1735out_gunlock:
1736 while (x--) {
1737 if (gfs2_holder_queued(ghs + x))
1738 gfs2_glock_dq(ghs + x);
1739 gfs2_holder_uninit(ghs + x);
1740 }
1741out_gunlock_r:
1742 if (gfs2_holder_initialized(&r_gh))
1743 gfs2_glock_dq_uninit(&r_gh);
1744out:
1745 return error;
1746}
1747
1748static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1749 struct inode *ndir, struct dentry *ndentry,
1750 unsigned int flags)
1751{
1752 flags &= ~RENAME_NOREPLACE;
1753
1754 if (flags & ~RENAME_EXCHANGE)
1755 return -EINVAL;
1756
1757 if (flags & RENAME_EXCHANGE)
1758 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1759
1760 return gfs2_rename(odir, odentry, ndir, ndentry);
1761}
1762
1763/**
1764 * gfs2_get_link - Follow a symbolic link
1765 * @dentry: The dentry of the link
1766 * @inode: The inode of the link
1767 * @done: destructor for return value
1768 *
1769 * This can handle symlinks of any size.
1770 *
1771 * Returns: 0 on success or error code
1772 */
1773
1774static const char *gfs2_get_link(struct dentry *dentry,
1775 struct inode *inode,
1776 struct delayed_call *done)
1777{
1778 struct gfs2_inode *ip = GFS2_I(inode);
1779 struct gfs2_holder i_gh;
1780 struct buffer_head *dibh;
1781 unsigned int size;
1782 char *buf;
1783 int error;
1784
1785 if (!dentry)
1786 return ERR_PTR(-ECHILD);
1787
1788 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1789 error = gfs2_glock_nq(&i_gh);
1790 if (error) {
1791 gfs2_holder_uninit(&i_gh);
1792 return ERR_PTR(error);
1793 }
1794
1795 size = (unsigned int)i_size_read(&ip->i_inode);
1796 if (size == 0) {
1797 gfs2_consist_inode(ip);
1798 buf = ERR_PTR(-EIO);
1799 goto out;
1800 }
1801
1802 error = gfs2_meta_inode_buffer(ip, &dibh);
1803 if (error) {
1804 buf = ERR_PTR(error);
1805 goto out;
1806 }
1807
1808 buf = kzalloc(size + 1, GFP_NOFS);
1809 if (!buf)
1810 buf = ERR_PTR(-ENOMEM);
1811 else
1812 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1813 brelse(dibh);
1814out:
1815 gfs2_glock_dq_uninit(&i_gh);
1816 if (!IS_ERR(buf))
1817 set_delayed_call(done, kfree_link, buf);
1818 return buf;
1819}
1820
1821/**
1822 * gfs2_permission -
1823 * @inode: The inode
1824 * @mask: The mask to be tested
1825 * @flags: Indicates whether this is an RCU path walk or not
1826 *
1827 * This may be called from the VFS directly, or from within GFS2 with the
1828 * inode locked, so we look to see if the glock is already locked and only
1829 * lock the glock if its not already been done.
1830 *
1831 * Returns: errno
1832 */
1833
1834int gfs2_permission(struct inode *inode, int mask)
1835{
1836 struct gfs2_inode *ip;
1837 struct gfs2_holder i_gh;
1838 int error;
1839
1840 gfs2_holder_mark_uninitialized(&i_gh);
1841 ip = GFS2_I(inode);
1842 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1843 if (mask & MAY_NOT_BLOCK)
1844 return -ECHILD;
1845 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1846 if (error)
1847 return error;
1848 }
1849
1850 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1851 error = -EPERM;
1852 else
1853 error = generic_permission(inode, mask);
1854 if (gfs2_holder_initialized(&i_gh))
1855 gfs2_glock_dq_uninit(&i_gh);
1856
1857 return error;
1858}
1859
1860static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1861{
1862 setattr_copy(inode, attr);
1863 mark_inode_dirty(inode);
1864 return 0;
1865}
1866
1867/**
1868 * gfs2_setattr_simple -
1869 * @ip:
1870 * @attr:
1871 *
1872 * Returns: errno
1873 */
1874
1875int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1876{
1877 int error;
1878
1879 if (current->journal_info)
1880 return __gfs2_setattr_simple(inode, attr);
1881
1882 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1883 if (error)
1884 return error;
1885
1886 error = __gfs2_setattr_simple(inode, attr);
1887 gfs2_trans_end(GFS2_SB(inode));
1888 return error;
1889}
1890
1891static int setattr_chown(struct inode *inode, struct iattr *attr)
1892{
1893 struct gfs2_inode *ip = GFS2_I(inode);
1894 struct gfs2_sbd *sdp = GFS2_SB(inode);
1895 kuid_t ouid, nuid;
1896 kgid_t ogid, ngid;
1897 int error;
1898 struct gfs2_alloc_parms ap;
1899
1900 ouid = inode->i_uid;
1901 ogid = inode->i_gid;
1902 nuid = attr->ia_uid;
1903 ngid = attr->ia_gid;
1904
1905 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1906 ouid = nuid = NO_UID_QUOTA_CHANGE;
1907 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1908 ogid = ngid = NO_GID_QUOTA_CHANGE;
1909 error = gfs2_qa_get(ip);
1910 if (error)
1911 return error;
1912
1913 error = gfs2_rindex_update(sdp);
1914 if (error)
1915 goto out;
1916
1917 error = gfs2_quota_lock(ip, nuid, ngid);
1918 if (error)
1919 goto out;
1920
1921 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1922
1923 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1924 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1925 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1926 if (error)
1927 goto out_gunlock_q;
1928 }
1929
1930 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1931 if (error)
1932 goto out_gunlock_q;
1933
1934 error = gfs2_setattr_simple(inode, attr);
1935 if (error)
1936 goto out_end_trans;
1937
1938 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1939 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1940 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1941 gfs2_quota_change(ip, ap.target, nuid, ngid);
1942 }
1943
1944out_end_trans:
1945 gfs2_trans_end(sdp);
1946out_gunlock_q:
1947 gfs2_quota_unlock(ip);
1948out:
1949 gfs2_qa_put(ip);
1950 return error;
1951}
1952
1953/**
1954 * gfs2_setattr - Change attributes on an inode
1955 * @dentry: The dentry which is changing
1956 * @attr: The structure describing the change
1957 *
1958 * The VFS layer wants to change one or more of an inodes attributes. Write
1959 * that change out to disk.
1960 *
1961 * Returns: errno
1962 */
1963
1964static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1965{
1966 struct inode *inode = d_inode(dentry);
1967 struct gfs2_inode *ip = GFS2_I(inode);
1968 struct gfs2_holder i_gh;
1969 int error;
1970
1971 error = gfs2_qa_get(ip);
1972 if (error)
1973 return error;
1974
1975 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1976 if (error)
1977 goto out;
1978
1979 error = -EPERM;
1980 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1981 goto error;
1982
1983 error = setattr_prepare(dentry, attr);
1984 if (error)
1985 goto error;
1986
1987 if (attr->ia_valid & ATTR_SIZE)
1988 error = gfs2_setattr_size(inode, attr->ia_size);
1989 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1990 error = setattr_chown(inode, attr);
1991 else {
1992 error = gfs2_setattr_simple(inode, attr);
1993 if (!error && attr->ia_valid & ATTR_MODE)
1994 error = posix_acl_chmod(inode, inode->i_mode);
1995 }
1996
1997error:
1998 if (!error)
1999 mark_inode_dirty(inode);
2000 gfs2_glock_dq_uninit(&i_gh);
2001out:
2002 gfs2_qa_put(ip);
2003 return error;
2004}
2005
2006/**
2007 * gfs2_getattr - Read out an inode's attributes
2008 * @path: Object to query
2009 * @stat: The inode's stats
2010 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2011 * @flags: AT_STATX_xxx setting
2012 *
2013 * This may be called from the VFS directly, or from within GFS2 with the
2014 * inode locked, so we look to see if the glock is already locked and only
2015 * lock the glock if its not already been done. Note that its the NFS
2016 * readdirplus operation which causes this to be called (from filldir)
2017 * with the glock already held.
2018 *
2019 * Returns: errno
2020 */
2021
2022static int gfs2_getattr(const struct path *path, struct kstat *stat,
2023 u32 request_mask, unsigned int flags)
2024{
2025 struct inode *inode = d_inode(path->dentry);
2026 struct gfs2_inode *ip = GFS2_I(inode);
2027 struct gfs2_holder gh;
2028 u32 gfsflags;
2029 int error;
2030
2031 gfs2_holder_mark_uninitialized(&gh);
2032 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2033 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2034 if (error)
2035 return error;
2036 }
2037
2038 gfsflags = ip->i_diskflags;
2039 if (gfsflags & GFS2_DIF_APPENDONLY)
2040 stat->attributes |= STATX_ATTR_APPEND;
2041 if (gfsflags & GFS2_DIF_IMMUTABLE)
2042 stat->attributes |= STATX_ATTR_IMMUTABLE;
2043
2044 stat->attributes_mask |= (STATX_ATTR_APPEND |
2045 STATX_ATTR_COMPRESSED |
2046 STATX_ATTR_ENCRYPTED |
2047 STATX_ATTR_IMMUTABLE |
2048 STATX_ATTR_NODUMP);
2049
2050 generic_fillattr(inode, stat);
2051
2052 if (gfs2_holder_initialized(&gh))
2053 gfs2_glock_dq_uninit(&gh);
2054
2055 return 0;
2056}
2057
2058static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2059 u64 start, u64 len)
2060{
2061 struct gfs2_inode *ip = GFS2_I(inode);
2062 struct gfs2_holder gh;
2063 int ret;
2064
2065 inode_lock_shared(inode);
2066
2067 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2068 if (ret)
2069 goto out;
2070
2071 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2072
2073 gfs2_glock_dq_uninit(&gh);
2074
2075out:
2076 inode_unlock_shared(inode);
2077 return ret;
2078}
2079
2080loff_t gfs2_seek_data(struct file *file, loff_t offset)
2081{
2082 struct inode *inode = file->f_mapping->host;
2083 struct gfs2_inode *ip = GFS2_I(inode);
2084 struct gfs2_holder gh;
2085 loff_t ret;
2086
2087 inode_lock_shared(inode);
2088 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2089 if (!ret)
2090 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2091 gfs2_glock_dq_uninit(&gh);
2092 inode_unlock_shared(inode);
2093
2094 if (ret < 0)
2095 return ret;
2096 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2097}
2098
2099loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2100{
2101 struct inode *inode = file->f_mapping->host;
2102 struct gfs2_inode *ip = GFS2_I(inode);
2103 struct gfs2_holder gh;
2104 loff_t ret;
2105
2106 inode_lock_shared(inode);
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2108 if (!ret)
2109 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2110 gfs2_glock_dq_uninit(&gh);
2111 inode_unlock_shared(inode);
2112
2113 if (ret < 0)
2114 return ret;
2115 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2116}
2117
2118const struct inode_operations gfs2_file_iops = {
2119 .permission = gfs2_permission,
2120 .setattr = gfs2_setattr,
2121 .getattr = gfs2_getattr,
2122 .listxattr = gfs2_listxattr,
2123 .fiemap = gfs2_fiemap,
2124 .get_acl = gfs2_get_acl,
2125 .set_acl = gfs2_set_acl,
2126};
2127
2128const struct inode_operations gfs2_dir_iops = {
2129 .create = gfs2_create,
2130 .lookup = gfs2_lookup,
2131 .link = gfs2_link,
2132 .unlink = gfs2_unlink,
2133 .symlink = gfs2_symlink,
2134 .mkdir = gfs2_mkdir,
2135 .rmdir = gfs2_unlink,
2136 .mknod = gfs2_mknod,
2137 .rename = gfs2_rename2,
2138 .permission = gfs2_permission,
2139 .setattr = gfs2_setattr,
2140 .getattr = gfs2_getattr,
2141 .listxattr = gfs2_listxattr,
2142 .fiemap = gfs2_fiemap,
2143 .get_acl = gfs2_get_acl,
2144 .set_acl = gfs2_set_acl,
2145 .atomic_open = gfs2_atomic_open,
2146};
2147
2148const struct inode_operations gfs2_symlink_iops = {
2149 .get_link = gfs2_get_link,
2150 .permission = gfs2_permission,
2151 .setattr = gfs2_setattr,
2152 .getattr = gfs2_getattr,
2153 .listxattr = gfs2_listxattr,
2154 .fiemap = gfs2_fiemap,
2155};
2156