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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 inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
41{
42 return ilookup(sb, (unsigned long)no_addr);
43}
44
45/**
46 * gfs2_set_iop - Sets inode operations
47 * @inode: The inode with correct i_mode filled in
48 *
49 * GFS2 lookup code fills in vfs inode contents based on info obtained
50 * from directory entry inside gfs2_inode_lookup().
51 */
52
53static void gfs2_set_iop(struct inode *inode)
54{
55 struct gfs2_sbd *sdp = GFS2_SB(inode);
56 umode_t mode = inode->i_mode;
57
58 if (S_ISREG(mode)) {
59 inode->i_op = &gfs2_file_iops;
60 if (gfs2_localflocks(sdp))
61 inode->i_fop = &gfs2_file_fops_nolock;
62 else
63 inode->i_fop = &gfs2_file_fops;
64 } else if (S_ISDIR(mode)) {
65 inode->i_op = &gfs2_dir_iops;
66 if (gfs2_localflocks(sdp))
67 inode->i_fop = &gfs2_dir_fops_nolock;
68 else
69 inode->i_fop = &gfs2_dir_fops;
70 } else if (S_ISLNK(mode)) {
71 inode->i_op = &gfs2_symlink_iops;
72 } else {
73 inode->i_op = &gfs2_file_iops;
74 init_special_inode(inode, inode->i_mode, inode->i_rdev);
75 }
76}
77
78/**
79 * gfs2_inode_lookup - Lookup an inode
80 * @sb: The super block
81 * @no_addr: The inode number
82 * @type: The type of the inode
83 *
84 * Returns: A VFS inode, or an error
85 */
86
87struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
88 u64 no_addr, u64 no_formal_ino)
89{
90 struct inode *inode;
91 struct gfs2_inode *ip;
92 struct gfs2_glock *io_gl = NULL;
93 int error;
94
95 inode = iget_locked(sb, (unsigned long)no_addr);
96 ip = GFS2_I(inode);
97 ip->i_no_addr = no_addr;
98
99 if (!inode)
100 return ERR_PTR(-ENOMEM);
101
102 if (inode->i_state & I_NEW) {
103 struct gfs2_sbd *sdp = GFS2_SB(inode);
104 ip->i_no_formal_ino = no_formal_ino;
105
106 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
107 if (unlikely(error))
108 goto fail;
109 ip->i_gl->gl_object = ip;
110
111 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
112 if (unlikely(error))
113 goto fail_put;
114
115 set_bit(GIF_INVALID, &ip->i_flags);
116 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
117 if (unlikely(error))
118 goto fail_iopen;
119
120 ip->i_iopen_gh.gh_gl->gl_object = ip;
121 gfs2_glock_put(io_gl);
122 io_gl = NULL;
123
124 if (type == DT_UNKNOWN) {
125 /* Inode glock must be locked already */
126 error = gfs2_inode_refresh(GFS2_I(inode));
127 if (error)
128 goto fail_refresh;
129 } else {
130 inode->i_mode = DT2IF(type);
131 }
132
133 gfs2_set_iop(inode);
134 unlock_new_inode(inode);
135 }
136
137 return inode;
138
139fail_refresh:
140 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
141 ip->i_iopen_gh.gh_gl->gl_object = NULL;
142 gfs2_glock_dq_wait(&ip->i_iopen_gh);
143 gfs2_holder_uninit(&ip->i_iopen_gh);
144fail_iopen:
145 if (io_gl)
146 gfs2_glock_put(io_gl);
147fail_put:
148 ip->i_gl->gl_object = NULL;
149fail:
150 iget_failed(inode);
151 return ERR_PTR(error);
152}
153
154struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
155 u64 *no_formal_ino, unsigned int blktype)
156{
157 struct super_block *sb = sdp->sd_vfs;
158 struct gfs2_holder i_gh;
159 struct inode *inode = NULL;
160 int error;
161
162 /* Must not read in block until block type is verified */
163 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
164 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
165 if (error)
166 return ERR_PTR(error);
167
168 error = gfs2_check_blk_type(sdp, no_addr, blktype);
169 if (error)
170 goto fail;
171
172 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0);
173 if (IS_ERR(inode))
174 goto fail;
175
176 /* Two extra checks for NFS only */
177 if (no_formal_ino) {
178 error = -ESTALE;
179 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
180 goto fail_iput;
181
182 error = -EIO;
183 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
184 goto fail_iput;
185
186 error = 0;
187 }
188
189fail:
190 gfs2_glock_dq_uninit(&i_gh);
191 return error ? ERR_PTR(error) : inode;
192fail_iput:
193 iput(inode);
194 goto fail;
195}
196
197
198struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
199{
200 struct qstr qstr;
201 struct inode *inode;
202 gfs2_str2qstr(&qstr, name);
203 inode = gfs2_lookupi(dip, &qstr, 1);
204 /* gfs2_lookupi has inconsistent callers: vfs
205 * related routines expect NULL for no entry found,
206 * gfs2_lookup_simple callers expect ENOENT
207 * and do not check for NULL.
208 */
209 if (inode == NULL)
210 return ERR_PTR(-ENOENT);
211 else
212 return inode;
213}
214
215
216/**
217 * gfs2_lookupi - Look up a filename in a directory and return its inode
218 * @d_gh: An initialized holder for the directory glock
219 * @name: The name of the inode to look for
220 * @is_root: If 1, ignore the caller's permissions
221 * @i_gh: An uninitialized holder for the new inode glock
222 *
223 * This can be called via the VFS filldir function when NFS is doing
224 * a readdirplus and the inode which its intending to stat isn't
225 * already in cache. In this case we must not take the directory glock
226 * again, since the readdir call will have already taken that lock.
227 *
228 * Returns: errno
229 */
230
231struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
232 int is_root)
233{
234 struct super_block *sb = dir->i_sb;
235 struct gfs2_inode *dip = GFS2_I(dir);
236 struct gfs2_holder d_gh;
237 int error = 0;
238 struct inode *inode = NULL;
239 int unlock = 0;
240
241 if (!name->len || name->len > GFS2_FNAMESIZE)
242 return ERR_PTR(-ENAMETOOLONG);
243
244 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
245 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
246 dir == d_inode(sb->s_root))) {
247 igrab(dir);
248 return dir;
249 }
250
251 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
252 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
253 if (error)
254 return ERR_PTR(error);
255 unlock = 1;
256 }
257
258 if (!is_root) {
259 error = gfs2_permission(dir, MAY_EXEC);
260 if (error)
261 goto out;
262 }
263
264 inode = gfs2_dir_search(dir, name, false);
265 if (IS_ERR(inode))
266 error = PTR_ERR(inode);
267out:
268 if (unlock)
269 gfs2_glock_dq_uninit(&d_gh);
270 if (error == -ENOENT)
271 return NULL;
272 return inode ? inode : ERR_PTR(error);
273}
274
275/**
276 * create_ok - OK to create a new on-disk inode here?
277 * @dip: Directory in which dinode is to be created
278 * @name: Name of new dinode
279 * @mode:
280 *
281 * Returns: errno
282 */
283
284static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
285 umode_t mode)
286{
287 int error;
288
289 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
290 if (error)
291 return error;
292
293 /* Don't create entries in an unlinked directory */
294 if (!dip->i_inode.i_nlink)
295 return -ENOENT;
296
297 if (dip->i_entries == (u32)-1)
298 return -EFBIG;
299 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
300 return -EMLINK;
301
302 return 0;
303}
304
305static void munge_mode_uid_gid(const struct gfs2_inode *dip,
306 struct inode *inode)
307{
308 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
309 (dip->i_inode.i_mode & S_ISUID) &&
310 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
311 if (S_ISDIR(inode->i_mode))
312 inode->i_mode |= S_ISUID;
313 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
314 inode->i_mode &= ~07111;
315 inode->i_uid = dip->i_inode.i_uid;
316 } else
317 inode->i_uid = current_fsuid();
318
319 if (dip->i_inode.i_mode & S_ISGID) {
320 if (S_ISDIR(inode->i_mode))
321 inode->i_mode |= S_ISGID;
322 inode->i_gid = dip->i_inode.i_gid;
323 } else
324 inode->i_gid = current_fsgid();
325}
326
327static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
328{
329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
330 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
331 int error;
332
333 error = gfs2_quota_lock_check(ip, &ap);
334 if (error)
335 goto out;
336
337 error = gfs2_inplace_reserve(ip, &ap);
338 if (error)
339 goto out_quota;
340
341 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
342 if (error)
343 goto out_ipreserv;
344
345 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
346 ip->i_no_formal_ino = ip->i_generation;
347 ip->i_inode.i_ino = ip->i_no_addr;
348 ip->i_goal = ip->i_no_addr;
349
350 gfs2_trans_end(sdp);
351
352out_ipreserv:
353 gfs2_inplace_release(ip);
354out_quota:
355 gfs2_quota_unlock(ip);
356out:
357 return error;
358}
359
360static void gfs2_init_dir(struct buffer_head *dibh,
361 const struct gfs2_inode *parent)
362{
363 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
364 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
365
366 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
367 dent->de_inum = di->di_num; /* already GFS2 endian */
368 dent->de_type = cpu_to_be16(DT_DIR);
369
370 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
371 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
372 gfs2_inum_out(parent, dent);
373 dent->de_type = cpu_to_be16(DT_DIR);
374
375}
376
377/**
378 * gfs2_init_xattr - Initialise an xattr block for a new inode
379 * @ip: The inode in question
380 *
381 * This sets up an empty xattr block for a new inode, ready to
382 * take any ACLs, LSM xattrs, etc.
383 */
384
385static void gfs2_init_xattr(struct gfs2_inode *ip)
386{
387 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
388 struct buffer_head *bh;
389 struct gfs2_ea_header *ea;
390
391 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
392 gfs2_trans_add_meta(ip->i_gl, bh);
393 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
394 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
395
396 ea = GFS2_EA_BH2FIRST(bh);
397 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
398 ea->ea_type = GFS2_EATYPE_UNUSED;
399 ea->ea_flags = GFS2_EAFLAG_LAST;
400
401 brelse(bh);
402}
403
404/**
405 * init_dinode - Fill in a new dinode structure
406 * @dip: The directory this inode is being created in
407 * @ip: The inode
408 * @symname: The symlink destination (if a symlink)
409 * @bhp: The buffer head (returned to caller)
410 *
411 */
412
413static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
414 const char *symname)
415{
416 struct gfs2_dinode *di;
417 struct buffer_head *dibh;
418
419 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
420 gfs2_trans_add_meta(ip->i_gl, dibh);
421 di = (struct gfs2_dinode *)dibh->b_data;
422 gfs2_dinode_out(ip, di);
423
424 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
425 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
426 di->__pad1 = 0;
427 di->__pad2 = 0;
428 di->__pad3 = 0;
429 memset(&di->__pad4, 0, sizeof(di->__pad4));
430 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
431 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
432
433 switch(ip->i_inode.i_mode & S_IFMT) {
434 case S_IFDIR:
435 gfs2_init_dir(dibh, dip);
436 break;
437 case S_IFLNK:
438 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
439 break;
440 }
441
442 set_buffer_uptodate(dibh);
443 brelse(dibh);
444}
445
446/**
447 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
448 * @dip: The directory we are linking into
449 * @da: The dir add information
450 * @nr_inodes: The number of inodes involved
451 *
452 * This calculate the number of blocks we need to reserve in a
453 * transaction to link @nr_inodes into a directory. In most cases
454 * @nr_inodes will be 2 (the directory plus the inode being linked in)
455 * but in case of rename, 4 may be required.
456 *
457 * Returns: Number of blocks
458 */
459
460static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
461 const struct gfs2_diradd *da,
462 unsigned nr_inodes)
463{
464 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
465 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
466}
467
468static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
469 struct gfs2_inode *ip, struct gfs2_diradd *da)
470{
471 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
472 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
473 int error;
474
475 if (da->nr_blocks) {
476 error = gfs2_quota_lock_check(dip, &ap);
477 if (error)
478 goto fail_quota_locks;
479
480 error = gfs2_inplace_reserve(dip, &ap);
481 if (error)
482 goto fail_quota_locks;
483
484 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
485 if (error)
486 goto fail_ipreserv;
487 } else {
488 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
489 if (error)
490 goto fail_quota_locks;
491 }
492
493 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
494
495 gfs2_trans_end(sdp);
496fail_ipreserv:
497 gfs2_inplace_release(dip);
498fail_quota_locks:
499 gfs2_quota_unlock(dip);
500 return error;
501}
502
503static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
504 void *fs_info)
505{
506 const struct xattr *xattr;
507 int err = 0;
508
509 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
510 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
511 xattr->value_len, 0,
512 GFS2_EATYPE_SECURITY);
513 if (err < 0)
514 break;
515 }
516 return err;
517}
518
519/**
520 * gfs2_create_inode - Create a new inode
521 * @dir: The parent directory
522 * @dentry: The new dentry
523 * @file: If non-NULL, the file which is being opened
524 * @mode: The permissions on the new inode
525 * @dev: For device nodes, this is the device number
526 * @symname: For symlinks, this is the link destination
527 * @size: The initial size of the inode (ignored for directories)
528 *
529 * Returns: 0 on success, or error code
530 */
531
532static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
533 struct file *file,
534 umode_t mode, dev_t dev, const char *symname,
535 unsigned int size, int excl, int *opened)
536{
537 const struct qstr *name = &dentry->d_name;
538 struct posix_acl *default_acl, *acl;
539 struct gfs2_holder ghs[2];
540 struct inode *inode = NULL;
541 struct gfs2_inode *dip = GFS2_I(dir), *ip;
542 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
543 struct gfs2_glock *io_gl = NULL;
544 int error, free_vfs_inode = 1;
545 u32 aflags = 0;
546 unsigned blocks = 1;
547 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
548
549 if (!name->len || name->len > GFS2_FNAMESIZE)
550 return -ENAMETOOLONG;
551
552 error = gfs2_rsqa_alloc(dip);
553 if (error)
554 return error;
555
556 error = gfs2_rindex_update(sdp);
557 if (error)
558 return error;
559
560 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
561 if (error)
562 goto fail;
563
564 error = create_ok(dip, name, mode);
565 if (error)
566 goto fail_gunlock;
567
568 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
569 error = PTR_ERR(inode);
570 if (!IS_ERR(inode)) {
571 if (S_ISDIR(inode->i_mode)) {
572 iput(inode);
573 inode = ERR_PTR(-EISDIR);
574 goto fail_gunlock;
575 }
576 d_instantiate(dentry, inode);
577 error = 0;
578 if (file) {
579 if (S_ISREG(inode->i_mode))
580 error = finish_open(file, dentry, gfs2_open_common, opened);
581 else
582 error = finish_no_open(file, NULL);
583 }
584 gfs2_glock_dq_uninit(ghs);
585 return error;
586 } else if (error != -ENOENT) {
587 goto fail_gunlock;
588 }
589
590 error = gfs2_diradd_alloc_required(dir, name, &da);
591 if (error < 0)
592 goto fail_gunlock;
593
594 inode = new_inode(sdp->sd_vfs);
595 error = -ENOMEM;
596 if (!inode)
597 goto fail_gunlock;
598
599 error = posix_acl_create(dir, &mode, &default_acl, &acl);
600 if (error)
601 goto fail_gunlock;
602
603 ip = GFS2_I(inode);
604 error = gfs2_rsqa_alloc(ip);
605 if (error)
606 goto fail_free_acls;
607
608 inode->i_mode = mode;
609 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
610 inode->i_rdev = dev;
611 inode->i_size = size;
612 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
613 gfs2_set_inode_blocks(inode, 1);
614 munge_mode_uid_gid(dip, inode);
615 check_and_update_goal(dip);
616 ip->i_goal = dip->i_goal;
617 ip->i_diskflags = 0;
618 ip->i_eattr = 0;
619 ip->i_height = 0;
620 ip->i_depth = 0;
621 ip->i_entries = 0;
622
623 switch(mode & S_IFMT) {
624 case S_IFREG:
625 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
626 gfs2_tune_get(sdp, gt_new_files_jdata))
627 ip->i_diskflags |= GFS2_DIF_JDATA;
628 gfs2_set_aops(inode);
629 break;
630 case S_IFDIR:
631 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
632 ip->i_diskflags |= GFS2_DIF_JDATA;
633 ip->i_entries = 2;
634 break;
635 }
636
637 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
638 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
639 ip->i_diskflags |= GFS2_DIF_SYSTEM;
640
641 gfs2_set_inode_flags(inode);
642
643 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
644 (dip->i_diskflags & GFS2_DIF_TOPDIR))
645 aflags |= GFS2_AF_ORLOV;
646
647 if (default_acl || acl)
648 blocks++;
649
650 error = alloc_dinode(ip, aflags, &blocks);
651 if (error)
652 goto fail_free_inode;
653
654 gfs2_set_inode_blocks(inode, blocks);
655
656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
657 if (error)
658 goto fail_free_inode;
659
660 ip->i_gl->gl_object = ip;
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
662 if (error)
663 goto fail_free_inode;
664
665 error = gfs2_trans_begin(sdp, blocks, 0);
666 if (error)
667 goto fail_gunlock2;
668
669 if (blocks > 1) {
670 ip->i_eattr = ip->i_no_addr + 1;
671 gfs2_init_xattr(ip);
672 }
673 init_dinode(dip, ip, symname);
674 gfs2_trans_end(sdp);
675
676 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
677 if (error)
678 goto fail_gunlock2;
679
680 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
681
682 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
683 if (error)
684 goto fail_gunlock2;
685
686 ip->i_iopen_gh.gh_gl->gl_object = ip;
687 gfs2_glock_put(io_gl);
688 gfs2_set_iop(inode);
689 insert_inode_hash(inode);
690
691 free_vfs_inode = 0; /* After this point, the inode is no longer
692 considered free. Any failures need to undo
693 the gfs2 structures. */
694 if (default_acl) {
695 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
696 posix_acl_release(default_acl);
697 }
698 if (acl) {
699 if (!error)
700 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
701 posix_acl_release(acl);
702 }
703
704 if (error)
705 goto fail_gunlock3;
706
707 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
708 &gfs2_initxattrs, NULL);
709 if (error)
710 goto fail_gunlock3;
711
712 error = link_dinode(dip, name, ip, &da);
713 if (error)
714 goto fail_gunlock3;
715
716 mark_inode_dirty(inode);
717 d_instantiate(dentry, inode);
718 if (file) {
719 *opened |= FILE_CREATED;
720 error = finish_open(file, dentry, gfs2_open_common, opened);
721 }
722 gfs2_glock_dq_uninit(ghs);
723 gfs2_glock_dq_uninit(ghs + 1);
724 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
725 return error;
726
727fail_gunlock3:
728 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
729 gfs2_glock_put(io_gl);
730fail_gunlock2:
731 if (io_gl)
732 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
733 gfs2_glock_dq_uninit(ghs + 1);
734fail_free_inode:
735 if (ip->i_gl)
736 gfs2_glock_put(ip->i_gl);
737 gfs2_rsqa_delete(ip, NULL);
738fail_free_acls:
739 if (default_acl)
740 posix_acl_release(default_acl);
741 if (acl)
742 posix_acl_release(acl);
743fail_gunlock:
744 gfs2_dir_no_add(&da);
745 gfs2_glock_dq_uninit(ghs);
746 if (inode && !IS_ERR(inode)) {
747 clear_nlink(inode);
748 if (!free_vfs_inode)
749 mark_inode_dirty(inode);
750 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
751 &GFS2_I(inode)->i_flags);
752 iput(inode);
753 }
754fail:
755 return error;
756}
757
758/**
759 * gfs2_create - Create a file
760 * @dir: The directory in which to create the file
761 * @dentry: The dentry of the new file
762 * @mode: The mode of the new file
763 *
764 * Returns: errno
765 */
766
767static int gfs2_create(struct inode *dir, struct dentry *dentry,
768 umode_t mode, bool excl)
769{
770 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
771}
772
773/**
774 * __gfs2_lookup - Look up a filename in a directory and return its inode
775 * @dir: The directory inode
776 * @dentry: The dentry of the new inode
777 * @file: File to be opened
778 * @opened: atomic_open flags
779 *
780 *
781 * Returns: errno
782 */
783
784static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
785 struct file *file, int *opened)
786{
787 struct inode *inode;
788 struct dentry *d;
789 struct gfs2_holder gh;
790 struct gfs2_glock *gl;
791 int error;
792
793 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
794 if (inode == NULL) {
795 d_add(dentry, NULL);
796 return NULL;
797 }
798 if (IS_ERR(inode))
799 return ERR_CAST(inode);
800
801 gl = GFS2_I(inode)->i_gl;
802 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
803 if (error) {
804 iput(inode);
805 return ERR_PTR(error);
806 }
807
808 d = d_splice_alias(inode, dentry);
809 if (IS_ERR(d)) {
810 gfs2_glock_dq_uninit(&gh);
811 return d;
812 }
813 if (file && S_ISREG(inode->i_mode))
814 error = finish_open(file, dentry, gfs2_open_common, opened);
815
816 gfs2_glock_dq_uninit(&gh);
817 if (error) {
818 dput(d);
819 return ERR_PTR(error);
820 }
821 return d;
822}
823
824static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
825 unsigned flags)
826{
827 return __gfs2_lookup(dir, dentry, NULL, NULL);
828}
829
830/**
831 * gfs2_link - Link to a file
832 * @old_dentry: The inode to link
833 * @dir: Add link to this directory
834 * @dentry: The name of the link
835 *
836 * Link the inode in "old_dentry" into the directory "dir" with the
837 * name in "dentry".
838 *
839 * Returns: errno
840 */
841
842static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
843 struct dentry *dentry)
844{
845 struct gfs2_inode *dip = GFS2_I(dir);
846 struct gfs2_sbd *sdp = GFS2_SB(dir);
847 struct inode *inode = d_inode(old_dentry);
848 struct gfs2_inode *ip = GFS2_I(inode);
849 struct gfs2_holder ghs[2];
850 struct buffer_head *dibh;
851 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
852 int error;
853
854 if (S_ISDIR(inode->i_mode))
855 return -EPERM;
856
857 error = gfs2_rsqa_alloc(dip);
858 if (error)
859 return error;
860
861 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
862 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
863
864 error = gfs2_glock_nq(ghs); /* parent */
865 if (error)
866 goto out_parent;
867
868 error = gfs2_glock_nq(ghs + 1); /* child */
869 if (error)
870 goto out_child;
871
872 error = -ENOENT;
873 if (inode->i_nlink == 0)
874 goto out_gunlock;
875
876 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
877 if (error)
878 goto out_gunlock;
879
880 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
881 switch (error) {
882 case -ENOENT:
883 break;
884 case 0:
885 error = -EEXIST;
886 default:
887 goto out_gunlock;
888 }
889
890 error = -EINVAL;
891 if (!dip->i_inode.i_nlink)
892 goto out_gunlock;
893 error = -EFBIG;
894 if (dip->i_entries == (u32)-1)
895 goto out_gunlock;
896 error = -EPERM;
897 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
898 goto out_gunlock;
899 error = -EINVAL;
900 if (!ip->i_inode.i_nlink)
901 goto out_gunlock;
902 error = -EMLINK;
903 if (ip->i_inode.i_nlink == (u32)-1)
904 goto out_gunlock;
905
906 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
907 if (error < 0)
908 goto out_gunlock;
909
910 if (da.nr_blocks) {
911 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
912 error = gfs2_quota_lock_check(dip, &ap);
913 if (error)
914 goto out_gunlock;
915
916 error = gfs2_inplace_reserve(dip, &ap);
917 if (error)
918 goto out_gunlock_q;
919
920 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
921 if (error)
922 goto out_ipres;
923 } else {
924 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
925 if (error)
926 goto out_ipres;
927 }
928
929 error = gfs2_meta_inode_buffer(ip, &dibh);
930 if (error)
931 goto out_end_trans;
932
933 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
934 if (error)
935 goto out_brelse;
936
937 gfs2_trans_add_meta(ip->i_gl, dibh);
938 inc_nlink(&ip->i_inode);
939 ip->i_inode.i_ctime = CURRENT_TIME;
940 ihold(inode);
941 d_instantiate(dentry, inode);
942 mark_inode_dirty(inode);
943
944out_brelse:
945 brelse(dibh);
946out_end_trans:
947 gfs2_trans_end(sdp);
948out_ipres:
949 if (da.nr_blocks)
950 gfs2_inplace_release(dip);
951out_gunlock_q:
952 if (da.nr_blocks)
953 gfs2_quota_unlock(dip);
954out_gunlock:
955 gfs2_dir_no_add(&da);
956 gfs2_glock_dq(ghs + 1);
957out_child:
958 gfs2_glock_dq(ghs);
959out_parent:
960 gfs2_holder_uninit(ghs);
961 gfs2_holder_uninit(ghs + 1);
962 return error;
963}
964
965/*
966 * gfs2_unlink_ok - check to see that a inode is still in a directory
967 * @dip: the directory
968 * @name: the name of the file
969 * @ip: the inode
970 *
971 * Assumes that the lock on (at least) @dip is held.
972 *
973 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
974 */
975
976static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
977 const struct gfs2_inode *ip)
978{
979 int error;
980
981 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
982 return -EPERM;
983
984 if ((dip->i_inode.i_mode & S_ISVTX) &&
985 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
986 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
987 return -EPERM;
988
989 if (IS_APPEND(&dip->i_inode))
990 return -EPERM;
991
992 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
993 if (error)
994 return error;
995
996 return gfs2_dir_check(&dip->i_inode, name, ip);
997}
998
999/**
1000 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1001 * @dip: The parent directory
1002 * @name: The name of the entry in the parent directory
1003 * @inode: The inode to be removed
1004 *
1005 * Called with all the locks and in a transaction. This will only be
1006 * called for a directory after it has been checked to ensure it is empty.
1007 *
1008 * Returns: 0 on success, or an error
1009 */
1010
1011static int gfs2_unlink_inode(struct gfs2_inode *dip,
1012 const struct dentry *dentry)
1013{
1014 struct inode *inode = d_inode(dentry);
1015 struct gfs2_inode *ip = GFS2_I(inode);
1016 int error;
1017
1018 error = gfs2_dir_del(dip, dentry);
1019 if (error)
1020 return error;
1021
1022 ip->i_entries = 0;
1023 inode->i_ctime = CURRENT_TIME;
1024 if (S_ISDIR(inode->i_mode))
1025 clear_nlink(inode);
1026 else
1027 drop_nlink(inode);
1028 mark_inode_dirty(inode);
1029 if (inode->i_nlink == 0)
1030 gfs2_unlink_di(inode);
1031 return 0;
1032}
1033
1034
1035/**
1036 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1037 * @dir: The inode of the directory containing the inode to unlink
1038 * @dentry: The file itself
1039 *
1040 * This routine uses the type of the inode as a flag to figure out
1041 * whether this is an unlink or an rmdir.
1042 *
1043 * Returns: errno
1044 */
1045
1046static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1047{
1048 struct gfs2_inode *dip = GFS2_I(dir);
1049 struct gfs2_sbd *sdp = GFS2_SB(dir);
1050 struct inode *inode = d_inode(dentry);
1051 struct gfs2_inode *ip = GFS2_I(inode);
1052 struct gfs2_holder ghs[3];
1053 struct gfs2_rgrpd *rgd;
1054 int error;
1055
1056 error = gfs2_rindex_update(sdp);
1057 if (error)
1058 return error;
1059
1060 error = -EROFS;
1061
1062 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1063 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1064
1065 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1066 if (!rgd)
1067 goto out_inodes;
1068
1069 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1070
1071
1072 error = gfs2_glock_nq(ghs); /* parent */
1073 if (error)
1074 goto out_parent;
1075
1076 error = gfs2_glock_nq(ghs + 1); /* child */
1077 if (error)
1078 goto out_child;
1079
1080 error = -ENOENT;
1081 if (inode->i_nlink == 0)
1082 goto out_rgrp;
1083
1084 if (S_ISDIR(inode->i_mode)) {
1085 error = -ENOTEMPTY;
1086 if (ip->i_entries > 2 || inode->i_nlink > 2)
1087 goto out_rgrp;
1088 }
1089
1090 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1091 if (error)
1092 goto out_rgrp;
1093
1094 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1095 if (error)
1096 goto out_gunlock;
1097
1098 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1099 if (error)
1100 goto out_end_trans;
1101
1102 error = gfs2_unlink_inode(dip, dentry);
1103
1104out_end_trans:
1105 gfs2_trans_end(sdp);
1106out_gunlock:
1107 gfs2_glock_dq(ghs + 2);
1108out_rgrp:
1109 gfs2_glock_dq(ghs + 1);
1110out_child:
1111 gfs2_glock_dq(ghs);
1112out_parent:
1113 gfs2_holder_uninit(ghs + 2);
1114out_inodes:
1115 gfs2_holder_uninit(ghs + 1);
1116 gfs2_holder_uninit(ghs);
1117 return error;
1118}
1119
1120/**
1121 * gfs2_symlink - Create a symlink
1122 * @dir: The directory to create the symlink in
1123 * @dentry: The dentry to put the symlink in
1124 * @symname: The thing which the link points to
1125 *
1126 * Returns: errno
1127 */
1128
1129static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1130 const char *symname)
1131{
1132 struct gfs2_sbd *sdp = GFS2_SB(dir);
1133 unsigned int size;
1134
1135 size = strlen(symname);
1136 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1137 return -ENAMETOOLONG;
1138
1139 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1140}
1141
1142/**
1143 * gfs2_mkdir - Make a directory
1144 * @dir: The parent directory of the new one
1145 * @dentry: The dentry of the new directory
1146 * @mode: The mode of the new directory
1147 *
1148 * Returns: errno
1149 */
1150
1151static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1152{
1153 struct gfs2_sbd *sdp = GFS2_SB(dir);
1154 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1155 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1156}
1157
1158/**
1159 * gfs2_mknod - Make a special file
1160 * @dir: The directory in which the special file will reside
1161 * @dentry: The dentry of the special file
1162 * @mode: The mode of the special file
1163 * @dev: The device specification of the special file
1164 *
1165 */
1166
1167static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1168 dev_t dev)
1169{
1170 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1171}
1172
1173/**
1174 * gfs2_atomic_open - Atomically open a file
1175 * @dir: The directory
1176 * @dentry: The proposed new entry
1177 * @file: The proposed new struct file
1178 * @flags: open flags
1179 * @mode: File mode
1180 * @opened: Flag to say whether the file has been opened or not
1181 *
1182 * Returns: error code or 0 for success
1183 */
1184
1185static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1186 struct file *file, unsigned flags,
1187 umode_t mode, int *opened)
1188{
1189 struct dentry *d;
1190 bool excl = !!(flags & O_EXCL);
1191
1192 if (!d_unhashed(dentry))
1193 goto skip_lookup;
1194
1195 d = __gfs2_lookup(dir, dentry, file, opened);
1196 if (IS_ERR(d))
1197 return PTR_ERR(d);
1198 if (d != NULL)
1199 dentry = d;
1200 if (d_really_is_positive(dentry)) {
1201 if (!(*opened & FILE_OPENED))
1202 return finish_no_open(file, d);
1203 dput(d);
1204 return 0;
1205 }
1206
1207 BUG_ON(d != NULL);
1208
1209skip_lookup:
1210 if (!(flags & O_CREAT))
1211 return -ENOENT;
1212
1213 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1214}
1215
1216/*
1217 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1218 * @this: move this
1219 * @to: to here
1220 *
1221 * Follow @to back to the root and make sure we don't encounter @this
1222 * Assumes we already hold the rename lock.
1223 *
1224 * Returns: errno
1225 */
1226
1227static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1228{
1229 struct inode *dir = &to->i_inode;
1230 struct super_block *sb = dir->i_sb;
1231 struct inode *tmp;
1232 int error = 0;
1233
1234 igrab(dir);
1235
1236 for (;;) {
1237 if (dir == &this->i_inode) {
1238 error = -EINVAL;
1239 break;
1240 }
1241 if (dir == d_inode(sb->s_root)) {
1242 error = 0;
1243 break;
1244 }
1245
1246 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1247 if (!tmp) {
1248 error = -ENOENT;
1249 break;
1250 }
1251 if (IS_ERR(tmp)) {
1252 error = PTR_ERR(tmp);
1253 break;
1254 }
1255
1256 iput(dir);
1257 dir = tmp;
1258 }
1259
1260 iput(dir);
1261
1262 return error;
1263}
1264
1265/**
1266 * update_moved_ino - Update an inode that's being moved
1267 * @ip: The inode being moved
1268 * @ndip: The parent directory of the new filename
1269 * @dir_rename: True of ip is a directory
1270 *
1271 * Returns: errno
1272 */
1273
1274static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1275 int dir_rename)
1276{
1277 int error;
1278 struct buffer_head *dibh;
1279
1280 if (dir_rename)
1281 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1282
1283 error = gfs2_meta_inode_buffer(ip, &dibh);
1284 if (error)
1285 return error;
1286 ip->i_inode.i_ctime = CURRENT_TIME;
1287 gfs2_trans_add_meta(ip->i_gl, dibh);
1288 gfs2_dinode_out(ip, dibh->b_data);
1289 brelse(dibh);
1290 return 0;
1291}
1292
1293
1294/**
1295 * gfs2_rename - Rename a file
1296 * @odir: Parent directory of old file name
1297 * @odentry: The old dentry of the file
1298 * @ndir: Parent directory of new file name
1299 * @ndentry: The new dentry of the file
1300 *
1301 * Returns: errno
1302 */
1303
1304static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1305 struct inode *ndir, struct dentry *ndentry)
1306{
1307 struct gfs2_inode *odip = GFS2_I(odir);
1308 struct gfs2_inode *ndip = GFS2_I(ndir);
1309 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1310 struct gfs2_inode *nip = NULL;
1311 struct gfs2_sbd *sdp = GFS2_SB(odir);
1312 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1313 struct gfs2_rgrpd *nrgd;
1314 unsigned int num_gh;
1315 int dir_rename = 0;
1316 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1317 unsigned int x;
1318 int error;
1319
1320 if (d_really_is_positive(ndentry)) {
1321 nip = GFS2_I(d_inode(ndentry));
1322 if (ip == nip)
1323 return 0;
1324 }
1325
1326 error = gfs2_rindex_update(sdp);
1327 if (error)
1328 return error;
1329
1330 error = gfs2_rsqa_alloc(ndip);
1331 if (error)
1332 return error;
1333
1334 if (odip != ndip) {
1335 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1336 0, &r_gh);
1337 if (error)
1338 goto out;
1339
1340 if (S_ISDIR(ip->i_inode.i_mode)) {
1341 dir_rename = 1;
1342 /* don't move a directory into its subdir */
1343 error = gfs2_ok_to_move(ip, ndip);
1344 if (error)
1345 goto out_gunlock_r;
1346 }
1347 }
1348
1349 num_gh = 1;
1350 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1351 if (odip != ndip) {
1352 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1353 num_gh++;
1354 }
1355 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1356 num_gh++;
1357
1358 if (nip) {
1359 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1360 num_gh++;
1361 /* grab the resource lock for unlink flag twiddling
1362 * this is the case of the target file already existing
1363 * so we unlink before doing the rename
1364 */
1365 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1366 if (nrgd)
1367 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1368 }
1369
1370 for (x = 0; x < num_gh; x++) {
1371 error = gfs2_glock_nq(ghs + x);
1372 if (error)
1373 goto out_gunlock;
1374 }
1375
1376 error = -ENOENT;
1377 if (ip->i_inode.i_nlink == 0)
1378 goto out_gunlock;
1379
1380 /* Check out the old directory */
1381
1382 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1383 if (error)
1384 goto out_gunlock;
1385
1386 /* Check out the new directory */
1387
1388 if (nip) {
1389 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1390 if (error)
1391 goto out_gunlock;
1392
1393 if (nip->i_inode.i_nlink == 0) {
1394 error = -EAGAIN;
1395 goto out_gunlock;
1396 }
1397
1398 if (S_ISDIR(nip->i_inode.i_mode)) {
1399 if (nip->i_entries < 2) {
1400 gfs2_consist_inode(nip);
1401 error = -EIO;
1402 goto out_gunlock;
1403 }
1404 if (nip->i_entries > 2) {
1405 error = -ENOTEMPTY;
1406 goto out_gunlock;
1407 }
1408 }
1409 } else {
1410 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1411 if (error)
1412 goto out_gunlock;
1413
1414 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1415 switch (error) {
1416 case -ENOENT:
1417 error = 0;
1418 break;
1419 case 0:
1420 error = -EEXIST;
1421 default:
1422 goto out_gunlock;
1423 };
1424
1425 if (odip != ndip) {
1426 if (!ndip->i_inode.i_nlink) {
1427 error = -ENOENT;
1428 goto out_gunlock;
1429 }
1430 if (ndip->i_entries == (u32)-1) {
1431 error = -EFBIG;
1432 goto out_gunlock;
1433 }
1434 if (S_ISDIR(ip->i_inode.i_mode) &&
1435 ndip->i_inode.i_nlink == (u32)-1) {
1436 error = -EMLINK;
1437 goto out_gunlock;
1438 }
1439 }
1440 }
1441
1442 /* Check out the dir to be renamed */
1443
1444 if (dir_rename) {
1445 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1446 if (error)
1447 goto out_gunlock;
1448 }
1449
1450 if (nip == NULL) {
1451 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1452 if (error)
1453 goto out_gunlock;
1454 }
1455
1456 if (da.nr_blocks) {
1457 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1458 error = gfs2_quota_lock_check(ndip, &ap);
1459 if (error)
1460 goto out_gunlock;
1461
1462 error = gfs2_inplace_reserve(ndip, &ap);
1463 if (error)
1464 goto out_gunlock_q;
1465
1466 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1467 4 * RES_LEAF + 4, 0);
1468 if (error)
1469 goto out_ipreserv;
1470 } else {
1471 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1472 5 * RES_LEAF + 4, 0);
1473 if (error)
1474 goto out_gunlock;
1475 }
1476
1477 /* Remove the target file, if it exists */
1478
1479 if (nip)
1480 error = gfs2_unlink_inode(ndip, ndentry);
1481
1482 error = update_moved_ino(ip, ndip, dir_rename);
1483 if (error)
1484 goto out_end_trans;
1485
1486 error = gfs2_dir_del(odip, odentry);
1487 if (error)
1488 goto out_end_trans;
1489
1490 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1491 if (error)
1492 goto out_end_trans;
1493
1494out_end_trans:
1495 gfs2_trans_end(sdp);
1496out_ipreserv:
1497 if (da.nr_blocks)
1498 gfs2_inplace_release(ndip);
1499out_gunlock_q:
1500 if (da.nr_blocks)
1501 gfs2_quota_unlock(ndip);
1502out_gunlock:
1503 gfs2_dir_no_add(&da);
1504 while (x--) {
1505 gfs2_glock_dq(ghs + x);
1506 gfs2_holder_uninit(ghs + x);
1507 }
1508out_gunlock_r:
1509 if (r_gh.gh_gl)
1510 gfs2_glock_dq_uninit(&r_gh);
1511out:
1512 return error;
1513}
1514
1515/**
1516 * gfs2_exchange - exchange two files
1517 * @odir: Parent directory of old file name
1518 * @odentry: The old dentry of the file
1519 * @ndir: Parent directory of new file name
1520 * @ndentry: The new dentry of the file
1521 * @flags: The rename flags
1522 *
1523 * Returns: errno
1524 */
1525
1526static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1527 struct inode *ndir, struct dentry *ndentry,
1528 unsigned int flags)
1529{
1530 struct gfs2_inode *odip = GFS2_I(odir);
1531 struct gfs2_inode *ndip = GFS2_I(ndir);
1532 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1533 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1534 struct gfs2_sbd *sdp = GFS2_SB(odir);
1535 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1536 unsigned int num_gh;
1537 unsigned int x;
1538 umode_t old_mode = oip->i_inode.i_mode;
1539 umode_t new_mode = nip->i_inode.i_mode;
1540 int error;
1541
1542 error = gfs2_rindex_update(sdp);
1543 if (error)
1544 return error;
1545
1546 if (odip != ndip) {
1547 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1548 0, &r_gh);
1549 if (error)
1550 goto out;
1551
1552 if (S_ISDIR(old_mode)) {
1553 /* don't move a directory into its subdir */
1554 error = gfs2_ok_to_move(oip, ndip);
1555 if (error)
1556 goto out_gunlock_r;
1557 }
1558
1559 if (S_ISDIR(new_mode)) {
1560 /* don't move a directory into its subdir */
1561 error = gfs2_ok_to_move(nip, odip);
1562 if (error)
1563 goto out_gunlock_r;
1564 }
1565 }
1566
1567 num_gh = 1;
1568 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1569 if (odip != ndip) {
1570 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1571 num_gh++;
1572 }
1573 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1574 num_gh++;
1575
1576 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1577 num_gh++;
1578
1579 for (x = 0; x < num_gh; x++) {
1580 error = gfs2_glock_nq(ghs + x);
1581 if (error)
1582 goto out_gunlock;
1583 }
1584
1585 error = -ENOENT;
1586 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1587 goto out_gunlock;
1588
1589 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1590 if (error)
1591 goto out_gunlock;
1592 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1593 if (error)
1594 goto out_gunlock;
1595
1596 if (S_ISDIR(old_mode)) {
1597 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1598 if (error)
1599 goto out_gunlock;
1600 }
1601 if (S_ISDIR(new_mode)) {
1602 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1603 if (error)
1604 goto out_gunlock;
1605 }
1606 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1607 if (error)
1608 goto out_gunlock;
1609
1610 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1611 if (error)
1612 goto out_end_trans;
1613
1614 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1615 if (error)
1616 goto out_end_trans;
1617
1618 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1619 IF2DT(old_mode));
1620 if (error)
1621 goto out_end_trans;
1622
1623 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1624 IF2DT(new_mode));
1625 if (error)
1626 goto out_end_trans;
1627
1628 if (odip != ndip) {
1629 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1630 inc_nlink(&odip->i_inode);
1631 drop_nlink(&ndip->i_inode);
1632 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1633 inc_nlink(&ndip->i_inode);
1634 drop_nlink(&odip->i_inode);
1635 }
1636 }
1637 mark_inode_dirty(&ndip->i_inode);
1638 if (odip != ndip)
1639 mark_inode_dirty(&odip->i_inode);
1640
1641out_end_trans:
1642 gfs2_trans_end(sdp);
1643out_gunlock:
1644 while (x--) {
1645 gfs2_glock_dq(ghs + x);
1646 gfs2_holder_uninit(ghs + x);
1647 }
1648out_gunlock_r:
1649 if (r_gh.gh_gl)
1650 gfs2_glock_dq_uninit(&r_gh);
1651out:
1652 return error;
1653}
1654
1655static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1656 struct inode *ndir, struct dentry *ndentry,
1657 unsigned int flags)
1658{
1659 flags &= ~RENAME_NOREPLACE;
1660
1661 if (flags & ~RENAME_EXCHANGE)
1662 return -EINVAL;
1663
1664 if (flags & RENAME_EXCHANGE)
1665 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1666
1667 return gfs2_rename(odir, odentry, ndir, ndentry);
1668}
1669
1670/**
1671 * gfs2_get_link - Follow a symbolic link
1672 * @dentry: The dentry of the link
1673 * @inode: The inode of the link
1674 * @done: destructor for return value
1675 *
1676 * This can handle symlinks of any size.
1677 *
1678 * Returns: 0 on success or error code
1679 */
1680
1681static const char *gfs2_get_link(struct dentry *dentry,
1682 struct inode *inode,
1683 struct delayed_call *done)
1684{
1685 struct gfs2_inode *ip = GFS2_I(inode);
1686 struct gfs2_holder i_gh;
1687 struct buffer_head *dibh;
1688 unsigned int size;
1689 char *buf;
1690 int error;
1691
1692 if (!dentry)
1693 return ERR_PTR(-ECHILD);
1694
1695 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1696 error = gfs2_glock_nq(&i_gh);
1697 if (error) {
1698 gfs2_holder_uninit(&i_gh);
1699 return ERR_PTR(error);
1700 }
1701
1702 size = (unsigned int)i_size_read(&ip->i_inode);
1703 if (size == 0) {
1704 gfs2_consist_inode(ip);
1705 buf = ERR_PTR(-EIO);
1706 goto out;
1707 }
1708
1709 error = gfs2_meta_inode_buffer(ip, &dibh);
1710 if (error) {
1711 buf = ERR_PTR(error);
1712 goto out;
1713 }
1714
1715 buf = kzalloc(size + 1, GFP_NOFS);
1716 if (!buf)
1717 buf = ERR_PTR(-ENOMEM);
1718 else
1719 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1720 brelse(dibh);
1721out:
1722 gfs2_glock_dq_uninit(&i_gh);
1723 if (!IS_ERR(buf))
1724 set_delayed_call(done, kfree_link, buf);
1725 return buf;
1726}
1727
1728/**
1729 * gfs2_permission -
1730 * @inode: The inode
1731 * @mask: The mask to be tested
1732 * @flags: Indicates whether this is an RCU path walk or not
1733 *
1734 * This may be called from the VFS directly, or from within GFS2 with the
1735 * inode locked, so we look to see if the glock is already locked and only
1736 * lock the glock if its not already been done.
1737 *
1738 * Returns: errno
1739 */
1740
1741int gfs2_permission(struct inode *inode, int mask)
1742{
1743 struct gfs2_inode *ip;
1744 struct gfs2_holder i_gh;
1745 int error;
1746 int unlock = 0;
1747
1748
1749 ip = GFS2_I(inode);
1750 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1751 if (mask & MAY_NOT_BLOCK)
1752 return -ECHILD;
1753 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1754 if (error)
1755 return error;
1756 unlock = 1;
1757 }
1758
1759 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1760 error = -EACCES;
1761 else
1762 error = generic_permission(inode, mask);
1763 if (unlock)
1764 gfs2_glock_dq_uninit(&i_gh);
1765
1766 return error;
1767}
1768
1769static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1770{
1771 setattr_copy(inode, attr);
1772 mark_inode_dirty(inode);
1773 return 0;
1774}
1775
1776/**
1777 * gfs2_setattr_simple -
1778 * @ip:
1779 * @attr:
1780 *
1781 * Returns: errno
1782 */
1783
1784int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1785{
1786 int error;
1787
1788 if (current->journal_info)
1789 return __gfs2_setattr_simple(inode, attr);
1790
1791 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1792 if (error)
1793 return error;
1794
1795 error = __gfs2_setattr_simple(inode, attr);
1796 gfs2_trans_end(GFS2_SB(inode));
1797 return error;
1798}
1799
1800static int setattr_chown(struct inode *inode, struct iattr *attr)
1801{
1802 struct gfs2_inode *ip = GFS2_I(inode);
1803 struct gfs2_sbd *sdp = GFS2_SB(inode);
1804 kuid_t ouid, nuid;
1805 kgid_t ogid, ngid;
1806 int error;
1807 struct gfs2_alloc_parms ap;
1808
1809 ouid = inode->i_uid;
1810 ogid = inode->i_gid;
1811 nuid = attr->ia_uid;
1812 ngid = attr->ia_gid;
1813
1814 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1815 ouid = nuid = NO_UID_QUOTA_CHANGE;
1816 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1817 ogid = ngid = NO_GID_QUOTA_CHANGE;
1818
1819 error = gfs2_rsqa_alloc(ip);
1820 if (error)
1821 goto out;
1822
1823 error = gfs2_rindex_update(sdp);
1824 if (error)
1825 goto out;
1826
1827 error = gfs2_quota_lock(ip, nuid, ngid);
1828 if (error)
1829 goto out;
1830
1831 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1832
1833 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1834 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1835 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1836 if (error)
1837 goto out_gunlock_q;
1838 }
1839
1840 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1841 if (error)
1842 goto out_gunlock_q;
1843
1844 error = gfs2_setattr_simple(inode, attr);
1845 if (error)
1846 goto out_end_trans;
1847
1848 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1849 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1850 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1851 gfs2_quota_change(ip, ap.target, nuid, ngid);
1852 }
1853
1854out_end_trans:
1855 gfs2_trans_end(sdp);
1856out_gunlock_q:
1857 gfs2_quota_unlock(ip);
1858out:
1859 return error;
1860}
1861
1862/**
1863 * gfs2_setattr - Change attributes on an inode
1864 * @dentry: The dentry which is changing
1865 * @attr: The structure describing the change
1866 *
1867 * The VFS layer wants to change one or more of an inodes attributes. Write
1868 * that change out to disk.
1869 *
1870 * Returns: errno
1871 */
1872
1873static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1874{
1875 struct inode *inode = d_inode(dentry);
1876 struct gfs2_inode *ip = GFS2_I(inode);
1877 struct gfs2_holder i_gh;
1878 int error;
1879
1880 error = gfs2_rsqa_alloc(ip);
1881 if (error)
1882 return error;
1883
1884 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1885 if (error)
1886 return error;
1887
1888 error = -EPERM;
1889 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1890 goto out;
1891
1892 error = inode_change_ok(inode, attr);
1893 if (error)
1894 goto out;
1895
1896 if (attr->ia_valid & ATTR_SIZE)
1897 error = gfs2_setattr_size(inode, attr->ia_size);
1898 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1899 error = setattr_chown(inode, attr);
1900 else {
1901 error = gfs2_setattr_simple(inode, attr);
1902 if (!error && attr->ia_valid & ATTR_MODE)
1903 error = posix_acl_chmod(inode, inode->i_mode);
1904 }
1905
1906out:
1907 if (!error)
1908 mark_inode_dirty(inode);
1909 gfs2_glock_dq_uninit(&i_gh);
1910 return error;
1911}
1912
1913/**
1914 * gfs2_getattr - Read out an inode's attributes
1915 * @mnt: The vfsmount the inode is being accessed from
1916 * @dentry: The dentry to stat
1917 * @stat: The inode's stats
1918 *
1919 * This may be called from the VFS directly, or from within GFS2 with the
1920 * inode locked, so we look to see if the glock is already locked and only
1921 * lock the glock if its not already been done. Note that its the NFS
1922 * readdirplus operation which causes this to be called (from filldir)
1923 * with the glock already held.
1924 *
1925 * Returns: errno
1926 */
1927
1928static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1929 struct kstat *stat)
1930{
1931 struct inode *inode = d_inode(dentry);
1932 struct gfs2_inode *ip = GFS2_I(inode);
1933 struct gfs2_holder gh;
1934 int error;
1935 int unlock = 0;
1936
1937 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1938 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1939 if (error)
1940 return error;
1941 unlock = 1;
1942 }
1943
1944 generic_fillattr(inode, stat);
1945 if (unlock)
1946 gfs2_glock_dq_uninit(&gh);
1947
1948 return 0;
1949}
1950
1951static int gfs2_setxattr(struct dentry *dentry, const char *name,
1952 const void *data, size_t size, int flags)
1953{
1954 struct inode *inode = d_inode(dentry);
1955 struct gfs2_inode *ip = GFS2_I(inode);
1956 struct gfs2_holder gh;
1957 int ret;
1958
1959 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1960 ret = gfs2_glock_nq(&gh);
1961 if (ret == 0) {
1962 ret = gfs2_rsqa_alloc(ip);
1963 if (ret == 0)
1964 ret = generic_setxattr(dentry, name, data, size, flags);
1965 gfs2_glock_dq(&gh);
1966 }
1967 gfs2_holder_uninit(&gh);
1968 return ret;
1969}
1970
1971static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1972 void *data, size_t size)
1973{
1974 struct inode *inode = d_inode(dentry);
1975 struct gfs2_inode *ip = GFS2_I(inode);
1976 struct gfs2_holder gh;
1977 int ret;
1978
1979 /* For selinux during lookup */
1980 if (gfs2_glock_is_locked_by_me(ip->i_gl))
1981 return generic_getxattr(dentry, name, data, size);
1982
1983 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1984 ret = gfs2_glock_nq(&gh);
1985 if (ret == 0) {
1986 ret = generic_getxattr(dentry, name, data, size);
1987 gfs2_glock_dq(&gh);
1988 }
1989 gfs2_holder_uninit(&gh);
1990 return ret;
1991}
1992
1993static int gfs2_removexattr(struct dentry *dentry, const char *name)
1994{
1995 struct inode *inode = d_inode(dentry);
1996 struct gfs2_inode *ip = GFS2_I(inode);
1997 struct gfs2_holder gh;
1998 int ret;
1999
2000 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2001 ret = gfs2_glock_nq(&gh);
2002 if (ret == 0) {
2003 ret = gfs2_rsqa_alloc(ip);
2004 if (ret == 0)
2005 ret = generic_removexattr(dentry, name);
2006 gfs2_glock_dq(&gh);
2007 }
2008 gfs2_holder_uninit(&gh);
2009 return ret;
2010}
2011
2012static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2013 u64 start, u64 len)
2014{
2015 struct gfs2_inode *ip = GFS2_I(inode);
2016 struct gfs2_holder gh;
2017 int ret;
2018
2019 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2020 if (ret)
2021 return ret;
2022
2023 inode_lock(inode);
2024
2025 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2026 if (ret)
2027 goto out;
2028
2029 if (gfs2_is_stuffed(ip)) {
2030 u64 phys = ip->i_no_addr << inode->i_blkbits;
2031 u64 size = i_size_read(inode);
2032 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2033 FIEMAP_EXTENT_DATA_INLINE;
2034 phys += sizeof(struct gfs2_dinode);
2035 phys += start;
2036 if (start + len > size)
2037 len = size - start;
2038 if (start < size)
2039 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2040 len, flags);
2041 if (ret == 1)
2042 ret = 0;
2043 } else {
2044 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2045 gfs2_block_map);
2046 }
2047
2048 gfs2_glock_dq_uninit(&gh);
2049out:
2050 inode_unlock(inode);
2051 return ret;
2052}
2053
2054const struct inode_operations gfs2_file_iops = {
2055 .permission = gfs2_permission,
2056 .setattr = gfs2_setattr,
2057 .getattr = gfs2_getattr,
2058 .setxattr = gfs2_setxattr,
2059 .getxattr = gfs2_getxattr,
2060 .listxattr = gfs2_listxattr,
2061 .removexattr = gfs2_removexattr,
2062 .fiemap = gfs2_fiemap,
2063 .get_acl = gfs2_get_acl,
2064 .set_acl = gfs2_set_acl,
2065};
2066
2067const struct inode_operations gfs2_dir_iops = {
2068 .create = gfs2_create,
2069 .lookup = gfs2_lookup,
2070 .link = gfs2_link,
2071 .unlink = gfs2_unlink,
2072 .symlink = gfs2_symlink,
2073 .mkdir = gfs2_mkdir,
2074 .rmdir = gfs2_unlink,
2075 .mknod = gfs2_mknod,
2076 .rename2 = gfs2_rename2,
2077 .permission = gfs2_permission,
2078 .setattr = gfs2_setattr,
2079 .getattr = gfs2_getattr,
2080 .setxattr = gfs2_setxattr,
2081 .getxattr = gfs2_getxattr,
2082 .listxattr = gfs2_listxattr,
2083 .removexattr = gfs2_removexattr,
2084 .fiemap = gfs2_fiemap,
2085 .get_acl = gfs2_get_acl,
2086 .set_acl = gfs2_set_acl,
2087 .atomic_open = gfs2_atomic_open,
2088};
2089
2090const struct inode_operations gfs2_symlink_iops = {
2091 .readlink = generic_readlink,
2092 .get_link = gfs2_get_link,
2093 .permission = gfs2_permission,
2094 .setattr = gfs2_setattr,
2095 .getattr = gfs2_getattr,
2096 .setxattr = gfs2_setxattr,
2097 .getxattr = gfs2_getxattr,
2098 .listxattr = gfs2_listxattr,
2099 .removexattr = gfs2_removexattr,
2100 .fiemap = gfs2_fiemap,
2101};
2102
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/namei.h>
12#include <linux/mm.h>
13#include <linux/cred.h>
14#include <linux/xattr.h>
15#include <linux/posix_acl.h>
16#include <linux/gfs2_ondisk.h>
17#include <linux/crc32.h>
18#include <linux/iomap.h>
19#include <linux/security.h>
20#include <linux/fiemap.h>
21#include <linux/uaccess.h>
22
23#include "gfs2.h"
24#include "incore.h"
25#include "acl.h"
26#include "bmap.h"
27#include "dir.h"
28#include "xattr.h"
29#include "glock.h"
30#include "inode.h"
31#include "meta_io.h"
32#include "quota.h"
33#include "rgrp.h"
34#include "trans.h"
35#include "util.h"
36#include "super.h"
37#include "glops.h"
38
39static const struct inode_operations gfs2_file_iops;
40static const struct inode_operations gfs2_dir_iops;
41static const struct inode_operations gfs2_symlink_iops;
42
43/**
44 * gfs2_set_iop - Sets inode operations
45 * @inode: The inode with correct i_mode filled in
46 *
47 * GFS2 lookup code fills in vfs inode contents based on info obtained
48 * from directory entry inside gfs2_inode_lookup().
49 */
50
51static void gfs2_set_iop(struct inode *inode)
52{
53 struct gfs2_sbd *sdp = GFS2_SB(inode);
54 umode_t mode = inode->i_mode;
55
56 if (S_ISREG(mode)) {
57 inode->i_op = &gfs2_file_iops;
58 if (gfs2_localflocks(sdp))
59 inode->i_fop = &gfs2_file_fops_nolock;
60 else
61 inode->i_fop = &gfs2_file_fops;
62 } else if (S_ISDIR(mode)) {
63 inode->i_op = &gfs2_dir_iops;
64 if (gfs2_localflocks(sdp))
65 inode->i_fop = &gfs2_dir_fops_nolock;
66 else
67 inode->i_fop = &gfs2_dir_fops;
68 } else if (S_ISLNK(mode)) {
69 inode->i_op = &gfs2_symlink_iops;
70 } else {
71 inode->i_op = &gfs2_file_iops;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
73 }
74}
75
76static int iget_test(struct inode *inode, void *opaque)
77{
78 u64 no_addr = *(u64 *)opaque;
79
80 return GFS2_I(inode)->i_no_addr == no_addr;
81}
82
83static int iget_set(struct inode *inode, void *opaque)
84{
85 u64 no_addr = *(u64 *)opaque;
86
87 GFS2_I(inode)->i_no_addr = no_addr;
88 inode->i_ino = no_addr;
89 return 0;
90}
91
92/**
93 * gfs2_inode_lookup - Lookup an inode
94 * @sb: The super block
95 * @type: The type of the inode
96 * @no_addr: The inode number
97 * @no_formal_ino: The inode generation number
98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99 * GFS2_BLKST_FREE to indicate not to verify)
100 *
101 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
102 *
103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104 * placeholder because it doesn't otherwise make sense), the on-disk block type
105 * is verified to be @blktype.
106 *
107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108 * if it detects that @no_formal_ino doesn't match the actual inode generation
109 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
110 *
111 * Returns: A VFS inode, or an error
112 */
113
114struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115 u64 no_addr, u64 no_formal_ino,
116 unsigned int blktype)
117{
118 struct inode *inode;
119 struct gfs2_inode *ip;
120 struct gfs2_holder i_gh;
121 int error;
122
123 gfs2_holder_mark_uninitialized(&i_gh);
124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
125 if (!inode)
126 return ERR_PTR(-ENOMEM);
127
128 ip = GFS2_I(inode);
129
130 if (inode->i_state & I_NEW) {
131 struct gfs2_sbd *sdp = GFS2_SB(inode);
132 struct gfs2_glock *io_gl;
133 int extra_flags = 0;
134
135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
136 &ip->i_gl);
137 if (unlikely(error))
138 goto fail;
139
140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
141 &io_gl);
142 if (unlikely(error))
143 goto fail;
144
145 /*
146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147 * delete_work_func(). Make sure not to cancel the delete work
148 * from within itself here.
149 */
150 if (blktype == GFS2_BLKST_UNLINKED)
151 extra_flags |= LM_FLAG_TRY;
152 else
153 gfs2_cancel_delete_work(io_gl);
154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
155 GL_EXACT | GL_NOPID | extra_flags,
156 &ip->i_iopen_gh);
157 gfs2_glock_put(io_gl);
158 if (unlikely(error))
159 goto fail;
160
161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
162 /*
163 * The GL_SKIP flag indicates to skip reading the inode
164 * block. We read the inode when instantiating it
165 * after possibly checking the block type.
166 */
167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
168 GL_SKIP, &i_gh);
169 if (error)
170 goto fail;
171
172 error = -ESTALE;
173 if (no_formal_ino &&
174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
175 goto fail;
176
177 if (blktype != GFS2_BLKST_FREE) {
178 error = gfs2_check_blk_type(sdp, no_addr,
179 blktype);
180 if (error)
181 goto fail;
182 }
183 }
184
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
186
187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188 inode_set_atime(inode,
189 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1),
190 0);
191
192 glock_set_object(ip->i_gl, ip);
193
194 if (type == DT_UNKNOWN) {
195 /* Inode glock must be locked already */
196 error = gfs2_instantiate(&i_gh);
197 if (error) {
198 glock_clear_object(ip->i_gl, ip);
199 goto fail;
200 }
201 } else {
202 ip->i_no_formal_ino = no_formal_ino;
203 inode->i_mode = DT2IF(type);
204 }
205
206 if (gfs2_holder_initialized(&i_gh))
207 gfs2_glock_dq_uninit(&i_gh);
208 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
209
210 gfs2_set_iop(inode);
211 unlock_new_inode(inode);
212 }
213
214 if (no_formal_ino && ip->i_no_formal_ino &&
215 no_formal_ino != ip->i_no_formal_ino) {
216 iput(inode);
217 return ERR_PTR(-ESTALE);
218 }
219
220 return inode;
221
222fail:
223 if (error == GLR_TRYFAILED)
224 error = -EAGAIN;
225 if (gfs2_holder_initialized(&ip->i_iopen_gh))
226 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
227 if (gfs2_holder_initialized(&i_gh))
228 gfs2_glock_dq_uninit(&i_gh);
229 if (ip->i_gl) {
230 gfs2_glock_put(ip->i_gl);
231 ip->i_gl = NULL;
232 }
233 iget_failed(inode);
234 return ERR_PTR(error);
235}
236
237/**
238 * gfs2_lookup_by_inum - look up an inode by inode number
239 * @sdp: The super block
240 * @no_addr: The inode number
241 * @no_formal_ino: The inode generation number (0 for any)
242 * @blktype: Requested block type (see gfs2_inode_lookup)
243 */
244struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
245 u64 no_formal_ino, unsigned int blktype)
246{
247 struct super_block *sb = sdp->sd_vfs;
248 struct inode *inode;
249 int error;
250
251 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
252 blktype);
253 if (IS_ERR(inode))
254 return inode;
255
256 if (no_formal_ino) {
257 error = -EIO;
258 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
259 goto fail_iput;
260 }
261 return inode;
262
263fail_iput:
264 iput(inode);
265 return ERR_PTR(error);
266}
267
268
269/**
270 * gfs2_lookup_meta - Look up an inode in a metadata directory
271 * @dip: The directory
272 * @name: The name of the inode
273 */
274struct inode *gfs2_lookup_meta(struct inode *dip, const char *name)
275{
276 struct qstr qstr;
277 struct inode *inode;
278
279 gfs2_str2qstr(&qstr, name);
280 inode = gfs2_lookupi(dip, &qstr, 1);
281 if (IS_ERR_OR_NULL(inode))
282 return inode ? inode : ERR_PTR(-ENOENT);
283
284 /*
285 * Must not call back into the filesystem when allocating
286 * pages in the metadata inode's address space.
287 */
288 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
289
290 return inode;
291}
292
293
294/**
295 * gfs2_lookupi - Look up a filename in a directory and return its inode
296 * @dir: The inode of the directory containing the inode to look-up
297 * @name: The name of the inode to look for
298 * @is_root: If 1, ignore the caller's permissions
299 *
300 * This can be called via the VFS filldir function when NFS is doing
301 * a readdirplus and the inode which its intending to stat isn't
302 * already in cache. In this case we must not take the directory glock
303 * again, since the readdir call will have already taken that lock.
304 *
305 * Returns: errno
306 */
307
308struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
309 int is_root)
310{
311 struct super_block *sb = dir->i_sb;
312 struct gfs2_inode *dip = GFS2_I(dir);
313 struct gfs2_holder d_gh;
314 int error = 0;
315 struct inode *inode = NULL;
316
317 gfs2_holder_mark_uninitialized(&d_gh);
318 if (!name->len || name->len > GFS2_FNAMESIZE)
319 return ERR_PTR(-ENAMETOOLONG);
320
321 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
322 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
323 dir == d_inode(sb->s_root))) {
324 igrab(dir);
325 return dir;
326 }
327
328 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
329 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
330 if (error)
331 return ERR_PTR(error);
332 }
333
334 if (!is_root) {
335 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
336 if (error)
337 goto out;
338 }
339
340 inode = gfs2_dir_search(dir, name, false);
341 if (IS_ERR(inode))
342 error = PTR_ERR(inode);
343out:
344 if (gfs2_holder_initialized(&d_gh))
345 gfs2_glock_dq_uninit(&d_gh);
346 if (error == -ENOENT)
347 return NULL;
348 return inode ? inode : ERR_PTR(error);
349}
350
351/**
352 * create_ok - OK to create a new on-disk inode here?
353 * @dip: Directory in which dinode is to be created
354 * @name: Name of new dinode
355 * @mode:
356 *
357 * Returns: errno
358 */
359
360static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
361 umode_t mode)
362{
363 int error;
364
365 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
366 MAY_WRITE | MAY_EXEC);
367 if (error)
368 return error;
369
370 /* Don't create entries in an unlinked directory */
371 if (!dip->i_inode.i_nlink)
372 return -ENOENT;
373
374 if (dip->i_entries == (u32)-1)
375 return -EFBIG;
376 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
377 return -EMLINK;
378
379 return 0;
380}
381
382static void munge_mode_uid_gid(const struct gfs2_inode *dip,
383 struct inode *inode)
384{
385 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
386 (dip->i_inode.i_mode & S_ISUID) &&
387 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
388 if (S_ISDIR(inode->i_mode))
389 inode->i_mode |= S_ISUID;
390 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
391 inode->i_mode &= ~07111;
392 inode->i_uid = dip->i_inode.i_uid;
393 } else
394 inode->i_uid = current_fsuid();
395
396 if (dip->i_inode.i_mode & S_ISGID) {
397 if (S_ISDIR(inode->i_mode))
398 inode->i_mode |= S_ISGID;
399 inode->i_gid = dip->i_inode.i_gid;
400 } else
401 inode->i_gid = current_fsgid();
402}
403
404static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
405{
406 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
407 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
408 int error;
409
410 error = gfs2_quota_lock_check(ip, &ap);
411 if (error)
412 goto out;
413
414 error = gfs2_inplace_reserve(ip, &ap);
415 if (error)
416 goto out_quota;
417
418 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
419 if (error)
420 goto out_ipreserv;
421
422 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1);
423 if (error)
424 goto out_trans_end;
425
426 ip->i_no_formal_ino = ip->i_generation;
427 ip->i_inode.i_ino = ip->i_no_addr;
428 ip->i_goal = ip->i_no_addr;
429 if (*dblocks > 1)
430 ip->i_eattr = ip->i_no_addr + 1;
431
432out_trans_end:
433 gfs2_trans_end(sdp);
434out_ipreserv:
435 gfs2_inplace_release(ip);
436out_quota:
437 gfs2_quota_unlock(ip);
438out:
439 return error;
440}
441
442static void gfs2_init_dir(struct buffer_head *dibh,
443 const struct gfs2_inode *parent)
444{
445 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
446 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
447
448 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
449 dent->de_inum = di->di_num; /* already GFS2 endian */
450 dent->de_type = cpu_to_be16(DT_DIR);
451
452 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
453 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
454 gfs2_inum_out(parent, dent);
455 dent->de_type = cpu_to_be16(DT_DIR);
456
457}
458
459/**
460 * gfs2_init_xattr - Initialise an xattr block for a new inode
461 * @ip: The inode in question
462 *
463 * This sets up an empty xattr block for a new inode, ready to
464 * take any ACLs, LSM xattrs, etc.
465 */
466
467static void gfs2_init_xattr(struct gfs2_inode *ip)
468{
469 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
470 struct buffer_head *bh;
471 struct gfs2_ea_header *ea;
472
473 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
474 gfs2_trans_add_meta(ip->i_gl, bh);
475 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
476 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
477
478 ea = GFS2_EA_BH2FIRST(bh);
479 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
480 ea->ea_type = GFS2_EATYPE_UNUSED;
481 ea->ea_flags = GFS2_EAFLAG_LAST;
482
483 brelse(bh);
484}
485
486/**
487 * init_dinode - Fill in a new dinode structure
488 * @dip: The directory this inode is being created in
489 * @ip: The inode
490 * @symname: The symlink destination (if a symlink)
491 *
492 */
493
494static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
495 const char *symname)
496{
497 struct gfs2_dinode *di;
498 struct buffer_head *dibh;
499
500 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
501 gfs2_trans_add_meta(ip->i_gl, dibh);
502 di = (struct gfs2_dinode *)dibh->b_data;
503 gfs2_dinode_out(ip, di);
504
505 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
506 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
507 di->__pad1 = 0;
508 di->__pad2 = 0;
509 di->__pad3 = 0;
510 memset(&di->__pad4, 0, sizeof(di->__pad4));
511 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
512 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
513
514 switch(ip->i_inode.i_mode & S_IFMT) {
515 case S_IFDIR:
516 gfs2_init_dir(dibh, dip);
517 break;
518 case S_IFLNK:
519 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
520 break;
521 }
522
523 set_buffer_uptodate(dibh);
524 brelse(dibh);
525}
526
527/**
528 * gfs2_trans_da_blks - Calculate number of blocks to link inode
529 * @dip: The directory we are linking into
530 * @da: The dir add information
531 * @nr_inodes: The number of inodes involved
532 *
533 * This calculate the number of blocks we need to reserve in a
534 * transaction to link @nr_inodes into a directory. In most cases
535 * @nr_inodes will be 2 (the directory plus the inode being linked in)
536 * but in case of rename, 4 may be required.
537 *
538 * Returns: Number of blocks
539 */
540
541static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
542 const struct gfs2_diradd *da,
543 unsigned nr_inodes)
544{
545 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
546 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
547}
548
549static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
550 struct gfs2_inode *ip, struct gfs2_diradd *da)
551{
552 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
553 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
554 int error;
555
556 if (da->nr_blocks) {
557 error = gfs2_quota_lock_check(dip, &ap);
558 if (error)
559 goto fail_quota_locks;
560
561 error = gfs2_inplace_reserve(dip, &ap);
562 if (error)
563 goto fail_quota_locks;
564
565 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
566 if (error)
567 goto fail_ipreserv;
568 } else {
569 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
570 if (error)
571 goto fail_quota_locks;
572 }
573
574 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
575
576 gfs2_trans_end(sdp);
577fail_ipreserv:
578 gfs2_inplace_release(dip);
579fail_quota_locks:
580 gfs2_quota_unlock(dip);
581 return error;
582}
583
584static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
585 void *fs_info)
586{
587 const struct xattr *xattr;
588 int err = 0;
589
590 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
591 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
592 xattr->value_len, 0,
593 GFS2_EATYPE_SECURITY);
594 if (err < 0)
595 break;
596 }
597 return err;
598}
599
600/**
601 * gfs2_create_inode - Create a new inode
602 * @dir: The parent directory
603 * @dentry: The new dentry
604 * @file: If non-NULL, the file which is being opened
605 * @mode: The permissions on the new inode
606 * @dev: For device nodes, this is the device number
607 * @symname: For symlinks, this is the link destination
608 * @size: The initial size of the inode (ignored for directories)
609 * @excl: Force fail if inode exists
610 *
611 * FIXME: Change to allocate the disk blocks and write them out in the same
612 * transaction. That way, we can no longer end up in a situation in which an
613 * inode is allocated, the node crashes, and the block looks like a valid
614 * inode. (With atomic creates in place, we will also no longer need to zero
615 * the link count and dirty the inode here on failure.)
616 *
617 * Returns: 0 on success, or error code
618 */
619
620static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
621 struct file *file,
622 umode_t mode, dev_t dev, const char *symname,
623 unsigned int size, int excl)
624{
625 const struct qstr *name = &dentry->d_name;
626 struct posix_acl *default_acl, *acl;
627 struct gfs2_holder d_gh, gh;
628 struct inode *inode = NULL;
629 struct gfs2_inode *dip = GFS2_I(dir), *ip;
630 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
631 struct gfs2_glock *io_gl;
632 int error;
633 u32 aflags = 0;
634 unsigned blocks = 1;
635 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
636
637 if (!name->len || name->len > GFS2_FNAMESIZE)
638 return -ENAMETOOLONG;
639
640 error = gfs2_qa_get(dip);
641 if (error)
642 return error;
643
644 error = gfs2_rindex_update(sdp);
645 if (error)
646 goto fail;
647
648 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
649 if (error)
650 goto fail;
651 gfs2_holder_mark_uninitialized(&gh);
652
653 error = create_ok(dip, name, mode);
654 if (error)
655 goto fail_gunlock;
656
657 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
658 error = PTR_ERR(inode);
659 if (!IS_ERR(inode)) {
660 if (S_ISDIR(inode->i_mode)) {
661 iput(inode);
662 inode = ERR_PTR(-EISDIR);
663 goto fail_gunlock;
664 }
665 d_instantiate(dentry, inode);
666 error = 0;
667 if (file) {
668 if (S_ISREG(inode->i_mode))
669 error = finish_open(file, dentry, gfs2_open_common);
670 else
671 error = finish_no_open(file, NULL);
672 }
673 gfs2_glock_dq_uninit(&d_gh);
674 goto fail;
675 } else if (error != -ENOENT) {
676 goto fail_gunlock;
677 }
678
679 error = gfs2_diradd_alloc_required(dir, name, &da);
680 if (error < 0)
681 goto fail_gunlock;
682
683 inode = new_inode(sdp->sd_vfs);
684 error = -ENOMEM;
685 if (!inode)
686 goto fail_gunlock;
687 ip = GFS2_I(inode);
688
689 error = posix_acl_create(dir, &mode, &default_acl, &acl);
690 if (error)
691 goto fail_gunlock;
692
693 error = gfs2_qa_get(ip);
694 if (error)
695 goto fail_free_acls;
696
697 inode->i_mode = mode;
698 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
699 inode->i_rdev = dev;
700 inode->i_size = size;
701 simple_inode_init_ts(inode);
702 munge_mode_uid_gid(dip, inode);
703 check_and_update_goal(dip);
704 ip->i_goal = dip->i_goal;
705 ip->i_diskflags = 0;
706 ip->i_eattr = 0;
707 ip->i_height = 0;
708 ip->i_depth = 0;
709 ip->i_entries = 0;
710 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
711
712 switch(mode & S_IFMT) {
713 case S_IFREG:
714 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
715 gfs2_tune_get(sdp, gt_new_files_jdata))
716 ip->i_diskflags |= GFS2_DIF_JDATA;
717 gfs2_set_aops(inode);
718 break;
719 case S_IFDIR:
720 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
721 ip->i_diskflags |= GFS2_DIF_JDATA;
722 ip->i_entries = 2;
723 break;
724 }
725
726 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
727 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
728 ip->i_diskflags |= GFS2_DIF_SYSTEM;
729
730 gfs2_set_inode_flags(inode);
731
732 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
733 (dip->i_diskflags & GFS2_DIF_TOPDIR))
734 aflags |= GFS2_AF_ORLOV;
735
736 if (default_acl || acl)
737 blocks++;
738
739 error = alloc_dinode(ip, aflags, &blocks);
740 if (error)
741 goto fail_free_inode;
742
743 gfs2_set_inode_blocks(inode, blocks);
744
745 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
746 if (error)
747 goto fail_free_inode;
748
749 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
750 if (error)
751 goto fail_free_inode;
752 gfs2_cancel_delete_work(io_gl);
753
754retry:
755 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
756 if (error == -EBUSY)
757 goto retry;
758 if (error)
759 goto fail_gunlock2;
760
761 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
762 &ip->i_iopen_gh);
763 if (error)
764 goto fail_gunlock2;
765
766 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
767 if (error)
768 goto fail_gunlock3;
769
770 error = gfs2_trans_begin(sdp, blocks, 0);
771 if (error)
772 goto fail_gunlock3;
773
774 if (blocks > 1)
775 gfs2_init_xattr(ip);
776 init_dinode(dip, ip, symname);
777 gfs2_trans_end(sdp);
778
779 glock_set_object(ip->i_gl, ip);
780 glock_set_object(io_gl, ip);
781 gfs2_set_iop(inode);
782
783 if (default_acl) {
784 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
785 if (error)
786 goto fail_gunlock4;
787 posix_acl_release(default_acl);
788 default_acl = NULL;
789 }
790 if (acl) {
791 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
792 if (error)
793 goto fail_gunlock4;
794 posix_acl_release(acl);
795 acl = NULL;
796 }
797
798 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
799 &gfs2_initxattrs, NULL);
800 if (error)
801 goto fail_gunlock4;
802
803 error = link_dinode(dip, name, ip, &da);
804 if (error)
805 goto fail_gunlock4;
806
807 mark_inode_dirty(inode);
808 d_instantiate(dentry, inode);
809 /* After instantiate, errors should result in evict which will destroy
810 * both inode and iopen glocks properly. */
811 if (file) {
812 file->f_mode |= FMODE_CREATED;
813 error = finish_open(file, dentry, gfs2_open_common);
814 }
815 gfs2_glock_dq_uninit(&d_gh);
816 gfs2_qa_put(ip);
817 gfs2_glock_dq_uninit(&gh);
818 gfs2_glock_put(io_gl);
819 gfs2_qa_put(dip);
820 unlock_new_inode(inode);
821 return error;
822
823fail_gunlock4:
824 glock_clear_object(ip->i_gl, ip);
825 glock_clear_object(io_gl, ip);
826fail_gunlock3:
827 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
828fail_gunlock2:
829 gfs2_glock_put(io_gl);
830fail_free_inode:
831 if (ip->i_gl) {
832 gfs2_glock_put(ip->i_gl);
833 ip->i_gl = NULL;
834 }
835 gfs2_rs_deltree(&ip->i_res);
836 gfs2_qa_put(ip);
837fail_free_acls:
838 posix_acl_release(default_acl);
839 posix_acl_release(acl);
840fail_gunlock:
841 gfs2_dir_no_add(&da);
842 gfs2_glock_dq_uninit(&d_gh);
843 if (!IS_ERR_OR_NULL(inode)) {
844 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
845 clear_nlink(inode);
846 if (ip->i_no_addr)
847 mark_inode_dirty(inode);
848 if (inode->i_state & I_NEW)
849 iget_failed(inode);
850 else
851 iput(inode);
852 }
853 if (gfs2_holder_initialized(&gh))
854 gfs2_glock_dq_uninit(&gh);
855fail:
856 gfs2_qa_put(dip);
857 return error;
858}
859
860/**
861 * gfs2_create - Create a file
862 * @idmap: idmap of the mount the inode was found from
863 * @dir: The directory in which to create the file
864 * @dentry: The dentry of the new file
865 * @mode: The mode of the new file
866 * @excl: Force fail if inode exists
867 *
868 * Returns: errno
869 */
870
871static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
872 struct dentry *dentry, umode_t mode, bool excl)
873{
874 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
875}
876
877/**
878 * __gfs2_lookup - Look up a filename in a directory and return its inode
879 * @dir: The directory inode
880 * @dentry: The dentry of the new inode
881 * @file: File to be opened
882 *
883 *
884 * Returns: errno
885 */
886
887static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
888 struct file *file)
889{
890 struct inode *inode;
891 struct dentry *d;
892 struct gfs2_holder gh;
893 struct gfs2_glock *gl;
894 int error;
895
896 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
897 if (inode == NULL) {
898 d_add(dentry, NULL);
899 return NULL;
900 }
901 if (IS_ERR(inode))
902 return ERR_CAST(inode);
903
904 gl = GFS2_I(inode)->i_gl;
905 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
906 if (error) {
907 iput(inode);
908 return ERR_PTR(error);
909 }
910
911 d = d_splice_alias(inode, dentry);
912 if (IS_ERR(d)) {
913 gfs2_glock_dq_uninit(&gh);
914 return d;
915 }
916 if (file && S_ISREG(inode->i_mode))
917 error = finish_open(file, dentry, gfs2_open_common);
918
919 gfs2_glock_dq_uninit(&gh);
920 if (error) {
921 dput(d);
922 return ERR_PTR(error);
923 }
924 return d;
925}
926
927static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
928 unsigned flags)
929{
930 return __gfs2_lookup(dir, dentry, NULL);
931}
932
933/**
934 * gfs2_link - Link to a file
935 * @old_dentry: The inode to link
936 * @dir: Add link to this directory
937 * @dentry: The name of the link
938 *
939 * Link the inode in "old_dentry" into the directory "dir" with the
940 * name in "dentry".
941 *
942 * Returns: errno
943 */
944
945static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
946 struct dentry *dentry)
947{
948 struct gfs2_inode *dip = GFS2_I(dir);
949 struct gfs2_sbd *sdp = GFS2_SB(dir);
950 struct inode *inode = d_inode(old_dentry);
951 struct gfs2_inode *ip = GFS2_I(inode);
952 struct gfs2_holder d_gh, gh;
953 struct buffer_head *dibh;
954 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
955 int error;
956
957 if (S_ISDIR(inode->i_mode))
958 return -EPERM;
959
960 error = gfs2_qa_get(dip);
961 if (error)
962 return error;
963
964 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
965 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
966
967 error = gfs2_glock_nq(&d_gh);
968 if (error)
969 goto out_parent;
970
971 error = gfs2_glock_nq(&gh);
972 if (error)
973 goto out_child;
974
975 error = -ENOENT;
976 if (inode->i_nlink == 0)
977 goto out_gunlock;
978
979 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
980 if (error)
981 goto out_gunlock;
982
983 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
984 switch (error) {
985 case -ENOENT:
986 break;
987 case 0:
988 error = -EEXIST;
989 goto out_gunlock;
990 default:
991 goto out_gunlock;
992 }
993
994 error = -EINVAL;
995 if (!dip->i_inode.i_nlink)
996 goto out_gunlock;
997 error = -EFBIG;
998 if (dip->i_entries == (u32)-1)
999 goto out_gunlock;
1000 error = -EPERM;
1001 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1002 goto out_gunlock;
1003 error = -EMLINK;
1004 if (ip->i_inode.i_nlink == (u32)-1)
1005 goto out_gunlock;
1006
1007 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1008 if (error < 0)
1009 goto out_gunlock;
1010
1011 if (da.nr_blocks) {
1012 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1013 error = gfs2_quota_lock_check(dip, &ap);
1014 if (error)
1015 goto out_gunlock;
1016
1017 error = gfs2_inplace_reserve(dip, &ap);
1018 if (error)
1019 goto out_gunlock_q;
1020
1021 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1022 if (error)
1023 goto out_ipres;
1024 } else {
1025 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1026 if (error)
1027 goto out_ipres;
1028 }
1029
1030 error = gfs2_meta_inode_buffer(ip, &dibh);
1031 if (error)
1032 goto out_end_trans;
1033
1034 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1035 if (error)
1036 goto out_brelse;
1037
1038 gfs2_trans_add_meta(ip->i_gl, dibh);
1039 inc_nlink(&ip->i_inode);
1040 inode_set_ctime_current(&ip->i_inode);
1041 ihold(inode);
1042 d_instantiate(dentry, inode);
1043 mark_inode_dirty(inode);
1044
1045out_brelse:
1046 brelse(dibh);
1047out_end_trans:
1048 gfs2_trans_end(sdp);
1049out_ipres:
1050 if (da.nr_blocks)
1051 gfs2_inplace_release(dip);
1052out_gunlock_q:
1053 if (da.nr_blocks)
1054 gfs2_quota_unlock(dip);
1055out_gunlock:
1056 gfs2_dir_no_add(&da);
1057 gfs2_glock_dq(&gh);
1058out_child:
1059 gfs2_glock_dq(&d_gh);
1060out_parent:
1061 gfs2_qa_put(dip);
1062 gfs2_holder_uninit(&d_gh);
1063 gfs2_holder_uninit(&gh);
1064 return error;
1065}
1066
1067/*
1068 * gfs2_unlink_ok - check to see that a inode is still in a directory
1069 * @dip: the directory
1070 * @name: the name of the file
1071 * @ip: the inode
1072 *
1073 * Assumes that the lock on (at least) @dip is held.
1074 *
1075 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1076 */
1077
1078static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1079 const struct gfs2_inode *ip)
1080{
1081 int error;
1082
1083 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1084 return -EPERM;
1085
1086 if ((dip->i_inode.i_mode & S_ISVTX) &&
1087 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1088 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1089 return -EPERM;
1090
1091 if (IS_APPEND(&dip->i_inode))
1092 return -EPERM;
1093
1094 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1095 MAY_WRITE | MAY_EXEC);
1096 if (error)
1097 return error;
1098
1099 return gfs2_dir_check(&dip->i_inode, name, ip);
1100}
1101
1102/**
1103 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1104 * @dip: The parent directory
1105 * @dentry: The dentry to unlink
1106 *
1107 * Called with all the locks and in a transaction. This will only be
1108 * called for a directory after it has been checked to ensure it is empty.
1109 *
1110 * Returns: 0 on success, or an error
1111 */
1112
1113static int gfs2_unlink_inode(struct gfs2_inode *dip,
1114 const struct dentry *dentry)
1115{
1116 struct inode *inode = d_inode(dentry);
1117 struct gfs2_inode *ip = GFS2_I(inode);
1118 int error;
1119
1120 error = gfs2_dir_del(dip, dentry);
1121 if (error)
1122 return error;
1123
1124 ip->i_entries = 0;
1125 inode_set_ctime_current(inode);
1126 if (S_ISDIR(inode->i_mode))
1127 clear_nlink(inode);
1128 else
1129 drop_nlink(inode);
1130 mark_inode_dirty(inode);
1131 if (inode->i_nlink == 0)
1132 gfs2_unlink_di(inode);
1133 return 0;
1134}
1135
1136
1137/**
1138 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1139 * @dir: The inode of the directory containing the inode to unlink
1140 * @dentry: The file itself
1141 *
1142 * This routine uses the type of the inode as a flag to figure out
1143 * whether this is an unlink or an rmdir.
1144 *
1145 * Returns: errno
1146 */
1147
1148static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1149{
1150 struct gfs2_inode *dip = GFS2_I(dir);
1151 struct gfs2_sbd *sdp = GFS2_SB(dir);
1152 struct inode *inode = d_inode(dentry);
1153 struct gfs2_inode *ip = GFS2_I(inode);
1154 struct gfs2_holder d_gh, r_gh, gh;
1155 struct gfs2_rgrpd *rgd;
1156 int error;
1157
1158 error = gfs2_rindex_update(sdp);
1159 if (error)
1160 return error;
1161
1162 error = -EROFS;
1163
1164 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1165 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1166
1167 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1168 if (!rgd)
1169 goto out_inodes;
1170
1171 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1172
1173
1174 error = gfs2_glock_nq(&d_gh);
1175 if (error)
1176 goto out_parent;
1177
1178 error = gfs2_glock_nq(&gh);
1179 if (error)
1180 goto out_child;
1181
1182 error = -ENOENT;
1183 if (inode->i_nlink == 0)
1184 goto out_rgrp;
1185
1186 if (S_ISDIR(inode->i_mode)) {
1187 error = -ENOTEMPTY;
1188 if (ip->i_entries > 2 || inode->i_nlink > 2)
1189 goto out_rgrp;
1190 }
1191
1192 error = gfs2_glock_nq(&r_gh); /* rgrp */
1193 if (error)
1194 goto out_rgrp;
1195
1196 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1197 if (error)
1198 goto out_gunlock;
1199
1200 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1201 if (error)
1202 goto out_gunlock;
1203
1204 error = gfs2_unlink_inode(dip, dentry);
1205 gfs2_trans_end(sdp);
1206
1207out_gunlock:
1208 gfs2_glock_dq(&r_gh);
1209out_rgrp:
1210 gfs2_glock_dq(&gh);
1211out_child:
1212 gfs2_glock_dq(&d_gh);
1213out_parent:
1214 gfs2_holder_uninit(&r_gh);
1215out_inodes:
1216 gfs2_holder_uninit(&gh);
1217 gfs2_holder_uninit(&d_gh);
1218 return error;
1219}
1220
1221/**
1222 * gfs2_symlink - Create a symlink
1223 * @idmap: idmap of the mount the inode was found from
1224 * @dir: The directory to create the symlink in
1225 * @dentry: The dentry to put the symlink in
1226 * @symname: The thing which the link points to
1227 *
1228 * Returns: errno
1229 */
1230
1231static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1232 struct dentry *dentry, const char *symname)
1233{
1234 unsigned int size;
1235
1236 size = strlen(symname);
1237 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1238 return -ENAMETOOLONG;
1239
1240 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1241}
1242
1243/**
1244 * gfs2_mkdir - Make a directory
1245 * @idmap: idmap of the mount the inode was found from
1246 * @dir: The parent directory of the new one
1247 * @dentry: The dentry of the new directory
1248 * @mode: The mode of the new directory
1249 *
1250 * Returns: errno
1251 */
1252
1253static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1254 struct dentry *dentry, umode_t mode)
1255{
1256 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1257 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1258}
1259
1260/**
1261 * gfs2_mknod - Make a special file
1262 * @idmap: idmap of the mount the inode was found from
1263 * @dir: The directory in which the special file will reside
1264 * @dentry: The dentry of the special file
1265 * @mode: The mode of the special file
1266 * @dev: The device specification of the special file
1267 *
1268 */
1269
1270static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1271 struct dentry *dentry, umode_t mode, dev_t dev)
1272{
1273 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1274}
1275
1276/**
1277 * gfs2_atomic_open - Atomically open a file
1278 * @dir: The directory
1279 * @dentry: The proposed new entry
1280 * @file: The proposed new struct file
1281 * @flags: open flags
1282 * @mode: File mode
1283 *
1284 * Returns: error code or 0 for success
1285 */
1286
1287static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1288 struct file *file, unsigned flags,
1289 umode_t mode)
1290{
1291 struct dentry *d;
1292 bool excl = !!(flags & O_EXCL);
1293
1294 if (!d_in_lookup(dentry))
1295 goto skip_lookup;
1296
1297 d = __gfs2_lookup(dir, dentry, file);
1298 if (IS_ERR(d))
1299 return PTR_ERR(d);
1300 if (d != NULL)
1301 dentry = d;
1302 if (d_really_is_positive(dentry)) {
1303 if (!(file->f_mode & FMODE_OPENED))
1304 return finish_no_open(file, d);
1305 dput(d);
1306 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1307 }
1308
1309 BUG_ON(d != NULL);
1310
1311skip_lookup:
1312 if (!(flags & O_CREAT))
1313 return -ENOENT;
1314
1315 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1316}
1317
1318/*
1319 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1320 * @this: move this
1321 * @to: to here
1322 *
1323 * Follow @to back to the root and make sure we don't encounter @this
1324 * Assumes we already hold the rename lock.
1325 *
1326 * Returns: errno
1327 */
1328
1329static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1330{
1331 struct inode *dir = &to->i_inode;
1332 struct super_block *sb = dir->i_sb;
1333 struct inode *tmp;
1334 int error = 0;
1335
1336 igrab(dir);
1337
1338 for (;;) {
1339 if (dir == &this->i_inode) {
1340 error = -EINVAL;
1341 break;
1342 }
1343 if (dir == d_inode(sb->s_root)) {
1344 error = 0;
1345 break;
1346 }
1347
1348 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1349 if (!tmp) {
1350 error = -ENOENT;
1351 break;
1352 }
1353 if (IS_ERR(tmp)) {
1354 error = PTR_ERR(tmp);
1355 break;
1356 }
1357
1358 iput(dir);
1359 dir = tmp;
1360 }
1361
1362 iput(dir);
1363
1364 return error;
1365}
1366
1367/**
1368 * update_moved_ino - Update an inode that's being moved
1369 * @ip: The inode being moved
1370 * @ndip: The parent directory of the new filename
1371 * @dir_rename: True of ip is a directory
1372 *
1373 * Returns: errno
1374 */
1375
1376static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1377 int dir_rename)
1378{
1379 if (dir_rename)
1380 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1381
1382 inode_set_ctime_current(&ip->i_inode);
1383 mark_inode_dirty_sync(&ip->i_inode);
1384 return 0;
1385}
1386
1387
1388/**
1389 * gfs2_rename - Rename a file
1390 * @odir: Parent directory of old file name
1391 * @odentry: The old dentry of the file
1392 * @ndir: Parent directory of new file name
1393 * @ndentry: The new dentry of the file
1394 *
1395 * Returns: errno
1396 */
1397
1398static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1399 struct inode *ndir, struct dentry *ndentry)
1400{
1401 struct gfs2_inode *odip = GFS2_I(odir);
1402 struct gfs2_inode *ndip = GFS2_I(ndir);
1403 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1404 struct gfs2_inode *nip = NULL;
1405 struct gfs2_sbd *sdp = GFS2_SB(odir);
1406 struct gfs2_holder ghs[4], r_gh, rd_gh;
1407 struct gfs2_rgrpd *nrgd;
1408 unsigned int num_gh;
1409 int dir_rename = 0;
1410 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1411 unsigned int x;
1412 int error;
1413
1414 gfs2_holder_mark_uninitialized(&r_gh);
1415 gfs2_holder_mark_uninitialized(&rd_gh);
1416 if (d_really_is_positive(ndentry)) {
1417 nip = GFS2_I(d_inode(ndentry));
1418 if (ip == nip)
1419 return 0;
1420 }
1421
1422 error = gfs2_rindex_update(sdp);
1423 if (error)
1424 return error;
1425
1426 error = gfs2_qa_get(ndip);
1427 if (error)
1428 return error;
1429
1430 if (odip != ndip) {
1431 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1432 0, &r_gh);
1433 if (error)
1434 goto out;
1435
1436 if (S_ISDIR(ip->i_inode.i_mode)) {
1437 dir_rename = 1;
1438 /* don't move a directory into its subdir */
1439 error = gfs2_ok_to_move(ip, ndip);
1440 if (error)
1441 goto out_gunlock_r;
1442 }
1443 }
1444
1445 num_gh = 1;
1446 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1447 if (odip != ndip) {
1448 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1449 ghs + num_gh);
1450 num_gh++;
1451 }
1452 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1453 num_gh++;
1454
1455 if (nip) {
1456 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1457 ghs + num_gh);
1458 num_gh++;
1459 }
1460
1461 for (x = 0; x < num_gh; x++) {
1462 error = gfs2_glock_nq(ghs + x);
1463 if (error)
1464 goto out_gunlock;
1465 }
1466 error = gfs2_glock_async_wait(num_gh, ghs);
1467 if (error)
1468 goto out_gunlock;
1469
1470 if (nip) {
1471 /* Grab the resource group glock for unlink flag twiddling.
1472 * This is the case where the target dinode already exists
1473 * so we unlink before doing the rename.
1474 */
1475 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1476 if (!nrgd) {
1477 error = -ENOENT;
1478 goto out_gunlock;
1479 }
1480 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1481 LM_FLAG_NODE_SCOPE, &rd_gh);
1482 if (error)
1483 goto out_gunlock;
1484 }
1485
1486 error = -ENOENT;
1487 if (ip->i_inode.i_nlink == 0)
1488 goto out_gunlock;
1489
1490 /* Check out the old directory */
1491
1492 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1493 if (error)
1494 goto out_gunlock;
1495
1496 /* Check out the new directory */
1497
1498 if (nip) {
1499 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1500 if (error)
1501 goto out_gunlock;
1502
1503 if (nip->i_inode.i_nlink == 0) {
1504 error = -EAGAIN;
1505 goto out_gunlock;
1506 }
1507
1508 if (S_ISDIR(nip->i_inode.i_mode)) {
1509 if (nip->i_entries < 2) {
1510 gfs2_consist_inode(nip);
1511 error = -EIO;
1512 goto out_gunlock;
1513 }
1514 if (nip->i_entries > 2) {
1515 error = -ENOTEMPTY;
1516 goto out_gunlock;
1517 }
1518 }
1519 } else {
1520 error = gfs2_permission(&nop_mnt_idmap, ndir,
1521 MAY_WRITE | MAY_EXEC);
1522 if (error)
1523 goto out_gunlock;
1524
1525 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1526 switch (error) {
1527 case -ENOENT:
1528 error = 0;
1529 break;
1530 case 0:
1531 error = -EEXIST;
1532 goto out_gunlock;
1533 default:
1534 goto out_gunlock;
1535 }
1536
1537 if (odip != ndip) {
1538 if (!ndip->i_inode.i_nlink) {
1539 error = -ENOENT;
1540 goto out_gunlock;
1541 }
1542 if (ndip->i_entries == (u32)-1) {
1543 error = -EFBIG;
1544 goto out_gunlock;
1545 }
1546 if (S_ISDIR(ip->i_inode.i_mode) &&
1547 ndip->i_inode.i_nlink == (u32)-1) {
1548 error = -EMLINK;
1549 goto out_gunlock;
1550 }
1551 }
1552 }
1553
1554 /* Check out the dir to be renamed */
1555
1556 if (dir_rename) {
1557 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1558 MAY_WRITE);
1559 if (error)
1560 goto out_gunlock;
1561 }
1562
1563 if (nip == NULL) {
1564 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1565 if (error)
1566 goto out_gunlock;
1567 }
1568
1569 if (da.nr_blocks) {
1570 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1571 error = gfs2_quota_lock_check(ndip, &ap);
1572 if (error)
1573 goto out_gunlock;
1574
1575 error = gfs2_inplace_reserve(ndip, &ap);
1576 if (error)
1577 goto out_gunlock_q;
1578
1579 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1580 4 * RES_LEAF + 4, 0);
1581 if (error)
1582 goto out_ipreserv;
1583 } else {
1584 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1585 5 * RES_LEAF + 4, 0);
1586 if (error)
1587 goto out_gunlock;
1588 }
1589
1590 /* Remove the target file, if it exists */
1591
1592 if (nip)
1593 error = gfs2_unlink_inode(ndip, ndentry);
1594
1595 error = update_moved_ino(ip, ndip, dir_rename);
1596 if (error)
1597 goto out_end_trans;
1598
1599 error = gfs2_dir_del(odip, odentry);
1600 if (error)
1601 goto out_end_trans;
1602
1603 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1604 if (error)
1605 goto out_end_trans;
1606
1607out_end_trans:
1608 gfs2_trans_end(sdp);
1609out_ipreserv:
1610 if (da.nr_blocks)
1611 gfs2_inplace_release(ndip);
1612out_gunlock_q:
1613 if (da.nr_blocks)
1614 gfs2_quota_unlock(ndip);
1615out_gunlock:
1616 gfs2_dir_no_add(&da);
1617 if (gfs2_holder_initialized(&rd_gh))
1618 gfs2_glock_dq_uninit(&rd_gh);
1619
1620 while (x--) {
1621 if (gfs2_holder_queued(ghs + x))
1622 gfs2_glock_dq(ghs + x);
1623 gfs2_holder_uninit(ghs + x);
1624 }
1625out_gunlock_r:
1626 if (gfs2_holder_initialized(&r_gh))
1627 gfs2_glock_dq_uninit(&r_gh);
1628out:
1629 gfs2_qa_put(ndip);
1630 return error;
1631}
1632
1633/**
1634 * gfs2_exchange - exchange two files
1635 * @odir: Parent directory of old file name
1636 * @odentry: The old dentry of the file
1637 * @ndir: Parent directory of new file name
1638 * @ndentry: The new dentry of the file
1639 * @flags: The rename flags
1640 *
1641 * Returns: errno
1642 */
1643
1644static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1645 struct inode *ndir, struct dentry *ndentry,
1646 unsigned int flags)
1647{
1648 struct gfs2_inode *odip = GFS2_I(odir);
1649 struct gfs2_inode *ndip = GFS2_I(ndir);
1650 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1651 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1652 struct gfs2_sbd *sdp = GFS2_SB(odir);
1653 struct gfs2_holder ghs[4], r_gh;
1654 unsigned int num_gh;
1655 unsigned int x;
1656 umode_t old_mode = oip->i_inode.i_mode;
1657 umode_t new_mode = nip->i_inode.i_mode;
1658 int error;
1659
1660 gfs2_holder_mark_uninitialized(&r_gh);
1661 error = gfs2_rindex_update(sdp);
1662 if (error)
1663 return error;
1664
1665 if (odip != ndip) {
1666 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1667 0, &r_gh);
1668 if (error)
1669 goto out;
1670
1671 if (S_ISDIR(old_mode)) {
1672 /* don't move a directory into its subdir */
1673 error = gfs2_ok_to_move(oip, ndip);
1674 if (error)
1675 goto out_gunlock_r;
1676 }
1677
1678 if (S_ISDIR(new_mode)) {
1679 /* don't move a directory into its subdir */
1680 error = gfs2_ok_to_move(nip, odip);
1681 if (error)
1682 goto out_gunlock_r;
1683 }
1684 }
1685
1686 num_gh = 1;
1687 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1688 if (odip != ndip) {
1689 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1690 ghs + num_gh);
1691 num_gh++;
1692 }
1693 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1694 num_gh++;
1695
1696 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1697 num_gh++;
1698
1699 for (x = 0; x < num_gh; x++) {
1700 error = gfs2_glock_nq(ghs + x);
1701 if (error)
1702 goto out_gunlock;
1703 }
1704
1705 error = gfs2_glock_async_wait(num_gh, ghs);
1706 if (error)
1707 goto out_gunlock;
1708
1709 error = -ENOENT;
1710 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1711 goto out_gunlock;
1712
1713 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1714 if (error)
1715 goto out_gunlock;
1716 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1717 if (error)
1718 goto out_gunlock;
1719
1720 if (S_ISDIR(old_mode)) {
1721 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1722 MAY_WRITE);
1723 if (error)
1724 goto out_gunlock;
1725 }
1726 if (S_ISDIR(new_mode)) {
1727 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1728 MAY_WRITE);
1729 if (error)
1730 goto out_gunlock;
1731 }
1732 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1733 if (error)
1734 goto out_gunlock;
1735
1736 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1737 if (error)
1738 goto out_end_trans;
1739
1740 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1741 if (error)
1742 goto out_end_trans;
1743
1744 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1745 IF2DT(old_mode));
1746 if (error)
1747 goto out_end_trans;
1748
1749 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1750 IF2DT(new_mode));
1751 if (error)
1752 goto out_end_trans;
1753
1754 if (odip != ndip) {
1755 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1756 inc_nlink(&odip->i_inode);
1757 drop_nlink(&ndip->i_inode);
1758 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1759 inc_nlink(&ndip->i_inode);
1760 drop_nlink(&odip->i_inode);
1761 }
1762 }
1763 mark_inode_dirty(&ndip->i_inode);
1764 if (odip != ndip)
1765 mark_inode_dirty(&odip->i_inode);
1766
1767out_end_trans:
1768 gfs2_trans_end(sdp);
1769out_gunlock:
1770 while (x--) {
1771 if (gfs2_holder_queued(ghs + x))
1772 gfs2_glock_dq(ghs + x);
1773 gfs2_holder_uninit(ghs + x);
1774 }
1775out_gunlock_r:
1776 if (gfs2_holder_initialized(&r_gh))
1777 gfs2_glock_dq_uninit(&r_gh);
1778out:
1779 return error;
1780}
1781
1782static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1783 struct dentry *odentry, struct inode *ndir,
1784 struct dentry *ndentry, unsigned int flags)
1785{
1786 flags &= ~RENAME_NOREPLACE;
1787
1788 if (flags & ~RENAME_EXCHANGE)
1789 return -EINVAL;
1790
1791 if (flags & RENAME_EXCHANGE)
1792 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1793
1794 return gfs2_rename(odir, odentry, ndir, ndentry);
1795}
1796
1797/**
1798 * gfs2_get_link - Follow a symbolic link
1799 * @dentry: The dentry of the link
1800 * @inode: The inode of the link
1801 * @done: destructor for return value
1802 *
1803 * This can handle symlinks of any size.
1804 *
1805 * Returns: 0 on success or error code
1806 */
1807
1808static const char *gfs2_get_link(struct dentry *dentry,
1809 struct inode *inode,
1810 struct delayed_call *done)
1811{
1812 struct gfs2_inode *ip = GFS2_I(inode);
1813 struct gfs2_holder i_gh;
1814 struct buffer_head *dibh;
1815 unsigned int size;
1816 char *buf;
1817 int error;
1818
1819 if (!dentry)
1820 return ERR_PTR(-ECHILD);
1821
1822 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1823 error = gfs2_glock_nq(&i_gh);
1824 if (error) {
1825 gfs2_holder_uninit(&i_gh);
1826 return ERR_PTR(error);
1827 }
1828
1829 size = (unsigned int)i_size_read(&ip->i_inode);
1830 if (size == 0) {
1831 gfs2_consist_inode(ip);
1832 buf = ERR_PTR(-EIO);
1833 goto out;
1834 }
1835
1836 error = gfs2_meta_inode_buffer(ip, &dibh);
1837 if (error) {
1838 buf = ERR_PTR(error);
1839 goto out;
1840 }
1841
1842 buf = kzalloc(size + 1, GFP_NOFS);
1843 if (!buf)
1844 buf = ERR_PTR(-ENOMEM);
1845 else
1846 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1847 brelse(dibh);
1848out:
1849 gfs2_glock_dq_uninit(&i_gh);
1850 if (!IS_ERR(buf))
1851 set_delayed_call(done, kfree_link, buf);
1852 return buf;
1853}
1854
1855/**
1856 * gfs2_permission
1857 * @idmap: idmap of the mount the inode was found from
1858 * @inode: The inode
1859 * @mask: The mask to be tested
1860 *
1861 * This may be called from the VFS directly, or from within GFS2 with the
1862 * inode locked, so we look to see if the glock is already locked and only
1863 * lock the glock if its not already been done.
1864 *
1865 * Returns: errno
1866 */
1867
1868int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1869 int mask)
1870{
1871 int may_not_block = mask & MAY_NOT_BLOCK;
1872 struct gfs2_inode *ip;
1873 struct gfs2_holder i_gh;
1874 struct gfs2_glock *gl;
1875 int error;
1876
1877 gfs2_holder_mark_uninitialized(&i_gh);
1878 ip = GFS2_I(inode);
1879 gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1880 if (unlikely(!gl)) {
1881 /* inode is getting torn down, must be RCU mode */
1882 WARN_ON_ONCE(!may_not_block);
1883 return -ECHILD;
1884 }
1885 if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1886 if (may_not_block)
1887 return -ECHILD;
1888 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1889 if (error)
1890 return error;
1891 }
1892
1893 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1894 error = -EPERM;
1895 else
1896 error = generic_permission(&nop_mnt_idmap, inode, mask);
1897 if (gfs2_holder_initialized(&i_gh))
1898 gfs2_glock_dq_uninit(&i_gh);
1899
1900 return error;
1901}
1902
1903static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1904{
1905 setattr_copy(&nop_mnt_idmap, inode, attr);
1906 mark_inode_dirty(inode);
1907 return 0;
1908}
1909
1910static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1911{
1912 int error;
1913
1914 if (current->journal_info)
1915 return __gfs2_setattr_simple(inode, attr);
1916
1917 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1918 if (error)
1919 return error;
1920
1921 error = __gfs2_setattr_simple(inode, attr);
1922 gfs2_trans_end(GFS2_SB(inode));
1923 return error;
1924}
1925
1926static int setattr_chown(struct inode *inode, struct iattr *attr)
1927{
1928 struct gfs2_inode *ip = GFS2_I(inode);
1929 struct gfs2_sbd *sdp = GFS2_SB(inode);
1930 kuid_t ouid, nuid;
1931 kgid_t ogid, ngid;
1932 int error;
1933 struct gfs2_alloc_parms ap = {};
1934
1935 ouid = inode->i_uid;
1936 ogid = inode->i_gid;
1937 nuid = attr->ia_uid;
1938 ngid = attr->ia_gid;
1939
1940 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1941 ouid = nuid = NO_UID_QUOTA_CHANGE;
1942 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1943 ogid = ngid = NO_GID_QUOTA_CHANGE;
1944 error = gfs2_qa_get(ip);
1945 if (error)
1946 return error;
1947
1948 error = gfs2_rindex_update(sdp);
1949 if (error)
1950 goto out;
1951
1952 error = gfs2_quota_lock(ip, nuid, ngid);
1953 if (error)
1954 goto out;
1955
1956 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1957
1958 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1959 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1960 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1961 if (error)
1962 goto out_gunlock_q;
1963 }
1964
1965 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1966 if (error)
1967 goto out_gunlock_q;
1968
1969 error = gfs2_setattr_simple(inode, attr);
1970 if (error)
1971 goto out_end_trans;
1972
1973 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1974 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1975 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1976 gfs2_quota_change(ip, ap.target, nuid, ngid);
1977 }
1978
1979out_end_trans:
1980 gfs2_trans_end(sdp);
1981out_gunlock_q:
1982 gfs2_quota_unlock(ip);
1983out:
1984 gfs2_qa_put(ip);
1985 return error;
1986}
1987
1988/**
1989 * gfs2_setattr - Change attributes on an inode
1990 * @idmap: idmap of the mount the inode was found from
1991 * @dentry: The dentry which is changing
1992 * @attr: The structure describing the change
1993 *
1994 * The VFS layer wants to change one or more of an inodes attributes. Write
1995 * that change out to disk.
1996 *
1997 * Returns: errno
1998 */
1999
2000static int gfs2_setattr(struct mnt_idmap *idmap,
2001 struct dentry *dentry, struct iattr *attr)
2002{
2003 struct inode *inode = d_inode(dentry);
2004 struct gfs2_inode *ip = GFS2_I(inode);
2005 struct gfs2_holder i_gh;
2006 int error;
2007
2008 error = gfs2_qa_get(ip);
2009 if (error)
2010 return error;
2011
2012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2013 if (error)
2014 goto out;
2015
2016 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2017 if (error)
2018 goto error;
2019
2020 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2021 if (error)
2022 goto error;
2023
2024 if (attr->ia_valid & ATTR_SIZE)
2025 error = gfs2_setattr_size(inode, attr->ia_size);
2026 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2027 error = setattr_chown(inode, attr);
2028 else {
2029 error = gfs2_setattr_simple(inode, attr);
2030 if (!error && attr->ia_valid & ATTR_MODE)
2031 error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2032 inode->i_mode);
2033 }
2034
2035error:
2036 if (!error)
2037 mark_inode_dirty(inode);
2038 gfs2_glock_dq_uninit(&i_gh);
2039out:
2040 gfs2_qa_put(ip);
2041 return error;
2042}
2043
2044/**
2045 * gfs2_getattr - Read out an inode's attributes
2046 * @idmap: idmap of the mount the inode was found from
2047 * @path: Object to query
2048 * @stat: The inode's stats
2049 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2050 * @flags: AT_STATX_xxx setting
2051 *
2052 * This may be called from the VFS directly, or from within GFS2 with the
2053 * inode locked, so we look to see if the glock is already locked and only
2054 * lock the glock if its not already been done. Note that its the NFS
2055 * readdirplus operation which causes this to be called (from filldir)
2056 * with the glock already held.
2057 *
2058 * Returns: errno
2059 */
2060
2061static int gfs2_getattr(struct mnt_idmap *idmap,
2062 const struct path *path, struct kstat *stat,
2063 u32 request_mask, unsigned int flags)
2064{
2065 struct inode *inode = d_inode(path->dentry);
2066 struct gfs2_inode *ip = GFS2_I(inode);
2067 struct gfs2_holder gh;
2068 u32 gfsflags;
2069 int error;
2070
2071 gfs2_holder_mark_uninitialized(&gh);
2072 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2073 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2074 if (error)
2075 return error;
2076 }
2077
2078 gfsflags = ip->i_diskflags;
2079 if (gfsflags & GFS2_DIF_APPENDONLY)
2080 stat->attributes |= STATX_ATTR_APPEND;
2081 if (gfsflags & GFS2_DIF_IMMUTABLE)
2082 stat->attributes |= STATX_ATTR_IMMUTABLE;
2083
2084 stat->attributes_mask |= (STATX_ATTR_APPEND |
2085 STATX_ATTR_COMPRESSED |
2086 STATX_ATTR_ENCRYPTED |
2087 STATX_ATTR_IMMUTABLE |
2088 STATX_ATTR_NODUMP);
2089
2090 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2091
2092 if (gfs2_holder_initialized(&gh))
2093 gfs2_glock_dq_uninit(&gh);
2094
2095 return 0;
2096}
2097
2098static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2099 u64 start, u64 len)
2100{
2101 struct gfs2_inode *ip = GFS2_I(inode);
2102 struct gfs2_holder gh;
2103 int ret;
2104
2105 inode_lock_shared(inode);
2106
2107 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2108 if (ret)
2109 goto out;
2110
2111 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2112
2113 gfs2_glock_dq_uninit(&gh);
2114
2115out:
2116 inode_unlock_shared(inode);
2117 return ret;
2118}
2119
2120loff_t gfs2_seek_data(struct file *file, loff_t offset)
2121{
2122 struct inode *inode = file->f_mapping->host;
2123 struct gfs2_inode *ip = GFS2_I(inode);
2124 struct gfs2_holder gh;
2125 loff_t ret;
2126
2127 inode_lock_shared(inode);
2128 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2129 if (!ret)
2130 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2131 gfs2_glock_dq_uninit(&gh);
2132 inode_unlock_shared(inode);
2133
2134 if (ret < 0)
2135 return ret;
2136 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2137}
2138
2139loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2140{
2141 struct inode *inode = file->f_mapping->host;
2142 struct gfs2_inode *ip = GFS2_I(inode);
2143 struct gfs2_holder gh;
2144 loff_t ret;
2145
2146 inode_lock_shared(inode);
2147 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2148 if (!ret)
2149 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2150 gfs2_glock_dq_uninit(&gh);
2151 inode_unlock_shared(inode);
2152
2153 if (ret < 0)
2154 return ret;
2155 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2156}
2157
2158static int gfs2_update_time(struct inode *inode, int flags)
2159{
2160 struct gfs2_inode *ip = GFS2_I(inode);
2161 struct gfs2_glock *gl = ip->i_gl;
2162 struct gfs2_holder *gh;
2163 int error;
2164
2165 gh = gfs2_glock_is_locked_by_me(gl);
2166 if (gh && gl->gl_state != LM_ST_EXCLUSIVE) {
2167 gfs2_glock_dq(gh);
2168 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2169 error = gfs2_glock_nq(gh);
2170 if (error)
2171 return error;
2172 }
2173 generic_update_time(inode, flags);
2174 return 0;
2175}
2176
2177static const struct inode_operations gfs2_file_iops = {
2178 .permission = gfs2_permission,
2179 .setattr = gfs2_setattr,
2180 .getattr = gfs2_getattr,
2181 .listxattr = gfs2_listxattr,
2182 .fiemap = gfs2_fiemap,
2183 .get_inode_acl = gfs2_get_acl,
2184 .set_acl = gfs2_set_acl,
2185 .update_time = gfs2_update_time,
2186 .fileattr_get = gfs2_fileattr_get,
2187 .fileattr_set = gfs2_fileattr_set,
2188};
2189
2190static const struct inode_operations gfs2_dir_iops = {
2191 .create = gfs2_create,
2192 .lookup = gfs2_lookup,
2193 .link = gfs2_link,
2194 .unlink = gfs2_unlink,
2195 .symlink = gfs2_symlink,
2196 .mkdir = gfs2_mkdir,
2197 .rmdir = gfs2_unlink,
2198 .mknod = gfs2_mknod,
2199 .rename = gfs2_rename2,
2200 .permission = gfs2_permission,
2201 .setattr = gfs2_setattr,
2202 .getattr = gfs2_getattr,
2203 .listxattr = gfs2_listxattr,
2204 .fiemap = gfs2_fiemap,
2205 .get_inode_acl = gfs2_get_acl,
2206 .set_acl = gfs2_set_acl,
2207 .update_time = gfs2_update_time,
2208 .atomic_open = gfs2_atomic_open,
2209 .fileattr_get = gfs2_fileattr_get,
2210 .fileattr_set = gfs2_fileattr_set,
2211};
2212
2213static const struct inode_operations gfs2_symlink_iops = {
2214 .get_link = gfs2_get_link,
2215 .permission = gfs2_permission,
2216 .setattr = gfs2_setattr,
2217 .getattr = gfs2_getattr,
2218 .listxattr = gfs2_listxattr,
2219 .fiemap = gfs2_fiemap,
2220};
2221