projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / inode.c
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
40 struct gfs2_skip_data {
41 u64 no_addr;
42 int skipped;
43 int non_block;
44 };
45
46 static int iget_test(struct inode *inode, void *opaque)
47 {
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
50
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
54 data->skipped = 1;
55 return 0;
56 }
57 return 1;
58 }
59 return 0;
60 }
61
62 static int iget_set(struct inode *inode, void *opaque)
63 {
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
66
67 if (data->skipped)
68 return -ENOENT;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
71 return 0;
72 }
73
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
75 {
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
78
79 data.no_addr = no_addr;
80 data.skipped = 0;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
83 }
84
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
86 int non_block)
87 {
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
90
91 data.no_addr = no_addr;
92 data.skipped = 0;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
95 }
96
97 /**
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
100 *
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
103 */
104
105 static void gfs2_set_iop(struct inode *inode)
106 {
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
109
110 if (S_ISREG(mode)) {
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
114 else
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
120 else
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
124 } else {
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
127 }
128 }
129
130 /**
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
136 *
137 * Returns: A VFS inode, or an error
138 */
139
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
142 {
143 struct inode *inode;
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
146 int error;
147
148 inode = gfs2_iget(sb, no_addr, non_block);
149 ip = GFS2_I(inode);
150
151 if (!inode)
152 return ERR_PTR(-ENOBUFS);
153
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
157
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
159 if (unlikely(error))
160 goto fail;
161 ip->i_gl->gl_object = ip;
162
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
164 if (unlikely(error))
165 goto fail_put;
166
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
169 if (unlikely(error))
170 goto fail_iopen;
171
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
174 io_gl = NULL;
175
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
179 if (error)
180 goto fail_refresh;
181 } else {
182 inode->i_mode = DT2IF(type);
183 }
184
185 gfs2_set_iop(inode);
186 unlock_new_inode(inode);
187 }
188
189 return inode;
190
191 fail_refresh:
192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
193 ip->i_iopen_gh.gh_gl->gl_object = NULL;
194 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
195 fail_iopen:
196 if (io_gl)
197 gfs2_glock_put(io_gl);
198 fail_put:
199 ip->i_gl->gl_object = NULL;
200 gfs2_glock_put(ip->i_gl);
201 fail:
202 iget_failed(inode);
203 return ERR_PTR(error);
204 }
205
206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
207 u64 *no_formal_ino, unsigned int blktype)
208 {
209 struct super_block *sb = sdp->sd_vfs;
210 struct gfs2_holder i_gh;
211 struct inode *inode = NULL;
212 int error;
213
214 /* Must not read in block until block type is verified */
215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 if (error)
218 return ERR_PTR(error);
219
220 error = gfs2_check_blk_type(sdp, no_addr, blktype);
221 if (error)
222 goto fail;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
225 if (IS_ERR(inode))
226 goto fail;
227
228 /* Two extra checks for NFS only */
229 if (no_formal_ino) {
230 error = -ESTALE;
231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
232 goto fail_iput;
233
234 error = -EIO;
235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
236 goto fail_iput;
237
238 error = 0;
239 }
240
241 fail:
242 gfs2_glock_dq_uninit(&i_gh);
243 return error ? ERR_PTR(error) : inode;
244 fail_iput:
245 iput(inode);
246 goto fail;
247 }
248
249
250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
251 {
252 struct qstr qstr;
253 struct inode *inode;
254 gfs2_str2qstr(&qstr, name);
255 inode = gfs2_lookupi(dip, &qstr, 1);
256 /* gfs2_lookupi has inconsistent callers: vfs
257 * related routines expect NULL for no entry found,
258 * gfs2_lookup_simple callers expect ENOENT
259 * and do not check for NULL.
260 */
261 if (inode == NULL)
262 return ERR_PTR(-ENOENT);
263 else
264 return inode;
265 }
266
267
268 /**
269 * gfs2_lookupi - Look up a filename in a directory and return its inode
270 * @d_gh: An initialized holder for the directory glock
271 * @name: The name of the inode to look for
272 * @is_root: If 1, ignore the caller's permissions
273 * @i_gh: An uninitialized holder for the new inode glock
274 *
275 * This can be called via the VFS filldir function when NFS is doing
276 * a readdirplus and the inode which its intending to stat isn't
277 * already in cache. In this case we must not take the directory glock
278 * again, since the readdir call will have already taken that lock.
279 *
280 * Returns: errno
281 */
282
283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
284 int is_root)
285 {
286 struct super_block *sb = dir->i_sb;
287 struct gfs2_inode *dip = GFS2_I(dir);
288 struct gfs2_holder d_gh;
289 int error = 0;
290 struct inode *inode = NULL;
291 int unlock = 0;
292
293 if (!name->len || name->len > GFS2_FNAMESIZE)
294 return ERR_PTR(-ENAMETOOLONG);
295
296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
298 dir == sb->s_root->d_inode)) {
299 igrab(dir);
300 return dir;
301 }
302
303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 if (error)
306 return ERR_PTR(error);
307 unlock = 1;
308 }
309
310 if (!is_root) {
311 error = gfs2_permission(dir, MAY_EXEC);
312 if (error)
313 goto out;
314 }
315
316 inode = gfs2_dir_search(dir, name);
317 if (IS_ERR(inode))
318 error = PTR_ERR(inode);
319 out:
320 if (unlock)
321 gfs2_glock_dq_uninit(&d_gh);
322 if (error == -ENOENT)
323 return NULL;
324 return inode ? inode : ERR_PTR(error);
325 }
326
327 /**
328 * create_ok - OK to create a new on-disk inode here?
329 * @dip: Directory in which dinode is to be created
330 * @name: Name of new dinode
331 * @mode:
332 *
333 * Returns: errno
334 */
335
336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
337 umode_t mode)
338 {
339 int error;
340
341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
342 if (error)
343 return error;
344
345 /* Don't create entries in an unlinked directory */
346 if (!dip->i_inode.i_nlink)
347 return -ENOENT;
348
349 error = gfs2_dir_check(&dip->i_inode, name, NULL);
350 switch (error) {
351 case -ENOENT:
352 error = 0;
353 break;
354 case 0:
355 return -EEXIST;
356 default:
357 return error;
358 }
359
360 if (dip->i_entries == (u32)-1)
361 return -EFBIG;
362 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
363 return -EMLINK;
364
365 return 0;
366 }
367
368 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
369 struct inode *inode)
370 {
371 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
372 (dip->i_inode.i_mode & S_ISUID) &&
373 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
374 if (S_ISDIR(inode->i_mode))
375 inode->i_mode |= S_ISUID;
376 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
377 inode->i_mode &= ~07111;
378 inode->i_uid = dip->i_inode.i_uid;
379 } else
380 inode->i_uid = current_fsuid();
381
382 if (dip->i_inode.i_mode & S_ISGID) {
383 if (S_ISDIR(inode->i_mode))
384 inode->i_mode |= S_ISGID;
385 inode->i_gid = dip->i_inode.i_gid;
386 } else
387 inode->i_gid = current_fsgid();
388 }
389
390 static int alloc_dinode(struct gfs2_inode *ip, u32 flags)
391 {
392 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
393 int error;
394 int dblocks = 1;
395
396 error = gfs2_quota_lock_check(ip);
397 if (error)
398 goto out;
399
400 error = gfs2_inplace_reserve(ip, RES_DINODE, flags);
401 if (error)
402 goto out_quota;
403
404 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0);
405 if (error)
406 goto out_ipreserv;
407
408 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation);
409 ip->i_no_formal_ino = ip->i_generation;
410 ip->i_inode.i_ino = ip->i_no_addr;
411 ip->i_goal = ip->i_no_addr;
412
413 gfs2_trans_end(sdp);
414
415 out_ipreserv:
416 gfs2_inplace_release(ip);
417 out_quota:
418 gfs2_quota_unlock(ip);
419 out:
420 return error;
421 }
422
423 static void gfs2_init_dir(struct buffer_head *dibh,
424 const struct gfs2_inode *parent)
425 {
426 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
427 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
428
429 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
430 dent->de_inum = di->di_num; /* already GFS2 endian */
431 dent->de_type = cpu_to_be16(DT_DIR);
432
433 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
434 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
435 gfs2_inum_out(parent, dent);
436 dent->de_type = cpu_to_be16(DT_DIR);
437
438 }
439
440 /**
441 * init_dinode - Fill in a new dinode structure
442 * @dip: The directory this inode is being created in
443 * @ip: The inode
444 * @symname: The symlink destination (if a symlink)
445 * @bhp: The buffer head (returned to caller)
446 *
447 */
448
449 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
450 const char *symname)
451 {
452 struct gfs2_dinode *di;
453 struct buffer_head *dibh;
454
455 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
456 gfs2_trans_add_meta(ip->i_gl, dibh);
457 di = (struct gfs2_dinode *)dibh->b_data;
458 gfs2_dinode_out(ip, di);
459
460 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
461 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
462 di->__pad1 = 0;
463 di->__pad2 = 0;
464 di->__pad3 = 0;
465 memset(&di->__pad4, 0, sizeof(di->__pad4));
466 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
467 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
468
469 switch(ip->i_inode.i_mode & S_IFMT) {
470 case S_IFDIR:
471 gfs2_init_dir(dibh, dip);
472 break;
473 case S_IFLNK:
474 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
475 break;
476 }
477
478 set_buffer_uptodate(dibh);
479 brelse(dibh);
480 }
481
482 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
483 struct gfs2_inode *ip, int arq)
484 {
485 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
486 int error;
487
488 if (arq) {
489 error = gfs2_quota_lock_check(dip);
490 if (error)
491 goto fail_quota_locks;
492
493 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
494 if (error)
495 goto fail_quota_locks;
496
497 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
498 dip->i_rgd->rd_length +
499 2 * RES_DINODE +
500 RES_STATFS + RES_QUOTA, 0);
501 if (error)
502 goto fail_ipreserv;
503 } else {
504 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
505 if (error)
506 goto fail_quota_locks;
507 }
508
509 error = gfs2_dir_add(&dip->i_inode, name, ip);
510 if (error)
511 goto fail_end_trans;
512
513 fail_end_trans:
514 gfs2_trans_end(sdp);
515 fail_ipreserv:
516 gfs2_inplace_release(dip);
517 fail_quota_locks:
518 gfs2_quota_unlock(dip);
519 return error;
520 }
521
522 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
523 void *fs_info)
524 {
525 const struct xattr *xattr;
526 int err = 0;
527
528 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
529 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
530 xattr->value_len, 0,
531 GFS2_EATYPE_SECURITY);
532 if (err < 0)
533 break;
534 }
535 return err;
536 }
537
538 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
539 const struct qstr *qstr)
540 {
541 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
542 &gfs2_initxattrs, NULL);
543 }
544
545 /**
546 * gfs2_create_inode - Create a new inode
547 * @dir: The parent directory
548 * @dentry: The new dentry
549 * @mode: The permissions on the new inode
550 * @dev: For device nodes, this is the device number
551 * @symname: For symlinks, this is the link destination
552 * @size: The initial size of the inode (ignored for directories)
553 *
554 * Returns: 0 on success, or error code
555 */
556
557 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
558 umode_t mode, dev_t dev, const char *symname,
559 unsigned int size, int excl)
560 {
561 const struct qstr *name = &dentry->d_name;
562 struct gfs2_holder ghs[2];
563 struct inode *inode = NULL;
564 struct gfs2_inode *dip = GFS2_I(dir), *ip;
565 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
566 struct gfs2_glock *io_gl;
567 int error;
568 u32 aflags = 0;
569 int arq;
570
571 if (!name->len || name->len > GFS2_FNAMESIZE)
572 return -ENAMETOOLONG;
573
574 error = gfs2_rs_alloc(dip);
575 if (error)
576 return error;
577
578 error = gfs2_rindex_update(sdp);
579 if (error)
580 return error;
581
582 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
583 if (error)
584 goto fail;
585
586 error = create_ok(dip, name, mode);
587 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
588 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
589 gfs2_glock_dq_uninit(ghs);
590 d_instantiate(dentry, inode);
591 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
592 }
593 if (error)
594 goto fail_gunlock;
595
596 arq = error = gfs2_diradd_alloc_required(dir, name);
597 if (error < 0)
598 goto fail_gunlock;
599
600 inode = new_inode(sdp->sd_vfs);
601 error = -ENOMEM;
602 if (!inode)
603 goto fail_gunlock;
604
605 ip = GFS2_I(inode);
606 error = gfs2_rs_alloc(ip);
607 if (error)
608 goto fail_free_inode;
609
610 inode->i_mode = mode;
611 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
612 inode->i_rdev = dev;
613 inode->i_size = size;
614 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
615 gfs2_set_inode_blocks(inode, 1);
616 munge_mode_uid_gid(dip, inode);
617 ip->i_goal = dip->i_goal;
618 ip->i_diskflags = 0;
619 ip->i_eattr = 0;
620 ip->i_height = 0;
621 ip->i_depth = 0;
622 ip->i_entries = 0;
623
624 switch(mode & S_IFMT) {
625 case S_IFREG:
626 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
627 gfs2_tune_get(sdp, gt_new_files_jdata))
628 ip->i_diskflags |= GFS2_DIF_JDATA;
629 gfs2_set_aops(inode);
630 break;
631 case S_IFDIR:
632 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
633 ip->i_diskflags |= GFS2_DIF_JDATA;
634 ip->i_entries = 2;
635 break;
636 }
637 gfs2_set_inode_flags(inode);
638
639 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
640 (dip->i_diskflags & GFS2_DIF_TOPDIR))
641 aflags |= GFS2_AF_ORLOV;
642
643 error = alloc_dinode(ip, aflags);
644 if (error)
645 goto fail_free_inode;
646
647 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
648 if (error)
649 goto fail_free_inode;
650
651 ip->i_gl->gl_object = ip;
652 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
653 if (error)
654 goto fail_free_inode;
655
656 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
657 if (error)
658 goto fail_gunlock2;
659
660 init_dinode(dip, ip, symname);
661 gfs2_trans_end(sdp);
662
663 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
664 if (error)
665 goto fail_gunlock2;
666
667 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
668 if (error)
669 goto fail_gunlock2;
670
671 ip->i_iopen_gh.gh_gl->gl_object = ip;
672 gfs2_glock_put(io_gl);
673 gfs2_set_iop(inode);
674 insert_inode_hash(inode);
675
676 error = gfs2_acl_create(dip, inode);
677 if (error)
678 goto fail_gunlock3;
679
680 error = gfs2_security_init(dip, ip, name);
681 if (error)
682 goto fail_gunlock3;
683
684 error = link_dinode(dip, name, ip, arq);
685 if (error)
686 goto fail_gunlock3;
687
688 mark_inode_dirty(inode);
689 gfs2_glock_dq_uninit(ghs);
690 gfs2_glock_dq_uninit(ghs + 1);
691 d_instantiate(dentry, inode);
692 return 0;
693
694 fail_gunlock3:
695 gfs2_glock_dq_uninit(ghs + 1);
696 if (ip->i_gl)
697 gfs2_glock_put(ip->i_gl);
698 goto fail_gunlock;
699
700 fail_gunlock2:
701 gfs2_glock_dq_uninit(ghs + 1);
702 fail_free_inode:
703 if (ip->i_gl)
704 gfs2_glock_put(ip->i_gl);
705 gfs2_rs_delete(ip);
706 free_inode_nonrcu(inode);
707 inode = NULL;
708 fail_gunlock:
709 gfs2_glock_dq_uninit(ghs);
710 if (inode && !IS_ERR(inode)) {
711 clear_nlink(inode);
712 mark_inode_dirty(inode);
713 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
714 iput(inode);
715 }
716 fail:
717 return error;
718 }
719
720 /**
721 * gfs2_create - Create a file
722 * @dir: The directory in which to create the file
723 * @dentry: The dentry of the new file
724 * @mode: The mode of the new file
725 *
726 * Returns: errno
727 */
728
729 static int gfs2_create(struct inode *dir, struct dentry *dentry,
730 umode_t mode, bool excl)
731 {
732 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
733 }
734
735 /**
736 * gfs2_lookup - Look up a filename in a directory and return its inode
737 * @dir: The directory inode
738 * @dentry: The dentry of the new inode
739 * @nd: passed from Linux VFS, ignored by us
740 *
741 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
742 *
743 * Returns: errno
744 */
745
746 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
747 unsigned int flags)
748 {
749 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
750 if (inode && !IS_ERR(inode)) {
751 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
752 struct gfs2_holder gh;
753 int error;
754 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
755 if (error) {
756 iput(inode);
757 return ERR_PTR(error);
758 }
759 gfs2_glock_dq_uninit(&gh);
760 }
761 return d_splice_alias(inode, dentry);
762 }
763
764 /**
765 * gfs2_link - Link to a file
766 * @old_dentry: The inode to link
767 * @dir: Add link to this directory
768 * @dentry: The name of the link
769 *
770 * Link the inode in "old_dentry" into the directory "dir" with the
771 * name in "dentry".
772 *
773 * Returns: errno
774 */
775
776 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
777 struct dentry *dentry)
778 {
779 struct gfs2_inode *dip = GFS2_I(dir);
780 struct gfs2_sbd *sdp = GFS2_SB(dir);
781 struct inode *inode = old_dentry->d_inode;
782 struct gfs2_inode *ip = GFS2_I(inode);
783 struct gfs2_holder ghs[2];
784 struct buffer_head *dibh;
785 int alloc_required;
786 int error;
787
788 if (S_ISDIR(inode->i_mode))
789 return -EPERM;
790
791 error = gfs2_rs_alloc(dip);
792 if (error)
793 return error;
794
795 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
796 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
797
798 error = gfs2_glock_nq(ghs); /* parent */
799 if (error)
800 goto out_parent;
801
802 error = gfs2_glock_nq(ghs + 1); /* child */
803 if (error)
804 goto out_child;
805
806 error = -ENOENT;
807 if (inode->i_nlink == 0)
808 goto out_gunlock;
809
810 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
811 if (error)
812 goto out_gunlock;
813
814 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
815 switch (error) {
816 case -ENOENT:
817 break;
818 case 0:
819 error = -EEXIST;
820 default:
821 goto out_gunlock;
822 }
823
824 error = -EINVAL;
825 if (!dip->i_inode.i_nlink)
826 goto out_gunlock;
827 error = -EFBIG;
828 if (dip->i_entries == (u32)-1)
829 goto out_gunlock;
830 error = -EPERM;
831 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
832 goto out_gunlock;
833 error = -EINVAL;
834 if (!ip->i_inode.i_nlink)
835 goto out_gunlock;
836 error = -EMLINK;
837 if (ip->i_inode.i_nlink == (u32)-1)
838 goto out_gunlock;
839
840 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
841 if (error < 0)
842 goto out_gunlock;
843 error = 0;
844
845 if (alloc_required) {
846 error = gfs2_quota_lock_check(dip);
847 if (error)
848 goto out_gunlock;
849
850 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
851 if (error)
852 goto out_gunlock_q;
853
854 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
855 gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
856 2 * RES_DINODE + RES_STATFS +
857 RES_QUOTA, 0);
858 if (error)
859 goto out_ipres;
860 } else {
861 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
862 if (error)
863 goto out_ipres;
864 }
865
866 error = gfs2_meta_inode_buffer(ip, &dibh);
867 if (error)
868 goto out_end_trans;
869
870 error = gfs2_dir_add(dir, &dentry->d_name, ip);
871 if (error)
872 goto out_brelse;
873
874 gfs2_trans_add_meta(ip->i_gl, dibh);
875 inc_nlink(&ip->i_inode);
876 ip->i_inode.i_ctime = CURRENT_TIME;
877 ihold(inode);
878 d_instantiate(dentry, inode);
879 mark_inode_dirty(inode);
880
881 out_brelse:
882 brelse(dibh);
883 out_end_trans:
884 gfs2_trans_end(sdp);
885 out_ipres:
886 if (alloc_required)
887 gfs2_inplace_release(dip);
888 out_gunlock_q:
889 if (alloc_required)
890 gfs2_quota_unlock(dip);
891 out_gunlock:
892 gfs2_glock_dq(ghs + 1);
893 out_child:
894 gfs2_glock_dq(ghs);
895 out_parent:
896 gfs2_holder_uninit(ghs);
897 gfs2_holder_uninit(ghs + 1);
898 return error;
899 }
900
901 /*
902 * gfs2_unlink_ok - check to see that a inode is still in a directory
903 * @dip: the directory
904 * @name: the name of the file
905 * @ip: the inode
906 *
907 * Assumes that the lock on (at least) @dip is held.
908 *
909 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
910 */
911
912 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
913 const struct gfs2_inode *ip)
914 {
915 int error;
916
917 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
918 return -EPERM;
919
920 if ((dip->i_inode.i_mode & S_ISVTX) &&
921 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
922 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
923 return -EPERM;
924
925 if (IS_APPEND(&dip->i_inode))
926 return -EPERM;
927
928 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
929 if (error)
930 return error;
931
932 error = gfs2_dir_check(&dip->i_inode, name, ip);
933 if (error)
934 return error;
935
936 return 0;
937 }
938
939 /**
940 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
941 * @dip: The parent directory
942 * @name: The name of the entry in the parent directory
943 * @inode: The inode to be removed
944 *
945 * Called with all the locks and in a transaction. This will only be
946 * called for a directory after it has been checked to ensure it is empty.
947 *
948 * Returns: 0 on success, or an error
949 */
950
951 static int gfs2_unlink_inode(struct gfs2_inode *dip,
952 const struct dentry *dentry)
953 {
954 struct inode *inode = dentry->d_inode;
955 struct gfs2_inode *ip = GFS2_I(inode);
956 int error;
957
958 error = gfs2_dir_del(dip, dentry);
959 if (error)
960 return error;
961
962 ip->i_entries = 0;
963 inode->i_ctime = CURRENT_TIME;
964 if (S_ISDIR(inode->i_mode))
965 clear_nlink(inode);
966 else
967 drop_nlink(inode);
968 mark_inode_dirty(inode);
969 if (inode->i_nlink == 0)
970 gfs2_unlink_di(inode);
971 return 0;
972 }
973
974
975 /**
976 * gfs2_unlink - Unlink an inode (this does rmdir as well)
977 * @dir: The inode of the directory containing the inode to unlink
978 * @dentry: The file itself
979 *
980 * This routine uses the type of the inode as a flag to figure out
981 * whether this is an unlink or an rmdir.
982 *
983 * Returns: errno
984 */
985
986 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
987 {
988 struct gfs2_inode *dip = GFS2_I(dir);
989 struct gfs2_sbd *sdp = GFS2_SB(dir);
990 struct inode *inode = dentry->d_inode;
991 struct gfs2_inode *ip = GFS2_I(inode);
992 struct gfs2_holder ghs[3];
993 struct gfs2_rgrpd *rgd;
994 int error;
995
996 error = gfs2_rindex_update(sdp);
997 if (error)
998 return error;
999
1000 error = -EROFS;
1001
1002 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1003 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1004
1005 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1006 if (!rgd)
1007 goto out_inodes;
1008
1009 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1010
1011
1012 error = gfs2_glock_nq(ghs); /* parent */
1013 if (error)
1014 goto out_parent;
1015
1016 error = gfs2_glock_nq(ghs + 1); /* child */
1017 if (error)
1018 goto out_child;
1019
1020 error = -ENOENT;
1021 if (inode->i_nlink == 0)
1022 goto out_rgrp;
1023
1024 if (S_ISDIR(inode->i_mode)) {
1025 error = -ENOTEMPTY;
1026 if (ip->i_entries > 2 || inode->i_nlink > 2)
1027 goto out_rgrp;
1028 }
1029
1030 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1031 if (error)
1032 goto out_rgrp;
1033
1034 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1035 if (error)
1036 goto out_gunlock;
1037
1038 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1039 if (error)
1040 goto out_end_trans;
1041
1042 error = gfs2_unlink_inode(dip, dentry);
1043
1044 out_end_trans:
1045 gfs2_trans_end(sdp);
1046 out_gunlock:
1047 gfs2_glock_dq(ghs + 2);
1048 out_rgrp:
1049 gfs2_glock_dq(ghs + 1);
1050 out_child:
1051 gfs2_glock_dq(ghs);
1052 out_parent:
1053 gfs2_holder_uninit(ghs + 2);
1054 out_inodes:
1055 gfs2_holder_uninit(ghs + 1);
1056 gfs2_holder_uninit(ghs);
1057 return error;
1058 }
1059
1060 /**
1061 * gfs2_symlink - Create a symlink
1062 * @dir: The directory to create the symlink in
1063 * @dentry: The dentry to put the symlink in
1064 * @symname: The thing which the link points to
1065 *
1066 * Returns: errno
1067 */
1068
1069 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1070 const char *symname)
1071 {
1072 struct gfs2_sbd *sdp = GFS2_SB(dir);
1073 unsigned int size;
1074
1075 size = strlen(symname);
1076 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1077 return -ENAMETOOLONG;
1078
1079 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1080 }
1081
1082 /**
1083 * gfs2_mkdir - Make a directory
1084 * @dir: The parent directory of the new one
1085 * @dentry: The dentry of the new directory
1086 * @mode: The mode of the new directory
1087 *
1088 * Returns: errno
1089 */
1090
1091 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1092 {
1093 struct gfs2_sbd *sdp = GFS2_SB(dir);
1094 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1095 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, dsize, 0);
1096 }
1097
1098 /**
1099 * gfs2_mknod - Make a special file
1100 * @dir: The directory in which the special file will reside
1101 * @dentry: The dentry of the special file
1102 * @mode: The mode of the special file
1103 * @dev: The device specification of the special file
1104 *
1105 */
1106
1107 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1108 dev_t dev)
1109 {
1110 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1111 }
1112
1113 /*
1114 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1115 * @this: move this
1116 * @to: to here
1117 *
1118 * Follow @to back to the root and make sure we don't encounter @this
1119 * Assumes we already hold the rename lock.
1120 *
1121 * Returns: errno
1122 */
1123
1124 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1125 {
1126 struct inode *dir = &to->i_inode;
1127 struct super_block *sb = dir->i_sb;
1128 struct inode *tmp;
1129 int error = 0;
1130
1131 igrab(dir);
1132
1133 for (;;) {
1134 if (dir == &this->i_inode) {
1135 error = -EINVAL;
1136 break;
1137 }
1138 if (dir == sb->s_root->d_inode) {
1139 error = 0;
1140 break;
1141 }
1142
1143 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1144 if (IS_ERR(tmp)) {
1145 error = PTR_ERR(tmp);
1146 break;
1147 }
1148
1149 iput(dir);
1150 dir = tmp;
1151 }
1152
1153 iput(dir);
1154
1155 return error;
1156 }
1157
1158 /**
1159 * gfs2_rename - Rename a file
1160 * @odir: Parent directory of old file name
1161 * @odentry: The old dentry of the file
1162 * @ndir: Parent directory of new file name
1163 * @ndentry: The new dentry of the file
1164 *
1165 * Returns: errno
1166 */
1167
1168 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1169 struct inode *ndir, struct dentry *ndentry)
1170 {
1171 struct gfs2_inode *odip = GFS2_I(odir);
1172 struct gfs2_inode *ndip = GFS2_I(ndir);
1173 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1174 struct gfs2_inode *nip = NULL;
1175 struct gfs2_sbd *sdp = GFS2_SB(odir);
1176 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1177 struct gfs2_rgrpd *nrgd;
1178 unsigned int num_gh;
1179 int dir_rename = 0;
1180 int alloc_required = 0;
1181 unsigned int x;
1182 int error;
1183
1184 if (ndentry->d_inode) {
1185 nip = GFS2_I(ndentry->d_inode);
1186 if (ip == nip)
1187 return 0;
1188 }
1189
1190 error = gfs2_rindex_update(sdp);
1191 if (error)
1192 return error;
1193
1194 error = gfs2_rs_alloc(ndip);
1195 if (error)
1196 return error;
1197
1198 if (odip != ndip) {
1199 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1200 0, &r_gh);
1201 if (error)
1202 goto out;
1203
1204 if (S_ISDIR(ip->i_inode.i_mode)) {
1205 dir_rename = 1;
1206 /* don't move a dirctory into it's subdir */
1207 error = gfs2_ok_to_move(ip, ndip);
1208 if (error)
1209 goto out_gunlock_r;
1210 }
1211 }
1212
1213 num_gh = 1;
1214 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1215 if (odip != ndip) {
1216 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1217 num_gh++;
1218 }
1219 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1220 num_gh++;
1221
1222 if (nip) {
1223 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1224 num_gh++;
1225 /* grab the resource lock for unlink flag twiddling
1226 * this is the case of the target file already existing
1227 * so we unlink before doing the rename
1228 */
1229 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1230 if (nrgd)
1231 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1232 }
1233
1234 for (x = 0; x < num_gh; x++) {
1235 error = gfs2_glock_nq(ghs + x);
1236 if (error)
1237 goto out_gunlock;
1238 }
1239
1240 error = -ENOENT;
1241 if (ip->i_inode.i_nlink == 0)
1242 goto out_gunlock;
1243
1244 /* Check out the old directory */
1245
1246 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1247 if (error)
1248 goto out_gunlock;
1249
1250 /* Check out the new directory */
1251
1252 if (nip) {
1253 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1254 if (error)
1255 goto out_gunlock;
1256
1257 if (nip->i_inode.i_nlink == 0) {
1258 error = -EAGAIN;
1259 goto out_gunlock;
1260 }
1261
1262 if (S_ISDIR(nip->i_inode.i_mode)) {
1263 if (nip->i_entries < 2) {
1264 gfs2_consist_inode(nip);
1265 error = -EIO;
1266 goto out_gunlock;
1267 }
1268 if (nip->i_entries > 2) {
1269 error = -ENOTEMPTY;
1270 goto out_gunlock;
1271 }
1272 }
1273 } else {
1274 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1275 if (error)
1276 goto out_gunlock;
1277
1278 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1279 switch (error) {
1280 case -ENOENT:
1281 error = 0;
1282 break;
1283 case 0:
1284 error = -EEXIST;
1285 default:
1286 goto out_gunlock;
1287 };
1288
1289 if (odip != ndip) {
1290 if (!ndip->i_inode.i_nlink) {
1291 error = -ENOENT;
1292 goto out_gunlock;
1293 }
1294 if (ndip->i_entries == (u32)-1) {
1295 error = -EFBIG;
1296 goto out_gunlock;
1297 }
1298 if (S_ISDIR(ip->i_inode.i_mode) &&
1299 ndip->i_inode.i_nlink == (u32)-1) {
1300 error = -EMLINK;
1301 goto out_gunlock;
1302 }
1303 }
1304 }
1305
1306 /* Check out the dir to be renamed */
1307
1308 if (dir_rename) {
1309 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1310 if (error)
1311 goto out_gunlock;
1312 }
1313
1314 if (nip == NULL)
1315 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1316 error = alloc_required;
1317 if (error < 0)
1318 goto out_gunlock;
1319
1320 if (alloc_required) {
1321 error = gfs2_quota_lock_check(ndip);
1322 if (error)
1323 goto out_gunlock;
1324
1325 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1326 if (error)
1327 goto out_gunlock_q;
1328
1329 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1330 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1331 4 * RES_DINODE + 4 * RES_LEAF +
1332 RES_STATFS + RES_QUOTA + 4, 0);
1333 if (error)
1334 goto out_ipreserv;
1335 } else {
1336 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1337 5 * RES_LEAF + 4, 0);
1338 if (error)
1339 goto out_gunlock;
1340 }
1341
1342 /* Remove the target file, if it exists */
1343
1344 if (nip)
1345 error = gfs2_unlink_inode(ndip, ndentry);
1346
1347 if (dir_rename) {
1348 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1349 if (error)
1350 goto out_end_trans;
1351 } else {
1352 struct buffer_head *dibh;
1353 error = gfs2_meta_inode_buffer(ip, &dibh);
1354 if (error)
1355 goto out_end_trans;
1356 ip->i_inode.i_ctime = CURRENT_TIME;
1357 gfs2_trans_add_meta(ip->i_gl, dibh);
1358 gfs2_dinode_out(ip, dibh->b_data);
1359 brelse(dibh);
1360 }
1361
1362 error = gfs2_dir_del(odip, odentry);
1363 if (error)
1364 goto out_end_trans;
1365
1366 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1367 if (error)
1368 goto out_end_trans;
1369
1370 out_end_trans:
1371 gfs2_trans_end(sdp);
1372 out_ipreserv:
1373 if (alloc_required)
1374 gfs2_inplace_release(ndip);
1375 out_gunlock_q:
1376 if (alloc_required)
1377 gfs2_quota_unlock(ndip);
1378 out_gunlock:
1379 while (x--) {
1380 gfs2_glock_dq(ghs + x);
1381 gfs2_holder_uninit(ghs + x);
1382 }
1383 out_gunlock_r:
1384 if (r_gh.gh_gl)
1385 gfs2_glock_dq_uninit(&r_gh);
1386 out:
1387 return error;
1388 }
1389
1390 /**
1391 * gfs2_follow_link - Follow a symbolic link
1392 * @dentry: The dentry of the link
1393 * @nd: Data that we pass to vfs_follow_link()
1394 *
1395 * This can handle symlinks of any size.
1396 *
1397 * Returns: 0 on success or error code
1398 */
1399
1400 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1401 {
1402 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1403 struct gfs2_holder i_gh;
1404 struct buffer_head *dibh;
1405 unsigned int size;
1406 char *buf;
1407 int error;
1408
1409 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1410 error = gfs2_glock_nq(&i_gh);
1411 if (error) {
1412 gfs2_holder_uninit(&i_gh);
1413 nd_set_link(nd, ERR_PTR(error));
1414 return NULL;
1415 }
1416
1417 size = (unsigned int)i_size_read(&ip->i_inode);
1418 if (size == 0) {
1419 gfs2_consist_inode(ip);
1420 buf = ERR_PTR(-EIO);
1421 goto out;
1422 }
1423
1424 error = gfs2_meta_inode_buffer(ip, &dibh);
1425 if (error) {
1426 buf = ERR_PTR(error);
1427 goto out;
1428 }
1429
1430 buf = kzalloc(size + 1, GFP_NOFS);
1431 if (!buf)
1432 buf = ERR_PTR(-ENOMEM);
1433 else
1434 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1435 brelse(dibh);
1436 out:
1437 gfs2_glock_dq_uninit(&i_gh);
1438 nd_set_link(nd, buf);
1439 return NULL;
1440 }
1441
1442 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1443 {
1444 char *s = nd_get_link(nd);
1445 if (!IS_ERR(s))
1446 kfree(s);
1447 }
1448
1449 /**
1450 * gfs2_permission -
1451 * @inode: The inode
1452 * @mask: The mask to be tested
1453 * @flags: Indicates whether this is an RCU path walk or not
1454 *
1455 * This may be called from the VFS directly, or from within GFS2 with the
1456 * inode locked, so we look to see if the glock is already locked and only
1457 * lock the glock if its not already been done.
1458 *
1459 * Returns: errno
1460 */
1461
1462 int gfs2_permission(struct inode *inode, int mask)
1463 {
1464 struct gfs2_inode *ip;
1465 struct gfs2_holder i_gh;
1466 int error;
1467 int unlock = 0;
1468
1469
1470 ip = GFS2_I(inode);
1471 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1472 if (mask & MAY_NOT_BLOCK)
1473 return -ECHILD;
1474 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1475 if (error)
1476 return error;
1477 unlock = 1;
1478 }
1479
1480 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1481 error = -EACCES;
1482 else
1483 error = generic_permission(inode, mask);
1484 if (unlock)
1485 gfs2_glock_dq_uninit(&i_gh);
1486
1487 return error;
1488 }
1489
1490 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1491 {
1492 setattr_copy(inode, attr);
1493 mark_inode_dirty(inode);
1494 return 0;
1495 }
1496
1497 /**
1498 * gfs2_setattr_simple -
1499 * @ip:
1500 * @attr:
1501 *
1502 * Returns: errno
1503 */
1504
1505 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1506 {
1507 int error;
1508
1509 if (current->journal_info)
1510 return __gfs2_setattr_simple(inode, attr);
1511
1512 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1513 if (error)
1514 return error;
1515
1516 error = __gfs2_setattr_simple(inode, attr);
1517 gfs2_trans_end(GFS2_SB(inode));
1518 return error;
1519 }
1520
1521 static int setattr_chown(struct inode *inode, struct iattr *attr)
1522 {
1523 struct gfs2_inode *ip = GFS2_I(inode);
1524 struct gfs2_sbd *sdp = GFS2_SB(inode);
1525 kuid_t ouid, nuid;
1526 kgid_t ogid, ngid;
1527 int error;
1528
1529 ouid = inode->i_uid;
1530 ogid = inode->i_gid;
1531 nuid = attr->ia_uid;
1532 ngid = attr->ia_gid;
1533
1534 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1535 ouid = nuid = NO_UID_QUOTA_CHANGE;
1536 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1537 ogid = ngid = NO_GID_QUOTA_CHANGE;
1538
1539 error = get_write_access(inode);
1540 if (error)
1541 return error;
1542
1543 error = gfs2_rs_alloc(ip);
1544 if (error)
1545 goto out;
1546
1547 error = gfs2_rindex_update(sdp);
1548 if (error)
1549 goto out;
1550
1551 error = gfs2_quota_lock(ip, nuid, ngid);
1552 if (error)
1553 goto out;
1554
1555 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1556 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1557 error = gfs2_quota_check(ip, nuid, ngid);
1558 if (error)
1559 goto out_gunlock_q;
1560 }
1561
1562 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1563 if (error)
1564 goto out_gunlock_q;
1565
1566 error = gfs2_setattr_simple(inode, attr);
1567 if (error)
1568 goto out_end_trans;
1569
1570 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1571 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1572 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1573 gfs2_quota_change(ip, -blocks, ouid, ogid);
1574 gfs2_quota_change(ip, blocks, nuid, ngid);
1575 }
1576
1577 out_end_trans:
1578 gfs2_trans_end(sdp);
1579 out_gunlock_q:
1580 gfs2_quota_unlock(ip);
1581 out:
1582 put_write_access(inode);
1583 return error;
1584 }
1585
1586 /**
1587 * gfs2_setattr - Change attributes on an inode
1588 * @dentry: The dentry which is changing
1589 * @attr: The structure describing the change
1590 *
1591 * The VFS layer wants to change one or more of an inodes attributes. Write
1592 * that change out to disk.
1593 *
1594 * Returns: errno
1595 */
1596
1597 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1598 {
1599 struct inode *inode = dentry->d_inode;
1600 struct gfs2_inode *ip = GFS2_I(inode);
1601 struct gfs2_holder i_gh;
1602 int error;
1603
1604 error = gfs2_rs_alloc(ip);
1605 if (error)
1606 return error;
1607
1608 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1609 if (error)
1610 return error;
1611
1612 error = -EPERM;
1613 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1614 goto out;
1615
1616 error = inode_change_ok(inode, attr);
1617 if (error)
1618 goto out;
1619
1620 if (attr->ia_valid & ATTR_SIZE)
1621 error = gfs2_setattr_size(inode, attr->ia_size);
1622 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1623 error = setattr_chown(inode, attr);
1624 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1625 error = gfs2_acl_chmod(ip, attr);
1626 else
1627 error = gfs2_setattr_simple(inode, attr);
1628
1629 out:
1630 if (!error)
1631 mark_inode_dirty(inode);
1632 gfs2_glock_dq_uninit(&i_gh);
1633 return error;
1634 }
1635
1636 /**
1637 * gfs2_getattr - Read out an inode's attributes
1638 * @mnt: The vfsmount the inode is being accessed from
1639 * @dentry: The dentry to stat
1640 * @stat: The inode's stats
1641 *
1642 * This may be called from the VFS directly, or from within GFS2 with the
1643 * inode locked, so we look to see if the glock is already locked and only
1644 * lock the glock if its not already been done. Note that its the NFS
1645 * readdirplus operation which causes this to be called (from filldir)
1646 * with the glock already held.
1647 *
1648 * Returns: errno
1649 */
1650
1651 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1652 struct kstat *stat)
1653 {
1654 struct inode *inode = dentry->d_inode;
1655 struct gfs2_inode *ip = GFS2_I(inode);
1656 struct gfs2_holder gh;
1657 int error;
1658 int unlock = 0;
1659
1660 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1662 if (error)
1663 return error;
1664 unlock = 1;
1665 }
1666
1667 generic_fillattr(inode, stat);
1668 if (unlock)
1669 gfs2_glock_dq_uninit(&gh);
1670
1671 return 0;
1672 }
1673
1674 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1675 const void *data, size_t size, int flags)
1676 {
1677 struct inode *inode = dentry->d_inode;
1678 struct gfs2_inode *ip = GFS2_I(inode);
1679 struct gfs2_holder gh;
1680 int ret;
1681
1682 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1683 ret = gfs2_glock_nq(&gh);
1684 if (ret == 0) {
1685 ret = gfs2_rs_alloc(ip);
1686 if (ret == 0)
1687 ret = generic_setxattr(dentry, name, data, size, flags);
1688 gfs2_glock_dq(&gh);
1689 }
1690 gfs2_holder_uninit(&gh);
1691 return ret;
1692 }
1693
1694 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1695 void *data, size_t size)
1696 {
1697 struct inode *inode = dentry->d_inode;
1698 struct gfs2_inode *ip = GFS2_I(inode);
1699 struct gfs2_holder gh;
1700 int ret;
1701
1702 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1703 ret = gfs2_glock_nq(&gh);
1704 if (ret == 0) {
1705 ret = generic_getxattr(dentry, name, data, size);
1706 gfs2_glock_dq(&gh);
1707 }
1708 gfs2_holder_uninit(&gh);
1709 return ret;
1710 }
1711
1712 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1713 {
1714 struct inode *inode = dentry->d_inode;
1715 struct gfs2_inode *ip = GFS2_I(inode);
1716 struct gfs2_holder gh;
1717 int ret;
1718
1719 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1720 ret = gfs2_glock_nq(&gh);
1721 if (ret == 0) {
1722 ret = gfs2_rs_alloc(ip);
1723 if (ret == 0)
1724 ret = generic_removexattr(dentry, name);
1725 gfs2_glock_dq(&gh);
1726 }
1727 gfs2_holder_uninit(&gh);
1728 return ret;
1729 }
1730
1731 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1732 u64 start, u64 len)
1733 {
1734 struct gfs2_inode *ip = GFS2_I(inode);
1735 struct gfs2_holder gh;
1736 int ret;
1737
1738 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1739 if (ret)
1740 return ret;
1741
1742 mutex_lock(&inode->i_mutex);
1743
1744 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1745 if (ret)
1746 goto out;
1747
1748 if (gfs2_is_stuffed(ip)) {
1749 u64 phys = ip->i_no_addr << inode->i_blkbits;
1750 u64 size = i_size_read(inode);
1751 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1752 FIEMAP_EXTENT_DATA_INLINE;
1753 phys += sizeof(struct gfs2_dinode);
1754 phys += start;
1755 if (start + len > size)
1756 len = size - start;
1757 if (start < size)
1758 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1759 len, flags);
1760 if (ret == 1)
1761 ret = 0;
1762 } else {
1763 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1764 gfs2_block_map);
1765 }
1766
1767 gfs2_glock_dq_uninit(&gh);
1768 out:
1769 mutex_unlock(&inode->i_mutex);
1770 return ret;
1771 }
1772
1773 const struct inode_operations gfs2_file_iops = {
1774 .permission = gfs2_permission,
1775 .setattr = gfs2_setattr,
1776 .getattr = gfs2_getattr,
1777 .setxattr = gfs2_setxattr,
1778 .getxattr = gfs2_getxattr,
1779 .listxattr = gfs2_listxattr,
1780 .removexattr = gfs2_removexattr,
1781 .fiemap = gfs2_fiemap,
1782 .get_acl = gfs2_get_acl,
1783 };
1784
1785 const struct inode_operations gfs2_dir_iops = {
1786 .create = gfs2_create,
1787 .lookup = gfs2_lookup,
1788 .link = gfs2_link,
1789 .unlink = gfs2_unlink,
1790 .symlink = gfs2_symlink,
1791 .mkdir = gfs2_mkdir,
1792 .rmdir = gfs2_unlink,
1793 .mknod = gfs2_mknod,
1794 .rename = gfs2_rename,
1795 .permission = gfs2_permission,
1796 .setattr = gfs2_setattr,
1797 .getattr = gfs2_getattr,
1798 .setxattr = gfs2_setxattr,
1799 .getxattr = gfs2_getxattr,
1800 .listxattr = gfs2_listxattr,
1801 .removexattr = gfs2_removexattr,
1802 .fiemap = gfs2_fiemap,
1803 .get_acl = gfs2_get_acl,
1804 };
1805
1806 const struct inode_operations gfs2_symlink_iops = {
1807 .readlink = generic_readlink,
1808 .follow_link = gfs2_follow_link,
1809 .put_link = gfs2_put_link,
1810 .permission = gfs2_permission,
1811 .setattr = gfs2_setattr,
1812 .getattr = gfs2_getattr,
1813 .setxattr = gfs2_setxattr,
1814 .getxattr = gfs2_getxattr,
1815 .listxattr = gfs2_listxattr,
1816 .removexattr = gfs2_removexattr,
1817 .fiemap = gfs2_fiemap,
1818 .get_acl = gfs2_get_acl,
1819 };
1820
kernel source for telekom puls (alcatel/mediatek)