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/cred.h>
17 #include <linux/xattr.h>
18 #include <linux/posix_acl.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/crc32.h>
21 #include <linux/fiemap.h>
22 #include <linux/security.h>
23 #include <linux/uaccess.h>
24
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "acl.h"
28 #include "bmap.h"
29 #include "dir.h"
30 #include "xattr.h"
31 #include "glock.h"
32 #include "inode.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "rgrp.h"
36 #include "trans.h"
37 #include "util.h"
38 #include "super.h"
39 #include "glops.h"
40
iget_test(struct inode * inode,void * opaque)41 static int iget_test(struct inode *inode, void *opaque)
42 {
43 u64 no_addr = *(u64 *)opaque;
44
45 return GFS2_I(inode)->i_no_addr == no_addr;
46 }
47
iget_set(struct inode * inode,void * opaque)48 static int iget_set(struct inode *inode, void *opaque)
49 {
50 u64 no_addr = *(u64 *)opaque;
51
52 GFS2_I(inode)->i_no_addr = no_addr;
53 inode->i_ino = no_addr;
54 return 0;
55 }
56
gfs2_iget(struct super_block * sb,u64 no_addr)57 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
58 {
59 struct inode *inode;
60
61 repeat:
62 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
63 if (!inode)
64 return inode;
65 if (is_bad_inode(inode)) {
66 iput(inode);
67 goto repeat;
68 }
69 return inode;
70 }
71
72 /**
73 * gfs2_set_iop - Sets inode operations
74 * @inode: The inode with correct i_mode filled in
75 *
76 * GFS2 lookup code fills in vfs inode contents based on info obtained
77 * from directory entry inside gfs2_inode_lookup().
78 */
79
gfs2_set_iop(struct inode * inode)80 static void gfs2_set_iop(struct inode *inode)
81 {
82 struct gfs2_sbd *sdp = GFS2_SB(inode);
83 umode_t mode = inode->i_mode;
84
85 if (S_ISREG(mode)) {
86 inode->i_op = &gfs2_file_iops;
87 if (gfs2_localflocks(sdp))
88 inode->i_fop = &gfs2_file_fops_nolock;
89 else
90 inode->i_fop = &gfs2_file_fops;
91 } else if (S_ISDIR(mode)) {
92 inode->i_op = &gfs2_dir_iops;
93 if (gfs2_localflocks(sdp))
94 inode->i_fop = &gfs2_dir_fops_nolock;
95 else
96 inode->i_fop = &gfs2_dir_fops;
97 } else if (S_ISLNK(mode)) {
98 inode->i_op = &gfs2_symlink_iops;
99 } else {
100 inode->i_op = &gfs2_file_iops;
101 init_special_inode(inode, inode->i_mode, inode->i_rdev);
102 }
103 }
104
105 /**
106 * gfs2_inode_lookup - Lookup an inode
107 * @sb: The super block
108 * @type: The type of the inode
109 * @no_addr: The inode number
110 * @no_formal_ino: The inode generation number
111 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
112 * GFS2_BLKST_FREE to indicate not to verify)
113 *
114 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
115 *
116 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
117 * placeholder because it doesn't otherwise make sense), the on-disk block type
118 * is verified to be @blktype.
119 *
120 * Returns: A VFS inode, or an error
121 */
122
gfs2_inode_lookup(struct super_block * sb,unsigned int type,u64 no_addr,u64 no_formal_ino,unsigned int blktype)123 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
124 u64 no_addr, u64 no_formal_ino,
125 unsigned int blktype)
126 {
127 struct inode *inode;
128 struct gfs2_inode *ip;
129 struct gfs2_glock *io_gl = NULL;
130 struct gfs2_holder i_gh;
131 int error;
132
133 gfs2_holder_mark_uninitialized(&i_gh);
134 inode = gfs2_iget(sb, no_addr);
135 if (!inode)
136 return ERR_PTR(-ENOMEM);
137
138 ip = GFS2_I(inode);
139
140 if (inode->i_state & I_NEW) {
141 struct gfs2_sbd *sdp = GFS2_SB(inode);
142 ip->i_no_formal_ino = no_formal_ino;
143
144 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
145 if (unlikely(error))
146 goto fail;
147 flush_delayed_work(&ip->i_gl->gl_work);
148
149 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
150 if (unlikely(error))
151 goto fail_put;
152
153 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
154 /*
155 * The GL_SKIP flag indicates to skip reading the inode
156 * block. We read the inode with gfs2_inode_refresh
157 * after possibly checking the block type.
158 */
159 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
160 GL_SKIP, &i_gh);
161 if (error)
162 goto fail_put;
163
164 if (blktype != GFS2_BLKST_FREE) {
165 error = gfs2_check_blk_type(sdp, no_addr,
166 blktype);
167 if (error)
168 goto fail_put;
169 }
170 }
171
172 glock_set_object(ip->i_gl, ip);
173 set_bit(GIF_INVALID, &ip->i_flags);
174 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
175 if (unlikely(error))
176 goto fail_put;
177 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
178 gfs2_glock_put(io_gl);
179 io_gl = NULL;
180
181 if (type == DT_UNKNOWN) {
182 /* Inode glock must be locked already */
183 error = gfs2_inode_refresh(GFS2_I(inode));
184 if (error)
185 goto fail_refresh;
186 } else {
187 inode->i_mode = DT2IF(type);
188 }
189
190 gfs2_set_iop(inode);
191
192 inode->i_atime.tv_sec = 0;
193 inode->i_atime.tv_nsec = 0;
194
195 unlock_new_inode(inode);
196 }
197
198 if (gfs2_holder_initialized(&i_gh))
199 gfs2_glock_dq_uninit(&i_gh);
200 return inode;
201
202 fail_refresh:
203 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
204 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
205 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
206 fail_put:
207 if (io_gl)
208 gfs2_glock_put(io_gl);
209 glock_clear_object(ip->i_gl, ip);
210 if (gfs2_holder_initialized(&i_gh))
211 gfs2_glock_dq_uninit(&i_gh);
212 fail:
213 iget_failed(inode);
214 return ERR_PTR(error);
215 }
216
gfs2_lookup_by_inum(struct gfs2_sbd * sdp,u64 no_addr,u64 * no_formal_ino,unsigned int blktype)217 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
218 u64 *no_formal_ino, unsigned int blktype)
219 {
220 struct super_block *sb = sdp->sd_vfs;
221 struct inode *inode;
222 int error;
223
224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
225 if (IS_ERR(inode))
226 return inode;
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 return inode;
239
240 fail_iput:
241 iput(inode);
242 return ERR_PTR(error);
243 }
244
245
gfs2_lookup_simple(struct inode * dip,const char * name)246 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
247 {
248 struct qstr qstr;
249 struct inode *inode;
250 gfs2_str2qstr(&qstr, name);
251 inode = gfs2_lookupi(dip, &qstr, 1);
252 /* gfs2_lookupi has inconsistent callers: vfs
253 * related routines expect NULL for no entry found,
254 * gfs2_lookup_simple callers expect ENOENT
255 * and do not check for NULL.
256 */
257 if (inode == NULL)
258 return ERR_PTR(-ENOENT);
259 else
260 return inode;
261 }
262
263
264 /**
265 * gfs2_lookupi - Look up a filename in a directory and return its inode
266 * @d_gh: An initialized holder for the directory glock
267 * @name: The name of the inode to look for
268 * @is_root: If 1, ignore the caller's permissions
269 * @i_gh: An uninitialized holder for the new inode glock
270 *
271 * This can be called via the VFS filldir function when NFS is doing
272 * a readdirplus and the inode which its intending to stat isn't
273 * already in cache. In this case we must not take the directory glock
274 * again, since the readdir call will have already taken that lock.
275 *
276 * Returns: errno
277 */
278
gfs2_lookupi(struct inode * dir,const struct qstr * name,int is_root)279 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
280 int is_root)
281 {
282 struct super_block *sb = dir->i_sb;
283 struct gfs2_inode *dip = GFS2_I(dir);
284 struct gfs2_holder d_gh;
285 int error = 0;
286 struct inode *inode = NULL;
287
288 gfs2_holder_mark_uninitialized(&d_gh);
289 if (!name->len || name->len > GFS2_FNAMESIZE)
290 return ERR_PTR(-ENAMETOOLONG);
291
292 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
293 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
294 dir == d_inode(sb->s_root))) {
295 igrab(dir);
296 return dir;
297 }
298
299 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
300 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
301 if (error)
302 return ERR_PTR(error);
303 }
304
305 if (!is_root) {
306 error = gfs2_permission(dir, MAY_EXEC);
307 if (error)
308 goto out;
309 }
310
311 inode = gfs2_dir_search(dir, name, false);
312 if (IS_ERR(inode))
313 error = PTR_ERR(inode);
314 out:
315 if (gfs2_holder_initialized(&d_gh))
316 gfs2_glock_dq_uninit(&d_gh);
317 if (error == -ENOENT)
318 return NULL;
319 return inode ? inode : ERR_PTR(error);
320 }
321
322 /**
323 * create_ok - OK to create a new on-disk inode here?
324 * @dip: Directory in which dinode is to be created
325 * @name: Name of new dinode
326 * @mode:
327 *
328 * Returns: errno
329 */
330
create_ok(struct gfs2_inode * dip,const struct qstr * name,umode_t mode)331 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
332 umode_t mode)
333 {
334 int error;
335
336 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
337 if (error)
338 return error;
339
340 /* Don't create entries in an unlinked directory */
341 if (!dip->i_inode.i_nlink)
342 return -ENOENT;
343
344 if (dip->i_entries == (u32)-1)
345 return -EFBIG;
346 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
347 return -EMLINK;
348
349 return 0;
350 }
351
munge_mode_uid_gid(const struct gfs2_inode * dip,struct inode * inode)352 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
353 struct inode *inode)
354 {
355 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
356 (dip->i_inode.i_mode & S_ISUID) &&
357 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
358 if (S_ISDIR(inode->i_mode))
359 inode->i_mode |= S_ISUID;
360 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
361 inode->i_mode &= ~07111;
362 inode->i_uid = dip->i_inode.i_uid;
363 } else
364 inode->i_uid = current_fsuid();
365
366 if (dip->i_inode.i_mode & S_ISGID) {
367 if (S_ISDIR(inode->i_mode))
368 inode->i_mode |= S_ISGID;
369 inode->i_gid = dip->i_inode.i_gid;
370 } else
371 inode->i_gid = current_fsgid();
372 }
373
alloc_dinode(struct gfs2_inode * ip,u32 flags,unsigned * dblocks)374 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
375 {
376 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
377 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
378 int error;
379
380 error = gfs2_quota_lock_check(ip, &ap);
381 if (error)
382 goto out;
383
384 error = gfs2_inplace_reserve(ip, &ap);
385 if (error)
386 goto out_quota;
387
388 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
389 if (error)
390 goto out_ipreserv;
391
392 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
393 ip->i_no_formal_ino = ip->i_generation;
394 ip->i_inode.i_ino = ip->i_no_addr;
395 ip->i_goal = ip->i_no_addr;
396
397 gfs2_trans_end(sdp);
398
399 out_ipreserv:
400 gfs2_inplace_release(ip);
401 out_quota:
402 gfs2_quota_unlock(ip);
403 out:
404 return error;
405 }
406
gfs2_init_dir(struct buffer_head * dibh,const struct gfs2_inode * parent)407 static void gfs2_init_dir(struct buffer_head *dibh,
408 const struct gfs2_inode *parent)
409 {
410 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
411 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
412
413 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
414 dent->de_inum = di->di_num; /* already GFS2 endian */
415 dent->de_type = cpu_to_be16(DT_DIR);
416
417 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
418 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
419 gfs2_inum_out(parent, dent);
420 dent->de_type = cpu_to_be16(DT_DIR);
421
422 }
423
424 /**
425 * gfs2_init_xattr - Initialise an xattr block for a new inode
426 * @ip: The inode in question
427 *
428 * This sets up an empty xattr block for a new inode, ready to
429 * take any ACLs, LSM xattrs, etc.
430 */
431
gfs2_init_xattr(struct gfs2_inode * ip)432 static void gfs2_init_xattr(struct gfs2_inode *ip)
433 {
434 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
435 struct buffer_head *bh;
436 struct gfs2_ea_header *ea;
437
438 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
439 gfs2_trans_add_meta(ip->i_gl, bh);
440 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
441 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
442
443 ea = GFS2_EA_BH2FIRST(bh);
444 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
445 ea->ea_type = GFS2_EATYPE_UNUSED;
446 ea->ea_flags = GFS2_EAFLAG_LAST;
447
448 brelse(bh);
449 }
450
451 /**
452 * init_dinode - Fill in a new dinode structure
453 * @dip: The directory this inode is being created in
454 * @ip: The inode
455 * @symname: The symlink destination (if a symlink)
456 * @bhp: The buffer head (returned to caller)
457 *
458 */
459
init_dinode(struct gfs2_inode * dip,struct gfs2_inode * ip,const char * symname)460 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
461 const char *symname)
462 {
463 struct gfs2_dinode *di;
464 struct buffer_head *dibh;
465
466 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
467 gfs2_trans_add_meta(ip->i_gl, dibh);
468 di = (struct gfs2_dinode *)dibh->b_data;
469 gfs2_dinode_out(ip, di);
470
471 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
472 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
473 di->__pad1 = 0;
474 di->__pad2 = 0;
475 di->__pad3 = 0;
476 memset(&di->__pad4, 0, sizeof(di->__pad4));
477 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
478 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
479
480 switch(ip->i_inode.i_mode & S_IFMT) {
481 case S_IFDIR:
482 gfs2_init_dir(dibh, dip);
483 break;
484 case S_IFLNK:
485 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
486 break;
487 }
488
489 set_buffer_uptodate(dibh);
490 brelse(dibh);
491 }
492
493 /**
494 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
495 * @dip: The directory we are linking into
496 * @da: The dir add information
497 * @nr_inodes: The number of inodes involved
498 *
499 * This calculate the number of blocks we need to reserve in a
500 * transaction to link @nr_inodes into a directory. In most cases
501 * @nr_inodes will be 2 (the directory plus the inode being linked in)
502 * but in case of rename, 4 may be required.
503 *
504 * Returns: Number of blocks
505 */
506
gfs2_trans_da_blks(const struct gfs2_inode * dip,const struct gfs2_diradd * da,unsigned nr_inodes)507 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
508 const struct gfs2_diradd *da,
509 unsigned nr_inodes)
510 {
511 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
512 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
513 }
514
link_dinode(struct gfs2_inode * dip,const struct qstr * name,struct gfs2_inode * ip,struct gfs2_diradd * da)515 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
516 struct gfs2_inode *ip, struct gfs2_diradd *da)
517 {
518 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
519 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
520 int error;
521
522 if (da->nr_blocks) {
523 error = gfs2_quota_lock_check(dip, &ap);
524 if (error)
525 goto fail_quota_locks;
526
527 error = gfs2_inplace_reserve(dip, &ap);
528 if (error)
529 goto fail_quota_locks;
530
531 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
532 if (error)
533 goto fail_ipreserv;
534 } else {
535 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
536 if (error)
537 goto fail_quota_locks;
538 }
539
540 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
541
542 gfs2_trans_end(sdp);
543 fail_ipreserv:
544 gfs2_inplace_release(dip);
545 fail_quota_locks:
546 gfs2_quota_unlock(dip);
547 return error;
548 }
549
gfs2_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)550 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
551 void *fs_info)
552 {
553 const struct xattr *xattr;
554 int err = 0;
555
556 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
557 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
558 xattr->value_len, 0,
559 GFS2_EATYPE_SECURITY);
560 if (err < 0)
561 break;
562 }
563 return err;
564 }
565
566 /**
567 * gfs2_create_inode - Create a new inode
568 * @dir: The parent directory
569 * @dentry: The new dentry
570 * @file: If non-NULL, the file which is being opened
571 * @mode: The permissions on the new inode
572 * @dev: For device nodes, this is the device number
573 * @symname: For symlinks, this is the link destination
574 * @size: The initial size of the inode (ignored for directories)
575 *
576 * Returns: 0 on success, or error code
577 */
578
gfs2_create_inode(struct inode * dir,struct dentry * dentry,struct file * file,umode_t mode,dev_t dev,const char * symname,unsigned int size,int excl,int * opened)579 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
580 struct file *file,
581 umode_t mode, dev_t dev, const char *symname,
582 unsigned int size, int excl, int *opened)
583 {
584 const struct qstr *name = &dentry->d_name;
585 struct posix_acl *default_acl, *acl;
586 struct gfs2_holder ghs[2];
587 struct inode *inode = NULL;
588 struct gfs2_inode *dip = GFS2_I(dir), *ip;
589 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
590 struct gfs2_glock *io_gl = NULL;
591 int error, free_vfs_inode = 1;
592 u32 aflags = 0;
593 unsigned blocks = 1;
594 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
595
596 if (!name->len || name->len > GFS2_FNAMESIZE)
597 return -ENAMETOOLONG;
598
599 error = gfs2_rsqa_alloc(dip);
600 if (error)
601 return error;
602
603 error = gfs2_rindex_update(sdp);
604 if (error)
605 return error;
606
607 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
608 if (error)
609 goto fail;
610 gfs2_holder_mark_uninitialized(ghs + 1);
611
612 error = create_ok(dip, name, mode);
613 if (error)
614 goto fail_gunlock;
615
616 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
617 error = PTR_ERR(inode);
618 if (!IS_ERR(inode)) {
619 if (S_ISDIR(inode->i_mode)) {
620 iput(inode);
621 inode = ERR_PTR(-EISDIR);
622 goto fail_gunlock;
623 }
624 d_instantiate(dentry, inode);
625 error = 0;
626 if (file) {
627 if (S_ISREG(inode->i_mode))
628 error = finish_open(file, dentry, gfs2_open_common, opened);
629 else
630 error = finish_no_open(file, NULL);
631 }
632 gfs2_glock_dq_uninit(ghs);
633 return error;
634 } else if (error != -ENOENT) {
635 goto fail_gunlock;
636 }
637
638 error = gfs2_diradd_alloc_required(dir, name, &da);
639 if (error < 0)
640 goto fail_gunlock;
641
642 inode = new_inode(sdp->sd_vfs);
643 error = -ENOMEM;
644 if (!inode)
645 goto fail_gunlock;
646
647 error = posix_acl_create(dir, &mode, &default_acl, &acl);
648 if (error)
649 goto fail_gunlock;
650
651 ip = GFS2_I(inode);
652 error = gfs2_rsqa_alloc(ip);
653 if (error)
654 goto fail_free_acls;
655
656 inode->i_mode = mode;
657 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
658 inode->i_rdev = dev;
659 inode->i_size = size;
660 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
661 gfs2_set_inode_blocks(inode, 1);
662 munge_mode_uid_gid(dip, inode);
663 check_and_update_goal(dip);
664 ip->i_goal = dip->i_goal;
665 ip->i_diskflags = 0;
666 ip->i_eattr = 0;
667 ip->i_height = 0;
668 ip->i_depth = 0;
669 ip->i_entries = 0;
670 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
671
672 switch(mode & S_IFMT) {
673 case S_IFREG:
674 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
675 gfs2_tune_get(sdp, gt_new_files_jdata))
676 ip->i_diskflags |= GFS2_DIF_JDATA;
677 gfs2_set_aops(inode);
678 break;
679 case S_IFDIR:
680 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
681 ip->i_diskflags |= GFS2_DIF_JDATA;
682 ip->i_entries = 2;
683 break;
684 }
685
686 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
687 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
688 ip->i_diskflags |= GFS2_DIF_SYSTEM;
689
690 gfs2_set_inode_flags(inode);
691
692 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
693 (dip->i_diskflags & GFS2_DIF_TOPDIR))
694 aflags |= GFS2_AF_ORLOV;
695
696 if (default_acl || acl)
697 blocks++;
698
699 error = alloc_dinode(ip, aflags, &blocks);
700 if (error)
701 goto fail_free_inode;
702
703 gfs2_set_inode_blocks(inode, blocks);
704
705 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
706 if (error)
707 goto fail_free_inode;
708 flush_delayed_work(&ip->i_gl->gl_work);
709 glock_set_object(ip->i_gl, ip);
710
711 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
712 if (error)
713 goto fail_free_inode;
714
715 error = gfs2_trans_begin(sdp, blocks, 0);
716 if (error)
717 goto fail_gunlock2;
718
719 if (blocks > 1) {
720 ip->i_eattr = ip->i_no_addr + 1;
721 gfs2_init_xattr(ip);
722 }
723 init_dinode(dip, ip, symname);
724 gfs2_trans_end(sdp);
725
726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
727 if (error)
728 goto fail_gunlock2;
729
730 BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
731
732 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
733 if (error)
734 goto fail_gunlock2;
735
736 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
737 gfs2_glock_put(io_gl);
738 gfs2_set_iop(inode);
739 insert_inode_hash(inode);
740
741 free_vfs_inode = 0; /* After this point, the inode is no longer
742 considered free. Any failures need to undo
743 the gfs2 structures. */
744 if (default_acl) {
745 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
746 if (error)
747 goto fail_gunlock3;
748 posix_acl_release(default_acl);
749 default_acl = NULL;
750 }
751 if (acl) {
752 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
753 if (error)
754 goto fail_gunlock3;
755 posix_acl_release(acl);
756 acl = NULL;
757 }
758
759 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
760 &gfs2_initxattrs, NULL);
761 if (error)
762 goto fail_gunlock3;
763
764 error = link_dinode(dip, name, ip, &da);
765 if (error)
766 goto fail_gunlock3;
767
768 mark_inode_dirty(inode);
769 d_instantiate(dentry, inode);
770 if (file) {
771 *opened |= FILE_CREATED;
772 error = finish_open(file, dentry, gfs2_open_common, opened);
773 }
774 gfs2_glock_dq_uninit(ghs);
775 gfs2_glock_dq_uninit(ghs + 1);
776 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
777 return error;
778
779 fail_gunlock3:
780 glock_clear_object(io_gl, ip);
781 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
782 gfs2_glock_put(io_gl);
783 fail_gunlock2:
784 if (io_gl)
785 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
786 fail_free_inode:
787 if (ip->i_gl) {
788 glock_clear_object(ip->i_gl, ip);
789 gfs2_glock_put(ip->i_gl);
790 }
791 gfs2_rsqa_delete(ip, NULL);
792 fail_free_acls:
793 posix_acl_release(default_acl);
794 posix_acl_release(acl);
795 fail_gunlock:
796 gfs2_dir_no_add(&da);
797 gfs2_glock_dq_uninit(ghs);
798 if (inode && !IS_ERR(inode)) {
799 clear_nlink(inode);
800 if (!free_vfs_inode)
801 mark_inode_dirty(inode);
802 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
803 &GFS2_I(inode)->i_flags);
804 iput(inode);
805 }
806 if (gfs2_holder_initialized(ghs + 1))
807 gfs2_glock_dq_uninit(ghs + 1);
808 fail:
809 return error;
810 }
811
812 /**
813 * gfs2_create - Create a file
814 * @dir: The directory in which to create the file
815 * @dentry: The dentry of the new file
816 * @mode: The mode of the new file
817 *
818 * Returns: errno
819 */
820
gfs2_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)821 static int gfs2_create(struct inode *dir, struct dentry *dentry,
822 umode_t mode, bool excl)
823 {
824 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
825 }
826
827 /**
828 * __gfs2_lookup - Look up a filename in a directory and return its inode
829 * @dir: The directory inode
830 * @dentry: The dentry of the new inode
831 * @file: File to be opened
832 * @opened: atomic_open flags
833 *
834 *
835 * Returns: errno
836 */
837
__gfs2_lookup(struct inode * dir,struct dentry * dentry,struct file * file,int * opened)838 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
839 struct file *file, int *opened)
840 {
841 struct inode *inode;
842 struct dentry *d;
843 struct gfs2_holder gh;
844 struct gfs2_glock *gl;
845 int error;
846
847 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
848 if (inode == NULL) {
849 d_add(dentry, NULL);
850 return NULL;
851 }
852 if (IS_ERR(inode))
853 return ERR_CAST(inode);
854
855 gl = GFS2_I(inode)->i_gl;
856 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
857 if (error) {
858 iput(inode);
859 return ERR_PTR(error);
860 }
861
862 d = d_splice_alias(inode, dentry);
863 if (IS_ERR(d)) {
864 gfs2_glock_dq_uninit(&gh);
865 return d;
866 }
867 if (file && S_ISREG(inode->i_mode))
868 error = finish_open(file, dentry, gfs2_open_common, opened);
869
870 gfs2_glock_dq_uninit(&gh);
871 if (error) {
872 dput(d);
873 return ERR_PTR(error);
874 }
875 return d;
876 }
877
gfs2_lookup(struct inode * dir,struct dentry * dentry,unsigned flags)878 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
879 unsigned flags)
880 {
881 return __gfs2_lookup(dir, dentry, NULL, NULL);
882 }
883
884 /**
885 * gfs2_link - Link to a file
886 * @old_dentry: The inode to link
887 * @dir: Add link to this directory
888 * @dentry: The name of the link
889 *
890 * Link the inode in "old_dentry" into the directory "dir" with the
891 * name in "dentry".
892 *
893 * Returns: errno
894 */
895
gfs2_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)896 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
897 struct dentry *dentry)
898 {
899 struct gfs2_inode *dip = GFS2_I(dir);
900 struct gfs2_sbd *sdp = GFS2_SB(dir);
901 struct inode *inode = d_inode(old_dentry);
902 struct gfs2_inode *ip = GFS2_I(inode);
903 struct gfs2_holder ghs[2];
904 struct buffer_head *dibh;
905 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
906 int error;
907
908 if (S_ISDIR(inode->i_mode))
909 return -EPERM;
910
911 error = gfs2_rsqa_alloc(dip);
912 if (error)
913 return error;
914
915 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
916 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
917
918 error = gfs2_glock_nq(ghs); /* parent */
919 if (error)
920 goto out_parent;
921
922 error = gfs2_glock_nq(ghs + 1); /* child */
923 if (error)
924 goto out_child;
925
926 error = -ENOENT;
927 if (inode->i_nlink == 0)
928 goto out_gunlock;
929
930 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
931 if (error)
932 goto out_gunlock;
933
934 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
935 switch (error) {
936 case -ENOENT:
937 break;
938 case 0:
939 error = -EEXIST;
940 default:
941 goto out_gunlock;
942 }
943
944 error = -EINVAL;
945 if (!dip->i_inode.i_nlink)
946 goto out_gunlock;
947 error = -EFBIG;
948 if (dip->i_entries == (u32)-1)
949 goto out_gunlock;
950 error = -EPERM;
951 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
952 goto out_gunlock;
953 error = -EINVAL;
954 if (!ip->i_inode.i_nlink)
955 goto out_gunlock;
956 error = -EMLINK;
957 if (ip->i_inode.i_nlink == (u32)-1)
958 goto out_gunlock;
959
960 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
961 if (error < 0)
962 goto out_gunlock;
963
964 if (da.nr_blocks) {
965 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
966 error = gfs2_quota_lock_check(dip, &ap);
967 if (error)
968 goto out_gunlock;
969
970 error = gfs2_inplace_reserve(dip, &ap);
971 if (error)
972 goto out_gunlock_q;
973
974 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
975 if (error)
976 goto out_ipres;
977 } else {
978 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
979 if (error)
980 goto out_ipres;
981 }
982
983 error = gfs2_meta_inode_buffer(ip, &dibh);
984 if (error)
985 goto out_end_trans;
986
987 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
988 if (error)
989 goto out_brelse;
990
991 gfs2_trans_add_meta(ip->i_gl, dibh);
992 inc_nlink(&ip->i_inode);
993 ip->i_inode.i_ctime = current_time(&ip->i_inode);
994 ihold(inode);
995 d_instantiate(dentry, inode);
996 mark_inode_dirty(inode);
997
998 out_brelse:
999 brelse(dibh);
1000 out_end_trans:
1001 gfs2_trans_end(sdp);
1002 out_ipres:
1003 if (da.nr_blocks)
1004 gfs2_inplace_release(dip);
1005 out_gunlock_q:
1006 if (da.nr_blocks)
1007 gfs2_quota_unlock(dip);
1008 out_gunlock:
1009 gfs2_dir_no_add(&da);
1010 gfs2_glock_dq(ghs + 1);
1011 out_child:
1012 gfs2_glock_dq(ghs);
1013 out_parent:
1014 gfs2_holder_uninit(ghs);
1015 gfs2_holder_uninit(ghs + 1);
1016 return error;
1017 }
1018
1019 /*
1020 * gfs2_unlink_ok - check to see that a inode is still in a directory
1021 * @dip: the directory
1022 * @name: the name of the file
1023 * @ip: the inode
1024 *
1025 * Assumes that the lock on (at least) @dip is held.
1026 *
1027 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1028 */
1029
gfs2_unlink_ok(struct gfs2_inode * dip,const struct qstr * name,const struct gfs2_inode * ip)1030 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1031 const struct gfs2_inode *ip)
1032 {
1033 int error;
1034
1035 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1036 return -EPERM;
1037
1038 if ((dip->i_inode.i_mode & S_ISVTX) &&
1039 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1040 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1041 return -EPERM;
1042
1043 if (IS_APPEND(&dip->i_inode))
1044 return -EPERM;
1045
1046 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1047 if (error)
1048 return error;
1049
1050 return gfs2_dir_check(&dip->i_inode, name, ip);
1051 }
1052
1053 /**
1054 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1055 * @dip: The parent directory
1056 * @name: The name of the entry in the parent directory
1057 * @inode: The inode to be removed
1058 *
1059 * Called with all the locks and in a transaction. This will only be
1060 * called for a directory after it has been checked to ensure it is empty.
1061 *
1062 * Returns: 0 on success, or an error
1063 */
1064
gfs2_unlink_inode(struct gfs2_inode * dip,const struct dentry * dentry)1065 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1066 const struct dentry *dentry)
1067 {
1068 struct inode *inode = d_inode(dentry);
1069 struct gfs2_inode *ip = GFS2_I(inode);
1070 int error;
1071
1072 error = gfs2_dir_del(dip, dentry);
1073 if (error)
1074 return error;
1075
1076 ip->i_entries = 0;
1077 inode->i_ctime = current_time(inode);
1078 if (S_ISDIR(inode->i_mode))
1079 clear_nlink(inode);
1080 else
1081 drop_nlink(inode);
1082 mark_inode_dirty(inode);
1083 if (inode->i_nlink == 0)
1084 gfs2_unlink_di(inode);
1085 return 0;
1086 }
1087
1088
1089 /**
1090 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1091 * @dir: The inode of the directory containing the inode to unlink
1092 * @dentry: The file itself
1093 *
1094 * This routine uses the type of the inode as a flag to figure out
1095 * whether this is an unlink or an rmdir.
1096 *
1097 * Returns: errno
1098 */
1099
gfs2_unlink(struct inode * dir,struct dentry * dentry)1100 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1101 {
1102 struct gfs2_inode *dip = GFS2_I(dir);
1103 struct gfs2_sbd *sdp = GFS2_SB(dir);
1104 struct inode *inode = d_inode(dentry);
1105 struct gfs2_inode *ip = GFS2_I(inode);
1106 struct gfs2_holder ghs[3];
1107 struct gfs2_rgrpd *rgd;
1108 int error;
1109
1110 error = gfs2_rindex_update(sdp);
1111 if (error)
1112 return error;
1113
1114 error = -EROFS;
1115
1116 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1117 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1118
1119 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1120 if (!rgd)
1121 goto out_inodes;
1122
1123 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1124
1125
1126 error = gfs2_glock_nq(ghs); /* parent */
1127 if (error)
1128 goto out_parent;
1129
1130 error = gfs2_glock_nq(ghs + 1); /* child */
1131 if (error)
1132 goto out_child;
1133
1134 error = -ENOENT;
1135 if (inode->i_nlink == 0)
1136 goto out_rgrp;
1137
1138 if (S_ISDIR(inode->i_mode)) {
1139 error = -ENOTEMPTY;
1140 if (ip->i_entries > 2 || inode->i_nlink > 2)
1141 goto out_rgrp;
1142 }
1143
1144 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1145 if (error)
1146 goto out_rgrp;
1147
1148 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1149 if (error)
1150 goto out_gunlock;
1151
1152 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1153 if (error)
1154 goto out_end_trans;
1155
1156 error = gfs2_unlink_inode(dip, dentry);
1157
1158 out_end_trans:
1159 gfs2_trans_end(sdp);
1160 out_gunlock:
1161 gfs2_glock_dq(ghs + 2);
1162 out_rgrp:
1163 gfs2_glock_dq(ghs + 1);
1164 out_child:
1165 gfs2_glock_dq(ghs);
1166 out_parent:
1167 gfs2_holder_uninit(ghs + 2);
1168 out_inodes:
1169 gfs2_holder_uninit(ghs + 1);
1170 gfs2_holder_uninit(ghs);
1171 return error;
1172 }
1173
1174 /**
1175 * gfs2_symlink - Create a symlink
1176 * @dir: The directory to create the symlink in
1177 * @dentry: The dentry to put the symlink in
1178 * @symname: The thing which the link points to
1179 *
1180 * Returns: errno
1181 */
1182
gfs2_symlink(struct inode * dir,struct dentry * dentry,const char * symname)1183 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1184 const char *symname)
1185 {
1186 struct gfs2_sbd *sdp = GFS2_SB(dir);
1187 unsigned int size;
1188
1189 size = strlen(symname);
1190 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1191 return -ENAMETOOLONG;
1192
1193 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1194 }
1195
1196 /**
1197 * gfs2_mkdir - Make a directory
1198 * @dir: The parent directory of the new one
1199 * @dentry: The dentry of the new directory
1200 * @mode: The mode of the new directory
1201 *
1202 * Returns: errno
1203 */
1204
gfs2_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)1205 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1206 {
1207 struct gfs2_sbd *sdp = GFS2_SB(dir);
1208 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1209 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1210 }
1211
1212 /**
1213 * gfs2_mknod - Make a special file
1214 * @dir: The directory in which the special file will reside
1215 * @dentry: The dentry of the special file
1216 * @mode: The mode of the special file
1217 * @dev: The device specification of the special file
1218 *
1219 */
1220
gfs2_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t dev)1221 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1222 dev_t dev)
1223 {
1224 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1225 }
1226
1227 /**
1228 * gfs2_atomic_open - Atomically open a file
1229 * @dir: The directory
1230 * @dentry: The proposed new entry
1231 * @file: The proposed new struct file
1232 * @flags: open flags
1233 * @mode: File mode
1234 * @opened: Flag to say whether the file has been opened or not
1235 *
1236 * Returns: error code or 0 for success
1237 */
1238
gfs2_atomic_open(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t mode,int * opened)1239 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1240 struct file *file, unsigned flags,
1241 umode_t mode, int *opened)
1242 {
1243 struct dentry *d;
1244 bool excl = !!(flags & O_EXCL);
1245
1246 if (!d_in_lookup(dentry))
1247 goto skip_lookup;
1248
1249 d = __gfs2_lookup(dir, dentry, file, opened);
1250 if (IS_ERR(d))
1251 return PTR_ERR(d);
1252 if (d != NULL)
1253 dentry = d;
1254 if (d_really_is_positive(dentry)) {
1255 if (!(*opened & FILE_OPENED))
1256 return finish_no_open(file, d);
1257 dput(d);
1258 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1259 }
1260
1261 BUG_ON(d != NULL);
1262
1263 skip_lookup:
1264 if (!(flags & O_CREAT))
1265 return -ENOENT;
1266
1267 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1268 }
1269
1270 /*
1271 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1272 * @this: move this
1273 * @to: to here
1274 *
1275 * Follow @to back to the root and make sure we don't encounter @this
1276 * Assumes we already hold the rename lock.
1277 *
1278 * Returns: errno
1279 */
1280
gfs2_ok_to_move(struct gfs2_inode * this,struct gfs2_inode * to)1281 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1282 {
1283 struct inode *dir = &to->i_inode;
1284 struct super_block *sb = dir->i_sb;
1285 struct inode *tmp;
1286 int error = 0;
1287
1288 igrab(dir);
1289
1290 for (;;) {
1291 if (dir == &this->i_inode) {
1292 error = -EINVAL;
1293 break;
1294 }
1295 if (dir == d_inode(sb->s_root)) {
1296 error = 0;
1297 break;
1298 }
1299
1300 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1301 if (!tmp) {
1302 error = -ENOENT;
1303 break;
1304 }
1305 if (IS_ERR(tmp)) {
1306 error = PTR_ERR(tmp);
1307 break;
1308 }
1309
1310 iput(dir);
1311 dir = tmp;
1312 }
1313
1314 iput(dir);
1315
1316 return error;
1317 }
1318
1319 /**
1320 * update_moved_ino - Update an inode that's being moved
1321 * @ip: The inode being moved
1322 * @ndip: The parent directory of the new filename
1323 * @dir_rename: True of ip is a directory
1324 *
1325 * Returns: errno
1326 */
1327
update_moved_ino(struct gfs2_inode * ip,struct gfs2_inode * ndip,int dir_rename)1328 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1329 int dir_rename)
1330 {
1331 int error;
1332 struct buffer_head *dibh;
1333
1334 if (dir_rename)
1335 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1336
1337 error = gfs2_meta_inode_buffer(ip, &dibh);
1338 if (error)
1339 return error;
1340 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1341 gfs2_trans_add_meta(ip->i_gl, dibh);
1342 gfs2_dinode_out(ip, dibh->b_data);
1343 brelse(dibh);
1344 return 0;
1345 }
1346
1347
1348 /**
1349 * gfs2_rename - Rename a file
1350 * @odir: Parent directory of old file name
1351 * @odentry: The old dentry of the file
1352 * @ndir: Parent directory of new file name
1353 * @ndentry: The new dentry of the file
1354 *
1355 * Returns: errno
1356 */
1357
gfs2_rename(struct inode * odir,struct dentry * odentry,struct inode * ndir,struct dentry * ndentry)1358 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1359 struct inode *ndir, struct dentry *ndentry)
1360 {
1361 struct gfs2_inode *odip = GFS2_I(odir);
1362 struct gfs2_inode *ndip = GFS2_I(ndir);
1363 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1364 struct gfs2_inode *nip = NULL;
1365 struct gfs2_sbd *sdp = GFS2_SB(odir);
1366 struct gfs2_holder ghs[5], r_gh;
1367 struct gfs2_rgrpd *nrgd;
1368 unsigned int num_gh;
1369 int dir_rename = 0;
1370 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1371 unsigned int x;
1372 int error;
1373
1374 gfs2_holder_mark_uninitialized(&r_gh);
1375 if (d_really_is_positive(ndentry)) {
1376 nip = GFS2_I(d_inode(ndentry));
1377 if (ip == nip)
1378 return 0;
1379 }
1380
1381 error = gfs2_rindex_update(sdp);
1382 if (error)
1383 return error;
1384
1385 error = gfs2_rsqa_alloc(ndip);
1386 if (error)
1387 return error;
1388
1389 if (odip != ndip) {
1390 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1391 0, &r_gh);
1392 if (error)
1393 goto out;
1394
1395 if (S_ISDIR(ip->i_inode.i_mode)) {
1396 dir_rename = 1;
1397 /* don't move a directory into its subdir */
1398 error = gfs2_ok_to_move(ip, ndip);
1399 if (error)
1400 goto out_gunlock_r;
1401 }
1402 }
1403
1404 num_gh = 1;
1405 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1406 if (odip != ndip) {
1407 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1408 num_gh++;
1409 }
1410 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1411 num_gh++;
1412
1413 if (nip) {
1414 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1415 num_gh++;
1416 /* grab the resource lock for unlink flag twiddling
1417 * this is the case of the target file already existing
1418 * so we unlink before doing the rename
1419 */
1420 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1421 if (nrgd)
1422 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1423 }
1424
1425 for (x = 0; x < num_gh; x++) {
1426 error = gfs2_glock_nq(ghs + x);
1427 if (error)
1428 goto out_gunlock;
1429 }
1430
1431 error = -ENOENT;
1432 if (ip->i_inode.i_nlink == 0)
1433 goto out_gunlock;
1434
1435 /* Check out the old directory */
1436
1437 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1438 if (error)
1439 goto out_gunlock;
1440
1441 /* Check out the new directory */
1442
1443 if (nip) {
1444 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1445 if (error)
1446 goto out_gunlock;
1447
1448 if (nip->i_inode.i_nlink == 0) {
1449 error = -EAGAIN;
1450 goto out_gunlock;
1451 }
1452
1453 if (S_ISDIR(nip->i_inode.i_mode)) {
1454 if (nip->i_entries < 2) {
1455 gfs2_consist_inode(nip);
1456 error = -EIO;
1457 goto out_gunlock;
1458 }
1459 if (nip->i_entries > 2) {
1460 error = -ENOTEMPTY;
1461 goto out_gunlock;
1462 }
1463 }
1464 } else {
1465 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1466 if (error)
1467 goto out_gunlock;
1468
1469 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1470 switch (error) {
1471 case -ENOENT:
1472 error = 0;
1473 break;
1474 case 0:
1475 error = -EEXIST;
1476 default:
1477 goto out_gunlock;
1478 };
1479
1480 if (odip != ndip) {
1481 if (!ndip->i_inode.i_nlink) {
1482 error = -ENOENT;
1483 goto out_gunlock;
1484 }
1485 if (ndip->i_entries == (u32)-1) {
1486 error = -EFBIG;
1487 goto out_gunlock;
1488 }
1489 if (S_ISDIR(ip->i_inode.i_mode) &&
1490 ndip->i_inode.i_nlink == (u32)-1) {
1491 error = -EMLINK;
1492 goto out_gunlock;
1493 }
1494 }
1495 }
1496
1497 /* Check out the dir to be renamed */
1498
1499 if (dir_rename) {
1500 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1501 if (error)
1502 goto out_gunlock;
1503 }
1504
1505 if (nip == NULL) {
1506 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1507 if (error)
1508 goto out_gunlock;
1509 }
1510
1511 if (da.nr_blocks) {
1512 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1513 error = gfs2_quota_lock_check(ndip, &ap);
1514 if (error)
1515 goto out_gunlock;
1516
1517 error = gfs2_inplace_reserve(ndip, &ap);
1518 if (error)
1519 goto out_gunlock_q;
1520
1521 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1522 4 * RES_LEAF + 4, 0);
1523 if (error)
1524 goto out_ipreserv;
1525 } else {
1526 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1527 5 * RES_LEAF + 4, 0);
1528 if (error)
1529 goto out_gunlock;
1530 }
1531
1532 /* Remove the target file, if it exists */
1533
1534 if (nip)
1535 error = gfs2_unlink_inode(ndip, ndentry);
1536
1537 error = update_moved_ino(ip, ndip, dir_rename);
1538 if (error)
1539 goto out_end_trans;
1540
1541 error = gfs2_dir_del(odip, odentry);
1542 if (error)
1543 goto out_end_trans;
1544
1545 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1546 if (error)
1547 goto out_end_trans;
1548
1549 out_end_trans:
1550 gfs2_trans_end(sdp);
1551 out_ipreserv:
1552 if (da.nr_blocks)
1553 gfs2_inplace_release(ndip);
1554 out_gunlock_q:
1555 if (da.nr_blocks)
1556 gfs2_quota_unlock(ndip);
1557 out_gunlock:
1558 gfs2_dir_no_add(&da);
1559 while (x--) {
1560 gfs2_glock_dq(ghs + x);
1561 gfs2_holder_uninit(ghs + x);
1562 }
1563 out_gunlock_r:
1564 if (gfs2_holder_initialized(&r_gh))
1565 gfs2_glock_dq_uninit(&r_gh);
1566 out:
1567 return error;
1568 }
1569
1570 /**
1571 * gfs2_exchange - exchange two files
1572 * @odir: Parent directory of old file name
1573 * @odentry: The old dentry of the file
1574 * @ndir: Parent directory of new file name
1575 * @ndentry: The new dentry of the file
1576 * @flags: The rename flags
1577 *
1578 * Returns: errno
1579 */
1580
gfs2_exchange(struct inode * odir,struct dentry * odentry,struct inode * ndir,struct dentry * ndentry,unsigned int flags)1581 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1582 struct inode *ndir, struct dentry *ndentry,
1583 unsigned int flags)
1584 {
1585 struct gfs2_inode *odip = GFS2_I(odir);
1586 struct gfs2_inode *ndip = GFS2_I(ndir);
1587 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1588 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1589 struct gfs2_sbd *sdp = GFS2_SB(odir);
1590 struct gfs2_holder ghs[5], r_gh;
1591 unsigned int num_gh;
1592 unsigned int x;
1593 umode_t old_mode = oip->i_inode.i_mode;
1594 umode_t new_mode = nip->i_inode.i_mode;
1595 int error;
1596
1597 gfs2_holder_mark_uninitialized(&r_gh);
1598 error = gfs2_rindex_update(sdp);
1599 if (error)
1600 return error;
1601
1602 if (odip != ndip) {
1603 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1604 0, &r_gh);
1605 if (error)
1606 goto out;
1607
1608 if (S_ISDIR(old_mode)) {
1609 /* don't move a directory into its subdir */
1610 error = gfs2_ok_to_move(oip, ndip);
1611 if (error)
1612 goto out_gunlock_r;
1613 }
1614
1615 if (S_ISDIR(new_mode)) {
1616 /* don't move a directory into its subdir */
1617 error = gfs2_ok_to_move(nip, odip);
1618 if (error)
1619 goto out_gunlock_r;
1620 }
1621 }
1622
1623 num_gh = 1;
1624 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1625 if (odip != ndip) {
1626 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1627 num_gh++;
1628 }
1629 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1630 num_gh++;
1631
1632 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1633 num_gh++;
1634
1635 for (x = 0; x < num_gh; x++) {
1636 error = gfs2_glock_nq(ghs + x);
1637 if (error)
1638 goto out_gunlock;
1639 }
1640
1641 error = -ENOENT;
1642 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1643 goto out_gunlock;
1644
1645 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1646 if (error)
1647 goto out_gunlock;
1648 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1649 if (error)
1650 goto out_gunlock;
1651
1652 if (S_ISDIR(old_mode)) {
1653 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1654 if (error)
1655 goto out_gunlock;
1656 }
1657 if (S_ISDIR(new_mode)) {
1658 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1659 if (error)
1660 goto out_gunlock;
1661 }
1662 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1663 if (error)
1664 goto out_gunlock;
1665
1666 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1667 if (error)
1668 goto out_end_trans;
1669
1670 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1671 if (error)
1672 goto out_end_trans;
1673
1674 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1675 IF2DT(old_mode));
1676 if (error)
1677 goto out_end_trans;
1678
1679 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1680 IF2DT(new_mode));
1681 if (error)
1682 goto out_end_trans;
1683
1684 if (odip != ndip) {
1685 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1686 inc_nlink(&odip->i_inode);
1687 drop_nlink(&ndip->i_inode);
1688 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1689 inc_nlink(&ndip->i_inode);
1690 drop_nlink(&odip->i_inode);
1691 }
1692 }
1693 mark_inode_dirty(&ndip->i_inode);
1694 if (odip != ndip)
1695 mark_inode_dirty(&odip->i_inode);
1696
1697 out_end_trans:
1698 gfs2_trans_end(sdp);
1699 out_gunlock:
1700 while (x--) {
1701 gfs2_glock_dq(ghs + x);
1702 gfs2_holder_uninit(ghs + x);
1703 }
1704 out_gunlock_r:
1705 if (gfs2_holder_initialized(&r_gh))
1706 gfs2_glock_dq_uninit(&r_gh);
1707 out:
1708 return error;
1709 }
1710
gfs2_rename2(struct inode * odir,struct dentry * odentry,struct inode * ndir,struct dentry * ndentry,unsigned int flags)1711 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1712 struct inode *ndir, struct dentry *ndentry,
1713 unsigned int flags)
1714 {
1715 flags &= ~RENAME_NOREPLACE;
1716
1717 if (flags & ~RENAME_EXCHANGE)
1718 return -EINVAL;
1719
1720 if (flags & RENAME_EXCHANGE)
1721 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1722
1723 return gfs2_rename(odir, odentry, ndir, ndentry);
1724 }
1725
1726 /**
1727 * gfs2_get_link - Follow a symbolic link
1728 * @dentry: The dentry of the link
1729 * @inode: The inode of the link
1730 * @done: destructor for return value
1731 *
1732 * This can handle symlinks of any size.
1733 *
1734 * Returns: 0 on success or error code
1735 */
1736
gfs2_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1737 static const char *gfs2_get_link(struct dentry *dentry,
1738 struct inode *inode,
1739 struct delayed_call *done)
1740 {
1741 struct gfs2_inode *ip = GFS2_I(inode);
1742 struct gfs2_holder i_gh;
1743 struct buffer_head *dibh;
1744 unsigned int size;
1745 char *buf;
1746 int error;
1747
1748 if (!dentry)
1749 return ERR_PTR(-ECHILD);
1750
1751 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1752 error = gfs2_glock_nq(&i_gh);
1753 if (error) {
1754 gfs2_holder_uninit(&i_gh);
1755 return ERR_PTR(error);
1756 }
1757
1758 size = (unsigned int)i_size_read(&ip->i_inode);
1759 if (size == 0) {
1760 gfs2_consist_inode(ip);
1761 buf = ERR_PTR(-EIO);
1762 goto out;
1763 }
1764
1765 error = gfs2_meta_inode_buffer(ip, &dibh);
1766 if (error) {
1767 buf = ERR_PTR(error);
1768 goto out;
1769 }
1770
1771 buf = kzalloc(size + 1, GFP_NOFS);
1772 if (!buf)
1773 buf = ERR_PTR(-ENOMEM);
1774 else
1775 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1776 brelse(dibh);
1777 out:
1778 gfs2_glock_dq_uninit(&i_gh);
1779 if (!IS_ERR(buf))
1780 set_delayed_call(done, kfree_link, buf);
1781 return buf;
1782 }
1783
1784 /**
1785 * gfs2_permission -
1786 * @inode: The inode
1787 * @mask: The mask to be tested
1788 * @flags: Indicates whether this is an RCU path walk or not
1789 *
1790 * This may be called from the VFS directly, or from within GFS2 with the
1791 * inode locked, so we look to see if the glock is already locked and only
1792 * lock the glock if its not already been done.
1793 *
1794 * Returns: errno
1795 */
1796
gfs2_permission(struct inode * inode,int mask)1797 int gfs2_permission(struct inode *inode, int mask)
1798 {
1799 struct gfs2_inode *ip;
1800 struct gfs2_holder i_gh;
1801 int error;
1802
1803 gfs2_holder_mark_uninitialized(&i_gh);
1804 ip = GFS2_I(inode);
1805 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1806 if (mask & MAY_NOT_BLOCK)
1807 return -ECHILD;
1808 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1809 if (error)
1810 return error;
1811 }
1812
1813 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1814 error = -EPERM;
1815 else
1816 error = generic_permission(inode, mask);
1817 if (gfs2_holder_initialized(&i_gh))
1818 gfs2_glock_dq_uninit(&i_gh);
1819
1820 return error;
1821 }
1822
__gfs2_setattr_simple(struct inode * inode,struct iattr * attr)1823 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1824 {
1825 setattr_copy(inode, attr);
1826 mark_inode_dirty(inode);
1827 return 0;
1828 }
1829
1830 /**
1831 * gfs2_setattr_simple -
1832 * @ip:
1833 * @attr:
1834 *
1835 * Returns: errno
1836 */
1837
gfs2_setattr_simple(struct inode * inode,struct iattr * attr)1838 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1839 {
1840 int error;
1841
1842 if (current->journal_info)
1843 return __gfs2_setattr_simple(inode, attr);
1844
1845 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1846 if (error)
1847 return error;
1848
1849 error = __gfs2_setattr_simple(inode, attr);
1850 gfs2_trans_end(GFS2_SB(inode));
1851 return error;
1852 }
1853
setattr_chown(struct inode * inode,struct iattr * attr)1854 static int setattr_chown(struct inode *inode, struct iattr *attr)
1855 {
1856 struct gfs2_inode *ip = GFS2_I(inode);
1857 struct gfs2_sbd *sdp = GFS2_SB(inode);
1858 kuid_t ouid, nuid;
1859 kgid_t ogid, ngid;
1860 int error;
1861 struct gfs2_alloc_parms ap;
1862
1863 ouid = inode->i_uid;
1864 ogid = inode->i_gid;
1865 nuid = attr->ia_uid;
1866 ngid = attr->ia_gid;
1867
1868 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1869 ouid = nuid = NO_UID_QUOTA_CHANGE;
1870 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1871 ogid = ngid = NO_GID_QUOTA_CHANGE;
1872
1873 error = gfs2_rsqa_alloc(ip);
1874 if (error)
1875 goto out;
1876
1877 error = gfs2_rindex_update(sdp);
1878 if (error)
1879 goto out;
1880
1881 error = gfs2_quota_lock(ip, nuid, ngid);
1882 if (error)
1883 goto out;
1884
1885 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1886
1887 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1888 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1889 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1890 if (error)
1891 goto out_gunlock_q;
1892 }
1893
1894 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1895 if (error)
1896 goto out_gunlock_q;
1897
1898 error = gfs2_setattr_simple(inode, attr);
1899 if (error)
1900 goto out_end_trans;
1901
1902 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1903 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1904 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1905 gfs2_quota_change(ip, ap.target, nuid, ngid);
1906 }
1907
1908 out_end_trans:
1909 gfs2_trans_end(sdp);
1910 out_gunlock_q:
1911 gfs2_quota_unlock(ip);
1912 out:
1913 return error;
1914 }
1915
1916 /**
1917 * gfs2_setattr - Change attributes on an inode
1918 * @dentry: The dentry which is changing
1919 * @attr: The structure describing the change
1920 *
1921 * The VFS layer wants to change one or more of an inodes attributes. Write
1922 * that change out to disk.
1923 *
1924 * Returns: errno
1925 */
1926
gfs2_setattr(struct dentry * dentry,struct iattr * attr)1927 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1928 {
1929 struct inode *inode = d_inode(dentry);
1930 struct gfs2_inode *ip = GFS2_I(inode);
1931 struct gfs2_holder i_gh;
1932 int error;
1933
1934 error = gfs2_rsqa_alloc(ip);
1935 if (error)
1936 return error;
1937
1938 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1939 if (error)
1940 return error;
1941
1942 error = -EPERM;
1943 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1944 goto out;
1945
1946 error = setattr_prepare(dentry, attr);
1947 if (error)
1948 goto out;
1949
1950 if (attr->ia_valid & ATTR_SIZE)
1951 error = gfs2_setattr_size(inode, attr->ia_size);
1952 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1953 error = setattr_chown(inode, attr);
1954 else {
1955 error = gfs2_setattr_simple(inode, attr);
1956 if (!error && attr->ia_valid & ATTR_MODE)
1957 error = posix_acl_chmod(inode, inode->i_mode);
1958 }
1959
1960 out:
1961 if (!error)
1962 mark_inode_dirty(inode);
1963 gfs2_glock_dq_uninit(&i_gh);
1964 return error;
1965 }
1966
1967 /**
1968 * gfs2_getattr - Read out an inode's attributes
1969 * @path: Object to query
1970 * @stat: The inode's stats
1971 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1972 * @flags: AT_STATX_xxx setting
1973 *
1974 * This may be called from the VFS directly, or from within GFS2 with the
1975 * inode locked, so we look to see if the glock is already locked and only
1976 * lock the glock if its not already been done. Note that its the NFS
1977 * readdirplus operation which causes this to be called (from filldir)
1978 * with the glock already held.
1979 *
1980 * Returns: errno
1981 */
1982
gfs2_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)1983 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1984 u32 request_mask, unsigned int flags)
1985 {
1986 struct inode *inode = d_inode(path->dentry);
1987 struct gfs2_inode *ip = GFS2_I(inode);
1988 struct gfs2_holder gh;
1989 int error;
1990
1991 gfs2_holder_mark_uninitialized(&gh);
1992 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1993 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1994 if (error)
1995 return error;
1996 }
1997
1998 generic_fillattr(inode, stat);
1999 if (gfs2_holder_initialized(&gh))
2000 gfs2_glock_dq_uninit(&gh);
2001
2002 return 0;
2003 }
2004
gfs2_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len)2005 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2006 u64 start, u64 len)
2007 {
2008 struct gfs2_inode *ip = GFS2_I(inode);
2009 struct gfs2_holder gh;
2010 int ret;
2011
2012 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2013 if (ret)
2014 return ret;
2015
2016 inode_lock(inode);
2017
2018 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2019 if (ret)
2020 goto out;
2021
2022 if (gfs2_is_stuffed(ip)) {
2023 u64 phys = ip->i_no_addr << inode->i_blkbits;
2024 u64 size = i_size_read(inode);
2025 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2026 FIEMAP_EXTENT_DATA_INLINE;
2027 phys += sizeof(struct gfs2_dinode);
2028 phys += start;
2029 if (start + len > size)
2030 len = size - start;
2031 if (start < size)
2032 ret = fiemap_fill_next_extent(fieinfo, start, phys,
2033 len, flags);
2034 if (ret == 1)
2035 ret = 0;
2036 } else {
2037 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2038 gfs2_block_map);
2039 }
2040
2041 gfs2_glock_dq_uninit(&gh);
2042 out:
2043 inode_unlock(inode);
2044 return ret;
2045 }
2046
2047 const struct inode_operations gfs2_file_iops = {
2048 .permission = gfs2_permission,
2049 .setattr = gfs2_setattr,
2050 .getattr = gfs2_getattr,
2051 .listxattr = gfs2_listxattr,
2052 .fiemap = gfs2_fiemap,
2053 .get_acl = gfs2_get_acl,
2054 .set_acl = gfs2_set_acl,
2055 };
2056
2057 const struct inode_operations gfs2_dir_iops = {
2058 .create = gfs2_create,
2059 .lookup = gfs2_lookup,
2060 .link = gfs2_link,
2061 .unlink = gfs2_unlink,
2062 .symlink = gfs2_symlink,
2063 .mkdir = gfs2_mkdir,
2064 .rmdir = gfs2_unlink,
2065 .mknod = gfs2_mknod,
2066 .rename = gfs2_rename2,
2067 .permission = gfs2_permission,
2068 .setattr = gfs2_setattr,
2069 .getattr = gfs2_getattr,
2070 .listxattr = gfs2_listxattr,
2071 .fiemap = gfs2_fiemap,
2072 .get_acl = gfs2_get_acl,
2073 .set_acl = gfs2_set_acl,
2074 .atomic_open = gfs2_atomic_open,
2075 };
2076
2077 const struct inode_operations gfs2_symlink_iops = {
2078 .get_link = gfs2_get_link,
2079 .permission = gfs2_permission,
2080 .setattr = gfs2_setattr,
2081 .getattr = gfs2_getattr,
2082 .listxattr = gfs2_listxattr,
2083 .fiemap = gfs2_fiemap,
2084 };
2085
2086