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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
b3b94faa DT |
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> | |
b3b94faa DT |
15 | #include <linux/mm.h> |
16 | #include <linux/xattr.h> | |
17 | #include <linux/posix_acl.h> | |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 19 | #include <linux/crc32.h> |
e9079cce | 20 | #include <linux/fiemap.h> |
194c011f | 21 | #include <linux/security.h> |
b3b94faa DT |
22 | #include <asm/uaccess.h> |
23 | ||
24 | #include "gfs2.h" | |
5c676f6d | 25 | #include "incore.h" |
b3b94faa DT |
26 | #include "acl.h" |
27 | #include "bmap.h" | |
28 | #include "dir.h" | |
307cf6e6 | 29 | #include "xattr.h" |
b3b94faa DT |
30 | #include "glock.h" |
31 | #include "inode.h" | |
32 | #include "meta_io.h" | |
b3b94faa DT |
33 | #include "quota.h" |
34 | #include "rgrp.h" | |
35 | #include "trans.h" | |
5c676f6d | 36 | #include "util.h" |
b2760583 | 37 | #include "super.h" |
194c011f SW |
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_gl->gl_object = NULL; | |
193 | gfs2_glock_dq_uninit(&ip->i_iopen_gh); | |
194 | fail_iopen: | |
195 | if (io_gl) | |
196 | gfs2_glock_put(io_gl); | |
197 | fail_put: | |
198 | ip->i_gl->gl_object = NULL; | |
199 | gfs2_glock_put(ip->i_gl); | |
200 | fail: | |
201 | iget_failed(inode); | |
202 | return ERR_PTR(error); | |
203 | } | |
204 | ||
205 | struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, | |
206 | u64 *no_formal_ino, unsigned int blktype) | |
207 | { | |
208 | struct super_block *sb = sdp->sd_vfs; | |
209 | struct gfs2_holder i_gh; | |
210 | struct inode *inode = NULL; | |
211 | int error; | |
212 | ||
213 | /* Must not read in block until block type is verified */ | |
214 | error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, | |
215 | LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); | |
216 | if (error) | |
217 | return ERR_PTR(error); | |
218 | ||
219 | error = gfs2_check_blk_type(sdp, no_addr, blktype); | |
220 | if (error) | |
221 | goto fail; | |
222 | ||
223 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); | |
224 | if (IS_ERR(inode)) | |
225 | goto fail; | |
226 | ||
227 | /* Two extra checks for NFS only */ | |
228 | if (no_formal_ino) { | |
229 | error = -ESTALE; | |
230 | if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) | |
231 | goto fail_iput; | |
232 | ||
233 | error = -EIO; | |
234 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) | |
235 | goto fail_iput; | |
236 | ||
237 | error = 0; | |
238 | } | |
239 | ||
240 | fail: | |
241 | gfs2_glock_dq_uninit(&i_gh); | |
242 | return error ? ERR_PTR(error) : inode; | |
243 | fail_iput: | |
244 | iput(inode); | |
245 | goto fail; | |
246 | } | |
247 | ||
248 | ||
249 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) | |
250 | { | |
251 | struct qstr qstr; | |
252 | struct inode *inode; | |
253 | gfs2_str2qstr(&qstr, name); | |
254 | inode = gfs2_lookupi(dip, &qstr, 1); | |
255 | /* gfs2_lookupi has inconsistent callers: vfs | |
256 | * related routines expect NULL for no entry found, | |
257 | * gfs2_lookup_simple callers expect ENOENT | |
258 | * and do not check for NULL. | |
259 | */ | |
260 | if (inode == NULL) | |
261 | return ERR_PTR(-ENOENT); | |
262 | else | |
263 | return inode; | |
264 | } | |
265 | ||
266 | ||
267 | /** | |
268 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
269 | * @d_gh: An initialized holder for the directory glock | |
270 | * @name: The name of the inode to look for | |
271 | * @is_root: If 1, ignore the caller's permissions | |
272 | * @i_gh: An uninitialized holder for the new inode glock | |
273 | * | |
274 | * This can be called via the VFS filldir function when NFS is doing | |
275 | * a readdirplus and the inode which its intending to stat isn't | |
276 | * already in cache. In this case we must not take the directory glock | |
277 | * again, since the readdir call will have already taken that lock. | |
278 | * | |
279 | * Returns: errno | |
280 | */ | |
281 | ||
282 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, | |
283 | int is_root) | |
284 | { | |
285 | struct super_block *sb = dir->i_sb; | |
286 | struct gfs2_inode *dip = GFS2_I(dir); | |
287 | struct gfs2_holder d_gh; | |
288 | int error = 0; | |
289 | struct inode *inode = NULL; | |
290 | int unlock = 0; | |
291 | ||
292 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
293 | return ERR_PTR(-ENAMETOOLONG); | |
294 | ||
295 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || | |
296 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
297 | dir == sb->s_root->d_inode)) { | |
298 | igrab(dir); | |
299 | return dir; | |
300 | } | |
301 | ||
302 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { | |
303 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
304 | if (error) | |
305 | return ERR_PTR(error); | |
306 | unlock = 1; | |
307 | } | |
308 | ||
309 | if (!is_root) { | |
310 | error = gfs2_permission(dir, MAY_EXEC, 0); | |
311 | if (error) | |
312 | goto out; | |
313 | } | |
314 | ||
315 | inode = gfs2_dir_search(dir, name); | |
316 | if (IS_ERR(inode)) | |
317 | error = PTR_ERR(inode); | |
318 | out: | |
319 | if (unlock) | |
320 | gfs2_glock_dq_uninit(&d_gh); | |
321 | if (error == -ENOENT) | |
322 | return NULL; | |
323 | return inode ? inode : ERR_PTR(error); | |
324 | } | |
325 | ||
326 | /** | |
327 | * create_ok - OK to create a new on-disk inode here? | |
328 | * @dip: Directory in which dinode is to be created | |
329 | * @name: Name of new dinode | |
330 | * @mode: | |
331 | * | |
332 | * Returns: errno | |
333 | */ | |
334 | ||
335 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, | |
336 | unsigned int mode) | |
337 | { | |
338 | int error; | |
339 | ||
340 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); | |
341 | if (error) | |
342 | return error; | |
343 | ||
344 | /* Don't create entries in an unlinked directory */ | |
345 | if (!dip->i_inode.i_nlink) | |
346 | return -ENOENT; | |
347 | ||
348 | error = gfs2_dir_check(&dip->i_inode, name, NULL); | |
349 | switch (error) { | |
350 | case -ENOENT: | |
351 | error = 0; | |
352 | break; | |
353 | case 0: | |
354 | return -EEXIST; | |
355 | default: | |
356 | return error; | |
357 | } | |
358 | ||
359 | if (dip->i_entries == (u32)-1) | |
360 | return -EFBIG; | |
361 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) | |
362 | return -EMLINK; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
368 | unsigned int *uid, unsigned int *gid) | |
369 | { | |
370 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && | |
371 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { | |
372 | if (S_ISDIR(*mode)) | |
373 | *mode |= S_ISUID; | |
374 | else if (dip->i_inode.i_uid != current_fsuid()) | |
375 | *mode &= ~07111; | |
376 | *uid = dip->i_inode.i_uid; | |
377 | } else | |
378 | *uid = current_fsuid(); | |
379 | ||
380 | if (dip->i_inode.i_mode & S_ISGID) { | |
381 | if (S_ISDIR(*mode)) | |
382 | *mode |= S_ISGID; | |
383 | *gid = dip->i_inode.i_gid; | |
384 | } else | |
385 | *gid = current_fsgid(); | |
386 | } | |
387 | ||
388 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) | |
389 | { | |
390 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
391 | int error; | |
392 | ||
393 | if (gfs2_alloc_get(dip) == NULL) | |
394 | return -ENOMEM; | |
395 | ||
396 | dip->i_alloc->al_requested = RES_DINODE; | |
397 | error = gfs2_inplace_reserve(dip); | |
398 | if (error) | |
399 | goto out; | |
400 | ||
401 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); | |
402 | if (error) | |
403 | goto out_ipreserv; | |
404 | ||
405 | error = gfs2_alloc_di(dip, no_addr, generation); | |
406 | ||
407 | gfs2_trans_end(sdp); | |
408 | ||
409 | out_ipreserv: | |
410 | gfs2_inplace_release(dip); | |
411 | out: | |
412 | gfs2_alloc_put(dip); | |
413 | return error; | |
414 | } | |
415 | ||
416 | /** | |
417 | * init_dinode - Fill in a new dinode structure | |
418 | * @dip: the directory this inode is being created in | |
419 | * @gl: The glock covering the new inode | |
420 | * @inum: the inode number | |
421 | * @mode: the file permissions | |
422 | * @uid: | |
423 | * @gid: | |
424 | * | |
425 | */ | |
426 | ||
427 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
428 | const struct gfs2_inum_host *inum, unsigned int mode, | |
429 | unsigned int uid, unsigned int gid, | |
430 | const u64 *generation, dev_t dev, struct buffer_head **bhp) | |
431 | { | |
432 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
433 | struct gfs2_dinode *di; | |
434 | struct buffer_head *dibh; | |
435 | struct timespec tv = CURRENT_TIME; | |
436 | ||
437 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
438 | gfs2_trans_add_bh(gl, dibh, 1); | |
439 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); | |
440 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
441 | di = (struct gfs2_dinode *)dibh->b_data; | |
442 | ||
443 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); | |
444 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
445 | di->di_mode = cpu_to_be32(mode); | |
446 | di->di_uid = cpu_to_be32(uid); | |
447 | di->di_gid = cpu_to_be32(gid); | |
448 | di->di_nlink = 0; | |
449 | di->di_size = 0; | |
450 | di->di_blocks = cpu_to_be64(1); | |
451 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); | |
452 | di->di_major = cpu_to_be32(MAJOR(dev)); | |
453 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
454 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
455 | di->di_generation = cpu_to_be64(*generation); | |
456 | di->di_flags = 0; | |
457 | ||
458 | if (S_ISREG(mode)) { | |
459 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || | |
460 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
461 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); | |
462 | } else if (S_ISDIR(mode)) { | |
463 | di->di_flags |= cpu_to_be32(dip->i_diskflags & | |
464 | GFS2_DIF_INHERIT_JDATA); | |
465 | } | |
466 | ||
467 | di->__pad1 = 0; | |
468 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); | |
469 | di->di_height = 0; | |
470 | di->__pad2 = 0; | |
471 | di->__pad3 = 0; | |
472 | di->di_depth = 0; | |
473 | di->di_entries = 0; | |
474 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
475 | di->di_eattr = 0; | |
476 | di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); | |
477 | di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); | |
478 | di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); | |
479 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
480 | ||
481 | set_buffer_uptodate(dibh); | |
482 | ||
483 | *bhp = dibh; | |
484 | } | |
485 | ||
486 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
487 | unsigned int mode, const struct gfs2_inum_host *inum, | |
488 | const u64 *generation, dev_t dev, struct buffer_head **bhp) | |
489 | { | |
490 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
491 | unsigned int uid, gid; | |
492 | int error; | |
493 | ||
494 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
495 | if (!gfs2_alloc_get(dip)) | |
496 | return -ENOMEM; | |
497 | ||
498 | error = gfs2_quota_lock(dip, uid, gid); | |
499 | if (error) | |
500 | goto out; | |
501 | ||
502 | error = gfs2_quota_check(dip, uid, gid); | |
503 | if (error) | |
504 | goto out_quota; | |
505 | ||
506 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); | |
507 | if (error) | |
508 | goto out_quota; | |
509 | ||
510 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp); | |
511 | gfs2_quota_change(dip, +1, uid, gid); | |
512 | gfs2_trans_end(sdp); | |
513 | ||
514 | out_quota: | |
515 | gfs2_quota_unlock(dip); | |
516 | out: | |
517 | gfs2_alloc_put(dip); | |
518 | return error; | |
519 | } | |
520 | ||
521 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, | |
522 | struct gfs2_inode *ip) | |
523 | { | |
524 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
525 | struct gfs2_alloc *al; | |
526 | int alloc_required; | |
527 | struct buffer_head *dibh; | |
528 | int error; | |
529 | ||
530 | al = gfs2_alloc_get(dip); | |
531 | if (!al) | |
532 | return -ENOMEM; | |
533 | ||
534 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
535 | if (error) | |
536 | goto fail; | |
537 | ||
538 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); | |
539 | if (alloc_required < 0) | |
540 | goto fail_quota_locks; | |
541 | if (alloc_required) { | |
542 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); | |
543 | if (error) | |
544 | goto fail_quota_locks; | |
545 | ||
546 | al->al_requested = sdp->sd_max_dirres; | |
547 | ||
548 | error = gfs2_inplace_reserve(dip); | |
549 | if (error) | |
550 | goto fail_quota_locks; | |
551 | ||
552 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + | |
553 | al->al_rgd->rd_length + | |
554 | 2 * RES_DINODE + | |
555 | RES_STATFS + RES_QUOTA, 0); | |
556 | if (error) | |
557 | goto fail_ipreserv; | |
558 | } else { | |
559 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
560 | if (error) | |
561 | goto fail_quota_locks; | |
562 | } | |
563 | ||
564 | error = gfs2_dir_add(&dip->i_inode, name, ip); | |
565 | if (error) | |
566 | goto fail_end_trans; | |
567 | ||
568 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
569 | if (error) | |
570 | goto fail_end_trans; | |
571 | ip->i_inode.i_nlink = 1; | |
572 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
573 | gfs2_dinode_out(ip, dibh->b_data); | |
574 | brelse(dibh); | |
575 | return 0; | |
576 | ||
577 | fail_end_trans: | |
578 | gfs2_trans_end(sdp); | |
579 | ||
580 | fail_ipreserv: | |
581 | if (dip->i_alloc->al_rgd) | |
582 | gfs2_inplace_release(dip); | |
583 | ||
584 | fail_quota_locks: | |
585 | gfs2_quota_unlock(dip); | |
586 | ||
587 | fail: | |
588 | gfs2_alloc_put(dip); | |
589 | return error; | |
590 | } | |
591 | ||
592 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, | |
593 | const struct qstr *qstr) | |
594 | { | |
595 | int err; | |
596 | size_t len; | |
597 | void *value; | |
598 | char *name; | |
599 | ||
600 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, | |
601 | &name, &value, &len); | |
602 | ||
603 | if (err) { | |
604 | if (err == -EOPNOTSUPP) | |
605 | return 0; | |
606 | return err; | |
607 | } | |
608 | ||
609 | err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0, | |
610 | GFS2_EATYPE_SECURITY); | |
611 | kfree(value); | |
612 | kfree(name); | |
613 | ||
614 | return err; | |
615 | } | |
b3b94faa | 616 | |
194c011f SW |
617 | /** |
618 | * gfs2_createi - Create a new inode | |
619 | * @ghs: An array of two holders | |
620 | * @name: The name of the new file | |
621 | * @mode: the permissions on the new inode | |
622 | * | |
623 | * @ghs[0] is an initialized holder for the directory | |
624 | * @ghs[1] is the holder for the inode lock | |
625 | * | |
626 | * If the return value is not NULL, the glocks on both the directory and the new | |
627 | * file are held. A transaction has been started and an inplace reservation | |
628 | * is held, as well. | |
629 | * | |
630 | * Returns: An inode | |
631 | */ | |
632 | ||
633 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, | |
634 | unsigned int mode, dev_t dev) | |
635 | { | |
636 | struct inode *inode = NULL; | |
637 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; | |
638 | struct inode *dir = &dip->i_inode; | |
639 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
640 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; | |
641 | int error; | |
642 | u64 generation; | |
643 | struct buffer_head *bh = NULL; | |
644 | ||
645 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
646 | return ERR_PTR(-ENAMETOOLONG); | |
647 | ||
648 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
649 | error = gfs2_glock_nq(ghs); | |
650 | if (error) | |
651 | goto fail; | |
652 | ||
653 | error = create_ok(dip, name, mode); | |
654 | if (error) | |
655 | goto fail_gunlock; | |
656 | ||
657 | error = alloc_dinode(dip, &inum.no_addr, &generation); | |
658 | if (error) | |
659 | goto fail_gunlock; | |
660 | inum.no_formal_ino = generation; | |
661 | ||
662 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, | |
663 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
664 | if (error) | |
665 | goto fail_gunlock; | |
666 | ||
667 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh); | |
668 | if (error) | |
669 | goto fail_gunlock2; | |
670 | ||
671 | inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, | |
672 | inum.no_formal_ino, 0); | |
673 | if (IS_ERR(inode)) | |
674 | goto fail_gunlock2; | |
675 | ||
676 | error = gfs2_inode_refresh(GFS2_I(inode)); | |
677 | if (error) | |
678 | goto fail_gunlock2; | |
679 | ||
680 | error = gfs2_acl_create(dip, inode); | |
681 | if (error) | |
682 | goto fail_gunlock2; | |
683 | ||
684 | error = gfs2_security_init(dip, GFS2_I(inode), name); | |
685 | if (error) | |
686 | goto fail_gunlock2; | |
687 | ||
688 | error = link_dinode(dip, name, GFS2_I(inode)); | |
689 | if (error) | |
690 | goto fail_gunlock2; | |
691 | ||
692 | if (bh) | |
693 | brelse(bh); | |
694 | return inode; | |
695 | ||
696 | fail_gunlock2: | |
697 | gfs2_glock_dq_uninit(ghs + 1); | |
698 | if (inode && !IS_ERR(inode)) | |
699 | iput(inode); | |
700 | fail_gunlock: | |
701 | gfs2_glock_dq(ghs); | |
702 | fail: | |
703 | if (bh) | |
704 | brelse(bh); | |
705 | return ERR_PTR(error); | |
706 | } | |
b3b94faa DT |
707 | /** |
708 | * gfs2_create - Create a file | |
709 | * @dir: The directory in which to create the file | |
710 | * @dentry: The dentry of the new file | |
711 | * @mode: The mode of the new file | |
712 | * | |
713 | * Returns: errno | |
714 | */ | |
715 | ||
716 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
717 | int mode, struct nameidata *nd) | |
718 | { | |
feaa7bba SW |
719 | struct gfs2_inode *dip = GFS2_I(dir); |
720 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
721 | struct gfs2_holder ghs[2]; |
722 | struct inode *inode; | |
b3b94faa | 723 | |
b3b94faa DT |
724 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
725 | ||
726 | for (;;) { | |
e7f14f4d | 727 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); |
7359a19c | 728 | if (!IS_ERR(inode)) { |
b3b94faa | 729 | gfs2_trans_end(sdp); |
6dbd8224 | 730 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
731 | gfs2_inplace_release(dip); |
732 | gfs2_quota_unlock(dip); | |
733 | gfs2_alloc_put(dip); | |
734 | gfs2_glock_dq_uninit_m(2, ghs); | |
3a8476dd | 735 | mark_inode_dirty(inode); |
b3b94faa | 736 | break; |
7359a19c | 737 | } else if (PTR_ERR(inode) != -EEXIST || |
3516586a | 738 | (nd && nd->flags & LOOKUP_EXCL)) { |
b3b94faa | 739 | gfs2_holder_uninit(ghs); |
7359a19c | 740 | return PTR_ERR(inode); |
b3b94faa DT |
741 | } |
742 | ||
a569c711 | 743 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c SW |
744 | if (inode) { |
745 | if (!IS_ERR(inode)) { | |
c752666c SW |
746 | gfs2_holder_uninit(ghs); |
747 | break; | |
748 | } else { | |
749 | gfs2_holder_uninit(ghs); | |
750 | return PTR_ERR(inode); | |
751 | } | |
b3b94faa DT |
752 | } |
753 | } | |
754 | ||
b3b94faa | 755 | d_instantiate(dentry, inode); |
b3b94faa DT |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
760 | /** | |
761 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
762 | * @dir: The directory inode | |
763 | * @dentry: The dentry of the new inode | |
764 | * @nd: passed from Linux VFS, ignored by us | |
765 | * | |
766 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
767 | * | |
768 | * Returns: errno | |
769 | */ | |
770 | ||
771 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
772 | struct nameidata *nd) | |
773 | { | |
b3b94faa | 774 | struct inode *inode = NULL; |
b3b94faa | 775 | |
a569c711 | 776 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c | 777 | if (inode && IS_ERR(inode)) |
e231c2ee | 778 | return ERR_CAST(inode); |
b3b94faa | 779 | |
9656b2c1 SW |
780 | if (inode) { |
781 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
782 | struct gfs2_holder gh; | |
783 | int error; | |
784 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
785 | if (error) { | |
786 | iput(inode); | |
787 | return ERR_PTR(error); | |
788 | } | |
789 | gfs2_glock_dq_uninit(&gh); | |
b3b94faa | 790 | return d_splice_alias(inode, dentry); |
9656b2c1 | 791 | } |
b3b94faa DT |
792 | d_add(dentry, inode); |
793 | ||
794 | return NULL; | |
795 | } | |
796 | ||
797 | /** | |
798 | * gfs2_link - Link to a file | |
799 | * @old_dentry: The inode to link | |
800 | * @dir: Add link to this directory | |
801 | * @dentry: The name of the link | |
802 | * | |
803 | * Link the inode in "old_dentry" into the directory "dir" with the | |
804 | * name in "dentry". | |
805 | * | |
806 | * Returns: errno | |
807 | */ | |
808 | ||
809 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
810 | struct dentry *dentry) | |
811 | { | |
feaa7bba SW |
812 | struct gfs2_inode *dip = GFS2_I(dir); |
813 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 814 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 815 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 816 | struct gfs2_holder ghs[2]; |
2baee03f | 817 | struct buffer_head *dibh; |
b3b94faa DT |
818 | int alloc_required; |
819 | int error; | |
820 | ||
b60623c2 | 821 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
822 | return -EPERM; |
823 | ||
824 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); | |
825 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
826 | ||
72dbf479 BP |
827 | error = gfs2_glock_nq(ghs); /* parent */ |
828 | if (error) | |
829 | goto out_parent; | |
830 | ||
831 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 832 | if (error) |
72dbf479 | 833 | goto out_child; |
b3b94faa | 834 | |
d192a8e5 SW |
835 | error = -ENOENT; |
836 | if (inode->i_nlink == 0) | |
837 | goto out_gunlock; | |
838 | ||
b74c79e9 | 839 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0); |
b3b94faa DT |
840 | if (error) |
841 | goto out_gunlock; | |
842 | ||
dbb7cae2 | 843 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
844 | switch (error) { |
845 | case -ENOENT: | |
846 | break; | |
847 | case 0: | |
848 | error = -EEXIST; | |
849 | default: | |
850 | goto out_gunlock; | |
851 | } | |
852 | ||
853 | error = -EINVAL; | |
4f56110a | 854 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
855 | goto out_gunlock; |
856 | error = -EFBIG; | |
ad6203f2 | 857 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
858 | goto out_gunlock; |
859 | error = -EPERM; | |
860 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
861 | goto out_gunlock; | |
862 | error = -EINVAL; | |
4f56110a | 863 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
864 | goto out_gunlock; |
865 | error = -EMLINK; | |
4f56110a | 866 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
867 | goto out_gunlock; |
868 | ||
c752666c SW |
869 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
870 | if (error < 0) | |
b3b94faa | 871 | goto out_gunlock; |
c752666c | 872 | error = 0; |
b3b94faa DT |
873 | |
874 | if (alloc_required) { | |
875 | struct gfs2_alloc *al = gfs2_alloc_get(dip); | |
182fe5ab CG |
876 | if (!al) { |
877 | error = -ENOMEM; | |
878 | goto out_gunlock; | |
879 | } | |
b3b94faa | 880 | |
d82661d9 | 881 | error = gfs2_quota_lock_check(dip); |
b3b94faa DT |
882 | if (error) |
883 | goto out_alloc; | |
884 | ||
b3b94faa DT |
885 | al->al_requested = sdp->sd_max_dirres; |
886 | ||
887 | error = gfs2_inplace_reserve(dip); | |
888 | if (error) | |
889 | goto out_gunlock_q; | |
890 | ||
1b50259b | 891 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bf97b673 | 892 | gfs2_rg_blocks(al) + |
b3b94faa DT |
893 | 2 * RES_DINODE + RES_STATFS + |
894 | RES_QUOTA, 0); | |
895 | if (error) | |
896 | goto out_ipres; | |
897 | } else { | |
898 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
899 | if (error) | |
900 | goto out_ipres; | |
901 | } | |
902 | ||
2baee03f | 903 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
904 | if (error) |
905 | goto out_end_trans; | |
906 | ||
3d6ecb7d | 907 | error = gfs2_dir_add(dir, &dentry->d_name, ip); |
2baee03f SW |
908 | if (error) |
909 | goto out_brelse; | |
910 | ||
911 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
912 | inc_nlink(&ip->i_inode); | |
913 | ip->i_inode.i_ctime = CURRENT_TIME; | |
914 | gfs2_dinode_out(ip, dibh->b_data); | |
915 | mark_inode_dirty(&ip->i_inode); | |
b3b94faa | 916 | |
2baee03f SW |
917 | out_brelse: |
918 | brelse(dibh); | |
feaa7bba | 919 | out_end_trans: |
b3b94faa | 920 | gfs2_trans_end(sdp); |
feaa7bba | 921 | out_ipres: |
b3b94faa DT |
922 | if (alloc_required) |
923 | gfs2_inplace_release(dip); | |
feaa7bba | 924 | out_gunlock_q: |
b3b94faa DT |
925 | if (alloc_required) |
926 | gfs2_quota_unlock(dip); | |
feaa7bba | 927 | out_alloc: |
b3b94faa DT |
928 | if (alloc_required) |
929 | gfs2_alloc_put(dip); | |
feaa7bba | 930 | out_gunlock: |
72dbf479 BP |
931 | gfs2_glock_dq(ghs + 1); |
932 | out_child: | |
933 | gfs2_glock_dq(ghs); | |
934 | out_parent: | |
b3b94faa DT |
935 | gfs2_holder_uninit(ghs); |
936 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa | 937 | if (!error) { |
7de9c6ee | 938 | ihold(inode); |
b3b94faa DT |
939 | d_instantiate(dentry, inode); |
940 | mark_inode_dirty(inode); | |
941 | } | |
b3b94faa DT |
942 | return error; |
943 | } | |
944 | ||
87ec2174 SW |
945 | /* |
946 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
947 | * @dip: the directory | |
948 | * @name: the name of the file | |
949 | * @ip: the inode | |
950 | * | |
951 | * Assumes that the lock on (at least) @dip is held. | |
952 | * | |
953 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
954 | */ | |
955 | ||
956 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
957 | const struct gfs2_inode *ip) | |
958 | { | |
959 | int error; | |
960 | ||
961 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
962 | return -EPERM; | |
963 | ||
964 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
965 | dip->i_inode.i_uid != current_fsuid() && | |
966 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) | |
967 | return -EPERM; | |
968 | ||
969 | if (IS_APPEND(&dip->i_inode)) | |
970 | return -EPERM; | |
971 | ||
b74c79e9 | 972 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); |
87ec2174 SW |
973 | if (error) |
974 | return error; | |
975 | ||
976 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
977 | if (error) | |
978 | return error; | |
979 | ||
980 | return 0; | |
981 | } | |
982 | ||
b3b94faa | 983 | /** |
855d23ce SW |
984 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
985 | * @dip: The parent directory | |
986 | * @name: The name of the entry in the parent directory | |
987 | * @bh: The inode buffer for the inode to be removed | |
988 | * @inode: The inode to be removed | |
989 | * | |
990 | * Called with all the locks and in a transaction. This will only be | |
991 | * called for a directory after it has been checked to ensure it is empty. | |
992 | * | |
993 | * Returns: 0 on success, or an error | |
994 | */ | |
995 | ||
996 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
997 | const struct dentry *dentry, | |
998 | struct buffer_head *bh) | |
999 | { | |
1000 | struct inode *inode = dentry->d_inode; | |
1001 | struct gfs2_inode *ip = GFS2_I(inode); | |
1002 | int error; | |
1003 | ||
1004 | error = gfs2_dir_del(dip, dentry); | |
1005 | if (error) | |
1006 | return error; | |
1007 | ||
1008 | ip->i_entries = 0; | |
1009 | inode->i_ctime = CURRENT_TIME; | |
1010 | if (S_ISDIR(inode->i_mode)) | |
1011 | clear_nlink(inode); | |
1012 | else | |
1013 | drop_nlink(inode); | |
1014 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
1015 | gfs2_dinode_out(ip, bh->b_data); | |
1016 | mark_inode_dirty(inode); | |
1017 | if (inode->i_nlink == 0) | |
1018 | gfs2_unlink_di(inode); | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | ||
1023 | /** | |
1024 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1025 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1026 | * @dentry: The file itself |
1027 | * | |
855d23ce SW |
1028 | * This routine uses the type of the inode as a flag to figure out |
1029 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1030 | * |
1031 | * Returns: errno | |
1032 | */ | |
1033 | ||
1034 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1035 | { | |
feaa7bba SW |
1036 | struct gfs2_inode *dip = GFS2_I(dir); |
1037 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1038 | struct inode *inode = dentry->d_inode; |
1039 | struct gfs2_inode *ip = GFS2_I(inode); | |
1040 | struct buffer_head *bh; | |
ddee7608 RC |
1041 | struct gfs2_holder ghs[3]; |
1042 | struct gfs2_rgrpd *rgd; | |
1043 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
1044 | int error; |
1045 | ||
ddee7608 RC |
1046 | error = gfs2_rindex_hold(sdp, &ri_gh); |
1047 | if (error) | |
1048 | return error; | |
1049 | ||
b3b94faa | 1050 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1051 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1052 | |
dbb7cae2 | 1053 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
1054 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1055 | ||
1056 | ||
8497a46e | 1057 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1058 | if (error) |
8497a46e SW |
1059 | goto out_parent; |
1060 | ||
1061 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1062 | if (error) | |
1063 | goto out_child; | |
1064 | ||
d192a8e5 | 1065 | error = -ENOENT; |
855d23ce | 1066 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1067 | goto out_rgrp; |
1068 | ||
855d23ce SW |
1069 | if (S_ISDIR(inode->i_mode)) { |
1070 | error = -ENOTEMPTY; | |
1071 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1072 | goto out_rgrp; | |
1073 | } | |
1074 | ||
8497a46e SW |
1075 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1076 | if (error) | |
1077 | goto out_rgrp; | |
b3b94faa DT |
1078 | |
1079 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1080 | if (error) | |
72dbf479 | 1081 | goto out_gunlock; |
b3b94faa | 1082 | |
855d23ce | 1083 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
b3b94faa | 1084 | if (error) |
cd012075 | 1085 | goto out_gunlock; |
b3b94faa | 1086 | |
855d23ce SW |
1087 | error = gfs2_meta_inode_buffer(ip, &bh); |
1088 | if (error) | |
1089 | goto out_end_trans; | |
b3b94faa | 1090 | |
855d23ce SW |
1091 | error = gfs2_unlink_inode(dip, dentry, bh); |
1092 | brelse(bh); | |
b3b94faa | 1093 | |
feaa7bba SW |
1094 | out_end_trans: |
1095 | gfs2_trans_end(sdp); | |
72dbf479 | 1096 | out_gunlock: |
8497a46e SW |
1097 | gfs2_glock_dq(ghs + 2); |
1098 | out_rgrp: | |
ddee7608 | 1099 | gfs2_holder_uninit(ghs + 2); |
8497a46e SW |
1100 | gfs2_glock_dq(ghs + 1); |
1101 | out_child: | |
1102 | gfs2_holder_uninit(ghs + 1); | |
1103 | gfs2_glock_dq(ghs); | |
1104 | out_parent: | |
1105 | gfs2_holder_uninit(ghs); | |
ddee7608 | 1106 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
1107 | return error; |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * gfs2_symlink - Create a symlink | |
1112 | * @dir: The directory to create the symlink in | |
1113 | * @dentry: The dentry to put the symlink in | |
1114 | * @symname: The thing which the link points to | |
1115 | * | |
1116 | * Returns: errno | |
1117 | */ | |
1118 | ||
1119 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1120 | const char *symname) | |
1121 | { | |
feaa7bba SW |
1122 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
1123 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
1124 | struct gfs2_holder ghs[2]; |
1125 | struct inode *inode; | |
1126 | struct buffer_head *dibh; | |
1127 | int size; | |
1128 | int error; | |
1129 | ||
b3b94faa DT |
1130 | /* Must be stuffed with a null terminator for gfs2_follow_link() */ |
1131 | size = strlen(symname); | |
1132 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1133 | return -ENAMETOOLONG; | |
1134 | ||
1135 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
1136 | ||
e7f14f4d | 1137 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); |
7359a19c | 1138 | if (IS_ERR(inode)) { |
b3b94faa | 1139 | gfs2_holder_uninit(ghs); |
7359a19c | 1140 | return PTR_ERR(inode); |
b3b94faa DT |
1141 | } |
1142 | ||
5c676f6d | 1143 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 1144 | |
5cf32524 | 1145 | i_size_write(inode, size); |
b3b94faa DT |
1146 | |
1147 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1148 | ||
1149 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
539e5d6b | 1150 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1151 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, |
1152 | size); | |
1153 | brelse(dibh); | |
1154 | } | |
1155 | ||
1156 | gfs2_trans_end(sdp); | |
6dbd8224 | 1157 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
1158 | gfs2_inplace_release(dip); |
1159 | gfs2_quota_unlock(dip); | |
1160 | gfs2_alloc_put(dip); | |
1161 | ||
1162 | gfs2_glock_dq_uninit_m(2, ghs); | |
1163 | ||
b3b94faa DT |
1164 | d_instantiate(dentry, inode); |
1165 | mark_inode_dirty(inode); | |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | /** | |
1171 | * gfs2_mkdir - Make a directory | |
1172 | * @dir: The parent directory of the new one | |
1173 | * @dentry: The dentry of the new directory | |
1174 | * @mode: The mode of the new directory | |
1175 | * | |
1176 | * Returns: errno | |
1177 | */ | |
1178 | ||
1179 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1180 | { | |
feaa7bba SW |
1181 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
1182 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
1183 | struct gfs2_holder ghs[2]; |
1184 | struct inode *inode; | |
1185 | struct buffer_head *dibh; | |
1186 | int error; | |
1187 | ||
b3b94faa DT |
1188 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
1189 | ||
e7f14f4d | 1190 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); |
7359a19c | 1191 | if (IS_ERR(inode)) { |
b3b94faa | 1192 | gfs2_holder_uninit(ghs); |
7359a19c | 1193 | return PTR_ERR(inode); |
b3b94faa DT |
1194 | } |
1195 | ||
5c676f6d | 1196 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 1197 | |
4f56110a | 1198 | ip->i_inode.i_nlink = 2; |
a2e0f799 | 1199 | i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); |
383f01fb | 1200 | ip->i_diskflags |= GFS2_DIF_JDATA; |
ad6203f2 | 1201 | ip->i_entries = 2; |
b3b94faa DT |
1202 | |
1203 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1204 | ||
1205 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
1206 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
c752666c | 1207 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); |
b3b94faa | 1208 | |
c752666c | 1209 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
8d123585 | 1210 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); |
b3b94faa | 1211 | dent->de_inum = di->di_num; /* already GFS2 endian */ |
7ecdb70a | 1212 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa DT |
1213 | di->di_entries = cpu_to_be32(1); |
1214 | ||
c752666c | 1215 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); |
8d123585 | 1216 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); |
b3b94faa | 1217 | |
dbb7cae2 | 1218 | gfs2_inum_out(dip, dent); |
7ecdb70a | 1219 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa | 1220 | |
539e5d6b | 1221 | gfs2_dinode_out(ip, di); |
b3b94faa DT |
1222 | |
1223 | brelse(dibh); | |
1224 | } | |
1225 | ||
b3b94faa | 1226 | gfs2_trans_end(sdp); |
6dbd8224 | 1227 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
1228 | gfs2_inplace_release(dip); |
1229 | gfs2_quota_unlock(dip); | |
1230 | gfs2_alloc_put(dip); | |
1231 | ||
1232 | gfs2_glock_dq_uninit_m(2, ghs); | |
1233 | ||
b3b94faa DT |
1234 | d_instantiate(dentry, inode); |
1235 | mark_inode_dirty(inode); | |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
b3b94faa DT |
1240 | /** |
1241 | * gfs2_mknod - Make a special file | |
1242 | * @dir: The directory in which the special file will reside | |
1243 | * @dentry: The dentry of the special file | |
1244 | * @mode: The mode of the special file | |
1245 | * @rdev: The device specification of the special file | |
1246 | * | |
1247 | */ | |
1248 | ||
1249 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
1250 | dev_t dev) | |
1251 | { | |
e7f14f4d | 1252 | struct gfs2_inode *dip = GFS2_I(dir); |
feaa7bba | 1253 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
b3b94faa DT |
1254 | struct gfs2_holder ghs[2]; |
1255 | struct inode *inode; | |
b3b94faa DT |
1256 | |
1257 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
1258 | ||
e7f14f4d | 1259 | inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); |
7359a19c | 1260 | if (IS_ERR(inode)) { |
b3b94faa | 1261 | gfs2_holder_uninit(ghs); |
7359a19c | 1262 | return PTR_ERR(inode); |
b3b94faa DT |
1263 | } |
1264 | ||
b3b94faa | 1265 | gfs2_trans_end(sdp); |
6dbd8224 | 1266 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
1267 | gfs2_inplace_release(dip); |
1268 | gfs2_quota_unlock(dip); | |
1269 | gfs2_alloc_put(dip); | |
1270 | ||
1271 | gfs2_glock_dq_uninit_m(2, ghs); | |
1272 | ||
b3b94faa DT |
1273 | d_instantiate(dentry, inode); |
1274 | mark_inode_dirty(inode); | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
0188d6c5 SW |
1279 | /* |
1280 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1281 | * @this: move this | |
1282 | * @to: to here | |
1283 | * | |
1284 | * Follow @to back to the root and make sure we don't encounter @this | |
1285 | * Assumes we already hold the rename lock. | |
1286 | * | |
1287 | * Returns: errno | |
1288 | */ | |
1289 | ||
1290 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1291 | { | |
1292 | struct inode *dir = &to->i_inode; | |
1293 | struct super_block *sb = dir->i_sb; | |
1294 | struct inode *tmp; | |
0188d6c5 SW |
1295 | int error = 0; |
1296 | ||
0188d6c5 SW |
1297 | igrab(dir); |
1298 | ||
1299 | for (;;) { | |
1300 | if (dir == &this->i_inode) { | |
1301 | error = -EINVAL; | |
1302 | break; | |
1303 | } | |
1304 | if (dir == sb->s_root->d_inode) { | |
1305 | error = 0; | |
1306 | break; | |
1307 | } | |
1308 | ||
8d123585 | 1309 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
1310 | if (IS_ERR(tmp)) { |
1311 | error = PTR_ERR(tmp); | |
1312 | break; | |
1313 | } | |
1314 | ||
1315 | iput(dir); | |
1316 | dir = tmp; | |
1317 | } | |
1318 | ||
1319 | iput(dir); | |
1320 | ||
1321 | return error; | |
1322 | } | |
1323 | ||
b3b94faa DT |
1324 | /** |
1325 | * gfs2_rename - Rename a file | |
1326 | * @odir: Parent directory of old file name | |
1327 | * @odentry: The old dentry of the file | |
1328 | * @ndir: Parent directory of new file name | |
1329 | * @ndentry: The new dentry of the file | |
1330 | * | |
1331 | * Returns: errno | |
1332 | */ | |
1333 | ||
1334 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1335 | struct inode *ndir, struct dentry *ndentry) | |
1336 | { | |
feaa7bba SW |
1337 | struct gfs2_inode *odip = GFS2_I(odir); |
1338 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1339 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1340 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1341 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
46290341 | 1342 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; |
ddee7608 | 1343 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1344 | unsigned int num_gh; |
1345 | int dir_rename = 0; | |
24b977b5 | 1346 | int alloc_required = 0; |
b3b94faa DT |
1347 | unsigned int x; |
1348 | int error; | |
1349 | ||
b3b94faa | 1350 | if (ndentry->d_inode) { |
feaa7bba | 1351 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1352 | if (ip == nip) |
1353 | return 0; | |
1354 | } | |
1355 | ||
46290341 BP |
1356 | error = gfs2_rindex_hold(sdp, &ri_gh); |
1357 | if (error) | |
1358 | return error; | |
b3b94faa | 1359 | |
0188d6c5 SW |
1360 | if (odip != ndip) { |
1361 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1362 | 0, &r_gh); | |
b3b94faa DT |
1363 | if (error) |
1364 | goto out; | |
1365 | ||
0188d6c5 SW |
1366 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1367 | dir_rename = 1; | |
1368 | /* don't move a dirctory into it's subdir */ | |
1369 | error = gfs2_ok_to_move(ip, ndip); | |
1370 | if (error) | |
1371 | goto out_gunlock_r; | |
1372 | } | |
b3b94faa DT |
1373 | } |
1374 | ||
d9d1ca30 | 1375 | num_gh = 1; |
b3b94faa | 1376 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1377 | if (odip != ndip) { |
1378 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1379 | num_gh++; | |
1380 | } | |
1381 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1382 | num_gh++; | |
b3b94faa | 1383 | |
d9d1ca30 SW |
1384 | if (nip) { |
1385 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1386 | num_gh++; | |
ddee7608 RC |
1387 | /* grab the resource lock for unlink flag twiddling |
1388 | * this is the case of the target file already existing | |
1389 | * so we unlink before doing the rename | |
1390 | */ | |
dbb7cae2 | 1391 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); |
ddee7608 RC |
1392 | if (nrgd) |
1393 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1394 | } |
b3b94faa | 1395 | |
72dbf479 BP |
1396 | for (x = 0; x < num_gh; x++) { |
1397 | error = gfs2_glock_nq(ghs + x); | |
1398 | if (error) | |
1399 | goto out_gunlock; | |
1400 | } | |
b3b94faa | 1401 | |
d192a8e5 SW |
1402 | error = -ENOENT; |
1403 | if (ip->i_inode.i_nlink == 0) | |
1404 | goto out_gunlock; | |
1405 | ||
b3b94faa DT |
1406 | /* Check out the old directory */ |
1407 | ||
1408 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1409 | if (error) | |
1410 | goto out_gunlock; | |
1411 | ||
1412 | /* Check out the new directory */ | |
1413 | ||
1414 | if (nip) { | |
1415 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1416 | if (error) | |
1417 | goto out_gunlock; | |
1418 | ||
d192a8e5 SW |
1419 | if (nip->i_inode.i_nlink == 0) { |
1420 | error = -EAGAIN; | |
1421 | goto out_gunlock; | |
1422 | } | |
1423 | ||
b60623c2 | 1424 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1425 | if (nip->i_entries < 2) { |
94fb763b | 1426 | gfs2_consist_inode(nip); |
b3b94faa DT |
1427 | error = -EIO; |
1428 | goto out_gunlock; | |
1429 | } | |
ad6203f2 | 1430 | if (nip->i_entries > 2) { |
b3b94faa DT |
1431 | error = -ENOTEMPTY; |
1432 | goto out_gunlock; | |
1433 | } | |
1434 | } | |
1435 | } else { | |
b74c79e9 | 1436 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0); |
b3b94faa DT |
1437 | if (error) |
1438 | goto out_gunlock; | |
1439 | ||
dbb7cae2 | 1440 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1441 | switch (error) { |
1442 | case -ENOENT: | |
1443 | error = 0; | |
1444 | break; | |
1445 | case 0: | |
1446 | error = -EEXIST; | |
1447 | default: | |
1448 | goto out_gunlock; | |
1449 | }; | |
1450 | ||
1451 | if (odip != ndip) { | |
4f56110a | 1452 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1453 | error = -ENOENT; |
b3b94faa DT |
1454 | goto out_gunlock; |
1455 | } | |
ad6203f2 | 1456 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1457 | error = -EFBIG; |
1458 | goto out_gunlock; | |
1459 | } | |
b60623c2 | 1460 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1461 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1462 | error = -EMLINK; |
1463 | goto out_gunlock; | |
1464 | } | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | /* Check out the dir to be renamed */ | |
1469 | ||
1470 | if (dir_rename) { | |
b74c79e9 | 1471 | error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0); |
b3b94faa DT |
1472 | if (error) |
1473 | goto out_gunlock; | |
1474 | } | |
1475 | ||
24b977b5 SW |
1476 | if (nip == NULL) |
1477 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
1478 | error = alloc_required; | |
c752666c | 1479 | if (error < 0) |
b3b94faa | 1480 | goto out_gunlock; |
c752666c | 1481 | error = 0; |
b3b94faa DT |
1482 | |
1483 | if (alloc_required) { | |
1484 | struct gfs2_alloc *al = gfs2_alloc_get(ndip); | |
182fe5ab CG |
1485 | if (!al) { |
1486 | error = -ENOMEM; | |
1487 | goto out_gunlock; | |
1488 | } | |
b3b94faa | 1489 | |
d82661d9 | 1490 | error = gfs2_quota_lock_check(ndip); |
b3b94faa DT |
1491 | if (error) |
1492 | goto out_alloc; | |
1493 | ||
b3b94faa DT |
1494 | al->al_requested = sdp->sd_max_dirres; |
1495 | ||
46290341 | 1496 | error = gfs2_inplace_reserve_ri(ndip); |
b3b94faa DT |
1497 | if (error) |
1498 | goto out_gunlock_q; | |
1499 | ||
fe1bdedc | 1500 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bf97b673 | 1501 | gfs2_rg_blocks(al) + |
b3b94faa | 1502 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 1503 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
1504 | if (error) |
1505 | goto out_ipreserv; | |
1506 | } else { | |
1507 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1508 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1509 | if (error) |
1510 | goto out_gunlock; | |
1511 | } | |
1512 | ||
1513 | /* Remove the target file, if it exists */ | |
1514 | ||
1515 | if (nip) { | |
855d23ce SW |
1516 | struct buffer_head *bh; |
1517 | error = gfs2_meta_inode_buffer(nip, &bh); | |
b3b94faa DT |
1518 | if (error) |
1519 | goto out_end_trans; | |
855d23ce SW |
1520 | error = gfs2_unlink_inode(ndip, ndentry, bh); |
1521 | brelse(bh); | |
b3b94faa DT |
1522 | } |
1523 | ||
1524 | if (dir_rename) { | |
8d123585 | 1525 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1526 | if (error) |
1527 | goto out_end_trans; | |
1528 | } else { | |
1529 | struct buffer_head *dibh; | |
1530 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1531 | if (error) | |
1532 | goto out_end_trans; | |
4bd91ba1 | 1533 | ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 1534 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1535 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1536 | brelse(dibh); |
1537 | } | |
1538 | ||
855d23ce | 1539 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1540 | if (error) |
1541 | goto out_end_trans; | |
1542 | ||
3d6ecb7d | 1543 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip); |
b3b94faa DT |
1544 | if (error) |
1545 | goto out_end_trans; | |
1546 | ||
feaa7bba | 1547 | out_end_trans: |
b3b94faa | 1548 | gfs2_trans_end(sdp); |
feaa7bba | 1549 | out_ipreserv: |
b3b94faa DT |
1550 | if (alloc_required) |
1551 | gfs2_inplace_release(ndip); | |
feaa7bba | 1552 | out_gunlock_q: |
b3b94faa DT |
1553 | if (alloc_required) |
1554 | gfs2_quota_unlock(ndip); | |
feaa7bba | 1555 | out_alloc: |
b3b94faa DT |
1556 | if (alloc_required) |
1557 | gfs2_alloc_put(ndip); | |
feaa7bba | 1558 | out_gunlock: |
72dbf479 BP |
1559 | while (x--) { |
1560 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1561 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1562 | } |
feaa7bba | 1563 | out_gunlock_r: |
0188d6c5 | 1564 | if (r_gh.gh_gl) |
b3b94faa | 1565 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1566 | out: |
46290341 | 1567 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
1568 | return error; |
1569 | } | |
1570 | ||
536baf02 | 1571 | /** |
c177c2ac AV |
1572 | * gfs2_follow_link - Follow a symbolic link |
1573 | * @dentry: The dentry of the link | |
1574 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1575 | * |
c177c2ac | 1576 | * This can handle symlinks of any size. |
536baf02 | 1577 | * |
c177c2ac | 1578 | * Returns: 0 on success or error code |
536baf02 SW |
1579 | */ |
1580 | ||
c177c2ac | 1581 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1582 | { |
c177c2ac | 1583 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1584 | struct gfs2_holder i_gh; |
1585 | struct buffer_head *dibh; | |
a2e0f799 | 1586 | unsigned int x, size; |
c177c2ac | 1587 | char *buf; |
536baf02 SW |
1588 | int error; |
1589 | ||
1590 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1591 | error = gfs2_glock_nq(&i_gh); | |
1592 | if (error) { | |
1593 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1594 | nd_set_link(nd, ERR_PTR(error)); |
1595 | return NULL; | |
536baf02 SW |
1596 | } |
1597 | ||
a2e0f799 SW |
1598 | size = (unsigned int)i_size_read(&ip->i_inode); |
1599 | if (size == 0) { | |
536baf02 | 1600 | gfs2_consist_inode(ip); |
c177c2ac | 1601 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1602 | goto out; |
1603 | } | |
1604 | ||
1605 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1606 | if (error) { |
1607 | buf = ERR_PTR(error); | |
536baf02 | 1608 | goto out; |
536baf02 SW |
1609 | } |
1610 | ||
a2e0f799 | 1611 | x = size + 1; |
c177c2ac AV |
1612 | buf = kmalloc(x, GFP_NOFS); |
1613 | if (!buf) | |
1614 | buf = ERR_PTR(-ENOMEM); | |
1615 | else | |
1616 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
536baf02 SW |
1617 | brelse(dibh); |
1618 | out: | |
1619 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1620 | nd_set_link(nd, buf); |
1621 | return NULL; | |
b3b94faa DT |
1622 | } |
1623 | ||
c177c2ac | 1624 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1625 | { |
c177c2ac AV |
1626 | char *s = nd_get_link(nd); |
1627 | if (!IS_ERR(s)) | |
1628 | kfree(s); | |
b3b94faa DT |
1629 | } |
1630 | ||
1631 | /** | |
1632 | * gfs2_permission - | |
75d5cfbe SW |
1633 | * @inode: The inode |
1634 | * @mask: The mask to be tested | |
1635 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1636 | * |
300c7d75 SW |
1637 | * This may be called from the VFS directly, or from within GFS2 with the |
1638 | * inode locked, so we look to see if the glock is already locked and only | |
1639 | * lock the glock if its not already been done. | |
1640 | * | |
b3b94faa DT |
1641 | * Returns: errno |
1642 | */ | |
1643 | ||
b74c79e9 | 1644 | int gfs2_permission(struct inode *inode, int mask, unsigned int flags) |
b3b94faa | 1645 | { |
b74c79e9 | 1646 | struct gfs2_inode *ip; |
b3b94faa DT |
1647 | struct gfs2_holder i_gh; |
1648 | int error; | |
300c7d75 | 1649 | int unlock = 0; |
b3b94faa | 1650 | |
b74c79e9 NP |
1651 | |
1652 | ip = GFS2_I(inode); | |
7afd88d9 | 1653 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
75d5cfbe SW |
1654 | if (flags & IPERM_FLAG_RCU) |
1655 | return -ECHILD; | |
300c7d75 SW |
1656 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1657 | if (error) | |
1658 | return error; | |
1659 | unlock = 1; | |
1660 | } | |
b3b94faa | 1661 | |
f58ba889 MS |
1662 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1663 | error = -EACCES; | |
1664 | else | |
b74c79e9 | 1665 | error = generic_permission(inode, mask, flags, gfs2_check_acl); |
300c7d75 | 1666 | if (unlock) |
b3b94faa | 1667 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1668 | |
1669 | return error; | |
1670 | } | |
1671 | ||
194c011f SW |
1672 | static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
1673 | { | |
1674 | struct inode *inode = &ip->i_inode; | |
1675 | struct buffer_head *dibh; | |
1676 | int error; | |
1677 | ||
1678 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1679 | if (error) | |
1680 | return error; | |
1681 | ||
1682 | setattr_copy(inode, attr); | |
1683 | mark_inode_dirty(inode); | |
1684 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
1685 | gfs2_dinode_out(ip, dibh->b_data); | |
1686 | brelse(dibh); | |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | /** | |
1691 | * gfs2_setattr_simple - | |
1692 | * @ip: | |
1693 | * @attr: | |
1694 | * | |
1695 | * Returns: errno | |
1696 | */ | |
1697 | ||
1698 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1699 | { | |
1700 | int error; | |
1701 | ||
1702 | if (current->journal_info) | |
1703 | return __gfs2_setattr_simple(ip, attr); | |
1704 | ||
1705 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); | |
1706 | if (error) | |
1707 | return error; | |
1708 | ||
1709 | error = __gfs2_setattr_simple(ip, attr); | |
1710 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); | |
1711 | return error; | |
1712 | } | |
1713 | ||
b3b94faa DT |
1714 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1715 | { | |
feaa7bba SW |
1716 | struct gfs2_inode *ip = GFS2_I(inode); |
1717 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
cd915493 | 1718 | u32 ouid, ogid, nuid, ngid; |
b3b94faa DT |
1719 | int error; |
1720 | ||
2933f925 SW |
1721 | ouid = inode->i_uid; |
1722 | ogid = inode->i_gid; | |
b3b94faa DT |
1723 | nuid = attr->ia_uid; |
1724 | ngid = attr->ia_gid; | |
1725 | ||
1726 | if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) | |
1727 | ouid = nuid = NO_QUOTA_CHANGE; | |
1728 | if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) | |
1729 | ogid = ngid = NO_QUOTA_CHANGE; | |
1730 | ||
182fe5ab CG |
1731 | if (!gfs2_alloc_get(ip)) |
1732 | return -ENOMEM; | |
b3b94faa DT |
1733 | |
1734 | error = gfs2_quota_lock(ip, nuid, ngid); | |
1735 | if (error) | |
1736 | goto out_alloc; | |
1737 | ||
1738 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
1739 | error = gfs2_quota_check(ip, nuid, ngid); | |
1740 | if (error) | |
1741 | goto out_gunlock_q; | |
1742 | } | |
1743 | ||
1744 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1745 | if (error) | |
1746 | goto out_gunlock_q; | |
1747 | ||
2ae51ed7 | 1748 | error = gfs2_setattr_simple(ip, attr); |
b3b94faa DT |
1749 | if (error) |
1750 | goto out_end_trans; | |
1751 | ||
b3b94faa | 1752 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { |
77658aad SW |
1753 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1754 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1755 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1756 | } |
1757 | ||
a91ea69f | 1758 | out_end_trans: |
b3b94faa | 1759 | gfs2_trans_end(sdp); |
a91ea69f | 1760 | out_gunlock_q: |
b3b94faa | 1761 | gfs2_quota_unlock(ip); |
a91ea69f | 1762 | out_alloc: |
b3b94faa | 1763 | gfs2_alloc_put(ip); |
b3b94faa DT |
1764 | return error; |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * gfs2_setattr - Change attributes on an inode | |
1769 | * @dentry: The dentry which is changing | |
1770 | * @attr: The structure describing the change | |
1771 | * | |
1772 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1773 | * that change out to disk. | |
1774 | * | |
1775 | * Returns: errno | |
1776 | */ | |
1777 | ||
1778 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1779 | { | |
1780 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1781 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1782 | struct gfs2_holder i_gh; |
1783 | int error; | |
1784 | ||
b3b94faa DT |
1785 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1786 | if (error) | |
1787 | return error; | |
1788 | ||
1789 | error = -EPERM; | |
1790 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1791 | goto out; | |
1792 | ||
1793 | error = inode_change_ok(inode, attr); | |
1794 | if (error) | |
1795 | goto out; | |
1796 | ||
1797 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1798 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1799 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1800 | error = setattr_chown(inode, attr); | |
1801 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1802 | error = gfs2_acl_chmod(ip, attr); | |
1803 | else | |
1804 | error = gfs2_setattr_simple(ip, attr); | |
1805 | ||
a91ea69f | 1806 | out: |
b3b94faa | 1807 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1808 | if (!error) |
1809 | mark_inode_dirty(inode); | |
b3b94faa DT |
1810 | return error; |
1811 | } | |
1812 | ||
1813 | /** | |
1814 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1815 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1816 | * @dentry: The dentry to stat |
1817 | * @stat: The inode's stats | |
1818 | * | |
dcf3dd85 SW |
1819 | * This may be called from the VFS directly, or from within GFS2 with the |
1820 | * inode locked, so we look to see if the glock is already locked and only | |
1821 | * lock the glock if its not already been done. Note that its the NFS | |
1822 | * readdirplus operation which causes this to be called (from filldir) | |
1823 | * with the glock already held. | |
1824 | * | |
b3b94faa DT |
1825 | * Returns: errno |
1826 | */ | |
1827 | ||
1828 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1829 | struct kstat *stat) | |
1830 | { | |
1831 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1832 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1833 | struct gfs2_holder gh; |
1834 | int error; | |
dcf3dd85 | 1835 | int unlock = 0; |
b3b94faa | 1836 | |
7afd88d9 | 1837 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1838 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1839 | if (error) | |
1840 | return error; | |
1841 | unlock = 1; | |
b3b94faa DT |
1842 | } |
1843 | ||
dcf3dd85 | 1844 | generic_fillattr(inode, stat); |
d7c103d0 | 1845 | if (unlock) |
dcf3dd85 SW |
1846 | gfs2_glock_dq_uninit(&gh); |
1847 | ||
1848 | return 0; | |
b3b94faa DT |
1849 | } |
1850 | ||
1851 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1852 | const void *data, size_t size, int flags) | |
1853 | { | |
feaa7bba | 1854 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1855 | struct gfs2_inode *ip = GFS2_I(inode); |
1856 | struct gfs2_holder gh; | |
1857 | int ret; | |
b3b94faa | 1858 | |
40b78a32 SW |
1859 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1860 | ret = gfs2_glock_nq(&gh); | |
1861 | if (ret == 0) { | |
1862 | ret = generic_setxattr(dentry, name, data, size, flags); | |
1863 | gfs2_glock_dq(&gh); | |
1864 | } | |
1865 | gfs2_holder_uninit(&gh); | |
1866 | return ret; | |
b3b94faa DT |
1867 | } |
1868 | ||
1869 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1870 | void *data, size_t size) | |
1871 | { | |
40b78a32 SW |
1872 | struct inode *inode = dentry->d_inode; |
1873 | struct gfs2_inode *ip = GFS2_I(inode); | |
1874 | struct gfs2_holder gh; | |
1875 | int ret; | |
b3b94faa | 1876 | |
40b78a32 SW |
1877 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1878 | ret = gfs2_glock_nq(&gh); | |
1879 | if (ret == 0) { | |
1880 | ret = generic_getxattr(dentry, name, data, size); | |
1881 | gfs2_glock_dq(&gh); | |
1882 | } | |
1883 | gfs2_holder_uninit(&gh); | |
1884 | return ret; | |
b3b94faa DT |
1885 | } |
1886 | ||
1887 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1888 | { | |
40b78a32 SW |
1889 | struct inode *inode = dentry->d_inode; |
1890 | struct gfs2_inode *ip = GFS2_I(inode); | |
1891 | struct gfs2_holder gh; | |
1892 | int ret; | |
b3b94faa | 1893 | |
40b78a32 SW |
1894 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1895 | ret = gfs2_glock_nq(&gh); | |
1896 | if (ret == 0) { | |
1897 | ret = generic_removexattr(dentry, name); | |
1898 | gfs2_glock_dq(&gh); | |
1899 | } | |
1900 | gfs2_holder_uninit(&gh); | |
1901 | return ret; | |
b3b94faa DT |
1902 | } |
1903 | ||
e9079cce SW |
1904 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1905 | u64 start, u64 len) | |
1906 | { | |
1907 | struct gfs2_inode *ip = GFS2_I(inode); | |
1908 | struct gfs2_holder gh; | |
1909 | int ret; | |
1910 | ||
1911 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1912 | if (ret) | |
1913 | return ret; | |
1914 | ||
1915 | mutex_lock(&inode->i_mutex); | |
1916 | ||
1917 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1918 | if (ret) | |
1919 | goto out; | |
1920 | ||
1921 | if (gfs2_is_stuffed(ip)) { | |
1922 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1923 | u64 size = i_size_read(inode); | |
1924 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1925 | FIEMAP_EXTENT_DATA_INLINE; | |
1926 | phys += sizeof(struct gfs2_dinode); | |
1927 | phys += start; | |
1928 | if (start + len > size) | |
1929 | len = size - start; | |
1930 | if (start < size) | |
1931 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1932 | len, flags); | |
1933 | if (ret == 1) | |
1934 | ret = 0; | |
1935 | } else { | |
1936 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1937 | gfs2_block_map); | |
1938 | } | |
1939 | ||
1940 | gfs2_glock_dq_uninit(&gh); | |
1941 | out: | |
1942 | mutex_unlock(&inode->i_mutex); | |
1943 | return ret; | |
1944 | } | |
1945 | ||
92e1d5be | 1946 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1947 | .permission = gfs2_permission, |
b3b94faa DT |
1948 | .setattr = gfs2_setattr, |
1949 | .getattr = gfs2_getattr, | |
1950 | .setxattr = gfs2_setxattr, | |
1951 | .getxattr = gfs2_getxattr, | |
1952 | .listxattr = gfs2_listxattr, | |
1953 | .removexattr = gfs2_removexattr, | |
e9079cce | 1954 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1955 | }; |
1956 | ||
92e1d5be | 1957 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1958 | .create = gfs2_create, |
1959 | .lookup = gfs2_lookup, | |
1960 | .link = gfs2_link, | |
1961 | .unlink = gfs2_unlink, | |
1962 | .symlink = gfs2_symlink, | |
1963 | .mkdir = gfs2_mkdir, | |
855d23ce | 1964 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1965 | .mknod = gfs2_mknod, |
1966 | .rename = gfs2_rename, | |
e6305c43 | 1967 | .permission = gfs2_permission, |
b3b94faa DT |
1968 | .setattr = gfs2_setattr, |
1969 | .getattr = gfs2_getattr, | |
1970 | .setxattr = gfs2_setxattr, | |
1971 | .getxattr = gfs2_getxattr, | |
1972 | .listxattr = gfs2_listxattr, | |
1973 | .removexattr = gfs2_removexattr, | |
e9079cce | 1974 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1975 | }; |
1976 | ||
92e1d5be | 1977 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1978 | .readlink = generic_readlink, |
b3b94faa | 1979 | .follow_link = gfs2_follow_link, |
c177c2ac | 1980 | .put_link = gfs2_put_link, |
e6305c43 | 1981 | .permission = gfs2_permission, |
b3b94faa DT |
1982 | .setattr = gfs2_setattr, |
1983 | .getattr = gfs2_getattr, | |
1984 | .setxattr = gfs2_setxattr, | |
1985 | .getxattr = gfs2_getxattr, | |
1986 | .listxattr = gfs2_listxattr, | |
1987 | .removexattr = gfs2_removexattr, | |
e9079cce | 1988 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1989 | }; |
1990 |