Commit | Line | Data |
---|---|---|
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> | |
15 | #include <linux/utsname.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/xattr.h> | |
18 | #include <linux/posix_acl.h> | |
5c676f6d | 19 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 20 | #include <linux/crc32.h> |
e9079cce | 21 | #include <linux/fiemap.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" | |
29 | #include "eaops.h" | |
30 | #include "eattr.h" | |
31 | #include "glock.h" | |
32 | #include "inode.h" | |
33 | #include "meta_io.h" | |
b3b94faa DT |
34 | #include "quota.h" |
35 | #include "rgrp.h" | |
36 | #include "trans.h" | |
5c676f6d | 37 | #include "util.h" |
b2760583 | 38 | #include "super.h" |
b3b94faa DT |
39 | |
40 | /** | |
41 | * gfs2_create - Create a file | |
42 | * @dir: The directory in which to create the file | |
43 | * @dentry: The dentry of the new file | |
44 | * @mode: The mode of the new file | |
45 | * | |
46 | * Returns: errno | |
47 | */ | |
48 | ||
49 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
50 | int mode, struct nameidata *nd) | |
51 | { | |
feaa7bba SW |
52 | struct gfs2_inode *dip = GFS2_I(dir); |
53 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
54 | struct gfs2_holder ghs[2]; |
55 | struct inode *inode; | |
b3b94faa | 56 | |
b3b94faa DT |
57 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
58 | ||
59 | for (;;) { | |
e7f14f4d | 60 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); |
7359a19c | 61 | if (!IS_ERR(inode)) { |
b3b94faa | 62 | gfs2_trans_end(sdp); |
6dbd8224 | 63 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
64 | gfs2_inplace_release(dip); |
65 | gfs2_quota_unlock(dip); | |
66 | gfs2_alloc_put(dip); | |
67 | gfs2_glock_dq_uninit_m(2, ghs); | |
3a8476dd | 68 | mark_inode_dirty(inode); |
b3b94faa | 69 | break; |
7359a19c | 70 | } else if (PTR_ERR(inode) != -EEXIST || |
3516586a | 71 | (nd && nd->flags & LOOKUP_EXCL)) { |
b3b94faa | 72 | gfs2_holder_uninit(ghs); |
7359a19c | 73 | return PTR_ERR(inode); |
b3b94faa DT |
74 | } |
75 | ||
a569c711 | 76 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c SW |
77 | if (inode) { |
78 | if (!IS_ERR(inode)) { | |
c752666c SW |
79 | gfs2_holder_uninit(ghs); |
80 | break; | |
81 | } else { | |
82 | gfs2_holder_uninit(ghs); | |
83 | return PTR_ERR(inode); | |
84 | } | |
b3b94faa DT |
85 | } |
86 | } | |
87 | ||
b3b94faa | 88 | d_instantiate(dentry, inode); |
b3b94faa DT |
89 | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /** | |
94 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
95 | * @dir: The directory inode | |
96 | * @dentry: The dentry of the new inode | |
97 | * @nd: passed from Linux VFS, ignored by us | |
98 | * | |
99 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
100 | * | |
101 | * Returns: errno | |
102 | */ | |
103 | ||
104 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
105 | struct nameidata *nd) | |
106 | { | |
b3b94faa | 107 | struct inode *inode = NULL; |
b3b94faa | 108 | |
c752666c | 109 | dentry->d_op = &gfs2_dops; |
b3b94faa | 110 | |
a569c711 | 111 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c | 112 | if (inode && IS_ERR(inode)) |
e231c2ee | 113 | return ERR_CAST(inode); |
b3b94faa | 114 | |
9656b2c1 SW |
115 | if (inode) { |
116 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
117 | struct gfs2_holder gh; | |
118 | int error; | |
119 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
120 | if (error) { | |
121 | iput(inode); | |
122 | return ERR_PTR(error); | |
123 | } | |
124 | gfs2_glock_dq_uninit(&gh); | |
b3b94faa | 125 | return d_splice_alias(inode, dentry); |
9656b2c1 | 126 | } |
b3b94faa DT |
127 | d_add(dentry, inode); |
128 | ||
129 | return NULL; | |
130 | } | |
131 | ||
132 | /** | |
133 | * gfs2_link - Link to a file | |
134 | * @old_dentry: The inode to link | |
135 | * @dir: Add link to this directory | |
136 | * @dentry: The name of the link | |
137 | * | |
138 | * Link the inode in "old_dentry" into the directory "dir" with the | |
139 | * name in "dentry". | |
140 | * | |
141 | * Returns: errno | |
142 | */ | |
143 | ||
144 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
145 | struct dentry *dentry) | |
146 | { | |
feaa7bba SW |
147 | struct gfs2_inode *dip = GFS2_I(dir); |
148 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 149 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 150 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
151 | struct gfs2_holder ghs[2]; |
152 | int alloc_required; | |
153 | int error; | |
154 | ||
b60623c2 | 155 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
156 | return -EPERM; |
157 | ||
158 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); | |
159 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
160 | ||
72dbf479 BP |
161 | error = gfs2_glock_nq(ghs); /* parent */ |
162 | if (error) | |
163 | goto out_parent; | |
164 | ||
165 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 166 | if (error) |
72dbf479 | 167 | goto out_child; |
b3b94faa | 168 | |
f58ba889 | 169 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
170 | if (error) |
171 | goto out_gunlock; | |
172 | ||
dbb7cae2 | 173 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
174 | switch (error) { |
175 | case -ENOENT: | |
176 | break; | |
177 | case 0: | |
178 | error = -EEXIST; | |
179 | default: | |
180 | goto out_gunlock; | |
181 | } | |
182 | ||
183 | error = -EINVAL; | |
4f56110a | 184 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
185 | goto out_gunlock; |
186 | error = -EFBIG; | |
ad6203f2 | 187 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
188 | goto out_gunlock; |
189 | error = -EPERM; | |
190 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
191 | goto out_gunlock; | |
192 | error = -EINVAL; | |
4f56110a | 193 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
194 | goto out_gunlock; |
195 | error = -EMLINK; | |
4f56110a | 196 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
197 | goto out_gunlock; |
198 | ||
c752666c SW |
199 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
200 | if (error < 0) | |
b3b94faa | 201 | goto out_gunlock; |
c752666c | 202 | error = 0; |
b3b94faa DT |
203 | |
204 | if (alloc_required) { | |
205 | struct gfs2_alloc *al = gfs2_alloc_get(dip); | |
182fe5ab CG |
206 | if (!al) { |
207 | error = -ENOMEM; | |
208 | goto out_gunlock; | |
209 | } | |
b3b94faa | 210 | |
d82661d9 | 211 | error = gfs2_quota_lock_check(dip); |
b3b94faa DT |
212 | if (error) |
213 | goto out_alloc; | |
214 | ||
b3b94faa DT |
215 | al->al_requested = sdp->sd_max_dirres; |
216 | ||
217 | error = gfs2_inplace_reserve(dip); | |
218 | if (error) | |
219 | goto out_gunlock_q; | |
220 | ||
1b50259b | 221 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 222 | al->al_rgd->rd_length + |
b3b94faa DT |
223 | 2 * RES_DINODE + RES_STATFS + |
224 | RES_QUOTA, 0); | |
225 | if (error) | |
226 | goto out_ipres; | |
227 | } else { | |
228 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
229 | if (error) | |
230 | goto out_ipres; | |
231 | } | |
232 | ||
dbb7cae2 | 233 | error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode)); |
b3b94faa DT |
234 | if (error) |
235 | goto out_end_trans; | |
236 | ||
237 | error = gfs2_change_nlink(ip, +1); | |
238 | ||
feaa7bba | 239 | out_end_trans: |
b3b94faa | 240 | gfs2_trans_end(sdp); |
feaa7bba | 241 | out_ipres: |
b3b94faa DT |
242 | if (alloc_required) |
243 | gfs2_inplace_release(dip); | |
feaa7bba | 244 | out_gunlock_q: |
b3b94faa DT |
245 | if (alloc_required) |
246 | gfs2_quota_unlock(dip); | |
feaa7bba | 247 | out_alloc: |
b3b94faa DT |
248 | if (alloc_required) |
249 | gfs2_alloc_put(dip); | |
feaa7bba | 250 | out_gunlock: |
72dbf479 BP |
251 | gfs2_glock_dq(ghs + 1); |
252 | out_child: | |
253 | gfs2_glock_dq(ghs); | |
254 | out_parent: | |
b3b94faa DT |
255 | gfs2_holder_uninit(ghs); |
256 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa | 257 | if (!error) { |
29937ac6 | 258 | atomic_inc(&inode->i_count); |
b3b94faa DT |
259 | d_instantiate(dentry, inode); |
260 | mark_inode_dirty(inode); | |
261 | } | |
b3b94faa DT |
262 | return error; |
263 | } | |
264 | ||
87ec2174 SW |
265 | /* |
266 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
267 | * @dip: the directory | |
268 | * @name: the name of the file | |
269 | * @ip: the inode | |
270 | * | |
271 | * Assumes that the lock on (at least) @dip is held. | |
272 | * | |
273 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
274 | */ | |
275 | ||
276 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
277 | const struct gfs2_inode *ip) | |
278 | { | |
279 | int error; | |
280 | ||
281 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
282 | return -EPERM; | |
283 | ||
284 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
285 | dip->i_inode.i_uid != current_fsuid() && | |
286 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) | |
287 | return -EPERM; | |
288 | ||
289 | if (IS_APPEND(&dip->i_inode)) | |
290 | return -EPERM; | |
291 | ||
292 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); | |
293 | if (error) | |
294 | return error; | |
295 | ||
296 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
297 | if (error) | |
298 | return error; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
b3b94faa DT |
303 | /** |
304 | * gfs2_unlink - Unlink a file | |
305 | * @dir: The inode of the directory containing the file to unlink | |
306 | * @dentry: The file itself | |
307 | * | |
308 | * Unlink a file. Call gfs2_unlinki() | |
309 | * | |
310 | * Returns: errno | |
311 | */ | |
312 | ||
313 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
314 | { | |
feaa7bba SW |
315 | struct gfs2_inode *dip = GFS2_I(dir); |
316 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
317 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
318 | struct gfs2_holder ghs[3]; |
319 | struct gfs2_rgrpd *rgd; | |
320 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
321 | int error; |
322 | ||
ddee7608 RC |
323 | error = gfs2_rindex_hold(sdp, &ri_gh); |
324 | if (error) | |
325 | return error; | |
326 | ||
b3b94faa | 327 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 328 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 329 | |
dbb7cae2 | 330 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
331 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
332 | ||
333 | ||
8497a46e | 334 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 335 | if (error) |
8497a46e SW |
336 | goto out_parent; |
337 | ||
338 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
339 | if (error) | |
340 | goto out_child; | |
341 | ||
342 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
343 | if (error) | |
344 | goto out_rgrp; | |
b3b94faa DT |
345 | |
346 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
347 | if (error) | |
72dbf479 | 348 | goto out_gunlock; |
b3b94faa | 349 | |
feaa7bba | 350 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0); |
b3b94faa | 351 | if (error) |
8497a46e | 352 | goto out_rgrp; |
b3b94faa | 353 | |
feaa7bba SW |
354 | error = gfs2_dir_del(dip, &dentry->d_name); |
355 | if (error) | |
356 | goto out_end_trans; | |
b3b94faa | 357 | |
feaa7bba | 358 | error = gfs2_change_nlink(ip, -1); |
b3b94faa | 359 | |
feaa7bba SW |
360 | out_end_trans: |
361 | gfs2_trans_end(sdp); | |
72dbf479 | 362 | out_gunlock: |
8497a46e SW |
363 | gfs2_glock_dq(ghs + 2); |
364 | out_rgrp: | |
ddee7608 | 365 | gfs2_holder_uninit(ghs + 2); |
8497a46e SW |
366 | gfs2_glock_dq(ghs + 1); |
367 | out_child: | |
368 | gfs2_holder_uninit(ghs + 1); | |
369 | gfs2_glock_dq(ghs); | |
370 | out_parent: | |
371 | gfs2_holder_uninit(ghs); | |
ddee7608 | 372 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
373 | return error; |
374 | } | |
375 | ||
376 | /** | |
377 | * gfs2_symlink - Create a symlink | |
378 | * @dir: The directory to create the symlink in | |
379 | * @dentry: The dentry to put the symlink in | |
380 | * @symname: The thing which the link points to | |
381 | * | |
382 | * Returns: errno | |
383 | */ | |
384 | ||
385 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
386 | const char *symname) | |
387 | { | |
feaa7bba SW |
388 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
389 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
390 | struct gfs2_holder ghs[2]; |
391 | struct inode *inode; | |
392 | struct buffer_head *dibh; | |
393 | int size; | |
394 | int error; | |
395 | ||
b3b94faa DT |
396 | /* Must be stuffed with a null terminator for gfs2_follow_link() */ |
397 | size = strlen(symname); | |
398 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
399 | return -ENAMETOOLONG; | |
400 | ||
401 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
402 | ||
e7f14f4d | 403 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); |
7359a19c | 404 | if (IS_ERR(inode)) { |
b3b94faa | 405 | gfs2_holder_uninit(ghs); |
7359a19c | 406 | return PTR_ERR(inode); |
b3b94faa DT |
407 | } |
408 | ||
5c676f6d | 409 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 410 | |
c9e98886 | 411 | ip->i_disksize = size; |
5cf32524 | 412 | i_size_write(inode, size); |
b3b94faa DT |
413 | |
414 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
415 | ||
416 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
539e5d6b | 417 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
418 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, |
419 | size); | |
420 | brelse(dibh); | |
421 | } | |
422 | ||
423 | gfs2_trans_end(sdp); | |
6dbd8224 | 424 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
425 | gfs2_inplace_release(dip); |
426 | gfs2_quota_unlock(dip); | |
427 | gfs2_alloc_put(dip); | |
428 | ||
429 | gfs2_glock_dq_uninit_m(2, ghs); | |
430 | ||
b3b94faa DT |
431 | d_instantiate(dentry, inode); |
432 | mark_inode_dirty(inode); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | /** | |
438 | * gfs2_mkdir - Make a directory | |
439 | * @dir: The parent directory of the new one | |
440 | * @dentry: The dentry of the new directory | |
441 | * @mode: The mode of the new directory | |
442 | * | |
443 | * Returns: errno | |
444 | */ | |
445 | ||
446 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
447 | { | |
feaa7bba SW |
448 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
449 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
450 | struct gfs2_holder ghs[2]; |
451 | struct inode *inode; | |
452 | struct buffer_head *dibh; | |
453 | int error; | |
454 | ||
b3b94faa DT |
455 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
456 | ||
e7f14f4d | 457 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); |
7359a19c | 458 | if (IS_ERR(inode)) { |
b3b94faa | 459 | gfs2_holder_uninit(ghs); |
7359a19c | 460 | return PTR_ERR(inode); |
b3b94faa DT |
461 | } |
462 | ||
5c676f6d | 463 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 464 | |
4f56110a | 465 | ip->i_inode.i_nlink = 2; |
c9e98886 | 466 | ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); |
383f01fb | 467 | ip->i_diskflags |= GFS2_DIF_JDATA; |
ad6203f2 | 468 | ip->i_entries = 2; |
b3b94faa DT |
469 | |
470 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
471 | ||
472 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
473 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
c752666c | 474 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); |
71b86f56 | 475 | struct qstr str; |
b3b94faa | 476 | |
71b86f56 | 477 | gfs2_str2qstr(&str, "."); |
c752666c SW |
478 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
479 | gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent); | |
b3b94faa | 480 | dent->de_inum = di->di_num; /* already GFS2 endian */ |
7ecdb70a | 481 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa DT |
482 | di->di_entries = cpu_to_be32(1); |
483 | ||
71b86f56 | 484 | gfs2_str2qstr(&str, ".."); |
c752666c SW |
485 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); |
486 | gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
b3b94faa | 487 | |
dbb7cae2 | 488 | gfs2_inum_out(dip, dent); |
7ecdb70a | 489 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa | 490 | |
539e5d6b | 491 | gfs2_dinode_out(ip, di); |
b3b94faa DT |
492 | |
493 | brelse(dibh); | |
494 | } | |
495 | ||
496 | error = gfs2_change_nlink(dip, +1); | |
497 | gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ | |
498 | ||
499 | gfs2_trans_end(sdp); | |
6dbd8224 | 500 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
501 | gfs2_inplace_release(dip); |
502 | gfs2_quota_unlock(dip); | |
503 | gfs2_alloc_put(dip); | |
504 | ||
505 | gfs2_glock_dq_uninit_m(2, ghs); | |
506 | ||
b3b94faa DT |
507 | d_instantiate(dentry, inode); |
508 | mark_inode_dirty(inode); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
2286dbfa SW |
513 | /** |
514 | * gfs2_rmdiri - Remove a directory | |
515 | * @dip: The parent directory of the directory to be removed | |
516 | * @name: The name of the directory to be removed | |
517 | * @ip: The GFS2 inode of the directory to be removed | |
518 | * | |
519 | * Assumes Glocks on dip and ip are held | |
520 | * | |
521 | * Returns: errno | |
522 | */ | |
523 | ||
524 | static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, | |
525 | struct gfs2_inode *ip) | |
526 | { | |
527 | struct qstr dotname; | |
528 | int error; | |
529 | ||
530 | if (ip->i_entries != 2) { | |
531 | if (gfs2_consist_inode(ip)) | |
532 | gfs2_dinode_print(ip); | |
533 | return -EIO; | |
534 | } | |
535 | ||
536 | error = gfs2_dir_del(dip, name); | |
537 | if (error) | |
538 | return error; | |
539 | ||
540 | error = gfs2_change_nlink(dip, -1); | |
541 | if (error) | |
542 | return error; | |
543 | ||
544 | gfs2_str2qstr(&dotname, "."); | |
545 | error = gfs2_dir_del(ip, &dotname); | |
546 | if (error) | |
547 | return error; | |
548 | ||
549 | gfs2_str2qstr(&dotname, ".."); | |
550 | error = gfs2_dir_del(ip, &dotname); | |
551 | if (error) | |
552 | return error; | |
553 | ||
554 | /* It looks odd, but it really should be done twice */ | |
555 | error = gfs2_change_nlink(ip, -1); | |
556 | if (error) | |
557 | return error; | |
558 | ||
559 | error = gfs2_change_nlink(ip, -1); | |
560 | if (error) | |
561 | return error; | |
562 | ||
563 | return error; | |
564 | } | |
565 | ||
b3b94faa DT |
566 | /** |
567 | * gfs2_rmdir - Remove a directory | |
568 | * @dir: The parent directory of the directory to be removed | |
569 | * @dentry: The dentry of the directory to remove | |
570 | * | |
571 | * Remove a directory. Call gfs2_rmdiri() | |
572 | * | |
573 | * Returns: errno | |
574 | */ | |
575 | ||
576 | static int gfs2_rmdir(struct inode *dir, struct dentry *dentry) | |
577 | { | |
feaa7bba SW |
578 | struct gfs2_inode *dip = GFS2_I(dir); |
579 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
580 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
581 | struct gfs2_holder ghs[3]; |
582 | struct gfs2_rgrpd *rgd; | |
583 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
584 | int error; |
585 | ||
ddee7608 RC |
586 | error = gfs2_rindex_hold(sdp, &ri_gh); |
587 | if (error) | |
588 | return error; | |
b3b94faa DT |
589 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
590 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
591 | ||
dbb7cae2 | 592 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
593 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
594 | ||
72dbf479 BP |
595 | error = gfs2_glock_nq(ghs); /* parent */ |
596 | if (error) | |
597 | goto out_parent; | |
598 | ||
599 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 600 | if (error) |
72dbf479 BP |
601 | goto out_child; |
602 | ||
603 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
604 | if (error) | |
605 | goto out_rgrp; | |
b3b94faa DT |
606 | |
607 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
608 | if (error) | |
609 | goto out_gunlock; | |
610 | ||
ad6203f2 | 611 | if (ip->i_entries < 2) { |
b3b94faa | 612 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 613 | gfs2_dinode_print(ip); |
b3b94faa DT |
614 | error = -EIO; |
615 | goto out_gunlock; | |
616 | } | |
ad6203f2 | 617 | if (ip->i_entries > 2) { |
b3b94faa DT |
618 | error = -ENOTEMPTY; |
619 | goto out_gunlock; | |
620 | } | |
621 | ||
feaa7bba | 622 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0); |
b3b94faa DT |
623 | if (error) |
624 | goto out_gunlock; | |
625 | ||
feaa7bba | 626 | error = gfs2_rmdiri(dip, &dentry->d_name, ip); |
b3b94faa DT |
627 | |
628 | gfs2_trans_end(sdp); | |
629 | ||
a91ea69f | 630 | out_gunlock: |
72dbf479 BP |
631 | gfs2_glock_dq(ghs + 2); |
632 | out_rgrp: | |
ddee7608 | 633 | gfs2_holder_uninit(ghs + 2); |
72dbf479 BP |
634 | gfs2_glock_dq(ghs + 1); |
635 | out_child: | |
636 | gfs2_holder_uninit(ghs + 1); | |
637 | gfs2_glock_dq(ghs); | |
638 | out_parent: | |
639 | gfs2_holder_uninit(ghs); | |
ddee7608 | 640 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
641 | return error; |
642 | } | |
643 | ||
644 | /** | |
645 | * gfs2_mknod - Make a special file | |
646 | * @dir: The directory in which the special file will reside | |
647 | * @dentry: The dentry of the special file | |
648 | * @mode: The mode of the special file | |
649 | * @rdev: The device specification of the special file | |
650 | * | |
651 | */ | |
652 | ||
653 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
654 | dev_t dev) | |
655 | { | |
e7f14f4d | 656 | struct gfs2_inode *dip = GFS2_I(dir); |
feaa7bba | 657 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
b3b94faa DT |
658 | struct gfs2_holder ghs[2]; |
659 | struct inode *inode; | |
b3b94faa DT |
660 | |
661 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
662 | ||
e7f14f4d | 663 | inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); |
7359a19c | 664 | if (IS_ERR(inode)) { |
b3b94faa | 665 | gfs2_holder_uninit(ghs); |
7359a19c | 666 | return PTR_ERR(inode); |
b3b94faa DT |
667 | } |
668 | ||
b3b94faa | 669 | gfs2_trans_end(sdp); |
6dbd8224 | 670 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
671 | gfs2_inplace_release(dip); |
672 | gfs2_quota_unlock(dip); | |
673 | gfs2_alloc_put(dip); | |
674 | ||
675 | gfs2_glock_dq_uninit_m(2, ghs); | |
676 | ||
b3b94faa DT |
677 | d_instantiate(dentry, inode); |
678 | mark_inode_dirty(inode); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
0188d6c5 SW |
683 | /* |
684 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
685 | * @this: move this | |
686 | * @to: to here | |
687 | * | |
688 | * Follow @to back to the root and make sure we don't encounter @this | |
689 | * Assumes we already hold the rename lock. | |
690 | * | |
691 | * Returns: errno | |
692 | */ | |
693 | ||
694 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
695 | { | |
696 | struct inode *dir = &to->i_inode; | |
697 | struct super_block *sb = dir->i_sb; | |
698 | struct inode *tmp; | |
699 | struct qstr dotdot; | |
700 | int error = 0; | |
701 | ||
702 | gfs2_str2qstr(&dotdot, ".."); | |
703 | ||
704 | igrab(dir); | |
705 | ||
706 | for (;;) { | |
707 | if (dir == &this->i_inode) { | |
708 | error = -EINVAL; | |
709 | break; | |
710 | } | |
711 | if (dir == sb->s_root->d_inode) { | |
712 | error = 0; | |
713 | break; | |
714 | } | |
715 | ||
716 | tmp = gfs2_lookupi(dir, &dotdot, 1); | |
717 | if (IS_ERR(tmp)) { | |
718 | error = PTR_ERR(tmp); | |
719 | break; | |
720 | } | |
721 | ||
722 | iput(dir); | |
723 | dir = tmp; | |
724 | } | |
725 | ||
726 | iput(dir); | |
727 | ||
728 | return error; | |
729 | } | |
730 | ||
b3b94faa DT |
731 | /** |
732 | * gfs2_rename - Rename a file | |
733 | * @odir: Parent directory of old file name | |
734 | * @odentry: The old dentry of the file | |
735 | * @ndir: Parent directory of new file name | |
736 | * @ndentry: The new dentry of the file | |
737 | * | |
738 | * Returns: errno | |
739 | */ | |
740 | ||
741 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
742 | struct inode *ndir, struct dentry *ndentry) | |
743 | { | |
feaa7bba SW |
744 | struct gfs2_inode *odip = GFS2_I(odir); |
745 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
746 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 747 | struct gfs2_inode *nip = NULL; |
feaa7bba | 748 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
0188d6c5 | 749 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 750 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
751 | unsigned int num_gh; |
752 | int dir_rename = 0; | |
753 | int alloc_required; | |
754 | unsigned int x; | |
755 | int error; | |
756 | ||
b3b94faa | 757 | if (ndentry->d_inode) { |
feaa7bba | 758 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
759 | if (ip == nip) |
760 | return 0; | |
761 | } | |
762 | ||
b3b94faa | 763 | |
0188d6c5 SW |
764 | if (odip != ndip) { |
765 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
766 | 0, &r_gh); | |
b3b94faa DT |
767 | if (error) |
768 | goto out; | |
769 | ||
0188d6c5 SW |
770 | if (S_ISDIR(ip->i_inode.i_mode)) { |
771 | dir_rename = 1; | |
772 | /* don't move a dirctory into it's subdir */ | |
773 | error = gfs2_ok_to_move(ip, ndip); | |
774 | if (error) | |
775 | goto out_gunlock_r; | |
776 | } | |
b3b94faa DT |
777 | } |
778 | ||
d9d1ca30 | 779 | num_gh = 1; |
b3b94faa | 780 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
781 | if (odip != ndip) { |
782 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
783 | num_gh++; | |
784 | } | |
785 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
786 | num_gh++; | |
b3b94faa | 787 | |
d9d1ca30 SW |
788 | if (nip) { |
789 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
790 | num_gh++; | |
ddee7608 RC |
791 | /* grab the resource lock for unlink flag twiddling |
792 | * this is the case of the target file already existing | |
793 | * so we unlink before doing the rename | |
794 | */ | |
dbb7cae2 | 795 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); |
ddee7608 RC |
796 | if (nrgd) |
797 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 798 | } |
b3b94faa | 799 | |
72dbf479 BP |
800 | for (x = 0; x < num_gh; x++) { |
801 | error = gfs2_glock_nq(ghs + x); | |
802 | if (error) | |
803 | goto out_gunlock; | |
804 | } | |
b3b94faa DT |
805 | |
806 | /* Check out the old directory */ | |
807 | ||
808 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
809 | if (error) | |
810 | goto out_gunlock; | |
811 | ||
812 | /* Check out the new directory */ | |
813 | ||
814 | if (nip) { | |
815 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
816 | if (error) | |
817 | goto out_gunlock; | |
818 | ||
b60623c2 | 819 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 820 | if (nip->i_entries < 2) { |
b3b94faa | 821 | if (gfs2_consist_inode(nip)) |
4cc14f0b | 822 | gfs2_dinode_print(nip); |
b3b94faa DT |
823 | error = -EIO; |
824 | goto out_gunlock; | |
825 | } | |
ad6203f2 | 826 | if (nip->i_entries > 2) { |
b3b94faa DT |
827 | error = -ENOTEMPTY; |
828 | goto out_gunlock; | |
829 | } | |
830 | } | |
831 | } else { | |
f58ba889 | 832 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
833 | if (error) |
834 | goto out_gunlock; | |
835 | ||
dbb7cae2 | 836 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
837 | switch (error) { |
838 | case -ENOENT: | |
839 | error = 0; | |
840 | break; | |
841 | case 0: | |
842 | error = -EEXIST; | |
843 | default: | |
844 | goto out_gunlock; | |
845 | }; | |
846 | ||
847 | if (odip != ndip) { | |
4f56110a | 848 | if (!ndip->i_inode.i_nlink) { |
b3b94faa DT |
849 | error = -EINVAL; |
850 | goto out_gunlock; | |
851 | } | |
ad6203f2 | 852 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
853 | error = -EFBIG; |
854 | goto out_gunlock; | |
855 | } | |
b60623c2 | 856 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 857 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
858 | error = -EMLINK; |
859 | goto out_gunlock; | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
864 | /* Check out the dir to be renamed */ | |
865 | ||
866 | if (dir_rename) { | |
f58ba889 | 867 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
868 | if (error) |
869 | goto out_gunlock; | |
870 | } | |
871 | ||
c752666c SW |
872 | alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); |
873 | if (error < 0) | |
b3b94faa | 874 | goto out_gunlock; |
c752666c | 875 | error = 0; |
b3b94faa DT |
876 | |
877 | if (alloc_required) { | |
878 | struct gfs2_alloc *al = gfs2_alloc_get(ndip); | |
182fe5ab CG |
879 | if (!al) { |
880 | error = -ENOMEM; | |
881 | goto out_gunlock; | |
882 | } | |
b3b94faa | 883 | |
d82661d9 | 884 | error = gfs2_quota_lock_check(ndip); |
b3b94faa DT |
885 | if (error) |
886 | goto out_alloc; | |
887 | ||
b3b94faa DT |
888 | al->al_requested = sdp->sd_max_dirres; |
889 | ||
890 | error = gfs2_inplace_reserve(ndip); | |
891 | if (error) | |
892 | goto out_gunlock_q; | |
893 | ||
fe1bdedc | 894 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 895 | al->al_rgd->rd_length + |
b3b94faa | 896 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 897 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
898 | if (error) |
899 | goto out_ipreserv; | |
900 | } else { | |
901 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 902 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
903 | if (error) |
904 | goto out_gunlock; | |
905 | } | |
906 | ||
907 | /* Remove the target file, if it exists */ | |
908 | ||
909 | if (nip) { | |
b60623c2 | 910 | if (S_ISDIR(nip->i_inode.i_mode)) |
feaa7bba SW |
911 | error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); |
912 | else { | |
913 | error = gfs2_dir_del(ndip, &ndentry->d_name); | |
914 | if (error) | |
915 | goto out_end_trans; | |
87d21e07 | 916 | error = gfs2_change_nlink(nip, -1); |
feaa7bba | 917 | } |
b3b94faa DT |
918 | if (error) |
919 | goto out_end_trans; | |
920 | } | |
921 | ||
922 | if (dir_rename) { | |
923 | struct qstr name; | |
71b86f56 | 924 | gfs2_str2qstr(&name, ".."); |
b3b94faa DT |
925 | |
926 | error = gfs2_change_nlink(ndip, +1); | |
927 | if (error) | |
928 | goto out_end_trans; | |
929 | error = gfs2_change_nlink(odip, -1); | |
930 | if (error) | |
931 | goto out_end_trans; | |
932 | ||
ffed8ab3 | 933 | error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR); |
b3b94faa DT |
934 | if (error) |
935 | goto out_end_trans; | |
936 | } else { | |
937 | struct buffer_head *dibh; | |
938 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
939 | if (error) | |
940 | goto out_end_trans; | |
4bd91ba1 | 941 | ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 942 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 943 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
944 | brelse(dibh); |
945 | } | |
946 | ||
947 | error = gfs2_dir_del(odip, &odentry->d_name); | |
948 | if (error) | |
949 | goto out_end_trans; | |
950 | ||
dbb7cae2 | 951 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
952 | if (error) |
953 | goto out_end_trans; | |
954 | ||
feaa7bba | 955 | out_end_trans: |
b3b94faa | 956 | gfs2_trans_end(sdp); |
feaa7bba | 957 | out_ipreserv: |
b3b94faa DT |
958 | if (alloc_required) |
959 | gfs2_inplace_release(ndip); | |
feaa7bba | 960 | out_gunlock_q: |
b3b94faa DT |
961 | if (alloc_required) |
962 | gfs2_quota_unlock(ndip); | |
feaa7bba | 963 | out_alloc: |
b3b94faa DT |
964 | if (alloc_required) |
965 | gfs2_alloc_put(ndip); | |
feaa7bba | 966 | out_gunlock: |
72dbf479 BP |
967 | while (x--) { |
968 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 969 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 970 | } |
feaa7bba | 971 | out_gunlock_r: |
0188d6c5 | 972 | if (r_gh.gh_gl) |
b3b94faa | 973 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 974 | out: |
b3b94faa DT |
975 | return error; |
976 | } | |
977 | ||
536baf02 SW |
978 | /** |
979 | * gfs2_readlinki - return the contents of a symlink | |
980 | * @ip: the symlink's inode | |
981 | * @buf: a pointer to the buffer to be filled | |
982 | * @len: a pointer to the length of @buf | |
983 | * | |
984 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
985 | * to be freed by the caller. | |
986 | * | |
987 | * Returns: errno | |
988 | */ | |
989 | ||
990 | static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
991 | { | |
992 | struct gfs2_holder i_gh; | |
993 | struct buffer_head *dibh; | |
994 | unsigned int x; | |
995 | int error; | |
996 | ||
997 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
998 | error = gfs2_glock_nq(&i_gh); | |
999 | if (error) { | |
1000 | gfs2_holder_uninit(&i_gh); | |
1001 | return error; | |
1002 | } | |
1003 | ||
1004 | if (!ip->i_disksize) { | |
1005 | gfs2_consist_inode(ip); | |
1006 | error = -EIO; | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1011 | if (error) | |
1012 | goto out; | |
1013 | ||
1014 | x = ip->i_disksize + 1; | |
1015 | if (x > *len) { | |
1016 | *buf = kmalloc(x, GFP_NOFS); | |
1017 | if (!*buf) { | |
1018 | error = -ENOMEM; | |
1019 | goto out_brelse; | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1024 | *len = x; | |
1025 | ||
1026 | out_brelse: | |
1027 | brelse(dibh); | |
1028 | out: | |
1029 | gfs2_glock_dq_uninit(&i_gh); | |
1030 | return error; | |
1031 | } | |
1032 | ||
b3b94faa DT |
1033 | /** |
1034 | * gfs2_readlink - Read the value of a symlink | |
1035 | * @dentry: the symlink | |
1036 | * @buf: the buffer to read the symlink data into | |
1037 | * @size: the size of the buffer | |
1038 | * | |
1039 | * Returns: errno | |
1040 | */ | |
1041 | ||
1042 | static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, | |
1043 | int user_size) | |
1044 | { | |
feaa7bba | 1045 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa DT |
1046 | char array[GFS2_FAST_NAME_SIZE], *buf = array; |
1047 | unsigned int len = GFS2_FAST_NAME_SIZE; | |
1048 | int error; | |
1049 | ||
b3b94faa DT |
1050 | error = gfs2_readlinki(ip, &buf, &len); |
1051 | if (error) | |
1052 | return error; | |
1053 | ||
1054 | if (user_size > len - 1) | |
1055 | user_size = len - 1; | |
1056 | ||
1057 | if (copy_to_user(user_buf, buf, user_size)) | |
1058 | error = -EFAULT; | |
1059 | else | |
1060 | error = user_size; | |
1061 | ||
1062 | if (buf != array) | |
1063 | kfree(buf); | |
1064 | ||
1065 | return error; | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * gfs2_follow_link - Follow a symbolic link | |
1070 | * @dentry: The dentry of the link | |
1071 | * @nd: Data that we pass to vfs_follow_link() | |
1072 | * | |
1073 | * This can handle symlinks of any size. It is optimised for symlinks | |
1074 | * under GFS2_FAST_NAME_SIZE. | |
1075 | * | |
1076 | * Returns: 0 on success or error code | |
1077 | */ | |
1078 | ||
1079 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1080 | { | |
feaa7bba | 1081 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa DT |
1082 | char array[GFS2_FAST_NAME_SIZE], *buf = array; |
1083 | unsigned int len = GFS2_FAST_NAME_SIZE; | |
1084 | int error; | |
1085 | ||
b3b94faa DT |
1086 | error = gfs2_readlinki(ip, &buf, &len); |
1087 | if (!error) { | |
1088 | error = vfs_follow_link(nd, buf); | |
1089 | if (buf != array) | |
1090 | kfree(buf); | |
1091 | } | |
1092 | ||
1093 | return ERR_PTR(error); | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * gfs2_permission - | |
1098 | * @inode: | |
1099 | * @mask: | |
1100 | * @nd: passed from Linux VFS, ignored by us | |
1101 | * | |
300c7d75 SW |
1102 | * This may be called from the VFS directly, or from within GFS2 with the |
1103 | * inode locked, so we look to see if the glock is already locked and only | |
1104 | * lock the glock if its not already been done. | |
1105 | * | |
b3b94faa DT |
1106 | * Returns: errno |
1107 | */ | |
1108 | ||
f58ba889 | 1109 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1110 | { |
feaa7bba | 1111 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1112 | struct gfs2_holder i_gh; |
1113 | int error; | |
300c7d75 | 1114 | int unlock = 0; |
b3b94faa | 1115 | |
7afd88d9 | 1116 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
300c7d75 SW |
1117 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1118 | if (error) | |
1119 | return error; | |
1120 | unlock = 1; | |
1121 | } | |
b3b94faa | 1122 | |
f58ba889 MS |
1123 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1124 | error = -EACCES; | |
1125 | else | |
1126 | error = generic_permission(inode, mask, gfs2_check_acl); | |
300c7d75 | 1127 | if (unlock) |
b3b94faa | 1128 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1129 | |
1130 | return error; | |
1131 | } | |
1132 | ||
1133 | static int setattr_size(struct inode *inode, struct iattr *attr) | |
1134 | { | |
feaa7bba | 1135 | struct gfs2_inode *ip = GFS2_I(inode); |
16615be1 | 1136 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
b3b94faa DT |
1137 | int error; |
1138 | ||
c9e98886 | 1139 | if (attr->ia_size != ip->i_disksize) { |
16615be1 | 1140 | error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
1141 | if (error) |
1142 | return error; | |
16615be1 SW |
1143 | error = vmtruncate(inode, attr->ia_size); |
1144 | gfs2_trans_end(sdp); | |
1145 | if (error) | |
1146 | return error; | |
b3b94faa DT |
1147 | } |
1148 | ||
aa6a85a9 | 1149 | error = gfs2_truncatei(ip, attr->ia_size); |
c9e98886 SW |
1150 | if (error && (inode->i_size != ip->i_disksize)) |
1151 | i_size_write(inode, ip->i_disksize); | |
b3b94faa DT |
1152 | |
1153 | return error; | |
1154 | } | |
1155 | ||
1156 | static int setattr_chown(struct inode *inode, struct iattr *attr) | |
1157 | { | |
feaa7bba SW |
1158 | struct gfs2_inode *ip = GFS2_I(inode); |
1159 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 1160 | struct buffer_head *dibh; |
cd915493 | 1161 | u32 ouid, ogid, nuid, ngid; |
b3b94faa DT |
1162 | int error; |
1163 | ||
2933f925 SW |
1164 | ouid = inode->i_uid; |
1165 | ogid = inode->i_gid; | |
b3b94faa DT |
1166 | nuid = attr->ia_uid; |
1167 | ngid = attr->ia_gid; | |
1168 | ||
1169 | if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) | |
1170 | ouid = nuid = NO_QUOTA_CHANGE; | |
1171 | if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) | |
1172 | ogid = ngid = NO_QUOTA_CHANGE; | |
1173 | ||
182fe5ab CG |
1174 | if (!gfs2_alloc_get(ip)) |
1175 | return -ENOMEM; | |
b3b94faa DT |
1176 | |
1177 | error = gfs2_quota_lock(ip, nuid, ngid); | |
1178 | if (error) | |
1179 | goto out_alloc; | |
1180 | ||
1181 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
1182 | error = gfs2_quota_check(ip, nuid, ngid); | |
1183 | if (error) | |
1184 | goto out_gunlock_q; | |
1185 | } | |
1186 | ||
1187 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1188 | if (error) | |
1189 | goto out_gunlock_q; | |
1190 | ||
1191 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1192 | if (error) | |
1193 | goto out_end_trans; | |
1194 | ||
1195 | error = inode_setattr(inode, attr); | |
1196 | gfs2_assert_warn(sdp, !error); | |
b3b94faa | 1197 | |
d4e9c4c3 | 1198 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1199 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1200 | brelse(dibh); |
1201 | ||
1202 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
77658aad SW |
1203 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1204 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1205 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1206 | } |
1207 | ||
a91ea69f | 1208 | out_end_trans: |
b3b94faa | 1209 | gfs2_trans_end(sdp); |
a91ea69f | 1210 | out_gunlock_q: |
b3b94faa | 1211 | gfs2_quota_unlock(ip); |
a91ea69f | 1212 | out_alloc: |
b3b94faa | 1213 | gfs2_alloc_put(ip); |
b3b94faa DT |
1214 | return error; |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * gfs2_setattr - Change attributes on an inode | |
1219 | * @dentry: The dentry which is changing | |
1220 | * @attr: The structure describing the change | |
1221 | * | |
1222 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1223 | * that change out to disk. | |
1224 | * | |
1225 | * Returns: errno | |
1226 | */ | |
1227 | ||
1228 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1229 | { | |
1230 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1231 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1232 | struct gfs2_holder i_gh; |
1233 | int error; | |
1234 | ||
b3b94faa DT |
1235 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1236 | if (error) | |
1237 | return error; | |
1238 | ||
1239 | error = -EPERM; | |
1240 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1241 | goto out; | |
1242 | ||
1243 | error = inode_change_ok(inode, attr); | |
1244 | if (error) | |
1245 | goto out; | |
1246 | ||
1247 | if (attr->ia_valid & ATTR_SIZE) | |
1248 | error = setattr_size(inode, attr); | |
1249 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) | |
1250 | error = setattr_chown(inode, attr); | |
1251 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1252 | error = gfs2_acl_chmod(ip, attr); | |
1253 | else | |
1254 | error = gfs2_setattr_simple(ip, attr); | |
1255 | ||
a91ea69f | 1256 | out: |
b3b94faa | 1257 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1258 | if (!error) |
1259 | mark_inode_dirty(inode); | |
b3b94faa DT |
1260 | return error; |
1261 | } | |
1262 | ||
1263 | /** | |
1264 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1265 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1266 | * @dentry: The dentry to stat |
1267 | * @stat: The inode's stats | |
1268 | * | |
dcf3dd85 SW |
1269 | * This may be called from the VFS directly, or from within GFS2 with the |
1270 | * inode locked, so we look to see if the glock is already locked and only | |
1271 | * lock the glock if its not already been done. Note that its the NFS | |
1272 | * readdirplus operation which causes this to be called (from filldir) | |
1273 | * with the glock already held. | |
1274 | * | |
b3b94faa DT |
1275 | * Returns: errno |
1276 | */ | |
1277 | ||
1278 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1279 | struct kstat *stat) | |
1280 | { | |
1281 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1282 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1283 | struct gfs2_holder gh; |
1284 | int error; | |
dcf3dd85 | 1285 | int unlock = 0; |
b3b94faa | 1286 | |
7afd88d9 | 1287 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1288 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1289 | if (error) | |
1290 | return error; | |
1291 | unlock = 1; | |
b3b94faa DT |
1292 | } |
1293 | ||
dcf3dd85 | 1294 | generic_fillattr(inode, stat); |
d7c103d0 | 1295 | if (unlock) |
dcf3dd85 SW |
1296 | gfs2_glock_dq_uninit(&gh); |
1297 | ||
1298 | return 0; | |
b3b94faa DT |
1299 | } |
1300 | ||
1301 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1302 | const void *data, size_t size, int flags) | |
1303 | { | |
feaa7bba | 1304 | struct inode *inode = dentry->d_inode; |
b3b94faa DT |
1305 | struct gfs2_ea_request er; |
1306 | ||
b3b94faa DT |
1307 | memset(&er, 0, sizeof(struct gfs2_ea_request)); |
1308 | er.er_type = gfs2_ea_name2type(name, &er.er_name); | |
1309 | if (er.er_type == GFS2_EATYPE_UNUSED) | |
1310 | return -EOPNOTSUPP; | |
1311 | er.er_data = (char *)data; | |
1312 | er.er_name_len = strlen(er.er_name); | |
1313 | er.er_data_len = size; | |
1314 | er.er_flags = flags; | |
1315 | ||
feaa7bba | 1316 | gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE)); |
b3b94faa | 1317 | |
feaa7bba | 1318 | return gfs2_ea_set(GFS2_I(inode), &er); |
b3b94faa DT |
1319 | } |
1320 | ||
1321 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1322 | void *data, size_t size) | |
1323 | { | |
1324 | struct gfs2_ea_request er; | |
1325 | ||
b3b94faa DT |
1326 | memset(&er, 0, sizeof(struct gfs2_ea_request)); |
1327 | er.er_type = gfs2_ea_name2type(name, &er.er_name); | |
1328 | if (er.er_type == GFS2_EATYPE_UNUSED) | |
1329 | return -EOPNOTSUPP; | |
1330 | er.er_data = data; | |
1331 | er.er_name_len = strlen(er.er_name); | |
1332 | er.er_data_len = size; | |
1333 | ||
feaa7bba | 1334 | return gfs2_ea_get(GFS2_I(dentry->d_inode), &er); |
b3b94faa DT |
1335 | } |
1336 | ||
1337 | static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
1338 | { | |
1339 | struct gfs2_ea_request er; | |
1340 | ||
b3b94faa DT |
1341 | memset(&er, 0, sizeof(struct gfs2_ea_request)); |
1342 | er.er_data = (size) ? buffer : NULL; | |
1343 | er.er_data_len = size; | |
1344 | ||
feaa7bba | 1345 | return gfs2_ea_list(GFS2_I(dentry->d_inode), &er); |
b3b94faa DT |
1346 | } |
1347 | ||
1348 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1349 | { | |
1350 | struct gfs2_ea_request er; | |
1351 | ||
b3b94faa DT |
1352 | memset(&er, 0, sizeof(struct gfs2_ea_request)); |
1353 | er.er_type = gfs2_ea_name2type(name, &er.er_name); | |
1354 | if (er.er_type == GFS2_EATYPE_UNUSED) | |
1355 | return -EOPNOTSUPP; | |
1356 | er.er_name_len = strlen(er.er_name); | |
1357 | ||
feaa7bba | 1358 | return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er); |
b3b94faa DT |
1359 | } |
1360 | ||
e9079cce SW |
1361 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1362 | u64 start, u64 len) | |
1363 | { | |
1364 | struct gfs2_inode *ip = GFS2_I(inode); | |
1365 | struct gfs2_holder gh; | |
1366 | int ret; | |
1367 | ||
1368 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1369 | if (ret) | |
1370 | return ret; | |
1371 | ||
1372 | mutex_lock(&inode->i_mutex); | |
1373 | ||
1374 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1375 | if (ret) | |
1376 | goto out; | |
1377 | ||
1378 | if (gfs2_is_stuffed(ip)) { | |
1379 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1380 | u64 size = i_size_read(inode); | |
1381 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1382 | FIEMAP_EXTENT_DATA_INLINE; | |
1383 | phys += sizeof(struct gfs2_dinode); | |
1384 | phys += start; | |
1385 | if (start + len > size) | |
1386 | len = size - start; | |
1387 | if (start < size) | |
1388 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1389 | len, flags); | |
1390 | if (ret == 1) | |
1391 | ret = 0; | |
1392 | } else { | |
1393 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1394 | gfs2_block_map); | |
1395 | } | |
1396 | ||
1397 | gfs2_glock_dq_uninit(&gh); | |
1398 | out: | |
1399 | mutex_unlock(&inode->i_mutex); | |
1400 | return ret; | |
1401 | } | |
1402 | ||
92e1d5be | 1403 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1404 | .permission = gfs2_permission, |
b3b94faa DT |
1405 | .setattr = gfs2_setattr, |
1406 | .getattr = gfs2_getattr, | |
1407 | .setxattr = gfs2_setxattr, | |
1408 | .getxattr = gfs2_getxattr, | |
1409 | .listxattr = gfs2_listxattr, | |
1410 | .removexattr = gfs2_removexattr, | |
e9079cce | 1411 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1412 | }; |
1413 | ||
92e1d5be | 1414 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1415 | .create = gfs2_create, |
1416 | .lookup = gfs2_lookup, | |
1417 | .link = gfs2_link, | |
1418 | .unlink = gfs2_unlink, | |
1419 | .symlink = gfs2_symlink, | |
1420 | .mkdir = gfs2_mkdir, | |
1421 | .rmdir = gfs2_rmdir, | |
1422 | .mknod = gfs2_mknod, | |
1423 | .rename = gfs2_rename, | |
e6305c43 | 1424 | .permission = gfs2_permission, |
b3b94faa DT |
1425 | .setattr = gfs2_setattr, |
1426 | .getattr = gfs2_getattr, | |
1427 | .setxattr = gfs2_setxattr, | |
1428 | .getxattr = gfs2_getxattr, | |
1429 | .listxattr = gfs2_listxattr, | |
1430 | .removexattr = gfs2_removexattr, | |
e9079cce | 1431 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1432 | }; |
1433 | ||
92e1d5be | 1434 | const struct inode_operations gfs2_symlink_iops = { |
b3b94faa DT |
1435 | .readlink = gfs2_readlink, |
1436 | .follow_link = gfs2_follow_link, | |
e6305c43 | 1437 | .permission = gfs2_permission, |
b3b94faa DT |
1438 | .setattr = gfs2_setattr, |
1439 | .getattr = gfs2_getattr, | |
1440 | .setxattr = gfs2_setxattr, | |
1441 | .getxattr = gfs2_getxattr, | |
1442 | .listxattr = gfs2_listxattr, | |
1443 | .removexattr = gfs2_removexattr, | |
e9079cce | 1444 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1445 | }; |
1446 |