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Commit | Line | Data |
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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> | |
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" | |
b3b94faa DT |
29 | #include "eattr.h" |
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" |
b3b94faa DT |
38 | |
39 | /** | |
40 | * gfs2_create - Create a file | |
41 | * @dir: The directory in which to create the file | |
42 | * @dentry: The dentry of the new file | |
43 | * @mode: The mode of the new file | |
44 | * | |
45 | * Returns: errno | |
46 | */ | |
47 | ||
48 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
49 | int mode, struct nameidata *nd) | |
50 | { | |
feaa7bba SW |
51 | struct gfs2_inode *dip = GFS2_I(dir); |
52 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
53 | struct gfs2_holder ghs[2]; |
54 | struct inode *inode; | |
b3b94faa | 55 | |
b3b94faa DT |
56 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
57 | ||
58 | for (;;) { | |
e7f14f4d | 59 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); |
7359a19c | 60 | if (!IS_ERR(inode)) { |
b3b94faa | 61 | gfs2_trans_end(sdp); |
6dbd8224 | 62 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
63 | gfs2_inplace_release(dip); |
64 | gfs2_quota_unlock(dip); | |
65 | gfs2_alloc_put(dip); | |
66 | gfs2_glock_dq_uninit_m(2, ghs); | |
3a8476dd | 67 | mark_inode_dirty(inode); |
b3b94faa | 68 | break; |
7359a19c | 69 | } else if (PTR_ERR(inode) != -EEXIST || |
3516586a | 70 | (nd && nd->flags & LOOKUP_EXCL)) { |
b3b94faa | 71 | gfs2_holder_uninit(ghs); |
7359a19c | 72 | return PTR_ERR(inode); |
b3b94faa DT |
73 | } |
74 | ||
a569c711 | 75 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c SW |
76 | if (inode) { |
77 | if (!IS_ERR(inode)) { | |
c752666c SW |
78 | gfs2_holder_uninit(ghs); |
79 | break; | |
80 | } else { | |
81 | gfs2_holder_uninit(ghs); | |
82 | return PTR_ERR(inode); | |
83 | } | |
b3b94faa DT |
84 | } |
85 | } | |
86 | ||
b3b94faa | 87 | d_instantiate(dentry, inode); |
b3b94faa DT |
88 | |
89 | return 0; | |
90 | } | |
91 | ||
92 | /** | |
93 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
94 | * @dir: The directory inode | |
95 | * @dentry: The dentry of the new inode | |
96 | * @nd: passed from Linux VFS, ignored by us | |
97 | * | |
98 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
99 | * | |
100 | * Returns: errno | |
101 | */ | |
102 | ||
103 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
104 | struct nameidata *nd) | |
105 | { | |
b3b94faa | 106 | struct inode *inode = NULL; |
b3b94faa | 107 | |
c752666c | 108 | dentry->d_op = &gfs2_dops; |
b3b94faa | 109 | |
a569c711 | 110 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c | 111 | if (inode && IS_ERR(inode)) |
e231c2ee | 112 | return ERR_CAST(inode); |
b3b94faa | 113 | |
9656b2c1 SW |
114 | if (inode) { |
115 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
116 | struct gfs2_holder gh; | |
117 | int error; | |
118 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
119 | if (error) { | |
120 | iput(inode); | |
121 | return ERR_PTR(error); | |
122 | } | |
123 | gfs2_glock_dq_uninit(&gh); | |
b3b94faa | 124 | return d_splice_alias(inode, dentry); |
9656b2c1 | 125 | } |
b3b94faa DT |
126 | d_add(dentry, inode); |
127 | ||
128 | return NULL; | |
129 | } | |
130 | ||
131 | /** | |
132 | * gfs2_link - Link to a file | |
133 | * @old_dentry: The inode to link | |
134 | * @dir: Add link to this directory | |
135 | * @dentry: The name of the link | |
136 | * | |
137 | * Link the inode in "old_dentry" into the directory "dir" with the | |
138 | * name in "dentry". | |
139 | * | |
140 | * Returns: errno | |
141 | */ | |
142 | ||
143 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
144 | struct dentry *dentry) | |
145 | { | |
feaa7bba SW |
146 | struct gfs2_inode *dip = GFS2_I(dir); |
147 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 148 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 149 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
150 | struct gfs2_holder ghs[2]; |
151 | int alloc_required; | |
152 | int error; | |
153 | ||
b60623c2 | 154 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
155 | return -EPERM; |
156 | ||
157 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); | |
158 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
159 | ||
72dbf479 BP |
160 | error = gfs2_glock_nq(ghs); /* parent */ |
161 | if (error) | |
162 | goto out_parent; | |
163 | ||
164 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 165 | if (error) |
72dbf479 | 166 | goto out_child; |
b3b94faa | 167 | |
f58ba889 | 168 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
169 | if (error) |
170 | goto out_gunlock; | |
171 | ||
dbb7cae2 | 172 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
173 | switch (error) { |
174 | case -ENOENT: | |
175 | break; | |
176 | case 0: | |
177 | error = -EEXIST; | |
178 | default: | |
179 | goto out_gunlock; | |
180 | } | |
181 | ||
182 | error = -EINVAL; | |
4f56110a | 183 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
184 | goto out_gunlock; |
185 | error = -EFBIG; | |
ad6203f2 | 186 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
187 | goto out_gunlock; |
188 | error = -EPERM; | |
189 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
190 | goto out_gunlock; | |
191 | error = -EINVAL; | |
4f56110a | 192 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
193 | goto out_gunlock; |
194 | error = -EMLINK; | |
4f56110a | 195 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
196 | goto out_gunlock; |
197 | ||
c752666c SW |
198 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
199 | if (error < 0) | |
b3b94faa | 200 | goto out_gunlock; |
c752666c | 201 | error = 0; |
b3b94faa DT |
202 | |
203 | if (alloc_required) { | |
204 | struct gfs2_alloc *al = gfs2_alloc_get(dip); | |
182fe5ab CG |
205 | if (!al) { |
206 | error = -ENOMEM; | |
207 | goto out_gunlock; | |
208 | } | |
b3b94faa | 209 | |
d82661d9 | 210 | error = gfs2_quota_lock_check(dip); |
b3b94faa DT |
211 | if (error) |
212 | goto out_alloc; | |
213 | ||
b3b94faa DT |
214 | al->al_requested = sdp->sd_max_dirres; |
215 | ||
216 | error = gfs2_inplace_reserve(dip); | |
217 | if (error) | |
218 | goto out_gunlock_q; | |
219 | ||
1b50259b | 220 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 221 | al->al_rgd->rd_length + |
b3b94faa DT |
222 | 2 * RES_DINODE + RES_STATFS + |
223 | RES_QUOTA, 0); | |
224 | if (error) | |
225 | goto out_ipres; | |
226 | } else { | |
227 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
228 | if (error) | |
229 | goto out_ipres; | |
230 | } | |
231 | ||
dbb7cae2 | 232 | error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode)); |
b3b94faa DT |
233 | if (error) |
234 | goto out_end_trans; | |
235 | ||
236 | error = gfs2_change_nlink(ip, +1); | |
237 | ||
feaa7bba | 238 | out_end_trans: |
b3b94faa | 239 | gfs2_trans_end(sdp); |
feaa7bba | 240 | out_ipres: |
b3b94faa DT |
241 | if (alloc_required) |
242 | gfs2_inplace_release(dip); | |
feaa7bba | 243 | out_gunlock_q: |
b3b94faa DT |
244 | if (alloc_required) |
245 | gfs2_quota_unlock(dip); | |
feaa7bba | 246 | out_alloc: |
b3b94faa DT |
247 | if (alloc_required) |
248 | gfs2_alloc_put(dip); | |
feaa7bba | 249 | out_gunlock: |
72dbf479 BP |
250 | gfs2_glock_dq(ghs + 1); |
251 | out_child: | |
252 | gfs2_glock_dq(ghs); | |
253 | out_parent: | |
b3b94faa DT |
254 | gfs2_holder_uninit(ghs); |
255 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa | 256 | if (!error) { |
29937ac6 | 257 | atomic_inc(&inode->i_count); |
b3b94faa DT |
258 | d_instantiate(dentry, inode); |
259 | mark_inode_dirty(inode); | |
260 | } | |
b3b94faa DT |
261 | return error; |
262 | } | |
263 | ||
87ec2174 SW |
264 | /* |
265 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
266 | * @dip: the directory | |
267 | * @name: the name of the file | |
268 | * @ip: the inode | |
269 | * | |
270 | * Assumes that the lock on (at least) @dip is held. | |
271 | * | |
272 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
273 | */ | |
274 | ||
275 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
276 | const struct gfs2_inode *ip) | |
277 | { | |
278 | int error; | |
279 | ||
280 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
281 | return -EPERM; | |
282 | ||
283 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
284 | dip->i_inode.i_uid != current_fsuid() && | |
285 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) | |
286 | return -EPERM; | |
287 | ||
288 | if (IS_APPEND(&dip->i_inode)) | |
289 | return -EPERM; | |
290 | ||
291 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); | |
292 | if (error) | |
293 | return error; | |
294 | ||
295 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
296 | if (error) | |
297 | return error; | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
b3b94faa DT |
302 | /** |
303 | * gfs2_unlink - Unlink a file | |
304 | * @dir: The inode of the directory containing the file to unlink | |
305 | * @dentry: The file itself | |
306 | * | |
307 | * Unlink a file. Call gfs2_unlinki() | |
308 | * | |
309 | * Returns: errno | |
310 | */ | |
311 | ||
312 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
313 | { | |
feaa7bba SW |
314 | struct gfs2_inode *dip = GFS2_I(dir); |
315 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
316 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
317 | struct gfs2_holder ghs[3]; |
318 | struct gfs2_rgrpd *rgd; | |
319 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
320 | int error; |
321 | ||
ddee7608 RC |
322 | error = gfs2_rindex_hold(sdp, &ri_gh); |
323 | if (error) | |
324 | return error; | |
325 | ||
b3b94faa | 326 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 327 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 328 | |
dbb7cae2 | 329 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
330 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
331 | ||
332 | ||
8497a46e | 333 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 334 | if (error) |
8497a46e SW |
335 | goto out_parent; |
336 | ||
337 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
338 | if (error) | |
339 | goto out_child; | |
340 | ||
341 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
342 | if (error) | |
343 | goto out_rgrp; | |
b3b94faa DT |
344 | |
345 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
346 | if (error) | |
72dbf479 | 347 | goto out_gunlock; |
b3b94faa | 348 | |
feaa7bba | 349 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0); |
b3b94faa | 350 | if (error) |
cd012075 | 351 | goto out_gunlock; |
b3b94faa | 352 | |
feaa7bba SW |
353 | error = gfs2_dir_del(dip, &dentry->d_name); |
354 | if (error) | |
355 | goto out_end_trans; | |
b3b94faa | 356 | |
feaa7bba | 357 | error = gfs2_change_nlink(ip, -1); |
b3b94faa | 358 | |
feaa7bba SW |
359 | out_end_trans: |
360 | gfs2_trans_end(sdp); | |
72dbf479 | 361 | out_gunlock: |
8497a46e SW |
362 | gfs2_glock_dq(ghs + 2); |
363 | out_rgrp: | |
ddee7608 | 364 | gfs2_holder_uninit(ghs + 2); |
8497a46e SW |
365 | gfs2_glock_dq(ghs + 1); |
366 | out_child: | |
367 | gfs2_holder_uninit(ghs + 1); | |
368 | gfs2_glock_dq(ghs); | |
369 | out_parent: | |
370 | gfs2_holder_uninit(ghs); | |
ddee7608 | 371 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
372 | return error; |
373 | } | |
374 | ||
375 | /** | |
376 | * gfs2_symlink - Create a symlink | |
377 | * @dir: The directory to create the symlink in | |
378 | * @dentry: The dentry to put the symlink in | |
379 | * @symname: The thing which the link points to | |
380 | * | |
381 | * Returns: errno | |
382 | */ | |
383 | ||
384 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
385 | const char *symname) | |
386 | { | |
feaa7bba SW |
387 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
388 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
389 | struct gfs2_holder ghs[2]; |
390 | struct inode *inode; | |
391 | struct buffer_head *dibh; | |
392 | int size; | |
393 | int error; | |
394 | ||
b3b94faa DT |
395 | /* Must be stuffed with a null terminator for gfs2_follow_link() */ |
396 | size = strlen(symname); | |
397 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
398 | return -ENAMETOOLONG; | |
399 | ||
400 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
401 | ||
e7f14f4d | 402 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); |
7359a19c | 403 | if (IS_ERR(inode)) { |
b3b94faa | 404 | gfs2_holder_uninit(ghs); |
7359a19c | 405 | return PTR_ERR(inode); |
b3b94faa DT |
406 | } |
407 | ||
5c676f6d | 408 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 409 | |
c9e98886 | 410 | ip->i_disksize = size; |
5cf32524 | 411 | i_size_write(inode, size); |
b3b94faa DT |
412 | |
413 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
414 | ||
415 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
539e5d6b | 416 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
417 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, |
418 | size); | |
419 | brelse(dibh); | |
420 | } | |
421 | ||
422 | gfs2_trans_end(sdp); | |
6dbd8224 | 423 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
424 | gfs2_inplace_release(dip); |
425 | gfs2_quota_unlock(dip); | |
426 | gfs2_alloc_put(dip); | |
427 | ||
428 | gfs2_glock_dq_uninit_m(2, ghs); | |
429 | ||
b3b94faa DT |
430 | d_instantiate(dentry, inode); |
431 | mark_inode_dirty(inode); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /** | |
437 | * gfs2_mkdir - Make a directory | |
438 | * @dir: The parent directory of the new one | |
439 | * @dentry: The dentry of the new directory | |
440 | * @mode: The mode of the new directory | |
441 | * | |
442 | * Returns: errno | |
443 | */ | |
444 | ||
445 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
446 | { | |
feaa7bba SW |
447 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
448 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
449 | struct gfs2_holder ghs[2]; |
450 | struct inode *inode; | |
451 | struct buffer_head *dibh; | |
452 | int error; | |
453 | ||
b3b94faa DT |
454 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
455 | ||
e7f14f4d | 456 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); |
7359a19c | 457 | if (IS_ERR(inode)) { |
b3b94faa | 458 | gfs2_holder_uninit(ghs); |
7359a19c | 459 | return PTR_ERR(inode); |
b3b94faa DT |
460 | } |
461 | ||
5c676f6d | 462 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 463 | |
4f56110a | 464 | ip->i_inode.i_nlink = 2; |
c9e98886 | 465 | ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); |
383f01fb | 466 | ip->i_diskflags |= GFS2_DIF_JDATA; |
ad6203f2 | 467 | ip->i_entries = 2; |
b3b94faa DT |
468 | |
469 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
470 | ||
471 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
472 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
c752666c | 473 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); |
71b86f56 | 474 | struct qstr str; |
b3b94faa | 475 | |
71b86f56 | 476 | gfs2_str2qstr(&str, "."); |
c752666c SW |
477 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
478 | gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent); | |
b3b94faa | 479 | dent->de_inum = di->di_num; /* already GFS2 endian */ |
7ecdb70a | 480 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa DT |
481 | di->di_entries = cpu_to_be32(1); |
482 | ||
71b86f56 | 483 | gfs2_str2qstr(&str, ".."); |
c752666c SW |
484 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); |
485 | gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
b3b94faa | 486 | |
dbb7cae2 | 487 | gfs2_inum_out(dip, dent); |
7ecdb70a | 488 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa | 489 | |
539e5d6b | 490 | gfs2_dinode_out(ip, di); |
b3b94faa DT |
491 | |
492 | brelse(dibh); | |
493 | } | |
494 | ||
495 | error = gfs2_change_nlink(dip, +1); | |
496 | gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ | |
497 | ||
498 | gfs2_trans_end(sdp); | |
6dbd8224 | 499 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
500 | gfs2_inplace_release(dip); |
501 | gfs2_quota_unlock(dip); | |
502 | gfs2_alloc_put(dip); | |
503 | ||
504 | gfs2_glock_dq_uninit_m(2, ghs); | |
505 | ||
b3b94faa DT |
506 | d_instantiate(dentry, inode); |
507 | mark_inode_dirty(inode); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
2286dbfa SW |
512 | /** |
513 | * gfs2_rmdiri - Remove a directory | |
514 | * @dip: The parent directory of the directory to be removed | |
515 | * @name: The name of the directory to be removed | |
516 | * @ip: The GFS2 inode of the directory to be removed | |
517 | * | |
518 | * Assumes Glocks on dip and ip are held | |
519 | * | |
520 | * Returns: errno | |
521 | */ | |
522 | ||
523 | static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, | |
524 | struct gfs2_inode *ip) | |
525 | { | |
526 | struct qstr dotname; | |
527 | int error; | |
528 | ||
529 | if (ip->i_entries != 2) { | |
530 | if (gfs2_consist_inode(ip)) | |
531 | gfs2_dinode_print(ip); | |
532 | return -EIO; | |
533 | } | |
534 | ||
535 | error = gfs2_dir_del(dip, name); | |
536 | if (error) | |
537 | return error; | |
538 | ||
539 | error = gfs2_change_nlink(dip, -1); | |
540 | if (error) | |
541 | return error; | |
542 | ||
543 | gfs2_str2qstr(&dotname, "."); | |
544 | error = gfs2_dir_del(ip, &dotname); | |
545 | if (error) | |
546 | return error; | |
547 | ||
548 | gfs2_str2qstr(&dotname, ".."); | |
549 | error = gfs2_dir_del(ip, &dotname); | |
550 | if (error) | |
551 | return error; | |
552 | ||
553 | /* It looks odd, but it really should be done twice */ | |
554 | error = gfs2_change_nlink(ip, -1); | |
555 | if (error) | |
556 | return error; | |
557 | ||
558 | error = gfs2_change_nlink(ip, -1); | |
559 | if (error) | |
560 | return error; | |
561 | ||
562 | return error; | |
563 | } | |
564 | ||
b3b94faa DT |
565 | /** |
566 | * gfs2_rmdir - Remove a directory | |
567 | * @dir: The parent directory of the directory to be removed | |
568 | * @dentry: The dentry of the directory to remove | |
569 | * | |
570 | * Remove a directory. Call gfs2_rmdiri() | |
571 | * | |
572 | * Returns: errno | |
573 | */ | |
574 | ||
575 | static int gfs2_rmdir(struct inode *dir, struct dentry *dentry) | |
576 | { | |
feaa7bba SW |
577 | struct gfs2_inode *dip = GFS2_I(dir); |
578 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
579 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
580 | struct gfs2_holder ghs[3]; |
581 | struct gfs2_rgrpd *rgd; | |
582 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
583 | int error; |
584 | ||
ddee7608 RC |
585 | error = gfs2_rindex_hold(sdp, &ri_gh); |
586 | if (error) | |
587 | return error; | |
b3b94faa DT |
588 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
589 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
590 | ||
dbb7cae2 | 591 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
592 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
593 | ||
72dbf479 BP |
594 | error = gfs2_glock_nq(ghs); /* parent */ |
595 | if (error) | |
596 | goto out_parent; | |
597 | ||
598 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 599 | if (error) |
72dbf479 BP |
600 | goto out_child; |
601 | ||
602 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
603 | if (error) | |
604 | goto out_rgrp; | |
b3b94faa DT |
605 | |
606 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
607 | if (error) | |
608 | goto out_gunlock; | |
609 | ||
ad6203f2 | 610 | if (ip->i_entries < 2) { |
b3b94faa | 611 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 612 | gfs2_dinode_print(ip); |
b3b94faa DT |
613 | error = -EIO; |
614 | goto out_gunlock; | |
615 | } | |
ad6203f2 | 616 | if (ip->i_entries > 2) { |
b3b94faa DT |
617 | error = -ENOTEMPTY; |
618 | goto out_gunlock; | |
619 | } | |
620 | ||
feaa7bba | 621 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0); |
b3b94faa DT |
622 | if (error) |
623 | goto out_gunlock; | |
624 | ||
feaa7bba | 625 | error = gfs2_rmdiri(dip, &dentry->d_name, ip); |
b3b94faa DT |
626 | |
627 | gfs2_trans_end(sdp); | |
628 | ||
a91ea69f | 629 | out_gunlock: |
72dbf479 BP |
630 | gfs2_glock_dq(ghs + 2); |
631 | out_rgrp: | |
ddee7608 | 632 | gfs2_holder_uninit(ghs + 2); |
72dbf479 BP |
633 | gfs2_glock_dq(ghs + 1); |
634 | out_child: | |
635 | gfs2_holder_uninit(ghs + 1); | |
636 | gfs2_glock_dq(ghs); | |
637 | out_parent: | |
638 | gfs2_holder_uninit(ghs); | |
ddee7608 | 639 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
640 | return error; |
641 | } | |
642 | ||
643 | /** | |
644 | * gfs2_mknod - Make a special file | |
645 | * @dir: The directory in which the special file will reside | |
646 | * @dentry: The dentry of the special file | |
647 | * @mode: The mode of the special file | |
648 | * @rdev: The device specification of the special file | |
649 | * | |
650 | */ | |
651 | ||
652 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
653 | dev_t dev) | |
654 | { | |
e7f14f4d | 655 | struct gfs2_inode *dip = GFS2_I(dir); |
feaa7bba | 656 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
b3b94faa DT |
657 | struct gfs2_holder ghs[2]; |
658 | struct inode *inode; | |
b3b94faa DT |
659 | |
660 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
661 | ||
e7f14f4d | 662 | inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); |
7359a19c | 663 | if (IS_ERR(inode)) { |
b3b94faa | 664 | gfs2_holder_uninit(ghs); |
7359a19c | 665 | return PTR_ERR(inode); |
b3b94faa DT |
666 | } |
667 | ||
b3b94faa | 668 | gfs2_trans_end(sdp); |
6dbd8224 | 669 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
670 | gfs2_inplace_release(dip); |
671 | gfs2_quota_unlock(dip); | |
672 | gfs2_alloc_put(dip); | |
673 | ||
674 | gfs2_glock_dq_uninit_m(2, ghs); | |
675 | ||
b3b94faa DT |
676 | d_instantiate(dentry, inode); |
677 | mark_inode_dirty(inode); | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
0188d6c5 SW |
682 | /* |
683 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
684 | * @this: move this | |
685 | * @to: to here | |
686 | * | |
687 | * Follow @to back to the root and make sure we don't encounter @this | |
688 | * Assumes we already hold the rename lock. | |
689 | * | |
690 | * Returns: errno | |
691 | */ | |
692 | ||
693 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
694 | { | |
695 | struct inode *dir = &to->i_inode; | |
696 | struct super_block *sb = dir->i_sb; | |
697 | struct inode *tmp; | |
698 | struct qstr dotdot; | |
699 | int error = 0; | |
700 | ||
701 | gfs2_str2qstr(&dotdot, ".."); | |
702 | ||
703 | igrab(dir); | |
704 | ||
705 | for (;;) { | |
706 | if (dir == &this->i_inode) { | |
707 | error = -EINVAL; | |
708 | break; | |
709 | } | |
710 | if (dir == sb->s_root->d_inode) { | |
711 | error = 0; | |
712 | break; | |
713 | } | |
714 | ||
715 | tmp = gfs2_lookupi(dir, &dotdot, 1); | |
716 | if (IS_ERR(tmp)) { | |
717 | error = PTR_ERR(tmp); | |
718 | break; | |
719 | } | |
720 | ||
721 | iput(dir); | |
722 | dir = tmp; | |
723 | } | |
724 | ||
725 | iput(dir); | |
726 | ||
727 | return error; | |
728 | } | |
729 | ||
b3b94faa DT |
730 | /** |
731 | * gfs2_rename - Rename a file | |
732 | * @odir: Parent directory of old file name | |
733 | * @odentry: The old dentry of the file | |
734 | * @ndir: Parent directory of new file name | |
735 | * @ndentry: The new dentry of the file | |
736 | * | |
737 | * Returns: errno | |
738 | */ | |
739 | ||
740 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
741 | struct inode *ndir, struct dentry *ndentry) | |
742 | { | |
feaa7bba SW |
743 | struct gfs2_inode *odip = GFS2_I(odir); |
744 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
745 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 746 | struct gfs2_inode *nip = NULL; |
feaa7bba | 747 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
0188d6c5 | 748 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 749 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
750 | unsigned int num_gh; |
751 | int dir_rename = 0; | |
752 | int alloc_required; | |
753 | unsigned int x; | |
754 | int error; | |
755 | ||
b3b94faa | 756 | if (ndentry->d_inode) { |
feaa7bba | 757 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
758 | if (ip == nip) |
759 | return 0; | |
760 | } | |
761 | ||
b3b94faa | 762 | |
0188d6c5 SW |
763 | if (odip != ndip) { |
764 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
765 | 0, &r_gh); | |
b3b94faa DT |
766 | if (error) |
767 | goto out; | |
768 | ||
0188d6c5 SW |
769 | if (S_ISDIR(ip->i_inode.i_mode)) { |
770 | dir_rename = 1; | |
771 | /* don't move a dirctory into it's subdir */ | |
772 | error = gfs2_ok_to_move(ip, ndip); | |
773 | if (error) | |
774 | goto out_gunlock_r; | |
775 | } | |
b3b94faa DT |
776 | } |
777 | ||
d9d1ca30 | 778 | num_gh = 1; |
b3b94faa | 779 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
780 | if (odip != ndip) { |
781 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
782 | num_gh++; | |
783 | } | |
784 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
785 | num_gh++; | |
b3b94faa | 786 | |
d9d1ca30 SW |
787 | if (nip) { |
788 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
789 | num_gh++; | |
ddee7608 RC |
790 | /* grab the resource lock for unlink flag twiddling |
791 | * this is the case of the target file already existing | |
792 | * so we unlink before doing the rename | |
793 | */ | |
dbb7cae2 | 794 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); |
ddee7608 RC |
795 | if (nrgd) |
796 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 797 | } |
b3b94faa | 798 | |
72dbf479 BP |
799 | for (x = 0; x < num_gh; x++) { |
800 | error = gfs2_glock_nq(ghs + x); | |
801 | if (error) | |
802 | goto out_gunlock; | |
803 | } | |
b3b94faa DT |
804 | |
805 | /* Check out the old directory */ | |
806 | ||
807 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
808 | if (error) | |
809 | goto out_gunlock; | |
810 | ||
811 | /* Check out the new directory */ | |
812 | ||
813 | if (nip) { | |
814 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
815 | if (error) | |
816 | goto out_gunlock; | |
817 | ||
b60623c2 | 818 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 819 | if (nip->i_entries < 2) { |
b3b94faa | 820 | if (gfs2_consist_inode(nip)) |
4cc14f0b | 821 | gfs2_dinode_print(nip); |
b3b94faa DT |
822 | error = -EIO; |
823 | goto out_gunlock; | |
824 | } | |
ad6203f2 | 825 | if (nip->i_entries > 2) { |
b3b94faa DT |
826 | error = -ENOTEMPTY; |
827 | goto out_gunlock; | |
828 | } | |
829 | } | |
830 | } else { | |
f58ba889 | 831 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
832 | if (error) |
833 | goto out_gunlock; | |
834 | ||
dbb7cae2 | 835 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
836 | switch (error) { |
837 | case -ENOENT: | |
838 | error = 0; | |
839 | break; | |
840 | case 0: | |
841 | error = -EEXIST; | |
842 | default: | |
843 | goto out_gunlock; | |
844 | }; | |
845 | ||
846 | if (odip != ndip) { | |
4f56110a | 847 | if (!ndip->i_inode.i_nlink) { |
b3b94faa DT |
848 | error = -EINVAL; |
849 | goto out_gunlock; | |
850 | } | |
ad6203f2 | 851 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
852 | error = -EFBIG; |
853 | goto out_gunlock; | |
854 | } | |
b60623c2 | 855 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 856 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
857 | error = -EMLINK; |
858 | goto out_gunlock; | |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | /* Check out the dir to be renamed */ | |
864 | ||
865 | if (dir_rename) { | |
f58ba889 | 866 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
867 | if (error) |
868 | goto out_gunlock; | |
869 | } | |
870 | ||
c752666c SW |
871 | alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); |
872 | if (error < 0) | |
b3b94faa | 873 | goto out_gunlock; |
c752666c | 874 | error = 0; |
b3b94faa DT |
875 | |
876 | if (alloc_required) { | |
877 | struct gfs2_alloc *al = gfs2_alloc_get(ndip); | |
182fe5ab CG |
878 | if (!al) { |
879 | error = -ENOMEM; | |
880 | goto out_gunlock; | |
881 | } | |
b3b94faa | 882 | |
d82661d9 | 883 | error = gfs2_quota_lock_check(ndip); |
b3b94faa DT |
884 | if (error) |
885 | goto out_alloc; | |
886 | ||
b3b94faa DT |
887 | al->al_requested = sdp->sd_max_dirres; |
888 | ||
889 | error = gfs2_inplace_reserve(ndip); | |
890 | if (error) | |
891 | goto out_gunlock_q; | |
892 | ||
fe1bdedc | 893 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 894 | al->al_rgd->rd_length + |
b3b94faa | 895 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 896 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
897 | if (error) |
898 | goto out_ipreserv; | |
899 | } else { | |
900 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 901 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
902 | if (error) |
903 | goto out_gunlock; | |
904 | } | |
905 | ||
906 | /* Remove the target file, if it exists */ | |
907 | ||
908 | if (nip) { | |
b60623c2 | 909 | if (S_ISDIR(nip->i_inode.i_mode)) |
feaa7bba SW |
910 | error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); |
911 | else { | |
912 | error = gfs2_dir_del(ndip, &ndentry->d_name); | |
913 | if (error) | |
914 | goto out_end_trans; | |
87d21e07 | 915 | error = gfs2_change_nlink(nip, -1); |
feaa7bba | 916 | } |
b3b94faa DT |
917 | if (error) |
918 | goto out_end_trans; | |
919 | } | |
920 | ||
921 | if (dir_rename) { | |
922 | struct qstr name; | |
71b86f56 | 923 | gfs2_str2qstr(&name, ".."); |
b3b94faa DT |
924 | |
925 | error = gfs2_change_nlink(ndip, +1); | |
926 | if (error) | |
927 | goto out_end_trans; | |
928 | error = gfs2_change_nlink(odip, -1); | |
929 | if (error) | |
930 | goto out_end_trans; | |
931 | ||
ffed8ab3 | 932 | error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR); |
b3b94faa DT |
933 | if (error) |
934 | goto out_end_trans; | |
935 | } else { | |
936 | struct buffer_head *dibh; | |
937 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
938 | if (error) | |
939 | goto out_end_trans; | |
4bd91ba1 | 940 | ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 941 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 942 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
943 | brelse(dibh); |
944 | } | |
945 | ||
946 | error = gfs2_dir_del(odip, &odentry->d_name); | |
947 | if (error) | |
948 | goto out_end_trans; | |
949 | ||
dbb7cae2 | 950 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
951 | if (error) |
952 | goto out_end_trans; | |
953 | ||
feaa7bba | 954 | out_end_trans: |
b3b94faa | 955 | gfs2_trans_end(sdp); |
feaa7bba | 956 | out_ipreserv: |
b3b94faa DT |
957 | if (alloc_required) |
958 | gfs2_inplace_release(ndip); | |
feaa7bba | 959 | out_gunlock_q: |
b3b94faa DT |
960 | if (alloc_required) |
961 | gfs2_quota_unlock(ndip); | |
feaa7bba | 962 | out_alloc: |
b3b94faa DT |
963 | if (alloc_required) |
964 | gfs2_alloc_put(ndip); | |
feaa7bba | 965 | out_gunlock: |
72dbf479 BP |
966 | while (x--) { |
967 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 968 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 969 | } |
feaa7bba | 970 | out_gunlock_r: |
0188d6c5 | 971 | if (r_gh.gh_gl) |
b3b94faa | 972 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 973 | out: |
b3b94faa DT |
974 | return error; |
975 | } | |
976 | ||
536baf02 SW |
977 | /** |
978 | * gfs2_readlinki - return the contents of a symlink | |
979 | * @ip: the symlink's inode | |
980 | * @buf: a pointer to the buffer to be filled | |
981 | * @len: a pointer to the length of @buf | |
982 | * | |
983 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
984 | * to be freed by the caller. | |
985 | * | |
986 | * Returns: errno | |
987 | */ | |
988 | ||
989 | static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
990 | { | |
991 | struct gfs2_holder i_gh; | |
992 | struct buffer_head *dibh; | |
993 | unsigned int x; | |
994 | int error; | |
995 | ||
996 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
997 | error = gfs2_glock_nq(&i_gh); | |
998 | if (error) { | |
999 | gfs2_holder_uninit(&i_gh); | |
1000 | return error; | |
1001 | } | |
1002 | ||
1003 | if (!ip->i_disksize) { | |
1004 | gfs2_consist_inode(ip); | |
1005 | error = -EIO; | |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1010 | if (error) | |
1011 | goto out; | |
1012 | ||
1013 | x = ip->i_disksize + 1; | |
1014 | if (x > *len) { | |
1015 | *buf = kmalloc(x, GFP_NOFS); | |
1016 | if (!*buf) { | |
1017 | error = -ENOMEM; | |
1018 | goto out_brelse; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1023 | *len = x; | |
1024 | ||
1025 | out_brelse: | |
1026 | brelse(dibh); | |
1027 | out: | |
1028 | gfs2_glock_dq_uninit(&i_gh); | |
1029 | return error; | |
1030 | } | |
1031 | ||
b3b94faa DT |
1032 | /** |
1033 | * gfs2_readlink - Read the value of a symlink | |
1034 | * @dentry: the symlink | |
1035 | * @buf: the buffer to read the symlink data into | |
1036 | * @size: the size of the buffer | |
1037 | * | |
1038 | * Returns: errno | |
1039 | */ | |
1040 | ||
1041 | static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, | |
1042 | int user_size) | |
1043 | { | |
feaa7bba | 1044 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa DT |
1045 | char array[GFS2_FAST_NAME_SIZE], *buf = array; |
1046 | unsigned int len = GFS2_FAST_NAME_SIZE; | |
1047 | int error; | |
1048 | ||
b3b94faa DT |
1049 | error = gfs2_readlinki(ip, &buf, &len); |
1050 | if (error) | |
1051 | return error; | |
1052 | ||
1053 | if (user_size > len - 1) | |
1054 | user_size = len - 1; | |
1055 | ||
1056 | if (copy_to_user(user_buf, buf, user_size)) | |
1057 | error = -EFAULT; | |
1058 | else | |
1059 | error = user_size; | |
1060 | ||
1061 | if (buf != array) | |
1062 | kfree(buf); | |
1063 | ||
1064 | return error; | |
1065 | } | |
1066 | ||
1067 | /** | |
1068 | * gfs2_follow_link - Follow a symbolic link | |
1069 | * @dentry: The dentry of the link | |
1070 | * @nd: Data that we pass to vfs_follow_link() | |
1071 | * | |
1072 | * This can handle symlinks of any size. It is optimised for symlinks | |
1073 | * under GFS2_FAST_NAME_SIZE. | |
1074 | * | |
1075 | * Returns: 0 on success or error code | |
1076 | */ | |
1077 | ||
1078 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1079 | { | |
feaa7bba | 1080 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
b3b94faa DT |
1081 | char array[GFS2_FAST_NAME_SIZE], *buf = array; |
1082 | unsigned int len = GFS2_FAST_NAME_SIZE; | |
1083 | int error; | |
1084 | ||
b3b94faa DT |
1085 | error = gfs2_readlinki(ip, &buf, &len); |
1086 | if (!error) { | |
1087 | error = vfs_follow_link(nd, buf); | |
1088 | if (buf != array) | |
1089 | kfree(buf); | |
1090 | } | |
1091 | ||
1092 | return ERR_PTR(error); | |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * gfs2_permission - | |
1097 | * @inode: | |
1098 | * @mask: | |
1099 | * @nd: passed from Linux VFS, ignored by us | |
1100 | * | |
300c7d75 SW |
1101 | * This may be called from the VFS directly, or from within GFS2 with the |
1102 | * inode locked, so we look to see if the glock is already locked and only | |
1103 | * lock the glock if its not already been done. | |
1104 | * | |
b3b94faa DT |
1105 | * Returns: errno |
1106 | */ | |
1107 | ||
f58ba889 | 1108 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1109 | { |
feaa7bba | 1110 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1111 | struct gfs2_holder i_gh; |
1112 | int error; | |
300c7d75 | 1113 | int unlock = 0; |
b3b94faa | 1114 | |
7afd88d9 | 1115 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
300c7d75 SW |
1116 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1117 | if (error) | |
1118 | return error; | |
1119 | unlock = 1; | |
1120 | } | |
b3b94faa | 1121 | |
f58ba889 MS |
1122 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1123 | error = -EACCES; | |
1124 | else | |
1125 | error = generic_permission(inode, mask, gfs2_check_acl); | |
300c7d75 | 1126 | if (unlock) |
b3b94faa | 1127 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1128 | |
1129 | return error; | |
1130 | } | |
1131 | ||
1132 | static int setattr_size(struct inode *inode, struct iattr *attr) | |
1133 | { | |
feaa7bba | 1134 | struct gfs2_inode *ip = GFS2_I(inode); |
16615be1 | 1135 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
b3b94faa DT |
1136 | int error; |
1137 | ||
c9e98886 | 1138 | if (attr->ia_size != ip->i_disksize) { |
16615be1 | 1139 | error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); |
b3b94faa DT |
1140 | if (error) |
1141 | return error; | |
16615be1 SW |
1142 | error = vmtruncate(inode, attr->ia_size); |
1143 | gfs2_trans_end(sdp); | |
1144 | if (error) | |
1145 | return error; | |
b3b94faa DT |
1146 | } |
1147 | ||
aa6a85a9 | 1148 | error = gfs2_truncatei(ip, attr->ia_size); |
c9e98886 SW |
1149 | if (error && (inode->i_size != ip->i_disksize)) |
1150 | i_size_write(inode, ip->i_disksize); | |
b3b94faa DT |
1151 | |
1152 | return error; | |
1153 | } | |
1154 | ||
1155 | static int setattr_chown(struct inode *inode, struct iattr *attr) | |
1156 | { | |
feaa7bba SW |
1157 | struct gfs2_inode *ip = GFS2_I(inode); |
1158 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 1159 | struct buffer_head *dibh; |
cd915493 | 1160 | u32 ouid, ogid, nuid, ngid; |
b3b94faa DT |
1161 | int error; |
1162 | ||
2933f925 SW |
1163 | ouid = inode->i_uid; |
1164 | ogid = inode->i_gid; | |
b3b94faa DT |
1165 | nuid = attr->ia_uid; |
1166 | ngid = attr->ia_gid; | |
1167 | ||
1168 | if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) | |
1169 | ouid = nuid = NO_QUOTA_CHANGE; | |
1170 | if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) | |
1171 | ogid = ngid = NO_QUOTA_CHANGE; | |
1172 | ||
182fe5ab CG |
1173 | if (!gfs2_alloc_get(ip)) |
1174 | return -ENOMEM; | |
b3b94faa DT |
1175 | |
1176 | error = gfs2_quota_lock(ip, nuid, ngid); | |
1177 | if (error) | |
1178 | goto out_alloc; | |
1179 | ||
1180 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
1181 | error = gfs2_quota_check(ip, nuid, ngid); | |
1182 | if (error) | |
1183 | goto out_gunlock_q; | |
1184 | } | |
1185 | ||
1186 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1187 | if (error) | |
1188 | goto out_gunlock_q; | |
1189 | ||
1190 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1191 | if (error) | |
1192 | goto out_end_trans; | |
1193 | ||
1194 | error = inode_setattr(inode, attr); | |
1195 | gfs2_assert_warn(sdp, !error); | |
b3b94faa | 1196 | |
d4e9c4c3 | 1197 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1198 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1199 | brelse(dibh); |
1200 | ||
1201 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
77658aad SW |
1202 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1203 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1204 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1205 | } |
1206 | ||
a91ea69f | 1207 | out_end_trans: |
b3b94faa | 1208 | gfs2_trans_end(sdp); |
a91ea69f | 1209 | out_gunlock_q: |
b3b94faa | 1210 | gfs2_quota_unlock(ip); |
a91ea69f | 1211 | out_alloc: |
b3b94faa | 1212 | gfs2_alloc_put(ip); |
b3b94faa DT |
1213 | return error; |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * gfs2_setattr - Change attributes on an inode | |
1218 | * @dentry: The dentry which is changing | |
1219 | * @attr: The structure describing the change | |
1220 | * | |
1221 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1222 | * that change out to disk. | |
1223 | * | |
1224 | * Returns: errno | |
1225 | */ | |
1226 | ||
1227 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1228 | { | |
1229 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1230 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1231 | struct gfs2_holder i_gh; |
1232 | int error; | |
1233 | ||
b3b94faa DT |
1234 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1235 | if (error) | |
1236 | return error; | |
1237 | ||
1238 | error = -EPERM; | |
1239 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1240 | goto out; | |
1241 | ||
1242 | error = inode_change_ok(inode, attr); | |
1243 | if (error) | |
1244 | goto out; | |
1245 | ||
1246 | if (attr->ia_valid & ATTR_SIZE) | |
1247 | error = setattr_size(inode, attr); | |
1248 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) | |
1249 | error = setattr_chown(inode, attr); | |
1250 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1251 | error = gfs2_acl_chmod(ip, attr); | |
1252 | else | |
1253 | error = gfs2_setattr_simple(ip, attr); | |
1254 | ||
a91ea69f | 1255 | out: |
b3b94faa | 1256 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1257 | if (!error) |
1258 | mark_inode_dirty(inode); | |
b3b94faa DT |
1259 | return error; |
1260 | } | |
1261 | ||
1262 | /** | |
1263 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1264 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1265 | * @dentry: The dentry to stat |
1266 | * @stat: The inode's stats | |
1267 | * | |
dcf3dd85 SW |
1268 | * This may be called from the VFS directly, or from within GFS2 with the |
1269 | * inode locked, so we look to see if the glock is already locked and only | |
1270 | * lock the glock if its not already been done. Note that its the NFS | |
1271 | * readdirplus operation which causes this to be called (from filldir) | |
1272 | * with the glock already held. | |
1273 | * | |
b3b94faa DT |
1274 | * Returns: errno |
1275 | */ | |
1276 | ||
1277 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1278 | struct kstat *stat) | |
1279 | { | |
1280 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1281 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1282 | struct gfs2_holder gh; |
1283 | int error; | |
dcf3dd85 | 1284 | int unlock = 0; |
b3b94faa | 1285 | |
7afd88d9 | 1286 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1287 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1288 | if (error) | |
1289 | return error; | |
1290 | unlock = 1; | |
b3b94faa DT |
1291 | } |
1292 | ||
dcf3dd85 | 1293 | generic_fillattr(inode, stat); |
d7c103d0 | 1294 | if (unlock) |
dcf3dd85 SW |
1295 | gfs2_glock_dq_uninit(&gh); |
1296 | ||
1297 | return 0; | |
b3b94faa DT |
1298 | } |
1299 | ||
1300 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1301 | const void *data, size_t size, int flags) | |
1302 | { | |
feaa7bba | 1303 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1304 | struct gfs2_inode *ip = GFS2_I(inode); |
1305 | struct gfs2_holder gh; | |
1306 | int ret; | |
b3b94faa | 1307 | |
40b78a32 SW |
1308 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1309 | ret = gfs2_glock_nq(&gh); | |
1310 | if (ret == 0) { | |
1311 | ret = generic_setxattr(dentry, name, data, size, flags); | |
1312 | gfs2_glock_dq(&gh); | |
1313 | } | |
1314 | gfs2_holder_uninit(&gh); | |
1315 | return ret; | |
b3b94faa DT |
1316 | } |
1317 | ||
1318 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1319 | void *data, size_t size) | |
1320 | { | |
40b78a32 SW |
1321 | struct inode *inode = dentry->d_inode; |
1322 | struct gfs2_inode *ip = GFS2_I(inode); | |
1323 | struct gfs2_holder gh; | |
1324 | int ret; | |
b3b94faa | 1325 | |
40b78a32 SW |
1326 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1327 | ret = gfs2_glock_nq(&gh); | |
1328 | if (ret == 0) { | |
1329 | ret = generic_getxattr(dentry, name, data, size); | |
1330 | gfs2_glock_dq(&gh); | |
1331 | } | |
1332 | gfs2_holder_uninit(&gh); | |
1333 | return ret; | |
b3b94faa DT |
1334 | } |
1335 | ||
1336 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1337 | { | |
40b78a32 SW |
1338 | struct inode *inode = dentry->d_inode; |
1339 | struct gfs2_inode *ip = GFS2_I(inode); | |
1340 | struct gfs2_holder gh; | |
1341 | int ret; | |
b3b94faa | 1342 | |
40b78a32 SW |
1343 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1344 | ret = gfs2_glock_nq(&gh); | |
1345 | if (ret == 0) { | |
1346 | ret = generic_removexattr(dentry, name); | |
1347 | gfs2_glock_dq(&gh); | |
1348 | } | |
1349 | gfs2_holder_uninit(&gh); | |
1350 | return ret; | |
b3b94faa DT |
1351 | } |
1352 | ||
e9079cce SW |
1353 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1354 | u64 start, u64 len) | |
1355 | { | |
1356 | struct gfs2_inode *ip = GFS2_I(inode); | |
1357 | struct gfs2_holder gh; | |
1358 | int ret; | |
1359 | ||
1360 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1361 | if (ret) | |
1362 | return ret; | |
1363 | ||
1364 | mutex_lock(&inode->i_mutex); | |
1365 | ||
1366 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1367 | if (ret) | |
1368 | goto out; | |
1369 | ||
1370 | if (gfs2_is_stuffed(ip)) { | |
1371 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1372 | u64 size = i_size_read(inode); | |
1373 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1374 | FIEMAP_EXTENT_DATA_INLINE; | |
1375 | phys += sizeof(struct gfs2_dinode); | |
1376 | phys += start; | |
1377 | if (start + len > size) | |
1378 | len = size - start; | |
1379 | if (start < size) | |
1380 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1381 | len, flags); | |
1382 | if (ret == 1) | |
1383 | ret = 0; | |
1384 | } else { | |
1385 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1386 | gfs2_block_map); | |
1387 | } | |
1388 | ||
1389 | gfs2_glock_dq_uninit(&gh); | |
1390 | out: | |
1391 | mutex_unlock(&inode->i_mutex); | |
1392 | return ret; | |
1393 | } | |
1394 | ||
92e1d5be | 1395 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1396 | .permission = gfs2_permission, |
b3b94faa DT |
1397 | .setattr = gfs2_setattr, |
1398 | .getattr = gfs2_getattr, | |
1399 | .setxattr = gfs2_setxattr, | |
1400 | .getxattr = gfs2_getxattr, | |
1401 | .listxattr = gfs2_listxattr, | |
1402 | .removexattr = gfs2_removexattr, | |
e9079cce | 1403 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1404 | }; |
1405 | ||
92e1d5be | 1406 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1407 | .create = gfs2_create, |
1408 | .lookup = gfs2_lookup, | |
1409 | .link = gfs2_link, | |
1410 | .unlink = gfs2_unlink, | |
1411 | .symlink = gfs2_symlink, | |
1412 | .mkdir = gfs2_mkdir, | |
1413 | .rmdir = gfs2_rmdir, | |
1414 | .mknod = gfs2_mknod, | |
1415 | .rename = gfs2_rename, | |
e6305c43 | 1416 | .permission = gfs2_permission, |
b3b94faa DT |
1417 | .setattr = gfs2_setattr, |
1418 | .getattr = gfs2_getattr, | |
1419 | .setxattr = gfs2_setxattr, | |
1420 | .getxattr = gfs2_getxattr, | |
1421 | .listxattr = gfs2_listxattr, | |
1422 | .removexattr = gfs2_removexattr, | |
e9079cce | 1423 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1424 | }; |
1425 | ||
92e1d5be | 1426 | const struct inode_operations gfs2_symlink_iops = { |
b3b94faa DT |
1427 | .readlink = gfs2_readlink, |
1428 | .follow_link = gfs2_follow_link, | |
e6305c43 | 1429 | .permission = gfs2_permission, |
b3b94faa DT |
1430 | .setattr = gfs2_setattr, |
1431 | .getattr = gfs2_getattr, | |
1432 | .setxattr = gfs2_setxattr, | |
1433 | .getxattr = gfs2_getxattr, | |
1434 | .listxattr = gfs2_listxattr, | |
1435 | .removexattr = gfs2_removexattr, | |
e9079cce | 1436 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1437 | }; |
1438 |