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> | |
b3b94faa DT |
15 | #include <linux/mm.h> |
16 | #include <linux/xattr.h> | |
17 | #include <linux/posix_acl.h> | |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 19 | #include <linux/crc32.h> |
e9079cce | 20 | #include <linux/fiemap.h> |
b3b94faa DT |
21 | #include <asm/uaccess.h> |
22 | ||
23 | #include "gfs2.h" | |
5c676f6d | 24 | #include "incore.h" |
b3b94faa DT |
25 | #include "acl.h" |
26 | #include "bmap.h" | |
27 | #include "dir.h" | |
307cf6e6 | 28 | #include "xattr.h" |
b3b94faa DT |
29 | #include "glock.h" |
30 | #include "inode.h" | |
31 | #include "meta_io.h" | |
b3b94faa DT |
32 | #include "quota.h" |
33 | #include "rgrp.h" | |
34 | #include "trans.h" | |
5c676f6d | 35 | #include "util.h" |
b2760583 | 36 | #include "super.h" |
b3b94faa DT |
37 | |
38 | /** | |
39 | * gfs2_create - Create a file | |
40 | * @dir: The directory in which to create the file | |
41 | * @dentry: The dentry of the new file | |
42 | * @mode: The mode of the new file | |
43 | * | |
44 | * Returns: errno | |
45 | */ | |
46 | ||
47 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
48 | int mode, struct nameidata *nd) | |
49 | { | |
feaa7bba SW |
50 | struct gfs2_inode *dip = GFS2_I(dir); |
51 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
52 | struct gfs2_holder ghs[2]; |
53 | struct inode *inode; | |
b3b94faa | 54 | |
b3b94faa DT |
55 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
56 | ||
57 | for (;;) { | |
e7f14f4d | 58 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); |
7359a19c | 59 | if (!IS_ERR(inode)) { |
b3b94faa | 60 | gfs2_trans_end(sdp); |
6dbd8224 | 61 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
62 | gfs2_inplace_release(dip); |
63 | gfs2_quota_unlock(dip); | |
64 | gfs2_alloc_put(dip); | |
65 | gfs2_glock_dq_uninit_m(2, ghs); | |
3a8476dd | 66 | mark_inode_dirty(inode); |
b3b94faa | 67 | break; |
7359a19c | 68 | } else if (PTR_ERR(inode) != -EEXIST || |
3516586a | 69 | (nd && nd->flags & LOOKUP_EXCL)) { |
b3b94faa | 70 | gfs2_holder_uninit(ghs); |
7359a19c | 71 | return PTR_ERR(inode); |
b3b94faa DT |
72 | } |
73 | ||
a569c711 | 74 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c SW |
75 | if (inode) { |
76 | if (!IS_ERR(inode)) { | |
c752666c SW |
77 | gfs2_holder_uninit(ghs); |
78 | break; | |
79 | } else { | |
80 | gfs2_holder_uninit(ghs); | |
81 | return PTR_ERR(inode); | |
82 | } | |
b3b94faa DT |
83 | } |
84 | } | |
85 | ||
b3b94faa | 86 | d_instantiate(dentry, inode); |
b3b94faa DT |
87 | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /** | |
92 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
93 | * @dir: The directory inode | |
94 | * @dentry: The dentry of the new inode | |
95 | * @nd: passed from Linux VFS, ignored by us | |
96 | * | |
97 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
98 | * | |
99 | * Returns: errno | |
100 | */ | |
101 | ||
102 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
103 | struct nameidata *nd) | |
104 | { | |
b3b94faa | 105 | struct inode *inode = NULL; |
b3b94faa | 106 | |
a569c711 | 107 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
c752666c | 108 | if (inode && IS_ERR(inode)) |
e231c2ee | 109 | return ERR_CAST(inode); |
b3b94faa | 110 | |
9656b2c1 SW |
111 | if (inode) { |
112 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; | |
113 | struct gfs2_holder gh; | |
114 | int error; | |
115 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
116 | if (error) { | |
117 | iput(inode); | |
118 | return ERR_PTR(error); | |
119 | } | |
120 | gfs2_glock_dq_uninit(&gh); | |
b3b94faa | 121 | return d_splice_alias(inode, dentry); |
9656b2c1 | 122 | } |
b3b94faa DT |
123 | d_add(dentry, inode); |
124 | ||
125 | return NULL; | |
126 | } | |
127 | ||
128 | /** | |
129 | * gfs2_link - Link to a file | |
130 | * @old_dentry: The inode to link | |
131 | * @dir: Add link to this directory | |
132 | * @dentry: The name of the link | |
133 | * | |
134 | * Link the inode in "old_dentry" into the directory "dir" with the | |
135 | * name in "dentry". | |
136 | * | |
137 | * Returns: errno | |
138 | */ | |
139 | ||
140 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
141 | struct dentry *dentry) | |
142 | { | |
feaa7bba SW |
143 | struct gfs2_inode *dip = GFS2_I(dir); |
144 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 145 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 146 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
147 | struct gfs2_holder ghs[2]; |
148 | int alloc_required; | |
149 | int error; | |
150 | ||
b60623c2 | 151 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
152 | return -EPERM; |
153 | ||
154 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); | |
155 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
156 | ||
72dbf479 BP |
157 | error = gfs2_glock_nq(ghs); /* parent */ |
158 | if (error) | |
159 | goto out_parent; | |
160 | ||
161 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 162 | if (error) |
72dbf479 | 163 | goto out_child; |
b3b94faa | 164 | |
b74c79e9 | 165 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0); |
b3b94faa DT |
166 | if (error) |
167 | goto out_gunlock; | |
168 | ||
dbb7cae2 | 169 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
170 | switch (error) { |
171 | case -ENOENT: | |
172 | break; | |
173 | case 0: | |
174 | error = -EEXIST; | |
175 | default: | |
176 | goto out_gunlock; | |
177 | } | |
178 | ||
179 | error = -EINVAL; | |
4f56110a | 180 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
181 | goto out_gunlock; |
182 | error = -EFBIG; | |
ad6203f2 | 183 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
184 | goto out_gunlock; |
185 | error = -EPERM; | |
186 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
187 | goto out_gunlock; | |
188 | error = -EINVAL; | |
4f56110a | 189 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
190 | goto out_gunlock; |
191 | error = -EMLINK; | |
4f56110a | 192 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
193 | goto out_gunlock; |
194 | ||
c752666c SW |
195 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
196 | if (error < 0) | |
b3b94faa | 197 | goto out_gunlock; |
c752666c | 198 | error = 0; |
b3b94faa DT |
199 | |
200 | if (alloc_required) { | |
201 | struct gfs2_alloc *al = gfs2_alloc_get(dip); | |
182fe5ab CG |
202 | if (!al) { |
203 | error = -ENOMEM; | |
204 | goto out_gunlock; | |
205 | } | |
b3b94faa | 206 | |
d82661d9 | 207 | error = gfs2_quota_lock_check(dip); |
b3b94faa DT |
208 | if (error) |
209 | goto out_alloc; | |
210 | ||
b3b94faa DT |
211 | al->al_requested = sdp->sd_max_dirres; |
212 | ||
213 | error = gfs2_inplace_reserve(dip); | |
214 | if (error) | |
215 | goto out_gunlock_q; | |
216 | ||
1b50259b | 217 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bf97b673 | 218 | gfs2_rg_blocks(al) + |
b3b94faa DT |
219 | 2 * RES_DINODE + RES_STATFS + |
220 | RES_QUOTA, 0); | |
221 | if (error) | |
222 | goto out_ipres; | |
223 | } else { | |
224 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
225 | if (error) | |
226 | goto out_ipres; | |
227 | } | |
228 | ||
dbb7cae2 | 229 | error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode)); |
b3b94faa DT |
230 | if (error) |
231 | goto out_end_trans; | |
232 | ||
233 | error = gfs2_change_nlink(ip, +1); | |
234 | ||
feaa7bba | 235 | out_end_trans: |
b3b94faa | 236 | gfs2_trans_end(sdp); |
feaa7bba | 237 | out_ipres: |
b3b94faa DT |
238 | if (alloc_required) |
239 | gfs2_inplace_release(dip); | |
feaa7bba | 240 | out_gunlock_q: |
b3b94faa DT |
241 | if (alloc_required) |
242 | gfs2_quota_unlock(dip); | |
feaa7bba | 243 | out_alloc: |
b3b94faa DT |
244 | if (alloc_required) |
245 | gfs2_alloc_put(dip); | |
feaa7bba | 246 | out_gunlock: |
72dbf479 BP |
247 | gfs2_glock_dq(ghs + 1); |
248 | out_child: | |
249 | gfs2_glock_dq(ghs); | |
250 | out_parent: | |
b3b94faa DT |
251 | gfs2_holder_uninit(ghs); |
252 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa | 253 | if (!error) { |
7de9c6ee | 254 | ihold(inode); |
b3b94faa DT |
255 | d_instantiate(dentry, inode); |
256 | mark_inode_dirty(inode); | |
257 | } | |
b3b94faa DT |
258 | return error; |
259 | } | |
260 | ||
87ec2174 SW |
261 | /* |
262 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
263 | * @dip: the directory | |
264 | * @name: the name of the file | |
265 | * @ip: the inode | |
266 | * | |
267 | * Assumes that the lock on (at least) @dip is held. | |
268 | * | |
269 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
270 | */ | |
271 | ||
272 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
273 | const struct gfs2_inode *ip) | |
274 | { | |
275 | int error; | |
276 | ||
277 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
278 | return -EPERM; | |
279 | ||
280 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
281 | dip->i_inode.i_uid != current_fsuid() && | |
282 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) | |
283 | return -EPERM; | |
284 | ||
285 | if (IS_APPEND(&dip->i_inode)) | |
286 | return -EPERM; | |
287 | ||
b74c79e9 | 288 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); |
87ec2174 SW |
289 | if (error) |
290 | return error; | |
291 | ||
292 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
293 | if (error) | |
294 | return error; | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
b3b94faa DT |
299 | /** |
300 | * gfs2_unlink - Unlink a file | |
301 | * @dir: The inode of the directory containing the file to unlink | |
302 | * @dentry: The file itself | |
303 | * | |
304 | * Unlink a file. Call gfs2_unlinki() | |
305 | * | |
306 | * Returns: errno | |
307 | */ | |
308 | ||
309 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
310 | { | |
feaa7bba SW |
311 | struct gfs2_inode *dip = GFS2_I(dir); |
312 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
313 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
314 | struct gfs2_holder ghs[3]; |
315 | struct gfs2_rgrpd *rgd; | |
316 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
317 | int error; |
318 | ||
ddee7608 RC |
319 | error = gfs2_rindex_hold(sdp, &ri_gh); |
320 | if (error) | |
321 | return error; | |
322 | ||
b3b94faa | 323 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 324 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 325 | |
dbb7cae2 | 326 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
327 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
328 | ||
329 | ||
8497a46e | 330 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 331 | if (error) |
8497a46e SW |
332 | goto out_parent; |
333 | ||
334 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
335 | if (error) | |
336 | goto out_child; | |
337 | ||
338 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
339 | if (error) | |
340 | goto out_rgrp; | |
b3b94faa DT |
341 | |
342 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
343 | if (error) | |
72dbf479 | 344 | goto out_gunlock; |
b3b94faa | 345 | |
feaa7bba | 346 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0); |
b3b94faa | 347 | if (error) |
cd012075 | 348 | goto out_gunlock; |
b3b94faa | 349 | |
feaa7bba SW |
350 | error = gfs2_dir_del(dip, &dentry->d_name); |
351 | if (error) | |
352 | goto out_end_trans; | |
b3b94faa | 353 | |
feaa7bba | 354 | error = gfs2_change_nlink(ip, -1); |
b3b94faa | 355 | |
feaa7bba SW |
356 | out_end_trans: |
357 | gfs2_trans_end(sdp); | |
72dbf479 | 358 | out_gunlock: |
8497a46e SW |
359 | gfs2_glock_dq(ghs + 2); |
360 | out_rgrp: | |
ddee7608 | 361 | gfs2_holder_uninit(ghs + 2); |
8497a46e SW |
362 | gfs2_glock_dq(ghs + 1); |
363 | out_child: | |
364 | gfs2_holder_uninit(ghs + 1); | |
365 | gfs2_glock_dq(ghs); | |
366 | out_parent: | |
367 | gfs2_holder_uninit(ghs); | |
ddee7608 | 368 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
369 | return error; |
370 | } | |
371 | ||
372 | /** | |
373 | * gfs2_symlink - Create a symlink | |
374 | * @dir: The directory to create the symlink in | |
375 | * @dentry: The dentry to put the symlink in | |
376 | * @symname: The thing which the link points to | |
377 | * | |
378 | * Returns: errno | |
379 | */ | |
380 | ||
381 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
382 | const char *symname) | |
383 | { | |
feaa7bba SW |
384 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
385 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
386 | struct gfs2_holder ghs[2]; |
387 | struct inode *inode; | |
388 | struct buffer_head *dibh; | |
389 | int size; | |
390 | int error; | |
391 | ||
b3b94faa DT |
392 | /* Must be stuffed with a null terminator for gfs2_follow_link() */ |
393 | size = strlen(symname); | |
394 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
395 | return -ENAMETOOLONG; | |
396 | ||
397 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
398 | ||
e7f14f4d | 399 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); |
7359a19c | 400 | if (IS_ERR(inode)) { |
b3b94faa | 401 | gfs2_holder_uninit(ghs); |
7359a19c | 402 | return PTR_ERR(inode); |
b3b94faa DT |
403 | } |
404 | ||
5c676f6d | 405 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 406 | |
5cf32524 | 407 | i_size_write(inode, size); |
b3b94faa DT |
408 | |
409 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
410 | ||
411 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
539e5d6b | 412 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
413 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, |
414 | size); | |
415 | brelse(dibh); | |
416 | } | |
417 | ||
418 | gfs2_trans_end(sdp); | |
6dbd8224 | 419 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
420 | gfs2_inplace_release(dip); |
421 | gfs2_quota_unlock(dip); | |
422 | gfs2_alloc_put(dip); | |
423 | ||
424 | gfs2_glock_dq_uninit_m(2, ghs); | |
425 | ||
b3b94faa DT |
426 | d_instantiate(dentry, inode); |
427 | mark_inode_dirty(inode); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | /** | |
433 | * gfs2_mkdir - Make a directory | |
434 | * @dir: The parent directory of the new one | |
435 | * @dentry: The dentry of the new directory | |
436 | * @mode: The mode of the new directory | |
437 | * | |
438 | * Returns: errno | |
439 | */ | |
440 | ||
441 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
442 | { | |
feaa7bba SW |
443 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
444 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa DT |
445 | struct gfs2_holder ghs[2]; |
446 | struct inode *inode; | |
447 | struct buffer_head *dibh; | |
448 | int error; | |
449 | ||
b3b94faa DT |
450 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
451 | ||
e7f14f4d | 452 | inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); |
7359a19c | 453 | if (IS_ERR(inode)) { |
b3b94faa | 454 | gfs2_holder_uninit(ghs); |
7359a19c | 455 | return PTR_ERR(inode); |
b3b94faa DT |
456 | } |
457 | ||
5c676f6d | 458 | ip = ghs[1].gh_gl->gl_object; |
b3b94faa | 459 | |
4f56110a | 460 | ip->i_inode.i_nlink = 2; |
a2e0f799 | 461 | i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); |
383f01fb | 462 | ip->i_diskflags |= GFS2_DIF_JDATA; |
ad6203f2 | 463 | ip->i_entries = 2; |
b3b94faa DT |
464 | |
465 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
466 | ||
467 | if (!gfs2_assert_withdraw(sdp, !error)) { | |
468 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
c752666c | 469 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); |
b3b94faa | 470 | |
c752666c | 471 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
8d123585 | 472 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); |
b3b94faa | 473 | dent->de_inum = di->di_num; /* already GFS2 endian */ |
7ecdb70a | 474 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa DT |
475 | di->di_entries = cpu_to_be32(1); |
476 | ||
c752666c | 477 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); |
8d123585 | 478 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); |
b3b94faa | 479 | |
dbb7cae2 | 480 | gfs2_inum_out(dip, dent); |
7ecdb70a | 481 | dent->de_type = cpu_to_be16(DT_DIR); |
b3b94faa | 482 | |
539e5d6b | 483 | gfs2_dinode_out(ip, di); |
b3b94faa DT |
484 | |
485 | brelse(dibh); | |
486 | } | |
487 | ||
488 | error = gfs2_change_nlink(dip, +1); | |
489 | gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ | |
490 | ||
491 | gfs2_trans_end(sdp); | |
6dbd8224 | 492 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
493 | gfs2_inplace_release(dip); |
494 | gfs2_quota_unlock(dip); | |
495 | gfs2_alloc_put(dip); | |
496 | ||
497 | gfs2_glock_dq_uninit_m(2, ghs); | |
498 | ||
b3b94faa DT |
499 | d_instantiate(dentry, inode); |
500 | mark_inode_dirty(inode); | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
2286dbfa SW |
505 | /** |
506 | * gfs2_rmdiri - Remove a directory | |
507 | * @dip: The parent directory of the directory to be removed | |
508 | * @name: The name of the directory to be removed | |
509 | * @ip: The GFS2 inode of the directory to be removed | |
510 | * | |
511 | * Assumes Glocks on dip and ip are held | |
512 | * | |
513 | * Returns: errno | |
514 | */ | |
515 | ||
516 | static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, | |
517 | struct gfs2_inode *ip) | |
518 | { | |
2286dbfa SW |
519 | int error; |
520 | ||
521 | if (ip->i_entries != 2) { | |
522 | if (gfs2_consist_inode(ip)) | |
523 | gfs2_dinode_print(ip); | |
524 | return -EIO; | |
525 | } | |
526 | ||
527 | error = gfs2_dir_del(dip, name); | |
528 | if (error) | |
529 | return error; | |
530 | ||
531 | error = gfs2_change_nlink(dip, -1); | |
532 | if (error) | |
533 | return error; | |
534 | ||
8d123585 | 535 | error = gfs2_dir_del(ip, &gfs2_qdot); |
2286dbfa SW |
536 | if (error) |
537 | return error; | |
538 | ||
8d123585 | 539 | error = gfs2_dir_del(ip, &gfs2_qdotdot); |
2286dbfa SW |
540 | if (error) |
541 | return error; | |
542 | ||
543 | /* It looks odd, but it really should be done twice */ | |
544 | error = gfs2_change_nlink(ip, -1); | |
545 | if (error) | |
546 | return error; | |
547 | ||
548 | error = gfs2_change_nlink(ip, -1); | |
549 | if (error) | |
550 | return error; | |
551 | ||
552 | return error; | |
553 | } | |
554 | ||
b3b94faa DT |
555 | /** |
556 | * gfs2_rmdir - Remove a directory | |
557 | * @dir: The parent directory of the directory to be removed | |
558 | * @dentry: The dentry of the directory to remove | |
559 | * | |
560 | * Remove a directory. Call gfs2_rmdiri() | |
561 | * | |
562 | * Returns: errno | |
563 | */ | |
564 | ||
565 | static int gfs2_rmdir(struct inode *dir, struct dentry *dentry) | |
566 | { | |
feaa7bba SW |
567 | struct gfs2_inode *dip = GFS2_I(dir); |
568 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
569 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); | |
ddee7608 RC |
570 | struct gfs2_holder ghs[3]; |
571 | struct gfs2_rgrpd *rgd; | |
572 | struct gfs2_holder ri_gh; | |
b3b94faa DT |
573 | int error; |
574 | ||
ddee7608 RC |
575 | error = gfs2_rindex_hold(sdp, &ri_gh); |
576 | if (error) | |
577 | return error; | |
b3b94faa DT |
578 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
579 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
580 | ||
dbb7cae2 | 581 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
ddee7608 RC |
582 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
583 | ||
72dbf479 BP |
584 | error = gfs2_glock_nq(ghs); /* parent */ |
585 | if (error) | |
586 | goto out_parent; | |
587 | ||
588 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 589 | if (error) |
72dbf479 BP |
590 | goto out_child; |
591 | ||
592 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ | |
593 | if (error) | |
594 | goto out_rgrp; | |
b3b94faa DT |
595 | |
596 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
597 | if (error) | |
598 | goto out_gunlock; | |
599 | ||
ad6203f2 | 600 | if (ip->i_entries < 2) { |
b3b94faa | 601 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 602 | gfs2_dinode_print(ip); |
b3b94faa DT |
603 | error = -EIO; |
604 | goto out_gunlock; | |
605 | } | |
ad6203f2 | 606 | if (ip->i_entries > 2) { |
b3b94faa DT |
607 | error = -ENOTEMPTY; |
608 | goto out_gunlock; | |
609 | } | |
610 | ||
feaa7bba | 611 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0); |
b3b94faa DT |
612 | if (error) |
613 | goto out_gunlock; | |
614 | ||
feaa7bba | 615 | error = gfs2_rmdiri(dip, &dentry->d_name, ip); |
b3b94faa DT |
616 | |
617 | gfs2_trans_end(sdp); | |
618 | ||
a91ea69f | 619 | out_gunlock: |
72dbf479 BP |
620 | gfs2_glock_dq(ghs + 2); |
621 | out_rgrp: | |
ddee7608 | 622 | gfs2_holder_uninit(ghs + 2); |
72dbf479 BP |
623 | gfs2_glock_dq(ghs + 1); |
624 | out_child: | |
625 | gfs2_holder_uninit(ghs + 1); | |
626 | gfs2_glock_dq(ghs); | |
627 | out_parent: | |
628 | gfs2_holder_uninit(ghs); | |
ddee7608 | 629 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
630 | return error; |
631 | } | |
632 | ||
633 | /** | |
634 | * gfs2_mknod - Make a special file | |
635 | * @dir: The directory in which the special file will reside | |
636 | * @dentry: The dentry of the special file | |
637 | * @mode: The mode of the special file | |
638 | * @rdev: The device specification of the special file | |
639 | * | |
640 | */ | |
641 | ||
642 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
643 | dev_t dev) | |
644 | { | |
e7f14f4d | 645 | struct gfs2_inode *dip = GFS2_I(dir); |
feaa7bba | 646 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
b3b94faa DT |
647 | struct gfs2_holder ghs[2]; |
648 | struct inode *inode; | |
b3b94faa DT |
649 | |
650 | gfs2_holder_init(dip->i_gl, 0, 0, ghs); | |
651 | ||
e7f14f4d | 652 | inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); |
7359a19c | 653 | if (IS_ERR(inode)) { |
b3b94faa | 654 | gfs2_holder_uninit(ghs); |
7359a19c | 655 | return PTR_ERR(inode); |
b3b94faa DT |
656 | } |
657 | ||
b3b94faa | 658 | gfs2_trans_end(sdp); |
6dbd8224 | 659 | if (dip->i_alloc->al_rgd) |
b3b94faa DT |
660 | gfs2_inplace_release(dip); |
661 | gfs2_quota_unlock(dip); | |
662 | gfs2_alloc_put(dip); | |
663 | ||
664 | gfs2_glock_dq_uninit_m(2, ghs); | |
665 | ||
b3b94faa DT |
666 | d_instantiate(dentry, inode); |
667 | mark_inode_dirty(inode); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
0188d6c5 SW |
672 | /* |
673 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
674 | * @this: move this | |
675 | * @to: to here | |
676 | * | |
677 | * Follow @to back to the root and make sure we don't encounter @this | |
678 | * Assumes we already hold the rename lock. | |
679 | * | |
680 | * Returns: errno | |
681 | */ | |
682 | ||
683 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
684 | { | |
685 | struct inode *dir = &to->i_inode; | |
686 | struct super_block *sb = dir->i_sb; | |
687 | struct inode *tmp; | |
0188d6c5 SW |
688 | int error = 0; |
689 | ||
0188d6c5 SW |
690 | igrab(dir); |
691 | ||
692 | for (;;) { | |
693 | if (dir == &this->i_inode) { | |
694 | error = -EINVAL; | |
695 | break; | |
696 | } | |
697 | if (dir == sb->s_root->d_inode) { | |
698 | error = 0; | |
699 | break; | |
700 | } | |
701 | ||
8d123585 | 702 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
703 | if (IS_ERR(tmp)) { |
704 | error = PTR_ERR(tmp); | |
705 | break; | |
706 | } | |
707 | ||
708 | iput(dir); | |
709 | dir = tmp; | |
710 | } | |
711 | ||
712 | iput(dir); | |
713 | ||
714 | return error; | |
715 | } | |
716 | ||
b3b94faa DT |
717 | /** |
718 | * gfs2_rename - Rename a file | |
719 | * @odir: Parent directory of old file name | |
720 | * @odentry: The old dentry of the file | |
721 | * @ndir: Parent directory of new file name | |
722 | * @ndentry: The new dentry of the file | |
723 | * | |
724 | * Returns: errno | |
725 | */ | |
726 | ||
727 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
728 | struct inode *ndir, struct dentry *ndentry) | |
729 | { | |
feaa7bba SW |
730 | struct gfs2_inode *odip = GFS2_I(odir); |
731 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
732 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 733 | struct gfs2_inode *nip = NULL; |
feaa7bba | 734 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
46290341 | 735 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; |
ddee7608 | 736 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
737 | unsigned int num_gh; |
738 | int dir_rename = 0; | |
24b977b5 | 739 | int alloc_required = 0; |
b3b94faa DT |
740 | unsigned int x; |
741 | int error; | |
742 | ||
b3b94faa | 743 | if (ndentry->d_inode) { |
feaa7bba | 744 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
745 | if (ip == nip) |
746 | return 0; | |
747 | } | |
748 | ||
46290341 BP |
749 | error = gfs2_rindex_hold(sdp, &ri_gh); |
750 | if (error) | |
751 | return error; | |
b3b94faa | 752 | |
0188d6c5 SW |
753 | if (odip != ndip) { |
754 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
755 | 0, &r_gh); | |
b3b94faa DT |
756 | if (error) |
757 | goto out; | |
758 | ||
0188d6c5 SW |
759 | if (S_ISDIR(ip->i_inode.i_mode)) { |
760 | dir_rename = 1; | |
761 | /* don't move a dirctory into it's subdir */ | |
762 | error = gfs2_ok_to_move(ip, ndip); | |
763 | if (error) | |
764 | goto out_gunlock_r; | |
765 | } | |
b3b94faa DT |
766 | } |
767 | ||
d9d1ca30 | 768 | num_gh = 1; |
b3b94faa | 769 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
770 | if (odip != ndip) { |
771 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
772 | num_gh++; | |
773 | } | |
774 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
775 | num_gh++; | |
b3b94faa | 776 | |
d9d1ca30 SW |
777 | if (nip) { |
778 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
779 | num_gh++; | |
ddee7608 RC |
780 | /* grab the resource lock for unlink flag twiddling |
781 | * this is the case of the target file already existing | |
782 | * so we unlink before doing the rename | |
783 | */ | |
dbb7cae2 | 784 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); |
ddee7608 RC |
785 | if (nrgd) |
786 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 787 | } |
b3b94faa | 788 | |
72dbf479 BP |
789 | for (x = 0; x < num_gh; x++) { |
790 | error = gfs2_glock_nq(ghs + x); | |
791 | if (error) | |
792 | goto out_gunlock; | |
793 | } | |
b3b94faa DT |
794 | |
795 | /* Check out the old directory */ | |
796 | ||
797 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
798 | if (error) | |
799 | goto out_gunlock; | |
800 | ||
801 | /* Check out the new directory */ | |
802 | ||
803 | if (nip) { | |
804 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
805 | if (error) | |
806 | goto out_gunlock; | |
807 | ||
b60623c2 | 808 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 809 | if (nip->i_entries < 2) { |
b3b94faa | 810 | if (gfs2_consist_inode(nip)) |
4cc14f0b | 811 | gfs2_dinode_print(nip); |
b3b94faa DT |
812 | error = -EIO; |
813 | goto out_gunlock; | |
814 | } | |
ad6203f2 | 815 | if (nip->i_entries > 2) { |
b3b94faa DT |
816 | error = -ENOTEMPTY; |
817 | goto out_gunlock; | |
818 | } | |
819 | } | |
820 | } else { | |
b74c79e9 | 821 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0); |
b3b94faa DT |
822 | if (error) |
823 | goto out_gunlock; | |
824 | ||
dbb7cae2 | 825 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
826 | switch (error) { |
827 | case -ENOENT: | |
828 | error = 0; | |
829 | break; | |
830 | case 0: | |
831 | error = -EEXIST; | |
832 | default: | |
833 | goto out_gunlock; | |
834 | }; | |
835 | ||
836 | if (odip != ndip) { | |
4f56110a | 837 | if (!ndip->i_inode.i_nlink) { |
b3b94faa DT |
838 | error = -EINVAL; |
839 | goto out_gunlock; | |
840 | } | |
ad6203f2 | 841 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
842 | error = -EFBIG; |
843 | goto out_gunlock; | |
844 | } | |
b60623c2 | 845 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 846 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
847 | error = -EMLINK; |
848 | goto out_gunlock; | |
849 | } | |
850 | } | |
851 | } | |
852 | ||
853 | /* Check out the dir to be renamed */ | |
854 | ||
855 | if (dir_rename) { | |
b74c79e9 | 856 | error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0); |
b3b94faa DT |
857 | if (error) |
858 | goto out_gunlock; | |
859 | } | |
860 | ||
24b977b5 SW |
861 | if (nip == NULL) |
862 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
863 | error = alloc_required; | |
c752666c | 864 | if (error < 0) |
b3b94faa | 865 | goto out_gunlock; |
c752666c | 866 | error = 0; |
b3b94faa DT |
867 | |
868 | if (alloc_required) { | |
869 | struct gfs2_alloc *al = gfs2_alloc_get(ndip); | |
182fe5ab CG |
870 | if (!al) { |
871 | error = -ENOMEM; | |
872 | goto out_gunlock; | |
873 | } | |
b3b94faa | 874 | |
d82661d9 | 875 | error = gfs2_quota_lock_check(ndip); |
b3b94faa DT |
876 | if (error) |
877 | goto out_alloc; | |
878 | ||
b3b94faa DT |
879 | al->al_requested = sdp->sd_max_dirres; |
880 | ||
46290341 | 881 | error = gfs2_inplace_reserve_ri(ndip); |
b3b94faa DT |
882 | if (error) |
883 | goto out_gunlock_q; | |
884 | ||
fe1bdedc | 885 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bf97b673 | 886 | gfs2_rg_blocks(al) + |
b3b94faa | 887 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 888 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
889 | if (error) |
890 | goto out_ipreserv; | |
891 | } else { | |
892 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 893 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
894 | if (error) |
895 | goto out_gunlock; | |
896 | } | |
897 | ||
898 | /* Remove the target file, if it exists */ | |
899 | ||
900 | if (nip) { | |
b60623c2 | 901 | if (S_ISDIR(nip->i_inode.i_mode)) |
feaa7bba SW |
902 | error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); |
903 | else { | |
904 | error = gfs2_dir_del(ndip, &ndentry->d_name); | |
905 | if (error) | |
906 | goto out_end_trans; | |
87d21e07 | 907 | error = gfs2_change_nlink(nip, -1); |
feaa7bba | 908 | } |
b3b94faa DT |
909 | if (error) |
910 | goto out_end_trans; | |
911 | } | |
912 | ||
913 | if (dir_rename) { | |
b3b94faa DT |
914 | error = gfs2_change_nlink(ndip, +1); |
915 | if (error) | |
916 | goto out_end_trans; | |
917 | error = gfs2_change_nlink(odip, -1); | |
918 | if (error) | |
919 | goto out_end_trans; | |
920 | ||
8d123585 | 921 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
922 | if (error) |
923 | goto out_end_trans; | |
924 | } else { | |
925 | struct buffer_head *dibh; | |
926 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
927 | if (error) | |
928 | goto out_end_trans; | |
4bd91ba1 | 929 | ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 930 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 931 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
932 | brelse(dibh); |
933 | } | |
934 | ||
935 | error = gfs2_dir_del(odip, &odentry->d_name); | |
936 | if (error) | |
937 | goto out_end_trans; | |
938 | ||
dbb7cae2 | 939 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
940 | if (error) |
941 | goto out_end_trans; | |
942 | ||
feaa7bba | 943 | out_end_trans: |
b3b94faa | 944 | gfs2_trans_end(sdp); |
feaa7bba | 945 | out_ipreserv: |
b3b94faa DT |
946 | if (alloc_required) |
947 | gfs2_inplace_release(ndip); | |
feaa7bba | 948 | out_gunlock_q: |
b3b94faa DT |
949 | if (alloc_required) |
950 | gfs2_quota_unlock(ndip); | |
feaa7bba | 951 | out_alloc: |
b3b94faa DT |
952 | if (alloc_required) |
953 | gfs2_alloc_put(ndip); | |
feaa7bba | 954 | out_gunlock: |
72dbf479 BP |
955 | while (x--) { |
956 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 957 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 958 | } |
feaa7bba | 959 | out_gunlock_r: |
0188d6c5 | 960 | if (r_gh.gh_gl) |
b3b94faa | 961 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 962 | out: |
46290341 | 963 | gfs2_glock_dq_uninit(&ri_gh); |
b3b94faa DT |
964 | return error; |
965 | } | |
966 | ||
536baf02 | 967 | /** |
c177c2ac AV |
968 | * gfs2_follow_link - Follow a symbolic link |
969 | * @dentry: The dentry of the link | |
970 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 971 | * |
c177c2ac | 972 | * This can handle symlinks of any size. |
536baf02 | 973 | * |
c177c2ac | 974 | * Returns: 0 on success or error code |
536baf02 SW |
975 | */ |
976 | ||
c177c2ac | 977 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 978 | { |
c177c2ac | 979 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
980 | struct gfs2_holder i_gh; |
981 | struct buffer_head *dibh; | |
a2e0f799 | 982 | unsigned int x, size; |
c177c2ac | 983 | char *buf; |
536baf02 SW |
984 | int error; |
985 | ||
986 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
987 | error = gfs2_glock_nq(&i_gh); | |
988 | if (error) { | |
989 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
990 | nd_set_link(nd, ERR_PTR(error)); |
991 | return NULL; | |
536baf02 SW |
992 | } |
993 | ||
a2e0f799 SW |
994 | size = (unsigned int)i_size_read(&ip->i_inode); |
995 | if (size == 0) { | |
536baf02 | 996 | gfs2_consist_inode(ip); |
c177c2ac | 997 | buf = ERR_PTR(-EIO); |
536baf02 SW |
998 | goto out; |
999 | } | |
1000 | ||
1001 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1002 | if (error) { |
1003 | buf = ERR_PTR(error); | |
536baf02 | 1004 | goto out; |
536baf02 SW |
1005 | } |
1006 | ||
a2e0f799 | 1007 | x = size + 1; |
c177c2ac AV |
1008 | buf = kmalloc(x, GFP_NOFS); |
1009 | if (!buf) | |
1010 | buf = ERR_PTR(-ENOMEM); | |
1011 | else | |
1012 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
536baf02 SW |
1013 | brelse(dibh); |
1014 | out: | |
1015 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1016 | nd_set_link(nd, buf); |
1017 | return NULL; | |
b3b94faa DT |
1018 | } |
1019 | ||
c177c2ac | 1020 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1021 | { |
c177c2ac AV |
1022 | char *s = nd_get_link(nd); |
1023 | if (!IS_ERR(s)) | |
1024 | kfree(s); | |
b3b94faa DT |
1025 | } |
1026 | ||
1027 | /** | |
1028 | * gfs2_permission - | |
1029 | * @inode: | |
1030 | * @mask: | |
1031 | * @nd: passed from Linux VFS, ignored by us | |
1032 | * | |
300c7d75 SW |
1033 | * This may be called from the VFS directly, or from within GFS2 with the |
1034 | * inode locked, so we look to see if the glock is already locked and only | |
1035 | * lock the glock if its not already been done. | |
1036 | * | |
b3b94faa DT |
1037 | * Returns: errno |
1038 | */ | |
1039 | ||
b74c79e9 | 1040 | int gfs2_permission(struct inode *inode, int mask, unsigned int flags) |
b3b94faa | 1041 | { |
b74c79e9 | 1042 | struct gfs2_inode *ip; |
b3b94faa DT |
1043 | struct gfs2_holder i_gh; |
1044 | int error; | |
300c7d75 | 1045 | int unlock = 0; |
b3b94faa | 1046 | |
b74c79e9 NP |
1047 | if (flags & IPERM_FLAG_RCU) |
1048 | return -ECHILD; | |
1049 | ||
1050 | ip = GFS2_I(inode); | |
7afd88d9 | 1051 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
300c7d75 SW |
1052 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1053 | if (error) | |
1054 | return error; | |
1055 | unlock = 1; | |
1056 | } | |
b3b94faa | 1057 | |
f58ba889 MS |
1058 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1059 | error = -EACCES; | |
1060 | else | |
b74c79e9 | 1061 | error = generic_permission(inode, mask, flags, gfs2_check_acl); |
300c7d75 | 1062 | if (unlock) |
b3b94faa | 1063 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1064 | |
1065 | return error; | |
1066 | } | |
1067 | ||
b3b94faa DT |
1068 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1069 | { | |
feaa7bba SW |
1070 | struct gfs2_inode *ip = GFS2_I(inode); |
1071 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
cd915493 | 1072 | u32 ouid, ogid, nuid, ngid; |
b3b94faa DT |
1073 | int error; |
1074 | ||
2933f925 SW |
1075 | ouid = inode->i_uid; |
1076 | ogid = inode->i_gid; | |
b3b94faa DT |
1077 | nuid = attr->ia_uid; |
1078 | ngid = attr->ia_gid; | |
1079 | ||
1080 | if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) | |
1081 | ouid = nuid = NO_QUOTA_CHANGE; | |
1082 | if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) | |
1083 | ogid = ngid = NO_QUOTA_CHANGE; | |
1084 | ||
182fe5ab CG |
1085 | if (!gfs2_alloc_get(ip)) |
1086 | return -ENOMEM; | |
b3b94faa DT |
1087 | |
1088 | error = gfs2_quota_lock(ip, nuid, ngid); | |
1089 | if (error) | |
1090 | goto out_alloc; | |
1091 | ||
1092 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
1093 | error = gfs2_quota_check(ip, nuid, ngid); | |
1094 | if (error) | |
1095 | goto out_gunlock_q; | |
1096 | } | |
1097 | ||
1098 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1099 | if (error) | |
1100 | goto out_gunlock_q; | |
1101 | ||
2ae51ed7 | 1102 | error = gfs2_setattr_simple(ip, attr); |
b3b94faa DT |
1103 | if (error) |
1104 | goto out_end_trans; | |
1105 | ||
b3b94faa | 1106 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { |
77658aad SW |
1107 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1108 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1109 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1110 | } |
1111 | ||
a91ea69f | 1112 | out_end_trans: |
b3b94faa | 1113 | gfs2_trans_end(sdp); |
a91ea69f | 1114 | out_gunlock_q: |
b3b94faa | 1115 | gfs2_quota_unlock(ip); |
a91ea69f | 1116 | out_alloc: |
b3b94faa | 1117 | gfs2_alloc_put(ip); |
b3b94faa DT |
1118 | return error; |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * gfs2_setattr - Change attributes on an inode | |
1123 | * @dentry: The dentry which is changing | |
1124 | * @attr: The structure describing the change | |
1125 | * | |
1126 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1127 | * that change out to disk. | |
1128 | * | |
1129 | * Returns: errno | |
1130 | */ | |
1131 | ||
1132 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1133 | { | |
1134 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1135 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1136 | struct gfs2_holder i_gh; |
1137 | int error; | |
1138 | ||
b3b94faa DT |
1139 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1140 | if (error) | |
1141 | return error; | |
1142 | ||
1143 | error = -EPERM; | |
1144 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1145 | goto out; | |
1146 | ||
1147 | error = inode_change_ok(inode, attr); | |
1148 | if (error) | |
1149 | goto out; | |
1150 | ||
1151 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1152 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1153 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1154 | error = setattr_chown(inode, attr); | |
1155 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1156 | error = gfs2_acl_chmod(ip, attr); | |
1157 | else | |
1158 | error = gfs2_setattr_simple(ip, attr); | |
1159 | ||
a91ea69f | 1160 | out: |
b3b94faa | 1161 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1162 | if (!error) |
1163 | mark_inode_dirty(inode); | |
b3b94faa DT |
1164 | return error; |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1169 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1170 | * @dentry: The dentry to stat |
1171 | * @stat: The inode's stats | |
1172 | * | |
dcf3dd85 SW |
1173 | * This may be called from the VFS directly, or from within GFS2 with the |
1174 | * inode locked, so we look to see if the glock is already locked and only | |
1175 | * lock the glock if its not already been done. Note that its the NFS | |
1176 | * readdirplus operation which causes this to be called (from filldir) | |
1177 | * with the glock already held. | |
1178 | * | |
b3b94faa DT |
1179 | * Returns: errno |
1180 | */ | |
1181 | ||
1182 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1183 | struct kstat *stat) | |
1184 | { | |
1185 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1186 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1187 | struct gfs2_holder gh; |
1188 | int error; | |
dcf3dd85 | 1189 | int unlock = 0; |
b3b94faa | 1190 | |
7afd88d9 | 1191 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1192 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1193 | if (error) | |
1194 | return error; | |
1195 | unlock = 1; | |
b3b94faa DT |
1196 | } |
1197 | ||
dcf3dd85 | 1198 | generic_fillattr(inode, stat); |
d7c103d0 | 1199 | if (unlock) |
dcf3dd85 SW |
1200 | gfs2_glock_dq_uninit(&gh); |
1201 | ||
1202 | return 0; | |
b3b94faa DT |
1203 | } |
1204 | ||
1205 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1206 | const void *data, size_t size, int flags) | |
1207 | { | |
feaa7bba | 1208 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1209 | struct gfs2_inode *ip = GFS2_I(inode); |
1210 | struct gfs2_holder gh; | |
1211 | int ret; | |
b3b94faa | 1212 | |
40b78a32 SW |
1213 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1214 | ret = gfs2_glock_nq(&gh); | |
1215 | if (ret == 0) { | |
1216 | ret = generic_setxattr(dentry, name, data, size, flags); | |
1217 | gfs2_glock_dq(&gh); | |
1218 | } | |
1219 | gfs2_holder_uninit(&gh); | |
1220 | return ret; | |
b3b94faa DT |
1221 | } |
1222 | ||
1223 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1224 | void *data, size_t size) | |
1225 | { | |
40b78a32 SW |
1226 | struct inode *inode = dentry->d_inode; |
1227 | struct gfs2_inode *ip = GFS2_I(inode); | |
1228 | struct gfs2_holder gh; | |
1229 | int ret; | |
b3b94faa | 1230 | |
40b78a32 SW |
1231 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1232 | ret = gfs2_glock_nq(&gh); | |
1233 | if (ret == 0) { | |
1234 | ret = generic_getxattr(dentry, name, data, size); | |
1235 | gfs2_glock_dq(&gh); | |
1236 | } | |
1237 | gfs2_holder_uninit(&gh); | |
1238 | return ret; | |
b3b94faa DT |
1239 | } |
1240 | ||
1241 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1242 | { | |
40b78a32 SW |
1243 | struct inode *inode = dentry->d_inode; |
1244 | struct gfs2_inode *ip = GFS2_I(inode); | |
1245 | struct gfs2_holder gh; | |
1246 | int ret; | |
b3b94faa | 1247 | |
40b78a32 SW |
1248 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1249 | ret = gfs2_glock_nq(&gh); | |
1250 | if (ret == 0) { | |
1251 | ret = generic_removexattr(dentry, name); | |
1252 | gfs2_glock_dq(&gh); | |
1253 | } | |
1254 | gfs2_holder_uninit(&gh); | |
1255 | return ret; | |
b3b94faa DT |
1256 | } |
1257 | ||
e9079cce SW |
1258 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1259 | u64 start, u64 len) | |
1260 | { | |
1261 | struct gfs2_inode *ip = GFS2_I(inode); | |
1262 | struct gfs2_holder gh; | |
1263 | int ret; | |
1264 | ||
1265 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1266 | if (ret) | |
1267 | return ret; | |
1268 | ||
1269 | mutex_lock(&inode->i_mutex); | |
1270 | ||
1271 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1272 | if (ret) | |
1273 | goto out; | |
1274 | ||
1275 | if (gfs2_is_stuffed(ip)) { | |
1276 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1277 | u64 size = i_size_read(inode); | |
1278 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1279 | FIEMAP_EXTENT_DATA_INLINE; | |
1280 | phys += sizeof(struct gfs2_dinode); | |
1281 | phys += start; | |
1282 | if (start + len > size) | |
1283 | len = size - start; | |
1284 | if (start < size) | |
1285 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1286 | len, flags); | |
1287 | if (ret == 1) | |
1288 | ret = 0; | |
1289 | } else { | |
1290 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1291 | gfs2_block_map); | |
1292 | } | |
1293 | ||
1294 | gfs2_glock_dq_uninit(&gh); | |
1295 | out: | |
1296 | mutex_unlock(&inode->i_mutex); | |
1297 | return ret; | |
1298 | } | |
1299 | ||
92e1d5be | 1300 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1301 | .permission = gfs2_permission, |
b3b94faa DT |
1302 | .setattr = gfs2_setattr, |
1303 | .getattr = gfs2_getattr, | |
1304 | .setxattr = gfs2_setxattr, | |
1305 | .getxattr = gfs2_getxattr, | |
1306 | .listxattr = gfs2_listxattr, | |
1307 | .removexattr = gfs2_removexattr, | |
e9079cce | 1308 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1309 | }; |
1310 | ||
92e1d5be | 1311 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1312 | .create = gfs2_create, |
1313 | .lookup = gfs2_lookup, | |
1314 | .link = gfs2_link, | |
1315 | .unlink = gfs2_unlink, | |
1316 | .symlink = gfs2_symlink, | |
1317 | .mkdir = gfs2_mkdir, | |
1318 | .rmdir = gfs2_rmdir, | |
1319 | .mknod = gfs2_mknod, | |
1320 | .rename = gfs2_rename, | |
e6305c43 | 1321 | .permission = gfs2_permission, |
b3b94faa DT |
1322 | .setattr = gfs2_setattr, |
1323 | .getattr = gfs2_getattr, | |
1324 | .setxattr = gfs2_setxattr, | |
1325 | .getxattr = gfs2_getxattr, | |
1326 | .listxattr = gfs2_listxattr, | |
1327 | .removexattr = gfs2_removexattr, | |
e9079cce | 1328 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1329 | }; |
1330 | ||
92e1d5be | 1331 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1332 | .readlink = generic_readlink, |
b3b94faa | 1333 | .follow_link = gfs2_follow_link, |
c177c2ac | 1334 | .put_link = gfs2_put_link, |
e6305c43 | 1335 | .permission = gfs2_permission, |
b3b94faa DT |
1336 | .setattr = gfs2_setattr, |
1337 | .getattr = gfs2_getattr, | |
1338 | .setxattr = gfs2_setxattr, | |
1339 | .getxattr = gfs2_getxattr, | |
1340 | .listxattr = gfs2_listxattr, | |
1341 | .removexattr = gfs2_removexattr, | |
e9079cce | 1342 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1343 | }; |
1344 |