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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 | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/posix_acl.h> | |
16 | #include <linux/sort.h> | |
5c676f6d | 17 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 18 | #include <linux/crc32.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d SW |
21 | #include "lm_interface.h" |
22 | #include "incore.h" | |
b3b94faa DT |
23 | #include "acl.h" |
24 | #include "bmap.h" | |
25 | #include "dir.h" | |
26 | #include "eattr.h" | |
27 | #include "glock.h" | |
28 | #include "glops.h" | |
29 | #include "inode.h" | |
30 | #include "log.h" | |
31 | #include "meta_io.h" | |
32 | #include "ops_address.h" | |
33 | #include "ops_file.h" | |
34 | #include "ops_inode.h" | |
35 | #include "quota.h" | |
36 | #include "rgrp.h" | |
37 | #include "trans.h" | |
38 | #include "unlinked.h" | |
5c676f6d | 39 | #include "util.h" |
b3b94faa DT |
40 | |
41 | /** | |
42 | * inode_attr_in - Copy attributes from the dinode into the VFS inode | |
43 | * @ip: The GFS2 inode (with embedded disk inode data) | |
44 | * @inode: The Linux VFS inode | |
45 | * | |
46 | */ | |
47 | ||
48 | static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode) | |
49 | { | |
50 | inode->i_ino = ip->i_num.no_formal_ino; | |
51 | ||
52 | switch (ip->i_di.di_mode & S_IFMT) { | |
53 | case S_IFBLK: | |
54 | case S_IFCHR: | |
55 | inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); | |
56 | break; | |
57 | default: | |
58 | inode->i_rdev = 0; | |
59 | break; | |
60 | }; | |
61 | ||
62 | inode->i_mode = ip->i_di.di_mode; | |
63 | inode->i_nlink = ip->i_di.di_nlink; | |
64 | inode->i_uid = ip->i_di.di_uid; | |
65 | inode->i_gid = ip->i_di.di_gid; | |
66 | i_size_write(inode, ip->i_di.di_size); | |
67 | inode->i_atime.tv_sec = ip->i_di.di_atime; | |
68 | inode->i_mtime.tv_sec = ip->i_di.di_mtime; | |
69 | inode->i_ctime.tv_sec = ip->i_di.di_ctime; | |
70 | inode->i_atime.tv_nsec = 0; | |
71 | inode->i_mtime.tv_nsec = 0; | |
72 | inode->i_ctime.tv_nsec = 0; | |
73 | inode->i_blksize = PAGE_SIZE; | |
74 | inode->i_blocks = ip->i_di.di_blocks << | |
75 | (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); | |
76 | ||
77 | if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) | |
78 | inode->i_flags |= S_IMMUTABLE; | |
79 | else | |
80 | inode->i_flags &= ~S_IMMUTABLE; | |
81 | ||
82 | if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) | |
83 | inode->i_flags |= S_APPEND; | |
84 | else | |
85 | inode->i_flags &= ~S_APPEND; | |
86 | } | |
87 | ||
88 | /** | |
89 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode | |
90 | * @ip: The GFS2 inode (with embedded disk inode data) | |
91 | * | |
92 | */ | |
93 | ||
94 | void gfs2_inode_attr_in(struct gfs2_inode *ip) | |
95 | { | |
96 | struct inode *inode; | |
97 | ||
98 | inode = gfs2_ip2v_lookup(ip); | |
99 | if (inode) { | |
100 | inode_attr_in(ip, inode); | |
101 | iput(inode); | |
102 | } | |
103 | } | |
104 | ||
105 | /** | |
106 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
107 | * @ip: The GFS2 inode | |
108 | * | |
109 | * Only copy out the attributes that we want the VFS layer | |
110 | * to be able to modify. | |
111 | */ | |
112 | ||
113 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
114 | { | |
115 | struct inode *inode = ip->i_vnode; | |
116 | ||
117 | gfs2_assert_withdraw(ip->i_sbd, | |
118 | (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); | |
119 | ip->i_di.di_mode = inode->i_mode; | |
120 | ip->i_di.di_uid = inode->i_uid; | |
121 | ip->i_di.di_gid = inode->i_gid; | |
122 | ip->i_di.di_atime = inode->i_atime.tv_sec; | |
123 | ip->i_di.di_mtime = inode->i_mtime.tv_sec; | |
124 | ip->i_di.di_ctime = inode->i_ctime.tv_sec; | |
125 | } | |
126 | ||
127 | /** | |
128 | * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode | |
129 | * @ip: the struct gfs2_inode to get the struct inode for | |
130 | * | |
131 | * Returns: A VFS inode, or NULL if none | |
132 | */ | |
133 | ||
134 | struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip) | |
135 | { | |
136 | struct inode *inode = NULL; | |
137 | ||
138 | gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags)); | |
139 | ||
140 | spin_lock(&ip->i_spin); | |
141 | if (ip->i_vnode) | |
142 | inode = igrab(ip->i_vnode); | |
143 | spin_unlock(&ip->i_spin); | |
144 | ||
145 | return inode; | |
146 | } | |
147 | ||
148 | /** | |
149 | * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode | |
150 | * @ip: the struct gfs2_inode to get the struct inode for | |
151 | * | |
152 | * Returns: A VFS inode, or NULL if no mem | |
153 | */ | |
154 | ||
155 | struct inode *gfs2_ip2v(struct gfs2_inode *ip) | |
156 | { | |
157 | struct inode *inode, *tmp; | |
158 | ||
159 | inode = gfs2_ip2v_lookup(ip); | |
160 | if (inode) | |
161 | return inode; | |
162 | ||
163 | tmp = new_inode(ip->i_sbd->sd_vfs); | |
164 | if (!tmp) | |
165 | return NULL; | |
166 | ||
167 | inode_attr_in(ip, tmp); | |
168 | ||
169 | if (S_ISREG(ip->i_di.di_mode)) { | |
170 | tmp->i_op = &gfs2_file_iops; | |
171 | tmp->i_fop = &gfs2_file_fops; | |
172 | tmp->i_mapping->a_ops = &gfs2_file_aops; | |
173 | } else if (S_ISDIR(ip->i_di.di_mode)) { | |
174 | tmp->i_op = &gfs2_dir_iops; | |
175 | tmp->i_fop = &gfs2_dir_fops; | |
176 | } else if (S_ISLNK(ip->i_di.di_mode)) { | |
177 | tmp->i_op = &gfs2_symlink_iops; | |
178 | } else { | |
179 | tmp->i_op = &gfs2_dev_iops; | |
180 | init_special_inode(tmp, tmp->i_mode, tmp->i_rdev); | |
181 | } | |
182 | ||
5c676f6d | 183 | tmp->u.generic_ip = NULL; |
b3b94faa DT |
184 | |
185 | for (;;) { | |
186 | spin_lock(&ip->i_spin); | |
187 | if (!ip->i_vnode) | |
188 | break; | |
189 | inode = igrab(ip->i_vnode); | |
190 | spin_unlock(&ip->i_spin); | |
191 | ||
192 | if (inode) { | |
193 | iput(tmp); | |
194 | return inode; | |
195 | } | |
196 | yield(); | |
197 | } | |
198 | ||
199 | inode = tmp; | |
200 | ||
201 | gfs2_inode_hold(ip); | |
202 | ip->i_vnode = inode; | |
5c676f6d | 203 | inode->u.generic_ip = ip; |
b3b94faa DT |
204 | |
205 | spin_unlock(&ip->i_spin); | |
206 | ||
207 | insert_inode_hash(inode); | |
208 | ||
209 | return inode; | |
210 | } | |
211 | ||
212 | static int iget_test(struct inode *inode, void *opaque) | |
213 | { | |
5c676f6d | 214 | struct gfs2_inode *ip = inode->u.generic_ip; |
b3b94faa DT |
215 | struct gfs2_inum *inum = (struct gfs2_inum *)opaque; |
216 | ||
217 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
218 | return 1; | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) | |
224 | { | |
225 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
226 | iget_test, inum); | |
227 | } | |
228 | ||
229 | void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type) | |
230 | { | |
b3b94faa DT |
231 | if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) { |
232 | ip->i_di.di_nlink = 1; | |
233 | ip->i_di.di_mode = DT2IF(type); | |
234 | } | |
b3b94faa DT |
235 | } |
236 | ||
237 | /** | |
238 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
239 | * @ip: The GFS2 inode | |
240 | * | |
241 | * Returns: errno | |
242 | */ | |
243 | ||
244 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
245 | { | |
246 | struct buffer_head *dibh; | |
247 | int error; | |
248 | ||
249 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
250 | if (error) | |
251 | return error; | |
252 | ||
253 | if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) { | |
254 | brelse(dibh); | |
255 | return -EIO; | |
256 | } | |
257 | ||
b3b94faa DT |
258 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
259 | set_bit(GIF_MIN_INIT, &ip->i_flags); | |
b3b94faa DT |
260 | |
261 | brelse(dibh); | |
262 | ||
263 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
264 | if (gfs2_consist_inode(ip)) | |
265 | gfs2_dinode_print(&ip->i_di); | |
266 | return -EIO; | |
267 | } | |
268 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
269 | return -ESTALE; | |
270 | ||
271 | ip->i_vn = ip->i_gl->gl_vn; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | /** | |
277 | * inode_create - create a struct gfs2_inode | |
278 | * @i_gl: The glock covering the inode | |
279 | * @inum: The inode number | |
280 | * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode) | |
281 | * @io_state: the state the iopen glock should be acquired in | |
282 | * @ipp: pointer to put the returned inode in | |
283 | * | |
284 | * Returns: errno | |
285 | */ | |
286 | ||
c9fd4307 | 287 | static int inode_create(struct gfs2_glock *i_gl, const struct gfs2_inum *inum, |
b3b94faa | 288 | struct gfs2_glock *io_gl, unsigned int io_state, |
36327521 | 289 | struct gfs2_inode **ipp, int need_lock) |
b3b94faa DT |
290 | { |
291 | struct gfs2_sbd *sdp = i_gl->gl_sbd; | |
292 | struct gfs2_inode *ip; | |
293 | int error = 0; | |
294 | ||
295 | ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); | |
296 | if (!ip) | |
297 | return -ENOMEM; | |
298 | memset(ip, 0, sizeof(struct gfs2_inode)); | |
b3b94faa | 299 | ip->i_num = *inum; |
b3b94faa | 300 | atomic_set(&ip->i_count, 1); |
b3b94faa | 301 | ip->i_vn = i_gl->gl_vn - 1; |
b3b94faa DT |
302 | ip->i_gl = i_gl; |
303 | ip->i_sbd = sdp; | |
b3b94faa DT |
304 | spin_lock_init(&ip->i_spin); |
305 | init_rwsem(&ip->i_rw_mutex); | |
b3b94faa DT |
306 | ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default); |
307 | ||
36327521 SW |
308 | if (need_lock) { |
309 | error = gfs2_glock_nq_init(io_gl, | |
310 | io_state, GL_LOCAL_EXCL | GL_EXACT, | |
311 | &ip->i_iopen_gh); | |
312 | if (error) | |
313 | goto fail; | |
b3b94faa | 314 | |
64c14ea7 SW |
315 | spin_lock(&io_gl->gl_spin); |
316 | gfs2_glock_hold(i_gl); | |
317 | io_gl->gl_object = i_gl; | |
318 | spin_unlock(&io_gl->gl_spin); | |
319 | } | |
b3b94faa DT |
320 | |
321 | gfs2_glock_hold(i_gl); | |
5c676f6d | 322 | i_gl->gl_object = ip; |
b3b94faa | 323 | atomic_inc(&sdp->sd_inode_count); |
b3b94faa | 324 | *ipp = ip; |
b3b94faa DT |
325 | return 0; |
326 | ||
64c14ea7 | 327 | fail: |
b3b94faa DT |
328 | gfs2_meta_cache_flush(ip); |
329 | kmem_cache_free(gfs2_inode_cachep, ip); | |
330 | *ipp = NULL; | |
b3b94faa DT |
331 | return error; |
332 | } | |
333 | ||
334 | /** | |
335 | * gfs2_inode_get - Create or get a reference on an inode | |
336 | * @i_gl: The glock covering the inode | |
337 | * @inum: The inode number | |
338 | * @create: | |
339 | * @ipp: pointer to put the returned inode in | |
340 | * | |
341 | * Returns: errno | |
342 | */ | |
343 | ||
c9fd4307 SW |
344 | int gfs2_inode_get(struct gfs2_glock *i_gl, const struct gfs2_inum *inum, |
345 | int create, struct gfs2_inode **ipp) | |
b3b94faa DT |
346 | { |
347 | struct gfs2_sbd *sdp = i_gl->gl_sbd; | |
348 | struct gfs2_glock *io_gl; | |
349 | int error = 0; | |
350 | ||
351 | gfs2_glmutex_lock(i_gl); | |
352 | ||
5c676f6d | 353 | *ipp = i_gl->gl_object; |
b3b94faa DT |
354 | if (*ipp) { |
355 | error = -ESTALE; | |
356 | if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino) | |
357 | goto out; | |
358 | atomic_inc(&(*ipp)->i_count); | |
359 | error = 0; | |
360 | goto out; | |
361 | } | |
362 | ||
363 | if (!create) | |
364 | goto out; | |
365 | ||
366 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, | |
367 | CREATE, &io_gl); | |
368 | if (!error) { | |
36327521 | 369 | error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp, 1); |
b3b94faa DT |
370 | gfs2_glock_put(io_gl); |
371 | } | |
372 | ||
373 | out: | |
374 | gfs2_glmutex_unlock(i_gl); | |
375 | ||
376 | return error; | |
377 | } | |
378 | ||
379 | void gfs2_inode_hold(struct gfs2_inode *ip) | |
380 | { | |
381 | gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); | |
382 | atomic_inc(&ip->i_count); | |
383 | } | |
384 | ||
385 | void gfs2_inode_put(struct gfs2_inode *ip) | |
386 | { | |
387 | gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); | |
388 | atomic_dec(&ip->i_count); | |
389 | } | |
390 | ||
36327521 | 391 | void gfs2_inode_destroy(struct gfs2_inode *ip, int unlock) |
b3b94faa DT |
392 | { |
393 | struct gfs2_sbd *sdp = ip->i_sbd; | |
b3b94faa DT |
394 | struct gfs2_glock *i_gl = ip->i_gl; |
395 | ||
396 | gfs2_assert_warn(sdp, !atomic_read(&ip->i_count)); | |
36327521 SW |
397 | if (unlock) { |
398 | struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl; | |
399 | gfs2_assert(sdp, io_gl->gl_object == i_gl); | |
400 | ||
401 | spin_lock(&io_gl->gl_spin); | |
402 | io_gl->gl_object = NULL; | |
403 | spin_unlock(&io_gl->gl_spin); | |
404 | gfs2_glock_put(i_gl); | |
405 | ||
406 | gfs2_glock_dq_uninit(&ip->i_iopen_gh); | |
407 | } | |
b3b94faa DT |
408 | |
409 | gfs2_meta_cache_flush(ip); | |
410 | kmem_cache_free(gfs2_inode_cachep, ip); | |
411 | ||
5c676f6d | 412 | i_gl->gl_object = NULL; |
b3b94faa DT |
413 | gfs2_glock_put(i_gl); |
414 | ||
415 | atomic_dec(&sdp->sd_inode_count); | |
416 | } | |
417 | ||
418 | static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul) | |
419 | { | |
420 | struct gfs2_sbd *sdp = ip->i_sbd; | |
421 | struct gfs2_alloc *al; | |
422 | struct gfs2_rgrpd *rgd; | |
423 | int error; | |
424 | ||
425 | if (ip->i_di.di_blocks != 1) { | |
426 | if (gfs2_consist_inode(ip)) | |
427 | gfs2_dinode_print(&ip->i_di); | |
428 | return -EIO; | |
429 | } | |
430 | ||
431 | al = gfs2_alloc_get(ip); | |
432 | ||
433 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
434 | if (error) | |
435 | goto out; | |
436 | ||
437 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
438 | if (error) | |
439 | goto out_qs; | |
440 | ||
441 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
442 | if (!rgd) { | |
443 | gfs2_consist_inode(ip); | |
444 | error = -EIO; | |
445 | goto out_rindex_relse; | |
446 | } | |
447 | ||
448 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
449 | &al->al_rgd_gh); | |
450 | if (error) | |
451 | goto out_rindex_relse; | |
452 | ||
453 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + | |
454 | RES_STATFS + RES_QUOTA, 1); | |
455 | if (error) | |
456 | goto out_rg_gunlock; | |
457 | ||
458 | gfs2_trans_add_gl(ip->i_gl); | |
459 | ||
460 | gfs2_free_di(rgd, ip); | |
461 | ||
462 | error = gfs2_unlinked_ondisk_rm(sdp, ul); | |
463 | ||
464 | gfs2_trans_end(sdp); | |
465 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
466 | ||
467 | out_rg_gunlock: | |
468 | gfs2_glock_dq_uninit(&al->al_rgd_gh); | |
469 | ||
470 | out_rindex_relse: | |
471 | gfs2_glock_dq_uninit(&al->al_ri_gh); | |
472 | ||
473 | out_qs: | |
474 | gfs2_quota_unhold(ip); | |
475 | ||
476 | out: | |
477 | gfs2_alloc_put(ip); | |
478 | ||
479 | return error; | |
480 | } | |
481 | ||
482 | /** | |
483 | * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode) | |
484 | * @sdp: the filesystem | |
485 | * @inum: the inode number to deallocate | |
486 | * @io_gh: a holder for the iopen glock for this inode | |
487 | * | |
36327521 SW |
488 | * N.B. When we enter this we already hold the iopen glock and getting |
489 | * the glock for the inode means that we are grabbing the locks in the | |
490 | * "wrong" order so we must only so a try lock operation and fail if we | |
491 | * don't get the lock. Thats ok, since if we fail it means someone else | |
492 | * is using the inode still and thus we shouldn't be deallocating it | |
493 | * anyway. | |
494 | * | |
b3b94faa DT |
495 | * Returns: errno |
496 | */ | |
497 | ||
498 | static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul, | |
499 | struct gfs2_holder *io_gh) | |
500 | { | |
501 | struct gfs2_inode *ip; | |
502 | struct gfs2_holder i_gh; | |
503 | int error; | |
504 | ||
36327521 SW |
505 | error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, |
506 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, | |
320dd101 | 507 | LM_FLAG_TRY_1CB|GL_DUMP, &i_gh); |
36327521 | 508 | switch(error) { |
b3b94faa DT |
509 | case 0: |
510 | break; | |
511 | case GLR_TRYFAILED: | |
36327521 | 512 | return 1; /* or back off and relock in different order? */ |
b3b94faa | 513 | default: |
36327521 | 514 | return error; |
b3b94faa DT |
515 | } |
516 | ||
5c676f6d | 517 | gfs2_assert_warn(sdp, !i_gh.gh_gl->gl_object); |
b3b94faa | 518 | error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl, |
36327521 | 519 | LM_ST_EXCLUSIVE, &ip, 0); |
b3b94faa DT |
520 | |
521 | if (error) | |
522 | goto out; | |
523 | ||
524 | error = gfs2_inode_refresh(ip); | |
525 | if (error) | |
526 | goto out_iput; | |
527 | ||
528 | if (ip->i_di.di_nlink) { | |
529 | if (gfs2_consist_inode(ip)) | |
530 | gfs2_dinode_print(&ip->i_di); | |
531 | error = -EIO; | |
532 | goto out_iput; | |
533 | } | |
534 | ||
535 | if (S_ISDIR(ip->i_di.di_mode) && | |
536 | (ip->i_di.di_flags & GFS2_DIF_EXHASH)) { | |
537 | error = gfs2_dir_exhash_dealloc(ip); | |
538 | if (error) | |
539 | goto out_iput; | |
540 | } | |
541 | ||
542 | if (ip->i_di.di_eattr) { | |
543 | error = gfs2_ea_dealloc(ip); | |
544 | if (error) | |
545 | goto out_iput; | |
546 | } | |
547 | ||
548 | if (!gfs2_is_stuffed(ip)) { | |
549 | error = gfs2_file_dealloc(ip); | |
550 | if (error) | |
551 | goto out_iput; | |
552 | } | |
553 | ||
554 | error = dinode_dealloc(ip, ul); | |
555 | if (error) | |
556 | goto out_iput; | |
557 | ||
36327521 | 558 | out_iput: |
b3b94faa DT |
559 | gfs2_glmutex_lock(i_gh.gh_gl); |
560 | gfs2_inode_put(ip); | |
36327521 | 561 | gfs2_inode_destroy(ip, 0); |
b3b94faa DT |
562 | gfs2_glmutex_unlock(i_gh.gh_gl); |
563 | ||
36327521 | 564 | out: |
b3b94faa DT |
565 | gfs2_glock_dq_uninit(&i_gh); |
566 | ||
567 | return error; | |
568 | } | |
569 | ||
570 | /** | |
571 | * try_inode_dealloc - Try to deallocate an inode and all its blocks | |
572 | * @sdp: the filesystem | |
573 | * | |
574 | * Returns: 0 on success, -errno on error, 1 on busy (inode open) | |
575 | */ | |
576 | ||
577 | static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) | |
578 | { | |
b3b94faa | 579 | int error = 0; |
36327521 | 580 | struct gfs2_holder iogh; |
b3b94faa DT |
581 | |
582 | gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum); | |
36327521 SW |
583 | error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, |
584 | &gfs2_iopen_glops, LM_ST_EXCLUSIVE, | |
585 | LM_FLAG_TRY_1CB, &iogh); | |
b3b94faa DT |
586 | switch (error) { |
587 | case 0: | |
588 | break; | |
589 | case GLR_TRYFAILED: | |
590 | return 1; | |
591 | default: | |
592 | return error; | |
593 | } | |
594 | ||
36327521 SW |
595 | error = inode_dealloc(sdp, ul, &iogh); |
596 | gfs2_glock_dq_uninit(&iogh); | |
b3b94faa DT |
597 | |
598 | return error; | |
599 | } | |
600 | ||
601 | static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) | |
602 | { | |
603 | struct gfs2_rgrpd *rgd; | |
604 | struct gfs2_holder ri_gh, rgd_gh; | |
605 | int error; | |
606 | ||
607 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
608 | if (error) | |
609 | return error; | |
610 | ||
611 | rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr); | |
612 | if (!rgd) { | |
613 | gfs2_consist(sdp); | |
614 | error = -EIO; | |
615 | goto out; | |
616 | } | |
617 | ||
618 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh); | |
619 | if (error) | |
620 | goto out; | |
621 | ||
36327521 | 622 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + RES_STATFS, 0); |
b3b94faa DT |
623 | if (error) |
624 | goto out_gunlock; | |
625 | ||
626 | gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr); | |
627 | gfs2_unlinked_ondisk_rm(sdp, ul); | |
628 | ||
629 | gfs2_trans_end(sdp); | |
630 | ||
631 | out_gunlock: | |
632 | gfs2_glock_dq_uninit(&rgd_gh); | |
633 | out: | |
634 | gfs2_glock_dq_uninit(&ri_gh); | |
635 | ||
636 | return error; | |
637 | } | |
638 | ||
639 | int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) | |
640 | { | |
641 | if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT) | |
642 | return inode_dealloc_uninit(sdp, ul); | |
643 | else | |
644 | return try_inode_dealloc(sdp, ul); | |
645 | } | |
646 | ||
647 | /** | |
648 | * gfs2_change_nlink - Change nlink count on inode | |
649 | * @ip: The GFS2 inode | |
650 | * @diff: The change in the nlink count required | |
651 | * | |
652 | * Returns: errno | |
653 | */ | |
654 | ||
655 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
656 | { | |
657 | struct buffer_head *dibh; | |
658 | uint32_t nlink; | |
659 | int error; | |
660 | ||
661 | nlink = ip->i_di.di_nlink + diff; | |
662 | ||
663 | /* If we are reducing the nlink count, but the new value ends up being | |
664 | bigger than the old one, we must have underflowed. */ | |
665 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
666 | if (gfs2_consist_inode(ip)) | |
667 | gfs2_dinode_print(&ip->i_di); | |
668 | return -EIO; | |
669 | } | |
670 | ||
671 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
672 | if (error) | |
673 | return error; | |
674 | ||
675 | ip->i_di.di_nlink = nlink; | |
676 | ip->i_di.di_ctime = get_seconds(); | |
677 | ||
d4e9c4c3 | 678 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
679 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
680 | brelse(dibh); | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
c752666c SW |
685 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
686 | { | |
687 | struct qstr qstr; | |
71b86f56 | 688 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
689 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
690 | } | |
691 | ||
692 | ||
b3b94faa DT |
693 | /** |
694 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
695 | * @d_gh: An initialized holder for the directory glock | |
696 | * @name: The name of the inode to look for | |
697 | * @is_root: If 1, ignore the caller's permissions | |
698 | * @i_gh: An uninitialized holder for the new inode glock | |
699 | * | |
700 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
701 | * @is_root is true. | |
702 | * | |
703 | * Returns: errno | |
704 | */ | |
705 | ||
c752666c SW |
706 | struct inode *gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root, |
707 | struct nameidata *nd) | |
708 | ||
b3b94faa | 709 | { |
c9fd4307 | 710 | struct super_block *sb = dir->i_sb; |
7359a19c | 711 | struct gfs2_inode *ipp; |
5c676f6d | 712 | struct gfs2_inode *dip = dir->u.generic_ip; |
b3b94faa DT |
713 | struct gfs2_sbd *sdp = dip->i_sbd; |
714 | struct gfs2_holder d_gh; | |
715 | struct gfs2_inum inum; | |
716 | unsigned int type; | |
717 | struct gfs2_glock *gl; | |
7359a19c | 718 | int error = 0; |
c752666c | 719 | struct inode *inode = NULL; |
b3b94faa DT |
720 | |
721 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 722 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 723 | |
c752666c SW |
724 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
725 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
726 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
727 | igrab(dir); |
728 | return dir; | |
b3b94faa DT |
729 | } |
730 | ||
731 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
732 | if (error) | |
c752666c | 733 | return ERR_PTR(error); |
b3b94faa DT |
734 | |
735 | if (!is_root) { | |
320dd101 | 736 | error = gfs2_repermission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
737 | if (error) |
738 | goto out; | |
739 | } | |
740 | ||
c752666c | 741 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
742 | if (error) |
743 | goto out; | |
744 | ||
745 | error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops, | |
746 | CREATE, &gl); | |
747 | if (error) | |
748 | goto out; | |
749 | ||
7359a19c | 750 | error = gfs2_inode_get(gl, &inum, CREATE, &ipp); |
b3b94faa | 751 | if (!error) |
7359a19c | 752 | gfs2_inode_min_init(ipp, type); |
b3b94faa DT |
753 | |
754 | gfs2_glock_put(gl); | |
755 | ||
7359a19c | 756 | out: |
b3b94faa | 757 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
758 | if (error == -ENOENT) |
759 | return NULL; | |
7359a19c | 760 | if (error == 0) { |
c752666c | 761 | inode = gfs2_ip2v(ipp); |
7359a19c | 762 | gfs2_inode_put(ipp); |
c752666c SW |
763 | if (!inode) |
764 | return ERR_PTR(-ENOMEM); | |
765 | return inode; | |
7359a19c | 766 | } |
c752666c | 767 | return ERR_PTR(error); |
b3b94faa DT |
768 | } |
769 | ||
770 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
771 | { | |
5c676f6d | 772 | struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip; |
b3b94faa DT |
773 | struct buffer_head *bh; |
774 | struct gfs2_inum_range ir; | |
775 | int error; | |
776 | ||
777 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
778 | if (error) | |
779 | return error; | |
f55ab26a | 780 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
781 | |
782 | error = gfs2_meta_inode_buffer(ip, &bh); | |
783 | if (error) { | |
f55ab26a | 784 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
785 | gfs2_trans_end(sdp); |
786 | return error; | |
787 | } | |
788 | ||
789 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
790 | ||
791 | if (ir.ir_length) { | |
792 | *formal_ino = ir.ir_start++; | |
793 | ir.ir_length--; | |
d4e9c4c3 | 794 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
795 | gfs2_inum_range_out(&ir, |
796 | bh->b_data + sizeof(struct gfs2_dinode)); | |
797 | brelse(bh); | |
f55ab26a | 798 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
799 | gfs2_trans_end(sdp); |
800 | return 0; | |
801 | } | |
802 | ||
803 | brelse(bh); | |
804 | ||
f55ab26a | 805 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
806 | gfs2_trans_end(sdp); |
807 | ||
808 | return 1; | |
809 | } | |
810 | ||
811 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
812 | { | |
5c676f6d SW |
813 | struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip; |
814 | struct gfs2_inode *m_ip = sdp->sd_inum_inode->u.generic_ip; | |
b3b94faa DT |
815 | struct gfs2_holder gh; |
816 | struct buffer_head *bh; | |
817 | struct gfs2_inum_range ir; | |
818 | int error; | |
819 | ||
820 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
821 | if (error) | |
822 | return error; | |
823 | ||
824 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
825 | if (error) | |
826 | goto out; | |
f55ab26a | 827 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
828 | |
829 | error = gfs2_meta_inode_buffer(ip, &bh); | |
830 | if (error) | |
831 | goto out_end_trans; | |
832 | ||
833 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
834 | ||
835 | if (!ir.ir_length) { | |
836 | struct buffer_head *m_bh; | |
837 | uint64_t x, y; | |
838 | ||
839 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
840 | if (error) | |
841 | goto out_brelse; | |
842 | ||
843 | x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); | |
844 | x = y = be64_to_cpu(x); | |
845 | ir.ir_start = x; | |
846 | ir.ir_length = GFS2_INUM_QUANTUM; | |
847 | x += GFS2_INUM_QUANTUM; | |
848 | if (x < y) | |
849 | gfs2_consist_inode(m_ip); | |
850 | x = cpu_to_be64(x); | |
d4e9c4c3 | 851 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
852 | *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
853 | ||
854 | brelse(m_bh); | |
855 | } | |
856 | ||
857 | *formal_ino = ir.ir_start++; | |
858 | ir.ir_length--; | |
859 | ||
d4e9c4c3 | 860 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
861 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
862 | ||
863 | out_brelse: | |
864 | brelse(bh); | |
865 | ||
866 | out_end_trans: | |
f55ab26a | 867 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
868 | gfs2_trans_end(sdp); |
869 | ||
870 | out: | |
871 | gfs2_glock_dq_uninit(&gh); | |
872 | ||
873 | return error; | |
874 | } | |
875 | ||
876 | static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) | |
877 | { | |
878 | int error; | |
879 | ||
880 | error = pick_formal_ino_1(sdp, inum); | |
881 | if (error <= 0) | |
882 | return error; | |
883 | ||
884 | error = pick_formal_ino_2(sdp, inum); | |
885 | ||
886 | return error; | |
887 | } | |
888 | ||
889 | /** | |
890 | * create_ok - OK to create a new on-disk inode here? | |
891 | * @dip: Directory in which dinode is to be created | |
892 | * @name: Name of new dinode | |
893 | * @mode: | |
894 | * | |
895 | * Returns: errno | |
896 | */ | |
897 | ||
898 | static int create_ok(struct gfs2_inode *dip, struct qstr *name, | |
899 | unsigned int mode) | |
900 | { | |
901 | int error; | |
902 | ||
903 | error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL); | |
904 | if (error) | |
905 | return error; | |
906 | ||
907 | /* Don't create entries in an unlinked directory */ | |
908 | if (!dip->i_di.di_nlink) | |
909 | return -EPERM; | |
910 | ||
c752666c | 911 | error = gfs2_dir_search(dip->i_vnode, name, NULL, NULL); |
b3b94faa DT |
912 | switch (error) { |
913 | case -ENOENT: | |
914 | error = 0; | |
915 | break; | |
916 | case 0: | |
917 | return -EEXIST; | |
918 | default: | |
919 | return error; | |
920 | } | |
921 | ||
922 | if (dip->i_di.di_entries == (uint32_t)-1) | |
923 | return -EFBIG; | |
924 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) | |
925 | return -EMLINK; | |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
930 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
931 | unsigned int *uid, unsigned int *gid) | |
932 | { | |
933 | if (dip->i_sbd->sd_args.ar_suiddir && | |
934 | (dip->i_di.di_mode & S_ISUID) && | |
935 | dip->i_di.di_uid) { | |
936 | if (S_ISDIR(*mode)) | |
937 | *mode |= S_ISUID; | |
938 | else if (dip->i_di.di_uid != current->fsuid) | |
939 | *mode &= ~07111; | |
940 | *uid = dip->i_di.di_uid; | |
941 | } else | |
942 | *uid = current->fsuid; | |
943 | ||
944 | if (dip->i_di.di_mode & S_ISGID) { | |
945 | if (S_ISDIR(*mode)) | |
946 | *mode |= S_ISGID; | |
947 | *gid = dip->i_di.di_gid; | |
948 | } else | |
949 | *gid = current->fsgid; | |
950 | } | |
951 | ||
952 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul) | |
953 | { | |
954 | struct gfs2_sbd *sdp = dip->i_sbd; | |
955 | int error; | |
956 | ||
957 | gfs2_alloc_get(dip); | |
958 | ||
959 | dip->i_alloc.al_requested = RES_DINODE; | |
960 | error = gfs2_inplace_reserve(dip); | |
961 | if (error) | |
962 | goto out; | |
963 | ||
964 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + | |
965 | RES_STATFS, 0); | |
966 | if (error) | |
967 | goto out_ipreserv; | |
968 | ||
969 | ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip); | |
970 | ||
971 | ul->ul_ut.ut_flags = GFS2_UTF_UNINIT; | |
972 | error = gfs2_unlinked_ondisk_add(sdp, ul); | |
973 | ||
974 | gfs2_trans_end(sdp); | |
975 | ||
976 | out_ipreserv: | |
977 | gfs2_inplace_release(dip); | |
978 | ||
979 | out: | |
980 | gfs2_alloc_put(dip); | |
981 | ||
982 | return error; | |
983 | } | |
984 | ||
985 | /** | |
986 | * init_dinode - Fill in a new dinode structure | |
987 | * @dip: the directory this inode is being created in | |
988 | * @gl: The glock covering the new inode | |
989 | * @inum: the inode number | |
990 | * @mode: the file permissions | |
991 | * @uid: | |
992 | * @gid: | |
993 | * | |
994 | */ | |
995 | ||
996 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
997 | struct gfs2_inum *inum, unsigned int mode, | |
998 | unsigned int uid, unsigned int gid) | |
999 | { | |
1000 | struct gfs2_sbd *sdp = dip->i_sbd; | |
b96ca4fa | 1001 | struct gfs2_dinode *di; |
b3b94faa DT |
1002 | struct buffer_head *dibh; |
1003 | ||
1004 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 1005 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
1006 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
1007 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
1008 | di = (struct gfs2_dinode *)dibh->b_data; |
1009 | ||
2442a098 SW |
1010 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
1011 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
1012 | di->di_mode = cpu_to_be32(mode); |
1013 | di->di_uid = cpu_to_be32(uid); | |
1014 | di->di_gid = cpu_to_be32(gid); | |
1015 | di->di_nlink = cpu_to_be32(0); | |
1016 | di->di_size = cpu_to_be64(0); | |
1017 | di->di_blocks = cpu_to_be64(1); | |
1018 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
1019 | di->di_major = di->di_minor = cpu_to_be32(0); | |
1020 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
1021 | di->__pad[0] = di->__pad[1] = 0; | |
1022 | di->di_flags = cpu_to_be32(0); | |
b3b94faa DT |
1023 | |
1024 | if (S_ISREG(mode)) { | |
1025 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
1026 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 1027 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
1028 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
1029 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 1030 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 1031 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
1032 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
1033 | GFS2_DIF_INHERIT_DIRECTIO); | |
1034 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
1035 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
1036 | } |
1037 | ||
b96ca4fa SW |
1038 | di->__pad1 = 0; |
1039 | di->di_height = cpu_to_be32(0); | |
1040 | di->__pad2 = 0; | |
1041 | di->__pad3 = 0; | |
1042 | di->di_depth = cpu_to_be16(0); | |
1043 | di->di_entries = cpu_to_be32(0); | |
1044 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
1045 | di->di_eattr = cpu_to_be64(0); | |
1046 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
1047 | ||
b3b94faa DT |
1048 | brelse(dibh); |
1049 | } | |
1050 | ||
1051 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
1052 | unsigned int mode, struct gfs2_unlinked *ul) | |
1053 | { | |
1054 | struct gfs2_sbd *sdp = dip->i_sbd; | |
1055 | unsigned int uid, gid; | |
1056 | int error; | |
1057 | ||
1058 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
1059 | gfs2_alloc_get(dip); |
1060 | ||
1061 | error = gfs2_quota_lock(dip, uid, gid); | |
1062 | if (error) | |
1063 | goto out; | |
1064 | ||
1065 | error = gfs2_quota_check(dip, uid, gid); | |
1066 | if (error) | |
1067 | goto out_quota; | |
1068 | ||
320dd101 | 1069 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED + RES_QUOTA, 0); |
b3b94faa DT |
1070 | if (error) |
1071 | goto out_quota; | |
1072 | ||
1073 | ul->ul_ut.ut_flags = 0; | |
1074 | error = gfs2_unlinked_ondisk_munge(sdp, ul); | |
320dd101 | 1075 | init_dinode(dip, gl, &ul->ul_ut.ut_inum, mode, uid, gid); |
b3b94faa | 1076 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
1077 | gfs2_trans_end(sdp); |
1078 | ||
1079 | out_quota: | |
1080 | gfs2_quota_unlock(dip); | |
1081 | ||
1082 | out: | |
1083 | gfs2_alloc_put(dip); | |
b3b94faa DT |
1084 | return error; |
1085 | } | |
1086 | ||
1087 | static int link_dinode(struct gfs2_inode *dip, struct qstr *name, | |
1088 | struct gfs2_inode *ip, struct gfs2_unlinked *ul) | |
1089 | { | |
1090 | struct gfs2_sbd *sdp = dip->i_sbd; | |
1091 | struct gfs2_alloc *al; | |
1092 | int alloc_required; | |
1093 | struct buffer_head *dibh; | |
1094 | int error; | |
1095 | ||
1096 | al = gfs2_alloc_get(dip); | |
1097 | ||
1098 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
1099 | if (error) | |
1100 | goto fail; | |
1101 | ||
c752666c SW |
1102 | error = alloc_required = gfs2_diradd_alloc_required(dip->i_vnode, name); |
1103 | if (alloc_required < 0) | |
1104 | goto fail; | |
b3b94faa DT |
1105 | if (alloc_required) { |
1106 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
1107 | dip->i_di.di_gid); | |
1108 | if (error) | |
1109 | goto fail_quota_locks; | |
1110 | ||
1111 | al->al_requested = sdp->sd_max_dirres; | |
1112 | ||
1113 | error = gfs2_inplace_reserve(dip); | |
1114 | if (error) | |
1115 | goto fail_quota_locks; | |
1116 | ||
320dd101 | 1117 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa DT |
1118 | al->al_rgd->rd_ri.ri_length + |
1119 | 2 * RES_DINODE + RES_UNLINKED + | |
1120 | RES_STATFS + RES_QUOTA, 0); | |
1121 | if (error) | |
1122 | goto fail_ipreserv; | |
1123 | } else { | |
1124 | error = gfs2_trans_begin(sdp, | |
1125 | RES_LEAF + | |
1126 | 2 * RES_DINODE + | |
1127 | RES_UNLINKED, 0); | |
1128 | if (error) | |
1129 | goto fail_quota_locks; | |
1130 | } | |
1131 | ||
c752666c | 1132 | error = gfs2_dir_add(dip->i_vnode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
1133 | if (error) |
1134 | goto fail_end_trans; | |
1135 | ||
1136 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1137 | if (error) | |
1138 | goto fail_end_trans; | |
1139 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 1140 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1141 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1142 | brelse(dibh); | |
1143 | ||
1144 | error = gfs2_unlinked_ondisk_rm(sdp, ul); | |
1145 | if (error) | |
1146 | goto fail_end_trans; | |
1147 | ||
1148 | return 0; | |
1149 | ||
320dd101 | 1150 | fail_end_trans: |
b3b94faa DT |
1151 | gfs2_trans_end(sdp); |
1152 | ||
320dd101 | 1153 | fail_ipreserv: |
b3b94faa DT |
1154 | if (dip->i_alloc.al_rgd) |
1155 | gfs2_inplace_release(dip); | |
1156 | ||
320dd101 | 1157 | fail_quota_locks: |
b3b94faa DT |
1158 | gfs2_quota_unlock(dip); |
1159 | ||
320dd101 | 1160 | fail: |
b3b94faa | 1161 | gfs2_alloc_put(dip); |
b3b94faa DT |
1162 | return error; |
1163 | } | |
1164 | ||
1165 | /** | |
1166 | * gfs2_createi - Create a new inode | |
1167 | * @ghs: An array of two holders | |
1168 | * @name: The name of the new file | |
1169 | * @mode: the permissions on the new inode | |
1170 | * | |
1171 | * @ghs[0] is an initialized holder for the directory | |
1172 | * @ghs[1] is the holder for the inode lock | |
1173 | * | |
7359a19c | 1174 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
1175 | * file are held. A transaction has been started and an inplace reservation |
1176 | * is held, as well. | |
1177 | * | |
7359a19c | 1178 | * Returns: An inode |
b3b94faa DT |
1179 | */ |
1180 | ||
568f4c96 SW |
1181 | struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, |
1182 | unsigned int mode) | |
b3b94faa | 1183 | { |
7359a19c | 1184 | struct inode *inode; |
5c676f6d | 1185 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
b3b94faa DT |
1186 | struct gfs2_sbd *sdp = dip->i_sbd; |
1187 | struct gfs2_unlinked *ul; | |
1188 | struct gfs2_inode *ip; | |
1189 | int error; | |
1190 | ||
1191 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 1192 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa DT |
1193 | |
1194 | error = gfs2_unlinked_get(sdp, &ul); | |
1195 | if (error) | |
7359a19c | 1196 | return ERR_PTR(error); |
b3b94faa DT |
1197 | |
1198 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
1199 | error = gfs2_glock_nq(ghs); | |
1200 | if (error) | |
1201 | goto fail; | |
1202 | ||
1203 | error = create_ok(dip, name, mode); | |
1204 | if (error) | |
1205 | goto fail_gunlock; | |
1206 | ||
1207 | error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino); | |
1208 | if (error) | |
1209 | goto fail_gunlock; | |
1210 | ||
1211 | error = alloc_dinode(dip, ul); | |
1212 | if (error) | |
1213 | goto fail_gunlock; | |
1214 | ||
1215 | if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) { | |
1216 | gfs2_glock_dq(ghs); | |
1217 | ||
320dd101 SW |
1218 | error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, |
1219 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, | |
1220 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
1221 | if (error) { |
1222 | gfs2_unlinked_put(sdp, ul); | |
7359a19c | 1223 | return ERR_PTR(error); |
b3b94faa DT |
1224 | } |
1225 | ||
1226 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
1227 | error = gfs2_glock_nq(ghs); | |
1228 | if (error) { | |
1229 | gfs2_glock_dq_uninit(ghs + 1); | |
1230 | gfs2_unlinked_put(sdp, ul); | |
7359a19c | 1231 | return ERR_PTR(error); |
b3b94faa DT |
1232 | } |
1233 | ||
1234 | error = create_ok(dip, name, mode); | |
1235 | if (error) | |
1236 | goto fail_gunlock2; | |
1237 | } else { | |
320dd101 SW |
1238 | error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, |
1239 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, | |
1240 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
1241 | if (error) |
1242 | goto fail_gunlock; | |
1243 | } | |
1244 | ||
1245 | error = make_dinode(dip, ghs[1].gh_gl, mode, ul); | |
1246 | if (error) | |
1247 | goto fail_gunlock2; | |
1248 | ||
1249 | error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip); | |
1250 | if (error) | |
1251 | goto fail_gunlock2; | |
1252 | ||
1253 | error = gfs2_inode_refresh(ip); | |
1254 | if (error) | |
1255 | goto fail_iput; | |
1256 | ||
1257 | error = gfs2_acl_create(dip, ip); | |
1258 | if (error) | |
1259 | goto fail_iput; | |
1260 | ||
1261 | error = link_dinode(dip, name, ip, ul); | |
1262 | if (error) | |
1263 | goto fail_iput; | |
1264 | ||
1265 | gfs2_unlinked_put(sdp, ul); | |
1266 | ||
7359a19c SW |
1267 | inode = gfs2_ip2v(ip); |
1268 | gfs2_inode_put(ip); | |
1269 | if (!inode) | |
1270 | return ERR_PTR(-ENOMEM); | |
1271 | return inode; | |
b3b94faa | 1272 | |
320dd101 | 1273 | fail_iput: |
b3b94faa DT |
1274 | gfs2_inode_put(ip); |
1275 | ||
320dd101 | 1276 | fail_gunlock2: |
b3b94faa DT |
1277 | gfs2_glock_dq_uninit(ghs + 1); |
1278 | ||
320dd101 | 1279 | fail_gunlock: |
b3b94faa DT |
1280 | gfs2_glock_dq(ghs); |
1281 | ||
320dd101 | 1282 | fail: |
b3b94faa | 1283 | gfs2_unlinked_put(sdp, ul); |
7359a19c | 1284 | return ERR_PTR(error); |
b3b94faa DT |
1285 | } |
1286 | ||
1287 | /** | |
1288 | * gfs2_unlinki - Unlink a file | |
1289 | * @dip: The inode of the directory | |
1290 | * @name: The name of the file to be unlinked | |
1291 | * @ip: The inode of the file to be removed | |
1292 | * | |
1293 | * Assumes Glocks on both dip and ip are held. | |
1294 | * | |
1295 | * Returns: errno | |
1296 | */ | |
1297 | ||
1298 | int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name, | |
1299 | struct gfs2_inode *ip, struct gfs2_unlinked *ul) | |
1300 | { | |
1301 | struct gfs2_sbd *sdp = dip->i_sbd; | |
1302 | int error; | |
1303 | ||
1304 | error = gfs2_dir_del(dip, name); | |
1305 | if (error) | |
1306 | return error; | |
1307 | ||
1308 | error = gfs2_change_nlink(ip, -1); | |
1309 | if (error) | |
1310 | return error; | |
1311 | ||
1312 | /* If this inode is being unlinked from the directory structure, | |
1313 | we need to mark that in the log so that it isn't lost during | |
1314 | a crash. */ | |
1315 | ||
1316 | if (!ip->i_di.di_nlink) { | |
1317 | ul->ul_ut.ut_inum = ip->i_num; | |
1318 | error = gfs2_unlinked_ondisk_add(sdp, ul); | |
1319 | if (!error) | |
1320 | set_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
1321 | } | |
1322 | ||
1323 | return error; | |
1324 | } | |
1325 | ||
1326 | /** | |
1327 | * gfs2_rmdiri - Remove a directory | |
1328 | * @dip: The parent directory of the directory to be removed | |
1329 | * @name: The name of the directory to be removed | |
1330 | * @ip: The GFS2 inode of the directory to be removed | |
1331 | * | |
1332 | * Assumes Glocks on dip and ip are held | |
1333 | * | |
1334 | * Returns: errno | |
1335 | */ | |
1336 | ||
1337 | int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name, | |
1338 | struct gfs2_inode *ip, struct gfs2_unlinked *ul) | |
1339 | { | |
1340 | struct gfs2_sbd *sdp = dip->i_sbd; | |
1341 | struct qstr dotname; | |
1342 | int error; | |
1343 | ||
1344 | if (ip->i_di.di_entries != 2) { | |
1345 | if (gfs2_consist_inode(ip)) | |
1346 | gfs2_dinode_print(&ip->i_di); | |
1347 | return -EIO; | |
1348 | } | |
1349 | ||
1350 | error = gfs2_dir_del(dip, name); | |
1351 | if (error) | |
1352 | return error; | |
1353 | ||
1354 | error = gfs2_change_nlink(dip, -1); | |
1355 | if (error) | |
1356 | return error; | |
1357 | ||
71b86f56 | 1358 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
1359 | error = gfs2_dir_del(ip, &dotname); |
1360 | if (error) | |
1361 | return error; | |
1362 | ||
1363 | dotname.len = 2; | |
1364 | dotname.name = ".."; | |
c752666c | 1365 | dotname.hash = gfs2_disk_hash(dotname.name, dotname.len); |
b3b94faa DT |
1366 | error = gfs2_dir_del(ip, &dotname); |
1367 | if (error) | |
1368 | return error; | |
1369 | ||
1370 | error = gfs2_change_nlink(ip, -2); | |
1371 | if (error) | |
1372 | return error; | |
1373 | ||
1374 | /* This inode is being unlinked from the directory structure and | |
1375 | we need to mark that in the log so that it isn't lost during | |
1376 | a crash. */ | |
1377 | ||
1378 | ul->ul_ut.ut_inum = ip->i_num; | |
1379 | error = gfs2_unlinked_ondisk_add(sdp, ul); | |
1380 | if (!error) | |
1381 | set_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
1382 | ||
1383 | return error; | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1388 | * @dip: the directory | |
1389 | * @name: the name of the file | |
1390 | * @ip: the inode | |
1391 | * | |
1392 | * Assumes that the lock on (at least) @dip is held. | |
1393 | * | |
1394 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1395 | */ | |
1396 | ||
1397 | int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name, | |
1398 | struct gfs2_inode *ip) | |
1399 | { | |
1400 | struct gfs2_inum inum; | |
1401 | unsigned int type; | |
1402 | int error; | |
1403 | ||
1404 | if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode)) | |
1405 | return -EPERM; | |
1406 | ||
1407 | if ((dip->i_di.di_mode & S_ISVTX) && | |
1408 | dip->i_di.di_uid != current->fsuid && | |
1409 | ip->i_di.di_uid != current->fsuid && | |
1410 | !capable(CAP_FOWNER)) | |
1411 | return -EPERM; | |
1412 | ||
1413 | if (IS_APPEND(dip->i_vnode)) | |
1414 | return -EPERM; | |
1415 | ||
1416 | error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL); | |
1417 | if (error) | |
1418 | return error; | |
1419 | ||
c752666c | 1420 | error = gfs2_dir_search(dip->i_vnode, name, &inum, &type); |
b3b94faa DT |
1421 | if (error) |
1422 | return error; | |
1423 | ||
1424 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1425 | return -ENOENT; | |
1426 | ||
1427 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1428 | gfs2_consist_inode(dip); | |
1429 | return -EIO; | |
1430 | } | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1437 | * @this: move this | |
1438 | * @to: to here | |
1439 | * | |
1440 | * Follow @to back to the root and make sure we don't encounter @this | |
1441 | * Assumes we already hold the rename lock. | |
1442 | * | |
1443 | * Returns: errno | |
1444 | */ | |
1445 | ||
1446 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1447 | { | |
7359a19c | 1448 | struct inode *dir = to->i_vnode; |
c9fd4307 | 1449 | struct super_block *sb = dir->i_sb; |
7359a19c | 1450 | struct inode *tmp; |
b3b94faa DT |
1451 | struct qstr dotdot; |
1452 | int error = 0; | |
1453 | ||
71b86f56 | 1454 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1455 | |
7359a19c | 1456 | igrab(dir); |
b3b94faa DT |
1457 | |
1458 | for (;;) { | |
7359a19c | 1459 | if (dir == this->i_vnode) { |
b3b94faa DT |
1460 | error = -EINVAL; |
1461 | break; | |
1462 | } | |
c9fd4307 | 1463 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1464 | error = 0; |
1465 | break; | |
1466 | } | |
1467 | ||
c752666c SW |
1468 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1469 | if (IS_ERR(tmp)) { | |
1470 | error = PTR_ERR(tmp); | |
b3b94faa | 1471 | break; |
c752666c | 1472 | } |
b3b94faa | 1473 | |
7359a19c SW |
1474 | iput(dir); |
1475 | dir = tmp; | |
b3b94faa DT |
1476 | } |
1477 | ||
7359a19c | 1478 | iput(dir); |
b3b94faa DT |
1479 | |
1480 | return error; | |
1481 | } | |
1482 | ||
1483 | /** | |
1484 | * gfs2_readlinki - return the contents of a symlink | |
1485 | * @ip: the symlink's inode | |
1486 | * @buf: a pointer to the buffer to be filled | |
1487 | * @len: a pointer to the length of @buf | |
1488 | * | |
1489 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1490 | * to be freed by the caller. | |
1491 | * | |
1492 | * Returns: errno | |
1493 | */ | |
1494 | ||
1495 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1496 | { | |
1497 | struct gfs2_holder i_gh; | |
1498 | struct buffer_head *dibh; | |
1499 | unsigned int x; | |
1500 | int error; | |
1501 | ||
1502 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1503 | error = gfs2_glock_nq_atime(&i_gh); | |
1504 | if (error) { | |
1505 | gfs2_holder_uninit(&i_gh); | |
1506 | return error; | |
1507 | } | |
1508 | ||
1509 | if (!ip->i_di.di_size) { | |
1510 | gfs2_consist_inode(ip); | |
1511 | error = -EIO; | |
1512 | goto out; | |
1513 | } | |
1514 | ||
1515 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1516 | if (error) | |
1517 | goto out; | |
1518 | ||
1519 | x = ip->i_di.di_size + 1; | |
1520 | if (x > *len) { | |
1521 | *buf = kmalloc(x, GFP_KERNEL); | |
1522 | if (!*buf) { | |
1523 | error = -ENOMEM; | |
1524 | goto out_brelse; | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1529 | *len = x; | |
1530 | ||
1531 | out_brelse: | |
1532 | brelse(dibh); | |
1533 | ||
1534 | out: | |
1535 | gfs2_glock_dq_uninit(&i_gh); | |
1536 | ||
1537 | return error; | |
1538 | } | |
1539 | ||
1540 | /** | |
1541 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1542 | * conditionally update the inode's atime | |
1543 | * @gh: the holder to acquire | |
1544 | * | |
1545 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1546 | * Update if the difference between the current time and the inode's current | |
1547 | * atime is greater than an interval specified at mount. | |
1548 | * | |
1549 | * Returns: errno | |
1550 | */ | |
1551 | ||
1552 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1553 | { | |
1554 | struct gfs2_glock *gl = gh->gh_gl; | |
1555 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1556 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
1557 | int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
1558 | unsigned int state; | |
1559 | int flags; | |
1560 | int error; | |
1561 | ||
1562 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1563 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1564 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1565 | return -EINVAL; | |
1566 | ||
1567 | state = gh->gh_state; | |
1568 | flags = gh->gh_flags; | |
1569 | ||
1570 | error = gfs2_glock_nq(gh); | |
1571 | if (error) | |
1572 | return error; | |
1573 | ||
1574 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1575 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1576 | return 0; | |
1577 | ||
1578 | curtime = get_seconds(); | |
1579 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1580 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1581 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1582 | gh); | |
b3b94faa DT |
1583 | error = gfs2_glock_nq(gh); |
1584 | if (error) | |
1585 | return error; | |
1586 | ||
1587 | /* Verify that atime hasn't been updated while we were | |
1588 | trying to get exclusive lock. */ | |
1589 | ||
1590 | curtime = get_seconds(); | |
1591 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1592 | struct buffer_head *dibh; | |
1593 | ||
1594 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1595 | if (error == -EROFS) | |
1596 | return 0; | |
1597 | if (error) | |
1598 | goto fail; | |
1599 | ||
1600 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1601 | if (error) | |
1602 | goto fail_end_trans; | |
1603 | ||
1604 | ip->i_di.di_atime = curtime; | |
1605 | ||
d4e9c4c3 | 1606 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1607 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1608 | brelse(dibh); | |
1609 | ||
1610 | gfs2_trans_end(sdp); | |
1611 | } | |
1612 | ||
1613 | /* If someone else has asked for the glock, | |
1614 | unlock and let them have it. Then reacquire | |
1615 | in the original state. */ | |
1616 | if (gfs2_glock_is_blocking(gl)) { | |
1617 | gfs2_glock_dq(gh); | |
1618 | gfs2_holder_reinit(state, flags, gh); | |
1619 | return gfs2_glock_nq(gh); | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | return 0; | |
1624 | ||
1625 | fail_end_trans: | |
1626 | gfs2_trans_end(sdp); | |
1627 | ||
1628 | fail: | |
1629 | gfs2_glock_dq(gh); | |
1630 | ||
1631 | return error; | |
1632 | } | |
1633 | ||
1634 | /** | |
1635 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1636 | * @arg_a: the first structure | |
1637 | * @arg_b: the second structure | |
1638 | * | |
1639 | * Returns: 1 if A > B | |
1640 | * -1 if A < B | |
1641 | * 0 if A = B | |
1642 | */ | |
1643 | ||
1644 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1645 | { | |
1646 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1647 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1648 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1649 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1650 | int ret = 0; | |
1651 | ||
1652 | if (a->ln_number > b->ln_number) | |
1653 | ret = 1; | |
1654 | else if (a->ln_number < b->ln_number) | |
1655 | ret = -1; | |
1656 | else { | |
1657 | if (gh_a->gh_state == LM_ST_SHARED && | |
1658 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1659 | ret = 1; | |
1660 | else if (gh_a->gh_state == LM_ST_SHARED && | |
1661 | (gh_b->gh_flags & GL_ATIME)) | |
1662 | ret = 1; | |
1663 | } | |
1664 | ||
1665 | return ret; | |
1666 | } | |
1667 | ||
1668 | /** | |
1669 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1670 | * atime update | |
1671 | * @num_gh: the number of structures | |
1672 | * @ghs: an array of struct gfs2_holder structures | |
1673 | * | |
1674 | * Returns: 0 on success (all glocks acquired), | |
1675 | * errno on failure (no glocks acquired) | |
1676 | */ | |
1677 | ||
1678 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1679 | { | |
1680 | struct gfs2_holder **p; | |
1681 | unsigned int x; | |
1682 | int error = 0; | |
1683 | ||
1684 | if (!num_gh) | |
1685 | return 0; | |
1686 | ||
1687 | if (num_gh == 1) { | |
1688 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1689 | if (ghs->gh_flags & GL_ATIME) | |
1690 | error = gfs2_glock_nq_atime(ghs); | |
1691 | else | |
1692 | error = gfs2_glock_nq(ghs); | |
1693 | return error; | |
1694 | } | |
1695 | ||
1696 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1697 | if (!p) | |
1698 | return -ENOMEM; | |
1699 | ||
1700 | for (x = 0; x < num_gh; x++) | |
1701 | p[x] = &ghs[x]; | |
1702 | ||
1703 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1704 | ||
1705 | for (x = 0; x < num_gh; x++) { | |
1706 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1707 | ||
1708 | if (p[x]->gh_flags & GL_ATIME) | |
1709 | error = gfs2_glock_nq_atime(p[x]); | |
1710 | else | |
1711 | error = gfs2_glock_nq(p[x]); | |
1712 | ||
1713 | if (error) { | |
1714 | while (x--) | |
1715 | gfs2_glock_dq(p[x]); | |
1716 | break; | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | kfree(p); | |
1721 | ||
1722 | return error; | |
1723 | } | |
1724 | ||
1725 | /** | |
1726 | * gfs2_try_toss_vnode - See if we can toss a vnode from memory | |
1727 | * @ip: the inode | |
1728 | * | |
1729 | * Returns: 1 if the vnode was tossed | |
1730 | */ | |
1731 | ||
1732 | void gfs2_try_toss_vnode(struct gfs2_inode *ip) | |
1733 | { | |
1734 | struct inode *inode; | |
1735 | ||
1736 | inode = gfs2_ip2v_lookup(ip); | |
1737 | if (!inode) | |
1738 | return; | |
1739 | ||
1740 | d_prune_aliases(inode); | |
1741 | ||
1742 | if (S_ISDIR(ip->i_di.di_mode)) { | |
1743 | struct list_head *head = &inode->i_dentry; | |
1744 | struct dentry *d = NULL; | |
1745 | ||
1746 | spin_lock(&dcache_lock); | |
1747 | if (list_empty(head)) | |
1748 | spin_unlock(&dcache_lock); | |
1749 | else { | |
1750 | d = list_entry(head->next, struct dentry, d_alias); | |
1751 | dget_locked(d); | |
1752 | spin_unlock(&dcache_lock); | |
1753 | ||
1754 | if (have_submounts(d)) | |
1755 | dput(d); | |
1756 | else { | |
1757 | shrink_dcache_parent(d); | |
1758 | dput(d); | |
1759 | d_prune_aliases(inode); | |
1760 | } | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | inode->i_nlink = 0; | |
1765 | iput(inode); | |
1766 | } | |
1767 | ||
1768 | ||
1769 | static int | |
1770 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1771 | { | |
1772 | struct buffer_head *dibh; | |
1773 | int error; | |
1774 | ||
1775 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1776 | if (!error) { | |
1777 | error = inode_setattr(ip->i_vnode, attr); | |
1778 | gfs2_assert_warn(ip->i_sbd, !error); | |
1779 | gfs2_inode_attr_out(ip); | |
1780 | ||
d4e9c4c3 | 1781 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1782 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1783 | brelse(dibh); | |
1784 | } | |
1785 | return error; | |
1786 | } | |
1787 | ||
1788 | /** | |
1789 | * gfs2_setattr_simple - | |
1790 | * @ip: | |
1791 | * @attr: | |
1792 | * | |
1793 | * Called with a reference on the vnode. | |
1794 | * | |
1795 | * Returns: errno | |
1796 | */ | |
1797 | ||
1798 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1799 | { | |
1800 | int error; | |
1801 | ||
5c676f6d | 1802 | if (current->journal_info) |
b3b94faa DT |
1803 | return __gfs2_setattr_simple(ip, attr); |
1804 | ||
1805 | error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0); | |
1806 | if (error) | |
1807 | return error; | |
1808 | ||
1809 | error = __gfs2_setattr_simple(ip, attr); | |
1810 | ||
1811 | gfs2_trans_end(ip->i_sbd); | |
1812 | ||
1813 | return error; | |
1814 | } | |
1815 | ||
1816 | int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd) | |
1817 | { | |
1818 | return permission(inode, mask, nd); | |
1819 | } | |
1820 |