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 | ||
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> |
7d308590 | 19 | #include <linux/lm_interface.h> |
fcb47e0b | 20 | #include <linux/security.h> |
b3b94faa DT |
21 | |
22 | #include "gfs2.h" | |
5c676f6d | 23 | #include "incore.h" |
b3b94faa DT |
24 | #include "acl.h" |
25 | #include "bmap.h" | |
26 | #include "dir.h" | |
27 | #include "eattr.h" | |
28 | #include "glock.h" | |
29 | #include "glops.h" | |
30 | #include "inode.h" | |
31 | #include "log.h" | |
32 | #include "meta_io.h" | |
33 | #include "ops_address.h" | |
34 | #include "ops_file.h" | |
35 | #include "ops_inode.h" | |
36 | #include "quota.h" | |
37 | #include "rgrp.h" | |
38 | #include "trans.h" | |
5c676f6d | 39 | #include "util.h" |
b3b94faa | 40 | |
feaa7bba SW |
41 | static int iget_test(struct inode *inode, void *opaque) |
42 | { | |
43 | struct gfs2_inode *ip = GFS2_I(inode); | |
629a21e7 | 44 | struct gfs2_inum_host *inum = opaque; |
feaa7bba | 45 | |
9e2dbdac | 46 | if (ip->i_num.no_addr == inum->no_addr) |
feaa7bba | 47 | return 1; |
b3b94faa | 48 | |
feaa7bba SW |
49 | return 0; |
50 | } | |
51 | ||
52 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 53 | { |
feaa7bba | 54 | struct gfs2_inode *ip = GFS2_I(inode); |
629a21e7 | 55 | struct gfs2_inum_host *inum = opaque; |
b3b94faa | 56 | |
feaa7bba | 57 | ip->i_num = *inum; |
e7c698d7 | 58 | inode->i_ino = inum->no_addr; |
feaa7bba SW |
59 | return 0; |
60 | } | |
b3b94faa | 61 | |
629a21e7 | 62 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
63 | { |
64 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
65 | iget_test, inum); | |
66 | } | |
b3b94faa | 67 | |
629a21e7 | 68 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
69 | { |
70 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
71 | iget_test, iget_set, inum); | |
b3b94faa DT |
72 | } |
73 | ||
74 | /** | |
feaa7bba SW |
75 | * gfs2_inode_lookup - Lookup an inode |
76 | * @sb: The super block | |
77 | * @inum: The inode number | |
78 | * @type: The type of the inode | |
b3b94faa | 79 | * |
feaa7bba | 80 | * Returns: A VFS inode, or an error |
b3b94faa DT |
81 | */ |
82 | ||
629a21e7 | 83 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
b3b94faa | 84 | { |
feaa7bba SW |
85 | struct inode *inode = gfs2_iget(sb, inum); |
86 | struct gfs2_inode *ip = GFS2_I(inode); | |
87 | struct gfs2_glock *io_gl; | |
88 | int error; | |
b3b94faa | 89 | |
26d83ded SW |
90 | if (!inode) |
91 | return ERR_PTR(-ENOBUFS); | |
92 | ||
feaa7bba SW |
93 | if (inode->i_state & I_NEW) { |
94 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
95 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 96 | inode->i_private = ip; |
feaa7bba SW |
97 | inode->i_mode = mode; |
98 | ||
99 | if (S_ISREG(mode)) { | |
100 | inode->i_op = &gfs2_file_iops; | |
101 | inode->i_fop = &gfs2_file_fops; | |
102 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
103 | } else if (S_ISDIR(mode)) { | |
104 | inode->i_op = &gfs2_dir_iops; | |
105 | inode->i_fop = &gfs2_dir_fops; | |
106 | } else if (S_ISLNK(mode)) { | |
107 | inode->i_op = &gfs2_symlink_iops; | |
108 | } else { | |
109 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 110 | } |
b3b94faa | 111 | |
feaa7bba SW |
112 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
113 | if (unlikely(error)) | |
114 | goto fail; | |
115 | ip->i_gl->gl_object = ip; | |
b3b94faa | 116 | |
feaa7bba SW |
117 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
118 | if (unlikely(error)) | |
119 | goto fail_put; | |
b3b94faa | 120 | |
bfded27b | 121 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
122 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
123 | if (unlikely(error)) | |
124 | goto fail_iopen; | |
b3b94faa | 125 | |
feaa7bba SW |
126 | gfs2_glock_put(io_gl); |
127 | unlock_new_inode(inode); | |
128 | } | |
b3b94faa DT |
129 | |
130 | return inode; | |
feaa7bba SW |
131 | fail_iopen: |
132 | gfs2_glock_put(io_gl); | |
133 | fail_put: | |
134 | ip->i_gl->gl_object = NULL; | |
135 | gfs2_glock_put(ip->i_gl); | |
136 | fail: | |
137 | iput(inode); | |
138 | return ERR_PTR(error); | |
b3b94faa DT |
139 | } |
140 | ||
af339c02 | 141 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
142 | { |
143 | struct gfs2_dinode_host *di = &ip->i_di; | |
144 | const struct gfs2_dinode *str = buf; | |
145 | ||
af339c02 SW |
146 | if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { |
147 | if (gfs2_consist_inode(ip)) | |
148 | gfs2_dinode_print(ip); | |
149 | return -EIO; | |
150 | } | |
151 | if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) | |
152 | return -ESTALE; | |
ea744d01 | 153 | |
b60623c2 | 154 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 155 | ip->i_inode.i_rdev = 0; |
b60623c2 | 156 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
157 | case S_IFBLK: |
158 | case S_IFCHR: | |
159 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
160 | be32_to_cpu(str->di_minor)); | |
161 | break; | |
162 | }; | |
163 | ||
2933f925 SW |
164 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
165 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
166 | /* |
167 | * We will need to review setting the nlink count here in the | |
168 | * light of the forthcoming ro bind mount work. This is a reminder | |
169 | * to do that. | |
170 | */ | |
171 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 | 172 | di->di_size = be64_to_cpu(str->di_size); |
9e2dbdac | 173 | i_size_write(&ip->i_inode, di->di_size); |
ea744d01 | 174 | di->di_blocks = be64_to_cpu(str->di_blocks); |
9e2dbdac | 175 | gfs2_set_inode_blocks(&ip->i_inode); |
1a7b1eed SW |
176 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
177 | ip->i_inode.i_atime.tv_nsec = 0; | |
178 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); | |
179 | ip->i_inode.i_mtime.tv_nsec = 0; | |
180 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); | |
181 | ip->i_inode.i_ctime.tv_nsec = 0; | |
ea744d01 SW |
182 | |
183 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
184 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
185 | di->di_generation = be64_to_cpu(str->di_generation); | |
186 | ||
187 | di->di_flags = be32_to_cpu(str->di_flags); | |
6b124d8d | 188 | gfs2_set_inode_flags(&ip->i_inode); |
ea744d01 SW |
189 | di->di_height = be16_to_cpu(str->di_height); |
190 | ||
191 | di->di_depth = be16_to_cpu(str->di_depth); | |
192 | di->di_entries = be32_to_cpu(str->di_entries); | |
193 | ||
194 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 195 | return 0; |
ea744d01 SW |
196 | } |
197 | ||
b3b94faa DT |
198 | /** |
199 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
200 | * @ip: The GFS2 inode | |
201 | * | |
202 | * Returns: errno | |
203 | */ | |
204 | ||
205 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
206 | { | |
207 | struct buffer_head *dibh; | |
208 | int error; | |
209 | ||
210 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
211 | if (error) | |
212 | return error; | |
213 | ||
feaa7bba | 214 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
215 | brelse(dibh); |
216 | return -EIO; | |
217 | } | |
218 | ||
af339c02 | 219 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 220 | brelse(dibh); |
bfded27b | 221 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 222 | |
af339c02 | 223 | return error; |
b3b94faa DT |
224 | } |
225 | ||
feaa7bba | 226 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 227 | { |
feaa7bba | 228 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
229 | struct gfs2_alloc *al; |
230 | struct gfs2_rgrpd *rgd; | |
231 | int error; | |
232 | ||
233 | if (ip->i_di.di_blocks != 1) { | |
234 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 235 | gfs2_dinode_print(ip); |
b3b94faa DT |
236 | return -EIO; |
237 | } | |
238 | ||
239 | al = gfs2_alloc_get(ip); | |
240 | ||
241 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
242 | if (error) | |
243 | goto out; | |
244 | ||
245 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
246 | if (error) | |
247 | goto out_qs; | |
248 | ||
249 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
250 | if (!rgd) { | |
251 | gfs2_consist_inode(ip); | |
252 | error = -EIO; | |
253 | goto out_rindex_relse; | |
254 | } | |
255 | ||
256 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
257 | &al->al_rgd_gh); | |
258 | if (error) | |
259 | goto out_rindex_relse; | |
260 | ||
420b9e5e | 261 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
262 | if (error) |
263 | goto out_rg_gunlock; | |
264 | ||
265 | gfs2_trans_add_gl(ip->i_gl); | |
266 | ||
267 | gfs2_free_di(rgd, ip); | |
268 | ||
b3b94faa DT |
269 | gfs2_trans_end(sdp); |
270 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
271 | ||
feaa7bba | 272 | out_rg_gunlock: |
b3b94faa | 273 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 274 | out_rindex_relse: |
b3b94faa | 275 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 276 | out_qs: |
b3b94faa | 277 | gfs2_quota_unhold(ip); |
36327521 | 278 | out: |
feaa7bba | 279 | gfs2_alloc_put(ip); |
b3b94faa DT |
280 | return error; |
281 | } | |
282 | ||
b3b94faa | 283 | /** |
5509826f | 284 | * gfs2_change_nlink_i - Change nlink count on inode |
b3b94faa DT |
285 | * @ip: The GFS2 inode |
286 | * @diff: The change in the nlink count required | |
287 | * | |
288 | * Returns: errno | |
289 | */ | |
5509826f | 290 | int gfs2_change_nlink_i(struct gfs2_inode *ip, int diff) |
b3b94faa DT |
291 | { |
292 | struct buffer_head *dibh; | |
cd915493 | 293 | u32 nlink; |
b3b94faa DT |
294 | int error; |
295 | ||
4f56110a SW |
296 | BUG_ON(diff != 1 && diff != -1); |
297 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
298 | |
299 | /* If we are reducing the nlink count, but the new value ends up being | |
300 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 301 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 302 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 303 | gfs2_dinode_print(ip); |
b3b94faa DT |
304 | return -EIO; |
305 | } | |
306 | ||
307 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
308 | if (error) | |
309 | return error; | |
310 | ||
4f56110a SW |
311 | if (diff > 0) |
312 | inc_nlink(&ip->i_inode); | |
313 | else | |
314 | drop_nlink(&ip->i_inode); | |
315 | ||
1a7b1eed | 316 | ip->i_inode.i_ctime.tv_sec = get_seconds(); |
b3b94faa | 317 | |
d4e9c4c3 | 318 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 319 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 320 | brelse(dibh); |
feaa7bba | 321 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 322 | |
5509826f WC |
323 | return error; |
324 | } | |
325 | ||
326 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
327 | { | |
328 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; | |
329 | int error; | |
330 | ||
331 | /* update the nlink */ | |
332 | error = gfs2_change_nlink_i(ip, diff); | |
333 | if (error) | |
334 | return error; | |
335 | ||
336 | /* return meta data block back to rg */ | |
4f56110a | 337 | if (ip->i_inode.i_nlink == 0) { |
feaa7bba SW |
338 | struct gfs2_rgrpd *rgd; |
339 | struct gfs2_holder ri_gh, rg_gh; | |
340 | ||
341 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
342 | if (error) | |
343 | goto out; | |
344 | error = -EIO; | |
345 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
346 | if (!rgd) | |
347 | goto out_norgrp; | |
348 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
349 | if (error) | |
350 | goto out_norgrp; | |
351 | ||
352 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
353 | gfs2_glock_dq_uninit(&rg_gh); | |
354 | out_norgrp: | |
355 | gfs2_glock_dq_uninit(&ri_gh); | |
356 | } | |
357 | out: | |
358 | return error; | |
b3b94faa DT |
359 | } |
360 | ||
c752666c SW |
361 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
362 | { | |
363 | struct qstr qstr; | |
71b86f56 | 364 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
365 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
366 | } | |
367 | ||
368 | ||
b3b94faa DT |
369 | /** |
370 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
371 | * @d_gh: An initialized holder for the directory glock | |
372 | * @name: The name of the inode to look for | |
373 | * @is_root: If 1, ignore the caller's permissions | |
374 | * @i_gh: An uninitialized holder for the new inode glock | |
375 | * | |
376 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
377 | * @is_root is true. | |
378 | * | |
379 | * Returns: errno | |
380 | */ | |
381 | ||
feaa7bba SW |
382 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
383 | int is_root, struct nameidata *nd) | |
b3b94faa | 384 | { |
c9fd4307 | 385 | struct super_block *sb = dir->i_sb; |
feaa7bba | 386 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 387 | struct gfs2_holder d_gh; |
629a21e7 | 388 | struct gfs2_inum_host inum; |
b3b94faa | 389 | unsigned int type; |
7359a19c | 390 | int error = 0; |
c752666c | 391 | struct inode *inode = NULL; |
b3b94faa DT |
392 | |
393 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 394 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 395 | |
c752666c SW |
396 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
397 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
398 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
399 | igrab(dir); |
400 | return dir; | |
b3b94faa DT |
401 | } |
402 | ||
403 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
404 | if (error) | |
c752666c | 405 | return ERR_PTR(error); |
b3b94faa DT |
406 | |
407 | if (!is_root) { | |
faf450ef | 408 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
409 | if (error) |
410 | goto out; | |
411 | } | |
412 | ||
c752666c | 413 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
414 | if (error) |
415 | goto out; | |
416 | ||
feaa7bba | 417 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 418 | |
7359a19c | 419 | out: |
b3b94faa | 420 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
421 | if (error == -ENOENT) |
422 | return NULL; | |
feaa7bba | 423 | return inode; |
b3b94faa DT |
424 | } |
425 | ||
cd915493 | 426 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 427 | { |
feaa7bba | 428 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 429 | struct buffer_head *bh; |
e6972647 | 430 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
431 | int error; |
432 | ||
433 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
434 | if (error) | |
435 | return error; | |
f55ab26a | 436 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
437 | |
438 | error = gfs2_meta_inode_buffer(ip, &bh); | |
439 | if (error) { | |
f55ab26a | 440 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
441 | gfs2_trans_end(sdp); |
442 | return error; | |
443 | } | |
444 | ||
445 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
446 | ||
447 | if (ir.ir_length) { | |
448 | *formal_ino = ir.ir_start++; | |
449 | ir.ir_length--; | |
d4e9c4c3 | 450 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
451 | gfs2_inum_range_out(&ir, |
452 | bh->b_data + sizeof(struct gfs2_dinode)); | |
453 | brelse(bh); | |
f55ab26a | 454 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
455 | gfs2_trans_end(sdp); |
456 | return 0; | |
457 | } | |
458 | ||
459 | brelse(bh); | |
460 | ||
f55ab26a | 461 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
462 | gfs2_trans_end(sdp); |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
cd915493 | 467 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 468 | { |
feaa7bba SW |
469 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
470 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
471 | struct gfs2_holder gh; |
472 | struct buffer_head *bh; | |
e6972647 | 473 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
474 | int error; |
475 | ||
476 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
477 | if (error) | |
478 | return error; | |
479 | ||
480 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
481 | if (error) | |
482 | goto out; | |
f55ab26a | 483 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
484 | |
485 | error = gfs2_meta_inode_buffer(ip, &bh); | |
486 | if (error) | |
487 | goto out_end_trans; | |
907b9bce | 488 | |
b3b94faa DT |
489 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
490 | ||
491 | if (!ir.ir_length) { | |
492 | struct buffer_head *m_bh; | |
cd915493 | 493 | u64 x, y; |
b44b84d7 | 494 | __be64 z; |
b3b94faa DT |
495 | |
496 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
497 | if (error) | |
498 | goto out_brelse; | |
499 | ||
b44b84d7 AV |
500 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
501 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
502 | ir.ir_start = x; |
503 | ir.ir_length = GFS2_INUM_QUANTUM; | |
504 | x += GFS2_INUM_QUANTUM; | |
505 | if (x < y) | |
506 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 507 | z = cpu_to_be64(x); |
d4e9c4c3 | 508 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 509 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
510 | |
511 | brelse(m_bh); | |
512 | } | |
513 | ||
514 | *formal_ino = ir.ir_start++; | |
515 | ir.ir_length--; | |
516 | ||
d4e9c4c3 | 517 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
518 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
519 | ||
420b9e5e | 520 | out_brelse: |
b3b94faa | 521 | brelse(bh); |
420b9e5e | 522 | out_end_trans: |
f55ab26a | 523 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 524 | gfs2_trans_end(sdp); |
420b9e5e | 525 | out: |
b3b94faa | 526 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
527 | return error; |
528 | } | |
529 | ||
cd915493 | 530 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
531 | { |
532 | int error; | |
533 | ||
534 | error = pick_formal_ino_1(sdp, inum); | |
535 | if (error <= 0) | |
536 | return error; | |
537 | ||
538 | error = pick_formal_ino_2(sdp, inum); | |
539 | ||
540 | return error; | |
541 | } | |
542 | ||
543 | /** | |
544 | * create_ok - OK to create a new on-disk inode here? | |
545 | * @dip: Directory in which dinode is to be created | |
546 | * @name: Name of new dinode | |
547 | * @mode: | |
548 | * | |
549 | * Returns: errno | |
550 | */ | |
551 | ||
feaa7bba | 552 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
553 | unsigned int mode) |
554 | { | |
555 | int error; | |
556 | ||
faf450ef | 557 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
558 | if (error) |
559 | return error; | |
560 | ||
561 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 562 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
563 | return -EPERM; |
564 | ||
feaa7bba | 565 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
566 | switch (error) { |
567 | case -ENOENT: | |
568 | error = 0; | |
569 | break; | |
570 | case 0: | |
571 | return -EEXIST; | |
572 | default: | |
573 | return error; | |
574 | } | |
575 | ||
cd915493 | 576 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 577 | return -EFBIG; |
4f56110a | 578 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
579 | return -EMLINK; |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
585 | unsigned int *uid, unsigned int *gid) | |
586 | { | |
feaa7bba | 587 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 588 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
589 | if (S_ISDIR(*mode)) |
590 | *mode |= S_ISUID; | |
2933f925 | 591 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 592 | *mode &= ~07111; |
2933f925 | 593 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
594 | } else |
595 | *uid = current->fsuid; | |
596 | ||
b60623c2 | 597 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
598 | if (S_ISDIR(*mode)) |
599 | *mode |= S_ISGID; | |
2933f925 | 600 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
601 | } else |
602 | *gid = current->fsgid; | |
603 | } | |
604 | ||
629a21e7 | 605 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 606 | u64 *generation) |
b3b94faa | 607 | { |
feaa7bba | 608 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
609 | int error; |
610 | ||
611 | gfs2_alloc_get(dip); | |
612 | ||
613 | dip->i_alloc.al_requested = RES_DINODE; | |
614 | error = gfs2_inplace_reserve(dip); | |
615 | if (error) | |
616 | goto out; | |
617 | ||
feaa7bba | 618 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
619 | if (error) |
620 | goto out_ipreserv; | |
621 | ||
4340fe62 | 622 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
623 | |
624 | gfs2_trans_end(sdp); | |
625 | ||
4340fe62 | 626 | out_ipreserv: |
b3b94faa | 627 | gfs2_inplace_release(dip); |
4340fe62 | 628 | out: |
b3b94faa | 629 | gfs2_alloc_put(dip); |
b3b94faa DT |
630 | return error; |
631 | } | |
632 | ||
633 | /** | |
634 | * init_dinode - Fill in a new dinode structure | |
635 | * @dip: the directory this inode is being created in | |
636 | * @gl: The glock covering the new inode | |
637 | * @inum: the inode number | |
638 | * @mode: the file permissions | |
639 | * @uid: | |
640 | * @gid: | |
641 | * | |
642 | */ | |
643 | ||
644 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 645 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 646 | unsigned int uid, unsigned int gid, |
e7f14f4d | 647 | const u64 *generation, dev_t dev) |
b3b94faa | 648 | { |
feaa7bba | 649 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 650 | struct gfs2_dinode *di; |
b3b94faa DT |
651 | struct buffer_head *dibh; |
652 | ||
653 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 654 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
655 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
656 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
657 | di = (struct gfs2_dinode *)dibh->b_data; |
658 | ||
2442a098 SW |
659 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
660 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
661 | di->di_mode = cpu_to_be32(mode); |
662 | di->di_uid = cpu_to_be32(uid); | |
663 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
664 | di->di_nlink = 0; |
665 | di->di_size = 0; | |
b96ca4fa SW |
666 | di->di_blocks = cpu_to_be64(1); |
667 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
668 | di->di_major = cpu_to_be32(MAJOR(dev)); |
669 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 670 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 671 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 672 | di->di_flags = 0; |
b3b94faa DT |
673 | |
674 | if (S_ISREG(mode)) { | |
675 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
676 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 677 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
678 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
679 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 680 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 681 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
682 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
683 | GFS2_DIF_INHERIT_DIRECTIO); | |
684 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
685 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
686 | } |
687 | ||
b96ca4fa | 688 | di->__pad1 = 0; |
a9583c79 | 689 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 690 | di->di_height = 0; |
b96ca4fa SW |
691 | di->__pad2 = 0; |
692 | di->__pad3 = 0; | |
294caaa3 SW |
693 | di->di_depth = 0; |
694 | di->di_entries = 0; | |
b96ca4fa | 695 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 696 | di->di_eattr = 0; |
b96ca4fa SW |
697 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
698 | ||
b3b94faa DT |
699 | brelse(dibh); |
700 | } | |
701 | ||
702 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 703 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 704 | const u64 *generation, dev_t dev) |
b3b94faa | 705 | { |
feaa7bba | 706 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
707 | unsigned int uid, gid; |
708 | int error; | |
709 | ||
710 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
711 | gfs2_alloc_get(dip); |
712 | ||
713 | error = gfs2_quota_lock(dip, uid, gid); | |
714 | if (error) | |
715 | goto out; | |
716 | ||
717 | error = gfs2_quota_check(dip, uid, gid); | |
718 | if (error) | |
719 | goto out_quota; | |
720 | ||
feaa7bba | 721 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
722 | if (error) |
723 | goto out_quota; | |
724 | ||
e7f14f4d | 725 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 726 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
727 | gfs2_trans_end(sdp); |
728 | ||
feaa7bba | 729 | out_quota: |
b3b94faa | 730 | gfs2_quota_unlock(dip); |
feaa7bba | 731 | out: |
b3b94faa | 732 | gfs2_alloc_put(dip); |
b3b94faa DT |
733 | return error; |
734 | } | |
735 | ||
feaa7bba SW |
736 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
737 | struct gfs2_inode *ip) | |
b3b94faa | 738 | { |
feaa7bba | 739 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
740 | struct gfs2_alloc *al; |
741 | int alloc_required; | |
742 | struct buffer_head *dibh; | |
743 | int error; | |
744 | ||
745 | al = gfs2_alloc_get(dip); | |
746 | ||
747 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
748 | if (error) | |
749 | goto fail; | |
750 | ||
feaa7bba | 751 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
752 | if (alloc_required < 0) |
753 | goto fail; | |
b3b94faa | 754 | if (alloc_required) { |
2933f925 | 755 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
756 | if (error) |
757 | goto fail_quota_locks; | |
758 | ||
759 | al->al_requested = sdp->sd_max_dirres; | |
760 | ||
761 | error = gfs2_inplace_reserve(dip); | |
762 | if (error) | |
763 | goto fail_quota_locks; | |
764 | ||
320dd101 | 765 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 766 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 767 | 2 * RES_DINODE + |
b3b94faa DT |
768 | RES_STATFS + RES_QUOTA, 0); |
769 | if (error) | |
770 | goto fail_ipreserv; | |
771 | } else { | |
feaa7bba | 772 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
773 | if (error) |
774 | goto fail_quota_locks; | |
775 | } | |
776 | ||
b60623c2 | 777 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
778 | if (error) |
779 | goto fail_end_trans; | |
780 | ||
781 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
782 | if (error) | |
783 | goto fail_end_trans; | |
4f56110a | 784 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 785 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 786 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 787 | brelse(dibh); |
b3b94faa DT |
788 | return 0; |
789 | ||
320dd101 | 790 | fail_end_trans: |
b3b94faa DT |
791 | gfs2_trans_end(sdp); |
792 | ||
320dd101 | 793 | fail_ipreserv: |
b3b94faa DT |
794 | if (dip->i_alloc.al_rgd) |
795 | gfs2_inplace_release(dip); | |
796 | ||
320dd101 | 797 | fail_quota_locks: |
b3b94faa DT |
798 | gfs2_quota_unlock(dip); |
799 | ||
320dd101 | 800 | fail: |
b3b94faa | 801 | gfs2_alloc_put(dip); |
b3b94faa DT |
802 | return error; |
803 | } | |
804 | ||
fcb47e0b RH |
805 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
806 | { | |
807 | int err; | |
808 | size_t len; | |
809 | void *value; | |
810 | char *name; | |
811 | struct gfs2_ea_request er; | |
812 | ||
813 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
814 | &name, &value, &len); | |
815 | ||
816 | if (err) { | |
817 | if (err == -EOPNOTSUPP) | |
818 | return 0; | |
819 | return err; | |
820 | } | |
821 | ||
822 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
823 | ||
824 | er.er_type = GFS2_EATYPE_SECURITY; | |
825 | er.er_name = name; | |
826 | er.er_data = value; | |
827 | er.er_name_len = strlen(name); | |
828 | er.er_data_len = len; | |
829 | ||
830 | err = gfs2_ea_set_i(ip, &er); | |
831 | ||
832 | kfree(value); | |
833 | kfree(name); | |
834 | ||
835 | return err; | |
836 | } | |
837 | ||
b3b94faa DT |
838 | /** |
839 | * gfs2_createi - Create a new inode | |
840 | * @ghs: An array of two holders | |
841 | * @name: The name of the new file | |
842 | * @mode: the permissions on the new inode | |
843 | * | |
844 | * @ghs[0] is an initialized holder for the directory | |
845 | * @ghs[1] is the holder for the inode lock | |
846 | * | |
7359a19c | 847 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
848 | * file are held. A transaction has been started and an inplace reservation |
849 | * is held, as well. | |
850 | * | |
7359a19c | 851 | * Returns: An inode |
b3b94faa DT |
852 | */ |
853 | ||
feaa7bba | 854 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 855 | unsigned int mode, dev_t dev) |
b3b94faa | 856 | { |
7359a19c | 857 | struct inode *inode; |
5c676f6d | 858 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
859 | struct inode *dir = &dip->i_inode; |
860 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 861 | struct gfs2_inum_host inum; |
b3b94faa | 862 | int error; |
4340fe62 | 863 | u64 generation; |
b3b94faa DT |
864 | |
865 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 866 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 867 | |
b3b94faa DT |
868 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
869 | error = gfs2_glock_nq(ghs); | |
870 | if (error) | |
871 | goto fail; | |
872 | ||
873 | error = create_ok(dip, name, mode); | |
874 | if (error) | |
875 | goto fail_gunlock; | |
876 | ||
feaa7bba | 877 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
878 | if (error) |
879 | goto fail_gunlock; | |
880 | ||
4340fe62 | 881 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
882 | if (error) |
883 | goto fail_gunlock; | |
884 | ||
28626e20 SW |
885 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
886 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
887 | if (error) | |
888 | goto fail_gunlock; | |
b3b94faa | 889 | |
e7f14f4d | 890 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
891 | if (error) |
892 | goto fail_gunlock2; | |
893 | ||
feaa7bba SW |
894 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
895 | if (IS_ERR(inode)) | |
b3b94faa DT |
896 | goto fail_gunlock2; |
897 | ||
feaa7bba | 898 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
899 | if (error) |
900 | goto fail_iput; | |
901 | ||
feaa7bba | 902 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
903 | if (error) |
904 | goto fail_iput; | |
905 | ||
fcb47e0b RH |
906 | error = gfs2_security_init(dip, GFS2_I(inode)); |
907 | if (error) | |
908 | goto fail_iput; | |
909 | ||
feaa7bba | 910 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
911 | if (error) |
912 | goto fail_iput; | |
913 | ||
7359a19c SW |
914 | if (!inode) |
915 | return ERR_PTR(-ENOMEM); | |
916 | return inode; | |
b3b94faa | 917 | |
320dd101 | 918 | fail_iput: |
feaa7bba | 919 | iput(inode); |
320dd101 | 920 | fail_gunlock2: |
b3b94faa | 921 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 922 | fail_gunlock: |
b3b94faa | 923 | gfs2_glock_dq(ghs); |
320dd101 | 924 | fail: |
7359a19c | 925 | return ERR_PTR(error); |
b3b94faa DT |
926 | } |
927 | ||
b3b94faa DT |
928 | /** |
929 | * gfs2_rmdiri - Remove a directory | |
930 | * @dip: The parent directory of the directory to be removed | |
931 | * @name: The name of the directory to be removed | |
932 | * @ip: The GFS2 inode of the directory to be removed | |
933 | * | |
934 | * Assumes Glocks on dip and ip are held | |
935 | * | |
936 | * Returns: errno | |
937 | */ | |
938 | ||
feaa7bba SW |
939 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
940 | struct gfs2_inode *ip) | |
b3b94faa | 941 | { |
b3b94faa DT |
942 | struct qstr dotname; |
943 | int error; | |
944 | ||
945 | if (ip->i_di.di_entries != 2) { | |
946 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 947 | gfs2_dinode_print(ip); |
b3b94faa DT |
948 | return -EIO; |
949 | } | |
950 | ||
951 | error = gfs2_dir_del(dip, name); | |
952 | if (error) | |
953 | return error; | |
954 | ||
955 | error = gfs2_change_nlink(dip, -1); | |
956 | if (error) | |
957 | return error; | |
958 | ||
71b86f56 | 959 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
960 | error = gfs2_dir_del(ip, &dotname); |
961 | if (error) | |
962 | return error; | |
963 | ||
feaa7bba | 964 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
965 | error = gfs2_dir_del(ip, &dotname); |
966 | if (error) | |
967 | return error; | |
968 | ||
4f56110a SW |
969 | /* It looks odd, but it really should be done twice */ |
970 | error = gfs2_change_nlink(ip, -1); | |
971 | if (error) | |
972 | return error; | |
973 | ||
974 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
975 | if (error) |
976 | return error; | |
977 | ||
b3b94faa DT |
978 | return error; |
979 | } | |
980 | ||
981 | /* | |
982 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
983 | * @dip: the directory | |
984 | * @name: the name of the file | |
985 | * @ip: the inode | |
986 | * | |
987 | * Assumes that the lock on (at least) @dip is held. | |
988 | * | |
989 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
990 | */ | |
991 | ||
feaa7bba | 992 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
993 | struct gfs2_inode *ip) |
994 | { | |
629a21e7 | 995 | struct gfs2_inum_host inum; |
b3b94faa DT |
996 | unsigned int type; |
997 | int error; | |
998 | ||
feaa7bba | 999 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1000 | return -EPERM; |
1001 | ||
b60623c2 | 1002 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1003 | dip->i_inode.i_uid != current->fsuid && |
1004 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1005 | return -EPERM; |
1006 | ||
feaa7bba | 1007 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1008 | return -EPERM; |
1009 | ||
faf450ef | 1010 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1011 | if (error) |
1012 | return error; | |
1013 | ||
feaa7bba | 1014 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1015 | if (error) |
1016 | return error; | |
1017 | ||
1018 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1019 | return -ENOENT; | |
1020 | ||
b60623c2 | 1021 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
1022 | gfs2_consist_inode(dip); |
1023 | return -EIO; | |
1024 | } | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1031 | * @this: move this | |
1032 | * @to: to here | |
1033 | * | |
1034 | * Follow @to back to the root and make sure we don't encounter @this | |
1035 | * Assumes we already hold the rename lock. | |
1036 | * | |
1037 | * Returns: errno | |
1038 | */ | |
1039 | ||
1040 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1041 | { | |
feaa7bba | 1042 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1043 | struct super_block *sb = dir->i_sb; |
7359a19c | 1044 | struct inode *tmp; |
b3b94faa DT |
1045 | struct qstr dotdot; |
1046 | int error = 0; | |
1047 | ||
71b86f56 | 1048 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1049 | |
7359a19c | 1050 | igrab(dir); |
b3b94faa DT |
1051 | |
1052 | for (;;) { | |
feaa7bba | 1053 | if (dir == &this->i_inode) { |
b3b94faa DT |
1054 | error = -EINVAL; |
1055 | break; | |
1056 | } | |
c9fd4307 | 1057 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1058 | error = 0; |
1059 | break; | |
1060 | } | |
1061 | ||
c752666c SW |
1062 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1063 | if (IS_ERR(tmp)) { | |
1064 | error = PTR_ERR(tmp); | |
b3b94faa | 1065 | break; |
c752666c | 1066 | } |
b3b94faa | 1067 | |
7359a19c SW |
1068 | iput(dir); |
1069 | dir = tmp; | |
b3b94faa DT |
1070 | } |
1071 | ||
7359a19c | 1072 | iput(dir); |
b3b94faa DT |
1073 | |
1074 | return error; | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * gfs2_readlinki - return the contents of a symlink | |
1079 | * @ip: the symlink's inode | |
1080 | * @buf: a pointer to the buffer to be filled | |
1081 | * @len: a pointer to the length of @buf | |
1082 | * | |
1083 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1084 | * to be freed by the caller. | |
1085 | * | |
1086 | * Returns: errno | |
1087 | */ | |
1088 | ||
1089 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1090 | { | |
1091 | struct gfs2_holder i_gh; | |
1092 | struct buffer_head *dibh; | |
1093 | unsigned int x; | |
1094 | int error; | |
1095 | ||
1096 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1097 | error = gfs2_glock_nq_atime(&i_gh); | |
1098 | if (error) { | |
1099 | gfs2_holder_uninit(&i_gh); | |
1100 | return error; | |
1101 | } | |
1102 | ||
1103 | if (!ip->i_di.di_size) { | |
1104 | gfs2_consist_inode(ip); | |
1105 | error = -EIO; | |
1106 | goto out; | |
1107 | } | |
1108 | ||
1109 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1110 | if (error) | |
1111 | goto out; | |
1112 | ||
1113 | x = ip->i_di.di_size + 1; | |
1114 | if (x > *len) { | |
1115 | *buf = kmalloc(x, GFP_KERNEL); | |
1116 | if (!*buf) { | |
1117 | error = -ENOMEM; | |
1118 | goto out_brelse; | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1123 | *len = x; | |
1124 | ||
feaa7bba | 1125 | out_brelse: |
b3b94faa | 1126 | brelse(dibh); |
feaa7bba | 1127 | out: |
b3b94faa | 1128 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1129 | return error; |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1134 | * conditionally update the inode's atime | |
1135 | * @gh: the holder to acquire | |
1136 | * | |
1137 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1138 | * Update if the difference between the current time and the inode's current | |
1139 | * atime is greater than an interval specified at mount. | |
1140 | * | |
1141 | * Returns: errno | |
1142 | */ | |
1143 | ||
1144 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1145 | { | |
1146 | struct gfs2_glock *gl = gh->gh_gl; | |
1147 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1148 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1149 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1150 | unsigned int state; |
1151 | int flags; | |
1152 | int error; | |
1153 | ||
1154 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1155 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1156 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1157 | return -EINVAL; | |
1158 | ||
1159 | state = gh->gh_state; | |
1160 | flags = gh->gh_flags; | |
1161 | ||
1162 | error = gfs2_glock_nq(gh); | |
1163 | if (error) | |
1164 | return error; | |
1165 | ||
1166 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1167 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1168 | return 0; | |
1169 | ||
1170 | curtime = get_seconds(); | |
1a7b1eed | 1171 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1172 | gfs2_glock_dq(gh); |
fd88de56 SW |
1173 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1174 | gh); | |
b3b94faa DT |
1175 | error = gfs2_glock_nq(gh); |
1176 | if (error) | |
1177 | return error; | |
1178 | ||
1179 | /* Verify that atime hasn't been updated while we were | |
1180 | trying to get exclusive lock. */ | |
1181 | ||
1182 | curtime = get_seconds(); | |
1a7b1eed | 1183 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1184 | struct buffer_head *dibh; |
48516ced | 1185 | struct gfs2_dinode *di; |
b3b94faa DT |
1186 | |
1187 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1188 | if (error == -EROFS) | |
1189 | return 0; | |
1190 | if (error) | |
1191 | goto fail; | |
1192 | ||
1193 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1194 | if (error) | |
1195 | goto fail_end_trans; | |
1196 | ||
1a7b1eed | 1197 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1198 | |
d4e9c4c3 | 1199 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1200 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1201 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1202 | brelse(dibh); |
1203 | ||
1204 | gfs2_trans_end(sdp); | |
1205 | } | |
1206 | ||
1207 | /* If someone else has asked for the glock, | |
1208 | unlock and let them have it. Then reacquire | |
1209 | in the original state. */ | |
1210 | if (gfs2_glock_is_blocking(gl)) { | |
1211 | gfs2_glock_dq(gh); | |
1212 | gfs2_holder_reinit(state, flags, gh); | |
1213 | return gfs2_glock_nq(gh); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | return 0; | |
1218 | ||
feaa7bba | 1219 | fail_end_trans: |
b3b94faa | 1220 | gfs2_trans_end(sdp); |
feaa7bba | 1221 | fail: |
b3b94faa | 1222 | gfs2_glock_dq(gh); |
b3b94faa DT |
1223 | return error; |
1224 | } | |
1225 | ||
b3b94faa DT |
1226 | static int |
1227 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1228 | { | |
1229 | struct buffer_head *dibh; | |
1230 | int error; | |
1231 | ||
1232 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1233 | if (!error) { | |
feaa7bba SW |
1234 | error = inode_setattr(&ip->i_inode, attr); |
1235 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1236 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1237 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1238 | brelse(dibh); |
1239 | } | |
1240 | return error; | |
1241 | } | |
1242 | ||
1243 | /** | |
1244 | * gfs2_setattr_simple - | |
1245 | * @ip: | |
1246 | * @attr: | |
1247 | * | |
1248 | * Called with a reference on the vnode. | |
1249 | * | |
1250 | * Returns: errno | |
1251 | */ | |
1252 | ||
1253 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1254 | { | |
1255 | int error; | |
1256 | ||
5c676f6d | 1257 | if (current->journal_info) |
b3b94faa DT |
1258 | return __gfs2_setattr_simple(ip, attr); |
1259 | ||
feaa7bba | 1260 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1261 | if (error) |
1262 | return error; | |
1263 | ||
1264 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1265 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1266 | return error; |
1267 | } | |
1268 |