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; | |
6c93fd1e | 364 | struct inode *inode; |
71b86f56 | 365 | gfs2_str2qstr(&qstr, name); |
6c93fd1e RC |
366 | inode = gfs2_lookupi(dip, &qstr, 1, NULL); |
367 | /* gfs2_lookupi has inconsistent callers: vfs | |
368 | * related routines expect NULL for no entry found, | |
369 | * gfs2_lookup_simple callers expect ENOENT | |
370 | * and do not check for NULL. | |
371 | */ | |
372 | if (inode == NULL) | |
373 | return ERR_PTR(-ENOENT); | |
374 | else | |
375 | return inode; | |
c752666c SW |
376 | } |
377 | ||
378 | ||
b3b94faa DT |
379 | /** |
380 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
381 | * @d_gh: An initialized holder for the directory glock | |
382 | * @name: The name of the inode to look for | |
383 | * @is_root: If 1, ignore the caller's permissions | |
384 | * @i_gh: An uninitialized holder for the new inode glock | |
385 | * | |
386 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
387 | * @is_root is true. | |
388 | * | |
389 | * Returns: errno | |
390 | */ | |
391 | ||
feaa7bba SW |
392 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
393 | int is_root, struct nameidata *nd) | |
b3b94faa | 394 | { |
c9fd4307 | 395 | struct super_block *sb = dir->i_sb; |
feaa7bba | 396 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 397 | struct gfs2_holder d_gh; |
629a21e7 | 398 | struct gfs2_inum_host inum; |
b3b94faa | 399 | unsigned int type; |
7359a19c | 400 | int error = 0; |
c752666c | 401 | struct inode *inode = NULL; |
b3b94faa DT |
402 | |
403 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 404 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 405 | |
c752666c SW |
406 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
407 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
408 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
409 | igrab(dir); |
410 | return dir; | |
b3b94faa DT |
411 | } |
412 | ||
413 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
414 | if (error) | |
c752666c | 415 | return ERR_PTR(error); |
b3b94faa DT |
416 | |
417 | if (!is_root) { | |
faf450ef | 418 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
419 | if (error) |
420 | goto out; | |
421 | } | |
422 | ||
c752666c | 423 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
424 | if (error) |
425 | goto out; | |
426 | ||
feaa7bba | 427 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 428 | |
7359a19c | 429 | out: |
b3b94faa | 430 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
431 | if (error == -ENOENT) |
432 | return NULL; | |
feaa7bba | 433 | return inode; |
b3b94faa DT |
434 | } |
435 | ||
cd915493 | 436 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 437 | { |
feaa7bba | 438 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 439 | struct buffer_head *bh; |
e6972647 | 440 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
441 | int error; |
442 | ||
443 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
444 | if (error) | |
445 | return error; | |
f55ab26a | 446 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
447 | |
448 | error = gfs2_meta_inode_buffer(ip, &bh); | |
449 | if (error) { | |
f55ab26a | 450 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
451 | gfs2_trans_end(sdp); |
452 | return error; | |
453 | } | |
454 | ||
455 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
456 | ||
457 | if (ir.ir_length) { | |
458 | *formal_ino = ir.ir_start++; | |
459 | ir.ir_length--; | |
d4e9c4c3 | 460 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
461 | gfs2_inum_range_out(&ir, |
462 | bh->b_data + sizeof(struct gfs2_dinode)); | |
463 | brelse(bh); | |
f55ab26a | 464 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
465 | gfs2_trans_end(sdp); |
466 | return 0; | |
467 | } | |
468 | ||
469 | brelse(bh); | |
470 | ||
f55ab26a | 471 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
472 | gfs2_trans_end(sdp); |
473 | ||
474 | return 1; | |
475 | } | |
476 | ||
cd915493 | 477 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 478 | { |
feaa7bba SW |
479 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
480 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
481 | struct gfs2_holder gh; |
482 | struct buffer_head *bh; | |
e6972647 | 483 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
484 | int error; |
485 | ||
486 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
487 | if (error) | |
488 | return error; | |
489 | ||
490 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
491 | if (error) | |
492 | goto out; | |
f55ab26a | 493 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
494 | |
495 | error = gfs2_meta_inode_buffer(ip, &bh); | |
496 | if (error) | |
497 | goto out_end_trans; | |
907b9bce | 498 | |
b3b94faa DT |
499 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
500 | ||
501 | if (!ir.ir_length) { | |
502 | struct buffer_head *m_bh; | |
cd915493 | 503 | u64 x, y; |
b44b84d7 | 504 | __be64 z; |
b3b94faa DT |
505 | |
506 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
507 | if (error) | |
508 | goto out_brelse; | |
509 | ||
b44b84d7 AV |
510 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
511 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
512 | ir.ir_start = x; |
513 | ir.ir_length = GFS2_INUM_QUANTUM; | |
514 | x += GFS2_INUM_QUANTUM; | |
515 | if (x < y) | |
516 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 517 | z = cpu_to_be64(x); |
d4e9c4c3 | 518 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 519 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
520 | |
521 | brelse(m_bh); | |
522 | } | |
523 | ||
524 | *formal_ino = ir.ir_start++; | |
525 | ir.ir_length--; | |
526 | ||
d4e9c4c3 | 527 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
528 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
529 | ||
420b9e5e | 530 | out_brelse: |
b3b94faa | 531 | brelse(bh); |
420b9e5e | 532 | out_end_trans: |
f55ab26a | 533 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 534 | gfs2_trans_end(sdp); |
420b9e5e | 535 | out: |
b3b94faa | 536 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
537 | return error; |
538 | } | |
539 | ||
cd915493 | 540 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
541 | { |
542 | int error; | |
543 | ||
544 | error = pick_formal_ino_1(sdp, inum); | |
545 | if (error <= 0) | |
546 | return error; | |
547 | ||
548 | error = pick_formal_ino_2(sdp, inum); | |
549 | ||
550 | return error; | |
551 | } | |
552 | ||
553 | /** | |
554 | * create_ok - OK to create a new on-disk inode here? | |
555 | * @dip: Directory in which dinode is to be created | |
556 | * @name: Name of new dinode | |
557 | * @mode: | |
558 | * | |
559 | * Returns: errno | |
560 | */ | |
561 | ||
feaa7bba | 562 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
563 | unsigned int mode) |
564 | { | |
565 | int error; | |
566 | ||
faf450ef | 567 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
568 | if (error) |
569 | return error; | |
570 | ||
571 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 572 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
573 | return -EPERM; |
574 | ||
feaa7bba | 575 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
576 | switch (error) { |
577 | case -ENOENT: | |
578 | error = 0; | |
579 | break; | |
580 | case 0: | |
581 | return -EEXIST; | |
582 | default: | |
583 | return error; | |
584 | } | |
585 | ||
cd915493 | 586 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 587 | return -EFBIG; |
4f56110a | 588 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
589 | return -EMLINK; |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
595 | unsigned int *uid, unsigned int *gid) | |
596 | { | |
feaa7bba | 597 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 598 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
599 | if (S_ISDIR(*mode)) |
600 | *mode |= S_ISUID; | |
2933f925 | 601 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 602 | *mode &= ~07111; |
2933f925 | 603 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
604 | } else |
605 | *uid = current->fsuid; | |
606 | ||
b60623c2 | 607 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
608 | if (S_ISDIR(*mode)) |
609 | *mode |= S_ISGID; | |
2933f925 | 610 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
611 | } else |
612 | *gid = current->fsgid; | |
613 | } | |
614 | ||
629a21e7 | 615 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 616 | u64 *generation) |
b3b94faa | 617 | { |
feaa7bba | 618 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
619 | int error; |
620 | ||
621 | gfs2_alloc_get(dip); | |
622 | ||
623 | dip->i_alloc.al_requested = RES_DINODE; | |
624 | error = gfs2_inplace_reserve(dip); | |
625 | if (error) | |
626 | goto out; | |
627 | ||
feaa7bba | 628 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
629 | if (error) |
630 | goto out_ipreserv; | |
631 | ||
4340fe62 | 632 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
633 | |
634 | gfs2_trans_end(sdp); | |
635 | ||
4340fe62 | 636 | out_ipreserv: |
b3b94faa | 637 | gfs2_inplace_release(dip); |
4340fe62 | 638 | out: |
b3b94faa | 639 | gfs2_alloc_put(dip); |
b3b94faa DT |
640 | return error; |
641 | } | |
642 | ||
643 | /** | |
644 | * init_dinode - Fill in a new dinode structure | |
645 | * @dip: the directory this inode is being created in | |
646 | * @gl: The glock covering the new inode | |
647 | * @inum: the inode number | |
648 | * @mode: the file permissions | |
649 | * @uid: | |
650 | * @gid: | |
651 | * | |
652 | */ | |
653 | ||
654 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 655 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 656 | unsigned int uid, unsigned int gid, |
e7f14f4d | 657 | const u64 *generation, dev_t dev) |
b3b94faa | 658 | { |
feaa7bba | 659 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 660 | struct gfs2_dinode *di; |
b3b94faa DT |
661 | struct buffer_head *dibh; |
662 | ||
663 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 664 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
665 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
666 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
667 | di = (struct gfs2_dinode *)dibh->b_data; |
668 | ||
2442a098 SW |
669 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
670 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
671 | di->di_mode = cpu_to_be32(mode); |
672 | di->di_uid = cpu_to_be32(uid); | |
673 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
674 | di->di_nlink = 0; |
675 | di->di_size = 0; | |
b96ca4fa SW |
676 | di->di_blocks = cpu_to_be64(1); |
677 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
678 | di->di_major = cpu_to_be32(MAJOR(dev)); |
679 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 680 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 681 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 682 | di->di_flags = 0; |
b3b94faa DT |
683 | |
684 | if (S_ISREG(mode)) { | |
685 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
686 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 687 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
688 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
689 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 690 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 691 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
692 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
693 | GFS2_DIF_INHERIT_DIRECTIO); | |
694 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
695 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
696 | } |
697 | ||
b96ca4fa | 698 | di->__pad1 = 0; |
a9583c79 | 699 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 700 | di->di_height = 0; |
b96ca4fa SW |
701 | di->__pad2 = 0; |
702 | di->__pad3 = 0; | |
294caaa3 SW |
703 | di->di_depth = 0; |
704 | di->di_entries = 0; | |
b96ca4fa | 705 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 706 | di->di_eattr = 0; |
b96ca4fa SW |
707 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
708 | ||
b3b94faa DT |
709 | brelse(dibh); |
710 | } | |
711 | ||
712 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 713 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 714 | const u64 *generation, dev_t dev) |
b3b94faa | 715 | { |
feaa7bba | 716 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
717 | unsigned int uid, gid; |
718 | int error; | |
719 | ||
720 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
721 | gfs2_alloc_get(dip); |
722 | ||
723 | error = gfs2_quota_lock(dip, uid, gid); | |
724 | if (error) | |
725 | goto out; | |
726 | ||
727 | error = gfs2_quota_check(dip, uid, gid); | |
728 | if (error) | |
729 | goto out_quota; | |
730 | ||
feaa7bba | 731 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
732 | if (error) |
733 | goto out_quota; | |
734 | ||
e7f14f4d | 735 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 736 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
737 | gfs2_trans_end(sdp); |
738 | ||
feaa7bba | 739 | out_quota: |
b3b94faa | 740 | gfs2_quota_unlock(dip); |
feaa7bba | 741 | out: |
b3b94faa | 742 | gfs2_alloc_put(dip); |
b3b94faa DT |
743 | return error; |
744 | } | |
745 | ||
feaa7bba SW |
746 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
747 | struct gfs2_inode *ip) | |
b3b94faa | 748 | { |
feaa7bba | 749 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
750 | struct gfs2_alloc *al; |
751 | int alloc_required; | |
752 | struct buffer_head *dibh; | |
753 | int error; | |
754 | ||
755 | al = gfs2_alloc_get(dip); | |
756 | ||
757 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
758 | if (error) | |
759 | goto fail; | |
760 | ||
feaa7bba | 761 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
762 | if (alloc_required < 0) |
763 | goto fail; | |
b3b94faa | 764 | if (alloc_required) { |
2933f925 | 765 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
766 | if (error) |
767 | goto fail_quota_locks; | |
768 | ||
769 | al->al_requested = sdp->sd_max_dirres; | |
770 | ||
771 | error = gfs2_inplace_reserve(dip); | |
772 | if (error) | |
773 | goto fail_quota_locks; | |
774 | ||
320dd101 | 775 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 776 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 777 | 2 * RES_DINODE + |
b3b94faa DT |
778 | RES_STATFS + RES_QUOTA, 0); |
779 | if (error) | |
780 | goto fail_ipreserv; | |
781 | } else { | |
feaa7bba | 782 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
783 | if (error) |
784 | goto fail_quota_locks; | |
785 | } | |
786 | ||
b60623c2 | 787 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
788 | if (error) |
789 | goto fail_end_trans; | |
790 | ||
791 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
792 | if (error) | |
793 | goto fail_end_trans; | |
4f56110a | 794 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 795 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 796 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 797 | brelse(dibh); |
b3b94faa DT |
798 | return 0; |
799 | ||
320dd101 | 800 | fail_end_trans: |
b3b94faa DT |
801 | gfs2_trans_end(sdp); |
802 | ||
320dd101 | 803 | fail_ipreserv: |
b3b94faa DT |
804 | if (dip->i_alloc.al_rgd) |
805 | gfs2_inplace_release(dip); | |
806 | ||
320dd101 | 807 | fail_quota_locks: |
b3b94faa DT |
808 | gfs2_quota_unlock(dip); |
809 | ||
320dd101 | 810 | fail: |
b3b94faa | 811 | gfs2_alloc_put(dip); |
b3b94faa DT |
812 | return error; |
813 | } | |
814 | ||
fcb47e0b RH |
815 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
816 | { | |
817 | int err; | |
818 | size_t len; | |
819 | void *value; | |
820 | char *name; | |
821 | struct gfs2_ea_request er; | |
822 | ||
823 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
824 | &name, &value, &len); | |
825 | ||
826 | if (err) { | |
827 | if (err == -EOPNOTSUPP) | |
828 | return 0; | |
829 | return err; | |
830 | } | |
831 | ||
832 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
833 | ||
834 | er.er_type = GFS2_EATYPE_SECURITY; | |
835 | er.er_name = name; | |
836 | er.er_data = value; | |
837 | er.er_name_len = strlen(name); | |
838 | er.er_data_len = len; | |
839 | ||
840 | err = gfs2_ea_set_i(ip, &er); | |
841 | ||
842 | kfree(value); | |
843 | kfree(name); | |
844 | ||
845 | return err; | |
846 | } | |
847 | ||
b3b94faa DT |
848 | /** |
849 | * gfs2_createi - Create a new inode | |
850 | * @ghs: An array of two holders | |
851 | * @name: The name of the new file | |
852 | * @mode: the permissions on the new inode | |
853 | * | |
854 | * @ghs[0] is an initialized holder for the directory | |
855 | * @ghs[1] is the holder for the inode lock | |
856 | * | |
7359a19c | 857 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
858 | * file are held. A transaction has been started and an inplace reservation |
859 | * is held, as well. | |
860 | * | |
7359a19c | 861 | * Returns: An inode |
b3b94faa DT |
862 | */ |
863 | ||
feaa7bba | 864 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 865 | unsigned int mode, dev_t dev) |
b3b94faa | 866 | { |
7359a19c | 867 | struct inode *inode; |
5c676f6d | 868 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
869 | struct inode *dir = &dip->i_inode; |
870 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 871 | struct gfs2_inum_host inum; |
b3b94faa | 872 | int error; |
4340fe62 | 873 | u64 generation; |
b3b94faa DT |
874 | |
875 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 876 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 877 | |
b3b94faa DT |
878 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
879 | error = gfs2_glock_nq(ghs); | |
880 | if (error) | |
881 | goto fail; | |
882 | ||
883 | error = create_ok(dip, name, mode); | |
884 | if (error) | |
885 | goto fail_gunlock; | |
886 | ||
feaa7bba | 887 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
888 | if (error) |
889 | goto fail_gunlock; | |
890 | ||
4340fe62 | 891 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
892 | if (error) |
893 | goto fail_gunlock; | |
894 | ||
28626e20 SW |
895 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
896 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
897 | if (error) | |
898 | goto fail_gunlock; | |
b3b94faa | 899 | |
e7f14f4d | 900 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
901 | if (error) |
902 | goto fail_gunlock2; | |
903 | ||
feaa7bba SW |
904 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
905 | if (IS_ERR(inode)) | |
b3b94faa DT |
906 | goto fail_gunlock2; |
907 | ||
feaa7bba | 908 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
909 | if (error) |
910 | goto fail_iput; | |
911 | ||
feaa7bba | 912 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
913 | if (error) |
914 | goto fail_iput; | |
915 | ||
fcb47e0b RH |
916 | error = gfs2_security_init(dip, GFS2_I(inode)); |
917 | if (error) | |
918 | goto fail_iput; | |
919 | ||
feaa7bba | 920 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
921 | if (error) |
922 | goto fail_iput; | |
923 | ||
7359a19c SW |
924 | if (!inode) |
925 | return ERR_PTR(-ENOMEM); | |
926 | return inode; | |
b3b94faa | 927 | |
320dd101 | 928 | fail_iput: |
feaa7bba | 929 | iput(inode); |
320dd101 | 930 | fail_gunlock2: |
b3b94faa | 931 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 932 | fail_gunlock: |
b3b94faa | 933 | gfs2_glock_dq(ghs); |
320dd101 | 934 | fail: |
7359a19c | 935 | return ERR_PTR(error); |
b3b94faa DT |
936 | } |
937 | ||
b3b94faa DT |
938 | /** |
939 | * gfs2_rmdiri - Remove a directory | |
940 | * @dip: The parent directory of the directory to be removed | |
941 | * @name: The name of the directory to be removed | |
942 | * @ip: The GFS2 inode of the directory to be removed | |
943 | * | |
944 | * Assumes Glocks on dip and ip are held | |
945 | * | |
946 | * Returns: errno | |
947 | */ | |
948 | ||
feaa7bba SW |
949 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
950 | struct gfs2_inode *ip) | |
b3b94faa | 951 | { |
b3b94faa DT |
952 | struct qstr dotname; |
953 | int error; | |
954 | ||
955 | if (ip->i_di.di_entries != 2) { | |
956 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 957 | gfs2_dinode_print(ip); |
b3b94faa DT |
958 | return -EIO; |
959 | } | |
960 | ||
961 | error = gfs2_dir_del(dip, name); | |
962 | if (error) | |
963 | return error; | |
964 | ||
965 | error = gfs2_change_nlink(dip, -1); | |
966 | if (error) | |
967 | return error; | |
968 | ||
71b86f56 | 969 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
970 | error = gfs2_dir_del(ip, &dotname); |
971 | if (error) | |
972 | return error; | |
973 | ||
feaa7bba | 974 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
975 | error = gfs2_dir_del(ip, &dotname); |
976 | if (error) | |
977 | return error; | |
978 | ||
4f56110a SW |
979 | /* It looks odd, but it really should be done twice */ |
980 | error = gfs2_change_nlink(ip, -1); | |
981 | if (error) | |
982 | return error; | |
983 | ||
984 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
985 | if (error) |
986 | return error; | |
987 | ||
b3b94faa DT |
988 | return error; |
989 | } | |
990 | ||
991 | /* | |
992 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
993 | * @dip: the directory | |
994 | * @name: the name of the file | |
995 | * @ip: the inode | |
996 | * | |
997 | * Assumes that the lock on (at least) @dip is held. | |
998 | * | |
999 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1000 | */ | |
1001 | ||
feaa7bba | 1002 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1003 | struct gfs2_inode *ip) |
1004 | { | |
629a21e7 | 1005 | struct gfs2_inum_host inum; |
b3b94faa DT |
1006 | unsigned int type; |
1007 | int error; | |
1008 | ||
feaa7bba | 1009 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1010 | return -EPERM; |
1011 | ||
b60623c2 | 1012 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1013 | dip->i_inode.i_uid != current->fsuid && |
1014 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1015 | return -EPERM; |
1016 | ||
feaa7bba | 1017 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1018 | return -EPERM; |
1019 | ||
faf450ef | 1020 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1021 | if (error) |
1022 | return error; | |
1023 | ||
feaa7bba | 1024 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1025 | if (error) |
1026 | return error; | |
1027 | ||
1028 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1029 | return -ENOENT; | |
1030 | ||
b60623c2 | 1031 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
1032 | gfs2_consist_inode(dip); |
1033 | return -EIO; | |
1034 | } | |
1035 | ||
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1041 | * @this: move this | |
1042 | * @to: to here | |
1043 | * | |
1044 | * Follow @to back to the root and make sure we don't encounter @this | |
1045 | * Assumes we already hold the rename lock. | |
1046 | * | |
1047 | * Returns: errno | |
1048 | */ | |
1049 | ||
1050 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1051 | { | |
feaa7bba | 1052 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1053 | struct super_block *sb = dir->i_sb; |
7359a19c | 1054 | struct inode *tmp; |
b3b94faa DT |
1055 | struct qstr dotdot; |
1056 | int error = 0; | |
1057 | ||
71b86f56 | 1058 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1059 | |
7359a19c | 1060 | igrab(dir); |
b3b94faa DT |
1061 | |
1062 | for (;;) { | |
feaa7bba | 1063 | if (dir == &this->i_inode) { |
b3b94faa DT |
1064 | error = -EINVAL; |
1065 | break; | |
1066 | } | |
c9fd4307 | 1067 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1068 | error = 0; |
1069 | break; | |
1070 | } | |
1071 | ||
c752666c SW |
1072 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1073 | if (IS_ERR(tmp)) { | |
1074 | error = PTR_ERR(tmp); | |
b3b94faa | 1075 | break; |
c752666c | 1076 | } |
b3b94faa | 1077 | |
7359a19c SW |
1078 | iput(dir); |
1079 | dir = tmp; | |
b3b94faa DT |
1080 | } |
1081 | ||
7359a19c | 1082 | iput(dir); |
b3b94faa DT |
1083 | |
1084 | return error; | |
1085 | } | |
1086 | ||
1087 | /** | |
1088 | * gfs2_readlinki - return the contents of a symlink | |
1089 | * @ip: the symlink's inode | |
1090 | * @buf: a pointer to the buffer to be filled | |
1091 | * @len: a pointer to the length of @buf | |
1092 | * | |
1093 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1094 | * to be freed by the caller. | |
1095 | * | |
1096 | * Returns: errno | |
1097 | */ | |
1098 | ||
1099 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1100 | { | |
1101 | struct gfs2_holder i_gh; | |
1102 | struct buffer_head *dibh; | |
1103 | unsigned int x; | |
1104 | int error; | |
1105 | ||
1106 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1107 | error = gfs2_glock_nq_atime(&i_gh); | |
1108 | if (error) { | |
1109 | gfs2_holder_uninit(&i_gh); | |
1110 | return error; | |
1111 | } | |
1112 | ||
1113 | if (!ip->i_di.di_size) { | |
1114 | gfs2_consist_inode(ip); | |
1115 | error = -EIO; | |
1116 | goto out; | |
1117 | } | |
1118 | ||
1119 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1120 | if (error) | |
1121 | goto out; | |
1122 | ||
1123 | x = ip->i_di.di_size + 1; | |
1124 | if (x > *len) { | |
1125 | *buf = kmalloc(x, GFP_KERNEL); | |
1126 | if (!*buf) { | |
1127 | error = -ENOMEM; | |
1128 | goto out_brelse; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1133 | *len = x; | |
1134 | ||
feaa7bba | 1135 | out_brelse: |
b3b94faa | 1136 | brelse(dibh); |
feaa7bba | 1137 | out: |
b3b94faa | 1138 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1139 | return error; |
1140 | } | |
1141 | ||
1142 | /** | |
1143 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1144 | * conditionally update the inode's atime | |
1145 | * @gh: the holder to acquire | |
1146 | * | |
1147 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1148 | * Update if the difference between the current time and the inode's current | |
1149 | * atime is greater than an interval specified at mount. | |
1150 | * | |
1151 | * Returns: errno | |
1152 | */ | |
1153 | ||
1154 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1155 | { | |
1156 | struct gfs2_glock *gl = gh->gh_gl; | |
1157 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1158 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1159 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1160 | unsigned int state; |
1161 | int flags; | |
1162 | int error; | |
1163 | ||
1164 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1165 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1166 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | state = gh->gh_state; | |
1170 | flags = gh->gh_flags; | |
1171 | ||
1172 | error = gfs2_glock_nq(gh); | |
1173 | if (error) | |
1174 | return error; | |
1175 | ||
1176 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1177 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1178 | return 0; | |
1179 | ||
1180 | curtime = get_seconds(); | |
1a7b1eed | 1181 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1182 | gfs2_glock_dq(gh); |
fd88de56 SW |
1183 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1184 | gh); | |
b3b94faa DT |
1185 | error = gfs2_glock_nq(gh); |
1186 | if (error) | |
1187 | return error; | |
1188 | ||
1189 | /* Verify that atime hasn't been updated while we were | |
1190 | trying to get exclusive lock. */ | |
1191 | ||
1192 | curtime = get_seconds(); | |
1a7b1eed | 1193 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1194 | struct buffer_head *dibh; |
48516ced | 1195 | struct gfs2_dinode *di; |
b3b94faa DT |
1196 | |
1197 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1198 | if (error == -EROFS) | |
1199 | return 0; | |
1200 | if (error) | |
1201 | goto fail; | |
1202 | ||
1203 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1204 | if (error) | |
1205 | goto fail_end_trans; | |
1206 | ||
1a7b1eed | 1207 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1208 | |
d4e9c4c3 | 1209 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1210 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1211 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1212 | brelse(dibh); |
1213 | ||
1214 | gfs2_trans_end(sdp); | |
1215 | } | |
1216 | ||
1217 | /* If someone else has asked for the glock, | |
1218 | unlock and let them have it. Then reacquire | |
1219 | in the original state. */ | |
1220 | if (gfs2_glock_is_blocking(gl)) { | |
1221 | gfs2_glock_dq(gh); | |
1222 | gfs2_holder_reinit(state, flags, gh); | |
1223 | return gfs2_glock_nq(gh); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | return 0; | |
1228 | ||
feaa7bba | 1229 | fail_end_trans: |
b3b94faa | 1230 | gfs2_trans_end(sdp); |
feaa7bba | 1231 | fail: |
b3b94faa | 1232 | gfs2_glock_dq(gh); |
b3b94faa DT |
1233 | return error; |
1234 | } | |
1235 | ||
b3b94faa DT |
1236 | static int |
1237 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1238 | { | |
1239 | struct buffer_head *dibh; | |
1240 | int error; | |
1241 | ||
1242 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1243 | if (!error) { | |
feaa7bba SW |
1244 | error = inode_setattr(&ip->i_inode, attr); |
1245 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1246 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1247 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1248 | brelse(dibh); |
1249 | } | |
1250 | return error; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * gfs2_setattr_simple - | |
1255 | * @ip: | |
1256 | * @attr: | |
1257 | * | |
1258 | * Called with a reference on the vnode. | |
1259 | * | |
1260 | * Returns: errno | |
1261 | */ | |
1262 | ||
1263 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1264 | { | |
1265 | int error; | |
1266 | ||
5c676f6d | 1267 | if (current->journal_info) |
b3b94faa DT |
1268 | return __gfs2_setattr_simple(ip, attr); |
1269 | ||
feaa7bba | 1270 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1271 | if (error) |
1272 | return error; | |
1273 | ||
1274 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1275 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1276 | return error; |
1277 | } | |
1278 |