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 | |
bb8d8a6f SW |
41 | struct gfs2_inum_range_host { |
42 | u64 ir_start; | |
43 | u64 ir_length; | |
44 | }; | |
45 | ||
feaa7bba SW |
46 | static int iget_test(struct inode *inode, void *opaque) |
47 | { | |
48 | struct gfs2_inode *ip = GFS2_I(inode); | |
dbb7cae2 | 49 | u64 *no_addr = opaque; |
feaa7bba | 50 | |
dbb7cae2 | 51 | if (ip->i_no_addr == *no_addr && |
1be38679 | 52 | inode->i_private != NULL) |
feaa7bba | 53 | return 1; |
b3b94faa | 54 | |
feaa7bba SW |
55 | return 0; |
56 | } | |
57 | ||
58 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 59 | { |
feaa7bba | 60 | struct gfs2_inode *ip = GFS2_I(inode); |
dbb7cae2 | 61 | u64 *no_addr = opaque; |
b3b94faa | 62 | |
dbb7cae2 SW |
63 | inode->i_ino = (unsigned long)*no_addr; |
64 | ip->i_no_addr = *no_addr; | |
feaa7bba SW |
65 | return 0; |
66 | } | |
b3b94faa | 67 | |
dbb7cae2 | 68 | struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr) |
feaa7bba | 69 | { |
dbb7cae2 SW |
70 | unsigned long hash = (unsigned long)no_addr; |
71 | return ilookup5(sb, hash, iget_test, &no_addr); | |
feaa7bba | 72 | } |
b3b94faa | 73 | |
dbb7cae2 | 74 | static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) |
feaa7bba | 75 | { |
dbb7cae2 SW |
76 | unsigned long hash = (unsigned long)no_addr; |
77 | return iget5_locked(sb, hash, iget_test, iget_set, &no_addr); | |
b3b94faa DT |
78 | } |
79 | ||
80 | /** | |
feaa7bba SW |
81 | * gfs2_inode_lookup - Lookup an inode |
82 | * @sb: The super block | |
dbb7cae2 | 83 | * @no_addr: The inode number |
feaa7bba | 84 | * @type: The type of the inode |
b3b94faa | 85 | * |
feaa7bba | 86 | * Returns: A VFS inode, or an error |
b3b94faa DT |
87 | */ |
88 | ||
dbb7cae2 | 89 | struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned int type) |
b3b94faa | 90 | { |
dbb7cae2 | 91 | struct inode *inode = gfs2_iget(sb, no_addr); |
feaa7bba SW |
92 | struct gfs2_inode *ip = GFS2_I(inode); |
93 | struct gfs2_glock *io_gl; | |
94 | int error; | |
b3b94faa | 95 | |
26d83ded SW |
96 | if (!inode) |
97 | return ERR_PTR(-ENOBUFS); | |
98 | ||
feaa7bba SW |
99 | if (inode->i_state & I_NEW) { |
100 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
c8cdf479 | 101 | umode_t mode; |
bba9dfd8 | 102 | inode->i_private = ip; |
b3b94faa | 103 | |
dbb7cae2 | 104 | error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
feaa7bba SW |
105 | if (unlikely(error)) |
106 | goto fail; | |
107 | ip->i_gl->gl_object = ip; | |
b3b94faa | 108 | |
dbb7cae2 | 109 | error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
feaa7bba SW |
110 | if (unlikely(error)) |
111 | goto fail_put; | |
b3b94faa | 112 | |
bfded27b | 113 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
114 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
115 | if (unlikely(error)) | |
116 | goto fail_iopen; | |
b3b94faa | 117 | |
feaa7bba | 118 | gfs2_glock_put(io_gl); |
c8cdf479 SW |
119 | |
120 | /* | |
121 | * We must read the inode in order to work out its type in | |
122 | * this case. Note that this doesn't happen often as we normally | |
123 | * know the type beforehand. This code path only occurs during | |
124 | * unlinked inode recovery (where it is safe to do this glock, | |
125 | * which is not true in the general case). | |
126 | */ | |
127 | inode->i_mode = mode = DT2IF(type); | |
128 | if (type == DT_UNKNOWN) { | |
129 | struct gfs2_holder gh; | |
130 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
131 | if (unlikely(error)) | |
132 | goto fail_glock; | |
133 | /* Inode is now uptodate */ | |
134 | mode = inode->i_mode; | |
135 | gfs2_glock_dq_uninit(&gh); | |
136 | } | |
137 | ||
138 | if (S_ISREG(mode)) { | |
139 | inode->i_op = &gfs2_file_iops; | |
140 | inode->i_fop = &gfs2_file_fops; | |
141 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
142 | } else if (S_ISDIR(mode)) { | |
143 | inode->i_op = &gfs2_dir_iops; | |
144 | inode->i_fop = &gfs2_dir_fops; | |
145 | } else if (S_ISLNK(mode)) { | |
146 | inode->i_op = &gfs2_symlink_iops; | |
147 | } else { | |
148 | inode->i_op = &gfs2_dev_iops; | |
149 | } | |
150 | ||
feaa7bba SW |
151 | unlock_new_inode(inode); |
152 | } | |
b3b94faa DT |
153 | |
154 | return inode; | |
c8cdf479 SW |
155 | fail_glock: |
156 | gfs2_glock_dq(&ip->i_iopen_gh); | |
feaa7bba SW |
157 | fail_iopen: |
158 | gfs2_glock_put(io_gl); | |
159 | fail_put: | |
160 | ip->i_gl->gl_object = NULL; | |
161 | gfs2_glock_put(ip->i_gl); | |
162 | fail: | |
163 | iput(inode); | |
164 | return ERR_PTR(error); | |
b3b94faa DT |
165 | } |
166 | ||
af339c02 | 167 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
168 | { |
169 | struct gfs2_dinode_host *di = &ip->i_di; | |
170 | const struct gfs2_dinode *str = buf; | |
171 | ||
dbb7cae2 | 172 | if (ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)) { |
af339c02 SW |
173 | if (gfs2_consist_inode(ip)) |
174 | gfs2_dinode_print(ip); | |
175 | return -EIO; | |
176 | } | |
dbb7cae2 | 177 | ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); |
b60623c2 | 178 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 179 | ip->i_inode.i_rdev = 0; |
b60623c2 | 180 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
181 | case S_IFBLK: |
182 | case S_IFCHR: | |
183 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
184 | be32_to_cpu(str->di_minor)); | |
185 | break; | |
186 | }; | |
187 | ||
2933f925 SW |
188 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
189 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
190 | /* |
191 | * We will need to review setting the nlink count here in the | |
192 | * light of the forthcoming ro bind mount work. This is a reminder | |
193 | * to do that. | |
194 | */ | |
195 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 | 196 | di->di_size = be64_to_cpu(str->di_size); |
9e2dbdac | 197 | i_size_write(&ip->i_inode, di->di_size); |
ea744d01 | 198 | di->di_blocks = be64_to_cpu(str->di_blocks); |
9e2dbdac | 199 | gfs2_set_inode_blocks(&ip->i_inode); |
1a7b1eed | 200 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
4bd91ba1 | 201 | ip->i_inode.i_atime.tv_nsec = be32_to_cpu(str->di_atime_nsec); |
1a7b1eed | 202 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); |
4bd91ba1 | 203 | ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec); |
1a7b1eed | 204 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); |
4bd91ba1 | 205 | ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec); |
ea744d01 SW |
206 | |
207 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
208 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
209 | di->di_generation = be64_to_cpu(str->di_generation); | |
210 | ||
211 | di->di_flags = be32_to_cpu(str->di_flags); | |
6b124d8d | 212 | gfs2_set_inode_flags(&ip->i_inode); |
ea744d01 SW |
213 | di->di_height = be16_to_cpu(str->di_height); |
214 | ||
215 | di->di_depth = be16_to_cpu(str->di_depth); | |
216 | di->di_entries = be32_to_cpu(str->di_entries); | |
217 | ||
218 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 219 | return 0; |
ea744d01 SW |
220 | } |
221 | ||
b3b94faa DT |
222 | /** |
223 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
224 | * @ip: The GFS2 inode | |
225 | * | |
226 | * Returns: errno | |
227 | */ | |
228 | ||
229 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
230 | { | |
231 | struct buffer_head *dibh; | |
232 | int error; | |
233 | ||
234 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
235 | if (error) | |
236 | return error; | |
237 | ||
feaa7bba | 238 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
239 | brelse(dibh); |
240 | return -EIO; | |
241 | } | |
242 | ||
af339c02 | 243 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 244 | brelse(dibh); |
bfded27b | 245 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 246 | |
af339c02 | 247 | return error; |
b3b94faa DT |
248 | } |
249 | ||
feaa7bba | 250 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 251 | { |
feaa7bba | 252 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
253 | struct gfs2_alloc *al; |
254 | struct gfs2_rgrpd *rgd; | |
255 | int error; | |
256 | ||
257 | if (ip->i_di.di_blocks != 1) { | |
258 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 259 | gfs2_dinode_print(ip); |
b3b94faa DT |
260 | return -EIO; |
261 | } | |
262 | ||
263 | al = gfs2_alloc_get(ip); | |
264 | ||
265 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
266 | if (error) | |
267 | goto out; | |
268 | ||
269 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
270 | if (error) | |
271 | goto out_qs; | |
272 | ||
dbb7cae2 | 273 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
b3b94faa DT |
274 | if (!rgd) { |
275 | gfs2_consist_inode(ip); | |
276 | error = -EIO; | |
277 | goto out_rindex_relse; | |
278 | } | |
279 | ||
280 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
281 | &al->al_rgd_gh); | |
282 | if (error) | |
283 | goto out_rindex_relse; | |
284 | ||
420b9e5e | 285 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
286 | if (error) |
287 | goto out_rg_gunlock; | |
288 | ||
289 | gfs2_trans_add_gl(ip->i_gl); | |
290 | ||
291 | gfs2_free_di(rgd, ip); | |
292 | ||
b3b94faa DT |
293 | gfs2_trans_end(sdp); |
294 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
295 | ||
feaa7bba | 296 | out_rg_gunlock: |
b3b94faa | 297 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 298 | out_rindex_relse: |
b3b94faa | 299 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 300 | out_qs: |
b3b94faa | 301 | gfs2_quota_unhold(ip); |
36327521 | 302 | out: |
feaa7bba | 303 | gfs2_alloc_put(ip); |
b3b94faa DT |
304 | return error; |
305 | } | |
306 | ||
b3b94faa | 307 | /** |
87d21e07 | 308 | * gfs2_change_nlink - Change nlink count on inode |
b3b94faa DT |
309 | * @ip: The GFS2 inode |
310 | * @diff: The change in the nlink count required | |
311 | * | |
312 | * Returns: errno | |
313 | */ | |
87d21e07 | 314 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
b3b94faa DT |
315 | { |
316 | struct buffer_head *dibh; | |
cd915493 | 317 | u32 nlink; |
b3b94faa DT |
318 | int error; |
319 | ||
4f56110a SW |
320 | BUG_ON(diff != 1 && diff != -1); |
321 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
322 | |
323 | /* If we are reducing the nlink count, but the new value ends up being | |
324 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 325 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 326 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 327 | gfs2_dinode_print(ip); |
b3b94faa DT |
328 | return -EIO; |
329 | } | |
330 | ||
331 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
332 | if (error) | |
333 | return error; | |
334 | ||
4f56110a SW |
335 | if (diff > 0) |
336 | inc_nlink(&ip->i_inode); | |
337 | else | |
338 | drop_nlink(&ip->i_inode); | |
339 | ||
4bd91ba1 | 340 | ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa | 341 | |
d4e9c4c3 | 342 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 343 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 344 | brelse(dibh); |
feaa7bba | 345 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 346 | |
87d21e07 | 347 | if (ip->i_inode.i_nlink == 0) |
ddee7608 | 348 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
87d21e07 | 349 | |
5509826f WC |
350 | return error; |
351 | } | |
352 | ||
c752666c SW |
353 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
354 | { | |
355 | struct qstr qstr; | |
6c93fd1e | 356 | struct inode *inode; |
71b86f56 | 357 | gfs2_str2qstr(&qstr, name); |
6c93fd1e RC |
358 | inode = gfs2_lookupi(dip, &qstr, 1, NULL); |
359 | /* gfs2_lookupi has inconsistent callers: vfs | |
360 | * related routines expect NULL for no entry found, | |
361 | * gfs2_lookup_simple callers expect ENOENT | |
362 | * and do not check for NULL. | |
363 | */ | |
364 | if (inode == NULL) | |
365 | return ERR_PTR(-ENOENT); | |
366 | else | |
367 | return inode; | |
c752666c SW |
368 | } |
369 | ||
370 | ||
b3b94faa DT |
371 | /** |
372 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
373 | * @d_gh: An initialized holder for the directory glock | |
374 | * @name: The name of the inode to look for | |
375 | * @is_root: If 1, ignore the caller's permissions | |
376 | * @i_gh: An uninitialized holder for the new inode glock | |
377 | * | |
d7c103d0 SW |
378 | * This can be called via the VFS filldir function when NFS is doing |
379 | * a readdirplus and the inode which its intending to stat isn't | |
380 | * already in cache. In this case we must not take the directory glock | |
381 | * again, since the readdir call will have already taken that lock. | |
b3b94faa DT |
382 | * |
383 | * Returns: errno | |
384 | */ | |
385 | ||
feaa7bba SW |
386 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
387 | int is_root, struct nameidata *nd) | |
b3b94faa | 388 | { |
c9fd4307 | 389 | struct super_block *sb = dir->i_sb; |
feaa7bba | 390 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 391 | struct gfs2_holder d_gh; |
037bcbb7 | 392 | int error = 0; |
c752666c | 393 | struct inode *inode = NULL; |
d7c103d0 | 394 | int unlock = 0; |
b3b94faa DT |
395 | |
396 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 397 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 398 | |
c752666c SW |
399 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
400 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
401 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
402 | igrab(dir); |
403 | return dir; | |
b3b94faa DT |
404 | } |
405 | ||
d7c103d0 SW |
406 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) { |
407 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
408 | if (error) | |
409 | return ERR_PTR(error); | |
410 | unlock = 1; | |
411 | } | |
b3b94faa DT |
412 | |
413 | if (!is_root) { | |
faf450ef | 414 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
415 | if (error) |
416 | goto out; | |
417 | } | |
418 | ||
dbb7cae2 SW |
419 | inode = gfs2_dir_search(dir, name); |
420 | if (IS_ERR(inode)) | |
421 | error = PTR_ERR(inode); | |
7359a19c | 422 | out: |
d7c103d0 SW |
423 | if (unlock) |
424 | gfs2_glock_dq_uninit(&d_gh); | |
c752666c SW |
425 | if (error == -ENOENT) |
426 | return NULL; | |
d7c103d0 | 427 | return inode ? inode : ERR_PTR(error); |
b3b94faa DT |
428 | } |
429 | ||
bb8d8a6f SW |
430 | static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf) |
431 | { | |
432 | const struct gfs2_inum_range *str = buf; | |
433 | ||
434 | ir->ir_start = be64_to_cpu(str->ir_start); | |
435 | ir->ir_length = be64_to_cpu(str->ir_length); | |
436 | } | |
437 | ||
438 | static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf) | |
439 | { | |
440 | struct gfs2_inum_range *str = buf; | |
441 | ||
442 | str->ir_start = cpu_to_be64(ir->ir_start); | |
443 | str->ir_length = cpu_to_be64(ir->ir_length); | |
444 | } | |
445 | ||
cd915493 | 446 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 447 | { |
feaa7bba | 448 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 449 | struct buffer_head *bh; |
e6972647 | 450 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
451 | int error; |
452 | ||
453 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
454 | if (error) | |
455 | return error; | |
f55ab26a | 456 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
457 | |
458 | error = gfs2_meta_inode_buffer(ip, &bh); | |
459 | if (error) { | |
f55ab26a | 460 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
461 | gfs2_trans_end(sdp); |
462 | return error; | |
463 | } | |
464 | ||
465 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
466 | ||
467 | if (ir.ir_length) { | |
468 | *formal_ino = ir.ir_start++; | |
469 | ir.ir_length--; | |
d4e9c4c3 | 470 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
471 | gfs2_inum_range_out(&ir, |
472 | bh->b_data + sizeof(struct gfs2_dinode)); | |
473 | brelse(bh); | |
f55ab26a | 474 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
475 | gfs2_trans_end(sdp); |
476 | return 0; | |
477 | } | |
478 | ||
479 | brelse(bh); | |
480 | ||
f55ab26a | 481 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
482 | gfs2_trans_end(sdp); |
483 | ||
484 | return 1; | |
485 | } | |
486 | ||
cd915493 | 487 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 488 | { |
feaa7bba SW |
489 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
490 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
491 | struct gfs2_holder gh; |
492 | struct buffer_head *bh; | |
e6972647 | 493 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
494 | int error; |
495 | ||
496 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
497 | if (error) | |
498 | return error; | |
499 | ||
500 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
501 | if (error) | |
502 | goto out; | |
f55ab26a | 503 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
504 | |
505 | error = gfs2_meta_inode_buffer(ip, &bh); | |
506 | if (error) | |
507 | goto out_end_trans; | |
907b9bce | 508 | |
b3b94faa DT |
509 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
510 | ||
511 | if (!ir.ir_length) { | |
512 | struct buffer_head *m_bh; | |
cd915493 | 513 | u64 x, y; |
b44b84d7 | 514 | __be64 z; |
b3b94faa DT |
515 | |
516 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
517 | if (error) | |
518 | goto out_brelse; | |
519 | ||
b44b84d7 AV |
520 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
521 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
522 | ir.ir_start = x; |
523 | ir.ir_length = GFS2_INUM_QUANTUM; | |
524 | x += GFS2_INUM_QUANTUM; | |
525 | if (x < y) | |
526 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 527 | z = cpu_to_be64(x); |
d4e9c4c3 | 528 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 529 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
530 | |
531 | brelse(m_bh); | |
532 | } | |
533 | ||
534 | *formal_ino = ir.ir_start++; | |
535 | ir.ir_length--; | |
536 | ||
d4e9c4c3 | 537 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
538 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
539 | ||
420b9e5e | 540 | out_brelse: |
b3b94faa | 541 | brelse(bh); |
420b9e5e | 542 | out_end_trans: |
f55ab26a | 543 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 544 | gfs2_trans_end(sdp); |
420b9e5e | 545 | out: |
b3b94faa | 546 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
547 | return error; |
548 | } | |
549 | ||
cd915493 | 550 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
551 | { |
552 | int error; | |
553 | ||
554 | error = pick_formal_ino_1(sdp, inum); | |
555 | if (error <= 0) | |
556 | return error; | |
557 | ||
558 | error = pick_formal_ino_2(sdp, inum); | |
559 | ||
560 | return error; | |
561 | } | |
562 | ||
563 | /** | |
564 | * create_ok - OK to create a new on-disk inode here? | |
565 | * @dip: Directory in which dinode is to be created | |
566 | * @name: Name of new dinode | |
567 | * @mode: | |
568 | * | |
569 | * Returns: errno | |
570 | */ | |
571 | ||
feaa7bba | 572 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
573 | unsigned int mode) |
574 | { | |
575 | int error; | |
576 | ||
faf450ef | 577 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
578 | if (error) |
579 | return error; | |
580 | ||
581 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 582 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
583 | return -EPERM; |
584 | ||
dbb7cae2 | 585 | error = gfs2_dir_check(&dip->i_inode, name, NULL); |
b3b94faa DT |
586 | switch (error) { |
587 | case -ENOENT: | |
588 | error = 0; | |
589 | break; | |
590 | case 0: | |
591 | return -EEXIST; | |
592 | default: | |
593 | return error; | |
594 | } | |
595 | ||
cd915493 | 596 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 597 | return -EFBIG; |
4f56110a | 598 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
599 | return -EMLINK; |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
605 | unsigned int *uid, unsigned int *gid) | |
606 | { | |
feaa7bba | 607 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 608 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
609 | if (S_ISDIR(*mode)) |
610 | *mode |= S_ISUID; | |
2933f925 | 611 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 612 | *mode &= ~07111; |
2933f925 | 613 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
614 | } else |
615 | *uid = current->fsuid; | |
616 | ||
b60623c2 | 617 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
618 | if (S_ISDIR(*mode)) |
619 | *mode |= S_ISGID; | |
2933f925 | 620 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
621 | } else |
622 | *gid = current->fsgid; | |
623 | } | |
624 | ||
dbb7cae2 | 625 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) |
b3b94faa | 626 | { |
feaa7bba | 627 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
628 | int error; |
629 | ||
630 | gfs2_alloc_get(dip); | |
631 | ||
632 | dip->i_alloc.al_requested = RES_DINODE; | |
633 | error = gfs2_inplace_reserve(dip); | |
634 | if (error) | |
635 | goto out; | |
636 | ||
feaa7bba | 637 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
638 | if (error) |
639 | goto out_ipreserv; | |
640 | ||
dbb7cae2 | 641 | *no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
642 | |
643 | gfs2_trans_end(sdp); | |
644 | ||
4340fe62 | 645 | out_ipreserv: |
b3b94faa | 646 | gfs2_inplace_release(dip); |
4340fe62 | 647 | out: |
b3b94faa | 648 | gfs2_alloc_put(dip); |
b3b94faa DT |
649 | return error; |
650 | } | |
651 | ||
652 | /** | |
653 | * init_dinode - Fill in a new dinode structure | |
654 | * @dip: the directory this inode is being created in | |
655 | * @gl: The glock covering the new inode | |
656 | * @inum: the inode number | |
657 | * @mode: the file permissions | |
658 | * @uid: | |
659 | * @gid: | |
660 | * | |
661 | */ | |
662 | ||
663 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 664 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 665 | unsigned int uid, unsigned int gid, |
e7f14f4d | 666 | const u64 *generation, dev_t dev) |
b3b94faa | 667 | { |
feaa7bba | 668 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 669 | struct gfs2_dinode *di; |
b3b94faa | 670 | struct buffer_head *dibh; |
4bd91ba1 | 671 | struct timespec tv = CURRENT_TIME; |
b3b94faa DT |
672 | |
673 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 674 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
675 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
676 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
677 | di = (struct gfs2_dinode *)dibh->b_data; |
678 | ||
2442a098 SW |
679 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
680 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
681 | di->di_mode = cpu_to_be32(mode); |
682 | di->di_uid = cpu_to_be32(uid); | |
683 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
684 | di->di_nlink = 0; |
685 | di->di_size = 0; | |
b96ca4fa | 686 | di->di_blocks = cpu_to_be64(1); |
4bd91ba1 | 687 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); |
e7f14f4d SW |
688 | di->di_major = cpu_to_be32(MAJOR(dev)); |
689 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 690 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 691 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 692 | di->di_flags = 0; |
b3b94faa DT |
693 | |
694 | if (S_ISREG(mode)) { | |
695 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
696 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 697 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
698 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
699 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 700 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 701 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
702 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
703 | GFS2_DIF_INHERIT_DIRECTIO); | |
704 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
705 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
706 | } |
707 | ||
b96ca4fa | 708 | di->__pad1 = 0; |
a9583c79 | 709 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 710 | di->di_height = 0; |
b96ca4fa SW |
711 | di->__pad2 = 0; |
712 | di->__pad3 = 0; | |
294caaa3 SW |
713 | di->di_depth = 0; |
714 | di->di_entries = 0; | |
b96ca4fa | 715 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 716 | di->di_eattr = 0; |
4bd91ba1 SW |
717 | di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); |
718 | di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); | |
719 | di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); | |
b96ca4fa SW |
720 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
721 | ||
b3b94faa DT |
722 | brelse(dibh); |
723 | } | |
724 | ||
725 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 726 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 727 | const u64 *generation, dev_t dev) |
b3b94faa | 728 | { |
feaa7bba | 729 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
730 | unsigned int uid, gid; |
731 | int error; | |
732 | ||
733 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
734 | gfs2_alloc_get(dip); |
735 | ||
736 | error = gfs2_quota_lock(dip, uid, gid); | |
737 | if (error) | |
738 | goto out; | |
739 | ||
740 | error = gfs2_quota_check(dip, uid, gid); | |
741 | if (error) | |
742 | goto out_quota; | |
743 | ||
feaa7bba | 744 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
745 | if (error) |
746 | goto out_quota; | |
747 | ||
e7f14f4d | 748 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 749 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
750 | gfs2_trans_end(sdp); |
751 | ||
feaa7bba | 752 | out_quota: |
b3b94faa | 753 | gfs2_quota_unlock(dip); |
feaa7bba | 754 | out: |
b3b94faa | 755 | gfs2_alloc_put(dip); |
b3b94faa DT |
756 | return error; |
757 | } | |
758 | ||
feaa7bba SW |
759 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
760 | struct gfs2_inode *ip) | |
b3b94faa | 761 | { |
feaa7bba | 762 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
763 | struct gfs2_alloc *al; |
764 | int alloc_required; | |
765 | struct buffer_head *dibh; | |
766 | int error; | |
767 | ||
768 | al = gfs2_alloc_get(dip); | |
769 | ||
770 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
771 | if (error) | |
772 | goto fail; | |
773 | ||
feaa7bba | 774 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
775 | if (alloc_required < 0) |
776 | goto fail; | |
b3b94faa | 777 | if (alloc_required) { |
2933f925 | 778 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
779 | if (error) |
780 | goto fail_quota_locks; | |
781 | ||
782 | al->al_requested = sdp->sd_max_dirres; | |
783 | ||
784 | error = gfs2_inplace_reserve(dip); | |
785 | if (error) | |
786 | goto fail_quota_locks; | |
787 | ||
320dd101 | 788 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 789 | al->al_rgd->rd_length + |
907b9bce | 790 | 2 * RES_DINODE + |
b3b94faa DT |
791 | RES_STATFS + RES_QUOTA, 0); |
792 | if (error) | |
793 | goto fail_ipreserv; | |
794 | } else { | |
feaa7bba | 795 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
796 | if (error) |
797 | goto fail_quota_locks; | |
798 | } | |
799 | ||
dbb7cae2 | 800 | error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
801 | if (error) |
802 | goto fail_end_trans; | |
803 | ||
804 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
805 | if (error) | |
806 | goto fail_end_trans; | |
4f56110a | 807 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 808 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 809 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 810 | brelse(dibh); |
b3b94faa DT |
811 | return 0; |
812 | ||
320dd101 | 813 | fail_end_trans: |
b3b94faa DT |
814 | gfs2_trans_end(sdp); |
815 | ||
320dd101 | 816 | fail_ipreserv: |
b3b94faa DT |
817 | if (dip->i_alloc.al_rgd) |
818 | gfs2_inplace_release(dip); | |
819 | ||
320dd101 | 820 | fail_quota_locks: |
b3b94faa DT |
821 | gfs2_quota_unlock(dip); |
822 | ||
320dd101 | 823 | fail: |
b3b94faa | 824 | gfs2_alloc_put(dip); |
b3b94faa DT |
825 | return error; |
826 | } | |
827 | ||
fcb47e0b RH |
828 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
829 | { | |
830 | int err; | |
831 | size_t len; | |
832 | void *value; | |
833 | char *name; | |
834 | struct gfs2_ea_request er; | |
835 | ||
836 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
837 | &name, &value, &len); | |
838 | ||
839 | if (err) { | |
840 | if (err == -EOPNOTSUPP) | |
841 | return 0; | |
842 | return err; | |
843 | } | |
844 | ||
845 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
846 | ||
847 | er.er_type = GFS2_EATYPE_SECURITY; | |
848 | er.er_name = name; | |
849 | er.er_data = value; | |
850 | er.er_name_len = strlen(name); | |
851 | er.er_data_len = len; | |
852 | ||
853 | err = gfs2_ea_set_i(ip, &er); | |
854 | ||
855 | kfree(value); | |
856 | kfree(name); | |
857 | ||
858 | return err; | |
859 | } | |
860 | ||
b3b94faa DT |
861 | /** |
862 | * gfs2_createi - Create a new inode | |
863 | * @ghs: An array of two holders | |
864 | * @name: The name of the new file | |
865 | * @mode: the permissions on the new inode | |
866 | * | |
867 | * @ghs[0] is an initialized holder for the directory | |
868 | * @ghs[1] is the holder for the inode lock | |
869 | * | |
7359a19c | 870 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
871 | * file are held. A transaction has been started and an inplace reservation |
872 | * is held, as well. | |
873 | * | |
7359a19c | 874 | * Returns: An inode |
b3b94faa DT |
875 | */ |
876 | ||
feaa7bba | 877 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 878 | unsigned int mode, dev_t dev) |
b3b94faa | 879 | { |
e1cc8603 | 880 | struct inode *inode = NULL; |
5c676f6d | 881 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
882 | struct inode *dir = &dip->i_inode; |
883 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
dbb7cae2 | 884 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; |
b3b94faa | 885 | int error; |
4340fe62 | 886 | u64 generation; |
b3b94faa DT |
887 | |
888 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 889 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 890 | |
b3b94faa DT |
891 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
892 | error = gfs2_glock_nq(ghs); | |
893 | if (error) | |
894 | goto fail; | |
895 | ||
896 | error = create_ok(dip, name, mode); | |
897 | if (error) | |
898 | goto fail_gunlock; | |
899 | ||
feaa7bba | 900 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
901 | if (error) |
902 | goto fail_gunlock; | |
903 | ||
dbb7cae2 | 904 | error = alloc_dinode(dip, &inum.no_addr, &generation); |
b3b94faa DT |
905 | if (error) |
906 | goto fail_gunlock; | |
907 | ||
28626e20 SW |
908 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
909 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
910 | if (error) | |
911 | goto fail_gunlock; | |
b3b94faa | 912 | |
e7f14f4d | 913 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
914 | if (error) |
915 | goto fail_gunlock2; | |
916 | ||
dbb7cae2 | 917 | inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode)); |
feaa7bba | 918 | if (IS_ERR(inode)) |
b3b94faa DT |
919 | goto fail_gunlock2; |
920 | ||
feaa7bba | 921 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa | 922 | if (error) |
e1cc8603 | 923 | goto fail_gunlock2; |
b3b94faa | 924 | |
feaa7bba | 925 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa | 926 | if (error) |
e1cc8603 | 927 | goto fail_gunlock2; |
b3b94faa | 928 | |
fcb47e0b RH |
929 | error = gfs2_security_init(dip, GFS2_I(inode)); |
930 | if (error) | |
e1cc8603 | 931 | goto fail_gunlock2; |
fcb47e0b | 932 | |
feaa7bba | 933 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa | 934 | if (error) |
e1cc8603 | 935 | goto fail_gunlock2; |
b3b94faa | 936 | |
7359a19c SW |
937 | if (!inode) |
938 | return ERR_PTR(-ENOMEM); | |
939 | return inode; | |
b3b94faa | 940 | |
320dd101 | 941 | fail_gunlock2: |
b3b94faa | 942 | gfs2_glock_dq_uninit(ghs + 1); |
e1cc8603 SW |
943 | if (inode) |
944 | iput(inode); | |
320dd101 | 945 | fail_gunlock: |
b3b94faa | 946 | gfs2_glock_dq(ghs); |
320dd101 | 947 | fail: |
7359a19c | 948 | return ERR_PTR(error); |
b3b94faa DT |
949 | } |
950 | ||
b3b94faa DT |
951 | /** |
952 | * gfs2_rmdiri - Remove a directory | |
953 | * @dip: The parent directory of the directory to be removed | |
954 | * @name: The name of the directory to be removed | |
955 | * @ip: The GFS2 inode of the directory to be removed | |
956 | * | |
957 | * Assumes Glocks on dip and ip are held | |
958 | * | |
959 | * Returns: errno | |
960 | */ | |
961 | ||
feaa7bba SW |
962 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
963 | struct gfs2_inode *ip) | |
b3b94faa | 964 | { |
b3b94faa DT |
965 | struct qstr dotname; |
966 | int error; | |
967 | ||
968 | if (ip->i_di.di_entries != 2) { | |
969 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 970 | gfs2_dinode_print(ip); |
b3b94faa DT |
971 | return -EIO; |
972 | } | |
973 | ||
974 | error = gfs2_dir_del(dip, name); | |
975 | if (error) | |
976 | return error; | |
977 | ||
978 | error = gfs2_change_nlink(dip, -1); | |
979 | if (error) | |
980 | return error; | |
981 | ||
71b86f56 | 982 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
983 | error = gfs2_dir_del(ip, &dotname); |
984 | if (error) | |
985 | return error; | |
986 | ||
feaa7bba | 987 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
988 | error = gfs2_dir_del(ip, &dotname); |
989 | if (error) | |
990 | return error; | |
991 | ||
4f56110a SW |
992 | /* It looks odd, but it really should be done twice */ |
993 | error = gfs2_change_nlink(ip, -1); | |
994 | if (error) | |
995 | return error; | |
996 | ||
997 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
998 | if (error) |
999 | return error; | |
1000 | ||
b3b94faa DT |
1001 | return error; |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1006 | * @dip: the directory | |
1007 | * @name: the name of the file | |
1008 | * @ip: the inode | |
1009 | * | |
1010 | * Assumes that the lock on (at least) @dip is held. | |
1011 | * | |
1012 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1013 | */ | |
1014 | ||
feaa7bba | 1015 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
dbb7cae2 | 1016 | const struct gfs2_inode *ip) |
b3b94faa | 1017 | { |
b3b94faa DT |
1018 | int error; |
1019 | ||
feaa7bba | 1020 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1021 | return -EPERM; |
1022 | ||
b60623c2 | 1023 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1024 | dip->i_inode.i_uid != current->fsuid && |
1025 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1026 | return -EPERM; |
1027 | ||
feaa7bba | 1028 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1029 | return -EPERM; |
1030 | ||
faf450ef | 1031 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1032 | if (error) |
1033 | return error; | |
1034 | ||
dbb7cae2 | 1035 | error = gfs2_dir_check(&dip->i_inode, name, ip); |
b3b94faa DT |
1036 | if (error) |
1037 | return error; | |
1038 | ||
b3b94faa DT |
1039 | return 0; |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1044 | * @this: move this | |
1045 | * @to: to here | |
1046 | * | |
1047 | * Follow @to back to the root and make sure we don't encounter @this | |
1048 | * Assumes we already hold the rename lock. | |
1049 | * | |
1050 | * Returns: errno | |
1051 | */ | |
1052 | ||
1053 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1054 | { | |
feaa7bba | 1055 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1056 | struct super_block *sb = dir->i_sb; |
7359a19c | 1057 | struct inode *tmp; |
b3b94faa DT |
1058 | struct qstr dotdot; |
1059 | int error = 0; | |
1060 | ||
71b86f56 | 1061 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1062 | |
7359a19c | 1063 | igrab(dir); |
b3b94faa DT |
1064 | |
1065 | for (;;) { | |
feaa7bba | 1066 | if (dir == &this->i_inode) { |
b3b94faa DT |
1067 | error = -EINVAL; |
1068 | break; | |
1069 | } | |
c9fd4307 | 1070 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1071 | error = 0; |
1072 | break; | |
1073 | } | |
1074 | ||
c752666c SW |
1075 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1076 | if (IS_ERR(tmp)) { | |
1077 | error = PTR_ERR(tmp); | |
b3b94faa | 1078 | break; |
c752666c | 1079 | } |
b3b94faa | 1080 | |
7359a19c SW |
1081 | iput(dir); |
1082 | dir = tmp; | |
b3b94faa DT |
1083 | } |
1084 | ||
7359a19c | 1085 | iput(dir); |
b3b94faa DT |
1086 | |
1087 | return error; | |
1088 | } | |
1089 | ||
1090 | /** | |
1091 | * gfs2_readlinki - return the contents of a symlink | |
1092 | * @ip: the symlink's inode | |
1093 | * @buf: a pointer to the buffer to be filled | |
1094 | * @len: a pointer to the length of @buf | |
1095 | * | |
1096 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1097 | * to be freed by the caller. | |
1098 | * | |
1099 | * Returns: errno | |
1100 | */ | |
1101 | ||
1102 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1103 | { | |
1104 | struct gfs2_holder i_gh; | |
1105 | struct buffer_head *dibh; | |
1106 | unsigned int x; | |
1107 | int error; | |
1108 | ||
1109 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1110 | error = gfs2_glock_nq_atime(&i_gh); | |
1111 | if (error) { | |
1112 | gfs2_holder_uninit(&i_gh); | |
1113 | return error; | |
1114 | } | |
1115 | ||
1116 | if (!ip->i_di.di_size) { | |
1117 | gfs2_consist_inode(ip); | |
1118 | error = -EIO; | |
1119 | goto out; | |
1120 | } | |
1121 | ||
1122 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1123 | if (error) | |
1124 | goto out; | |
1125 | ||
1126 | x = ip->i_di.di_size + 1; | |
1127 | if (x > *len) { | |
1128 | *buf = kmalloc(x, GFP_KERNEL); | |
1129 | if (!*buf) { | |
1130 | error = -ENOMEM; | |
1131 | goto out_brelse; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1136 | *len = x; | |
1137 | ||
feaa7bba | 1138 | out_brelse: |
b3b94faa | 1139 | brelse(dibh); |
feaa7bba | 1140 | out: |
b3b94faa | 1141 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1142 | return error; |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1147 | * conditionally update the inode's atime | |
1148 | * @gh: the holder to acquire | |
1149 | * | |
1150 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1151 | * Update if the difference between the current time and the inode's current | |
1152 | * atime is greater than an interval specified at mount. | |
1153 | * | |
1154 | * Returns: errno | |
1155 | */ | |
1156 | ||
1157 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1158 | { | |
1159 | struct gfs2_glock *gl = gh->gh_gl; | |
1160 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1161 | struct gfs2_inode *ip = gl->gl_object; |
4bd91ba1 | 1162 | s64 quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1163 | unsigned int state; |
1164 | int flags; | |
1165 | int error; | |
4bd91ba1 | 1166 | struct timespec tv = CURRENT_TIME; |
b3b94faa DT |
1167 | |
1168 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1169 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1170 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1171 | return -EINVAL; | |
1172 | ||
1173 | state = gh->gh_state; | |
1174 | flags = gh->gh_flags; | |
1175 | ||
1176 | error = gfs2_glock_nq(gh); | |
1177 | if (error) | |
1178 | return error; | |
1179 | ||
1180 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1181 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1182 | return 0; | |
1183 | ||
4bd91ba1 | 1184 | if (tv.tv_sec - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1185 | gfs2_glock_dq(gh); |
fd88de56 SW |
1186 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1187 | gh); | |
b3b94faa DT |
1188 | error = gfs2_glock_nq(gh); |
1189 | if (error) | |
1190 | return error; | |
1191 | ||
1192 | /* Verify that atime hasn't been updated while we were | |
1193 | trying to get exclusive lock. */ | |
1194 | ||
4bd91ba1 SW |
1195 | tv = CURRENT_TIME; |
1196 | if (tv.tv_sec - ip->i_inode.i_atime.tv_sec >= quantum) { | |
b3b94faa | 1197 | struct buffer_head *dibh; |
48516ced | 1198 | struct gfs2_dinode *di; |
b3b94faa DT |
1199 | |
1200 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1201 | if (error == -EROFS) | |
1202 | return 0; | |
1203 | if (error) | |
1204 | goto fail; | |
1205 | ||
1206 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1207 | if (error) | |
1208 | goto fail_end_trans; | |
1209 | ||
4bd91ba1 | 1210 | ip->i_inode.i_atime = tv; |
b3b94faa | 1211 | |
d4e9c4c3 | 1212 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1213 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1214 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
4bd91ba1 | 1215 | di->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); |
b3b94faa DT |
1216 | brelse(dibh); |
1217 | ||
1218 | gfs2_trans_end(sdp); | |
1219 | } | |
1220 | ||
1221 | /* If someone else has asked for the glock, | |
1222 | unlock and let them have it. Then reacquire | |
1223 | in the original state. */ | |
1224 | if (gfs2_glock_is_blocking(gl)) { | |
1225 | gfs2_glock_dq(gh); | |
1226 | gfs2_holder_reinit(state, flags, gh); | |
1227 | return gfs2_glock_nq(gh); | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | return 0; | |
1232 | ||
feaa7bba | 1233 | fail_end_trans: |
b3b94faa | 1234 | gfs2_trans_end(sdp); |
feaa7bba | 1235 | fail: |
b3b94faa | 1236 | gfs2_glock_dq(gh); |
b3b94faa DT |
1237 | return error; |
1238 | } | |
1239 | ||
b3b94faa DT |
1240 | static int |
1241 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1242 | { | |
1243 | struct buffer_head *dibh; | |
1244 | int error; | |
1245 | ||
1246 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1247 | if (!error) { | |
feaa7bba SW |
1248 | error = inode_setattr(&ip->i_inode, attr); |
1249 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1250 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1251 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1252 | brelse(dibh); |
1253 | } | |
1254 | return error; | |
1255 | } | |
1256 | ||
1257 | /** | |
1258 | * gfs2_setattr_simple - | |
1259 | * @ip: | |
1260 | * @attr: | |
1261 | * | |
1262 | * Called with a reference on the vnode. | |
1263 | * | |
1264 | * Returns: errno | |
1265 | */ | |
1266 | ||
1267 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1268 | { | |
1269 | int error; | |
1270 | ||
5c676f6d | 1271 | if (current->journal_info) |
b3b94faa DT |
1272 | return __gfs2_setattr_simple(ip, attr); |
1273 | ||
feaa7bba | 1274 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1275 | if (error) |
1276 | return error; | |
1277 | ||
1278 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1279 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1280 | return error; |
1281 | } | |
1282 | ||
bb8d8a6f SW |
1283 | void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) |
1284 | { | |
1285 | const struct gfs2_dinode_host *di = &ip->i_di; | |
1286 | struct gfs2_dinode *str = buf; | |
1287 | ||
1288 | str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
1289 | str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); | |
1290 | str->di_header.__pad0 = 0; | |
1291 | str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); | |
1292 | str->di_header.__pad1 = 0; | |
1293 | str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); | |
1294 | str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); | |
1295 | str->di_mode = cpu_to_be32(ip->i_inode.i_mode); | |
1296 | str->di_uid = cpu_to_be32(ip->i_inode.i_uid); | |
1297 | str->di_gid = cpu_to_be32(ip->i_inode.i_gid); | |
1298 | str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); | |
1299 | str->di_size = cpu_to_be64(di->di_size); | |
1300 | str->di_blocks = cpu_to_be64(di->di_blocks); | |
1301 | str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); | |
1302 | str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); | |
1303 | str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); | |
1304 | ||
1305 | str->di_goal_meta = cpu_to_be64(di->di_goal_meta); | |
1306 | str->di_goal_data = cpu_to_be64(di->di_goal_data); | |
1307 | str->di_generation = cpu_to_be64(di->di_generation); | |
1308 | ||
1309 | str->di_flags = cpu_to_be32(di->di_flags); | |
1310 | str->di_height = cpu_to_be16(di->di_height); | |
1311 | str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && | |
1312 | !(ip->i_di.di_flags & GFS2_DIF_EXHASH) ? | |
1313 | GFS2_FORMAT_DE : 0); | |
1314 | str->di_depth = cpu_to_be16(di->di_depth); | |
1315 | str->di_entries = cpu_to_be32(di->di_entries); | |
1316 | ||
1317 | str->di_eattr = cpu_to_be64(di->di_eattr); | |
4bd91ba1 SW |
1318 | str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); |
1319 | str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); | |
1320 | str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); | |
bb8d8a6f SW |
1321 | } |
1322 | ||
1323 | void gfs2_dinode_print(const struct gfs2_inode *ip) | |
1324 | { | |
1325 | const struct gfs2_dinode_host *di = &ip->i_di; | |
1326 | ||
1327 | printk(KERN_INFO " no_formal_ino = %llu\n", | |
1328 | (unsigned long long)ip->i_no_formal_ino); | |
1329 | printk(KERN_INFO " no_addr = %llu\n", | |
1330 | (unsigned long long)ip->i_no_addr); | |
1331 | printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size); | |
1332 | printk(KERN_INFO " di_blocks = %llu\n", | |
1333 | (unsigned long long)di->di_blocks); | |
1334 | printk(KERN_INFO " di_goal_meta = %llu\n", | |
1335 | (unsigned long long)di->di_goal_meta); | |
1336 | printk(KERN_INFO " di_goal_data = %llu\n", | |
1337 | (unsigned long long)di->di_goal_data); | |
1338 | printk(KERN_INFO " di_flags = 0x%.8X\n", di->di_flags); | |
1339 | printk(KERN_INFO " di_height = %u\n", di->di_height); | |
1340 | printk(KERN_INFO " di_depth = %u\n", di->di_depth); | |
1341 | printk(KERN_INFO " di_entries = %u\n", di->di_entries); | |
1342 | printk(KERN_INFO " di_eattr = %llu\n", | |
1343 | (unsigned long long)di->di_eattr); | |
1344 | } | |
1345 |