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 | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/posix_acl.h> | |
16 | #include <linux/sort.h> | |
5c676f6d | 17 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 18 | #include <linux/crc32.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d SW |
21 | #include "lm_interface.h" |
22 | #include "incore.h" | |
b3b94faa DT |
23 | #include "acl.h" |
24 | #include "bmap.h" | |
25 | #include "dir.h" | |
26 | #include "eattr.h" | |
27 | #include "glock.h" | |
28 | #include "glops.h" | |
29 | #include "inode.h" | |
30 | #include "log.h" | |
31 | #include "meta_io.h" | |
32 | #include "ops_address.h" | |
33 | #include "ops_file.h" | |
34 | #include "ops_inode.h" | |
35 | #include "quota.h" | |
36 | #include "rgrp.h" | |
37 | #include "trans.h" | |
5c676f6d | 38 | #include "util.h" |
b3b94faa DT |
39 | |
40 | /** | |
41 | * inode_attr_in - Copy attributes from the dinode into the VFS inode | |
42 | * @ip: The GFS2 inode (with embedded disk inode data) | |
43 | * @inode: The Linux VFS inode | |
44 | * | |
45 | */ | |
46 | ||
47 | static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode) | |
48 | { | |
49 | inode->i_ino = ip->i_num.no_formal_ino; | |
50 | ||
51 | switch (ip->i_di.di_mode & S_IFMT) { | |
52 | case S_IFBLK: | |
53 | case S_IFCHR: | |
54 | inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); | |
55 | break; | |
56 | default: | |
57 | inode->i_rdev = 0; | |
58 | break; | |
59 | }; | |
60 | ||
61 | inode->i_mode = ip->i_di.di_mode; | |
62 | inode->i_nlink = ip->i_di.di_nlink; | |
63 | inode->i_uid = ip->i_di.di_uid; | |
64 | inode->i_gid = ip->i_di.di_gid; | |
65 | i_size_write(inode, ip->i_di.di_size); | |
66 | inode->i_atime.tv_sec = ip->i_di.di_atime; | |
67 | inode->i_mtime.tv_sec = ip->i_di.di_mtime; | |
68 | inode->i_ctime.tv_sec = ip->i_di.di_ctime; | |
69 | inode->i_atime.tv_nsec = 0; | |
70 | inode->i_mtime.tv_nsec = 0; | |
71 | inode->i_ctime.tv_nsec = 0; | |
72 | inode->i_blksize = PAGE_SIZE; | |
73 | inode->i_blocks = ip->i_di.di_blocks << | |
feaa7bba | 74 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa DT |
75 | |
76 | if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) | |
77 | inode->i_flags |= S_IMMUTABLE; | |
78 | else | |
79 | inode->i_flags &= ~S_IMMUTABLE; | |
80 | ||
81 | if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) | |
82 | inode->i_flags |= S_APPEND; | |
83 | else | |
84 | inode->i_flags &= ~S_APPEND; | |
85 | } | |
86 | ||
87 | /** | |
88 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode | |
89 | * @ip: The GFS2 inode (with embedded disk inode data) | |
90 | * | |
91 | */ | |
92 | ||
93 | void gfs2_inode_attr_in(struct gfs2_inode *ip) | |
94 | { | |
feaa7bba SW |
95 | struct inode *inode = &ip->i_inode; |
96 | inode_attr_in(ip, inode); | |
b3b94faa DT |
97 | } |
98 | ||
99 | /** | |
100 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
101 | * @ip: The GFS2 inode | |
102 | * | |
103 | * Only copy out the attributes that we want the VFS layer | |
104 | * to be able to modify. | |
105 | */ | |
106 | ||
107 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
108 | { | |
feaa7bba | 109 | struct inode *inode = &ip->i_inode; |
b3b94faa | 110 | |
feaa7bba | 111 | gfs2_assert_withdraw(GFS2_SB(inode), |
b3b94faa DT |
112 | (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
113 | ip->i_di.di_mode = inode->i_mode; | |
114 | ip->i_di.di_uid = inode->i_uid; | |
115 | ip->i_di.di_gid = inode->i_gid; | |
116 | ip->i_di.di_atime = inode->i_atime.tv_sec; | |
117 | ip->i_di.di_mtime = inode->i_mtime.tv_sec; | |
118 | ip->i_di.di_ctime = inode->i_ctime.tv_sec; | |
119 | } | |
120 | ||
feaa7bba SW |
121 | static int iget_test(struct inode *inode, void *opaque) |
122 | { | |
123 | struct gfs2_inode *ip = GFS2_I(inode); | |
124 | struct gfs2_inum *inum = opaque; | |
125 | ||
126 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
127 | return 1; | |
b3b94faa | 128 | |
feaa7bba SW |
129 | return 0; |
130 | } | |
131 | ||
132 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 133 | { |
feaa7bba SW |
134 | struct gfs2_inode *ip = GFS2_I(inode); |
135 | struct gfs2_inum *inum = opaque; | |
b3b94faa | 136 | |
feaa7bba SW |
137 | ip->i_num = *inum; |
138 | return 0; | |
139 | } | |
b3b94faa | 140 | |
feaa7bba SW |
141 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum) |
142 | { | |
143 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
144 | iget_test, inum); | |
145 | } | |
b3b94faa | 146 | |
feaa7bba SW |
147 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) |
148 | { | |
149 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
150 | iget_test, iget_set, inum); | |
b3b94faa DT |
151 | } |
152 | ||
153 | /** | |
feaa7bba SW |
154 | * gfs2_inode_lookup - Lookup an inode |
155 | * @sb: The super block | |
156 | * @inum: The inode number | |
157 | * @type: The type of the inode | |
b3b94faa | 158 | * |
feaa7bba | 159 | * Returns: A VFS inode, or an error |
b3b94faa DT |
160 | */ |
161 | ||
feaa7bba | 162 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type) |
b3b94faa | 163 | { |
feaa7bba SW |
164 | struct inode *inode = gfs2_iget(sb, inum); |
165 | struct gfs2_inode *ip = GFS2_I(inode); | |
166 | struct gfs2_glock *io_gl; | |
167 | int error; | |
b3b94faa | 168 | |
feaa7bba SW |
169 | if (inode->i_state & I_NEW) { |
170 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
171 | umode_t mode = DT2IF(type); | |
172 | inode->u.generic_ip = ip; | |
173 | inode->i_mode = mode; | |
174 | ||
175 | if (S_ISREG(mode)) { | |
176 | inode->i_op = &gfs2_file_iops; | |
177 | inode->i_fop = &gfs2_file_fops; | |
178 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
179 | } else if (S_ISDIR(mode)) { | |
180 | inode->i_op = &gfs2_dir_iops; | |
181 | inode->i_fop = &gfs2_dir_fops; | |
182 | } else if (S_ISLNK(mode)) { | |
183 | inode->i_op = &gfs2_symlink_iops; | |
184 | } else { | |
185 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 186 | } |
b3b94faa | 187 | |
feaa7bba SW |
188 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
189 | if (unlikely(error)) | |
190 | goto fail; | |
191 | ip->i_gl->gl_object = ip; | |
b3b94faa | 192 | |
feaa7bba SW |
193 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
194 | if (unlikely(error)) | |
195 | goto fail_put; | |
b3b94faa | 196 | |
feaa7bba SW |
197 | ip->i_vn = ip->i_gl->gl_vn - 1; |
198 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
199 | if (unlikely(error)) | |
200 | goto fail_iopen; | |
b3b94faa | 201 | |
feaa7bba SW |
202 | gfs2_glock_put(io_gl); |
203 | unlock_new_inode(inode); | |
204 | } | |
b3b94faa DT |
205 | |
206 | return inode; | |
feaa7bba SW |
207 | fail_iopen: |
208 | gfs2_glock_put(io_gl); | |
209 | fail_put: | |
210 | ip->i_gl->gl_object = NULL; | |
211 | gfs2_glock_put(ip->i_gl); | |
212 | fail: | |
213 | iput(inode); | |
214 | return ERR_PTR(error); | |
b3b94faa DT |
215 | } |
216 | ||
217 | /** | |
218 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
219 | * @ip: The GFS2 inode | |
220 | * | |
221 | * Returns: errno | |
222 | */ | |
223 | ||
224 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
225 | { | |
226 | struct buffer_head *dibh; | |
227 | int error; | |
228 | ||
229 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
230 | if (error) | |
231 | return error; | |
232 | ||
feaa7bba | 233 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
234 | brelse(dibh); |
235 | return -EIO; | |
236 | } | |
237 | ||
b3b94faa | 238 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
b3b94faa DT |
239 | |
240 | brelse(dibh); | |
241 | ||
242 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
243 | if (gfs2_consist_inode(ip)) | |
244 | gfs2_dinode_print(&ip->i_di); | |
245 | return -EIO; | |
246 | } | |
247 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
248 | return -ESTALE; | |
249 | ||
250 | ip->i_vn = ip->i_gl->gl_vn; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
feaa7bba | 255 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 256 | { |
feaa7bba | 257 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
258 | struct gfs2_alloc *al; |
259 | struct gfs2_rgrpd *rgd; | |
260 | int error; | |
261 | ||
262 | if (ip->i_di.di_blocks != 1) { | |
263 | if (gfs2_consist_inode(ip)) | |
264 | gfs2_dinode_print(&ip->i_di); | |
265 | return -EIO; | |
266 | } | |
267 | ||
268 | al = gfs2_alloc_get(ip); | |
269 | ||
270 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
271 | if (error) | |
272 | goto out; | |
273 | ||
274 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
275 | if (error) | |
276 | goto out_qs; | |
277 | ||
278 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
279 | if (!rgd) { | |
280 | gfs2_consist_inode(ip); | |
281 | error = -EIO; | |
282 | goto out_rindex_relse; | |
283 | } | |
284 | ||
285 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
286 | &al->al_rgd_gh); | |
287 | if (error) | |
288 | goto out_rindex_relse; | |
289 | ||
feaa7bba | 290 | error = gfs2_trans_begin(sdp, RES_RG_BIT + |
b3b94faa DT |
291 | RES_STATFS + RES_QUOTA, 1); |
292 | if (error) | |
293 | goto out_rg_gunlock; | |
294 | ||
295 | gfs2_trans_add_gl(ip->i_gl); | |
296 | ||
297 | gfs2_free_di(rgd, ip); | |
298 | ||
b3b94faa DT |
299 | gfs2_trans_end(sdp); |
300 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
301 | ||
feaa7bba | 302 | out_rg_gunlock: |
b3b94faa | 303 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 304 | out_rindex_relse: |
b3b94faa | 305 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 306 | out_qs: |
b3b94faa | 307 | gfs2_quota_unhold(ip); |
36327521 | 308 | out: |
feaa7bba | 309 | gfs2_alloc_put(ip); |
b3b94faa DT |
310 | return error; |
311 | } | |
312 | ||
b3b94faa DT |
313 | /** |
314 | * gfs2_change_nlink - Change nlink count on inode | |
315 | * @ip: The GFS2 inode | |
316 | * @diff: The change in the nlink count required | |
317 | * | |
318 | * Returns: errno | |
319 | */ | |
320 | ||
321 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
322 | { | |
feaa7bba | 323 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa DT |
324 | struct buffer_head *dibh; |
325 | uint32_t nlink; | |
326 | int error; | |
327 | ||
328 | nlink = ip->i_di.di_nlink + diff; | |
329 | ||
330 | /* If we are reducing the nlink count, but the new value ends up being | |
331 | bigger than the old one, we must have underflowed. */ | |
332 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
333 | if (gfs2_consist_inode(ip)) | |
334 | gfs2_dinode_print(&ip->i_di); | |
335 | return -EIO; | |
336 | } | |
337 | ||
338 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
339 | if (error) | |
340 | return error; | |
341 | ||
342 | ip->i_di.di_nlink = nlink; | |
343 | ip->i_di.di_ctime = get_seconds(); | |
344 | ||
d4e9c4c3 | 345 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
346 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
347 | brelse(dibh); | |
feaa7bba | 348 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 349 | |
feaa7bba SW |
350 | if (ip->i_di.di_nlink == 0) { |
351 | struct gfs2_rgrpd *rgd; | |
352 | struct gfs2_holder ri_gh, rg_gh; | |
353 | ||
354 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
355 | if (error) | |
356 | goto out; | |
357 | error = -EIO; | |
358 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
359 | if (!rgd) | |
360 | goto out_norgrp; | |
361 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
362 | if (error) | |
363 | goto out_norgrp; | |
364 | ||
365 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
366 | gfs2_glock_dq_uninit(&rg_gh); | |
367 | out_norgrp: | |
368 | gfs2_glock_dq_uninit(&ri_gh); | |
369 | } | |
370 | out: | |
371 | return error; | |
b3b94faa DT |
372 | } |
373 | ||
c752666c SW |
374 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
375 | { | |
376 | struct qstr qstr; | |
71b86f56 | 377 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
378 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
379 | } | |
380 | ||
381 | ||
b3b94faa DT |
382 | /** |
383 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
384 | * @d_gh: An initialized holder for the directory glock | |
385 | * @name: The name of the inode to look for | |
386 | * @is_root: If 1, ignore the caller's permissions | |
387 | * @i_gh: An uninitialized holder for the new inode glock | |
388 | * | |
389 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
390 | * @is_root is true. | |
391 | * | |
392 | * Returns: errno | |
393 | */ | |
394 | ||
feaa7bba SW |
395 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
396 | int is_root, struct nameidata *nd) | |
c752666c | 397 | |
b3b94faa | 398 | { |
c9fd4307 | 399 | struct super_block *sb = dir->i_sb; |
feaa7bba | 400 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa DT |
401 | struct gfs2_holder d_gh; |
402 | struct gfs2_inum inum; | |
403 | unsigned int type; | |
7359a19c | 404 | int error = 0; |
c752666c | 405 | struct inode *inode = NULL; |
b3b94faa DT |
406 | |
407 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 408 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 409 | |
c752666c SW |
410 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
411 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
412 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
413 | igrab(dir); |
414 | return dir; | |
b3b94faa DT |
415 | } |
416 | ||
417 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
418 | if (error) | |
c752666c | 419 | return ERR_PTR(error); |
b3b94faa DT |
420 | |
421 | if (!is_root) { | |
faf450ef | 422 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
423 | if (error) |
424 | goto out; | |
425 | } | |
426 | ||
c752666c | 427 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
428 | if (error) |
429 | goto out; | |
430 | ||
feaa7bba | 431 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 432 | |
7359a19c | 433 | out: |
b3b94faa | 434 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
435 | if (error == -ENOENT) |
436 | return NULL; | |
feaa7bba | 437 | return inode; |
b3b94faa DT |
438 | } |
439 | ||
440 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
441 | { | |
feaa7bba | 442 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa DT |
443 | struct buffer_head *bh; |
444 | struct gfs2_inum_range ir; | |
445 | int error; | |
446 | ||
447 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
448 | if (error) | |
449 | return error; | |
f55ab26a | 450 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
451 | |
452 | error = gfs2_meta_inode_buffer(ip, &bh); | |
453 | if (error) { | |
f55ab26a | 454 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
455 | gfs2_trans_end(sdp); |
456 | return error; | |
457 | } | |
458 | ||
459 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
460 | ||
461 | if (ir.ir_length) { | |
462 | *formal_ino = ir.ir_start++; | |
463 | ir.ir_length--; | |
d4e9c4c3 | 464 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
465 | gfs2_inum_range_out(&ir, |
466 | bh->b_data + sizeof(struct gfs2_dinode)); | |
467 | brelse(bh); | |
f55ab26a | 468 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
469 | gfs2_trans_end(sdp); |
470 | return 0; | |
471 | } | |
472 | ||
473 | brelse(bh); | |
474 | ||
f55ab26a | 475 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
476 | gfs2_trans_end(sdp); |
477 | ||
478 | return 1; | |
479 | } | |
480 | ||
481 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
482 | { | |
feaa7bba SW |
483 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
484 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
485 | struct gfs2_holder gh; |
486 | struct buffer_head *bh; | |
487 | struct gfs2_inum_range ir; | |
488 | int error; | |
489 | ||
490 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
491 | if (error) | |
492 | return error; | |
493 | ||
494 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
495 | if (error) | |
496 | goto out; | |
f55ab26a | 497 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
498 | |
499 | error = gfs2_meta_inode_buffer(ip, &bh); | |
500 | if (error) | |
501 | goto out_end_trans; | |
502 | ||
503 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
504 | ||
505 | if (!ir.ir_length) { | |
506 | struct buffer_head *m_bh; | |
507 | uint64_t x, y; | |
508 | ||
509 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
510 | if (error) | |
511 | goto out_brelse; | |
512 | ||
513 | x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); | |
514 | x = y = be64_to_cpu(x); | |
515 | ir.ir_start = x; | |
516 | ir.ir_length = GFS2_INUM_QUANTUM; | |
517 | x += GFS2_INUM_QUANTUM; | |
518 | if (x < y) | |
519 | gfs2_consist_inode(m_ip); | |
520 | x = cpu_to_be64(x); | |
d4e9c4c3 | 521 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
522 | *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
523 | ||
524 | brelse(m_bh); | |
525 | } | |
526 | ||
527 | *formal_ino = ir.ir_start++; | |
528 | ir.ir_length--; | |
529 | ||
d4e9c4c3 | 530 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
531 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
532 | ||
533 | out_brelse: | |
534 | brelse(bh); | |
535 | ||
536 | out_end_trans: | |
f55ab26a | 537 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
538 | gfs2_trans_end(sdp); |
539 | ||
540 | out: | |
541 | gfs2_glock_dq_uninit(&gh); | |
542 | ||
543 | return error; | |
544 | } | |
545 | ||
546 | static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) | |
547 | { | |
548 | int error; | |
549 | ||
550 | error = pick_formal_ino_1(sdp, inum); | |
551 | if (error <= 0) | |
552 | return error; | |
553 | ||
554 | error = pick_formal_ino_2(sdp, inum); | |
555 | ||
556 | return error; | |
557 | } | |
558 | ||
559 | /** | |
560 | * create_ok - OK to create a new on-disk inode here? | |
561 | * @dip: Directory in which dinode is to be created | |
562 | * @name: Name of new dinode | |
563 | * @mode: | |
564 | * | |
565 | * Returns: errno | |
566 | */ | |
567 | ||
feaa7bba | 568 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
569 | unsigned int mode) |
570 | { | |
571 | int error; | |
572 | ||
faf450ef | 573 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
574 | if (error) |
575 | return error; | |
576 | ||
577 | /* Don't create entries in an unlinked directory */ | |
578 | if (!dip->i_di.di_nlink) | |
579 | return -EPERM; | |
580 | ||
feaa7bba | 581 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
582 | switch (error) { |
583 | case -ENOENT: | |
584 | error = 0; | |
585 | break; | |
586 | case 0: | |
587 | return -EEXIST; | |
588 | default: | |
589 | return error; | |
590 | } | |
591 | ||
592 | if (dip->i_di.di_entries == (uint32_t)-1) | |
593 | return -EFBIG; | |
594 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) | |
595 | return -EMLINK; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
601 | unsigned int *uid, unsigned int *gid) | |
602 | { | |
feaa7bba | 603 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
b3b94faa DT |
604 | (dip->i_di.di_mode & S_ISUID) && |
605 | dip->i_di.di_uid) { | |
606 | if (S_ISDIR(*mode)) | |
607 | *mode |= S_ISUID; | |
608 | else if (dip->i_di.di_uid != current->fsuid) | |
609 | *mode &= ~07111; | |
610 | *uid = dip->i_di.di_uid; | |
611 | } else | |
612 | *uid = current->fsuid; | |
613 | ||
614 | if (dip->i_di.di_mode & S_ISGID) { | |
615 | if (S_ISDIR(*mode)) | |
616 | *mode |= S_ISGID; | |
617 | *gid = dip->i_di.di_gid; | |
618 | } else | |
619 | *gid = current->fsgid; | |
620 | } | |
621 | ||
feaa7bba | 622 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum) |
b3b94faa | 623 | { |
feaa7bba | 624 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
625 | int error; |
626 | ||
627 | gfs2_alloc_get(dip); | |
628 | ||
629 | dip->i_alloc.al_requested = RES_DINODE; | |
630 | error = gfs2_inplace_reserve(dip); | |
631 | if (error) | |
632 | goto out; | |
633 | ||
feaa7bba | 634 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
635 | if (error) |
636 | goto out_ipreserv; | |
637 | ||
feaa7bba | 638 | inum->no_addr = gfs2_alloc_di(dip); |
b3b94faa DT |
639 | |
640 | gfs2_trans_end(sdp); | |
641 | ||
642 | out_ipreserv: | |
643 | gfs2_inplace_release(dip); | |
644 | ||
645 | out: | |
646 | gfs2_alloc_put(dip); | |
647 | ||
648 | return error; | |
649 | } | |
650 | ||
651 | /** | |
652 | * init_dinode - Fill in a new dinode structure | |
653 | * @dip: the directory this inode is being created in | |
654 | * @gl: The glock covering the new inode | |
655 | * @inum: the inode number | |
656 | * @mode: the file permissions | |
657 | * @uid: | |
658 | * @gid: | |
659 | * | |
660 | */ | |
661 | ||
662 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
663 | struct gfs2_inum *inum, unsigned int mode, | |
664 | unsigned int uid, unsigned int gid) | |
665 | { | |
feaa7bba | 666 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 667 | struct gfs2_dinode *di; |
b3b94faa DT |
668 | struct buffer_head *dibh; |
669 | ||
670 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 671 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
672 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
673 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
674 | di = (struct gfs2_dinode *)dibh->b_data; |
675 | ||
2442a098 SW |
676 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
677 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
678 | di->di_mode = cpu_to_be32(mode); |
679 | di->di_uid = cpu_to_be32(uid); | |
680 | di->di_gid = cpu_to_be32(gid); | |
681 | di->di_nlink = cpu_to_be32(0); | |
682 | di->di_size = cpu_to_be64(0); | |
683 | di->di_blocks = cpu_to_be64(1); | |
684 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
685 | di->di_major = di->di_minor = cpu_to_be32(0); | |
686 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
687 | di->__pad[0] = di->__pad[1] = 0; | |
688 | di->di_flags = cpu_to_be32(0); | |
b3b94faa DT |
689 | |
690 | if (S_ISREG(mode)) { | |
691 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
692 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 693 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
694 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
695 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 696 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 697 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
698 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
699 | GFS2_DIF_INHERIT_DIRECTIO); | |
700 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
701 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
702 | } |
703 | ||
b96ca4fa SW |
704 | di->__pad1 = 0; |
705 | di->di_height = cpu_to_be32(0); | |
706 | di->__pad2 = 0; | |
707 | di->__pad3 = 0; | |
708 | di->di_depth = cpu_to_be16(0); | |
709 | di->di_entries = cpu_to_be32(0); | |
710 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
711 | di->di_eattr = cpu_to_be64(0); | |
712 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
713 | ||
b3b94faa DT |
714 | brelse(dibh); |
715 | } | |
716 | ||
717 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
feaa7bba | 718 | unsigned int mode, struct gfs2_inum *inum) |
b3b94faa | 719 | { |
feaa7bba | 720 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
721 | unsigned int uid, gid; |
722 | int error; | |
723 | ||
724 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
725 | gfs2_alloc_get(dip); |
726 | ||
727 | error = gfs2_quota_lock(dip, uid, gid); | |
728 | if (error) | |
729 | goto out; | |
730 | ||
731 | error = gfs2_quota_check(dip, uid, gid); | |
732 | if (error) | |
733 | goto out_quota; | |
734 | ||
feaa7bba | 735 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
736 | if (error) |
737 | goto out_quota; | |
738 | ||
feaa7bba | 739 | init_dinode(dip, gl, inum, mode, uid, gid); |
b3b94faa | 740 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
741 | gfs2_trans_end(sdp); |
742 | ||
feaa7bba | 743 | out_quota: |
b3b94faa | 744 | gfs2_quota_unlock(dip); |
feaa7bba | 745 | out: |
b3b94faa | 746 | gfs2_alloc_put(dip); |
b3b94faa DT |
747 | return error; |
748 | } | |
749 | ||
feaa7bba SW |
750 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
751 | struct gfs2_inode *ip) | |
b3b94faa | 752 | { |
feaa7bba | 753 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
754 | struct gfs2_alloc *al; |
755 | int alloc_required; | |
756 | struct buffer_head *dibh; | |
757 | int error; | |
758 | ||
759 | al = gfs2_alloc_get(dip); | |
760 | ||
761 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
762 | if (error) | |
763 | goto fail; | |
764 | ||
feaa7bba | 765 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
766 | if (alloc_required < 0) |
767 | goto fail; | |
b3b94faa DT |
768 | if (alloc_required) { |
769 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
770 | dip->i_di.di_gid); | |
771 | if (error) | |
772 | goto fail_quota_locks; | |
773 | ||
774 | al->al_requested = sdp->sd_max_dirres; | |
775 | ||
776 | error = gfs2_inplace_reserve(dip); | |
777 | if (error) | |
778 | goto fail_quota_locks; | |
779 | ||
320dd101 | 780 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 781 | al->al_rgd->rd_ri.ri_length + |
feaa7bba | 782 | 2 * RES_DINODE + |
b3b94faa DT |
783 | RES_STATFS + RES_QUOTA, 0); |
784 | if (error) | |
785 | goto fail_ipreserv; | |
786 | } else { | |
feaa7bba | 787 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
788 | if (error) |
789 | goto fail_quota_locks; | |
790 | } | |
791 | ||
feaa7bba | 792 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
793 | if (error) |
794 | goto fail_end_trans; | |
795 | ||
796 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
797 | if (error) | |
798 | goto fail_end_trans; | |
799 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 800 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
801 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
802 | brelse(dibh); | |
b3b94faa DT |
803 | return 0; |
804 | ||
320dd101 | 805 | fail_end_trans: |
b3b94faa DT |
806 | gfs2_trans_end(sdp); |
807 | ||
320dd101 | 808 | fail_ipreserv: |
b3b94faa DT |
809 | if (dip->i_alloc.al_rgd) |
810 | gfs2_inplace_release(dip); | |
811 | ||
320dd101 | 812 | fail_quota_locks: |
b3b94faa DT |
813 | gfs2_quota_unlock(dip); |
814 | ||
320dd101 | 815 | fail: |
b3b94faa | 816 | gfs2_alloc_put(dip); |
b3b94faa DT |
817 | return error; |
818 | } | |
819 | ||
820 | /** | |
821 | * gfs2_createi - Create a new inode | |
822 | * @ghs: An array of two holders | |
823 | * @name: The name of the new file | |
824 | * @mode: the permissions on the new inode | |
825 | * | |
826 | * @ghs[0] is an initialized holder for the directory | |
827 | * @ghs[1] is the holder for the inode lock | |
828 | * | |
7359a19c | 829 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
830 | * file are held. A transaction has been started and an inplace reservation |
831 | * is held, as well. | |
832 | * | |
7359a19c | 833 | * Returns: An inode |
b3b94faa DT |
834 | */ |
835 | ||
feaa7bba | 836 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
568f4c96 | 837 | unsigned int mode) |
b3b94faa | 838 | { |
7359a19c | 839 | struct inode *inode; |
5c676f6d | 840 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
841 | struct inode *dir = &dip->i_inode; |
842 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
843 | struct gfs2_inum inum; | |
b3b94faa DT |
844 | int error; |
845 | ||
846 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 847 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 848 | |
b3b94faa DT |
849 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
850 | error = gfs2_glock_nq(ghs); | |
851 | if (error) | |
852 | goto fail; | |
853 | ||
854 | error = create_ok(dip, name, mode); | |
855 | if (error) | |
856 | goto fail_gunlock; | |
857 | ||
feaa7bba | 858 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
859 | if (error) |
860 | goto fail_gunlock; | |
861 | ||
feaa7bba | 862 | error = alloc_dinode(dip, &inum); |
b3b94faa DT |
863 | if (error) |
864 | goto fail_gunlock; | |
865 | ||
feaa7bba | 866 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
867 | gfs2_glock_dq(ghs); |
868 | ||
feaa7bba | 869 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
870 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
871 | GL_SKIP, ghs + 1); | |
b3b94faa | 872 | if (error) { |
7359a19c | 873 | return ERR_PTR(error); |
b3b94faa DT |
874 | } |
875 | ||
876 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
877 | error = gfs2_glock_nq(ghs); | |
878 | if (error) { | |
879 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 880 | return ERR_PTR(error); |
b3b94faa DT |
881 | } |
882 | ||
883 | error = create_ok(dip, name, mode); | |
884 | if (error) | |
885 | goto fail_gunlock2; | |
886 | } else { | |
feaa7bba | 887 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
888 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
889 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
890 | if (error) |
891 | goto fail_gunlock; | |
892 | } | |
893 | ||
feaa7bba | 894 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum); |
b3b94faa DT |
895 | if (error) |
896 | goto fail_gunlock2; | |
897 | ||
feaa7bba SW |
898 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
899 | if (IS_ERR(inode)) | |
b3b94faa DT |
900 | goto fail_gunlock2; |
901 | ||
feaa7bba | 902 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
903 | if (error) |
904 | goto fail_iput; | |
905 | ||
feaa7bba | 906 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
907 | if (error) |
908 | goto fail_iput; | |
909 | ||
feaa7bba | 910 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
911 | if (error) |
912 | goto fail_iput; | |
913 | ||
7359a19c SW |
914 | if (!inode) |
915 | return ERR_PTR(-ENOMEM); | |
916 | return inode; | |
b3b94faa | 917 | |
320dd101 | 918 | fail_iput: |
feaa7bba | 919 | iput(inode); |
320dd101 | 920 | fail_gunlock2: |
b3b94faa | 921 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 922 | fail_gunlock: |
b3b94faa | 923 | gfs2_glock_dq(ghs); |
320dd101 | 924 | fail: |
7359a19c | 925 | return ERR_PTR(error); |
b3b94faa DT |
926 | } |
927 | ||
b3b94faa DT |
928 | /** |
929 | * gfs2_rmdiri - Remove a directory | |
930 | * @dip: The parent directory of the directory to be removed | |
931 | * @name: The name of the directory to be removed | |
932 | * @ip: The GFS2 inode of the directory to be removed | |
933 | * | |
934 | * Assumes Glocks on dip and ip are held | |
935 | * | |
936 | * Returns: errno | |
937 | */ | |
938 | ||
feaa7bba SW |
939 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
940 | struct gfs2_inode *ip) | |
b3b94faa | 941 | { |
b3b94faa DT |
942 | struct qstr dotname; |
943 | int error; | |
944 | ||
945 | if (ip->i_di.di_entries != 2) { | |
946 | if (gfs2_consist_inode(ip)) | |
947 | gfs2_dinode_print(&ip->i_di); | |
948 | return -EIO; | |
949 | } | |
950 | ||
951 | error = gfs2_dir_del(dip, name); | |
952 | if (error) | |
953 | return error; | |
954 | ||
955 | error = gfs2_change_nlink(dip, -1); | |
956 | if (error) | |
957 | return error; | |
958 | ||
71b86f56 | 959 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
960 | error = gfs2_dir_del(ip, &dotname); |
961 | if (error) | |
962 | return error; | |
963 | ||
feaa7bba | 964 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
965 | error = gfs2_dir_del(ip, &dotname); |
966 | if (error) | |
967 | return error; | |
968 | ||
969 | error = gfs2_change_nlink(ip, -2); | |
970 | if (error) | |
971 | return error; | |
972 | ||
b3b94faa DT |
973 | return error; |
974 | } | |
975 | ||
976 | /* | |
977 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
978 | * @dip: the directory | |
979 | * @name: the name of the file | |
980 | * @ip: the inode | |
981 | * | |
982 | * Assumes that the lock on (at least) @dip is held. | |
983 | * | |
984 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
985 | */ | |
986 | ||
feaa7bba | 987 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
988 | struct gfs2_inode *ip) |
989 | { | |
990 | struct gfs2_inum inum; | |
991 | unsigned int type; | |
992 | int error; | |
993 | ||
feaa7bba | 994 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
995 | return -EPERM; |
996 | ||
997 | if ((dip->i_di.di_mode & S_ISVTX) && | |
998 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 999 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
1000 | return -EPERM; |
1001 | ||
feaa7bba | 1002 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1003 | return -EPERM; |
1004 | ||
faf450ef | 1005 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1006 | if (error) |
1007 | return error; | |
1008 | ||
feaa7bba | 1009 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1010 | if (error) |
1011 | return error; | |
1012 | ||
1013 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1014 | return -ENOENT; | |
1015 | ||
1016 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1017 | gfs2_consist_inode(dip); | |
1018 | return -EIO; | |
1019 | } | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1026 | * @this: move this | |
1027 | * @to: to here | |
1028 | * | |
1029 | * Follow @to back to the root and make sure we don't encounter @this | |
1030 | * Assumes we already hold the rename lock. | |
1031 | * | |
1032 | * Returns: errno | |
1033 | */ | |
1034 | ||
1035 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1036 | { | |
feaa7bba | 1037 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1038 | struct super_block *sb = dir->i_sb; |
7359a19c | 1039 | struct inode *tmp; |
b3b94faa DT |
1040 | struct qstr dotdot; |
1041 | int error = 0; | |
1042 | ||
71b86f56 | 1043 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1044 | |
7359a19c | 1045 | igrab(dir); |
b3b94faa DT |
1046 | |
1047 | for (;;) { | |
feaa7bba | 1048 | if (dir == &this->i_inode) { |
b3b94faa DT |
1049 | error = -EINVAL; |
1050 | break; | |
1051 | } | |
c9fd4307 | 1052 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1053 | error = 0; |
1054 | break; | |
1055 | } | |
1056 | ||
c752666c SW |
1057 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1058 | if (IS_ERR(tmp)) { | |
1059 | error = PTR_ERR(tmp); | |
b3b94faa | 1060 | break; |
c752666c | 1061 | } |
b3b94faa | 1062 | |
7359a19c SW |
1063 | iput(dir); |
1064 | dir = tmp; | |
b3b94faa DT |
1065 | } |
1066 | ||
7359a19c | 1067 | iput(dir); |
b3b94faa DT |
1068 | |
1069 | return error; | |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * gfs2_readlinki - return the contents of a symlink | |
1074 | * @ip: the symlink's inode | |
1075 | * @buf: a pointer to the buffer to be filled | |
1076 | * @len: a pointer to the length of @buf | |
1077 | * | |
1078 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1079 | * to be freed by the caller. | |
1080 | * | |
1081 | * Returns: errno | |
1082 | */ | |
1083 | ||
1084 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1085 | { | |
1086 | struct gfs2_holder i_gh; | |
1087 | struct buffer_head *dibh; | |
1088 | unsigned int x; | |
1089 | int error; | |
1090 | ||
1091 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1092 | error = gfs2_glock_nq_atime(&i_gh); | |
1093 | if (error) { | |
1094 | gfs2_holder_uninit(&i_gh); | |
1095 | return error; | |
1096 | } | |
1097 | ||
1098 | if (!ip->i_di.di_size) { | |
1099 | gfs2_consist_inode(ip); | |
1100 | error = -EIO; | |
1101 | goto out; | |
1102 | } | |
1103 | ||
1104 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1105 | if (error) | |
1106 | goto out; | |
1107 | ||
1108 | x = ip->i_di.di_size + 1; | |
1109 | if (x > *len) { | |
1110 | *buf = kmalloc(x, GFP_KERNEL); | |
1111 | if (!*buf) { | |
1112 | error = -ENOMEM; | |
1113 | goto out_brelse; | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1118 | *len = x; | |
1119 | ||
feaa7bba | 1120 | out_brelse: |
b3b94faa | 1121 | brelse(dibh); |
feaa7bba | 1122 | out: |
b3b94faa | 1123 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1124 | return error; |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1129 | * conditionally update the inode's atime | |
1130 | * @gh: the holder to acquire | |
1131 | * | |
1132 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1133 | * Update if the difference between the current time and the inode's current | |
1134 | * atime is greater than an interval specified at mount. | |
1135 | * | |
1136 | * Returns: errno | |
1137 | */ | |
1138 | ||
1139 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1140 | { | |
1141 | struct gfs2_glock *gl = gh->gh_gl; | |
1142 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1143 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
1144 | int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
1145 | unsigned int state; | |
1146 | int flags; | |
1147 | int error; | |
1148 | ||
1149 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1150 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1151 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | state = gh->gh_state; | |
1155 | flags = gh->gh_flags; | |
1156 | ||
1157 | error = gfs2_glock_nq(gh); | |
1158 | if (error) | |
1159 | return error; | |
1160 | ||
1161 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1162 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1163 | return 0; | |
1164 | ||
1165 | curtime = get_seconds(); | |
1166 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1167 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1168 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1169 | gh); | |
b3b94faa DT |
1170 | error = gfs2_glock_nq(gh); |
1171 | if (error) | |
1172 | return error; | |
1173 | ||
1174 | /* Verify that atime hasn't been updated while we were | |
1175 | trying to get exclusive lock. */ | |
1176 | ||
1177 | curtime = get_seconds(); | |
1178 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1179 | struct buffer_head *dibh; | |
1180 | ||
1181 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1182 | if (error == -EROFS) | |
1183 | return 0; | |
1184 | if (error) | |
1185 | goto fail; | |
1186 | ||
1187 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1188 | if (error) | |
1189 | goto fail_end_trans; | |
1190 | ||
1191 | ip->i_di.di_atime = curtime; | |
1192 | ||
d4e9c4c3 | 1193 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1194 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1195 | brelse(dibh); | |
1196 | ||
1197 | gfs2_trans_end(sdp); | |
1198 | } | |
1199 | ||
1200 | /* If someone else has asked for the glock, | |
1201 | unlock and let them have it. Then reacquire | |
1202 | in the original state. */ | |
1203 | if (gfs2_glock_is_blocking(gl)) { | |
1204 | gfs2_glock_dq(gh); | |
1205 | gfs2_holder_reinit(state, flags, gh); | |
1206 | return gfs2_glock_nq(gh); | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | return 0; | |
1211 | ||
feaa7bba | 1212 | fail_end_trans: |
b3b94faa | 1213 | gfs2_trans_end(sdp); |
feaa7bba | 1214 | fail: |
b3b94faa | 1215 | gfs2_glock_dq(gh); |
b3b94faa DT |
1216 | return error; |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1221 | * @arg_a: the first structure | |
1222 | * @arg_b: the second structure | |
1223 | * | |
1224 | * Returns: 1 if A > B | |
1225 | * -1 if A < B | |
1226 | * 0 if A = B | |
1227 | */ | |
1228 | ||
1229 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1230 | { | |
1231 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1232 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1233 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1234 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1235 | int ret = 0; | |
1236 | ||
1237 | if (a->ln_number > b->ln_number) | |
1238 | ret = 1; | |
1239 | else if (a->ln_number < b->ln_number) | |
1240 | ret = -1; | |
1241 | else { | |
1242 | if (gh_a->gh_state == LM_ST_SHARED && | |
1243 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1244 | ret = 1; | |
1245 | else if (gh_a->gh_state == LM_ST_SHARED && | |
1246 | (gh_b->gh_flags & GL_ATIME)) | |
1247 | ret = 1; | |
1248 | } | |
1249 | ||
1250 | return ret; | |
1251 | } | |
1252 | ||
1253 | /** | |
1254 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1255 | * atime update | |
1256 | * @num_gh: the number of structures | |
1257 | * @ghs: an array of struct gfs2_holder structures | |
1258 | * | |
1259 | * Returns: 0 on success (all glocks acquired), | |
1260 | * errno on failure (no glocks acquired) | |
1261 | */ | |
1262 | ||
1263 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1264 | { | |
1265 | struct gfs2_holder **p; | |
1266 | unsigned int x; | |
1267 | int error = 0; | |
1268 | ||
1269 | if (!num_gh) | |
1270 | return 0; | |
1271 | ||
1272 | if (num_gh == 1) { | |
1273 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1274 | if (ghs->gh_flags & GL_ATIME) | |
1275 | error = gfs2_glock_nq_atime(ghs); | |
1276 | else | |
1277 | error = gfs2_glock_nq(ghs); | |
1278 | return error; | |
1279 | } | |
1280 | ||
1281 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1282 | if (!p) | |
1283 | return -ENOMEM; | |
1284 | ||
1285 | for (x = 0; x < num_gh; x++) | |
1286 | p[x] = &ghs[x]; | |
1287 | ||
1288 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1289 | ||
1290 | for (x = 0; x < num_gh; x++) { | |
1291 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1292 | ||
1293 | if (p[x]->gh_flags & GL_ATIME) | |
1294 | error = gfs2_glock_nq_atime(p[x]); | |
1295 | else | |
1296 | error = gfs2_glock_nq(p[x]); | |
1297 | ||
1298 | if (error) { | |
1299 | while (x--) | |
1300 | gfs2_glock_dq(p[x]); | |
1301 | break; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | kfree(p); | |
1306 | ||
1307 | return error; | |
1308 | } | |
1309 | ||
b3b94faa DT |
1310 | |
1311 | static int | |
1312 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1313 | { | |
1314 | struct buffer_head *dibh; | |
1315 | int error; | |
1316 | ||
1317 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1318 | if (!error) { | |
feaa7bba SW |
1319 | error = inode_setattr(&ip->i_inode, attr); |
1320 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1321 | gfs2_inode_attr_out(ip); |
1322 | ||
d4e9c4c3 | 1323 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1324 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1325 | brelse(dibh); | |
1326 | } | |
1327 | return error; | |
1328 | } | |
1329 | ||
1330 | /** | |
1331 | * gfs2_setattr_simple - | |
1332 | * @ip: | |
1333 | * @attr: | |
1334 | * | |
1335 | * Called with a reference on the vnode. | |
1336 | * | |
1337 | * Returns: errno | |
1338 | */ | |
1339 | ||
1340 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1341 | { | |
1342 | int error; | |
1343 | ||
5c676f6d | 1344 | if (current->journal_info) |
b3b94faa DT |
1345 | return __gfs2_setattr_simple(ip, attr); |
1346 | ||
feaa7bba | 1347 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1348 | if (error) |
1349 | return error; | |
1350 | ||
1351 | error = __gfs2_setattr_simple(ip, attr); | |
1352 | ||
feaa7bba | 1353 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1354 | |
1355 | return error; | |
1356 | } | |
1357 |