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 | /** | |
4340fe62 | 41 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode |
b3b94faa DT |
42 | * @ip: The GFS2 inode (with embedded disk inode data) |
43 | * @inode: The Linux VFS inode | |
44 | * | |
45 | */ | |
46 | ||
4340fe62 | 47 | void gfs2_inode_attr_in(struct gfs2_inode *ip) |
b3b94faa | 48 | { |
4340fe62 SW |
49 | struct inode *inode = &ip->i_inode; |
50 | ||
51 | inode->i_ino = ip->i_num.no_addr; | |
b3b94faa DT |
52 | |
53 | switch (ip->i_di.di_mode & S_IFMT) { | |
54 | case S_IFBLK: | |
55 | case S_IFCHR: | |
56 | inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); | |
57 | break; | |
58 | default: | |
59 | inode->i_rdev = 0; | |
60 | break; | |
61 | }; | |
62 | ||
63 | inode->i_mode = ip->i_di.di_mode; | |
64 | inode->i_nlink = ip->i_di.di_nlink; | |
65 | inode->i_uid = ip->i_di.di_uid; | |
66 | inode->i_gid = ip->i_di.di_gid; | |
67 | i_size_write(inode, ip->i_di.di_size); | |
68 | inode->i_atime.tv_sec = ip->i_di.di_atime; | |
69 | inode->i_mtime.tv_sec = ip->i_di.di_mtime; | |
70 | inode->i_ctime.tv_sec = ip->i_di.di_ctime; | |
71 | inode->i_atime.tv_nsec = 0; | |
72 | inode->i_mtime.tv_nsec = 0; | |
73 | inode->i_ctime.tv_nsec = 0; | |
74 | inode->i_blksize = PAGE_SIZE; | |
75 | inode->i_blocks = ip->i_di.di_blocks << | |
feaa7bba | 76 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa DT |
77 | |
78 | if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) | |
79 | inode->i_flags |= S_IMMUTABLE; | |
80 | else | |
81 | inode->i_flags &= ~S_IMMUTABLE; | |
82 | ||
83 | if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) | |
84 | inode->i_flags |= S_APPEND; | |
85 | else | |
86 | inode->i_flags &= ~S_APPEND; | |
87 | } | |
88 | ||
b3b94faa DT |
89 | /** |
90 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
91 | * @ip: The GFS2 inode | |
92 | * | |
93 | * Only copy out the attributes that we want the VFS layer | |
94 | * to be able to modify. | |
95 | */ | |
96 | ||
97 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
98 | { | |
feaa7bba | 99 | struct inode *inode = &ip->i_inode; |
b3b94faa | 100 | |
feaa7bba | 101 | gfs2_assert_withdraw(GFS2_SB(inode), |
b3b94faa DT |
102 | (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
103 | ip->i_di.di_mode = inode->i_mode; | |
104 | ip->i_di.di_uid = inode->i_uid; | |
105 | ip->i_di.di_gid = inode->i_gid; | |
106 | ip->i_di.di_atime = inode->i_atime.tv_sec; | |
107 | ip->i_di.di_mtime = inode->i_mtime.tv_sec; | |
108 | ip->i_di.di_ctime = inode->i_ctime.tv_sec; | |
109 | } | |
110 | ||
feaa7bba SW |
111 | static int iget_test(struct inode *inode, void *opaque) |
112 | { | |
113 | struct gfs2_inode *ip = GFS2_I(inode); | |
114 | struct gfs2_inum *inum = opaque; | |
115 | ||
116 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
117 | return 1; | |
b3b94faa | 118 | |
feaa7bba SW |
119 | return 0; |
120 | } | |
121 | ||
122 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 123 | { |
feaa7bba SW |
124 | struct gfs2_inode *ip = GFS2_I(inode); |
125 | struct gfs2_inum *inum = opaque; | |
b3b94faa | 126 | |
feaa7bba SW |
127 | ip->i_num = *inum; |
128 | return 0; | |
129 | } | |
b3b94faa | 130 | |
feaa7bba SW |
131 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum) |
132 | { | |
133 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
134 | iget_test, inum); | |
135 | } | |
b3b94faa | 136 | |
feaa7bba SW |
137 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) |
138 | { | |
139 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
140 | iget_test, iget_set, inum); | |
b3b94faa DT |
141 | } |
142 | ||
143 | /** | |
feaa7bba SW |
144 | * gfs2_inode_lookup - Lookup an inode |
145 | * @sb: The super block | |
146 | * @inum: The inode number | |
147 | * @type: The type of the inode | |
b3b94faa | 148 | * |
feaa7bba | 149 | * Returns: A VFS inode, or an error |
b3b94faa DT |
150 | */ |
151 | ||
feaa7bba | 152 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type) |
b3b94faa | 153 | { |
feaa7bba SW |
154 | struct inode *inode = gfs2_iget(sb, inum); |
155 | struct gfs2_inode *ip = GFS2_I(inode); | |
156 | struct gfs2_glock *io_gl; | |
157 | int error; | |
b3b94faa | 158 | |
feaa7bba SW |
159 | if (inode->i_state & I_NEW) { |
160 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
161 | umode_t mode = DT2IF(type); | |
162 | inode->u.generic_ip = ip; | |
163 | inode->i_mode = mode; | |
164 | ||
165 | if (S_ISREG(mode)) { | |
166 | inode->i_op = &gfs2_file_iops; | |
167 | inode->i_fop = &gfs2_file_fops; | |
168 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
169 | } else if (S_ISDIR(mode)) { | |
170 | inode->i_op = &gfs2_dir_iops; | |
171 | inode->i_fop = &gfs2_dir_fops; | |
172 | } else if (S_ISLNK(mode)) { | |
173 | inode->i_op = &gfs2_symlink_iops; | |
174 | } else { | |
175 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 176 | } |
b3b94faa | 177 | |
feaa7bba SW |
178 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
179 | if (unlikely(error)) | |
180 | goto fail; | |
181 | ip->i_gl->gl_object = ip; | |
b3b94faa | 182 | |
feaa7bba SW |
183 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
184 | if (unlikely(error)) | |
185 | goto fail_put; | |
b3b94faa | 186 | |
feaa7bba SW |
187 | ip->i_vn = ip->i_gl->gl_vn - 1; |
188 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
189 | if (unlikely(error)) | |
190 | goto fail_iopen; | |
b3b94faa | 191 | |
feaa7bba SW |
192 | gfs2_glock_put(io_gl); |
193 | unlock_new_inode(inode); | |
194 | } | |
b3b94faa DT |
195 | |
196 | return inode; | |
feaa7bba SW |
197 | fail_iopen: |
198 | gfs2_glock_put(io_gl); | |
199 | fail_put: | |
200 | ip->i_gl->gl_object = NULL; | |
201 | gfs2_glock_put(ip->i_gl); | |
202 | fail: | |
203 | iput(inode); | |
204 | return ERR_PTR(error); | |
b3b94faa DT |
205 | } |
206 | ||
207 | /** | |
208 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
209 | * @ip: The GFS2 inode | |
210 | * | |
211 | * Returns: errno | |
212 | */ | |
213 | ||
214 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
215 | { | |
216 | struct buffer_head *dibh; | |
217 | int error; | |
218 | ||
219 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
220 | if (error) | |
221 | return error; | |
222 | ||
feaa7bba | 223 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
224 | brelse(dibh); |
225 | return -EIO; | |
226 | } | |
227 | ||
b3b94faa | 228 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
b3b94faa DT |
229 | |
230 | brelse(dibh); | |
231 | ||
232 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
233 | if (gfs2_consist_inode(ip)) | |
234 | gfs2_dinode_print(&ip->i_di); | |
235 | return -EIO; | |
236 | } | |
237 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
238 | return -ESTALE; | |
239 | ||
240 | ip->i_vn = ip->i_gl->gl_vn; | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
feaa7bba | 245 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 246 | { |
feaa7bba | 247 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
248 | struct gfs2_alloc *al; |
249 | struct gfs2_rgrpd *rgd; | |
250 | int error; | |
251 | ||
252 | if (ip->i_di.di_blocks != 1) { | |
253 | if (gfs2_consist_inode(ip)) | |
254 | gfs2_dinode_print(&ip->i_di); | |
255 | return -EIO; | |
256 | } | |
257 | ||
258 | al = gfs2_alloc_get(ip); | |
259 | ||
260 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
261 | if (error) | |
262 | goto out; | |
263 | ||
264 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
265 | if (error) | |
266 | goto out_qs; | |
267 | ||
268 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
269 | if (!rgd) { | |
270 | gfs2_consist_inode(ip); | |
271 | error = -EIO; | |
272 | goto out_rindex_relse; | |
273 | } | |
274 | ||
275 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
276 | &al->al_rgd_gh); | |
277 | if (error) | |
278 | goto out_rindex_relse; | |
279 | ||
feaa7bba | 280 | error = gfs2_trans_begin(sdp, RES_RG_BIT + |
b3b94faa DT |
281 | RES_STATFS + RES_QUOTA, 1); |
282 | if (error) | |
283 | goto out_rg_gunlock; | |
284 | ||
285 | gfs2_trans_add_gl(ip->i_gl); | |
286 | ||
287 | gfs2_free_di(rgd, ip); | |
288 | ||
b3b94faa DT |
289 | gfs2_trans_end(sdp); |
290 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
291 | ||
feaa7bba | 292 | out_rg_gunlock: |
b3b94faa | 293 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 294 | out_rindex_relse: |
b3b94faa | 295 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 296 | out_qs: |
b3b94faa | 297 | gfs2_quota_unhold(ip); |
36327521 | 298 | out: |
feaa7bba | 299 | gfs2_alloc_put(ip); |
b3b94faa DT |
300 | return error; |
301 | } | |
302 | ||
b3b94faa DT |
303 | /** |
304 | * gfs2_change_nlink - Change nlink count on inode | |
305 | * @ip: The GFS2 inode | |
306 | * @diff: The change in the nlink count required | |
307 | * | |
308 | * Returns: errno | |
309 | */ | |
310 | ||
311 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
312 | { | |
feaa7bba | 313 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa DT |
314 | struct buffer_head *dibh; |
315 | uint32_t nlink; | |
316 | int error; | |
317 | ||
29937ac6 | 318 | BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); |
b3b94faa DT |
319 | nlink = ip->i_di.di_nlink + diff; |
320 | ||
321 | /* If we are reducing the nlink count, but the new value ends up being | |
322 | bigger than the old one, we must have underflowed. */ | |
323 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
324 | if (gfs2_consist_inode(ip)) | |
325 | gfs2_dinode_print(&ip->i_di); | |
326 | return -EIO; | |
327 | } | |
328 | ||
329 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
330 | if (error) | |
331 | return error; | |
332 | ||
333 | ip->i_di.di_nlink = nlink; | |
334 | ip->i_di.di_ctime = get_seconds(); | |
29937ac6 | 335 | ip->i_inode.i_nlink = nlink; |
b3b94faa | 336 | |
d4e9c4c3 | 337 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
338 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
339 | brelse(dibh); | |
feaa7bba | 340 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 341 | |
feaa7bba SW |
342 | if (ip->i_di.di_nlink == 0) { |
343 | struct gfs2_rgrpd *rgd; | |
344 | struct gfs2_holder ri_gh, rg_gh; | |
345 | ||
346 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
347 | if (error) | |
348 | goto out; | |
349 | error = -EIO; | |
350 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
351 | if (!rgd) | |
352 | goto out_norgrp; | |
353 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
354 | if (error) | |
355 | goto out_norgrp; | |
356 | ||
357 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
358 | gfs2_glock_dq_uninit(&rg_gh); | |
359 | out_norgrp: | |
360 | gfs2_glock_dq_uninit(&ri_gh); | |
361 | } | |
362 | out: | |
363 | return error; | |
b3b94faa DT |
364 | } |
365 | ||
c752666c SW |
366 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
367 | { | |
368 | struct qstr qstr; | |
71b86f56 | 369 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
370 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
371 | } | |
372 | ||
373 | ||
b3b94faa DT |
374 | /** |
375 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
376 | * @d_gh: An initialized holder for the directory glock | |
377 | * @name: The name of the inode to look for | |
378 | * @is_root: If 1, ignore the caller's permissions | |
379 | * @i_gh: An uninitialized holder for the new inode glock | |
380 | * | |
381 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
382 | * @is_root is true. | |
383 | * | |
384 | * Returns: errno | |
385 | */ | |
386 | ||
feaa7bba SW |
387 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
388 | int is_root, struct nameidata *nd) | |
c752666c | 389 | |
b3b94faa | 390 | { |
c9fd4307 | 391 | struct super_block *sb = dir->i_sb; |
feaa7bba | 392 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa DT |
393 | struct gfs2_holder d_gh; |
394 | struct gfs2_inum inum; | |
395 | unsigned int type; | |
7359a19c | 396 | int error = 0; |
c752666c | 397 | struct inode *inode = NULL; |
b3b94faa DT |
398 | |
399 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 400 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 401 | |
c752666c SW |
402 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
403 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
404 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
405 | igrab(dir); |
406 | return dir; | |
b3b94faa DT |
407 | } |
408 | ||
409 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
410 | if (error) | |
c752666c | 411 | return ERR_PTR(error); |
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 | ||
c752666c | 419 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
420 | if (error) |
421 | goto out; | |
422 | ||
feaa7bba | 423 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 424 | |
7359a19c | 425 | out: |
b3b94faa | 426 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
427 | if (error == -ENOENT) |
428 | return NULL; | |
feaa7bba | 429 | return inode; |
b3b94faa DT |
430 | } |
431 | ||
432 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
433 | { | |
feaa7bba | 434 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa DT |
435 | struct buffer_head *bh; |
436 | struct gfs2_inum_range ir; | |
437 | int error; | |
438 | ||
439 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
440 | if (error) | |
441 | return error; | |
f55ab26a | 442 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
443 | |
444 | error = gfs2_meta_inode_buffer(ip, &bh); | |
445 | if (error) { | |
f55ab26a | 446 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
447 | gfs2_trans_end(sdp); |
448 | return error; | |
449 | } | |
450 | ||
451 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
452 | ||
453 | if (ir.ir_length) { | |
454 | *formal_ino = ir.ir_start++; | |
455 | ir.ir_length--; | |
d4e9c4c3 | 456 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
457 | gfs2_inum_range_out(&ir, |
458 | bh->b_data + sizeof(struct gfs2_dinode)); | |
459 | brelse(bh); | |
f55ab26a | 460 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
461 | gfs2_trans_end(sdp); |
462 | return 0; | |
463 | } | |
464 | ||
465 | brelse(bh); | |
466 | ||
f55ab26a | 467 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
468 | gfs2_trans_end(sdp); |
469 | ||
470 | return 1; | |
471 | } | |
472 | ||
473 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) | |
474 | { | |
feaa7bba SW |
475 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
476 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
477 | struct gfs2_holder gh; |
478 | struct buffer_head *bh; | |
479 | struct gfs2_inum_range ir; | |
480 | int error; | |
481 | ||
482 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
483 | if (error) | |
484 | return error; | |
485 | ||
486 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
487 | if (error) | |
488 | goto out; | |
f55ab26a | 489 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
490 | |
491 | error = gfs2_meta_inode_buffer(ip, &bh); | |
492 | if (error) | |
493 | goto out_end_trans; | |
494 | ||
495 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
496 | ||
497 | if (!ir.ir_length) { | |
498 | struct buffer_head *m_bh; | |
499 | uint64_t x, y; | |
500 | ||
501 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
502 | if (error) | |
503 | goto out_brelse; | |
504 | ||
505 | x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); | |
506 | x = y = be64_to_cpu(x); | |
507 | ir.ir_start = x; | |
508 | ir.ir_length = GFS2_INUM_QUANTUM; | |
509 | x += GFS2_INUM_QUANTUM; | |
510 | if (x < y) | |
511 | gfs2_consist_inode(m_ip); | |
512 | x = cpu_to_be64(x); | |
d4e9c4c3 | 513 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
514 | *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
515 | ||
516 | brelse(m_bh); | |
517 | } | |
518 | ||
519 | *formal_ino = ir.ir_start++; | |
520 | ir.ir_length--; | |
521 | ||
d4e9c4c3 | 522 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
523 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
524 | ||
525 | out_brelse: | |
526 | brelse(bh); | |
527 | ||
528 | out_end_trans: | |
f55ab26a | 529 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
530 | gfs2_trans_end(sdp); |
531 | ||
532 | out: | |
533 | gfs2_glock_dq_uninit(&gh); | |
534 | ||
535 | return error; | |
536 | } | |
537 | ||
538 | static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) | |
539 | { | |
540 | int error; | |
541 | ||
542 | error = pick_formal_ino_1(sdp, inum); | |
543 | if (error <= 0) | |
544 | return error; | |
545 | ||
546 | error = pick_formal_ino_2(sdp, inum); | |
547 | ||
548 | return error; | |
549 | } | |
550 | ||
551 | /** | |
552 | * create_ok - OK to create a new on-disk inode here? | |
553 | * @dip: Directory in which dinode is to be created | |
554 | * @name: Name of new dinode | |
555 | * @mode: | |
556 | * | |
557 | * Returns: errno | |
558 | */ | |
559 | ||
feaa7bba | 560 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
561 | unsigned int mode) |
562 | { | |
563 | int error; | |
564 | ||
faf450ef | 565 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
566 | if (error) |
567 | return error; | |
568 | ||
569 | /* Don't create entries in an unlinked directory */ | |
570 | if (!dip->i_di.di_nlink) | |
571 | return -EPERM; | |
572 | ||
feaa7bba | 573 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
574 | switch (error) { |
575 | case -ENOENT: | |
576 | error = 0; | |
577 | break; | |
578 | case 0: | |
579 | return -EEXIST; | |
580 | default: | |
581 | return error; | |
582 | } | |
583 | ||
584 | if (dip->i_di.di_entries == (uint32_t)-1) | |
585 | return -EFBIG; | |
586 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) | |
587 | return -EMLINK; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
593 | unsigned int *uid, unsigned int *gid) | |
594 | { | |
feaa7bba | 595 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
b3b94faa DT |
596 | (dip->i_di.di_mode & S_ISUID) && |
597 | dip->i_di.di_uid) { | |
598 | if (S_ISDIR(*mode)) | |
599 | *mode |= S_ISUID; | |
600 | else if (dip->i_di.di_uid != current->fsuid) | |
601 | *mode &= ~07111; | |
602 | *uid = dip->i_di.di_uid; | |
603 | } else | |
604 | *uid = current->fsuid; | |
605 | ||
606 | if (dip->i_di.di_mode & S_ISGID) { | |
607 | if (S_ISDIR(*mode)) | |
608 | *mode |= S_ISGID; | |
609 | *gid = dip->i_di.di_gid; | |
610 | } else | |
611 | *gid = current->fsgid; | |
612 | } | |
613 | ||
4340fe62 SW |
614 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum, |
615 | u64 *generation) | |
b3b94faa | 616 | { |
feaa7bba | 617 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
618 | int error; |
619 | ||
620 | gfs2_alloc_get(dip); | |
621 | ||
622 | dip->i_alloc.al_requested = RES_DINODE; | |
623 | error = gfs2_inplace_reserve(dip); | |
624 | if (error) | |
625 | goto out; | |
626 | ||
feaa7bba | 627 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
628 | if (error) |
629 | goto out_ipreserv; | |
630 | ||
4340fe62 | 631 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
632 | |
633 | gfs2_trans_end(sdp); | |
634 | ||
4340fe62 | 635 | out_ipreserv: |
b3b94faa DT |
636 | gfs2_inplace_release(dip); |
637 | ||
4340fe62 | 638 | out: |
b3b94faa DT |
639 | gfs2_alloc_put(dip); |
640 | ||
641 | return error; | |
642 | } | |
643 | ||
644 | /** | |
645 | * init_dinode - Fill in a new dinode structure | |
646 | * @dip: the directory this inode is being created in | |
647 | * @gl: The glock covering the new inode | |
648 | * @inum: the inode number | |
649 | * @mode: the file permissions | |
650 | * @uid: | |
651 | * @gid: | |
652 | * | |
653 | */ | |
654 | ||
655 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
656 | const struct gfs2_inum *inum, unsigned int mode, |
657 | unsigned int uid, unsigned int gid, | |
658 | const u64 *generation) | |
b3b94faa | 659 | { |
feaa7bba | 660 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 661 | struct gfs2_dinode *di; |
b3b94faa DT |
662 | struct buffer_head *dibh; |
663 | ||
664 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 665 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
666 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
667 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
668 | di = (struct gfs2_dinode *)dibh->b_data; |
669 | ||
2442a098 SW |
670 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
671 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
672 | di->di_mode = cpu_to_be32(mode); |
673 | di->di_uid = cpu_to_be32(uid); | |
674 | di->di_gid = cpu_to_be32(gid); | |
675 | di->di_nlink = cpu_to_be32(0); | |
676 | di->di_size = cpu_to_be64(0); | |
677 | di->di_blocks = cpu_to_be64(1); | |
678 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
679 | di->di_major = di->di_minor = cpu_to_be32(0); | |
680 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
4340fe62 | 681 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 682 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
683 | |
684 | if (S_ISREG(mode)) { | |
685 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
686 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 687 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
688 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
689 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 690 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 691 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
692 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
693 | GFS2_DIF_INHERIT_DIRECTIO); | |
694 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
695 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
696 | } |
697 | ||
b96ca4fa | 698 | di->__pad1 = 0; |
b2a580d8 | 699 | di->di_payload_format = cpu_to_be32(0); |
b96ca4fa SW |
700 | di->di_height = cpu_to_be32(0); |
701 | di->__pad2 = 0; | |
702 | di->__pad3 = 0; | |
703 | di->di_depth = cpu_to_be16(0); | |
704 | di->di_entries = cpu_to_be32(0); | |
705 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
706 | di->di_eattr = cpu_to_be64(0); | |
707 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
708 | ||
b3b94faa DT |
709 | brelse(dibh); |
710 | } | |
711 | ||
712 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
713 | unsigned int mode, const struct gfs2_inum *inum, |
714 | const u64 *generation) | |
b3b94faa | 715 | { |
feaa7bba | 716 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
717 | unsigned int uid, gid; |
718 | int error; | |
719 | ||
720 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
721 | gfs2_alloc_get(dip); |
722 | ||
723 | error = gfs2_quota_lock(dip, uid, gid); | |
724 | if (error) | |
725 | goto out; | |
726 | ||
727 | error = gfs2_quota_check(dip, uid, gid); | |
728 | if (error) | |
729 | goto out_quota; | |
730 | ||
feaa7bba | 731 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
732 | if (error) |
733 | goto out_quota; | |
734 | ||
4340fe62 | 735 | init_dinode(dip, gl, inum, mode, uid, gid, generation); |
b3b94faa | 736 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
737 | gfs2_trans_end(sdp); |
738 | ||
feaa7bba | 739 | out_quota: |
b3b94faa | 740 | gfs2_quota_unlock(dip); |
feaa7bba | 741 | out: |
b3b94faa | 742 | gfs2_alloc_put(dip); |
b3b94faa DT |
743 | return error; |
744 | } | |
745 | ||
feaa7bba SW |
746 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
747 | struct gfs2_inode *ip) | |
b3b94faa | 748 | { |
feaa7bba | 749 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
750 | struct gfs2_alloc *al; |
751 | int alloc_required; | |
752 | struct buffer_head *dibh; | |
753 | int error; | |
754 | ||
755 | al = gfs2_alloc_get(dip); | |
756 | ||
757 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
758 | if (error) | |
759 | goto fail; | |
760 | ||
feaa7bba | 761 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
762 | if (alloc_required < 0) |
763 | goto fail; | |
b3b94faa DT |
764 | if (alloc_required) { |
765 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
766 | dip->i_di.di_gid); | |
767 | if (error) | |
768 | goto fail_quota_locks; | |
769 | ||
770 | al->al_requested = sdp->sd_max_dirres; | |
771 | ||
772 | error = gfs2_inplace_reserve(dip); | |
773 | if (error) | |
774 | goto fail_quota_locks; | |
775 | ||
320dd101 | 776 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 777 | al->al_rgd->rd_ri.ri_length + |
feaa7bba | 778 | 2 * RES_DINODE + |
b3b94faa DT |
779 | RES_STATFS + RES_QUOTA, 0); |
780 | if (error) | |
781 | goto fail_ipreserv; | |
782 | } else { | |
feaa7bba | 783 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
784 | if (error) |
785 | goto fail_quota_locks; | |
786 | } | |
787 | ||
feaa7bba | 788 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
789 | if (error) |
790 | goto fail_end_trans; | |
791 | ||
792 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
793 | if (error) | |
794 | goto fail_end_trans; | |
795 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 796 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
797 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
798 | brelse(dibh); | |
b3b94faa DT |
799 | return 0; |
800 | ||
320dd101 | 801 | fail_end_trans: |
b3b94faa DT |
802 | gfs2_trans_end(sdp); |
803 | ||
320dd101 | 804 | fail_ipreserv: |
b3b94faa DT |
805 | if (dip->i_alloc.al_rgd) |
806 | gfs2_inplace_release(dip); | |
807 | ||
320dd101 | 808 | fail_quota_locks: |
b3b94faa DT |
809 | gfs2_quota_unlock(dip); |
810 | ||
320dd101 | 811 | fail: |
b3b94faa | 812 | gfs2_alloc_put(dip); |
b3b94faa DT |
813 | return error; |
814 | } | |
815 | ||
816 | /** | |
817 | * gfs2_createi - Create a new inode | |
818 | * @ghs: An array of two holders | |
819 | * @name: The name of the new file | |
820 | * @mode: the permissions on the new inode | |
821 | * | |
822 | * @ghs[0] is an initialized holder for the directory | |
823 | * @ghs[1] is the holder for the inode lock | |
824 | * | |
7359a19c | 825 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
826 | * file are held. A transaction has been started and an inplace reservation |
827 | * is held, as well. | |
828 | * | |
7359a19c | 829 | * Returns: An inode |
b3b94faa DT |
830 | */ |
831 | ||
feaa7bba | 832 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
568f4c96 | 833 | unsigned int mode) |
b3b94faa | 834 | { |
7359a19c | 835 | struct inode *inode; |
5c676f6d | 836 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
837 | struct inode *dir = &dip->i_inode; |
838 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
839 | struct gfs2_inum inum; | |
b3b94faa | 840 | int error; |
4340fe62 | 841 | u64 generation; |
b3b94faa DT |
842 | |
843 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 844 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 845 | |
b3b94faa DT |
846 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
847 | error = gfs2_glock_nq(ghs); | |
848 | if (error) | |
849 | goto fail; | |
850 | ||
851 | error = create_ok(dip, name, mode); | |
852 | if (error) | |
853 | goto fail_gunlock; | |
854 | ||
feaa7bba | 855 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
856 | if (error) |
857 | goto fail_gunlock; | |
858 | ||
4340fe62 | 859 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
860 | if (error) |
861 | goto fail_gunlock; | |
862 | ||
feaa7bba | 863 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
864 | gfs2_glock_dq(ghs); |
865 | ||
feaa7bba | 866 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
867 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
868 | GL_SKIP, ghs + 1); | |
b3b94faa | 869 | if (error) { |
7359a19c | 870 | return ERR_PTR(error); |
b3b94faa DT |
871 | } |
872 | ||
873 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
874 | error = gfs2_glock_nq(ghs); | |
875 | if (error) { | |
876 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 877 | return ERR_PTR(error); |
b3b94faa DT |
878 | } |
879 | ||
880 | error = create_ok(dip, name, mode); | |
881 | if (error) | |
882 | goto fail_gunlock2; | |
883 | } else { | |
feaa7bba | 884 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
885 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
886 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
887 | if (error) |
888 | goto fail_gunlock; | |
889 | } | |
890 | ||
4340fe62 | 891 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); |
b3b94faa DT |
892 | if (error) |
893 | goto fail_gunlock2; | |
894 | ||
feaa7bba SW |
895 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
896 | if (IS_ERR(inode)) | |
b3b94faa DT |
897 | goto fail_gunlock2; |
898 | ||
feaa7bba | 899 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
900 | if (error) |
901 | goto fail_iput; | |
902 | ||
feaa7bba | 903 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
904 | if (error) |
905 | goto fail_iput; | |
906 | ||
feaa7bba | 907 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
908 | if (error) |
909 | goto fail_iput; | |
910 | ||
7359a19c SW |
911 | if (!inode) |
912 | return ERR_PTR(-ENOMEM); | |
913 | return inode; | |
b3b94faa | 914 | |
320dd101 | 915 | fail_iput: |
feaa7bba | 916 | iput(inode); |
320dd101 | 917 | fail_gunlock2: |
b3b94faa | 918 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 919 | fail_gunlock: |
b3b94faa | 920 | gfs2_glock_dq(ghs); |
320dd101 | 921 | fail: |
7359a19c | 922 | return ERR_PTR(error); |
b3b94faa DT |
923 | } |
924 | ||
b3b94faa DT |
925 | /** |
926 | * gfs2_rmdiri - Remove a directory | |
927 | * @dip: The parent directory of the directory to be removed | |
928 | * @name: The name of the directory to be removed | |
929 | * @ip: The GFS2 inode of the directory to be removed | |
930 | * | |
931 | * Assumes Glocks on dip and ip are held | |
932 | * | |
933 | * Returns: errno | |
934 | */ | |
935 | ||
feaa7bba SW |
936 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
937 | struct gfs2_inode *ip) | |
b3b94faa | 938 | { |
b3b94faa DT |
939 | struct qstr dotname; |
940 | int error; | |
941 | ||
942 | if (ip->i_di.di_entries != 2) { | |
943 | if (gfs2_consist_inode(ip)) | |
944 | gfs2_dinode_print(&ip->i_di); | |
945 | return -EIO; | |
946 | } | |
947 | ||
948 | error = gfs2_dir_del(dip, name); | |
949 | if (error) | |
950 | return error; | |
951 | ||
952 | error = gfs2_change_nlink(dip, -1); | |
953 | if (error) | |
954 | return error; | |
955 | ||
71b86f56 | 956 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
957 | error = gfs2_dir_del(ip, &dotname); |
958 | if (error) | |
959 | return error; | |
960 | ||
feaa7bba | 961 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
962 | error = gfs2_dir_del(ip, &dotname); |
963 | if (error) | |
964 | return error; | |
965 | ||
966 | error = gfs2_change_nlink(ip, -2); | |
967 | if (error) | |
968 | return error; | |
969 | ||
b3b94faa DT |
970 | return error; |
971 | } | |
972 | ||
973 | /* | |
974 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
975 | * @dip: the directory | |
976 | * @name: the name of the file | |
977 | * @ip: the inode | |
978 | * | |
979 | * Assumes that the lock on (at least) @dip is held. | |
980 | * | |
981 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
982 | */ | |
983 | ||
feaa7bba | 984 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
985 | struct gfs2_inode *ip) |
986 | { | |
987 | struct gfs2_inum inum; | |
988 | unsigned int type; | |
989 | int error; | |
990 | ||
feaa7bba | 991 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
992 | return -EPERM; |
993 | ||
994 | if ((dip->i_di.di_mode & S_ISVTX) && | |
995 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 996 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
997 | return -EPERM; |
998 | ||
feaa7bba | 999 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1000 | return -EPERM; |
1001 | ||
faf450ef | 1002 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1003 | if (error) |
1004 | return error; | |
1005 | ||
feaa7bba | 1006 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1007 | if (error) |
1008 | return error; | |
1009 | ||
1010 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1011 | return -ENOENT; | |
1012 | ||
1013 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1014 | gfs2_consist_inode(dip); | |
1015 | return -EIO; | |
1016 | } | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1023 | * @this: move this | |
1024 | * @to: to here | |
1025 | * | |
1026 | * Follow @to back to the root and make sure we don't encounter @this | |
1027 | * Assumes we already hold the rename lock. | |
1028 | * | |
1029 | * Returns: errno | |
1030 | */ | |
1031 | ||
1032 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1033 | { | |
feaa7bba | 1034 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1035 | struct super_block *sb = dir->i_sb; |
7359a19c | 1036 | struct inode *tmp; |
b3b94faa DT |
1037 | struct qstr dotdot; |
1038 | int error = 0; | |
1039 | ||
71b86f56 | 1040 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1041 | |
7359a19c | 1042 | igrab(dir); |
b3b94faa DT |
1043 | |
1044 | for (;;) { | |
feaa7bba | 1045 | if (dir == &this->i_inode) { |
b3b94faa DT |
1046 | error = -EINVAL; |
1047 | break; | |
1048 | } | |
c9fd4307 | 1049 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1050 | error = 0; |
1051 | break; | |
1052 | } | |
1053 | ||
c752666c SW |
1054 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1055 | if (IS_ERR(tmp)) { | |
1056 | error = PTR_ERR(tmp); | |
b3b94faa | 1057 | break; |
c752666c | 1058 | } |
b3b94faa | 1059 | |
7359a19c SW |
1060 | iput(dir); |
1061 | dir = tmp; | |
b3b94faa DT |
1062 | } |
1063 | ||
7359a19c | 1064 | iput(dir); |
b3b94faa DT |
1065 | |
1066 | return error; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * gfs2_readlinki - return the contents of a symlink | |
1071 | * @ip: the symlink's inode | |
1072 | * @buf: a pointer to the buffer to be filled | |
1073 | * @len: a pointer to the length of @buf | |
1074 | * | |
1075 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1076 | * to be freed by the caller. | |
1077 | * | |
1078 | * Returns: errno | |
1079 | */ | |
1080 | ||
1081 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1082 | { | |
1083 | struct gfs2_holder i_gh; | |
1084 | struct buffer_head *dibh; | |
1085 | unsigned int x; | |
1086 | int error; | |
1087 | ||
1088 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1089 | error = gfs2_glock_nq_atime(&i_gh); | |
1090 | if (error) { | |
1091 | gfs2_holder_uninit(&i_gh); | |
1092 | return error; | |
1093 | } | |
1094 | ||
1095 | if (!ip->i_di.di_size) { | |
1096 | gfs2_consist_inode(ip); | |
1097 | error = -EIO; | |
1098 | goto out; | |
1099 | } | |
1100 | ||
1101 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1102 | if (error) | |
1103 | goto out; | |
1104 | ||
1105 | x = ip->i_di.di_size + 1; | |
1106 | if (x > *len) { | |
1107 | *buf = kmalloc(x, GFP_KERNEL); | |
1108 | if (!*buf) { | |
1109 | error = -ENOMEM; | |
1110 | goto out_brelse; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1115 | *len = x; | |
1116 | ||
feaa7bba | 1117 | out_brelse: |
b3b94faa | 1118 | brelse(dibh); |
feaa7bba | 1119 | out: |
b3b94faa | 1120 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1121 | return error; |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1126 | * conditionally update the inode's atime | |
1127 | * @gh: the holder to acquire | |
1128 | * | |
1129 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1130 | * Update if the difference between the current time and the inode's current | |
1131 | * atime is greater than an interval specified at mount. | |
1132 | * | |
1133 | * Returns: errno | |
1134 | */ | |
1135 | ||
1136 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1137 | { | |
1138 | struct gfs2_glock *gl = gh->gh_gl; | |
1139 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1140 | struct gfs2_inode *ip = gl->gl_object; |
b3b94faa DT |
1141 | int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
1142 | unsigned int state; | |
1143 | int flags; | |
1144 | int error; | |
1145 | ||
1146 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1147 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1148 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1149 | return -EINVAL; | |
1150 | ||
1151 | state = gh->gh_state; | |
1152 | flags = gh->gh_flags; | |
1153 | ||
1154 | error = gfs2_glock_nq(gh); | |
1155 | if (error) | |
1156 | return error; | |
1157 | ||
1158 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1159 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1160 | return 0; | |
1161 | ||
1162 | curtime = get_seconds(); | |
1163 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1164 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1165 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1166 | gh); | |
b3b94faa DT |
1167 | error = gfs2_glock_nq(gh); |
1168 | if (error) | |
1169 | return error; | |
1170 | ||
1171 | /* Verify that atime hasn't been updated while we were | |
1172 | trying to get exclusive lock. */ | |
1173 | ||
1174 | curtime = get_seconds(); | |
1175 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1176 | struct buffer_head *dibh; | |
1177 | ||
1178 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1179 | if (error == -EROFS) | |
1180 | return 0; | |
1181 | if (error) | |
1182 | goto fail; | |
1183 | ||
1184 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1185 | if (error) | |
1186 | goto fail_end_trans; | |
1187 | ||
1188 | ip->i_di.di_atime = curtime; | |
1189 | ||
d4e9c4c3 | 1190 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1191 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1192 | brelse(dibh); | |
1193 | ||
1194 | gfs2_trans_end(sdp); | |
1195 | } | |
1196 | ||
1197 | /* If someone else has asked for the glock, | |
1198 | unlock and let them have it. Then reacquire | |
1199 | in the original state. */ | |
1200 | if (gfs2_glock_is_blocking(gl)) { | |
1201 | gfs2_glock_dq(gh); | |
1202 | gfs2_holder_reinit(state, flags, gh); | |
1203 | return gfs2_glock_nq(gh); | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | return 0; | |
1208 | ||
feaa7bba | 1209 | fail_end_trans: |
b3b94faa | 1210 | gfs2_trans_end(sdp); |
feaa7bba | 1211 | fail: |
b3b94faa | 1212 | gfs2_glock_dq(gh); |
b3b94faa DT |
1213 | return error; |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1218 | * @arg_a: the first structure | |
1219 | * @arg_b: the second structure | |
1220 | * | |
1221 | * Returns: 1 if A > B | |
1222 | * -1 if A < B | |
1223 | * 0 if A = B | |
1224 | */ | |
1225 | ||
1226 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1227 | { | |
1228 | struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; | |
1229 | struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; | |
1230 | struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1231 | struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
1232 | int ret = 0; | |
1233 | ||
1234 | if (a->ln_number > b->ln_number) | |
1235 | ret = 1; | |
1236 | else if (a->ln_number < b->ln_number) | |
1237 | ret = -1; | |
1238 | else { | |
1239 | if (gh_a->gh_state == LM_ST_SHARED && | |
1240 | gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1241 | ret = 1; | |
1242 | else if (gh_a->gh_state == LM_ST_SHARED && | |
1243 | (gh_b->gh_flags & GL_ATIME)) | |
1244 | ret = 1; | |
1245 | } | |
1246 | ||
1247 | return ret; | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1252 | * atime update | |
1253 | * @num_gh: the number of structures | |
1254 | * @ghs: an array of struct gfs2_holder structures | |
1255 | * | |
1256 | * Returns: 0 on success (all glocks acquired), | |
1257 | * errno on failure (no glocks acquired) | |
1258 | */ | |
1259 | ||
1260 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1261 | { | |
1262 | struct gfs2_holder **p; | |
1263 | unsigned int x; | |
1264 | int error = 0; | |
1265 | ||
1266 | if (!num_gh) | |
1267 | return 0; | |
1268 | ||
1269 | if (num_gh == 1) { | |
1270 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1271 | if (ghs->gh_flags & GL_ATIME) | |
1272 | error = gfs2_glock_nq_atime(ghs); | |
1273 | else | |
1274 | error = gfs2_glock_nq(ghs); | |
1275 | return error; | |
1276 | } | |
1277 | ||
1278 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1279 | if (!p) | |
1280 | return -ENOMEM; | |
1281 | ||
1282 | for (x = 0; x < num_gh; x++) | |
1283 | p[x] = &ghs[x]; | |
1284 | ||
1285 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1286 | ||
1287 | for (x = 0; x < num_gh; x++) { | |
1288 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1289 | ||
1290 | if (p[x]->gh_flags & GL_ATIME) | |
1291 | error = gfs2_glock_nq_atime(p[x]); | |
1292 | else | |
1293 | error = gfs2_glock_nq(p[x]); | |
1294 | ||
1295 | if (error) { | |
1296 | while (x--) | |
1297 | gfs2_glock_dq(p[x]); | |
1298 | break; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | kfree(p); | |
1303 | ||
1304 | return error; | |
1305 | } | |
1306 | ||
b3b94faa DT |
1307 | |
1308 | static int | |
1309 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1310 | { | |
1311 | struct buffer_head *dibh; | |
1312 | int error; | |
1313 | ||
1314 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1315 | if (!error) { | |
feaa7bba SW |
1316 | error = inode_setattr(&ip->i_inode, attr); |
1317 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1318 | gfs2_inode_attr_out(ip); |
1319 | ||
d4e9c4c3 | 1320 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1321 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1322 | brelse(dibh); | |
1323 | } | |
1324 | return error; | |
1325 | } | |
1326 | ||
1327 | /** | |
1328 | * gfs2_setattr_simple - | |
1329 | * @ip: | |
1330 | * @attr: | |
1331 | * | |
1332 | * Called with a reference on the vnode. | |
1333 | * | |
1334 | * Returns: errno | |
1335 | */ | |
1336 | ||
1337 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1338 | { | |
1339 | int error; | |
1340 | ||
5c676f6d | 1341 | if (current->journal_info) |
b3b94faa DT |
1342 | return __gfs2_setattr_simple(ip, attr); |
1343 | ||
feaa7bba | 1344 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1345 | if (error) |
1346 | return error; | |
1347 | ||
1348 | error = __gfs2_setattr_simple(ip, attr); | |
1349 | ||
feaa7bba | 1350 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1351 | |
1352 | return error; | |
1353 | } | |
1354 |