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 DT |
40 | |
41 | /** | |
4340fe62 | 42 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode |
b3b94faa DT |
43 | * @ip: The GFS2 inode (with embedded disk inode data) |
44 | * @inode: The Linux VFS inode | |
45 | * | |
46 | */ | |
47 | ||
4340fe62 | 48 | void gfs2_inode_attr_in(struct gfs2_inode *ip) |
b3b94faa | 49 | { |
4340fe62 | 50 | struct inode *inode = &ip->i_inode; |
c2668711 | 51 | struct gfs2_dinode *di = &ip->i_di; |
4340fe62 SW |
52 | |
53 | inode->i_ino = ip->i_num.no_addr; | |
b3b94faa | 54 | |
c2668711 | 55 | switch (di->di_mode & S_IFMT) { |
b3b94faa DT |
56 | case S_IFBLK: |
57 | case S_IFCHR: | |
c2668711 | 58 | inode->i_rdev = MKDEV(di->di_major, di->di_minor); |
b3b94faa DT |
59 | break; |
60 | default: | |
61 | inode->i_rdev = 0; | |
62 | break; | |
63 | }; | |
64 | ||
c2668711 SW |
65 | inode->i_mode = di->di_mode; |
66 | inode->i_nlink = di->di_nlink; | |
67 | inode->i_uid = di->di_uid; | |
68 | inode->i_gid = di->di_gid; | |
69 | i_size_write(inode, di->di_size); | |
70 | inode->i_atime.tv_sec = di->di_atime; | |
71 | inode->i_mtime.tv_sec = di->di_mtime; | |
72 | inode->i_ctime.tv_sec = di->di_ctime; | |
b3b94faa DT |
73 | inode->i_atime.tv_nsec = 0; |
74 | inode->i_mtime.tv_nsec = 0; | |
75 | inode->i_ctime.tv_nsec = 0; | |
c2668711 | 76 | inode->i_blocks = di->di_blocks << |
feaa7bba | 77 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa | 78 | |
c2668711 | 79 | if (di->di_flags & GFS2_DIF_IMMUTABLE) |
b3b94faa DT |
80 | inode->i_flags |= S_IMMUTABLE; |
81 | else | |
82 | inode->i_flags &= ~S_IMMUTABLE; | |
83 | ||
c2668711 | 84 | if (di->di_flags & GFS2_DIF_APPENDONLY) |
b3b94faa DT |
85 | inode->i_flags |= S_APPEND; |
86 | else | |
87 | inode->i_flags &= ~S_APPEND; | |
88 | } | |
89 | ||
b3b94faa DT |
90 | /** |
91 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
92 | * @ip: The GFS2 inode | |
93 | * | |
94 | * Only copy out the attributes that we want the VFS layer | |
95 | * to be able to modify. | |
96 | */ | |
97 | ||
98 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
99 | { | |
feaa7bba | 100 | struct inode *inode = &ip->i_inode; |
75d3b817 | 101 | struct gfs2_dinode *di = &ip->i_di; |
feaa7bba | 102 | gfs2_assert_withdraw(GFS2_SB(inode), |
75d3b817 SW |
103 | (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
104 | di->di_mode = inode->i_mode; | |
105 | di->di_uid = inode->i_uid; | |
106 | di->di_gid = inode->i_gid; | |
107 | di->di_atime = inode->i_atime.tv_sec; | |
108 | di->di_mtime = inode->i_mtime.tv_sec; | |
109 | di->di_ctime = inode->i_ctime.tv_sec; | |
b3b94faa DT |
110 | } |
111 | ||
feaa7bba SW |
112 | static int iget_test(struct inode *inode, void *opaque) |
113 | { | |
114 | struct gfs2_inode *ip = GFS2_I(inode); | |
115 | struct gfs2_inum *inum = opaque; | |
116 | ||
117 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
118 | return 1; | |
b3b94faa | 119 | |
feaa7bba SW |
120 | return 0; |
121 | } | |
122 | ||
123 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 124 | { |
feaa7bba SW |
125 | struct gfs2_inode *ip = GFS2_I(inode); |
126 | struct gfs2_inum *inum = opaque; | |
b3b94faa | 127 | |
feaa7bba SW |
128 | ip->i_num = *inum; |
129 | return 0; | |
130 | } | |
b3b94faa | 131 | |
feaa7bba SW |
132 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum) |
133 | { | |
134 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
135 | iget_test, inum); | |
136 | } | |
b3b94faa | 137 | |
feaa7bba SW |
138 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) |
139 | { | |
140 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
141 | iget_test, iget_set, inum); | |
b3b94faa DT |
142 | } |
143 | ||
144 | /** | |
feaa7bba SW |
145 | * gfs2_inode_lookup - Lookup an inode |
146 | * @sb: The super block | |
147 | * @inum: The inode number | |
148 | * @type: The type of the inode | |
b3b94faa | 149 | * |
feaa7bba | 150 | * Returns: A VFS inode, or an error |
b3b94faa DT |
151 | */ |
152 | ||
feaa7bba | 153 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type) |
b3b94faa | 154 | { |
feaa7bba SW |
155 | struct inode *inode = gfs2_iget(sb, inum); |
156 | struct gfs2_inode *ip = GFS2_I(inode); | |
157 | struct gfs2_glock *io_gl; | |
158 | int error; | |
b3b94faa | 159 | |
feaa7bba SW |
160 | if (inode->i_state & I_NEW) { |
161 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
162 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 163 | inode->i_private = ip; |
feaa7bba SW |
164 | inode->i_mode = mode; |
165 | ||
166 | if (S_ISREG(mode)) { | |
167 | inode->i_op = &gfs2_file_iops; | |
168 | inode->i_fop = &gfs2_file_fops; | |
169 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
170 | } else if (S_ISDIR(mode)) { | |
171 | inode->i_op = &gfs2_dir_iops; | |
172 | inode->i_fop = &gfs2_dir_fops; | |
173 | } else if (S_ISLNK(mode)) { | |
174 | inode->i_op = &gfs2_symlink_iops; | |
175 | } else { | |
176 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 177 | } |
b3b94faa | 178 | |
feaa7bba SW |
179 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
180 | if (unlikely(error)) | |
181 | goto fail; | |
182 | ip->i_gl->gl_object = ip; | |
b3b94faa | 183 | |
feaa7bba SW |
184 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
185 | if (unlikely(error)) | |
186 | goto fail_put; | |
b3b94faa | 187 | |
feaa7bba SW |
188 | ip->i_vn = ip->i_gl->gl_vn - 1; |
189 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
190 | if (unlikely(error)) | |
191 | goto fail_iopen; | |
b3b94faa | 192 | |
feaa7bba SW |
193 | gfs2_glock_put(io_gl); |
194 | unlock_new_inode(inode); | |
195 | } | |
b3b94faa DT |
196 | |
197 | return inode; | |
feaa7bba SW |
198 | fail_iopen: |
199 | gfs2_glock_put(io_gl); | |
200 | fail_put: | |
201 | ip->i_gl->gl_object = NULL; | |
202 | gfs2_glock_put(ip->i_gl); | |
203 | fail: | |
204 | iput(inode); | |
205 | return ERR_PTR(error); | |
b3b94faa DT |
206 | } |
207 | ||
208 | /** | |
209 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
210 | * @ip: The GFS2 inode | |
211 | * | |
212 | * Returns: errno | |
213 | */ | |
214 | ||
215 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
216 | { | |
217 | struct buffer_head *dibh; | |
218 | int error; | |
219 | ||
220 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
221 | if (error) | |
222 | return error; | |
223 | ||
feaa7bba | 224 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
225 | brelse(dibh); |
226 | return -EIO; | |
227 | } | |
228 | ||
b3b94faa | 229 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
b3b94faa DT |
230 | |
231 | brelse(dibh); | |
232 | ||
233 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
234 | if (gfs2_consist_inode(ip)) | |
235 | gfs2_dinode_print(&ip->i_di); | |
236 | return -EIO; | |
237 | } | |
238 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
239 | return -ESTALE; | |
240 | ||
241 | ip->i_vn = ip->i_gl->gl_vn; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
feaa7bba | 246 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 247 | { |
feaa7bba | 248 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
249 | struct gfs2_alloc *al; |
250 | struct gfs2_rgrpd *rgd; | |
251 | int error; | |
252 | ||
253 | if (ip->i_di.di_blocks != 1) { | |
254 | if (gfs2_consist_inode(ip)) | |
255 | gfs2_dinode_print(&ip->i_di); | |
256 | return -EIO; | |
257 | } | |
258 | ||
259 | al = gfs2_alloc_get(ip); | |
260 | ||
261 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
262 | if (error) | |
263 | goto out; | |
264 | ||
265 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
266 | if (error) | |
267 | goto out_qs; | |
268 | ||
269 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
270 | if (!rgd) { | |
271 | gfs2_consist_inode(ip); | |
272 | error = -EIO; | |
273 | goto out_rindex_relse; | |
274 | } | |
275 | ||
276 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
277 | &al->al_rgd_gh); | |
278 | if (error) | |
279 | goto out_rindex_relse; | |
280 | ||
420b9e5e | 281 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
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 | 314 | struct buffer_head *dibh; |
cd915493 | 315 | u32 nlink; |
b3b94faa DT |
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 | ||
f92a0b6f | 357 | clear_nlink(&ip->i_inode); |
feaa7bba SW |
358 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
359 | gfs2_glock_dq_uninit(&rg_gh); | |
360 | out_norgrp: | |
361 | gfs2_glock_dq_uninit(&ri_gh); | |
362 | } | |
363 | out: | |
364 | return error; | |
b3b94faa DT |
365 | } |
366 | ||
c752666c SW |
367 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
368 | { | |
369 | struct qstr qstr; | |
71b86f56 | 370 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
371 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
372 | } | |
373 | ||
374 | ||
b3b94faa DT |
375 | /** |
376 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
377 | * @d_gh: An initialized holder for the directory glock | |
378 | * @name: The name of the inode to look for | |
379 | * @is_root: If 1, ignore the caller's permissions | |
380 | * @i_gh: An uninitialized holder for the new inode glock | |
381 | * | |
382 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
383 | * @is_root is true. | |
384 | * | |
385 | * Returns: errno | |
386 | */ | |
387 | ||
feaa7bba SW |
388 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
389 | int is_root, struct nameidata *nd) | |
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 | ||
cd915493 | 432 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 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 | ||
cd915493 | 473 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 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; | |
907b9bce | 494 | |
b3b94faa DT |
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; | |
cd915493 | 499 | u64 x, y; |
b3b94faa DT |
500 | |
501 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
502 | if (error) | |
503 | goto out_brelse; | |
504 | ||
cd915493 | 505 | x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
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); |
cd915493 | 514 | *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
b3b94faa DT |
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 | ||
420b9e5e | 525 | out_brelse: |
b3b94faa | 526 | brelse(bh); |
420b9e5e | 527 | out_end_trans: |
f55ab26a | 528 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 529 | gfs2_trans_end(sdp); |
420b9e5e | 530 | out: |
b3b94faa | 531 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
532 | return error; |
533 | } | |
534 | ||
cd915493 | 535 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
536 | { |
537 | int error; | |
538 | ||
539 | error = pick_formal_ino_1(sdp, inum); | |
540 | if (error <= 0) | |
541 | return error; | |
542 | ||
543 | error = pick_formal_ino_2(sdp, inum); | |
544 | ||
545 | return error; | |
546 | } | |
547 | ||
548 | /** | |
549 | * create_ok - OK to create a new on-disk inode here? | |
550 | * @dip: Directory in which dinode is to be created | |
551 | * @name: Name of new dinode | |
552 | * @mode: | |
553 | * | |
554 | * Returns: errno | |
555 | */ | |
556 | ||
feaa7bba | 557 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
558 | unsigned int mode) |
559 | { | |
560 | int error; | |
561 | ||
faf450ef | 562 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
563 | if (error) |
564 | return error; | |
565 | ||
566 | /* Don't create entries in an unlinked directory */ | |
567 | if (!dip->i_di.di_nlink) | |
568 | return -EPERM; | |
569 | ||
feaa7bba | 570 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
571 | switch (error) { |
572 | case -ENOENT: | |
573 | error = 0; | |
574 | break; | |
575 | case 0: | |
576 | return -EEXIST; | |
577 | default: | |
578 | return error; | |
579 | } | |
580 | ||
cd915493 | 581 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 582 | return -EFBIG; |
cd915493 | 583 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1) |
b3b94faa DT |
584 | return -EMLINK; |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
590 | unsigned int *uid, unsigned int *gid) | |
591 | { | |
feaa7bba | 592 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
420b9e5e | 593 | (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) { |
b3b94faa DT |
594 | if (S_ISDIR(*mode)) |
595 | *mode |= S_ISUID; | |
596 | else if (dip->i_di.di_uid != current->fsuid) | |
597 | *mode &= ~07111; | |
598 | *uid = dip->i_di.di_uid; | |
599 | } else | |
600 | *uid = current->fsuid; | |
601 | ||
602 | if (dip->i_di.di_mode & S_ISGID) { | |
603 | if (S_ISDIR(*mode)) | |
604 | *mode |= S_ISGID; | |
605 | *gid = dip->i_di.di_gid; | |
606 | } else | |
607 | *gid = current->fsgid; | |
608 | } | |
609 | ||
4340fe62 SW |
610 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum, |
611 | u64 *generation) | |
b3b94faa | 612 | { |
feaa7bba | 613 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
614 | int error; |
615 | ||
616 | gfs2_alloc_get(dip); | |
617 | ||
618 | dip->i_alloc.al_requested = RES_DINODE; | |
619 | error = gfs2_inplace_reserve(dip); | |
620 | if (error) | |
621 | goto out; | |
622 | ||
feaa7bba | 623 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
624 | if (error) |
625 | goto out_ipreserv; | |
626 | ||
4340fe62 | 627 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
628 | |
629 | gfs2_trans_end(sdp); | |
630 | ||
4340fe62 | 631 | out_ipreserv: |
b3b94faa | 632 | gfs2_inplace_release(dip); |
4340fe62 | 633 | out: |
b3b94faa | 634 | gfs2_alloc_put(dip); |
b3b94faa DT |
635 | return error; |
636 | } | |
637 | ||
638 | /** | |
639 | * init_dinode - Fill in a new dinode structure | |
640 | * @dip: the directory this inode is being created in | |
641 | * @gl: The glock covering the new inode | |
642 | * @inum: the inode number | |
643 | * @mode: the file permissions | |
644 | * @uid: | |
645 | * @gid: | |
646 | * | |
647 | */ | |
648 | ||
649 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
650 | const struct gfs2_inum *inum, unsigned int mode, |
651 | unsigned int uid, unsigned int gid, | |
652 | const u64 *generation) | |
b3b94faa | 653 | { |
feaa7bba | 654 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 655 | struct gfs2_dinode *di; |
b3b94faa DT |
656 | struct buffer_head *dibh; |
657 | ||
658 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 659 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
660 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
661 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
662 | di = (struct gfs2_dinode *)dibh->b_data; |
663 | ||
2442a098 SW |
664 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
665 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
666 | di->di_mode = cpu_to_be32(mode); |
667 | di->di_uid = cpu_to_be32(uid); | |
668 | di->di_gid = cpu_to_be32(gid); | |
669 | di->di_nlink = cpu_to_be32(0); | |
670 | di->di_size = cpu_to_be64(0); | |
671 | di->di_blocks = cpu_to_be64(1); | |
672 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
673 | di->di_major = di->di_minor = cpu_to_be32(0); | |
674 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
4340fe62 | 675 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 676 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
677 | |
678 | if (S_ISREG(mode)) { | |
679 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
680 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 681 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
682 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
683 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 684 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 685 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
686 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
687 | GFS2_DIF_INHERIT_DIRECTIO); | |
688 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
689 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
690 | } |
691 | ||
b96ca4fa | 692 | di->__pad1 = 0; |
b2a580d8 | 693 | di->di_payload_format = cpu_to_be32(0); |
b96ca4fa SW |
694 | di->di_height = cpu_to_be32(0); |
695 | di->__pad2 = 0; | |
696 | di->__pad3 = 0; | |
697 | di->di_depth = cpu_to_be16(0); | |
698 | di->di_entries = cpu_to_be32(0); | |
699 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
700 | di->di_eattr = cpu_to_be64(0); | |
701 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
702 | ||
b3b94faa DT |
703 | brelse(dibh); |
704 | } | |
705 | ||
706 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
707 | unsigned int mode, const struct gfs2_inum *inum, |
708 | const u64 *generation) | |
b3b94faa | 709 | { |
feaa7bba | 710 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
711 | unsigned int uid, gid; |
712 | int error; | |
713 | ||
714 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
715 | gfs2_alloc_get(dip); |
716 | ||
717 | error = gfs2_quota_lock(dip, uid, gid); | |
718 | if (error) | |
719 | goto out; | |
720 | ||
721 | error = gfs2_quota_check(dip, uid, gid); | |
722 | if (error) | |
723 | goto out_quota; | |
724 | ||
feaa7bba | 725 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
726 | if (error) |
727 | goto out_quota; | |
728 | ||
4340fe62 | 729 | init_dinode(dip, gl, inum, mode, uid, gid, generation); |
b3b94faa | 730 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
731 | gfs2_trans_end(sdp); |
732 | ||
feaa7bba | 733 | out_quota: |
b3b94faa | 734 | gfs2_quota_unlock(dip); |
feaa7bba | 735 | out: |
b3b94faa | 736 | gfs2_alloc_put(dip); |
b3b94faa DT |
737 | return error; |
738 | } | |
739 | ||
feaa7bba SW |
740 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
741 | struct gfs2_inode *ip) | |
b3b94faa | 742 | { |
feaa7bba | 743 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
744 | struct gfs2_alloc *al; |
745 | int alloc_required; | |
746 | struct buffer_head *dibh; | |
747 | int error; | |
748 | ||
749 | al = gfs2_alloc_get(dip); | |
750 | ||
751 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
752 | if (error) | |
753 | goto fail; | |
754 | ||
feaa7bba | 755 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
756 | if (alloc_required < 0) |
757 | goto fail; | |
b3b94faa DT |
758 | if (alloc_required) { |
759 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
760 | dip->i_di.di_gid); | |
761 | if (error) | |
762 | goto fail_quota_locks; | |
763 | ||
764 | al->al_requested = sdp->sd_max_dirres; | |
765 | ||
766 | error = gfs2_inplace_reserve(dip); | |
767 | if (error) | |
768 | goto fail_quota_locks; | |
769 | ||
320dd101 | 770 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 771 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 772 | 2 * RES_DINODE + |
b3b94faa DT |
773 | RES_STATFS + RES_QUOTA, 0); |
774 | if (error) | |
775 | goto fail_ipreserv; | |
776 | } else { | |
feaa7bba | 777 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
778 | if (error) |
779 | goto fail_quota_locks; | |
780 | } | |
781 | ||
feaa7bba | 782 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
783 | if (error) |
784 | goto fail_end_trans; | |
785 | ||
786 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
787 | if (error) | |
788 | goto fail_end_trans; | |
789 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 790 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
791 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
792 | brelse(dibh); | |
b3b94faa DT |
793 | return 0; |
794 | ||
320dd101 | 795 | fail_end_trans: |
b3b94faa DT |
796 | gfs2_trans_end(sdp); |
797 | ||
320dd101 | 798 | fail_ipreserv: |
b3b94faa DT |
799 | if (dip->i_alloc.al_rgd) |
800 | gfs2_inplace_release(dip); | |
801 | ||
320dd101 | 802 | fail_quota_locks: |
b3b94faa DT |
803 | gfs2_quota_unlock(dip); |
804 | ||
320dd101 | 805 | fail: |
b3b94faa | 806 | gfs2_alloc_put(dip); |
b3b94faa DT |
807 | return error; |
808 | } | |
809 | ||
fcb47e0b RH |
810 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
811 | { | |
812 | int err; | |
813 | size_t len; | |
814 | void *value; | |
815 | char *name; | |
816 | struct gfs2_ea_request er; | |
817 | ||
818 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
819 | &name, &value, &len); | |
820 | ||
821 | if (err) { | |
822 | if (err == -EOPNOTSUPP) | |
823 | return 0; | |
824 | return err; | |
825 | } | |
826 | ||
827 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
828 | ||
829 | er.er_type = GFS2_EATYPE_SECURITY; | |
830 | er.er_name = name; | |
831 | er.er_data = value; | |
832 | er.er_name_len = strlen(name); | |
833 | er.er_data_len = len; | |
834 | ||
835 | err = gfs2_ea_set_i(ip, &er); | |
836 | ||
837 | kfree(value); | |
838 | kfree(name); | |
839 | ||
840 | return err; | |
841 | } | |
842 | ||
b3b94faa DT |
843 | /** |
844 | * gfs2_createi - Create a new inode | |
845 | * @ghs: An array of two holders | |
846 | * @name: The name of the new file | |
847 | * @mode: the permissions on the new inode | |
848 | * | |
849 | * @ghs[0] is an initialized holder for the directory | |
850 | * @ghs[1] is the holder for the inode lock | |
851 | * | |
7359a19c | 852 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
853 | * file are held. A transaction has been started and an inplace reservation |
854 | * is held, as well. | |
855 | * | |
7359a19c | 856 | * Returns: An inode |
b3b94faa DT |
857 | */ |
858 | ||
feaa7bba | 859 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
568f4c96 | 860 | unsigned int mode) |
b3b94faa | 861 | { |
7359a19c | 862 | struct inode *inode; |
5c676f6d | 863 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
864 | struct inode *dir = &dip->i_inode; |
865 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
866 | struct gfs2_inum inum; | |
b3b94faa | 867 | int error; |
4340fe62 | 868 | u64 generation; |
b3b94faa DT |
869 | |
870 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 871 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 872 | |
b3b94faa DT |
873 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
874 | error = gfs2_glock_nq(ghs); | |
875 | if (error) | |
876 | goto fail; | |
877 | ||
878 | error = create_ok(dip, name, mode); | |
879 | if (error) | |
880 | goto fail_gunlock; | |
881 | ||
feaa7bba | 882 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
883 | if (error) |
884 | goto fail_gunlock; | |
885 | ||
4340fe62 | 886 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
887 | if (error) |
888 | goto fail_gunlock; | |
889 | ||
feaa7bba | 890 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
891 | gfs2_glock_dq(ghs); |
892 | ||
feaa7bba | 893 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
894 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
895 | GL_SKIP, ghs + 1); | |
b3b94faa | 896 | if (error) { |
7359a19c | 897 | return ERR_PTR(error); |
b3b94faa DT |
898 | } |
899 | ||
900 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
901 | error = gfs2_glock_nq(ghs); | |
902 | if (error) { | |
903 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 904 | return ERR_PTR(error); |
b3b94faa DT |
905 | } |
906 | ||
907 | error = create_ok(dip, name, mode); | |
908 | if (error) | |
909 | goto fail_gunlock2; | |
910 | } else { | |
feaa7bba | 911 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
912 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
913 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
914 | if (error) |
915 | goto fail_gunlock; | |
916 | } | |
917 | ||
4340fe62 | 918 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); |
b3b94faa DT |
919 | if (error) |
920 | goto fail_gunlock2; | |
921 | ||
feaa7bba SW |
922 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
923 | if (IS_ERR(inode)) | |
b3b94faa DT |
924 | goto fail_gunlock2; |
925 | ||
feaa7bba | 926 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
927 | if (error) |
928 | goto fail_iput; | |
929 | ||
feaa7bba | 930 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
931 | if (error) |
932 | goto fail_iput; | |
933 | ||
fcb47e0b RH |
934 | error = gfs2_security_init(dip, GFS2_I(inode)); |
935 | if (error) | |
936 | goto fail_iput; | |
937 | ||
feaa7bba | 938 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
939 | if (error) |
940 | goto fail_iput; | |
941 | ||
7359a19c SW |
942 | if (!inode) |
943 | return ERR_PTR(-ENOMEM); | |
944 | return inode; | |
b3b94faa | 945 | |
320dd101 | 946 | fail_iput: |
feaa7bba | 947 | iput(inode); |
320dd101 | 948 | fail_gunlock2: |
b3b94faa | 949 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 950 | fail_gunlock: |
b3b94faa | 951 | gfs2_glock_dq(ghs); |
320dd101 | 952 | fail: |
7359a19c | 953 | return ERR_PTR(error); |
b3b94faa DT |
954 | } |
955 | ||
b3b94faa DT |
956 | /** |
957 | * gfs2_rmdiri - Remove a directory | |
958 | * @dip: The parent directory of the directory to be removed | |
959 | * @name: The name of the directory to be removed | |
960 | * @ip: The GFS2 inode of the directory to be removed | |
961 | * | |
962 | * Assumes Glocks on dip and ip are held | |
963 | * | |
964 | * Returns: errno | |
965 | */ | |
966 | ||
feaa7bba SW |
967 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
968 | struct gfs2_inode *ip) | |
b3b94faa | 969 | { |
b3b94faa DT |
970 | struct qstr dotname; |
971 | int error; | |
972 | ||
973 | if (ip->i_di.di_entries != 2) { | |
974 | if (gfs2_consist_inode(ip)) | |
975 | gfs2_dinode_print(&ip->i_di); | |
976 | return -EIO; | |
977 | } | |
978 | ||
979 | error = gfs2_dir_del(dip, name); | |
980 | if (error) | |
981 | return error; | |
982 | ||
983 | error = gfs2_change_nlink(dip, -1); | |
984 | if (error) | |
985 | return error; | |
986 | ||
71b86f56 | 987 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
988 | error = gfs2_dir_del(ip, &dotname); |
989 | if (error) | |
990 | return error; | |
991 | ||
feaa7bba | 992 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
993 | error = gfs2_dir_del(ip, &dotname); |
994 | if (error) | |
995 | return error; | |
996 | ||
997 | error = gfs2_change_nlink(ip, -2); | |
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, |
b3b94faa DT |
1016 | struct gfs2_inode *ip) |
1017 | { | |
1018 | struct gfs2_inum inum; | |
1019 | unsigned int type; | |
1020 | int error; | |
1021 | ||
feaa7bba | 1022 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1023 | return -EPERM; |
1024 | ||
1025 | if ((dip->i_di.di_mode & S_ISVTX) && | |
1026 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 1027 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
1028 | return -EPERM; |
1029 | ||
feaa7bba | 1030 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1031 | return -EPERM; |
1032 | ||
faf450ef | 1033 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1034 | if (error) |
1035 | return error; | |
1036 | ||
feaa7bba | 1037 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1038 | if (error) |
1039 | return error; | |
1040 | ||
1041 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1042 | return -ENOENT; | |
1043 | ||
1044 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1045 | gfs2_consist_inode(dip); | |
1046 | return -EIO; | |
1047 | } | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1054 | * @this: move this | |
1055 | * @to: to here | |
1056 | * | |
1057 | * Follow @to back to the root and make sure we don't encounter @this | |
1058 | * Assumes we already hold the rename lock. | |
1059 | * | |
1060 | * Returns: errno | |
1061 | */ | |
1062 | ||
1063 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1064 | { | |
feaa7bba | 1065 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1066 | struct super_block *sb = dir->i_sb; |
7359a19c | 1067 | struct inode *tmp; |
b3b94faa DT |
1068 | struct qstr dotdot; |
1069 | int error = 0; | |
1070 | ||
71b86f56 | 1071 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1072 | |
7359a19c | 1073 | igrab(dir); |
b3b94faa DT |
1074 | |
1075 | for (;;) { | |
feaa7bba | 1076 | if (dir == &this->i_inode) { |
b3b94faa DT |
1077 | error = -EINVAL; |
1078 | break; | |
1079 | } | |
c9fd4307 | 1080 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1081 | error = 0; |
1082 | break; | |
1083 | } | |
1084 | ||
c752666c SW |
1085 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1086 | if (IS_ERR(tmp)) { | |
1087 | error = PTR_ERR(tmp); | |
b3b94faa | 1088 | break; |
c752666c | 1089 | } |
b3b94faa | 1090 | |
7359a19c SW |
1091 | iput(dir); |
1092 | dir = tmp; | |
b3b94faa DT |
1093 | } |
1094 | ||
7359a19c | 1095 | iput(dir); |
b3b94faa DT |
1096 | |
1097 | return error; | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * gfs2_readlinki - return the contents of a symlink | |
1102 | * @ip: the symlink's inode | |
1103 | * @buf: a pointer to the buffer to be filled | |
1104 | * @len: a pointer to the length of @buf | |
1105 | * | |
1106 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1107 | * to be freed by the caller. | |
1108 | * | |
1109 | * Returns: errno | |
1110 | */ | |
1111 | ||
1112 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1113 | { | |
1114 | struct gfs2_holder i_gh; | |
1115 | struct buffer_head *dibh; | |
1116 | unsigned int x; | |
1117 | int error; | |
1118 | ||
1119 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1120 | error = gfs2_glock_nq_atime(&i_gh); | |
1121 | if (error) { | |
1122 | gfs2_holder_uninit(&i_gh); | |
1123 | return error; | |
1124 | } | |
1125 | ||
1126 | if (!ip->i_di.di_size) { | |
1127 | gfs2_consist_inode(ip); | |
1128 | error = -EIO; | |
1129 | goto out; | |
1130 | } | |
1131 | ||
1132 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1133 | if (error) | |
1134 | goto out; | |
1135 | ||
1136 | x = ip->i_di.di_size + 1; | |
1137 | if (x > *len) { | |
1138 | *buf = kmalloc(x, GFP_KERNEL); | |
1139 | if (!*buf) { | |
1140 | error = -ENOMEM; | |
1141 | goto out_brelse; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1146 | *len = x; | |
1147 | ||
feaa7bba | 1148 | out_brelse: |
b3b94faa | 1149 | brelse(dibh); |
feaa7bba | 1150 | out: |
b3b94faa | 1151 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1152 | return error; |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1157 | * conditionally update the inode's atime | |
1158 | * @gh: the holder to acquire | |
1159 | * | |
1160 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1161 | * Update if the difference between the current time and the inode's current | |
1162 | * atime is greater than an interval specified at mount. | |
1163 | * | |
1164 | * Returns: errno | |
1165 | */ | |
1166 | ||
1167 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1168 | { | |
1169 | struct gfs2_glock *gl = gh->gh_gl; | |
1170 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1171 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1172 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1173 | unsigned int state; |
1174 | int flags; | |
1175 | int error; | |
1176 | ||
1177 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1178 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1179 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | state = gh->gh_state; | |
1183 | flags = gh->gh_flags; | |
1184 | ||
1185 | error = gfs2_glock_nq(gh); | |
1186 | if (error) | |
1187 | return error; | |
1188 | ||
1189 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1190 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1191 | return 0; | |
1192 | ||
1193 | curtime = get_seconds(); | |
1194 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1195 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1196 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1197 | gh); | |
b3b94faa DT |
1198 | error = gfs2_glock_nq(gh); |
1199 | if (error) | |
1200 | return error; | |
1201 | ||
1202 | /* Verify that atime hasn't been updated while we were | |
1203 | trying to get exclusive lock. */ | |
1204 | ||
1205 | curtime = get_seconds(); | |
1206 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1207 | struct buffer_head *dibh; | |
48516ced | 1208 | struct gfs2_dinode *di; |
b3b94faa DT |
1209 | |
1210 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1211 | if (error == -EROFS) | |
1212 | return 0; | |
1213 | if (error) | |
1214 | goto fail; | |
1215 | ||
1216 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1217 | if (error) | |
1218 | goto fail_end_trans; | |
1219 | ||
1220 | ip->i_di.di_atime = curtime; | |
1221 | ||
d4e9c4c3 | 1222 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced SW |
1223 | di = (struct gfs2_dinode *)dibh->b_data; |
1224 | di->di_atime = cpu_to_be64(ip->i_di.di_atime); | |
b3b94faa DT |
1225 | brelse(dibh); |
1226 | ||
1227 | gfs2_trans_end(sdp); | |
1228 | } | |
1229 | ||
1230 | /* If someone else has asked for the glock, | |
1231 | unlock and let them have it. Then reacquire | |
1232 | in the original state. */ | |
1233 | if (gfs2_glock_is_blocking(gl)) { | |
1234 | gfs2_glock_dq(gh); | |
1235 | gfs2_holder_reinit(state, flags, gh); | |
1236 | return gfs2_glock_nq(gh); | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | return 0; | |
1241 | ||
feaa7bba | 1242 | fail_end_trans: |
b3b94faa | 1243 | gfs2_trans_end(sdp); |
feaa7bba | 1244 | fail: |
b3b94faa | 1245 | gfs2_glock_dq(gh); |
b3b94faa DT |
1246 | return error; |
1247 | } | |
1248 | ||
1249 | /** | |
1250 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1251 | * @arg_a: the first structure | |
1252 | * @arg_b: the second structure | |
1253 | * | |
1254 | * Returns: 1 if A > B | |
1255 | * -1 if A < B | |
75d3b817 | 1256 | * 0 if A == B |
b3b94faa DT |
1257 | */ |
1258 | ||
1259 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1260 | { | |
75d3b817 SW |
1261 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1262 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1263 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1264 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1265 | |
1266 | if (a->ln_number > b->ln_number) | |
75d3b817 SW |
1267 | return 1; |
1268 | if (a->ln_number < b->ln_number) | |
1269 | return -1; | |
1270 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1271 | return 1; | |
1272 | if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) | |
1273 | return 1; | |
b3b94faa | 1274 | |
75d3b817 | 1275 | return 0; |
b3b94faa DT |
1276 | } |
1277 | ||
1278 | /** | |
1279 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1280 | * atime update | |
1281 | * @num_gh: the number of structures | |
1282 | * @ghs: an array of struct gfs2_holder structures | |
1283 | * | |
1284 | * Returns: 0 on success (all glocks acquired), | |
1285 | * errno on failure (no glocks acquired) | |
1286 | */ | |
1287 | ||
1288 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1289 | { | |
1290 | struct gfs2_holder **p; | |
1291 | unsigned int x; | |
1292 | int error = 0; | |
1293 | ||
1294 | if (!num_gh) | |
1295 | return 0; | |
1296 | ||
1297 | if (num_gh == 1) { | |
1298 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1299 | if (ghs->gh_flags & GL_ATIME) | |
1300 | error = gfs2_glock_nq_atime(ghs); | |
1301 | else | |
1302 | error = gfs2_glock_nq(ghs); | |
1303 | return error; | |
1304 | } | |
1305 | ||
1306 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1307 | if (!p) | |
1308 | return -ENOMEM; | |
1309 | ||
1310 | for (x = 0; x < num_gh; x++) | |
1311 | p[x] = &ghs[x]; | |
1312 | ||
1313 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1314 | ||
1315 | for (x = 0; x < num_gh; x++) { | |
1316 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1317 | ||
1318 | if (p[x]->gh_flags & GL_ATIME) | |
1319 | error = gfs2_glock_nq_atime(p[x]); | |
1320 | else | |
1321 | error = gfs2_glock_nq(p[x]); | |
1322 | ||
1323 | if (error) { | |
1324 | while (x--) | |
1325 | gfs2_glock_dq(p[x]); | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | ||
1330 | kfree(p); | |
b3b94faa DT |
1331 | return error; |
1332 | } | |
1333 | ||
b3b94faa DT |
1334 | |
1335 | static int | |
1336 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1337 | { | |
1338 | struct buffer_head *dibh; | |
1339 | int error; | |
1340 | ||
1341 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1342 | if (!error) { | |
feaa7bba SW |
1343 | error = inode_setattr(&ip->i_inode, attr); |
1344 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1345 | gfs2_inode_attr_out(ip); |
1346 | ||
d4e9c4c3 | 1347 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1348 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1349 | brelse(dibh); | |
1350 | } | |
1351 | return error; | |
1352 | } | |
1353 | ||
1354 | /** | |
1355 | * gfs2_setattr_simple - | |
1356 | * @ip: | |
1357 | * @attr: | |
1358 | * | |
1359 | * Called with a reference on the vnode. | |
1360 | * | |
1361 | * Returns: errno | |
1362 | */ | |
1363 | ||
1364 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1365 | { | |
1366 | int error; | |
1367 | ||
5c676f6d | 1368 | if (current->journal_info) |
b3b94faa DT |
1369 | return __gfs2_setattr_simple(ip, attr); |
1370 | ||
feaa7bba | 1371 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1372 | if (error) |
1373 | return error; | |
1374 | ||
1375 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1376 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1377 | return error; |
1378 | } | |
1379 |