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; |
3ca68df6 | 51 | struct gfs2_dinode_host *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; |
3ca68df6 | 101 | struct gfs2_dinode_host *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 | |
26d83ded SW |
160 | if (!inode) |
161 | return ERR_PTR(-ENOBUFS); | |
162 | ||
feaa7bba SW |
163 | if (inode->i_state & I_NEW) { |
164 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
165 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 166 | inode->i_private = ip; |
feaa7bba SW |
167 | inode->i_mode = mode; |
168 | ||
169 | if (S_ISREG(mode)) { | |
170 | inode->i_op = &gfs2_file_iops; | |
171 | inode->i_fop = &gfs2_file_fops; | |
172 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
173 | } else if (S_ISDIR(mode)) { | |
174 | inode->i_op = &gfs2_dir_iops; | |
175 | inode->i_fop = &gfs2_dir_fops; | |
176 | } else if (S_ISLNK(mode)) { | |
177 | inode->i_op = &gfs2_symlink_iops; | |
178 | } else { | |
179 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 180 | } |
b3b94faa | 181 | |
feaa7bba SW |
182 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
183 | if (unlikely(error)) | |
184 | goto fail; | |
185 | ip->i_gl->gl_object = ip; | |
b3b94faa | 186 | |
feaa7bba SW |
187 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
188 | if (unlikely(error)) | |
189 | goto fail_put; | |
b3b94faa | 190 | |
feaa7bba SW |
191 | ip->i_vn = ip->i_gl->gl_vn - 1; |
192 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
193 | if (unlikely(error)) | |
194 | goto fail_iopen; | |
b3b94faa | 195 | |
feaa7bba SW |
196 | gfs2_glock_put(io_gl); |
197 | unlock_new_inode(inode); | |
198 | } | |
b3b94faa DT |
199 | |
200 | return inode; | |
feaa7bba SW |
201 | fail_iopen: |
202 | gfs2_glock_put(io_gl); | |
203 | fail_put: | |
204 | ip->i_gl->gl_object = NULL; | |
205 | gfs2_glock_put(ip->i_gl); | |
206 | fail: | |
207 | iput(inode); | |
208 | return ERR_PTR(error); | |
b3b94faa DT |
209 | } |
210 | ||
211 | /** | |
212 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
213 | * @ip: The GFS2 inode | |
214 | * | |
215 | * Returns: errno | |
216 | */ | |
217 | ||
218 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
219 | { | |
220 | struct buffer_head *dibh; | |
221 | int error; | |
222 | ||
223 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
224 | if (error) | |
225 | return error; | |
226 | ||
feaa7bba | 227 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
228 | brelse(dibh); |
229 | return -EIO; | |
230 | } | |
231 | ||
b3b94faa | 232 | gfs2_dinode_in(&ip->i_di, dibh->b_data); |
b3b94faa DT |
233 | |
234 | brelse(dibh); | |
235 | ||
236 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
237 | if (gfs2_consist_inode(ip)) | |
238 | gfs2_dinode_print(&ip->i_di); | |
239 | return -EIO; | |
240 | } | |
241 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
242 | return -ESTALE; | |
243 | ||
244 | ip->i_vn = ip->i_gl->gl_vn; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
feaa7bba | 249 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 250 | { |
feaa7bba | 251 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
252 | struct gfs2_alloc *al; |
253 | struct gfs2_rgrpd *rgd; | |
254 | int error; | |
255 | ||
256 | if (ip->i_di.di_blocks != 1) { | |
257 | if (gfs2_consist_inode(ip)) | |
258 | gfs2_dinode_print(&ip->i_di); | |
259 | return -EIO; | |
260 | } | |
261 | ||
262 | al = gfs2_alloc_get(ip); | |
263 | ||
264 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
265 | if (error) | |
266 | goto out; | |
267 | ||
268 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
269 | if (error) | |
270 | goto out_qs; | |
271 | ||
272 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
273 | if (!rgd) { | |
274 | gfs2_consist_inode(ip); | |
275 | error = -EIO; | |
276 | goto out_rindex_relse; | |
277 | } | |
278 | ||
279 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
280 | &al->al_rgd_gh); | |
281 | if (error) | |
282 | goto out_rindex_relse; | |
283 | ||
420b9e5e | 284 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
285 | if (error) |
286 | goto out_rg_gunlock; | |
287 | ||
288 | gfs2_trans_add_gl(ip->i_gl); | |
289 | ||
290 | gfs2_free_di(rgd, ip); | |
291 | ||
b3b94faa DT |
292 | gfs2_trans_end(sdp); |
293 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
294 | ||
feaa7bba | 295 | out_rg_gunlock: |
b3b94faa | 296 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 297 | out_rindex_relse: |
b3b94faa | 298 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 299 | out_qs: |
b3b94faa | 300 | gfs2_quota_unhold(ip); |
36327521 | 301 | out: |
feaa7bba | 302 | gfs2_alloc_put(ip); |
b3b94faa DT |
303 | return error; |
304 | } | |
305 | ||
b3b94faa DT |
306 | /** |
307 | * gfs2_change_nlink - Change nlink count on inode | |
308 | * @ip: The GFS2 inode | |
309 | * @diff: The change in the nlink count required | |
310 | * | |
311 | * Returns: errno | |
312 | */ | |
313 | ||
314 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
315 | { | |
feaa7bba | 316 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa | 317 | struct buffer_head *dibh; |
cd915493 | 318 | u32 nlink; |
b3b94faa DT |
319 | int error; |
320 | ||
29937ac6 | 321 | BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); |
b3b94faa DT |
322 | nlink = ip->i_di.di_nlink + diff; |
323 | ||
324 | /* If we are reducing the nlink count, but the new value ends up being | |
325 | bigger than the old one, we must have underflowed. */ | |
326 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
327 | if (gfs2_consist_inode(ip)) | |
328 | gfs2_dinode_print(&ip->i_di); | |
329 | return -EIO; | |
330 | } | |
331 | ||
332 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
333 | if (error) | |
334 | return error; | |
335 | ||
336 | ip->i_di.di_nlink = nlink; | |
337 | ip->i_di.di_ctime = get_seconds(); | |
29937ac6 | 338 | ip->i_inode.i_nlink = nlink; |
b3b94faa | 339 | |
d4e9c4c3 | 340 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
341 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
342 | brelse(dibh); | |
feaa7bba | 343 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 344 | |
feaa7bba SW |
345 | if (ip->i_di.di_nlink == 0) { |
346 | struct gfs2_rgrpd *rgd; | |
347 | struct gfs2_holder ri_gh, rg_gh; | |
348 | ||
349 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
350 | if (error) | |
351 | goto out; | |
352 | error = -EIO; | |
353 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
354 | if (!rgd) | |
355 | goto out_norgrp; | |
356 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
357 | if (error) | |
358 | goto out_norgrp; | |
359 | ||
f92a0b6f | 360 | clear_nlink(&ip->i_inode); |
feaa7bba SW |
361 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
362 | gfs2_glock_dq_uninit(&rg_gh); | |
363 | out_norgrp: | |
364 | gfs2_glock_dq_uninit(&ri_gh); | |
365 | } | |
366 | out: | |
367 | return error; | |
b3b94faa DT |
368 | } |
369 | ||
c752666c SW |
370 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
371 | { | |
372 | struct qstr qstr; | |
71b86f56 | 373 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
374 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
375 | } | |
376 | ||
377 | ||
b3b94faa DT |
378 | /** |
379 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
380 | * @d_gh: An initialized holder for the directory glock | |
381 | * @name: The name of the inode to look for | |
382 | * @is_root: If 1, ignore the caller's permissions | |
383 | * @i_gh: An uninitialized holder for the new inode glock | |
384 | * | |
385 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
386 | * @is_root is true. | |
387 | * | |
388 | * Returns: errno | |
389 | */ | |
390 | ||
feaa7bba SW |
391 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
392 | int is_root, struct nameidata *nd) | |
b3b94faa | 393 | { |
c9fd4307 | 394 | struct super_block *sb = dir->i_sb; |
feaa7bba | 395 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa DT |
396 | struct gfs2_holder d_gh; |
397 | struct gfs2_inum inum; | |
398 | unsigned int type; | |
7359a19c | 399 | int error = 0; |
c752666c | 400 | struct inode *inode = NULL; |
b3b94faa DT |
401 | |
402 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 403 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 404 | |
c752666c SW |
405 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
406 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
407 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
408 | igrab(dir); |
409 | return dir; | |
b3b94faa DT |
410 | } |
411 | ||
412 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
413 | if (error) | |
c752666c | 414 | return ERR_PTR(error); |
b3b94faa DT |
415 | |
416 | if (!is_root) { | |
faf450ef | 417 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
418 | if (error) |
419 | goto out; | |
420 | } | |
421 | ||
c752666c | 422 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
423 | if (error) |
424 | goto out; | |
425 | ||
feaa7bba | 426 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 427 | |
7359a19c | 428 | out: |
b3b94faa | 429 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
430 | if (error == -ENOENT) |
431 | return NULL; | |
feaa7bba | 432 | return inode; |
b3b94faa DT |
433 | } |
434 | ||
cd915493 | 435 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 436 | { |
feaa7bba | 437 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa DT |
438 | struct buffer_head *bh; |
439 | struct gfs2_inum_range ir; | |
440 | int error; | |
441 | ||
442 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
443 | if (error) | |
444 | return error; | |
f55ab26a | 445 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
446 | |
447 | error = gfs2_meta_inode_buffer(ip, &bh); | |
448 | if (error) { | |
f55ab26a | 449 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
450 | gfs2_trans_end(sdp); |
451 | return error; | |
452 | } | |
453 | ||
454 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
455 | ||
456 | if (ir.ir_length) { | |
457 | *formal_ino = ir.ir_start++; | |
458 | ir.ir_length--; | |
d4e9c4c3 | 459 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
460 | gfs2_inum_range_out(&ir, |
461 | bh->b_data + sizeof(struct gfs2_dinode)); | |
462 | brelse(bh); | |
f55ab26a | 463 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
464 | gfs2_trans_end(sdp); |
465 | return 0; | |
466 | } | |
467 | ||
468 | brelse(bh); | |
469 | ||
f55ab26a | 470 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
471 | gfs2_trans_end(sdp); |
472 | ||
473 | return 1; | |
474 | } | |
475 | ||
cd915493 | 476 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 477 | { |
feaa7bba SW |
478 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
479 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
480 | struct gfs2_holder gh; |
481 | struct buffer_head *bh; | |
482 | struct gfs2_inum_range ir; | |
483 | int error; | |
484 | ||
485 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
486 | if (error) | |
487 | return error; | |
488 | ||
489 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
490 | if (error) | |
491 | goto out; | |
f55ab26a | 492 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
493 | |
494 | error = gfs2_meta_inode_buffer(ip, &bh); | |
495 | if (error) | |
496 | goto out_end_trans; | |
907b9bce | 497 | |
b3b94faa DT |
498 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
499 | ||
500 | if (!ir.ir_length) { | |
501 | struct buffer_head *m_bh; | |
cd915493 | 502 | u64 x, y; |
b3b94faa DT |
503 | |
504 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
505 | if (error) | |
506 | goto out_brelse; | |
507 | ||
cd915493 | 508 | x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
509 | x = y = be64_to_cpu(x); |
510 | ir.ir_start = x; | |
511 | ir.ir_length = GFS2_INUM_QUANTUM; | |
512 | x += GFS2_INUM_QUANTUM; | |
513 | if (x < y) | |
514 | gfs2_consist_inode(m_ip); | |
515 | x = cpu_to_be64(x); | |
d4e9c4c3 | 516 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
cd915493 | 517 | *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; |
b3b94faa DT |
518 | |
519 | brelse(m_bh); | |
520 | } | |
521 | ||
522 | *formal_ino = ir.ir_start++; | |
523 | ir.ir_length--; | |
524 | ||
d4e9c4c3 | 525 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
526 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
527 | ||
420b9e5e | 528 | out_brelse: |
b3b94faa | 529 | brelse(bh); |
420b9e5e | 530 | out_end_trans: |
f55ab26a | 531 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 532 | gfs2_trans_end(sdp); |
420b9e5e | 533 | out: |
b3b94faa | 534 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
535 | return error; |
536 | } | |
537 | ||
cd915493 | 538 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
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 | ||
cd915493 | 584 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 585 | return -EFBIG; |
cd915493 | 586 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1) |
b3b94faa DT |
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 && |
420b9e5e | 596 | (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) { |
b3b94faa DT |
597 | if (S_ISDIR(*mode)) |
598 | *mode |= S_ISUID; | |
599 | else if (dip->i_di.di_uid != current->fsuid) | |
600 | *mode &= ~07111; | |
601 | *uid = dip->i_di.di_uid; | |
602 | } else | |
603 | *uid = current->fsuid; | |
604 | ||
605 | if (dip->i_di.di_mode & S_ISGID) { | |
606 | if (S_ISDIR(*mode)) | |
607 | *mode |= S_ISGID; | |
608 | *gid = dip->i_di.di_gid; | |
609 | } else | |
610 | *gid = current->fsgid; | |
611 | } | |
612 | ||
4340fe62 SW |
613 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum, |
614 | u64 *generation) | |
b3b94faa | 615 | { |
feaa7bba | 616 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
617 | int error; |
618 | ||
619 | gfs2_alloc_get(dip); | |
620 | ||
621 | dip->i_alloc.al_requested = RES_DINODE; | |
622 | error = gfs2_inplace_reserve(dip); | |
623 | if (error) | |
624 | goto out; | |
625 | ||
feaa7bba | 626 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
627 | if (error) |
628 | goto out_ipreserv; | |
629 | ||
4340fe62 | 630 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
631 | |
632 | gfs2_trans_end(sdp); | |
633 | ||
4340fe62 | 634 | out_ipreserv: |
b3b94faa | 635 | gfs2_inplace_release(dip); |
4340fe62 | 636 | out: |
b3b94faa | 637 | gfs2_alloc_put(dip); |
b3b94faa DT |
638 | return error; |
639 | } | |
640 | ||
641 | /** | |
642 | * init_dinode - Fill in a new dinode structure | |
643 | * @dip: the directory this inode is being created in | |
644 | * @gl: The glock covering the new inode | |
645 | * @inum: the inode number | |
646 | * @mode: the file permissions | |
647 | * @uid: | |
648 | * @gid: | |
649 | * | |
650 | */ | |
651 | ||
652 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
653 | const struct gfs2_inum *inum, unsigned int mode, |
654 | unsigned int uid, unsigned int gid, | |
655 | const u64 *generation) | |
b3b94faa | 656 | { |
feaa7bba | 657 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 658 | struct gfs2_dinode *di; |
b3b94faa DT |
659 | struct buffer_head *dibh; |
660 | ||
661 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 662 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
663 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
664 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
665 | di = (struct gfs2_dinode *)dibh->b_data; |
666 | ||
2442a098 SW |
667 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
668 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
669 | di->di_mode = cpu_to_be32(mode); |
670 | di->di_uid = cpu_to_be32(uid); | |
671 | di->di_gid = cpu_to_be32(gid); | |
672 | di->di_nlink = cpu_to_be32(0); | |
673 | di->di_size = cpu_to_be64(0); | |
674 | di->di_blocks = cpu_to_be64(1); | |
675 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
676 | di->di_major = di->di_minor = cpu_to_be32(0); | |
677 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
4340fe62 | 678 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 679 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
680 | |
681 | if (S_ISREG(mode)) { | |
682 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
683 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 684 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
685 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
686 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 687 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 688 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
689 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
690 | GFS2_DIF_INHERIT_DIRECTIO); | |
691 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
692 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
693 | } |
694 | ||
b96ca4fa | 695 | di->__pad1 = 0; |
b2a580d8 | 696 | di->di_payload_format = cpu_to_be32(0); |
b96ca4fa SW |
697 | di->di_height = cpu_to_be32(0); |
698 | di->__pad2 = 0; | |
699 | di->__pad3 = 0; | |
700 | di->di_depth = cpu_to_be16(0); | |
701 | di->di_entries = cpu_to_be32(0); | |
702 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
703 | di->di_eattr = cpu_to_be64(0); | |
704 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
705 | ||
b3b94faa DT |
706 | brelse(dibh); |
707 | } | |
708 | ||
709 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
4340fe62 SW |
710 | unsigned int mode, const struct gfs2_inum *inum, |
711 | const u64 *generation) | |
b3b94faa | 712 | { |
feaa7bba | 713 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
714 | unsigned int uid, gid; |
715 | int error; | |
716 | ||
717 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
718 | gfs2_alloc_get(dip); |
719 | ||
720 | error = gfs2_quota_lock(dip, uid, gid); | |
721 | if (error) | |
722 | goto out; | |
723 | ||
724 | error = gfs2_quota_check(dip, uid, gid); | |
725 | if (error) | |
726 | goto out_quota; | |
727 | ||
feaa7bba | 728 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
729 | if (error) |
730 | goto out_quota; | |
731 | ||
4340fe62 | 732 | init_dinode(dip, gl, inum, mode, uid, gid, generation); |
b3b94faa | 733 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
734 | gfs2_trans_end(sdp); |
735 | ||
feaa7bba | 736 | out_quota: |
b3b94faa | 737 | gfs2_quota_unlock(dip); |
feaa7bba | 738 | out: |
b3b94faa | 739 | gfs2_alloc_put(dip); |
b3b94faa DT |
740 | return error; |
741 | } | |
742 | ||
feaa7bba SW |
743 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
744 | struct gfs2_inode *ip) | |
b3b94faa | 745 | { |
feaa7bba | 746 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
747 | struct gfs2_alloc *al; |
748 | int alloc_required; | |
749 | struct buffer_head *dibh; | |
750 | int error; | |
751 | ||
752 | al = gfs2_alloc_get(dip); | |
753 | ||
754 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
755 | if (error) | |
756 | goto fail; | |
757 | ||
feaa7bba | 758 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
759 | if (alloc_required < 0) |
760 | goto fail; | |
b3b94faa DT |
761 | if (alloc_required) { |
762 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
763 | dip->i_di.di_gid); | |
764 | if (error) | |
765 | goto fail_quota_locks; | |
766 | ||
767 | al->al_requested = sdp->sd_max_dirres; | |
768 | ||
769 | error = gfs2_inplace_reserve(dip); | |
770 | if (error) | |
771 | goto fail_quota_locks; | |
772 | ||
320dd101 | 773 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 774 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 775 | 2 * RES_DINODE + |
b3b94faa DT |
776 | RES_STATFS + RES_QUOTA, 0); |
777 | if (error) | |
778 | goto fail_ipreserv; | |
779 | } else { | |
feaa7bba | 780 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
781 | if (error) |
782 | goto fail_quota_locks; | |
783 | } | |
784 | ||
feaa7bba | 785 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
786 | if (error) |
787 | goto fail_end_trans; | |
788 | ||
789 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
790 | if (error) | |
791 | goto fail_end_trans; | |
792 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 793 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
794 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
795 | brelse(dibh); | |
b3b94faa DT |
796 | return 0; |
797 | ||
320dd101 | 798 | fail_end_trans: |
b3b94faa DT |
799 | gfs2_trans_end(sdp); |
800 | ||
320dd101 | 801 | fail_ipreserv: |
b3b94faa DT |
802 | if (dip->i_alloc.al_rgd) |
803 | gfs2_inplace_release(dip); | |
804 | ||
320dd101 | 805 | fail_quota_locks: |
b3b94faa DT |
806 | gfs2_quota_unlock(dip); |
807 | ||
320dd101 | 808 | fail: |
b3b94faa | 809 | gfs2_alloc_put(dip); |
b3b94faa DT |
810 | return error; |
811 | } | |
812 | ||
fcb47e0b RH |
813 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
814 | { | |
815 | int err; | |
816 | size_t len; | |
817 | void *value; | |
818 | char *name; | |
819 | struct gfs2_ea_request er; | |
820 | ||
821 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
822 | &name, &value, &len); | |
823 | ||
824 | if (err) { | |
825 | if (err == -EOPNOTSUPP) | |
826 | return 0; | |
827 | return err; | |
828 | } | |
829 | ||
830 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
831 | ||
832 | er.er_type = GFS2_EATYPE_SECURITY; | |
833 | er.er_name = name; | |
834 | er.er_data = value; | |
835 | er.er_name_len = strlen(name); | |
836 | er.er_data_len = len; | |
837 | ||
838 | err = gfs2_ea_set_i(ip, &er); | |
839 | ||
840 | kfree(value); | |
841 | kfree(name); | |
842 | ||
843 | return err; | |
844 | } | |
845 | ||
b3b94faa DT |
846 | /** |
847 | * gfs2_createi - Create a new inode | |
848 | * @ghs: An array of two holders | |
849 | * @name: The name of the new file | |
850 | * @mode: the permissions on the new inode | |
851 | * | |
852 | * @ghs[0] is an initialized holder for the directory | |
853 | * @ghs[1] is the holder for the inode lock | |
854 | * | |
7359a19c | 855 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
856 | * file are held. A transaction has been started and an inplace reservation |
857 | * is held, as well. | |
858 | * | |
7359a19c | 859 | * Returns: An inode |
b3b94faa DT |
860 | */ |
861 | ||
feaa7bba | 862 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
568f4c96 | 863 | unsigned int mode) |
b3b94faa | 864 | { |
7359a19c | 865 | struct inode *inode; |
5c676f6d | 866 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
867 | struct inode *dir = &dip->i_inode; |
868 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
869 | struct gfs2_inum inum; | |
b3b94faa | 870 | int error; |
4340fe62 | 871 | u64 generation; |
b3b94faa DT |
872 | |
873 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 874 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 875 | |
b3b94faa DT |
876 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
877 | error = gfs2_glock_nq(ghs); | |
878 | if (error) | |
879 | goto fail; | |
880 | ||
881 | error = create_ok(dip, name, mode); | |
882 | if (error) | |
883 | goto fail_gunlock; | |
884 | ||
feaa7bba | 885 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
886 | if (error) |
887 | goto fail_gunlock; | |
888 | ||
4340fe62 | 889 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
890 | if (error) |
891 | goto fail_gunlock; | |
892 | ||
feaa7bba | 893 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
894 | gfs2_glock_dq(ghs); |
895 | ||
feaa7bba | 896 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
897 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
898 | GL_SKIP, ghs + 1); | |
b3b94faa | 899 | if (error) { |
7359a19c | 900 | return ERR_PTR(error); |
b3b94faa DT |
901 | } |
902 | ||
903 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
904 | error = gfs2_glock_nq(ghs); | |
905 | if (error) { | |
906 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 907 | return ERR_PTR(error); |
b3b94faa DT |
908 | } |
909 | ||
910 | error = create_ok(dip, name, mode); | |
911 | if (error) | |
912 | goto fail_gunlock2; | |
913 | } else { | |
feaa7bba | 914 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
915 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
916 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
917 | if (error) |
918 | goto fail_gunlock; | |
919 | } | |
920 | ||
4340fe62 | 921 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); |
b3b94faa DT |
922 | if (error) |
923 | goto fail_gunlock2; | |
924 | ||
feaa7bba SW |
925 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
926 | if (IS_ERR(inode)) | |
b3b94faa DT |
927 | goto fail_gunlock2; |
928 | ||
feaa7bba | 929 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
930 | if (error) |
931 | goto fail_iput; | |
932 | ||
feaa7bba | 933 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
934 | if (error) |
935 | goto fail_iput; | |
936 | ||
fcb47e0b RH |
937 | error = gfs2_security_init(dip, GFS2_I(inode)); |
938 | if (error) | |
939 | goto fail_iput; | |
940 | ||
feaa7bba | 941 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
942 | if (error) |
943 | goto fail_iput; | |
944 | ||
7359a19c SW |
945 | if (!inode) |
946 | return ERR_PTR(-ENOMEM); | |
947 | return inode; | |
b3b94faa | 948 | |
320dd101 | 949 | fail_iput: |
feaa7bba | 950 | iput(inode); |
320dd101 | 951 | fail_gunlock2: |
b3b94faa | 952 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 953 | fail_gunlock: |
b3b94faa | 954 | gfs2_glock_dq(ghs); |
320dd101 | 955 | fail: |
7359a19c | 956 | return ERR_PTR(error); |
b3b94faa DT |
957 | } |
958 | ||
b3b94faa DT |
959 | /** |
960 | * gfs2_rmdiri - Remove a directory | |
961 | * @dip: The parent directory of the directory to be removed | |
962 | * @name: The name of the directory to be removed | |
963 | * @ip: The GFS2 inode of the directory to be removed | |
964 | * | |
965 | * Assumes Glocks on dip and ip are held | |
966 | * | |
967 | * Returns: errno | |
968 | */ | |
969 | ||
feaa7bba SW |
970 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
971 | struct gfs2_inode *ip) | |
b3b94faa | 972 | { |
b3b94faa DT |
973 | struct qstr dotname; |
974 | int error; | |
975 | ||
976 | if (ip->i_di.di_entries != 2) { | |
977 | if (gfs2_consist_inode(ip)) | |
978 | gfs2_dinode_print(&ip->i_di); | |
979 | return -EIO; | |
980 | } | |
981 | ||
982 | error = gfs2_dir_del(dip, name); | |
983 | if (error) | |
984 | return error; | |
985 | ||
986 | error = gfs2_change_nlink(dip, -1); | |
987 | if (error) | |
988 | return error; | |
989 | ||
71b86f56 | 990 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
991 | error = gfs2_dir_del(ip, &dotname); |
992 | if (error) | |
993 | return error; | |
994 | ||
feaa7bba | 995 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
996 | error = gfs2_dir_del(ip, &dotname); |
997 | if (error) | |
998 | return error; | |
999 | ||
1000 | error = gfs2_change_nlink(ip, -2); | |
1001 | if (error) | |
1002 | return error; | |
1003 | ||
b3b94faa DT |
1004 | return error; |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1009 | * @dip: the directory | |
1010 | * @name: the name of the file | |
1011 | * @ip: the inode | |
1012 | * | |
1013 | * Assumes that the lock on (at least) @dip is held. | |
1014 | * | |
1015 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1016 | */ | |
1017 | ||
feaa7bba | 1018 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1019 | struct gfs2_inode *ip) |
1020 | { | |
1021 | struct gfs2_inum inum; | |
1022 | unsigned int type; | |
1023 | int error; | |
1024 | ||
feaa7bba | 1025 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1026 | return -EPERM; |
1027 | ||
1028 | if ((dip->i_di.di_mode & S_ISVTX) && | |
1029 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 1030 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
1031 | return -EPERM; |
1032 | ||
feaa7bba | 1033 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1034 | return -EPERM; |
1035 | ||
faf450ef | 1036 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1037 | if (error) |
1038 | return error; | |
1039 | ||
feaa7bba | 1040 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1041 | if (error) |
1042 | return error; | |
1043 | ||
1044 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1045 | return -ENOENT; | |
1046 | ||
1047 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1048 | gfs2_consist_inode(dip); | |
1049 | return -EIO; | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1057 | * @this: move this | |
1058 | * @to: to here | |
1059 | * | |
1060 | * Follow @to back to the root and make sure we don't encounter @this | |
1061 | * Assumes we already hold the rename lock. | |
1062 | * | |
1063 | * Returns: errno | |
1064 | */ | |
1065 | ||
1066 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1067 | { | |
feaa7bba | 1068 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1069 | struct super_block *sb = dir->i_sb; |
7359a19c | 1070 | struct inode *tmp; |
b3b94faa DT |
1071 | struct qstr dotdot; |
1072 | int error = 0; | |
1073 | ||
71b86f56 | 1074 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1075 | |
7359a19c | 1076 | igrab(dir); |
b3b94faa DT |
1077 | |
1078 | for (;;) { | |
feaa7bba | 1079 | if (dir == &this->i_inode) { |
b3b94faa DT |
1080 | error = -EINVAL; |
1081 | break; | |
1082 | } | |
c9fd4307 | 1083 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1084 | error = 0; |
1085 | break; | |
1086 | } | |
1087 | ||
c752666c SW |
1088 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1089 | if (IS_ERR(tmp)) { | |
1090 | error = PTR_ERR(tmp); | |
b3b94faa | 1091 | break; |
c752666c | 1092 | } |
b3b94faa | 1093 | |
7359a19c SW |
1094 | iput(dir); |
1095 | dir = tmp; | |
b3b94faa DT |
1096 | } |
1097 | ||
7359a19c | 1098 | iput(dir); |
b3b94faa DT |
1099 | |
1100 | return error; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * gfs2_readlinki - return the contents of a symlink | |
1105 | * @ip: the symlink's inode | |
1106 | * @buf: a pointer to the buffer to be filled | |
1107 | * @len: a pointer to the length of @buf | |
1108 | * | |
1109 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1110 | * to be freed by the caller. | |
1111 | * | |
1112 | * Returns: errno | |
1113 | */ | |
1114 | ||
1115 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1116 | { | |
1117 | struct gfs2_holder i_gh; | |
1118 | struct buffer_head *dibh; | |
1119 | unsigned int x; | |
1120 | int error; | |
1121 | ||
1122 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1123 | error = gfs2_glock_nq_atime(&i_gh); | |
1124 | if (error) { | |
1125 | gfs2_holder_uninit(&i_gh); | |
1126 | return error; | |
1127 | } | |
1128 | ||
1129 | if (!ip->i_di.di_size) { | |
1130 | gfs2_consist_inode(ip); | |
1131 | error = -EIO; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1136 | if (error) | |
1137 | goto out; | |
1138 | ||
1139 | x = ip->i_di.di_size + 1; | |
1140 | if (x > *len) { | |
1141 | *buf = kmalloc(x, GFP_KERNEL); | |
1142 | if (!*buf) { | |
1143 | error = -ENOMEM; | |
1144 | goto out_brelse; | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1149 | *len = x; | |
1150 | ||
feaa7bba | 1151 | out_brelse: |
b3b94faa | 1152 | brelse(dibh); |
feaa7bba | 1153 | out: |
b3b94faa | 1154 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1155 | return error; |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1160 | * conditionally update the inode's atime | |
1161 | * @gh: the holder to acquire | |
1162 | * | |
1163 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1164 | * Update if the difference between the current time and the inode's current | |
1165 | * atime is greater than an interval specified at mount. | |
1166 | * | |
1167 | * Returns: errno | |
1168 | */ | |
1169 | ||
1170 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1171 | { | |
1172 | struct gfs2_glock *gl = gh->gh_gl; | |
1173 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1174 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1175 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1176 | unsigned int state; |
1177 | int flags; | |
1178 | int error; | |
1179 | ||
1180 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1181 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1182 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1183 | return -EINVAL; | |
1184 | ||
1185 | state = gh->gh_state; | |
1186 | flags = gh->gh_flags; | |
1187 | ||
1188 | error = gfs2_glock_nq(gh); | |
1189 | if (error) | |
1190 | return error; | |
1191 | ||
1192 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1193 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1194 | return 0; | |
1195 | ||
1196 | curtime = get_seconds(); | |
1197 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1198 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1199 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1200 | gh); | |
b3b94faa DT |
1201 | error = gfs2_glock_nq(gh); |
1202 | if (error) | |
1203 | return error; | |
1204 | ||
1205 | /* Verify that atime hasn't been updated while we were | |
1206 | trying to get exclusive lock. */ | |
1207 | ||
1208 | curtime = get_seconds(); | |
1209 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1210 | struct buffer_head *dibh; | |
48516ced | 1211 | struct gfs2_dinode *di; |
b3b94faa DT |
1212 | |
1213 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1214 | if (error == -EROFS) | |
1215 | return 0; | |
1216 | if (error) | |
1217 | goto fail; | |
1218 | ||
1219 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1220 | if (error) | |
1221 | goto fail_end_trans; | |
1222 | ||
1223 | ip->i_di.di_atime = curtime; | |
1224 | ||
d4e9c4c3 | 1225 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced SW |
1226 | di = (struct gfs2_dinode *)dibh->b_data; |
1227 | di->di_atime = cpu_to_be64(ip->i_di.di_atime); | |
b3b94faa DT |
1228 | brelse(dibh); |
1229 | ||
1230 | gfs2_trans_end(sdp); | |
1231 | } | |
1232 | ||
1233 | /* If someone else has asked for the glock, | |
1234 | unlock and let them have it. Then reacquire | |
1235 | in the original state. */ | |
1236 | if (gfs2_glock_is_blocking(gl)) { | |
1237 | gfs2_glock_dq(gh); | |
1238 | gfs2_holder_reinit(state, flags, gh); | |
1239 | return gfs2_glock_nq(gh); | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | return 0; | |
1244 | ||
feaa7bba | 1245 | fail_end_trans: |
b3b94faa | 1246 | gfs2_trans_end(sdp); |
feaa7bba | 1247 | fail: |
b3b94faa | 1248 | gfs2_glock_dq(gh); |
b3b94faa DT |
1249 | return error; |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1254 | * @arg_a: the first structure | |
1255 | * @arg_b: the second structure | |
1256 | * | |
1257 | * Returns: 1 if A > B | |
1258 | * -1 if A < B | |
75d3b817 | 1259 | * 0 if A == B |
b3b94faa DT |
1260 | */ |
1261 | ||
1262 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1263 | { | |
75d3b817 SW |
1264 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1265 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1266 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1267 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1268 | |
1269 | if (a->ln_number > b->ln_number) | |
75d3b817 SW |
1270 | return 1; |
1271 | if (a->ln_number < b->ln_number) | |
1272 | return -1; | |
1273 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1274 | return 1; | |
1275 | if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) | |
1276 | return 1; | |
b3b94faa | 1277 | |
75d3b817 | 1278 | return 0; |
b3b94faa DT |
1279 | } |
1280 | ||
1281 | /** | |
1282 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1283 | * atime update | |
1284 | * @num_gh: the number of structures | |
1285 | * @ghs: an array of struct gfs2_holder structures | |
1286 | * | |
1287 | * Returns: 0 on success (all glocks acquired), | |
1288 | * errno on failure (no glocks acquired) | |
1289 | */ | |
1290 | ||
1291 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1292 | { | |
1293 | struct gfs2_holder **p; | |
1294 | unsigned int x; | |
1295 | int error = 0; | |
1296 | ||
1297 | if (!num_gh) | |
1298 | return 0; | |
1299 | ||
1300 | if (num_gh == 1) { | |
1301 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1302 | if (ghs->gh_flags & GL_ATIME) | |
1303 | error = gfs2_glock_nq_atime(ghs); | |
1304 | else | |
1305 | error = gfs2_glock_nq(ghs); | |
1306 | return error; | |
1307 | } | |
1308 | ||
1309 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1310 | if (!p) | |
1311 | return -ENOMEM; | |
1312 | ||
1313 | for (x = 0; x < num_gh; x++) | |
1314 | p[x] = &ghs[x]; | |
1315 | ||
1316 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1317 | ||
1318 | for (x = 0; x < num_gh; x++) { | |
1319 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1320 | ||
1321 | if (p[x]->gh_flags & GL_ATIME) | |
1322 | error = gfs2_glock_nq_atime(p[x]); | |
1323 | else | |
1324 | error = gfs2_glock_nq(p[x]); | |
1325 | ||
1326 | if (error) { | |
1327 | while (x--) | |
1328 | gfs2_glock_dq(p[x]); | |
1329 | break; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | kfree(p); | |
b3b94faa DT |
1334 | return error; |
1335 | } | |
1336 | ||
b3b94faa DT |
1337 | |
1338 | static int | |
1339 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1340 | { | |
1341 | struct buffer_head *dibh; | |
1342 | int error; | |
1343 | ||
1344 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1345 | if (!error) { | |
feaa7bba SW |
1346 | error = inode_setattr(&ip->i_inode, attr); |
1347 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1348 | gfs2_inode_attr_out(ip); |
1349 | ||
d4e9c4c3 | 1350 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1351 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1352 | brelse(dibh); | |
1353 | } | |
1354 | return error; | |
1355 | } | |
1356 | ||
1357 | /** | |
1358 | * gfs2_setattr_simple - | |
1359 | * @ip: | |
1360 | * @attr: | |
1361 | * | |
1362 | * Called with a reference on the vnode. | |
1363 | * | |
1364 | * Returns: errno | |
1365 | */ | |
1366 | ||
1367 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1368 | { | |
1369 | int error; | |
1370 | ||
5c676f6d | 1371 | if (current->journal_info) |
b3b94faa DT |
1372 | return __gfs2_setattr_simple(ip, attr); |
1373 | ||
feaa7bba | 1374 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1375 | if (error) |
1376 | return error; | |
1377 | ||
1378 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1379 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1380 | return error; |
1381 | } | |
1382 |