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; | |
c2668711 | 54 | i_size_write(inode, di->di_size); |
c2668711 | 55 | inode->i_blocks = di->di_blocks << |
feaa7bba | 56 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa | 57 | |
c2668711 | 58 | if (di->di_flags & GFS2_DIF_IMMUTABLE) |
b3b94faa DT |
59 | inode->i_flags |= S_IMMUTABLE; |
60 | else | |
61 | inode->i_flags &= ~S_IMMUTABLE; | |
62 | ||
c2668711 | 63 | if (di->di_flags & GFS2_DIF_APPENDONLY) |
b3b94faa DT |
64 | inode->i_flags |= S_APPEND; |
65 | else | |
66 | inode->i_flags &= ~S_APPEND; | |
67 | } | |
68 | ||
feaa7bba SW |
69 | static int iget_test(struct inode *inode, void *opaque) |
70 | { | |
71 | struct gfs2_inode *ip = GFS2_I(inode); | |
629a21e7 | 72 | struct gfs2_inum_host *inum = opaque; |
feaa7bba SW |
73 | |
74 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
75 | return 1; | |
b3b94faa | 76 | |
feaa7bba SW |
77 | return 0; |
78 | } | |
79 | ||
80 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 81 | { |
feaa7bba | 82 | struct gfs2_inode *ip = GFS2_I(inode); |
629a21e7 | 83 | struct gfs2_inum_host *inum = opaque; |
b3b94faa | 84 | |
feaa7bba SW |
85 | ip->i_num = *inum; |
86 | return 0; | |
87 | } | |
b3b94faa | 88 | |
629a21e7 | 89 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
90 | { |
91 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
92 | iget_test, inum); | |
93 | } | |
b3b94faa | 94 | |
629a21e7 | 95 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
96 | { |
97 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
98 | iget_test, iget_set, inum); | |
b3b94faa DT |
99 | } |
100 | ||
101 | /** | |
feaa7bba SW |
102 | * gfs2_inode_lookup - Lookup an inode |
103 | * @sb: The super block | |
104 | * @inum: The inode number | |
105 | * @type: The type of the inode | |
b3b94faa | 106 | * |
feaa7bba | 107 | * Returns: A VFS inode, or an error |
b3b94faa DT |
108 | */ |
109 | ||
629a21e7 | 110 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
b3b94faa | 111 | { |
feaa7bba SW |
112 | struct inode *inode = gfs2_iget(sb, inum); |
113 | struct gfs2_inode *ip = GFS2_I(inode); | |
114 | struct gfs2_glock *io_gl; | |
115 | int error; | |
b3b94faa | 116 | |
26d83ded SW |
117 | if (!inode) |
118 | return ERR_PTR(-ENOBUFS); | |
119 | ||
feaa7bba SW |
120 | if (inode->i_state & I_NEW) { |
121 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
122 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 123 | inode->i_private = ip; |
feaa7bba SW |
124 | inode->i_mode = mode; |
125 | ||
126 | if (S_ISREG(mode)) { | |
127 | inode->i_op = &gfs2_file_iops; | |
128 | inode->i_fop = &gfs2_file_fops; | |
129 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
130 | } else if (S_ISDIR(mode)) { | |
131 | inode->i_op = &gfs2_dir_iops; | |
132 | inode->i_fop = &gfs2_dir_fops; | |
133 | } else if (S_ISLNK(mode)) { | |
134 | inode->i_op = &gfs2_symlink_iops; | |
135 | } else { | |
136 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 137 | } |
b3b94faa | 138 | |
feaa7bba SW |
139 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
140 | if (unlikely(error)) | |
141 | goto fail; | |
142 | ip->i_gl->gl_object = ip; | |
b3b94faa | 143 | |
feaa7bba SW |
144 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
145 | if (unlikely(error)) | |
146 | goto fail_put; | |
b3b94faa | 147 | |
bfded27b | 148 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
149 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
150 | if (unlikely(error)) | |
151 | goto fail_iopen; | |
b3b94faa | 152 | |
feaa7bba SW |
153 | gfs2_glock_put(io_gl); |
154 | unlock_new_inode(inode); | |
155 | } | |
b3b94faa DT |
156 | |
157 | return inode; | |
feaa7bba SW |
158 | fail_iopen: |
159 | gfs2_glock_put(io_gl); | |
160 | fail_put: | |
161 | ip->i_gl->gl_object = NULL; | |
162 | gfs2_glock_put(ip->i_gl); | |
163 | fail: | |
164 | iput(inode); | |
165 | return ERR_PTR(error); | |
b3b94faa DT |
166 | } |
167 | ||
af339c02 | 168 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
169 | { |
170 | struct gfs2_dinode_host *di = &ip->i_di; | |
171 | const struct gfs2_dinode *str = buf; | |
172 | ||
af339c02 SW |
173 | if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { |
174 | if (gfs2_consist_inode(ip)) | |
175 | gfs2_dinode_print(ip); | |
176 | return -EIO; | |
177 | } | |
178 | if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) | |
179 | return -ESTALE; | |
ea744d01 | 180 | |
b60623c2 | 181 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 182 | ip->i_inode.i_rdev = 0; |
b60623c2 | 183 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
184 | case S_IFBLK: |
185 | case S_IFCHR: | |
186 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
187 | be32_to_cpu(str->di_minor)); | |
188 | break; | |
189 | }; | |
190 | ||
2933f925 SW |
191 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
192 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
193 | /* |
194 | * We will need to review setting the nlink count here in the | |
195 | * light of the forthcoming ro bind mount work. This is a reminder | |
196 | * to do that. | |
197 | */ | |
198 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 SW |
199 | di->di_size = be64_to_cpu(str->di_size); |
200 | di->di_blocks = be64_to_cpu(str->di_blocks); | |
1a7b1eed SW |
201 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
202 | ip->i_inode.i_atime.tv_nsec = 0; | |
203 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); | |
204 | ip->i_inode.i_mtime.tv_nsec = 0; | |
205 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); | |
206 | ip->i_inode.i_ctime.tv_nsec = 0; | |
ea744d01 SW |
207 | |
208 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
209 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
210 | di->di_generation = be64_to_cpu(str->di_generation); | |
211 | ||
212 | di->di_flags = be32_to_cpu(str->di_flags); | |
ea744d01 SW |
213 | di->di_height = be16_to_cpu(str->di_height); |
214 | ||
215 | di->di_depth = be16_to_cpu(str->di_depth); | |
216 | di->di_entries = be32_to_cpu(str->di_entries); | |
217 | ||
218 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 219 | return 0; |
ea744d01 SW |
220 | } |
221 | ||
b3b94faa DT |
222 | /** |
223 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
224 | * @ip: The GFS2 inode | |
225 | * | |
226 | * Returns: errno | |
227 | */ | |
228 | ||
229 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
230 | { | |
231 | struct buffer_head *dibh; | |
232 | int error; | |
233 | ||
234 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
235 | if (error) | |
236 | return error; | |
237 | ||
feaa7bba | 238 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
239 | brelse(dibh); |
240 | return -EIO; | |
241 | } | |
242 | ||
af339c02 | 243 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 244 | brelse(dibh); |
bfded27b | 245 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 246 | |
af339c02 | 247 | return error; |
b3b94faa DT |
248 | } |
249 | ||
feaa7bba | 250 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 251 | { |
feaa7bba | 252 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
253 | struct gfs2_alloc *al; |
254 | struct gfs2_rgrpd *rgd; | |
255 | int error; | |
256 | ||
257 | if (ip->i_di.di_blocks != 1) { | |
258 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 259 | gfs2_dinode_print(ip); |
b3b94faa DT |
260 | return -EIO; |
261 | } | |
262 | ||
263 | al = gfs2_alloc_get(ip); | |
264 | ||
265 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
266 | if (error) | |
267 | goto out; | |
268 | ||
269 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
270 | if (error) | |
271 | goto out_qs; | |
272 | ||
273 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
274 | if (!rgd) { | |
275 | gfs2_consist_inode(ip); | |
276 | error = -EIO; | |
277 | goto out_rindex_relse; | |
278 | } | |
279 | ||
280 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
281 | &al->al_rgd_gh); | |
282 | if (error) | |
283 | goto out_rindex_relse; | |
284 | ||
420b9e5e | 285 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
286 | if (error) |
287 | goto out_rg_gunlock; | |
288 | ||
289 | gfs2_trans_add_gl(ip->i_gl); | |
290 | ||
291 | gfs2_free_di(rgd, ip); | |
292 | ||
b3b94faa DT |
293 | gfs2_trans_end(sdp); |
294 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
295 | ||
feaa7bba | 296 | out_rg_gunlock: |
b3b94faa | 297 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 298 | out_rindex_relse: |
b3b94faa | 299 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 300 | out_qs: |
b3b94faa | 301 | gfs2_quota_unhold(ip); |
36327521 | 302 | out: |
feaa7bba | 303 | gfs2_alloc_put(ip); |
b3b94faa DT |
304 | return error; |
305 | } | |
306 | ||
b3b94faa DT |
307 | /** |
308 | * gfs2_change_nlink - Change nlink count on inode | |
309 | * @ip: The GFS2 inode | |
310 | * @diff: The change in the nlink count required | |
311 | * | |
312 | * Returns: errno | |
313 | */ | |
314 | ||
315 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
316 | { | |
feaa7bba | 317 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa | 318 | struct buffer_head *dibh; |
cd915493 | 319 | u32 nlink; |
b3b94faa DT |
320 | int error; |
321 | ||
4f56110a SW |
322 | BUG_ON(diff != 1 && diff != -1); |
323 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
324 | |
325 | /* If we are reducing the nlink count, but the new value ends up being | |
326 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 327 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 328 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 329 | gfs2_dinode_print(ip); |
b3b94faa DT |
330 | return -EIO; |
331 | } | |
332 | ||
333 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
334 | if (error) | |
335 | return error; | |
336 | ||
4f56110a SW |
337 | if (diff > 0) |
338 | inc_nlink(&ip->i_inode); | |
339 | else | |
340 | drop_nlink(&ip->i_inode); | |
341 | ||
1a7b1eed | 342 | ip->i_inode.i_ctime.tv_sec = get_seconds(); |
b3b94faa | 343 | |
d4e9c4c3 | 344 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 345 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 346 | brelse(dibh); |
feaa7bba | 347 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 348 | |
4f56110a | 349 | if (ip->i_inode.i_nlink == 0) { |
feaa7bba SW |
350 | struct gfs2_rgrpd *rgd; |
351 | struct gfs2_holder ri_gh, rg_gh; | |
352 | ||
353 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
354 | if (error) | |
355 | goto out; | |
356 | error = -EIO; | |
357 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
358 | if (!rgd) | |
359 | goto out_norgrp; | |
360 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
361 | if (error) | |
362 | goto out_norgrp; | |
363 | ||
364 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
365 | gfs2_glock_dq_uninit(&rg_gh); | |
366 | out_norgrp: | |
367 | gfs2_glock_dq_uninit(&ri_gh); | |
368 | } | |
369 | out: | |
370 | return error; | |
b3b94faa DT |
371 | } |
372 | ||
c752666c SW |
373 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
374 | { | |
375 | struct qstr qstr; | |
71b86f56 | 376 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
377 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
378 | } | |
379 | ||
380 | ||
b3b94faa DT |
381 | /** |
382 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
383 | * @d_gh: An initialized holder for the directory glock | |
384 | * @name: The name of the inode to look for | |
385 | * @is_root: If 1, ignore the caller's permissions | |
386 | * @i_gh: An uninitialized holder for the new inode glock | |
387 | * | |
388 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
389 | * @is_root is true. | |
390 | * | |
391 | * Returns: errno | |
392 | */ | |
393 | ||
feaa7bba SW |
394 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
395 | int is_root, struct nameidata *nd) | |
b3b94faa | 396 | { |
c9fd4307 | 397 | struct super_block *sb = dir->i_sb; |
feaa7bba | 398 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 399 | struct gfs2_holder d_gh; |
629a21e7 | 400 | struct gfs2_inum_host inum; |
b3b94faa | 401 | unsigned int type; |
7359a19c | 402 | int error = 0; |
c752666c | 403 | struct inode *inode = NULL; |
b3b94faa DT |
404 | |
405 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 406 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 407 | |
c752666c SW |
408 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
409 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
410 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
411 | igrab(dir); |
412 | return dir; | |
b3b94faa DT |
413 | } |
414 | ||
415 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
416 | if (error) | |
c752666c | 417 | return ERR_PTR(error); |
b3b94faa DT |
418 | |
419 | if (!is_root) { | |
faf450ef | 420 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
421 | if (error) |
422 | goto out; | |
423 | } | |
424 | ||
c752666c | 425 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
426 | if (error) |
427 | goto out; | |
428 | ||
feaa7bba | 429 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 430 | |
7359a19c | 431 | out: |
b3b94faa | 432 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
433 | if (error == -ENOENT) |
434 | return NULL; | |
feaa7bba | 435 | return inode; |
b3b94faa DT |
436 | } |
437 | ||
cd915493 | 438 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 439 | { |
feaa7bba | 440 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 441 | struct buffer_head *bh; |
e6972647 | 442 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
443 | int error; |
444 | ||
445 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
446 | if (error) | |
447 | return error; | |
f55ab26a | 448 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
449 | |
450 | error = gfs2_meta_inode_buffer(ip, &bh); | |
451 | if (error) { | |
f55ab26a | 452 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
453 | gfs2_trans_end(sdp); |
454 | return error; | |
455 | } | |
456 | ||
457 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
458 | ||
459 | if (ir.ir_length) { | |
460 | *formal_ino = ir.ir_start++; | |
461 | ir.ir_length--; | |
d4e9c4c3 | 462 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
463 | gfs2_inum_range_out(&ir, |
464 | bh->b_data + sizeof(struct gfs2_dinode)); | |
465 | brelse(bh); | |
f55ab26a | 466 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
467 | gfs2_trans_end(sdp); |
468 | return 0; | |
469 | } | |
470 | ||
471 | brelse(bh); | |
472 | ||
f55ab26a | 473 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
474 | gfs2_trans_end(sdp); |
475 | ||
476 | return 1; | |
477 | } | |
478 | ||
cd915493 | 479 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 480 | { |
feaa7bba SW |
481 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
482 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
483 | struct gfs2_holder gh; |
484 | struct buffer_head *bh; | |
e6972647 | 485 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
486 | int error; |
487 | ||
488 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
489 | if (error) | |
490 | return error; | |
491 | ||
492 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
493 | if (error) | |
494 | goto out; | |
f55ab26a | 495 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
496 | |
497 | error = gfs2_meta_inode_buffer(ip, &bh); | |
498 | if (error) | |
499 | goto out_end_trans; | |
907b9bce | 500 | |
b3b94faa DT |
501 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
502 | ||
503 | if (!ir.ir_length) { | |
504 | struct buffer_head *m_bh; | |
cd915493 | 505 | u64 x, y; |
b44b84d7 | 506 | __be64 z; |
b3b94faa DT |
507 | |
508 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
509 | if (error) | |
510 | goto out_brelse; | |
511 | ||
b44b84d7 AV |
512 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
513 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
514 | ir.ir_start = x; |
515 | ir.ir_length = GFS2_INUM_QUANTUM; | |
516 | x += GFS2_INUM_QUANTUM; | |
517 | if (x < y) | |
518 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 519 | z = cpu_to_be64(x); |
d4e9c4c3 | 520 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 521 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
522 | |
523 | brelse(m_bh); | |
524 | } | |
525 | ||
526 | *formal_ino = ir.ir_start++; | |
527 | ir.ir_length--; | |
528 | ||
d4e9c4c3 | 529 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
530 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
531 | ||
420b9e5e | 532 | out_brelse: |
b3b94faa | 533 | brelse(bh); |
420b9e5e | 534 | out_end_trans: |
f55ab26a | 535 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 536 | gfs2_trans_end(sdp); |
420b9e5e | 537 | out: |
b3b94faa | 538 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
539 | return error; |
540 | } | |
541 | ||
cd915493 | 542 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
543 | { |
544 | int error; | |
545 | ||
546 | error = pick_formal_ino_1(sdp, inum); | |
547 | if (error <= 0) | |
548 | return error; | |
549 | ||
550 | error = pick_formal_ino_2(sdp, inum); | |
551 | ||
552 | return error; | |
553 | } | |
554 | ||
555 | /** | |
556 | * create_ok - OK to create a new on-disk inode here? | |
557 | * @dip: Directory in which dinode is to be created | |
558 | * @name: Name of new dinode | |
559 | * @mode: | |
560 | * | |
561 | * Returns: errno | |
562 | */ | |
563 | ||
feaa7bba | 564 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
565 | unsigned int mode) |
566 | { | |
567 | int error; | |
568 | ||
faf450ef | 569 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
570 | if (error) |
571 | return error; | |
572 | ||
573 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 574 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
575 | return -EPERM; |
576 | ||
feaa7bba | 577 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
578 | switch (error) { |
579 | case -ENOENT: | |
580 | error = 0; | |
581 | break; | |
582 | case 0: | |
583 | return -EEXIST; | |
584 | default: | |
585 | return error; | |
586 | } | |
587 | ||
cd915493 | 588 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 589 | return -EFBIG; |
4f56110a | 590 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
591 | return -EMLINK; |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
597 | unsigned int *uid, unsigned int *gid) | |
598 | { | |
feaa7bba | 599 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 600 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
601 | if (S_ISDIR(*mode)) |
602 | *mode |= S_ISUID; | |
2933f925 | 603 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 604 | *mode &= ~07111; |
2933f925 | 605 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
606 | } else |
607 | *uid = current->fsuid; | |
608 | ||
b60623c2 | 609 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
610 | if (S_ISDIR(*mode)) |
611 | *mode |= S_ISGID; | |
2933f925 | 612 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
613 | } else |
614 | *gid = current->fsgid; | |
615 | } | |
616 | ||
629a21e7 | 617 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 618 | u64 *generation) |
b3b94faa | 619 | { |
feaa7bba | 620 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
621 | int error; |
622 | ||
623 | gfs2_alloc_get(dip); | |
624 | ||
625 | dip->i_alloc.al_requested = RES_DINODE; | |
626 | error = gfs2_inplace_reserve(dip); | |
627 | if (error) | |
628 | goto out; | |
629 | ||
feaa7bba | 630 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
631 | if (error) |
632 | goto out_ipreserv; | |
633 | ||
4340fe62 | 634 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
635 | |
636 | gfs2_trans_end(sdp); | |
637 | ||
4340fe62 | 638 | out_ipreserv: |
b3b94faa | 639 | gfs2_inplace_release(dip); |
4340fe62 | 640 | out: |
b3b94faa | 641 | gfs2_alloc_put(dip); |
b3b94faa DT |
642 | return error; |
643 | } | |
644 | ||
645 | /** | |
646 | * init_dinode - Fill in a new dinode structure | |
647 | * @dip: the directory this inode is being created in | |
648 | * @gl: The glock covering the new inode | |
649 | * @inum: the inode number | |
650 | * @mode: the file permissions | |
651 | * @uid: | |
652 | * @gid: | |
653 | * | |
654 | */ | |
655 | ||
656 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 657 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 658 | unsigned int uid, unsigned int gid, |
e7f14f4d | 659 | const u64 *generation, dev_t dev) |
b3b94faa | 660 | { |
feaa7bba | 661 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 662 | struct gfs2_dinode *di; |
b3b94faa DT |
663 | struct buffer_head *dibh; |
664 | ||
665 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 666 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
667 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
668 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
669 | di = (struct gfs2_dinode *)dibh->b_data; |
670 | ||
2442a098 SW |
671 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
672 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
673 | di->di_mode = cpu_to_be32(mode); |
674 | di->di_uid = cpu_to_be32(uid); | |
675 | di->di_gid = cpu_to_be32(gid); | |
676 | di->di_nlink = cpu_to_be32(0); | |
677 | di->di_size = cpu_to_be64(0); | |
678 | di->di_blocks = cpu_to_be64(1); | |
679 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
680 | di->di_major = cpu_to_be32(MAJOR(dev)); |
681 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 682 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 683 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 684 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
685 | |
686 | if (S_ISREG(mode)) { | |
687 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
688 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 689 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
690 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
691 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 692 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 693 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
694 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
695 | GFS2_DIF_INHERIT_DIRECTIO); | |
696 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
697 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
698 | } |
699 | ||
b96ca4fa | 700 | di->__pad1 = 0; |
a9583c79 | 701 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
b96ca4fa SW |
702 | di->di_height = cpu_to_be32(0); |
703 | di->__pad2 = 0; | |
704 | di->__pad3 = 0; | |
705 | di->di_depth = cpu_to_be16(0); | |
706 | di->di_entries = cpu_to_be32(0); | |
707 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
708 | di->di_eattr = cpu_to_be64(0); | |
709 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
710 | ||
b3b94faa DT |
711 | brelse(dibh); |
712 | } | |
713 | ||
714 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 715 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 716 | const u64 *generation, dev_t dev) |
b3b94faa | 717 | { |
feaa7bba | 718 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
719 | unsigned int uid, gid; |
720 | int error; | |
721 | ||
722 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
723 | gfs2_alloc_get(dip); |
724 | ||
725 | error = gfs2_quota_lock(dip, uid, gid); | |
726 | if (error) | |
727 | goto out; | |
728 | ||
729 | error = gfs2_quota_check(dip, uid, gid); | |
730 | if (error) | |
731 | goto out_quota; | |
732 | ||
feaa7bba | 733 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
734 | if (error) |
735 | goto out_quota; | |
736 | ||
e7f14f4d | 737 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 738 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
739 | gfs2_trans_end(sdp); |
740 | ||
feaa7bba | 741 | out_quota: |
b3b94faa | 742 | gfs2_quota_unlock(dip); |
feaa7bba | 743 | out: |
b3b94faa | 744 | gfs2_alloc_put(dip); |
b3b94faa DT |
745 | return error; |
746 | } | |
747 | ||
feaa7bba SW |
748 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
749 | struct gfs2_inode *ip) | |
b3b94faa | 750 | { |
feaa7bba | 751 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
752 | struct gfs2_alloc *al; |
753 | int alloc_required; | |
754 | struct buffer_head *dibh; | |
755 | int error; | |
756 | ||
757 | al = gfs2_alloc_get(dip); | |
758 | ||
759 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
760 | if (error) | |
761 | goto fail; | |
762 | ||
feaa7bba | 763 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
764 | if (alloc_required < 0) |
765 | goto fail; | |
b3b94faa | 766 | if (alloc_required) { |
2933f925 | 767 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
768 | if (error) |
769 | goto fail_quota_locks; | |
770 | ||
771 | al->al_requested = sdp->sd_max_dirres; | |
772 | ||
773 | error = gfs2_inplace_reserve(dip); | |
774 | if (error) | |
775 | goto fail_quota_locks; | |
776 | ||
320dd101 | 777 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 778 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 779 | 2 * RES_DINODE + |
b3b94faa DT |
780 | RES_STATFS + RES_QUOTA, 0); |
781 | if (error) | |
782 | goto fail_ipreserv; | |
783 | } else { | |
feaa7bba | 784 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
785 | if (error) |
786 | goto fail_quota_locks; | |
787 | } | |
788 | ||
b60623c2 | 789 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
790 | if (error) |
791 | goto fail_end_trans; | |
792 | ||
793 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
794 | if (error) | |
795 | goto fail_end_trans; | |
4f56110a | 796 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 797 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 798 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 799 | brelse(dibh); |
b3b94faa DT |
800 | return 0; |
801 | ||
320dd101 | 802 | fail_end_trans: |
b3b94faa DT |
803 | gfs2_trans_end(sdp); |
804 | ||
320dd101 | 805 | fail_ipreserv: |
b3b94faa DT |
806 | if (dip->i_alloc.al_rgd) |
807 | gfs2_inplace_release(dip); | |
808 | ||
320dd101 | 809 | fail_quota_locks: |
b3b94faa DT |
810 | gfs2_quota_unlock(dip); |
811 | ||
320dd101 | 812 | fail: |
b3b94faa | 813 | gfs2_alloc_put(dip); |
b3b94faa DT |
814 | return error; |
815 | } | |
816 | ||
fcb47e0b RH |
817 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
818 | { | |
819 | int err; | |
820 | size_t len; | |
821 | void *value; | |
822 | char *name; | |
823 | struct gfs2_ea_request er; | |
824 | ||
825 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
826 | &name, &value, &len); | |
827 | ||
828 | if (err) { | |
829 | if (err == -EOPNOTSUPP) | |
830 | return 0; | |
831 | return err; | |
832 | } | |
833 | ||
834 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
835 | ||
836 | er.er_type = GFS2_EATYPE_SECURITY; | |
837 | er.er_name = name; | |
838 | er.er_data = value; | |
839 | er.er_name_len = strlen(name); | |
840 | er.er_data_len = len; | |
841 | ||
842 | err = gfs2_ea_set_i(ip, &er); | |
843 | ||
844 | kfree(value); | |
845 | kfree(name); | |
846 | ||
847 | return err; | |
848 | } | |
849 | ||
b3b94faa DT |
850 | /** |
851 | * gfs2_createi - Create a new inode | |
852 | * @ghs: An array of two holders | |
853 | * @name: The name of the new file | |
854 | * @mode: the permissions on the new inode | |
855 | * | |
856 | * @ghs[0] is an initialized holder for the directory | |
857 | * @ghs[1] is the holder for the inode lock | |
858 | * | |
7359a19c | 859 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
860 | * file are held. A transaction has been started and an inplace reservation |
861 | * is held, as well. | |
862 | * | |
7359a19c | 863 | * Returns: An inode |
b3b94faa DT |
864 | */ |
865 | ||
feaa7bba | 866 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 867 | unsigned int mode, dev_t dev) |
b3b94faa | 868 | { |
7359a19c | 869 | struct inode *inode; |
5c676f6d | 870 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
871 | struct inode *dir = &dip->i_inode; |
872 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 873 | struct gfs2_inum_host inum; |
b3b94faa | 874 | int error; |
4340fe62 | 875 | u64 generation; |
b3b94faa DT |
876 | |
877 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 878 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 879 | |
b3b94faa DT |
880 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
881 | error = gfs2_glock_nq(ghs); | |
882 | if (error) | |
883 | goto fail; | |
884 | ||
885 | error = create_ok(dip, name, mode); | |
886 | if (error) | |
887 | goto fail_gunlock; | |
888 | ||
feaa7bba | 889 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
890 | if (error) |
891 | goto fail_gunlock; | |
892 | ||
4340fe62 | 893 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
894 | if (error) |
895 | goto fail_gunlock; | |
896 | ||
feaa7bba | 897 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
898 | gfs2_glock_dq(ghs); |
899 | ||
feaa7bba | 900 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
901 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
902 | GL_SKIP, ghs + 1); | |
b3b94faa | 903 | if (error) { |
7359a19c | 904 | return ERR_PTR(error); |
b3b94faa DT |
905 | } |
906 | ||
907 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
908 | error = gfs2_glock_nq(ghs); | |
909 | if (error) { | |
910 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 911 | return ERR_PTR(error); |
b3b94faa DT |
912 | } |
913 | ||
914 | error = create_ok(dip, name, mode); | |
915 | if (error) | |
916 | goto fail_gunlock2; | |
917 | } else { | |
feaa7bba | 918 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
919 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
920 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
921 | if (error) |
922 | goto fail_gunlock; | |
923 | } | |
924 | ||
e7f14f4d | 925 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
926 | if (error) |
927 | goto fail_gunlock2; | |
928 | ||
feaa7bba SW |
929 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
930 | if (IS_ERR(inode)) | |
b3b94faa DT |
931 | goto fail_gunlock2; |
932 | ||
feaa7bba | 933 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
934 | if (error) |
935 | goto fail_iput; | |
936 | ||
feaa7bba | 937 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
938 | if (error) |
939 | goto fail_iput; | |
940 | ||
fcb47e0b RH |
941 | error = gfs2_security_init(dip, GFS2_I(inode)); |
942 | if (error) | |
943 | goto fail_iput; | |
944 | ||
feaa7bba | 945 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
946 | if (error) |
947 | goto fail_iput; | |
948 | ||
7359a19c SW |
949 | if (!inode) |
950 | return ERR_PTR(-ENOMEM); | |
951 | return inode; | |
b3b94faa | 952 | |
320dd101 | 953 | fail_iput: |
feaa7bba | 954 | iput(inode); |
320dd101 | 955 | fail_gunlock2: |
b3b94faa | 956 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 957 | fail_gunlock: |
b3b94faa | 958 | gfs2_glock_dq(ghs); |
320dd101 | 959 | fail: |
7359a19c | 960 | return ERR_PTR(error); |
b3b94faa DT |
961 | } |
962 | ||
b3b94faa DT |
963 | /** |
964 | * gfs2_rmdiri - Remove a directory | |
965 | * @dip: The parent directory of the directory to be removed | |
966 | * @name: The name of the directory to be removed | |
967 | * @ip: The GFS2 inode of the directory to be removed | |
968 | * | |
969 | * Assumes Glocks on dip and ip are held | |
970 | * | |
971 | * Returns: errno | |
972 | */ | |
973 | ||
feaa7bba SW |
974 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
975 | struct gfs2_inode *ip) | |
b3b94faa | 976 | { |
b3b94faa DT |
977 | struct qstr dotname; |
978 | int error; | |
979 | ||
980 | if (ip->i_di.di_entries != 2) { | |
981 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 982 | gfs2_dinode_print(ip); |
b3b94faa DT |
983 | return -EIO; |
984 | } | |
985 | ||
986 | error = gfs2_dir_del(dip, name); | |
987 | if (error) | |
988 | return error; | |
989 | ||
990 | error = gfs2_change_nlink(dip, -1); | |
991 | if (error) | |
992 | return error; | |
993 | ||
71b86f56 | 994 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
995 | error = gfs2_dir_del(ip, &dotname); |
996 | if (error) | |
997 | return error; | |
998 | ||
feaa7bba | 999 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
1000 | error = gfs2_dir_del(ip, &dotname); |
1001 | if (error) | |
1002 | return error; | |
1003 | ||
4f56110a SW |
1004 | /* It looks odd, but it really should be done twice */ |
1005 | error = gfs2_change_nlink(ip, -1); | |
1006 | if (error) | |
1007 | return error; | |
1008 | ||
1009 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
1010 | if (error) |
1011 | return error; | |
1012 | ||
b3b94faa DT |
1013 | return error; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1018 | * @dip: the directory | |
1019 | * @name: the name of the file | |
1020 | * @ip: the inode | |
1021 | * | |
1022 | * Assumes that the lock on (at least) @dip is held. | |
1023 | * | |
1024 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1025 | */ | |
1026 | ||
feaa7bba | 1027 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1028 | struct gfs2_inode *ip) |
1029 | { | |
629a21e7 | 1030 | struct gfs2_inum_host inum; |
b3b94faa DT |
1031 | unsigned int type; |
1032 | int error; | |
1033 | ||
feaa7bba | 1034 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1035 | return -EPERM; |
1036 | ||
b60623c2 | 1037 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1038 | dip->i_inode.i_uid != current->fsuid && |
1039 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1040 | return -EPERM; |
1041 | ||
feaa7bba | 1042 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1043 | return -EPERM; |
1044 | ||
faf450ef | 1045 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1046 | if (error) |
1047 | return error; | |
1048 | ||
feaa7bba | 1049 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1050 | if (error) |
1051 | return error; | |
1052 | ||
1053 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1054 | return -ENOENT; | |
1055 | ||
b60623c2 | 1056 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
1057 | gfs2_consist_inode(dip); |
1058 | return -EIO; | |
1059 | } | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1066 | * @this: move this | |
1067 | * @to: to here | |
1068 | * | |
1069 | * Follow @to back to the root and make sure we don't encounter @this | |
1070 | * Assumes we already hold the rename lock. | |
1071 | * | |
1072 | * Returns: errno | |
1073 | */ | |
1074 | ||
1075 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1076 | { | |
feaa7bba | 1077 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1078 | struct super_block *sb = dir->i_sb; |
7359a19c | 1079 | struct inode *tmp; |
b3b94faa DT |
1080 | struct qstr dotdot; |
1081 | int error = 0; | |
1082 | ||
71b86f56 | 1083 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1084 | |
7359a19c | 1085 | igrab(dir); |
b3b94faa DT |
1086 | |
1087 | for (;;) { | |
feaa7bba | 1088 | if (dir == &this->i_inode) { |
b3b94faa DT |
1089 | error = -EINVAL; |
1090 | break; | |
1091 | } | |
c9fd4307 | 1092 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1093 | error = 0; |
1094 | break; | |
1095 | } | |
1096 | ||
c752666c SW |
1097 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1098 | if (IS_ERR(tmp)) { | |
1099 | error = PTR_ERR(tmp); | |
b3b94faa | 1100 | break; |
c752666c | 1101 | } |
b3b94faa | 1102 | |
7359a19c SW |
1103 | iput(dir); |
1104 | dir = tmp; | |
b3b94faa DT |
1105 | } |
1106 | ||
7359a19c | 1107 | iput(dir); |
b3b94faa DT |
1108 | |
1109 | return error; | |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * gfs2_readlinki - return the contents of a symlink | |
1114 | * @ip: the symlink's inode | |
1115 | * @buf: a pointer to the buffer to be filled | |
1116 | * @len: a pointer to the length of @buf | |
1117 | * | |
1118 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1119 | * to be freed by the caller. | |
1120 | * | |
1121 | * Returns: errno | |
1122 | */ | |
1123 | ||
1124 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1125 | { | |
1126 | struct gfs2_holder i_gh; | |
1127 | struct buffer_head *dibh; | |
1128 | unsigned int x; | |
1129 | int error; | |
1130 | ||
1131 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1132 | error = gfs2_glock_nq_atime(&i_gh); | |
1133 | if (error) { | |
1134 | gfs2_holder_uninit(&i_gh); | |
1135 | return error; | |
1136 | } | |
1137 | ||
1138 | if (!ip->i_di.di_size) { | |
1139 | gfs2_consist_inode(ip); | |
1140 | error = -EIO; | |
1141 | goto out; | |
1142 | } | |
1143 | ||
1144 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1145 | if (error) | |
1146 | goto out; | |
1147 | ||
1148 | x = ip->i_di.di_size + 1; | |
1149 | if (x > *len) { | |
1150 | *buf = kmalloc(x, GFP_KERNEL); | |
1151 | if (!*buf) { | |
1152 | error = -ENOMEM; | |
1153 | goto out_brelse; | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1158 | *len = x; | |
1159 | ||
feaa7bba | 1160 | out_brelse: |
b3b94faa | 1161 | brelse(dibh); |
feaa7bba | 1162 | out: |
b3b94faa | 1163 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1164 | return error; |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1169 | * conditionally update the inode's atime | |
1170 | * @gh: the holder to acquire | |
1171 | * | |
1172 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1173 | * Update if the difference between the current time and the inode's current | |
1174 | * atime is greater than an interval specified at mount. | |
1175 | * | |
1176 | * Returns: errno | |
1177 | */ | |
1178 | ||
1179 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1180 | { | |
1181 | struct gfs2_glock *gl = gh->gh_gl; | |
1182 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1183 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1184 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1185 | unsigned int state; |
1186 | int flags; | |
1187 | int error; | |
1188 | ||
1189 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1190 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1191 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1192 | return -EINVAL; | |
1193 | ||
1194 | state = gh->gh_state; | |
1195 | flags = gh->gh_flags; | |
1196 | ||
1197 | error = gfs2_glock_nq(gh); | |
1198 | if (error) | |
1199 | return error; | |
1200 | ||
1201 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1202 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1203 | return 0; | |
1204 | ||
1205 | curtime = get_seconds(); | |
1a7b1eed | 1206 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1207 | gfs2_glock_dq(gh); |
fd88de56 SW |
1208 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1209 | gh); | |
b3b94faa DT |
1210 | error = gfs2_glock_nq(gh); |
1211 | if (error) | |
1212 | return error; | |
1213 | ||
1214 | /* Verify that atime hasn't been updated while we were | |
1215 | trying to get exclusive lock. */ | |
1216 | ||
1217 | curtime = get_seconds(); | |
1a7b1eed | 1218 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1219 | struct buffer_head *dibh; |
48516ced | 1220 | struct gfs2_dinode *di; |
b3b94faa DT |
1221 | |
1222 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1223 | if (error == -EROFS) | |
1224 | return 0; | |
1225 | if (error) | |
1226 | goto fail; | |
1227 | ||
1228 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1229 | if (error) | |
1230 | goto fail_end_trans; | |
1231 | ||
1a7b1eed | 1232 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1233 | |
d4e9c4c3 | 1234 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1235 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1236 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1237 | brelse(dibh); |
1238 | ||
1239 | gfs2_trans_end(sdp); | |
1240 | } | |
1241 | ||
1242 | /* If someone else has asked for the glock, | |
1243 | unlock and let them have it. Then reacquire | |
1244 | in the original state. */ | |
1245 | if (gfs2_glock_is_blocking(gl)) { | |
1246 | gfs2_glock_dq(gh); | |
1247 | gfs2_holder_reinit(state, flags, gh); | |
1248 | return gfs2_glock_nq(gh); | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | return 0; | |
1253 | ||
feaa7bba | 1254 | fail_end_trans: |
b3b94faa | 1255 | gfs2_trans_end(sdp); |
feaa7bba | 1256 | fail: |
b3b94faa | 1257 | gfs2_glock_dq(gh); |
b3b94faa DT |
1258 | return error; |
1259 | } | |
1260 | ||
1261 | /** | |
1262 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1263 | * @arg_a: the first structure | |
1264 | * @arg_b: the second structure | |
1265 | * | |
1266 | * Returns: 1 if A > B | |
1267 | * -1 if A < B | |
75d3b817 | 1268 | * 0 if A == B |
b3b94faa DT |
1269 | */ |
1270 | ||
1271 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1272 | { | |
75d3b817 SW |
1273 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1274 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1275 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1276 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1277 | |
1278 | if (a->ln_number > b->ln_number) | |
75d3b817 SW |
1279 | return 1; |
1280 | if (a->ln_number < b->ln_number) | |
1281 | return -1; | |
1282 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1283 | return 1; | |
1284 | if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) | |
1285 | return 1; | |
b3b94faa | 1286 | |
75d3b817 | 1287 | return 0; |
b3b94faa DT |
1288 | } |
1289 | ||
1290 | /** | |
1291 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1292 | * atime update | |
1293 | * @num_gh: the number of structures | |
1294 | * @ghs: an array of struct gfs2_holder structures | |
1295 | * | |
1296 | * Returns: 0 on success (all glocks acquired), | |
1297 | * errno on failure (no glocks acquired) | |
1298 | */ | |
1299 | ||
1300 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1301 | { | |
1302 | struct gfs2_holder **p; | |
1303 | unsigned int x; | |
1304 | int error = 0; | |
1305 | ||
1306 | if (!num_gh) | |
1307 | return 0; | |
1308 | ||
1309 | if (num_gh == 1) { | |
1310 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1311 | if (ghs->gh_flags & GL_ATIME) | |
1312 | error = gfs2_glock_nq_atime(ghs); | |
1313 | else | |
1314 | error = gfs2_glock_nq(ghs); | |
1315 | return error; | |
1316 | } | |
1317 | ||
1318 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1319 | if (!p) | |
1320 | return -ENOMEM; | |
1321 | ||
1322 | for (x = 0; x < num_gh; x++) | |
1323 | p[x] = &ghs[x]; | |
1324 | ||
1325 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1326 | ||
1327 | for (x = 0; x < num_gh; x++) { | |
1328 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1329 | ||
1330 | if (p[x]->gh_flags & GL_ATIME) | |
1331 | error = gfs2_glock_nq_atime(p[x]); | |
1332 | else | |
1333 | error = gfs2_glock_nq(p[x]); | |
1334 | ||
1335 | if (error) { | |
1336 | while (x--) | |
1337 | gfs2_glock_dq(p[x]); | |
1338 | break; | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | kfree(p); | |
b3b94faa DT |
1343 | return error; |
1344 | } | |
1345 | ||
b3b94faa DT |
1346 | |
1347 | static int | |
1348 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1349 | { | |
1350 | struct buffer_head *dibh; | |
1351 | int error; | |
1352 | ||
1353 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1354 | if (!error) { | |
feaa7bba SW |
1355 | error = inode_setattr(&ip->i_inode, attr); |
1356 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1357 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1358 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1359 | brelse(dibh); |
1360 | } | |
1361 | return error; | |
1362 | } | |
1363 | ||
1364 | /** | |
1365 | * gfs2_setattr_simple - | |
1366 | * @ip: | |
1367 | * @attr: | |
1368 | * | |
1369 | * Called with a reference on the vnode. | |
1370 | * | |
1371 | * Returns: errno | |
1372 | */ | |
1373 | ||
1374 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1375 | { | |
1376 | int error; | |
1377 | ||
5c676f6d | 1378 | if (current->journal_info) |
b3b94faa DT |
1379 | return __gfs2_setattr_simple(ip, attr); |
1380 | ||
feaa7bba | 1381 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1382 | if (error) |
1383 | return error; | |
1384 | ||
1385 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1386 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1387 | return error; |
1388 | } | |
1389 |