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Commit | Line | Data |
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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 | 40 | |
feaa7bba SW |
41 | static int iget_test(struct inode *inode, void *opaque) |
42 | { | |
43 | struct gfs2_inode *ip = GFS2_I(inode); | |
629a21e7 | 44 | struct gfs2_inum_host *inum = opaque; |
feaa7bba | 45 | |
9e2dbdac | 46 | if (ip->i_num.no_addr == inum->no_addr) |
feaa7bba | 47 | return 1; |
b3b94faa | 48 | |
feaa7bba SW |
49 | return 0; |
50 | } | |
51 | ||
52 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 53 | { |
feaa7bba | 54 | struct gfs2_inode *ip = GFS2_I(inode); |
629a21e7 | 55 | struct gfs2_inum_host *inum = opaque; |
b3b94faa | 56 | |
feaa7bba | 57 | ip->i_num = *inum; |
e7c698d7 | 58 | inode->i_ino = inum->no_addr; |
feaa7bba SW |
59 | return 0; |
60 | } | |
b3b94faa | 61 | |
629a21e7 | 62 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
63 | { |
64 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
65 | iget_test, inum); | |
66 | } | |
b3b94faa | 67 | |
629a21e7 | 68 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
69 | { |
70 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
71 | iget_test, iget_set, inum); | |
b3b94faa DT |
72 | } |
73 | ||
74 | /** | |
feaa7bba SW |
75 | * gfs2_inode_lookup - Lookup an inode |
76 | * @sb: The super block | |
77 | * @inum: The inode number | |
78 | * @type: The type of the inode | |
b3b94faa | 79 | * |
feaa7bba | 80 | * Returns: A VFS inode, or an error |
b3b94faa DT |
81 | */ |
82 | ||
629a21e7 | 83 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
b3b94faa | 84 | { |
feaa7bba SW |
85 | struct inode *inode = gfs2_iget(sb, inum); |
86 | struct gfs2_inode *ip = GFS2_I(inode); | |
87 | struct gfs2_glock *io_gl; | |
88 | int error; | |
b3b94faa | 89 | |
26d83ded SW |
90 | if (!inode) |
91 | return ERR_PTR(-ENOBUFS); | |
92 | ||
feaa7bba SW |
93 | if (inode->i_state & I_NEW) { |
94 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
95 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 96 | inode->i_private = ip; |
feaa7bba SW |
97 | inode->i_mode = mode; |
98 | ||
99 | if (S_ISREG(mode)) { | |
100 | inode->i_op = &gfs2_file_iops; | |
101 | inode->i_fop = &gfs2_file_fops; | |
102 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
103 | } else if (S_ISDIR(mode)) { | |
104 | inode->i_op = &gfs2_dir_iops; | |
105 | inode->i_fop = &gfs2_dir_fops; | |
106 | } else if (S_ISLNK(mode)) { | |
107 | inode->i_op = &gfs2_symlink_iops; | |
108 | } else { | |
109 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 110 | } |
b3b94faa | 111 | |
feaa7bba SW |
112 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
113 | if (unlikely(error)) | |
114 | goto fail; | |
115 | ip->i_gl->gl_object = ip; | |
b3b94faa | 116 | |
feaa7bba SW |
117 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
118 | if (unlikely(error)) | |
119 | goto fail_put; | |
b3b94faa | 120 | |
bfded27b | 121 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
122 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
123 | if (unlikely(error)) | |
124 | goto fail_iopen; | |
b3b94faa | 125 | |
feaa7bba SW |
126 | gfs2_glock_put(io_gl); |
127 | unlock_new_inode(inode); | |
128 | } | |
b3b94faa DT |
129 | |
130 | return inode; | |
feaa7bba SW |
131 | fail_iopen: |
132 | gfs2_glock_put(io_gl); | |
133 | fail_put: | |
134 | ip->i_gl->gl_object = NULL; | |
135 | gfs2_glock_put(ip->i_gl); | |
136 | fail: | |
137 | iput(inode); | |
138 | return ERR_PTR(error); | |
b3b94faa DT |
139 | } |
140 | ||
af339c02 | 141 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
142 | { |
143 | struct gfs2_dinode_host *di = &ip->i_di; | |
144 | const struct gfs2_dinode *str = buf; | |
145 | ||
af339c02 SW |
146 | if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { |
147 | if (gfs2_consist_inode(ip)) | |
148 | gfs2_dinode_print(ip); | |
149 | return -EIO; | |
150 | } | |
151 | if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) | |
152 | return -ESTALE; | |
ea744d01 | 153 | |
b60623c2 | 154 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 155 | ip->i_inode.i_rdev = 0; |
b60623c2 | 156 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
157 | case S_IFBLK: |
158 | case S_IFCHR: | |
159 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
160 | be32_to_cpu(str->di_minor)); | |
161 | break; | |
162 | }; | |
163 | ||
2933f925 SW |
164 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
165 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
166 | /* |
167 | * We will need to review setting the nlink count here in the | |
168 | * light of the forthcoming ro bind mount work. This is a reminder | |
169 | * to do that. | |
170 | */ | |
171 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 | 172 | di->di_size = be64_to_cpu(str->di_size); |
9e2dbdac | 173 | i_size_write(&ip->i_inode, di->di_size); |
ea744d01 | 174 | di->di_blocks = be64_to_cpu(str->di_blocks); |
9e2dbdac | 175 | gfs2_set_inode_blocks(&ip->i_inode); |
1a7b1eed SW |
176 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
177 | ip->i_inode.i_atime.tv_nsec = 0; | |
178 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); | |
179 | ip->i_inode.i_mtime.tv_nsec = 0; | |
180 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); | |
181 | ip->i_inode.i_ctime.tv_nsec = 0; | |
ea744d01 SW |
182 | |
183 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
184 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
185 | di->di_generation = be64_to_cpu(str->di_generation); | |
186 | ||
187 | di->di_flags = be32_to_cpu(str->di_flags); | |
6b124d8d | 188 | gfs2_set_inode_flags(&ip->i_inode); |
ea744d01 SW |
189 | di->di_height = be16_to_cpu(str->di_height); |
190 | ||
191 | di->di_depth = be16_to_cpu(str->di_depth); | |
192 | di->di_entries = be32_to_cpu(str->di_entries); | |
193 | ||
194 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 195 | return 0; |
ea744d01 SW |
196 | } |
197 | ||
b3b94faa DT |
198 | /** |
199 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
200 | * @ip: The GFS2 inode | |
201 | * | |
202 | * Returns: errno | |
203 | */ | |
204 | ||
205 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
206 | { | |
207 | struct buffer_head *dibh; | |
208 | int error; | |
209 | ||
210 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
211 | if (error) | |
212 | return error; | |
213 | ||
feaa7bba | 214 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
215 | brelse(dibh); |
216 | return -EIO; | |
217 | } | |
218 | ||
af339c02 | 219 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 220 | brelse(dibh); |
bfded27b | 221 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 222 | |
af339c02 | 223 | return error; |
b3b94faa DT |
224 | } |
225 | ||
feaa7bba | 226 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 227 | { |
feaa7bba | 228 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
229 | struct gfs2_alloc *al; |
230 | struct gfs2_rgrpd *rgd; | |
231 | int error; | |
232 | ||
233 | if (ip->i_di.di_blocks != 1) { | |
234 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 235 | gfs2_dinode_print(ip); |
b3b94faa DT |
236 | return -EIO; |
237 | } | |
238 | ||
239 | al = gfs2_alloc_get(ip); | |
240 | ||
241 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
242 | if (error) | |
243 | goto out; | |
244 | ||
245 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
246 | if (error) | |
247 | goto out_qs; | |
248 | ||
249 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
250 | if (!rgd) { | |
251 | gfs2_consist_inode(ip); | |
252 | error = -EIO; | |
253 | goto out_rindex_relse; | |
254 | } | |
255 | ||
256 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
257 | &al->al_rgd_gh); | |
258 | if (error) | |
259 | goto out_rindex_relse; | |
260 | ||
420b9e5e | 261 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
262 | if (error) |
263 | goto out_rg_gunlock; | |
264 | ||
265 | gfs2_trans_add_gl(ip->i_gl); | |
266 | ||
267 | gfs2_free_di(rgd, ip); | |
268 | ||
b3b94faa DT |
269 | gfs2_trans_end(sdp); |
270 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
271 | ||
feaa7bba | 272 | out_rg_gunlock: |
b3b94faa | 273 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 274 | out_rindex_relse: |
b3b94faa | 275 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 276 | out_qs: |
b3b94faa | 277 | gfs2_quota_unhold(ip); |
36327521 | 278 | out: |
feaa7bba | 279 | gfs2_alloc_put(ip); |
b3b94faa DT |
280 | return error; |
281 | } | |
282 | ||
b3b94faa DT |
283 | /** |
284 | * gfs2_change_nlink - Change nlink count on inode | |
285 | * @ip: The GFS2 inode | |
286 | * @diff: The change in the nlink count required | |
287 | * | |
288 | * Returns: errno | |
289 | */ | |
290 | ||
291 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
292 | { | |
feaa7bba | 293 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa | 294 | struct buffer_head *dibh; |
cd915493 | 295 | u32 nlink; |
b3b94faa DT |
296 | int error; |
297 | ||
4f56110a SW |
298 | BUG_ON(diff != 1 && diff != -1); |
299 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
300 | |
301 | /* If we are reducing the nlink count, but the new value ends up being | |
302 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 303 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 304 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 305 | gfs2_dinode_print(ip); |
b3b94faa DT |
306 | return -EIO; |
307 | } | |
308 | ||
309 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
310 | if (error) | |
311 | return error; | |
312 | ||
4f56110a SW |
313 | if (diff > 0) |
314 | inc_nlink(&ip->i_inode); | |
315 | else | |
316 | drop_nlink(&ip->i_inode); | |
317 | ||
1a7b1eed | 318 | ip->i_inode.i_ctime.tv_sec = get_seconds(); |
b3b94faa | 319 | |
d4e9c4c3 | 320 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 321 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 322 | brelse(dibh); |
feaa7bba | 323 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 324 | |
4f56110a | 325 | if (ip->i_inode.i_nlink == 0) { |
feaa7bba SW |
326 | struct gfs2_rgrpd *rgd; |
327 | struct gfs2_holder ri_gh, rg_gh; | |
328 | ||
329 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
330 | if (error) | |
331 | goto out; | |
332 | error = -EIO; | |
333 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
334 | if (!rgd) | |
335 | goto out_norgrp; | |
336 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
337 | if (error) | |
338 | goto out_norgrp; | |
339 | ||
340 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
341 | gfs2_glock_dq_uninit(&rg_gh); | |
342 | out_norgrp: | |
343 | gfs2_glock_dq_uninit(&ri_gh); | |
344 | } | |
345 | out: | |
346 | return error; | |
b3b94faa DT |
347 | } |
348 | ||
c752666c SW |
349 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
350 | { | |
351 | struct qstr qstr; | |
71b86f56 | 352 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
353 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
354 | } | |
355 | ||
356 | ||
b3b94faa DT |
357 | /** |
358 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
359 | * @d_gh: An initialized holder for the directory glock | |
360 | * @name: The name of the inode to look for | |
361 | * @is_root: If 1, ignore the caller's permissions | |
362 | * @i_gh: An uninitialized holder for the new inode glock | |
363 | * | |
364 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
365 | * @is_root is true. | |
366 | * | |
367 | * Returns: errno | |
368 | */ | |
369 | ||
feaa7bba SW |
370 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
371 | int is_root, struct nameidata *nd) | |
b3b94faa | 372 | { |
c9fd4307 | 373 | struct super_block *sb = dir->i_sb; |
feaa7bba | 374 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 375 | struct gfs2_holder d_gh; |
629a21e7 | 376 | struct gfs2_inum_host inum; |
b3b94faa | 377 | unsigned int type; |
7359a19c | 378 | int error = 0; |
c752666c | 379 | struct inode *inode = NULL; |
b3b94faa DT |
380 | |
381 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 382 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 383 | |
c752666c SW |
384 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
385 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
386 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
387 | igrab(dir); |
388 | return dir; | |
b3b94faa DT |
389 | } |
390 | ||
391 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
392 | if (error) | |
c752666c | 393 | return ERR_PTR(error); |
b3b94faa DT |
394 | |
395 | if (!is_root) { | |
faf450ef | 396 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
397 | if (error) |
398 | goto out; | |
399 | } | |
400 | ||
c752666c | 401 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
402 | if (error) |
403 | goto out; | |
404 | ||
feaa7bba | 405 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 406 | |
7359a19c | 407 | out: |
b3b94faa | 408 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
409 | if (error == -ENOENT) |
410 | return NULL; | |
feaa7bba | 411 | return inode; |
b3b94faa DT |
412 | } |
413 | ||
cd915493 | 414 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 415 | { |
feaa7bba | 416 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 417 | struct buffer_head *bh; |
e6972647 | 418 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
419 | int error; |
420 | ||
421 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
422 | if (error) | |
423 | return error; | |
f55ab26a | 424 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
425 | |
426 | error = gfs2_meta_inode_buffer(ip, &bh); | |
427 | if (error) { | |
f55ab26a | 428 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
429 | gfs2_trans_end(sdp); |
430 | return error; | |
431 | } | |
432 | ||
433 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
434 | ||
435 | if (ir.ir_length) { | |
436 | *formal_ino = ir.ir_start++; | |
437 | ir.ir_length--; | |
d4e9c4c3 | 438 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
439 | gfs2_inum_range_out(&ir, |
440 | bh->b_data + sizeof(struct gfs2_dinode)); | |
441 | brelse(bh); | |
f55ab26a | 442 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
443 | gfs2_trans_end(sdp); |
444 | return 0; | |
445 | } | |
446 | ||
447 | brelse(bh); | |
448 | ||
f55ab26a | 449 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
450 | gfs2_trans_end(sdp); |
451 | ||
452 | return 1; | |
453 | } | |
454 | ||
cd915493 | 455 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 456 | { |
feaa7bba SW |
457 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
458 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
459 | struct gfs2_holder gh; |
460 | struct buffer_head *bh; | |
e6972647 | 461 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
462 | int error; |
463 | ||
464 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
465 | if (error) | |
466 | return error; | |
467 | ||
468 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
469 | if (error) | |
470 | goto out; | |
f55ab26a | 471 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
472 | |
473 | error = gfs2_meta_inode_buffer(ip, &bh); | |
474 | if (error) | |
475 | goto out_end_trans; | |
907b9bce | 476 | |
b3b94faa DT |
477 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
478 | ||
479 | if (!ir.ir_length) { | |
480 | struct buffer_head *m_bh; | |
cd915493 | 481 | u64 x, y; |
b44b84d7 | 482 | __be64 z; |
b3b94faa DT |
483 | |
484 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
485 | if (error) | |
486 | goto out_brelse; | |
487 | ||
b44b84d7 AV |
488 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
489 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
490 | ir.ir_start = x; |
491 | ir.ir_length = GFS2_INUM_QUANTUM; | |
492 | x += GFS2_INUM_QUANTUM; | |
493 | if (x < y) | |
494 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 495 | z = cpu_to_be64(x); |
d4e9c4c3 | 496 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 497 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
498 | |
499 | brelse(m_bh); | |
500 | } | |
501 | ||
502 | *formal_ino = ir.ir_start++; | |
503 | ir.ir_length--; | |
504 | ||
d4e9c4c3 | 505 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
506 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
507 | ||
420b9e5e | 508 | out_brelse: |
b3b94faa | 509 | brelse(bh); |
420b9e5e | 510 | out_end_trans: |
f55ab26a | 511 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 512 | gfs2_trans_end(sdp); |
420b9e5e | 513 | out: |
b3b94faa | 514 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
515 | return error; |
516 | } | |
517 | ||
cd915493 | 518 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
519 | { |
520 | int error; | |
521 | ||
522 | error = pick_formal_ino_1(sdp, inum); | |
523 | if (error <= 0) | |
524 | return error; | |
525 | ||
526 | error = pick_formal_ino_2(sdp, inum); | |
527 | ||
528 | return error; | |
529 | } | |
530 | ||
531 | /** | |
532 | * create_ok - OK to create a new on-disk inode here? | |
533 | * @dip: Directory in which dinode is to be created | |
534 | * @name: Name of new dinode | |
535 | * @mode: | |
536 | * | |
537 | * Returns: errno | |
538 | */ | |
539 | ||
feaa7bba | 540 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
541 | unsigned int mode) |
542 | { | |
543 | int error; | |
544 | ||
faf450ef | 545 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
546 | if (error) |
547 | return error; | |
548 | ||
549 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 550 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
551 | return -EPERM; |
552 | ||
feaa7bba | 553 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
554 | switch (error) { |
555 | case -ENOENT: | |
556 | error = 0; | |
557 | break; | |
558 | case 0: | |
559 | return -EEXIST; | |
560 | default: | |
561 | return error; | |
562 | } | |
563 | ||
cd915493 | 564 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 565 | return -EFBIG; |
4f56110a | 566 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
567 | return -EMLINK; |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
573 | unsigned int *uid, unsigned int *gid) | |
574 | { | |
feaa7bba | 575 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 576 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
577 | if (S_ISDIR(*mode)) |
578 | *mode |= S_ISUID; | |
2933f925 | 579 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 580 | *mode &= ~07111; |
2933f925 | 581 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
582 | } else |
583 | *uid = current->fsuid; | |
584 | ||
b60623c2 | 585 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
586 | if (S_ISDIR(*mode)) |
587 | *mode |= S_ISGID; | |
2933f925 | 588 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
589 | } else |
590 | *gid = current->fsgid; | |
591 | } | |
592 | ||
629a21e7 | 593 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 594 | u64 *generation) |
b3b94faa | 595 | { |
feaa7bba | 596 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
597 | int error; |
598 | ||
599 | gfs2_alloc_get(dip); | |
600 | ||
601 | dip->i_alloc.al_requested = RES_DINODE; | |
602 | error = gfs2_inplace_reserve(dip); | |
603 | if (error) | |
604 | goto out; | |
605 | ||
feaa7bba | 606 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
607 | if (error) |
608 | goto out_ipreserv; | |
609 | ||
4340fe62 | 610 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
611 | |
612 | gfs2_trans_end(sdp); | |
613 | ||
4340fe62 | 614 | out_ipreserv: |
b3b94faa | 615 | gfs2_inplace_release(dip); |
4340fe62 | 616 | out: |
b3b94faa | 617 | gfs2_alloc_put(dip); |
b3b94faa DT |
618 | return error; |
619 | } | |
620 | ||
621 | /** | |
622 | * init_dinode - Fill in a new dinode structure | |
623 | * @dip: the directory this inode is being created in | |
624 | * @gl: The glock covering the new inode | |
625 | * @inum: the inode number | |
626 | * @mode: the file permissions | |
627 | * @uid: | |
628 | * @gid: | |
629 | * | |
630 | */ | |
631 | ||
632 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 633 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 634 | unsigned int uid, unsigned int gid, |
e7f14f4d | 635 | const u64 *generation, dev_t dev) |
b3b94faa | 636 | { |
feaa7bba | 637 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 638 | struct gfs2_dinode *di; |
b3b94faa DT |
639 | struct buffer_head *dibh; |
640 | ||
641 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 642 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
643 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
644 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
645 | di = (struct gfs2_dinode *)dibh->b_data; |
646 | ||
2442a098 SW |
647 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
648 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
649 | di->di_mode = cpu_to_be32(mode); |
650 | di->di_uid = cpu_to_be32(uid); | |
651 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
652 | di->di_nlink = 0; |
653 | di->di_size = 0; | |
b96ca4fa SW |
654 | di->di_blocks = cpu_to_be64(1); |
655 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
656 | di->di_major = cpu_to_be32(MAJOR(dev)); |
657 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 658 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 659 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 660 | di->di_flags = 0; |
b3b94faa DT |
661 | |
662 | if (S_ISREG(mode)) { | |
663 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
664 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 665 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
666 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
667 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 668 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 669 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
670 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
671 | GFS2_DIF_INHERIT_DIRECTIO); | |
672 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
673 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
674 | } |
675 | ||
b96ca4fa | 676 | di->__pad1 = 0; |
a9583c79 | 677 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 678 | di->di_height = 0; |
b96ca4fa SW |
679 | di->__pad2 = 0; |
680 | di->__pad3 = 0; | |
294caaa3 SW |
681 | di->di_depth = 0; |
682 | di->di_entries = 0; | |
b96ca4fa | 683 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 684 | di->di_eattr = 0; |
b96ca4fa SW |
685 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
686 | ||
b3b94faa DT |
687 | brelse(dibh); |
688 | } | |
689 | ||
690 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 691 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 692 | const u64 *generation, dev_t dev) |
b3b94faa | 693 | { |
feaa7bba | 694 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
695 | unsigned int uid, gid; |
696 | int error; | |
697 | ||
698 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
699 | gfs2_alloc_get(dip); |
700 | ||
701 | error = gfs2_quota_lock(dip, uid, gid); | |
702 | if (error) | |
703 | goto out; | |
704 | ||
705 | error = gfs2_quota_check(dip, uid, gid); | |
706 | if (error) | |
707 | goto out_quota; | |
708 | ||
feaa7bba | 709 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
710 | if (error) |
711 | goto out_quota; | |
712 | ||
e7f14f4d | 713 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 714 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
715 | gfs2_trans_end(sdp); |
716 | ||
feaa7bba | 717 | out_quota: |
b3b94faa | 718 | gfs2_quota_unlock(dip); |
feaa7bba | 719 | out: |
b3b94faa | 720 | gfs2_alloc_put(dip); |
b3b94faa DT |
721 | return error; |
722 | } | |
723 | ||
feaa7bba SW |
724 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
725 | struct gfs2_inode *ip) | |
b3b94faa | 726 | { |
feaa7bba | 727 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
728 | struct gfs2_alloc *al; |
729 | int alloc_required; | |
730 | struct buffer_head *dibh; | |
731 | int error; | |
732 | ||
733 | al = gfs2_alloc_get(dip); | |
734 | ||
735 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
736 | if (error) | |
737 | goto fail; | |
738 | ||
feaa7bba | 739 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
740 | if (alloc_required < 0) |
741 | goto fail; | |
b3b94faa | 742 | if (alloc_required) { |
2933f925 | 743 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
744 | if (error) |
745 | goto fail_quota_locks; | |
746 | ||
747 | al->al_requested = sdp->sd_max_dirres; | |
748 | ||
749 | error = gfs2_inplace_reserve(dip); | |
750 | if (error) | |
751 | goto fail_quota_locks; | |
752 | ||
320dd101 | 753 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 754 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 755 | 2 * RES_DINODE + |
b3b94faa DT |
756 | RES_STATFS + RES_QUOTA, 0); |
757 | if (error) | |
758 | goto fail_ipreserv; | |
759 | } else { | |
feaa7bba | 760 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
761 | if (error) |
762 | goto fail_quota_locks; | |
763 | } | |
764 | ||
b60623c2 | 765 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
766 | if (error) |
767 | goto fail_end_trans; | |
768 | ||
769 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
770 | if (error) | |
771 | goto fail_end_trans; | |
4f56110a | 772 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 773 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 774 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 775 | brelse(dibh); |
b3b94faa DT |
776 | return 0; |
777 | ||
320dd101 | 778 | fail_end_trans: |
b3b94faa DT |
779 | gfs2_trans_end(sdp); |
780 | ||
320dd101 | 781 | fail_ipreserv: |
b3b94faa DT |
782 | if (dip->i_alloc.al_rgd) |
783 | gfs2_inplace_release(dip); | |
784 | ||
320dd101 | 785 | fail_quota_locks: |
b3b94faa DT |
786 | gfs2_quota_unlock(dip); |
787 | ||
320dd101 | 788 | fail: |
b3b94faa | 789 | gfs2_alloc_put(dip); |
b3b94faa DT |
790 | return error; |
791 | } | |
792 | ||
fcb47e0b RH |
793 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
794 | { | |
795 | int err; | |
796 | size_t len; | |
797 | void *value; | |
798 | char *name; | |
799 | struct gfs2_ea_request er; | |
800 | ||
801 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
802 | &name, &value, &len); | |
803 | ||
804 | if (err) { | |
805 | if (err == -EOPNOTSUPP) | |
806 | return 0; | |
807 | return err; | |
808 | } | |
809 | ||
810 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
811 | ||
812 | er.er_type = GFS2_EATYPE_SECURITY; | |
813 | er.er_name = name; | |
814 | er.er_data = value; | |
815 | er.er_name_len = strlen(name); | |
816 | er.er_data_len = len; | |
817 | ||
818 | err = gfs2_ea_set_i(ip, &er); | |
819 | ||
820 | kfree(value); | |
821 | kfree(name); | |
822 | ||
823 | return err; | |
824 | } | |
825 | ||
b3b94faa DT |
826 | /** |
827 | * gfs2_createi - Create a new inode | |
828 | * @ghs: An array of two holders | |
829 | * @name: The name of the new file | |
830 | * @mode: the permissions on the new inode | |
831 | * | |
832 | * @ghs[0] is an initialized holder for the directory | |
833 | * @ghs[1] is the holder for the inode lock | |
834 | * | |
7359a19c | 835 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
836 | * file are held. A transaction has been started and an inplace reservation |
837 | * is held, as well. | |
838 | * | |
7359a19c | 839 | * Returns: An inode |
b3b94faa DT |
840 | */ |
841 | ||
feaa7bba | 842 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 843 | unsigned int mode, dev_t dev) |
b3b94faa | 844 | { |
7359a19c | 845 | struct inode *inode; |
5c676f6d | 846 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
847 | struct inode *dir = &dip->i_inode; |
848 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 849 | struct gfs2_inum_host inum; |
b3b94faa | 850 | int error; |
4340fe62 | 851 | u64 generation; |
b3b94faa DT |
852 | |
853 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 854 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 855 | |
b3b94faa DT |
856 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
857 | error = gfs2_glock_nq(ghs); | |
858 | if (error) | |
859 | goto fail; | |
860 | ||
861 | error = create_ok(dip, name, mode); | |
862 | if (error) | |
863 | goto fail_gunlock; | |
864 | ||
feaa7bba | 865 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
866 | if (error) |
867 | goto fail_gunlock; | |
868 | ||
4340fe62 | 869 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
870 | if (error) |
871 | goto fail_gunlock; | |
872 | ||
28626e20 SW |
873 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
874 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
875 | if (error) | |
876 | goto fail_gunlock; | |
b3b94faa | 877 | |
e7f14f4d | 878 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
879 | if (error) |
880 | goto fail_gunlock2; | |
881 | ||
feaa7bba SW |
882 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
883 | if (IS_ERR(inode)) | |
b3b94faa DT |
884 | goto fail_gunlock2; |
885 | ||
feaa7bba | 886 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
887 | if (error) |
888 | goto fail_iput; | |
889 | ||
feaa7bba | 890 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
891 | if (error) |
892 | goto fail_iput; | |
893 | ||
fcb47e0b RH |
894 | error = gfs2_security_init(dip, GFS2_I(inode)); |
895 | if (error) | |
896 | goto fail_iput; | |
897 | ||
feaa7bba | 898 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
899 | if (error) |
900 | goto fail_iput; | |
901 | ||
7359a19c SW |
902 | if (!inode) |
903 | return ERR_PTR(-ENOMEM); | |
904 | return inode; | |
b3b94faa | 905 | |
320dd101 | 906 | fail_iput: |
feaa7bba | 907 | iput(inode); |
320dd101 | 908 | fail_gunlock2: |
b3b94faa | 909 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 910 | fail_gunlock: |
b3b94faa | 911 | gfs2_glock_dq(ghs); |
320dd101 | 912 | fail: |
7359a19c | 913 | return ERR_PTR(error); |
b3b94faa DT |
914 | } |
915 | ||
b3b94faa DT |
916 | /** |
917 | * gfs2_rmdiri - Remove a directory | |
918 | * @dip: The parent directory of the directory to be removed | |
919 | * @name: The name of the directory to be removed | |
920 | * @ip: The GFS2 inode of the directory to be removed | |
921 | * | |
922 | * Assumes Glocks on dip and ip are held | |
923 | * | |
924 | * Returns: errno | |
925 | */ | |
926 | ||
feaa7bba SW |
927 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
928 | struct gfs2_inode *ip) | |
b3b94faa | 929 | { |
b3b94faa DT |
930 | struct qstr dotname; |
931 | int error; | |
932 | ||
933 | if (ip->i_di.di_entries != 2) { | |
934 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 935 | gfs2_dinode_print(ip); |
b3b94faa DT |
936 | return -EIO; |
937 | } | |
938 | ||
939 | error = gfs2_dir_del(dip, name); | |
940 | if (error) | |
941 | return error; | |
942 | ||
943 | error = gfs2_change_nlink(dip, -1); | |
944 | if (error) | |
945 | return error; | |
946 | ||
71b86f56 | 947 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
948 | error = gfs2_dir_del(ip, &dotname); |
949 | if (error) | |
950 | return error; | |
951 | ||
feaa7bba | 952 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
953 | error = gfs2_dir_del(ip, &dotname); |
954 | if (error) | |
955 | return error; | |
956 | ||
4f56110a SW |
957 | /* It looks odd, but it really should be done twice */ |
958 | error = gfs2_change_nlink(ip, -1); | |
959 | if (error) | |
960 | return error; | |
961 | ||
962 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
963 | if (error) |
964 | return error; | |
965 | ||
b3b94faa DT |
966 | return error; |
967 | } | |
968 | ||
969 | /* | |
970 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
971 | * @dip: the directory | |
972 | * @name: the name of the file | |
973 | * @ip: the inode | |
974 | * | |
975 | * Assumes that the lock on (at least) @dip is held. | |
976 | * | |
977 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
978 | */ | |
979 | ||
feaa7bba | 980 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
981 | struct gfs2_inode *ip) |
982 | { | |
629a21e7 | 983 | struct gfs2_inum_host inum; |
b3b94faa DT |
984 | unsigned int type; |
985 | int error; | |
986 | ||
feaa7bba | 987 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
988 | return -EPERM; |
989 | ||
b60623c2 | 990 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
991 | dip->i_inode.i_uid != current->fsuid && |
992 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
993 | return -EPERM; |
994 | ||
feaa7bba | 995 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
996 | return -EPERM; |
997 | ||
faf450ef | 998 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
999 | if (error) |
1000 | return error; | |
1001 | ||
feaa7bba | 1002 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1003 | if (error) |
1004 | return error; | |
1005 | ||
1006 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1007 | return -ENOENT; | |
1008 | ||
b60623c2 | 1009 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
1010 | gfs2_consist_inode(dip); |
1011 | return -EIO; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1019 | * @this: move this | |
1020 | * @to: to here | |
1021 | * | |
1022 | * Follow @to back to the root and make sure we don't encounter @this | |
1023 | * Assumes we already hold the rename lock. | |
1024 | * | |
1025 | * Returns: errno | |
1026 | */ | |
1027 | ||
1028 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1029 | { | |
feaa7bba | 1030 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1031 | struct super_block *sb = dir->i_sb; |
7359a19c | 1032 | struct inode *tmp; |
b3b94faa DT |
1033 | struct qstr dotdot; |
1034 | int error = 0; | |
1035 | ||
71b86f56 | 1036 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1037 | |
7359a19c | 1038 | igrab(dir); |
b3b94faa DT |
1039 | |
1040 | for (;;) { | |
feaa7bba | 1041 | if (dir == &this->i_inode) { |
b3b94faa DT |
1042 | error = -EINVAL; |
1043 | break; | |
1044 | } | |
c9fd4307 | 1045 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1046 | error = 0; |
1047 | break; | |
1048 | } | |
1049 | ||
c752666c SW |
1050 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1051 | if (IS_ERR(tmp)) { | |
1052 | error = PTR_ERR(tmp); | |
b3b94faa | 1053 | break; |
c752666c | 1054 | } |
b3b94faa | 1055 | |
7359a19c SW |
1056 | iput(dir); |
1057 | dir = tmp; | |
b3b94faa DT |
1058 | } |
1059 | ||
7359a19c | 1060 | iput(dir); |
b3b94faa DT |
1061 | |
1062 | return error; | |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * gfs2_readlinki - return the contents of a symlink | |
1067 | * @ip: the symlink's inode | |
1068 | * @buf: a pointer to the buffer to be filled | |
1069 | * @len: a pointer to the length of @buf | |
1070 | * | |
1071 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1072 | * to be freed by the caller. | |
1073 | * | |
1074 | * Returns: errno | |
1075 | */ | |
1076 | ||
1077 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1078 | { | |
1079 | struct gfs2_holder i_gh; | |
1080 | struct buffer_head *dibh; | |
1081 | unsigned int x; | |
1082 | int error; | |
1083 | ||
1084 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1085 | error = gfs2_glock_nq_atime(&i_gh); | |
1086 | if (error) { | |
1087 | gfs2_holder_uninit(&i_gh); | |
1088 | return error; | |
1089 | } | |
1090 | ||
1091 | if (!ip->i_di.di_size) { | |
1092 | gfs2_consist_inode(ip); | |
1093 | error = -EIO; | |
1094 | goto out; | |
1095 | } | |
1096 | ||
1097 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1098 | if (error) | |
1099 | goto out; | |
1100 | ||
1101 | x = ip->i_di.di_size + 1; | |
1102 | if (x > *len) { | |
1103 | *buf = kmalloc(x, GFP_KERNEL); | |
1104 | if (!*buf) { | |
1105 | error = -ENOMEM; | |
1106 | goto out_brelse; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1111 | *len = x; | |
1112 | ||
feaa7bba | 1113 | out_brelse: |
b3b94faa | 1114 | brelse(dibh); |
feaa7bba | 1115 | out: |
b3b94faa | 1116 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1117 | return error; |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1122 | * conditionally update the inode's atime | |
1123 | * @gh: the holder to acquire | |
1124 | * | |
1125 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1126 | * Update if the difference between the current time and the inode's current | |
1127 | * atime is greater than an interval specified at mount. | |
1128 | * | |
1129 | * Returns: errno | |
1130 | */ | |
1131 | ||
1132 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1133 | { | |
1134 | struct gfs2_glock *gl = gh->gh_gl; | |
1135 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1136 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1137 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1138 | unsigned int state; |
1139 | int flags; | |
1140 | int error; | |
1141 | ||
1142 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1143 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1144 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1145 | return -EINVAL; | |
1146 | ||
1147 | state = gh->gh_state; | |
1148 | flags = gh->gh_flags; | |
1149 | ||
1150 | error = gfs2_glock_nq(gh); | |
1151 | if (error) | |
1152 | return error; | |
1153 | ||
1154 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1155 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1156 | return 0; | |
1157 | ||
1158 | curtime = get_seconds(); | |
1a7b1eed | 1159 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1160 | gfs2_glock_dq(gh); |
fd88de56 SW |
1161 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1162 | gh); | |
b3b94faa DT |
1163 | error = gfs2_glock_nq(gh); |
1164 | if (error) | |
1165 | return error; | |
1166 | ||
1167 | /* Verify that atime hasn't been updated while we were | |
1168 | trying to get exclusive lock. */ | |
1169 | ||
1170 | curtime = get_seconds(); | |
1a7b1eed | 1171 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1172 | struct buffer_head *dibh; |
48516ced | 1173 | struct gfs2_dinode *di; |
b3b94faa DT |
1174 | |
1175 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1176 | if (error == -EROFS) | |
1177 | return 0; | |
1178 | if (error) | |
1179 | goto fail; | |
1180 | ||
1181 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1182 | if (error) | |
1183 | goto fail_end_trans; | |
1184 | ||
1a7b1eed | 1185 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1186 | |
d4e9c4c3 | 1187 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1188 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1189 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1190 | brelse(dibh); |
1191 | ||
1192 | gfs2_trans_end(sdp); | |
1193 | } | |
1194 | ||
1195 | /* If someone else has asked for the glock, | |
1196 | unlock and let them have it. Then reacquire | |
1197 | in the original state. */ | |
1198 | if (gfs2_glock_is_blocking(gl)) { | |
1199 | gfs2_glock_dq(gh); | |
1200 | gfs2_holder_reinit(state, flags, gh); | |
1201 | return gfs2_glock_nq(gh); | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | return 0; | |
1206 | ||
feaa7bba | 1207 | fail_end_trans: |
b3b94faa | 1208 | gfs2_trans_end(sdp); |
feaa7bba | 1209 | fail: |
b3b94faa | 1210 | gfs2_glock_dq(gh); |
b3b94faa DT |
1211 | return error; |
1212 | } | |
1213 | ||
b3b94faa DT |
1214 | static int |
1215 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1216 | { | |
1217 | struct buffer_head *dibh; | |
1218 | int error; | |
1219 | ||
1220 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1221 | if (!error) { | |
feaa7bba SW |
1222 | error = inode_setattr(&ip->i_inode, attr); |
1223 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1224 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1225 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1226 | brelse(dibh); |
1227 | } | |
1228 | return error; | |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * gfs2_setattr_simple - | |
1233 | * @ip: | |
1234 | * @attr: | |
1235 | * | |
1236 | * Called with a reference on the vnode. | |
1237 | * | |
1238 | * Returns: errno | |
1239 | */ | |
1240 | ||
1241 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1242 | { | |
1243 | int error; | |
1244 | ||
5c676f6d | 1245 | if (current->journal_info) |
b3b94faa DT |
1246 | return __gfs2_setattr_simple(ip, attr); |
1247 | ||
feaa7bba | 1248 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1249 | if (error) |
1250 | return error; | |
1251 | ||
1252 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1253 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1254 | return error; |
1255 | } | |
1256 |