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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); | |
dbb7cae2 | 44 | u64 *no_addr = opaque; |
feaa7bba | 45 | |
dbb7cae2 | 46 | if (ip->i_no_addr == *no_addr && |
1be38679 | 47 | inode->i_private != NULL) |
feaa7bba | 48 | return 1; |
b3b94faa | 49 | |
feaa7bba SW |
50 | return 0; |
51 | } | |
52 | ||
53 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 54 | { |
feaa7bba | 55 | struct gfs2_inode *ip = GFS2_I(inode); |
dbb7cae2 | 56 | u64 *no_addr = opaque; |
b3b94faa | 57 | |
dbb7cae2 SW |
58 | inode->i_ino = (unsigned long)*no_addr; |
59 | ip->i_no_addr = *no_addr; | |
feaa7bba SW |
60 | return 0; |
61 | } | |
b3b94faa | 62 | |
dbb7cae2 | 63 | struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr) |
feaa7bba | 64 | { |
dbb7cae2 SW |
65 | unsigned long hash = (unsigned long)no_addr; |
66 | return ilookup5(sb, hash, iget_test, &no_addr); | |
feaa7bba | 67 | } |
b3b94faa | 68 | |
dbb7cae2 | 69 | static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) |
feaa7bba | 70 | { |
dbb7cae2 SW |
71 | unsigned long hash = (unsigned long)no_addr; |
72 | return iget5_locked(sb, hash, iget_test, iget_set, &no_addr); | |
b3b94faa DT |
73 | } |
74 | ||
75 | /** | |
feaa7bba SW |
76 | * gfs2_inode_lookup - Lookup an inode |
77 | * @sb: The super block | |
dbb7cae2 | 78 | * @no_addr: The inode number |
feaa7bba | 79 | * @type: The type of the inode |
b3b94faa | 80 | * |
feaa7bba | 81 | * Returns: A VFS inode, or an error |
b3b94faa DT |
82 | */ |
83 | ||
dbb7cae2 | 84 | struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned int type) |
b3b94faa | 85 | { |
dbb7cae2 | 86 | struct inode *inode = gfs2_iget(sb, no_addr); |
feaa7bba SW |
87 | struct gfs2_inode *ip = GFS2_I(inode); |
88 | struct gfs2_glock *io_gl; | |
89 | int error; | |
b3b94faa | 90 | |
26d83ded SW |
91 | if (!inode) |
92 | return ERR_PTR(-ENOBUFS); | |
93 | ||
feaa7bba SW |
94 | if (inode->i_state & I_NEW) { |
95 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
96 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 97 | inode->i_private = ip; |
feaa7bba SW |
98 | inode->i_mode = mode; |
99 | ||
100 | if (S_ISREG(mode)) { | |
101 | inode->i_op = &gfs2_file_iops; | |
102 | inode->i_fop = &gfs2_file_fops; | |
103 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
104 | } else if (S_ISDIR(mode)) { | |
105 | inode->i_op = &gfs2_dir_iops; | |
106 | inode->i_fop = &gfs2_dir_fops; | |
107 | } else if (S_ISLNK(mode)) { | |
108 | inode->i_op = &gfs2_symlink_iops; | |
109 | } else { | |
110 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 111 | } |
b3b94faa | 112 | |
dbb7cae2 | 113 | error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
feaa7bba SW |
114 | if (unlikely(error)) |
115 | goto fail; | |
116 | ip->i_gl->gl_object = ip; | |
b3b94faa | 117 | |
dbb7cae2 | 118 | error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
feaa7bba SW |
119 | if (unlikely(error)) |
120 | goto fail_put; | |
b3b94faa | 121 | |
bfded27b | 122 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
123 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
124 | if (unlikely(error)) | |
125 | goto fail_iopen; | |
b3b94faa | 126 | |
feaa7bba SW |
127 | gfs2_glock_put(io_gl); |
128 | unlock_new_inode(inode); | |
129 | } | |
b3b94faa DT |
130 | |
131 | return inode; | |
feaa7bba SW |
132 | fail_iopen: |
133 | gfs2_glock_put(io_gl); | |
134 | fail_put: | |
135 | ip->i_gl->gl_object = NULL; | |
136 | gfs2_glock_put(ip->i_gl); | |
137 | fail: | |
138 | iput(inode); | |
139 | return ERR_PTR(error); | |
b3b94faa DT |
140 | } |
141 | ||
af339c02 | 142 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
143 | { |
144 | struct gfs2_dinode_host *di = &ip->i_di; | |
145 | const struct gfs2_dinode *str = buf; | |
146 | ||
dbb7cae2 | 147 | if (ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)) { |
af339c02 SW |
148 | if (gfs2_consist_inode(ip)) |
149 | gfs2_dinode_print(ip); | |
150 | return -EIO; | |
151 | } | |
dbb7cae2 | 152 | ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); |
b60623c2 | 153 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 154 | ip->i_inode.i_rdev = 0; |
b60623c2 | 155 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
156 | case S_IFBLK: |
157 | case S_IFCHR: | |
158 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
159 | be32_to_cpu(str->di_minor)); | |
160 | break; | |
161 | }; | |
162 | ||
2933f925 SW |
163 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
164 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
165 | /* |
166 | * We will need to review setting the nlink count here in the | |
167 | * light of the forthcoming ro bind mount work. This is a reminder | |
168 | * to do that. | |
169 | */ | |
170 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 | 171 | di->di_size = be64_to_cpu(str->di_size); |
9e2dbdac | 172 | i_size_write(&ip->i_inode, di->di_size); |
ea744d01 | 173 | di->di_blocks = be64_to_cpu(str->di_blocks); |
9e2dbdac | 174 | gfs2_set_inode_blocks(&ip->i_inode); |
1a7b1eed SW |
175 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
176 | ip->i_inode.i_atime.tv_nsec = 0; | |
177 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); | |
178 | ip->i_inode.i_mtime.tv_nsec = 0; | |
179 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); | |
180 | ip->i_inode.i_ctime.tv_nsec = 0; | |
ea744d01 SW |
181 | |
182 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
183 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
184 | di->di_generation = be64_to_cpu(str->di_generation); | |
185 | ||
186 | di->di_flags = be32_to_cpu(str->di_flags); | |
6b124d8d | 187 | gfs2_set_inode_flags(&ip->i_inode); |
ea744d01 SW |
188 | di->di_height = be16_to_cpu(str->di_height); |
189 | ||
190 | di->di_depth = be16_to_cpu(str->di_depth); | |
191 | di->di_entries = be32_to_cpu(str->di_entries); | |
192 | ||
193 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 194 | return 0; |
ea744d01 SW |
195 | } |
196 | ||
b3b94faa DT |
197 | /** |
198 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
199 | * @ip: The GFS2 inode | |
200 | * | |
201 | * Returns: errno | |
202 | */ | |
203 | ||
204 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
205 | { | |
206 | struct buffer_head *dibh; | |
207 | int error; | |
208 | ||
209 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
210 | if (error) | |
211 | return error; | |
212 | ||
feaa7bba | 213 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
214 | brelse(dibh); |
215 | return -EIO; | |
216 | } | |
217 | ||
af339c02 | 218 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 219 | brelse(dibh); |
bfded27b | 220 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 221 | |
af339c02 | 222 | return error; |
b3b94faa DT |
223 | } |
224 | ||
feaa7bba | 225 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 226 | { |
feaa7bba | 227 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
228 | struct gfs2_alloc *al; |
229 | struct gfs2_rgrpd *rgd; | |
230 | int error; | |
231 | ||
232 | if (ip->i_di.di_blocks != 1) { | |
233 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 234 | gfs2_dinode_print(ip); |
b3b94faa DT |
235 | return -EIO; |
236 | } | |
237 | ||
238 | al = gfs2_alloc_get(ip); | |
239 | ||
240 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
241 | if (error) | |
242 | goto out; | |
243 | ||
244 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
245 | if (error) | |
246 | goto out_qs; | |
247 | ||
dbb7cae2 | 248 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
b3b94faa DT |
249 | if (!rgd) { |
250 | gfs2_consist_inode(ip); | |
251 | error = -EIO; | |
252 | goto out_rindex_relse; | |
253 | } | |
254 | ||
255 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
256 | &al->al_rgd_gh); | |
257 | if (error) | |
258 | goto out_rindex_relse; | |
259 | ||
420b9e5e | 260 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
261 | if (error) |
262 | goto out_rg_gunlock; | |
263 | ||
264 | gfs2_trans_add_gl(ip->i_gl); | |
265 | ||
266 | gfs2_free_di(rgd, ip); | |
267 | ||
b3b94faa DT |
268 | gfs2_trans_end(sdp); |
269 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
270 | ||
feaa7bba | 271 | out_rg_gunlock: |
b3b94faa | 272 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 273 | out_rindex_relse: |
b3b94faa | 274 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 275 | out_qs: |
b3b94faa | 276 | gfs2_quota_unhold(ip); |
36327521 | 277 | out: |
feaa7bba | 278 | gfs2_alloc_put(ip); |
b3b94faa DT |
279 | return error; |
280 | } | |
281 | ||
b3b94faa | 282 | /** |
87d21e07 | 283 | * gfs2_change_nlink - Change nlink count on inode |
b3b94faa DT |
284 | * @ip: The GFS2 inode |
285 | * @diff: The change in the nlink count required | |
286 | * | |
287 | * Returns: errno | |
288 | */ | |
87d21e07 | 289 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
b3b94faa DT |
290 | { |
291 | struct buffer_head *dibh; | |
cd915493 | 292 | u32 nlink; |
b3b94faa DT |
293 | int error; |
294 | ||
4f56110a SW |
295 | BUG_ON(diff != 1 && diff != -1); |
296 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
297 | |
298 | /* If we are reducing the nlink count, but the new value ends up being | |
299 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 300 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 301 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 302 | gfs2_dinode_print(ip); |
b3b94faa DT |
303 | return -EIO; |
304 | } | |
305 | ||
306 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
307 | if (error) | |
308 | return error; | |
309 | ||
4f56110a SW |
310 | if (diff > 0) |
311 | inc_nlink(&ip->i_inode); | |
312 | else | |
313 | drop_nlink(&ip->i_inode); | |
314 | ||
ddfe0627 | 315 | ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa | 316 | |
d4e9c4c3 | 317 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 318 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 319 | brelse(dibh); |
feaa7bba | 320 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 321 | |
87d21e07 | 322 | if (ip->i_inode.i_nlink == 0) |
ddee7608 | 323 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
87d21e07 | 324 | |
5509826f WC |
325 | return error; |
326 | } | |
327 | ||
c752666c SW |
328 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
329 | { | |
330 | struct qstr qstr; | |
6c93fd1e | 331 | struct inode *inode; |
71b86f56 | 332 | gfs2_str2qstr(&qstr, name); |
6c93fd1e RC |
333 | inode = gfs2_lookupi(dip, &qstr, 1, NULL); |
334 | /* gfs2_lookupi has inconsistent callers: vfs | |
335 | * related routines expect NULL for no entry found, | |
336 | * gfs2_lookup_simple callers expect ENOENT | |
337 | * and do not check for NULL. | |
338 | */ | |
339 | if (inode == NULL) | |
340 | return ERR_PTR(-ENOENT); | |
341 | else | |
342 | return inode; | |
c752666c SW |
343 | } |
344 | ||
345 | ||
b3b94faa DT |
346 | /** |
347 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
348 | * @d_gh: An initialized holder for the directory glock | |
349 | * @name: The name of the inode to look for | |
350 | * @is_root: If 1, ignore the caller's permissions | |
351 | * @i_gh: An uninitialized holder for the new inode glock | |
352 | * | |
d7c103d0 SW |
353 | * This can be called via the VFS filldir function when NFS is doing |
354 | * a readdirplus and the inode which its intending to stat isn't | |
355 | * already in cache. In this case we must not take the directory glock | |
356 | * again, since the readdir call will have already taken that lock. | |
b3b94faa DT |
357 | * |
358 | * Returns: errno | |
359 | */ | |
360 | ||
feaa7bba SW |
361 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
362 | int is_root, struct nameidata *nd) | |
b3b94faa | 363 | { |
c9fd4307 | 364 | struct super_block *sb = dir->i_sb; |
feaa7bba | 365 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 366 | struct gfs2_holder d_gh; |
d7c103d0 | 367 | int error; |
c752666c | 368 | struct inode *inode = NULL; |
d7c103d0 | 369 | int unlock = 0; |
b3b94faa DT |
370 | |
371 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 372 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 373 | |
c752666c SW |
374 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
375 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
376 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
377 | igrab(dir); |
378 | return dir; | |
b3b94faa DT |
379 | } |
380 | ||
d7c103d0 SW |
381 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) { |
382 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
383 | if (error) | |
384 | return ERR_PTR(error); | |
385 | unlock = 1; | |
386 | } | |
b3b94faa DT |
387 | |
388 | if (!is_root) { | |
faf450ef | 389 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
390 | if (error) |
391 | goto out; | |
392 | } | |
393 | ||
dbb7cae2 SW |
394 | inode = gfs2_dir_search(dir, name); |
395 | if (IS_ERR(inode)) | |
396 | error = PTR_ERR(inode); | |
7359a19c | 397 | out: |
d7c103d0 SW |
398 | if (unlock) |
399 | gfs2_glock_dq_uninit(&d_gh); | |
c752666c SW |
400 | if (error == -ENOENT) |
401 | return NULL; | |
d7c103d0 | 402 | return inode ? inode : ERR_PTR(error); |
b3b94faa DT |
403 | } |
404 | ||
cd915493 | 405 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 406 | { |
feaa7bba | 407 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 408 | struct buffer_head *bh; |
e6972647 | 409 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
410 | int error; |
411 | ||
412 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
413 | if (error) | |
414 | return error; | |
f55ab26a | 415 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
416 | |
417 | error = gfs2_meta_inode_buffer(ip, &bh); | |
418 | if (error) { | |
f55ab26a | 419 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
420 | gfs2_trans_end(sdp); |
421 | return error; | |
422 | } | |
423 | ||
424 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
425 | ||
426 | if (ir.ir_length) { | |
427 | *formal_ino = ir.ir_start++; | |
428 | ir.ir_length--; | |
d4e9c4c3 | 429 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
430 | gfs2_inum_range_out(&ir, |
431 | bh->b_data + sizeof(struct gfs2_dinode)); | |
432 | brelse(bh); | |
f55ab26a | 433 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
434 | gfs2_trans_end(sdp); |
435 | return 0; | |
436 | } | |
437 | ||
438 | brelse(bh); | |
439 | ||
f55ab26a | 440 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
441 | gfs2_trans_end(sdp); |
442 | ||
443 | return 1; | |
444 | } | |
445 | ||
cd915493 | 446 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 447 | { |
feaa7bba SW |
448 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
449 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
450 | struct gfs2_holder gh; |
451 | struct buffer_head *bh; | |
e6972647 | 452 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
453 | int error; |
454 | ||
455 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
456 | if (error) | |
457 | return error; | |
458 | ||
459 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
460 | if (error) | |
461 | goto out; | |
f55ab26a | 462 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
463 | |
464 | error = gfs2_meta_inode_buffer(ip, &bh); | |
465 | if (error) | |
466 | goto out_end_trans; | |
907b9bce | 467 | |
b3b94faa DT |
468 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
469 | ||
470 | if (!ir.ir_length) { | |
471 | struct buffer_head *m_bh; | |
cd915493 | 472 | u64 x, y; |
b44b84d7 | 473 | __be64 z; |
b3b94faa DT |
474 | |
475 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
476 | if (error) | |
477 | goto out_brelse; | |
478 | ||
b44b84d7 AV |
479 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
480 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
481 | ir.ir_start = x; |
482 | ir.ir_length = GFS2_INUM_QUANTUM; | |
483 | x += GFS2_INUM_QUANTUM; | |
484 | if (x < y) | |
485 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 486 | z = cpu_to_be64(x); |
d4e9c4c3 | 487 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 488 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
489 | |
490 | brelse(m_bh); | |
491 | } | |
492 | ||
493 | *formal_ino = ir.ir_start++; | |
494 | ir.ir_length--; | |
495 | ||
d4e9c4c3 | 496 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
497 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
498 | ||
420b9e5e | 499 | out_brelse: |
b3b94faa | 500 | brelse(bh); |
420b9e5e | 501 | out_end_trans: |
f55ab26a | 502 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 503 | gfs2_trans_end(sdp); |
420b9e5e | 504 | out: |
b3b94faa | 505 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
506 | return error; |
507 | } | |
508 | ||
cd915493 | 509 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
510 | { |
511 | int error; | |
512 | ||
513 | error = pick_formal_ino_1(sdp, inum); | |
514 | if (error <= 0) | |
515 | return error; | |
516 | ||
517 | error = pick_formal_ino_2(sdp, inum); | |
518 | ||
519 | return error; | |
520 | } | |
521 | ||
522 | /** | |
523 | * create_ok - OK to create a new on-disk inode here? | |
524 | * @dip: Directory in which dinode is to be created | |
525 | * @name: Name of new dinode | |
526 | * @mode: | |
527 | * | |
528 | * Returns: errno | |
529 | */ | |
530 | ||
feaa7bba | 531 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
532 | unsigned int mode) |
533 | { | |
534 | int error; | |
535 | ||
faf450ef | 536 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
537 | if (error) |
538 | return error; | |
539 | ||
540 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 541 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
542 | return -EPERM; |
543 | ||
dbb7cae2 | 544 | error = gfs2_dir_check(&dip->i_inode, name, NULL); |
b3b94faa DT |
545 | switch (error) { |
546 | case -ENOENT: | |
547 | error = 0; | |
548 | break; | |
549 | case 0: | |
550 | return -EEXIST; | |
551 | default: | |
552 | return error; | |
553 | } | |
554 | ||
cd915493 | 555 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 556 | return -EFBIG; |
4f56110a | 557 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
558 | return -EMLINK; |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
564 | unsigned int *uid, unsigned int *gid) | |
565 | { | |
feaa7bba | 566 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 567 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
568 | if (S_ISDIR(*mode)) |
569 | *mode |= S_ISUID; | |
2933f925 | 570 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 571 | *mode &= ~07111; |
2933f925 | 572 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
573 | } else |
574 | *uid = current->fsuid; | |
575 | ||
b60623c2 | 576 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
577 | if (S_ISDIR(*mode)) |
578 | *mode |= S_ISGID; | |
2933f925 | 579 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
580 | } else |
581 | *gid = current->fsgid; | |
582 | } | |
583 | ||
dbb7cae2 | 584 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) |
b3b94faa | 585 | { |
feaa7bba | 586 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
587 | int error; |
588 | ||
589 | gfs2_alloc_get(dip); | |
590 | ||
591 | dip->i_alloc.al_requested = RES_DINODE; | |
592 | error = gfs2_inplace_reserve(dip); | |
593 | if (error) | |
594 | goto out; | |
595 | ||
feaa7bba | 596 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
597 | if (error) |
598 | goto out_ipreserv; | |
599 | ||
dbb7cae2 | 600 | *no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
601 | |
602 | gfs2_trans_end(sdp); | |
603 | ||
4340fe62 | 604 | out_ipreserv: |
b3b94faa | 605 | gfs2_inplace_release(dip); |
4340fe62 | 606 | out: |
b3b94faa | 607 | gfs2_alloc_put(dip); |
b3b94faa DT |
608 | return error; |
609 | } | |
610 | ||
611 | /** | |
612 | * init_dinode - Fill in a new dinode structure | |
613 | * @dip: the directory this inode is being created in | |
614 | * @gl: The glock covering the new inode | |
615 | * @inum: the inode number | |
616 | * @mode: the file permissions | |
617 | * @uid: | |
618 | * @gid: | |
619 | * | |
620 | */ | |
621 | ||
622 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 623 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 624 | unsigned int uid, unsigned int gid, |
e7f14f4d | 625 | const u64 *generation, dev_t dev) |
b3b94faa | 626 | { |
feaa7bba | 627 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 628 | struct gfs2_dinode *di; |
b3b94faa DT |
629 | struct buffer_head *dibh; |
630 | ||
631 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 632 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
633 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
634 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
635 | di = (struct gfs2_dinode *)dibh->b_data; |
636 | ||
2442a098 SW |
637 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
638 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
639 | di->di_mode = cpu_to_be32(mode); |
640 | di->di_uid = cpu_to_be32(uid); | |
641 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
642 | di->di_nlink = 0; |
643 | di->di_size = 0; | |
b96ca4fa SW |
644 | di->di_blocks = cpu_to_be64(1); |
645 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
646 | di->di_major = cpu_to_be32(MAJOR(dev)); |
647 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 648 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 649 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 650 | di->di_flags = 0; |
b3b94faa DT |
651 | |
652 | if (S_ISREG(mode)) { | |
653 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
654 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 655 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
656 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
657 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 658 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 659 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
660 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
661 | GFS2_DIF_INHERIT_DIRECTIO); | |
662 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
663 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
664 | } |
665 | ||
b96ca4fa | 666 | di->__pad1 = 0; |
a9583c79 | 667 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 668 | di->di_height = 0; |
b96ca4fa SW |
669 | di->__pad2 = 0; |
670 | di->__pad3 = 0; | |
294caaa3 SW |
671 | di->di_depth = 0; |
672 | di->di_entries = 0; | |
b96ca4fa | 673 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 674 | di->di_eattr = 0; |
b96ca4fa SW |
675 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
676 | ||
b3b94faa DT |
677 | brelse(dibh); |
678 | } | |
679 | ||
680 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 681 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 682 | const u64 *generation, dev_t dev) |
b3b94faa | 683 | { |
feaa7bba | 684 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
685 | unsigned int uid, gid; |
686 | int error; | |
687 | ||
688 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
689 | gfs2_alloc_get(dip); |
690 | ||
691 | error = gfs2_quota_lock(dip, uid, gid); | |
692 | if (error) | |
693 | goto out; | |
694 | ||
695 | error = gfs2_quota_check(dip, uid, gid); | |
696 | if (error) | |
697 | goto out_quota; | |
698 | ||
feaa7bba | 699 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
700 | if (error) |
701 | goto out_quota; | |
702 | ||
e7f14f4d | 703 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 704 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
705 | gfs2_trans_end(sdp); |
706 | ||
feaa7bba | 707 | out_quota: |
b3b94faa | 708 | gfs2_quota_unlock(dip); |
feaa7bba | 709 | out: |
b3b94faa | 710 | gfs2_alloc_put(dip); |
b3b94faa DT |
711 | return error; |
712 | } | |
713 | ||
feaa7bba SW |
714 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
715 | struct gfs2_inode *ip) | |
b3b94faa | 716 | { |
feaa7bba | 717 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
718 | struct gfs2_alloc *al; |
719 | int alloc_required; | |
720 | struct buffer_head *dibh; | |
721 | int error; | |
722 | ||
723 | al = gfs2_alloc_get(dip); | |
724 | ||
725 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
726 | if (error) | |
727 | goto fail; | |
728 | ||
feaa7bba | 729 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
730 | if (alloc_required < 0) |
731 | goto fail; | |
b3b94faa | 732 | if (alloc_required) { |
2933f925 | 733 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
734 | if (error) |
735 | goto fail_quota_locks; | |
736 | ||
737 | al->al_requested = sdp->sd_max_dirres; | |
738 | ||
739 | error = gfs2_inplace_reserve(dip); | |
740 | if (error) | |
741 | goto fail_quota_locks; | |
742 | ||
320dd101 | 743 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 744 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 745 | 2 * RES_DINODE + |
b3b94faa DT |
746 | RES_STATFS + RES_QUOTA, 0); |
747 | if (error) | |
748 | goto fail_ipreserv; | |
749 | } else { | |
feaa7bba | 750 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
751 | if (error) |
752 | goto fail_quota_locks; | |
753 | } | |
754 | ||
dbb7cae2 | 755 | error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
756 | if (error) |
757 | goto fail_end_trans; | |
758 | ||
759 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
760 | if (error) | |
761 | goto fail_end_trans; | |
4f56110a | 762 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 763 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 764 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 765 | brelse(dibh); |
b3b94faa DT |
766 | return 0; |
767 | ||
320dd101 | 768 | fail_end_trans: |
b3b94faa DT |
769 | gfs2_trans_end(sdp); |
770 | ||
320dd101 | 771 | fail_ipreserv: |
b3b94faa DT |
772 | if (dip->i_alloc.al_rgd) |
773 | gfs2_inplace_release(dip); | |
774 | ||
320dd101 | 775 | fail_quota_locks: |
b3b94faa DT |
776 | gfs2_quota_unlock(dip); |
777 | ||
320dd101 | 778 | fail: |
b3b94faa | 779 | gfs2_alloc_put(dip); |
b3b94faa DT |
780 | return error; |
781 | } | |
782 | ||
fcb47e0b RH |
783 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
784 | { | |
785 | int err; | |
786 | size_t len; | |
787 | void *value; | |
788 | char *name; | |
789 | struct gfs2_ea_request er; | |
790 | ||
791 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
792 | &name, &value, &len); | |
793 | ||
794 | if (err) { | |
795 | if (err == -EOPNOTSUPP) | |
796 | return 0; | |
797 | return err; | |
798 | } | |
799 | ||
800 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
801 | ||
802 | er.er_type = GFS2_EATYPE_SECURITY; | |
803 | er.er_name = name; | |
804 | er.er_data = value; | |
805 | er.er_name_len = strlen(name); | |
806 | er.er_data_len = len; | |
807 | ||
808 | err = gfs2_ea_set_i(ip, &er); | |
809 | ||
810 | kfree(value); | |
811 | kfree(name); | |
812 | ||
813 | return err; | |
814 | } | |
815 | ||
b3b94faa DT |
816 | /** |
817 | * gfs2_createi - Create a new inode | |
818 | * @ghs: An array of two holders | |
819 | * @name: The name of the new file | |
820 | * @mode: the permissions on the new inode | |
821 | * | |
822 | * @ghs[0] is an initialized holder for the directory | |
823 | * @ghs[1] is the holder for the inode lock | |
824 | * | |
7359a19c | 825 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
826 | * file are held. A transaction has been started and an inplace reservation |
827 | * is held, as well. | |
828 | * | |
7359a19c | 829 | * Returns: An inode |
b3b94faa DT |
830 | */ |
831 | ||
feaa7bba | 832 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 833 | unsigned int mode, dev_t dev) |
b3b94faa | 834 | { |
7359a19c | 835 | struct inode *inode; |
5c676f6d | 836 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
837 | struct inode *dir = &dip->i_inode; |
838 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
dbb7cae2 | 839 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; |
b3b94faa | 840 | int error; |
4340fe62 | 841 | u64 generation; |
b3b94faa DT |
842 | |
843 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 844 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 845 | |
b3b94faa DT |
846 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
847 | error = gfs2_glock_nq(ghs); | |
848 | if (error) | |
849 | goto fail; | |
850 | ||
851 | error = create_ok(dip, name, mode); | |
852 | if (error) | |
853 | goto fail_gunlock; | |
854 | ||
feaa7bba | 855 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
856 | if (error) |
857 | goto fail_gunlock; | |
858 | ||
dbb7cae2 | 859 | error = alloc_dinode(dip, &inum.no_addr, &generation); |
b3b94faa DT |
860 | if (error) |
861 | goto fail_gunlock; | |
862 | ||
28626e20 SW |
863 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
864 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
865 | if (error) | |
866 | goto fail_gunlock; | |
b3b94faa | 867 | |
e7f14f4d | 868 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
869 | if (error) |
870 | goto fail_gunlock2; | |
871 | ||
dbb7cae2 | 872 | inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode)); |
feaa7bba | 873 | if (IS_ERR(inode)) |
b3b94faa DT |
874 | goto fail_gunlock2; |
875 | ||
feaa7bba | 876 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
877 | if (error) |
878 | goto fail_iput; | |
879 | ||
feaa7bba | 880 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
881 | if (error) |
882 | goto fail_iput; | |
883 | ||
fcb47e0b RH |
884 | error = gfs2_security_init(dip, GFS2_I(inode)); |
885 | if (error) | |
886 | goto fail_iput; | |
887 | ||
feaa7bba | 888 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
889 | if (error) |
890 | goto fail_iput; | |
891 | ||
7359a19c SW |
892 | if (!inode) |
893 | return ERR_PTR(-ENOMEM); | |
894 | return inode; | |
b3b94faa | 895 | |
320dd101 | 896 | fail_iput: |
feaa7bba | 897 | iput(inode); |
320dd101 | 898 | fail_gunlock2: |
b3b94faa | 899 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 900 | fail_gunlock: |
b3b94faa | 901 | gfs2_glock_dq(ghs); |
320dd101 | 902 | fail: |
7359a19c | 903 | return ERR_PTR(error); |
b3b94faa DT |
904 | } |
905 | ||
b3b94faa DT |
906 | /** |
907 | * gfs2_rmdiri - Remove a directory | |
908 | * @dip: The parent directory of the directory to be removed | |
909 | * @name: The name of the directory to be removed | |
910 | * @ip: The GFS2 inode of the directory to be removed | |
911 | * | |
912 | * Assumes Glocks on dip and ip are held | |
913 | * | |
914 | * Returns: errno | |
915 | */ | |
916 | ||
feaa7bba SW |
917 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
918 | struct gfs2_inode *ip) | |
b3b94faa | 919 | { |
b3b94faa DT |
920 | struct qstr dotname; |
921 | int error; | |
922 | ||
923 | if (ip->i_di.di_entries != 2) { | |
924 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 925 | gfs2_dinode_print(ip); |
b3b94faa DT |
926 | return -EIO; |
927 | } | |
928 | ||
929 | error = gfs2_dir_del(dip, name); | |
930 | if (error) | |
931 | return error; | |
932 | ||
933 | error = gfs2_change_nlink(dip, -1); | |
934 | if (error) | |
935 | return error; | |
936 | ||
71b86f56 | 937 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
938 | error = gfs2_dir_del(ip, &dotname); |
939 | if (error) | |
940 | return error; | |
941 | ||
feaa7bba | 942 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
943 | error = gfs2_dir_del(ip, &dotname); |
944 | if (error) | |
945 | return error; | |
946 | ||
4f56110a SW |
947 | /* It looks odd, but it really should be done twice */ |
948 | error = gfs2_change_nlink(ip, -1); | |
949 | if (error) | |
950 | return error; | |
951 | ||
952 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
953 | if (error) |
954 | return error; | |
955 | ||
b3b94faa DT |
956 | return error; |
957 | } | |
958 | ||
959 | /* | |
960 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
961 | * @dip: the directory | |
962 | * @name: the name of the file | |
963 | * @ip: the inode | |
964 | * | |
965 | * Assumes that the lock on (at least) @dip is held. | |
966 | * | |
967 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
968 | */ | |
969 | ||
feaa7bba | 970 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
dbb7cae2 | 971 | const struct gfs2_inode *ip) |
b3b94faa | 972 | { |
b3b94faa DT |
973 | int error; |
974 | ||
feaa7bba | 975 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
976 | return -EPERM; |
977 | ||
b60623c2 | 978 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
979 | dip->i_inode.i_uid != current->fsuid && |
980 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
981 | return -EPERM; |
982 | ||
feaa7bba | 983 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
984 | return -EPERM; |
985 | ||
faf450ef | 986 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
987 | if (error) |
988 | return error; | |
989 | ||
dbb7cae2 | 990 | error = gfs2_dir_check(&dip->i_inode, name, ip); |
b3b94faa DT |
991 | if (error) |
992 | return error; | |
993 | ||
b3b94faa DT |
994 | return 0; |
995 | } | |
996 | ||
997 | /* | |
998 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
999 | * @this: move this | |
1000 | * @to: to here | |
1001 | * | |
1002 | * Follow @to back to the root and make sure we don't encounter @this | |
1003 | * Assumes we already hold the rename lock. | |
1004 | * | |
1005 | * Returns: errno | |
1006 | */ | |
1007 | ||
1008 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1009 | { | |
feaa7bba | 1010 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1011 | struct super_block *sb = dir->i_sb; |
7359a19c | 1012 | struct inode *tmp; |
b3b94faa DT |
1013 | struct qstr dotdot; |
1014 | int error = 0; | |
1015 | ||
71b86f56 | 1016 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1017 | |
7359a19c | 1018 | igrab(dir); |
b3b94faa DT |
1019 | |
1020 | for (;;) { | |
feaa7bba | 1021 | if (dir == &this->i_inode) { |
b3b94faa DT |
1022 | error = -EINVAL; |
1023 | break; | |
1024 | } | |
c9fd4307 | 1025 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1026 | error = 0; |
1027 | break; | |
1028 | } | |
1029 | ||
c752666c SW |
1030 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1031 | if (IS_ERR(tmp)) { | |
1032 | error = PTR_ERR(tmp); | |
b3b94faa | 1033 | break; |
c752666c | 1034 | } |
b3b94faa | 1035 | |
7359a19c SW |
1036 | iput(dir); |
1037 | dir = tmp; | |
b3b94faa DT |
1038 | } |
1039 | ||
7359a19c | 1040 | iput(dir); |
b3b94faa DT |
1041 | |
1042 | return error; | |
1043 | } | |
1044 | ||
1045 | /** | |
1046 | * gfs2_readlinki - return the contents of a symlink | |
1047 | * @ip: the symlink's inode | |
1048 | * @buf: a pointer to the buffer to be filled | |
1049 | * @len: a pointer to the length of @buf | |
1050 | * | |
1051 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1052 | * to be freed by the caller. | |
1053 | * | |
1054 | * Returns: errno | |
1055 | */ | |
1056 | ||
1057 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1058 | { | |
1059 | struct gfs2_holder i_gh; | |
1060 | struct buffer_head *dibh; | |
1061 | unsigned int x; | |
1062 | int error; | |
1063 | ||
1064 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1065 | error = gfs2_glock_nq_atime(&i_gh); | |
1066 | if (error) { | |
1067 | gfs2_holder_uninit(&i_gh); | |
1068 | return error; | |
1069 | } | |
1070 | ||
1071 | if (!ip->i_di.di_size) { | |
1072 | gfs2_consist_inode(ip); | |
1073 | error = -EIO; | |
1074 | goto out; | |
1075 | } | |
1076 | ||
1077 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1078 | if (error) | |
1079 | goto out; | |
1080 | ||
1081 | x = ip->i_di.di_size + 1; | |
1082 | if (x > *len) { | |
1083 | *buf = kmalloc(x, GFP_KERNEL); | |
1084 | if (!*buf) { | |
1085 | error = -ENOMEM; | |
1086 | goto out_brelse; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1091 | *len = x; | |
1092 | ||
feaa7bba | 1093 | out_brelse: |
b3b94faa | 1094 | brelse(dibh); |
feaa7bba | 1095 | out: |
b3b94faa | 1096 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1097 | return error; |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1102 | * conditionally update the inode's atime | |
1103 | * @gh: the holder to acquire | |
1104 | * | |
1105 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1106 | * Update if the difference between the current time and the inode's current | |
1107 | * atime is greater than an interval specified at mount. | |
1108 | * | |
1109 | * Returns: errno | |
1110 | */ | |
1111 | ||
1112 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1113 | { | |
1114 | struct gfs2_glock *gl = gh->gh_gl; | |
1115 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1116 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1117 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1118 | unsigned int state; |
1119 | int flags; | |
1120 | int error; | |
1121 | ||
1122 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1123 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1124 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1125 | return -EINVAL; | |
1126 | ||
1127 | state = gh->gh_state; | |
1128 | flags = gh->gh_flags; | |
1129 | ||
1130 | error = gfs2_glock_nq(gh); | |
1131 | if (error) | |
1132 | return error; | |
1133 | ||
1134 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1135 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1136 | return 0; | |
1137 | ||
1138 | curtime = get_seconds(); | |
1a7b1eed | 1139 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1140 | gfs2_glock_dq(gh); |
fd88de56 SW |
1141 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1142 | gh); | |
b3b94faa DT |
1143 | error = gfs2_glock_nq(gh); |
1144 | if (error) | |
1145 | return error; | |
1146 | ||
1147 | /* Verify that atime hasn't been updated while we were | |
1148 | trying to get exclusive lock. */ | |
1149 | ||
1150 | curtime = get_seconds(); | |
1a7b1eed | 1151 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1152 | struct buffer_head *dibh; |
48516ced | 1153 | struct gfs2_dinode *di; |
b3b94faa DT |
1154 | |
1155 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1156 | if (error == -EROFS) | |
1157 | return 0; | |
1158 | if (error) | |
1159 | goto fail; | |
1160 | ||
1161 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1162 | if (error) | |
1163 | goto fail_end_trans; | |
1164 | ||
1a7b1eed | 1165 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1166 | |
d4e9c4c3 | 1167 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1168 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1169 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1170 | brelse(dibh); |
1171 | ||
1172 | gfs2_trans_end(sdp); | |
1173 | } | |
1174 | ||
1175 | /* If someone else has asked for the glock, | |
1176 | unlock and let them have it. Then reacquire | |
1177 | in the original state. */ | |
1178 | if (gfs2_glock_is_blocking(gl)) { | |
1179 | gfs2_glock_dq(gh); | |
1180 | gfs2_holder_reinit(state, flags, gh); | |
1181 | return gfs2_glock_nq(gh); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | return 0; | |
1186 | ||
feaa7bba | 1187 | fail_end_trans: |
b3b94faa | 1188 | gfs2_trans_end(sdp); |
feaa7bba | 1189 | fail: |
b3b94faa | 1190 | gfs2_glock_dq(gh); |
b3b94faa DT |
1191 | return error; |
1192 | } | |
1193 | ||
b3b94faa DT |
1194 | static int |
1195 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1196 | { | |
1197 | struct buffer_head *dibh; | |
1198 | int error; | |
1199 | ||
1200 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1201 | if (!error) { | |
feaa7bba SW |
1202 | error = inode_setattr(&ip->i_inode, attr); |
1203 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1204 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1205 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1206 | brelse(dibh); |
1207 | } | |
1208 | return error; | |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * gfs2_setattr_simple - | |
1213 | * @ip: | |
1214 | * @attr: | |
1215 | * | |
1216 | * Called with a reference on the vnode. | |
1217 | * | |
1218 | * Returns: errno | |
1219 | */ | |
1220 | ||
1221 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1222 | { | |
1223 | int error; | |
1224 | ||
5c676f6d | 1225 | if (current->journal_info) |
b3b94faa DT |
1226 | return __gfs2_setattr_simple(ip, attr); |
1227 | ||
feaa7bba | 1228 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1229 | if (error) |
1230 | return error; | |
1231 | ||
1232 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1233 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1234 | return error; |
1235 | } | |
1236 |