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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 | |
bb8d8a6f SW |
41 | struct gfs2_inum_range_host { |
42 | u64 ir_start; | |
43 | u64 ir_length; | |
44 | }; | |
45 | ||
feaa7bba SW |
46 | static int iget_test(struct inode *inode, void *opaque) |
47 | { | |
48 | struct gfs2_inode *ip = GFS2_I(inode); | |
dbb7cae2 | 49 | u64 *no_addr = opaque; |
feaa7bba | 50 | |
dbb7cae2 | 51 | if (ip->i_no_addr == *no_addr && |
1be38679 | 52 | inode->i_private != NULL) |
feaa7bba | 53 | return 1; |
b3b94faa | 54 | |
feaa7bba SW |
55 | return 0; |
56 | } | |
57 | ||
58 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 59 | { |
feaa7bba | 60 | struct gfs2_inode *ip = GFS2_I(inode); |
dbb7cae2 | 61 | u64 *no_addr = opaque; |
b3b94faa | 62 | |
dbb7cae2 SW |
63 | inode->i_ino = (unsigned long)*no_addr; |
64 | ip->i_no_addr = *no_addr; | |
feaa7bba SW |
65 | return 0; |
66 | } | |
b3b94faa | 67 | |
dbb7cae2 | 68 | struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr) |
feaa7bba | 69 | { |
dbb7cae2 SW |
70 | unsigned long hash = (unsigned long)no_addr; |
71 | return ilookup5(sb, hash, iget_test, &no_addr); | |
feaa7bba | 72 | } |
b3b94faa | 73 | |
dbb7cae2 | 74 | static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) |
feaa7bba | 75 | { |
dbb7cae2 SW |
76 | unsigned long hash = (unsigned long)no_addr; |
77 | return iget5_locked(sb, hash, iget_test, iget_set, &no_addr); | |
b3b94faa DT |
78 | } |
79 | ||
80 | /** | |
feaa7bba SW |
81 | * gfs2_inode_lookup - Lookup an inode |
82 | * @sb: The super block | |
dbb7cae2 | 83 | * @no_addr: The inode number |
feaa7bba | 84 | * @type: The type of the inode |
b3b94faa | 85 | * |
feaa7bba | 86 | * Returns: A VFS inode, or an error |
b3b94faa DT |
87 | */ |
88 | ||
dbb7cae2 | 89 | struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned int type) |
b3b94faa | 90 | { |
dbb7cae2 | 91 | struct inode *inode = gfs2_iget(sb, no_addr); |
feaa7bba SW |
92 | struct gfs2_inode *ip = GFS2_I(inode); |
93 | struct gfs2_glock *io_gl; | |
94 | int error; | |
b3b94faa | 95 | |
26d83ded SW |
96 | if (!inode) |
97 | return ERR_PTR(-ENOBUFS); | |
98 | ||
feaa7bba SW |
99 | if (inode->i_state & I_NEW) { |
100 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
101 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 102 | inode->i_private = ip; |
feaa7bba SW |
103 | inode->i_mode = mode; |
104 | ||
105 | if (S_ISREG(mode)) { | |
106 | inode->i_op = &gfs2_file_iops; | |
107 | inode->i_fop = &gfs2_file_fops; | |
108 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
109 | } else if (S_ISDIR(mode)) { | |
110 | inode->i_op = &gfs2_dir_iops; | |
111 | inode->i_fop = &gfs2_dir_fops; | |
112 | } else if (S_ISLNK(mode)) { | |
113 | inode->i_op = &gfs2_symlink_iops; | |
114 | } else { | |
115 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 116 | } |
b3b94faa | 117 | |
dbb7cae2 | 118 | error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
feaa7bba SW |
119 | if (unlikely(error)) |
120 | goto fail; | |
121 | ip->i_gl->gl_object = ip; | |
b3b94faa | 122 | |
dbb7cae2 | 123 | error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
feaa7bba SW |
124 | if (unlikely(error)) |
125 | goto fail_put; | |
b3b94faa | 126 | |
bfded27b | 127 | set_bit(GIF_INVALID, &ip->i_flags); |
feaa7bba SW |
128 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
129 | if (unlikely(error)) | |
130 | goto fail_iopen; | |
b3b94faa | 131 | |
feaa7bba SW |
132 | gfs2_glock_put(io_gl); |
133 | unlock_new_inode(inode); | |
134 | } | |
b3b94faa DT |
135 | |
136 | return inode; | |
feaa7bba SW |
137 | fail_iopen: |
138 | gfs2_glock_put(io_gl); | |
139 | fail_put: | |
140 | ip->i_gl->gl_object = NULL; | |
141 | gfs2_glock_put(ip->i_gl); | |
142 | fail: | |
143 | iput(inode); | |
144 | return ERR_PTR(error); | |
b3b94faa DT |
145 | } |
146 | ||
af339c02 | 147 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
148 | { |
149 | struct gfs2_dinode_host *di = &ip->i_di; | |
150 | const struct gfs2_dinode *str = buf; | |
151 | ||
dbb7cae2 | 152 | if (ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)) { |
af339c02 SW |
153 | if (gfs2_consist_inode(ip)) |
154 | gfs2_dinode_print(ip); | |
155 | return -EIO; | |
156 | } | |
dbb7cae2 | 157 | ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); |
b60623c2 | 158 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
e7f14f4d | 159 | ip->i_inode.i_rdev = 0; |
b60623c2 | 160 | switch (ip->i_inode.i_mode & S_IFMT) { |
e7f14f4d SW |
161 | case S_IFBLK: |
162 | case S_IFCHR: | |
163 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
164 | be32_to_cpu(str->di_minor)); | |
165 | break; | |
166 | }; | |
167 | ||
2933f925 SW |
168 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
169 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); | |
4f56110a SW |
170 | /* |
171 | * We will need to review setting the nlink count here in the | |
172 | * light of the forthcoming ro bind mount work. This is a reminder | |
173 | * to do that. | |
174 | */ | |
175 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); | |
ea744d01 | 176 | di->di_size = be64_to_cpu(str->di_size); |
9e2dbdac | 177 | i_size_write(&ip->i_inode, di->di_size); |
ea744d01 | 178 | di->di_blocks = be64_to_cpu(str->di_blocks); |
9e2dbdac | 179 | gfs2_set_inode_blocks(&ip->i_inode); |
1a7b1eed SW |
180 | ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); |
181 | ip->i_inode.i_atime.tv_nsec = 0; | |
182 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); | |
183 | ip->i_inode.i_mtime.tv_nsec = 0; | |
184 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); | |
185 | ip->i_inode.i_ctime.tv_nsec = 0; | |
ea744d01 SW |
186 | |
187 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
188 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
189 | di->di_generation = be64_to_cpu(str->di_generation); | |
190 | ||
191 | di->di_flags = be32_to_cpu(str->di_flags); | |
6b124d8d | 192 | gfs2_set_inode_flags(&ip->i_inode); |
ea744d01 SW |
193 | di->di_height = be16_to_cpu(str->di_height); |
194 | ||
195 | di->di_depth = be16_to_cpu(str->di_depth); | |
196 | di->di_entries = be32_to_cpu(str->di_entries); | |
197 | ||
198 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 199 | return 0; |
ea744d01 SW |
200 | } |
201 | ||
b3b94faa DT |
202 | /** |
203 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
204 | * @ip: The GFS2 inode | |
205 | * | |
206 | * Returns: errno | |
207 | */ | |
208 | ||
209 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
210 | { | |
211 | struct buffer_head *dibh; | |
212 | int error; | |
213 | ||
214 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
215 | if (error) | |
216 | return error; | |
217 | ||
feaa7bba | 218 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
219 | brelse(dibh); |
220 | return -EIO; | |
221 | } | |
222 | ||
af339c02 | 223 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 224 | brelse(dibh); |
bfded27b | 225 | clear_bit(GIF_INVALID, &ip->i_flags); |
b3b94faa | 226 | |
af339c02 | 227 | return error; |
b3b94faa DT |
228 | } |
229 | ||
feaa7bba | 230 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 231 | { |
feaa7bba | 232 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
233 | struct gfs2_alloc *al; |
234 | struct gfs2_rgrpd *rgd; | |
235 | int error; | |
236 | ||
237 | if (ip->i_di.di_blocks != 1) { | |
238 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 239 | gfs2_dinode_print(ip); |
b3b94faa DT |
240 | return -EIO; |
241 | } | |
242 | ||
243 | al = gfs2_alloc_get(ip); | |
244 | ||
245 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
246 | if (error) | |
247 | goto out; | |
248 | ||
249 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
250 | if (error) | |
251 | goto out_qs; | |
252 | ||
dbb7cae2 | 253 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
b3b94faa DT |
254 | if (!rgd) { |
255 | gfs2_consist_inode(ip); | |
256 | error = -EIO; | |
257 | goto out_rindex_relse; | |
258 | } | |
259 | ||
260 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
261 | &al->al_rgd_gh); | |
262 | if (error) | |
263 | goto out_rindex_relse; | |
264 | ||
420b9e5e | 265 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
266 | if (error) |
267 | goto out_rg_gunlock; | |
268 | ||
269 | gfs2_trans_add_gl(ip->i_gl); | |
270 | ||
271 | gfs2_free_di(rgd, ip); | |
272 | ||
b3b94faa DT |
273 | gfs2_trans_end(sdp); |
274 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
275 | ||
feaa7bba | 276 | out_rg_gunlock: |
b3b94faa | 277 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 278 | out_rindex_relse: |
b3b94faa | 279 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 280 | out_qs: |
b3b94faa | 281 | gfs2_quota_unhold(ip); |
36327521 | 282 | out: |
feaa7bba | 283 | gfs2_alloc_put(ip); |
b3b94faa DT |
284 | return error; |
285 | } | |
286 | ||
b3b94faa | 287 | /** |
87d21e07 | 288 | * gfs2_change_nlink - Change nlink count on inode |
b3b94faa DT |
289 | * @ip: The GFS2 inode |
290 | * @diff: The change in the nlink count required | |
291 | * | |
292 | * Returns: errno | |
293 | */ | |
87d21e07 | 294 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
b3b94faa DT |
295 | { |
296 | struct buffer_head *dibh; | |
cd915493 | 297 | u32 nlink; |
b3b94faa DT |
298 | int error; |
299 | ||
4f56110a SW |
300 | BUG_ON(diff != 1 && diff != -1); |
301 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
302 | |
303 | /* If we are reducing the nlink count, but the new value ends up being | |
304 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 305 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 306 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 307 | gfs2_dinode_print(ip); |
b3b94faa DT |
308 | return -EIO; |
309 | } | |
310 | ||
311 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
312 | if (error) | |
313 | return error; | |
314 | ||
4f56110a SW |
315 | if (diff > 0) |
316 | inc_nlink(&ip->i_inode); | |
317 | else | |
318 | drop_nlink(&ip->i_inode); | |
319 | ||
ddfe0627 | 320 | ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa | 321 | |
d4e9c4c3 | 322 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 323 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 324 | brelse(dibh); |
feaa7bba | 325 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 326 | |
87d21e07 | 327 | if (ip->i_inode.i_nlink == 0) |
ddee7608 | 328 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
87d21e07 | 329 | |
5509826f WC |
330 | return error; |
331 | } | |
332 | ||
c752666c SW |
333 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
334 | { | |
335 | struct qstr qstr; | |
6c93fd1e | 336 | struct inode *inode; |
71b86f56 | 337 | gfs2_str2qstr(&qstr, name); |
6c93fd1e RC |
338 | inode = gfs2_lookupi(dip, &qstr, 1, NULL); |
339 | /* gfs2_lookupi has inconsistent callers: vfs | |
340 | * related routines expect NULL for no entry found, | |
341 | * gfs2_lookup_simple callers expect ENOENT | |
342 | * and do not check for NULL. | |
343 | */ | |
344 | if (inode == NULL) | |
345 | return ERR_PTR(-ENOENT); | |
346 | else | |
347 | return inode; | |
c752666c SW |
348 | } |
349 | ||
350 | ||
b3b94faa DT |
351 | /** |
352 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
353 | * @d_gh: An initialized holder for the directory glock | |
354 | * @name: The name of the inode to look for | |
355 | * @is_root: If 1, ignore the caller's permissions | |
356 | * @i_gh: An uninitialized holder for the new inode glock | |
357 | * | |
d7c103d0 SW |
358 | * This can be called via the VFS filldir function when NFS is doing |
359 | * a readdirplus and the inode which its intending to stat isn't | |
360 | * already in cache. In this case we must not take the directory glock | |
361 | * again, since the readdir call will have already taken that lock. | |
b3b94faa DT |
362 | * |
363 | * Returns: errno | |
364 | */ | |
365 | ||
feaa7bba SW |
366 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
367 | int is_root, struct nameidata *nd) | |
b3b94faa | 368 | { |
c9fd4307 | 369 | struct super_block *sb = dir->i_sb; |
feaa7bba | 370 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 371 | struct gfs2_holder d_gh; |
d7c103d0 | 372 | int error; |
c752666c | 373 | struct inode *inode = NULL; |
d7c103d0 | 374 | int unlock = 0; |
b3b94faa DT |
375 | |
376 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 377 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 378 | |
c752666c SW |
379 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
380 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
381 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
382 | igrab(dir); |
383 | return dir; | |
b3b94faa DT |
384 | } |
385 | ||
d7c103d0 SW |
386 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) { |
387 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
388 | if (error) | |
389 | return ERR_PTR(error); | |
390 | unlock = 1; | |
391 | } | |
b3b94faa DT |
392 | |
393 | if (!is_root) { | |
faf450ef | 394 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
395 | if (error) |
396 | goto out; | |
397 | } | |
398 | ||
dbb7cae2 SW |
399 | inode = gfs2_dir_search(dir, name); |
400 | if (IS_ERR(inode)) | |
401 | error = PTR_ERR(inode); | |
7359a19c | 402 | out: |
d7c103d0 SW |
403 | if (unlock) |
404 | gfs2_glock_dq_uninit(&d_gh); | |
c752666c SW |
405 | if (error == -ENOENT) |
406 | return NULL; | |
d7c103d0 | 407 | return inode ? inode : ERR_PTR(error); |
b3b94faa DT |
408 | } |
409 | ||
bb8d8a6f SW |
410 | static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf) |
411 | { | |
412 | const struct gfs2_inum_range *str = buf; | |
413 | ||
414 | ir->ir_start = be64_to_cpu(str->ir_start); | |
415 | ir->ir_length = be64_to_cpu(str->ir_length); | |
416 | } | |
417 | ||
418 | static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf) | |
419 | { | |
420 | struct gfs2_inum_range *str = buf; | |
421 | ||
422 | str->ir_start = cpu_to_be64(ir->ir_start); | |
423 | str->ir_length = cpu_to_be64(ir->ir_length); | |
424 | } | |
425 | ||
cd915493 | 426 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 427 | { |
feaa7bba | 428 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 429 | struct buffer_head *bh; |
e6972647 | 430 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
431 | int error; |
432 | ||
433 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
434 | if (error) | |
435 | return error; | |
f55ab26a | 436 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
437 | |
438 | error = gfs2_meta_inode_buffer(ip, &bh); | |
439 | if (error) { | |
f55ab26a | 440 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
441 | gfs2_trans_end(sdp); |
442 | return error; | |
443 | } | |
444 | ||
445 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
446 | ||
447 | if (ir.ir_length) { | |
448 | *formal_ino = ir.ir_start++; | |
449 | ir.ir_length--; | |
d4e9c4c3 | 450 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
451 | gfs2_inum_range_out(&ir, |
452 | bh->b_data + sizeof(struct gfs2_dinode)); | |
453 | brelse(bh); | |
f55ab26a | 454 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
455 | gfs2_trans_end(sdp); |
456 | return 0; | |
457 | } | |
458 | ||
459 | brelse(bh); | |
460 | ||
f55ab26a | 461 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
462 | gfs2_trans_end(sdp); |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
cd915493 | 467 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 468 | { |
feaa7bba SW |
469 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
470 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
471 | struct gfs2_holder gh; |
472 | struct buffer_head *bh; | |
e6972647 | 473 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
474 | int error; |
475 | ||
476 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
477 | if (error) | |
478 | return error; | |
479 | ||
480 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
481 | if (error) | |
482 | goto out; | |
f55ab26a | 483 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
484 | |
485 | error = gfs2_meta_inode_buffer(ip, &bh); | |
486 | if (error) | |
487 | goto out_end_trans; | |
907b9bce | 488 | |
b3b94faa DT |
489 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
490 | ||
491 | if (!ir.ir_length) { | |
492 | struct buffer_head *m_bh; | |
cd915493 | 493 | u64 x, y; |
b44b84d7 | 494 | __be64 z; |
b3b94faa DT |
495 | |
496 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
497 | if (error) | |
498 | goto out_brelse; | |
499 | ||
b44b84d7 AV |
500 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
501 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
502 | ir.ir_start = x; |
503 | ir.ir_length = GFS2_INUM_QUANTUM; | |
504 | x += GFS2_INUM_QUANTUM; | |
505 | if (x < y) | |
506 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 507 | z = cpu_to_be64(x); |
d4e9c4c3 | 508 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 509 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
510 | |
511 | brelse(m_bh); | |
512 | } | |
513 | ||
514 | *formal_ino = ir.ir_start++; | |
515 | ir.ir_length--; | |
516 | ||
d4e9c4c3 | 517 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
518 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
519 | ||
420b9e5e | 520 | out_brelse: |
b3b94faa | 521 | brelse(bh); |
420b9e5e | 522 | out_end_trans: |
f55ab26a | 523 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 524 | gfs2_trans_end(sdp); |
420b9e5e | 525 | out: |
b3b94faa | 526 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
527 | return error; |
528 | } | |
529 | ||
cd915493 | 530 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
531 | { |
532 | int error; | |
533 | ||
534 | error = pick_formal_ino_1(sdp, inum); | |
535 | if (error <= 0) | |
536 | return error; | |
537 | ||
538 | error = pick_formal_ino_2(sdp, inum); | |
539 | ||
540 | return error; | |
541 | } | |
542 | ||
543 | /** | |
544 | * create_ok - OK to create a new on-disk inode here? | |
545 | * @dip: Directory in which dinode is to be created | |
546 | * @name: Name of new dinode | |
547 | * @mode: | |
548 | * | |
549 | * Returns: errno | |
550 | */ | |
551 | ||
feaa7bba | 552 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
553 | unsigned int mode) |
554 | { | |
555 | int error; | |
556 | ||
faf450ef | 557 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
558 | if (error) |
559 | return error; | |
560 | ||
561 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 562 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
563 | return -EPERM; |
564 | ||
dbb7cae2 | 565 | error = gfs2_dir_check(&dip->i_inode, name, NULL); |
b3b94faa DT |
566 | switch (error) { |
567 | case -ENOENT: | |
568 | error = 0; | |
569 | break; | |
570 | case 0: | |
571 | return -EEXIST; | |
572 | default: | |
573 | return error; | |
574 | } | |
575 | ||
cd915493 | 576 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 577 | return -EFBIG; |
4f56110a | 578 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
579 | return -EMLINK; |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
585 | unsigned int *uid, unsigned int *gid) | |
586 | { | |
feaa7bba | 587 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 588 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
589 | if (S_ISDIR(*mode)) |
590 | *mode |= S_ISUID; | |
2933f925 | 591 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 592 | *mode &= ~07111; |
2933f925 | 593 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
594 | } else |
595 | *uid = current->fsuid; | |
596 | ||
b60623c2 | 597 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
598 | if (S_ISDIR(*mode)) |
599 | *mode |= S_ISGID; | |
2933f925 | 600 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
601 | } else |
602 | *gid = current->fsgid; | |
603 | } | |
604 | ||
dbb7cae2 | 605 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) |
b3b94faa | 606 | { |
feaa7bba | 607 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
608 | int error; |
609 | ||
610 | gfs2_alloc_get(dip); | |
611 | ||
612 | dip->i_alloc.al_requested = RES_DINODE; | |
613 | error = gfs2_inplace_reserve(dip); | |
614 | if (error) | |
615 | goto out; | |
616 | ||
feaa7bba | 617 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
618 | if (error) |
619 | goto out_ipreserv; | |
620 | ||
dbb7cae2 | 621 | *no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
622 | |
623 | gfs2_trans_end(sdp); | |
624 | ||
4340fe62 | 625 | out_ipreserv: |
b3b94faa | 626 | gfs2_inplace_release(dip); |
4340fe62 | 627 | out: |
b3b94faa | 628 | gfs2_alloc_put(dip); |
b3b94faa DT |
629 | return error; |
630 | } | |
631 | ||
632 | /** | |
633 | * init_dinode - Fill in a new dinode structure | |
634 | * @dip: the directory this inode is being created in | |
635 | * @gl: The glock covering the new inode | |
636 | * @inum: the inode number | |
637 | * @mode: the file permissions | |
638 | * @uid: | |
639 | * @gid: | |
640 | * | |
641 | */ | |
642 | ||
643 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 644 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 645 | unsigned int uid, unsigned int gid, |
e7f14f4d | 646 | const u64 *generation, dev_t dev) |
b3b94faa | 647 | { |
feaa7bba | 648 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 649 | struct gfs2_dinode *di; |
b3b94faa DT |
650 | struct buffer_head *dibh; |
651 | ||
652 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 653 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
654 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
655 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
656 | di = (struct gfs2_dinode *)dibh->b_data; |
657 | ||
2442a098 SW |
658 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
659 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
660 | di->di_mode = cpu_to_be32(mode); |
661 | di->di_uid = cpu_to_be32(uid); | |
662 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
663 | di->di_nlink = 0; |
664 | di->di_size = 0; | |
b96ca4fa SW |
665 | di->di_blocks = cpu_to_be64(1); |
666 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
667 | di->di_major = cpu_to_be32(MAJOR(dev)); |
668 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 669 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 670 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 671 | di->di_flags = 0; |
b3b94faa DT |
672 | |
673 | if (S_ISREG(mode)) { | |
674 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
675 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 676 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
677 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
678 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 679 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 680 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
681 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
682 | GFS2_DIF_INHERIT_DIRECTIO); | |
683 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
684 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
685 | } |
686 | ||
b96ca4fa | 687 | di->__pad1 = 0; |
a9583c79 | 688 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 689 | di->di_height = 0; |
b96ca4fa SW |
690 | di->__pad2 = 0; |
691 | di->__pad3 = 0; | |
294caaa3 SW |
692 | di->di_depth = 0; |
693 | di->di_entries = 0; | |
b96ca4fa | 694 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 695 | di->di_eattr = 0; |
b96ca4fa SW |
696 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
697 | ||
b3b94faa DT |
698 | brelse(dibh); |
699 | } | |
700 | ||
701 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 702 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 703 | const u64 *generation, dev_t dev) |
b3b94faa | 704 | { |
feaa7bba | 705 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
706 | unsigned int uid, gid; |
707 | int error; | |
708 | ||
709 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
710 | gfs2_alloc_get(dip); |
711 | ||
712 | error = gfs2_quota_lock(dip, uid, gid); | |
713 | if (error) | |
714 | goto out; | |
715 | ||
716 | error = gfs2_quota_check(dip, uid, gid); | |
717 | if (error) | |
718 | goto out_quota; | |
719 | ||
feaa7bba | 720 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
721 | if (error) |
722 | goto out_quota; | |
723 | ||
e7f14f4d | 724 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 725 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
726 | gfs2_trans_end(sdp); |
727 | ||
feaa7bba | 728 | out_quota: |
b3b94faa | 729 | gfs2_quota_unlock(dip); |
feaa7bba | 730 | out: |
b3b94faa | 731 | gfs2_alloc_put(dip); |
b3b94faa DT |
732 | return error; |
733 | } | |
734 | ||
feaa7bba SW |
735 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
736 | struct gfs2_inode *ip) | |
b3b94faa | 737 | { |
feaa7bba | 738 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
739 | struct gfs2_alloc *al; |
740 | int alloc_required; | |
741 | struct buffer_head *dibh; | |
742 | int error; | |
743 | ||
744 | al = gfs2_alloc_get(dip); | |
745 | ||
746 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
747 | if (error) | |
748 | goto fail; | |
749 | ||
feaa7bba | 750 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
751 | if (alloc_required < 0) |
752 | goto fail; | |
b3b94faa | 753 | if (alloc_required) { |
2933f925 | 754 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
755 | if (error) |
756 | goto fail_quota_locks; | |
757 | ||
758 | al->al_requested = sdp->sd_max_dirres; | |
759 | ||
760 | error = gfs2_inplace_reserve(dip); | |
761 | if (error) | |
762 | goto fail_quota_locks; | |
763 | ||
320dd101 | 764 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
bb8d8a6f | 765 | al->al_rgd->rd_length + |
907b9bce | 766 | 2 * RES_DINODE + |
b3b94faa DT |
767 | RES_STATFS + RES_QUOTA, 0); |
768 | if (error) | |
769 | goto fail_ipreserv; | |
770 | } else { | |
feaa7bba | 771 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
772 | if (error) |
773 | goto fail_quota_locks; | |
774 | } | |
775 | ||
dbb7cae2 | 776 | error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
777 | if (error) |
778 | goto fail_end_trans; | |
779 | ||
780 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
781 | if (error) | |
782 | goto fail_end_trans; | |
4f56110a | 783 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 784 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 785 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 786 | brelse(dibh); |
b3b94faa DT |
787 | return 0; |
788 | ||
320dd101 | 789 | fail_end_trans: |
b3b94faa DT |
790 | gfs2_trans_end(sdp); |
791 | ||
320dd101 | 792 | fail_ipreserv: |
b3b94faa DT |
793 | if (dip->i_alloc.al_rgd) |
794 | gfs2_inplace_release(dip); | |
795 | ||
320dd101 | 796 | fail_quota_locks: |
b3b94faa DT |
797 | gfs2_quota_unlock(dip); |
798 | ||
320dd101 | 799 | fail: |
b3b94faa | 800 | gfs2_alloc_put(dip); |
b3b94faa DT |
801 | return error; |
802 | } | |
803 | ||
fcb47e0b RH |
804 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
805 | { | |
806 | int err; | |
807 | size_t len; | |
808 | void *value; | |
809 | char *name; | |
810 | struct gfs2_ea_request er; | |
811 | ||
812 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
813 | &name, &value, &len); | |
814 | ||
815 | if (err) { | |
816 | if (err == -EOPNOTSUPP) | |
817 | return 0; | |
818 | return err; | |
819 | } | |
820 | ||
821 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
822 | ||
823 | er.er_type = GFS2_EATYPE_SECURITY; | |
824 | er.er_name = name; | |
825 | er.er_data = value; | |
826 | er.er_name_len = strlen(name); | |
827 | er.er_data_len = len; | |
828 | ||
829 | err = gfs2_ea_set_i(ip, &er); | |
830 | ||
831 | kfree(value); | |
832 | kfree(name); | |
833 | ||
834 | return err; | |
835 | } | |
836 | ||
b3b94faa DT |
837 | /** |
838 | * gfs2_createi - Create a new inode | |
839 | * @ghs: An array of two holders | |
840 | * @name: The name of the new file | |
841 | * @mode: the permissions on the new inode | |
842 | * | |
843 | * @ghs[0] is an initialized holder for the directory | |
844 | * @ghs[1] is the holder for the inode lock | |
845 | * | |
7359a19c | 846 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
847 | * file are held. A transaction has been started and an inplace reservation |
848 | * is held, as well. | |
849 | * | |
7359a19c | 850 | * Returns: An inode |
b3b94faa DT |
851 | */ |
852 | ||
feaa7bba | 853 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 854 | unsigned int mode, dev_t dev) |
b3b94faa | 855 | { |
7359a19c | 856 | struct inode *inode; |
5c676f6d | 857 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
858 | struct inode *dir = &dip->i_inode; |
859 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
dbb7cae2 | 860 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; |
b3b94faa | 861 | int error; |
4340fe62 | 862 | u64 generation; |
b3b94faa DT |
863 | |
864 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 865 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 866 | |
b3b94faa DT |
867 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
868 | error = gfs2_glock_nq(ghs); | |
869 | if (error) | |
870 | goto fail; | |
871 | ||
872 | error = create_ok(dip, name, mode); | |
873 | if (error) | |
874 | goto fail_gunlock; | |
875 | ||
feaa7bba | 876 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
877 | if (error) |
878 | goto fail_gunlock; | |
879 | ||
dbb7cae2 | 880 | error = alloc_dinode(dip, &inum.no_addr, &generation); |
b3b94faa DT |
881 | if (error) |
882 | goto fail_gunlock; | |
883 | ||
28626e20 SW |
884 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
885 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
886 | if (error) | |
887 | goto fail_gunlock; | |
b3b94faa | 888 | |
e7f14f4d | 889 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
890 | if (error) |
891 | goto fail_gunlock2; | |
892 | ||
dbb7cae2 | 893 | inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode)); |
feaa7bba | 894 | if (IS_ERR(inode)) |
b3b94faa DT |
895 | goto fail_gunlock2; |
896 | ||
feaa7bba | 897 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
898 | if (error) |
899 | goto fail_iput; | |
900 | ||
feaa7bba | 901 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
902 | if (error) |
903 | goto fail_iput; | |
904 | ||
fcb47e0b RH |
905 | error = gfs2_security_init(dip, GFS2_I(inode)); |
906 | if (error) | |
907 | goto fail_iput; | |
908 | ||
feaa7bba | 909 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
910 | if (error) |
911 | goto fail_iput; | |
912 | ||
7359a19c SW |
913 | if (!inode) |
914 | return ERR_PTR(-ENOMEM); | |
915 | return inode; | |
b3b94faa | 916 | |
320dd101 | 917 | fail_iput: |
feaa7bba | 918 | iput(inode); |
320dd101 | 919 | fail_gunlock2: |
b3b94faa | 920 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 921 | fail_gunlock: |
b3b94faa | 922 | gfs2_glock_dq(ghs); |
320dd101 | 923 | fail: |
7359a19c | 924 | return ERR_PTR(error); |
b3b94faa DT |
925 | } |
926 | ||
b3b94faa DT |
927 | /** |
928 | * gfs2_rmdiri - Remove a directory | |
929 | * @dip: The parent directory of the directory to be removed | |
930 | * @name: The name of the directory to be removed | |
931 | * @ip: The GFS2 inode of the directory to be removed | |
932 | * | |
933 | * Assumes Glocks on dip and ip are held | |
934 | * | |
935 | * Returns: errno | |
936 | */ | |
937 | ||
feaa7bba SW |
938 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
939 | struct gfs2_inode *ip) | |
b3b94faa | 940 | { |
b3b94faa DT |
941 | struct qstr dotname; |
942 | int error; | |
943 | ||
944 | if (ip->i_di.di_entries != 2) { | |
945 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 946 | gfs2_dinode_print(ip); |
b3b94faa DT |
947 | return -EIO; |
948 | } | |
949 | ||
950 | error = gfs2_dir_del(dip, name); | |
951 | if (error) | |
952 | return error; | |
953 | ||
954 | error = gfs2_change_nlink(dip, -1); | |
955 | if (error) | |
956 | return error; | |
957 | ||
71b86f56 | 958 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
959 | error = gfs2_dir_del(ip, &dotname); |
960 | if (error) | |
961 | return error; | |
962 | ||
feaa7bba | 963 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
964 | error = gfs2_dir_del(ip, &dotname); |
965 | if (error) | |
966 | return error; | |
967 | ||
4f56110a SW |
968 | /* It looks odd, but it really should be done twice */ |
969 | error = gfs2_change_nlink(ip, -1); | |
970 | if (error) | |
971 | return error; | |
972 | ||
973 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
974 | if (error) |
975 | return error; | |
976 | ||
b3b94faa DT |
977 | return error; |
978 | } | |
979 | ||
980 | /* | |
981 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
982 | * @dip: the directory | |
983 | * @name: the name of the file | |
984 | * @ip: the inode | |
985 | * | |
986 | * Assumes that the lock on (at least) @dip is held. | |
987 | * | |
988 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
989 | */ | |
990 | ||
feaa7bba | 991 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
dbb7cae2 | 992 | const struct gfs2_inode *ip) |
b3b94faa | 993 | { |
b3b94faa DT |
994 | int error; |
995 | ||
feaa7bba | 996 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
997 | return -EPERM; |
998 | ||
b60623c2 | 999 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1000 | dip->i_inode.i_uid != current->fsuid && |
1001 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1002 | return -EPERM; |
1003 | ||
feaa7bba | 1004 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1005 | return -EPERM; |
1006 | ||
faf450ef | 1007 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1008 | if (error) |
1009 | return error; | |
1010 | ||
dbb7cae2 | 1011 | error = gfs2_dir_check(&dip->i_inode, name, ip); |
b3b94faa DT |
1012 | if (error) |
1013 | return error; | |
1014 | ||
b3b94faa DT |
1015 | return 0; |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1020 | * @this: move this | |
1021 | * @to: to here | |
1022 | * | |
1023 | * Follow @to back to the root and make sure we don't encounter @this | |
1024 | * Assumes we already hold the rename lock. | |
1025 | * | |
1026 | * Returns: errno | |
1027 | */ | |
1028 | ||
1029 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1030 | { | |
feaa7bba | 1031 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1032 | struct super_block *sb = dir->i_sb; |
7359a19c | 1033 | struct inode *tmp; |
b3b94faa DT |
1034 | struct qstr dotdot; |
1035 | int error = 0; | |
1036 | ||
71b86f56 | 1037 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1038 | |
7359a19c | 1039 | igrab(dir); |
b3b94faa DT |
1040 | |
1041 | for (;;) { | |
feaa7bba | 1042 | if (dir == &this->i_inode) { |
b3b94faa DT |
1043 | error = -EINVAL; |
1044 | break; | |
1045 | } | |
c9fd4307 | 1046 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1047 | error = 0; |
1048 | break; | |
1049 | } | |
1050 | ||
c752666c SW |
1051 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1052 | if (IS_ERR(tmp)) { | |
1053 | error = PTR_ERR(tmp); | |
b3b94faa | 1054 | break; |
c752666c | 1055 | } |
b3b94faa | 1056 | |
7359a19c SW |
1057 | iput(dir); |
1058 | dir = tmp; | |
b3b94faa DT |
1059 | } |
1060 | ||
7359a19c | 1061 | iput(dir); |
b3b94faa DT |
1062 | |
1063 | return error; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * gfs2_readlinki - return the contents of a symlink | |
1068 | * @ip: the symlink's inode | |
1069 | * @buf: a pointer to the buffer to be filled | |
1070 | * @len: a pointer to the length of @buf | |
1071 | * | |
1072 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1073 | * to be freed by the caller. | |
1074 | * | |
1075 | * Returns: errno | |
1076 | */ | |
1077 | ||
1078 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1079 | { | |
1080 | struct gfs2_holder i_gh; | |
1081 | struct buffer_head *dibh; | |
1082 | unsigned int x; | |
1083 | int error; | |
1084 | ||
1085 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1086 | error = gfs2_glock_nq_atime(&i_gh); | |
1087 | if (error) { | |
1088 | gfs2_holder_uninit(&i_gh); | |
1089 | return error; | |
1090 | } | |
1091 | ||
1092 | if (!ip->i_di.di_size) { | |
1093 | gfs2_consist_inode(ip); | |
1094 | error = -EIO; | |
1095 | goto out; | |
1096 | } | |
1097 | ||
1098 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1099 | if (error) | |
1100 | goto out; | |
1101 | ||
1102 | x = ip->i_di.di_size + 1; | |
1103 | if (x > *len) { | |
1104 | *buf = kmalloc(x, GFP_KERNEL); | |
1105 | if (!*buf) { | |
1106 | error = -ENOMEM; | |
1107 | goto out_brelse; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1112 | *len = x; | |
1113 | ||
feaa7bba | 1114 | out_brelse: |
b3b94faa | 1115 | brelse(dibh); |
feaa7bba | 1116 | out: |
b3b94faa | 1117 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1118 | return error; |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1123 | * conditionally update the inode's atime | |
1124 | * @gh: the holder to acquire | |
1125 | * | |
1126 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1127 | * Update if the difference between the current time and the inode's current | |
1128 | * atime is greater than an interval specified at mount. | |
1129 | * | |
1130 | * Returns: errno | |
1131 | */ | |
1132 | ||
1133 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1134 | { | |
1135 | struct gfs2_glock *gl = gh->gh_gl; | |
1136 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1137 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1138 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1139 | unsigned int state; |
1140 | int flags; | |
1141 | int error; | |
1142 | ||
1143 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1144 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1145 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1146 | return -EINVAL; | |
1147 | ||
1148 | state = gh->gh_state; | |
1149 | flags = gh->gh_flags; | |
1150 | ||
1151 | error = gfs2_glock_nq(gh); | |
1152 | if (error) | |
1153 | return error; | |
1154 | ||
1155 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1156 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1157 | return 0; | |
1158 | ||
1159 | curtime = get_seconds(); | |
1a7b1eed | 1160 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1161 | gfs2_glock_dq(gh); |
fd88de56 SW |
1162 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1163 | gh); | |
b3b94faa DT |
1164 | error = gfs2_glock_nq(gh); |
1165 | if (error) | |
1166 | return error; | |
1167 | ||
1168 | /* Verify that atime hasn't been updated while we were | |
1169 | trying to get exclusive lock. */ | |
1170 | ||
1171 | curtime = get_seconds(); | |
1a7b1eed | 1172 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1173 | struct buffer_head *dibh; |
48516ced | 1174 | struct gfs2_dinode *di; |
b3b94faa DT |
1175 | |
1176 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1177 | if (error == -EROFS) | |
1178 | return 0; | |
1179 | if (error) | |
1180 | goto fail; | |
1181 | ||
1182 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1183 | if (error) | |
1184 | goto fail_end_trans; | |
1185 | ||
1a7b1eed | 1186 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1187 | |
d4e9c4c3 | 1188 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1189 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1190 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1191 | brelse(dibh); |
1192 | ||
1193 | gfs2_trans_end(sdp); | |
1194 | } | |
1195 | ||
1196 | /* If someone else has asked for the glock, | |
1197 | unlock and let them have it. Then reacquire | |
1198 | in the original state. */ | |
1199 | if (gfs2_glock_is_blocking(gl)) { | |
1200 | gfs2_glock_dq(gh); | |
1201 | gfs2_holder_reinit(state, flags, gh); | |
1202 | return gfs2_glock_nq(gh); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | return 0; | |
1207 | ||
feaa7bba | 1208 | fail_end_trans: |
b3b94faa | 1209 | gfs2_trans_end(sdp); |
feaa7bba | 1210 | fail: |
b3b94faa | 1211 | gfs2_glock_dq(gh); |
b3b94faa DT |
1212 | return error; |
1213 | } | |
1214 | ||
b3b94faa DT |
1215 | static int |
1216 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1217 | { | |
1218 | struct buffer_head *dibh; | |
1219 | int error; | |
1220 | ||
1221 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1222 | if (!error) { | |
feaa7bba SW |
1223 | error = inode_setattr(&ip->i_inode, attr); |
1224 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1225 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1226 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1227 | brelse(dibh); |
1228 | } | |
1229 | return error; | |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * gfs2_setattr_simple - | |
1234 | * @ip: | |
1235 | * @attr: | |
1236 | * | |
1237 | * Called with a reference on the vnode. | |
1238 | * | |
1239 | * Returns: errno | |
1240 | */ | |
1241 | ||
1242 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1243 | { | |
1244 | int error; | |
1245 | ||
5c676f6d | 1246 | if (current->journal_info) |
b3b94faa DT |
1247 | return __gfs2_setattr_simple(ip, attr); |
1248 | ||
feaa7bba | 1249 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1250 | if (error) |
1251 | return error; | |
1252 | ||
1253 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1254 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1255 | return error; |
1256 | } | |
1257 | ||
bb8d8a6f SW |
1258 | void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) |
1259 | { | |
1260 | const struct gfs2_dinode_host *di = &ip->i_di; | |
1261 | struct gfs2_dinode *str = buf; | |
1262 | ||
1263 | str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); | |
1264 | str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); | |
1265 | str->di_header.__pad0 = 0; | |
1266 | str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); | |
1267 | str->di_header.__pad1 = 0; | |
1268 | str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); | |
1269 | str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); | |
1270 | str->di_mode = cpu_to_be32(ip->i_inode.i_mode); | |
1271 | str->di_uid = cpu_to_be32(ip->i_inode.i_uid); | |
1272 | str->di_gid = cpu_to_be32(ip->i_inode.i_gid); | |
1273 | str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); | |
1274 | str->di_size = cpu_to_be64(di->di_size); | |
1275 | str->di_blocks = cpu_to_be64(di->di_blocks); | |
1276 | str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); | |
1277 | str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); | |
1278 | str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); | |
1279 | ||
1280 | str->di_goal_meta = cpu_to_be64(di->di_goal_meta); | |
1281 | str->di_goal_data = cpu_to_be64(di->di_goal_data); | |
1282 | str->di_generation = cpu_to_be64(di->di_generation); | |
1283 | ||
1284 | str->di_flags = cpu_to_be32(di->di_flags); | |
1285 | str->di_height = cpu_to_be16(di->di_height); | |
1286 | str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && | |
1287 | !(ip->i_di.di_flags & GFS2_DIF_EXHASH) ? | |
1288 | GFS2_FORMAT_DE : 0); | |
1289 | str->di_depth = cpu_to_be16(di->di_depth); | |
1290 | str->di_entries = cpu_to_be32(di->di_entries); | |
1291 | ||
1292 | str->di_eattr = cpu_to_be64(di->di_eattr); | |
1293 | } | |
1294 | ||
1295 | void gfs2_dinode_print(const struct gfs2_inode *ip) | |
1296 | { | |
1297 | const struct gfs2_dinode_host *di = &ip->i_di; | |
1298 | ||
1299 | printk(KERN_INFO " no_formal_ino = %llu\n", | |
1300 | (unsigned long long)ip->i_no_formal_ino); | |
1301 | printk(KERN_INFO " no_addr = %llu\n", | |
1302 | (unsigned long long)ip->i_no_addr); | |
1303 | printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size); | |
1304 | printk(KERN_INFO " di_blocks = %llu\n", | |
1305 | (unsigned long long)di->di_blocks); | |
1306 | printk(KERN_INFO " di_goal_meta = %llu\n", | |
1307 | (unsigned long long)di->di_goal_meta); | |
1308 | printk(KERN_INFO " di_goal_data = %llu\n", | |
1309 | (unsigned long long)di->di_goal_data); | |
1310 | printk(KERN_INFO " di_flags = 0x%.8X\n", di->di_flags); | |
1311 | printk(KERN_INFO " di_height = %u\n", di->di_height); | |
1312 | printk(KERN_INFO " di_depth = %u\n", di->di_depth); | |
1313 | printk(KERN_INFO " di_entries = %u\n", di->di_entries); | |
1314 | printk(KERN_INFO " di_eattr = %llu\n", | |
1315 | (unsigned long long)di->di_eattr); | |
1316 | } | |
1317 |