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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 | ||
03dc6a53 AB |
283 | static int gfs2_change_nlink_i(struct gfs2_inode *ip) |
284 | { | |
285 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; | |
286 | struct gfs2_inode *rindex = GFS2_I(sdp->sd_rindex); | |
287 | struct gfs2_glock *ri_gl = rindex->i_gl; | |
288 | struct gfs2_rgrpd *rgd; | |
289 | struct gfs2_holder ri_gh, rg_gh; | |
290 | int existing, error; | |
291 | ||
292 | /* if we come from rename path, we could have the lock already */ | |
293 | existing = gfs2_glock_is_locked_by_me(ri_gl); | |
294 | if (!existing) { | |
295 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
296 | if (error) | |
297 | goto out; | |
298 | } | |
299 | ||
300 | /* find the matching rgd */ | |
301 | error = -EIO; | |
302 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
303 | if (!rgd) | |
304 | goto out_norgrp; | |
305 | ||
306 | /* | |
307 | * Eventually we may want to move rgd(s) to a linked list | |
308 | * and piggyback the free logic into one of gfs2 daemons | |
309 | * to gain some performance. | |
310 | */ | |
311 | if (!rgd->rd_gl || !gfs2_glock_is_locked_by_me(rgd->rd_gl)) { | |
312 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
313 | if (error) | |
314 | goto out_norgrp; | |
315 | ||
316 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ | |
317 | gfs2_glock_dq_uninit(&rg_gh); | |
318 | } | |
319 | ||
320 | out_norgrp: | |
321 | if (!existing) | |
322 | gfs2_glock_dq_uninit(&ri_gh); | |
323 | out: | |
324 | return error; | |
325 | } | |
326 | ||
b3b94faa | 327 | /** |
87d21e07 | 328 | * gfs2_change_nlink - Change nlink count on inode |
b3b94faa DT |
329 | * @ip: The GFS2 inode |
330 | * @diff: The change in the nlink count required | |
331 | * | |
332 | * Returns: errno | |
333 | */ | |
87d21e07 | 334 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
b3b94faa DT |
335 | { |
336 | struct buffer_head *dibh; | |
cd915493 | 337 | u32 nlink; |
b3b94faa DT |
338 | int error; |
339 | ||
4f56110a SW |
340 | BUG_ON(diff != 1 && diff != -1); |
341 | nlink = ip->i_inode.i_nlink + diff; | |
b3b94faa DT |
342 | |
343 | /* If we are reducing the nlink count, but the new value ends up being | |
344 | bigger than the old one, we must have underflowed. */ | |
4f56110a | 345 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
b3b94faa | 346 | if (gfs2_consist_inode(ip)) |
4cc14f0b | 347 | gfs2_dinode_print(ip); |
b3b94faa DT |
348 | return -EIO; |
349 | } | |
350 | ||
351 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
352 | if (error) | |
353 | return error; | |
354 | ||
4f56110a SW |
355 | if (diff > 0) |
356 | inc_nlink(&ip->i_inode); | |
357 | else | |
358 | drop_nlink(&ip->i_inode); | |
359 | ||
ddfe0627 | 360 | ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa | 361 | |
d4e9c4c3 | 362 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 363 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 364 | brelse(dibh); |
feaa7bba | 365 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 366 | |
87d21e07 WC |
367 | if (ip->i_inode.i_nlink == 0) |
368 | error = gfs2_change_nlink_i(ip); | |
369 | ||
5509826f WC |
370 | return error; |
371 | } | |
372 | ||
c752666c SW |
373 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
374 | { | |
375 | struct qstr qstr; | |
6c93fd1e | 376 | struct inode *inode; |
71b86f56 | 377 | gfs2_str2qstr(&qstr, name); |
6c93fd1e RC |
378 | inode = gfs2_lookupi(dip, &qstr, 1, NULL); |
379 | /* gfs2_lookupi has inconsistent callers: vfs | |
380 | * related routines expect NULL for no entry found, | |
381 | * gfs2_lookup_simple callers expect ENOENT | |
382 | * and do not check for NULL. | |
383 | */ | |
384 | if (inode == NULL) | |
385 | return ERR_PTR(-ENOENT); | |
386 | else | |
387 | return inode; | |
c752666c SW |
388 | } |
389 | ||
390 | ||
b3b94faa DT |
391 | /** |
392 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
393 | * @d_gh: An initialized holder for the directory glock | |
394 | * @name: The name of the inode to look for | |
395 | * @is_root: If 1, ignore the caller's permissions | |
396 | * @i_gh: An uninitialized holder for the new inode glock | |
397 | * | |
398 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
399 | * @is_root is true. | |
400 | * | |
401 | * Returns: errno | |
402 | */ | |
403 | ||
feaa7bba SW |
404 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
405 | int is_root, struct nameidata *nd) | |
b3b94faa | 406 | { |
c9fd4307 | 407 | struct super_block *sb = dir->i_sb; |
feaa7bba | 408 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 409 | struct gfs2_holder d_gh; |
629a21e7 | 410 | struct gfs2_inum_host inum; |
b3b94faa | 411 | unsigned int type; |
7359a19c | 412 | int error = 0; |
c752666c | 413 | struct inode *inode = NULL; |
b3b94faa DT |
414 | |
415 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 416 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 417 | |
c752666c SW |
418 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
419 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
420 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
421 | igrab(dir); |
422 | return dir; | |
b3b94faa DT |
423 | } |
424 | ||
425 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
426 | if (error) | |
c752666c | 427 | return ERR_PTR(error); |
b3b94faa DT |
428 | |
429 | if (!is_root) { | |
faf450ef | 430 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
431 | if (error) |
432 | goto out; | |
433 | } | |
434 | ||
c752666c | 435 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
436 | if (error) |
437 | goto out; | |
438 | ||
feaa7bba | 439 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 440 | |
7359a19c | 441 | out: |
b3b94faa | 442 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
443 | if (error == -ENOENT) |
444 | return NULL; | |
feaa7bba | 445 | return inode; |
b3b94faa DT |
446 | } |
447 | ||
cd915493 | 448 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 449 | { |
feaa7bba | 450 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 451 | struct buffer_head *bh; |
e6972647 | 452 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
453 | int error; |
454 | ||
455 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
456 | if (error) | |
457 | return error; | |
f55ab26a | 458 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
459 | |
460 | error = gfs2_meta_inode_buffer(ip, &bh); | |
461 | if (error) { | |
f55ab26a | 462 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
463 | gfs2_trans_end(sdp); |
464 | return error; | |
465 | } | |
466 | ||
467 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
468 | ||
469 | if (ir.ir_length) { | |
470 | *formal_ino = ir.ir_start++; | |
471 | ir.ir_length--; | |
d4e9c4c3 | 472 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
473 | gfs2_inum_range_out(&ir, |
474 | bh->b_data + sizeof(struct gfs2_dinode)); | |
475 | brelse(bh); | |
f55ab26a | 476 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
477 | gfs2_trans_end(sdp); |
478 | return 0; | |
479 | } | |
480 | ||
481 | brelse(bh); | |
482 | ||
f55ab26a | 483 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
484 | gfs2_trans_end(sdp); |
485 | ||
486 | return 1; | |
487 | } | |
488 | ||
cd915493 | 489 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 490 | { |
feaa7bba SW |
491 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
492 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
493 | struct gfs2_holder gh; |
494 | struct buffer_head *bh; | |
e6972647 | 495 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
496 | int error; |
497 | ||
498 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
499 | if (error) | |
500 | return error; | |
501 | ||
502 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
503 | if (error) | |
504 | goto out; | |
f55ab26a | 505 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
506 | |
507 | error = gfs2_meta_inode_buffer(ip, &bh); | |
508 | if (error) | |
509 | goto out_end_trans; | |
907b9bce | 510 | |
b3b94faa DT |
511 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
512 | ||
513 | if (!ir.ir_length) { | |
514 | struct buffer_head *m_bh; | |
cd915493 | 515 | u64 x, y; |
b44b84d7 | 516 | __be64 z; |
b3b94faa DT |
517 | |
518 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
519 | if (error) | |
520 | goto out_brelse; | |
521 | ||
b44b84d7 AV |
522 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
523 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
524 | ir.ir_start = x; |
525 | ir.ir_length = GFS2_INUM_QUANTUM; | |
526 | x += GFS2_INUM_QUANTUM; | |
527 | if (x < y) | |
528 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 529 | z = cpu_to_be64(x); |
d4e9c4c3 | 530 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 531 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
532 | |
533 | brelse(m_bh); | |
534 | } | |
535 | ||
536 | *formal_ino = ir.ir_start++; | |
537 | ir.ir_length--; | |
538 | ||
d4e9c4c3 | 539 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
540 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
541 | ||
420b9e5e | 542 | out_brelse: |
b3b94faa | 543 | brelse(bh); |
420b9e5e | 544 | out_end_trans: |
f55ab26a | 545 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 546 | gfs2_trans_end(sdp); |
420b9e5e | 547 | out: |
b3b94faa | 548 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
549 | return error; |
550 | } | |
551 | ||
cd915493 | 552 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
553 | { |
554 | int error; | |
555 | ||
556 | error = pick_formal_ino_1(sdp, inum); | |
557 | if (error <= 0) | |
558 | return error; | |
559 | ||
560 | error = pick_formal_ino_2(sdp, inum); | |
561 | ||
562 | return error; | |
563 | } | |
564 | ||
565 | /** | |
566 | * create_ok - OK to create a new on-disk inode here? | |
567 | * @dip: Directory in which dinode is to be created | |
568 | * @name: Name of new dinode | |
569 | * @mode: | |
570 | * | |
571 | * Returns: errno | |
572 | */ | |
573 | ||
feaa7bba | 574 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
575 | unsigned int mode) |
576 | { | |
577 | int error; | |
578 | ||
faf450ef | 579 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
580 | if (error) |
581 | return error; | |
582 | ||
583 | /* Don't create entries in an unlinked directory */ | |
4f56110a | 584 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
585 | return -EPERM; |
586 | ||
feaa7bba | 587 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
588 | switch (error) { |
589 | case -ENOENT: | |
590 | error = 0; | |
591 | break; | |
592 | case 0: | |
593 | return -EEXIST; | |
594 | default: | |
595 | return error; | |
596 | } | |
597 | ||
cd915493 | 598 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 599 | return -EFBIG; |
4f56110a | 600 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
601 | return -EMLINK; |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
607 | unsigned int *uid, unsigned int *gid) | |
608 | { | |
feaa7bba | 609 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
2933f925 | 610 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
b3b94faa DT |
611 | if (S_ISDIR(*mode)) |
612 | *mode |= S_ISUID; | |
2933f925 | 613 | else if (dip->i_inode.i_uid != current->fsuid) |
b3b94faa | 614 | *mode &= ~07111; |
2933f925 | 615 | *uid = dip->i_inode.i_uid; |
b3b94faa DT |
616 | } else |
617 | *uid = current->fsuid; | |
618 | ||
b60623c2 | 619 | if (dip->i_inode.i_mode & S_ISGID) { |
b3b94faa DT |
620 | if (S_ISDIR(*mode)) |
621 | *mode |= S_ISGID; | |
2933f925 | 622 | *gid = dip->i_inode.i_gid; |
b3b94faa DT |
623 | } else |
624 | *gid = current->fsgid; | |
625 | } | |
626 | ||
629a21e7 | 627 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 628 | u64 *generation) |
b3b94faa | 629 | { |
feaa7bba | 630 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
631 | int error; |
632 | ||
633 | gfs2_alloc_get(dip); | |
634 | ||
635 | dip->i_alloc.al_requested = RES_DINODE; | |
636 | error = gfs2_inplace_reserve(dip); | |
637 | if (error) | |
638 | goto out; | |
639 | ||
feaa7bba | 640 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
641 | if (error) |
642 | goto out_ipreserv; | |
643 | ||
4340fe62 | 644 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
645 | |
646 | gfs2_trans_end(sdp); | |
647 | ||
4340fe62 | 648 | out_ipreserv: |
b3b94faa | 649 | gfs2_inplace_release(dip); |
4340fe62 | 650 | out: |
b3b94faa | 651 | gfs2_alloc_put(dip); |
b3b94faa DT |
652 | return error; |
653 | } | |
654 | ||
655 | /** | |
656 | * init_dinode - Fill in a new dinode structure | |
657 | * @dip: the directory this inode is being created in | |
658 | * @gl: The glock covering the new inode | |
659 | * @inum: the inode number | |
660 | * @mode: the file permissions | |
661 | * @uid: | |
662 | * @gid: | |
663 | * | |
664 | */ | |
665 | ||
666 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 667 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 668 | unsigned int uid, unsigned int gid, |
e7f14f4d | 669 | const u64 *generation, dev_t dev) |
b3b94faa | 670 | { |
feaa7bba | 671 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 672 | struct gfs2_dinode *di; |
b3b94faa DT |
673 | struct buffer_head *dibh; |
674 | ||
675 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 676 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
677 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
678 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
679 | di = (struct gfs2_dinode *)dibh->b_data; |
680 | ||
2442a098 SW |
681 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
682 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
683 | di->di_mode = cpu_to_be32(mode); |
684 | di->di_uid = cpu_to_be32(uid); | |
685 | di->di_gid = cpu_to_be32(gid); | |
294caaa3 SW |
686 | di->di_nlink = 0; |
687 | di->di_size = 0; | |
b96ca4fa SW |
688 | di->di_blocks = cpu_to_be64(1); |
689 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
690 | di->di_major = cpu_to_be32(MAJOR(dev)); |
691 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 692 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 693 | di->di_generation = cpu_to_be64(*generation); |
294caaa3 | 694 | di->di_flags = 0; |
b3b94faa DT |
695 | |
696 | if (S_ISREG(mode)) { | |
697 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
698 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 699 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
700 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
701 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 702 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 703 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
704 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
705 | GFS2_DIF_INHERIT_DIRECTIO); | |
706 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
707 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
708 | } |
709 | ||
b96ca4fa | 710 | di->__pad1 = 0; |
a9583c79 | 711 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
294caaa3 | 712 | di->di_height = 0; |
b96ca4fa SW |
713 | di->__pad2 = 0; |
714 | di->__pad3 = 0; | |
294caaa3 SW |
715 | di->di_depth = 0; |
716 | di->di_entries = 0; | |
b96ca4fa | 717 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
294caaa3 | 718 | di->di_eattr = 0; |
b96ca4fa SW |
719 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
720 | ||
b3b94faa DT |
721 | brelse(dibh); |
722 | } | |
723 | ||
724 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 725 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 726 | const u64 *generation, dev_t dev) |
b3b94faa | 727 | { |
feaa7bba | 728 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
729 | unsigned int uid, gid; |
730 | int error; | |
731 | ||
732 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
733 | gfs2_alloc_get(dip); |
734 | ||
735 | error = gfs2_quota_lock(dip, uid, gid); | |
736 | if (error) | |
737 | goto out; | |
738 | ||
739 | error = gfs2_quota_check(dip, uid, gid); | |
740 | if (error) | |
741 | goto out_quota; | |
742 | ||
feaa7bba | 743 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
744 | if (error) |
745 | goto out_quota; | |
746 | ||
e7f14f4d | 747 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 748 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
749 | gfs2_trans_end(sdp); |
750 | ||
feaa7bba | 751 | out_quota: |
b3b94faa | 752 | gfs2_quota_unlock(dip); |
feaa7bba | 753 | out: |
b3b94faa | 754 | gfs2_alloc_put(dip); |
b3b94faa DT |
755 | return error; |
756 | } | |
757 | ||
feaa7bba SW |
758 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
759 | struct gfs2_inode *ip) | |
b3b94faa | 760 | { |
feaa7bba | 761 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
762 | struct gfs2_alloc *al; |
763 | int alloc_required; | |
764 | struct buffer_head *dibh; | |
765 | int error; | |
766 | ||
767 | al = gfs2_alloc_get(dip); | |
768 | ||
769 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
770 | if (error) | |
771 | goto fail; | |
772 | ||
feaa7bba | 773 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
774 | if (alloc_required < 0) |
775 | goto fail; | |
b3b94faa | 776 | if (alloc_required) { |
2933f925 | 777 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
b3b94faa DT |
778 | if (error) |
779 | goto fail_quota_locks; | |
780 | ||
781 | al->al_requested = sdp->sd_max_dirres; | |
782 | ||
783 | error = gfs2_inplace_reserve(dip); | |
784 | if (error) | |
785 | goto fail_quota_locks; | |
786 | ||
320dd101 | 787 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 788 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 789 | 2 * RES_DINODE + |
b3b94faa DT |
790 | RES_STATFS + RES_QUOTA, 0); |
791 | if (error) | |
792 | goto fail_ipreserv; | |
793 | } else { | |
feaa7bba | 794 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
795 | if (error) |
796 | goto fail_quota_locks; | |
797 | } | |
798 | ||
b60623c2 | 799 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); |
b3b94faa DT |
800 | if (error) |
801 | goto fail_end_trans; | |
802 | ||
803 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
804 | if (error) | |
805 | goto fail_end_trans; | |
4f56110a | 806 | ip->i_inode.i_nlink = 1; |
d4e9c4c3 | 807 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 808 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 809 | brelse(dibh); |
b3b94faa DT |
810 | return 0; |
811 | ||
320dd101 | 812 | fail_end_trans: |
b3b94faa DT |
813 | gfs2_trans_end(sdp); |
814 | ||
320dd101 | 815 | fail_ipreserv: |
b3b94faa DT |
816 | if (dip->i_alloc.al_rgd) |
817 | gfs2_inplace_release(dip); | |
818 | ||
320dd101 | 819 | fail_quota_locks: |
b3b94faa DT |
820 | gfs2_quota_unlock(dip); |
821 | ||
320dd101 | 822 | fail: |
b3b94faa | 823 | gfs2_alloc_put(dip); |
b3b94faa DT |
824 | return error; |
825 | } | |
826 | ||
fcb47e0b RH |
827 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
828 | { | |
829 | int err; | |
830 | size_t len; | |
831 | void *value; | |
832 | char *name; | |
833 | struct gfs2_ea_request er; | |
834 | ||
835 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
836 | &name, &value, &len); | |
837 | ||
838 | if (err) { | |
839 | if (err == -EOPNOTSUPP) | |
840 | return 0; | |
841 | return err; | |
842 | } | |
843 | ||
844 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
845 | ||
846 | er.er_type = GFS2_EATYPE_SECURITY; | |
847 | er.er_name = name; | |
848 | er.er_data = value; | |
849 | er.er_name_len = strlen(name); | |
850 | er.er_data_len = len; | |
851 | ||
852 | err = gfs2_ea_set_i(ip, &er); | |
853 | ||
854 | kfree(value); | |
855 | kfree(name); | |
856 | ||
857 | return err; | |
858 | } | |
859 | ||
b3b94faa DT |
860 | /** |
861 | * gfs2_createi - Create a new inode | |
862 | * @ghs: An array of two holders | |
863 | * @name: The name of the new file | |
864 | * @mode: the permissions on the new inode | |
865 | * | |
866 | * @ghs[0] is an initialized holder for the directory | |
867 | * @ghs[1] is the holder for the inode lock | |
868 | * | |
7359a19c | 869 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
870 | * file are held. A transaction has been started and an inplace reservation |
871 | * is held, as well. | |
872 | * | |
7359a19c | 873 | * Returns: An inode |
b3b94faa DT |
874 | */ |
875 | ||
feaa7bba | 876 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 877 | unsigned int mode, dev_t dev) |
b3b94faa | 878 | { |
7359a19c | 879 | struct inode *inode; |
5c676f6d | 880 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
881 | struct inode *dir = &dip->i_inode; |
882 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 883 | struct gfs2_inum_host inum; |
b3b94faa | 884 | int error; |
4340fe62 | 885 | u64 generation; |
b3b94faa DT |
886 | |
887 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 888 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 889 | |
b3b94faa DT |
890 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
891 | error = gfs2_glock_nq(ghs); | |
892 | if (error) | |
893 | goto fail; | |
894 | ||
895 | error = create_ok(dip, name, mode); | |
896 | if (error) | |
897 | goto fail_gunlock; | |
898 | ||
feaa7bba | 899 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
900 | if (error) |
901 | goto fail_gunlock; | |
902 | ||
4340fe62 | 903 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
904 | if (error) |
905 | goto fail_gunlock; | |
906 | ||
28626e20 SW |
907 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
908 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
909 | if (error) | |
910 | goto fail_gunlock; | |
b3b94faa | 911 | |
e7f14f4d | 912 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
913 | if (error) |
914 | goto fail_gunlock2; | |
915 | ||
feaa7bba SW |
916 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
917 | if (IS_ERR(inode)) | |
b3b94faa DT |
918 | goto fail_gunlock2; |
919 | ||
feaa7bba | 920 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
921 | if (error) |
922 | goto fail_iput; | |
923 | ||
feaa7bba | 924 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
925 | if (error) |
926 | goto fail_iput; | |
927 | ||
fcb47e0b RH |
928 | error = gfs2_security_init(dip, GFS2_I(inode)); |
929 | if (error) | |
930 | goto fail_iput; | |
931 | ||
feaa7bba | 932 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
933 | if (error) |
934 | goto fail_iput; | |
935 | ||
7359a19c SW |
936 | if (!inode) |
937 | return ERR_PTR(-ENOMEM); | |
938 | return inode; | |
b3b94faa | 939 | |
320dd101 | 940 | fail_iput: |
feaa7bba | 941 | iput(inode); |
320dd101 | 942 | fail_gunlock2: |
b3b94faa | 943 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 944 | fail_gunlock: |
b3b94faa | 945 | gfs2_glock_dq(ghs); |
320dd101 | 946 | fail: |
7359a19c | 947 | return ERR_PTR(error); |
b3b94faa DT |
948 | } |
949 | ||
b3b94faa DT |
950 | /** |
951 | * gfs2_rmdiri - Remove a directory | |
952 | * @dip: The parent directory of the directory to be removed | |
953 | * @name: The name of the directory to be removed | |
954 | * @ip: The GFS2 inode of the directory to be removed | |
955 | * | |
956 | * Assumes Glocks on dip and ip are held | |
957 | * | |
958 | * Returns: errno | |
959 | */ | |
960 | ||
feaa7bba SW |
961 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
962 | struct gfs2_inode *ip) | |
b3b94faa | 963 | { |
b3b94faa DT |
964 | struct qstr dotname; |
965 | int error; | |
966 | ||
967 | if (ip->i_di.di_entries != 2) { | |
968 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 969 | gfs2_dinode_print(ip); |
b3b94faa DT |
970 | return -EIO; |
971 | } | |
972 | ||
973 | error = gfs2_dir_del(dip, name); | |
974 | if (error) | |
975 | return error; | |
976 | ||
977 | error = gfs2_change_nlink(dip, -1); | |
978 | if (error) | |
979 | return error; | |
980 | ||
71b86f56 | 981 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
982 | error = gfs2_dir_del(ip, &dotname); |
983 | if (error) | |
984 | return error; | |
985 | ||
feaa7bba | 986 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
987 | error = gfs2_dir_del(ip, &dotname); |
988 | if (error) | |
989 | return error; | |
990 | ||
4f56110a SW |
991 | /* It looks odd, but it really should be done twice */ |
992 | error = gfs2_change_nlink(ip, -1); | |
993 | if (error) | |
994 | return error; | |
995 | ||
996 | error = gfs2_change_nlink(ip, -1); | |
b3b94faa DT |
997 | if (error) |
998 | return error; | |
999 | ||
b3b94faa DT |
1000 | return error; |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1005 | * @dip: the directory | |
1006 | * @name: the name of the file | |
1007 | * @ip: the inode | |
1008 | * | |
1009 | * Assumes that the lock on (at least) @dip is held. | |
1010 | * | |
1011 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1012 | */ | |
1013 | ||
feaa7bba | 1014 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1015 | struct gfs2_inode *ip) |
1016 | { | |
629a21e7 | 1017 | struct gfs2_inum_host inum; |
b3b94faa DT |
1018 | unsigned int type; |
1019 | int error; | |
1020 | ||
feaa7bba | 1021 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1022 | return -EPERM; |
1023 | ||
b60623c2 | 1024 | if ((dip->i_inode.i_mode & S_ISVTX) && |
2933f925 SW |
1025 | dip->i_inode.i_uid != current->fsuid && |
1026 | ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) | |
b3b94faa DT |
1027 | return -EPERM; |
1028 | ||
feaa7bba | 1029 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1030 | return -EPERM; |
1031 | ||
faf450ef | 1032 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1033 | if (error) |
1034 | return error; | |
1035 | ||
feaa7bba | 1036 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1037 | if (error) |
1038 | return error; | |
1039 | ||
1040 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1041 | return -ENOENT; | |
1042 | ||
b60623c2 | 1043 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
1044 | gfs2_consist_inode(dip); |
1045 | return -EIO; | |
1046 | } | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1053 | * @this: move this | |
1054 | * @to: to here | |
1055 | * | |
1056 | * Follow @to back to the root and make sure we don't encounter @this | |
1057 | * Assumes we already hold the rename lock. | |
1058 | * | |
1059 | * Returns: errno | |
1060 | */ | |
1061 | ||
1062 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1063 | { | |
feaa7bba | 1064 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1065 | struct super_block *sb = dir->i_sb; |
7359a19c | 1066 | struct inode *tmp; |
b3b94faa DT |
1067 | struct qstr dotdot; |
1068 | int error = 0; | |
1069 | ||
71b86f56 | 1070 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1071 | |
7359a19c | 1072 | igrab(dir); |
b3b94faa DT |
1073 | |
1074 | for (;;) { | |
feaa7bba | 1075 | if (dir == &this->i_inode) { |
b3b94faa DT |
1076 | error = -EINVAL; |
1077 | break; | |
1078 | } | |
c9fd4307 | 1079 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1080 | error = 0; |
1081 | break; | |
1082 | } | |
1083 | ||
c752666c SW |
1084 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1085 | if (IS_ERR(tmp)) { | |
1086 | error = PTR_ERR(tmp); | |
b3b94faa | 1087 | break; |
c752666c | 1088 | } |
b3b94faa | 1089 | |
7359a19c SW |
1090 | iput(dir); |
1091 | dir = tmp; | |
b3b94faa DT |
1092 | } |
1093 | ||
7359a19c | 1094 | iput(dir); |
b3b94faa DT |
1095 | |
1096 | return error; | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * gfs2_readlinki - return the contents of a symlink | |
1101 | * @ip: the symlink's inode | |
1102 | * @buf: a pointer to the buffer to be filled | |
1103 | * @len: a pointer to the length of @buf | |
1104 | * | |
1105 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1106 | * to be freed by the caller. | |
1107 | * | |
1108 | * Returns: errno | |
1109 | */ | |
1110 | ||
1111 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1112 | { | |
1113 | struct gfs2_holder i_gh; | |
1114 | struct buffer_head *dibh; | |
1115 | unsigned int x; | |
1116 | int error; | |
1117 | ||
1118 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1119 | error = gfs2_glock_nq_atime(&i_gh); | |
1120 | if (error) { | |
1121 | gfs2_holder_uninit(&i_gh); | |
1122 | return error; | |
1123 | } | |
1124 | ||
1125 | if (!ip->i_di.di_size) { | |
1126 | gfs2_consist_inode(ip); | |
1127 | error = -EIO; | |
1128 | goto out; | |
1129 | } | |
1130 | ||
1131 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1132 | if (error) | |
1133 | goto out; | |
1134 | ||
1135 | x = ip->i_di.di_size + 1; | |
1136 | if (x > *len) { | |
1137 | *buf = kmalloc(x, GFP_KERNEL); | |
1138 | if (!*buf) { | |
1139 | error = -ENOMEM; | |
1140 | goto out_brelse; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1145 | *len = x; | |
1146 | ||
feaa7bba | 1147 | out_brelse: |
b3b94faa | 1148 | brelse(dibh); |
feaa7bba | 1149 | out: |
b3b94faa | 1150 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1151 | return error; |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1156 | * conditionally update the inode's atime | |
1157 | * @gh: the holder to acquire | |
1158 | * | |
1159 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1160 | * Update if the difference between the current time and the inode's current | |
1161 | * atime is greater than an interval specified at mount. | |
1162 | * | |
1163 | * Returns: errno | |
1164 | */ | |
1165 | ||
1166 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1167 | { | |
1168 | struct gfs2_glock *gl = gh->gh_gl; | |
1169 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1170 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1171 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1172 | unsigned int state; |
1173 | int flags; | |
1174 | int error; | |
1175 | ||
1176 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1177 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1178 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1179 | return -EINVAL; | |
1180 | ||
1181 | state = gh->gh_state; | |
1182 | flags = gh->gh_flags; | |
1183 | ||
1184 | error = gfs2_glock_nq(gh); | |
1185 | if (error) | |
1186 | return error; | |
1187 | ||
1188 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1189 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1190 | return 0; | |
1191 | ||
1192 | curtime = get_seconds(); | |
1a7b1eed | 1193 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1194 | gfs2_glock_dq(gh); |
fd88de56 SW |
1195 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1196 | gh); | |
b3b94faa DT |
1197 | error = gfs2_glock_nq(gh); |
1198 | if (error) | |
1199 | return error; | |
1200 | ||
1201 | /* Verify that atime hasn't been updated while we were | |
1202 | trying to get exclusive lock. */ | |
1203 | ||
1204 | curtime = get_seconds(); | |
1a7b1eed | 1205 | if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { |
b3b94faa | 1206 | struct buffer_head *dibh; |
48516ced | 1207 | struct gfs2_dinode *di; |
b3b94faa DT |
1208 | |
1209 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1210 | if (error == -EROFS) | |
1211 | return 0; | |
1212 | if (error) | |
1213 | goto fail; | |
1214 | ||
1215 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1216 | if (error) | |
1217 | goto fail_end_trans; | |
1218 | ||
1a7b1eed | 1219 | ip->i_inode.i_atime.tv_sec = curtime; |
b3b94faa | 1220 | |
d4e9c4c3 | 1221 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 1222 | di = (struct gfs2_dinode *)dibh->b_data; |
1a7b1eed | 1223 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
b3b94faa DT |
1224 | brelse(dibh); |
1225 | ||
1226 | gfs2_trans_end(sdp); | |
1227 | } | |
1228 | ||
1229 | /* If someone else has asked for the glock, | |
1230 | unlock and let them have it. Then reacquire | |
1231 | in the original state. */ | |
1232 | if (gfs2_glock_is_blocking(gl)) { | |
1233 | gfs2_glock_dq(gh); | |
1234 | gfs2_holder_reinit(state, flags, gh); | |
1235 | return gfs2_glock_nq(gh); | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | return 0; | |
1240 | ||
feaa7bba | 1241 | fail_end_trans: |
b3b94faa | 1242 | gfs2_trans_end(sdp); |
feaa7bba | 1243 | fail: |
b3b94faa | 1244 | gfs2_glock_dq(gh); |
b3b94faa DT |
1245 | return error; |
1246 | } | |
1247 | ||
b3b94faa DT |
1248 | static int |
1249 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1250 | { | |
1251 | struct buffer_head *dibh; | |
1252 | int error; | |
1253 | ||
1254 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1255 | if (!error) { | |
feaa7bba SW |
1256 | error = inode_setattr(&ip->i_inode, attr); |
1257 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
d4e9c4c3 | 1258 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1259 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1260 | brelse(dibh); |
1261 | } | |
1262 | return error; | |
1263 | } | |
1264 | ||
1265 | /** | |
1266 | * gfs2_setattr_simple - | |
1267 | * @ip: | |
1268 | * @attr: | |
1269 | * | |
1270 | * Called with a reference on the vnode. | |
1271 | * | |
1272 | * Returns: errno | |
1273 | */ | |
1274 | ||
1275 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1276 | { | |
1277 | int error; | |
1278 | ||
5c676f6d | 1279 | if (current->journal_info) |
b3b94faa DT |
1280 | return __gfs2_setattr_simple(ip, attr); |
1281 | ||
feaa7bba | 1282 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1283 | if (error) |
1284 | return error; | |
1285 | ||
1286 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1287 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1288 | return error; |
1289 | } | |
1290 |