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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 DT |
40 | |
41 | /** | |
4340fe62 | 42 | * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode |
b3b94faa DT |
43 | * @ip: The GFS2 inode (with embedded disk inode data) |
44 | * @inode: The Linux VFS inode | |
45 | * | |
46 | */ | |
47 | ||
4340fe62 | 48 | void gfs2_inode_attr_in(struct gfs2_inode *ip) |
b3b94faa | 49 | { |
4340fe62 | 50 | struct inode *inode = &ip->i_inode; |
3ca68df6 | 51 | struct gfs2_dinode_host *di = &ip->i_di; |
4340fe62 SW |
52 | |
53 | inode->i_ino = ip->i_num.no_addr; | |
b3b94faa | 54 | |
c2668711 | 55 | switch (di->di_mode & S_IFMT) { |
b3b94faa DT |
56 | case S_IFBLK: |
57 | case S_IFCHR: | |
c2668711 | 58 | inode->i_rdev = MKDEV(di->di_major, di->di_minor); |
b3b94faa DT |
59 | break; |
60 | default: | |
61 | inode->i_rdev = 0; | |
62 | break; | |
63 | }; | |
64 | ||
c2668711 SW |
65 | inode->i_mode = di->di_mode; |
66 | inode->i_nlink = di->di_nlink; | |
67 | inode->i_uid = di->di_uid; | |
68 | inode->i_gid = di->di_gid; | |
69 | i_size_write(inode, di->di_size); | |
70 | inode->i_atime.tv_sec = di->di_atime; | |
71 | inode->i_mtime.tv_sec = di->di_mtime; | |
72 | inode->i_ctime.tv_sec = di->di_ctime; | |
b3b94faa DT |
73 | inode->i_atime.tv_nsec = 0; |
74 | inode->i_mtime.tv_nsec = 0; | |
75 | inode->i_ctime.tv_nsec = 0; | |
c2668711 | 76 | inode->i_blocks = di->di_blocks << |
feaa7bba | 77 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa | 78 | |
c2668711 | 79 | if (di->di_flags & GFS2_DIF_IMMUTABLE) |
b3b94faa DT |
80 | inode->i_flags |= S_IMMUTABLE; |
81 | else | |
82 | inode->i_flags &= ~S_IMMUTABLE; | |
83 | ||
c2668711 | 84 | if (di->di_flags & GFS2_DIF_APPENDONLY) |
b3b94faa DT |
85 | inode->i_flags |= S_APPEND; |
86 | else | |
87 | inode->i_flags &= ~S_APPEND; | |
88 | } | |
89 | ||
b3b94faa DT |
90 | /** |
91 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
92 | * @ip: The GFS2 inode | |
93 | * | |
94 | * Only copy out the attributes that we want the VFS layer | |
95 | * to be able to modify. | |
96 | */ | |
97 | ||
98 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
99 | { | |
feaa7bba | 100 | struct inode *inode = &ip->i_inode; |
3ca68df6 | 101 | struct gfs2_dinode_host *di = &ip->i_di; |
feaa7bba | 102 | gfs2_assert_withdraw(GFS2_SB(inode), |
75d3b817 SW |
103 | (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
104 | di->di_mode = inode->i_mode; | |
105 | di->di_uid = inode->i_uid; | |
106 | di->di_gid = inode->i_gid; | |
107 | di->di_atime = inode->i_atime.tv_sec; | |
108 | di->di_mtime = inode->i_mtime.tv_sec; | |
109 | di->di_ctime = inode->i_ctime.tv_sec; | |
b3b94faa DT |
110 | } |
111 | ||
feaa7bba SW |
112 | static int iget_test(struct inode *inode, void *opaque) |
113 | { | |
114 | struct gfs2_inode *ip = GFS2_I(inode); | |
629a21e7 | 115 | struct gfs2_inum_host *inum = opaque; |
feaa7bba SW |
116 | |
117 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
118 | return 1; | |
b3b94faa | 119 | |
feaa7bba SW |
120 | return 0; |
121 | } | |
122 | ||
123 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 124 | { |
feaa7bba | 125 | struct gfs2_inode *ip = GFS2_I(inode); |
629a21e7 | 126 | struct gfs2_inum_host *inum = opaque; |
b3b94faa | 127 | |
feaa7bba SW |
128 | ip->i_num = *inum; |
129 | return 0; | |
130 | } | |
b3b94faa | 131 | |
629a21e7 | 132 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
133 | { |
134 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
135 | iget_test, inum); | |
136 | } | |
b3b94faa | 137 | |
629a21e7 | 138 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
139 | { |
140 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
141 | iget_test, iget_set, inum); | |
b3b94faa DT |
142 | } |
143 | ||
144 | /** | |
feaa7bba SW |
145 | * gfs2_inode_lookup - Lookup an inode |
146 | * @sb: The super block | |
147 | * @inum: The inode number | |
148 | * @type: The type of the inode | |
b3b94faa | 149 | * |
feaa7bba | 150 | * Returns: A VFS inode, or an error |
b3b94faa DT |
151 | */ |
152 | ||
629a21e7 | 153 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
b3b94faa | 154 | { |
feaa7bba SW |
155 | struct inode *inode = gfs2_iget(sb, inum); |
156 | struct gfs2_inode *ip = GFS2_I(inode); | |
157 | struct gfs2_glock *io_gl; | |
158 | int error; | |
b3b94faa | 159 | |
26d83ded SW |
160 | if (!inode) |
161 | return ERR_PTR(-ENOBUFS); | |
162 | ||
feaa7bba SW |
163 | if (inode->i_state & I_NEW) { |
164 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
165 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 166 | inode->i_private = ip; |
feaa7bba SW |
167 | inode->i_mode = mode; |
168 | ||
169 | if (S_ISREG(mode)) { | |
170 | inode->i_op = &gfs2_file_iops; | |
171 | inode->i_fop = &gfs2_file_fops; | |
172 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
173 | } else if (S_ISDIR(mode)) { | |
174 | inode->i_op = &gfs2_dir_iops; | |
175 | inode->i_fop = &gfs2_dir_fops; | |
176 | } else if (S_ISLNK(mode)) { | |
177 | inode->i_op = &gfs2_symlink_iops; | |
178 | } else { | |
179 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 180 | } |
b3b94faa | 181 | |
feaa7bba SW |
182 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
183 | if (unlikely(error)) | |
184 | goto fail; | |
185 | ip->i_gl->gl_object = ip; | |
b3b94faa | 186 | |
feaa7bba SW |
187 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
188 | if (unlikely(error)) | |
189 | goto fail_put; | |
b3b94faa | 190 | |
feaa7bba SW |
191 | ip->i_vn = ip->i_gl->gl_vn - 1; |
192 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
193 | if (unlikely(error)) | |
194 | goto fail_iopen; | |
b3b94faa | 195 | |
feaa7bba SW |
196 | gfs2_glock_put(io_gl); |
197 | unlock_new_inode(inode); | |
198 | } | |
b3b94faa DT |
199 | |
200 | return inode; | |
feaa7bba SW |
201 | fail_iopen: |
202 | gfs2_glock_put(io_gl); | |
203 | fail_put: | |
204 | ip->i_gl->gl_object = NULL; | |
205 | gfs2_glock_put(ip->i_gl); | |
206 | fail: | |
207 | iput(inode); | |
208 | return ERR_PTR(error); | |
b3b94faa DT |
209 | } |
210 | ||
ea744d01 SW |
211 | static void gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
212 | { | |
213 | struct gfs2_dinode_host *di = &ip->i_di; | |
214 | const struct gfs2_dinode *str = buf; | |
215 | ||
216 | gfs2_meta_header_in(&di->di_header, buf); | |
217 | gfs2_inum_in(&di->di_num, &str->di_num); | |
218 | ||
219 | di->di_mode = be32_to_cpu(str->di_mode); | |
220 | di->di_uid = be32_to_cpu(str->di_uid); | |
221 | di->di_gid = be32_to_cpu(str->di_gid); | |
222 | di->di_nlink = be32_to_cpu(str->di_nlink); | |
223 | di->di_size = be64_to_cpu(str->di_size); | |
224 | di->di_blocks = be64_to_cpu(str->di_blocks); | |
225 | di->di_atime = be64_to_cpu(str->di_atime); | |
226 | di->di_mtime = be64_to_cpu(str->di_mtime); | |
227 | di->di_ctime = be64_to_cpu(str->di_ctime); | |
228 | di->di_major = be32_to_cpu(str->di_major); | |
229 | di->di_minor = be32_to_cpu(str->di_minor); | |
230 | ||
231 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
232 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
233 | di->di_generation = be64_to_cpu(str->di_generation); | |
234 | ||
235 | di->di_flags = be32_to_cpu(str->di_flags); | |
236 | di->di_payload_format = be32_to_cpu(str->di_payload_format); | |
237 | di->di_height = be16_to_cpu(str->di_height); | |
238 | ||
239 | di->di_depth = be16_to_cpu(str->di_depth); | |
240 | di->di_entries = be32_to_cpu(str->di_entries); | |
241 | ||
242 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
243 | } | |
244 | ||
b3b94faa DT |
245 | /** |
246 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
247 | * @ip: The GFS2 inode | |
248 | * | |
249 | * Returns: errno | |
250 | */ | |
251 | ||
252 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
253 | { | |
254 | struct buffer_head *dibh; | |
255 | int error; | |
256 | ||
257 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
258 | if (error) | |
259 | return error; | |
260 | ||
feaa7bba | 261 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
262 | brelse(dibh); |
263 | return -EIO; | |
264 | } | |
265 | ||
891ea147 | 266 | gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa DT |
267 | |
268 | brelse(dibh); | |
269 | ||
270 | if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { | |
271 | if (gfs2_consist_inode(ip)) | |
272 | gfs2_dinode_print(&ip->i_di); | |
273 | return -EIO; | |
274 | } | |
275 | if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) | |
276 | return -ESTALE; | |
277 | ||
278 | ip->i_vn = ip->i_gl->gl_vn; | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
feaa7bba | 283 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 284 | { |
feaa7bba | 285 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
286 | struct gfs2_alloc *al; |
287 | struct gfs2_rgrpd *rgd; | |
288 | int error; | |
289 | ||
290 | if (ip->i_di.di_blocks != 1) { | |
291 | if (gfs2_consist_inode(ip)) | |
292 | gfs2_dinode_print(&ip->i_di); | |
293 | return -EIO; | |
294 | } | |
295 | ||
296 | al = gfs2_alloc_get(ip); | |
297 | ||
298 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
299 | if (error) | |
300 | goto out; | |
301 | ||
302 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
303 | if (error) | |
304 | goto out_qs; | |
305 | ||
306 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
307 | if (!rgd) { | |
308 | gfs2_consist_inode(ip); | |
309 | error = -EIO; | |
310 | goto out_rindex_relse; | |
311 | } | |
312 | ||
313 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
314 | &al->al_rgd_gh); | |
315 | if (error) | |
316 | goto out_rindex_relse; | |
317 | ||
420b9e5e | 318 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
319 | if (error) |
320 | goto out_rg_gunlock; | |
321 | ||
322 | gfs2_trans_add_gl(ip->i_gl); | |
323 | ||
324 | gfs2_free_di(rgd, ip); | |
325 | ||
b3b94faa DT |
326 | gfs2_trans_end(sdp); |
327 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
328 | ||
feaa7bba | 329 | out_rg_gunlock: |
b3b94faa | 330 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 331 | out_rindex_relse: |
b3b94faa | 332 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 333 | out_qs: |
b3b94faa | 334 | gfs2_quota_unhold(ip); |
36327521 | 335 | out: |
feaa7bba | 336 | gfs2_alloc_put(ip); |
b3b94faa DT |
337 | return error; |
338 | } | |
339 | ||
b3b94faa DT |
340 | /** |
341 | * gfs2_change_nlink - Change nlink count on inode | |
342 | * @ip: The GFS2 inode | |
343 | * @diff: The change in the nlink count required | |
344 | * | |
345 | * Returns: errno | |
346 | */ | |
347 | ||
348 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
349 | { | |
feaa7bba | 350 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa | 351 | struct buffer_head *dibh; |
cd915493 | 352 | u32 nlink; |
b3b94faa DT |
353 | int error; |
354 | ||
29937ac6 | 355 | BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); |
b3b94faa DT |
356 | nlink = ip->i_di.di_nlink + diff; |
357 | ||
358 | /* If we are reducing the nlink count, but the new value ends up being | |
359 | bigger than the old one, we must have underflowed. */ | |
360 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
361 | if (gfs2_consist_inode(ip)) | |
362 | gfs2_dinode_print(&ip->i_di); | |
363 | return -EIO; | |
364 | } | |
365 | ||
366 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
367 | if (error) | |
368 | return error; | |
369 | ||
370 | ip->i_di.di_nlink = nlink; | |
371 | ip->i_di.di_ctime = get_seconds(); | |
29937ac6 | 372 | ip->i_inode.i_nlink = nlink; |
b3b94faa | 373 | |
d4e9c4c3 | 374 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 375 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 376 | brelse(dibh); |
feaa7bba | 377 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 378 | |
feaa7bba SW |
379 | if (ip->i_di.di_nlink == 0) { |
380 | struct gfs2_rgrpd *rgd; | |
381 | struct gfs2_holder ri_gh, rg_gh; | |
382 | ||
383 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
384 | if (error) | |
385 | goto out; | |
386 | error = -EIO; | |
387 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
388 | if (!rgd) | |
389 | goto out_norgrp; | |
390 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
391 | if (error) | |
392 | goto out_norgrp; | |
393 | ||
f92a0b6f | 394 | clear_nlink(&ip->i_inode); |
feaa7bba SW |
395 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
396 | gfs2_glock_dq_uninit(&rg_gh); | |
397 | out_norgrp: | |
398 | gfs2_glock_dq_uninit(&ri_gh); | |
399 | } | |
400 | out: | |
401 | return error; | |
b3b94faa DT |
402 | } |
403 | ||
c752666c SW |
404 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
405 | { | |
406 | struct qstr qstr; | |
71b86f56 | 407 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
408 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
409 | } | |
410 | ||
411 | ||
b3b94faa DT |
412 | /** |
413 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
414 | * @d_gh: An initialized holder for the directory glock | |
415 | * @name: The name of the inode to look for | |
416 | * @is_root: If 1, ignore the caller's permissions | |
417 | * @i_gh: An uninitialized holder for the new inode glock | |
418 | * | |
419 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
420 | * @is_root is true. | |
421 | * | |
422 | * Returns: errno | |
423 | */ | |
424 | ||
feaa7bba SW |
425 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
426 | int is_root, struct nameidata *nd) | |
b3b94faa | 427 | { |
c9fd4307 | 428 | struct super_block *sb = dir->i_sb; |
feaa7bba | 429 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 430 | struct gfs2_holder d_gh; |
629a21e7 | 431 | struct gfs2_inum_host inum; |
b3b94faa | 432 | unsigned int type; |
7359a19c | 433 | int error = 0; |
c752666c | 434 | struct inode *inode = NULL; |
b3b94faa DT |
435 | |
436 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 437 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 438 | |
c752666c SW |
439 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
440 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
441 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
442 | igrab(dir); |
443 | return dir; | |
b3b94faa DT |
444 | } |
445 | ||
446 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
447 | if (error) | |
c752666c | 448 | return ERR_PTR(error); |
b3b94faa DT |
449 | |
450 | if (!is_root) { | |
faf450ef | 451 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
452 | if (error) |
453 | goto out; | |
454 | } | |
455 | ||
c752666c | 456 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
457 | if (error) |
458 | goto out; | |
459 | ||
feaa7bba | 460 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 461 | |
7359a19c | 462 | out: |
b3b94faa | 463 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
464 | if (error == -ENOENT) |
465 | return NULL; | |
feaa7bba | 466 | return inode; |
b3b94faa DT |
467 | } |
468 | ||
cd915493 | 469 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 470 | { |
feaa7bba | 471 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 472 | struct buffer_head *bh; |
e6972647 | 473 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
474 | int error; |
475 | ||
476 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
477 | if (error) | |
478 | return error; | |
f55ab26a | 479 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
480 | |
481 | error = gfs2_meta_inode_buffer(ip, &bh); | |
482 | if (error) { | |
f55ab26a | 483 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
484 | gfs2_trans_end(sdp); |
485 | return error; | |
486 | } | |
487 | ||
488 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
489 | ||
490 | if (ir.ir_length) { | |
491 | *formal_ino = ir.ir_start++; | |
492 | ir.ir_length--; | |
d4e9c4c3 | 493 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
494 | gfs2_inum_range_out(&ir, |
495 | bh->b_data + sizeof(struct gfs2_dinode)); | |
496 | brelse(bh); | |
f55ab26a | 497 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
498 | gfs2_trans_end(sdp); |
499 | return 0; | |
500 | } | |
501 | ||
502 | brelse(bh); | |
503 | ||
f55ab26a | 504 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
505 | gfs2_trans_end(sdp); |
506 | ||
507 | return 1; | |
508 | } | |
509 | ||
cd915493 | 510 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 511 | { |
feaa7bba SW |
512 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
513 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
514 | struct gfs2_holder gh; |
515 | struct buffer_head *bh; | |
e6972647 | 516 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
517 | int error; |
518 | ||
519 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
520 | if (error) | |
521 | return error; | |
522 | ||
523 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
524 | if (error) | |
525 | goto out; | |
f55ab26a | 526 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
527 | |
528 | error = gfs2_meta_inode_buffer(ip, &bh); | |
529 | if (error) | |
530 | goto out_end_trans; | |
907b9bce | 531 | |
b3b94faa DT |
532 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
533 | ||
534 | if (!ir.ir_length) { | |
535 | struct buffer_head *m_bh; | |
cd915493 | 536 | u64 x, y; |
b44b84d7 | 537 | __be64 z; |
b3b94faa DT |
538 | |
539 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
540 | if (error) | |
541 | goto out_brelse; | |
542 | ||
b44b84d7 AV |
543 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
544 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
545 | ir.ir_start = x; |
546 | ir.ir_length = GFS2_INUM_QUANTUM; | |
547 | x += GFS2_INUM_QUANTUM; | |
548 | if (x < y) | |
549 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 550 | z = cpu_to_be64(x); |
d4e9c4c3 | 551 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 552 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
553 | |
554 | brelse(m_bh); | |
555 | } | |
556 | ||
557 | *formal_ino = ir.ir_start++; | |
558 | ir.ir_length--; | |
559 | ||
d4e9c4c3 | 560 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
561 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
562 | ||
420b9e5e | 563 | out_brelse: |
b3b94faa | 564 | brelse(bh); |
420b9e5e | 565 | out_end_trans: |
f55ab26a | 566 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 567 | gfs2_trans_end(sdp); |
420b9e5e | 568 | out: |
b3b94faa | 569 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
570 | return error; |
571 | } | |
572 | ||
cd915493 | 573 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
574 | { |
575 | int error; | |
576 | ||
577 | error = pick_formal_ino_1(sdp, inum); | |
578 | if (error <= 0) | |
579 | return error; | |
580 | ||
581 | error = pick_formal_ino_2(sdp, inum); | |
582 | ||
583 | return error; | |
584 | } | |
585 | ||
586 | /** | |
587 | * create_ok - OK to create a new on-disk inode here? | |
588 | * @dip: Directory in which dinode is to be created | |
589 | * @name: Name of new dinode | |
590 | * @mode: | |
591 | * | |
592 | * Returns: errno | |
593 | */ | |
594 | ||
feaa7bba | 595 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
596 | unsigned int mode) |
597 | { | |
598 | int error; | |
599 | ||
faf450ef | 600 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
601 | if (error) |
602 | return error; | |
603 | ||
604 | /* Don't create entries in an unlinked directory */ | |
605 | if (!dip->i_di.di_nlink) | |
606 | return -EPERM; | |
607 | ||
feaa7bba | 608 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
609 | switch (error) { |
610 | case -ENOENT: | |
611 | error = 0; | |
612 | break; | |
613 | case 0: | |
614 | return -EEXIST; | |
615 | default: | |
616 | return error; | |
617 | } | |
618 | ||
cd915493 | 619 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 620 | return -EFBIG; |
cd915493 | 621 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1) |
b3b94faa DT |
622 | return -EMLINK; |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
628 | unsigned int *uid, unsigned int *gid) | |
629 | { | |
feaa7bba | 630 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
420b9e5e | 631 | (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) { |
b3b94faa DT |
632 | if (S_ISDIR(*mode)) |
633 | *mode |= S_ISUID; | |
634 | else if (dip->i_di.di_uid != current->fsuid) | |
635 | *mode &= ~07111; | |
636 | *uid = dip->i_di.di_uid; | |
637 | } else | |
638 | *uid = current->fsuid; | |
639 | ||
640 | if (dip->i_di.di_mode & S_ISGID) { | |
641 | if (S_ISDIR(*mode)) | |
642 | *mode |= S_ISGID; | |
643 | *gid = dip->i_di.di_gid; | |
644 | } else | |
645 | *gid = current->fsgid; | |
646 | } | |
647 | ||
629a21e7 | 648 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 649 | u64 *generation) |
b3b94faa | 650 | { |
feaa7bba | 651 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
652 | int error; |
653 | ||
654 | gfs2_alloc_get(dip); | |
655 | ||
656 | dip->i_alloc.al_requested = RES_DINODE; | |
657 | error = gfs2_inplace_reserve(dip); | |
658 | if (error) | |
659 | goto out; | |
660 | ||
feaa7bba | 661 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
662 | if (error) |
663 | goto out_ipreserv; | |
664 | ||
4340fe62 | 665 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
666 | |
667 | gfs2_trans_end(sdp); | |
668 | ||
4340fe62 | 669 | out_ipreserv: |
b3b94faa | 670 | gfs2_inplace_release(dip); |
4340fe62 | 671 | out: |
b3b94faa | 672 | gfs2_alloc_put(dip); |
b3b94faa DT |
673 | return error; |
674 | } | |
675 | ||
676 | /** | |
677 | * init_dinode - Fill in a new dinode structure | |
678 | * @dip: the directory this inode is being created in | |
679 | * @gl: The glock covering the new inode | |
680 | * @inum: the inode number | |
681 | * @mode: the file permissions | |
682 | * @uid: | |
683 | * @gid: | |
684 | * | |
685 | */ | |
686 | ||
687 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 688 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 SW |
689 | unsigned int uid, unsigned int gid, |
690 | const u64 *generation) | |
b3b94faa | 691 | { |
feaa7bba | 692 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 693 | struct gfs2_dinode *di; |
b3b94faa DT |
694 | struct buffer_head *dibh; |
695 | ||
696 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 697 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
698 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
699 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
700 | di = (struct gfs2_dinode *)dibh->b_data; |
701 | ||
2442a098 SW |
702 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
703 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
704 | di->di_mode = cpu_to_be32(mode); |
705 | di->di_uid = cpu_to_be32(uid); | |
706 | di->di_gid = cpu_to_be32(gid); | |
707 | di->di_nlink = cpu_to_be32(0); | |
708 | di->di_size = cpu_to_be64(0); | |
709 | di->di_blocks = cpu_to_be64(1); | |
710 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
711 | di->di_major = di->di_minor = cpu_to_be32(0); | |
712 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
4340fe62 | 713 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 714 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
715 | |
716 | if (S_ISREG(mode)) { | |
717 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
718 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 719 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
720 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
721 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 722 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 723 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
724 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
725 | GFS2_DIF_INHERIT_DIRECTIO); | |
726 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
727 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
728 | } |
729 | ||
b96ca4fa | 730 | di->__pad1 = 0; |
b2a580d8 | 731 | di->di_payload_format = cpu_to_be32(0); |
b96ca4fa SW |
732 | di->di_height = cpu_to_be32(0); |
733 | di->__pad2 = 0; | |
734 | di->__pad3 = 0; | |
735 | di->di_depth = cpu_to_be16(0); | |
736 | di->di_entries = cpu_to_be32(0); | |
737 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
738 | di->di_eattr = cpu_to_be64(0); | |
739 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
740 | ||
b3b94faa DT |
741 | brelse(dibh); |
742 | } | |
743 | ||
744 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 745 | unsigned int mode, const struct gfs2_inum_host *inum, |
4340fe62 | 746 | const u64 *generation) |
b3b94faa | 747 | { |
feaa7bba | 748 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
749 | unsigned int uid, gid; |
750 | int error; | |
751 | ||
752 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
753 | gfs2_alloc_get(dip); |
754 | ||
755 | error = gfs2_quota_lock(dip, uid, gid); | |
756 | if (error) | |
757 | goto out; | |
758 | ||
759 | error = gfs2_quota_check(dip, uid, gid); | |
760 | if (error) | |
761 | goto out_quota; | |
762 | ||
feaa7bba | 763 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
764 | if (error) |
765 | goto out_quota; | |
766 | ||
4340fe62 | 767 | init_dinode(dip, gl, inum, mode, uid, gid, generation); |
b3b94faa | 768 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
769 | gfs2_trans_end(sdp); |
770 | ||
feaa7bba | 771 | out_quota: |
b3b94faa | 772 | gfs2_quota_unlock(dip); |
feaa7bba | 773 | out: |
b3b94faa | 774 | gfs2_alloc_put(dip); |
b3b94faa DT |
775 | return error; |
776 | } | |
777 | ||
feaa7bba SW |
778 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
779 | struct gfs2_inode *ip) | |
b3b94faa | 780 | { |
feaa7bba | 781 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
782 | struct gfs2_alloc *al; |
783 | int alloc_required; | |
784 | struct buffer_head *dibh; | |
785 | int error; | |
786 | ||
787 | al = gfs2_alloc_get(dip); | |
788 | ||
789 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
790 | if (error) | |
791 | goto fail; | |
792 | ||
feaa7bba | 793 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
794 | if (alloc_required < 0) |
795 | goto fail; | |
b3b94faa DT |
796 | if (alloc_required) { |
797 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
798 | dip->i_di.di_gid); | |
799 | if (error) | |
800 | goto fail_quota_locks; | |
801 | ||
802 | al->al_requested = sdp->sd_max_dirres; | |
803 | ||
804 | error = gfs2_inplace_reserve(dip); | |
805 | if (error) | |
806 | goto fail_quota_locks; | |
807 | ||
320dd101 | 808 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 809 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 810 | 2 * RES_DINODE + |
b3b94faa DT |
811 | RES_STATFS + RES_QUOTA, 0); |
812 | if (error) | |
813 | goto fail_ipreserv; | |
814 | } else { | |
feaa7bba | 815 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
816 | if (error) |
817 | goto fail_quota_locks; | |
818 | } | |
819 | ||
feaa7bba | 820 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
821 | if (error) |
822 | goto fail_end_trans; | |
823 | ||
824 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
825 | if (error) | |
826 | goto fail_end_trans; | |
827 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 828 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 829 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 830 | brelse(dibh); |
b3b94faa DT |
831 | return 0; |
832 | ||
320dd101 | 833 | fail_end_trans: |
b3b94faa DT |
834 | gfs2_trans_end(sdp); |
835 | ||
320dd101 | 836 | fail_ipreserv: |
b3b94faa DT |
837 | if (dip->i_alloc.al_rgd) |
838 | gfs2_inplace_release(dip); | |
839 | ||
320dd101 | 840 | fail_quota_locks: |
b3b94faa DT |
841 | gfs2_quota_unlock(dip); |
842 | ||
320dd101 | 843 | fail: |
b3b94faa | 844 | gfs2_alloc_put(dip); |
b3b94faa DT |
845 | return error; |
846 | } | |
847 | ||
fcb47e0b RH |
848 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
849 | { | |
850 | int err; | |
851 | size_t len; | |
852 | void *value; | |
853 | char *name; | |
854 | struct gfs2_ea_request er; | |
855 | ||
856 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
857 | &name, &value, &len); | |
858 | ||
859 | if (err) { | |
860 | if (err == -EOPNOTSUPP) | |
861 | return 0; | |
862 | return err; | |
863 | } | |
864 | ||
865 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
866 | ||
867 | er.er_type = GFS2_EATYPE_SECURITY; | |
868 | er.er_name = name; | |
869 | er.er_data = value; | |
870 | er.er_name_len = strlen(name); | |
871 | er.er_data_len = len; | |
872 | ||
873 | err = gfs2_ea_set_i(ip, &er); | |
874 | ||
875 | kfree(value); | |
876 | kfree(name); | |
877 | ||
878 | return err; | |
879 | } | |
880 | ||
b3b94faa DT |
881 | /** |
882 | * gfs2_createi - Create a new inode | |
883 | * @ghs: An array of two holders | |
884 | * @name: The name of the new file | |
885 | * @mode: the permissions on the new inode | |
886 | * | |
887 | * @ghs[0] is an initialized holder for the directory | |
888 | * @ghs[1] is the holder for the inode lock | |
889 | * | |
7359a19c | 890 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
891 | * file are held. A transaction has been started and an inplace reservation |
892 | * is held, as well. | |
893 | * | |
7359a19c | 894 | * Returns: An inode |
b3b94faa DT |
895 | */ |
896 | ||
feaa7bba | 897 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
568f4c96 | 898 | unsigned int mode) |
b3b94faa | 899 | { |
7359a19c | 900 | struct inode *inode; |
5c676f6d | 901 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
902 | struct inode *dir = &dip->i_inode; |
903 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 904 | struct gfs2_inum_host inum; |
b3b94faa | 905 | int error; |
4340fe62 | 906 | u64 generation; |
b3b94faa DT |
907 | |
908 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 909 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 910 | |
b3b94faa DT |
911 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
912 | error = gfs2_glock_nq(ghs); | |
913 | if (error) | |
914 | goto fail; | |
915 | ||
916 | error = create_ok(dip, name, mode); | |
917 | if (error) | |
918 | goto fail_gunlock; | |
919 | ||
feaa7bba | 920 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
921 | if (error) |
922 | goto fail_gunlock; | |
923 | ||
4340fe62 | 924 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
925 | if (error) |
926 | goto fail_gunlock; | |
927 | ||
feaa7bba | 928 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
929 | gfs2_glock_dq(ghs); |
930 | ||
feaa7bba | 931 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
932 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
933 | GL_SKIP, ghs + 1); | |
b3b94faa | 934 | if (error) { |
7359a19c | 935 | return ERR_PTR(error); |
b3b94faa DT |
936 | } |
937 | ||
938 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
939 | error = gfs2_glock_nq(ghs); | |
940 | if (error) { | |
941 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 942 | return ERR_PTR(error); |
b3b94faa DT |
943 | } |
944 | ||
945 | error = create_ok(dip, name, mode); | |
946 | if (error) | |
947 | goto fail_gunlock2; | |
948 | } else { | |
feaa7bba | 949 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
950 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
951 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
952 | if (error) |
953 | goto fail_gunlock; | |
954 | } | |
955 | ||
4340fe62 | 956 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); |
b3b94faa DT |
957 | if (error) |
958 | goto fail_gunlock2; | |
959 | ||
feaa7bba SW |
960 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
961 | if (IS_ERR(inode)) | |
b3b94faa DT |
962 | goto fail_gunlock2; |
963 | ||
feaa7bba | 964 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
965 | if (error) |
966 | goto fail_iput; | |
967 | ||
feaa7bba | 968 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
969 | if (error) |
970 | goto fail_iput; | |
971 | ||
fcb47e0b RH |
972 | error = gfs2_security_init(dip, GFS2_I(inode)); |
973 | if (error) | |
974 | goto fail_iput; | |
975 | ||
feaa7bba | 976 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
977 | if (error) |
978 | goto fail_iput; | |
979 | ||
7359a19c SW |
980 | if (!inode) |
981 | return ERR_PTR(-ENOMEM); | |
982 | return inode; | |
b3b94faa | 983 | |
320dd101 | 984 | fail_iput: |
feaa7bba | 985 | iput(inode); |
320dd101 | 986 | fail_gunlock2: |
b3b94faa | 987 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 988 | fail_gunlock: |
b3b94faa | 989 | gfs2_glock_dq(ghs); |
320dd101 | 990 | fail: |
7359a19c | 991 | return ERR_PTR(error); |
b3b94faa DT |
992 | } |
993 | ||
b3b94faa DT |
994 | /** |
995 | * gfs2_rmdiri - Remove a directory | |
996 | * @dip: The parent directory of the directory to be removed | |
997 | * @name: The name of the directory to be removed | |
998 | * @ip: The GFS2 inode of the directory to be removed | |
999 | * | |
1000 | * Assumes Glocks on dip and ip are held | |
1001 | * | |
1002 | * Returns: errno | |
1003 | */ | |
1004 | ||
feaa7bba SW |
1005 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
1006 | struct gfs2_inode *ip) | |
b3b94faa | 1007 | { |
b3b94faa DT |
1008 | struct qstr dotname; |
1009 | int error; | |
1010 | ||
1011 | if (ip->i_di.di_entries != 2) { | |
1012 | if (gfs2_consist_inode(ip)) | |
1013 | gfs2_dinode_print(&ip->i_di); | |
1014 | return -EIO; | |
1015 | } | |
1016 | ||
1017 | error = gfs2_dir_del(dip, name); | |
1018 | if (error) | |
1019 | return error; | |
1020 | ||
1021 | error = gfs2_change_nlink(dip, -1); | |
1022 | if (error) | |
1023 | return error; | |
1024 | ||
71b86f56 | 1025 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
1026 | error = gfs2_dir_del(ip, &dotname); |
1027 | if (error) | |
1028 | return error; | |
1029 | ||
feaa7bba | 1030 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
1031 | error = gfs2_dir_del(ip, &dotname); |
1032 | if (error) | |
1033 | return error; | |
1034 | ||
1035 | error = gfs2_change_nlink(ip, -2); | |
1036 | if (error) | |
1037 | return error; | |
1038 | ||
b3b94faa DT |
1039 | return error; |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1044 | * @dip: the directory | |
1045 | * @name: the name of the file | |
1046 | * @ip: the inode | |
1047 | * | |
1048 | * Assumes that the lock on (at least) @dip is held. | |
1049 | * | |
1050 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1051 | */ | |
1052 | ||
feaa7bba | 1053 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1054 | struct gfs2_inode *ip) |
1055 | { | |
629a21e7 | 1056 | struct gfs2_inum_host inum; |
b3b94faa DT |
1057 | unsigned int type; |
1058 | int error; | |
1059 | ||
feaa7bba | 1060 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1061 | return -EPERM; |
1062 | ||
1063 | if ((dip->i_di.di_mode & S_ISVTX) && | |
1064 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 1065 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
1066 | return -EPERM; |
1067 | ||
feaa7bba | 1068 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1069 | return -EPERM; |
1070 | ||
faf450ef | 1071 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1072 | if (error) |
1073 | return error; | |
1074 | ||
feaa7bba | 1075 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1076 | if (error) |
1077 | return error; | |
1078 | ||
1079 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1080 | return -ENOENT; | |
1081 | ||
1082 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1083 | gfs2_consist_inode(dip); | |
1084 | return -EIO; | |
1085 | } | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1092 | * @this: move this | |
1093 | * @to: to here | |
1094 | * | |
1095 | * Follow @to back to the root and make sure we don't encounter @this | |
1096 | * Assumes we already hold the rename lock. | |
1097 | * | |
1098 | * Returns: errno | |
1099 | */ | |
1100 | ||
1101 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1102 | { | |
feaa7bba | 1103 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1104 | struct super_block *sb = dir->i_sb; |
7359a19c | 1105 | struct inode *tmp; |
b3b94faa DT |
1106 | struct qstr dotdot; |
1107 | int error = 0; | |
1108 | ||
71b86f56 | 1109 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1110 | |
7359a19c | 1111 | igrab(dir); |
b3b94faa DT |
1112 | |
1113 | for (;;) { | |
feaa7bba | 1114 | if (dir == &this->i_inode) { |
b3b94faa DT |
1115 | error = -EINVAL; |
1116 | break; | |
1117 | } | |
c9fd4307 | 1118 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1119 | error = 0; |
1120 | break; | |
1121 | } | |
1122 | ||
c752666c SW |
1123 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1124 | if (IS_ERR(tmp)) { | |
1125 | error = PTR_ERR(tmp); | |
b3b94faa | 1126 | break; |
c752666c | 1127 | } |
b3b94faa | 1128 | |
7359a19c SW |
1129 | iput(dir); |
1130 | dir = tmp; | |
b3b94faa DT |
1131 | } |
1132 | ||
7359a19c | 1133 | iput(dir); |
b3b94faa DT |
1134 | |
1135 | return error; | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * gfs2_readlinki - return the contents of a symlink | |
1140 | * @ip: the symlink's inode | |
1141 | * @buf: a pointer to the buffer to be filled | |
1142 | * @len: a pointer to the length of @buf | |
1143 | * | |
1144 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1145 | * to be freed by the caller. | |
1146 | * | |
1147 | * Returns: errno | |
1148 | */ | |
1149 | ||
1150 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1151 | { | |
1152 | struct gfs2_holder i_gh; | |
1153 | struct buffer_head *dibh; | |
1154 | unsigned int x; | |
1155 | int error; | |
1156 | ||
1157 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1158 | error = gfs2_glock_nq_atime(&i_gh); | |
1159 | if (error) { | |
1160 | gfs2_holder_uninit(&i_gh); | |
1161 | return error; | |
1162 | } | |
1163 | ||
1164 | if (!ip->i_di.di_size) { | |
1165 | gfs2_consist_inode(ip); | |
1166 | error = -EIO; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1171 | if (error) | |
1172 | goto out; | |
1173 | ||
1174 | x = ip->i_di.di_size + 1; | |
1175 | if (x > *len) { | |
1176 | *buf = kmalloc(x, GFP_KERNEL); | |
1177 | if (!*buf) { | |
1178 | error = -ENOMEM; | |
1179 | goto out_brelse; | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1184 | *len = x; | |
1185 | ||
feaa7bba | 1186 | out_brelse: |
b3b94faa | 1187 | brelse(dibh); |
feaa7bba | 1188 | out: |
b3b94faa | 1189 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1190 | return error; |
1191 | } | |
1192 | ||
1193 | /** | |
1194 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1195 | * conditionally update the inode's atime | |
1196 | * @gh: the holder to acquire | |
1197 | * | |
1198 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1199 | * Update if the difference between the current time and the inode's current | |
1200 | * atime is greater than an interval specified at mount. | |
1201 | * | |
1202 | * Returns: errno | |
1203 | */ | |
1204 | ||
1205 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1206 | { | |
1207 | struct gfs2_glock *gl = gh->gh_gl; | |
1208 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1209 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1210 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1211 | unsigned int state; |
1212 | int flags; | |
1213 | int error; | |
1214 | ||
1215 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1216 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1217 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1218 | return -EINVAL; | |
1219 | ||
1220 | state = gh->gh_state; | |
1221 | flags = gh->gh_flags; | |
1222 | ||
1223 | error = gfs2_glock_nq(gh); | |
1224 | if (error) | |
1225 | return error; | |
1226 | ||
1227 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1228 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1229 | return 0; | |
1230 | ||
1231 | curtime = get_seconds(); | |
1232 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1233 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1234 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1235 | gh); | |
b3b94faa DT |
1236 | error = gfs2_glock_nq(gh); |
1237 | if (error) | |
1238 | return error; | |
1239 | ||
1240 | /* Verify that atime hasn't been updated while we were | |
1241 | trying to get exclusive lock. */ | |
1242 | ||
1243 | curtime = get_seconds(); | |
1244 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1245 | struct buffer_head *dibh; | |
48516ced | 1246 | struct gfs2_dinode *di; |
b3b94faa DT |
1247 | |
1248 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1249 | if (error == -EROFS) | |
1250 | return 0; | |
1251 | if (error) | |
1252 | goto fail; | |
1253 | ||
1254 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1255 | if (error) | |
1256 | goto fail_end_trans; | |
1257 | ||
1258 | ip->i_di.di_atime = curtime; | |
1259 | ||
d4e9c4c3 | 1260 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced SW |
1261 | di = (struct gfs2_dinode *)dibh->b_data; |
1262 | di->di_atime = cpu_to_be64(ip->i_di.di_atime); | |
b3b94faa DT |
1263 | brelse(dibh); |
1264 | ||
1265 | gfs2_trans_end(sdp); | |
1266 | } | |
1267 | ||
1268 | /* If someone else has asked for the glock, | |
1269 | unlock and let them have it. Then reacquire | |
1270 | in the original state. */ | |
1271 | if (gfs2_glock_is_blocking(gl)) { | |
1272 | gfs2_glock_dq(gh); | |
1273 | gfs2_holder_reinit(state, flags, gh); | |
1274 | return gfs2_glock_nq(gh); | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | return 0; | |
1279 | ||
feaa7bba | 1280 | fail_end_trans: |
b3b94faa | 1281 | gfs2_trans_end(sdp); |
feaa7bba | 1282 | fail: |
b3b94faa | 1283 | gfs2_glock_dq(gh); |
b3b94faa DT |
1284 | return error; |
1285 | } | |
1286 | ||
1287 | /** | |
1288 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1289 | * @arg_a: the first structure | |
1290 | * @arg_b: the second structure | |
1291 | * | |
1292 | * Returns: 1 if A > B | |
1293 | * -1 if A < B | |
75d3b817 | 1294 | * 0 if A == B |
b3b94faa DT |
1295 | */ |
1296 | ||
1297 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1298 | { | |
75d3b817 SW |
1299 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1300 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1301 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1302 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1303 | |
1304 | if (a->ln_number > b->ln_number) | |
75d3b817 SW |
1305 | return 1; |
1306 | if (a->ln_number < b->ln_number) | |
1307 | return -1; | |
1308 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1309 | return 1; | |
1310 | if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) | |
1311 | return 1; | |
b3b94faa | 1312 | |
75d3b817 | 1313 | return 0; |
b3b94faa DT |
1314 | } |
1315 | ||
1316 | /** | |
1317 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1318 | * atime update | |
1319 | * @num_gh: the number of structures | |
1320 | * @ghs: an array of struct gfs2_holder structures | |
1321 | * | |
1322 | * Returns: 0 on success (all glocks acquired), | |
1323 | * errno on failure (no glocks acquired) | |
1324 | */ | |
1325 | ||
1326 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1327 | { | |
1328 | struct gfs2_holder **p; | |
1329 | unsigned int x; | |
1330 | int error = 0; | |
1331 | ||
1332 | if (!num_gh) | |
1333 | return 0; | |
1334 | ||
1335 | if (num_gh == 1) { | |
1336 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1337 | if (ghs->gh_flags & GL_ATIME) | |
1338 | error = gfs2_glock_nq_atime(ghs); | |
1339 | else | |
1340 | error = gfs2_glock_nq(ghs); | |
1341 | return error; | |
1342 | } | |
1343 | ||
1344 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1345 | if (!p) | |
1346 | return -ENOMEM; | |
1347 | ||
1348 | for (x = 0; x < num_gh; x++) | |
1349 | p[x] = &ghs[x]; | |
1350 | ||
1351 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1352 | ||
1353 | for (x = 0; x < num_gh; x++) { | |
1354 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1355 | ||
1356 | if (p[x]->gh_flags & GL_ATIME) | |
1357 | error = gfs2_glock_nq_atime(p[x]); | |
1358 | else | |
1359 | error = gfs2_glock_nq(p[x]); | |
1360 | ||
1361 | if (error) { | |
1362 | while (x--) | |
1363 | gfs2_glock_dq(p[x]); | |
1364 | break; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | kfree(p); | |
b3b94faa DT |
1369 | return error; |
1370 | } | |
1371 | ||
b3b94faa DT |
1372 | |
1373 | static int | |
1374 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1375 | { | |
1376 | struct buffer_head *dibh; | |
1377 | int error; | |
1378 | ||
1379 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1380 | if (!error) { | |
feaa7bba SW |
1381 | error = inode_setattr(&ip->i_inode, attr); |
1382 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1383 | gfs2_inode_attr_out(ip); |
1384 | ||
d4e9c4c3 | 1385 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1386 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1387 | brelse(dibh); |
1388 | } | |
1389 | return error; | |
1390 | } | |
1391 | ||
1392 | /** | |
1393 | * gfs2_setattr_simple - | |
1394 | * @ip: | |
1395 | * @attr: | |
1396 | * | |
1397 | * Called with a reference on the vnode. | |
1398 | * | |
1399 | * Returns: errno | |
1400 | */ | |
1401 | ||
1402 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1403 | { | |
1404 | int error; | |
1405 | ||
5c676f6d | 1406 | if (current->journal_info) |
b3b94faa DT |
1407 | return __gfs2_setattr_simple(ip, attr); |
1408 | ||
feaa7bba | 1409 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1410 | if (error) |
1411 | return error; | |
1412 | ||
1413 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1414 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1415 | return error; |
1416 | } | |
1417 |