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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; | |
c2668711 SW |
54 | inode->i_mode = di->di_mode; |
55 | inode->i_nlink = di->di_nlink; | |
56 | inode->i_uid = di->di_uid; | |
57 | inode->i_gid = di->di_gid; | |
58 | i_size_write(inode, di->di_size); | |
59 | inode->i_atime.tv_sec = di->di_atime; | |
60 | inode->i_mtime.tv_sec = di->di_mtime; | |
61 | inode->i_ctime.tv_sec = di->di_ctime; | |
b3b94faa DT |
62 | inode->i_atime.tv_nsec = 0; |
63 | inode->i_mtime.tv_nsec = 0; | |
64 | inode->i_ctime.tv_nsec = 0; | |
c2668711 | 65 | inode->i_blocks = di->di_blocks << |
feaa7bba | 66 | (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
b3b94faa | 67 | |
c2668711 | 68 | if (di->di_flags & GFS2_DIF_IMMUTABLE) |
b3b94faa DT |
69 | inode->i_flags |= S_IMMUTABLE; |
70 | else | |
71 | inode->i_flags &= ~S_IMMUTABLE; | |
72 | ||
c2668711 | 73 | if (di->di_flags & GFS2_DIF_APPENDONLY) |
b3b94faa DT |
74 | inode->i_flags |= S_APPEND; |
75 | else | |
76 | inode->i_flags &= ~S_APPEND; | |
77 | } | |
78 | ||
b3b94faa DT |
79 | /** |
80 | * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode | |
81 | * @ip: The GFS2 inode | |
82 | * | |
83 | * Only copy out the attributes that we want the VFS layer | |
84 | * to be able to modify. | |
85 | */ | |
86 | ||
87 | void gfs2_inode_attr_out(struct gfs2_inode *ip) | |
88 | { | |
feaa7bba | 89 | struct inode *inode = &ip->i_inode; |
3ca68df6 | 90 | struct gfs2_dinode_host *di = &ip->i_di; |
feaa7bba | 91 | gfs2_assert_withdraw(GFS2_SB(inode), |
75d3b817 SW |
92 | (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); |
93 | di->di_mode = inode->i_mode; | |
94 | di->di_uid = inode->i_uid; | |
95 | di->di_gid = inode->i_gid; | |
96 | di->di_atime = inode->i_atime.tv_sec; | |
97 | di->di_mtime = inode->i_mtime.tv_sec; | |
98 | di->di_ctime = inode->i_ctime.tv_sec; | |
b3b94faa DT |
99 | } |
100 | ||
feaa7bba SW |
101 | static int iget_test(struct inode *inode, void *opaque) |
102 | { | |
103 | struct gfs2_inode *ip = GFS2_I(inode); | |
629a21e7 | 104 | struct gfs2_inum_host *inum = opaque; |
feaa7bba SW |
105 | |
106 | if (ip && ip->i_num.no_addr == inum->no_addr) | |
107 | return 1; | |
b3b94faa | 108 | |
feaa7bba SW |
109 | return 0; |
110 | } | |
111 | ||
112 | static int iget_set(struct inode *inode, void *opaque) | |
b3b94faa | 113 | { |
feaa7bba | 114 | struct gfs2_inode *ip = GFS2_I(inode); |
629a21e7 | 115 | struct gfs2_inum_host *inum = opaque; |
b3b94faa | 116 | |
feaa7bba SW |
117 | ip->i_num = *inum; |
118 | return 0; | |
119 | } | |
b3b94faa | 120 | |
629a21e7 | 121 | struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
122 | { |
123 | return ilookup5(sb, (unsigned long)inum->no_formal_ino, | |
124 | iget_test, inum); | |
125 | } | |
b3b94faa | 126 | |
629a21e7 | 127 | static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
feaa7bba SW |
128 | { |
129 | return iget5_locked(sb, (unsigned long)inum->no_formal_ino, | |
130 | iget_test, iget_set, inum); | |
b3b94faa DT |
131 | } |
132 | ||
133 | /** | |
feaa7bba SW |
134 | * gfs2_inode_lookup - Lookup an inode |
135 | * @sb: The super block | |
136 | * @inum: The inode number | |
137 | * @type: The type of the inode | |
b3b94faa | 138 | * |
feaa7bba | 139 | * Returns: A VFS inode, or an error |
b3b94faa DT |
140 | */ |
141 | ||
629a21e7 | 142 | struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
b3b94faa | 143 | { |
feaa7bba SW |
144 | struct inode *inode = gfs2_iget(sb, inum); |
145 | struct gfs2_inode *ip = GFS2_I(inode); | |
146 | struct gfs2_glock *io_gl; | |
147 | int error; | |
b3b94faa | 148 | |
26d83ded SW |
149 | if (!inode) |
150 | return ERR_PTR(-ENOBUFS); | |
151 | ||
feaa7bba SW |
152 | if (inode->i_state & I_NEW) { |
153 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
154 | umode_t mode = DT2IF(type); | |
bba9dfd8 | 155 | inode->i_private = ip; |
feaa7bba SW |
156 | inode->i_mode = mode; |
157 | ||
158 | if (S_ISREG(mode)) { | |
159 | inode->i_op = &gfs2_file_iops; | |
160 | inode->i_fop = &gfs2_file_fops; | |
161 | inode->i_mapping->a_ops = &gfs2_file_aops; | |
162 | } else if (S_ISDIR(mode)) { | |
163 | inode->i_op = &gfs2_dir_iops; | |
164 | inode->i_fop = &gfs2_dir_fops; | |
165 | } else if (S_ISLNK(mode)) { | |
166 | inode->i_op = &gfs2_symlink_iops; | |
167 | } else { | |
168 | inode->i_op = &gfs2_dev_iops; | |
b3b94faa | 169 | } |
b3b94faa | 170 | |
feaa7bba SW |
171 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
172 | if (unlikely(error)) | |
173 | goto fail; | |
174 | ip->i_gl->gl_object = ip; | |
b3b94faa | 175 | |
feaa7bba SW |
176 | error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
177 | if (unlikely(error)) | |
178 | goto fail_put; | |
b3b94faa | 179 | |
feaa7bba SW |
180 | ip->i_vn = ip->i_gl->gl_vn - 1; |
181 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
182 | if (unlikely(error)) | |
183 | goto fail_iopen; | |
b3b94faa | 184 | |
feaa7bba SW |
185 | gfs2_glock_put(io_gl); |
186 | unlock_new_inode(inode); | |
187 | } | |
b3b94faa DT |
188 | |
189 | return inode; | |
feaa7bba SW |
190 | fail_iopen: |
191 | gfs2_glock_put(io_gl); | |
192 | fail_put: | |
193 | ip->i_gl->gl_object = NULL; | |
194 | gfs2_glock_put(ip->i_gl); | |
195 | fail: | |
196 | iput(inode); | |
197 | return ERR_PTR(error); | |
b3b94faa DT |
198 | } |
199 | ||
af339c02 | 200 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
ea744d01 SW |
201 | { |
202 | struct gfs2_dinode_host *di = &ip->i_di; | |
203 | const struct gfs2_dinode *str = buf; | |
204 | ||
af339c02 SW |
205 | if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { |
206 | if (gfs2_consist_inode(ip)) | |
207 | gfs2_dinode_print(ip); | |
208 | return -EIO; | |
209 | } | |
210 | if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) | |
211 | return -ESTALE; | |
ea744d01 SW |
212 | |
213 | di->di_mode = be32_to_cpu(str->di_mode); | |
e7f14f4d SW |
214 | ip->i_inode.i_rdev = 0; |
215 | switch (di->di_mode & S_IFMT) { | |
216 | case S_IFBLK: | |
217 | case S_IFCHR: | |
218 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), | |
219 | be32_to_cpu(str->di_minor)); | |
220 | break; | |
221 | }; | |
222 | ||
ea744d01 SW |
223 | di->di_uid = be32_to_cpu(str->di_uid); |
224 | di->di_gid = be32_to_cpu(str->di_gid); | |
225 | di->di_nlink = be32_to_cpu(str->di_nlink); | |
226 | di->di_size = be64_to_cpu(str->di_size); | |
227 | di->di_blocks = be64_to_cpu(str->di_blocks); | |
228 | di->di_atime = be64_to_cpu(str->di_atime); | |
229 | di->di_mtime = be64_to_cpu(str->di_mtime); | |
230 | di->di_ctime = be64_to_cpu(str->di_ctime); | |
ea744d01 SW |
231 | |
232 | di->di_goal_meta = be64_to_cpu(str->di_goal_meta); | |
233 | di->di_goal_data = be64_to_cpu(str->di_goal_data); | |
234 | di->di_generation = be64_to_cpu(str->di_generation); | |
235 | ||
236 | di->di_flags = be32_to_cpu(str->di_flags); | |
237 | di->di_payload_format = be32_to_cpu(str->di_payload_format); | |
238 | di->di_height = be16_to_cpu(str->di_height); | |
239 | ||
240 | di->di_depth = be16_to_cpu(str->di_depth); | |
241 | di->di_entries = be32_to_cpu(str->di_entries); | |
242 | ||
243 | di->di_eattr = be64_to_cpu(str->di_eattr); | |
af339c02 | 244 | return 0; |
ea744d01 SW |
245 | } |
246 | ||
b3b94faa DT |
247 | /** |
248 | * gfs2_inode_refresh - Refresh the incore copy of the dinode | |
249 | * @ip: The GFS2 inode | |
250 | * | |
251 | * Returns: errno | |
252 | */ | |
253 | ||
254 | int gfs2_inode_refresh(struct gfs2_inode *ip) | |
255 | { | |
256 | struct buffer_head *dibh; | |
257 | int error; | |
258 | ||
259 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
260 | if (error) | |
261 | return error; | |
262 | ||
feaa7bba | 263 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
b3b94faa DT |
264 | brelse(dibh); |
265 | return -EIO; | |
266 | } | |
267 | ||
af339c02 | 268 | error = gfs2_dinode_in(ip, dibh->b_data); |
b3b94faa | 269 | brelse(dibh); |
b3b94faa DT |
270 | ip->i_vn = ip->i_gl->gl_vn; |
271 | ||
af339c02 | 272 | return error; |
b3b94faa DT |
273 | } |
274 | ||
feaa7bba | 275 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
b3b94faa | 276 | { |
feaa7bba | 277 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
278 | struct gfs2_alloc *al; |
279 | struct gfs2_rgrpd *rgd; | |
280 | int error; | |
281 | ||
282 | if (ip->i_di.di_blocks != 1) { | |
283 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 284 | gfs2_dinode_print(ip); |
b3b94faa DT |
285 | return -EIO; |
286 | } | |
287 | ||
288 | al = gfs2_alloc_get(ip); | |
289 | ||
290 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
291 | if (error) | |
292 | goto out; | |
293 | ||
294 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); | |
295 | if (error) | |
296 | goto out_qs; | |
297 | ||
298 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
299 | if (!rgd) { | |
300 | gfs2_consist_inode(ip); | |
301 | error = -EIO; | |
302 | goto out_rindex_relse; | |
303 | } | |
304 | ||
305 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, | |
306 | &al->al_rgd_gh); | |
307 | if (error) | |
308 | goto out_rindex_relse; | |
309 | ||
420b9e5e | 310 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
b3b94faa DT |
311 | if (error) |
312 | goto out_rg_gunlock; | |
313 | ||
314 | gfs2_trans_add_gl(ip->i_gl); | |
315 | ||
316 | gfs2_free_di(rgd, ip); | |
317 | ||
b3b94faa DT |
318 | gfs2_trans_end(sdp); |
319 | clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); | |
320 | ||
feaa7bba | 321 | out_rg_gunlock: |
b3b94faa | 322 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
feaa7bba | 323 | out_rindex_relse: |
b3b94faa | 324 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
feaa7bba | 325 | out_qs: |
b3b94faa | 326 | gfs2_quota_unhold(ip); |
36327521 | 327 | out: |
feaa7bba | 328 | gfs2_alloc_put(ip); |
b3b94faa DT |
329 | return error; |
330 | } | |
331 | ||
b3b94faa DT |
332 | /** |
333 | * gfs2_change_nlink - Change nlink count on inode | |
334 | * @ip: The GFS2 inode | |
335 | * @diff: The change in the nlink count required | |
336 | * | |
337 | * Returns: errno | |
338 | */ | |
339 | ||
340 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) | |
341 | { | |
feaa7bba | 342 | struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
b3b94faa | 343 | struct buffer_head *dibh; |
cd915493 | 344 | u32 nlink; |
b3b94faa DT |
345 | int error; |
346 | ||
29937ac6 | 347 | BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); |
b3b94faa DT |
348 | nlink = ip->i_di.di_nlink + diff; |
349 | ||
350 | /* If we are reducing the nlink count, but the new value ends up being | |
351 | bigger than the old one, we must have underflowed. */ | |
352 | if (diff < 0 && nlink > ip->i_di.di_nlink) { | |
353 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 354 | gfs2_dinode_print(ip); |
b3b94faa DT |
355 | return -EIO; |
356 | } | |
357 | ||
358 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
359 | if (error) | |
360 | return error; | |
361 | ||
362 | ip->i_di.di_nlink = nlink; | |
363 | ip->i_di.di_ctime = get_seconds(); | |
29937ac6 | 364 | ip->i_inode.i_nlink = nlink; |
b3b94faa | 365 | |
d4e9c4c3 | 366 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 367 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 368 | brelse(dibh); |
feaa7bba | 369 | mark_inode_dirty(&ip->i_inode); |
b3b94faa | 370 | |
feaa7bba SW |
371 | if (ip->i_di.di_nlink == 0) { |
372 | struct gfs2_rgrpd *rgd; | |
373 | struct gfs2_holder ri_gh, rg_gh; | |
374 | ||
375 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
376 | if (error) | |
377 | goto out; | |
378 | error = -EIO; | |
379 | rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); | |
380 | if (!rgd) | |
381 | goto out_norgrp; | |
382 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); | |
383 | if (error) | |
384 | goto out_norgrp; | |
385 | ||
f92a0b6f | 386 | clear_nlink(&ip->i_inode); |
feaa7bba SW |
387 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
388 | gfs2_glock_dq_uninit(&rg_gh); | |
389 | out_norgrp: | |
390 | gfs2_glock_dq_uninit(&ri_gh); | |
391 | } | |
392 | out: | |
393 | return error; | |
b3b94faa DT |
394 | } |
395 | ||
c752666c SW |
396 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
397 | { | |
398 | struct qstr qstr; | |
71b86f56 | 399 | gfs2_str2qstr(&qstr, name); |
c752666c SW |
400 | return gfs2_lookupi(dip, &qstr, 1, NULL); |
401 | } | |
402 | ||
403 | ||
b3b94faa DT |
404 | /** |
405 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
406 | * @d_gh: An initialized holder for the directory glock | |
407 | * @name: The name of the inode to look for | |
408 | * @is_root: If 1, ignore the caller's permissions | |
409 | * @i_gh: An uninitialized holder for the new inode glock | |
410 | * | |
411 | * There will always be a vnode (Linux VFS inode) for the d_gh inode unless | |
412 | * @is_root is true. | |
413 | * | |
414 | * Returns: errno | |
415 | */ | |
416 | ||
feaa7bba SW |
417 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
418 | int is_root, struct nameidata *nd) | |
b3b94faa | 419 | { |
c9fd4307 | 420 | struct super_block *sb = dir->i_sb; |
feaa7bba | 421 | struct gfs2_inode *dip = GFS2_I(dir); |
b3b94faa | 422 | struct gfs2_holder d_gh; |
629a21e7 | 423 | struct gfs2_inum_host inum; |
b3b94faa | 424 | unsigned int type; |
7359a19c | 425 | int error = 0; |
c752666c | 426 | struct inode *inode = NULL; |
b3b94faa DT |
427 | |
428 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
c752666c | 429 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 430 | |
c752666c SW |
431 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
432 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
433 | dir == sb->s_root->d_inode)) { | |
320dd101 SW |
434 | igrab(dir); |
435 | return dir; | |
b3b94faa DT |
436 | } |
437 | ||
438 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
439 | if (error) | |
c752666c | 440 | return ERR_PTR(error); |
b3b94faa DT |
441 | |
442 | if (!is_root) { | |
faf450ef | 443 | error = permission(dir, MAY_EXEC, NULL); |
b3b94faa DT |
444 | if (error) |
445 | goto out; | |
446 | } | |
447 | ||
c752666c | 448 | error = gfs2_dir_search(dir, name, &inum, &type); |
b3b94faa DT |
449 | if (error) |
450 | goto out; | |
451 | ||
feaa7bba | 452 | inode = gfs2_inode_lookup(sb, &inum, type); |
b3b94faa | 453 | |
7359a19c | 454 | out: |
b3b94faa | 455 | gfs2_glock_dq_uninit(&d_gh); |
c752666c SW |
456 | if (error == -ENOENT) |
457 | return NULL; | |
feaa7bba | 458 | return inode; |
b3b94faa DT |
459 | } |
460 | ||
cd915493 | 461 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 462 | { |
feaa7bba | 463 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
b3b94faa | 464 | struct buffer_head *bh; |
e6972647 | 465 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
466 | int error; |
467 | ||
468 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
469 | if (error) | |
470 | return error; | |
f55ab26a | 471 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
472 | |
473 | error = gfs2_meta_inode_buffer(ip, &bh); | |
474 | if (error) { | |
f55ab26a | 475 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
476 | gfs2_trans_end(sdp); |
477 | return error; | |
478 | } | |
479 | ||
480 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); | |
481 | ||
482 | if (ir.ir_length) { | |
483 | *formal_ino = ir.ir_start++; | |
484 | ir.ir_length--; | |
d4e9c4c3 | 485 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
486 | gfs2_inum_range_out(&ir, |
487 | bh->b_data + sizeof(struct gfs2_dinode)); | |
488 | brelse(bh); | |
f55ab26a | 489 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
490 | gfs2_trans_end(sdp); |
491 | return 0; | |
492 | } | |
493 | ||
494 | brelse(bh); | |
495 | ||
f55ab26a | 496 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa DT |
497 | gfs2_trans_end(sdp); |
498 | ||
499 | return 1; | |
500 | } | |
501 | ||
cd915493 | 502 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
b3b94faa | 503 | { |
feaa7bba SW |
504 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
505 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); | |
b3b94faa DT |
506 | struct gfs2_holder gh; |
507 | struct buffer_head *bh; | |
e6972647 | 508 | struct gfs2_inum_range_host ir; |
b3b94faa DT |
509 | int error; |
510 | ||
511 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); | |
512 | if (error) | |
513 | return error; | |
514 | ||
515 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
516 | if (error) | |
517 | goto out; | |
f55ab26a | 518 | mutex_lock(&sdp->sd_inum_mutex); |
b3b94faa DT |
519 | |
520 | error = gfs2_meta_inode_buffer(ip, &bh); | |
521 | if (error) | |
522 | goto out_end_trans; | |
907b9bce | 523 | |
b3b94faa DT |
524 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
525 | ||
526 | if (!ir.ir_length) { | |
527 | struct buffer_head *m_bh; | |
cd915493 | 528 | u64 x, y; |
b44b84d7 | 529 | __be64 z; |
b3b94faa DT |
530 | |
531 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
532 | if (error) | |
533 | goto out_brelse; | |
534 | ||
b44b84d7 AV |
535 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
536 | x = y = be64_to_cpu(z); | |
b3b94faa DT |
537 | ir.ir_start = x; |
538 | ir.ir_length = GFS2_INUM_QUANTUM; | |
539 | x += GFS2_INUM_QUANTUM; | |
540 | if (x < y) | |
541 | gfs2_consist_inode(m_ip); | |
b44b84d7 | 542 | z = cpu_to_be64(x); |
d4e9c4c3 | 543 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b44b84d7 | 544 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
b3b94faa DT |
545 | |
546 | brelse(m_bh); | |
547 | } | |
548 | ||
549 | *formal_ino = ir.ir_start++; | |
550 | ir.ir_length--; | |
551 | ||
d4e9c4c3 | 552 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
553 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
554 | ||
420b9e5e | 555 | out_brelse: |
b3b94faa | 556 | brelse(bh); |
420b9e5e | 557 | out_end_trans: |
f55ab26a | 558 | mutex_unlock(&sdp->sd_inum_mutex); |
b3b94faa | 559 | gfs2_trans_end(sdp); |
420b9e5e | 560 | out: |
b3b94faa | 561 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
562 | return error; |
563 | } | |
564 | ||
cd915493 | 565 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
b3b94faa DT |
566 | { |
567 | int error; | |
568 | ||
569 | error = pick_formal_ino_1(sdp, inum); | |
570 | if (error <= 0) | |
571 | return error; | |
572 | ||
573 | error = pick_formal_ino_2(sdp, inum); | |
574 | ||
575 | return error; | |
576 | } | |
577 | ||
578 | /** | |
579 | * create_ok - OK to create a new on-disk inode here? | |
580 | * @dip: Directory in which dinode is to be created | |
581 | * @name: Name of new dinode | |
582 | * @mode: | |
583 | * | |
584 | * Returns: errno | |
585 | */ | |
586 | ||
feaa7bba | 587 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
588 | unsigned int mode) |
589 | { | |
590 | int error; | |
591 | ||
faf450ef | 592 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
593 | if (error) |
594 | return error; | |
595 | ||
596 | /* Don't create entries in an unlinked directory */ | |
597 | if (!dip->i_di.di_nlink) | |
598 | return -EPERM; | |
599 | ||
feaa7bba | 600 | error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
b3b94faa DT |
601 | switch (error) { |
602 | case -ENOENT: | |
603 | error = 0; | |
604 | break; | |
605 | case 0: | |
606 | return -EEXIST; | |
607 | default: | |
608 | return error; | |
609 | } | |
610 | ||
cd915493 | 611 | if (dip->i_di.di_entries == (u32)-1) |
b3b94faa | 612 | return -EFBIG; |
cd915493 | 613 | if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1) |
b3b94faa DT |
614 | return -EMLINK; |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, | |
620 | unsigned int *uid, unsigned int *gid) | |
621 | { | |
feaa7bba | 622 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
420b9e5e | 623 | (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) { |
b3b94faa DT |
624 | if (S_ISDIR(*mode)) |
625 | *mode |= S_ISUID; | |
626 | else if (dip->i_di.di_uid != current->fsuid) | |
627 | *mode &= ~07111; | |
628 | *uid = dip->i_di.di_uid; | |
629 | } else | |
630 | *uid = current->fsuid; | |
631 | ||
632 | if (dip->i_di.di_mode & S_ISGID) { | |
633 | if (S_ISDIR(*mode)) | |
634 | *mode |= S_ISGID; | |
635 | *gid = dip->i_di.di_gid; | |
636 | } else | |
637 | *gid = current->fsgid; | |
638 | } | |
639 | ||
629a21e7 | 640 | static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
4340fe62 | 641 | u64 *generation) |
b3b94faa | 642 | { |
feaa7bba | 643 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
644 | int error; |
645 | ||
646 | gfs2_alloc_get(dip); | |
647 | ||
648 | dip->i_alloc.al_requested = RES_DINODE; | |
649 | error = gfs2_inplace_reserve(dip); | |
650 | if (error) | |
651 | goto out; | |
652 | ||
feaa7bba | 653 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
b3b94faa DT |
654 | if (error) |
655 | goto out_ipreserv; | |
656 | ||
4340fe62 | 657 | inum->no_addr = gfs2_alloc_di(dip, generation); |
b3b94faa DT |
658 | |
659 | gfs2_trans_end(sdp); | |
660 | ||
4340fe62 | 661 | out_ipreserv: |
b3b94faa | 662 | gfs2_inplace_release(dip); |
4340fe62 | 663 | out: |
b3b94faa | 664 | gfs2_alloc_put(dip); |
b3b94faa DT |
665 | return error; |
666 | } | |
667 | ||
668 | /** | |
669 | * init_dinode - Fill in a new dinode structure | |
670 | * @dip: the directory this inode is being created in | |
671 | * @gl: The glock covering the new inode | |
672 | * @inum: the inode number | |
673 | * @mode: the file permissions | |
674 | * @uid: | |
675 | * @gid: | |
676 | * | |
677 | */ | |
678 | ||
679 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 680 | const struct gfs2_inum_host *inum, unsigned int mode, |
4340fe62 | 681 | unsigned int uid, unsigned int gid, |
e7f14f4d | 682 | const u64 *generation, dev_t dev) |
b3b94faa | 683 | { |
feaa7bba | 684 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b96ca4fa | 685 | struct gfs2_dinode *di; |
b3b94faa DT |
686 | struct buffer_head *dibh; |
687 | ||
688 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
d4e9c4c3 | 689 | gfs2_trans_add_bh(gl, dibh, 1); |
b3b94faa DT |
690 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
691 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
b96ca4fa SW |
692 | di = (struct gfs2_dinode *)dibh->b_data; |
693 | ||
2442a098 SW |
694 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
695 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
b96ca4fa SW |
696 | di->di_mode = cpu_to_be32(mode); |
697 | di->di_uid = cpu_to_be32(uid); | |
698 | di->di_gid = cpu_to_be32(gid); | |
699 | di->di_nlink = cpu_to_be32(0); | |
700 | di->di_size = cpu_to_be64(0); | |
701 | di->di_blocks = cpu_to_be64(1); | |
702 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); | |
e7f14f4d SW |
703 | di->di_major = cpu_to_be32(MAJOR(dev)); |
704 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
b96ca4fa | 705 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
4340fe62 | 706 | di->di_generation = cpu_to_be64(*generation); |
b96ca4fa | 707 | di->di_flags = cpu_to_be32(0); |
b3b94faa DT |
708 | |
709 | if (S_ISREG(mode)) { | |
710 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || | |
711 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
b96ca4fa | 712 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
b3b94faa DT |
713 | if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
714 | gfs2_tune_get(sdp, gt_new_files_directio)) | |
b96ca4fa | 715 | di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
b3b94faa | 716 | } else if (S_ISDIR(mode)) { |
568f4c96 SW |
717 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
718 | GFS2_DIF_INHERIT_DIRECTIO); | |
719 | di->di_flags |= cpu_to_be32(dip->i_di.di_flags & | |
720 | GFS2_DIF_INHERIT_JDATA); | |
b3b94faa DT |
721 | } |
722 | ||
b96ca4fa | 723 | di->__pad1 = 0; |
b2a580d8 | 724 | di->di_payload_format = cpu_to_be32(0); |
b96ca4fa SW |
725 | di->di_height = cpu_to_be32(0); |
726 | di->__pad2 = 0; | |
727 | di->__pad3 = 0; | |
728 | di->di_depth = cpu_to_be16(0); | |
729 | di->di_entries = cpu_to_be32(0); | |
730 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
731 | di->di_eattr = cpu_to_be64(0); | |
732 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
733 | ||
b3b94faa DT |
734 | brelse(dibh); |
735 | } | |
736 | ||
737 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
629a21e7 | 738 | unsigned int mode, const struct gfs2_inum_host *inum, |
e7f14f4d | 739 | const u64 *generation, dev_t dev) |
b3b94faa | 740 | { |
feaa7bba | 741 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
742 | unsigned int uid, gid; |
743 | int error; | |
744 | ||
745 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
b3b94faa DT |
746 | gfs2_alloc_get(dip); |
747 | ||
748 | error = gfs2_quota_lock(dip, uid, gid); | |
749 | if (error) | |
750 | goto out; | |
751 | ||
752 | error = gfs2_quota_check(dip, uid, gid); | |
753 | if (error) | |
754 | goto out_quota; | |
755 | ||
feaa7bba | 756 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
b3b94faa DT |
757 | if (error) |
758 | goto out_quota; | |
759 | ||
e7f14f4d | 760 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); |
b3b94faa | 761 | gfs2_quota_change(dip, +1, uid, gid); |
b3b94faa DT |
762 | gfs2_trans_end(sdp); |
763 | ||
feaa7bba | 764 | out_quota: |
b3b94faa | 765 | gfs2_quota_unlock(dip); |
feaa7bba | 766 | out: |
b3b94faa | 767 | gfs2_alloc_put(dip); |
b3b94faa DT |
768 | return error; |
769 | } | |
770 | ||
feaa7bba SW |
771 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
772 | struct gfs2_inode *ip) | |
b3b94faa | 773 | { |
feaa7bba | 774 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
b3b94faa DT |
775 | struct gfs2_alloc *al; |
776 | int alloc_required; | |
777 | struct buffer_head *dibh; | |
778 | int error; | |
779 | ||
780 | al = gfs2_alloc_get(dip); | |
781 | ||
782 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
783 | if (error) | |
784 | goto fail; | |
785 | ||
feaa7bba | 786 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
c752666c SW |
787 | if (alloc_required < 0) |
788 | goto fail; | |
b3b94faa DT |
789 | if (alloc_required) { |
790 | error = gfs2_quota_check(dip, dip->i_di.di_uid, | |
791 | dip->i_di.di_gid); | |
792 | if (error) | |
793 | goto fail_quota_locks; | |
794 | ||
795 | al->al_requested = sdp->sd_max_dirres; | |
796 | ||
797 | error = gfs2_inplace_reserve(dip); | |
798 | if (error) | |
799 | goto fail_quota_locks; | |
800 | ||
320dd101 | 801 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
b3b94faa | 802 | al->al_rgd->rd_ri.ri_length + |
907b9bce | 803 | 2 * RES_DINODE + |
b3b94faa DT |
804 | RES_STATFS + RES_QUOTA, 0); |
805 | if (error) | |
806 | goto fail_ipreserv; | |
807 | } else { | |
feaa7bba | 808 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
b3b94faa DT |
809 | if (error) |
810 | goto fail_quota_locks; | |
811 | } | |
812 | ||
feaa7bba | 813 | error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); |
b3b94faa DT |
814 | if (error) |
815 | goto fail_end_trans; | |
816 | ||
817 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
818 | if (error) | |
819 | goto fail_end_trans; | |
820 | ip->i_di.di_nlink = 1; | |
d4e9c4c3 | 821 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 822 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa | 823 | brelse(dibh); |
b3b94faa DT |
824 | return 0; |
825 | ||
320dd101 | 826 | fail_end_trans: |
b3b94faa DT |
827 | gfs2_trans_end(sdp); |
828 | ||
320dd101 | 829 | fail_ipreserv: |
b3b94faa DT |
830 | if (dip->i_alloc.al_rgd) |
831 | gfs2_inplace_release(dip); | |
832 | ||
320dd101 | 833 | fail_quota_locks: |
b3b94faa DT |
834 | gfs2_quota_unlock(dip); |
835 | ||
320dd101 | 836 | fail: |
b3b94faa | 837 | gfs2_alloc_put(dip); |
b3b94faa DT |
838 | return error; |
839 | } | |
840 | ||
fcb47e0b RH |
841 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
842 | { | |
843 | int err; | |
844 | size_t len; | |
845 | void *value; | |
846 | char *name; | |
847 | struct gfs2_ea_request er; | |
848 | ||
849 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, | |
850 | &name, &value, &len); | |
851 | ||
852 | if (err) { | |
853 | if (err == -EOPNOTSUPP) | |
854 | return 0; | |
855 | return err; | |
856 | } | |
857 | ||
858 | memset(&er, 0, sizeof(struct gfs2_ea_request)); | |
859 | ||
860 | er.er_type = GFS2_EATYPE_SECURITY; | |
861 | er.er_name = name; | |
862 | er.er_data = value; | |
863 | er.er_name_len = strlen(name); | |
864 | er.er_data_len = len; | |
865 | ||
866 | err = gfs2_ea_set_i(ip, &er); | |
867 | ||
868 | kfree(value); | |
869 | kfree(name); | |
870 | ||
871 | return err; | |
872 | } | |
873 | ||
b3b94faa DT |
874 | /** |
875 | * gfs2_createi - Create a new inode | |
876 | * @ghs: An array of two holders | |
877 | * @name: The name of the new file | |
878 | * @mode: the permissions on the new inode | |
879 | * | |
880 | * @ghs[0] is an initialized holder for the directory | |
881 | * @ghs[1] is the holder for the inode lock | |
882 | * | |
7359a19c | 883 | * If the return value is not NULL, the glocks on both the directory and the new |
b3b94faa DT |
884 | * file are held. A transaction has been started and an inplace reservation |
885 | * is held, as well. | |
886 | * | |
7359a19c | 887 | * Returns: An inode |
b3b94faa DT |
888 | */ |
889 | ||
feaa7bba | 890 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
e7f14f4d | 891 | unsigned int mode, dev_t dev) |
b3b94faa | 892 | { |
7359a19c | 893 | struct inode *inode; |
5c676f6d | 894 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
feaa7bba SW |
895 | struct inode *dir = &dip->i_inode; |
896 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
629a21e7 | 897 | struct gfs2_inum_host inum; |
b3b94faa | 898 | int error; |
4340fe62 | 899 | u64 generation; |
b3b94faa DT |
900 | |
901 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
7359a19c | 902 | return ERR_PTR(-ENAMETOOLONG); |
b3b94faa | 903 | |
b3b94faa DT |
904 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
905 | error = gfs2_glock_nq(ghs); | |
906 | if (error) | |
907 | goto fail; | |
908 | ||
909 | error = create_ok(dip, name, mode); | |
910 | if (error) | |
911 | goto fail_gunlock; | |
912 | ||
feaa7bba | 913 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
b3b94faa DT |
914 | if (error) |
915 | goto fail_gunlock; | |
916 | ||
4340fe62 | 917 | error = alloc_dinode(dip, &inum, &generation); |
b3b94faa DT |
918 | if (error) |
919 | goto fail_gunlock; | |
920 | ||
feaa7bba | 921 | if (inum.no_addr < dip->i_num.no_addr) { |
b3b94faa DT |
922 | gfs2_glock_dq(ghs); |
923 | ||
feaa7bba | 924 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
925 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
926 | GL_SKIP, ghs + 1); | |
b3b94faa | 927 | if (error) { |
7359a19c | 928 | return ERR_PTR(error); |
b3b94faa DT |
929 | } |
930 | ||
931 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); | |
932 | error = gfs2_glock_nq(ghs); | |
933 | if (error) { | |
934 | gfs2_glock_dq_uninit(ghs + 1); | |
7359a19c | 935 | return ERR_PTR(error); |
b3b94faa DT |
936 | } |
937 | ||
938 | error = create_ok(dip, name, mode); | |
939 | if (error) | |
940 | goto fail_gunlock2; | |
941 | } else { | |
feaa7bba | 942 | error = gfs2_glock_nq_num(sdp, inum.no_addr, |
320dd101 SW |
943 | &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
944 | GL_SKIP, ghs + 1); | |
b3b94faa DT |
945 | if (error) |
946 | goto fail_gunlock; | |
947 | } | |
948 | ||
e7f14f4d | 949 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); |
b3b94faa DT |
950 | if (error) |
951 | goto fail_gunlock2; | |
952 | ||
feaa7bba SW |
953 | inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
954 | if (IS_ERR(inode)) | |
b3b94faa DT |
955 | goto fail_gunlock2; |
956 | ||
feaa7bba | 957 | error = gfs2_inode_refresh(GFS2_I(inode)); |
b3b94faa DT |
958 | if (error) |
959 | goto fail_iput; | |
960 | ||
feaa7bba | 961 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
b3b94faa DT |
962 | if (error) |
963 | goto fail_iput; | |
964 | ||
fcb47e0b RH |
965 | error = gfs2_security_init(dip, GFS2_I(inode)); |
966 | if (error) | |
967 | goto fail_iput; | |
968 | ||
feaa7bba | 969 | error = link_dinode(dip, name, GFS2_I(inode)); |
b3b94faa DT |
970 | if (error) |
971 | goto fail_iput; | |
972 | ||
7359a19c SW |
973 | if (!inode) |
974 | return ERR_PTR(-ENOMEM); | |
975 | return inode; | |
b3b94faa | 976 | |
320dd101 | 977 | fail_iput: |
feaa7bba | 978 | iput(inode); |
320dd101 | 979 | fail_gunlock2: |
b3b94faa | 980 | gfs2_glock_dq_uninit(ghs + 1); |
320dd101 | 981 | fail_gunlock: |
b3b94faa | 982 | gfs2_glock_dq(ghs); |
320dd101 | 983 | fail: |
7359a19c | 984 | return ERR_PTR(error); |
b3b94faa DT |
985 | } |
986 | ||
b3b94faa DT |
987 | /** |
988 | * gfs2_rmdiri - Remove a directory | |
989 | * @dip: The parent directory of the directory to be removed | |
990 | * @name: The name of the directory to be removed | |
991 | * @ip: The GFS2 inode of the directory to be removed | |
992 | * | |
993 | * Assumes Glocks on dip and ip are held | |
994 | * | |
995 | * Returns: errno | |
996 | */ | |
997 | ||
feaa7bba SW |
998 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
999 | struct gfs2_inode *ip) | |
b3b94faa | 1000 | { |
b3b94faa DT |
1001 | struct qstr dotname; |
1002 | int error; | |
1003 | ||
1004 | if (ip->i_di.di_entries != 2) { | |
1005 | if (gfs2_consist_inode(ip)) | |
4cc14f0b | 1006 | gfs2_dinode_print(ip); |
b3b94faa DT |
1007 | return -EIO; |
1008 | } | |
1009 | ||
1010 | error = gfs2_dir_del(dip, name); | |
1011 | if (error) | |
1012 | return error; | |
1013 | ||
1014 | error = gfs2_change_nlink(dip, -1); | |
1015 | if (error) | |
1016 | return error; | |
1017 | ||
71b86f56 | 1018 | gfs2_str2qstr(&dotname, "."); |
b3b94faa DT |
1019 | error = gfs2_dir_del(ip, &dotname); |
1020 | if (error) | |
1021 | return error; | |
1022 | ||
feaa7bba | 1023 | gfs2_str2qstr(&dotname, ".."); |
b3b94faa DT |
1024 | error = gfs2_dir_del(ip, &dotname); |
1025 | if (error) | |
1026 | return error; | |
1027 | ||
1028 | error = gfs2_change_nlink(ip, -2); | |
1029 | if (error) | |
1030 | return error; | |
1031 | ||
b3b94faa DT |
1032 | return error; |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1037 | * @dip: the directory | |
1038 | * @name: the name of the file | |
1039 | * @ip: the inode | |
1040 | * | |
1041 | * Assumes that the lock on (at least) @dip is held. | |
1042 | * | |
1043 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1044 | */ | |
1045 | ||
feaa7bba | 1046 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
b3b94faa DT |
1047 | struct gfs2_inode *ip) |
1048 | { | |
629a21e7 | 1049 | struct gfs2_inum_host inum; |
b3b94faa DT |
1050 | unsigned int type; |
1051 | int error; | |
1052 | ||
feaa7bba | 1053 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
b3b94faa DT |
1054 | return -EPERM; |
1055 | ||
1056 | if ((dip->i_di.di_mode & S_ISVTX) && | |
1057 | dip->i_di.di_uid != current->fsuid && | |
feaa7bba | 1058 | ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) |
b3b94faa DT |
1059 | return -EPERM; |
1060 | ||
feaa7bba | 1061 | if (IS_APPEND(&dip->i_inode)) |
b3b94faa DT |
1062 | return -EPERM; |
1063 | ||
faf450ef | 1064 | error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
b3b94faa DT |
1065 | if (error) |
1066 | return error; | |
1067 | ||
feaa7bba | 1068 | error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
b3b94faa DT |
1069 | if (error) |
1070 | return error; | |
1071 | ||
1072 | if (!gfs2_inum_equal(&inum, &ip->i_num)) | |
1073 | return -ENOENT; | |
1074 | ||
1075 | if (IF2DT(ip->i_di.di_mode) != type) { | |
1076 | gfs2_consist_inode(dip); | |
1077 | return -EIO; | |
1078 | } | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1085 | * @this: move this | |
1086 | * @to: to here | |
1087 | * | |
1088 | * Follow @to back to the root and make sure we don't encounter @this | |
1089 | * Assumes we already hold the rename lock. | |
1090 | * | |
1091 | * Returns: errno | |
1092 | */ | |
1093 | ||
1094 | int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1095 | { | |
feaa7bba | 1096 | struct inode *dir = &to->i_inode; |
c9fd4307 | 1097 | struct super_block *sb = dir->i_sb; |
7359a19c | 1098 | struct inode *tmp; |
b3b94faa DT |
1099 | struct qstr dotdot; |
1100 | int error = 0; | |
1101 | ||
71b86f56 | 1102 | gfs2_str2qstr(&dotdot, ".."); |
b3b94faa | 1103 | |
7359a19c | 1104 | igrab(dir); |
b3b94faa DT |
1105 | |
1106 | for (;;) { | |
feaa7bba | 1107 | if (dir == &this->i_inode) { |
b3b94faa DT |
1108 | error = -EINVAL; |
1109 | break; | |
1110 | } | |
c9fd4307 | 1111 | if (dir == sb->s_root->d_inode) { |
b3b94faa DT |
1112 | error = 0; |
1113 | break; | |
1114 | } | |
1115 | ||
c752666c SW |
1116 | tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); |
1117 | if (IS_ERR(tmp)) { | |
1118 | error = PTR_ERR(tmp); | |
b3b94faa | 1119 | break; |
c752666c | 1120 | } |
b3b94faa | 1121 | |
7359a19c SW |
1122 | iput(dir); |
1123 | dir = tmp; | |
b3b94faa DT |
1124 | } |
1125 | ||
7359a19c | 1126 | iput(dir); |
b3b94faa DT |
1127 | |
1128 | return error; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * gfs2_readlinki - return the contents of a symlink | |
1133 | * @ip: the symlink's inode | |
1134 | * @buf: a pointer to the buffer to be filled | |
1135 | * @len: a pointer to the length of @buf | |
1136 | * | |
1137 | * If @buf is too small, a piece of memory is kmalloc()ed and needs | |
1138 | * to be freed by the caller. | |
1139 | * | |
1140 | * Returns: errno | |
1141 | */ | |
1142 | ||
1143 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) | |
1144 | { | |
1145 | struct gfs2_holder i_gh; | |
1146 | struct buffer_head *dibh; | |
1147 | unsigned int x; | |
1148 | int error; | |
1149 | ||
1150 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); | |
1151 | error = gfs2_glock_nq_atime(&i_gh); | |
1152 | if (error) { | |
1153 | gfs2_holder_uninit(&i_gh); | |
1154 | return error; | |
1155 | } | |
1156 | ||
1157 | if (!ip->i_di.di_size) { | |
1158 | gfs2_consist_inode(ip); | |
1159 | error = -EIO; | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1164 | if (error) | |
1165 | goto out; | |
1166 | ||
1167 | x = ip->i_di.di_size + 1; | |
1168 | if (x > *len) { | |
1169 | *buf = kmalloc(x, GFP_KERNEL); | |
1170 | if (!*buf) { | |
1171 | error = -ENOMEM; | |
1172 | goto out_brelse; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); | |
1177 | *len = x; | |
1178 | ||
feaa7bba | 1179 | out_brelse: |
b3b94faa | 1180 | brelse(dibh); |
feaa7bba | 1181 | out: |
b3b94faa | 1182 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1183 | return error; |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and | |
1188 | * conditionally update the inode's atime | |
1189 | * @gh: the holder to acquire | |
1190 | * | |
1191 | * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap | |
1192 | * Update if the difference between the current time and the inode's current | |
1193 | * atime is greater than an interval specified at mount. | |
1194 | * | |
1195 | * Returns: errno | |
1196 | */ | |
1197 | ||
1198 | int gfs2_glock_nq_atime(struct gfs2_holder *gh) | |
1199 | { | |
1200 | struct gfs2_glock *gl = gh->gh_gl; | |
1201 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
5c676f6d | 1202 | struct gfs2_inode *ip = gl->gl_object; |
cd915493 | 1203 | s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
b3b94faa DT |
1204 | unsigned int state; |
1205 | int flags; | |
1206 | int error; | |
1207 | ||
1208 | if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || | |
1209 | gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || | |
1210 | gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) | |
1211 | return -EINVAL; | |
1212 | ||
1213 | state = gh->gh_state; | |
1214 | flags = gh->gh_flags; | |
1215 | ||
1216 | error = gfs2_glock_nq(gh); | |
1217 | if (error) | |
1218 | return error; | |
1219 | ||
1220 | if (test_bit(SDF_NOATIME, &sdp->sd_flags) || | |
1221 | (sdp->sd_vfs->s_flags & MS_RDONLY)) | |
1222 | return 0; | |
1223 | ||
1224 | curtime = get_seconds(); | |
1225 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1226 | gfs2_glock_dq(gh); | |
fd88de56 SW |
1227 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
1228 | gh); | |
b3b94faa DT |
1229 | error = gfs2_glock_nq(gh); |
1230 | if (error) | |
1231 | return error; | |
1232 | ||
1233 | /* Verify that atime hasn't been updated while we were | |
1234 | trying to get exclusive lock. */ | |
1235 | ||
1236 | curtime = get_seconds(); | |
1237 | if (curtime - ip->i_di.di_atime >= quantum) { | |
1238 | struct buffer_head *dibh; | |
48516ced | 1239 | struct gfs2_dinode *di; |
b3b94faa DT |
1240 | |
1241 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1242 | if (error == -EROFS) | |
1243 | return 0; | |
1244 | if (error) | |
1245 | goto fail; | |
1246 | ||
1247 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1248 | if (error) | |
1249 | goto fail_end_trans; | |
1250 | ||
1251 | ip->i_di.di_atime = curtime; | |
1252 | ||
d4e9c4c3 | 1253 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced SW |
1254 | di = (struct gfs2_dinode *)dibh->b_data; |
1255 | di->di_atime = cpu_to_be64(ip->i_di.di_atime); | |
b3b94faa DT |
1256 | brelse(dibh); |
1257 | ||
1258 | gfs2_trans_end(sdp); | |
1259 | } | |
1260 | ||
1261 | /* If someone else has asked for the glock, | |
1262 | unlock and let them have it. Then reacquire | |
1263 | in the original state. */ | |
1264 | if (gfs2_glock_is_blocking(gl)) { | |
1265 | gfs2_glock_dq(gh); | |
1266 | gfs2_holder_reinit(state, flags, gh); | |
1267 | return gfs2_glock_nq(gh); | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | return 0; | |
1272 | ||
feaa7bba | 1273 | fail_end_trans: |
b3b94faa | 1274 | gfs2_trans_end(sdp); |
feaa7bba | 1275 | fail: |
b3b94faa | 1276 | gfs2_glock_dq(gh); |
b3b94faa DT |
1277 | return error; |
1278 | } | |
1279 | ||
1280 | /** | |
1281 | * glock_compare_atime - Compare two struct gfs2_glock structures for sort | |
1282 | * @arg_a: the first structure | |
1283 | * @arg_b: the second structure | |
1284 | * | |
1285 | * Returns: 1 if A > B | |
1286 | * -1 if A < B | |
75d3b817 | 1287 | * 0 if A == B |
b3b94faa DT |
1288 | */ |
1289 | ||
1290 | static int glock_compare_atime(const void *arg_a, const void *arg_b) | |
1291 | { | |
75d3b817 SW |
1292 | const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
1293 | const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; | |
1294 | const struct lm_lockname *a = &gh_a->gh_gl->gl_name; | |
1295 | const struct lm_lockname *b = &gh_b->gh_gl->gl_name; | |
b3b94faa DT |
1296 | |
1297 | if (a->ln_number > b->ln_number) | |
75d3b817 SW |
1298 | return 1; |
1299 | if (a->ln_number < b->ln_number) | |
1300 | return -1; | |
1301 | if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) | |
1302 | return 1; | |
1303 | if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) | |
1304 | return 1; | |
b3b94faa | 1305 | |
75d3b817 | 1306 | return 0; |
b3b94faa DT |
1307 | } |
1308 | ||
1309 | /** | |
1310 | * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an | |
1311 | * atime update | |
1312 | * @num_gh: the number of structures | |
1313 | * @ghs: an array of struct gfs2_holder structures | |
1314 | * | |
1315 | * Returns: 0 on success (all glocks acquired), | |
1316 | * errno on failure (no glocks acquired) | |
1317 | */ | |
1318 | ||
1319 | int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) | |
1320 | { | |
1321 | struct gfs2_holder **p; | |
1322 | unsigned int x; | |
1323 | int error = 0; | |
1324 | ||
1325 | if (!num_gh) | |
1326 | return 0; | |
1327 | ||
1328 | if (num_gh == 1) { | |
1329 | ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1330 | if (ghs->gh_flags & GL_ATIME) | |
1331 | error = gfs2_glock_nq_atime(ghs); | |
1332 | else | |
1333 | error = gfs2_glock_nq(ghs); | |
1334 | return error; | |
1335 | } | |
1336 | ||
1337 | p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); | |
1338 | if (!p) | |
1339 | return -ENOMEM; | |
1340 | ||
1341 | for (x = 0; x < num_gh; x++) | |
1342 | p[x] = &ghs[x]; | |
1343 | ||
1344 | sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); | |
1345 | ||
1346 | for (x = 0; x < num_gh; x++) { | |
1347 | p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); | |
1348 | ||
1349 | if (p[x]->gh_flags & GL_ATIME) | |
1350 | error = gfs2_glock_nq_atime(p[x]); | |
1351 | else | |
1352 | error = gfs2_glock_nq(p[x]); | |
1353 | ||
1354 | if (error) { | |
1355 | while (x--) | |
1356 | gfs2_glock_dq(p[x]); | |
1357 | break; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | kfree(p); | |
b3b94faa DT |
1362 | return error; |
1363 | } | |
1364 | ||
b3b94faa DT |
1365 | |
1366 | static int | |
1367 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1368 | { | |
1369 | struct buffer_head *dibh; | |
1370 | int error; | |
1371 | ||
1372 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1373 | if (!error) { | |
feaa7bba SW |
1374 | error = inode_setattr(&ip->i_inode, attr); |
1375 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); | |
b3b94faa DT |
1376 | gfs2_inode_attr_out(ip); |
1377 | ||
d4e9c4c3 | 1378 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1379 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1380 | brelse(dibh); |
1381 | } | |
1382 | return error; | |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * gfs2_setattr_simple - | |
1387 | * @ip: | |
1388 | * @attr: | |
1389 | * | |
1390 | * Called with a reference on the vnode. | |
1391 | * | |
1392 | * Returns: errno | |
1393 | */ | |
1394 | ||
1395 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) | |
1396 | { | |
1397 | int error; | |
1398 | ||
5c676f6d | 1399 | if (current->journal_info) |
b3b94faa DT |
1400 | return __gfs2_setattr_simple(ip, attr); |
1401 | ||
feaa7bba | 1402 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
b3b94faa DT |
1403 | if (error) |
1404 | return error; | |
1405 | ||
1406 | error = __gfs2_setattr_simple(ip, attr); | |
feaa7bba | 1407 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
b3b94faa DT |
1408 | return error; |
1409 | } | |
1410 |