ia64/linux-2.6.18-xen.hg

view fs/affs/inode.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
13 #include "affs.h"
15 extern struct inode_operations affs_symlink_inode_operations;
16 extern struct timezone sys_tz;
18 void
19 affs_read_inode(struct inode *inode)
20 {
21 struct super_block *sb = inode->i_sb;
22 struct affs_sb_info *sbi = AFFS_SB(sb);
23 struct buffer_head *bh;
24 struct affs_head *head;
25 struct affs_tail *tail;
26 u32 block;
27 u32 size;
28 u32 prot;
29 u16 id;
31 pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
33 block = inode->i_ino;
34 bh = affs_bread(sb, block);
35 if (!bh) {
36 affs_warning(sb, "read_inode", "Cannot read block %d", block);
37 goto bad_inode;
38 }
39 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
40 affs_warning(sb,"read_inode",
41 "Checksum or type (ptype=%d) error on inode %d",
42 AFFS_HEAD(bh)->ptype, block);
43 goto bad_inode;
44 }
46 head = AFFS_HEAD(bh);
47 tail = AFFS_TAIL(sb, bh);
48 prot = be32_to_cpu(tail->protect);
50 inode->i_size = 0;
51 inode->i_nlink = 1;
52 inode->i_mode = 0;
53 AFFS_I(inode)->i_extcnt = 1;
54 AFFS_I(inode)->i_ext_last = ~1;
55 AFFS_I(inode)->i_protect = prot;
56 AFFS_I(inode)->i_opencnt = 0;
57 AFFS_I(inode)->i_blkcnt = 0;
58 AFFS_I(inode)->i_lc = NULL;
59 AFFS_I(inode)->i_lc_size = 0;
60 AFFS_I(inode)->i_lc_shift = 0;
61 AFFS_I(inode)->i_lc_mask = 0;
62 AFFS_I(inode)->i_ac = NULL;
63 AFFS_I(inode)->i_ext_bh = NULL;
64 AFFS_I(inode)->mmu_private = 0;
65 AFFS_I(inode)->i_lastalloc = 0;
66 AFFS_I(inode)->i_pa_cnt = 0;
68 if (sbi->s_flags & SF_SETMODE)
69 inode->i_mode = sbi->s_mode;
70 else
71 inode->i_mode = prot_to_mode(prot);
73 id = be16_to_cpu(tail->uid);
74 if (id == 0 || sbi->s_flags & SF_SETUID)
75 inode->i_uid = sbi->s_uid;
76 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
77 inode->i_uid = 0;
78 else
79 inode->i_uid = id;
81 id = be16_to_cpu(tail->gid);
82 if (id == 0 || sbi->s_flags & SF_SETGID)
83 inode->i_gid = sbi->s_gid;
84 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
85 inode->i_gid = 0;
86 else
87 inode->i_gid = id;
89 switch (be32_to_cpu(tail->stype)) {
90 case ST_ROOT:
91 inode->i_uid = sbi->s_uid;
92 inode->i_gid = sbi->s_gid;
93 /* fall through */
94 case ST_USERDIR:
95 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
96 sbi->s_flags & SF_SETMODE) {
97 if (inode->i_mode & S_IRUSR)
98 inode->i_mode |= S_IXUSR;
99 if (inode->i_mode & S_IRGRP)
100 inode->i_mode |= S_IXGRP;
101 if (inode->i_mode & S_IROTH)
102 inode->i_mode |= S_IXOTH;
103 inode->i_mode |= S_IFDIR;
104 } else
105 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
106 if (tail->link_chain)
107 inode->i_nlink = 2;
108 /* Maybe it should be controlled by mount parameter? */
109 //inode->i_mode |= S_ISVTX;
110 inode->i_op = &affs_dir_inode_operations;
111 inode->i_fop = &affs_dir_operations;
112 break;
113 case ST_LINKDIR:
114 #if 0
115 affs_warning(sb, "read_inode", "inode is LINKDIR");
116 goto bad_inode;
117 #else
118 inode->i_mode |= S_IFDIR;
119 inode->i_op = NULL;
120 inode->i_fop = NULL;
121 break;
122 #endif
123 case ST_LINKFILE:
124 affs_warning(sb, "read_inode", "inode is LINKFILE");
125 goto bad_inode;
126 case ST_FILE:
127 size = be32_to_cpu(tail->size);
128 inode->i_mode |= S_IFREG;
129 AFFS_I(inode)->mmu_private = inode->i_size = size;
130 if (inode->i_size) {
131 AFFS_I(inode)->i_blkcnt = (size - 1) /
132 sbi->s_data_blksize + 1;
133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
134 sbi->s_hashsize + 1;
135 }
136 if (tail->link_chain)
137 inode->i_nlink = 2;
138 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
139 inode->i_op = &affs_file_inode_operations;
140 inode->i_fop = &affs_file_operations;
141 break;
142 case ST_SOFTLINK:
143 inode->i_mode |= S_IFLNK;
144 inode->i_op = &affs_symlink_inode_operations;
145 inode->i_data.a_ops = &affs_symlink_aops;
146 break;
147 }
149 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
150 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
151 be32_to_cpu(tail->change.mins) * 60 +
152 be32_to_cpu(tail->change.ticks) / 50 +
153 ((8 * 365 + 2) * 24 * 60 * 60)) +
154 sys_tz.tz_minuteswest * 60;
155 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
156 affs_brelse(bh);
157 return;
159 bad_inode:
160 make_bad_inode(inode);
161 affs_brelse(bh);
162 return;
163 }
165 int
166 affs_write_inode(struct inode *inode, int unused)
167 {
168 struct super_block *sb = inode->i_sb;
169 struct buffer_head *bh;
170 struct affs_tail *tail;
171 uid_t uid;
172 gid_t gid;
174 pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
176 if (!inode->i_nlink)
177 // possibly free block
178 return 0;
179 bh = affs_bread(sb, inode->i_ino);
180 if (!bh) {
181 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
182 return -EIO;
183 }
184 tail = AFFS_TAIL(sb, bh);
185 if (tail->stype == cpu_to_be32(ST_ROOT)) {
186 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
187 } else {
188 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
189 tail->size = cpu_to_be32(inode->i_size);
190 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
191 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
192 uid = inode->i_uid;
193 gid = inode->i_gid;
194 if (AFFS_SB(sb)->s_flags & SF_MUFS) {
195 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
196 uid = inode->i_uid ^ ~0;
197 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
198 gid = inode->i_gid ^ ~0;
199 }
200 if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
201 tail->uid = cpu_to_be16(uid);
202 if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
203 tail->gid = cpu_to_be16(gid);
204 }
205 }
206 affs_fix_checksum(sb, bh);
207 mark_buffer_dirty_inode(bh, inode);
208 affs_brelse(bh);
209 affs_free_prealloc(inode);
210 return 0;
211 }
213 int
214 affs_notify_change(struct dentry *dentry, struct iattr *attr)
215 {
216 struct inode *inode = dentry->d_inode;
217 int error;
219 pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
221 error = inode_change_ok(inode,attr);
222 if (error)
223 goto out;
225 if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
226 ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
227 ((attr->ia_valid & ATTR_MODE) &&
228 (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
229 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
230 error = -EPERM;
231 goto out;
232 }
234 error = inode_setattr(inode, attr);
235 if (!error && (attr->ia_valid & ATTR_MODE))
236 mode_to_prot(inode);
237 out:
238 return error;
239 }
241 void
242 affs_put_inode(struct inode *inode)
243 {
244 pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
245 affs_free_prealloc(inode);
246 if (atomic_read(&inode->i_count) == 1) {
247 mutex_lock(&inode->i_mutex);
248 if (inode->i_size != AFFS_I(inode)->mmu_private)
249 affs_truncate(inode);
250 mutex_unlock(&inode->i_mutex);
251 }
252 }
254 void
255 affs_delete_inode(struct inode *inode)
256 {
257 pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
258 truncate_inode_pages(&inode->i_data, 0);
259 inode->i_size = 0;
260 if (S_ISREG(inode->i_mode))
261 affs_truncate(inode);
262 clear_inode(inode);
263 affs_free_block(inode->i_sb, inode->i_ino);
264 }
266 void
267 affs_clear_inode(struct inode *inode)
268 {
269 unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
271 pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
272 if (cache_page) {
273 pr_debug("AFFS: freeing ext cache\n");
274 AFFS_I(inode)->i_lc = NULL;
275 AFFS_I(inode)->i_ac = NULL;
276 free_page(cache_page);
277 }
278 affs_brelse(AFFS_I(inode)->i_ext_bh);
279 AFFS_I(inode)->i_ext_last = ~1;
280 AFFS_I(inode)->i_ext_bh = NULL;
281 }
283 struct inode *
284 affs_new_inode(struct inode *dir)
285 {
286 struct super_block *sb = dir->i_sb;
287 struct inode *inode;
288 u32 block;
289 struct buffer_head *bh;
291 if (!(inode = new_inode(sb)))
292 goto err_inode;
294 if (!(block = affs_alloc_block(dir, dir->i_ino)))
295 goto err_block;
297 bh = affs_getzeroblk(sb, block);
298 if (!bh)
299 goto err_bh;
300 mark_buffer_dirty_inode(bh, inode);
301 affs_brelse(bh);
303 inode->i_uid = current->fsuid;
304 inode->i_gid = current->fsgid;
305 inode->i_ino = block;
306 inode->i_nlink = 1;
307 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
308 AFFS_I(inode)->i_opencnt = 0;
309 AFFS_I(inode)->i_blkcnt = 0;
310 AFFS_I(inode)->i_lc = NULL;
311 AFFS_I(inode)->i_lc_size = 0;
312 AFFS_I(inode)->i_lc_shift = 0;
313 AFFS_I(inode)->i_lc_mask = 0;
314 AFFS_I(inode)->i_ac = NULL;
315 AFFS_I(inode)->i_ext_bh = NULL;
316 AFFS_I(inode)->mmu_private = 0;
317 AFFS_I(inode)->i_protect = 0;
318 AFFS_I(inode)->i_lastalloc = 0;
319 AFFS_I(inode)->i_pa_cnt = 0;
320 AFFS_I(inode)->i_extcnt = 1;
321 AFFS_I(inode)->i_ext_last = ~1;
323 insert_inode_hash(inode);
325 return inode;
327 err_bh:
328 affs_free_block(sb, block);
329 err_block:
330 iput(inode);
331 err_inode:
332 return NULL;
333 }
335 /*
336 * Add an entry to a directory. Create the header block
337 * and insert it into the hash table.
338 */
340 int
341 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
342 {
343 struct super_block *sb = dir->i_sb;
344 struct buffer_head *inode_bh = NULL;
345 struct buffer_head *bh = NULL;
346 u32 block = 0;
347 int retval;
349 pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
350 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
352 retval = -EIO;
353 bh = affs_bread(sb, inode->i_ino);
354 if (!bh)
355 goto done;
357 affs_lock_link(inode);
358 switch (type) {
359 case ST_LINKFILE:
360 case ST_LINKDIR:
361 inode_bh = bh;
362 retval = -ENOSPC;
363 block = affs_alloc_block(dir, dir->i_ino);
364 if (!block)
365 goto err;
366 retval = -EIO;
367 bh = affs_getzeroblk(sb, block);
368 if (!bh)
369 goto err;
370 break;
371 default:
372 break;
373 }
375 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
376 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
377 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
378 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
379 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
381 if (inode_bh) {
382 __be32 chain;
383 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
384 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
385 AFFS_TAIL(sb, bh)->link_chain = chain;
386 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
387 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
388 mark_buffer_dirty_inode(inode_bh, inode);
389 inode->i_nlink = 2;
390 atomic_inc(&inode->i_count);
391 }
392 affs_fix_checksum(sb, bh);
393 mark_buffer_dirty_inode(bh, inode);
394 dentry->d_fsdata = (void *)(long)bh->b_blocknr;
396 affs_lock_dir(dir);
397 retval = affs_insert_hash(dir, bh);
398 mark_buffer_dirty_inode(bh, inode);
399 affs_unlock_dir(dir);
400 affs_unlock_link(inode);
402 d_instantiate(dentry, inode);
403 done:
404 affs_brelse(inode_bh);
405 affs_brelse(bh);
406 return retval;
407 err:
408 if (block)
409 affs_free_block(sb, block);
410 affs_unlock_link(inode);
411 goto done;
412 }