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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040012#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include "affs.h"
14
Arjan van de Ven754661f2007-02-12 00:55:38 -080015extern const struct inode_operations affs_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070016extern struct timezone sys_tz;
17
David Howells210f8552008-02-07 00:15:29 -080018struct inode *affs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070019{
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 struct affs_sb_info *sbi = AFFS_SB(sb);
21 struct buffer_head *bh;
22 struct affs_head *head;
23 struct affs_tail *tail;
David Howells210f8552008-02-07 00:15:29 -080024 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 u32 block;
26 u32 size;
27 u32 prot;
28 u16 id;
29
David Howells210f8552008-02-07 00:15:29 -080030 inode = iget_locked(sb, ino);
31 if (!inode)
32 return ERR_PTR(-ENOMEM);
33 if (!(inode->i_state & I_NEW))
34 return inode;
35
36 pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38 block = inode->i_ino;
39 bh = affs_bread(sb, block);
40 if (!bh) {
41 affs_warning(sb, "read_inode", "Cannot read block %d", block);
42 goto bad_inode;
43 }
44 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
45 affs_warning(sb,"read_inode",
46 "Checksum or type (ptype=%d) error on inode %d",
47 AFFS_HEAD(bh)->ptype, block);
48 goto bad_inode;
49 }
50
51 head = AFFS_HEAD(bh);
52 tail = AFFS_TAIL(sb, bh);
53 prot = be32_to_cpu(tail->protect);
54
55 inode->i_size = 0;
56 inode->i_nlink = 1;
57 inode->i_mode = 0;
58 AFFS_I(inode)->i_extcnt = 1;
59 AFFS_I(inode)->i_ext_last = ~1;
60 AFFS_I(inode)->i_protect = prot;
Roman Zippeldca3c332008-04-29 17:02:20 +020061 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 AFFS_I(inode)->i_blkcnt = 0;
63 AFFS_I(inode)->i_lc = NULL;
64 AFFS_I(inode)->i_lc_size = 0;
65 AFFS_I(inode)->i_lc_shift = 0;
66 AFFS_I(inode)->i_lc_mask = 0;
67 AFFS_I(inode)->i_ac = NULL;
68 AFFS_I(inode)->i_ext_bh = NULL;
69 AFFS_I(inode)->mmu_private = 0;
70 AFFS_I(inode)->i_lastalloc = 0;
71 AFFS_I(inode)->i_pa_cnt = 0;
72
73 if (sbi->s_flags & SF_SETMODE)
74 inode->i_mode = sbi->s_mode;
75 else
76 inode->i_mode = prot_to_mode(prot);
77
78 id = be16_to_cpu(tail->uid);
79 if (id == 0 || sbi->s_flags & SF_SETUID)
80 inode->i_uid = sbi->s_uid;
81 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
82 inode->i_uid = 0;
83 else
84 inode->i_uid = id;
85
86 id = be16_to_cpu(tail->gid);
87 if (id == 0 || sbi->s_flags & SF_SETGID)
88 inode->i_gid = sbi->s_gid;
89 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
90 inode->i_gid = 0;
91 else
92 inode->i_gid = id;
93
94 switch (be32_to_cpu(tail->stype)) {
95 case ST_ROOT:
96 inode->i_uid = sbi->s_uid;
97 inode->i_gid = sbi->s_gid;
98 /* fall through */
99 case ST_USERDIR:
100 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
101 sbi->s_flags & SF_SETMODE) {
102 if (inode->i_mode & S_IRUSR)
103 inode->i_mode |= S_IXUSR;
104 if (inode->i_mode & S_IRGRP)
105 inode->i_mode |= S_IXGRP;
106 if (inode->i_mode & S_IROTH)
107 inode->i_mode |= S_IXOTH;
108 inode->i_mode |= S_IFDIR;
109 } else
110 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 /* Maybe it should be controlled by mount parameter? */
112 //inode->i_mode |= S_ISVTX;
113 inode->i_op = &affs_dir_inode_operations;
114 inode->i_fop = &affs_dir_operations;
115 break;
116 case ST_LINKDIR:
117#if 0
118 affs_warning(sb, "read_inode", "inode is LINKDIR");
119 goto bad_inode;
120#else
121 inode->i_mode |= S_IFDIR;
122 inode->i_op = NULL;
123 inode->i_fop = NULL;
124 break;
125#endif
126 case ST_LINKFILE:
127 affs_warning(sb, "read_inode", "inode is LINKFILE");
128 goto bad_inode;
129 case ST_FILE:
130 size = be32_to_cpu(tail->size);
131 inode->i_mode |= S_IFREG;
132 AFFS_I(inode)->mmu_private = inode->i_size = size;
133 if (inode->i_size) {
134 AFFS_I(inode)->i_blkcnt = (size - 1) /
135 sbi->s_data_blksize + 1;
136 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
137 sbi->s_hashsize + 1;
138 }
139 if (tail->link_chain)
140 inode->i_nlink = 2;
141 inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
142 inode->i_op = &affs_file_inode_operations;
143 inode->i_fop = &affs_file_operations;
144 break;
145 case ST_SOFTLINK:
146 inode->i_mode |= S_IFLNK;
147 inode->i_op = &affs_symlink_inode_operations;
148 inode->i_data.a_ops = &affs_symlink_aops;
149 break;
150 }
151
152 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
153 = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
154 be32_to_cpu(tail->change.mins) * 60 +
155 be32_to_cpu(tail->change.ticks) / 50 +
156 ((8 * 365 + 2) * 24 * 60 * 60)) +
157 sys_tz.tz_minuteswest * 60;
158 inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
159 affs_brelse(bh);
David Howells210f8552008-02-07 00:15:29 -0800160 unlock_new_inode(inode);
161 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163bad_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 affs_brelse(bh);
David Howells210f8552008-02-07 00:15:29 -0800165 iget_failed(inode);
166 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169int
170affs_write_inode(struct inode *inode, int unused)
171{
172 struct super_block *sb = inode->i_sb;
173 struct buffer_head *bh;
174 struct affs_tail *tail;
175 uid_t uid;
176 gid_t gid;
177
178 pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
179
180 if (!inode->i_nlink)
181 // possibly free block
182 return 0;
183 bh = affs_bread(sb, inode->i_ino);
184 if (!bh) {
185 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
186 return -EIO;
187 }
188 tail = AFFS_TAIL(sb, bh);
189 if (tail->stype == cpu_to_be32(ST_ROOT)) {
190 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
191 } else {
192 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
193 tail->size = cpu_to_be32(inode->i_size);
194 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
195 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
196 uid = inode->i_uid;
197 gid = inode->i_gid;
198 if (AFFS_SB(sb)->s_flags & SF_MUFS) {
199 if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
200 uid = inode->i_uid ^ ~0;
201 if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
202 gid = inode->i_gid ^ ~0;
203 }
204 if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
205 tail->uid = cpu_to_be16(uid);
206 if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
207 tail->gid = cpu_to_be16(gid);
208 }
209 }
210 affs_fix_checksum(sb, bh);
211 mark_buffer_dirty_inode(bh, inode);
212 affs_brelse(bh);
213 affs_free_prealloc(inode);
214 return 0;
215}
216
217int
218affs_notify_change(struct dentry *dentry, struct iattr *attr)
219{
220 struct inode *inode = dentry->d_inode;
221 int error;
222
223 pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
224
225 error = inode_change_ok(inode,attr);
226 if (error)
227 goto out;
228
229 if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
230 ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
231 ((attr->ia_valid & ATTR_MODE) &&
232 (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
233 if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
234 error = -EPERM;
235 goto out;
236 }
237
238 error = inode_setattr(inode, attr);
239 if (!error && (attr->ia_valid & ATTR_MODE))
240 mode_to_prot(inode);
241out:
242 return error;
243}
244
245void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246affs_delete_inode(struct inode *inode)
247{
248 pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
Mark Fashehfef26652005-09-09 13:01:31 -0700249 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 inode->i_size = 0;
Roman Zippeldca3c332008-04-29 17:02:20 +0200251 affs_truncate(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 clear_inode(inode);
253 affs_free_block(inode->i_sb, inode->i_ino);
254}
255
256void
257affs_clear_inode(struct inode *inode)
258{
Roman Zippeldca3c332008-04-29 17:02:20 +0200259 unsigned long cache_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
Roman Zippeldca3c332008-04-29 17:02:20 +0200262
263 affs_free_prealloc(inode);
264 cache_page = (unsigned long)AFFS_I(inode)->i_lc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 if (cache_page) {
266 pr_debug("AFFS: freeing ext cache\n");
267 AFFS_I(inode)->i_lc = NULL;
268 AFFS_I(inode)->i_ac = NULL;
269 free_page(cache_page);
270 }
271 affs_brelse(AFFS_I(inode)->i_ext_bh);
272 AFFS_I(inode)->i_ext_last = ~1;
273 AFFS_I(inode)->i_ext_bh = NULL;
274}
275
276struct inode *
277affs_new_inode(struct inode *dir)
278{
279 struct super_block *sb = dir->i_sb;
280 struct inode *inode;
281 u32 block;
282 struct buffer_head *bh;
283
284 if (!(inode = new_inode(sb)))
285 goto err_inode;
286
287 if (!(block = affs_alloc_block(dir, dir->i_ino)))
288 goto err_block;
289
290 bh = affs_getzeroblk(sb, block);
291 if (!bh)
292 goto err_bh;
293 mark_buffer_dirty_inode(bh, inode);
294 affs_brelse(bh);
295
296 inode->i_uid = current->fsuid;
297 inode->i_gid = current->fsgid;
298 inode->i_ino = block;
299 inode->i_nlink = 1;
300 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
Roman Zippeldca3c332008-04-29 17:02:20 +0200301 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 AFFS_I(inode)->i_blkcnt = 0;
303 AFFS_I(inode)->i_lc = NULL;
304 AFFS_I(inode)->i_lc_size = 0;
305 AFFS_I(inode)->i_lc_shift = 0;
306 AFFS_I(inode)->i_lc_mask = 0;
307 AFFS_I(inode)->i_ac = NULL;
308 AFFS_I(inode)->i_ext_bh = NULL;
309 AFFS_I(inode)->mmu_private = 0;
310 AFFS_I(inode)->i_protect = 0;
311 AFFS_I(inode)->i_lastalloc = 0;
312 AFFS_I(inode)->i_pa_cnt = 0;
313 AFFS_I(inode)->i_extcnt = 1;
314 AFFS_I(inode)->i_ext_last = ~1;
315
316 insert_inode_hash(inode);
317
318 return inode;
319
320err_bh:
321 affs_free_block(sb, block);
322err_block:
323 iput(inode);
324err_inode:
325 return NULL;
326}
327
328/*
329 * Add an entry to a directory. Create the header block
330 * and insert it into the hash table.
331 */
332
333int
334affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
335{
336 struct super_block *sb = dir->i_sb;
337 struct buffer_head *inode_bh = NULL;
338 struct buffer_head *bh = NULL;
339 u32 block = 0;
340 int retval;
341
342 pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
343 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
344
345 retval = -EIO;
346 bh = affs_bread(sb, inode->i_ino);
347 if (!bh)
348 goto done;
349
350 affs_lock_link(inode);
351 switch (type) {
352 case ST_LINKFILE:
353 case ST_LINKDIR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 retval = -ENOSPC;
355 block = affs_alloc_block(dir, dir->i_ino);
356 if (!block)
357 goto err;
358 retval = -EIO;
Roman Zippeldca3c332008-04-29 17:02:20 +0200359 inode_bh = bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 bh = affs_getzeroblk(sb, block);
361 if (!bh)
362 goto err;
363 break;
364 default:
365 break;
366 }
367
368 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
369 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
370 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
371 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
372 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
373
374 if (inode_bh) {
375 __be32 chain;
376 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
377 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
378 AFFS_TAIL(sb, bh)->link_chain = chain;
379 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
380 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
381 mark_buffer_dirty_inode(inode_bh, inode);
382 inode->i_nlink = 2;
383 atomic_inc(&inode->i_count);
384 }
385 affs_fix_checksum(sb, bh);
386 mark_buffer_dirty_inode(bh, inode);
387 dentry->d_fsdata = (void *)(long)bh->b_blocknr;
388
389 affs_lock_dir(dir);
390 retval = affs_insert_hash(dir, bh);
391 mark_buffer_dirty_inode(bh, inode);
392 affs_unlock_dir(dir);
393 affs_unlock_link(inode);
394
395 d_instantiate(dentry, inode);
396done:
397 affs_brelse(inode_bh);
398 affs_brelse(bh);
399 return retval;
400err:
401 if (block)
402 affs_free_block(sb, block);
403 affs_unlock_link(inode);
404 goto done;
405}