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12#include <linux/sched.h>
13#include <linux/gfp.h>
14#include "affs.h"
15
16extern const struct inode_operations affs_symlink_inode_operations;
17extern struct timezone sys_tz;
18
19struct inode *affs_iget(struct super_block *sb, unsigned long ino)
20{
21 struct affs_sb_info *sbi = AFFS_SB(sb);
22 struct buffer_head *bh;
23 struct affs_head *head;
24 struct affs_tail *tail;
25 struct inode *inode;
26 u32 block;
27 u32 size;
28 u32 prot;
29 u16 id;
30
31 inode = iget_locked(sb, ino);
32 if (!inode)
33 return ERR_PTR(-ENOMEM);
34 if (!(inode->i_state & I_NEW))
35 return inode;
36
37 pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
38
39 block = inode->i_ino;
40 bh = affs_bread(sb, block);
41 if (!bh) {
42 affs_warning(sb, "read_inode", "Cannot read block %d", block);
43 goto bad_inode;
44 }
45 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
46 affs_warning(sb,"read_inode",
47 "Checksum or type (ptype=%d) error on inode %d",
48 AFFS_HEAD(bh)->ptype, block);
49 goto bad_inode;
50 }
51
52 head = AFFS_HEAD(bh);
53 tail = AFFS_TAIL(sb, bh);
54 prot = be32_to_cpu(tail->protect);
55
56 inode->i_size = 0;
57 set_nlink(inode, 1);
58 inode->i_mode = 0;
59 AFFS_I(inode)->i_extcnt = 1;
60 AFFS_I(inode)->i_ext_last = ~1;
61 AFFS_I(inode)->i_protect = prot;
62 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
63 AFFS_I(inode)->i_blkcnt = 0;
64 AFFS_I(inode)->i_lc = NULL;
65 AFFS_I(inode)->i_lc_size = 0;
66 AFFS_I(inode)->i_lc_shift = 0;
67 AFFS_I(inode)->i_lc_mask = 0;
68 AFFS_I(inode)->i_ac = NULL;
69 AFFS_I(inode)->i_ext_bh = NULL;
70 AFFS_I(inode)->mmu_private = 0;
71 AFFS_I(inode)->i_lastalloc = 0;
72 AFFS_I(inode)->i_pa_cnt = 0;
73
74 if (sbi->s_flags & SF_SETMODE)
75 inode->i_mode = sbi->s_mode;
76 else
77 inode->i_mode = prot_to_mode(prot);
78
79 id = be16_to_cpu(tail->uid);
80 if (id == 0 || sbi->s_flags & SF_SETUID)
81 inode->i_uid = sbi->s_uid;
82 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
83 i_uid_write(inode, 0);
84 else
85 i_uid_write(inode, id);
86
87 id = be16_to_cpu(tail->gid);
88 if (id == 0 || sbi->s_flags & SF_SETGID)
89 inode->i_gid = sbi->s_gid;
90 else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
91 i_gid_write(inode, 0);
92 else
93 i_gid_write(inode, id);
94
95 switch (be32_to_cpu(tail->stype)) {
96 case ST_ROOT:
97 inode->i_uid = sbi->s_uid;
98 inode->i_gid = sbi->s_gid;
99
100 case ST_USERDIR:
101 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
102 sbi->s_flags & SF_SETMODE) {
103 if (inode->i_mode & S_IRUSR)
104 inode->i_mode |= S_IXUSR;
105 if (inode->i_mode & S_IRGRP)
106 inode->i_mode |= S_IXGRP;
107 if (inode->i_mode & S_IROTH)
108 inode->i_mode |= S_IXOTH;
109 inode->i_mode |= S_IFDIR;
110 } else
111 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
112
113
114 inode->i_op = &affs_dir_inode_operations;
115 inode->i_fop = &affs_dir_operations;
116 break;
117 case ST_LINKDIR:
118#if 0
119 affs_warning(sb, "read_inode", "inode is LINKDIR");
120 goto bad_inode;
121#else
122 inode->i_mode |= S_IFDIR;
123
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 set_nlink(inode, 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);
160 unlock_new_inode(inode);
161 return inode;
162
163bad_inode:
164 affs_brelse(bh);
165 iget_failed(inode);
166 return ERR_PTR(-EIO);
167}
168
169int
170affs_write_inode(struct inode *inode, struct writeback_control *wbc)
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
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 = i_uid_read(inode);
197 gid = i_gid_read(inode);
198 if (AFFS_SB(sb)->s_flags & SF_MUFS) {
199 if (uid == 0 || uid == 0xFFFF)
200 uid = uid ^ ~0;
201 if (gid == 0 || gid == 0xFFFF)
202 gid = 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 if ((attr->ia_valid & ATTR_SIZE) &&
239 attr->ia_size != i_size_read(inode)) {
240 error = inode_newsize_ok(inode, attr->ia_size);
241 if (error)
242 return error;
243
244 truncate_setsize(inode, attr->ia_size);
245 affs_truncate(inode);
246 }
247
248 setattr_copy(inode, attr);
249 mark_inode_dirty(inode);
250
251 if (attr->ia_valid & ATTR_MODE)
252 mode_to_prot(inode);
253out:
254 return error;
255}
256
257void
258affs_evict_inode(struct inode *inode)
259{
260 unsigned long cache_page;
261 pr_debug("AFFS: evict_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
262 truncate_inode_pages(&inode->i_data, 0);
263
264 if (!inode->i_nlink) {
265 inode->i_size = 0;
266 affs_truncate(inode);
267 }
268
269 invalidate_inode_buffers(inode);
270 clear_inode(inode);
271 affs_free_prealloc(inode);
272 cache_page = (unsigned long)AFFS_I(inode)->i_lc;
273 if (cache_page) {
274 pr_debug("AFFS: freeing ext cache\n");
275 AFFS_I(inode)->i_lc = NULL;
276 AFFS_I(inode)->i_ac = NULL;
277 free_page(cache_page);
278 }
279 affs_brelse(AFFS_I(inode)->i_ext_bh);
280 AFFS_I(inode)->i_ext_last = ~1;
281 AFFS_I(inode)->i_ext_bh = NULL;
282
283 if (!inode->i_nlink)
284 affs_free_block(inode->i_sb, inode->i_ino);
285}
286
287struct inode *
288affs_new_inode(struct inode *dir)
289{
290 struct super_block *sb = dir->i_sb;
291 struct inode *inode;
292 u32 block;
293 struct buffer_head *bh;
294
295 if (!(inode = new_inode(sb)))
296 goto err_inode;
297
298 if (!(block = affs_alloc_block(dir, dir->i_ino)))
299 goto err_block;
300
301 bh = affs_getzeroblk(sb, block);
302 if (!bh)
303 goto err_bh;
304 mark_buffer_dirty_inode(bh, inode);
305 affs_brelse(bh);
306
307 inode->i_uid = current_fsuid();
308 inode->i_gid = current_fsgid();
309 inode->i_ino = block;
310 set_nlink(inode, 1);
311 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
312 atomic_set(&AFFS_I(inode)->i_opencnt, 0);
313 AFFS_I(inode)->i_blkcnt = 0;
314 AFFS_I(inode)->i_lc = NULL;
315 AFFS_I(inode)->i_lc_size = 0;
316 AFFS_I(inode)->i_lc_shift = 0;
317 AFFS_I(inode)->i_lc_mask = 0;
318 AFFS_I(inode)->i_ac = NULL;
319 AFFS_I(inode)->i_ext_bh = NULL;
320 AFFS_I(inode)->mmu_private = 0;
321 AFFS_I(inode)->i_protect = 0;
322 AFFS_I(inode)->i_lastalloc = 0;
323 AFFS_I(inode)->i_pa_cnt = 0;
324 AFFS_I(inode)->i_extcnt = 1;
325 AFFS_I(inode)->i_ext_last = ~1;
326
327 insert_inode_hash(inode);
328
329 return inode;
330
331err_bh:
332 affs_free_block(sb, block);
333err_block:
334 iput(inode);
335err_inode:
336 return NULL;
337}
338
339
340
341
342
343
344int
345affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
346{
347 struct super_block *sb = dir->i_sb;
348 struct buffer_head *inode_bh = NULL;
349 struct buffer_head *bh = NULL;
350 u32 block = 0;
351 int retval;
352
353 pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
354 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
355
356 retval = -EIO;
357 bh = affs_bread(sb, inode->i_ino);
358 if (!bh)
359 goto done;
360
361 affs_lock_link(inode);
362 switch (type) {
363 case ST_LINKFILE:
364 case ST_LINKDIR:
365 retval = -ENOSPC;
366 block = affs_alloc_block(dir, dir->i_ino);
367 if (!block)
368 goto err;
369 retval = -EIO;
370 inode_bh = bh;
371 bh = affs_getzeroblk(sb, block);
372 if (!bh)
373 goto err;
374 break;
375 default:
376 break;
377 }
378
379 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
380 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
381 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
382 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
383 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
384
385 if (inode_bh) {
386 __be32 chain;
387 chain = AFFS_TAIL(sb, inode_bh)->link_chain;
388 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
389 AFFS_TAIL(sb, bh)->link_chain = chain;
390 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
391 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
392 mark_buffer_dirty_inode(inode_bh, inode);
393 set_nlink(inode, 2);
394 ihold(inode);
395 }
396 affs_fix_checksum(sb, bh);
397 mark_buffer_dirty_inode(bh, inode);
398 dentry->d_fsdata = (void *)(long)bh->b_blocknr;
399
400 affs_lock_dir(dir);
401 retval = affs_insert_hash(dir, bh);
402 mark_buffer_dirty_inode(bh, inode);
403 affs_unlock_dir(dir);
404 affs_unlock_link(inode);
405
406 d_instantiate(dentry, inode);
407done:
408 affs_brelse(inode_bh);
409 affs_brelse(bh);
410 return retval;
411err:
412 if (block)
413 affs_free_block(sb, block);
414 affs_unlock_link(inode);
415 goto done;
416}
417
