Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/hpfs/dir.c | |
3 | * | |
4 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 | |
5 | * | |
6 | * directory VFS functions | |
7 | */ | |
8 | ||
405f5571 | 9 | #include <linux/smp_lock.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
1da177e4 LT |
11 | #include "hpfs_fn.h" |
12 | ||
13 | static int hpfs_dir_release(struct inode *inode, struct file *filp) | |
14 | { | |
15 | lock_kernel(); | |
16 | hpfs_del_pos(inode, &filp->f_pos); | |
17 | /*hpfs_write_if_changed(inode);*/ | |
18 | unlock_kernel(); | |
19 | return 0; | |
20 | } | |
21 | ||
22 | /* This is slow, but it's not used often */ | |
23 | ||
24 | static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) | |
25 | { | |
26 | loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); | |
27 | loff_t pos; | |
28 | struct quad_buffer_head qbh; | |
575800b3 | 29 | struct inode *i = filp->f_path.dentry->d_inode; |
1da177e4 LT |
30 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
31 | struct super_block *s = i->i_sb; | |
32 | ||
33 | lock_kernel(); | |
34 | ||
35 | /*printk("dir lseek\n");*/ | |
36 | if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; | |
1b1dcc1b | 37 | mutex_lock(&i->i_mutex); |
1da177e4 LT |
38 | pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; |
39 | while (pos != new_off) { | |
40 | if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); | |
41 | else goto fail; | |
42 | if (pos == 12) goto fail; | |
43 | } | |
1b1dcc1b | 44 | mutex_unlock(&i->i_mutex); |
1da177e4 LT |
45 | ok: |
46 | unlock_kernel(); | |
47 | return filp->f_pos = new_off; | |
48 | fail: | |
1b1dcc1b | 49 | mutex_unlock(&i->i_mutex); |
1da177e4 LT |
50 | /*printk("illegal lseek: %016llx\n", new_off);*/ |
51 | unlock_kernel(); | |
52 | return -ESPIPE; | |
53 | } | |
54 | ||
55 | static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
56 | { | |
575800b3 | 57 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
58 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
59 | struct quad_buffer_head qbh; | |
60 | struct hpfs_dirent *de; | |
61 | int lc; | |
62 | long old_pos; | |
7e7742ee | 63 | unsigned char *tempname; |
1da177e4 LT |
64 | int c1, c2 = 0; |
65 | int ret = 0; | |
66 | ||
67 | lock_kernel(); | |
68 | ||
69 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
70 | if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { | |
71 | ret = -EFSERROR; | |
72 | goto out; | |
73 | } | |
74 | if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { | |
75 | ret = -EFSERROR; | |
76 | goto out; | |
77 | } | |
78 | } | |
79 | if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { | |
80 | struct buffer_head *bh; | |
81 | struct fnode *fno; | |
82 | int e = 0; | |
83 | if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { | |
84 | ret = -EIOERROR; | |
85 | goto out; | |
86 | } | |
87 | if (!fno->dirflag) { | |
88 | e = 1; | |
18debbbc RD |
89 | hpfs_error(inode->i_sb, "not a directory, fnode %08lx", |
90 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
91 | } |
92 | if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { | |
93 | e = 1; | |
94 | hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); | |
95 | } | |
96 | brelse(bh); | |
97 | if (e) { | |
98 | ret = -EFSERROR; | |
99 | goto out; | |
100 | } | |
101 | } | |
102 | lc = hpfs_sb(inode->i_sb)->sb_lowercase; | |
103 | if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ | |
104 | filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ | |
105 | goto out; | |
106 | } | |
107 | if (filp->f_pos == 13) { | |
108 | ret = -ENOENT; | |
109 | goto out; | |
110 | } | |
111 | ||
112 | while (1) { | |
113 | again: | |
114 | /* This won't work when cycle is longer than number of dirents | |
115 | accepted by filldir, but what can I do? | |
116 | maybe killall -9 ls helps */ | |
117 | if (hpfs_sb(inode->i_sb)->sb_chk) | |
118 | if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { | |
119 | ret = -EFSERROR; | |
120 | goto out; | |
121 | } | |
122 | if (filp->f_pos == 12) | |
123 | goto out; | |
124 | if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { | |
125 | printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); | |
126 | goto out; | |
127 | } | |
128 | if (filp->f_pos == 0) { | |
129 | if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) | |
130 | goto out; | |
131 | filp->f_pos = 11; | |
132 | } | |
133 | if (filp->f_pos == 11) { | |
134 | if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) | |
135 | goto out; | |
136 | filp->f_pos = 1; | |
137 | } | |
138 | if (filp->f_pos == 1) { | |
139 | filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; | |
140 | hpfs_add_pos(inode, &filp->f_pos); | |
141 | filp->f_version = inode->i_version; | |
142 | } | |
143 | old_pos = filp->f_pos; | |
144 | if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { | |
145 | ret = -EIOERROR; | |
146 | goto out; | |
147 | } | |
148 | if (de->first || de->last) { | |
149 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
18debbbc RD |
150 | if (de->first && !de->last && (de->namelen != 2 |
151 | || de ->name[0] != 1 || de->name[1] != 1)) | |
152 | hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); | |
153 | if (de->last && (de->namelen != 1 || de ->name[0] != 255)) | |
154 | hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); | |
1da177e4 LT |
155 | } |
156 | hpfs_brelse4(&qbh); | |
157 | goto again; | |
158 | } | |
159 | tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); | |
160 | if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { | |
161 | filp->f_pos = old_pos; | |
7e7742ee | 162 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
163 | hpfs_brelse4(&qbh); |
164 | goto out; | |
165 | } | |
7e7742ee | 166 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
167 | hpfs_brelse4(&qbh); |
168 | } | |
169 | out: | |
170 | unlock_kernel(); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | /* | |
175 | * lookup. Search the specified directory for the specified name, set | |
176 | * *result to the corresponding inode. | |
177 | * | |
178 | * lookup uses the inode number to tell read_inode whether it is reading | |
179 | * the inode of a directory or a file -- file ino's are odd, directory | |
180 | * ino's are even. read_inode avoids i/o for file inodes; everything | |
181 | * needed is up here in the directory. (And file fnodes are out in | |
182 | * the boondocks.) | |
183 | * | |
184 | * - M.P.: this is over, sometimes we've got to read file's fnode for eas | |
185 | * inode numbers are just fnode sector numbers; iget lock is used | |
186 | * to tell read_inode to read fnode or not. | |
187 | */ | |
188 | ||
189 | struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
190 | { | |
7e7742ee | 191 | const unsigned char *name = dentry->d_name.name; |
1da177e4 LT |
192 | unsigned len = dentry->d_name.len; |
193 | struct quad_buffer_head qbh; | |
194 | struct hpfs_dirent *de; | |
195 | ino_t ino; | |
196 | int err; | |
197 | struct inode *result = NULL; | |
198 | struct hpfs_inode_info *hpfs_result; | |
199 | ||
200 | lock_kernel(); | |
7e7742ee | 201 | if ((err = hpfs_chk_name(name, &len))) { |
1da177e4 LT |
202 | if (err == -ENAMETOOLONG) { |
203 | unlock_kernel(); | |
204 | return ERR_PTR(-ENAMETOOLONG); | |
205 | } | |
206 | goto end_add; | |
207 | } | |
208 | ||
209 | /* | |
210 | * '.' and '..' will never be passed here. | |
211 | */ | |
212 | ||
7e7742ee | 213 | de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); |
1da177e4 LT |
214 | |
215 | /* | |
216 | * This is not really a bailout, just means file not found. | |
217 | */ | |
218 | ||
219 | if (!de) goto end; | |
220 | ||
221 | /* | |
222 | * Get inode number, what we're after. | |
223 | */ | |
224 | ||
225 | ino = de->fnode; | |
226 | ||
227 | /* | |
228 | * Go find or make an inode. | |
229 | */ | |
230 | ||
231 | result = iget_locked(dir->i_sb, ino); | |
232 | if (!result) { | |
233 | hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); | |
234 | goto bail1; | |
235 | } | |
236 | if (result->i_state & I_NEW) { | |
237 | hpfs_init_inode(result); | |
238 | if (de->directory) | |
239 | hpfs_read_inode(result); | |
240 | else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) | |
241 | hpfs_read_inode(result); | |
242 | else { | |
243 | result->i_mode |= S_IFREG; | |
244 | result->i_mode &= ~0111; | |
245 | result->i_op = &hpfs_file_iops; | |
246 | result->i_fop = &hpfs_file_ops; | |
247 | result->i_nlink = 1; | |
248 | } | |
249 | unlock_new_inode(result); | |
250 | } | |
251 | hpfs_result = hpfs_i(result); | |
252 | if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; | |
253 | ||
7e7742ee | 254 | hpfs_decide_conv(result, name, len); |
1da177e4 LT |
255 | |
256 | if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { | |
257 | hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures"); | |
258 | goto bail1; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Fill in the info from the directory if this is a newly created | |
263 | * inode. | |
264 | */ | |
265 | ||
266 | if (!result->i_ctime.tv_sec) { | |
267 | if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) | |
268 | result->i_ctime.tv_sec = 1; | |
269 | result->i_ctime.tv_nsec = 0; | |
270 | result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); | |
271 | result->i_mtime.tv_nsec = 0; | |
272 | result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); | |
273 | result->i_atime.tv_nsec = 0; | |
274 | hpfs_result->i_ea_size = de->ea_size; | |
275 | if (!hpfs_result->i_ea_mode && de->read_only) | |
276 | result->i_mode &= ~0222; | |
277 | if (!de->directory) { | |
278 | if (result->i_size == -1) { | |
279 | result->i_size = de->file_size; | |
280 | result->i_data.a_ops = &hpfs_aops; | |
281 | hpfs_i(result)->mmu_private = result->i_size; | |
282 | /* | |
283 | * i_blocks should count the fnode and any anodes. | |
284 | * We count 1 for the fnode and don't bother about | |
285 | * anodes -- the disk heads are on the directory band | |
286 | * and we want them to stay there. | |
287 | */ | |
288 | result->i_blocks = 1 + ((result->i_size + 511) >> 9); | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
293 | hpfs_brelse4(&qbh); | |
294 | ||
295 | /* | |
296 | * Made it. | |
297 | */ | |
298 | ||
299 | end: | |
300 | end_add: | |
301 | hpfs_set_dentry_operations(dentry); | |
302 | unlock_kernel(); | |
303 | d_add(dentry, result); | |
304 | return NULL; | |
305 | ||
306 | /* | |
307 | * Didn't. | |
308 | */ | |
309 | bail1: | |
310 | ||
311 | hpfs_brelse4(&qbh); | |
312 | ||
313 | /*bail:*/ | |
314 | ||
315 | unlock_kernel(); | |
316 | return ERR_PTR(-ENOENT); | |
317 | } | |
318 | ||
4b6f5d20 | 319 | const struct file_operations hpfs_dir_ops = |
1da177e4 LT |
320 | { |
321 | .llseek = hpfs_dir_lseek, | |
322 | .read = generic_read_dir, | |
323 | .readdir = hpfs_readdir, | |
324 | .release = hpfs_dir_release, | |
325 | .fsync = hpfs_file_fsync, | |
326 | }; |