]>
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 | ||
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 LT |
10 | #include "hpfs_fn.h" |
11 | ||
12 | static int hpfs_dir_release(struct inode *inode, struct file *filp) | |
13 | { | |
9a311b96 | 14 | hpfs_lock(inode->i_sb); |
1da177e4 LT |
15 | hpfs_del_pos(inode, &filp->f_pos); |
16 | /*hpfs_write_if_changed(inode);*/ | |
9a311b96 | 17 | hpfs_unlock(inode->i_sb); |
1da177e4 LT |
18 | return 0; |
19 | } | |
20 | ||
21 | /* This is slow, but it's not used often */ | |
22 | ||
23 | static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) | |
24 | { | |
25 | loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); | |
26 | loff_t pos; | |
27 | struct quad_buffer_head qbh; | |
575800b3 | 28 | struct inode *i = filp->f_path.dentry->d_inode; |
1da177e4 LT |
29 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
30 | struct super_block *s = i->i_sb; | |
31 | ||
9a311b96 | 32 | hpfs_lock(s); |
1da177e4 LT |
33 | |
34 | /*printk("dir lseek\n");*/ | |
35 | if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; | |
1b1dcc1b | 36 | mutex_lock(&i->i_mutex); |
1da177e4 LT |
37 | pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; |
38 | while (pos != new_off) { | |
39 | if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); | |
40 | else goto fail; | |
41 | if (pos == 12) goto fail; | |
42 | } | |
1b1dcc1b | 43 | mutex_unlock(&i->i_mutex); |
1da177e4 | 44 | ok: |
9a311b96 | 45 | hpfs_unlock(s); |
1da177e4 LT |
46 | return filp->f_pos = new_off; |
47 | fail: | |
1b1dcc1b | 48 | mutex_unlock(&i->i_mutex); |
1da177e4 | 49 | /*printk("illegal lseek: %016llx\n", new_off);*/ |
9a311b96 | 50 | hpfs_unlock(s); |
1da177e4 LT |
51 | return -ESPIPE; |
52 | } | |
53 | ||
54 | static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
55 | { | |
575800b3 | 56 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
57 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
58 | struct quad_buffer_head qbh; | |
59 | struct hpfs_dirent *de; | |
60 | int lc; | |
61 | long old_pos; | |
7e7742ee | 62 | unsigned char *tempname; |
1da177e4 LT |
63 | int c1, c2 = 0; |
64 | int ret = 0; | |
65 | ||
9a311b96 | 66 | hpfs_lock(inode->i_sb); |
1da177e4 LT |
67 | |
68 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
69 | if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { | |
70 | ret = -EFSERROR; | |
71 | goto out; | |
72 | } | |
73 | if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { | |
74 | ret = -EFSERROR; | |
75 | goto out; | |
76 | } | |
77 | } | |
78 | if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { | |
79 | struct buffer_head *bh; | |
80 | struct fnode *fno; | |
81 | int e = 0; | |
82 | if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { | |
83 | ret = -EIOERROR; | |
84 | goto out; | |
85 | } | |
86 | if (!fno->dirflag) { | |
87 | e = 1; | |
18debbbc RD |
88 | hpfs_error(inode->i_sb, "not a directory, fnode %08lx", |
89 | (unsigned long)inode->i_ino); | |
1da177e4 | 90 | } |
0b69760b | 91 | if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { |
1da177e4 | 92 | e = 1; |
0b69760b | 93 | hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno)); |
1da177e4 LT |
94 | } |
95 | brelse(bh); | |
96 | if (e) { | |
97 | ret = -EFSERROR; | |
98 | goto out; | |
99 | } | |
100 | } | |
101 | lc = hpfs_sb(inode->i_sb)->sb_lowercase; | |
102 | if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ | |
103 | filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ | |
104 | goto out; | |
105 | } | |
106 | if (filp->f_pos == 13) { | |
107 | ret = -ENOENT; | |
108 | goto out; | |
109 | } | |
110 | ||
111 | while (1) { | |
112 | again: | |
113 | /* This won't work when cycle is longer than number of dirents | |
114 | accepted by filldir, but what can I do? | |
115 | maybe killall -9 ls helps */ | |
116 | if (hpfs_sb(inode->i_sb)->sb_chk) | |
117 | if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { | |
118 | ret = -EFSERROR; | |
119 | goto out; | |
120 | } | |
121 | if (filp->f_pos == 12) | |
122 | goto out; | |
123 | if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { | |
124 | printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); | |
125 | goto out; | |
126 | } | |
127 | if (filp->f_pos == 0) { | |
128 | if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) | |
129 | goto out; | |
130 | filp->f_pos = 11; | |
131 | } | |
132 | if (filp->f_pos == 11) { | |
133 | if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) | |
134 | goto out; | |
135 | filp->f_pos = 1; | |
136 | } | |
137 | if (filp->f_pos == 1) { | |
138 | filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; | |
139 | hpfs_add_pos(inode, &filp->f_pos); | |
140 | filp->f_version = inode->i_version; | |
141 | } | |
142 | old_pos = filp->f_pos; | |
143 | if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { | |
144 | ret = -EIOERROR; | |
145 | goto out; | |
146 | } | |
147 | if (de->first || de->last) { | |
148 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
18debbbc RD |
149 | if (de->first && !de->last && (de->namelen != 2 |
150 | || de ->name[0] != 1 || de->name[1] != 1)) | |
151 | hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); | |
152 | if (de->last && (de->namelen != 1 || de ->name[0] != 255)) | |
153 | hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); | |
1da177e4 LT |
154 | } |
155 | hpfs_brelse4(&qbh); | |
156 | goto again; | |
157 | } | |
158 | tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); | |
0b69760b | 159 | if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { |
1da177e4 | 160 | filp->f_pos = old_pos; |
7e7742ee | 161 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
162 | hpfs_brelse4(&qbh); |
163 | goto out; | |
164 | } | |
7e7742ee | 165 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
166 | hpfs_brelse4(&qbh); |
167 | } | |
168 | out: | |
9a311b96 | 169 | hpfs_unlock(inode->i_sb); |
1da177e4 LT |
170 | return ret; |
171 | } | |
172 | ||
173 | /* | |
174 | * lookup. Search the specified directory for the specified name, set | |
175 | * *result to the corresponding inode. | |
176 | * | |
177 | * lookup uses the inode number to tell read_inode whether it is reading | |
178 | * the inode of a directory or a file -- file ino's are odd, directory | |
179 | * ino's are even. read_inode avoids i/o for file inodes; everything | |
180 | * needed is up here in the directory. (And file fnodes are out in | |
181 | * the boondocks.) | |
182 | * | |
183 | * - M.P.: this is over, sometimes we've got to read file's fnode for eas | |
184 | * inode numbers are just fnode sector numbers; iget lock is used | |
185 | * to tell read_inode to read fnode or not. | |
186 | */ | |
187 | ||
188 | struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
189 | { | |
7e7742ee | 190 | const unsigned char *name = dentry->d_name.name; |
1da177e4 LT |
191 | unsigned len = dentry->d_name.len; |
192 | struct quad_buffer_head qbh; | |
193 | struct hpfs_dirent *de; | |
194 | ino_t ino; | |
195 | int err; | |
196 | struct inode *result = NULL; | |
197 | struct hpfs_inode_info *hpfs_result; | |
198 | ||
9a311b96 | 199 | hpfs_lock(dir->i_sb); |
7e7742ee | 200 | if ((err = hpfs_chk_name(name, &len))) { |
1da177e4 | 201 | if (err == -ENAMETOOLONG) { |
9a311b96 | 202 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
203 | return ERR_PTR(-ENAMETOOLONG); |
204 | } | |
205 | goto end_add; | |
206 | } | |
207 | ||
208 | /* | |
209 | * '.' and '..' will never be passed here. | |
210 | */ | |
211 | ||
7e7742ee | 212 | de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); |
1da177e4 LT |
213 | |
214 | /* | |
215 | * This is not really a bailout, just means file not found. | |
216 | */ | |
217 | ||
218 | if (!de) goto end; | |
219 | ||
220 | /* | |
221 | * Get inode number, what we're after. | |
222 | */ | |
223 | ||
0b69760b | 224 | ino = le32_to_cpu(de->fnode); |
1da177e4 LT |
225 | |
226 | /* | |
227 | * Go find or make an inode. | |
228 | */ | |
229 | ||
230 | result = iget_locked(dir->i_sb, ino); | |
231 | if (!result) { | |
232 | hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); | |
233 | goto bail1; | |
234 | } | |
235 | if (result->i_state & I_NEW) { | |
236 | hpfs_init_inode(result); | |
237 | if (de->directory) | |
238 | hpfs_read_inode(result); | |
0b69760b | 239 | else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) |
1da177e4 LT |
240 | hpfs_read_inode(result); |
241 | else { | |
242 | result->i_mode |= S_IFREG; | |
243 | result->i_mode &= ~0111; | |
244 | result->i_op = &hpfs_file_iops; | |
245 | result->i_fop = &hpfs_file_ops; | |
246 | result->i_nlink = 1; | |
247 | } | |
248 | unlock_new_inode(result); | |
249 | } | |
250 | hpfs_result = hpfs_i(result); | |
251 | if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; | |
252 | ||
1da177e4 LT |
253 | if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { |
254 | 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"); | |
255 | goto bail1; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Fill in the info from the directory if this is a newly created | |
260 | * inode. | |
261 | */ | |
262 | ||
263 | if (!result->i_ctime.tv_sec) { | |
0b69760b | 264 | if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) |
1da177e4 LT |
265 | result->i_ctime.tv_sec = 1; |
266 | result->i_ctime.tv_nsec = 0; | |
0b69760b | 267 | result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); |
1da177e4 | 268 | result->i_mtime.tv_nsec = 0; |
0b69760b | 269 | result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); |
1da177e4 | 270 | result->i_atime.tv_nsec = 0; |
0b69760b | 271 | hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
272 | if (!hpfs_result->i_ea_mode && de->read_only) |
273 | result->i_mode &= ~0222; | |
274 | if (!de->directory) { | |
275 | if (result->i_size == -1) { | |
0b69760b | 276 | result->i_size = le32_to_cpu(de->file_size); |
1da177e4 LT |
277 | result->i_data.a_ops = &hpfs_aops; |
278 | hpfs_i(result)->mmu_private = result->i_size; | |
279 | /* | |
280 | * i_blocks should count the fnode and any anodes. | |
281 | * We count 1 for the fnode and don't bother about | |
282 | * anodes -- the disk heads are on the directory band | |
283 | * and we want them to stay there. | |
284 | */ | |
285 | result->i_blocks = 1 + ((result->i_size + 511) >> 9); | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | hpfs_brelse4(&qbh); | |
291 | ||
292 | /* | |
293 | * Made it. | |
294 | */ | |
295 | ||
296 | end: | |
297 | end_add: | |
9a311b96 | 298 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
299 | d_add(dentry, result); |
300 | return NULL; | |
301 | ||
302 | /* | |
303 | * Didn't. | |
304 | */ | |
305 | bail1: | |
306 | ||
307 | hpfs_brelse4(&qbh); | |
308 | ||
309 | /*bail:*/ | |
310 | ||
9a311b96 | 311 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
312 | return ERR_PTR(-ENOENT); |
313 | } | |
314 | ||
4b6f5d20 | 315 | const struct file_operations hpfs_dir_ops = |
1da177e4 LT |
316 | { |
317 | .llseek = hpfs_dir_lseek, | |
318 | .read = generic_read_dir, | |
319 | .readdir = hpfs_readdir, | |
320 | .release = hpfs_dir_release, | |
321 | .fsync = hpfs_file_fsync, | |
322 | }; |