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Commit | Line | Data |
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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 | ||
06222e49 JB |
32 | /* Somebody else will have to figure out what to do here */ |
33 | if (whence == SEEK_DATA || whence == SEEK_HOLE) | |
34 | return -EINVAL; | |
35 | ||
9a311b96 | 36 | hpfs_lock(s); |
1da177e4 LT |
37 | |
38 | /*printk("dir lseek\n");*/ | |
39 | if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; | |
1b1dcc1b | 40 | mutex_lock(&i->i_mutex); |
1da177e4 LT |
41 | pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; |
42 | while (pos != new_off) { | |
43 | if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); | |
44 | else goto fail; | |
45 | if (pos == 12) goto fail; | |
46 | } | |
1b1dcc1b | 47 | mutex_unlock(&i->i_mutex); |
1da177e4 | 48 | ok: |
9a311b96 | 49 | hpfs_unlock(s); |
1da177e4 LT |
50 | return filp->f_pos = new_off; |
51 | fail: | |
1b1dcc1b | 52 | mutex_unlock(&i->i_mutex); |
1da177e4 | 53 | /*printk("illegal lseek: %016llx\n", new_off);*/ |
9a311b96 | 54 | hpfs_unlock(s); |
1da177e4 LT |
55 | return -ESPIPE; |
56 | } | |
57 | ||
58 | static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
59 | { | |
575800b3 | 60 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
61 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
62 | struct quad_buffer_head qbh; | |
63 | struct hpfs_dirent *de; | |
64 | int lc; | |
65 | long old_pos; | |
7e7742ee | 66 | unsigned char *tempname; |
1da177e4 LT |
67 | int c1, c2 = 0; |
68 | int ret = 0; | |
69 | ||
9a311b96 | 70 | hpfs_lock(inode->i_sb); |
1da177e4 LT |
71 | |
72 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
73 | if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { | |
74 | ret = -EFSERROR; | |
75 | goto out; | |
76 | } | |
77 | if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { | |
78 | ret = -EFSERROR; | |
79 | goto out; | |
80 | } | |
81 | } | |
82 | if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { | |
83 | struct buffer_head *bh; | |
84 | struct fnode *fno; | |
85 | int e = 0; | |
86 | if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { | |
87 | ret = -EIOERROR; | |
88 | goto out; | |
89 | } | |
90 | if (!fno->dirflag) { | |
91 | e = 1; | |
18debbbc RD |
92 | hpfs_error(inode->i_sb, "not a directory, fnode %08lx", |
93 | (unsigned long)inode->i_ino); | |
1da177e4 | 94 | } |
0b69760b | 95 | if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { |
1da177e4 | 96 | e = 1; |
0b69760b | 97 | 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 |
98 | } |
99 | brelse(bh); | |
100 | if (e) { | |
101 | ret = -EFSERROR; | |
102 | goto out; | |
103 | } | |
104 | } | |
105 | lc = hpfs_sb(inode->i_sb)->sb_lowercase; | |
106 | if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ | |
107 | filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ | |
108 | goto out; | |
109 | } | |
110 | if (filp->f_pos == 13) { | |
111 | ret = -ENOENT; | |
112 | goto out; | |
113 | } | |
114 | ||
115 | while (1) { | |
116 | again: | |
117 | /* This won't work when cycle is longer than number of dirents | |
118 | accepted by filldir, but what can I do? | |
119 | maybe killall -9 ls helps */ | |
120 | if (hpfs_sb(inode->i_sb)->sb_chk) | |
121 | if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { | |
122 | ret = -EFSERROR; | |
123 | goto out; | |
124 | } | |
125 | if (filp->f_pos == 12) | |
126 | goto out; | |
127 | if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { | |
128 | printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); | |
129 | goto out; | |
130 | } | |
131 | if (filp->f_pos == 0) { | |
132 | if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) | |
133 | goto out; | |
134 | filp->f_pos = 11; | |
135 | } | |
136 | if (filp->f_pos == 11) { | |
137 | if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) | |
138 | goto out; | |
139 | filp->f_pos = 1; | |
140 | } | |
141 | if (filp->f_pos == 1) { | |
142 | filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; | |
143 | hpfs_add_pos(inode, &filp->f_pos); | |
144 | filp->f_version = inode->i_version; | |
145 | } | |
146 | old_pos = filp->f_pos; | |
147 | if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { | |
148 | ret = -EIOERROR; | |
149 | goto out; | |
150 | } | |
151 | if (de->first || de->last) { | |
152 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
18debbbc RD |
153 | if (de->first && !de->last && (de->namelen != 2 |
154 | || de ->name[0] != 1 || de->name[1] != 1)) | |
155 | hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); | |
156 | if (de->last && (de->namelen != 1 || de ->name[0] != 255)) | |
157 | hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); | |
1da177e4 LT |
158 | } |
159 | hpfs_brelse4(&qbh); | |
160 | goto again; | |
161 | } | |
162 | tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); | |
0b69760b | 163 | if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { |
1da177e4 | 164 | filp->f_pos = old_pos; |
7e7742ee | 165 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
166 | hpfs_brelse4(&qbh); |
167 | goto out; | |
168 | } | |
7e7742ee | 169 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
170 | hpfs_brelse4(&qbh); |
171 | } | |
172 | out: | |
9a311b96 | 173 | hpfs_unlock(inode->i_sb); |
1da177e4 LT |
174 | return ret; |
175 | } | |
176 | ||
177 | /* | |
178 | * lookup. Search the specified directory for the specified name, set | |
179 | * *result to the corresponding inode. | |
180 | * | |
181 | * lookup uses the inode number to tell read_inode whether it is reading | |
182 | * the inode of a directory or a file -- file ino's are odd, directory | |
183 | * ino's are even. read_inode avoids i/o for file inodes; everything | |
184 | * needed is up here in the directory. (And file fnodes are out in | |
185 | * the boondocks.) | |
186 | * | |
187 | * - M.P.: this is over, sometimes we've got to read file's fnode for eas | |
188 | * inode numbers are just fnode sector numbers; iget lock is used | |
189 | * to tell read_inode to read fnode or not. | |
190 | */ | |
191 | ||
192 | struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
193 | { | |
7e7742ee | 194 | const unsigned char *name = dentry->d_name.name; |
1da177e4 LT |
195 | unsigned len = dentry->d_name.len; |
196 | struct quad_buffer_head qbh; | |
197 | struct hpfs_dirent *de; | |
198 | ino_t ino; | |
199 | int err; | |
200 | struct inode *result = NULL; | |
201 | struct hpfs_inode_info *hpfs_result; | |
202 | ||
9a311b96 | 203 | hpfs_lock(dir->i_sb); |
7e7742ee | 204 | if ((err = hpfs_chk_name(name, &len))) { |
1da177e4 | 205 | if (err == -ENAMETOOLONG) { |
9a311b96 | 206 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
207 | return ERR_PTR(-ENAMETOOLONG); |
208 | } | |
209 | goto end_add; | |
210 | } | |
211 | ||
212 | /* | |
213 | * '.' and '..' will never be passed here. | |
214 | */ | |
215 | ||
7e7742ee | 216 | de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); |
1da177e4 LT |
217 | |
218 | /* | |
219 | * This is not really a bailout, just means file not found. | |
220 | */ | |
221 | ||
222 | if (!de) goto end; | |
223 | ||
224 | /* | |
225 | * Get inode number, what we're after. | |
226 | */ | |
227 | ||
0b69760b | 228 | ino = le32_to_cpu(de->fnode); |
1da177e4 LT |
229 | |
230 | /* | |
231 | * Go find or make an inode. | |
232 | */ | |
233 | ||
234 | result = iget_locked(dir->i_sb, ino); | |
235 | if (!result) { | |
236 | hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); | |
237 | goto bail1; | |
238 | } | |
239 | if (result->i_state & I_NEW) { | |
240 | hpfs_init_inode(result); | |
241 | if (de->directory) | |
242 | hpfs_read_inode(result); | |
0b69760b | 243 | else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) |
1da177e4 LT |
244 | hpfs_read_inode(result); |
245 | else { | |
246 | result->i_mode |= S_IFREG; | |
247 | result->i_mode &= ~0111; | |
248 | result->i_op = &hpfs_file_iops; | |
249 | result->i_fop = &hpfs_file_ops; | |
bfe86848 | 250 | set_nlink(result, 1); |
1da177e4 LT |
251 | } |
252 | unlock_new_inode(result); | |
253 | } | |
254 | hpfs_result = hpfs_i(result); | |
255 | if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; | |
256 | ||
1da177e4 LT |
257 | if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { |
258 | 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"); | |
259 | goto bail1; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Fill in the info from the directory if this is a newly created | |
264 | * inode. | |
265 | */ | |
266 | ||
267 | if (!result->i_ctime.tv_sec) { | |
0b69760b | 268 | if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) |
1da177e4 LT |
269 | result->i_ctime.tv_sec = 1; |
270 | result->i_ctime.tv_nsec = 0; | |
0b69760b | 271 | result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); |
1da177e4 | 272 | result->i_mtime.tv_nsec = 0; |
0b69760b | 273 | result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); |
1da177e4 | 274 | result->i_atime.tv_nsec = 0; |
0b69760b | 275 | hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
276 | if (!hpfs_result->i_ea_mode && de->read_only) |
277 | result->i_mode &= ~0222; | |
278 | if (!de->directory) { | |
279 | if (result->i_size == -1) { | |
0b69760b | 280 | result->i_size = le32_to_cpu(de->file_size); |
1da177e4 LT |
281 | result->i_data.a_ops = &hpfs_aops; |
282 | hpfs_i(result)->mmu_private = result->i_size; | |
283 | /* | |
284 | * i_blocks should count the fnode and any anodes. | |
285 | * We count 1 for the fnode and don't bother about | |
286 | * anodes -- the disk heads are on the directory band | |
287 | * and we want them to stay there. | |
288 | */ | |
289 | result->i_blocks = 1 + ((result->i_size + 511) >> 9); | |
290 | } | |
291 | } | |
292 | } | |
293 | ||
294 | hpfs_brelse4(&qbh); | |
295 | ||
296 | /* | |
297 | * Made it. | |
298 | */ | |
299 | ||
300 | end: | |
301 | end_add: | |
9a311b96 | 302 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
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 | ||
9a311b96 | 315 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
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 | }; |