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; | |
496ad9aa | 28 | struct inode *i = file_inode(filp); |
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 | ||
31abdab9 | 36 | mutex_lock(&i->i_mutex); |
9a311b96 | 37 | hpfs_lock(s); |
1da177e4 LT |
38 | |
39 | /*printk("dir lseek\n");*/ | |
40 | if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; | |
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 | } | |
31abdab9 | 47 | hpfs_add_pos(i, &filp->f_pos); |
1da177e4 | 48 | ok: |
31abdab9 | 49 | filp->f_pos = new_off; |
9a311b96 | 50 | hpfs_unlock(s); |
1b1dcc1b | 51 | mutex_unlock(&i->i_mutex); |
31abdab9 AV |
52 | return new_off; |
53 | fail: | |
1da177e4 | 54 | /*printk("illegal lseek: %016llx\n", new_off);*/ |
9a311b96 | 55 | hpfs_unlock(s); |
31abdab9 | 56 | mutex_unlock(&i->i_mutex); |
1da177e4 LT |
57 | return -ESPIPE; |
58 | } | |
59 | ||
60 | static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
61 | { | |
496ad9aa | 62 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
63 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
64 | struct quad_buffer_head qbh; | |
65 | struct hpfs_dirent *de; | |
66 | int lc; | |
67 | long old_pos; | |
7e7742ee | 68 | unsigned char *tempname; |
1da177e4 LT |
69 | int c1, c2 = 0; |
70 | int ret = 0; | |
71 | ||
9a311b96 | 72 | hpfs_lock(inode->i_sb); |
1da177e4 LT |
73 | |
74 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
75 | if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { | |
76 | ret = -EFSERROR; | |
77 | goto out; | |
78 | } | |
79 | if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { | |
80 | ret = -EFSERROR; | |
81 | goto out; | |
82 | } | |
83 | } | |
84 | if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { | |
85 | struct buffer_head *bh; | |
86 | struct fnode *fno; | |
87 | int e = 0; | |
88 | if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { | |
89 | ret = -EIOERROR; | |
90 | goto out; | |
91 | } | |
c4c99543 | 92 | if (!fnode_is_dir(fno)) { |
1da177e4 | 93 | e = 1; |
18debbbc RD |
94 | hpfs_error(inode->i_sb, "not a directory, fnode %08lx", |
95 | (unsigned long)inode->i_ino); | |
1da177e4 | 96 | } |
0b69760b | 97 | if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { |
1da177e4 | 98 | e = 1; |
0b69760b | 99 | 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 |
100 | } |
101 | brelse(bh); | |
102 | if (e) { | |
103 | ret = -EFSERROR; | |
104 | goto out; | |
105 | } | |
106 | } | |
107 | lc = hpfs_sb(inode->i_sb)->sb_lowercase; | |
108 | if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ | |
109 | filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ | |
110 | goto out; | |
111 | } | |
112 | if (filp->f_pos == 13) { | |
113 | ret = -ENOENT; | |
114 | goto out; | |
115 | } | |
116 | ||
117 | while (1) { | |
118 | again: | |
119 | /* This won't work when cycle is longer than number of dirents | |
120 | accepted by filldir, but what can I do? | |
121 | maybe killall -9 ls helps */ | |
122 | if (hpfs_sb(inode->i_sb)->sb_chk) | |
123 | if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { | |
124 | ret = -EFSERROR; | |
125 | goto out; | |
126 | } | |
127 | if (filp->f_pos == 12) | |
128 | goto out; | |
129 | if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { | |
130 | printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); | |
131 | goto out; | |
132 | } | |
133 | if (filp->f_pos == 0) { | |
134 | if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) | |
135 | goto out; | |
136 | filp->f_pos = 11; | |
137 | } | |
138 | if (filp->f_pos == 11) { | |
139 | if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) | |
140 | goto out; | |
141 | filp->f_pos = 1; | |
142 | } | |
143 | if (filp->f_pos == 1) { | |
144 | filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; | |
145 | hpfs_add_pos(inode, &filp->f_pos); | |
146 | filp->f_version = inode->i_version; | |
147 | } | |
148 | old_pos = filp->f_pos; | |
149 | if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { | |
150 | ret = -EIOERROR; | |
151 | goto out; | |
152 | } | |
153 | if (de->first || de->last) { | |
154 | if (hpfs_sb(inode->i_sb)->sb_chk) { | |
18debbbc RD |
155 | if (de->first && !de->last && (de->namelen != 2 |
156 | || de ->name[0] != 1 || de->name[1] != 1)) | |
157 | hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); | |
158 | if (de->last && (de->namelen != 1 || de ->name[0] != 255)) | |
159 | hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); | |
1da177e4 LT |
160 | } |
161 | hpfs_brelse4(&qbh); | |
162 | goto again; | |
163 | } | |
164 | tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); | |
0b69760b | 165 | if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { |
1da177e4 | 166 | filp->f_pos = old_pos; |
7e7742ee | 167 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
168 | hpfs_brelse4(&qbh); |
169 | goto out; | |
170 | } | |
7e7742ee | 171 | if (tempname != de->name) kfree(tempname); |
1da177e4 LT |
172 | hpfs_brelse4(&qbh); |
173 | } | |
174 | out: | |
9a311b96 | 175 | hpfs_unlock(inode->i_sb); |
1da177e4 LT |
176 | return ret; |
177 | } | |
178 | ||
179 | /* | |
180 | * lookup. Search the specified directory for the specified name, set | |
181 | * *result to the corresponding inode. | |
182 | * | |
183 | * lookup uses the inode number to tell read_inode whether it is reading | |
184 | * the inode of a directory or a file -- file ino's are odd, directory | |
185 | * ino's are even. read_inode avoids i/o for file inodes; everything | |
186 | * needed is up here in the directory. (And file fnodes are out in | |
187 | * the boondocks.) | |
188 | * | |
189 | * - M.P.: this is over, sometimes we've got to read file's fnode for eas | |
190 | * inode numbers are just fnode sector numbers; iget lock is used | |
191 | * to tell read_inode to read fnode or not. | |
192 | */ | |
193 | ||
00cd8dd3 | 194 | struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 195 | { |
7e7742ee | 196 | const unsigned char *name = dentry->d_name.name; |
1da177e4 LT |
197 | unsigned len = dentry->d_name.len; |
198 | struct quad_buffer_head qbh; | |
199 | struct hpfs_dirent *de; | |
200 | ino_t ino; | |
201 | int err; | |
202 | struct inode *result = NULL; | |
203 | struct hpfs_inode_info *hpfs_result; | |
204 | ||
9a311b96 | 205 | hpfs_lock(dir->i_sb); |
7e7742ee | 206 | if ((err = hpfs_chk_name(name, &len))) { |
1da177e4 | 207 | if (err == -ENAMETOOLONG) { |
9a311b96 | 208 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
209 | return ERR_PTR(-ENAMETOOLONG); |
210 | } | |
211 | goto end_add; | |
212 | } | |
213 | ||
214 | /* | |
215 | * '.' and '..' will never be passed here. | |
216 | */ | |
217 | ||
7e7742ee | 218 | de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); |
1da177e4 LT |
219 | |
220 | /* | |
221 | * This is not really a bailout, just means file not found. | |
222 | */ | |
223 | ||
224 | if (!de) goto end; | |
225 | ||
226 | /* | |
227 | * Get inode number, what we're after. | |
228 | */ | |
229 | ||
0b69760b | 230 | ino = le32_to_cpu(de->fnode); |
1da177e4 LT |
231 | |
232 | /* | |
233 | * Go find or make an inode. | |
234 | */ | |
235 | ||
236 | result = iget_locked(dir->i_sb, ino); | |
237 | if (!result) { | |
238 | hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); | |
239 | goto bail1; | |
240 | } | |
241 | if (result->i_state & I_NEW) { | |
242 | hpfs_init_inode(result); | |
243 | if (de->directory) | |
244 | hpfs_read_inode(result); | |
0b69760b | 245 | else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) |
1da177e4 LT |
246 | hpfs_read_inode(result); |
247 | else { | |
248 | result->i_mode |= S_IFREG; | |
249 | result->i_mode &= ~0111; | |
250 | result->i_op = &hpfs_file_iops; | |
251 | result->i_fop = &hpfs_file_ops; | |
bfe86848 | 252 | set_nlink(result, 1); |
1da177e4 LT |
253 | } |
254 | unlock_new_inode(result); | |
255 | } | |
256 | hpfs_result = hpfs_i(result); | |
257 | if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; | |
258 | ||
1da177e4 LT |
259 | if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { |
260 | 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"); | |
261 | goto bail1; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Fill in the info from the directory if this is a newly created | |
266 | * inode. | |
267 | */ | |
268 | ||
269 | if (!result->i_ctime.tv_sec) { | |
0b69760b | 270 | if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) |
1da177e4 LT |
271 | result->i_ctime.tv_sec = 1; |
272 | result->i_ctime.tv_nsec = 0; | |
0b69760b | 273 | result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); |
1da177e4 | 274 | result->i_mtime.tv_nsec = 0; |
0b69760b | 275 | result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); |
1da177e4 | 276 | result->i_atime.tv_nsec = 0; |
0b69760b | 277 | hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
278 | if (!hpfs_result->i_ea_mode && de->read_only) |
279 | result->i_mode &= ~0222; | |
280 | if (!de->directory) { | |
281 | if (result->i_size == -1) { | |
0b69760b | 282 | result->i_size = le32_to_cpu(de->file_size); |
1da177e4 LT |
283 | result->i_data.a_ops = &hpfs_aops; |
284 | hpfs_i(result)->mmu_private = result->i_size; | |
285 | /* | |
286 | * i_blocks should count the fnode and any anodes. | |
287 | * We count 1 for the fnode and don't bother about | |
288 | * anodes -- the disk heads are on the directory band | |
289 | * and we want them to stay there. | |
290 | */ | |
291 | result->i_blocks = 1 + ((result->i_size + 511) >> 9); | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | hpfs_brelse4(&qbh); | |
297 | ||
298 | /* | |
299 | * Made it. | |
300 | */ | |
301 | ||
302 | end: | |
303 | end_add: | |
9a311b96 | 304 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
305 | d_add(dentry, result); |
306 | return NULL; | |
307 | ||
308 | /* | |
309 | * Didn't. | |
310 | */ | |
311 | bail1: | |
312 | ||
313 | hpfs_brelse4(&qbh); | |
314 | ||
315 | /*bail:*/ | |
316 | ||
9a311b96 | 317 | hpfs_unlock(dir->i_sb); |
1da177e4 LT |
318 | return ERR_PTR(-ENOENT); |
319 | } | |
320 | ||
4b6f5d20 | 321 | const struct file_operations hpfs_dir_ops = |
1da177e4 LT |
322 | { |
323 | .llseek = hpfs_dir_lseek, | |
324 | .read = generic_read_dir, | |
325 | .readdir = hpfs_readdir, | |
326 | .release = hpfs_dir_release, | |
327 | .fsync = hpfs_file_fsync, | |
328 | }; |