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