blob: ecc9180645ae1a12b70beab00bc5561f602c4a65 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
11static 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
22static 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;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080035 mutex_lock(&i->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 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 }
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080042 mutex_unlock(&i->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043ok:
44 unlock_kernel();
45 return filp->f_pos = new_off;
46fail:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -080047 mutex_unlock(&i->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 /*printk("illegal lseek: %016llx\n", new_off);*/
49 unlock_kernel();
50 return -ESPIPE;
51}
52
53static 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 }
163out:
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
183struct 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
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800313const struct file_operations hpfs_dir_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
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};