blob: 6916c41d70176f97dd22326dd7d47d4a39abfdeb [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;
Josef Sipek575800b2006-12-08 02:37:06 -080027 struct inode *i = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 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{
Josef Sipek575800b2006-12-08 02:37:06 -080055 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 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;
Randy Dunlap18debbb2006-12-06 20:37:05 -080087 hpfs_error(inode->i_sb, "not a directory, fnode %08lx",
88 (unsigned long)inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
90 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) {
91 e = 1;
92 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno);
93 }
94 brelse(bh);
95 if (e) {
96 ret = -EFSERROR;
97 goto out;
98 }
99 }
100 lc = hpfs_sb(inode->i_sb)->sb_lowercase;
101 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
102 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
103 goto out;
104 }
105 if (filp->f_pos == 13) {
106 ret = -ENOENT;
107 goto out;
108 }
109
110 while (1) {
111 again:
112 /* This won't work when cycle is longer than number of dirents
113 accepted by filldir, but what can I do?
114 maybe killall -9 ls helps */
115 if (hpfs_sb(inode->i_sb)->sb_chk)
116 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
117 ret = -EFSERROR;
118 goto out;
119 }
120 if (filp->f_pos == 12)
121 goto out;
122 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
123 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
124 goto out;
125 }
126 if (filp->f_pos == 0) {
127 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
128 goto out;
129 filp->f_pos = 11;
130 }
131 if (filp->f_pos == 11) {
132 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
133 goto out;
134 filp->f_pos = 1;
135 }
136 if (filp->f_pos == 1) {
137 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
138 hpfs_add_pos(inode, &filp->f_pos);
139 filp->f_version = inode->i_version;
140 }
141 old_pos = filp->f_pos;
142 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
143 ret = -EIOERROR;
144 goto out;
145 }
146 if (de->first || de->last) {
147 if (hpfs_sb(inode->i_sb)->sb_chk) {
Randy Dunlap18debbb2006-12-06 20:37:05 -0800148 if (de->first && !de->last && (de->namelen != 2
149 || de ->name[0] != 1 || de->name[1] != 1))
150 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos);
151 if (de->last && (de->namelen != 1 || de ->name[0] != 255))
152 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
154 hpfs_brelse4(&qbh);
155 goto again;
156 }
157 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
158 if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
159 filp->f_pos = old_pos;
160 if (tempname != (char *)de->name) kfree(tempname);
161 hpfs_brelse4(&qbh);
162 goto out;
163 }
164 if (tempname != (char *)de->name) kfree(tempname);
165 hpfs_brelse4(&qbh);
166 }
167out:
168 unlock_kernel();
169 return ret;
170}
171
172/*
173 * lookup. Search the specified directory for the specified name, set
174 * *result to the corresponding inode.
175 *
176 * lookup uses the inode number to tell read_inode whether it is reading
177 * the inode of a directory or a file -- file ino's are odd, directory
178 * ino's are even. read_inode avoids i/o for file inodes; everything
179 * needed is up here in the directory. (And file fnodes are out in
180 * the boondocks.)
181 *
182 * - M.P.: this is over, sometimes we've got to read file's fnode for eas
183 * inode numbers are just fnode sector numbers; iget lock is used
184 * to tell read_inode to read fnode or not.
185 */
186
187struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
188{
189 const char *name = dentry->d_name.name;
190 unsigned len = dentry->d_name.len;
191 struct quad_buffer_head qbh;
192 struct hpfs_dirent *de;
193 ino_t ino;
194 int err;
195 struct inode *result = NULL;
196 struct hpfs_inode_info *hpfs_result;
197
198 lock_kernel();
199 if ((err = hpfs_chk_name((char *)name, &len))) {
200 if (err == -ENAMETOOLONG) {
201 unlock_kernel();
202 return ERR_PTR(-ENAMETOOLONG);
203 }
204 goto end_add;
205 }
206
207 /*
208 * '.' and '..' will never be passed here.
209 */
210
211 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh);
212
213 /*
214 * This is not really a bailout, just means file not found.
215 */
216
217 if (!de) goto end;
218
219 /*
220 * Get inode number, what we're after.
221 */
222
223 ino = de->fnode;
224
225 /*
226 * Go find or make an inode.
227 */
228
229 result = iget_locked(dir->i_sb, ino);
230 if (!result) {
231 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
232 goto bail1;
233 }
234 if (result->i_state & I_NEW) {
235 hpfs_init_inode(result);
236 if (de->directory)
237 hpfs_read_inode(result);
238 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas)
239 hpfs_read_inode(result);
240 else {
241 result->i_mode |= S_IFREG;
242 result->i_mode &= ~0111;
243 result->i_op = &hpfs_file_iops;
244 result->i_fop = &hpfs_file_ops;
245 result->i_nlink = 1;
246 }
247 unlock_new_inode(result);
248 }
249 hpfs_result = hpfs_i(result);
250 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
251
252 hpfs_decide_conv(result, (char *)name, len);
253
254 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
255 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");
256 goto bail1;
257 }
258
259 /*
260 * Fill in the info from the directory if this is a newly created
261 * inode.
262 */
263
264 if (!result->i_ctime.tv_sec) {
265 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date)))
266 result->i_ctime.tv_sec = 1;
267 result->i_ctime.tv_nsec = 0;
268 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date);
269 result->i_mtime.tv_nsec = 0;
270 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date);
271 result->i_atime.tv_nsec = 0;
272 hpfs_result->i_ea_size = de->ea_size;
273 if (!hpfs_result->i_ea_mode && de->read_only)
274 result->i_mode &= ~0222;
275 if (!de->directory) {
276 if (result->i_size == -1) {
277 result->i_size = de->file_size;
278 result->i_data.a_ops = &hpfs_aops;
279 hpfs_i(result)->mmu_private = result->i_size;
280 /*
281 * i_blocks should count the fnode and any anodes.
282 * We count 1 for the fnode and don't bother about
283 * anodes -- the disk heads are on the directory band
284 * and we want them to stay there.
285 */
286 result->i_blocks = 1 + ((result->i_size + 511) >> 9);
287 }
288 }
289 }
290
291 hpfs_brelse4(&qbh);
292
293 /*
294 * Made it.
295 */
296
297 end:
298 end_add:
299 hpfs_set_dentry_operations(dentry);
300 unlock_kernel();
301 d_add(dentry, result);
302 return NULL;
303
304 /*
305 * Didn't.
306 */
307 bail1:
308
309 hpfs_brelse4(&qbh);
310
311 /*bail:*/
312
313 unlock_kernel();
314 return ERR_PTR(-ENOENT);
315}
316
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800317const struct file_operations hpfs_dir_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 .llseek = hpfs_dir_lseek,
320 .read = generic_read_dir,
321 .readdir = hpfs_readdir,
322 .release = hpfs_dir_release,
323 .fsync = hpfs_file_fsync,
324};