4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 * directory VFS functions
11 static int hpfs_dir_release(struct inode *inode, struct file *filp)
14 hpfs_del_pos(inode, &filp->f_pos);
15 /*hpfs_write_if_changed(inode);*/
20 /* This is slow, but it's not used often */
22 static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
24 loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
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;
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 mutex_lock(&i->i_mutex);
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);
40 if (pos == 12) goto fail;
42 mutex_unlock(&i->i_mutex);
45 return filp->f_pos = new_off;
47 mutex_unlock(&i->i_mutex);
48 /*printk("illegal lseek: %016llx\n", new_off);*/
53 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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;
67 if (hpfs_sb(inode->i_sb)->sb_chk) {
68 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
72 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) {
77 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) {
78 struct buffer_head *bh;
81 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) {
87 hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
89 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) {
91 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno);
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) */
104 if (filp->f_pos == 13) {
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")) {
119 if (filp->f_pos == 12)
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);
125 if (filp->f_pos == 0) {
126 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
130 if (filp->f_pos == 11) {
131 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
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;
140 old_pos = filp->f_pos;
141 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
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);
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);
160 if (tempname != (char *)de->name) kfree(tempname);
169 * lookup. Search the specified directory for the specified name, set
170 * *result to the corresponding inode.
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
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.
183 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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;
191 struct inode *result = NULL;
192 struct hpfs_inode_info *hpfs_result;
195 if ((err = hpfs_chk_name((char *)name, &len))) {
196 if (err == -ENAMETOOLONG) {
198 return ERR_PTR(-ENAMETOOLONG);
204 * '.' and '..' will never be passed here.
207 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh);
210 * This is not really a bailout, just means file not found.
216 * Get inode number, what we're after.
222 * Go find or make an inode.
225 result = iget_locked(dir->i_sb, ino);
227 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
230 if (result->i_state & I_NEW) {
231 hpfs_init_inode(result);
233 hpfs_read_inode(result);
234 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas)
235 hpfs_read_inode(result);
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;
243 unlock_new_inode(result);
245 hpfs_result = hpfs_i(result);
246 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
248 hpfs_decide_conv(result, (char *)name, len);
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");
256 * Fill in the info from the directory if this is a newly created
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;
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.
282 result->i_blocks = 1 + ((result->i_size + 511) >> 9);
295 hpfs_set_dentry_operations(dentry);
297 d_add(dentry, result);
310 return ERR_PTR(-ENOENT);
313 struct file_operations hpfs_dir_ops =
315 .llseek = hpfs_dir_lseek,
316 .read = generic_read_dir,
317 .readdir = hpfs_readdir,
318 .release = hpfs_dir_release,
319 .fsync = hpfs_file_fsync,