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 <linux/slab.h>
10 #include "hpfs_fn.h"
11
hpfs_dir_release(struct inode * inode,struct file * filp)12 static int hpfs_dir_release(struct inode *inode, struct file *filp)
13 {
14 hpfs_lock(inode->i_sb);
15 hpfs_del_pos(inode, &filp->f_pos);
16 /*hpfs_write_if_changed(inode);*/
17 hpfs_unlock(inode->i_sb);
18 return 0;
19 }
20
21 /* This is slow, but it's not used often */
22
hpfs_dir_lseek(struct file * filp,loff_t off,int whence)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;
28 struct inode *i = filp->f_path.dentry->d_inode;
29 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
30 struct super_block *s = i->i_sb;
31
32 /* Somebody else will have to figure out what to do here */
33 if (whence == SEEK_DATA || whence == SEEK_HOLE)
34 return -EINVAL;
35
36 mutex_lock(&i->i_mutex);
37 hpfs_lock(s);
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;
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 }
47 hpfs_add_pos(i, &filp->f_pos);
48 ok:
49 filp->f_pos = new_off;
50 hpfs_unlock(s);
51 mutex_unlock(&i->i_mutex);
52 return new_off;
53 fail:
54 /*printk("illegal lseek: %016llx\n", new_off);*/
55 hpfs_unlock(s);
56 mutex_unlock(&i->i_mutex);
57 return -ESPIPE;
58 }
59
hpfs_readdir(struct file * filp,void * dirent,filldir_t filldir)60 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
61 {
62 struct inode *inode = filp->f_path.dentry->d_inode;
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;
68 unsigned char *tempname;
69 int c1, c2 = 0;
70 int ret = 0;
71
72 hpfs_lock(inode->i_sb);
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 }
92 if (!fno->dirflag) {
93 e = 1;
94 hpfs_error(inode->i_sb, "not a directory, fnode %08lx",
95 (unsigned long)inode->i_ino);
96 }
97 if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) {
98 e = 1;
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));
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) {
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);
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);
165 if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) {
166 filp->f_pos = old_pos;
167 if (tempname != de->name) kfree(tempname);
168 hpfs_brelse4(&qbh);
169 goto out;
170 }
171 if (tempname != de->name) kfree(tempname);
172 hpfs_brelse4(&qbh);
173 }
174 out:
175 hpfs_unlock(inode->i_sb);
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
hpfs_lookup(struct inode * dir,struct dentry * dentry,struct nameidata * nd)194 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
195 {
196 const unsigned char *name = dentry->d_name.name;
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
205 hpfs_lock(dir->i_sb);
206 if ((err = hpfs_chk_name(name, &len))) {
207 if (err == -ENAMETOOLONG) {
208 hpfs_unlock(dir->i_sb);
209 return ERR_PTR(-ENAMETOOLONG);
210 }
211 goto end_add;
212 }
213
214 /*
215 * '.' and '..' will never be passed here.
216 */
217
218 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh);
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
230 ino = le32_to_cpu(de->fnode);
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);
245 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas)
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;
252 set_nlink(result, 1);
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
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) {
270 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date))))
271 result->i_ctime.tv_sec = 1;
272 result->i_ctime.tv_nsec = 0;
273 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date));
274 result->i_mtime.tv_nsec = 0;
275 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date));
276 result->i_atime.tv_nsec = 0;
277 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size);
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) {
282 result->i_size = le32_to_cpu(de->file_size);
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:
304 hpfs_unlock(dir->i_sb);
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
317 hpfs_unlock(dir->i_sb);
318 return ERR_PTR(-ENOENT);
319 }
320
321 const struct file_operations hpfs_dir_ops =
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 };
329