2 * linux/fs/hpfs/namei.c
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 * adding & removing files & directories
8 #include <linux/sched.h>
9 #include <linux/smp_lock.h>
12 static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
14 const char *name = dentry->d_name.name;
15 unsigned len = dentry->d_name.len;
16 struct quad_buffer_head qbh0;
17 struct buffer_head *bh;
18 struct hpfs_dirent *de;
25 struct hpfs_dirent dee;
27 if ((err = hpfs_chk_name((char *)name, &len))) return err==-ENOENT ? -EINVAL : err;
30 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
33 dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0, 1);
36 memset(&dee, 0, sizeof dee);
38 if (!(mode & 0222)) dee.read_only = 1;
40 dee.hidden = name[0] == '.';
42 dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());
43 result = new_inode(dir->i_sb);
46 hpfs_init_inode(result);
48 hpfs_i(result)->i_parent_dir = dir->i_ino;
49 hpfs_i(result)->i_dno = dno;
50 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
51 result->i_ctime.tv_nsec = 0;
52 result->i_mtime.tv_nsec = 0;
53 result->i_atime.tv_nsec = 0;
54 hpfs_i(result)->i_ea_size = 0;
55 result->i_mode |= S_IFDIR;
56 result->i_op = &hpfs_dir_iops;
57 result->i_fop = &hpfs_dir_ops;
59 result->i_size = 2048;
62 result->i_mode &= ~0222;
64 mutex_lock(&hpfs_i(dir)->i_mutex);
65 r = hpfs_add_dirent(dir, (char *)name, len, &dee, 0);
73 memcpy(fnode->name, name, len > 15 ? 15 : len);
74 fnode->up = dir->i_ino;
76 fnode->btree.n_free_nodes = 7;
77 fnode->btree.n_used_nodes = 1;
78 fnode->btree.first_free = 0x14;
79 fnode->u.external[0].disk_secno = dno;
80 fnode->u.external[0].file_secno = -1;
81 dnode->root_dnode = 1;
83 de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
84 de->creation_date = de->write_date = de->read_date = gmt_to_local(dir->i_sb, get_seconds());
85 if (!(mode & 0222)) de->read_only = 1;
86 de->first = de->directory = 1;
87 /*de->hidden = de->system = 0;*/
89 mark_buffer_dirty(bh);
91 hpfs_mark_4buffers_dirty(&qbh0);
94 insert_inode_hash(result);
96 if (result->i_uid != current_fsuid() ||
97 result->i_gid != current_fsgid() ||
98 result->i_mode != (mode | S_IFDIR)) {
99 result->i_uid = current_fsuid();
100 result->i_gid = current_fsgid();
101 result->i_mode = mode | S_IFDIR;
102 hpfs_write_inode_nolock(result);
104 d_instantiate(dentry, result);
105 mutex_unlock(&hpfs_i(dir)->i_mutex);
109 mutex_unlock(&hpfs_i(dir)->i_mutex);
113 hpfs_free_dnode(dir->i_sb, dno);
116 hpfs_free_sectors(dir->i_sb, fno, 1);
122 static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
124 const char *name = dentry->d_name.name;
125 unsigned len = dentry->d_name.len;
126 struct inode *result = NULL;
127 struct buffer_head *bh;
131 struct hpfs_dirent dee;
133 if ((err = hpfs_chk_name((char *)name, &len)))
134 return err==-ENOENT ? -EINVAL : err;
137 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
140 memset(&dee, 0, sizeof dee);
141 if (!(mode & 0222)) dee.read_only = 1;
143 dee.hidden = name[0] == '.';
145 dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());
147 result = new_inode(dir->i_sb);
151 hpfs_init_inode(result);
153 result->i_mode |= S_IFREG;
154 result->i_mode &= ~0111;
155 result->i_op = &hpfs_file_iops;
156 result->i_fop = &hpfs_file_ops;
158 hpfs_decide_conv(result, (char *)name, len);
159 hpfs_i(result)->i_parent_dir = dir->i_ino;
160 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
161 result->i_ctime.tv_nsec = 0;
162 result->i_mtime.tv_nsec = 0;
163 result->i_atime.tv_nsec = 0;
164 hpfs_i(result)->i_ea_size = 0;
166 result->i_mode &= ~0222;
167 result->i_blocks = 1;
169 result->i_data.a_ops = &hpfs_aops;
170 hpfs_i(result)->mmu_private = 0;
172 mutex_lock(&hpfs_i(dir)->i_mutex);
173 r = hpfs_add_dirent(dir, (char *)name, len, &dee, 0);
181 memcpy(fnode->name, name, len > 15 ? 15 : len);
182 fnode->up = dir->i_ino;
183 mark_buffer_dirty(bh);
186 insert_inode_hash(result);
188 if (result->i_uid != current_fsuid() ||
189 result->i_gid != current_fsgid() ||
190 result->i_mode != (mode | S_IFREG)) {
191 result->i_uid = current_fsuid();
192 result->i_gid = current_fsgid();
193 result->i_mode = mode | S_IFREG;
194 hpfs_write_inode_nolock(result);
196 d_instantiate(dentry, result);
197 mutex_unlock(&hpfs_i(dir)->i_mutex);
202 mutex_unlock(&hpfs_i(dir)->i_mutex);
206 hpfs_free_sectors(dir->i_sb, fno, 1);
212 static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
214 const char *name = dentry->d_name.name;
215 unsigned len = dentry->d_name.len;
216 struct buffer_head *bh;
220 struct hpfs_dirent dee;
221 struct inode *result = NULL;
223 if ((err = hpfs_chk_name((char *)name, &len))) return err==-ENOENT ? -EINVAL : err;
224 if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
225 if (!new_valid_dev(rdev))
229 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
232 memset(&dee, 0, sizeof dee);
233 if (!(mode & 0222)) dee.read_only = 1;
235 dee.hidden = name[0] == '.';
237 dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());
239 result = new_inode(dir->i_sb);
243 hpfs_init_inode(result);
245 hpfs_i(result)->i_parent_dir = dir->i_ino;
246 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
247 result->i_ctime.tv_nsec = 0;
248 result->i_mtime.tv_nsec = 0;
249 result->i_atime.tv_nsec = 0;
250 hpfs_i(result)->i_ea_size = 0;
251 result->i_uid = current_fsuid();
252 result->i_gid = current_fsgid();
255 result->i_blocks = 1;
256 init_special_inode(result, mode, rdev);
258 mutex_lock(&hpfs_i(dir)->i_mutex);
259 r = hpfs_add_dirent(dir, (char *)name, len, &dee, 0);
267 memcpy(fnode->name, name, len > 15 ? 15 : len);
268 fnode->up = dir->i_ino;
269 mark_buffer_dirty(bh);
271 insert_inode_hash(result);
273 hpfs_write_inode_nolock(result);
274 d_instantiate(dentry, result);
275 mutex_unlock(&hpfs_i(dir)->i_mutex);
280 mutex_unlock(&hpfs_i(dir)->i_mutex);
284 hpfs_free_sectors(dir->i_sb, fno, 1);
290 static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
292 const char *name = dentry->d_name.name;
293 unsigned len = dentry->d_name.len;
294 struct buffer_head *bh;
298 struct hpfs_dirent dee;
299 struct inode *result;
301 if ((err = hpfs_chk_name((char *)name, &len))) return err==-ENOENT ? -EINVAL : err;
303 if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
308 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
311 memset(&dee, 0, sizeof dee);
313 dee.hidden = name[0] == '.';
315 dee.creation_date = dee.write_date = dee.read_date = gmt_to_local(dir->i_sb, get_seconds());
317 result = new_inode(dir->i_sb);
321 hpfs_init_inode(result);
322 hpfs_i(result)->i_parent_dir = dir->i_ino;
323 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, dee.creation_date);
324 result->i_ctime.tv_nsec = 0;
325 result->i_mtime.tv_nsec = 0;
326 result->i_atime.tv_nsec = 0;
327 hpfs_i(result)->i_ea_size = 0;
328 result->i_mode = S_IFLNK | 0777;
329 result->i_uid = current_fsuid();
330 result->i_gid = current_fsgid();
331 result->i_blocks = 1;
333 result->i_size = strlen(symlink);
334 result->i_op = &page_symlink_inode_operations;
335 result->i_data.a_ops = &hpfs_symlink_aops;
337 mutex_lock(&hpfs_i(dir)->i_mutex);
338 r = hpfs_add_dirent(dir, (char *)name, len, &dee, 0);
346 memcpy(fnode->name, name, len > 15 ? 15 : len);
347 fnode->up = dir->i_ino;
348 hpfs_set_ea(result, fnode, "SYMLINK", (char *)symlink, strlen(symlink));
349 mark_buffer_dirty(bh);
352 insert_inode_hash(result);
354 hpfs_write_inode_nolock(result);
355 d_instantiate(dentry, result);
356 mutex_unlock(&hpfs_i(dir)->i_mutex);
360 mutex_unlock(&hpfs_i(dir)->i_mutex);
364 hpfs_free_sectors(dir->i_sb, fno, 1);
370 static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
372 const char *name = dentry->d_name.name;
373 unsigned len = dentry->d_name.len;
374 struct quad_buffer_head qbh;
375 struct hpfs_dirent *de;
376 struct inode *inode = dentry->d_inode;
384 hpfs_adjust_length((char *)name, &len);
386 mutex_lock(&hpfs_i(inode)->i_parent_mutex);
387 mutex_lock(&hpfs_i(dir)->i_mutex);
389 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *)name, len, &dno, &qbh);
402 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
405 hpfs_error(dir->i_sb, "there was error when removing dirent");
408 case 2: /* no space for deleting, try to truncate file */
414 mutex_unlock(&hpfs_i(dir)->i_mutex);
415 mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
417 spin_lock(&dentry->d_lock);
418 if (atomic_read(&dentry->d_count) > 1 ||
419 generic_permission(inode, MAY_WRITE, NULL) ||
420 !S_ISREG(inode->i_mode) ||
421 get_write_access(inode)) {
422 spin_unlock(&dentry->d_lock);
425 struct iattr newattrs;
426 spin_unlock(&dentry->d_lock);
427 /*printk("HPFS: truncating file before delete.\n");*/
428 newattrs.ia_size = 0;
429 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
430 err = notify_change(dentry, &newattrs);
431 put_write_access(inode);
446 mutex_unlock(&hpfs_i(dir)->i_mutex);
447 mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
452 static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
454 const char *name = dentry->d_name.name;
455 unsigned len = dentry->d_name.len;
456 struct quad_buffer_head qbh;
457 struct hpfs_dirent *de;
458 struct inode *inode = dentry->d_inode;
465 hpfs_adjust_length((char *)name, &len);
467 mutex_lock(&hpfs_i(inode)->i_parent_mutex);
468 mutex_lock(&hpfs_i(dir)->i_mutex);
470 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *)name, len, &dno, &qbh);
482 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items);
488 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
491 hpfs_error(dir->i_sb, "there was error when removing dirent");
506 mutex_unlock(&hpfs_i(dir)->i_mutex);
507 mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
512 static int hpfs_symlink_readpage(struct file *file, struct page *page)
514 char *link = kmap(page);
515 struct inode *i = page->mapping->host;
517 struct buffer_head *bh;
522 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
524 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
529 SetPageUptodate(page);
542 const struct address_space_operations hpfs_symlink_aops = {
543 .readpage = hpfs_symlink_readpage
546 static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
547 struct inode *new_dir, struct dentry *new_dentry)
549 char *old_name = (char *)old_dentry->d_name.name;
550 int old_len = old_dentry->d_name.len;
551 char *new_name = (char *)new_dentry->d_name.name;
552 int new_len = new_dentry->d_name.len;
553 struct inode *i = old_dentry->d_inode;
554 struct inode *new_inode = new_dentry->d_inode;
555 struct quad_buffer_head qbh, qbh1;
556 struct hpfs_dirent *dep, *nde;
557 struct hpfs_dirent de;
560 struct buffer_head *bh;
563 if ((err = hpfs_chk_name((char *)new_name, &new_len))) return err;
565 hpfs_adjust_length((char *)old_name, &old_len);
568 /* order doesn't matter, due to VFS exclusion */
569 mutex_lock(&hpfs_i(i)->i_parent_mutex);
571 mutex_lock(&hpfs_i(new_inode)->i_parent_mutex);
572 mutex_lock(&hpfs_i(old_dir)->i_mutex);
573 if (new_dir != old_dir)
574 mutex_lock(&hpfs_i(new_dir)->i_mutex);
576 /* Erm? Moving over the empty non-busy directory is perfectly legal */
577 if (new_inode && S_ISDIR(new_inode->i_mode)) {
582 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, (char *)old_name, old_len, &dno, &qbh))) {
583 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed");
588 de.hidden = new_name[0] == '.';
592 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
593 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, (char *)new_name, new_len, NULL, &qbh1))) {
594 clear_nlink(new_inode);
596 memcpy(nde->name, new_name, new_len);
597 hpfs_mark_4buffers_dirty(&qbh1);
601 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
605 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0;
609 if (new_dir == old_dir) hpfs_brelse4(&qbh);
611 hpfs_lock_creation(i->i_sb);
612 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de, 1))) {
613 hpfs_unlock_creation(i->i_sb);
614 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
615 err = r == 1 ? -ENOSPC : -EFSERROR;
616 if (new_dir != old_dir) hpfs_brelse4(&qbh);
620 if (new_dir == old_dir)
621 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, (char *)old_name, old_len, &dno, &qbh))) {
622 hpfs_unlock_creation(i->i_sb);
623 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
628 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
629 hpfs_unlock_creation(i->i_sb);
630 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
631 err = r == 2 ? -ENOSPC : -EFSERROR;
634 hpfs_unlock_creation(i->i_sb);
637 hpfs_i(i)->i_parent_dir = new_dir->i_ino;
638 if (S_ISDIR(i->i_mode)) {
642 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
643 fnode->up = new_dir->i_ino;
644 fnode->len = new_len;
645 memcpy(fnode->name, new_name, new_len>15?15:new_len);
646 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
647 mark_buffer_dirty(bh);
650 hpfs_i(i)->i_conv = hpfs_sb(i->i_sb)->sb_conv;
651 hpfs_decide_conv(i, (char *)new_name, new_len);
653 if (old_dir != new_dir)
654 mutex_unlock(&hpfs_i(new_dir)->i_mutex);
655 mutex_unlock(&hpfs_i(old_dir)->i_mutex);
656 mutex_unlock(&hpfs_i(i)->i_parent_mutex);
658 mutex_unlock(&hpfs_i(new_inode)->i_parent_mutex);
663 const struct inode_operations hpfs_dir_iops =
665 .create = hpfs_create,
666 .lookup = hpfs_lookup,
667 .unlink = hpfs_unlink,
668 .symlink = hpfs_symlink,
672 .rename = hpfs_rename,
673 .setattr = hpfs_setattr,