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>
11 static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
13 const unsigned char *name = dentry->d_name.name;
14 unsigned len = dentry->d_name.len;
15 struct quad_buffer_head qbh0;
16 struct buffer_head *bh;
17 struct hpfs_dirent *de;
24 struct hpfs_dirent dee;
26 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
29 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
32 dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0);
35 memset(&dee, 0, sizeof dee);
37 if (!(mode & 0222)) dee.read_only = 1;
39 dee.hidden = name[0] == '.';
40 dee.fnode = cpu_to_le32(fno);
41 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
42 result = new_inode(dir->i_sb);
45 hpfs_init_inode(result);
47 hpfs_i(result)->i_parent_dir = dir->i_ino;
48 hpfs_i(result)->i_dno = dno;
49 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
50 result->i_ctime.tv_nsec = 0;
51 result->i_mtime.tv_nsec = 0;
52 result->i_atime.tv_nsec = 0;
53 hpfs_i(result)->i_ea_size = 0;
54 result->i_mode |= S_IFDIR;
55 result->i_op = &hpfs_dir_iops;
56 result->i_fop = &hpfs_dir_ops;
58 result->i_size = 2048;
61 result->i_mode &= ~0222;
63 r = hpfs_add_dirent(dir, name, len, &dee);
71 memcpy(fnode->name, name, len > 15 ? 15 : len);
72 fnode->up = cpu_to_le32(dir->i_ino);
74 fnode->btree.n_free_nodes = 7;
75 fnode->btree.n_used_nodes = 1;
76 fnode->btree.first_free = cpu_to_le16(0x14);
77 fnode->u.external[0].disk_secno = cpu_to_le32(dno);
78 fnode->u.external[0].file_secno = cpu_to_le32(-1);
79 dnode->root_dnode = 1;
80 dnode->up = cpu_to_le32(fno);
81 de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0);
82 de->creation_date = de->write_date = de->read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
83 if (!(mode & 0222)) de->read_only = 1;
84 de->first = de->directory = 1;
85 /*de->hidden = de->system = 0;*/
86 de->fnode = cpu_to_le32(fno);
87 mark_buffer_dirty(bh);
89 hpfs_mark_4buffers_dirty(&qbh0);
92 insert_inode_hash(result);
94 if (result->i_uid != current_fsuid() ||
95 result->i_gid != current_fsgid() ||
96 result->i_mode != (mode | S_IFDIR)) {
97 result->i_uid = current_fsuid();
98 result->i_gid = current_fsgid();
99 result->i_mode = mode | S_IFDIR;
100 hpfs_write_inode_nolock(result);
102 d_instantiate(dentry, result);
103 hpfs_unlock(dir->i_sb);
109 hpfs_free_dnode(dir->i_sb, dno);
112 hpfs_free_sectors(dir->i_sb, fno, 1);
114 hpfs_unlock(dir->i_sb);
118 static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
120 const unsigned char *name = dentry->d_name.name;
121 unsigned len = dentry->d_name.len;
122 struct inode *result = NULL;
123 struct buffer_head *bh;
127 struct hpfs_dirent dee;
129 if ((err = hpfs_chk_name(name, &len)))
130 return err==-ENOENT ? -EINVAL : err;
131 hpfs_lock(dir->i_sb);
133 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
136 memset(&dee, 0, sizeof dee);
137 if (!(mode & 0222)) dee.read_only = 1;
139 dee.hidden = name[0] == '.';
140 dee.fnode = cpu_to_le32(fno);
141 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
143 result = new_inode(dir->i_sb);
147 hpfs_init_inode(result);
149 result->i_mode |= S_IFREG;
150 result->i_mode &= ~0111;
151 result->i_op = &hpfs_file_iops;
152 result->i_fop = &hpfs_file_ops;
153 set_nlink(result, 1);
154 hpfs_i(result)->i_parent_dir = dir->i_ino;
155 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
156 result->i_ctime.tv_nsec = 0;
157 result->i_mtime.tv_nsec = 0;
158 result->i_atime.tv_nsec = 0;
159 hpfs_i(result)->i_ea_size = 0;
161 result->i_mode &= ~0222;
162 result->i_blocks = 1;
164 result->i_data.a_ops = &hpfs_aops;
165 hpfs_i(result)->mmu_private = 0;
167 r = hpfs_add_dirent(dir, name, len, &dee);
175 memcpy(fnode->name, name, len > 15 ? 15 : len);
176 fnode->up = cpu_to_le32(dir->i_ino);
177 mark_buffer_dirty(bh);
180 insert_inode_hash(result);
182 if (result->i_uid != current_fsuid() ||
183 result->i_gid != current_fsgid() ||
184 result->i_mode != (mode | S_IFREG)) {
185 result->i_uid = current_fsuid();
186 result->i_gid = current_fsgid();
187 result->i_mode = mode | S_IFREG;
188 hpfs_write_inode_nolock(result);
190 d_instantiate(dentry, result);
191 hpfs_unlock(dir->i_sb);
198 hpfs_free_sectors(dir->i_sb, fno, 1);
200 hpfs_unlock(dir->i_sb);
204 static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
206 const unsigned char *name = dentry->d_name.name;
207 unsigned len = dentry->d_name.len;
208 struct buffer_head *bh;
212 struct hpfs_dirent dee;
213 struct inode *result = NULL;
215 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
216 if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
217 if (!new_valid_dev(rdev))
219 hpfs_lock(dir->i_sb);
221 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
224 memset(&dee, 0, sizeof dee);
225 if (!(mode & 0222)) dee.read_only = 1;
227 dee.hidden = name[0] == '.';
228 dee.fnode = cpu_to_le32(fno);
229 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
231 result = new_inode(dir->i_sb);
235 hpfs_init_inode(result);
237 hpfs_i(result)->i_parent_dir = dir->i_ino;
238 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
239 result->i_ctime.tv_nsec = 0;
240 result->i_mtime.tv_nsec = 0;
241 result->i_atime.tv_nsec = 0;
242 hpfs_i(result)->i_ea_size = 0;
243 result->i_uid = current_fsuid();
244 result->i_gid = current_fsgid();
245 set_nlink(result, 1);
247 result->i_blocks = 1;
248 init_special_inode(result, mode, rdev);
250 r = hpfs_add_dirent(dir, name, len, &dee);
258 memcpy(fnode->name, name, len > 15 ? 15 : len);
259 fnode->up = cpu_to_le32(dir->i_ino);
260 mark_buffer_dirty(bh);
262 insert_inode_hash(result);
264 hpfs_write_inode_nolock(result);
265 d_instantiate(dentry, result);
267 hpfs_unlock(dir->i_sb);
273 hpfs_free_sectors(dir->i_sb, fno, 1);
275 hpfs_unlock(dir->i_sb);
279 static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
281 const unsigned char *name = dentry->d_name.name;
282 unsigned len = dentry->d_name.len;
283 struct buffer_head *bh;
287 struct hpfs_dirent dee;
288 struct inode *result;
290 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
291 hpfs_lock(dir->i_sb);
292 if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
293 hpfs_unlock(dir->i_sb);
297 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
300 memset(&dee, 0, sizeof dee);
302 dee.hidden = name[0] == '.';
303 dee.fnode = cpu_to_le32(fno);
304 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds()));
306 result = new_inode(dir->i_sb);
310 hpfs_init_inode(result);
311 hpfs_i(result)->i_parent_dir = dir->i_ino;
312 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date));
313 result->i_ctime.tv_nsec = 0;
314 result->i_mtime.tv_nsec = 0;
315 result->i_atime.tv_nsec = 0;
316 hpfs_i(result)->i_ea_size = 0;
317 result->i_mode = S_IFLNK | 0777;
318 result->i_uid = current_fsuid();
319 result->i_gid = current_fsgid();
320 result->i_blocks = 1;
321 set_nlink(result, 1);
322 result->i_size = strlen(symlink);
323 result->i_op = &page_symlink_inode_operations;
324 result->i_data.a_ops = &hpfs_symlink_aops;
326 r = hpfs_add_dirent(dir, name, len, &dee);
334 memcpy(fnode->name, name, len > 15 ? 15 : len);
335 fnode->up = cpu_to_le32(dir->i_ino);
336 hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink));
337 mark_buffer_dirty(bh);
340 insert_inode_hash(result);
342 hpfs_write_inode_nolock(result);
343 d_instantiate(dentry, result);
344 hpfs_unlock(dir->i_sb);
350 hpfs_free_sectors(dir->i_sb, fno, 1);
352 hpfs_unlock(dir->i_sb);
356 static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
358 const unsigned char *name = dentry->d_name.name;
359 unsigned len = dentry->d_name.len;
360 struct quad_buffer_head qbh;
361 struct hpfs_dirent *de;
362 struct inode *inode = dentry->d_inode;
368 hpfs_lock(dir->i_sb);
369 hpfs_adjust_length(name, &len);
372 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
384 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
387 hpfs_error(dir->i_sb, "there was error when removing dirent");
390 case 2: /* no space for deleting, try to truncate file */
396 dentry_unhash(dentry);
397 if (!d_unhashed(dentry)) {
398 hpfs_unlock(dir->i_sb);
401 if (generic_permission(inode, MAY_WRITE) ||
402 !S_ISREG(inode->i_mode) ||
403 get_write_access(inode)) {
406 struct iattr newattrs;
407 /*printk("HPFS: truncating file before delete.\n");*/
408 newattrs.ia_size = 0;
409 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
410 err = notify_change(dentry, &newattrs);
411 put_write_access(inode);
415 hpfs_unlock(dir->i_sb);
426 hpfs_unlock(dir->i_sb);
430 static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
432 const unsigned char *name = dentry->d_name.name;
433 unsigned len = dentry->d_name.len;
434 struct quad_buffer_head qbh;
435 struct hpfs_dirent *de;
436 struct inode *inode = dentry->d_inode;
442 hpfs_adjust_length(name, &len);
443 hpfs_lock(dir->i_sb);
445 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
457 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items);
462 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1);
465 hpfs_error(dir->i_sb, "there was error when removing dirent");
480 hpfs_unlock(dir->i_sb);
484 static int hpfs_symlink_readpage(struct file *file, struct page *page)
486 char *link = kmap(page);
487 struct inode *i = page->mapping->host;
489 struct buffer_head *bh;
494 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
496 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
500 hpfs_unlock(i->i_sb);
501 SetPageUptodate(page);
507 hpfs_unlock(i->i_sb);
514 const struct address_space_operations hpfs_symlink_aops = {
515 .readpage = hpfs_symlink_readpage
518 static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
519 struct inode *new_dir, struct dentry *new_dentry)
521 const unsigned char *old_name = old_dentry->d_name.name;
522 unsigned old_len = old_dentry->d_name.len;
523 const unsigned char *new_name = new_dentry->d_name.name;
524 unsigned new_len = new_dentry->d_name.len;
525 struct inode *i = old_dentry->d_inode;
526 struct inode *new_inode = new_dentry->d_inode;
527 struct quad_buffer_head qbh, qbh1;
528 struct hpfs_dirent *dep, *nde;
529 struct hpfs_dirent de;
532 struct buffer_head *bh;
536 if ((err = hpfs_chk_name(new_name, &new_len))) return err;
538 hpfs_adjust_length(old_name, &old_len);
541 /* order doesn't matter, due to VFS exclusion */
543 /* Erm? Moving over the empty non-busy directory is perfectly legal */
544 if (new_inode && S_ISDIR(new_inode->i_mode)) {
549 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
550 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed");
555 de.hidden = new_name[0] == '.';
559 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) {
560 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) {
561 clear_nlink(new_inode);
563 memcpy(nde->name, new_name, new_len);
564 hpfs_mark_4buffers_dirty(&qbh1);
568 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent");
572 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0;
576 if (new_dir == old_dir) hpfs_brelse4(&qbh);
578 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) {
579 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!");
580 err = r == 1 ? -ENOSPC : -EFSERROR;
581 if (new_dir != old_dir) hpfs_brelse4(&qbh);
585 if (new_dir == old_dir)
586 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) {
587 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2");
592 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) {
593 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent");
594 err = r == 2 ? -ENOSPC : -EFSERROR;
599 hpfs_i(i)->i_parent_dir = new_dir->i_ino;
600 if (S_ISDIR(i->i_mode)) {
604 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) {
605 fnode->up = cpu_to_le32(new_dir->i_ino);
606 fnode->len = new_len;
607 memcpy(fnode->name, new_name, new_len>15?15:new_len);
608 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len);
609 mark_buffer_dirty(bh);
613 hpfs_unlock(i->i_sb);
617 const struct inode_operations hpfs_dir_iops =
619 .create = hpfs_create,
620 .lookup = hpfs_lookup,
621 .unlink = hpfs_unlink,
622 .symlink = hpfs_symlink,
626 .rename = hpfs_rename,
627 .setattr = hpfs_setattr,