4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
8 * This file contains hfs_read_super(), some of the super_ops and
9 * init_module() and cleanup_module(). The remaining super_ops are in
10 * inode.c since they deal with inodes.
12 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/blkdev.h>
18 #include <linux/mount.h>
19 #include <linux/init.h>
20 #include <linux/parser.h>
21 #include <linux/seq_file.h>
22 #include <linux/vfs.h>
27 static kmem_cache_t *hfs_inode_cachep;
29 MODULE_LICENSE("GPL");
35 * This function is called by the VFS only. When the filesystem
36 * is mounted r/w it updates the MDB on disk.
38 * struct super_block *sb: Pointer to the hfs superblock
44 * 'sb' points to a "valid" (struct super_block).
46 * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
47 * (hfs_put_super() must set this flag!). Some MDB fields are updated
48 * and the MDB buffer is written to disk by calling hfs_mdb_commit().
50 static void hfs_write_super(struct super_block *sb)
53 if (sb->s_flags & MS_RDONLY)
55 /* sync everything to the buffers */
62 * This is the put_super() entry in the super_operations structure for
63 * HFS filesystems. The purpose is to release the resources
64 * associated with the superblock sb.
66 static void hfs_put_super(struct super_block *sb)
69 /* release the MDB's resources */
76 * This is the statfs() entry in the super_operations structure for
77 * HFS filesystems. The purpose is to return various data about the
80 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
82 static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
84 buf->f_type = HFS_SUPER_MAGIC;
85 buf->f_bsize = sb->s_blocksize;
86 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
87 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
88 buf->f_bavail = buf->f_bfree;
89 buf->f_files = HFS_SB(sb)->fs_ablocks;
90 buf->f_ffree = HFS_SB(sb)->free_ablocks;
91 buf->f_namelen = HFS_NAMELEN;
96 static int hfs_remount(struct super_block *sb, int *flags, char *data)
98 *flags |= MS_NODIRATIME;
99 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
101 if (!(*flags & MS_RDONLY)) {
102 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
103 printk("HFS-fs warning: Filesystem was not cleanly unmounted, "
104 "running fsck.hfs is recommended. leaving read-only.\n");
105 sb->s_flags |= MS_RDONLY;
107 } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
108 printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n");
109 sb->s_flags |= MS_RDONLY;
116 static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
118 struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
120 if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
121 seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
122 if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
123 seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
124 seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
125 if (sbi->s_file_umask != 0133)
126 seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
127 if (sbi->s_dir_umask != 0022)
128 seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
130 seq_printf(seq, ",part=%u", sbi->part);
131 if (sbi->session >= 0)
132 seq_printf(seq, ",session=%u", sbi->session);
134 seq_printf(seq, ",quiet");
138 static struct inode *hfs_alloc_inode(struct super_block *sb)
140 struct hfs_inode_info *i;
142 i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
143 return i ? &i->vfs_inode : NULL;
146 static void hfs_destroy_inode(struct inode *inode)
148 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
151 static struct super_operations hfs_super_operations = {
152 .alloc_inode = hfs_alloc_inode,
153 .destroy_inode = hfs_destroy_inode,
154 .write_inode = hfs_write_inode,
155 .clear_inode = hfs_clear_inode,
156 .put_super = hfs_put_super,
157 .write_super = hfs_write_super,
158 .statfs = hfs_statfs,
159 .remount_fs = hfs_remount,
160 .show_options = hfs_show_options,
164 opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
165 opt_part, opt_session, opt_type, opt_creator, opt_quiet,
169 static match_table_t tokens = {
170 { opt_uid, "uid=%u" },
171 { opt_gid, "gid=%u" },
172 { opt_umask, "umask=%o" },
173 { opt_file_umask, "file_umask=%o" },
174 { opt_dir_umask, "dir_umask=%o" },
175 { opt_part, "part=%u" },
176 { opt_session, "session=%u" },
177 { opt_type, "type=%s" },
178 { opt_creator, "creator=%s" },
179 { opt_quiet, "quiet" },
183 static inline int match_fourchar(substring_t *arg, u32 *result)
185 if (arg->to - arg->from != 4)
187 memcpy(result, arg->from, 4);
194 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
195 * This function is called by hfs_read_super() to parse the mount options.
197 static int parse_options(char *options, struct hfs_sb_info *hsb)
200 substring_t args[MAX_OPT_ARGS];
203 /* initialize the sb with defaults */
204 hsb->s_uid = current->uid;
205 hsb->s_gid = current->gid;
206 hsb->s_file_umask = 0133;
207 hsb->s_dir_umask = 0022;
208 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
216 while ((p = strsep(&options, ",")) != NULL) {
220 token = match_token(p, tokens, args);
223 if (match_int(&args[0], &tmp)) {
224 printk("HFS: uid requires an argument\n");
227 hsb->s_uid = (uid_t)tmp;
230 if (match_int(&args[0], &tmp)) {
231 printk("HFS: gid requires an argument\n");
234 hsb->s_gid = (gid_t)tmp;
237 if (match_octal(&args[0], &tmp)) {
238 printk("HFS: umask requires a value\n");
241 hsb->s_file_umask = (umode_t)tmp;
242 hsb->s_dir_umask = (umode_t)tmp;
245 if (match_octal(&args[0], &tmp)) {
246 printk("HFS: file_umask requires a value\n");
249 hsb->s_file_umask = (umode_t)tmp;
252 if (match_octal(&args[0], &tmp)) {
253 printk("HFS: dir_umask requires a value\n");
256 hsb->s_dir_umask = (umode_t)tmp;
259 if (match_int(&args[0], &hsb->part)) {
260 printk("HFS: part requires an argument\n");
265 if (match_int(&args[0], &hsb->session)) {
266 printk("HFS: session requires an argument\n");
271 if (match_fourchar(&args[0], &hsb->s_type)) {
272 printk("HFS+-fs: type requires a 4 character value\n");
277 if (match_fourchar(&args[0], &hsb->s_creator)) {
278 printk("HFS+-fs: creator requires a 4 character value\n");
290 hsb->s_dir_umask &= 0777;
291 hsb->s_file_umask &= 0577;
299 * This is the function that is responsible for mounting an HFS
300 * filesystem. It performs all the tasks necessary to get enough data
301 * from the disk to read the root inode. This includes parsing the
302 * mount options, dealing with Macintosh partitions, reading the
303 * superblock and the allocation bitmap blocks, calling
304 * hfs_btree_init() to get the necessary data about the extents and
305 * catalog B-trees and, finally, reading the root inode into memory.
307 static int hfs_fill_super(struct super_block *sb, void *data, int silent)
309 struct hfs_sb_info *sbi;
310 struct hfs_find_data fd;
312 struct inode *root_inode;
315 sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
319 memset(sbi, 0, sizeof(struct hfs_sb_info));
320 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
323 if (!parse_options((char *)data, sbi)) {
324 hfs_warn("hfs_fs: unable to parse mount options.\n");
328 sb->s_op = &hfs_super_operations;
329 sb->s_flags |= MS_NODIRATIME;
330 init_MUTEX(&sbi->bitmap_lock);
332 res = hfs_mdb_get(sb);
335 hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
341 /* try to get the root inode */
342 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
343 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
345 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
350 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
355 sb->s_root = d_alloc_root(root_inode);
359 sb->s_root->d_op = &hfs_dentry_operations;
361 /* everything's okay */
367 hfs_warn("hfs_fs: get root inode failed.\n");
373 static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
374 int flags, const char *dev_name, void *data)
376 return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
379 static struct file_system_type hfs_fs_type = {
380 .owner = THIS_MODULE,
382 .get_sb = hfs_get_sb,
383 .kill_sb = kill_block_super,
384 .fs_flags = FS_REQUIRES_DEV,
387 static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
389 struct hfs_inode_info *i = p;
391 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
392 inode_init_once(&i->vfs_inode);
395 static int __init init_hfs_fs(void)
399 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
400 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
401 hfs_init_once, NULL);
402 if (!hfs_inode_cachep)
404 err = register_filesystem(&hfs_fs_type);
406 kmem_cache_destroy(hfs_inode_cachep);
410 static void __exit exit_hfs_fs(void)
412 unregister_filesystem(&hfs_fs_type);
413 if (kmem_cache_destroy(hfs_inode_cachep))
414 printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
417 module_init(init_hfs_fs)
418 module_exit(exit_hfs_fs)