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/init.h>
19 #include <linux/vfs.h>
24 const char hfs_version[]="0.96";
26 static kmem_cache_t *hfs_inode_cachep;
28 MODULE_LICENSE("GPL");
34 * This function is called by the VFS only. When the filesystem
35 * is mounted r/w it updates the MDB on disk.
37 * struct super_block *sb: Pointer to the hfs superblock
43 * 'sb' points to a "valid" (struct super_block).
45 * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
46 * (hfs_put_super() must set this flag!). Some MDB fields are updated
47 * and the MDB buffer is written to disk by calling hfs_mdb_commit().
49 static void hfs_write_super(struct super_block *sb)
52 if (sb->s_flags & MS_RDONLY)
54 /* sync everything to the buffers */
61 * This is the put_super() entry in the super_operations structure for
62 * HFS filesystems. The purpose is to release the resources
63 * associated with the superblock sb.
65 static void hfs_put_super(struct super_block *sb)
68 /* release the MDB's resources */
75 * This is the statfs() entry in the super_operations structure for
76 * HFS filesystems. The purpose is to return various data about the
79 * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
81 static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
83 buf->f_type = HFS_SUPER_MAGIC;
84 buf->f_bsize = sb->s_blocksize;
85 buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
86 buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
87 buf->f_bavail = buf->f_bfree;
88 buf->f_files = HFS_SB(sb)->fs_ablocks;
89 buf->f_ffree = HFS_SB(sb)->free_ablocks;
90 buf->f_namelen = HFS_NAMELEN;
95 int hfs_remount(struct super_block *sb, int *flags, char *data)
97 *flags |= MS_NODIRATIME;
98 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
100 if (!(*flags & MS_RDONLY)) {
101 if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))
102 || (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_INCNSTNT))) {
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 struct inode *hfs_alloc_inode(struct super_block *sb)
118 struct hfs_inode_info *i;
120 i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
121 return i ? &i->vfs_inode : NULL;
124 static void hfs_destroy_inode(struct inode *inode)
126 kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
129 static struct super_operations hfs_super_operations = {
130 .alloc_inode = hfs_alloc_inode,
131 .destroy_inode = hfs_destroy_inode,
132 .write_inode = hfs_write_inode,
133 .clear_inode = hfs_clear_inode,
134 .put_super = hfs_put_super,
135 .write_super = hfs_write_super,
136 .statfs = hfs_statfs,
137 .remount_fs = hfs_remount,
143 * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
144 * This function is called by hfs_read_super() to parse the mount options.
146 static int parse_options(char *options, struct hfs_sb_info *hsb)
148 char *this_char, *value;
150 /* initialize the sb with defaults */
151 hsb->s_uid = current->uid;
152 hsb->s_gid = current->gid;
153 hsb->s_file_umask = 0644;
154 hsb->s_dir_umask = 0755;
155 hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
163 while ((this_char = strsep(&options, ",")) != 0) {
166 value = strchr(this_char, '=');
170 /* Numeric-valued options */
171 if (!strcmp(this_char, "uid")) {
172 if (!value || !*value)
174 hsb->s_uid = simple_strtoul(value, &value, 0);
177 } else if (!strcmp(this_char, "gid")) {
178 if (!value || !*value)
180 hsb->s_gid = simple_strtoul(value, &value, 0);
183 } else if (!strcmp(this_char, "umask")) {
184 if (!value || !*value)
186 hsb->s_file_umask = simple_strtoul(value, &value, 8);
187 hsb->s_dir_umask = hsb->s_file_umask;
190 } else if (!strcmp(this_char, "file_umask")) {
191 if (!value || !*value)
193 hsb->s_file_umask = simple_strtoul(value, &value, 8);
196 } else if (!strcmp(this_char, "dir_umask")) {
197 if (!value || !*value)
199 hsb->s_dir_umask = simple_strtoul(value, &value, 8);
202 } else if (!strcmp(this_char, "part")) {
203 if (!value || !*value)
205 hsb->part = simple_strtoul(value, &value, 0);
208 } else if (!strcmp(this_char, "session")) {
209 if (!value || !*value)
211 hsb->session = simple_strtoul(value, &value, 0);
214 /* String-valued options */
215 } else if (!strcmp(this_char, "type") && value) {
216 if (strlen(value) != 4)
218 memcpy(&hsb->s_type, value, 4);
219 } else if (!strcmp(this_char, "creator") && value) {
220 if (strlen(value) != 4)
222 memcpy(&hsb->s_creator, value, 4);
223 /* Boolean-valued options */
224 } else if (!strcmp(this_char, "quiet")) {
232 hsb->s_dir_umask &= 0777;
233 hsb->s_file_umask &= 0777;
241 * This is the function that is responsible for mounting an HFS
242 * filesystem. It performs all the tasks necessary to get enough data
243 * from the disk to read the root inode. This includes parsing the
244 * mount options, dealing with Macintosh partitions, reading the
245 * superblock and the allocation bitmap blocks, calling
246 * hfs_btree_init() to get the necessary data about the extents and
247 * catalog B-trees and, finally, reading the root inode into memory.
249 static int hfs_fill_super(struct super_block *sb, void *data, int silent)
251 struct hfs_sb_info *sbi;
252 struct hfs_find_data fd;
254 struct inode *root_inode;
257 sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
261 memset(sbi, 0, sizeof(struct hfs_sb_info));
262 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
265 if (!parse_options((char *)data, sbi)) {
266 hfs_warn("hfs_fs: unable to parse mount options.\n");
270 sb->s_op = &hfs_super_operations;
271 sb->s_flags |= MS_NODIRATIME;
272 init_MUTEX(&sbi->bitmap_lock);
274 res = hfs_mdb_get(sb);
277 hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
283 /* try to get the root inode */
284 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
285 res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
287 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
292 root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
297 sb->s_root = d_alloc_root(root_inode);
301 sb->s_root->d_op = &hfs_dentry_operations;
303 /* everything's okay */
309 hfs_warn("hfs_fs: get root inode failed.\n");
317 static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *data)
320 return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
323 static struct file_system_type hfs_fs_type = {
324 .owner = THIS_MODULE,
326 .get_sb = hfs_get_sb,
327 .kill_sb = kill_block_super,
328 .fs_flags = FS_REQUIRES_DEV,
331 static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
333 struct hfs_inode_info *i = p;
335 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
336 inode_init_once(&i->vfs_inode);
339 static int __init init_hfs_fs(void)
343 hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
344 sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
345 hfs_init_once, NULL);
346 if (!hfs_inode_cachep)
348 err = register_filesystem(&hfs_fs_type);
350 kmem_cache_destroy(hfs_inode_cachep);
354 static void __exit exit_hfs_fs(void)
356 unregister_filesystem(&hfs_fs_type);
357 if (kmem_cache_destroy(hfs_inode_cachep))
358 printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
361 module_init(init_hfs_fs)
362 module_exit(exit_hfs_fs)