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-rw-r--r--fs/hfs/super.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
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+++ b/fs/hfs/super.c
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+/*
+ * linux/fs/hfs/super.c
+ *
+ * Copyright (C) 1995-1997 Paul H. Hargrove
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ * This file may be distributed under the terms of the GNU General Public License.
+ *
+ * This file contains hfs_read_super(), some of the super_ops and
+ * init_module() and cleanup_module(). The remaining super_ops are in
+ * inode.c since they deal with inodes.
+ *
+ * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+#include <linux/parser.h>
+#include <linux/vfs.h>
+
+#include "hfs_fs.h"
+#include "btree.h"
+
+static kmem_cache_t *hfs_inode_cachep;
+
+MODULE_LICENSE("GPL");
+
+/*
+ * hfs_write_super()
+ *
+ * Description:
+ * This function is called by the VFS only. When the filesystem
+ * is mounted r/w it updates the MDB on disk.
+ * Input Variable(s):
+ * struct super_block *sb: Pointer to the hfs superblock
+ * Output Variable(s):
+ * NONE
+ * Returns:
+ * void
+ * Preconditions:
+ * 'sb' points to a "valid" (struct super_block).
+ * Postconditions:
+ * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
+ * (hfs_put_super() must set this flag!). Some MDB fields are updated
+ * and the MDB buffer is written to disk by calling hfs_mdb_commit().
+ */
+static void hfs_write_super(struct super_block *sb)
+{
+ sb->s_dirt = 0;
+ if (sb->s_flags & MS_RDONLY)
+ return;
+ /* sync everything to the buffers */
+ hfs_mdb_commit(sb);
+}
+
+/*
+ * hfs_put_super()
+ *
+ * This is the put_super() entry in the super_operations structure for
+ * HFS filesystems. The purpose is to release the resources
+ * associated with the superblock sb.
+ */
+static void hfs_put_super(struct super_block *sb)
+{
+ hfs_mdb_close(sb);
+ /* release the MDB's resources */
+ hfs_mdb_put(sb);
+}
+
+/*
+ * hfs_statfs()
+ *
+ * This is the statfs() entry in the super_operations structure for
+ * HFS filesystems. The purpose is to return various data about the
+ * filesystem.
+ *
+ * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
+ */
+static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ buf->f_type = HFS_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
+ buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
+ buf->f_bavail = buf->f_bfree;
+ buf->f_files = HFS_SB(sb)->fs_ablocks;
+ buf->f_ffree = HFS_SB(sb)->free_ablocks;
+ buf->f_namelen = HFS_NAMELEN;
+
+ return 0;
+}
+
+static int hfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ *flags |= MS_NODIRATIME;
+ if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+ return 0;
+ if (!(*flags & MS_RDONLY)) {
+ if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
+ printk("HFS-fs warning: Filesystem was not cleanly unmounted, "
+ "running fsck.hfs is recommended. leaving read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ *flags |= MS_RDONLY;
+ } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
+ printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ *flags |= MS_RDONLY;
+ }
+ }
+ return 0;
+}
+
+static struct inode *hfs_alloc_inode(struct super_block *sb)
+{
+ struct hfs_inode_info *i;
+
+ i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL);
+ return i ? &i->vfs_inode : NULL;
+}
+
+static void hfs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
+}
+
+static struct super_operations hfs_super_operations = {
+ .alloc_inode = hfs_alloc_inode,
+ .destroy_inode = hfs_destroy_inode,
+ .write_inode = hfs_write_inode,
+ .clear_inode = hfs_clear_inode,
+ .put_super = hfs_put_super,
+ .write_super = hfs_write_super,
+ .statfs = hfs_statfs,
+ .remount_fs = hfs_remount,
+};
+
+enum {
+ opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
+ opt_part, opt_session, opt_type, opt_creator, opt_quiet,
+ opt_err
+};
+
+static match_table_t tokens = {
+ { opt_uid, "uid=%u" },
+ { opt_gid, "gid=%u" },
+ { opt_umask, "umask=%o" },
+ { opt_file_umask, "file_umask=%o" },
+ { opt_dir_umask, "dir_umask=%o" },
+ { opt_part, "part=%u" },
+ { opt_session, "session=%u" },
+ { opt_type, "type=%s" },
+ { opt_creator, "creator=%s" },
+ { opt_quiet, "quiet" },
+ { opt_err, NULL }
+};
+
+static inline int match_fourchar(substring_t *arg, u32 *result)
+{
+ if (arg->to - arg->from != 4)
+ return -EINVAL;
+ memcpy(result, arg->from, 4);
+ return 0;
+}
+
+/*
+ * parse_options()
+ *
+ * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
+ * This function is called by hfs_read_super() to parse the mount options.
+ */
+static int parse_options(char *options, struct hfs_sb_info *hsb)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int tmp, token;
+
+ /* initialize the sb with defaults */
+ hsb->s_uid = current->uid;
+ hsb->s_gid = current->gid;
+ hsb->s_file_umask = 0133;
+ hsb->s_dir_umask = 0022;
+ hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
+ hsb->s_quiet = 0;
+ hsb->part = -1;
+ hsb->session = -1;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case opt_uid:
+ if (match_int(&args[0], &tmp)) {
+ printk("HFS: uid requires an argument\n");
+ return 0;
+ }
+ hsb->s_uid = (uid_t)tmp;
+ break;
+ case opt_gid:
+ if (match_int(&args[0], &tmp)) {
+ printk("HFS: gid requires an argument\n");
+ return 0;
+ }
+ hsb->s_gid = (gid_t)tmp;
+ break;
+ case opt_umask:
+ if (match_octal(&args[0], &tmp)) {
+ printk("HFS: umask requires a value\n");
+ return 0;
+ }
+ hsb->s_file_umask = (umode_t)tmp;
+ hsb->s_dir_umask = (umode_t)tmp;
+ break;
+ case opt_file_umask:
+ if (match_octal(&args[0], &tmp)) {
+ printk("HFS: file_umask requires a value\n");
+ return 0;
+ }
+ hsb->s_file_umask = (umode_t)tmp;
+ break;
+ case opt_dir_umask:
+ if (match_octal(&args[0], &tmp)) {
+ printk("HFS: dir_umask requires a value\n");
+ return 0;
+ }
+ hsb->s_dir_umask = (umode_t)tmp;
+ break;
+ case opt_part:
+ if (match_int(&args[0], &hsb->part)) {
+ printk("HFS: part requires an argument\n");
+ return 0;
+ }
+ break;
+ case opt_session:
+ if (match_int(&args[0], &hsb->session)) {
+ printk("HFS: session requires an argument\n");
+ return 0;
+ }
+ break;
+ case opt_type:
+ if (match_fourchar(&args[0], &hsb->s_type)) {
+ printk("HFS+-fs: type requires a 4 character value\n");
+ return 0;
+ }
+ break;
+ case opt_creator:
+ if (match_fourchar(&args[0], &hsb->s_creator)) {
+ printk("HFS+-fs: creator requires a 4 character value\n");
+ return 0;
+ }
+ break;
+ case opt_quiet:
+ hsb->s_quiet = 1;
+ break;
+ default:
+ return 0;
+ }
+ }
+
+ hsb->s_dir_umask &= 0777;
+ hsb->s_file_umask &= 0577;
+
+ return 1;
+}
+
+/*
+ * hfs_read_super()
+ *
+ * This is the function that is responsible for mounting an HFS
+ * filesystem. It performs all the tasks necessary to get enough data
+ * from the disk to read the root inode. This includes parsing the
+ * mount options, dealing with Macintosh partitions, reading the
+ * superblock and the allocation bitmap blocks, calling
+ * hfs_btree_init() to get the necessary data about the extents and
+ * catalog B-trees and, finally, reading the root inode into memory.
+ */
+static int hfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct hfs_sb_info *sbi;
+ struct hfs_find_data fd;
+ hfs_cat_rec rec;
+ struct inode *root_inode;
+ int res;
+
+ sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ sb->s_fs_info = sbi;
+ memset(sbi, 0, sizeof(struct hfs_sb_info));
+ INIT_HLIST_HEAD(&sbi->rsrc_inodes);
+
+ res = -EINVAL;
+ if (!parse_options((char *)data, sbi)) {
+ hfs_warn("hfs_fs: unable to parse mount options.\n");
+ goto bail3;
+ }
+
+ sb->s_op = &hfs_super_operations;
+ sb->s_flags |= MS_NODIRATIME;
+ init_MUTEX(&sbi->bitmap_lock);
+
+ res = hfs_mdb_get(sb);
+ if (res) {
+ if (!silent)
+ hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n",
+ hfs_mdb_name(sb));
+ res = -EINVAL;
+ goto bail2;
+ }
+
+ /* try to get the root inode */
+ hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
+ res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
+ if (!res)
+ hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
+ if (res) {
+ hfs_find_exit(&fd);
+ goto bail_no_root;
+ }
+ root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
+ hfs_find_exit(&fd);
+ if (!root_inode)
+ goto bail_no_root;
+
+ sb->s_root = d_alloc_root(root_inode);
+ if (!sb->s_root)
+ goto bail_iput;
+
+ sb->s_root->d_op = &hfs_dentry_operations;
+
+ /* everything's okay */
+ return 0;
+
+bail_iput:
+ iput(root_inode);
+bail_no_root:
+ hfs_warn("hfs_fs: get root inode failed.\n");
+ hfs_mdb_put(sb);
+bail2:
+bail3:
+ kfree(sbi);
+ return res;
+}
+
+static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
+}
+
+static struct file_system_type hfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "hfs",
+ .get_sb = hfs_get_sb,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
+{
+ struct hfs_inode_info *i = p;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
+ inode_init_once(&i->vfs_inode);
+}
+
+static int __init init_hfs_fs(void)
+{
+ int err;
+
+ hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
+ sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
+ hfs_init_once, NULL);
+ if (!hfs_inode_cachep)
+ return -ENOMEM;
+ err = register_filesystem(&hfs_fs_type);
+ if (err)
+ kmem_cache_destroy(hfs_inode_cachep);
+ return err;
+}
+
+static void __exit exit_hfs_fs(void)
+{
+ unregister_filesystem(&hfs_fs_type);
+ if (kmem_cache_destroy(hfs_inode_cachep))
+ printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n");
+}
+
+module_init(init_hfs_fs)
+module_exit(exit_hfs_fs)
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