1 files changed, 395 insertions, 0 deletions

diff --git a/fs/hfs/super.c b/fs/hfs/super.c
new file mode 100644
index 000000000000..1e2c193134cc
--- /dev/null
+++ b/fs/hfs/super.c
@@ -0,0 +1,395 @@
+/*
+ *  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)