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