diff options
Diffstat (limited to 'fs/sysv/super.c')
-rw-r--r-- | fs/sysv/super.c | 91 |
1 files changed, 59 insertions, 32 deletions
diff --git a/fs/sysv/super.c b/fs/sysv/super.c index 5a903da54551..3d9c62be0c10 100644 --- a/fs/sysv/super.c +++ b/fs/sysv/super.c @@ -347,7 +347,6 @@ static int complete_read_super(struct super_block *sb, int silent, int size) sb->s_flags |= MS_RDONLY; if (sbi->s_truncate) sb->s_root->d_op = &sysv_dentry_operations; - sb->s_dirt = 1; return 1; } @@ -435,12 +434,46 @@ Ebadsize: goto failed; } -static int v7_fill_super(struct super_block *sb, void *data, int silent) +static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh) { - struct sysv_sb_info *sbi; - struct buffer_head *bh, *bh2 = NULL; struct v7_super_block *v7sb; struct sysv_inode *v7i; + struct buffer_head *bh2; + struct sysv_sb_info *sbi; + + sbi = sb->s_fs_info; + + /* plausibility check on superblock */ + v7sb = (struct v7_super_block *) bh->b_data; + if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE || + fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD || + fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE) + return 0; + + /* plausibility check on root inode: it is a directory, + with a nonzero size that is a multiple of 16 */ + bh2 = sb_bread(sb, 2); + if (bh2 == NULL) + return 0; + + v7i = (struct sysv_inode *)(bh2->b_data + 64); + if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR || + (fs32_to_cpu(sbi, v7i->i_size) == 0) || + (fs32_to_cpu(sbi, v7i->i_size) & 017) || + (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES * + sizeof(struct sysv_dir_entry))) { + brelse(bh2); + return 0; + } + + brelse(bh2); + return 1; +} + +static int v7_fill_super(struct super_block *sb, void *data, int silent) +{ + struct sysv_sb_info *sbi; + struct buffer_head *bh; if (440 != sizeof (struct v7_super_block)) panic("V7 FS: bad super-block size"); @@ -454,7 +487,6 @@ static int v7_fill_super(struct super_block *sb, void *data, int silent) sbi->s_sb = sb; sbi->s_block_base = 0; sbi->s_type = FSTYPE_V7; - sbi->s_bytesex = BYTESEX_PDP; sb->s_fs_info = sbi; sb_set_blocksize(sb, 512); @@ -466,32 +498,27 @@ static int v7_fill_super(struct super_block *sb, void *data, int silent) goto failed; } - /* plausibility check on superblock */ - v7sb = (struct v7_super_block *) bh->b_data; - if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE || - fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD || - fs32_to_cpu(sbi, v7sb->s_time) == 0) - goto failed; + /* Try PDP-11 UNIX */ + sbi->s_bytesex = BYTESEX_PDP; + if (v7_sanity_check(sb, bh)) + goto detected; - /* plausibility check on root inode: it is a directory, - with a nonzero size that is a multiple of 16 */ - if ((bh2 = sb_bread(sb, 2)) == NULL) - goto failed; - v7i = (struct sysv_inode *)(bh2->b_data + 64); - if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR || - (fs32_to_cpu(sbi, v7i->i_size) == 0) || - (fs32_to_cpu(sbi, v7i->i_size) & 017) != 0) - goto failed; - brelse(bh2); - bh2 = NULL; + /* Try PC/IX, v7/x86 */ + sbi->s_bytesex = BYTESEX_LE; + if (v7_sanity_check(sb, bh)) + goto detected; + goto failed; + +detected: sbi->s_bh1 = bh; sbi->s_bh2 = bh; if (complete_read_super(sb, silent, 1)) return 0; failed: - brelse(bh2); + printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n", + sb->s_id); brelse(bh); kfree(sbi); return -EINVAL; @@ -499,23 +526,22 @@ failed: /* Every kernel module contains stuff like this. */ -static int sysv_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data, struct vfsmount *mnt) +static struct dentry *sysv_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) { - return get_sb_bdev(fs_type, flags, dev_name, data, sysv_fill_super, - mnt); + return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super); } -static int v7_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data, struct vfsmount *mnt) +static struct dentry *v7_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) { - return get_sb_bdev(fs_type, flags, dev_name, data, v7_fill_super, mnt); + return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super); } static struct file_system_type sysv_fs_type = { .owner = THIS_MODULE, .name = "sysv", - .get_sb = sysv_get_sb, + .mount = sysv_mount, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; @@ -523,7 +549,7 @@ static struct file_system_type sysv_fs_type = { static struct file_system_type v7_fs_type = { .owner = THIS_MODULE, .name = "v7", - .get_sb = v7_get_sb, + .mount = v7_mount, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; @@ -560,4 +586,5 @@ static void __exit exit_sysv_fs(void) module_init(init_sysv_fs) module_exit(exit_sysv_fs) +MODULE_ALIAS("v7"); MODULE_LICENSE("GPL"); |