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Btrfs: remove BUG_ON()s in btrfs_ioctl_setflags() 

We can recover from errors and return -errno to user space.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan 2011-12-29 13:36:45 +08:00
parent 706efc6630
commit f062abf089
1 changed files with 14 additions and 4 deletions
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18
fs/btrfs/ioctl.c
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@ -176,6 +176,8 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
struct btrfs_trans_handle *trans;
unsigned int flags, oldflags;
int ret;
u64 ip_oldflags;
unsigned int i_oldflags;
if (btrfs_root_readonly(root))
return -EROFS;
@ -192,6 +194,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
mutex_lock(&inode->i_mutex);
ip_oldflags = ip->flags;
i_oldflags = inode->i_flags;
flags = btrfs_mask_flags(inode->i_mode, flags);
oldflags = btrfs_flags_to_ioctl(ip->flags);
if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
@ -250,18 +255,23 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
}
trans = btrfs_join_transaction(root);
BUG_ON(IS_ERR(trans));
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_drop;
}
btrfs_update_iflags(inode);
inode->i_ctime = CURRENT_TIME;
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
btrfs_end_transaction(trans, root);
out_drop:
if (ret) {
ip->flags = ip_oldflags;
inode->i_flags = i_oldflags;
}
mnt_drop_write(file->f_path.mnt);
ret = 0;
out_unlock:
mutex_unlock(&inode->i_mutex);
return ret;