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xfs: reject swapext ioctl on swapfiles 

Swapfiles are magic - I/O is directly initialized by the VM without
involving the filesystem.  Swapping out extents underneath the VM thus
can cause severe problems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Christoph Hellwig 2009-02-12 19:56:00 +01:00 committed by Christoph Hellwig
parent 264307520b
commit 7c8f7af67d
1 changed files with 6 additions and 0 deletions
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6
fs/xfs/xfs_dfrag.c
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@ -79,6 +79,12 @@ xfs_swapext(
goto out_put_target_file;
}
if (IS_SWAPFILE(file->f_path.dentry->d_inode) ||
IS_SWAPFILE(target_file->f_path.dentry->d_inode)) {
error = XFS_ERROR(EINVAL);
goto out_put_target_file;
}
ip = XFS_I(file->f_path.dentry->d_inode);
tip = XFS_I(target_file->f_path.dentry->d_inode);