Commit 7c9950fd authored by Dave Chinner's avatar Dave Chinner Committed by Ben Myers

xfs: disable swap extents ioctl on CRC enabled filesystems

Currently, swapping extents from one inode to another is a simple
act of switching data and attribute forks from one inode to another.
This, unfortunately in no longer so simple with CRC enabled
filesystems as there is owner information embedded into the BMBT
blocks that are swapped between inodes. Hence swapping the forks
between inodes results in the inodes having mapping blocks that
point to the wrong owner and hence are considered corrupt.

To fix this we need an extent tree block or record based swap
algorithm so that the BMBT block owner information can be updated
atomically in the swap transaction. This is a significant piece of
new work, so for the moment simply don't allow swap extent
operations to succeed on CRC enabled filesystems.
Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarBen Myers <bpm@sgi.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>

(cherry picked from commit 02f75405)
parent e7927e87
...@@ -219,6 +219,14 @@ xfs_swap_extents( ...@@ -219,6 +219,14 @@ xfs_swap_extents(
int taforkblks = 0; int taforkblks = 0;
__uint64_t tmp; __uint64_t tmp;
/*
* We have no way of updating owner information in the BMBT blocks for
* each inode on CRC enabled filesystems, so to avoid corrupting the
* this metadata we simply don't allow extent swaps to occur.
*/
if (xfs_sb_version_hascrc(&mp->m_sb))
return XFS_ERROR(EINVAL);
tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
if (!tempifp) { if (!tempifp) {
error = XFS_ERROR(ENOMEM); error = XFS_ERROR(ENOMEM);
......
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