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xfs: xfs_iflush_cluster fails to abort on error 

When a failure due to an inode buffer occurs, the error handling
fails to abort the inode writeback correctly. This can result in the
inode being reclaimed whilst still in the AIL, leading to
use-after-free situations as well as filesystems that cannot be
unmounted as the inode log items left in the AIL never get removed.

Fix this by ensuring fatal errors from xfs_imap_to_bp() result in
the inode flush being aborted correctly.

cc: <stable@vger.kernel.org> # 3.10.x-
Reported-by: Shyam Kaushik <shyam@zadarastorage.com>
Diagnosed-by: Shyam Kaushik <shyam@zadarastorage.com>
Tested-by: Shyam Kaushik <shyam@zadarastorage.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2016-05-18 13:53:42 +10:00 committed by Dave Chinner
parent 8179c03629
commit b1438f4779
1 changed files with 13 additions and 4 deletions
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17
fs/xfs/xfs_inode.c
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@ -3327,7 +3327,7 @@ xfs_iflush(
struct xfs_buf **bpp)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_buf *bp;
struct xfs_buf *bp = NULL;
struct xfs_dinode *dip;
int error;
@ -3369,14 +3369,22 @@ xfs_iflush(
}
/*
* Get the buffer containing the on-disk inode.
* Get the buffer containing the on-disk inode. We are doing a try-lock
* operation here, so we may get an EAGAIN error. In that case, we
* simply want to return with the inode still dirty.
*
* If we get any other error, we effectively have a corruption situation
* and we cannot flush the inode, so we treat it the same as failing
* xfs_iflush_int().
*/
error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
0);
if (error || !bp) {
if (error == -EAGAIN) {
xfs_ifunlock(ip);
return error;
}
if (error)
goto corrupt_out;
/*
* First flush out the inode that xfs_iflush was called with.
@ -3404,7 +3412,8 @@ xfs_iflush(
return 0;
corrupt_out:
xfs_buf_relse(bp);
if (bp)
xfs_buf_relse(bp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
cluster_corrupt_out:
error = -EFSCORRUPTED;