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xfs: conditionally allow FS_XFLAG_REALTIME changes if S_DAX is set

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commit 8d16762047c627073955b7ed171a36addaf7b1ff upstream.

If a file has the S_DAX flag (aka fsdax access mode) set, we cannot
allow users to change the realtime flag unless the datadev and rtdev
both support fsdax access modes.  Even if there are no extents allocated
to the file, the setattr thread could be racing with another thread
that has already started down the write code paths.

Fixes: ba23cba9b3 ("fs: allow per-device dax status checking for filesystems")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Darrick J. Wong
2024-12-18 11:17:21 -08:00
committed by Greg Kroah-Hartman
parent b2dcbd8a92
commit 4a82db7a4b
1 changed files with 11 additions and 0 deletions
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11
fs/xfs/xfs_ioctl.c
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@@ -1128,6 +1128,17 @@ xfs_ioctl_setattr_xflags(
/* Can't change realtime flag if any extents are allocated. */
if (ip->i_df.if_nextents || ip->i_delayed_blks)
return -EINVAL;
/*
* If S_DAX is enabled on this file, we can only switch the
* device if both support fsdax. We can't update S_DAX because
* there might be other threads walking down the access paths.
*/
if (IS_DAX(VFS_I(ip)) &&
(mp->m_ddev_targp->bt_daxdev == NULL ||
(mp->m_rtdev_targp &&
mp->m_rtdev_targp->bt_daxdev == NULL)))
return -EINVAL;
}
if (rtflag) {