Commit 796ff095 authored Sep 24, 2022 by Darrick J. Wong Committed by Greg Kroah-Hartman Sep 28, 2022

xfs: attach dquots and reserve quota blocks during unwritten conversion



commit 2815a16d7ff6230a8e37928829d221bb075aa160 upstream.

In xfs_iomap_write_unwritten, we need to ensure that dquots are attached
to the inode and quota blocks reserved so that we capture in the quota
counters any blocks allocated to handle a bmbt split.  This can happen
on the first unwritten extent conversion to a preallocated sparse file
on a fresh mount.

This was found by running generic/311 with quotas enabled.  The bug
seems to have been introduced in "[XFS] rework iocore infrastructure,
remove some code and make it more" from ~2002?

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a33bcad4

fs/xfs/xfs_iomap.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -765,6 +765,11 @@ xfs_iomap_write_unwritten(
		*/
		resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;

		/* Attach dquots so that bmbt splits are accounted correctly. */
		error = xfs_qm_dqattach(ip);
		if (error)
		return error;

		do {
		/*
		* Set up a transaction to convert the range of extents
		@@ -783,6 +788,11 @@ xfs_iomap_write_unwritten(
		xfs_ilock(ip, XFS_ILOCK_EXCL);
		xfs_trans_ijoin(tp, ip, 0);

		error = xfs_trans_reserve_quota_nblks(tp, ip, resblks, 0,
		XFS_QMOPT_RES_REGBLKS);
		if (error)
		goto error_on_bmapi_transaction;

		/*
		* Modify the unwritten extent state of the buffer.
		*/