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From: Chandan Babu R <chandanrlinux@gmail.com>
To: linux-xfs@vger.kernel.org
Cc: Chandan Babu R <chandanrlinux@gmail.com>,
	darrick.wong@oracle.com, hch@lst.de,
	allison.henderson@oracle.com
Subject: [PATCH V12 07/14] xfs: Check for extent overflow when moving extent from cow to data fork
Date: Mon,  4 Jan 2021 16:01:13 +0530	[thread overview]
Message-ID: <20210104103120.41158-8-chandanrlinux@gmail.com> (raw)
In-Reply-To: <20210104103120.41158-1-chandanrlinux@gmail.com>

Moving an extent to data fork can cause a sub-interval of an existing
extent to be unmapped. This will increase extent count by 1. Mapping in
the new extent can increase the extent count by 1 again i.e.
 | Old extent | New extent | Old extent |
Hence number of extents increases by 2.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 fs/xfs/libxfs/xfs_inode_fork.h | 9 +++++++++
 fs/xfs/xfs_reflink.c           | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index 917e289ad962..c8f279edc5c1 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -79,6 +79,15 @@ struct xfs_ifork {
 #define XFS_IEXT_WRITE_UNWRITTEN_CNT	(2)
 
 
+/*
+ * Moving an extent to data fork can cause a sub-interval of an existing extent
+ * to be unmapped. This will increase extent count by 1. Mapping in the new
+ * extent can increase the extent count by 1 again i.e.
+ * | Old extent | New extent | Old extent |
+ * Hence number of extents increases by 2.
+ */
+#define XFS_IEXT_REFLINK_END_COW_CNT	(2)
+
 /*
  * Fork handling.
  */
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 6fa05fb78189..ca0ac1426d74 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -628,6 +628,11 @@ xfs_reflink_end_cow_extent(
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	xfs_trans_ijoin(tp, ip, 0);
 
+	error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
+			XFS_IEXT_REFLINK_END_COW_CNT);
+	if (error)
+		goto out_cancel;
+
 	/*
 	 * In case of racing, overlapping AIO writes no COW extents might be
 	 * left by the time I/O completes for the loser of the race.  In that
-- 
2.29.2


  parent reply	other threads:[~2021-01-04 10:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-04 10:31 [PATCH V12 00/14] Bail out if transaction can cause extent count to overflow Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 01/14] xfs: Add helper for checking per-inode extent count overflow Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 02/14] xfs: Check for extent overflow when trivally adding a new extent Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 03/14] xfs: Check for extent overflow when punching a hole Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 04/14] xfs: Check for extent overflow when adding/removing dir entries Chandan Babu R
2021-01-08  1:17   ` Darrick J. Wong
2021-01-08  4:55     ` Chandan Babu R
2021-01-09  1:33       ` Darrick J. Wong
2021-01-09  5:26         ` Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 05/14] xfs: Check for extent overflow when adding/removing xattrs Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 06/14] xfs: Check for extent overflow when writing to unwritten extent Chandan Babu R
2021-01-04 10:31 ` Chandan Babu R [this message]
2021-01-04 10:31 ` [PATCH V12 08/14] xfs: Check for extent overflow when remapping an extent Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 09/14] xfs: Check for extent overflow when swapping extents Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 10/14] xfs: Introduce error injection to reduce maximum inode fork extent count Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 11/14] xfs: Remove duplicate assert statement in xfs_bmap_btalloc() Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 12/14] xfs: Compute bmap extent alignments in a separate function Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 13/14] xfs: Process allocated extent " Chandan Babu R
2021-01-04 10:31 ` [PATCH V12 14/14] xfs: Introduce error injection to allocate only minlen size extents for files Chandan Babu R

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