From: Chandan Babu R <chandanrlinux@gmail.com>
To: linux-xfs@vger.kernel.org
Cc: Chandan Babu R <chandanrlinux@gmail.com>,
darrick.wong@oracle.com, david@fromorbit.com, hch@infradead.org,
allison.henderson@oracle.com
Subject: [PATCH V9 09/14] xfs: Check for extent overflow when swapping extents
Date: Mon, 2 Nov 2020 15:20:43 +0530 [thread overview]
Message-ID: <20201102095048.100956-10-chandanrlinux@gmail.com> (raw)
In-Reply-To: <20201102095048.100956-1-chandanrlinux@gmail.com>
Removing an initial range of source/donor file's extent and adding a new
extent (from donor/source file) in its place will cause extent count to
increase by 1.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
fs/xfs/libxfs/xfs_inode_fork.h | 7 +++++++
fs/xfs/xfs_bmap_util.c | 16 ++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index b99e67e7b59b..969b06160d44 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -87,6 +87,13 @@ struct xfs_ifork {
*/
#define XFS_IEXT_REFLINK_END_COW_CNT (2)
+/*
+ * Removing an initial range of source/donor file's extent and adding a new
+ * extent (from donor/source file) in its place will cause extent count to
+ * increase by 1.
+ */
+#define XFS_IEXT_SWAP_RMAP_CNT (1)
+
/*
* Fork handling.
*/
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 0776abd0103c..b6728fdf50ae 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1407,6 +1407,22 @@ xfs_swap_extent_rmap(
irec.br_blockcount);
trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec);
+ if (xfs_bmap_is_real_extent(&uirec)) {
+ error = xfs_iext_count_may_overflow(ip,
+ XFS_DATA_FORK,
+ XFS_IEXT_SWAP_RMAP_CNT);
+ if (error)
+ goto out;
+ }
+
+ if (xfs_bmap_is_real_extent(&irec)) {
+ error = xfs_iext_count_may_overflow(tip,
+ XFS_DATA_FORK,
+ XFS_IEXT_SWAP_RMAP_CNT);
+ if (error)
+ goto out;
+ }
+
/* Remove the mapping from the donor file. */
xfs_bmap_unmap_extent(tp, tip, &uirec);
--
2.28.0
next prev parent reply other threads:[~2020-11-02 9:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 9:50 [PATCH V9 00/14] Bail out if transaction can cause extent count to overflow Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 01/14] xfs: Add helper for checking per-inode extent count overflow Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 02/14] xfs: Check for extent overflow when trivally adding a new extent Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 03/14] xfs: Check for extent overflow when punching a hole Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 04/14] xfs: Check for extent overflow when adding/removing xattrs Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 05/14] xfs: Check for extent overflow when adding/removing dir entries Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 06/14] xfs: Check for extent overflow when writing to unwritten extent Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 07/14] xfs: Check for extent overflow when moving extent from cow to data fork Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 08/14] xfs: Check for extent overflow when remapping an extent Chandan Babu R
2020-11-02 9:50 ` Chandan Babu R [this message]
2020-11-02 9:50 ` [PATCH V9 10/14] xfs: Introduce error injection to reduce maximum inode fork extent count Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 11/14] xfs: Remove duplicate assert statement in xfs_bmap_btalloc() Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 12/14] xfs: Compute bmap extent alignments in a separate function Chandan Babu R
2020-11-02 17:05 ` Darrick J. Wong
2020-11-03 3:56 ` Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 13/14] xfs: Process allocated extent " Chandan Babu R
2020-11-02 9:50 ` [PATCH V9 14/14] xfs: Introduce error injection to allocate only minlen size extents for files Chandan Babu R
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