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
Subject: [PATCH V4 06/10] xfs: Check for extent overflow when writing to unwritten extent
Date: Fri, 18 Sep 2020 15:17:55 +0530 [thread overview]
Message-ID: <20200918094759.2727564-7-chandanrlinux@gmail.com> (raw)
In-Reply-To: <20200918094759.2727564-1-chandanrlinux@gmail.com>
A write to a sub-interval of an existing unwritten extent causes
the original extent to be split into 3 extents
i.e. | Unwritten | Real | Unwritten |
Hence extent count can increase by 2.
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
fs/xfs/libxfs/xfs_inode_fork.h | 8 ++++++++
fs/xfs/xfs_iomap.c | 5 +++++
2 files changed, 13 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index fd93fdc67ee4..afb647e1e3fa 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -70,6 +70,14 @@ struct xfs_ifork {
#define XFS_IEXT_DIR_MANIP_CNT(mp) \
((XFS_DA_NODE_MAXDEPTH + 1 + 1) * (mp)->m_dir_geo->fsbcount)
+/*
+ * A write to a sub-interval of an existing unwritten extent causes the original
+ * extent to be split into 3 extents
+ * i.e. | Unwritten | Real | Unwritten |
+ * Hence extent count can increase by 2.
+ */
+#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
+
/*
* Fork handling.
*/
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index a302a96823b8..2aa788379611 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -566,6 +566,11 @@ xfs_iomap_write_unwritten(
if (error)
goto error_on_bmapi_transaction;
+ error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
+ XFS_IEXT_WRITE_UNWRITTEN_CNT);
+ if (error)
+ goto error_on_bmapi_transaction;
+
/*
* Modify the unwritten extent state of the buffer.
*/
--
2.28.0
next prev parent reply other threads:[~2020-09-18 9:48 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 9:47 [PATCH V4 00/10] Bail out if transaction can cause extent count to overflow Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 01/10] xfs: Add helper for checking per-inode extent count overflow Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 02/10] xfs: Check for extent overflow when trivally adding a new extent Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 03/10] xfs: Check for extent overflow when punching a hole Chandan Babu R
2020-09-18 15:54 ` Darrick J. Wong
2020-09-19 9:42 ` Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 04/10] xfs: Check for extent overflow when adding/removing xattrs Chandan Babu R
2020-09-18 15:49 ` Darrick J. Wong
2020-09-18 9:47 ` [PATCH V4 05/10] xfs: Check for extent overflow when adding/removing dir entries Chandan Babu R
2020-09-18 9:47 ` Chandan Babu R [this message]
2020-09-18 9:47 ` [PATCH V4 07/10] xfs: Check for extent overflow when moving extent from cow to data fork Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 08/10] xfs: Check for extent overflow when remapping an extent Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 09/10] xfs: Check for extent overflow when swapping extents Chandan Babu R
2020-09-18 15:44 ` Darrick J. Wong
2020-09-19 9:44 ` Chandan Babu R
2020-09-18 9:47 ` [PATCH V4 10/10] xfs: Introduce error injection to reduce maximum inode fork extent count Chandan Babu R
2020-09-18 15:39 ` Darrick J. Wong
2020-09-19 9:45 ` Chandan Babu R
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