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, Christoph Hellwig <hch@lst.de>
Subject: [PATCH V9 06/14] xfs: Check for extent overflow when writing to unwritten extent
Date: Mon, 2 Nov 2020 15:20:40 +0530 [thread overview]
Message-ID: <20201102095048.100956-7-chandanrlinux@gmail.com> (raw)
In-Reply-To: <20201102095048.100956-1-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>
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 | 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:[~2020-11-02 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 ` Chandan Babu R [this message]
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 ` [PATCH V9 09/14] xfs: Check for extent overflow when swapping extents Chandan Babu R
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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