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Message-Id: <1362579435-6333-4-git-send-email-wenqing.lz@taobao.com> Date: Wed, 6 Mar 2013 22:17:13 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: linux-ext4@...r.kernel.org Cc: Zheng Liu <wenqing.lz@...bao.com>, "Theodore Ts'o" <tytso@....edu>, Dmitry Monakhov <dmonakhov@...nvz.org> Subject: [PATCH v2 3/5] ext4: fix wrong m_len value after unwritten extent conversion From: Zheng Liu <wenqing.lz@...bao.com> We always assume that the return value of ext4_ext_map_blocks is equal to map->m_len but when we try to convert an unwritten extent 'm_len' value will break this assumption. It is harmless until we use status tree as a extent cache because we need to update status tree according to 'm_len' value. Meanwhile this commit marks EXT4_MAP_MAPPED flag after unwritten extent conversion. It shouldn't cause a bug because we update status tree according to checking EXT4_MAP_UNWRITTEN flag. But it should be fixed. After applied this commit, the following error message from self-testing infrastructure disappears. ... kernel: ES len assertation failed for inode: 230 retval 1 != map->m_len 3 in ext4_map_blocks (allocation) ... Signed-off-by: Zheng Liu <wenqing.lz@...bao.com> Cc: "Theodore Ts'o" <tytso@....edu> Cc: Dmitry Monakhov <dmonakhov@...nvz.org> --- fs/ext4/extents.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 25c86aa..110e85a 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3650,6 +3650,10 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, path, map->m_len); } else err = ret; + map->m_flags |= EXT4_MAP_MAPPED; + if (allocated > map->m_len) + allocated = map->m_len; + map->m_len = allocated; goto out2; } /* buffered IO case */ -- 1.7.12.rc2.18.g61b472e -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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