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authorZheng Liu <wenqing.lz@taobao.com>2013-03-10 21:20:23 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-28 12:12:18 -0700
commitd24f1399d1a527ba8c08df5f5ac96b9bd3c0e1d1 (patch)
treede24ce49f49d251852ae7deeeaa02090bc97a89f
parentac4f52e0fff3a2b5523655250cc2e7d77ba8c09b (diff)
ext4: fix the wrong number of the allocated blocks in ext4_split_extent()
commit 3a2256702e47f68f921dfad41b1764d05c572329 upstream. This commit fixes a wrong return value of the number of the allocated blocks in ext4_split_extent. When the length of blocks we want to allocate is greater than the length of the current extent, we return a wrong number. Let's see what happens in the following case when we call ext4_split_extent(). map: [48, 72] ex: [32, 64, u] 'ex' will be split into two parts: ex1: [32, 47, u] ex2: [48, 64, w] 'map->m_len' is returned from this function, and the value is 24. But the real length is 16. So it should be fixed. Meanwhile in this commit we use right length of the allocated blocks when get_reserved_cluster_alloc in ext4_ext_handle_uninitialized_extents is called. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/ext4/extents.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 852d4c257ace..0efff1e2c50f 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2959,6 +2959,7 @@ static int ext4_split_extent(handle_t *handle,
int err = 0;
int uninitialized;
int split_flag1, flags1;
+ int allocated = map->m_len;
depth = ext_depth(inode);
ex = path[depth].p_ext;
@@ -2978,6 +2979,8 @@ static int ext4_split_extent(handle_t *handle,
map->m_lblk + map->m_len, split_flag1, flags1);
if (err)
goto out;
+ } else {
+ allocated = ee_len - (map->m_lblk - ee_block);
}
ext4_ext_drop_refs(path);
@@ -3000,7 +3003,7 @@ static int ext4_split_extent(handle_t *handle,
ext4_ext_show_leaf(inode, path);
out:
- return err ? err : map->m_len;
+ return err ? err : allocated;
}
#define EXT4_EXT_ZERO_LEN 7
@@ -3668,6 +3671,7 @@ out:
allocated - map->m_len);
allocated = map->m_len;
}
+ map->m_len = allocated;
/*
* If we have done fallocate with the offset that is already