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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2009-06-10 14:22:55 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-06-10 14:22:55 -0400
commita41f20716975910d9beb90b7efc61107901492b8 (patch)
tree99d3987296660884b998be4d2308d38ca84670a6
parent0eab928221bac8895a0b494a16a8810002bd8645 (diff)
ext4: Avoid corrupting the uninitialized bit in the extent during truncate
The unitialized bit was not properly getting preserved in in an extent which is partially truncated because the it was geting set to the value of the first extent to be removed or truncated as part of the truncate operation, and if there are multiple extents are getting removed or modified as part of the truncate operation, it is only the last extent which will might be partially truncated, and its uninitalized bit is not necessarily the same as the first extent to be truncated. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/ext4/extents.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 9c35a7b1f0a..2593f748c3a 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2083,12 +2083,16 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
ex = EXT_LAST_EXTENT(eh);
ex_ee_block = le32_to_cpu(ex->ee_block);
- if (ext4_ext_is_uninitialized(ex))
- uninitialized = 1;
ex_ee_len = ext4_ext_get_actual_len(ex);
while (ex >= EXT_FIRST_EXTENT(eh) &&
ex_ee_block + ex_ee_len > start) {
+
+ if (ext4_ext_is_uninitialized(ex))
+ uninitialized = 1;
+ else
+ uninitialized = 0;
+
ext_debug("remove ext %lu:%u\n", ex_ee_block, ex_ee_len);
path[depth].p_ext = ex;