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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>
This commit is contained in:
Aneesh Kumar K.V 2009-06-10 14:22:55 -04:00 committed by Theodore Ts'o
parent 0eab928221
commit a41f207169
1 changed files with 6 additions and 2 deletions
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8
fs/ext4/extents.c
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@ -2083,12 +2083,16 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
ex = EXT_LAST_EXTENT(eh); ex = EXT_LAST_EXTENT(eh);
ex_ee_block = le32_to_cpu(ex->ee_block); 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); ex_ee_len = ext4_ext_get_actual_len(ex);
while (ex >= EXT_FIRST_EXTENT(eh) && while (ex >= EXT_FIRST_EXTENT(eh) &&
ex_ee_block + ex_ee_len > start) { 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); ext_debug("remove ext %lu:%u\n", ex_ee_block, ex_ee_len);
path[depth].p_ext = ex; path[depth].p_ext = ex;