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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2008-04-17 10:38:59 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-04-17 10:38:59 -0400
commit95c3889cb88ca4833096553c12cde9e7eb792f4c (patch)
treecb18bbe779ffef21695a068f8ed49d4dad48d428
parentf3f12faa7414595f502721c90c34deccc1a03c71 (diff)
ext4: Fix fallocate error path
Put the old extent details back if we fail to split the uninitialized extent. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/ext4/extents.c26
1 files changed, 24 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 9ae6e67090c..a38f3242782 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2154,7 +2154,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
ext4_lblk_t iblock,
unsigned long max_blocks)
{
- struct ext4_extent *ex, newex;
+ struct ext4_extent *ex, newex, orig_ex;
struct ext4_extent *ex1 = NULL;
struct ext4_extent *ex2 = NULL;
struct ext4_extent *ex3 = NULL;
@@ -2173,6 +2173,9 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
allocated = ee_len - (iblock - ee_block);
newblock = iblock - ee_block + ext_pblock(ex);
ex2 = ex;
+ orig_ex.ee_block = ex->ee_block;
+ orig_ex.ee_len = cpu_to_le16(ee_len);
+ ext4_ext_store_pblock(&orig_ex, ext_pblock(ex));
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
@@ -2201,13 +2204,25 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
ex3->ee_len = cpu_to_le16(allocated - max_blocks);
ext4_ext_mark_uninitialized(ex3);
err = ext4_ext_insert_extent(handle, inode, path, ex3);
- if (err)
+ if (err) {
+ ex->ee_block = orig_ex.ee_block;
+ ex->ee_len = orig_ex.ee_len;
+ ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
+ ext4_ext_mark_uninitialized(ex);
+ ext4_ext_dirty(handle, inode, path + depth);
goto out;
+ }
/*
* The depth, and hence eh & ex might change
* as part of the insert above.
*/
newdepth = ext_depth(inode);
+ /*
+ * update the extent length after successfull insert of the
+ * split extent
+ */
+ orig_ex.ee_len = cpu_to_le16(ee_len -
+ ext4_ext_get_actual_len(ex3));
if (newdepth != depth) {
depth = newdepth;
ext4_ext_drop_refs(path);
@@ -2282,6 +2297,13 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
goto out;
insert:
err = ext4_ext_insert_extent(handle, inode, path, &newex);
+ if (err) {
+ ex->ee_block = orig_ex.ee_block;
+ ex->ee_len = orig_ex.ee_len;
+ ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
+ ext4_ext_mark_uninitialized(ex);
+ ext4_ext_dirty(handle, inode, path + depth);
+ }
out:
return err ? err : allocated;
}