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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>
This commit is contained in:
Aneesh Kumar K.V 2008-04-17 10:38:59 -04:00 committed by Theodore Ts'o
parent f3f12faa74
commit 95c3889cb8
1 changed files with 24 additions and 2 deletions
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26
fs/ext4/extents.c
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@ -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;
}