ext4: Fix fallocate error path From: "Aneesh Kumar K.V" Put the old extent details back if we fail to split the uninitialized extent. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Mingming Cao Signed-off-by: "Theodore Ts'o" --- fs/ext4/extents.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) Index: linux-2.6.25-rc3/fs/ext4/extents.c =================================================================== --- linux-2.6.25-rc3.orig/fs/ext4/extents.c 2008-03-04 11:51:38.000000000 -0800 +++ linux-2.6.25-rc3/fs/ext4/extents.c 2008-03-04 11:52:46.000000000 -0800 @@ -2152,7 +2152,7 @@ static int ext4_ext_convert_to_initializ 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; @@ -2171,6 +2171,9 @@ static int ext4_ext_convert_to_initializ 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) @@ -2199,13 +2202,25 @@ static int ext4_ext_convert_to_initializ 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); @@ -2280,6 +2295,13 @@ static int ext4_ext_convert_to_initializ 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; }