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ext4: replace open coded nofail allocation in ext4_free_blocks()
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ext4_free_blocks is looping around the allocation request and mimics
__GFP_NOFAIL behavior without any allocation fallback strategy. Let's
remove the open coded loop and replace it with __GFP_NOFAIL. Without the
flag the allocator has no way to find out never-fail requirement and
cannot help in any way.

Signed-off-by: Michal Hocko <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]
Michal Hocko authored and tytso committed Jul 5, 2015
1 parent 8974fec commit 7444a07
Showing 1 changed file with 5 additions and 11 deletions.
16 changes: 5 additions & 11 deletions fs/ext4/mballoc.c
Original file line number Diff line number Diff line change
@@ -4815,18 +4815,12 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
/*
* blocks being freed are metadata. these blocks shouldn't
* be used until this transaction is committed
*
* We use __GFP_NOFAIL because ext4_free_blocks() is not allowed
* to fail.
*/
retry:
new_entry = kmem_cache_alloc(ext4_free_data_cachep, GFP_NOFS);
if (!new_entry) {
/*
* We use a retry loop because
* ext4_free_blocks() is not allowed to fail.
*/
cond_resched();
congestion_wait(BLK_RW_ASYNC, HZ/50);
goto retry;
}
new_entry = kmem_cache_alloc(ext4_free_data_cachep,
GFP_NOFS|__GFP_NOFAIL);
new_entry->efd_start_cluster = bit;
new_entry->efd_group = block_group;
new_entry->efd_count = count_clusters;

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