This patch makes the following changes:
* Rename ext4_mb_pa_free to ext4_mb_pa_put_free
to better reflect its purpose
* Add new ext4_mb_pa_free() which only handles freeing
* Refactor ext4_mb_pa_callback() to use ext4_mb_pa_free()
There are no functional changes in this patch
Signed-off-by: Ojaswin Mujoo <[email protected]>
Reviewed-by: Ritesh Harjani (IBM) <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
---
fs/ext4/mballoc.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6fbddabab64f..45cb92510e5c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4530,16 +4530,22 @@ static void ext4_mb_mark_pa_deleted(struct super_block *sb,
}
}
-static void ext4_mb_pa_callback(struct rcu_head *head)
+static inline void ext4_mb_pa_free(struct ext4_prealloc_space *pa)
{
- struct ext4_prealloc_space *pa;
- pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu);
-
+ BUG_ON(!pa);
BUG_ON(atomic_read(&pa->pa_count));
BUG_ON(pa->pa_deleted == 0);
kmem_cache_free(ext4_pspace_cachep, pa);
}
+static void ext4_mb_pa_callback(struct rcu_head *head)
+{
+ struct ext4_prealloc_space *pa;
+
+ pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu);
+ ext4_mb_pa_free(pa);
+}
+
/*
* drops a reference to preallocated space descriptor
* if this was the last reference and the space is consumed
@@ -5066,14 +5072,20 @@ static int ext4_mb_pa_alloc(struct ext4_allocation_context *ac)
return 0;
}
-static void ext4_mb_pa_free(struct ext4_allocation_context *ac)
+static void ext4_mb_pa_put_free(struct ext4_allocation_context *ac)
{
struct ext4_prealloc_space *pa = ac->ac_pa;
BUG_ON(!pa);
ac->ac_pa = NULL;
WARN_ON(!atomic_dec_and_test(&pa->pa_count));
- kmem_cache_free(ext4_pspace_cachep, pa);
+ /*
+ * current function is only called due to an error or due to
+ * len of found blocks < len of requested blocks hence the PA has not
+ * been added to grp->bb_prealloc_list. So we don't need to lock it
+ */
+ pa->pa_deleted = 1;
+ ext4_mb_pa_free(pa);
}
#ifdef CONFIG_EXT4_DEBUG
@@ -5622,13 +5634,13 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* So we have to free this pa here itself.
*/
if (*errp) {
- ext4_mb_pa_free(ac);
+ ext4_mb_pa_put_free(ac);
ext4_discard_allocated_blocks(ac);
goto errout;
}
if (ac->ac_status == AC_STATUS_FOUND &&
ac->ac_o_ex.fe_len >= ac->ac_f_ex.fe_len)
- ext4_mb_pa_free(ac);
+ ext4_mb_pa_put_free(ac);
}
if (likely(ac->ac_status == AC_STATUS_FOUND)) {
*errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs);
@@ -5647,7 +5659,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* If block allocation fails then the pa allocated above
* needs to be freed here itself.
*/
- ext4_mb_pa_free(ac);
+ ext4_mb_pa_put_free(ac);
*errp = -ENOSPC;
}
--
2.31.1