> Can you name it as discard allocated blocks and add a comment saying why
> we don't need it for MB_GROUP_PA ? Otherwise
>
> Acked-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
This fixes a leak of blocks in an inode prealloc list if device failures
cause ext4_mb_mark_diskspace_used() to fail.
Signed-off-by: Curt Wohlgemuth <curtw@xxxxxxxxxx>
---
diff -uprN orig/fs/ext4/mballoc.c new/fs/ext4/mballoc.c
--- orig/fs/ext4/mballoc.c 2009-12-01 09:27:25.000000000 -0800
+++ new/fs/ext4/mballoc.c 2009-12-04 11:09:03.000000000 -0800
@@ -3011,6 +3011,24 @@ static void ext4_mb_collect_stats(struct
}
/*
+ * Called on failure; free up any blocks from the inode PA for this
+ * context. We don't need this for MB_GROUP_PA because we only change
+ * pa_free in ext4_mb_release_context(), but on failure, we've already
+ * zeroed out ac->ac_b_ex.fe_len, so group_pa->pa_free is not changed.
+ */
+static void ext4_discard_allocated_blocks(struct ext4_allocation_context *ac)
+{
+ struct ext4_prealloc_space *pa = ac->ac_pa;
+ int len;
+
+ if (pa && pa->pa_type == MB_INODE_PA) {
+ len = ac->ac_b_ex.fe_len;
+ pa->pa_free += len;
+ }
+
+}
+
+/*
* use blocks preallocated to inode
*/
static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
@@ -4295,6 +4313,7 @@ repeat:
ac->ac_status = AC_STATUS_CONTINUE;
goto repeat;
} else if (*errp) {
+ ext4_discard_allocated_blocks(ac);
ac->ac_b_ex.fe_len = 0;
ar->len = 0;
ext4_mb_show_ac(ac);
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