From: Daniel Rosenberg <drosen@google.com>
Date: Tue, 10 Jul 2018 03:32:42 +0000 (-0700)
Subject: f2fs: Keep alloc_valid_block_count in sync
X-Git-Tag: v4.18.9~80
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14580e8d96554438df8ee00bed0e58a06da76033;p=thirdparty%2Fkernel%2Fstable.git

f2fs: Keep alloc_valid_block_count in sync

[ Upstream commit 36b877af7992893b6d1ddbe96971cab5ab9e50eb ]

If we attempt to request more blocks than we have room for, we try to
instead request as much as we can, however, alloc_valid_block_count
is not decremented to match the new value, allowing it to drift higher
until the next checkpoint. This always decrements it when the requested
amount cannot be fulfilled.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 34af21f46f2cc..03c07721da49d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1680,18 +1680,20 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
 		sbi->total_valid_block_count -= diff;
 		if (!*count) {
 			spin_unlock(&sbi->stat_lock);
-			percpu_counter_sub(&sbi->alloc_valid_block_count, diff);
 			goto enospc;
 		}
 	}
 	spin_unlock(&sbi->stat_lock);
 
-	if (unlikely(release))
+	if (unlikely(release)) {
+		percpu_counter_sub(&sbi->alloc_valid_block_count, release);
 		dquot_release_reservation_block(inode, release);
+	}
 	f2fs_i_blocks_write(inode, *count, true, true);
 	return 0;
 
 enospc:
+	percpu_counter_sub(&sbi->alloc_valid_block_count, release);
 	dquot_release_reservation_block(inode, release);
 	return -ENOSPC;
 }