linux-kernel - [PATCH AUTOSEL for 4.4 092/162] Btrfs: always account pinned bytes when dropping a tree block ref

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Date:   Mon, 9 Apr 2018 00:28:51 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Omar Sandoval <osandov@...com>, David Sterba <dsterba@...e.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 092/162] Btrfs: always account pinned bytes
 when dropping a tree block ref

From: Omar Sandoval <osandov@...com>

[ Upstream commit 0a16c7d7aecfae8987197e50116ebfc338cbe0a2 ]

Currently, we only increment total_bytes_pinned in
btrfs_free_tree_block() when dropping the last reference on the block.
However, when the delayed ref is run later, we will decrement
total_bytes_pinned regardless of whether it was the last reference or
not. This causes the counter to underflow when the reference we dropped
was not the last reference. Fix it by incrementing the counter
unconditionally, which is what btrfs_free_extent() does. This makes
total_bytes_pinned an overestimate when references to shared extents are
dropped, but in the worst case this will just make us try to commit the
transaction to try to free up space and find we didn't free enough.

Signed-off-by: Omar Sandoval <osandov@...com>
Tested-by: Holger Hoffstätte <holger@...lied-asynchrony.com>
Reviewed-by: Liu Bo <bo.li.liu@...cle.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/btrfs/extent-tree.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 875e179bb2d5..2d59b3927223 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6770,10 +6770,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 		BUG_ON(ret); /* -ENOMEM */
 	}
 
-	if (!last_ref)
-		return;
-
-	if (btrfs_header_generation(buf) == trans->transid) {
+	if (last_ref && btrfs_header_generation(buf) == trans->transid) {
 		struct btrfs_block_group_cache *cache;
 
 		if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
@@ -6804,11 +6801,13 @@ out:
 				 btrfs_header_level(buf),
 				 root->root_key.objectid);
 
-	/*
-	 * Deleting the buffer, clear the corrupt flag since it doesn't matter
-	 * anymore.
-	 */
-	clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags);
+	if (last_ref) {
+		/*
+		 * Deleting the buffer, clear the corrupt flag since it doesn't
+		 * matter anymore.
+		 */
+		clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags);
+	}
 }
 
 /* Can return -ENOMEM */
-- 
2.15.1