From 63b999685cb372e24eb73f255cd73547026370fd Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Tue, 16 Jul 2013 10:28:47 -0400 Subject: [PATCH] ext4: call ext4_es_lru_add() after handling cache miss If there are no items in the extent status tree, ext4_es_lru_add() is a no-op. So it is not sufficient to call ext4_es_lru_add() before we try to lookup an entry in the extent status tree. We also need to call it at the end of ext4_ext_map_blocks(), after items have been added to the extent status tree. This could lead to inodes with that have extent status trees but which are not in the LRU list, which means they won't get considered for eviction by the es_shrinker. Signed-off-by: "Theodore Ts'o" Cc: Zheng Liu Cc: stable@vger.kernel.org --- fs/ext4/extents.c | 5 +++-- fs/ext4/inode.c | 7 ++----- 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index cfdc51e..a618738 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4385,8 +4385,9 @@ out2: } out3: - trace_ext4_ext_map_blocks_exit(inode, flags, map, err ? err : allocated); - + trace_ext4_ext_map_blocks_exit(inode, flags, map, + err ? err : allocated); + ext4_es_lru_add(inode); return err ? err : allocated; } diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 98b9bff..ba33c67 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -514,10 +514,9 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, "logical block %lu\n", inode->i_ino, flags, map->m_len, (unsigned long) map->m_lblk); - ext4_es_lru_add(inode); - /* Lookup extent status tree firstly */ if (ext4_es_lookup_extent(inode, map->m_lblk, &es)) { + ext4_es_lru_add(inode); if (ext4_es_is_written(&es) || ext4_es_is_unwritten(&es)) { map->m_pblk = ext4_es_pblock(&es) + map->m_lblk - es.es_lblk; @@ -1529,11 +1528,9 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, "logical block %lu\n", inode->i_ino, map->m_len, (unsigned long) map->m_lblk); - ext4_es_lru_add(inode); - /* Lookup extent status tree firstly */ if (ext4_es_lookup_extent(inode, iblock, &es)) { - + ext4_es_lru_add(inode); if (ext4_es_is_hole(&es)) { retval = 0; down_read((&EXT4_I(inode)->i_data_sem)); -- 2.7.4