The patch below does not apply to the 3.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 63b999685cb372e24eb73f255cd73547026370fd Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
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" <tytso@xxxxxxx>
Cc: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index cfdc51e3..a6187380 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 98b9bff9..ba33c67d 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));
--
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