[PATCH 2/2] ext4: set EXT4_STATE_NO_EXPAND in ext4_evict_inode

[Yun Zhou <yun.zhou@windriver.com>]

An inode being evicted will never need its extra isize expanded.  Set
EXT4_STATE_NO_EXPAND before ext4_mark_inode_dirty() in ext4_evict_inode()
to make this explicit and prevent any unnecessary work in
ext4_try_to_expand_extra_isize().

This also provides defense-in-depth for the s_writepages_rwsem deadlock
during mount-time orphan cleanup, ensuring the expand path is blocked
for inodes under eviction regardless of how they are reached.

Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a5409324d965..0d131371ad3d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -264,6 +264,7 @@ void ext4_evict_inode(struct inode *inode)
 	if (ext4_inode_is_fast_symlink(inode))
 		memset(EXT4_I(inode)->i_data, 0, sizeof(EXT4_I(inode)->i_data));
 	inode->i_size = 0;
+	ext4_set_inode_state(inode, EXT4_STATE_NO_EXPAND);
 	err = ext4_mark_inode_dirty(handle, inode);
 	if (err) {
 		ext4_warning(inode->i_sb,
-- 
2.43.0