From c21c839b8448dd4b1e37ffc1bde928f57d34c0db Mon Sep 17 00:00:00 2001 From: Chengguang Xu Date: Fri, 24 Apr 2020 10:55:17 +0800 Subject: ovl: whiteout inode sharing Share inode with different whiteout files for saving inode and speeding up delete operation. If EMLINK is encountered when linking a shared whiteout, create a new one. In case of any other error, disable sharing for this super block. Note: ofs->whiteout is protected by inode lock on workdir. Signed-off-by: Chengguang Xu Reviewed-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/ovl_entry.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/overlayfs/ovl_entry.h') diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h index 5762d802fe01..a8f82fb7ffb4 100644 --- a/fs/overlayfs/ovl_entry.h +++ b/fs/overlayfs/ovl_entry.h @@ -68,6 +68,7 @@ struct ovl_fs { /* Did we take the inuse lock? */ bool upperdir_locked; bool workdir_locked; + bool share_whiteout; /* Traps in ovl inode cache */ struct inode *upperdir_trap; struct inode *workbasedir_trap; @@ -77,6 +78,8 @@ struct ovl_fs { int xino_mode; /* For allocation of non-persistent inode numbers */ atomic_long_t last_ino; + /* Whiteout dentry cache */ + struct dentry *whiteout; }; static inline struct ovl_fs *OVL_FS(struct super_block *sb) -- cgit v1.2.3