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authorChengguang Xu <cgxu519@mykernel.net>2020-04-24 10:55:17 +0800
committerMiklos Szeredi <mszeredi@redhat.com>2020-05-13 11:11:24 +0200
commitc21c839b8448dd4b1e37ffc1bde928f57d34c0db (patch)
tree72887c93eebea1c78fbd61d032cbc06191d082f4 /fs/overlayfs/super.c
parent654255fa205cb2b010e9abb34b0c8afcca9c78c7 (diff)
downloadlinux-c21c839b8448dd4b1e37ffc1bde928f57d34c0db.tar.bz2
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 <cgxu519@mykernel.net> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/super.c')
-rw-r--r--fs/overlayfs/super.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index af69f41f564d..a88a7badf444 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -217,6 +217,7 @@ static void ovl_free_fs(struct ovl_fs *ofs)
iput(ofs->indexdir_trap);
iput(ofs->workdir_trap);
iput(ofs->upperdir_trap);
+ dput(ofs->whiteout);
dput(ofs->indexdir);
dput(ofs->workdir);
if (ofs->workdir_locked)
@@ -1776,6 +1777,9 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
if (!cred)
goto out_err;
+ /* Is there a reason anyone would want not to share whiteouts? */
+ ofs->share_whiteout = true;
+
ofs->config.index = ovl_index_def;
ofs->config.nfs_export = ovl_nfs_export_def;
ofs->config.xino = ovl_xino_def();