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authorAmir Goldstein <amir73il@gmail.com>2017-05-24 15:29:33 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2017-05-29 11:48:00 +0200
commitf3a1568582cc207663a4d5e37da790334372855b (patch)
tree00f5b95a4ef417098629a7f16493beb194e5c60c /fs/overlayfs/copy_up.c
parentee1d6d37b6b884383b501089be93ce94f2153028 (diff)
downloadlinux-f3a1568582cc207663a4d5e37da790334372855b.tar.bz2
ovl: mark upper merge dir with type origin entries "impure"
An upper dir is marked "impure" to let ovl_iterate() know that this directory may contain non pure upper entries whose d_ino may need to be read from the origin inode. We already mark a non-merge dir "impure" when moving a non-pure child entry inside it, to let ovl_iterate() know not to iterate the non-merge dir directly. Mark also a merge dir "impure" when moving a non-pure child entry inside it and when copying up a child entry inside it. This can be used to optimize ovl_iterate() to perform a "pure merge" of upper and lower directories, merging the content of the directories, without having to read d_ino from origin inodes. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/copy_up.c')
-rw-r--r--fs/overlayfs/copy_up.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 843ed2a2d7db..7a44533f4bbf 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -459,6 +459,11 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
ovl_path_upper(parent, &parentpath);
upperdir = parentpath.dentry;
+ /* Mark parent "impure" because it may now contain non-pure upper */
+ err = ovl_set_impure(parent, upperdir);
+ if (err)
+ return err;
+
err = vfs_getattr(&parentpath, &pstat,
STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT);
if (err)