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ovl: mark upper merge dir with type origin entries "impure"

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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>
This commit is contained in:
Amir Goldstein
2017-05-24 15:29:33 +03:00
committed by Miklos Szeredi
parent ee1d6d37b6
commit f3a1568582
6 changed files with 60 additions and 58 deletions
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5
fs/overlayfs/super.c
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@@ -974,7 +974,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
path_put(&workpath);
kfree(lowertmp);
oe->__upperdentry = upperpath.dentry;
if (upperpath.dentry) {
oe->__upperdentry = upperpath.dentry;
oe->impure = ovl_is_impuredir(upperpath.dentry);
}
for (i = 0; i < numlower; i++) {
oe->lowerstack[i].dentry = stack[i].dentry;
oe->lowerstack[i].mnt = ufs->lower_mnt[i];