From 02bcd1577400b0b2eab806ccb9f72d6b5ec7bcca Mon Sep 17 00:00:00 2001 From: Amir Goldstein Date: Wed, 21 Jun 2017 15:28:36 +0300 Subject: ovl: introduce the inodes index dir feature Create the index dir on mount. The index dir will contain hardlinks to upper inodes, named after the hex representation of their origin lower inodes. The index dir is going to be used to prevent breaking lower hardlinks on copy up and to implement overlayfs NFS export. Because the feature is not fully backward compat, enabling the feature is opt-in by config/module/mount option. Signed-off-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/util.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'fs/overlayfs/util.c') diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index adccd74162d6..90b50b8e75ab 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -12,6 +12,8 @@ #include #include #include +#include +#include #include "overlayfs.h" #include "ovl_entry.h" @@ -47,6 +49,19 @@ struct super_block *ovl_same_sb(struct super_block *sb) return ofs->same_sb; } +bool ovl_can_decode_fh(struct super_block *sb) +{ + return (sb->s_export_op && sb->s_export_op->fh_to_dentry && + !uuid_is_null(&sb->s_uuid)); +} + +struct dentry *ovl_indexdir(struct super_block *sb) +{ + struct ovl_fs *ofs = sb->s_fs_info; + + return ofs->indexdir; +} + struct ovl_entry *ovl_alloc_entry(unsigned int numlower) { size_t size = offsetof(struct ovl_entry, lowerstack[numlower]); -- cgit v1.2.3