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| author | Amir Goldstein <amir73il@gmail.com> | 2017-06-21 15:28:36 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-07-04 22:03:17 +0200 |
| commit | 02bcd1577400b0b2eab806ccb9f72d6b5ec7bcca (patch) | |
| tree | 92c54e46aa6ae552eefac194f25d7faccdd00d5c /fs/overlayfs/copy_up.c | |
| parent | 6b8aa129dcbe0e9825109b35c4b967f984e8fb13 (diff) | |
| download | linux-02bcd1577400b0b2eab806ccb9f72d6b5ec7bcca.tar.bz2 | |
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 <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.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 87289b9a152c..f9f51cce3c18 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -233,12 +233,13 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat) return err; } -static struct ovl_fh *ovl_encode_fh(struct dentry *lower, uuid_t *uuid) +static struct ovl_fh *ovl_encode_fh(struct dentry *lower) { struct ovl_fh *fh; int fh_type, fh_len, dwords; void *buf; int buflen = MAX_HANDLE_SZ; + uuid_t *uuid = &lower->d_sb->s_uuid; buf = kmalloc(buflen, GFP_TEMPORARY); if (!buf) @@ -283,7 +284,6 @@ out: static int ovl_set_origin(struct dentry *dentry, struct dentry *lower, struct dentry *upper) { - struct super_block *sb = lower->d_sb; const struct ovl_fh *fh = NULL; int err; @@ -292,9 +292,8 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower, * so we can use the overlay.origin xattr to distignuish between a copy * up and a pure upper inode. */ - if (sb->s_export_op && sb->s_export_op->fh_to_dentry && - !uuid_is_null(&sb->s_uuid)) { - fh = ovl_encode_fh(lower, &sb->s_uuid); + if (ovl_can_decode_fh(lower->d_sb)) { + fh = ovl_encode_fh(lower); if (IS_ERR(fh)) return PTR_ERR(fh); } |