Messages in this thread Patch in this message | | | From | Valerie Aurora <> | Subject | [PATCH 25/34] union-mount: Implement union mount | Date | Thu, 16 Sep 2010 15:12:16 -0700 |
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Up till this commit, mount with MS_UNION flag succeeded but didn't actually union the file systems. Now call the functions to check the source mounts and create/destroy the per-vfsmount union structures.
Signed-off-by: Valerie Aurora <vaurora@redhat.com> --- fs/namespace.c | 13 ++++++++++++- fs/super.c | 1 + 2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c index e3629dd..6bbeb49 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1632,9 +1632,17 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt, if (err) goto out; } + + /* parent_path means we are moving an existing unioned mount */ + if (!parent_path && IS_MNT_UNION(source_mnt)) { + err = prepare_mnt_union(source_mnt, path); + if (err) + goto out_cleanup_ids; + } + err = propagate_mnt(dest_mnt, dest_dentry, source_mnt, &tree_list); if (err) - goto out_cleanup_ids; + goto out_cleanup_union; spin_lock(&vfsmount_lock); @@ -1658,6 +1666,9 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt, spin_unlock(&vfsmount_lock); return 0; + out_cleanup_union: + if (!parent_path && IS_MNT_UNION(source_mnt)) + cleanup_mnt_union(source_mnt); out_cleanup_ids: if (IS_MNT_SHARED(dest_mnt)) cleanup_group_ids(source_mnt, NULL); diff --git a/fs/super.c b/fs/super.c index 3f2df09..c376147 100644 --- a/fs/super.c +++ b/fs/super.c @@ -160,6 +160,7 @@ void deactivate_locked_super(struct super_block *s) if (atomic_dec_and_test(&s->s_active)) { fs->kill_sb(s); put_filesystem(fs); + put_union_sb(s); put_super(s); } else { up_write(&s->s_umount); -- 1.6.3.3
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