diff options
| author | Ram Pai <linuxram@us.ibm.com> | 2005-11-07 17:19:07 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-07 18:18:10 -0800 |
| commit | 07b20889e3052c7e77d6a6a54e7e83446eb1ba84 (patch) | |
| tree | 616ac5b7eef3092e105d3b41e7bd2052558b064b /fs | |
| parent | 390c684367de37e1c2f9005cf92f7a746c69fdd3 (diff) | |
[PATCH] beginning of the shared-subtree proper
A private mount does not forward or receive propagation. This patch
provides user the ability to convert any mount to private.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/Makefile | 2 | ||||
| -rw-r--r-- | fs/namespace.c | 24 | ||||
| -rw-r--r-- | fs/pnode.c | 17 | ||||
| -rw-r--r-- | fs/pnode.h | 14 |
4 files changed, 56 insertions, 1 deletions
diff --git a/fs/Makefile b/fs/Makefile index 1972da186272..4c2655759078 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -10,7 +10,7 @@ obj-y := open.o read_write.o file_table.o buffer.o bio.o super.o \ ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \ attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \ seq_file.o xattr.o libfs.o fs-writeback.o mpage.o direct-io.o \ - ioprio.o + ioprio.o pnode.o obj-$(CONFIG_INOTIFY) += inotify.o obj-$(CONFIG_EPOLL) += eventpoll.o diff --git a/fs/namespace.c b/fs/namespace.c index 4abee9ab009f..3782923d6d4d 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -24,6 +24,7 @@ #include <linux/mount.h> #include <asm/uaccess.h> #include <asm/unistd.h> +#include "pnode.h" extern int __init init_rootfs(void); @@ -663,6 +664,27 @@ out_unlock: } /* + * recursively change the type of the mountpoint. + */ +static int do_change_type(struct nameidata *nd, int flag) +{ + struct vfsmount *m, *mnt = nd->mnt; + int recurse = flag & MS_REC; + int type = flag & ~MS_REC; + + if (nd->dentry != nd->mnt->mnt_root) + return -EINVAL; + + down_write(&namespace_sem); + spin_lock(&vfsmount_lock); + for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL)) + change_mnt_propagation(m, type); + spin_unlock(&vfsmount_lock); + up_write(&namespace_sem); + return 0; +} + +/* * do loopback mount. */ static int do_loopback(struct nameidata *nd, char *old_name, int recurse) @@ -1091,6 +1113,8 @@ long do_mount(char *dev_name, char *dir_name, char *type_page, data_page); else if (flags & MS_BIND) retval = do_loopback(&nd, dev_name, flags & MS_REC); + else if (flags & MS_PRIVATE) + retval = do_change_type(&nd, flags); else if (flags & MS_MOVE) retval = do_move_mount(&nd, dev_name); else diff --git a/fs/pnode.c b/fs/pnode.c new file mode 100644 index 000000000000..aaa0dffda12a --- /dev/null +++ b/fs/pnode.c @@ -0,0 +1,17 @@ +/* + * linux/fs/pnode.c + * + * (C) Copyright IBM Corporation 2005. + * Released under GPL v2. + * Author : Ram Pai (linuxram@us.ibm.com) + * + */ +#include <linux/namespace.h> +#include <linux/mount.h> +#include <linux/fs.h> +#include "pnode.h" + +void change_mnt_propagation(struct vfsmount *mnt, int type) +{ + mnt->mnt_flags &= ~MNT_PNODE_MASK; +} diff --git a/fs/pnode.h b/fs/pnode.h new file mode 100644 index 000000000000..33549a3a74eb --- /dev/null +++ b/fs/pnode.h @@ -0,0 +1,14 @@ +/* + * linux/fs/pnode.h + * + * (C) Copyright IBM Corporation 2005. + * Released under GPL v2. + * + */ +#ifndef _LINUX_PNODE_H +#define _LINUX_PNODE_H + +#include <linux/list.h> +#include <linux/mount.h> +void change_mnt_propagation(struct vfsmount *, int); +#endif /* _LINUX_PNODE_H */ |