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| 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/namespace.c | |
| parent | 390c684367de37e1c2f9005cf92f7a746c69fdd3 (diff) | |
| download | lwn-07b20889e3052c7e77d6a6a54e7e83446eb1ba84.tar.gz lwn-07b20889e3052c7e77d6a6a54e7e83446eb1ba84.zip | |
[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/namespace.c')
| -rw-r--r-- | fs/namespace.c | 24 |
1 files changed, 24 insertions, 0 deletions
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 |