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author | Valerie Aurora <vaurora@redhat.com> | 2010-01-26 14:20:47 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-03-03 14:07:55 -0500 |
commit | 495d6c9c6595ec7b37910dfd42634839431d21fd (patch) | |
tree | 375a2ea9803a91c5df34df80d7e08119d9772240 /include/linux/mount.h | |
parent | 2ecdc82ef0b03e67ce5ecee79d0d108177a704df (diff) | |
download | blackbird-op-linux-495d6c9c6595ec7b37910dfd42634839431d21fd.tar.gz blackbird-op-linux-495d6c9c6595ec7b37910dfd42634839431d21fd.zip |
VFS: Clean up shared mount flag propagation
The handling of mount flags in set_mnt_shared() got a little tangled
up during previous cleanups, with the following problems:
* MNT_PNODE_MASK is defined as a literal constant when it should be a
bitwise xor of other MNT_* flags
* set_mnt_shared() clears and then sets MNT_SHARED (part of MNT_PNODE_MASK)
* MNT_PNODE_MASK could use a comment in mount.h
* MNT_PNODE_MASK is a terrible name, change to MNT_SHARED_MASK
This patch fixes these problems.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/mount.h')
-rw-r--r-- | include/linux/mount.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 5d5275364867..375d43a5d802 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -34,7 +34,16 @@ struct mnt_namespace; #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ -#define MNT_PNODE_MASK 0x3000 /* propagation flag mask */ +/* + * MNT_SHARED_MASK is the set of flags that should be cleared when a + * mount becomes shared. Currently, this is only the flag that says a + * mount cannot be bind mounted, since this is how we create a mount + * that shares events with another mount. If you add a new MNT_* + * flag, consider how it interacts with shared mounts. + */ +#define MNT_SHARED_MASK (MNT_UNBINDABLE) +#define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) + struct vfsmount { struct list_head mnt_hash; |