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Date: Fri, 25 Jun 2010 12:05:08 -0700 From: Valerie Aurora <vaurora@...hat.com> To: Alexander Viro <viro@...iv.linux.org.uk> Cc: Miklos Szeredi <miklos@...redi.hu>, Jan Blunck <jblunck@...e.de>, Christoph Hellwig <hch@...radead.org>, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Valerie Aurora <vaurora@...hat.com> Subject: [PATCH 18/38] union-mount: Introduce MNT_UNION and MS_UNION flags From: Jan Blunck <jblunck@...e.de> Add per mountpoint flag for Union Mount support. You need additional patches to util-linux for that to work - see: git://git.kernel.org/pub/scm/utils/util-linux-ng/val/util-linux-ng.git Signed-off-by: Jan Blunck <jblunck@...e.de> Signed-off-by: Valerie Aurora <vaurora@...hat.com> --- fs/namespace.c | 5 ++++- include/linux/fs.h | 1 + include/linux/mount.h | 4 ++-- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 4eb69cd..121a137 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -810,6 +810,7 @@ static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt) { MNT_NODIRATIME, ",nodiratime" }, { MNT_RELATIME, ",relatime" }, { MNT_STRICTATIME, ",strictatime" }, + { MNT_UNION, ",union" }, { 0, NULL } }; const struct proc_fs_info *fs_infop; @@ -2020,10 +2021,12 @@ long do_mount(char *dev_name, char *dir_name, char *type_page, mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME); if (flags & MS_RDONLY) mnt_flags |= MNT_READONLY; + if (flags & MS_UNION) + mnt_flags |= MNT_UNION; flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE | MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT | - MS_STRICTATIME); + MS_STRICTATIME | MS_UNION); if (flags & MS_REMOUNT) retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags, diff --git a/include/linux/fs.h b/include/linux/fs.h index b59cd7b..dbd9881 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -192,6 +192,7 @@ struct inodes_stat_t { #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ +#define MS_UNION 256 /* Merge namespace with FS mounted below */ #define MS_NOATIME 1024 /* Do not update access times. */ #define MS_NODIRATIME 2048 /* Do not update directory access times */ #define MS_BIND 4096 diff --git a/include/linux/mount.h b/include/linux/mount.h index 4bd0547..0302703 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -43,9 +43,9 @@ struct mnt_namespace; */ #define MNT_SHARED_MASK (MNT_UNBINDABLE) #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) +#define MNT_UNION 0x4000 /* top layer of a union mount */ - -#define MNT_INTERNAL 0x4000 +#define MNT_INTERNAL 0x8000 struct vfsmount { struct list_head mnt_hash; -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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