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authorDave Hansen <haveblue@us.ibm.com>2008-02-16 01:38:00 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 08:29:27 +0400
commit2e4b7fcd926006531935a4c79a5e9349fe51125b (patch)
tree84ba12469c4da54585e9591569e9c35fe39b635e /include/linux/mount.h
parent3d733633a633065729c9e4e254b2e5442c00ef7e (diff)
downloadlinux-2e4b7fcd926006531935a4c79a5e9349fe51125b.tar.xz
[PATCH] r/o bind mounts: honor mount writer counts at remount
Originally from: Herbert Poetzl <herbert@13thfloor.at> This is the core of the read-only bind mount patch set. Note that this does _not_ add a "ro" option directly to the bind mount operation. If you require such a mount, you must first do the bind, then follow it up with a 'mount -o remount,ro' operation: If you wish to have a r/o bind mount of /foo on bar: mount --bind /foo /bar mount -o remount,ro /bar Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/mount.h')
-rw-r--r--include/linux/mount.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 8c8e94369ac8..d6600e3f7e45 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -29,6 +29,7 @@ struct mnt_namespace;
#define MNT_NOATIME 0x08
#define MNT_NODIRATIME 0x10
#define MNT_RELATIME 0x20
+#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
#define MNT_SHRINKABLE 0x100
#define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */