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authorAl Viro <viro@zeniv.linux.org.uk>2018-11-05 20:40:30 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2019-03-21 01:49:06 +0300
commita07b20004793d8926f78d63eb5980559f7813404 (patch)
tree08f7516cbd8ef036fac64b225fd480c2bec3758f /include/linux/fs.h
parent9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff)
downloadlinux-a07b20004793d8926f78d63eb5980559f7813404.tar.xz
vfs: syscall: Add open_tree(2) to reference or clone a mount
open_tree(dfd, pathname, flags) Returns an O_PATH-opened file descriptor or an error. dfd and pathname specify the location to open, in usual fashion (see e.g. fstatat(2)). flags should be an OR of some of the following: * AT_PATH_EMPTY, AT_NO_AUTOMOUNT, AT_SYMLINK_NOFOLLOW - same meanings as usual * OPEN_TREE_CLOEXEC - make the resulting descriptor close-on-exec * OPEN_TREE_CLONE or OPEN_TREE_CLONE | AT_RECURSIVE - instead of opening the location in question, create a detached mount tree matching the subtree rooted at location specified by dfd/pathname. With AT_RECURSIVE the entire subtree is cloned, without it - only the part within in the mount containing the location in question. In other words, the same as mount --rbind or mount --bind would've taken. The detached tree will be dissolved on the final close of obtained file. Creation of such detached trees requires the same capabilities as doing mount --bind. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-api@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8b42df09b04c..09b05ec5d059 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -162,10 +162,13 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
#define FMODE_NONOTIFY ((__force fmode_t)0x4000000)
/* File is capable of returning -EAGAIN if I/O will block */
-#define FMODE_NOWAIT ((__force fmode_t)0x8000000)
+#define FMODE_NOWAIT ((__force fmode_t)0x8000000)
+
+/* File represents mount that needs unmounting */
+#define FMODE_NEED_UNMOUNT ((__force fmode_t)0x10000000)
/* File does not contribute to nr_files count */
-#define FMODE_NOACCOUNT ((__force fmode_t)0x20000000)
+#define FMODE_NOACCOUNT ((__force fmode_t)0x20000000)
/*
* Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector