Al Viro a07b200047 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>		2019-03-20 18:49:06 -04:00
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Makefile	Merge branch 'x86/build' into x86/asm, to fix up conflicts	2017-11-07 10:54:30 +01:00
syscall_32.tbl	vfs: syscall: Add open_tree(2) to reference or clone a mount	2019-03-20 18:49:06 -04:00
syscall_64.tbl	vfs: syscall: Add open_tree(2) to reference or clone a mount	2019-03-20 18:49:06 -04:00
syscallhdr.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
syscalltbl.sh	syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()	2018-04-09 16:47:28 +02:00