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fs: add open_tree_attr()

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Add open_tree_attr() which allow to atomically create a detached mount
tree and set mount options on it. If OPEN_TREE_CLONE is used this will
allow the creation of a detached mount with a new set of mount options
without it ever being exposed to userspace without that set of mount
options applied.

Link: https://lore.kernel.org/r/20250128-work-mnt_idmap-update-v2-v1-3-c25feb0d2eb3@kernel.org
Reviewed-by: "Seth Forshee (DigitalOcean)" <sforshee@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-02-12 12:12:28 +01:00
parent 474f7825d5
commit c4a16820d9
20 changed files with 63 additions and 1 deletions
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include/uapi/asm-generic/unistd.h
+3 -1
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@@ -849,9 +849,11 @@ __SYSCALL(__NR_getxattrat, sys_getxattrat)
__SYSCALL(__NR_listxattrat, sys_listxattrat)
#define __NR_removexattrat 466
__SYSCALL(__NR_removexattrat, sys_removexattrat)
#define __NR_open_tree_attr 467
__SYSCALL(__NR_open_tree_attr, sys_open_tree_attr)
#undef __NR_syscalls
#define __NR_syscalls 467
#define __NR_syscalls 468
/*
* 32 bit systems traditionally used different