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99668f6180
Now that we support non-blocking path resolution internally, expose it via openat2() in the struct open_how ->resolve flags. This allows applications using openat2() to limit path resolution to the extent that it is already cached. If the lookup cannot be satisfied in a non-blocking manner, openat2(2) will return -1/-EAGAIN. Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_OPENAT2_H
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#define _UAPI_LINUX_OPENAT2_H
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#include <linux/types.h>
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/*
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* Arguments for how openat2(2) should open the target path. If only @flags and
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* @mode are non-zero, then openat2(2) operates very similarly to openat(2).
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*
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* However, unlike openat(2), unknown or invalid bits in @flags result in
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* -EINVAL rather than being silently ignored. @mode must be zero unless one of
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* {O_CREAT, O_TMPFILE} are set.
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*
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* @flags: O_* flags.
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* @mode: O_CREAT/O_TMPFILE file mode.
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* @resolve: RESOLVE_* flags.
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*/
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struct open_how {
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__u64 flags;
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__u64 mode;
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__u64 resolve;
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};
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/* how->resolve flags for openat2(2). */
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#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
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(includes bind-mounts). */
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#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
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"magic-links". */
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#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
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(implies OEXT_NO_MAGICLINKS) */
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#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
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"..", symlinks, and absolute
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paths which escape the dirfd. */
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#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
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be scoped inside the dirfd
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(similar to chroot(2)). */
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#define RESOLVE_CACHED 0x20 /* Only complete if resolution can be
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completed through cached lookup. May
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return -EAGAIN if that's not
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possible. */
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#endif /* _UAPI_LINUX_OPENAT2_H */
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