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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/uapi/linux/fcntl.h
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@@ -3,6 +3,7 @@
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 #define _UAPI_LINUX_FCNTL_H
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 #include <asm/fcntl.h>
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+#include <linux/openat2.h>
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 #define F_SETLEASE	(F_LINUX_SPECIFIC_BASE + 0)
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 #define F_GETLEASE	(F_LINUX_SPECIFIC_BASE + 1)
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@@ -58,12 +59,19 @@
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  * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be
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  * used to clear any hints previously set.
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  */
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-#define RWF_WRITE_LIFE_NOT_SET	0
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+#define RWH_WRITE_LIFE_NOT_SET	0
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 #define RWH_WRITE_LIFE_NONE	1
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 #define RWH_WRITE_LIFE_SHORT	2
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 #define RWH_WRITE_LIFE_MEDIUM	3
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 #define RWH_WRITE_LIFE_LONG	4
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 #define RWH_WRITE_LIFE_EXTREME	5
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+
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+/*
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+ * The originally introduced spelling is remained from the first
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+ * versions of the patch set that introduced the feature, see commit
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+ * v4.13-rc1~212^2~51.
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+ */
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+#define RWF_WRITE_LIFE_NOT_SET	RWH_WRITE_LIFE_NOT_SET
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 /*
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  * Types of directory notifications that may be requested.
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@@ -76,10 +84,20 @@
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 #define DN_ATTRIB	0x00000020	/* File changed attibutes */
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 #define DN_MULTISHOT	0x80000000	/* Don't remove notifier */
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+/*
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+ * The constants AT_REMOVEDIR and AT_EACCESS have the same value.  AT_EACCESS is
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+ * meaningful only to faccessat, while AT_REMOVEDIR is meaningful only to
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+ * unlinkat.  The two functions do completely different things and therefore,
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+ * the flags can be allowed to overlap.  For example, passing AT_REMOVEDIR to
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+ * faccessat would be undefined behavior and thus treating it equivalent to
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+ * AT_EACCESS is valid undefined behavior.
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+ */
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 #define AT_FDCWD		-100    /* Special value used to indicate
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                                            openat should use the current
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                                            working directory. */
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 #define AT_SYMLINK_NOFOLLOW	0x100   /* Do not follow symbolic links.  */
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+#define AT_EACCESS		0x200	/* Test access permitted for
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+                                           effective IDs, not real IDs.  */
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 #define AT_REMOVEDIR		0x200   /* Remove directory instead of
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                                            unlinking file.  */
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 #define AT_SYMLINK_FOLLOW	0x400   /* Follow symbolic links.  */
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@@ -91,5 +109,6 @@
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 #define AT_STATX_FORCE_SYNC	0x2000	/* - Force the attributes to be sync'd with the server */
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 #define AT_STATX_DONT_SYNC	0x4000	/* - Don't sync attributes with the server */
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+#define AT_RECURSIVE		0x8000	/* Apply to the entire subtree */
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 #endif /* _UAPI_LINUX_FCNTL_H */