cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/stat.h

#ifndef _UAPI_LINUX_STAT_H

#define _UAPI_LINUX_STAT_H

#include <linux/types.h>

#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)


#define S_IFMT  00170000

#define S_IFSOCK 0140000

#define S_IFLNK	 0120000

#define S_IFREG  0100000

#define S_IFBLK  0060000

#define S_IFDIR  0040000

#define S_IFCHR  0020000

#define S_IFIFO  0010000

#define S_ISUID  0004000

#define S_ISGID  0002000

#define S_ISVTX  0001000


#define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)

#define S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)

#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)

#define S_ISCHR(m)	(((m) & S_IFMT) == S_IFCHR)

#define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)

#define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)

#define S_ISSOCK(m)	(((m) & S_IFMT) == S_IFSOCK)


#define S_IRWXU 00700

#define S_IRUSR 00400

#define S_IWUSR 00200

#define S_IXUSR 00100


#define S_IRWXG 00070

#define S_IRGRP 00040

#define S_IWGRP 00020

#define S_IXGRP 00010


#define S_IRWXO 00007

#define S_IROTH 00004

#define S_IWOTH 00002

#define S_IXOTH 00001

#endif

/*
 * Timestamp structure for the timestamps in struct statx.
 *
 * tv_sec holds the number of seconds before (negative) or after (positive)
 * 00:00:00 1st January 1970 UTC.
 *
 * tv_nsec holds a number of nanoseconds (0..999,999,999) after the tv_sec time.
 *
 * __reserved is held in case we need a yet finer resolution.
 */

struct statx_timestamp {
	
__s64	tv_sec;
	
__u32	tv_nsec;
	
__s32	__reserved;
};

/*
 * Structures for the extended file attribute retrieval system call
 * (statx()).
 *
 * The caller passes a mask of what they're specifically interested in as a
 * parameter to statx().  What statx() actually got will be indicated in
 * st_mask upon return.
 *
 * For each bit in the mask argument:
 *
 * - if the datum is not supported:
 *
 *   - the bit will be cleared, and
 *
 *   - the datum will be set to an appropriate fabricated value if one is
 *     available (eg. CIFS can take a default uid and gid), otherwise
 *
 *   - the field will be cleared;
 *
 * - otherwise, if explicitly requested:
 *
 *   - the datum will be synchronised to the server if AT_STATX_FORCE_SYNC is
 *     set or if the datum is considered out of date, and
 *
 *   - the field will be filled in and the bit will be set;
 *
 * - otherwise, if not requested, but available in approximate form without any
 *   effort, it will be filled in anyway, and the bit will be set upon return
 *   (it might not be up to date, however, and no attempt will be made to
 *   synchronise the internal state first);
 *
 * - otherwise the field and the bit will be cleared before returning.
 *
 * Items in STATX_BASIC_STATS may be marked unavailable on return, but they
 * will have values installed for compatibility purposes so that stat() and
 * co. can be emulated in userspace.
 */

struct statx {
	/* 0x00 */
	
__u32	stx_mask;	/* What results were written [uncond] */
	
__u32	stx_blksize;	/* Preferred general I/O size [uncond] */
	
__u64	stx_attributes;	/* Flags conveying information about the file [uncond] */
	/* 0x10 */
	
__u32	stx_nlink;	/* Number of hard links */
	
__u32	stx_uid;	/* User ID of owner */
	
__u32	stx_gid;	/* Group ID of owner */
	
__u16	stx_mode;	/* File mode */
	
__u16	__spare0[1];
	/* 0x20 */
	
__u64	stx_ino;	/* Inode number */
	
__u64	stx_size;	/* File size */
	
__u64	stx_blocks;	/* Number of 512-byte blocks allocated */
	
__u64	stx_attributes_mask; /* Mask to show what's supported in stx_attributes */
	/* 0x40 */
	
struct statx_timestamp	stx_atime;	/* Last access time */
	
struct statx_timestamp	stx_btime;	/* File creation time */
	
struct statx_timestamp	stx_ctime;	/* Last attribute change time */
	
struct statx_timestamp	stx_mtime;	/* Last data modification time */
	/* 0x80 */
	
__u32	stx_rdev_major;	/* Device ID of special file [if bdev/cdev] */
	
__u32	stx_rdev_minor;
	
__u32	stx_dev_major;	/* ID of device containing file [uncond] */
	
__u32	stx_dev_minor;
	/* 0x90 */
	
__u64	__spare2[14];	/* Spare space for future expansion */
	/* 0x100 */
};

/*
 * Flags to be stx_mask
 *
 * Query request/result mask for statx() and struct statx::stx_mask.
 *
 * These bits should be set in the mask argument of statx() to request
 * particular items when calling statx().
 */

#define STATX_TYPE		0x00000001U	
/* Want/got stx_mode & S_IFMT */

#define STATX_MODE		0x00000002U	
/* Want/got stx_mode & ~S_IFMT */

#define STATX_NLINK		0x00000004U	
/* Want/got stx_nlink */

#define STATX_UID		0x00000008U	
/* Want/got stx_uid */

#define STATX_GID		0x00000010U	
/* Want/got stx_gid */

#define STATX_ATIME		0x00000020U	
/* Want/got stx_atime */

#define STATX_MTIME		0x00000040U	
/* Want/got stx_mtime */

#define STATX_CTIME		0x00000080U	
/* Want/got stx_ctime */

#define STATX_INO		0x00000100U	
/* Want/got stx_ino */

#define STATX_SIZE		0x00000200U	
/* Want/got stx_size */

#define STATX_BLOCKS		0x00000400U	
/* Want/got stx_blocks */

#define STATX_BASIC_STATS	0x000007ffU	
/* The stuff in the normal stat struct */

#define STATX_BTIME		0x00000800U	
/* Want/got stx_btime */

#define STATX_ALL		0x00000fffU	
/* All currently supported flags */

#define STATX__RESERVED		0x80000000U	
/* Reserved for future struct statx expansion */

/*
 * Attributes to be found in stx_attributes and masked in stx_attributes_mask.
 *
 * These give information about the features or the state of a file that might
 * be of use to ordinary userspace programs such as GUIs or ls rather than
 * specialised tools.
 *
 * Note that the flags marked [I] correspond to generic FS_IOC_FLAGS
 * semantically.  Where possible, the numerical value is picked to correspond
 * also.
 */

#define STATX_ATTR_COMPRESSED		0x00000004 
/* [I] File is compressed by the fs */

#define STATX_ATTR_IMMUTABLE		0x00000010 
/* [I] File is marked immutable */

#define STATX_ATTR_APPEND		0x00000020 
/* [I] File is append-only */

#define STATX_ATTR_NODUMP		0x00000040 
/* [I] File is not to be dumped */

#define STATX_ATTR_ENCRYPTED		0x00000800 
/* [I] File requires key to decrypt in fs */


#define STATX_ATTR_AUTOMOUNT		0x00001000 
/* Dir: Automount trigger */


#endif /* _UAPI_LINUX_STAT_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
David Howells39799.50%480.00%
Dmitry V. Levin20.50%120.00%
Total399100.00%5100.00%
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