include/linux/falloc.h

Source file repositories/reference/linux-study-clean/include/linux/falloc.h

File Facts

System
Linux kernel
Corpus path
include/linux/falloc.h
Extension
.h
Size
1865 bytes
Lines
64
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct space_resv {
	__s16		l_type;
	__s16		l_whence;
	__s64		l_start;
	__s64		l_len;		/* len == 0 means until end of file */
	__s32		l_sysid;
	__u32		l_pid;
	__s32		l_pad[4];	/* reserved area */
};

#define FS_IOC_RESVSP		_IOW('X', 40, struct space_resv)
#define FS_IOC_UNRESVSP		_IOW('X', 41, struct space_resv)
#define FS_IOC_RESVSP64		_IOW('X', 42, struct space_resv)
#define FS_IOC_UNRESVSP64	_IOW('X', 43, struct space_resv)
#define FS_IOC_ZERO_RANGE	_IOW('X', 57, struct space_resv)

/*
 * Mask of all supported fallocate modes.  Only one can be set at a time.
 *
 * In addition to the mode bit, the mode argument can also encode flags.
 * FALLOC_FL_KEEP_SIZE is the only supported flag so far.
 */
#define FALLOC_FL_MODE_MASK	(FALLOC_FL_ALLOCATE_RANGE |	\
				 FALLOC_FL_PUNCH_HOLE |		\
				 FALLOC_FL_COLLAPSE_RANGE |	\
				 FALLOC_FL_ZERO_RANGE |		\
				 FALLOC_FL_INSERT_RANGE |	\
				 FALLOC_FL_UNSHARE_RANGE |	\
				 FALLOC_FL_WRITE_ZEROES)

/* on ia32 l_start is on a 32-bit boundary */
#if defined(CONFIG_X86_64)
struct space_resv_32 {
	__s16		l_type;
	__s16		l_whence;
	__s64		l_start	__attribute__((packed));
			/* len == 0 means until end of file */
	__s64		l_len __attribute__((packed));
	__s32		l_sysid;
	__u32		l_pid;
	__s32		l_pad[4];	/* reserve area */
};

#define FS_IOC_RESVSP_32	_IOW ('X', 40, struct space_resv_32)
#define FS_IOC_UNRESVSP_32	_IOW ('X', 41, struct space_resv_32)
#define FS_IOC_RESVSP64_32	_IOW ('X', 42, struct space_resv_32)
#define FS_IOC_UNRESVSP64_32	_IOW ('X', 43, struct space_resv_32)
#define FS_IOC_ZERO_RANGE_32	_IOW ('X', 57, struct space_resv_32)

#endif

#endif /* _FALLOC_H_ */

Annotation

Implementation Notes