include/uapi/linux/ext4.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/ext4.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/ext4.h
Extension
.h
Size
5842 bytes
Lines
171
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 fsuuid {
	__u32       fsu_len;
	__u32       fsu_flags;
	__u8        fsu_uuid[];
};

/*
 * Structure for EXT4_IOC_MOVE_EXT
 */
struct move_extent {
	__u32 reserved;		/* should be zero */
	__u32 donor_fd;		/* donor file descriptor */
	__u64 orig_start;	/* logical start offset in block for orig */
	__u64 donor_start;	/* logical start offset in block for donor */
	__u64 len;		/* block length to be moved */
	__u64 moved_len;	/* moved block length */
};

/*
 * Flags used by EXT4_IOC_SHUTDOWN
 */
#define EXT4_GOING_FLAGS_DEFAULT		0x0	/* going down */
#define EXT4_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
#define EXT4_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */

/* Used to pass group descriptor data when online resize is done */
struct ext4_new_group_input {
	__u32 group;		/* Group number for this data */
	__u64 block_bitmap;	/* Absolute block number of block bitmap */
	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
	__u64 inode_table;	/* Absolute block number of inode table start */
	__u32 blocks_count;	/* Total number of blocks in this group */
	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
	__u16 unused;
};

struct ext4_tune_sb_params {
	__u32 set_flags;
	__u32 checkinterval;
	__u16 errors_behavior;
	__u16 mnt_count;
	__u16 max_mnt_count;
	__u16 raid_stride;
	__u64 last_check_time;
	__u64 reserved_blocks;
	__u64 blocks_count;
	__u32 default_mnt_opts;
	__u32 reserved_uid;
	__u32 reserved_gid;
	__u32 raid_stripe_width;
	__u16 encoding;
	__u16 encoding_flags;
	__u8  def_hash_alg;
	__u8  pad_1;
	__u16 pad_2;
	__u32 feature_compat;
	__u32 feature_incompat;
	__u32 feature_ro_compat;
	__u32 set_feature_compat_mask;
	__u32 set_feature_incompat_mask;
	__u32 set_feature_ro_compat_mask;
	__u32 clear_feature_compat_mask;
	__u32 clear_feature_incompat_mask;
	__u32 clear_feature_ro_compat_mask;
	__u8  mount_opts[64];
	__u8  pad[68];
};

#define EXT4_TUNE_FL_ERRORS_BEHAVIOR	0x00000001
#define EXT4_TUNE_FL_MNT_COUNT		0x00000002
#define EXT4_TUNE_FL_MAX_MNT_COUNT	0x00000004
#define EXT4_TUNE_FL_CHECKINTRVAL	0x00000008
#define EXT4_TUNE_FL_LAST_CHECK_TIME	0x00000010
#define EXT4_TUNE_FL_RESERVED_BLOCKS	0x00000020
#define EXT4_TUNE_FL_RESERVED_UID	0x00000040
#define EXT4_TUNE_FL_RESERVED_GID	0x00000080
#define EXT4_TUNE_FL_DEFAULT_MNT_OPTS	0x00000100
#define EXT4_TUNE_FL_DEF_HASH_ALG	0x00000200
#define EXT4_TUNE_FL_RAID_STRIDE	0x00000400
#define EXT4_TUNE_FL_RAID_STRIPE_WIDTH	0x00000800
#define EXT4_TUNE_FL_MOUNT_OPTS		0x00001000
#define EXT4_TUNE_FL_FEATURES		0x00002000
#define EXT4_TUNE_FL_EDIT_FEATURES	0x00004000
#define EXT4_TUNE_FL_FORCE_FSCK		0x00008000
#define EXT4_TUNE_FL_ENCODING		0x00010000
#define EXT4_TUNE_FL_ENCODING_FLAGS	0x00020000

/*
 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 * It indicates that the entry in extent status cache is for a hole.

Annotation

Implementation Notes