core.sys.linux.fs

enum int INR_OPEN_CUR;

Initial setting for nfile rlimits

enum int INR_OPEN_MAX;

Hard limit for nfile rlimits

enum int BLOCK_SIZE_BITS;

enum int BLOCK_SIZE;

SEEK_SET

seek relative to beginning of file

SEEK_CUR

seek relative to current file position

SEEK_END

seek relative to end of file

SEEK_DATA

seek to the next data

SEEK_HOLE

seek to the next hole

SEEK_MAX

RENAME_NOREPLACE

Don't overwrite target

RENAME_EXCHANGE

Exchange source and dest

RENAME_WHITEOUT

Whiteout source

struct file_dedupe_range_info;

from struct btrfs_ioctl_file_extent_same_info

long dest_fd;

in - destination file

ulong dest_offset;

in - start of extent in destination

ulong bytes_deduped;

out - total # of bytes we were able to dedupe from this file.

int status;

status of this dedupe operation: < 0 for error == FILE_DEDUPE_RANGE_SAME if dedupe succeeds == FILE_DEDUPE_RANGE_DIFFERS if data differs

uint reserved;

must be zero

struct file_dedupe_range;

from struct btrfs_ioctl_file_extent_same_args

ulong src_offset;

in - start of extent in source

ulong src_length;

in - length of extent

ushort dest_count;

in - total elements in info array

ushort reserved1;

must be zero

uint reserved2;

must be zero

struct files_stat_struct;

And dynamically-tunable limits and defaults:

c_ulong nr_files;

read only

c_ulong nr_free_files;

read only

c_ulong max_files;

tunable

struct fsxattr;

Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.

uint fsx_projid;

project identifier

uint fsx_cowextsize;

CoW extsize

S_XFLAG_REALTIME

data in realtime volume

S_XFLAG_PREALLOC

preallocated file extents

S_XFLAG_IMMUTABLE

file cannot be modified

S_XFLAG_APPEND

all writes append

S_XFLAG_SYNC

all writes synchronous

S_XFLAG_NOATIME

do not update access time

S_XFLAG_NODUMP

do not include in backups

S_XFLAG_RTINHERIT

create with rt bit set

S_XFLAG_PROJINHERIT

create with parents projid

S_XFLAG_NOSYMLINKS

disallow symlink creation

S_XFLAG_EXTSIZE

extent size allocator hint

S_XFLAG_EXTSZINHERIT

inherit inode extent size

S_XFLAG_NODEFRAG

do not defragment

S_XFLAG_FILESTREAM

use filestream allocator

S_XFLAG_DAX

use DAX for IO

S_XFLAG_COWEXTSIZE

CoW extent size allocator hint

S_XFLAG_HASATTR

no DIFLAG for this

enum int BLKROSET;

set device read-only

enum int BLKROGET;

get read-only status

enum int BLKRRPART;

re-read partition table

enum int BLKGETSIZE;

return device size

enum int BLKFLSBUF;

flush buffer cache

enum int BLKRASET;

set read ahead for block device

enum int BLKRAGET;

get current read ahead setting

enum int BLKFRASET;

set filesystem

enum int BLKFRAGET;

get filesystem

enum int BLKSECTSET;

set max sectors per request

enum int BLKSECTGET;

get max sectors per request

enum int BLKSSZGET;

get block device sector size

enum int BMAP_IOCTL;

obsolete - kept for compatibility

enum int FIBMAP;

bmap access

enum int FIGETBSZ;

get the block size used for bmap

enum int FSLABEL_MAX;

Max chars for the interface; each fs may differ

FS_SECRM_FL

Secure deletion

FS_UNRM_FL

Undelete

FS_COMPR_FL

Compress file

FS_SYNC_FL

Synchronous updates

FS_IMMUTABLE_FL

Immutable file

FS_APPEND_FL

writes to file may only append

FS_NODUMP_FL

do not dump file

FS_NOATIME_FL

do not update atime

FS_DIRTY_FL

Reserved for compression usage

FS_COMPRBLK_FL

One or more compressed clusters

FS_NOCOMP_FL

Don't compress

FS_ENCRYPT_FL

Encrypted file

FS_BTREE_FL

btree format dir

FS_INDEX_FL

hash-indexed directory

FS_IMAGIC_FL

AFS directory

FS_JOURNAL_DATA_FL

Reserved for ext3

FS_NOTAIL_FL

file tail should not be merged

FS_DIRSYNC_FL

dirsync behaviour (directories only)

FS_TOPDIR_FL

Top of directory hierarchie

FS_HUGE_FILE_FL

Reserved for ext4

FS_EXTENT_FL

Extents

FS_VERITY_FL

Verity protected inode

FS_EA_INODE_FL

Inode used for large EA

FS_EOFBLOCKS_FL

Reserved for ext4

FS_NOCOW_FL

Do not cow file

FS_DAX_FL

Inode is DAX

FS_INLINE_DATA_FL

Reserved for ext4

FS_PROJINHERIT_FL

Create with parents projid

FS_CASEFOLD_FL

Folder is case insensitive

FS_RESERVED_FL

reserved for ext2 lib

enum int FS_FL_USER_VISIBLE;

User visible flags

enum int FS_FL_USER_MODIFIABLE;

User modifiable flags

RWF_HIPRI

high priority request, poll if possible

RWF_DSYNC

per-IO O_DSYNC

RWF_SYNC

per-IO O_SYNC

RWF_NOWAIT

per-IO, return -EAGAIN if operation would block

RWF_APPEND

per-IO O_APPEND

enum int RWF_SUPPORTED;

mask of flags supported by the kernel