core.sys.linux.fs

D header file for the linux/fs.h interface.

This file has definitions for some important file table structures and constants and structures used by various generic file system ioctl's.

Copyright

The D Language Foundation 2021.

License : Boost License 1.0 Authors : Luís Ferreira

var BLOCK_SIZE BLOCK_SIZE_BITS FS_FL_USER_MODIFIABLE FS_FL_USER_VISIBLE FSLABEL_MAX INR_OPEN_CUR INR_OPEN_MAX NR_FILE RWF_SUPPORTED SYNC_FILE_RANGE_WAIT_AFTER SYNC_FILE_RANGE_WAIT_BEFORE SYNC_FILE_RANGE_WRITE SYNC_FILE_RANGE_WRITE_AND_WAIT

alias __kernel_rwf_t

struct file_clone_range file_dedupe_range file_dedupe_range_info files_stat_struct fstrim_range fsxattr inodes_stat_t

Types 8

structfile_clone_range

Fields

long src_fd

ulong src_offset

ulong src_length

ulong dest_offset

structfstrim_range

Fields

ulong start

ulong len

ulong minlen

structfile_dedupe_range_info

from struct btrfs_ioctl_file_extent_same_info

Fields

long dest_fd

ulong dest_offset

ulong bytes_deduped

int statusstatus of this dedupe operation: < 0 for error == FILEDEDUPERANGESAME if dedupe succeeds == FILEDEDUPERANGEDIFFERS if data differs

uint reserved

structfile_dedupe_range

from struct btrfs_ioctl_file_extent_same_args

Fields

ulong src_offset

ulong src_length

ushort dest_count

ushort reserved1

uint reserved2

file_dedupe_range_info[0] info

structfiles_stat_struct

And dynamically-tunable limits and defaults:

Fields

c_ulong nr_files

c_ulong nr_free_files

c_ulong max_files

structinodes_stat_t

Fields

c_long nr_inodes

c_long nr_unused

c_long[5] dummy

structfsxattr

Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR.

Fields

uint fsx_xflags

uint fsx_extsize

uint fsx_nextents

uint fsx_projid

uint fsx_cowextsize

ubyte[8] fsx_pad

alias__kernel_rwf_t = int

Variables 13

enumvarINR_OPEN_CUR = 1024

Initial setting for nfile rlimits

enumvarINR_OPEN_MAX = 4096

Hard limit for nfile rlimits

enumvarBLOCK_SIZE_BITS = 10

enumvarBLOCK_SIZE = 1 << BLOCK_SIZE_BITS

enumvarNR_FILE = 8192

enumvarFSLABEL_MAX = 256

Max chars for the interface; each fs may differ

enumvarFS_FL_USER_VISIBLE = 0x0003DFFF

Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)

Note

for historical reasons, these flags were originally used and

defined for use by ext2/ext3, and then other file systems started using these flags so they wouldn't need to write their own version of chattr/lsattr (which was shipped as part of e2fsprogs). You should think twice before trying to use these flags in new contexts, or trying to assign these flags, since they are used both as the UAPI and the on-disk encoding for ext2/3/4. Also, we are almost out of 32-bit flags. :-)

We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from XFS to the generic FS level interface. This uses a structure that has padding and hence has more room to grow, so it may be more appropriate for many new use cases. User visible flags

enumvarFS_FL_USER_MODIFIABLE = 0x000380FF

User modifiable flags

enumvarSYNC_FILE_RANGE_WAIT_BEFORE = 1

enumvarSYNC_FILE_RANGE_WRITE = 2

enumvarSYNC_FILE_RANGE_WAIT_AFTER = 4

enumvarSYNC_FILE_RANGE_WRITE_AND_WAIT = SYNC_FILE_RANGE_WRITE | SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WAIT_AFTER

enumvarRWF_SUPPORTED = RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT | RWF_APPEND

mask of flags supported by the kernel