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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.
- 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_MAXRENAME_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
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Ddoc on Mon Mar 31 10:27:42 2025