Re: [PATCH v5 1/3] man/man2: introduce man page for struct file_attr

[Alejandro Colomar <alx@kernel.org>]

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Hi Andrey,

> Date: 2026-09-29 15:02:30+0200
> From: Andrey Albershteyn <aalbersh@kernel.org>
>
> Add manual pages for struct file_attr used by file_getattr() and
> file_setattr() syscalls.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
> Link: https://lore.kernel.org/all/20250630-xattrat-syscall-v6-0-c4e3bc35227b@kernel.org/

Thanks!  I've applied the patch, with some minor amendments.


Have a lovely day!
Alex

> ---
>  man/man2type/file_attr.2type | 153 +++++++++++++++++++++++++++++++++++
>  1 file changed, 153 insertions(+)
>  create mode 100644 man/man2type/file_attr.2type
> 
> diff --git a/man/man2type/file_attr.2type b/man/man2type/file_attr.2type
> new file mode 100644
> index 000000000000..3a1aabbc9e7d
> --- /dev/null
> +++ b/man/man2type/file_attr.2type
> @@ -0,0 +1,153 @@
> +.\" Copyright, the authors of the Linux man-pages project
> +.\"
> +.\" SPDX-License-Identifier: Linux-man-pages-copyleft
> +.\"
> +.TH file_attr 2type (date) "Linux man-pages (unreleased)"
> +.SH NAME
> +file_attr \- describe filesystem file attributes to get or set
> +.SH SYNOPSIS
> +.EX
> +.B #include <linux/fs.h>
> +.P
> +.B struct file_attr {
> +.BR "    u64  fa_xflags;" "     /* Extended flags */"
> +.BR "    u32  fa_extsize;" "    /* Extent size hint */"
> +.BR "    u32  fa_nextents;" "   /* Number of extents (read-only) */"
> +.BR "    u32  fa_projid;" "     /* Project identifier */"
> +.BR "    u32  fa_cowextsize;" " /* CoW extent size hint */"
> +.B };
> +.EE
> +.SH DESCRIPTION
> +Describes filesystem file attributes
> +for use with the
> +.BR file_getattr (2)
> +and
> +.BR file_setattr (2)
> +system calls.
> +.P
> +The fields are as follows:
> +.TP
> +.I fa_xflags
> +This field contains file attribute flags.
> +It is a bit mask consisting of zero or more of the
> +.B FS_XFLAG_*
> +flags.
> +Refer to the section
> +.B FLAGS
> +below for a list of all flags.
> +.TP
> +.I fa_extsize
> +Extent size allocator hint in bytes.
> +This value suggests a preferred extent size
> +for new allocations to this file.
> +.TP
> +.I fa_nextents
> +Number of data extents in the file (read-only).
> +This field is filled in by
> +.BR file_getattr (2)
> +and is ignored by
> +.BR file_setattr (2).
> +.TP
> +.I fa_projid
> +Project identifier.
> +Used by quota systems
> +.BR quotactl (2)
> +to group related files.
> +.TP
> +.I fa_cowextsize
> +Copy-on-Write (CoW) extent size hint in bytes.
> +This value suggests a preferred extent size
> +for CoW operations.
> +.SH FLAGS
> +Flags can be:
> +.RS
> +.TP
> +.B FS_XFLAG_REALTIME
> +Data is stored in a realtime volume.
> +.TP
> +.B FS_XFLAG_IMMUTABLE
> +File cannot be modified.
> +.TP
> +.B FS_XFLAG_APPEND
> +All writes must append to the end of the file.
> +.TP
> +.B FS_XFLAG_SYNC
> +All writes are synchronous.
> +.TP
> +.B FS_XFLAG_NOATIME
> +Do not update file access time on reads.
> +.TP
> +.B FS_XFLAG_NODUMP
> +Do not include file in backups.
> +.TP
> +.B FS_XFLAG_DAX
> +Use Direct Access (DAX) for I/O operations.
> +.TP
> +.B FS_XFLAG_NODEFRAG
> +Exclude this file from defragmentation operations.
> +.TP
> +.B FS_XFLAG_FILESTREAM
> +Use filestream allocator for this file.
> +.TP
> +.B FS_XFLAG_EXTSIZE
> +Use the extent size hint from the
> +.I fa_extsize
> +field.
> +.TP
> +.B FS_XFLAG_COWEXTSIZE
> +Use the CoW extent size hint from the
> +.I fa_cowextsize
> +field.
> +.RE
> +.P
> +Directory only flags:
> +.RS
> +.TP
> +.B FS_XFLAG_RTINHERIT
> +New files created in this directory inherit the realtime flag.
> +.TP
> +.B FS_XFLAG_NOSYMLINKS
> +Disallow creation of symbolic links in this directory.
> +.TP
> +.B FS_XFLAG_EXTSZINHERIT
> +New files created in this directory inherit the extent size hint.
> +.TP
> +.B FS_XFLAG_PROJINHERIT
> +New files created in this directory inherit the project identifier.
> +.RE
> +.P
> +The following flags are read-only:
> +.RS
> +.TP
> +.B FS_XFLAG_PREALLOC
> +File has preallocated extents.
> +.TP
> +.B FS_XFLAG_HASATTR
> +File has extended attributes.
> +.TP
> +.B FS_XFLAG_VERITY
> +File has fs-verity enabled.
> +.TP
> +.B FS_XFLAG_CASEFOLD
> +The filesystem performs case-insensitive lookups (file and directory name
> +comparisons ignore case).
> +.TP
> +.B FS_XFLAG_CASENONPRESERVING
> +The filesystem does not preserve the case of file and directory names.
> +.RE
> +.P
> +Not all filesystems support all flags.
> +Setting unsupported flags may result in an
> +.B EINVAL
> +or
> +.B EOPNOTSUPP
> +error.
> +.SH HISTORY
> +.SS Linux v6.17
> +This structure is introduced.
> +.SS Linux v7.2
> +The FS_XFLAG_CASEFOLD and FS_XFLAG_CASENONPRESERVING are introduced to enable
> +upper layers, such as NFSD, to retrieve case sensitivity information.
> +.SH SEE ALSO
> +.BR file_getattr (2),
> +.BR file_setattr (2)
> -- 
> 2.55.0
> 
> 

-- 
<https://www.alejandro-colomar.es>

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