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https://github.com/freebsd/freebsd-src
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8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
206 lines
5.1 KiB
Groff
206 lines
5.1 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause
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.\"
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.\" Copyright (c) 2021 The FreeBSD Foundation
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.\"
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.\" This manual page was written by Ka Ho Ng under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd August 25, 2021
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.Dt FSPACECTL 2
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.Os
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.Sh NAME
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.Nm fspacectl
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.Nd space management in a file
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In fcntl.h
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.Ft int
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.Fo fspacectl
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.Fa "int fd"
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.Fa "int cmd"
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.Fa "const struct spacectl_range *rqsr"
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.Fa "int flags"
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.Fa "struct spacectl_range *rmsr"
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.Fc
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.Sh DESCRIPTION
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.Nm
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is a system call performing space management over a file.
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The
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.Fa fd
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argument specifies the file descriptor to be operated on by the
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.Fa cmd
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argument.
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The
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.Fa rqsr
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argument points to a
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.Fa spacectl_range
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structure that contains the requested operation range.
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The
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.Fa flags
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argument controls the behavior of the operation to take place.
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If the
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.Fa rmsr
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argument is non-NULL, the
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.Fa spacectl_range
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structure it points to is updated to contain the unprocessed operation range
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after the system call returns.
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.Pp
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For a successful completion without an unprocessed part in the requested
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operation range,
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.Fa "rmsr->r_len"
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is updated to be the value 0, and
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.Fa "rmsr->r_offset"
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is updated to be
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.Fa "rqsr->r_offset"
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plus the number of bytes zeroed before the end-of-file.
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The file descriptor's file offset is not used or modified by the system call.
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Both
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.Fa rqsr
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and
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.Fa rmsr
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arguments can point to the same structure.
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.Pp
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The
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.Fa spacectl_range
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structure is defined as:
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.Bd -literal
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struct spacectl_range {
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off_t r_offset;
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off_t r_len;
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};
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.Ed
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.Pp
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The operation specified by the
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.Fa cmd
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argument may be one of:
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.Bl -tag -width SPACECTL_DEALLOC
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.It Dv SPACECTL_DEALLOC
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Zero a region in the file specified by the
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.Fa rqsr
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argument.
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The
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.Fa "rqsr->r_offset"
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has to be a value greater than or equal to 0, and the
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.Fa "rqsr->r_len"
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has to be a value greater than 0.
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.Pp
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If the file system supports hole-punching,
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file system space deallocation may be performed in the given region.
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.El
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.Pp
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The
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.Fa flags
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argument needs to be the value 0 currently.
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.Sh RETURN VALUES
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Upon successful completion, the value 0 is returned;
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otherwise the value -1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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Possible failure conditions:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa fd
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argument is not a valid file descriptor.
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.It Bq Er EBADF
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The
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.Fa fd
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argument references a file that was opened without write permission.
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.It Bq Er EINTR
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A signal was caught during execution.
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.It Bq Er EINVAL
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The
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.Fa cmd
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argument is not valid.
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.It Bq Er EINVAL
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If the
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.Fa cmd
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argument is
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.Dv SPACECTL_DEALLOC ,
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either the
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.Fa "rqsr->r_offset"
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argument was less than zero, or the
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.Fa "rqsr->r_len"
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argument was less than or equal to zero.
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.It Bq Er EINVAL
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The value of
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.Fa "rqsr->r_offset" +
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.Fa "rqsr->r_len"
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is greater than
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.Dv OFF_MAX .
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.It Bq Er EINVAL
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An invalid or unsupported flag is included in
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.Fa flags .
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.It Bq Er EINVAL
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A flag included in
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.Fa flags
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is not supported by the operation specified by the
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.Fa cmd
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argument.
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.It Bq Er EFAULT
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The
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.Fa rqsr
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or a non-NULL
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.Fa rmsr
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argument point outside the process' allocated address space.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to a file system.
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.It Bq Er EINTEGRITY
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Corrupted data was detected while reading from the file system.
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.It Bq Er ENODEV
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The
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.Fa fd
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argument does not refer to a file that supports
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.Nm .
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.It Bq Er ENOSPC
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There is insufficient free space remaining on the file system storage
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media.
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.It Bq Er ENOTCAPABLE
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The file descriptor
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.Fa fd
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has insufficient rights.
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.It Bq Er ESPIPE
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The
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.Fa fd
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argument is associated with a pipe or FIFO.
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.El
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.Sh SEE ALSO
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.Xr creat 2 ,
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.Xr ftruncate 2 ,
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.Xr open 2 ,
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.Xr unlink 2
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.Sh HISTORY
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The
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.Nm
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system call appeared in
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.Fx 14.0 .
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.Sh AUTHORS
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.Nm
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and this manual page were written by
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.An Ka Ho Ng Aq Mt khng@FreeBSD.org
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under sponsorship from the FreeBSD Foundation.
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