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SPDX-License-Identifier: BSD-2-Clause-FreeBSD
Copyright (c) 2019 The FreeBSD Foundation
This documentation was written by BFF Storage Systems, LLC under
sponsorship from the FreeBSD Foundation.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: stable/11/share/man/man9/VOP_BMAP.9 350126 2019-07-19 14:24:33Z asomers $
.Dd June 19, 2019 .Dt VOP_BMAP 9 .Os .Sh NAME .Nm VOP_BMAP .Nd Logical to physical block number conversion .Sh SYNOPSIS n sys/param.h n sys/vnode.h .Ft int .Fn VOP_BMAP "struct vnode *vp" "daddr_t bn" "struct bufobj **bop" "daddr_t *bnp" "int *runp" "int *runb" .Sh DESCRIPTION This vnode call is used to lookup the physical block number of the file system's underlying device where a given logical block of a file is stored. Its arguments are: l -tag -width type t Fa vp The vnode of the file. t Fa bn Logical block number within the file identified by .Fa vp . t Fa bop Return storage for the buffer object associated with the file system's underlying device. t Fa bnp Return storage for the physical block number. t Fa runp Return storage for the number of succeeding logical blocks that may be efficiently read at the same time as the requested block. This will usually be the number of logical blocks whose physical blocks are contiguously allocated. However a file system is free to define "efficient" as it see fit. t Fa runb Like .Fa runp but for preceding rather than succeeding blocks. .El
SPDX-License-Identifier: BSD-2-Clause-FreeBSD
Copyright (c) 2019 The FreeBSD Foundation
This documentation was written by BFF Storage Systems, LLC under
sponsorship from the FreeBSD Foundation.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD: stable/11/share/man/man9/VOP_BMAP.9 350126 2019-07-19 14:24:33Z asomers $
.Dd June 19, 2019 .Dt VOP_BMAP 9 .Os .Sh NAME .Nm VOP_BMAP .Nd Logical to physical block number conversion .Sh SYNOPSIS n sys/param.h n sys/vnode.h .Ft int .Fn VOP_BMAP "struct vnode *vp" "daddr_t bn" "struct bufobj **bop" "daddr_t *bnp" "int *runp" "int *runb" .Sh DESCRIPTION This vnode call is used to lookup the physical block number of the file system's underlying device where a given logical block of a file is stored. Its arguments are: l -tag -width type t Fa vp The vnode of the file. t Fa bn Logical block number within the file identified by .Fa vp . t Fa bop Return storage for the buffer object associated with the file system's underlying device. t Fa bnp Return storage for the physical block number. t Fa runp Return storage for the number of succeeding logical blocks that may be efficiently read at the same time as the requested block. This will usually be the number of logical blocks whose physical blocks are contiguously allocated. However a file system is free to define "efficient" as it see fit. t Fa runb Like .Fa runp but for preceding rather than succeeding blocks. .El
p Any of the return arguments may be .Dv NULL to indicate that the caller does not care about that information. .Sh LOCKS The vnode will be locked on entry and should remain locked on return. .Sh RETURN VALUES Zero is returned on success, otherwise an error code is returned. .Sh SEE ALSO .Xr vnode 9 , .Sh HISTORY A .Fn bmap function first appeared in x 4.2 . .Sh AUTHORS This manual page was written by .An Alan Somers .