| g_access.9 (131594) | g_access.9 (131689) |
|---|---|
| 1.\" 2.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 8 unchanged lines hidden (view full) --- 17.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24.\" | 1.\" 2.\" Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 8 unchanged lines hidden (view full) --- 17.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24.\" |
| 25.\" $FreeBSD: head/share/man/man9/g_access.9 131594 2004-07-04 20:55:50Z ru $ | 25.\" $FreeBSD: head/share/man/man9/g_access.9 131689 2004-07-06 08:21:12Z ru $ |
| 26.\" 27.Dd January 16, 2004 | 26.\" 27.Dd January 16, 2004 |
| 28.Dt g_access 9 | 28.Dt G_ACCESS 9 |
| 29.Os 30.Sh NAME 31.Nm g_access 32.Nd "control access to GEOM consumers and their providers" 33.Sh SYNOPSIS 34.In geom/geom.h 35.Ft int 36.Fn g_access "struct g_consumer *cp" "int dcr" "int dcw" "int dce" --- 10 unchanged lines hidden (view full) --- 47.Fa dce 48represent relative read, write, and exclusive access count changes. 49Read and write access counts are self explanatory, and 50exclusive access counts deny write access to other interested parties. 51A provider's access count is the sum of the access counts of all 52attached consumers. 53.Pp 54After attaching a consumer to a provider with | 29.Os 30.Sh NAME 31.Nm g_access 32.Nd "control access to GEOM consumers and their providers" 33.Sh SYNOPSIS 34.In geom/geom.h 35.Ft int 36.Fn g_access "struct g_consumer *cp" "int dcr" "int dcw" "int dce" --- 10 unchanged lines hidden (view full) --- 47.Fa dce 48represent relative read, write, and exclusive access count changes. 49Read and write access counts are self explanatory, and 50exclusive access counts deny write access to other interested parties. 51A provider's access count is the sum of the access counts of all 52attached consumers. 53.Pp 54After attaching a consumer to a provider with |
| 55.Fn g_attach , | 55.Xr g_attach 9 , |
| 56the 57.Fn g_access 58function has to be called on the consumer before starting I/O requests. 59.Sh RESTRICTIONS/CONDITIONS 60The consumer has to be attached to a provider. 61.Pp 62The intended change must not result in a negative access count. 63.Pp | 56the 57.Fn g_access 58function has to be called on the consumer before starting I/O requests. 59.Sh RESTRICTIONS/CONDITIONS 60The consumer has to be attached to a provider. 61.Pp 62The intended change must not result in a negative access count. 63.Pp |
| 64No\-operation is not permitted | 64No-operation is not permitted |
| 65.Fa ( dcr 66= 67.Fa dcw 68= 69.Fa dce 70= | 65.Fa ( dcr 66= 67.Fa dcw 68= 69.Fa dce 70= |
| 71.Va 0 ) . | 71.Li 0 ) . |
| 72.Pp | 72.Pp |
| 73The provider's geom must have an access method defined (e.g.\& gp->access). | 73The provider's geom must have an access method defined (e.g., 74.Va gp->access ) . |
| 74.Pp 75The topology lock has to be held. 76.Sh RETURN VALUES 77The 78.Fn g_access 79function returns 0 if successful; otherwise an error code is returned. 80Note that 81.Fn g_access --- 83 unchanged lines hidden --- | 75.Pp 76The topology lock has to be held. 77.Sh RETURN VALUES 78The 79.Fn g_access 80function returns 0 if successful; otherwise an error code is returned. 81Note that 82.Fn g_access --- 83 unchanged lines hidden --- |