mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-17 10:26:15 +00:00
Code Issues Releases Activity

Implement a handle for efficient implementation of perforations in

Browse Source 
lower extremities.

Setting bit 4 in debugflags (sysctl kern.geom.debugflags=16) will
allow any open to succeed on rank#1 providers.  This will generally
correspond to the physical disk devices: ad0, da0, md0 etc.

This fundamentally violates the mechanics of GEOMs autoconfiguration,
and is only provided as a debugging facility, so obviously error
reports on GEOM where this bit is or has been set will not be
accepted.
This commit is contained in:
Poul-Henning Kamp 2003-02-12 09:48:27 +00:00
parent 487106ce7a
commit 8ebd558f5d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=110759
2 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
sys/geom/geom_int.h
View File

@ -42,10 +42,13 @@ TAILQ_HEAD(event_tailq_head, g_event);
extern struct event_tailq_head events;
extern int g_collectstats;
extern int g_debugflags;
/* 1 G_T_TOPOLOGY */
/* 2 G_T_BIO */
/* 4 G_T_ACCESS */
/* 8 enable sanity checks */
/*
* 1 G_T_TOPOLOGY
* 2 G_T_BIO
* 4 G_T_ACCESS
* 8 enable sanity checks
* 16 Allow footshooting on rank#1 providers
*/
/*
* Various internal actions are tracked by tagging g_event[s] onto

9
sys/geom/geom_subr.c
View File

@ -418,14 +418,17 @@ g_access_rel(struct g_consumer *cp, int dcr, int dcw, int dce)
pp->acr, pp->acw, pp->ace,
pp, pp->name);
/* If foot-shooting is enabled, any open on rank#1 is OK */
if ((g_debugflags & 16) && pp->geom->rank == 1)
;
/* If we try exclusive but already write: fail */
if (dce > 0 && pw > 0)
else if (dce > 0 && pw > 0)
return (EPERM);
/* If we try write but already exclusive: fail */
if (dcw > 0 && pe > 0)
else if (dcw > 0 && pe > 0)
return (EPERM);
/* If we try to open more but provider is error'ed: fail */
if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0)
else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0)
return (pp->error);
/* Ok then... */