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FreeBSD 11.0 - man page for g_consumer (freebsd section 9)

G_CONSUMER(9)						   BSD Kernel Developer's Manual					     G_CONSUMER(9)

NAME
g_new_consumer, g_destroy_consumer -- GEOM consumers management
SYNOPSIS
#include <geom/geom.h> struct g_consumer * g_new_consumer(struct g_geom *gp); void g_destroy_consumer(struct g_consumer *cp);
DESCRIPTION
A GEOM consumer is the backdoor through which a geom connects to another GEOM provider and through which I/O requests are sent. The g_new_consumer() function creates a new consumer on geom gp. Before using the new consumer, it has to be attached to a provider with g_attach(9) and opened with g_access(9). The g_destroy_consumer() function destroys the given consumer and cancels all related pending events. This function is the last stage of killing an unwanted consumer.
RESTRICTIONS
/CONDITIONS g_new_consumer(): The geom gp has to have an orphan method defined. The topology lock has to be held. g_destroy_consumer(): The consumer must not be attached to a provider. The access count has to be 0. The topology lock has to be held.
RETURN VALUES
The g_new_consumer() function returns a pointer to the newly created consumer.
EXAMPLES
Create consumer, attach it to given provider, gain read access and clean up. void some_function(struct g_geom *mygeom, struct g_provider *pp) { struct g_consumer *cp; g_topology_assert(); /* Create new consumer on 'mygeom' geom. */ cp = g_new_consumer(mygeom); /* Attach newly created consumer to given provider. */ if (g_attach(cp, pp) != 0) { g_destroy_consumer(cp); return; } /* Open provider for reading through our consumer. */ if (g_access(cp, 1, 0, 0) != 0) { g_detach(cp); g_destroy_consumer(cp); return; } g_topology_unlock(); /* * Read data from provider. */ g_topology_lock(); /* Disconnect from provider (release access count). */ g_access(cp, -1, 0, 0); /* Detach from provider. */ g_detach(cp); /* Destroy consumer. */ g_destroy_consumer(cp); }
SEE ALSO
geom(4), DECLARE_GEOM_CLASS(9), g_access(9), g_attach(9), g_bio(9), g_data(9), g_event(9), g_geom(9), g_provider(9), g_provider_by_name(9), g_wither_geom(9)
AUTHORS
This manual page was written by Pawel Jakub Dawidek <pjd@FreeBSD.org>.
BSD
January 16, 2004 BSD

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