freebsd-dev/sys/cam
John Polstra a7e69e8b7d Fix a bug that caused some /dev entries to continue to exist after
the underlying drive had been hot-unplugged from the system.  Here
is a specific example.  Filesystem code had opened /dev/da1s1e.
Subsequently, the drive was hot-unplugged.  This (correctly) caused
all of the associated /dev/da1* entries to be deleted.  When the
filesystem later realized that the drive was gone it closed the
device, reducing the write-access counts to 0 on the geom providers
for da1s1e, da1s1, and da1.  This caused geom to re-taste the
providers, resulting in the devices being created again.  When the
drive was hot-plugged back in, it resulted in duplicate /dev entries
for da1s1e, da1s1, and da1.

This fix adds a new disk_gone() function which is called by CAM when a
drive goes away.  It orphans all of the providers associated with the
drive, setting an error condition of ENXIO in each one.  In addition,
we prevent a re-taste on last close for writing if an error condition
has been set in the provider.

Sponsored by:   Isilon Systems
Reviewed by:    phk
MFC after:      1 week
2005-11-18 02:43:49 +00:00
..
scsi Fix a bug that caused some /dev entries to continue to exist after 2005-11-18 02:43:49 +00:00
cam_ccb.h
cam_debug.h
cam_periph.c - Providing fine-grained malloc statistic by replacing M_DEVBUF with 2005-07-01 15:21:30 +00:00
cam_periph.h
cam_queue.c - Providing fine-grained malloc statistic by replacing M_DEVBUF with 2005-07-01 15:21:30 +00:00
cam_queue.h
cam_sim.c - Providing fine-grained malloc statistic by replacing M_DEVBUF with 2005-07-01 15:21:30 +00:00
cam_sim.h
cam_xpt_periph.h - Providing fine-grained malloc statistic by replacing M_DEVBUF with 2005-07-01 15:21:30 +00:00
cam_xpt_sim.h
cam_xpt.c Make the exploring of all luns supported by an HBA more of a 2005-09-16 01:26:17 +00:00
cam_xpt.h
cam.c
cam.h