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authorMatthew R. Ochs <mrochs@linux.vnet.ibm.com>2015-08-13 21:47:34 -0500
committerJames Bottomley <JBottomley@Odin.com>2015-08-26 18:03:47 -0700
commit5cdac81a870f3bb65c50d3f5566a86fb086118d2 (patch)
tree48c2da1d010d7c1fa0aa325f462cce70ce109e87 /net
parentef2a388dfce6ddc2fd0d1d798a8974396f6b6a22 (diff)
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cxlflash: Base error recovery support
Introduce support for enhanced I/O error handling. A device state is added to track 3 possible states of the device: Normal - the device is operating normally and is fully operational Limbo - the device is in a reset/recovery scenario and its operational status is paused Failed/terminating - the device has either failed to be reset/recovered or is being terminated (removed); it is no longer operational All operations are allowed when the device is operating normally. When the device transitions to limbo state, I/O must be paused. To help accomplish this, a wait queue is introduced where existing and new threads can wait until the device is no longer in limbo. When coming out of limbo, threads need to check the state and error out gracefully when encountering the failed state. When the device transitions to the failed/terminating state, normal operations are no longer allowed. Only specially designated operations related to graceful cleanup are permitted. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Daniel Axtens <dja@axtens.net> Reviewed-by: Michael Neuling <mikey@neuling.org> Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> Reviewed-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
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