FSP in file system

NTFSD
1

Hi there ,

One who writes an NT FSD should implement a way to run ASYNC Irps using a
defered Fsp thread .
But how does one know if an Irp can be run ASYC ? I guess by:
IoIsOperationSynchronous(pIrp) . Are there other indicators ?
Also : not running an Async IRP by an Fsp will cause only performance
degradation of other processes or can also
cause deadlock or a crash ?

thanks,
Dubi

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2

> But how does one know if an Irp can be run ASYC ? I guess by:

IoIsOperationSynchronous(pIrp) . Are there other indicators ?

IIRC this is the only one - see the FASTFAT source to be 100% sure.

Also : not running an Async IRP by an Fsp will cause only performance
degradation of other processes or can also
cause deadlock or a crash ?

See the Rajeev Nagar’s book. Failing to do the FSP path in the paging writes
originated by MPW thread can deadlock the system under stress conditions.

Max

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