Type Alias winfsp_sys::FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY

source · 
pub type FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY = c_int;
Expand description

User mode file system locking strategy.

Two concurrency models are provided:

  1. A fine-grained concurrency model where file system NAMESPACE accesses are guarded using an exclusive-shared (read-write) lock. File I/O is not guarded and concurrent reads/writes/etc. are possible. [Note that the FSD will still apply an exclusive-shared lock PER INDIVIDUAL FILE, but it will not limit I/O operations for different files.]

The fine-grained concurrency model applies the exclusive-shared lock as follows:

  • EXCL: SetVolumeLabel, Flush(Volume), Create, Cleanup(Delete), SetInformation(Rename)
  • SHRD: GetVolumeInfo, Open, SetInformation(Disposition), ReadDirectory
  • NONE: all other operations
  1. A coarse-grained concurrency model where all file system accesses are guarded by a mutually exclusive lock.

@see FspFileSystemSetOperationGuardStrategy