Commits on Mar 7, 2022

1. Fix ENOSPC when unlinking multiple files from full pool …

   When unlinking multiple files from a pool at 100% capacity, it was
   possible for ENOSPC to be returned after the first unlink.  e.g.
   
       rm -f /mnt/fs/test1.0.0 /mnt/fs/test1.1.0 /mnt/fs/test1.2.0
       rm: cannot remove '/mnt/fs/test1.1.0': No space left on device
       rm: cannot remove '/mnt/fs/test1.2.0': No space left on device
   
   After waiting for the pending deferred frees from the first unlink to
   be processed the remaining files can then be unlinked.  This is caused
   by the quota limit in dsl_dir_tempreserve_impl() being temporarily
   decreased to the allocatable pool capacity less any deferred free
   space.
   
   This is resolved using the existing mechanism of returning ERESTART
   when over quota as long as we know enough space will shortly be
   available after processing the pending deferred frees.
   
   Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

   

   behlendorf committed Mar 7, 2022
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