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Add module parameter to disable prefetch in zfs_readdir #16318

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Add module parameter to disable prefetch in zfs_readdir #16318

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Commits on Jul 15, 2024

  1. Add module parameter to disable prefetch in zfs_readdir 

    Add paramter zfs_readdir_dnode_prefetch_limit, defaulting to 0, to
control whether zfs_readdir prefetched metadata for objects it look at
when reading a directory. If zero, metadata is prefetched for all
directory entries. If non-zero, metadata is prefetched only if
directory has fewer entries than this.

Setting it to non-0 can be important for NFS servers with directories
containing many subdirectories.

Signed-off-by: Charles Hedrick <hedrick@rutgers.edu>
Co-authored-by: Chris Siebenmann<cks@cs.toronto.edu>
    @clhedrick-student
    clhedrick-student committed Jul 15, 2024
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