Brian Behlendorf de198f2d95 Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency ... When using lseek(2) to report data/holes memory mapped regions of the file were ignored. This could result in incorrect results. To handle this zfs_holey_common() was updated to asynchronously writeback any dirty mmap(2) regions prior to reporting holes. Additionally, while not strictly required, the dn_struct_rwlock is now held over the dirty check to prevent the dnode structure from changing. This ensures that a clean dnode can't be dirtied before the data/hole is located. The range lock is now also taken to ensure the call cannot race with zfs_write(). Furthermore, the code was refactored to provide a dnode_is_dirty() helper function which checks the dnode for any dirty records to determine its dirtiness. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Rich Ercolani <rincebrain@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #11900 Closes #12724		2021-11-07 14:27:44 -07:00
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spl.4	Move properties, parameters, events, and concepts around manual sections	2021-06-09 14:35:30 -07:00
zfs.4	Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency	2021-11-07 14:27:44 -07:00