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7b98f0d91f
Added support for the bops->check_events() interface which was added in the 2.6.38 kernel to replace bops->media_changed(). Fully implementing this functionality allows the volume resize code to rely on revalidate_disk(), which is the preferred mechanism, and removes the need to use check_disk_size_change(). In order for bops->check_events() to lookup the zvol_state_t stored in the disk->private_data the zvol_state_lock needs to be held. Since the check events interface may poll the mutex has been converted to a rwlock for better concurrently. The rwlock need only be taken as a writer in the zvol_free() path when disk->private_data is set to NULL. The configure checks for the block_device_operations structure were consolidated in a single kernel-block-device-operations.m4 file. The ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS configure checks and assoicated dead code was removed. This interface was added to the 2.6.28 kernel which predates the oldest supported 2.6.32 kernel and will therefore always be available. Updated maximum Linux version in META file. The 4.17 kernel was released on 2018-06-03 and ZoL is compatible with the finalized kernel. Reviewed-by: Boris Protopopov <boris.protopopov@actifio.com> Reviewed-by: Sara Hartse <sara.hartse@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7611 |
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