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Since scrub workers only do memory allocation with GFP_KERNEL when they
need to perform repair, we can move the recent setup of the nofs context
up to scrub_handle_errored_block() instead of setting it up down the call
chain at insert_full_stripe_lock() and scrub_add_page_to_wr_bio(),
removing some duplicate code and comment. So the only paths for which a
scrub worker can do memory allocations using GFP_KERNEL are the following:
scrub_bio_end_io_worker()
scrub_block_complete()
scrub_handle_errored_block()
lock_full_stripe()
insert_full_stripe_lock()
-> kmalloc with GFP_KERNEL
scrub_bio_end_io_worker()
scrub_block_complete()
scrub_handle_errored_block()
scrub_write_page_to_dev_replace()
scrub_add_page_to_wr_bio()
-> kzalloc with GFP_KERNEL
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
7c3c7cb99c