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author | Damien Le Moal <damien.lemoal@wdc.com> | 2019-07-01 14:09:15 +0900 |
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committer | Jens Axboe <axboe@kernel.dk> | 2019-07-11 20:04:36 -0600 |
commit | b4c5875d36178e8df409bdce232f270cac89fafe (patch) | |
tree | 3dcf8838b6b74b38b4c1db5d154ecee93e15922c /block/blk-zoned.c | |
parent | e7bf90e5afe3aa1d1282c1635a49e17a32c4ecec (diff) | |
download | lwn-b4c5875d36178e8df409bdce232f270cac89fafe.tar.gz lwn-b4c5875d36178e8df409bdce232f270cac89fafe.zip |
block: Allow mapping of vmalloc-ed buffers
To allow the SCSI subsystem scsi_execute_req() function to issue
requests using large buffers that are better allocated with vmalloc()
rather than kmalloc(), modify bio_map_kern() to allow passing a buffer
allocated with vmalloc().
To do so, detect vmalloc-ed buffers using is_vmalloc_addr(). For
vmalloc-ed buffers, flush the buffer using flush_kernel_vmap_range(),
use vmalloc_to_page() instead of virt_to_page() to obtain the pages of
the buffer, and invalidate the buffer addresses with
invalidate_kernel_vmap_range() on completion of read BIOs. This last
point is executed using the function bio_invalidate_vmalloc_pages()
which is defined only if the architecture defines
ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE, that is, if the architecture
actually needs the invalidation done.
Fixes: 515ce6061312 ("scsi: sd_zbc: Fix sd_zbc_report_zones() buffer allocation")
Fixes: e76239a3748c ("block: add a report_zones method")
Cc: stable@vger.kernel.org
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-zoned.c')
0 files changed, 0 insertions, 0 deletions