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| author | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2015-01-07 17:05:34 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-01-14 05:58:11 +0100 |
| commit | dd22f551ac0ad366f92f601835f6623b83adc331 (patch) | |
| tree | 47f6c4f274b3b6989869734b32afdc2e5d85769d /arch | |
| parent | blk-mq: export blk_mq_freeze_queue() (diff) | |
| download | linux-dd22f551ac0ad366f92f601835f6623b83adc331.tar.xz linux-dd22f551ac0ad366f92f601835f6623b83adc331.zip | |
block: Change direct_access calling convention
In order to support accesses to larger chunks of memory, pass in a
'size' parameter (counted in bytes), and return the amount available at
that address.
Add a new helper function, bdev_direct_access(), to handle common
functionality including partition handling, checking the length requested
is positive, checking for the sector being page-aligned, and checking
the length of the request does not pass the end of the partition.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/sysdev/axonram.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c index f532c92bf99d..20f8afe855d1 100644 --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -139,26 +139,17 @@ axon_ram_make_request(struct request_queue *queue, struct bio *bio) * axon_ram_direct_access - direct_access() method for block device * @device, @sector, @data: see block_device_operations method */ -static int +static long axon_ram_direct_access(struct block_device *device, sector_t sector, - void **kaddr, unsigned long *pfn) + void **kaddr, unsigned long *pfn, long size) { struct axon_ram_bank *bank = device->bd_disk->private_data; - loff_t offset; - - offset = sector; - if (device->bd_part != NULL) - offset += device->bd_part->start_sect; - offset <<= AXON_RAM_SECTOR_SHIFT; - if (offset >= bank->size) { - dev_err(&bank->device->dev, "Access outside of address space\n"); - return -ERANGE; - } + loff_t offset = (loff_t)sector << AXON_RAM_SECTOR_SHIFT; *kaddr = (void *)(bank->ph_addr + offset); *pfn = virt_to_phys(kaddr) >> PAGE_SHIFT; - return 0; + return bank->size - offset; } static const struct block_device_operations axon_ram_devops = { |