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block: Change direct_access calling convention

Browse source 
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 <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Boaz Harrosh <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Matthew Wilcox 2015-01-07 18:05:34 +02:00 • committed by Jens Axboe
commit dd22f551ac
7 changed files with 86 additions and 58 deletions
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21
drivers/s390/block/dcssblk.c
View file

@ -28,8 +28,8 @@
static int dcssblk_open(struct block_device *bdev, fmode_t mode);
static void dcssblk_release(struct gendisk *disk, fmode_t mode);
static void dcssblk_make_request(struct request_queue *q, struct bio *bio);
static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
void **kaddr, unsigned long *pfn);
static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
void **kaddr, unsigned long *pfn, long size);
static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
@ -866,25 +866,22 @@ fail:
bio_io_error(bio);
}
static int
static long
dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
void **kaddr, unsigned long *pfn)
void **kaddr, unsigned long *pfn, long size)
{
struct dcssblk_dev_info *dev_info;
unsigned long pgoff;
unsigned long offset, dev_sz;
dev_info = bdev->bd_disk->private_data;
if (!dev_info)
return -ENODEV;
if (secnum % (PAGE_SIZE/512))
return -EINVAL;
pgoff = secnum / (PAGE_SIZE / 512);
if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start)
return -ERANGE;
*kaddr = (void *) (dev_info->start+pgoff*PAGE_SIZE);
dev_sz = dev_info->end - dev_info->start;
offset = secnum * 512;
*kaddr = (void *) (dev_info->start + offset);
*pfn = virt_to_phys(*kaddr) >> PAGE_SHIFT;
return 0;
return dev_sz - offset;
}
static void