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block: Change direct_access calling convention

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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>
This commit is contained in:
Matthew Wilcox
2015-01-07 18:05:34 +02:00
committed by Jens Axboe
parent c761d96b07
commit dd22f551ac
7 changed files with 86 additions and 58 deletions
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31
fs/ext2/xip.c
View File

@@ -13,18 +13,12 @@
#include "ext2.h"
#include "xip.h"
static inline int
__inode_direct_access(struct inode *inode, sector_t block,
void **kaddr, unsigned long *pfn)
static inline long __inode_direct_access(struct inode *inode, sector_t block,
void **kaddr, unsigned long *pfn, long size)
{
struct block_device *bdev = inode->i_sb->s_bdev;
const struct block_device_operations *ops = bdev->bd_disk->fops;
sector_t sector;
sector = block * (PAGE_SIZE / 512); /* ext2 block to bdev sector */
BUG_ON(!ops->direct_access);
return ops->direct_access(bdev, sector, kaddr, pfn);
sector_t sector = block * (PAGE_SIZE / 512);
return bdev_direct_access(bdev, sector, kaddr, pfn, size);
}
static inline int
@@ -53,12 +47,13 @@ ext2_clear_xip_target(struct inode *inode, sector_t block)
{
void *kaddr;
unsigned long pfn;
int rc;
long size;
rc = __inode_direct_access(inode, block, &kaddr, &pfn);
if (!rc)
clear_page(kaddr);
return rc;
size = __inode_direct_access(inode, block, &kaddr, &pfn, PAGE_SIZE);
if (size < 0)
return size;
clear_page(kaddr);
return 0;
}
void ext2_xip_verify_sb(struct super_block *sb)
@@ -77,7 +72,7 @@ void ext2_xip_verify_sb(struct super_block *sb)
int ext2_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, int create,
void **kmem, unsigned long *pfn)
{
int rc;
long rc;
sector_t block;
/* first, retrieve the sector number */
@@ -86,6 +81,6 @@ int ext2_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, int create,
return rc;
/* retrieve address of the target data */
rc = __inode_direct_access(mapping->host, block, kmem, pfn);
return rc;
rc = __inode_direct_access(mapping->host, block, kmem, pfn, PAGE_SIZE);
return (rc < 0) ? rc : 0;
}