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block: Update blkdev_dax_capable() for consistency 

blkdev_dax_capable() is similar to bdev_dax_supported(), but needs
to remain as a separate interface for checking dax capability of
a raw block device.

Rename and relocate blkdev_dax_capable() to keep them maintained
consistently, and call bdev_direct_access() for the dax capability
check.

There is no change in the behavior.

Link: https://lkml.org/lkml/2016/5/9/950
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@fb.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Toshi Kani 2016-05-10 10:23:57 -06:00 committed by Vishal Verma
parent 1e937cddd1
commit a8078b1fc6
4 changed files with 38 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
block/ioctl.c
View File

@ -4,7 +4,6 @@
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/badblocks.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
@ -407,35 +406,6 @@ static inline int is_unrecognized_ioctl(int ret)
ret == -ENOIOCTLCMD;
}
#ifdef CONFIG_FS_DAX
bool blkdev_dax_capable(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
if (!disk->fops->direct_access)
return false;
/*
* If the partition is not aligned on a page boundary, we can't
* do dax I/O to it.
*/
if ((bdev->bd_part->start_sect % (PAGE_SIZE / 512))
|| (bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
return false;
/*
* If the device has known bad blocks, force all I/O through the
* driver / page cache.
*
* TODO: support finer grained dax error handling
*/
if (disk->bb && disk->bb->count)
return false;
return true;
}
#endif
static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg)
{

39
fs/block_dev.c
View File

@ -29,6 +29,7 @@
#include <linux/log2.h>
#include <linux/cleancache.h>
#include <linux/dax.h>
#include <linux/badblocks.h>
#include <asm/uaccess.h>
#include "internal.h"
@ -554,6 +555,40 @@ int bdev_dax_supported(struct super_block *sb, int blocksize)
}
EXPORT_SYMBOL_GPL(bdev_dax_supported);
/**
* bdev_dax_capable() - Return if the raw device is capable for dax
* @bdev: The device for raw block device access
*/
bool bdev_dax_capable(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
struct blk_dax_ctl dax = {
.size = PAGE_SIZE,
};
if (!IS_ENABLED(CONFIG_FS_DAX))
return false;
dax.sector = 0;
if (bdev_direct_access(bdev, &dax) < 0)
return false;
dax.sector = bdev->bd_part->nr_sects - (PAGE_SIZE / 512);
if (bdev_direct_access(bdev, &dax) < 0)
return false;
/*
* If the device has known bad blocks, force all I/O through the
* driver / page cache.
*
* TODO: support finer grained dax error handling
*/
if (disk->bb && disk->bb->count)
return false;
return true;
}
/*
* pseudo-fs
*/
@ -1295,7 +1330,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!ret) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
if (!blkdev_dax_capable(bdev))
if (!bdev_dax_capable(bdev))
bdev->bd_inode->i_flags &= ~S_DAX;
}
@ -1332,7 +1367,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
goto out_clear;
}
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
if (!blkdev_dax_capable(bdev))
if (!bdev_dax_capable(bdev))
bdev->bd_inode->i_flags &= ~S_DAX;
}
} else {

1
include/linux/blkdev.h
View File

@ -1689,6 +1689,7 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *,
struct writeback_control *);
extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
extern int bdev_dax_supported(struct super_block *, int);
extern bool bdev_dax_capable(struct block_device *);
#else /* CONFIG_BLOCK */
struct block_device;

8
include/linux/fs.h
View File

@ -2319,14 +2319,6 @@ extern struct super_block *freeze_bdev(struct block_device *);
extern void emergency_thaw_all(void);
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
#ifdef CONFIG_FS_DAX
extern bool blkdev_dax_capable(struct block_device *bdev);
#else
static inline bool blkdev_dax_capable(struct block_device *bdev)
{
return false;
}
#endif
extern struct super_block *blockdev_superblock;