Re: [PATCH v3 1/4] dax: introduce a fs_dax_get_by_bdev() helper
From: Darrick J. Wong <hidden>
Date: 2017-08-30 21:40:06
Also in:
linux-xfs, nvdimm
On Wed, Aug 30, 2017 at 12:43:52PM -0700, Dan Williams wrote:
Add a helper that can replace the following common pattern: if (blk_queue_dax(bdev->bd_queue)) fs_dax_get_by_host(bdev->bd_disk->disk_name); This will be used to move dax_device lookup from iomap-operation time to fs-mount time. Cc: Jan Kara <jack@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <redacted>
Reviewed-by: Darrick J. Wong <redacted>
quoted hunk ↗ jump to hunk
--- drivers/dax/super.c | 10 ++++++++++ include/linux/dax.h | 6 ++++++ 2 files changed, 16 insertions(+)diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 938eb4868f7f..b699aac268a6 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c@@ -46,6 +46,8 @@ void dax_read_unlock(int id) EXPORT_SYMBOL_GPL(dax_read_unlock); #ifdef CONFIG_BLOCK +#include <linux/blkdev.h> + int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, pgoff_t *pgoff) {@@ -59,6 +61,14 @@ int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, } EXPORT_SYMBOL(bdev_dax_pgoff); +struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) +{ + if (!blk_queue_dax(bdev->bd_queue)) + return NULL; + return fs_dax_get_by_host(bdev->bd_disk->disk_name); +} +EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); + /** * __bdev_dax_supported() - Check if the device supports dax for filesystem * @sb: The superblock of the devicediff --git a/include/linux/dax.h b/include/linux/dax.h index df97b7af7e2c..ac8afa18f707 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h@@ -57,6 +57,7 @@ static inline void fs_put_dax(struct dax_device *dax_dev) put_dax(dax_dev); } +struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); #else static inline int bdev_dax_supported(struct super_block *sb, int blocksize) {@@ -71,6 +72,11 @@ static inline struct dax_device *fs_dax_get_by_host(const char *host) static inline void fs_put_dax(struct dax_device *dax_dev) { } + +static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) +{ + return NULL; +} #endif int dax_read_lock(void); --To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html