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| author | Toshi Kani <toshi.kani@hpe.com> | 2016-05-10 19:23:53 +0300 |
|---|---|---|
| committer | Vishal Verma <vishal.l.verma@intel.com> | 2016-05-17 09:44:11 +0300 |
| commit | 2d96afc8f70ef86c66a0b5d80c24a27d6dd13df3 (patch) | |
| tree | 094e60ebc2d1ecd365c8d2e38a1502d0e6c36999 /include/linux/blkdev.h | |
| parent | 2af3a8159cd204fc8437ed2f75863f0fb930f0d0 (diff) | |
| download | linux-2d96afc8f70ef86c66a0b5d80c24a27d6dd13df3.tar.xz | |
block: Add bdev_dax_supported() for dax mount checks
DAX imposes additional requirements to a device. Add
bdev_dax_supported() which performs all the precondition checks
necessary for filesystem to mount the device with dax option.
Also add a new check to verify if a partition is aligned by 4KB.
When a partition is unaligned, any dax read/write access fails,
except for metadata update.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@fb.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
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>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 78c48ab22f46..71231a55debd 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1688,6 +1688,7 @@ extern int bdev_read_page(struct block_device *, sector_t, struct page *); 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); #else /* CONFIG_BLOCK */ struct block_device; |