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authorDan Williams <dan.j.williams@intel.com>2015-11-30 10:20:29 -0800
committerDan Williams <dan.j.williams@intel.com>2016-01-09 06:30:49 -0800
commit5a023cdba50c5f5f2bc351783b3131699deb3937 (patch)
treebae047e7bf8fb28e48563b33afc2881c226f4e31 /include/linux
parent4ebb16ca9a06a54cdb2e7f2ce1e506fa4d432445 (diff)
downloadblackbird-op-linux-5a023cdba50c5f5f2bc351783b3131699deb3937.tar.gz
blackbird-op-linux-5a023cdba50c5f5f2bc351783b3131699deb3937.zip
block: enable dax for raw block devices
If an application wants exclusive access to all of the persistent memory provided by an NVDIMM namespace it can use this raw-block-dax facility to forgo establishing a filesystem. This capability is targeted primarily to hypervisors wanting to provision persistent memory for guests. It can be disabled / enabled dynamically via the new BLKDAXSET ioctl. Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Reviewed-by: Jan Kara <jack@suse.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/fs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3aa514254161..96fabc93b583 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -482,6 +482,9 @@ struct block_device {
int bd_fsfreeze_count;
/* Mutex for freeze */
struct mutex bd_fsfreeze_mutex;
+#ifdef CONFIG_FS_DAX
+ int bd_map_count;
+#endif
};
/*
@@ -2264,6 +2267,14 @@ 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;
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