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dax: define a unified inode/address_space for device-dax mappings

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In support of enabling resize / truncate of device-dax instances, define
a pseudo-fs to provide a unified inode/address space for vm operations.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-07-24 21:55:45 -07:00
parent ba09c01d2f
commit 3bc52c45ba
3 changed files with 150 additions and 6 deletions
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1
include/uapi/linux/magic.h
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@ -65,6 +65,7 @@
#define V9FS_MAGIC 0x01021997
#define BDEVFS_MAGIC 0x62646576
#define DAXFS_MAGIC 0x64646178
#define BINFMTFS_MAGIC 0x42494e4d
#define DEVPTS_SUPER_MAGIC 0x1cd1
#define FUTEXFS_SUPER_MAGIC 0xBAD1DEA