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authorMatthew Wilcox <matthew.r.wilcox@intel.com>2015-07-03 10:40:42 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-07-04 15:56:57 -0400
commitbbab37ddc20bae4709bca8745c128c4f46fe63c5 (patch)
tree8f0d8b16e1904ef668feb9b9df4f4041db557a20 /fs/dax.c
parent872eb127e3a6cddcfca1410bb808d9b9bc773dc1 (diff)
downloadlinux-bbab37ddc20bae4709bca8745c128c4f46fe63c5.tar.gz
block: Add support for DAX reads/writes to block devices
If a block device supports the ->direct_access methods, bypass the normal DIO path and use DAX to go straight to memcpy() instead of allocating a DIO and a BIO. Includes support for the DIO_SKIP_DIO_COUNT flag in DAX, as is done in do_blockdev_direct_IO(). Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 159f796afa85..37a0c4826c1a 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -209,7 +209,8 @@ ssize_t dax_do_io(struct kiocb *iocb, struct inode *inode,
}
/* Protects against truncate */
- inode_dio_begin(inode);
+ if (!(flags & DIO_SKIP_DIO_COUNT))
+ inode_dio_begin(inode);
retval = dax_io(inode, iter, pos, end, get_block, &bh);
@@ -219,7 +220,8 @@ ssize_t dax_do_io(struct kiocb *iocb, struct inode *inode,
if ((retval > 0) && end_io)
end_io(iocb, pos, retval, bh.b_private);
- inode_dio_end(inode);
+ if (!(flags & DIO_SKIP_DIO_COUNT))
+ inode_dio_end(inode);
out:
return retval;
}