diff options
| author | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2015-07-03 10:40:42 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-07-04 15:56:57 -0400 |
| commit | bbab37ddc20bae4709bca8745c128c4f46fe63c5 (patch) | |
| tree | 8f0d8b16e1904ef668feb9b9df4f4041db557a20 /fs/dax.c | |
| parent | 872eb127e3a6cddcfca1410bb808d9b9bc773dc1 (diff) | |
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.c | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -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; } |