xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dax: Introduce a ->copy_to_iter dax operation

Browse Source 
Similar to the ->copy_from_iter() operation, a platform may want to
deploy an architecture or device specific routine for handling reads
from a dax_device like /dev/pmemX. On x86 this routine will point to a
machine check safe version of copy_to_iter(). For now, add the plumbing
to device-mapper and the dax core.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2018-05-02 06:46:33 -07:00
parent 522239b445
commit b3a9a0c36e
10 changed files with 111 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
fs/dax.c
View File

@@ -1057,7 +1057,8 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
map_len = dax_copy_from_iter(dax_dev, pgoff, kaddr,
map_len, iter);
else
map_len = copy_to_iter(kaddr, map_len, iter);
map_len = dax_copy_to_iter(dax_dev, pgoff, kaddr,
map_len, iter);
if (map_len <= 0) {
ret = map_len ? map_len : -EFAULT;
break;