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dm error: add DAX support 

Allow the error target to replace an existing DAX-enabled target.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-06-24 17:09:35 -04:00
parent 84b22f8378
commit f8df1fdf18
2 changed files with 10 additions and 2 deletions
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3
drivers/md/dm-table.c
View File

@ -922,7 +922,8 @@ static int dm_table_determine_type(struct dm_table *t)
if (bio_based) { if (bio_based) {
/* We must use this table as bio-based */ /* We must use this table as bio-based */
t->type = DM_TYPE_BIO_BASED; t->type = DM_TYPE_BIO_BASED;
if (dm_table_supports_dax(t)) if (dm_table_supports_dax(t) ||
(list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED))
t->type = DM_TYPE_DAX_BIO_BASED; t->type = DM_TYPE_DAX_BIO_BASED;
return 0; return 0;
} }

9
drivers/md/dm-target.c
View File

@ -148,9 +148,15 @@ static void io_err_release_clone_rq(struct request *clone)
{ {
} }
static long io_err_direct_access(struct dm_target *ti, sector_t sector,
void __pmem **kaddr, pfn_t *pfn, long size)
{
return -EIO;
}
static struct target_type error_target = { static struct target_type error_target = {
.name = "error", .name = "error",
.version = {1, 4, 0}, .version = {1, 5, 0},
.features = DM_TARGET_WILDCARD, .features = DM_TARGET_WILDCARD,
.ctr = io_err_ctr, .ctr = io_err_ctr,
.dtr = io_err_dtr, .dtr = io_err_dtr,
@ -158,6 +164,7 @@ static struct target_type error_target = {
.map_rq = io_err_map_rq, .map_rq = io_err_map_rq,
.clone_and_map_rq = io_err_clone_and_map_rq, .clone_and_map_rq = io_err_clone_and_map_rq,
.release_clone_rq = io_err_release_clone_rq, .release_clone_rq = io_err_release_clone_rq,
.direct_access = io_err_direct_access,
}; };
int __init dm_target_init(void) int __init dm_target_init(void)