Re: [PATCH v7 2/9] dax: fix conversion of holes to PMDs

2016-01-07 Thread Jan Kara
On Wed 06-01-16 11:00:56, Ross Zwisler wrote: > When we get a DAX PMD fault for a write it is possible that there could be > some number of 4k zero pages already present for the same range that were > inserted to service reads from a hole. These 4k zero pages need to be > unmapped from the VMAs an

Re: [PATCH v7 2/9] dax: fix conversion of holes to PMDs

2016-01-06 Thread Dan Williams
On Wed, Jan 6, 2016 at 10:00 AM, Ross Zwisler wrote: > When we get a DAX PMD fault for a write it is possible that there could be > some number of 4k zero pages already present for the same range that were > inserted to service reads from a hole. These 4k zero pages need to be > unmapped from the

[PATCH v7 2/9] dax: fix conversion of holes to PMDs

2016-01-06 Thread Ross Zwisler
When we get a DAX PMD fault for a write it is possible that there could be some number of 4k zero pages already present for the same range that were inserted to service reads from a hole. These 4k zero pages need to be unmapped from the VMAs and removed from the struct address_space radix tree bef