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authorMatthew Wilcox <willy@linux.intel.com>2015-09-09 00:58:57 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-09 01:35:28 +0300
commit844f35db1088dd1a9de37b53d4d823626232bd19 (patch)
tree69eed4135e8653b5304e211ee8734ee73639b28e /Documentation/filesystems/dax.txt
parent5cad465d7fa646bad3d677df276bfc8e2ad709e3 (diff)
downloadlinux-844f35db1088dd1a9de37b53d4d823626232bd19.tar.xz
dax: add huge page fault support
This is the support code for DAX-enabled filesystems to allow them to provide huge pages in response to faults. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/dax.txt')
-rw-r--r--Documentation/filesystems/dax.txt7
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt
index 7af2851d667c..7bde64014a89 100644
--- a/Documentation/filesystems/dax.txt
+++ b/Documentation/filesystems/dax.txt
@@ -60,9 +60,10 @@ Filesystem support consists of
- implementing the direct_IO address space operation, and calling
dax_do_io() instead of blockdev_direct_IO() if S_DAX is set
- implementing an mmap file operation for DAX files which sets the
- VM_MIXEDMAP flag on the VMA, and setting the vm_ops to include handlers
- for fault and page_mkwrite (which should probably call dax_fault() and
- dax_mkwrite(), passing the appropriate get_block() callback)
+ VM_MIXEDMAP and VM_HUGEPAGE flags on the VMA, and setting the vm_ops to
+ include handlers for fault, pmd_fault and page_mkwrite (which should
+ probably call dax_fault(), dax_pmd_fault() and dax_mkwrite(), passing the
+ appropriate get_block() callback)
- calling dax_truncate_page() instead of block_truncate_page() for DAX files
- calling dax_zero_page_range() instead of zero_user() for DAX files
- ensuring that there is sufficient locking between reads, writes,