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dax: add huge page fault support

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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 <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Jan Kara <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matthew Wilcox 2015-09-08 14:58:57 -07:00 • committed by Linus Torvalds
commit 844f35db10
3 changed files with 170 additions and 3 deletions
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7
Documentation/filesystems/dax.txt
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@ -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,