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dax: add support for fsync/sync

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To properly handle fsync/msync in an efficient way DAX needs to track
dirty pages so it is able to flush them durably to media on demand.

The tracking of dirty pages is done via the radix tree in struct
address_space.  This radix tree is already used by the page writeback
infrastructure for tracking dirty pages associated with an open file,
and it already has support for exceptional (non struct page*) entries.
We build upon these features to add exceptional entries to the radix
tree for DAX dirty PMD or PTE pages at fault time.

[[email protected]: fix dax_pmd_dbg build warning]
Signed-off-by: Ross Zwisler <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Dave Hansen <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ross Zwisler 2016-01-22 15:10:47 -08:00 • committed by Linus Torvalds
commit 9973c98ecf
3 changed files with 266 additions and 16 deletions
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6
mm/filemap.c
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@ -482,6 +482,12 @@ int filemap_write_and_wait_range(struct address_space *mapping,
{
int err = 0;
if (dax_mapping(mapping) && mapping->nrexceptional) {
err = dax_writeback_mapping_range(mapping, lstart, lend);
if (err)
return err;
}
if (mapping->nrpages) {
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);