Commit 9973c98e authored by Ross Zwisler's avatar Ross Zwisler Committed by Linus Torvalds

dax: add support for fsync/sync

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.

[ fix dax_pmd_dbg build warning]
Signed-off-by: default avatarRoss Zwisler <>
Cc: "H. Peter Anvin" <>
Cc: "J. Bruce Fields" <>
Cc: "Theodore Ts'o" <>
Cc: Alexander Viro <>
Cc: Andreas Dilger <>
Cc: Dave Chinner <>
Cc: Ingo Molnar <>
Cc: Jan Kara <>
Cc: Jeff Layton <>
Cc: Matthew Wilcox <>
Cc: Thomas Gleixner <>
Cc: Matthew Wilcox <>
Cc: Dave Hansen <>
Signed-off-by: default avatarDan Williams <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 7e7f7749
This diff is collapsed.
......@@ -41,4 +41,6 @@ static inline bool dax_mapping(struct address_space *mapping)
return mapping->host && IS_DAX(mapping->host);
int dax_writeback_mapping_range(struct address_space *mapping, loff_t start,
loff_t end);
......@@ -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,
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