diff options
| author | Jan Kara <jack@suse.cz> | 2016-08-10 18:22:44 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-12-27 07:29:24 +0300 |
| commit | c6dcf52c23d2d3fb5235cec42d7dd3f786b87d55 (patch) | |
| tree | 7e63a6c0225a769e679b194f54b5723e4cfba385 /include/linux | |
| parent | e568df6b84ff05a22467503afc11bee7a6ba0700 (diff) | |
| download | linux-c6dcf52c23d2d3fb5235cec42d7dd3f786b87d55.tar.xz | |
mm: Invalidate DAX radix tree entries only if appropriate
Currently invalidate_inode_pages2_range() and invalidate_mapping_pages()
just delete all exceptional radix tree entries they find. For DAX this
is not desirable as we track cache dirtiness in these entries and when
they are evicted, we may not flush caches although it is necessary. This
can for example manifest when we write to the same block both via mmap
and via write(2) (to different offsets) and fsync(2) then does not
properly flush CPU caches when modification via write(2) was the last
one.
Create appropriate DAX functions to handle invalidation of DAX entries
for invalidate_inode_pages2_range() and invalidate_mapping_pages() and
wire them up into the corresponding mm functions.
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dax.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h index f97bcfe79472..24ad71173995 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -41,6 +41,9 @@ ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf, struct iomap_ops *ops); int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); +int dax_invalidate_mapping_entry(struct address_space *mapping, pgoff_t index); +int dax_invalidate_mapping_entry_sync(struct address_space *mapping, + pgoff_t index); void dax_wake_mapping_entry_waiter(struct address_space *mapping, pgoff_t index, void *entry, bool wake_all); |