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authorDave Chinner <dchinner@redhat.com>2015-06-04 02:18:18 +0300
committerDave Chinner <david@fromorbit.com>2015-06-04 02:18:18 +0300
commite842f2903908934187af7232fb5b21da527d1757 (patch)
tree5fe6e2da05d58519d0f9360cf5116662a766906a /fs/ext2/file.c
parentec56b1f1fdc69599963574ce94cc5693d535dd64 (diff)
downloadlinux-e842f2903908934187af7232fb5b21da527d1757.tar.xz
dax: don't abuse get_block mapping for endio callbacks
dax_fault() currently relies on the get_block callback to attach an io completion callback to the mapping buffer head so that it can run unwritten extent conversion after zeroing allocated blocks. Instead of this hack, pass the conversion callback directly into dax_fault() similar to the get_block callback. When the filesystem allocates unwritten extents, it will set the buffer_unwritten() flag, and hence the dax_fault code can call the completion function in the contexts where it is necessary without overloading the mapping buffer head. Note: The changes to ext4 to use this interface are suspect at best. In fact, the way ext4 did this end_io assignment in the first place looks suspect because it only set a completion callback when there wasn't already some other write() call taking place on the same inode. The ext4 end_io code looks rather intricate and fragile with all it's reference counting and passing to different contexts for modification via inode private pointers that aren't protected by locks... Signed-off-by: Dave Chinner <dchinner@redhat.com> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/ext2/file.c')
-rw-r--r--fs/ext2/file.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 3a0a6c6406d0..3b57c9f83c9b 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -28,12 +28,12 @@
#ifdef CONFIG_FS_DAX
static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- return dax_fault(vma, vmf, ext2_get_block);
+ return dax_fault(vma, vmf, ext2_get_block, NULL);
}
static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- return dax_mkwrite(vma, vmf, ext2_get_block);
+ return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
}
static const struct vm_operations_struct ext2_dax_vm_ops = {