Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Here's the second round of block updates for this merge window.

  It's a mix of fixes for changes that went in previously in this round,
  and fixes in general.  This pull request contains:

   - Fixes for loop from Christoph

   - A bdi vs gendisk lifetime fix from Dan, worth two cookies.

   - A blk-mq timeout fix, when on frozen queues.  From Gabriel.

   - Writeback fix from Jan, ensuring that __writeback_single_inode()
     does the right thing.

   - Fix for bio->bi_rw usage in f2fs from me.

   - Error path deadlock fix in blk-mq sysfs registration from me.

   - Floppy O_ACCMODE fix from Jiri.

   - Fix to the new bio op methods from Mike.

     One more followup will be coming here, ensuring that we don't
     propagate the block types outside of block.  That, and a rename of
     bio->bi_rw is coming right after -rc1 is cut.

   - Various little fixes"

* 'for-linus' of git://git.kernel.dk/linux-block:
  mm/block: convert rw_page users to bio op use
  loop: make do_req_filebacked more robust
  loop: don't try to use AIO for discards
  blk-mq: fix deadlock in blk_mq_register_disk() error path
  Include: blkdev: Removed duplicate 'struct request;' declaration.
  Fixup direct bi_rw modifiers
  block: fix bdi vs gendisk lifetime mismatch
  blk-mq: Allow timeouts to run while queue is freezing
  nbd: fix race in ioctl
  block: fix use-after-free in seq file
  f2fs: drop bio->bi_rw manual assignment
  block: add missing group association in bio-cloning functions
  blkcg: kill unused field nr_undestroyed_grps
  writeback: Write dirty times for WB_SYNC_ALL writeback
  floppy: fix open(O_ACCMODE) for ioctl-only open

2 files changed, 22 insertions, 3 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index efe237742074..8fde443f36d7 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -825,6 +825,20 @@ int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev)
 }
 EXPORT_SYMBOL(bdi_register_dev);
 
+int bdi_register_owner(struct backing_dev_info *bdi, struct device *owner)
+{
+        int rc;
+
+        rc = bdi_register(bdi, NULL, "%u:%u", MAJOR(owner->devt),
+                        MINOR(owner->devt));
+        if (rc)
+                return rc;
+        bdi->owner = owner;
+        get_device(owner);
+        return 0;
+}
+EXPORT_SYMBOL(bdi_register_owner);
+
 /*
  * Remove bdi from bdi_list, and ensure that it is no longer visible
  */
@@ -849,6 +863,11 @@ void bdi_unregister(struct backing_dev_info *bdi)
                 device_unregister(bdi->dev);
                 bdi->dev = NULL;
         }
+
+        if (bdi->owner) {
+                put_device(bdi->owner);
+                bdi->owner = NULL;
+        }
 }
 
 void bdi_exit(struct backing_dev_info *bdi)
diff --git a/mm/filemap.c b/mm/filemap.c
index 3083ded98b15..daef091d4c50 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -887,9 +887,9 @@ EXPORT_SYMBOL(end_page_writeback);
  * After completing I/O on a page, call this routine to update the page
  * flags appropriately
  */
-void page_endio(struct page *page, int rw, int err)
+void page_endio(struct page *page, int op, int err)
 {
-        if (rw == READ) {
+        if (!op_is_write(op)) {
                 if (!err) {
                         SetPageUptodate(page);
                 } else {
@@ -897,7 +897,7 @@ void page_endio(struct page *page, int rw, int err)
                         SetPageError(page);
                 }
                 unlock_page(page);
-        } else { /* rw == WRITE */
+        } else {
                 if (err) {
                         SetPageError(page);
                         if (page->mapping)