btrfs: kill unused writepage_io_hook callback

It seems to be long time unused, since 2008 and
6885f308b5570 ("Btrfs: Misc 2.6.25 updates").

Propagating the removal touches some code but has no functional effect.

Signed-off-by: David Sterba <dsterba@suse.com>

2 files changed, 16 insertions, 24 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d247fc0eea19..d22b0777c7e0 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3368,6 +3368,8 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
 
         while (cur <= end) {
                 u64 em_end;
+                unsigned long max_nr;
+
                 if (cur >= i_size) {
                         if (tree->ops && tree->ops->writepage_end_io_hook)
                                 tree->ops->writepage_end_io_hook(page, cur,
@@ -3423,32 +3425,23 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
                         continue;
                 }
 
-                if (tree->ops && tree->ops->writepage_io_hook) {
-                        ret = tree->ops->writepage_io_hook(page, cur,
-                                                cur + iosize - 1);
-                } else {
-                        ret = 0;
+                max_nr = (i_size >> PAGE_SHIFT) + 1;
+
+                set_range_writeback(tree, cur, cur + iosize - 1);
+                if (!PageWriteback(page)) {
+                        btrfs_err(BTRFS_I(inode)->root->fs_info,
+                                   "page %lu not writeback, cur %llu end %llu",
+                               page->index, cur, end);
                 }
-                if (ret) {
-                        SetPageError(page);
-                } else {
-                        unsigned long max_nr = (i_size >> PAGE_SHIFT) + 1;
 
-                        set_range_writeback(tree, cur, cur + iosize - 1);
-                        if (!PageWriteback(page)) {
-                                btrfs_err(BTRFS_I(inode)->root->fs_info,
-                                           "page %lu not writeback, cur %llu end %llu",
-                                       page->index, cur, end);
-                        }
+                ret = submit_extent_page(write_flags, tree, wbc, page,
+                                         sector, iosize, pg_offset,
+                                         bdev, &epd->bio, max_nr,
+                                         end_bio_extent_writepage,
+                                         0, 0, 0, false);
+                if (ret)
+                        SetPageError(page);
 
-                        ret = submit_extent_page(write_flags, tree, wbc, page,
-                                                 sector, iosize, pg_offset,
-                                                 bdev, &epd->bio, max_nr,
-                                                 end_bio_extent_writepage,
-                                                 0, 0, 0, false);
-                        if (ret)
-                                SetPageError(page);
-                }
                 cur = cur + iosize;
                 pg_offset += iosize;
                 nr++;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index b5e0ade90e88..981f402bf754 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -71,7 +71,6 @@ struct extent_io_ops {
                              u64 start, u64 end, int *page_started,
                              unsigned long *nr_written);
         int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
-        int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
         extent_submit_bio_hook_t *submit_bio_hook;
         int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
                               size_t size, struct bio *bio,