Remove Btrfs compat code for older kernels

Btrfs had compatibility code for kernels back to 2.6.18.  These have
been removed, and will be maintained in a separate backport
git tree from now on.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 63 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 58ad25838a41..e3a25be5c663 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1397,12 +1397,7 @@ static int check_page_writeback(struct extent_io_tree *tree,
  * Scheduling is not allowed, so the extent state tree is expected
  * to have one and only one object corresponding to this IO.
  */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
 static void end_bio_extent_writepage(struct bio *bio, int err)
-#else
-static int end_bio_extent_writepage(struct bio *bio,
-                                   unsigned int bytes_done, int err)
-#endif
 {
         int uptodate = err == 0;
         struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
@@ -1412,10 +1407,6 @@ static int end_bio_extent_writepage(struct bio *bio,
         int whole_page;
         int ret;
 
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        if (bio->bi_size)
-                return 1;
-#endif
         do {
                 struct page *page = bvec->bv_page;
                 tree = &BTRFS_I(page->mapping->host)->io_tree;
@@ -1461,10 +1452,8 @@ static int end_bio_extent_writepage(struct bio *bio,
                 else
                         check_page_writeback(tree, page);
         } while (bvec >= bio->bi_io_vec);
+
         bio_put(bio);
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        return 0;
-#endif
 }
 
 /*
@@ -1478,12 +1467,7 @@ static int end_bio_extent_writepage(struct bio *bio,
  * Scheduling is not allowed, so the extent state tree is expected
  * to have one and only one object corresponding to this IO.
  */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
 static void end_bio_extent_readpage(struct bio *bio, int err)
-#else
-static int end_bio_extent_readpage(struct bio *bio,
-                                   unsigned int bytes_done, int err)
-#endif
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
@@ -1493,11 +1477,6 @@ static int end_bio_extent_readpage(struct bio *bio,
         int whole_page;
         int ret;
 
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        if (bio->bi_size)
-                return 1;
-#endif
-
         do {
                 struct page *page = bvec->bv_page;
                 tree = &BTRFS_I(page->mapping->host)->io_tree;
@@ -1556,9 +1535,6 @@ static int end_bio_extent_readpage(struct bio *bio,
         } while (bvec >= bio->bi_io_vec);
 
         bio_put(bio);
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        return 0;
-#endif
 }
 
 /*
@@ -1566,12 +1542,7 @@ static int end_bio_extent_readpage(struct bio *bio,
  * the structs in the extent tree when done, and set the uptodate bits
  * as appropriate.
  */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
 static void end_bio_extent_preparewrite(struct bio *bio, int err)
-#else
-static int end_bio_extent_preparewrite(struct bio *bio,
-                                       unsigned int bytes_done, int err)
-#endif
 {
         const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
@@ -1579,11 +1550,6 @@ static int end_bio_extent_preparewrite(struct bio *bio,
         u64 start;
         u64 end;
 
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        if (bio->bi_size)
-                return 1;
-#endif
-
         do {
                 struct page *page = bvec->bv_page;
                 tree = &BTRFS_I(page->mapping->host)->io_tree;
@@ -1607,9 +1573,6 @@ static int end_bio_extent_preparewrite(struct bio *bio,
         } while (bvec >= bio->bi_io_vec);
 
         bio_put(bio);
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-        return 0;
-#endif
 }
 
 static struct bio *
@@ -2079,12 +2042,6 @@ done:
         return 0;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
-/* Taken directly from 2.6.23 with a mod for a lockpage hook */
-typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
-                                void *data);
-#endif
-
 /**
  * write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
  * @mapping: address space structure to write
@@ -2201,10 +2158,9 @@ retry:
         }
         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
                 mapping->writeback_index = index;
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
+
         if (wbc->range_cont)
                 wbc->range_start = index << PAGE_CACHE_SHIFT;
-#endif
         return ret;
 }
 EXPORT_SYMBOL(extent_write_cache_pages);
@@ -2560,18 +2516,10 @@ static inline struct page *extent_buffer_page(struct extent_buffer *eb,
          * by increasing the reference count.  So we know the page must
          * be in the radix tree.
          */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
         rcu_read_lock();
-#else
-        read_lock_irq(&mapping->tree_lock);
-#endif
         p = radix_tree_lookup(&mapping->page_tree, i);
-
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
         rcu_read_unlock();
-#else
-        read_unlock_irq(&mapping->tree_lock);
-#endif
+
         return p;
 }
 
@@ -2773,21 +2721,13 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
                         }
                 }
                 clear_page_dirty_for_io(page);
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
                 spin_lock_irq(&page->mapping->tree_lock);
-#else
-                read_lock_irq(&page->mapping->tree_lock);
-#endif
                 if (!PageDirty(page)) {
                         radix_tree_tag_clear(&page->mapping->page_tree,
                                                 page_index(page),
                                                 PAGECACHE_TAG_DIRTY);
                 }
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
                 spin_unlock_irq(&page->mapping->tree_lock);
-#else
-                read_unlock_irq(&page->mapping->tree_lock);
-#endif
                 unlock_page(page);
         }
         return 0;