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>
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 58ad258..e3a25be 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1397,12 +1397,7 @@
* 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 @@
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 @@
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 @@
* 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 @@
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 @@
} 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 @@
* 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 @@
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 @@
} 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 @@
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 @@
}
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 @@
* 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 @@
}
}
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;