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evb_head
2012 Dec 18
0
[PATCH] [RFC] Btrfs: Subpagesize blocksize (WIP).
...the specified page.
+ * Should be called with the mapping''s spin lock set. */
+static struct extent_buffer *__alloc_extent_buffers(struct extent_io_tree *tree,
+ struct page *page,
+ gfp_t mask)
+{
+ u32 blocksize_bits;
+ struct btrfs_inode *inode;
+ struct extent_buffer *eb_head;
+ struct extent_buffer *eb_cur;
+ u64 start;
+ unsigned long len;
+ int i;
+
+ /* Initialize variables. */
+ inode = BTRFS_I(tree->mapping->host);
+ blocksize_bits = inode->vfs_inode.i_sb->s_blocksize_bits;
+
+ /* Calculate extent buffer dimensions. */
+ start = page->index <<...