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Commit 873695b3 authored by Liu Bo's avatar Liu Bo Committed by David Sterba
Browse files

Btrfs: create helper for processing bits on contiguous pages 



This introduces a new helper which can be used to process pages bits.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent e4c3b2dc

fs/btrfs/extent_io.c

+22 −15
Original line number Diff line number Diff line
@@ -1731,28 +1731,22 @@ STATIC u64 find_lock_delalloc_range(struct inode *inode, 
	return found;

}



void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,

				 u64 delalloc_end, struct page *locked_page,

				 unsigned clear_bits,

static void __process_pages_contig(struct address_space *mapping,

				   struct page *locked_page,

				   pgoff_t start_index, pgoff_t end_index,

				   unsigned long page_ops)

{

	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;

	int ret;

	unsigned long nr_pages = end_index - start_index + 1;

	pgoff_t index = start_index;

	struct page *pages[16];

	unsigned long index = start >> PAGE_SHIFT;

	unsigned long end_index = end >> PAGE_SHIFT;

	unsigned long nr_pages = end_index - index + 1;

	unsigned ret;

	int i;



	clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS);

	if (page_ops == 0)

		return;



	if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0)

		mapping_set_error(inode->i_mapping, -EIO);

		mapping_set_error(mapping, -EIO);



	while (nr_pages > 0) {

		ret = find_get_pages_contig(inode->i_mapping, index,

		ret = find_get_pages_contig(mapping, index,

				     min_t(unsigned long,

				     nr_pages, ARRAY_SIZE(pages)), pages);

		for (i = 0; i < ret; i++) {
@@ -1782,6 +1776,19 @@ void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 
	}

}



void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,

				 u64 delalloc_end, struct page *locked_page,

				 unsigned clear_bits,

				 unsigned long page_ops)

{

	clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, clear_bits, 1, 0,

			 NULL, GFP_NOFS);



	__process_pages_contig(inode->i_mapping, locked_page,

			       start >> PAGE_SHIFT, end >> PAGE_SHIFT,

			       page_ops);

}



/*

 * count the number of bytes in the tree that have a given bit(s)

 * set.  This can be fairly slow, except for EXTENT_DIRTY which is