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Btrfs: create helper for processing bits on contiguous pages

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

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-02-02 17:49:22 -08:00 committed by David Sterba
parent e4c3b2dcd1
commit 873695b301
1 changed files with 22 additions and 15 deletions
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37
fs/btrfs/extent_io.c
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@ -1731,28 +1731,22 @@ out_failed:
return found;
}
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)
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