[PATCH 2/2] btrfs: remove duplicates of filemap_ helpers

Christoph Hellwig
2009-09-30T19:59:44Z

Use filemap_fdatawrite_range and filemap_fdatawait_range instead of
local copies of the functions. For filemap_fdatawait_range that
also means replacing the awkward old wait_on_page_writeback_range
calling convention with the regular filemap byte offsets.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6/fs/btrfs/disk-io.c
===================================================================
--- linux-2.6.orig/fs/btrfs/disk-io.c 2009-09-30 13:55:25.396005824 -0300
+++ linux-2.6/fs/btrfs/disk-io.c 2009-09-30 13:57:49.917005980 -0300
@@ -822,16 +822,14 @@ struct extent_buffer *btrfs_find_create_

int btrfs_write_tree_block(struct extent_buffer *buf)
{
- return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start,
- buf->start + buf->len - 1, WB_SYNC_ALL);
+ return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
+ buf->start + buf->len - 1);
}

int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
{
- return btrfs_wait_on_page_writeback_range(buf->first_page->mapping,
- buf->start >> PAGE_CACHE_SHIFT,
- (buf->start + buf->len - 1) >>
- PAGE_CACHE_SHIFT);
+ return filemap_fdatawait_range(buf->first_page->mapping,
+ buf->start, buf->start + buf->len - 1);
}

struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
Index: linux-2.6/fs/btrfs/ordered-data.c
===================================================================
--- linux-2.6.orig/fs/btrfs/ordered-data.c 2009-09-30 13:44:52.424274060 -0300
+++ linux-2.6/fs/btrfs/ordered-data.c 2009-09-30 13:56:56.751254722 -0300
@@ -458,7 +458,7 @@ void btrfs_start_ordered_extent(struct i
* start IO on any dirty ones so the wait doesn't stall waiting
* for pdflush to find them
*/
- btrfs_fdatawrite_range(inode->i_mapping, start, end, WB_SYNC_ALL);
+ filemap_fdatawrite_range(inode->i_mapping, start, end);
if (wait) {
wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
&entry->flags));
@@ -488,17 +488,15 @@ again:
/* start IO across the range first to instantiate any delalloc
* extents
*/
- btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
+ filemap_fdatawrite_range(inode->i_mapping, start, orig_end);

/* The compression code will leave pages locked but return from
* writepage without setting the page writeback. Starting again
* with WB_SYNC_ALL will end up waiting for the IO to actually start.
*/
- btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
+ filemap_fdatawrite_range(inode->i_mapping, start, orig_end);

- btrfs_wait_on_page_writeback_range(inode->i_mapping,
- start >> PAGE_CACHE_SHIFT,
- orig_end >> PAGE_CACHE_SHIFT);
+ filemap_fdatawait_range(inode->i_mapping, start, orig_end);

end = orig_end;
found = 0;
@@ -716,89 +714,6 @@ out:
}

-/**
- * taken from mm/filemap.c because it isn't exported
- *
- * __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
- * @mapping: address space structure to write
- * @start: offset in bytes where the range starts
- * @end: offset in bytes where the range ends (inclusive)
- * @sync_mode: enable synchronous operation
- *
- * Start writeback against all of a mapping's dirty pages that lie
- * within the byte offsets <start, end> inclusive.
- *
- * If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
- * opposed to a regular memory cleansing writeback. The difference between
- * these two operations is that if a dirty page/buffer is encountered, it must
- * be waited upon, and not just skipped over.
- */
-int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
- loff_t end, int sync_mode)
-{
- struct writeback_control wbc = {
- .sync_mode = sync_mode,
- .nr_to_write = mapping->nrpages * 2,
- .range_start = start,
- .range_end = end,
- };
- return btrfs_writepages(mapping, &wbc);
-}
-
-/**
- * taken from mm/filemap.c because it isn't exported
- *
- * wait_on_page_writeback_range - wait for writeback to complete
- * @mapping: target address_space
- * @start: beginning page index
- * @end: ending page index
- *
- * Wait for writeback to complete against pages indexed by start->end
- * inclusive
- */
-int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
- pgoff_t start, pgoff_t end)
-{
- struct pagevec pvec;
- int nr_pages;
- int ret = 0;
- pgoff_t index;
-
- if (end < start)
- return 0;
-
- pagevec_init(&pvec, 0);
- index = start;
- while ((index <= end) &&
- (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
- PAGECACHE_TAG_WRITEBACK,
- min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
- unsigned i;
-
- for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
-
- /* until radix tree lookup accepts end_index */
- if (page->index > end)
- continue;
-
- wait_on_page_writeback(page);
- if (PageError(page))
- ret = -EIO;
- }
- pagevec_release(&pvec);
- cond_resched();
- }
-
- /* Check for outstanding write errors */
- if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
- ret = -ENOSPC;
- if (test_and_clear_bit(AS_EIO, &mapping->flags))
- ret = -EIO;
-
- return ret;
-}
-
/*
* add a given inode to the list of inodes that must be fully on
* disk before a transaction commit finishes.
Index: linux-2.6/fs/btrfs/ordered-data.h
===================================================================
--- linux-2.6.orig/fs/btrfs/ordered-data.h 2009-09-30 13:44:52.435256184 -0300
+++ linux-2.6/fs/btrfs/ordered-data.h 2009-09-30 13:56:56.757294667 -0300
@@ -153,10 +153,6 @@ btrfs_lookup_first_ordered_extent(struct
int btrfs_ordered_update_i_size(struct inode *inode,
struct btrfs_ordered_extent *ordered);
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
-int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
- pgoff_t start, pgoff_t end);
-int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
- loff_t end, int sync_mode);
int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
int btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
Index: linux-2.6/fs/btrfs/file.c
===================================================================
--- linux-2.6.orig/fs/btrfs/file.c 2009-09-30 13:44:52.445277991 -0300
+++ linux-2.6/fs/btrfs/file.c 2009-09-30 13:56:56.766254537 -0300
@@ -1005,9 +1005,8 @@ static ssize_t btrfs_file_write(struct f
}

if (will_write) {
- btrfs_fdatawrite_range(inode->i_mapping, pos,
- pos + write_bytes - 1,
- WB_SYNC_ALL);
+ filemap_fdatawrite_range(inode->i_mapping, pos,
+ pos + write_bytes - 1);
} else {
balance_dirty_pages_ratelimited_nr(inode->i_mapping,
num_pages);