Commit a8a666d6 authored by Zhang Yi's avatar Zhang Yi
Browse files

iomap: add iomap_is_fully_dirty() 

hulk inclusion
category: perf
bugzilla: https://gitee.com/openeuler/kernel/issues/IACNS4


CVE: NA

--------------------------------

Add a new helper iomap_is_fully_dirty() to check if all blocks which
correspond to the specified part of a folio are dirty.

Signed-off-by: default avatarZhang Yi <yi.zhang@huawei.com>
parent 0b4d2d8f

fs/iomap/buffered-io.c

+31 −0
Original line number Diff line number Diff line
@@ -180,6 +180,37 @@ static void iomap_set_range_dirty(struct folio *folio, size_t off, size_t len) 
		ifs_set_range_dirty(folio, ifs, off, len);

}



/*

 * iomap_is_fully_dirty checks whether blocks within a folio are

 * dirty or not.

 *

 * Returns true if all blocks which correspond to the specified part

 * of the folio are dirty.

 */

bool iomap_is_fully_dirty(struct folio *folio, size_t from, size_t count)

{

	struct iomap_folio_state *ifs = folio->private;

	struct inode *inode = folio->mapping->host;

	unsigned first, last, i;



	if (!ifs)

		return folio_test_dirty(folio);



	/* Caller's range may extend past the end of this folio */

	count = min(folio_size(folio) - from, count);



	/* First and last blocks in range within folio */

	first = from >> inode->i_blkbits;

	last = (from + count - 1) >> inode->i_blkbits;



	for (i = first; i <= last; i++)

		if (!ifs_block_is_dirty(folio, ifs, i))

			return false;



	return true;

}

EXPORT_SYMBOL_GPL(iomap_is_fully_dirty);



static struct iomap_folio_state *ifs_alloc(struct inode *inode,

		struct folio *folio, unsigned int flags)

{

include/linux/iomap.h

+1 −0
Original line number Diff line number Diff line
@@ -269,6 +269,7 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, 
int iomap_read_folio(struct folio *folio, const struct iomap_ops *ops);

void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops);

bool iomap_is_partially_uptodate(struct folio *, size_t from, size_t count);

bool iomap_is_fully_dirty(struct folio *folio, size_t from, size_t count);

struct folio *iomap_get_folio(struct iomap_iter *iter, loff_t pos, size_t len);

bool iomap_release_folio(struct folio *folio, gfp_t gfp_flags);

void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len);