Commit 823423ef authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

bdi: invert BDI_CAP_NO_ACCT_WB 



Replace BDI_CAP_NO_ACCT_WB with a positive BDI_CAP_WRITEBACK_ACCT to
make the checks more obvious.  Also remove the pointless
bdi_cap_account_writeback wrapper that just obsfucates the check.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 1cb039f3

fs/fuse/inode.c

+2 −1
Original line number Diff line number Diff line
@@ -1050,7 +1050,8 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) 
		return err;



	/* fuse does it's own writeback accounting */

	sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;

	sb->s_bdi->capabilities &= ~BDI_CAP_WRITEBACK_ACCT;

	sb->s_bdi->capabilities |= BDI_CAP_STRICTLIMIT;



	/*

	 * For a single fuse filesystem use max 1% of dirty +

include/linux/backing-dev.h

+3 −10
Original line number Diff line number Diff line
@@ -120,17 +120,17 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); 
 *

 * BDI_CAP_NO_ACCT_DIRTY:  Dirty pages shouldn't contribute to accounting

 * BDI_CAP_NO_WRITEBACK:   Don't write pages back

 * BDI_CAP_NO_ACCT_WB:     Don't automatically account writeback pages

 * BDI_CAP_WRITEBACK_ACCT: Automatically account writeback pages

 * BDI_CAP_STRICTLIMIT:    Keep number of dirty pages below bdi threshold.

 */

#define BDI_CAP_NO_ACCT_DIRTY	0x00000001

#define BDI_CAP_NO_WRITEBACK	0x00000002

#define BDI_CAP_NO_ACCT_WB	0x00000004

#define BDI_CAP_WRITEBACK_ACCT	0x00000004

#define BDI_CAP_STRICTLIMIT	0x00000010

#define BDI_CAP_CGROUP_WRITEBACK 0x00000020



#define BDI_CAP_NO_ACCT_AND_WRITEBACK \

	(BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB)

	(BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY)



extern struct backing_dev_info noop_backing_dev_info;
@@ -179,13 +179,6 @@ static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) 
	return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY);

}



static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi)

{

	/* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */

	return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB |

				      BDI_CAP_NO_WRITEBACK));

}



static inline bool mapping_cap_writeback_dirty(struct address_space *mapping)

{

	return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host));

mm/backing-dev.c

+1 −0
Original line number Diff line number Diff line
@@ -745,6 +745,7 @@ struct backing_dev_info *bdi_alloc(int node_id) 
		kfree(bdi);

		return NULL;

	}

	bdi->capabilities = BDI_CAP_WRITEBACK_ACCT;

	bdi->ra_pages = VM_READAHEAD_PAGES;

	bdi->io_pages = VM_READAHEAD_PAGES;

	return bdi;

mm/page-writeback.c

+2 −2
Original line number Diff line number Diff line
@@ -2738,7 +2738,7 @@ int test_clear_page_writeback(struct page *page) 
		if (ret) {

			__xa_clear_mark(&mapping->i_pages, page_index(page),

						PAGECACHE_TAG_WRITEBACK);

			if (bdi_cap_account_writeback(bdi)) {

			if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT) {

				struct bdi_writeback *wb = inode_to_wb(inode);



				dec_wb_stat(wb, WB_WRITEBACK);
@@ -2791,7 +2791,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) 
						   PAGECACHE_TAG_WRITEBACK);



			xas_set_mark(&xas, PAGECACHE_TAG_WRITEBACK);

			if (bdi_cap_account_writeback(bdi))

			if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT)

				inc_wb_stat(inode_to_wb(inode), WB_WRITEBACK);



			/*

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