On Thu 10-09-20 16:48:31, Christoph Hellwig wrote: > 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: Christoph Hellwig <[email protected]>
The patch looks good to me. You can add: Reviewed-by: Jan Kara <[email protected]> Honza > --- > fs/fuse/inode.c | 3 ++- > include/linux/backing-dev.h | 13 +++---------- > mm/backing-dev.c | 1 + > mm/page-writeback.c | 4 ++-- > 4 files changed, 8 insertions(+), 13 deletions(-) > > diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c > index 17b00670fb539e..581329203d6860 100644 > --- a/fs/fuse/inode.c > +++ b/fs/fuse/inode.c > @@ -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 + > diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h > index 5da4ea3dd0cc5c..b217344a2c63be 100644 > --- a/include/linux/backing-dev.h > +++ b/include/linux/backing-dev.h > @@ -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)); > diff --git a/mm/backing-dev.c b/mm/backing-dev.c > index f9a2842bd81c3d..ab0415dde5c66c 100644 > --- a/mm/backing-dev.c > +++ b/mm/backing-dev.c > @@ -744,6 +744,7 @@ 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; > diff --git a/mm/page-writeback.c b/mm/page-writeback.c > index e9c36521461aaa..0139f9622a92da 100644 > --- a/mm/page-writeback.c > +++ b/mm/page-writeback.c > @@ -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); > > /* > -- > 2.28.0 > -- Jan Kara <[email protected]> SUSE Labs, CR -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
