path: root/mm/page-writeback.c
diff options
authorChristoph Hellwig <>2020-09-24 08:51:38 +0200
committerJens Axboe <>2020-09-24 13:43:39 -0600
commit1cb039f3dc1619eb795c54aad0a98fdb379b4237 (patch)
treef2fbc89b26bd404d4f31b66b258e5ca08a5d9070 /mm/page-writeback.c
parent5115db10a8e0a525edf8a65b2ed4eac5c8253095 (diff)
bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag
The BDI_CAP_STABLE_WRITES is one of the few bits of information in the backing_dev_info shared between the block drivers and the writeback code. To help untangling the dependency replace it with a queue flag and a superblock flag derived from it. This also helps with the case of e.g. a file system requiring stable writes due to its own checksumming, but not forcing it on other users of the block device like the swap code. One downside is that we an't support the stable_pages_required bdi attribute in sysfs anymore. It is replaced with a queue attribute which also is writable for easier testing. Signed-off-by: Christoph Hellwig <> Reviewed-by: Jan Kara <> Reviewed-by: Johannes Thumshirn <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'mm/page-writeback.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 4e4ddd67b71e..e9c36521461a 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2849,7 +2849,7 @@ EXPORT_SYMBOL_GPL(wait_on_page_writeback);
void wait_for_stable_page(struct page *page)
- if (bdi_cap_stable_pages_required(inode_to_bdi(page->mapping->host)))
+ if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)