The quilt patch titled
Subject: mm: return void from folio_start_writeback() and related functions
has been removed from the -mm tree. Its filename was
mm-return-void-from-folio_start_writeback-and-related-functions.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: return void from folio_start_writeback() and related functions
Date: Wed, 8 Nov 2023 20:46:05 +0000
Nobody now checks the return value from any of these functions, so
add an assertion at the beginning of the function and return void.
Link: https://lkml.kernel.org/r/20231108204605.745109-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Steve French <sfrench@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 4 +-
mm/folio-compat.c | 4 +-
mm/page-writeback.c | 60 ++++++++++++++++-------------------
3 files changed, 32 insertions(+), 36 deletions(-)
--- a/include/linux/page-flags.h~mm-return-void-from-folio_start_writeback-and-related-functions
+++ a/include/linux/page-flags.h
@@ -772,8 +772,8 @@ static __always_inline void SetPageUptod
CLEARPAGEFLAG(Uptodate, uptodate, PF_NO_TAIL)
-bool __folio_start_writeback(struct folio *folio, bool keep_write);
-bool set_page_writeback(struct page *page);
+void __folio_start_writeback(struct folio *folio, bool keep_write);
+void set_page_writeback(struct page *page);
#define folio_start_writeback(folio) \
__folio_start_writeback(folio, false)
--- a/mm/folio-compat.c~mm-return-void-from-folio_start_writeback-and-related-functions
+++ a/mm/folio-compat.c
@@ -46,9 +46,9 @@ void mark_page_accessed(struct page *pag
}
EXPORT_SYMBOL(mark_page_accessed);
-bool set_page_writeback(struct page *page)
+void set_page_writeback(struct page *page)
{
- return folio_start_writeback(page_folio(page));
+ folio_start_writeback(page_folio(page));
}
EXPORT_SYMBOL(set_page_writeback);
--- a/mm/page-writeback.c~mm-return-void-from-folio_start_writeback-and-related-functions
+++ a/mm/page-writeback.c
@@ -2982,67 +2982,63 @@ bool __folio_end_writeback(struct folio
return ret;
}
-bool __folio_start_writeback(struct folio *folio, bool keep_write)
+void __folio_start_writeback(struct folio *folio, bool keep_write)
{
long nr = folio_nr_pages(folio);
struct address_space *mapping = folio_mapping(folio);
- bool ret;
int access_ret;
+ VM_BUG_ON_FOLIO(folio_test_writeback(folio), folio);
+
folio_memcg_lock(folio);
if (mapping && mapping_use_writeback_tags(mapping)) {
XA_STATE(xas, &mapping->i_pages, folio_index(folio));
struct inode *inode = mapping->host;
struct backing_dev_info *bdi = inode_to_bdi(inode);
unsigned long flags;
+ bool on_wblist;
xas_lock_irqsave(&xas, flags);
xas_load(&xas);
- ret = folio_test_set_writeback(folio);
- if (!ret) {
- bool on_wblist;
-
- on_wblist = mapping_tagged(mapping,
- PAGECACHE_TAG_WRITEBACK);
-
- xas_set_mark(&xas, PAGECACHE_TAG_WRITEBACK);
- if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT) {
- struct bdi_writeback *wb = inode_to_wb(inode);
-
- wb_stat_mod(wb, WB_WRITEBACK, nr);
- if (!on_wblist)
- wb_inode_writeback_start(wb);
- }
-
- /*
- * We can come through here when swapping
- * anonymous folios, so we don't necessarily
- * have an inode to track for sync.
- */
- if (mapping->host && !on_wblist)
- sb_mark_inode_writeback(mapping->host);
+ folio_test_set_writeback(folio);
+
+ on_wblist = mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK);
+
+ xas_set_mark(&xas, PAGECACHE_TAG_WRITEBACK);
+ if (bdi->capabilities & BDI_CAP_WRITEBACK_ACCT) {
+ struct bdi_writeback *wb = inode_to_wb(inode);
+
+ wb_stat_mod(wb, WB_WRITEBACK, nr);
+ if (!on_wblist)
+ wb_inode_writeback_start(wb);
}
+
+ /*
+ * We can come through here when swapping anonymous
+ * folios, so we don't necessarily have an inode to
+ * track for sync.
+ */
+ if (mapping->host && !on_wblist)
+ sb_mark_inode_writeback(mapping->host);
if (!folio_test_dirty(folio))
xas_clear_mark(&xas, PAGECACHE_TAG_DIRTY);
if (!keep_write)
xas_clear_mark(&xas, PAGECACHE_TAG_TOWRITE);
xas_unlock_irqrestore(&xas, flags);
} else {
- ret = folio_test_set_writeback(folio);
- }
- if (!ret) {
- lruvec_stat_mod_folio(folio, NR_WRITEBACK, nr);
- zone_stat_mod_folio(folio, NR_ZONE_WRITE_PENDING, nr);
+ folio_test_set_writeback(folio);
}
+
+ lruvec_stat_mod_folio(folio, NR_WRITEBACK, nr);
+ zone_stat_mod_folio(folio, NR_ZONE_WRITE_PENDING, nr);
folio_memcg_unlock(folio);
+
access_ret = arch_make_folio_accessible(folio);
/*
* If writeback has been triggered on a page that cannot be made
* accessible, it is too late to recover here.
*/
VM_BUG_ON_FOLIO(access_ret != 0, folio);
-
- return ret;
}
EXPORT_SYMBOL(__folio_start_writeback);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
buffer-return-bool-from-grow_dev_folio.patch
buffer-calculate-block-number-inside-folio_init_buffers.patch
buffer-fix-grow_buffers-for-block-size-page_size.patch
buffer-cast-block-to-loff_t-before-shifting-it.patch
buffer-fix-various-functions-for-block-size-page_size.patch
buffer-handle-large-folios-in-__block_write_begin_int.patch
buffer-fix-more-functions-for-block-size-page_size.patch
nilfs2-add-nilfs_end_folio_io.patch
nilfs2-convert-nilfs_abort_logs-to-use-folios.patch
nilfs2-convert-nilfs_segctor_complete_write-to-use-folios.patch
nilfs2-convert-nilfs_forget_buffer-to-use-a-folio.patch
nilfs2-convert-to-nilfs_folio_buffers_clean.patch
nilfs2-convert-nilfs_writepage-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_write_page-to-use-a-folio.patch
nilfs2-convert-to-nilfs_clear_folio_dirty.patch
nilfs2-convert-to-__nilfs_clear_folio_dirty.patch
nilfs2-convert-nilfs_segctor_prepare_write-to-use-folios.patch
nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_create_block-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_submit_block-to-use-a-folio.patch
nilfs2-convert-nilfs_gccache_submit_read_data-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_create_block-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_submit_block-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_delete-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_prepare_change_key-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_commit_change_key-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_abort_change_key-to-use-a-folio.patch
nilfs2-remove-page_address-from-nilfs_set_link.patch
nilfs2-remove-page_address-from-nilfs_add_link.patch
nilfs2-remove-page_address-from-nilfs_delete_entry.patch
nilfs2-return-the-mapped-address-from-nilfs_get_page.patch
nilfs2-pass-the-mapped-address-to-nilfs_check_page.patch
nilfs2-switch-to-kmap_local-for-directory-handling.patch
nilfs2-add-nilfs_get_folio.patch
nilfs2-convert-nilfs_readdir-to-use-a-folio.patch
nilfs2-convert-nilfs_find_entry-to-use-a-folio.patch
nilfs2-convert-nilfs_rename-to-use-folios.patch
nilfs2-convert-nilfs_add_link-to-use-a-folio.patch
nilfs2-convert-nilfs_empty_dir-to-use-a-folio.patch
nilfs2-convert-nilfs_make_empty-to-use-a-folio.patch
nilfs2-convert-nilfs_prepare_chunk-and-nilfs_commit_chunk-to-folios.patch
nilfs2-convert-nilfs_page_bug-to-nilfs_folio_bug.patch
