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mm: remove BDI_CAP_WRITEBACK_ACCT

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There are no users of BDI_CAP_WRITEBACK_ACCT now that fuse doesn't do
its own writeback accounting. This commit removes
BDI_CAP_WRITEBACK_ACCT.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Joanne Koong 2025-07-07 16:46:06 -07:00 committed by Miklos Szeredi
parent 494d2f5088
commit 2841808f35
3 changed files with 20 additions and 29 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/backing-dev.h
View file

@ -108,12 +108,10 @@ int bdi_set_strict_limit(struct backing_dev_info *bdi, unsigned int strict_limit
*
* BDI_CAP_WRITEBACK: Supports dirty page writeback, and dirty pages
* should contribute to accounting
* BDI_CAP_WRITEBACK_ACCT: Automatically account writeback pages
* BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold
*/
#define BDI_CAP_WRITEBACK (1 << 0)
#define BDI_CAP_WRITEBACK_ACCT (1 << 1)
#define BDI_CAP_STRICTLIMIT (1 << 2)
#define BDI_CAP_STRICTLIMIT (1 << 1)
extern struct backing_dev_info noop_backing_dev_info;

2
mm/backing-dev.c
View file

@ -1026,7 +1026,7 @@ struct backing_dev_info *bdi_alloc(int node_id)
kfree(bdi);
return NULL;
}
bdi->capabilities = BDI_CAP_WRITEBACK | BDI_CAP_WRITEBACK_ACCT;
bdi->capabilities = BDI_CAP_WRITEBACK;
bdi->ra_pages = VM_READAHEAD_PAGES;
bdi->io_pages = VM_READAHEAD_PAGES;
timer_setup(&bdi->laptop_mode_wb_timer, laptop_mode_timer_fn, 0);

43
mm/page-writeback.c
View file

@ -3014,26 +3014,22 @@ bool __folio_end_writeback(struct folio *folio)
if (mapping && mapping_use_writeback_tags(mapping)) {
struct inode *inode = mapping->host;
struct backing_dev_info *bdi = inode_to_bdi(inode);
struct bdi_writeback *wb = inode_to_wb(inode);
unsigned long flags;
xa_lock_irqsave(&mapping->i_pages, flags);
ret = folio_xor_flags_has_waiters(folio, 1 << PG_writeback);
__xa_clear_mark(&mapping->i_pages, folio_index(folio),
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);
__wb_writeout_add(wb, nr);
if (!mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
wb_inode_writeback_end(wb);
wb_stat_mod(wb, WB_WRITEBACK, -nr);
__wb_writeout_add(wb, nr);
if (!mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
wb_inode_writeback_end(wb);
if (mapping->host)
sb_clear_inode_writeback(mapping->host);
}
if (mapping->host && !mapping_tagged(mapping,
PAGECACHE_TAG_WRITEBACK))
sb_clear_inode_writeback(mapping->host);
xa_unlock_irqrestore(&mapping->i_pages, flags);
} else {
ret = folio_xor_flags_has_waiters(folio, 1 << PG_writeback);
@ -3058,7 +3054,7 @@ void __folio_start_writeback(struct folio *folio, bool keep_write)
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);
struct bdi_writeback *wb = inode_to_wb(inode);
unsigned long flags;
bool on_wblist;
@ -3069,21 +3065,18 @@ void __folio_start_writeback(struct folio *folio, bool keep_write)
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);
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)
sb_mark_inode_writeback(mapping->host);
}
/*
* 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)