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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/writeback.h
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@@ -11,6 +11,7 @@
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 #include <linux/flex_proportions.h>
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 #include <linux/backing-dev-defs.h>
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 #include <linux/blk_types.h>
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+#include <linux/blk-cgroup.h>
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 struct bio;
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@@ -68,6 +69,17 @@
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 	unsigned for_reclaim:1;		/* Invoked from the page allocator */
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 	unsigned range_cyclic:1;	/* range_start is cyclic */
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 	unsigned for_sync:1;		/* sync(2) WB_SYNC_ALL writeback */
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+
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+	/*
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+	 * When writeback IOs are bounced through async layers, only the
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+	 * initial synchronous phase should be accounted towards inode
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+	 * cgroup ownership arbitration to avoid confusion.  Later stages
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+	 * can set the following flag to disable the accounting.
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+	 */
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+	unsigned no_cgroup_owner:1;
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+
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+	unsigned punt_to_cgroup:1;	/* cgrp punting, see __REQ_CGROUP_PUNT */
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+
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 #ifdef CONFIG_CGROUP_WRITEBACK
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 	struct bdi_writeback *wb;	/* wb this writeback is issued under */
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 	struct inode *inode;		/* inode being written out */
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@@ -84,12 +96,27 @@
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 static inline int wbc_to_write_flags(struct writeback_control *wbc)
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 {
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-	if (wbc->sync_mode == WB_SYNC_ALL)
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-		return REQ_SYNC;
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-	else if (wbc->for_kupdate || wbc->for_background)
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-		return REQ_BACKGROUND;
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+	int flags = 0;
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-	return 0;
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+	if (wbc->punt_to_cgroup)
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+		flags = REQ_CGROUP_PUNT;
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+
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+	if (wbc->sync_mode == WB_SYNC_ALL)
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+		flags |= REQ_SYNC;
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+	else if (wbc->for_kupdate || wbc->for_background)
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+		flags |= REQ_BACKGROUND;
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+
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+	return flags;
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+}
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+
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+static inline struct cgroup_subsys_state *
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+wbc_blkcg_css(struct writeback_control *wbc)
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+{
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+#ifdef CONFIG_CGROUP_WRITEBACK
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+	if (wbc->wb)
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+		return wbc->wb->blkcg_css;
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+#endif
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+	return blkcg_root_css;
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 }
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 /*
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@@ -170,6 +197,7 @@
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 void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
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 				enum wb_reason reason);
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 void inode_wait_for_writeback(struct inode *inode);
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+void inode_io_list_del(struct inode *inode);
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 /* writeback.h requires fs.h; it, too, is not included from here. */
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 static inline void wait_on_inode(struct inode *inode)
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@@ -188,8 +216,10 @@
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 				 struct inode *inode)
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 	__releases(&inode->i_lock);
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 void wbc_detach_inode(struct writeback_control *wbc);
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-void wbc_account_io(struct writeback_control *wbc, struct page *page,
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-		    size_t bytes);
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+void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
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+			      size_t bytes);
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+int cgroup_writeback_by_id(u64 bdi_id, int memcg_id, unsigned long nr_pages,
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+			   enum wb_reason reason, struct wb_completion *done);
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 void cgroup_writeback_umount(void);
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 /**
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@@ -246,7 +276,8 @@
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  *
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  * @bio is a part of the writeback in progress controlled by @wbc.  Perform
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  * writeback specific initialization.  This is used to apply the cgroup
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- * writeback context.
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+ * writeback context.  Must be called after the bio has been associated with
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+ * a device.
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  */
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 static inline void wbc_init_bio(struct writeback_control *wbc, struct bio *bio)
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 {
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@@ -257,7 +288,7 @@
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 	 * regular writeback instead of writing things out itself.
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 	 */
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 	if (wbc->wb)
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-		bio_associate_blkcg(bio, wbc->wb->blkcg_css);
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+		bio_associate_blkg_from_css(bio, wbc->wb->blkcg_css);
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 }
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 #else	/* CONFIG_CGROUP_WRITEBACK */
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@@ -290,8 +321,8 @@
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 {
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 }
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-static inline void wbc_account_io(struct writeback_control *wbc,
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-				  struct page *page, size_t bytes)
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+static inline void wbc_account_cgroup_owner(struct writeback_control *wbc,
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+					    struct page *page, size_t bytes)
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 {
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 }
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@@ -332,24 +363,18 @@
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 extern int block_dump;
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 extern int laptop_mode;
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365
 
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-extern int dirty_background_ratio_handler(struct ctl_table *table, int write,
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-		void __user *buffer, size_t *lenp,
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-		loff_t *ppos);
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-extern int dirty_background_bytes_handler(struct ctl_table *table, int write,
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-		void __user *buffer, size_t *lenp,
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-		loff_t *ppos);
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-extern int dirty_ratio_handler(struct ctl_table *table, int write,
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-		void __user *buffer, size_t *lenp,
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-		loff_t *ppos);
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-extern int dirty_bytes_handler(struct ctl_table *table, int write,
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-		void __user *buffer, size_t *lenp,
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-		loff_t *ppos);
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+int dirty_background_ratio_handler(struct ctl_table *table, int write,
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+		void *buffer, size_t *lenp, loff_t *ppos);
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+int dirty_background_bytes_handler(struct ctl_table *table, int write,
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+		void *buffer, size_t *lenp, loff_t *ppos);
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+int dirty_ratio_handler(struct ctl_table *table, int write,
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+		void *buffer, size_t *lenp, loff_t *ppos);
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+int dirty_bytes_handler(struct ctl_table *table, int write,
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+		void *buffer, size_t *lenp, loff_t *ppos);
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 int dirtytime_interval_handler(struct ctl_table *table, int write,
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-			       void __user *buffer, size_t *lenp, loff_t *ppos);
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-
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-struct ctl_table;
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-int dirty_writeback_centisecs_handler(struct ctl_table *, int,
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-				      void __user *, size_t *, loff_t *);
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+		void *buffer, size_t *lenp, loff_t *ppos);
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+int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
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+		void *buffer, size_t *lenp, loff_t *ppos);
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 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
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 unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);