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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/buffer_head.h
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@@ -22,9 +22,6 @@
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 	BH_Dirty,	/* Is dirty */
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 	BH_Lock,	/* Is locked */
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 	BH_Req,		/* Has been submitted for I/O */
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-	BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise
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-			  * IO completion of other buffers in the page
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-			  */
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 	BH_Mapped,	/* Has a disk mapping */
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 	BH_New,		/* Disk mapping was newly created by get_block */
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@@ -76,49 +73,10 @@
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 	struct address_space *b_assoc_map;	/* mapping this buffer is
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 						   associated with */
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 	atomic_t b_count;		/* users using this buffer_head */
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-#ifdef CONFIG_PREEMPT_RT_BASE
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-	spinlock_t b_uptodate_lock;
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-#if IS_ENABLED(CONFIG_JBD2)
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-	spinlock_t b_state_lock;
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-	spinlock_t b_journal_head_lock;
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-#endif
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-#endif
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+	spinlock_t b_uptodate_lock;	/* Used by the first bh in a page, to
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+					 * serialise IO completion of other
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+					 * buffers in the page */
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 };
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-
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-static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh)
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-{
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-	unsigned long flags;
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-
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-#ifndef CONFIG_PREEMPT_RT_BASE
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-	local_irq_save(flags);
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-	bit_spin_lock(BH_Uptodate_Lock, &bh->b_state);
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-#else
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-	spin_lock_irqsave(&bh->b_uptodate_lock, flags);
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-#endif
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-	return flags;
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-}
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-
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-static inline void
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-bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags)
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-{
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-#ifndef CONFIG_PREEMPT_RT_BASE
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-	bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state);
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-	local_irq_restore(flags);
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-#else
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-	spin_unlock_irqrestore(&bh->b_uptodate_lock, flags);
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-#endif
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-}
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-
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-static inline void buffer_head_init_locks(struct buffer_head *bh)
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-{
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-#ifdef CONFIG_PREEMPT_RT_BASE
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-	spin_lock_init(&bh->b_uptodate_lock);
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-#if IS_ENABLED(CONFIG_JBD2)
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-	spin_lock_init(&bh->b_state_lock);
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-	spin_lock_init(&bh->b_journal_head_lock);
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-#endif
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-#endif
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-}
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 /*
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  * macro tricks to expand the set_buffer_foo(), clear_buffer_foo()
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@@ -159,7 +117,6 @@
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  * of the form "mark_buffer_foo()".  These are higher-level functions which
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  * do something in addition to setting a b_state bit.
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  */
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-BUFFER_FNS(Uptodate, uptodate)
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 BUFFER_FNS(Dirty, dirty)
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 TAS_BUFFER_FNS(Dirty, dirty)
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 BUFFER_FNS(Lock, locked)
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@@ -176,6 +133,41 @@
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 BUFFER_FNS(Meta, meta)
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 BUFFER_FNS(Prio, prio)
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 BUFFER_FNS(Defer_Completion, defer_completion)
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+
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+static __always_inline void set_buffer_uptodate(struct buffer_head *bh)
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+{
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+	/*
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+	 * If somebody else already set this uptodate, they will
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+	 * have done the memory barrier, and a reader will thus
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+	 * see *some* valid buffer state.
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+	 *
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+	 * Any other serialization (with IO errors or whatever that
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+	 * might clear the bit) has to come from other state (eg BH_Lock).
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+	 */
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+	if (test_bit(BH_Uptodate, &bh->b_state))
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+		return;
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+
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+	/*
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+	 * make it consistent with folio_mark_uptodate
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+	 * pairs with smp_load_acquire in buffer_uptodate
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+	 */
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+	smp_mb__before_atomic();
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+	set_bit(BH_Uptodate, &bh->b_state);
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+}
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+
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+static __always_inline void clear_buffer_uptodate(struct buffer_head *bh)
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+{
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+	clear_bit(BH_Uptodate, &bh->b_state);
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+}
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+
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+static __always_inline int buffer_uptodate(const struct buffer_head *bh)
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+{
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+	/*
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+	 * make it consistent with folio_test_uptodate
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+	 * pairs with smp_mb__before_atomic in set_buffer_uptodate
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+	 */
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+	return (smp_load_acquire(&bh->b_state) & (1UL << BH_Uptodate)) != 0;
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+}
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 #define bh_offset(bh)		((unsigned long)(bh)->b_data & ~PAGE_MASK)
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@@ -236,6 +228,8 @@
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 struct buffer_head *__bread_gfp(struct block_device *,
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 				sector_t block, unsigned size, gfp_t gfp);
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 void invalidate_bh_lrus(void);
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+void invalidate_bh_lrus_cpu(void);
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+bool has_bh_in_lru(int cpu, void *dummy);
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 struct buffer_head *alloc_buffer_head(gfp_t gfp_flags);
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 void free_buffer_head(struct buffer_head * bh);
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 void unlock_buffer(struct buffer_head *bh);
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@@ -286,7 +280,7 @@
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 int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
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 				get_block_t get_block);
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 /* Convert errno to return value from ->page_mkwrite() call */
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-static inline int block_page_mkwrite_return(int err)
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+static inline vm_fault_t block_page_mkwrite_return(int err)
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 {
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 	if (err == 0)
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 		return VM_FAULT_LOCKED;
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@@ -313,14 +307,6 @@
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 /*
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  * inline definitions
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  */
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-
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-static inline void attach_page_buffers(struct page *page,
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-		struct buffer_head *head)
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-{
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-	get_page(page);
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-	SetPagePrivate(page);
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-	set_page_private(page, (unsigned long)head);
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-}
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 static inline void get_bh(struct buffer_head *bh)
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 {
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@@ -456,6 +442,9 @@
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 static inline void invalidate_inode_buffers(struct inode *inode) {}
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 static inline int remove_inode_buffers(struct inode *inode) { return 1; }
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 static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
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+static inline void invalidate_bh_lrus_cpu(void) {}
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+static inline bool has_bh_in_lru(int cpu, void *dummy) { return 0; }
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+#define buffer_heads_over_limit 0
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 #endif /* CONFIG_BLOCK */
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 #endif /* _LINUX_BUFFER_HEAD_H */