add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/xfs/xfs_buf.h
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@@ -18,14 +18,9 @@
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 /*
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  *	Base types
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  */
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+struct xfs_buf;
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 #define XFS_BUF_DADDR_NULL	((xfs_daddr_t) (-1LL))
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-
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-typedef enum {
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-	XBRW_READ = 1,			/* transfer into target memory */
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-	XBRW_WRITE = 2,			/* transfer from target memory */
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-	XBRW_ZERO = 3,			/* Zero target memory */
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-} xfs_buf_rw_t;
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 #define XBF_READ	 (1 << 0) /* buffer intended for reading from device */
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 #define XBF_WRITE	 (1 << 1) /* buffer intended for writing to device */
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@@ -34,22 +29,21 @@
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 #define XBF_ASYNC	 (1 << 4) /* initiator will not wait for completion */
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 #define XBF_DONE	 (1 << 5) /* all pages in the buffer uptodate */
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 #define XBF_STALE	 (1 << 6) /* buffer has been staled, do not find it */
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-#define XBF_WRITE_FAIL	 (1 << 24)/* async writes have failed on this buffer */
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+#define XBF_WRITE_FAIL	 (1 << 7) /* async writes have failed on this buffer */
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-/* I/O hints for the BIO layer */
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-#define XBF_SYNCIO	 (1 << 10)/* treat this buffer as synchronous I/O */
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-#define XBF_FUA		 (1 << 11)/* force cache write through mode */
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-#define XBF_FLUSH	 (1 << 12)/* flush the disk cache before a write */
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-
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-/* flags used only as arguments to access routines */
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-#define XBF_TRYLOCK	 (1 << 16)/* lock requested, but do not wait */
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-#define XBF_UNMAPPED	 (1 << 17)/* do not map the buffer */
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+/* buffer type flags for write callbacks */
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+#define _XBF_INODES	 (1 << 16)/* inode buffer */
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+#define _XBF_DQUOTS	 (1 << 17)/* dquot buffer */
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+#define _XBF_LOGRECOVERY	 (1 << 18)/* log recovery buffer */
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 /* flags used only internally */
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 #define _XBF_PAGES	 (1 << 20)/* backed by refcounted pages */
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 #define _XBF_KMEM	 (1 << 21)/* backed by heap memory */
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 #define _XBF_DELWRI_Q	 (1 << 22)/* buffer on a delwri queue */
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-#define _XBF_COMPOUND	 (1 << 23)/* compound buffer */
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+
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+/* flags used only as arguments to access routines */
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+#define XBF_TRYLOCK	 (1 << 30)/* lock requested, but do not wait */
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+#define XBF_UNMAPPED	 (1 << 31)/* do not map the buffer */
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 typedef unsigned int xfs_buf_flags_t;
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49
 
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@@ -62,16 +56,15 @@
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 	{ XBF_DONE,		"DONE" }, \
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 	{ XBF_STALE,		"STALE" }, \
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 	{ XBF_WRITE_FAIL,	"WRITE_FAIL" }, \
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-	{ XBF_SYNCIO,		"SYNCIO" }, \
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-	{ XBF_FUA,		"FUA" }, \
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-	{ XBF_FLUSH,		"FLUSH" }, \
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-	{ XBF_TRYLOCK,		"TRYLOCK" },	/* should never be set */\
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-	{ XBF_UNMAPPED,		"UNMAPPED" },	/* ditto */\
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+	{ _XBF_INODES,		"INODES" }, \
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+	{ _XBF_DQUOTS,		"DQUOTS" }, \
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+	{ _XBF_LOGRECOVERY,		"LOG_RECOVERY" }, \
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 	{ _XBF_PAGES,		"PAGES" }, \
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 	{ _XBF_KMEM,		"KMEM" }, \
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 	{ _XBF_DELWRI_Q,	"DELWRI_Q" }, \
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-	{ _XBF_COMPOUND,	"COMPOUND" }
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-
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+	/* The following interface flags should never be set */ \
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+	{ XBF_TRYLOCK,		"TRYLOCK" }, \
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+	{ XBF_UNMAPPED,		"UNMAPPED" }
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 /*
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  * Internal state flags.
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@@ -107,11 +100,8 @@
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 	struct list_lru		bt_lru;
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 	struct percpu_counter	bt_io_count;
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+	struct ratelimit_state	bt_ioerror_rl;
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 } xfs_buftarg_t;
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-
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-struct xfs_buf;
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-typedef void (*xfs_buf_iodone_t)(struct xfs_buf *);
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-
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 #define XB_PAGES	2
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@@ -125,6 +115,10 @@
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 struct xfs_buf_ops {
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 	char *name;
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+	union {
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+		__be32 magic[2];	/* v4 and v5 on disk magic values */
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+		__be16 magic16[2];	/* v4 and v5 on disk magic values */
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+	};
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 	void (*verify_read)(struct xfs_buf *);
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 	void (*verify_write)(struct xfs_buf *);
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 	xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp);
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@@ -157,13 +151,12 @@
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 	wait_queue_head_t	b_waiters;	/* unpin waiters */
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 	struct list_head	b_list;
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 	struct xfs_perag	*b_pag;		/* contains rbtree root */
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+	struct xfs_mount	*b_mount;
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 	xfs_buftarg_t		*b_target;	/* buffer target (device) */
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 	void			*b_addr;	/* virtual address of buffer */
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 	struct work_struct	b_ioend_work;
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-	struct workqueue_struct	*b_ioend_wq;	/* I/O completion wq */
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-	xfs_buf_iodone_t	b_iodone;	/* I/O completion function */
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 	struct completion	b_iowait;	/* queue for I/O waiters */
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-	void			*b_log_item;
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+	struct xfs_buf_log_item	*b_log_item;
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 	struct list_head	b_li_list;	/* Log items list head */
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 	struct xfs_trans	*b_transp;
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 	struct page		**b_pages;	/* array of page pointers */
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@@ -171,7 +164,6 @@
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 	struct xfs_buf_map	*b_maps;	/* compound buffer map */
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 	struct xfs_buf_map	__b_map;	/* inline compound buffer map */
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 	int			b_map_count;
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-	int			b_io_length;	/* IO size in BBs */
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 	atomic_t		b_pin_count;	/* pin count */
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 	atomic_t		b_io_remaining;	/* #outstanding I/O requests */
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 	unsigned int		b_page_count;	/* size of page array */
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@@ -205,53 +197,40 @@
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 			   xfs_daddr_t blkno, size_t numblks,
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 			   xfs_buf_flags_t flags);
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-struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
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-			       struct xfs_buf_map *map, int nmaps,
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-			       xfs_buf_flags_t flags);
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-
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-static inline struct xfs_buf *
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-xfs_buf_alloc(
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-	struct xfs_buftarg	*target,
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-	xfs_daddr_t		blkno,
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-	size_t			numblks,
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-	xfs_buf_flags_t		flags)
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-{
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-	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
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-	return _xfs_buf_alloc(target, &map, 1, flags);
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-}
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-
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-struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
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-			       struct xfs_buf_map *map, int nmaps,
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-			       xfs_buf_flags_t flags);
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-struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
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-			       struct xfs_buf_map *map, int nmaps,
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-			       xfs_buf_flags_t flags,
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-			       const struct xfs_buf_ops *ops);
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+int xfs_buf_get_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
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+		int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp);
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+int xfs_buf_read_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
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+		int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp,
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+		const struct xfs_buf_ops *ops, xfs_failaddr_t fa);
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 void xfs_buf_readahead_map(struct xfs_buftarg *target,
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 			       struct xfs_buf_map *map, int nmaps,
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 			       const struct xfs_buf_ops *ops);
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-static inline struct xfs_buf *
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+static inline int
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 xfs_buf_get(
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 	struct xfs_buftarg	*target,
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 	xfs_daddr_t		blkno,
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 	size_t			numblks,
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-	xfs_buf_flags_t		flags)
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+	struct xfs_buf		**bpp)
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 {
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 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
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-	return xfs_buf_get_map(target, &map, 1, flags);
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+
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+	return xfs_buf_get_map(target, &map, 1, 0, bpp);
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 }
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-static inline struct xfs_buf *
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+static inline int
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 xfs_buf_read(
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 	struct xfs_buftarg	*target,
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 	xfs_daddr_t		blkno,
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 	size_t			numblks,
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 	xfs_buf_flags_t		flags,
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+	struct xfs_buf		**bpp,
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 	const struct xfs_buf_ops *ops)
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 {
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 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
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-	return xfs_buf_read_map(target, &map, 1, flags, ops);
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+
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+	return xfs_buf_read_map(target, &map, 1, flags, bpp, ops,
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+			__builtin_return_address(0));
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 }
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 static inline void
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@@ -265,18 +244,15 @@
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 	return xfs_buf_readahead_map(target, &map, 1, ops);
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 }
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-void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
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-int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
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-
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-struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
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-				int flags);
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+int xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks, int flags,
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+		struct xfs_buf **bpp);
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 int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
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 			  size_t numblks, int flags, struct xfs_buf **bpp,
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 			  const struct xfs_buf_ops *ops);
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+int _xfs_buf_read(struct xfs_buf *bp, xfs_buf_flags_t flags);
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 void xfs_buf_hold(struct xfs_buf *bp);
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 /* Releasing Buffers */
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-extern void xfs_buf_free(xfs_buf_t *);
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 extern void xfs_buf_rele(xfs_buf_t *);
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 /* Locking and Unlocking Buffers */
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@@ -286,25 +262,23 @@
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 #define xfs_buf_islocked(bp) \
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 	((bp)->b_sema.count <= 0)
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+static inline void xfs_buf_relse(xfs_buf_t *bp)
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+{
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+	xfs_buf_unlock(bp);
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+	xfs_buf_rele(bp);
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+}
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+
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 /* Buffer Read and Write Routines */
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 extern int xfs_bwrite(struct xfs_buf *bp);
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-extern void xfs_buf_ioend(struct xfs_buf *bp);
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+
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 extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error,
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 		xfs_failaddr_t failaddr);
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 #define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address)
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-extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func);
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-
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-extern int __xfs_buf_submit(struct xfs_buf *bp, bool);
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-static inline int xfs_buf_submit(struct xfs_buf *bp)
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-{
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-	bool wait = bp->b_flags & XBF_ASYNC ? false : true;
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-	return __xfs_buf_submit(bp, wait);
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-}
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-
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-extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
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-				xfs_buf_rw_t);
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-#define xfs_buf_zero(bp, off, len) \
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-	    xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
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+extern void xfs_buf_ioerror_alert(struct xfs_buf *bp, xfs_failaddr_t fa);
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+void xfs_buf_ioend_fail(struct xfs_buf *);
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+void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize);
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+void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa);
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+#define xfs_buf_mark_corrupt(bp) __xfs_buf_mark_corrupt((bp), __this_address)
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 /* Buffer Utility Routines */
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 extern void *xfs_buf_offset(struct xfs_buf *, size_t);
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@@ -353,12 +327,6 @@
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 	return atomic_read(&bp->b_pin_count);
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 }
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-static inline void xfs_buf_relse(xfs_buf_t *bp)
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-{
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-	xfs_buf_unlock(bp);
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-	xfs_buf_rele(bp);
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-}
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-
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 static inline int
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 xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
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 {
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@@ -385,4 +353,14 @@
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 #define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
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 #define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)
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+static inline int
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+xfs_buftarg_dma_alignment(struct xfs_buftarg *bt)
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+{
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+	return queue_dma_alignment(bt->bt_bdev->bd_disk->queue);
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+}
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+
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+int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops);
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+bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic);
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+bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic);
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+
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 #endif	/* __XFS_BUF_H__ */