Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 367 insertions, 0 deletions

diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
new file mode 100644
index 000000000..549c60942
--- /dev/null
+++ b/fs/xfs/xfs_buf.h
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_BUF_H__
+#define __XFS_BUF_H__
+
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/dax.h>
+#include <linux/uio.h>
+#include <linux/list_lru.h>
+
+extern struct kmem_cache *xfs_buf_cache;
+
+/*
+ *	Base types
+ */
+struct xfs_buf;
+
+#define XFS_BUF_DADDR_NULL	((xfs_daddr_t) (-1LL))
+
+#define XBF_READ	 (1u << 0) /* buffer intended for reading from device */
+#define XBF_WRITE	 (1u << 1) /* buffer intended for writing to device */
+#define XBF_READ_AHEAD	 (1u << 2) /* asynchronous read-ahead */
+#define XBF_NO_IOACCT	 (1u << 3) /* bypass I/O accounting (non-LRU bufs) */
+#define XBF_ASYNC	 (1u << 4) /* initiator will not wait for completion */
+#define XBF_DONE	 (1u << 5) /* all pages in the buffer uptodate */
+#define XBF_STALE	 (1u << 6) /* buffer has been staled, do not find it */
+#define XBF_WRITE_FAIL	 (1u << 7) /* async writes have failed on this buffer */
+
+/* buffer type flags for write callbacks */
+#define _XBF_INODES	 (1u << 16)/* inode buffer */
+#define _XBF_DQUOTS	 (1u << 17)/* dquot buffer */
+#define _XBF_LOGRECOVERY (1u << 18)/* log recovery buffer */
+
+/* flags used only internally */
+#define _XBF_PAGES	 (1u << 20)/* backed by refcounted pages */
+#define _XBF_KMEM	 (1u << 21)/* backed by heap memory */
+#define _XBF_DELWRI_Q	 (1u << 22)/* buffer on a delwri queue */
+
+/* flags used only as arguments to access routines */
+#define XBF_INCORE	 (1u << 29)/* lookup only, return if found in cache */
+#define XBF_TRYLOCK	 (1u << 30)/* lock requested, but do not wait */
+#define XBF_UNMAPPED	 (1u << 31)/* do not map the buffer */
+
+
+typedef unsigned int xfs_buf_flags_t;
+
+#define XFS_BUF_FLAGS \
+	{ XBF_READ,		"READ" }, \
+	{ XBF_WRITE,		"WRITE" }, \
+	{ XBF_READ_AHEAD,	"READ_AHEAD" }, \
+	{ XBF_NO_IOACCT,	"NO_IOACCT" }, \
+	{ XBF_ASYNC,		"ASYNC" }, \
+	{ XBF_DONE,		"DONE" }, \
+	{ XBF_STALE,		"STALE" }, \
+	{ XBF_WRITE_FAIL,	"WRITE_FAIL" }, \
+	{ _XBF_INODES,		"INODES" }, \
+	{ _XBF_DQUOTS,		"DQUOTS" }, \
+	{ _XBF_LOGRECOVERY,	"LOG_RECOVERY" }, \
+	{ _XBF_PAGES,		"PAGES" }, \
+	{ _XBF_KMEM,		"KMEM" }, \
+	{ _XBF_DELWRI_Q,	"DELWRI_Q" }, \
+	/* The following interface flags should never be set */ \
+	{ XBF_INCORE,		"INCORE" }, \
+	{ XBF_TRYLOCK,		"TRYLOCK" }, \
+	{ XBF_UNMAPPED,		"UNMAPPED" }
+
+/*
+ * Internal state flags.
+ */
+#define XFS_BSTATE_DISPOSE	 (1 << 0)	/* buffer being discarded */
+#define XFS_BSTATE_IN_FLIGHT	 (1 << 1)	/* I/O in flight */
+
+/*
+ * The xfs_buftarg contains 2 notions of "sector size" -
+ *
+ * 1) The metadata sector size, which is the minimum unit and
+ *    alignment of IO which will be performed by metadata operations.
+ * 2) The device logical sector size
+ *
+ * The first is specified at mkfs time, and is stored on-disk in the
+ * superblock's sb_sectsize.
+ *
+ * The latter is derived from the underlying device, and controls direct IO
+ * alignment constraints.
+ */
+typedef struct xfs_buftarg {
+	dev_t			bt_dev;
+	struct block_device	*bt_bdev;
+	struct dax_device	*bt_daxdev;
+	u64			bt_dax_part_off;
+	struct xfs_mount	*bt_mount;
+	unsigned int		bt_meta_sectorsize;
+	size_t			bt_meta_sectormask;
+	size_t			bt_logical_sectorsize;
+	size_t			bt_logical_sectormask;
+
+	/* LRU control structures */
+	struct shrinker		bt_shrinker;
+	struct list_lru		bt_lru;
+
+	struct percpu_counter	bt_io_count;
+	struct ratelimit_state	bt_ioerror_rl;
+} xfs_buftarg_t;
+
+#define XB_PAGES	2
+
+struct xfs_buf_map {
+	xfs_daddr_t		bm_bn;	/* block number for I/O */
+	int			bm_len;	/* size of I/O */
+};
+
+#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
+	struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
+
+struct xfs_buf_ops {
+	char *name;
+	union {
+		__be32 magic[2];	/* v4 and v5 on disk magic values */
+		__be16 magic16[2];	/* v4 and v5 on disk magic values */
+	};
+	void (*verify_read)(struct xfs_buf *);
+	void (*verify_write)(struct xfs_buf *);
+	xfs_failaddr_t (*verify_struct)(struct xfs_buf *bp);
+};
+
+struct xfs_buf {
+	/*
+	 * first cacheline holds all the fields needed for an uncontended cache
+	 * hit to be fully processed. The semaphore straddles the cacheline
+	 * boundary, but the counter and lock sits on the first cacheline,
+	 * which is the only bit that is touched if we hit the semaphore
+	 * fast-path on locking.
+	 */
+	struct rhash_head	b_rhash_head;	/* pag buffer hash node */
+
+	xfs_daddr_t		b_rhash_key;	/* buffer cache index */
+	int			b_length;	/* size of buffer in BBs */
+	atomic_t		b_hold;		/* reference count */
+	atomic_t		b_lru_ref;	/* lru reclaim ref count */
+	xfs_buf_flags_t		b_flags;	/* status flags */
+	struct semaphore	b_sema;		/* semaphore for lockables */
+
+	/*
+	 * concurrent access to b_lru and b_lru_flags are protected by
+	 * bt_lru_lock and not by b_sema
+	 */
+	struct list_head	b_lru;		/* lru list */
+	spinlock_t		b_lock;		/* internal state lock */
+	unsigned int		b_state;	/* internal state flags */
+	int			b_io_error;	/* internal IO error state */
+	wait_queue_head_t	b_waiters;	/* unpin waiters */
+	struct list_head	b_list;
+	struct xfs_perag	*b_pag;		/* contains rbtree root */
+	struct xfs_mount	*b_mount;
+	struct xfs_buftarg	*b_target;	/* buffer target (device) */
+	void			*b_addr;	/* virtual address of buffer */
+	struct work_struct	b_ioend_work;
+	struct completion	b_iowait;	/* queue for I/O waiters */
+	struct xfs_buf_log_item	*b_log_item;
+	struct list_head	b_li_list;	/* Log items list head */
+	struct xfs_trans	*b_transp;
+	struct page		**b_pages;	/* array of page pointers */
+	struct page		*b_page_array[XB_PAGES]; /* inline pages */
+	struct xfs_buf_map	*b_maps;	/* compound buffer map */
+	struct xfs_buf_map	__b_map;	/* inline compound buffer map */
+	int			b_map_count;
+	atomic_t		b_pin_count;	/* pin count */
+	atomic_t		b_io_remaining;	/* #outstanding I/O requests */
+	unsigned int		b_page_count;	/* size of page array */
+	unsigned int		b_offset;	/* page offset of b_addr,
+						   only for _XBF_KMEM buffers */
+	int			b_error;	/* error code on I/O */
+
+	/*
+	 * async write failure retry count. Initialised to zero on the first
+	 * failure, then when it exceeds the maximum configured without a
+	 * success the write is considered to be failed permanently and the
+	 * iodone handler will take appropriate action.
+	 *
+	 * For retry timeouts, we record the jiffie of the first failure. This
+	 * means that we can change the retry timeout for buffers already under
+	 * I/O and thus avoid getting stuck in a retry loop with a long timeout.
+	 *
+	 * last_error is used to ensure that we are getting repeated errors, not
+	 * different errors. e.g. a block device might change ENOSPC to EIO when
+	 * a failure timeout occurs, so we want to re-initialise the error
+	 * retry behaviour appropriately when that happens.
+	 */
+	int			b_retries;
+	unsigned long		b_first_retry_time; /* in jiffies */
+	int			b_last_error;
+
+	const struct xfs_buf_ops	*b_ops;
+	struct rcu_head		b_rcu;
+};
+
+/* Finding and Reading Buffers */
+int xfs_buf_get_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
+		int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp);
+int xfs_buf_read_map(struct xfs_buftarg *target, struct xfs_buf_map *map,
+		int nmaps, xfs_buf_flags_t flags, struct xfs_buf **bpp,
+		const struct xfs_buf_ops *ops, xfs_failaddr_t fa);
+void xfs_buf_readahead_map(struct xfs_buftarg *target,
+			       struct xfs_buf_map *map, int nmaps,
+			       const struct xfs_buf_ops *ops);
+
+static inline int
+xfs_buf_incore(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	xfs_buf_flags_t		flags,
+	struct xfs_buf		**bpp)
+{
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+
+	return xfs_buf_get_map(target, &map, 1, XBF_INCORE | flags, bpp);
+}
+
+static inline int
+xfs_buf_get(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	struct xfs_buf		**bpp)
+{
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+
+	return xfs_buf_get_map(target, &map, 1, 0, bpp);
+}
+
+static inline int
+xfs_buf_read(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	xfs_buf_flags_t		flags,
+	struct xfs_buf		**bpp,
+	const struct xfs_buf_ops *ops)
+{
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+
+	return xfs_buf_read_map(target, &map, 1, flags, bpp, ops,
+			__builtin_return_address(0));
+}
+
+static inline void
+xfs_buf_readahead(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	const struct xfs_buf_ops *ops)
+{
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+	return xfs_buf_readahead_map(target, &map, 1, ops);
+}
+
+int xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
+		xfs_buf_flags_t flags, struct xfs_buf **bpp);
+int xfs_buf_read_uncached(struct xfs_buftarg *target, xfs_daddr_t daddr,
+		size_t numblks, xfs_buf_flags_t flags, struct xfs_buf **bpp,
+		const struct xfs_buf_ops *ops);
+int _xfs_buf_read(struct xfs_buf *bp, xfs_buf_flags_t flags);
+void xfs_buf_hold(struct xfs_buf *bp);
+
+/* Releasing Buffers */
+extern void xfs_buf_rele(struct xfs_buf *);
+
+/* Locking and Unlocking Buffers */
+extern int xfs_buf_trylock(struct xfs_buf *);
+extern void xfs_buf_lock(struct xfs_buf *);
+extern void xfs_buf_unlock(struct xfs_buf *);
+#define xfs_buf_islocked(bp) \
+	((bp)->b_sema.count <= 0)
+
+static inline void xfs_buf_relse(struct xfs_buf *bp)
+{
+	xfs_buf_unlock(bp);
+	xfs_buf_rele(bp);
+}
+
+/* Buffer Read and Write Routines */
+extern int xfs_bwrite(struct xfs_buf *bp);
+
+extern void __xfs_buf_ioerror(struct xfs_buf *bp, int error,
+		xfs_failaddr_t failaddr);
+#define xfs_buf_ioerror(bp, err) __xfs_buf_ioerror((bp), (err), __this_address)
+extern void xfs_buf_ioerror_alert(struct xfs_buf *bp, xfs_failaddr_t fa);
+void xfs_buf_ioend_fail(struct xfs_buf *);
+void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize);
+void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa);
+#define xfs_buf_mark_corrupt(bp) __xfs_buf_mark_corrupt((bp), __this_address)
+
+/* Buffer Utility Routines */
+extern void *xfs_buf_offset(struct xfs_buf *, size_t);
+extern void xfs_buf_stale(struct xfs_buf *bp);
+
+/* Delayed Write Buffer Routines */
+extern void xfs_buf_delwri_cancel(struct list_head *);
+extern bool xfs_buf_delwri_queue(struct xfs_buf *, struct list_head *);
+extern int xfs_buf_delwri_submit(struct list_head *);
+extern int xfs_buf_delwri_submit_nowait(struct list_head *);
+extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *);
+
+static inline xfs_daddr_t xfs_buf_daddr(struct xfs_buf *bp)
+{
+	return bp->b_maps[0].bm_bn;
+}
+
+void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref);
+
+/*
+ * If the buffer is already on the LRU, do nothing. Otherwise set the buffer
+ * up with a reference count of 0 so it will be tossed from the cache when
+ * released.
+ */
+static inline void xfs_buf_oneshot(struct xfs_buf *bp)
+{
+	if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1)
+		return;
+	atomic_set(&bp->b_lru_ref, 0);
+}
+
+static inline int xfs_buf_ispinned(struct xfs_buf *bp)
+{
+	return atomic_read(&bp->b_pin_count);
+}
+
+static inline int
+xfs_buf_verify_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
+{
+	return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
+				cksum_offset);
+}
+
+static inline void
+xfs_buf_update_cksum(struct xfs_buf *bp, unsigned long cksum_offset)
+{
+	xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),
+			 cksum_offset);
+}
+
+/*
+ *	Handling of buftargs.
+ */
+struct xfs_buftarg *xfs_alloc_buftarg(struct xfs_mount *mp,
+		struct block_device *bdev);
+extern void xfs_free_buftarg(struct xfs_buftarg *);
+extern void xfs_buftarg_wait(struct xfs_buftarg *);
+extern void xfs_buftarg_drain(struct xfs_buftarg *);
+extern int xfs_setsize_buftarg(struct xfs_buftarg *, unsigned int);
+
+#define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
+#define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)
+
+int xfs_buf_reverify(struct xfs_buf *bp, const struct xfs_buf_ops *ops);
+bool xfs_verify_magic(struct xfs_buf *bp, __be32 dmagic);
+bool xfs_verify_magic16(struct xfs_buf *bp, __be16 dmagic);
+
+#endif	/* __XFS_BUF_H__ */