add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/xfs/xfs_itable.h
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@@ -5,83 +5,60 @@
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 #ifndef __XFS_ITABLE_H__
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 #define	__XFS_ITABLE_H__
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-/*
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- * xfs_bulkstat() is used to fill in xfs_bstat structures as well as dm_stat
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- * structures (by the dmi library). This is a pointer to a formatter function
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- * that will iget the inode and fill in the appropriate structure.
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- * see xfs_bulkstat_one() and xfs_dm_bulkstat_one() in dmapi_xfs.c
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- */
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-typedef int (*bulkstat_one_pf)(struct xfs_mount	*mp,
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-			       xfs_ino_t	ino,
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-			       void		__user *buffer,
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-			       int		ubsize,
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-			       int		*ubused,
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-			       int		*stat);
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+/* In-memory representation of a userspace request for batch inode data. */
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+struct xfs_ibulk {
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+	struct xfs_mount	*mp;
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+	void __user		*ubuffer; /* user output buffer */
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+	xfs_ino_t		startino; /* start with this inode */
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+	unsigned int		icount;   /* number of elements in ubuffer */
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+	unsigned int		ocount;   /* number of records returned */
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+	unsigned int		flags;    /* see XFS_IBULK_FLAG_* */
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+};
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+
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+/* Only iterate within the same AG as startino */
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+#define XFS_IBULK_SAME_AG	(XFS_IWALK_SAME_AG)
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 /*
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- * Values for stat return value.
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+ * Advance the user buffer pointer by one record of the given size.  If the
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+ * buffer is now full, return the appropriate error code.
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  */
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-#define BULKSTAT_RV_NOTHING	0
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-#define BULKSTAT_RV_DIDONE	1
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-#define BULKSTAT_RV_GIVEUP	2
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+static inline int
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+xfs_ibulk_advance(
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+	struct xfs_ibulk	*breq,
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+	size_t			bytes)
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+{
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+	char __user		*b = breq->ubuffer;
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+
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+	breq->ubuffer = b + bytes;
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+	breq->ocount++;
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+	return breq->ocount == breq->icount ? -ECANCELED : 0;
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+}
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 /*
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  * Return stat information in bulk (by-inode) for the filesystem.
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  */
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-int					/* error status */
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-xfs_bulkstat(
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-	xfs_mount_t	*mp,		/* mount point for filesystem */
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-	xfs_ino_t	*lastino,	/* last inode returned */
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-	int		*count,		/* size of buffer/count returned */
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-	bulkstat_one_pf formatter,	/* func that'd fill a single buf */
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-	size_t		statstruct_size,/* sizeof struct that we're filling */
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-	char		__user *ubuffer,/* buffer with inode stats */
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-	int		*done);		/* 1 if there are more stats to get */
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-typedef int (*bulkstat_one_fmt_pf)(  /* used size in bytes or negative error */
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-	void			__user *ubuffer, /* buffer to write to */
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-	int			ubsize,		 /* remaining user buffer sz */
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-	int			*ubused,	 /* bytes used by formatter */
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-	const xfs_bstat_t	*buffer);        /* buffer to read from */
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+/*
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+ * Return codes for the formatter function are 0 to continue iterating, and
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+ * non-zero to stop iterating.  Any non-zero value will be passed up to the
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+ * bulkstat/inumbers caller.  The special value -ECANCELED can be used to stop
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+ * iteration, as neither bulkstat nor inumbers will ever generate that error
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+ * code on their own.
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+ */
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-int
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-xfs_bulkstat_one_int(
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-	xfs_mount_t		*mp,
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-	xfs_ino_t		ino,
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-	void			__user *buffer,
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-	int			ubsize,
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-	bulkstat_one_fmt_pf	formatter,
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-	int			*ubused,
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-	int			*stat);
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+typedef int (*bulkstat_one_fmt_pf)(struct xfs_ibulk *breq,
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+		const struct xfs_bulkstat *bstat);
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-int
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-xfs_bulkstat_one(
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-	xfs_mount_t		*mp,
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-	xfs_ino_t		ino,
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-	void			__user *buffer,
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-	int			ubsize,
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-	int			*ubused,
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-	int			*stat);
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+int xfs_bulkstat_one(struct xfs_ibulk *breq, bulkstat_one_fmt_pf formatter);
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+int xfs_bulkstat(struct xfs_ibulk *breq, bulkstat_one_fmt_pf formatter);
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+void xfs_bulkstat_to_bstat(struct xfs_mount *mp, struct xfs_bstat *bs1,
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+		const struct xfs_bulkstat *bstat);
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-typedef int (*inumbers_fmt_pf)(
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-	void			__user *ubuffer, /* buffer to write to */
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-	const xfs_inogrp_t	*buffer,	/* buffer to read from */
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-	long			count,		/* # of elements to read */
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-	long			*written);	/* # of bytes written */
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+typedef int (*inumbers_fmt_pf)(struct xfs_ibulk *breq,
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+		const struct xfs_inumbers *igrp);
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-int
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-xfs_inumbers_fmt(
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-	void			__user *ubuffer, /* buffer to write to */
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-	const xfs_inogrp_t	*buffer,	/* buffer to read from */
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-	long			count,		/* # of elements to read */
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-	long			*written);	/* # of bytes written */
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-
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-int					/* error status */
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-xfs_inumbers(
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-	xfs_mount_t		*mp,	/* mount point for filesystem */
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-	xfs_ino_t		*last,	/* last inode returned */
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-	int			*count,	/* size of buffer/count returned */
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-	void			__user *buffer, /* buffer with inode info */
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-	inumbers_fmt_pf		formatter);
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+int xfs_inumbers(struct xfs_ibulk *breq, inumbers_fmt_pf formatter);
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+void xfs_inumbers_to_inogrp(struct xfs_inogrp *ig1,
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+		const struct xfs_inumbers *ig);
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 #endif	/* __XFS_ITABLE_H__ */