1 files changed, 150 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
new file mode 100644
index 000000000000..bdf52a333f3f
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_ATTR_H__
+#define	__XFS_ATTR_H__
+
+struct xfs_inode;
+struct xfs_da_args;
+struct xfs_attr_list_context;
+
+/*
+ * Large attribute lists are structured around Btrees where all the data
+ * elements are in the leaf nodes.  Attribute names are hashed into an int,
+ * then that int is used as the index into the Btree.  Since the hashval
+ * of an attribute name may not be unique, we may have duplicate keys.
+ * The internal links in the Btree are logical block offsets into the file.
+ *
+ * Small attribute lists use a different format and are packed as tightly
+ * as possible so as to fit into the literal area of the inode.
+ */
+
+/*========================================================================
+ * External interfaces
+ *========================================================================*/
+
+
+#define ATTR_DONTFOLLOW	0x0001	/* -- unused, from IRIX -- */
+#define ATTR_ROOT	0x0002	/* use attrs in root (trusted) namespace */
+#define ATTR_TRUST	0x0004	/* -- unused, from IRIX -- */
+#define ATTR_SECURE	0x0008	/* use attrs in security namespace */
+#define ATTR_CREATE	0x0010	/* pure create: fail if attr already exists */
+#define ATTR_REPLACE	0x0020	/* pure set: fail if attr does not exist */
+
+#define ATTR_KERNOTIME	0x1000	/* [kernel] don't update inode timestamps */
+#define ATTR_KERNOVAL	0x2000	/* [kernel] get attr size only, not value */
+
+#define ATTR_INCOMPLETE	0x4000	/* [kernel] return INCOMPLETE attr keys */
+
+#define XFS_ATTR_FLAGS \
+	{ ATTR_DONTFOLLOW, 	"DONTFOLLOW" }, \
+	{ ATTR_ROOT,		"ROOT" }, \
+	{ ATTR_TRUST,		"TRUST" }, \
+	{ ATTR_SECURE,		"SECURE" }, \
+	{ ATTR_CREATE,		"CREATE" }, \
+	{ ATTR_REPLACE,		"REPLACE" }, \
+	{ ATTR_KERNOTIME,	"KERNOTIME" }, \
+	{ ATTR_KERNOVAL,	"KERNOVAL" }, \
+	{ ATTR_INCOMPLETE,	"INCOMPLETE" }
+
+/*
+ * The maximum size (into the kernel or returned from the kernel) of an
+ * attribute value or the buffer used for an attr_list() call.  Larger
+ * sizes will result in an ERANGE return code.
+ */
+#define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */
+
+/*
+ * Define how lists of attribute names are returned to the user from
+ * the attr_list() call.  A large, 32bit aligned, buffer is passed in
+ * along with its size.  We put an array of offsets at the top that each
+ * reference an attrlist_ent_t and pack the attrlist_ent_t's at the bottom.
+ */
+typedef struct attrlist {
+	__s32	al_count;	/* number of entries in attrlist */
+	__s32	al_more;	/* T/F: more attrs (do call again) */
+	__s32	al_offset[1];	/* byte offsets of attrs [var-sized] */
+} attrlist_t;
+
+/*
+ * Show the interesting info about one attribute.  This is what the
+ * al_offset[i] entry points to.
+ */
+typedef struct attrlist_ent {	/* data from attr_list() */
+	__u32	a_valuelen;	/* number bytes in value of attr */
+	char	a_name[1];	/* attr name (NULL terminated) */
+} attrlist_ent_t;
+
+/*
+ * Given a pointer to the (char*) buffer containing the attr_list() result,
+ * and an index, return a pointer to the indicated attribute in the buffer.
+ */
+#define	ATTR_ENTRY(buffer, index)		\
+	((attrlist_ent_t *)			\
+	 &((char *)buffer)[ ((attrlist_t *)(buffer))->al_offset[index] ])
+
+/*
+ * Kernel-internal version of the attrlist cursor.
+ */
+typedef struct attrlist_cursor_kern {
+	__u32	hashval;	/* hash value of next entry to add */
+	__u32	blkno;		/* block containing entry (suggestion) */
+	__u32	offset;		/* offset in list of equal-hashvals */
+	__u16	pad1;		/* padding to match user-level */
+	__u8	pad2;		/* padding to match user-level */
+	__u8	initted;	/* T/F: cursor has been initialized */
+} attrlist_cursor_kern_t;
+
+
+/*========================================================================
+ * Structure used to pass context around among the routines.
+ *========================================================================*/
+
+
+/* void; state communicated via *context */
+typedef void (*put_listent_func_t)(struct xfs_attr_list_context *, int,
+			      unsigned char *, int, int);
+
+typedef struct xfs_attr_list_context {
+	struct xfs_trans		*tp;
+	struct xfs_inode		*dp;		/* inode */
+	struct attrlist_cursor_kern	*cursor;	/* position in list */
+	char				*alist;		/* output buffer */
+	int				seen_enough;	/* T/F: seen enough of list? */
+	ssize_t				count;		/* num used entries */
+	int				dupcnt;		/* count dup hashvals seen */
+	int				bufsize;	/* total buffer size */
+	int				firstu;		/* first used byte in buffer */
+	int				flags;		/* from VOP call */
+	int				resynch;	/* T/F: resynch with cursor */
+	put_listent_func_t		put_listent;	/* list output fmt function */
+	int				index;		/* index into output buffer */
+} xfs_attr_list_context_t;
+
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Overall external interface routines.
+ */
+int xfs_attr_inactive(struct xfs_inode *dp);
+int xfs_attr_list_int_ilocked(struct xfs_attr_list_context *);
+int xfs_attr_list_int(struct xfs_attr_list_context *);
+int xfs_inode_hasattr(struct xfs_inode *ip);
+int xfs_attr_get_ilocked(struct xfs_inode *ip, struct xfs_da_args *args);
+int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
+		 unsigned char *value, int *valuelenp, int flags);
+int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
+		 unsigned char *value, int valuelen, int flags);
+int xfs_attr_set_args(struct xfs_da_args *args, struct xfs_buf **leaf_bp);
+int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
+int xfs_attr_remove_args(struct xfs_da_args *args);
+int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
+		  int flags, struct attrlist_cursor_kern *cursor);
+
+
+#endif	/* __XFS_ATTR_H__ */