1. 根目录:
2. fs
3. xfs
4. xfs_attr_leaf.h

/*
 * Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
 * Copyright (c) 2013 Red Hat, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_ATTR_LEAF_H__
#define	__XFS_ATTR_LEAF_H__

struct attrlist;
struct attrlist_cursor_kern;
struct xfs_attr_list_context;
struct xfs_da_args;
struct xfs_da_state;
struct xfs_da_state_blk;
struct xfs_inode;
struct xfs_trans;

/*
 * Used to keep a list of "remote value" extents when unlinking an inode.
 */
typedef struct xfs_attr_inactive_list {
	xfs_dablk_t	valueblk;	/* block number of value bytes */
	int		valuelen;	/* number of bytes in value */
} xfs_attr_inactive_list_t;


/*========================================================================
 * Function prototypes for the kernel.
 *========================================================================*/

/*
 * Internal routines when attribute fork size < XFS_LITINO(mp).
 */
void	xfs_attr_shortform_create(struct xfs_da_args *args);
void	xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
int	xfs_attr_shortform_lookup(struct xfs_da_args *args);
int	xfs_attr_shortform_getvalue(struct xfs_da_args *args);
int	xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
int	xfs_attr_shortform_remove(struct xfs_da_args *args);
int	xfs_attr_shortform_list(struct xfs_attr_list_context *context);
int	xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
int	xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes);


/*
 * Internal routines when attribute fork size == XFS_LBSIZE(mp).
 */
int	xfs_attr3_leaf_to_node(struct xfs_da_args *args);
int	xfs_attr3_leaf_to_shortform(struct xfs_buf *bp,
				   struct xfs_da_args *args, int forkoff);
int	xfs_attr3_leaf_clearflag(struct xfs_da_args *args);
int	xfs_attr3_leaf_setflag(struct xfs_da_args *args);
int	xfs_attr3_leaf_flipflags(struct xfs_da_args *args);

/*
 * Routines used for growing the Btree.
 */
int	xfs_attr3_leaf_split(struct xfs_da_state *state,
				   struct xfs_da_state_blk *oldblk,
				   struct xfs_da_state_blk *newblk);
int	xfs_attr3_leaf_lookup_int(struct xfs_buf *leaf,
					struct xfs_da_args *args);
int	xfs_attr3_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
int	xfs_attr3_leaf_add(struct xfs_buf *leaf_buffer,
				 struct xfs_da_args *args);
int	xfs_attr3_leaf_remove(struct xfs_buf *leaf_buffer,
				    struct xfs_da_args *args);
int	xfs_attr3_leaf_list_int(struct xfs_buf *bp,
				      struct xfs_attr_list_context *context);

/*
 * Routines used for shrinking the Btree.
 */
int	xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
void	xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
				       struct xfs_da_state_blk *drop_blk,
				       struct xfs_da_state_blk *save_blk);
int	xfs_attr3_root_inactive(struct xfs_trans **trans, struct xfs_inode *dp);

/*
 * Utility routines.
 */
xfs_dahash_t	xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
int	xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
				   struct xfs_buf *leaf2_bp);
int	xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize,
					int *local);
int	xfs_attr3_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
			xfs_dablk_t bno, xfs_daddr_t mappedbno,
			struct xfs_buf **bpp);
void	xfs_attr3_leaf_hdr_from_disk(struct xfs_attr3_icleaf_hdr *to,
				     struct xfs_attr_leafblock *from);
void	xfs_attr3_leaf_hdr_to_disk(struct xfs_attr_leafblock *to,
				   struct xfs_attr3_icleaf_hdr *from);

#endif	/* __XFS_ATTR_LEAF_H__ */