[deliverable/linux.git] / fs / xfs / xfs_da_btree.h

/*
 * Copyright (c) 2000,2002,2005 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_DA_BTREE_H__
#define	__XFS_DA_BTREE_H__

struct xfs_bmap_free;
struct xfs_inode;
struct xfs_trans;
struct zone;

/*========================================================================
 * Directory Structure when greater than XFS_LBSIZE(mp) bytes.
 *========================================================================*/

/*
 * This structure is common to both leaf nodes and non-leaf nodes in the Btree.
 *
 * It is used to manage a doubly linked list of all blocks at the same
 * level in the Btree, and to identify which type of block this is.
 */
#define XFS_DA_NODE_MAGIC	0xfebe	/* magic number: non-leaf blocks */
#define XFS_ATTR_LEAF_MAGIC	0xfbee	/* magic number: attribute leaf blks */
#define	XFS_DIR2_LEAF1_MAGIC	0xd2f1	/* magic number: v2 dirlf single blks */
#define	XFS_DIR2_LEAFN_MAGIC	0xd2ff	/* magic number: v2 dirlf multi blks */

typedef struct xfs_da_blkinfo {
	__be32		forw;			/* previous block in list */
	__be32		back;			/* following block in list */
	__be16		magic;			/* validity check on block */
	__be16		pad;			/* unused */
} xfs_da_blkinfo_t;

/*
 * CRC enabled directory structure types
 *
 * The headers change size for the additional verification information, but
 * otherwise the tree layouts and contents are unchanged. Hence the da btree
 * code can use the struct xfs_da_blkinfo for manipulating the tree links and
 * magic numbers without modification for both v2 and v3 nodes.
 */
#define XFS_DA3_NODE_MAGIC	0x3ebe	/* magic number: non-leaf blocks */
#define XFS_ATTR3_LEAF_MAGIC	0x3bee	/* magic number: attribute leaf blks */
#define	XFS_DIR3_LEAF1_MAGIC	0x3df1	/* magic number: v2 dirlf single blks */
#define	XFS_DIR3_LEAFN_MAGIC	0x3dff	/* magic number: v2 dirlf multi blks */

struct xfs_da3_blkinfo {
	/*
	 * the node link manipulation code relies on the fact that the first
	 * element of this structure is the struct xfs_da_blkinfo so it can
	 * ignore the differences in the rest of the structures.
	 */
	struct xfs_da_blkinfo	hdr;
	__be32			crc;	/* CRC of block */
	__be64			blkno;	/* first block of the buffer */
	__be64			lsn;	/* sequence number of last write */
	uuid_t			uuid;	/* filesystem we belong to */
	__be64			owner;	/* inode that owns the block */
};

/*
 * This is the structure of the root and intermediate nodes in the Btree.
 * The leaf nodes are defined above.
 *
 * Entries are not packed.
 *
 * Since we have duplicate keys, use a binary search but always follow
 * all match in the block, not just the first match found.
 */
#define	XFS_DA_NODE_MAXDEPTH	5	/* max depth of Btree */

typedef struct xfs_da_node_hdr {
	struct xfs_da_blkinfo	info;	/* block type, links, etc. */
	__be16			__count; /* count of active entries */
	__be16			__level; /* level above leaves (leaf == 0) */
} xfs_da_node_hdr_t;

struct xfs_da3_node_hdr {
	struct xfs_da3_blkinfo	info;	/* block type, links, etc. */
	__be16			__count; /* count of active entries */
	__be16			__level; /* level above leaves (leaf == 0) */
	__be32			__pad32;
};

#define XFS_DA3_NODE_CRC_OFF	(offsetof(struct xfs_da3_node_hdr, info.crc))

typedef struct xfs_da_node_entry {
	__be32	hashval;	/* hash value for this descendant */
	__be32	before;		/* Btree block before this key */
} xfs_da_node_entry_t;

typedef struct xfs_da_intnode {
	struct xfs_da_node_hdr	hdr;
	struct xfs_da_node_entry __btree[];
} xfs_da_intnode_t;

struct xfs_da3_intnode {
	struct xfs_da3_node_hdr	hdr;
	struct xfs_da_node_entry __btree[];
};

/*
 * In-core version of the node header to abstract the differences in the v2 and
 * v3 disk format of the headers. Callers need to convert to/from disk format as
 * appropriate.
 */
struct xfs_da3_icnode_hdr {
	__uint32_t	forw;
	__uint32_t	back;
	__uint16_t	magic;
	__uint16_t	count;
	__uint16_t	level;
};

extern void xfs_da3_node_hdr_from_disk(struct xfs_da3_icnode_hdr *to,
				       struct xfs_da_intnode *from);
extern void xfs_da3_node_hdr_to_disk(struct xfs_da_intnode *to,
				     struct xfs_da3_icnode_hdr *from);

static inline int
__xfs_da3_node_hdr_size(bool v3)
{
	if (v3)
		return sizeof(struct xfs_da3_node_hdr);
	return sizeof(struct xfs_da_node_hdr);
}
static inline int
xfs_da3_node_hdr_size(struct xfs_da_intnode *dap)
{
	bool	v3 = dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC);

	return __xfs_da3_node_hdr_size(v3);
}

static inline struct xfs_da_node_entry *
xfs_da3_node_tree_p(struct xfs_da_intnode *dap)
{
	if (dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) {
		struct xfs_da3_intnode *dap3 = (struct xfs_da3_intnode *)dap;
		return dap3->__btree;
	}
	return dap->__btree;
}

extern void xfs_da3_intnode_from_disk(struct xfs_da3_icnode_hdr *to,
				      struct xfs_da_intnode *from);
extern void xfs_da3_intnode_to_disk(struct xfs_da_intnode *to,
				    struct xfs_da3_icnode_hdr *from);

#define	XFS_LBSIZE(mp)	(mp)->m_sb.sb_blocksize

/*========================================================================
 * Btree searching and modification structure definitions.
 *========================================================================*/

/*
 * Search comparison results
 */
enum xfs_dacmp {
	XFS_CMP_DIFFERENT,	/* names are completely different */
	XFS_CMP_EXACT,		/* names are exactly the same */
	XFS_CMP_CASE		/* names are same but differ in case */
};

/*
 * Structure to ease passing around component names.
 */
typedef struct xfs_da_args {
	const __uint8_t	*name;		/* string (maybe not NULL terminated) */
	int		namelen;	/* length of string (maybe no NULL) */
	__uint8_t	filetype;	/* filetype of inode for directories */
	__uint8_t	*value;		/* set of bytes (maybe contain NULLs) */
	int		valuelen;	/* length of value */
	int		flags;		/* argument flags (eg: ATTR_NOCREATE) */
	xfs_dahash_t	hashval;	/* hash value of name */
	xfs_ino_t	inumber;	/* input/output inode number */
	struct xfs_inode *dp;		/* directory inode to manipulate */
	xfs_fsblock_t	*firstblock;	/* ptr to firstblock for bmap calls */
	struct xfs_bmap_free *flist;	/* ptr to freelist for bmap_finish */
	struct xfs_trans *trans;	/* current trans (changes over time) */
	xfs_extlen_t	total;		/* total blocks needed, for 1st bmap */
	int		whichfork;	/* data or attribute fork */
	xfs_dablk_t	blkno;		/* blkno of attr leaf of interest */
	int		index;		/* index of attr of interest in blk */
	xfs_dablk_t	rmtblkno;	/* remote attr value starting blkno */
	int		rmtblkcnt;	/* remote attr value block count */
	xfs_dablk_t	blkno2;		/* blkno of 2nd attr leaf of interest */
	int		index2;		/* index of 2nd attr in blk */
	xfs_dablk_t	rmtblkno2;	/* remote attr value starting blkno */
	int		rmtblkcnt2;	/* remote attr value block count */
	int		op_flags;	/* operation flags */
	enum xfs_dacmp	cmpresult;	/* name compare result for lookups */
} xfs_da_args_t;

/*
 * Operation flags:
 */
#define XFS_DA_OP_JUSTCHECK	0x0001	/* check for ok with no space */
#define XFS_DA_OP_RENAME	0x0002	/* this is an atomic rename op */
#define XFS_DA_OP_ADDNAME	0x0004	/* this is an add operation */
#define XFS_DA_OP_OKNOENT	0x0008	/* lookup/add op, ENOENT ok, else die */
#define XFS_DA_OP_CILOOKUP	0x0010	/* lookup to return CI name if found */

#define XFS_DA_OP_FLAGS \
	{ XFS_DA_OP_JUSTCHECK,	"JUSTCHECK" }, \
	{ XFS_DA_OP_RENAME,	"RENAME" }, \
	{ XFS_DA_OP_ADDNAME,	"ADDNAME" }, \
	{ XFS_DA_OP_OKNOENT,	"OKNOENT" }, \
	{ XFS_DA_OP_CILOOKUP,	"CILOOKUP" }

/*
 * Storage for holding state during Btree searches and split/join ops.
 *
 * Only need space for 5 intermediate nodes.  With a minimum of 62-way
 * fanout to the Btree, we can support over 900 million directory blocks,
 * which is slightly more than enough.
 */
typedef struct xfs_da_state_blk {
	struct xfs_buf	*bp;		/* buffer containing block */
	xfs_dablk_t	blkno;		/* filesystem blkno of buffer */
	xfs_daddr_t	disk_blkno;	/* on-disk blkno (in BBs) of buffer */
	int		index;		/* relevant index into block */
	xfs_dahash_t	hashval;	/* last hash value in block */
	int		magic;		/* blk's magic number, ie: blk type */
} xfs_da_state_blk_t;

typedef struct xfs_da_state_path {
	int			active;		/* number of active levels */
	xfs_da_state_blk_t	blk[XFS_DA_NODE_MAXDEPTH];
} xfs_da_state_path_t;

typedef struct xfs_da_state {
	xfs_da_args_t		*args;		/* filename arguments */
	struct xfs_mount	*mp;		/* filesystem mount point */
	unsigned int		blocksize;	/* logical block size */
	unsigned int		node_ents;	/* how many entries in danode */
	xfs_da_state_path_t	path;		/* search/split paths */
	xfs_da_state_path_t	altpath;	/* alternate path for join */
	unsigned char		inleaf;		/* insert into 1->lf, 0->splf */
	unsigned char		extravalid;	/* T/F: extrablk is in use */
	unsigned char		extraafter;	/* T/F: extrablk is after new */
	xfs_da_state_blk_t	extrablk;	/* for double-splits on leaves */
						/* for dirv2 extrablk is data */
} xfs_da_state_t;

/*
 * Utility macros to aid in logging changed structure fields.
 */
#define XFS_DA_LOGOFF(BASE, ADDR)	((char *)(ADDR) - (char *)(BASE))
#define XFS_DA_LOGRANGE(BASE, ADDR, SIZE)	\
		(uint)(XFS_DA_LOGOFF(BASE, ADDR)), \
		(uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1)

/*
 * Name ops for directory and/or attr name operations
 */
struct xfs_nameops {
	xfs_dahash_t	(*hashname)(struct xfs_name *);
	enum xfs_dacmp	(*compname)(struct xfs_da_args *,
					const unsigned char *, int);
};


/*========================================================================
 * Function prototypes.
 *========================================================================*/

/*
 * Routines used for growing the Btree.
 */
int	xfs_da3_node_create(struct xfs_da_args *args, xfs_dablk_t blkno,
			    int level, struct xfs_buf **bpp, int whichfork);
int	xfs_da3_split(xfs_da_state_t *state);

/*
 * Routines used for shrinking the Btree.
 */
int	xfs_da3_join(xfs_da_state_t *state);
void	xfs_da3_fixhashpath(struct xfs_da_state *state,
			    struct xfs_da_state_path *path_to_to_fix);

/*
 * Routines used for finding things in the Btree.
 */
int	xfs_da3_node_lookup_int(xfs_da_state_t *state, int *result);
int	xfs_da3_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
					 int forward, int release, int *result);
/*
 * Utility routines.
 */
int	xfs_da3_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk,
				       xfs_da_state_blk_t *new_blk);
int	xfs_da3_node_read(struct xfs_trans *tp, struct xfs_inode *dp,
			 xfs_dablk_t bno, xfs_daddr_t mappedbno,
			 struct xfs_buf **bpp, int which_fork);

/*
 * Utility routines.
 */
int	xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno);
int	xfs_da_grow_inode_int(struct xfs_da_args *args, xfs_fileoff_t *bno,
			      int count);
int	xfs_da_get_buf(struct xfs_trans *trans, struct xfs_inode *dp,
			      xfs_dablk_t bno, xfs_daddr_t mappedbno,
			      struct xfs_buf **bp, int whichfork);
int	xfs_da_read_buf(struct xfs_trans *trans, struct xfs_inode *dp,
			       xfs_dablk_t bno, xfs_daddr_t mappedbno,
			       struct xfs_buf **bpp, int whichfork,
			       const struct xfs_buf_ops *ops);
xfs_daddr_t	xfs_da_reada_buf(struct xfs_trans *trans, struct xfs_inode *dp,
				xfs_dablk_t bno, xfs_daddr_t mapped_bno,
				int whichfork, const struct xfs_buf_ops *ops);
int	xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
					  struct xfs_buf *dead_buf);

uint xfs_da_hashname(const __uint8_t *name_string, int name_length);
enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
				const unsigned char *name, int len);


xfs_da_state_t *xfs_da_state_alloc(void);
void xfs_da_state_free(xfs_da_state_t *state);

extern struct kmem_zone *xfs_da_state_zone;
extern const struct xfs_nameops xfs_default_nameops;

#endif	/* __XFS_DA_BTREE_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769	2	* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
f5ea1100	3	* Copyright (c) 2013 Red Hat, Inc.
7b718769	4	* All Rights Reserved.
1da177e4	5	*
7b718769 NS	6	* This program is free software; you can redistribute it and/or
7b718769 NS	7	* modify it under the terms of the GNU General Public License as
1da177e4 LT	8	* published by the Free Software Foundation.
1da177e4 LT	9	*
7b718769 NS	10	* This program is distributed in the hope that it would be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
1da177e4	14	*
7b718769 NS	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write the Free Software Foundation,
	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	18	*/
	19	#ifndef __XFS_DA_BTREE_H__
	20	#define __XFS_DA_BTREE_H__
	21
1da177e4 LT	22	struct xfs_bmap_free;
1da177e4 LT	23	struct xfs_inode;
1da177e4 LT	24	struct xfs_trans;
	25	struct zone;
	26
	27	/*========================================================================
	28	* Directory Structure when greater than XFS_LBSIZE(mp) bytes.
	29	========================================================================/
	30
	31	/*
	32	* This structure is common to both leaf nodes and non-leaf nodes in the Btree.
	33	*
96ee34be	34	* It is used to manage a doubly linked list of all blocks at the same
1da177e4 LT	35	* level in the Btree, and to identify which type of block this is.
	36	*/
	37	#define XFS_DA_NODE_MAGIC 0xfebe /* magic number: non-leaf blocks */
1da177e4 LT	38	#define XFS_ATTR_LEAF_MAGIC 0xfbee /* magic number: attribute leaf blks */
	39	#define XFS_DIR2_LEAF1_MAGIC 0xd2f1 /* magic number: v2 dirlf single blks */
	40	#define XFS_DIR2_LEAFN_MAGIC 0xd2ff /* magic number: v2 dirlf multi blks */
	41
1da177e4	42	typedef struct xfs_da_blkinfo {
89da0544 NS	43	__be32 forw; /* previous block in list */
	44	__be32 back; /* following block in list */
	45	__be16 magic; /* validity check on block */
	46	__be16 pad; /* unused */
1da177e4 LT	47	} xfs_da_blkinfo_t;
1da177e4 LT	48
24df33b4 DC	49	/*
	50	* CRC enabled directory structure types
	51	*
	52	* The headers change size for the additional verification information, but
f5ea1100 DC	53	* otherwise the tree layouts and contents are unchanged. Hence the da btree
	54	* code can use the struct xfs_da_blkinfo for manipulating the tree links and
	55	* magic numbers without modification for both v2 and v3 nodes.
24df33b4	56	*/
f5ea1100	57	#define XFS_DA3_NODE_MAGIC 0x3ebe /* magic number: non-leaf blocks */
517c2220	58	#define XFS_ATTR3_LEAF_MAGIC 0x3bee /* magic number: attribute leaf blks */
24df33b4 DC	59	#define XFS_DIR3_LEAF1_MAGIC 0x3df1 /* magic number: v2 dirlf single blks */
	60	#define XFS_DIR3_LEAFN_MAGIC 0x3dff /* magic number: v2 dirlf multi blks */
	61
	62	struct xfs_da3_blkinfo {
	63	/*
	64	* the node link manipulation code relies on the fact that the first
	65	* element of this structure is the struct xfs_da_blkinfo so it can
	66	* ignore the differences in the rest of the structures.
	67	*/
	68	struct xfs_da_blkinfo hdr;
	69	__be32 crc; /* CRC of block */
	70	__be64 blkno; /* first block of the buffer */
	71	__be64 lsn; /* sequence number of last write */
	72	uuid_t uuid; /* filesystem we belong to */
	73	__be64 owner; /* inode that owns the block */
	74	};
	75
1da177e4 LT	76	/*
	77	* This is the structure of the root and intermediate nodes in the Btree.
	78	* The leaf nodes are defined above.
	79	*
	80	* Entries are not packed.
	81	*
	82	* Since we have duplicate keys, use a binary search but always follow
	83	* all match in the block, not just the first match found.
	84	*/
	85	#define XFS_DA_NODE_MAXDEPTH 5 /* max depth of Btree */
	86
f5ea1100 DC	87	typedef struct xfs_da_node_hdr {
f5ea1100 DC	88	struct xfs_da_blkinfo info; /* block type, links, etc. */
517c2220	89	__be16 __count; /* count of active entries */
f5ea1100 DC	90	__be16 __level; /* level above leaves (leaf == 0) */
	91	} xfs_da_node_hdr_t;
	92
	93	struct xfs_da3_node_hdr {
	94	struct xfs_da3_blkinfo info; /* block type, links, etc. */
517c2220	95	__be16 __count; /* count of active entries */
f5ea1100 DC	96	__be16 __level; /* level above leaves (leaf == 0) */
	97	__be32 __pad32;
	98	};
	99
	100	#define XFS_DA3_NODE_CRC_OFF (offsetof(struct xfs_da3_node_hdr, info.crc))
	101
	102	typedef struct xfs_da_node_entry {
	103	__be32 hashval; /* hash value for this descendant */
	104	__be32 before; /* Btree block before this key */
	105	} xfs_da_node_entry_t;
	106
1da177e4	107	typedef struct xfs_da_intnode {
f5ea1100 DC	108	struct xfs_da_node_hdr hdr;
f5ea1100 DC	109	struct xfs_da_node_entry __btree[];
1da177e4	110	} xfs_da_intnode_t;
f5ea1100 DC	111
	112	struct xfs_da3_intnode {
	113	struct xfs_da3_node_hdr hdr;
	114	struct xfs_da_node_entry __btree[];
	115	};
	116
	117	/*
	118	* In-core version of the node header to abstract the differences in the v2 and
	119	* v3 disk format of the headers. Callers need to convert to/from disk format as
	120	* appropriate.
	121	*/
	122	struct xfs_da3_icnode_hdr {
	123	__uint32_t forw;
	124	__uint32_t back;
	125	__uint16_t magic;
	126	__uint16_t count;
	127	__uint16_t level;
	128	};
	129
	130	extern void xfs_da3_node_hdr_from_disk(struct xfs_da3_icnode_hdr *to,
	131	struct xfs_da_intnode *from);
	132	extern void xfs_da3_node_hdr_to_disk(struct xfs_da_intnode *to,
	133	struct xfs_da3_icnode_hdr *from);
	134
	135	static inline int
37804376	136	__xfs_da3_node_hdr_size(bool v3)
f5ea1100	137	{
37804376	138	if (v3)
f5ea1100 DC	139	return sizeof(struct xfs_da3_node_hdr);
	140	return sizeof(struct xfs_da_node_hdr);
	141	}
37804376 DC	142	static inline int
	143	xfs_da3_node_hdr_size(struct xfs_da_intnode *dap)
	144	{
	145	bool v3 = dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC);
	146
	147	return __xfs_da3_node_hdr_size(v3);
	148	}
f5ea1100 DC	149
	150	static inline struct xfs_da_node_entry *
	151	xfs_da3_node_tree_p(struct xfs_da_intnode *dap)
	152	{
	153	if (dap->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) {
	154	struct xfs_da3_intnode dap3 = (struct xfs_da3_intnode )dap;
	155	return dap3->__btree;
	156	}
	157	return dap->__btree;
	158	}
	159
	160	extern void xfs_da3_intnode_from_disk(struct xfs_da3_icnode_hdr *to,
	161	struct xfs_da_intnode *from);
	162	extern void xfs_da3_intnode_to_disk(struct xfs_da_intnode *to,
	163	struct xfs_da3_icnode_hdr *from);
1da177e4	164
a844f451	165	#define XFS_LBSIZE(mp) (mp)->m_sb.sb_blocksize
1da177e4 LT	166
	167	/*========================================================================
	168	* Btree searching and modification structure definitions.
	169	========================================================================/
	170
5163f95a BN	171	/*
	172	* Search comparison results
	173	*/
	174	enum xfs_dacmp {
	175	XFS_CMP_DIFFERENT, /* names are completely different */
	176	XFS_CMP_EXACT, /* names are exactly the same */
	177	XFS_CMP_CASE /* names are same but differ in case */
	178	};
	179
1da177e4 LT	180	/*
	181	* Structure to ease passing around component names.
	182	*/
	183	typedef struct xfs_da_args {
a5687787	184	const __uint8_t name; / string (maybe not NULL terminated) */
1da177e4	185	int namelen; /* length of string (maybe no NULL) */
0cb97766	186	__uint8_t filetype; /* filetype of inode for directories */
a5687787	187	__uint8_t value; / set of bytes (maybe contain NULLs) */
1da177e4 LT	188	int valuelen; /* length of value */
	189	int flags; /* argument flags (eg: ATTR_NOCREATE) */
	190	xfs_dahash_t hashval; /* hash value of name */
	191	xfs_ino_t inumber; /* input/output inode number */
	192	struct xfs_inode dp; / directory inode to manipulate */
	193	xfs_fsblock_t firstblock; / ptr to firstblock for bmap calls */
	194	struct xfs_bmap_free flist; / ptr to freelist for bmap_finish */
	195	struct xfs_trans trans; / current trans (changes over time) */
	196	xfs_extlen_t total; /* total blocks needed, for 1st bmap */
	197	int whichfork; /* data or attribute fork */
	198	xfs_dablk_t blkno; /* blkno of attr leaf of interest */
	199	int index; /* index of attr of interest in blk */
	200	xfs_dablk_t rmtblkno; /* remote attr value starting blkno */
	201	int rmtblkcnt; /* remote attr value block count */
	202	xfs_dablk_t blkno2; /* blkno of 2nd attr leaf of interest */
	203	int index2; /* index of 2nd attr in blk */
	204	xfs_dablk_t rmtblkno2; /* remote attr value starting blkno */
	205	int rmtblkcnt2; /* remote attr value block count */
6a178100	206	int op_flags; /* operation flags */
5163f95a	207	enum xfs_dacmp cmpresult; /* name compare result for lookups */
1da177e4 LT	208	} xfs_da_args_t;
1da177e4 LT	209
6a178100 BN	210	/*
	211	* Operation flags:
	212	*/
	213	#define XFS_DA_OP_JUSTCHECK 0x0001 /* check for ok with no space */
	214	#define XFS_DA_OP_RENAME 0x0002 /* this is an atomic rename op */
	215	#define XFS_DA_OP_ADDNAME 0x0004 /* this is an add operation */
	216	#define XFS_DA_OP_OKNOENT 0x0008 /* lookup/add op, ENOENT ok, else die */
384f3ced	217	#define XFS_DA_OP_CILOOKUP 0x0010 /* lookup to return CI name if found */
6a178100	218
0b1b213f CH	219	#define XFS_DA_OP_FLAGS \
	220	{ XFS_DA_OP_JUSTCHECK, "JUSTCHECK" }, \
	221	{ XFS_DA_OP_RENAME, "RENAME" }, \
	222	{ XFS_DA_OP_ADDNAME, "ADDNAME" }, \
	223	{ XFS_DA_OP_OKNOENT, "OKNOENT" }, \
	224	{ XFS_DA_OP_CILOOKUP, "CILOOKUP" }
	225
1da177e4 LT	226	/*
	227	* Storage for holding state during Btree searches and split/join ops.
	228	*
	229	* Only need space for 5 intermediate nodes. With a minimum of 62-way
	230	* fanout to the Btree, we can support over 900 million directory blocks,
	231	* which is slightly more than enough.
	232	*/
	233	typedef struct xfs_da_state_blk {
1d9025e5	234	struct xfs_buf bp; / buffer containing block */
1da177e4 LT	235	xfs_dablk_t blkno; /* filesystem blkno of buffer */
	236	xfs_daddr_t disk_blkno; /* on-disk blkno (in BBs) of buffer */
	237	int index; /* relevant index into block */
	238	xfs_dahash_t hashval; /* last hash value in block */
	239	int magic; /* blk's magic number, ie: blk type */
	240	} xfs_da_state_blk_t;
	241
	242	typedef struct xfs_da_state_path {
	243	int active; /* number of active levels */
	244	xfs_da_state_blk_t blk[XFS_DA_NODE_MAXDEPTH];
	245	} xfs_da_state_path_t;
	246
	247	typedef struct xfs_da_state {
	248	xfs_da_args_t args; / filename arguments */
	249	struct xfs_mount mp; / filesystem mount point */
	250	unsigned int blocksize; /* logical block size */
	251	unsigned int node_ents; /* how many entries in danode */
	252	xfs_da_state_path_t path; /* search/split paths */
	253	xfs_da_state_path_t altpath; /* alternate path for join */
	254	unsigned char inleaf; /* insert into 1->lf, 0->splf */
	255	unsigned char extravalid; /* T/F: extrablk is in use */
	256	unsigned char extraafter; /* T/F: extrablk is after new */
9da096fd	257	xfs_da_state_blk_t extrablk; /* for double-splits on leaves */
1da177e4 LT	258	/* for dirv2 extrablk is data */
	259	} xfs_da_state_t;
	260
	261	/*
	262	* Utility macros to aid in logging changed structure fields.
	263	*/
	264	#define XFS_DA_LOGOFF(BASE, ADDR) ((char )(ADDR) - (char )(BASE))
	265	#define XFS_DA_LOGRANGE(BASE, ADDR, SIZE) \
	266	(uint)(XFS_DA_LOGOFF(BASE, ADDR)), \
	267	(uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1)
	268
5163f95a BN	269	/*
	270	* Name ops for directory and/or attr name operations
	271	*/
	272	struct xfs_nameops {
	273	xfs_dahash_t (hashname)(struct xfs_name );
2bc75421 DC	274	enum xfs_dacmp (compname)(struct xfs_da_args ,
2bc75421 DC	275	const unsigned char *, int);
5163f95a BN	276	};
5163f95a BN	277
1da177e4	278
1da177e4	279	/*========================================================================
847fff5c	280	* Function prototypes.
1da177e4 LT	281	========================================================================/
	282
	283	/*
	284	* Routines used for growing the Btree.
	285	*/
f5ea1100 DC	286	int xfs_da3_node_create(struct xfs_da_args *args, xfs_dablk_t blkno,
	287	int level, struct xfs_buf **bpp, int whichfork);
	288	int xfs_da3_split(xfs_da_state_t *state);
1da177e4 LT	289
	290	/*
	291	* Routines used for shrinking the Btree.
	292	*/
f5ea1100 DC	293	int xfs_da3_join(xfs_da_state_t *state);
	294	void xfs_da3_fixhashpath(struct xfs_da_state *state,
	295	struct xfs_da_state_path *path_to_to_fix);
1da177e4 LT	296
	297	/*
	298	* Routines used for finding things in the Btree.
	299	*/
f5ea1100 DC	300	int xfs_da3_node_lookup_int(xfs_da_state_t state, int result);
f5ea1100 DC	301	int xfs_da3_path_shift(xfs_da_state_t state, xfs_da_state_path_t path,
1da177e4 LT	302	int forward, int release, int *result);
	303	/*
	304	* Utility routines.
	305	*/
f5ea1100	306	int xfs_da3_blk_link(xfs_da_state_t state, xfs_da_state_blk_t old_blk,
1da177e4	307	xfs_da_state_blk_t *new_blk);
f5ea1100	308	int xfs_da3_node_read(struct xfs_trans tp, struct xfs_inode dp,
d9392a4b DC	309	xfs_dablk_t bno, xfs_daddr_t mappedbno,
d9392a4b DC	310	struct xfs_buf **bpp, int which_fork);
1da177e4 LT	311
	312	/*
	313	* Utility routines.
	314	*/
	315	int xfs_da_grow_inode(xfs_da_args_t args, xfs_dablk_t new_blkno);
77936d02 CH	316	int xfs_da_grow_inode_int(struct xfs_da_args args, xfs_fileoff_t bno,
77936d02 CH	317	int count);
1da177e4 LT	318	int xfs_da_get_buf(struct xfs_trans trans, struct xfs_inode dp,
1da177e4 LT	319	xfs_dablk_t bno, xfs_daddr_t mappedbno,
1d9025e5	320	struct xfs_buf **bp, int whichfork);
1da177e4 LT	321	int xfs_da_read_buf(struct xfs_trans trans, struct xfs_inode dp,
1da177e4 LT	322	xfs_dablk_t bno, xfs_daddr_t mappedbno,
4bb20a83	323	struct xfs_buf **bpp, int whichfork,
1813dd64	324	const struct xfs_buf_ops *ops);
1da177e4	325	xfs_daddr_t xfs_da_reada_buf(struct xfs_trans trans, struct xfs_inode dp,
da6958c8	326	xfs_dablk_t bno, xfs_daddr_t mapped_bno,
1813dd64	327	int whichfork, const struct xfs_buf_ops *ops);
1da177e4	328	int xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
1d9025e5	329	struct xfs_buf *dead_buf);
1da177e4	330
a5687787	331	uint xfs_da_hashname(const __uint8_t *name_string, int name_length);
5163f95a	332	enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
2bc75421	333	const unsigned char *name, int len);
5163f95a BN	334
5163f95a BN	335
1da177e4 LT	336	xfs_da_state_t *xfs_da_state_alloc(void);
1da177e4 LT	337	void xfs_da_state_free(xfs_da_state_t *state);
1da177e4	338
1da177e4	339	extern struct kmem_zone *xfs_da_state_zone;
24418492	340	extern const struct xfs_nameops xfs_default_nameops;
1da177e4 LT	341
1da177e4 LT	342	#endif /* __XFS_DA_BTREE_H__ */