273 lines
10 KiB
C
273 lines
10 KiB
C
/*
|
|
* Copyright (c) 2000,2002,2005 Silicon Graphics, 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_buf;
|
|
struct xfs_bmap_free;
|
|
struct xfs_inode;
|
|
struct xfs_mount;
|
|
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.
|
|
*
|
|
* Is 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;
|
|
|
|
/*
|
|
* 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_intnode {
|
|
struct xfs_da_node_hdr { /* constant-structure header block */
|
|
xfs_da_blkinfo_t info; /* block type, links, etc. */
|
|
__be16 count; /* count of active entries */
|
|
__be16 level; /* level above leaves (leaf == 0) */
|
|
} hdr;
|
|
struct xfs_da_node_entry {
|
|
__be32 hashval; /* hash value for this descendant */
|
|
__be32 before; /* Btree block before this key */
|
|
} btree[1]; /* variable sized array of keys */
|
|
} xfs_da_intnode_t;
|
|
typedef struct xfs_da_node_hdr xfs_da_node_hdr_t;
|
|
typedef struct xfs_da_node_entry xfs_da_node_entry_t;
|
|
|
|
#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 uchar_t *name; /* string (maybe not NULL terminated) */
|
|
int namelen; /* length of string (maybe no NULL) */
|
|
uchar_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 */
|
|
|
|
/*
|
|
* Structure to describe buffer(s) for a block.
|
|
* This is needed in the directory version 2 format case, when
|
|
* multiple non-contiguous fsblocks might be needed to cover one
|
|
* logical directory block.
|
|
* If the buffer count is 1 then the data pointer points to the
|
|
* same place as the b_addr field for the buffer, else to kmem_alloced memory.
|
|
*/
|
|
typedef struct xfs_dabuf {
|
|
int nbuf; /* number of buffer pointers present */
|
|
short dirty; /* data needs to be copied back */
|
|
short bbcount; /* how large is data in bbs */
|
|
void *data; /* pointer for buffers' data */
|
|
#ifdef XFS_DABUF_DEBUG
|
|
inst_t *ra; /* return address of caller to make */
|
|
struct xfs_dabuf *next; /* next in global chain */
|
|
struct xfs_dabuf *prev; /* previous in global chain */
|
|
struct xfs_buftarg *target; /* device for buffer */
|
|
xfs_daddr_t blkno; /* daddr first in bps[0] */
|
|
#endif
|
|
struct xfs_buf *bps[1]; /* actually nbuf of these */
|
|
} xfs_dabuf_t;
|
|
#define XFS_DA_BUF_SIZE(n) \
|
|
(sizeof(xfs_dabuf_t) + sizeof(struct xfs_buf *) * ((n) - 1))
|
|
|
|
#ifdef XFS_DABUF_DEBUG
|
|
extern xfs_dabuf_t *xfs_dabuf_global_list;
|
|
#endif
|
|
|
|
/*
|
|
* 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 {
|
|
xfs_dabuf_t *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 leafs */
|
|
/* 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 char *, int);
|
|
};
|
|
|
|
|
|
/*========================================================================
|
|
* Function prototypes.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Routines used for growing the Btree.
|
|
*/
|
|
int xfs_da_node_create(xfs_da_args_t *args, xfs_dablk_t blkno, int level,
|
|
xfs_dabuf_t **bpp, int whichfork);
|
|
int xfs_da_split(xfs_da_state_t *state);
|
|
|
|
/*
|
|
* Routines used for shrinking the Btree.
|
|
*/
|
|
int xfs_da_join(xfs_da_state_t *state);
|
|
void xfs_da_fixhashpath(xfs_da_state_t *state,
|
|
xfs_da_state_path_t *path_to_to_fix);
|
|
|
|
/*
|
|
* Routines used for finding things in the Btree.
|
|
*/
|
|
int xfs_da_node_lookup_int(xfs_da_state_t *state, int *result);
|
|
int xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
|
|
int forward, int release, int *result);
|
|
/*
|
|
* Utility routines.
|
|
*/
|
|
int xfs_da_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk,
|
|
xfs_da_state_blk_t *new_blk);
|
|
|
|
/*
|
|
* Utility routines.
|
|
*/
|
|
int xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno);
|
|
int xfs_da_get_buf(struct xfs_trans *trans, struct xfs_inode *dp,
|
|
xfs_dablk_t bno, xfs_daddr_t mappedbno,
|
|
xfs_dabuf_t **bp, int whichfork);
|
|
int xfs_da_read_buf(struct xfs_trans *trans, struct xfs_inode *dp,
|
|
xfs_dablk_t bno, xfs_daddr_t mappedbno,
|
|
xfs_dabuf_t **bpp, int whichfork);
|
|
xfs_daddr_t xfs_da_reada_buf(struct xfs_trans *trans, struct xfs_inode *dp,
|
|
xfs_dablk_t bno, int whichfork);
|
|
int xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
|
|
xfs_dabuf_t *dead_buf);
|
|
|
|
uint xfs_da_hashname(const uchar_t *name_string, int name_length);
|
|
enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
|
|
const char *name, int len);
|
|
|
|
|
|
xfs_da_state_t *xfs_da_state_alloc(void);
|
|
void xfs_da_state_free(xfs_da_state_t *state);
|
|
|
|
void xfs_da_buf_done(xfs_dabuf_t *dabuf);
|
|
void xfs_da_log_buf(struct xfs_trans *tp, xfs_dabuf_t *dabuf, uint first,
|
|
uint last);
|
|
void xfs_da_brelse(struct xfs_trans *tp, xfs_dabuf_t *dabuf);
|
|
void xfs_da_binval(struct xfs_trans *tp, xfs_dabuf_t *dabuf);
|
|
xfs_daddr_t xfs_da_blkno(xfs_dabuf_t *dabuf);
|
|
|
|
extern struct kmem_zone *xfs_da_state_zone;
|
|
extern struct kmem_zone *xfs_dabuf_zone;
|
|
|
|
#endif /* __XFS_DA_BTREE_H__ */
|