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alistair23-linux/fs/xfs/xfs_bmap_btree.h
Dave Chinner 1813dd6405 xfs: convert buffer verifiers to an ops structure. 
To separate the verifiers from iodone functions and associate read
and write verifiers at the same time, introduce a buffer verifier
operations structure to the xfs_buf.

This avoids the need for assigning the write verifier, clearing the
iodone function and re-running ioend processing in the read
verifier, and gets rid of the nasty "b_pre_io" name for the write
verifier function pointer. If we ever need to, it will also be
easier to add further content specific callbacks to a buffer with an
ops structure in place.

We also avoid needing to export verifier functions, instead we
can simply export the ops structures for those that are needed
outside the function they are defined in.

This patch also fixes a directory block readahead verifier issue
it exposed.

This patch also adds ops callbacks to the inode/alloc btree blocks
initialised by growfs. These will need more work before they will
work with CRCs.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-11-15 21:35:12 -06:00

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/*
* 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_BMAP_BTREE_H__
#define __XFS_BMAP_BTREE_H__
#define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
struct xfs_btree_cur;
struct xfs_btree_block;
struct xfs_mount;
struct xfs_inode;
struct xfs_trans;
/*
* Bmap root header, on-disk form only.
*/
typedef struct xfs_bmdr_block {
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
} xfs_bmdr_block_t;
/*
* Bmap btree record and extent descriptor.
* l0:63 is an extent flag (value 1 indicates non-normal).
* l0:9-62 are startoff.
* l0:0-8 and l1:21-63 are startblock.
* l1:0-20 are blockcount.
*/
#define BMBT_EXNTFLAG_BITLEN 1
#define BMBT_STARTOFF_BITLEN 54
#define BMBT_STARTBLOCK_BITLEN 52
#define BMBT_BLOCKCOUNT_BITLEN 21
typedef struct xfs_bmbt_rec {
__be64 l0, l1;
} xfs_bmbt_rec_t;
typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
typedef struct xfs_bmbt_rec_host {
__uint64_t l0, l1;
} xfs_bmbt_rec_host_t;
/*
* Values and macros for delayed-allocation startblock fields.
*/
#define STARTBLOCKVALBITS 17
#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
#define DSTARTBLOCKMASKBITS (15 + 20)
#define STARTBLOCKMASK \
(((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
#define DSTARTBLOCKMASK \
(((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
static inline int isnullstartblock(xfs_fsblock_t x)
{
return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
}
static inline int isnulldstartblock(xfs_dfsbno_t x)
{
return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
}
static inline xfs_fsblock_t nullstartblock(int k)
{
ASSERT(k < (1 << STARTBLOCKVALBITS));
return STARTBLOCKMASK | (k);
}
static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
{
return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
}
/*
* Possible extent formats.
*/
typedef enum {
XFS_EXTFMT_NOSTATE = 0,
XFS_EXTFMT_HASSTATE
} xfs_exntfmt_t;
/*
* Possible extent states.
*/
typedef enum {
XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
} xfs_exntst_t;
/*
* Extent state and extent format macros.
*/
#define XFS_EXTFMT_INODE(x) \
(xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
/*
* Incore version of above.
*/
typedef struct xfs_bmbt_irec
{
xfs_fileoff_t br_startoff; /* starting file offset */
xfs_fsblock_t br_startblock; /* starting block number */
xfs_filblks_t br_blockcount; /* number of blocks */
xfs_exntst_t br_state; /* extent state */
} xfs_bmbt_irec_t;
/*
* Key structure for non-leaf levels of the tree.
*/
typedef struct xfs_bmbt_key {
__be64 br_startoff; /* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;
/* btree pointer type */
typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
/*
* Btree block header size depends on a superblock flag.
*
* (not quite yet, but soon)
*/
#define XFS_BMBT_BLOCK_LEN(mp) XFS_BTREE_LBLOCK_LEN
#define XFS_BMBT_REC_ADDR(mp, block, index) \
((xfs_bmbt_rec_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
((index) - 1) * sizeof(xfs_bmbt_rec_t)))
#define XFS_BMBT_KEY_ADDR(mp, block, index) \
((xfs_bmbt_key_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
((index) - 1) * sizeof(xfs_bmbt_key_t)))
#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
((xfs_bmbt_ptr_t *) \
((char *)(block) + \
XFS_BMBT_BLOCK_LEN(mp) + \
(maxrecs) * sizeof(xfs_bmbt_key_t) + \
((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
#define XFS_BMDR_REC_ADDR(block, index) \
((xfs_bmdr_rec_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
((index) - 1) * sizeof(xfs_bmdr_rec_t)))
#define XFS_BMDR_KEY_ADDR(block, index) \
((xfs_bmdr_key_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
((index) - 1) * sizeof(xfs_bmdr_key_t)))
#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
((xfs_bmdr_ptr_t *) \
((char *)(block) + \
sizeof(struct xfs_bmdr_block) + \
(maxrecs) * sizeof(xfs_bmdr_key_t) + \
((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
/*
* These are to be used when we know the size of the block and
* we don't have a cursor.
*/
#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
#define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
(int)(XFS_BTREE_LBLOCK_LEN + \
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
#define XFS_BMAP_BROOT_SPACE(bb) \
(XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
#define XFS_BMDR_SPACE_CALC(nrecs) \
(int)(sizeof(xfs_bmdr_block_t) + \
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
/*
* Maximum number of bmap btree levels.
*/
#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
/*
* Prototypes for xfs_bmap.c to call.
*/
extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
struct xfs_btree_block *, int);
extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
xfs_bmdr_block_t *, int);
extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
struct xfs_trans *, struct xfs_inode *, int);
extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
#endif /* __XFS_BMAP_BTREE_H__ */
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