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[XFS] Remove version 1 directory code. Never functioned on Linux, just

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pure bloat.

SGI-PV: 952969
SGI-Modid: xfs-linux-melb:xfs-kern:26251a

Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott
2006-06-20 13:04:51 +10:00
parent da2f4d679c
commit f6c2d1fa63
71 changed files with 285 additions and 4595 deletions
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391
fs/xfs/xfs_dir2.c
View File

@@ -24,21 +24,18 @@
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_dir_leaf.h"
#include "xfs_dir2_data.h"
#include "xfs_dir2_leaf.h"
#include "xfs_dir2_block.h"
@@ -46,69 +43,14 @@
#include "xfs_dir2_trace.h"
#include "xfs_error.h"
/*
* Declarations for interface routines.
*/
static void xfs_dir2_mount(xfs_mount_t *mp);
static int xfs_dir2_isempty(xfs_inode_t *dp);
static int xfs_dir2_init(xfs_trans_t *tp, xfs_inode_t *dp,
xfs_inode_t *pdp);
static int xfs_dir2_createname(xfs_trans_t *tp, xfs_inode_t *dp,
char *name, int namelen, xfs_ino_t inum,
xfs_fsblock_t *first,
xfs_bmap_free_t *flist, xfs_extlen_t total);
static int xfs_dir2_lookup(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
int namelen, xfs_ino_t *inum);
static int xfs_dir2_removename(xfs_trans_t *tp, xfs_inode_t *dp,
char *name, int namelen, xfs_ino_t ino,
xfs_fsblock_t *first,
xfs_bmap_free_t *flist, xfs_extlen_t total);
static int xfs_dir2_getdents(xfs_trans_t *tp, xfs_inode_t *dp, uio_t *uio,
int *eofp);
static int xfs_dir2_replace(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
int namelen, xfs_ino_t inum,
xfs_fsblock_t *first, xfs_bmap_free_t *flist,
xfs_extlen_t total);
static int xfs_dir2_canenter(xfs_trans_t *tp, xfs_inode_t *dp, char *name,
int namelen);
static int xfs_dir2_shortform_validate_ondisk(xfs_mount_t *mp,
xfs_dinode_t *dip);
/*
* Utility routine declarations.
*/
static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
/*
* Directory operations vector.
*/
xfs_dirops_t xfsv2_dirops = {
.xd_mount = xfs_dir2_mount,
.xd_isempty = xfs_dir2_isempty,
.xd_init = xfs_dir2_init,
.xd_createname = xfs_dir2_createname,
.xd_lookup = xfs_dir2_lookup,
.xd_removename = xfs_dir2_removename,
.xd_getdents = xfs_dir2_getdents,
.xd_replace = xfs_dir2_replace,
.xd_canenter = xfs_dir2_canenter,
.xd_shortform_validate_ondisk = xfs_dir2_shortform_validate_ondisk,
.xd_shortform_to_single = xfs_dir2_sf_to_block,
};
/*
* Interface routines.
*/
/*
* Initialize directory-related fields in the mount structure.
*/
static void
xfs_dir2_mount(
xfs_mount_t *mp) /* filesystem mount point */
void
xfs_dir_mount(
xfs_mount_t *mp)
{
mp->m_dirversion = 2;
ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
XFS_MAX_BLOCKSIZE);
mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
@@ -128,73 +70,99 @@ xfs_dir2_mount(
/*
* Return 1 if directory contains only "." and "..".
*/
static int /* return code */
xfs_dir2_isempty(
xfs_inode_t *dp) /* incore inode structure */
int
xfs_dir_isempty(
xfs_inode_t *dp)
{
xfs_dir2_sf_t *sfp; /* shortform directory structure */
xfs_dir2_sf_t *sfp;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
/*
* Might happen during shutdown.
*/
if (dp->i_d.di_size == 0) {
if (dp->i_d.di_size == 0) /* might happen during shutdown. */
return 1;
}
if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
return 0;
sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
return !sfp->hdr.count;
}
/*
* Validate a given inode number.
*/
int
xfs_dir_ino_validate(
xfs_mount_t *mp,
xfs_ino_t ino)
{
xfs_agblock_t agblkno;
xfs_agino_t agino;
xfs_agnumber_t agno;
int ino_ok;
int ioff;
agno = XFS_INO_TO_AGNO(mp, ino);
agblkno = XFS_INO_TO_AGBNO(mp, ino);
ioff = XFS_INO_TO_OFFSET(mp, ino);
agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
ino_ok =
agno < mp->m_sb.sb_agcount &&
agblkno < mp->m_sb.sb_agblocks &&
agblkno != 0 &&
ioff < (1 << mp->m_sb.sb_inopblog) &&
XFS_AGINO_TO_INO(mp, agno, agino) == ino;
if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
XFS_RANDOM_DIR_INO_VALIDATE))) {
xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
(unsigned long long) ino);
XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
return 0;
}
/*
* Initialize a directory with its "." and ".." entries.
*/
static int /* error */
xfs_dir2_init(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
xfs_inode_t *pdp) /* incore parent directory inode */
int
xfs_dir_init(
xfs_trans_t *tp,
xfs_inode_t *dp,
xfs_inode_t *pdp)
{
xfs_da_args_t args; /* operation arguments */
int error; /* error return value */
xfs_da_args_t args;
int error;
memset((char *)&args, 0, sizeof(args));
args.dp = dp;
args.trans = tp;
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino))) {
if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
return error;
}
return xfs_dir2_sf_create(&args, pdp->i_ino);
}
/*
Enter a name in a directory.
*/
static int /* error */
xfs_dir2_createname(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
char *name, /* new entry name */
int namelen, /* new entry name length */
int
xfs_dir_createname(
xfs_trans_t *tp,
xfs_inode_t *dp,
char *name,
int namelen,
xfs_ino_t inum, /* new entry inode number */
xfs_fsblock_t *first, /* bmap's firstblock */
xfs_bmap_free_t *flist, /* bmap's freeblock list */
xfs_extlen_t total) /* bmap's total block count */
{
xfs_da_args_t args; /* operation arguments */
int rval; /* return value */
xfs_da_args_t args;
int rval;
int v; /* type-checking value */
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
return rval;
}
XFS_STATS_INC(xs_dir_create);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
@@ -207,18 +175,16 @@ xfs_dir2_createname(
args.trans = tp;
args.justcheck = 0;
args.addname = args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_addname(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_block_addname(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_leaf_addname(&args);
else
rval = xfs_dir2_node_addname(&args);
@@ -228,24 +194,21 @@ xfs_dir2_createname(
/*
* Lookup a name in a directory, give back the inode number.
*/
static int /* error */
xfs_dir2_lookup(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
char *name, /* lookup name */
int namelen, /* lookup name length */
int
xfs_dir_lookup(
xfs_trans_t *tp,
xfs_inode_t *dp,
char *name,
int namelen,
xfs_ino_t *inum) /* out: inode number */
{
xfs_da_args_t args; /* operation arguments */
int rval; /* return value */
xfs_da_args_t args;
int rval;
int v; /* type-checking value */
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
XFS_STATS_INC(xs_dir_lookup);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
@@ -258,18 +221,16 @@ xfs_dir2_lookup(
args.trans = tp;
args.justcheck = args.addname = 0;
args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_lookup(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_block_lookup(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_leaf_lookup(&args);
else
rval = xfs_dir2_node_lookup(&args);
@@ -283,26 +244,24 @@ xfs_dir2_lookup(
/*
* Remove an entry from a directory.
*/
static int /* error */
xfs_dir2_removename(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
char *name, /* name of entry to remove */
int namelen, /* name length of entry to remove */
xfs_ino_t ino, /* inode number of entry to remove */
int
xfs_dir_removename(
xfs_trans_t *tp,
xfs_inode_t *dp,
char *name,
int namelen,
xfs_ino_t ino,
xfs_fsblock_t *first, /* bmap's firstblock */
xfs_bmap_free_t *flist, /* bmap's freeblock list */
xfs_extlen_t total) /* bmap's total block count */
{
xfs_da_args_t args; /* operation arguments */
int rval; /* return value */
xfs_da_args_t args;
int rval;
int v; /* type-checking value */
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
XFS_STATS_INC(xs_dir_remove);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
@@ -314,18 +273,16 @@ xfs_dir2_removename(
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
args.justcheck = args.addname = args.oknoent = 0;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_removename(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_block_removename(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_leaf_removename(&args);
else
rval = xfs_dir2_node_removename(&args);
@@ -335,10 +292,10 @@ xfs_dir2_removename(
/*
* Read a directory.
*/
static int /* error */
xfs_dir2_getdents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
int
xfs_dir_getdents(
xfs_trans_t *tp,
xfs_inode_t *dp,
uio_t *uio, /* caller's buffer control */
int *eofp) /* out: eof reached */
{
@@ -367,14 +324,11 @@ xfs_dir2_getdents(
}
*eofp = 0;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
;
} else if (v)
else if (v)
rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
else
rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
@@ -386,29 +340,26 @@ xfs_dir2_getdents(
/*
* Replace the inode number of a directory entry.
*/
static int /* error */
xfs_dir2_replace(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
int
xfs_dir_replace(
xfs_trans_t *tp,
xfs_inode_t *dp,
char *name, /* name of entry to replace */
int namelen, /* name length of entry to replace */
int namelen,
xfs_ino_t inum, /* new inode number */
xfs_fsblock_t *first, /* bmap's firstblock */
xfs_bmap_free_t *flist, /* bmap's freeblock list */
xfs_extlen_t total) /* bmap's total block count */
{
xfs_da_args_t args; /* operation arguments */
int rval; /* return value */
xfs_da_args_t args;
int rval;
int v; /* type-checking value */
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum))) {
if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
return rval;
}
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
@@ -420,18 +371,16 @@ xfs_dir2_replace(
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
args.justcheck = args.addname = args.oknoent = 0;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_replace(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_block_replace(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_leaf_replace(&args);
else
rval = xfs_dir2_node_replace(&args);
@@ -441,21 +390,19 @@ xfs_dir2_replace(
/*
* See if this entry can be added to the directory without allocating space.
*/
static int /* error */
xfs_dir2_canenter(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
int
xfs_dir_canenter(
xfs_trans_t *tp,
xfs_inode_t *dp,
char *name, /* name of entry to add */
int namelen) /* name length of entry to add */
int namelen)
{
xfs_da_args_t args; /* operation arguments */
int rval; /* return value */
xfs_da_args_t args;
int rval;
int v; /* type-checking value */
ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
/*
* Fill in the arg structure for this request.
*/
args.name = name;
args.namelen = namelen;
args.hashval = xfs_da_hashname(name, namelen);
@@ -467,37 +414,22 @@ xfs_dir2_canenter(
args.whichfork = XFS_DATA_FORK;
args.trans = tp;
args.justcheck = args.addname = args.oknoent = 1;
/*
* Decide on what work routines to call based on the inode size.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_addname(&args);
else if ((rval = xfs_dir2_isblock(tp, dp, &v))) {
else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_block_addname(&args);
else if ((rval = xfs_dir2_isleaf(tp, dp, &v))) {
else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
return rval;
} else if (v)
else if (v)
rval = xfs_dir2_leaf_addname(&args);
else
rval = xfs_dir2_node_addname(&args);
return rval;
}
/*
* Dummy routine for shortform inode validation.
* Can't really do this.
*/
/* ARGSUSED */
static int /* error */
xfs_dir2_shortform_validate_ondisk(
xfs_mount_t *mp, /* filesystem mount point */
xfs_dinode_t *dip) /* ondisk inode */
{
return 0;
}
/*
* Utility routines.
*/
@@ -507,24 +439,24 @@ xfs_dir2_shortform_validate_ondisk(
* This routine is for data and free blocks, not leaf/node blocks
* which are handled by xfs_da_grow_inode.
*/
int /* error */
int
xfs_dir2_grow_inode(
xfs_da_args_t *args, /* operation arguments */
xfs_da_args_t *args,
int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
xfs_dir2_db_t *dbp) /* out: block number added */
{
xfs_fileoff_t bno; /* directory offset of new block */
int count; /* count of filesystem blocks */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
int error;
int got; /* blocks actually mapped */
int i; /* temp mapping index */
int i;
xfs_bmbt_irec_t map; /* single structure for bmap */
int mapi; /* mapping index */
xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
xfs_mount_t *mp; /* filesystem mount point */
xfs_mount_t *mp;
int nmap; /* number of bmap entries */
xfs_trans_t *tp; /* transaction pointer */
xfs_trans_t *tp;
xfs_dir2_trace_args_s("grow_inode", args, space);
dp = args->dp;
@@ -538,9 +470,8 @@ xfs_dir2_grow_inode(
/*
* Find the first hole for our block.
*/
if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK))) {
if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
return error;
}
nmap = 1;
ASSERT(args->firstblock != NULL);
/*
@@ -549,13 +480,9 @@ xfs_dir2_grow_inode(
if ((error = xfs_bmapi(tp, dp, bno, count,
XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
args->firstblock, args->total, &map, &nmap,
args->flist, NULL))) {
args->flist, NULL)))
return error;
}
ASSERT(nmap <= 1);
/*
* Got it in 1.
*/
if (nmap == 1) {
mapp = &map;
mapi = 1;
@@ -646,20 +573,19 @@ xfs_dir2_grow_inode(
/*
* See if the directory is a single-block form directory.
*/
int /* error */
int
xfs_dir2_isblock(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
xfs_trans_t *tp,
xfs_inode_t *dp,
int *vp) /* out: 1 is block, 0 is not block */
{
xfs_fileoff_t last; /* last file offset */
xfs_mount_t *mp; /* filesystem mount point */
int rval; /* return value */
xfs_mount_t *mp;
int rval;
mp = dp->i_mount;
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
return rval;
}
rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
*vp = rval;
@@ -669,20 +595,19 @@ xfs_dir2_isblock(
/*
* See if the directory is a single-leaf form directory.
*/
int /* error */
int
xfs_dir2_isleaf(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *dp, /* incore directory inode */
xfs_trans_t *tp,
xfs_inode_t *dp,
int *vp) /* out: 1 is leaf, 0 is not leaf */
{
xfs_fileoff_t last; /* last file offset */
xfs_mount_t *mp; /* filesystem mount point */
int rval; /* return value */
xfs_mount_t *mp;
int rval;
mp = dp->i_mount;
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK))) {
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
return rval;
}
*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
return 0;
}
@@ -690,9 +615,9 @@ xfs_dir2_isleaf(
/*
* Getdents put routine for 64-bit ABI, direct form.
*/
static int /* error */
static int
xfs_dir2_put_dirent64_direct(
xfs_dir2_put_args_t *pa) /* argument bundle */
xfs_dir2_put_args_t *pa)
{
xfs_dirent_t *idbp; /* dirent pointer */
iovec_t *iovp; /* io vector */
@@ -727,9 +652,9 @@ xfs_dir2_put_dirent64_direct(
/*
* Getdents put routine for 64-bit ABI, uio form.
*/
static int /* error */
static int
xfs_dir2_put_dirent64_uio(
xfs_dir2_put_args_t *pa) /* argument bundle */
xfs_dir2_put_args_t *pa)
{
xfs_dirent_t *idbp; /* dirent pointer */
int namelen; /* entry name length */
@@ -765,17 +690,17 @@ xfs_dir2_put_dirent64_uio(
*/
int
xfs_dir2_shrink_inode(
xfs_da_args_t *args, /* operation arguments */
xfs_dir2_db_t db, /* directory block number */
xfs_dabuf_t *bp) /* block's buffer */
xfs_da_args_t *args,
xfs_dir2_db_t db,
xfs_dabuf_t *bp)
{
xfs_fileoff_t bno; /* directory file offset */
xfs_dablk_t da; /* directory file offset */
int done; /* bunmap is finished */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
xfs_mount_t *mp; /* filesystem mount point */
xfs_trans_t *tp; /* transaction pointer */
xfs_inode_t *dp;
int error;
xfs_mount_t *mp;
xfs_trans_t *tp;
xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
dp = args->dp;