Viewing file:  xfs_dir_sf.h (5.23 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Copyright (c) 2000,2005 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_DIR_SF_H__
#define __XFS_DIR_SF_H__
/*
* Directory layout when stored internal to an inode.
*
* Small directories are packed as tightly as possible so as to
* fit into the literal area of the inode.
*/
typedef struct { __uint8_t i[sizeof(xfs_ino_t)]; } xfs_dir_ino_t;
/*
* The parent directory has a dedicated field, and the self-pointer must
* be calculated on the fly.
*
* Entries are packed toward the top as tight as possible. The header
* and the elements much be memcpy'd out into a work area to get correct
* alignment for the inode number fields.
*/
typedef struct xfs_dir_sf_hdr { /* constant-structure header block */
xfs_dir_ino_t parent; /* parent dir inode number */
__uint8_t count; /* count of active entries */
} xfs_dir_sf_hdr_t;
typedef struct xfs_dir_sf_entry {
xfs_dir_ino_t inumber; /* referenced inode number */
__uint8_t namelen; /* actual length of name (no NULL) */
__uint8_t name[1]; /* name */
} xfs_dir_sf_entry_t;
typedef struct xfs_dir_shortform {
xfs_dir_sf_hdr_t hdr;
xfs_dir_sf_entry_t list[1]; /* variable sized array */
} xfs_dir_shortform_t;
/*
* We generate this then sort it, so that readdirs are returned in
* hash-order. Else seekdir won't work.
*/
typedef struct xfs_dir_sf_sort {
__uint8_t entno; /* .=0, ..=1, else entry# + 2 */
__uint8_t seqno; /* sequence # with same hash value */
__uint8_t namelen; /* length of name value (no null) */
xfs_dahash_t hash; /* this entry's hash value */
xfs_intino_t ino; /* this entry's inode number */
char *name; /* name value, pointer into buffer */
} xfs_dir_sf_sort_t;
#define XFS_DIR_SF_GET_DIRINO(from,to) xfs_dir_sf_get_dirino(from, to)
static inline void xfs_dir_sf_get_dirino(xfs_dir_ino_t *from, xfs_ino_t *to)
{
*(to) = XFS_GET_DIR_INO8(*from);
}
#define XFS_DIR_SF_PUT_DIRINO(from,to) xfs_dir_sf_put_dirino(from, to)
static inline void xfs_dir_sf_put_dirino(xfs_ino_t *from, xfs_dir_ino_t *to)
{
XFS_PUT_DIR_INO8(*(from), *(to));
}
#define XFS_DIR_SF_ENTSIZE_BYNAME(len) xfs_dir_sf_entsize_byname(len)
static inline int xfs_dir_sf_entsize_byname(int len)
{
return (uint)sizeof(xfs_dir_sf_entry_t)-1 + (len);
}
#define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep) xfs_dir_sf_entsize_byentry(sfep)
static inline int xfs_dir_sf_entsize_byentry(xfs_dir_sf_entry_t *sfep)
{
return (uint)sizeof(xfs_dir_sf_entry_t)-1 + (sfep)->namelen;
}
#define XFS_DIR_SF_NEXTENTRY(sfep) xfs_dir_sf_nextentry(sfep)
static inline xfs_dir_sf_entry_t *xfs_dir_sf_nextentry(xfs_dir_sf_entry_t *sfep)
{
return (xfs_dir_sf_entry_t *) \
((char *)(sfep) + XFS_DIR_SF_ENTSIZE_BYENTRY(sfep));
}
#define XFS_DIR_SF_ALLFIT(count,totallen) \
xfs_dir_sf_allfit(count,totallen)
static inline int xfs_dir_sf_allfit(int count, int totallen)
{
return ((uint)sizeof(xfs_dir_sf_hdr_t) + \
((uint)sizeof(xfs_dir_sf_entry_t)-1)*(count) + (totallen));
}
#if defined(XFS_DIR_TRACE)
/*
* Kernel tracing support for directories.
*/
struct uio;
struct xfs_inode;
struct xfs_da_intnode;
struct xfs_dinode;
struct xfs_dir_leafblock;
struct xfs_dir_leaf_entry;
#define XFS_DIR_TRACE_SIZE 4096 /* size of global trace buffer */
extern ktrace_t *xfs_dir_trace_buf;
/*
* Trace record types.
*/
#define XFS_DIR_KTRACE_G_DU 1 /* dp, uio */
#define XFS_DIR_KTRACE_G_DUB 2 /* dp, uio, bno */
#define XFS_DIR_KTRACE_G_DUN 3 /* dp, uio, node */
#define XFS_DIR_KTRACE_G_DUL 4 /* dp, uio, leaf */
#define XFS_DIR_KTRACE_G_DUE 5 /* dp, uio, leaf entry */
#define XFS_DIR_KTRACE_G_DUC 6 /* dp, uio, cookie */
void xfs_dir_trace_g_du(char *where, struct xfs_inode *dp, struct uio *uio);
void xfs_dir_trace_g_dub(char *where, struct xfs_inode *dp, struct uio *uio,
xfs_dablk_t bno);
void xfs_dir_trace_g_dun(char *where, struct xfs_inode *dp, struct uio *uio,
struct xfs_da_intnode *node);
void xfs_dir_trace_g_dul(char *where, struct xfs_inode *dp, struct uio *uio,
struct xfs_dir_leafblock *leaf);
void xfs_dir_trace_g_due(char *where, struct xfs_inode *dp, struct uio *uio,
struct xfs_dir_leaf_entry *entry);
void xfs_dir_trace_g_duc(char *where, struct xfs_inode *dp, struct uio *uio,
xfs_off_t cookie);
void xfs_dir_trace_enter(int type, char *where,
void *a0, void *a1, void *a2, void *a3,
void *a4, void *a5, void *a6, void *a7,
void *a8, void *a9, void *a10, void *a11);
#else
#define xfs_dir_trace_g_du(w,d,u)
#define xfs_dir_trace_g_dub(w,d,u,b)
#define xfs_dir_trace_g_dun(w,d,u,n)
#define xfs_dir_trace_g_dul(w,d,u,l)
#define xfs_dir_trace_g_due(w,d,u,e)
#define xfs_dir_trace_g_duc(w,d,u,c)
#endif /* DEBUG */
#endif /* __XFS_DIR_SF_H__ */
|