mirror of https://gitee.com/openkylin/linux.git
173 lines
6.6 KiB
C
173 lines
6.6 KiB
C
/*
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* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_DIR_SF_H__
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#define __XFS_DIR_SF_H__
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/*
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* Directory layout when stored internal to an inode.
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*
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* Small directories are packed as tightly as possible so as to
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* fit into the literal area of the inode.
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*/
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typedef struct { __uint8_t i[sizeof(xfs_ino_t)]; } xfs_dir_ino_t;
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/*
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* The parent directory has a dedicated field, and the self-pointer must
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* be calculated on the fly.
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*
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* Entries are packed toward the top as tight as possible. The header
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* and the elements much be memcpy'd out into a work area to get correct
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* alignment for the inode number fields.
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*/
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typedef struct xfs_dir_shortform {
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struct xfs_dir_sf_hdr { /* constant-structure header block */
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xfs_dir_ino_t parent; /* parent dir inode number */
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__uint8_t count; /* count of active entries */
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} hdr;
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struct xfs_dir_sf_entry {
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xfs_dir_ino_t inumber; /* referenced inode number */
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__uint8_t namelen; /* actual length of name (no NULL) */
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__uint8_t name[1]; /* name */
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} list[1]; /* variable sized array */
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} xfs_dir_shortform_t;
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typedef struct xfs_dir_sf_hdr xfs_dir_sf_hdr_t;
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typedef struct xfs_dir_sf_entry xfs_dir_sf_entry_t;
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/*
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* We generate this then sort it, so that readdirs are returned in
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* hash-order. Else seekdir won't work.
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*/
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typedef struct xfs_dir_sf_sort {
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__uint8_t entno; /* .=0, ..=1, else entry# + 2 */
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__uint8_t seqno; /* sequence # with same hash value */
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__uint8_t namelen; /* length of name value (no null) */
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xfs_dahash_t hash; /* this entry's hash value */
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xfs_intino_t ino; /* this entry's inode number */
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char *name; /* name value, pointer into buffer */
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} xfs_dir_sf_sort_t;
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_GET_DIRINO)
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void xfs_dir_sf_get_dirino(xfs_dir_ino_t *from, xfs_ino_t *to);
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#define XFS_DIR_SF_GET_DIRINO(from,to) xfs_dir_sf_get_dirino(from, to)
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#else
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#define XFS_DIR_SF_GET_DIRINO(from,to) (*(to) = XFS_GET_DIR_INO8(*from))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_PUT_DIRINO)
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void xfs_dir_sf_put_dirino(xfs_ino_t *from, xfs_dir_ino_t *to);
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#define XFS_DIR_SF_PUT_DIRINO(from,to) xfs_dir_sf_put_dirino(from, to)
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#else
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#define XFS_DIR_SF_PUT_DIRINO(from,to) XFS_PUT_DIR_INO8(*(from), *(to))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ENTSIZE_BYNAME)
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int xfs_dir_sf_entsize_byname(int len);
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#define XFS_DIR_SF_ENTSIZE_BYNAME(len) xfs_dir_sf_entsize_byname(len)
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#else
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#define XFS_DIR_SF_ENTSIZE_BYNAME(len) /* space a name uses */ \
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((uint)sizeof(xfs_dir_sf_entry_t)-1 + (len))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ENTSIZE_BYENTRY)
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int xfs_dir_sf_entsize_byentry(xfs_dir_sf_entry_t *sfep);
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#define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep) xfs_dir_sf_entsize_byentry(sfep)
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#else
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#define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep) /* space an entry uses */ \
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((uint)sizeof(xfs_dir_sf_entry_t)-1 + (sfep)->namelen)
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_NEXTENTRY)
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xfs_dir_sf_entry_t *xfs_dir_sf_nextentry(xfs_dir_sf_entry_t *sfep);
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#define XFS_DIR_SF_NEXTENTRY(sfep) xfs_dir_sf_nextentry(sfep)
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#else
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#define XFS_DIR_SF_NEXTENTRY(sfep) /* next entry in struct */ \
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((xfs_dir_sf_entry_t *) \
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((char *)(sfep) + XFS_DIR_SF_ENTSIZE_BYENTRY(sfep)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ALLFIT)
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int xfs_dir_sf_allfit(int count, int totallen);
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#define XFS_DIR_SF_ALLFIT(count,totallen) \
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xfs_dir_sf_allfit(count,totallen)
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#else
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#define XFS_DIR_SF_ALLFIT(count,totallen) /* will all entries fit? */ \
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((uint)sizeof(xfs_dir_sf_hdr_t) + \
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((uint)sizeof(xfs_dir_sf_entry_t)-1)*(count) + (totallen))
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#endif
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#if defined(XFS_DIR_TRACE)
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/*
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* Kernel tracing support for directories.
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*/
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struct uio;
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struct xfs_inode;
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struct xfs_da_intnode;
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struct xfs_dinode;
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struct xfs_dir_leafblock;
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struct xfs_dir_leaf_entry;
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#define XFS_DIR_TRACE_SIZE 4096 /* size of global trace buffer */
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extern ktrace_t *xfs_dir_trace_buf;
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/*
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* Trace record types.
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*/
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#define XFS_DIR_KTRACE_G_DU 1 /* dp, uio */
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#define XFS_DIR_KTRACE_G_DUB 2 /* dp, uio, bno */
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#define XFS_DIR_KTRACE_G_DUN 3 /* dp, uio, node */
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#define XFS_DIR_KTRACE_G_DUL 4 /* dp, uio, leaf */
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#define XFS_DIR_KTRACE_G_DUE 5 /* dp, uio, leaf entry */
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#define XFS_DIR_KTRACE_G_DUC 6 /* dp, uio, cookie */
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void xfs_dir_trace_g_du(char *where, struct xfs_inode *dp, struct uio *uio);
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void xfs_dir_trace_g_dub(char *where, struct xfs_inode *dp, struct uio *uio,
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xfs_dablk_t bno);
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void xfs_dir_trace_g_dun(char *where, struct xfs_inode *dp, struct uio *uio,
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struct xfs_da_intnode *node);
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void xfs_dir_trace_g_dul(char *where, struct xfs_inode *dp, struct uio *uio,
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struct xfs_dir_leafblock *leaf);
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void xfs_dir_trace_g_due(char *where, struct xfs_inode *dp, struct uio *uio,
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struct xfs_dir_leaf_entry *entry);
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void xfs_dir_trace_g_duc(char *where, struct xfs_inode *dp, struct uio *uio,
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xfs_off_t cookie);
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void xfs_dir_trace_enter(int type, char *where,
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void *a0, void *a1, void *a2, void *a3,
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void *a4, void *a5, void *a6, void *a7,
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void *a8, void *a9, void *a10, void *a11);
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#else
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#define xfs_dir_trace_g_du(w,d,u)
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#define xfs_dir_trace_g_dub(w,d,u,b)
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#define xfs_dir_trace_g_dun(w,d,u,n)
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#define xfs_dir_trace_g_dul(w,d,u,l)
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#define xfs_dir_trace_g_due(w,d,u,e)
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#define xfs_dir_trace_g_duc(w,d,u,c)
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#endif /* DEBUG */
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#endif /* __XFS_DIR_SF_H__ */
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