fs/xfs/xfs_dir_sf.h

   1 /*
   2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_DIR_SF_H__
  33 #define __XFS_DIR_SF_H__
  34
  35 /*
  36  * Directory layout when stored internal to an inode.
  37  *
  38  * Small directories are packed as tightly as possible so as to
  39  * fit into the literal area of the inode.
  40  */
  41
  42 typedef struct { __uint8_t i[sizeof(xfs_ino_t)]; } xfs_dir_ino_t;
  43
  44 /*
  45  * The parent directory has a dedicated field, and the self-pointer must
  46  * be calculated on the fly.
  47  *
  48  * Entries are packed toward the top as tight as possible.  The header
  49  * and the elements much be memcpy'd out into a work area to get correct
  50  * alignment for the inode number fields.
  51  */
  52 typedef struct xfs_dir_shortform {
  53         struct xfs_dir_sf_hdr {         /* constant-structure header block */
  54                 xfs_dir_ino_t parent;   /* parent dir inode number */
  55                 __uint8_t count;        /* count of active entries */
  56         } hdr;
  57         struct xfs_dir_sf_entry {
  58                 xfs_dir_ino_t inumber;  /* referenced inode number */
  59                 __uint8_t namelen;      /* actual length of name (no NULL) */
  60                 __uint8_t name[1];      /* name */
  61         } list[1];                      /* variable sized array */
  62 } xfs_dir_shortform_t;
  63 typedef struct xfs_dir_sf_hdr xfs_dir_sf_hdr_t;
  64 typedef struct xfs_dir_sf_entry xfs_dir_sf_entry_t;
  65
  66 /*
  67  * We generate this then sort it, so that readdirs are returned in
  68  * hash-order.  Else seekdir won't work.
  69  */
  70 typedef struct xfs_dir_sf_sort {
  71         __uint8_t       entno;          /* .=0, ..=1, else entry# + 2 */
  72         __uint8_t       seqno;          /* sequence # with same hash value */
  73         __uint8_t       namelen;        /* length of name value (no null) */
  74         xfs_dahash_t    hash;           /* this entry's hash value */
  75         xfs_intino_t    ino;            /* this entry's inode number */
  76         char            *name;          /* name value, pointer into buffer */
  77 } xfs_dir_sf_sort_t;
  78
  79 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_GET_DIRINO)
  80 void xfs_dir_sf_get_dirino(xfs_dir_ino_t *from, xfs_ino_t *to);
  81 #define XFS_DIR_SF_GET_DIRINO(from,to)              xfs_dir_sf_get_dirino(from, to)
  82 #else
  83 #define XFS_DIR_SF_GET_DIRINO(from,to)              (*(to) = XFS_GET_DIR_INO8(*from))
  84 #endif
  85 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_PUT_DIRINO)
  86 void xfs_dir_sf_put_dirino(xfs_ino_t *from, xfs_dir_ino_t *to);
  87 #define XFS_DIR_SF_PUT_DIRINO(from,to)    xfs_dir_sf_put_dirino(from, to)
  88 #else
  89 #define XFS_DIR_SF_PUT_DIRINO(from,to)    XFS_PUT_DIR_INO8(*(from), *(to))
  90 #endif
  91 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ENTSIZE_BYNAME)
  92 int xfs_dir_sf_entsize_byname(int len);
  93 #define XFS_DIR_SF_ENTSIZE_BYNAME(len)          xfs_dir_sf_entsize_byname(len)
  94 #else
  95 #define XFS_DIR_SF_ENTSIZE_BYNAME(len)          /* space a name uses */ \
  96         ((uint)sizeof(xfs_dir_sf_entry_t)-1 + (len))
  97 #endif
  98 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ENTSIZE_BYENTRY)
  99 int xfs_dir_sf_entsize_byentry(xfs_dir_sf_entry_t *sfep);
 100 #define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep)        xfs_dir_sf_entsize_byentry(sfep)
 101 #else
 102 #define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep)        /* space an entry uses */ \
 103         ((uint)sizeof(xfs_dir_sf_entry_t)-1 + (sfep)->namelen)
 104 #endif
 105 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_NEXTENTRY)
 106 xfs_dir_sf_entry_t *xfs_dir_sf_nextentry(xfs_dir_sf_entry_t *sfep);
 107 #define XFS_DIR_SF_NEXTENTRY(sfep)              xfs_dir_sf_nextentry(sfep)
 108 #else
 109 #define XFS_DIR_SF_NEXTENTRY(sfep)              /* next entry in struct */ \
 110         ((xfs_dir_sf_entry_t *) \
 111                 ((char *)(sfep) + XFS_DIR_SF_ENTSIZE_BYENTRY(sfep)))
 112 #endif
 113 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR_SF_ALLFIT)
 114 int xfs_dir_sf_allfit(int count, int totallen);
 115 #define XFS_DIR_SF_ALLFIT(count,totallen)       \
 116         xfs_dir_sf_allfit(count,totallen)
 117 #else
 118 #define XFS_DIR_SF_ALLFIT(count,totallen)       /* will all entries fit? */ \
 119         ((uint)sizeof(xfs_dir_sf_hdr_t) + \
 120                ((uint)sizeof(xfs_dir_sf_entry_t)-1)*(count) + (totallen))
 121 #endif
 122
 123 #if defined(XFS_DIR_TRACE)
 124
 125 /*
 126  * Kernel tracing support for directories.
 127  */
 128 struct uio;
 129 struct xfs_inode;
 130 struct xfs_da_intnode;
 131 struct xfs_dinode;
 132 struct xfs_dir_leafblock;
 133 struct xfs_dir_leaf_entry;
 134
 135 #define XFS_DIR_TRACE_SIZE      4096    /* size of global trace buffer */
 136 extern ktrace_t *xfs_dir_trace_buf;
 137
 138 /*
 139  * Trace record types.
 140  */
 141 #define XFS_DIR_KTRACE_G_DU     1       /* dp, uio */
 142 #define XFS_DIR_KTRACE_G_DUB    2       /* dp, uio, bno */
 143 #define XFS_DIR_KTRACE_G_DUN    3       /* dp, uio, node */
 144 #define XFS_DIR_KTRACE_G_DUL    4       /* dp, uio, leaf */
 145 #define XFS_DIR_KTRACE_G_DUE    5       /* dp, uio, leaf entry */
 146 #define XFS_DIR_KTRACE_G_DUC    6       /* dp, uio, cookie */
 147
 148 void xfs_dir_trace_g_du(char *where, struct xfs_inode *dp, struct uio *uio);
 149 void xfs_dir_trace_g_dub(char *where, struct xfs_inode *dp, struct uio *uio,
 150                               xfs_dablk_t bno);
 151 void xfs_dir_trace_g_dun(char *where, struct xfs_inode *dp, struct uio *uio,
 152                               struct xfs_da_intnode *node);
 153 void xfs_dir_trace_g_dul(char *where, struct xfs_inode *dp, struct uio *uio,
 154                               struct xfs_dir_leafblock *leaf);
 155 void xfs_dir_trace_g_due(char *where, struct xfs_inode *dp, struct uio *uio,
 156                               struct xfs_dir_leaf_entry *entry);
 157 void xfs_dir_trace_g_duc(char *where, struct xfs_inode *dp, struct uio *uio,
 158                               xfs_off_t cookie);
 159 void xfs_dir_trace_enter(int type, char *where,
 160                              void *a0, void *a1, void *a2, void *a3,
 161                              void *a4, void *a5, void *a6, void *a7,
 162                              void *a8, void *a9, void *a10, void *a11);
 163 #else
 164 #define xfs_dir_trace_g_du(w,d,u)
 165 #define xfs_dir_trace_g_dub(w,d,u,b)
 166 #define xfs_dir_trace_g_dun(w,d,u,n)
 167 #define xfs_dir_trace_g_dul(w,d,u,l)
 168 #define xfs_dir_trace_g_due(w,d,u,e)
 169 #define xfs_dir_trace_g_duc(w,d,u,c)
 170 #endif /* DEBUG */
 171
 172 #endif  /* __XFS_DIR_SF_H__ */