fs/xfs/xfs_attr_sf.h

   1 /*
   2  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_ATTR_SF_H__
  19 #define __XFS_ATTR_SF_H__
  20
  21 /*
  22  * Attribute storage when stored inside the inode.
  23  *
  24  * Small attribute lists are packed as tightly as possible so as
  25  * to fit into the literal area of the inode.
  26  */
  27
  28 struct xfs_inode;
  29
  30 /*
  31  * Entries are packed toward the top as tight as possible.
  32  */
  33 typedef struct xfs_attr_shortform {
  34         struct xfs_attr_sf_hdr {        /* constant-structure header block */
  35                 __be16  totsize;        /* total bytes in shortform list */
  36                 __u8    count;  /* count of active entries */
  37         } hdr;
  38         struct xfs_attr_sf_entry {
  39                 __uint8_t namelen;      /* actual length of name (no NULL) */
  40                 __uint8_t valuelen;     /* actual length of value (no NULL) */
  41                 __uint8_t flags;        /* flags bits (see xfs_attr_leaf.h) */
  42                 __uint8_t nameval[1];   /* name & value bytes concatenated */
  43         } list[1];                      /* variable sized array */
  44 } xfs_attr_shortform_t;
  45 typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
  46 typedef struct xfs_attr_sf_entry xfs_attr_sf_entry_t;
  47
  48 /*
  49  * We generate this then sort it, attr_list() must return things in hash-order.
  50  */
  51 typedef struct xfs_attr_sf_sort {
  52         __uint8_t       entno;          /* entry number in original list */
  53         __uint8_t       namelen;        /* length of name value (no null) */
  54         __uint8_t       valuelen;       /* length of value */
  55         __uint8_t       flags;          /* flags bits (see xfs_attr_leaf.h) */
  56         xfs_dahash_t    hash;           /* this entry's hash value */
  57         char            *name;          /* name value, pointer into buffer */
  58 } xfs_attr_sf_sort_t;
  59
  60 #define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen)   /* space name/value uses */ \
  61         (((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen)))
  62 #define XFS_ATTR_SF_ENTSIZE_MAX                 /* max space for name&value */ \
  63         ((1 << (NBBY*(int)sizeof(__uint8_t))) - 1)
  64 #define XFS_ATTR_SF_ENTSIZE(sfep)               /* space an entry uses */ \
  65         ((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen)
  66 #define XFS_ATTR_SF_NEXTENTRY(sfep)             /* next entry in struct */ \
  67         ((xfs_attr_sf_entry_t *)((char *)(sfep) + XFS_ATTR_SF_ENTSIZE(sfep)))
  68 #define XFS_ATTR_SF_TOTSIZE(dp)                 /* total space in use */ \
  69         (be16_to_cpu(((xfs_attr_shortform_t *)  \
  70                 ((dp)->i_afp->if_u1.if_data))->hdr.totsize))
  71
  72 #if defined(XFS_ATTR_TRACE)
  73 /*
  74  * Kernel tracing support for attribute lists
  75  */
  76 struct xfs_attr_list_context;
  77 struct xfs_da_intnode;
  78 struct xfs_da_node_entry;
  79 struct xfs_attr_leafblock;
  80
  81 #define XFS_ATTR_TRACE_SIZE     4096    /* size of global trace buffer */
  82 extern ktrace_t *xfs_attr_trace_buf;
  83
  84 /*
  85  * Trace record types.
  86  */
  87 #define XFS_ATTR_KTRACE_L_C     1       /* context */
  88 #define XFS_ATTR_KTRACE_L_CN    2       /* context, node */
  89 #define XFS_ATTR_KTRACE_L_CB    3       /* context, btree */
  90 #define XFS_ATTR_KTRACE_L_CL    4       /* context, leaf */
  91
  92 void xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context);
  93 void xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
  94                               struct xfs_da_intnode *node);
  95 void xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
  96                               struct xfs_da_node_entry *btree);
  97 void xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
  98                               struct xfs_attr_leafblock *leaf);
  99 void xfs_attr_trace_enter(int type, char *where,
 100                              struct xfs_attr_list_context *context,
 101                              __psunsigned_t a13, __psunsigned_t a14,
 102                              __psunsigned_t a15);
 103 #else
 104 #define xfs_attr_trace_l_c(w,c)
 105 #define xfs_attr_trace_l_cn(w,c,n)
 106 #define xfs_attr_trace_l_cb(w,c,b)
 107 #define xfs_attr_trace_l_cl(w,c,l)
 108 #endif /* XFS_ATTR_TRACE */
 109
 110 #endif  /* __XFS_ATTR_SF_H__ */