fs/xfs/linux-2.6/xfs_vnode.h

   1 /*
   2  * Copyright (c) 2000-2005 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_VNODE_H__
  19 #define __XFS_VNODE_H__
  20
  21 struct file;
  22 struct xfs_iomap;
  23 struct attrlist_cursor_kern;
  24
  25 typedef struct inode    bhv_vnode_t;
  26
  27 /*
  28  * Vnode to Linux inode mapping.
  29  */
  30 static inline bhv_vnode_t *vn_from_inode(struct inode *inode)
  31 {
  32         return inode;
  33 }
  34 static inline struct inode *vn_to_inode(bhv_vnode_t *vnode)
  35 {
  36         return vnode;
  37 }
  38
  39 /*
  40  * Return values for xfs_inactive.  A return value of
  41  * VN_INACTIVE_NOCACHE implies that the file system behavior
  42  * has disassociated its state and bhv_desc_t from the vnode.
  43  */
  44 #define VN_INACTIVE_CACHE       0
  45 #define VN_INACTIVE_NOCACHE     1
  46
  47 /*
  48  * Flags for read/write calls - same values as IRIX
  49  */
  50 #define IO_ISAIO        0x00001         /* don't wait for completion */
  51 #define IO_ISDIRECT     0x00004         /* bypass page cache */
  52 #define IO_INVIS        0x00020         /* don't update inode timestamps */
  53
  54 /*
  55  * Flags for xfs_inode_flush
  56  */
  57 #define FLUSH_SYNC              1       /* wait for flush to complete   */
  58
  59 /*
  60  * Flush/Invalidate options for vop_toss/flush/flushinval_pages.
  61  */
  62 #define FI_NONE                 0       /* none */
  63 #define FI_REMAPF               1       /* Do a remapf prior to the operation */
  64 #define FI_REMAPF_LOCKED        2       /* Do a remapf prior to the operation.
  65                                            Prevent VM access to the pages until
  66                                            the operation completes. */
  67
  68
  69 extern void     vn_init(void);
  70
  71 /*
  72  * Yeah, these don't take vnode anymore at all, all this should be
  73  * cleaned up at some point.
  74  */
  75 extern void     vn_iowait(struct xfs_inode *ip);
  76 extern void     vn_iowake(struct xfs_inode *ip);
  77 extern void     vn_ioerror(struct xfs_inode *ip, int error, char *f, int l);
  78
  79 static inline int vn_count(bhv_vnode_t *vp)
  80 {
  81         return atomic_read(&vn_to_inode(vp)->i_count);
  82 }
  83
  84 /*
  85  * Vnode reference counting functions (and macros for compatibility).
  86  */
  87 extern bhv_vnode_t      *vn_hold(bhv_vnode_t *);
  88
  89 #if defined(XFS_INODE_TRACE)
  90 #define VN_HOLD(vp)             \
  91         ((void)vn_hold(vp),     \
  92           xfs_itrace_hold(xfs_vtoi(vp), __FILE__, __LINE__, (inst_t *)__return_address))
  93 #define VN_RELE(vp)             \
  94           (xfs_itrace_rele(xfs_vtoi(vp), __FILE__, __LINE__, (inst_t *)__return_address), \
  95            iput(vn_to_inode(vp)))
  96 #else
  97 #define VN_HOLD(vp)             ((void)vn_hold(vp))
  98 #define VN_RELE(vp)             (iput(vn_to_inode(vp)))
  99 #endif
 100
 101 static inline bhv_vnode_t *vn_grab(bhv_vnode_t *vp)
 102 {
 103         struct inode *inode = igrab(vn_to_inode(vp));
 104         return inode ? vn_from_inode(inode) : NULL;
 105 }
 106
 107 /*
 108  * Dealing with bad inodes
 109  */
 110 static inline int VN_BAD(bhv_vnode_t *vp)
 111 {
 112         return is_bad_inode(vn_to_inode(vp));
 113 }
 114
 115 /*
 116  * Extracting atime values in various formats
 117  */
 118 static inline void vn_atime_to_bstime(bhv_vnode_t *vp, xfs_bstime_t *bs_atime)
 119 {
 120         bs_atime->tv_sec = vp->i_atime.tv_sec;
 121         bs_atime->tv_nsec = vp->i_atime.tv_nsec;
 122 }
 123
 124 static inline void vn_atime_to_timespec(bhv_vnode_t *vp, struct timespec *ts)
 125 {
 126         *ts = vp->i_atime;
 127 }
 128
 129 static inline void vn_atime_to_time_t(bhv_vnode_t *vp, time_t *tt)
 130 {
 131         *tt = vp->i_atime.tv_sec;
 132 }
 133
 134 /*
 135  * Some useful predicates.
 136  */
 137 #define VN_MAPPED(vp)   mapping_mapped(vn_to_inode(vp)->i_mapping)
 138 #define VN_CACHED(vp)   (vn_to_inode(vp)->i_mapping->nrpages)
 139 #define VN_DIRTY(vp)    mapping_tagged(vn_to_inode(vp)->i_mapping, \
 140                                         PAGECACHE_TAG_DIRTY)
 141
 142
 143 /*
 144  * Tracking vnode activity.
 145  */
 146 #if defined(XFS_INODE_TRACE)
 147
 148 #define INODE_TRACE_SIZE        16              /* number of trace entries */
 149 #define INODE_KTRACE_ENTRY      1
 150 #define INODE_KTRACE_EXIT       2
 151 #define INODE_KTRACE_HOLD       3
 152 #define INODE_KTRACE_REF        4
 153 #define INODE_KTRACE_RELE       5
 154
 155 extern void _xfs_itrace_entry(struct xfs_inode *, const char *, inst_t *);
 156 extern void _xfs_itrace_exit(struct xfs_inode *, const char *, inst_t *);
 157 extern void xfs_itrace_hold(struct xfs_inode *, char *, int, inst_t *);
 158 extern void _xfs_itrace_ref(struct xfs_inode *, char *, int, inst_t *);
 159 extern void xfs_itrace_rele(struct xfs_inode *, char *, int, inst_t *);
 160 #define xfs_itrace_entry(ip)    \
 161         _xfs_itrace_entry(ip, __func__, (inst_t *)__return_address)
 162 #define xfs_itrace_exit(ip)     \
 163         _xfs_itrace_exit(ip, __func__, (inst_t *)__return_address)
 164 #define xfs_itrace_exit_tag(ip, tag)    \
 165         _xfs_itrace_exit(ip, tag, (inst_t *)__return_address)
 166 #define xfs_itrace_ref(ip)      \
 167         _xfs_itrace_ref(ip, __FILE__, __LINE__, (inst_t *)__return_address)
 168
 169 #else
 170 #define xfs_itrace_entry(a)
 171 #define xfs_itrace_exit(a)
 172 #define xfs_itrace_exit_tag(a, b)
 173 #define xfs_itrace_hold(a, b, c, d)
 174 #define xfs_itrace_ref(a)
 175 #define xfs_itrace_rele(a, b, c, d)
 176 #endif
 177
 178 #endif  /* __XFS_VNODE_H__ */