fs/xfs/linux-2.6/xfs_vnode.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 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 #include "xfs.h"
  19 #include "xfs_vnodeops.h"
  20 #include "xfs_bmap_btree.h"
  21 #include "xfs_inode.h"
  22
  23 /*
  24  * And this gunk is needed for xfs_mount.h"
  25  */
  26 #include "xfs_log.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_sb.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_inum.h"
  31 #include "xfs_ag.h"
  32 #include "xfs_mount.h"
  33
  34
  35 /*
  36  * Dedicated vnode inactive/reclaim sync semaphores.
  37  * Prime number of hash buckets since address is used as the key.
  38  */
  39 #define NVSYNC                  37
  40 #define vptosync(v)             (&vsync[((unsigned long)v) % NVSYNC])
  41 static wait_queue_head_t vsync[NVSYNC];
  42
  43 void __init
  44 vn_init(void)
  45 {
  46         int i;
  47
  48         for (i = 0; i < NVSYNC; i++)
  49                 init_waitqueue_head(&vsync[i]);
  50 }
  51
  52 void
  53 vn_iowait(
  54         xfs_inode_t     *ip)
  55 {
  56         wait_queue_head_t *wq = vptosync(ip);
  57
  58         wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
  59 }
  60
  61 void
  62 vn_iowake(
  63         xfs_inode_t     *ip)
  64 {
  65         if (atomic_dec_and_test(&ip->i_iocount))
  66                 wake_up(vptosync(ip));
  67 }
  68
  69 /*
  70  * Volume managers supporting multiple paths can send back ENODEV when the
  71  * final path disappears.  In this case continuing to fill the page cache
  72  * with dirty data which cannot be written out is evil, so prevent that.
  73  */
  74 void
  75 vn_ioerror(
  76         xfs_inode_t     *ip,
  77         int             error,
  78         char            *f,
  79         int             l)
  80 {
  81         if (unlikely(error == -ENODEV))
  82                 xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
  83 }
  84
  85
  86 /*
  87  * Add a reference to a referenced vnode.
  88  */
  89 bhv_vnode_t *
  90 vn_hold(
  91         bhv_vnode_t     *vp)
  92 {
  93         struct inode    *inode;
  94
  95         XFS_STATS_INC(vn_hold);
  96
  97         inode = igrab(vn_to_inode(vp));
  98         ASSERT(inode);
  99
 100         return vp;
 101 }
 102
 103 #ifdef  XFS_INODE_TRACE
 104
 105 /*
 106  * Reference count of Linux inode if present, -1 if the xfs_inode
 107  * has no associated Linux inode.
 108  */
 109 static inline int xfs_icount(struct xfs_inode *ip)
 110 {
 111         bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
 112
 113         if (vp)
 114                 return vn_count(vp);
 115         return -1;
 116 }
 117
 118 #define KTRACE_ENTER(ip, vk, s, line, ra)                       \
 119         ktrace_enter(   (ip)->i_trace,                          \
 120 /*  0 */                (void *)(__psint_t)(vk),                \
 121 /*  1 */                (void *)(s),                            \
 122 /*  2 */                (void *)(__psint_t) line,               \
 123 /*  3 */                (void *)(__psint_t)xfs_icount(ip),      \
 124 /*  4 */                (void *)(ra),                           \
 125 /*  5 */                NULL,                                   \
 126 /*  6 */                (void *)(__psint_t)current_cpu(),       \
 127 /*  7 */                (void *)(__psint_t)current_pid(),       \
 128 /*  8 */                (void *)__return_address,               \
 129 /*  9 */                NULL, NULL, NULL, NULL, NULL, NULL, NULL)
 130
 131 /*
 132  * Vnode tracing code.
 133  */
 134 void
 135 _xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
 136 {
 137         KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
 138 }
 139
 140 void
 141 _xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
 142 {
 143         KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
 144 }
 145
 146 void
 147 xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 148 {
 149         KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
 150 }
 151
 152 void
 153 _xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 154 {
 155         KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
 156 }
 157
 158 void
 159 xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 160 {
 161         KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
 162 }
 163 #endif  /* XFS_INODE_TRACE */