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 wait queues.
  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 #ifdef  XFS_INODE_TRACE
  86
  87 #define KTRACE_ENTER(ip, vk, s, line, ra)                       \
  88         ktrace_enter(   (ip)->i_trace,                          \
  89 /*  0 */                (void *)(__psint_t)(vk),                \
  90 /*  1 */                (void *)(s),                            \
  91 /*  2 */                (void *)(__psint_t) line,               \
  92 /*  3 */                (void *)(__psint_t)atomic_read(&VFS_I(ip)->i_count), \
  93 /*  4 */                (void *)(ra),                           \
  94 /*  5 */                NULL,                                   \
  95 /*  6 */                (void *)(__psint_t)current_cpu(),       \
  96 /*  7 */                (void *)(__psint_t)current_pid(),       \
  97 /*  8 */                (void *)__return_address,               \
  98 /*  9 */                NULL, NULL, NULL, NULL, NULL, NULL, NULL)
  99
 100 /*
 101  * Vnode tracing code.
 102  */
 103 void
 104 _xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
 105 {
 106         KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
 107 }
 108
 109 void
 110 _xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
 111 {
 112         KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
 113 }
 114
 115 void
 116 xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 117 {
 118         KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
 119 }
 120
 121 void
 122 _xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 123 {
 124         KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
 125 }
 126
 127 void
 128 xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 129 {
 130         KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
 131 }
 132 #endif  /* XFS_INODE_TRACE */