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  * Revalidate the Linux inode from the XFS inode.
  87  * Note: i_size _not_ updated; we must hold the inode
  88  * semaphore when doing that - callers responsibility.
  89  */
  90 int
  91 vn_revalidate(
  92         bhv_vnode_t             *vp)
  93 {
  94         struct inode            *inode = vn_to_inode(vp);
  95         struct xfs_inode        *ip = XFS_I(inode);
  96         struct xfs_mount        *mp = ip->i_mount;
  97         unsigned long           xflags;
  98
  99         xfs_itrace_entry(ip);
 100
 101         if (XFS_FORCED_SHUTDOWN(mp))
 102                 return -EIO;
 103
 104         xfs_ilock(ip, XFS_ILOCK_SHARED);
 105         inode->i_mode       = ip->i_d.di_mode;
 106         inode->i_uid        = ip->i_d.di_uid;
 107         inode->i_gid        = ip->i_d.di_gid;
 108         inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
 109         inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
 110         inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
 111         inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
 112
 113         xflags = xfs_ip2xflags(ip);
 114         if (xflags & XFS_XFLAG_IMMUTABLE)
 115                 inode->i_flags |= S_IMMUTABLE;
 116         else
 117                 inode->i_flags &= ~S_IMMUTABLE;
 118         if (xflags & XFS_XFLAG_APPEND)
 119                 inode->i_flags |= S_APPEND;
 120         else
 121                 inode->i_flags &= ~S_APPEND;
 122         if (xflags & XFS_XFLAG_SYNC)
 123                 inode->i_flags |= S_SYNC;
 124         else
 125                 inode->i_flags &= ~S_SYNC;
 126         if (xflags & XFS_XFLAG_NOATIME)
 127                 inode->i_flags |= S_NOATIME;
 128         else
 129                 inode->i_flags &= ~S_NOATIME;
 130         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 131
 132         xfs_iflags_clear(ip, XFS_IMODIFIED);
 133         return 0;
 134 }
 135
 136 /*
 137  * Add a reference to a referenced vnode.
 138  */
 139 bhv_vnode_t *
 140 vn_hold(
 141         bhv_vnode_t     *vp)
 142 {
 143         struct inode    *inode;
 144
 145         XFS_STATS_INC(vn_hold);
 146
 147         inode = igrab(vn_to_inode(vp));
 148         ASSERT(inode);
 149
 150         return vp;
 151 }
 152
 153 #ifdef  XFS_INODE_TRACE
 154
 155 /*
 156  * Reference count of Linux inode if present, -1 if the xfs_inode
 157  * has no associated Linux inode.
 158  */
 159 static inline int xfs_icount(struct xfs_inode *ip)
 160 {
 161         bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
 162
 163         if (vp)
 164                 return vn_count(vp);
 165         return -1;
 166 }
 167
 168 #define KTRACE_ENTER(ip, vk, s, line, ra)                       \
 169         ktrace_enter(   (ip)->i_trace,                          \
 170 /*  0 */                (void *)(__psint_t)(vk),                \
 171 /*  1 */                (void *)(s),                            \
 172 /*  2 */                (void *)(__psint_t) line,               \
 173 /*  3 */                (void *)(__psint_t)xfs_icount(ip),      \
 174 /*  4 */                (void *)(ra),                           \
 175 /*  5 */                NULL,                                   \
 176 /*  6 */                (void *)(__psint_t)current_cpu(),       \
 177 /*  7 */                (void *)(__psint_t)current_pid(),       \
 178 /*  8 */                (void *)__return_address,               \
 179 /*  9 */                NULL, NULL, NULL, NULL, NULL, NULL, NULL)
 180
 181 /*
 182  * Vnode tracing code.
 183  */
 184 void
 185 _xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
 186 {
 187         KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
 188 }
 189
 190 void
 191 _xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
 192 {
 193         KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
 194 }
 195
 196 void
 197 xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 198 {
 199         KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
 200 }
 201
 202 void
 203 _xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 204 {
 205         KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
 206 }
 207
 208 void
 209 xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
 210 {
 211         KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
 212 }
 213 #endif  /* XFS_INODE_TRACE */