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/* Process st_?tim updates marked for a diskfs node.
Copyright (C) 1994, 1996, 1999, 2000, 2007, 2009 Free Software Foundation,
Inc.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include <maptime.h>
/* If the disk is not readonly and noatime is not set, then check relatime
conditions: if either `np->dn_stat.st_mtim.tv_sec' or
`np->dn_stat.st_ctim.tv_sec' is greater than `np->dn_stat.st_atim.tv_sec',
or if the atime is greater than 24 hours old, return true.
*/
int
atime_should_update (struct node *np)
{
struct timeval t;
if (_diskfs_noatime)
return 0;
if (_diskfs_relatime)
{
/* Update atime if mtime is younger than atime. */
if (np->dn_stat.st_mtim.tv_sec > np->dn_stat.st_atim.tv_sec)
return 1;
/* Update atime if ctime is younger than atime. */
if (np->dn_stat.st_ctim.tv_sec > np->dn_stat.st_atim.tv_sec)
return 1;
/* Update atime if current atime is more than 24 hours old. */
maptime_read (diskfs_mtime, &t);
if ((long)(t.tv_sec - np->dn_stat.st_atim.tv_sec) >= 24 * 60 * 60)
return 1;
return 0;
}
return 1; /* strictatime */
}
/* If disk is not readonly and the noatime option is not enabled, set
NP->dn_set_atime. If relatime is enabled, only set NP->dn_set_atime
if the atime has not been updated today, or if ctime or mtime are
more recent than atime */
void
diskfs_set_node_atime (struct node *np)
{
if (!diskfs_check_readonly () && atime_should_update (np))
np->dn_set_atime = 1;
}
/* If NP->dn_set_ctime is set, then modify NP->dn_stat.st_ctim
appropriately; do the analogous operation for atime and mtime as well. */
void
diskfs_set_node_times (struct node *np)
{
struct timeval t;
if (!np->dn_set_mtime && !np->dn_set_atime && !np->dn_set_ctime)
return;
maptime_read (diskfs_mtime, &t);
/* We are careful to test and reset each of these individually, so there
is no race condition where a dn_set_?time flag setting gets lost. It
is not a problem to have the kind of race where the flag is set after
we've tested it and done nothing--as long as the flag remains set so
the update will happen at the next call. */
if (np->dn_set_mtime)
{
np->dn_stat.st_mtim.tv_sec = t.tv_sec;
np->dn_stat.st_mtim.tv_nsec = t.tv_usec * 1000;
np->dn_stat_dirty = 1;
np->dn_set_mtime = 0;
}
if (np->dn_set_atime)
{
np->dn_stat.st_atim.tv_sec = t.tv_sec;
np->dn_stat.st_atim.tv_nsec = t.tv_usec * 1000;
np->dn_stat_dirty = 1;
np->dn_set_atime = 0;
}
if (np->dn_set_ctime)
{
np->dn_stat.st_ctim.tv_sec = t.tv_sec;
np->dn_stat.st_ctim.tv_nsec = t.tv_usec * 1000;
np->dn_stat_dirty = 1;
np->dn_set_ctime = 0;
}
}
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