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Sprinkle locking.

This commit is contained in:
ad 2008-04-22 21:33:13 +00:00
parent dce30353aa
commit 624dcd9102
1 changed files with 21 additions and 11 deletions
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32
sys/compat/osf1/osf1_mount.c
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@ -1,4 +1,4 @@
/* $NetBSD: osf1_mount.c,v 1.40 2008/03/21 21:54:59 ad Exp $ */
/* $NetBSD: osf1_mount.c,v 1.41 2008/04/22 21:33:13 ad Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
@ -58,7 +58,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: osf1_mount.c,v 1.40 2008/03/21 21:54:59 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: osf1_mount.c,v 1.41 2008/04/22 21:33:13 ad Exp $");
#if defined(_KERNEL_OPT)
#include "fs_nfs.h"
@ -147,9 +147,13 @@ osf1_sys_getfsstat(struct lwp *l, const struct osf1_sys_getfsstat_args *uap, reg
maxcount = SCARG(uap, bufsize) / sizeof(struct osf1_statfs);
osf_sfsp = (void *)SCARG(uap, buf);
mutex_enter(&mountlist_lock);
for (count = 0, mp = mountlist.cqh_first; mp != (void *)&mountlist;
mp = nmp) {
nmp = mp->mnt_list.cqe_next;
if (vfs_trybusy(mp, RW_READER, &mountlist_lock)) {
nmp = mp->mnt_list.cqe_next;
continue;
}
if (osf_sfsp && count < maxcount) {
sp = &mp->mnt_stat;
/*
@ -159,17 +163,23 @@ osf1_sys_getfsstat(struct lwp *l, const struct osf1_sys_getfsstat_args *uap, reg
*/
if (((SCARG(uap, flags) & OSF1_MNT_NOWAIT) == 0 ||
(SCARG(uap, flags) & OSF1_MNT_WAIT)) &&
(error = VFS_STATVFS(mp, sp)))
continue;
sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
osf1_cvt_statfs_from_native(sp, &osfs);
if ((error = copyout(&osfs, osf_sfsp,
sizeof (struct osf1_statfs))))
return (error);
osf_sfsp += sizeof (struct osf1_statfs);
(error = VFS_STATVFS(mp, sp)) == 0) {
sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
osf1_cvt_statfs_from_native(sp, &osfs);
if ((error = copyout(&osfs, osf_sfsp,
sizeof (struct osf1_statfs)))) {
vfs_unbusy(mp, false);
return (error);
}
osf_sfsp += sizeof (struct osf1_statfs);
}
}
count++;
mutex_enter(&mountlist_lock);
nmp = mp->mnt_list.cqe_next;
vfs_unbusy(mp, false);
}
mutex_exit(&mountlist_lock);
if (osf_sfsp && count > maxcount)
*retval = maxcount;
else