diff options
| author | anton <anton@cvs.openbsd.org> | 2019-08-05 08:36:00 +0000 |
|---|---|---|
| committer | anton <anton@cvs.openbsd.org> | 2019-08-05 08:36:00 +0000 |
| commit | 2de89e15b7def75453779ec4caaa525c42d8f6d5 (patch) | |
| tree | 51666813036b139145bd44ffc7e017740fd196ae /sys/nfs | |
| parent | 2e6a89f0541effeff8b1f6b09613577db20cbc5d (diff) | |
Allow concurrent reads of the f_offset field of struct file by
serializing both read/write operations using the existing file mutex.
The vnode lock still grants exclusive write access to the offset; the
mutex is only used to make the actual write atomic and prevent any
concurrent reader from observing intermediate values.
ok mpi@ visa@
Diffstat (limited to 'sys/nfs')
| -rw-r--r-- | sys/nfs/nfs_kq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/nfs/nfs_kq.c b/sys/nfs/nfs_kq.c index a73847a9a2e..990f66651c0 100644 --- a/sys/nfs/nfs_kq.c +++ b/sys/nfs/nfs_kq.c @@ -1,4 +1,4 @@ -/* $OpenBSD: nfs_kq.c,v 1.24 2019/07/12 13:56:27 solene Exp $ */ +/* $OpenBSD: nfs_kq.c,v 1.25 2019/08/05 08:35:59 anton Exp $ */ /* $NetBSD: nfs_kq.c,v 1.7 2003/10/30 01:43:10 simonb Exp $ */ /*- @@ -226,7 +226,7 @@ filt_nfsread(struct knote *kn, long hint) return (1); } - kn->kn_data = np->n_size - kn->kn_fp->f_offset; + kn->kn_data = np->n_size - foffset(kn->kn_fp); #ifdef DEBUG printf("nfsread event. %lld\n", kn->kn_data); #endif |