diff options
| author |   anton <anton@openbsd.org> | 2019-08-05 08:35:59 +0000 |
|---|---|---|
| committer | anton <anton@openbsd.org> | 2019-08-05 08:35:59 +0000 |
| commit | 836f297b392ea9a1d38b1ff0cf70716087e44f8a (patch) | |
| tree | 83dd65931d92ba9dd808f5209c217e697912c701 /sys/msdosfs | |
| parent | sis(4) calls mii_phy_reset(); add explicit dependency on mii_phy in config (diff) | |
| download | wireguard-openbsd-836f297b392ea9a1d38b1ff0cf70716087e44f8a.tar.xz wireguard-openbsd-836f297b392ea9a1d38b1ff0cf70716087e44f8a.zip | |
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/msdosfs')
| -rw-r--r-- | sys/msdosfs/msdosfs_vnops.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/msdosfs/msdosfs_vnops.c b/sys/msdosfs/msdosfs_vnops.c index 9da3f95f632..f5e2cfd3784 100644 --- a/sys/msdosfs/msdosfs_vnops.c +++ b/sys/msdosfs/msdosfs_vnops.c @@ -1,4 +1,4 @@ -/* $OpenBSD: msdosfs_vnops.c,v 1.125 2019/07/19 00:24:31 cheloha Exp $ */ +/* $OpenBSD: msdosfs_vnops.c,v 1.126 2019/08/05 08:35:59 anton Exp $ */ /* $NetBSD: msdosfs_vnops.c,v 1.63 1997/10/17 11:24:19 ws Exp $ */ /*- @@ -2017,7 +2017,7 @@ filt_msdosfsread(struct knote *kn, long hint) return (1); } - kn->kn_data = dep->de_FileSize - kn->kn_fp->f_offset; + kn->kn_data = dep->de_FileSize - foffset(kn->kn_fp); if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) { kn->kn_fflags |= NOTE_EOF; return (1); |