Date: Mon, 31 Aug 2009 20:59:23 +0000 (UTC) From: Kip Macy <kmacy@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r196713 - user/kmacy/head_zfs_merge/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <200908312059.n7VKxNMt038800@svn.freebsd.org>
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Author: kmacy Date: Mon Aug 31 20:59:23 2009 New Revision: 196713 URL: http://svn.freebsd.org/changeset/base/196713 Log: don't block waiting on a zfetch Modified: user/kmacy/head_zfs_merge/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c Modified: user/kmacy/head_zfs_merge/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c ============================================================================== --- user/kmacy/head_zfs_merge/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c Mon Aug 31 20:53:01 2009 (r196712) +++ user/kmacy/head_zfs_merge/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c Mon Aug 31 20:59:23 2009 (r196713) @@ -304,7 +304,9 @@ dmu_zfetch_find(zfetch_t *zf, zstream_t * modified in a number of different ways. */ - rw_enter(&zf->zf_rwlock, RW_READER); + if (rw_tryenter(&zf->zf_rwlock, RW_READER) == 0) + return (1); + top: for (zs = list_head(&zf->zf_stream); zs;
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