Date: Wed, 3 Apr 2013 15:38:44 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r249054 - stable/9/sys/kern Message-ID: <201304031538.r33FciW4078904@svn.freebsd.org>
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Author: kib Date: Wed Apr 3 15:38:44 2013 New Revision: 249054 URL: http://svnweb.freebsd.org/changeset/base/249054 Log: MFC r248563: Increment the write ref counter for the buffer object before calling bundirty(). Modified: stable/9/sys/kern/vfs_bio.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/kern/vfs_bio.c ============================================================================== --- stable/9/sys/kern/vfs_bio.c Wed Apr 3 15:34:25 2013 (r249053) +++ stable/9/sys/kern/vfs_bio.c Wed Apr 3 15:38:44 2013 (r249054) @@ -936,7 +936,13 @@ bufwrite(struct buf *bp) else vp_md = 0; - /* Mark the buffer clean */ + /* + * Mark the buffer clean. Increment the bufobj write count + * before bundirty() call, to prevent other thread from seeing + * empty dirty list and zero counter for writes in progress, + * falsely indicating that the bufobj is clean. + */ + bufobj_wref(bp->b_bufobj); bundirty(bp); bp->b_flags &= ~B_DONE; @@ -944,7 +950,6 @@ bufwrite(struct buf *bp) bp->b_flags |= B_CACHE; bp->b_iocmd = BIO_WRITE; - bufobj_wref(bp->b_bufobj); vfs_busy_pages(bp, 1); /*
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