Author: kib
Date: Tue Apr 16 17:56:53 2019
New Revision: 346289
URL: https://svnweb.freebsd.org/changeset/base/346289
Log:
MFC r346064:
Fix dirty buf exhaustion easily triggered with msdosfs.
Modified:
stable/11/sys/fs/msdosfs/msdosfs_fat.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/fs/msdosfs/msdosfs_fat.c
==============================================================================
--- stable/11/sys/fs/msdosfs/msdosfs_fat.c Tue Apr 16 17:55:54 2019
(r346288)
+++ stable/11/sys/fs/msdosfs/msdosfs_fat.c Tue Apr 16 17:56:53 2019
(r346289)
@@ -52,6 +52,7 @@
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/mount.h>
+#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <fs/msdosfs/bpb.h>
@@ -977,6 +978,7 @@ extendfile(struct denode *dep, u_long count, struct bu
u_long cn, got;
struct msdosfsmount *pmp = dep->de_pmp;
struct buf *bp;
+ struct vop_fsync_args fsync_ap;
daddr_t blkno;
/*
@@ -1086,8 +1088,16 @@ extendfile(struct denode *dep, u_long count, struct bu
if (bpp) {
*bpp = bp;
bpp = NULL;
- } else
+ } else {
bdwrite(bp);
+ }
+ if (vm_page_count_severe() ||
+ buf_dirty_count_severe()) {
+ fsync_ap.a_vp = DETOV(dep);
+ fsync_ap.a_waitfor = MNT_WAIT;
+ fsync_ap.a_td = curthread;
+ vop_stdfsync(&fsync_ap);
+ }
}
}
}
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