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Disable nullfs cacheing on top of fusefs

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Nullfs cacheing can keep a large number of vnodes active.  That results in
more active FUSE file handles, causing some FUSE servers to use extra
resources.  Disable nullfs cacheing for fusefs, just like we already do for
NFSv4.

PR:		245688
Reported by:	MooseFS FreeBSD Team <freebsd@moosefs.pro>
MFC after:	2 weeks
This commit is contained in:
asomers 2020-05-22 18:03:14 +00:00
parent adb1653076
commit b0a72bc08d
1 changed files with 5 additions and 0 deletions
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5
sys/fs/fuse/fuse_vfsops.c
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@ -425,6 +425,11 @@ fuse_vfsop_mount(struct mount *mp)
*/
mp->mnt_flag &= ~MNT_LOCAL;
mp->mnt_kern_flag |= MNTK_USES_BCACHE;
/*
* Disable nullfs cacheing because it can consume too many resources in
* the FUSE server.
*/
mp->mnt_kern_flag |= MNTK_NULL_NOCACHE;
MNT_IUNLOCK(mp);
/* We need this here as this slot is used by getnewvnode() */
mp->mnt_stat.f_iosize = maxbcachebuf;