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Since NFSv4 is not SMP safe, nfsiod needs to acquire Giant for NFSv4 mounts

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before doing the read/write.

Reported by:	Chuck Lever.
This commit is contained in:
Mohan Srinivasan 2006-05-24 23:06:50 +00:00
parent 75b773ae3d
commit 5bbfbd1422
2 changed files with 9 additions and 0 deletions
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1
sys/nfsclient/nfs.h
View file

@ -86,6 +86,7 @@
#define NFS_CMPFH(n, f, s) \
((n)->n_fhsize == (s) && !bcmp((caddr_t)(n)->n_fhp, (caddr_t)(f), (s)))
#define NFS_ISV3(v) (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
#define NFS_ISV4(v) (VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV4)
#define NFSSTA_HASWRITEVERF 0x00040000 /* Has write verifier for V3 */
#define NFSSTA_GOTFSINFO 0x00100000 /* Got the V3 fsinfo */

8
sys/nfsclient/nfs_nfsiod.c
View file

@ -248,6 +248,8 @@ nfssvc_iod(void *instance)
if (error)
break;
while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) {
int giant_locked = 0;
/* Take one off the front of the list */
TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist);
nmp->nm_bufqlen--;
@ -256,6 +258,10 @@ nfssvc_iod(void *instance)
wakeup(&nmp->nm_bufq);
}
mtx_unlock(&nfs_iod_mtx);
if (NFS_ISV4(bp->b_vp)) {
giant_locked = 1;
mtx_lock(&Giant);
}
if (bp->b_flags & B_DIRECT) {
KASSERT((bp->b_iocmd == BIO_WRITE), ("nfscvs_iod: BIO_WRITE not set"));
(void)nfs_doio_directwrite(bp);
@ -265,6 +271,8 @@ nfssvc_iod(void *instance)
else
(void) nfs_doio(bp->b_vp, bp, bp->b_wcred, NULL);
}
if (giant_locked)
mtx_unlock(&Giant);
mtx_lock(&nfs_iod_mtx);
/*
* If there are more than one iod on this mount, then defect