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NFSD: Make nfsd4_remove() wait before returning NFS4ERR_DELAY

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nfsd_unlink() can kick off a CB_RECALL (via
vfs_unlink() -> leases_conflict()) if a delegation is present.
Before returning NFS4ERR_DELAY, give the client holding that
delegation a chance to return it and then retry the nfsd_unlink()
again, once.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Chuck Lever 2022-09-08 18:14:25 -04:00
parent 68c522afd0
commit 5f5f8b6d65
1 changed files with 10 additions and 1 deletions
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11
fs/nfsd/vfs.c
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@ -1788,9 +1788,18 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
fh_fill_pre_attrs(fhp);
if (type != S_IFDIR) {
int retries;
if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK)
nfsd_close_cached_files(rdentry);
host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL);
for (retries = 1;;) {
host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL);
if (host_err != -EAGAIN || !retries--)
break;
if (!nfsd_wait_for_delegreturn(rqstp, rinode))
break;
}
} else {
host_err = vfs_rmdir(&init_user_ns, dirp, rdentry);
}