From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
The nfsd_open code handles EOPENSTALE correctly, by retrying the call to
fh_verify() and __nfsd_open(). However the filecache just drops the
error on the floor, and immediately returns nfserr_stale to the caller.
This patch ensures that we propagate the EOPENSTALE code back to
nfsd_file_do_acquire, and that we handle it correctly.
Fixes: 65294c1f2c5e ("nfsd: add a new struct file caching facility to nfsd")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfsd/filecache.c | 27 +++++++++++++++++++--------
fs/nfsd/vfs.c | 28 +++++++++++++---------------
fs/nfsd/vfs.h | 2 +-
3 files changed, 33 insertions(+), 24 deletions(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index ee9c923192e0..07bf219f9ae4 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -989,22 +989,21 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
struct net *net = SVC_NET(rqstp);
struct nfsd_file *new, *nf;
- const struct cred *cred;
+ bool stale_retry = true;
bool open_retry = true;
struct inode *inode;
__be32 status;
int ret;
+retry:
status = fh_verify(rqstp, fhp, S_IFREG,
may_flags|NFSD_MAY_OWNER_OVERRIDE);
if (status != nfs_ok)
return status;
inode = d_inode(fhp->fh_dentry);
- cred = get_current_cred();
-retry:
rcu_read_lock();
- nf = nfsd_file_lookup_locked(net, cred, inode, need, want_gc);
+ nf = nfsd_file_lookup_locked(net, current_cred(), inode, need, want_gc);
rcu_read_unlock();
if (nf) {
@@ -1026,7 +1025,7 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
rcu_read_lock();
spin_lock(&inode->i_lock);
- nf = nfsd_file_lookup_locked(net, cred, inode, need, want_gc);
+ nf = nfsd_file_lookup_locked(net, current_cred(), inode, need, want_gc);
if (unlikely(nf)) {
spin_unlock(&inode->i_lock);
rcu_read_unlock();
@@ -1058,6 +1057,7 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
goto construction_err;
}
open_retry = false;
+ fh_put(fhp);
goto retry;
}
this_cpu_inc(nfsd_file_cache_hits);
@@ -1074,7 +1074,6 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
nfsd_file_check_write_error(nf);
*pnf = nf;
}
- put_cred(cred);
trace_nfsd_file_acquire(rqstp, inode, may_flags, nf, status);
return status;
@@ -1088,8 +1087,20 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
status = nfs_ok;
trace_nfsd_file_opened(nf, status);
} else {
- status = nfsd_open_verified(rqstp, fhp, may_flags,
- &nf->nf_file);
+ ret = nfsd_open_verified(rqstp, fhp, may_flags,
+ &nf->nf_file);
+ if (ret == -EOPENSTALE && stale_retry) {
+ stale_retry = false;
+ nfsd_file_unhash(nf);
+ clear_and_wake_up_bit(NFSD_FILE_PENDING,
+ &nf->nf_flags);
+ if (refcount_dec_and_test(&nf->nf_ref))
+ nfsd_file_free(nf);
+ nf = NULL;
+ fh_put(fhp);
+ goto retry;
+ }
+ status = nfserrno(ret);
trace_nfsd_file_open(nf, status);
}
} else
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 2c9074ab2315..98fa4fd0556d 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -823,7 +823,7 @@ int nfsd_open_break_lease(struct inode *inode, int access)
* and additional flags.
* N.B. After this call fhp needs an fh_put
*/
-static __be32
+static int
__nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
int may_flags, struct file **filp)
{
@@ -831,14 +831,12 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
struct inode *inode;
struct file *file;
int flags = O_RDONLY|O_LARGEFILE;
- __be32 err;
- int host_err = 0;
+ int host_err = -EPERM;
path.mnt = fhp->fh_export->ex_path.mnt;
path.dentry = fhp->fh_dentry;
inode = d_inode(path.dentry);
- err = nfserr_perm;
if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE))
goto out;
@@ -847,7 +845,7 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
host_err = nfsd_open_break_lease(inode, may_flags);
if (host_err) /* NOMEM or WOULDBLOCK */
- goto out_nfserr;
+ goto out;
if (may_flags & NFSD_MAY_WRITE) {
if (may_flags & NFSD_MAY_READ)
@@ -859,13 +857,13 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
file = dentry_open(&path, flags, current_cred());
if (IS_ERR(file)) {
host_err = PTR_ERR(file);
- goto out_nfserr;
+ goto out;
}
host_err = ima_file_check(file, may_flags);
if (host_err) {
fput(file);
- goto out_nfserr;
+ goto out;
}
if (may_flags & NFSD_MAY_64BIT_COOKIE)
@@ -874,10 +872,8 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
file->f_mode |= FMODE_32BITHASH;
*filp = file;
-out_nfserr:
- err = nfserrno(host_err);
out:
- return err;
+ return host_err;
}
__be32
@@ -885,6 +881,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
int may_flags, struct file **filp)
{
__be32 err;
+ int host_err;
bool retried = false;
validate_process_creds();
@@ -904,12 +901,13 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
retry:
err = fh_verify(rqstp, fhp, type, may_flags);
if (!err) {
- err = __nfsd_open(rqstp, fhp, type, may_flags, filp);
- if (err == nfserr_stale && !retried) {
+ host_err = __nfsd_open(rqstp, fhp, type, may_flags, filp);
+ if (host_err == -EOPENSTALE && !retried) {
retried = true;
fh_put(fhp);
goto retry;
}
+ err = nfserrno(host_err);
}
validate_process_creds();
return err;
@@ -922,13 +920,13 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
* @may_flags: internal permission flags
* @filp: OUT: open "struct file *"
*
- * Returns an nfsstat value in network byte order.
+ * Returns a posix error.
*/
-__be32
+int
nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, int may_flags,
struct file **filp)
{
- __be32 err;
+ int err;
validate_process_creds();
err = __nfsd_open(rqstp, fhp, S_IFREG, may_flags, filp);
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index a6890ea7b765..e4b7207ef2e0 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -104,7 +104,7 @@ __be32 nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
int nfsd_open_break_lease(struct inode *, int);
__be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
int, struct file **);
-__be32 nfsd_open_verified(struct svc_rqst *, struct svc_fh *,
+int nfsd_open_verified(struct svc_rqst *, struct svc_fh *,
int, struct file **);
__be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct file *file, loff_t offset,
--
2.41.0
