nfsd4: warn on open failure after create

If we create the object and then return failure to the client, we're
left with an unexpected file in the filesystem.

I'm trying to eliminate such cases but not 100% sure I have so an
assertion might be helpful for now.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

4 files changed, 8 insertions, 6 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 10b50d78bdc3..710b97b7a2f3 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -194,7 +194,6 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
 {
         struct svc_fh resfh;
         __be32 status;
-        int created = 0;
 
         fh_init(&resfh, NFS4_FHSIZE);
         open->op_truncate = 0;
@@ -223,7 +222,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
                                         open->op_fname.len, &open->op_iattr,
                                         &resfh, open->op_createmode,
                                         (u32 *)open->op_verf.data,
-                                        &open->op_truncate, &created);
+                                        &open->op_truncate, &open->op_created);
 
                 /*
                  * Following rfc 3530 14.2.16, use the returned bitmask
@@ -253,7 +252,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o
         /* set reply cache */
         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
                         &resfh.fh_handle);
-        if (!created)
+        if (!open->op_created)
                 status = do_open_permission(rqstp, current_fh, open,
                                             NFSD_MAY_NOP);
 
@@ -318,6 +317,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         /* We don't yet support WANT bits: */
         open->op_share_access &= NFS4_SHARE_ACCESS_MASK;
 
+        open->op_created = 0;
         /*
          * RFC5661 18.51.3
          * Before RECLAIM_COMPLETE done, server should deny new lock
@@ -408,6 +408,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
          */
         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
+        WARN_ON(status && open->op_created);
 out:
         nfsd4_cleanup_open_state(open, status);
         if (open->op_openowner)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4dd91283d039..7a2e442623c8 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1370,7 +1370,7 @@ __be32
 do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
                 char *fname, int flen, struct iattr *iap,
                 struct svc_fh *resfhp, int createmode, u32 *verifier,
-                int *truncp, int *created)
+                bool *truncp, bool *created)
 {
         struct dentry   *dentry, *dchild = NULL;
         struct inode    *dirp;
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index 503f3bf11abd..3f54ad03bb2b 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -62,7 +62,7 @@ __be32		nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
 __be32          do_nfsd_create(struct svc_rqst *, struct svc_fh *,
                                 char *name, int len, struct iattr *attrs,
                                 struct svc_fh *res, int createmode,
-                                u32 *verifier, int *truncp, int *created);
+                                u32 *verifier, bool *truncp, bool *created);
 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
                                 loff_t, unsigned long);
 #endif /* CONFIG_NFSD_V3 */
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index ce8c59196b4e..e3057350eea1 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -226,7 +226,8 @@ struct nfsd4_open {
         u32             op_recall;          /* recall */
         struct nfsd4_change_info  op_cinfo; /* response */
         u32             op_rflags;          /* response */
-        int             op_truncate;        /* used during processing */
+        bool            op_truncate;        /* used during processing */
+        bool            op_created;         /* used during processing */
         struct nfs4_openowner *op_openowner; /* used during processing */
         struct nfs4_file *op_file;          /* used during processing */
         struct nfs4_ol_stateid *op_stp;     /* used during processing */