nfs: clean up ->create in nfs_rpc_ops

Don't pass nfs_open_context() to ->create().  Only the NFS4 implementation
needed that and only because it wanted to return an open file using open
intents.  That task has been replaced by ->atomic_open so it is not necessary
anymore to pass the context to the create rpc operation.

Despite nfs4_proc_create apparently being okay with a NULL context it Oopses
somewhere down the call chain.  So allocate a context here.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 0d8c712..45015d3 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -114,10 +114,8 @@ const struct inode_operations nfs3_dir_inode_operations = {
 static struct file *nfs_atomic_open(struct inode *, struct dentry *,
                                    struct opendata *, unsigned, umode_t,
                                    bool *);
-static int nfs4_create(struct inode *dir, struct dentry *dentry,
-                      umode_t mode, struct nameidata *nd);
 const struct inode_operations nfs4_dir_inode_operations = {
-       .create         = nfs4_create,
+       .create         = nfs_create,
        .lookup         = nfs_lookup,
        .atomic_open    = nfs_atomic_open,
        .link           = nfs_link,
@@ -1582,42 +1580,6 @@ no_open:
        return nfs_lookup_revalidate(dentry, nd);
 }
 
-static int nfs4_create(struct inode *dir, struct dentry *dentry,
-                      umode_t mode, struct nameidata *nd)
-{
-       struct nfs_open_context *ctx = NULL;
-       struct iattr attr;
-       int error;
-       int open_flags = O_CREAT|O_EXCL;
-
-       dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
-                       dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
-
-       attr.ia_mode = mode;
-       attr.ia_valid = ATTR_MODE;
-
-       if (nd)
-               open_flags = nd->intent.open.flags;
-
-       ctx = create_nfs_open_context(dentry, open_flags);
-       error = PTR_ERR(ctx);
-       if (IS_ERR(ctx))
-               goto out_err_drop;
-
-       error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, ctx);
-       if (error != 0)
-               goto out_put_ctx;
-
-       put_nfs_open_context(ctx);
-
-       return 0;
-out_put_ctx:
-       put_nfs_open_context(ctx);
-out_err_drop:
-       d_drop(dentry);
-       return error;
-}
-
 #endif /* CONFIG_NFSV4 */
 
 /*
@@ -1684,7 +1646,7 @@ static int nfs_create(struct inode *dir, struct dentry *dentry,
        if (nd)
                open_flags = nd->intent.open.flags;
 
-       error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL);
+       error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
        if (error != 0)
                goto out_err;
        return 0;

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 2292a0f..3187e24 100644 (file)
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -314,7 +314,7 @@ static void nfs3_free_createdata(struct nfs3_createdata *data)
  */
 static int
 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
-                int flags, struct nfs_open_context *ctx)
+                int flags)
 {
        struct nfs3_createdata *data;
        umode_t mode = sattr->ia_mode;

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 15fc7e4..c157b20 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2806,37 +2806,22 @@ static int nfs4_proc_readlink(struct inode *inode, struct page *page,
 }
 
 /*
- * Got race?
- * We will need to arrange for the VFS layer to provide an atomic open.
- * Until then, this create/open method is prone to inefficiency and race
- * conditions due to the lookup, create, and open VFS calls from sys_open()
- * placed on the wire.
- *
- * Given the above sorry state of affairs, I'm simply sending an OPEN.
- * The file will be opened again in the subsequent VFS open call
- * (nfs4_proc_file_open).
- *
- * The open for read will just hang around to be used by any process that
- * opens the file O_RDONLY. This will all be resolved with the VFS changes.
+ * This is just for mknod.  open(O_CREAT) will always do ->open_context().
  */
-
 static int
 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
-                 int flags, struct nfs_open_context *ctx)
+                int flags)
 {
-       struct dentry *de = dentry;
+       struct nfs_open_context *ctx;
        struct nfs4_state *state;
-       struct rpc_cred *cred = NULL;
-       fmode_t fmode = 0;
        int status = 0;
 
-       if (ctx != NULL) {
-               cred = ctx->cred;
-               de = ctx->dentry;
-               fmode = ctx->mode;
-       }
+       ctx = alloc_nfs_open_context(dentry, FMODE_READ);
+       if (IS_ERR(ctx))
+               return PTR_ERR(ctx);
+
        sattr->ia_mode &= ~current_umask();
-       state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
+       state = nfs4_do_open(dir, dentry, ctx->mode, flags, sattr, ctx->cred, NULL);
        d_drop(dentry);
        if (IS_ERR(state)) {
                status = PTR_ERR(state);
@@ -2844,11 +2829,9 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
        }
        d_add(dentry, igrab(state->inode));
        nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
-       if (ctx != NULL)
-               ctx->state = state;
-       else
-               nfs4_close_sync(state, fmode);
+       ctx->state = state;
 out:
+       put_nfs_open_context(ctx);
        return status;
 }
 

diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 617c741..4433806 100644 (file)
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -259,7 +259,7 @@ static void nfs_free_createdata(const struct nfs_createdata *data)
 
 static int
 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
-               int flags, struct nfs_open_context *ctx)
+               int flags)
 {
        struct nfs_createdata *data;
        struct rpc_message msg = {

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 8aadd90..d3b7c18 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1374,7 +1374,7 @@ struct nfs_rpc_ops {
        int     (*readlink)(struct inode *, struct page *, unsigned int,
                            unsigned int);
        int     (*create)  (struct inode *, struct dentry *,
-                           struct iattr *, int, struct nfs_open_context *);
+                           struct iattr *, int);
        int     (*remove)  (struct inode *, struct qstr *);
        void    (*unlink_setup)  (struct rpc_message *, struct inode *dir);
        void    (*unlink_rpc_prepare) (struct rpc_task *, struct nfs_unlinkdata *);