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Commit 451146be authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Fix open(O_TRUNC) and ftruncate() error handling 



If the file wasn't opened for writing, then truncate and ftruncate
need to report the appropriate errors.

Reported-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
parent 55725513

fs/nfs/dir.c

+2 −2
Original line number Diff line number Diff line
@@ -1429,7 +1429,7 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry 
	}



	open_flags = nd->intent.open.flags;

	attr.ia_valid = 0;

	attr.ia_valid = ATTR_OPEN;



	ctx = create_nfs_open_context(dentry, open_flags);

	res = ERR_CAST(ctx);
@@ -1536,7 +1536,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) 
	if (IS_ERR(ctx))

		goto out;



	attr.ia_valid = 0;

	attr.ia_valid = ATTR_OPEN;

	if (openflags & O_TRUNC) {

		attr.ia_valid |= ATTR_SIZE;

		attr.ia_size = 0;

fs/nfs/nfs4proc.c

+12 −3
Original line number Diff line number Diff line
@@ -1954,10 +1954,19 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, 
	};

	int err;

	do {

		err = nfs4_handle_exception(server,

				_nfs4_do_setattr(inode, cred, fattr, sattr, state),

				&exception);

		err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);

		switch (err) {

		case -NFS4ERR_OPENMODE:

			if (state && !(state->state & FMODE_WRITE)) {

				err = -EBADF;

				if (sattr->ia_valid & ATTR_OPEN)

					err = -EACCES;

				goto out;

			}

		}

		err = nfs4_handle_exception(server, err, &exception);

	} while (exception.retry);

out:

	return err;

}