Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:
 "Assorted fixes all over the place.

  The iov_iter one is this cycle regression (splice from UDP triggering
  WARN_ON()), the rest is older"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  afs: Use d_instantiate() rather than d_add() and don't d_drop()
  afs: Fix missing net error handling
  afs: Fix validation/callback interaction
  iov_iter: teach csum_and_copy_to_iter() to handle pipe-backed ones
  exportfs: do not read dentry after free
  exportfs: fix 'passing zero to ERR_PTR()' warning
  aio: fix failure to put the file pointer
  sysv: return 'err' instead of 0 in __sysv_write_inode

11 files changed, 152 insertions, 124 deletions

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 43dea3b00c29..8a2562e3a316 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1075,8 +1075,6 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 	if (fc->ac.error < 0)
 		return;
 
-	d_drop(new_dentry);
-
 	inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
 			 newfid, newstatus, newcb, fc->cbi);
 	if (IS_ERR(inode)) {
@@ -1090,7 +1088,7 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 	vnode = AFS_FS_I(inode);
 	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
 	afs_vnode_commit_status(fc, vnode, 0);
-	d_add(new_dentry, inode);
+	d_instantiate(new_dentry, inode);
 }
 
 /*
diff --git a/fs/afs/fs_probe.c b/fs/afs/fs_probe.c
index d049cb459742..fde6b4d4121e 100644
--- a/fs/afs/fs_probe.c
+++ b/fs/afs/fs_probe.c
@@ -61,8 +61,11 @@ void afs_fileserver_probe_result(struct afs_call *call)
 		afs_io_error(call, afs_io_error_fs_probe_fail);
 		goto out;
 	case -ECONNRESET: /* Responded, but call expired. */
+	case -ERFKILL:
+	case -EADDRNOTAVAIL:
 	case -ENETUNREACH:
 	case -EHOSTUNREACH:
+	case -EHOSTDOWN:
 	case -ECONNREFUSED:
 	case -ETIMEDOUT:
 	case -ETIME:
@@ -132,12 +135,14 @@ out:
 static int afs_do_probe_fileserver(struct afs_net *net,
 				   struct afs_server *server,
 				   struct key *key,
-				   unsigned int server_index)
+				   unsigned int server_index,
+				   struct afs_error *_e)
 {
 	struct afs_addr_cursor ac = {
 		.index = 0,
 	};
-	int ret;
+	bool in_progress = false;
+	int err;
 
 	_enter("%pU", &server->uuid);
 
@@ -151,15 +156,17 @@ static int afs_do_probe_fileserver(struct afs_net *net,
 	server->probe.rtt = UINT_MAX;
 
 	for (ac.index = 0; ac.index < ac.alist->nr_addrs; ac.index++) {
-		ret = afs_fs_get_capabilities(net, server, &ac, key, server_index,
+		err = afs_fs_get_capabilities(net, server, &ac, key, server_index,
 					      true);
-		if (ret != -EINPROGRESS) {
-			afs_fs_probe_done(server);
-			return ret;
-		}
+		if (err == -EINPROGRESS)
+			in_progress = true;
+		else
+			afs_prioritise_error(_e, err, ac.abort_code);
 	}
 
-	return 0;
+	if (!in_progress)
+		afs_fs_probe_done(server);
+	return in_progress;
 }
 
 /*
@@ -169,21 +176,23 @@ int afs_probe_fileservers(struct afs_net *net, struct key *key,
 			  struct afs_server_list *list)
 {
 	struct afs_server *server;
-	int i, ret;
+	struct afs_error e;
+	bool in_progress = false;
+	int i;
 
+	e.error = 0;
+	e.responded = false;
 	for (i = 0; i < list->nr_servers; i++) {
 		server = list->servers[i].server;
 		if (test_bit(AFS_SERVER_FL_PROBED, &server->flags))
 			continue;
 
-		if (!test_and_set_bit_lock(AFS_SERVER_FL_PROBING, &server->flags)) {
-			ret = afs_do_probe_fileserver(net, server, key, i);
-			if (ret)
-				return ret;
-		}
+		if (!test_and_set_bit_lock(AFS_SERVER_FL_PROBING, &server->flags) &&
+		    afs_do_probe_fileserver(net, server, key, i, &e))
+			in_progress = true;
 	}
 
-	return 0;
+	return in_progress ? 0 : e.error;
 }
 
 /*
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 4c6d8e1112c2..6b17d3620414 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -382,7 +382,7 @@ void afs_zap_data(struct afs_vnode *vnode)
 int afs_validate(struct afs_vnode *vnode, struct key *key)
 {
 	time64_t now = ktime_get_real_seconds();
-	bool valid = false;
+	bool valid;
 	int ret;
 
 	_enter("{v={%llx:%llu} fl=%lx},%x",
@@ -402,15 +402,21 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
 			vnode->cb_v_break = vnode->volume->cb_v_break;
 			valid = false;
 		} else if (vnode->status.type == AFS_FTYPE_DIR &&
-			   test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
-			   vnode->cb_expires_at - 10 > now) {
-			valid = true;
-		} else if (!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
-			   vnode->cb_expires_at - 10 > now) {
+			   (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
+			    vnode->cb_expires_at - 10 <= now)) {
+			valid = false;
+		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
+			   vnode->cb_expires_at - 10 <= now) {
+			valid = false;
+		} else {
 			valid = true;
 		}
 	} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
 		valid = true;
+	} else {
+		vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
+		vnode->cb_v_break = vnode->volume->cb_v_break;
+		valid = false;
 	}
 
 	read_sequnlock_excl(&vnode->cb_lock);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 5da3b09b7518..8871b9e8645f 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -696,6 +696,14 @@ struct afs_interface {
 };
 
 /*
+ * Error prioritisation and accumulation.
+ */
+struct afs_error {
+	short	error;			/* Accumulated error */
+	bool	responded;		/* T if server responded */
+};
+
+/*
  * Cursor for iterating over a server's address list.
  */
 struct afs_addr_cursor {
@@ -1015,6 +1023,7 @@ static inline void __afs_stat(atomic_t *s)
  * misc.c
  */
 extern int afs_abort_to_error(u32);
+extern void afs_prioritise_error(struct afs_error *, int, u32);
 
 /*
  * mntpt.c
diff --git a/fs/afs/misc.c b/fs/afs/misc.c
index 700a5fa7f4ec..bbb1fd51b019 100644
--- a/fs/afs/misc.c
+++ b/fs/afs/misc.c
@@ -118,3 +118,55 @@ int afs_abort_to_error(u32 abort_code)
 	default:		return -EREMOTEIO;
 	}
 }
+
+/*
+ * Select the error to report from a set of errors.
+ */
+void afs_prioritise_error(struct afs_error *e, int error, u32 abort_code)
+{
+	switch (error) {
+	case 0:
+		return;
+	default:
+		if (e->error == -ETIMEDOUT ||
+		    e->error == -ETIME)
+			return;
+	case -ETIMEDOUT:
+	case -ETIME:
+		if (e->error == -ENOMEM ||
+		    e->error == -ENONET)
+			return;
+	case -ENOMEM:
+	case -ENONET:
+		if (e->error == -ERFKILL)
+			return;
+	case -ERFKILL:
+		if (e->error == -EADDRNOTAVAIL)
+			return;
+	case -EADDRNOTAVAIL:
+		if (e->error == -ENETUNREACH)
+			return;
+	case -ENETUNREACH:
+		if (e->error == -EHOSTUNREACH)
+			return;
+	case -EHOSTUNREACH:
+		if (e->error == -EHOSTDOWN)
+			return;
+	case -EHOSTDOWN:
+		if (e->error == -ECONNREFUSED)
+			return;
+	case -ECONNREFUSED:
+		if (e->error == -ECONNRESET)
+			return;
+	case -ECONNRESET: /* Responded, but call expired. */
+		if (e->responded)
+			return;
+		e->error = error;
+		return;
+
+	case -ECONNABORTED:
+		e->responded = true;
+		e->error = afs_abort_to_error(abort_code);
+		return;
+	}
+}
diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c
index 00504254c1c2..c3ae324781f8 100644
--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -136,7 +136,8 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
 	struct afs_addr_list *alist;
 	struct afs_server *server;
 	struct afs_vnode *vnode = fc->vnode;
-	u32 rtt, abort_code;
+	struct afs_error e;
+	u32 rtt;
 	int error = fc->ac.error, i;
 
 	_enter("%lx[%d],%lx[%d],%d,%d",
@@ -306,8 +307,11 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
 		if (fc->error != -EDESTADDRREQ)
 			goto iterate_address;
 		/* Fall through */
+	case -ERFKILL:
+	case -EADDRNOTAVAIL:
 	case -ENETUNREACH:
 	case -EHOSTUNREACH:
+	case -EHOSTDOWN:
 	case -ECONNREFUSED:
 		_debug("no conn");
 		fc->error = error;
@@ -446,50 +450,15 @@ no_more_servers:
 	if (fc->flags & AFS_FS_CURSOR_VBUSY)
 		goto restart_from_beginning;
 
-	abort_code = 0;
-	error = -EDESTADDRREQ;
+	e.error = -EDESTADDRREQ;
+	e.responded = false;
 	for (i = 0; i < fc->server_list->nr_servers; i++) {
 		struct afs_server *s = fc->server_list->servers[i].server;
-		int probe_error = READ_ONCE(s->probe.error);
 
-		switch (probe_error) {
-		case 0:
-			continue;
-		default:
-			if (error == -ETIMEDOUT ||
-			    error == -ETIME)
-				continue;
-		case -ETIMEDOUT:
-		case -ETIME:
-			if (error == -ENOMEM ||
-			    error == -ENONET)
-				continue;
-		case -ENOMEM:
-		case -ENONET:
-			if (error == -ENETUNREACH)
-				continue;
-		case -ENETUNREACH:
-			if (error == -EHOSTUNREACH)
-				continue;
-		case -EHOSTUNREACH:
-			if (error == -ECONNREFUSED)
-				continue;
-		case -ECONNREFUSED:
-			if (error == -ECONNRESET)
-				continue;
-		case -ECONNRESET: /* Responded, but call expired. */
-			if (error == -ECONNABORTED)
-				continue;
-		case -ECONNABORTED:
-			abort_code = s->probe.abort_code;
-			error = probe_error;
-			continue;
-		}
+		afs_prioritise_error(&e, READ_ONCE(s->probe.error),
+				     s->probe.abort_code);
 	}
 
-	if (error == -ECONNABORTED)
-		error = afs_abort_to_error(abort_code);
-
 failed_set_error:
 	fc->error = error;
 failed:
@@ -553,8 +522,11 @@ bool afs_select_current_fileserver(struct afs_fs_cursor *fc)
 		_leave(" = f [abort]");
 		return false;
 
+	case -ERFKILL:
+	case -EADDRNOTAVAIL:
 	case -ENETUNREACH:
 	case -EHOSTUNREACH:
+	case -EHOSTDOWN:
 	case -ECONNREFUSED:
 	case -ETIMEDOUT:
 	case -ETIME:
@@ -633,6 +605,7 @@ int afs_end_vnode_operation(struct afs_fs_cursor *fc)
 	struct afs_net *net = afs_v2net(fc->vnode);
 
 	if (fc->error == -EDESTADDRREQ ||
+	    fc->error == -EADDRNOTAVAIL ||
 	    fc->error == -ENETUNREACH ||
 	    fc->error == -EHOSTUNREACH)
 		afs_dump_edestaddrreq(fc);
diff --git a/fs/afs/vl_probe.c b/fs/afs/vl_probe.c
index c0f616bd70cb..f0b032976487 100644
--- a/fs/afs/vl_probe.c
+++ b/fs/afs/vl_probe.c
@@ -61,8 +61,11 @@ void afs_vlserver_probe_result(struct afs_call *call)
 		afs_io_error(call, afs_io_error_vl_probe_fail);
 		goto out;
 	case -ECONNRESET: /* Responded, but call expired. */
+	case -ERFKILL:
+	case -EADDRNOTAVAIL:
 	case -ENETUNREACH:
 	case -EHOSTUNREACH:
+	case -EHOSTDOWN:
 	case -ECONNREFUSED:
 	case -ETIMEDOUT:
 	case -ETIME:
@@ -129,15 +132,17 @@ out:
  * Probe all of a vlserver's addresses to find out the best route and to
  * query its capabilities.
  */
-static int afs_do_probe_vlserver(struct afs_net *net,
-				 struct afs_vlserver *server,
-				 struct key *key,
-				 unsigned int server_index)
+static bool afs_do_probe_vlserver(struct afs_net *net,
+				  struct afs_vlserver *server,
+				  struct key *key,
+				  unsigned int server_index,
+				  struct afs_error *_e)
 {
 	struct afs_addr_cursor ac = {
 		.index = 0,
 	};
-	int ret;
+	bool in_progress = false;
+	int err;
 
 	_enter("%s", server->name);
 
@@ -151,15 +156,17 @@ static int afs_do_probe_vlserver(struct afs_net *net,
 	server->probe.rtt = UINT_MAX;
 
 	for (ac.index = 0; ac.index < ac.alist->nr_addrs; ac.index++) {
-		ret = afs_vl_get_capabilities(net, &ac, key, server,
+		err = afs_vl_get_capabilities(net, &ac, key, server,
 					      server_index, true);
-		if (ret != -EINPROGRESS) {
-			afs_vl_probe_done(server);
-			return ret;
-		}
+		if (err == -EINPROGRESS)
+			in_progress = true;
+		else
+			afs_prioritise_error(_e, err, ac.abort_code);
 	}
 
-	return 0;
+	if (!in_progress)
+		afs_vl_probe_done(server);
+	return in_progress;
 }
 
 /*
@@ -169,21 +176,23 @@ int afs_send_vl_probes(struct afs_net *net, struct key *key,
 		       struct afs_vlserver_list *vllist)
 {
 	struct afs_vlserver *server;
-	int i, ret;
+	struct afs_error e;
+	bool in_progress = false;
+	int i;
 
+	e.error = 0;
+	e.responded = false;
 	for (i = 0; i < vllist->nr_servers; i++) {
 		server = vllist->servers[i].server;
 		if (test_bit(AFS_VLSERVER_FL_PROBED, &server->flags))
 			continue;
 
-		if (!test_and_set_bit_lock(AFS_VLSERVER_FL_PROBING, &server->flags)) {
-			ret = afs_do_probe_vlserver(net, server, key, i);
-			if (ret)
-				return ret;
-		}
+		if (!test_and_set_bit_lock(AFS_VLSERVER_FL_PROBING, &server->flags) &&
+		    afs_do_probe_vlserver(net, server, key, i, &e))
+			in_progress = true;
 	}
 
-	return 0;
+	return in_progress ? 0 : e.error;
 }
 
 /*
diff --git a/fs/afs/vl_rotate.c b/fs/afs/vl_rotate.c
index b64a284b99d2..7adde83a0648 100644
--- a/fs/afs/vl_rotate.c
+++ b/fs/afs/vl_rotate.c
@@ -71,8 +71,9 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
 {
 	struct afs_addr_list *alist;
 	struct afs_vlserver *vlserver;
+	struct afs_error e;
 	u32 rtt;
-	int error = vc->ac.error, abort_code, i;
+	int error = vc->ac.error, i;
 
 	_enter("%lx[%d],%lx[%d],%d,%d",
 	       vc->untried, vc->index,
@@ -119,8 +120,11 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
 			goto failed;
 		}
 
+	case -ERFKILL:
+	case -EADDRNOTAVAIL:
 	case -ENETUNREACH:
 	case -EHOSTUNREACH:
+	case -EHOSTDOWN:
 	case -ECONNREFUSED:
 	case -ETIMEDOUT:
 	case -ETIME:
@@ -235,50 +239,15 @@ no_more_servers:
 	if (vc->flags & AFS_VL_CURSOR_RETRY)
 		goto restart_from_beginning;
 
-	abort_code = 0;
-	error = -EDESTADDRREQ;
+	e.error = -EDESTADDRREQ;
+	e.responded = false;
 	for (i = 0; i < vc->server_list->nr_servers; i++) {
 		struct afs_vlserver *s = vc->server_list->servers[i].server;
-		int probe_error = READ_ONCE(s->probe.error);
 
-		switch (probe_error) {
-		case 0:
-			continue;
-		default:
-			if (error == -ETIMEDOUT ||
-			    error == -ETIME)
-				continue;
-		case -ETIMEDOUT:
-		case -ETIME:
-			if (error == -ENOMEM ||
-			    error == -ENONET)
-				continue;
-		case -ENOMEM:
-		case -ENONET:
-			if (error == -ENETUNREACH)
-				continue;
-		case -ENETUNREACH:
-			if (error == -EHOSTUNREACH)
-				continue;
-		case -EHOSTUNREACH:
-			if (error == -ECONNREFUSED)
-				continue;
-		case -ECONNREFUSED:
-			if (error == -ECONNRESET)
-				continue;
-		case -ECONNRESET: /* Responded, but call expired. */
-			if (error == -ECONNABORTED)
-				continue;
-		case -ECONNABORTED:
-			abort_code = s->probe.abort_code;
-			error = probe_error;
-			continue;
-		}
+		afs_prioritise_error(&e, READ_ONCE(s->probe.error),
+				     s->probe.abort_code);
 	}
 
-	if (error == -ECONNABORTED)
-		error = afs_abort_to_error(abort_code);
-
 failed_set_error:
 	vc->error = error;
 failed:
@@ -341,6 +310,7 @@ int afs_end_vlserver_operation(struct afs_vl_cursor *vc)
 	struct afs_net *net = vc->cell->net;
 
 	if (vc->error == -EDESTADDRREQ ||
+	    vc->error == -EADDRNOTAVAIL ||
 	    vc->error == -ENETUNREACH ||
 	    vc->error == -EHOSTUNREACH)
 		afs_vl_dump_edestaddrreq(vc);
diff --git a/fs/aio.c b/fs/aio.c
index 301e6314183b..97f983592925 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1436,6 +1436,7 @@ static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
 		ret = ioprio_check_cap(iocb->aio_reqprio);
 		if (ret) {
 			pr_debug("aio ioprio check cap error: %d\n", ret);
+			fput(req->ki_filp);
 			return ret;
 		}
 
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 645158dc33f1..c69927bed4ef 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -77,7 +77,7 @@ static bool dentry_connected(struct dentry *dentry)
 		struct dentry *parent = dget_parent(dentry);
 
 		dput(dentry);
-		if (IS_ROOT(dentry)) {
+		if (dentry == parent) {
 			dput(parent);
 			return false;
 		}
@@ -147,6 +147,7 @@ static struct dentry *reconnect_one(struct vfsmount *mnt,
 	tmp = lookup_one_len_unlocked(nbuf, parent, strlen(nbuf));
 	if (IS_ERR(tmp)) {
 		dprintk("%s: lookup failed: %d\n", __func__, PTR_ERR(tmp));
+		err = PTR_ERR(tmp);
 		goto out_err;
 	}
 	if (tmp != dentry) {
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index 499a20a5a010..273736f41be3 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -275,7 +275,7 @@ static int __sysv_write_inode(struct inode *inode, int wait)
                 }
         }
 	brelse(bh);
-	return 0;
+	return err;
 }
 
 int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)