[PATCH v2 14/40] afs: Wrap most op->error accesses with inline funcs

[David Howells <dhowells@redhat.com>]

Wrap most op->error accesses with inline funcs which will make it easier
for a subsequent patch to replace op->error with something else.  Two
functions are added to this end:

 (1) afs_op_error() - Get the error code.

 (2) afs_op_set_error() - Set the error code.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
 fs/afs/dir.c          | 38 +++++++++++++++---------------
 fs/afs/file.c         |  4 ++--
 fs/afs/fs_operation.c | 21 ++++++++++-------
 fs/afs/fsclient.c     |  2 +-
 fs/afs/inode.c        |  2 +-
 fs/afs/internal.h     | 20 ++++++++++++----
 fs/afs/rotate.c       | 55 ++++++++++++++++++++++++-------------------
 fs/afs/server.c       |  6 ++---
 fs/afs/write.c        |  6 ++---
 9 files changed, 87 insertions(+), 67 deletions(-)

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 5219182e52e1..b40f7ae850a8 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -878,14 +878,14 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
 	 * lookups contained therein are stored in the reply without aborting
 	 * the whole operation.
 	 */
-	op->error = -ENOTSUPP;
+	afs_op_set_error(op, -ENOTSUPP);
 	if (!cookie->one_only) {
 		op->ops = &afs_inline_bulk_status_operation;
 		afs_begin_vnode_operation(op);
 		afs_wait_for_operation(op);
 	}
 
-	if (op->error == -ENOTSUPP) {
+	if (afs_op_error(op) == -ENOTSUPP) {
 		/* We could try FS.BulkStatus next, but this aborts the entire
 		 * op if any of the lookups fails - so, for the moment, revert
 		 * to FS.FetchStatus for op->file[1].
@@ -895,10 +895,10 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
 		afs_begin_vnode_operation(op);
 		afs_wait_for_operation(op);
 	}
-	inode = ERR_PTR(op->error);
+	inode = ERR_PTR(afs_op_error(op));
 
 out_op:
-	if (op->error == 0) {
+	if (!afs_op_error(op)) {
 		inode = &op->file[1].vnode->netfs.inode;
 		op->file[1].vnode = NULL;
 	}
@@ -1273,7 +1273,7 @@ static void afs_vnode_new_inode(struct afs_operation *op)
 
 	_enter("");
 
-	ASSERTCMP(op->error, ==, 0);
+	ASSERTCMP(afs_op_error(op), ==, 0);
 
 	inode = afs_iget(op, vp);
 	if (IS_ERR(inode)) {
@@ -1286,7 +1286,7 @@ static void afs_vnode_new_inode(struct afs_operation *op)
 
 	vnode = AFS_FS_I(inode);
 	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
-	if (!op->error)
+	if (!afs_op_error(op))
 		afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
 	d_instantiate(op->dentry, inode);
 }
@@ -1320,7 +1320,7 @@ static void afs_create_put(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
 
-	if (op->error)
+	if (afs_op_error(op))
 		d_drop(op->dentry);
 }
 
@@ -1480,7 +1480,7 @@ static void afs_dir_remove_link(struct afs_operation *op)
 	struct dentry *dentry = op->dentry;
 	int ret;
 
-	if (op->error != 0 ||
+	if (afs_op_error(op) ||
 	    (op->file[1].scb.have_status && op->file[1].scb.have_error))
 		return;
 	if (d_really_is_positive(dentry))
@@ -1504,10 +1504,10 @@ static void afs_dir_remove_link(struct afs_operation *op)
 
 		ret = afs_validate(vnode, op->key);
 		if (ret != -ESTALE)
-			op->error = ret;
+			afs_op_set_error(op, ret);
 	}
 
-	_debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
+	_debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, afs_op_error(op));
 }
 
 static void afs_unlink_success(struct afs_operation *op)
@@ -1538,7 +1538,7 @@ static void afs_unlink_edit_dir(struct afs_operation *op)
 static void afs_unlink_put(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
-	if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
+	if (op->unlink.need_rehash && afs_op_error(op) < 0 && afs_op_error(op) != -ENOENT)
 		d_rehash(op->dentry);
 }
 
@@ -1579,7 +1579,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 	/* Try to make sure we have a callback promise on the victim. */
 	ret = afs_validate(vnode, op->key);
 	if (ret < 0) {
-		op->error = ret;
+		afs_op_set_error(op, ret);
 		goto error;
 	}
 
@@ -1588,7 +1588,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 		spin_unlock(&dentry->d_lock);
 		/* Start asynchronous writeout of the inode */
 		write_inode_now(d_inode(dentry), 0);
-		op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
+		afs_op_set_error(op, afs_sillyrename(dvnode, vnode, dentry, op->key));
 		goto error;
 	}
 	if (!d_unhashed(dentry)) {
@@ -1609,7 +1609,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 	/* If there was a conflict with a third party, check the status of the
 	 * unlinked vnode.
 	 */
-	if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+	if (afs_op_error(op) == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
 		op->file[1].update_ctime = false;
 		op->fetch_status.which = 1;
 		op->ops = &afs_fetch_status_operation;
@@ -1691,7 +1691,7 @@ static void afs_link_success(struct afs_operation *op)
 static void afs_link_put(struct afs_operation *op)
 {
 	_enter("op=%08x", op->debug_id);
-	if (op->error)
+	if (afs_op_error(op))
 		d_drop(op->dentry);
 }
 
@@ -1889,7 +1889,7 @@ static void afs_rename_put(struct afs_operation *op)
 	if (op->rename.rehash)
 		d_rehash(op->rename.rehash);
 	dput(op->rename.tmp);
-	if (op->error)
+	if (afs_op_error(op))
 		d_rehash(op->dentry);
 }
 
@@ -1934,7 +1934,7 @@ static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		return PTR_ERR(op);
 
 	ret = afs_validate(vnode, op->key);
-	op->error = ret;
+	afs_op_set_error(op, ret);
 	if (ret < 0)
 		goto error;
 
@@ -1971,7 +1971,7 @@ static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			op->rename.tmp = d_alloc(new_dentry->d_parent,
 						 &new_dentry->d_name);
 			if (!op->rename.tmp) {
-				op->error = -ENOMEM;
+				afs_op_nomem(op);
 				goto error;
 			}
 
@@ -1979,7 +1979,7 @@ static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 					      AFS_FS_I(d_inode(new_dentry)),
 					      new_dentry, op->key);
 			if (ret) {
-				op->error = ret;
+				afs_op_set_error(op, ret);
 				goto error;
 			}
 
diff --git a/fs/afs/file.c b/fs/afs/file.c
index d37dd201752b..0c81c39c32f5 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -243,7 +243,7 @@ static void afs_fetch_data_notify(struct afs_operation *op)
 {
 	struct afs_read *req = op->fetch.req;
 	struct netfs_io_subrequest *subreq = req->subreq;
-	int error = op->error;
+	int error = afs_op_error(op);
 
 	if (error == -ECONNABORTED)
 		error = afs_abort_to_error(op->ac.abort_code);
@@ -271,7 +271,7 @@ static void afs_fetch_data_success(struct afs_operation *op)
 
 static void afs_fetch_data_put(struct afs_operation *op)
 {
-	op->fetch.req->error = op->error;
+	op->fetch.req->error = afs_op_error(op);
 	afs_put_read(op->fetch.req);
 }
 
diff --git a/fs/afs/fs_operation.c b/fs/afs/fs_operation.c
index 3e31fae9a149..bfb9a7634bd9 100644
--- a/fs/afs/fs_operation.c
+++ b/fs/afs/fs_operation.c
@@ -40,8 +40,8 @@ struct afs_operation *afs_alloc_operation(struct key *key, struct afs_volume *vo
 	op->net		= volume->cell->net;
 	op->cb_v_break	= volume->cb_v_break;
 	op->debug_id	= atomic_inc_return(&afs_operation_debug_counter);
-	op->error	= -EDESTADDRREQ;
 	op->nr_iterations = -1;
+	afs_op_set_error(op, -EDESTADDRREQ);
 
 	_leave(" = [op=%08x]", op->debug_id);
 	return op;
@@ -71,7 +71,7 @@ static bool afs_get_io_locks(struct afs_operation *op)
 		swap(vnode, vnode2);
 
 	if (mutex_lock_interruptible(&vnode->io_lock) < 0) {
-		op->error = -ERESTARTSYS;
+		afs_op_set_error(op, -ERESTARTSYS);
 		op->flags |= AFS_OPERATION_STOP;
 		_leave(" = f [I 0]");
 		return false;
@@ -80,7 +80,7 @@ static bool afs_get_io_locks(struct afs_operation *op)
 
 	if (vnode2) {
 		if (mutex_lock_interruptible_nested(&vnode2->io_lock, 1) < 0) {
-			op->error = -ERESTARTSYS;
+			afs_op_set_error(op, -ERESTARTSYS);
 			op->flags |= AFS_OPERATION_STOP;
 			mutex_unlock(&vnode->io_lock);
 			op->flags &= ~AFS_OPERATION_LOCK_0;
@@ -159,11 +159,14 @@ static void afs_end_vnode_operation(struct afs_operation *op)
 {
 	_enter("");
 
-	if (op->error == -EDESTADDRREQ ||
-	    op->error == -EADDRNOTAVAIL ||
-	    op->error == -ENETUNREACH ||
-	    op->error == -EHOSTUNREACH)
+	switch (afs_op_error(op)) {
+	case -EDESTADDRREQ:
+	case -EADDRNOTAVAIL:
+	case -ENETUNREACH:
+	case -EHOSTUNREACH:
 		afs_dump_edestaddrreq(op);
+		break;
+	}
 
 	afs_drop_io_locks(op);
 
@@ -209,7 +212,7 @@ void afs_wait_for_operation(struct afs_operation *op)
 
 	afs_end_vnode_operation(op);
 
-	if (op->error == 0 && op->ops->edit_dir) {
+	if (!afs_op_error(op) && op->ops->edit_dir) {
 		_debug("edit_dir");
 		op->ops->edit_dir(op);
 	}
@@ -221,7 +224,7 @@ void afs_wait_for_operation(struct afs_operation *op)
  */
 int afs_put_operation(struct afs_operation *op)
 {
-	int i, ret = op->error;
+	int i, ret = afs_op_error(op);
 
 	_enter("op=%08x,%d", op->debug_id, ret);
 
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 7d37f63ef0f0..6821ce0f9d63 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -1899,7 +1899,7 @@ void afs_fs_inline_bulk_status(struct afs_operation *op)
 	int i;
 
 	if (test_bit(AFS_SERVER_FL_NO_IBULK, &op->server->flags)) {
-		op->error = -ENOTSUPP;
+		afs_op_set_error(op, -ENOTSUPP);
 		return;
 	}
 
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index a6ae74d5b698..f44a8a48bf24 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -331,7 +331,7 @@ static void afs_fetch_status_success(struct afs_operation *op)
 
 	if (vnode->netfs.inode.i_state & I_NEW) {
 		ret = afs_inode_init_from_status(op, vp, vnode);
-		op->error = ret;
+		afs_op_set_error(op, ret);
 		if (ret == 0)
 			afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
 	} else {
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index e43aef74c241..5c2d93023d17 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1140,11 +1140,6 @@ extern bool afs_begin_vnode_operation(struct afs_operation *);
 extern void afs_wait_for_operation(struct afs_operation *);
 extern int afs_do_sync_operation(struct afs_operation *);
 
-static inline void afs_op_nomem(struct afs_operation *op)
-{
-	op->error = -ENOMEM;
-}
-
 static inline void afs_op_set_vnode(struct afs_operation *op, unsigned int n,
 				    struct afs_vnode *vnode)
 {
@@ -1238,6 +1233,21 @@ static inline void __afs_stat(atomic_t *s)
 extern int afs_abort_to_error(u32);
 extern void afs_prioritise_error(struct afs_error *, int, u32);
 
+static inline void afs_op_nomem(struct afs_operation *op)
+{
+	op->error = -ENOMEM;
+}
+
+static inline int afs_op_error(const struct afs_operation *op)
+{
+	return op->error;
+}
+
+static inline int afs_op_set_error(struct afs_operation *op, int error)
+{
+	return op->error = error;
+}
+
 /*
  * mntpt.c
  */
diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c
index 4d2317a66385..965ee8f0804a 100644
--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -51,7 +51,7 @@ static bool afs_start_fs_iteration(struct afs_operation *op,
 		 * and have to return an error.
 		 */
 		if (op->flags & AFS_OPERATION_CUR_ONLY) {
-			op->error = -ESTALE;
+			afs_op_set_error(op, -ESTALE);
 			return false;
 		}
 
@@ -93,7 +93,7 @@ static bool afs_sleep_and_retry(struct afs_operation *op)
 	if (!(op->flags & AFS_OPERATION_UNINTR)) {
 		msleep_interruptible(1000);
 		if (signal_pending(current)) {
-			op->error = -ERESTARTSYS;
+			afs_op_set_error(op, -ERESTARTSYS);
 			return false;
 		}
 	} else {
@@ -137,7 +137,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 	case 0:
 	default:
 		/* Success or local failure.  Stop. */
-		op->error = error;
+		afs_op_set_error(op, error);
 		op->flags |= AFS_OPERATION_STOP;
 		_leave(" = f [okay/local %d]", error);
 		return false;
@@ -174,11 +174,13 @@ bool afs_select_fileserver(struct afs_operation *op)
 
 			set_bit(AFS_VOLUME_NEEDS_UPDATE, &op->volume->flags);
 			error = afs_check_volume_status(op->volume, op);
-			if (error < 0)
-				goto failed_set_error;
+			if (error < 0) {
+				afs_op_set_error(op, error);
+				goto failed;
+			}
 
 			if (test_bit(AFS_VOLUME_DELETED, &op->volume->flags)) {
-				op->error = -ENOMEDIUM;
+				afs_op_set_error(op, -ENOMEDIUM);
 				goto failed;
 			}
 
@@ -250,11 +252,11 @@ bool afs_select_fileserver(struct afs_operation *op)
 				clear_bit(AFS_VOLUME_BUSY, &op->volume->flags);
 			}
 			if (op->flags & AFS_OPERATION_NO_VSLEEP) {
-				op->error = -EADV;
+				afs_op_set_error(op, -EADV);
 				goto failed;
 			}
 			if (op->flags & AFS_OPERATION_CUR_ONLY) {
-				op->error = -ESTALE;
+				afs_op_set_error(op, -ESTALE);
 				goto failed;
 			}
 			goto busy;
@@ -275,7 +277,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 			 * lock we need to maintain.
 			 */
 			if (op->flags & AFS_OPERATION_NO_VSLEEP) {
-				op->error = -EBUSY;
+				afs_op_set_error(op, -EBUSY);
 				goto failed;
 			}
 			if (!test_and_set_bit(AFS_VOLUME_BUSY, &op->volume->flags)) {
@@ -304,7 +306,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 			 * honour, just in case someone sets up a loop.
 			 */
 			if (op->flags & AFS_OPERATION_VMOVED) {
-				op->error = -EREMOTEIO;
+				afs_op_set_error(op, -EREMOTEIO);
 				goto failed;
 			}
 			op->flags |= AFS_OPERATION_VMOVED;
@@ -312,8 +314,10 @@ bool afs_select_fileserver(struct afs_operation *op)
 			set_bit(AFS_VOLUME_WAIT, &op->volume->flags);
 			set_bit(AFS_VOLUME_NEEDS_UPDATE, &op->volume->flags);
 			error = afs_check_volume_status(op->volume, op);
-			if (error < 0)
-				goto failed_set_error;
+			if (error < 0) {
+				afs_op_set_error(op, error);
+				goto failed;
+			}
 
 			/* If the server list didn't change, then the VLDB is
 			 * out of sync with the fileservers.  This is hopefully
@@ -344,7 +348,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 			 * Translate locally and return ENOSPC.
 			 * No replicas to failover to.
 			 */
-			op->error = -ENOSPC;
+			afs_op_set_error(op, -ENOSPC);
 			goto failed_but_online;
 
 		case VOVERQUOTA:
@@ -353,7 +357,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 			 * Translate locally and return EDQUOT.
 			 * No replicas to failover to.
 			 */
-			op->error = -EDQUOT;
+			afs_op_set_error(op, -EDQUOT);
 			goto failed_but_online;
 
 		default:
@@ -366,7 +370,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 
 	case -ETIMEDOUT:
 	case -ETIME:
-		if (op->error != -EDESTADDRREQ)
+		if (afs_op_error(op) != -EDESTADDRREQ)
 			goto iterate_address;
 		fallthrough;
 	case -ERFKILL:
@@ -385,7 +389,7 @@ bool afs_select_fileserver(struct afs_operation *op)
 		fallthrough;
 	case -ECONNRESET:
 		_debug("call reset");
-		op->error = error;
+		afs_op_set_error(op, error);
 		goto failed;
 	}
 
@@ -401,8 +405,10 @@ bool afs_select_fileserver(struct afs_operation *op)
 	 * volume may have moved or even have been deleted.
 	 */
 	error = afs_check_volume_status(op->volume, op);
-	if (error < 0)
-		goto failed_set_error;
+	if (error < 0) {
+		afs_op_set_error(op, error);
+		goto failed;
+	}
 
 	if (!afs_start_fs_iteration(op, vnode))
 		goto failed;
@@ -413,8 +419,10 @@ bool afs_select_fileserver(struct afs_operation *op)
 	_debug("pick [%lx]", op->untried);
 
 	error = afs_wait_for_fs_probes(op->server_list, op->untried);
-	if (error < 0)
-		goto failed_set_error;
+	if (error < 0) {
+		afs_op_set_error(op, error);
+		goto failed;
+	}
 
 	/* Pick the untried server with the lowest RTT.  If we have outstanding
 	 * callbacks, we stick with the server we're already using if we can.
@@ -515,7 +523,8 @@ bool afs_select_fileserver(struct afs_operation *op)
 			op->flags &= ~AFS_OPERATION_RETRY_SERVER;
 			goto retry_server;
 		case -ERESTARTSYS:
-			goto failed_set_error;
+			afs_op_set_error(op, error);
+			goto failed;
 		case -ETIME:
 		case -EDESTADDRREQ:
 			goto next_server;
@@ -544,13 +553,11 @@ bool afs_select_fileserver(struct afs_operation *op)
 	}
 
 	error = e.error;
-
-failed_set_error:
 	op->error = error;
 failed:
 	op->flags |= AFS_OPERATION_STOP;
 	afs_end_cursor(&op->ac);
-	_leave(" = f [failed %d]", op->error);
+	_leave(" = f [failed %d]", afs_op_error(op));
 	return false;
 }
 
diff --git a/fs/afs/server.c b/fs/afs/server.c
index 5b5fa94005c9..2826e6eced71 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -629,8 +629,8 @@ static noinline bool afs_update_server_record(struct afs_operation *op,
 			_leave(" = t [intr]");
 			return true;
 		}
-		op->error = PTR_ERR(alist);
-		_leave(" = f [%d]", op->error);
+		afs_op_set_error(op, PTR_ERR(alist));
+		_leave(" = f [%d]", afs_op_error(op));
 		return false;
 	}
 
@@ -684,7 +684,7 @@ bool afs_check_server_record(struct afs_operation *op, struct afs_server *server
 			  (op->flags & AFS_OPERATION_UNINTR) ?
 			  TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
 	if (ret == -ERESTARTSYS) {
-		op->error = ret;
+		afs_op_set_error(op, ret);
 		_leave(" = f [intr]");
 		return false;
 	}
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 4a168781936b..9f90d8970ce9 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -366,7 +366,7 @@ static void afs_store_data_success(struct afs_operation *op)
 
 	op->ctime = op->file[0].scb.status.mtime_client;
 	afs_vnode_commit_status(op, &op->file[0]);
-	if (op->error == 0) {
+	if (!afs_op_error(op)) {
 		if (!op->store.laundering)
 			afs_pages_written_back(vnode, op->store.pos, op->store.size);
 		afs_stat_v(vnode, n_stores);
@@ -428,7 +428,7 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t
 
 	afs_wait_for_operation(op);
 
-	switch (op->error) {
+	switch (afs_op_error(op)) {
 	case -EACCES:
 	case -EPERM:
 	case -ENOKEY:
@@ -447,7 +447,7 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t
 	}
 
 	afs_put_wb_key(wbk);
-	_leave(" = %d", op->error);
+	_leave(" = %d", afs_op_error(op));
 	return afs_put_operation(op);
 }