afs: Mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Notice that in many cases I placed a /* Fall through */ comment
at the bottom of the case, which what GCC is expecting to find.

In other cases I had to tweak a bit the format of the comments.

This patch suppresses ALL missing-break-in-switch false positives
in fs/afs

Addresses-Coverity-ID: 115042 ("Missing break in switch")
Addresses-Coverity-ID: 115043 ("Missing break in switch")
Addresses-Coverity-ID: 115045 ("Missing break in switch")
Addresses-Coverity-ID: 1357430 ("Missing break in switch")
Addresses-Coverity-ID: 115047 ("Missing break in switch")
Addresses-Coverity-ID: 115050 ("Missing break in switch")
Addresses-Coverity-ID: 115051 ("Missing break in switch")
Addresses-Coverity-ID: 1467806 ("Missing break in switch")
Addresses-Coverity-ID: 1467807 ("Missing break in switch")
Addresses-Coverity-ID: 1467811 ("Missing break in switch")
Addresses-Coverity-ID: 115041 ("Missing break in switch")
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index ca08c83168f5..06277408477b 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -498,7 +498,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
 			afs_extract_to_tmp(call);
 		}
 
-		/* extract the returned data length */
+		/* Fall through - and extract the returned data length */
 	case 1:
 		_debug("extract data length");
 		ret = afs_extract_data(call, true);
@@ -525,7 +525,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
 		iov_iter_bvec(&call->iter, READ, call->bvec, 1, size);
 		ASSERTCMP(size, <=, PAGE_SIZE);
 
-		/* extract the returned data */
+		/* Fall through - and extract the returned data */
 	case 2:
 		_debug("extract data %zu/%llu",
 		       iov_iter_count(&call->iter), req->remain);
@@ -552,6 +552,8 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
 		/* Discard any excess data the server gave us */
 		iov_iter_discard(&call->iter, READ, req->actual_len - req->len);
 		call->unmarshall = 3;
+
+		/* Fall through */
 	case 3:
 		_debug("extract discard %zu/%llu",
 		       iov_iter_count(&call->iter), req->actual_len - req->len);
@@ -564,7 +566,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
 		call->unmarshall = 4;
 		afs_extract_to_buf(call, (21 + 3 + 6) * 4);
 
-		/* extract the metadata */
+		/* Fall through - and extract the metadata */
 	case 4:
 		ret = afs_extract_data(call, false);
 		if (ret < 0)
@@ -1634,7 +1636,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		call->unmarshall++;
 		afs_extract_to_buf(call, 12 * 4);
 
-		/* extract the returned status record */
+		/* Fall through - and extract the returned status record */
 	case 1:
 		_debug("extract status");
 		ret = afs_extract_data(call, true);
@@ -1646,7 +1648,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		call->unmarshall++;
 		afs_extract_to_tmp(call);
 
-		/* extract the volume name length */
+		/* Fall through - and extract the volume name length */
 	case 2:
 		ret = afs_extract_data(call, true);
 		if (ret < 0)
@@ -1661,7 +1663,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		afs_extract_begin(call, call->reply[2], size);
 		call->unmarshall++;
 
-		/* extract the volume name */
+		/* Fall through - and extract the volume name */
 	case 3:
 		_debug("extract volname");
 		ret = afs_extract_data(call, true);
@@ -1674,7 +1676,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		afs_extract_to_tmp(call);
 		call->unmarshall++;
 
-		/* extract the offline message length */
+		/* Fall through - and extract the offline message length */
 	case 4:
 		ret = afs_extract_data(call, true);
 		if (ret < 0)
@@ -1689,7 +1691,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		afs_extract_begin(call, call->reply[2], size);
 		call->unmarshall++;
 
-		/* extract the offline message */
+		/* Fall through - and extract the offline message */
 	case 5:
 		_debug("extract offline");
 		ret = afs_extract_data(call, true);
@@ -1703,7 +1705,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		afs_extract_to_tmp(call);
 		call->unmarshall++;
 
-		/* extract the message of the day length */
+		/* Fall through - and extract the message of the day length */
 	case 6:
 		ret = afs_extract_data(call, true);
 		if (ret < 0)
@@ -1718,7 +1720,7 @@ static int afs_deliver_fs_get_volume_status(struct afs_call *call)
 		afs_extract_begin(call, call->reply[2], size);
 		call->unmarshall++;
 
-		/* extract the message of the day */
+		/* Fall through - and extract the message of the day */
 	case 7:
 		_debug("extract motd");
 		ret = afs_extract_data(call, false);
@@ -2016,7 +2018,7 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call)
 		afs_extract_to_tmp(call);
 		call->unmarshall++;
 
-		/* Extract the capabilities word count */
+		/* Fall through - and extract the capabilities word count */
 	case 1:
 		ret = afs_extract_data(call, true);
 		if (ret < 0)
@@ -2029,7 +2031,7 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call)
 		iov_iter_discard(&call->iter, READ, count * sizeof(__be32));
 		call->unmarshall++;
 
-		/* Extract capabilities words */
+		/* Fall through - and extract capabilities words */
 	case 2:
 		ret = afs_extract_data(call, false);
 		if (ret < 0)
@@ -2206,6 +2208,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
 		call->unmarshall++;
 
 		/* Extract the file status count and array in two steps */
+		/* Fall through */
 	case 1:
 		_debug("extract status count");
 		ret = afs_extract_data(call, true);
@@ -2223,6 +2226,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
 	more_counts:
 		afs_extract_to_buf(call, 21 * sizeof(__be32));
 
+		/* Fall through */
 	case 2:
 		_debug("extract status array %u", call->count);
 		ret = afs_extract_data(call, true);
@@ -2246,6 +2250,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
 		afs_extract_to_tmp(call);
 
 		/* Extract the callback count and array in two steps */
+		/* Fall through */
 	case 3:
 		_debug("extract CB count");
 		ret = afs_extract_data(call, true);
@@ -2262,6 +2267,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
 	more_cbs:
 		afs_extract_to_buf(call, 3 * sizeof(__be32));
 
+		/* Fall through */
 	case 4:
 		_debug("extract CB array");
 		ret = afs_extract_data(call, true);
@@ -2284,6 +2290,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)
 		afs_extract_to_buf(call, 6 * sizeof(__be32));
 		call->unmarshall++;
 
+		/* Fall through */
 	case 5:
 		ret = afs_extract_data(call, false);
 		if (ret < 0)