[PATCH] afs: Mark expected switch fall-throughs

From: Gustavo A. R. Silva
Date: Thu Jan 10 2019 - 17:02:51 EST

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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")
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
fs/afs/cmservice.c | 8 ++++++++
fs/afs/file.c | 2 ++
fs/afs/flock.c | 1 +
fs/afs/fsclient.c | 31 +++++++++++++++++++------------
fs/afs/misc.c | 9 +++++++++
fs/afs/rxrpc.c | 1 +
fs/afs/vlclient.c | 18 +++++++++++-------
fs/afs/yfsclient.c | 30 ++++++++++++++++++++----------
8 files changed, 71 insertions(+), 29 deletions(-)

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index 8ee5972893ed..40e09bf547e3 100644
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -285,6 +285,7 @@ static int afs_deliver_cb_callback(struct afs_call *call)
call->unmarshall++;

/* extract the FID array and its count in two steps */
+ /* fall through */
case 1:
_debug("extract FID count");
ret = afs_extract_data(call, true);
@@ -304,6 +305,7 @@ static int afs_deliver_cb_callback(struct afs_call *call)
afs_extract_to_buf(call, call->count * 3 * 4);
call->unmarshall++;

+ /* Fall through */
case 2:
_debug("extract FID array");
ret = afs_extract_data(call, true);
@@ -329,6 +331,7 @@ static int afs_deliver_cb_callback(struct afs_call *call)
call->unmarshall++;

/* extract the callback array and its count in two steps */
+ /* fall through */
case 3:
_debug("extract CB count");
ret = afs_extract_data(call, true);
@@ -344,6 +347,7 @@ static int afs_deliver_cb_callback(struct afs_call *call)
iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4);
call->unmarshall++;

+ /* Fall through */
case 4:
_debug("extract discard %zu/%u",
iov_iter_count(&call->iter), call->count2 * 3 * 4);
@@ -422,6 +426,7 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;

+ /* Fall through */
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, false);
@@ -537,6 +542,7 @@ static int afs_deliver_cb_probe_uuid(struct afs_call *call)
afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;

+ /* Fall through */
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, false);
@@ -673,6 +679,7 @@ static int afs_deliver_yfs_cb_callback(struct afs_call *call)
call->unmarshall++;

/* extract the FID array and its count in two steps */
+ /* Fall through */
case 1:
_debug("extract FID count");
ret = afs_extract_data(call, true);
@@ -692,6 +699,7 @@ static int afs_deliver_yfs_cb_callback(struct afs_call *call)
afs_extract_to_buf(call, size);
call->unmarshall++;

+ /* Fall through */
case 2:
_debug("extract FID array");
ret = afs_extract_data(call, false);
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 323ae9912203..e8d6619890a9 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -300,6 +300,8 @@ int afs_page_filler(void *data, struct page *page)
/* page will not be cached */
case -ENOBUFS:
_debug("cache said ENOBUFS");
+
+ /* fall through */
default:
go_on:
req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *),
diff --git a/fs/afs/flock.c b/fs/afs/flock.c
index 0568fd986821..65e2209fb487 100644
--- a/fs/afs/flock.c
+++ b/fs/afs/flock.c
@@ -303,6 +303,7 @@ void afs_lock_work(struct work_struct *work)
return;
}

+ /* Fall through */
default:
/* Looks like a lock request was withdrawn. */
spin_unlock(&vnode->lock);
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)
diff --git a/fs/afs/misc.c b/fs/afs/misc.c
index bbb1fd51b019..7f2af061ea06 100644
--- a/fs/afs/misc.c
+++ b/fs/afs/misc.c
@@ -131,33 +131,42 @@ void afs_prioritise_error(struct afs_error *e, int error, u32 abort_code)
if (e->error == -ETIMEDOUT ||
e->error == -ETIME)
return;
+ /* Fall through */
case -ETIMEDOUT:
case -ETIME:
if (e->error == -ENOMEM ||
e->error == -ENONET)
return;
+ /* Fall through */
case -ENOMEM:
case -ENONET:
if (e->error == -ERFKILL)
return;
+ /* Fall through */
case -ERFKILL:
if (e->error == -EADDRNOTAVAIL)
return;
+ /* Fall through */
case -EADDRNOTAVAIL:
if (e->error == -ENETUNREACH)
return;
+ /* Fall through */
case -ENETUNREACH:
if (e->error == -EHOSTUNREACH)
return;
+ /* Fall through */
case -EHOSTUNREACH:
if (e->error == -EHOSTDOWN)
return;
+ /* Fall through */
case -EHOSTDOWN:
if (e->error == -ECONNREFUSED)
return;
+ /* Fall through */
case -ECONNREFUSED:
if (e->error == -ECONNRESET)
return;
+ /* Fall through */
case -ECONNRESET: /* Responded, but call expired. */
if (e->responded)
return;
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index a7b44863d502..cb55e438ce7b 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -878,6 +878,7 @@ void afs_send_empty_reply(struct afs_call *call)
_debug("oom");
rxrpc_kernel_abort_call(net->socket, call->rxcall,
RX_USER_ABORT, -ENOMEM, "KOO");
+ /* Fall through */
default:
_leave(" [error]");
return;
diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c
index c3d9e5a5f67e..b0175b3ef0e8 100644
--- a/fs/afs/vlclient.c
+++ b/fs/afs/vlclient.c
@@ -195,7 +195,9 @@ static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32));
call->unmarshall++;

- /* Extract the returned uuid, uniquifier, nentries and blkaddrs size */
+ /* Extract the returned uuid, uniquifier, nentries and
+ * blkaddrs size */
+ /* Fall through */
case 1:
ret = afs_extract_data(call, true);
if (ret < 0)
@@ -220,7 +222,7 @@ static int afs_deliver_vl_get_addrs_u(struct afs_call *call)
count = min(call->count, 4U);
afs_extract_to_buf(call, count * sizeof(__be32));

- /* Extract entries */
+ /* Fall through - and extract entries */
case 2:
ret = afs_extract_data(call, call->count > 4);
if (ret < 0)
@@ -323,7 +325,7 @@ static int afs_deliver_vl_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)
@@ -336,7 +338,7 @@ static int afs_deliver_vl_get_capabilities(struct afs_call *call)
call->unmarshall++;
afs_extract_discard(call, count * sizeof(__be32));

- /* Extract capabilities words */
+ /* Fall through - and extract capabilities words */
case 2:
ret = afs_extract_data(call, false);
if (ret < 0)
@@ -436,6 +438,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
/* Extract the returned uuid, uniquifier, fsEndpoints count and
* either the first fsEndpoint type or the volEndpoints
* count if there are no fsEndpoints. */
+ /* Fall through */
case 1:
ret = afs_extract_data(call, true);
if (ret < 0)
@@ -476,7 +479,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
afs_extract_to_buf(call, size);
call->unmarshall = 2;

- /* Extract fsEndpoints[] entries */
+ /* Fall through - and extract fsEndpoints[] entries */
case 2:
ret = afs_extract_data(call, true);
if (ret < 0)
@@ -529,6 +532,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
* extract the type of the next endpoint when we extract the
* data of the current one, but this is the first...
*/
+ /* Fall through */
case 3:
ret = afs_extract_data(call, true);
if (ret < 0)
@@ -555,7 +559,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
afs_extract_to_buf(call, size);
call->unmarshall = 4;

- /* Extract volEndpoints[] entries */
+ /* Fall through - and extract volEndpoints[] entries */
case 4:
ret = afs_extract_data(call, true);
if (ret < 0)
@@ -591,7 +595,7 @@ static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call)
afs_extract_discard(call, 0);
call->unmarshall = 5;

- /* Done */
+ /* Fall through - Done */
case 5:
ret = afs_extract_data(call, false);
if (ret < 0)
diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index 12658c1363ae..234b57982801 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -544,7 +544,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
afs_extract_to_tmp64(call);
call->unmarshall++;

- /* 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);
@@ -571,7 +571,7 @@ static int yfs_deliver_fs_fetch_data64(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);
@@ -598,6 +598,8 @@ static int yfs_deliver_fs_fetch_data64(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);
@@ -613,7 +615,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
sizeof(struct yfs_xdr_YFSCallBack) +
sizeof(struct yfs_xdr_YFSVolSync));

- /* extract the metadata */
+ /* Fall through - and extract the metadata */
case 4:
ret = afs_extract_data(call, false);
if (ret < 0)
@@ -629,6 +631,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)

call->unmarshall++;

+ /* Fall through */
case 5:
break;
}
@@ -1584,7 +1587,7 @@ static int yfs_deliver_fs_get_volume_status(struct afs_call *call)
call->unmarshall++;
afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSFetchVolumeStatus));

- /* extract the returned status record */
+ /* Fall through - and extract the returned status record */
case 1:
_debug("extract status");
ret = afs_extract_data(call, true);
@@ -1596,7 +1599,7 @@ static int yfs_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)
@@ -1611,7 +1614,7 @@ static int yfs_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);
@@ -1624,7 +1627,7 @@ static int yfs_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)
@@ -1639,7 +1642,7 @@ static int yfs_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);
@@ -1653,7 +1656,7 @@ static int yfs_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)
@@ -1668,7 +1671,7 @@ static int yfs_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);
@@ -1681,6 +1684,7 @@ static int yfs_deliver_fs_get_volume_status(struct afs_call *call)

call->unmarshall++;

+ /* Fall through */
case 8:
break;
}
@@ -2026,6 +2030,7 @@ static int yfs_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);
@@ -2043,6 +2048,7 @@ static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)
more_counts:
afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSFetchStatus));

+ /* Fall through */
case 2:
_debug("extract status array %u", call->count);
ret = afs_extract_data(call, true);
@@ -2066,6 +2072,7 @@ static int yfs_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);
@@ -2082,6 +2089,7 @@ static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)
more_cbs:
afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSCallBack));

+ /* Fall through */
case 4:
_debug("extract CB array");
ret = afs_extract_data(call, true);
@@ -2104,6 +2112,7 @@ static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)
afs_extract_to_buf(call, sizeof(struct yfs_xdr_YFSVolSync));
call->unmarshall++;

+ /* Fall through */
case 5:
ret = afs_extract_data(call, false);
if (ret < 0)
@@ -2114,6 +2123,7 @@ static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)

call->unmarshall++;

+ /* Fall through */
case 6:
break;
}
--
2.20.1

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