nbd: rename read_sync and friends

Rename
  nbd_wr_syncv -> nbd_rwv
  read_sync -> nbd_read
  read_sync_eof -> nbd_read_eof
  write_sync -> nbd_write
  drop_sync -> nbd_drop

1. nbd_ prefix
   read_sync and write_sync are already shared, so it is good to have a
   namespace prefix. drop_sync will be shared, and read_sync_eof is
   related to read_sync, so let's rename them all.

2. _sync suffix
   _sync is related to the fact that nbd_wr_syncv doesn't return if a
   write to socket returns EAGAIN. The first implementation of
   nbd_wr_syncv (was wr_sync in 7a5ca8648b) just loops while getting
   EAGAIN, the current implementation yields in this case.
   Why we want to get rid of it:
   - it is normal for r/w functions to be synchronous, so having an
     additional suffix for it looks redundant (contrariwise, we have
     _aio suffix for async functions)
   - _sync suffix in block layer is used when function does flush (so
     using it for other thing is confusing a bit)
   - keep function names short after adding nbd_ prefix

3. for nbd_wr_syncv let's use more common notation 'rw'

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20170602150150.258222-2-vsementsov@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 21 insertions, 21 deletions

diff --git a/nbd/client.c b/nbd/client.c
index 595d99ed30..17ac85ff57 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -88,7 +88,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
 
 /* Discard length bytes from channel.  Return -errno on failure and 0 on
  * success*/
-static int drop_sync(QIOChannel *ioc, size_t size, Error **errp)
+static int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
 {
     ssize_t ret = 0;
     char small[1024];
@@ -97,7 +97,7 @@ static int drop_sync(QIOChannel *ioc, size_t size, Error **errp)
     buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
     while (size > 0) {
         ssize_t count = MIN(65536, size);
-        ret = read_sync(ioc, buffer, MIN(65536, size), errp);
+        ret = nbd_read(ioc, buffer, MIN(65536, size), errp);
 
         if (ret < 0) {
             goto cleanup;
@@ -135,12 +135,12 @@ static int nbd_send_option_request(QIOChannel *ioc, uint32_t opt,
     stl_be_p(&req.option, opt);
     stl_be_p(&req.length, len);
 
-    if (write_sync(ioc, &req, sizeof(req), errp) < 0) {
+    if (nbd_write(ioc, &req, sizeof(req), errp) < 0) {
         error_prepend(errp, "Failed to send option request header");
         return -1;
     }
 
-    if (len && write_sync(ioc, (char *) data, len, errp) < 0) {
+    if (len && nbd_write(ioc, (char *) data, len, errp) < 0) {
         error_prepend(errp, "Failed to send option request data");
         return -1;
     }
@@ -169,7 +169,7 @@ static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt,
                                     nbd_opt_reply *reply, Error **errp)
 {
     QEMU_BUILD_BUG_ON(sizeof(*reply) != 20);
-    if (read_sync(ioc, reply, sizeof(*reply), errp) < 0) {
+    if (nbd_read(ioc, reply, sizeof(*reply), errp) < 0) {
         error_prepend(errp, "failed to read option reply");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -218,7 +218,7 @@ static int nbd_handle_reply_err(QIOChannel *ioc, nbd_opt_reply *reply,
             goto cleanup;
         }
         msg = g_malloc(reply->length + 1);
-        if (read_sync(ioc, msg, reply->length, errp) < 0) {
+        if (nbd_read(ioc, msg, reply->length, errp) < 0) {
             error_prepend(errp, "failed to read option error message");
             goto cleanup;
         }
@@ -320,7 +320,7 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
         nbd_send_opt_abort(ioc);
         return -1;
     }
-    if (read_sync(ioc, &namelen, sizeof(namelen), errp) < 0) {
+    if (nbd_read(ioc, &namelen, sizeof(namelen), errp) < 0) {
         error_prepend(errp, "failed to read option name length");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -333,7 +333,7 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
         return -1;
     }
     if (namelen != strlen(want)) {
-        if (drop_sync(ioc, len, errp) < 0) {
+        if (nbd_drop(ioc, len, errp) < 0) {
             error_prepend(errp, "failed to skip export name with wrong length");
             nbd_send_opt_abort(ioc);
             return -1;
@@ -342,14 +342,14 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
     }
 
     assert(namelen < sizeof(name));
-    if (read_sync(ioc, name, namelen, errp) < 0) {
+    if (nbd_read(ioc, name, namelen, errp) < 0) {
         error_prepend(errp, "failed to read export name");
         nbd_send_opt_abort(ioc);
         return -1;
     }
     name[namelen] = '\0';
     len -= namelen;
-    if (drop_sync(ioc, len, errp) < 0) {
+    if (nbd_drop(ioc, len, errp) < 0) {
         error_prepend(errp, "failed to read export description");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -476,7 +476,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         goto fail;
     }
 
-    if (read_sync(ioc, buf, 8, errp) < 0) {
+    if (nbd_read(ioc, buf, 8, errp) < 0) {
         error_prepend(errp, "Failed to read data");
         goto fail;
     }
@@ -502,7 +502,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         goto fail;
     }
 
-    if (read_sync(ioc, &magic, sizeof(magic), errp) < 0) {
+    if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
         error_prepend(errp, "Failed to read magic");
         goto fail;
     }
@@ -514,7 +514,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         uint16_t globalflags;
         bool fixedNewStyle = false;
 
-        if (read_sync(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
+        if (nbd_read(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
             error_prepend(errp, "Failed to read server flags");
             goto fail;
         }
@@ -532,7 +532,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         }
         /* client requested flags */
         clientflags = cpu_to_be32(clientflags);
-        if (write_sync(ioc, &clientflags, sizeof(clientflags), errp) < 0) {
+        if (nbd_write(ioc, &clientflags, sizeof(clientflags), errp) < 0) {
             error_prepend(errp, "Failed to send clientflags field");
             goto fail;
         }
@@ -570,13 +570,13 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         }
 
         /* Read the response */
-        if (read_sync(ioc, &s, sizeof(s), errp) < 0) {
+        if (nbd_read(ioc, &s, sizeof(s), errp) < 0) {
             error_prepend(errp, "Failed to read export length");
             goto fail;
         }
         *size = be64_to_cpu(s);
 
-        if (read_sync(ioc, flags, sizeof(*flags), errp) < 0) {
+        if (nbd_read(ioc, flags, sizeof(*flags), errp) < 0) {
             error_prepend(errp, "Failed to read export flags");
             goto fail;
         }
@@ -593,14 +593,14 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
             goto fail;
         }
 
-        if (read_sync(ioc, &s, sizeof(s), errp) < 0) {
+        if (nbd_read(ioc, &s, sizeof(s), errp) < 0) {
             error_prepend(errp, "Failed to read export length");
             goto fail;
         }
         *size = be64_to_cpu(s);
         TRACE("Size is %" PRIu64, *size);
 
-        if (read_sync(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
+        if (nbd_read(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
             error_prepend(errp, "Failed to read export flags");
             goto fail;
         }
@@ -616,7 +616,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
     }
 
     TRACE("Size is %" PRIu64 ", export flags %" PRIx16, *size, *flags);
-    if (zeroes && drop_sync(ioc, 124, errp) < 0) {
+    if (zeroes && nbd_drop(ioc, 124, errp) < 0) {
         error_prepend(errp, "Failed to read reserved block");
         goto fail;
     }
@@ -759,7 +759,7 @@ ssize_t nbd_send_request(QIOChannel *ioc, NBDRequest *request)
     stq_be_p(buf + 16, request->from);
     stl_be_p(buf + 24, request->len);
 
-    return write_sync(ioc, buf, sizeof(buf), NULL);
+    return nbd_write(ioc, buf, sizeof(buf), NULL);
 }
 
 ssize_t nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
@@ -768,7 +768,7 @@ ssize_t nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
     uint32_t magic;
     ssize_t ret;
 
-    ret = read_sync_eof(ioc, buf, sizeof(buf), errp);
+    ret = nbd_read_eof(ioc, buf, sizeof(buf), errp);
     if (ret <= 0) {
         return ret;
     }