[Libguestfs] [PATCH nbdkit 2/3] server: Rename ‘struct b_conn_handle’ to plain ‘struct handle’.
Richard W.M. Jones
rjones at redhat.com
Wed Feb 12 13:40:06 UTC 2020
Also add an inline accessor function (get_handle).
This also removes the unused function connection_get_handle.
---
server/internal.h | 24 ++++++++++++++++-----
server/backend.c | 50 ++++++++++++++++++++++----------------------
server/connections.c | 11 +---------
3 files changed, 45 insertions(+), 40 deletions(-)
diff --git a/server/internal.h b/server/internal.h
index c3622671..9d314bf8 100644
--- a/server/internal.h
+++ b/server/internal.h
@@ -170,16 +170,24 @@ typedef int (*connection_send_function) (const void *buf, size_t len,
__attribute__((__nonnull__ (1)));
typedef void (*connection_close_function) (void);
+/* struct handle stores data per connection and backend. Primarily
+ * this is the filter or plugin handle, but other state is also stored
+ * here.
+ *
+ * Use get_handle (conn, 0) to return the struct handle for the
+ * plugin, and get_handle (conn, b->i) to return the struct handle for
+ * the i'th backend (if b->i >= 1 then for a filter).
+ */
enum {
HANDLE_OPEN = 1, /* Set if .open passed, so .close is needed */
HANDLE_CONNECTED = 2, /* Set if .prepare passed, so .finalize is needed */
HANDLE_FAILED = 4, /* Set if .finalize failed */
};
-struct b_conn_handle {
- void *handle;
+struct handle {
+ void *handle; /* Plugin or filter handle. */
- unsigned char state; /* Bitmask of HANDLE_* values */
+ unsigned char state; /* Bitmask of HANDLE_* values */
uint64_t exportsize;
int can_write;
@@ -195,7 +203,7 @@ struct b_conn_handle {
};
static inline void
-reset_b_conn_handle (struct b_conn_handle *h)
+reset_handle (struct handle *h)
{
h->handle = NULL;
h->state = 0;
@@ -222,7 +230,7 @@ struct connection {
void *crypto_session;
int nworkers;
- struct b_conn_handle *handles;
+ struct handle *handles; /* One per plugin and filter. */
size_t nr_handles;
char exportname[NBD_MAX_STRING + 1];
@@ -239,6 +247,12 @@ struct connection {
connection_close_function close;
};
+static inline struct handle *
+get_handle (struct connection *conn, int i)
+{
+ return &conn->handles[i];
+}
+
extern void handle_single_connection (int sockin, int sockout);
extern int connection_get_status (void);
extern int connection_set_status (int value);
diff --git a/server/backend.c b/server/backend.c
index 616c24d8..9669ada1 100644
--- a/server/backend.c
+++ b/server/backend.c
@@ -154,7 +154,7 @@ int
backend_open (struct backend *b, int readonly)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: open readonly=%d", b->name, readonly);
@@ -178,7 +178,7 @@ backend_open (struct backend *b, int readonly)
h->state |= HANDLE_OPEN;
if (b->i) /* A filter must not succeed unless its backend did also */
- assert (conn->handles[b->i - 1].handle);
+ assert (get_handle (conn, b->i-1)->handle != NULL);
return 0;
}
@@ -186,7 +186,7 @@ int
backend_prepare (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
assert (h->handle);
assert ((h->state & (HANDLE_OPEN | HANDLE_CONNECTED)) == HANDLE_OPEN);
@@ -209,7 +209,7 @@ int
backend_finalize (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
/* Call these in reverse order to .prepare above, starting from the
* filter furthest away from the plugin, and matching .close order.
@@ -238,7 +238,7 @@ void
backend_close (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
/* outer-to-inner order, opposite .open */
controlpath_debug ("%s: close", b->name);
@@ -249,7 +249,7 @@ backend_close (struct backend *b)
}
else
assert (! (h->state & HANDLE_OPEN));
- reset_b_conn_handle (h);
+ reset_handle (h);
if (b->i)
backend_close (b->next);
}
@@ -258,7 +258,7 @@ bool
backend_valid_range (struct backend *b, uint64_t offset, uint32_t count)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
assert (h->exportsize <= INT64_MAX); /* Guaranteed by negotiation phase */
return count > 0 && offset <= h->exportsize &&
@@ -291,7 +291,7 @@ int64_t
backend_get_size (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: get_size", b->name);
@@ -305,7 +305,7 @@ int
backend_can_write (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: can_write", b->name);
@@ -319,7 +319,7 @@ int
backend_can_flush (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: can_flush", b->name);
@@ -333,7 +333,7 @@ int
backend_is_rotational (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: is_rotational", b->name);
@@ -347,7 +347,7 @@ int
backend_can_trim (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
controlpath_debug ("%s: can_trim", b->name);
@@ -368,7 +368,7 @@ int
backend_can_zero (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
controlpath_debug ("%s: can_zero", b->name);
@@ -389,7 +389,7 @@ int
backend_can_fast_zero (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
controlpath_debug ("%s: can_fast_zero", b->name);
@@ -410,7 +410,7 @@ int
backend_can_extents (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: can_extents", b->name);
@@ -424,7 +424,7 @@ int
backend_can_fua (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
controlpath_debug ("%s: can_fua", b->name);
@@ -445,7 +445,7 @@ int
backend_can_multi_conn (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
assert (h->handle && (h->state & HANDLE_CONNECTED));
controlpath_debug ("%s: can_multi_conn", b->name);
@@ -459,7 +459,7 @@ int
backend_can_cache (struct backend *b)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
controlpath_debug ("%s: can_cache", b->name);
@@ -475,7 +475,7 @@ backend_pread (struct backend *b,
uint32_t flags, int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
assert (h->handle && (h->state & HANDLE_CONNECTED));
@@ -496,7 +496,7 @@ backend_pwrite (struct backend *b,
uint32_t flags, int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
bool fua = !!(flags & NBDKIT_FLAG_FUA);
int r;
@@ -520,7 +520,7 @@ backend_flush (struct backend *b,
uint32_t flags, int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
assert (h->handle && (h->state & HANDLE_CONNECTED));
@@ -540,7 +540,7 @@ backend_trim (struct backend *b,
int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
bool fua = !!(flags & NBDKIT_FLAG_FUA);
int r;
@@ -566,7 +566,7 @@ backend_zero (struct backend *b,
int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
bool fua = !!(flags & NBDKIT_FLAG_FUA);
bool fast = !!(flags & NBDKIT_FLAG_FAST_ZERO);
int r;
@@ -601,7 +601,7 @@ backend_extents (struct backend *b,
struct nbdkit_extents *extents, int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
assert (h->handle && (h->state & HANDLE_CONNECTED));
@@ -632,7 +632,7 @@ backend_cache (struct backend *b,
uint32_t flags, int *err)
{
GET_CONN;
- struct b_conn_handle *h = &conn->handles[b->i];
+ struct handle *h = get_handle (conn, b->i);
int r;
assert (h->handle && (h->state & HANDLE_CONNECTED));
diff --git a/server/connections.c b/server/connections.c
index 7e9584b3..d4cdf994 100644
--- a/server/connections.c
+++ b/server/connections.c
@@ -58,15 +58,6 @@ static int raw_send_socket (const void *buf, size_t len, int flags);
static int raw_send_other (const void *buf, size_t len, int flags);
static void raw_close (void);
-void *
-connection_get_handle (size_t i)
-{
- GET_CONN;
-
- assert (i < conn->nr_handles);
- return conn->handles[i].handle;
-}
-
int
connection_get_status (void)
{
@@ -258,7 +249,7 @@ new_connection (int sockin, int sockout, int nworkers)
}
conn->nr_handles = top->i + 1;
for_each_backend (b)
- reset_b_conn_handle (&conn->handles[b->i]);
+ reset_handle (get_handle (conn, b->i));
conn->status = 1;
conn->nworkers = nworkers;
--
2.25.0
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