1nbd_aio_block_status(3)             LIBNBD             nbd_aio_block_status(3)
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3
4

NAME

6       nbd_aio_block_status - send block status command to the NBD server
7

SYNOPSIS

9        #include <libnbd.h>
10
11        typedef struct {
12          int (*callback) (void *user_data,
13                           const char *metacontext,
14                           uint64_t offset, uint32_t *entries,
15                           size_t nr_entries, int *error);
16          void *user_data;
17          void (*free) (void *user_data);
18        } nbd_extent_callback;
19
20        typedef struct {
21          int (*callback) (void *user_data, int *error);
22          void *user_data;
23          void (*free) (void *user_data);
24        } nbd_completion_callback;
25
26        int64_t nbd_aio_block_status (struct nbd_handle *h,
27                                      uint64_t count,
28                                      uint64_t offset,
29                                      nbd_extent_callback extent_callback,
30                                      nbd_completion_callback completion_callback,
31                                      uint32_t flags);
32

DESCRIPTION

34       Send the block status command to the NBD server.
35
36       To check if the command completed, call nbd_aio_command_completed(3).
37       Or supply the optional "completion_callback" which will be invoked as
38       described in "Completion callbacks" in libnbd(3).
39
40       Other parameters behave as documented in nbd_block_status(3).
41

RETURN VALUE

43       This call returns the 64 bit cookie of the command.  The cookie is ≥ 1.
44       Cookies are unique (per libnbd handle, not globally).
45

ERRORS

47       On error "-1" is returned.
48
49       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
50       of the error.
51

HANDLE STATE

53       The handle must be connected and finished handshaking with the server,
54       otherwise this call will return an error.
55

VERSION

57       This function first appeared in libnbd 1.0.
58
59       If you need to test if this function is available at compile time check
60       if the following macro is defined:
61
62        #define LIBNBD_HAVE_NBD_AIO_BLOCK_STATUS 1
63

SEE ALSO

65       nbd_aio_command_completed(3), nbd_block_status(3),
66       nbd_can_meta_context(3), nbd_create(3), "Issuing asynchronous commands"
67       in libnbd(3), libnbd(3).
68

AUTHORS

70       Eric Blake
71
72       Richard W.M. Jones
73

75       Copyright (C) 2019 Red Hat Inc.
76

LICENSE

78       This library is free software; you can redistribute it and/or modify it
79       under the terms of the GNU Lesser General Public License as published
80       by the Free Software Foundation; either version 2 of the License, or
81       (at your option) any later version.
82
83       This library is distributed in the hope that it will be useful, but
84       WITHOUT ANY WARRANTY; without even the implied warranty of
85       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
86       Lesser General Public License for more details.
87
88       You should have received a copy of the GNU Lesser General Public
89       License along with this library; if not, write to the Free Software
90       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
91       02110-1301 USA
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95libnbd-1.3.7                      2020-04-23           nbd_aio_block_status(3)
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