1nbd_clear_meta_contexts(3)          LIBNBD          nbd_clear_meta_contexts(3)
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NAME

6       nbd_clear_meta_contexts - reset the list of requested meta contexts
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SYNOPSIS

9        #include <libnbd.h>
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11        int nbd_clear_meta_contexts (
12              struct nbd_handle *h
13            );
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DESCRIPTION

16       During connection libnbd can negotiate zero or more metadata contexts
17       with the server.  Metadata contexts are features (such as
18       "base:allocation") which describe information returned by the
19       nbd_block_status_64(3) command (for "base:allocation" this is whether
20       blocks of data are allocated, zero or sparse).
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22       This command resets the list of meta contexts to request back to an
23       empty list, for re-population by further use of
24       nbd_add_meta_context(3).  It is primarily useful when option
25       negotiation mode is selected (see nbd_set_opt_mode(3)), for altering
26       the list of attempted contexts between subsequent export queries.
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RETURN VALUE

29       If the call is successful the function returns 0.
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ERRORS

32       On error -1 is returned.
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34       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
35       of the error.
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37       The following parameters must not be NULL: "h".  For more information
38       see "Non-NULL parameters" in libnbd(3).
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HANDLE STATE

41       The handle must be newly created, or negotiating, otherwise this call
42       will return an error.
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VERSION

45       This function first appeared in libnbd 1.6.
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47       If you need to test if this function is available at compile time check
48       if the following macro is defined:
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50        #define LIBNBD_HAVE_NBD_CLEAR_META_CONTEXTS 1
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SEE ALSO

53       nbd_add_meta_context(3), nbd_block_status_64(3),
54       nbd_can_meta_context(3), nbd_create(3), nbd_get_meta_context(3),
55       nbd_get_nr_meta_contexts(3), nbd_set_opt_mode(3), libnbd(3).
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AUTHORS

58       Eric Blake
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60       Richard W.M. Jones
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63       Copyright Red Hat
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LICENSE

66       This library is free software; you can redistribute it and/or modify it
67       under the terms of the GNU Lesser General Public License as published
68       by the Free Software Foundation; either version 2 of the License, or
69       (at your option) any later version.
70
71       This library is distributed in the hope that it will be useful, but
72       WITHOUT ANY WARRANTY; without even the implied warranty of
73       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
74       Lesser General Public License for more details.
75
76       You should have received a copy of the GNU Lesser General Public
77       License along with this library; if not, write to the Free Software
78       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
79       02110-1301 USA
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83libnbd-1.18.1                     2023-10-31        nbd_clear_meta_contexts(3)
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