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dmsetup: Produce partial output if dev disappears.

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If a device disappears after obtaining the list of devices but before
processing it as a member of that list, dmsetup exits with a failure code.

Most commands still produce what output they can in these circumstances,
but 'ls --tree' and 'info -c' with fields depending on device dependencies
didn't.  Change this.
This commit is contained in:
Alasdair G Kergon 2016-10-18 18:01:52 +01:00
parent 5c55c4ac18
commit 34da83d729
2 changed files with 37 additions and 17 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.136 -
======================================
Still produce output when dmsetup dependency tree building finds dev missing.
Check and report pthread_sigmask() failure in dmeventd.
Check mem alloc fail in _canonicalize_field_ids().
Use unsigned math when checking more then 31 legs of raid.

53
tools/dmsetup.c
View File

@ -2707,6 +2707,9 @@ static int _add_dep(CMD_ARGS)
/*
* Create and walk dependency tree
*
* An incomplete _dtree may still be used by the caller,
* but the error must be reported.
*/
static int _build_whole_deptree(const struct command *cmd)
{
@ -2724,12 +2727,14 @@ static int _build_whole_deptree(const struct command *cmd)
static int _display_tree(CMD_ARGS)
{
if (!_build_whole_deptree(cmd))
return_0;
int r;
_display_tree_walk_children(dm_tree_find_node(_dtree, 0, 0), 0);
r = _build_whole_deptree(cmd);
return 1;
if (_dtree)
_display_tree_walk_children(dm_tree_find_node(_dtree, 0, 0), 0);
return r;
}
/*
@ -4471,9 +4476,14 @@ static int _report_init(const struct command *cmd, const char *subcommand)
selection, NULL, NULL)))
goto_out;
if ((_report_type & DR_TREE) && cmd && !_build_whole_deptree(cmd)) {
err("Internal device dependency tree creation failed.");
goto out;
r = 1;
if ((_report_type & DR_TREE) && cmd) {
r = _build_whole_deptree(cmd);
if (!_dtree) {
err("Internal device dependency tree creation failed.");
goto out;
}
}
if (!_switches[INTERVAL_ARG])
@ -4484,8 +4494,6 @@ static int _report_init(const struct command *cmd, const char *subcommand)
if (field_prefixes)
dm_report_set_output_field_name_prefix(_report, "dm_");
r = 1;
out:
if (len)
dm_free(options);
@ -6782,8 +6790,15 @@ unknown:
argc--, argv++;
}
if (_switches[COLS_ARG] && !_report_init(cmd, subcommand))
goto_out;
/* Default to success */
ret = 0;
if (_switches[COLS_ARG]) {
if (!_report_init(cmd, subcommand))
ret = 1;
if (!_report)
goto_out;
}
if (_switches[COUNT_ARG])
_count = ((uint32_t)_int_args[COUNT_ARG]) ? : UINT32_MAX;
@ -6795,14 +6810,17 @@ unknown:
&_disp_units);
if (!_disp_factor) {
log_error("Invalid --units argument.");
ret = 1;
goto out;
}
}
/* Start interval timer. */
if (_count > 1)
if (!_start_timer())
if (!_start_timer()) {
ret = 1;
goto_out;
}
doit:
multiple_devices = (cmd->repeatable_cmd && argc != 1 &&
@ -6819,18 +6837,19 @@ doit:
if (_count > 1 && r) {
printf("\n");
/* wait for --interval and update timestamps */
if (!_do_report_wait())
if (!_do_report_wait()) {
ret = 1;
goto_out;
}
}
}
if (!r)
if (!r) {
ret = 1;
goto_out;
}
} while (--_count);
/* Success */
ret = 0;
out:
if (_report)
dm_report_free(_report);