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fix for md component detection changes

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And some fine tuning of when the checks are applied
in "start" mode.
This commit is contained in:
David Teigland 2021-02-08 11:23:42 -06:00
parent df4c50396b
commit 018bba897c
1 changed files with 40 additions and 16 deletions
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40
lib/cache/lvmcache.c vendored
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@ -1056,7 +1056,8 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
struct device *dev;
const char *device_hint;
uint64_t devsize, pvsize;
int do_check;
int do_check_size, do_check_name;
int md_check_start;
/*
* use_full_md_check: if set then no more needs to be done here,
@ -1073,9 +1074,11 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
* function is looking for.
*/
if (!cmd->md_component_detection || cmd->use_full_md_check ||
!strcmp(cmd->md_component_checks, "none") || !strcmp(cmd->md_component_checks, "start"))
!strcmp(cmd->md_component_checks, "none"))
return;
md_check_start = !strcmp(cmd->md_component_checks, "start");
/*
* We want to avoid extra scanning for end-of-device md superblocks
* whenever possible, since it can add up to a lot of extra io if we're
@ -1093,7 +1096,8 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
device_hint = _get_pvsummary_device_hint(dev->pvid);
pvsize = _get_pvsummary_size(dev->pvid);
devsize = dev->size;
do_check = 0;
do_check_size = 0;
do_check_name = 0;
if (!devsize && !dev_get_size(dev, &devsize))
log_debug("No size for %s.", dev_name(dev));
@ -1103,11 +1107,32 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
* can be common, but not as often as PV larger.
*/
if (pvsize && devsize && (pvsize != devsize))
do_check = 1;
else if (device_hint && !strcmp(device_hint, "/dev/md"))
do_check = 1;
do_check_size = 1;
if (device_hint && !strncmp(device_hint, "/dev/md", 7))
do_check_name = 1;
if (!do_check_size && !do_check_name)
continue;
/*
* If only the size is different (which can be fairly
* common for non-md-component devs) and the user has
* set "start" to disable full md checks, then skip it.
* If the size is different, *and* the device name hint
* looks like an md device, then it seems very likely
* to be an md component, so do a full check on it even
* if the user has set "start".
*
* In "auto" mode, do a full check if either the size
* or the name indicates a possible md component.
*/
if (do_check_size && !do_check_name && md_check_start) {
log_debug("extra md component check skip %llu %llu device_hint %s dev %s",
(unsigned long long)pvsize, (unsigned long long)devsize,
device_hint ?: "none", dev_name(dev));
continue;
}
if (do_check) {
log_debug("extra md component check %llu %llu device_hint %s dev %s",
(unsigned long long)pvsize, (unsigned long long)devsize,
device_hint ?: "none", dev_name(dev));
@ -1122,7 +1147,6 @@ void lvmcache_extra_md_component_checks(struct cmd_context *cmd)
}
}
}
}
}
/*