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Add force option to zero-metadata

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Force option is used to enforce metadata erasure despite
dirty data, metadata mistmatch and/or dirty shutdown.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2021-01-21 15:30:26 -06:00
parent 68b68db9c0
commit 4c98949cac
3 changed files with 43 additions and 5 deletions
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34
casadm/cas_lib.c
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@@ -2909,7 +2909,8 @@ int check_cache_device(const char *device_path)
return SUCCESS;
}
int zero_md(const char *cache_device){
int zero_md(const char *cache_device, bool force)
{
struct kcas_cache_check_device cmd_info = {};
char zero_page[4096] = {0};
int fd = 0;
@@ -2937,6 +2938,37 @@ int zero_md(const char *cache_device){
return FAILURE;
}
if (!cmd_info.metadata_compatible) {
if (!force) {
cas_printf(LOG_ERR, "Unable to determine whether cache contains dirty data due to metadata mismatch.\n"
"Clearing metadata might result in loss of dirty data. In order to inspect cache content\n"
"please load cache instance using matching OpenCAS version. Alternatively, if you wish to clear\n"
"metadata anyway, please use '--force' option.\n");
return FAILURE;
} else {
cas_printf(LOG_WARNING, "Clearing metadata with unknown version - potential loss of dirty data.\n");
}
} else if (!cmd_info.clean_shutdown) {
if (!force) {
cas_printf(LOG_ERR, "Cache instance did not shut down cleanly. It might contain dirty data. \n"
"Clearing metadata might result in loss of dirty data. Please recover cache instance\n"
"by loading it and flush dirty data in order to preserve then on the core device.\n"
"Alternatively, if you wish to clear metadata anyway, please use '--force' option. \n");
return FAILURE;
} else {
cas_printf(LOG_WARNING, "Clearing metadata after dirty shutdown - potential loss of dirty data.\n");
}
} else if (cmd_info.cache_dirty) {
if (!force) {
cas_printf(LOG_ERR, "Cache instance contains dirty data. Clearing metadata will result in loss of dirty data.\n"
"Please load cache instance and flush dirty data in order to preserve them on the core device.\n"
"Alternatively, if you wish to clear metadata anyway, please use '--force' option. \n");
return FAILURE;
} else {
cas_printf(LOG_WARNING, "Clearing metadata for dirty pages - dirty cache data is being discarded. \n");
}
}
fd = open(cache_device, O_WRONLY | O_SYNC | O_EXCL);
if (fd < 0) {
cas_printf(LOG_ERR, "Error while opening '%s'exclusively. This can be due to\n"