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Introduce zero-metadata command

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Add function *zero_md* in *cas_lib* to handle
new command for zeroing metadata.

Signed-off-by: Slawomir Jankowski <slawomir.jankowski@intel.com>
This commit is contained in:
Slawomir Jankowski 2020-05-25 10:54:53 +02:00
parent 9750883d99
commit fe704f83cf
2 changed files with 52 additions and 0 deletions
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44
casadm/cas_lib.c
View File

@ -2926,3 +2926,47 @@ int check_cache_device(const char *device_path)
return SUCCESS;
}
int zero_md(const char *cache_device){
struct kcas_cache_check_device cmd_info;
char zero_page[4096] = {0};
int fd = 0;
/* check if given cache device exists */
fd = open(cache_device, O_RDONLY);
if (fd < 0) {
cas_printf(LOG_ERR, "Device '%s' not found.\n", cache_device);
return FAILURE;
}
close(fd);
/* don't delete metadata if cache is in use */
if (check_cache_already_added(cache_device) == FAILURE) {
cas_printf(LOG_ERR, "Cache device '%s' is already used as cache. "
"Please stop cache to clear metadata.\n", cache_device);
return FAILURE;
}
/* don't delete metadata if device hasn't got CAS's metadata */
_check_cache_device(cache_device, &cmd_info);
if (!cmd_info.is_cache_device) {
cas_printf(LOG_ERR, "Device '%s' does not contain OpenCAS's metadata.\n", cache_device);
return FAILURE;
}
fd = open(cache_device, O_WRONLY | O_SYNC);
if (fd < 0) {
cas_printf(LOG_ERR, "Error while opening '%s' to purge metadata.\n", cache_device);
return FAILURE;
}
if(write(fd, zero_page, 4096) != 4096) {
close(fd);
cas_printf(LOG_ERR, "Error while wiping out metadata from device '%s'.\n", cache_device);
return FAILURE;
}
close(fd);
cas_printf(LOG_INFO, "OpenCAS's metadata wiped succesfully from device '%s'.\n", cache_device);
return SUCCESS;
}

8
casadm/cas_lib.h
View File

@ -267,6 +267,14 @@ int validate_str_stats_filters(const char* s);
int validate_str_output_format(const char* s);
int validate_str_metadata_mode(const char* s);
/**
* @brief clear metadata
*
* @param[in] cache_device device to which zeroing cache's metadata applies
* @return 0 if succeed, 1 if failed
*/
int zero_md(const char *cache_device);
/**
* @brief calculate flush progress
*