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/*
Copyright (c) 2019 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <stdlib.h>
#ifdef __FreeBSD__
#include <sys/endian.h>
#else
#include <endian.h>
#endif
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/xattr.h>
#include <errno.h>
typedef struct gf_timespec_disk {
uint64_t tv_sec;
uint64_t tv_nsec;
} gf_timespec_disk_t;
/* posix_mdata_t on disk structure */
typedef struct __attribute__((__packed__)) posix_mdata_disk {
/* version of structure, bumped up if any new member is added */
uint8_t version;
/* flags indicates valid fields in the structure */
uint64_t flags;
gf_timespec_disk_t ctime;
gf_timespec_disk_t mtime;
gf_timespec_disk_t atime;
} posix_mdata_disk_t;
/* In memory representation posix metadata xattr */
typedef struct {
/* version of structure, bumped up if any new member is added */
uint8_t version;
/* flags indicates valid fields in the structure */
uint64_t flags;
struct timespec ctime;
struct timespec mtime;
struct timespec atime;
} posix_mdata_t;
#define GF_XATTR_MDATA_KEY "trusted.glusterfs.mdata"
/* posix_mdata_from_disk converts posix_mdata_disk_t into host byte order
*/
static inline void
posix_mdata_from_disk(posix_mdata_t *out, posix_mdata_disk_t *in)
{
out->version = in->version;
out->flags = be64toh(in->flags);
out->ctime.tv_sec = be64toh(in->ctime.tv_sec);
out->ctime.tv_nsec = be64toh(in->ctime.tv_nsec);
out->mtime.tv_sec = be64toh(in->mtime.tv_sec);
out->mtime.tv_nsec = be64toh(in->mtime.tv_nsec);
out->atime.tv_sec = be64toh(in->atime.tv_sec);
out->atime.tv_nsec = be64toh(in->atime.tv_nsec);
}
/* posix_fetch_mdata_xattr fetches the posix_mdata_t from disk */
static int
posix_fetch_mdata_xattr(const char *real_path, posix_mdata_t *metadata)
{
ssize_t size = -1;
char *value = NULL;
char gfid_str[64] = {0};
char *key = GF_XATTR_MDATA_KEY;
if (!metadata || !real_path) {
goto err;
}
/* Get size */
size = lgetxattr(real_path, key, NULL, 0);
if (size == -1) {
goto err;
}
value = calloc(size + 1, sizeof(char));
if (!value) {
goto err;
}
/* Get xattr value */
size = lgetxattr(real_path, key, value, size);
if (size == -1) {
goto err;
}
posix_mdata_from_disk(metadata, (posix_mdata_disk_t *)value);
out:
if (value)
free(value);
return 0;
err:
if (value)
free(value);
return -1;
}
int
main(int argc, char *argv[])
{
posix_mdata_t metadata;
uint64_t result;
if (argc != 3) {
/*
Usage: get_mdata_xattr -c|-m|-a <file-name>
where -c --> ctime
-m --> mtime
-a --> atime
*/
printf("-1");
goto err;
}
if (posix_fetch_mdata_xattr(argv[2], &metadata)) {
printf("-1");
goto err;
}
switch (argv[1][1]) {
case 'c':
result = metadata.ctime.tv_sec;
break;
case 'm':
result = metadata.mtime.tv_sec;
break;
case 'a':
result = metadata.atime.tv_sec;
break;
default:
printf("-1");
goto err;
}
printf("%" PRIu64, result);
fflush(stdout);
return 0;
err:
fflush(stdout);
return -1;
}
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