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#define _GNU_SOURCE /* for program_invocation_name */
#include <assert.h> /* for assert(3p) */
#include <errno.h> /* for errno, program_invocation_name */
#include <error.h> /* for error(3gnu) */
#include <fcntl.h> /* for open(2) and O_RDONLY */
#include <getopt.h> /* for getopt_long(3gnu), struct option, optind, optarg */
#include <inttypes.h> /* PRI* */
#include <stdio.h> /* for printf(3p), fprintf(3p), stderr */
#include <stdlib.h> /* exit(3p), EXIT_SUCCESS, EXIT_FAILURE */
#include <string.h> /* for strcmp(3p) */
#include "extent-map.h" /* for uint32_t, fiemap stuff */
#define EXIT_INVALIDARGUMENT 2
#define errusage(format, ...) do { \
error(0, 0, format, ## __VA_ARGS__); \
fprintf(stderr, "Try '%s --help' for more information.\n", program_invocation_name); \
exit(EXIT_INVALIDARGUMENT); \
} while(0)
int print_extent(struct fiemap_extent extent) {
printf("logical=%"PRIu64" "
"physical=%"PRIu64" "
"length=%"PRIu64" "
"flags=0x%"PRIx32"\n",
extent.fe_logical,
extent.fe_physical,
extent.fe_length,
extent.fe_flags);
return 0;
}
void usage() {
printf("Usage: %s [OPTIONS] FILENAME\n"
"Print a file extent map.\n"
"\n"
"OPTIONS:\n"
" --stream=data Map extents in the data stream (default).\n"
" --stream=xattr Map extents in the extended attribute stream.\n"
" --sync Sync the file before mapping extents (default).\n"
" --no-sync Don't sync the file before mapping extents.\n"
" -h, --help Display this help and exit.\n",
program_invocation_name);
}
int main(int argc, char *argv[]) {
char *stream = "data";
int sync = 1;
struct option long_options[] = {
{"stream", optional_argument, NULL, 1},
{"sync", no_argument, &sync, 1},
{"no-sync", no_argument, &sync, 0},
{"help", no_argument, NULL, 'h'},
{0},
};
int flag;
while ((flag = getopt_long(argc, argv, "h", long_options, NULL)) >= 0) {
switch (flag) {
case 0:
break;
case 1:
stream = optarg;
break;
case 'h':
usage();
return EXIT_SUCCESS;
case '?':
fprintf(stderr, "Try '%s --help' for more information.\n", program_invocation_name);
return EXIT_INVALIDARGUMENT;
default:
assert(0);
}
}
if (argc - optind != 1)
errusage("wrong number of arguments");
uint32_t flags = sync ? FIEMAP_FLAG_SYNC : 0;
if (strcmp(stream, "data") == 0) {
/* do nothing */
} else if (strcmp(stream, "xattr") == 0) {
flags |= FIEMAP_FLAG_XATTR;
} else {
errusage("invalid stream name");
}
char *filename = argv[optind];
int fd = open(filename, O_RDONLY);
if (fd < 0)
error(EXIT_FAILURE, errno, "%s", filename);
fiemap(fd, flags, print_extent);
return EXIT_SUCCESS;;
}
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