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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 <stdbool.h> /* for bool, true, false */
#include <stdio.h> /* for printf(3p), fprintf(3p), sprintf(3p), stderr */
#include <stdlib.h> /* malloc(3p), freep(3p), exit(3p), EXIT_SUCCESS, EXIT_FAILURE */
#include <string.h> /* for strcmp(3p), strlen(3p), strcpy(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)
struct flag {
char *name;
uint32_t value;
bool active;
};
int print_extent(struct fiemap_extent extent) {
struct flag known_flags[] = {
{"LAST", FIEMAP_EXTENT_LAST, false},
{"UNKNOWN", FIEMAP_EXTENT_UNKNOWN, false},
{"DELALLOC", FIEMAP_EXTENT_DELALLOC, false},
{"ENCODED", FIEMAP_EXTENT_ENCODED, false},
{"DATA_ENCRYPTED", FIEMAP_EXTENT_DATA_ENCRYPTED, false},
{"NOT_ALIGNED", FIEMAP_EXTENT_NOT_ALIGNED, false},
{"DATA_INLINE", FIEMAP_EXTENT_DATA_INLINE, false},
{"DATA_TAIL", FIEMAP_EXTENT_DATA_TAIL, false},
{"UNWRITTEN", FIEMAP_EXTENT_UNWRITTEN, false},
{"MERGED", FIEMAP_EXTENT_MERGED, false},
{"SHARED", FIEMAP_EXTENT_SHARED, false},
};
uint32_t flags = extent.fe_flags;
size_t flagstr_cap = 0;
for (size_t i = 0; i < sizeof(known_flags)/sizeof(known_flags[0]); i++) {
if (!(flags & known_flags[i].value))
continue;
known_flags[i].active = true;
flags ^= known_flags[i].value;
switch (known_flags[i].value) {
case FIEMAP_EXTENT_UNKNOWN:
if (flags & FIEMAP_EXTENT_DELALLOC) {
known_flags[i].name = "(UNKNOWN|DELALLOC)";
flags ^= FIEMAP_EXTENT_DELALLOC;
}
break;
case FIEMAP_EXTENT_ENCODED:
if (flags & FIEMAP_EXTENT_DATA_ENCRYPTED) {
known_flags[i].name = "(ENCODED|DATA_ENCRYPTED)";
flags ^= FIEMAP_EXTENT_DATA_ENCRYPTED;
}
break;
case FIEMAP_EXTENT_NOT_ALIGNED:
switch (flags & (FIEMAP_EXTENT_DATA_INLINE|FIEMAP_EXTENT_DATA_TAIL)) {
case FIEMAP_EXTENT_DATA_INLINE:
known_flags[i].name = "(NOT_ALIGNED|DATA_INLINE)";
flags ^= FIEMAP_EXTENT_DATA_INLINE;
break;
case FIEMAP_EXTENT_DATA_TAIL:
known_flags[i].name = "(NOT_ALIGNED|DATA_TAIL)";
flags ^= FIEMAP_EXTENT_DATA_TAIL;
break;
case FIEMAP_EXTENT_DATA_INLINE|FIEMAP_EXTENT_DATA_TAIL:
known_flags[i].name = "(NOT_ALIGNED|DATA_INLINE|DATA_TAIL)";
flags ^= FIEMAP_EXTENT_DATA_INLINE|FIEMAP_EXTENT_DATA_TAIL;
break;
}
break;
}
if (flagstr_cap)
flagstr_cap++;
flagstr_cap += strlen(known_flags[i].name);
}
if (flags)
flagstr_cap += (flagstr_cap ? 1 : 0) + 10;
char *flagstr = malloc(flagstr_cap+1);
if (!flagstr)
error(EXIT_FAILURE, errno, "malloc");
size_t flagstr_len = 0;
for (size_t i = 0; i < sizeof(known_flags)/sizeof(known_flags[0]); i++) {
if (!known_flags[i].active)
continue;
if (flagstr_len)
flagstr[flagstr_len++] = '|';
strcpy(&flagstr[flagstr_len], known_flags[i].name);
flagstr_len += strlen(known_flags[i].name);
}
if (flags) {
if (flagstr_len)
flagstr[flagstr_len++] = '|';
sprintf(&flagstr[flagstr_len], "0x%08"PRIx32, flags);
};
printf("logical=%"PRIu64" "
"physical=%"PRIu64" "
"length=%"PRIu64" "
"flags=0x%08"PRIx32" (%s)\n",
extent.fe_logical,
extent.fe_physical,
extent.fe_length,
extent.fe_flags,
flagstr);
free(flagstr);
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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