2 * filefrag.c -- report if a particular file is fragmented
4 * Copyright 2003 by Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
19 fputs("This program is only supported on Linux!\n", stderr);
23 #ifndef _LARGEFILE_SOURCE
24 #define _LARGEFILE_SOURCE
26 #ifndef _LARGEFILE64_SOURCE
27 #define _LARGEFILE64_SOURCE
44 #include <sys/types.h>
47 #include <sys/ioctl.h>
48 #ifdef HAVE_LINUX_FD_H
51 #include <ext2fs/ext2fs.h>
52 #include <ext2fs/ext2_types.h>
53 #include <ext2fs/fiemap.h>
56 int blocksize; /* Use specified blocksize (default 1kB) */
57 int sync_file = 0; /* fsync file before getting the mapping */
58 int xattr_map = 0; /* get xattr mapping */
59 int force_bmap; /* force use of FIBMAP instead of FIEMAP */
60 int force_extent; /* print output in extent format always */
61 int device_offset; /* extents report device-relative offsets */
62 int logical_width = 8;
63 int physical_width = 10;
64 const char *ext_fmt = "%4d: %*llu..%*llu: %*llu..%*llu: %6llu: %s\n";
65 const char *hex_fmt = "%4d: %*llx..%*llx: %*llx..%*llx: %6llx: %s\n";
67 #define FILEFRAG_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR |\
68 FIEMAP_FLAG_DEVICE_ORDER)
70 #define FIBMAP _IO(0x00, 1) /* bmap access */
71 #define FIGETBSZ _IO(0x00, 2) /* get the block size used for bmap */
73 #define LUSTRE_SUPER_MAGIC 0x0BD00BD0
75 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
76 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
78 static int int_log2(int arg)
90 static int int_log10(unsigned long long arg)
102 static unsigned int div_ceil(unsigned int a, unsigned int b)
106 return ((a - 1) / b) + 1;
109 static int get_bmap(int fd, unsigned long block, unsigned long *phy_blk)
115 ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes pointer to integer */
123 static void print_extent_header(void)
125 printf(" ext: %*s %*s length: %*s flags:\n",
126 logical_width * 2 + 3,
127 device_offset ? "device_logical:" : "logical_offset:",
128 physical_width * 2 + 3, "physical_offset:",
129 device_offset ? 5 : physical_width + 1,
130 device_offset ? " dev:" : "expected:");
133 static void print_flag(__u32 *flags, __u32 mask, char *buf, const char *name)
135 if ((*flags & mask) == 0)
142 static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
143 unsigned long long expected, int blk_shift,
144 ext2fs_struct_stat *st)
146 unsigned long long physical_blk;
147 unsigned long long logical_blk;
148 unsigned long long ext_len;
149 unsigned long long ext_blks;
150 __u32 fe_flags, mask;
151 char flags[256] = "";
153 /* For inline data all offsets should be in bytes, not blocks */
154 if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
157 ext_len = fm_extent->fe_length >> blk_shift;
158 ext_blks = (fm_extent->fe_length - 1) >> blk_shift;
159 logical_blk = fm_extent->fe_logical >> blk_shift;
160 if (fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN) {
163 physical_blk = fm_extent->fe_physical >> blk_shift;
167 sprintf(flags, "%04x: ", fm_extent->fe_device);
169 sprintf(flags, ext_fmt == hex_fmt ? "%*llx:" : "%*llu: ",
170 physical_width, expected >> blk_shift);
172 fe_flags = fm_extent->fe_flags;
173 print_flag(&fe_flags, FIEMAP_EXTENT_LAST, flags, "last,");
174 print_flag(&fe_flags, FIEMAP_EXTENT_UNKNOWN, flags, "unknown_loc,");
175 print_flag(&fe_flags, FIEMAP_EXTENT_DELALLOC, flags, "delalloc,");
176 print_flag(&fe_flags, FIEMAP_EXTENT_ENCODED, flags, "encoded,");
177 print_flag(&fe_flags, FIEMAP_EXTENT_DATA_ENCRYPTED, flags,"encrypted,");
178 print_flag(&fe_flags, FIEMAP_EXTENT_NOT_ALIGNED, flags, "not_aligned,");
179 print_flag(&fe_flags, FIEMAP_EXTENT_DATA_INLINE, flags, "inline,");
180 print_flag(&fe_flags, FIEMAP_EXTENT_DATA_TAIL, flags, "tail_packed,");
181 print_flag(&fe_flags, FIEMAP_EXTENT_UNWRITTEN, flags, "unwritten,");
182 print_flag(&fe_flags, FIEMAP_EXTENT_MERGED, flags, "merged,");
183 print_flag(&fe_flags, FIEMAP_EXTENT_SHARED, flags, "shared,");
184 print_flag(&fe_flags, FIEMAP_EXTENT_NET, flags, "net,");
186 /* print any unknown flags as hex values */
187 for (mask = 1; fe_flags != 0 && mask != 0; mask <<= 1) {
188 char hex[sizeof(mask) * 2 + 4]; /* 2 chars/byte + 0x, + NUL */
190 if ((fe_flags & mask) == 0)
192 sprintf(hex, "%#04x,", mask);
193 print_flag(&fe_flags, mask, flags, hex);
196 if (fm_extent->fe_logical + fm_extent->fe_length >=
197 (unsigned long long) st->st_size)
198 strcat(flags, "eof,");
200 /* Remove trailing comma, if any */
201 if (flags[0] != '\0')
202 flags[strnlen(flags, sizeof(flags)) - 1] = '\0';
204 printf(ext_fmt, cur_ex, logical_width, logical_blk,
205 logical_width, logical_blk + ext_blks,
206 physical_width, physical_blk,
207 physical_width, physical_blk + ext_blks,
211 static int filefrag_fiemap(int fd, int blk_shift, int *num_extents,
212 ext2fs_struct_stat *st)
214 __u64 buf[2048]; /* __u64 for proper field alignment */
215 struct fiemap *fiemap = (struct fiemap *)buf;
216 struct fiemap_extent *fm_ext = &fiemap->fm_extents[0];
217 struct fiemap_extent fm_last;
218 int count = (sizeof(buf) - sizeof(*fiemap)) /
219 sizeof(struct fiemap_extent);
220 unsigned long long expected = 0;
221 unsigned long long expected_dense = 0;
222 unsigned long flags = 0;
224 int fiemap_header_printed = 0;
225 int tot_extents = 0, n = 0;
226 int previous_device = 0;
230 memset(fiemap, 0, sizeof(struct fiemap));
231 memset(&fm_last, 0, sizeof(fm_last));
234 flags |= FIEMAP_FLAG_SYNC;
237 flags |= FIEMAP_FLAG_XATTR;
240 flags |= FIEMAP_FLAG_DEVICE_ORDER;
241 memset(fm_ext, 0, sizeof(struct fiemap_extent));
244 retry_wo_device_order:
246 fiemap->fm_length = ~0ULL;
247 fiemap->fm_flags = flags;
248 fiemap->fm_extent_count = count;
249 rc = ioctl(fd, FS_IOC_FIEMAP, (unsigned long) fiemap);
251 static int fiemap_incompat_printed;
254 if (rc == -EBADR && !fiemap_incompat_printed) {
255 fprintf(stderr, "FIEMAP failed with unknown "
258 fiemap_incompat_printed = 1;
259 } else if (rc == EBADR && (fiemap->fm_flags &
260 FIEMAP_FLAG_DEVICE_ORDER)) {
261 flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
262 goto retry_wo_device_order;
267 /* If 0 extents are returned, then more ioctls are not needed */
268 if (fiemap->fm_mapped_extents == 0)
271 if (verbose && !fiemap_header_printed) {
272 print_extent_header();
273 fiemap_header_printed = 1;
276 for (i = 0; i < fiemap->fm_mapped_extents; i++) {
277 if (previous_device != fm_ext[i].fe_device)
278 previous_device = fm_ext[i].fe_device;
280 expected_dense = fm_last.fe_physical +
282 expected = fm_last.fe_physical +
283 fm_ext[i].fe_logical - fm_last.fe_logical;
284 if (fm_ext[i].fe_logical != 0 &&
285 fm_ext[i].fe_physical != expected &&
286 fm_ext[i].fe_physical != expected_dense) {
294 print_extent_info(&fm_ext[i], n, expected,
296 if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
302 /* For DEVICE_ORDER mappings, if EXTENT_LAST not yet found then
303 * fm_start needs to be the same as it was for earlier ioctl.
304 * The first extent is used to pass the end offset and device
305 * of the last FIEMAP call. Otherwise, we ask for extents
306 * starting from where the last mapping ended. */
307 if (flags & FIEMAP_FLAG_DEVICE_ORDER) {
308 fm_ext[0].fe_logical = fm_ext[i - 1].fe_logical +
309 fm_ext[i - 1].fe_length;
310 fm_ext[0].fe_device = fm_ext[i - 1].fe_device;
311 fiemap->fm_start = 0;
313 fiemap->fm_start = fm_ext[i - 1].fe_logical +
314 fm_ext[i - 1].fe_length;
318 *num_extents = tot_extents;
323 #define EXT2_DIRECT 12
325 static int filefrag_fibmap(int fd, int blk_shift, int *num_extents,
326 ext2fs_struct_stat *st,
327 unsigned long numblocks, int is_ext2)
329 struct fiemap_extent fm_ext, fm_last;
330 unsigned long i, last_block;
331 unsigned long long logical, expected = 0;
332 /* Blocks per indirect block */
333 const long bpib = st->st_blksize / 4;
336 memset(&fm_ext, 0, sizeof(fm_ext));
337 memset(&fm_last, 0, sizeof(fm_last));
339 fm_ext.fe_device = st->st_dev;
340 fm_ext.fe_flags = FIEMAP_EXTENT_MERGED;
343 if (sync_file && fsync(fd) != 0)
346 for (i = 0, logical = 0, *num_extents = 0, count = last_block = 0;
348 i++, logical += st->st_blksize) {
349 unsigned long block = 0;
352 if (is_ext2 && last_block) {
353 if (((i - EXT2_DIRECT) % bpib) == 0)
355 if (((i - EXT2_DIRECT - bpib) % (bpib * bpib)) == 0)
357 if (((i - EXT2_DIRECT - bpib - bpib * bpib) %
358 (((unsigned long long)bpib) * bpib * bpib)) == 0)
361 rc = get_bmap(fd, i, &block);
367 if (*num_extents == 0 || block != last_block + 1 ||
368 fm_ext.fe_logical + fm_ext.fe_length != logical) {
370 * This is the start of a new extent; figure out where
371 * we expected it to be and report the extent.
373 if (*num_extents != 0 && fm_last.fe_length) {
374 expected = fm_last.fe_physical +
375 (fm_ext.fe_logical - fm_last.fe_logical);
376 if (expected == fm_ext.fe_physical)
379 if (force_extent && *num_extents == 0)
380 print_extent_header();
381 if (force_extent && *num_extents != 0) {
382 print_extent_info(&fm_ext, *num_extents - 1,
383 expected, blk_shift, st);
385 if (verbose && expected != 0) {
386 printf("Discontinuity: Block %llu is at %llu "
388 fm_ext.fe_logical / st->st_blksize,
389 fm_ext.fe_physical / st->st_blksize,
390 expected / st->st_blksize);
392 /* create the new extent */
395 fm_ext.fe_physical = block * st->st_blksize;
396 fm_ext.fe_logical = logical;
397 fm_ext.fe_length = 0;
399 fm_ext.fe_length += st->st_blksize;
402 if (force_extent && *num_extents != 0) {
403 if (fm_last.fe_length) {
404 expected = fm_last.fe_physical +
405 (fm_ext.fe_logical - fm_last.fe_logical);
406 if (expected == fm_ext.fe_physical)
409 print_extent_info(&fm_ext, *num_extents - 1, expected,
416 static int frag_report(const char *filename)
418 static struct statfs fsinfo;
419 static unsigned int blksize;
420 ext2fs_struct_stat st;
423 unsigned long long numblocks;
424 int data_blocks_per_cyl = 1;
425 int num_extents = 1, expected = ~0;
427 static dev_t last_device;
431 #if defined(HAVE_OPEN64) && !defined(__OSX_AVAILABLE_BUT_DEPRECATED)
432 fd = open64(filename, O_RDONLY);
434 fd = open(filename, O_RDONLY);
442 #if defined(HAVE_FSTAT64) && !defined(__OSX_AVAILABLE_BUT_DEPRECATED)
443 if (fstat64(fd, &st) < 0) {
445 if (fstat(fd, &st) < 0) {
452 if (last_device != st.st_dev) {
453 if (fstatfs(fd, &fsinfo) < 0) {
458 if (ioctl(fd, FIGETBSZ, &blksize) < 0)
459 blksize = fsinfo.f_bsize;
461 printf("Filesystem type is: %lx\n",
462 (unsigned long)fsinfo.f_type);
464 st.st_blksize = blksize;
465 if (fsinfo.f_type == 0xef51 || fsinfo.f_type == 0xef52 ||
466 fsinfo.f_type == 0xef53) {
469 if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) == 0 &&
470 !(flags & EXT4_EXTENTS_FL))
474 /* Check if filesystem is Lustre. Always print in extent format
475 * with 1kB blocks, using the device-relative logical offsets. */
476 if (fsinfo.f_type == LUSTRE_SUPER_MAGIC) {
478 blocksize = blocksize ?: 1024;
482 long cylgroups = div_ceil(fsinfo.f_blocks, blksize * 8);
484 if (verbose && last_device != st.st_dev)
485 printf("Filesystem cylinder groups approximately %ld\n",
488 data_blocks_per_cyl = blksize * 8 -
489 (fsinfo.f_files / 8 / cylgroups) - 3;
491 last_device = st.st_dev;
493 width = int_log10(fsinfo.f_blocks);
494 if (width > physical_width)
495 physical_width = width;
497 numblocks = (st.st_size + blksize - 1) / blksize;
499 blk_shift = int_log2(blocksize);
501 blk_shift = int_log2(blksize);
503 width = int_log10(numblocks);
504 if (width > logical_width)
505 logical_width = width;
507 printf("File size of %s is %llu (%llu block%s of %d bytes)\n",
508 filename, (unsigned long long)st.st_size,
509 numblocks * blksize >> blk_shift,
510 numblocks == 1 ? "" : "s", 1 << blk_shift);
513 rc = filefrag_fiemap(fd, blk_shift, &num_extents, &st);
517 if (force_bmap || rc < 0) { /* FIEMAP failed, try FIBMAP instead */
518 expected = filefrag_fibmap(fd, blk_shift, &num_extents,
519 &st, numblocks, is_ext2);
521 if (expected == -EINVAL || expected == -ENOTTY) {
522 fprintf(stderr, "%s: FIBMAP unsupported\n",
524 } else if (expected == -EPERM) {
526 "%s: FIBMAP requires root privileges\n",
529 fprintf(stderr, "%s: FIBMAP error: %s",
530 filename, strerror(expected));
537 expected = expected / data_blocks_per_cyl + 1;
540 if (num_extents == 1)
541 printf("%s: 1 extent found", filename);
543 printf("%s: %d extents found", filename, num_extents);
544 /* count, and thus expected, only set for indirect FIBMAP'd files */
545 if (is_ext2 && expected && expected < num_extents)
546 printf(", perfection would be %d extent%s\n", expected,
547 (expected > 1) ? "s" : "");
556 static void usage(const char *progname)
558 fprintf(stderr, "Usage: %s [-b{blocksize}] [-BeksvxX] file ...\n",
563 int main(int argc, char**argv)
568 while ((c = getopt(argc, argv, "Bb::eklsvxX")) != EOF) {
577 blocksize = strtoul(optarg, &end, 0);
579 #if __GNUC_PREREQ (7, 0)
580 #pragma GCC diagnostic push
581 #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
599 #if __GNUC_PREREQ (7, 0)
600 #pragma GCC diagnostic pop
603 } else { /* Allow -b without argument for compat. Remove
604 * this eventually so "-b {blocksize}" works */
605 fprintf(stderr, "%s: -b needs a blocksize "
606 "option, assuming 1024-byte blocks.\n",
643 for (cpp = argv + optind; *cpp != NULL; cpp++) {
644 int rc2 = frag_report(*cpp);
646 if (rc2 < 0 && rc == 0)