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
18 fputs("This program is only supported on Linux!\n", stderr);
22 #define _LARGEFILE64_SOURCE
37 #include <sys/types.h>
40 #include <sys/ioctl.h>
42 #include <ext2fs/ext2_types.h>
43 #include <ext2fs/fiemap.h>
46 int no_bs = 0; /* Don't use the files blocksize, use 1K blocksize */
47 int sync_file = 0; /* fsync file before getting the mapping */
48 int xattr_map = 0; /* get xattr mapping */
50 int logical_width = 12;
51 int physical_width = 14;
52 unsigned long long filesize;
54 #define FILEFRAG_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
56 #define FIBMAP _IO(0x00, 1) /* bmap access */
57 #define FIGETBSZ _IO(0x00, 2) /* get the block size used for bmap */
58 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
60 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
61 #define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
63 static int int_log2(int arg)
75 static int int_log10(unsigned long long arg)
87 static unsigned int div_ceil(unsigned int a, unsigned int b)
91 return ((a - 1) / b) + 1;
94 static int get_bmap(int fd, unsigned long block, unsigned long *phy_blk)
100 ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes pointer to integer */
102 if (errno == EPERM) {
103 fprintf(stderr, "No permission to use FIBMAP ioctl; "
104 "must have root privileges\n");
114 static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
115 unsigned long long expected, int blk_shift)
118 unsigned long long logical_blk;
119 unsigned long ext_len;
120 char flags[256] = "";
122 /* For inline data all offsets should be in terms of bytes, not blocks */
123 if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
126 ext_len = fm_extent->fe_length >> blk_shift;
127 logical_blk = fm_extent->fe_logical >> blk_shift;
128 phy_blk = fm_extent->fe_physical >> blk_shift;
130 if (fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN)
131 strcat(flags, "unknown,");
132 if (fm_extent->fe_flags & FIEMAP_EXTENT_DELALLOC)
133 strcat(flags, "delalloc,");
134 if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_ENCRYPTED)
135 strcat(flags, "encrypted,");
136 if (fm_extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)
137 strcat(flags, "not_aligned,");
138 if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
139 strcat(flags, "inline,");
140 if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_TAIL)
141 strcat(flags, "tail_packed,");
142 if (fm_extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)
143 strcat(flags, "unwritten,");
144 if (fm_extent->fe_flags & FIEMAP_EXTENT_MERGED)
145 strcat(flags, "merged,");
147 if (fm_extent->fe_logical + fm_extent->fe_length >= filesize)
148 strcat(flags, "eof,");
150 /* Remove trailing comma, if any */
152 flags[strlen(flags) - 1] = '\0';
155 printf("%4d %*llu %*llu %*llu %6lu %s\n",
156 cur_ex, logical_width, logical_blk,
157 physical_width, phy_blk, physical_width, expected,
160 printf("%4d %*llu %*llu %*s %6lu %s\n",
161 cur_ex, logical_width, logical_blk,
162 physical_width, phy_blk, physical_width, "",
166 static int filefrag_fiemap(int fd, int blk_shift, int *num_extents)
169 struct fiemap *fiemap = (struct fiemap *)buf;
170 struct fiemap_extent *fm_ext = &fiemap->fm_extents[0];
171 int count = (sizeof(buf) - sizeof(*fiemap)) /
172 sizeof(struct fiemap_extent);
173 unsigned long long last_blk = 0;
174 unsigned long flags = 0;
176 static int fiemap_incompat_printed;
177 int fiemap_header_printed = 0;
178 int tot_extents = 1, n = 0;
182 memset(fiemap, 0, sizeof(struct fiemap));
185 * If count (and therefore fm_extent_count) == 0, FIEMAP
186 * returns count of extents found without filling in details.
192 flags |= FIEMAP_FLAG_SYNC;
195 flags |= FIEMAP_FLAG_XATTR;
198 fiemap->fm_length = ~0ULL;
199 fiemap->fm_flags = flags;
200 fiemap->fm_extent_count = count;
201 rc = ioctl(fd, FS_IOC_FIEMAP, (unsigned long) fiemap);
203 if (errno == EBADR && fiemap_incompat_printed == 0) {
204 printf("FIEMAP failed with unsupported "
205 "flags %x\n", fiemap->fm_flags);
206 fiemap_incompat_printed = 1;
211 if (verbose && !fiemap_header_printed) {
213 * No extents on first call?
214 * Skip header and show 0 extents.
216 if (fiemap->fm_mapped_extents == 0) {
220 printf(" ext %*s %*s %*s length flags\n", logical_width,
221 "logical", physical_width, "physical",
222 physical_width, "expected");
223 fiemap_header_printed = 1;
227 *num_extents = fiemap->fm_mapped_extents;
231 /* If 0 extents are returned, then more ioctls are not needed */
232 if (fiemap->fm_mapped_extents == 0)
235 for (i = 0; i < fiemap->fm_mapped_extents; i++) {
236 __u64 phy_blk, logical_blk;
237 unsigned long ext_len;
239 phy_blk = fm_ext[i].fe_physical >> blk_shift;
240 ext_len = fm_ext[i].fe_length >> blk_shift;
241 logical_blk = fm_ext[i].fe_logical >> blk_shift;
243 if (logical_blk && phy_blk != last_blk + 1)
247 print_extent_info(&fm_ext[i], n, last_blk, blk_shift);
249 last_blk = phy_blk + ext_len - 1;
250 if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
255 fiemap->fm_start = (fm_ext[i-1].fe_logical +
256 fm_ext[i-1].fe_length);
259 *num_extents = tot_extents;
264 #define EXT2_DIRECT 12
266 static void frag_report(const char *filename)
268 struct statfs fsinfo;
270 struct stat64 fileinfo;
272 struct stat fileinfo;
276 unsigned long block, last_block = 0, numblocks, i, count;
277 long bpib; /* Blocks per indirect block */
279 int num_extents = 0, expected;
286 fd = open64(filename, O_RDONLY);
288 fd = open(filename, O_RDONLY);
295 if (statfs(filename, &fsinfo) < 0) {
300 if (stat64(filename, &fileinfo) < 0) {
302 if (stat(filename, &fileinfo) < 0) {
307 if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) < 0)
309 if (!(flags & EXT4_EXTENTS_FL) &&
310 ((fsinfo.f_type == 0xef51) || (fsinfo.f_type == 0xef52) ||
311 (fsinfo.f_type == 0xef53)))
314 printf("Filesystem type is: %lx\n",
315 (unsigned long) fsinfo.f_type);
317 cylgroups = div_ceil(fsinfo.f_blocks, fsinfo.f_bsize*8);
318 if (verbose && is_ext2 && once)
319 printf("Filesystem cylinder groups is approximately %ld\n",
322 physical_width = int_log10(fsinfo.f_blocks);
323 if (physical_width < 8)
326 if (ioctl(fd, FIGETBSZ, &bs) < 0) { /* FIGETBSZ takes an int */
336 numblocks = (fileinfo.st_size + (bs-1)) / bs;
337 logical_width = int_log10(numblocks);
338 if (logical_width < 7)
340 filesize = (long long)fileinfo.st_size;
342 printf("File size of %s is %lld (%ld block%s, blocksize %d)\n",
343 filename, (long long) fileinfo.st_size, numblocks,
344 numblocks == 1 ? "" : "s", bs);
346 filefrag_fiemap(fd, int_log2(bs), &num_extents) != 0) {
347 for (i = 0, count = 0; i < numblocks; i++) {
348 if (is_ext2 && last_block) {
349 if (((i-EXT2_DIRECT) % bpib) == 0)
351 if (((i-EXT2_DIRECT-bpib) % (bpib*bpib)) == 0)
353 if (((i-EXT2_DIRECT-bpib-bpib*bpib) %
354 (((__u64) bpib)*bpib*bpib)) == 0)
357 rc = get_bmap(fd, i, &block);
363 if (last_block && (block != last_block+1) ) {
365 printf("Discontinuity: Block %ld is at "
367 i, block, last_block+1);
373 if (num_extents == 1)
374 printf("%s: 1 extent found", filename);
376 printf("%s: %d extents found", filename, num_extents);
377 expected = (count/((bs*8)-(fsinfo.f_files/8/cylgroups)-3))+1;
378 if (is_ext2 && expected < num_extents)
379 printf(", perfection would be %d extent%s\n", expected,
380 (expected>1) ? "s" : "");
387 static void usage(const char *progname)
389 fprintf(stderr, "Usage: %s [-Bbvsx] file ...\n", progname);
393 int main(int argc, char**argv)
398 while ((c = getopt(argc, argv, "Bbsvx")) != EOF)
421 for (cpp=argv+optind; *cpp; cpp++)