/*
* filefrag.c -- report if a particular file is fragmented
- *
+ *
* Copyright 2003 by Theodore Ts'o.
*
* %Begin-Header%
#ifndef __linux__
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
int main(void) {
fputs("This program is only supported on Linux!\n", stderr);
#include <sys/vfs.h>
#include <sys/ioctl.h>
#include <linux/fd.h>
+#include <ext2fs/ext2_types.h>
+#include <ext2fs/fiemap.h>
int verbose = 0;
+int no_bs = 0; /* Don't use the files blocksize, use 1K blocksize */
+int sync_file = 0; /* fsync file before getting the mapping */
+int xattr_map = 0; /* get xattr mapping */
+int logical_width = 12;
+int physical_width = 14;
+unsigned long long filesize;
+
+#define FILEFRAG_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
-#define FIBMAP _IO(0x00,1) /* bmap access */
-#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
+#define FIBMAP _IO(0x00, 1) /* bmap access */
+#define FIGETBSZ _IO(0x00, 2) /* get the block size used for bmap */
+#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
-#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
+#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
-static unsigned long get_bmap(int fd, unsigned long block)
+static int int_log2(int arg)
+{
+ int l = 0;
+
+ arg >>= 1;
+ while (arg) {
+ l++;
+ arg >>= 1;
+ }
+ return l;
+}
+
+static int int_log10(unsigned long long arg)
+{
+ int l = 0;
+
+ arg = arg / 10;
+ while (arg) {
+ l++;
+ arg = arg / 10;
+ }
+ return l;
+}
+
+static unsigned int div_ceil(unsigned int a, unsigned int b)
+{
+ if (!a)
+ return 0;
+ return ((a - 1) / b) + 1;
+}
+
+static int get_bmap(int fd, unsigned long block, unsigned long *phy_blk)
{
int ret;
unsigned int b;
+ printf("Calling get_bmap for block %lu\n", block);
+ abort();
b = block;
- ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes a pointer to an integer */
+ ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes pointer to integer */
if (ret < 0) {
if (errno == EPERM) {
- fprintf(stderr, "No permission to use FIBMAP ioctl; must have root privileges\n");
+ fprintf(stderr, "No permission to use FIBMAP ioctl; "
+ "must have root privileges\n");
exit(1);
}
perror("FIBMAP");
}
- return b;
+ *phy_blk = b;
+
+ return ret;
+}
+
+static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
+ unsigned long long expected, int blk_shift)
+{
+ __u64 phy_blk;
+ unsigned long long logical_blk;
+ unsigned long ext_len;
+ char flags[256] = "";
+
+ /* For inline data all offsets should be in terms of bytes, not blocks */
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
+ blk_shift = 0;
+
+ ext_len = fm_extent->fe_length >> blk_shift;
+ logical_blk = fm_extent->fe_logical >> blk_shift;
+ phy_blk = fm_extent->fe_physical >> blk_shift;
+
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN)
+ strcat(flags, "unknown,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DELALLOC)
+ strcat(flags, "delalloc,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_ENCRYPTED)
+ strcat(flags, "encrypted,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)
+ strcat(flags, "not_aligned,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
+ strcat(flags, "inline,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_TAIL)
+ strcat(flags, "tail_packed,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)
+ strcat(flags, "unwritten,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_MERGED)
+ strcat(flags, "merged,");
+
+ if (fm_extent->fe_logical + fm_extent->fe_length >= filesize)
+ strcat(flags, "eof,");
+
+ /* Remove trailing comma, if any */
+ if (flags[0])
+ flags[strlen(flags) - 1] = '\0';
+
+ if (expected)
+ printf("%4d %*llu %*llu %*llu %6lu %s\n",
+ cur_ex, logical_width, logical_blk,
+ physical_width, phy_blk, physical_width, expected,
+ ext_len, flags);
+ else
+ printf("%4d %*llu %*llu %*s %6lu %s\n",
+ cur_ex, logical_width, logical_blk,
+ physical_width, phy_blk, physical_width, "",
+ ext_len, flags);
+}
+
+int filefrag_fiemap(int fd, int blk_shift, int *num_extents)
+{
+ char buf[4096] = "";
+ struct fiemap *fiemap = (struct fiemap *)buf;
+ struct fiemap_extent *fm_ext = &fiemap->fm_extents[0];
+ int count = (sizeof(buf) - sizeof(*fiemap)) /
+ sizeof(struct fiemap_extent);
+ unsigned long long logical_blk = 0, last_blk = 0;
+ unsigned long flags = 0;
+ static int fiemap_incompat_printed;
+ int tot_extents = 1, n = 0;
+ int last = 0, eof = 0;
+ int i, rc;
+
+ fiemap->fm_length = ~0ULL;
+
+ memset(fiemap, 0, sizeof(struct fiemap));
+
+ if (!verbose)
+ count = 0;
+
+ if (sync_file)
+ flags |= FIEMAP_FLAG_SYNC;
+
+ if (xattr_map)
+ flags |= FIEMAP_FLAG_XATTR;
+
+ if (verbose)
+ printf(" ext %*s %*s %*s length flags\n", logical_width,
+ "logical", physical_width, "physical",
+ physical_width, "expected");
+
+ do {
+ fiemap->fm_length = ~0ULL;
+ fiemap->fm_flags = flags;
+ fiemap->fm_extent_count = count;
+ rc = ioctl(fd, FS_IOC_FIEMAP, (unsigned long) fiemap);
+ if (rc == -EBADR) {
+ if (fiemap_incompat_printed == 0) {
+ printf("FIEMAP failed with unsupported "
+ "flags %x\n", fiemap->fm_flags);
+ fiemap_incompat_printed = 1;
+ }
+ }
+ if (rc)
+ return rc;
+
+ if (!verbose) {
+ *num_extents = fiemap->fm_mapped_extents;
+ goto out;
+ }
+
+ /* If 0 extents are returned, then more ioctls are not needed */
+ if (fiemap->fm_mapped_extents == 0)
+ break;
+
+ for (i = 0; i < fiemap->fm_mapped_extents; i++) {
+ __u64 phy_blk, phy_start, logical_blk;
+ unsigned long ext_len;
+
+ phy_blk = fm_ext[i].fe_physical >> blk_shift;
+ ext_len = fm_ext[i].fe_length >> blk_shift;
+ logical_blk = fm_ext[i].fe_logical >> blk_shift;
+
+ if (logical_blk && phy_blk != last_blk + 1)
+ tot_extents++;
+ else
+ last_blk = 0;
+ print_extent_info(&fm_ext[i], n, last_blk, blk_shift);
+
+ last_blk = phy_blk + ext_len - 1;
+ if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
+ last = 1;
+ n++;
+ }
+
+ fiemap->fm_start += fm_ext[i-1].fe_logical +
+ fm_ext[i-1].fe_length;
+ } while (last == 0);
+
+ *num_extents = tot_extents;
+out:
+ return 0;
}
#define EXT2_DIRECT 12
struct stat fileinfo;
#endif
int bs;
- long i, fd;
- unsigned long block, last_block = 0, numblocks;
+ long fd;
+ unsigned long block, last_block = 0, numblocks, i, count;
long bpib; /* Blocks per indirect block */
long cylgroups;
- int discont = 0, expected;
+ int num_extents = 0, expected;
int is_ext2 = 0;
+ static int once = 1;
unsigned int flags;
+ unsigned long first_blk, last_blk;
+ int rc;
+
+#ifdef HAVE_OPEN64
+ fd = open64(filename, O_RDONLY);
+#else
+ fd = open(filename, O_RDONLY);
+#endif
+ if (fd < 0) {
+ perror("open");
+ return;
+ }
if (statfs(filename, &fsinfo) < 0) {
perror("statfs");
perror("stat");
return;
}
- if (!S_ISREG(fileinfo.st_mode)) {
- printf("%s: Not a regular file\n", filename);
- return;
- }
- if ((fsinfo.f_type == 0xef51) || (fsinfo.f_type == 0xef52) ||
- (fsinfo.f_type == 0xef53))
+ if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) < 0)
+ flags = 0;
+ if (!(flags & EXT4_EXTENTS_FL) &&
+ ((fsinfo.f_type == 0xef51) || (fsinfo.f_type == 0xef52) ||
+ (fsinfo.f_type == 0xef53)))
is_ext2++;
- if (verbose) {
- printf("Filesystem type is: %x\n", fsinfo.f_type);
- }
- cylgroups = (fsinfo.f_blocks + fsinfo.f_bsize*8-1) / fsinfo.f_bsize*8;
- if (verbose) {
- printf("Filesystem cylinder groups is approximately %ld\n",
+ if (verbose && once)
+ printf("Filesystem type is: %lx\n",
+ (unsigned long) fsinfo.f_type);
+
+ cylgroups = div_ceil(fsinfo.f_blocks, fsinfo.f_bsize*8);
+ if (verbose && is_ext2 && once)
+ printf("Filesystem cylinder groups is approximately %ld\n",
cylgroups);
- }
-#ifdef HAVE_OPEN64
- fd = open64(filename, O_RDONLY);
-#else
- fd = open(filename, O_RDONLY);
-#endif
- if (fd < 0) {
- perror("open");
- return;
- }
+
+ physical_width = int_log10(fsinfo.f_blocks);
+ if (physical_width < 8)
+ physical_width = 8;
+
if (ioctl(fd, FIGETBSZ, &bs) < 0) { /* FIGETBSZ takes an int */
perror("FIGETBSZ");
close(fd);
return;
}
- if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) < 0)
- flags = 0;
- if (flags & EXT3_EXTENTS_FL) {
- printf("File is stored in extents format\n");
- is_ext2 = 0;
- }
- if (verbose)
- printf("Blocksize of file %s is %d\n", filename, bs);
+
+ if (no_bs)
+ bs = 1024;
+
bpib = bs / 4;
numblocks = (fileinfo.st_size + (bs-1)) / bs;
- if (verbose) {
- printf("File size of %s is %lld (%ld blocks)\n", filename,
- (long long) fileinfo.st_size, numblocks);
- printf("First block: %lu\nLast block: %lu\n",
- get_bmap(fd, 0), get_bmap(fd, numblocks - 1));
- }
- for (i=0; i < numblocks; i++) {
- if (is_ext2 && last_block) {
- if (((i-EXT2_DIRECT) % bpib) == 0)
- last_block++;
- if (((i-EXT2_DIRECT-bpib) % (bpib*bpib)) == 0)
- last_block++;
- if (((i-EXT2_DIRECT-bpib-bpib*bpib) % (bpib*bpib*bpib)) == 0)
- last_block++;
- }
- block = get_bmap(fd, i);
- if (block == 0)
- continue;
- if (last_block && (block != last_block +1) ) {
- if (verbose)
- printf("Discontinuity: Block %ld is at %lu (was %lu)\n",
- i, block, last_block);
- discont++;
+ logical_width = int_log10(numblocks);
+ if (logical_width < 7)
+ logical_width = 7;
+ filesize = (long long)fileinfo.st_size;
+ if (verbose)
+ printf("File size of %s is %lld (%ld block%s, blocksize %d)\n",
+ filename, (long long) fileinfo.st_size, numblocks,
+ numblocks == 1 ? "" : "s", bs);
+ if (filefrag_fiemap(fd, int_log2(bs), &num_extents) != 0) {
+ for (i = 0; i < numblocks; i++) {
+ if (is_ext2 && last_block) {
+ if (((i-EXT2_DIRECT) % bpib) == 0)
+ last_block++;
+ if (((i-EXT2_DIRECT-bpib) % (bpib*bpib)) == 0)
+ last_block++;
+ if (((i-EXT2_DIRECT-bpib-bpib*bpib) %
+ (bpib*bpib*bpib)) == 0)
+ last_block++;
+ }
+ rc = get_bmap(fd, i, &block);
+ if (block == 0)
+ continue;
+ if (last_block && (block != last_block+1) ) {
+ if (verbose)
+ printf("Discontinuity: Block %ld is at "
+ "%lu (was %lu)\n",
+ i, block, last_block+1);
+ num_extents++;
+ }
+ last_block = block;
}
- last_block = block;
}
- if (discont==0)
+ if (num_extents == 1)
printf("%s: 1 extent found", filename);
else
- printf("%s: %d extents found", filename, discont+1);
- expected = (numblocks/((bs*8)-(fsinfo.f_files/8/cylgroups)-3))+1;
- if (is_ext2 && expected != discont+1)
+ printf("%s: %d extents found", filename, num_extents);
+ expected = (count/((bs*8)-(fsinfo.f_files/8/cylgroups)-3))+1;
+ if (is_ext2 && expected < num_extents)
printf(", perfection would be %d extent%s\n", expected,
(expected>1) ? "s" : "");
else
fputc('\n', stdout);
close(fd);
+ once = 0;
}
static void usage(const char *progname)
{
- fprintf(stderr, "Usage: %s [-v] file ...\n", progname);
+ fprintf(stderr, "Usage: %s [-bvsx] file ...\n", progname);
exit(1);
}
{
char **cpp;
int c;
+ int ret;
- while ((c = getopt(argc, argv, "v")) != EOF)
+ while ((c = getopt(argc, argv, "bsvx")) != EOF)
switch (c) {
+ case 'b':
+ no_bs++;
+ break;
case 'v':
verbose++;
break;
+ case 's':
+ sync_file++;
+ break;
+ case 'x':
+ xattr_map++;
+ break;
default:
usage(argv[0]);
break;
}
if (optind == argc)
usage(argv[0]);
- for (cpp=argv+optind; *cpp; cpp++) {
- if (verbose)
- printf("Checking %s\n", *cpp);
+ for (cpp=argv+optind; *cpp; cpp++)
frag_report(*cpp);
- }
return 0;
}
#endif
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff