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-rw-r--r--misc/filefrag.c695
1 files changed, 695 insertions, 0 deletions
diff --git a/misc/filefrag.c b/misc/filefrag.c
new file mode 100644
index 0000000..eaaa90a
--- /dev/null
+++ b/misc/filefrag.c
@@ -0,0 +1,695 @@
+/*
+ * filefrag.c -- report if a particular file is fragmented
+ *
+ * Copyright 2003 by Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include "config.h"
+#ifndef __linux__
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(void) {
+ fputs("This program is only supported on Linux!\n", stderr);
+ exit(EXIT_FAILURE);
+}
+#else
+#ifndef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE
+#endif
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <fcntl.h>
+#include <errno.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern char *optarg;
+extern int optind;
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <sys/ioctl.h>
+#ifdef HAVE_LINUX_FD_H
+#include <linux/fd.h>
+#endif
+#include <ext2fs/ext2fs.h>
+#include <ext2fs/ext2_types.h>
+#include <ext2fs/fiemap.h>
+#include "../version.h"
+
+int verbose = 0;
+unsigned int blocksize; /* Use specified blocksize (default 1kB) */
+int sync_file = 0; /* fsync file before getting the mapping */
+int precache_file = 0; /* precache the file before getting the mapping */
+int xattr_map = 0; /* get xattr mapping */
+int force_bmap; /* force use of FIBMAP instead of FIEMAP */
+int force_extent; /* print output in extent format always */
+int use_extent_cache; /* Use extent cache */
+int logical_width = 8;
+int physical_width = 10;
+const char *ext_fmt = "%4d: %*llu..%*llu: %*llu..%*llu: %6llu: %s\n";
+const char *hex_fmt = "%4d: %*llx..%*llx: %*llx..%*llx: %6llx: %s\n";
+
+#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 LUSTRE_SUPER_MAGIC 0x0BD00BD0
+
+#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
+#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
+
+static int ulong_log2(unsigned long arg)
+{
+ int l = 0;
+
+ arg >>= 1;
+ while (arg) {
+ l++;
+ arg >>= 1;
+ }
+ return l;
+}
+
+static int ulong_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;
+
+ b = block;
+ ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes pointer to integer */
+ if (ret < 0)
+ return -errno;
+ *phy_blk = b;
+
+ return ret;
+}
+
+static void print_extent_header(void)
+{
+ printf(" ext: %*s %*s length: %*s flags:\n",
+ logical_width * 2 + 3,
+ "logical_offset:",
+ physical_width * 2 + 3, "physical_offset:",
+ physical_width + 1,
+ "expected:");
+}
+
+static void print_flag(__u32 *flags, __u32 mask, char *buf, const char *name)
+{
+ char hex[sizeof(mask) * 2 + 4]; /* 2 chars/byte + 0x, + NUL */
+
+ if ((*flags & mask) == 0)
+ return;
+
+ if (name == NULL) {
+ sprintf(hex, "%#04x,", mask);
+ name = hex;
+ }
+ strcat(buf, name);
+ *flags &= ~mask;
+}
+
+static void print_flags(__u32 fe_flags, char *flags, int len, int print_unknown)
+{
+ __u32 mask;
+
+ print_flag(&fe_flags, FIEMAP_EXTENT_LAST, flags, "last,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_UNKNOWN, flags, "unknown_loc,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_DELALLOC, flags, "delalloc,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_ENCODED, flags, "encoded,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_DATA_ENCRYPTED, flags,"encrypted,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_NOT_ALIGNED, flags, "not_aligned,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_DATA_INLINE, flags, "inline,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_DATA_TAIL, flags, "tail_packed,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_UNWRITTEN, flags, "unwritten,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_MERGED, flags, "merged,");
+ print_flag(&fe_flags, FIEMAP_EXTENT_SHARED, flags, "shared,");
+ print_flag(&fe_flags, EXT4_FIEMAP_EXTENT_HOLE, flags, "hole,");
+
+ if (!print_unknown)
+ goto out;
+
+ /* print any unknown flags as hex values */
+ for (mask = 1; fe_flags != 0 && mask != 0; mask <<= 1)
+ print_flag(&fe_flags, mask, flags, NULL);
+out:
+ /* Remove trailing comma, if any */
+ if (flags[0])
+ flags[strnlen(flags, len) - 1] = '\0';
+
+}
+
+static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
+ unsigned long long expected, int blk_shift,
+ ext2fs_struct_stat *st)
+{
+ unsigned long long physical_blk;
+ unsigned long long logical_blk;
+ unsigned long long ext_len;
+ unsigned long long ext_blks;
+ unsigned long long ext_blks_phys;
+ char flags[256] = "";
+
+ /* For inline data all offsets should be in bytes, not blocks */
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
+ blk_shift = 0;
+
+ ext_len = fm_extent->fe_length >> blk_shift;
+ ext_blks = (fm_extent->fe_length - 1) >> blk_shift;
+ logical_blk = fm_extent->fe_logical >> blk_shift;
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN) {
+ physical_blk = 0;
+ } else {
+ physical_blk = fm_extent->fe_physical >> blk_shift;
+ }
+
+ if (expected &&
+ !(fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN) &&
+ !(fm_extent->fe_flags & EXT4_FIEMAP_EXTENT_HOLE))
+ sprintf(flags, ext_fmt == hex_fmt ? "%*llx: " : "%*llu: ",
+ physical_width, expected >> blk_shift);
+ else
+ sprintf(flags, "%.*s ", physical_width, " ");
+
+ print_flags(fm_extent->fe_flags, flags, sizeof(flags), 1);
+
+ if (fm_extent->fe_logical + fm_extent->fe_length >=
+ (unsigned long long)st->st_size)
+ strcat(flags, flags[0] ? ",eof" : "eof");
+
+ if ((fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN) ||
+ (fm_extent->fe_flags & EXT4_FIEMAP_EXTENT_HOLE)) {
+ ext_len = 0;
+ ext_blks_phys = 0;
+ } else
+ ext_blks_phys = ext_blks;
+
+ printf(ext_fmt, cur_ex, logical_width, logical_blk,
+ logical_width, logical_blk + ext_blks,
+ physical_width, physical_blk,
+ physical_width, physical_blk + ext_blks_phys,
+ ext_len, flags);
+}
+
+static int filefrag_fiemap(int fd, int blk_shift, int *num_extents,
+ ext2fs_struct_stat *st)
+{
+ __u64 buf[2048]; /* __u64 for proper field alignment */
+ struct fiemap *fiemap = (struct fiemap *)buf;
+ struct fiemap_extent *fm_ext = &fiemap->fm_extents[0];
+ struct fiemap_extent fm_last;
+ int count = (sizeof(buf) - sizeof(*fiemap)) /
+ sizeof(struct fiemap_extent);
+ unsigned long long expected = 0;
+ unsigned long long expected_dense = 0;
+ unsigned long flags = 0;
+ unsigned int i;
+ unsigned long cmd = FS_IOC_FIEMAP;
+ int fiemap_header_printed = 0;
+ int tot_extents = 0, n = 0;
+ int last = 0;
+ int rc;
+
+ memset(fiemap, 0, sizeof(struct fiemap));
+ memset(&fm_last, 0, sizeof(fm_last));
+
+ if (sync_file)
+ flags |= FIEMAP_FLAG_SYNC;
+
+ if (precache_file)
+ flags |= FIEMAP_FLAG_CACHE;
+
+ if (xattr_map)
+ flags |= FIEMAP_FLAG_XATTR;
+
+ if (use_extent_cache)
+ cmd = EXT4_IOC_GET_ES_CACHE;
+
+ do {
+ fiemap->fm_length = ~0ULL;
+ fiemap->fm_flags = flags;
+ fiemap->fm_extent_count = count;
+ rc = ioctl(fd, cmd, (unsigned long) fiemap);
+ if (rc < 0) {
+ static int fiemap_incompat_printed;
+
+ rc = -errno;
+ if (rc == -EBADR && !fiemap_incompat_printed) {
+ fprintf(stderr, "FIEMAP failed with unknown "
+ "flags %x\n",
+ fiemap->fm_flags);
+ fiemap_incompat_printed = 1;
+ }
+ return rc;
+ }
+
+ /* If 0 extents are returned, then more ioctls are not needed */
+ if (fiemap->fm_mapped_extents == 0)
+ break;
+
+ if (verbose && !fiemap_header_printed) {
+ print_extent_header();
+ fiemap_header_printed = 1;
+ }
+
+ for (i = 0; i < fiemap->fm_mapped_extents; i++) {
+ expected_dense = fm_last.fe_physical +
+ fm_last.fe_length;
+ expected = fm_last.fe_physical +
+ fm_ext[i].fe_logical - fm_last.fe_logical;
+ if (fm_ext[i].fe_logical != 0 &&
+ fm_ext[i].fe_physical != expected &&
+ fm_ext[i].fe_physical != expected_dense) {
+ tot_extents++;
+ } else {
+ expected = 0;
+ if (!tot_extents)
+ tot_extents = 1;
+ }
+ if (verbose)
+ print_extent_info(&fm_ext[i], n, expected,
+ blk_shift, st);
+ if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
+ last = 1;
+ fm_last = fm_ext[i];
+ n++;
+ }
+
+ fiemap->fm_start = (fm_ext[i - 1].fe_logical +
+ fm_ext[i - 1].fe_length);
+ } while (last == 0);
+
+ *num_extents = tot_extents;
+
+ return 0;
+}
+
+#define EXT2_DIRECT 12
+
+static int filefrag_fibmap(int fd, int blk_shift, int *num_extents,
+ ext2fs_struct_stat *st,
+ unsigned long numblocks, int is_ext2)
+{
+ struct fiemap_extent fm_ext, fm_last;
+ unsigned long i, last_block;
+ unsigned long long logical, expected = 0;
+ /* Blocks per indirect block */
+ const long bpib = st->st_blksize / 4;
+ int count;
+
+ memset(&fm_ext, 0, sizeof(fm_ext));
+ memset(&fm_last, 0, sizeof(fm_last));
+ if (force_extent) {
+ fm_ext.fe_flags = FIEMAP_EXTENT_MERGED;
+ }
+
+ if (sync_file && fsync(fd) != 0)
+ return -errno;
+
+ for (i = 0, logical = 0, *num_extents = 0, count = last_block = 0;
+ i < numblocks;
+ i++, logical += st->st_blksize) {
+ unsigned long block = 0;
+ int rc;
+
+ 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) %
+ (((unsigned long long)bpib) * bpib * bpib)) == 0)
+ last_block++;
+ }
+ rc = get_bmap(fd, i, &block);
+ if (rc < 0)
+ return rc;
+ if (block == 0)
+ continue;
+
+ if (*num_extents == 0 || block != last_block + 1 ||
+ fm_ext.fe_logical + fm_ext.fe_length != logical) {
+ /*
+ * This is the start of a new extent; figure out where
+ * we expected it to be and report the extent.
+ */
+ if (*num_extents != 0 && fm_last.fe_length) {
+ expected = fm_last.fe_physical +
+ (fm_ext.fe_logical - fm_last.fe_logical);
+ if (expected == fm_ext.fe_physical)
+ expected = 0;
+ }
+ if (force_extent && *num_extents == 0)
+ print_extent_header();
+ if (force_extent && *num_extents != 0) {
+ print_extent_info(&fm_ext, *num_extents - 1,
+ expected, blk_shift, st);
+ }
+ if (verbose && expected != 0) {
+ printf("Discontinuity: Block %llu is at %llu "
+ "(was %llu)\n",
+ (unsigned long long) (fm_ext.fe_logical / st->st_blksize),
+ (unsigned long long) (fm_ext.fe_physical / st->st_blksize),
+ (unsigned long long) (expected / st->st_blksize));
+ }
+ /* create the new extent */
+ fm_last = fm_ext;
+ (*num_extents)++;
+ fm_ext.fe_physical = block * st->st_blksize;
+ fm_ext.fe_logical = logical;
+ fm_ext.fe_length = 0;
+ }
+ fm_ext.fe_length += st->st_blksize;
+ last_block = block;
+ }
+ if (force_extent && *num_extents != 0) {
+ if (fm_last.fe_length) {
+ expected = fm_last.fe_physical +
+ (fm_ext.fe_logical - fm_last.fe_logical);
+ if (expected == fm_ext.fe_physical)
+ expected = 0;
+ }
+ print_extent_info(&fm_ext, *num_extents - 1, expected,
+ blk_shift, st);
+ }
+
+ return count;
+}
+
+static int frag_report(const char *filename)
+{
+ static struct statfs fsinfo;
+ static unsigned int blksize;
+ ext2fs_struct_stat st;
+ int blk_shift;
+ long fd;
+ unsigned long long numblocks;
+ int data_blocks_per_cyl = 1;
+ int num_extents = 1, expected = ~0;
+ int is_ext2 = 0;
+ static dev_t last_device;
+ int width;
+ int rc = 0;
+
+#if defined(HAVE_OPEN64) && !defined(__OSX_AVAILABLE_BUT_DEPRECATED)
+ fd = open64(filename, O_RDONLY);
+#else
+ fd = open(filename, O_RDONLY);
+#endif
+ if (fd < 0) {
+ rc = -errno;
+ perror("open");
+ return rc;
+ }
+
+#if defined(HAVE_FSTAT64) && !defined(__OSX_AVAILABLE_BUT_DEPRECATED)
+ if (fstat64(fd, &st) < 0) {
+#else
+ if (fstat(fd, &st) < 0) {
+#endif
+ rc = -errno;
+ perror("stat");
+ goto out_close;
+ }
+
+ if ((last_device != st.st_dev) || !st.st_dev) {
+ if (fstatfs(fd, &fsinfo) < 0) {
+ rc = -errno;
+ perror("fstatfs");
+ goto out_close;
+ }
+ if ((ioctl(fd, FIGETBSZ, &blksize) < 0) || !blksize)
+ blksize = fsinfo.f_bsize;
+ if (verbose)
+ printf("Filesystem type is: %lx\n",
+ (unsigned long)fsinfo.f_type);
+ }
+ st.st_blksize = blksize;
+ if (fsinfo.f_type == 0xef51 || fsinfo.f_type == 0xef52 ||
+ fsinfo.f_type == 0xef53) {
+ unsigned int flags;
+
+ if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) == 0 &&
+ !(flags & EXT4_EXTENTS_FL))
+ is_ext2 = 1;
+ }
+
+ if (is_ext2) {
+ long cylgroups = div_ceil(fsinfo.f_blocks, blksize * 8);
+
+ if (verbose && last_device != st.st_dev)
+ printf("Filesystem cylinder groups approximately %ld\n",
+ cylgroups);
+
+ data_blocks_per_cyl = blksize * 8 -
+ (fsinfo.f_files / 8 / cylgroups) - 3;
+ }
+ last_device = st.st_dev;
+
+ width = ulong_log10(fsinfo.f_blocks);
+ if (width > physical_width)
+ physical_width = width;
+
+ numblocks = (st.st_size + blksize - 1) / blksize;
+ if (blocksize != 0)
+ blk_shift = ulong_log2(blocksize);
+ else
+ blk_shift = ulong_log2(blksize);
+
+ if (use_extent_cache)
+ width = 10;
+ else
+ width = ulong_log10(numblocks);
+ if (width > logical_width)
+ logical_width = width;
+ if (verbose) {
+ __u32 state;
+
+ printf("File size of %s is %llu (%llu block%s of %d bytes)",
+ filename, (unsigned long long) st.st_size,
+ (unsigned long long) (numblocks * blksize >> blk_shift),
+ numblocks == 1 ? "" : "s", 1 << blk_shift);
+ if (use_extent_cache &&
+ ioctl(fd, EXT4_IOC_GETSTATE, &state) == 0 &&
+ (state & EXT4_STATE_FLAG_EXT_PRECACHED))
+ fputs(" -- pre-cached", stdout);
+ fputc('\n', stdout);
+ }
+
+ if (!force_bmap) {
+ rc = filefrag_fiemap(fd, blk_shift, &num_extents, &st);
+ expected = 0;
+ if (rc < 0 &&
+ (use_extent_cache || precache_file || xattr_map)) {
+ if (rc != -EBADR)
+ fprintf(stderr, "%s: %s: %s\n ",
+ filename,
+ use_extent_cache ?
+ "EXT4_IOC_GET_ES_CACHE" :
+ "FS_IOC_FIEMAP", strerror(-rc));
+ goto out_close;
+ }
+ }
+
+ if (force_bmap || rc < 0) { /* FIEMAP failed, try FIBMAP instead */
+ expected = filefrag_fibmap(fd, blk_shift, &num_extents,
+ &st, numblocks, is_ext2);
+ if (expected < 0) {
+ if (expected == -EINVAL || expected == -ENOTTY) {
+ fprintf(stderr, "%s: FIBMAP%s unsupported\n",
+ filename, force_bmap ? "" : "/FIEMAP");
+ } else if (expected == -EPERM) {
+ fprintf(stderr,
+ "%s: FIBMAP requires root privileges\n",
+ filename);
+ } else {
+ fprintf(stderr, "%s: FIBMAP error: %s",
+ filename, strerror(expected));
+ }
+ rc = expected;
+ goto out_close;
+ } else {
+ rc = 0;
+ }
+ expected = expected / data_blocks_per_cyl + 1;
+ }
+
+ if (num_extents == 1)
+ printf("%s: 1 extent found", filename);
+ else
+ printf("%s: %d extents found", filename, num_extents);
+ /* count, and thus expected, only set for indirect FIBMAP'd files */
+ if (is_ext2 && expected && expected < num_extents)
+ printf(", perfection would be %d extent%s\n", expected,
+ (expected > 1) ? "s" : "");
+ else
+ fputc('\n', stdout);
+out_close:
+ close(fd);
+
+ return rc;
+}
+
+static void usage(const char *progname)
+{
+ fprintf(stderr, "Usage: %s [-b{blocksize}[KMG]] [-BeEksvxX] file ...\n",
+ progname);
+ exit(1);
+}
+
+int main(int argc, char**argv)
+{
+ char **cpp;
+ int rc = 0, c;
+ int version = 0;
+
+ while ((c = getopt(argc, argv, "Bb::eEkPsvVxX")) != EOF) {
+ switch (c) {
+ case 'B':
+ force_bmap++;
+ break;
+ case 'b':
+ if (optarg) {
+ char *end;
+ unsigned long val;
+
+ val = strtoul(optarg, &end, 0);
+ if (end) {
+#if __GNUC_PREREQ (7, 0)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#endif
+ switch (end[0]) {
+ case 'g':
+ case 'G':
+ val *= 1024;
+ /* fall through */
+ case 'm':
+ case 'M':
+ val *= 1024;
+ /* fall through */
+ case 'k':
+ case 'K':
+ val *= 1024;
+ break;
+ default:
+ break;
+ }
+#if __GNUC_PREREQ (7, 0)
+#pragma GCC diagnostic pop
+#endif
+ }
+ /* Specifying too large a blocksize will just
+ * shift all extents down to zero length. Even
+ * 1GB is questionable, but caveat emptor. */
+ if (val > 1024 * 1024 * 1024) {
+ fprintf(stderr,
+ "%s: blocksize %lu over 1GB\n",
+ argv[0], val);
+ usage(argv[0]);
+ }
+ blocksize = val;
+ } else { /* Allow -b without argument for compat. Remove
+ * this eventually so "-b {blocksize}" works */
+ fprintf(stderr, "%s: -b needs a blocksize "
+ "option, assuming 1024-byte blocks.\n",
+ argv[0]);
+ blocksize = 1024;
+ }
+ break;
+ case 'E':
+ use_extent_cache++;
+ /* fallthrough */
+ case 'e':
+ force_extent++;
+ if (!verbose)
+ verbose++;
+ break;
+ case 'k':
+ blocksize = 1024;
+ break;
+ case 'P':
+ precache_file++;
+ break;
+ case 's':
+ sync_file++;
+ break;
+ case 'v':
+ verbose++;
+ break;
+ case 'V':
+ version++;
+ break;
+ case 'x':
+ xattr_map++;
+ break;
+ case 'X':
+ ext_fmt = hex_fmt;
+ break;
+ default:
+ usage(argv[0]);
+ break;
+ }
+ }
+ if (version) {
+ /* Print version number and exit */
+ printf("filefrag %s (%s)\n", E2FSPROGS_VERSION, E2FSPROGS_DATE);
+ if (version + verbose > 1) {
+ char flags[256] = "";
+
+ print_flags(0xffffffff, flags, sizeof(flags), 0);
+ printf("supported: %s\n", flags);
+ }
+ exit(0);
+ }
+
+ if (optind == argc)
+ usage(argv[0]);
+
+ for (cpp = argv + optind; *cpp != NULL; cpp++) {
+ int rc2 = frag_report(*cpp);
+
+ if (rc2 < 0 && rc == 0)
+ rc = rc2;
+ }
+
+ return -rc;
+}
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 15:43:49 +0000