===================================================================
@@ -12,6 +12,7 @@
#ifndef __linux__
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
int main(void) {
fputs("This program is only supported on Linux!\n", stderr);
@@ -38,13 +39,23 @@ extern int optind;
#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 extent_format = 0; /* Print output in extent format */
+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 */
+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 FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
-#define FIBMAP _IO(0x00,1) /* bmap access */
-#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
-
-#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
+#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
static unsigned int div_ceil(unsigned int a, unsigned int b)
@@ -54,21 +65,177 @@ static unsigned int div_ceil(unsigned in
return ((a - 1) / b) + 1;
}
-static unsigned long get_bmap(int fd, unsigned long block)
+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 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,
+ 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_NO_DIRECT)
+ strcat(flags, "no_direct,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_SECONDARY)
+ strcat(flags, "secondary,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_NET)
+ strcat(flags, "remote,");
+ if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_COMPRESSED)
+ strcat(flags, "compressed,");
+ 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';
+
+ printf("%5d:%12llu..%12llu:%12llu..%12llu:%12lu: %4d: %s\n",
+ cur_ex, logical_blk, logical_blk + ext_len - 1,
+ phy_blk, phy_blk ? phy_blk + ext_len : 0, ext_len,
+ fm_extent->fe_device, 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 = 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 (extent_format && verbose)
+ printf(" ext:\t %s: start..end physical: start..end:\t "
+ "length: device: flags:\n", "logical");
+
+ 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("%s: 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 (extent_format) {
+ print_extent_info(&fm_ext[i], tot_extents,
+ blk_shift);
+ } else if (logical_blk && phy_blk != last_blk + 1) {
+ printf("Discontinuity: Block %llu is at %llu "
+ "(was %llu)\n", logical_blk, phy_blk,
+ last_blk);
+ }
+
+ last_blk = phy_blk + ext_len - 1;
+ if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
+ last = 1;
+ tot_extents++;
+ }
+
+ 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;
+}
+
+static int int_log2(int arg)
+{
+ int l = 0;
+
+ arg >>= 1;
+ while (arg) {
+ l++;
+ arg >>= 1;
+ }
+ return l;
}
#define EXT2_DIRECT 12
@@ -86,9 +253,11 @@ static void frag_report(const char *file
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;
unsigned int flags;
+ unsigned long first_blk, last_blk;
+ int rc;
if (statfs(filename, &fsinfo) < 0) {
perror("statfs");
@@ -113,6 +282,7 @@ static void frag_report(const char *file
printf("Filesystem type is: %lx\n",
(unsigned long) fsinfo.f_type);
}
+
cylgroups = div_ceil(fsinfo.f_blocks, fsinfo.f_bsize*8);
if (verbose) {
printf("Filesystem cylinder groups is approximately %ld\n",
@@ -132,6 +302,10 @@ static void frag_report(const char *file
close(fd);
return;
}
+
+ if (no_bs)
+ bs = 1024;
+
if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) < 0)
flags = 0;
if (flags & EXT4_EXTENTS_FL) {
@@ -143,39 +317,49 @@ static void frag_report(const char *file
printf("Blocksize of file %s is %d\n", filename, bs);
bpib = bs / 4;
numblocks = (fileinfo.st_size + (bs-1)) / bs;
+ filesize = (long long)fileinfo.st_size;
if (verbose) {
+ int rc1, rc2;
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, count=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;
- count++;
- if (last_block && (block != last_block +1) ) {
- if (verbose)
- printf("Discontinuity: Block %ld is at %lu (was %lu)\n",
- i, block, last_block);
- discont++;
+ filesize, numblocks);
+ if (extent_format == 0) {
+ rc1 = get_bmap(fd, 0, &first_blk);
+ rc2 = get_bmap(fd, numblocks - 1, &last_blk);
+ if (rc1 == 0 && rc2 == 0)
+ printf("First block: %lu\nLast block: %lu\n",
+ first_blk, last_blk);
+ }
+ }
+ if (is_ext2 || (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 = (count/((bs*8)-(fsinfo.f_files/8/cylgroups)-3))+1;
- if (is_ext2 && expected < discont+1)
+ printf("%s: %d extents found", filename, num_extents);
+ expected = (num_extents/((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
@@ -185,7 +369,7 @@ static void frag_report(const char *file
static void usage(const char *progname)
{
- fprintf(stderr, "Usage: %s [-v] file ...\n", progname);
+ fprintf(stderr, "Usage: %s [-bevsx] file ...\n", progname);
exit(1);
}
@@ -193,12 +377,26 @@ int main(int argc, char**argv)
{
char **cpp;
int c;
+ int ret;
- while ((c = getopt(argc, argv, "v")) != EOF)
+ while ((c = getopt(argc, argv, "besvx")) != EOF)
switch (c) {
+ case 'b':
+ no_bs++;
+ break;
case 'v':
verbose++;
break;
+ case 'e':
+ extent_format++;
+ break;
+ case 's':
+ sync_file++;
+ break;
+ case 'x':
+ xattr_map++;
+ extent_format++;
+ break;
default:
usage(argv[0]);
break;
===================================================================
@@ -0,0 +1,66 @@
+/*
+ * lib/ext2fs/fiemap.h
+ *
+ * Some portions copyright (C) 2007 Cluster File Systems, Inc
+ *
+ * Authors: Mark Fasheh <mfasheh@suse.com>
+ * Kalpak Shah <kalpak.shah@sun.com>
+ * Andreas Dilger <adilger@sun.com>
+ */
+
+#ifndef _EXT2FS_FIEMAP_H
+#define _EXT2FS_FIEMAP_H
+
+struct fiemap_extent {
+ __u64 fe_logical; /* logical offset in bytes for the start of
+ * the extent from the beginning of the file */
+ __u64 fe_physical; /* physical offset in bytes for the start
+ * of the extent from the beginning of the disk */
+ __u64 fe_length; /* length in bytes for this extent */
+ __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */
+ __u32 fe_device; /* device number for this extent */
+};
+
+struct fiemap {
+ __u64 fm_start; /* logical offset (inclusive) at
+ * which to start mapping (in) */
+ __u64 fm_length; /* logical length of mapping which
+ * userspace wants (in) */
+ __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */
+ __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
+ __u32 fm_extent_count; /* size of fm_extents array (in) */
+ __u32 fm_reserved;
+ struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
+};
+
+#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
+#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
+
+#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
+
+#define FIEMAP_EXTENT_LAST 0x00000001 /* Last extent in file. */
+#define FIEMAP_EXTENT_UNKNOWN 0x00000002 /* Data location unknown. */
+#define FIEMAP_EXTENT_DELALLOC 0x00000004 /* Location still pending.
+ * Sets EXTENT_UNKNOWN. */
+#define FIEMAP_EXTENT_NO_DIRECT 0x00000008 /* Data mapping undefined */
+#define FIEMAP_EXTENT_SECONDARY 0x00000010 /* Data copied offline. May
+ * set EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_NET 0x00000020 /* Data stored remotely.
+ * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_DATA_COMPRESSED 0x00000040 /* Data is compressed by fs.
+ * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs.
+ * Sets EXTENT_NO_DIRECT. */
+#define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be
+ * block aligned. */
+#define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata.
+ * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_DATA_TAIL 0x00000400 /* Multiple files in block.
+ * Sets EXTENT_NOT_ALIGNED.*/
+#define FIEMAP_EXTENT_UNWRITTEN 0x00000800 /* Space allocated, but
+ * no data (i.e. zero). */
+#define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively
+ * support extents. Result
+ * merged for efficiency. */
+
+#endif /* _EXT2FS_FIEMAP_H */
===================================================================
@@ -5,7 +5,7 @@ filefrag \- report on file fragmentation
.SH SYNOPSIS
.B filefrag
[
-.B \-v
+.B \-besvx
]
[
.I files...
@@ -14,11 +14,25 @@ filefrag \- report on file fragmentation
.B filefrag
reports on how badly fragmented a particular file might be. It makes
allowances for indirect blocks for ext2 and ext3 filesystems, but can be
-used on files for any filesystem.
+used on files for any filesystem. filefrag initially attempts to get the
+extent information using FIEMAP ioctl which is more efficient and faster.
+If FIEMAP is not supported then filefrag defaults to using FIBMAP.
.SH OPTIONS
.TP
+.B \-b
+Use 1024 byte blocksize for the output.
+.TP
+.B \-e
+Use extent format while printing the output.
+.TP
+.B \-s
+Sync the file before requesting the mapping.
+.TP
.B \-v
Be verbose when checking for file fragmentation.
+.TP
+.B \-x
+Display mapping of extended attributes.
.SH AUTHOR
.B filefrag
was written by Theodore Ts'o <tytso@mit.edu>.