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-rw-r--r--misc/e2freefrag.c452
1 files changed, 452 insertions, 0 deletions
diff --git a/misc/e2freefrag.c b/misc/e2freefrag.c
new file mode 100644
index 0000000..49b6346
--- /dev/null
+++ b/misc/e2freefrag.c
@@ -0,0 +1,452 @@
+/*
+ * e2freefrag - report filesystem free-space fragmentation
+ *
+ * Copyright (C) 2009 Sun Microsystems, Inc.
+ *
+ * Author: Rupesh Thakare <rupesh@sun.com>
+ * Andreas Dilger <adilger@sun.com>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License version 2.
+ * %End-Header%
+ */
+#include "config.h"
+#include <stdio.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern char *optarg;
+extern int optind;
+#endif
+#if defined(HAVE_EXT2_IOCTLS) && !defined(DEBUGFS)
+# include <sys/ioctl.h>
+# include <sys/types.h>
+# include <sys/stat.h>
+# include <fcntl.h>
+# include <limits.h>
+#endif
+
+#include "ext2fs/ext2_fs.h"
+#include "ext2fs/ext2fs.h"
+#include "e2freefrag.h"
+
+#if defined(HAVE_EXT2_IOCTLS) && !defined(DEBUGFS)
+# ifdef HAVE_LINUX_FSMAP_H
+# include <linux/fsmap.h>
+# endif
+# include "fsmap.h"
+#endif
+
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+static void usage(const char *prog)
+{
+ fprintf(stderr, "usage: %s [-c chunksize in kb] [-h] "
+ "device_name\n", prog);
+#ifndef DEBUGFS
+ exit(1);
+#endif
+}
+
+static int ul_log2(unsigned long arg)
+{
+ int l = 0;
+
+ arg >>= 1;
+ while (arg) {
+ l++;
+ arg >>= 1;
+ }
+ return l;
+}
+
+static void init_chunk_info(ext2_filsys fs, struct chunk_info *info)
+{
+ int i;
+
+ info->blocksize_bits = ul_log2((unsigned long)fs->blocksize);
+ if (info->chunkbytes) {
+ info->chunkbits = ul_log2(info->chunkbytes);
+ info->blks_in_chunk = info->chunkbytes >> info->blocksize_bits;
+ } else {
+ info->chunkbits = ul_log2(DEFAULT_CHUNKSIZE);
+ info->blks_in_chunk = DEFAULT_CHUNKSIZE >> info->blocksize_bits;
+ }
+
+ info->min = ~0UL;
+ info->max = info->avg = 0;
+ info->real_free_chunks = 0;
+
+ for (i = 0; i < MAX_HIST; i++) {
+ info->histogram.fc_chunks[i] = 0;
+ info->histogram.fc_blocks[i] = 0;
+ }
+}
+
+static void update_chunk_stats(struct chunk_info *info,
+ unsigned long chunk_size)
+{
+ unsigned long idx;
+
+ idx = ul_log2(chunk_size) + 1;
+ if (idx >= MAX_HIST)
+ idx = MAX_HIST-1;
+ info->histogram.fc_chunks[idx]++;
+ info->histogram.fc_blocks[idx] += chunk_size;
+
+ if (chunk_size > info->max)
+ info->max = chunk_size;
+ if (chunk_size < info->min)
+ info->min = chunk_size;
+ info->avg += chunk_size;
+ info->real_free_chunks++;
+}
+
+static void scan_block_bitmap(ext2_filsys fs, struct chunk_info *info)
+{
+ unsigned long long blocks_count = ext2fs_blocks_count(fs->super);
+ unsigned long long chunks = (blocks_count + info->blks_in_chunk) >>
+ (info->chunkbits - info->blocksize_bits);
+ unsigned long long chunk_num;
+ unsigned long last_chunk_size = 0;
+ unsigned long long chunk_start_blk = 0;
+ int used;
+
+ for (chunk_num = 0; chunk_num < chunks; chunk_num++) {
+ unsigned long long blk, num_blks;
+ int chunk_free;
+
+ /* Last chunk may be smaller */
+ if (chunk_start_blk + info->blks_in_chunk > blocks_count)
+ num_blks = blocks_count - chunk_start_blk;
+ else
+ num_blks = info->blks_in_chunk;
+
+ chunk_free = 0;
+
+ /* Initialize starting block for first chunk correctly else
+ * there is a segfault when blocksize = 1024 in which case
+ * block_map->start = 1 */
+ for (blk = 0; blk < num_blks; blk++, chunk_start_blk++) {
+ if (chunk_num == 0 && blk == 0) {
+ blk = fs->super->s_first_data_block;
+ chunk_start_blk = blk;
+ }
+ used = ext2fs_fast_test_block_bitmap2(fs->block_map,
+ chunk_start_blk >> fs->cluster_ratio_bits);
+ if (!used) {
+ last_chunk_size++;
+ chunk_free++;
+ }
+
+ if (used && last_chunk_size != 0) {
+ update_chunk_stats(info, last_chunk_size);
+ last_chunk_size = 0;
+ }
+ }
+
+ if (chunk_free == info->blks_in_chunk)
+ info->free_chunks++;
+ }
+ if (last_chunk_size != 0)
+ update_chunk_stats(info, last_chunk_size);
+}
+
+#if defined(HAVE_EXT2_IOCTLS) && !defined(DEBUGFS)
+# define FSMAP_EXTENTS 1024
+static int scan_online(ext2_filsys fs, struct chunk_info *info,
+ blk64_t *free_blks)
+{
+ struct fsmap_head *fsmap;
+ struct fsmap *extent;
+ struct fsmap *p;
+ char mntpoint[PATH_MAX + 1];
+ errcode_t retval;
+ int mount_flags;
+ int fd;
+ int ret;
+ unsigned int i;
+
+ /* Try to open the mountpoint for a live query. */
+ retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
+ mntpoint, PATH_MAX);
+ if (retval) {
+ com_err(fs->device_name, retval, "while checking mount status");
+ return 0;
+ }
+ if (!(mount_flags & EXT2_MF_MOUNTED))
+ return 0;
+ fd = open(mntpoint, O_RDONLY);
+ if (fd < 0) {
+ com_err(mntpoint, errno, "while opening mount point");
+ return 0;
+ }
+
+ fsmap = malloc(fsmap_sizeof(FSMAP_EXTENTS));
+ if (!fsmap) {
+ com_err(fs->device_name, errno, "while allocating memory");
+ return 0;
+ }
+
+ memset(fsmap, 0, sizeof(*fsmap));
+ fsmap->fmh_count = FSMAP_EXTENTS;
+ fsmap->fmh_keys[1].fmr_device = UINT_MAX;
+ fsmap->fmh_keys[1].fmr_physical = ULLONG_MAX;
+ fsmap->fmh_keys[1].fmr_owner = ULLONG_MAX;
+ fsmap->fmh_keys[1].fmr_offset = ULLONG_MAX;
+ fsmap->fmh_keys[1].fmr_flags = UINT_MAX;
+
+ *free_blks = 0;
+ /* Fill the extent histogram with live data */
+ while (1) {
+ ret = ioctl(fd, FS_IOC_GETFSMAP, fsmap);
+ if (ret < 0) {
+ com_err(fs->device_name, errno, "while calling fsmap");
+ free(fsmap);
+ return 0;
+ }
+
+ /* No more extents to map, exit */
+ if (!fsmap->fmh_entries)
+ break;
+
+ for (i = 0, extent = fsmap->fmh_recs;
+ i < fsmap->fmh_entries;
+ i++, extent++) {
+ if (!(extent->fmr_flags & FMR_OF_SPECIAL_OWNER) ||
+ extent->fmr_owner != FMR_OWN_FREE)
+ continue;
+ update_chunk_stats(info,
+ extent->fmr_length / fs->blocksize);
+ *free_blks += (extent->fmr_length / fs->blocksize);
+ }
+
+ p = &fsmap->fmh_recs[fsmap->fmh_entries - 1];
+ if (p->fmr_flags & FMR_OF_LAST)
+ break;
+ fsmap_advance(fsmap);
+ }
+ free(fsmap);
+ return 1;
+}
+#else
+# define scan_online(fs, info, free_blks) (0)
+#endif /* HAVE_EXT2_IOCTLS */
+
+static errcode_t scan_offline(ext2_filsys fs, struct chunk_info *info,
+ blk64_t *free_blks)
+{
+ errcode_t retval;
+
+ *free_blks = ext2fs_free_blocks_count(fs->super);
+ retval = ext2fs_read_block_bitmap(fs);
+ if (retval)
+ return retval;
+ scan_block_bitmap(fs, info);
+ return 0;
+}
+
+static errcode_t dump_chunk_info(ext2_filsys fs, struct chunk_info *info,
+ FILE *f, blk64_t free_blks)
+{
+ unsigned long total_chunks;
+ const char *unitp = "KMGTPEZY";
+ int units = 10;
+ unsigned long start = 0, end;
+ int i, retval = 0;
+
+ fprintf(f, "Total blocks: %llu\nFree blocks: %llu (%0.1f%%)\n",
+ (unsigned long long) ext2fs_blocks_count(fs->super),
+ (unsigned long long) free_blks,
+ (double)free_blks * 100 /
+ ext2fs_blocks_count(fs->super));
+
+ if (info->chunkbytes) {
+ fprintf(f, "\nChunksize: %lu bytes (%u blocks)\n",
+ info->chunkbytes, info->blks_in_chunk);
+ total_chunks = (ext2fs_blocks_count(fs->super) +
+ info->blks_in_chunk) >>
+ (info->chunkbits - info->blocksize_bits);
+ fprintf(f, "Total chunks: %lu\nFree chunks: %lu (%0.1f%%)\n",
+ total_chunks, info->free_chunks,
+ (double)info->free_chunks * 100 / total_chunks);
+ }
+
+ /* Display chunk information in KB */
+ if (info->real_free_chunks) {
+ unsigned int scale = fs->blocksize >> 10;
+ info->min = info->min * scale;
+ info->max = info->max * scale;
+ info->avg = info->avg / info->real_free_chunks * scale;
+ } else {
+ info->min = 0;
+ }
+
+ fprintf(f, "\nMin. free extent: %lu KB \nMax. free extent: %lu KB\n"
+ "Avg. free extent: %lu KB\n", info->min, info->max, info->avg);
+ fprintf(f, "Num. free extent: %lu\n", info->real_free_chunks);
+
+ fprintf(f, "\nHISTOGRAM OF FREE EXTENT SIZES:\n");
+ fprintf(f, "%s : %12s %12s %7s\n", "Extent Size Range",
+ "Free extents", "Free Blocks", "Percent");
+ for (i = 0; i < MAX_HIST; i++) {
+ end = 1 << (i + info->blocksize_bits - units);
+ if (info->histogram.fc_chunks[i] != 0) {
+ char end_str[32];
+
+ sprintf(end_str, "%5lu%c-", end, *unitp);
+ if (i == MAX_HIST-1)
+ strcpy(end_str, "max ");
+ fprintf(f, "%5lu%c...%7s : %12lu %12lu %6.2f%%\n",
+ start, *unitp, end_str,
+ info->histogram.fc_chunks[i],
+ info->histogram.fc_blocks[i],
+ (double)info->histogram.fc_blocks[i] * 100 /
+ free_blks);
+ }
+ start = end;
+ if (start == 1<<10) {
+ start = 1;
+ units += 10;
+ unitp++;
+ }
+ }
+
+ return retval;
+}
+
+static void close_device(char *device_name, ext2_filsys fs)
+{
+ int retval = ext2fs_close_free(&fs);
+
+ if (retval)
+ com_err(device_name, retval, "while closing the filesystem.\n");
+}
+
+static void collect_info(ext2_filsys fs, struct chunk_info *chunk_info, FILE *f)
+{
+ unsigned int retval = 0;
+ blk64_t free_blks = 0;
+
+ fprintf(f, "Device: %s\n", fs->device_name);
+ fprintf(f, "Blocksize: %u bytes\n", fs->blocksize);
+
+ init_chunk_info(fs, chunk_info);
+ if (!scan_online(fs, chunk_info, &free_blks)) {
+ init_chunk_info(fs, chunk_info);
+ retval = scan_offline(fs, chunk_info, &free_blks);
+ }
+ if (retval) {
+ com_err(fs->device_name, retval, "while reading block bitmap");
+ close_device(fs->device_name, fs);
+ exit(1);
+ }
+
+ retval = dump_chunk_info(fs, chunk_info, f, free_blks);
+ if (retval) {
+ com_err(fs->device_name, retval, "while dumping chunk info");
+ close_device(fs->device_name, fs);
+ exit(1);
+ }
+}
+
+#ifndef DEBUGFS
+static void open_device(char *device_name, ext2_filsys *fs)
+{
+ int retval;
+ int flag = EXT2_FLAG_FORCE | EXT2_FLAG_64BITS | EXT2_FLAG_THREADS;
+
+ retval = ext2fs_open(device_name, flag, 0, 0, unix_io_manager, fs);
+ if (retval) {
+ com_err(device_name, retval, "while opening filesystem");
+ exit(1);
+ }
+ (*fs)->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
+}
+#endif
+
+#ifdef DEBUGFS
+#include "debugfs.h"
+
+void do_freefrag(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+ void *infop EXT2FS_ATTR((unused)))
+#else
+int main(int argc, char *argv[])
+#endif
+{
+ struct chunk_info chunk_info;
+ ext2_filsys fs = NULL;
+ char *progname;
+ char *end;
+ int c;
+
+#ifdef DEBUGFS
+ if (check_fs_open(argv[0]))
+ return;
+ reset_getopt();
+#else
+ char *device_name;
+
+ add_error_table(&et_ext2_error_table);
+#endif
+ progname = argv[0];
+ memset(&chunk_info, 0, sizeof(chunk_info));
+
+ while ((c = getopt(argc, argv, "c:h")) != EOF) {
+ switch (c) {
+ case 'c':
+ chunk_info.chunkbytes = strtoull(optarg, &end, 0);
+ if (*end != '\0') {
+ fprintf(stderr, "%s: bad chunk size '%s'\n",
+ progname, optarg);
+ usage(progname);
+ }
+ if (chunk_info.chunkbytes &
+ (chunk_info.chunkbytes - 1)) {
+ fprintf(stderr, "%s: chunk size must be a "
+ "power of 2.\n", argv[0]);
+ usage(progname);
+ }
+ chunk_info.chunkbytes *= 1024;
+ break;
+ case 'h':
+ default:
+ usage(progname);
+ break;
+ }
+ }
+
+#ifndef DEBUGFS
+ if (optind == argc) {
+ fprintf(stderr, "%s: missing device name.\n", progname);
+ usage(progname);
+ }
+
+ device_name = argv[optind];
+
+ open_device(device_name, &fs);
+#else
+ fs = current_fs;
+#endif
+
+ if (chunk_info.chunkbytes && (chunk_info.chunkbytes < fs->blocksize)) {
+ fprintf(stderr, "%s: chunksize must be greater than or equal "
+ "to filesystem blocksize.\n", progname);
+ exit(1);
+ }
+ collect_info(fs, &chunk_info, stdout);
+#ifndef DEBUGFS
+ close_device(device_name, fs);
+
+ return 0;
+#endif
+}
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