mirror of https://github.com/vitalif/e2fsprogs
413 lines
9.4 KiB
C
413 lines
9.4 KiB
C
/*
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* filefrag.c -- report if a particular file is fragmented
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*
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* Copyright 2003 by Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include "config.h"
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#ifndef __linux__
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int main(void) {
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fputs("This program is only supported on Linux!\n", stderr);
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exit(EXIT_FAILURE);
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}
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#else
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#define _LARGEFILE64_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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extern char *optarg;
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extern int optind;
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <sys/ioctl.h>
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#include <linux/fd.h>
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#include <ext2fs/ext2_types.h>
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#include <ext2fs/fiemap.h>
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int verbose = 0;
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int no_bs = 0; /* Don't use the files blocksize, use 1K blocksize */
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int sync_file = 0; /* fsync file before getting the mapping */
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int xattr_map = 0; /* get xattr mapping */
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int force_bmap = 0;
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int logical_width = 12;
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int physical_width = 14;
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unsigned long long filesize;
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#define FILEFRAG_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
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#define FIBMAP _IO(0x00, 1) /* bmap access */
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#define FIGETBSZ _IO(0x00, 2) /* get the block size used for bmap */
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#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
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#define EXT3_IOC_GETFLAGS _IOR('f', 1, long)
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static int int_log2(int arg)
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{
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int l = 0;
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arg >>= 1;
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while (arg) {
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l++;
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arg >>= 1;
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}
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return l;
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}
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static int int_log10(unsigned long long arg)
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{
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int l = 0;
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arg = arg / 10;
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while (arg) {
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l++;
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arg = arg / 10;
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}
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return l;
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}
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static unsigned int div_ceil(unsigned int a, unsigned int b)
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{
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if (!a)
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return 0;
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return ((a - 1) / b) + 1;
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}
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static int get_bmap(int fd, unsigned long block, unsigned long *phy_blk)
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{
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int ret;
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unsigned int b;
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b = block;
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ret = ioctl(fd, FIBMAP, &b); /* FIBMAP takes pointer to integer */
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if (ret < 0) {
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if (errno == EPERM) {
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fprintf(stderr, "No permission to use FIBMAP ioctl; "
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"must have root privileges\n");
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exit(1);
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}
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perror("FIBMAP");
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}
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*phy_blk = b;
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return ret;
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}
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static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
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unsigned long long expected, int blk_shift)
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{
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__u64 phy_blk;
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unsigned long long logical_blk;
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unsigned long ext_len;
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char flags[256] = "";
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/* For inline data all offsets should be in terms of bytes, not blocks */
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if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
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blk_shift = 0;
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ext_len = fm_extent->fe_length >> blk_shift;
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logical_blk = fm_extent->fe_logical >> blk_shift;
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phy_blk = fm_extent->fe_physical >> blk_shift;
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if (fm_extent->fe_flags & FIEMAP_EXTENT_UNKNOWN)
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strcat(flags, "unknown,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_DELALLOC)
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strcat(flags, "delalloc,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_ENCRYPTED)
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strcat(flags, "encrypted,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_NOT_ALIGNED)
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strcat(flags, "not_aligned,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_INLINE)
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strcat(flags, "inline,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_DATA_TAIL)
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strcat(flags, "tail_packed,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)
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strcat(flags, "unwritten,");
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if (fm_extent->fe_flags & FIEMAP_EXTENT_MERGED)
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strcat(flags, "merged,");
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if (fm_extent->fe_logical + fm_extent->fe_length >= filesize)
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strcat(flags, "eof,");
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/* Remove trailing comma, if any */
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if (flags[0])
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flags[strlen(flags) - 1] = '\0';
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if (expected)
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printf("%4d %*llu %*llu %*llu %6lu %s\n",
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cur_ex, logical_width, logical_blk,
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physical_width, phy_blk, physical_width, expected,
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ext_len, flags);
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else
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printf("%4d %*llu %*llu %*s %6lu %s\n",
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cur_ex, logical_width, logical_blk,
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physical_width, phy_blk, physical_width, "",
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ext_len, flags);
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}
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static int filefrag_fiemap(int fd, int blk_shift, int *num_extents)
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{
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char buf[4096] = "";
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struct fiemap *fiemap = (struct fiemap *)buf;
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struct fiemap_extent *fm_ext = &fiemap->fm_extents[0];
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int count = (sizeof(buf) - sizeof(*fiemap)) /
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sizeof(struct fiemap_extent);
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unsigned long long expected = 0;
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unsigned long flags = 0;
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unsigned int i;
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static int fiemap_incompat_printed;
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int fiemap_header_printed = 0;
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int tot_extents = 0, n = 0;
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int last = 0;
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int rc;
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memset(fiemap, 0, sizeof(struct fiemap));
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if (sync_file)
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flags |= FIEMAP_FLAG_SYNC;
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if (xattr_map)
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flags |= FIEMAP_FLAG_XATTR;
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do {
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fiemap->fm_length = ~0ULL;
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fiemap->fm_flags = flags;
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fiemap->fm_extent_count = count;
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rc = ioctl(fd, FS_IOC_FIEMAP, (unsigned long) fiemap);
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if (rc < 0) {
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if (errno == EBADR && fiemap_incompat_printed == 0) {
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printf("FIEMAP failed with unsupported "
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"flags %x\n", fiemap->fm_flags);
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fiemap_incompat_printed = 1;
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}
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return rc;
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}
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/* If 0 extents are returned, then more ioctls are not needed */
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if (fiemap->fm_mapped_extents == 0)
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break;
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if (verbose && !fiemap_header_printed) {
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printf(" ext %*s %*s %*s length flags\n", logical_width,
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"logical", physical_width, "physical",
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physical_width, "expected");
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fiemap_header_printed = 1;
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}
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for (i = 0; i < fiemap->fm_mapped_extents; i++) {
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__u64 phy_blk, logical_blk;
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unsigned long ext_len;
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phy_blk = fm_ext[i].fe_physical >> blk_shift;
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ext_len = fm_ext[i].fe_length >> blk_shift;
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logical_blk = fm_ext[i].fe_logical >> blk_shift;
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if (logical_blk && phy_blk != expected) {
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tot_extents++;
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} else {
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expected = 0;
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if (!tot_extents)
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tot_extents = 1;
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}
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if (verbose)
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print_extent_info(&fm_ext[i], n, expected,
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blk_shift);
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expected = phy_blk + ext_len;
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if (fm_ext[i].fe_flags & FIEMAP_EXTENT_LAST)
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last = 1;
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n++;
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}
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fiemap->fm_start = (fm_ext[i-1].fe_logical +
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fm_ext[i-1].fe_length);
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} while (last == 0);
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*num_extents = tot_extents;
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out:
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return 0;
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}
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#define EXT2_DIRECT 12
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static void frag_report(const char *filename)
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{
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struct statfs fsinfo;
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#ifdef HAVE_FSTAT64
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struct stat64 fileinfo;
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#else
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struct stat fileinfo;
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#endif
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int bs;
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long fd;
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unsigned long block, last_block = 0, numblocks, i, count = 0;
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long bpib; /* Blocks per indirect block */
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long cylgroups;
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int num_extents = 0, expected;
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int is_ext2 = 0;
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static int once = 1;
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unsigned int flags;
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int rc;
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#ifdef HAVE_OPEN64
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fd = open64(filename, O_RDONLY);
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#else
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fd = open(filename, O_RDONLY);
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#endif
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if (fd < 0) {
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perror("open");
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return;
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}
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if (statfs(filename, &fsinfo) < 0) {
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perror("statfs");
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return;
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}
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#ifdef HAVE_FSTAT64
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if (stat64(filename, &fileinfo) < 0) {
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#else
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if (stat(filename, &fileinfo) < 0) {
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#endif
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perror("stat");
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return;
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}
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if (ioctl(fd, EXT3_IOC_GETFLAGS, &flags) < 0)
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flags = 0;
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if (!(flags & EXT4_EXTENTS_FL) &&
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((fsinfo.f_type == 0xef51) || (fsinfo.f_type == 0xef52) ||
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(fsinfo.f_type == 0xef53)))
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is_ext2++;
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if (verbose && once)
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printf("Filesystem type is: %lx\n",
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(unsigned long) fsinfo.f_type);
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cylgroups = div_ceil(fsinfo.f_blocks, fsinfo.f_bsize*8);
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if (verbose && is_ext2 && once)
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printf("Filesystem cylinder groups is approximately %ld\n",
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cylgroups);
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physical_width = int_log10(fsinfo.f_blocks);
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if (physical_width < 8)
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physical_width = 8;
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if (ioctl(fd, FIGETBSZ, &bs) < 0) { /* FIGETBSZ takes an int */
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perror("FIGETBSZ");
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close(fd);
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return;
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}
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if (no_bs)
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bs = 1024;
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bpib = bs / 4;
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numblocks = (fileinfo.st_size + (bs-1)) / bs;
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logical_width = int_log10(numblocks);
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if (logical_width < 7)
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logical_width = 7;
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filesize = (long long)fileinfo.st_size;
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if (verbose)
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printf("File size of %s is %lld (%ld block%s, blocksize %d)\n",
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filename, (long long) fileinfo.st_size, numblocks,
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numblocks == 1 ? "" : "s", bs);
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if (force_bmap ||
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filefrag_fiemap(fd, int_log2(bs), &num_extents) != 0) {
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for (i = 0, count = 0; i < numblocks; i++) {
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if (is_ext2 && last_block) {
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if (((i-EXT2_DIRECT) % bpib) == 0)
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last_block++;
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if (((i-EXT2_DIRECT-bpib) % (bpib*bpib)) == 0)
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last_block++;
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if (((i-EXT2_DIRECT-bpib-bpib*bpib) %
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(((__u64) bpib)*bpib*bpib)) == 0)
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last_block++;
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}
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rc = get_bmap(fd, i, &block);
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if (block == 0)
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continue;
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if (!num_extents)
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num_extents++;
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count++;
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if (last_block && (block != last_block+1) ) {
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if (verbose)
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printf("Discontinuity: Block %ld is at "
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"%lu (was %lu)\n",
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i, block, last_block+1);
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num_extents++;
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}
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last_block = block;
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}
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}
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if (num_extents == 1)
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printf("%s: 1 extent found", filename);
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else
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printf("%s: %d extents found", filename, num_extents);
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/* count, and thus expected, only set for indirect FIBMAP'd files */
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if (is_ext2) {
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expected = (count/((bs*8)-(fsinfo.f_files/8/cylgroups)-3))+1;
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if (expected && expected < num_extents)
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printf(", perfection would be %d extent%s\n", expected,
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(expected>1) ? "s" : "");
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} else
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fputc('\n', stdout);
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close(fd);
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once = 0;
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}
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static void usage(const char *progname)
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{
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fprintf(stderr, "Usage: %s [-Bbvsx] file ...\n", progname);
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exit(1);
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}
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int main(int argc, char**argv)
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{
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char **cpp;
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int c;
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while ((c = getopt(argc, argv, "Bbsvx")) != EOF)
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switch (c) {
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case 'B':
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force_bmap++;
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break;
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case 'b':
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no_bs++;
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break;
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case 'v':
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verbose++;
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break;
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case 's':
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sync_file++;
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break;
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case 'x':
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xattr_map++;
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break;
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default:
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usage(argv[0]);
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break;
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}
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if (optind == argc)
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usage(argv[0]);
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for (cpp=argv+optind; *cpp; cpp++)
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frag_report(*cpp);
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return 0;
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}
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#endif
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