| /* |
| * Copyright (c) 2010 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "platform_defs.h" |
| #include "command.h" |
| #include "input.h" |
| #include <linux/fiemap.h> |
| #include "init.h" |
| #include "io.h" |
| |
| #define EXTENT_BATCH 32 |
| |
| static cmdinfo_t fiemap_cmd; |
| static int max_extents = -1; |
| |
| static void |
| fiemap_help(void) |
| { |
| printf(_( |
| "\n" |
| " prints the block mapping for a file's data or attribute forks" |
| "\n" |
| " Example:\n" |
| " 'fiemap -v' - tabular format verbose map\n" |
| "\n" |
| " fiemap prints the map of disk blocks used by the current file.\n" |
| " The map lists each extent used by the file, as well as regions in the\n" |
| " file that do not have any corresponding blocks (holes).\n" |
| " By default, each line of the listing takes the following form:\n" |
| " extent: [startoffset..endoffset]: startblock..endblock\n" |
| " Holes are marked by replacing the startblock..endblock with 'hole'.\n" |
| " All the file offsets and disk blocks are in units of 512-byte blocks.\n" |
| " -a -- prints the attribute fork map instead of the data fork.\n" |
| " -l -- also displays the length of each extent in 512-byte blocks.\n" |
| " -n -- query n extents.\n" |
| " -v -- Verbose information\n" |
| "\n")); |
| } |
| |
| static void |
| print_hole( |
| int foff_w, |
| int boff_w, |
| int tot_w, |
| int cur_extent, |
| int lflag, |
| bool plain, |
| __u64 llast, |
| __u64 lstart) |
| { |
| char lbuf[48]; |
| |
| if (plain) { |
| printf("\t%d: [%llu..%llu]: hole", cur_extent, |
| (unsigned long long)llast, lstart - 1ULL); |
| if (lflag) |
| printf(_(" %llu blocks\n"), |
| (unsigned long long)lstart - llast); |
| else |
| printf("\n"); |
| } else { |
| snprintf(lbuf, sizeof(lbuf), "[%llu..%llu]:", |
| (unsigned long long)llast, lstart - 1ULL); |
| printf("%4d: %-*s %-*s %*llu\n", cur_extent, foff_w, lbuf, |
| boff_w, _("hole"), tot_w, |
| (unsigned long long)lstart - llast); |
| } |
| |
| |
| } |
| |
| static int |
| print_verbose( |
| struct fiemap_extent *extent, |
| int foff_w, |
| int boff_w, |
| int tot_w, |
| int flg_w, |
| int cur_extent, |
| __u64 last_logical) |
| { |
| __u64 lstart; |
| __u64 llast; |
| __u64 len; |
| __u64 block; |
| char lbuf[48]; |
| char bbuf[48]; |
| char flgbuf[16]; |
| |
| llast = BTOBBT(last_logical); |
| lstart = BTOBBT(extent->fe_logical); |
| len = BTOBBT(extent->fe_length); |
| block = BTOBBT(extent->fe_physical); |
| |
| memset(lbuf, 0, sizeof(lbuf)); |
| memset(bbuf, 0, sizeof(bbuf)); |
| |
| if (cur_extent == 0) { |
| printf("%4s: %-*s %-*s %*s %*s\n", _("EXT"), |
| foff_w, _("FILE-OFFSET"), |
| boff_w, _("BLOCK-RANGE"), |
| tot_w, _("TOTAL"), |
| flg_w, _("FLAGS")); |
| } |
| |
| if (lstart != llast) { |
| print_hole(foff_w, boff_w, tot_w, cur_extent, 0, false, llast, |
| lstart); |
| cur_extent++; |
| } |
| |
| if (cur_extent == max_extents) |
| return 1; |
| |
| snprintf(lbuf, sizeof(lbuf), "[%llu..%llu]:", |
| (unsigned long long)lstart, lstart + len - 1ULL); |
| snprintf(bbuf, sizeof(bbuf), "%llu..%llu", |
| (unsigned long long)block, block + len - 1ULL); |
| snprintf(flgbuf, sizeof(flgbuf), "0x%x", extent->fe_flags); |
| printf("%4d: %-*s %-*s %*llu %*s\n", cur_extent, foff_w, lbuf, |
| boff_w, bbuf, tot_w, (unsigned long long)len, flg_w, flgbuf); |
| |
| return 2; |
| } |
| |
| static int |
| print_plain( |
| struct fiemap_extent *extent, |
| int lflag, |
| int cur_extent, |
| __u64 last_logical) |
| { |
| __u64 lstart; |
| __u64 llast; |
| __u64 block; |
| __u64 len; |
| |
| llast = BTOBBT(last_logical); |
| lstart = BTOBBT(extent->fe_logical); |
| len = BTOBBT(extent->fe_length); |
| block = BTOBBT(extent->fe_physical); |
| |
| if (lstart != llast) { |
| print_hole(0, 0, 0, cur_extent, lflag, true, llast, lstart); |
| cur_extent++; |
| } |
| |
| if (cur_extent == max_extents) |
| return 1; |
| |
| printf("\t%d: [%llu..%llu]: %llu..%llu", cur_extent, |
| (unsigned long long)lstart, lstart + len - 1ULL, |
| (unsigned long long)block, block + len - 1ULL); |
| |
| if (lflag) |
| printf(_(" %llu blocks\n"), (unsigned long long)len); |
| else |
| printf("\n"); |
| return 2; |
| } |
| |
| /* |
| * Calculate the proper extent table format based on first |
| * set of extents |
| */ |
| static void |
| calc_print_format( |
| struct fiemap *fiemap, |
| int *foff_w, |
| int *boff_w, |
| int *tot_w, |
| int *flg_w) |
| { |
| int i; |
| char lbuf[32]; |
| char bbuf[32]; |
| __u64 logical; |
| __u64 block; |
| __u64 len; |
| struct fiemap_extent *extent; |
| |
| for (i = 0; i < fiemap->fm_mapped_extents; i++) { |
| |
| extent = &fiemap->fm_extents[i]; |
| logical = BTOBBT(extent->fe_logical); |
| len = BTOBBT(extent->fe_length); |
| block = BTOBBT(extent->fe_physical); |
| |
| snprintf(lbuf, sizeof(lbuf), "[%llu..%llu]", |
| (unsigned long long)logical, |
| (unsigned long long)logical + len - 1); |
| snprintf(bbuf, sizeof(bbuf), "%llu..%llu", |
| (unsigned long long)block, |
| (unsigned long long)block + len - 1); |
| *foff_w = max(*foff_w, strlen(lbuf)); |
| *boff_w = max(*boff_w, strlen(bbuf)); |
| *tot_w = max(*tot_w, numlen(len, 10)); |
| *flg_w = max(*flg_w, numlen(extent->fe_flags, 16)); |
| if (extent->fe_flags & FIEMAP_EXTENT_LAST) |
| break; |
| } |
| } |
| |
| int |
| fiemap_f( |
| int argc, |
| char **argv) |
| { |
| struct fiemap *fiemap; |
| int last = 0; |
| int lflag = 0; |
| int vflag = 0; |
| int fiemap_flags = FIEMAP_FLAG_SYNC; |
| int c; |
| int i; |
| int map_size; |
| int ret; |
| int cur_extent = 0; |
| int foff_w = 16; /* 16 just for a good minimum range */ |
| int boff_w = 16; |
| int tot_w = 5; /* 5 since its just one number */ |
| int flg_w = 5; |
| __u64 last_logical = 0; |
| struct stat st; |
| |
| while ((c = getopt(argc, argv, "aln:v")) != EOF) { |
| switch (c) { |
| case 'a': |
| fiemap_flags |= FIEMAP_FLAG_XATTR; |
| break; |
| case 'l': |
| lflag = 1; |
| break; |
| case 'n': |
| max_extents = atoi(optarg); |
| break; |
| case 'v': |
| vflag++; |
| break; |
| default: |
| return command_usage(&fiemap_cmd); |
| } |
| } |
| |
| map_size = sizeof(struct fiemap) + |
| (EXTENT_BATCH * sizeof(struct fiemap_extent)); |
| fiemap = malloc(map_size); |
| if (!fiemap) { |
| fprintf(stderr, _("%s: malloc of %d bytes failed.\n"), |
| progname, map_size); |
| exitcode = 1; |
| return 0; |
| } |
| |
| printf("%s:\n", file->name); |
| |
| while (!last && (cur_extent != max_extents)) { |
| |
| memset(fiemap, 0, map_size); |
| fiemap->fm_flags = fiemap_flags; |
| fiemap->fm_start = last_logical; |
| fiemap->fm_length = -1LL; |
| fiemap->fm_extent_count = EXTENT_BATCH; |
| |
| ret = ioctl(file->fd, FS_IOC_FIEMAP, (unsigned long)fiemap); |
| if (ret < 0) { |
| fprintf(stderr, "%s: ioctl(FS_IOC_FIEMAP) [\"%s\"]: " |
| "%s\n", progname, file->name, strerror(errno)); |
| free(fiemap); |
| exitcode = 1; |
| return 0; |
| } |
| |
| /* No more extents to map, exit */ |
| if (!fiemap->fm_mapped_extents) |
| break; |
| |
| for (i = 0; i < fiemap->fm_mapped_extents; i++) { |
| struct fiemap_extent *extent; |
| int num_printed = 0; |
| |
| extent = &fiemap->fm_extents[i]; |
| if (vflag) { |
| if (cur_extent == 0) { |
| calc_print_format(fiemap, &foff_w, |
| &boff_w, &tot_w, |
| &flg_w); |
| } |
| |
| num_printed = print_verbose(extent, foff_w, |
| boff_w, tot_w, |
| flg_w, cur_extent, |
| last_logical); |
| } else |
| num_printed = print_plain(extent, lflag, |
| cur_extent, |
| last_logical); |
| |
| cur_extent += num_printed; |
| last_logical = extent->fe_logical + extent->fe_length; |
| |
| if (extent->fe_flags & FIEMAP_EXTENT_LAST) { |
| last = 1; |
| break; |
| } |
| |
| if (cur_extent == max_extents) |
| break; |
| } |
| } |
| |
| if (cur_extent == max_extents) |
| goto out; |
| |
| memset(&st, 0, sizeof(st)); |
| if (fstat(file->fd, &st)) { |
| fprintf(stderr, "%s: fstat failed: %s\n", progname, |
| strerror(errno)); |
| free(fiemap); |
| exitcode = 1; |
| return 0; |
| } |
| |
| if (cur_extent && last_logical < st.st_size) |
| print_hole(foff_w, boff_w, tot_w, cur_extent, lflag, !vflag, |
| BTOBBT(last_logical), BTOBBT(st.st_size)); |
| |
| out: |
| free(fiemap); |
| return 0; |
| } |
| |
| void |
| fiemap_init(void) |
| { |
| fiemap_cmd.name = "fiemap"; |
| fiemap_cmd.cfunc = fiemap_f; |
| fiemap_cmd.argmin = 0; |
| fiemap_cmd.argmax = -1; |
| fiemap_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK; |
| fiemap_cmd.args = _("[-alv] [-n nx]"); |
| fiemap_cmd.oneline = _("print block mapping for a file"); |
| fiemap_cmd.help = fiemap_help; |
| |
| add_command(&fiemap_cmd); |
| } |