ad31bf0c64
Copy from filesystems/btrfsprogs based on submit request 34400 from user coolo OBS-URL: https://build.opensuse.org/request/show/34400 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/btrfsprogs?expand=0&rev=8
272 lines
6.7 KiB
Diff
272 lines
6.7 KiB
Diff
From ab8fb4c99516c186641bda1dbc0e788f68b4dc77 Mon Sep 17 00:00:00 2001
|
|
From: Chris Mason <chris.mason@oracle.com>
|
|
Date: Thu, 12 Nov 2009 14:34:09 -0500
|
|
Subject: [PATCH 4/4] Add btrfs-map-logical program to map and read logical block numbers
|
|
|
|
This allows us to figure out which physical byte offset on which device
|
|
is the real location for a given logical block number. It can
|
|
optionally read the block in and save it to a file for debugging
|
|
analysis.
|
|
|
|
Signed-off-by: Chris Mason <chris.mason@oracle.com>
|
|
---
|
|
Makefile | 6 +-
|
|
btrfs-map-logical.c | 221 +++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
2 files changed, 226 insertions(+), 1 deletions(-)
|
|
create mode 100644 btrfs-map-logical.c
|
|
|
|
diff --git a/Makefile b/Makefile
|
|
index 8097b5a..02f881e 100644
|
|
--- a/Makefile
|
|
+++ b/Makefile
|
|
@@ -16,7 +16,8 @@ prefix ?= /usr/local
|
|
bindir = $(prefix)/bin
|
|
LIBS=-luuid
|
|
|
|
-progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck
|
|
+progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \
|
|
+ btrfs-map-logical
|
|
|
|
# make C=1 to enable sparse
|
|
ifdef C
|
|
@@ -56,6 +57,9 @@ btrfs-debug-tree: $(objects) debug-tree.o
|
|
btrfstune: $(objects) btrfstune.o
|
|
gcc $(CFLAGS) -o btrfstune $(objects) btrfstune.o $(LDFLAGS) $(LIBS)
|
|
|
|
+btrfs-map-logical: $(objects) btrfs-map-logical.o
|
|
+ gcc $(CFLAGS) -o btrfs-map-logical $(objects) btrfs-map-logical.o $(LDFLAGS) $(LIBS)
|
|
+
|
|
btrfs-image: $(objects) btrfs-image.o
|
|
gcc $(CFLAGS) -o btrfs-image $(objects) btrfs-image.o -lpthread -lz $(LDFLAGS) $(LIBS)
|
|
|
|
diff --git a/btrfs-map-logical.c b/btrfs-map-logical.c
|
|
new file mode 100644
|
|
index 0000000..a109c6a
|
|
--- /dev/null
|
|
+++ b/btrfs-map-logical.c
|
|
@@ -0,0 +1,221 @@
|
|
+/*
|
|
+ * Copyright (C) 2009 Oracle. 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 v2 as published by the Free Software Foundation.
|
|
+ *
|
|
+ * This program is distributed in the hope that it will 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 to the
|
|
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
+ * Boston, MA 021110-1307, USA.
|
|
+ */
|
|
+
|
|
+#define _XOPEN_SOURCE 500
|
|
+#define _GNU_SOURCE 1
|
|
+#include <stdio.h>
|
|
+#include <stdlib.h>
|
|
+#include <fcntl.h>
|
|
+#include <unistd.h>
|
|
+#include <getopt.h>
|
|
+#include "kerncompat.h"
|
|
+#include "ctree.h"
|
|
+#include "volumes.h"
|
|
+#include "disk-io.h"
|
|
+#include "print-tree.h"
|
|
+#include "transaction.h"
|
|
+#include "list.h"
|
|
+#include "version.h"
|
|
+
|
|
+/* we write the mirror info to stdout unless they are dumping the data
|
|
+ * to stdout
|
|
+ * */
|
|
+static FILE *info_file;
|
|
+
|
|
+struct extent_buffer *debug_read_block(struct btrfs_root *root, u64 bytenr,
|
|
+ u32 blocksize, int copy)
|
|
+{
|
|
+ int ret;
|
|
+ int dev_nr;
|
|
+ struct extent_buffer *eb;
|
|
+ u64 length;
|
|
+ struct btrfs_multi_bio *multi = NULL;
|
|
+ struct btrfs_device *device;
|
|
+ int num_copies;
|
|
+ int mirror_num = 1;
|
|
+
|
|
+ eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
|
|
+ if (!eb)
|
|
+ return NULL;
|
|
+
|
|
+ dev_nr = 0;
|
|
+ length = blocksize;
|
|
+ while (1) {
|
|
+ ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
|
|
+ eb->start, &length, &multi, mirror_num);
|
|
+ BUG_ON(ret);
|
|
+ device = multi->stripes[0].dev;
|
|
+ eb->fd = device->fd;
|
|
+ device->total_ios++;
|
|
+ eb->dev_bytenr = multi->stripes[0].physical;
|
|
+
|
|
+ fprintf(info_file, "mirror %d logical %Lu physical %Lu "
|
|
+ "device %s\n", mirror_num, bytenr, eb->dev_bytenr,
|
|
+ device->name);
|
|
+ kfree(multi);
|
|
+
|
|
+ if (!copy || mirror_num == copy)
|
|
+ ret = read_extent_from_disk(eb);
|
|
+
|
|
+ num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
|
|
+ eb->start, eb->len);
|
|
+ if (num_copies == 1)
|
|
+ break;
|
|
+
|
|
+ mirror_num++;
|
|
+ if (mirror_num > num_copies)
|
|
+ break;
|
|
+ }
|
|
+ return eb;
|
|
+}
|
|
+
|
|
+static void print_usage(void)
|
|
+{
|
|
+ fprintf(stderr, "usage: btrfs-map-logical [options] mount_point\n");
|
|
+ fprintf(stderr, "\t-l Logical extent to map\n");
|
|
+ fprintf(stderr, "\t-c Copy of the extent to read (usually 1 or 2)\n");
|
|
+ fprintf(stderr, "\t-o Output file to hold the extent\n");
|
|
+ fprintf(stderr, "\t-s Number of bytes to read\n");
|
|
+ exit(1);
|
|
+}
|
|
+
|
|
+static struct option long_options[] = {
|
|
+ /* { "byte-count", 1, NULL, 'b' }, */
|
|
+ { "logical", 1, NULL, 'l' },
|
|
+ { "copy", 1, NULL, 'c' },
|
|
+ { "output", 1, NULL, 'c' },
|
|
+ { "bytes", 1, NULL, 'b' },
|
|
+ { 0, 0, 0, 0}
|
|
+};
|
|
+
|
|
+int main(int ac, char **av)
|
|
+{
|
|
+ struct cache_tree root_cache;
|
|
+ struct btrfs_root *root;
|
|
+ struct extent_buffer *eb;
|
|
+ char *dev;
|
|
+ char *output_file = NULL;
|
|
+ u64 logical = 0;
|
|
+ int ret = 0;
|
|
+ int option_index = 0;
|
|
+ int copy = 0;
|
|
+ u64 bytes = 0;
|
|
+ int out_fd = 0;
|
|
+ int err;
|
|
+
|
|
+ while(1) {
|
|
+ int c;
|
|
+ c = getopt_long(ac, av, "l:c:o:b:", long_options,
|
|
+ &option_index);
|
|
+ if (c < 0)
|
|
+ break;
|
|
+ switch(c) {
|
|
+ case 'l':
|
|
+ logical = atoll(optarg);
|
|
+ if (logical == 0) {
|
|
+ fprintf(stderr,
|
|
+ "invalid extent number\n");
|
|
+ print_usage();
|
|
+ }
|
|
+ break;
|
|
+ case 'c':
|
|
+ copy = atoi(optarg);
|
|
+ if (copy == 0) {
|
|
+ fprintf(stderr,
|
|
+ "invalid copy number\n");
|
|
+ print_usage();
|
|
+ }
|
|
+ break;
|
|
+ case 'b':
|
|
+ bytes = atoll(optarg);
|
|
+ if (bytes == 0) {
|
|
+ fprintf(stderr,
|
|
+ "invalid byte count\n");
|
|
+ print_usage();
|
|
+ }
|
|
+ break;
|
|
+ case 'o':
|
|
+ output_file = strdup(optarg);
|
|
+ break;
|
|
+ default:
|
|
+ print_usage();
|
|
+ }
|
|
+ }
|
|
+ ac = ac - optind;
|
|
+ if (ac == 0)
|
|
+ print_usage();
|
|
+ if (logical == 0)
|
|
+ print_usage();
|
|
+ if (copy < 0)
|
|
+ print_usage();
|
|
+
|
|
+ dev = av[optind];
|
|
+
|
|
+ radix_tree_init();
|
|
+ cache_tree_init(&root_cache);
|
|
+
|
|
+ root = open_ctree(dev, 0, 0);
|
|
+ if (!root) {
|
|
+ fprintf(stderr, "Open ctree failed\n");
|
|
+ exit(1);
|
|
+ }
|
|
+
|
|
+ if (output_file) {
|
|
+ if (strcmp(output_file, "-") == 0) {
|
|
+ out_fd = 1;
|
|
+ info_file = stderr;
|
|
+ } else {
|
|
+ out_fd = open(output_file, O_RDWR | O_CREAT, 0600);
|
|
+ if (out_fd < 0)
|
|
+ goto close;
|
|
+ err = ftruncate(out_fd, 0);
|
|
+ if (err) {
|
|
+ close(out_fd);
|
|
+ goto close;
|
|
+ }
|
|
+ info_file = stdout;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (bytes == 0)
|
|
+ bytes = root->sectorsize;
|
|
+
|
|
+ bytes = (bytes + root->sectorsize - 1) / root->sectorsize;
|
|
+ bytes *= root->sectorsize;
|
|
+
|
|
+ while (bytes > 0) {
|
|
+ eb = debug_read_block(root, logical, root->sectorsize, copy);
|
|
+ if (eb && output_file) {
|
|
+ err = write(out_fd, eb->data, eb->len);
|
|
+ if (err < 0 || err != eb->len) {
|
|
+ fprintf(stderr, "output file write failed\n");
|
|
+ goto out_close_fd;
|
|
+ }
|
|
+ }
|
|
+ free_extent_buffer(eb);
|
|
+ logical += root->sectorsize;
|
|
+ bytes -= root->sectorsize;
|
|
+ }
|
|
+
|
|
+out_close_fd:
|
|
+ if (output_file && out_fd != 1)
|
|
+ close(out_fd);
|
|
+close:
|
|
+ close_ctree(root);
|
|
+ return ret;
|
|
+}
|
|
--
|
|
1.6.6.1
|
|
|