File 0156-btrfs-corrupt-block-add-e-option-to-corrupt-the-exte.patch of Package btrfsprogs
From a0e60b027576e8e3e3d77b77eaff1360a374af60 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Mon, 6 Feb 2012 08:54:05 -0500
Subject: [PATCH 05/18] btrfs-corrupt-block: add -e option to corrupt the
extent record
This will zero out the extent allocation tree records for the extent.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
btrfs-corrupt-block.c | 115 ++++++++++++++++++++++++++++++++-----------------
1 files changed, 76 insertions(+), 39 deletions(-)
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c
index ace61c1..59e7cb4 100644
--- a/btrfs-corrupt-block.c
+++ b/btrfs-corrupt-block.c
@@ -32,11 +32,6 @@
#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_corrupt_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize, int copy)
{
@@ -62,7 +57,7 @@ struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
device->total_ios++;
eb->dev_bytenr = multi->stripes[0].physical;
- fprintf(info_file, "mirror %d logical %Lu physical %Lu "
+ fprintf(stdout, "mirror %d logical %Lu physical %Lu "
"device %s\n", mirror_num, (unsigned long long)bytenr,
(unsigned long long)eb->dev_bytenr, device->name);
kfree(multi);
@@ -106,24 +101,88 @@ static struct option long_options[] = {
{ 0, 0, 0, 0}
};
+static int corrupt_extent(struct btrfs_root *root, u64 bytenr, int copy)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct extent_buffer *leaf;
+ u32 item_size;
+ unsigned long ptr;
+ struct btrfs_path *path;
+ int ret;
+ int slot;
+
+ trans = btrfs_start_transaction(root, 1);
+ path = btrfs_alloc_path();
+
+ key.objectid = bytenr;
+ key.type = (u8)-1;
+ key.offset = (u64)-1;
+
+ while(1) {
+ ret = btrfs_search_slot(trans, root->fs_info->extent_root,
+ &key, path, 0, 1);
+ if (ret < 0)
+ break;
+
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ break;
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid != bytenr)
+ break;
+
+ if (key.type != BTRFS_EXTENT_ITEM_KEY &&
+ key.type != BTRFS_TREE_BLOCK_REF_KEY &&
+ key.type != BTRFS_EXTENT_DATA_REF_KEY &&
+ key.type != BTRFS_EXTENT_REF_V0_KEY &&
+ key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
+ key.type != BTRFS_SHARED_DATA_REF_KEY)
+ goto next;
+
+ fprintf(stderr, "corrupting extent record: key %Lu %u %Lu\n",
+ key.objectid, key.type, key.offset);
+
+ ptr = btrfs_item_ptr_offset(leaf, slot);
+ item_size = btrfs_item_size_nr(leaf, slot);
+ memset_extent_buffer(leaf, 0, ptr, item_size);
+ btrfs_mark_buffer_dirty(leaf);
+next:
+ btrfs_release_path(NULL, path);
+
+ if (key.offset > 0)
+ key.offset--;
+ if (key.offset == 0)
+ break;
+ }
+
+ btrfs_free_path(path);
+ btrfs_commit_transaction(trans, root);
+ ret = close_ctree(root);
+ BUG_ON(ret);
+ return 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 = 4096;
- int out_fd = 0;
- int err;
+ int extent_rec;
while(1) {
int c;
- c = getopt_long(ac, av, "l:c:", long_options,
+ c = getopt_long(ac, av, "l:c:e", long_options,
&option_index);
if (c < 0)
break;
@@ -152,6 +211,9 @@ int main(int ac, char **av)
print_usage();
}
break;
+ case 'e':
+ extent_rec = 1;
+ break;
default:
print_usage();
}
@@ -174,23 +236,9 @@ int main(int ac, char **av)
fprintf(stderr, "Open ctree failed\n");
exit(1);
}
-
- info_file = stdout;
- 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 (extent_rec) {
+ ret = corrupt_extent (root, logical, 0);
+ goto out;
}
if (bytes == 0)
@@ -201,21 +249,10 @@ int main(int ac, char **av)
while (bytes > 0) {
eb = debug_corrupt_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:
+out:
return ret;
}
--
1.7.6.233.gd79bc
