A user reported a problem with his fs where he had a bogus isize on his
directory. In order to make sure my patch for fsck fixes this properly I needed
to be able to corrupt an inode like this, which is what this patch is for.
Eventually I want to extend this to corrupt everything so we can integrate tests
into btrfs-progs to run btrfsck against to make sure we don't regress on fixing
things with btrfsck. Thanks,
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
---
btrfs-corrupt-block.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 118 insertions(+), 7 deletions(-)
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c
index 9b72ad9..1a7b6ca 100644
--- a/btrfs-corrupt-block.c
+++ b/btrfs-corrupt-block.c
@@ -32,6 +32,8 @@
#include "list.h"
#include "version.h"
+#define FIELD_BUF_LEN 80
+
struct extent_buffer *debug_corrupt_block(struct btrfs_root *root, u64 bytenr,
u32 blocksize, int copy)
{
@@ -96,6 +98,9 @@ static void print_usage(void)
fprintf(stderr, "\t-E The whole extent tree to be corrupted\n");
fprintf(stderr, "\t-u Given chunk item to be corrupted\n");
fprintf(stderr, "\t-U The whole chunk tree to be corrupted\n");
+ fprintf(stderr, "\t-i The inode item to corrupt (must also specify "
+ "the field to corrupt)\n");
+ fprintf(stderr, "\t-f The field in the item to corrupt\n");
exit(1);
}
@@ -279,6 +284,83 @@ static void btrfs_corrupt_extent_tree(struct btrfs_trans_handle *trans,
}
}
+enum btrfs_inode_field {
+ BTRFS_INODE_FIELD_ISIZE,
+ BTRFS_INODE_FIELD_BAD,
+};
+
+static enum btrfs_inode_field convert_field(char *field)
+{
+ if (!strncmp(field, "isize", FIELD_BUF_LEN))
+ return BTRFS_INODE_FIELD_ISIZE;
+ return BTRFS_INODE_FIELD_BAD;
+}
+
+static int corrupt_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 inode, char *field)
+{
+ struct btrfs_inode_item *ei;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ enum btrfs_inode_field corrupt_field = convert_field(field);
+ u64 bogus;
+ u64 orig;
+ int ret;
+
+ if (corrupt_field == BTRFS_INODE_FIELD_BAD) {
+ fprintf(stderr, "Invalid field %s\n", field);
+ return -EINVAL;
+ }
+
+ key.objectid = inode;
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.offset = (u64)-1;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret < 0)
+ goto out;
+ if (ret) {
+ if (!path->slots[0]) {
+ fprintf(stderr, "Couldn't find inode %Lu\n", inode);
+ ret = -ENOENT;
+ goto out;
+ }
+ path->slots[0]--;
+ ret = 0;
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.objectid != inode) {
+ fprintf(stderr, "Couldn't find inode %Lu\n", inode);
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_inode_item);
+ switch (corrupt_field) {
+ case BTRFS_INODE_FIELD_ISIZE:
+ orig = btrfs_inode_size(path->nodes[0], ei);
+ do {
+ bogus = rand();
+ } while (bogus == orig);
+
+ btrfs_set_inode_size(path->nodes[0], ei, bogus);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
static struct option long_options[] = {
/* { "byte-count", 1, NULL, 'b' }, */
{ "logical", 1, NULL, 'l' },
@@ -289,6 +371,8 @@ static struct option long_options[] = {
{ "keys", 0, NULL, 'k' },
{ "chunk-record", 0, NULL, 'u' },
{ "chunk-tree", 0, NULL, 'U' },
+ { "inode", 1, NULL, 'i'},
+ { "field", 1, NULL, 'f'},
{ 0, 0, 0, 0}
};
@@ -449,12 +533,15 @@ int main(int ac, char **av)
int corrupt_block_keys = 0;
int chunk_rec = 0;
int chunk_tree = 0;
+ u64 inode = 0;
+ char field[FIELD_BUF_LEN];
+ field[0] = '\0';
srand(128);
while(1) {
int c;
- c = getopt_long(ac, av, "l:c:b:eEkuU", long_options,
+ c = getopt_long(ac, av, "l:c:b:eEkuUi:f:", long_options,
&option_index);
if (c < 0)
break;
@@ -464,7 +551,7 @@ int main(int ac, char **av)
break;
case 'c':
copy = atoi(optarg);
- if (copy == 0) {
+ if (copy <= 0) {
fprintf(stderr,
"invalid copy number\n");
print_usage();
@@ -492,6 +579,16 @@ int main(int ac, char **av)
break;
case 'U':
chunk_tree = 1;
+ case 'i':
+ inode = atoll(optarg);
+ if (inode == 0) {
+ fprintf(stderr,
+ "invalid inode number\n");
+ print_usage();
+ }
+ break;
+ case 'f':
+ strncpy(field, optarg, FIELD_BUF_LEN);
break;
default:
print_usage();
@@ -500,11 +597,6 @@ int main(int ac, char **av)
ac = ac - optind;
if (ac == 0)
print_usage();
- if (logical == (u64)-1 && !(extent_tree || chunk_tree))
- print_usage();
- if (copy < 0)
- print_usage();
-
dev = av[optind];
radix_tree_init();
@@ -517,6 +609,9 @@ int main(int ac, char **av)
}
if (extent_rec) {
struct btrfs_trans_handle *trans;
+
+ if (logical == (u64)-1)
+ print_usage();
trans = btrfs_start_transaction(root, 1);
ret = corrupt_extent (trans, root, logical, 0);
btrfs_commit_transaction(trans, root);
@@ -535,6 +630,8 @@ int main(int ac, char **av)
struct btrfs_path *path;
int del;
+ if (logical == (u64)-1)
+ print_usage();
del = rand() % 3;
path = btrfs_alloc_path();
@@ -560,6 +657,20 @@ int main(int ac, char **av)
btrfs_commit_transaction(trans, root);
goto out_close;
}
+ if (inode) {
+ struct btrfs_trans_handle *trans;
+
+ if (!strlen(field))
+ print_usage();
+ printf("corrupting inode\n");
+ trans = btrfs_start_transaction(root, 1);
+ ret = corrupt_inode(trans, root, inode, field);
+ btrfs_commit_transaction(trans, root);
+ goto out_close;
+ }
+
+ if (logical == (u64)-1)
+ print_usage();
if (bytes == 0)
bytes = root->sectorsize;
--
1.7.7.6
--
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