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Btrfs: deal with free space cache errors while replaying log

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So everybody who got hit by my fsync bug will still continue to hit this
BUG_ON() in the free space cache, which is pretty heavy handed.  So I took a
file system that had this bug and fixed up all the BUG_ON()'s and leaks that
popped up when I tried to mount a broken file system like this.  With this patch
we just fail to mount instead of panicing.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik
2013-04-25 15:55:30 -04:00
parent 3d7b5a2882
commit b50c6e250e
3 changed files with 60 additions and 33 deletions
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65
fs/btrfs/tree-log.c
View File

@@ -277,17 +277,19 @@ static int process_one_buffer(struct btrfs_root *log,
struct extent_buffer *eb,
struct walk_control *wc, u64 gen)
{
if (wc->pin)
btrfs_pin_extent_for_log_replay(log->fs_info->extent_root,
eb->start, eb->len);
int ret = 0;
if (btrfs_buffer_uptodate(eb, gen, 0)) {
if (wc->pin)
ret = btrfs_pin_extent_for_log_replay(log->fs_info->extent_root,
eb->start, eb->len);
if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) {
if (wc->write)
btrfs_write_tree_block(eb);
if (wc->wait)
btrfs_wait_tree_block_writeback(eb);
}
return 0;
return ret;
}
/*
@@ -623,7 +625,8 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
ins.objectid, ins.offset,
0, root->root_key.objectid,
key->objectid, offset, 0);
BUG_ON(ret);
if (ret)
goto out;
} else {
/*
* insert the extent pointer in the extent
@@ -632,7 +635,8 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
ret = btrfs_alloc_logged_file_extent(trans,
root, root->root_key.objectid,
key->objectid, offset, &ins);
BUG_ON(ret);
if (ret)
goto out;
}
btrfs_release_path(path);
@@ -1952,11 +1956,13 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
if (S_ISDIR(mode)) {
ret = replay_dir_deletes(wc->trans,
root, log, path, key.objectid, 0);
BUG_ON(ret);
if (ret)
break;
}
ret = overwrite_item(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
if (ret)
break;
/* for regular files, make sure corresponding
* orhpan item exist. extents past the new EOF
@@ -1965,12 +1971,14 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
if (S_ISREG(mode)) {
ret = insert_orphan_item(wc->trans, root,
key.objectid);
BUG_ON(ret);
if (ret)
break;
}
ret = link_to_fixup_dir(wc->trans, root,
path, key.objectid);
BUG_ON(ret);
if (ret)
break;
}
if (wc->stage < LOG_WALK_REPLAY_ALL)
continue;
@@ -1979,28 +1987,35 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
if (key.type == BTRFS_XATTR_ITEM_KEY) {
ret = overwrite_item(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
if (ret)
break;
} else if (key.type == BTRFS_INODE_REF_KEY) {
ret = add_inode_ref(wc->trans, root, log, path,
eb, i, &key);
BUG_ON(ret && ret != -ENOENT);
if (ret && ret != -ENOENT)
break;
ret = 0;
} else if (key.type == BTRFS_INODE_EXTREF_KEY) {
ret = add_inode_ref(wc->trans, root, log, path,
eb, i, &key);
BUG_ON(ret && ret != -ENOENT);
if (ret && ret != -ENOENT)
break;
ret = 0;
} else if (key.type == BTRFS_EXTENT_DATA_KEY) {
ret = replay_one_extent(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
if (ret)
break;
} else if (key.type == BTRFS_DIR_ITEM_KEY ||
key.type == BTRFS_DIR_INDEX_KEY) {
ret = replay_one_dir_item(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
if (ret)
break;
}
}
btrfs_free_path(path);
return 0;
return ret;
}
static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
@@ -2045,8 +2060,10 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
if (*level == 1) {
ret = wc->process_func(root, next, wc, ptr_gen);
if (ret)
if (ret) {
free_extent_buffer(next);
return ret;
}
path->slots[*level]++;
if (wc->free) {
@@ -3970,6 +3987,9 @@ again:
wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key);
if (IS_ERR(wc.replay_dest)) {
ret = PTR_ERR(wc.replay_dest);
free_extent_buffer(log->node);
free_extent_buffer(log->commit_root);
kfree(log);
btrfs_error(fs_info, ret, "Couldn't read target root "
"for tree log recovery.");
goto error;
@@ -3978,12 +3998,10 @@ again:
wc.replay_dest->log_root = log;
btrfs_record_root_in_trans(trans, wc.replay_dest);
ret = walk_log_tree(trans, log, &wc);
BUG_ON(ret);
if (wc.stage == LOG_WALK_REPLAY_ALL) {
if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) {
ret = fixup_inode_link_counts(trans, wc.replay_dest,
path);
BUG_ON(ret);
}
key.offset = found_key.offset - 1;
@@ -3992,6 +4010,9 @@ again:
free_extent_buffer(log->commit_root);
kfree(log);
if (ret)
goto error;
if (found_key.offset == 0)
break;
}
@@ -4024,6 +4045,8 @@ again:
return 0;
error:
if (wc.trans)
btrfs_end_transaction(wc.trans, fs_info->tree_root);
btrfs_free_path(path);
return ret;
}