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btrfs-progs: check: repair inode nbytes in lowmem mode 

After checking one entire inode item, we should get the actual
nbytes of the inode item.

Like original mode, repair_inode_nbytes_lowmem() sets nbytes in
struct btrfs_inode_item to the actual nbytes.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Su Yue 2017-08-28 10:41:27 +08:00 committed by David Sterba
parent e33cad4e34
commit 281eec7a9d
1 changed files with 75 additions and 3 deletions
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78
cmds-check.c
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@ -2017,6 +2017,9 @@ static int process_one_leaf_v2(struct btrfs_root *root, struct btrfs_path *path,
again:
err |= check_inode_item(root, path, ext_ref);
/* modify cur since check_inode_item may change path */
cur = path->nodes[0];
if (err & LAST_ITEM)
goto out;
@ -2364,6 +2367,7 @@ static int walk_down_tree_v2(struct btrfs_root *root, struct btrfs_path *path,
}
ret = process_one_leaf_v2(root, path, nrefs,
level, ext_ref);
cur = path->nodes[*level];
break;
} else {
ret = btrfs_check_node(root, NULL, cur);
@ -4952,6 +4956,67 @@ static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey,
return err;
}
/*
* Set inode item nbytes to @nbytes
*
* Returns 0 on success
* Returns != 0 on error
*/
static int repair_inode_nbytes_lowmem(struct btrfs_root *root,
struct btrfs_path *path,
u64 ino, u64 nbytes)
{
struct btrfs_trans_handle *trans;
struct btrfs_inode_item *ii;
struct btrfs_key key;
struct btrfs_key research_key;
int err = 0;
int ret;
btrfs_item_key_to_cpu(path->nodes[0], &research_key, path->slots[0]);
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
err |= ret;
goto out;
}
btrfs_release_path(path);
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret > 0)
ret = -ENOENT;
if (ret) {
err |= ret;
goto fail;
}
ii = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
btrfs_set_inode_nbytes(path->nodes[0], ii, nbytes);
btrfs_mark_buffer_dirty(path->nodes[0]);
fail:
btrfs_commit_transaction(trans, root);
out:
if (ret)
error("failed to set nbytes in inode %llu root %llu",
ino, root->root_key.objectid);
else
printf("Set nbytes in inode item %llu root %llu\n to %llu", ino,
root->root_key.objectid, nbytes);
/* research path */
btrfs_release_path(path);
ret = btrfs_search_slot(NULL, root, &research_key, path, 0, 0);
err |= ret;
return err;
}
/*
* Check INODE_ITEM and related ITEMs (the same inode number)
* 1. check link count
@ -5107,9 +5172,16 @@ out:
}
if (nbytes != extent_size) {
err |= NBYTES_ERROR;
error("root %llu INODE[%llu] nbytes(%llu) not equal to extent_size(%llu)",
root->objectid, inode_id, nbytes, extent_size);
if (repair)
ret = repair_inode_nbytes_lowmem(root, path,
inode_id, extent_size);
if (!repair || ret) {
err |= NBYTES_ERROR;
error(
"root %llu INODE[%llu] nbytes %llu not equal to extent_size %llu",
root->objectid, inode_id, nbytes,
extent_size);
}
}
}