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btrfs: hold a ref on the root in open_ctree

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We lookup the fs_root and put it in our fs_info directly, we should hold
a ref on this root for the lifetime of the fs_info.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:54 -05:00 • committed by David Sterba
parent 0d4b046301
commit 4c78e9f596
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/disk-io.c
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@ -1537,6 +1537,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info->free_space_root);
kfree(fs_info->super_copy);
kfree(fs_info->super_for_commit);
btrfs_put_fs_root(fs_info->fs_root);
kvfree(fs_info);
}
@ -3206,6 +3207,13 @@ int __cold open_ctree(struct super_block *sb,
goto fail_qgroup;
}
if (!btrfs_grab_fs_root(fs_info->fs_root)) {
fs_info->fs_root = NULL;
err = -ENOENT;
btrfs_warn(fs_info, "failed to grab a ref on the fs tree");
goto fail_qgroup;
}
if (sb_rdonly(sb))
return 0;