Re: [PATCH v2 08/18] btrfs: add fs_parameter definitions

[David Sterba <dsterba@suse.cz>]

On Wed, Nov 08, 2023 at 02:08:43PM -0500, Josef Bacik wrote:
> In order to convert to the new mount api we have to change how we do the
> mount option parsing.  For now we're going to duplicate these helpers to
> make it easier to follow, and then remove the old code once everything
> is in place.  This patch contains the re-definiton of all of our mount
> options into the new fs_parameter_spec format.
> 
> Signed-off-by: Josef Bacik <josef@toxicpanda.com>
> ---
>  fs/btrfs/super.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 127 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index d7070269e3ea..0e9cb9ed6508 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -27,6 +27,7 @@
>  #include <linux/crc32c.h>
>  #include <linux/btrfs.h>
>  #include <linux/security.h>
> +#include <linux/fs_parser.h>
>  #include "messages.h"
>  #include "delayed-inode.h"
>  #include "ctree.h"
> @@ -132,7 +133,7 @@ enum {
>  	/* Debugging options */
>  	Opt_enospc_debug, Opt_noenospc_debug,
>  #ifdef CONFIG_BTRFS_DEBUG
> -	Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
> +	Opt_fragment, Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
>  #endif
>  #ifdef CONFIG_BTRFS_FS_REF_VERIFY
>  	Opt_ref_verify,
> @@ -222,6 +223,131 @@ static const match_table_t rescue_tokens = {
>  	{Opt_err, NULL},
>  };
>  
> +enum {
> +	Opt_fatal_errors_panic,
> +	Opt_fatal_errors_bug,
> +};
> +
> +static const struct constant_table btrfs_parameter_fatal_errors[] = {
> +	{ "panic", Opt_fatal_errors_panic },
> +	{ "bug", Opt_fatal_errors_bug },
> +	{}
> +};
> +
> +enum {
> +	Opt_discard_sync,
> +	Opt_discard_async,
> +};
> +
> +static const struct constant_table btrfs_parameter_discard[] = {
> +	{ "sync", Opt_discard_sync },
> +	{ "async", Opt_discard_async },
> +	{}
> +};
> +
> +enum {
> +	Opt_space_cache_v1,
> +	Opt_space_cache_v2,
> +};
> +
> +static const struct constant_table btrfs_parameter_space_cache[] = {
> +	{ "v1", Opt_space_cache_v1 },
> +	{ "v2", Opt_space_cache_v2 },
> +	{}
> +};
> +
> +enum {
> +	Opt_rescue_usebackuproot,
> +	Opt_rescue_nologreplay,
> +	Opt_rescue_ignorebadroots,
> +	Opt_rescue_ignoredatacsums,
> +	Opt_rescue_parameter_all,
> +};
> +
> +static const struct constant_table btrfs_parameter_rescue[] = {
> +	{ "usebackuproot", Opt_rescue_usebackuproot },
> +	{ "nologreplay", Opt_rescue_nologreplay },
> +	{ "ignorebadroots", Opt_rescue_ignorebadroots },
> +	{ "ibadroots", Opt_rescue_ignorebadroots },
> +	{ "ignoredatacsums", Opt_rescue_ignoredatacsums },
> +	{ "idatacsums", Opt_rescue_ignoredatacsums },
> +	{ "all", Opt_rescue_parameter_all },
> +	{}
> +};
> +
> +#ifdef CONFIG_BTRFS_DEBUG
> +enum {
> +	Opt_fragment_parameter_data,
> +	Opt_fragment_parameter_metadata,
> +	Opt_fragment_parameter_all,
> +};
> +
> +static const struct constant_table btrfs_parameter_fragment[] = {
> +	{ "data", Opt_fragment_parameter_data },
> +	{ "metadata", Opt_fragment_parameter_metadata },
> +	{ "all", Opt_fragment_parameter_all },
> +	{}
> +};
> +#endif
> +
> +static const struct fs_parameter_spec btrfs_fs_parameters[] __maybe_unused = {
> +	fsparam_flag_no("acl", Opt_acl),
> +	fsparam_flag("clear_cache", Opt_clear_cache),
> +	fsparam_u32("commit", Opt_commit_interval),
> +	fsparam_flag("compress", Opt_compress),
> +	fsparam_string("compress", Opt_compress_type),
> +	fsparam_flag("compress-force", Opt_compress_force),
> +	fsparam_string("compress-force", Opt_compress_force_type),
> +	fsparam_flag("degraded", Opt_degraded),
> +	fsparam_string("device", Opt_device),
> +	fsparam_enum("fatal_errors", Opt_fatal_errors, btrfs_parameter_fatal_errors),
> +	fsparam_flag_no("flushoncommit", Opt_flushoncommit),
> +	fsparam_flag_no("inode_cache", Opt_inode_cache),

I think it's a good opportunity to remove this option completely, its
functionality is gone since 5.11, that's eough time. I'm fine with
removing it both before or after the API switch.

> +	fsparam_string("max_inline", Opt_max_inline),
> +	fsparam_flag_no("barrier", Opt_barrier),
> +	fsparam_flag_no("datacow", Opt_datacow),
> +	fsparam_flag_no("datasum", Opt_datasum),
> +	fsparam_flag_no("autodefrag", Opt_defrag),
> +	fsparam_flag_no("discard", Opt_discard),
> +	fsparam_enum("discard", Opt_discard_mode, btrfs_parameter_discard),
> +	fsparam_u32("metadata_ratio", Opt_ratio),
> +	fsparam_flag("rescan_uuid_tree", Opt_rescan_uuid_tree),
> +	fsparam_flag("skip_balance", Opt_skip_balance),
> +	fsparam_flag_no("space_cache", Opt_space_cache),
> +	fsparam_enum("space_cache", Opt_space_cache_version, btrfs_parameter_space_cache),
> +	fsparam_flag_no("ssd", Opt_ssd),
> +	fsparam_flag_no("ssd_spread", Opt_ssd_spread),
> +	fsparam_string("subvol", Opt_subvol),
> +	fsparam_flag("subvol=", Opt_subvol_empty),
> +	fsparam_u64("subvolid", Opt_subvolid),
> +	fsparam_u32("thread_pool", Opt_thread_pool),
> +	fsparam_flag_no("treelog", Opt_treelog),
> +	fsparam_flag("user_subvol_rm_allowed", Opt_user_subvol_rm_allowed),
> +
> +	/* Rescue options */
> +	fsparam_enum("rescue", Opt_rescue, btrfs_parameter_rescue),
> +	/* Deprecated, with alias rescue=nologreplay */
> +	__fsparam(NULL, "nologreplay", Opt_nologreplay, fs_param_deprecated,
> +		  NULL),
> +	/* Deprecated, with alias rescue=usebackuproot */
> +	__fsparam(NULL, "usebackuproot", Opt_usebackuproot, fs_param_deprecated,
> +		  NULL),
> +
> +	/* Deprecated options */
> +	__fsparam(NULL, "recovery", Opt_recovery,
> +		  fs_param_neg_with_no|fs_param_deprecated, NULL),

Same here, 'recovery' obsoleted by the rescue options in 4.5.

> +
> +	/* Debugging options */
> +	fsparam_flag_no("enospc_debug", Opt_enospc_debug),
> +#ifdef CONFIG_BTRFS_DEBUG
> +	fsparam_enum("fragment", Opt_fragment, btrfs_parameter_fragment),
> +#endif
> +#ifdef CONFIG_BTRFS_FS_REF_VERIFY
> +	fsparam_flag("ref_verify", Opt_ref_verify),
> +#endif
> +	{}
> +};
> +
>  static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt,
>  			    const char *opt_name)
>  {
> -- 
> 2.41.0
>