Commit 0f85e244 authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: add fs context handling functions 



We are going to use the fs context to hold the mount options, so
allocate the btrfs_fs_context when we're asked to init the fs context,
and free it in the free callback.

Reviewed-by: default avatarChristian Brauner <brauner@kernel.org>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 17b36120

fs/btrfs/super.c

+35 −1
Original line number Diff line number Diff line
@@ -2642,10 +2642,44 @@ static void btrfs_kill_super(struct super_block *sb) 
	btrfs_free_fs_info(fs_info);

}



static const struct fs_context_operations btrfs_fs_context_ops __maybe_unused = {

static void btrfs_free_fs_context(struct fs_context *fc)

{

	struct btrfs_fs_context *ctx = fc->fs_private;



	if (!ctx)

		return;



	kfree(ctx->subvol_name);

	kfree(ctx);

}



static const struct fs_context_operations btrfs_fs_context_ops = {

	.parse_param	= btrfs_parse_param,

	.free		= btrfs_free_fs_context,

};



static int __maybe_unused btrfs_init_fs_context(struct fs_context *fc)

{

	struct btrfs_fs_context *ctx;



	ctx = kzalloc(sizeof(struct btrfs_fs_context), GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;



	ctx->thread_pool_size = min_t(unsigned long, num_online_cpus() + 2, 8);

	ctx->max_inline = BTRFS_DEFAULT_MAX_INLINE;

	ctx->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;

	ctx->subvol_objectid = BTRFS_FS_TREE_OBJECTID;

#ifndef CONFIG_BTRFS_FS_POSIX_ACL

	ctx->noacl = true;

#endif



	fc->fs_private = ctx;

	fc->ops = &btrfs_fs_context_ops;



	return 0;

}



static struct file_system_type btrfs_fs_type = {

	.owner		= THIS_MODULE,

	.name		= "btrfs",