Revert "btrfs: synchronize incompat feature bits with sysfs files"

This reverts commit 14e46e04.

This ends up doing sysfs operations from deep in balance (where we
should be GFP_NOFS) and under heavy balance load, we're making races
against sysfs internals.

Revert it for now while we figure things out.
Signed-off-by: NChris Mason <clm@fb.com>

fs/btrfs/free-space-tree.c

@@ -23,7 +23,6 @@
 #include "locking.h"
 #include "free-space-tree.h"
 #include "transaction.h"
-#include "sysfs.h"
 
 static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
 					struct btrfs_fs_info *fs_info,
@@ -1184,9 +1183,6 @@ int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info)
 	}
 
 	btrfs_set_fs_compat_ro(fs_info, FREE_SPACE_TREE);
-	btrfs_sysfs_feature_update(fs_info,
-		BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE, FEAT_COMPAT_RO);
-
 	fs_info->creating_free_space_tree = 0;
 
 	ret = btrfs_commit_transaction(trans, tree_root);
@@ -1255,9 +1251,6 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
 		return PTR_ERR(trans);
 
 	btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE);
-	btrfs_sysfs_feature_update(fs_info,
-		BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE, FEAT_COMPAT_RO);
-
 	fs_info->free_space_root = NULL;
 
 	ret = clear_free_space_tree(trans, free_space_root);

fs/btrfs/ioctl.c

@@ -1459,8 +1459,6 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 
 	if (range->compress_type == BTRFS_COMPRESS_LZO) {
 		btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
-		btrfs_sysfs_feature_update(root->fs_info,
-			BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO, FEAT_INCOMPAT);
 	}
 
 	ret = defrag_count;
@@ -4069,8 +4067,6 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
 	btrfs_free_path(path);
 
 	btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
-	btrfs_sysfs_feature_update(root->fs_info,
-		BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL, FEAT_INCOMPAT);
 	btrfs_end_transaction(trans, root);
 out:
 	mnt_drop_write_file(file);

fs/btrfs/super.c

@@ -58,7 +58,6 @@
 #include "dev-replace.h"
 #include "free-space-cache.h"
 #include "backref.h"
-#include "sysfs.h"
 #include "tests/btrfs-tests.h"
 
 #include "qgroup.h"
@@ -486,9 +485,6 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
 				btrfs_clear_opt(info->mount_opt, NODATACOW);
 				btrfs_clear_opt(info->mount_opt, NODATASUM);
 				btrfs_set_fs_incompat(info, COMPRESS_LZO);
-				btrfs_sysfs_feature_update(root->fs_info,
-					BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO,
-					FEAT_INCOMPAT);
 				no_compress = 0;
 			} else if (strncmp(args[0].from, "no", 2) == 0) {
 				compress_type = "no";

fs/btrfs/volumes.c

@@ -4469,8 +4469,6 @@ static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type)
 		return;
 
 	btrfs_set_fs_incompat(info, RAID56);
-	btrfs_sysfs_feature_update(info, BTRFS_FEATURE_INCOMPAT_RAID56,
-		FEAT_INCOMPAT);
 }
 
 #define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r)		\