Commit 3818aea2 authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: Add noinode_cache mount option 



Add noinode_cache mount option for btrfs.

Since inode map cache involves all the btrfs_find_free_ino/return_ino
things and if just trigger the mount_opt,
an inode number get from inode map cache will not returned to inode map
cache.

To keep the find and return inode both in the same behavior,
a new bit in mount_opt, CHANGE_INODE_CACHE, is introduced for this idea.
CHANGE_INODE_CACHE is set/cleared in remounting, and the original
INODE_MAP_CACHE is set/cleared according to CHANGE_INODE_CACHE after a
success transaction.
Since find/return inode is all done between btrfs_start_transaction and
btrfs_commit_transaction, this will keep consistent behavior.

Also noinode_cache mount option will not stop the caching_kthread.

Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
Signed-off-by: default avatarQu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent ade2e0b3

fs/btrfs/ctree.h

+1 −0
Original line number Diff line number Diff line
@@ -2023,6 +2023,7 @@ struct btrfs_ioctl_defrag_range_args { 
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)

#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR	(1 << 22)

#define BTRFS_MOUNT_RESCAN_UUID_TREE	(1 << 23)

#define	BTRFS_MOUNT_CHANGE_INODE_CACHE	(1 << 24)



#define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)

fs/btrfs/disk-io.c

+4 −0
Original line number Diff line number Diff line
@@ -2776,6 +2776,10 @@ retry_root_backup: 
		btrfs_set_opt(fs_info->mount_opt, SSD);

	}



	/* Set the real inode map cache flag */

	if (btrfs_test_opt(tree_root, CHANGE_INODE_CACHE))

		btrfs_set_opt(tree_root->fs_info->mount_opt, INODE_MAP_CACHE);



#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY

	if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) {

		ret = btrfsic_mount(tree_root, fs_devices,

fs/btrfs/super.c

+8 −2
Original line number Diff line number Diff line
@@ -327,7 +327,7 @@ enum { 
	Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,

	Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,

	Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,

	Opt_datasum, Opt_treelog,

	Opt_datasum, Opt_treelog, Opt_noinode_cache,

	Opt_err,

};
@@ -370,6 +370,7 @@ static match_table_t tokens = { 
	{Opt_defrag, "autodefrag"},

	{Opt_nodefrag, "noautodefrag"},

	{Opt_inode_cache, "inode_cache"},

	{Opt_noinode_cache, "noinode_cache"},

	{Opt_no_space_cache, "nospace_cache"},

	{Opt_recovery, "recovery"},

	{Opt_skip_balance, "skip_balance"},
@@ -627,7 +628,12 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) 
			break;

		case Opt_inode_cache:

			btrfs_info(root->fs_info, "enabling inode map caching");

			btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE);

			btrfs_set_opt(info->mount_opt, CHANGE_INODE_CACHE);

			break;

		case Opt_noinode_cache:

			if (btrfs_test_opt(root, CHANGE_INODE_CACHE))

				btrfs_info(root->fs_info, "disabling inode map caching");

			btrfs_clear_opt(info->mount_opt, CHANGE_INODE_CACHE);

			break;

		case Opt_clear_cache:

			btrfs_info(root->fs_info, "force clearing of disk cache");

fs/btrfs/transaction.c

+9 −0
Original line number Diff line number Diff line
@@ -1826,6 +1826,15 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 
		goto cleanup_transaction;

	}



	/*

	 * Since the transaction is done, we should set the inode map cache flag

	 * before any other comming transaction.

	 */

	if (btrfs_test_opt(root, CHANGE_INODE_CACHE))

		btrfs_set_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);

	else

		btrfs_clear_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);



	/* commit_fs_roots gets rid of all the tree log roots, it is now

	 * safe to free the root of tree log roots

	 */

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