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Commit d51033d0 authored by David Sterba's avatar David Sterba
Browse files

btrfs: introduce pending action: commit 



In some contexts, like in sysfs handlers, we don't want to trigger a
transaction commit. It's a heavy operation, we don't know what external
locks may be taken. Instead, make it possible to finish the operation
through sync syscall or SYNC_FS ioctl.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
parent 7e1876ac

fs/btrfs/ctree.h

+1 −0
Original line number Diff line number Diff line
@@ -2132,6 +2132,7 @@ struct btrfs_ioctl_defrag_range_args { 


#define BTRFS_PENDING_SET_INODE_MAP_CACHE	(0)

#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE	(1)

#define BTRFS_PENDING_COMMIT			(2)



#define btrfs_test_pending(info, opt)	\

	test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)

fs/btrfs/transaction.c

+5 −0
Original line number Diff line number Diff line
@@ -2036,6 +2036,11 @@ void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info) 
		btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);

	prev &= ~bit;



	bit = 1 << BTRFS_PENDING_COMMIT;

	if (prev & bit)

		btrfs_debug(fs_info, "pending commit done");

	prev &= ~bit;



	if (prev)

		btrfs_warn(fs_info,

			"unknown pending changes left 0x%lx, ignoring", prev);