Commit b5e2c59a authored by Kozlowski Mateusz's avatar Kozlowski Mateusz Committed by Ben Walker
Browse files

FTL: Add fast shutdown path 



Adds the ability to persist only the most important metadata. The rest
is stored in shared memory.

Signed-off-by: default avatarKozlowski Mateusz <mateusz.kozlowski@intel.com>
Signed-off-by: default avatarArtur Paszkiewicz <artur.paszkiewicz@intel.com>
Change-Id: I4084c04ba09115a7a08ff66fd33552a2ec60d801
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13360


Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
parent ef93cc38

lib/ftl/mngt/ftl_mngt_md.c

+48 −0
Original line number Diff line number Diff line
@@ -138,6 +138,16 @@ ftl_mngt_persist_nv_cache_metadata(struct spdk_ftl_dev *dev, struct ftl_mngt_pro 
	persist(dev, mngt, FTL_LAYOUT_REGION_TYPE_NVC_MD);

}



static void

ftl_mngt_fast_persist_nv_cache_metadata(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt)

{

	if (ftl_nv_cache_save_state(&dev->nv_cache)) {

		ftl_mngt_fail_step(mngt);

		return;

	}

	ftl_mngt_next_step(mngt);

}



static void

ftl_mngt_persist_vld_map_metadata(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt)

{
@@ -223,6 +233,33 @@ ftl_mngt_persist_md(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt) 
	ftl_mngt_call_process(mngt, &desc_persist);

}



/*

 * Fast clean shutdown path - skips the persistance of most metadata regions and

 * relies on their shared memory state instead.

 */

static const struct ftl_mngt_process_desc desc_fast_persist = {

	.name = "Fast persist metadata",

	.steps = {

		{

			.name = "Fast persist NV cache metadata",

			.action = ftl_mngt_fast_persist_nv_cache_metadata,

		},

#ifdef SPDK_FTL_VSS_EMU

		{

			.name = "Persist VSS metadata",

			.action = ftl_mngt_persist_vss,

		},

#endif

		{}

	}

};



void

ftl_mngt_fast_persist_md(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt)

{

	ftl_mngt_call_process(mngt, &desc_fast_persist);

}



void

ftl_mngt_init_default_sb(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt)

{
@@ -274,6 +311,17 @@ ftl_mngt_set_clean(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt) 
	dev->sb_shm->shm_ready = false;

}



void

ftl_mngt_set_shm_clean(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt)

{

	struct ftl_superblock *sb = dev->sb;



	sb->clean = 1;

	dev->sb_shm->shm_clean = true;

	sb->header.crc = get_sb_crc(sb);

	ftl_mngt_next_step(mngt);

}



/*

 * Initializes the superblock fields during first startup of FTL

 */

lib/ftl/mngt/ftl_mngt_shutdown.c

+52 −1
Original line number Diff line number Diff line
@@ -55,8 +55,59 @@ static const struct ftl_mngt_process_desc desc_shutdown = { 
	}

};



/*

 * Steps executed during fast clean shutdown (shutting down to shared memory). Utilizes

 * minimum amount of metadata persistence and rolls back any setup steps executed during

 * startup (closing bdevs, io channels, etc)

 */

static const struct ftl_mngt_process_desc desc_fast_shutdown = {

	.name = "FTL fast shutdown",

	.steps = {

		{

			.name = "Deinit core IO channel",

			.action = ftl_mngt_deinit_io_channel

		},

		{

			.name = "Unregister IO device",

			.action = ftl_mngt_unregister_io_device

		},

		{

			.name = "Stop core poller",

			.action = ftl_mngt_stop_core_poller

		},

		{

			.name = "Fast persist metadata",

			.action = ftl_mngt_fast_persist_md

		},

		{

			.name = "Set FTL SHM clean state",

			.action = ftl_mngt_set_shm_clean

		},

		{

			.name = "Dump statistics",

			.action = ftl_mngt_dump_stats

		},

		{

			.name = "Deinitialize L2P",

			.action = ftl_mngt_deinit_l2p

		},

		{

			.name = "Rollback FTL device",

			.action = ftl_mngt_rollback_device

		},

		{}

	}

};



int

ftl_mngt_call_dev_shutdown(struct spdk_ftl_dev *dev, ftl_mngt_completion cb, void *cb_cntx)

{

	return ftl_mngt_process_execute(dev, &desc_shutdown, cb, cb_cntx);

	const struct ftl_mngt_process_desc *pdesc;



	if (dev->conf.fast_shutdown) {

		pdesc = &desc_fast_shutdown;

	} else {

		pdesc = &desc_shutdown;

	}

	return ftl_mngt_process_execute(dev, pdesc, cb, cb_cntx);

}

lib/ftl/mngt/ftl_mngt_steps.h

+4 −0
Original line number Diff line number Diff line
@@ -84,6 +84,8 @@ void ftl_mngt_deinit_md(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt) 


void ftl_mngt_persist_md(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_fast_persist_md(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_rollback_device(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_dump_stats(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);
@@ -94,6 +96,8 @@ void ftl_mngt_set_dirty(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt) 


void ftl_mngt_set_clean(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_set_shm_clean(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_init_vld_map(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);



void ftl_mngt_deinit_vld_map(struct spdk_ftl_dev *dev, struct ftl_mngt_process *mngt);