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Commit 8d2d83a8 authored by Boaz Harrosh's avatar Boaz Harrosh
Browse files

exofs: Remove unused data_map member from exofs_sb_info 



The struct pnfs_osd_data_map data_map member of exofs_sb_info was
never used after mount. In fact all it's members were duplicated
by the ore_layout structure. So just remove the duplicated information.

Also removed some stupid, but perfectly supported, restrictions on
layout parameters. The case where num_devices is not divisible by
mirror_count+1 is perfectly fine since the rotating device view
will eventually use all the devices it can get.

Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
parent 5bf696da

fs/exofs/exofs.h

+0 −3
Original line number Diff line number Diff line
@@ -66,9 +66,6 @@ struct exofs_sb_info { 
	u32		s_next_generation;	/* next gen # to use          */

	atomic_t	s_curr_pending;		/* number of pending commands */



	struct pnfs_osd_data_map data_map;	/* Default raid to use

						 * FIXME: Needed ?

						 */

	struct ore_layout	layout;		/* Default files layout       */

	struct ore_comp one_comp;		/* id & cred of partition id=0*/

	struct ore_components oc;		/* comps for the partition    */

fs/exofs/super.c

+22 −35
Original line number Diff line number Diff line
@@ -481,64 +481,51 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, 
{

	u64 stripe_length;



	sbi->data_map.odm_num_comps   =

				le32_to_cpu(dt->dt_data_map.cb_num_comps);

	sbi->data_map.odm_stripe_unit =

	sbi->layout.stripe_unit =

				le64_to_cpu(dt->dt_data_map.cb_stripe_unit);

	sbi->data_map.odm_group_width =

	sbi->layout.group_width =

				le32_to_cpu(dt->dt_data_map.cb_group_width);

	sbi->data_map.odm_group_depth =

	sbi->layout.group_depth =

				le32_to_cpu(dt->dt_data_map.cb_group_depth);

	sbi->data_map.odm_mirror_cnt  =

				le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);

	sbi->data_map.odm_raid_algorithm  =

	sbi->layout.mirrors_p1  =

				le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1;

	sbi->layout.raid_algorithm  =

				le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);



/* FIXME: Only raid0 for now. if not so, do not mount */

	if (sbi->data_map.odm_num_comps != numdevs) {

		EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",

			  sbi->data_map.odm_num_comps, numdevs);

		return -EINVAL;

	}

	if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {

	if (sbi->layout.raid_algorithm != PNFS_OSD_RAID_0) {

		EXOFS_ERR("Only RAID_0 for now\n");

		return -EINVAL;

	}

	if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {

		EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",

			  numdevs, sbi->data_map.odm_mirror_cnt);

	if (numdevs < (sbi->layout.group_width * sbi->layout.mirrors_p1)) {

		EXOFS_ERR("Data Map wrong, "

			  "numdevs=%d < group_width=%d * mirrors=%d\n",

			  numdevs, sbi->layout.group_width,

			  sbi->layout.mirrors_p1);

		return -EINVAL;

	}



	if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {

	if (0 != (sbi->layout.stripe_unit & ~PAGE_MASK)) {

		EXOFS_ERR("Stripe Unit(0x%llx)"

			  " must be Multples of PAGE_SIZE(0x%lx)\n",

			  _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);

			  _LLU(sbi->layout.stripe_unit), PAGE_SIZE);

		return -EINVAL;

	}



	sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;

	sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;



	if (sbi->data_map.odm_group_width) {

		sbi->layout.group_width = sbi->data_map.odm_group_width;

		sbi->layout.group_depth = sbi->data_map.odm_group_depth;

	if (sbi->layout.group_width) {

		if (!sbi->layout.group_depth) {

			EXOFS_ERR("group_depth == 0 && group_width != 0\n");

			return -EINVAL;

		}

		sbi->layout.group_count = sbi->data_map.odm_num_comps /

						sbi->layout.mirrors_p1 /

						sbi->data_map.odm_group_width;

		sbi->layout.group_count = numdevs / sbi->layout.mirrors_p1 /

						sbi->layout.group_width;

	} else {

		if (sbi->data_map.odm_group_depth) {

		if (sbi->layout.group_depth) {

			printk(KERN_NOTICE "Warning: group_depth ignored "

				"group_width == 0 && group_depth == %d\n",

				sbi->data_map.odm_group_depth);

			sbi->data_map.odm_group_depth = 0;

				"group_width == 0 && group_depth == %lld\n",

				_LLU(sbi->layout.group_depth));

		}

		sbi->layout.group_width = sbi->data_map.odm_num_comps /

							sbi->layout.mirrors_p1;

		sbi->layout.group_width = numdevs / sbi->layout.mirrors_p1;

		sbi->layout.group_depth = -1;

		sbi->layout.group_count = 1;

	}
@@ -558,7 +545,7 @@ static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, 
		sbi->layout.group_width,

		_LLU(sbi->layout.group_depth),

		sbi->layout.mirrors_p1,

		sbi->data_map.odm_raid_algorithm);

		sbi->layout.raid_algorithm);

	return 0;

}

include/scsi/osd_ore.h

+2 −0
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ struct ore_comp { 


struct ore_layout {

	/* Our way of looking at the data_map */

	enum pnfs_osd_raid_algorithm4

		 raid_algorithm;

	unsigned stripe_unit;

	unsigned mirrors_p1;