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Commit fb86b1f0 authored by Joel Becker's avatar Joel Becker Committed by Mark Fasheh
Browse files

ocfs2: Define the contents of the slot_map file. 



The slot map file is merely an array of __le16.  Wrap it in a structure for
cleaner reference.

Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent fc881fa0

fs/ocfs2/ocfs2_fs.h

+12 −0
Original line number Diff line number Diff line
@@ -474,6 +474,18 @@ struct ocfs2_extent_block 
/* Actual on-disk size is one block */

};



/*

 * On disk slot map for OCFS2.  This defines the contents of the "slot_map"

 * system file.

 */

struct ocfs2_slot_map {

/*00*/	__le16 sm_slots[0];

/*

 * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,

 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.

 */

};



/*

 * On disk superblock for OCFS2

 * Note that it is contained inside an ocfs2_dinode, so all offsets

fs/ocfs2/slot_map.c

+8 −7
Original line number Diff line number Diff line
@@ -85,17 +85,17 @@ static void ocfs2_set_slot(struct ocfs2_slot_info *si, 
static void ocfs2_update_slot_info(struct ocfs2_slot_info *si)

{

	int i;

	__le16 *disk_info;

	struct ocfs2_slot_map *sm;



	/* we don't read the slot block here as ocfs2_super_lock

	 * should've made sure we have the most recent copy. */

	disk_info = (__le16 *) si->si_bh[0]->b_data;

	sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;



	for (i = 0; i < si->si_num_slots; i++) {

		if (le16_to_cpu(disk_info[i]) == (u16)OCFS2_INVALID_SLOT)

		if (le16_to_cpu(sm->sm_slots[i]) == (u16)OCFS2_INVALID_SLOT)

			ocfs2_invalidate_slot(si, i);

		else

			ocfs2_set_slot(si, i, le16_to_cpu(disk_info[i]));

			ocfs2_set_slot(si, i, le16_to_cpu(sm->sm_slots[i]));

	}

}
@@ -135,15 +135,16 @@ static int ocfs2_update_disk_slots(struct ocfs2_super *osb, 
				   struct ocfs2_slot_info *si)

{

	int status, i;

	__le16 *disk_info = (__le16 *) si->si_bh[0]->b_data;

	struct ocfs2_slot_map *sm;



	spin_lock(&osb->osb_lock);

	sm = (struct ocfs2_slot_map *)si->si_bh[0]->b_data;

	for (i = 0; i < si->si_num_slots; i++) {

		if (si->si_slots[i].sl_valid)

			disk_info[i] =

			sm->sm_slots[i] =

				cpu_to_le16(si->si_slots[i].sl_node_num);

		else

			disk_info[i] = cpu_to_le16(OCFS2_INVALID_SLOT);

			sm->sm_slots[i] = cpu_to_le16(OCFS2_INVALID_SLOT);

	}

	spin_unlock(&osb->osb_lock);