Commit 83f92318 authored by Mark Fasheh's avatar Mark Fasheh Committed by Joel Becker
Browse files

ocfs2: Add dir_resv_level mount option 



The default behavior for directory reservations stays the same, but we add a
mount option so people can tweak the size of directory reservations
according to their workloads.

Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
parent b07f8f24

Documentation/filesystems/ocfs2.txt

+4 −0
Original line number Diff line number Diff line
@@ -83,3 +83,7 @@ noacl (*) Disables POSIX Access Control Lists support. 
resv_level=2	(*)	Set how agressive allocation reservations will be.

			Valid values are between 0 (reservations off) to 8

			(maximum space for reservations).

dir_resv_level=	(*)	By default, directory reservations will scale with file

			reservations - users should rarely need to change this

			value. If allocation reservations are turned off, this

			option will have no effect.

fs/ocfs2/dir.c

+4 −2
Original line number Diff line number Diff line
@@ -2977,6 +2977,7 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, 
	 * if we only get one now, that's enough to continue. The rest

	 * will be claimed after the conversion to extents.

	 */

	if (ocfs2_dir_resv_allowed(osb))

		data_ac->ac_resv = &oi->ip_la_data_resv;

	ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);

	if (ret) {
@@ -3348,6 +3349,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb, 
			goto bail;

		}



		if (ocfs2_dir_resv_allowed(osb))

			data_ac->ac_resv = &OCFS2_I(dir)->ip_la_data_resv;



		credits = ocfs2_calc_extend_credits(sb, el, 1);

fs/ocfs2/ocfs2.h

+1 −0
Original line number Diff line number Diff line
@@ -356,6 +356,7 @@ struct ocfs2_super 
	struct ocfs2_reservation_map	osb_la_resmap;



	unsigned int	osb_resv_level;

	unsigned int	osb_dir_resv_level;



	/* Next three fields are for local node slot recovery during

	 * mount. */

fs/ocfs2/reservations.c

+6 −3
Original line number Diff line number Diff line
@@ -44,7 +44,11 @@ DEFINE_SPINLOCK(resv_lock); 


#define	OCFS2_MIN_RESV_WINDOW_BITS	8

#define	OCFS2_MAX_RESV_WINDOW_BITS	1024

#define	OCFS2_RESV_DIR_WINDOW_BITS	OCFS2_MIN_RESV_WINDOW_BITS



int ocfs2_dir_resv_allowed(struct ocfs2_super *osb)

{

	return (osb->osb_resv_level && osb->osb_dir_resv_level);

}



static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap,

					   struct ocfs2_alloc_reservation *resv)
@@ -56,8 +60,7 @@ static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap, 
		/* 8, 16, 32, 64, 128, 256, 512, 1024 */

		bits = 4 << osb->osb_resv_level;

	} else {

		/* For now, treat directories the same as files. */

		bits = 4 << osb->osb_resv_level;

		bits = 4 << osb->osb_dir_resv_level;

	}

	return bits;

}

fs/ocfs2/reservations.h

+2 −0
Original line number Diff line number Diff line
@@ -67,6 +67,8 @@ void ocfs2_resv_init_once(struct ocfs2_alloc_reservation *resv); 
void ocfs2_resv_set_type(struct ocfs2_alloc_reservation *resv,

			 unsigned int flags);



int ocfs2_dir_resv_allowed(struct ocfs2_super *osb);



/**

 * ocfs2_resv_discard() - truncate a reservation

 * @resmap:

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