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Commit 85ccce43 authored by Sage Weil's avatar Sage Weil
Browse files

ceph: clean up readdir caps reservation 



Use a global counter for the minimum number of allocated caps instead of
hard coding a check against readdir_max.  This takes into account multiple
client instances, and avoids examining the superblock mount options when a
cap is dropped.

Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent 5ce6e9db

fs/ceph/caps.c

+17 −6
Original line number Diff line number Diff line
@@ -128,6 +128,7 @@ static int caps_total_count; /* total caps allocated */ 
static int caps_use_count;          /* in use */

static int caps_reserve_count;      /* unused, reserved */

static int caps_avail_count;        /* unused, unreserved */

static int caps_min_count;          /* keep at least this many (unreserved) */



void __init ceph_caps_init(void)

{
@@ -149,6 +150,15 @@ void ceph_caps_finalize(void) 
	caps_avail_count = 0;

	caps_use_count = 0;

	caps_reserve_count = 0;

	caps_min_count = 0;

	spin_unlock(&caps_list_lock);

}



void ceph_adjust_min_caps(int delta)

{

	spin_lock(&caps_list_lock);

	caps_min_count += delta;

	BUG_ON(caps_min_count < 0);

	spin_unlock(&caps_list_lock);

}
@@ -265,12 +275,10 @@ static void put_cap(struct ceph_cap *cap, 
	     caps_reserve_count, caps_avail_count);

	caps_use_count--;

	/*

	 * Keep some preallocated caps around, at least enough to do a

	 * readdir (which needs to preallocate lots of them), to avoid

	 * lots of free/alloc churn.

	 * Keep some preallocated caps around (ceph_min_count), to

	 * avoid lots of free/alloc churn.

	 */

	if (caps_avail_count >= caps_reserve_count +

	    ceph_client(cap->ci->vfs_inode.i_sb)->mount_args->max_readdir) {

	if (caps_avail_count >= caps_reserve_count + caps_min_count) {

		caps_total_count--;

		kmem_cache_free(ceph_cap_cachep, cap);

	} else {
@@ -289,7 +297,8 @@ static void put_cap(struct ceph_cap *cap, 
}



void ceph_reservation_status(struct ceph_client *client,

			     int *total, int *avail, int *used, int *reserved)

			     int *total, int *avail, int *used, int *reserved,

			     int *min)

{

	if (total)

		*total = caps_total_count;
@@ -299,6 +308,8 @@ void ceph_reservation_status(struct ceph_client *client, 
		*used = caps_use_count;

	if (reserved)

		*reserved = caps_reserve_count;

	if (min)

		*min = caps_min_count;

}



/*

fs/ceph/debugfs.c

+7 −6
Original line number Diff line number Diff line
@@ -255,14 +255,15 @@ static int osdc_show(struct seq_file *s, void *pp) 
static int caps_show(struct seq_file *s, void *p)

{

	struct ceph_client *client = p;

	int total, avail, used, reserved;

	int total, avail, used, reserved, min;



	ceph_reservation_status(client, &total, &avail, &used, &reserved);

	ceph_reservation_status(client, &total, &avail, &used, &reserved, &min);

	seq_printf(s, "total\t\t%d\n"

		   "avail\t\t%d\n"

		   "used\t\t%d\n"

		      "reserved\t%d\n",

		   total, avail, used, reserved);

		   "reserved\t%d\n"

		   "min\t%d\n",

		   total, avail, used, reserved, min);

	return 0;

}

fs/ceph/super.c

+5 −0
Original line number Diff line number Diff line
@@ -578,6 +578,9 @@ static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) 
	if (!client->wb_pagevec_pool)

		goto fail_trunc_wq;



	/* caps */

	client->min_caps = args->max_readdir;

	ceph_adjust_min_caps(client->min_caps);



	/* subsystems */

	err = ceph_monc_init(&client->monc, client);
@@ -619,6 +622,8 @@ static void ceph_destroy_client(struct ceph_client *client) 
	ceph_monc_stop(&client->monc);

	ceph_osdc_stop(&client->osdc);



	ceph_adjust_min_caps(-client->min_caps);



	ceph_debugfs_client_cleanup(client);

	destroy_workqueue(client->wb_wq);

	destroy_workqueue(client->pg_inv_wq);

fs/ceph/super.h

+4 −1
Original line number Diff line number Diff line
@@ -129,6 +129,8 @@ struct ceph_client { 


	int auth_err;



	int min_caps;                  /* min caps i added */



	struct ceph_messenger *msgr;   /* messenger instance */

	struct ceph_mon_client monc;

	struct ceph_mds_client mdsc;
@@ -557,11 +559,12 @@ extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 


extern void ceph_caps_init(void);

extern void ceph_caps_finalize(void);

extern void ceph_adjust_min_caps(int delta);

extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need);

extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx);

extern void ceph_reservation_status(struct ceph_client *client,

				    int *total, int *avail, int *used,

				    int *reserved);

				    int *reserved, int *min);



static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)

{