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authorYan, Zheng <zyan@redhat.com>2019-02-01 14:57:15 +0800
committerIlya Dryomov <idryomov@gmail.com>2019-03-05 18:55:17 +0100
commitfe33032daae2e584d9e7e33bab44c9eafced1f8f (patch)
treea03be95fd94ffcd66c69e2146a1930837f769eb4 /fs/ceph
parent37c4efc1ddf98ba8b234d116d863a9464445901e (diff)
downloadlinux-stericsson-fe33032daae2e584d9e7e33bab44c9eafced1f8f.tar.gz
ceph: add mount option to limit caps count
If number of caps exceed the limit, ceph_trim_dentires() also trim dentries with valid leases. Trimming dentry releases references to associated inode, which may evict inode and release caps. By default, there is no limit for caps count. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/caps.c33
-rw-r--r--fs/ceph/dir.c20
-rw-r--r--fs/ceph/mds_client.c34
-rw-r--r--fs/ceph/mds_client.h3
-rw-r--r--fs/ceph/super.c12
-rw-r--r--fs/ceph/super.h5
6 files changed, 86 insertions, 21 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 6fbdc1a0afbe..36a8dc699448 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -148,11 +148,17 @@ void ceph_caps_finalize(struct ceph_mds_client *mdsc)
spin_unlock(&mdsc->caps_list_lock);
}
-void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
+void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
+ struct ceph_mount_options *fsopt)
{
spin_lock(&mdsc->caps_list_lock);
- mdsc->caps_min_count += delta;
- BUG_ON(mdsc->caps_min_count < 0);
+ mdsc->caps_min_count = fsopt->max_readdir;
+ if (mdsc->caps_min_count < 1024)
+ mdsc->caps_min_count = 1024;
+ mdsc->caps_use_max = fsopt->caps_max;
+ if (mdsc->caps_use_max > 0 &&
+ mdsc->caps_use_max < mdsc->caps_min_count)
+ mdsc->caps_use_max = mdsc->caps_min_count;
spin_unlock(&mdsc->caps_list_lock);
}
@@ -272,6 +278,7 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc,
if (!err) {
BUG_ON(have + alloc != need);
ctx->count = need;
+ ctx->used = 0;
}
spin_lock(&mdsc->caps_list_lock);
@@ -295,13 +302,24 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc,
}
void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
- struct ceph_cap_reservation *ctx)
+ struct ceph_cap_reservation *ctx)
{
+ bool reclaim = false;
+ if (!ctx->count)
+ return;
+
dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
spin_lock(&mdsc->caps_list_lock);
__ceph_unreserve_caps(mdsc, ctx->count);
ctx->count = 0;
+
+ if (mdsc->caps_use_max > 0 &&
+ mdsc->caps_use_count > mdsc->caps_use_max)
+ reclaim = true;
spin_unlock(&mdsc->caps_list_lock);
+
+ if (reclaim)
+ ceph_reclaim_caps_nr(mdsc, ctx->used);
}
struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
@@ -346,6 +364,7 @@ struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
BUG_ON(list_empty(&mdsc->caps_list));
ctx->count--;
+ ctx->used++;
mdsc->caps_reserve_count--;
mdsc->caps_use_count++;
@@ -500,12 +519,12 @@ static void __insert_cap_node(struct ceph_inode_info *ci,
static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
struct ceph_inode_info *ci)
{
- struct ceph_mount_options *ma = mdsc->fsc->mount_options;
+ struct ceph_mount_options *opt = mdsc->fsc->mount_options;
ci->i_hold_caps_min = round_jiffies(jiffies +
- ma->caps_wanted_delay_min * HZ);
+ opt->caps_wanted_delay_min * HZ);
ci->i_hold_caps_max = round_jiffies(jiffies +
- ma->caps_wanted_delay_max * HZ);
+ opt->caps_wanted_delay_max * HZ);
dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
}
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index eba283557653..a8f429882249 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1224,6 +1224,7 @@ enum {
struct ceph_lease_walk_control {
bool dir_lease;
+ bool expire_dir_lease;
unsigned long nr_to_scan;
unsigned long dir_lease_ttl;
};
@@ -1345,7 +1346,13 @@ static int __dir_lease_check(struct dentry *dentry, void *arg)
/* Move dentry to tail of dir lease list if we don't want
* to delete it. So dentries in the list are checked in a
* round robin manner */
- return TOUCH;
+ if (!lwc->expire_dir_lease)
+ return TOUCH;
+ if (dentry->d_lockref.count > 0 ||
+ (di->flags & CEPH_DENTRY_REFERENCED))
+ return TOUCH;
+ /* invalidate dir lease */
+ di->lease_shared_gen = 0;
}
return DELETE;
}
@@ -1353,8 +1360,17 @@ static int __dir_lease_check(struct dentry *dentry, void *arg)
int ceph_trim_dentries(struct ceph_mds_client *mdsc)
{
struct ceph_lease_walk_control lwc;
+ unsigned long count;
unsigned long freed;
+ spin_lock(&mdsc->caps_list_lock);
+ if (mdsc->caps_use_max > 0 &&
+ mdsc->caps_use_count > mdsc->caps_use_max)
+ count = mdsc->caps_use_count - mdsc->caps_use_max;
+ else
+ count = 0;
+ spin_unlock(&mdsc->caps_list_lock);
+
lwc.dir_lease = false;
lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;
freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check);
@@ -1365,6 +1381,8 @@ int ceph_trim_dentries(struct ceph_mds_client *mdsc)
lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
lwc.dir_lease = true;
+ lwc.expire_dir_lease = freed < count;
+ lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;
freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check);
if (!lwc.nr_to_scan) /* more to check */
return -EAGAIN;
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 2095e5d038f8..21c33ed048ed 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1965,6 +1965,18 @@ void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
}
}
+void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
+{
+ int val;
+ if (!nr)
+ return;
+ val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
+ if (!(val % CEPH_CAPS_PER_RELEASE)) {
+ atomic_set(&mdsc->cap_reclaim_pending, 0);
+ ceph_queue_cap_reclaim_work(mdsc);
+ }
+}
+
/*
* requests
*/
@@ -2878,7 +2890,6 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
req->r_op == CEPH_MDS_OP_LSSNAP))
ceph_readdir_prepopulate(req, req->r_session);
- ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
current->journal_info = NULL;
mutex_unlock(&req->r_fill_mutex);
@@ -2887,12 +2898,18 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
if (realm)
ceph_put_snap_realm(mdsc, realm);
- if (err == 0 && req->r_target_inode &&
- test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
- struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
- spin_lock(&ci->i_unsafe_lock);
- list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
- spin_unlock(&ci->i_unsafe_lock);
+ if (err == 0) {
+ if (req->r_target_inode &&
+ test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
+ struct ceph_inode_info *ci =
+ ceph_inode(req->r_target_inode);
+ spin_lock(&ci->i_unsafe_lock);
+ list_add_tail(&req->r_unsafe_target_item,
+ &ci->i_unsafe_iops);
+ spin_unlock(&ci->i_unsafe_lock);
+ }
+
+ ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
}
out_err:
mutex_lock(&mdsc->mutex);
@@ -4083,13 +4100,14 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
spin_lock_init(&mdsc->cap_dirty_lock);
init_waitqueue_head(&mdsc->cap_flushing_wq);
INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
+ atomic_set(&mdsc->cap_reclaim_pending, 0);
spin_lock_init(&mdsc->dentry_list_lock);
INIT_LIST_HEAD(&mdsc->dentry_leases);
INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
ceph_caps_init(mdsc);
- ceph_adjust_min_caps(mdsc, fsc->min_caps);
+ ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
spin_lock_init(&mdsc->snapid_map_lock);
mdsc->snapid_map_tree = RB_ROOT;
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 580b235f343b..50385a481fdb 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -379,6 +379,7 @@ struct ceph_mds_client {
wait_queue_head_t cap_flushing_wq;
struct work_struct cap_reclaim_work;
+ atomic_t cap_reclaim_pending;
/*
* Cap reservations
@@ -396,6 +397,7 @@ struct ceph_mds_client {
unreserved) */
int caps_total_count; /* total caps allocated */
int caps_use_count; /* in use */
+ int caps_use_max; /* max used caps */
int caps_reserve_count; /* unused, reserved */
int caps_avail_count; /* unused, unreserved */
int caps_min_count; /* keep at least this many
@@ -465,6 +467,7 @@ extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session);
extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
+extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 200836bcf542..6d5bb2f74612 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -133,6 +133,7 @@ enum {
Opt_rasize,
Opt_caps_wanted_delay_min,
Opt_caps_wanted_delay_max,
+ Opt_caps_max,
Opt_readdir_max_entries,
Opt_readdir_max_bytes,
Opt_congestion_kb,
@@ -175,6 +176,7 @@ static match_table_t fsopt_tokens = {
{Opt_rasize, "rasize=%d"},
{Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"},
{Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"},
+ {Opt_caps_max, "caps_max=%d"},
{Opt_readdir_max_entries, "readdir_max_entries=%d"},
{Opt_readdir_max_bytes, "readdir_max_bytes=%d"},
{Opt_congestion_kb, "write_congestion_kb=%d"},
@@ -286,6 +288,11 @@ static int parse_fsopt_token(char *c, void *private)
return -EINVAL;
fsopt->caps_wanted_delay_max = intval;
break;
+ case Opt_caps_max:
+ if (intval < 0)
+ return -EINVAL;
+ fsopt->caps_max = intval;
+ break;
case Opt_readdir_max_entries:
if (intval < 1)
return -EINVAL;
@@ -576,6 +583,8 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
seq_printf(m, ",rasize=%d", fsopt->rasize);
if (fsopt->congestion_kb != default_congestion_kb())
seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb);
+ if (fsopt->caps_max)
+ seq_printf(m, ",caps_max=%d", fsopt->caps_max);
if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT)
seq_printf(m, ",caps_wanted_delay_min=%d",
fsopt->caps_wanted_delay_min);
@@ -683,9 +692,6 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
if (!fsc->wb_pagevec_pool)
goto fail_cap_wq;
- /* caps */
- fsc->min_caps = fsopt->max_readdir;
-
return fsc;
fail_cap_wq:
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index b3bcfb3c27bd..16c03188578e 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -79,6 +79,7 @@ struct ceph_mount_options {
int rasize; /* max readahead */
int congestion_kb; /* max writeback in flight */
int caps_wanted_delay_min, caps_wanted_delay_max;
+ int caps_max;
int max_readdir; /* max readdir result (entires) */
int max_readdir_bytes; /* max readdir result (bytes) */
@@ -100,7 +101,6 @@ struct ceph_fs_client {
struct ceph_client *client;
unsigned long mount_state;
- int min_caps; /* min caps i added */
loff_t max_file_size;
struct ceph_mds_client *mdsc;
@@ -668,7 +668,8 @@ extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
extern void ceph_caps_init(struct ceph_mds_client *mdsc);
extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
-extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
+extern void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc,
+ struct ceph_mount_options *fsopt);
extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
struct ceph_cap_reservation *ctx, int need);
extern void ceph_unreserve_caps(struct ceph_mds_client *mdsc,