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libceph: store timeouts in jiffies, verify user input

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There are currently three libceph-level timeouts that the user can
specify on mount: mount_timeout, osd_idle_ttl and osdkeepalive.  All of
these are in seconds and no checking is done on user input: negative
values are accepted, we multiply them all by HZ which may or may not
overflow, arbitrarily large jiffies then get added together, etc.

There is also a bug in the way mount_timeout=0 is handled.  It's
supposed to mean "infinite timeout", but that's not how wait.h APIs
treat it and so __ceph_open_session() for example will busy loop
without much chance of being interrupted if none of ceph-mons are
there.

Fix all this by verifying user input, storing timeouts capped by
msecs_to_jiffies() in jiffies and using the new ceph_timeout_jiffies()
helper for all user-specified waits to handle infinite timeouts
correctly.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Ilya Dryomov
2015-05-15 12:02:17 +03:00
parent d50c97b566
commit a319bf56a6
9 changed files with 71 additions and 38 deletions
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15
net/ceph/osd_client.c
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@@ -1097,7 +1097,7 @@ static void __move_osd_to_lru(struct ceph_osd_client *osdc,
BUG_ON(!list_empty(&osd->o_osd_lru));
list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl;
}
static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
@@ -1208,7 +1208,7 @@ static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
{
schedule_delayed_work(&osdc->timeout_work,
osdc->client->options->osd_keepalive_timeout * HZ);
osdc->client->options->osd_keepalive_timeout);
}
static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
@@ -1576,10 +1576,9 @@ static void handle_timeout(struct work_struct *work)
{
struct ceph_osd_client *osdc =
container_of(work, struct ceph_osd_client, timeout_work.work);
struct ceph_options *opts = osdc->client->options;
struct ceph_osd_request *req;
struct ceph_osd *osd;
unsigned long keepalive =
osdc->client->options->osd_keepalive_timeout * HZ;
struct list_head slow_osds;
dout("timeout\n");
down_read(&osdc->map_sem);
@@ -1595,7 +1594,8 @@ static void handle_timeout(struct work_struct *work)
*/
INIT_LIST_HEAD(&slow_osds);
list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
if (time_before(jiffies, req->r_stamp + keepalive))
if (time_before(jiffies,
req->r_stamp + opts->osd_keepalive_timeout))
break;
osd = req->r_osd;
@@ -1622,8 +1622,7 @@ static void handle_osds_timeout(struct work_struct *work)
struct ceph_osd_client *osdc =
container_of(work, struct ceph_osd_client,
osds_timeout_work.work);
unsigned long delay =
osdc->client->options->osd_idle_ttl * HZ >> 2;
unsigned long delay = osdc->client->options->osd_idle_ttl / 4;
dout("osds timeout\n");
down_read(&osdc->map_sem);
@@ -2628,7 +2627,7 @@ int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
osdc->event_count = 0;
schedule_delayed_work(&osdc->osds_timeout_work,
round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
round_jiffies_relative(osdc->client->options->osd_idle_ttl));
err = -ENOMEM;
osdc->req_mempool = mempool_create_kmalloc_pool(10,