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authorIlya Dryomov <idryomov@gmail.com>2015-05-15 12:02:17 +0300
committerIlya Dryomov <idryomov@gmail.com>2015-06-25 11:49:29 +0300
commita319bf56a617354e62cf5f774d2ca4e1a8a3bff3 (patch)
treecf54ed20b02c8488a342f54fd573eb57df964a3c /fs/ceph
parentd50c97b566c5bbf990eff472e9feaa58fdebdd33 (diff)
downloadlinux-a319bf56a617354e62cf5f774d2ca4e1a8a3bff3.tar.xz
libceph: store timeouts in jiffies, verify user input
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>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/dir.c4
-rw-r--r--fs/ceph/mds_client.c12
-rw-r--r--fs/ceph/mds_client.h2
-rw-r--r--fs/ceph/super.c2
4 files changed, 10 insertions, 10 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 4248307fea90..173dd4b58c71 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1259,8 +1259,8 @@ static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
inode, req->r_tid, last_tid);
if (req->r_timeout) {
unsigned long time_left = wait_for_completion_timeout(
- &req->r_safe_completion,
- req->r_timeout);
+ &req->r_safe_completion,
+ ceph_timeout_jiffies(req->r_timeout));
if (time_left > 0)
ret = 0;
else
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 69a36f40517f..0b0e0a9a81c0 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2268,7 +2268,8 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
dout("do_request waiting\n");
if (req->r_timeout) {
err = (long)wait_for_completion_killable_timeout(
- &req->r_completion, req->r_timeout);
+ &req->r_completion,
+ ceph_timeout_jiffies(req->r_timeout));
if (err == 0)
err = -EIO;
} else if (req->r_wait_for_completion) {
@@ -3424,8 +3425,8 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
*/
static void wait_requests(struct ceph_mds_client *mdsc)
{
+ struct ceph_options *opts = mdsc->fsc->client->options;
struct ceph_mds_request *req;
- struct ceph_fs_client *fsc = mdsc->fsc;
mutex_lock(&mdsc->mutex);
if (__get_oldest_req(mdsc)) {
@@ -3433,7 +3434,7 @@ static void wait_requests(struct ceph_mds_client *mdsc)
dout("wait_requests waiting for requests\n");
wait_for_completion_timeout(&mdsc->safe_umount_waiters,
- fsc->client->options->mount_timeout * HZ);
+ ceph_timeout_jiffies(opts->mount_timeout));
/* tear down remaining requests */
mutex_lock(&mdsc->mutex);
@@ -3556,10 +3557,9 @@ static bool done_closing_sessions(struct ceph_mds_client *mdsc)
*/
void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
{
+ struct ceph_options *opts = mdsc->fsc->client->options;
struct ceph_mds_session *session;
int i;
- struct ceph_fs_client *fsc = mdsc->fsc;
- unsigned long timeout = fsc->client->options->mount_timeout * HZ;
dout("close_sessions\n");
@@ -3580,7 +3580,7 @@ void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
dout("waiting for sessions to close\n");
wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
- timeout);
+ ceph_timeout_jiffies(opts->mount_timeout));
/* tear down remaining sessions */
mutex_lock(&mdsc->mutex);
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 2ef799961ebb..509d6822e9b1 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -227,7 +227,7 @@ struct ceph_mds_request {
int r_err;
bool r_aborted;
- unsigned long r_timeout; /* optional. jiffies */
+ unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
unsigned long r_started; /* start time to measure timeout against */
unsigned long r_request_started; /* start time for mds request only,
used to measure lease durations */
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 9a5350030af8..edeb83c43112 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -742,7 +742,7 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
req->r_ino1.ino = CEPH_INO_ROOT;
req->r_ino1.snap = CEPH_NOSNAP;
req->r_started = started;
- req->r_timeout = fsc->client->options->mount_timeout * HZ;
+ req->r_timeout = fsc->client->options->mount_timeout;
req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
req->r_num_caps = 2;
err = ceph_mdsc_do_request(mdsc, NULL, req);