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ceph: handle SESSION_FORCE_RO message

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mark session as readonly and wake up all cap waiters.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2015-01-05 11:04:04 +08:00 committed by Ilya Dryomov
parent f646912d10
commit 03f4fcb028
4 changed files with 27 additions and 0 deletions
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15
fs/ceph/caps.c
View File

@ -2143,6 +2143,21 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
ret = 1;
}
} else {
int session_readonly = false;
if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
struct ceph_mds_session *s = ci->i_auth_cap->session;
spin_lock(&s->s_cap_lock);
session_readonly = s->s_readonly;
spin_unlock(&s->s_cap_lock);
}
if (session_readonly) {
dout("get_cap_refs %p needed %s but mds%d readonly\n",
inode, ceph_cap_string(need), ci->i_auth_cap->mds);
*err = -EROFS;
ret = 1;
goto out_unlock;
}
dout("get_cap_refs %p have %s needed %s\n", inode,
ceph_cap_string(have), ceph_cap_string(need));
}

10
fs/ceph/mds_client.c
View File

@ -2580,6 +2580,14 @@ static void handle_session(struct ceph_mds_session *session,
send_flushmsg_ack(mdsc, session, seq);
break;
case CEPH_SESSION_FORCE_RO:
dout("force_session_readonly %p\n", session);
spin_lock(&session->s_cap_lock);
session->s_readonly = true;
spin_unlock(&session->s_cap_lock);
wake_up_session_caps(session, 0);
break;
default:
pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
WARN_ON(1);
@ -2791,6 +2799,8 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
spin_unlock(&session->s_gen_ttl_lock);
spin_lock(&session->s_cap_lock);
/* don't know if session is readonly */
session->s_readonly = 0;
/*
* notify __ceph_remove_cap() that we are composing cap reconnect.
* If a cap get released before being added to the cap reconnect,

1
fs/ceph/mds_client.h
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@ -137,6 +137,7 @@ struct ceph_mds_session {
int s_nr_caps, s_trim_caps;
int s_num_cap_releases;
int s_cap_reconnect;
int s_readonly;
struct list_head s_cap_releases; /* waiting cap_release messages */
struct list_head s_cap_releases_done; /* ready to send */
struct ceph_cap *s_cap_iterator;

1
include/linux/ceph/ceph_fs.h
View File

@ -271,6 +271,7 @@ enum {
CEPH_SESSION_RECALL_STATE,
CEPH_SESSION_FLUSHMSG,
CEPH_SESSION_FLUSHMSG_ACK,
CEPH_SESSION_FORCE_RO,
};
extern const char *ceph_session_op_name(int op);