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The MDS (metadata server) client is responsible for submitting requests to the MDS cluster and parsing the response. We decide which MDS to submit each request to based on cached information about the current partition of the directory hierarchy across the cluster. A stateful session is opened with each MDS before we submit requests to it, and a mutex is used to control the ordering of messages within each session. An MDS request may generate two responses. The first indicates the operation was a success and returns any result. A second reply is sent when the operation commits to disk. Note that locking on the MDS ensures that the results of updates are visible only to the updating client before the operation commits. Requests are linked to the containing directory so that an fsync will wait for them to commit. If an MDS fails and/or recovers, we resubmit requests as needed. We also reconnect existing capabilities to a recovering MDS to reestablish that shared session state. Old dentry leases are invalidated. Signed-off-by: Sage Weil <sage@newdream.net> |
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| .. | ||
| addr.c | ||
| buffer.c | ||
| buffer.h | ||
| ceph_debug.h | ||
| ceph_frag.c | ||
| ceph_frag.h | ||
| ceph_fs.c | ||
| ceph_fs.h | ||
| ceph_strings.c | ||
| ceph_ver.h | ||
| dir.c | ||
| file.c | ||
| inode.c | ||
| mds_client.c | ||
| mds_client.h | ||
| mdsmap.c | ||
| mdsmap.h | ||
| msgr.h | ||
| rados.h | ||
| super.c | ||
| super.h | ||
| types.h | ||
| xattr.c | ||