linux/fs/ceph, branch v3.0-rc2

ceph: fix cap flush race reentrancy

2011-05-24T18:52:12Z

In e9964c10 we change cap flushing to do a delicate dance because some inodes on the cap_dirty list could be in a migrating state (got EXPORT but not IMPORT) in which we couldn't actually flush and move from dirty->flushing, breaking the while (!empty) { process first } loop structure. It worked for a single sync thread, but was not reentrant and triggered infinite loops when multiple syncers came along. Instead, move inodes with dirty to a separate cap_dirty_migrating list when in the limbo export-but-no-import state, allowing us to go back to the simple loop structure (which was reentrant). This is cleaner and more robust. Audited the cap_dirty users and this looks fine: list_empty(&ci->i_dirty_item) is still a reliable indicator of whether we have dirty caps (which list we're on is irrelevant) and list_del_init() calls still do the right thing. Signed-off-by: Sage Weil

ceph: avoid inode lookup on nfs fh reconnect

2011-05-24T18:52:06Z

If we get the inode from the MDS, we have a reference in req; don't do a fresh lookup. Signed-off-by: Sage Weil

ceph: use LOOKUPINO to make unconnected nfs fh more reliable

2011-05-24T18:52:05Z

If we are unable to locate an inode by ino, ask the MDS using the new LOOKUPINO command. Signed-off-by: Sage Weil

ceph: check return value for start_request in writepages

2011-05-19T18:25:05Z

Since we pass the nofail arg, we should never get an error; BUG if we do. (And fix the function to not return an error if __map_request fails.) Signed-off-by: Sage Weil

ceph: remove useless check

2011-05-19T18:25:05Z

rc is only ever 0 or negative in this method. Signed-off-by: Sage Weil

ceph: fix broken comparison in readdir loop

2011-05-19T18:25:04Z

Both off and fi->offset are unsigned, so the difference is always >= 0. Compare them directly instead of the sign of the difference. Signed-off-by: Sage Weil

ceph: fix rare potential cap leak

2011-05-19T18:25:03Z

If we grab new_cap, retake the lock, and find we already have a cap now for the given mds, release new_cap. Signed-off-by: Sage Weil

ceph: use snprintf for dirstat content

2011-05-19T18:25:02Z

We allocate a buffer for rstats if the dirstat option is enabled. Use snprintf. Signed-off-by: Sage Weil

libceph: remove unused variable

2011-05-19T18:24:17Z

Signed-off-by: Sage Weil

ceph: take reference on mds request r_unsafe_dir

2011-05-19T18:20:07Z

We put ourselves on an inode list for the parent directory of metadata operations so that an fsync on the directory will wait for metadata updates to commit to disk. We weren't holding a reference to that directory, however, and under certain workloads (fsstress in this case) the directory can go away. Signed-off-by: Sage Weil