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| author |   Fred Isaman <iisaman@netapp.com> | 2011-01-06 11:36:22 +0000 |
|---|---|---|
| committer |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 14:46:31 -0500 |
| commit | fd6002e9b8a93220d5f53b93d9624caf73cdc8a2 (patch) | |
| tree | f45c22c9ec855949b1ec0488162229df4eb3f5ed /crypto | |
| parent | pnfs: add prefix to struct pnfs_layout_hdr fields (diff) | |
| download | linux-dev-fd6002e9b8a93220d5f53b93d9624caf73cdc8a2.tar.xz linux-dev-fd6002e9b8a93220d5f53b93d9624caf73cdc8a2.zip | |
pnfs: change layout state seqlock to a spinlock
This prepares for future changes, where the layout state needs
to change atomically with several other variables. In particular,
it will need to know if lo->segs is empty, as we test that instead
of manipulating the NFS_LAYOUT_STATEID_SET bit. Moreover, the
layoutstateid is not really a read-mostly structure, as it is
written almost as often as it is read.
The behavior of pnfs_get_layout_stateid is also slightly changed, so that
it no longer changes the stateid. Its name is changed to +pnfs_choose_layoutget_stateid.
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions