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| author | Fred Isaman <iisaman@netapp.com> | 2011-01-06 11:36:23 +0000 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 14:46:31 -0500 |
| commit | 4541d16c024ce40a0781e03c185ecdfe34aec46f (patch) | |
| tree | 53574211b3de874869b09644b8de872ccf2d4fe1 /fs/nfs/pnfs.h | |
| parent | fd6002e9b8a93220d5f53b93d9624caf73cdc8a2 (diff) | |
| download | lwn-4541d16c024ce40a0781e03c185ecdfe34aec46f.tar.gz lwn-4541d16c024ce40a0781e03c185ecdfe34aec46f.zip | |
pnfs: change how lsegs are removed from layout list
This is to prepare the way for sensible io draining. Instead of just
removing the lseg from the list, we instead clear the VALID flag
(preventing new io from grabbing references to the lseg) and remove
the reference holding it in the list. Thus the lseg will be removed
once any io in progress completes and any references still held are
dropped.
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/pnfs.h')
| -rw-r--r-- | fs/nfs/pnfs.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 10937203d236..787253e6fca3 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -30,10 +30,15 @@ #ifndef FS_NFS_PNFS_H #define FS_NFS_PNFS_H +enum { + NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ +}; + struct pnfs_layout_segment { struct list_head pls_list; struct pnfs_layout_range pls_range; - struct kref pls_refcount; + atomic_t pls_refcount; + unsigned long pls_flags; struct pnfs_layout_hdr *pls_layout; }; @@ -44,6 +49,7 @@ struct pnfs_layout_segment { enum { NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ + NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ }; /* Per-layout driver specific registration structure */ |