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| author | Christoph Hellwig <hch@lst.de> | 2014-09-23 14:38:48 +0400 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2015-02-02 20:09:43 +0300 |
| commit | c5c707f96fc9a6e5a57ca5baac892673270abe3d (patch) | |
| tree | 358247cff990d703ef8860e1e46e201d3974bf0b /fs/nfsd/xdr4cb.h | |
| parent | 9cf514ccfacb301f3b1b4509a8ce25dffad55880 (diff) | |
| download | linux-c5c707f96fc9a6e5a57ca5baac892673270abe3d.tar.xz | |
nfsd: implement pNFS layout recalls
Add support to issue layout recalls to clients. For now we only support
full-file recalls to get a simple and stable implementation. This allows
to embedd a nfsd4_callback structure in the layout_state and thus avoid
any memory allocations under spinlocks during a recall. For normal
use cases that do not intent to share a single file between multiple
clients this implementation is fully sufficient.
To ensure layouts are recalled on local filesystem access each layout
state registers a new FL_LAYOUT lease with the kernel file locking code,
which filesystems that support pNFS exports that require recalls need
to break on conflicting access patterns.
The XDR code is based on the old pNFS server implementation by
Andy Adamson, Benny Halevy, Boaz Harrosh, Dean Hildebrand, Fred Isaman,
Marc Eshel, Mike Sager and Ricardo Labiaga.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/nfsd/xdr4cb.h')
| -rw-r--r-- | fs/nfsd/xdr4cb.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/nfsd/xdr4cb.h b/fs/nfsd/xdr4cb.h index c5c55dfb91a9..c47f6fdb111a 100644 --- a/fs/nfsd/xdr4cb.h +++ b/fs/nfsd/xdr4cb.h @@ -21,3 +21,10 @@ #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ cb_sequence_dec_sz + \ op_dec_sz) +#define NFS4_enc_cb_layout_sz (cb_compound_enc_hdr_sz + \ + cb_sequence_enc_sz + \ + 1 + 3 + \ + enc_nfs4_fh_sz + 4) +#define NFS4_dec_cb_layout_sz (cb_compound_dec_hdr_sz + \ + cb_sequence_dec_sz + \ + op_dec_sz) |