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authorFred Isaman <iisaman@netapp.com>2012-04-20 14:47:44 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-27 14:10:37 -0400
commitcd841605f7a721878d8a2d1362484723d8abf569 (patch)
treeb5c37db575cd545a183577249909e042fe38d646 /fs/nfs/internal.h
parentb5542849764aa56fd3f05c0041195b637b9d2ac2 (diff)
downloadop-kernel-dev-cd841605f7a721878d8a2d1362484723d8abf569.zip
op-kernel-dev-cd841605f7a721878d8a2d1362484723d8abf569.tar.gz
NFS: create common nfs_pgio_header for both read and write
In order to avoid duplicating all the data in nfs_read_data whenever we split it up into multiple RPC calls (either due to a short read result or due to rsize < PAGE_SIZE), we split out the bits that are the same per RPC call into a separate "header" structure. The goal this patch moves towards is to have a single header refcounted by several rpc_data structures. Thus, want to always refer from rpc_data to the header, and not the other way. This patch comes close to that ideal, but the directio code currently needs some special casing, isolated in the nfs_direct_[read_write]hdr_release() functions. This will be dealt with in a future patch. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
-rw-r--r--fs/nfs/internal.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 650127f..7dc9be1 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -296,6 +296,8 @@ extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
struct nfs_pageio_descriptor;
/* read.c */
+extern struct nfs_read_header *nfs_readhdr_alloc(unsigned int npages);
+extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
extern int nfs_initiate_read(struct rpc_clnt *clnt,
struct nfs_read_data *data,
const struct rpc_call_ops *call_ops);
@@ -309,6 +311,8 @@ extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
extern void nfs_readdata_release(struct nfs_read_data *rdata);
/* write.c */
+extern struct nfs_write_header *nfs_writehdr_alloc(unsigned int npages);
+extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
struct list_head *head);
extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
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