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| author |   Fred Isaman <iisaman@netapp.com> | 2012-04-20 14:47:44 -0400 |
|---|---|---|
| committer |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-04-27 14:10:37 -0400 |
| commit | cd841605f7a721878d8a2d1362484723d8abf569 (patch) | |
| tree | b5c37db575cd545a183577249909e042fe38d646 /fs/nfs/internal.h | |
| parent | NFS: use req_offset where appropriate (diff) | |
| download | linux-dev-cd841605f7a721878d8a2d1362484723d8abf569.tar.xz linux-dev-cd841605f7a721878d8a2d1362484723d8abf569.zip | |
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.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 650127fd24bb..7dc9be1a6e1a 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, |