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NFS: create common nfs_pgio_header for both read and write

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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>
This commit is contained in:
Fred Isaman 2012-04-20 14:47:44 -04:00 • committed by Trond Myklebust
parent b554284976
commit cd841605f7
14 changed files with 376 additions and 278 deletions
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19
fs/nfs/objlayout/objlayout.c
View file

@ -258,7 +258,7 @@ objlayout_read_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
if (status >= 0)
rdata->res.count = status;
else
rdata->pnfs_error = status;
rdata->header->pnfs_error = status;
objlayout_iodone(oir);
/* must not use oir after this point */
@ -279,12 +279,14 @@ objlayout_read_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
enum pnfs_try_status
objlayout_read_pagelist(struct nfs_read_data *rdata)
{
struct nfs_pgio_header *hdr = rdata->header;
struct inode *inode = hdr->inode;
loff_t offset = rdata->args.offset;
size_t count = rdata->args.count;
int err;
loff_t eof;
eof = i_size_read(rdata->inode);
eof = i_size_read(inode);
if (unlikely(offset + count > eof)) {
if (offset >= eof) {
err = 0;
@ -297,17 +299,17 @@ objlayout_read_pagelist(struct nfs_read_data *rdata)
}
rdata->res.eof = (offset + count) >= eof;
_fix_verify_io_params(rdata->lseg, &rdata->args.pages,
_fix_verify_io_params(hdr->lseg, &rdata->args.pages,
&rdata->args.pgbase,
rdata->args.offset, rdata->args.count);
dprintk("%s: inode(%lx) offset 0x%llx count 0x%Zx eof=%d\n",
__func__, rdata->inode->i_ino, offset, count, rdata->res.eof);
__func__, inode->i_ino, offset, count, rdata->res.eof);
err = objio_read_pagelist(rdata);
out:
if (unlikely(err)) {
rdata->pnfs_error = err;
hdr->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}
@ -340,7 +342,7 @@ objlayout_write_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
wdata->res.count = status;
wdata->verf.committed = oir->committed;
} else {
wdata->pnfs_error = status;
wdata->header->pnfs_error = status;
}
objlayout_iodone(oir);
/* must not use oir after this point */
@ -363,15 +365,16 @@ enum pnfs_try_status
objlayout_write_pagelist(struct nfs_write_data *wdata,
int how)
{
struct nfs_pgio_header *hdr = wdata->header;
int err;
_fix_verify_io_params(wdata->lseg, &wdata->args.pages,
_fix_verify_io_params(hdr->lseg, &wdata->args.pages,
&wdata->args.pgbase,
wdata->args.offset, wdata->args.count);
err = objio_write_pagelist(wdata, how);
if (unlikely(err)) {
wdata->pnfs_error = err;
hdr->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}