diff options
author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-07-12 13:42:02 -0400 |
---|---|---|
committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-07-15 09:12:17 -0400 |
commit | 275acaafd45fbc8ecc3beabd6367e60b3049606a (patch) | |
tree | 7da9d9a606c274742d41860cb429c7d25a917f1d /fs/nfs/read.c | |
parent | 3b6091846d5b6113d695c79caec7cc96b62d469b (diff) |
NFS: Clean up: split out the RPC transmission from nfs_pagein_multi/one
...and do the same for nfs_flush_multi/one.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r-- | fs/nfs/read.c | 92 |
1 files changed, 50 insertions, 42 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 581534a4aed..0215bac35fc 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -30,8 +30,6 @@ #define NFSDBG_FACILITY NFSDBG_PAGECACHE -static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc); -static int nfs_pagein_one(struct nfs_pageio_descriptor *desc); static const struct nfs_pageio_ops nfs_pageio_read_ops; static const struct rpc_call_ops nfs_read_partial_ops; static const struct rpc_call_ops nfs_read_full_ops; @@ -253,6 +251,27 @@ static int nfs_do_read(struct nfs_read_data *data, return nfs_initiate_read(data, NFS_CLIENT(inode), call_ops); } +static int +nfs_do_multiple_reads(struct list_head *head, + const struct rpc_call_ops *call_ops, + struct pnfs_layout_segment *lseg) +{ + struct nfs_read_data *data; + int ret = 0; + + while (!list_empty(head)) { + int ret2; + + data = list_entry(head->next, struct nfs_read_data, list); + list_del_init(&data->list); + + ret2 = nfs_do_read(data, call_ops, lseg); + if (ret == 0) + ret = ret2; + } + return ret; +} + static void nfs_async_read_error(struct list_head *head) { @@ -279,7 +298,7 @@ nfs_async_read_error(struct list_head *head) * won't see the new data until our attribute cache is updated. This is more * or less conventional NFS client behavior. */ -static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc) +static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc, struct list_head *res) { struct nfs_page *req = nfs_list_entry(desc->pg_list.next); struct page *page = req->wb_page; @@ -288,11 +307,10 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc) unsigned int offset; int requests = 0; int ret = 0; - struct pnfs_layout_segment *lseg = desc->pg_lseg; - LIST_HEAD(list); nfs_list_remove_request(req); + offset = 0; nbytes = desc->pg_count; do { size_t len = min(nbytes,rsize); @@ -300,57 +318,33 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc) data = nfs_readdata_alloc(1); if (!data) goto out_bad; - list_add(&data->list, &list); + data->pagevec[0] = page; + nfs_read_rpcsetup(req, data, len, offset); + list_add(&data->list, res); requests++; nbytes -= len; + offset += len; } while(nbytes != 0); atomic_set(&req->wb_complete, requests); - ClearPageError(page); - offset = 0; - nbytes = desc->pg_count; - do { - int ret2; - - data = list_entry(list.next, struct nfs_read_data, list); - list_del_init(&data->list); - - data->pagevec[0] = page; - - if (nbytes < rsize) - rsize = nbytes; - nfs_read_rpcsetup(req, data, rsize, offset); - ret2 = nfs_do_read(data, &nfs_read_partial_ops, lseg); - if (ret == 0) - ret = ret2; - offset += rsize; - nbytes -= rsize; - } while (nbytes != 0); - put_lseg(lseg); - desc->pg_lseg = NULL; - return ret; - out_bad: - while (!list_empty(&list)) { - data = list_entry(list.next, struct nfs_read_data, list); + while (!list_empty(res)) { + data = list_entry(res->next, struct nfs_read_data, list); list_del(&data->list); nfs_readdata_free(data); } SetPageError(page); nfs_readpage_release(req); - put_lseg(lseg); - desc->pg_lseg = NULL; return -ENOMEM; } -static int nfs_pagein_one(struct nfs_pageio_descriptor *desc) +static int nfs_pagein_one(struct nfs_pageio_descriptor *desc, struct list_head *res) { struct nfs_page *req; struct page **pages; struct nfs_read_data *data; struct list_head *head = &desc->pg_list; - struct pnfs_layout_segment *lseg = desc->pg_lseg; int ret = 0; data = nfs_readdata_alloc(nfs_page_array_len(desc->pg_base, @@ -372,18 +366,32 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc) req = nfs_list_entry(data->pages.next); nfs_read_rpcsetup(req, data, desc->pg_count, 0); - ret = nfs_do_read(data, &nfs_read_full_ops, lseg); + list_add(&data->list, res); out: - put_lseg(lseg); - desc->pg_lseg = NULL; return ret; } int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) { - if (desc->pg_bsize < PAGE_CACHE_SIZE) - return nfs_pagein_multi(desc); - return nfs_pagein_one(desc); + LIST_HEAD(head); + int ret; + + if (desc->pg_bsize < PAGE_CACHE_SIZE) { + ret = nfs_pagein_multi(desc, &head); + if (ret == 0) + ret = nfs_do_multiple_reads(&head, + &nfs_read_partial_ops, + desc->pg_lseg); + } else { + ret = nfs_pagein_one(desc, &head); + if (ret == 0) + ret = nfs_do_multiple_reads(&head, + &nfs_read_full_ops, + desc->pg_lseg); + } + put_lseg(desc->pg_lseg); + desc->pg_lseg = NULL; + return ret; } EXPORT_SYMBOL_GPL(nfs_generic_pg_readpages); |