From 275acaafd45fbc8ecc3beabd6367e60b3049606a Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 12 Jul 2011 13:42:02 -0400 Subject: 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 --- fs/nfs/read.c | 92 +++++++++++++++++++++++++++++++-------------------------- fs/nfs/write.c | 93 ++++++++++++++++++++++++++++++++-------------------------- 2 files changed, 102 insertions(+), 83 deletions(-) (limited to 'fs') diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 581534a4aed7..0215bac35fc6 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); diff --git a/fs/nfs/write.c b/fs/nfs/write.c index d9dd744588d4..bd4b34e5870b 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -903,6 +903,27 @@ static int nfs_do_write(struct nfs_write_data *data, return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how); } +static int nfs_do_multiple_writes(struct list_head *head, + const struct rpc_call_ops *call_ops, + struct pnfs_layout_segment *lseg, + int how) +{ + struct nfs_write_data *data; + int ret = 0; + + while (!list_empty(head)) { + int ret2; + + data = list_entry(head->next, struct nfs_write_data, list); + list_del_init(&data->list); + + ret2 = nfs_do_write(data, call_ops, lseg, how); + if (ret == 0) + ret = ret2; + } + return ret; +} + /* If a nfs_flush_* function fails, it should remove reqs from @head and * call this on each, which will prepare them to be retried on next * writeback using standard nfs. @@ -920,7 +941,7 @@ static void nfs_redirty_request(struct nfs_page *req) * Generate multiple small requests to write out a single * contiguous dirty area on one page. */ -static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) +static int nfs_flush_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; @@ -929,8 +950,6 @@ static int nfs_flush_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); @@ -940,6 +959,7 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) desc->pg_ioflags &= ~FLUSH_COND_STABLE; + offset = 0; nbytes = desc->pg_count; do { size_t len = min(nbytes, wsize); @@ -947,47 +967,23 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc) data = nfs_writedata_alloc(1); if (!data) goto out_bad; - list_add(&data->list, &list); + data->pagevec[0] = page; + nfs_write_rpcsetup(req, data, wsize, offset, desc->pg_ioflags); + 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_write_data, list); - list_del_init(&data->list); - - data->pagevec[0] = page; - - if (nbytes < wsize) - wsize = nbytes; - nfs_write_rpcsetup(req, data, wsize, offset, desc->pg_ioflags); - ret2 = nfs_do_write(data, &nfs_write_partial_ops, lseg, - desc->pg_ioflags); - if (ret == 0) - ret = ret2; - offset += wsize; - nbytes -= wsize; - } 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_write_data, list); + while (!list_empty(res)) { + data = list_entry(res->next, struct nfs_write_data, list); list_del(&data->list); nfs_writedata_free(data); } nfs_redirty_request(req); - put_lseg(lseg); - desc->pg_lseg = NULL; return -ENOMEM; } @@ -999,13 +995,12 @@ out_bad: * This is the case if nfs_updatepage detects a conflicting request * that has been written but not committed. */ -static int nfs_flush_one(struct nfs_pageio_descriptor *desc) +static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *res) { struct nfs_page *req; struct page **pages; struct nfs_write_data *data; struct list_head *head = &desc->pg_list; - struct pnfs_layout_segment *lseg = desc->pg_lseg; int ret = 0; data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base, @@ -1035,18 +1030,34 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc) /* Set up the argument struct */ nfs_write_rpcsetup(req, data, desc->pg_count, 0, desc->pg_ioflags); - ret = nfs_do_write(data, &nfs_write_full_ops, lseg, desc->pg_ioflags); + list_add(&data->list, res); out: - put_lseg(lseg); /* Cleans any gotten in ->pg_test */ - desc->pg_lseg = NULL; return ret; } int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) { - if (desc->pg_bsize < PAGE_CACHE_SIZE) - return nfs_flush_multi(desc); - return nfs_flush_one(desc); + LIST_HEAD(head); + int ret; + + if (desc->pg_bsize < PAGE_CACHE_SIZE) { + ret = nfs_flush_multi(desc, &head); + if (ret == 0) + ret = nfs_do_multiple_writes(&head, + &nfs_write_partial_ops, + desc->pg_lseg, + desc->pg_ioflags); + } else { + ret = nfs_flush_one(desc, &head); + if (ret == 0) + ret = nfs_do_multiple_writes(&head, + &nfs_write_full_ops, + desc->pg_lseg, + desc->pg_ioflags); + } + put_lseg(desc->pg_lseg); + desc->pg_lseg = NULL; + return ret; } EXPORT_SYMBOL_GPL(nfs_generic_pg_writepages); -- cgit v1.2.3