diff options
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r-- | fs/nfs/read.c | 166 |
1 files changed, 94 insertions, 72 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c index a68679f..2171c04 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -30,8 +30,7 @@ #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; @@ -68,7 +67,7 @@ void nfs_readdata_free(struct nfs_read_data *p) mempool_free(p, nfs_rdata_mempool); } -static void nfs_readdata_release(struct nfs_read_data *rdata) +void nfs_readdata_release(struct nfs_read_data *rdata) { put_lseg(rdata->lseg); put_nfs_open_context(rdata->args.context); @@ -113,6 +112,27 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data) } } +static void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio, + struct inode *inode) +{ + nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops, + NFS_SERVER(inode)->rsize, 0); +} + +void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio) +{ + pgio->pg_ops = &nfs_pageio_read_ops; + pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->rsize; +} +EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds); + +static void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, + struct inode *inode) +{ + if (!pnfs_pageio_init_read(pgio, inode)) + nfs_pageio_init_read_mds(pgio, inode); +} + int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode, struct page *page) { @@ -131,14 +151,9 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode, if (len < PAGE_CACHE_SIZE) zero_user_segment(page, len, PAGE_CACHE_SIZE); - nfs_pageio_init(&pgio, inode, NULL, 0, 0); - nfs_list_add_request(new, &pgio.pg_list); - pgio.pg_count = len; - - if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE) - nfs_pagein_multi(&pgio); - else - nfs_pagein_one(&pgio); + nfs_pageio_init_read(&pgio, inode); + nfs_pageio_add_request(&pgio, new); + nfs_pageio_complete(&pgio); return 0; } @@ -202,17 +217,14 @@ EXPORT_SYMBOL_GPL(nfs_initiate_read); /* * Set up the NFS read request struct */ -static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, - const struct rpc_call_ops *call_ops, - unsigned int count, unsigned int offset, - struct pnfs_layout_segment *lseg) +static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, + unsigned int count, unsigned int offset) { struct inode *inode = req->wb_context->dentry->d_inode; data->req = req; data->inode = inode; data->cred = req->wb_context->cred; - data->lseg = get_lseg(lseg); data->args.fh = NFS_FH(inode); data->args.offset = req_offset(req) + offset; @@ -226,14 +238,36 @@ static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, data->res.count = count; data->res.eof = 0; nfs_fattr_init(&data->fattr); +} - if (data->lseg && - (pnfs_try_to_read_data(data, call_ops) == PNFS_ATTEMPTED)) - return 0; +static int nfs_do_read(struct nfs_read_data *data, + const struct rpc_call_ops *call_ops) +{ + struct inode *inode = data->args.context->dentry->d_inode; 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 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); + if (ret == 0) + ret = ret2; + } + return ret; +} + static void nfs_async_read_error(struct list_head *head) { @@ -260,20 +294,19 @@ 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; struct nfs_read_data *data; - size_t rsize = NFS_SERVER(desc->pg_inode)->rsize, nbytes; + size_t rsize = desc->pg_bsize, nbytes; unsigned int offset; int requests = 0; int ret = 0; - struct pnfs_layout_segment *lseg; - LIST_HEAD(list); nfs_list_remove_request(req); + offset = 0; nbytes = desc->pg_count; do { size_t len = min(nbytes,rsize); @@ -281,45 +314,21 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc) data = nfs_readdata_alloc(1); if (!data) goto out_bad; - list_add(&data->pages, &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); - - BUG_ON(desc->pg_lseg != NULL); - lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, - req_offset(req), desc->pg_count, - IOMODE_READ, GFP_KERNEL); ClearPageError(page); - offset = 0; - nbytes = desc->pg_count; - do { - int ret2; - - data = list_entry(list.next, struct nfs_read_data, pages); - list_del_init(&data->pages); - - data->pagevec[0] = page; - - if (nbytes < rsize) - rsize = nbytes; - ret2 = nfs_read_rpcsetup(req, data, &nfs_read_partial_ops, - rsize, offset, lseg); - if (ret == 0) - ret = ret2; - offset += rsize; - nbytes -= rsize; - } while (nbytes != 0); - put_lseg(lseg); - desc->pg_lseg = NULL; - + desc->pg_rpc_callops = &nfs_read_partial_ops; return ret; - out_bad: - while (!list_empty(&list)) { - data = list_entry(list.next, struct nfs_read_data, pages); - list_del(&data->pages); + while (!list_empty(res)) { + data = list_entry(res->next, struct nfs_read_data, list); + list_del(&data->list); nfs_readdata_free(data); } SetPageError(page); @@ -327,19 +336,19 @@ out_bad: 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 = -ENOMEM; + int ret = 0; data = nfs_readdata_alloc(nfs_page_array_len(desc->pg_base, desc->pg_count)); if (!data) { nfs_async_read_error(head); + ret = -ENOMEM; goto out; } @@ -352,19 +361,37 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc) *pages++ = req->wb_page; } req = nfs_list_entry(data->pages.next); - if ((!lseg) && list_is_singular(&data->pages)) - lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, - req_offset(req), desc->pg_count, - IOMODE_READ, GFP_KERNEL); - ret = nfs_read_rpcsetup(req, data, &nfs_read_full_ops, desc->pg_count, - 0, lseg); + nfs_read_rpcsetup(req, data, desc->pg_count, 0); + list_add(&data->list, res); + desc->pg_rpc_callops = &nfs_read_full_ops; out: - put_lseg(lseg); - desc->pg_lseg = NULL; return ret; } +int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, struct list_head *head) +{ + if (desc->pg_bsize < PAGE_CACHE_SIZE) + return nfs_pagein_multi(desc, head); + return nfs_pagein_one(desc, head); +} + +static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) +{ + LIST_HEAD(head); + int ret; + + ret = nfs_generic_pagein(desc, &head); + if (ret == 0) + ret = nfs_do_multiple_reads(&head, desc->pg_rpc_callops); + return ret; +} + +static const struct nfs_pageio_ops nfs_pageio_read_ops = { + .pg_test = nfs_generic_pg_test, + .pg_doio = nfs_generic_pg_readpages, +}; + /* * This is the callback from RPC telling us whether a reply was * received or some error occurred (timeout or socket shutdown). @@ -635,8 +662,6 @@ int nfs_readpages(struct file *filp, struct address_space *mapping, .pgio = &pgio, }; struct inode *inode = mapping->host; - struct nfs_server *server = NFS_SERVER(inode); - size_t rsize = server->rsize; unsigned long npages; int ret = -ESTALE; @@ -664,10 +689,7 @@ int nfs_readpages(struct file *filp, struct address_space *mapping, if (ret == 0) goto read_complete; /* all pages were read */ - if (rsize < PAGE_CACHE_SIZE) - nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0); - else - nfs_pageio_init(&pgio, inode, nfs_pagein_one, rsize, 0); + nfs_pageio_init_read(&pgio, inode); ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc); |