From 0f9c429eca07aca2764ccd751e2b48ba5397b936 Mon Sep 17 00:00:00 2001 From: Weston Andros Adamson Date: Thu, 15 May 2014 11:56:51 -0400 Subject: [PATCH] nfs: chain calls to pg_test Now that pg_test can change the size of the request (by returning a non-zero size smaller than the request), pg_test functions that call other pg_test functions must return the minimum of the result - or 0 if any fail. Also clean up the logic of some pg_test functions so that all checks are for contitions where coalescing is not possible. Signed-off-by: Weston Andros Adamson Signed-off-by: Trond Myklebust --- fs/nfs/nfs4filelayout.c | 27 ++++++++++++++------------- fs/nfs/objlayout/objio_osd.c | 9 ++++++--- fs/nfs/pnfs.c | 15 ++++++++++----- 3 files changed, 30 insertions(+), 21 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 9cea9358fe52..7a665e0f35b7 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -928,26 +928,27 @@ static size_t filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req) { + unsigned int size; u64 p_stripe, r_stripe; u32 stripe_unit; - if (!pnfs_generic_pg_test(pgio, prev, req) || - !nfs_generic_pg_test(pgio, prev, req)) + /* calls nfs_generic_pg_test */ + size = pnfs_generic_pg_test(pgio, prev, req); + if (!size) return 0; - if (!prev) - return req->wb_bytes; + if (prev) { + p_stripe = (u64)req_offset(prev); + r_stripe = (u64)req_offset(req); + stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; - p_stripe = (u64)req_offset(prev); - r_stripe = (u64)req_offset(req); - stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; + do_div(p_stripe, stripe_unit); + do_div(r_stripe, stripe_unit); - do_div(p_stripe, stripe_unit); - do_div(r_stripe, stripe_unit); - - if (p_stripe == r_stripe) - return req->wb_bytes; - return 0; + if (p_stripe != r_stripe) + return 0; + } + return min(size, req->wb_bytes); } static void diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c index 71b9c69dbe9c..611320753db2 100644 --- a/fs/nfs/objlayout/objio_osd.c +++ b/fs/nfs/objlayout/objio_osd.c @@ -571,12 +571,15 @@ int objio_write_pagelist(struct nfs_pgio_data *wdata, int how) static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req) { - if (!pnfs_generic_pg_test(pgio, prev, req) || - pgio->pg_count + req->wb_bytes > + unsigned int size; + + size = pnfs_generic_pg_test(pgio, prev, req); + + if (!size || pgio->pg_count + req->wb_bytes > (unsigned long)pgio->pg_layout_private) return 0; - return req->wb_bytes; + return min(size, req->wb_bytes); } static void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index de6eb16f94d1..354c53cd4095 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1442,8 +1442,12 @@ size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req) { - if (pgio->pg_lseg == NULL) - return nfs_generic_pg_test(pgio, prev, req); + unsigned int size; + + size = nfs_generic_pg_test(pgio, prev, req); + + if (!size) + return 0; /* * Test if a nfs_page is fully contained in the pnfs_layout_range. @@ -1459,10 +1463,11 @@ pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, * first byte that lies outside the pnfs_layout_range. FIXME? * */ - if (req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset, + if (req_offset(req) >= end_offset(pgio->pg_lseg->pls_range.offset, pgio->pg_lseg->pls_range.length)) - return req->wb_bytes; - return 0; + return 0; + + return min(size, req->wb_bytes); } EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); -- 2.34.1