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authorBoaz Harrosh <bharrosh@panasas.com>2011-05-29 12:45:39 +0400
committerBoaz Harrosh <bharrosh@panasas.com>2011-05-29 22:02:42 +0400
commit5b36c7dc41d87d39e779a84fdc2b44b39bba32ca (patch)
tree4b83c833021014fd51fcffbff88eea8069cd9cff /fs/nfs/pagelist.c
parent89a58e32d9105c01022a757fb32ddc3b51bf0025 (diff)
downloadlinux-5b36c7dc41d87d39e779a84fdc2b44b39bba32ca.tar.xz
NFSv4.1: define nfs_generic_pg_test
By default, unless pnfs is used coalesce pages until pg_bsize (rsize or wsize) is reached. pnfs layout drivers define their own pg_test methods that use pnfs_generic_pg_test and need to define their own I/O size limits (e.g. based on the file stripe size). [Move a check from nfs_pageio_do_add_request to nfs_generic_pg_test] Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Diffstat (limited to 'fs/nfs/pagelist.c')
-rw-r--r--fs/nfs/pagelist.c44
1 files changed, 20 insertions, 24 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 5344371a257c..7913961aff22 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -204,6 +204,21 @@ nfs_wait_on_request(struct nfs_page *req)
TASK_UNINTERRUPTIBLE);
}
+static bool nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, struct nfs_page *prev, struct nfs_page *req)
+{
+ /*
+ * FIXME: ideally we should be able to coalesce all requests
+ * that are not block boundary aligned, but currently this
+ * is problematic for the case of bsize < PAGE_CACHE_SIZE,
+ * since nfs_flush_multi and nfs_pagein_multi assume you
+ * can have only one struct nfs_page.
+ */
+ if (desc->pg_bsize < PAGE_SIZE)
+ return 0;
+
+ return desc->pg_count + req->wb_bytes <= desc->pg_bsize;
+}
+
/**
* nfs_pageio_init - initialise a page io descriptor
* @desc: pointer to descriptor
@@ -229,7 +244,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
desc->pg_ioflags = io_flags;
desc->pg_error = 0;
desc->pg_lseg = NULL;
- desc->pg_test = NULL;
+ desc->pg_test = nfs_generic_pg_test;
pnfs_pageio_init(desc, inode);
}
@@ -260,13 +275,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
return false;
if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
return false;
- /*
- * Non-whole file layouts need to check that req is inside of
- * pgio->pg_lseg.
- */
- if (pgio->pg_test && !pgio->pg_test(pgio, prev, req))
- return false;
- return true;
+ return pgio->pg_test(pgio, prev, req);
}
/**
@@ -280,31 +289,18 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
- size_t newlen = req->wb_bytes;
-
if (desc->pg_count != 0) {
struct nfs_page *prev;
- /*
- * FIXME: ideally we should be able to coalesce all requests
- * that are not block boundary aligned, but currently this
- * is problematic for the case of bsize < PAGE_CACHE_SIZE,
- * since nfs_flush_multi and nfs_pagein_multi assume you
- * can have only one struct nfs_page.
- */
- if (desc->pg_bsize < PAGE_SIZE)
- return 0;
- newlen += desc->pg_count;
- if (newlen > desc->pg_bsize)
- return 0;
prev = nfs_list_entry(desc->pg_list.prev);
if (!nfs_can_coalesce_requests(prev, req, desc))
return 0;
- } else
+ } else {
desc->pg_base = req->wb_pgbase;
+ }
nfs_list_remove_request(req);
nfs_list_add_request(req, &desc->pg_list);
- desc->pg_count = newlen;
+ desc->pg_count += req->wb_bytes;
return 1;
}