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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-08-22 13:44:32 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-08-24 15:51:08 -0400
commit79558f3610efd7928e8882b2eaca3093b283630e (patch)
tree125f16640cd7f9de2074dae89a9c6c405703029c /fs/nfs/read.c
parent01df9c5e918ae5559f2d96da0143f8bfbb9e6171 (diff)
downloadop-kernel-dev-79558f3610efd7928e8882b2eaca3093b283630e.zip
op-kernel-dev-79558f3610efd7928e8882b2eaca3093b283630e.tar.gz
NFS: Fix issue with EIO on NFS read
The problem is that we may be caching writes that would extend the file and create a hole in the region that we are reading. In this case, we need to detect the eof from the server, ensure that we zero out the pages that are part of the hole and mark them as up to date. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> (cherry picked from 856b603b01b99146918c093969b6cb1b1b0f1c01 commit)
Diffstat (limited to 'fs/nfs/read.c')
-rw-r--r--fs/nfs/read.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 65c0c5b..da9cf11 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -116,10 +116,17 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data)
pages = &data->args.pages[base >> PAGE_CACHE_SHIFT];
base &= ~PAGE_CACHE_MASK;
pglen = PAGE_CACHE_SIZE - base;
- if (pglen < remainder)
+ for (;;) {
+ if (remainder <= pglen) {
+ memclear_highpage_flush(*pages, base, remainder);
+ break;
+ }
memclear_highpage_flush(*pages, base, pglen);
- else
- memclear_highpage_flush(*pages, base, remainder);
+ pages++;
+ remainder -= pglen;
+ pglen = PAGE_CACHE_SIZE;
+ base = 0;
+ }
}
/*
@@ -476,6 +483,8 @@ static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data)
unsigned int base = data->args.pgbase;
struct page **pages;
+ if (data->res.eof)
+ count = data->args.count;
if (unlikely(count == 0))
return;
pages = &data->args.pages[base >> PAGE_CACHE_SHIFT];
@@ -483,11 +492,7 @@ static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data)
count += base;
for (;count >= PAGE_CACHE_SIZE; count -= PAGE_CACHE_SIZE, pages++)
SetPageUptodate(*pages);
- /*
- * Was this an eof or a short read? If the latter, don't mark the page
- * as uptodate yet.
- */
- if (count > 0 && (data->res.eof || data->args.count == data->res.count))
+ if (count != 0)
SetPageUptodate(*pages);
}
@@ -502,6 +507,8 @@ static void nfs_readpage_set_pages_error(struct nfs_read_data *data)
count += base;
for (;count >= PAGE_CACHE_SIZE; count -= PAGE_CACHE_SIZE, pages++)
SetPageError(*pages);
+ if (count != 0)
+ SetPageError(*pages);
}
/*
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