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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-12-15 17:12:14 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-12-15 17:12:14 -0500
commitada8e20d044c0fa5610e504ce6fb4578ebd3edd9 (patch)
tree262c1f77aa99dcd23e1d4e08f9468b712a837591 /fs/nfs
parent1efc28780bf84f04dcce4f3f7242e4e6a59bffd4 (diff)
NFS: Don't use SetPageError in the NFS writeback code
The writeback code is already capable of passing errors back to user space by means of the open_context->error. In the case of ENOSPC, Neil Brown is reporting seeing 2 errors being returned. Neil writes: "e.g. if /mnt2/ if an nfs mounted filesystem that has no space then strace dd if=/dev/zero conv=fsync >> /mnt2/afile count=1 reported Input/output error and the relevant parts of the strace output are: write(1, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 fsync(1) = -1 EIO (Input/output error) close(1) = -1 ENOSPC (No space left on device)" Neil then shows that the duplication of error messages appears to be due to the use of the PageError() mechanism, which causes filemap_fdatawait_range to return the extra EIO. The regression was introduced by commit 7b281ee026552f10862b617a2a51acf49c829554 (NFS: fsync() must exit with an error if page writeback failed). Fix this by removing the call to SetPageError(), and just relying on open_context->error reporting the ENOSPC back to fsync(). Reported-by: Neil Brown <neilb@suse.de> Tested-by: Neil Brown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org [3.6+]
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/write.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f608ca606b2..5209916e122 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -202,7 +202,6 @@ out:
/* A writeback failed: mark the page as bad, and invalidate the page cache */
static void nfs_set_pageerror(struct page *page)
{
- SetPageError(page);
nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
}