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NFS: Fix an Oops when truncating a file

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commit 9f557cd807 upstream.

The VM/VFS does not allow mapping->a_ops->invalidatepage() to fail.
Unfortunately, nfs_wb_page_cancel() may fail if a fatal signal occurs.
Since the NFS code assumes that the page stays mapped for as long as the
writeback is active, we can end up Oopsing (among other things).

The only safe fix here is to convert nfs_wait_on_request(), so as to make
it uninterruptible (as is already the case with wait_on_page_writeback()).


Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Trond Myklebust
2010-02-03 08:27:22 -05:00
committed by Greg Kroah-Hartman
parent e7055c2366
commit 04673da74d
1 changed files with 9 additions and 8 deletions
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17
fs/nfs/pagelist.c
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@@ -176,6 +176,12 @@ void nfs_release_request(struct nfs_page *req)
kref_put(&req->wb_kref, nfs_free_request);
}
static int nfs_wait_bit_uninterruptible(void *word)
{
io_schedule();
return 0;
}
/**
* nfs_wait_on_request - Wait for a request to complete.
* @req: request to wait upon.
@@ -186,14 +192,9 @@ void nfs_release_request(struct nfs_page *req)
int
nfs_wait_on_request(struct nfs_page *req)
{
int ret = 0;
if (!test_bit(PG_BUSY, &req->wb_flags))
goto out;
ret = out_of_line_wait_on_bit(&req->wb_flags, PG_BUSY,
nfs_wait_bit_killable, TASK_KILLABLE);
out:
return ret;
return wait_on_bit(&req->wb_flags, PG_BUSY,
nfs_wait_bit_uninterruptible,
TASK_UNINTERRUPTIBLE);
}
/**