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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-02-03 08:27:22 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-02-23 07:37:51 -0800
commit04673da74dbd331040fa439bd72963a35f1b67cf (patch)
tree9c04a2a2769d4f99dff83b9e1802bd54da147e69 /fs/nfs
parente7055c2366a5a5b507492905200d4327949b81ce (diff)
NFS: Fix an Oops when truncating a file
commit 9f557cd8073104b39528794d44e129331ded649f 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>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/pagelist.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index e2975939126a..a12c45b65dd4 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -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);
}
/**