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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-02-03 08:27:22 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-02-03 08:27:22 -0500
commit9f557cd8073104b39528794d44e129331ded649f (patch)
tree104a4146a767f3e42b474cdbbf056130b35d22b1 /fs
parenta2c0b9e291208f65221a0ad8a0c80a377707d480 (diff)
NFS: Fix an Oops when truncating a file
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> Cc: stable@kernel.org
Diffstat (limited to 'fs')
-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 e2975939126..a12c45b65dd 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);
}
/**