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pNFS: Fix potential corruption of page being written
nfs_want_read_modify_write() didn't check for !PagePrivate when pNFS block or SCSI layout was in use, therefore we could lose data forever if the page being written was filled by a read before completion. Signed-off-by: Kazuo Ito <ito_kazuo_g3@lab.ntt.co.jp> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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@ -299,7 +299,7 @@ static int nfs_want_read_modify_write(struct file *file, struct page *page,
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unsigned int end = offset + len;
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if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
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if (!PageUptodate(page))
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if (!PageUptodate(page) && !PagePrivate(page))
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return 1;
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return 0;
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}
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