libceph: Unlock unprocessed pages in start_read() error path
Function start_read() can get an error before processing all pages. It must not only release the remaining pages, but unlock them too. This fixes http://tracker.newdream.net/issues/3370 Signed-off-by: David Zafman <david.zafman@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com>
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@ -267,6 +267,14 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
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kfree(req->r_pages);
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}
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static void ceph_unlock_page_vector(struct page **pages, int num_pages)
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{
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int i;
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for (i = 0; i < num_pages; i++)
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unlock_page(pages[i]);
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}
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/*
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* start an async read(ahead) operation. return nr_pages we submitted
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* a read for on success, or negative error code.
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@ -347,6 +355,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
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return nr_pages;
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out_pages:
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ceph_unlock_page_vector(pages, nr_pages);
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ceph_release_page_vector(pages, nr_pages);
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out:
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ceph_osdc_put_request(req);
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