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libceph: Unlock unprocessed pages in start_read() error path

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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>
(cherry picked from commit 8884d53dd6)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Zafman 2012-12-03 19:14:05 -08:00 committed by Greg Kroah-Hartman
parent 57d93df8f1
commit 359c4ea7ba
1 changed files with 9 additions and 0 deletions
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9
fs/ceph/addr.c
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@ -267,6 +267,14 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
kfree(req->r_pages);
}
static void ceph_unlock_page_vector(struct page **pages, int num_pages)
{
int i;
for (i = 0; i < num_pages; i++)
unlock_page(pages[i]);
}
/*
* start an async read(ahead) operation. return nr_pages we submitted
* a read for on success, or negative error code.
@ -347,6 +355,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
return nr_pages;
out_pages:
ceph_unlock_page_vector(pages, nr_pages);
ceph_release_page_vector(pages, nr_pages);
out:
ceph_osdc_put_request(req);