ceph: handle -EAGAIN returned by ceph_update_writeable_page()
when ceph_update_writeable_page() return -EAGAIN, caller should lock the page and call ceph_update_writeable_page() again. Signed-off-by: Yan, Zheng <zyan@redhat.com>
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@ -1475,21 +1475,23 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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/* Update time before taking page lock */
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file_update_time(vma->vm_file);
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lock_page(page);
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do {
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lock_page(page);
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if ((off > size) || (page->mapping != inode->i_mapping)) {
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unlock_page(page);
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ret = VM_FAULT_NOPAGE;
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goto out;
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}
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if ((off > size) || (page->mapping != inode->i_mapping)) {
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unlock_page(page);
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ret = VM_FAULT_NOPAGE;
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break;
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}
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ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
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if (ret >= 0) {
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/* success. we'll keep the page locked. */
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set_page_dirty(page);
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ret = VM_FAULT_LOCKED;
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}
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} while (ret == -EAGAIN);
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ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
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if (ret >= 0) {
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/* success. we'll keep the page locked. */
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set_page_dirty(page);
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ret = VM_FAULT_LOCKED;
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}
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out:
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if (ret == VM_FAULT_LOCKED ||
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ci->i_inline_version != CEPH_INLINE_NONE) {
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int dirty;
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