【openEuler-1.0-LTS】4.19 LTS补丁回合：cifs: Release folio lock on fscache read hit

5a87735675147	cifs: Release folio lock on fscache read hit.

~~~c
 static int cifs_readpage_worker(struct file *file, struct page *page,
        loff_t *poffset)
 {
        char *read_data;
        int rc;
 
        /* Is the page cached? */
        rc = cifs_readpage_from_fscache(file_inode(file), page);
        if (rc == 0)
                goto read_complete;    // 如果 FSCACHE 命中，goto read_complete
 
        read_data = kmap(page);
        /* for reads over a certain size could initiate async read ahead */
 
        rc = cifs_read(file, read_data, PAGE_SIZE, poffset);
 
        if (rc < 0)
                goto io_error;
        else
                cifs_dbg(FYI, "Bytes read %d\n", rc);
 
        file_inode(file)->i_atime =
                current_time(file_inode(file));
 
        if (PAGE_SIZE > rc)
                memset(read_data + rc, 0, PAGE_SIZE - rc);
 
        flush_dcache_page(page);
        SetPageUptodate(page);
 
        /* send this page to the cache */
        cifs_readpage_to_fscache(file_inode(file), page);
 
        rc = 0;
 
 io_error:
        kunmap(page);
        unlock_page(page);
 
 read_complete:
        return rc; // 漏掉了unlock_page(page)锁
 }

~~~

GVP openEuler/kernel
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GVPopenEuler/kernelClosed

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