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Viewing changes to mm/readahead.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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Lines of Context:
mm/readahead.c
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static int read_pages(struct address_space *mapping, struct file *filp,
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                struct list_head *pages, unsigned nr_pages)
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{
 
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        struct blk_plug plug;
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        unsigned page_idx;
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        int ret;
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        blk_start_plug(&plug);
 
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        if (mapping->a_ops->readpages) {
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                ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
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                /* Clean up the remaining pages */
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                page_cache_release(page);
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        }
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        ret = 0;
 
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out:
 
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        blk_finish_plug(&plug);
 
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        return ret;
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}
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                if (page)
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                        continue;
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                page = page_cache_alloc_cold(mapping);
 
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                page = page_cache_alloc_readahead(mapping);
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                if (!page)
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                        break;
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                page->index = page_offset;
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        /* do read-ahead */
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        ondemand_readahead(mapping, ra, filp, true, offset, req_size);
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#ifdef CONFIG_BLOCK
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        /*
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         * Normally the current page is !uptodate and lock_page() will be
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         * immediately called to implicitly unplug the device. However this
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         * is not always true for RAID conifgurations, where data arrives
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         * not strictly in their submission order. In this case we need to
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         * explicitly kick off the IO.
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         */
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        if (PageUptodate(page))
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                blk_run_backing_dev(mapping->backing_dev_info, NULL);
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#endif
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}
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EXPORT_SYMBOL_GPL(page_cache_async_readahead);