cifs: convert wdata_alloc_and_fillpages() to use filemap_get_folios_tag()
This is in preparation for the removal of find_get_pages_range_tag(). Now also supports the use of large folios. Since tofind might be larger than the max number of folios in a folio_batch (15), we loop through filling in wdata->pages pulling more batches until we either reach tofind pages or run out of folios. This function may not return all pages in the last found folio before tofind pages are reached. Link: https://lkml.kernel.org/r/20230104211448.4804-10-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Cc: Tom Talpey <tom@talpey.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -2527,14 +2527,40 @@ wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
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unsigned int *found_pages)
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{
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struct cifs_writedata *wdata;
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struct folio_batch fbatch;
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unsigned int i, idx, p, nr;
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wdata = cifs_writedata_alloc((unsigned int)tofind,
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cifs_writev_complete);
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if (!wdata)
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return NULL;
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*found_pages = find_get_pages_range_tag(mapping, index, end,
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PAGECACHE_TAG_DIRTY, tofind, wdata->pages);
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folio_batch_init(&fbatch);
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*found_pages = 0;
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again:
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nr = filemap_get_folios_tag(mapping, index, end,
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PAGECACHE_TAG_DIRTY, &fbatch);
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if (!nr)
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goto out; /* No dirty pages left in the range */
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for (i = 0; i < nr; i++) {
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struct folio *folio = fbatch.folios[i];
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idx = 0;
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p = folio_nr_pages(folio);
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add_more:
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wdata->pages[*found_pages] = folio_page(folio, idx);
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folio_get(folio);
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if (++*found_pages == tofind) {
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folio_batch_release(&fbatch);
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goto out;
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}
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if (++idx < p)
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goto add_more;
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}
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folio_batch_release(&fbatch);
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goto again;
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out:
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return wdata;
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}
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