cifs: use find_get_pages_range_tag()
wdata_alloc_and_fillpages() needlessly iterates calls to find_get_pages_tag(). Also it wants only pages from given range. Make it use find_get_pages_range_tag(). Link: http://lkml.kernel.org/r/20171009151359.31984-17-jack@suse.cz Signed-off-by: Jan Kara <jack@suse.cz> Suggested-by: Daniel Jordan <daniel.m.jordan@oracle.com> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Steve French <sfrench@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1963,8 +1963,6 @@ wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
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pgoff_t end, pgoff_t *index,
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unsigned int *found_pages)
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{
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unsigned int nr_pages;
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struct page **pages;
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struct cifs_writedata *wdata;
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wdata = cifs_writedata_alloc((unsigned int)tofind,
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@ -1972,23 +1970,8 @@ wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
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if (!wdata)
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return NULL;
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/*
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* find_get_pages_tag seems to return a max of 256 on each
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* iteration, so we must call it several times in order to
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* fill the array or the wsize is effectively limited to
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* 256 * PAGE_SIZE.
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*/
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*found_pages = 0;
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pages = wdata->pages;
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do {
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nr_pages = find_get_pages_tag(mapping, index,
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PAGECACHE_TAG_DIRTY, tofind,
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pages);
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*found_pages += nr_pages;
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tofind -= nr_pages;
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pages += nr_pages;
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} while (nr_pages && tofind && *index <= end);
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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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return wdata;
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}
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