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gfs2: convert gfs2_getjdatabuf to use a folio

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Use the folio APIs, saving four hidden calls to compound_head().

Link: https://lkml.kernel.org/r/20231016201114.1928083-9-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-10-16 21:10:55 +01:00 committed by Andrew Morton
parent 0eb751791d
commit c646e57372
1 changed files with 8 additions and 14 deletions
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22
fs/gfs2/meta_io.c
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@ -400,26 +400,20 @@ static struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
{
struct address_space *mapping = ip->i_inode.i_mapping;
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct page *page;
struct folio *folio;
struct buffer_head *bh;
unsigned int shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
unsigned long index = blkno >> shift; /* convert block to page */
unsigned int bufnum = blkno - (index << shift);
page = find_get_page_flags(mapping, index, FGP_LOCK|FGP_ACCESSED);
if (!page)
folio = __filemap_get_folio(mapping, index, FGP_LOCK | FGP_ACCESSED, 0);
if (IS_ERR(folio))
return NULL;
if (!page_has_buffers(page)) {
unlock_page(page);
put_page(page);
return NULL;
}
/* Locate header for our buffer within our page */
for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
/* Do nothing */;
get_bh(bh);
unlock_page(page);
put_page(page);
bh = folio_buffers(folio);
if (bh)
bh = get_nth_bh(bh, bufnum);
folio_unlock(folio);
folio_put(folio);
return bh;
}