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gfs2: convert gfs2_getbuf() to folios

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Remove several folio->page->folio conversions.  Also use __GFP_NOFAIL
instead of calling yield() and the new get_nth_bh().

Link: https://lkml.kernel.org/r/20231016201114.1928083-8-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 21:10:54 +01:00 committed by Andrew Morton
parent 81cb277ebd
commit 0eb751791d
1 changed files with 17 additions and 22 deletions
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39
fs/gfs2/meta_io.c
View file

@ -115,7 +115,7 @@ struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
{
struct address_space *mapping = gfs2_glock2aspace(gl);
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct page *page;
struct folio *folio;
struct buffer_head *bh;
unsigned int shift;
unsigned long index;
@ -129,36 +129,31 @@ struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
bufnum = blkno - (index << shift); /* block buf index within page */
if (create) {
for (;;) {
page = grab_cache_page(mapping, index);
if (page)
break;
yield();
}
if (!page_has_buffers(page))
create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
folio = __filemap_get_folio(mapping, index,
FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
mapping_gfp_mask(mapping) | __GFP_NOFAIL);
bh = folio_buffers(folio);
if (!bh)
bh = folio_create_empty_buffers(folio,
sdp->sd_sb.sb_bsize, 0);
} else {
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)) {
bh = NULL;
goto out_unlock;
}
bh = folio_buffers(folio);
}
/* Locate header for our buffer within our page */
for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
/* Do nothing */;
get_bh(bh);
if (!bh)
goto out_unlock;
bh = get_nth_bh(bh, bufnum);
if (!buffer_mapped(bh))
map_bh(bh, sdp->sd_vfs, blkno);
out_unlock:
unlock_page(page);
put_page(page);
folio_unlock(folio);
folio_put(folio);
return bh;
}