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gfs2: don't use buffer_heads in gfs2_allocate_page_backing

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Rewrite gfs2_allocate_page_backing to call gfs2_iomap_get_alloc and operate on
struct iomap directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Christoph Hellwig 2019-07-01 23:54:38 +02:00 committed by Andreas Gruenbacher
parent 7770c93a46
commit 35af80aef9
1 changed files with 16 additions and 17 deletions
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33
fs/gfs2/file.c
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@ -363,31 +363,30 @@ static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
}
/**
* gfs2_allocate_page_backing - Use bmap to allocate blocks
* gfs2_allocate_page_backing - Allocate blocks for a write fault
* @page: The (locked) page to allocate backing for
*
* We try to allocate all the blocks required for the page in
* one go. This might fail for various reasons, so we keep
* trying until all the blocks to back this page are allocated.
* If some of the blocks are already allocated, thats ok too.
* We try to allocate all the blocks required for the page in one go. This
* might fail for various reasons, so we keep trying until all the blocks to
* back this page are allocated. If some of the blocks are already allocated,
* that is ok too.
*/
static int gfs2_allocate_page_backing(struct page *page)
{
struct inode *inode = page->mapping->host;
struct buffer_head bh;
unsigned long size = PAGE_SIZE;
u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits);
u64 pos = page_offset(page);
u64 size = PAGE_SIZE;
do {
bh.b_state = 0;
bh.b_size = size;
gfs2_block_map(inode, lblock, &bh, 1);
if (!buffer_mapped(&bh))
struct iomap iomap = { };
if (gfs2_iomap_get_alloc(page->mapping->host, pos, 1, &iomap))
return -EIO;
size -= bh.b_size;
lblock += (bh.b_size >> inode->i_blkbits);
} while(size > 0);
iomap.length = min(iomap.length, size);
size -= iomap.length;
pos += iomap.length;
} while (size > 0);
return 0;
}