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iomap: Use kzalloc to allocate iomap_page 

We can skip most of the initialisation, although spinlocks still
need explicit initialisation as architectures may use a non-zero
value to indicate unlocked.  The comment is no longer useful as
attach_page_private() handles the refcount now.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-09-21 08:58:39 -07:00 committed by Darrick J. Wong
parent 24addd848a
commit a6901d4d14
1 changed files with 1 additions and 9 deletions
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10
fs/iomap/buffered-io.c
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@ -49,16 +49,8 @@ iomap_page_create(struct inode *inode, struct page *page)
if (iop || i_blocks_per_page(inode, page) <= 1)
return iop;
iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
atomic_set(&iop->read_count, 0);
atomic_set(&iop->write_count, 0);
iop = kzalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
spin_lock_init(&iop->uptodate_lock);
bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
/*
* migrate_page_move_mapping() assumes that pages with private data have
* their count elevated by 1.
*/
attach_page_private(page, iop);
return iop;
}