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SubjectRe: [PATCH v2 2/9] fs: Introduce i_blocks_per_page
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On 9/10/20 6:47 PM, Matthew Wilcox (Oracle) wrote:
> This helper is useful for both THPs and for supporting block size larger
> than page size. Convert all users that I could find (we have a few
> different ways of writing this idiom, and I may have missed some).
>
> 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>

For jfs:
Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>

> ---
> fs/iomap/buffered-io.c | 8 ++++----
> fs/jfs/jfs_metapage.c | 2 +-
> fs/xfs/xfs_aops.c | 2 +-
> include/linux/pagemap.h | 16 ++++++++++++++++
> 4 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index d81a9a86c5aa..330f86b825d7 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -46,7 +46,7 @@ iomap_page_create(struct inode *inode, struct page *page)
> {
> struct iomap_page *iop = to_iomap_page(page);
>
> - if (iop || i_blocksize(inode) == PAGE_SIZE)
> + if (iop || i_blocks_per_page(inode, page) <= 1)
> return iop;
>
> iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
> @@ -147,7 +147,7 @@ iomap_iop_set_range_uptodate(struct page *page, unsigned off, unsigned len)
> unsigned int i;
>
> spin_lock_irqsave(&iop->uptodate_lock, flags);
> - for (i = 0; i < PAGE_SIZE / i_blocksize(inode); i++) {
> + for (i = 0; i < i_blocks_per_page(inode, page); i++) {
> if (i >= first && i <= last)
> set_bit(i, iop->uptodate);
> else if (!test_bit(i, iop->uptodate))
> @@ -1077,7 +1077,7 @@ iomap_finish_page_writeback(struct inode *inode, struct page *page,
> mapping_set_error(inode->i_mapping, -EIO);
> }
>
> - WARN_ON_ONCE(i_blocksize(inode) < PAGE_SIZE && !iop);
> + WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);
> WARN_ON_ONCE(iop && atomic_read(&iop->write_count) <= 0);
>
> if (!iop || atomic_dec_and_test(&iop->write_count))
> @@ -1373,7 +1373,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
> int error = 0, count = 0, i;
> LIST_HEAD(submit_list);
>
> - WARN_ON_ONCE(i_blocksize(inode) < PAGE_SIZE && !iop);
> + WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);
> WARN_ON_ONCE(iop && atomic_read(&iop->write_count) != 0);
>
> /*
> diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
> index a2f5338a5ea1..176580f54af9 100644
> --- a/fs/jfs/jfs_metapage.c
> +++ b/fs/jfs/jfs_metapage.c
> @@ -473,7 +473,7 @@ static int metapage_readpage(struct file *fp, struct page *page)
> struct inode *inode = page->mapping->host;
> struct bio *bio = NULL;
> int block_offset;
> - int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
> + int blocks_per_page = i_blocks_per_page(inode, page);
> sector_t page_start; /* address of page in fs blocks */
> sector_t pblock;
> int xlen;
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index b35611882ff9..55d126d4e096 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -544,7 +544,7 @@ xfs_discard_page(
> page, ip->i_ino, offset);
>
> error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
> - PAGE_SIZE / i_blocksize(inode));
> + i_blocks_per_page(inode, page));
> if (error && !XFS_FORCED_SHUTDOWN(mp))
> xfs_alert(mp, "page discard unable to remove delalloc mapping.");
> out_invalidate:
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 50d2c39b47ab..f7f602040913 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -975,4 +975,20 @@ static inline int page_mkwrite_check_truncate(struct page *page,
> return offset;
> }
>
> +/**
> + * i_blocks_per_page - How many blocks fit in this page.
> + * @inode: The inode which contains the blocks.
> + * @page: The page (head page if the page is a THP).
> + *
> + * If the block size is larger than the size of this page, return zero.
> + *
> + * Context: The caller should hold a refcount on the page to prevent it
> + * from being split.
> + * Return: The number of filesystem blocks covered by this page.
> + */
> +static inline
> +unsigned int i_blocks_per_page(struct inode *inode, struct page *page)
> +{
> + return thp_size(page) >> inode->i_blkbits;
> +}
> #endif /* _LINUX_PAGEMAP_H */
>

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