On Thu, Jun 13, 2024 at 05:00:27PM +0800, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@xxxxxxxxxx>
>
> iomap_truncate_page() always assumes the block size of the truncating
> inode is i_blocksize(), this is not always true for some filesystems,
> e.g. XFS does extent size alignment for realtime inodes. Drop this
> assumption and pass the block size for zeroing into
> iomap_truncate_page(), allow filesystems to indicate the correct block
> size.
FYI, I still prefer to just kill iomap_truncate_page in it's current
form instead.
> #include "../internal.h"
> @@ -1453,11 +1454,10 @@ iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero,
> EXPORT_SYMBOL_GPL(iomap_zero_range);
>
> int
> -iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
> - const struct iomap_ops *ops)
> +iomap_truncate_page(struct inode *inode, loff_t pos, unsigned int blocksize,
> + bool *did_zero, const struct iomap_ops *ops)
> {
> - unsigned int blocksize = i_blocksize(inode);
> - unsigned int off = pos & (blocksize - 1);
> + unsigned int off = rem_u64(pos, blocksize);
>
> /* Block boundary? Nothing to do */
> if (!off)
> diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> index 378342673925..32306804b01b 100644
> --- a/fs/xfs/xfs_iomap.c
> +++ b/fs/xfs/xfs_iomap.c
> @@ -1471,10 +1471,11 @@ xfs_truncate_page(
> bool *did_zero)
> {
> struct inode *inode = VFS_I(ip);
> + unsigned int blocksize = i_blocksize(inode);
>
> if (IS_DAX(inode))
> return dax_truncate_page(inode, pos, did_zero,
> &xfs_dax_write_iomap_ops);
> - return iomap_truncate_page(inode, pos, did_zero,
> + return iomap_truncate_page(inode, pos, blocksize, did_zero,
> &xfs_buffered_write_iomap_ops);
> }
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 6fc1c858013d..d67bf86ec582 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -273,8 +273,8 @@ int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
> const struct iomap_ops *ops);
> int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
> bool *did_zero, const struct iomap_ops *ops);
> -int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
> - const struct iomap_ops *ops);
> +int iomap_truncate_page(struct inode *inode, loff_t pos, unsigned int blocksize,
> + bool *did_zero, const struct iomap_ops *ops);
> vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf,
> const struct iomap_ops *ops);
> int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
> --
> 2.39.2
>
>
---end quoted text---
