Re: [PATCH v3] fuse: invalidate the page cache after direct write

[Markus Elfring]

…
> +++ b/fs/fuse/file.c
> @@ -667,6 +667,18 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
>  			struct inode *inode = file_inode(io->iocb->ki_filp);
>  			struct fuse_conn *fc = get_fuse_conn(inode);
>  			struct fuse_inode *fi = get_fuse_inode(inode);
> +			struct address_space *mapping = io->iocb->ki_filp->f_mapping;
> +
> +			/*
> +			 * As in generic_file_direct_write(), invalidate after the
> +			 * write, to invalidate read-ahead cache that may have competed
> +			 * with the write.
> +			 */
> +			if (io->write && res && mapping->nrpages) {
> +				invalidate_inode_pages2_range(mapping,
> +						io->offset >> PAGE_SHIFT,
> +						(io->offset + res - 1) >> PAGE_SHIFT);
> +			}
>  
>  			spin_lock(&fi->lock);
…
> @@ -1160,10 +1174,26 @@ static ssize_t fuse_send_write(struct fuse_io_args *ia, loff_t pos,
…
-	return err ?: ia->write.out.size;
> +	/*
> +	 * Without FOPEN_DIRECT_IO, generic_file_direct_write() does the
> +	 * invalidation for us.
> +	 */
> +	if (!err && written && mapping->nrpages &&
> +	    (ff->open_flags & FOPEN_DIRECT_IO)) {
> +		/*
> +		 * As in generic_file_direct_write(), invalidate after the
> +		 * write, to invalidate read-ahead cache that may have competed
> +		 * with the write.
> +		 */
> +		invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT,
> +					(pos + written - 1) >> PAGE_SHIFT);
> +	}
> +
> +	return err ?: written;
…

You may omit curly brackets at selected source code places.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?h=v6.19-rc4#n197

Regards,
Markus