From c829d0bd33ac0df8cece64e50ec71a63f17790f8 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 22 May 2023 14:50:01 +0100 Subject: [PATCH] 9p: Add splice_read wrapper Add a splice_read wrapper for 9p. We should use copy_splice_read() if 9PL_DIRECT is set and filemap_splice_read() otherwise. Note that this doesn't seem to be particularly related to O_DIRECT. Signed-off-by: David Howells cc: Christoph Hellwig cc: Al Viro cc: Jens Axboe cc: Dominique Martinet cc: Eric Van Hensbergen cc: Latchesar Ionkov cc: Christian Schoenebeck cc: v9fs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org cc: linux-block@vger.kernel.org cc: linux-mm@kvack.org Link: https://lore.kernel.org/r/20230522135018.2742245-15-dhowells@redhat.com Signed-off-by: Jens Axboe --- fs/9p/vfs_file.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 6c31b8c..2996fb0 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -374,6 +374,28 @@ v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) return ret; } +/* + * v9fs_file_splice_read - splice-read from a file + * @in: The 9p file to read from + * @ppos: Where to find/update the file position + * @pipe: The pipe to splice into + * @len: The maximum amount of data to splice + * @flags: SPLICE_F_* flags + */ +static ssize_t v9fs_file_splice_read(struct file *in, loff_t *ppos, + struct pipe_inode_info *pipe, + size_t len, unsigned int flags) +{ + struct p9_fid *fid = in->private_data; + + p9_debug(P9_DEBUG_VFS, "fid %d count %zu offset %lld\n", + fid->fid, len, *ppos); + + if (fid->mode & P9L_DIRECT) + return copy_splice_read(in, ppos, pipe, len, flags); + return filemap_splice_read(in, ppos, pipe, len, flags); +} + /** * v9fs_file_write_iter - write to a file * @iocb: The operation parameters @@ -569,7 +591,7 @@ const struct file_operations v9fs_file_operations = { .release = v9fs_dir_release, .lock = v9fs_file_lock, .mmap = generic_file_readonly_mmap, - .splice_read = generic_file_splice_read, + .splice_read = v9fs_file_splice_read, .splice_write = iter_file_splice_write, .fsync = v9fs_file_fsync, }; @@ -583,7 +605,7 @@ const struct file_operations v9fs_file_operations_dotl = { .lock = v9fs_file_lock_dotl, .flock = v9fs_file_flock_dotl, .mmap = v9fs_file_mmap, - .splice_read = generic_file_splice_read, + .splice_read = v9fs_file_splice_read, .splice_write = iter_file_splice_write, .fsync = v9fs_file_fsync_dotl, }; -- 2.7.4