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Date: Mon, 19 Oct 2009 15:56:30 +0800 From: Changli Gao <xiaosuo@...il.com> To: Linus Torvalds <torvalds@...ux-foundation.org> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, xiaosuo <xiaosuo@...il.com> Subject: PATCH: sendfile() checks f_op.sendpage() instead of f_op.splice_write() wrongly sendfile(2) checks f_op.sendpage() instead of f_op.splice_write() wrongly. sendfile(2) was reworked with the splice infrastructure, but it still checks f_op.sendpage() instead of f_op.splice_write() wrongly. Although if f_op.sendpage() exists, f_op.splice_write() always exists at the same time currently, the assumption will be broken in future silently. This patch also brings a side effect: sendfile(2) can work with any output file, which supports splice_write() not only mmap(2). Signed-off-by: Changli Gao <xiaosuo@...il.com> ---- fs/read_write.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/read_write.c +++ b/fs/read_write.c @@ -826,7 +826,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, if (!(out_file->f_mode & FMODE_WRITE)) goto fput_out; retval = -EINVAL; - if (!out_file->f_op || !out_file->f_op->sendpage) + if (!out_file->f_op || !out_file->f_op->splice_write) goto fput_out; in_inode = in_file->f_path.dentry->d_inode; out_inode = out_file->f_path.dentry->d_inode; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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