From 534f2aaa6ab07cd71164180bc958a7dcde41db11 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 1 Jun 2007 14:52:37 +0200 Subject: sys_sendfile: switch to using ->splice_read, if available This patch makes sendfile prefer to use ->splice_read(), if it's available in the file_operations structure. Signed-off-by: Jens Axboe --- fs/read_write.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/read_write.c b/fs/read_write.c index 4d03008f015b..47da8a4a0fbe 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "read_write.h" #include @@ -25,7 +26,7 @@ const struct file_operations generic_ro_fops = { .read = do_sync_read, .aio_read = generic_file_aio_read, .mmap = generic_file_readonly_mmap, - .sendfile = generic_file_sendfile, + .splice_read = generic_file_splice_read, }; EXPORT_SYMBOL(generic_ro_fops); @@ -708,7 +709,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, struct inode * in_inode, * out_inode; loff_t pos; ssize_t retval; - int fput_needed_in, fput_needed_out; + int fput_needed_in, fput_needed_out, fl; /* * Get input file, and verify that it is ok.. @@ -723,7 +724,8 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, in_inode = in_file->f_path.dentry->d_inode; if (!in_inode) goto fput_in; - if (!in_file->f_op || !in_file->f_op->sendfile) + if (!in_file->f_op || (!in_file->f_op->sendfile && + !in_file->f_op->splice_read)) goto fput_in; retval = -ESPIPE; if (!ppos) @@ -776,7 +778,21 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, count = max - pos; } - retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file); + if (in_file->f_op->splice_read) { + fl = 0; +#if 0 + /* + * We need to debate whether we can enable this or not. The + * man page documents EAGAIN return for the output at least, + * and the application is arguably buggy if it doesn't expect + * EAGAIN on a non-blocking file descriptor. + */ + if (in_file->f_flags & O_NONBLOCK) + fl = SPLICE_F_NONBLOCK; +#endif + retval = do_splice_direct(in_file, ppos, out_file, count, fl); + } else + retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file); if (retval > 0) { add_rchar(current, retval); -- cgit v1.2.2