From 0f78d06ac1e9b470cbd8f913ee1688c8b2c8feb3 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Mon, 20 Feb 2017 16:51:23 +0100 Subject: vfs: pass type instead of fn to do_{loop,iter}_readv_writev() Signed-off-by: Miklos Szeredi --- fs/read_write.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 12a216021f87..198614f757fa 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -23,9 +23,6 @@ #include #include -typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); -typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); - const struct file_operations generic_ro_fops = { .llseek = generic_file_llseek, .read_iter = generic_file_read_iter, @@ -675,7 +672,7 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) EXPORT_SYMBOL(iov_shorten); static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, - loff_t *ppos, iter_fn_t fn, int flags) + loff_t *ppos, int type, int flags) { struct kiocb kiocb; ssize_t ret; @@ -692,7 +689,10 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC); kiocb.ki_pos = *ppos; - ret = fn(&kiocb, iter); + if (type == READ) + ret = filp->f_op->read_iter(&kiocb, iter); + else + ret = filp->f_op->write_iter(&kiocb, iter); BUG_ON(ret == -EIOCBQUEUED); *ppos = kiocb.ki_pos; return ret; @@ -700,7 +700,7 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, /* Do it by hand, with file-ops */ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, - loff_t *ppos, io_fn_t fn, int flags) + loff_t *ppos, int type, int flags) { ssize_t ret = 0; @@ -711,7 +711,13 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, struct iovec iovec = iov_iter_iovec(iter); ssize_t nr; - nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos); + if (type == READ) { + nr = filp->f_op->read(filp, iovec.iov_base, + iovec.iov_len, ppos); + } else { + nr = filp->f_op->write(filp, iovec.iov_base, + iovec.iov_len, ppos); + } if (nr < 0) { if (!ret) @@ -839,8 +845,6 @@ static ssize_t __do_readv_writev(int type, struct file *file, { size_t tot_len; ssize_t ret = 0; - io_fn_t fn; - iter_fn_t iter_fn; tot_len = iov_iter_count(iter); if (!tot_len) @@ -849,19 +853,14 @@ static ssize_t __do_readv_writev(int type, struct file *file, if (ret < 0) goto out; - if (type == READ) { - fn = file->f_op->read; - iter_fn = file->f_op->read_iter; - } else { - fn = (io_fn_t)file->f_op->write; - iter_fn = file->f_op->write_iter; + if (type != READ) file_start_write(file); - } - if (iter_fn) - ret = do_iter_readv_writev(file, iter, pos, iter_fn, flags); + if ((type == READ && file->f_op->read_iter) || + (type == WRITE && file->f_op->write_iter)) + ret = do_iter_readv_writev(file, iter, pos, type, flags); else - ret = do_loop_readv_writev(file, iter, pos, fn, flags); + ret = do_loop_readv_writev(file, iter, pos, type, flags); if (type != READ) file_end_write(file); -- cgit v1.2.3-59-g8ed1b