vfs: pass type instead of fn to do_{loop,iter}_readv_writev()
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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7687a7a443
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0f78d06ac1
@ -23,9 +23,6 @@
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#include <linux/uaccess.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/unistd.h>
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typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
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typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *);
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const struct file_operations generic_ro_fops = {
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const struct file_operations generic_ro_fops = {
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.llseek = generic_file_llseek,
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.read_iter = generic_file_read_iter,
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@ -675,7 +672,7 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
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EXPORT_SYMBOL(iov_shorten);
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EXPORT_SYMBOL(iov_shorten);
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static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
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static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
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loff_t *ppos, iter_fn_t fn, int flags)
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loff_t *ppos, int type, int flags)
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{
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{
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struct kiocb kiocb;
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struct kiocb kiocb;
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ssize_t ret;
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ssize_t ret;
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@ -692,7 +689,10 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
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kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
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kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
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kiocb.ki_pos = *ppos;
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kiocb.ki_pos = *ppos;
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ret = fn(&kiocb, iter);
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if (type == READ)
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ret = filp->f_op->read_iter(&kiocb, iter);
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else
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ret = filp->f_op->write_iter(&kiocb, iter);
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BUG_ON(ret == -EIOCBQUEUED);
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BUG_ON(ret == -EIOCBQUEUED);
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*ppos = kiocb.ki_pos;
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*ppos = kiocb.ki_pos;
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return ret;
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return ret;
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@ -700,7 +700,7 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
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/* Do it by hand, with file-ops */
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/* Do it by hand, with file-ops */
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static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
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static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
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loff_t *ppos, io_fn_t fn, int flags)
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loff_t *ppos, int type, int flags)
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{
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{
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ssize_t ret = 0;
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ssize_t ret = 0;
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@ -711,7 +711,13 @@ static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
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struct iovec iovec = iov_iter_iovec(iter);
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struct iovec iovec = iov_iter_iovec(iter);
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ssize_t nr;
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ssize_t nr;
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nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos);
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if (type == READ) {
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nr = filp->f_op->read(filp, iovec.iov_base,
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iovec.iov_len, ppos);
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} else {
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nr = filp->f_op->write(filp, iovec.iov_base,
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iovec.iov_len, ppos);
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}
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if (nr < 0) {
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if (nr < 0) {
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if (!ret)
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if (!ret)
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@ -839,8 +845,6 @@ static ssize_t __do_readv_writev(int type, struct file *file,
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{
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{
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size_t tot_len;
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size_t tot_len;
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ssize_t ret = 0;
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ssize_t ret = 0;
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io_fn_t fn;
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iter_fn_t iter_fn;
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tot_len = iov_iter_count(iter);
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tot_len = iov_iter_count(iter);
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if (!tot_len)
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if (!tot_len)
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@ -849,19 +853,14 @@ static ssize_t __do_readv_writev(int type, struct file *file,
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if (ret < 0)
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if (ret < 0)
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goto out;
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goto out;
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if (type == READ) {
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if (type != READ)
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fn = file->f_op->read;
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iter_fn = file->f_op->read_iter;
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} else {
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fn = (io_fn_t)file->f_op->write;
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iter_fn = file->f_op->write_iter;
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file_start_write(file);
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file_start_write(file);
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}
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if (iter_fn)
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if ((type == READ && file->f_op->read_iter) ||
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ret = do_iter_readv_writev(file, iter, pos, iter_fn, flags);
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(type == WRITE && file->f_op->write_iter))
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ret = do_iter_readv_writev(file, iter, pos, type, flags);
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else
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else
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ret = do_loop_readv_writev(file, iter, pos, fn, flags);
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ret = do_loop_readv_writev(file, iter, pos, type, flags);
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if (type != READ)
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if (type != READ)
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file_end_write(file);
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file_end_write(file);
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