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target: use vfs_iter_read/write in fd_do_rw 

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2015-02-22 08:48:41 -08:00 committed by Nicholas Bellinger
parent c517d838eb
commit 6b9a44d093
1 changed files with 14 additions and 17 deletions
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31
drivers/target/target_core_file.c
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@ -331,36 +331,33 @@ static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
struct fd_dev *dev = FD_DEV(se_dev);
struct file *fd = dev->fd_file;
struct scatterlist *sg;
struct iovec *iov;
mm_segment_t old_fs;
struct iov_iter iter;
struct bio_vec *bvec;
ssize_t len = 0;
loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
int ret = 0, i;
iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
if (!iov) {
bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
if (!bvec) {
pr_err("Unable to allocate fd_do_readv iov[]\n");
return -ENOMEM;
}
for_each_sg(sgl, sg, sgl_nents, i) {
iov[i].iov_len = sg->length;
iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
bvec[i].bv_page = sg_page(sg);
bvec[i].bv_len = sg->length;
bvec[i].bv_offset = sg->offset;
len += sg->length;
}
old_fs = get_fs();
set_fs(get_ds());
iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
if (is_write)
ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
ret = vfs_iter_write(fd, &iter, &pos);
else
ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
ret = vfs_iter_read(fd, &iter, &pos);
set_fs(old_fs);
for_each_sg(sgl, sg, sgl_nents, i)
kunmap(sg_page(sg));
kfree(iov);
kfree(bvec);
if (is_write) {
if (ret < 0 || ret != cmd->data_length) {