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target/file: merge fd_do_readv() and fd_do_writev() 

Those two functions are almost identical so merge them. Noticed this
while fixing the highmem in both cases.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sebastian Andrzej Siewior 2012-12-05 13:09:45 -08:00 committed by Nicholas Bellinger
parent 40ff2c3b3d
commit 778229af95
1 changed files with 32 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/target/target_core_file.c
View File

@ -216,8 +216,8 @@ static void fd_free_device(struct se_device *dev)
kfree(fd_dev);
}
static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
u32 sgl_nents)
static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
u32 sgl_nents, int is_write)
{
struct se_device *se_dev = cmd->se_dev;
struct fd_dev *dev = FD_DEV(se_dev);
@ -241,12 +241,25 @@ static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
old_fs = get_fs();
set_fs(get_ds());
if (is_write)
ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
else
ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
set_fs(old_fs);
for_each_sg(sgl, sg, sgl_nents, i)
kunmap(sg_page(sg));
kfree(iov);
if (is_write) {
if (ret < 0 || ret != cmd->data_length) {
pr_err("%s() write returned %d\n", __func__, ret);
return (ret < 0 ? ret : -EINVAL);
}
} else {
/*
* Return zeros and GOOD status even if the READ did not return
* the expected virt_size for struct file w/o a backing struct
@ -254,60 +267,19 @@ static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
*/
if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
if (ret < 0 || ret != cmd->data_length) {
pr_err("vfs_readv() returned %d,"
" expecting %d for S_ISBLK\n", ret,
(int)cmd->data_length);
pr_err("%s() returned %d, expecting %u for "
"S_ISBLK\n", __func__, ret,
cmd->data_length);
return (ret < 0 ? ret : -EINVAL);
}
} else {
if (ret < 0) {
pr_err("vfs_readv() returned %d for non"
" S_ISBLK\n", ret);
pr_err("%s() returned %d for non S_ISBLK\n",
__func__, ret);
return ret;
}
}
return 1;
}
static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl,
u32 sgl_nents)
{
struct se_device *se_dev = cmd->se_dev;
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;
loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
int ret, i = 0;
iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
if (!iov) {
pr_err("Unable to allocate fd_do_writev 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;
}
old_fs = get_fs();
set_fs(get_ds());
ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
set_fs(old_fs);
for_each_sg(sgl, sg, sgl_nents, i)
kunmap(sg_page(sg));
kfree(iov);
if (ret < 0 || ret != cmd->data_length) {
pr_err("vfs_writev() returned %d\n", ret);
return (ret < 0 ? ret : -EINVAL);
}
return 1;
}
@ -370,9 +342,9 @@ fd_execute_rw(struct se_cmd *cmd)
* physical memory addresses to struct iovec virtual memory.
*/
if (data_direction == DMA_FROM_DEVICE) {
ret = fd_do_readv(cmd, sgl, sgl_nents);
ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
} else {
ret = fd_do_writev(cmd, sgl, sgl_nents);
ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
/*
* Perform implict vfs_fsync_range() for fd_do_writev() ops
* for SCSI WRITEs with Forced Unit Access (FUA) set.