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authorAl Viro <viro@zeniv.linux.org.uk>2013-03-31 07:58:05 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-04-09 22:13:14 +0400
commit0ffddfbb834557b8babc7f050b83d11dbcbb1008 (patch)
tree620afe52d29443b4ad10f805afe6b22d43349e5f /drivers/scsi/scsi_proc.c
parentb6cdc7310338e204224f865918f774eb6db0b75d (diff)
downloadlinux-0ffddfbb834557b8babc7f050b83d11dbcbb1008.tar.xz
scsi: saner replacements for ->proc_info()
It's still an obsolete interface; don't introduce those in new drivers. However, it's saner than the ->proc_info() and commits after this one will convert the existing ->proc_info() users to it. The read side is ->show_info(seq_file *, struct Scsi_Host *); use seq_... for generating contents. The write side is ->write_info(struct Scsi_Host *, char *, int). Again, this is driven by procfs needs; we are going to kill ->write_proc() and ->read_proc() and this is the main obstacle to burying that piece of shit. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/scsi/scsi_proc.c')
-rw-r--r--drivers/scsi/scsi_proc.c68
1 files changed, 59 insertions, 9 deletions
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index ad747dc337da..6f4c3cff03bb 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -97,6 +97,49 @@ out:
return ret;
}
+static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct Scsi_Host *shost = PDE(file_inode(file))->data;
+ ssize_t ret = -ENOMEM;
+ char *page;
+
+ if (count > PROC_BLOCK_SIZE)
+ return -EOVERFLOW;
+
+ if (!shost->hostt->write_info)
+ return -EINVAL;
+
+ page = (char *)__get_free_page(GFP_KERNEL);
+ if (page) {
+ ret = -EFAULT;
+ if (copy_from_user(page, buf, count))
+ goto out;
+ ret = shost->hostt->write_info(shost, page, count);
+ }
+out:
+ free_page((unsigned long)page);
+ return ret;
+}
+
+static int proc_scsi_show(struct seq_file *m, void *v)
+{
+ struct Scsi_Host *shost = m->private;
+ return shost->hostt->show_info(m, shost);
+}
+
+static int proc_scsi_host_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_scsi_show, PDE(inode)->data);
+}
+
+static const struct file_operations proc_scsi_fops = {
+ .open = proc_scsi_host_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = proc_scsi_host_write
+};
+
/**
* scsi_proc_hostdir_add - Create directory in /proc for a scsi host
* @sht: owner of this directory
@@ -106,7 +149,7 @@ out:
void scsi_proc_hostdir_add(struct scsi_host_template *sht)
{
- if (!sht->proc_info)
+ if (!sht->proc_info && !sht->show_info)
return;
mutex_lock(&global_host_template_mutex);
@@ -125,7 +168,7 @@ void scsi_proc_hostdir_add(struct scsi_host_template *sht)
*/
void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
{
- if (!sht->proc_info)
+ if (!sht->proc_info && !sht->show_info)
return;
mutex_lock(&global_host_template_mutex);
@@ -151,16 +194,23 @@ void scsi_proc_host_add(struct Scsi_Host *shost)
return;
sprintf(name,"%d", shost->host_no);
+ if (sht->show_info) {
+ p = proc_create_data(name, S_IRUGO | S_IWUSR,
+ sht->proc_dir, &proc_scsi_fops, shost);
+ if (!p)
+ goto Fail;
+ return;
+ }
p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
sht->proc_dir, proc_scsi_read, shost);
- if (!p) {
- printk(KERN_ERR "%s: Failed to register host %d in"
- "%s\n", __func__, shost->host_no,
- sht->proc_name);
+ if (p) {
+ p->write_proc = proc_scsi_write_proc;
return;
- }
-
- p->write_proc = proc_scsi_write_proc;
+ }
+Fail:
+ printk(KERN_ERR "%s: Failed to register host %d in"
+ "%s\n", __func__, shost->host_no,
+ sht->proc_name);
}
/**