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proc: switch /proc/scsi/device_info to seq_file interface 

Note 1: 0644 should be used, but root bypasses permissions, so writing
	to /proc/scsi/device_info still works.
Note 2: looks like scsi_dev_info_list is unprotected
Note 3: probably make proc whine about "unwriteable but with ->write hook"
	entries. Probably.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2008-04-29 01:01:55 -07:00 committed by Linus Torvalds
parent 4a5cdb5b8f
commit 352ced8e59
1 changed files with 44 additions and 33 deletions
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75
drivers/scsi/scsi_devinfo.c
View File

@ -449,37 +449,40 @@ int scsi_get_device_flags(struct scsi_device *sdev,
}
#ifdef CONFIG_SCSI_PROC_FS
/*
* proc_scsi_dev_info_read: dump the scsi_dev_info_list via
* /proc/scsi/device_info
*/
static int proc_scsi_devinfo_read(char *buffer, char **start,
off_t offset, int length)
static int devinfo_seq_show(struct seq_file *m, void *v)
{
struct scsi_dev_info_list *devinfo;
int size, len = 0;
off_t begin = 0;
off_t pos = 0;
struct scsi_dev_info_list *devinfo =
list_entry(v, struct scsi_dev_info_list, dev_info_list);
list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
seq_printf(m, "'%.8s' '%.16s' 0x%x\n",
devinfo->vendor, devinfo->model, devinfo->flags);
len += size;
pos = begin + len;
if (pos < offset) {
len = 0;
begin = pos;
}
if (pos > offset + length)
goto stop_output;
return 0;
}
stop_output:
*start = buffer + (offset - begin); /* Start of wanted data */
len -= (offset - begin); /* Start slop */
if (len > length)
len = length; /* Ending slop */
return (len);
static void * devinfo_seq_start(struct seq_file *m, loff_t *pos)
{
return seq_list_start(&scsi_dev_info_list, *pos);
}
static void * devinfo_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
return seq_list_next(v, &scsi_dev_info_list, pos);
}
static void devinfo_seq_stop(struct seq_file *m, void *v)
{
}
static const struct seq_operations scsi_devinfo_seq_ops = {
.start = devinfo_seq_start,
.next = devinfo_seq_next,
.stop = devinfo_seq_stop,
.show = devinfo_seq_show,
};
static int proc_scsi_devinfo_open(struct inode *inode, struct file *file)
{
return seq_open(file, &scsi_devinfo_seq_ops);
}
/*
@ -489,11 +492,12 @@ stop_output:
* integer value of flag to the scsi device info list.
* To use, echo "vendor:model:flag" > /proc/scsi/device_info
*/
static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
unsigned long length, void *data)
static ssize_t proc_scsi_devinfo_write(struct file *file,
const char __user *buf,
size_t length, loff_t *ppos)
{
char *buffer;
int err = length;
ssize_t err = length;
if (!buf || length>PAGE_SIZE)
return -EINVAL;
@ -517,6 +521,15 @@ out:
free_page((unsigned long)buffer);
return err;
}
static const struct file_operations scsi_devinfo_proc_fops = {
.owner = THIS_MODULE,
.open = proc_scsi_devinfo_open,
.read = seq_read,
.write = proc_scsi_devinfo_write,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* CONFIG_SCSI_PROC_FS */
module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
@ -577,15 +590,13 @@ int __init scsi_init_devinfo(void)
}
#ifdef CONFIG_SCSI_PROC_FS
p = create_proc_entry("scsi/device_info", 0, NULL);
p = proc_create("scsi/device_info", 0, NULL, &scsi_devinfo_proc_fops);
if (!p) {
error = -ENOMEM;
goto out;
}
p->owner = THIS_MODULE;
p->get_info = proc_scsi_devinfo_read;
p->write_proc = proc_scsi_devinfo_write;
#endif /* CONFIG_SCSI_PROC_FS */
out: