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[PATCH] s390: convert /proc/cio_ignore

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Convert /proc/cio_ignore to a sequential file.  This makes multiple subchannel
sets support easier.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Cornelia Huck 2006-01-06 00:19:24 -08:00 committed by Linus Torvalds
parent a28c694481
commit 678a395b35
1 changed files with 92 additions and 30 deletions
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122
drivers/s390/cio/blacklist.c
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@ -15,6 +15,7 @@
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/device.h>
@ -279,41 +280,82 @@ blacklist_parse_proc_parameters (char *buf)
s390_redo_validation ();
}
/* FIXME: These should be real bus ids and not home-grown ones! */
static int cio_ignore_read (char *page, char **start, off_t off,
int count, int *eof, void *data)
/* Iterator struct for all devices. */
struct ccwdev_iter {
int devno;
int in_range;
};
static void *
cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
{
const unsigned int entry_size = 18; /* "0.0.ABCD-0.0.EFGH\n" */
long devno;
int len;
struct ccwdev_iter *iter;
len = 0;
for (devno = off; /* abuse the page variable
* as counter, see fs/proc/generic.c */
devno < __MAX_SUBCHANNEL && len + entry_size < count; devno++) {
if (!test_bit(devno, bl_dev))
continue;
len += sprintf(page + len, "0.0.%04lx", devno);
if (test_bit(devno + 1, bl_dev)) { /* print range */
while (++devno < __MAX_SUBCHANNEL)
if (!test_bit(devno, bl_dev))
break;
len += sprintf(page + len, "-0.0.%04lx", --devno);
}
len += sprintf(page + len, "\n");
}
if (devno < __MAX_SUBCHANNEL)
*eof = 1;
*start = (char *) (devno - off); /* number of checked entries */
return len;
if (*offset > __MAX_SUBCHANNEL)
return NULL;
iter = kmalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
if (!iter)
return ERR_PTR(-ENOMEM);
memset(iter, 0, sizeof(struct ccwdev_iter));
iter->devno = *offset;
return iter;
}
static int cio_ignore_write(struct file *file, const char __user *user_buf,
unsigned long user_len, void *data)
static void
cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
{
if (!IS_ERR(it))
kfree(it);
}
static void *
cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
{
struct ccwdev_iter *iter;
if (*offset > __MAX_SUBCHANNEL)
return NULL;
iter = (struct ccwdev_iter *)it;
iter->devno++;
(*offset)++;
return iter;
}
static int
cio_ignore_proc_seq_show(struct seq_file *s, void *it)
{
struct ccwdev_iter *iter;
iter = (struct ccwdev_iter *)it;
if (!is_blacklisted(iter->devno))
/* Not blacklisted, nothing to output. */
return 0;
if (!iter->in_range) {
/* First device in range. */
if ((iter->devno == __MAX_SUBCHANNEL) ||
!is_blacklisted(iter->devno + 1))
/* Singular device. */
return seq_printf(s, "0.0.%04x\n", iter->devno);
iter->in_range = 1;
return seq_printf(s, "0.0.%04x-", iter->devno);
}
if ((iter->devno == __MAX_SUBCHANNEL) ||
!is_blacklisted(iter->devno + 1)) {
/* Last device in range. */
iter->in_range = 0;
return seq_printf(s, "0.0.%04x\n", iter->devno);
}
return 0;
}
static ssize_t
cio_ignore_write(struct file *file, const char __user *user_buf,
size_t user_len, loff_t *offset)
{
char *buf;
if (*offset)
return -EINVAL;
if (user_len > 65536)
user_len = 65536;
buf = vmalloc (user_len + 1); /* maybe better use the stack? */
@ -331,6 +373,27 @@ static int cio_ignore_write(struct file *file, const char __user *user_buf,
return user_len;
}
static struct seq_operations cio_ignore_proc_seq_ops = {
.start = cio_ignore_proc_seq_start,
.stop = cio_ignore_proc_seq_stop,
.next = cio_ignore_proc_seq_next,
.show = cio_ignore_proc_seq_show,
};
static int
cio_ignore_proc_open(struct inode *inode, struct file *file)
{
return seq_open(file, &cio_ignore_proc_seq_ops);
}
static struct file_operations cio_ignore_proc_fops = {
.open = cio_ignore_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
.write = cio_ignore_write,
};
static int
cio_ignore_proc_init (void)
{
@ -341,8 +404,7 @@ cio_ignore_proc_init (void)
if (!entry)
return 0;
entry->read_proc = cio_ignore_read;
entry->write_proc = cio_ignore_write;
entry->proc_fops = &cio_ignore_proc_fops;
return 1;
}