From: Cornelia Huck <[email protected]>
[patch 15/17] s390: convert /proc/cio_ignore.
Convert /proc/cio_ignore to a sequential file. This makes multiple
subchannel sets support easier.
Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
---
drivers/s390/cio/blacklist.c | 124 ++++++++++++++++++++++++++++++++-----------
1 files changed, 93 insertions(+), 31 deletions(-)
diff -urpN linux-2.6/drivers/s390/cio/blacklist.c linux-2.6-patched/drivers/s390/cio/blacklist.c
--- linux-2.6/drivers/s390/cio/blacklist.c 2005-12-09 14:26:02.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/blacklist.c 2005-12-09 14:26:04.000000000 +0100
@@ -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 *b
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)
-{
- const unsigned int entry_size = 18; /* "0.0.ABCD-0.0.EFGH\n" */
- long devno;
- int len;
-
- 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");
- }
+/* 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)
+{
+ struct ccwdev_iter *iter;
+
+ 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 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;
+}
- if (devno < __MAX_SUBCHANNEL)
- *eof = 1;
- *start = (char *) (devno - off); /* number of checked entries */
- return len;
+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 int cio_ignore_write(struct file *file, const char __user *user_buf,
- unsigned long user_len, void *data)
+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
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;
}
-
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