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Subject[PATCH 1/8] 2.6.0-test2-bk8 - seq_file conversion of /proc/net/atm (devices)
seq_file conversion for proc/atm/devices:
- code inspired from seq_file use in net/core/dev.c;
- atm_dev_lock taken/released in atm_devices_seq_{start/stop};
- add a helper CREATE_SEQ_ENTRY() similar to CREATE_ENTRY() (both are removed
once conversion is done).

net/atm/proc.c | 111 ++++++++++++++++++++++++++++++++++++++++-----------------
1 files changed, 79 insertions(+), 32 deletions(-)
diff -puN net/atm/proc.c~atm-proc-seq-devices net/atm/proc.c
--- linux-2.6.0-test2-bk8/net/atm/proc.c~atm-proc-seq-devices Fri Aug 8 20:28:48 2003
+++ linux-2.6.0-test2-bk8-fr/net/atm/proc.c Fri Aug 8 20:28:48 2003
@@ -24,6 +24,7 @@
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include <linux/errno.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
@@ -64,32 +65,30 @@ static struct file_operations proc_spec_
.read = proc_spec_atm_read,
};

-static void add_stats(char *buf,const char *aal,
+static void add_stats(struct seq_file *seq, const char *aal,
const struct k_atm_aal_stats *stats)
{
- sprintf(strchr(buf,0),"%s ( %d %d %d %d %d )",aal,
+ seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
atomic_read(&stats->tx),atomic_read(&stats->tx_err),
atomic_read(&stats->rx),atomic_read(&stats->rx_err),
atomic_read(&stats->rx_drop));
}

-
-static void atm_dev_info(const struct atm_dev *dev,char *buf)
+static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
{
- int off,i;
+ int i;

- off = sprintf(buf,"%3d %-8s",dev->number,dev->type);
+ seq_printf(seq, "%3d %-8s", dev->number, dev->type);
for (i = 0; i < ESI_LEN; i++)
- off += sprintf(buf+off,"%02x",dev->esi[i]);
- strcat(buf," ");
- add_stats(buf,"0",&dev->stats.aal0);
- strcat(buf," ");
- add_stats(buf,"5",&dev->stats.aal5);
- sprintf(strchr(buf,0), "\t[%d]", atomic_read(&dev->refcnt));
- strcat(buf,"\n");
+ seq_printf(seq, "%02x", dev->esi[i]);
+ seq_puts(seq, " ");
+ add_stats(seq, "0", &dev->stats.aal0);
+ seq_puts(seq, " ");
+ add_stats(seq, "5", &dev->stats.aal5);
+ seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt));
+ seq_putc(seq, '\n');
}

-
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)


@@ -303,30 +302,70 @@ lec_info(struct lec_arp_table *entry, ch

#endif

-static int atm_devices_info(loff_t pos,char *buf)
+static __inline__ void *dev_get_idx(struct seq_file *seq, loff_t left)
{
- struct atm_dev *dev;
struct list_head *p;
- int left;

- if (!pos) {
- return sprintf(buf,"Itf Type ESI/\"MAC\"addr "
- "AAL(TX,err,RX,err,drop) ... [refcnt]\n");
- }
- left = pos-1;
- spin_lock(&atm_dev_lock);
list_for_each(p, &atm_devs) {
- dev = list_entry(p, struct atm_dev, dev_list);
- if (left-- == 0) {
- atm_dev_info(dev,buf);
- spin_unlock(&atm_dev_lock);
- return strlen(buf);
- }
+ if (!--left)
+ break;
}
- spin_unlock(&atm_dev_lock);
- return 0;
+ return (p != &atm_devs) ? p : NULL;
+}
+
+static void *atm_devices_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ spin_lock(&atm_dev_lock);
+ return *pos ? dev_get_idx(seq, *pos) : (void *) 1;
}

+static void atm_devices_seq_stop(struct seq_file *seq, void *v)
+{
+ spin_unlock(&atm_dev_lock);
+}
+
+static void *atm_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
+ return (v == &atm_devs) ? NULL : v;
+}
+
+static int atm_devices_seq_show(struct seq_file *seq, void *v)
+{
+ static char atm_devices_banner[] =
+ "Itf Type ESI/\"MAC\"addr "
+ "AAL(TX,err,RX,err,drop) ... [refcnt]\n";
+
+ if (v == (void *)1)
+ seq_puts(seq, atm_devices_banner);
+ else {
+ struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
+
+ atm_dev_info(seq, dev);
+ }
+ return 0;
+}
+
+static struct seq_operations atm_devices_seq_ops = {
+ .start = atm_devices_seq_start,
+ .next = atm_devices_seq_next,
+ .stop = atm_devices_seq_stop,
+ .show = atm_devices_seq_show,
+};
+
+static int atm_devices_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &atm_devices_seq_ops);
+}
+
+static struct file_operations atm_seq_devices_fops = {
+ .open = atm_devices_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
/*
* FIXME: it isn't safe to walk the VCC list without turning off interrupts.
* What is really needed is some lock on the devices. Ditto for ATMARP.
@@ -623,6 +662,14 @@ void atm_proc_dev_deregister(struct atm_
kfree(dev->proc_name);
}

+#define CREATE_SEQ_ENTRY(name) \
+ do { \
+ name = create_proc_entry(#name, S_IRUGO, atm_proc_root); \
+ if (!name) \
+ goto cleanup; \
+ name->proc_fops = &atm_seq_##name##_fops; \
+ name->owner = THIS_MODULE; \
+ } while (0)

#define CREATE_ENTRY(name) \
name = create_proc_entry(#name,0,atm_proc_root); \
@@ -656,7 +703,7 @@ int __init atm_proc_init(void)
atm_proc_root = proc_mkdir("net/atm",NULL);
if (!atm_proc_root)
return -ENOMEM;
- CREATE_ENTRY(devices);
+ CREATE_SEQ_ENTRY(devices);
CREATE_ENTRY(pvc);
CREATE_ENTRY(svc);
CREATE_ENTRY(vc);
_
-
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