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[PATCH] convert /proc/devices to use seq_file interface

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A Christoph suggested that the /proc/devices file be converted to use the
seq_file interface.  This patch does that.

I've obxerved one or two installation that had sufficiently large sans that
they overran the 4k limit on /proc/devices.

Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Neil Horman
2006-01-14 13:20:38 -08:00
committed by Linus Torvalds
parent faf3a98918
commit 7170be5f58
4 changed files with 320 additions and 53 deletions
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96
fs/char_dev.c
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@@ -35,7 +35,7 @@ static struct char_device_struct {
unsigned int major;
unsigned int baseminor;
int minorct;
const char *name;
char name[64];
struct file_operations *fops;
struct cdev *cdev; /* will die */
} *chrdevs[MAX_PROBE_HASH];
@@ -46,34 +46,84 @@ static inline int major_to_index(int major)
return major % MAX_PROBE_HASH;
}
/* get char device names in somewhat random order */
int get_chrdev_list(char *page)
struct chrdev_info {
int index;
struct char_device_struct *cd;
};
void *get_next_chrdev(void *dev)
{
struct chrdev_info *info;
if (dev == NULL) {
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
goto out;
info->index=0;
info->cd = chrdevs[info->index];
if (info->cd)
goto out;
} else {
info = dev;
}
while (info->index < ARRAY_SIZE(chrdevs)) {
if (info->cd)
info->cd = info->cd->next;
if (info->cd)
goto out;
/*
* No devices on this chain, move to the next
*/
info->index++;
info->cd = (info->index < ARRAY_SIZE(chrdevs)) ?
chrdevs[info->index] : NULL;
if (info->cd)
goto out;
}
out:
return info;
}
void *acquire_chrdev_list(void)
{
down(&chrdevs_lock);
return get_next_chrdev(NULL);
}
void release_chrdev_list(void *dev)
{
up(&chrdevs_lock);
kfree(dev);
}
int count_chrdev_list(void)
{
struct char_device_struct *cd;
int i, len;
int i, count;
len = sprintf(page, "Character devices:\n");
count = 0;
down(&chrdevs_lock);
for (i = 0; i < ARRAY_SIZE(chrdevs) ; i++) {
for (cd = chrdevs[i]; cd; cd = cd->next) {
/*
* if the current name, plus the 5 extra characters
* in the device line for this entry
* would run us off the page, we're done
*/
if ((len+strlen(cd->name) + 5) >= PAGE_SIZE)
goto page_full;
len += sprintf(page+len, "%3d %s\n",
cd->major, cd->name);
}
for (cd = chrdevs[i]; cd; cd = cd->next)
count++;
}
page_full:
up(&chrdevs_lock);
return len;
return count;
}
int get_chrdev_info(void *dev, int *major, char **name)
{
struct chrdev_info *info = dev;
if (info->cd == NULL)
return 1;
*major = info->cd->major;
*name = info->cd->name;
return 0;
}
/*
@@ -121,7 +171,7 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
cd->major = major;
cd->baseminor = baseminor;
cd->minorct = minorct;
cd->name = name;
strncpy(cd->name,name, 64);
i = major_to_index(major);