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authorNeil Horman <nhorman@redhat.com>2006-01-14 13:20:38 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-14 18:25:19 -0800
commit7170be5f586b59bdcdab082778a5d9203ba7b667 (patch)
tree00d34a062c5bbab83315232078296567037bd3f4 /fs/char_dev.c
parentfaf3a98918aa5f14a29e0d246e194be58b9357f0 (diff)
downloadlinux-7170be5f586b59bdcdab082778a5d9203ba7b667.tar.gz
[PATCH] convert /proc/devices to use seq_file interface
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>
Diffstat (limited to 'fs/char_dev.c')
-rw-r--r--fs/char_dev.c96
1 files changed, 73 insertions, 23 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 3b1b1eefdbb..21195c48163 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -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;
- int i, len;
+};
- len = sprintf(page, "Character devices:\n");
+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, count;
+
+ count = 0;
+
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);