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-rw-r--r--fs/char_dev.c87
-rw-r--r--fs/proc/proc_misc.c163
2 files changed, 47 insertions, 203 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 4e1b849f912f..f3418f7a6e9d 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>
+#include <linux/seq_file.h>
#include <linux/kobject.h>
#include <linux/kobj_map.h>
@@ -27,8 +28,6 @@
static struct kobj_map *cdev_map;
-#define MAX_PROBE_HASH 255 /* random */
-
static DEFINE_MUTEX(chrdevs_lock);
static struct char_device_struct {
@@ -39,93 +38,29 @@ static struct char_device_struct {
char name[64];
struct file_operations *fops;
struct cdev *cdev; /* will die */
-} *chrdevs[MAX_PROBE_HASH];
+} *chrdevs[CHRDEV_MAJOR_HASH_SIZE];
/* index in the above */
static inline int major_to_index(int major)
{
- return major % MAX_PROBE_HASH;
-}
-
-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)
-{
- mutex_lock(&chrdevs_lock);
- return get_next_chrdev(NULL);
-}
-
-void release_chrdev_list(void *dev)
-{
- mutex_unlock(&chrdevs_lock);
- kfree(dev);
+ return major % CHRDEV_MAJOR_HASH_SIZE;
}
+#ifdef CONFIG_PROC_FS
-int count_chrdev_list(void)
+void chrdev_show(struct seq_file *f, off_t offset)
{
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)
- count++;
+ if (offset < CHRDEV_MAJOR_HASH_SIZE) {
+ mutex_lock(&chrdevs_lock);
+ for (cd = chrdevs[offset]; cd; cd = cd->next)
+ seq_printf(f, "%3d %s\n", cd->major, cd->name);
+ mutex_unlock(&chrdevs_lock);
}
-
- 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;
-}
+#endif /* CONFIG_PROC_FS */
/*
* Register a single major with a specified minor range.
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index ef5a3323f4b5..5c10ea157425 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -249,144 +249,60 @@ static int cpuinfo_open(struct inode *inode, struct file *file)
return seq_open(file, &cpuinfo_op);
}
-enum devinfo_states {
- CHR_HDR,
- CHR_LIST,
- BLK_HDR,
- BLK_LIST,
- DEVINFO_DONE
-};
-
-struct devinfo_state {
- void *chrdev;
- void *blkdev;
- unsigned int num_records;
- unsigned int cur_record;
- enum devinfo_states state;
+static struct file_operations proc_cpuinfo_operations = {
+ .open = cpuinfo_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
};
-static void *devinfo_start(struct seq_file *f, loff_t *pos)
+static int devinfo_show(struct seq_file *f, void *v)
{
- struct devinfo_state *info = f->private;
+ int i = *(loff_t *) v;
- if (*pos) {
- if ((info) && (*pos <= info->num_records))
- return info;
- return NULL;
+ if (i < CHRDEV_MAJOR_HASH_SIZE) {
+ if (i == 0)
+ seq_printf(f, "Character devices:\n");
+ chrdev_show(f, i);
+ } else {
+ i -= CHRDEV_MAJOR_HASH_SIZE;
+ if (i == 0)
+ seq_printf(f, "\nBlock devices:\n");
+ blkdev_show(f, i);
}
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- f->private = info;
- info->chrdev = acquire_chrdev_list();
- info->blkdev = acquire_blkdev_list();
- info->state = CHR_HDR;
- info->num_records = count_chrdev_list();
- info->num_records += count_blkdev_list();
- info->num_records += 2; /* Character and Block headers */
- *pos = 1;
- info->cur_record = *pos;
- return info;
+ return 0;
}
-static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
+static void *devinfo_start(struct seq_file *f, loff_t *pos)
{
- int idummy;
- char *ndummy;
- struct devinfo_state *info = f->private;
-
- switch (info->state) {
- case CHR_HDR:
- info->state = CHR_LIST;
- (*pos)++;
- /*fallthrough*/
- case CHR_LIST:
- if (get_chrdev_info(info->chrdev,&idummy,&ndummy)) {
- /*
- * The character dev list is complete
- */
- info->state = BLK_HDR;
- } else {
- info->chrdev = get_next_chrdev(info->chrdev);
- }
- (*pos)++;
- break;
- case BLK_HDR:
- info->state = BLK_LIST;
- (*pos)++;
- /*fallthrough*/
- case BLK_LIST:
- if (get_blkdev_info(info->blkdev,&idummy,&ndummy)) {
- /*
- * The block dev list is complete
- */
- info->state = DEVINFO_DONE;
- } else {
- info->blkdev = get_next_blkdev(info->blkdev);
- }
- (*pos)++;
- break;
- case DEVINFO_DONE:
- (*pos)++;
- info->cur_record = *pos;
- info = NULL;
- break;
- default:
- break;
- }
- if (info)
- info->cur_record = *pos;
- return info;
+ if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ return pos;
+ return NULL;
}
-static void devinfo_stop(struct seq_file *f, void *v)
+static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
{
- struct devinfo_state *info = f->private;
-
- if (info) {
- release_chrdev_list(info->chrdev);
- release_blkdev_list(info->blkdev);
- f->private = NULL;
- kfree(info);
- }
+ (*pos)++;
+ if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ return NULL;
+ return pos;
}
-static int devinfo_show(struct seq_file *f, void *arg)
-{
- int major;
- char *name;
- struct devinfo_state *info = f->private;
-
- switch(info->state) {
- case CHR_HDR:
- seq_printf(f,"Character devices:\n");
- /* fallthrough */
- case CHR_LIST:
- if (!get_chrdev_info(info->chrdev,&major,&name))
- seq_printf(f,"%3d %s\n",major,name);
- break;
- case BLK_HDR:
- seq_printf(f,"\nBlock devices:\n");
- /* fallthrough */
- case BLK_LIST:
- if (!get_blkdev_info(info->blkdev,&major,&name))
- seq_printf(f,"%3d %s\n",major,name);
- break;
- default:
- break;
- }
-
- return 0;
+static void devinfo_stop(struct seq_file *f, void *v)
+{
+ /* Nothing to do */
}
-static struct seq_operations devinfo_op = {
- .start = devinfo_start,
- .next = devinfo_next,
- .stop = devinfo_stop,
- .show = devinfo_show,
+static struct seq_operations devinfo_ops = {
+ .start = devinfo_start,
+ .next = devinfo_next,
+ .stop = devinfo_stop,
+ .show = devinfo_show
};
-static int devinfo_open(struct inode *inode, struct file *file)
+static int devinfo_open(struct inode *inode, struct file *filp)
{
- return seq_open(file, &devinfo_op);
+ return seq_open(filp, &devinfo_ops);
}
static struct file_operations proc_devinfo_operations = {
@@ -396,13 +312,6 @@ static struct file_operations proc_devinfo_operations = {
.release = seq_release,
};
-static struct file_operations proc_cpuinfo_operations = {
- .open = cpuinfo_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
extern struct seq_operations vmstat_op;
static int vmstat_open(struct inode *inode, struct file *file)
{
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 20:39:17 +0000