[PATCH] Simplify proc/devices and fix early termination regression
Make baby-simple the code for /proc/devices. Based on the proven design
for /proc/interrupts.
This also fixes the early-termination regression 2.6.16 introduced, as
demonstrated by:
# dd if=/proc/devices bs=1
Character devices:
1 mem
27+0 records in
27+0 records out
This should also work (but is untested) when /proc/devices >4096 bytes,
which I believe is what the original 2.6.16 rewrite fixed.
[akpm@osdl.org: cleanups, simplifications]
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/block/genhd.c b/block/genhd.c
index db4c60c..5a8d3bf 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -17,8 +17,6 @@
#include <linux/buffer_head.h>
#include <linux/mutex.h>
-#define MAX_PROBE_HASH 255 /* random */
-
static struct subsystem block_subsys;
static DEFINE_MUTEX(block_subsys_lock);
@@ -31,108 +29,29 @@
struct blk_major_name *next;
int major;
char name[16];
-} *major_names[MAX_PROBE_HASH];
+} *major_names[BLKDEV_MAJOR_HASH_SIZE];
/* index in the above - for now: assume no multimajor ranges */
static inline int major_to_index(int major)
{
- return major % MAX_PROBE_HASH;
+ return major % BLKDEV_MAJOR_HASH_SIZE;
}
-struct blkdev_info {
- int index;
- struct blk_major_name *bd;
-};
+#ifdef CONFIG_PROC_FS
-/*
- * iterate over a list of blkdev_info structures. allows
- * the major_names array to be iterated over from outside this file
- * must be called with the block_subsys_lock held
- */
-void *get_next_blkdev(void *dev)
+void blkdev_show(struct seq_file *f, off_t offset)
{
- struct blkdev_info *info;
+ struct blk_major_name *dp;
- if (dev == NULL) {
- info = kmalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
- goto out;
- info->index=0;
- info->bd = major_names[info->index];
- if (info->bd)
- goto out;
- } else {
- info = dev;
- }
-
- while (info->index < ARRAY_SIZE(major_names)) {
- if (info->bd)
- info->bd = info->bd->next;
- if (info->bd)
- goto out;
- /*
- * No devices on this chain, move to the next
- */
- info->index++;
- info->bd = (info->index < ARRAY_SIZE(major_names)) ?
- major_names[info->index] : NULL;
- if (info->bd)
- goto out;
- }
-
-out:
- return info;
-}
-
-void *acquire_blkdev_list(void)
-{
- mutex_lock(&block_subsys_lock);
- return get_next_blkdev(NULL);
-}
-
-void release_blkdev_list(void *dev)
-{
- mutex_unlock(&block_subsys_lock);
- kfree(dev);
-}
-
-
-/*
- * Count the number of records in the blkdev_list.
- * must be called with the block_subsys_lock held
- */
-int count_blkdev_list(void)
-{
- struct blk_major_name *n;
- int i, count;
-
- count = 0;
-
- for (i = 0; i < ARRAY_SIZE(major_names); i++) {
- for (n = major_names[i]; n; n = n->next)
- count++;
+ if (offset < BLKDEV_MAJOR_HASH_SIZE) {
+ mutex_lock(&block_subsys_lock);
+ for (dp = major_names[offset]; dp; dp = dp->next)
+ seq_printf(f, "%3d %s\n", dp->major, dp->name);
+ mutex_unlock(&block_subsys_lock);
}
-
- return count;
}
-/*
- * extract the major and name values from a blkdev_info struct
- * passed in as a void to *dev. Must be called with
- * block_subsys_lock held
- */
-int get_blkdev_info(void *dev, int *major, char **name)
-{
- struct blkdev_info *info = dev;
-
- if (info->bd == NULL)
- return 1;
-
- *major = info->bd->major;
- *name = info->bd->name;
- return 0;
-}
-
+#endif /* CONFIG_PROC_FS */
int register_blkdev(unsigned int major, const char *name)
{
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 4e1b849..f3418f7 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 @@
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;
+ return major % CHRDEV_MAJOR_HASH_SIZE;
}
-struct chrdev_info {
- int index;
- struct char_device_struct *cd;
-};
+#ifdef CONFIG_PROC_FS
-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);
-}
-
-
-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 ef5a3323..5c10ea1 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -249,155 +249,64 @@
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 void *devinfo_start(struct seq_file *f, loff_t *pos)
-{
- struct devinfo_state *info = f->private;
-
- if (*pos) {
- if ((info) && (*pos <= info->num_records))
- return info;
- return NULL;
- }
- 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;
-}
-
-static void *devinfo_next(struct seq_file *f, void *v, 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;
-}
-
-static void devinfo_stop(struct seq_file *f, void *v)
-{
- struct devinfo_state *info = f->private;
-
- if (info) {
- release_chrdev_list(info->chrdev);
- release_blkdev_list(info->blkdev);
- f->private = NULL;
- kfree(info);
- }
-}
-
-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 struct seq_operations devinfo_op = {
- .start = devinfo_start,
- .next = devinfo_next,
- .stop = devinfo_stop,
- .show = devinfo_show,
-};
-
-static int devinfo_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &devinfo_op);
-}
-
-static struct file_operations proc_devinfo_operations = {
- .open = devinfo_open,
+static struct file_operations proc_cpuinfo_operations = {
+ .open = cpuinfo_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
-static struct file_operations proc_cpuinfo_operations = {
- .open = cpuinfo_open,
+static int devinfo_show(struct seq_file *f, void *v)
+{
+ int i = *(loff_t *) v;
+
+ 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);
+ }
+ return 0;
+}
+
+static void *devinfo_start(struct seq_file *f, loff_t *pos)
+{
+ if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ return pos;
+ return NULL;
+}
+
+static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ (*pos)++;
+ if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+ return NULL;
+ return pos;
+}
+
+static void devinfo_stop(struct seq_file *f, void *v)
+{
+ /* Nothing to do */
+}
+
+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 *filp)
+{
+ return seq_open(filp, &devinfo_ops);
+}
+
+static struct file_operations proc_devinfo_operations = {
+ .open = devinfo_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 20fa5f6..20a7afd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1413,6 +1413,7 @@
#endif
/* fs/char_dev.c */
+#define CHRDEV_MAJOR_HASH_SIZE 255
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
extern int register_chrdev(unsigned int, const char *,
@@ -1420,25 +1421,17 @@
extern int unregister_chrdev(unsigned int, const char *);
extern void unregister_chrdev_region(dev_t, unsigned);
extern int chrdev_open(struct inode *, struct file *);
-extern int get_chrdev_list(char *);
-extern void *acquire_chrdev_list(void);
-extern int count_chrdev_list(void);
-extern void *get_next_chrdev(void *);
-extern int get_chrdev_info(void *, int *, char **);
-extern void release_chrdev_list(void *);
+extern void chrdev_show(struct seq_file *,off_t);
/* fs/block_dev.c */
+#define BLKDEV_MAJOR_HASH_SIZE 255
#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
extern struct block_device *open_bdev_excl(const char *, int, void *);
extern void close_bdev_excl(struct block_device *);
-extern void *acquire_blkdev_list(void);
-extern int count_blkdev_list(void);
-extern void *get_next_blkdev(void *);
-extern int get_blkdev_info(void *, int *, char **);
-extern void release_blkdev_list(void *);
+extern void blkdev_show(struct seq_file *,off_t);
extern void init_special_inode(struct inode *, umode_t, dev_t);
