[SCSI] iterate over devices individually for /proc/scsi/scsi

On systems with very large numbers (> 1600 or so) of SCSI devices,
cat /proc/scsi/scsi ends up failing with -ENOMEM. This is due to
the show routine simply iterating over all of the devices with
bus_for_each_dev(), and trying to dump all of them into the buffer
at the same time. On my test system (using scsi_debug with 4064 devices),
the output ends up being ~ 632k, far more than kmalloc will typically allow.

This patch defines its own seq_file opreations to iterate over the scsi
devices.The result is that each show() operation only dumps ~ 180 bytes
into the buffer at a time so we don't run out of memory.

If the "Attached devices" header isn't required, we can dump the
sfile->private bit completely.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 52 insertions, 6 deletions

diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index c99da926fdac..f46855cd853d 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -386,13 +386,59 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
  * @s: output goes here
  * @p: not used
  */
-static int proc_scsi_show(struct seq_file *s, void *p)
+static int always_match(struct device *dev, void *data)
 {
-        seq_printf(s, "Attached devices:\n");
-        bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
-        return 0;
+        return 1;
+}
+
+static inline struct device *next_scsi_device(struct device *start)
+{
+        struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
+                                              always_match);
+        put_device(start);
+        return next;
 }
 
+static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos)
+{
+        struct device *dev = NULL;
+        loff_t n = *pos;
+
+        while ((dev = next_scsi_device(dev))) {
+                if (!n--)
+                        break;
+                sfile->private++;
+        }
+        return dev;
+}
+
+static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos)
+{
+        (*pos)++;
+        sfile->private++;
+        return next_scsi_device(v);
+}
+
+static void scsi_seq_stop(struct seq_file *sfile, void *v)
+{
+        put_device(v);
+}
+
+static int scsi_seq_show(struct seq_file *sfile, void *dev)
+{
+        if (!sfile->private)
+                seq_puts(sfile, "Attached devices:\n");
+
+        return proc_print_scsidevice(dev, sfile);
+}
+
+static const struct seq_operations scsi_seq_ops = {
+        .start  = scsi_seq_start,
+        .next   = scsi_seq_next,
+        .stop   = scsi_seq_stop,
+        .show   = scsi_seq_show
+};
+
 /**
  * proc_scsi_open - glue function
  * @inode: not used
@@ -406,7 +452,7 @@ static int proc_scsi_open(struct inode *inode, struct file *file)
          * We don't really need this for the write case but it doesn't
          * harm either.
          */
-        return single_open(file, proc_scsi_show, NULL);
+        return seq_open(file, &scsi_seq_ops);
 }
 
 static const struct file_operations proc_scsi_operations = {
@@ -415,7 +461,7 @@ static const struct file_operations proc_scsi_operations = {
         .read           = seq_read,
         .write          = proc_scsi_write,
         .llseek         = seq_lseek,
-        .release        = single_release,
+        .release        = seq_release,
 };
 
 /**