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authorKay Sievers <kay.sievers@vrfy.org>2008-08-16 16:30:30 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-08-21 21:15:38 +0400
commit068281d302def5efd96d84a163ba17e85f5ea564 (patch)
treef8d49d6c1e2043bcf3671504b411770a0c8c349c /block/genhd.c
parentf5a6d958b5d0a10e7e7a9dee1862fb31d08c6d26 (diff)
downloadlinux-068281d302def5efd96d84a163ba17e85f5ea564.tar.xz
block: fix partial read() of /proc/{partitions,diskstats}
The proc files get truncated if they do not fit into the buffer with a single read(). We need to move the seq_file index from the callback of class_find_device() to the caller of class_find_device(), to keep its value across multiple invocations of the callback. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/block/genhd.c b/block/genhd.c
index c13cc77291af..f34befc54847 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -293,25 +293,26 @@ void __init printk_all_partitions(void)
/* iterator */
static int find_start(struct device *dev, void *data)
{
- loff_t k = *(loff_t *)data;
+ loff_t *k = data;
if (dev->type != &disk_type)
return 0;
- if (!k--)
+ if (!*k)
return 1;
+ (*k)--;
return 0;
}
static void *part_start(struct seq_file *part, loff_t *pos)
{
struct device *dev;
- loff_t n = *pos;
+ loff_t k = *pos;
- if (!n)
+ if (!k)
seq_puts(part, "major minor #blocks name\n\n");
mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, (void *)pos, find_start);
+ dev = class_find_device(&block_class, NULL, &k, find_start);
if (dev)
return dev_to_disk(dev);
return NULL;
@@ -568,9 +569,10 @@ static struct device_type disk_type = {
static void *diskstats_start(struct seq_file *part, loff_t *pos)
{
struct device *dev;
+ loff_t k = *pos;
mutex_lock(&block_class_lock);
- dev = class_find_device(&block_class, NULL, (void *)pos, find_start);
+ dev = class_find_device(&block_class, NULL, &k, find_start);
if (dev)
return dev_to_disk(dev);
return NULL;