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| author | Kay Sievers <kay.sievers@vrfy.org> | 2008-08-16 14:30:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-08-21 10:15:38 -0700 |
| commit | 068281d302def5efd96d84a163ba17e85f5ea564 (patch) | |
| tree | f8d49d6c1e2043bcf3671504b411770a0c8c349c /block | |
| parent | f5a6d958b5d0a10e7e7a9dee1862fb31d08c6d26 (diff) | |
| download | lwn-068281d302def5efd96d84a163ba17e85f5ea564.tar.gz lwn-068281d302def5efd96d84a163ba17e85f5ea564.zip | |
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')
| -rw-r--r-- | block/genhd.c | 14 |
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; |