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zram: use scnprintf() in attrs show() methods

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sysfs.txt documentation lists the following requirements:

 - The buffer will always be PAGE_SIZE bytes in length. On i386, this
   is 4096.

 - show() methods should return the number of bytes printed into the
   buffer. This is the return value of scnprintf().

 - show() should always use scnprintf().

Use scnprintf() in show() functions.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2014-04-07 15:38:22 -07:00 committed by Linus Torvalds
parent 60a726e333
commit 56b4e8cb85
2 changed files with 11 additions and 9 deletions
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8
drivers/block/zram/zcomp.c
View File

@ -275,12 +275,14 @@ ssize_t zcomp_available_show(const char *comp, char *buf)
while (backends[i]) {
if (sysfs_streq(comp, backends[i]->name))
sz += sprintf(buf + sz, "[%s] ", backends[i]->name);
sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
"[%s] ", backends[i]->name);
else
sz += sprintf(buf + sz, "%s ", backends[i]->name);
sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,
"%s ", backends[i]->name);
i++;
}
sz += sprintf(buf + sz, "\n");
sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");
return sz;
}

12
drivers/block/zram/zram_drv.c
View File

@ -48,7 +48,7 @@ static ssize_t zram_attr_##name##_show(struct device *d, \
struct device_attribute *attr, char *b) \
{ \
struct zram *zram = dev_to_zram(d); \
return sprintf(b, "%llu\n", \
return scnprintf(b, PAGE_SIZE, "%llu\n", \
(u64)atomic64_read(&zram->stats.name)); \
} \
static struct device_attribute dev_attr_##name = \
@ -69,7 +69,7 @@ static ssize_t disksize_show(struct device *dev,
{
struct zram *zram = dev_to_zram(dev);
return sprintf(buf, "%llu\n", zram->disksize);
return scnprintf(buf, PAGE_SIZE, "%llu\n", zram->disksize);
}
static ssize_t initstate_show(struct device *dev,
@ -82,7 +82,7 @@ static ssize_t initstate_show(struct device *dev,
val = init_done(zram);
up_read(&zram->init_lock);
return sprintf(buf, "%u\n", val);
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t orig_data_size_show(struct device *dev,
@ -90,7 +90,7 @@ static ssize_t orig_data_size_show(struct device *dev,
{
struct zram *zram = dev_to_zram(dev);
return sprintf(buf, "%llu\n",
return scnprintf(buf, PAGE_SIZE, "%llu\n",
(u64)(atomic64_read(&zram->stats.pages_stored)) << PAGE_SHIFT);
}
@ -106,7 +106,7 @@ static ssize_t mem_used_total_show(struct device *dev,
val = zs_get_total_size_bytes(meta->mem_pool);
up_read(&zram->init_lock);
return sprintf(buf, "%llu\n", val);
return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
}
static ssize_t max_comp_streams_show(struct device *dev,
@ -119,7 +119,7 @@ static ssize_t max_comp_streams_show(struct device *dev,
val = zram->max_comp_streams;
up_read(&zram->init_lock);
return sprintf(buf, "%d\n", val);
return scnprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t max_comp_streams_store(struct device *dev,