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SubjectRe: [PATCH] ext4: replace snprintf in show functions with sysfs_emit
On Tue 12-10-21 20:28:51, Qing Wang wrote:
> coccicheck complains about the use of snprintf() in sysfs show functions.
>
> Fix the coccicheck warning:
> WARNING: use scnprintf or sprintf.
>
> Use sysfs_emit instead of scnprintf or sprintf makes more sense.
>
> Signed-off-by: Qing Wang <wangqing@vivo.com>

Makes sense. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza


> ---
> fs/ext4/sysfs.c | 34 +++++++++++++++++-----------------
> 1 file changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
> index 2314f74..2a4ae3d 100644
> --- a/fs/ext4/sysfs.c
> +++ b/fs/ext4/sysfs.c
> @@ -63,7 +63,7 @@ static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
> {
> struct super_block *sb = sbi->s_buddy_cache->i_sb;
>
> - return snprintf(buf, PAGE_SIZE, "%lu\n",
> + return sysfs_emit(buf, "%lu\n",
> (part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
> sbi->s_sectors_written_start) >> 1);
> }
> @@ -72,7 +72,7 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
> {
> struct super_block *sb = sbi->s_buddy_cache->i_sb;
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)(sbi->s_kbytes_written +
> ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
> EXT4_SB(sb)->s_sectors_written_start) >> 1)));
> @@ -130,8 +130,8 @@ static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
> static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
> {
> if (!sbi->s_journal)
> - return snprintf(buf, PAGE_SIZE, "<none>\n");
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "<none>\n");
> + return sysfs_emit(buf, "%d\n",
> task_pid_vnr(sbi->s_journal->j_task));
> }
>
> @@ -357,7 +357,7 @@ static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
>
> static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
> {
> - return snprintf(buf, PAGE_SIZE, "%lld\n",
> + return sysfs_emit(buf, "%lld\n",
> ((time64_t)hi << 32) + le32_to_cpu(lo));
> }
>
> @@ -374,7 +374,7 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
>
> switch (a->attr_id) {
> case attr_delayed_allocation_blocks:
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (s64) EXT4_C2B(sbi,
> percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
> case attr_session_write_kbytes:
> @@ -382,11 +382,11 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
> case attr_lifetime_write_kbytes:
> return lifetime_write_kbytes_show(sbi, buf);
> case attr_reserved_clusters:
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)
> atomic64_read(&sbi->s_resv_clusters));
> case attr_sra_exceeded_retry_limit:
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)
> percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
> case attr_inode_readahead:
> @@ -394,42 +394,42 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
> if (!ptr)
> return 0;
> if (a->attr_ptr == ptr_ext4_super_block_offset)
> - return snprintf(buf, PAGE_SIZE, "%u\n",
> + return sysfs_emit(buf, "%u\n",
> le32_to_cpup(ptr));
> else
> - return snprintf(buf, PAGE_SIZE, "%u\n",
> + return sysfs_emit(buf, "%u\n",
> *((unsigned int *) ptr));
> case attr_pointer_ul:
> if (!ptr)
> return 0;
> - return snprintf(buf, PAGE_SIZE, "%lu\n",
> + return sysfs_emit(buf, "%lu\n",
> *((unsigned long *) ptr));
> case attr_pointer_u8:
> if (!ptr)
> return 0;
> - return snprintf(buf, PAGE_SIZE, "%u\n",
> + return sysfs_emit(buf, "%u\n",
> *((unsigned char *) ptr));
> case attr_pointer_u64:
> if (!ptr)
> return 0;
> if (a->attr_ptr == ptr_ext4_super_block_offset)
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> le64_to_cpup(ptr));
> else
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> *((unsigned long long *) ptr));
> case attr_pointer_string:
> if (!ptr)
> return 0;
> - return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
> + return sysfs_emit(buf, "%.*s\n", a->attr_size,
> (char *) ptr);
> case attr_pointer_atomic:
> if (!ptr)
> return 0;
> - return snprintf(buf, PAGE_SIZE, "%d\n",
> + return sysfs_emit(buf, "%d\n",
> atomic_read((atomic_t *) ptr));
> case attr_feature:
> - return snprintf(buf, PAGE_SIZE, "supported\n");
> + return sysfs_emit(buf, "supported\n");
> case attr_first_error_time:
> return print_tstamp(buf, sbi->s_es, s_first_error_time);
> case attr_last_error_time:
> --
> 2.7.4
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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