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Date: Thu, 14 Oct 2021 00:35:52 +0900
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
To: Qing Wang <wangqing@...o.com>
Cc: linux-nilfs <linux-nilfs@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nilfs2: replace snprintf in show functions with sysfs_emit
On Wed, Oct 13, 2021 at 12:29 PM Qing Wang <wangqing@...o.com> 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@...o.com>
Thank you for the patch.
Looks good to me. Will apply.
Ryusuke Konishi
> ---
> fs/nilfs2/sysfs.c | 76 +++++++++++++++++++++++++++----------------------------
> 1 file changed, 38 insertions(+), 38 deletions(-)
>
> diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
> index 68e8d61..cdb935f 100644
> --- a/fs/nilfs2/sysfs.c
> +++ b/fs/nilfs2/sysfs.c
> @@ -97,7 +97,7 @@ static ssize_t
> nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
> struct nilfs_root *root, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)atomic64_read(&root->inodes_count));
> }
>
> @@ -105,7 +105,7 @@ static ssize_t
> nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
> struct nilfs_root *root, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)atomic64_read(&root->blocks_count));
> }
>
> @@ -118,7 +118,7 @@ static ssize_t
> nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
> struct nilfs_root *root, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
> + return sysfs_emit(buf, snapshot_readme_str);
> }
>
> NILFS_SNAPSHOT_RO_ATTR(inodes_count);
> @@ -219,7 +219,7 @@ static ssize_t
> nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
> struct the_nilfs *nilfs, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
> + return sysfs_emit(buf, mounted_snapshots_readme_str);
> }
>
> NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
> @@ -257,7 +257,7 @@ nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
>
> ncheckpoints = cpstat.cs_ncps;
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
> + return sysfs_emit(buf, "%llu\n", ncheckpoints);
> }
>
> static ssize_t
> @@ -280,7 +280,7 @@ nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
>
> nsnapshots = cpstat.cs_nsss;
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
> + return sysfs_emit(buf, "%llu\n", nsnapshots);
> }
>
> static ssize_t
> @@ -294,7 +294,7 @@ nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
> last_cno = nilfs->ns_last_cno;
> spin_unlock(&nilfs->ns_last_segment_lock);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
> + return sysfs_emit(buf, "%llu\n", last_cno);
> }
>
> static ssize_t
> @@ -308,7 +308,7 @@ nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
> cno = nilfs->ns_cno;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
> + return sysfs_emit(buf, "%llu\n", cno);
> }
>
> static const char checkpoints_readme_str[] =
> @@ -324,7 +324,7 @@ static ssize_t
> nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
> struct the_nilfs *nilfs, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
> + return sysfs_emit(buf, checkpoints_readme_str);
> }
>
> NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
> @@ -355,7 +355,7 @@ nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
> struct the_nilfs *nilfs,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
> + return sysfs_emit(buf, "%lu\n", nilfs->ns_nsegments);
> }
>
> static ssize_t
> @@ -363,7 +363,7 @@ nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
> struct the_nilfs *nilfs,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
> + return sysfs_emit(buf, "%lu\n", nilfs->ns_blocks_per_segment);
> }
>
> static ssize_t
> @@ -377,7 +377,7 @@ nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
> ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
> up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
> + return sysfs_emit(buf, "%lu\n", ncleansegs);
> }
>
> static ssize_t
> @@ -397,7 +397,7 @@ nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
> return err;
> }
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
> + return sysfs_emit(buf, "%llu\n", sustat.ss_ndirtysegs);
> }
>
> static const char segments_readme_str[] =
> @@ -413,7 +413,7 @@ nilfs_segments_README_show(struct nilfs_segments_attr *attr,
> struct the_nilfs *nilfs,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, segments_readme_str);
> + return sysfs_emit(buf, segments_readme_str);
> }
>
> NILFS_SEGMENTS_RO_ATTR(segments_number);
> @@ -450,7 +450,7 @@ nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
> last_pseg = nilfs->ns_last_pseg;
> spin_unlock(&nilfs->ns_last_segment_lock);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)last_pseg);
> }
>
> @@ -465,7 +465,7 @@ nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
> last_seq = nilfs->ns_last_seq;
> spin_unlock(&nilfs->ns_last_segment_lock);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
> + return sysfs_emit(buf, "%llu\n", last_seq);
> }
>
> static ssize_t
> @@ -479,7 +479,7 @@ nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_attr *attr,
> last_cno = nilfs->ns_last_cno;
> spin_unlock(&nilfs->ns_last_segment_lock);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
> + return sysfs_emit(buf, "%llu\n", last_cno);
> }
>
> static ssize_t
> @@ -493,7 +493,7 @@ nilfs_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
> seg_seq = nilfs->ns_seg_seq;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
> + return sysfs_emit(buf, "%llu\n", seg_seq);
> }
>
> static ssize_t
> @@ -507,7 +507,7 @@ nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
> segnum = nilfs->ns_segnum;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
> + return sysfs_emit(buf, "%llu\n", segnum);
> }
>
> static ssize_t
> @@ -521,7 +521,7 @@ nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
> nextnum = nilfs->ns_nextnum;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
> + return sysfs_emit(buf, "%llu\n", nextnum);
> }
>
> static ssize_t
> @@ -535,7 +535,7 @@ nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
> pseg_offset = nilfs->ns_pseg_offset;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
> + return sysfs_emit(buf, "%lu\n", pseg_offset);
> }
>
> static ssize_t
> @@ -549,7 +549,7 @@ nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_attr *attr,
> cno = nilfs->ns_cno;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
> + return sysfs_emit(buf, "%llu\n", cno);
> }
>
> static ssize_t
> @@ -577,7 +577,7 @@ nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
> ctime = nilfs->ns_ctime;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", ctime);
> + return sysfs_emit(buf, "%llu\n", ctime);
> }
>
> static ssize_t
> @@ -605,7 +605,7 @@ nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
> nongc_ctime = nilfs->ns_nongc_ctime;
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", nongc_ctime);
> + return sysfs_emit(buf, "%llu\n", nongc_ctime);
> }
>
> static ssize_t
> @@ -619,7 +619,7 @@ nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
> ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
> up_read(&nilfs->ns_segctor_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
> + return sysfs_emit(buf, "%u\n", ndirtyblks);
> }
>
> static const char segctor_readme_str[] =
> @@ -656,7 +656,7 @@ static ssize_t
> nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
> struct the_nilfs *nilfs, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, segctor_readme_str);
> + return sysfs_emit(buf, segctor_readme_str);
> }
>
> NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
> @@ -725,7 +725,7 @@ nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
> sbwtime = nilfs->ns_sbwtime;
> up_read(&nilfs->ns_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", sbwtime);
> + return sysfs_emit(buf, "%llu\n", sbwtime);
> }
>
> static ssize_t
> @@ -739,7 +739,7 @@ nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
> sbwcount = nilfs->ns_sbwcount;
> up_read(&nilfs->ns_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
> + return sysfs_emit(buf, "%u\n", sbwcount);
> }
>
> static ssize_t
> @@ -753,7 +753,7 @@ nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
> sb_update_freq = nilfs->ns_sb_update_freq;
> up_read(&nilfs->ns_sem);
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
> + return sysfs_emit(buf, "%u\n", sb_update_freq);
> }
>
> static ssize_t
> @@ -801,7 +801,7 @@ static ssize_t
> nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
> struct the_nilfs *nilfs, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, sb_readme_str);
> + return sysfs_emit(buf, sb_readme_str);
> }
>
> NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
> @@ -836,7 +836,7 @@ ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
> u32 major = le32_to_cpu(sbp[0]->s_rev_level);
> u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
>
> - return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
> + return sysfs_emit(buf, "%d.%d\n", major, minor);
> }
>
> static
> @@ -844,7 +844,7 @@ ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
> struct the_nilfs *nilfs,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
> + return sysfs_emit(buf, "%u\n", nilfs->ns_blocksize);
> }
>
> static
> @@ -855,7 +855,7 @@ ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
> struct nilfs_super_block **sbp = nilfs->ns_sbp;
> u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
>
> - return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
> + return sysfs_emit(buf, "%llu\n", dev_size);
> }
>
> static
> @@ -866,7 +866,7 @@ ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
> sector_t free_blocks = 0;
>
> nilfs_count_free_blocks(nilfs, &free_blocks);
> - return snprintf(buf, PAGE_SIZE, "%llu\n",
> + return sysfs_emit(buf, "%llu\n",
> (unsigned long long)free_blocks);
> }
>
> @@ -877,7 +877,7 @@ ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
> {
> struct nilfs_super_block **sbp = nilfs->ns_sbp;
>
> - return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
> + return sysfs_emit(buf, "%pUb\n", sbp[0]->s_uuid);
> }
>
> static
> @@ -905,7 +905,7 @@ static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
> struct the_nilfs *nilfs,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, dev_readme_str);
> + return sysfs_emit(buf, dev_readme_str);
> }
>
> NILFS_DEV_RO_ATTR(revision);
> @@ -1051,7 +1051,7 @@ void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
> static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
> struct attribute *attr, char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, "%d.%d\n",
> + return sysfs_emit(buf, "%d.%d\n",
> NILFS_CURRENT_REV, NILFS_MINOR_REV);
> }
>
> @@ -1064,7 +1064,7 @@ static ssize_t nilfs_feature_README_show(struct kobject *kobj,
> struct attribute *attr,
> char *buf)
> {
> - return snprintf(buf, PAGE_SIZE, features_readme_str);
> + return sysfs_emit(buf, features_readme_str);
> }
>
> NILFS_FEATURE_RO_ATTR(revision);
> --
> 2.7.4
>
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