nilfs2: replace snprintf in show functions with sysfs_emit

[ Upstream commit 3bcd6c5bd483287f4a09d3d59a012d47677b6edc ]

Patch series "nilfs2 updates".

This patch (of 2):

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.

Link: https://lkml.kernel.org/r/1635151862-11547-1-git-send-email-konishi.ryusuke@gmail.com
Link: https://lkml.kernel.org/r/1634095759-4625-1-git-send-email-wangqing@vivo.com
Link: https://lkml.kernel.org/r/1635151862-11547-2-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Qing Wang <wangqing@vivo.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Stable-dep-of: 683408258917 ("nilfs2: protect references to superblock parameters exposed in sysfs")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 57afd06db62de020b4aaeb6980c21701047a7e2c..63ab8f9e6db3b3f22c5a0f68dc7fcff942e8d240 100644 (file)
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -108,7 +108,7 @@ 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));
 }
 
@@ -116,7 +116,7 @@ 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));
 }
 
@@ -129,7 +129,7 @@ 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);
@@ -230,7 +230,7 @@ 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);
@@ -268,7 +268,7 @@ 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
@@ -291,7 +291,7 @@ 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
@@ -305,7 +305,7 @@ 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
@@ -319,7 +319,7 @@ 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[] =
@@ -335,7 +335,7 @@ 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);
@@ -366,7 +366,7 @@ 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
@@ -374,7 +374,7 @@ 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
@@ -388,7 +388,7 @@ 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
@@ -408,7 +408,7 @@ 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[] =
@@ -424,7 +424,7 @@ 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);
@@ -461,7 +461,7 @@ 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);
 }
 
@@ -476,7 +476,7 @@ 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
@@ -490,7 +490,7 @@ 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
@@ -504,7 +504,7 @@ 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
@@ -518,7 +518,7 @@ 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
@@ -532,7 +532,7 @@ 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
@@ -546,7 +546,7 @@ 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
@@ -560,7 +560,7 @@ 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
@@ -588,7 +588,7 @@ 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
@@ -616,7 +616,7 @@ 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
@@ -630,7 +630,7 @@ 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[] =
@@ -667,7 +667,7 @@ 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);
@@ -736,7 +736,7 @@ 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
@@ -750,7 +750,7 @@ 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
@@ -764,7 +764,7 @@ 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
@@ -812,7 +812,7 @@ 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);
@@ -847,7 +847,7 @@ 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
@@ -855,7 +855,7 @@ 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
@@ -866,7 +866,7 @@ 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
@@ -877,7 +877,7 @@ 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);
 }
 
@@ -888,7 +888,7 @@ 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
@@ -916,7 +916,7 @@ 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);
@@ -1060,7 +1060,7 @@ 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);
 }
 
@@ -1073,7 +1073,7 @@ 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);