[PATCH 4.19 84/96] nilfs2: replace snprintf in show functions with sysfs_emit

10 Sep 2024

4.19-stable review patch.  If anyone has any objections, please let me know.
------------------
From: Qing Wang wangqing@vivo.com
[ 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@...
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@...
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
---
 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 57afd06db62d..63ab8f9e6db3 100644
--- 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);
-- 
2.43.0





    

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[PATCH 4.19 84/96] nilfs2: replace snprintf in show functions with sysfs_emit