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([103.215.237.82]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-77f2c8aa554sm5040797b3a.34.2025.09.22.10.53.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Sep 2025 10:53:09 -0700 (PDT) From: Utkarsh Singh To: agruenba@redhat.com Cc: Utkarsh Singh , gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, rpeterso@redhat.com, david.hunter.linux@gmail.com Subject: [PATCH v2] gfs2/sysfs: Replace sprintf/snprintf with sysfs_emit() Date: Mon, 22 Sep 2025 23:22:22 +0530 Message-ID: <20250922175237.37474-1-utkarsh.singh.em@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Documentation/filesystems/sysfs.rst mentions that show() should only use sysfs_emit() or sysfs_emit_at() when formatting values returned to user space. This patch updates the GFS2 sysfs interface accordingly. It replaces uses of sprintf() and snprintf() in all *_show() functions with sysfs_emit() to align with current kernel sysfs API best practices. It also updates the GFS2_SHOW_UINT macro to use sysfs_emit() instead of snprintf(). Signed-off-by: Utkarsh Singh --- v1 --> v2: Code style cleanup and maintainer updates=20 =20 fs/gfs2/sys.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c index c3c8842920d2..487fff098465 100644 --- a/fs/gfs2/sys.c +++ b/fs/gfs2/sys.c @@ -59,7 +59,7 @@ static struct kset *gfs2_kset; =20 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) { - return snprintf(buf, PAGE_SIZE, "%u:%u\n", + return sysfs_emit(buf, "%u:%u\n", MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); } =20 @@ -68,7 +68,7 @@ static ssize_t status_show(struct gfs2_sbd *sdp, char *bu= f) unsigned long f =3D sdp->sd_flags; ssize_t s; =20 - s =3D snprintf(buf, PAGE_SIZE, + s =3D sysfs_emit(buf, "Journal Checked: %d\n" "Journal Live: %d\n" "Journal ID: %d\n" @@ -140,7 +140,7 @@ static ssize_t status_show(struct gfs2_sbd *sdp, char *= buf) =20 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) { - return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); + return sysfs_emit(buf, "%s\n", sdp->sd_fsname); } =20 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) @@ -150,7 +150,7 @@ static ssize_t uuid_show(struct gfs2_sbd *sdp, char *bu= f) buf[0] =3D '\0'; if (uuid_is_null(&s->s_uuid)) return 0; - return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid); + return sysfs_emit(buf, "%pUB\n", &s->s_uuid); } =20 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) @@ -158,7 +158,7 @@ static ssize_t freeze_show(struct gfs2_sbd *sdp, char *= buf) struct super_block *sb =3D sdp->sd_vfs; int frozen =3D (sb->s_writers.frozen =3D=3D SB_UNFROZEN) ? 0 : 1; =20 - return snprintf(buf, PAGE_SIZE, "%d\n", frozen); + return sysfs_emit(buf, "%d\n", frozen); } =20 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t = len) @@ -194,7 +194,7 @@ static ssize_t freeze_store(struct gfs2_sbd *sdp, const= char *buf, size_t len) static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) { unsigned int b =3D gfs2_withdrawing_or_withdrawn(sdp); - return snprintf(buf, PAGE_SIZE, "%u\n", b); + return sysfs_emit(buf, "%u\n", b); } =20 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_= t len) @@ -397,7 +397,7 @@ static struct kobj_type gfs2_ktype =3D { static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) { const struct lm_lockops *ops =3D sdp->sd_lockstruct.ls_ops; - return sprintf(buf, "%s\n", ops->lm_proto_name); + return sysfs_emit(buf, "%s\n", ops->lm_proto_name); } =20 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) @@ -408,7 +408,7 @@ static ssize_t block_show(struct gfs2_sbd *sdp, char *b= uf) =20 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags)) val =3D 1; - ret =3D sprintf(buf, "%d\n", val); + ret =3D sysfs_emit(buf, "%d\n", val); return ret; } =20 @@ -437,7 +437,7 @@ static ssize_t wdack_show(struct gfs2_sbd *sdp, char *b= uf) { int val =3D completion_done(&sdp->sd_wdack) ? 1 : 0; =20 - return sprintf(buf, "%d\n", val); + return sysfs_emit(buf, "%d\n", val); } =20 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t l= en) @@ -459,7 +459,7 @@ static ssize_t wdack_store(struct gfs2_sbd *sdp, const = char *buf, size_t len) static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls =3D &sdp->sd_lockstruct; - return sprintf(buf, "%d\n", ls->ls_first); + return sysfs_emit(buf, "%d\n", ls->ls_first); } =20 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t= len) @@ -492,7 +492,7 @@ static ssize_t lkfirst_store(struct gfs2_sbd *sdp, cons= t char *buf, size_t len) static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls =3D &sdp->sd_lockstruct; - return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_reco= ver_flags)); + return sysfs_emit(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_r= ecover_flags)); } =20 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid) @@ -550,18 +550,18 @@ static ssize_t recover_store(struct gfs2_sbd *sdp, co= nst char *buf, size_t len) static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls =3D &sdp->sd_lockstruct; - return sprintf(buf, "%d\n", ls->ls_recover_jid_done); + return sysfs_emit(buf, "%d\n", ls->ls_recover_jid_done); } =20 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls =3D &sdp->sd_lockstruct; - return sprintf(buf, "%d\n", ls->ls_recover_jid_status); + return sysfs_emit(buf, "%d\n", ls->ls_recover_jid_status); } =20 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) { - return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid); + return sysfs_emit(buf, "%d\n", sdp->sd_lockstruct.ls_jid); } =20 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) @@ -626,7 +626,7 @@ static struct attribute *lock_module_attrs[] =3D { =20 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) { - return snprintf(buf, PAGE_SIZE, "%u %u\n", + return sysfs_emit(buf, "%u %u\n", sdp->sd_tune.gt_quota_scale_num, sdp->sd_tune.gt_quota_scale_den); } @@ -679,7 +679,7 @@ static struct gfs2_attr tune_attr_##name =3D __ATTR(nam= e, 0644, show, store) #define TUNE_ATTR_2(name, store) = \ static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) = \ { = \ - return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ + return sysfs_emit(buf, "%u\n", sdp->sd_tune.gt_##name); \ } = \ TUNE_ATTR_3(name, name##_show, store) =20 --=20 2.43.0