[RFC 1/1 linux-next] gfs2: convert simple_str to kstr

[Fabian Frederick]

-Remove obsolete simple_str functions.
-Return error code when kstr failed.
-This patch also calls functions corresponding to destination type.

Basically it's an RFC because of the type mismatch all over the place.
ie code was doing simple_strtol to integer...
Newer kstr functions detect such problems.
By default I used destination type as a reference. Maybe it's wrong and we
really want to read long, unsigned long from source ?

Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
 fs/gfs2/sys.c | 56 ++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 44 insertions(+), 12 deletions(-)

diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index ae8e881..436bdeb 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -101,8 +101,11 @@ static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
 
 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 {
-	int error;
-	int n = simple_strtol(buf, NULL, 0);
+	int error, n;
+
+	error = kstrtoint(buf, 0, &n);
+	if (error)
+		return error;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
@@ -134,10 +137,16 @@ static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 
 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 {
+	int error, val;
+
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	if (simple_strtol(buf, NULL, 0) != 1)
+	error = kstrtoint(buf, 0, &val);
+	if (error)
+		return error;
+
+	if (val != -1)
 		return -EINVAL;
 
 	gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
@@ -148,10 +157,16 @@ static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 				 size_t len)
 {
+	int error, val;
+
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	if (simple_strtol(buf, NULL, 0) != 1)
+	error = kstrtoint(buf, 0, &val);
+	if (error)
+		return error;
+
+	if (val != -1)
 		return -EINVAL;
 
 	gfs2_statfs_sync(sdp->sd_vfs, 0);
@@ -161,10 +176,16 @@ static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 				size_t len)
 {
+	int error, val;
+
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	if (simple_strtol(buf, NULL, 0) != 1)
+	error = kstrtoint(buf, 0, &val);
+	if (error)
+		return error;
+
+	if (val != -1)
 		return -EINVAL;
 
 	gfs2_quota_sync(sdp->sd_vfs, 0);
@@ -181,7 +202,9 @@ static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	id = simple_strtoul(buf, NULL, 0);
+	error = kstrtou32(buf, 0, &id);
+	if (error)
+		return error;
 
 	qid = make_kqid(current_user_ns(), USRQUOTA, id);
 	if (!qid_valid(qid))
@@ -201,7 +224,9 @@ static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	id = simple_strtoul(buf, NULL, 0);
+	error = kstrtou32(buf, 0, &id);
+	if (error)
+		return error;
 
 	qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 	if (!qid_valid(qid))
@@ -325,9 +350,11 @@ static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 {
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 	ssize_t ret = len;
-	int val;
+	int val, error;
 
-	val = simple_strtol(buf, NULL, 0);
+	error = kstrtoint(buf, 0, &val);
+	if (error)
+		return error;
 
 	if (val == 1)
 		set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
@@ -351,9 +378,11 @@ static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 {
 	ssize_t ret = len;
-	int val;
+	int val, error;
 
-	val = simple_strtol(buf, NULL, 0);
+	error = kstrtoint(buf, 0, &val);
+	if (error)
+		return error;
 
 	if ((val == 1) &&
 	    !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
@@ -553,11 +582,14 @@ static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 {
 	struct gfs2_tune *gt = &sdp->sd_tune;
 	unsigned int x;
+	int error;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	x = simple_strtoul(buf, NULL, 0);
+	error = kstrtouint(buf, 0, &x);
+	if (error)
+		return error;
 
 	if (check_zero && !x)
 		return -EINVAL;
-- 
1.9.1

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