dlm: Remove seq_printf() return checks and use seq_has_overflowed()

The seq_printf() return is going away soon and users of it should
check seq_has_overflowed() to see if the buffer is full and will
not accept any more data.

Convert functions returning int to void where seq_printf() is used.

Link: http://lkml.kernel.org/p/43590057bcb83846acbbcc1fe641f792b2fb7773.1412031505.git.joe@perches.com
Link: http://lkml.kernel.org/r/20141029220107.939492048@goodmis.org

Acked-by: David Teigland <teigland@redhat.com>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: cluster-devel@redhat.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 117 insertions, 134 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 1323c568e362..3bf460894088 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -48,8 +48,8 @@ static char *print_lockmode(int mode)
         }
 }
 
-static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
-                              struct dlm_rsb *res)
+static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
+                               struct dlm_rsb *res)
 {
         seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
 
@@ -68,21 +68,17 @@ static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
         if (lkb->lkb_wait_type)
                 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
 
-        return seq_puts(s, "\n");
+        seq_puts(s, "\n");
 }
 
-static int print_format1(struct dlm_rsb *res, struct seq_file *s)
+static void print_format1(struct dlm_rsb *res, struct seq_file *s)
 {
         struct dlm_lkb *lkb;
         int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
-        int rv;
 
         lock_rsb(res);
 
-        rv = seq_printf(s, "\nResource %p Name (len=%d) \"",
-                        res, res->res_length);
-        if (rv)
-                goto out;
+        seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
 
         for (i = 0; i < res->res_length; i++) {
                 if (isprint(res->res_name[i]))
@@ -92,17 +88,16 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
         }
 
         if (res->res_nodeid > 0)
-                rv = seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
-                                res->res_nodeid);
+                seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
+                           res->res_nodeid);
         else if (res->res_nodeid == 0)
-                rv = seq_puts(s, "\"\nMaster Copy\n");
+                seq_puts(s, "\"\nMaster Copy\n");
         else if (res->res_nodeid == -1)
-                rv = seq_printf(s, "\"\nLooking up master (lkid %x)\n",
-                                res->res_first_lkid);
+                seq_printf(s, "\"\nLooking up master (lkid %x)\n",
+                           res->res_first_lkid);
         else
-                rv = seq_printf(s, "\"\nInvalid master %d\n",
-                                res->res_nodeid);
-        if (rv)
+                seq_printf(s, "\"\nInvalid master %d\n", res->res_nodeid);
+        if (seq_has_overflowed(s))
                 goto out;
 
         /* Print the LVB: */
@@ -116,8 +111,8 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
                 }
                 if (rsb_flag(res, RSB_VALNOTVALID))
                         seq_puts(s, " (INVALID)");
-                rv = seq_puts(s, "\n");
-                if (rv)
+                seq_puts(s, "\n");
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
@@ -125,32 +120,30 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
         recover_list = !list_empty(&res->res_recover_list);
 
         if (root_list || recover_list) {
-                rv = seq_printf(s, "Recovery: root %d recover %d flags %lx "
-                                "count %d\n", root_list, recover_list,
-                                res->res_flags, res->res_recover_locks_count);
-                if (rv)
-                        goto out;
+                seq_printf(s, "Recovery: root %d recover %d flags %lx count %d\n",
+                           root_list, recover_list,
+                           res->res_flags, res->res_recover_locks_count);
         }
 
         /* Print the locks attached to this resource */
         seq_puts(s, "Granted Queue\n");
         list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
-                rv = print_format1_lock(s, lkb, res);
-                if (rv)
+                print_format1_lock(s, lkb, res);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         seq_puts(s, "Conversion Queue\n");
         list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
-                rv = print_format1_lock(s, lkb, res);
-                if (rv)
+                print_format1_lock(s, lkb, res);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         seq_puts(s, "Waiting Queue\n");
         list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
-                rv = print_format1_lock(s, lkb, res);
-                if (rv)
+                print_format1_lock(s, lkb, res);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
@@ -159,23 +152,23 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
 
         seq_puts(s, "Lookup Queue\n");
         list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
-                rv = seq_printf(s, "%08x %s", lkb->lkb_id,
-                                print_lockmode(lkb->lkb_rqmode));
+                seq_printf(s, "%08x %s",
+                           lkb->lkb_id, print_lockmode(lkb->lkb_rqmode));
                 if (lkb->lkb_wait_type)
                         seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
-                rv = seq_puts(s, "\n");
+                seq_puts(s, "\n");
+                if (seq_has_overflowed(s))
+                        goto out;
         }
  out:
         unlock_rsb(res);
-        return rv;
 }
 
-static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
-                              struct dlm_rsb *r)
+static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
+                               struct dlm_rsb *r)
 {
         u64 xid = 0;
         u64 us;
-        int rv;
 
         if (lkb->lkb_flags & DLM_IFL_USER) {
                 if (lkb->lkb_ua)
@@ -188,103 +181,97 @@ static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
         /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
            r_nodeid r_len r_name */
 
-        rv = seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
-                        lkb->lkb_id,
-                        lkb->lkb_nodeid,
-                        lkb->lkb_remid,
-                        lkb->lkb_ownpid,
-                        (unsigned long long)xid,
-                        lkb->lkb_exflags,
-                        lkb->lkb_flags,
-                        lkb->lkb_status,
-                        lkb->lkb_grmode,
-                        lkb->lkb_rqmode,
-                        (unsigned long long)us,
-                        r->res_nodeid,
-                        r->res_length,
-                        r->res_name);
-        return rv;
+        seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
+                   lkb->lkb_id,
+                   lkb->lkb_nodeid,
+                   lkb->lkb_remid,
+                   lkb->lkb_ownpid,
+                   (unsigned long long)xid,
+                   lkb->lkb_exflags,
+                   lkb->lkb_flags,
+                   lkb->lkb_status,
+                   lkb->lkb_grmode,
+                   lkb->lkb_rqmode,
+                   (unsigned long long)us,
+                   r->res_nodeid,
+                   r->res_length,
+                   r->res_name);
 }
 
-static int print_format2(struct dlm_rsb *r, struct seq_file *s)
+static void print_format2(struct dlm_rsb *r, struct seq_file *s)
 {
         struct dlm_lkb *lkb;
-        int rv = 0;
 
         lock_rsb(r);
 
         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
-                rv = print_format2_lock(s, lkb, r);
-                if (rv)
+                print_format2_lock(s, lkb, r);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
-                rv = print_format2_lock(s, lkb, r);
-                if (rv)
+                print_format2_lock(s, lkb, r);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
-                rv = print_format2_lock(s, lkb, r);
-                if (rv)
+                print_format2_lock(s, lkb, r);
+                if (seq_has_overflowed(s))
                         goto out;
         }
  out:
         unlock_rsb(r);
-        return rv;
 }
 
-static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
+static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
                               int rsb_lookup)
 {
         u64 xid = 0;
-        int rv;
 
         if (lkb->lkb_flags & DLM_IFL_USER) {
                 if (lkb->lkb_ua)
                         xid = lkb->lkb_ua->xid;
         }
 
-        rv = seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
-                        lkb->lkb_id,
-                        lkb->lkb_nodeid,
-                        lkb->lkb_remid,
-                        lkb->lkb_ownpid,
-                        (unsigned long long)xid,
-                        lkb->lkb_exflags,
-                        lkb->lkb_flags,
-                        lkb->lkb_status,
-                        lkb->lkb_grmode,
-                        lkb->lkb_rqmode,
-                        lkb->lkb_last_bast.mode,
-                        rsb_lookup,
-                        lkb->lkb_wait_type,
-                        lkb->lkb_lvbseq,
-                        (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
-                        (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
-        return rv;
+        seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
+                   lkb->lkb_id,
+                   lkb->lkb_nodeid,
+                   lkb->lkb_remid,
+                   lkb->lkb_ownpid,
+                   (unsigned long long)xid,
+                   lkb->lkb_exflags,
+                   lkb->lkb_flags,
+                   lkb->lkb_status,
+                   lkb->lkb_grmode,
+                   lkb->lkb_rqmode,
+                   lkb->lkb_last_bast.mode,
+                   rsb_lookup,
+                   lkb->lkb_wait_type,
+                   lkb->lkb_lvbseq,
+                   (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
+                   (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
 }
 
-static int print_format3(struct dlm_rsb *r, struct seq_file *s)
+static void print_format3(struct dlm_rsb *r, struct seq_file *s)
 {
         struct dlm_lkb *lkb;
         int i, lvblen = r->res_ls->ls_lvblen;
         int print_name = 1;
-        int rv;
 
         lock_rsb(r);
 
-        rv = seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
-                        r,
-                        r->res_nodeid,
-                        r->res_first_lkid,
-                        r->res_flags,
-                        !list_empty(&r->res_root_list),
-                        !list_empty(&r->res_recover_list),
-                        r->res_recover_locks_count,
-                        r->res_length);
-        if (rv)
+        seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
+                   r,
+                   r->res_nodeid,
+                   r->res_first_lkid,
+                   r->res_flags,
+                   !list_empty(&r->res_root_list),
+                   !list_empty(&r->res_recover_list),
+                   r->res_recover_locks_count,
+                   r->res_length);
+        if (seq_has_overflowed(s))
                 goto out;
 
         for (i = 0; i < r->res_length; i++) {
@@ -300,8 +287,8 @@ static int print_format3(struct dlm_rsb *r, struct seq_file *s)
                 else
                         seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
         }
-        rv = seq_puts(s, "\n");
-        if (rv)
+        seq_puts(s, "\n");
+        if (seq_has_overflowed(s))
                 goto out;
 
         if (!r->res_lvbptr)
@@ -311,58 +298,55 @@ static int print_format3(struct dlm_rsb *r, struct seq_file *s)
 
         for (i = 0; i < lvblen; i++)
                 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
-        rv = seq_puts(s, "\n");
-        if (rv)
+        seq_puts(s, "\n");
+        if (seq_has_overflowed(s))
                 goto out;
 
  do_locks:
         list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
-                rv = print_format3_lock(s, lkb, 0);
-                if (rv)
+                print_format3_lock(s, lkb, 0);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
-                rv = print_format3_lock(s, lkb, 0);
-                if (rv)
+                print_format3_lock(s, lkb, 0);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
-                rv = print_format3_lock(s, lkb, 0);
-                if (rv)
+                print_format3_lock(s, lkb, 0);
+                if (seq_has_overflowed(s))
                         goto out;
         }
 
         list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
-                rv = print_format3_lock(s, lkb, 1);
-                if (rv)
+                print_format3_lock(s, lkb, 1);
+                if (seq_has_overflowed(s))
                         goto out;
         }
  out:
         unlock_rsb(r);
-        return rv;
 }
 
-static int print_format4(struct dlm_rsb *r, struct seq_file *s)
+static void print_format4(struct dlm_rsb *r, struct seq_file *s)
 {
         int our_nodeid = dlm_our_nodeid();
         int print_name = 1;
-        int i, rv;
+        int i;
 
         lock_rsb(r);
 
-        rv = seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
-                        r,
-                        r->res_nodeid,
-                        r->res_master_nodeid,
-                        r->res_dir_nodeid,
-                        our_nodeid,
-                        r->res_toss_time,
-                        r->res_flags,
-                        r->res_length);
-        if (rv)
-                goto out;
+        seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
+                   r,
+                   r->res_nodeid,
+                   r->res_master_nodeid,
+                   r->res_dir_nodeid,
+                   our_nodeid,
+                   r->res_toss_time,
+                   r->res_flags,
+                   r->res_length);
 
         for (i = 0; i < r->res_length; i++) {
                 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
@@ -377,10 +361,9 @@ static int print_format4(struct dlm_rsb *r, struct seq_file *s)
                 else
                         seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
         }
-        rv = seq_puts(s, "\n");
- out:
+        seq_puts(s, "\n");
+
         unlock_rsb(r);
-        return rv;
 }
 
 struct rsbtbl_iter {
@@ -390,20 +373,20 @@ struct rsbtbl_iter {
         int header;
 };
 
-/* seq_printf returns -1 if the buffer is full, and 0 otherwise.
-   If the buffer is full, seq_printf can be called again, but it
-   does nothing and just returns -1.  So, the these printing routines
-   periodically check the return value to avoid wasting too much time
-   trying to print to a full buffer. */
+/*
+ * If the buffer is full, seq_printf can be called again, but it
+ * does nothing.  So, the these printing routines periodically check
+ * seq_has_overflowed to avoid wasting too much time trying to print to
+ * a full buffer.
+ */
 
 static int table_seq_show(struct seq_file *seq, void *iter_ptr)
 {
         struct rsbtbl_iter *ri = iter_ptr;
-        int rv = 0;
 
         switch (ri->format) {
         case 1:
-                rv = print_format1(ri->rsb, seq);
+                print_format1(ri->rsb, seq);
                 break;
         case 2:
                 if (ri->header) {
@@ -412,25 +395,25 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr)
                                         "r_nodeid r_len r_name\n");
                         ri->header = 0;
                 }
-                rv = print_format2(ri->rsb, seq);
+                print_format2(ri->rsb, seq);
                 break;
         case 3:
                 if (ri->header) {
                         seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
                         ri->header = 0;
                 }
-                rv = print_format3(ri->rsb, seq);
+                print_format3(ri->rsb, seq);
                 break;
         case 4:
                 if (ri->header) {
                         seq_printf(seq, "version 4 rsb 2\n");
                         ri->header = 0;
                 }
-                rv = print_format4(ri->rsb, seq);
+                print_format4(ri->rsb, seq);
                 break;
         }
 
-        return rv;
+        return 0;
 }
 
 static const struct seq_operations format1_seq_ops;