UBIFS: share the next_log_lnum helper

We'll need to use the 'next_log_lnum()' helper function from log.c in the fixup
code, so let's move it to misc.h. IOW, this is a preparation to the following
free space fixup changes.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

2 files changed, 24 insertions, 21 deletions

diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c
index 40fa780ebea7..affea9494ae2 100644
--- a/fs/ubifs/log.c
+++ b/fs/ubifs/log.c
@@ -100,20 +100,6 @@ struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum)
 }
 
 /**
- * next_log_lnum - switch to the next log LEB.
- * @c: UBIFS file-system description object
- * @lnum: current log LEB
- */
-static inline int next_log_lnum(const struct ubifs_info *c, int lnum)
-{
-        lnum += 1;
-        if (lnum > c->log_last)
-                lnum = UBIFS_LOG_LNUM;
-
-        return lnum;
-}
-
-/**
  * empty_log_bytes - calculate amount of empty space in the log.
  * @c: UBIFS file-system description object
  */
@@ -257,7 +243,7 @@ int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs)
         ref->jhead = cpu_to_le32(jhead);
 
         if (c->lhead_offs > c->leb_size - c->ref_node_alsz) {
-                c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
+                c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
                 c->lhead_offs = 0;
         }
 
@@ -425,7 +411,7 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
 
         /* Switch to the next log LEB */
         if (c->lhead_offs) {
-                c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
+                c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
                 c->lhead_offs = 0;
         }
 
@@ -446,7 +432,7 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
 
         c->lhead_offs += len;
         if (c->lhead_offs == c->leb_size) {
-                c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
+                c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
                 c->lhead_offs = 0;
         }
 
@@ -533,7 +519,7 @@ int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum)
         }
         mutex_lock(&c->log_mutex);
         for (lnum = old_ltail_lnum; lnum != c->ltail_lnum;
-             lnum = next_log_lnum(c, lnum)) {
+             lnum = ubifs_next_log_lnum(c, lnum)) {
                 dbg_log("unmap log LEB %d", lnum);
                 err = ubifs_leb_unmap(c, lnum);
                 if (err)
@@ -642,7 +628,7 @@ static int add_node(struct ubifs_info *c, void *buf, int *lnum, int *offs,
                 err = ubifs_leb_change(c, *lnum, buf, sz, UBI_SHORTTERM);
                 if (err)
                         return err;
-                *lnum = next_log_lnum(c, *lnum);
+                *lnum = ubifs_next_log_lnum(c, *lnum);
                 *offs = 0;
         }
         memcpy(buf + *offs, node, len);
@@ -712,7 +698,7 @@ int ubifs_consolidate_log(struct ubifs_info *c)
                 ubifs_scan_destroy(sleb);
                 if (lnum == c->lhead_lnum)
                         break;
-                lnum = next_log_lnum(c, lnum);
+                lnum = ubifs_next_log_lnum(c, lnum);
         }
         if (offs) {
                 int sz = ALIGN(offs, c->min_io_size);
@@ -732,7 +718,7 @@ int ubifs_consolidate_log(struct ubifs_info *c)
         /* Unmap remaining LEBs */
         lnum = write_lnum;
         do {
-                lnum = next_log_lnum(c, lnum);
+                lnum = ubifs_next_log_lnum(c, lnum);
                 err = ubifs_leb_unmap(c, lnum);
                 if (err)
                         return err;
diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h
index c3de04dc952a..0b5296a9a4c5 100644
--- a/fs/ubifs/misc.h
+++ b/fs/ubifs/misc.h
@@ -340,4 +340,21 @@ static inline void ubifs_release_lprops(struct ubifs_info *c)
         mutex_unlock(&c->lp_mutex);
 }
 
+/**
+ * ubifs_next_log_lnum - switch to the next log LEB.
+ * @c: UBIFS file-system description object
+ * @lnum: current log LEB
+ *
+ * This helper function returns the log LEB number which goes next after LEB
+ * 'lnum'.
+ */
+static inline int ubifs_next_log_lnum(const struct ubifs_info *c, int lnum)
+{
+        lnum += 1;
+        if (lnum > c->log_last)
+                lnum = UBIFS_LOG_LNUM;
+
+        return lnum;
+}
+
 #endif /* __UBIFS_MISC_H__ */