1 files changed, 27 insertions, 10 deletions

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index c5c98355459a..faa44f90608a 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -421,8 +421,8 @@ static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt)
                 seq_printf(s, ",no_chk_data_crc");
 
         if (c->mount_opts.override_compr) {
-                seq_printf(s, ",compr=");
-                seq_printf(s, ubifs_compr_name(c->mount_opts.compr_type));
+                seq_printf(s, ",compr=%s",
+                           ubifs_compr_name(c->mount_opts.compr_type));
         }
 
         return 0;
@@ -700,6 +700,8 @@ static int init_constants_sb(struct ubifs_info *c)
         if (err)
                 return err;
 
+        /* Initialize effective LEB size used in budgeting calculations */
+        c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
         return 0;
 }
 
@@ -716,6 +718,7 @@ static void init_constants_master(struct ubifs_info *c)
         long long tmp64;
 
         c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
+        c->report_rp_size = ubifs_reported_space(c, c->rp_size);
 
         /*
          * Calculate total amount of FS blocks. This number is not used
@@ -1201,7 +1204,7 @@ static int mount_ubifs(struct ubifs_info *c)
                         goto out_cbuf;
 
                 /* Create background thread */
-                c->bgt = kthread_create(ubifs_bg_thread, c, c->bgt_name);
+                c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
                 if (IS_ERR(c->bgt)) {
                         err = PTR_ERR(c->bgt);
                         c->bgt = NULL;
@@ -1318,11 +1321,15 @@ static int mount_ubifs(struct ubifs_info *c)
                 else {
                         c->need_recovery = 0;
                         ubifs_msg("recovery completed");
-                        /* GC LEB has to be empty and taken at this point */
-                        ubifs_assert(c->lst.taken_empty_lebs == 1);
+                        /*
+                         * GC LEB has to be empty and taken at this point. But
+                         * the journal head LEBs may also be accounted as
+                         * "empty taken" if they are empty.
+                         */
+                        ubifs_assert(c->lst.taken_empty_lebs > 0);
                 }
         } else
-                ubifs_assert(c->lst.taken_empty_lebs == 1);
+                ubifs_assert(c->lst.taken_empty_lebs > 0);
 
         err = dbg_check_filesystem(c);
         if (err)
@@ -1344,8 +1351,9 @@ static int mount_ubifs(struct ubifs_info *c)
         x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
         ubifs_msg("journal size:       %lld bytes (%lld KiB, %lld MiB, %d "
                   "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt);
-        ubifs_msg("media format:       %d (latest is %d)",
-                  c->fmt_version, UBIFS_FORMAT_VERSION);
+        ubifs_msg("media format:       w%d/r%d (latest is w%d/r%d)",
+                  c->fmt_version, c->ro_compat_version,
+                  UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
         ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr));
         ubifs_msg("reserved for root:  %llu bytes (%llu KiB)",
                 c->report_rp_size, c->report_rp_size >> 10);
@@ -1485,6 +1493,15 @@ static int ubifs_remount_rw(struct ubifs_info *c)
 {
         int err, lnum;
 
+        if (c->rw_incompat) {
+                ubifs_err("the file-system is not R/W-compatible");
+                ubifs_msg("on-flash format version is w%d/r%d, but software "
+                          "only supports up to version w%d/r%d", c->fmt_version,
+                          c->ro_compat_version, UBIFS_FORMAT_VERSION,
+                          UBIFS_RO_COMPAT_VERSION);
+                return -EROFS;
+        }
+
         mutex_lock(&c->umount_mutex);
         dbg_save_space_info(c);
         c->remounting_rw = 1;
@@ -1554,7 +1571,7 @@ static int ubifs_remount_rw(struct ubifs_info *c)
         ubifs_create_buds_lists(c);
 
         /* Create background thread */
-        c->bgt = kthread_create(ubifs_bg_thread, c, c->bgt_name);
+        c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
         if (IS_ERR(c->bgt)) {
                 err = PTR_ERR(c->bgt);
                 c->bgt = NULL;
@@ -1775,7 +1792,7 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
                 c->bu.buf = NULL;
         }
 
-        ubifs_assert(c->lst.taken_empty_lebs == 1);
+        ubifs_assert(c->lst.taken_empty_lebs > 0);
         return 0;
 }