1 files changed, 16 insertions, 11 deletions

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index f71e6b8822c4..9a9220333b3b 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -370,8 +370,9 @@ static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
         struct ubifs_info *c = dentry->d_sb->s_fs_info;
         unsigned long long free;
+        __le32 *uuid = (__le32 *)c->uuid;
 
-        free = ubifs_budg_get_free_space(c);
+        free = ubifs_get_free_space(c);
         dbg_gen("free space %lld bytes (%lld blocks)",
                 free, free >> UBIFS_BLOCK_SHIFT);
 
@@ -386,7 +387,8 @@ static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_files = 0;
         buf->f_ffree = 0;
         buf->f_namelen = UBIFS_MAX_NLEN;
-
+        buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
+        buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
         return 0;
 }
 
@@ -530,6 +532,12 @@ static int init_constants_early(struct ubifs_info *c)
         c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
         c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
 
+        /*
+         * Calculate how many bytes would be wasted at the end of LEB if it was
+         * fully filled with data nodes of maximum size. This is used in
+         * calculations when reporting free space.
+         */
+        c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
         return 0;
 }
 
@@ -647,13 +655,11 @@ static int init_constants_late(struct ubifs_info *c)
          * internally because it does not make much sense for UBIFS, but it is
          * necessary to report something for the 'statfs()' call.
          *
-         * Subtract the LEB reserved for GC and the LEB which is reserved for
-         * deletions.
-         *
-         * Review 'ubifs_calc_available()' if changing this calculation.
+         * Subtract the LEB reserved for GC, the LEB which is reserved for
+         * deletions, and assume only one journal head is available.
          */
-        tmp64 = c->main_lebs - 2;
-        tmp64 *= (uint64_t)c->leb_size - c->dark_wm;
+        tmp64 = c->main_lebs - 2 - c->jhead_cnt + 1;
+        tmp64 *= (uint64_t)c->leb_size - c->leb_overhead;
         tmp64 = ubifs_reported_space(c, tmp64);
         c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
 
@@ -842,7 +848,7 @@ enum {
         Opt_err,
 };
 
-static match_table_t tokens = {
+static const match_table_t tokens = {
         {Opt_fast_unmount, "fast_unmount"},
         {Opt_norm_unmount, "norm_unmount"},
         {Opt_err, NULL},
@@ -1018,14 +1024,13 @@ static int mount_ubifs(struct ubifs_info *c)
                 goto out_dereg;
         }
 
+        sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
         if (!mounted_read_only) {
                 err = alloc_wbufs(c);
                 if (err)
                         goto out_cbuf;
 
                 /* Create background thread */
-                sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num,
-                        c->vi.vol_id);
                 c->bgt = kthread_create(ubifs_bg_thread, c, c->bgt_name);
                 if (!c->bgt)
                         c->bgt = ERR_PTR(-EINVAL);