Merge branches 'x86/acpi', 'x86/asm', 'x86/cpudetect', 'x86/crashdump', 'x86/debug...

[linux-2.6-omap-h63xx.git] / fs / ubifs / budget.c

diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index 0e5e54d829243afba459b97a72a303aad6654e00..f393620890ee4dfd8cb4c2bde0e32dce25390635 100644 (file)
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -142,7 +142,7 @@ static long long get_liability(struct ubifs_info *c)
  *
  * This function is called when an operation cannot be budgeted because there
  * is supposedly no free space. But in most cases there is some free space:
- *   o budgeting is pessimistic, so it always budgets more then it is actually
+ *   o budgeting is pessimistic, so it always budgets more than it is actually
  *     needed, so shrinking the liability is one way to make free space - the
  *     cached data will take less space then it was budgeted for;
  *   o GC may turn some dark space into free space (budgeting treats dark space
@@ -606,7 +606,7 @@ void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req)
  * @c: UBIFS file-system description object
  *
  * This function converts budget which was allocated for a new page of data to
- * the budget of changing an existing page of data. The latter is smaller then
+ * the budget of changing an existing page of data. The latter is smaller than
  * the former, so this function only does simple re-calculation and does not
  * involve any write-back.
  */
@@ -689,7 +689,7 @@ long long ubifs_reported_space(const struct ubifs_info *c, long long free)
 }
 
 /**
- * ubifs_get_free_space - return amount of free space.
+ * ubifs_get_free_space_nolock - return amount of free space.
  * @c: UBIFS file-system description object
  *
  * This function calculates amount of free space to report to user-space.
@@ -704,16 +704,14 @@ long long ubifs_reported_space(const struct ubifs_info *c, long long free)
  * traditional file-systems, because they have way less overhead than UBIFS.
  * So, to keep users happy, UBIFS tries to take the overhead into account.
  */
-long long ubifs_get_free_space(struct ubifs_info *c)
+long long ubifs_get_free_space_nolock(struct ubifs_info *c)
 {
-       int min_idx_lebs, rsvd_idx_lebs, lebs;
+       int rsvd_idx_lebs, lebs;
        long long available, outstanding, free;
 
-       spin_lock(&c->space_lock);
-       min_idx_lebs = c->min_idx_lebs;
-       ubifs_assert(min_idx_lebs == ubifs_calc_min_idx_lebs(c));
+       ubifs_assert(c->min_idx_lebs == ubifs_calc_min_idx_lebs(c));
        outstanding = c->budg_data_growth + c->budg_dd_growth;
-       available = ubifs_calc_available(c, min_idx_lebs);
+       available = ubifs_calc_available(c, c->min_idx_lebs);
 
        /*
         * When reporting free space to user-space, UBIFS guarantees that it is
@@ -726,15 +724,14 @@ long long ubifs_get_free_space(struct ubifs_info *c)
         * Note, the calculations below are similar to what we have in
         * 'do_budget_space()', so refer there for comments.
         */
-       if (min_idx_lebs > c->lst.idx_lebs)
-               rsvd_idx_lebs = min_idx_lebs - c->lst.idx_lebs;
+       if (c->min_idx_lebs > c->lst.idx_lebs)
+               rsvd_idx_lebs = c->min_idx_lebs - c->lst.idx_lebs;
        else
                rsvd_idx_lebs = 0;
        lebs = c->lst.empty_lebs + c->freeable_cnt + c->idx_gc_cnt -
               c->lst.taken_empty_lebs;
        lebs -= rsvd_idx_lebs;
        available += lebs * (c->dark_wm - c->leb_overhead);
-       spin_unlock(&c->space_lock);
 
        if (available > outstanding)
                free = ubifs_reported_space(c, available - outstanding);
@@ -742,3 +739,21 @@ long long ubifs_get_free_space(struct ubifs_info *c)
                free = 0;
        return free;
 }
+
+/**
+ * ubifs_get_free_space - return amount of free space.
+ * @c: UBIFS file-system description object
+ *
+ * This function calculates and retuns amount of free space to report to
+ * user-space.
+ */
+long long ubifs_get_free_space(struct ubifs_info *c)
+{
+       long long free;
+
+       spin_lock(&c->space_lock);
+       free = ubifs_get_free_space_nolock(c);
+       spin_unlock(&c->space_lock);
+
+       return free;
+}