UBIFS: remove custom list of superblocks

This is a clean-up of the power-cut emulation code - remove the custom list of
superblocks which we maintained to find the superblock by the UBI volume
descriptor. We do not need that crud any longer, because now we can get the
superblock as a function argument.

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

1 files changed, 20 insertions, 85 deletions

diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 3a7344124f30..1e880cedefa4 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2539,16 +2539,7 @@ error_dump:
 
 #define chance(n, d) (simple_rand() <= (n) * 32768LL / (d))
 
-struct failure_mode_info {
-        struct list_head list;
-        struct ubifs_info *c;
-};
-
-static LIST_HEAD(fmi_list);
-static DEFINE_SPINLOCK(fmi_lock);
-
 static unsigned int next;
-
 static int simple_rand(void)
 {
         if (next == 0)
@@ -2557,69 +2548,15 @@ static int simple_rand(void)
         return (next >> 16) & 32767;
 }
 
-static void failure_mode_init(struct ubifs_info *c)
-{
-        struct failure_mode_info *fmi;
-
-        fmi = kmalloc(sizeof(struct failure_mode_info), GFP_NOFS);
-        if (!fmi) {
-                ubifs_err("Failed to register failure mode - no memory");
-                return;
-        }
-        fmi->c = c;
-        spin_lock(&fmi_lock);
-        list_add_tail(&fmi->list, &fmi_list);
-        spin_unlock(&fmi_lock);
-}
-
-static void failure_mode_exit(struct ubifs_info *c)
-{
-        struct failure_mode_info *fmi, *tmp;
-
-        spin_lock(&fmi_lock);
-        list_for_each_entry_safe(fmi, tmp, &fmi_list, list)
-                if (fmi->c == c) {
-                        list_del(&fmi->list);
-                        kfree(fmi);
-                }
-        spin_unlock(&fmi_lock);
-}
-
-static struct ubifs_info *dbg_find_info(struct ubi_volume_desc *desc)
+static int do_fail(struct ubifs_info *c, int lnum, int write)
 {
-        struct failure_mode_info *fmi;
-
-        spin_lock(&fmi_lock);
-        list_for_each_entry(fmi, &fmi_list, list)
-                if (fmi->c->ubi == desc) {
-                        struct ubifs_info *c = fmi->c;
-
-                        spin_unlock(&fmi_lock);
-                        return c;
-                }
-        spin_unlock(&fmi_lock);
-        return NULL;
-}
-
-static int in_failure_mode(struct ubi_volume_desc *desc)
-{
-        struct ubifs_info *c = dbg_find_info(desc);
+        struct ubifs_debug_info *d = c->dbg;
 
-        if (c && dbg_is_tst_rcvry(c))
-                return c->dbg->failure_mode;
-        return 0;
-}
+        ubifs_assert(dbg_is_tst_rcvry(c));
 
-static int do_fail(struct ubi_volume_desc *desc, int lnum, int write)
-{
-        struct ubifs_info *c = dbg_find_info(desc);
-        struct ubifs_debug_info *d;
-
-        if (!c || !dbg_is_tst_rcvry(c))
-                return 0;
-        d = c->dbg;
         if (d->failure_mode)
                 return 1;
+
         if (!d->fail_cnt) {
                 /* First call - decide delay to failure */
                 if (chance(1, 2)) {
@@ -2716,17 +2653,17 @@ static void cut_data(const void *buf, int len)
                 p[i] = 0xff;
 }
 
-int dbg_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
+int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
                   int offs, int len, int dtype)
 {
         int err, failing;
 
-        if (in_failure_mode(desc))
+        if (c->dbg->failure_mode)
                 return -EROFS;
-        failing = do_fail(desc, lnum, 1);
+        failing = do_fail(c, lnum, 1);
         if (failing)
                 cut_data(buf, len);
-        err = ubi_leb_write(desc, lnum, buf, offs, len, dtype);
+        err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
         if (err)
                 return err;
         if (failing)
@@ -2734,45 +2671,45 @@ int dbg_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
         return 0;
 }
 
-int dbg_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
+int dbg_leb_change(struct ubifs_info *c, int lnum, const void *buf,
                    int len, int dtype)
 {
         int err;
 
-        if (do_fail(desc, lnum, 1))
+        if (do_fail(c, lnum, 1))
                 return -EROFS;
-        err = ubi_leb_change(desc, lnum, buf, len, dtype);
+        err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
         if (err)
                 return err;
-        if (do_fail(desc, lnum, 1))
+        if (do_fail(c, lnum, 1))
                 return -EROFS;
         return 0;
 }
 
-int dbg_leb_unmap(struct ubi_volume_desc *desc, int lnum)
+int dbg_leb_unmap(struct ubifs_info *c, int lnum)
 {
         int err;
 
-        if (do_fail(desc, lnum, 0))
+        if (do_fail(c, lnum, 0))
                 return -EROFS;
-        err = ubi_leb_unmap(desc, lnum);
+        err = ubi_leb_unmap(c->ubi, lnum);
         if (err)
                 return err;
-        if (do_fail(desc, lnum, 0))
+        if (do_fail(c, lnum, 0))
                 return -EROFS;
         return 0;
 }
 
-int dbg_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype)
+int dbg_leb_map(struct ubifs_info *c, int lnum, int dtype)
 {
         int err;
 
-        if (do_fail(desc, lnum, 0))
+        if (do_fail(c, lnum, 0))
                 return -EROFS;
-        err = ubi_leb_map(desc, lnum, dtype);
+        err = ubi_leb_map(c->ubi, lnum, dtype);
         if (err)
                 return err;
-        if (do_fail(desc, lnum, 0))
+        if (do_fail(c, lnum, 0))
                 return -EROFS;
         return 0;
 }
@@ -3210,7 +3147,6 @@ int ubifs_debugging_init(struct ubifs_info *c)
         if (!c->dbg)
                 return -ENOMEM;
 
-        failure_mode_init(c);
         return 0;
 }
 
@@ -3220,7 +3156,6 @@ int ubifs_debugging_init(struct ubifs_info *c)
  */
 void ubifs_debugging_exit(struct ubifs_info *c)
 {
-        failure_mode_exit(c);
         kfree(c->dbg);
 }