UBIFS: introduce mounting flag

This is a preparational patch which removes the 'c->always_chk_crc' which was
set during mounting and remounting to R/W mode and introduces 'c->mounting'
flag which is set when mounting. Now the 'c->always_chk_crc' flag is the
same as 'c->remounting_rw && c->mounting'.

This patch is a preparation for the next one which will need to know when we
are mounting and remounting to R/W mode, which is exactly what
'c->always_chk_crc' effectively is, but its name does not suite the
next patch. The other possibility would be to just re-name it, but then
we'd end up with less logical flags coverage.

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

4 files changed, 19 insertions, 19 deletions

diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index d82173182eeb..d1fe56203a1d 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -88,8 +88,12 @@ void ubifs_ro_mode(struct ubifs_info *c, int err)
  * This function may skip data nodes CRC checking if @c->no_chk_data_crc is
  * true, which is controlled by corresponding UBIFS mount option. However, if
  * @must_chk_crc is true, then @c->no_chk_data_crc is ignored and CRC is
- * checked. Similarly, if @c->always_chk_crc is true, @c->no_chk_data_crc is
- * ignored and CRC is checked.
+ * checked. Similarly, if @c->mounting or @c->remounting_rw is true (we are
+ * mounting or re-mounting to R/W mode), @c->no_chk_data_crc is ignored and CRC
+ * is checked. This is because during mounting or re-mounting from R/O mode to
+ * R/W mode we may read journal nodes (when replying the journal or doing the
+ * recovery) and the journal nodes may potentially be corrupted, so checking is
+ * required.
  *
  * This function returns zero in case of success and %-EUCLEAN in case of bad
  * CRC or magic.
@@ -131,8 +135,8 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
                    node_len > c->ranges[type].max_len)
                 goto out_len;
 
-        if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->always_chk_crc &&
-             c->no_chk_data_crc)
+        if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->mounting &&
+            !c->remounting_rw && c->no_chk_data_crc)
                 return 0;
 
         crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 91fac54c70e3..703a62109cf2 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1194,11 +1194,7 @@ static int mount_ubifs(struct ubifs_info *c)
         if (c->bulk_read == 1)
                 bu_init(c);
 
-        /*
-         * We have to check all CRCs, even for data nodes, when we mount the FS
-         * (specifically, when we are replaying).
-         */
-        c->always_chk_crc = 1;
+        c->mounting = 1;
 
         err = ubifs_read_superblock(c);
         if (err)
@@ -1374,7 +1370,7 @@ static int mount_ubifs(struct ubifs_info *c)
         if (err)
                 goto out_infos;
 
-        c->always_chk_crc = 0;
+        c->mounting = 0;
 
         ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
                   c->vi.ubi_num, c->vi.vol_id, c->vi.name);
@@ -1535,7 +1531,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
         mutex_lock(&c->umount_mutex);
         dbg_save_space_info(c);
         c->remounting_rw = 1;
-        c->always_chk_crc = 1;
 
         err = check_free_space(c);
         if (err)
@@ -1642,7 +1637,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
         dbg_gen("re-mounted read-write");
         c->ro_mount = 0;
         c->remounting_rw = 0;
-        c->always_chk_crc = 0;
         err = dbg_check_space_info(c);
         mutex_unlock(&c->umount_mutex);
         return err;
@@ -1659,7 +1653,6 @@ out:
         c->ileb_buf = NULL;
         ubifs_lpt_free(c, 1);
         c->remounting_rw = 0;
-        c->always_chk_crc = 0;
         mutex_unlock(&c->umount_mutex);
         return err;
 }
diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index ad9cf0133622..de485979ca39 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -447,8 +447,11 @@ static int tnc_read_node_nm(struct ubifs_info *c, struct ubifs_zbranch *zbr,
  *
  * Note, this function does not check CRC of data nodes if @c->no_chk_data_crc
  * is true (it is controlled by corresponding mount option). However, if
- * @c->always_chk_crc is true, @c->no_chk_data_crc is ignored and CRC is always
- * checked.
+ * @c->mounting or @c->remounting_rw is true (we are mounting or re-mounting to
+ * R/W mode), @c->no_chk_data_crc is ignored and CRC is checked. This is
+ * because during mounting or re-mounting from R/O mode to R/W mode we may read
+ * journal nodes (when replying the journal or doing the recovery) and the
+ * journal nodes may potentially be corrupted, so checking is required.
  */
 static int try_read_node(const struct ubifs_info *c, void *buf, int type,
                          int len, int lnum, int offs)
@@ -476,7 +479,8 @@ static int try_read_node(const struct ubifs_info *c, void *buf, int type,
         if (node_len != len)
                 return 0;
 
-        if (type == UBIFS_DATA_NODE && !c->always_chk_crc && c->no_chk_data_crc)
+        if (type == UBIFS_DATA_NODE && c->no_chk_data_crc && !c->mounting &&
+            !c->remounting_rw)
                 return 1;
 
         crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index d1efa37d80ae..d1823541f987 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1169,9 +1169,8 @@ struct ubifs_debug_info;
  * @empty: %1 if the UBI device is empty
  * @need_recovery: %1 if the file-system needs recovery
  * @replaying: %1 during journal replay
+ * @mounting: %1 while mounting
  * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode
- * @always_chk_crc: always check CRCs (while mounting and remounting to R/W
- *                  mode)
  * @replay_tree: temporary tree used during journal replay
  * @replay_list: temporary list used during journal replay
  * @replay_buds: list of buds to replay
@@ -1405,8 +1404,8 @@ struct ubifs_info {
         unsigned int empty:1;
         unsigned int need_recovery:1;
         unsigned int replaying:1;
+        unsigned int mounting:1;
         unsigned int remounting_rw:1;
-        unsigned int always_chk_crc:1;
         struct rb_root replay_tree;
         struct list_head replay_list;
         struct list_head replay_buds;