ext4: init statistics after journal recovery

[safe/jmp/linux-2.6] / fs / ext4 / super.c

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e14d22c..d83cdcb 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -241,6 +241,7 @@ handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
        if (sb->s_flags & MS_RDONLY)
                return ERR_PTR(-EROFS);
 
+       vfs_check_frozen(sb, SB_FREEZE_WRITE);
        /* Special case here: if the journal has aborted behind our
         * backs (eg. EIO in the commit thread), then we still need to
         * take the FS itself readonly cleanly. */
@@ -2793,24 +2794,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        get_random_bytes(&sbi->s_next_generation, sizeof(u32));
        spin_lock_init(&sbi->s_next_gen_lock);
 
-       err = percpu_counter_init(&sbi->s_freeblocks_counter,
-                       ext4_count_free_blocks(sb));
-       if (!err) {
-               err = percpu_counter_init(&sbi->s_freeinodes_counter,
-                               ext4_count_free_inodes(sb));
-       }
-       if (!err) {
-               err = percpu_counter_init(&sbi->s_dirs_counter,
-                               ext4_count_dirs(sb));
-       }
-       if (!err) {
-               err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
-       }
-       if (err) {
-               ext4_msg(sb, KERN_ERR, "insufficient memory");
-               goto failed_mount3;
-       }
-
        sbi->s_stripe = ext4_get_stripe_size(sbi);
        sbi->s_max_writeback_mb_bump = 128;
 
@@ -2910,6 +2893,20 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
 
 no_journal:
+       err = percpu_counter_init(&sbi->s_freeblocks_counter,
+                                 ext4_count_free_blocks(sb));
+       if (!err)
+               err = percpu_counter_init(&sbi->s_freeinodes_counter,
+                                         ext4_count_free_inodes(sb));
+       if (!err)
+               err = percpu_counter_init(&sbi->s_dirs_counter,
+                                         ext4_count_dirs(sb));
+       if (!err)
+               err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
+       if (err) {
+               ext4_msg(sb, KERN_ERR, "insufficient memory");
+               goto failed_mount_wq;
+       }
        if (test_opt(sb, NOBH)) {
                if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
                        ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
@@ -3059,6 +3056,10 @@ failed_mount_wq:
                jbd2_journal_destroy(sbi->s_journal);
                sbi->s_journal = NULL;
        }
+       percpu_counter_destroy(&sbi->s_freeblocks_counter);
+       percpu_counter_destroy(&sbi->s_freeinodes_counter);
+       percpu_counter_destroy(&sbi->s_dirs_counter);
+       percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
 failed_mount3:
        if (sbi->s_flex_groups) {
                if (is_vmalloc_addr(sbi->s_flex_groups))
@@ -3066,10 +3067,6 @@ failed_mount3:
                else
                        kfree(sbi->s_flex_groups);
        }
-       percpu_counter_destroy(&sbi->s_freeblocks_counter);
-       percpu_counter_destroy(&sbi->s_freeinodes_counter);
-       percpu_counter_destroy(&sbi->s_dirs_counter);
-       percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
 failed_mount2:
        for (i = 0; i < db_count; i++)
                brelse(sbi->s_group_desc[i]);
@@ -3485,8 +3482,10 @@ int ext4_force_commit(struct super_block *sb)
                return 0;
 
        journal = EXT4_SB(sb)->s_journal;
-       if (journal)
+       if (journal) {
+               vfs_check_frozen(sb, SB_FREEZE_WRITE);
                ret = ext4_journal_force_commit(journal);
+       }
 
        return ret;
 }
@@ -3535,18 +3534,16 @@ static int ext4_freeze(struct super_block *sb)
         * the journal.
         */
        error = jbd2_journal_flush(journal);
-       if (error < 0) {
-       out:
-               jbd2_journal_unlock_updates(journal);
-               return error;
-       }
+       if (error < 0)
+               goto out;
 
        /* Journal blocked and flushed, clear needs_recovery flag. */
        EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
        error = ext4_commit_super(sb, 1);
-       if (error)
-               goto out;
-       return 0;
+out:
+       /* we rely on s_frozen to stop further updates */
+       jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+       return error;
 }
 
 /*
@@ -3563,7 +3560,6 @@ static int ext4_unfreeze(struct super_block *sb)
        EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
        ext4_commit_super(sb, 1);
        unlock_super(sb);
-       jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
        return 0;
 }