Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 bug fixes from Ted Ts'o:
 "Various bug fixes for ext4.  The most important is a fix for the new
  extent cache's slab shrinker which can cause significant, user-visible
  pauses when the system is under memory pressure."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: enable quotas before orphan cleanup
  ext4: don't allow quota mount options when quota feature enabled
  ext4: fix a warning from sparse check for ext4_dir_llseek
  ext4: convert number of blocks to clusters properly
  ext4: fix possible memory leak in ext4_remount()
  jbd2: fix ERR_PTR dereference in jbd2__journal_start
  ext4: use percpu counter for extent cache count
  ext4: optimize ext4_es_shrink()

1 files changed, 43 insertions, 18 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 620cf5615ba2..5e6c87836193 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -783,6 +783,7 @@ static void ext4_put_super(struct super_block *sb)
 	percpu_counter_destroy(&sbi->s_freeinodes_counter);
 	percpu_counter_destroy(&sbi->s_dirs_counter);
 	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
 	brelse(sbi->s_sbh);
 #ifdef CONFIG_QUOTA
 	for (i = 0; i < MAXQUOTAS; i++)
@@ -1247,6 +1248,11 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 			"quota options when quota turned on");
 		return -1;
 	}
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
+		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
+			 "when QUOTA feature is enabled");
+		return -1;
+	}
 	qname = match_strdup(args);
 	if (!qname) {
 		ext4_msg(sb, KERN_ERR,
@@ -1544,6 +1550,13 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 				 "quota options when quota turned on");
 			return -1;
 		}
+		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
+					       EXT4_FEATURE_RO_COMPAT_QUOTA)) {
+			ext4_msg(sb, KERN_ERR,
+				 "Cannot set journaled quota options "
+				 "when QUOTA feature is enabled");
+			return -1;
+		}
 		sbi->s_jquota_fmt = m->mount_opt;
 #endif
 	} else {
@@ -1592,6 +1605,12 @@ static int parse_options(char *options, struct super_block *sb,
 			return 0;
 	}
 #ifdef CONFIG_QUOTA
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
+	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
+		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
+			 "feature is enabled");
+		return 0;
+	}
 	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
 		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
 			clear_opt(sb, USRQUOTA);
@@ -3161,7 +3180,7 @@ int ext4_calculate_overhead(struct super_block *sb)
 	}
 	/* Add the journal blocks as well */
 	if (sbi->s_journal)
-		overhead += EXT4_B2C(sbi, sbi->s_journal->j_maxlen);
+		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
 
 	sbi->s_overhead = overhead;
 	smp_wmb();
@@ -3688,6 +3707,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	if (!err) {
 		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
 	}
+	if (!err) {
+		err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
+	}
 	if (err) {
 		ext4_msg(sb, KERN_ERR, "insufficient memory");
 		goto failed_mount3;
@@ -3711,13 +3733,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_export_op = &ext4_export_ops;
 	sb->s_xattr = ext4_xattr_handlers;
 #ifdef CONFIG_QUOTA
-	sb->s_qcop = &ext4_qctl_operations;
 	sb->dq_op = &ext4_quota_operations;
-
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
-		/* Use qctl operations for hidden quota files. */
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
 		sb->s_qcop = &ext4_qctl_sysfile_operations;
-	}
+	else
+		sb->s_qcop = &ext4_qctl_operations;
 #endif
 	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
 
@@ -3913,6 +3933,16 @@ no_journal:
 	if (err)
 		goto failed_mount7;
 
+#ifdef CONFIG_QUOTA
+	/* Enable quota usage during mount. */
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
+	    !(sb->s_flags & MS_RDONLY)) {
+		err = ext4_enable_quotas(sb);
+		if (err)
+			goto failed_mount8;
+	}
+#endif  /* CONFIG_QUOTA */
+
 	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
 	ext4_orphan_cleanup(sb, es);
 	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
@@ -3930,16 +3960,6 @@ no_journal:
 	} else
 		descr = "out journal";
 
-#ifdef CONFIG_QUOTA
-	/* Enable quota usage during mount. */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
-	    !(sb->s_flags & MS_RDONLY)) {
-		err = ext4_enable_quotas(sb);
-		if (err)
-			goto failed_mount8;
-	}
-#endif  /* CONFIG_QUOTA */
-
 	if (test_opt(sb, DISCARD)) {
 		struct request_queue *q = bdev_get_queue(sb->s_bdev);
 		if (!blk_queue_discard(q))
@@ -3993,6 +4013,7 @@ failed_mount3:
 	percpu_counter_destroy(&sbi->s_freeinodes_counter);
 	percpu_counter_destroy(&sbi->s_dirs_counter);
 	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
+	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
 	if (sbi->s_mmp_tsk)
 		kthread_stop(sbi->s_mmp_tsk);
 failed_mount2:
@@ -4538,6 +4559,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 			if (!old_opts.s_qf_names[i]) {
 				for (j = 0; j < i; j++)
 					kfree(old_opts.s_qf_names[j]);
+				kfree(orig_data);
 				return -ENOMEM;
 			}
 		} else
@@ -4816,9 +4838,12 @@ static int ext4_release_dquot(struct dquot *dquot)
 
 static int ext4_mark_dquot_dirty(struct dquot *dquot)
 {
+	struct super_block *sb = dquot->dq_sb;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+
 	/* Are we journaling quotas? */
-	if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
-	    EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
+	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
 		dquot_mark_dquot_dirty(dquot);
 		return ext4_write_dquot(dquot);
 	} else {