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()

7 files changed, 66 insertions, 53 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 2f2e0da1a6b7..92e68b33fffd 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -635,7 +635,7 @@ ext4_fsblk_t ext4_count_free_clusters(struct super_block *sb)
         brelse(bitmap_bh);
         printk(KERN_DEBUG "ext4_count_free_clusters: stored = %llu"
                ", computed = %llu, %llu\n",
-               EXT4_B2C(EXT4_SB(sb), ext4_free_blocks_count(es)),
+               EXT4_NUM_B2C(EXT4_SB(sb), ext4_free_blocks_count(es)),
                desc_count, bitmap_count);
         return bitmap_count;
 #else
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 6dda04f05ef4..d8cd1f0f4661 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -334,7 +334,7 @@ static inline loff_t ext4_get_htree_eof(struct file *filp)
  *
  * For non-htree, ext4_llseek already chooses the proper max offset.
  */
-loff_t ext4_dir_llseek(struct file *file, loff_t offset, int whence)
+static loff_t ext4_dir_llseek(struct file *file, loff_t offset, int whence)
 {
         struct inode *inode = file->f_mapping->host;
         int dx_dir = is_dx_dir(inode);
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 6e16c1867959..4a01ba315262 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1309,6 +1309,7 @@ struct ext4_sb_info {
         /* Reclaim extents from extent status tree */
         struct shrinker s_es_shrinker;
         struct list_head s_es_lru;
+        struct percpu_counter s_extent_cache_cnt;
         spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
 };
 
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index f768f4a98a2b..95796a1b7522 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -147,11 +147,12 @@ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
                               ext4_lblk_t end);
 static int __es_try_to_reclaim_extents(struct ext4_inode_info *ei,
                                        int nr_to_scan);
-static int ext4_es_reclaim_extents_count(struct super_block *sb);
 
 int __init ext4_init_es(void)
 {
-        ext4_es_cachep = KMEM_CACHE(extent_status, SLAB_RECLAIM_ACCOUNT);
+        ext4_es_cachep = kmem_cache_create("ext4_extent_status",
+                                           sizeof(struct extent_status),
+                                           0, (SLAB_RECLAIM_ACCOUNT), NULL);
         if (ext4_es_cachep == NULL)
                 return -ENOMEM;
         return 0;
@@ -302,8 +303,10 @@ ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
         /*
          * We don't count delayed extent because we never try to reclaim them
          */
-        if (!ext4_es_is_delayed(es))
+        if (!ext4_es_is_delayed(es)) {
                 EXT4_I(inode)->i_es_lru_nr++;
+                percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_extent_cache_cnt);
+        }
 
         return es;
 }
@@ -314,6 +317,7 @@ static void ext4_es_free_extent(struct inode *inode, struct extent_status *es)
         if (!ext4_es_is_delayed(es)) {
                 BUG_ON(EXT4_I(inode)->i_es_lru_nr == 0);
                 EXT4_I(inode)->i_es_lru_nr--;
+                percpu_counter_dec(&EXT4_SB(inode->i_sb)->s_extent_cache_cnt);
         }
 
         kmem_cache_free(ext4_es_cachep, es);
@@ -674,10 +678,11 @@ static int ext4_es_shrink(struct shrinker *shrink, struct shrink_control *sc)
         int nr_to_scan = sc->nr_to_scan;
         int ret, nr_shrunk = 0;
 
-        trace_ext4_es_shrink_enter(sbi->s_sb, nr_to_scan);
+        ret = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
+        trace_ext4_es_shrink_enter(sbi->s_sb, nr_to_scan, ret);
 
         if (!nr_to_scan)
-                return ext4_es_reclaim_extents_count(sbi->s_sb);
+                return ret;
 
         INIT_LIST_HEAD(&scanned);
 
@@ -705,9 +710,10 @@ static int ext4_es_shrink(struct shrinker *shrink, struct shrink_control *sc)
         }
         list_splice_tail(&scanned, &sbi->s_es_lru);
         spin_unlock(&sbi->s_es_lru_lock);
-        trace_ext4_es_shrink_exit(sbi->s_sb, nr_shrunk);
 
-        return ext4_es_reclaim_extents_count(sbi->s_sb);
+        ret = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
+        trace_ext4_es_shrink_exit(sbi->s_sb, nr_shrunk, ret);
+        return ret;
 }
 
 void ext4_es_register_shrinker(struct super_block *sb)
@@ -751,25 +757,6 @@ void ext4_es_lru_del(struct inode *inode)
         spin_unlock(&sbi->s_es_lru_lock);
 }
 
-static int ext4_es_reclaim_extents_count(struct super_block *sb)
-{
-        struct ext4_sb_info *sbi = EXT4_SB(sb);
-        struct ext4_inode_info *ei;
-        struct list_head *cur;
-        int nr_cached = 0;
-
-        spin_lock(&sbi->s_es_lru_lock);
-        list_for_each(cur, &sbi->s_es_lru) {
-                ei = list_entry(cur, struct ext4_inode_info, i_es_lru);
-                read_lock(&ei->i_es_lock);
-                nr_cached += ei->i_es_lru_nr;
-                read_unlock(&ei->i_es_lock);
-        }
-        spin_unlock(&sbi->s_es_lru_lock);
-        trace_ext4_es_reclaim_extents_count(sb, nr_cached);
-        return nr_cached;
-}
-
 static int __es_try_to_reclaim_extents(struct ext4_inode_info *ei,
                                        int nr_to_scan)
 {
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6540ebe058e3..7bb713a46fe4 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3419,7 +3419,7 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
                         win = offs;
 
                 ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical -
-                        EXT4_B2C(sbi, win);
+                        EXT4_NUM_B2C(sbi, win);
                 BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical);
                 BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len);
         }
@@ -4565,7 +4565,7 @@ do_more:
                         EXT4_BLOCKS_PER_GROUP(sb);
                 count -= overflow;
         }
-        count_clusters = EXT4_B2C(sbi, count);
+        count_clusters = EXT4_NUM_B2C(sbi, count);
         bitmap_bh = ext4_read_block_bitmap(sb, block_group);
         if (!bitmap_bh) {
                 err = -EIO;
@@ -4807,11 +4807,11 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
         ext4_group_desc_csum_set(sb, block_group, desc);
         ext4_unlock_group(sb, block_group);
         percpu_counter_add(&sbi->s_freeclusters_counter,
-                           EXT4_B2C(sbi, blocks_freed));
+                           EXT4_NUM_B2C(sbi, blocks_freed));
 
         if (sbi->s_log_groups_per_flex) {
                 ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
-                atomic_add(EXT4_B2C(sbi, blocks_freed),
+                atomic_add(EXT4_NUM_B2C(sbi, blocks_freed),
                            &sbi->s_flex_groups[flex_group].free_clusters);
         }
 
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index c7f4d7584669..b2c8ee56eb98 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1247,7 +1247,7 @@ static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
 
                 ext4_inode_table_set(sb, gdp, group_data->inode_table);
                 ext4_free_group_clusters_set(sb, gdp,
-                                             EXT4_B2C(sbi, group_data->free_blocks_count));
+                        EXT4_NUM_B2C(sbi, group_data->free_blocks_count));
                 ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
                 if (ext4_has_group_desc_csum(sb))
                         ext4_itable_unused_set(sb, gdp,
@@ -1349,7 +1349,7 @@ static void ext4_update_super(struct super_block *sb,
 
         /* Update the free space counts */
         percpu_counter_add(&sbi->s_freeclusters_counter,
-                           EXT4_B2C(sbi, free_blocks));
+                           EXT4_NUM_B2C(sbi, free_blocks));
         percpu_counter_add(&sbi->s_freeinodes_counter,
                            EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
 
@@ -1360,7 +1360,7 @@ static void ext4_update_super(struct super_block *sb,
             sbi->s_log_groups_per_flex) {
                 ext4_group_t flex_group;
                 flex_group = ext4_flex_group(sbi, group_data[0].group);
-                atomic_add(EXT4_B2C(sbi, free_blocks),
+                atomic_add(EXT4_NUM_B2C(sbi, free_blocks),
                            &sbi->s_flex_groups[flex_group].free_clusters);
                 atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
                            &sbi->s_flex_groups[flex_group].free_inodes);
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 {