1 files changed, 105 insertions, 26 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 5d6d53578124..dbc7c090c13a 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -81,6 +81,7 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly);
 static void ext4_destroy_lazyinit_thread(void);
 static void ext4_unregister_li_request(struct super_block *sb);
 static void ext4_clear_request_list(void);
+static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
 
 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
 static struct file_system_type ext2_fs_type = {
@@ -353,10 +354,13 @@ static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 	struct super_block		*sb = journal->j_private;
 	struct ext4_sb_info		*sbi = EXT4_SB(sb);
 	int				error = is_journal_aborted(journal);
-	struct ext4_journal_cb_entry	*jce, *tmp;
+	struct ext4_journal_cb_entry	*jce;
 
+	BUG_ON(txn->t_state == T_FINISHED);
 	spin_lock(&sbi->s_md_lock);
-	list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
+	while (!list_empty(&txn->t_private_list)) {
+		jce = list_entry(txn->t_private_list.next,
+				 struct ext4_journal_cb_entry, jce_list);
 		list_del_init(&jce->jce_list);
 		spin_unlock(&sbi->s_md_lock);
 		jce->jce_func(sb, jce, error);
@@ -1948,16 +1952,16 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	if ((sbi->s_es->s_feature_ro_compat &
 	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
 		/* Use new metadata_csum algorithm */
-		__u16 old_csum;
+		__le16 save_csum;
 		__u32 csum32;
 
-		old_csum = gdp->bg_checksum;
+		save_csum = gdp->bg_checksum;
 		gdp->bg_checksum = 0;
 		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
 				     sizeof(le_group));
 		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
 				     sbi->s_desc_size);
-		gdp->bg_checksum = old_csum;
+		gdp->bg_checksum = save_csum;
 
 		crc = csum32 & 0xFFFF;
 		goto out;
@@ -2379,17 +2383,15 @@ struct ext4_attr {
 	int offset;
 };
 
-static int parse_strtoul(const char *buf,
-		unsigned long max, unsigned long *value)
+static int parse_strtoull(const char *buf,
+		unsigned long long max, unsigned long long *value)
 {
-	char *endp;
-
-	*value = simple_strtoul(skip_spaces(buf), &endp, 0);
-	endp = skip_spaces(endp);
-	if (*endp || *value > max)
-		return -EINVAL;
+	int ret;
 
-	return 0;
+	ret = kstrtoull(skip_spaces(buf), 0, value);
+	if (!ret && *value > max)
+		ret = -EINVAL;
+	return ret;
 }
 
 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
@@ -2431,11 +2433,13 @@ static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
 					  const char *buf, size_t count)
 {
 	unsigned long t;
+	int ret;
 
-	if (parse_strtoul(buf, 0x40000000, &t))
-		return -EINVAL;
+	ret = kstrtoul(skip_spaces(buf), 0, &t);
+	if (ret)
+		return ret;
 
-	if (t && !is_power_of_2(t))
+	if (t && (!is_power_of_2(t) || t > 0x40000000))
 		return -EINVAL;
 
 	sbi->s_inode_readahead_blks = t;
@@ -2456,13 +2460,36 @@ static ssize_t sbi_ui_store(struct ext4_attr *a,
 {
 	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
 	unsigned long t;
+	int ret;
 
-	if (parse_strtoul(buf, 0xffffffff, &t))
-		return -EINVAL;
+	ret = kstrtoul(skip_spaces(buf), 0, &t);
+	if (ret)
+		return ret;
 	*ui = t;
 	return count;
 }
 
+static ssize_t reserved_clusters_show(struct ext4_attr *a,
+				  struct ext4_sb_info *sbi, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%llu\n",
+		(unsigned long long) atomic64_read(&sbi->s_resv_clusters));
+}
+
+static ssize_t reserved_clusters_store(struct ext4_attr *a,
+				   struct ext4_sb_info *sbi,
+				   const char *buf, size_t count)
+{
+	unsigned long long val;
+	int ret;
+
+	if (parse_strtoull(buf, -1ULL, &val))
+		return -EINVAL;
+	ret = ext4_reserve_clusters(sbi, val);
+
+	return ret ? ret : count;
+}
+
 static ssize_t trigger_test_error(struct ext4_attr *a,
 				  struct ext4_sb_info *sbi,
 				  const char *buf, size_t count)
@@ -2500,6 +2527,7 @@ static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
 EXT4_RO_ATTR(delayed_allocation_blocks);
 EXT4_RO_ATTR(session_write_kbytes);
 EXT4_RO_ATTR(lifetime_write_kbytes);
+EXT4_RW_ATTR(reserved_clusters);
 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
 		 inode_readahead_blks_store, s_inode_readahead_blks);
 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
@@ -2517,6 +2545,7 @@ static struct attribute *ext4_attrs[] = {
 	ATTR_LIST(delayed_allocation_blocks),
 	ATTR_LIST(session_write_kbytes),
 	ATTR_LIST(lifetime_write_kbytes),
+	ATTR_LIST(reserved_clusters),
 	ATTR_LIST(inode_readahead_blks),
 	ATTR_LIST(inode_goal),
 	ATTR_LIST(mb_stats),
@@ -3192,6 +3221,40 @@ int ext4_calculate_overhead(struct super_block *sb)
 	return 0;
 }
 
+
+static ext4_fsblk_t ext4_calculate_resv_clusters(struct ext4_sb_info *sbi)
+{
+	ext4_fsblk_t resv_clusters;
+
+	/*
+	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
+	 * This should cover the situations where we can not afford to run
+	 * out of space like for example punch hole, or converting
+	 * uninitialized extents in delalloc path. In most cases such
+	 * allocation would require 1, or 2 blocks, higher numbers are
+	 * very rare.
+	 */
+	resv_clusters = ext4_blocks_count(sbi->s_es) >> sbi->s_cluster_bits;
+
+	do_div(resv_clusters, 50);
+	resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
+
+	return resv_clusters;
+}
+
+
+static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
+{
+	ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
+				sbi->s_cluster_bits;
+
+	if (count >= clusters)
+		return -EINVAL;
+
+	atomic64_set(&sbi->s_resv_clusters, count);
+	return 0;
+}
+
 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 {
 	char *orig_data = kstrdup(data, GFP_KERNEL);
@@ -3526,6 +3589,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
 	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
 
+	/* Do we have standard group size of blocksize * 8 blocks ? */
+	if (sbi->s_blocks_per_group == blocksize << 3)
+		set_opt2(sb, STD_GROUP_SIZE);
+
 	for (i = 0; i < 4; i++)
 		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
 	sbi->s_def_hash_version = es->s_def_hash_version;
@@ -3698,6 +3765,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_err_report.function = print_daily_error_info;
 	sbi->s_err_report.data = (unsigned long) sb;
 
+	/* Register extent status tree shrinker */
+	ext4_es_register_shrinker(sb);
+
 	err = percpu_counter_init(&sbi->s_freeclusters_counter,
 			ext4_count_free_clusters(sb));
 	if (!err) {
@@ -3723,9 +3793,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_max_writeback_mb_bump = 128;
 	sbi->s_extent_max_zeroout_kb = 32;
 
-	/* Register extent status tree shrinker */
-	ext4_es_register_shrinker(sb);
-
 	/*
 	 * set up enough so that it can read an inode
 	 */
@@ -3911,6 +3978,13 @@ no_journal:
 			 "available");
 	}
 
+	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sbi));
+	if (err) {
+		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
+			 "reserved pool", ext4_calculate_resv_clusters(sbi));
+		goto failed_mount4a;
+	}
+
 	err = ext4_setup_system_zone(sb);
 	if (err) {
 		ext4_msg(sb, KERN_ERR, "failed to initialize system "
@@ -4010,6 +4084,7 @@ failed_mount_wq:
 		sbi->s_journal = NULL;
 	}
 failed_mount3:
+	ext4_es_unregister_shrinker(sb);
 	del_timer(&sbi->s_err_report);
 	if (sbi->s_flex_groups)
 		ext4_kvfree(sbi->s_flex_groups);
@@ -4177,7 +4252,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
 		goto out_bdev;
 	}
 	journal->j_private = sb;
-	ll_rw_block(READ, 1, &journal->j_sb_buffer);
+	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
 	wait_on_buffer(journal->j_sb_buffer);
 	if (!buffer_uptodate(journal->j_sb_buffer)) {
 		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
@@ -4742,9 +4817,10 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
 	struct super_block *sb = dentry->d_sb;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	struct ext4_super_block *es = sbi->s_es;
-	ext4_fsblk_t overhead = 0;
+	ext4_fsblk_t overhead = 0, resv_blocks;
 	u64 fsid;
 	s64 bfree;
+	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
 
 	if (!test_opt(sb, MINIX_DF))
 		overhead = sbi->s_overhead;
@@ -4756,8 +4832,9 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
 		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
 	/* prevent underflow in case that few free space is available */
 	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
-	buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
-	if (buf->f_bfree < ext4_r_blocks_count(es))
+	buf->f_bavail = buf->f_bfree -
+			(ext4_r_blocks_count(es) + resv_blocks);
+	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
 		buf->f_bavail = 0;
 	buf->f_files = le32_to_cpu(es->s_inodes_count);
 	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
@@ -4945,6 +5022,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
 		return PTR_ERR(qf_inode);
 	}
 
+	/* Don't account quota for quota files to avoid recursion */
+	qf_inode->i_flags |= S_NOQUOTA;
 	err = dquot_enable(qf_inode, type, format_id, flags);
 	iput(qf_inode);