Linux-libre 4.4-gnupck-4.4-gnu

1 files changed, 143 insertions, 548 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index df84bd256..c9ab67da6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -34,7 +34,6 @@
 #include <linux/namei.h>
 #include <linux/quotaops.h>
 #include <linux/seq_file.h>
-#include <linux/proc_fs.h>
 #include <linux/ctype.h>
 #include <linux/log2.h>
 #include <linux/crc16.h>
@@ -54,11 +53,8 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/ext4.h>
 
-static struct proc_dir_entry *ext4_proc_root;
-static struct kset *ext4_kset;
 static struct ext4_lazy_init *ext4_li_info;
 static struct mutex ext4_li_mtx;
-static struct ext4_features *ext4_feat;
 static int ext4_mballoc_ready;
 static struct ratelimit_state ext4_mount_msg_ratelimit;
 
@@ -83,7 +79,6 @@ 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_EXT2)
 static struct file_system_type ext2_fs_type = {
@@ -115,8 +110,7 @@ MODULE_ALIAS("ext3");
 static int ext4_verify_csum_type(struct super_block *sb,
 				 struct ext4_super_block *es)
 {
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_feature_metadata_csum(sb))
 		return 1;
 
 	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
@@ -499,6 +493,12 @@ const char *ext4_decode_error(struct super_block *sb, int errno,
 	char *errstr = NULL;
 
 	switch (errno) {
+	case -EFSCORRUPTED:
+		errstr = "Corrupt filesystem";
+		break;
+	case -EFSBADCRC:
+		errstr = "Filesystem failed CRC";
+		break;
 	case -EIO:
 		errstr = "IO failure";
 		break;
@@ -808,6 +808,7 @@ static void ext4_put_super(struct super_block *sb)
 			ext4_abort(sb, "Couldn't clean up the journal");
 	}
 
+	ext4_unregister_sysfs(sb);
 	ext4_es_unregister_shrinker(sbi);
 	del_timer_sync(&sbi->s_err_report);
 	ext4_release_system_zone(sb);
@@ -816,18 +817,12 @@ static void ext4_put_super(struct super_block *sb)
 	ext4_xattr_put_super(sb);
 
 	if (!(sb->s_flags & MS_RDONLY)) {
-		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+		ext4_clear_feature_journal_needs_recovery(sb);
 		es->s_state = cpu_to_le16(sbi->s_mount_state);
 	}
 	if (!(sb->s_flags & MS_RDONLY))
 		ext4_commit_super(sb, 1);
 
-	if (sbi->s_proc) {
-		remove_proc_entry("options", sbi->s_proc);
-		remove_proc_entry(sb->s_id, ext4_proc_root);
-	}
-	kobject_del(&sbi->s_kobj);
-
 	for (i = 0; i < sbi->s_gdb_count; i++)
 		brelse(sbi->s_group_desc[i]);
 	kvfree(sbi->s_group_desc);
@@ -1066,7 +1061,7 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 		return 0;
 	if (journal)
 		return jbd2_journal_try_to_free_buffers(journal, page,
-							wait & ~__GFP_WAIT);
+						wait & ~__GFP_DIRECT_RECLAIM);
 	return try_to_free_buffers(page);
 }
 
@@ -1296,7 +1291,7 @@ 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)) {
+	if (ext4_has_feature_quota(sb)) {
 		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
 			 "when QUOTA feature is enabled");
 		return -1;
@@ -1389,10 +1384,10 @@ static const struct mount_opts {
 	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
 	 MOPT_EXT4_ONLY | MOPT_CLEAR},
 	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
-	 MOPT_EXT4_ONLY | MOPT_SET},
+	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
 	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
 				    EXT4_MOUNT_JOURNAL_CHECKSUM),
-	 MOPT_EXT4_ONLY | MOPT_SET},
+	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
 	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
 	{Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
 	{Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
@@ -1521,8 +1516,14 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 		return -1;
 	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
 		return -1;
-	if (m->flags & MOPT_EXPLICIT)
-		set_opt2(sb, EXPLICIT_DELALLOC);
+	if (m->flags & MOPT_EXPLICIT) {
+		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
+			set_opt2(sb, EXPLICIT_DELALLOC);
+		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
+			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
+		} else
+			return -1;
+	}
 	if (m->flags & MOPT_CLEAR_ERR)
 		clear_opt(sb, ERRORS_MASK);
 	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
@@ -1655,8 +1656,7 @@ 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)) {
+		if (ext4_has_feature_quota(sb)) {
 			ext4_msg(sb, KERN_ERR,
 				 "Cannot set journaled quota options "
 				 "when QUOTA feature is enabled");
@@ -1664,8 +1664,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 		}
 		sbi->s_jquota_fmt = m->mount_opt;
 #endif
-#ifndef CONFIG_FS_DAX
 	} else if (token == Opt_dax) {
+#ifdef CONFIG_FS_DAX
+		ext4_msg(sb, KERN_WARNING,
+		"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
+			sbi->s_mount_opt |= m->mount_opt;
+#else
 		ext4_msg(sb, KERN_INFO, "dax option not supported");
 		return -1;
 #endif
@@ -1715,7 +1719,7 @@ 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) &&
+	if (ext4_has_feature_quota(sb) &&
 	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
 		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
 			 "feature is enabled");
@@ -1888,7 +1892,7 @@ static int ext4_show_options(struct seq_file *seq, struct dentry *root)
 	return _ext4_show_options(seq, root->d_sb, 0);
 }
 
-static int options_seq_show(struct seq_file *seq, void *offset)
+int ext4_seq_options_show(struct seq_file *seq, void *offset)
 {
 	struct super_block *sb = seq->private;
 	int rc;
@@ -1899,19 +1903,6 @@ static int options_seq_show(struct seq_file *seq, void *offset)
 	return rc;
 }
 
-static int options_open_fs(struct inode *inode, struct file *file)
-{
-	return single_open(file, options_seq_show, PDE_DATA(inode));
-}
-
-static const struct file_operations ext4_seq_options_fops = {
-	.owner = THIS_MODULE,
-	.open = options_open_fs,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
-
 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
 			    int read_only)
 {
@@ -1952,7 +1943,7 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
 	es->s_mtime = cpu_to_le32(get_seconds());
 	ext4_update_dynamic_rev(sb);
 	if (sbi->s_journal)
-		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+		ext4_set_feature_journal_needs_recovery(sb);
 
 	ext4_commit_super(sb, 1);
 done:
@@ -2035,12 +2026,13 @@ failed:
 	return 0;
 }
 
-static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
+static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
 				   struct ext4_group_desc *gdp)
 {
 	int offset;
 	__u16 crc = 0;
 	__le32 le_group = cpu_to_le32(block_group);
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
 	if (ext4_has_metadata_csum(sbi->s_sb)) {
 		/* Use new metadata_csum algorithm */
@@ -2060,8 +2052,7 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	}
 
 	/* old crc16 code */
-	if (!(sbi->s_es->s_feature_ro_compat &
-	      cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
+	if (!ext4_has_feature_gdt_csum(sb))
 		return 0;
 
 	offset = offsetof(struct ext4_group_desc, bg_checksum);
@@ -2071,8 +2062,7 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	crc = crc16(crc, (__u8 *)gdp, offset);
 	offset += sizeof(gdp->bg_checksum); /* skip checksum */
 	/* for checksum of struct ext4_group_desc do the rest...*/
-	if ((sbi->s_es->s_feature_incompat &
-	     cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
+	if (ext4_has_feature_64bit(sb) &&
 	    offset < le16_to_cpu(sbi->s_es->s_desc_size))
 		crc = crc16(crc, (__u8 *)gdp + offset,
 			    le16_to_cpu(sbi->s_es->s_desc_size) -
@@ -2086,8 +2076,7 @@ int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
 				struct ext4_group_desc *gdp)
 {
 	if (ext4_has_group_desc_csum(sb) &&
-	    (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
-						      block_group, gdp)))
+	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
 		return 0;
 
 	return 1;
@@ -2098,7 +2087,7 @@ void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
 {
 	if (!ext4_has_group_desc_csum(sb))
 		return;
-	gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
+	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
 }
 
 /* Called at mount-time, super-block is locked */
@@ -2114,7 +2103,7 @@ static int ext4_check_descriptors(struct super_block *sb,
 	int flexbg_flag = 0;
 	ext4_group_t i, grp = sbi->s_groups_count;
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+	if (ext4_has_feature_flex_bg(sb))
 		flexbg_flag = 1;
 
 	ext4_debug("Checking group descriptors");
@@ -2158,7 +2147,7 @@ static int ext4_check_descriptors(struct super_block *sb,
 		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
 			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
 				 "Checksum for group %u failed (%u!=%u)",
-				 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
+				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
 				     gdp)), le16_to_cpu(gdp->bg_checksum));
 			if (!(sb->s_flags & MS_RDONLY)) {
 				ext4_unlock_group(sb, i);
@@ -2421,8 +2410,7 @@ static ext4_fsblk_t descriptor_loc(struct super_block *sb,
 
 	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
 
-	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
-	    nr < first_meta_bg)
+	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
 		return logical_sb_block + nr + 1;
 	bg = sbi->s_desc_per_block * nr;
 	if (ext4_bg_has_super(sb, bg))
@@ -2478,335 +2466,6 @@ static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
 	return ret;
 }
 
-/* sysfs supprt */
-
-struct ext4_attr {
-	struct attribute attr;
-	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
-	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
-			 const char *, size_t);
-	union {
-		int offset;
-		int deprecated_val;
-	} u;
-};
-
-static int parse_strtoull(const char *buf,
-		unsigned long long max, unsigned long long *value)
-{
-	int ret;
-
-	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,
-					      struct ext4_sb_info *sbi,
-					      char *buf)
-{
-	return snprintf(buf, PAGE_SIZE, "%llu\n",
-		(s64) EXT4_C2B(sbi,
-			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
-}
-
-static ssize_t session_write_kbytes_show(struct ext4_attr *a,
-					 struct ext4_sb_info *sbi, char *buf)
-{
-	struct super_block *sb = sbi->s_buddy_cache->i_sb;
-
-	if (!sb->s_bdev->bd_part)
-		return snprintf(buf, PAGE_SIZE, "0\n");
-	return snprintf(buf, PAGE_SIZE, "%lu\n",
-			(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
-			 sbi->s_sectors_written_start) >> 1);
-}
-
-static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
-					  struct ext4_sb_info *sbi, char *buf)
-{
-	struct super_block *sb = sbi->s_buddy_cache->i_sb;
-
-	if (!sb->s_bdev->bd_part)
-		return snprintf(buf, PAGE_SIZE, "0\n");
-	return snprintf(buf, PAGE_SIZE, "%llu\n",
-			(unsigned long long)(sbi->s_kbytes_written +
-			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
-			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
-}
-
-static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
-					  struct ext4_sb_info *sbi,
-					  const char *buf, size_t count)
-{
-	unsigned long t;
-	int ret;
-
-	ret = kstrtoul(skip_spaces(buf), 0, &t);
-	if (ret)
-		return ret;
-
-	if (t && (!is_power_of_2(t) || t > 0x40000000))
-		return -EINVAL;
-
-	sbi->s_inode_readahead_blks = t;
-	return count;
-}
-
-static ssize_t sbi_ui_show(struct ext4_attr *a,
-			   struct ext4_sb_info *sbi, char *buf)
-{
-	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
-
-	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
-}
-
-static ssize_t sbi_ui_store(struct ext4_attr *a,
-			    struct ext4_sb_info *sbi,
-			    const char *buf, size_t count)
-{
-	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
-	unsigned long t;
-	int ret;
-
-	ret = kstrtoul(skip_spaces(buf), 0, &t);
-	if (ret)
-		return ret;
-	*ui = t;
-	return count;
-}
-
-static ssize_t es_ui_show(struct ext4_attr *a,
-			   struct ext4_sb_info *sbi, char *buf)
-{
-
-	unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
-			   a->u.offset);
-
-	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
-}
-
-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)
-{
-	int len = count;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	if (len && buf[len-1] == '\n')
-		len--;
-
-	if (len)
-		ext4_error(sbi->s_sb, "%.*s", len, buf);
-	return count;
-}
-
-static ssize_t sbi_deprecated_show(struct ext4_attr *a,
-				   struct ext4_sb_info *sbi, char *buf)
-{
-	return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
-}
-
-#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
-static struct ext4_attr ext4_attr_##_name = {			\
-	.attr = {.name = __stringify(_name), .mode = _mode },	\
-	.show	= _show,					\
-	.store	= _store,					\
-	.u = {							\
-		.offset = offsetof(struct ext4_sb_info, _elname),\
-	},							\
-}
-
-#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname)		\
-static struct ext4_attr ext4_attr_##_name = {				\
-	.attr = {.name = __stringify(_name), .mode = _mode },		\
-	.show	= _show,						\
-	.store	= _store,						\
-	.u = {								\
-		.offset = offsetof(struct ext4_super_block, _elname),	\
-	},								\
-}
-
-#define EXT4_ATTR(name, mode, show, store) \
-static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
-
-#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
-#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
-#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
-
-#define EXT4_RO_ATTR_ES_UI(name, elname)	\
-	EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
-#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
-	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
-
-#define ATTR_LIST(name) &ext4_attr_##name.attr
-#define EXT4_DEPRECATED_ATTR(_name, _val)	\
-static struct ext4_attr ext4_attr_##_name = {			\
-	.attr = {.name = __stringify(_name), .mode = 0444 },	\
-	.show	= sbi_deprecated_show,				\
-	.u = {							\
-		.deprecated_val = _val,				\
-	},							\
-}
-
-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);
-EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
-EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
-EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
-EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
-EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
-EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
-EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
-EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
-EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
-EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
-EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
-EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
-EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
-EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
-EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
-EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
-
-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),
-	ATTR_LIST(mb_max_to_scan),
-	ATTR_LIST(mb_min_to_scan),
-	ATTR_LIST(mb_order2_req),
-	ATTR_LIST(mb_stream_req),
-	ATTR_LIST(mb_group_prealloc),
-	ATTR_LIST(max_writeback_mb_bump),
-	ATTR_LIST(extent_max_zeroout_kb),
-	ATTR_LIST(trigger_fs_error),
-	ATTR_LIST(err_ratelimit_interval_ms),
-	ATTR_LIST(err_ratelimit_burst),
-	ATTR_LIST(warning_ratelimit_interval_ms),
-	ATTR_LIST(warning_ratelimit_burst),
-	ATTR_LIST(msg_ratelimit_interval_ms),
-	ATTR_LIST(msg_ratelimit_burst),
-	ATTR_LIST(errors_count),
-	ATTR_LIST(first_error_time),
-	ATTR_LIST(last_error_time),
-	NULL,
-};
-
-/* Features this copy of ext4 supports */
-EXT4_INFO_ATTR(lazy_itable_init);
-EXT4_INFO_ATTR(batched_discard);
-EXT4_INFO_ATTR(meta_bg_resize);
-EXT4_INFO_ATTR(encryption);
-
-static struct attribute *ext4_feat_attrs[] = {
-	ATTR_LIST(lazy_itable_init),
-	ATTR_LIST(batched_discard),
-	ATTR_LIST(meta_bg_resize),
-	ATTR_LIST(encryption),
-	NULL,
-};
-
-static ssize_t ext4_attr_show(struct kobject *kobj,
-			      struct attribute *attr, char *buf)
-{
-	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
-						s_kobj);
-	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
-
-	return a->show ? a->show(a, sbi, buf) : 0;
-}
-
-static ssize_t ext4_attr_store(struct kobject *kobj,
-			       struct attribute *attr,
-			       const char *buf, size_t len)
-{
-	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
-						s_kobj);
-	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
-
-	return a->store ? a->store(a, sbi, buf, len) : 0;
-}
-
-static void ext4_sb_release(struct kobject *kobj)
-{
-	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
-						s_kobj);
-	complete(&sbi->s_kobj_unregister);
-}
-
-static const struct sysfs_ops ext4_attr_ops = {
-	.show	= ext4_attr_show,
-	.store	= ext4_attr_store,
-};
-
-static struct kobj_type ext4_ktype = {
-	.default_attrs	= ext4_attrs,
-	.sysfs_ops	= &ext4_attr_ops,
-	.release	= ext4_sb_release,
-};
-
-static void ext4_feat_release(struct kobject *kobj)
-{
-	complete(&ext4_feat->f_kobj_unregister);
-}
-
-static ssize_t ext4_feat_show(struct kobject *kobj,
-			      struct attribute *attr, char *buf)
-{
-	return snprintf(buf, PAGE_SIZE, "supported\n");
-}
-
-/*
- * We can not use ext4_attr_show/store because it relies on the kobject
- * being embedded in the ext4_sb_info structure which is definitely not
- * true in this case.
- */
-static const struct sysfs_ops ext4_feat_ops = {
-	.show	= ext4_feat_show,
-	.store	= NULL,
-};
-
-static struct kobj_type ext4_feat_ktype = {
-	.default_attrs	= ext4_feat_attrs,
-	.sysfs_ops	= &ext4_feat_ops,
-	.release	= ext4_feat_release,
-};
-
 /*
  * Check whether this filesystem can be mounted based on
  * the features present and the RDONLY/RDWR mount requested.
@@ -2815,7 +2474,7 @@ static struct kobj_type ext4_feat_ktype = {
  */
 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 {
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
+	if (ext4_has_unknown_ext4_incompat_features(sb)) {
 		ext4_msg(sb, KERN_ERR,
 			"Couldn't mount because of "
 			"unsupported optional features (%x)",
@@ -2827,14 +2486,14 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 	if (readonly)
 		return 1;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
+	if (ext4_has_feature_readonly(sb)) {
 		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
 		sb->s_flags |= MS_RDONLY;
 		return 1;
 	}
 
 	/* Check that feature set is OK for a read-write mount */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
+	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
 		ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
 			 "unsupported optional features (%x)",
 			 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
@@ -2845,7 +2504,7 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 	 * Large file size enabled file system can only be mounted
 	 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
 	 */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
+	if (ext4_has_feature_huge_file(sb)) {
 		if (sizeof(blkcnt_t) < sizeof(u64)) {
 			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
 				 "cannot be mounted RDWR without "
@@ -2853,8 +2512,7 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 			return 0;
 		}
 	}
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
-	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
+	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
 		ext4_msg(sb, KERN_ERR,
 			 "Can't support bigalloc feature without "
 			 "extents feature\n");
@@ -2862,8 +2520,7 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 	}
 
 #ifndef CONFIG_QUOTA
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
-	    !readonly) {
+	if (ext4_has_feature_quota(sb) && !readonly) {
 		ext4_msg(sb, KERN_ERR,
 			 "Filesystem with quota feature cannot be mounted RDWR "
 			 "without CONFIG_QUOTA");
@@ -3320,7 +2977,7 @@ static int count_overhead(struct super_block *sb, ext4_group_t grp,
 	ext4_group_t		i, ngroups = ext4_get_groups_count(sb);
 	int			s, j, count = 0;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+	if (!ext4_has_feature_bigalloc(sb))
 		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
 			sbi->s_itb_per_group + 2);
 
@@ -3411,10 +3068,10 @@ int ext4_calculate_overhead(struct super_block *sb)
 	return 0;
 }
 
-
-static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
+static void ext4_set_resv_clusters(struct super_block *sb)
 {
 	ext4_fsblk_t resv_clusters;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
 	/*
 	 * There's no need to reserve anything when we aren't using extents.
@@ -3422,8 +3079,8 @@ static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
 	 * hole punching doesn't need new metadata... This is needed especially
 	 * to keep ext2/3 backward compatibility.
 	 */
-	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
-		return 0;
+	if (!ext4_has_feature_extents(sb))
+		return;
 	/*
 	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
 	 * This should cover the situations where we can not afford to run
@@ -3432,26 +3089,13 @@ static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
 	 * allocation would require 1, or 2 blocks, higher numbers are
 	 * very rare.
 	 */
-	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
-			EXT4_SB(sb)->s_cluster_bits;
+	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;
+	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
 }
 
 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
@@ -3534,9 +3178,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
 
 	/* Warn if metadata_csum and gdt_csum are both set. */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
-	    EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+	if (ext4_has_feature_metadata_csum(sb) &&
+	    ext4_has_feature_gdt_csum(sb))
 		ext4_warning(sb, "metadata_csum and uninit_bg are "
 			     "redundant flags; please run fsck.");
 
@@ -3549,8 +3192,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	}
 
 	/* Load the checksum driver */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+	if (ext4_has_feature_metadata_csum(sb)) {
 		sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
 		if (IS_ERR(sbi->s_chksum_driver)) {
 			ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
@@ -3565,11 +3207,14 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
 			 "invalid superblock checksum.  Run e2fsck?");
 		silent = 1;
+		ret = -EFSBADCRC;
 		goto cantfind_ext4;
 	}
 
 	/* Precompute checksum seed for all metadata */
-	if (ext4_has_metadata_csum(sb))
+	if (ext4_has_feature_csum_seed(sb))
+		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
+	else if (ext4_has_metadata_csum(sb))
 		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
 					       sizeof(es->s_uuid));
 
@@ -3672,17 +3317,16 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
 
 	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
-	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
-	     EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
-	     EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
+	    (ext4_has_compat_features(sb) ||
+	     ext4_has_ro_compat_features(sb) ||
+	     ext4_has_incompat_features(sb)))
 		ext4_msg(sb, KERN_WARNING,
 		       "feature flags set on rev 0 fs, "
 		       "running e2fsck is recommended");
 
 	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
 		set_opt2(sb, HURD_COMPAT);
-		if (EXT4_HAS_INCOMPAT_FEATURE(sb,
-					      EXT4_FEATURE_INCOMPAT_64BIT)) {
+		if (ext4_has_feature_64bit(sb)) {
 			ext4_msg(sb, KERN_ERR,
 				 "The Hurd can't support 64-bit file systems");
 			goto failed_mount;
@@ -3740,8 +3384,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		}
 	}
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
-	    es->s_encryption_level) {
+	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
 		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
 			 es->s_encryption_level);
 		goto failed_mount;
@@ -3773,8 +3416,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		}
 	}
 
-	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+	has_huge_files = ext4_has_feature_huge_file(sb);
 	sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
 						      has_huge_files);
 	sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
@@ -3798,7 +3440,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	}
 
 	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
+	if (ext4_has_feature_64bit(sb)) {
 		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
 		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
 		    !is_power_of_2(sbi->s_desc_size)) {
@@ -3829,7 +3471,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	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;
-	if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
+	if (ext4_has_feature_dir_index(sb)) {
 		i = le32_to_cpu(es->s_flags);
 		if (i & EXT2_FLAGS_UNSIGNED_HASH)
 			sbi->s_hash_unsigned = 3;
@@ -3849,8 +3491,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 
 	/* Handle clustersize */
 	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
-	has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				EXT4_FEATURE_RO_COMPAT_BIGALLOC);
+	has_bigalloc = ext4_has_feature_bigalloc(sb);
 	if (has_bigalloc) {
 		if (clustersize < blocksize) {
 			ext4_msg(sb, KERN_ERR,
@@ -3969,13 +3610,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		goto failed_mount;
 	}
 
-	if (ext4_proc_root)
-		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
-
-	if (sbi->s_proc)
-		proc_create_data("options", S_IRUGO, sbi->s_proc,
-				 &ext4_seq_options_fops, sb);
-
 	bgl_lock_init(sbi->s_blockgroup_lock);
 
 	for (i = 0; i < db_count; i++) {
@@ -3990,6 +3624,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	}
 	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
 		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
+		ret = -EFSCORRUPTED;
 		goto failed_mount2;
 	}
 
@@ -4015,7 +3650,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_xattr = ext4_xattr_handlers;
 #ifdef CONFIG_QUOTA
 	sb->dq_op = &ext4_quota_operations;
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
+	if (ext4_has_feature_quota(sb))
 		sb->s_qcop = &dquot_quotactl_sysfile_ops;
 	else
 		sb->s_qcop = &ext4_qctl_operations;
@@ -4029,11 +3664,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_root = NULL;
 
 	needs_recovery = (es->s_last_orphan != 0 ||
-			  EXT4_HAS_INCOMPAT_FEATURE(sb,
-				    EXT4_FEATURE_INCOMPAT_RECOVER));
+			  ext4_has_feature_journal_needs_recovery(sb));
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
-	    !(sb->s_flags & MS_RDONLY))
+	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
 		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
 			goto failed_mount3a;
 
@@ -4041,23 +3674,47 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	 * The first inode we look at is the journal inode.  Don't try
 	 * root first: it may be modified in the journal!
 	 */
-	if (!test_opt(sb, NOLOAD) &&
-	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
+	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
 		if (ext4_load_journal(sb, es, journal_devnum))
 			goto failed_mount3a;
 	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
-	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
+		   ext4_has_feature_journal_needs_recovery(sb)) {
 		ext4_msg(sb, KERN_ERR, "required journal recovery "
 		       "suppressed and not mounted read-only");
 		goto failed_mount_wq;
 	} else {
+		/* Nojournal mode, all journal mount options are illegal */
+		if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
+			ext4_msg(sb, KERN_ERR, "can't mount with "
+				 "journal_checksum, fs mounted w/o journal");
+			goto failed_mount_wq;
+		}
+		if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
+			ext4_msg(sb, KERN_ERR, "can't mount with "
+				 "journal_async_commit, fs mounted w/o journal");
+			goto failed_mount_wq;
+		}
+		if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
+			ext4_msg(sb, KERN_ERR, "can't mount with "
+				 "commit=%lu, fs mounted w/o journal",
+				 sbi->s_commit_interval / HZ);
+			goto failed_mount_wq;
+		}
+		if (EXT4_MOUNT_DATA_FLAGS &
+		    (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
+			ext4_msg(sb, KERN_ERR, "can't mount with "
+				 "data=, fs mounted w/o journal");
+			goto failed_mount_wq;
+		}
+		sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
+		clear_opt(sb, JOURNAL_CHECKSUM);
 		clear_opt(sb, DATA_FLAGS);
 		sbi->s_journal = NULL;
 		needs_recovery = 0;
 		goto no_journal;
 	}
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
+	if (ext4_has_feature_64bit(sb) &&
 	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
 				       JBD2_FEATURE_INCOMPAT_64BIT)) {
 		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
@@ -4109,18 +3766,16 @@ no_journal:
 		}
 	}
 
-	if ((DUMMY_ENCRYPTION_ENABLED(sbi) ||
-	     EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) &&
+	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
 	    (blocksize != PAGE_CACHE_SIZE)) {
 		ext4_msg(sb, KERN_ERR,
 			 "Unsupported blocksize for fs encryption");
 		goto failed_mount_wq;
 	}
 
-	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
-	    !(sb->s_flags & MS_RDONLY) &&
-	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
-		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
+	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
+	    !ext4_has_feature_encrypt(sb)) {
+		ext4_set_feature_encrypt(sb);
 		ext4_commit_super(sb, 1);
 	}
 
@@ -4179,8 +3834,7 @@ no_journal:
 	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
 		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
 						     EXT4_GOOD_OLD_INODE_SIZE;
-		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
+		if (ext4_has_feature_extra_isize(sb)) {
 			if (sbi->s_want_extra_isize <
 			    le16_to_cpu(es->s_want_extra_isize))
 				sbi->s_want_extra_isize =
@@ -4200,12 +3854,7 @@ no_journal:
 			 "available");
 	}
 
-	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
-	if (err) {
-		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
-			 "reserved pool", ext4_calculate_resv_clusters(sb));
-		goto failed_mount4a;
-	}
+	ext4_set_resv_clusters(sb);
 
 	err = ext4_setup_system_zone(sb);
 	if (err) {
@@ -4244,7 +3893,7 @@ no_journal:
 		goto failed_mount6;
 	}
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
+	if (ext4_has_feature_flex_bg(sb))
 		if (!ext4_fill_flex_info(sb)) {
 			ext4_msg(sb, KERN_ERR,
 			       "unable to initialize "
@@ -4256,17 +3905,13 @@ no_journal:
 	if (err)
 		goto failed_mount6;
 
-	sbi->s_kobj.kset = ext4_kset;
-	init_completion(&sbi->s_kobj_unregister);
-	err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
-				   "%s", sb->s_id);
+	err = ext4_register_sysfs(sb);
 	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)) {
+	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
 		err = ext4_enable_quotas(sb);
 		if (err)
 			goto failed_mount8;
@@ -4321,7 +3966,7 @@ cantfind_ext4:
 
 #ifdef CONFIG_QUOTA
 failed_mount8:
-	kobject_del(&sbi->s_kobj);
+	ext4_unregister_sysfs(sb);
 #endif
 failed_mount7:
 	ext4_unregister_li_request(sb);
@@ -4361,10 +4006,6 @@ failed_mount2:
 failed_mount:
 	if (sbi->s_chksum_driver)
 		crypto_free_shash(sbi->s_chksum_driver);
-	if (sbi->s_proc) {
-		remove_proc_entry("options", sbi->s_proc);
-		remove_proc_entry(sb->s_id, ext4_proc_root);
-	}
 #ifdef CONFIG_QUOTA
 	for (i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(sbi->s_qf_names[i]);
@@ -4411,7 +4052,7 @@ static journal_t *ext4_get_journal(struct super_block *sb,
 	struct inode *journal_inode;
 	journal_t *journal;
 
-	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+	BUG_ON(!ext4_has_feature_journal(sb));
 
 	/* First, test for the existence of a valid inode on disk.  Bad
 	 * things happen if we iget() an unused inode, as the subsequent
@@ -4461,7 +4102,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
 	struct ext4_super_block *es;
 	struct block_device *bdev;
 
-	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+	BUG_ON(!ext4_has_feature_journal(sb));
 
 	bdev = ext4_blkdev_get(j_dev, sb);
 	if (bdev == NULL)
@@ -4553,7 +4194,7 @@ static int ext4_load_journal(struct super_block *sb,
 	int err = 0;
 	int really_read_only;
 
-	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+	BUG_ON(!ext4_has_feature_journal(sb));
 
 	if (journal_devnum &&
 	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
@@ -4570,7 +4211,7 @@ static int ext4_load_journal(struct super_block *sb,
 	 * crash?  For recovery, we need to check in advance whether we
 	 * can get read-write access to the device.
 	 */
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
+	if (ext4_has_feature_journal_needs_recovery(sb)) {
 		if (sb->s_flags & MS_RDONLY) {
 			ext4_msg(sb, KERN_INFO, "INFO: recovery "
 					"required on readonly filesystem");
@@ -4601,7 +4242,7 @@ static int ext4_load_journal(struct super_block *sb,
 	if (!(journal->j_flags & JBD2_BARRIER))
 		ext4_msg(sb, KERN_INFO, "barriers disabled");
 
-	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
+	if (!ext4_has_feature_journal_needs_recovery(sb))
 		err = jbd2_journal_wipe(journal, !really_read_only);
 	if (!err) {
 		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
@@ -4715,7 +4356,7 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
 {
 	journal_t *journal = EXT4_SB(sb)->s_journal;
 
-	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
+	if (!ext4_has_feature_journal(sb)) {
 		BUG_ON(journal != NULL);
 		return;
 	}
@@ -4723,9 +4364,9 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
 	if (jbd2_journal_flush(journal) < 0)
 		goto out;
 
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
+	if (ext4_has_feature_journal_needs_recovery(sb) &&
 	    sb->s_flags & MS_RDONLY) {
-		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+		ext4_clear_feature_journal_needs_recovery(sb);
 		ext4_commit_super(sb, 1);
 	}
 
@@ -4745,7 +4386,7 @@ static void ext4_clear_journal_err(struct super_block *sb,
 	int j_errno;
 	const char *errstr;
 
-	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
+	BUG_ON(!ext4_has_feature_journal(sb));
 
 	journal = EXT4_SB(sb)->s_journal;
 
@@ -4860,7 +4501,7 @@ static int ext4_freeze(struct super_block *sb)
 			goto out;
 
 		/* Journal blocked and flushed, clear needs_recovery flag. */
-		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+		ext4_clear_feature_journal_needs_recovery(sb);
 	}
 
 	error = ext4_commit_super(sb, 1);
@@ -4882,7 +4523,7 @@ static int ext4_unfreeze(struct super_block *sb)
 
 	if (EXT4_SB(sb)->s_journal) {
 		/* Reset the needs_recovery flag before the fs is unlocked. */
-		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
+		ext4_set_feature_journal_needs_recovery(sb);
 	}
 
 	ext4_commit_super(sb, 1);
@@ -5035,8 +4676,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 				ext4_mark_recovery_complete(sb, es);
 		} else {
 			/* Make sure we can mount this feature set readwrite */
-			if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_READONLY) ||
+			if (ext4_has_feature_readonly(sb) ||
 			    !ext4_feature_set_ok(sb, 0)) {
 				err = -EROFS;
 				goto restore_opts;
@@ -5052,9 +4692,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
 					ext4_msg(sb, KERN_ERR,
 	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
-		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
+		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
 					       le16_to_cpu(gdp->bg_checksum));
-					err = -EINVAL;
+					err = -EFSBADCRC;
 					goto restore_opts;
 				}
 			}
@@ -5084,8 +4724,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 			sbi->s_mount_state = le16_to_cpu(es->s_state);
 			if (!ext4_setup_super(sb, es, 0))
 				sb->s_flags &= ~MS_RDONLY;
-			if (EXT4_HAS_INCOMPAT_FEATURE(sb,
-						     EXT4_FEATURE_INCOMPAT_MMP))
+			if (ext4_has_feature_mmp(sb))
 				if (ext4_multi_mount_protect(sb,
 						le64_to_cpu(es->s_mmp_block))) {
 					err = -EROFS;
@@ -5118,8 +4757,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 	if (enable_quota) {
 		if (sb_any_quota_suspended(sb))
 			dquot_resume(sb, -1);
-		else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_QUOTA)) {
+		else if (ext4_has_feature_quota(sb)) {
 			err = ext4_enable_quotas(sb);
 			if (err)
 				goto restore_opts;
@@ -5263,7 +4901,7 @@ static int ext4_mark_dquot_dirty(struct dquot *dquot)
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
 	/* Are we journaling quotas? */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
+	if (ext4_has_feature_quota(sb) ||
 	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
 		dquot_mark_dquot_dirty(dquot);
 		return ext4_write_dquot(dquot);
@@ -5351,7 +4989,7 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
 		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
 	};
 
-	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
+	BUG_ON(!ext4_has_feature_quota(sb));
 
 	if (!qf_inums[type])
 		return -EPERM;
@@ -5545,11 +5183,11 @@ static inline void unregister_as_ext2(void)
 
 static inline int ext2_feature_set_ok(struct super_block *sb)
 {
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
+	if (ext4_has_unknown_ext2_incompat_features(sb))
 		return 0;
 	if (sb->s_flags & MS_RDONLY)
 		return 1;
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
+	if (ext4_has_unknown_ext2_ro_compat_features(sb))
 		return 0;
 	return 1;
 }
@@ -5574,13 +5212,13 @@ static inline void unregister_as_ext3(void)
 
 static inline int ext3_feature_set_ok(struct super_block *sb)
 {
-	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
+	if (ext4_has_unknown_ext3_incompat_features(sb))
 		return 0;
-	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
+	if (!ext4_has_feature_journal(sb))
 		return 0;
 	if (sb->s_flags & MS_RDONLY)
 		return 1;
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
+	if (ext4_has_unknown_ext3_ro_compat_features(sb))
 		return 0;
 	return 1;
 }
@@ -5594,37 +5232,6 @@ static struct file_system_type ext4_fs_type = {
 };
 MODULE_ALIAS_FS("ext4");
 
-static int __init ext4_init_feat_adverts(void)
-{
-	struct ext4_features *ef;
-	int ret = -ENOMEM;
-
-	ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
-	if (!ef)
-		goto out;
-
-	ef->f_kobj.kset = ext4_kset;
-	init_completion(&ef->f_kobj_unregister);
-	ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
-				   "features");
-	if (ret) {
-		kfree(ef);
-		goto out;
-	}
-
-	ext4_feat = ef;
-	ret = 0;
-out:
-	return ret;
-}
-
-static void ext4_exit_feat_adverts(void)
-{
-	kobject_put(&ext4_feat->f_kobj);
-	wait_for_completion(&ext4_feat->f_kobj_unregister);
-	kfree(ext4_feat);
-}
-
 /* Shared across all ext4 file systems */
 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
@@ -5651,21 +5258,15 @@ static int __init ext4_init_fs(void)
 
 	err = ext4_init_pageio();
 	if (err)
-		goto out7;
+		goto out5;
 
 	err = ext4_init_system_zone();
 	if (err)
-		goto out6;
-	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
-	if (!ext4_kset) {
-		err = -ENOMEM;
-		goto out5;
-	}
-	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
+		goto out4;
 
-	err = ext4_init_feat_adverts();
+	err = ext4_init_sysfs();
 	if (err)
-		goto out4;
+		goto out3;
 
 	err = ext4_init_mballoc();
 	if (err)
@@ -5690,16 +5291,12 @@ out1:
 	ext4_mballoc_ready = 0;
 	ext4_exit_mballoc();
 out2:
-	ext4_exit_feat_adverts();
-out4:
-	if (ext4_proc_root)
-		remove_proc_entry("fs/ext4", NULL);
-	kset_unregister(ext4_kset);
-out5:
+	ext4_exit_sysfs();
+out3:
 	ext4_exit_system_zone();
-out6:
+out4:
 	ext4_exit_pageio();
-out7:
+out5:
 	ext4_exit_es();
 
 	return err;
@@ -5714,9 +5311,7 @@ static void __exit ext4_exit_fs(void)
 	unregister_filesystem(&ext4_fs_type);
 	destroy_inodecache();
 	ext4_exit_mballoc();
-	ext4_exit_feat_adverts();
-	remove_proc_entry("fs/ext4", NULL);
-	kset_unregister(ext4_kset);
+	ext4_exit_sysfs();
 	ext4_exit_system_zone();
 	ext4_exit_pageio();
 	ext4_exit_es();