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

Pull ext4 updates from Ted Ts'o:
 "Various cleanups and bug fixes in ext4's extent status tree,
  journalling, and block allocator subsystems.

  Also improve performance for parallel DIO overwrites"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (55 commits)
  ext4: avoid updating the superblock on a r/o mount if not needed
  jbd2: skip reading super block if it has been verified
  ext4: fix to check return value of freeze_bdev() in ext4_shutdown()
  ext4: refactoring to use the unified helper ext4_quotas_off()
  ext4: turn quotas off if mount failed after enabling quotas
  ext4: update doc about journal superblock description
  ext4: add journal cycled recording support
  jbd2: continue to record log between each mount
  jbd2: remove j_format_version
  jbd2: factor out journal initialization from journal_get_superblock()
  jbd2: switch to check format version in superblock directly
  jbd2: remove unused feature macros
  ext4: ext4_put_super: Remove redundant checking for 'sbi->s_journal_bdev'
  ext4: Fix reusing stale buffer heads from last failed mounting
  ext4: allow concurrent unaligned dio overwrites
  ext4: clean up mballoc criteria comments
  ext4: make ext4_zeroout_es() return void
  ext4: make ext4_es_insert_extent() return void
  ext4: make ext4_es_insert_delayed_block() return void
  ext4: make ext4_es_remove_extent() return void
  ...

2 files changed, 56 insertions, 44 deletions

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 6e17f8f94dfd..fbce16fedaa4 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1557,8 +1557,21 @@ static int journal_reset(journal_t *journal)
 	journal->j_first = first;
 	journal->j_last = last;
 
-	journal->j_head = journal->j_first;
-	journal->j_tail = journal->j_first;
+	if (journal->j_head != 0 && journal->j_flags & JBD2_CYCLE_RECORD) {
+		/*
+		 * Disable the cycled recording mode if the journal head block
+		 * number is not correct.
+		 */
+		if (journal->j_head < first || journal->j_head >= last) {
+			printk(KERN_WARNING "JBD2: Incorrect Journal head block %lu, "
+			       "disable journal_cycle_record\n",
+			       journal->j_head);
+			journal->j_head = journal->j_first;
+		}
+	} else {
+		journal->j_head = journal->j_first;
+	}
+	journal->j_tail = journal->j_head;
 	journal->j_free = journal->j_last - journal->j_first;
 
 	journal->j_tail_sequence = journal->j_transaction_sequence;
@@ -1730,6 +1743,7 @@ static void jbd2_mark_journal_empty(journal_t *journal, blk_opf_t write_flags)
 
 	sb->s_sequence = cpu_to_be32(journal->j_tail_sequence);
 	sb->s_start    = cpu_to_be32(0);
+	sb->s_head     = cpu_to_be32(journal->j_head);
 	if (jbd2_has_feature_fast_commit(journal)) {
 		/*
 		 * When journal is clean, no need to commit fast commit flag and
@@ -1903,6 +1917,9 @@ static int journal_get_superblock(journal_t *journal)
 	bh = journal->j_sb_buffer;
 
 	J_ASSERT(bh != NULL);
+	if (buffer_verified(bh))
+		return 0;
+
 	err = bh_read(bh, 0);
 	if (err < 0) {
 		printk(KERN_ERR
@@ -1910,9 +1927,6 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
-	if (buffer_verified(bh))
-		return 0;
-
 	sb = journal->j_superblock;
 
 	err = -EINVAL;
@@ -1923,21 +1937,13 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
-	switch(be32_to_cpu(sb->s_header.h_blocktype)) {
-	case JBD2_SUPERBLOCK_V1:
-		journal->j_format_version = 1;
-		break;
-	case JBD2_SUPERBLOCK_V2:
-		journal->j_format_version = 2;
-		break;
-	default:
+	if (be32_to_cpu(sb->s_header.h_blocktype) != JBD2_SUPERBLOCK_V1 &&
+	    be32_to_cpu(sb->s_header.h_blocktype) != JBD2_SUPERBLOCK_V2) {
 		printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n");
 		goto out;
 	}
 
-	if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
-		journal->j_total_len = be32_to_cpu(sb->s_maxlen);
-	else if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
+	if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
 		printk(KERN_WARNING "JBD2: journal file too short\n");
 		goto out;
 	}
@@ -1980,25 +1986,14 @@ static int journal_get_superblock(journal_t *journal)
 			journal->j_chksum_driver = NULL;
 			goto out;
 		}
-	}
-
-	if (jbd2_journal_has_csum_v2or3(journal)) {
 		/* Check superblock checksum */
 		if (sb->s_checksum != jbd2_superblock_csum(journal, sb)) {
 			printk(KERN_ERR "JBD2: journal checksum error\n");
 			err = -EFSBADCRC;
 			goto out;
 		}
-
-		/* Precompute checksum seed for all metadata */
-		journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
-						   sizeof(sb->s_uuid));
 	}
-
-	journal->j_revoke_records_per_block =
-				journal_revoke_records_per_block(journal);
 	set_buffer_verified(bh);
-
 	return 0;
 
 out:
@@ -2029,6 +2024,15 @@ static int load_superblock(journal_t *journal)
 	journal->j_errno = be32_to_cpu(sb->s_errno);
 	journal->j_last = be32_to_cpu(sb->s_maxlen);
 
+	if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
+		journal->j_total_len = be32_to_cpu(sb->s_maxlen);
+	/* Precompute checksum seed for all metadata */
+	if (jbd2_journal_has_csum_v2or3(journal))
+		journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
+						   sizeof(sb->s_uuid));
+	journal->j_revoke_records_per_block =
+				journal_revoke_records_per_block(journal);
+
 	if (jbd2_has_feature_fast_commit(journal)) {
 		journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
 		num_fc_blocks = jbd2_journal_get_num_fc_blks(sb);
@@ -2060,10 +2064,12 @@ int jbd2_journal_load(journal_t *journal)
 		return err;
 
 	sb = journal->j_superblock;
-	/* If this is a V2 superblock, then we have to check the
-	 * features flags on it. */
 
-	if (journal->j_format_version >= 2) {
+	/*
+	 * If this is a V2 superblock, then we have to check the
+	 * features flags on it.
+	 */
+	if (jbd2_format_support_feature(journal)) {
 		if ((sb->s_feature_ro_compat &
 		     ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) ||
 		    (sb->s_feature_incompat &
@@ -2221,11 +2227,9 @@ int jbd2_journal_check_used_features(journal_t *journal, unsigned long compat,
 
 	if (!compat && !ro && !incompat)
 		return 1;
-	/* Load journal superblock if it is not loaded yet. */
-	if (journal->j_format_version == 0 &&
-	    journal_get_superblock(journal) != 0)
+	if (journal_get_superblock(journal))
 		return 0;
-	if (journal->j_format_version == 1)
+	if (!jbd2_format_support_feature(journal))
 		return 0;
 
 	sb = journal->j_superblock;
@@ -2255,11 +2259,7 @@ int jbd2_journal_check_available_features(journal_t *journal, unsigned long comp
 	if (!compat && !ro && !incompat)
 		return 1;
 
-	/* We can support any known requested features iff the
-	 * superblock is in version 2.  Otherwise we fail to support any
-	 * extended sb features. */
-
-	if (journal->j_format_version != 2)
+	if (!jbd2_format_support_feature(journal))
 		return 0;
 
 	if ((compat   & JBD2_KNOWN_COMPAT_FEATURES) == compat &&
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 8286a9ec122f..0184931d47f7 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -29,6 +29,7 @@ struct recovery_info
 {
 	tid_t		start_transaction;
 	tid_t		end_transaction;
+	unsigned long	head_block;
 
 	int		nr_replays;
 	int		nr_revokes;
@@ -301,11 +302,11 @@ int jbd2_journal_recover(journal_t *journal)
 	 * is always zero if, and only if, the journal was cleanly
 	 * unmounted.
 	 */
-
 	if (!sb->s_start) {
-		jbd2_debug(1, "No recovery required, last transaction %d\n",
-			  be32_to_cpu(sb->s_sequence));
+		jbd2_debug(1, "No recovery required, last transaction %d, head block %u\n",
+			  be32_to_cpu(sb->s_sequence), be32_to_cpu(sb->s_head));
 		journal->j_transaction_sequence = be32_to_cpu(sb->s_sequence) + 1;
+		journal->j_head = be32_to_cpu(sb->s_head);
 		return 0;
 	}
 
@@ -324,6 +325,9 @@ int jbd2_journal_recover(journal_t *journal)
 	/* Restart the log at the next transaction ID, thus invalidating
 	 * any existing commit records in the log. */
 	journal->j_transaction_sequence = ++info.end_transaction;
+	journal->j_head = info.head_block;
+	jbd2_debug(1, "JBD2: last transaction %d, head block %lu\n",
+		  journal->j_transaction_sequence, journal->j_head);
 
 	jbd2_journal_clear_revoke(journal);
 	err2 = sync_blockdev(journal->j_fs_dev);
@@ -364,6 +368,7 @@ int jbd2_journal_skip_recovery(journal_t *journal)
 	if (err) {
 		printk(KERN_ERR "JBD2: error %d scanning journal\n", err);
 		++journal->j_transaction_sequence;
+		journal->j_head = journal->j_first;
 	} else {
 #ifdef CONFIG_JBD2_DEBUG
 		int dropped = info.end_transaction - 
@@ -373,6 +378,7 @@ int jbd2_journal_skip_recovery(journal_t *journal)
 			  dropped, (dropped == 1) ? "" : "s");
 #endif
 		journal->j_transaction_sequence = ++info.end_transaction;
+		journal->j_head = info.head_block;
 	}
 
 	journal->j_tail = 0;
@@ -462,7 +468,7 @@ static int do_one_pass(journal_t *journal,
 			struct recovery_info *info, enum passtype pass)
 {
 	unsigned int		first_commit_ID, next_commit_ID;
-	unsigned long		next_log_block;
+	unsigned long		next_log_block, head_block;
 	int			err, success = 0;
 	journal_superblock_t *	sb;
 	journal_header_t *	tmp;
@@ -485,6 +491,7 @@ static int do_one_pass(journal_t *journal,
 	sb = journal->j_superblock;
 	next_commit_ID = be32_to_cpu(sb->s_sequence);
 	next_log_block = be32_to_cpu(sb->s_start);
+	head_block = next_log_block;
 
 	first_commit_ID = next_commit_ID;
 	if (pass == PASS_SCAN)
@@ -809,6 +816,7 @@ static int do_one_pass(journal_t *journal,
 				if (commit_time < last_trans_commit_time)
 					goto ignore_crc_mismatch;
 				info->end_transaction = next_commit_ID;
+				info->head_block = head_block;
 
 				if (!jbd2_has_feature_async_commit(journal)) {
 					journal->j_failed_commit =
@@ -817,8 +825,10 @@ static int do_one_pass(journal_t *journal,
 					break;
 				}
 			}
-			if (pass == PASS_SCAN)
+			if (pass == PASS_SCAN) {
 				last_trans_commit_time = commit_time;
+				head_block = next_log_block;
+			}
 			brelse(bh);
 			next_commit_ID++;
 			continue;
@@ -868,6 +878,8 @@ static int do_one_pass(journal_t *journal,
 	if (pass == PASS_SCAN) {
 		if (!info->end_transaction)
 			info->end_transaction = next_commit_ID;
+		if (!info->head_block)
+			info->head_block = head_block;
 	} else {
 		/* It's really bad news if different passes end up at
 		 * different places (but possible due to IO errors). */