[PATCH] fs: ext4fs: add CONFIG_EXT4_MAX_JOURNAL_ENTRIES to Kconfig

[Tony Dinh]

Add maximum ext4 journal entries to Kconfig. It is necessary since the
number of journal entries is proportional to disk capacity. For example,
an ext4 4TB HDD partition could require approximately 500 entries.

Signed-off-by: Tony Dinh <mibodhi at gmail.com>
---
 fs/ext4/Kconfig        | 8 ++++++++
 fs/ext4/ext4_journal.h | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 8ddaebebd48..a2faa9f878a 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -12,3 +12,11 @@ config EXT4_WRITE
 	help
 	  This provides support for creating and writing new files to an
 	  existing ext4 filesystem partition.
+
+config EXT4_MAX_JOURNAL_ENTRIES
+	int "Maximum numbers of journal entries for ext4 filesystem"
+	default 100
+	depends on EXT4_WRITE
+	help
+	  This provides support for allocating the maximum number of
+	  journal entries in disks formatted with ext4 filesysyem.
diff --git a/fs/ext4/ext4_journal.h b/fs/ext4/ext4_journal.h
index 43fb8e76641..a492df49fbe 100644
--- a/fs/ext4/ext4_journal.h
+++ b/fs/ext4/ext4_journal.h
@@ -38,7 +38,7 @@
 #define EXT3_JOURNAL_FLAG_LAST_TAG	8
 
 /* Maximum entries in 1 journal transaction */
-#define MAX_JOURNAL_ENTRIES 100
+#define MAX_JOURNAL_ENTRIES CONFIG_EXT4_MAX_JOURNAL_ENTRIES
 struct journal_log {
 	char *buf;
 	int blknr;
-- 
2.39.5