task_struct: make journal_info conditional

journal_info in task_struct is used in journaling file system only.  So
introduce CONFIG_FS_JOURNAL_INFO and make it conditional.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

10 files changed, 20 insertions, 1 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index 64d44efad7a5..f8fccaaad628 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -6,6 +6,10 @@ menu "File systems"
 
 if BLOCK
 
+config FS_JOURNAL_INFO
+        bool
+        default n
+
 source "fs/ext2/Kconfig"
 source "fs/ext3/Kconfig"
 source "fs/ext4/Kconfig"
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 7bb3c020e570..402afe0a0bfb 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -4,6 +4,7 @@ config BTRFS_FS
         select LIBCRC32C
         select ZLIB_INFLATE
         select ZLIB_DEFLATE
+        select FS_JOURNAL_INFO
         help
           Btrfs is a new filesystem with extents, writable snapshotting,
           support for multiple devices and many more features.
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 9acf7e808139..e5f6774846e4 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -2,6 +2,7 @@ config EXT4_FS
         tristate "The Extended 4 (ext4) filesystem"
         select JBD2
         select CRC16
+        select FS_JOURNAL_INFO
         help
           This is the next generation of the ext3 filesystem.
 
diff --git a/fs/gfs2/Kconfig b/fs/gfs2/Kconfig
index 4dcddf83326f..b192c661caa6 100644
--- a/fs/gfs2/Kconfig
+++ b/fs/gfs2/Kconfig
@@ -10,6 +10,7 @@ config GFS2_FS
         select SLOW_WORK
         select QUOTA
         select QUOTACTL
+        select FS_JOURNAL_INFO
         help
           A cluster filesystem.
 
diff --git a/fs/jbd/Kconfig b/fs/jbd/Kconfig
index 4e28beeed157..a8408983abd4 100644
--- a/fs/jbd/Kconfig
+++ b/fs/jbd/Kconfig
@@ -1,5 +1,6 @@
 config JBD
         tristate
+        select FS_JOURNAL_INFO
         help
           This is a generic journalling layer for block devices.  It is
           currently used by the ext3 file system, but it could also be
diff --git a/fs/jbd2/Kconfig b/fs/jbd2/Kconfig
index f32f346f4b0a..0f7d1ceafdfd 100644
--- a/fs/jbd2/Kconfig
+++ b/fs/jbd2/Kconfig
@@ -1,6 +1,7 @@
 config JBD2
         tristate
         select CRC32
+        select FS_JOURNAL_INFO
         help
           This is a generic journaling layer for block devices that support
           both 32-bit and 64-bit block numbers.  It is currently used by
diff --git a/fs/nilfs2/Kconfig b/fs/nilfs2/Kconfig
index 251da07b2a1d..1225af7b2166 100644
--- a/fs/nilfs2/Kconfig
+++ b/fs/nilfs2/Kconfig
@@ -2,6 +2,7 @@ config NILFS2_FS
         tristate "NILFS2 file system support (EXPERIMENTAL)"
         depends on EXPERIMENTAL
         select CRC32
+        select FS_JOURNAL_INFO
         help
           NILFS2 is a log-structured file system (LFS) supporting continuous
           snapshotting.  In addition to versioning capability of the entire
diff --git a/fs/reiserfs/Kconfig b/fs/reiserfs/Kconfig
index 513f431038f9..ac7cd75c86f8 100644
--- a/fs/reiserfs/Kconfig
+++ b/fs/reiserfs/Kconfig
@@ -1,6 +1,7 @@
 config REISERFS_FS
         tristate "Reiserfs support"
         select CRC32
+        select FS_JOURNAL_INFO
         help
           Stores not just filenames but the files themselves in a balanced
           tree.  Uses journalling.
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 8d10aa7fd4c9..8ed0abf06f89 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -111,6 +111,12 @@ extern struct cred init_cred;
 # define INIT_PERF_EVENTS(tsk)
 #endif
 
+#ifdef CONFIG_FS_JOURNAL_INFO
+#define INIT_JOURNAL_INFO       .journal_info = NULL,
+#else
+#define INIT_JOURNAL_INFO
+#endif
+
 /*
  *  INIT_TASK is used to set up the first task table, touch at
  * your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -162,7 +168,6 @@ extern struct cred init_cred;
                 .signal = {{0}}},                                       \
         .blocked        = {{0}},                                        \
         .alloc_lock     = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock),         \
-        .journal_info   = NULL,                                         \
         .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
         .fs_excl        = ATOMIC_INIT(0),                               \
         .pi_lock        = __SPIN_LOCK_UNLOCKED(tsk.pi_lock),            \
@@ -173,6 +178,7 @@ extern struct cred init_cred;
                 [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),            \
         },                                                              \
         .dirties = INIT_PROP_LOCAL_SINGLE(dirties),                     \
+        INIT_JOURNAL_INFO                                               \
         INIT_IDS                                                        \
         INIT_PERF_EVENTS(tsk)                                           \
         INIT_TRACE_IRQFLAGS                                             \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 294eb2f80144..7d388494f45d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1446,8 +1446,10 @@ struct task_struct {
         gfp_t lockdep_reclaim_gfp;
 #endif
 
+#ifdef CONFIG_FS_JOURNAL_INFO
 /* journalling filesystem info */
         void *journal_info;
+#endif
 
 /* stacked block device info */
         struct bio *bio_list, **bio_tail;