jffs2: get rid of jffs2_sync_super

Currently JFFS2 file-system maps the VFS "superblock" abstraction to the
write-buffer. Namely, it uses VFS services to synchronize the write-buffer
periodically.

The whole "superblock write-out" VFS infrastructure is served by the
'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and
writes out all dirty superblock using the '->write_super()' call-back. But the
problem with this thread is that it wastes power by waking up the system every
5 seconds no matter what. So we want to kill it completely and thus, we need to
make file-systems to stop using the '->write_super' VFS service, and then
remove it together with the kernel thread.

This patch switches the JFFS2 write-buffer management from
'->write_super()'/'->s_dirt' to a delayed work. Instead of setting the 's_dirt'
flag we just schedule a delayed work for synchronizing the write-buffer.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

4 files changed, 58 insertions, 21 deletions

diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h
index 0d00bf26923b..413ef89c2d1b 100644
--- a/fs/jffs2/jffs2_fs_sb.h
+++ b/fs/jffs2/jffs2_fs_sb.h
@@ -133,6 +133,10 @@ struct jffs2_sb_info {
         struct jffs2_inodirty *wbuf_inodes;
         struct rw_semaphore wbuf_sem;   /* Protects the write buffer */
 
+        struct delayed_work wbuf_dwork; /* write-buffer write-out work */
+        int wbuf_queued;                /* non-zero delayed work is queued */
+        spinlock_t wbuf_dwork_lock;     /* protects wbuf_dwork and and wbuf_queued */
+
         unsigned char *oobbuf;
         int oobavail; /* How many bytes are available for JFFS2 in OOB */
 #endif
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index 1cd3aec9d9ae..bcd983d7e7f9 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -95,6 +95,7 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
 #define jffs2_ubivol(c) (0)
 #define jffs2_ubivol_setup(c) (0)
 #define jffs2_ubivol_cleanup(c) do {} while (0)
+#define jffs2_dirty_trigger(c) do {} while (0)
 
 #else /* NAND and/or ECC'd NOR support present */
 
@@ -135,14 +136,10 @@ void jffs2_ubivol_cleanup(struct jffs2_sb_info *c);
 #define jffs2_nor_wbuf_flash(c) (c->mtd->type == MTD_NORFLASH && ! (c->mtd->flags & MTD_BIT_WRITEABLE))
 int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c);
 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c);
+void jffs2_dirty_trigger(struct jffs2_sb_info *c);
 
 #endif /* WRITEBUFFER */
 
-static inline void jffs2_dirty_trigger(struct jffs2_sb_info *c)
-{
-        OFNI_BS_2SFFJ(c)->s_dirt = 1;
-}
-
 /* background.c */
 int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c);
 void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c);
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index b36aa950d2a6..61ea41389f90 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -63,18 +63,6 @@ static void jffs2_i_init_once(void *foo)
         inode_init_once(&f->vfs_inode);
 }
 
-static void jffs2_write_super(struct super_block *sb)
-{
-        struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
-
-        sb->s_dirt = 0;
-
-        if (!(sb->s_flags & MS_RDONLY)) {
-                jffs2_dbg(1, "%s()\n", __func__);
-                jffs2_flush_wbuf_gc(c, 0);
-        }
-}
-
 static const char *jffs2_compr_name(unsigned int compr)
 {
         switch (compr) {
@@ -263,7 +251,6 @@ static const struct super_operations jffs2_super_operations =
         .alloc_inode =  jffs2_alloc_inode,
         .destroy_inode =jffs2_destroy_inode,
         .put_super =    jffs2_put_super,
-        .write_super =  jffs2_write_super,
         .statfs =       jffs2_statfs,
         .remount_fs =   jffs2_remount_fs,
         .evict_inode =  jffs2_evict_inode,
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 74d9be19df3f..6f4529d3697f 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -20,6 +20,7 @@
 #include <linux/mtd/nand.h>
 #include <linux/jiffies.h>
 #include <linux/sched.h>
+#include <linux/writeback.h>
 
 #include "nodelist.h"
 
@@ -85,7 +86,7 @@ static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
 {
         struct jffs2_inodirty *new;
 
-        /* Mark the superblock dirty so that kupdated will flush... */
+        /* Schedule delayed write-buffer write-out */
         jffs2_dirty_trigger(c);
 
         if (jffs2_wbuf_pending_for_ino(c, ino))
@@ -1148,6 +1149,47 @@ int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *
         return 1;
 }
 
+static struct jffs2_sb_info *work_to_sb(struct work_struct *work)
+{
+        struct delayed_work *dwork;
+
+        dwork = container_of(work, struct delayed_work, work);
+        return container_of(dwork, struct jffs2_sb_info, wbuf_dwork);
+}
+
+static void delayed_wbuf_sync(struct work_struct *work)
+{
+        struct jffs2_sb_info *c = work_to_sb(work);
+        struct super_block *sb = OFNI_BS_2SFFJ(c);
+
+        spin_lock(&c->wbuf_dwork_lock);
+        c->wbuf_queued = 0;
+        spin_unlock(&c->wbuf_dwork_lock);
+
+        if (!(sb->s_flags & MS_RDONLY)) {
+                jffs2_dbg(1, "%s()\n", __func__);
+                jffs2_flush_wbuf_gc(c, 0);
+        }
+}
+
+void jffs2_dirty_trigger(struct jffs2_sb_info *c)
+{
+        struct super_block *sb = OFNI_BS_2SFFJ(c);
+        unsigned long delay;
+
+        if (sb->s_flags & MS_RDONLY)
+                return;
+
+        spin_lock(&c->wbuf_dwork_lock);
+        if (!c->wbuf_queued) {
+                jffs2_dbg(1, "%s()\n", __func__);
+                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+                queue_delayed_work(system_long_wq, &c->wbuf_dwork, delay);
+                c->wbuf_queued = 1;
+        }
+        spin_unlock(&c->wbuf_dwork_lock);
+}
+
 int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
 {
         struct nand_ecclayout *oinfo = c->mtd->ecclayout;
@@ -1169,6 +1211,8 @@ int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
 
         /* Initialise write buffer */
         init_rwsem(&c->wbuf_sem);
+        spin_lock_init(&c->wbuf_dwork_lock);
+        INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
         c->wbuf_pagesize = c->mtd->writesize;
         c->wbuf_ofs = 0xFFFFFFFF;
 
@@ -1207,8 +1251,8 @@ int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
 
         /* Initialize write buffer */
         init_rwsem(&c->wbuf_sem);
-
-
+        spin_lock_init(&c->wbuf_dwork_lock);
+        INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
         c->wbuf_pagesize =  c->mtd->erasesize;
 
         /* Find a suitable c->sector_size
@@ -1267,6 +1311,9 @@ int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
 
         /* Initialize write buffer */
         init_rwsem(&c->wbuf_sem);
+        spin_lock_init(&c->wbuf_dwork_lock);
+        INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
+
         c->wbuf_pagesize = c->mtd->writesize;
         c->wbuf_ofs = 0xFFFFFFFF;
 
@@ -1299,6 +1346,8 @@ int jffs2_ubivol_setup(struct jffs2_sb_info *c) {
                 return 0;
 
         init_rwsem(&c->wbuf_sem);
+        spin_lock_init(&c->wbuf_dwork_lock);
+        INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
 
         c->wbuf_pagesize =  c->mtd->writesize;
         c->wbuf_ofs = 0xFFFFFFFF;