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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-05-07 12:02:46 -0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-05-14 00:24:23 -0400
commit208b14e507c00ff7f108e1a388dd3d8cc805a443 (patch)
tree34ec5a82825cf87d2d9a2856bde10f722a22cd14 /fs/jffs2/jffs2_fs_sb.h
parente832579fd100eb4f9658bdfefd61caf86a6cbff1 (diff)
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>
Diffstat (limited to 'fs/jffs2/jffs2_fs_sb.h')
-rw-r--r--fs/jffs2/jffs2_fs_sb.h4
1 files changed, 4 insertions, 0 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 {
133 struct jffs2_inodirty *wbuf_inodes; 133 struct jffs2_inodirty *wbuf_inodes;
134 struct rw_semaphore wbuf_sem; /* Protects the write buffer */ 134 struct rw_semaphore wbuf_sem; /* Protects the write buffer */
135 135
136 struct delayed_work wbuf_dwork; /* write-buffer write-out work */
137 int wbuf_queued; /* non-zero delayed work is queued */
138 spinlock_t wbuf_dwork_lock; /* protects wbuf_dwork and and wbuf_queued */
139
136 unsigned char *oobbuf; 140 unsigned char *oobbuf;
137 int oobavail; /* How many bytes are available for JFFS2 in OOB */ 141 int oobavail; /* How many bytes are available for JFFS2 in OOB */
138#endif 142#endif