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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-07-12 17:26:31 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:58:04 +0400
commit9e6c5829b07c9ba6668807631914efc557fab059 (patch)
tree4355c4b76869cf7fba0b2a60066e649e12e7fcc8 /fs/hfsplus/hfsplus_fs.h
parent58770d7e83eede5fafbcdf54a604277d70010705 (diff)
downloadop-kernel-dev-9e6c5829b07c9ba6668807631914efc557fab059.zip
op-kernel-dev-9e6c5829b07c9ba6668807631914efc557fab059.tar.gz
hfsplus: get rid of write_super
This patch makes hfsplus stop using the VFS '->write_super()' method along with the 's_dirt' superblock flag, because they are on their way out. 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 superblocks 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, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). 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. Tested using fsstress from the LTP project. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/hfsplus/hfsplus_fs.h')
-rw-r--r--fs/hfsplus/hfsplus_fs.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 66a9365..558dbb4 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -153,8 +153,11 @@ struct hfsplus_sb_info {
gid_t gid;
int part, session;
-
unsigned long flags;
+
+ int work_queued; /* non-zero delayed work is queued */
+ struct delayed_work sync_work; /* FS sync delayed work */
+ spinlock_t work_lock; /* protects sync_work and work_queued */
};
#define HFSPLUS_SB_WRITEBACKUP 0
@@ -428,6 +431,7 @@ int hfsplus_show_options(struct seq_file *, struct dentry *);
/* super.c */
struct inode *hfsplus_iget(struct super_block *, unsigned long);
+void hfsplus_mark_mdb_dirty(struct super_block *sb);
/* tables.c */
extern u16 hfsplus_case_fold_table[];
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