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hfsplus: get rid of write_super

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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>
This commit is contained in:
Artem Bityutskiy
2012-07-12 17:26:31 +03:00
committed by Al Viro
parent 58770d7e83
commit 9e6c5829b0
5 changed files with 43 additions and 16 deletions
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6
fs/hfsplus/inode.c
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@@ -431,7 +431,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode)
sbi->file_count++;
insert_inode_hash(inode);
mark_inode_dirty(inode);
sb->s_dirt = 1;
hfsplus_mark_mdb_dirty(sb);
return inode;
}
@@ -442,7 +442,7 @@ void hfsplus_delete_inode(struct inode *inode)
if (S_ISDIR(inode->i_mode)) {
HFSPLUS_SB(sb)->folder_count--;
sb->s_dirt = 1;
hfsplus_mark_mdb_dirty(sb);
return;
}
HFSPLUS_SB(sb)->file_count--;
@@ -455,7 +455,7 @@ void hfsplus_delete_inode(struct inode *inode)
inode->i_size = 0;
hfsplus_file_truncate(inode);
}
sb->s_dirt = 1;
hfsplus_mark_mdb_dirty(sb);
}
void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)