From 9e9ad5f408889db6038a59b38ede29ff1ba9ef2f Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Thu, 12 Jul 2012 16:28:08 +0300 Subject: fs/ufs: get rid of write_super This patch makes UFS stop using the VFS '->write_super()' method along with the 's_dirt' superblock flag, because they are on their way out. The way we implement this is that we schedule a delay job instead relying on 's_dirt' and '->write_super()'. 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 Signed-off-by: Al Viro --- fs/ufs/balloc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/ufs/balloc.c') diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c index 42694e11c23d..1b3e410bf334 100644 --- a/fs/ufs/balloc.c +++ b/fs/ufs/balloc.c @@ -116,7 +116,7 @@ void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count) ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); if (sb->s_flags & MS_SYNCHRONOUS) ubh_sync_block(UCPI_UBH(ucpi)); - sb->s_dirt = 1; + ufs_mark_sb_dirty(sb); unlock_super (sb); UFSD("EXIT\n"); @@ -214,7 +214,7 @@ do_more: goto do_more; } - sb->s_dirt = 1; + ufs_mark_sb_dirty(sb); unlock_super (sb); UFSD("EXIT\n"); return; @@ -557,7 +557,7 @@ static u64 ufs_add_fragments(struct inode *inode, u64 fragment, ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); if (sb->s_flags & MS_SYNCHRONOUS) ubh_sync_block(UCPI_UBH(ucpi)); - sb->s_dirt = 1; + ufs_mark_sb_dirty(sb); UFSD("EXIT, fragment %llu\n", (unsigned long long)fragment); @@ -677,7 +677,7 @@ succed: ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); if (sb->s_flags & MS_SYNCHRONOUS) ubh_sync_block(UCPI_UBH(ucpi)); - sb->s_dirt = 1; + ufs_mark_sb_dirty(sb); result += cgno * uspi->s_fpg; UFSD("EXIT3, result %llu\n", (unsigned long long)result); -- cgit v1.2.3