akpm at linux-foundation.org
2015-Apr-07 21:55 UTC
[Ocfs2-devel] [patch 2/9] ocfs2: flush inode data to disk and free inode when i_count becomes zero
From: Xue jiufei <xuejiufei at huawei.com> Subject: ocfs2: flush inode data to disk and free inode when i_count becomes zero Disk inode deletion may be heavily delayed when one node unlink a file after the same dentry is freed on another node(say N1) because of memory shrink but inode is left in memory. This inode can only be freed while N1 doing the orphan scan work. However, N1 may skip orphan scan for several times because other nodes may do the work earlier. In our tests, it may take 1 hour on 4 nodes cluster and it hurts the user experience. So we think the inode should be freed after the data flushed to disk when i_count becomes zero to avoid such circumstances. Signed-off-by: Joyce.xue <xuejiufei at huawei.com> Cc: Joel Becker <jlbec at evilplan.org> Cc: Mark Fasheh <mfasheh at suse.com> Signed-off-by: Andrew Morton <akpm at linux-foundation.org> --- fs/ocfs2/inode.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff -puN fs/ocfs2/inode.c~ocfs2-flush-inode-data-to-disk-and-free-inode-when-i_count-becomes-zero fs/ocfs2/inode.c --- a/fs/ocfs2/inode.c~ocfs2-flush-inode-data-to-disk-and-free-inode-when-i_count-becomes-zero +++ a/fs/ocfs2/inode.c @@ -1191,17 +1191,19 @@ void ocfs2_evict_inode(struct inode *ino int ocfs2_drop_inode(struct inode *inode) { struct ocfs2_inode_info *oi = OCFS2_I(inode); - int res; trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno, inode->i_nlink, oi->ip_flags); - if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED) - res = 1; - else - res = generic_drop_inode(inode); + assert_spin_locked(&inode->i_lock); + inode->i_state |= I_WILL_FREE; + spin_unlock(&inode->i_lock); + write_inode_now(inode, 1); + spin_lock(&inode->i_lock); + WARN_ON(inode->i_state & I_NEW); + inode->i_state &= ~I_WILL_FREE; - return res; + return 1; } /* _