[PATCH] r/o bind mounts: unlink: monitor i_nlink

When a filesystem decrements i_nlink to zero, it means that a write must be
performed in order to drop the inode from the filesystem.

We're shortly going to have keep filesystems from being remounted r/o between
the time that this i_nlink decrement and that write occurs.

So, add a little helper function to do the decrements.  We'll tie into it in a
bit to note when i_nlink hits zero.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 849c3b4bb94a..40f83f53053a 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -739,7 +739,7 @@ static int ocfs2_link(struct dentry *old_dentry,
         err = ocfs2_journal_dirty(handle, fe_bh);
         if (err < 0) {
                 le16_add_cpu(&fe->i_links_count, -1);
-                inode->i_nlink--;
+                drop_nlink(inode);
                 mlog_errno(err);
                 goto bail;
         }
@@ -749,7 +749,7 @@ static int ocfs2_link(struct dentry *old_dentry,
                               parent_fe_bh, de_bh);
         if (err) {
                 le16_add_cpu(&fe->i_links_count, -1);
-                inode->i_nlink--;
+                drop_nlink(inode);
                 mlog_errno(err);
                 goto bail;
         }