[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, 4 deletions

diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
index c3d83f67154a..ad5afa4ea8f3 100644
--- a/fs/qnx4/namei.c
+++ b/fs/qnx4/namei.c
@@ -189,8 +189,7 @@ int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
         inode->i_nlink = 0;
         mark_inode_dirty(inode);
         inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
-        dir->i_nlink--;
-        mark_inode_dirty(dir);
+        inode_dec_link_count(dir);
         retval = 0;
 
       end_rmdir:
@@ -234,9 +233,8 @@ int qnx4_unlink(struct inode *dir, struct dentry *dentry)
         mark_buffer_dirty(bh);
         dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
         mark_inode_dirty(dir);
-        inode->i_nlink--;
         inode->i_ctime = dir->i_ctime;
-        mark_inode_dirty(inode);
+        inode_dec_link_count(inode);
         retval = 0;
 
 end_unlink: