ext2: Implement freezing

The only missing piece to make freezing work reliably with ext2 is to
stop iput() of unlinked inode from deleting the inode on frozen filesystem.
So add a necessary protection to ext2_evict_inode().

We also provide appropriate ->freeze_fs and ->unfreeze_fs functions.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 264d315f6c4..6363ac66faf 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -79,6 +79,7 @@ void ext2_evict_inode(struct inode * inode)
         truncate_inode_pages(&inode->i_data, 0);
 
         if (want_delete) {
+                sb_start_intwrite(inode->i_sb);
                 /* set dtime */
                 EXT2_I(inode)->i_dtime  = get_seconds();
                 mark_inode_dirty(inode);
@@ -98,8 +99,10 @@ void ext2_evict_inode(struct inode * inode)
         if (unlikely(rsv))
                 kfree(rsv);
 
-        if (want_delete)
+        if (want_delete) {
                 ext2_free_inode(inode);
+                sb_end_intwrite(inode->i_sb);
+        }
 }
 
 typedef struct {