CRED: Wrap task credential accesses in the Ext2 filesystem

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: linux-ext4@vger.kernel.org
Signed-off-by: James Morris <jmorris@namei.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 6dac7ba2d22d..4a29d6376081 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1193,7 +1193,7 @@ static int ext2_has_free_blocks(struct ext2_sb_info *sbi)
         free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
         root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);
         if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
-                sbi->s_resuid != current->fsuid &&
+                sbi->s_resuid != current_fsuid() &&
                 (sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
                 return 0;
         }
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index f59741346760..8d0add625870 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -550,7 +550,7 @@ got:
 
         sb->s_dirt = 1;
         mark_buffer_dirty(bh2);
-        inode->i_uid = current->fsuid;
+        inode->i_uid = current_fsuid();
         if (test_opt (sb, GRPID))
                 inode->i_gid = dir->i_gid;
         else if (dir->i_mode & S_ISGID) {
@@ -558,7 +558,7 @@ got:
                 if (S_ISDIR(mode))
                         mode |= S_ISGID;
         } else
-                inode->i_gid = current->fsgid;
+                inode->i_gid = current_fsgid();
         inode->i_mode = mode;
 
         inode->i_ino = ino;