CRED: Wrap task credential accesses in the Ext4 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: Stephen Tweedie <sct@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: adilger@sun.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/ext4/balloc.c b/fs/ext4/balloc.c
index d2003cdc36aa..a932b9a29240 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -624,7 +624,7 @@ int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
                 return 1;
 
         /* Hm, nope.  Are (enough) root reserved blocks available? */
-        if (sbi->s_resuid == current->fsuid ||
+        if (sbi->s_resuid == current_fsuid() ||
             ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
             capable(CAP_SYS_RESOURCE)) {
                 if (free_blocks >= (nblocks + dirty_blocks))
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index fe34d74cfb19..c8ea50ed023a 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -785,7 +785,7 @@ got:
                 spin_unlock(sb_bgl_lock(sbi, flex_group));
         }
 
-        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) {
@@ -793,7 +793,7 @@ 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 + group * EXT4_INODES_PER_GROUP(sb);