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Subject[PATCH 25/59] CRED: Wrap task credential accesses in the Ext4 filesystem
Date
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
---
fs/ext4/balloc.c | 3 +--
fs/ext4/ialloc.c | 4 ++--
2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index e9fa960..448cd59 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -1618,7 +1618,7 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);

if (!capable(CAP_SYS_RESOURCE) &&
- sbi->s_resuid != current->fsuid &&
+ sbi->s_resuid != current_fsuid() &&
(sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
root_blocks = ext4_r_blocks_count(sbi->s_es);
#ifdef CONFIG_SMP
@@ -1634,7 +1634,6 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
return nblocks;
}

-
/**
* ext4_should_retry_alloc()
* @sb: super block
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index f344834..97ed523 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -782,7 +782,7 @@ 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) {
@@ -790,7 +790,7 @@ 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);


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