CRED: Wrap task credential accesses in the CIFS 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: Steve French <sfrench@samba.org>
Cc: linux-cifs-client@lists.samba.org
Signed-off-by: James Morris <jmorris@namei.org>

7 files changed, 17 insertions, 17 deletions

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 877c85409f1f..1e7b87497f26 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -19,7 +19,7 @@
 #define _CIFS_FS_SB_H
 
 #define CIFS_MOUNT_NO_PERM      1 /* do not do client vfs_perm check */
-#define CIFS_MOUNT_SET_UID      2 /* set current->euid in create etc. */
+#define CIFS_MOUNT_SET_UID      2 /* set current's euid in create etc. */
 #define CIFS_MOUNT_SERVER_INUM  4 /* inode numbers from uniqueid from server */
 #define CIFS_MOUNT_DIRECT_IO    8 /* do not write nor read through page cache */
 #define CIFS_MOUNT_NO_XATTR     0x10  /* if set - disable xattr support       */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 6f21ecb85ce5..9d8b978137ad 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -39,7 +39,7 @@ extern int smb_send(struct socket *, struct smb_hdr *,
                         unsigned int /* length */ , struct sockaddr *, bool);
 extern unsigned int _GetXid(void);
 extern void _FreeXid(unsigned int);
-#define GetXid() (int)_GetXid(); cFYI(1,("CIFS VFS: in %s as Xid: %d with uid: %d",__func__, xid,current->fsuid));
+#define GetXid() (int)_GetXid(); cFYI(1,("CIFS VFS: in %s as Xid: %d with uid: %d",__func__, xid,current_fsuid()));
 #define FreeXid(curr_xid) {_FreeXid(curr_xid); cFYI(1,("CIFS VFS: leaving %s (xid = %d) rc = %d",__func__,curr_xid,(int)rc));}
 extern char *build_path_from_dentry(struct dentry *);
 extern char *build_wildcard_path_from_dentry(struct dentry *direntry);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index e9f9248cb3fe..e5dca9a48d9f 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -833,8 +833,8 @@ cifs_parse_mount_options(char *options, const char *devname,
         /* null target name indicates to use *SMBSERVR default called name
            if we end up sending RFC1001 session initialize */
         vol->target_rfc1001_name[0] = 0;
-        vol->linux_uid = current->uid;  /* current->euid instead? */
-        vol->linux_gid = current->gid;
+        vol->linux_uid = current_uid();  /* use current_euid() instead? */
+        vol->linux_gid = current_gid();
         vol->dir_mode = S_IRWXUGO;
         /* 2767 perms indicate mandatory locking support */
         vol->file_mode = (S_IRWXUGO | S_ISGID) & (~S_IXGRP);
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index e962e75e6f7b..2f02c52db666 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -235,11 +235,11 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                         };
 
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
-                                args.uid = (__u64) current->fsuid;
+                                args.uid = (__u64) current_fsuid();
                                 if (inode->i_mode & S_ISGID)
                                         args.gid = (__u64) inode->i_gid;
                                 else
-                                        args.gid = (__u64) current->fsgid;
+                                        args.gid = (__u64) current_fsgid();
                         } else {
                                 args.uid = NO_CHANGE_64;
                                 args.gid = NO_CHANGE_64;
@@ -271,13 +271,13 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                                 if ((oplock & CIFS_CREATE_ACTION) &&
                                     (cifs_sb->mnt_cifs_flags &
                                      CIFS_MOUNT_SET_UID)) {
-                                        newinode->i_uid = current->fsuid;
+                                        newinode->i_uid = current_fsuid();
                                         if (inode->i_mode & S_ISGID)
                                                 newinode->i_gid =
                                                         inode->i_gid;
                                         else
                                                 newinode->i_gid =
-                                                        current->fsgid;
+                                                        current_fsgid();
                                 }
                         }
                 }
@@ -375,8 +375,8 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
                         .device = device_number,
                 };
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
-                        args.uid = (__u64) current->fsuid;
-                        args.gid = (__u64) current->fsgid;
+                        args.uid = (__u64) current_fsuid();
+                        args.gid = (__u64) current_fsgid();
                 } else {
                         args.uid = NO_CHANGE_64;
                         args.gid = NO_CHANGE_64;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ff8c68de4a92..8b7305e73d7e 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1143,11 +1143,11 @@ mkdir_get_info:
                                 .device = 0,
                         };
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
-                                args.uid = (__u64)current->fsuid;
+                                args.uid = (__u64)current_fsuid();
                                 if (inode->i_mode & S_ISGID)
                                         args.gid = (__u64)inode->i_gid;
                                 else
-                                        args.gid = (__u64)current->fsgid;
+                                        args.gid = (__u64)current_fsgid();
                         } else {
                                 args.uid = NO_CHANGE_64;
                                 args.gid = NO_CHANGE_64;
@@ -1184,13 +1184,13 @@ mkdir_get_info:
                                 if (cifs_sb->mnt_cifs_flags &
                                      CIFS_MOUNT_SET_UID) {
                                         direntry->d_inode->i_uid =
-                                                current->fsuid;
+                                                current_fsuid();
                                         if (inode->i_mode & S_ISGID)
                                                 direntry->d_inode->i_gid =
                                                         inode->i_gid;
                                         else
                                                 direntry->d_inode->i_gid =
-                                                        current->fsgid;
+                                                        current_fsgid();
                                 }
                         }
                 }
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 0088a5b52564..f94650683a00 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -65,7 +65,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
         switch (command) {
                 case CIFS_IOC_CHECKUMOUNT:
                         cFYI(1, ("User unmount attempted"));
-                        if (cifs_sb->mnt_uid == current->uid)
+                        if (cifs_sb->mnt_uid == current_uid())
                                 rc = 0;
                         else {
                                 rc = -EACCES;
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 88786ba02d27..ec36410a9125 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -347,13 +347,13 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
                 /*  BB Add support for establishing new tCon and SMB Session  */
                 /*      with userid/password pairs found on the smb session   */
                 /*      for other target tcp/ip addresses               BB    */
-                                if (current->fsuid != treeCon->ses->linux_uid) {
+                                if (current_fsuid() != treeCon->ses->linux_uid) {
                                         cFYI(1, ("Multiuser mode and UID "
                                                  "did not match tcon uid"));
                                         read_lock(&GlobalSMBSeslock);
                                         list_for_each(temp_item, &GlobalSMBSessionList) {
                                                 ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
-                                                if (ses->linux_uid == current->fsuid) {
+                                                if (ses->linux_uid == current_fsuid()) {
                                                         if (ses->server == treeCon->ses->server) {
                                                                 cFYI(1, ("found matching uid substitute right smb_uid"));
                                                                 buffer->Uid = ses->Suid;