Per-mount 'config' object

With support for multiple mounts of devpts, the 'config' structure really
represents per-mount options rather than config parameters. Rename 'config'
structure to 'pts_mount_opts' and store it in the super-block.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 27 insertions, 18 deletions

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 49d879d911b1..b793e6e3c21e 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -34,13 +34,13 @@ static DEFINE_MUTEX(allocated_ptys_lock);
 
 static struct vfsmount *devpts_mnt;
 
-static struct {
+struct pts_mount_opts {
         int setuid;
         int setgid;
         uid_t   uid;
         gid_t   gid;
         umode_t mode;
-} config = {.mode = DEVPTS_DEFAULT_MODE};
+};
 
 enum {
         Opt_uid, Opt_gid, Opt_mode,
@@ -56,6 +56,7 @@ static const match_table_t tokens = {
 
 struct pts_fs_info {
         struct ida allocated_ptys;
+        struct pts_mount_opts mount_opts;
 };
 
 static inline struct pts_fs_info *DEVPTS_SB(struct super_block *sb)
@@ -74,12 +75,14 @@ static inline struct super_block *pts_sb_from_inode(struct inode *inode)
 static int devpts_remount(struct super_block *sb, int *flags, char *data)
 {
         char *p;
+        struct pts_fs_info *fsi = DEVPTS_SB(sb);
+        struct pts_mount_opts *opts = &fsi->mount_opts;
 
-        config.setuid  = 0;
-        config.setgid  = 0;
-        config.uid     = 0;
-        config.gid     = 0;
-        config.mode    = DEVPTS_DEFAULT_MODE;
+        opts->setuid  = 0;
+        opts->setgid  = 0;
+        opts->uid     = 0;
+        opts->gid     = 0;
+        opts->mode    = DEVPTS_DEFAULT_MODE;
 
         while ((p = strsep(&data, ",")) != NULL) {
                 substring_t args[MAX_OPT_ARGS];
@@ -94,19 +97,19 @@ static int devpts_remount(struct super_block *sb, int *flags, char *data)
                 case Opt_uid:
                         if (match_int(&args[0], &option))
                                 return -EINVAL;
-                        config.uid = option;
-                        config.setuid = 1;
+                        opts->uid = option;
+                        opts->setuid = 1;
                         break;
                 case Opt_gid:
                         if (match_int(&args[0], &option))
                                 return -EINVAL;
-                        config.gid = option;
-                        config.setgid = 1;
+                        opts->gid = option;
+                        opts->setgid = 1;
                         break;
                 case Opt_mode:
                         if (match_octal(&args[0], &option))
                                 return -EINVAL;
-                        config.mode = option & S_IALLUGO;
+                        opts->mode = option & S_IALLUGO;
                         break;
                 default:
                         printk(KERN_ERR "devpts: called with bogus options\n");
@@ -119,11 +122,14 @@ static int devpts_remount(struct super_block *sb, int *flags, char *data)
 
 static int devpts_show_options(struct seq_file *seq, struct vfsmount *vfs)
 {
-        if (config.setuid)
-                seq_printf(seq, ",uid=%u", config.uid);
-        if (config.setgid)
-                seq_printf(seq, ",gid=%u", config.gid);
-        seq_printf(seq, ",mode=%03o", config.mode);
+        struct pts_fs_info *fsi = DEVPTS_SB(vfs->mnt_sb);
+        struct pts_mount_opts *opts = &fsi->mount_opts;
+
+        if (opts->setuid)
+                seq_printf(seq, ",uid=%u", opts->uid);
+        if (opts->setgid)
+                seq_printf(seq, ",gid=%u", opts->gid);
+        seq_printf(seq, ",mode=%03o", opts->mode);
 
         return 0;
 }
@@ -143,6 +149,7 @@ static void *new_pts_fs_info(void)
                 return NULL;
 
         ida_init(&fsi->allocated_ptys);
+        fsi->mount_opts.mode = DEVPTS_DEFAULT_MODE;
 
         return fsi;
 }
@@ -262,6 +269,8 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
         struct super_block *sb = pts_sb_from_inode(ptmx_inode);
         struct inode *inode = new_inode(sb);
         struct dentry *root = sb->s_root;
+        struct pts_fs_info *fsi = DEVPTS_SB(sb);
+        struct pts_mount_opts *opts = &fsi->mount_opts;
         char s[12];
 
         /* We're supposed to be given the slave end of a pty */
@@ -275,7 +284,7 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
         inode->i_uid = config.setuid ? config.uid : current_fsuid();
         inode->i_gid = config.setgid ? config.gid : current_fsgid();
         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
-        init_special_inode(inode, S_IFCHR|config.mode, device);
+        init_special_inode(inode, S_IFCHR|opts->mode, device);
         inode->i_private = tty;
         tty->driver_data = inode;