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Per-mount 'config' object

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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>
This commit is contained in:
Sukadev Bhattiprolu 2009-01-02 13:41:33 +00:00 committed by Linus Torvalds
parent e76b7c01e5
commit 31af0abbda
1 changed files with 27 additions and 18 deletions
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45
fs/devpts/inode.c
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@ -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;