* devpts "upcalls" eliminated.
* instead of playing games with revalidation we simply use
ramfs-style tree and kill dentries upon devpts_pty_kill(). That
allows to get rid of a lot of code in fs/devpts/*.c.
* devpts_fs.h cleaned up.
* devpts/root.c and devpts/devpts_i.h removed.
* array of pointers to devpts inodes killed; with ramfs-style tree
it's not needed anymore.
* devpts/inode.c cleaned up.
* devpts_pty_new() used to get mk_kdev() only to convert it to
dev_t (hardly a surprise, since it's mknod() in disguise). Now it gets
dev_t as an argument.
diff -urN C24-a/drivers/char/pty.c C24-a-devpts/drivers/char/pty.c
--- C24-a/drivers/char/pty.c Sun Jan 20 10:21:53 2002
+++ C24-a-devpts/drivers/char/pty.c Fri Jul 5 00:01:50 2002
@@ -25,8 +25,6 @@
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
-
-#define BUILDING_PTY_C 1
#include <linux/devpts_fs.h>
struct pty_struct {
diff -urN C24-a/drivers/char/tty_io.c C24-a-devpts/drivers/char/tty_io.c
--- C24-a/drivers/char/tty_io.c Sun Jun 9 23:03:54 2002
+++ C24-a-devpts/drivers/char/tty_io.c Fri Jul 5 00:01:50 2002
@@ -1336,7 +1336,7 @@
ptmx_found:
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
minor -= driver->minor_start;
- devpts_pty_new(driver->other->name_base + minor, mk_kdev(driver->other->major, minor + driver->other->minor_start));
+ devpts_pty_new(driver->other->name_base + minor, MKDEV(driver->other->major, minor + driver->other->minor_start));
tty_register_devfs(&pts_driver[major], DEVFS_FL_DEFAULT,
pts_driver[major].minor_start + minor);
noctty = 1;
diff -urN C24-a/fs/Makefile C24-a-devpts/fs/Makefile
--- C24-a/fs/Makefile Thu Jun 20 13:37:04 2002
+++ C24-a-devpts/fs/Makefile Fri Jul 5 00:01:50 2002
@@ -40,6 +40,7 @@
obj-$(CONFIG_PROC_FS) += proc/
obj-y += partitions/
obj-y += driverfs/
+obj-y += devpts/
# Do not add any filesystems before this line
obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
@@ -81,7 +82,6 @@
obj-$(CONFIG_AUTOFS4_FS) += autofs4/
obj-$(CONFIG_ADFS_FS) += adfs/
obj-$(CONFIG_REISERFS_FS) += reiserfs/
-obj-$(CONFIG_DEVPTS_FS) += devpts/
obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs/
obj-$(CONFIG_JFS_FS) += jfs/
diff -urN C24-a/fs/devpts/Makefile C24-a-devpts/fs/devpts/Makefile
--- C24-a/fs/devpts/Makefile Sat May 25 01:40:57 2002
+++ C24-a-devpts/fs/devpts/Makefile Fri Jul 5 00:01:50 2002
@@ -4,6 +4,6 @@
obj-$(CONFIG_DEVPTS_FS) += devpts.o
-devpts-objs := root.o inode.o
+devpts-objs := inode.o
include $(TOPDIR)/Rules.make
diff -urN C24-a/fs/devpts/devpts_i.h C24-a-devpts/fs/devpts/devpts_i.h
--- C24-a/fs/devpts/devpts_i.h Thu Nov 29 03:00:49 2001
+++ C24-a-devpts/fs/devpts/devpts_i.h Wed Dec 31 19:00:00 1969
@@ -1,41 +0,0 @@
-/* -*- linux-c -*- --------------------------------------------------------- *
- *
- * linux/fs/devpts/devpts_i.h
- *
- * Copyright 1998 H. Peter Anvin -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- *
- * ------------------------------------------------------------------------- */
-
-#include <linux/fs.h>
-#include <linux/tty.h>
-#include <linux/types.h>
-
-#define BUILDING_DEVPTS 1
-#include <linux/devpts_fs.h>
-
-struct devpts_sb_info {
- u32 magic;
- int setuid;
- int setgid;
- uid_t uid;
- gid_t gid;
- umode_t mode;
-
- unsigned int max_ptys;
- struct inode **inodes;
-};
-
-#define DEVPTS_SUPER_MAGIC 0x1cd1
-#define DEVPTS_SBI_MAGIC 0x01da1d02
-
-extern inline struct devpts_sb_info *SBI(struct super_block *sb)
-{
- return (struct devpts_sb_info *)(sb->u.generic_sbp);
-}
-
-extern struct inode_operations devpts_root_inode_operations;
-extern struct file_operations devpts_root_operations;
diff -urN C24-a/fs/devpts/inode.c C24-a-devpts/fs/devpts/inode.c
--- C24-a/fs/devpts/inode.c Tue May 21 20:53:41 2002
+++ C24-a-devpts/fs/devpts/inode.c Fri Jul 5 00:02:21 2002
@@ -11,135 +11,70 @@
* ------------------------------------------------------------------------- */
#include <linux/module.h>
-
-#include <linux/string.h>
-#include <linux/fs.h>
#include <linux/init.h>
-#include <linux/kdev_t.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
-#include <linux/slab.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <asm/bitops.h>
-#include <asm/uaccess.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
-#include "devpts_i.h"
+#define DEVPTS_SUPER_MAGIC 0x1cd1
static struct vfsmount *devpts_mnt;
+static struct dentry *devpts_root;
-static void devpts_put_super(struct super_block *sb)
-{
- struct devpts_sb_info *sbi = SBI(sb);
- struct inode *inode;
- int i;
-
- for ( i = 0 ; i < sbi->max_ptys ; i++ ) {
- if ( (inode = sbi->inodes[i]) ) {
- if ( atomic_read(&inode->i_count) != 1 )
- printk("devpts_put_super: badness: entry %d count %d\n",
- i, atomic_read(&inode->i_count));
- inode->i_nlink--;
- iput(inode);
- }
- }
- kfree(sbi->inodes);
- kfree(sbi);
-}
-
-static int devpts_remount (struct super_block * sb, int * flags, char * data);
-
-static struct super_operations devpts_sops = {
- put_super: devpts_put_super,
- statfs: simple_statfs,
- remount_fs: devpts_remount,
-};
+static struct {
+ int setuid;
+ int setgid;
+ uid_t uid;
+ gid_t gid;
+ umode_t mode;
+} config = {mode: 0600};
-static int devpts_parse_options(char *options, struct devpts_sb_info *sbi)
+static int devpts_remount(struct super_block *sb, int *flags, char *data)
{
int setuid = 0;
int setgid = 0;
uid_t uid = 0;
gid_t gid = 0;
umode_t mode = 0600;
- char *this_char, *value;
+ char *this_char;
this_char = NULL;
- while ((this_char = strsep(&options, ",")) != NULL) {
+ while ((this_char = strsep(&data, ",")) != NULL) {
+ int n;
+ char dummy;
if (!*this_char)
continue;
- if ((value = strchr(this_char,'=')) != NULL)
- *value++ = 0;
- if (!strcmp(this_char,"uid")) {
- if (!value || !*value)
- return 1;
- uid = simple_strtoul(value,&value,0);
- if (*value)
- return 1;
+ if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) {
setuid = 1;
- }
- else if (!strcmp(this_char,"gid")) {
- if (!value || !*value)
- return 1;
- gid = simple_strtoul(value,&value,0);
- if (*value)
- return 1;
+ uid = n;
+ } else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) {
setgid = 1;
+ gid = n;
+ } else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1)
+ mode = n & ~S_IFMT;
+ else {
+ printk("devpts: called with bogus options\n");
+ return -EINVAL;
}
- else if (!strcmp(this_char,"mode")) {
- if (!value || !*value)
- return 1;
- mode = simple_strtoul(value,&value,8);
- if (*value)
- return 1;
- }
- else
- return 1;
}
- sbi->setuid = setuid;
- sbi->setgid = setgid;
- sbi->uid = uid;
- sbi->gid = gid;
- sbi->mode = mode & ~S_IFMT;
+ config.setuid = setuid;
+ config.setgid = setgid;
+ config.uid = uid;
+ config.gid = gid;
+ config.mode = mode;
return 0;
}
-static int devpts_remount(struct super_block * sb, int * flags, char * data)
-{
- struct devpts_sb_info *sbi = sb->u.generic_sbp;
- int res = devpts_parse_options(data,sbi);
- if (res) {
- printk("devpts: called with bogus options\n");
- return -EINVAL;
- }
- return 0;
-}
+static struct super_operations devpts_sops = {
+ statfs: simple_statfs,
+ remount_fs: devpts_remount,
+};
static int devpts_fill_super(struct super_block *s, void *data, int silent)
{
- int error = -ENOMEM;
struct inode * inode;
- struct devpts_sb_info *sbi;
-
- sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
- if ( !sbi )
- goto fail;
- memset(sbi, 0, sizeof(*sbi));
- sbi->magic = DEVPTS_SBI_MAGIC;
- sbi->max_ptys = unix98_max_ptys;
- sbi->inodes = kmalloc(sizeof(struct inode *) * sbi->max_ptys, GFP_KERNEL);
- if ( !sbi->inodes )
- goto fail_free;
- memset(sbi->inodes, 0, sizeof(struct inode *) * sbi->max_ptys);
-
- if ( devpts_parse_options(data,sbi) && !silent) {
- error = -EINVAL;
- printk("devpts: called with bogus options\n");
- goto fail_free;
- }
- s->u.generic_sbp = (void *) sbi;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = DEVPTS_SUPER_MAGIC;
@@ -147,27 +82,25 @@
inode = new_inode(s);
if (!inode)
- goto fail_free;
+ goto fail;
inode->i_ino = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_blocks = 0;
inode->i_blksize = 1024;
inode->i_uid = inode->i_gid = 0;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
- inode->i_op = &devpts_root_inode_operations;
- inode->i_fop = &devpts_root_operations;
+ inode->i_op = &simple_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
inode->i_nlink = 2;
- s->s_root = d_alloc_root(inode);
+ devpts_root = s->s_root = d_alloc_root(inode);
if (s->s_root)
return 0;
printk("devpts: get root dentry failed\n");
iput(inode);
-fail_free:
- kfree(sbi);
fail:
- return error;
+ return -ENOMEM;
}
static struct super_block *devpts_get_sb(struct file_system_type *fs_type,
@@ -183,44 +116,52 @@
kill_sb: kill_anon_super,
};
-void devpts_pty_new(int number, kdev_t device)
+/*
+ * The normal naming convention is simply /dev/pts/<number>; this conforms
+ * to the System V naming convention
+ */
+
+static struct dentry *get_node(int num)
+{
+ char s[10];
+ struct dentry *root = devpts_root;
+ down(&root->d_inode->i_sem);
+ return lookup_one_len(s, root, sprintf(s, "%d", num));
+}
+
+void devpts_pty_new(int number, dev_t device)
{
- struct super_block *sb = devpts_mnt->mnt_sb;
- struct devpts_sb_info *sbi = SBI(sb);
- struct inode *inode;
-
- if ( sbi->inodes[number] )
- return; /* Already registered, this does happen */
-
- inode = new_inode(sb);
+ struct dentry *dentry;
+ struct inode *inode = new_inode(devpts_mnt->mnt_sb);
if (!inode)
return;
inode->i_ino = number+2;
- inode->i_blocks = 0;
inode->i_blksize = 1024;
- inode->i_uid = sbi->setuid ? sbi->uid : current->fsuid;
- inode->i_gid = sbi->setgid ? sbi->gid : current->fsgid;
+ 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|sbi->mode, kdev_t_to_nr(device));
+ init_special_inode(inode, S_IFCHR|config.mode, device);
- if ( sbi->inodes[number] ) {
- iput(inode);
- return;
- }
- sbi->inodes[number] = inode;
+ dentry = get_node(number);
+ if (!IS_ERR(dentry) && !dentry->d_inode)
+ d_instantiate(dentry, inode);
+ up(&devpts_root->d_inode->i_sem);
}
void devpts_pty_kill(int number)
{
- struct super_block *sb = devpts_mnt->mnt_sb;
- struct devpts_sb_info *sbi = SBI(sb);
- struct inode *inode = sbi->inodes[number];
-
- if ( inode ) {
- sbi->inodes[number] = NULL;
- inode->i_nlink--;
- iput(inode);
+ struct dentry *dentry = get_node(number);
+
+ if (!IS_ERR(dentry)) {
+ struct inode *inode = dentry->d_inode;
+ if (inode) {
+ inode->i_nlink--;
+ d_delete(dentry);
+ dput(dentry);
+ }
+ dput(dentry);
}
+ up(&devpts_root->d_inode->i_sem);
}
static int __init init_devpts_fs(void)
@@ -231,22 +172,12 @@
err = PTR_ERR(devpts_mnt);
if (!IS_ERR(devpts_mnt))
err = 0;
-#ifdef MODULE
- if ( !err ) {
- devpts_upcall_new = devpts_pty_new;
- devpts_upcall_kill = devpts_pty_kill;
- }
-#endif
}
return err;
}
static void __exit exit_devpts_fs(void)
{
-#ifdef MODULE
- devpts_upcall_new = NULL;
- devpts_upcall_kill = NULL;
-#endif
unregister_filesystem(&devpts_fs_type);
kern_umount(devpts_mnt);
}
@@ -254,4 +185,3 @@
module_init(init_devpts_fs)
module_exit(exit_devpts_fs)
MODULE_LICENSE("GPL");
-
diff -urN C24-a/fs/devpts/root.c C24-a-devpts/fs/devpts/root.c
--- C24-a/fs/devpts/root.c Tue Apr 30 20:26:58 2002
+++ C24-a-devpts/fs/devpts/root.c Wed Dec 31 19:00:00 1969
@@ -1,142 +0,0 @@
-/* -*- linux-c -*- --------------------------------------------------------- *
- *
- * linux/fs/devpts/root.c
- *
- * Copyright 1998 H. Peter Anvin -- All Rights Reserved
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- *
- * ------------------------------------------------------------------------- */
-
-#include <linux/errno.h>
-#include <linux/stat.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/smp_lock.h>
-#include "devpts_i.h"
-
-static int devpts_root_readdir(struct file *,void *,filldir_t);
-static struct dentry *devpts_root_lookup(struct inode *,struct dentry *);
-static int devpts_revalidate(struct dentry *, int);
-
-struct file_operations devpts_root_operations = {
- read: generic_read_dir,
- readdir: devpts_root_readdir,
-};
-
-struct inode_operations devpts_root_inode_operations = {
- lookup: devpts_root_lookup,
-};
-
-static struct dentry_operations devpts_dentry_operations = {
- d_revalidate: devpts_revalidate,
-};
-
-/*
- * The normal naming convention is simply /dev/pts/<number>; this conforms
- * to the System V naming convention
- */
-
-#define genptsname(buf,num) sprintf(buf, "%d", num)
-
-static int devpts_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct inode * inode = filp->f_dentry->d_inode;
- struct devpts_sb_info * sbi = SBI(filp->f_dentry->d_inode->i_sb);
- off_t nr;
- char numbuf[16];
-
- lock_kernel();
-
- nr = filp->f_pos;
-
- switch(nr)
- {
- case 0:
- if (filldir(dirent, ".", 1, nr, inode->i_ino, DT_DIR) < 0)
- goto out;
- filp->f_pos = ++nr;
- /* fall through */
- case 1:
- if (filldir(dirent, "..", 2, nr, inode->i_ino, DT_DIR) < 0)
- goto out;
- filp->f_pos = ++nr;
- /* fall through */
- default:
- while ( nr - 2 < sbi->max_ptys ) {
- int ptynr = nr - 2;
- if ( sbi->inodes[ptynr] ) {
- genptsname(numbuf, ptynr);
- if ( filldir(dirent, numbuf, strlen(numbuf), nr, nr, DT_CHR) < 0 )
- goto out;
- }
- filp->f_pos = ++nr;
- }
- break;
- }
-
-out:
- unlock_kernel();
- return 0;
-}
-
-/*
- * Revalidate is called on every cache lookup. We use it to check that
- * the pty really does still exist. Never revalidate negative dentries;
- * for simplicity (fix later?)
- */
-static int devpts_revalidate(struct dentry * dentry, int flags)
-{
- struct devpts_sb_info *sbi;
-
- if ( !dentry->d_inode )
- return 0;
-
- sbi = SBI(dentry->d_inode->i_sb);
-
- return ( sbi->inodes[dentry->d_inode->i_ino - 2] == dentry->d_inode );
-}
-
-static struct dentry *devpts_root_lookup(struct inode * dir, struct dentry * dentry)
-{
- struct devpts_sb_info *sbi = SBI(dir->i_sb);
- unsigned int entry;
- int i;
- const char *p;
-
- dentry->d_op = &devpts_dentry_operations;
-
- if ( dentry->d_name.len == 1 && dentry->d_name.name[0] == '0' ) {
- entry = 0;
- } else if ( dentry->d_name.len < 1 ) {
- return NULL;
- } else {
- p = dentry->d_name.name;
- if ( *p < '1' || *p > '9' )
- return NULL;
- entry = *p++ - '0';
-
- for ( i = dentry->d_name.len-1 ; i ; i-- ) {
- unsigned int nentry = *p++ - '0';
- if ( nentry > 9 )
- return NULL;
- if ( entry >= ~0U/10 )
- return NULL;
- entry = nentry + entry * 10;
- }
- }
-
- if ( entry >= sbi->max_ptys )
- return NULL;
-
- lock_kernel();
- if ( sbi->inodes[entry] )
- atomic_inc(&sbi->inodes[entry]->i_count);
-
- d_add(dentry, sbi->inodes[entry]);
- unlock_kernel();
-
- return NULL;
-}
diff -urN C24-a/include/linux/devpts_fs.h C24-a-devpts/include/linux/devpts_fs.h
--- C24-a/include/linux/devpts_fs.h Mon May 27 14:55:03 2002
+++ C24-a-devpts/include/linux/devpts_fs.h Fri Jul 5 00:01:50 2002
@@ -10,64 +10,23 @@
*
* ------------------------------------------------------------------------- */
-/*
- * Prototypes for the pty driver <-> devpts filesystem interface. Most
- * of this is really just a hack so we can exclude it or build it as a
- * module, and probably should go away eventually.
- */
-
#ifndef _LINUX_DEVPTS_FS_H
#define _LINUX_DEVPTS_FS_H 1
-#include <linux/config.h>
-#include <linux/kdev_t.h>
-#include <linux/tty.h>
-
#ifdef CONFIG_DEVPTS_FS
-void devpts_pty_new(int, kdev_t);
-void devpts_pty_kill(int);
-#define unix98_max_ptys NR_PTYS * UNIX98_NR_MAJORS;
-
-#elif defined(CONFIG_DEVPTS_FS_MODULE)
-
-#ifdef BUILDING_PTY_C
-void (*devpts_upcall_new)(int,kdev_t) = NULL;
-void (*devpts_upcall_kill)(int) = NULL;
-unsigned int unix98_max_ptys = NR_PTYS * UNIX98_NR_MAJORS;
+void devpts_pty_new(int, dev_t); /* mknod in devpts */
+void devpts_pty_kill(int); /* unlink */
-EXPORT_SYMBOL(devpts_upcall_new);
-EXPORT_SYMBOL(devpts_upcall_kill);
-EXPORT_SYMBOL(unix98_max_ptys);
#else
-extern void (*devpts_upcall_new)(int,kdev_t);
-extern void (*devpts_upcall_kill)(int);
-extern unsigned int unix98_max_ptys;
-#endif
-#ifndef BUILDING_DEVPTS
-static inline void
-devpts_pty_new(int line, kdev_t device)
+static inline void devpts_pty_new(int line, dev_t device)
{
- if ( devpts_upcall_new )
- return devpts_upcall_new(line,device);
}
-static inline void
-devpts_pty_kill(int line)
+static inline void devpts_pty_kill(int line)
{
- if ( devpts_upcall_kill )
- return devpts_upcall_kill(line);
}
-#endif
-
-#else /* No /dev/pts filesystem at all */
-
-static inline void
-devpts_pty_new(int line, kdev_t device) { }
-
-static inline void
-devpts_pty_kill(int line) { }
#endif
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/