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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/proc/root.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/proc/root.c')
-rw-r--r--fs/proc/root.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
new file mode 100644
index 00000000000..aef148f099a
--- /dev/null
+++ b/fs/proc/root.c
@@ -0,0 +1,161 @@
+/*
+ * linux/fs/proc/root.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * proc root directory handling functions
+ */
+
+#include <asm/uaccess.h>
+
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/smp_lock.h>
+
+struct proc_dir_entry *proc_net, *proc_net_stat, *proc_bus, *proc_root_fs, *proc_root_driver;
+
+#ifdef CONFIG_SYSCTL
+struct proc_dir_entry *proc_sys_root;
+#endif
+
+static struct super_block *proc_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return get_sb_single(fs_type, flags, data, proc_fill_super);
+}
+
+static struct file_system_type proc_fs_type = {
+ .name = "proc",
+ .get_sb = proc_get_sb,
+ .kill_sb = kill_anon_super,
+};
+
+extern int __init proc_init_inodecache(void);
+void __init proc_root_init(void)
+{
+ int err = proc_init_inodecache();
+ if (err)
+ return;
+ err = register_filesystem(&proc_fs_type);
+ if (err)
+ return;
+ proc_mnt = kern_mount(&proc_fs_type);
+ err = PTR_ERR(proc_mnt);
+ if (IS_ERR(proc_mnt)) {
+ unregister_filesystem(&proc_fs_type);
+ return;
+ }
+ proc_misc_init();
+ proc_net = proc_mkdir("net", NULL);
+ proc_net_stat = proc_mkdir("net/stat", NULL);
+
+#ifdef CONFIG_SYSVIPC
+ proc_mkdir("sysvipc", NULL);
+#endif
+#ifdef CONFIG_SYSCTL
+ proc_sys_root = proc_mkdir("sys", NULL);
+#endif
+#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
+ proc_mkdir("sys/fs", NULL);
+ proc_mkdir("sys/fs/binfmt_misc", NULL);
+#endif
+ proc_root_fs = proc_mkdir("fs", NULL);
+ proc_root_driver = proc_mkdir("driver", NULL);
+ proc_mkdir("fs/nfsd", NULL); /* somewhere for the nfsd filesystem to be mounted */
+#if defined(CONFIG_SUN_OPENPROMFS) || defined(CONFIG_SUN_OPENPROMFS_MODULE)
+ /* just give it a mountpoint */
+ proc_mkdir("openprom", NULL);
+#endif
+ proc_tty_init();
+#ifdef CONFIG_PROC_DEVICETREE
+ proc_device_tree_init();
+#endif
+ proc_bus = proc_mkdir("bus", NULL);
+}
+
+static struct dentry *proc_root_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
+{
+ /*
+ * nr_threads is actually protected by the tasklist_lock;
+ * however, it's conventional to do reads, especially for
+ * reporting, without any locking whatsoever.
+ */
+ if (dir->i_ino == PROC_ROOT_INO) /* check for safety... */
+ dir->i_nlink = proc_root.nlink + nr_threads;
+
+ if (!proc_lookup(dir, dentry, nd)) {
+ return NULL;
+ }
+
+ return proc_pid_lookup(dir, dentry, nd);
+}
+
+static int proc_root_readdir(struct file * filp,
+ void * dirent, filldir_t filldir)
+{
+ unsigned int nr = filp->f_pos;
+ int ret;
+
+ lock_kernel();
+
+ if (nr < FIRST_PROCESS_ENTRY) {
+ int error = proc_readdir(filp, dirent, filldir);
+ if (error <= 0) {
+ unlock_kernel();
+ return error;
+ }
+ filp->f_pos = FIRST_PROCESS_ENTRY;
+ }
+ unlock_kernel();
+
+ ret = proc_pid_readdir(filp, dirent, filldir);
+ return ret;
+}
+
+/*
+ * The root /proc directory is special, as it has the
+ * <pid> directories. Thus we don't use the generic
+ * directory handling functions for that..
+ */
+static struct file_operations proc_root_operations = {
+ .read = generic_read_dir,
+ .readdir = proc_root_readdir,
+};
+
+/*
+ * proc root can do almost nothing..
+ */
+static struct inode_operations proc_root_inode_operations = {
+ .lookup = proc_root_lookup,
+};
+
+/*
+ * This is the root "inode" in the /proc tree..
+ */
+struct proc_dir_entry proc_root = {
+ .low_ino = PROC_ROOT_INO,
+ .namelen = 5,
+ .name = "/proc",
+ .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+ .nlink = 2,
+ .proc_iops = &proc_root_inode_operations,
+ .proc_fops = &proc_root_operations,
+ .parent = &proc_root,
+};
+
+EXPORT_SYMBOL(proc_symlink);
+EXPORT_SYMBOL(proc_mkdir);
+EXPORT_SYMBOL(create_proc_entry);
+EXPORT_SYMBOL(remove_proc_entry);
+EXPORT_SYMBOL(proc_root);
+EXPORT_SYMBOL(proc_root_fs);
+EXPORT_SYMBOL(proc_net);
+EXPORT_SYMBOL(proc_net_stat);
+EXPORT_SYMBOL(proc_bus);
+EXPORT_SYMBOL(proc_root_driver);