initial_commit

1 files changed, 744 insertions, 0 deletions

diff --git a/fs/afs/proc.c b/fs/afs/proc.c
new file mode 100644
index 00000000..096b23f8
--- /dev/null
+++ b/fs/afs/proc.c
@@ -0,0 +1,744 @@
+/* /proc interface for AFS
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+#include "internal.h"
+
+static struct proc_dir_entry *proc_afs;
+
+
+static int afs_proc_cells_open(struct inode *inode, struct file *file);
+static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
+static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
+static void afs_proc_cells_stop(struct seq_file *p, void *v);
+static int afs_proc_cells_show(struct seq_file *m, void *v);
+static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
+				    size_t size, loff_t *_pos);
+
+static const struct seq_operations afs_proc_cells_ops = {
+	.start	= afs_proc_cells_start,
+	.next	= afs_proc_cells_next,
+	.stop	= afs_proc_cells_stop,
+	.show	= afs_proc_cells_show,
+};
+
+static const struct file_operations afs_proc_cells_fops = {
+	.open		= afs_proc_cells_open,
+	.read		= seq_read,
+	.write		= afs_proc_cells_write,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+	.owner		= THIS_MODULE,
+};
+
+static int afs_proc_rootcell_open(struct inode *inode, struct file *file);
+static int afs_proc_rootcell_release(struct inode *inode, struct file *file);
+static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
+				      size_t size, loff_t *_pos);
+static ssize_t afs_proc_rootcell_write(struct file *file,
+				       const char __user *buf,
+				       size_t size, loff_t *_pos);
+
+static const struct file_operations afs_proc_rootcell_fops = {
+	.open		= afs_proc_rootcell_open,
+	.read		= afs_proc_rootcell_read,
+	.write		= afs_proc_rootcell_write,
+	.llseek		= no_llseek,
+	.release	= afs_proc_rootcell_release,
+	.owner		= THIS_MODULE,
+};
+
+static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
+static int afs_proc_cell_volumes_release(struct inode *inode,
+					 struct file *file);
+static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
+static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
+					loff_t *pos);
+static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
+static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
+
+static const struct seq_operations afs_proc_cell_volumes_ops = {
+	.start	= afs_proc_cell_volumes_start,
+	.next	= afs_proc_cell_volumes_next,
+	.stop	= afs_proc_cell_volumes_stop,
+	.show	= afs_proc_cell_volumes_show,
+};
+
+static const struct file_operations afs_proc_cell_volumes_fops = {
+	.open		= afs_proc_cell_volumes_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= afs_proc_cell_volumes_release,
+	.owner		= THIS_MODULE,
+};
+
+static int afs_proc_cell_vlservers_open(struct inode *inode,
+					struct file *file);
+static int afs_proc_cell_vlservers_release(struct inode *inode,
+					   struct file *file);
+static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
+static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
+					  loff_t *pos);
+static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
+static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
+
+static const struct seq_operations afs_proc_cell_vlservers_ops = {
+	.start	= afs_proc_cell_vlservers_start,
+	.next	= afs_proc_cell_vlservers_next,
+	.stop	= afs_proc_cell_vlservers_stop,
+	.show	= afs_proc_cell_vlservers_show,
+};
+
+static const struct file_operations afs_proc_cell_vlservers_fops = {
+	.open		= afs_proc_cell_vlservers_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= afs_proc_cell_vlservers_release,
+	.owner		= THIS_MODULE,
+};
+
+static int afs_proc_cell_servers_open(struct inode *inode, struct file *file);
+static int afs_proc_cell_servers_release(struct inode *inode,
+					 struct file *file);
+static void *afs_proc_cell_servers_start(struct seq_file *p, loff_t *pos);
+static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
+					loff_t *pos);
+static void afs_proc_cell_servers_stop(struct seq_file *p, void *v);
+static int afs_proc_cell_servers_show(struct seq_file *m, void *v);
+
+static const struct seq_operations afs_proc_cell_servers_ops = {
+	.start	= afs_proc_cell_servers_start,
+	.next	= afs_proc_cell_servers_next,
+	.stop	= afs_proc_cell_servers_stop,
+	.show	= afs_proc_cell_servers_show,
+};
+
+static const struct file_operations afs_proc_cell_servers_fops = {
+	.open		= afs_proc_cell_servers_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= afs_proc_cell_servers_release,
+	.owner		= THIS_MODULE,
+};
+
+/*
+ * initialise the /proc/fs/afs/ directory
+ */
+int afs_proc_init(void)
+{
+	struct proc_dir_entry *p;
+
+	_enter("");
+
+	proc_afs = proc_mkdir("fs/afs", NULL);
+	if (!proc_afs)
+		goto error_dir;
+
+	p = proc_create("cells", 0, proc_afs, &afs_proc_cells_fops);
+	if (!p)
+		goto error_cells;
+
+	p = proc_create("rootcell", 0, proc_afs, &afs_proc_rootcell_fops);
+	if (!p)
+		goto error_rootcell;
+
+	_leave(" = 0");
+	return 0;
+
+error_rootcell:
+ 	remove_proc_entry("cells", proc_afs);
+error_cells:
+	remove_proc_entry("fs/afs", NULL);
+error_dir:
+	_leave(" = -ENOMEM");
+	return -ENOMEM;
+}
+
+/*
+ * clean up the /proc/fs/afs/ directory
+ */
+void afs_proc_cleanup(void)
+{
+	remove_proc_entry("rootcell", proc_afs);
+	remove_proc_entry("cells", proc_afs);
+	remove_proc_entry("fs/afs", NULL);
+}
+
+/*
+ * open "/proc/fs/afs/cells" which provides a summary of extant cells
+ */
+static int afs_proc_cells_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *m;
+	int ret;
+
+	ret = seq_open(file, &afs_proc_cells_ops);
+	if (ret < 0)
+		return ret;
+
+	m = file->private_data;
+	m->private = PDE(inode)->data;
+
+	return 0;
+}
+
+/*
+ * set up the iterator to start reading from the cells list and return the
+ * first item
+ */
+static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
+{
+	/* lock the list against modification */
+	down_read(&afs_proc_cells_sem);
+	return seq_list_start_head(&afs_proc_cells, *_pos);
+}
+
+/*
+ * move to next cell in cells list
+ */
+static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos)
+{
+	return seq_list_next(v, &afs_proc_cells, pos);
+}
+
+/*
+ * clean up after reading from the cells list
+ */
+static void afs_proc_cells_stop(struct seq_file *p, void *v)
+{
+	up_read(&afs_proc_cells_sem);
+}
+
+/*
+ * display a header line followed by a load of cell lines
+ */
+static int afs_proc_cells_show(struct seq_file *m, void *v)
+{
+	struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
+
+	if (v == &afs_proc_cells) {
+		/* display header on line 1 */
+		seq_puts(m, "USE NAME\n");
+		return 0;
+	}
+
+	/* display one cell per line on subsequent lines */
+	seq_printf(m, "%3d %s\n",
+		   atomic_read(&cell->usage), cell->name);
+	return 0;
+}
+
+/*
+ * handle writes to /proc/fs/afs/cells
+ * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
+ */
+static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
+				    size_t size, loff_t *_pos)
+{
+	char *kbuf, *name, *args;
+	int ret;
+
+	/* start by dragging the command into memory */
+	if (size <= 1 || size >= PAGE_SIZE)
+		return -EINVAL;
+
+	kbuf = kmalloc(size + 1, GFP_KERNEL);
+	if (!kbuf)
+		return -ENOMEM;
+
+	ret = -EFAULT;
+	if (copy_from_user(kbuf, buf, size) != 0)
+		goto done;
+	kbuf[size] = 0;
+
+	/* trim to first NL */
+	name = memchr(kbuf, '\n', size);
+	if (name)
+		*name = 0;
+
+	/* split into command, name and argslist */
+	name = strchr(kbuf, ' ');
+	if (!name)
+		goto inval;
+	do {
+		*name++ = 0;
+	} while(*name == ' ');
+	if (!*name)
+		goto inval;
+
+	args = strchr(name, ' ');
+	if (!args)
+		goto inval;
+	do {
+		*args++ = 0;
+	} while(*args == ' ');
+	if (!*args)
+		goto inval;
+
+	/* determine command to perform */
+	_debug("cmd=%s name=%s args=%s", kbuf, name, args);
+
+	if (strcmp(kbuf, "add") == 0) {
+		struct afs_cell *cell;
+
+		cell = afs_cell_create(name, strlen(name), args, false);
+		if (IS_ERR(cell)) {
+			ret = PTR_ERR(cell);
+			goto done;
+		}
+
+		afs_put_cell(cell);
+		printk("kAFS: Added new cell '%s'\n", name);
+	} else {
+		goto inval;
+	}
+
+	ret = size;
+
+done:
+	kfree(kbuf);
+	_leave(" = %d", ret);
+	return ret;
+
+inval:
+	ret = -EINVAL;
+	printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
+	goto done;
+}
+
+/*
+ * Stubs for /proc/fs/afs/rootcell
+ */
+static int afs_proc_rootcell_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int afs_proc_rootcell_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
+				      size_t size, loff_t *_pos)
+{
+	return 0;
+}
+
+/*
+ * handle writes to /proc/fs/afs/rootcell
+ * - to initialize rootcell: echo "cell.name:192.168.231.14"
+ */
+static ssize_t afs_proc_rootcell_write(struct file *file,
+				       const char __user *buf,
+				       size_t size, loff_t *_pos)
+{
+	char *kbuf, *s;
+	int ret;
+
+	/* start by dragging the command into memory */
+	if (size <= 1 || size >= PAGE_SIZE)
+		return -EINVAL;
+
+	ret = -ENOMEM;
+	kbuf = kmalloc(size + 1, GFP_KERNEL);
+	if (!kbuf)
+		goto nomem;
+
+	ret = -EFAULT;
+	if (copy_from_user(kbuf, buf, size) != 0)
+		goto infault;
+	kbuf[size] = 0;
+
+	/* trim to first NL */
+	s = memchr(kbuf, '\n', size);
+	if (s)
+		*s = 0;
+
+	/* determine command to perform */
+	_debug("rootcell=%s", kbuf);
+
+	ret = afs_cell_init(kbuf);
+	if (ret >= 0)
+		ret = size;	/* consume everything, always */
+
+infault:
+	kfree(kbuf);
+nomem:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * initialise /proc/fs/afs/<cell>/
+ */
+int afs_proc_cell_setup(struct afs_cell *cell)
+{
+	struct proc_dir_entry *p;
+
+	_enter("%p{%s}", cell, cell->name);
+
+	cell->proc_dir = proc_mkdir(cell->name, proc_afs);
+	if (!cell->proc_dir)
+		goto error_dir;
+
+	p = proc_create_data("servers", 0, cell->proc_dir,
+			     &afs_proc_cell_servers_fops, cell);
+	if (!p)
+		goto error_servers;
+
+	p = proc_create_data("vlservers", 0, cell->proc_dir,
+			     &afs_proc_cell_vlservers_fops, cell);
+	if (!p)
+		goto error_vlservers;
+
+	p = proc_create_data("volumes", 0, cell->proc_dir,
+			     &afs_proc_cell_volumes_fops, cell);
+	if (!p)
+		goto error_volumes;
+
+	_leave(" = 0");
+	return 0;
+
+error_volumes:
+	remove_proc_entry("vlservers", cell->proc_dir);
+error_vlservers:
+	remove_proc_entry("servers", cell->proc_dir);
+error_servers:
+	remove_proc_entry(cell->name, proc_afs);
+error_dir:
+	_leave(" = -ENOMEM");
+	return -ENOMEM;
+}
+
+/*
+ * remove /proc/fs/afs/<cell>/
+ */
+void afs_proc_cell_remove(struct afs_cell *cell)
+{
+	_enter("");
+
+	remove_proc_entry("volumes", cell->proc_dir);
+	remove_proc_entry("vlservers", cell->proc_dir);
+	remove_proc_entry("servers", cell->proc_dir);
+	remove_proc_entry(cell->name, proc_afs);
+
+	_leave("");
+}
+
+/*
+ * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
+ */
+static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
+{
+	struct afs_cell *cell;
+	struct seq_file *m;
+	int ret;
+
+	cell = PDE(inode)->data;
+	if (!cell)
+		return -ENOENT;
+
+	ret = seq_open(file, &afs_proc_cell_volumes_ops);
+	if (ret < 0)
+		return ret;
+
+	m = file->private_data;
+	m->private = cell;
+
+	return 0;
+}
+
+/*
+ * close the file and release the ref to the cell
+ */
+static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+/*
+ * set up the iterator to start reading from the cells list and return the
+ * first item
+ */
+static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
+{
+	struct afs_cell *cell = m->private;
+
+	_enter("cell=%p pos=%Ld", cell, *_pos);
+
+	/* lock the list against modification */
+	down_read(&cell->vl_sem);
+	return seq_list_start_head(&cell->vl_list, *_pos);
+}
+
+/*
+ * move to next cell in cells list
+ */
+static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
+					loff_t *_pos)
+{
+	struct afs_cell *cell = p->private;
+
+	_enter("cell=%p pos=%Ld", cell, *_pos);
+	return seq_list_next(v, &cell->vl_list, _pos);
+}
+
+/*
+ * clean up after reading from the cells list
+ */
+static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
+{
+	struct afs_cell *cell = p->private;
+
+	up_read(&cell->vl_sem);
+}
+
+static const char afs_vlocation_states[][4] = {
+	[AFS_VL_NEW]			= "New",
+	[AFS_VL_CREATING]		= "Crt",
+	[AFS_VL_VALID]			= "Val",
+	[AFS_VL_NO_VOLUME]		= "NoV",
+	[AFS_VL_UPDATING]		= "Upd",
+	[AFS_VL_VOLUME_DELETED]		= "Del",
+	[AFS_VL_UNCERTAIN]		= "Unc",
+};
+
+/*
+ * display a header line followed by a load of volume lines
+ */
+static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
+{
+	struct afs_cell *cell = m->private;
+	struct afs_vlocation *vlocation =
+		list_entry(v, struct afs_vlocation, link);
+
+	/* display header on line 1 */
+	if (v == &cell->vl_list) {
+		seq_puts(m, "USE STT VLID[0]  VLID[1]  VLID[2]  NAME\n");
+		return 0;
+	}
+
+	/* display one cell per line on subsequent lines */
+	seq_printf(m, "%3d %s %08x %08x %08x %s\n",
+		   atomic_read(&vlocation->usage),
+		   afs_vlocation_states[vlocation->state],
+		   vlocation->vldb.vid[0],
+		   vlocation->vldb.vid[1],
+		   vlocation->vldb.vid[2],
+		   vlocation->vldb.name);
+
+	return 0;
+}
+
+/*
+ * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
+ * location server
+ */
+static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
+{
+	struct afs_cell *cell;
+	struct seq_file *m;
+	int ret;
+
+	cell = PDE(inode)->data;
+	if (!cell)
+		return -ENOENT;
+
+	ret = seq_open(file, &afs_proc_cell_vlservers_ops);
+	if (ret<0)
+		return ret;
+
+	m = file->private_data;
+	m->private = cell;
+
+	return 0;
+}
+
+/*
+ * close the file and release the ref to the cell
+ */
+static int afs_proc_cell_vlservers_release(struct inode *inode,
+					   struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+/*
+ * set up the iterator to start reading from the cells list and return the
+ * first item
+ */
+static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
+{
+	struct afs_cell *cell = m->private;
+	loff_t pos = *_pos;
+
+	_enter("cell=%p pos=%Ld", cell, *_pos);
+
+	/* lock the list against modification */
+	down_read(&cell->vl_sem);
+
+	/* allow for the header line */
+	if (!pos)
+		return (void *) 1;
+	pos--;
+
+	if (pos >= cell->vl_naddrs)
+		return NULL;
+
+	return &cell->vl_addrs[pos];
+}
+
+/*
+ * move to next cell in cells list
+ */
+static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
+					  loff_t *_pos)
+{
+	struct afs_cell *cell = p->private;
+	loff_t pos;
+
+	_enter("cell=%p{nad=%u} pos=%Ld", cell, cell->vl_naddrs, *_pos);
+
+	pos = *_pos;
+	(*_pos)++;
+	if (pos >= cell->vl_naddrs)
+		return NULL;
+
+	return &cell->vl_addrs[pos];
+}
+
+/*
+ * clean up after reading from the cells list
+ */
+static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
+{
+	struct afs_cell *cell = p->private;
+
+	up_read(&cell->vl_sem);
+}
+
+/*
+ * display a header line followed by a load of volume lines
+ */
+static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
+{
+	struct in_addr *addr = v;
+
+	/* display header on line 1 */
+	if (v == (struct in_addr *) 1) {
+		seq_puts(m, "ADDRESS\n");
+		return 0;
+	}
+
+	/* display one cell per line on subsequent lines */
+	seq_printf(m, "%pI4\n", &addr->s_addr);
+	return 0;
+}
+
+/*
+ * open "/proc/fs/afs/<cell>/servers" which provides a summary of active
+ * servers
+ */
+static int afs_proc_cell_servers_open(struct inode *inode, struct file *file)
+{
+	struct afs_cell *cell;
+	struct seq_file *m;
+	int ret;
+
+	cell = PDE(inode)->data;
+	if (!cell)
+		return -ENOENT;
+
+	ret = seq_open(file, &afs_proc_cell_servers_ops);
+	if (ret < 0)
+		return ret;
+
+	m = file->private_data;
+	m->private = cell;
+	return 0;
+}
+
+/*
+ * close the file and release the ref to the cell
+ */
+static int afs_proc_cell_servers_release(struct inode *inode,
+					 struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+/*
+ * set up the iterator to start reading from the cells list and return the
+ * first item
+ */
+static void *afs_proc_cell_servers_start(struct seq_file *m, loff_t *_pos)
+	__acquires(m->private->servers_lock)
+{
+	struct afs_cell *cell = m->private;
+
+	_enter("cell=%p pos=%Ld", cell, *_pos);
+
+	/* lock the list against modification */
+	read_lock(&cell->servers_lock);
+	return seq_list_start_head(&cell->servers, *_pos);
+}
+
+/*
+ * move to next cell in cells list
+ */
+static void *afs_proc_cell_servers_next(struct seq_file *p, void *v,
+					loff_t *_pos)
+{
+	struct afs_cell *cell = p->private;
+
+	_enter("cell=%p pos=%Ld", cell, *_pos);
+	return seq_list_next(v, &cell->servers, _pos);
+}
+
+/*
+ * clean up after reading from the cells list
+ */
+static void afs_proc_cell_servers_stop(struct seq_file *p, void *v)
+	__releases(p->private->servers_lock)
+{
+	struct afs_cell *cell = p->private;
+
+	read_unlock(&cell->servers_lock);
+}
+
+/*
+ * display a header line followed by a load of volume lines
+ */
+static int afs_proc_cell_servers_show(struct seq_file *m, void *v)
+{
+	struct afs_cell *cell = m->private;
+	struct afs_server *server = list_entry(v, struct afs_server, link);
+	char ipaddr[20];
+
+	/* display header on line 1 */
+	if (v == &cell->servers) {
+		seq_puts(m, "USE ADDR            STATE\n");
+		return 0;
+	}
+
+	/* display one cell per line on subsequent lines */
+	sprintf(ipaddr, "%pI4", &server->addr);
+	seq_printf(m, "%3d %-15.15s %5d\n",
+		   atomic_read(&server->usage), ipaddr, server->fs_state);
+
+	return 0;
+}