v4.19.13 snapshot.
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
new file mode 100644
index 0000000..9101f62
--- /dev/null
+++ b/fs/afs/proc.c
@@ -0,0 +1,645 @@
+/* /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 <linux/uaccess.h>
+#include "internal.h"
+
+static inline struct afs_net *afs_seq2net(struct seq_file *m)
+{
+ return afs_net(seq_file_net(m));
+}
+
+static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
+{
+ return afs_net(seq_file_single_net(m));
+}
+
+/*
+ * Display the list of cells known to the namespace.
+ */
+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 == SEQ_START_TOKEN) {
+ /* display header on line 1 */
+ seq_puts(m, "USE NAME\n");
+ return 0;
+ }
+
+ /* display one cell per line on subsequent lines */
+ seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
+ return 0;
+}
+
+static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
+ __acquires(rcu)
+{
+ rcu_read_lock();
+ return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
+}
+
+static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
+}
+
+static void afs_proc_cells_stop(struct seq_file *m, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+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,
+};
+
+/*
+ * handle writes to /proc/fs/afs/cells
+ * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
+ */
+static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
+{
+ struct seq_file *m = file->private_data;
+ struct afs_net *net = afs_seq2net(m);
+ char *name, *args;
+ int ret;
+
+ /* trim to first NL */
+ name = memchr(buf, '\n', size);
+ if (name)
+ *name = 0;
+
+ /* split into command, name and argslist */
+ name = strchr(buf, ' ');
+ if (!name)
+ goto inval;
+ do {
+ *name++ = 0;
+ } while(*name == ' ');
+ if (!*name)
+ goto inval;
+
+ args = strchr(name, ' ');
+ if (args) {
+ do {
+ *args++ = 0;
+ } while(*args == ' ');
+ if (!*args)
+ goto inval;
+ }
+
+ /* determine command to perform */
+ _debug("cmd=%s name=%s args=%s", buf, name, args);
+
+ if (strcmp(buf, "add") == 0) {
+ struct afs_cell *cell;
+
+ cell = afs_lookup_cell(net, name, strlen(name), args, true);
+ if (IS_ERR(cell)) {
+ ret = PTR_ERR(cell);
+ goto done;
+ }
+
+ if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
+ afs_put_cell(net, cell);
+ } else {
+ goto inval;
+ }
+
+ ret = 0;
+
+done:
+ _leave(" = %d", ret);
+ return ret;
+
+inval:
+ ret = -EINVAL;
+ printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
+ goto done;
+}
+
+/*
+ * Display the name of the current workstation cell.
+ */
+static int afs_proc_rootcell_show(struct seq_file *m, void *v)
+{
+ struct afs_cell *cell;
+ struct afs_net *net;
+
+ net = afs_seq2net_single(m);
+ if (rcu_access_pointer(net->ws_cell)) {
+ rcu_read_lock();
+ cell = rcu_dereference(net->ws_cell);
+ if (cell)
+ seq_printf(m, "%s\n", cell->name);
+ rcu_read_unlock();
+ }
+ return 0;
+}
+
+/*
+ * Set the current workstation cell and optionally supply its list of volume
+ * location servers.
+ *
+ * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
+ */
+static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
+{
+ struct seq_file *m = file->private_data;
+ struct afs_net *net = afs_seq2net_single(m);
+ char *s;
+ int ret;
+
+ ret = -EINVAL;
+ if (buf[0] == '.')
+ goto out;
+ if (memchr(buf, '/', size))
+ goto out;
+
+ /* trim to first NL */
+ s = memchr(buf, '\n', size);
+ if (s)
+ *s = 0;
+
+ /* determine command to perform */
+ _debug("rootcell=%s", buf);
+
+ ret = afs_cell_init(net, buf);
+
+out:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+static const char afs_vol_types[3][3] = {
+ [AFSVL_RWVOL] = "RW",
+ [AFSVL_ROVOL] = "RO",
+ [AFSVL_BACKVOL] = "BK",
+};
+
+/*
+ * Display the list of volumes known to a cell.
+ */
+static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
+{
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
+
+ /* Display header on line 1 */
+ if (v == &cell->proc_volumes) {
+ seq_puts(m, "USE VID TY\n");
+ return 0;
+ }
+
+ seq_printf(m, "%3d %08x %s\n",
+ atomic_read(&vol->usage), vol->vid,
+ afs_vol_types[vol->type]);
+
+ return 0;
+}
+
+static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
+ __acquires(cell->proc_lock)
+{
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+
+ read_lock(&cell->proc_lock);
+ return seq_list_start_head(&cell->proc_volumes, *_pos);
+}
+
+static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
+ loff_t *_pos)
+{
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+
+ return seq_list_next(v, &cell->proc_volumes, _pos);
+}
+
+static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
+ __releases(cell->proc_lock)
+{
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+
+ read_unlock(&cell->proc_lock);
+}
+
+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,
+};
+
+/*
+ * Display the list of Volume Location servers we're using for a cell.
+ */
+static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
+{
+ struct sockaddr_rxrpc *addr = v;
+
+ /* display header on line 1 */
+ if (v == (void *)1) {
+ seq_puts(m, "ADDRESS\n");
+ return 0;
+ }
+
+ /* display one cell per line on subsequent lines */
+ seq_printf(m, "%pISp\n", &addr->transport);
+ return 0;
+}
+
+static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
+ __acquires(rcu)
+{
+ struct afs_addr_list *alist;
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ loff_t pos = *_pos;
+
+ rcu_read_lock();
+
+ alist = rcu_dereference(cell->vl_addrs);
+
+ /* allow for the header line */
+ if (!pos)
+ return (void *) 1;
+ pos--;
+
+ if (!alist || pos >= alist->nr_addrs)
+ return NULL;
+
+ return alist->addrs + pos;
+}
+
+static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
+ loff_t *_pos)
+{
+ struct afs_addr_list *alist;
+ struct afs_cell *cell = PDE_DATA(file_inode(m->file));
+ loff_t pos;
+
+ alist = rcu_dereference(cell->vl_addrs);
+
+ pos = *_pos;
+ (*_pos)++;
+ if (!alist || pos >= alist->nr_addrs)
+ return NULL;
+
+ return alist->addrs + pos;
+}
+
+static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+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,
+};
+
+/*
+ * Display the list of fileservers we're using within a namespace.
+ */
+static int afs_proc_servers_show(struct seq_file *m, void *v)
+{
+ struct afs_server *server;
+ struct afs_addr_list *alist;
+ int i;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(m, "UUID USE ADDR\n");
+ return 0;
+ }
+
+ server = list_entry(v, struct afs_server, proc_link);
+ alist = rcu_dereference(server->addresses);
+ seq_printf(m, "%pU %3d %pISpc%s\n",
+ &server->uuid,
+ atomic_read(&server->usage),
+ &alist->addrs[0].transport,
+ alist->index == 0 ? "*" : "");
+ for (i = 1; i < alist->nr_addrs; i++)
+ seq_printf(m, " %pISpc%s\n",
+ &alist->addrs[i].transport,
+ alist->index == i ? "*" : "");
+ return 0;
+}
+
+static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
+ __acquires(rcu)
+{
+ rcu_read_lock();
+ return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
+}
+
+static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
+{
+ return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
+}
+
+static void afs_proc_servers_stop(struct seq_file *m, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+static const struct seq_operations afs_proc_servers_ops = {
+ .start = afs_proc_servers_start,
+ .next = afs_proc_servers_next,
+ .stop = afs_proc_servers_stop,
+ .show = afs_proc_servers_show,
+};
+
+/*
+ * Display the list of strings that may be substituted for the @sys pathname
+ * macro.
+ */
+static int afs_proc_sysname_show(struct seq_file *m, void *v)
+{
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *sysnames = net->sysnames;
+ unsigned int i = (unsigned long)v - 1;
+
+ if (i < sysnames->nr)
+ seq_printf(m, "%s\n", sysnames->subs[i]);
+ return 0;
+}
+
+static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
+ __acquires(&net->sysnames_lock)
+{
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *names;
+
+ read_lock(&net->sysnames_lock);
+
+ names = net->sysnames;
+ if (*pos >= names->nr)
+ return NULL;
+ return (void *)(unsigned long)(*pos + 1);
+}
+
+static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *names = net->sysnames;
+
+ *pos += 1;
+ if (*pos >= names->nr)
+ return NULL;
+ return (void *)(unsigned long)(*pos + 1);
+}
+
+static void afs_proc_sysname_stop(struct seq_file *m, void *v)
+ __releases(&net->sysnames_lock)
+{
+ struct afs_net *net = afs_seq2net(m);
+
+ read_unlock(&net->sysnames_lock);
+}
+
+static const struct seq_operations afs_proc_sysname_ops = {
+ .start = afs_proc_sysname_start,
+ .next = afs_proc_sysname_next,
+ .stop = afs_proc_sysname_stop,
+ .show = afs_proc_sysname_show,
+};
+
+/*
+ * Allow the @sys substitution to be configured.
+ */
+static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
+{
+ struct afs_sysnames *sysnames, *kill;
+ struct seq_file *m = file->private_data;
+ struct afs_net *net = afs_seq2net(m);
+ char *s, *p, *sub;
+ int ret, len;
+
+ sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
+ if (!sysnames)
+ return -ENOMEM;
+ refcount_set(&sysnames->usage, 1);
+ kill = sysnames;
+
+ p = buf;
+ while ((s = strsep(&p, " \t\n"))) {
+ len = strlen(s);
+ if (len == 0)
+ continue;
+ ret = -ENAMETOOLONG;
+ if (len >= AFSNAMEMAX)
+ goto error;
+
+ if (len >= 4 &&
+ s[len - 4] == '@' &&
+ s[len - 3] == 's' &&
+ s[len - 2] == 'y' &&
+ s[len - 1] == 's')
+ /* Protect against recursion */
+ goto invalid;
+
+ if (s[0] == '.' &&
+ (len < 2 || (len == 2 && s[1] == '.')))
+ goto invalid;
+
+ if (memchr(s, '/', len))
+ goto invalid;
+
+ ret = -EFBIG;
+ if (sysnames->nr >= AFS_NR_SYSNAME)
+ goto out;
+
+ if (strcmp(s, afs_init_sysname) == 0) {
+ sub = (char *)afs_init_sysname;
+ } else {
+ ret = -ENOMEM;
+ sub = kmemdup(s, len + 1, GFP_KERNEL);
+ if (!sub)
+ goto out;
+ }
+
+ sysnames->subs[sysnames->nr] = sub;
+ sysnames->nr++;
+ }
+
+ if (sysnames->nr == 0) {
+ sysnames->subs[0] = sysnames->blank;
+ sysnames->nr++;
+ }
+
+ write_lock(&net->sysnames_lock);
+ kill = net->sysnames;
+ net->sysnames = sysnames;
+ write_unlock(&net->sysnames_lock);
+ ret = 0;
+out:
+ afs_put_sysnames(kill);
+ return ret;
+
+invalid:
+ ret = -EINVAL;
+error:
+ goto out;
+}
+
+void afs_put_sysnames(struct afs_sysnames *sysnames)
+{
+ int i;
+
+ if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
+ for (i = 0; i < sysnames->nr; i++)
+ if (sysnames->subs[i] != afs_init_sysname &&
+ sysnames->subs[i] != sysnames->blank)
+ kfree(sysnames->subs[i]);
+ }
+}
+
+/*
+ * Display general per-net namespace statistics
+ */
+static int afs_proc_stats_show(struct seq_file *m, void *v)
+{
+ struct afs_net *net = afs_seq2net_single(m);
+
+ seq_puts(m, "kAFS statistics\n");
+
+ seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
+ atomic_read(&net->n_lookup),
+ atomic_read(&net->n_reval),
+ atomic_read(&net->n_inval),
+ atomic_read(&net->n_relpg));
+
+ seq_printf(m, "dir-data: rdpg=%u\n",
+ atomic_read(&net->n_read_dir));
+
+ seq_printf(m, "dir-edit: cr=%u rm=%u\n",
+ atomic_read(&net->n_dir_cr),
+ atomic_read(&net->n_dir_rm));
+
+ seq_printf(m, "file-rd : n=%u nb=%lu\n",
+ atomic_read(&net->n_fetches),
+ atomic_long_read(&net->n_fetch_bytes));
+ seq_printf(m, "file-wr : n=%u nb=%lu\n",
+ atomic_read(&net->n_stores),
+ atomic_long_read(&net->n_store_bytes));
+ return 0;
+}
+
+/*
+ * initialise /proc/fs/afs/<cell>/
+ */
+int afs_proc_cell_setup(struct afs_cell *cell)
+{
+ struct proc_dir_entry *dir;
+ struct afs_net *net = cell->net;
+
+ _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
+
+ dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
+ if (!dir)
+ goto error_dir;
+
+ if (!proc_create_net_data("vlservers", 0444, dir,
+ &afs_proc_cell_vlservers_ops,
+ sizeof(struct seq_net_private),
+ cell) ||
+ !proc_create_net_data("volumes", 0444, dir,
+ &afs_proc_cell_volumes_ops,
+ sizeof(struct seq_net_private),
+ cell))
+ goto error_tree;
+
+ _leave(" = 0");
+ return 0;
+
+error_tree:
+ remove_proc_subtree(cell->name, net->proc_afs);
+error_dir:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+
+/*
+ * remove /proc/fs/afs/<cell>/
+ */
+void afs_proc_cell_remove(struct afs_cell *cell)
+{
+ struct afs_net *net = cell->net;
+
+ _enter("");
+ remove_proc_subtree(cell->name, net->proc_afs);
+ _leave("");
+}
+
+/*
+ * initialise the /proc/fs/afs/ directory
+ */
+int afs_proc_init(struct afs_net *net)
+{
+ struct proc_dir_entry *p;
+
+ _enter("");
+
+ p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
+ if (!p)
+ goto error_dir;
+
+ if (!proc_create_net_data_write("cells", 0644, p,
+ &afs_proc_cells_ops,
+ afs_proc_cells_write,
+ sizeof(struct seq_net_private),
+ NULL) ||
+ !proc_create_net_single_write("rootcell", 0644, p,
+ afs_proc_rootcell_show,
+ afs_proc_rootcell_write,
+ NULL) ||
+ !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
+ sizeof(struct seq_net_private)) ||
+ !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
+ !proc_create_net_data_write("sysname", 0644, p,
+ &afs_proc_sysname_ops,
+ afs_proc_sysname_write,
+ sizeof(struct seq_net_private),
+ NULL))
+ goto error_tree;
+
+ net->proc_afs = p;
+ _leave(" = 0");
+ return 0;
+
+error_tree:
+ proc_remove(p);
+error_dir:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+
+/*
+ * clean up the /proc/fs/afs/ directory
+ */
+void afs_proc_cleanup(struct afs_net *net)
+{
+ proc_remove(net->proc_afs);
+ net->proc_afs = NULL;
+}