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705 lines
16 KiB
705 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* /proc interface for AFS |
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* |
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/sched.h> |
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#include <linux/uaccess.h> |
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#include "internal.h" |
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struct afs_vl_seq_net_private { |
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struct seq_net_private seq; /* Must be first */ |
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struct afs_vlserver_list *vllist; |
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}; |
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static inline struct afs_net *afs_seq2net(struct seq_file *m) |
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{ |
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return afs_net(seq_file_net(m)); |
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} |
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static inline struct afs_net *afs_seq2net_single(struct seq_file *m) |
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{ |
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return afs_net(seq_file_single_net(m)); |
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} |
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/* |
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* Display the list of cells known to the namespace. |
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*/ |
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static int afs_proc_cells_show(struct seq_file *m, void *v) |
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{ |
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struct afs_vlserver_list *vllist; |
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struct afs_cell *cell; |
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if (v == SEQ_START_TOKEN) { |
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/* display header on line 1 */ |
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seq_puts(m, "USE ACT TTL SV ST NAME\n"); |
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return 0; |
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} |
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cell = list_entry(v, struct afs_cell, proc_link); |
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vllist = rcu_dereference(cell->vl_servers); |
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/* display one cell per line on subsequent lines */ |
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seq_printf(m, "%3u %3u %6lld %2u %2u %s\n", |
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atomic_read(&cell->ref), |
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atomic_read(&cell->active), |
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cell->dns_expiry - ktime_get_real_seconds(), |
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vllist ? vllist->nr_servers : 0, |
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cell->state, |
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cell->name); |
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return 0; |
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} |
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static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos) |
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__acquires(rcu) |
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{ |
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rcu_read_lock(); |
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return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos); |
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} |
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static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos) |
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{ |
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return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos); |
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} |
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static void afs_proc_cells_stop(struct seq_file *m, void *v) |
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__releases(rcu) |
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{ |
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rcu_read_unlock(); |
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} |
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static const struct seq_operations afs_proc_cells_ops = { |
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.start = afs_proc_cells_start, |
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.next = afs_proc_cells_next, |
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.stop = afs_proc_cells_stop, |
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.show = afs_proc_cells_show, |
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}; |
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/* |
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* handle writes to /proc/fs/afs/cells |
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* - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]" |
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*/ |
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static int afs_proc_cells_write(struct file *file, char *buf, size_t size) |
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{ |
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struct seq_file *m = file->private_data; |
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struct afs_net *net = afs_seq2net(m); |
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char *name, *args; |
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int ret; |
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/* trim to first NL */ |
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name = memchr(buf, '\n', size); |
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if (name) |
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*name = 0; |
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/* split into command, name and argslist */ |
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name = strchr(buf, ' '); |
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if (!name) |
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goto inval; |
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do { |
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*name++ = 0; |
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} while(*name == ' '); |
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if (!*name) |
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goto inval; |
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args = strchr(name, ' '); |
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if (args) { |
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do { |
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*args++ = 0; |
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} while(*args == ' '); |
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if (!*args) |
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goto inval; |
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} |
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/* determine command to perform */ |
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_debug("cmd=%s name=%s args=%s", buf, name, args); |
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if (strcmp(buf, "add") == 0) { |
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struct afs_cell *cell; |
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cell = afs_lookup_cell(net, name, strlen(name), args, true); |
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if (IS_ERR(cell)) { |
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ret = PTR_ERR(cell); |
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goto done; |
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} |
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if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags)) |
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afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin); |
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} else { |
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goto inval; |
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} |
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ret = 0; |
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done: |
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_leave(" = %d", ret); |
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return ret; |
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inval: |
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ret = -EINVAL; |
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printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n"); |
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goto done; |
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} |
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/* |
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* Display the name of the current workstation cell. |
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*/ |
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static int afs_proc_rootcell_show(struct seq_file *m, void *v) |
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{ |
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struct afs_cell *cell; |
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struct afs_net *net; |
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net = afs_seq2net_single(m); |
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down_read(&net->cells_lock); |
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cell = net->ws_cell; |
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if (cell) |
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seq_printf(m, "%s\n", cell->name); |
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up_read(&net->cells_lock); |
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return 0; |
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} |
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/* |
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* Set the current workstation cell and optionally supply its list of volume |
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* location servers. |
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* |
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* echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell |
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*/ |
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static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size) |
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{ |
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struct seq_file *m = file->private_data; |
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struct afs_net *net = afs_seq2net_single(m); |
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char *s; |
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int ret; |
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ret = -EINVAL; |
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if (buf[0] == '.') |
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goto out; |
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if (memchr(buf, '/', size)) |
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goto out; |
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/* trim to first NL */ |
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s = memchr(buf, '\n', size); |
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if (s) |
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*s = 0; |
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/* determine command to perform */ |
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_debug("rootcell=%s", buf); |
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ret = afs_cell_init(net, buf); |
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out: |
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_leave(" = %d", ret); |
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return ret; |
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} |
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static const char afs_vol_types[3][3] = { |
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[AFSVL_RWVOL] = "RW", |
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[AFSVL_ROVOL] = "RO", |
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[AFSVL_BACKVOL] = "BK", |
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}; |
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/* |
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* Display the list of volumes known to a cell. |
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*/ |
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static int afs_proc_cell_volumes_show(struct seq_file *m, void *v) |
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{ |
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struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link); |
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/* Display header on line 1 */ |
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if (v == SEQ_START_TOKEN) { |
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seq_puts(m, "USE VID TY NAME\n"); |
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return 0; |
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} |
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seq_printf(m, "%3d %08llx %s %s\n", |
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atomic_read(&vol->usage), vol->vid, |
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afs_vol_types[vol->type], |
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vol->name); |
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return 0; |
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} |
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static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos) |
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__acquires(cell->proc_lock) |
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{ |
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struct afs_cell *cell = PDE_DATA(file_inode(m->file)); |
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rcu_read_lock(); |
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return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos); |
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} |
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static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v, |
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loff_t *_pos) |
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{ |
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struct afs_cell *cell = PDE_DATA(file_inode(m->file)); |
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return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos); |
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} |
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static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v) |
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__releases(cell->proc_lock) |
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{ |
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rcu_read_unlock(); |
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} |
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static const struct seq_operations afs_proc_cell_volumes_ops = { |
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.start = afs_proc_cell_volumes_start, |
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.next = afs_proc_cell_volumes_next, |
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.stop = afs_proc_cell_volumes_stop, |
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.show = afs_proc_cell_volumes_show, |
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}; |
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static const char *const dns_record_sources[NR__dns_record_source + 1] = { |
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[DNS_RECORD_UNAVAILABLE] = "unav", |
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[DNS_RECORD_FROM_CONFIG] = "cfg", |
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[DNS_RECORD_FROM_DNS_A] = "A", |
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[DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB", |
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[DNS_RECORD_FROM_DNS_SRV] = "SRV", |
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[DNS_RECORD_FROM_NSS] = "nss", |
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[NR__dns_record_source] = "[weird]" |
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}; |
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static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = { |
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[DNS_LOOKUP_NOT_DONE] = "no-lookup", |
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[DNS_LOOKUP_GOOD] = "good", |
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[DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad", |
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[DNS_LOOKUP_BAD] = "bad", |
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[DNS_LOOKUP_GOT_NOT_FOUND] = "not-found", |
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[DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure", |
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[DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure", |
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[DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure", |
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[NR__dns_lookup_status] = "[weird]" |
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}; |
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/* |
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* Display the list of Volume Location servers we're using for a cell. |
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*/ |
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static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v) |
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{ |
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const struct afs_vl_seq_net_private *priv = m->private; |
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const struct afs_vlserver_list *vllist = priv->vllist; |
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const struct afs_vlserver_entry *entry; |
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const struct afs_vlserver *vlserver; |
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const struct afs_addr_list *alist; |
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int i; |
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if (v == SEQ_START_TOKEN) { |
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seq_printf(m, "# source %s, status %s\n", |
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dns_record_sources[vllist ? vllist->source : 0], |
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dns_lookup_statuses[vllist ? vllist->status : 0]); |
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return 0; |
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} |
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entry = v; |
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vlserver = entry->server; |
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alist = rcu_dereference(vlserver->addresses); |
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seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n", |
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vlserver->name, entry->priority, entry->weight, |
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dns_record_sources[alist ? alist->source : entry->source], |
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dns_lookup_statuses[alist ? alist->status : entry->status]); |
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if (alist) { |
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for (i = 0; i < alist->nr_addrs; i++) |
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seq_printf(m, " %c %pISpc\n", |
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alist->preferred == i ? '>' : '-', |
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&alist->addrs[i].transport); |
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} |
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seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt); |
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seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n", |
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vlserver->probe.flags, vlserver->probe.error, |
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vlserver->probe.abort_code, |
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atomic_read(&vlserver->probe_outstanding)); |
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return 0; |
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} |
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static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos) |
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__acquires(rcu) |
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{ |
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struct afs_vl_seq_net_private *priv = m->private; |
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struct afs_vlserver_list *vllist; |
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struct afs_cell *cell = PDE_DATA(file_inode(m->file)); |
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loff_t pos = *_pos; |
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rcu_read_lock(); |
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vllist = rcu_dereference(cell->vl_servers); |
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priv->vllist = vllist; |
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if (pos < 0) |
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*_pos = pos = 0; |
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if (pos == 0) |
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return SEQ_START_TOKEN; |
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if (pos - 1 >= vllist->nr_servers) |
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return NULL; |
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return &vllist->servers[pos - 1]; |
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} |
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static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v, |
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loff_t *_pos) |
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{ |
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struct afs_vl_seq_net_private *priv = m->private; |
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struct afs_vlserver_list *vllist = priv->vllist; |
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loff_t pos; |
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pos = *_pos; |
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pos++; |
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*_pos = pos; |
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if (!vllist || pos - 1 >= vllist->nr_servers) |
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return NULL; |
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return &vllist->servers[pos - 1]; |
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} |
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static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v) |
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__releases(rcu) |
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{ |
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rcu_read_unlock(); |
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} |
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static const struct seq_operations afs_proc_cell_vlservers_ops = { |
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.start = afs_proc_cell_vlservers_start, |
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.next = afs_proc_cell_vlservers_next, |
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.stop = afs_proc_cell_vlservers_stop, |
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.show = afs_proc_cell_vlservers_show, |
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}; |
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/* |
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* Display the list of fileservers we're using within a namespace. |
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*/ |
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static int afs_proc_servers_show(struct seq_file *m, void *v) |
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{ |
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struct afs_server *server; |
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struct afs_addr_list *alist; |
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int i; |
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if (v == SEQ_START_TOKEN) { |
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seq_puts(m, "UUID REF ACT\n"); |
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return 0; |
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} |
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server = list_entry(v, struct afs_server, proc_link); |
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alist = rcu_dereference(server->addresses); |
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seq_printf(m, "%pU %3d %3d\n", |
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&server->uuid, |
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atomic_read(&server->ref), |
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atomic_read(&server->active)); |
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seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n", |
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server->flags, server->rtt, server->cb_s_break); |
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seq_printf(m, " - probe: last=%d out=%d\n", |
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(int)(jiffies - server->probed_at) / HZ, |
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atomic_read(&server->probe_outstanding)); |
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seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n", |
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alist->version, alist->responded, alist->failed); |
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for (i = 0; i < alist->nr_addrs; i++) |
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seq_printf(m, " [%x] %pISpc%s\n", |
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i, &alist->addrs[i].transport, |
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alist->preferred == i ? "*" : ""); |
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return 0; |
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} |
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static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos) |
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__acquires(rcu) |
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{ |
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rcu_read_lock(); |
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return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos); |
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} |
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static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos) |
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{ |
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return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos); |
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} |
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static void afs_proc_servers_stop(struct seq_file *m, void *v) |
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__releases(rcu) |
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{ |
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rcu_read_unlock(); |
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} |
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static const struct seq_operations afs_proc_servers_ops = { |
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.start = afs_proc_servers_start, |
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.next = afs_proc_servers_next, |
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.stop = afs_proc_servers_stop, |
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.show = afs_proc_servers_show, |
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}; |
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/* |
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* Display the list of strings that may be substituted for the @sys pathname |
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* macro. |
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*/ |
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static int afs_proc_sysname_show(struct seq_file *m, void *v) |
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{ |
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struct afs_net *net = afs_seq2net(m); |
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struct afs_sysnames *sysnames = net->sysnames; |
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unsigned int i = (unsigned long)v - 1; |
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if (i < sysnames->nr) |
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seq_printf(m, "%s\n", sysnames->subs[i]); |
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return 0; |
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} |
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static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos) |
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__acquires(&net->sysnames_lock) |
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{ |
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struct afs_net *net = afs_seq2net(m); |
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struct afs_sysnames *names; |
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read_lock(&net->sysnames_lock); |
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names = net->sysnames; |
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if (*pos >= names->nr) |
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return NULL; |
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return (void *)(unsigned long)(*pos + 1); |
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} |
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static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos) |
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{ |
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struct afs_net *net = afs_seq2net(m); |
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struct afs_sysnames *names = net->sysnames; |
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*pos += 1; |
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if (*pos >= names->nr) |
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return NULL; |
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return (void *)(unsigned long)(*pos + 1); |
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} |
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static void afs_proc_sysname_stop(struct seq_file *m, void *v) |
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__releases(&net->sysnames_lock) |
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{ |
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struct afs_net *net = afs_seq2net(m); |
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read_unlock(&net->sysnames_lock); |
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} |
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static const struct seq_operations afs_proc_sysname_ops = { |
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.start = afs_proc_sysname_start, |
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.next = afs_proc_sysname_next, |
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.stop = afs_proc_sysname_stop, |
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.show = afs_proc_sysname_show, |
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}; |
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/* |
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* Allow the @sys substitution to be configured. |
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*/ |
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static int afs_proc_sysname_write(struct file *file, char *buf, size_t size) |
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{ |
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struct afs_sysnames *sysnames, *kill; |
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struct seq_file *m = file->private_data; |
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struct afs_net *net = afs_seq2net(m); |
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char *s, *p, *sub; |
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int ret, len; |
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sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL); |
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if (!sysnames) |
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return -ENOMEM; |
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refcount_set(&sysnames->usage, 1); |
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kill = sysnames; |
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p = buf; |
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while ((s = strsep(&p, " \t\n"))) { |
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len = strlen(s); |
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if (len == 0) |
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continue; |
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ret = -ENAMETOOLONG; |
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if (len >= AFSNAMEMAX) |
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goto error; |
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if (len >= 4 && |
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s[len - 4] == '@' && |
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s[len - 3] == 's' && |
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s[len - 2] == 'y' && |
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s[len - 1] == 's') |
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/* Protect against recursion */ |
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goto invalid; |
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if (s[0] == '.' && |
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(len < 2 || (len == 2 && s[1] == '.'))) |
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goto invalid; |
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if (memchr(s, '/', len)) |
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goto invalid; |
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ret = -EFBIG; |
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if (sysnames->nr >= AFS_NR_SYSNAME) |
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goto out; |
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if (strcmp(s, afs_init_sysname) == 0) { |
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sub = (char *)afs_init_sysname; |
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} else { |
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ret = -ENOMEM; |
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sub = kmemdup(s, len + 1, GFP_KERNEL); |
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if (!sub) |
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goto out; |
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} |
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sysnames->subs[sysnames->nr] = sub; |
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sysnames->nr++; |
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} |
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|
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if (sysnames->nr == 0) { |
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sysnames->subs[0] = sysnames->blank; |
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sysnames->nr++; |
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} |
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|
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write_lock(&net->sysnames_lock); |
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kill = net->sysnames; |
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net->sysnames = sysnames; |
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write_unlock(&net->sysnames_lock); |
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ret = 0; |
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out: |
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afs_put_sysnames(kill); |
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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]); |
|
kfree(sysnames); |
|
} |
|
} |
|
|
|
/* |
|
* 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 afs_vl_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; |
|
}
|
|
|