/* proc.c: /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/sched.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include "cell.h" #include "volume.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 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 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, }; 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 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 }; 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 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 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, }; 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 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 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, }; 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 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 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, }; /*****************************************************************************/ /* * 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; proc_afs->owner = THIS_MODULE; p = create_proc_entry("cells", 0, proc_afs); if (!p) goto error_proc; p->proc_fops = &afs_proc_cells_fops; p->owner = THIS_MODULE; p = create_proc_entry("rootcell", 0, proc_afs); if (!p) goto error_cells; p->proc_fops = &afs_proc_rootcell_fops; p->owner = THIS_MODULE; _leave(" = 0"); return 0; error_cells: remove_proc_entry("cells", proc_afs); error_proc: remove_proc_entry("fs/afs", NULL); error: _leave(" = -ENOMEM"); return -ENOMEM; } /* end afs_proc_init() */ /*****************************************************************************/ /* * clean up the /proc/fs/afs/ directory */ void afs_proc_cleanup(void) { remove_proc_entry("cells", proc_afs); remove_proc_entry("fs/afs", NULL); } /* end afs_proc_cleanup() */ /*****************************************************************************/ /* * 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; } /* end afs_proc_cells_open() */ /*****************************************************************************/ /* * 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) { struct list_head *_p; loff_t pos = *_pos; /* lock the list against modification */ down_read(&afs_proc_cells_sem); /* allow for the header line */ if (!pos) return (void *) 1; pos--; /* find the n'th element in the list */ list_for_each(_p, &afs_proc_cells) if (!pos--) break; return _p != &afs_proc_cells ? _p : NULL; } /* end afs_proc_cells_start() */ /*****************************************************************************/ /* * move to next cell in cells list */ static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos) { struct list_head *_p; (*pos)++; _p = v; _p = v == (void *) 1 ? afs_proc_cells.next : _p->next; return _p != &afs_proc_cells ? _p : NULL; } /* end afs_proc_cells_next() */ /*****************************************************************************/ /* * 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); } /* end afs_proc_cells_stop() */ /*****************************************************************************/ /* * 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); /* display header on line 1 */ if (v == (void *) 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; } /* end afs_proc_cells_show() */ /*****************************************************************************/ /* * 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; ret = afs_cell_create(name, args, &cell); if (ret < 0) goto done; 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; } /* end afs_proc_cells_write() */ /*****************************************************************************/ /* * 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; } /* end afs_proc_rootcell_write() */ /*****************************************************************************/ /* * 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) return -ENOMEM; p = create_proc_entry("servers", 0, cell->proc_dir); if (!p) goto error_proc; p->proc_fops = &afs_proc_cell_servers_fops; p->owner = THIS_MODULE; p->data = cell; p = create_proc_entry("vlservers", 0, cell->proc_dir); if (!p) goto error_servers; p->proc_fops = &afs_proc_cell_vlservers_fops; p->owner = THIS_MODULE; p->data = cell; p = create_proc_entry("volumes", 0, cell->proc_dir); if (!p) goto error_vlservers; p->proc_fops = &afs_proc_cell_volumes_fops; p->owner = THIS_MODULE; p->data = cell; _leave(" = 0"); return 0; error_vlservers: remove_proc_entry("vlservers", cell->proc_dir); error_servers: remove_proc_entry("servers", cell->proc_dir); error_proc: remove_proc_entry(cell->name, proc_afs); _leave(" = -ENOMEM"); return -ENOMEM; } /* end afs_proc_cell_setup() */ /*****************************************************************************/ /* * 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(""); } /* end afs_proc_cell_remove() */ /*****************************************************************************/ /* * 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 = afs_get_cell_maybe((struct afs_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; } /* end afs_proc_cell_volumes_open() */ /*****************************************************************************/ /* * close the file and release the ref to the cell */ static int afs_proc_cell_volumes_release(struct inode *inode, struct file *file) { struct afs_cell *cell = PDE(inode)->data; int ret; ret = seq_release(inode,file); afs_put_cell(cell); return ret; } /* end afs_proc_cell_volumes_release() */ /*****************************************************************************/ /* * 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 list_head *_p; 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--; /* find the n'th element in the list */ list_for_each(_p, &cell->vl_list) if (!pos--) break; return _p != &cell->vl_list ? _p : NULL; } /* end afs_proc_cell_volumes_start() */ /*****************************************************************************/ /* * move to next cell in cells list */ static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v, loff_t *_pos) { struct list_head *_p; struct afs_cell *cell = p->private; _enter("cell=%p pos=%Ld", cell, *_pos); (*_pos)++; _p = v; _p = v == (void *) 1 ? cell->vl_list.next : _p->next; return _p != &cell->vl_list ? _p : NULL; } /* end afs_proc_cell_volumes_next() */ /*****************************************************************************/ /* * 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); } /* end afs_proc_cell_volumes_stop() */ /*****************************************************************************/ /* * 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_vlocation *vlocation = list_entry(v, struct afs_vlocation, link); /* display header on line 1 */ if (v == (void *) 1) { seq_puts(m, "USE VLID[0] VLID[1] VLID[2] NAME\n"); return 0; } /* display one cell per line on subsequent lines */ seq_printf(m, "%3d %08x %08x %08x %s\n", atomic_read(&vlocation->usage), vlocation->vldb.vid[0], vlocation->vldb.vid[1], vlocation->vldb.vid[2], vlocation->vldb.name ); return 0; } /* end afs_proc_cell_volumes_show() */ /*****************************************************************************/ /* * 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 = afs_get_cell_maybe((struct afs_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; } /* end afs_proc_cell_vlservers_open() */ /*****************************************************************************/ /* * close the file and release the ref to the cell */ static int afs_proc_cell_vlservers_release(struct inode *inode, struct file *file) { struct afs_cell *cell = PDE(inode)->data; int ret; ret = seq_release(inode,file); afs_put_cell(cell); return ret; } /* end afs_proc_cell_vlservers_release() */ /*****************************************************************************/ /* * 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]; } /* end afs_proc_cell_vlservers_start() */ /*****************************************************************************/ /* * 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]; } /* end afs_proc_cell_vlservers_next() */ /*****************************************************************************/ /* * 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); } /* end afs_proc_cell_vlservers_stop() */ /*****************************************************************************/ /* * 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, "%u.%u.%u.%u\n", NIPQUAD(addr->s_addr)); return 0; } /* end afs_proc_cell_vlservers_show() */ /*****************************************************************************/ /* * 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 = afs_get_cell_maybe((struct afs_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; } /* end afs_proc_cell_servers_open() */ /*****************************************************************************/ /* * close the file and release the ref to the cell */ static int afs_proc_cell_servers_release(struct inode *inode, struct file *file) { struct afs_cell *cell = PDE(inode)->data; int ret; ret = seq_release(inode, file); afs_put_cell(cell); return ret; } /* end afs_proc_cell_servers_release() */ /*****************************************************************************/ /* * 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) { struct list_head *_p; struct afs_cell *cell = m->private; loff_t pos = *_pos; _enter("cell=%p pos=%Ld", cell, *_pos); /* lock the list against modification */ read_lock(&cell->sv_lock); /* allow for the header line */ if (!pos) return (void *) 1; pos--; /* find the n'th element in the list */ list_for_each(_p, &cell->sv_list) if (!pos--) break; return _p != &cell->sv_list ? _p : NULL; } /* end afs_proc_cell_servers_start() */ /*****************************************************************************/ /* * move to next cell in cells list */ static void *afs_proc_cell_servers_next(struct seq_file *p, void *v, loff_t *_pos) { struct list_head *_p; struct afs_cell *cell = p->private; _enter("cell=%p pos=%Ld", cell, *_pos); (*_pos)++; _p = v; _p = v == (void *) 1 ? cell->sv_list.next : _p->next; return _p != &cell->sv_list ? _p : NULL; } /* end afs_proc_cell_servers_next() */ /*****************************************************************************/ /* * clean up after reading from the cells list */ static void afs_proc_cell_servers_stop(struct seq_file *p, void *v) { struct afs_cell *cell = p->private; read_unlock(&cell->sv_lock); } /* end afs_proc_cell_servers_stop() */ /*****************************************************************************/ /* * 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_server *server = list_entry(v, struct afs_server, link); char ipaddr[20]; /* display header on line 1 */ if (v == (void *) 1) { seq_puts(m, "USE ADDR STATE\n"); return 0; } /* display one cell per line on subsequent lines */ sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(server->addr)); seq_printf(m, "%3d %-15.15s %5d\n", atomic_read(&server->usage), ipaddr, server->fs_state ); return 0; } /* end afs_proc_cell_servers_show() */