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linux
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fscache
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object-list.c
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object-list.c
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/* Global fscache object list maintainer and viewer * * Copyright (C) 2009 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 Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #define FSCACHE_DEBUG_LEVEL COOKIE #include <linux/module.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/key.h> #include <keys/user-type.h> #include "internal.h" static struct rb_root fscache_object_list; static DEFINE_RWLOCK(fscache_object_list_lock); struct fscache_objlist_data { unsigned long config; /* display configuration */ #define FSCACHE_OBJLIST_CONFIG_KEY 0x00000001 /* show object keys */ #define FSCACHE_OBJLIST_CONFIG_AUX 0x00000002 /* show object auxdata */ #define FSCACHE_OBJLIST_CONFIG_COOKIE 0x00000004 /* show objects with cookies */ #define FSCACHE_OBJLIST_CONFIG_NOCOOKIE 0x00000008 /* show objects without cookies */ #define FSCACHE_OBJLIST_CONFIG_BUSY 0x00000010 /* show busy objects */ #define FSCACHE_OBJLIST_CONFIG_IDLE 0x00000020 /* show idle objects */ #define FSCACHE_OBJLIST_CONFIG_PENDWR 0x00000040 /* show objects with pending writes */ #define FSCACHE_OBJLIST_CONFIG_NOPENDWR 0x00000080 /* show objects without pending writes */ #define FSCACHE_OBJLIST_CONFIG_READS 0x00000100 /* show objects with active reads */ #define FSCACHE_OBJLIST_CONFIG_NOREADS 0x00000200 /* show objects without active reads */ #define FSCACHE_OBJLIST_CONFIG_EVENTS 0x00000400 /* show objects with events */ #define FSCACHE_OBJLIST_CONFIG_NOEVENTS 0x00000800 /* show objects without no events */ #define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with work */ #define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without work */ u8 buf[512]; /* key and aux data buffer */ }; /* * Add an object to the object list * - we use the address of the fscache_object structure as the key into the * tree */ void fscache_objlist_add(struct fscache_object *obj) { struct fscache_object *xobj; struct rb_node **p = &fscache_object_list.rb_node, *parent = NULL; ASSERT(RB_EMPTY_NODE(&obj->objlist_link)); write_lock(&fscache_object_list_lock); while (*p) { parent = *p; xobj = rb_entry(parent, struct fscache_object, objlist_link); if (obj < xobj) p = &(*p)->rb_left; else if (obj > xobj) p = &(*p)->rb_right; else BUG(); } rb_link_node(&obj->objlist_link, parent, p); rb_insert_color(&obj->objlist_link, &fscache_object_list); write_unlock(&fscache_object_list_lock); } /* * Remove an object from the object list. */ void fscache_objlist_remove(struct fscache_object *obj) { if (RB_EMPTY_NODE(&obj->objlist_link)) return; write_lock(&fscache_object_list_lock); BUG_ON(RB_EMPTY_ROOT(&fscache_object_list)); rb_erase(&obj->objlist_link, &fscache_object_list); write_unlock(&fscache_object_list_lock); } /* * find the object in the tree on or after the specified index */ static struct fscache_object *fscache_objlist_lookup(loff_t *_pos) { struct fscache_object *pobj, *obj = NULL, *minobj = NULL; struct rb_node *p; unsigned long pos; if (*_pos >= (unsigned long) ERR_PTR(-ENOENT)) return NULL; pos = *_pos; /* banners (can't represent line 0 by pos 0 as that would involve * returning a NULL pointer) */ if (pos == 0) return (struct fscache_object *)(long)++(*_pos); if (pos < 3) return (struct fscache_object *)pos; pobj = (struct fscache_object *)pos; p = fscache_object_list.rb_node; while (p) { obj = rb_entry(p, struct fscache_object, objlist_link); if (pobj < obj) { if (!minobj || minobj > obj) minobj = obj; p = p->rb_left; } else if (pobj > obj) { p = p->rb_right; } else { minobj = obj; break; } obj = NULL; } if (!minobj) *_pos = (unsigned long) ERR_PTR(-ENOENT); else if (minobj != obj) *_pos = (unsigned long) minobj; return minobj; } /* * set up the iterator to start reading from the first line */ static void *fscache_objlist_start(struct seq_file *m, loff_t *_pos) __acquires(&fscache_object_list_lock) { read_lock(&fscache_object_list_lock); return fscache_objlist_lookup(_pos); } /* * move to the next line */ static void *fscache_objlist_next(struct seq_file *m, void *v, loff_t *_pos) { (*_pos)++; return fscache_objlist_lookup(_pos); } /* * clean up after reading */ static void fscache_objlist_stop(struct seq_file *m, void *v) __releases(&fscache_object_list_lock) { read_unlock(&fscache_object_list_lock); } /* * display an object */ static int fscache_objlist_show(struct seq_file *m, void *v) { struct fscache_objlist_data *data = m->private; struct fscache_object *obj = v; struct fscache_cookie *cookie; unsigned long config = data->config; char _type[3], *type; u8 *buf = data->buf, *p; if ((unsigned long) v == 1) { seq_puts(m, "OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS" " EM EV FL S" " | NETFS_COOKIE_DEF TY FL NETFS_DATA"); if (config & (FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX)) seq_puts(m, " "); if (config & FSCACHE_OBJLIST_CONFIG_KEY) seq_puts(m, "OBJECT_KEY"); if ((config & (FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX)) == (FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX)) seq_puts(m, ", "); if (config & FSCACHE_OBJLIST_CONFIG_AUX) seq_puts(m, "AUX_DATA"); seq_puts(m, "\n"); return 0; } if ((unsigned long) v == 2) { seq_puts(m, "======== ======== ==== ===== === === === == =====" " == == == =" " | ================ == == ================"); if (config & (FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX)) seq_puts(m, " ================"); seq_puts(m, "\n"); return 0; } /* filter out any unwanted objects */ #define FILTER(criterion, _yes, _no) \ do { \ unsigned long yes = FSCACHE_OBJLIST_CONFIG_##_yes; \ unsigned long no = FSCACHE_OBJLIST_CONFIG_##_no; \ if (criterion) { \ if (!(config & yes)) \ return 0; \ } else { \ if (!(config & no)) \ return 0; \ } \ } while(0) cookie = obj->cookie; if (~config) { FILTER(cookie->def, COOKIE, NOCOOKIE); FILTER(fscache_object_is_active(obj) || obj->n_ops != 0 || obj->n_obj_ops != 0 || obj->flags || !list_empty(&obj->dependents), BUSY, IDLE); FILTER(test_bit(FSCACHE_OBJECT_PENDING_WRITE, &obj->flags), PENDWR, NOPENDWR); FILTER(atomic_read(&obj->n_reads), READS, NOREADS); FILTER(obj->events & obj->event_mask, EVENTS, NOEVENTS); FILTER(work_busy(&obj->work), WORK, NOWORK); } seq_printf(m, "%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %2lx %1x | ", obj->debug_id, obj->parent ? obj->parent->debug_id : -1, obj->state->short_name, obj->n_children, obj->n_ops, obj->n_obj_ops, obj->n_in_progress, obj->n_exclusive, atomic_read(&obj->n_reads), obj->event_mask, obj->events, obj->flags, work_busy(&obj->work)); if (fscache_use_cookie(obj)) { uint16_t keylen = 0, auxlen = 0; switch (cookie->def->type) { case 0: type = "IX"; break; case 1: type = "DT"; break; default: sprintf(_type, "%02u", cookie->def->type); type = _type; break; } seq_printf(m, "%-16s %s %2lx %16p", cookie->def->name, type, cookie->flags, cookie->netfs_data); if (cookie->def->get_key && config & FSCACHE_OBJLIST_CONFIG_KEY) keylen = cookie->def->get_key(cookie->netfs_data, buf, 400); if (cookie->def->get_aux && config & FSCACHE_OBJLIST_CONFIG_AUX) auxlen = cookie->def->get_aux(cookie->netfs_data, buf + keylen, 512 - keylen); fscache_unuse_cookie(obj); if (keylen > 0 || auxlen > 0) { seq_puts(m, " "); for (p = buf; keylen > 0; keylen--) seq_printf(m, "%02x", *p++); if (auxlen > 0) { if (config & FSCACHE_OBJLIST_CONFIG_KEY) seq_puts(m, ", "); for (; auxlen > 0; auxlen--) seq_printf(m, "%02x", *p++); } } seq_puts(m, "\n"); } else { seq_puts(m, "<no_netfs>\n"); } return 0; } static const struct seq_operations fscache_objlist_ops = { .start = fscache_objlist_start, .stop = fscache_objlist_stop, .next = fscache_objlist_next, .show = fscache_objlist_show, }; /* * get the configuration for filtering the list */ static void fscache_objlist_config(struct fscache_objlist_data *data) { #ifdef CONFIG_KEYS const struct user_key_payload *confkey; unsigned long config; struct key *key; const char *buf; int len; key = request_key(&key_type_user, "fscache:objlist", NULL); if (IS_ERR(key)) goto no_config; config = 0; rcu_read_lock(); confkey = user_key_payload(key); if (!confkey) { /* key was revoked */ rcu_read_unlock(); key_put(key); goto no_config; } buf = confkey->data; for (len = confkey->datalen - 1; len >= 0; len--) { switch (buf[len]) { case 'K': config |= FSCACHE_OBJLIST_CONFIG_KEY; break; case 'A': config |= FSCACHE_OBJLIST_CONFIG_AUX; break; case 'C': config |= FSCACHE_OBJLIST_CONFIG_COOKIE; break; case 'c': config |= FSCACHE_OBJLIST_CONFIG_NOCOOKIE; break; case 'B': config |= FSCACHE_OBJLIST_CONFIG_BUSY; break; case 'b': config |= FSCACHE_OBJLIST_CONFIG_IDLE; break; case 'W': config |= FSCACHE_OBJLIST_CONFIG_PENDWR; break; case 'w': config |= FSCACHE_OBJLIST_CONFIG_NOPENDWR; break; case 'R': config |= FSCACHE_OBJLIST_CONFIG_READS; break; case 'r': config |= FSCACHE_OBJLIST_CONFIG_NOREADS; break; case 'S': config |= FSCACHE_OBJLIST_CONFIG_WORK; break; case 's': config |= FSCACHE_OBJLIST_CONFIG_NOWORK; break; } } rcu_read_unlock(); key_put(key); if (!(config & (FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE))) config |= FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE; if (!(config & (FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE))) config |= FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE; if (!(config & (FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR))) config |= FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR; if (!(config & (FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS))) config |= FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS; if (!(config & (FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS))) config |= FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS; if (!(config & (FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK))) config |= FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK; data->config = config; return; no_config: #endif data->config = ULONG_MAX; } /* * open "/proc/fs/fscache/objects" to provide a list of active objects * - can be configured by a user-defined key added to the caller's keyrings */ static int fscache_objlist_open(struct inode *inode, struct file *file) { struct fscache_objlist_data *data; data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data)); if (!data) return -ENOMEM; /* get the configuration key */ fscache_objlist_config(data); return 0; } /* * clean up on close */ static int fscache_objlist_release(struct inode *inode, struct file *file) { struct seq_file *m = file->private_data; kfree(m->private); m->private = NULL; return seq_release(inode, file); } const struct file_operations fscache_objlist_fops = { .open = fscache_objlist_open, .read = seq_read, .llseek = seq_lseek, .release = fscache_objlist_release, };
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