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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 07/12] fscache: Remove the object list procfile From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , David Wysochanski , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 21 Jun 2021 22:46:23 +0100 Message-ID: <162431198332.2908479.5847286163455099669.stgit@warthog.procyon.org.uk> In-Reply-To: <162431188431.2908479.14031376932042135080.stgit@warthog.procyon.org.uk> References: <162431188431.2908479.14031376932042135080.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Remove the object list procfile from fscache as objects will become entirely internal to the cache. Signed-off-by: David Howells --- fs/fscache/Kconfig | 7 - fs/fscache/Makefile | 1 fs/fscache/cache.c | 1 fs/fscache/cookie.c | 2 fs/fscache/internal.h | 13 - fs/fscache/object-list.c | 414 ----------------------------------------- fs/fscache/object.c | 2 include/linux/fscache-cache.h | 3 8 files changed, 443 deletions(-) delete mode 100644 fs/fscache/object-list.c diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig index 5e3a5b3f950d..b313a978ae0a 100644 --- a/fs/fscache/Kconfig +++ b/fs/fscache/Kconfig @@ -38,10 +38,3 @@ config FSCACHE_DEBUG enabled by setting bits in /sys/modules/fscache/parameter/debug. See Documentation/filesystems/caching/fscache.rst for more information. - -config FSCACHE_OBJECT_LIST - bool "Maintain global object list for debugging purposes" - depends on FSCACHE && PROC_FS - help - Maintain a global list of active fscache objects that can be - retrieved through /proc/fs/fscache/objects for debugging purposes diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile index 45d5235a449b..03a871d689bb 100644 --- a/fs/fscache/Makefile +++ b/fs/fscache/Makefile @@ -16,6 +16,5 @@ fscache-y := \ fscache-$(CONFIG_PROC_FS) += proc.o fscache-$(CONFIG_FSCACHE_STATS) += stats.o -fscache-$(CONFIG_FSCACHE_OBJECT_LIST) += object-list.o obj-$(CONFIG_FSCACHE) := fscache.o diff --git a/fs/fscache/cache.c b/fs/fscache/cache.c index fcc136361415..8a6ffcac867f 100644 --- a/fs/fscache/cache.c +++ b/fs/fscache/cache.c @@ -261,7 +261,6 @@ int fscache_add_cache(struct fscache_cache *cache, spin_lock(&cache->object_list_lock); list_add_tail(&ifsdef->cache_link, &cache->object_list); spin_unlock(&cache->object_list_lock); - fscache_objlist_add(ifsdef); /* add the cache's netfs definition index object to the top level index * cookie as a known backing object */ diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index c7047544972b..2f4d5271ad2e 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -620,8 +620,6 @@ static int fscache_attach_object(struct fscache_cookie *cookie, /* Attach to the cookie. The object already has a ref on it. */ hlist_add_head(&object->cookie_link, &cookie->backing_objects); - - fscache_objlist_add(object); ret = 0; cant_attach_object: diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h index 796678b2b32a..200082cafdda 100644 --- a/fs/fscache/internal.h +++ b/fs/fscache/internal.h @@ -84,19 +84,6 @@ static inline bool fscache_object_congested(void) */ extern void fscache_enqueue_object(struct fscache_object *); -/* - * object-list.c - */ -#ifdef CONFIG_FSCACHE_OBJECT_LIST -extern const struct proc_ops fscache_objlist_proc_ops; - -extern void fscache_objlist_add(struct fscache_object *); -extern void fscache_objlist_remove(struct fscache_object *); -#else -#define fscache_objlist_add(object) do {} while(0) -#define fscache_objlist_remove(object) do {} while(0) -#endif - /* * operation.c */ diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c deleted file mode 100644 index 1a0dc32c0a33..000000000000 --- a/fs/fscache/object-list.c +++ /dev/null @@ -1,414 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* Global fscache object list maintainer and viewer - * - * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - */ - -#define FSCACHE_DEBUG_LEVEL COOKIE -#include -#include -#include -#include -#include -#include -#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 */ -}; - -/* - * 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 *p; - - if ((unsigned long) v == 1) { - seq_puts(m, "OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS" - " EM EV FL S" - " | COOKIE 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, - "%08x %08x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %2lx %1x | ", - obj->debug_id, - obj->parent ? obj->parent->debug_id : UINT_MAX, - 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 (obj->cookie) { - uint16_t keylen = 0, auxlen = 0; - - switch (cookie->type) { - case 0: - type = "IX"; - break; - case 1: - type = "DT"; - break; - default: - snprintf(_type, sizeof(_type), "%02u", - cookie->type); - type = _type; - break; - } - - seq_printf(m, "%08x %-16s %s %3lx %16p", - cookie->debug_id, - cookie->def->name, - type, - cookie->flags, - cookie->netfs_data); - - if (config & FSCACHE_OBJLIST_CONFIG_KEY) - keylen = cookie->key_len; - - if (config & FSCACHE_OBJLIST_CONFIG_AUX) - auxlen = cookie->aux_len; - - if (keylen > 0 || auxlen > 0) { - seq_puts(m, " "); - p = keylen <= sizeof(cookie->inline_key) ? - cookie->inline_key : cookie->key; - for (; keylen > 0; keylen--) - seq_printf(m, "%02x", *p++); - if (auxlen > 0) { - if (config & FSCACHE_OBJLIST_CONFIG_KEY) - seq_puts(m, ", "); - p = auxlen <= sizeof(cookie->inline_aux) ? - cookie->inline_aux : cookie->aux; - for (; auxlen > 0; auxlen--) - seq_printf(m, "%02x", *p++); - } - } - - seq_puts(m, "\n"); - } else { - seq_puts(m, "\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_rcu(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 proc_ops fscache_objlist_proc_ops = { - .proc_open = fscache_objlist_open, - .proc_read = seq_read, - .proc_lseek = seq_lseek, - .proc_release = fscache_objlist_release, -}; diff --git a/fs/fscache/object.c b/fs/fscache/object.c index 5dbaab2e1262..b3853274733f 100644 --- a/fs/fscache/object.c +++ b/fs/fscache/object.c @@ -794,8 +794,6 @@ static void fscache_put_object(struct fscache_object *object, */ void fscache_object_destroy(struct fscache_object *object) { - fscache_objlist_remove(object); - /* We can get rid of the cookie now */ fscache_cookie_put(object->cookie, fscache_cookie_put_object); object->cookie = NULL; diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index fbff0b7e3ef1..8d39491c5f9f 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -384,9 +384,6 @@ struct fscache_object { struct list_head dependents; /* FIFO of dependent objects */ struct list_head dep_link; /* link in parent's dependents list */ struct list_head pending_ops; /* unstarted operations on this object */ -#ifdef CONFIG_FSCACHE_OBJECT_LIST - struct rb_node objlist_link; /* link in global object list */ -#endif pgoff_t store_limit; /* current storage limit */ loff_t store_limit_l; /* current storage limit */ };