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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 46/76] fscache: Display cache-specific data in /proc/fs/fscache/objects From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: dhowells@redhat.com, Jeff Layton , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, 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: Fri, 20 Nov 2020 15:12:30 +0000 Message-ID: <160588515066.3465195.12004947297887352847.stgit@warthog.procyon.org.uk> In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> References: <160588455242.3465195.3214733858273019178.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-fsdevel@vger.kernel.org Allow the cache to add information in /proc/fs/fscache/objects instead of displaying cookie key and aux data - which can be seen in the cookies file. Signed-off-by: David Howells --- fs/cachefiles/content-map.c | 41 +++++++++++++++++++++++++++++++++++++++++ fs/cachefiles/interface.c | 1 + fs/cachefiles/internal.h | 1 + fs/fscache/object-list.c | 33 +++------------------------------ include/linux/fscache-cache.h | 4 ++++ 5 files changed, 50 insertions(+), 30 deletions(-) diff --git a/fs/cachefiles/content-map.c b/fs/cachefiles/content-map.c index 4ff8c645817c..4c8dc11d2d4c 100644 --- a/fs/cachefiles/content-map.c +++ b/fs/cachefiles/content-map.c @@ -408,3 +408,44 @@ void cachefiles_save_content_map(struct cachefiles_object *object) _leave(" = %zd", ret); } + +/* + * Display object information in proc. + */ +int cachefiles_display_object(struct seq_file *m, struct fscache_object *_object) +{ + struct cachefiles_object *object = + container_of(_object, struct cachefiles_object, fscache); + + if (object->fscache.cookie->type == FSCACHE_COOKIE_TYPE_INDEX) { + if (object->content_info != CACHEFILES_CONTENT_NO_DATA) + seq_printf(m, " ???%u???", object->content_info); + } else { + switch (object->content_info) { + case CACHEFILES_CONTENT_NO_DATA: + seq_puts(m, " "); + break; + case CACHEFILES_CONTENT_SINGLE: + seq_puts(m, " "); + break; + case CACHEFILES_CONTENT_ALL: + seq_puts(m, " "); + break; + case CACHEFILES_CONTENT_MAP: + read_lock_bh(&object->content_map_lock); + if (object->content_map) { + seq_printf(m, " %*phN", + object->content_map_size, + object->content_map); + } + read_unlock_bh(&object->content_map_lock); + break; + default: + seq_printf(m, " <%u>", object->content_info); + break; + } + } + + seq_putc(m, '\n'); + return 0; +} diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c index 654c6efb5a0a..c083d9833b87 100644 --- a/fs/cachefiles/interface.c +++ b/fs/cachefiles/interface.c @@ -502,4 +502,5 @@ const struct fscache_cache_ops cachefiles_cache_ops = { .get_object_usage = cachefiles_get_object_usage, .sync_cache = cachefiles_sync_cache, .begin_operation = cachefiles_begin_operation, + .display_object = cachefiles_display_object, }; diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 24a8aed2600d..b58177f65135 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -135,6 +135,7 @@ extern void cachefiles_expand_content_map(struct cachefiles_object *object, loff extern void cachefiles_shorten_content_map(struct cachefiles_object *object, loff_t new_size); extern bool cachefiles_load_content_map(struct cachefiles_object *object); extern void cachefiles_save_content_map(struct cachefiles_object *object); +extern int cachefiles_display_object(struct seq_file *m, struct fscache_object *object); /* * daemon.c diff --git a/fs/fscache/object-list.c b/fs/fscache/object-list.c index 5777f909d31a..361610e124bd 100644 --- a/fs/fscache/object-list.c +++ b/fs/fscache/object-list.c @@ -155,7 +155,6 @@ static int fscache_objlist_show(struct seq_file *m, void *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 USE CHLDN OPS FL S" @@ -201,8 +200,6 @@ static int fscache_objlist_show(struct seq_file *m, void *v) obj->stage); if (obj->cookie) { - uint16_t keylen = 0, auxlen = 0; - switch (cookie->type) { case 0: type = "IX"; @@ -211,8 +208,7 @@ static int fscache_objlist_show(struct seq_file *m, void *v) type = "DT"; break; default: - snprintf(_type, sizeof(_type), "%02u", - cookie->type); + snprintf(_type, sizeof(_type), "%02x", cookie->type); type = _type; break; } @@ -223,34 +219,11 @@ static int fscache_objlist_show(struct seq_file *m, void *v) type, cookie->stage, cookie->flags); - - 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; + + return obj->cache->ops->display_object(m, obj); } static const struct seq_operations fscache_objlist_ops = { diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index 97415d19aa82..54625464a109 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -19,6 +19,7 @@ #define NR_MAXCACHES BITS_PER_LONG +struct seq_file; struct fscache_cache; struct fscache_cache_ops; struct fscache_object; @@ -139,6 +140,9 @@ struct fscache_cache_ops { /* Begin an operation on a cache object */ void (*begin_operation)(struct fscache_op_resources *opr); + + /* Display object info in /proc/fs/fscache/objects */ + int (*display_object)(struct seq_file *m, struct fscache_object *object); }; extern struct fscache_cookie fscache_fsdef_index;