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From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>
Cc: dhowells@redhat.com, Jeff Layton <jlayton@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	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
Subject: [RFC PATCH 46/76] fscache: Display cache-specific data in /proc/fs/fscache/objects
Date: Fri, 20 Nov 2020 15:12:30 +0000
Message-ID: <160588515066.3465195.12004947297887352847.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk>

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 <dhowells@redhat.com>
---

 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, " <n>");
+			break;
+		case CACHEFILES_CONTENT_SINGLE:
+			seq_puts(m, " <s>");
+			break;
+		case CACHEFILES_CONTENT_ALL:
+			seq_puts(m, " <a>");
+			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, "<no_netfs>\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;



  parent reply index

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20 15:02 [RFC PATCH 00/76] fscache: Modernisation David Howells
2020-11-20 15:02 ` [RFC PATCH 01/76] nfs, cifs, ceph, 9p: Disable use of fscache prior to its rewrite David Howells
2020-11-20 15:02 ` [RFC PATCH 02/76] afs: Disable use of the fscache I/O routines David Howells
2020-11-20 15:03 ` [RFC PATCH 03/76] fscache: Add a cookie debug ID and use that in traces David Howells
2020-11-20 15:03 ` [RFC PATCH 04/76] fscache: Procfile to display cookies David Howells
2020-11-20 15:03 ` [RFC PATCH 05/76] fscache: Remove the old I/O API David Howells
2020-11-20 15:03 ` [RFC PATCH 06/76] fscache: Remove the netfs data from the cookie David Howells
2020-11-20 15:04 ` [RFC PATCH 07/76] fscache: Remove struct fscache_cookie_def David Howells
2020-11-20 15:04 ` [RFC PATCH 08/76] fscache: Remove store_limit* from struct fscache_object David Howells
2020-11-20 15:04 ` [RFC PATCH 09/76] fscache: Remove fscache_check_consistency() David Howells
2020-11-20 15:04 ` [RFC PATCH 10/76] fscache: Remove fscache_attr_changed() David Howells
2020-11-20 15:04 ` [RFC PATCH 11/76] fscache: Remove obsolete stats David Howells
2020-11-20 15:05 ` [RFC PATCH 12/76] fscache: Remove old I/O tracepoints David Howells
2020-11-20 15:05 ` [RFC PATCH 13/76] fscache: Temporarily disable fscache_invalidate() David Howells
2020-11-20 15:05 ` [RFC PATCH 14/76] fscache: Remove the I/O operation manager David Howells
2020-11-20 15:05 ` [RFC PATCH 15/76] fscache: Change %p in format strings to something else David Howells
2020-11-20 15:06 ` [RFC PATCH 16/76] cachefiles: " David Howells
2020-11-20 15:06 ` [RFC PATCH 17/76] iov_iter: Add ITER_XARRAY David Howells
2020-11-20 15:06 ` [RFC PATCH 18/76] vm: Add wait/unlock functions for PG_fscache David Howells
2020-11-20 15:06 ` [RFC PATCH 19/76] mm: Implement readahead_control pageset expansion David Howells
2020-11-20 15:06 ` [RFC PATCH 20/76] mm: Stop generic_file_buffered_read() from grabbing a superfluous page David Howells
2020-11-20 15:07 ` [RFC PATCH 21/76] vfs: Export rw_verify_area() for use by cachefiles David Howells
2020-11-20 15:07 ` [RFC PATCH 22/76] vfs: Provide S_CACHE_FILE inode flag David Howells
2020-11-20 15:07 ` [RFC PATCH 23/76] cachefiles: Remove tree of active files and use " David Howells
2020-11-20 15:07 ` [RFC PATCH 24/76] fscache: Provide a simple thread pool for running ops asynchronously David Howells
2020-11-20 15:08 ` [RFC PATCH 26/76] fscache: Rewrite the I/O API based on iov_iter David Howells
2020-11-20 15:08 ` [RFC PATCH 27/76] fscache: Keep track of size of a file last set independently on the server David Howells
2020-11-20 15:08 ` [RFC PATCH 28/76] fscache, cachefiles: Fix disabled histogram warnings David Howells
2020-11-20 15:08 ` [RFC PATCH 29/76] fscache: Recast assertion in terms of cookie not being an index David Howells
2020-11-20 15:08 ` [RFC PATCH 30/76] vfs, fscache: Force ->write_inode() to occur if cookie pinned for writeback David Howells
2020-11-20 15:09 ` [RFC PATCH 31/76] fscache: Allow ->put_super() to be used to wait for cache operations David Howells
2020-11-20 15:09 ` [RFC PATCH 32/76] netfs: Make a netfs helper module David Howells
2020-11-20 15:09 ` [RFC PATCH 33/76] netfs: Provide readahead and readpage netfs helpers David Howells
2020-11-20 15:09 ` [RFC PATCH 34/76] netfs: Use the cache David Howells
2020-11-20 15:10 ` [RFC PATCH 35/76] fscache: read-helper: Add tracepoints David Howells
2020-11-20 15:10 ` [RFC PATCH 36/76] cachefiles: Remove some redundant checks on unsigned values David Howells
2020-11-20 15:10 ` [RFC PATCH 37/76] cachefiles: trace: Log coherency checks David Howells
2020-11-20 15:10 ` [RFC PATCH 38/76] cachefiles: Split cachefiles_drop_object() up a bit David Howells
2020-11-20 15:11 ` [RFC PATCH 39/76] cachefiles: Implement new fscache I/O backend API David Howells
2020-11-20 15:11 ` [RFC PATCH 40/76] cachefiles: Merge object->backer into object->dentry David Howells
2020-11-20 15:11 ` [RFC PATCH 41/76] cachefiles: Implement a content-present indicator and bitmap David Howells
2020-11-20 15:11 ` [RFC PATCH 42/76] cachefiles: Shape requests from the fscache read helper David Howells
2020-11-20 15:11 ` [RFC PATCH 43/76] cachefiles: Round the cachefile size up to DIO block size David Howells
2020-11-20 15:12 ` [RFC PATCH 44/76] cachefiles: Implement read and write parts of new I/O API David Howells
2020-11-20 15:12 ` [RFC PATCH 45/76] cachefiles: Add I/O tracepoints David Howells
2020-11-20 15:12 ` David Howells [this message]
2020-11-20 15:12 ` [RFC PATCH 47/76] fscache: Remove more obsolete stats David Howells
2020-11-20 15:12 ` [RFC PATCH 48/76] fscache: Always create /proc/fs/fscache/stats if configured David Howells
2020-11-20 15:13 ` [RFC PATCH 49/76] netfs: Stats David Howells
2020-11-20 15:13 ` [RFC PATCH 50/76] fscache: New stats David Howells
2020-11-20 15:13 ` [RFC PATCH 51/76] fscache, cachefiles: Rewrite invalidation David Howells
2020-11-20 15:13 ` [RFC PATCH 52/76] fscache: disable cookie when doing an invalidation for DIO write David Howells
2020-11-20 15:13 ` [RFC PATCH 53/76] fscache: Implement "will_modify" parameter on fscache_use_cookie() David Howells
2020-11-20 15:14 ` [RFC PATCH 54/76] fscache: Provide resize operation David Howells
2020-11-20 15:14 ` [RFC PATCH 55/76] fscache: Remove the update operation David Howells
2020-11-20 15:14 ` [RFC PATCH 56/76] afs: Pass page into dirty region helpers to provide THP size David Howells
2020-11-20 15:14 ` [RFC PATCH 57/76] afs: Print the operation debug_id when logging an unexpected data version David Howells
2020-11-20 15:14 ` [RFC PATCH 58/76] afs: Move key to afs_read struct David Howells
2020-11-20 15:15 ` [RFC PATCH 59/76] afs: Don't truncate iter during data fetch David Howells
2020-11-20 15:15 ` [RFC PATCH 60/76] afs: Log remote unmarshalling errors David Howells
2020-11-20 15:15 ` [RFC PATCH 61/76] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2020-11-20 15:15 ` [RFC PATCH 62/76] afs: Use ITER_XARRAY for writing David Howells
2020-11-20 15:16 ` [RFC PATCH 63/76] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2020-11-20 15:16 ` [RFC PATCH 64/76] afs: Extract writeback extension into its own function David Howells
2020-11-20 15:16 ` [RFC PATCH 65/76] afs: Prepare for use of THPs David Howells
2020-11-20 15:16 ` [RFC PATCH 66/76] afs: Use the fs operation ops to handle FetchData completion David Howells
2020-11-20 15:17 ` [RFC PATCH 67/76] afs: Use new fscache read helper API David Howells
2020-11-20 15:17 ` [RFC PATCH 68/76] netfs: Add write_begin helper David Howells
2020-11-20 15:17 ` [RFC PATCH 69/76] fscache: Add support for writing to the cache David Howells
2020-11-20 15:17 ` [RFC PATCH 70/76] afs: Use the fscache_write_begin() helper David Howells
2020-11-20 15:18 ` [RFC PATCH 71/76] afs: Copy local writes to the cache when writing to the server David Howells
2020-11-20 15:18 ` [RFC PATCH 72/76] afs: Invoke fscache_resize_cookie() when handling ATTR_SIZE for setattr David Howells
2020-11-20 15:18 ` [RFC PATCH 73/76] afs: Add O_DIRECT read support David Howells
2020-11-20 15:18 ` [RFC PATCH 74/76] afs: Skip truncation on the server of data we haven't written yet David Howells
2020-11-20 15:19 ` [RFC PATCH 75/76] afs: Make afs_write_begin() return the THP subpage David Howells
2020-11-20 15:19 ` [RFC PATCH 76/76] afs: Fix speculative status fetch going out of order wrt to modifications David Howells

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