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authorDavid Howells <dhowells@redhat.com>2009-11-19 13:11:04 -0500
committerDavid Howells <dhowells@redhat.com>2009-11-19 13:11:04 -0500
commit4fbf4291aa15926cd4fdca0ffe9122e89d0459db (patch)
treeec2195c39ef8117acea598af4a5c20c77f67aa0b /fs/fscache/proc.c
parent440f0affe247e9990c8f8778f1861da4fd7d5e50 (diff)
FS-Cache: Allow the current state of all objects to be dumped
Allow the current state of all fscache objects to be dumped by doing: cat /proc/fs/fscache/objects By default, all objects and all fields will be shown. This can be restricted by adding a suitable key to one of the caller's keyrings (such as the session keyring): keyctl add user fscache:objlist "<restrictions>" @s The <restrictions> are: K Show hexdump of object key (don't show if not given) A Show hexdump of object aux data (don't show if not given) And paired restrictions: C Show objects that have a cookie c Show objects that don't have a cookie B Show objects that are busy b Show objects that aren't busy W Show objects that have pending writes w Show objects that don't have pending writes R Show objects that have outstanding reads r Show objects that don't have outstanding reads S Show objects that have slow work queued s Show objects that don't have slow work queued If neither side of a restriction pair is given, then both are implied. For example: keyctl add user fscache:objlist KB @s shows objects that are busy, and lists their object keys, but does not dump their auxiliary data. It also implies "CcWwRrSs", but as 'B' is given, 'b' is not implied. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/fscache/proc.c')
-rw-r--r--fs/fscache/proc.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index beeab44bc31a..1d9e4951a597 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -37,10 +37,20 @@ int __init fscache_proc_init(void)
37 goto error_histogram; 37 goto error_histogram;
38#endif 38#endif
39 39
40#ifdef CONFIG_FSCACHE_OBJECT_LIST
41 if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
42 &fscache_objlist_fops))
43 goto error_objects;
44#endif
45
40 _leave(" = 0"); 46 _leave(" = 0");
41 return 0; 47 return 0;
42 48
49#ifdef CONFIG_FSCACHE_OBJECT_LIST
50error_objects:
51#endif
43#ifdef CONFIG_FSCACHE_HISTOGRAM 52#ifdef CONFIG_FSCACHE_HISTOGRAM
53 remove_proc_entry("fs/fscache/histogram", NULL);
44error_histogram: 54error_histogram:
45#endif 55#endif
46#ifdef CONFIG_FSCACHE_STATS 56#ifdef CONFIG_FSCACHE_STATS
@@ -58,6 +68,9 @@ error_dir:
58 */ 68 */
59void fscache_proc_cleanup(void) 69void fscache_proc_cleanup(void)
60{ 70{
71#ifdef CONFIG_FSCACHE_OBJECT_LIST
72 remove_proc_entry("fs/fscache/objects", NULL);
73#endif
61#ifdef CONFIG_FSCACHE_HISTOGRAM 74#ifdef CONFIG_FSCACHE_HISTOGRAM
62 remove_proc_entry("fs/fscache/histogram", NULL); 75 remove_proc_entry("fs/fscache/histogram", NULL);
63#endif 76#endif