FS-Cache: Allow the current state of all objects to be dumped

[mirror_ubuntu-zesty-kernel.git] / include / linux / fscache-cache.h

diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 7a9847ccd192033d3122a21a512a10bc8f76775b..184cbdfbcc992cc5e2dd234d8cc9a96162dcb68e 100644 (file)
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -91,6 +91,8 @@ struct fscache_operation {
 #define FSCACHE_OP_WAITING     4       /* cleared when op is woken */
 #define FSCACHE_OP_EXCLUSIVE   5       /* exclusive op, other ops must wait */
 #define FSCACHE_OP_DEAD                6       /* op is now dead */
+#define FSCACHE_OP_DEC_READ_CNT        7       /* decrement object->n_reads on destruction */
+#define FSCACHE_OP_KEEP_FLAGS  0xc0    /* flags to keep when repurposing an op */
 
        atomic_t                usage;
        unsigned                debug_id;       /* debugging ID */
@@ -357,6 +359,7 @@ struct fscache_object {
        int                     n_obj_ops;      /* number of object ops outstanding on object */
        int                     n_in_progress;  /* number of ops in progress */
        int                     n_exclusive;    /* number of exclusive ops queued */
+       atomic_t                n_reads;        /* number of read ops in progress */
        spinlock_t              lock;           /* state and operations lock */
 
        unsigned long           lookup_jif;     /* time at which lookup started */
@@ -370,6 +373,7 @@ struct fscache_object {
 #define FSCACHE_OBJECT_EV_RELEASE      4       /* T if netfs requested object release */
 #define FSCACHE_OBJECT_EV_RETIRE       5       /* T if netfs requested object retirement */
 #define FSCACHE_OBJECT_EV_WITHDRAW     6       /* T if cache requested object withdrawal */
+#define FSCACHE_OBJECT_EVENTS_MASK     0x7f    /* mask of all events*/
 
        unsigned long           flags;
 #define FSCACHE_OBJECT_LOCK            0       /* T if object is busy being processed */
@@ -385,6 +389,9 @@ 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 */
 };
 
@@ -434,6 +441,12 @@ void fscache_object_init(struct fscache_object *object,
 extern void fscache_object_lookup_negative(struct fscache_object *object);
 extern void fscache_obtained_object(struct fscache_object *object);
 
+#ifdef CONFIG_FSCACHE_OBJECT_LIST
+extern void fscache_object_destroy(struct fscache_object *object);
+#else
+#define fscache_object_destroy(object) do {} while(0)
+#endif
+
 /**
  * fscache_object_destroyed - Note destruction of an object in a cache
  * @cache: The cache from which the object came