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Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-fscache

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* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-fscache: (31 commits)
  FS-Cache: Provide nop fscache_stat_d() if CONFIG_FSCACHE_STATS=n
  SLOW_WORK: Fix GFS2 to #include <linux/module.h> before using THIS_MODULE
  SLOW_WORK: Fix CIFS to pass THIS_MODULE to slow_work_register_user()
  CacheFiles: Don't log lookup/create failing with ENOBUFS
  CacheFiles: Catch an overly long wait for an old active object
  CacheFiles: Better showing of debugging information in active object problems
  CacheFiles: Mark parent directory locks as I_MUTEX_PARENT to keep lockdep happy
  CacheFiles: Handle truncate unlocking the page we're reading
  CacheFiles: Don't write a full page if there's only a partial page to cache
  FS-Cache: Actually requeue an object when requested
  FS-Cache: Start processing an object's operations on that object's death
  FS-Cache: Make sure FSCACHE_COOKIE_LOOKING_UP cleared on lookup failure
  FS-Cache: Add a retirement stat counter
  FS-Cache: Handle pages pending storage that get evicted under OOM conditions
  FS-Cache: Handle read request vs lookup, creation or other cache failure
  FS-Cache: Don't delete pending pages from the page-store tracking tree
  FS-Cache: Fix lock misorder in fscache_write_op()
  FS-Cache: The object-available state can't rely on the cookie to be available
  FS-Cache: Permit cache retrieval ops to be interrupted in the initial wait phase
  FS-Cache: Use radix tree preload correctly in tracking of pages to be stored
  ...
This commit is contained in:
Linus Torvalds
2009-11-30 13:33:48 -08:00
parent e3a41d7b99 4fa9f4ede8
commit 6e80133f7f
33 changed files with 2509 additions and 269 deletions
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40
include/linux/fscache-cache.h
View File

@@ -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 */
@@ -102,6 +104,16 @@ struct fscache_operation {
/* operation releaser */
fscache_operation_release_t release;
#ifdef CONFIG_SLOW_WORK_PROC
const char *name; /* operation name */
const char *state; /* operation state */
#define fscache_set_op_name(OP, N) do { (OP)->name = (N); } while(0)
#define fscache_set_op_state(OP, S) do { (OP)->state = (S); } while(0)
#else
#define fscache_set_op_name(OP, N) do { } while(0)
#define fscache_set_op_state(OP, S) do { } while(0)
#endif
};
extern atomic_t fscache_op_debug_id;
@@ -125,6 +137,7 @@ static inline void fscache_operation_init(struct fscache_operation *op,
op->debug_id = atomic_inc_return(&fscache_op_debug_id);
op->release = release;
INIT_LIST_HEAD(&op->pend_link);
fscache_set_op_state(op, "Init");
}
/**
@@ -221,8 +234,10 @@ struct fscache_cache_ops {
struct fscache_object *(*alloc_object)(struct fscache_cache *cache,
struct fscache_cookie *cookie);
/* look up the object for a cookie */
void (*lookup_object)(struct fscache_object *object);
/* look up the object for a cookie
* - return -ETIMEDOUT to be requeued
*/
int (*lookup_object)(struct fscache_object *object);
/* finished looking up */
void (*lookup_complete)(struct fscache_object *object);
@@ -297,12 +312,14 @@ struct fscache_cookie {
atomic_t usage; /* number of users of this cookie */
atomic_t n_children; /* number of children of this cookie */
spinlock_t lock;
spinlock_t stores_lock; /* lock on page store tree */
struct hlist_head backing_objects; /* object(s) backing this file/index */
const struct fscache_cookie_def *def; /* definition */
struct fscache_cookie *parent; /* parent of this entry */
void *netfs_data; /* back pointer to netfs */
struct radix_tree_root stores; /* pages to be stored on this cookie */
#define FSCACHE_COOKIE_PENDING_TAG 0 /* pages tag: pending write to cache */
#define FSCACHE_COOKIE_STORING_TAG 1 /* pages tag: writing to cache */
unsigned long flags;
#define FSCACHE_COOKIE_LOOKING_UP 0 /* T if non-index cookie being looked up still */
@@ -337,6 +354,7 @@ struct fscache_object {
FSCACHE_OBJECT_RECYCLING, /* retiring object */
FSCACHE_OBJECT_WITHDRAWING, /* withdrawing object */
FSCACHE_OBJECT_DEAD, /* object is now dead */
FSCACHE_OBJECT__NSTATES
} state;
int debug_id; /* debugging ID */
@@ -345,6 +363,7 @@ 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 */
@@ -358,6 +377,7 @@ 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 */
@@ -373,7 +393,11 @@ 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 */
};
extern const char *fscache_object_states[];
@@ -383,6 +407,10 @@ extern const char *fscache_object_states[];
(obj)->state >= FSCACHE_OBJECT_AVAILABLE && \
(obj)->state < FSCACHE_OBJECT_DYING)
#define fscache_object_is_dead(obj) \
(test_bit(FSCACHE_IOERROR, &(obj)->cache->flags) && \
(obj)->state >= FSCACHE_OBJECT_DYING)
extern const struct slow_work_ops fscache_object_slow_work_ops;
/**
@@ -414,6 +442,7 @@ void fscache_object_init(struct fscache_object *object,
object->events = object->event_mask = 0;
object->flags = 0;
object->store_limit = 0;
object->store_limit_l = 0;
object->cache = cache;
object->cookie = cookie;
object->parent = NULL;
@@ -422,6 +451,12 @@ 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
@@ -460,6 +495,7 @@ static inline void fscache_object_lookup_error(struct fscache_object *object)
static inline
void fscache_set_store_limit(struct fscache_object *object, loff_t i_size)
{
object->store_limit_l = i_size;
object->store_limit = i_size >> PAGE_SHIFT;
if (i_size & ~PAGE_MASK)
object->store_limit++;

27
include/linux/fscache.h
View File

@@ -202,6 +202,8 @@ extern int __fscache_write_page(struct fscache_cookie *, struct page *, gfp_t);
extern void __fscache_uncache_page(struct fscache_cookie *, struct page *);
extern bool __fscache_check_page_write(struct fscache_cookie *, struct page *);
extern void __fscache_wait_on_page_write(struct fscache_cookie *, struct page *);
extern bool __fscache_maybe_release_page(struct fscache_cookie *, struct page *,
gfp_t);
/**
* fscache_register_netfs - Register a filesystem as desiring caching services
@@ -615,4 +617,29 @@ void fscache_wait_on_page_write(struct fscache_cookie *cookie,
__fscache_wait_on_page_write(cookie, page);
}
/**
* fscache_maybe_release_page - Consider releasing a page, cancelling a store
* @cookie: The cookie representing the cache object
* @page: The netfs page that is being cached.
* @gfp: The gfp flags passed to releasepage()
*
* Consider releasing a page for the vmscan algorithm, on behalf of the netfs's
* releasepage() call. A storage request on the page may cancelled if it is
* not currently being processed.
*
* The function returns true if the page no longer has a storage request on it,
* and false if a storage request is left in place. If true is returned, the
* page will have been passed to fscache_uncache_page(). If false is returned
* the page cannot be freed yet.
*/
static inline
bool fscache_maybe_release_page(struct fscache_cookie *cookie,
struct page *page,
gfp_t gfp)
{
if (fscache_cookie_valid(cookie) && PageFsCache(page))
return __fscache_maybe_release_page(cookie, page, gfp);
return false;
}
#endif /* _LINUX_FSCACHE_H */

72
include/linux/slow-work.h
View File

@@ -17,13 +17,20 @@
#ifdef CONFIG_SLOW_WORK
#include <linux/sysctl.h>
#include <linux/timer.h>
struct slow_work;
#ifdef CONFIG_SLOW_WORK_PROC
struct seq_file;
#endif
/*
* The operations used to support slow work items
*/
struct slow_work_ops {
/* owner */
struct module *owner;
/* get a ref on a work item
* - return 0 if successful, -ve if not
*/
@@ -34,6 +41,11 @@ struct slow_work_ops {
/* execute a work item */
void (*execute)(struct slow_work *work);
#ifdef CONFIG_SLOW_WORK_PROC
/* describe a work item for /proc */
void (*desc)(struct slow_work *work, struct seq_file *m);
#endif
};
/*
@@ -42,13 +54,24 @@ struct slow_work_ops {
* queued
*/
struct slow_work {
struct module *owner; /* the owning module */
unsigned long flags;
#define SLOW_WORK_PENDING 0 /* item pending (further) execution */
#define SLOW_WORK_EXECUTING 1 /* item currently executing */
#define SLOW_WORK_ENQ_DEFERRED 2 /* item enqueue deferred */
#define SLOW_WORK_VERY_SLOW 3 /* item is very slow */
#define SLOW_WORK_CANCELLING 4 /* item is being cancelled, don't enqueue */
#define SLOW_WORK_DELAYED 5 /* item is struct delayed_slow_work with active timer */
const struct slow_work_ops *ops; /* operations table for this item */
struct list_head link; /* link in queue */
#ifdef CONFIG_SLOW_WORK_PROC
struct timespec mark; /* jiffies at which queued or exec begun */
#endif
};
struct delayed_slow_work {
struct slow_work work;
struct timer_list timer;
};
/**
@@ -66,6 +89,20 @@ static inline void slow_work_init(struct slow_work *work,
INIT_LIST_HEAD(&work->link);
}
/**
* slow_work_init - Initialise a delayed slow work item
* @work: The work item to initialise
* @ops: The operations to use to handle the slow work item
*
* Initialise a delayed slow work item.
*/
static inline void delayed_slow_work_init(struct delayed_slow_work *dwork,
const struct slow_work_ops *ops)
{
init_timer(&dwork->timer);
slow_work_init(&dwork->work, ops);
}
/**
* vslow_work_init - Initialise a very slow work item
* @work: The work item to initialise
@@ -83,9 +120,40 @@ static inline void vslow_work_init(struct slow_work *work,
INIT_LIST_HEAD(&work->link);
}
/**
* slow_work_is_queued - Determine if a slow work item is on the work queue
* work: The work item to test
*
* Determine if the specified slow-work item is on the work queue. This
* returns true if it is actually on the queue.
*
* If the item is executing and has been marked for requeue when execution
* finishes, then false will be returned.
*
* Anyone wishing to wait for completion of execution can wait on the
* SLOW_WORK_EXECUTING bit.
*/
static inline bool slow_work_is_queued(struct slow_work *work)
{
unsigned long flags = work->flags;
return flags & SLOW_WORK_PENDING && !(flags & SLOW_WORK_EXECUTING);
}
extern int slow_work_enqueue(struct slow_work *work);
extern int slow_work_register_user(void);
extern void slow_work_unregister_user(void);
extern void slow_work_cancel(struct slow_work *work);
extern int slow_work_register_user(struct module *owner);
extern void slow_work_unregister_user(struct module *owner);
extern int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
unsigned long delay);
static inline void delayed_slow_work_cancel(struct delayed_slow_work *dwork)
{
slow_work_cancel(&dwork->work);
}
extern bool slow_work_sleep_till_thread_needed(struct slow_work *work,
signed long *_timeout);
#ifdef CONFIG_SYSCTL
extern ctl_table slow_work_sysctls[];