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Merge branch 'for-3.8/drivers' of git://git.kernel.dk/linux-block

Browse Source 
Pull block driver update from Jens Axboe:
 "Now that the core bits are in, here are the driver bits for 3.8.  The
  branch contains:

   - A huge pile of drbd bits that were dumped from the 3.7 merge
     window.  Following that, it was both made perfectly clear that
     there is going to be no more over-the-wall pulls and how the
     situation on individual pulls can be improved.

   - A few cleanups from Akinobu Mita for drbd and cciss.

   - Queue improvement for loop from Lukas.  This grew into adding a
     generic interface for waiting/checking an even with a specific
     lock, allowing this to be pulled out of md and now loop and drbd is
     also using it.

   - A few fixes for xen back/front block driver from Roger Pau Monne.

   - Partition improvements from Stephen Warren, allowing partiion UUID
     to be used as an identifier."

* 'for-3.8/drivers' of git://git.kernel.dk/linux-block: (609 commits)
  drbd: update Kconfig to match current dependencies
  drbd: Fix drbdsetup wait-connect, wait-sync etc... commands
  drbd: close race between drbd_set_role and drbd_connect
  drbd: respect no-md-barriers setting also when changed online via disk-options
  drbd: Remove obsolete check
  drbd: fixup after wait_even_lock_irq() addition to generic code
  loop: Limit the number of requests in the bio list
  wait: add wait_event_lock_irq() interface
  xen-blkfront: free allocated page
  xen-blkback: move free persistent grants code
  block: partition: msdos: provide UUIDs for partitions
  init: reduce PARTUUID min length to 1 from 36
  block: store partition_meta_info.uuid as a string
  cciss: use check_signature()
  cciss: cleanup bitops usage
  drbd: use copy_highpage
  drbd: if the replication link breaks during handshake, keep retrying
  drbd: check return of kmalloc in receive_uuids
  drbd: Broadcast sync progress no more often than once per second
  drbd: don't try to clear bits once the disk has failed
  ...
This commit is contained in:
Linus Torvalds
2012-12-17 13:39:11 -08:00
parent 9360b53661 d2ec180c23
commit 9228ff9038
49 changed files with 13021 additions and 8737 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
include/linux/lru_cache.h
View File

@@ -166,9 +166,11 @@ struct lc_element {
/* if we want to track a larger set of objects,
* it needs to become arch independend u64 */
unsigned lc_number;
/* special label when on free list */
#define LC_FREE (~0U)
/* for pending changes */
unsigned lc_new_number;
};
struct lru_cache {
@@ -176,6 +178,7 @@ struct lru_cache {
struct list_head lru;
struct list_head free;
struct list_head in_use;
struct list_head to_be_changed;
/* the pre-created kmem cache to allocate the objects from */
struct kmem_cache *lc_cache;
@@ -186,7 +189,7 @@ struct lru_cache {
size_t element_off;
/* number of elements (indices) */
unsigned int nr_elements;
unsigned int nr_elements;
/* Arbitrary limit on maximum tracked objects. Practical limit is much
* lower due to allocation failures, probably. For typical use cases,
* nr_elements should be a few thousand at most.
@@ -194,18 +197,19 @@ struct lru_cache {
* 8 high bits of .lc_index to be overloaded with flags in the future. */
#define LC_MAX_ACTIVE (1<<24)
/* allow to accumulate a few (index:label) changes,
* but no more than max_pending_changes */
unsigned int max_pending_changes;
/* number of elements currently on to_be_changed list */
unsigned int pending_changes;
/* statistics */
unsigned used; /* number of lelements currently on in_use list */
unsigned long hits, misses, starving, dirty, changed;
unsigned used; /* number of elements currently on in_use list */
unsigned long hits, misses, starving, locked, changed;
/* see below: flag-bits for lru_cache */
unsigned long flags;
/* when changing the label of an index element */
unsigned int new_number;
/* for paranoia when changing the label of an index element */
struct lc_element *changing_element;
void *lc_private;
const char *name;
@@ -221,10 +225,15 @@ enum {
/* debugging aid, to catch concurrent access early.
* user needs to guarantee exclusive access by proper locking! */
__LC_PARANOIA,
/* if we need to change the set, but currently there is a changing
* transaction pending, we are "dirty", and must deferr further
* changing requests */
/* annotate that the set is "dirty", possibly accumulating further
* changes, until a transaction is finally triggered */
__LC_DIRTY,
/* Locked, no further changes allowed.
* Also used to serialize changing transactions. */
__LC_LOCKED,
/* if we need to change the set, but currently there is no free nor
* unused element available, we are "starving", and must not give out
* further references, to guarantee that eventually some refcnt will
@@ -236,9 +245,11 @@ enum {
};
#define LC_PARANOIA (1<<__LC_PARANOIA)
#define LC_DIRTY (1<<__LC_DIRTY)
#define LC_LOCKED (1<<__LC_LOCKED)
#define LC_STARVING (1<<__LC_STARVING)
extern struct lru_cache *lc_create(const char *name, struct kmem_cache *cache,
unsigned max_pending_changes,
unsigned e_count, size_t e_size, size_t e_off);
extern void lc_reset(struct lru_cache *lc);
extern void lc_destroy(struct lru_cache *lc);
@@ -249,7 +260,7 @@ extern struct lc_element *lc_try_get(struct lru_cache *lc, unsigned int enr);
extern struct lc_element *lc_find(struct lru_cache *lc, unsigned int enr);
extern struct lc_element *lc_get(struct lru_cache *lc, unsigned int enr);
extern unsigned int lc_put(struct lru_cache *lc, struct lc_element *e);
extern void lc_changed(struct lru_cache *lc, struct lc_element *e);
extern void lc_committed(struct lru_cache *lc);
struct seq_file;
extern size_t lc_seq_printf_stats(struct seq_file *seq, struct lru_cache *lc);
@@ -258,16 +269,28 @@ extern void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char
void (*detail) (struct seq_file *, struct lc_element *));
/**
* lc_try_lock - can be used to stop lc_get() from changing the tracked set
* lc_try_lock_for_transaction - can be used to stop lc_get() from changing the tracked set
* @lc: the lru cache to operate on
*
* Allows (expects) the set to be "dirty". Note that the reference counts and
* order on the active and lru lists may still change. Used to serialize
* changing transactions. Returns true if we aquired the lock.
*/
static inline int lc_try_lock_for_transaction(struct lru_cache *lc)
{
return !test_and_set_bit(__LC_LOCKED, &lc->flags);
}
/**
* lc_try_lock - variant to stop lc_get() from changing the tracked set
* @lc: the lru cache to operate on
*
* Note that the reference counts and order on the active and lru lists may
* still change. Returns true if we acquired the lock.
* still change. Only works on a "clean" set. Returns true if we aquired the
* lock, which means there are no pending changes, and any further attempt to
* change the set will not succeed until the next lc_unlock().
*/
static inline int lc_try_lock(struct lru_cache *lc)
{
return !test_and_set_bit(__LC_DIRTY, &lc->flags);
}
extern int lc_try_lock(struct lru_cache *lc);
/**
* lc_unlock - unlock @lc, allow lc_get() to change the set again
@@ -276,14 +299,10 @@ static inline int lc_try_lock(struct lru_cache *lc)
static inline void lc_unlock(struct lru_cache *lc)
{
clear_bit(__LC_DIRTY, &lc->flags);
smp_mb__after_clear_bit();
clear_bit_unlock(__LC_LOCKED, &lc->flags);
}
static inline int lc_is_used(struct lru_cache *lc, unsigned int enr)
{
struct lc_element *e = lc_find(lc, enr);
return e && e->refcnt;
}
extern bool lc_is_used(struct lru_cache *lc, unsigned int enr);
#define lc_entry(ptr, type, member) \
container_of(ptr, type, member)