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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-07 20:49:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-07 20:49:51 -0700
commit5af43c24ca59a448c9312dd4a4a51d27ec3b9a73 (patch)
tree65288caabc91fc04242acace38789a6dd5b86ed4 /include
parent9affd6becbfb2c3f0d04e554bb87234761b37aba (diff)
parenta27bb332c04cec8c4afd7912df0dc7890db27560 (diff)
Merge branch 'akpm' (incoming from Andrew)
Merge more incoming from Andrew Morton: - Various fixes which were stalled or which I picked up recently - A large rotorooting of the AIO code. Allegedly to improve performance but I don't really have good performance numbers (I might have lost the email) and I can't raise Kent today. I held this out of 3.9 and we could give it another cycle if it's all too late/scary. I ended up taking only the first two thirds of the AIO rotorooting. I left the percpu parts and the batch completion for later. - Linus * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (33 commits) aio: don't include aio.h in sched.h aio: kill ki_retry aio: kill ki_key aio: give shared kioctx fields their own cachelines aio: kill struct aio_ring_info aio: kill batch allocation aio: change reqs_active to include unreaped completions aio: use cancellation list lazily aio: use flush_dcache_page() aio: make aio_read_evt() more efficient, convert to hrtimers wait: add wait_event_hrtimeout() aio: refcounting cleanup aio: make aio_put_req() lockless aio: do fget() after aio_get_req() aio: dprintk() -> pr_debug() aio: move private stuff out of aio.h aio: add kiocb_cancel() aio: kill return value of aio_complete() char: add aio_{read,write} to /dev/{null,zero} aio: remove retry-based AIO ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/aio.h178
-rw-r--r--include/linux/cgroup.h1
-rw-r--r--include/linux/errno.h1
-rw-r--r--include/linux/hugetlb.h19
-rw-r--r--include/linux/mm.h20
-rw-r--r--include/linux/pid_namespace.h1
-rw-r--r--include/linux/random.h7
-rw-r--r--include/linux/sched.h2
-rw-r--r--include/linux/wait.h86
-rw-r--r--include/linux/writeback.h1
10 files changed, 141 insertions, 175 deletions
diff --git a/include/linux/aio.h b/include/linux/aio.h
index 31ff6dba487..1bdf965339f 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -9,91 +9,32 @@
#include <linux/atomic.h>
-#define AIO_MAXSEGS 4
-#define AIO_KIOGRP_NR_ATOMIC 8
-
struct kioctx;
+struct kiocb;
-/* Notes on cancelling a kiocb:
- * If a kiocb is cancelled, aio_complete may return 0 to indicate
- * that cancel has not yet disposed of the kiocb. All cancel
- * operations *must* call aio_put_req to dispose of the kiocb
- * to guard against races with the completion code.
- */
-#define KIOCB_C_CANCELLED 0x01
-#define KIOCB_C_COMPLETE 0x02
-
-#define KIOCB_SYNC_KEY (~0U)
+#define KIOCB_KEY 0
-/* ki_flags bits */
/*
- * This may be used for cancel/retry serialization in the future, but
- * for now it's unused and we probably don't want modules to even
- * think they can use it.
+ * We use ki_cancel == KIOCB_CANCELLED to indicate that a kiocb has been either
+ * cancelled or completed (this makes a certain amount of sense because
+ * successful cancellation - io_cancel() - does deliver the completion to
+ * userspace).
+ *
+ * And since most things don't implement kiocb cancellation and we'd really like
+ * kiocb completion to be lockless when possible, we use ki_cancel to
+ * synchronize cancellation and completion - we only set it to KIOCB_CANCELLED
+ * with xchg() or cmpxchg(), see batch_complete_aio() and kiocb_cancel().
*/
-/* #define KIF_LOCKED 0 */
-#define KIF_KICKED 1
-#define KIF_CANCELLED 2
-
-#define kiocbTryLock(iocb) test_and_set_bit(KIF_LOCKED, &(iocb)->ki_flags)
-#define kiocbTryKick(iocb) test_and_set_bit(KIF_KICKED, &(iocb)->ki_flags)
+#define KIOCB_CANCELLED ((void *) (~0ULL))
-#define kiocbSetLocked(iocb) set_bit(KIF_LOCKED, &(iocb)->ki_flags)
-#define kiocbSetKicked(iocb) set_bit(KIF_KICKED, &(iocb)->ki_flags)
-#define kiocbSetCancelled(iocb) set_bit(KIF_CANCELLED, &(iocb)->ki_flags)
+typedef int (kiocb_cancel_fn)(struct kiocb *, struct io_event *);
-#define kiocbClearLocked(iocb) clear_bit(KIF_LOCKED, &(iocb)->ki_flags)
-#define kiocbClearKicked(iocb) clear_bit(KIF_KICKED, &(iocb)->ki_flags)
-#define kiocbClearCancelled(iocb) clear_bit(KIF_CANCELLED, &(iocb)->ki_flags)
-
-#define kiocbIsLocked(iocb) test_bit(KIF_LOCKED, &(iocb)->ki_flags)
-#define kiocbIsKicked(iocb) test_bit(KIF_KICKED, &(iocb)->ki_flags)
-#define kiocbIsCancelled(iocb) test_bit(KIF_CANCELLED, &(iocb)->ki_flags)
-
-/* is there a better place to document function pointer methods? */
-/**
- * ki_retry - iocb forward progress callback
- * @kiocb: The kiocb struct to advance by performing an operation.
- *
- * This callback is called when the AIO core wants a given AIO operation
- * to make forward progress. The kiocb argument describes the operation
- * that is to be performed. As the operation proceeds, perhaps partially,
- * ki_retry is expected to update the kiocb with progress made. Typically
- * ki_retry is set in the AIO core and it itself calls file_operations
- * helpers.
- *
- * ki_retry's return value determines when the AIO operation is completed
- * and an event is generated in the AIO event ring. Except the special
- * return values described below, the value that is returned from ki_retry
- * is transferred directly into the completion ring as the operation's
- * resulting status. Once this has happened ki_retry *MUST NOT* reference
- * the kiocb pointer again.
- *
- * If ki_retry returns -EIOCBQUEUED it has made a promise that aio_complete()
- * will be called on the kiocb pointer in the future. The AIO core will
- * not ask the method again -- ki_retry must ensure forward progress.
- * aio_complete() must be called once and only once in the future, multiple
- * calls may result in undefined behaviour.
- *
- * If ki_retry returns -EIOCBRETRY it has made a promise that kick_iocb()
- * will be called on the kiocb pointer in the future. This may happen
- * through generic helpers that associate kiocb->ki_wait with a wait
- * queue head that ki_retry uses via current->io_wait. It can also happen
- * with custom tracking and manual calls to kick_iocb(), though that is
- * discouraged. In either case, kick_iocb() must be called once and only
- * once. ki_retry must ensure forward progress, the AIO core will wait
- * indefinitely for kick_iocb() to be called.
- */
struct kiocb {
- struct list_head ki_run_list;
- unsigned long ki_flags;
- int ki_users;
- unsigned ki_key; /* id of this request */
+ atomic_t ki_users;
struct file *ki_filp;
- struct kioctx *ki_ctx; /* may be NULL for sync ops */
- int (*ki_cancel)(struct kiocb *, struct io_event *);
- ssize_t (*ki_retry)(struct kiocb *);
+ struct kioctx *ki_ctx; /* NULL for sync ops */
+ kiocb_cancel_fn *ki_cancel;
void (*ki_dtor)(struct kiocb *);
union {
@@ -117,7 +58,6 @@ struct kiocb {
struct list_head ki_list; /* the aio core uses this
* for cancellation */
- struct list_head ki_batch; /* batch allocation */
/*
* If the aio_resfd field of the userspace iocb is not zero,
@@ -128,106 +68,40 @@ struct kiocb {
static inline bool is_sync_kiocb(struct kiocb *kiocb)
{
- return kiocb->ki_key == KIOCB_SYNC_KEY;
+ return kiocb->ki_ctx == NULL;
}
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{
*kiocb = (struct kiocb) {
- .ki_users = 1,
- .ki_key = KIOCB_SYNC_KEY,
+ .ki_users = ATOMIC_INIT(1),
+ .ki_ctx = NULL,
.ki_filp = filp,
.ki_obj.tsk = current,
};
}
-#define AIO_RING_MAGIC 0xa10a10a1
-#define AIO_RING_COMPAT_FEATURES 1
-#define AIO_RING_INCOMPAT_FEATURES 0
-struct aio_ring {
- unsigned id; /* kernel internal index number */
- unsigned nr; /* number of io_events */
- unsigned head;
- unsigned tail;
-
- unsigned magic;
- unsigned compat_features;
- unsigned incompat_features;
- unsigned header_length; /* size of aio_ring */
-
-
- struct io_event io_events[0];
-}; /* 128 bytes + ring size */
-
-#define AIO_RING_PAGES 8
-struct aio_ring_info {
- unsigned long mmap_base;
- unsigned long mmap_size;
-
- struct page **ring_pages;
- spinlock_t ring_lock;
- long nr_pages;
-
- unsigned nr, tail;
-
- struct page *internal_pages[AIO_RING_PAGES];
-};
-
-static inline unsigned aio_ring_avail(struct aio_ring_info *info,
- struct aio_ring *ring)
-{
- return (ring->head + info->nr - 1 - ring->tail) % info->nr;
-}
-
-struct kioctx {
- atomic_t users;
- int dead;
- struct mm_struct *mm;
-
- /* This needs improving */
- unsigned long user_id;
- struct hlist_node list;
-
- wait_queue_head_t wait;
-
- spinlock_t ctx_lock;
-
- int reqs_active;
- struct list_head active_reqs; /* used for cancellation */
- struct list_head run_list; /* used for kicked reqs */
-
- /* sys_io_setup currently limits this to an unsigned int */
- unsigned max_reqs;
-
- struct aio_ring_info ring_info;
-
- struct delayed_work wq;
-
- struct rcu_head rcu_head;
-};
-
/* prototypes */
-extern unsigned aio_max_size;
-
#ifdef CONFIG_AIO
extern ssize_t wait_on_sync_kiocb(struct kiocb *iocb);
-extern int aio_put_req(struct kiocb *iocb);
-extern void kick_iocb(struct kiocb *iocb);
-extern int aio_complete(struct kiocb *iocb, long res, long res2);
+extern void aio_put_req(struct kiocb *iocb);
+extern void aio_complete(struct kiocb *iocb, long res, long res2);
struct mm_struct;
extern void exit_aio(struct mm_struct *mm);
extern long do_io_submit(aio_context_t ctx_id, long nr,
struct iocb __user *__user *iocbpp, bool compat);
+void kiocb_set_cancel_fn(struct kiocb *req, kiocb_cancel_fn *cancel);
#else
static inline ssize_t wait_on_sync_kiocb(struct kiocb *iocb) { return 0; }
-static inline int aio_put_req(struct kiocb *iocb) { return 0; }
-static inline void kick_iocb(struct kiocb *iocb) { }
-static inline int aio_complete(struct kiocb *iocb, long res, long res2) { return 0; }
+static inline void aio_put_req(struct kiocb *iocb) { }
+static inline void aio_complete(struct kiocb *iocb, long res, long res2) { }
struct mm_struct;
static inline void exit_aio(struct mm_struct *mm) { }
static inline long do_io_submit(aio_context_t ctx_id, long nr,
struct iocb __user * __user *iocbpp,
bool compat) { return 0; }
+static inline void kiocb_set_cancel_fn(struct kiocb *req,
+ kiocb_cancel_fn *cancel) { }
#endif /* CONFIG_AIO */
static inline struct kiocb *list_kiocb(struct list_head *h)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 3bff9ce09cf..5047355b9a0 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -28,6 +28,7 @@ struct cgroup_subsys;
struct inode;
struct cgroup;
struct css_id;
+struct eventfd_ctx;
extern int cgroup_init_early(void);
extern int cgroup_init(void);
diff --git a/include/linux/errno.h b/include/linux/errno.h
index f6bf082d4d4..89627b9187f 100644
--- a/include/linux/errno.h
+++ b/include/linux/errno.h
@@ -28,6 +28,5 @@
#define EBADTYPE 527 /* Type not supported by server */
#define EJUKEBOX 528 /* Request initiated, but will not complete before timeout */
#define EIOCBQUEUED 529 /* iocb queued, will get completion event */
-#define EIOCBRETRY 530 /* iocb queued, will trigger a retry */
#endif
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 3a62df310f2..6b4890fa57e 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -189,8 +189,7 @@ static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
-struct file *hugetlb_file_setup(const char *name, unsigned long addr,
- size_t size, vm_flags_t acct,
+struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
struct user_struct **user, int creat_flags,
int page_size_log);
@@ -209,8 +208,8 @@ static inline int is_file_hugepages(struct file *file)
#define is_file_hugepages(file) 0
static inline struct file *
-hugetlb_file_setup(const char *name, unsigned long addr, size_t size,
- vm_flags_t acctflag, struct user_struct **user, int creat_flags,
+hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
+ struct user_struct **user, int creat_flags,
int page_size_log)
{
return ERR_PTR(-ENOSYS);
@@ -288,6 +287,13 @@ static inline struct hstate *hstate_file(struct file *f)
return hstate_inode(file_inode(f));
}
+static inline struct hstate *hstate_sizelog(int page_size_log)
+{
+ if (!page_size_log)
+ return &default_hstate;
+ return size_to_hstate(1 << page_size_log);
+}
+
static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
return hstate_file(vma->vm_file);
@@ -352,11 +358,12 @@ static inline int hstate_index(struct hstate *h)
return h - hstates;
}
-#else
+#else /* CONFIG_HUGETLB_PAGE */
struct hstate {};
#define alloc_huge_page_node(h, nid) NULL
#define alloc_bootmem_huge_page(h) NULL
#define hstate_file(f) NULL
+#define hstate_sizelog(s) NULL
#define hstate_vma(v) NULL
#define hstate_inode(i) NULL
#define huge_page_size(h) PAGE_SIZE
@@ -371,6 +378,6 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
}
#define hstate_index_to_shift(index) 0
#define hstate_index(h) 0
-#endif
+#endif /* CONFIG_HUGETLB_PAGE */
#endif /* _LINUX_HUGETLB_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1a7f19e7f1a..e0c8528a41a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -951,13 +951,19 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
* (see walk_page_range for more details)
*/
struct mm_walk {
- int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *);
- int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *);
- int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *);
- int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *);
- int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *);
- int (*hugetlb_entry)(pte_t *, unsigned long,
- unsigned long, unsigned long, struct mm_walk *);
+ int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
+ unsigned long next, struct mm_walk *walk);
+ int (*pud_entry)(pud_t *pud, unsigned long addr,
+ unsigned long next, struct mm_walk *walk);
+ int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
+ unsigned long next, struct mm_walk *walk);
+ int (*pte_entry)(pte_t *pte, unsigned long addr,
+ unsigned long next, struct mm_walk *walk);
+ int (*pte_hole)(unsigned long addr, unsigned long next,
+ struct mm_walk *walk);
+ int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long next,
+ struct mm_walk *walk);
struct mm_struct *mm;
void *private;
};
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 731e4ecee3b..e2772666f00 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -4,6 +4,7 @@
#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/mm.h>
+#include <linux/workqueue.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>
diff --git a/include/linux/random.h b/include/linux/random.h
index 347ce553a30..3b9377d6b7a 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -29,13 +29,6 @@ u32 prandom_u32(void);
void prandom_bytes(void *buf, int nbytes);
void prandom_seed(u32 seed);
-/*
- * These macros are preserved for backward compatibility and should be
- * removed as soon as a transition is finished.
- */
-#define random32() prandom_u32()
-#define srandom32(seed) prandom_seed(seed)
-
u32 prandom_u32_state(struct rnd_state *);
void prandom_bytes_state(struct rnd_state *state, void *buf, int nbytes);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4800e9d1864..022c085ac3c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -313,8 +313,6 @@ extern void schedule_preempt_disabled(void);
struct nsproxy;
struct user_namespace;
-#include <linux/aio.h>
-
#ifdef CONFIG_MMU
extern void arch_pick_mmap_layout(struct mm_struct *mm);
extern unsigned long
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 7cb64d4b499..ac38be2692d 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -330,6 +330,92 @@ do { \
__ret; \
})
+#define __wait_event_hrtimeout(wq, condition, timeout, state) \
+({ \
+ int __ret = 0; \
+ DEFINE_WAIT(__wait); \
+ struct hrtimer_sleeper __t; \
+ \
+ hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, \
+ HRTIMER_MODE_REL); \
+ hrtimer_init_sleeper(&__t, current); \
+ if ((timeout).tv64 != KTIME_MAX) \
+ hrtimer_start_range_ns(&__t.timer, timeout, \
+ current->timer_slack_ns, \
+ HRTIMER_MODE_REL); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, state); \
+ if (condition) \
+ break; \
+ if (state == TASK_INTERRUPTIBLE && \
+ signal_pending(current)) { \
+ __ret = -ERESTARTSYS; \
+ break; \
+ } \
+ if (!__t.task) { \
+ __ret = -ETIME; \
+ break; \
+ } \
+ schedule(); \
+ } \
+ \
+ hrtimer_cancel(&__t.timer); \
+ destroy_hrtimer_on_stack(&__t.timer); \
+ finish_wait(&wq, &__wait); \
+ __ret; \
+})
+
+/**
+ * wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, as a ktime_t
+ *
+ * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * The @condition is checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function returns 0 if @condition became true, or -ETIME if the timeout
+ * elapsed.
+ */
+#define wait_event_hrtimeout(wq, condition, timeout) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __ret = __wait_event_hrtimeout(wq, condition, timeout, \
+ TASK_UNINTERRUPTIBLE); \
+ __ret; \
+})
+
+/**
+ * wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses
+ * @wq: the waitqueue to wait on
+ * @condition: a C expression for the event to wait for
+ * @timeout: timeout, as a ktime_t
+ *
+ * The process is put to sleep (TASK_INTERRUPTIBLE) until the
+ * @condition evaluates to true or a signal is received.
+ * The @condition is checked each time the waitqueue @wq is woken up.
+ *
+ * wake_up() has to be called after changing any variable that could
+ * change the result of the wait condition.
+ *
+ * The function returns 0 if @condition became true, -ERESTARTSYS if it was
+ * interrupted by a signal, or -ETIME if the timeout elapsed.
+ */
+#define wait_event_interruptible_hrtimeout(wq, condition, timeout) \
+({ \
+ long __ret = 0; \
+ if (!(condition)) \
+ __ret = __wait_event_hrtimeout(wq, condition, timeout, \
+ TASK_INTERRUPTIBLE); \
+ __ret; \
+})
+
#define __wait_event_interruptible_exclusive(wq, condition, ret) \
do { \
DEFINE_WAIT(__wait); \
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 9a9367c0c07..579a5007c69 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -5,6 +5,7 @@
#define WRITEBACK_H
#include <linux/sched.h>
+#include <linux/workqueue.h>
#include <linux/fs.h>
DECLARE_PER_CPU(int, dirty_throttle_leaks);