#include "../fs/internal.h"
#include "io-wq.h"
+#include "io_uring_types.h"
+
#define IORING_MAX_ENTRIES 32768
#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8
#define IO_TCTX_REFS_CACHE_NR (1U << 10)
-struct io_uring {
- u32 head ____cacheline_aligned_in_smp;
- u32 tail ____cacheline_aligned_in_smp;
-};
-
-/*
- * This data is shared with the application through the mmap at offsets
- * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING.
- *
- * The offsets to the member fields are published through struct
- * io_sqring_offsets when calling io_uring_setup.
- */
-struct io_rings {
- /*
- * Head and tail offsets into the ring; the offsets need to be
- * masked to get valid indices.
- *
- * The kernel controls head of the sq ring and the tail of the cq ring,
- * and the application controls tail of the sq ring and the head of the
- * cq ring.
- */
- struct io_uring sq, cq;
- /*
- * Bitmasks to apply to head and tail offsets (constant, equals
- * ring_entries - 1)
- */
- u32 sq_ring_mask, cq_ring_mask;
- /* Ring sizes (constant, power of 2) */
- u32 sq_ring_entries, cq_ring_entries;
- /*
- * Number of invalid entries dropped by the kernel due to
- * invalid index stored in array
- *
- * Written by the kernel, shouldn't be modified by the
- * application (i.e. get number of "new events" by comparing to
- * cached value).
- *
- * After a new SQ head value was read by the application this
- * counter includes all submissions that were dropped reaching
- * the new SQ head (and possibly more).
- */
- u32 sq_dropped;
- /*
- * Runtime SQ flags
- *
- * Written by the kernel, shouldn't be modified by the
- * application.
- *
- * The application needs a full memory barrier before checking
- * for IORING_SQ_NEED_WAKEUP after updating the sq tail.
- */
- atomic_t sq_flags;
- /*
- * Runtime CQ flags
- *
- * Written by the application, shouldn't be modified by the
- * kernel.
- */
- u32 cq_flags;
- /*
- * Number of completion events lost because the queue was full;
- * this should be avoided by the application by making sure
- * there are not more requests pending than there is space in
- * the completion queue.
- *
- * Written by the kernel, shouldn't be modified by the
- * application (i.e. get number of "new events" by comparing to
- * cached value).
- *
- * As completion events come in out of order this counter is not
- * ordered with any other data.
- */
- u32 cq_overflow;
- /*
- * Ring buffer of completion events.
- *
- * The kernel writes completion events fresh every time they are
- * produced, so the application is allowed to modify pending
- * entries.
- */
- struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp;
-};
-
struct io_mapped_ubuf {
u64 ubuf;
u64 ubuf_end;
};
};
-struct io_file_table {
- struct io_fixed_file *files;
- unsigned long *bitmap;
- unsigned int alloc_hint;
-};
-
struct io_rsrc_node {
struct percpu_ref refs;
struct list_head node;
__u16 bgid;
};
-struct io_restriction {
- DECLARE_BITMAP(register_op, IORING_REGISTER_LAST);
- DECLARE_BITMAP(sqe_op, IORING_OP_LAST);
- u8 sqe_flags_allowed;
- u8 sqe_flags_required;
- bool registered;
-};
-
enum {
IO_SQ_THREAD_SHOULD_STOP = 0,
IO_SQ_THREAD_SHOULD_PARK,
#define IO_REQ_CACHE_SIZE 32
#define IO_REQ_ALLOC_BATCH 8
-struct io_submit_link {
- struct io_kiocb *head;
- struct io_kiocb *last;
-};
-
-struct io_submit_state {
- /* inline/task_work completion list, under ->uring_lock */
- struct io_wq_work_node free_list;
- /* batch completion logic */
- struct io_wq_work_list compl_reqs;
- struct io_submit_link link;
-
- bool plug_started;
- bool need_plug;
- bool flush_cqes;
- unsigned short submit_nr;
- struct blk_plug plug;
-};
-
-struct io_ev_fd {
- struct eventfd_ctx *cq_ev_fd;
- unsigned int eventfd_async: 1;
- struct rcu_head rcu;
-};
-
-#define BGID_ARRAY 64
-
-struct io_ring_ctx {
- /* const or read-mostly hot data */
- struct {
- struct percpu_ref refs;
-
- struct io_rings *rings;
- unsigned int flags;
- enum task_work_notify_mode notify_method;
- unsigned int compat: 1;
- unsigned int drain_next: 1;
- unsigned int restricted: 1;
- unsigned int off_timeout_used: 1;
- unsigned int drain_active: 1;
- unsigned int drain_disabled: 1;
- unsigned int has_evfd: 1;
- unsigned int syscall_iopoll: 1;
- } ____cacheline_aligned_in_smp;
-
- /* submission data */
- struct {
- struct mutex uring_lock;
-
- /*
- * Ring buffer of indices into array of io_uring_sqe, which is
- * mmapped by the application using the IORING_OFF_SQES offset.
- *
- * This indirection could e.g. be used to assign fixed
- * io_uring_sqe entries to operations and only submit them to
- * the queue when needed.
- *
- * The kernel modifies neither the indices array nor the entries
- * array.
- */
- u32 *sq_array;
- struct io_uring_sqe *sq_sqes;
- unsigned cached_sq_head;
- unsigned sq_entries;
- struct list_head defer_list;
-
- /*
- * Fixed resources fast path, should be accessed only under
- * uring_lock, and updated through io_uring_register(2)
- */
- struct io_rsrc_node *rsrc_node;
- int rsrc_cached_refs;
- atomic_t cancel_seq;
- struct io_file_table file_table;
- unsigned nr_user_files;
- unsigned nr_user_bufs;
- struct io_mapped_ubuf **user_bufs;
-
- struct io_submit_state submit_state;
-
- struct io_buffer_list *io_bl;
- struct xarray io_bl_xa;
- struct list_head io_buffers_cache;
-
- struct list_head timeout_list;
- struct list_head ltimeout_list;
- struct list_head cq_overflow_list;
- struct list_head apoll_cache;
- struct xarray personalities;
- u32 pers_next;
- unsigned sq_thread_idle;
- } ____cacheline_aligned_in_smp;
-
- /* IRQ completion list, under ->completion_lock */
- struct io_wq_work_list locked_free_list;
- unsigned int locked_free_nr;
-
- const struct cred *sq_creds; /* cred used for __io_sq_thread() */
- struct io_sq_data *sq_data; /* if using sq thread polling */
-
- struct wait_queue_head sqo_sq_wait;
- struct list_head sqd_list;
-
- unsigned long check_cq;
-
- struct {
- /*
- * We cache a range of free CQEs we can use, once exhausted it
- * should go through a slower range setup, see __io_get_cqe()
- */
- struct io_uring_cqe *cqe_cached;
- struct io_uring_cqe *cqe_sentinel;
-
- unsigned cached_cq_tail;
- unsigned cq_entries;
- struct io_ev_fd __rcu *io_ev_fd;
- struct wait_queue_head cq_wait;
- unsigned cq_extra;
- atomic_t cq_timeouts;
- unsigned cq_last_tm_flush;
- } ____cacheline_aligned_in_smp;
-
- struct {
- spinlock_t completion_lock;
-
- spinlock_t timeout_lock;
-
- /*
- * ->iopoll_list is protected by the ctx->uring_lock for
- * io_uring instances that don't use IORING_SETUP_SQPOLL.
- * For SQPOLL, only the single threaded io_sq_thread() will
- * manipulate the list, hence no extra locking is needed there.
- */
- struct io_wq_work_list iopoll_list;
- struct hlist_head *cancel_hash;
- unsigned cancel_hash_bits;
- bool poll_multi_queue;
-
- struct list_head io_buffers_comp;
- } ____cacheline_aligned_in_smp;
-
- struct io_restriction restrictions;
-
- /* slow path rsrc auxilary data, used by update/register */
- struct {
- struct io_rsrc_node *rsrc_backup_node;
- struct io_mapped_ubuf *dummy_ubuf;
- struct io_rsrc_data *file_data;
- struct io_rsrc_data *buf_data;
-
- struct delayed_work rsrc_put_work;
- struct llist_head rsrc_put_llist;
- struct list_head rsrc_ref_list;
- spinlock_t rsrc_ref_lock;
-
- struct list_head io_buffers_pages;
- };
-
- /* Keep this last, we don't need it for the fast path */
- struct {
- #if defined(CONFIG_UNIX)
- struct socket *ring_sock;
- #endif
- /* hashed buffered write serialization */
- struct io_wq_hash *hash_map;
-
- /* Only used for accounting purposes */
- struct user_struct *user;
- struct mm_struct *mm_account;
-
- /* ctx exit and cancelation */
- struct llist_head fallback_llist;
- struct delayed_work fallback_work;
- struct work_struct exit_work;
- struct list_head tctx_list;
- struct completion ref_comp;
- u32 iowq_limits[2];
- bool iowq_limits_set;
- };
-};
+#define BGID_ARRAY 64
/*
* Arbitrary limit, can be raised if need be
struct filename *filename;
};
-enum {
- REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT,
- REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT,
- REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT,
- REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT,
- REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT,
- REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT,
- REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT,
-
- /* first byte is taken by user flags, shift it to not overlap */
- REQ_F_FAIL_BIT = 8,
- REQ_F_INFLIGHT_BIT,
- REQ_F_CUR_POS_BIT,
- REQ_F_NOWAIT_BIT,
- REQ_F_LINK_TIMEOUT_BIT,
- REQ_F_NEED_CLEANUP_BIT,
- REQ_F_POLLED_BIT,
- REQ_F_BUFFER_SELECTED_BIT,
- REQ_F_BUFFER_RING_BIT,
- REQ_F_COMPLETE_INLINE_BIT,
- REQ_F_REISSUE_BIT,
- REQ_F_CREDS_BIT,
- REQ_F_REFCOUNT_BIT,
- REQ_F_ARM_LTIMEOUT_BIT,
- REQ_F_ASYNC_DATA_BIT,
- REQ_F_SKIP_LINK_CQES_BIT,
- REQ_F_SINGLE_POLL_BIT,
- REQ_F_DOUBLE_POLL_BIT,
- REQ_F_PARTIAL_IO_BIT,
- REQ_F_CQE32_INIT_BIT,
- REQ_F_APOLL_MULTISHOT_BIT,
- REQ_F_CLEAR_POLLIN_BIT,
- /* keep async read/write and isreg together and in order */
- REQ_F_SUPPORT_NOWAIT_BIT,
- REQ_F_ISREG_BIT,
-
- /* not a real bit, just to check we're not overflowing the space */
- __REQ_F_LAST_BIT,
-};
-
-enum {
- /* ctx owns file */
- REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT),
- /* drain existing IO first */
- REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT),
- /* linked sqes */
- REQ_F_LINK = BIT(REQ_F_LINK_BIT),
- /* doesn't sever on completion < 0 */
- REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT),
- /* IOSQE_ASYNC */
- REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT),
- /* IOSQE_BUFFER_SELECT */
- REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT),
- /* IOSQE_CQE_SKIP_SUCCESS */
- REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT),
-
- /* fail rest of links */
- REQ_F_FAIL = BIT(REQ_F_FAIL_BIT),
- /* on inflight list, should be cancelled and waited on exit reliably */
- REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT),
- /* read/write uses file position */
- REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT),
- /* must not punt to workers */
- REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT),
- /* has or had linked timeout */
- REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT),
- /* needs cleanup */
- REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT),
- /* already went through poll handler */
- REQ_F_POLLED = BIT(REQ_F_POLLED_BIT),
- /* buffer already selected */
- REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT),
- /* buffer selected from ring, needs commit */
- REQ_F_BUFFER_RING = BIT(REQ_F_BUFFER_RING_BIT),
- /* completion is deferred through io_comp_state */
- REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT),
- /* caller should reissue async */
- REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT),
- /* supports async reads/writes */
- REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT),
- /* regular file */
- REQ_F_ISREG = BIT(REQ_F_ISREG_BIT),
- /* has creds assigned */
- REQ_F_CREDS = BIT(REQ_F_CREDS_BIT),
- /* skip refcounting if not set */
- REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT),
- /* there is a linked timeout that has to be armed */
- REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT),
- /* ->async_data allocated */
- REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT),
- /* don't post CQEs while failing linked requests */
- REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT),
- /* single poll may be active */
- REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT),
- /* double poll may active */
- REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT),
- /* request has already done partial IO */
- REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT),
- /* fast poll multishot mode */
- REQ_F_APOLL_MULTISHOT = BIT(REQ_F_APOLL_MULTISHOT_BIT),
- /* ->extra1 and ->extra2 are initialised */
- REQ_F_CQE32_INIT = BIT(REQ_F_CQE32_INIT_BIT),
- /* recvmsg special flag, clear EPOLLIN */
- REQ_F_CLEAR_POLLIN = BIT(REQ_F_CLEAR_POLLIN_BIT),
-};
-
struct async_poll {
struct io_poll poll;
struct io_poll *double_poll;
};
-typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked);
-
-struct io_task_work {
- union {
- struct io_wq_work_node node;
- struct llist_node fallback_node;
- };
- io_req_tw_func_t func;
-};
-
enum {
IORING_RSRC_FILE = 0,
IORING_RSRC_BUFFER = 1,
};
-struct io_cqe {
- __u64 user_data;
- __s32 res;
- /* fd initially, then cflags for completion */
- union {
- __u32 flags;
- int fd;
- };
-};
-
enum {
IO_CHECK_CQ_OVERFLOW_BIT,
IO_CHECK_CQ_DROPPED_BIT,
};
-/*
- * Each request type overlays its private data structure on top of this one.
- * They must not exceed this one in size.
- */
-struct io_cmd_data {
- struct file *file;
- /* each command gets 56 bytes of data */
- __u8 data[56];
-};
-
-#define io_kiocb_to_cmd(req) ((void *) &(req)->cmd)
-#define cmd_to_io_kiocb(ptr) ((struct io_kiocb *) ptr)
-
-struct io_kiocb {
- union {
- /*
- * NOTE! Each of the io_kiocb union members has the file pointer
- * as the first entry in their struct definition. So you can
- * access the file pointer through any of the sub-structs,
- * or directly as just 'file' in this struct.
- */
- struct file *file;
- struct io_cmd_data cmd;
- };
-
- u8 opcode;
- /* polled IO has completed */
- u8 iopoll_completed;
- /*
- * Can be either a fixed buffer index, or used with provided buffers.
- * For the latter, before issue it points to the buffer group ID,
- * and after selection it points to the buffer ID itself.
- */
- u16 buf_index;
- unsigned int flags;
-
- struct io_cqe cqe;
-
- struct io_ring_ctx *ctx;
- struct task_struct *task;
-
- struct io_rsrc_node *rsrc_node;
-
- union {
- /* store used ubuf, so we can prevent reloading */
- struct io_mapped_ubuf *imu;
-
- /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */
- struct io_buffer *kbuf;
-
- /*
- * stores buffer ID for ring provided buffers, valid IFF
- * REQ_F_BUFFER_RING is set.
- */
- struct io_buffer_list *buf_list;
- };
-
- union {
- /* used by request caches, completion batching and iopoll */
- struct io_wq_work_node comp_list;
- /* cache ->apoll->events */
- __poll_t apoll_events;
- };
- atomic_t refs;
- atomic_t poll_refs;
- struct io_task_work io_task_work;
- /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
- union {
- struct hlist_node hash_node;
- struct {
- u64 extra1;
- u64 extra2;
- };
- };
- /* internal polling, see IORING_FEAT_FAST_POLL */
- struct async_poll *apoll;
- /* opcode allocated if it needs to store data for async defer */
- void *async_data;
- /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */
- struct io_kiocb *link;
- /* custom credentials, valid IFF REQ_F_CREDS is set */
- const struct cred *creds;
- struct io_wq_work work;
-};
-
struct io_tctx_node {
struct list_head ctx_node;
struct task_struct *task;
--- /dev/null
+#ifndef IO_URING_TYPES_H
+#define IO_URING_TYPES_H
+
+#include <linux/blkdev.h>
+#include <linux/task_work.h>
+
+#include "io-wq.h"
+
+struct io_uring {
+ u32 head ____cacheline_aligned_in_smp;
+ u32 tail ____cacheline_aligned_in_smp;
+};
+
+/*
+ * This data is shared with the application through the mmap at offsets
+ * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING.
+ *
+ * The offsets to the member fields are published through struct
+ * io_sqring_offsets when calling io_uring_setup.
+ */
+struct io_rings {
+ /*
+ * Head and tail offsets into the ring; the offsets need to be
+ * masked to get valid indices.
+ *
+ * The kernel controls head of the sq ring and the tail of the cq ring,
+ * and the application controls tail of the sq ring and the head of the
+ * cq ring.
+ */
+ struct io_uring sq, cq;
+ /*
+ * Bitmasks to apply to head and tail offsets (constant, equals
+ * ring_entries - 1)
+ */
+ u32 sq_ring_mask, cq_ring_mask;
+ /* Ring sizes (constant, power of 2) */
+ u32 sq_ring_entries, cq_ring_entries;
+ /*
+ * Number of invalid entries dropped by the kernel due to
+ * invalid index stored in array
+ *
+ * Written by the kernel, shouldn't be modified by the
+ * application (i.e. get number of "new events" by comparing to
+ * cached value).
+ *
+ * After a new SQ head value was read by the application this
+ * counter includes all submissions that were dropped reaching
+ * the new SQ head (and possibly more).
+ */
+ u32 sq_dropped;
+ /*
+ * Runtime SQ flags
+ *
+ * Written by the kernel, shouldn't be modified by the
+ * application.
+ *
+ * The application needs a full memory barrier before checking
+ * for IORING_SQ_NEED_WAKEUP after updating the sq tail.
+ */
+ atomic_t sq_flags;
+ /*
+ * Runtime CQ flags
+ *
+ * Written by the application, shouldn't be modified by the
+ * kernel.
+ */
+ u32 cq_flags;
+ /*
+ * Number of completion events lost because the queue was full;
+ * this should be avoided by the application by making sure
+ * there are not more requests pending than there is space in
+ * the completion queue.
+ *
+ * Written by the kernel, shouldn't be modified by the
+ * application (i.e. get number of "new events" by comparing to
+ * cached value).
+ *
+ * As completion events come in out of order this counter is not
+ * ordered with any other data.
+ */
+ u32 cq_overflow;
+ /*
+ * Ring buffer of completion events.
+ *
+ * The kernel writes completion events fresh every time they are
+ * produced, so the application is allowed to modify pending
+ * entries.
+ */
+ struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp;
+};
+
+struct io_restriction {
+ DECLARE_BITMAP(register_op, IORING_REGISTER_LAST);
+ DECLARE_BITMAP(sqe_op, IORING_OP_LAST);
+ u8 sqe_flags_allowed;
+ u8 sqe_flags_required;
+ bool registered;
+};
+
+struct io_submit_link {
+ struct io_kiocb *head;
+ struct io_kiocb *last;
+};
+
+struct io_submit_state {
+ /* inline/task_work completion list, under ->uring_lock */
+ struct io_wq_work_node free_list;
+ /* batch completion logic */
+ struct io_wq_work_list compl_reqs;
+ struct io_submit_link link;
+
+ bool plug_started;
+ bool need_plug;
+ bool flush_cqes;
+ unsigned short submit_nr;
+ struct blk_plug plug;
+};
+
+struct io_ev_fd {
+ struct eventfd_ctx *cq_ev_fd;
+ unsigned int eventfd_async: 1;
+ struct rcu_head rcu;
+};
+
+struct io_file_table {
+ struct io_fixed_file *files;
+ unsigned long *bitmap;
+ unsigned int alloc_hint;
+};
+
+struct io_ring_ctx {
+ /* const or read-mostly hot data */
+ struct {
+ struct percpu_ref refs;
+
+ struct io_rings *rings;
+ unsigned int flags;
+ enum task_work_notify_mode notify_method;
+ unsigned int compat: 1;
+ unsigned int drain_next: 1;
+ unsigned int restricted: 1;
+ unsigned int off_timeout_used: 1;
+ unsigned int drain_active: 1;
+ unsigned int drain_disabled: 1;
+ unsigned int has_evfd: 1;
+ unsigned int syscall_iopoll: 1;
+ } ____cacheline_aligned_in_smp;
+
+ /* submission data */
+ struct {
+ struct mutex uring_lock;
+
+ /*
+ * Ring buffer of indices into array of io_uring_sqe, which is
+ * mmapped by the application using the IORING_OFF_SQES offset.
+ *
+ * This indirection could e.g. be used to assign fixed
+ * io_uring_sqe entries to operations and only submit them to
+ * the queue when needed.
+ *
+ * The kernel modifies neither the indices array nor the entries
+ * array.
+ */
+ u32 *sq_array;
+ struct io_uring_sqe *sq_sqes;
+ unsigned cached_sq_head;
+ unsigned sq_entries;
+ struct list_head defer_list;
+
+ /*
+ * Fixed resources fast path, should be accessed only under
+ * uring_lock, and updated through io_uring_register(2)
+ */
+ struct io_rsrc_node *rsrc_node;
+ int rsrc_cached_refs;
+ atomic_t cancel_seq;
+ struct io_file_table file_table;
+ unsigned nr_user_files;
+ unsigned nr_user_bufs;
+ struct io_mapped_ubuf **user_bufs;
+
+ struct io_submit_state submit_state;
+
+ struct io_buffer_list *io_bl;
+ struct xarray io_bl_xa;
+ struct list_head io_buffers_cache;
+
+ struct list_head timeout_list;
+ struct list_head ltimeout_list;
+ struct list_head cq_overflow_list;
+ struct list_head apoll_cache;
+ struct xarray personalities;
+ u32 pers_next;
+ unsigned sq_thread_idle;
+ } ____cacheline_aligned_in_smp;
+
+ /* IRQ completion list, under ->completion_lock */
+ struct io_wq_work_list locked_free_list;
+ unsigned int locked_free_nr;
+
+ const struct cred *sq_creds; /* cred used for __io_sq_thread() */
+ struct io_sq_data *sq_data; /* if using sq thread polling */
+
+ struct wait_queue_head sqo_sq_wait;
+ struct list_head sqd_list;
+
+ unsigned long check_cq;
+
+ struct {
+ /*
+ * We cache a range of free CQEs we can use, once exhausted it
+ * should go through a slower range setup, see __io_get_cqe()
+ */
+ struct io_uring_cqe *cqe_cached;
+ struct io_uring_cqe *cqe_sentinel;
+
+ unsigned cached_cq_tail;
+ unsigned cq_entries;
+ struct io_ev_fd __rcu *io_ev_fd;
+ struct wait_queue_head cq_wait;
+ unsigned cq_extra;
+ atomic_t cq_timeouts;
+ unsigned cq_last_tm_flush;
+ } ____cacheline_aligned_in_smp;
+
+ struct {
+ spinlock_t completion_lock;
+
+ spinlock_t timeout_lock;
+
+ /*
+ * ->iopoll_list is protected by the ctx->uring_lock for
+ * io_uring instances that don't use IORING_SETUP_SQPOLL.
+ * For SQPOLL, only the single threaded io_sq_thread() will
+ * manipulate the list, hence no extra locking is needed there.
+ */
+ struct io_wq_work_list iopoll_list;
+ struct hlist_head *cancel_hash;
+ unsigned cancel_hash_bits;
+ bool poll_multi_queue;
+
+ struct list_head io_buffers_comp;
+ } ____cacheline_aligned_in_smp;
+
+ struct io_restriction restrictions;
+
+ /* slow path rsrc auxilary data, used by update/register */
+ struct {
+ struct io_rsrc_node *rsrc_backup_node;
+ struct io_mapped_ubuf *dummy_ubuf;
+ struct io_rsrc_data *file_data;
+ struct io_rsrc_data *buf_data;
+
+ struct delayed_work rsrc_put_work;
+ struct llist_head rsrc_put_llist;
+ struct list_head rsrc_ref_list;
+ spinlock_t rsrc_ref_lock;
+
+ struct list_head io_buffers_pages;
+ };
+
+ /* Keep this last, we don't need it for the fast path */
+ struct {
+ #if defined(CONFIG_UNIX)
+ struct socket *ring_sock;
+ #endif
+ /* hashed buffered write serialization */
+ struct io_wq_hash *hash_map;
+
+ /* Only used for accounting purposes */
+ struct user_struct *user;
+ struct mm_struct *mm_account;
+
+ /* ctx exit and cancelation */
+ struct llist_head fallback_llist;
+ struct delayed_work fallback_work;
+ struct work_struct exit_work;
+ struct list_head tctx_list;
+ struct completion ref_comp;
+ u32 iowq_limits[2];
+ bool iowq_limits_set;
+ };
+};
+
+enum {
+ REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT,
+ REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT,
+ REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT,
+ REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT,
+ REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT,
+ REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT,
+ REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT,
+
+ /* first byte is taken by user flags, shift it to not overlap */
+ REQ_F_FAIL_BIT = 8,
+ REQ_F_INFLIGHT_BIT,
+ REQ_F_CUR_POS_BIT,
+ REQ_F_NOWAIT_BIT,
+ REQ_F_LINK_TIMEOUT_BIT,
+ REQ_F_NEED_CLEANUP_BIT,
+ REQ_F_POLLED_BIT,
+ REQ_F_BUFFER_SELECTED_BIT,
+ REQ_F_BUFFER_RING_BIT,
+ REQ_F_COMPLETE_INLINE_BIT,
+ REQ_F_REISSUE_BIT,
+ REQ_F_CREDS_BIT,
+ REQ_F_REFCOUNT_BIT,
+ REQ_F_ARM_LTIMEOUT_BIT,
+ REQ_F_ASYNC_DATA_BIT,
+ REQ_F_SKIP_LINK_CQES_BIT,
+ REQ_F_SINGLE_POLL_BIT,
+ REQ_F_DOUBLE_POLL_BIT,
+ REQ_F_PARTIAL_IO_BIT,
+ REQ_F_CQE32_INIT_BIT,
+ REQ_F_APOLL_MULTISHOT_BIT,
+ REQ_F_CLEAR_POLLIN_BIT,
+ /* keep async read/write and isreg together and in order */
+ REQ_F_SUPPORT_NOWAIT_BIT,
+ REQ_F_ISREG_BIT,
+
+ /* not a real bit, just to check we're not overflowing the space */
+ __REQ_F_LAST_BIT,
+};
+
+enum {
+ /* ctx owns file */
+ REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT),
+ /* drain existing IO first */
+ REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT),
+ /* linked sqes */
+ REQ_F_LINK = BIT(REQ_F_LINK_BIT),
+ /* doesn't sever on completion < 0 */
+ REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT),
+ /* IOSQE_ASYNC */
+ REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT),
+ /* IOSQE_BUFFER_SELECT */
+ REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT),
+ /* IOSQE_CQE_SKIP_SUCCESS */
+ REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT),
+
+ /* fail rest of links */
+ REQ_F_FAIL = BIT(REQ_F_FAIL_BIT),
+ /* on inflight list, should be cancelled and waited on exit reliably */
+ REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT),
+ /* read/write uses file position */
+ REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT),
+ /* must not punt to workers */
+ REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT),
+ /* has or had linked timeout */
+ REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT),
+ /* needs cleanup */
+ REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT),
+ /* already went through poll handler */
+ REQ_F_POLLED = BIT(REQ_F_POLLED_BIT),
+ /* buffer already selected */
+ REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT),
+ /* buffer selected from ring, needs commit */
+ REQ_F_BUFFER_RING = BIT(REQ_F_BUFFER_RING_BIT),
+ /* completion is deferred through io_comp_state */
+ REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT),
+ /* caller should reissue async */
+ REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT),
+ /* supports async reads/writes */
+ REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT),
+ /* regular file */
+ REQ_F_ISREG = BIT(REQ_F_ISREG_BIT),
+ /* has creds assigned */
+ REQ_F_CREDS = BIT(REQ_F_CREDS_BIT),
+ /* skip refcounting if not set */
+ REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT),
+ /* there is a linked timeout that has to be armed */
+ REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT),
+ /* ->async_data allocated */
+ REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT),
+ /* don't post CQEs while failing linked requests */
+ REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT),
+ /* single poll may be active */
+ REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT),
+ /* double poll may active */
+ REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT),
+ /* request has already done partial IO */
+ REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT),
+ /* fast poll multishot mode */
+ REQ_F_APOLL_MULTISHOT = BIT(REQ_F_APOLL_MULTISHOT_BIT),
+ /* ->extra1 and ->extra2 are initialised */
+ REQ_F_CQE32_INIT = BIT(REQ_F_CQE32_INIT_BIT),
+ /* recvmsg special flag, clear EPOLLIN */
+ REQ_F_CLEAR_POLLIN = BIT(REQ_F_CLEAR_POLLIN_BIT),
+};
+
+typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked);
+
+struct io_task_work {
+ union {
+ struct io_wq_work_node node;
+ struct llist_node fallback_node;
+ };
+ io_req_tw_func_t func;
+};
+
+struct io_cqe {
+ __u64 user_data;
+ __s32 res;
+ /* fd initially, then cflags for completion */
+ union {
+ __u32 flags;
+ int fd;
+ };
+};
+
+/*
+ * Each request type overlays its private data structure on top of this one.
+ * They must not exceed this one in size.
+ */
+struct io_cmd_data {
+ struct file *file;
+ /* each command gets 56 bytes of data */
+ __u8 data[56];
+};
+
+#define io_kiocb_to_cmd(req) ((void *) &(req)->cmd)
+#define cmd_to_io_kiocb(ptr) ((struct io_kiocb *) ptr)
+
+struct io_kiocb {
+ union {
+ /*
+ * NOTE! Each of the io_kiocb union members has the file pointer
+ * as the first entry in their struct definition. So you can
+ * access the file pointer through any of the sub-structs,
+ * or directly as just 'file' in this struct.
+ */
+ struct file *file;
+ struct io_cmd_data cmd;
+ };
+
+ u8 opcode;
+ /* polled IO has completed */
+ u8 iopoll_completed;
+ /*
+ * Can be either a fixed buffer index, or used with provided buffers.
+ * For the latter, before issue it points to the buffer group ID,
+ * and after selection it points to the buffer ID itself.
+ */
+ u16 buf_index;
+ unsigned int flags;
+
+ struct io_cqe cqe;
+
+ struct io_ring_ctx *ctx;
+ struct task_struct *task;
+
+ struct io_rsrc_node *rsrc_node;
+
+ union {
+ /* store used ubuf, so we can prevent reloading */
+ struct io_mapped_ubuf *imu;
+
+ /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */
+ struct io_buffer *kbuf;
+
+ /*
+ * stores buffer ID for ring provided buffers, valid IFF
+ * REQ_F_BUFFER_RING is set.
+ */
+ struct io_buffer_list *buf_list;
+ };
+
+ union {
+ /* used by request caches, completion batching and iopoll */
+ struct io_wq_work_node comp_list;
+ /* cache ->apoll->events */
+ __poll_t apoll_events;
+ };
+ atomic_t refs;
+ atomic_t poll_refs;
+ struct io_task_work io_task_work;
+ /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
+ union {
+ struct hlist_node hash_node;
+ struct {
+ u64 extra1;
+ u64 extra2;
+ };
+ };
+ /* internal polling, see IORING_FEAT_FAST_POLL */
+ struct async_poll *apoll;
+ /* opcode allocated if it needs to store data for async defer */
+ void *async_data;
+ /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */
+ struct io_kiocb *link;
+ /* custom credentials, valid IFF REQ_F_CREDS is set */
+ const struct cred *creds;
+ struct io_wq_work work;
+};
+
+#endif
projects / linux-2.6-microblaze.git / commitdiff