diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-12 02:10:08 +0300 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-12 02:10:08 +0300 |
commit | b961f8dc8976c091180839f4483d67b7c2ca2578 (patch) | |
tree | a9e1971a1b0868f0ce1ad64d817cd4c6ad6b6ff6 /fs | |
parent | a58dfea29731a93339529ce48fe239b383011c7c (diff) | |
parent | 65a6543da386838f935d2f03f452c5c0acff2a68 (diff) |
Merge tag 'io_uring-5.8-2020-06-11' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"A few late stragglers in here. In particular:
- Validate full range for provided buffers (Bijan)
- Fix bad use of kfree() in buffer registration failure (Denis)
- Don't allow close of ring itself, it's not fully safe. Making it
fully safe would require making the system call more expensive,
which isn't worth it.
- Buffer selection fix
- Regression fix for O_NONBLOCK retry
- Make IORING_OP_ACCEPT honor O_NONBLOCK (Jiufei)
- Restrict opcode handling for SQ/IOPOLL (Pavel)
- io-wq work handling cleanups and improvements (Pavel, Xiaoguang)
- IOPOLL race fix (Xiaoguang)"
* tag 'io_uring-5.8-2020-06-11' of git://git.kernel.dk/linux-block:
io_uring: fix io_kiocb.flags modification race in IOPOLL mode
io_uring: check file O_NONBLOCK state for accept
io_uring: avoid unnecessary io_wq_work copy for fast poll feature
io_uring: avoid whole io_wq_work copy for requests completed inline
io_uring: allow O_NONBLOCK async retry
io_wq: add per-wq work handler instead of per work
io_uring: don't arm a timeout through work.func
io_uring: remove custom ->func handlers
io_uring: don't derive close state from ->func
io_uring: use kvfree() in io_sqe_buffer_register()
io_uring: validate the full range of provided buffers for access
io_uring: re-set iov base/len for buffer select retry
io_uring: move send/recv IOPOLL check into prep
io_uring: deduplicate io_openat{,2}_prep()
io_uring: do build_open_how() only once
io_uring: fix {SQ,IO}POLL with unsupported opcodes
io_uring: disallow close of ring itself
Diffstat (limited to 'fs')
-rw-r--r-- | fs/io-wq.c | 10 | ||||
-rw-r--r-- | fs/io-wq.h | 8 | ||||
-rw-r--r-- | fs/io_uring.c | 424 |
3 files changed, 201 insertions, 241 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c index a5e90ac39e4d..0b65a912b036 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -111,6 +111,7 @@ struct io_wq { unsigned long state; free_work_fn *free_work; + io_wq_work_fn *do_work; struct task_struct *manager; struct user_struct *user; @@ -523,7 +524,7 @@ get_next: hash = io_get_work_hash(work); linked = old_work = work; - linked->func(&linked); + wq->do_work(&linked); linked = (old_work == linked) ? NULL : linked; work = next_hashed; @@ -780,7 +781,7 @@ static void io_run_cancel(struct io_wq_work *work, struct io_wqe *wqe) struct io_wq_work *old_work = work; work->flags |= IO_WQ_WORK_CANCEL; - work->func(&work); + wq->do_work(&work); work = (work == old_work) ? NULL : work; wq->free_work(old_work); } while (work); @@ -1018,7 +1019,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) int ret = -ENOMEM, node; struct io_wq *wq; - if (WARN_ON_ONCE(!data->free_work)) + if (WARN_ON_ONCE(!data->free_work || !data->do_work)) return ERR_PTR(-EINVAL); wq = kzalloc(sizeof(*wq), GFP_KERNEL); @@ -1032,6 +1033,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) } wq->free_work = data->free_work; + wq->do_work = data->do_work; /* caller must already hold a reference to this */ wq->user = data->user; @@ -1088,7 +1090,7 @@ err: bool io_wq_get(struct io_wq *wq, struct io_wq_data *data) { - if (data->free_work != wq->free_work) + if (data->free_work != wq->free_work || data->do_work != wq->do_work) return false; return refcount_inc_not_zero(&wq->use_refs); diff --git a/fs/io-wq.h b/fs/io-wq.h index 5ba12de7572f..8e138fa88b9f 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -85,7 +85,6 @@ static inline void wq_list_del(struct io_wq_work_list *list, struct io_wq_work { struct io_wq_work_node list; - void (*func)(struct io_wq_work **); struct files_struct *files; struct mm_struct *mm; const struct cred *creds; @@ -94,11 +93,6 @@ struct io_wq_work { pid_t task_pid; }; -#define INIT_IO_WORK(work, _func) \ - do { \ - *(work) = (struct io_wq_work){ .func = _func }; \ - } while (0) \ - static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) { if (!work->list.next) @@ -108,10 +102,12 @@ static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) } typedef void (free_work_fn)(struct io_wq_work *); +typedef void (io_wq_work_fn)(struct io_wq_work **); struct io_wq_data { struct user_struct *user; + io_wq_work_fn *do_work; free_work_fn *free_work; }; diff --git a/fs/io_uring.c b/fs/io_uring.c index 26f7bc941d01..155f3d830ddb 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -528,7 +528,6 @@ enum { REQ_F_INFLIGHT_BIT, REQ_F_CUR_POS_BIT, REQ_F_NOWAIT_BIT, - REQ_F_IOPOLL_COMPLETED_BIT, REQ_F_LINK_TIMEOUT_BIT, REQ_F_TIMEOUT_BIT, REQ_F_ISREG_BIT, @@ -540,6 +539,8 @@ enum { REQ_F_POLLED_BIT, REQ_F_BUFFER_SELECTED_BIT, REQ_F_NO_FILE_TABLE_BIT, + REQ_F_QUEUE_TIMEOUT_BIT, + REQ_F_WORK_INITIALIZED_BIT, /* not a real bit, just to check we're not overflowing the space */ __REQ_F_LAST_BIT, @@ -571,8 +572,6 @@ enum { REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), /* must not punt to workers */ REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), - /* polled IO has completed */ - REQ_F_IOPOLL_COMPLETED = BIT(REQ_F_IOPOLL_COMPLETED_BIT), /* has linked timeout */ REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), /* timeout request */ @@ -595,6 +594,10 @@ enum { REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), /* doesn't need file table for this request */ REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), + /* needs to queue linked timeout */ + REQ_F_QUEUE_TIMEOUT = BIT(REQ_F_QUEUE_TIMEOUT_BIT), + /* io_wq_work is initialized */ + REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), }; struct async_poll { @@ -633,6 +636,8 @@ struct io_kiocb { struct io_async_ctx *io; int cflags; u8 opcode; + /* polled IO has completed */ + u8 iopoll_completed; u16 buf_index; @@ -697,6 +702,8 @@ struct io_op_def { unsigned needs_mm : 1; /* needs req->file assigned */ unsigned needs_file : 1; + /* don't fail if file grab fails */ + unsigned needs_file_no_error : 1; /* hash wq insertion if file is a regular file */ unsigned hash_reg_file : 1; /* unbound wq insertion if file is a non-regular file */ @@ -803,6 +810,8 @@ static const struct io_op_def io_op_defs[] = { .needs_fs = 1, }, [IORING_OP_CLOSE] = { + .needs_file = 1, + .needs_file_no_error = 1, .file_table = 1, }, [IORING_OP_FILES_UPDATE] = { @@ -903,6 +912,19 @@ EXPORT_SYMBOL(io_uring_get_socket); static void io_file_put_work(struct work_struct *work); +/* + * Note: must call io_req_init_async() for the first time you + * touch any members of io_wq_work. + */ +static inline void io_req_init_async(struct io_kiocb *req) +{ + if (req->flags & REQ_F_WORK_INITIALIZED) + return; + + memset(&req->work, 0, sizeof(req->work)); + req->flags |= REQ_F_WORK_INITIALIZED; +} + static inline bool io_async_submit(struct io_ring_ctx *ctx) { return ctx->flags & IORING_SETUP_SQPOLL; @@ -1029,6 +1051,9 @@ static inline void io_req_work_grab_env(struct io_kiocb *req, static inline void io_req_work_drop_env(struct io_kiocb *req) { + if (!(req->flags & REQ_F_WORK_INITIALIZED)) + return; + if (req->work.mm) { mmdrop(req->work.mm); req->work.mm = NULL; @@ -1575,16 +1600,6 @@ static void io_free_req(struct io_kiocb *req) io_queue_async_work(nxt); } -static void io_link_work_cb(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - struct io_kiocb *link; - - link = list_first_entry(&req->link_list, struct io_kiocb, link_list); - io_queue_linked_timeout(link); - io_wq_submit_work(workptr); -} - static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) { struct io_kiocb *link; @@ -1596,7 +1611,7 @@ static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) *workptr = &nxt->work; link = io_prep_linked_timeout(nxt); if (link) - nxt->work.func = io_link_work_cb; + nxt->flags |= REQ_F_QUEUE_TIMEOUT; } /* @@ -1781,7 +1796,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, * If we find a request that requires polling, break out * and complete those lists first, if we have entries there. */ - if (req->flags & REQ_F_IOPOLL_COMPLETED) { + if (READ_ONCE(req->iopoll_completed)) { list_move_tail(&req->list, &done); continue; } @@ -1962,7 +1977,7 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) req_set_fail_links(req); req->result = res; if (res != -EAGAIN) - req->flags |= REQ_F_IOPOLL_COMPLETED; + WRITE_ONCE(req->iopoll_completed, 1); } /* @@ -1995,7 +2010,7 @@ static void io_iopoll_req_issued(struct io_kiocb *req) * For fast devices, IO may have already completed. If it has, add * it to the front so we find it first. */ - if (req->flags & REQ_F_IOPOLL_COMPLETED) + if (READ_ONCE(req->iopoll_completed)) list_add(&req->list, &ctx->poll_list); else list_add_tail(&req->list, &ctx->poll_list); @@ -2063,6 +2078,10 @@ static bool io_file_supports_async(struct file *file, int rw) if (S_ISREG(mode) && file->f_op != &io_uring_fops) return true; + /* any ->read/write should understand O_NONBLOCK */ + if (file->f_flags & O_NONBLOCK) + return true; + if (!(file->f_mode & FMODE_NOWAIT)) return false; @@ -2105,8 +2124,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, kiocb->ki_ioprio = get_current_ioprio(); /* don't allow async punt if RWF_NOWAIT was requested */ - if ((kiocb->ki_flags & IOCB_NOWAIT) || - (req->file->f_flags & O_NONBLOCK)) + if (kiocb->ki_flags & IOCB_NOWAIT) req->flags |= REQ_F_NOWAIT; if (force_nonblock) @@ -2120,6 +2138,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, kiocb->ki_flags |= IOCB_HIPRI; kiocb->ki_complete = io_complete_rw_iopoll; req->result = 0; + req->iopoll_completed = 0; } else { if (kiocb->ki_flags & IOCB_HIPRI) return -EINVAL; @@ -2358,8 +2377,14 @@ static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, bool needs_lock) { - if (req->flags & REQ_F_BUFFER_SELECTED) + if (req->flags & REQ_F_BUFFER_SELECTED) { + struct io_buffer *kbuf; + + kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; + iov[0].iov_base = u64_to_user_ptr(kbuf->addr); + iov[0].iov_len = kbuf->len; return 0; + } if (!req->rw.len) return 0; else if (req->rw.len > 1) @@ -2741,7 +2766,8 @@ copy_iov: if (ret) goto out_free; /* any defer here is final, must blocking retry */ - if (!file_can_poll(req->file)) + if (!(req->flags & REQ_F_NOWAIT) && + !file_can_poll(req->file)) req->flags |= REQ_F_MUST_PUNT; return -EAGAIN; } @@ -2761,6 +2787,8 @@ static int __io_splice_prep(struct io_kiocb *req, if (req->flags & REQ_F_NEED_CLEANUP) return 0; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; sp->file_in = NULL; sp->len = READ_ONCE(sqe->len); @@ -2775,8 +2803,14 @@ static int __io_splice_prep(struct io_kiocb *req, return ret; req->flags |= REQ_F_NEED_CLEANUP; - if (!S_ISREG(file_inode(sp->file_in)->i_mode)) + if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { + /* + * Splice operation will be punted aync, and here need to + * modify io_wq_work.flags, so initialize io_wq_work firstly. + */ + io_req_init_async(req); req->work.flags |= IO_WQ_WORK_UNBOUND; + } return 0; } @@ -2885,23 +2919,15 @@ static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; } -static bool io_req_cancelled(struct io_kiocb *req) -{ - if (req->work.flags & IO_WQ_WORK_CANCEL) { - req_set_fail_links(req); - io_cqring_add_event(req, -ECANCELED); - io_put_req(req); - return true; - } - - return false; -} - -static void __io_fsync(struct io_kiocb *req) +static int io_fsync(struct io_kiocb *req, bool force_nonblock) { loff_t end = req->sync.off + req->sync.len; int ret; + /* fsync always requires a blocking context */ + if (force_nonblock) + return -EAGAIN; + ret = vfs_fsync_range(req->file, req->sync.off, end > 0 ? end : LLONG_MAX, req->sync.flags & IORING_FSYNC_DATASYNC); @@ -2909,58 +2935,16 @@ static void __io_fsync(struct io_kiocb *req) req_set_fail_links(req); io_cqring_add_event(req, ret); io_put_req(req); -} - -static void io_fsync_finish(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - - if (io_req_cancelled(req)) - return; - __io_fsync(req); - io_steal_work(req, workptr); -} - -static int io_fsync(struct io_kiocb *req, bool force_nonblock) -{ - /* fsync always requires a blocking context */ - if (force_nonblock) { - req->work.func = io_fsync_finish; - return -EAGAIN; - } - __io_fsync(req); return 0; } -static void __io_fallocate(struct io_kiocb *req) -{ - int ret; - - current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; - ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, - req->sync.len); - current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; - if (ret < 0) - req_set_fail_links(req); - io_cqring_add_event(req, ret); - io_put_req(req); -} - -static void io_fallocate_finish(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - - if (io_req_cancelled(req)) - return; - __io_fallocate(req); - io_steal_work(req, workptr); -} - static int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; req->sync.off = READ_ONCE(sqe->off); req->sync.len = READ_ONCE(sqe->addr); @@ -2971,66 +2955,74 @@ static int io_fallocate_prep(struct io_kiocb *req, static int io_fallocate(struct io_kiocb *req, bool force_nonblock) { + int ret; + /* fallocate always requiring blocking context */ - if (force_nonblock) { - req->work.func = io_fallocate_finish; + if (force_nonblock) return -EAGAIN; - } - __io_fallocate(req); + current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; + ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, + req->sync.len); + current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; + if (ret < 0) + req_set_fail_links(req); + io_cqring_add_event(req, ret); + io_put_req(req); return 0; } -static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { const char __user *fname; int ret; - if (sqe->ioprio || sqe->buf_index) + if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) return -EINVAL; - if (req->flags & REQ_F_FIXED_FILE) + if (unlikely(sqe->ioprio || sqe->buf_index)) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) return -EBADF; - if (req->flags & REQ_F_NEED_CLEANUP) - return 0; - req->open.dfd = READ_ONCE(sqe->fd); - req->open.how.mode = READ_ONCE(sqe->len); - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); - req->open.how.flags = READ_ONCE(sqe->open_flags); - if (force_o_largefile()) + /* open.how should be already initialised */ + if (!(req->open.how.flags & O_PATH) && force_o_largefile()) req->open.how.flags |= O_LARGEFILE; + req->open.dfd = READ_ONCE(sqe->fd); + fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); req->open.filename = getname(fname); if (IS_ERR(req->open.filename)) { ret = PTR_ERR(req->open.filename); req->open.filename = NULL; return ret; } - req->open.nofile = rlimit(RLIMIT_NOFILE); req->flags |= REQ_F_NEED_CLEANUP; return 0; } +static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + u64 flags, mode; + + if (req->flags & REQ_F_NEED_CLEANUP) + return 0; + mode = READ_ONCE(sqe->len); + flags = READ_ONCE(sqe->open_flags); + req->open.how = build_open_how(flags, mode); + return __io_openat_prep(req, sqe); +} + static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct open_how __user *how; - const char __user *fname; size_t len; int ret; - if (sqe->ioprio || sqe->buf_index) - return -EINVAL; - if (req->flags & REQ_F_FIXED_FILE) - return -EBADF; if (req->flags & REQ_F_NEED_CLEANUP) return 0; - - req->open.dfd = READ_ONCE(sqe->fd); - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); len = READ_ONCE(sqe->len); - if (len < OPEN_HOW_SIZE_VER0) return -EINVAL; @@ -3039,19 +3031,7 @@ static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) if (ret) return ret; - if (!(req->open.how.flags & O_PATH) && force_o_largefile()) - req->open.how.flags |= O_LARGEFILE; - - req->open.filename = getname(fname); - if (IS_ERR(req->open.filename)) { - ret = PTR_ERR(req->open.filename); - req->open.filename = NULL; - return ret; - } - - req->open.nofile = rlimit(RLIMIT_NOFILE); - req->flags |= REQ_F_NEED_CLEANUP; - return 0; + return __io_openat_prep(req, sqe); } static int io_openat2(struct io_kiocb *req, bool force_nonblock) @@ -3091,7 +3071,6 @@ err: static int io_openat(struct io_kiocb *req, bool force_nonblock) { - req->open.how = build_open_how(req->open.how.flags, req->open.how.mode); return io_openat2(req, force_nonblock); } @@ -3180,7 +3159,7 @@ static int io_provide_buffers_prep(struct io_kiocb *req, p->addr = READ_ONCE(sqe->addr); p->len = READ_ONCE(sqe->len); - if (!access_ok(u64_to_user_ptr(p->addr), p->len)) + if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) return -EFAULT; p->bgid = READ_ONCE(sqe->buf_group); @@ -3258,6 +3237,8 @@ static int io_epoll_ctl_prep(struct io_kiocb *req, #if defined(CONFIG_EPOLL) if (sqe->ioprio || sqe->buf_index) return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; req->epoll.epfd = READ_ONCE(sqe->fd); req->epoll.op = READ_ONCE(sqe->len); @@ -3302,6 +3283,8 @@ static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) if (sqe->ioprio || sqe->buf_index || sqe->off) return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; req->madvise.addr = READ_ONCE(sqe->addr); req->madvise.len = READ_ONCE(sqe->len); @@ -3336,6 +3319,8 @@ static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { if (sqe->ioprio || sqe->buf_index || sqe->addr) return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; req->fadvise.offset = READ_ONCE(sqe->off); req->fadvise.len = READ_ONCE(sqe->len); @@ -3369,6 +3354,8 @@ static int io_fadvise(struct io_kiocb *req, bool force_nonblock) static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; if (sqe->ioprio || sqe->buf_index) return -EINVAL; if (req->flags & REQ_F_FIXED_FILE) @@ -3409,10 +3396,14 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { /* * If we queue this for async, it must not be cancellable. That would - * leave the 'file' in an undeterminate state. + * leave the 'file' in an undeterminate state, and here need to modify + * io_wq_work.flags, so initialize io_wq_work firstly. */ + io_req_init_async(req); req->work.flags |= IO_WQ_WORK_NO_CANCEL; + if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) + return -EINVAL; if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || sqe->rw_flags || sqe->buf_index) return -EINVAL; @@ -3420,53 +3411,41 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return -EBADF; req->close.fd = READ_ONCE(sqe->fd); - return 0; -} - -/* only called when __close_fd_get_file() is done */ -static void __io_close_finish(struct io_kiocb *req) -{ - int ret; - - ret = filp_close(req->close.put_file, req->work.files); - if (ret < 0) - req_set_fail_links(req); - io_cqring_add_event(req, ret); - fput(req->close.put_file); - io_put_req(req); -} - -static void io_close_finish(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); + if ((req->file && req->file->f_op == &io_uring_fops) || + req->close.fd == req->ctx->ring_fd) + return -EBADF; - /* not cancellable, don't do io_req_cancelled() */ - __io_close_finish(req); - io_steal_work(req, workptr); + req->close.put_file = NULL; + return 0; } static int io_close(struct io_kiocb *req, bool force_nonblock) { + struct io_close *close = &req->close; int ret; - req->close.put_file = NULL; - ret = __close_fd_get_file(req->close.fd, &req->close.put_file); - if (ret < 0) - return (ret == -ENOENT) ? -EBADF : ret; + /* might be already done during nonblock submission */ + if (!close->put_file) { + ret = __close_fd_get_file(close->fd, &close->put_file); + if (ret < 0) + return (ret == -ENOENT) ? -EBADF : ret; + } /* if the file has a flush method, be safe and punt to async */ - if (req->close.put_file->f_op->flush && force_nonblock) { + if (close->put_file->f_op->flush && force_nonblock) { /* avoid grabbing files - we don't need the files */ req->flags |= REQ_F_NO_FILE_TABLE | REQ_F_MUST_PUNT; - req->work.func = io_close_finish; return -EAGAIN; } - /* - * No ->flush(), safely close from here and just punt the - * fput() to async context. - */ - __io_close_finish(req); + /* No ->flush() or already async, safely close from here */ + ret = filp_close(close->put_file, req->work.files); + if (ret < 0) + req_set_fail_links(req); + io_cqring_add_event(req, ret); + fput(close->put_file); + close->put_file = NULL; + io_put_req(req); return 0; } @@ -3488,38 +3467,20 @@ static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; } -static void __io_sync_file_range(struct io_kiocb *req) +static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) { int ret; + /* sync_file_range always requires a blocking context */ + if (force_nonblock) + return -EAGAIN; + ret = sync_file_range(req->file, req->sync.off, req->sync.len, req->sync.flags); if (ret < 0) req_set_fail_links(req); io_cqring_add_event(req, ret); io_put_req(req); -} - - -static void io_sync_file_range_finish(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - - if (io_req_cancelled(req)) - return; - __io_sync_file_range(req); - io_steal_work(req, workptr); -} - -static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) -{ - /* sync_file_range always requires a blocking context */ - if (force_nonblock) { - req->work.func = io_sync_file_range_finish; - return -EAGAIN; - } - - __io_sync_file_range(req); return 0; } @@ -3545,6 +3506,9 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) struct io_async_ctx *io = req->io; int ret; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + sr->msg_flags = READ_ONCE(sqe->msg_flags); sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); sr->len = READ_ONCE(sqe->len); @@ -3574,9 +3538,6 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) struct socket *sock; int ret; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - sock = sock_from_file(req->file, &ret); if (sock) { struct io_async_ctx io; @@ -3630,9 +3591,6 @@ static int io_send(struct io_kiocb *req, bool force_nonblock) struct socket *sock; int ret; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - sock = sock_from_file(req->file, &ret); if (sock) { struct io_sr_msg *sr = &req->sr_msg; @@ -3785,6 +3743,9 @@ static int io_recvmsg_prep(struct io_kiocb *req, struct io_async_ctx *io = req->io; int ret; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + sr->msg_flags = READ_ONCE(sqe->msg_flags); sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); sr->len = READ_ONCE(sqe->len); @@ -3813,9 +3774,6 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) struct socket *sock; int ret, cflags = 0; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - sock = sock_from_file(req->file, &ret); if (sock) { struct io_buffer *kbuf; @@ -3877,9 +3835,6 @@ static int io_recv(struct io_kiocb *req, bool force_nonblock) struct socket *sock; int ret, cflags = 0; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - sock = sock_from_file(req->file, &ret); if (sock) { struct io_sr_msg *sr = &req->sr_msg; @@ -3947,49 +3902,30 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; } -static int __io_accept(struct io_kiocb *req, bool force_nonblock) +static int io_accept(struct io_kiocb *req, bool force_nonblock) { struct io_accept *accept = &req->accept; - unsigned file_flags; + unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; int ret; - file_flags = force_nonblock ? O_NONBLOCK : 0; + if (req->file->f_flags & O_NONBLOCK) + req->flags |= REQ_F_NOWAIT; + ret = __sys_accept4_file(req->file, file_flags, accept->addr, accept->addr_len, accept->flags, accept->nofile); if (ret == -EAGAIN && force_nonblock) return -EAGAIN; - if (ret == -ERESTARTSYS) - ret = -EINTR; - if (ret < 0) + if (ret < 0) { + if (ret == -ERESTARTSYS) + ret = -EINTR; req_set_fail_links(req); + } io_cqring_add_event(req, ret); io_put_req(req); return 0; } -static void io_accept_finish(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - - if (io_req_cancelled(req)) - return; - __io_accept(req, false); - io_steal_work(req, workptr); -} - -static int io_accept(struct io_kiocb *req, bool force_nonblock) -{ - int ret; - - ret = __io_accept(req, force_nonblock); - if (ret == -EAGAIN && force_nonblock) { - req->work.func = io_accept_finish; - return -EAGAIN; - } - return 0; -} - static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_connect *conn = &req->connect; @@ -4328,7 +4264,8 @@ static void io_async_task_func(struct callback_head *cb) spin_unlock_irq(&ctx->completion_lock); /* restore ->work in case we need to retry again */ - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, sizeof(req->work)); kfree(apoll); if (!canceled) { @@ -4425,7 +4362,8 @@ static bool io_arm_poll_handler(struct io_kiocb *req) return false; req->flags |= REQ_F_POLLED; - memcpy(&apoll->work, &req->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&apoll->work, &req->work, sizeof(req->work)); had_io = req->io != NULL; get_task_struct(current); @@ -4450,7 +4388,8 @@ static bool io_arm_poll_handler(struct io_kiocb *req) if (!had_io) io_poll_remove_double(req); spin_unlock_irq(&ctx->completion_lock); - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, sizeof(req->work)); kfree(apoll); return false; } @@ -4495,7 +4434,9 @@ static bool io_poll_remove_one(struct io_kiocb *req) * io_req_work_drop_env below when dropping the * final reference. */ - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, + sizeof(req->work)); kfree(apoll); } } @@ -4944,6 +4885,8 @@ static int io_req_defer_prep(struct io_kiocb *req, if (!sqe) return 0; + io_req_init_async(req); + if (io_op_defs[req->opcode].file_table) { ret = io_grab_files(req); if (unlikely(ret)) @@ -5381,12 +5324,26 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, return 0; } +static void io_arm_async_linked_timeout(struct io_kiocb *req) +{ + struct io_kiocb *link; + + /* link head's timeout is queued in io_queue_async_work() */ + if (!(req->flags & REQ_F_QUEUE_TIMEOUT)) + return; + + link = list_first_entry(&req->link_list, struct io_kiocb, link_list); + io_queue_linked_timeout(link); +} + static void io_wq_submit_work(struct io_wq_work **workptr) { struct io_wq_work *work = *workptr; struct io_kiocb *req = container_of(work, struct io_kiocb, work); int ret = 0; + io_arm_async_linked_timeout(req); + /* if NO_CANCEL is set, we must still run the work */ if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == IO_WQ_WORK_CANCEL) { @@ -5437,19 +5394,20 @@ static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, return -EBADF; fd = array_index_nospec(fd, ctx->nr_user_files); file = io_file_from_index(ctx, fd); - if (!file) - return -EBADF; - req->fixed_file_refs = ctx->file_data->cur_refs; - percpu_ref_get(req->fixed_file_refs); + if (file) { + req->fixed_file_refs = ctx->file_data->cur_refs; + percpu_ref_get(req->fixed_file_refs); + } } else { trace_io_uring_file_get(ctx, fd); file = __io_file_get(state, fd); - if (unlikely(!file)) - return -EBADF; } - *out_file = file; - return 0; + if (file || io_op_defs[req->opcode].needs_file_no_error) { + *out_file = file; + return 0; + } + return -EBADF; } static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, @@ -5583,7 +5541,8 @@ static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) again: linked_timeout = io_prep_linked_timeout(req); - if (req->work.creds && req->work.creds != current_cred()) { + if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && + req->work.creds != current_cred()) { if (old_creds) revert_creds(old_creds); if (old_creds == req->work.creds) @@ -5606,6 +5565,8 @@ again: goto exit; } punt: + io_req_init_async(req); + if (io_op_defs[req->opcode].file_table) { ret = io_grab_files(req); if (ret) @@ -5858,7 +5819,6 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, refcount_set(&req->refs, 2); req->task = NULL; req->result = 0; - INIT_IO_WORK(&req->work, io_wq_submit_work); if (unlikely(req->opcode >= IORING_OP_LAST)) return -EINVAL; @@ -5880,6 +5840,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, id = READ_ONCE(sqe->personality); if (id) { + io_req_init_async(req); req->work.creds = idr_find(&ctx->personality_idr, id); if (unlikely(!req->work.creds)) return -EINVAL; @@ -6874,6 +6835,7 @@ static int io_init_wq_offload(struct io_ring_ctx *ctx, data.user = ctx->user; data.free_work = io_free_work; + data.do_work = io_wq_submit_work; if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { /* Do QD, or 4 * CPUS, whatever is smallest */ @@ -7155,8 +7117,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, ret = 0; if (!pages || nr_pages > got_pages) { - kfree(vmas); - kfree(pages); + kvfree(vmas); + kvfree(pages); pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); vmas = kvmalloc_array(nr_pages, |