diff options
99 files changed, 849 insertions, 595 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 15853d522941..2c391338c675 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -440,7 +440,9 @@ prototypes: ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); int (*iterate_shared) (struct file *, struct dir_context *); - unsigned int (*poll) (struct file *, struct poll_table_struct *); + __poll_t (*poll) (struct file *, struct poll_table_struct *); + struct wait_queue_head * (*get_poll_head)(struct file *, __poll_t); + __poll_t (*poll_mask) (struct file *, __poll_t); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); long (*compat_ioctl) (struct file *, unsigned int, unsigned long); int (*mmap) (struct file *, struct vm_area_struct *); @@ -471,7 +473,7 @@ prototypes: }; locking rules: - All may block. + All except for ->poll_mask may block. ->llseek() locking has moved from llseek to the individual llseek implementations. If your fs is not using generic_file_llseek, you @@ -503,6 +505,9 @@ in sys_read() and friends. the lease within the individual filesystem to record the result of the operation +->poll_mask can be called with or without the waitqueue lock for the waitqueue +returned from ->get_poll_head. + --------------------------- dquot_operations ------------------------------- prototypes: int (*write_dquot) (struct dquot *); diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 5fd325df59e2..829a7b7857a4 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -856,7 +856,9 @@ struct file_operations { ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); - unsigned int (*poll) (struct file *, struct poll_table_struct *); + __poll_t (*poll) (struct file *, struct poll_table_struct *); + struct wait_queue_head * (*get_poll_head)(struct file *, __poll_t); + __poll_t (*poll_mask) (struct file *, __poll_t); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); long (*compat_ioctl) (struct file *, unsigned int, unsigned long); int (*mmap) (struct file *, struct vm_area_struct *); @@ -901,6 +903,17 @@ otherwise noted. activity on this file and (optionally) go to sleep until there is activity. Called by the select(2) and poll(2) system calls + get_poll_head: Returns the struct wait_queue_head that callers can + wait on. Callers need to check the returned events using ->poll_mask + once woken. Can return NULL to indicate polling is not supported, + or any error code using the ERR_PTR convention to indicate that a + grave error occured and ->poll_mask shall not be called. + + poll_mask: return the mask of EPOLL* values describing the file descriptor + state. Called either before going to sleep on the waitqueue returned by + get_poll_head, or after it has been woken. If ->get_poll_head and + ->poll_mask are implemented ->poll does not need to be implement. + unlocked_ioctl: called by the ioctl(2) system call. compat_ioctl: called by the ioctl(2) system call when 32 bit system calls diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index d6b27dab1b30..14a2f996e543 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -396,3 +396,4 @@ 382 i386 pkey_free sys_pkey_free __ia32_sys_pkey_free 383 i386 statx sys_statx __ia32_sys_statx 384 i386 arch_prctl sys_arch_prctl __ia32_compat_sys_arch_prctl +385 i386 io_pgetevents sys_io_pgetevents __ia32_compat_sys_io_pgetevents diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 4dfe42666d0c..cd36232ab62f 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -341,6 +341,7 @@ 330 common pkey_alloc __x64_sys_pkey_alloc 331 common pkey_free __x64_sys_pkey_free 332 common statx __x64_sys_statx +333 common io_pgetevents __x64_sys_io_pgetevents # # x32-specific system call numbers start at 512 to avoid cache impact diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 7846c0c20cfe..89ed613c017e 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -347,7 +347,6 @@ static const struct proto_ops alg_proto_ops = { .sendpage = sock_no_sendpage, .sendmsg = sock_no_sendmsg, .recvmsg = sock_no_recvmsg, - .poll = sock_no_poll, .bind = alg_bind, .release = af_alg_release, @@ -1061,19 +1060,12 @@ void af_alg_async_cb(struct crypto_async_request *_req, int err) } EXPORT_SYMBOL_GPL(af_alg_async_cb); -/** - * af_alg_poll - poll system call handler - */ -__poll_t af_alg_poll(struct file *file, struct socket *sock, - poll_table *wait) +__poll_t af_alg_poll_mask(struct socket *sock, __poll_t events) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct af_alg_ctx *ctx = ask->private; - __poll_t mask; - - sock_poll_wait(file, sk_sleep(sk), wait); - mask = 0; + __poll_t mask = 0; if (!ctx->more || ctx->used) mask |= EPOLLIN | EPOLLRDNORM; @@ -1083,7 +1075,7 @@ __poll_t af_alg_poll(struct file *file, struct socket *sock, return mask; } -EXPORT_SYMBOL_GPL(af_alg_poll); +EXPORT_SYMBOL_GPL(af_alg_poll_mask); /** * af_alg_alloc_areq - allocate struct af_alg_async_req diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c index 4b07edd5a9ff..330cf9f2b767 100644 --- a/crypto/algif_aead.c +++ b/crypto/algif_aead.c @@ -375,7 +375,7 @@ static struct proto_ops algif_aead_ops = { .sendmsg = aead_sendmsg, .sendpage = af_alg_sendpage, .recvmsg = aead_recvmsg, - .poll = af_alg_poll, + .poll_mask = af_alg_poll_mask, }; static int aead_check_key(struct socket *sock) @@ -471,7 +471,7 @@ static struct proto_ops algif_aead_ops_nokey = { .sendmsg = aead_sendmsg_nokey, .sendpage = aead_sendpage_nokey, .recvmsg = aead_recvmsg_nokey, - .poll = af_alg_poll, + .poll_mask = af_alg_poll_mask, }; static void *aead_bind(const char *name, u32 type, u32 mask) diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index 6c9b1927a520..bfcf595fd8f9 100644 --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -288,7 +288,6 @@ static struct proto_ops algif_hash_ops = { .mmap = sock_no_mmap, .bind = sock_no_bind, .setsockopt = sock_no_setsockopt, - .poll = sock_no_poll, .release = af_alg_release, .sendmsg = hash_sendmsg, @@ -396,7 +395,6 @@ static struct proto_ops algif_hash_ops_nokey = { .mmap = sock_no_mmap, .bind = sock_no_bind, .setsockopt = sock_no_setsockopt, - .poll = sock_no_poll, .release = af_alg_release, .sendmsg = hash_sendmsg_nokey, diff --git a/crypto/algif_rng.c b/crypto/algif_rng.c index 150c2b6480ed..22df3799a17b 100644 --- a/crypto/algif_rng.c +++ b/crypto/algif_rng.c @@ -106,7 +106,6 @@ static struct proto_ops algif_rng_ops = { .bind = sock_no_bind, .accept = sock_no_accept, .setsockopt = sock_no_setsockopt, - .poll = sock_no_poll, .sendmsg = sock_no_sendmsg, .sendpage = sock_no_sendpage, diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index c4e885df4564..15cf3c5222e0 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -205,7 +205,7 @@ static struct proto_ops algif_skcipher_ops = { .sendmsg = skcipher_sendmsg, .sendpage = af_alg_sendpage, .recvmsg = skcipher_recvmsg, - .poll = af_alg_poll, + .poll_mask = af_alg_poll_mask, }; static int skcipher_check_key(struct socket *sock) @@ -301,7 +301,7 @@ static struct proto_ops algif_skcipher_ops_nokey = { .sendmsg = skcipher_sendmsg_nokey, .sendpage = skcipher_sendpage_nokey, .recvmsg = skcipher_recvmsg_nokey, - .poll = af_alg_poll, + .poll_mask = af_alg_poll_mask, }; static void *skcipher_bind(const char *name, u32 type, u32 mask) diff --git a/drivers/char/random.c b/drivers/char/random.c index cd888d4ee605..a8fb0020ba5c 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -402,8 +402,7 @@ static struct poolinfo { /* * Static global variables */ -static DECLARE_WAIT_QUEUE_HEAD(random_read_wait); -static DECLARE_WAIT_QUEUE_HEAD(random_write_wait); +static DECLARE_WAIT_QUEUE_HEAD(random_wait); static struct fasync_struct *fasync; static DEFINE_SPINLOCK(random_ready_list_lock); @@ -722,8 +721,8 @@ retry: /* should we wake readers? */ if (entropy_bits >= random_read_wakeup_bits && - wq_has_sleeper(&random_read_wait)) { - wake_up_interruptible(&random_read_wait); + wq_has_sleeper(&random_wait)) { + wake_up_interruptible_poll(&random_wait, POLLIN); kill_fasync(&fasync, SIGIO, POLL_IN); } /* If the input pool is getting full, send some @@ -1397,7 +1396,7 @@ retry: trace_debit_entropy(r->name, 8 * ibytes); if (ibytes && (r->entropy_count >> ENTROPY_SHIFT) < random_write_wakeup_bits) { - wake_up_interruptible(&random_write_wait); + wake_up_interruptible_poll(&random_wait, POLLOUT); kill_fasync(&fasync, SIGIO, POLL_OUT); } @@ -1839,7 +1838,7 @@ _random_read(int nonblock, char __user *buf, size_t nbytes) if (nonblock) return -EAGAIN; - wait_event_interruptible(random_read_wait, + wait_event_interruptible(random_wait, ENTROPY_BITS(&input_pool) >= random_read_wakeup_bits); if (signal_pending(current)) @@ -1876,14 +1875,17 @@ urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) return ret; } +static struct wait_queue_head * +random_get_poll_head(struct file *file, __poll_t events) +{ + return &random_wait; +} + static __poll_t -random_poll(struct file *file, poll_table * wait) +random_poll_mask(struct file *file, __poll_t events) { - __poll_t mask; + __poll_t mask = 0; - poll_wait(file, &random_read_wait, wait); - poll_wait(file, &random_write_wait, wait); - mask = 0; if (ENTROPY_BITS(&input_pool) >= random_read_wakeup_bits) mask |= EPOLLIN | EPOLLRDNORM; if (ENTROPY_BITS(&input_pool) < random_write_wakeup_bits) @@ -1990,7 +1992,8 @@ static int random_fasync(int fd, struct file *filp, int on) const struct file_operations random_fops = { .read = random_read, .write = random_write, - .poll = random_poll, + .get_poll_head = random_get_poll_head, + .poll_mask = random_poll_mask, .unlocked_ioctl = random_ioctl, .fasync = random_fasync, .llseek = noop_llseek, @@ -2323,7 +2326,7 @@ void add_hwgenerator_randomness(const char *buffer, size_t count, * We'll be woken up again once below random_write_wakeup_thresh, * or when the calling thread is about to terminate. */ - wait_event_interruptible(random_write_wait, kthread_should_stop() || + wait_event_interruptible(random_wait, kthread_should_stop() || ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits); mix_pool_bytes(poolp, buffer, count); credit_entropy_bits(poolp, entropy); diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c index 1f8f489b4167..98f90aadd141 100644 --- a/drivers/isdn/mISDN/socket.c +++ b/drivers/isdn/mISDN/socket.c @@ -588,7 +588,7 @@ static const struct proto_ops data_sock_ops = { .getname = data_sock_getname, .sendmsg = mISDN_sock_sendmsg, .recvmsg = mISDN_sock_recvmsg, - .poll = datagram_poll, + .poll_mask = datagram_poll_mask, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = data_sock_setsockopt, @@ -745,7 +745,6 @@ static const struct proto_ops base_sock_ops = { .getname = sock_no_getname, .sendmsg = sock_no_sendmsg, .recvmsg = sock_no_recvmsg, - .poll = sock_no_poll, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = sock_no_setsockopt, diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c index ce61231e96ea..de51e8f70f44 100644 --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -1107,7 +1107,7 @@ static const struct proto_ops pppoe_ops = { .socketpair = sock_no_socketpair, .accept = sock_no_accept, .getname = pppoe_getname, - .poll = datagram_poll, + .poll_mask = datagram_poll_mask, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = sock_no_setsockopt, diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c index c4267ecefd85..157b67c1bf8e 100644 --- a/drivers/net/ppp/pptp.c +++ b/drivers/net/ppp/pptp.c @@ -624,7 +624,6 @@ static const struct proto_ops pptp_ops = { .socketpair = sock_no_socketpair, .accept = sock_no_accept, .getname = pptp_getname, - .poll |