forked from rrcarlosr/Jetpack
365 lines
10 KiB
C
365 lines
10 KiB
C
/*
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* (C) 2001 Clemson University and The University of Chicago
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* (C) 2011 Omnibond Systems
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*
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* Changes by Acxiom Corporation to implement generic service_operation()
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* function, Copyright Acxiom Corporation, 2005.
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*
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* See COPYING in top-level directory.
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*/
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/*
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* In-kernel waitqueue operations.
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*/
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#include "protocol.h"
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#include "orangefs-kernel.h"
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#include "orangefs-bufmap.h"
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static int wait_for_matching_downcall(struct orangefs_kernel_op_s *, long, bool);
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static void orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *);
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/*
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* What we do in this function is to walk the list of operations that are
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* present in the request queue and mark them as purged.
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* NOTE: This is called from the device close after client-core has
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* guaranteed that no new operations could appear on the list since the
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* client-core is anyway going to exit.
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*/
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void purge_waiting_ops(void)
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{
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struct orangefs_kernel_op_s *op, *tmp;
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spin_lock(&orangefs_request_list_lock);
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list_for_each_entry_safe(op, tmp, &orangefs_request_list, list) {
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"pvfs2-client-core: purging op tag %llu %s\n",
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llu(op->tag),
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get_opname_string(op));
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set_op_state_purged(op);
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: op:%s: op_state:%d: process:%s:\n",
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__func__,
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get_opname_string(op),
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op->op_state,
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current->comm);
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}
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spin_unlock(&orangefs_request_list_lock);
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}
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/*
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* submits a ORANGEFS operation and waits for it to complete
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*
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* Note op->downcall.status will contain the status of the operation (in
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* errno format), whether provided by pvfs2-client or a result of failure to
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* service the operation. If the caller wishes to distinguish, then
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* op->state can be checked to see if it was serviced or not.
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*
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* Returns contents of op->downcall.status for convenience
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*/
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int service_operation(struct orangefs_kernel_op_s *op,
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const char *op_name,
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int flags)
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{
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long timeout = MAX_SCHEDULE_TIMEOUT;
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int ret = 0;
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DEFINE_WAIT(wait_entry);
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op->upcall.tgid = current->tgid;
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op->upcall.pid = current->pid;
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retry_servicing:
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op->downcall.status = 0;
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: %s op:%p: process:%s: pid:%d:\n",
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__func__,
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op_name,
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op,
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current->comm,
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current->pid);
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/*
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* If ORANGEFS_OP_NO_MUTEX was set in flags, we need to avoid
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* acquiring the request_mutex because we're servicing a
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* high priority remount operation and the request_mutex is
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* already taken.
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*/
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if (!(flags & ORANGEFS_OP_NO_MUTEX)) {
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if (flags & ORANGEFS_OP_INTERRUPTIBLE)
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ret = mutex_lock_interruptible(&orangefs_request_mutex);
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else
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ret = mutex_lock_killable(&orangefs_request_mutex);
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/*
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* check to see if we were interrupted while waiting for
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* mutex
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*/
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if (ret < 0) {
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op->downcall.status = ret;
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: service_operation interrupted.\n",
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__func__);
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return ret;
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}
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}
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/* queue up the operation */
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spin_lock(&orangefs_request_list_lock);
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spin_lock(&op->lock);
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set_op_state_waiting(op);
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: op:%s: op_state:%d: process:%s:\n",
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__func__,
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get_opname_string(op),
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op->op_state,
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current->comm);
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/* add high priority remount op to the front of the line. */
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if (flags & ORANGEFS_OP_PRIORITY)
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list_add(&op->list, &orangefs_request_list);
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else
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list_add_tail(&op->list, &orangefs_request_list);
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spin_unlock(&op->lock);
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wake_up_interruptible(&orangefs_request_list_waitq);
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if (!__is_daemon_in_service()) {
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s:client core is NOT in service.\n",
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__func__);
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/*
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* Don't wait for the userspace component to return if
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* the filesystem is being umounted anyway.
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*/
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if (op->upcall.type == ORANGEFS_VFS_OP_FS_UMOUNT)
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timeout = 0;
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else
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timeout = op_timeout_secs * HZ;
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}
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spin_unlock(&orangefs_request_list_lock);
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if (!(flags & ORANGEFS_OP_NO_MUTEX))
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mutex_unlock(&orangefs_request_mutex);
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ret = wait_for_matching_downcall(op, timeout,
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flags & ORANGEFS_OP_INTERRUPTIBLE);
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: wait_for_matching_downcall returned %d for %p\n",
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__func__,
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ret,
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op);
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/* got matching downcall; make sure status is in errno format */
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if (!ret) {
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spin_unlock(&op->lock);
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op->downcall.status =
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orangefs_normalize_to_errno(op->downcall.status);
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ret = op->downcall.status;
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goto out;
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}
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/* failed to get matching downcall */
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if (ret == -ETIMEDOUT) {
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gossip_err("%s: %s -- wait timed out; aborting attempt.\n",
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__func__,
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op_name);
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}
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/*
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* remove a waiting op from the request list or
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* remove an in-progress op from the in-progress list.
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*/
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orangefs_clean_up_interrupted_operation(op);
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op->downcall.status = ret;
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/* retry if operation has not been serviced and if requested */
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if (ret == -EAGAIN) {
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op->attempts++;
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timeout = op_timeout_secs * HZ;
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"orangefs: tag %llu (%s)"
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" -- operation to be retried (%d attempt)\n",
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llu(op->tag),
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op_name,
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op->attempts);
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/*
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* io ops (ops that use the shared memory buffer) have
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* to be returned to their caller for a retry. Other ops
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* can just be recycled here.
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*/
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if (!op->uses_shared_memory)
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goto retry_servicing;
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}
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out:
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: %s returning: %d for %p.\n",
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__func__,
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op_name,
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ret,
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op);
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return ret;
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}
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/* This can get called on an I/O op if it had a bad service_operation. */
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bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op)
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{
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u64 tag = op->tag;
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if (!op_state_in_progress(op))
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return false;
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op->slot_to_free = op->upcall.req.io.buf_index;
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memset(&op->upcall, 0, sizeof(op->upcall));
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memset(&op->downcall, 0, sizeof(op->downcall));
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op->upcall.type = ORANGEFS_VFS_OP_CANCEL;
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op->upcall.req.cancel.op_tag = tag;
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op->downcall.type = ORANGEFS_VFS_OP_INVALID;
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op->downcall.status = -1;
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orangefs_new_tag(op);
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spin_lock(&orangefs_request_list_lock);
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/* orangefs_request_list_lock is enough of a barrier here */
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if (!__is_daemon_in_service()) {
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spin_unlock(&orangefs_request_list_lock);
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return false;
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}
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spin_lock(&op->lock);
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set_op_state_waiting(op);
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: op:%s: op_state:%d: process:%s:\n",
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__func__,
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get_opname_string(op),
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op->op_state,
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current->comm);
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list_add(&op->list, &orangefs_request_list);
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spin_unlock(&op->lock);
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spin_unlock(&orangefs_request_list_lock);
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"Attempting ORANGEFS operation cancellation of tag %llu\n",
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llu(tag));
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return true;
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}
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/*
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* Change an op to the "given up" state and remove it from its list.
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*/
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static void
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orangefs_clean_up_interrupted_operation(struct orangefs_kernel_op_s *op)
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{
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/*
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* handle interrupted cases depending on what state we were in when
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* the interruption is detected.
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*
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* Called with op->lock held.
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*/
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/*
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* List manipulation code elsewhere will ignore ops that
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* have been given up upon.
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*/
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op->op_state |= OP_VFS_STATE_GIVEN_UP;
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if (list_empty(&op->list)) {
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/* caught copying to/from daemon */
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BUG_ON(op_state_serviced(op));
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spin_unlock(&op->lock);
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wait_for_completion(&op->waitq);
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} else if (op_state_waiting(op)) {
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/*
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* upcall hasn't been read; remove op from upcall request
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* list.
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*/
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spin_unlock(&op->lock);
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spin_lock(&orangefs_request_list_lock);
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list_del_init(&op->list);
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spin_unlock(&orangefs_request_list_lock);
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"Interrupted: Removed op %p from request_list\n",
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op);
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} else if (op_state_in_progress(op)) {
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/* op must be removed from the in progress htable */
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spin_unlock(&op->lock);
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spin_lock(&orangefs_htable_ops_in_progress_lock);
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list_del_init(&op->list);
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spin_unlock(&orangefs_htable_ops_in_progress_lock);
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"Interrupted: Removed op %p"
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" from htable_ops_in_progress\n",
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op);
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} else {
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spin_unlock(&op->lock);
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gossip_err("interrupted operation is in a weird state 0x%x\n",
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op->op_state);
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}
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reinit_completion(&op->waitq);
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}
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/*
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* Sleeps on waitqueue waiting for matching downcall.
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* If client-core finishes servicing, then we are good to go.
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* else if client-core exits, we get woken up here, and retry with a timeout
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*
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* When this call returns to the caller, the specified op will no
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* longer be in either the in_progress hash table or on the request list.
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*
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* Returns 0 on success and -errno on failure
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* Errors are:
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* EAGAIN in case we want the caller to requeue and try again..
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* EINTR/EIO/ETIMEDOUT indicating we are done trying to service this
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* operation since client-core seems to be exiting too often
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* or if we were interrupted.
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*
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* Returns with op->lock taken.
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*/
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static int wait_for_matching_downcall(struct orangefs_kernel_op_s *op,
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long timeout,
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bool interruptible)
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{
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long n;
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/*
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* There's a "schedule_timeout" inside of these wait
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* primitives, during which the op is out of the hands of the
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* user process that needs something done and is being
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* manipulated by the client-core process.
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*/
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if (interruptible)
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n = wait_for_completion_interruptible_timeout(&op->waitq,
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timeout);
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else
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n = wait_for_completion_killable_timeout(&op->waitq, timeout);
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spin_lock(&op->lock);
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if (op_state_serviced(op))
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return 0;
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if (unlikely(n < 0)) {
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: operation interrupted, tag %llu, %p\n",
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__func__,
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llu(op->tag),
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op);
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return -EINTR;
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}
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if (op_state_purged(op)) {
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: operation purged, tag %llu, %p, %d\n",
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__func__,
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llu(op->tag),
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op,
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op->attempts);
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return (op->attempts < ORANGEFS_PURGE_RETRY_COUNT) ?
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-EAGAIN :
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-EIO;
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}
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/* must have timed out, then... */
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gossip_debug(GOSSIP_WAIT_DEBUG,
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"%s: operation timed out, tag %llu, %p, %d)\n",
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__func__,
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llu(op->tag),
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op,
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op->attempts);
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return -ETIMEDOUT;
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}
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