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NFS: Separate functions for counting outstanding NFS direct I/Os 

Factor out the logic that increments and decrements the outstanding I/O
count.  This will be a commonly used bit of code in upcoming patches.
Also make this an atomic_t again, since it will be very often manipulated
outside dreq->spin lock.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2006-06-20 12:55:19 -04:00 committed by Trond Myklebust
parent 816724e65c
commit b1c5921c5b
1 changed files with 20 additions and 19 deletions
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39
fs/nfs/direct.c
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@ -80,8 +80,8 @@ struct nfs_direct_req {
unsigned int npages; /* count of pages */
/* completion state */
atomic_t io_count; /* i/os we're waiting for */
spinlock_t lock; /* protect completion state */
int outstanding; /* i/os we're waiting for */
ssize_t count, /* bytes actually processed */
error; /* any reported error */
struct completion completion; /* wait for i/o completion */
@ -97,6 +97,16 @@ struct nfs_direct_req {
static void nfs_direct_write_schedule(struct nfs_direct_req *dreq, int sync);
static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode);
static inline void get_dreq(struct nfs_direct_req *dreq)
{
atomic_inc(&dreq->io_count);
}
static inline int put_dreq(struct nfs_direct_req *dreq)
{
return atomic_dec_and_test(&dreq->io_count);
}
/**
* nfs_direct_IO - NFS address space operation for direct I/O
* @rw: direction (read or write)
@ -180,7 +190,7 @@ static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
dreq->iocb = NULL;
dreq->ctx = NULL;
spin_lock_init(&dreq->lock);
dreq->outstanding = 0;
atomic_set(&dreq->io_count, 0);
dreq->count = 0;
dreq->error = 0;
dreq->flags = 0;
@ -278,7 +288,7 @@ static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, size_t rsize)
list_add(&data->pages, list);
data->req = (struct nfs_page *) dreq;
dreq->outstanding++;
get_dreq(dreq);
if (nbytes <= rsize)
break;
nbytes -= rsize;
@ -302,13 +312,10 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
else
dreq->error = task->tk_status;
if (--dreq->outstanding) {
spin_unlock(&dreq->lock);
return;
}
spin_unlock(&dreq->lock);
nfs_direct_complete(dreq);
if (put_dreq(dreq))
nfs_direct_complete(dreq);
}
static const struct rpc_call_ops nfs_read_direct_ops = {
@ -432,7 +439,7 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
list_splice_init(&dreq->rewrite_list, &dreq->list);
list_for_each(pos, &dreq->list)
dreq->outstanding++;
get_dreq(dreq);
dreq->count = 0;
nfs_direct_write_schedule(dreq, FLUSH_STABLE);
@ -564,7 +571,7 @@ static struct nfs_direct_req *nfs_direct_write_alloc(size_t nbytes, size_t wsize
list_add(&data->pages, list);
data->req = (struct nfs_page *) dreq;
dreq->outstanding++;
get_dreq(dreq);
if (nbytes <= wsize)
break;
nbytes -= wsize;
@ -620,14 +627,8 @@ static void nfs_direct_write_release(void *calldata)
struct nfs_write_data *data = calldata;
struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
spin_lock(&dreq->lock);
if (--dreq->outstanding) {
spin_unlock(&dreq->lock);
return;
}
spin_unlock(&dreq->lock);
nfs_direct_write_complete(dreq, data->inode);
if (put_dreq(dreq))
nfs_direct_write_complete(dreq, data->inode);
}
static const struct rpc_call_ops nfs_write_direct_ops = {