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NFS: Remove redundant mirror tracking in O_DIRECT 

We no longer need the extra mirror length tracking in the O_DIRECT code,
as we are able to track the maximum contiguous length in dreq->max_count.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-09-30 14:02:57 -04:00 committed by Anna Schumaker
parent 031d73ed76
commit 0b57484779
1 changed files with 0 additions and 42 deletions
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42
fs/nfs/direct.c
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@ -64,13 +64,6 @@
static struct kmem_cache *nfs_direct_cachep;
/*
* This represents a set of asynchronous requests that we're waiting on
*/
struct nfs_direct_mirror {
ssize_t count;
};
struct nfs_direct_req {
struct kref kref; /* release manager */
@ -84,9 +77,6 @@ struct nfs_direct_req {
atomic_t io_count; /* i/os we're waiting for */
spinlock_t lock; /* protect completion state */
struct nfs_direct_mirror mirrors[NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX];
int mirror_count;
loff_t io_start; /* Start offset for I/O */
ssize_t count, /* bytes actually processed */
max_count, /* max expected count */
@ -127,8 +117,6 @@ nfs_direct_handle_truncated(struct nfs_direct_req *dreq,
const struct nfs_pgio_header *hdr,
ssize_t dreq_len)
{
struct nfs_direct_mirror *mirror = &dreq->mirrors[hdr->pgio_mirror_idx];
if (!(test_bit(NFS_IOHDR_ERROR, &hdr->flags) ||
test_bit(NFS_IOHDR_EOF, &hdr->flags)))
return;
@ -142,15 +130,12 @@ nfs_direct_handle_truncated(struct nfs_direct_req *dreq,
else /* Clear outstanding error if this is EOF */
dreq->error = 0;
}
if (mirror->count > dreq_len)
mirror->count = dreq_len;
}
static void
nfs_direct_count_bytes(struct nfs_direct_req *dreq,
const struct nfs_pgio_header *hdr)
{
struct nfs_direct_mirror *mirror = &dreq->mirrors[hdr->pgio_mirror_idx];
loff_t hdr_end = hdr->io_start + hdr->good_bytes;
ssize_t dreq_len = 0;
@ -162,8 +147,6 @@ nfs_direct_count_bytes(struct nfs_direct_req *dreq,
if (dreq_len > dreq->max_count)
dreq_len = dreq->max_count;
if (mirror->count < dreq_len)
mirror->count = dreq_len;
if (dreq->count < dreq_len)
dreq->count = dreq_len;
}
@ -310,18 +293,6 @@ void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
cinfo->completion_ops = &nfs_direct_commit_completion_ops;
}
static inline void nfs_direct_setup_mirroring(struct nfs_direct_req *dreq,
struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
int mirror_count = 1;
if (pgio->pg_ops->pg_get_mirror_count)
mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
dreq->mirror_count = mirror_count;
}
static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
{
struct nfs_direct_req *dreq;
@ -336,7 +307,6 @@ static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
INIT_LIST_HEAD(&dreq->mds_cinfo.list);
dreq->verf.committed = NFS_INVALID_STABLE_HOW; /* not set yet */
INIT_WORK(&dreq->work, nfs_direct_write_schedule_work);
dreq->mirror_count = 1;
spin_lock_init(&dreq->lock);
return dreq;
@ -655,7 +625,6 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
LIST_HEAD(reqs);
struct nfs_commit_info cinfo;
LIST_HEAD(failed);
int i;
nfs_init_cinfo_from_dreq(&cinfo, dreq);
nfs_direct_write_scan_commit_list(dreq->inode, &reqs, &cinfo);
@ -666,21 +635,12 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
dreq->max_count += req->wb_bytes;
dreq->verf.committed = NFS_INVALID_STABLE_HOW;
nfs_clear_pnfs_ds_commit_verifiers(&dreq->ds_cinfo);
for (i = 0; i < dreq->mirror_count; i++)
dreq->mirrors[i].count = 0;
get_dreq(dreq);
nfs_pageio_init_write(&desc, dreq->inode, FLUSH_STABLE, false,
&nfs_direct_write_completion_ops);
desc.pg_dreq = dreq;
req = nfs_list_entry(reqs.next);
nfs_direct_setup_mirroring(dreq, &desc, req);
if (desc.pg_error < 0) {
list_splice_init(&reqs, &failed);
goto out_failed;
}
list_for_each_entry_safe(req, tmp, &reqs, wb_list) {
/* Bump the transmission count */
req->wb_nio++;
@ -698,7 +658,6 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
}
nfs_pageio_complete(&desc);
out_failed:
while (!list_empty(&failed)) {
req = nfs_list_entry(failed.next);
nfs_list_remove_request(req);
@ -931,7 +890,6 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
break;
}
nfs_direct_setup_mirroring(dreq, &desc, req);
if (desc.pg_error < 0) {
nfs_free_request(req);
result = desc.pg_error;