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Diffstat (limited to 'fs/nfs/direct.c')
-rw-r--r--fs/nfs/direct.c94
1 files changed, 55 insertions, 39 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 89c03a507dd9..9cdac9945483 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -122,32 +122,49 @@ static inline int put_dreq(struct nfs_direct_req *dreq)
}
static void
-nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
+nfs_direct_handle_truncated(struct nfs_direct_req *dreq,
+ const struct nfs_pgio_header *hdr,
+ ssize_t dreq_len)
{
- int i;
- ssize_t count;
+ 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;
+ if (dreq->max_count >= dreq_len) {
+ dreq->max_count = dreq_len;
+ if (dreq->count > dreq_len)
+ dreq->count = dreq_len;
+
+ if (test_bit(NFS_IOHDR_ERROR, &hdr->flags))
+ dreq->error = hdr->error;
+ 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;
- WARN_ON_ONCE(dreq->count >= dreq->max_count);
+ if (hdr_end > dreq->io_start)
+ dreq_len = hdr_end - dreq->io_start;
- if (dreq->mirror_count == 1) {
- dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
- dreq->count += hdr->good_bytes;
- } else {
- /* mirrored writes */
- count = dreq->mirrors[hdr->pgio_mirror_idx].count;
- if (count + dreq->io_start < hdr->io_start + hdr->good_bytes) {
- count = hdr->io_start + hdr->good_bytes - dreq->io_start;
- dreq->mirrors[hdr->pgio_mirror_idx].count = count;
- }
- /* update the dreq->count by finding the minimum agreed count from all
- * mirrors */
- count = dreq->mirrors[0].count;
+ nfs_direct_handle_truncated(dreq, hdr, dreq_len);
- for (i = 1; i < dreq->mirror_count; i++)
- count = min(count, dreq->mirrors[i].count);
+ if (dreq_len > dreq->max_count)
+ dreq_len = dreq->max_count;
- dreq->count = count;
- }
+ if (mirror->count < dreq_len)
+ mirror->count = dreq_len;
+ if (dreq->count < dreq_len)
+ dreq->count = dreq_len;
}
/*
@@ -400,15 +417,13 @@ static void nfs_direct_read_completion(struct nfs_pgio_header *hdr)
unsigned long bytes = 0;
struct nfs_direct_req *dreq = hdr->dreq;
- if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
- goto out_put;
-
spin_lock(&dreq->lock);
- if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && (hdr->good_bytes == 0))
- dreq->error = hdr->error;
- else
- nfs_direct_good_bytes(dreq, hdr);
+ if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+ spin_unlock(&dreq->lock);
+ goto out_put;
+ }
+ nfs_direct_count_bytes(dreq, hdr);
spin_unlock(&dreq->lock);
while (!list_empty(&hdr->pages)) {
@@ -428,7 +443,7 @@ out_put:
hdr->release(hdr);
}
-static void nfs_read_sync_pgio_error(struct list_head *head)
+static void nfs_read_sync_pgio_error(struct list_head *head, int error)
{
struct nfs_page *req;
@@ -645,6 +660,9 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
nfs_direct_write_scan_commit_list(dreq->inode, &reqs, &cinfo);
dreq->count = 0;
+ dreq->max_count = 0;
+ list_for_each_entry(req, &reqs, wb_list)
+ 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++)
@@ -664,8 +682,7 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
list_for_each_entry_safe(req, tmp, &reqs, wb_list) {
if (!nfs_pageio_add_request(&desc, req)) {
- nfs_list_remove_request(req);
- nfs_list_add_request(req, &failed);
+ nfs_list_move_request(req, &failed);
spin_lock(&cinfo.inode->i_lock);
dreq->flags = 0;
if (desc.pg_error < 0)
@@ -775,17 +792,16 @@ static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
bool request_commit = false;
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
- if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
- goto out_put;
-
nfs_init_cinfo_from_dreq(&cinfo, dreq);
spin_lock(&dreq->lock);
+ if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+ spin_unlock(&dreq->lock);
+ goto out_put;
+ }
- if (test_bit(NFS_IOHDR_ERROR, &hdr->flags))
- dreq->error = hdr->error;
- if (dreq->error == 0) {
- nfs_direct_good_bytes(dreq, hdr);
+ nfs_direct_count_bytes(dreq, hdr);
+ if (hdr->good_bytes != 0) {
if (nfs_write_need_commit(hdr)) {
if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES)
request_commit = true;
@@ -821,7 +837,7 @@ out_put:
hdr->release(hdr);
}
-static void nfs_write_sync_pgio_error(struct list_head *head)
+static void nfs_write_sync_pgio_error(struct list_head *head, int error)
{
struct nfs_page *req;