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authorPeng Tao <tao.peng@primarydata.com>2014-11-10 08:35:35 +0800
committerTom Haynes <loghyr@primarydata.com>2015-02-03 11:06:48 -0800
commit48d635f14a544c2b3ca870d2c7349b41160496d2 (patch)
tree3482ecc1445a13fb60941213930078da302869ff
parent47af81f29556a45493e5c87289c3c16ce911096c (diff)
nfs: add nfs_pgio_current_mirror helper
Let it return current nfs_pgio_mirror in use depending on pg_mirror_count. For read, we always use pg_mirrors[0], so this effectively gives us freedom to use pg_mirror_idx to track the actual mirror to read from through out the IO stack. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Tom Haynes <loghyr@primarydata.com>
-rw-r--r--fs/nfs/internal.h2
-rw-r--r--fs/nfs/objlayout/objio_osd.c2
-rw-r--r--fs/nfs/pagelist.c25
-rw-r--r--fs/nfs/pnfs.c9
4 files changed, 24 insertions, 14 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 5be06bcafa2f..ffe4b7ac9e6b 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -255,6 +255,8 @@ int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
const struct rpc_call_ops *call_ops, int how, int flags);
void nfs_free_request(struct nfs_page *req);
+struct nfs_pgio_mirror *
+nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
static inline void nfs_iocounter_init(struct nfs_io_counter *c)
{
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index 9a5f2ee6001f..24e1d7403c0b 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -537,7 +537,7 @@ int objio_write_pagelist(struct nfs_pgio_header *hdr, int how)
static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio,
struct nfs_page *prev, struct nfs_page *req)
{
- struct nfs_pgio_mirror *mirror = &pgio->pg_mirrors[pgio->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(pgio);
unsigned int size;
size = pnfs_generic_pg_test(pgio, prev, req);
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index f9d8c4691149..960c99f75d3f 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -42,11 +42,20 @@ static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
return p->pagevec != NULL;
}
+struct nfs_pgio_mirror *
+nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
+{
+ return nfs_pgio_has_mirroring(desc) ?
+ &desc->pg_mirrors[desc->pg_mirror_idx] :
+ &desc->pg_mirrors[0];
+}
+EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
+
void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr,
void (*release)(struct nfs_pgio_header *hdr))
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
hdr->req = nfs_list_entry(mirror->pg_list.next);
@@ -485,7 +494,7 @@ nfs_wait_on_request(struct nfs_page *req)
size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
struct nfs_page *prev, struct nfs_page *req)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (mirror->pg_count > mirror->pg_bsize) {
@@ -782,7 +791,7 @@ static void nfs_pgio_result(struct rpc_task *task, void *calldata)
int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_page *req;
struct page **pages,
@@ -831,7 +840,7 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
struct nfs_pgio_header *hdr;
int ret;
- mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ mirror = nfs_pgio_current_mirror(desc);
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
@@ -961,7 +970,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_page *prev = NULL;
@@ -985,7 +994,7 @@ static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
*/
static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!list_empty(&mirror->pg_list)) {
@@ -1015,7 +1024,7 @@ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_page *subreq;
unsigned int bytes_left = 0;
@@ -1078,7 +1087,7 @@ err_ptr:
static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
LIST_HEAD(head);
do {
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index e123cfce54ee..b822b1749643 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1731,7 +1731,7 @@ static void
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
@@ -1785,7 +1785,7 @@ EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;
@@ -1846,8 +1846,7 @@ static void
pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
-
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
list_splice_tail_init(&hdr->pages, &mirror->pg_list);
@@ -1903,7 +1902,7 @@ EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
- struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;