* [PATCH-v2 1/3] pnfsblock: bail out partial block direct write
2012-05-29 4:38 [PATCH-v2 0/3] pnfsblock: cope with DIO changes Peng Tao
@ 2012-05-29 4:38 ` Peng Tao
2012-05-31 21:13 ` Myklebust, Trond
2012-05-29 4:38 ` [PATCH-v2 2/3] NFS41: add pg_layout_private and moreio fields Peng Tao
2012-05-29 4:38 ` [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO Peng Tao
2 siblings, 1 reply; 7+ messages in thread
From: Peng Tao @ 2012-05-29 4:38 UTC (permalink / raw)
To: Trond.Myklebust; +Cc: linux-nfs, bharrosh, Peng Tao
Signed-off-by: Peng Tao <tao.peng@emc.com>
---
fs/nfs/blocklayout/blocklayout.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index dd392ed..bab432f 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -572,10 +572,13 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
u64 temp;
int npg_per_block =
NFS_SERVER(header->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT;
+ unsigned long blkmask = PAGE_CACHE_MASK;
dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
/* Check for alignment first */
- if (!bl_check_alignment(offset, count, PAGE_CACHE_MASK))
+ if (header->dreq)
+ blkmask = NFS_SERVER(header->inode)->pnfs_blksize - 1;
+ if (!bl_check_alignment(offset, count, blkmask))
goto out_mds;
/* At this point, wdata->pages is a (sequential) list of nfs_pages.
@@ -1023,7 +1026,15 @@ bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
static void
bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
- if (!bl_check_alignment(req->wb_offset, req->wb_bytes, PAGE_CACHE_MASK))
+ if (pgio->pg_dreq) {
+ /* Direct write should be blksize aligned */
+ unsigned blkmask = NFS_SERVER(pgio->pg_inode)->pnfs_blksize - 1;
+ u64 pos = (req->wb_index << PAGE_CACHE_SHIFT) + req->wb_bytes;
+ if (!bl_check_alignment(pos, 0, blkmask) ||
+ req->wb_bytes != PAGE_CACHE_SIZE)
+ nfs_pageio_reset_write_mds(pgio);
+ } else if (!bl_check_alignment(req->wb_offset, req->wb_bytes,
+ PAGE_CACHE_MASK))
nfs_pageio_reset_write_mds(pgio);
else
pnfs_generic_pg_init_write(pgio, req);
--
1.7.1.262.g5ef3d
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH-v2 1/3] pnfsblock: bail out partial block direct write
2012-05-29 4:38 ` [PATCH-v2 1/3] pnfsblock: bail out partial block direct write Peng Tao
@ 2012-05-31 21:13 ` Myklebust, Trond
0 siblings, 0 replies; 7+ messages in thread
From: Myklebust, Trond @ 2012-05-31 21:13 UTC (permalink / raw)
To: Peng Tao; +Cc: linux-nfs@vger.kernel.org, bharrosh@panasas.com, Peng Tao
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cC5jb20NCg0K
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH-v2 2/3] NFS41: add pg_layout_private and moreio fields
2012-05-29 4:38 [PATCH-v2 0/3] pnfsblock: cope with DIO changes Peng Tao
2012-05-29 4:38 ` [PATCH-v2 1/3] pnfsblock: bail out partial block direct write Peng Tao
@ 2012-05-29 4:38 ` Peng Tao
2012-05-29 4:38 ` [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO Peng Tao
2 siblings, 0 replies; 7+ messages in thread
From: Peng Tao @ 2012-05-29 4:38 UTC (permalink / raw)
To: Trond.Myklebust; +Cc: linux-nfs, bharrosh, Peng Tao
To allow layout driver to pass private information around
pg_init/pg_doio.
Cc: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
---
fs/nfs/pagelist.c | 3 +++
include/linux/nfs_page.h | 1 +
include/linux/nfs_xdr.h | 2 ++
3 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index aed913c..a47d18a 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -49,6 +49,8 @@ void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
hdr->io_start = req_offset(hdr->req);
hdr->good_bytes = desc->pg_count;
hdr->dreq = desc->pg_dreq;
+ hdr->layout_private = desc->pg_layout_private;
+ hdr->moreio = desc->pg_moreio;
hdr->release = release;
hdr->completion_ops = desc->pg_completion_ops;
if (hdr->completion_ops->init_hdr)
@@ -267,6 +269,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
desc->pg_error = 0;
desc->pg_lseg = NULL;
desc->pg_dreq = NULL;
+ desc->pg_layout_private = NULL;
}
/**
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 88d166b..63093b1 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -69,6 +69,7 @@ struct nfs_pageio_descriptor {
const struct nfs_pgio_completion_ops *pg_completion_ops;
struct pnfs_layout_segment *pg_lseg;
struct nfs_direct_req *pg_dreq;
+ void *pg_layout_private;
};
#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 2e53a3f..88e95a7 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1224,6 +1224,8 @@ struct nfs_pgio_header {
void (*release) (struct nfs_pgio_header *hdr);
const struct nfs_pgio_completion_ops *completion_ops;
struct nfs_direct_req *dreq;
+ void *layout_private;
+ bool moreio;
spinlock_t lock;
/* fields protected by lock */
int pnfs_error;
--
1.7.1.262.g5ef3d
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO
2012-05-29 4:38 [PATCH-v2 0/3] pnfsblock: cope with DIO changes Peng Tao
2012-05-29 4:38 ` [PATCH-v2 1/3] pnfsblock: bail out partial block direct write Peng Tao
2012-05-29 4:38 ` [PATCH-v2 2/3] NFS41: add pg_layout_private and moreio fields Peng Tao
@ 2012-05-29 4:38 ` Peng Tao
2012-05-31 21:22 ` Myklebust, Trond
2 siblings, 1 reply; 7+ messages in thread
From: Peng Tao @ 2012-05-29 4:38 UTC (permalink / raw)
To: Trond.Myklebust; +Cc: linux-nfs, bharrosh, Peng Tao
NFS DIO bypasses generic DIO code path. So we need to plug/unplug
on our own.
Signed-off-by: Peng Tao <tao.peng@emc.com>
---
fs/nfs/blocklayout/blocklayout.c | 47 +++++++++++++++++++++++++++++++++++++-
1 files changed, 46 insertions(+), 1 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index bab432f..b48b08b 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -251,6 +251,7 @@ bl_read_pagelist(struct nfs_read_data *rdata)
dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__,
rdata->pages.npages, f_offset, (unsigned int)rdata->args.count);
+ BUG_ON(header->dreq && header->layout_private == NULL);
if (!bl_check_alignment(f_offset, rdata->args.count, PAGE_CACHE_MASK))
goto use_mds;
@@ -320,9 +321,17 @@ out:
bl_put_extent(cow_read);
bl_submit_bio(READ, bio);
put_parallel(par);
+ if (header->dreq && !header->moreio) {
+ blk_finish_plug((struct blk_plug *)header->layout_private);
+ kfree(header->layout_private);
+ }
return PNFS_ATTEMPTED;
- use_mds:
+use_mds:
+ if (header->dreq) {
+ blk_finish_plug((struct blk_plug *)header->layout_private);
+ kfree(header->layout_private);
+ }
dprintk("Giving up and using normal NFS\n");
return PNFS_NOT_ATTEMPTED;
}
@@ -575,6 +584,8 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
unsigned long blkmask = PAGE_CACHE_MASK;
dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
+ BUG_ON(header->dreq && header->layout_private == NULL);
+
/* Check for alignment first */
if (header->dreq)
blkmask = NFS_SERVER(header->inode)->pnfs_blksize - 1;
@@ -740,8 +751,16 @@ out:
bl_put_extent(be);
bl_submit_bio(WRITE, bio);
put_parallel(par);
+ if (header->dreq && !header->moreio) {
+ blk_finish_plug((struct blk_plug *)header->layout_private);
+ kfree(header->layout_private);
+ }
return PNFS_ATTEMPTED;
out_mds:
+ if (header->dreq) {
+ blk_finish_plug((struct blk_plug *)header->layout_private);
+ kfree(header->layout_private);
+ }
bl_put_extent(be);
kfree(par);
return PNFS_NOT_ATTEMPTED;
@@ -1017,15 +1036,30 @@ bl_clear_layoutdriver(struct nfs_server *server)
static void
bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
+ BUG_ON(pgio->pg_layout_private != NULL);
+
if (!bl_check_alignment(req->wb_offset, req->wb_bytes, PAGE_CACHE_MASK))
nfs_pageio_reset_read_mds(pgio);
else
pnfs_generic_pg_init_read(pgio, req);
+
+ if (pgio->pg_dreq && pgio->pg_lseg) {
+ struct blk_plug *plug;
+ /* Freed in bl_read_pagelist */
+ plug = kmalloc(sizeof(struct blk_plug), GFP_KERNEL);
+ if (plug != NULL) {
+ blk_start_plug(plug);
+ pgio->pg_layout_private = plug;
+ } else
+ nfs_pageio_reset_read_mds(pgio);
+ }
}
static void
bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
+ BUG_ON(pgio->pg_layout_private != NULL);
+
if (pgio->pg_dreq) {
/* Direct write should be blksize aligned */
unsigned blkmask = NFS_SERVER(pgio->pg_inode)->pnfs_blksize - 1;
@@ -1038,6 +1072,17 @@ bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
nfs_pageio_reset_write_mds(pgio);
else
pnfs_generic_pg_init_write(pgio, req);
+
+ if (pgio->pg_dreq && pgio->pg_lseg) {
+ struct blk_plug *plug;
+ /* Freed in bl_write_pagelist */
+ plug = kmalloc(sizeof(struct blk_plug), GFP_NOFS);
+ if (plug != NULL) {
+ blk_start_plug(plug);
+ pgio->pg_layout_private = plug;
+ } else
+ nfs_pageio_reset_write_mds(pgio);
+ }
}
static const struct nfs_pageio_ops bl_pg_read_ops = {
--
1.7.1.262.g5ef3d
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO
2012-05-29 4:38 ` [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO Peng Tao
@ 2012-05-31 21:22 ` Myklebust, Trond
2012-06-01 2:59 ` tao.peng
0 siblings, 1 reply; 7+ messages in thread
From: Myklebust, Trond @ 2012-05-31 21:22 UTC (permalink / raw)
To: Peng Tao; +Cc: linux-nfs@vger.kernel.org, bharrosh@panasas.com, Peng Tao
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* RE: [PATCH-v2 3/3] pnfsblock: call blk_plug functions for direct IO
2012-05-31 21:22 ` Myklebust, Trond
@ 2012-06-01 2:59 ` tao.peng
0 siblings, 0 replies; 7+ messages in thread
From: tao.peng @ 2012-06-01 2:59 UTC (permalink / raw)
To: Trond.Myklebust; +Cc: linux-nfs, bharrosh
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