[PATCH-v2 1/3] NFS: track direct IO left bytes

[PATCH-v2 1/3] NFS: track direct IO left bytes

[Peng Tao]

Signed-off-by: Peng Tao <tao.peng@emc.com>
---
 fs/nfs/direct.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 34a6282..c39f775 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -78,6 +78,7 @@ struct nfs_direct_req {
 	atomic_t		io_count;	/* i/os we're waiting for */
 	spinlock_t		lock;		/* protect completion state */
 	ssize_t			count,		/* bytes actually processed */
+				bytes_left,	/* bytes left to be sent */
 				error;		/* any reported error */
 	struct completion	completion;	/* wait for i/o completion */
 
@@ -390,6 +391,7 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_pageio_descriptor *de
 			user_addr += req_len;
 			pos += req_len;
 			count -= req_len;
+			dreq->bytes_left -= req_len;
 		}
 		/* The nfs_page now hold references to these pages */
 		nfs_direct_release_pages(pagevec, npages);
@@ -456,6 +458,7 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
 		goto out;
 
 	dreq->inode = inode;
+	dreq->bytes_left = iov_length(iov, nr_segs);
 	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
 	dreq->l_ctx = nfs_get_lock_context(dreq->ctx);
 	if (dreq->l_ctx == NULL)
@@ -706,6 +709,7 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_pageio_descriptor *d
 			user_addr += req_len;
 			pos += req_len;
 			count -= req_len;
+			dreq->bytes_left -= req_len;
 		}
 		/* The nfs_page now hold references to these pages */
 		nfs_direct_release_pages(pagevec, npages);
@@ -855,6 +859,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov,
 		goto out;
 
 	dreq->inode = inode;
+	dreq->bytes_left = count;
 	dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
 	dreq->l_ctx = nfs_get_lock_context(dreq->ctx);
 	if (dreq->l_ctx == NULL)
-- 
1.7.1.262.g5ef3d

[PATCH-v2 2/3] NFS41: send real write size in layoutget

[Peng Tao]

For buffer write, use policy based mechanism to determine layoutget size.
Currently files use whole file layout, objects use offset-to-isize, and
blocks search next hole in inode mapping and use offset-to-hole.

For direct write, just use dreq->bytes_left.

Signed-off-by: Peng Tao <tao.peng@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |    1 +
 fs/nfs/direct.c                  |    7 +++++
 fs/nfs/internal.h                |    1 +
 fs/nfs/nfs4filelayout.c          |    1 +
 fs/nfs/objlayout/objio_osd.c     |    3 +-
 fs/nfs/pnfs.c                    |   51 +++++++++++++++++++++++++++++++++++++-
 fs/nfs/pnfs.h                    |   13 +++++++++
 7 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 1093968..c4215cf 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -1240,6 +1240,7 @@ static const struct nfs_pageio_ops bl_pg_write_ops = {
 static struct pnfs_layoutdriver_type blocklayout_type = {
 	.id				= LAYOUT_BLOCK_VOLUME,
 	.name				= "LAYOUT_BLOCK_VOLUME",
+	.flags				= PNFS_LAYOUTGET_SEARCH_HOLE,
 	.read_pagelist			= bl_read_pagelist,
 	.write_pagelist			= bl_write_pagelist,
 	.alloc_layout_hdr		= bl_alloc_layout_hdr,
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index c39f775..c1899dd 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -46,6 +46,7 @@
 #include <linux/kref.h>
 #include <linux/slab.h>
 #include <linux/task_io_accounting_ops.h>
+#include <linux/module.h>
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_page.h>
@@ -191,6 +192,12 @@ static void nfs_direct_req_release(struct nfs_direct_req *dreq)
 	kref_put(&dreq->kref, nfs_direct_req_free);
 }
 
+ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq)
+{
+	return dreq->bytes_left;
+}
+EXPORT_SYMBOL_GPL(nfs_dreq_bytes_left);
+
 /*
  * Collects and returns the final error value/byte-count.
  */
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 31fdb03..e68d329 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -464,6 +464,7 @@ static inline void nfs_inode_dio_wait(struct inode *inode)
 {
 	inode_dio_wait(inode);
 }
+extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 
 /* nfs4proc.c */
 extern void __nfs4_read_done_cb(struct nfs_read_data *);
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index 53f94d9..f81edd7 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -1289,6 +1289,7 @@ filelayout_get_ds_info(struct inode *inode)
 static struct pnfs_layoutdriver_type filelayout_type = {
 	.id			= LAYOUT_NFSV4_1_FILES,
 	.name			= "LAYOUT_NFSV4_1_FILES",
+	.flags			= PNFS_LAYOUTGET_ALL_FILE,
 	.owner			= THIS_MODULE,
 	.alloc_layout_hdr	= filelayout_alloc_layout_hdr,
 	.free_layout_hdr	= filelayout_free_layout_hdr,
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index ea6d111..e487fb8 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -638,7 +638,8 @@ static struct pnfs_layoutdriver_type objlayout_type = {
 	.id = LAYOUT_OSD2_OBJECTS,
 	.name = "LAYOUT_OSD2_OBJECTS",
 	.flags                   = PNFS_LAYOUTRET_ON_SETATTR |
-				   PNFS_LAYOUTRET_ON_ERROR,
+				   PNFS_LAYOUTRET_ON_ERROR |
+				   PNFS_LAYOUTGET_ISIZE,
 
 	.alloc_layout_hdr        = objlayout_alloc_layout_hdr,
 	.free_layout_hdr         = objlayout_free_layout_hdr,
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 2e00fea..d1da23a 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -29,6 +29,7 @@
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_page.h>
+#include <linux/pagevec.h>
 #include <linux/module.h>
 #include "internal.h"
 #include "pnfs.h"
@@ -1172,19 +1173,67 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
 
+/*
+ * Return the number of contiguous bytes for a given inode
+ * starting at page frame idx.
+ */
+static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
+{
+	struct address_space *mapping = inode->i_mapping;
+	pgoff_t end;
+
+	/* Optimize common case that writes from 0 to end of file */
+	end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE);
+	if (end != NFS_I(inode)->npages) {
+		rcu_read_lock();
+		end = radix_tree_next_hole(&mapping->page_tree, idx + 1, ULONG_MAX);
+		rcu_read_unlock();
+	}
+
+	if (!end)
+		return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT);
+	else
+		return (end - idx) << PAGE_CACHE_SHIFT;
+}
+
 void
 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
 {
+	u64 wb_size;
+	unsigned policy = NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->flags &
+						PNFS_LAYOUTGET_POLICY_MASK;
+
 	BUG_ON(pgio->pg_lseg != NULL);
 
 	if (req->wb_offset != req->wb_pgbase) {
 		nfs_pageio_reset_write_mds(pgio);
 		return;
 	}
+
+	if (pgio->pg_dreq == NULL) {
+		switch(policy) {
+		case PNFS_LAYOUTGET_ISIZE:
+			wb_size = i_size_read(pgio->pg_inode) - req_offset(req);
+			break;
+		case PNFS_LAYOUTGET_SEARCH_HOLE:
+			wb_size = pnfs_num_cont_bytes(pgio->pg_inode, req->wb_index);
+			break;
+		case PNFS_LAYOUTGET_ALL_FILE:
+			wb_size = NFS4_MAX_UINT64;
+			break;
+		default:
+			WARN_ONCE(1, "invalid layoutget policy %u", policy);
+			wb_size = PAGE_CACHE_SIZE;
+			break;
+		}
+	} else {
+		wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
+	}
+
 	pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 					   req->wb_context,
 					   req_offset(req),
-					   req->wb_bytes,
+					   wb_size,
 					   IOMODE_RW,
 					   GFP_NOFS);
 	/* If no lseg, fall back to write through mds */
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 745aa1b..ce86894 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -71,8 +71,21 @@ enum layoutdriver_policy_flags {
 	/* Should the pNFS client commit and return the layout upon a setattr */
 	PNFS_LAYOUTRET_ON_SETATTR	= 1 << 0,
 	PNFS_LAYOUTRET_ON_ERROR		= 1 << 1,
+
+	/* Layoutget(write) length policy:
+	 * PNFS_LAYOUTGET_ISIZE, use offset-to-isize
+	 * PNFS_LAYOUTGET_SEARCH_HOLE, use offset-to-hole
+	 * PNFS_LAYOUTGET_ALL_FILE, use NFS4_MAX_UINT64
+	 */
+	PNFS_LAYOUTGET_ISIZE		= 1 << 2,
+	PNFS_LAYOUTGET_SEARCH_HOLE	= 1 << 3,
+	PNFS_LAYOUTGET_ALL_FILE		= 1 << 4,
 };
 
+#define PNFS_LAYOUTGET_POLICY_MASK	(PNFS_LAYOUTGET_ISIZE |		\
+					 PNFS_LAYOUTGET_SEARCH_HOLE |	\
+					 PNFS_LAYOUTGET_ALL_FILE)
+
 struct nfs4_deviceid_node;
 
 /* Per-layout driver specific registration structure */
-- 
1.7.1.262.g5ef3d

Re: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Boaz Harrosh]

On 08/13/2012 05:39 PM, Peng Tao wrote:

> For buffer write, use policy based mechanism to determine layoutget size.
> Currently files use whole file layout, objects use offset-to-isize, and
> blocks search next hole in inode mapping and use offset-to-hole.
> 
> For direct write, just use dreq->bytes_left.
> 
> Signed-off-by: Peng Tao <tao.peng@emc.com>
> ---
>  fs/nfs/blocklayout/blocklayout.c |    1 +
>  fs/nfs/direct.c                  |    7 +++++
>  fs/nfs/internal.h                |    1 +
>  fs/nfs/nfs4filelayout.c          |    1 +
>  fs/nfs/objlayout/objio_osd.c     |    3 +-
>  fs/nfs/pnfs.c                    |   51 +++++++++++++++++++++++++++++++++++++-
>  fs/nfs/pnfs.h                    |   13 +++++++++
>  7 files changed, 75 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
> index 1093968..c4215cf 100644
> --- a/fs/nfs/blocklayout/blocklayout.c
> +++ b/fs/nfs/blocklayout/blocklayout.c
> @@ -1240,6 +1240,7 @@ static const struct nfs_pageio_ops bl_pg_write_ops = {
>  static struct pnfs_layoutdriver_type blocklayout_type = {
>  	.id				= LAYOUT_BLOCK_VOLUME,
>  	.name				= "LAYOUT_BLOCK_VOLUME",
> +	.flags				= PNFS_LAYOUTGET_SEARCH_HOLE,
>  	.read_pagelist			= bl_read_pagelist,
>  	.write_pagelist			= bl_write_pagelist,
>  	.alloc_layout_hdr		= bl_alloc_layout_hdr,
> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
> index c39f775..c1899dd 100644
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -46,6 +46,7 @@
>  #include <linux/kref.h>
>  #include <linux/slab.h>
>  #include <linux/task_io_accounting_ops.h>
> +#include <linux/module.h>
>  
>  #include <linux/nfs_fs.h>
>  #include <linux/nfs_page.h>
> @@ -191,6 +192,12 @@ static void nfs_direct_req_release(struct nfs_direct_req *dreq)
>  	kref_put(&dreq->kref, nfs_direct_req_free);
>  }
>  
> +ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq)
> +{
> +	return dreq->bytes_left;
> +}
> +EXPORT_SYMBOL_GPL(nfs_dreq_bytes_left);
> +
>  /*
>   * Collects and returns the final error value/byte-count.
>   */
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index 31fdb03..e68d329 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -464,6 +464,7 @@ static inline void nfs_inode_dio_wait(struct inode *inode)
>  {
>  	inode_dio_wait(inode);
>  }
> +extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
>  
>  /* nfs4proc.c */
>  extern void __nfs4_read_done_cb(struct nfs_read_data *);
> diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
> index 53f94d9..f81edd7 100644
> --- a/fs/nfs/nfs4filelayout.c
> +++ b/fs/nfs/nfs4filelayout.c
> @@ -1289,6 +1289,7 @@ filelayout_get_ds_info(struct inode *inode)
>  static struct pnfs_layoutdriver_type filelayout_type = {
>  	.id			= LAYOUT_NFSV4_1_FILES,
>  	.name			= "LAYOUT_NFSV4_1_FILES",
> +	.flags			= PNFS_LAYOUTGET_ALL_FILE,
>  	.owner			= THIS_MODULE,
>  	.alloc_layout_hdr	= filelayout_alloc_layout_hdr,
>  	.free_layout_hdr	= filelayout_free_layout_hdr,
> diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
> index ea6d111..e487fb8 100644
> --- a/fs/nfs/objlayout/objio_osd.c
> +++ b/fs/nfs/objlayout/objio_osd.c
> @@ -638,7 +638,8 @@ static struct pnfs_layoutdriver_type objlayout_type = {
>  	.id = LAYOUT_OSD2_OBJECTS,
>  	.name = "LAYOUT_OSD2_OBJECTS",
>  	.flags                   = PNFS_LAYOUTRET_ON_SETATTR |
> -				   PNFS_LAYOUTRET_ON_ERROR,
> +				   PNFS_LAYOUTRET_ON_ERROR |
> +				   PNFS_LAYOUTGET_ISIZE,
>  
>  	.alloc_layout_hdr        = objlayout_alloc_layout_hdr,
>  	.free_layout_hdr         = objlayout_free_layout_hdr,
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index 2e00fea..d1da23a 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -29,6 +29,7 @@
>  
>  #include <linux/nfs_fs.h>
>  #include <linux/nfs_page.h>
> +#include <linux/pagevec.h>
>  #include <linux/module.h>
>  #include "internal.h"
>  #include "pnfs.h"
> @@ -1172,19 +1173,67 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
>  }
>  EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
>  
> +/*
> + * Return the number of contiguous bytes for a given inode
> + * starting at page frame idx.
> + */
> +static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx)
> +{
> +	struct address_space *mapping = inode->i_mapping;
> +	pgoff_t end;
> +
> +	/* Optimize common case that writes from 0 to end of file */
> +	end = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE);
> +	if (end != NFS_I(inode)->npages) {
> +		rcu_read_lock();
> +		end = radix_tree_next_hole(&mapping->page_tree, idx + 1, ULONG_MAX);
> +		rcu_read_unlock();
> +	}
> +
> +	if (!end)
> +		return i_size_read(inode) - (idx << PAGE_CACHE_SHIFT);
> +	else
> +		return (end - idx) << PAGE_CACHE_SHIFT;
> +}
> +
>  void
>  pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
>  {
> +	u64 wb_size;
> +	unsigned policy = NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->flags &
> +						PNFS_LAYOUTGET_POLICY_MASK;
> +
>  	BUG_ON(pgio->pg_lseg != NULL);
>  
>  	if (req->wb_offset != req->wb_pgbase) {
>  		nfs_pageio_reset_write_mds(pgio);
>  		return;
>  	}
> +
> +	if (pgio->pg_dreq == NULL) {
> +		switch(policy) {
> +		case PNFS_LAYOUTGET_ISIZE:
> +			wb_size = i_size_read(pgio->pg_inode) - req_offset(req);
> +			break;
> +		case PNFS_LAYOUTGET_SEARCH_HOLE:
> +			wb_size = pnfs_num_cont_bytes(pgio->pg_inode, req->wb_index);
> +			break;
> +		case PNFS_LAYOUTGET_ALL_FILE:
> +			wb_size = NFS4_MAX_UINT64;
> +			break;
> +		default:
> +			WARN_ONCE(1, "invalid layoutget policy %u", policy);
> +			wb_size = PAGE_CACHE_SIZE;
> +			break;
> +		}
> +	} else {
> +		wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
> +	}
> +
>  	pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
>  					   req->wb_context,
>  					   req_offset(req),
> -					   req->wb_bytes,
> +					   wb_size,
>  					   IOMODE_RW,
>  					   GFP_NOFS);
>  	/* If no lseg, fall back to write through mds */
> diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
> index 745aa1b..ce86894 100644
> --- a/fs/nfs/pnfs.h
> +++ b/fs/nfs/pnfs.h
> @@ -71,8 +71,21 @@ enum layoutdriver_policy_flags {
>  	/* Should the pNFS client commit and return the layout upon a setattr */
>  	PNFS_LAYOUTRET_ON_SETATTR	= 1 << 0,
>  	PNFS_LAYOUTRET_ON_ERROR		= 1 << 1,
> +
> +	/* Layoutget(write) length policy:
> +	 * PNFS_LAYOUTGET_ISIZE, use offset-to-isize
> +	 * PNFS_LAYOUTGET_SEARCH_HOLE, use offset-to-hole
> +	 * PNFS_LAYOUTGET_ALL_FILE, use NFS4_MAX_UINT64
> +	 */
> +	PNFS_LAYOUTGET_ISIZE		= 1 << 2,
> +	PNFS_LAYOUTGET_SEARCH_HOLE	= 1 << 3,
> +	PNFS_LAYOUTGET_ALL_FILE		= 1 << 4,
>  };
>  
> +#define PNFS_LAYOUTGET_POLICY_MASK	(PNFS_LAYOUTGET_ISIZE |		\
> +					 PNFS_LAYOUTGET_SEARCH_HOLE |	\
> +					 PNFS_LAYOUTGET_ALL_FILE)
> +
>  struct nfs4_deviceid_node;
>  
>  /* Per-layout driver specific registration structure */


All 3 looks very good now (fast scan through). However they need heavy
testing. I will only get to them early next week.

How do they perform for you? please report your finding with the EMC
server it is interesting to know.

Thanks for working on this
Boaz

RE: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Peng, Tao]

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DQo=

Re: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Myklebust, Trond]

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DQo=

RE: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Peng, Tao]

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Re: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Boaz Harrosh]

On 08/14/2012 03:42 AM, Myklebust, Trond wrote:
<>

>>  void
>>  pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
>>  {
>> +	u64 wb_size;
>> +	unsigned policy = NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->flags &
>> +						PNFS_LAYOUTGET_POLICY_MASK;
>> +
>>  	BUG_ON(pgio->pg_lseg != NULL);
>>  
>>  	if (req->wb_offset != req->wb_pgbase) {
>>  		nfs_pageio_reset_write_mds(pgio);
>>  		return;
>>  	}
>> +
>> +	if (pgio->pg_dreq == NULL) {
>> +		switch(policy) {
>> +		case PNFS_LAYOUTGET_ISIZE:
>> +			wb_size = i_size_read(pgio->pg_inode) - req_offset(req);
>> +			break;
>> +		case PNFS_LAYOUTGET_SEARCH_HOLE:
>> +			wb_size = pnfs_num_cont_bytes(pgio->pg_inode, req->wb_index);
>> +			break;
>> +		case PNFS_LAYOUTGET_ALL_FILE:
>> +			wb_size = NFS4_MAX_UINT64;
>> +			break;
>> +		default:
>> +			WARN_ONCE(1, "invalid layoutget policy %u", policy);
>> +			wb_size = PAGE_CACHE_SIZE;
>> +			break;
>> +		}
>> +	} else {
>> +		wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
>> +	}
>> +
> 
> Please just calculate the correct value for wb_size inside
> bl_pg_init_write(), and pass it as an extra parameter to
> pnfs_generic_pg_init_write().
> 
> Then add pnfs_pg_init_object_write for objects, that calls the modified
> pnfs_generic_pg_init_write() with the PNFS_LAYOUTGET_ISIZE value.
> 


Lets please completely kill pnfs_generic_pg_init_write() just like 
files did. It gives us nothing and specialty now it is more compact
code to just inline it, like nfs4filelayout.c did.

But please do this on top of my pending patches for 3.6-rcX. They touch
exactly this code in objects.

> Files don't call this function, so adding the PNFS_LAYOUTGET_ALL_FILE
> isn't needed.


BTW:
	filelayout_pg_init_read()
	and 
	pnfs_generic_pg_init_read()
  Is char-by-char Identical, except the very good added comment in
  filelayout_pg_init_read(). Can be merged.

Thanks
Boaz

RE: [PATCH-v2 2/3] NFS41: send real write size in layoutget

[Peng, Tao]

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[PATCH-v2 3/3] NFS41: send real read size in layoutget

[Peng Tao]

For buffer read, use offst-to-isize.

For direct read, use dreq->bytes_left.

Signed-off-by: Peng Tao <tao.peng@emc.com>
---
 fs/nfs/pnfs.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index d1da23a..49d2f2d 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1154,16 +1154,24 @@ out_forget_reply:
 void
 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
 {
+	u64 rd_size = req->wb_bytes;
+
 	BUG_ON(pgio->pg_lseg != NULL);
 
 	if (req->wb_offset != req->wb_pgbase) {
 		nfs_pageio_reset_read_mds(pgio);
 		return;
 	}
+
+	if (pgio->pg_dreq == NULL)
+		rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
+	else
+		rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
+
 	pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 					   req->wb_context,
 					   req_offset(req),
-					   req->wb_bytes,
+					   rd_size,
 					   IOMODE_READ,
 					   GFP_KERNEL);
 	/* If no lseg, fall back to read through mds */
-- 
1.7.1.262.g5ef3d