[PATCH 0/9] pnfsblock patches

[PATCH 0/9] pnfsblock patches

[Peng Tao]

Hi, Trond,

Following are some bugfix and improvements for blocklayout driver. All have been
sent to the list before and have been tested for several weeks.

Peng Tao (9):
  pnfsblock: cleanup bl_mark_sectors_init
  pnfsblock: acquire im_lock in _preload_range
  pnfsblock: move find lock page logic out of bl_write_pagelist
  pnfsblock: set read/write tk_status to pnfs_error
  pnfsblock: remove rpc_call_ops from struct parallel_io
  pnfsblock: clean up _add_entry
  pnfsblock: alloc short extent before submit bio
  pnfsblock: don't spinlock when freeing block_dev
  pnfsblock: limit bio page count

 fs/nfs/blocklayout/blocklayout.c |  202 ++++++++++++++++++++++++-------------
 fs/nfs/blocklayout/blocklayout.h |   12 ++-
 fs/nfs/blocklayout/extents.c     |  176 ++++++++++++++-------------------
 3 files changed, 215 insertions(+), 175 deletions(-)

Re: [PATCH 0/9] pnfsblock patches

[Jim Rees]

Peng Tao wrote:

  Hi, Trond,
  
  Following are some bugfix and improvements for blocklayout driver. All have been
  sent to the list before and have been tested for several weeks.

Patches 2/9 and 8/9 are missing again.  I wonder why these particular
patches are getting filtered out?

RE: [PATCH 0/9] pnfsblock patches

[tao.peng]

[-- Attachment #1: Type: text/plain, Size: 1018 bytes --]

> -----Original Message-----
> From: linux-nfs-owner@vger.kernel.org [mailto:linux-nfs-owner@vger.kernel.org] On Behalf Of Jim Rees
> Sent: Wednesday, November 30, 2011 2:44 AM
> To: Peng Tao
> Cc: Trond.Myklebust@netapp.com; linux-nfs@vger.kernel.org
> Subject: Re: [PATCH 0/9] pnfsblock patches
> 
> Peng Tao wrote:
> 
>   Hi, Trond,
> 
>   Following are some bugfix and improvements for blocklayout driver. All have been
>   sent to the list before and have been tested for several weeks.
> 
> Patches 2/9 and 8/9 are missing again.  I wonder why these particular
> patches are getting filtered out?
I have received these patches in both my gmail box and emc mail box. So I guess vger dropped them, again... Somehow it thinks I'm a spammer?
I attached 2/9, 8/9, 9/9 here...

Thanks,
Tao
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


[-- Attachment #2: 0002-pnfsblock-acquire-im_lock-in-_preload_range.patch --]
[-- Type: application/octet-stream, Size: 2008 bytes --]

From d289ab2f6174316374641a87fa5d4c0c9c30203b Mon Sep 17 00:00:00 2001
From: Peng Tao <bergwolf@gmail.com>
Date: Wed, 2 Nov 2011 01:11:14 -0400
Subject: [PATCH 2/9] pnfsblock: acquire im_lock in _preload_range

When calling _add_entry, we should take the im_lock to protect
agains other modifiers.

Cc: stable@kernel.org [3.1]
Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/extents.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index 0fc1321..f383524 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -139,11 +139,13 @@ static int _set_range(struct my_tree *tree, int32_t tag, u64 s, u64 length)
 }
 
 /* Ensure that future operations on given range of tree will not malloc */
-static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
+static int _preload_range(struct pnfs_inval_markings *marks,
+		u64 offset, u64 length)
 {
 	u64 start, end, s;
 	int count, i, used = 0, status = -ENOMEM;
 	struct pnfs_inval_tracking **storage;
+	struct my_tree  *tree = &marks->im_tree;
 
 	dprintk("%s(%llu, %llu) enter\n", __func__, offset, length);
 	start = normalize(offset, tree->mtt_step_size);
@@ -161,12 +163,11 @@ static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
 			goto out_cleanup;
 	}
 
-	/* Now need lock - HOW??? */
-
+	spin_lock(&marks->im_lock);
 	for (s = start; s < end; s += tree->mtt_step_size)
 		used += _add_entry(tree, s, INTERNAL_EXISTS, storage[used]);
+	spin_unlock(&marks->im_lock);
 
-	/* Unlock - HOW??? */
 	status = 0;
 
  out_cleanup:
@@ -246,7 +247,7 @@ int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
 
 	start = normalize(offset, marks->im_block_size);
 	end = normalize_up(offset + length, marks->im_block_size);
-	if (_preload_range(&marks->im_tree, start, end - start))
+	if (_preload_range(marks, start, end - start))
 		goto outerr;
 
 	spin_lock(&marks->im_lock);
-- 
1.7.4.2


[-- Attachment #3: 0008-pnfsblock-don-t-spinlock-when-freeing-block_dev.patch --]
[-- Type: application/octet-stream, Size: 1409 bytes --]

From ae38b3ab081b76f10767d08e34e92a0c89fab842 Mon Sep 17 00:00:00 2001
From: Peng Tao <bergwolf@gmail.com>
Date: Thu, 10 Nov 2011 02:45:44 -0500
Subject: [PATCH 8/9] pnfsblock: don't spinlock when freeing block_dev

bl_free_block_dev() may sleep. We can not call it with spinlock held.
Besides, there is no need to take bm_lock as we are last user freeing bm_devlist.

Cc: stable@kernel.org [3.1]
Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 1dd2983..c9c74bf 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -837,16 +837,13 @@ bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
 static void free_blk_mountid(struct block_mount_id *mid)
 {
 	if (mid) {
-		struct pnfs_block_dev *dev;
-		spin_lock(&mid->bm_lock);
-		while (!list_empty(&mid->bm_devlist)) {
-			dev = list_first_entry(&mid->bm_devlist,
-					       struct pnfs_block_dev,
-					       bm_node);
+		struct pnfs_block_dev *dev, *tmp;
+
+		/* No need to take bm_lock as we are last user freeing bm_devlist */
+		list_for_each_entry_safe(dev, tmp, &mid->bm_devlist, bm_node) {
 			list_del(&dev->bm_node);
 			bl_free_block_dev(dev);
 		}
-		spin_unlock(&mid->bm_lock);
 		kfree(mid);
 	}
 }
-- 
1.7.4.2


[-- Attachment #4: 0009-pnfsblock-limit-bio-page-count.patch --]
[-- Type: application/octet-stream, Size: 1392 bytes --]

From faa4ce324687b87c37f993c219d15061072ad6a6 Mon Sep 17 00:00:00 2001
From: Peng Tao <bergwolf@gmail.com>
Date: Sat, 19 Nov 2011 04:16:52 -0500
Subject: [PATCH 9/9] pnfsblock: limit bio page count

One bio can have at most BIO_MAX_PAGES pages. We should limit it bec otherwise
bio_alloc will fail when there are many pages in one read/write_pagelist.

CC: stable@kernel.org [3.1]
Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index c9c74bf..48cfac3 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -147,14 +147,19 @@ static struct bio *bl_alloc_init_bio(int npg, sector_t isect,
 {
 	struct bio *bio;
 
+	npg = min(npg, BIO_MAX_PAGES);
 	bio = bio_alloc(GFP_NOIO, npg);
-	if (!bio)
-		return NULL;
+	if (!bio && (current->flags & PF_MEMALLOC)) {
+		while (!bio && (npg /= 2))
+			bio = bio_alloc(GFP_NOIO, npg);
+	}
 
-	bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
-	bio->bi_bdev = be->be_mdev;
-	bio->bi_end_io = end_io;
-	bio->bi_private = par;
+	if (bio) {
+		bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
+		bio->bi_bdev = be->be_mdev;
+		bio->bi_end_io = end_io;
+		bio->bi_private = par;
+	}
 	return bio;
 }
 
-- 
1.7.4.2

Re: [PATCH 0/9] pnfsblock patches

[Benny Halevy]

I merged patches 8 and 9 into my tree

Benny

On 2011-11-30 04:37, tao.peng@emc.com wrote:
>> -----Original Message-----
>> From: linux-nfs-owner@vger.kernel.org [mailto:linux-nfs-owner@vger.kernel.org] On Behalf Of Jim Rees
>> Sent: Wednesday, November 30, 2011 2:44 AM
>> To: Peng Tao
>> Cc: Trond.Myklebust@netapp.com; linux-nfs@vger.kernel.org
>> Subject: Re: [PATCH 0/9] pnfsblock patches
>>
>> Peng Tao wrote:
>>
>>   Hi, Trond,
>>
>>   Following are some bugfix and improvements for blocklayout driver. All have been
>>   sent to the list before and have been tested for several weeks.
>>
>> Patches 2/9 and 8/9 are missing again.  I wonder why these particular
>> patches are getting filtered out?
> I have received these patches in both my gmail box and emc mail box. So I guess vger dropped them, again... Somehow it thinks I'm a spammer?
> I attached 2/9, 8/9, 9/9 here...
> 
> Thanks,
> Tao
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: [PATCH 0/9] pnfsblock patches

[Peng Tao]

On Wed, Nov 30, 2011 at 9:05 PM, Benny Halevy <bhalevy@tonian.com> wrote:
> I merged patches 8 and 9 into my tree
>
Thanks!

> Benny
>
> On 2011-11-30 04:37, tao.peng@emc.com wrote:
>>> -----Original Message-----
>>> From: linux-nfs-owner@vger.kernel.org [mailto:linux-nfs-owner@vger.kernel.org] On Behalf Of Jim Rees
>>> Sent: Wednesday, November 30, 2011 2:44 AM
>>> To: Peng Tao
>>> Cc: Trond.Myklebust@netapp.com; linux-nfs@vger.kernel.org
>>> Subject: Re: [PATCH 0/9] pnfsblock patches
>>>
>>> Peng Tao wrote:
>>>
>>>   Hi, Trond,
>>>
>>>   Following are some bugfix and improvements for blocklayout driver. All have been
>>>   sent to the list before and have been tested for several weeks.
>>>
>>> Patches 2/9 and 8/9 are missing again.  I wonder why these particular
>>> patches are getting filtered out?
>> I have received these patches in both my gmail box and emc mail box. So I guess vger dropped them, again... Somehow it thinks I'm a spammer?
>> I attached 2/9, 8/9, 9/9 here...
>>
>> Thanks,
>> Tao
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>

Re: [PATCH 0/9] pnfsblock patches

[Boaz Harrosh]

On 12/02/2011 08:46 PM, Peng Tao wrote:
> Hi, Trond,
> 
> Following are some bugfix and improvements for blocklayout driver. All have been
> sent to the list before and have been tested for several weeks.
> 

I never got 9 patches in the mail.

I only have 1,3,4,5,6,7

Do you have them on a gitweb, or re-post 2,8,9

Thanks
Boaz

> Peng Tao (9):
>   pnfsblock: cleanup bl_mark_sectors_init
>   pnfsblock: acquire im_lock in _preload_range
>   pnfsblock: move find lock page logic out of bl_write_pagelist
>   pnfsblock: set read/write tk_status to pnfs_error
>   pnfsblock: remove rpc_call_ops from struct parallel_io
>   pnfsblock: clean up _add_entry
>   pnfsblock: alloc short extent before submit bio
>   pnfsblock: don't spinlock when freeing block_dev
>   pnfsblock: limit bio page count
> 
>  fs/nfs/blocklayout/blocklayout.c |  202 ++++++++++++++++++++++++-------------
>  fs/nfs/blocklayout/blocklayout.h |   12 ++-
>  fs/nfs/blocklayout/extents.c     |  176 ++++++++++++++-------------------
>  3 files changed, 215 insertions(+), 175 deletions(-)
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH 0/9] pnfsblock patches

[Jim Rees]

Boaz Harrosh wrote:

  On 12/02/2011 08:46 PM, Peng Tao wrote:
  > Hi, Trond,
  > 
  > Following are some bugfix and improvements for blocklayout driver. All have been
  > sent to the list before and have been tested for several weeks.
  > 
  
  I never got 9 patches in the mail.
  
  I only have 1,3,4,5,6,7
  
  Do you have them on a gitweb, or re-post 2,8,9

1-7 are in benny's tree:

% git log --oneline -7 benny/pnfs-block
ec11faf pnfsblock: alloc short extent before submit bio
7c93c37 pnfsblock: clean up _add_entry
85e8c84 pnfsblock: remove rpc_call_ops from struct parallel_io
ab0c07d pnfsblock: set read/write tk_status to pnfs_error
60d5135 pnfsblock: move find lock page logic out of bl_write_pagelist
657c2f4 pnfsblock: acquire im_lock in _preload_range
e5b35df pnfsblock: cleanup bl_mark_sectors_init

I never saw 8,9 and can't find them in the list archive.

Re: [PATCH 0/9] pnfsblock patches

[Boaz Harrosh]

On 11/29/2011 02:58 PM, Jim Rees wrote:
> Boaz Harrosh wrote:
> 
>   On 12/02/2011 08:46 PM, Peng Tao wrote:
>   > Hi, Trond,
>   > 
>   > Following are some bugfix and improvements for blocklayout driver. All have been
>   > sent to the list before and have been tested for several weeks.
>   > 
>   
>   I never got 9 patches in the mail.
>   
>   I only have 1,3,4,5,6,7
>   
>   Do you have them on a gitweb, or re-post 2,8,9
> 
> 1-7 are in benny's tree:
> 
> % git log --oneline -7 benny/pnfs-block
> ec11faf pnfsblock: alloc short extent before submit bio
> 7c93c37 pnfsblock: clean up _add_entry
> 85e8c84 pnfsblock: remove rpc_call_ops from struct parallel_io
> ab0c07d pnfsblock: set read/write tk_status to pnfs_error
> 60d5135 pnfsblock: move find lock page logic out of bl_write_pagelist
> 657c2f4 pnfsblock: acquire im_lock in _preload_range
> e5b35df pnfsblock: cleanup bl_mark_sectors_init
> 
> I never saw 8,9 and can't find them in the list archive.

Actually I wanted 9. I'm old and senile but I did not remember
I ever saw it so I was wondering.

We know their names from [0/9]:
  pnfsblock: don't spinlock when freeing block_dev
  pnfsblock: limit bio page count

Thanks
Heart

RE: [PATCH 0/9] pnfsblock patches

[tao.peng]

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[PATCH 1/9] pnfsblock: cleanup bl_mark_sectors_init

[Peng Tao]

It does not need to manipulate on partial initialized blocks.
Writeback code takes care of it.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |    6 +--
 fs/nfs/blocklayout/blocklayout.h |    3 +-
 fs/nfs/blocklayout/extents.c     |   76 ++-----------------------------------
 3 files changed, 8 insertions(+), 77 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 281ae95..4ced0b0 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -571,8 +571,7 @@ fill_invalid_ext:
 			unlock_page(page);
 
 			ret = bl_mark_sectors_init(be->be_inval, isect,
-						       PAGE_CACHE_SECTORS,
-						       NULL);
+						       PAGE_CACHE_SECTORS);
 			if (unlikely(ret)) {
 				dprintk("%s bl_mark_sectors_init fail %d\n",
 					__func__, ret);
@@ -621,8 +620,7 @@ next_page:
 		}
 		if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
 			ret = bl_mark_sectors_init(be->be_inval, isect,
-						       PAGE_CACHE_SECTORS,
-						       NULL);
+						       PAGE_CACHE_SECTORS);
 			if (unlikely(ret)) {
 				dprintk("%s bl_mark_sectors_init fail %d\n",
 					__func__, ret);
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 42acf7e..60728ac 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -186,8 +186,7 @@ struct pnfs_block_extent *
 bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect,
 		struct pnfs_block_extent **cow_read);
 int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
-			     sector_t offset, sector_t length,
-			     sector_t **pages);
+			     sector_t offset, sector_t length);
 void bl_put_extent(struct pnfs_block_extent *be);
 struct pnfs_block_extent *bl_alloc_extent(void);
 int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect);
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index 19fa7b0..0fc1321 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -179,33 +179,6 @@ static int _preload_range(struct my_tree *tree, u64 offset, u64 length)
 	return status;
 }
 
-static void set_needs_init(sector_t *array, sector_t offset)
-{
-	sector_t *p = array;
-
-	dprintk("%s enter\n", __func__);
-	if (!p)
-		return;
-	while (*p < offset)
-		p++;
-	if (*p == offset)
-		return;
-	else if (*p == ~0) {
-		*p++ = offset;
-		*p = ~0;
-		return;
-	} else {
-		sector_t *save = p;
-		dprintk("%s Adding %llu\n", __func__, (u64)offset);
-		while (*p != ~0)
-			p++;
-		p++;
-		memmove(save + 1, save, (char *)p - (char *)save);
-		*save = offset;
-		return;
-	}
-}
-
 /* We are relying on page lock to serialize this */
 int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect)
 {
@@ -261,28 +234,15 @@ static int is_range_written(struct pnfs_inval_markings *marks,
 
 /* Marks sectors in [offest, offset_length) as having been initialized.
  * All lengths are step-aligned, where step is min(pagesize, blocksize).
- * Notes where partial block is initialized, and helps prepare it for
- * complete initialization later.
+ * Currently assumes offset is page-aligned
  */
-/* Currently assumes offset is page-aligned */
 int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
-			     sector_t offset, sector_t length,
-			     sector_t **pages)
+			     sector_t offset, sector_t length)
 {
-	sector_t s, start, end;
-	sector_t *array = NULL; /* Pages to mark */
+	sector_t start, end;
 
 	dprintk("%s(offset=%llu,len=%llu) enter\n",
 		__func__, (u64)offset, (u64)length);
-	s = max((sector_t) 3,
-		2 * (marks->im_block_size / (PAGE_CACHE_SECTORS)));
-	dprintk("%s set max=%llu\n", __func__, (u64)s);
-	if (pages) {
-		array = kmalloc(s * sizeof(sector_t), GFP_NOFS);
-		if (!array)
-			goto outerr;
-		array[0] = ~0;
-	}
 
 	start = normalize(offset, marks->im_block_size);
 	end = normalize_up(offset + length, marks->im_block_size);
@@ -290,41 +250,15 @@ int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
 		goto outerr;
 
 	spin_lock(&marks->im_lock);
-
-	for (s = normalize_up(start, PAGE_CACHE_SECTORS);
-	     s < offset; s += PAGE_CACHE_SECTORS) {
-		dprintk("%s pre-area pages\n", __func__);
-		/* Portion of used block is not initialized */
-		if (!_has_tag(&marks->im_tree, s, EXTENT_INITIALIZED))
-			set_needs_init(array, s);
-	}
 	if (_set_range(&marks->im_tree, EXTENT_INITIALIZED, offset, length))
 		goto out_unlock;
-	for (s = normalize_up(offset + length, PAGE_CACHE_SECTORS);
-	     s < end; s += PAGE_CACHE_SECTORS) {
-		dprintk("%s post-area pages\n", __func__);
-		if (!_has_tag(&marks->im_tree, s, EXTENT_INITIALIZED))
-			set_needs_init(array, s);
-	}
-
 	spin_unlock(&marks->im_lock);
 
-	if (pages) {
-		if (array[0] == ~0) {
-			kfree(array);
-			*pages = NULL;
-		} else
-			*pages = array;
-	}
 	return 0;
 
- out_unlock:
+out_unlock:
 	spin_unlock(&marks->im_lock);
- outerr:
-	if (pages) {
-		kfree(array);
-		*pages = NULL;
-	}
+outerr:
 	return -ENOMEM;
 }
 
-- 
1.7.1.262.g5ef3d

[PATCH 3/9] pnfsblock: move find lock page logic out of bl_write_pagelist

[Peng Tao]

Also avoid unnecessary lock_page if page is handled by others.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |   78 ++++++++++++++++++++++++++------------
 1 files changed, 54 insertions(+), 24 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 4ced0b0..c83ad70 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -484,6 +484,55 @@ cleanup:
 	return ret;
 }
 
+/* Find or create a zeroing page marked being writeback.
+ * Return ERR_PTR on error, NULL to indicate skip this page and page itself
+ * to indicate write out.
+ */
+static struct page *
+bl_find_get_zeroing_page(struct inode *inode, pgoff_t index,
+			struct pnfs_block_extent *cow_read)
+{
+	struct page *page;
+	int locked = 0;
+	page = find_get_page(inode->i_mapping, index);
+	if (page)
+		goto check_page;
+
+	page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
+	if (unlikely(!page)) {
+		dprintk("%s oom\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+	locked = 1;
+
+check_page:
+	/* PageDirty: Other will write this out
+	 * PageWriteback: Other is writing this out
+	 * PageUptodate: It was read before
+	 */
+	if (PageDirty(page) || PageWriteback(page)) {
+		print_page(page);
+		if (locked)
+			unlock_page(page);
+		page_cache_release(page);
+		return NULL;
+	}
+
+	if (!locked) {
+		lock_page(page);
+		locked = 1;
+		goto check_page;
+	}
+	if (!PageUptodate(page)) {
+		/* New page, readin or zero it */
+		init_page_for_write(page, cow_read);
+	}
+	set_page_writeback(page);
+	unlock_page(page);
+
+	return page;
+}
+
 static enum pnfs_try_status
 bl_write_pagelist(struct nfs_write_data *wdata, int sync)
 {
@@ -543,32 +592,13 @@ fill_invalid_ext:
 			dprintk("%s zero %dth page: index %lu isect %llu\n",
 				__func__, npg_zero, index,
 				(unsigned long long)isect);
-			page =
-			    find_or_create_page(wdata->inode->i_mapping, index,
-						GFP_NOFS);
-			if (!page) {
-				dprintk("%s oom\n", __func__);
-				wdata->pnfs_error = -ENOMEM;
+			page = bl_find_get_zeroing_page(wdata->inode, index,
+							cow_read);
+			if (unlikely(IS_ERR(page))) {
+				wdata->pnfs_error = PTR_ERR(page);
 				goto out;
-			}
-
-			/* PageDirty: Other will write this out
-			 * PageWriteback: Other is writing this out
-			 * PageUptodate: It was read before
-			 * sector_initialized: already written out
-			 */
-			if (PageDirty(page) || PageWriteback(page)) {
-				print_page(page);
-				unlock_page(page);
-				page_cache_release(page);
+			} else if (page == NULL)
 				goto next_page;
-			}
-			if (!PageUptodate(page)) {
-				/* New page, readin or zero it */
-				init_page_for_write(page, cow_read);
-			}
-			set_page_writeback(page);
-			unlock_page(page);
 
 			ret = bl_mark_sectors_init(be->be_inval, isect,
 						       PAGE_CACHE_SECTORS);
-- 
1.7.1.262.g5ef3d

[PATCH 4/9] pnfsblock: set read/write tk_status to pnfs_error

[Peng Tao]

To pass the IO status to upper layer.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index c83ad70..883bb27 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -216,6 +216,7 @@ bl_end_par_io_read(void *data)
 {
 	struct nfs_read_data *rdata = data;
 
+	rdata->task.tk_status = rdata->pnfs_error;
 	INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup);
 	schedule_work(&rdata->task.u.tk_work);
 }
@@ -405,7 +406,7 @@ static void bl_end_par_io_write(void *data)
 {
 	struct nfs_write_data *wdata = data;
 
-	wdata->task.tk_status = 0;
+	wdata->task.tk_status = wdata->pnfs_error;
 	wdata->verf.committed = NFS_FILE_SYNC;
 	INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
 	schedule_work(&wdata->task.u.tk_work);
-- 
1.7.1.262.g5ef3d

[PATCH 5/9] pnfsblock: remove rpc_call_ops from struct parallel_io

[Peng Tao]

block layout can just make use of generic read/write_done.

Signed-off-by: Peng Tao <bergwolf@gmail.com>
---
 fs/nfs/blocklayout/blocklayout.c |   13 -------------
 1 files changed, 0 insertions(+), 13 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 883bb27..7fc69c9 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -90,7 +90,6 @@ static int is_writable(struct pnfs_block_extent *be, sector_t isect)
  */
 struct parallel_io {
 	struct kref refcnt;
-	struct rpc_call_ops call_ops;
 	void (*pnfs_callback) (void *data);
 	void *data;
 };
@@ -221,14 +220,6 @@ bl_end_par_io_read(void *data)
 	schedule_work(&rdata->task.u.tk_work);
 }
 
-/* We don't want normal .rpc_call_done callback used, so we replace it
- * with this stub.
- */
-static void bl_rpc_do_nothing(struct rpc_task *task, void *calldata)
-{
-	return;
-}
-
 static enum pnfs_try_status
 bl_read_pagelist(struct nfs_read_data *rdata)
 {
@@ -248,8 +239,6 @@ bl_read_pagelist(struct nfs_read_data *rdata)
 	par = alloc_parallel(rdata);
 	if (!par)
 		goto use_mds;
-	par->call_ops = *rdata->mds_ops;
-	par->call_ops.rpc_call_done = bl_rpc_do_nothing;
 	par->pnfs_callback = bl_end_par_io_read;
 	/* At this point, we can no longer jump to use_mds */
 
@@ -559,8 +548,6 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
 	par = alloc_parallel(wdata);
 	if (!par)
 		return PNFS_NOT_ATTEMPTED;
-	par->call_ops = *wdata->mds_ops;
-	par->call_ops.rpc_call_done = bl_rpc_do_nothing;
 	par->pnfs_callback = bl_end_par_io_write;
 	/* At this point, have to be more careful with error handling */
 
-- 
1.7.1.262.g5ef3d

[PATCH 6/9] pnfsblock: clean up _add_entry

[Peng Tao]

It is wrong to kmalloc in _add_entry() as it is inside
spinlock. memory should be already allocated _add_entry() is called.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/extents.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)

diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index f383524..d0f52ed 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -110,13 +110,7 @@ static int _add_entry(struct my_tree *tree, u64 s, int32_t tag,
 		return 0;
 	} else {
 		struct pnfs_inval_tracking *new;
-		if (storage)
-			new = storage;
-		else {
-			new = kmalloc(sizeof(*new), GFP_NOFS);
-			if (!new)
-				return -ENOMEM;
-		}
+		new = storage;
 		new->it_sector = s;
 		new->it_tags = (1 << tag);
 		list_add(&new->it_link, &pos->it_link);
-- 
1.7.1.262.g5ef3d

[PATCH 7/9] pnfsblock: alloc short extent before submit bio

[Peng Tao]

As discussed earlier, it is better for block client to allocate memory for
tracking extents state before submitting bio. So the patch does it by allocating
a short_extent for every INVALID extent touched by write pagelist and for
every zeroing page we created, saving them in layout header. Then in end_io we
can just use them to create commit list items and avoid memory allocation there.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |   74 ++++++++++++++++++++++++++-------
 fs/nfs/blocklayout/blocklayout.h |    9 ++++-
 fs/nfs/blocklayout/extents.c     |   85 +++++++++++++++++++++++++++++---------
 3 files changed, 131 insertions(+), 37 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 7fc69c9..1dd2983 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -90,8 +90,9 @@ static int is_writable(struct pnfs_block_extent *be, sector_t isect)
  */
 struct parallel_io {
 	struct kref refcnt;
-	void (*pnfs_callback) (void *data);
+	void (*pnfs_callback) (void *data, int num_se);
 	void *data;
+	int bse_count;
 };
 
 static inline struct parallel_io *alloc_parallel(void *data)
@@ -102,6 +103,7 @@ static inline struct parallel_io *alloc_parallel(void *data)
 	if (rv) {
 		rv->data = data;
 		kref_init(&rv->refcnt);
+		rv->bse_count = 0;
 	}
 	return rv;
 }
@@ -116,7 +118,7 @@ static void destroy_parallel(struct kref *kref)
 	struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
 
 	dprintk("%s enter\n", __func__);
-	p->pnfs_callback(p->data);
+	p->pnfs_callback(p->data, p->bse_count);
 	kfree(p);
 }
 
@@ -211,7 +213,7 @@ static void bl_read_cleanup(struct work_struct *work)
 }
 
 static void
-bl_end_par_io_read(void *data)
+bl_end_par_io_read(void *data, int unused)
 {
 	struct nfs_read_data *rdata = data;
 
@@ -312,6 +314,7 @@ static void mark_extents_written(struct pnfs_block_layout *bl,
 {
 	sector_t isect, end;
 	struct pnfs_block_extent *be;
+	struct pnfs_block_short_extent *se;
 
 	dprintk("%s(%llu, %u)\n", __func__, offset, count);
 	if (count == 0)
@@ -324,8 +327,11 @@ static void mark_extents_written(struct pnfs_block_layout *bl,
 		be = bl_find_get_extent(bl, isect, NULL);
 		BUG_ON(!be); /* FIXME */
 		len = min(end, be->be_f_offset + be->be_length) - isect;
-		if (be->be_state == PNFS_BLOCK_INVALID_DATA)
-			bl_mark_for_commit(be, isect, len); /* What if fails? */
+		if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
+			se = bl_pop_one_short_extent(be->be_inval);
+			BUG_ON(!se);
+			bl_mark_for_commit(be, isect, len, se);
+		}
 		isect += len;
 		bl_put_extent(be);
 	}
@@ -347,7 +353,8 @@ static void bl_end_io_write_zero(struct bio *bio, int err)
 		end_page_writeback(page);
 		page_cache_release(page);
 	} while (bvec >= bio->bi_io_vec);
-	if (!uptodate) {
+
+	if (unlikely(!uptodate)) {
 		if (!wdata->pnfs_error)
 			wdata->pnfs_error = -EIO;
 		pnfs_set_lo_fail(wdata->lseg);
@@ -356,7 +363,6 @@ static void bl_end_io_write_zero(struct bio *bio, int err)
 	put_parallel(par);
 }
 
-/* This is basically copied from mpage_end_io_read */
 static void bl_end_io_write(struct bio *bio, int err)
 {
 	struct parallel_io *par = bio->bi_private;
@@ -382,7 +388,7 @@ static void bl_write_cleanup(struct work_struct *work)
 	dprintk("%s enter\n", __func__);
 	task = container_of(work, struct rpc_task, u.tk_work);
 	wdata = container_of(task, struct nfs_write_data, task);
-	if (!wdata->pnfs_error) {
+	if (likely(!wdata->pnfs_error)) {
 		/* Marks for LAYOUTCOMMIT */
 		mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
 				     wdata->args.offset, wdata->args.count);
@@ -391,10 +397,15 @@ static void bl_write_cleanup(struct work_struct *work)
 }
 
 /* Called when last of bios associated with a bl_write_pagelist call finishes */
-static void bl_end_par_io_write(void *data)
+static void bl_end_par_io_write(void *data, int num_se)
 {
 	struct nfs_write_data *wdata = data;
 
+	if (unlikely(wdata->pnfs_error)) {
+		bl_free_short_extents(&BLK_LSEG2EXT(wdata->lseg)->bl_inval,
+					num_se);
+	}
+
 	wdata->task.tk_status = wdata->pnfs_error;
 	wdata->verf.committed = NFS_FILE_SYNC;
 	INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
@@ -547,7 +558,7 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
 	 */
 	par = alloc_parallel(wdata);
 	if (!par)
-		return PNFS_NOT_ATTEMPTED;
+		goto out_mds;
 	par->pnfs_callback = bl_end_par_io_write;
 	/* At this point, have to be more careful with error handling */
 
@@ -555,12 +566,15 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
 	be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg), isect, &cow_read);
 	if (!be || !is_writable(be, isect)) {
 		dprintk("%s no matching extents!\n", __func__);
-		wdata->pnfs_error = -EINVAL;
-		goto out;
+		goto out_mds;
 	}
 
 	/* First page inside INVALID extent */
 	if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
+		if (likely(!bl_push_one_short_extent(be->be_inval)))
+			par->bse_count++;
+		else
+			goto out_mds;
 		temp = offset >> PAGE_CACHE_SHIFT;
 		npg_zero = do_div(temp, npg_per_block);
 		isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) &
@@ -598,6 +612,19 @@ fill_invalid_ext:
 				wdata->pnfs_error = ret;
 				goto out;
 			}
+			if (likely(!bl_push_one_short_extent(be->be_inval)))
+				par->bse_count++;
+			else {
+				end_page_writeback(page);
+				page_cache_release(page);
+				wdata->pnfs_error = -ENOMEM;
+				goto out;
+			}
+			/* FIXME: This should be done in bi_end_io */
+			mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
+					     page->index << PAGE_CACHE_SHIFT,
+					     PAGE_CACHE_SIZE);
+
 			bio = bl_add_page_to_bio(bio, npg_zero, WRITE,
 						 isect, page, be,
 						 bl_end_io_write_zero, par);
@@ -606,10 +633,6 @@ fill_invalid_ext:
 				bio = NULL;
 				goto out;
 			}
-			/* FIXME: This should be done in bi_end_io */
-			mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
-					     page->index << PAGE_CACHE_SHIFT,
-					     PAGE_CACHE_SIZE);
 next_page:
 			isect += PAGE_CACHE_SECTORS;
 			extent_length -= PAGE_CACHE_SECTORS;
@@ -633,6 +656,15 @@ next_page:
 				wdata->pnfs_error = -EINVAL;
 				goto out;
 			}
+			if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
+				if (likely(!bl_push_one_short_extent(
+								be->be_inval)))
+					par->bse_count++;
+				else {
+					wdata->pnfs_error = -ENOMEM;
+					goto out;
+				}
+			}
 			extent_length = be->be_length -
 			    (isect - be->be_f_offset);
 		}
@@ -680,6 +712,10 @@ out:
 	bl_submit_bio(WRITE, bio);
 	put_parallel(par);
 	return PNFS_ATTEMPTED;
+out_mds:
+	bl_put_extent(be);
+	kfree(par);
+	return PNFS_NOT_ATTEMPTED;
 }
 
 /* FIXME - range ignored */
@@ -706,11 +742,17 @@ static void
 release_inval_marks(struct pnfs_inval_markings *marks)
 {
 	struct pnfs_inval_tracking *pos, *temp;
+	struct pnfs_block_short_extent *se, *stemp;
 
 	list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) {
 		list_del(&pos->it_link);
 		kfree(pos);
 	}
+
+	list_for_each_entry_safe(se, stemp, &marks->im_extents, bse_node) {
+		list_del(&se->bse_node);
+		kfree(se);
+	}
 	return;
 }
 
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 60728ac..e31a2df 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -70,6 +70,7 @@ struct pnfs_inval_markings {
 	spinlock_t	im_lock;
 	struct my_tree	im_tree;	/* Sectors that need LAYOUTCOMMIT */
 	sector_t	im_block_size;	/* Server blocksize in sectors */
+	struct list_head im_extents;	/* Short extents for INVAL->RW conversion */
 };
 
 struct pnfs_inval_tracking {
@@ -105,6 +106,7 @@ BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
 {
 	spin_lock_init(&marks->im_lock);
 	INIT_LIST_HEAD(&marks->im_tree.mtt_stub);
+	INIT_LIST_HEAD(&marks->im_extents);
 	marks->im_block_size = blocksize;
 	marks->im_tree.mtt_step_size = min((sector_t)PAGE_CACHE_SECTORS,
 					   blocksize);
@@ -199,6 +201,11 @@ void clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl,
 int bl_add_merge_extent(struct pnfs_block_layout *bl,
 			 struct pnfs_block_extent *new);
 int bl_mark_for_commit(struct pnfs_block_extent *be,
-			sector_t offset, sector_t length);
+			sector_t offset, sector_t length,
+			struct pnfs_block_short_extent *new);
+int bl_push_one_short_extent(struct pnfs_inval_markings *marks);
+struct pnfs_block_short_extent *
+bl_pop_one_short_extent(struct pnfs_inval_markings *marks);
+void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free);
 
 #endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c
index d0f52ed..1abac09 100644
--- a/fs/nfs/blocklayout/extents.c
+++ b/fs/nfs/blocklayout/extents.c
@@ -157,10 +157,10 @@ static int _preload_range(struct pnfs_inval_markings *marks,
 			goto out_cleanup;
 	}
 
-	spin_lock(&marks->im_lock);
+	spin_lock_bh(&marks->im_lock);
 	for (s = start; s < end; s += tree->mtt_step_size)
 		used += _add_entry(tree, s, INTERNAL_EXISTS, storage[used]);
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 
 	status = 0;
 
@@ -179,9 +179,9 @@ int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect)
 {
 	int rv;
 
-	spin_lock(&marks->im_lock);
+	spin_lock_bh(&marks->im_lock);
 	rv = _has_tag(&marks->im_tree, isect, EXTENT_INITIALIZED);
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 	return rv;
 }
 
@@ -221,9 +221,9 @@ static int is_range_written(struct pnfs_inval_markings *marks,
 {
 	int rv;
 
-	spin_lock(&marks->im_lock);
+	spin_lock_bh(&marks->im_lock);
 	rv = _range_has_tag(&marks->im_tree, start, end, EXTENT_WRITTEN);
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 	return rv;
 }
 
@@ -244,15 +244,15 @@ int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
 	if (_preload_range(marks, start, end - start))
 		goto outerr;
 
-	spin_lock(&marks->im_lock);
+	spin_lock_bh(&marks->im_lock);
 	if (_set_range(&marks->im_tree, EXTENT_INITIALIZED, offset, length))
 		goto out_unlock;
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 
 	return 0;
 
 out_unlock:
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 outerr:
 	return -ENOMEM;
 }
@@ -267,9 +267,9 @@ static int mark_written_sectors(struct pnfs_inval_markings *marks,
 
 	dprintk("%s(offset=%llu,len=%llu) enter\n", __func__,
 		(u64)offset, (u64)length);
-	spin_lock(&marks->im_lock);
+	spin_lock_bh(&marks->im_lock);
 	status = _set_range(&marks->im_tree, EXTENT_WRITTEN, offset, length);
-	spin_unlock(&marks->im_lock);
+	spin_unlock_bh(&marks->im_lock);
 	return status;
 }
 
@@ -369,20 +369,18 @@ static void add_to_commitlist(struct pnfs_block_layout *bl,
 
 /* Note the range described by offset, length is guaranteed to be contained
  * within be.
+ * new will be freed, either by this function or add_to_commitlist if they
+ * decide not to use it, or after LAYOUTCOMMIT uses it in the commitlist.
  */
 int bl_mark_for_commit(struct pnfs_block_extent *be,
-		    sector_t offset, sector_t length)
+		    sector_t offset, sector_t length,
+		    struct pnfs_block_short_extent *new)
 {
 	sector_t new_end, end = offset + length;
-	struct pnfs_block_short_extent *new;
 	struct pnfs_block_layout *bl = container_of(be->be_inval,
 						    struct pnfs_block_layout,
 						    bl_inval);
 
-	new = kmalloc(sizeof(*new), GFP_NOFS);
-	if (!new)
-		return -ENOMEM;
-
 	mark_written_sectors(be->be_inval, offset, length);
 	/* We want to add the range to commit list, but it must be
 	 * block-normalized, and verified that the normalized range has
@@ -412,9 +410,6 @@ int bl_mark_for_commit(struct pnfs_block_extent *be,
 	new->bse_mdev = be->be_mdev;
 
 	spin_lock(&bl->bl_ext_lock);
-	/* new will be freed, either by add_to_commitlist if it decides not
-	 * to use it, or after LAYOUTCOMMIT uses it in the commitlist.
-	 */
 	add_to_commitlist(bl, new);
 	spin_unlock(&bl->bl_ext_lock);
 	return 0;
@@ -862,3 +857,53 @@ clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl,
 		}
 	}
 }
+
+int bl_push_one_short_extent(struct pnfs_inval_markings *marks)
+{
+	struct pnfs_block_short_extent *new;
+
+	new = kmalloc(sizeof(*new), GFP_NOFS);
+	if (unlikely(!new))
+		return -ENOMEM;
+
+	spin_lock_bh(&marks->im_lock);
+	list_add(&new->bse_node, &marks->im_extents);
+	spin_unlock_bh(&marks->im_lock);
+
+	return 0;
+}
+
+struct pnfs_block_short_extent *
+bl_pop_one_short_extent(struct pnfs_inval_markings *marks)
+{
+	struct pnfs_block_short_extent *rv = NULL;
+
+	spin_lock_bh(&marks->im_lock);
+	if (!list_empty(&marks->im_extents)) {
+		rv = list_entry((&marks->im_extents)->next,
+				struct pnfs_block_short_extent, bse_node);
+		list_del_init(&rv->bse_node);
+	}
+	spin_unlock_bh(&marks->im_lock);
+
+	return rv;
+}
+
+void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free)
+{
+	struct pnfs_block_short_extent *se = NULL, *tmp;
+
+	if (num_to_free <= 0)
+		return;
+
+	spin_lock(&marks->im_lock);
+	list_for_each_entry_safe(se, tmp, &marks->im_extents, bse_node) {
+		list_del(&se->bse_node);
+		kfree(se);
+		if (--num_to_free == 0)
+			break;
+	}
+	spin_unlock(&marks->im_lock);
+
+	BUG_ON(num_to_free > 0);
+}
-- 
1.7.1.262.g5ef3d