NFS: move pnfs layouts to nfs_server structure
diff mbox

Message ID 1303922649-25478-1-git-send-email-dros@netapp.com
State New, archived
Headers show

Commit Message

Weston Andros Adamson April 27, 2011, 4:44 p.m. UTC
Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
instead of per struct nfs_client, which may have multiple FSIDs associated
with it.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
---
 fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
 fs/nfs/client.c           |    6 ++--
 fs/nfs/pnfs.c             |   13 +++++++--
 include/linux/nfs_fs_sb.h |    2 +-
 4 files changed, 51 insertions(+), 30 deletions(-)

Comments

Trond Myklebust April 27, 2011, 6 p.m. UTC | #1
On Wed, 2011-04-27 at 12:44 -0400, Weston Andros Adamson wrote:
> Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
> instead of per struct nfs_client, which may have multiple FSIDs associated
> with it.
> 
> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
> ---
>  fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
>  fs/nfs/client.c           |    6 ++--
>  fs/nfs/pnfs.c             |   13 +++++++--
>  include/linux/nfs_fs_sb.h |    2 +-
>  4 files changed, 51 insertions(+), 30 deletions(-)
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index 139be96..f72fd39 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -188,9 +188,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
>  	cred = rpc_lookup_machine_cred();
>  	if (!IS_ERR(cred))
>  		clp->cl_machine_cred = cred;
> -#if defined(CONFIG_NFS_V4_1)
> -	INIT_LIST_HEAD(&clp->cl_layouts);
> -#endif
>  	nfs_fscache_get_client_cookie(clp);
>  
>  	return clp;
> @@ -1060,6 +1057,9 @@ static struct nfs_server *nfs_alloc_server(void)
>  	INIT_LIST_HEAD(&server->client_link);
>  	INIT_LIST_HEAD(&server->master_link);
>  	INIT_LIST_HEAD(&server->delegations);
> +#if defined(CONFIG_NFS_V4_1)
> +	INIT_LIST_HEAD(&server->layouts);
> +#endif

Can we please just drop the #ifdef here?

>  	atomic_set(&server->active, 0);

Otherwise it looks good to me...
Benny Halevy April 27, 2011, 6:51 p.m. UTC | #2
On 2011-04-27 19:44, Weston Andros Adamson wrote:
> Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
> instead of per struct nfs_client, which may have multiple FSIDs associated
> with it.
> 
> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
> ---
>  fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
>  fs/nfs/client.c           |    6 ++--
>  fs/nfs/pnfs.c             |   13 +++++++--
>  include/linux/nfs_fs_sb.h |    2 +-
>  4 files changed, 51 insertions(+), 30 deletions(-)
> 
> diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
> index 2f41dcce..3964467 100644
> --- a/fs/nfs/callback_proc.c
> +++ b/fs/nfs/callback_proc.c
> @@ -111,6 +111,7 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
>  static u32 initiate_file_draining(struct nfs_client *clp,
>  				  struct cb_layoutrecallargs *args)
>  {
> +	struct nfs_server *server;
>  	struct pnfs_layout_hdr *lo;
>  	struct inode *ino;
>  	bool found = false;
> @@ -118,21 +119,28 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>  	LIST_HEAD(free_me_list);
>  
>  	spin_lock(&clp->cl_lock);
> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
> -		if (nfs_compare_fh(&args->cbl_fh,
> -				   &NFS_I(lo->plh_inode)->fh))
> -			continue;
> -		ino = igrab(lo->plh_inode);
> -		if (!ino)
> -			continue;
> -		found = true;
> -		/* Without this, layout can be freed as soon
> -		 * as we release cl_lock.
> -		 */
> -		get_layout_hdr(lo);
> -		break;
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
> +			if (nfs_compare_fh(&args->cbl_fh,
> +					   &NFS_I(lo->plh_inode)->fh))
> +				continue;
> +			ino = igrab(lo->plh_inode);
> +			if (!ino)
> +				continue;
> +			found = true;
> +			/* Without this, layout can be freed as soon
> +			 * as we release cl_lock.
> +			 */
> +			get_layout_hdr(lo);
> +			break;
> +		}
> +		if (found)
> +			break;
>  	}
> +	rcu_read_unlock();
>  	spin_unlock(&clp->cl_lock);
> +
>  	if (!found)
>  		return NFS4ERR_NOMATCHING_LAYOUT;
>  
> @@ -154,6 +162,7 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>  static u32 initiate_bulk_draining(struct nfs_client *clp,
>  				  struct cb_layoutrecallargs *args)
>  {
> +	struct nfs_server *server;
>  	struct pnfs_layout_hdr *lo;
>  	struct inode *ino;
>  	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
> @@ -167,18 +176,23 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
>  	};
>  
>  	spin_lock(&clp->cl_lock);
> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
> -		if ((args->cbl_recall_type == RETURN_FSID) &&
> -		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
> -			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
> -			continue;
> -		if (!igrab(lo->plh_inode))
> -			continue;
> -		get_layout_hdr(lo);
> -		BUG_ON(!list_empty(&lo->plh_bulk_recall));
> -		list_add(&lo->plh_bulk_recall, &recall_list);
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
> +			if ((args->cbl_recall_type == RETURN_FSID) &&
> +			    memcmp(&server->fsid, &args->cbl_fsid,
> +				   sizeof(struct nfs_fsid)))
> +				continue;

This condition can be popped up to the outer loop now...
(or break rather than continue)

Benny

> +			if (!igrab(lo->plh_inode))
> +				continue;
> +			get_layout_hdr(lo);
> +			BUG_ON(!list_empty(&lo->plh_bulk_recall));
> +			list_add(&lo->plh_bulk_recall, &recall_list);
> +		}
>  	}
> +	rcu_read_unlock();
>  	spin_unlock(&clp->cl_lock);
> +
>  	list_for_each_entry_safe(lo, tmp,
>  				 &recall_list, plh_bulk_recall) {
>  		ino = lo->plh_inode;
> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
> index 139be96..f72fd39 100644
> --- a/fs/nfs/client.c
> +++ b/fs/nfs/client.c
> @@ -188,9 +188,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
>  	cred = rpc_lookup_machine_cred();
>  	if (!IS_ERR(cred))
>  		clp->cl_machine_cred = cred;
> -#if defined(CONFIG_NFS_V4_1)
> -	INIT_LIST_HEAD(&clp->cl_layouts);
> -#endif
>  	nfs_fscache_get_client_cookie(clp);
>  
>  	return clp;
> @@ -1060,6 +1057,9 @@ static struct nfs_server *nfs_alloc_server(void)
>  	INIT_LIST_HEAD(&server->client_link);
>  	INIT_LIST_HEAD(&server->master_link);
>  	INIT_LIST_HEAD(&server->delegations);
> +#if defined(CONFIG_NFS_V4_1)
> +	INIT_LIST_HEAD(&server->layouts);
> +#endif
>  
>  	atomic_set(&server->active, 0);
>  
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index ff681ab..6a5d0a4 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -371,11 +371,17 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
>  void
>  pnfs_destroy_all_layouts(struct nfs_client *clp)
>  {
> +	struct nfs_server *server;
>  	struct pnfs_layout_hdr *lo;
>  	LIST_HEAD(tmp_list);
>  
>  	spin_lock(&clp->cl_lock);
> -	list_splice_init(&clp->cl_layouts, &tmp_list);
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
> +		if (!list_empty(&server->layouts))
> +			list_splice_init(&server->layouts, &tmp_list);
> +	}
> +	rcu_read_unlock();
>  	spin_unlock(&clp->cl_lock);
>  
>  	while (!list_empty(&tmp_list)) {
> @@ -759,7 +765,8 @@ pnfs_update_layout(struct inode *ino,
>  		   enum pnfs_iomode iomode)
>  {
>  	struct nfs_inode *nfsi = NFS_I(ino);
> -	struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
> +	struct nfs_server *server = NFS_SERVER(ino);
> +	struct nfs_client *clp = server->nfs_client;
>  	struct pnfs_layout_hdr *lo;
>  	struct pnfs_layout_segment *lseg = NULL;
>  	bool first = false;
> @@ -803,7 +810,7 @@ pnfs_update_layout(struct inode *ino,
>  		 */
>  		spin_lock(&clp->cl_lock);
>  		BUG_ON(!list_empty(&lo->plh_layouts));
> -		list_add_tail(&lo->plh_layouts, &clp->cl_layouts);
> +		list_add_tail(&lo->plh_layouts, &server->layouts);
>  		spin_unlock(&clp->cl_lock);
>  	}
>  
> diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
> index 87694ca..f321015 100644
> --- a/include/linux/nfs_fs_sb.h
> +++ b/include/linux/nfs_fs_sb.h
> @@ -77,7 +77,6 @@ struct nfs_client {
>  	/* The flags used for obtaining the clientid during EXCHANGE_ID */
>  	u32			cl_exchange_flags;
>  	struct nfs4_session	*cl_session; 	/* sharred session */
> -	struct list_head	cl_layouts;
>  #endif /* CONFIG_NFS_V4 */
>  
>  #ifdef CONFIG_NFS_FSCACHE
> @@ -148,6 +147,7 @@ struct nfs_server {
>  	struct rb_root		state_owners;
>  	struct rb_root		openowner_id;
>  	struct rb_root		lockowner_id;
> +	struct list_head	layouts;
>  #endif
>  	struct list_head	delegations;
>  	void (*destroy)(struct nfs_server *);

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Weston Andros Adamson April 27, 2011, 6:56 p.m. UTC | #3
On Apr 27, 2011, at 2:51 PM, Benny Halevy wrote:

> On 2011-04-27 19:44, Weston Andros Adamson wrote:
>> Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
>> instead of per struct nfs_client, which may have multiple FSIDs associated
>> with it.
>> 
>> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
>> ---
>> fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
>> fs/nfs/client.c           |    6 ++--
>> fs/nfs/pnfs.c             |   13 +++++++--
>> include/linux/nfs_fs_sb.h |    2 +-
>> 4 files changed, 51 insertions(+), 30 deletions(-)
>> 
>> diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
>> index 2f41dcce..3964467 100644
>> --- a/fs/nfs/callback_proc.c
>> +++ b/fs/nfs/callback_proc.c
>> @@ -111,6 +111,7 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
>> static u32 initiate_file_draining(struct nfs_client *clp,
>> 				  struct cb_layoutrecallargs *args)
>> {
>> +	struct nfs_server *server;
>> 	struct pnfs_layout_hdr *lo;
>> 	struct inode *ino;
>> 	bool found = false;
>> @@ -118,21 +119,28 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>> 	LIST_HEAD(free_me_list);
>> 
>> 	spin_lock(&clp->cl_lock);
>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>> -		if (nfs_compare_fh(&args->cbl_fh,
>> -				   &NFS_I(lo->plh_inode)->fh))
>> -			continue;
>> -		ino = igrab(lo->plh_inode);
>> -		if (!ino)
>> -			continue;
>> -		found = true;
>> -		/* Without this, layout can be freed as soon
>> -		 * as we release cl_lock.
>> -		 */
>> -		get_layout_hdr(lo);
>> -		break;
>> +	rcu_read_lock();
>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>> +			if (nfs_compare_fh(&args->cbl_fh,
>> +					   &NFS_I(lo->plh_inode)->fh))
>> +				continue;
>> +			ino = igrab(lo->plh_inode);
>> +			if (!ino)
>> +				continue;
>> +			found = true;
>> +			/* Without this, layout can be freed as soon
>> +			 * as we release cl_lock.
>> +			 */
>> +			get_layout_hdr(lo);
>> +			break;
>> +		}
>> +		if (found)
>> +			break;
>> 	}
>> +	rcu_read_unlock();
>> 	spin_unlock(&clp->cl_lock);
>> +
>> 	if (!found)
>> 		return NFS4ERR_NOMATCHING_LAYOUT;
>> 
>> @@ -154,6 +162,7 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>> static u32 initiate_bulk_draining(struct nfs_client *clp,
>> 				  struct cb_layoutrecallargs *args)
>> {
>> +	struct nfs_server *server;
>> 	struct pnfs_layout_hdr *lo;
>> 	struct inode *ino;
>> 	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
>> @@ -167,18 +176,23 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
>> 	};
>> 
>> 	spin_lock(&clp->cl_lock);
>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>> -		if ((args->cbl_recall_type == RETURN_FSID) &&
>> -		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
>> -			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
>> -			continue;
>> -		if (!igrab(lo->plh_inode))
>> -			continue;
>> -		get_layout_hdr(lo);
>> -		BUG_ON(!list_empty(&lo->plh_bulk_recall));
>> -		list_add(&lo->plh_bulk_recall, &recall_list);
>> +	rcu_read_lock();
>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>> +			if ((args->cbl_recall_type == RETURN_FSID) &&
>> +			    memcmp(&server->fsid, &args->cbl_fsid,
>> +				   sizeof(struct nfs_fsid)))
>> +				continue;
> 
> This condition can be popped up to the outer loop now...
> (or break rather than continue)
> 
> Benny

Good point.  Fred wanted me to wait until this patch got in to optimize handling RETURN_FSID.  Comments?

-dros--
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Benny Halevy April 27, 2011, 8:31 p.m. UTC | #4
On 2011-04-27 21:56, Dros Adamson wrote:
> 
> On Apr 27, 2011, at 2:51 PM, Benny Halevy wrote:
> 
>> On 2011-04-27 19:44, Weston Andros Adamson wrote:
>>> Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
>>> instead of per struct nfs_client, which may have multiple FSIDs associated
>>> with it.
>>>
>>> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
>>> ---
>>> fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
>>> fs/nfs/client.c           |    6 ++--
>>> fs/nfs/pnfs.c             |   13 +++++++--
>>> include/linux/nfs_fs_sb.h |    2 +-
>>> 4 files changed, 51 insertions(+), 30 deletions(-)
>>>
>>> diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
>>> index 2f41dcce..3964467 100644
>>> --- a/fs/nfs/callback_proc.c
>>> +++ b/fs/nfs/callback_proc.c
>>> @@ -111,6 +111,7 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
>>> static u32 initiate_file_draining(struct nfs_client *clp,
>>> 				  struct cb_layoutrecallargs *args)
>>> {
>>> +	struct nfs_server *server;
>>> 	struct pnfs_layout_hdr *lo;
>>> 	struct inode *ino;
>>> 	bool found = false;
>>> @@ -118,21 +119,28 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>>> 	LIST_HEAD(free_me_list);
>>>
>>> 	spin_lock(&clp->cl_lock);
>>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>>> -		if (nfs_compare_fh(&args->cbl_fh,
>>> -				   &NFS_I(lo->plh_inode)->fh))
>>> -			continue;
>>> -		ino = igrab(lo->plh_inode);
>>> -		if (!ino)
>>> -			continue;
>>> -		found = true;
>>> -		/* Without this, layout can be freed as soon
>>> -		 * as we release cl_lock.
>>> -		 */
>>> -		get_layout_hdr(lo);
>>> -		break;
>>> +	rcu_read_lock();
>>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>>> +			if (nfs_compare_fh(&args->cbl_fh,
>>> +					   &NFS_I(lo->plh_inode)->fh))
>>> +				continue;
>>> +			ino = igrab(lo->plh_inode);
>>> +			if (!ino)
>>> +				continue;
>>> +			found = true;
>>> +			/* Without this, layout can be freed as soon
>>> +			 * as we release cl_lock.
>>> +			 */
>>> +			get_layout_hdr(lo);
>>> +			break;
>>> +		}
>>> +		if (found)
>>> +			break;
>>> 	}
>>> +	rcu_read_unlock();
>>> 	spin_unlock(&clp->cl_lock);
>>> +
>>> 	if (!found)
>>> 		return NFS4ERR_NOMATCHING_LAYOUT;
>>>
>>> @@ -154,6 +162,7 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>>> static u32 initiate_bulk_draining(struct nfs_client *clp,
>>> 				  struct cb_layoutrecallargs *args)
>>> {
>>> +	struct nfs_server *server;
>>> 	struct pnfs_layout_hdr *lo;
>>> 	struct inode *ino;
>>> 	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
>>> @@ -167,18 +176,23 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
>>> 	};
>>>
>>> 	spin_lock(&clp->cl_lock);
>>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>>> -		if ((args->cbl_recall_type == RETURN_FSID) &&
>>> -		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
>>> -			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
>>> -			continue;
>>> -		if (!igrab(lo->plh_inode))
>>> -			continue;
>>> -		get_layout_hdr(lo);
>>> -		BUG_ON(!list_empty(&lo->plh_bulk_recall));
>>> -		list_add(&lo->plh_bulk_recall, &recall_list);
>>> +	rcu_read_lock();
>>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>>> +			if ((args->cbl_recall_type == RETURN_FSID) &&
>>> +			    memcmp(&server->fsid, &args->cbl_fsid,
>>> +				   sizeof(struct nfs_fsid)))
>>> +				continue;
>>
>> This condition can be popped up to the outer loop now...
>> (or break rather than continue)
>>
>> Benny
> 
> Good point.  Fred wanted me to wait until this patch got in to optimize handling RETURN_FSID.  Comments?

In this case, I think it is overly careful since the mechanical
change of indenting the whole block in the inner loop doesn't
make sense here. The whole purpose of this patch, as mentioned
in the description is to track layouts per fsid, therefore
testing the fsid at the right level need not be separated
into a separate, optimizing patch, but rather it can be included
in this one as a self-sufficient version.

Benny

> 
> -dros--
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> the body of a message to majordomo@vger.kernel.org
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Weston Andros Adamson April 27, 2011, 10:38 p.m. UTC | #5
On Apr 27, 2011, at 4:31 PM, Benny Halevy wrote:

> On 2011-04-27 21:56, Dros Adamson wrote:
>> 
>> On Apr 27, 2011, at 2:51 PM, Benny Halevy wrote:
>> 
>>> On 2011-04-27 19:44, Weston Andros Adamson wrote:
>>>> Layouts should be tracked per FSID (aka superblock, aka struct nfs_server)
>>>> instead of per struct nfs_client, which may have multiple FSIDs associated
>>>> with it.
>>>> 
>>>> Signed-off-by: Weston Andros Adamson <dros@netapp.com>
>>>> ---
>>>> fs/nfs/callback_proc.c    |   60 +++++++++++++++++++++++++++-----------------
>>>> fs/nfs/client.c           |    6 ++--
>>>> fs/nfs/pnfs.c             |   13 +++++++--
>>>> include/linux/nfs_fs_sb.h |    2 +-
>>>> 4 files changed, 51 insertions(+), 30 deletions(-)
>>>> 
>>>> diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
>>>> index 2f41dcce..3964467 100644
>>>> --- a/fs/nfs/callback_proc.c
>>>> +++ b/fs/nfs/callback_proc.c
>>>> @@ -111,6 +111,7 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
>>>> static u32 initiate_file_draining(struct nfs_client *clp,
>>>> 				  struct cb_layoutrecallargs *args)
>>>> {
>>>> +	struct nfs_server *server;
>>>> 	struct pnfs_layout_hdr *lo;
>>>> 	struct inode *ino;
>>>> 	bool found = false;
>>>> @@ -118,21 +119,28 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>>>> 	LIST_HEAD(free_me_list);
>>>> 
>>>> 	spin_lock(&clp->cl_lock);
>>>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>>>> -		if (nfs_compare_fh(&args->cbl_fh,
>>>> -				   &NFS_I(lo->plh_inode)->fh))
>>>> -			continue;
>>>> -		ino = igrab(lo->plh_inode);
>>>> -		if (!ino)
>>>> -			continue;
>>>> -		found = true;
>>>> -		/* Without this, layout can be freed as soon
>>>> -		 * as we release cl_lock.
>>>> -		 */
>>>> -		get_layout_hdr(lo);
>>>> -		break;
>>>> +	rcu_read_lock();
>>>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>>>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>>>> +			if (nfs_compare_fh(&args->cbl_fh,
>>>> +					   &NFS_I(lo->plh_inode)->fh))
>>>> +				continue;
>>>> +			ino = igrab(lo->plh_inode);
>>>> +			if (!ino)
>>>> +				continue;
>>>> +			found = true;
>>>> +			/* Without this, layout can be freed as soon
>>>> +			 * as we release cl_lock.
>>>> +			 */
>>>> +			get_layout_hdr(lo);
>>>> +			break;
>>>> +		}
>>>> +		if (found)
>>>> +			break;
>>>> 	}
>>>> +	rcu_read_unlock();
>>>> 	spin_unlock(&clp->cl_lock);
>>>> +
>>>> 	if (!found)
>>>> 		return NFS4ERR_NOMATCHING_LAYOUT;
>>>> 
>>>> @@ -154,6 +162,7 @@ static u32 initiate_file_draining(struct nfs_client *clp,
>>>> static u32 initiate_bulk_draining(struct nfs_client *clp,
>>>> 				  struct cb_layoutrecallargs *args)
>>>> {
>>>> +	struct nfs_server *server;
>>>> 	struct pnfs_layout_hdr *lo;
>>>> 	struct inode *ino;
>>>> 	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
>>>> @@ -167,18 +176,23 @@ static u32 initiate_bulk_draining(struct nfs_client *clp,
>>>> 	};
>>>> 
>>>> 	spin_lock(&clp->cl_lock);
>>>> -	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
>>>> -		if ((args->cbl_recall_type == RETURN_FSID) &&
>>>> -		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
>>>> -			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
>>>> -			continue;
>>>> -		if (!igrab(lo->plh_inode))
>>>> -			continue;
>>>> -		get_layout_hdr(lo);
>>>> -		BUG_ON(!list_empty(&lo->plh_bulk_recall));
>>>> -		list_add(&lo->plh_bulk_recall, &recall_list);
>>>> +	rcu_read_lock();
>>>> +	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
>>>> +		list_for_each_entry(lo, &server->layouts, plh_layouts) {
>>>> +			if ((args->cbl_recall_type == RETURN_FSID) &&
>>>> +			    memcmp(&server->fsid, &args->cbl_fsid,
>>>> +				   sizeof(struct nfs_fsid)))
>>>> +				continue;
>>> 
>>> This condition can be popped up to the outer loop now...
>>> (or break rather than continue)
>>> 
>>> Benny
>> 
>> Good point.  Fred wanted me to wait until this patch got in to optimize handling RETURN_FSID.  Comments?
> 
> In this case, I think it is overly careful since the mechanical
> change of indenting the whole block in the inner loop doesn't
> make sense here. The whole purpose of this patch, as mentioned
> in the description is to track layouts per fsid, therefore
> testing the fsid at the right level need not be separated
> into a separate, optimizing patch, but rather it can be included
> in this one as a self-sufficient version.
> 
> Benny

OK, I buy it!  Patch on the way.

-dros


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Patch
diff mbox

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 2f41dcce..3964467 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -111,6 +111,7 @@  int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf
 static u32 initiate_file_draining(struct nfs_client *clp,
 				  struct cb_layoutrecallargs *args)
 {
+	struct nfs_server *server;
 	struct pnfs_layout_hdr *lo;
 	struct inode *ino;
 	bool found = false;
@@ -118,21 +119,28 @@  static u32 initiate_file_draining(struct nfs_client *clp,
 	LIST_HEAD(free_me_list);
 
 	spin_lock(&clp->cl_lock);
-	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
-		if (nfs_compare_fh(&args->cbl_fh,
-				   &NFS_I(lo->plh_inode)->fh))
-			continue;
-		ino = igrab(lo->plh_inode);
-		if (!ino)
-			continue;
-		found = true;
-		/* Without this, layout can be freed as soon
-		 * as we release cl_lock.
-		 */
-		get_layout_hdr(lo);
-		break;
+	rcu_read_lock();
+	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+		list_for_each_entry(lo, &server->layouts, plh_layouts) {
+			if (nfs_compare_fh(&args->cbl_fh,
+					   &NFS_I(lo->plh_inode)->fh))
+				continue;
+			ino = igrab(lo->plh_inode);
+			if (!ino)
+				continue;
+			found = true;
+			/* Without this, layout can be freed as soon
+			 * as we release cl_lock.
+			 */
+			get_layout_hdr(lo);
+			break;
+		}
+		if (found)
+			break;
 	}
+	rcu_read_unlock();
 	spin_unlock(&clp->cl_lock);
+
 	if (!found)
 		return NFS4ERR_NOMATCHING_LAYOUT;
 
@@ -154,6 +162,7 @@  static u32 initiate_file_draining(struct nfs_client *clp,
 static u32 initiate_bulk_draining(struct nfs_client *clp,
 				  struct cb_layoutrecallargs *args)
 {
+	struct nfs_server *server;
 	struct pnfs_layout_hdr *lo;
 	struct inode *ino;
 	u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
@@ -167,18 +176,23 @@  static u32 initiate_bulk_draining(struct nfs_client *clp,
 	};
 
 	spin_lock(&clp->cl_lock);
-	list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
-		if ((args->cbl_recall_type == RETURN_FSID) &&
-		    memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
-			   &args->cbl_fsid, sizeof(struct nfs_fsid)))
-			continue;
-		if (!igrab(lo->plh_inode))
-			continue;
-		get_layout_hdr(lo);
-		BUG_ON(!list_empty(&lo->plh_bulk_recall));
-		list_add(&lo->plh_bulk_recall, &recall_list);
+	rcu_read_lock();
+	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+		list_for_each_entry(lo, &server->layouts, plh_layouts) {
+			if ((args->cbl_recall_type == RETURN_FSID) &&
+			    memcmp(&server->fsid, &args->cbl_fsid,
+				   sizeof(struct nfs_fsid)))
+				continue;
+			if (!igrab(lo->plh_inode))
+				continue;
+			get_layout_hdr(lo);
+			BUG_ON(!list_empty(&lo->plh_bulk_recall));
+			list_add(&lo->plh_bulk_recall, &recall_list);
+		}
 	}
+	rcu_read_unlock();
 	spin_unlock(&clp->cl_lock);
+
 	list_for_each_entry_safe(lo, tmp,
 				 &recall_list, plh_bulk_recall) {
 		ino = lo->plh_inode;
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 139be96..f72fd39 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -188,9 +188,6 @@  static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
 	cred = rpc_lookup_machine_cred();
 	if (!IS_ERR(cred))
 		clp->cl_machine_cred = cred;
-#if defined(CONFIG_NFS_V4_1)
-	INIT_LIST_HEAD(&clp->cl_layouts);
-#endif
 	nfs_fscache_get_client_cookie(clp);
 
 	return clp;
@@ -1060,6 +1057,9 @@  static struct nfs_server *nfs_alloc_server(void)
 	INIT_LIST_HEAD(&server->client_link);
 	INIT_LIST_HEAD(&server->master_link);
 	INIT_LIST_HEAD(&server->delegations);
+#if defined(CONFIG_NFS_V4_1)
+	INIT_LIST_HEAD(&server->layouts);
+#endif
 
 	atomic_set(&server->active, 0);
 
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index ff681ab..6a5d0a4 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -371,11 +371,17 @@  pnfs_destroy_layout(struct nfs_inode *nfsi)
 void
 pnfs_destroy_all_layouts(struct nfs_client *clp)
 {
+	struct nfs_server *server;
 	struct pnfs_layout_hdr *lo;
 	LIST_HEAD(tmp_list);
 
 	spin_lock(&clp->cl_lock);
-	list_splice_init(&clp->cl_layouts, &tmp_list);
+	rcu_read_lock();
+	list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+		if (!list_empty(&server->layouts))
+			list_splice_init(&server->layouts, &tmp_list);
+	}
+	rcu_read_unlock();
 	spin_unlock(&clp->cl_lock);
 
 	while (!list_empty(&tmp_list)) {
@@ -759,7 +765,8 @@  pnfs_update_layout(struct inode *ino,
 		   enum pnfs_iomode iomode)
 {
 	struct nfs_inode *nfsi = NFS_I(ino);
-	struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
+	struct nfs_server *server = NFS_SERVER(ino);
+	struct nfs_client *clp = server->nfs_client;
 	struct pnfs_layout_hdr *lo;
 	struct pnfs_layout_segment *lseg = NULL;
 	bool first = false;
@@ -803,7 +810,7 @@  pnfs_update_layout(struct inode *ino,
 		 */
 		spin_lock(&clp->cl_lock);
 		BUG_ON(!list_empty(&lo->plh_layouts));
-		list_add_tail(&lo->plh_layouts, &clp->cl_layouts);
+		list_add_tail(&lo->plh_layouts, &server->layouts);
 		spin_unlock(&clp->cl_lock);
 	}
 
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 87694ca..f321015 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -77,7 +77,6 @@  struct nfs_client {
 	/* The flags used for obtaining the clientid during EXCHANGE_ID */
 	u32			cl_exchange_flags;
 	struct nfs4_session	*cl_session; 	/* sharred session */
-	struct list_head	cl_layouts;
 #endif /* CONFIG_NFS_V4 */
 
 #ifdef CONFIG_NFS_FSCACHE
@@ -148,6 +147,7 @@  struct nfs_server {
 	struct rb_root		state_owners;
 	struct rb_root		openowner_id;
 	struct rb_root		lockowner_id;
+	struct list_head	layouts;
 #endif
 	struct list_head	delegations;
 	void (*destroy)(struct nfs_server *);