[11/11] ocfs2: nowait aio support
diff mbox

Message ID 5a20852b.Suoho2jIQTKYp+nU%akpm@linux-foundation.org
State New
Headers show

Commit Message

Andrew Morton Nov. 30, 2017, 10:24 p.m. UTC
From: Gang He <ghe@suse.com>
Subject: ocfs2: nowait aio support

Return EAGAIN if any of the following checks fail for direct I/O:

- Cannot get the related locks immediately

- Blocks are not allocated at the write location, it will trigger
  block allocation and block IO operations.

[ghe@suse.com: v2]
  Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511944612-2D9629-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C4n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=bPQ5h9lbd8EtCwlBcfN_UJx6O1Fr6JiZUO7Ak2Igdds&e=
Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511775987-2D841-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C4n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=TX3FDWVXDkrHLxSD3HW3GW5igY6jogyX7Sf-OB5WrYk&e=
Signed-off-by: Gang He <ghe@suse.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/dir.c         |    2 
 fs/ocfs2/dlmglue.c     |   20 ++++++--
 fs/ocfs2/dlmglue.h     |    2 
 fs/ocfs2/file.c        |   95 ++++++++++++++++++++++++++++++---------
 fs/ocfs2/mmap.c        |    2 
 fs/ocfs2/ocfs2_trace.h |   10 ++--
 6 files changed, 99 insertions(+), 32 deletions(-)

Comments

zhendong chen Dec. 16, 2017, 8:37 a.m. UTC | #1
Hi Gang,

On 2017/12/1 6:24, akpm@linux-foundation.org wrote:
> From: Gang He <ghe@suse.com>
> Subject: ocfs2: nowait aio support
> 
> Return EAGAIN if any of the following checks fail for direct I/O:
> 
> - Cannot get the related locks immediately
> 
> - Blocks are not allocated at the write location, it will trigger
>   block allocation and block IO operations.
> 
> [ghe@suse.com: v2]
>   Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511944612-2D9629-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C4n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=bPQ5h9lbd8EtCwlBcfN_UJx6O1Fr6JiZUO7Ak2Igdds&e=
> Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511775987-2D841-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C4n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=TX3FDWVXDkrHLxSD3HW3GW5igY6jogyX7Sf-OB5WrYk&e=
> Signed-off-by: Gang He <ghe@suse.com>
> Cc: Mark Fasheh <mfasheh@versity.com>
> Cc: Joel Becker <jlbec@evilplan.org>
> Cc: Junxiao Bi <junxiao.bi@oracle.com>
> Cc: Joseph Qi <jiangqi903@gmail.com>
> Cc: Changwei Ge <ge.changwei@h3c.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  fs/ocfs2/dir.c         |    2 
>  fs/ocfs2/dlmglue.c     |   20 ++++++--
>  fs/ocfs2/dlmglue.h     |    2 
>  fs/ocfs2/file.c        |   95 ++++++++++++++++++++++++++++++---------
>  fs/ocfs2/mmap.c        |    2 
>  fs/ocfs2/ocfs2_trace.h |   10 ++--
>  6 files changed, 99 insertions(+), 32 deletions(-)
> 
> diff -puN fs/ocfs2/dir.c~ocfs2-nowait-aio-support fs/ocfs2/dir.c
> --- a/fs/ocfs2/dir.c~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/dir.c
> @@ -1957,7 +1957,7 @@ int ocfs2_readdir(struct file *file, str
>  
>  	trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno);
>  
> -	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level);
> +	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level, 1);
>  	if (lock_level && error >= 0) {
>  		/* We release EX lock which used to update atime
>  		 * and get PR lock again to reduce contention
> diff -puN fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.c
> --- a/fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/dlmglue.c
> @@ -2515,13 +2515,18 @@ int ocfs2_inode_lock_with_page(struct in
>  
>  int ocfs2_inode_lock_atime(struct inode *inode,
>  			  struct vfsmount *vfsmnt,
> -			  int *level)
> +			  int *level, int wait)
>  {
>  	int ret;
>  
> -	ret = ocfs2_inode_lock(inode, NULL, 0);
> +	if (wait)
> +		ret = ocfs2_inode_lock(inode, NULL, 0);
> +	else
> +		ret = ocfs2_try_inode_lock(inode, NULL, 0);
> +
>  	if (ret < 0) {
> -		mlog_errno(ret);
> +		if (ret != -EAGAIN)
> +			mlog_errno(ret);
>  		return ret;
>  	}
>  
> @@ -2533,9 +2538,14 @@ int ocfs2_inode_lock_atime(struct inode
>  		struct buffer_head *bh = NULL;
>  
>  		ocfs2_inode_unlock(inode, 0);
> -		ret = ocfs2_inode_lock(inode, &bh, 1);
> +		if (wait)
> +			ret = ocfs2_inode_lock(inode, &bh, 1);
> +		else
> +			ret = ocfs2_try_inode_lock(inode, &bh, 1);
> +
>  		if (ret < 0) {
> -			mlog_errno(ret);
> +			if (ret != -EAGAIN)
> +				mlog_errno(ret);
>  			return ret;
>  		}
>  		*level = 1;
> diff -puN fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.h
> --- a/fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/dlmglue.h
> @@ -123,7 +123,7 @@ int ocfs2_try_open_lock(struct inode *in
>  void ocfs2_open_unlock(struct inode *inode);
>  int ocfs2_inode_lock_atime(struct inode *inode,
>  			  struct vfsmount *vfsmnt,
> -			  int *level);
> +			  int *level, int wait);
>  int ocfs2_inode_lock_full_nested(struct inode *inode,
>  			 struct buffer_head **ret_bh,
>  			 int ex,
> diff -puN fs/ocfs2/file.c~ocfs2-nowait-aio-support fs/ocfs2/file.c
> --- a/fs/ocfs2/file.c~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/file.c
> @@ -140,6 +140,8 @@ static int ocfs2_file_open(struct inode
>  		spin_unlock(&oi->ip_lock);
>  	}
>  
> +	file->f_mode |= FMODE_NOWAIT;
> +
>  leave:
>  	return status;
>  }
> @@ -2132,12 +2134,12 @@ out:
>  }
>  
>  static int ocfs2_prepare_inode_for_write(struct file *file,
> -					 loff_t pos,
> -					 size_t count)
> +					 loff_t pos, size_t count, int wait)
>  {
> -	int ret = 0, meta_level = 0;
> +	int ret = 0, meta_level = 0, overwrite_io = 0;
>  	struct dentry *dentry = file->f_path.dentry;
>  	struct inode *inode = d_inode(dentry);
> +	struct buffer_head *di_bh = NULL;
>  	loff_t end;
>  
>  	/*
> @@ -2145,13 +2147,40 @@ static int ocfs2_prepare_inode_for_write
>  	 * if we need to make modifications here.
>  	 */
>  	for(;;) {
> -		ret = ocfs2_inode_lock(inode, NULL, meta_level);
> +		if (wait)
> +			ret = ocfs2_inode_lock(inode, NULL, meta_level);
> +		else
> +			ret = ocfs2_try_inode_lock(inode,
> +				overwrite_io ? NULL : &di_bh, meta_level);
>  		if (ret < 0) {
>  			meta_level = -1;
> -			mlog_errno(ret);
> +			if (ret != -EAGAIN)
> +				mlog_errno(ret);
>  			goto out;
>  		}
>  
> +		/*
> +		 * Check if IO will overwrite allocated blocks in case
> +		 * IOCB_NOWAIT flag is set.
> +		 */
> +		if (!wait && !overwrite_io) {
> +			overwrite_io = 1;
> +			if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
> +				ret = -EAGAIN;
> +				goto out_unlock;
> +			}
> +
Can we lock the 'ip_alloc_sem' in ocfs2_overwrite_io()?

BTW, should we consider the ocfs2_inode_lock() in ocfs2_prepare_inode_for_refcount()?
> +			ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
> +			brelse(di_bh);
> +			di_bh = NULL;
> +			up_read(&OCFS2_I(inode)->ip_alloc_sem);
> +			if (ret < 0) {
> +				if (ret != -EAGAIN)
> +					mlog_errno(ret);
> +				goto out_unlock;
> +			}
> +		}
> +
>  		/* Clear suid / sgid if necessary. We do this here
>  		 * instead of later in the write path because
>  		 * remove_suid() calls ->setattr without any hint that
> @@ -2199,7 +2228,9 @@ static int ocfs2_prepare_inode_for_write
>  
>  out_unlock:
>  	trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
> -					    pos, count);
> +					    pos, count, wait);
> +
> +	brelse(di_bh);
>  
>  	if (meta_level >= 0)
>  		ocfs2_inode_unlock(inode, meta_level);
> @@ -2211,7 +2242,7 @@ out:
>  static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
>  				    struct iov_iter *from)
>  {
> -	int direct_io, rw_level;
> +	int rw_level;
>  	ssize_t written = 0;
>  	ssize_t ret;
>  	size_t count = iov_iter_count(from);
> @@ -2223,6 +2254,8 @@ static ssize_t ocfs2_file_write_iter(str
>  	void *saved_ki_complete = NULL;
>  	int append_write = ((iocb->ki_pos + count) >=
>  			i_size_read(inode) ? 1 : 0);
> +	int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
> +	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
>  
>  	trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
>  		(unsigned long long)OCFS2_I(inode)->ip_blkno,
> @@ -2230,12 +2263,17 @@ static ssize_t ocfs2_file_write_iter(str
>  		file->f_path.dentry->d_name.name,
>  		(unsigned int)from->nr_segs);	/* GRRRRR */
>  
> +	if (!direct_io && nowait)
> +		return -EOPNOTSUPP;
> +
>  	if (count == 0)
>  		return 0;
>  
> -	direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
> -
> -	inode_lock(inode);
> +	if (direct_io && nowait) {
> +		if (!inode_trylock(inode))
> +			return -EAGAIN;
> +	} else
> +		inode_lock(inode);
>  
>  	/*
>  	 * Concurrent O_DIRECT writes are allowed with
> @@ -2244,9 +2282,13 @@ static ssize_t ocfs2_file_write_iter(str
>  	 */
>  	rw_level = (!direct_io || full_coherency || append_write);
>  
> -	ret = ocfs2_rw_lock(inode, rw_level);
> +	if (direct_io && nowait)
> +		ret = ocfs2_try_rw_lock(inode, rw_level);
> +	else
> +		ret = ocfs2_rw_lock(inode, rw_level);
>  	if (ret < 0) {
> -		mlog_errno(ret);
> +		if (ret != -EAGAIN)
> +			mlog_errno(ret);
>  		goto out_mutex;
>  	}
>  
> @@ -2260,9 +2302,13 @@ static ssize_t ocfs2_file_write_iter(str
>  		 * other nodes to drop their caches.  Buffered I/O
>  		 * already does this in write_begin().
>  		 */
> -		ret = ocfs2_inode_lock(inode, NULL, 1);
> +		if (nowait)
> +			ret = ocfs2_try_inode_lock(inode, NULL, 1);
> +		else
> +			ret = ocfs2_inode_lock(inode, NULL, 1);
>  		if (ret < 0) {
> -			mlog_errno(ret);
> +			if (ret != -EAGAIN)
> +				mlog_errno(ret);
>  			goto out;
>  		}
>  
> @@ -2277,9 +2323,10 @@ static ssize_t ocfs2_file_write_iter(str
>  	}
>  	count = ret;
>  
> -	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count);
> +	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
>  	if (ret < 0) {
> -		mlog_errno(ret);
> +		if (ret != -EAGAIN)
> +			mlog_errno(ret);
>  		goto out;
>  	}
>  
> @@ -2355,6 +2402,7 @@ static ssize_t ocfs2_file_read_iter(stru
>  	int ret = 0, rw_level = -1, lock_level = 0;
>  	struct file *filp = iocb->ki_filp;
>  	struct inode *inode = file_inode(filp);
> +	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
>  
>  	trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
>  			(unsigned long long)OCFS2_I(inode)->ip_blkno,
> @@ -2374,9 +2422,14 @@ static ssize_t ocfs2_file_read_iter(stru
>  	 * need locks to protect pending reads from racing with truncate.
>  	 */
>  	if (iocb->ki_flags & IOCB_DIRECT) {
> -		ret = ocfs2_rw_lock(inode, 0);
> +		if (nowait)
> +			ret = ocfs2_try_rw_lock(inode, 0);
> +		else
> +			ret = ocfs2_rw_lock(inode, 0);
> +
>  		if (ret < 0) {
> -			mlog_errno(ret);
> +			if (ret != -EAGAIN)
> +				mlog_errno(ret);
>  			goto bail;
>  		}
>  		rw_level = 0;
> @@ -2393,9 +2446,11 @@ static ssize_t ocfs2_file_read_iter(stru
>  	 * like i_size. This allows the checks down below
>  	 * generic_file_aio_read() a chance of actually working.
>  	 */
> -	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
> +	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
> +				     !nowait);
>  	if (ret < 0) {
> -		mlog_errno(ret);
> +		if (ret != -EAGAIN)
> +			mlog_errno(ret);
>  		goto bail;
>  	}
>  	ocfs2_inode_unlock(inode, lock_level);
> diff -puN fs/ocfs2/mmap.c~ocfs2-nowait-aio-support fs/ocfs2/mmap.c
> --- a/fs/ocfs2/mmap.c~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/mmap.c
> @@ -184,7 +184,7 @@ int ocfs2_mmap(struct file *file, struct
>  	int ret = 0, lock_level = 0;
>  
>  	ret = ocfs2_inode_lock_atime(file_inode(file),
> -				    file->f_path.mnt, &lock_level);
> +				    file->f_path.mnt, &lock_level, 1);
>  	if (ret < 0) {
>  		mlog_errno(ret);
>  		goto out;
> diff -puN fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support fs/ocfs2/ocfs2_trace.h
> --- a/fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support
> +++ a/fs/ocfs2/ocfs2_trace.h
> @@ -1449,20 +1449,22 @@ DEFINE_OCFS2_ULL_ULL_ULL_EVENT(ocfs2_rem
>  
>  TRACE_EVENT(ocfs2_prepare_inode_for_write,
>  	TP_PROTO(unsigned long long ino, unsigned long long saved_pos,
> -		 unsigned long count),
> -	TP_ARGS(ino, saved_pos, count),
> +		 unsigned long count, int wait),
> +	TP_ARGS(ino, saved_pos, count, wait),
>  	TP_STRUCT__entry(
>  		__field(unsigned long long, ino)
>  		__field(unsigned long long, saved_pos)
>  		__field(unsigned long, count)
> +		__field(int, wait)
>  	),
>  	TP_fast_assign(
>  		__entry->ino = ino;
>  		__entry->saved_pos = saved_pos;
>  		__entry->count = count;
> +		__entry->wait = wait;
>  	),
> -	TP_printk("%llu %llu %lu", __entry->ino,
> -		  __entry->saved_pos, __entry->count)
> +	TP_printk("%llu %llu %lu %d", __entry->ino,
> +		  __entry->saved_pos, __entry->count, __entry->wait)
>  );
>  
>  DEFINE_OCFS2_INT_EVENT(generic_file_aio_read_ret);
> _
> 
> _______________________________________________
> Ocfs2-devel mailing list
> Ocfs2-devel@oss.oracle.com
> https://oss.oracle.com/mailman/listinfo/ocfs2-devel
> 
> .
>
Gang He Dec. 18, 2017, 5:30 a.m. UTC | #2
>>> 
> Hi Gang,
> 
> On 2017/12/1 6:24, akpm@linux-foundation.org wrote:
>> From: Gang He <ghe@suse.com>
>> Subject: ocfs2: nowait aio support
>> 
>> Return EAGAIN if any of the following checks fail for direct I/O:
>> 
>> - Cannot get the related locks immediately
>> 
>> - Blocks are not allocated at the write location, it will trigger
>>   block allocation and block IO operations.
>> 
>> [ghe@suse.com: v2]
>>   Link: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_151194 
> 4612-2D9629-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8P
> Zh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C
> 4n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=bPQ5h9lbd8EtCwlBcfN_UJx6O1Fr6JiZUO7Ak2Igd
> ds&e=
>> Link: 
> https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_151177 
> 5987-2D841-2D4-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZ
> h8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=03axuTG8C4
> n44K1VY4yCWSg99FrknrLMs6_MlBfcfZU&s=TX3FDWVXDkrHLxSD3HW3GW5igY6jogyX7Sf-OB5WrYk&
> e=
>> Signed-off-by: Gang He <ghe@suse.com>
>> Cc: Mark Fasheh <mfasheh@versity.com>
>> Cc: Joel Becker <jlbec@evilplan.org>
>> Cc: Junxiao Bi <junxiao.bi@oracle.com>
>> Cc: Joseph Qi <jiangqi903@gmail.com>
>> Cc: Changwei Ge <ge.changwei@h3c.com>
>> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
>> ---
>> 
>>  fs/ocfs2/dir.c         |    2 
>>  fs/ocfs2/dlmglue.c     |   20 ++++++--
>>  fs/ocfs2/dlmglue.h     |    2 
>>  fs/ocfs2/file.c        |   95 ++++++++++++++++++++++++++++++---------
>>  fs/ocfs2/mmap.c        |    2 
>>  fs/ocfs2/ocfs2_trace.h |   10 ++--
>>  6 files changed, 99 insertions(+), 32 deletions(-)
>> 
>> diff -puN fs/ocfs2/dir.c~ocfs2-nowait-aio-support fs/ocfs2/dir.c
>> --- a/fs/ocfs2/dir.c~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/dir.c
>> @@ -1957,7 +1957,7 @@ int ocfs2_readdir(struct file *file, str
>>  
>>  	trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno);
>>  
>> -	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level);
>> +	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level, 1);
>>  	if (lock_level && error >= 0) {
>>  		/* We release EX lock which used to update atime
>>  		 * and get PR lock again to reduce contention
>> diff -puN fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.c
>> --- a/fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/dlmglue.c
>> @@ -2515,13 +2515,18 @@ int ocfs2_inode_lock_with_page(struct in
>>  
>>  int ocfs2_inode_lock_atime(struct inode *inode,
>>  			  struct vfsmount *vfsmnt,
>> -			  int *level)
>> +			  int *level, int wait)
>>  {
>>  	int ret;
>>  
>> -	ret = ocfs2_inode_lock(inode, NULL, 0);
>> +	if (wait)
>> +		ret = ocfs2_inode_lock(inode, NULL, 0);
>> +	else
>> +		ret = ocfs2_try_inode_lock(inode, NULL, 0);
>> +
>>  	if (ret < 0) {
>> -		mlog_errno(ret);
>> +		if (ret != -EAGAIN)
>> +			mlog_errno(ret);
>>  		return ret;
>>  	}
>>  
>> @@ -2533,9 +2538,14 @@ int ocfs2_inode_lock_atime(struct inode
>>  		struct buffer_head *bh = NULL;
>>  
>>  		ocfs2_inode_unlock(inode, 0);
>> -		ret = ocfs2_inode_lock(inode, &bh, 1);
>> +		if (wait)
>> +			ret = ocfs2_inode_lock(inode, &bh, 1);
>> +		else
>> +			ret = ocfs2_try_inode_lock(inode, &bh, 1);
>> +
>>  		if (ret < 0) {
>> -			mlog_errno(ret);
>> +			if (ret != -EAGAIN)
>> +				mlog_errno(ret);
>>  			return ret;
>>  		}
>>  		*level = 1;
>> diff -puN fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.h
>> --- a/fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/dlmglue.h
>> @@ -123,7 +123,7 @@ int ocfs2_try_open_lock(struct inode *in
>>  void ocfs2_open_unlock(struct inode *inode);
>>  int ocfs2_inode_lock_atime(struct inode *inode,
>>  			  struct vfsmount *vfsmnt,
>> -			  int *level);
>> +			  int *level, int wait);
>>  int ocfs2_inode_lock_full_nested(struct inode *inode,
>>  			 struct buffer_head **ret_bh,
>>  			 int ex,
>> diff -puN fs/ocfs2/file.c~ocfs2-nowait-aio-support fs/ocfs2/file.c
>> --- a/fs/ocfs2/file.c~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/file.c
>> @@ -140,6 +140,8 @@ static int ocfs2_file_open(struct inode
>>  		spin_unlock(&oi->ip_lock);
>>  	}
>>  
>> +	file->f_mode |= FMODE_NOWAIT;
>> +
>>  leave:
>>  	return status;
>>  }
>> @@ -2132,12 +2134,12 @@ out:
>>  }
>>  
>>  static int ocfs2_prepare_inode_for_write(struct file *file,
>> -					 loff_t pos,
>> -					 size_t count)
>> +					 loff_t pos, size_t count, int wait)
>>  {
>> -	int ret = 0, meta_level = 0;
>> +	int ret = 0, meta_level = 0, overwrite_io = 0;
>>  	struct dentry *dentry = file->f_path.dentry;
>>  	struct inode *inode = d_inode(dentry);
>> +	struct buffer_head *di_bh = NULL;
>>  	loff_t end;
>>  
>>  	/*
>> @@ -2145,13 +2147,40 @@ static int ocfs2_prepare_inode_for_write
>>  	 * if we need to make modifications here.
>>  	 */
>>  	for(;;) {
>> -		ret = ocfs2_inode_lock(inode, NULL, meta_level);
>> +		if (wait)
>> +			ret = ocfs2_inode_lock(inode, NULL, meta_level);
>> +		else
>> +			ret = ocfs2_try_inode_lock(inode,
>> +				overwrite_io ? NULL : &di_bh, meta_level);
>>  		if (ret < 0) {
>>  			meta_level = -1;
>> -			mlog_errno(ret);
>> +			if (ret != -EAGAIN)
>> +				mlog_errno(ret);
>>  			goto out;
>>  		}
>>  
>> +		/*
>> +		 * Check if IO will overwrite allocated blocks in case
>> +		 * IOCB_NOWAIT flag is set.
>> +		 */
>> +		if (!wait && !overwrite_io) {
>> +			overwrite_io = 1;
>> +			if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
>> +				ret = -EAGAIN;
>> +				goto out_unlock;
>> +			}
>> +
> Can we lock the 'ip_alloc_sem' in ocfs2_overwrite_io()?
Hi Alex, I feel it is better that there is not any lock within ocfs2_overwrite_io() function, since it can be re-used by other code in the future if possible.
Before use ocfs2_overwrite_io() function, we should get two kinds of lock, inode lock and ip_alloc_sem lock.
If we move one lock into the function, the user will become a little confused to get the correct locks, possibly will forget to get inode lock. 

> 
> BTW, should we consider the ocfs2_inode_lock() in 
> ocfs2_prepare_inode_for_refcount()?
In this case, if ocfs2_overwrite_IO() function is returned OK, we will not enter ocfs2_prepare_inode_for_refcount() path,
If enter that code path, that means to need allocate meta-block, for non-block IO mode, the code should has broken out to return error after ocfs2_overwrite_IO() function .  

Thanks
Gang


>> +			ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
>> +			brelse(di_bh);
>> +			di_bh = NULL;
>> +			up_read(&OCFS2_I(inode)->ip_alloc_sem);
>> +			if (ret < 0) {
>> +				if (ret != -EAGAIN)
>> +					mlog_errno(ret);
>> +				goto out_unlock;
>> +			}
>> +		}
>> +
>>  		/* Clear suid / sgid if necessary. We do this here
>>  		 * instead of later in the write path because
>>  		 * remove_suid() calls ->setattr without any hint that
>> @@ -2199,7 +2228,9 @@ static int ocfs2_prepare_inode_for_write
>>  
>>  out_unlock:
>>  	trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
>> -					    pos, count);
>> +					    pos, count, wait);
>> +
>> +	brelse(di_bh);
>>  
>>  	if (meta_level >= 0)
>>  		ocfs2_inode_unlock(inode, meta_level);
>> @@ -2211,7 +2242,7 @@ out:
>>  static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
>>  				    struct iov_iter *from)
>>  {
>> -	int direct_io, rw_level;
>> +	int rw_level;
>>  	ssize_t written = 0;
>>  	ssize_t ret;
>>  	size_t count = iov_iter_count(from);
>> @@ -2223,6 +2254,8 @@ static ssize_t ocfs2_file_write_iter(str
>>  	void *saved_ki_complete = NULL;
>>  	int append_write = ((iocb->ki_pos + count) >=
>>  			i_size_read(inode) ? 1 : 0);
>> +	int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
>> +	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
>>  
>>  	trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
>>  		(unsigned long long)OCFS2_I(inode)->ip_blkno,
>> @@ -2230,12 +2263,17 @@ static ssize_t ocfs2_file_write_iter(str
>>  		file->f_path.dentry->d_name.name,
>>  		(unsigned int)from->nr_segs);	/* GRRRRR */
>>  
>> +	if (!direct_io && nowait)
>> +		return -EOPNOTSUPP;
>> +
>>  	if (count == 0)
>>  		return 0;
>>  
>> -	direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
>> -
>> -	inode_lock(inode);
>> +	if (direct_io && nowait) {
>> +		if (!inode_trylock(inode))
>> +			return -EAGAIN;
>> +	} else
>> +		inode_lock(inode);
>>  
>>  	/*
>>  	 * Concurrent O_DIRECT writes are allowed with
>> @@ -2244,9 +2282,13 @@ static ssize_t ocfs2_file_write_iter(str
>>  	 */
>>  	rw_level = (!direct_io || full_coherency || append_write);
>>  
>> -	ret = ocfs2_rw_lock(inode, rw_level);
>> +	if (direct_io && nowait)
>> +		ret = ocfs2_try_rw_lock(inode, rw_level);
>> +	else
>> +		ret = ocfs2_rw_lock(inode, rw_level);
>>  	if (ret < 0) {
>> -		mlog_errno(ret);
>> +		if (ret != -EAGAIN)
>> +			mlog_errno(ret);
>>  		goto out_mutex;
>>  	}
>>  
>> @@ -2260,9 +2302,13 @@ static ssize_t ocfs2_file_write_iter(str
>>  		 * other nodes to drop their caches.  Buffered I/O
>>  		 * already does this in write_begin().
>>  		 */
>> -		ret = ocfs2_inode_lock(inode, NULL, 1);
>> +		if (nowait)
>> +			ret = ocfs2_try_inode_lock(inode, NULL, 1);
>> +		else
>> +			ret = ocfs2_inode_lock(inode, NULL, 1);
>>  		if (ret < 0) {
>> -			mlog_errno(ret);
>> +			if (ret != -EAGAIN)
>> +				mlog_errno(ret);
>>  			goto out;
>>  		}
>>  
>> @@ -2277,9 +2323,10 @@ static ssize_t ocfs2_file_write_iter(str
>>  	}
>>  	count = ret;
>>  
>> -	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count);
>> +	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
>>  	if (ret < 0) {
>> -		mlog_errno(ret);
>> +		if (ret != -EAGAIN)
>> +			mlog_errno(ret);
>>  		goto out;
>>  	}
>>  
>> @@ -2355,6 +2402,7 @@ static ssize_t ocfs2_file_read_iter(stru
>>  	int ret = 0, rw_level = -1, lock_level = 0;
>>  	struct file *filp = iocb->ki_filp;
>>  	struct inode *inode = file_inode(filp);
>> +	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
>>  
>>  	trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
>>  			(unsigned long long)OCFS2_I(inode)->ip_blkno,
>> @@ -2374,9 +2422,14 @@ static ssize_t ocfs2_file_read_iter(stru
>>  	 * need locks to protect pending reads from racing with truncate.
>>  	 */
>>  	if (iocb->ki_flags & IOCB_DIRECT) {
>> -		ret = ocfs2_rw_lock(inode, 0);
>> +		if (nowait)
>> +			ret = ocfs2_try_rw_lock(inode, 0);
>> +		else
>> +			ret = ocfs2_rw_lock(inode, 0);
>> +
>>  		if (ret < 0) {
>> -			mlog_errno(ret);
>> +			if (ret != -EAGAIN)
>> +				mlog_errno(ret);
>>  			goto bail;
>>  		}
>>  		rw_level = 0;
>> @@ -2393,9 +2446,11 @@ static ssize_t ocfs2_file_read_iter(stru
>>  	 * like i_size. This allows the checks down below
>>  	 * generic_file_aio_read() a chance of actually working.
>>  	 */
>> -	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
>> +	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
>> +				     !nowait);
>>  	if (ret < 0) {
>> -		mlog_errno(ret);
>> +		if (ret != -EAGAIN)
>> +			mlog_errno(ret);
>>  		goto bail;
>>  	}
>>  	ocfs2_inode_unlock(inode, lock_level);
>> diff -puN fs/ocfs2/mmap.c~ocfs2-nowait-aio-support fs/ocfs2/mmap.c
>> --- a/fs/ocfs2/mmap.c~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/mmap.c
>> @@ -184,7 +184,7 @@ int ocfs2_mmap(struct file *file, struct
>>  	int ret = 0, lock_level = 0;
>>  
>>  	ret = ocfs2_inode_lock_atime(file_inode(file),
>> -				    file->f_path.mnt, &lock_level);
>> +				    file->f_path.mnt, &lock_level, 1);
>>  	if (ret < 0) {
>>  		mlog_errno(ret);
>>  		goto out;
>> diff -puN fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support fs/ocfs2/ocfs2_trace.h
>> --- a/fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support
>> +++ a/fs/ocfs2/ocfs2_trace.h
>> @@ -1449,20 +1449,22 @@ DEFINE_OCFS2_ULL_ULL_ULL_EVENT(ocfs2_rem
>>  
>>  TRACE_EVENT(ocfs2_prepare_inode_for_write,
>>  	TP_PROTO(unsigned long long ino, unsigned long long saved_pos,
>> -		 unsigned long count),
>> -	TP_ARGS(ino, saved_pos, count),
>> +		 unsigned long count, int wait),
>> +	TP_ARGS(ino, saved_pos, count, wait),
>>  	TP_STRUCT__entry(
>>  		__field(unsigned long long, ino)
>>  		__field(unsigned long long, saved_pos)
>>  		__field(unsigned long, count)
>> +		__field(int, wait)
>>  	),
>>  	TP_fast_assign(
>>  		__entry->ino = ino;
>>  		__entry->saved_pos = saved_pos;
>>  		__entry->count = count;
>> +		__entry->wait = wait;
>>  	),
>> -	TP_printk("%llu %llu %lu", __entry->ino,
>> -		  __entry->saved_pos, __entry->count)
>> +	TP_printk("%llu %llu %lu %d", __entry->ino,
>> +		  __entry->saved_pos, __entry->count, __entry->wait)
>>  );
>>  
>>  DEFINE_OCFS2_INT_EVENT(generic_file_aio_read_ret);
>> _
>> 
>> _______________________________________________
>> Ocfs2-devel mailing list
>> Ocfs2-devel@oss.oracle.com 
>> https://oss.oracle.com/mailman/listinfo/ocfs2-devel 
>> 
>> .
>>

Patch
diff mbox

diff -puN fs/ocfs2/dir.c~ocfs2-nowait-aio-support fs/ocfs2/dir.c
--- a/fs/ocfs2/dir.c~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/dir.c
@@ -1957,7 +1957,7 @@  int ocfs2_readdir(struct file *file, str
 
 	trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno);
 
-	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level);
+	error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level, 1);
 	if (lock_level && error >= 0) {
 		/* We release EX lock which used to update atime
 		 * and get PR lock again to reduce contention
diff -puN fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.c
--- a/fs/ocfs2/dlmglue.c~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/dlmglue.c
@@ -2515,13 +2515,18 @@  int ocfs2_inode_lock_with_page(struct in
 
 int ocfs2_inode_lock_atime(struct inode *inode,
 			  struct vfsmount *vfsmnt,
-			  int *level)
+			  int *level, int wait)
 {
 	int ret;
 
-	ret = ocfs2_inode_lock(inode, NULL, 0);
+	if (wait)
+		ret = ocfs2_inode_lock(inode, NULL, 0);
+	else
+		ret = ocfs2_try_inode_lock(inode, NULL, 0);
+
 	if (ret < 0) {
-		mlog_errno(ret);
+		if (ret != -EAGAIN)
+			mlog_errno(ret);
 		return ret;
 	}
 
@@ -2533,9 +2538,14 @@  int ocfs2_inode_lock_atime(struct inode
 		struct buffer_head *bh = NULL;
 
 		ocfs2_inode_unlock(inode, 0);
-		ret = ocfs2_inode_lock(inode, &bh, 1);
+		if (wait)
+			ret = ocfs2_inode_lock(inode, &bh, 1);
+		else
+			ret = ocfs2_try_inode_lock(inode, &bh, 1);
+
 		if (ret < 0) {
-			mlog_errno(ret);
+			if (ret != -EAGAIN)
+				mlog_errno(ret);
 			return ret;
 		}
 		*level = 1;
diff -puN fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support fs/ocfs2/dlmglue.h
--- a/fs/ocfs2/dlmglue.h~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/dlmglue.h
@@ -123,7 +123,7 @@  int ocfs2_try_open_lock(struct inode *in
 void ocfs2_open_unlock(struct inode *inode);
 int ocfs2_inode_lock_atime(struct inode *inode,
 			  struct vfsmount *vfsmnt,
-			  int *level);
+			  int *level, int wait);
 int ocfs2_inode_lock_full_nested(struct inode *inode,
 			 struct buffer_head **ret_bh,
 			 int ex,
diff -puN fs/ocfs2/file.c~ocfs2-nowait-aio-support fs/ocfs2/file.c
--- a/fs/ocfs2/file.c~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/file.c
@@ -140,6 +140,8 @@  static int ocfs2_file_open(struct inode
 		spin_unlock(&oi->ip_lock);
 	}
 
+	file->f_mode |= FMODE_NOWAIT;
+
 leave:
 	return status;
 }
@@ -2132,12 +2134,12 @@  out:
 }
 
 static int ocfs2_prepare_inode_for_write(struct file *file,
-					 loff_t pos,
-					 size_t count)
+					 loff_t pos, size_t count, int wait)
 {
-	int ret = 0, meta_level = 0;
+	int ret = 0, meta_level = 0, overwrite_io = 0;
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode *inode = d_inode(dentry);
+	struct buffer_head *di_bh = NULL;
 	loff_t end;
 
 	/*
@@ -2145,13 +2147,40 @@  static int ocfs2_prepare_inode_for_write
 	 * if we need to make modifications here.
 	 */
 	for(;;) {
-		ret = ocfs2_inode_lock(inode, NULL, meta_level);
+		if (wait)
+			ret = ocfs2_inode_lock(inode, NULL, meta_level);
+		else
+			ret = ocfs2_try_inode_lock(inode,
+				overwrite_io ? NULL : &di_bh, meta_level);
 		if (ret < 0) {
 			meta_level = -1;
-			mlog_errno(ret);
+			if (ret != -EAGAIN)
+				mlog_errno(ret);
 			goto out;
 		}
 
+		/*
+		 * Check if IO will overwrite allocated blocks in case
+		 * IOCB_NOWAIT flag is set.
+		 */
+		if (!wait && !overwrite_io) {
+			overwrite_io = 1;
+			if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
+				ret = -EAGAIN;
+				goto out_unlock;
+			}
+
+			ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
+			brelse(di_bh);
+			di_bh = NULL;
+			up_read(&OCFS2_I(inode)->ip_alloc_sem);
+			if (ret < 0) {
+				if (ret != -EAGAIN)
+					mlog_errno(ret);
+				goto out_unlock;
+			}
+		}
+
 		/* Clear suid / sgid if necessary. We do this here
 		 * instead of later in the write path because
 		 * remove_suid() calls ->setattr without any hint that
@@ -2199,7 +2228,9 @@  static int ocfs2_prepare_inode_for_write
 
 out_unlock:
 	trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
-					    pos, count);
+					    pos, count, wait);
+
+	brelse(di_bh);
 
 	if (meta_level >= 0)
 		ocfs2_inode_unlock(inode, meta_level);
@@ -2211,7 +2242,7 @@  out:
 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
 				    struct iov_iter *from)
 {
-	int direct_io, rw_level;
+	int rw_level;
 	ssize_t written = 0;
 	ssize_t ret;
 	size_t count = iov_iter_count(from);
@@ -2223,6 +2254,8 @@  static ssize_t ocfs2_file_write_iter(str
 	void *saved_ki_complete = NULL;
 	int append_write = ((iocb->ki_pos + count) >=
 			i_size_read(inode) ? 1 : 0);
+	int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
+	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
 
 	trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
 		(unsigned long long)OCFS2_I(inode)->ip_blkno,
@@ -2230,12 +2263,17 @@  static ssize_t ocfs2_file_write_iter(str
 		file->f_path.dentry->d_name.name,
 		(unsigned int)from->nr_segs);	/* GRRRRR */
 
+	if (!direct_io && nowait)
+		return -EOPNOTSUPP;
+
 	if (count == 0)
 		return 0;
 
-	direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
-
-	inode_lock(inode);
+	if (direct_io && nowait) {
+		if (!inode_trylock(inode))
+			return -EAGAIN;
+	} else
+		inode_lock(inode);
 
 	/*
 	 * Concurrent O_DIRECT writes are allowed with
@@ -2244,9 +2282,13 @@  static ssize_t ocfs2_file_write_iter(str
 	 */
 	rw_level = (!direct_io || full_coherency || append_write);
 
-	ret = ocfs2_rw_lock(inode, rw_level);
+	if (direct_io && nowait)
+		ret = ocfs2_try_rw_lock(inode, rw_level);
+	else
+		ret = ocfs2_rw_lock(inode, rw_level);
 	if (ret < 0) {
-		mlog_errno(ret);
+		if (ret != -EAGAIN)
+			mlog_errno(ret);
 		goto out_mutex;
 	}
 
@@ -2260,9 +2302,13 @@  static ssize_t ocfs2_file_write_iter(str
 		 * other nodes to drop their caches.  Buffered I/O
 		 * already does this in write_begin().
 		 */
-		ret = ocfs2_inode_lock(inode, NULL, 1);
+		if (nowait)
+			ret = ocfs2_try_inode_lock(inode, NULL, 1);
+		else
+			ret = ocfs2_inode_lock(inode, NULL, 1);
 		if (ret < 0) {
-			mlog_errno(ret);
+			if (ret != -EAGAIN)
+				mlog_errno(ret);
 			goto out;
 		}
 
@@ -2277,9 +2323,10 @@  static ssize_t ocfs2_file_write_iter(str
 	}
 	count = ret;
 
-	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count);
+	ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
 	if (ret < 0) {
-		mlog_errno(ret);
+		if (ret != -EAGAIN)
+			mlog_errno(ret);
 		goto out;
 	}
 
@@ -2355,6 +2402,7 @@  static ssize_t ocfs2_file_read_iter(stru
 	int ret = 0, rw_level = -1, lock_level = 0;
 	struct file *filp = iocb->ki_filp;
 	struct inode *inode = file_inode(filp);
+	int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
 
 	trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
 			(unsigned long long)OCFS2_I(inode)->ip_blkno,
@@ -2374,9 +2422,14 @@  static ssize_t ocfs2_file_read_iter(stru
 	 * need locks to protect pending reads from racing with truncate.
 	 */
 	if (iocb->ki_flags & IOCB_DIRECT) {
-		ret = ocfs2_rw_lock(inode, 0);
+		if (nowait)
+			ret = ocfs2_try_rw_lock(inode, 0);
+		else
+			ret = ocfs2_rw_lock(inode, 0);
+
 		if (ret < 0) {
-			mlog_errno(ret);
+			if (ret != -EAGAIN)
+				mlog_errno(ret);
 			goto bail;
 		}
 		rw_level = 0;
@@ -2393,9 +2446,11 @@  static ssize_t ocfs2_file_read_iter(stru
 	 * like i_size. This allows the checks down below
 	 * generic_file_aio_read() a chance of actually working.
 	 */
-	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
+	ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
+				     !nowait);
 	if (ret < 0) {
-		mlog_errno(ret);
+		if (ret != -EAGAIN)
+			mlog_errno(ret);
 		goto bail;
 	}
 	ocfs2_inode_unlock(inode, lock_level);
diff -puN fs/ocfs2/mmap.c~ocfs2-nowait-aio-support fs/ocfs2/mmap.c
--- a/fs/ocfs2/mmap.c~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/mmap.c
@@ -184,7 +184,7 @@  int ocfs2_mmap(struct file *file, struct
 	int ret = 0, lock_level = 0;
 
 	ret = ocfs2_inode_lock_atime(file_inode(file),
-				    file->f_path.mnt, &lock_level);
+				    file->f_path.mnt, &lock_level, 1);
 	if (ret < 0) {
 		mlog_errno(ret);
 		goto out;
diff -puN fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support fs/ocfs2/ocfs2_trace.h
--- a/fs/ocfs2/ocfs2_trace.h~ocfs2-nowait-aio-support
+++ a/fs/ocfs2/ocfs2_trace.h
@@ -1449,20 +1449,22 @@  DEFINE_OCFS2_ULL_ULL_ULL_EVENT(ocfs2_rem
 
 TRACE_EVENT(ocfs2_prepare_inode_for_write,
 	TP_PROTO(unsigned long long ino, unsigned long long saved_pos,
-		 unsigned long count),
-	TP_ARGS(ino, saved_pos, count),
+		 unsigned long count, int wait),
+	TP_ARGS(ino, saved_pos, count, wait),
 	TP_STRUCT__entry(
 		__field(unsigned long long, ino)
 		__field(unsigned long long, saved_pos)
 		__field(unsigned long, count)
+		__field(int, wait)
 	),
 	TP_fast_assign(
 		__entry->ino = ino;
 		__entry->saved_pos = saved_pos;
 		__entry->count = count;
+		__entry->wait = wait;
 	),
-	TP_printk("%llu %llu %lu", __entry->ino,
-		  __entry->saved_pos, __entry->count)
+	TP_printk("%llu %llu %lu %d", __entry->ino,
+		  __entry->saved_pos, __entry->count, __entry->wait)
 );
 
 DEFINE_OCFS2_INT_EVENT(generic_file_aio_read_ret);