| Message ID | 1511944612-9629-2-git-send-email-ghe@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2017/11/29 16:36, Gang He wrote: > Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which > will be used in non-block IO scenarios. > > Signed-off-by: Gang He <ghe@suse.com> Reviewed-by: Jun Piao <piaojun@huawei.com> > --- > fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ > fs/ocfs2/dlmglue.h | 4 ++++ > 2 files changed, 25 insertions(+) > > diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c > index 4689940..a68efa3 100644 > --- a/fs/ocfs2/dlmglue.c > +++ b/fs/ocfs2/dlmglue.c > @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) > return status; > } > > +int ocfs2_try_rw_lock(struct inode *inode, int write) > +{ > + int status, level; > + struct ocfs2_lock_res *lockres; > + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); > + > + mlog(0, "inode %llu try to take %s RW lock\n", > + (unsigned long long)OCFS2_I(inode)->ip_blkno, > + write ? "EXMODE" : "PRMODE"); > + > + if (ocfs2_mount_local(osb)) > + return 0; > + > + lockres = &OCFS2_I(inode)->ip_rw_lockres; > + > + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; > + > + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); > + return status; > +} > + > void ocfs2_rw_unlock(struct inode *inode, int write) > { > int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; > diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h > index a7fc18b..05910fc 100644 > --- a/fs/ocfs2/dlmglue.h > +++ b/fs/ocfs2/dlmglue.h > @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, > int ocfs2_create_new_inode_locks(struct inode *inode); > int ocfs2_drop_inode_locks(struct inode *inode); > int ocfs2_rw_lock(struct inode *inode, int write); > +int ocfs2_try_rw_lock(struct inode *inode, int write); > void ocfs2_rw_unlock(struct inode *inode, int write); > int ocfs2_open_lock(struct inode *inode); > int ocfs2_try_open_lock(struct inode *inode, int write); > @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, > /* 99% of the time we don't want to supply any additional flags -- > * those are for very specific cases only. */ > #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL) > +#define ocfs2_try_inode_lock(i, b, e)\ > + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ > + OI_LS_NORMAL) > void ocfs2_inode_unlock(struct inode *inode, > int ex); > int ocfs2_super_lock(struct ocfs2_super *osb, >
On 2017/11/29 16:38, Gang He wrote: > Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which > will be used in non-block IO scenarios. > > Signed-off-by: Gang He <ghe@suse.com> > --- > fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ > fs/ocfs2/dlmglue.h | 4 ++++ > 2 files changed, 25 insertions(+) > > diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c > index 4689940..a68efa3 100644 > --- a/fs/ocfs2/dlmglue.c > +++ b/fs/ocfs2/dlmglue.c > @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) > return status; > } > > +int ocfs2_try_rw_lock(struct inode *inode, int write) > +{ > + int status, level; > + struct ocfs2_lock_res *lockres; > + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); > + > + mlog(0, "inode %llu try to take %s RW lock\n", > + (unsigned long long)OCFS2_I(inode)->ip_blkno, > + write ? "EXMODE" : "PRMODE"); > + > + if (ocfs2_mount_local(osb)) > + return 0; > + > + lockres = &OCFS2_I(inode)->ip_rw_lockres; > + > + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; > + > + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); Hi Gang, Should we consider about passing a flag - OCFS2_LOCK_NONBLOCK to ocfs2_cluster_lock. Otherwise a cluster locking progress may be waiting for accomplishment of DC, which I think violates _NO_WAIT_ semantics. Thanks, Changwei. > + return status; > +} > + > void ocfs2_rw_unlock(struct inode *inode, int write) > { > int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; > diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h > index a7fc18b..05910fc 100644 > --- a/fs/ocfs2/dlmglue.h > +++ b/fs/ocfs2/dlmglue.h > @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, > int ocfs2_create_new_inode_locks(struct inode *inode); > int ocfs2_drop_inode_locks(struct inode *inode); > int ocfs2_rw_lock(struct inode *inode, int write); > +int ocfs2_try_rw_lock(struct inode *inode, int write); > void ocfs2_rw_unlock(struct inode *inode, int write); > int ocfs2_open_lock(struct inode *inode); > int ocfs2_try_open_lock(struct inode *inode, int write); > @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, > /* 99% of the time we don't want to supply any additional flags -- > * those are for very specific cases only. */ > #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL) > +#define ocfs2_try_inode_lock(i, b, e)\ > + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ > + OI_LS_NORMAL) > void ocfs2_inode_unlock(struct inode *inode, > int ex); > int ocfs2_super_lock(struct ocfs2_super *osb, >
Hello Changwei, >>> > On 2017/11/29 16:38, Gang He wrote: >> Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which >> will be used in non-block IO scenarios. >> >> Signed-off-by: Gang He <ghe@suse.com> >> --- >> fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ >> fs/ocfs2/dlmglue.h | 4 ++++ >> 2 files changed, 25 insertions(+) >> >> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c >> index 4689940..a68efa3 100644 >> --- a/fs/ocfs2/dlmglue.c >> +++ b/fs/ocfs2/dlmglue.c >> @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) >> return status; >> } >> >> +int ocfs2_try_rw_lock(struct inode *inode, int write) >> +{ >> + int status, level; >> + struct ocfs2_lock_res *lockres; >> + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); >> + >> + mlog(0, "inode %llu try to take %s RW lock\n", >> + (unsigned long long)OCFS2_I(inode)->ip_blkno, >> + write ? "EXMODE" : "PRMODE"); >> + >> + if (ocfs2_mount_local(osb)) >> + return 0; >> + >> + lockres = &OCFS2_I(inode)->ip_rw_lockres; >> + >> + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >> + >> + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); > > Hi Gang, > Should we consider about passing a flag - OCFS2_LOCK_NONBLOCK to > ocfs2_cluster_lock. Otherwise a cluster locking progress may be waiting > for accomplishment of DC, which I think violates _NO_WAIT_ semantics. If ocfs2 is a local file system, we should not wait for any condition, but for a cluster file system, we cannot avoid this totally according to the current DLM lock design, we need to wait for a little to get lock for the first time. Why do we not use OCFS2_LOCK_NONBLOCK flag to get a lock? since this flag is not stable to get a lock no matter this lock is occupied by other nodes, or not. If you use OCFS2_LOCK_NONBLOCK flag to get a fresh lock, you possibly fail or success, depends on when the lock acquisition callback happens. So, I think DLM_LKF_NOQUEUE flag should be more matched to _NO_WAIT_ semantics. we always get a fresh lock successfully, always failed if the lock is/was occupied by other nodes. This flag can give us a consistent locking behavior. Thanks Gang > > Thanks, > Changwei. > >> + return status; >> +} >> + >> void ocfs2_rw_unlock(struct inode *inode, int write) >> { >> int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >> diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h >> index a7fc18b..05910fc 100644 >> --- a/fs/ocfs2/dlmglue.h >> +++ b/fs/ocfs2/dlmglue.h >> @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res > *lockres, >> int ocfs2_create_new_inode_locks(struct inode *inode); >> int ocfs2_drop_inode_locks(struct inode *inode); >> int ocfs2_rw_lock(struct inode *inode, int write); >> +int ocfs2_try_rw_lock(struct inode *inode, int write); >> void ocfs2_rw_unlock(struct inode *inode, int write); >> int ocfs2_open_lock(struct inode *inode); >> int ocfs2_try_open_lock(struct inode *inode, int write); >> @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, >> /* 99% of the time we don't want to supply any additional flags -- >> * those are for very specific cases only. */ >> #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, > OI_LS_NORMAL) >> +#define ocfs2_try_inode_lock(i, b, e)\ >> + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ >> + OI_LS_NORMAL) >> void ocfs2_inode_unlock(struct inode *inode, >> int ex); >> int ocfs2_super_lock(struct ocfs2_super *osb, >>
Hi Gang, On 2017/11/30 10:45, Gang He wrote: > Hello Changwei, > > >>>> >> On 2017/11/29 16:38, Gang He wrote: >>> Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which >>> will be used in non-block IO scenarios. >>> >>> Signed-off-by: Gang He <ghe@suse.com> >>> --- >>> fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ >>> fs/ocfs2/dlmglue.h | 4 ++++ >>> 2 files changed, 25 insertions(+) >>> >>> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c >>> index 4689940..a68efa3 100644 >>> --- a/fs/ocfs2/dlmglue.c >>> +++ b/fs/ocfs2/dlmglue.c >>> @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) >>> return status; >>> } >>> >>> +int ocfs2_try_rw_lock(struct inode *inode, int write) >>> +{ >>> + int status, level; >>> + struct ocfs2_lock_res *lockres; >>> + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); >>> + >>> + mlog(0, "inode %llu try to take %s RW lock\n", >>> + (unsigned long long)OCFS2_I(inode)->ip_blkno, >>> + write ? "EXMODE" : "PRMODE"); >>> + >>> + if (ocfs2_mount_local(osb)) >>> + return 0; >>> + >>> + lockres = &OCFS2_I(inode)->ip_rw_lockres; >>> + >>> + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >>> + >>> + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); >> >> Hi Gang, >> Should we consider about passing a flag - OCFS2_LOCK_NONBLOCK to >> ocfs2_cluster_lock. Otherwise a cluster locking progress may be waiting >> for accomplishment of DC, which I think violates _NO_WAIT_ semantics. > > If ocfs2 is a local file system, we should not wait for any condition, but for a cluster file system, > we cannot avoid this totally according to the current DLM lock design, we need to wait for a little to get lock for the first time. > Why do we not use OCFS2_LOCK_NONBLOCK flag to get a lock? > since this flag is not stable to get a lock no matter this lock is occupied by other nodes, or not. I suppose local node must be granted under the condition that it is marked with *OCFS2_LOCK_BLOCKED*. And the control flag _OCFS2_LOCK_NONBLOCK_ will make lock progress directly return -EAGAIN without any waiting. > If you use OCFS2_LOCK_NONBLOCK flag to get a fresh lock, you possibly fail or success, depends on when the lock acquisition callback happens. > So, I think DLM_LKF_NOQUEUE flag should be more matched to _NO_WAIT_ semantics. I thinks OCFS2_LOCK_NONBLOCK doesn't conflict DLM_LKF_NOQUEUE, they are the forth and fifth argument respectively. > we always get a fresh lock successfully, always failed if the lock is/was occupied by other nodes. What do you mean by a fresh lock? A lock that is never granted or acquired? If a lock is marked with OCFS2_LOCK_BLOCKED, local node must has acquired it. Thanks, Changwei > This flag can give us a consistent locking behavior. > > Thanks > Gang > > > >> >> Thanks, >> Changwei. >> >>> + return status; >>> +} >>> + >>> void ocfs2_rw_unlock(struct inode *inode, int write) >>> { >>> int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >>> diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h >>> index a7fc18b..05910fc 100644 >>> --- a/fs/ocfs2/dlmglue.h >>> +++ b/fs/ocfs2/dlmglue.h >>> @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res >> *lockres, >>> int ocfs2_create_new_inode_locks(struct inode *inode); >>> int ocfs2_drop_inode_locks(struct inode *inode); >>> int ocfs2_rw_lock(struct inode *inode, int write); >>> +int ocfs2_try_rw_lock(struct inode *inode, int write); >>> void ocfs2_rw_unlock(struct inode *inode, int write); >>> int ocfs2_open_lock(struct inode *inode); >>> int ocfs2_try_open_lock(struct inode *inode, int write); >>> @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, >>> /* 99% of the time we don't want to supply any additional flags -- >>> * those are for very specific cases only. */ >>> #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, >> OI_LS_NORMAL) >>> +#define ocfs2_try_inode_lock(i, b, e)\ >>> + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ >>> + OI_LS_NORMAL) >>> void ocfs2_inode_unlock(struct inode *inode, >>> int ex); >>> int ocfs2_super_lock(struct ocfs2_super *osb, >>> > >
Hi Changwei, >>> > Hi Gang, > > On 2017/11/30 10:45, Gang He wrote: >> Hello Changwei, >> >> >>>>> >>> On 2017/11/29 16:38, Gang He wrote: >>>> Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which >>>> will be used in non-block IO scenarios. >>>> >>>> Signed-off-by: Gang He <ghe@suse.com> >>>> --- >>>> fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ >>>> fs/ocfs2/dlmglue.h | 4 ++++ >>>> 2 files changed, 25 insertions(+) >>>> >>>> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c >>>> index 4689940..a68efa3 100644 >>>> --- a/fs/ocfs2/dlmglue.c >>>> +++ b/fs/ocfs2/dlmglue.c >>>> @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) >>>> return status; >>>> } >>>> >>>> +int ocfs2_try_rw_lock(struct inode *inode, int write) >>>> +{ >>>> + int status, level; >>>> + struct ocfs2_lock_res *lockres; >>>> + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); >>>> + >>>> + mlog(0, "inode %llu try to take %s RW lock\n", >>>> + (unsigned long long)OCFS2_I(inode)->ip_blkno, >>>> + write ? "EXMODE" : "PRMODE"); >>>> + >>>> + if (ocfs2_mount_local(osb)) >>>> + return 0; >>>> + >>>> + lockres = &OCFS2_I(inode)->ip_rw_lockres; >>>> + >>>> + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >>>> + >>>> + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); >>> >>> Hi Gang, >>> Should we consider about passing a flag - OCFS2_LOCK_NONBLOCK to >>> ocfs2_cluster_lock. Otherwise a cluster locking progress may be waiting >>> for accomplishment of DC, which I think violates _NO_WAIT_ semantics. >> >> If ocfs2 is a local file system, we should not wait for any condition, but > for a cluster file system, >> we cannot avoid this totally according to the current DLM lock design, we > need to wait for a little to get lock for the first time. >> Why do we not use OCFS2_LOCK_NONBLOCK flag to get a lock? >> since this flag is not stable to get a lock no matter this lock is occupied > by other nodes, or not. > I suppose local node must be granted under the condition that it is > marked with *OCFS2_LOCK_BLOCKED*. And the control flag > _OCFS2_LOCK_NONBLOCK_ will make lock progress directly return -EAGAIN > without any waiting. > >> If you use OCFS2_LOCK_NONBLOCK flag to get a fresh lock, you possibly fail > or success, depends on when the lock acquisition callback happens. >> So, I think DLM_LKF_NOQUEUE flag should be more matched to _NO_WAIT_ > semantics. > > I thinks OCFS2_LOCK_NONBLOCK doesn't conflict DLM_LKF_NOQUEUE, they are > the forth and fifth argument respectively. Two arguments doesn't conflict, but the _OCFS2_LOCK_NONBLOCK_ flag will bring the uncertainty of lock acquisition, since depends on when the lock acquisition callback happens. In the other words, you possibly do not get a lock for one time if passing the _OCFS2_LOCK_NONBLOCK_ flag. I think that this flag is suitable to ocfs2_inode_lock_with_page case, since when we can not get the lock immediately, we can try it again and again. In actually, introducing this flag is to avoid a dead-lock case, a very tricky case. Thanks Gang > >> we always get a fresh lock successfully, always failed if the lock is/was > occupied by other nodes. > > What do you mean by a fresh lock? A lock that is never granted or > acquired? If a lock is marked with OCFS2_LOCK_BLOCKED, local node must > has acquired it. > > Thanks, > Changwei > >> This flag can give us a consistent locking behavior. >> >> Thanks >> Gang >> >> >> >>> >>> Thanks, >>> Changwei. >>> >>>> + return status; >>>> +} >>>> + >>>> void ocfs2_rw_unlock(struct inode *inode, int write) >>>> { >>>> int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; >>>> diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h >>>> index a7fc18b..05910fc 100644 >>>> --- a/fs/ocfs2/dlmglue.h >>>> +++ b/fs/ocfs2/dlmglue.h >>>> @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res >>> *lockres, >>>> int ocfs2_create_new_inode_locks(struct inode *inode); >>>> int ocfs2_drop_inode_locks(struct inode *inode); >>>> int ocfs2_rw_lock(struct inode *inode, int write); >>>> +int ocfs2_try_rw_lock(struct inode *inode, int write); >>>> void ocfs2_rw_unlock(struct inode *inode, int write); >>>> int ocfs2_open_lock(struct inode *inode); >>>> int ocfs2_try_open_lock(struct inode *inode, int write); >>>> @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, >>>> /* 99% of the time we don't want to supply any additional flags -- >>>> * those are for very specific cases only. */ >>>> #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, > 0, >>> OI_LS_NORMAL) >>>> +#define ocfs2_try_inode_lock(i, b, e)\ >>>> + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ >>>> + OI_LS_NORMAL) >>>> void ocfs2_inode_unlock(struct inode *inode, >>>> int ex); >>>> int ocfs2_super_lock(struct ocfs2_super *osb, >>>> >> >>
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 4689940..a68efa3 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, int write) return status; } +int ocfs2_try_rw_lock(struct inode *inode, int write) +{ + int status, level; + struct ocfs2_lock_res *lockres; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + mlog(0, "inode %llu try to take %s RW lock\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + write ? "EXMODE" : "PRMODE"); + + if (ocfs2_mount_local(osb)) + return 0; + + lockres = &OCFS2_I(inode)->ip_rw_lockres; + + level = write ? DLM_LOCK_EX : DLM_LOCK_PR; + + status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); + return status; +} + void ocfs2_rw_unlock(struct inode *inode, int write) { int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h index a7fc18b..05910fc 100644 --- a/fs/ocfs2/dlmglue.h +++ b/fs/ocfs2/dlmglue.h @@ -116,6 +116,7 @@ void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, int ocfs2_create_new_inode_locks(struct inode *inode); int ocfs2_drop_inode_locks(struct inode *inode); int ocfs2_rw_lock(struct inode *inode, int write); +int ocfs2_try_rw_lock(struct inode *inode, int write); void ocfs2_rw_unlock(struct inode *inode, int write); int ocfs2_open_lock(struct inode *inode); int ocfs2_try_open_lock(struct inode *inode, int write); @@ -140,6 +141,9 @@ int ocfs2_inode_lock_with_page(struct inode *inode, /* 99% of the time we don't want to supply any additional flags -- * those are for very specific cases only. */ #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL) +#define ocfs2_try_inode_lock(i, b, e)\ + ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\ + OI_LS_NORMAL) void ocfs2_inode_unlock(struct inode *inode, int ex); int ocfs2_super_lock(struct ocfs2_super *osb,
Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which will be used in non-block IO scenarios. Signed-off-by: Gang He <ghe@suse.com> --- fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ fs/ocfs2/dlmglue.h | 4 ++++ 2 files changed, 25 insertions(+)