Looks good to me. On 2017/12/1 6:24, a...@linux-foundation.org wrote: > From: Gang He <g...@suse.com> > Subject: ocfs2: add ocfs2_try_rw_lock() and ocfs2_try_inode_lock() > > Patch series "ocfs2: add nowait aio support". > > VFS layer has introduced the non-blocking aio flag IOCB_NOWAIT, which > tells the kernel to bail out if an AIO request will block for reasons such > as file allocations, or writeback triggering, or would block while > allocating requests while performing direct I/O. > > Subsequently, pwritev2/preadv2 also can leverage this part of kernel code. > So far, ext4/xfs/btrfs have supported this feature. Add the related code > for the ocfs2 file system. > > > This patch (of 3): > > Add ocfs2_try_rw_lock and ocfs2_try_inode_lock functions, which will be > used in non-blocking IO scenarios. > > [g...@suse.com: v2] > Link: > https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511944612-2D9629-2D2-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=W4UpDjVlWv5DIIPCelEteB-SienntqWxnPDHSOG7DBo&s=O9wstNpVrzaQNqjJyE21XFRb16ul0wQp9AtfJ4Jr9hI&e= > Link: > https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511775987-2D841-2D2-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=W4UpDjVlWv5DIIPCelEteB-SienntqWxnPDHSOG7DBo&s=fhdJtmG-qeTxswCoTvc42Is_mJIFHda4B0pHag4jzFk&e= > Signed-off-by: Gang He <g...@suse.com> Reviewed-by: Alex Chen <alex.c...@huawei.com> > Cc: Mark Fasheh <mfas...@versity.com> > Cc: Joel Becker <jl...@evilplan.org> > Cc: Junxiao Bi <junxiao...@oracle.com> > Cc: Joseph Qi <jiangqi...@gmail.com> > Cc: Changwei Ge <ge.chang...@h3c.com> > Signed-off-by: Andrew Morton <a...@linux-foundation.org> > --- > > fs/ocfs2/dlmglue.c | 21 +++++++++++++++++++++ > fs/ocfs2/dlmglue.h | 4 ++++ > 2 files changed, 25 insertions(+) > > diff -puN > fs/ocfs2/dlmglue.c~ocfs2-add-ocfs2_try_rw_lock-and-ocfs2_try_inode_lock > fs/ocfs2/dlmglue.c > --- a/fs/ocfs2/dlmglue.c~ocfs2-add-ocfs2_try_rw_lock-and-ocfs2_try_inode_lock > +++ a/fs/ocfs2/dlmglue.c > @@ -1742,6 +1742,27 @@ int ocfs2_rw_lock(struct inode *inode, i > 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 -puN > fs/ocfs2/dlmglue.h~ocfs2-add-ocfs2_try_rw_lock-and-ocfs2_try_inode_lock > fs/ocfs2/dlmglue.h > --- a/fs/ocfs2/dlmglue.h~ocfs2-add-ocfs2_try_rw_lock-and-ocfs2_try_inode_lock > +++ a/fs/ocfs2/dlmglue.h > @@ -116,6 +116,7 @@ void ocfs2_lock_res_free(struct ocfs2_lo > 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 in > /* 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, > _ > > _______________________________________________ > Ocfs2-devel mailing list > Ocfs2-devel@oss.oracle.com > https://oss.oracle.com/mailman/listinfo/ocfs2-devel > > . >
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