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| author |   Gang He <ghe@suse.com> | 2018-01-31 16:15:17 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 17:18:35 -0800 |
| commit | 06e7f13d192ba9d6806f6caaf58f88b1b0b57134 (patch) | |
| tree | 4b82c2062968cd6a0aacb31a30c563a4555aacc3 /fs/ocfs2/dlmglue.c | |
| parent | ocfs2: add trimfs lock to avoid duplicated trims in cluster (diff) | |
| download | linux-dev-06e7f13d192ba9d6806f6caaf58f88b1b0b57134.tar.xz linux-dev-06e7f13d192ba9d6806f6caaf58f88b1b0b57134.zip | |
ocfs2: add ocfs2_try_rw_lock() and ocfs2_try_inode_lock()
Patch series "ocfs2: add nowait aio support", v4.
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.
[ghe@suse.com: v2]
Link: http://lkml.kernel.org/r/1511944612-9629-2-git-send-email-ghe@suse.com
Link: http://lkml.kernel.org/r/1511775987-841-2-git-send-email-ghe@suse.com
Signed-off-by: Gang He <ghe@suse.com>
Reviewed-by: Jun Piao <piaojun@huawei.com>
Acked-by: alex chen <alex.chen@huawei.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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | fs/ocfs2/dlmglue.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index f5643e3ff317..13fa809f4885 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -1764,6 +1764,27 @@ 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; |