From fa5a0eb3b074ca89690da3e13cf44b6bab3f024c Mon Sep 17 00:00:00 2001 From: WeiWei Wang Date: Wed, 24 Jun 2015 16:55:15 -0700 Subject: [PATCH] ocfs2: remove OCFS2_IOCB_SEM lock type in direct io In ocfs2 direct read/write, OCFS2_IOCB_SEM lock type is used to protect inode->i_alloc_sem rw semaphore lock in the earlier kernel version. However, in the latest kernel, inode->i_alloc_sem rw semaphore lock is not used at all, so OCFS2_IOCB_SEM lock type needs to be removed. Signed-off-by: Weiwei Wang Cc: Mark Fasheh Cc: Joel Becker Reviewed-by: Junxiao Bi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ocfs2/aops.c | 3 --- fs/ocfs2/aops.h | 7 ------- fs/ocfs2/file.c | 31 ++++--------------------------- 3 files changed, 4 insertions(+), 37 deletions(-) diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 395f4b356baa..be9905ecd2c4 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -619,9 +619,6 @@ static void ocfs2_dio_end_io(struct kiocb *iocb, /* this io's submitter should not have unlocked this before we could */ BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); - if (ocfs2_iocb_is_sem_locked(iocb)) - ocfs2_iocb_clear_sem_locked(iocb); - if (ocfs2_iocb_is_unaligned_aio(iocb)) { ocfs2_iocb_clear_unaligned_aio(iocb); diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h index dd59599b022d..24e496d6bdcd 100644 --- a/fs/ocfs2/aops.h +++ b/fs/ocfs2/aops.h @@ -79,7 +79,6 @@ static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level) enum ocfs2_iocb_lock_bits { OCFS2_IOCB_RW_LOCK = 0, OCFS2_IOCB_RW_LOCK_LEVEL, - OCFS2_IOCB_SEM, OCFS2_IOCB_UNALIGNED_IO, OCFS2_IOCB_NUM_LOCKS }; @@ -88,12 +87,6 @@ enum ocfs2_iocb_lock_bits { clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private) #define ocfs2_iocb_rw_locked_level(iocb) \ test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private) -#define ocfs2_iocb_set_sem_locked(iocb) \ - set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private) -#define ocfs2_iocb_clear_sem_locked(iocb) \ - clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private) -#define ocfs2_iocb_is_sem_locked(iocb) \ - test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private) #define ocfs2_iocb_set_unaligned_aio(iocb) \ set_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index d8b670cbd909..fbfadb289e62 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2250,7 +2250,7 @@ out: static ssize_t ocfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { - int direct_io, appending, rw_level, have_alloc_sem = 0; + int direct_io, appending, rw_level; int can_do_direct, has_refcount = 0; ssize_t written = 0; ssize_t ret; @@ -2279,16 +2279,7 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb, mutex_lock(&inode->i_mutex); - ocfs2_iocb_clear_sem_locked(iocb); - relock: - /* to match setattr's i_mutex -> rw_lock ordering */ - if (direct_io) { - have_alloc_sem = 1; - /* communicate with ocfs2_dio_end_io */ - ocfs2_iocb_set_sem_locked(iocb); - } - /* * Concurrent O_DIRECT writes are allowed with * mount_option "coherency=buffered". @@ -2298,7 +2289,7 @@ relock: ret = ocfs2_rw_lock(inode, rw_level); if (ret < 0) { mlog_errno(ret); - goto out_sems; + goto out_mutex; } /* @@ -2347,7 +2338,6 @@ relock: if (direct_io && !can_do_direct) { ocfs2_rw_unlock(inode, rw_level); - have_alloc_sem = 0; rw_level = -1; direct_io = 0; @@ -2416,7 +2406,6 @@ no_sync: */ if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) { rw_level = -1; - have_alloc_sem = 0; unaligned_dio = 0; } @@ -2429,10 +2418,7 @@ out: if (rw_level != -1) ocfs2_rw_unlock(inode, rw_level); -out_sems: - if (have_alloc_sem) - ocfs2_iocb_clear_sem_locked(iocb); - +out_mutex: mutex_unlock(&inode->i_mutex); if (written) @@ -2473,7 +2459,7 @@ bail: static ssize_t ocfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { - int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0; + int ret = 0, rw_level = -1, lock_level = 0; struct file *filp = iocb->ki_filp; struct inode *inode = file_inode(filp); @@ -2490,16 +2476,11 @@ static ssize_t ocfs2_file_read_iter(struct kiocb *iocb, goto bail; } - ocfs2_iocb_clear_sem_locked(iocb); - /* * buffered reads protect themselves in ->readpage(). O_DIRECT reads * need locks to protect pending reads from racing with truncate. */ if (iocb->ki_flags & IOCB_DIRECT) { - have_alloc_sem = 1; - ocfs2_iocb_set_sem_locked(iocb); - ret = ocfs2_rw_lock(inode, 0); if (ret < 0) { mlog_errno(ret); @@ -2535,13 +2516,9 @@ static ssize_t ocfs2_file_read_iter(struct kiocb *iocb, /* see ocfs2_file_write_iter */ if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { rw_level = -1; - have_alloc_sem = 0; } bail: - if (have_alloc_sem) - ocfs2_iocb_clear_sem_locked(iocb); - if (rw_level != -1) ocfs2_rw_unlock(inode, rw_level); -- 2.20.1