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authorWeiWei Wang <wangww631@huawei.com>2015-06-25 02:55:15 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 03:49:39 +0300
commitfa5a0eb3b074ca89690da3e13cf44b6bab3f024c (patch)
tree7815cf66faf228fba30ae876b197a6cd6b0d048b /fs/ocfs2
parente272e7f0fbfbe4e6e5d89cd61064d6dddd73e81b (diff)
downloadlinux-fa5a0eb3b074ca89690da3e13cf44b6bab3f024c.tar.xz
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 <wangww631@huawei.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/aops.c3
-rw-r--r--fs/ocfs2/aops.h7
-rw-r--r--fs/ocfs2/file.c31
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);