lkml.org 
[lkml]   [2008]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 05/30] ocfs2: Remove data locks
Date
The meta lock now covers both meta data and data, so this just removes the
now-redundant data lock.

Combining locks saves us a round of lock mastery per inode and one less lock
to ping between nodes during read/write.

We don't lose much - since meta locks were always held before a data lock
(and at the same level) ordered writeout mode (the default) ensured that
flushing for the meta data lock also pushed out data anyways.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---
fs/ocfs2/aops.c | 44 +----------------
fs/ocfs2/cluster/tcp_internal.h | 5 ++-
fs/ocfs2/dlmglue.c | 104 ---------------------------------------
fs/ocfs2/dlmglue.h | 11 +----
fs/ocfs2/file.c | 55 ++++++---------------
fs/ocfs2/inode.c | 6 --
fs/ocfs2/inode.h | 1 -
fs/ocfs2/mmap.c | 9 ---
fs/ocfs2/super.c | 1 -
9 files changed, 22 insertions(+), 214 deletions(-)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 56f7790..5fc27cf 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -305,21 +305,12 @@ static int ocfs2_readpage(struct file *file, struct page *page)
goto out_alloc;
}

- ret = ocfs2_data_lock_with_page(inode, 0, page);
- if (ret != 0) {
- if (ret == AOP_TRUNCATED_PAGE)
- unlock = 0;
- mlog_errno(ret);
- goto out_alloc;
- }
-
if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
ret = ocfs2_readpage_inline(inode, page);
else
ret = block_read_full_page(page, ocfs2_get_block);
unlock = 0;

- ocfs2_data_unlock(inode, 0);
out_alloc:
up_read(&OCFS2_I(inode)->ip_alloc_sem);
out_meta_unlock:
@@ -638,34 +629,12 @@ static ssize_t ocfs2_direct_IO(int rw,
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
return 0;

- if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
- /*
- * We get PR data locks even for O_DIRECT. This
- * allows concurrent O_DIRECT I/O but doesn't let
- * O_DIRECT with extending and buffered zeroing writes
- * race. If they did race then the buffered zeroing
- * could be written back after the O_DIRECT I/O. It's
- * one thing to tell people not to mix buffered and
- * O_DIRECT writes, but expecting them to understand
- * that file extension is also an implicit buffered
- * write is too much. By getting the PR we force
- * writeback of the buffered zeroing before
- * proceeding.
- */
- ret = ocfs2_data_lock(inode, 0);
- if (ret < 0) {
- mlog_errno(ret);
- goto out;
- }
- ocfs2_data_unlock(inode, 0);
- }
-
ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
inode->i_sb->s_bdev, iov, offset,
nr_segs,
ocfs2_direct_IO_get_blocks,
ocfs2_dio_end_io);
-out:
+
mlog_exit(ret);
return ret;
}
@@ -1769,25 +1738,17 @@ static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
*/
down_write(&OCFS2_I(inode)->ip_alloc_sem);

- ret = ocfs2_data_lock(inode, 1);
- if (ret) {
- mlog_errno(ret);
- goto out_fail;
- }
-
ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep,
fsdata, di_bh, NULL);
if (ret) {
mlog_errno(ret);
- goto out_fail_data;
+ goto out_fail;
}

brelse(di_bh);

return 0;

-out_fail_data:
- ocfs2_data_unlock(inode, 1);
out_fail:
up_write(&OCFS2_I(inode)->ip_alloc_sem);

@@ -1908,7 +1869,6 @@ static int ocfs2_write_end(struct file *file, struct address_space *mapping,

ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);

- ocfs2_data_unlock(inode, 1);
up_write(&OCFS2_I(inode)->ip_alloc_sem);
ocfs2_meta_unlock(inode, 1);

diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h
index 79bd666..b2e832a 100644
--- a/fs/ocfs2/cluster/tcp_internal.h
+++ b/fs/ocfs2/cluster/tcp_internal.h
@@ -38,6 +38,9 @@
* locking semantics of the file system using the protocol. It should
* be somewhere else, I'm sure, but right now it isn't.
*
+ * New in version 10:
+ * - Meta/data locks combined
+ *
* New in version 9:
* - All votes removed
*
@@ -63,7 +66,7 @@
* - full 64 bit i_size in the metadata lock lvbs
* - introduction of "rw" lock and pushing meta/data locking down
*/
-#define O2NET_PROTOCOL_VERSION 9ULL
+#define O2NET_PROTOCOL_VERSION 10ULL
struct o2net_handshake {
__be64 protocol_version;
__be64 connector_id;
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 840aeda..adc8f6e 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -232,12 +232,6 @@ static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};

-static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
- .get_osb = ocfs2_get_inode_osb,
- .downconvert_worker = ocfs2_data_convert_worker,
- .flags = 0,
-};
-
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
.flags = LOCK_TYPE_REQUIRES_REFRESH,
};
@@ -261,7 +255,6 @@ static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_META ||
- lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
lockres->l_type == OCFS2_LOCK_TYPE_RW ||
lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
}
@@ -405,9 +398,6 @@ void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
case OCFS2_LOCK_TYPE_META:
ops = &ocfs2_inode_meta_lops;
break;
- case OCFS2_LOCK_TYPE_DATA:
- ops = &ocfs2_inode_data_lops;
- break;
case OCFS2_LOCK_TYPE_OPEN:
ops = &ocfs2_inode_open_lops;
break;
@@ -1154,12 +1144,6 @@ int ocfs2_create_new_inode_locks(struct inode *inode)
goto bail;
}

- ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
- if (ret) {
- mlog_errno(ret);
- goto bail;
- }
-
ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
if (ret) {
mlog_errno(ret);
@@ -1312,67 +1296,6 @@ out:
mlog_exit_void();
}

-int ocfs2_data_lock_full(struct inode *inode,
- int write,
- int arg_flags)
-{
- int status = 0, level;
- struct ocfs2_lock_res *lockres;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-
- BUG_ON(!inode);
-
- mlog_entry_void();
-
- mlog(0, "inode %llu take %s DATA lock\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- write ? "EXMODE" : "PRMODE");
-
- /* We'll allow faking a readonly data lock for
- * rodevices. */
- if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
- if (write) {
- status = -EROFS;
- mlog_errno(status);
- }
- goto out;
- }
-
- if (ocfs2_mount_local(osb))
- goto out;
-
- lockres = &OCFS2_I(inode)->ip_data_lockres;
-
- level = write ? LKM_EXMODE : LKM_PRMODE;
-
- status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
- 0, arg_flags);
- if (status < 0 && status != -EAGAIN)
- mlog_errno(status);
-
-out:
- mlog_exit(status);
- return status;
-}
-
-/* see ocfs2_meta_lock_with_page() */
-int ocfs2_data_lock_with_page(struct inode *inode,
- int write,
- struct page *page)
-{
- int ret;
-
- ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
- if (ret == -EAGAIN) {
- unlock_page(page);
- if (ocfs2_data_lock(inode, write) == 0)
- ocfs2_data_unlock(inode, write);
- ret = AOP_TRUNCATED_PAGE;
- }
-
- return ret;
-}
-
static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
@@ -1404,26 +1327,6 @@ static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
mlog_exit_void();
}

-void ocfs2_data_unlock(struct inode *inode,
- int write)
-{
- int level = write ? LKM_EXMODE : LKM_PRMODE;
- struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-
- mlog_entry_void();
-
- mlog(0, "inode %llu drop %s DATA lock\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- write ? "EXMODE" : "PRMODE");
-
- if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
- !ocfs2_mount_local(osb))
- ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
-
- mlog_exit_void();
-}
-
#define OCFS2_SEC_BITS 34
#define OCFS2_SEC_SHIFT (64 - 34)
#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
@@ -2592,13 +2495,6 @@ int ocfs2_drop_inode_locks(struct inode *inode)
status = err;

err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
- &OCFS2_I(inode)->ip_data_lockres);
- if (err < 0)
- mlog_errno(err);
- if (err < 0 && !status)
- status = err;
-
- err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
&OCFS2_I(inode)->ip_meta_lockres);
if (err < 0)
mlog_errno(err);
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 931f6ee..3fd7729 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -49,7 +49,7 @@ struct ocfs2_meta_lvb {
__be32 lvb_reserved2;
};

-/* ocfs2_meta_lock_full() and ocfs2_data_lock_full() 'arg_flags' flags */
+/* ocfs2_meta_lock_full() 'arg_flags' flags */
/* don't wait on recovery. */
#define OCFS2_META_LOCK_RECOVERY (0x01)
/* Instruct the dlm not to queue ourselves on the other node. */
@@ -69,15 +69,6 @@ void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
int ocfs2_create_new_inode_locks(struct inode *inode);
int ocfs2_drop_inode_locks(struct inode *inode);
-int ocfs2_data_lock_full(struct inode *inode,
- int write,
- int arg_flags);
-#define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0)
-int ocfs2_data_lock_with_page(struct inode *inode,
- int write,
- struct page *page);
-void ocfs2_data_unlock(struct inode *inode,
- int write);
int ocfs2_rw_lock(struct inode *inode, int write);
void ocfs2_rw_unlock(struct inode *inode, int write);
int ocfs2_open_lock(struct inode *inode);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index b75b2e1..c5c183a 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -382,18 +382,13 @@ static int ocfs2_truncate_file(struct inode *inode,

down_write(&OCFS2_I(inode)->ip_alloc_sem);

- /* This forces other nodes to sync and drop their pages. Do
- * this even if we have a truncate without allocation change -
- * ocfs2 cluster sizes can be much greater than page size, so
- * we have to truncate them anyway. */
- status = ocfs2_data_lock(inode, 1);
- if (status < 0) {
- up_write(&OCFS2_I(inode)->ip_alloc_sem);
-
- mlog_errno(status);
- goto bail;
- }
-
+ /*
+ * The inode lock forced other nodes to sync and drop their
+ * pages, which (correctly) happens even if we have a truncate
+ * without allocation change - ocfs2 cluster sizes can be much
+ * greater than page size, so we have to truncate them
+ * anyway.
+ */
unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
truncate_inode_pages(inode->i_mapping, new_i_size);

@@ -403,7 +398,7 @@ static int ocfs2_truncate_file(struct inode *inode,
if (status)
mlog_errno(status);

- goto bail_unlock_data;
+ goto bail_unlock_sem;
}

/* alright, we're going to need to do a full blown alloc size
@@ -413,25 +408,23 @@ static int ocfs2_truncate_file(struct inode *inode,
status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
if (status < 0) {
mlog_errno(status);
- goto bail_unlock_data;
+ goto bail_unlock_sem;
}

status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc);
if (status < 0) {
mlog_errno(status);
- goto bail_unlock_data;
+ goto bail_unlock_sem;
}

status = ocfs2_commit_truncate(osb, inode, di_bh, tc);
if (status < 0) {
mlog_errno(status);
- goto bail_unlock_data;
+ goto bail_unlock_sem;
}

/* TODO: orphan dir cleanup here. */
-bail_unlock_data:
- ocfs2_data_unlock(inode, 1);
-
+bail_unlock_sem:
up_write(&OCFS2_I(inode)->ip_alloc_sem);

bail:
@@ -917,7 +910,7 @@ static int ocfs2_extend_file(struct inode *inode,
struct buffer_head *di_bh,
u64 new_i_size)
{
- int ret = 0, data_locked = 0;
+ int ret = 0;
struct ocfs2_inode_info *oi = OCFS2_I(inode);

BUG_ON(!di_bh);
@@ -943,20 +936,6 @@ static int ocfs2_extend_file(struct inode *inode,
&& ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
goto out_update_size;

- /*
- * protect the pages that ocfs2_zero_extend is going to be
- * pulling into the page cache.. we do this before the
- * metadata extend so that we don't get into the situation
- * where we've extended the metadata but can't get the data
- * lock to zero.
- */
- ret = ocfs2_data_lock(inode, 1);
- if (ret < 0) {
- mlog_errno(ret);
- goto out;
- }
- data_locked = 1;
-
/*
* The alloc sem blocks people in read/write from reading our
* allocation until we're done changing it. We depend on
@@ -980,7 +959,7 @@ static int ocfs2_extend_file(struct inode *inode,
up_write(&oi->ip_alloc_sem);

mlog_errno(ret);
- goto out_unlock;
+ goto out;
}
}

@@ -991,7 +970,7 @@ static int ocfs2_extend_file(struct inode *inode,

if (ret < 0) {
mlog_errno(ret);
- goto out_unlock;
+ goto out;
}

out_update_size:
@@ -999,10 +978,6 @@ out_update_size:
if (ret < 0)
mlog_errno(ret);

-out_unlock:
- if (data_locked)
- ocfs2_data_unlock(inode, 1);
-
out:
return ret;
}
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 86cf073..8ff201d 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -332,10 +332,6 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
OCFS2_LOCK_TYPE_RW, inode->i_generation,
inode);

- ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_data_lockres,
- OCFS2_LOCK_TYPE_DATA, inode->i_generation,
- inode);
-
ocfs2_set_inode_flags(inode);

status = 0;
@@ -1014,7 +1010,6 @@ void ocfs2_clear_inode(struct inode *inode)
* the downconvert thread while waiting to destroy the locks. */
ocfs2_mark_lockres_freeing(&oi->ip_rw_lockres);
ocfs2_mark_lockres_freeing(&oi->ip_meta_lockres);
- ocfs2_mark_lockres_freeing(&oi->ip_data_lockres);
ocfs2_mark_lockres_freeing(&oi->ip_open_lockres);

/* We very well may get a clear_inode before all an inodes
@@ -1038,7 +1033,6 @@ void ocfs2_clear_inode(struct inode *inode)

ocfs2_lock_res_free(&oi->ip_rw_lockres);
ocfs2_lock_res_free(&oi->ip_meta_lockres);
- ocfs2_lock_res_free(&oi->ip_data_lockres);
ocfs2_lock_res_free(&oi->ip_open_lockres);

ocfs2_metadata_cache_purge(inode);
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 70e881c..d1c54da 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -35,7 +35,6 @@ struct ocfs2_inode_info

struct ocfs2_lock_res ip_rw_lockres;
struct ocfs2_lock_res ip_meta_lockres;
- struct ocfs2_lock_res ip_data_lockres;
struct ocfs2_lock_res ip_open_lockres;

/* protects allocation changes on this inode. */
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index 9875615..a7f0ccc 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -181,17 +181,8 @@ static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
*/
down_write(&OCFS2_I(inode)->ip_alloc_sem);

- ret = ocfs2_data_lock(inode, 1);
- if (ret < 0) {
- mlog_errno(ret);
- goto out_meta_unlock;
- }
-
ret = __ocfs2_page_mkwrite(inode, di_bh, page);

- ocfs2_data_unlock(inode, 1);
-
-out_meta_unlock:
up_write(&OCFS2_I(inode)->ip_alloc_sem);

brelse(di_bh);
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 1996820..064eba0 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1020,7 +1020,6 @@ static void ocfs2_inode_init_once(struct kmem_cache *cachep, void *data)

ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
- ocfs2_lock_res_init_once(&oi->ip_data_lockres);
ocfs2_lock_res_init_once(&oi->ip_open_lockres);

ocfs2_metadata_cache_init(&oi->vfs_inode);
--
1.5.3.6


\
 
 \ /
  Last update: 2008-01-17 23:45    [W:0.150 / U:3.636 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site