From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
dio_sem can be eliminated because all DIO synchronization is performed
through inode->i_rwsem now.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
fs/btrfs/btrfs_inode.h | 10 ----------
fs/btrfs/file.c | 13 -------------
fs/btrfs/inode.c | 1 -
3 files changed, 24 deletions(-)
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 738009a22320..176abce59467 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -203,16 +203,6 @@ struct btrfs_inode {
/* Hook into fs_info->delayed_iputs */
struct list_head delayed_iput;
- /*
- * To avoid races between lockless (i_mutex not held) direct IO writes
- * and concurrent fsync requests. Direct IO writes must acquire read
- * access on this semaphore for creating an extent map and its
- * corresponding ordered extent. The fast fsync path must acquire write
- * access on this semaphore before it collects ordered extents and
- * extent maps.
- */
- struct rw_semaphore dio_sem;
-
struct inode vfs_inode;
};
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 50092d24eee2..193af84f5405 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2022,8 +2022,6 @@ static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
goto buffered;
}
- down_read(&BTRFS_I(inode)->dio_sem);
-
/*
* We have are actually a sync iocb, so we need our fancy endio to know
* if we need to sync.
@@ -2038,7 +2036,6 @@ static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
if (written == -ENOTBLK)
written = 0;
- up_read(&BTRFS_I(inode)->dio_sem);
btrfs_inode_unlock(inode, ilock_flags);
if (written < 0 || !iov_iter_count(from)) {
@@ -2248,13 +2245,6 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
inode_lock(inode);
- /*
- * We take the dio_sem here because the tree log stuff can race with
- * lockless dio writes and get an extent map logged for an extent we
- * never waited on. We need it this high up for lockdep reasons.
- */
- down_write(&BTRFS_I(inode)->dio_sem);
-
atomic_inc(&root->log_batch);
/*
@@ -2285,7 +2275,6 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
*/
ret = start_ordered_ops(inode, start, end);
if (ret) {
- up_write(&BTRFS_I(inode)->dio_sem);
inode_unlock(inode);
goto out;
}
@@ -2382,7 +2371,6 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
* file again, but that will end up using the synchronization
* inside btrfs_sync_log to keep things safe.
*/
- up_write(&BTRFS_I(inode)->dio_sem);
inode_unlock(inode);
if (ret != BTRFS_NO_LOG_SYNC) {
@@ -2413,7 +2401,6 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
out_release_extents:
btrfs_release_log_ctx_extents(&ctx);
- up_write(&BTRFS_I(inode)->dio_sem);
inode_unlock(inode);
goto out;
}
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f305efac75ae..96ff8e4a3b45 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8580,7 +8580,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
INIT_LIST_HEAD(&ei->delalloc_inodes);
INIT_LIST_HEAD(&ei->delayed_iput);
RB_CLEAR_NODE(&ei->rb_node);
- init_rwsem(&ei->dio_sem);
return inode;
}
--
2.26.2
