inode->i_flags locking rules suggest using the i_mutex lock. This patch
adds a helper to do the locking and setting of S_DAX on the block device
inode.
Signed-off-by: Jon Derrick <jonathan.derrick@xxxxxxxxx>
---
fs/block_dev.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index d4fa725..252e459 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1159,6 +1159,18 @@ void bd_set_size(struct block_device *bdev, loff_t size)
}
EXPORT_SYMBOL(bd_set_size);
+static void bd_set_dax(struct block_device *bdev, bool enabled)
+{
+ struct inode *inode = bdev->bd_inode;
+
+ inode_lock(inode);
+ if (enabled)
+ inode->i_flags = S_DAX;
+ else
+ inode->i_flags &= ~S_DAX;
+ inode_unlock(inode);
+}
+
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
/*
@@ -1206,9 +1218,9 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
if (IS_ENABLED(CONFIG_BLK_DEV_DAX) && disk->fops->direct_access)
- bdev->bd_inode->i_flags = S_DAX;
+ bd_set_dax(bdev, 1);
else
- bdev->bd_inode->i_flags &= ~S_DAX;
+ bd_set_dax(bdev, 0);
if (!partno) {
ret = -ENXIO;
@@ -1239,7 +1251,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!ret) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
if (!blkdev_dax_capable(bdev))
- bdev->bd_inode->i_flags &= ~S_DAX;
+ bd_set_dax(bdev, 0);
}
/*
@@ -1276,7 +1288,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
}
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
if (!blkdev_dax_capable(bdev))
- bdev->bd_inode->i_flags &= ~S_DAX;
+ bd_set_dax(bdev, 0);
}
} else {
if (bdev->bd_contains == bdev) {
--
1.8.3.1
--
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