[PATCH 20/29] ext4: cleanup the dax handling in ext4_fill_super

Christoph Hellwig
2021-11-09T08:34:08Z

Only call fs_dax_get_by_bdev once the sbi has been allocated and remove
the need for the dax_dev local variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/ext4/super.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index eb4df43abd76e..b60401bb1c310 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3879,7 +3879,6 @@ static void ext4_setup_csum_trigger(struct super_block *sb,

static int ext4_fill_super(struct super_block *sb, void *data, int silent)
{
- struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
char *orig_data = kstrdup(data, GFP_KERNEL);
struct buffer_head *bh, **group_desc;
struct ext4_super_block *es = NULL;
@@ -3910,12 +3909,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
if ((data && !orig_data) || !sbi)
goto out_free_base;

- sbi->s_daxdev = dax_dev;
sbi->s_blockgroup_lock =
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
if (!sbi->s_blockgroup_lock)
goto out_free_base;

+ sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev);
sb->s_fs_info = sbi;
sbi->s_sb = sb;
sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
@@ -4300,7 +4299,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto failed_mount;
}

- if (dax_dev) {
+ if (sbi->s_daxdev) {
if (blocksize == PAGE_SIZE)
set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
else
@@ -5096,10 +5095,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
out_fail:
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
+ fs_put_dax(sbi->s_daxdev );
out_free_base:
kfree(sbi);
kfree(orig_data);
- fs_put_dax(dax_dev);
return err ? err : ret;
}

--
2.30.2