[PATCH 19/29] ext2: cleanup the dax handling in ext2_fill_super

Christoph Hellwig
2021-11-09T08:33:59Z

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/ext2/super.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index a964066a80aa7..7e23482862e69 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -802,7 +802,6 @@ static unsigned long descriptor_loc(struct super_block *sb,

static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
- struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
struct buffer_head * bh;
struct ext2_sb_info * sbi;
struct ext2_super_block * es;
@@ -822,17 +821,17 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)

sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
- goto failed;
+ return -ENOMEM;

sbi->s_blockgroup_lock =
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
if (!sbi->s_blockgroup_lock) {
kfree(sbi);
- goto failed;
+ return -ENOMEM;
}
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
- sbi->s_daxdev = dax_dev;
+ sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev);

spin_lock_init(&sbi->s_lock);
ret = -EINVAL;
@@ -946,7 +945,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

if (test_opt(sb, DAX)) {
- if (!dax_dev) {
+ if (!sbi->s_daxdev) {
ext2_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
clear_opt(sbi->s_mount_opt, DAX);
@@ -1201,11 +1200,10 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
failed_mount:
brelse(bh);
failed_sbi:
+ fs_put_dax(sbi->s_daxdev);
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
-failed:
- fs_put_dax(dax_dev);
return ret;
}

--
2.30.2