[PATCH 22/29] ext4: Convert to bdev_open_by_dev()

Jan Kara
2023-08-23T10:50:32Z

Convert ext4 to use bdev_open_by_dev() and pass the handle around.

CC: <linux-ext4@vger.kernel.org>
CC: Ted Tso <tytso@mit.edu>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/ext4/ext4.h | 2 +-
fs/ext4/fsmap.c | 9 +++++----
fs/ext4/super.c | 44 +++++++++++++++++++++++---------------------
3 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1e2259d9967d..6856e80abf70 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1541,7 +1541,7 @@ struct ext4_sb_info {
unsigned long s_commit_interval;
u32 s_max_batch_time;
u32 s_min_batch_time;
- struct block_device *s_journal_bdev;
+ struct bdev_handle *s_journal_bdev_handle;
#ifdef CONFIG_QUOTA
/* Names of quota files with journalled quota */
char __rcu *s_qf_names[EXT4_MAXQUOTAS];
diff --git a/fs/ext4/fsmap.c b/fs/ext4/fsmap.c
index cdf9bfe10137..11e6f33677a2 100644
--- a/fs/ext4/fsmap.c
+++ b/fs/ext4/fsmap.c
@@ -576,8 +576,9 @@ static bool ext4_getfsmap_is_valid_device(struct super_block *sb,
if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX ||
fm->fmr_device == new_encode_dev(sb->s_bdev->bd_dev))
return true;
- if (EXT4_SB(sb)->s_journal_bdev &&
- fm->fmr_device == new_encode_dev(EXT4_SB(sb)->s_journal_bdev->bd_dev))
+ if (EXT4_SB(sb)->s_journal_bdev_handle &&
+ fm->fmr_device ==
+ new_encode_dev(EXT4_SB(sb)->s_journal_bdev_handle->bdev->bd_dev))
return true;
return false;
}
@@ -647,9 +648,9 @@ int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
memset(handlers, 0, sizeof(handlers));
handlers[0].gfd_dev = new_encode_dev(sb->s_bdev->bd_dev);
handlers[0].gfd_fn = ext4_getfsmap_datadev;
- if (EXT4_SB(sb)->s_journal_bdev) {
+ if (EXT4_SB(sb)->s_journal_bdev_handle) {
handlers[1].gfd_dev = new_encode_dev(
- EXT4_SB(sb)->s_journal_bdev->bd_dev);
+ EXT4_SB(sb)->s_journal_bdev_handle->bdev->bd_dev);
handlers[1].gfd_fn = ext4_getfsmap_logdev;
}

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 73547d2334fd..c2f5f73ab9fc 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1100,20 +1100,20 @@ void ext4_update_dynamic_rev(struct super_block *sb)
/*
* Open the external journal device
*/
-static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
+static struct bdev_handle *ext4_blkdev_get(dev_t dev, struct super_block *sb)
{
- struct block_device *bdev;
+ struct bdev_handle *handle;

- bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE, sb,
- &fs_holder_ops);
- if (IS_ERR(bdev))
+ handle = bdev_open_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE, sb,
+ &fs_holder_ops);
+ if (IS_ERR(handle))
goto fail;
- return bdev;
+ return handle;

fail:
ext4_msg(sb, KERN_ERR,
"failed to open journal device unknown-block(%u,%u) %ld",
- MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
+ MAJOR(dev), MINOR(dev), PTR_ERR(handle));
return NULL;
}

@@ -1311,14 +1311,14 @@ static void ext4_put_super(struct super_block *sb)

sync_blockdev(sb->s_bdev);
invalidate_bdev(sb->s_bdev);
- if (sbi->s_journal_bdev) {
+ if (sbi->s_journal_bdev_handle) {
/*
* Invalidate the journal device's buffers. We don't want them
* floating about in memory - the physical journal device may
* hotswapped, and it breaks the `ro-after' testing code.
*/
- sync_blockdev(sbi->s_journal_bdev);
- invalidate_bdev(sbi->s_journal_bdev);
+ sync_blockdev(sbi->s_journal_bdev_handle->bdev);
+ invalidate_bdev(sbi->s_journal_bdev_handle->bdev);
}

ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
@@ -4205,7 +4205,7 @@ int ext4_calculate_overhead(struct super_block *sb)
* Add the internal journal blocks whether the journal has been
* loaded or not
*/
- if (sbi->s_journal && !sbi->s_journal_bdev)
+ if (sbi->s_journal && !sbi->s_journal_bdev_handle)
overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
/* j_inum for internal journal is non-zero */
@@ -5642,9 +5642,9 @@ failed_mount9: __maybe_unused
#endif
fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
brelse(sbi->s_sbh);
- if (sbi->s_journal_bdev) {
- invalidate_bdev(sbi->s_journal_bdev);
- blkdev_put(sbi->s_journal_bdev, sb);
+ if (sbi->s_journal_bdev_handle) {
+ invalidate_bdev(sbi->s_journal_bdev_handle->bdev);
+ bdev_release(sbi->s_journal_bdev_handle);
}
out_fail:
invalidate_bdev(sb->s_bdev);
@@ -5829,17 +5829,19 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
unsigned long offset;
struct ext4_super_block *es;
struct block_device *bdev;
+ struct bdev_handle *bdev_handle;

if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
return NULL;

/* see get_tree_bdev why this is needed and safe */
up_write(&sb->s_umount);
- bdev = ext4_blkdev_get(j_dev, sb);
+ bdev_handle = ext4_blkdev_get(j_dev, sb);
down_write(&sb->s_umount);
- if (bdev == NULL)
+ if (!bdev_handle)
return NULL;

+ bdev = bdev_handle->bdev;
blocksize = sb->s_blocksize;
hblock = bdev_logical_block_size(bdev);
if (blocksize < hblock) {
@@ -5903,14 +5905,14 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
be32_to_cpu(journal->j_superblock->s_nr_users));
goto out_journal;
}
- EXT4_SB(sb)->s_journal_bdev = bdev;
+ EXT4_SB(sb)->s_journal_bdev_handle = bdev_handle;
ext4_init_journal_params(sb, journal);
return journal;

out_journal:
jbd2_journal_destroy(journal);
out_bdev:
- blkdev_put(bdev, sb);
+ bdev_release(bdev_handle);
return NULL;
}

@@ -7258,12 +7260,12 @@ static inline int ext3_feature_set_ok(struct super_block *sb)
static void ext4_kill_sb(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
- struct block_device *journal_bdev = sbi ? sbi->s_journal_bdev : NULL;
+ struct bdev_handle *handle = sbi ? sbi->s_journal_bdev_handle : NULL;

kill_block_super(sb);

- if (journal_bdev)
- blkdev_put(journal_bdev, sb);
+ if (handle)
+ bdev_release(handle);
}

static struct file_system_type ext4_fs_type = {
--
2.35.3