[PATCH 06/12] fs: use the super_block as holder when mounting file systems

Christoph Hellwig
2023-08-02T15:42:41Z

The file system type is not a very useful holder as it doesn't allow us
to go back to the actual file system instance. Pass the super_block instead
which is useful when passed back to the file system driver.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/btrfs/super.c | 7 ++-----
fs/f2fs/super.c | 7 +++----
fs/super.c | 8 ++++----
3 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 5980b5dcc6b163..8a47c7f2690880 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -69,8 +69,6 @@ static const struct super_operations btrfs_super_ops;
* requested by subvol=/path. That way the callchain is straightforward and we
* don't have to play tricks with the mount options and recursive calls to
* btrfs_mount.
- *
- * The new btrfs_root_fs_type also servers as a tag for the bdev_holder.
*/
static struct file_system_type btrfs_fs_type;
static struct file_system_type btrfs_root_fs_type;
@@ -1498,8 +1496,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
} else {
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;

- error = btrfs_open_devices(fs_devices, sb_open_mode(flags),
- fs_type);
+ error = btrfs_open_devices(fs_devices, sb_open_mode(flags), s);
if (error)
goto out_deactivate;

@@ -1513,7 +1510,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
fs_devices->latest_dev->bdev);
shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", fs_type->name,
s->s_id);
- btrfs_sb(s)->bdev_holder = fs_type;
+ fs_info->bdev_holder = s;
error = btrfs_fill_super(s, fs_devices, data);
}
if (!error)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ca31163da00a55..05c90fdb7a6cca 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1561,7 +1561,7 @@ static void destroy_device_list(struct f2fs_sb_info *sbi)
int i;

for (i = 0; i < sbi->s_ndevs; i++) {
- blkdev_put(FDEV(i).bdev, sbi->sb->s_type);
+ blkdev_put(FDEV(i).bdev, sbi->sb);
#ifdef CONFIG_BLK_DEV_ZONED
kvfree(FDEV(i).blkz_seq);
#endif
@@ -4198,7 +4198,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
/* Single zoned block device mount */
FDEV(0).bdev =
blkdev_get_by_dev(sbi->sb->s_bdev->bd_dev, mode,
- sbi->sb->s_type, NULL);
+ sbi->sb, NULL);
} else {
/* Multi-device mount */
memcpy(FDEV(i).path, RDEV(i).path, MAX_PATH_LEN);
@@ -4217,8 +4217,7 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
sbi->log_blocks_per_seg) - 1;
}
FDEV(i).bdev = blkdev_get_by_path(FDEV(i).path, mode,
- sbi->sb->s_type,
- NULL);
+ sbi->sb, NULL);
}
if (IS_ERR(FDEV(i).bdev))
return PTR_ERR(FDEV(i).bdev);
diff --git a/fs/super.c b/fs/super.c
index 6aaa275fa8630d..09b65ee1a8b737 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1249,7 +1249,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
blk_mode_t mode = sb_open_mode(sb_flags);
struct block_device *bdev;

- bdev = blkdev_get_by_dev(sb->s_dev, mode, sb->s_type, &fs_holder_ops);
+ bdev = blkdev_get_by_dev(sb->s_dev, mode, sb, &fs_holder_ops);
if (IS_ERR(bdev)) {
if (fc)
errorf(fc, "%s: Can't open blockdev", fc->source);
@@ -1262,7 +1262,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
* writable from userspace even for a read-only block device.
*/
if ((mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) {
- blkdev_put(bdev, sb->s_type);
+ blkdev_put(bdev, sb);
return -EACCES;
}

@@ -1278,7 +1278,7 @@ int setup_bdev_super(struct super_block *sb, int sb_flags,
mutex_unlock(&bdev->bd_fsfreeze_mutex);
if (fc)
warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);
- blkdev_put(bdev, sb->s_type);
+ blkdev_put(bdev, sb);
return -EBUSY;
}
spin_lock(&sb_lock);
@@ -1418,7 +1418,7 @@ void kill_block_super(struct super_block *sb)
if (bdev) {
bdev->bd_super = NULL;
sync_blockdev(bdev);
- blkdev_put(bdev, sb->s_type);
+ blkdev_put(bdev, sb);
}
}

--
2.39.2