[PATCH 2/3] f2fs: move release of block devices to after kill_block_super()

Eric Biggers
2023-12-13T04:01:15Z

From: Eric Biggers <ebiggers@google.com>

Call destroy_device_list() and free the f2fs_sb_info from
kill_f2fs_super(), after the call to kill_block_super(). This is
necessary to order it after the call to fscrypt_destroy_keyring() once
generic_shutdown_super() starts calling fscrypt_destroy_keyring() just
after calling ->put_super. This is because fscrypt_destroy_keyring()
may call into f2fs_get_devices() via the fscrypt_operations.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
fs/f2fs/super.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 033af907c3b1d..ba95a341a9a36 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1710,42 +1710,39 @@ static void f2fs_put_super(struct super_block *sb)
f2fs_destroy_node_manager(sbi);
f2fs_destroy_segment_manager(sbi);

/* flush s_error_work before sbi destroy */
flush_work(&sbi->s_error_work);

f2fs_destroy_post_read_wq(sbi);

kvfree(sbi->ckpt);

- sb->s_fs_info = NULL;
if (sbi->s_chksum_driver)
crypto_free_shash(sbi->s_chksum_driver);
kfree(sbi->raw_super);

- destroy_device_list(sbi);
f2fs_destroy_page_array_cache(sbi);
f2fs_destroy_xattr_caches(sbi);
mempool_destroy(sbi->write_io_dummy);
#ifdef CONFIG_QUOTA
for (i = 0; i < MAXQUOTAS; i++)
kfree(F2FS_OPTION(sbi).s_qf_names[i]);
#endif
fscrypt_free_dummy_policy(&F2FS_OPTION(sbi).dummy_enc_policy);
destroy_percpu_info(sbi);
f2fs_destroy_iostat(sbi);
for (i = 0; i < NR_PAGE_TYPE; i++)
kvfree(sbi->write_io[i]);
#if IS_ENABLED(CONFIG_UNICODE)
utf8_unload(sb->s_encoding);
#endif
- kfree(sbi);
}

int f2fs_sync_fs(struct super_block *sb, int sync)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
int err = 0;

if (unlikely(f2fs_cp_error(sbi)))
return 0;
if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
@@ -4895,23 +4892,23 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
}

static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
}

static void kill_f2fs_super(struct super_block *sb)
{
- if (sb->s_root) {
- struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);

+ if (sb->s_root) {
set_sbi_flag(sbi, SBI_IS_CLOSE);
f2fs_stop_gc_thread(sbi);
f2fs_stop_discard_thread(sbi);

#ifdef CONFIG_F2FS_FS_COMPRESSION
/*
* latter evict_inode() can bypass checking and invalidating
* compress inode cache.
*/
if (test_opt(sbi, COMPRESS_CACHE))
@@ -4924,20 +4921,25 @@ static void kill_f2fs_super(struct super_block *sb)
.reason = CP_UMOUNT,
};
stat_inc_cp_call_count(sbi, TOTAL_CALL);
f2fs_write_checkpoint(sbi, &cpc);
}

if (is_sbi_flag_set(sbi, SBI_IS_RECOVERED) && f2fs_readonly(sb))
sb->s_flags &= ~SB_RDONLY;
}
kill_block_super(sb);
+ if (sbi) {
+ destroy_device_list(sbi);
+ kfree(sbi);
+ sb->s_fs_info = NULL;
+ }
}

static struct file_system_type f2fs_fs_type = {
.owner = THIS_MODULE,
.name = "f2fs",
.mount = f2fs_mount,
.kill_sb = kill_f2fs_super,
.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
};
MODULE_ALIAS_FS("f2fs");
--
2.43.0