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hfsplus: switch to rcu-delayed unloading of nls and freeing ->s_fs_info 

->d_hash() and ->d_compare() use those, so we need to delay freeing
them.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2023-09-19 20:18:59 -04:00
parent a13d1a4de3
commit af072cf683
2 changed files with 10 additions and 3 deletions
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1
fs/hfsplus/hfsplus_fs.h
View File

@ -190,6 +190,7 @@ struct hfsplus_sb_info {
int work_queued; /* non-zero delayed work is queued */
struct delayed_work sync_work; /* FS sync delayed work */
spinlock_t work_lock; /* protects sync_work and work_queued */
struct rcu_head rcu;
};
#define HFSPLUS_SB_WRITEBACKUP 0

12
fs/hfsplus/super.c
View File

@ -277,6 +277,14 @@ void hfsplus_mark_mdb_dirty(struct super_block *sb)
spin_unlock(&sbi->work_lock);
}
static void delayed_free(struct rcu_head *p)
{
struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu);
unload_nls(sbi->nls);
kfree(sbi);
}
static void hfsplus_put_super(struct super_block *sb)
{
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
@ -302,9 +310,7 @@ static void hfsplus_put_super(struct super_block *sb)
hfs_btree_close(sbi->ext_tree);
kfree(sbi->s_vhdr_buf);
kfree(sbi->s_backup_vhdr_buf);
unload_nls(sbi->nls);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
call_rcu(&sbi->rcu, delayed_free);
}
static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)