| Message ID | 20230831053157.256319-5-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/4] ramfs: free sb->s_fs_info after shutting down the super block | expand |
On Thu, Aug 31, 2023 at 07:31:57AM +0200, Christoph Hellwig wrote: > sb->s_fs_info can only be safely freed after generic_shutdown_super was > called and all access to the super_block has stopped. > > Thus only free the private data after calling kill_litter_super, which > calls generic_shutdown_super internally. Same as for ramfs. We *do* use ->s_fs_info there, but only for operations that require an active reference. They can't overlap with ->kill_sb().
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c index ada83149932fec..dbe8a7dcafa922 100644 --- a/arch/s390/hypfs/inode.c +++ b/arch/s390/hypfs/inode.c @@ -329,9 +329,8 @@ static void hypfs_kill_super(struct super_block *sb) hypfs_delete_tree(sb->s_root); if (sb_info && sb_info->update_file) hypfs_remove(sb_info->update_file); - kfree(sb->s_fs_info); - sb->s_fs_info = NULL; kill_litter_super(sb); + kfree(sb->s_fs_info); } static struct dentry *hypfs_create_file(struct dentry *parent, const char *name,
sb->s_fs_info can only be safely freed after generic_shutdown_super was called and all access to the super_block has stopped. Thus only free the private data after calling kill_litter_super, which calls generic_shutdown_super internally. Also remove the pointless clearing of sb->s_fs_info as the super_block can't be accessed at this point and will be freed immediately. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/s390/hypfs/inode.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)