diff options
Diffstat (limited to 'fs/kernfs/mount.c')
| -rw-r--r-- | fs/kernfs/mount.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index 6a5f04ac8704..d171b98a6cdd 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -62,15 +62,16 @@ struct kernfs_root *kernfs_root_from_sb(struct super_block *sb) return NULL; } -static int kernfs_fill_super(struct super_block *sb) +static int kernfs_fill_super(struct super_block *sb, unsigned long magic) { struct kernfs_super_info *info = kernfs_info(sb); struct inode *inode; struct dentry *root; + info->sb = sb; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; - sb->s_magic = SYSFS_MAGIC; + sb->s_magic = magic; sb->s_op = &kernfs_sops; sb->s_time_gran = 1; @@ -131,6 +132,7 @@ const void *kernfs_super_ns(struct super_block *sb) * @fs_type: file_system_type of the fs being mounted * @flags: mount flags specified for the mount * @root: kernfs_root of the hierarchy being mounted + * @magic: file system specific magic number * @new_sb_created: tell the caller if we allocated a new superblock * @ns: optional namespace tag of the mount * @@ -142,8 +144,8 @@ const void *kernfs_super_ns(struct super_block *sb) * The return value can be passed to the vfs layer verbatim. */ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, - struct kernfs_root *root, bool *new_sb_created, - const void *ns) + struct kernfs_root *root, unsigned long magic, + bool *new_sb_created, const void *ns) { struct super_block *sb; struct kernfs_super_info *info; @@ -166,12 +168,18 @@ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, *new_sb_created = !sb->s_root; if (!sb->s_root) { - error = kernfs_fill_super(sb); + struct kernfs_super_info *info = kernfs_info(sb); + + error = kernfs_fill_super(sb, magic); if (error) { deactivate_locked_super(sb); return ERR_PTR(error); } sb->s_flags |= MS_ACTIVE; + + mutex_lock(&kernfs_mutex); + list_add(&info->node, &root->supers); + mutex_unlock(&kernfs_mutex); } return dget(sb->s_root); @@ -190,6 +198,10 @@ void kernfs_kill_sb(struct super_block *sb) struct kernfs_super_info *info = kernfs_info(sb); struct kernfs_node *root_kn = sb->s_root->d_fsdata; + mutex_lock(&kernfs_mutex); + list_del(&info->node); + mutex_unlock(&kernfs_mutex); + /* * Remove the superblock from fs_supers/s_instances * so we can't find it, before freeing kernfs_super_info. |