diff options
| -rw-r--r-- | fs/fs_context.c | 10 | ||||
| -rw-r--r-- | include/linux/fs_context.h | 3 |
2 files changed, 13 insertions, 0 deletions
diff --git a/fs/fs_context.c b/fs/fs_context.c index 5e2c3aba1dd8..2bd652b6e848 100644 --- a/fs/fs_context.c +++ b/fs/fs_context.c @@ -69,6 +69,9 @@ static struct fs_context *alloc_fs_context(struct file_system_type *fs_type, case FS_CONTEXT_FOR_MOUNT: fc->user_ns = get_user_ns(fc->cred->user_ns); break; + case FS_CONTEXT_FOR_SUBMOUNT: + fc->user_ns = get_user_ns(reference->d_sb->s_user_ns); + break; case FS_CONTEXT_FOR_RECONFIGURE: /* We don't pin any namespaces as the superblock's * subscriptions cannot be changed at this point. @@ -106,6 +109,13 @@ struct fs_context *fs_context_for_reconfigure(struct dentry *dentry, } EXPORT_SYMBOL(fs_context_for_reconfigure); +struct fs_context *fs_context_for_submount(struct file_system_type *type, + struct dentry *reference) +{ + return alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT); +} +EXPORT_SYMBOL(fs_context_for_submount); + void fc_drop_locked(struct fs_context *fc) { struct super_block *sb = fc->root->d_sb; diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h index 98772f882a3e..7feb018c7a9e 100644 --- a/include/linux/fs_context.h +++ b/include/linux/fs_context.h @@ -25,6 +25,7 @@ struct user_namespace; enum fs_context_purpose { FS_CONTEXT_FOR_MOUNT, /* New superblock for explicit mount */ + FS_CONTEXT_FOR_SUBMOUNT, /* New superblock for automatic submount */ FS_CONTEXT_FOR_RECONFIGURE, /* Superblock reconfiguration (remount) */ }; @@ -61,6 +62,8 @@ extern struct fs_context *fs_context_for_mount(struct file_system_type *fs_type, extern struct fs_context *fs_context_for_reconfigure(struct dentry *dentry, unsigned int sb_flags, unsigned int sb_flags_mask); +extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_type, + struct dentry *reference); extern int vfs_get_tree(struct fs_context *fc); extern void put_fs_context(struct fs_context *fc); |