diff options
| author | David Howells <dhowells@redhat.com> | 2018-11-01 23:07:25 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-02-28 03:29:26 -0500 |
| commit | 3e1aeb00e6d132efc151dacc062b38269bc9eccc (patch) | |
| tree | d6cb75c4e0540cdd94e381c2afcacd6d7142fb30 /fs/filesystems.c | |
| parent | 846e56621897a63966b7f03a70be29060394c363 (diff) | |
vfs: Implement a filesystem superblock creation/configuration context
[AV - unfuck kern_mount_data(); we want non-NULL ->mnt_ns on long-living
mounts]
[AV - reordering fs/namespace.c is badly overdue, but let's keep it
separate from that series]
[AV - drop simple_pin_fs() change]
[AV - clean vfs_kern_mount() failure exits up]
Implement a filesystem context concept to be used during superblock
creation for mount and superblock reconfiguration for remount.
The mounting procedure then becomes:
(1) Allocate new fs_context context.
(2) Configure the context.
(3) Create superblock.
(4) Query the superblock.
(5) Create a mount for the superblock.
(6) Destroy the context.
Rather than calling fs_type->mount(), an fs_context struct is created and
fs_type->init_fs_context() is called to set it up. Pointers exist for the
filesystem and LSM to hang their private data off.
A set of operations has to be set by ->init_fs_context() to provide
freeing, duplication, option parsing, binary data parsing, validation,
mounting and superblock filling.
Legacy filesystems are supported by the provision of a set of legacy
fs_context operations that build up a list of mount options and then invoke
fs_type->mount() from within the fs_context ->get_tree() operation. This
allows all filesystems to be accessed using fs_context.
It should be noted that, whilst this patch adds a lot of lines of code,
there is quite a bit of duplication with existing code that can be
eliminated should all filesystems be converted over.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/filesystems.c')
| -rw-r--r-- | fs/filesystems.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/filesystems.c b/fs/filesystems.c index b03f57b1105b..9135646e41ac 100644 --- a/fs/filesystems.c +++ b/fs/filesystems.c @@ -16,6 +16,7 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/fs_parser.h> /* * Handling of filesystem drivers list. @@ -73,6 +74,9 @@ int register_filesystem(struct file_system_type * fs) int res = 0; struct file_system_type ** p; + if (fs->parameters && !fs_validate_description(fs->parameters)) + return -EINVAL; + BUG_ON(strchr(fs->name, '.')); if (fs->next) return -EBUSY; |