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| author |   David Howells <dhowells@redhat.com> | 2018-11-04 03:19:03 -0500 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2019-01-30 17:44:23 -0500 |
| commit | 9bc61ab18b1d41f26dc06b9e6d3c203e65f83fe6 (patch) | |
| tree | 4aa7a18d6f2de4f147b5515d99e9fcae897c49a0 /fs/internal.h | |
| parent | saner handling of temporary namespaces (diff) | |
| download | linux-dev-9bc61ab18b1d41f26dc06b9e6d3c203e65f83fe6.tar.xz linux-dev-9bc61ab18b1d41f26dc06b9e6d3c203e65f83fe6.zip | |
vfs: Introduce fs_context, switch vfs_kern_mount() to it.
Introduce a filesystem context concept to be used during superblock
creation for mount and superblock reconfiguration for remount. This is
allocated at the beginning of the mount procedure and into it is placed:
(1) Filesystem type.
(2) Namespaces.
(3) Source/Device names (there may be multiple).
(4) Superblock flags (SB_*).
(5) Security details.
(6) Filesystem-specific data, as set by the mount options.
Accessor functions are then provided to set up a context, parameterise it
from monolithic mount data (the data page passed to mount(2)) and tear it
down again.
A legacy wrapper is provided that implements what will be the basic
operations, wrapping access to filesystems that aren't yet aware of the
fs_context.
Finally, vfs_kern_mount() is changed to make use of the fs_context and
mount_fs() is replaced by vfs_get_tree(), called from vfs_kern_mount().
[AV -- add missing kstrdup()]
[AV -- put_cred() can be unconditional - fc->cred can't be NULL]
[AV -- take legacy_validate() contents into legacy_parse_monolithic()]
[AV -- merge KERNEL_MOUNT and USER_MOUNT]
[AV -- don't unlock superblock on success return from vfs_get_tree()]
[AV -- kill 'reference' argument of init_fs_context()]
Signed-off-by: David Howells <dhowells@redhat.com>
Co-developed-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/internal.h')
| -rw-r--r-- | fs/internal.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/internal.h b/fs/internal.h index d410186bc369..f85c3212d25d 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -17,6 +17,7 @@ struct linux_binprm; struct path; struct mount; struct shrink_control; +struct fs_context; /* * block_dev.c @@ -52,6 +53,12 @@ int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied, extern void __init chrdev_init(void); /* + * fs_context.c + */ +extern int legacy_get_tree(struct fs_context *fc); +extern int parse_monolithic_mount_data(struct fs_context *, void *); + +/* * namei.c */ extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *); @@ -101,8 +108,6 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *); */ extern int do_remount_sb(struct super_block *, int, void *, int); extern bool trylock_super(struct super_block *sb); -extern struct dentry *mount_fs(struct file_system_type *, - int, const char *, void *); extern struct super_block *user_get_super(dev_t); /* |