mirror of
https://github.com/torvalds/linux
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b74d24f7a7
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* VirtualBox Guest Shared Folders support: module header.
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*
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* Copyright (C) 2006-2018 Oracle Corporation
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*/
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#ifndef VFSMOD_H
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#define VFSMOD_H
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#include <linux/backing-dev.h>
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#include <linux/idr.h>
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#include "shfl_hostintf.h"
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#define DIR_BUFFER_SIZE SZ_16K
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/* The cast is to prevent assignment of void * to pointers of arbitrary type */
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#define VBOXSF_SBI(sb) ((struct vboxsf_sbi *)(sb)->s_fs_info)
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#define VBOXSF_I(i) container_of(i, struct vboxsf_inode, vfs_inode)
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struct vboxsf_handle;
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struct vboxsf_options {
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unsigned long ttl;
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kuid_t uid;
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kgid_t gid;
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bool dmode_set;
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bool fmode_set;
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umode_t dmode;
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umode_t fmode;
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umode_t dmask;
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umode_t fmask;
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};
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struct vboxsf_fs_context {
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struct vboxsf_options o;
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char *nls_name;
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};
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/* per-shared folder information */
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struct vboxsf_sbi {
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struct vboxsf_options o;
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struct shfl_fsobjinfo root_info;
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struct idr ino_idr;
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spinlock_t ino_idr_lock; /* This protects ino_idr */
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struct nls_table *nls;
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u32 next_generation;
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u32 root;
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int bdi_id;
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};
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/* per-inode information */
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struct vboxsf_inode {
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/* some information was changed, update data on next revalidate */
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int force_restat;
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/* list of open handles for this inode + lock protecting it */
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struct list_head handle_list;
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/* This mutex protects handle_list accesses */
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struct mutex handle_list_mutex;
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/* The VFS inode struct */
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struct inode vfs_inode;
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};
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struct vboxsf_dir_info {
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struct list_head info_list;
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};
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struct vboxsf_dir_buf {
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size_t entries;
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size_t free;
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size_t used;
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void *buf;
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struct list_head head;
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};
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/* globals */
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extern const struct inode_operations vboxsf_dir_iops;
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extern const struct inode_operations vboxsf_lnk_iops;
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extern const struct inode_operations vboxsf_reg_iops;
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extern const struct file_operations vboxsf_dir_fops;
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extern const struct file_operations vboxsf_reg_fops;
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extern const struct address_space_operations vboxsf_reg_aops;
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extern const struct dentry_operations vboxsf_dentry_ops;
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/* from file.c */
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struct vboxsf_handle *vboxsf_create_sf_handle(struct inode *inode,
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u64 handle, u32 access_flags);
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void vboxsf_release_sf_handle(struct inode *inode, struct vboxsf_handle *sf_handle);
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/* from utils.c */
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struct inode *vboxsf_new_inode(struct super_block *sb);
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int vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
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const struct shfl_fsobjinfo *info, bool reinit);
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int vboxsf_create_at_dentry(struct dentry *dentry,
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struct shfl_createparms *params);
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int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
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struct shfl_fsobjinfo *info);
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int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
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int vboxsf_inode_revalidate(struct dentry *dentry);
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int vboxsf_getattr(struct mnt_idmap *idmap, const struct path *path,
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struct kstat *kstat, u32 request_mask,
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unsigned int query_flags);
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int vboxsf_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *iattr);
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struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
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struct dentry *dentry);
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int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
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const unsigned char *utf8_name, size_t utf8_len);
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struct vboxsf_dir_info *vboxsf_dir_info_alloc(void);
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void vboxsf_dir_info_free(struct vboxsf_dir_info *p);
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int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
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u64 handle);
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/* from vboxsf_wrappers.c */
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int vboxsf_connect(void);
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void vboxsf_disconnect(void);
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int vboxsf_create(u32 root, struct shfl_string *parsed_path,
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struct shfl_createparms *create_parms);
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int vboxsf_close(u32 root, u64 handle);
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int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
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int vboxsf_rename(u32 root, struct shfl_string *src_path,
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struct shfl_string *dest_path, u32 flags);
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int vboxsf_read(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
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int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
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int vboxsf_dirinfo(u32 root, u64 handle,
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struct shfl_string *parsed_path, u32 flags, u32 index,
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u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
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int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
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u32 *buf_len, void *buf);
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int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
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int vboxsf_unmap_folder(u32 root);
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int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
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u32 buf_len, u8 *buf);
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int vboxsf_symlink(u32 root, struct shfl_string *new_path,
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struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
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int vboxsf_set_utf8(void);
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int vboxsf_set_symlinks(void);
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#endif
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