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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2024 Paulo Alcantara <pc@manguebit.com>
*/
#ifndef _CIFS_REPARSE_H
#define _CIFS_REPARSE_H
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/uidgid.h>
#include "fs_context.h"
#include "cifsglob.h"
/*
* Used only by cifs.ko to ignore reparse points from files when client or
* server doesn't support FSCTL_GET_REPARSE_POINT.
*/
#define IO_REPARSE_TAG_INTERNAL ((__u32)~0U)
static inline dev_t reparse_nfs_mkdev(struct reparse_posix_data *buf)
{
u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer);
return MKDEV(v >> 32, v & 0xffffffff);
}
static inline dev_t wsl_mkdev(void *ptr)
{
u64 v = le64_to_cpu(*(__le64 *)ptr);
return MKDEV(v & 0xffffffff, v >> 32);
}
static inline kuid_t wsl_make_kuid(struct cifs_sb_info *cifs_sb,
void *ptr)
{
u32 uid = le32_to_cpu(*(__le32 *)ptr);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
return cifs_sb->ctx->linux_uid;
return make_kuid(current_user_ns(), uid);
}
static inline kgid_t wsl_make_kgid(struct cifs_sb_info *cifs_sb,
void *ptr)
{
u32 gid = le32_to_cpu(*(__le32 *)ptr);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
return cifs_sb->ctx->linux_gid;
return make_kgid(current_user_ns(), gid);
}
static inline u64 reparse_mode_nfs_type(mode_t mode)
{
switch (mode & S_IFMT) {
case S_IFBLK: return NFS_SPECFILE_BLK;
case S_IFCHR: return NFS_SPECFILE_CHR;
case S_IFIFO: return NFS_SPECFILE_FIFO;
case S_IFSOCK: return NFS_SPECFILE_SOCK;
}
return 0;
}
static inline u32 reparse_mode_wsl_tag(mode_t mode)
{
switch (mode & S_IFMT) {
case S_IFBLK: return IO_REPARSE_TAG_LX_BLK;
case S_IFCHR: return IO_REPARSE_TAG_LX_CHR;
case S_IFIFO: return IO_REPARSE_TAG_LX_FIFO;
case S_IFSOCK: return IO_REPARSE_TAG_AF_UNIX;
}
return 0;
}
/*
* Match a reparse point inode if reparse tag and ctime haven't changed.
*
* Windows Server updates ctime of reparse points when their data have changed.
* The server doesn't allow changing reparse tags from existing reparse points,
* though it's worth checking.
*/
static inline bool reparse_inode_match(struct inode *inode,
struct cifs_fattr *fattr)
{
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct timespec64 ctime = inode_get_ctime(inode);
/*
* Do not match reparse tags when client or server doesn't support
* FSCTL_GET_REPARSE_POINT. @fattr->cf_cifstag should contain correct
* reparse tag from query dir response but the client won't be able to
* read the reparse point data anyway. This spares us a revalidation.
*/
if (cinode->reparse_tag != IO_REPARSE_TAG_INTERNAL &&
cinode->reparse_tag != fattr->cf_cifstag)
return false;
return (cinode->cifsAttrs & ATTR_REPARSE) &&
timespec64_equal(&ctime, &fattr->cf_ctime);
}
static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data)
{
struct smb2_file_all_info *fi = &data->fi;
u32 attrs = le32_to_cpu(fi->Attributes);
bool ret;
ret = data->reparse_point || (attrs & ATTR_REPARSE);
if (ret)
attrs |= ATTR_REPARSE;
fi->Attributes = cpu_to_le32(attrs);
return ret;
}
bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
struct cifs_fattr *fattr,
struct cifs_open_info_data *data);
int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, const char *symname);
int smb2_mknod_reparse(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, umode_t mode, dev_t dev);
int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, struct kvec *rsp_iov,
struct cifs_open_info_data *data);
#endif /* _CIFS_REPARSE_H */
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