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4b96024ef2
As per MS-FSA 2.1.5.10.14, support for FSCTL_GET_REPARSE_POINT is
optional and if the server doesn't support it,
STATUS_INVALID_DEVICE_REQUEST must be returned for the operation.
If we find files with reparse points and we can't read them due to
lack of client or server support, just ignore it and then treat them
as regular files or junctions.
Fixes: 5f71ebc412 ("smb: client: parse reparse point flag in create response")
Reported-by: Sebastian Steinbeisser <Sebastian.Steinbeisser@lrz.de>
Tested-by: Sebastian Steinbeisser <Sebastian.Steinbeisser@lrz.de>
Acked-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2024 Paulo Alcantara <pc@manguebit.com>
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*/
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#ifndef _CIFS_REPARSE_H
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#define _CIFS_REPARSE_H
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/uidgid.h>
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#include "fs_context.h"
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#include "cifsglob.h"
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/*
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* Used only by cifs.ko to ignore reparse points from files when client or
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* server doesn't support FSCTL_GET_REPARSE_POINT.
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*/
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#define IO_REPARSE_TAG_INTERNAL ((__u32)~0U)
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static inline dev_t reparse_nfs_mkdev(struct reparse_posix_data *buf)
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{
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u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer);
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return MKDEV(v >> 32, v & 0xffffffff);
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}
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static inline dev_t wsl_mkdev(void *ptr)
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{
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u64 v = le64_to_cpu(*(__le64 *)ptr);
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return MKDEV(v & 0xffffffff, v >> 32);
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}
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static inline kuid_t wsl_make_kuid(struct cifs_sb_info *cifs_sb,
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void *ptr)
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{
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u32 uid = le32_to_cpu(*(__le32 *)ptr);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
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return cifs_sb->ctx->linux_uid;
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return make_kuid(current_user_ns(), uid);
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}
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static inline kgid_t wsl_make_kgid(struct cifs_sb_info *cifs_sb,
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void *ptr)
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{
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u32 gid = le32_to_cpu(*(__le32 *)ptr);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
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return cifs_sb->ctx->linux_gid;
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return make_kgid(current_user_ns(), gid);
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}
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static inline u64 reparse_mode_nfs_type(mode_t mode)
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{
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switch (mode & S_IFMT) {
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case S_IFBLK: return NFS_SPECFILE_BLK;
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case S_IFCHR: return NFS_SPECFILE_CHR;
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case S_IFIFO: return NFS_SPECFILE_FIFO;
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case S_IFSOCK: return NFS_SPECFILE_SOCK;
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}
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return 0;
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}
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static inline u32 reparse_mode_wsl_tag(mode_t mode)
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{
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switch (mode & S_IFMT) {
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case S_IFBLK: return IO_REPARSE_TAG_LX_BLK;
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case S_IFCHR: return IO_REPARSE_TAG_LX_CHR;
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case S_IFIFO: return IO_REPARSE_TAG_LX_FIFO;
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case S_IFSOCK: return IO_REPARSE_TAG_AF_UNIX;
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}
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return 0;
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}
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/*
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* Match a reparse point inode if reparse tag and ctime haven't changed.
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*
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* Windows Server updates ctime of reparse points when their data have changed.
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* The server doesn't allow changing reparse tags from existing reparse points,
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* though it's worth checking.
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*/
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static inline bool reparse_inode_match(struct inode *inode,
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struct cifs_fattr *fattr)
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{
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struct cifsInodeInfo *cinode = CIFS_I(inode);
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struct timespec64 ctime = inode_get_ctime(inode);
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/*
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* Do not match reparse tags when client or server doesn't support
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* FSCTL_GET_REPARSE_POINT. @fattr->cf_cifstag should contain correct
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* reparse tag from query dir response but the client won't be able to
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* read the reparse point data anyway. This spares us a revalidation.
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*/
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if (cinode->reparse_tag != IO_REPARSE_TAG_INTERNAL &&
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cinode->reparse_tag != fattr->cf_cifstag)
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return false;
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return (cinode->cifsAttrs & ATTR_REPARSE) &&
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timespec64_equal(&ctime, &fattr->cf_ctime);
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}
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static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data)
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{
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struct smb2_file_all_info *fi = &data->fi;
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u32 attrs = le32_to_cpu(fi->Attributes);
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bool ret;
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ret = data->reparse_point || (attrs & ATTR_REPARSE);
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if (ret)
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attrs |= ATTR_REPARSE;
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fi->Attributes = cpu_to_le32(attrs);
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return ret;
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}
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bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
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struct cifs_fattr *fattr,
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struct cifs_open_info_data *data);
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int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode,
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struct dentry *dentry, struct cifs_tcon *tcon,
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const char *full_path, const char *symname);
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int smb2_mknod_reparse(unsigned int xid, struct inode *inode,
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struct dentry *dentry, struct cifs_tcon *tcon,
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const char *full_path, umode_t mode, dev_t dev);
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int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, struct kvec *rsp_iov,
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struct cifs_open_info_data *data);
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#endif /* _CIFS_REPARSE_H */
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