From c520ba7573a84bd37f8803a3beeb8f6f995bf9e1 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Tue, 5 Mar 2024 23:28:48 -0600 Subject: smb: client: move most of reparse point handling code to common file In preparation to add support for creating special files also via WSL reparse points in next commits. Signed-off-by: Paulo Alcantara Signed-off-by: Steve French --- fs/smb/client/reparse.h | 73 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 fs/smb/client/reparse.h (limited to 'fs/smb/client/reparse.h') diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h new file mode 100644 index 000000000000..3ceb90da0df9 --- /dev/null +++ b/fs/smb/client/reparse.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2024 Paulo Alcantara + */ + +#ifndef _CIFS_REPARSE_H +#define _CIFS_REPARSE_H + +#include +#include +#include "cifsglob.h" + +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 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; +} + +/* + * 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 timespec64 ctime = inode_get_ctime(inode); + + return (CIFS_I(inode)->cifsAttrs & ATTR_REPARSE) && + CIFS_I(inode)->reparse_tag == fattr->cf_cifstag && + 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_make_nfs_node(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 */ -- cgit v1.2.3