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5a4b09ecf8
Add support for creating special files via WSL reparse points when using 'reparse=wsl' mount option. They're faster than NFS reparse points because they don't require extra roundtrips to figure out what ->d_type a specific dirent is as such information is already stored in query dir responses and then making getdents() calls faster. Signed-off-by: Paulo Alcantara <pc@manguebit.com> Signed-off-by: Steve French <stfrench@microsoft.com>
85 lines
2.4 KiB
C
85 lines
2.4 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 "cifsglob.h"
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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 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 timespec64 ctime = inode_get_ctime(inode);
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return (CIFS_I(inode)->cifsAttrs & ATTR_REPARSE) &&
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CIFS_I(inode)->reparse_tag == fattr->cf_cifstag &&
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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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