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RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Wi
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From: |
Shi, Guohuai |
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Subject: |
RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows |
|
Date: |
Wed, 4 May 2022 19:34:22 +0000 |
> -----Original Message-----
> From: Christian Schoenebeck <qemu_oss@crudebyte.com>
> Sent: Thursday, May 5, 2022 02:02
> To: qemu-devel@nongnu.org
> Cc: Greg Kurz <groug@kaod.org>; Meng, Bin <Bin.Meng@windriver.com>; Shi,
> Guohuai <Guohuai.Shi@windriver.com>; Bin Meng <bmeng.cn@gmail.com>
> Subject: Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver
> for Windows
>
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On Montag, 25. April 2022 16:27:01 CEST Bin Meng wrote:
> > From: Guohuai Shi <guohuai.shi@windriver.com>
> >
> > Add a 9p local file system backend driver to support Windows,
> > including open, read, write, close, rename, remove, etc.
> >
> > All security models are supported. The mapped (mapped-xattr)
> > security model is implemented using NTFS Alternate Data Stream
> > (ADS) so the 9p export path shall be on an NTFS partition.
> >
> > Signed-off-by: Guohuai Shi <guohuai.shi@windriver.com>
> > Signed-off-by: Bin Meng <bin.meng@windriver.com>
> > ---
> >
> > hw/9pfs/9p-linux-errno.h | 151 +++++
> > hw/9pfs/9p-local.h | 4 +
> > hw/9pfs/9p-util.h | 41 ++
> > hw/9pfs/9p.h | 23 +
> > hw/9pfs/9p-local-win32.c | 1242 ++++++++++++++++++++++++++++++++++++++
> > hw/9pfs/9p-util-win32.c | 303 ++++++++++
> > hw/9pfs/9p-xattr.c | 113 ++++
> > hw/9pfs/9p.c | 91 ++-
> > hw/9pfs/codir.c | 15 +
> > 9 files changed, 1982 insertions(+), 1 deletion(-)
> > create mode 100644 hw/9pfs/9p-linux-errno.h
> > create mode 100644 hw/9pfs/9p-local-win32.c
> > create mode 100644 hw/9pfs/9p-util-win32.c
>
> This patch is definitely too huge and should be split up into a huge bunch of
> separate patches!
>
> > diff --git a/hw/9pfs/9p-linux-errno.h b/hw/9pfs/9p-linux-errno.h
> > new file mode 100644
> > index 0000000000..b0d6ac45ac
> > --- /dev/null
> > +++ b/hw/9pfs/9p-linux-errno.h
>
> This file definitely deserves a patch on its own.
>
> As for its filename: Following our current filename scheme, it would probably
> be better be named 9p-errno-linux.h or 9p-errno-dotl.h as this is probably a
> 9p protocol version thing.
>
> > @@ -0,0 +1,151 @@
> > +/*
> > + * 9p Linux errno translation definition
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later. + * See the COPYING file in the top-level directory.
> > + */
> > +
> > +#include <errno.h>
> > +
> > +#ifndef QEMU_9P_LINUX_ERRNO_H
> > +#define QEMU_9P_LINUX_ERRNO_H
> > +
> > +/*
> > + * This file contains the Linux errno definitions to translate errnos set
> > by + * the 9P server (running on Windows) to a corresponding errno value. +
> > *
> > + * This list should be periodically reviewed and updated; particularly for
> > + * errnos that might be set as a result of a file system operation.
> > + */
> > +
>
> I would just import the already existing sys/errno.h from the Linux kernel,
> with all its copyright header etc. and then with a 2nd patch just prefix the
> individual macros with DOTL_*
>
> > +#define L_EPERM 1 /* Operation not permitted */
> > +#define L_ENOENT 2 /* No such file or directory */
> > +#define L_ESRCH 3 /* No such process */
> > +#define L_EINTR 4 /* Interrupted system call */
> > +#define L_EIO 5 /* I/O error */
> > +#define L_ENXIO 6 /* No such device or address */
> > +#define L_E2BIG 7 /* Argument list too long */
> > +#define L_ENOEXEC 8 /* Exec format error */
> > +#define L_EBADF 9 /* Bad file number */
> > +#define L_ECHILD 10 /* No child processes */
> > +#define L_EAGAIN 11 /* Try again */
> > +#define L_ENOMEM 12 /* Out of memory */
> > +#define L_EACCES 13 /* Permission denied */
> > +#define L_EFAULT 14 /* Bad address */
> > +#define L_ENOTBLK 15 /* Block device required */
> > +#define L_EBUSY 16 /* Device or resource busy */
> > +#define L_EEXIST 17 /* File exists */
> > +#define L_EXDEV 18 /* Cross-device link */
> > +#define L_ENODEV 19 /* No such device */
> > +#define L_ENOTDIR 20 /* Not a directory */
> > +#define L_EISDIR 21 /* Is a directory */
> > +#define L_EINVAL 22 /* Invalid argument */
> > +#define L_ENFILE 23 /* File table overflow */
> > +#define L_EMFILE 24 /* Too many open files */
> > +#define L_ENOTTY 25 /* Not a typewriter */
> > +#define L_ETXTBSY 26 /* Text file busy */
> > +#define L_EFBIG 27 /* File too large */
> > +#define L_ENOSPC 28 /* No space left on device */
> > +#define L_ESPIPE 29 /* Illegal seek */
> > +#define L_EROFS 30 /* Read-only file system */
> > +#define L_EMLINK 31 /* Too many links */
> > +#define L_EPIPE 32 /* Broken pipe */
> > +#define L_EDOM 33 /* Math argument out of domain of func */
> > +#define L_ERANGE 34 /* Math result not representable */
> > +#define L_EDEADLK 35 /* Resource deadlock would occur */
> > +#define L_ENAMETOOLONG 36 /* File name too long */
> > +#define L_ENOLCK 37 /* No record locks available */
> > +#define L_ENOSYS 38 /* Function not implemented */
> > +#define L_ENOTEMPTY 39 /* Directory not empty */
> > +#define L_ELOOP 40 /* Too many symbolic links encountered */
> > +#define L_ENOMSG 42 /* No message of desired type */
> > +#define L_EIDRM 43 /* Identifier removed */
> > +#define L_ECHRNG 44 /* Channel number out of range */
> > +#define L_EL2NSYNC 45 /* Level 2 not synchronized */
> > +#define L_EL3HLT 46 /* Level 3 halted */
> > +#define L_EL3RST 47 /* Level 3 reset */
> > +#define L_ELNRNG 48 /* Link number out of range */
> > +#define L_EUNATCH 49 /* Protocol driver not attached */
> > +#define L_ENOCSI 50 /* No CSI structure available */
> > +#define L_EL2HLT 51 /* Level 2 halted */
> > +#define L_EBADE 52 /* Invalid exchange */
> > +#define L_EBADR 53 /* Invalid request descriptor */
> > +#define L_EXFULL 54 /* Exchange full */
> > +#define L_ENOANO 55 /* No anode */
> > +#define L_EBADRQC 56 /* Invalid request code */
> > +#define L_EBADSLT 57 /* Invalid slot */
> > +#define L_EBFONT 58 /* Bad font file format */
> > +#define L_ENOSTR 59 /* Device not a stream */
> > +#define L_ENODATA 61 /* No data available */
> > +#define L_ETIME 62 /* Timer expired */
> > +#define L_ENOSR 63 /* Out of streams resources */
> > +#define L_ENONET 64 /* Machine is not on the network */
> > +#define L_ENOPKG 65 /* Package not installed */
> > +#define L_EREMOTE 66 /* Object is remote */
> > +#define L_ENOLINK 67 /* Link has been severed */
> > +#define L_EADV 68 /* Advertise error */
> > +#define L_ESRMNT 69 /* Srmount error */
> > +#define L_ECOMM 70 /* Communication error on send */
> > +#define L_EPROTO 71 /* Protocol error */
> > +#define L_EMULTIHOP 72 /* Multihop attempted */
> > +#define L_EDOTDOT 73 /* RFS specific error */
> > +#define L_EBADMSG 74 /* Not a data message */
> > +#define L_EOVERFLOW 75 /* Value too large for defined data type
> */
> > +#define L_ENOTUNIQ 76 /* Name not unique on network */
> > +#define L_EBADFD 77 /* File descriptor in bad state */
> > +#define L_EREMCHG 78 /* Remote address changed */
> > +#define L_ELIBACC 79 /* Can not access a needed shared library
> > */ +#define L_ELIBBAD 80 /* Accessing a corrupted shared library
> > */ +#define L_ELIBSCN 81 /* .lib section in a.out corrupted */
> > +#define L_ELIBMAX 82 /* Attempting to link in too many shared
> > libs */ +#define L_ELIBEXEC 83 /* Cannot exec a shared library
> > directly */ +#define L_EILSEQ 84 /* Illegal byte sequence */
> > +#define L_ERESTART 85 /* Interrupted system call should be
> > restarted */ +#define L_ESTRPIPE 86 /* Streams pipe error */
> > +#define L_EUSERS 87 /* Too many users */
> > +#define L_ENOTSOCK 88 /* Socket operation on non-socket */
> > +#define L_EDESTADDRREQ 89 /* Destination address required */
> > +#define L_EMSGSIZE 90 /* Message too long */
> > +#define L_EPROTOTYPE 91 /* Protocol wrong type for socket */
> > +#define L_ENOPROTOOPT 92 /* Protocol not available */
> > +#define L_EPROTONOSUPPORT 93 /* Protocol not supported */
> > +#define L_ESOCKTNOSUPPORT 94 /* Socket type not supported */
> > +#define L_EOPNOTSUPP 95 /* Operation not supported on transport
> > endpoint */ +#define L_EPFNOSUPPORT 96 /* Protocol family not
> > supported */ +#define L_EAFNOSUPPORT 97 /* Address family not
> > supported by protocol */ +#define L_EADDRINUSE 98 /* Address
> > already in use */
> > +#define L_EADDRNOTAVAIL 99 /* Cannot assign requested address */
> > +#define L_ENETDOWN 100 /* Network is down */
> > +#define L_ENETUNREACH 101 /* Network is unreachable */
> > +#define L_ENETRESET 102 /* Network dropped connection because of
> > reset */ +#define L_ECONNABORTED 103 /* Software caused connection
> > abort */ +#define L_ECONNRESET 104 /* Connection reset by peer */
> > +#define L_ENOBUFS 105 /* No buffer space available */
> > +#define L_EISCONN 106 /* Transport endpoint is already connected
> > */ +#define L_ENOTCONN 107 /* Transport endpoint is not connected
> > */ +#define L_ESHUTDOWN 108 /* Cannot send after transport endpoint
> > shutdown */ +#define L_ETOOMANYREFS 109 /* Too many references: cannot
> > splice */ +#define L_ETIMEDOUT 110 /* Connection timed out */
> > +#define L_ECONNREFUSED 111 /* Connection refused */
> > +#define L_EHOSTDOWN 112 /* Host is down */
> > +#define L_EHOSTUNREACH 113 /* No route to host */
> > +#define L_EALREADY 114 /* Operation already in progress */
> > +#define L_EINPROGRESS 115 /* Operation now in progress */
> > +#define L_ESTALE 116 /* Stale NFS file handle */
> > +#define L_EUCLEAN 117 /* Structure needs cleaning */
> > +#define L_ENOTNAM 118 /* Not a XENIX named type file */
> > +#define L_ENAVAIL 119 /* No XENIX semaphores available */
> > +#define L_EISNAM 120 /* Is a named type file */
> > +#define L_EREMOTEIO 121 /* Remote I/O error */
> > +#define L_EDQUOT 122 /* Quota exceeded */
> > +#define L_ENOMEDIUM 123 /* No medium found */
> > +#define L_EMEDIUMTYPE 124 /* Wrong medium type */
> > +#define L_ECANCELED 125 /* Operation Canceled */
> > +#define L_ENOKEY 126 /* Required key not available */
> > +#define L_EKEYEXPIRED 127 /* Key has expired */
> > +#define L_EKEYREVOKED 128 /* Key has been revoked */
> > +#define L_EKEYREJECTED 129 /* Key was rejected by service */
> > +#define L_EOWNERDEAD 130 /* Owner died */
> > +#define L_ENOTRECOVERABLE 131 /* State not recoverable */
> > +
> > +#endif /* QEMU_9P_LINUX_ERRNO_H */
> > diff --git a/hw/9pfs/9p-local.h b/hw/9pfs/9p-local.h
> > index 55ea4b7883..4c75876e19 100644
> > --- a/hw/9pfs/9p-local.h
> > +++ b/hw/9pfs/9p-local.h
> > @@ -31,6 +31,10 @@ static inline bool
> > local_is_mapped_file_metadata(FsContext *fs_ctx,
> >
> > int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags,
> > mode_t mode);
> > +#ifndef CONFIG_WIN32
> > int local_opendir_nofollow(FsContext *fs_ctx, const char *path);
> > +#else
> > +DIR *local_opendir_nofollow(FsContext *fs_ctx, const char *path);
> > +#endif
> >
> > #endif
>
> Same goes for all the rest ... this should all be split up into individual
> patches, some of the changes of a file probably with separate patches as well.
> As this looks now, it's simply not clear what all these hunks of this huge
> patch are needed for.
>
> Stopping here for now.
>
> > diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
> > index 97e681e167..6eadb38e1d 100644
> > --- a/hw/9pfs/9p-util.h
> > +++ b/hw/9pfs/9p-util.h
> > @@ -43,6 +43,7 @@ static inline void close_preserve_errno(int fd)
> > errno = serrno;
> > }
> >
> > +#ifndef CONFIG_WIN32
> > static inline int openat_dir(int dirfd, const char *name)
> > {
> > return openat(dirfd, name,
> > @@ -89,7 +90,9 @@ again:
> > errno = serrno;
> > return fd;
> > }
> > +#endif /* !CONFIG_WIN32 */
> >
> > +#ifndef CONFIG_WIN32
> > ssize_t fgetxattrat_nofollow(int dirfd, const char *path, const char *name,
> > void *value, size_t size);
> > int fsetxattrat_nofollow(int dirfd, const char *path, const char *name,
> > @@ -98,7 +101,38 @@ ssize_t flistxattrat_nofollow(int dirfd, const char
> > *filename, char *list, size_t size);
> > ssize_t fremovexattrat_nofollow(int dirfd, const char *filename,
> > const char *name);
> > +#else
> > +
> > +ssize_t fgetxattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name, void *value, size_t size);
> > +int fsetxattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name, void *value, size_t size,
> > + int flags);
> > +ssize_t flistxattrat_nofollow(const char *dirname, const char *filename,
> > + char *list, size_t size);
> > +ssize_t fremovexattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name);
> > +
> > +int qemu_statfs(const char *fs_root, struct statfs *stbuf);
> > +
> > +static inline char *merge_fs_path(const char *path1, const char *path2)
> > +{
> > + char *full_fs_path;
> > + size_t full_fs_path_len;
> > +
> > + full_fs_path_len = strlen(path1) + strlen(path2) + 2;
> > + full_fs_path = g_malloc(full_fs_path_len);
> >
> > + strcpy(full_fs_path, path1);
> > + strcat(full_fs_path, "\\");
> > + strcat(full_fs_path, path2);
> > +
> > + return full_fs_path;
> > +}
> > +
> > +#endif /* !CONFIG_WIN32 */
> > +
> > +#ifndef CONFIG_WIN32
> > /*
> > * Darwin has d_seekoff, which appears to function similarly to d_off.
> > * However, it does not appear to be supported on all file systems,
> > @@ -113,6 +147,7 @@ static inline off_t qemu_dirent_off(struct dirent *dent)
> > return dent->d_off;
> > #endif
> > }
> > +#endif /* !CONFIG_WIN32 */
> >
> > /**
> > * qemu_dirent_dup() - Duplicate directory entry @dent.
> > @@ -154,6 +189,12 @@ static inline struct dirent *qemu_dirent_dup(struct
> > dirent *dent) #if defined CONFIG_DARWIN && defined CONFIG_PTHREAD_FCHDIR_NP
> > int pthread_fchdir_np(int fd) __attribute__((weak_import));
> > #endif
> > +
> > +#ifndef CONFIG_WIN32
> > int qemu_mknodat(int dirfd, const char *filename, mode_t mode, dev_t dev);
> > +#else
> > +int qemu_mknodat(const char *dirname, const char *filename,
> > + mode_t mode, dev_t dev);
> > +#endif
> >
> > #endif
> > diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
> > index 994f952600..87e8eac840 100644
> > --- a/hw/9pfs/9p.h
> > +++ b/hw/9pfs/9p.h
> > @@ -3,13 +3,36 @@
> >
> > #include <dirent.h>
> > #include <utime.h>
> > +#ifndef CONFIG_WIN32
> > #include <sys/resource.h>
> > +#endif
> > #include "fsdev/file-op-9p.h"
> > #include "fsdev/9p-iov-marshal.h"
> > #include "qemu/thread.h"
> > #include "qemu/coroutine.h"
> > #include "qemu/qht.h"
> >
> > +#ifdef CONFIG_WIN32
> > +
> > +#define O_NOCTTY 0
> > +#define O_NDELAY 0
> > +#define O_NONBLOCK 0
> > +#define O_DSYNC 0
> > +#define O_DIRECT 0
> > +#define O_NOFOLLOW 0
> > +#define O_NOATIME 0
> > +#define O_SYNC 0
> > +#define O_ASYNC 0
> > +#define O_DIRECTORY 02000000
>
> Again, these are POSIX types. I don't think declaring them belongs into this
> header file.
>
> > +
> > +#define FASYNC 0
> > +
> > +#define AT_REMOVEDIR 1
> > +
> > +#define NAME_MAX 260
> > +
> > +#endif
> > +
> > enum {
> > P9_TLERROR = 6,
> > P9_RLERROR,
> > diff --git a/hw/9pfs/9p-local-win32.c b/hw/9pfs/9p-local-win32.c
> > new file mode 100644
> > index 0000000000..aab7c9f7b5
> > --- /dev/null
> > +++ b/hw/9pfs/9p-local-win32.c
> > @@ -0,0 +1,1242 @@
> > +/*
> > + * 9p Windows callback
> > + *
> > + * Copyright (c) 2022 Wind River Systems, Inc.
> > + *
> > + * Based on hw/9pfs/9p-local.c
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2. See
> > + * the COPYING file in the top-level directory.
> > + */
> > +
> > +/*
> > + * Not so fast! You might want to read the 9p developer docs first:
> > + * https://wiki.qemu.org/Documentation/9p
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include <windows.h>
> > +#include <dirent.h>
> > +#include "9p.h"
> > +#include "9p-local.h"
> > +#include "9p-xattr.h"
> > +#include "9p-util.h"
> > +#include "fsdev/qemu-fsdev.h" /* local_ops */
> > +#include "qapi/error.h"
> > +#include "qemu/cutils.h"
> > +#include "qemu/error-report.h"
> > +#include "qemu/option.h"
> > +#include <libgen.h>
>
> I'm not sure whether all of this (i.e. 9p-local-win32.c in general) is really
> needed. I mean yes, it probably does the job, but you basically add a
> complete
> separate 'local' backend implementation just for the Windows host platform.
>
> My expectation would be to stick to 9p-local.c being OS-agnostic, and only
> define OS-specific functionality in 9p-util-windows.c if needed.
>
> And most importantly: don't duplicate code as far as possible! I mean
> somebody
> would need to also review and maintain all of this.
Actually, almost all FileOperations functions are re-written for Windows host.
Here is the comparison statistics for 9p-local.c and 9p-local-win32.c:
Total lines : 1611
Changed lines: 590
Inserted lines: 138
Removed lines: 414
For function level difference count:
Changed function: 39
Unchanged function: 13
If use "#ifdef _WIN32" to sperate Windows host code, it may need to be inserted
about 150 code blocks (or 39 code blocks for all changed functions).
I am not sure if it is a good idea to insert so many "#ifdef _WIN32", it may
cause this file not readable.
If stick to 9p-local.c being OS-agnostic, I think it is better to create two
new files: 9p-local-linux.c and 9p-local-win32.c
>
> > +
> > +static inline int openfile_with_ctx(FsContext *fs_ctx, const char *name,
> > + int flags, mode_t mode)
> > +{
> > + char *full_file_name;
> > + int fd;
> > +
> > + full_file_name = merge_fs_path(fs_ctx->fs_root, name);
> > + fd = open(full_file_name, flags | _O_BINARY, mode);
> > + g_free(full_file_name);
> > +
> > + return fd;
> > +}
> > +
> > +static inline DIR *opendir_with_ctx(FsContext *fs_ctx, const char *name)
> > +{
> > + char *full_file_name;
> > + DIR *dir;
> > +
> > + full_file_name = merge_fs_path(fs_ctx->fs_root, name);
> > + dir = opendir(full_file_name);
> > + g_free(full_file_name);
> > + return dir;
> > +}
> > +
> > +int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags,
> > + mode_t mode)
> > +{
> > + int fd;
> > +
> > + if (path[strlen(path) - 1] == '/' || (flags & O_DIRECTORY) != 0) {
> > + /* Windows does not allow call open() for a directory */
> > + fd = -1;
> > + } else {
> > + fd = openfile_with_ctx(fs_ctx, path, flags, mode);
> > + }
> > +
> > + return fd;
> > +}
> > +
> > +DIR *local_opendir_nofollow(FsContext *fs_ctx, const char *path)
> > +{
> > + return opendir_with_ctx(fs_ctx, path);
> > +}
> > +
> > +static FILE *local_fopenat(const char *dirname, const char *name,
> > + const char *mode)
> > +{
> > + char *full_file_name;
> > + char modestr[3] = {0};
> > + FILE *fp;
> > +
> > + /*
> > + * only supports two modes
> > + */
> > + if (mode[0] == 'r') {
> > + modestr[0] = 'r';
> > + } else if (mode[0] == 'w') {
> > + modestr[0] = 'w';
> > + } else {
> > + return NULL;
> > + }
> > + /* Windows host needs 'b' flag */
> > + modestr[1] = 'b';
> > +
> > + full_file_name = merge_fs_path(dirname, name);
> > + fp = fopen(full_file_name, modestr);
> > + g_free(full_file_name);
> > +
> > + return fp;
> > +}
> > +
> > +static void local_mapped_file_attr(const char *dirpath, const char *name,
> > + struct stat *stbuf)
> > +{
> > + FILE *fp;
> > + char buf[ATTR_MAX];
> > + char *full_file_name;
> > +
> > + if (strcmp(name, ".") != 0) {
> > + full_file_name = merge_fs_path(dirpath, VIRTFS_META_DIR);
> > + fp = local_fopenat(full_file_name, name, "r");
> > + g_free(full_file_name);
> > + } else {
> > + fp = local_fopenat(dirpath, VIRTFS_META_ROOT_FILE, "r");
> > + }
> > + if (!fp) {
> > + return;
> > + }
> > +
> > + memset(buf, 0, ATTR_MAX);
> > + while (fgets(buf, ATTR_MAX, fp)) {
> > + if (!strncmp(buf, "virtfs.uid", 10)) {
> > + stbuf->st_uid = atoi(buf + 11);
> > + } else if (!strncmp(buf, "virtfs.gid", 10)) {
> > + stbuf->st_gid = atoi(buf + 11);
> > + } else if (!strncmp(buf, "virtfs.mode", 11)) {
> > + stbuf->st_mode = (stbuf->st_mode & ~0777);
> > + stbuf->st_mode |= (atoi(buf + 12) & 0777);
> > + } else if (!strncmp(buf, "virtfs.rdev", 11)) {
> > + stbuf->st_rdev = atoi(buf + 12);
> > + }
> > + memset(buf, 0, ATTR_MAX);
> > + }
> > + fclose(fp);
> > +}
> > +
> > +static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat
> > *stbuf) +{
> > + int err = -1;
> > + char *full_dir_name, *full_file_name;
> > + char *dirpath = g_path_get_dirname(fs_path->data);
> > + char *name = g_path_get_basename(fs_path->data);
> > +
> > + full_dir_name = merge_fs_path(fs_ctx->fs_root, dirpath);
> > + full_file_name = merge_fs_path(full_dir_name, name);
> > + err = stat(full_file_name, stbuf);
> > +
> > + if (err == 0 && strcmp(fs_path->data, ".") == 0) {
> > + /*
> > + * Hard code for root directory on Windows host.
> > + * This will root directory have a special inode number,
> > + * then guest OS can detect it is a special directory.
> > + */
> > + stbuf->st_ino = 2;
> > + }
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
> > + /* Actual credentials are part of extended attrs */
> > + uid_t tmp_uid;
> > + gid_t tmp_gid;
> > + mode_t tmp_mode;
> > + dev_t tmp_dev;
> > +
> > + if (fgetxattrat_nofollow(full_dir_name, name, "user.virtfs.uid",
> > + &tmp_uid, sizeof(uid_t)) > 0) {
> > + stbuf->st_uid = le32_to_cpu(tmp_uid);
> > + }
> > + if (fgetxattrat_nofollow(full_dir_name, name, "user.virtfs.gid",
> > + &tmp_gid, sizeof(gid_t)) > 0) {
> > + stbuf->st_gid = le32_to_cpu(tmp_gid);
> > + }
> > + if (fgetxattrat_nofollow(full_dir_name, name, "user.virtfs.mode",
> > + &tmp_mode, sizeof(mode_t)) > 0) {
> > + stbuf->st_mode = (stbuf->st_mode & ~0777);
> > + stbuf->st_mode |= le32_to_cpu(tmp_mode);
> > + }
> > + if (fgetxattrat_nofollow(full_dir_name, name, "user.virtfs.rdev",
> > + &tmp_dev, sizeof(dev_t)) > 0) {
> > + stbuf->st_rdev = le64_to_cpu(tmp_dev);
> > + }
> > + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + local_mapped_file_attr(full_dir_name, name, stbuf);
> > + }
> > +
> > + g_free(full_file_name);
> > + g_free(full_dir_name);
> > +
> > + if (err) {
> > + goto err_out;
> > + }
> > +
> > +err_out:
> > + g_free(name);
> > + g_free(dirpath);
> > + return err;
> > +}
> > +
> > +static int local_set_mapped_file_attrat(const char *dirname, const char
> > *name, + FsCred *credp)
> > +{
> > + FILE *fp;
> > + int ret;
> > + char buf[ATTR_MAX];
> > + int uid = -1, gid = -1, mode = -1, rdev = -1;
> > + bool is_root = !strcmp(name, ".");
> > + char *full_dir_name;
> > +
> > + if (is_root) {
> > + fp = local_fopenat(dirname, VIRTFS_META_ROOT_FILE, "r");
> > + if (!fp) {
> > + if (errno == ENOENT) {
> > + goto update_map_file;
> > + } else {
> > + return -1;
> > + }
> > + }
> > + } else {
> > + /*
> > + * mapped-file:
> > + * <sub_file> attribute stored to:
> > + * <directory> + VIRTFS_META_DIR + <sub_file_name>
> > + */
> > + full_dir_name = merge_fs_path(dirname, VIRTFS_META_DIR);
> > + ret = mkdir(full_dir_name);
> > +
> > + if (ret < 0 && errno != EEXIST) {
> > + g_free(full_dir_name);
> > + return -1;
> > + }
> > +
> > + fp = local_fopenat(full_dir_name, name, "r");
> > + if (!fp) {
> > + if (errno == ENOENT) {
> > + goto update_map_file;
> > + } else {
> > + g_free(full_dir_name);
> > + return -1;
> > + }
> > + }
> > + }
> > +
> > + memset(buf, 0, ATTR_MAX);
> > + while (fgets(buf, ATTR_MAX, fp)) {
> > + if (!strncmp(buf, "virtfs.uid", 10)) {
> > + uid = atoi(buf + 11);
> > + } else if (!strncmp(buf, "virtfs.gid", 10)) {
> > + gid = atoi(buf + 11);
> > + } else if (!strncmp(buf, "virtfs.mode", 11)) {
> > + mode = atoi(buf + 12);
> > + } else if (!strncmp(buf, "virtfs.rdev", 11)) {
> > + rdev = atoi(buf + 12);
> > + }
> > + memset(buf, 0, ATTR_MAX);
> > + }
> > + fclose(fp);
> > +
> > +update_map_file:
> > + if (is_root) {
> > + fp = local_fopenat(dirname, VIRTFS_META_ROOT_FILE, "w");
> > + } else {
> > + fp = local_fopenat(full_dir_name, name, "w");
> > + g_free(full_dir_name);
> > + }
> > + if (!fp) {
> > + return -1;
> > + }
> > +
> > + if (credp->fc_uid != -1) {
> > + uid = credp->fc_uid;
> > + }
> > + if (credp->fc_gid != -1) {
> > + gid = credp->fc_gid;
> > + }
> > + if (credp->fc_mode != (mode_t)-1) {
> > + mode = credp->fc_mode;
> > + }
> > + if (credp->fc_rdev != -1) {
> > + rdev = credp->fc_rdev;
> > + }
> > +
> > + if (uid != -1) {
> > + fprintf(fp, "virtfs.uid=%d\n", uid);
> > + }
> > + if (gid != -1) {
> > + fprintf(fp, "virtfs.gid=%d\n", gid);
> > + }
> > + if (mode != -1) {
> > + fprintf(fp, "virtfs.mode=%d\n", mode);
> > + }
> > + if (rdev != -1) {
> > + fprintf(fp, "virtfs.rdev=%d\n", rdev);
> > + }
> > + fclose(fp);
> > +
> > + return 0;
> > +}
> > +
> > +static int local_set_xattrat(const char *dirname, const char *path,
> > + FsCred *credp)
> > +{
> > + int err;
> > +
> > + if (credp->fc_uid != -1) {
> > + uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
> > + err = fsetxattrat_nofollow(dirname, path, "user.virtfs.uid",
> > + &tmp_uid, sizeof(uid_t), 0);
> > + if (err) {
> > + return err;
> > + }
> > + }
> > + if (credp->fc_gid != -1) {
> > + uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
> > + err = fsetxattrat_nofollow(dirname, path, "user.virtfs.gid",
> > + &tmp_gid, sizeof(gid_t), 0);
> > + if (err) {
> > + return err;
> > + }
> > + }
> > + if (credp->fc_mode != (mode_t)-1) {
> > + uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
> > + err = fsetxattrat_nofollow(dirname, path, "user.virtfs.mode",
> > + &tmp_mode, sizeof(mode_t), 0);
> > + if (err) {
> > + return err;
> > + }
> > + }
> > + if (credp->fc_rdev != -1) {
> > + uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
> > + err = fsetxattrat_nofollow(dirname, path, "user.virtfs.rdev",
> > + &tmp_rdev, sizeof(dev_t), 0);
> > + if (err) {
> > + return err;
> > + }
> > + }
> > + return 0;
> > +}
> > +
> > +static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
> > + char *buf, size_t bufsz)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
> > +{
> > + return close(fs->fd);
> > +}
> > +
> > +static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
> > +{
> > + return closedir(fs->dir.stream);
> > +}
> > +
> > +static int local_open(FsContext *ctx, V9fsPath *fs_path,
> > + int flags, V9fsFidOpenState *fs)
> > +{
> > + int fd;
> > +
> > + fd = local_open_nofollow(ctx, fs_path->data, flags, 0);
> > + if (fd == -1) {
> > + return -1;
> > + }
> > + fs->fd = fd;
> > + return fs->fd;
> > +}
> > +
> > +static int local_opendir(FsContext *ctx,
> > + V9fsPath *fs_path, V9fsFidOpenState *fs)
> > +{
> > + DIR *stream;
> > + char *full_file_name;
> > +
> > + full_file_name = merge_fs_path(ctx->fs_root, fs_path->data);
> > + stream = opendir(full_file_name);
> > + g_free(full_file_name);
> > +
> > + if (!stream) {
> > + return -1;
> > + }
> > +
> > + fs->dir.stream = stream;
> > + return 0;
> > +}
> > +
> > +static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
> > +{
> > + rewinddir(fs->dir.stream);
> > +}
> > +
> > +static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
> > +{
> > + return telldir(fs->dir.stream);
> > +}
> > +
> > +static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
> > +{
> > + struct dirent *entry;
> > +
> > +again:
> > + entry = readdir(fs->dir.stream);
> > + if (!entry) {
> > + return NULL;
> > + }
> > +
> > + if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + if (local_is_mapped_file_metadata(ctx, entry->d_name)) {
> > + /* skip the meta data */
> > + goto again;
> > + }
> > + }
> > +
> > + return entry;
> > +}
> > +
> > +static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
> > +{
> > + off_t count;
> > + struct dirent *findentry;
> > + struct dirent *entry;
> > + size_t namelen[3] = {0};
> > + off_t direntoff[3] = {-1, -1, -1};
> > + char *d_name[3];
> > + int i;
> > +
> > + /*
> > + * MinGW's seekdir() requires directory is not modified. If guest OS
> is
> > + * modifying the directory when calling seekdir(), e.g.: "rm -rf *", +
> > * then MinGW's seekdir() will seek to a wrong offset.
> > + *
> > + * This function saves some old offset directory entry name,
> > + * and lookup current entry again, and compare the offset.
> > + *
> > + * If new offset is less than old offset, that means someone is
> > deleting + * files in the directory, thus we need to seek offset
> > backward. + *
> > + * If new offset is larger than old offset, that means someone is
> > creating + * files in the directory, thus we need to seek offset
> > forward. + */
> > +
> > + direntoff[0] = telldir(fs->dir.stream);
> > +
> > + /* do nothing if current offset is 0 or EOF */
> > + if (direntoff[0] == 0 || direntoff[0] < 0) {
> > + seekdir(fs->dir.stream, off);
> > + return ;
> > + }
> > +
> > + d_name[0] = g_malloc0(sizeof(entry->d_name) * 3);
> > + d_name[1] = d_name[0] + sizeof(entry->d_name);
> > + d_name[2] = d_name[1] + sizeof(entry->d_name);
> > +
> > + /* save 3 nearest entries and offsets */
> > + for (i = 0; i < 3; i++) {
> > + entry = &fs->dir.stream->dd_dir;
> > +
> > + memcpy(d_name[i], entry->d_name, entry->d_namlen);
> > + namelen[i] = strlen(d_name[i]) + 1;
> > +
> > + direntoff[i] = telldir(fs->dir.stream);
> > +
> > + entry = readdir(fs->dir.stream);
> > + if (entry == NULL) {
> > + break;
> > + }
> > + }
> > +
> > + /* lookup saved entries again */
> > + for (i = 0; i < 3 && direntoff[i] != -1; i++) {
> > + rewinddir(fs->dir.stream);
> > + count = 0;
> > + while ((findentry = readdir(fs->dir.stream)) != NULL) {
> > + count++;
> > +
> > + if (memcmp(findentry->d_name, d_name[i], namelen[i]) == 0) {
> > + if (count + i == direntoff[i]) {
> > + seekdir(fs->dir.stream, off);
> > + goto out;
> > + } else if (count + i < direntoff[i]) {
> > + off = off - (direntoff[i] - count) - i;
> > + if (off <= 0) {
> > + off = 0;
> > + }
> > + seekdir(fs->dir.stream, off);
> > + goto out;
> > + } else {
> > + off = off + (count - direntoff[i]) - i;
> > + seekdir(fs->dir.stream, off);
> > + goto out;
> > + }
> > + }
> > + }
> > + }
> > + /* can not get anything, seek backward */
> > + off = off - 1;
> > +
> > + seekdir(fs->dir.stream, off);
> > +out:
> > + g_free(d_name[0]);
> > + return ;
> > +}
> > +
> > +static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
> > + const struct iovec *iov,
> > + int iovcnt, off_t offset)
> > +{
> > +#ifdef CONFIG_PREADV
> > + return preadv(fs->fd, iov, iovcnt, offset);
> > +#else
> > + int err = lseek(fs->fd, offset, SEEK_SET);
> > + if (err == -1) {
> > + return err;
> > + } else {
> > + return readv(fs->fd, iov, iovcnt);
> > + }
> > +#endif
> > +}
> > +
> > +static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
> > + const struct iovec *iov,
> > + int iovcnt, off_t offset)
> > +{
> > + ssize_t ret;
> > +#ifdef CONFIG_PREADV
> > + ret = pwritev(fs->fd, iov, iovcnt, offset);
> > +#else
> > + int err = lseek(fs->fd, offset, SEEK_SET);
> > + if (err == -1) {
> > + return err;
> > + } else {
> > + ret = writev(fs->fd, iov, iovcnt);
> > + }
> > +#endif
> > +#ifdef CONFIG_SYNC_FILE_RANGE
> > + if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
> > + /*
> > + * Initiate a writeback. This is not a data integrity sync.
> > + * We want to ensure that we don't leave dirty pages in the cache
> > + * after write when writeout=immediate is sepcified.
> > + */
> > + sync_file_range(fs->fd, offset, ret,
> > + SYNC_FILE_RANGE_WAIT_BEFORE |
> > SYNC_FILE_RANGE_WRITE); + }
> > +#endif
> > + return ret;
> > +}
> > +
> > +static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
> > +{
> > + char *dirpath = g_path_get_dirname(fs_path->data);
> > + char *name = g_path_get_basename(fs_path->data);
> > + int ret = -1;
> > + char *full_file_name = NULL;
> > + DIR *dir;
> > + dir = local_opendir_nofollow(fs_ctx, dirpath);
> > + if (dir == NULL) {
> > + goto out;
> > + }
> > + full_file_name = merge_fs_path(fs_ctx->fs_root, dirpath);
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
> > + ret = local_set_xattrat(full_file_name, name, credp);
> > + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + ret = local_set_mapped_file_attrat(full_file_name, name, credp);
> > + } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
> > + fs_ctx->export_flags & V9FS_SM_NONE) {
> > + ret = -1;
> > + errno = ENOTSUP;
> > + }
> > + closedir(dir);
> > +
> > +out:
> > + if (full_file_name != NULL) {
> > + g_free(full_file_name);
> > + }
> > +
> > + g_free(dirpath);
> > + g_free(name);
> > + return ret;
> > +}
> > +
> > +static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
> > + const char *name, FsCred *credp)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
> > + const char *name, FsCred *credp)
> > +{
> > + int err = -1;
> > + char *full_file_name;
> > + char *full_dir_name;
> > + DIR *dir;
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE &&
> > + local_is_mapped_file_metadata(fs_ctx, name)) {
> > + errno = EINVAL;
> > + return -1;
> > + }
> > +
> > + dir = local_opendir_nofollow(fs_ctx, dir_path->data);
> > + if (dir == NULL) {
> > + return -1;
> > + }
> > + closedir(dir);
> > +
> > + full_dir_name = merge_fs_path(fs_ctx->fs_root, dir_path->data);
> > + full_file_name = merge_fs_path(full_dir_name, name);
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
> > + fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + err = mkdir(full_file_name);
> > + if (err == -1) {
> > + goto out;
> > + }
> > + credp->fc_mode = credp->fc_mode;
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
> > + err = local_set_xattrat(full_dir_name, name, credp);
> > + } else {
> > + err = local_set_mapped_file_attrat(full_dir_name, name, credp);
> > + }
> > + if (err == -1) {
> > + rmdir(full_file_name);
> > + }
> > + } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
> > + fs_ctx->export_flags & V9FS_SM_NONE) {
> > + err = mkdir(full_file_name);
> > + if (err == -1) {
> > + goto out;
> > + }
> > + /* Windows does not support chmod, do nothing here */
> > + }
> > +
> > + goto out;
> > +
> > +out:
> > + g_free(full_dir_name);
> > + g_free(full_file_name);
> > + return err;
> > +}
> > +
> > +static int local_fstat(FsContext *fs_ctx, int fid_type,
> > + V9fsFidOpenState *fs, struct stat *stbuf)
> > +{
> > +
> > + int err, fd;
> > + char filename[NAME_MAX];
> > + char *dirpath;
> > + char *name;
> > + HANDLE hFile;
> > + DWORD dwRet;
> > +
> > + if (fid_type == P9_FID_DIR) {
> > + /* Windows does not support open directory */
> > + return -1;
> > + } else {
> > + fd = fs->fd;
> > + }
> > +
> > + err = fstat(fd, stbuf);
> > + if (err) {
> > + return err;
> > + }
> > +
> > + /* get real file name by fd */
> > + hFile = (HANDLE)_get_osfhandle(fd);
> > + dwRet = GetFinalPathNameByHandle(hFile, filename, sizeof(filename), 0);
> > +
> > + if (dwRet >= NAME_MAX) {
> > + return -1;
> > + }
> > + /* skip string "\\\\?\\" return from GetFinalPathNameByHandle() */
> > + memmove(filename, filename + 4, NAME_MAX - 4);
> > +
> > + dirpath = g_path_get_dirname(filename);
> > + name = g_path_get_basename(filename);
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
> > + /* Actual credentials are part of extended attrs */
> > + uid_t tmp_uid;
> > + gid_t tmp_gid;
> > + mode_t tmp_mode;
> > + dev_t tmp_dev;
> > +
> > + if (fgetxattrat_nofollow(dirpath, name, "user.virtfs.uid",
> > + &tmp_uid, sizeof(uid_t)) > 0) {
> > + stbuf->st_uid = le32_to_cpu(tmp_uid);
> > + }
> > + if (fgetxattrat_nofollow(dirpath, name, "user.virtfs.gid",
> > + &tmp_gid, sizeof(gid_t)) > 0) {
> > + stbuf->st_gid = le32_to_cpu(tmp_gid);
> > + }
> > + if (fgetxattrat_nofollow(dirpath, name, "user.virtfs.mode",
> > + &tmp_mode, sizeof(mode_t)) > 0) {
> > + stbuf->st_mode = (stbuf->st_mode & ~0777);
> > + stbuf->st_mode |= le32_to_cpu(tmp_mode);
> > + }
> > + if (fgetxattrat_nofollow(dirpath, name, "user.virtfs.rdev",
> > + &tmp_dev, sizeof(dev_t)) > 0) {
> > + stbuf->st_rdev = le64_to_cpu(tmp_dev);
> > + }
> > + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + errno = EOPNOTSUPP;
> > + g_free(dirpath);
> > + g_free(name);
> > + return -1;
> > + }
> > +
> > + g_free(dirpath);
> > + g_free(name);
> > +
> > + return err;
> > +}
> > +
> > +static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char
> > *name, + int flags, FsCred *credp, V9fsFidOpenState
> > *fs) +{
> > + int fd = -1;
> > + int err = -1;
> > + char *full_file_name;
> > +
> > + if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE &&
> > + local_is_mapped_file_metadata(fs_ctx, name)) {
> > + errno = EINVAL;
> > + return -1;
> > + }
> > +
> > + full_file_name = merge_fs_path(dir_path->data, name);
> > + fd = openfile_with_ctx(fs_ctx, full_file_name, flags, credp->fc_mode);
> > + g_free(full_file_name);
> > +
> > + err = fd;
> > + fs->fd = fd;
> > + goto out;
> > +
> > + close_preserve_errno(fd);
> > +out:
> > + return err;
> > +}
> > +
> > +
> > +static int local_symlink(FsContext *fs_ctx, const char *oldpath,
> > + V9fsPath *dir_path, const char *name, FsCred
> > *credp) +{
> > + return -1;
> > +}
> > +
> > +static int local_link(FsContext *ctx, V9fsPath *oldpath,
> > + V9fsPath *dirpath, const char *name)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
> > +{
> > + int fd, ret;
> > +
> > + fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
> > + if (fd == -1) {
> > + return -1;
> > + }
> > + ret = ftruncate(fd, size);
> > + close_preserve_errno(fd);
> > + return ret;
> > +}
> > +
> > +static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
> > +{
> > + char *full_file_name;
> > + char *dirpath = g_path_get_dirname(fs_path->data);
> > + char *name = g_path_get_basename(fs_path->data);
> > + int ret = -1;
> > + DIR *dir;
> > +
> > + dir = local_opendir_nofollow(fs_ctx, dirpath);
> > + if (dir == NULL) {
> > + goto out;
> > + }
> > + full_file_name = merge_fs_path(fs_ctx->fs_root, dirpath);
> > +
> > + if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
> > + (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
> > + (fs_ctx->export_flags & V9FS_SM_NONE)) {
> > + /* Windows does not support chown() */
> > + ret = -1;
> > + errno = ENOTSUP;
> > + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
> > + ret = local_set_xattrat(full_file_name, name, credp);
> > + } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + ret = local_set_mapped_file_attrat(full_file_name, name, credp);
> > + }
> > + g_free(full_file_name);
> > + closedir(dir);
> > +out:
> > + g_free(name);
> > + g_free(dirpath);
> > + return ret;
> > +}
> > +
> > +static int local_utimensat(FsContext *s, V9fsPath *fs_path,
> > + const struct timespec *buf)
> > +{
> > + struct utimbuf tm;
> > + char *full_file_name;
> > + int err;
> > +
> > + tm.actime = buf[0].tv_sec;
> > + tm.modtime = buf[1].tv_sec;
> > +
> > + full_file_name = merge_fs_path(s->fs_root, fs_path->data);
> > + err = utime(full_file_name, &tm);
> > + g_free(full_file_name);
> > +
> > + return err;
> > +}
> > +
> > +static int local_unlinkat_common(FsContext *ctx, const char *dirname,
> > + const char *name, int flags)
> > +{
> > + int ret;
> > + char *full_file_name;
> > + char *full_dir_name;
> > +
> > + full_dir_name = merge_fs_path(ctx->fs_root, dirname);
> > + full_file_name = merge_fs_path(full_dir_name, name);
> > +
> > + if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + char *full_meta_dir_name;
> > + char *full_meta_file_name;
> > +
> > + /*
> > + * We need to remove the metadata as well:
> > + * - the metadata directory if we're removing a directory
> > + * - the metadata file in the parent's metadata directory
> > + *
> > + * If any of these are missing (ie, ENOENT) then we're probably
> > + * trying to remove something that wasn't created in mapped-file
> > + * mode. We just ignore the error.
> > + */
> > +
> > + if ((flags & AT_REMOVEDIR) != 0) {
> > + full_meta_dir_name = merge_fs_path(full_file_name,
> > VIRTFS_META_DIR); + ret = rmdir(full_meta_dir_name);
> > + g_free(full_meta_dir_name);
> > +
> > + if (ret < 0 && errno != ENOENT) {
> > + g_free(full_file_name);
> > + g_free(full_dir_name);
> > + return -1;
> > + }
> > + }
> > +
> > + full_meta_dir_name = merge_fs_path(full_dir_name, VIRTFS_META_DIR);
> > + full_meta_file_name = merge_fs_path(full_meta_dir_name, name); +
> > ret = remove(full_meta_file_name);
> > + g_free(full_meta_dir_name);
> > + g_free(full_meta_file_name);
> > +
> > + if (ret < 0 && errno != ENOENT) {
> > + g_free(full_dir_name);
> > + g_free(full_file_name);
> > +
> > + return -1;
> > + }
> > + }
> > +
> > + if ((flags & AT_REMOVEDIR) != 0) {
> > + ret = rmdir(full_file_name);
> > + } else {
> > + ret = remove(full_file_name);
> > + }
> > +
> > + g_free(full_dir_name);
> > + g_free(full_file_name);
> > +
> > + return ret;
> > +}
> > +
> > +static int local_remove(FsContext *ctx, const char *path)
> > +{
> > + int err;
> > + DIR *stream;
> > + char *full_file_name;
> > + char *dirpath = g_path_get_dirname(path);
> > + char *name = g_path_get_basename(path);
> > + int flags = 0;
> > +
> > + full_file_name = merge_fs_path(ctx->fs_root, path);
> > + stream = opendir(full_file_name);
> > + if (stream != NULL) {
> > + closedir(stream);
> > + flags |= AT_REMOVEDIR;
> > + }
> > + err = local_unlinkat_common(ctx, dirpath, name, flags);
> > +
> > + g_free(name);
> > + g_free(dirpath);
> > + g_free(full_file_name);
> > + return err;
> > +}
> > +
> > +static int local_fsync(FsContext *ctx, int fid_type,
> > + V9fsFidOpenState *fs, int datasync)
> > +{
> > + if (fid_type != P9_FID_DIR) {
> > + return _commit(fs->fd);
> > + }
> > + return 0;
> > +}
> > +
> > +static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs
> > *stbuf) +{
> > + int ret;
> > + ret = qemu_statfs(s->fs_root, stbuf);
> > + if (ret == 0) {
> > + /* use context address as fsid */
> > + memcpy(&stbuf->f_fsid, s, sizeof(long));
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
> > + const char *name, void *value, size_t size)
> > +{
> > + return -1;
> > +}
> > +
> > +static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
> > + void *value, size_t size)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char
> > *name, + void *value, size_t size, int flags)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
> > + const char *name)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
> > + const char *name, V9fsPath *target)
> > +{
> > + if (ctx->export_flags & V9FS_SM_MAPPED_FILE &&
> > + local_is_mapped_file_metadata(ctx, name)) {
> > + errno = EINVAL;
> > + return -1;
> > + }
> > +
> > + if (dir_path) {
> > + if (!strcmp(name, ".")) {
> > + /* "." relative to "foo/bar" is "foo/bar" */
> > + v9fs_path_copy(target, dir_path);
> > + } else if (!strcmp(name, "..")) {
> > + if (!strcmp(dir_path->data, ".")) {
> > + /* ".." relative to the root is "." */
> > + v9fs_path_sprintf(target, ".");
> > + } else {
> > + char *tmp = g_path_get_dirname(dir_path->data);
> > + /*
> > + * Symbolic links are resolved by the client. We can
> assume
> > + * that ".." relative to "foo/bar" is equivalent to "foo"
> > + */
> > + v9fs_path_sprintf(target, "%s", tmp);
> > + g_free(tmp);
> > + }
> > + } else {
> > + assert(!strchr(name, '/'));
> > + v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
> > + }
> > + } else if (!strcmp(name, "/") || !strcmp(name, ".") ||
> > + !strcmp(name, "..")) {
> > + /* This is the root fid */
> > + v9fs_path_sprintf(target, ".");
> > + } else {
> > + assert(!strchr(name, '/'));
> > + v9fs_path_sprintf(target, "./%s", name);
> > + }
> > + return 0;
> > +}
> > +
> > +static int local_renameat(FsContext *ctx, V9fsPath *olddir,
> > + const char *old_name, V9fsPath *newdir,
> > + const char *new_name)
> > +{
> > + return -1;
> > +}
> > +
> > +static int local_rename(FsContext *ctx, const char *oldpath,
> > + const char *newpath)
> > +{
> > + int err;
> > +
> > + char *full_old_name;
> > + char *full_new_name;
> > +
> > + full_old_name = merge_fs_path(ctx->fs_root, oldpath);
> > + full_new_name = merge_fs_path(ctx->fs_root, newpath);
> > +
> > + err = rename(full_old_name, full_new_name);
> > +
> > + g_free(full_old_name);
> > + g_free(full_new_name);
> > +
> > + return err;
> > +}
> > +
> > +static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
> > + const char *name, int flags)
> > +{
> > + int ret;
> > +
> > + if (ctx->export_flags & V9FS_SM_MAPPED_FILE &&
> > + local_is_mapped_file_metadata(ctx, name)) {
> > + errno = EINVAL;
> > + return -1;
> > + }
> > +
> > + ret = local_unlinkat_common(ctx, dir->data, name, flags);
> > +
> > + return ret;
> > +}
> > +
> > +static int check_filesystem_type(char *fs_root, int export_flags)
> > +{
> > + HANDLE hFile;
> > + wchar_t FsName[MAX_PATH + 1] = {0};
> > + wchar_t NtfsName[5] = {'N', 'T', 'F', 'S'};
> > +
> > + if ((export_flags & V9FS_SM_MAPPED) == 0) {
> > + return 0;
> > + }
> > +
> > + hFile = CreateFile(fs_root, GENERIC_READ, FILE_SHARE_READ, NULL,
> > + OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
> > + if (hFile == INVALID_HANDLE_VALUE) {
> > + return -1;
> > + }
> > +
> > + /* Get file system type name */
> > + if (GetVolumeInformationByHandleW(hFile, NULL, 0, NULL, NULL, NULL,
> > + FsName, MAX_PATH + 1) == 0) {
> > + CloseHandle(hFile);
> > + return -1;
> > + }
> > + CloseHandle(hFile);
> > +
> > + if (wcscmp(FsName, NtfsName) != 0) {
> > + return -1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int local_init(FsContext *ctx, Error **errp)
> > +{
> > + LocalData *data = g_malloc(sizeof(*data));
> > +
> > + struct stat StatBuf;
> > +
> > + if (stat(ctx->fs_root, &StatBuf) != 0) {
> > + error_setg_errno(errp, errno, "failed to open '%s'", ctx->fs_root);
> > + goto err;
> > + }
> > +
> > + /*
> > + * security_model=mapped(-xattr) requires a fileystem on Windows that
> > + * supports Alternate Data Stream (ADS). NTFS is one of them, and is
> > + * probably most popular on Windows. It is fair enough to assume
> > + * Windows users to use NTFS for the mapped security model.
> > + */
> > + if (check_filesystem_type(ctx->fs_root, ctx->export_flags) != 0) {
> > + error_setg_errno(errp, EINVAL, "require NTFS file system when "
> > + "security_model is mapped or mapped-xattr");
> > + goto err;
> > + }
> > +
> > + if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
> > + ctx->xops = passthrough_xattr_ops;
> > + } else if (ctx->export_flags & V9FS_SM_MAPPED) {
> > + ctx->xops = mapped_xattr_ops;
> > + } else if (ctx->export_flags & V9FS_SM_NONE) {
> > + ctx->xops = none_xattr_ops;
> > + } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
> > + /*
> > + * xattr operation for mapped-file and passthrough
> > + * remain same.
> > + */
> > + ctx->xops = passthrough_xattr_ops;
> > + }
> > + ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
> > +
> > + ctx->private = data;
> > + return 0;
> > +
> > +err:
> > + g_free(data);
> > + return -1;
> > +}
> > +
> > +static void local_cleanup(FsContext *ctx)
> > +{
> > + LocalData *data = ctx->private;
> > +
> > + if (!data) {
> > + return;
> > + }
> > +
> > + close(data->mountfd);
> > + g_free(data);
> > +}
> > +
> > +static void error_append_security_model_hint(Error *const *errp)
> > +{
> > + error_append_hint(errp, "Valid options are: security_model="
> > + "[passthrough|mapped-xattr|mapped-file|none]\n");
> > +}
> > +
> > +static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error
> > **errp) +{
> > + ERRP_GUARD();
> > + const char *sec_model = qemu_opt_get(opts, "security_model");
> > + const char *path = qemu_opt_get(opts, "path");
> > + const char *multidevs = qemu_opt_get(opts, "multidevs");
> > +
> > + if (!sec_model) {
> > + error_setg(errp, "security_model property not set");
> > + error_append_security_model_hint(errp);
> > + return -1;
> > + }
> > +
> > + if (!strcmp(sec_model, "passthrough")) {
> > + fse->export_flags |= V9FS_SM_PASSTHROUGH;
> > + } else if (!strcmp(sec_model, "mapped") ||
> > + !strcmp(sec_model, "mapped-xattr")) {
> > + fse->export_flags |= V9FS_SM_MAPPED;
> > + } else if (!strcmp(sec_model, "none")) {
> > + fse->export_flags |= V9FS_SM_NONE;
> > + } else if (!strcmp(sec_model, "mapped-file")) {
> > + fse->export_flags |= V9FS_SM_MAPPED_FILE;
> > + } else {
> > + error_setg(errp, "invalid security_model property '%s'",
> > sec_model); + error_append_security_model_hint(errp);
> > + return -1;
> > + }
> > +
> > + if (multidevs) {
> > + if (!strcmp(multidevs, "remap")) {
> > + fse->export_flags &= ~V9FS_FORBID_MULTIDEVS;
> > + fse->export_flags |= V9FS_REMAP_INODES;
> > + } else if (!strcmp(multidevs, "forbid")) {
> > + fse->export_flags &= ~V9FS_REMAP_INODES;
> > + fse->export_flags |= V9FS_FORBID_MULTIDEVS;
> > + } else if (!strcmp(multidevs, "warn")) {
> > + fse->export_flags &= ~V9FS_FORBID_MULTIDEVS;
> > + fse->export_flags &= ~V9FS_REMAP_INODES;
> > + } else {
> > + error_setg(errp, "invalid multidevs property '%s'",
> > + multidevs);
> > + error_append_hint(errp, "Valid options are: multidevs="
> > + "[remap|forbid|warn]\n");
> > + return -1;
> > + }
> > + }
> > +
> > + if (!path) {
> > + error_setg(errp, "path property not set");
> > + return -1;
> > + }
> > +
> > + if (fsdev_throttle_parse_opts(opts, &fse->fst, errp)) {
> > + error_prepend(errp, "invalid throttle configuration: ");
> > + return -1;
> > + }
> > +
> > + if (fse->export_flags & V9FS_SM_MAPPED ||
> > + fse->export_flags & V9FS_SM_MAPPED_FILE) {
> > + fse->fmode =
> > + qemu_opt_get_number(opts, "fmode", SM_LOCAL_MODE_BITS) & 0777;
> > + fse->dmode =
> > + qemu_opt_get_number(opts, "dmode", SM_LOCAL_DIR_MODE_BITS) &
> > 0777; + } else {
> > + if (qemu_opt_find(opts, "fmode")) {
> > + error_setg(errp, "fmode is only valid for mapped security
> > modes"); + return -1;
> > + }
> > + if (qemu_opt_find(opts, "dmode")) {
> > + error_setg(errp, "dmode is only valid for mapped security
> > modes"); + return -1;
> > + }
> > + }
> > +
> > + fse->path = g_strdup(path);
> > +
> > + return 0;
> > +}
> > +
> > +FileOperations local_ops = {
> > + .parse_opts = local_parse_opts,
> > + .init = local_init,
> > + .cleanup = local_cleanup,
> > + .lstat = local_lstat,
> > + .readlink = local_readlink,
> > + .close = local_close,
> > + .closedir = local_closedir,
> > + .open = local_open,
> > + .opendir = local_opendir,
> > + .rewinddir = local_rewinddir,
> > + .telldir = local_telldir,
> > + .readdir = local_readdir,
> > + .seekdir = local_seekdir,
> > + .preadv = local_preadv,
> > + .pwritev = local_pwritev,
> > + .chmod = local_chmod,
> > + .mknod = local_mknod,
> > + .mkdir = local_mkdir,
> > + .fstat = local_fstat,
> > + .open2 = local_open2,
> > + .symlink = local_symlink,
> > + .link = local_link,
> > + .truncate = local_truncate,
> > + .rename = local_rename,
> > + .chown = local_chown,
> > + .utimensat = local_utimensat,
> > + .remove = local_remove,
> > + .fsync = local_fsync,
> > + .statfs = local_statfs,
> > + .lgetxattr = local_lgetxattr,
> > + .llistxattr = local_llistxattr,
> > + .lsetxattr = local_lsetxattr,
> > + .lremovexattr = local_lremovexattr,
> > + .name_to_path = local_name_to_path,
> > + .renameat = local_renameat,
> > + .unlinkat = local_unlinkat,
> > +};
> > diff --git a/hw/9pfs/9p-util-win32.c b/hw/9pfs/9p-util-win32.c
> > new file mode 100644
> > index 0000000000..d9b35e7425
> > --- /dev/null
> > +++ b/hw/9pfs/9p-util-win32.c
> > @@ -0,0 +1,303 @@
> > +/*
> > + * 9p utilities (Windows Implementation)
> > + *
> > + * Copyright (c) 2022 Wind River Systems, Inc.
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2 or
> > later. + * See the COPYING file in the top-level directory.
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include "qapi/error.h"
> > +#include "qemu/error-report.h"
> > +#include "9p.h"
> > +#include "9p-util.h"
> > +#include "9p-linux-errno.h"
> > +#include <windows.h>
> > +#include <dirent.h>
> > +
> > +#ifndef V9FS_MAGIC
> > +#define V9FS_MAGIC 0x53465039 /* string "9PFS" */
> > +#endif
> > +
> > +static int build_ads_name(char *namebuf, size_t namebuflen,
> > + const char *dirname, const char *filename,
> > + const char *ads_name)
> > +{
> > + size_t totalsize;
> > +
> > + totalsize = strlen(dirname) + strlen(filename) + strlen(ads_name) + 3;
> > + if (totalsize > namebuflen) {
> > + return -1;
> > + }
> > +
> > + /*
> > + * NTFS ADS (Alternate Data Streams) name format:
> > + * filename:ads_name
> > + * e.g.
> > + * d:\1.txt:my_ads_name
> > + */
> > + strcpy(namebuf, dirname);
> > + strcat(namebuf, "\\");
> > + strcat(namebuf, filename);
> > + strcat(namebuf, ":");
> > + strcat(namebuf, ads_name);
> > +
> > + return 0;
> > +}
> > +
> > +static ssize_t copy_ads_name(char *namebuf, size_t namebuflen,
> > + char *fulladsname)
> > +{
> > + char *p1, *p2;
> > +
> > + /*
> > + * NTFS ADS (Alternate Data Streams) name from emurate data format:
> > + * :ads_name:$DATA
> > + * e.g.
> > + * :my_ads_name:$DATA
> > + *
> > + * ADS name from FindNextStreamW() always have ":$DATA" string at the
> > end + *
> > + * This function copy ADS name to namebuf.
> > + */
> > +
> > + p1 = strchr(fulladsname, ':');
> > + if (p1 == NULL) {
> > + return -1;
> > + }
> > +
> > + p2 = strchr(p1 + 1, ':');
> > + if (p2 == NULL) {
> > + return -1;
> > + }
> > +
> > + /* skip empty ads name */
> > + if (p2 - p1 == 1) {
> > + return 0;
> > + }
> > +
> > + if (p2 - p1 + 1 > namebuflen) {
> > + return -1;
> > + }
> > +
> > + memcpy(namebuf, p1 + 1, p2 - p1 - 1);
> > + namebuf[p2 - p1 - 1] = '\0';
> > +
> > + return p2 - p1;
> > +}
> > +
> > +ssize_t fgetxattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name, void *value, size_t size)
> > +{
> > + HANDLE hStream;
> > + char ADSFileName[NAME_MAX + 1] = {0};
> > + DWORD dwBytesRead;
> > +
> > + if (build_ads_name(ADSFileName, NAME_MAX, dirname, filename, name) < 0)
> > { + errno = EIO;
> > + return -1;
> > + }
> > +
> > + hStream = CreateFile(ADSFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
> > + OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
> > + if (hStream == INVALID_HANDLE_VALUE &&
> > + GetLastError() == ERROR_FILE_NOT_FOUND) {
> > + errno = ENODATA;
> > + return -1;
> > + }
> > +
> > + if (ReadFile(hStream, value, size, &dwBytesRead, NULL) == FALSE) {
> > + errno = EIO;
> > + CloseHandle(hStream);
> > + return -1;
> > + }
> > +
> > + CloseHandle(hStream);
> > +
> > + return dwBytesRead;
> > +}
> > +
> > +ssize_t flistxattrat_nofollow(const char *dirname, const char *filename,
> > + char *list, size_t size)
> > +{
> > + WCHAR WideCharStr[NAME_MAX + 1] = { 0 };
> > + char fulladsname[NAME_MAX + 1];
> > + char *full_fs_name = merge_fs_path(dirname, filename);
> > + int ret;
> > + HANDLE hFind;
> > + WIN32_FIND_STREAM_DATA fsd;
> > + BOOL bFindNext;
> > + char *listptr = list;
> > + size_t listleftsize = size;
> > +
> > + /*
> > + * ADS emurate function only have WCHAR version, need to covert
> > filename + * to WCHAR string.
> > + */
> > +
> > + ret = MultiByteToWideChar(CP_UTF8, 0, full_fs_name,
> > + strlen(full_fs_name), WideCharStr, NAME_MAX);
> > + g_free(full_fs_name);
> > + if (ret == 0) {
> > + errno = EIO;
> > + return -1;
> > + }
> > +
> > + hFind = FindFirstStreamW(WideCharStr, FindStreamInfoStandard, &fsd, 0);
> > + if (hFind == INVALID_HANDLE_VALUE) {
> > + errno = ENODATA;
> > + return -1;
> > + }
> > +
> > + do {
> > + memset(fulladsname, 0, sizeof(fulladsname));
> > +
> > + /*
> > + * ADS emurate function only have WCHAR version, need to covert
> > + * cStreamName to utf-8 string.
> > + */
> > +
> > + ret = WideCharToMultiByte(CP_UTF8, 0,
> > + fsd.cStreamName, wcslen(fsd.cStreamName)
> > + 1, + fulladsname, sizeof(fulladsname) -
> > 1, + NULL, NULL);
> > +
> > + if (ret == 0) {
> > + if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
> > + errno = ERANGE;
> > + }
> > + CloseHandle(hFind);
> > + return -1;
> > + }
> > +
> > + ret = copy_ads_name(listptr, listleftsize, fulladsname);
> > + if (ret < 0) {
> > + errno = ERANGE;
> > + CloseHandle(hFind);
> > + return -1;
> > + }
> > +
> > + listptr = listptr + ret;
> > + listleftsize = listleftsize - ret;
> > +
> > + bFindNext = FindNextStreamW(hFind, &fsd);
> > + } while (bFindNext);
> > +
> > + CloseHandle(hFind);
> > +
> > + return size - listleftsize;
> > +}
> > +
> > +ssize_t fremovexattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name)
> > +{
> > + char ADSFileName[NAME_MAX + 1] = {0};
> > +
> > + if (build_ads_name(ADSFileName, NAME_MAX, dirname, filename, name) < 0)
> > { + errno = EIO;
> > + return -1;
> > + }
> > +
> > + if (DeleteFile(ADSFileName) != 0) {
> > + if (GetLastError() == ERROR_FILE_NOT_FOUND) {
> > + errno = ENODATA;
> > + return -1;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +int fsetxattrat_nofollow(const char *dirname, const char *filename,
> > + const char *name, void *value, size_t size, int
> > flags) +{
> > + HANDLE hStream;
> > + char ADSFileName[NAME_MAX + 1] = {0};
> > + DWORD dwBytesWrite;
> > +
> > + if (build_ads_name(ADSFileName, NAME_MAX, dirname, filename, name) < 0)
> > { + errno = EIO;
> > + return -1;
> > + }
> > +
> > + hStream = CreateFile(ADSFileName, GENERIC_WRITE, FILE_SHARE_READ, NULL,
> > + CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); +
> > if (hStream == INVALID_HANDLE_VALUE) {
> > + errno = EIO;
> > + return -1;
> > + }
> > +
> > + if (WriteFile(hStream, value, size, &dwBytesWrite, NULL) == FALSE) {
> > + errno = EIO;
> > + CloseHandle(hStream);
> > + return -1;
> > + }
> > +
> > + CloseHandle(hStream);
> > +
> > + return 0;
> > +}
> > +
> > +int qemu_mknodat(const char *dirname, const char *filename,
> > + mode_t mode, dev_t dev)
> > +{
> > + errno = ENOTSUP;
> > + return -1;
> > +}
> > +
> > +int qemu_statfs(const char *fs_root, struct statfs *stbuf)
> > +{
> > + HANDLE hFile;
> > + char RealPath[NAME_MAX + 1];
> > + unsigned long SectorsPerCluster;
> > + unsigned long BytesPerSector;
> > + unsigned long NumberOfFreeClusters;
> > + unsigned long TotalNumberOfClusters;
> > +
> > + hFile = CreateFile(fs_root, GENERIC_READ, FILE_SHARE_READ, NULL,
> > + OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
> > + if (hFile == INVALID_HANDLE_VALUE) {
> > + errno = EIO;
> > + return -1;
> > + }
> > +
> > + /* get real path of root */
> > + if (GetFinalPathNameByHandle(hFile, RealPath, sizeof(RealPath),
> > + FILE_NAME_NORMALIZED) == 0) {
> > + errno = EIO;
> > + CloseHandle(hFile);
> > + return -1;
> > + }
> > +
> > + CloseHandle(hFile);
> > +
> > + /*
> > + * GetFinalPathNameByHandle will return real path start with "\\\\?\\".
> > + * "C:\\123" will be "\\\\?\\C:\\123"
> > + * Skip first 4 bytes and truncate the string at offset 7, it will get
> > + * the real root directory like "C:\\", this is parameter
> > GetDiskFreeSpace + * needed.
> > + */
> > +
> > + RealPath[7] = '\0';
> > +
> > + if (GetDiskFreeSpace(RealPath + 4, &SectorsPerCluster, &BytesPerSector,
> > + &NumberOfFreeClusters, &TotalNumberOfClusters) ==
> > 0) { + errno = EIO;
> > + return -1;
> > + }
> > +
> > + stbuf->f_type = V9FS_MAGIC;
> > + stbuf->f_bsize = (__fsword_t)(SectorsPerCluster * BytesPerSector);
> > + stbuf->f_blocks = (fsblkcnt_t)TotalNumberOfClusters;
> > + stbuf->f_bfree = (fsblkcnt_t)NumberOfFreeClusters;
> > + stbuf->f_bavail = (fsblkcnt_t)NumberOfFreeClusters;
> > + stbuf->f_files = -1;
> > + stbuf->f_ffree = -1;
> > + stbuf->f_namelen = NAME_MAX;
> > + stbuf->f_frsize = 0;
> > + stbuf->f_flags = 0;
> > +
> > + return 0;
> > +}
> > diff --git a/hw/9pfs/9p-xattr.c b/hw/9pfs/9p-xattr.c
> > index 9ae69dd8db..5623f0e2ef 100644
> > --- a/hw/9pfs/9p-xattr.c
> > +++ b/hw/9pfs/9p-xattr.c
> > @@ -78,10 +78,45 @@ ssize_t v9fs_list_xattr(FsContext *ctx, const char
> > *path, char *orig_value, *orig_value_start;
> > ssize_t xattr_len, parsed_len = 0, attr_len;
> > char *dirpath, *name;
> > +#ifdef CONFIG_WIN32
> > + char *full_dir_path;
> > + DIR *dir;
> > +#else
> > int dirfd;
> > +#endif
> >
> > /* Get the actual len */
> > dirpath = g_path_get_dirname(path);
> > +
> > +#ifdef CONFIG_WIN32
> > + dir = local_opendir_nofollow(ctx, dirpath);
> > + if (dir == NULL) {
> > + return -1;
> > + }
> > + closedir(dir);
> > +
> > + full_dir_path = merge_fs_path(ctx->fs_root, dirpath);
> > + g_free(dirpath);
> > +
> > + name = g_path_get_basename(path);
> > + xattr_len = flistxattrat_nofollow(full_dir_path, name, value, 0);
> > + if (xattr_len <= 0) {
> > + g_free(name);
> > + g_free(full_dir_path);
> > + return xattr_len;
> > + }
> > +
> > + /* Now fetch the xattr and find the actual size */
> > + orig_value = g_malloc(xattr_len);
> > + xattr_len = flistxattrat_nofollow(full_dir_path, name, orig_value,
> > + xattr_len);
> > + g_free(name);
> > + g_free(full_dir_path);
> > + if (xattr_len < 0) {
> > + g_free(orig_value);
> > + return -1;
> > + }
> > +#else
> > dirfd = local_opendir_nofollow(ctx, dirpath);
> > g_free(dirpath);
> > if (dirfd == -1) {
> > @@ -105,6 +140,7 @@ ssize_t v9fs_list_xattr(FsContext *ctx, const char
> > *path, g_free(orig_value);
> > return -1;
> > }
> > +#endif
> >
> > /* store the orig pointer */
> > orig_value_start = orig_value;
> > @@ -166,6 +202,31 @@ int v9fs_remove_xattr(FsContext *ctx,
> > ssize_t local_getxattr_nofollow(FsContext *ctx, const char *path,
> > const char *name, void *value, size_t size)
> > {
> > +#ifdef CONFIG_WIN32
> > + char *dirpath = g_path_get_dirname(path);
> > + char *filename = g_path_get_basename(path);
> > + char *full_dir_path;
> > + DIR *dir;
> > + ssize_t ret = -1;
> > +
> > + full_dir_path = merge_fs_path(ctx->fs_root, dirpath);
> > +
> > + dir = local_opendir_nofollow(ctx, dirpath);
> > + if (dir == NULL) {
> > + goto out;
> > + }
> > + closedir(dir);
> > +
> > + ret = fgetxattrat_nofollow(full_dir_path, filename,
> > + name, value, size);
> > +
> > +out:
> > + g_free(full_dir_path);
> > + g_free(dirpath);
> > + g_free(filename);
> > +
> > + return ret;
> > +#else
> > char *dirpath = g_path_get_dirname(path);
> > char *filename = g_path_get_basename(path);
> > int dirfd;
> > @@ -177,11 +238,13 @@ ssize_t local_getxattr_nofollow(FsContext *ctx, const
> > char *path, }
> >
> > ret = fgetxattrat_nofollow(dirfd, filename, name, value, size);
> > +
> > close_preserve_errno(dirfd);
> > out:
> > g_free(dirpath);
> > g_free(filename);
> > return ret;
> > +#endif
> > }
> >
> > ssize_t pt_getxattr(FsContext *ctx, const char *path, const char *name,
> > @@ -194,6 +257,30 @@ ssize_t local_setxattr_nofollow(FsContext *ctx, const
> > char *path, const char *name, void *value, size_t size, int flags)
> > {
> > +#ifdef CONFIG_WIN32
> > + char *dirpath = g_path_get_dirname(path);
> > + char *filename = g_path_get_basename(path);
> > + char *full_dir_path;
> > + DIR *dir;
> > + ssize_t ret = -1;
> > +
> > + full_dir_path = merge_fs_path(ctx->fs_root, dirpath);
> > +
> > + dir = local_opendir_nofollow(ctx, dirpath);
> > + if (dir == NULL) {
> > + goto out;
> > + }
> > + closedir(dir);
> > +
> > + ret = fsetxattrat_nofollow(full_dir_path, filename, name,
> > + value, size, flags);
> > +out:
> > + g_free(full_dir_path);
> > + g_free(dirpath);
> > + g_free(filename);
> > + return ret;
> > +
> > +#else
> > char *dirpath = g_path_get_dirname(path);
> > char *filename = g_path_get_basename(path);
> > int dirfd;
> > @@ -210,6 +297,7 @@ out:
> > g_free(dirpath);
> > g_free(filename);
> > return ret;
> > +#endif
> > }
> >
> > int pt_setxattr(FsContext *ctx, const char *path, const char *name, void
> > *value, @@ -221,6 +309,30 @@ int pt_setxattr(FsContext *ctx, const char
> > *path, const char *name, void *value, ssize_t
> > local_removexattr_nofollow(FsContext *ctx, const char *path, const char
> > *name)
> > {
> > +#ifdef CONFIG_WIN32
> > + char *dirpath = g_path_get_dirname(path);
> > + char *filename = g_path_get_basename(path);
> > + char *full_dir_path;
> > + DIR *dir;
> > + ssize_t ret = -1;
> > +
> > + full_dir_path = merge_fs_path(ctx->fs_root, dirpath);
> > +
> > + dir = local_opendir_nofollow(ctx, dirpath);
> > + if (dir == NULL) {
> > + goto out;
> > + }
> > + closedir(dir);
> > +
> > + ret = fremovexattrat_nofollow(full_dir_path, filename, name);
> > +
> > +out:
> > + g_free(full_dir_path);
> > + g_free(dirpath);
> > + g_free(filename);
> > + return ret;
> > +
> > +#else
> > char *dirpath = g_path_get_dirname(path);
> > char *filename = g_path_get_basename(path);
> > int dirfd;
> > @@ -237,6 +349,7 @@ out:
> > g_free(dirpath);
> > g_free(filename);
> > return ret;
> > +#endif
> > }
> >
> > int pt_removexattr(FsContext *ctx, const char *path, const char *name)
> > diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
> > index 225f31fc31..a04889c1d6 100644
> > --- a/hw/9pfs/9p.c
> > +++ b/hw/9pfs/9p.c
> > @@ -38,6 +38,10 @@
> > #include "migration/blocker.h"
> > #include "qemu/xxhash.h"
> > #include <math.h>
> > +#ifdef CONFIG_WIN32
> > +#define UTIME_NOW ((1l << 30) - 1l)
> > +#define UTIME_OMIT ((1l << 30) - 2l)
> > +#endif
> >
> > int open_fd_hw;
> > int total_open_fd;
> > @@ -986,9 +990,11 @@ static int stat_to_qid(V9fsPDU *pdu, const struct stat
> > *stbuf, V9fsQID *qidp) if (S_ISDIR(stbuf->st_mode)) {
> > qidp->type |= P9_QID_TYPE_DIR;
> > }
> > +#ifndef CONFIG_WIN32
> > if (S_ISLNK(stbuf->st_mode)) {
> > qidp->type |= P9_QID_TYPE_SYMLINK;
> > }
> > +#endif
> >
> > return 0;
> > }
> > @@ -1095,6 +1101,7 @@ static mode_t v9mode_to_mode(uint32_t mode,
> V9fsString
> > *extension) ret |= S_IFDIR;
> > }
> >
> > +#ifndef CONFIG_WIN32
> > if (mode & P9_STAT_MODE_SYMLINK) {
> > ret |= S_IFLNK;
> > }
> > @@ -1104,6 +1111,7 @@ static mode_t v9mode_to_mode(uint32_t mode,
> V9fsString
> > *extension) if (mode & P9_STAT_MODE_NAMED_PIPE) {
> > ret |= S_IFIFO;
> > }
> > +#endif
> > if (mode & P9_STAT_MODE_DEVICE) {
> > if (extension->size && extension->data[0] == 'c') {
> > ret |= S_IFCHR;
> > @@ -1116,6 +1124,7 @@ static mode_t v9mode_to_mode(uint32_t mode,
> V9fsString
> > *extension) ret |= S_IFREG;
> > }
> >
> > +#ifndef CONFIG_WIN32
> > if (mode & P9_STAT_MODE_SETUID) {
> > ret |= S_ISUID;
> > }
> > @@ -1125,6 +1134,7 @@ static mode_t v9mode_to_mode(uint32_t mode,
> V9fsString
> > *extension) if (mode & P9_STAT_MODE_SETVTX) {
> > ret |= S_ISVTX;
> > }
> > +#endif
> >
> > return ret;
> > }
> > @@ -1180,6 +1190,7 @@ static uint32_t stat_to_v9mode(const struct stat
> > *stbuf) mode |= P9_STAT_MODE_DIR;
> > }
> >
> > +#ifndef CONFIG_WIN32
> > if (S_ISLNK(stbuf->st_mode)) {
> > mode |= P9_STAT_MODE_SYMLINK;
> > }
> > @@ -1191,11 +1202,13 @@ static uint32_t stat_to_v9mode(const struct stat
> > *stbuf) if (S_ISFIFO(stbuf->st_mode)) {
> > mode |= P9_STAT_MODE_NAMED_PIPE;
> > }
> > +#endif
> >
> > if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
> > mode |= P9_STAT_MODE_DEVICE;
> > }
> >
> > +#ifndef CONFIG_WIN32
> > if (stbuf->st_mode & S_ISUID) {
> > mode |= P9_STAT_MODE_SETUID;
> > }
> > @@ -1207,6 +1220,7 @@ static uint32_t stat_to_v9mode(const struct stat
> > *stbuf) if (stbuf->st_mode & S_ISVTX) {
> > mode |= P9_STAT_MODE_SETVTX;
> > }
> > +#endif
> >
> > return mode;
> > }
> > @@ -1245,9 +1259,16 @@ static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu,
> > V9fsPath *path, return err;
> > }
> > } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
> > +#ifndef CONFIG_WIN32
> > v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
> > S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
> > major(stbuf->st_rdev), minor(stbuf->st_rdev));
> > +#else
> > + v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
> > + S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
> > + 0, 0);
> > +#endif
> > +
> > } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
> > v9fs_string_sprintf(&v9stat->extension, "%s %lu",
> > "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
> > @@ -1315,7 +1336,11 @@ static int32_t blksize_to_iounit(const V9fsPDU *pdu,
> > int32_t blksize)
> >
> > static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf)
> > {
> > +#ifndef CONFIG_WIN32
> > return blksize_to_iounit(pdu, stbuf->st_blksize);
> > +#else
> > + return blksize_to_iounit(pdu, 0);
> > +#endif
> > }
> >
> > static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf,
> > @@ -1329,6 +1354,14 @@ static int stat_to_v9stat_dotl(V9fsPDU *pdu, const
> > struct stat *stbuf, v9lstat->st_gid = stbuf->st_gid;
> > v9lstat->st_rdev = stbuf->st_rdev;
> > v9lstat->st_size = stbuf->st_size;
> > +
> > +#ifdef CONFIG_WIN32
> > + v9lstat->st_blksize = stat_to_iounit(pdu, stbuf);
> > + v9lstat->st_blocks = 0;
> > + v9lstat->st_atime_sec = stbuf->st_atime;
> > + v9lstat->st_mtime_sec = stbuf->st_mtime;
> > + v9lstat->st_ctime_sec = stbuf->st_ctime;
> > +#else /* !CONFIG_WIN32 */
> > v9lstat->st_blksize = stat_to_iounit(pdu, stbuf);
> > v9lstat->st_blocks = stbuf->st_blocks;
> > v9lstat->st_atime_sec = stbuf->st_atime;
> > @@ -1343,6 +1376,8 @@ static int stat_to_v9stat_dotl(V9fsPDU *pdu, const
> > struct stat *stbuf, v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
> > v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
> > #endif
> > +#endif /* CONFIG_WIN32 */
> > +
> > /* Currently we only support BASIC fields in stat */
> > v9lstat->st_result_mask = P9_STATS_BASIC;
> >
> > @@ -1759,7 +1794,11 @@ static bool name_is_illegal(const char *name)
> >
> > static bool same_stat_id(const struct stat *a, const struct stat *b)
> > {
> > +#ifdef CONFIG_WIN32
> > + return 0;
> > +#else
> > return a->st_dev == b->st_dev && a->st_ino == b->st_ino;
> > +#endif /* CONFIG_WIN32 */
> > }
> >
> > static void coroutine_fn v9fs_walk(void *opaque)
> > @@ -2300,7 +2339,11 @@ static int coroutine_fn
> > v9fs_do_readdir_with_stat(V9fsPDU *pdu, count += len;
> > v9fs_stat_free(&v9stat);
> > v9fs_path_free(&path);
> > +#ifndef CONFIG_WIN32
> > saved_dir_pos = qemu_dirent_off(dent);
> > +#else
> > + saved_dir_pos = v9fs_co_telldir(pdu, fidp);
> > +#endif
> > }
> >
> > v9fs_readdir_unlock(&fidp->fs.dir);
> > @@ -2501,14 +2544,32 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU
> > *pdu, V9fsFidState *fidp, qid.version = 0;
> > }
> >
> > +#ifdef CONFIG_WIN32
> > + /*
> > + * Windows does not have dent->d_off, get offset by calling
> > telldir() + * manually.
> > + */
> > + off = v9fs_co_telldir(pdu, fidp);
> > +#else
> > off = qemu_dirent_off(dent);
> > +#endif
> > v9fs_string_init(&name);
> > v9fs_string_sprintf(&name, "%s", dent->d_name);
> >
> > +#ifdef CONFIG_WIN32
> > + /*
> > + * Windows does not have dent->d_type
> > + */
> > +
> > + len = pdu_marshal(pdu, 11 + count, "Qqbs",
> > + &qid, off,
> > + 0, &name);
> > +#else
> > /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
> > len = pdu_marshal(pdu, 11 + count, "Qqbs",
> > &qid, off,
> > dent->d_type, &name);
> > +#endif
> >
> > v9fs_string_free(&name);
> >
> > @@ -2838,8 +2899,14 @@ static void coroutine_fn v9fs_create(void *opaque)
> > }
> >
> > nmode |= perm & 0777;
> > +
> > +#ifndef CONFIG_WIN32
> > err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
> > makedev(major, minor), nmode, &stbuf);
> > +#else
> > + err = -ENOTSUP;
> > +#endif
> > +
> > if (err < 0) {
> > goto out;
> > }
> > @@ -2864,8 +2931,12 @@ static void coroutine_fn v9fs_create(void *opaque)
> > v9fs_path_copy(&fidp->path, &path);
> > v9fs_path_unlock(s);
> > } else if (perm & P9_STAT_MODE_SOCKET) {
> > +#ifndef CONFIG_WIN32
> > err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
> > 0, S_IFSOCK | (perm & 0777), &stbuf);
> > +#else
> > + err = -ENOTSUP;
> > +#endif
> > if (err < 0) {
> > goto out;
> > }
> > @@ -3600,6 +3671,7 @@ out_nofid:
> > static void coroutine_fn v9fs_mknod(void *opaque)
> > {
> >
> > +#ifndef CONFIG_WIN32
> > int mode;
> > gid_t gid;
> > int32_t fid;
> > @@ -3656,6 +3728,11 @@ out:
> > out_nofid:
> > pdu_complete(pdu, err);
> > v9fs_string_free(&name);
> > +#else
> > + V9fsPDU *pdu = opaque;
> > +
> > + pdu_complete(pdu, -1);
> > +#endif
> > }
> >
> > /*
> > @@ -3928,7 +4005,7 @@ out_nofid:
> > #if defined(CONFIG_LINUX)
> > /* Currently, only Linux has XATTR_SIZE_MAX */
> > #define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX
> > -#elif defined(CONFIG_DARWIN)
> > +#elif defined(CONFIG_DARWIN) || defined(CONFIG_WIN32)
> > /*
> > * Darwin doesn't seem to define a maximum xattr size in its user
> > * space header, so manually configure it across platforms as 64k.
> > @@ -3945,6 +4022,7 @@ out_nofid:
> >
> > static void coroutine_fn v9fs_xattrcreate(void *opaque)
> > {
> > +#ifndef CONFIG_WIN32
> > int flags, rflags = 0;
> > int32_t fid;
> > uint64_t size;
> > @@ -4006,10 +4084,15 @@ out_put_fid:
> > out_nofid:
> > pdu_complete(pdu, err);
> > v9fs_string_free(&name);
> > +#else
> > + V9fsPDU *pdu = opaque;
> > + pdu_complete(pdu, -1);
> > +#endif
> > }
> >
> > static void coroutine_fn v9fs_readlink(void *opaque)
> > {
> > +#ifndef CONFIG_WIN32
> > V9fsPDU *pdu = opaque;
> > size_t offset = 7;
> > V9fsString target;
> > @@ -4045,6 +4128,10 @@ out:
> > put_fid(pdu, fidp);
> > out_nofid:
> > pdu_complete(pdu, err);
> > +#else
> > + V9fsPDU *pdu = opaque;
> > + pdu_complete(pdu, -1);
> > +#endif
> > }
> >
> > static CoroutineEntry *pdu_co_handlers[] = {
> > @@ -4306,6 +4393,7 @@ void v9fs_reset(V9fsState *s)
> >
> > static void __attribute__((__constructor__)) v9fs_set_fd_limit(void)
> > {
> > +#ifndef CONFIG_WIN32
> > struct rlimit rlim;
> > if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
> > error_report("Failed to get the resource limit");
> > @@ -4313,4 +4401,5 @@ static void __attribute__((__constructor__))
> > v9fs_set_fd_limit(void) }
> > open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3);
> > open_fd_rc = rlim.rlim_cur / 2;
> > +#endif
> > }
> > diff --git a/hw/9pfs/codir.c b/hw/9pfs/codir.c
> > index 93ba44fb75..2fbe7b831b 100644
> > --- a/hw/9pfs/codir.c
> > +++ b/hw/9pfs/codir.c
> > @@ -78,6 +78,9 @@ static int do_readdir_many(V9fsPDU *pdu, V9fsFidState
> > *fidp, int len, err = 0;
> > int32_t size = 0;
> > off_t saved_dir_pos;
> > +#ifdef CONFIG_WIN32
> > + off_t next_dir_pos;
> > +#endif
> > struct dirent *dent;
> > struct V9fsDirEnt *e = NULL;
> > V9fsPath path;
> > @@ -124,6 +127,14 @@ static int do_readdir_many(V9fsPDU *pdu, V9fsFidState
> > *fidp, break;
> > }
> >
> > +#ifdef CONFIG_WIN32
> > + next_dir_pos = s->ops->telldir(&s->ctx, &fidp->fs);
> > + if (next_dir_pos < 0) {
> > + err = next_dir_pos;
> > + goto out;
> > + }
> > +#endif
> > +
> > /*
> > * stop this loop as soon as it would exceed the allowed maximum
> > * response message size for the directory entries collected so
> > far, @@ -168,7 +179,11 @@ static int do_readdir_many(V9fsPDU *pdu,
> > V9fsFidState *fidp, }
> >
> > size += len;
> > +#ifndef CONFIG_WIN32
> > saved_dir_pos = qemu_dirent_off(dent);
> > +#else
> > + saved_dir_pos = next_dir_pos;
> > +#endif
> > }
> >
> > /* restore (last) saved position */
>
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Christian Schoenebeck, 2022/05/04
- RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows,
Shi, Guohuai <=
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Greg Kurz, 2022/05/09
- RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Shi, Guohuai, 2022/05/09
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Greg Kurz, 2022/05/09
- RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Shi, Guohuai, 2022/05/09
- RE: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Shi, Guohuai, 2022/05/09
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Christian Schoenebeck, 2022/05/10
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Christian Schoenebeck, 2022/05/10
- Re: [PATCH 5/9] hw/9pfs: Add a 'local' file system backend driver for Windows, Greg Kurz, 2022/05/10