[PATCH 6.6 046/102] smb: client: move most of reparse point handling code to common file

Greg Kroah-Hartman
2024-05-23T13:24:31Z

From: Paulo Alcantara <pc@manguebit.com>

[ Upstream commit c520ba7573a84bd37f8803a3beeb8f6f995bf9e1 ]

In preparation to add support for creating special files also via WSL
reparse points in next commits.

Signed-off-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/smb/client/Makefile | 2 +-
fs/smb/client/cifsglob.h | 13 --
fs/smb/client/cifsproto.h | 4 -
fs/smb/client/inode.c | 79 +---------
fs/smb/client/readdir.c | 18 +--
fs/smb/client/reparse.c | 320 ++++++++++++++++++++++++++++++++++++++
fs/smb/client/reparse.h | 73 +++++++++
fs/smb/client/smb2ops.c | 254 +-----------------------------
fs/smb/client/smb2proto.h | 6 +
9 files changed, 405 insertions(+), 364 deletions(-)
create mode 100644 fs/smb/client/reparse.c
create mode 100644 fs/smb/client/reparse.h

diff --git a/fs/smb/client/Makefile b/fs/smb/client/Makefile
index 0b07eb94c93b3..e11985f2460b2 100644
--- a/fs/smb/client/Makefile
+++ b/fs/smb/client/Makefile
@@ -12,7 +12,7 @@ cifs-y := trace.o cifsfs.o cifs_debug.o connect.o dir.o file.o \
smb2ops.o smb2maperror.o smb2transport.o \
smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \
dns_resolve.o cifs_spnego_negtokeninit.asn1.o asn1.o \
- namespace.o
+ namespace.o reparse.o

$(obj)/asn1.o: $(obj)/cifs_spnego_negtokeninit.asn1.h

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 08540541046c1..296ed556be0e2 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -223,19 +223,6 @@ struct cifs_open_info_data {
};
};

-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;
-}
-
/*
*****************************************************************
* Except the CIFS PDUs themselves all the
diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h
index 50040990e70b9..8e0a348f1f660 100644
--- a/fs/smb/client/cifsproto.h
+++ b/fs/smb/client/cifsproto.h
@@ -210,10 +210,6 @@ extern struct inode *cifs_iget(struct super_block *sb,
int cifs_get_inode_info(struct inode **inode, const char *full_path,
struct cifs_open_info_data *data, struct super_block *sb, int xid,
const struct cifs_fid *fid);
-bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
- struct cifs_fattr *fattr,
- struct cifs_open_info_data *data);
-
extern int smb311_posix_get_inode_info(struct inode **inode,
const char *full_path,
struct cifs_open_info_data *data,
diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index 2739cb8390804..8aff8382cfb54 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -26,6 +26,7 @@
#include "fs_context.h"
#include "cifs_ioctl.h"
#include "cached_dir.h"
+#include "reparse.h"

static void cifs_set_ops(struct inode *inode)
{
@@ -728,84 +729,6 @@ static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
}

-static inline dev_t nfs_mkdev(struct reparse_posix_data *buf)
-{
- u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer);
-
- return MKDEV(v >> 32, v & 0xffffffff);
-}
-
-bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
- struct cifs_fattr *fattr,
- struct cifs_open_info_data *data)
-{
- struct reparse_posix_data *buf = data->reparse.posix;
- u32 tag = data->reparse.tag;
-
- if (tag == IO_REPARSE_TAG_NFS && buf) {
- switch (le64_to_cpu(buf->InodeType)) {
- case NFS_SPECFILE_CHR:
- fattr->cf_mode |= S_IFCHR;
- fattr->cf_dtype = DT_CHR;
- fattr->cf_rdev = nfs_mkdev(buf);
- break;
- case NFS_SPECFILE_BLK:
- fattr->cf_mode |= S_IFBLK;
- fattr->cf_dtype = DT_BLK;
- fattr->cf_rdev = nfs_mkdev(buf);
- break;
- case NFS_SPECFILE_FIFO:
- fattr->cf_mode |= S_IFIFO;
- fattr->cf_dtype = DT_FIFO;
- break;
- case NFS_SPECFILE_SOCK:
- fattr->cf_mode |= S_IFSOCK;
- fattr->cf_dtype = DT_SOCK;
- break;
- case NFS_SPECFILE_LNK:
- fattr->cf_mode |= S_IFLNK;
- fattr->cf_dtype = DT_LNK;
- break;
- default:
- WARN_ON_ONCE(1);
- return false;
- }
- return true;
- }
-
- switch (tag) {
- case IO_REPARSE_TAG_LX_SYMLINK:
- fattr->cf_mode |= S_IFLNK;
- fattr->cf_dtype = DT_LNK;
- break;
- case IO_REPARSE_TAG_LX_FIFO:
- fattr->cf_mode |= S_IFIFO;
- fattr->cf_dtype = DT_FIFO;
- break;
- case IO_REPARSE_TAG_AF_UNIX:
- fattr->cf_mode |= S_IFSOCK;
- fattr->cf_dtype = DT_SOCK;
- break;
- case IO_REPARSE_TAG_LX_CHR:
- fattr->cf_mode |= S_IFCHR;
- fattr->cf_dtype = DT_CHR;
- break;
- case IO_REPARSE_TAG_LX_BLK:
- fattr->cf_mode |= S_IFBLK;
- fattr->cf_dtype = DT_BLK;
- break;
- case 0: /* SMB1 symlink */
- case IO_REPARSE_TAG_SYMLINK:
- case IO_REPARSE_TAG_NFS:
- fattr->cf_mode |= S_IFLNK;
- fattr->cf_dtype = DT_LNK;
- break;
- default:
- return false;
- }
- return true;
-}
-
static void cifs_open_info_to_fattr(struct cifs_fattr *fattr,
struct cifs_open_info_data *data,
struct super_block *sb)
diff --git a/fs/smb/client/readdir.c b/fs/smb/client/readdir.c
index 73ff9bd059682..3e5d22b356e92 100644
--- a/fs/smb/client/readdir.c
+++ b/fs/smb/client/readdir.c
@@ -22,6 +22,7 @@
#include "smb2proto.h"
#include "fs_context.h"
#include "cached_dir.h"
+#include "reparse.h"

/*
* To be safe - for UCS to UTF-8 with strings loaded with the rare long
@@ -55,23 +56,6 @@ static inline void dump_cifs_file_struct(struct file *file, char *label)
}
#endif /* DEBUG2 */

-/*
- * 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);
-}
-
/*
* Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
*
diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
new file mode 100644
index 0000000000000..c405be47c84d9
--- /dev/null
+++ b/fs/smb/client/reparse.c
@@ -0,0 +1,320 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 Paulo Alcantara <pc@manguebit.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include "cifsglob.h"
+#include "smb2proto.h"
+#include "cifsproto.h"
+#include "cifs_unicode.h"
+#include "cifs_debug.h"
+#include "reparse.h"
+
+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)
+{
+ struct reparse_symlink_data_buffer *buf = NULL;
+ struct cifs_open_info_data data;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct inode *new;
+ struct kvec iov;
+ __le16 *path;
+ char *sym, sep = CIFS_DIR_SEP(cifs_sb);
+ u16 len, plen;
+ int rc = 0;
+
+ sym = kstrdup(symname, GFP_KERNEL);
+ if (!sym)
+ return -ENOMEM;
+
+ data = (struct cifs_open_info_data) {
+ .reparse_point = true,
+ .reparse = { .tag = IO_REPARSE_TAG_SYMLINK, },
+ .symlink_target = sym,
+ };
+
+ convert_delimiter(sym, sep);
+ path = cifs_convert_path_to_utf16(sym, cifs_sb);
+ if (!path) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ plen = 2 * UniStrnlen((wchar_t *)path, PATH_MAX);
+ len = sizeof(*buf) + plen * 2;
+ buf = kzalloc(len, GFP_KERNEL);
+ if (!buf) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_SYMLINK);
+ buf->ReparseDataLength = cpu_to_le16(len - sizeof(struct reparse_data_buffer));
+ buf->SubstituteNameOffset = cpu_to_le16(plen);
+ buf->SubstituteNameLength = cpu_to_le16(plen);
+ memcpy(&buf->PathBuffer[plen], path, plen);
+ buf->PrintNameOffset = 0;
+ buf->PrintNameLength = cpu_to_le16(plen);
+ memcpy(buf->PathBuffer, path, plen);
+ buf->Flags = cpu_to_le32(*symname != '/' ? SYMLINK_FLAG_RELATIVE : 0);
+ if (*sym != sep)
+ buf->Flags = cpu_to_le32(SYMLINK_FLAG_RELATIVE);
+
+ convert_delimiter(sym, '/');
+ iov.iov_base = buf;
+ iov.iov_len = len;
+ new = smb2_get_reparse_inode(&data, inode->i_sb, xid,
+ tcon, full_path, &iov);
+ if (!IS_ERR(new))
+ d_instantiate(dentry, new);
+ else
+ rc = PTR_ERR(new);
+out:
+ kfree(path);
+ cifs_free_open_info(&data);
+ kfree(buf);
+ return rc;
+}
+
+static int nfs_set_reparse_buf(struct reparse_posix_data *buf,
+ mode_t mode, dev_t dev,
+ struct kvec *iov)
+{
+ u64 type;
+ u16 len, dlen;
+
+ len = sizeof(*buf);
+
+ switch ((type = reparse_mode_nfs_type(mode))) {
+ case NFS_SPECFILE_BLK:
+ case NFS_SPECFILE_CHR:
+ dlen = sizeof(__le64);
+ break;
+ case NFS_SPECFILE_FIFO:
+ case NFS_SPECFILE_SOCK:
+ dlen = 0;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_NFS);
+ buf->Reserved = 0;
+ buf->InodeType = cpu_to_le64(type);
+ buf->ReparseDataLength = cpu_to_le16(len + dlen -
+ sizeof(struct reparse_data_buffer));
+ *(__le64 *)buf->DataBuffer = cpu_to_le64(((u64)MAJOR(dev) << 32) |
+ MINOR(dev));
+ iov->iov_base = buf;
+ iov->iov_len = len + dlen;
+ return 0;
+}
+
+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)
+{
+ struct cifs_open_info_data data;
+ struct reparse_posix_data *p;
+ struct inode *new;
+ struct kvec iov;
+ __u8 buf[sizeof(*p) + sizeof(__le64)];
+ int rc;
+
+ p = (struct reparse_posix_data *)buf;
+ rc = nfs_set_reparse_buf(p, mode, dev, &iov);
+ if (rc)
+ return rc;
+
+ data = (struct cifs_open_info_data) {
+ .reparse_point = true,
+ .reparse = { .tag = IO_REPARSE_TAG_NFS, .posix = p, },
+ };
+
+ new = smb2_get_reparse_inode(&data, inode->i_sb, xid,
+ tcon, full_path, &iov);
+ if (!IS_ERR(new))
+ d_instantiate(dentry, new);
+ else
+ rc = PTR_ERR(new);
+ cifs_free_open_info(&data);
+ return rc;
+}
+
+/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
+static int parse_reparse_posix(struct reparse_posix_data *buf,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_open_info_data *data)
+{
+ unsigned int len;
+ u64 type;
+
+ switch ((type = le64_to_cpu(buf->InodeType))) {
+ case NFS_SPECFILE_LNK:
+ len = le16_to_cpu(buf->ReparseDataLength);
+ data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer,
+ len, true,
+ cifs_sb->local_nls);
+ if (!data->symlink_target)
+ return -ENOMEM;
+ convert_delimiter(data->symlink_target, '/');
+ cifs_dbg(FYI, "%s: target path: %s\n",
+ __func__, data->symlink_target);
+ break;
+ case NFS_SPECFILE_CHR:
+ case NFS_SPECFILE_BLK:
+ case NFS_SPECFILE_FIFO:
+ case NFS_SPECFILE_SOCK:
+ break;
+ default:
+ cifs_dbg(VFS, "%s: unhandled inode type: 0x%llx\n",
+ __func__, type);
+ return -EOPNOTSUPP;
+ }
+ return 0;
+}
+
+static int parse_reparse_symlink(struct reparse_symlink_data_buffer *sym,
+ u32 plen, bool unicode,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_open_info_data *data)
+{
+ unsigned int len;
+ unsigned int offs;
+
+ /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
+
+ offs = le16_to_cpu(sym->SubstituteNameOffset);
+ len = le16_to_cpu(sym->SubstituteNameLength);
+ if (offs + 20 > plen || offs + len + 20 > plen) {
+ cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
+ return -EIO;
+ }
+
+ data->symlink_target = cifs_strndup_from_utf16(sym->PathBuffer + offs,
+ len, unicode,
+ cifs_sb->local_nls);
+ if (!data->symlink_target)
+ return -ENOMEM;
+
+ convert_delimiter(data->symlink_target, '/');
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, data->symlink_target);
+
+ return 0;
+}
+
+int parse_reparse_point(struct reparse_data_buffer *buf,
+ u32 plen, struct cifs_sb_info *cifs_sb,
+ bool unicode, struct cifs_open_info_data *data)
+{
+ data->reparse.buf = buf;
+
+ /* See MS-FSCC 2.1.2 */
+ switch (le32_to_cpu(buf->ReparseTag)) {
+ case IO_REPARSE_TAG_NFS:
+ return parse_reparse_posix((struct reparse_posix_data *)buf,
+ cifs_sb, data);
+ case IO_REPARSE_TAG_SYMLINK:
+ return parse_reparse_symlink(
+ (struct reparse_symlink_data_buffer *)buf,
+ plen, unicode, cifs_sb, data);
+ case IO_REPARSE_TAG_LX_SYMLINK:
+ case IO_REPARSE_TAG_AF_UNIX:
+ case IO_REPARSE_TAG_LX_FIFO:
+ case IO_REPARSE_TAG_LX_CHR:
+ case IO_REPARSE_TAG_LX_BLK:
+ return 0;
+ default:
+ cifs_dbg(VFS, "%s: unhandled reparse tag: 0x%08x\n",
+ __func__, le32_to_cpu(buf->ReparseTag));
+ return -EOPNOTSUPP;
+ }
+}
+
+int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb,
+ struct kvec *rsp_iov,
+ struct cifs_open_info_data *data)
+{
+ struct reparse_data_buffer *buf;
+ struct smb2_ioctl_rsp *io = rsp_iov->iov_base;
+ u32 plen = le32_to_cpu(io->OutputCount);
+
+ buf = (struct reparse_data_buffer *)((u8 *)io +
+ le32_to_cpu(io->OutputOffset));
+ return parse_reparse_point(buf, plen, cifs_sb, true, data);
+}
+
+bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
+ struct cifs_fattr *fattr,
+ struct cifs_open_info_data *data)
+{
+ struct reparse_posix_data *buf = data->reparse.posix;
+ u32 tag = data->reparse.tag;
+
+ if (tag == IO_REPARSE_TAG_NFS && buf) {
+ switch (le64_to_cpu(buf->InodeType)) {
+ case NFS_SPECFILE_CHR:
+ fattr->cf_mode |= S_IFCHR;
+ fattr->cf_dtype = DT_CHR;
+ fattr->cf_rdev = reparse_nfs_mkdev(buf);
+ break;
+ case NFS_SPECFILE_BLK:
+ fattr->cf_mode |= S_IFBLK;
+ fattr->cf_dtype = DT_BLK;
+ fattr->cf_rdev = reparse_nfs_mkdev(buf);
+ break;
+ case NFS_SPECFILE_FIFO:
+ fattr->cf_mode |= S_IFIFO;
+ fattr->cf_dtype = DT_FIFO;
+ break;
+ case NFS_SPECFILE_SOCK:
+ fattr->cf_mode |= S_IFSOCK;
+ fattr->cf_dtype = DT_SOCK;
+ break;
+ case NFS_SPECFILE_LNK:
+ fattr->cf_mode |= S_IFLNK;
+ fattr->cf_dtype = DT_LNK;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+ return true;
+ }
+
+ switch (tag) {
+ case IO_REPARSE_TAG_LX_SYMLINK:
+ fattr->cf_mode |= S_IFLNK;
+ fattr->cf_dtype = DT_LNK;
+ break;
+ case IO_REPARSE_TAG_LX_FIFO:
+ fattr->cf_mode |= S_IFIFO;
+ fattr->cf_dtype = DT_FIFO;
+ break;
+ case IO_REPARSE_TAG_AF_UNIX:
+ fattr->cf_mode |= S_IFSOCK;
+ fattr->cf_dtype = DT_SOCK;
+ break;
+ case IO_REPARSE_TAG_LX_CHR:
+ fattr->cf_mode |= S_IFCHR;
+ fattr->cf_dtype = DT_CHR;
+ break;
+ case IO_REPARSE_TAG_LX_BLK:
+ fattr->cf_mode |= S_IFBLK;
+ fattr->cf_dtype = DT_BLK;
+ break;
+ case 0: /* SMB1 symlink */
+ case IO_REPARSE_TAG_SYMLINK:
+ case IO_REPARSE_TAG_NFS:
+ fattr->cf_mode |= S_IFLNK;
+ fattr->cf_dtype = DT_LNK;
+ break;
+ default:
+ return false;
+ }
+ return true;
+}
diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h
new file mode 100644
index 0000000000000..3ceb90da0df90
--- /dev/null
+++ b/fs/smb/client/reparse.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2024 Paulo Alcantara <pc@manguebit.com>
+ */
+
+#ifndef _CIFS_REPARSE_H
+#define _CIFS_REPARSE_H
+
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include "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 */
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 9ade347978709..2c59a6fc2d7c7 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -28,6 +28,7 @@
#include "fscache.h"
#include "fs_context.h"
#include "cached_dir.h"
+#include "reparse.h"

/* Change credits for different ops and return the total number of credits */
static int
@@ -2989,109 +2990,6 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
return rc;
}

-/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
-static int parse_reparse_posix(struct reparse_posix_data *buf,
- struct cifs_sb_info *cifs_sb,
- struct cifs_open_info_data *data)
-{
- unsigned int len;
- u64 type;
-
- switch ((type = le64_to_cpu(buf->InodeType))) {
- case NFS_SPECFILE_LNK:
- len = le16_to_cpu(buf->ReparseDataLength);
- data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer,
- len, true,
- cifs_sb->local_nls);
- if (!data->symlink_target)
- return -ENOMEM;
- convert_delimiter(data->symlink_target, '/');
- cifs_dbg(FYI, "%s: target path: %s\n",
- __func__, data->symlink_target);
- break;
- case NFS_SPECFILE_CHR:
- case NFS_SPECFILE_BLK:
- case NFS_SPECFILE_FIFO:
- case NFS_SPECFILE_SOCK:
- break;
- default:
- cifs_dbg(VFS, "%s: unhandled inode type: 0x%llx\n",
- __func__, type);
- return -EOPNOTSUPP;
- }
- return 0;
-}
-
-static int parse_reparse_symlink(struct reparse_symlink_data_buffer *sym,
- u32 plen, bool unicode,
- struct cifs_sb_info *cifs_sb,
- struct cifs_open_info_data *data)
-{
- unsigned int len;
- unsigned int offs;
-
- /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
-
- offs = le16_to_cpu(sym->SubstituteNameOffset);
- len = le16_to_cpu(sym->SubstituteNameLength);
- if (offs + 20 > plen || offs + len + 20 > plen) {
- cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
- return -EIO;
- }
-
- data->symlink_target = cifs_strndup_from_utf16(sym->PathBuffer + offs,
- len, unicode,
- cifs_sb->local_nls);
- if (!data->symlink_target)
- return -ENOMEM;
-
- convert_delimiter(data->symlink_target, '/');
- cifs_dbg(FYI, "%s: target path: %s\n", __func__, data->symlink_target);
-
- return 0;
-}
-
-int parse_reparse_point(struct reparse_data_buffer *buf,
- u32 plen, struct cifs_sb_info *cifs_sb,
- bool unicode, struct cifs_open_info_data *data)
-{
- data->reparse.buf = buf;
-
- /* See MS-FSCC 2.1.2 */
- switch (le32_to_cpu(buf->ReparseTag)) {
- case IO_REPARSE_TAG_NFS:
- return parse_reparse_posix((struct reparse_posix_data *)buf,
- cifs_sb, data);
- case IO_REPARSE_TAG_SYMLINK:
- return parse_reparse_symlink(
- (struct reparse_symlink_data_buffer *)buf,
- plen, unicode, cifs_sb, data);
- case IO_REPARSE_TAG_LX_SYMLINK:
- case IO_REPARSE_TAG_AF_UNIX:
- case IO_REPARSE_TAG_LX_FIFO:
- case IO_REPARSE_TAG_LX_CHR:
- case IO_REPARSE_TAG_LX_BLK:
- return 0;
- default:
- cifs_dbg(VFS, "%s: unhandled reparse tag: 0x%08x\n",
- __func__, le32_to_cpu(buf->ReparseTag));
- return -EOPNOTSUPP;
- }
-}
-
-static int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb,
- struct kvec *rsp_iov,
- struct cifs_open_info_data *data)
-{
- struct reparse_data_buffer *buf;
- struct smb2_ioctl_rsp *io = rsp_iov->iov_base;
- u32 plen = le32_to_cpu(io->OutputCount);
-
- buf = (struct reparse_data_buffer *)((u8 *)io +
- le32_to_cpu(io->OutputOffset));
- return parse_reparse_point(buf, plen, cifs_sb, true, data);
-}
-
static struct cifs_ntsd *
get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
const struct cifs_fid *cifsfid, u32 *pacllen, u32 info)
@@ -5123,152 +5021,6 @@ int cifs_sfu_make_node(unsigned int xid, struct inode *inode,
return rc;
}

-static inline u64 mode_nfs_type(mode_t mode)
-{
- switch (mode & S_IFMT) {
- case S_IFBLK: return NFS_SPECFILE_BLK;
- case S_IFCHR: return NFS_SPECFILE_CHR;
- case S_IFIFO: return NFS_SPECFILE_FIFO;
- case S_IFSOCK: return NFS_SPECFILE_SOCK;
- }
- return 0;
-}
-
-static int nfs_set_reparse_buf(struct reparse_posix_data *buf,
- mode_t mode, dev_t dev,
- struct kvec *iov)
-{
- u64 type;
- u16 len, dlen;
-
- len = sizeof(*buf);
-
- switch ((type = mode_nfs_type(mode))) {
- case NFS_SPECFILE_BLK:
- case NFS_SPECFILE_CHR:
- dlen = sizeof(__le64);
- break;
- case NFS_SPECFILE_FIFO:
- case NFS_SPECFILE_SOCK:
- dlen = 0;
- break;
- default:
- return -EOPNOTSUPP;
- }
-
- buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_NFS);
- buf->Reserved = 0;
- buf->InodeType = cpu_to_le64(type);
- buf->ReparseDataLength = cpu_to_le16(len + dlen -
- sizeof(struct reparse_data_buffer));
- *(__le64 *)buf->DataBuffer = cpu_to_le64(((u64)MAJOR(dev) << 32) |
- MINOR(dev));
- iov->iov_base = buf;
- iov->iov_len = len + dlen;
- return 0;
-}
-
-static int nfs_make_node(unsigned int xid, struct inode *inode,
- struct dentry *dentry, struct cifs_tcon *tcon,
- const char *full_path, umode_t mode, dev_t dev)
-{
- struct cifs_open_info_data data;
- struct reparse_posix_data *p;
- struct inode *new;
- struct kvec iov;
- __u8 buf[sizeof(*p) + sizeof(__le64)];
- int rc;
-
- p = (struct reparse_posix_data *)buf;
- rc = nfs_set_reparse_buf(p, mode, dev, &iov);
- if (rc)
- return rc;
-
- data = (struct cifs_open_info_data) {
- .reparse_point = true,
- .reparse = { .tag = IO_REPARSE_TAG_NFS, .posix = p, },
- };
-
- new = smb2_get_reparse_inode(&data, inode->i_sb, xid,
- tcon, full_path, &iov);
- if (!IS_ERR(new))
- d_instantiate(dentry, new);
- else
- rc = PTR_ERR(new);
- cifs_free_open_info(&data);
- return rc;
-}
-
-static 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)
-{
- struct reparse_symlink_data_buffer *buf = NULL;
- struct cifs_open_info_data data;
- struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
- struct inode *new;
- struct kvec iov;
- __le16 *path;
- char *sym, sep = CIFS_DIR_SEP(cifs_sb);
- u16 len, plen;
- int rc = 0;
-
- sym = kstrdup(symname, GFP_KERNEL);
- if (!sym)
- return -ENOMEM;
-
- data = (struct cifs_open_info_data) {
- .reparse_point = true,
- .reparse = { .tag = IO_REPARSE_TAG_SYMLINK, },
- .symlink_target = sym,
- };
-
- convert_delimiter(sym, sep);
- path = cifs_convert_path_to_utf16(sym, cifs_sb);
- if (!path) {
- rc = -ENOMEM;
- goto out;
- }
-
- plen = 2 * UniStrnlen((wchar_t *)path, PATH_MAX);
- len = sizeof(*buf) + plen * 2;
- buf = kzalloc(len, GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
-
- buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_SYMLINK);
- buf->ReparseDataLength = cpu_to_le16(len - sizeof(struct reparse_data_buffer));
- buf->SubstituteNameOffset = cpu_to_le16(plen);
- buf->SubstituteNameLength = cpu_to_le16(plen);
- memcpy(&buf->PathBuffer[plen], path, plen);
- buf->PrintNameOffset = 0;
- buf->PrintNameLength = cpu_to_le16(plen);
- memcpy(buf->PathBuffer, path, plen);
- buf->Flags = cpu_to_le32(*symname != '/' ? SYMLINK_FLAG_RELATIVE : 0);
- if (*sym != sep)
- buf->Flags = cpu_to_le32(SYMLINK_FLAG_RELATIVE);
-
- convert_delimiter(sym, '/');
- iov.iov_base = buf;
- iov.iov_len = len;
- new = smb2_get_reparse_inode(&data, inode->i_sb, xid,
- tcon, full_path, &iov);
- if (!IS_ERR(new))
- d_instantiate(dentry, new);
- else
- rc = PTR_ERR(new);
-out:
- kfree(path);
- cifs_free_open_info(&data);
- kfree(buf);
- return rc;
-}
-
static int smb2_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
const char *full_path, umode_t mode, dev_t dev)
@@ -5286,8 +5038,8 @@ static int smb2_make_node(unsigned int xid, struct inode *inode,
rc = cifs_sfu_make_node(xid, inode, dentry, tcon,
full_path, mode, dev);
} else {
- rc = nfs_make_node(xid, inode, dentry, tcon,
- full_path, mode, dev);
+ rc = smb2_make_nfs_node(xid, inode, dentry, tcon,
+ full_path, mode, dev);
}
return rc;
}
diff --git a/fs/smb/client/smb2proto.h b/fs/smb/client/smb2proto.h
index 221143788a1c0..64a0ef0409a6e 100644
--- a/fs/smb/client/smb2proto.h
+++ b/fs/smb/client/smb2proto.h
@@ -310,5 +310,11 @@ int smb311_posix_query_path_info(const unsigned int xid,
int posix_info_parse(const void *beg, const void *end,
struct smb2_posix_info_parsed *out);
int posix_info_sid_size(const void *beg, const void *end);
+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);

#endif /* _SMB2PROTO_H */
--
2.43.0