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-rw-r--r--fs/smb/client/cifsfs.c2
-rw-r--r--fs/smb/client/cifsglob.h33
-rw-r--r--fs/smb/client/connect.c2
-rw-r--r--fs/smb/client/fs_context.c71
-rw-r--r--fs/smb/client/fs_context.h16
-rw-r--r--fs/smb/client/link.c60
-rw-r--r--fs/smb/client/reparse.c52
-rw-r--r--fs/smb/client/reparse.h2
8 files changed, 214 insertions, 24 deletions
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index b800c9f585d8..f2c852c9d6a1 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -715,6 +715,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
cifs_sb->ctx->backupgid));
seq_show_option(s, "reparse",
cifs_reparse_type_str(cifs_sb->ctx->reparse_type));
+ seq_show_option(s, "symlink",
+ cifs_symlink_type_str(get_cifs_symlink_type(cifs_sb)));
seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 2266b5b9a19f..9a96f69e67d0 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -177,6 +177,39 @@ static inline const char *cifs_reparse_type_str(enum cifs_reparse_type type)
}
}
+enum cifs_symlink_type {
+ CIFS_SYMLINK_TYPE_DEFAULT,
+ CIFS_SYMLINK_TYPE_NONE,
+ CIFS_SYMLINK_TYPE_NATIVE,
+ CIFS_SYMLINK_TYPE_UNIX,
+ CIFS_SYMLINK_TYPE_MFSYMLINKS,
+ CIFS_SYMLINK_TYPE_SFU,
+ CIFS_SYMLINK_TYPE_NFS,
+ CIFS_SYMLINK_TYPE_WSL,
+};
+
+static inline const char *cifs_symlink_type_str(enum cifs_symlink_type type)
+{
+ switch (type) {
+ case CIFS_SYMLINK_TYPE_NONE:
+ return "none";
+ case CIFS_SYMLINK_TYPE_NATIVE:
+ return "native";
+ case CIFS_SYMLINK_TYPE_UNIX:
+ return "unix";
+ case CIFS_SYMLINK_TYPE_MFSYMLINKS:
+ return "mfsymlinks";
+ case CIFS_SYMLINK_TYPE_SFU:
+ return "sfu";
+ case CIFS_SYMLINK_TYPE_NFS:
+ return "nfs";
+ case CIFS_SYMLINK_TYPE_WSL:
+ return "wsl";
+ default:
+ return "unknown";
+ }
+}
+
struct session_key {
unsigned int len;
char *response;
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 880d7cf8b730..ebd20f48f6aa 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -2849,6 +2849,8 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
return 0;
if (old->ctx->reparse_type != new->ctx->reparse_type)
return 0;
+ if (old->ctx->symlink_type != new->ctx->symlink_type)
+ return 0;
return 1;
}
diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index d7d2f6c607b5..5a9a5e04fb05 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -185,6 +185,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
fsparam_string("cache", Opt_cache),
fsparam_string("reparse", Opt_reparse),
fsparam_string("upcall_target", Opt_upcalltarget),
+ fsparam_string("symlink", Opt_symlink),
fsparam_string("symlinkroot", Opt_symlinkroot),
/* Arguments that should be ignored */
@@ -360,6 +361,55 @@ static int parse_reparse_flavor(struct fs_context *fc, char *value,
return 0;
}
+static const match_table_t symlink_flavor_tokens = {
+ { Opt_symlink_default, "default" },
+ { Opt_symlink_none, "none" },
+ { Opt_symlink_native, "native" },
+ { Opt_symlink_unix, "unix" },
+ { Opt_symlink_mfsymlinks, "mfsymlinks" },
+ { Opt_symlink_sfu, "sfu" },
+ { Opt_symlink_nfs, "nfs" },
+ { Opt_symlink_wsl, "wsl" },
+ { Opt_symlink_err, NULL },
+};
+
+static int parse_symlink_flavor(struct fs_context *fc, char *value,
+ struct smb3_fs_context *ctx)
+{
+ substring_t args[MAX_OPT_ARGS];
+
+ switch (match_token(value, symlink_flavor_tokens, args)) {
+ case Opt_symlink_default:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_DEFAULT;
+ break;
+ case Opt_symlink_none:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_NONE;
+ break;
+ case Opt_symlink_native:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_NATIVE;
+ break;
+ case Opt_symlink_unix:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_UNIX;
+ break;
+ case Opt_symlink_mfsymlinks:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_MFSYMLINKS;
+ break;
+ case Opt_symlink_sfu:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_SFU;
+ break;
+ case Opt_symlink_nfs:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_NFS;
+ break;
+ case Opt_symlink_wsl:
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_WSL;
+ break;
+ default:
+ cifs_errorf(fc, "bad symlink= option: %s\n", value);
+ return 1;
+ }
+ return 0;
+}
+
#define DUP_CTX_STR(field) \
do { \
if (ctx->field) { \
@@ -1730,6 +1780,10 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
if (parse_reparse_flavor(fc, param->string, ctx))
goto cifs_parse_mount_err;
break;
+ case Opt_symlink:
+ if (parse_symlink_flavor(fc, param->string, ctx))
+ goto cifs_parse_mount_err;
+ break;
case Opt_symlinkroot:
if (param->string[0] != '/') {
cifs_errorf(fc, "symlinkroot mount options must be absolute path\n");
@@ -1765,6 +1819,22 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
return -EINVAL;
}
+enum cifs_symlink_type get_cifs_symlink_type(struct cifs_sb_info *cifs_sb)
+{
+ if (cifs_sb->ctx->symlink_type == CIFS_SYMLINK_TYPE_DEFAULT) {
+ if (cifs_sb->ctx->mfsymlinks)
+ return CIFS_SYMLINK_TYPE_MFSYMLINKS;
+ else if (cifs_sb->ctx->sfu_emul)
+ return CIFS_SYMLINK_TYPE_SFU;
+ else if (cifs_sb->ctx->linux_ext && !cifs_sb->ctx->no_linux_ext)
+ return CIFS_SYMLINK_TYPE_UNIX;
+ else
+ return CIFS_SYMLINK_TYPE_NATIVE;
+ } else {
+ return cifs_sb->ctx->symlink_type;
+ }
+}
+
int smb3_init_fs_context(struct fs_context *fc)
{
struct smb3_fs_context *ctx;
@@ -1841,6 +1911,7 @@ int smb3_init_fs_context(struct fs_context *fc)
ctx->retrans = 1;
ctx->reparse_type = CIFS_REPARSE_TYPE_DEFAULT;
+ ctx->symlink_type = CIFS_SYMLINK_TYPE_DEFAULT;
/*
* short int override_uid = -1;
diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h
index 43bc3119af21..204643428068 100644
--- a/fs/smb/client/fs_context.h
+++ b/fs/smb/client/fs_context.h
@@ -48,6 +48,18 @@ enum cifs_reparse_parm {
Opt_reparse_err
};
+enum cifs_symlink_parm {
+ Opt_symlink_default,
+ Opt_symlink_none,
+ Opt_symlink_native,
+ Opt_symlink_unix,
+ Opt_symlink_mfsymlinks,
+ Opt_symlink_sfu,
+ Opt_symlink_nfs,
+ Opt_symlink_wsl,
+ Opt_symlink_err
+};
+
enum cifs_sec_param {
Opt_sec_krb5,
Opt_sec_krb5i,
@@ -166,6 +178,7 @@ enum cifs_param {
Opt_cache,
Opt_reparse,
Opt_upcalltarget,
+ Opt_symlink,
Opt_symlinkroot,
/* Mount options to be ignored */
@@ -295,6 +308,7 @@ struct smb3_fs_context {
struct cifs_ses *dfs_root_ses;
bool dfs_automount:1; /* set for dfs automount only */
enum cifs_reparse_type reparse_type;
+ enum cifs_symlink_type symlink_type;
bool dfs_conn:1; /* set for dfs mounts */
char *dns_dom;
char *symlinkroot; /* top level directory for native SMB symlinks in absolute format */
@@ -302,6 +316,8 @@ struct smb3_fs_context {
extern const struct fs_parameter_spec smb3_fs_parameters[];
+extern enum cifs_symlink_type get_cifs_symlink_type(struct cifs_sb_info *cifs_sb);
+
extern int smb3_init_fs_context(struct fs_context *fc);
extern void smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx);
extern void smb3_cleanup_fs_context(struct smb3_fs_context *ctx);
diff --git a/fs/smb/client/link.c b/fs/smb/client/link.c
index 47ddeb7fa111..6e6c09cc5ce7 100644
--- a/fs/smb/client/link.c
+++ b/fs/smb/client/link.c
@@ -18,6 +18,7 @@
#include "cifs_unicode.h"
#include "smb2proto.h"
#include "cifs_ioctl.h"
+#include "fs_context.h"
/*
* M-F Symlink Functions - Begin
@@ -604,22 +605,53 @@ cifs_symlink(struct mnt_idmap *idmap, struct inode *inode,
cifs_dbg(FYI, "symname is %s\n", symname);
/* BB what if DFS and this volume is on different share? BB */
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
- } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
- rc = __cifs_sfu_make_node(xid, inode, direntry, pTcon,
- full_path, S_IFLNK, 0, symname);
+ rc = -EOPNOTSUPP;
+ switch (get_cifs_symlink_type(cifs_sb)) {
+ case CIFS_SYMLINK_TYPE_DEFAULT:
+ /* should not happen, get_cifs_symlink_type() resolves the default */
+ break;
+
+ case CIFS_SYMLINK_TYPE_NONE:
+ break;
+
+ case CIFS_SYMLINK_TYPE_UNIX:
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
- } else if (pTcon->unix_ext) {
- rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
- cifs_sb->local_nls,
- cifs_remap(cifs_sb));
+ if (pTcon->unix_ext) {
+ rc = CIFSUnixCreateSymLink(xid, pTcon, full_path,
+ symname,
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ }
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
- } else if (server->ops->create_reparse_symlink) {
- rc = server->ops->create_reparse_symlink(xid, inode, direntry,
- pTcon, full_path,
- symname);
- goto symlink_exit;
+ break;
+
+ case CIFS_SYMLINK_TYPE_MFSYMLINKS:
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
+ rc = create_mf_symlink(xid, pTcon, cifs_sb,
+ full_path, symname);
+ }
+ break;
+
+ case CIFS_SYMLINK_TYPE_SFU:
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
+ rc = __cifs_sfu_make_node(xid, inode, direntry, pTcon,
+ full_path, S_IFLNK,
+ 0, symname);
+ }
+ break;
+
+ case CIFS_SYMLINK_TYPE_NATIVE:
+ case CIFS_SYMLINK_TYPE_NFS:
+ case CIFS_SYMLINK_TYPE_WSL:
+ if (server->ops->create_reparse_symlink) {
+ rc = server->ops->create_reparse_symlink(xid, inode,
+ direntry,
+ pTcon,
+ full_path,
+ symname);
+ goto symlink_exit;
+ }
+ break;
}
if (rc == 0) {
diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 344371dd895c..24a5f563df26 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -14,6 +14,20 @@
#include "fs_context.h"
#include "reparse.h"
+static int mknod_nfs(unsigned int xid, struct inode *inode,
+ struct dentry *dentry, struct cifs_tcon *tcon,
+ const char *full_path, umode_t mode, dev_t dev,
+ const char *symname);
+
+static int mknod_wsl(unsigned int xid, struct inode *inode,
+ struct dentry *dentry, struct cifs_tcon *tcon,
+ const char *full_path, umode_t mode, dev_t dev,
+ const char *symname);
+
+static int create_native_symlink(const unsigned int xid, struct inode *inode,
+ struct dentry *dentry, struct cifs_tcon *tcon,
+ const char *full_path, const char *symname);
+
static int detect_directory_symlink_target(struct cifs_sb_info *cifs_sb,
const unsigned int xid,
const char *full_path,
@@ -24,6 +38,22 @@ 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)
{
+ switch (get_cifs_symlink_type(CIFS_SB(inode->i_sb))) {
+ case CIFS_SYMLINK_TYPE_NATIVE:
+ return create_native_symlink(xid, inode, dentry, tcon, full_path, symname);
+ case CIFS_SYMLINK_TYPE_NFS:
+ return mknod_nfs(xid, inode, dentry, tcon, full_path, S_IFLNK, 0, symname);
+ case CIFS_SYMLINK_TYPE_WSL:
+ return mknod_wsl(xid, inode, dentry, tcon, full_path, S_IFLNK, 0, symname);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int create_native_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);
@@ -366,6 +396,7 @@ static int nfs_set_reparse_buf(struct reparse_nfs_data_buffer *buf,
case NFS_SPECFILE_SOCK:
dlen = 0;
break;
+ case NFS_SPECFILE_LNK: /* TODO: add support for NFS symlinks */
default:
return -EOPNOTSUPP;
}
@@ -384,7 +415,8 @@ static int nfs_set_reparse_buf(struct reparse_nfs_data_buffer *buf,
static int mknod_nfs(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
- const char *full_path, umode_t mode, dev_t dev)
+ const char *full_path, umode_t mode, dev_t dev,
+ const char *symname)
{
struct cifs_open_info_data data;
struct reparse_nfs_data_buffer *p;
@@ -424,6 +456,7 @@ static int wsl_set_reparse_buf(struct reparse_data_buffer *buf,
case IO_REPARSE_TAG_LX_FIFO:
case IO_REPARSE_TAG_AF_UNIX:
break;
+ case IO_REPARSE_TAG_LX_SYMLINK: /* TODO: add support for WSL symlinks */
default:
return -EOPNOTSUPP;
}
@@ -521,7 +554,8 @@ static int wsl_set_xattrs(struct inode *inode, umode_t _mode,
static int mknod_wsl(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
- const char *full_path, umode_t mode, dev_t dev)
+ const char *full_path, umode_t mode, dev_t dev,
+ const char *symname)
{
struct cifs_open_info_data data;
struct reparse_data_buffer buf;
@@ -566,17 +600,15 @@ int smb2_mknod_reparse(unsigned int xid, struct inode *inode,
const char *full_path, umode_t mode, dev_t dev)
{
struct smb3_fs_context *ctx = CIFS_SB(inode->i_sb)->ctx;
- int rc = -EOPNOTSUPP;
switch (ctx->reparse_type) {
case CIFS_REPARSE_TYPE_NFS:
- rc = mknod_nfs(xid, inode, dentry, tcon, full_path, mode, dev);
- break;
+ return mknod_nfs(xid, inode, dentry, tcon, full_path, mode, dev, NULL);
case CIFS_REPARSE_TYPE_WSL:
- rc = mknod_wsl(xid, inode, dentry, tcon, full_path, mode, dev);
- break;
+ return mknod_wsl(xid, inode, dentry, tcon, full_path, mode, dev, NULL);
+ default:
+ return -EOPNOTSUPP;
}
- return rc;
}
/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
@@ -849,7 +881,7 @@ out:
return rc;
}
-static int parse_reparse_symlink(struct reparse_symlink_data_buffer *sym,
+static int parse_reparse_native_symlink(struct reparse_symlink_data_buffer *sym,
u32 plen,
struct cifs_sb_info *cifs_sb,
const char *full_path,
@@ -936,7 +968,7 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
return parse_reparse_nfs((struct reparse_nfs_data_buffer *)buf,
cifs_sb, data);
case IO_REPARSE_TAG_SYMLINK:
- return parse_reparse_symlink(
+ return parse_reparse_native_symlink(
(struct reparse_symlink_data_buffer *)buf,
plen, cifs_sb, full_path, data);
case IO_REPARSE_TAG_LX_SYMLINK:
diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h
index ff05b0e75c92..5a753fec7e2c 100644
--- a/fs/smb/client/reparse.h
+++ b/fs/smb/client/reparse.h
@@ -50,6 +50,7 @@ static inline kgid_t wsl_make_kgid(struct cifs_sb_info *cifs_sb,
static inline u64 reparse_mode_nfs_type(mode_t mode)
{
switch (mode & S_IFMT) {
+ case S_IFLNK: return NFS_SPECFILE_LNK;
case S_IFBLK: return NFS_SPECFILE_BLK;
case S_IFCHR: return NFS_SPECFILE_CHR;
case S_IFIFO: return NFS_SPECFILE_FIFO;
@@ -61,6 +62,7 @@ static inline u64 reparse_mode_nfs_type(mode_t mode)
static inline u32 reparse_mode_wsl_tag(mode_t mode)
{
switch (mode & S_IFMT) {
+ case S_IFLNK: return IO_REPARSE_TAG_LX_SYMLINK;
case S_IFBLK: return IO_REPARSE_TAG_LX_BLK;
case S_IFCHR: return IO_REPARSE_TAG_LX_CHR;
case S_IFIFO: return IO_REPARSE_TAG_LX_FIFO;
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-06 08:24:54 +0300