[PATCH AUTOSEL 6.6 38/40] smb: client: introduce ->parse_reparse_point()

Sasha Levin
2023-11-28T21:09:33Z

From: Paulo Alcantara <pc@manguebit.com>

[ Upstream commit 539aad7f14dab7f947e5ab81901c0b20513a50db ]

Parse reparse point into cifs_open_info_data structure and feed it
through cifs_open_info_to_fattr().

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/smb/client/cifsglob.h | 6 ++++--
fs/smb/client/inode.c | 23 +++++++++++++---------
fs/smb/client/smb1ops.c | 41 ++++++++++++++++++++++------------------
fs/smb/client/smb2ops.c | 28 ++++++++++++++-------------
4 files changed, 56 insertions(+), 42 deletions(-)

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 02082621d8e07..1f84e302122f6 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -395,8 +395,7 @@ struct smb_version_operations {
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
- char **target_path,
- struct kvec *rsp_iov);
+ char **target_path);
/* open a file for non-posix mounts */
int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,
void *buf);
@@ -551,6 +550,9 @@ struct smb_version_operations {
bool (*is_status_io_timeout)(char *buf);
/* Check for STATUS_NETWORK_NAME_DELETED */
bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv);
+ int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb,
+ struct kvec *rsp_iov,
+ struct cifs_open_info_data *data);
};

struct smb_version_values {
diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c
index d7c302442c1ec..f67080e27d8e5 100644
--- a/fs/smb/client/inode.c
+++ b/fs/smb/client/inode.c
@@ -457,8 +457,7 @@ static int cifs_get_unix_fattr(const unsigned char *full_path,
return -EOPNOTSUPP;
rc = server->ops->query_symlink(xid, tcon,
cifs_sb, full_path,
- &fattr->cf_symlink_target,
- NULL);
+ &fattr->cf_symlink_target);
cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
}
return rc;
@@ -1029,22 +1028,28 @@ static int reparse_info_to_fattr(struct cifs_open_info_data *data,
if (!rc)
iov = &rsp_iov;
}
+
+ rc = -EOPNOTSUPP;
switch ((data->reparse_tag = tag)) {
case 0: /* SMB1 symlink */
- iov = NULL;
- fallthrough;
- case IO_REPARSE_TAG_NFS:
- case IO_REPARSE_TAG_SYMLINK:
- if (!data->symlink_target && server->ops->query_symlink) {
+ if (server->ops->query_symlink) {
rc = server->ops->query_symlink(xid, tcon,
cifs_sb, full_path,
- &data->symlink_target,
- iov);
+ &data->symlink_target);
}
break;
case IO_REPARSE_TAG_MOUNT_POINT:
cifs_create_junction_fattr(fattr, sb);
+ rc = 0;
goto out;
+ default:
+ if (data->symlink_target) {
+ rc = 0;
+ } else if (server->ops->parse_reparse_point) {
+ rc = server->ops->parse_reparse_point(cifs_sb,
+ iov, data);
+ }
+ break;
}

cifs_open_info_to_fattr(fattr, data, sb);
diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c
index 6b4d8effa79df..0dd599004e042 100644
--- a/fs/smb/client/smb1ops.c
+++ b/fs/smb/client/smb1ops.c
@@ -976,32 +976,36 @@ static int cifs_query_symlink(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const char *full_path,
- char **target_path,
- struct kvec *rsp_iov)
+ char **target_path)
{
- struct reparse_data_buffer *buf;
- TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
- bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);
- u32 plen = le16_to_cpu(io->ByteCount);
int rc;

cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path);

- /* Check for unix extensions */
- if (cap_unix(tcon->ses)) {
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
- cifs_sb->local_nls,
- cifs_remap(cifs_sb));
- if (rc == -EREMOTE)
- rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
- target_path,
- cifs_sb->local_nls);
- return rc;
- }
+ if (!cap_unix(tcon->ses))
+ return -EOPNOTSUPP;
+
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
+ cifs_sb->local_nls, cifs_remap(cifs_sb));
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path, cifs_sb->local_nls);
+ return rc;
+}
+
+static int cifs_parse_reparse_point(struct cifs_sb_info *cifs_sb,
+ struct kvec *rsp_iov,
+ struct cifs_open_info_data *data)
+{
+ struct reparse_data_buffer *buf;
+ TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;
+ bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);
+ u32 plen = le16_to_cpu(io->ByteCount);

buf = (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol +
le32_to_cpu(io->DataOffset));
- return parse_reparse_point(buf, plen, cifs_sb, unicode, target_path);
+ return parse_reparse_point(buf, plen, cifs_sb, unicode,
+ &data->symlink_target);
}

static bool
@@ -1200,6 +1204,7 @@ struct smb_version_operations smb1_operations = {
.rename = CIFSSMBRename,
.create_hardlink = CIFSCreateHardLink,
.query_symlink = cifs_query_symlink,
+ .parse_reparse_point = cifs_parse_reparse_point,
.open = cifs_open_file,
.set_fid = cifs_set_fid,
.close = cifs_close_file,
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index abc0792698349..33b20e43372d0 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2941,6 +2941,12 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
return parse_reparse_symlink(
(struct reparse_symlink_data_buffer *)buf,
plen, unicode, target_path, cifs_sb);
+ 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, "srv returned unknown symlink buffer tag:0x%08x\n",
le32_to_cpu(buf->ReparseTag));
@@ -2948,22 +2954,18 @@ int parse_reparse_point(struct reparse_data_buffer *buf,
}
}

-static int smb2_query_symlink(const unsigned int xid,
- struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb,
- const char *full_path,
- char **target_path,
- struct kvec *rsp_iov)
+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);

- cifs_tcon_dbg(FYI, "%s: path: %s\n", __func__, full_path);
-
buf = (struct reparse_data_buffer *)((u8 *)io +
le32_to_cpu(io->OutputOffset));
- return parse_reparse_point(buf, plen, cifs_sb, true, target_path);
+ return parse_reparse_point(buf, plen, cifs_sb,
+ true, &data->symlink_target);
}

static int smb2_query_reparse_point(const unsigned int xid,
@@ -5192,7 +5194,7 @@ struct smb_version_operations smb20_operations = {
.unlink = smb2_unlink,
.rename = smb2_rename_path,
.create_hardlink = smb2_create_hardlink,
- .query_symlink = smb2_query_symlink,
+ .parse_reparse_point = smb2_parse_reparse_point,
.query_mf_symlink = smb3_query_mf_symlink,
.create_mf_symlink = smb3_create_mf_symlink,
.open = smb2_open_file,
@@ -5294,7 +5296,7 @@ struct smb_version_operations smb21_operations = {
.unlink = smb2_unlink,
.rename = smb2_rename_path,
.create_hardlink = smb2_create_hardlink,
- .query_symlink = smb2_query_symlink,
+ .parse_reparse_point = smb2_parse_reparse_point,
.query_mf_symlink = smb3_query_mf_symlink,
.create_mf_symlink = smb3_create_mf_symlink,
.open = smb2_open_file,
@@ -5399,7 +5401,7 @@ struct smb_version_operations smb30_operations = {
.unlink = smb2_unlink,
.rename = smb2_rename_path,
.create_hardlink = smb2_create_hardlink,
- .query_symlink = smb2_query_symlink,
+ .parse_reparse_point = smb2_parse_reparse_point,
.query_mf_symlink = smb3_query_mf_symlink,
.create_mf_symlink = smb3_create_mf_symlink,
.open = smb2_open_file,
@@ -5513,7 +5515,7 @@ struct smb_version_operations smb311_operations = {
.unlink = smb2_unlink,
.rename = smb2_rename_path,
.create_hardlink = smb2_create_hardlink,
- .query_symlink = smb2_query_symlink,
+ .parse_reparse_point = smb2_parse_reparse_point,
.query_mf_symlink = smb3_query_mf_symlink,
.create_mf_symlink = smb3_create_mf_symlink,
.open = smb2_open_file,
--
2.42.0