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smb: client: introduce ->parse_reparse_point() 

[ 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>
This commit is contained in:
Paulo Alcantara 2023-11-21 20:12:53 -03:00 committed by Greg Kroah-Hartman
parent d5c959a1db
commit 4d07e5df13
4 changed files with 56 additions and 42 deletions
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6
fs/smb/client/cifsglob.h
View File

@ -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 {

23
fs/smb/client/inode.c
View File

@ -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;
@ -1035,22 +1034,28 @@ 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);

41
fs/smb/client/smb1ops.c
View File

@ -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)
{
int rc;
cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path);
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);
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;
}
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,

28
fs/smb/client/smb2ops.c
View File

@ -2949,6 +2949,12 @@ 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));
@ -2956,22 +2962,18 @@ 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,
@ -5215,7 +5217,7 @@ 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,
@ -5317,7 +5319,7 @@ 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,
@ -5422,7 +5424,7 @@ 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,
@ -5536,7 +5538,7 @@ 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,