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smb: client: make smb2_compound_op() return resp buffer on success

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If @out_iov and @out_buftype are passed, then return compounded
responses regardless whether the request failed or not.  This will be
useful for detecting reparse points on SMB2_CREATE responses as
specified in MS-SMB2 2.2.14.

No functional changes.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-08-17 12:34:02 -03:00 committed by Steve French
parent 8b4e285d8c
commit c5f44a3d54
1 changed files with 26 additions and 26 deletions
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52
fs/smb/client/smb2inode.c
View File

@ -52,15 +52,16 @@ struct cop_vars {
* note: If cfile is passed, the reference to it is dropped here.
* So make sure that you do not reuse cfile after return from this func.
*
* If passing @err_iov and @err_buftype, ensure to make them both large enough (>= 3) to hold all
* error responses. Caller is also responsible for freeing them up.
* If passing @out_iov and @out_buftype, ensure to make them both large enough
* (>= 3) to hold all compounded responses. Caller is also responsible for
* freeing them up with free_rsp_buf().
*/
static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path,
__u32 desired_access, __u32 create_disposition, __u32 create_options,
umode_t mode, void *ptr, int command, struct cifsFileInfo *cfile,
__u8 **extbuf, size_t *extbuflen,
struct kvec *err_iov, int *err_buftype)
struct kvec *out_iov, int *out_buftype)
{
struct cop_vars *vars = NULL;
struct kvec *rsp_iov;
@ -529,9 +530,9 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
if (cfile)
cifsFileInfo_put(cfile);
if (rc && err_iov && err_buftype) {
memcpy(err_iov, rsp_iov, 3 * sizeof(*err_iov));
memcpy(err_buftype, resp_buftype, 3 * sizeof(*err_buftype));
if (out_iov && out_buftype) {
memcpy(out_iov, rsp_iov, 3 * sizeof(*out_iov));
memcpy(out_buftype, resp_buftype, 3 * sizeof(*out_buftype));
} else {
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
@ -550,8 +551,8 @@ int smb2_query_path_info(const unsigned int xid,
__u32 create_options = 0;
struct cifsFileInfo *cfile;
struct cached_fid *cfid = NULL;
struct kvec err_iov[3] = {};
int err_buftype[3] = {};
struct kvec out_iov[3] = {};
int out_buftype[3] = {};
bool islink;
int rc, rc2;
@ -577,15 +578,15 @@ int smb2_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
create_options, ACL_NO_MODE, data, SMB2_OP_QUERY_INFO, cfile,
NULL, NULL, err_iov, err_buftype);
NULL, NULL, out_iov, out_buftype);
if (rc) {
struct smb2_hdr *hdr = err_iov[0].iov_base;
struct smb2_hdr *hdr = out_iov[0].iov_base;
if (unlikely(!hdr || err_buftype[0] == CIFS_NO_BUFFER))
if (unlikely(!hdr || out_buftype[0] == CIFS_NO_BUFFER))
goto out;
if (rc == -EOPNOTSUPP && hdr->Command == SMB2_CREATE &&
hdr->Status == STATUS_STOPPED_ON_SYMLINK) {
rc = smb2_parse_symlink_response(cifs_sb, err_iov,
rc = smb2_parse_symlink_response(cifs_sb, out_iov,
&data->symlink_target);
if (rc)
goto out;
@ -614,13 +615,12 @@ int smb2_query_path_info(const unsigned int xid,
}
out:
free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
free_rsp_buf(out_buftype[0], out_iov[0].iov_base);
free_rsp_buf(out_buftype[1], out_iov[1].iov_base);
free_rsp_buf(out_buftype[2], out_iov[2].iov_base);
return rc;
}
int smb311_posix_query_path_info(const unsigned int xid,
struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
@ -632,8 +632,8 @@ int smb311_posix_query_path_info(const unsigned int xid,
int rc;
__u32 create_options = 0;
struct cifsFileInfo *cfile;
struct kvec err_iov[3] = {};
int err_buftype[3] = {};
struct kvec out_iov[3] = {};
int out_buftype[3] = {};
__u8 *sidsbuf = NULL;
__u8 *sidsbuf_end = NULL;
size_t sidsbuflen = 0;
@ -652,13 +652,13 @@ int smb311_posix_query_path_info(const unsigned int xid,
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, FILE_READ_ATTRIBUTES, FILE_OPEN,
create_options, ACL_NO_MODE, data, SMB2_OP_POSIX_QUERY_INFO, cfile,
&sidsbuf, &sidsbuflen, err_iov, err_buftype);
&sidsbuf, &sidsbuflen, out_iov, out_buftype);
if (rc == -EOPNOTSUPP) {
/* BB TODO: When support for special files added to Samba re-verify this path */
if (err_iov[0].iov_base && err_buftype[0] != CIFS_NO_BUFFER &&
((struct smb2_hdr *)err_iov[0].iov_base)->Command == SMB2_CREATE &&
((struct smb2_hdr *)err_iov[0].iov_base)->Status == STATUS_STOPPED_ON_SYMLINK) {
rc = smb2_parse_symlink_response(cifs_sb, err_iov, &data->symlink_target);
if (out_iov[0].iov_base && out_buftype[0] != CIFS_NO_BUFFER &&
((struct smb2_hdr *)out_iov[0].iov_base)->Command == SMB2_CREATE &&
((struct smb2_hdr *)out_iov[0].iov_base)->Status == STATUS_STOPPED_ON_SYMLINK) {
rc = smb2_parse_symlink_response(cifs_sb, out_iov, &data->symlink_target);
if (rc)
goto out;
}
@ -694,9 +694,9 @@ int smb311_posix_query_path_info(const unsigned int xid,
out:
kfree(sidsbuf);
free_rsp_buf(err_buftype[0], err_iov[0].iov_base);
free_rsp_buf(err_buftype[1], err_iov[1].iov_base);
free_rsp_buf(err_buftype[2], err_iov[2].iov_base);
free_rsp_buf(out_buftype[0], out_iov[0].iov_base);
free_rsp_buf(out_buftype[1], out_iov[1].iov_base);
free_rsp_buf(out_buftype[2], out_iov[2].iov_base);
return rc;
}