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smb3: Add posix create context for smb3.11 posix mounts

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Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Steve French 2018-05-31 19:16:54 -05:00
parent 28d59363ae
commit ce558b0e17
5 changed files with 101 additions and 3 deletions
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1
fs/cifs/cifsglob.h
View File

@ -1082,6 +1082,7 @@ struct cifs_open_parms {
int create_options;
const char *path;
struct cifs_fid *fid;
umode_t mode;
bool reconnect:1;
};

11
fs/cifs/connect.c
View File

@ -3963,6 +3963,12 @@ try_mount_again:
goto remote_path_check;
}
#ifdef CONFIG_CIFS_SMB311
/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
if (tcon->posix_extensions)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
#endif /* SMB3.11 */
/* tell server which Unix caps we support */
if (cap_unix(tcon->ses)) {
/* reset of caps checks mount to see if unix extensions
@ -4424,6 +4430,11 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
goto out;
}
#ifdef CONFIG_CIFS_SMB311
/* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
if (tcon->posix_extensions)
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
#endif /* SMB3.11 */
if (cap_unix(ses))
reset_cifs_unix_caps(0, tcon, NULL, vol_info);

2
fs/cifs/dir.c
View File

@ -369,7 +369,7 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
oparms.path = full_path;
oparms.fid = fid;
oparms.reconnect = false;
oparms.mode = mode;
rc = server->ops->open(xid, &oparms, oplock, buf);
if (rc) {
cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);

6
fs/cifs/smb2misc.c
View File

@ -455,8 +455,14 @@ cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
/* Windows doesn't allow paths beginning with \ */
if (from[0] == '\\')
start_of_path = from + 1;
#ifdef CONFIG_CIFS_SMB311
/* SMB311 POSIX extensions paths do not include leading slash */
else if (cifs_sb_master_tcon(cifs_sb)->posix_extensions)
start_of_path = from + 1;
#endif /* 311 */
else
start_of_path = from;
to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
cifs_sb->local_nls, map_type);
return to;

84
fs/cifs/smb2pdu.c
View File

@ -519,6 +519,64 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
return rc;
}
static struct create_posix *
create_posix_buf(umode_t mode)
{
struct create_posix *buf;
buf = kzalloc(sizeof(struct create_posix),
GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset =
cpu_to_le16(offsetof(struct create_posix, Mode));
buf->ccontext.DataLength = cpu_to_le32(4);
buf->ccontext.NameOffset =
cpu_to_le16(offsetof(struct create_posix, Name));
buf->ccontext.NameLength = cpu_to_le16(16);
/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
buf->Name[0] = 0x93;
buf->Name[1] = 0xAD;
buf->Name[2] = 0x25;
buf->Name[3] = 0x50;
buf->Name[4] = 0x9C;
buf->Name[5] = 0xB4;
buf->Name[6] = 0x11;
buf->Name[7] = 0xE7;
buf->Name[8] = 0xB4;
buf->Name[9] = 0x23;
buf->Name[10] = 0x83;
buf->Name[11] = 0xDE;
buf->Name[12] = 0x96;
buf->Name[13] = 0x8B;
buf->Name[14] = 0xCD;
buf->Name[15] = 0x7C;
buf->Mode = cpu_to_le32(mode);
cifs_dbg(FYI, "mode on posix create 0%o", mode);
return buf;
}
static int
add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
iov[num].iov_base = create_posix_buf(mode);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_posix);
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
*num_iovec = num + 1;
return 0;
}
#else
static void assemble_neg_contexts(struct smb2_negotiate_req *req,
unsigned int *total_len)
@ -1837,7 +1895,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
struct TCP_Server_Info *server;
struct cifs_tcon *tcon = oparms->tcon;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[4];
struct kvec iov[5]; /* make sure at least one for each open context */
struct kvec rsp_iov = {NULL, 0};
int resp_buftype;
int uni_path_len;
@ -1846,7 +1904,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
int rc = 0;
unsigned int n_iov = 2;
__u32 file_attributes = 0;
char *dhc_buf = NULL, *lc_buf = NULL;
char *dhc_buf = NULL, *lc_buf = NULL, *pc_buf = NULL;
int flags = 0;
unsigned int total_len;
@ -1963,6 +2021,27 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
dhc_buf = iov[n_iov-1].iov_base;
}
#ifdef CONFIG_CIFS_SMB311
if (tcon->posix_extensions) {
if (n_iov > 2) {
struct create_context *ccontext =
(struct create_context *)iov[n_iov-1].iov_base;
ccontext->Next =
cpu_to_le32(iov[n_iov-1].iov_len);
}
rc = add_posix_context(iov, &n_iov, oparms->mode);
if (rc) {
cifs_small_buf_release(req);
kfree(copy_path);
kfree(lc_buf);
kfree(dhc_buf);
return rc;
}
pc_buf = iov[n_iov-1].iov_base;
}
#endif /* SMB311 */
rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
&rsp_iov);
cifs_small_buf_release(req);
@ -2004,6 +2083,7 @@ creat_exit:
kfree(copy_path);
kfree(lc_buf);
kfree(dhc_buf);
kfree(pc_buf);
free_rsp_buf(resp_buftype, rsp);
return rc;
}