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| author | Steve French <stfrench@microsoft.com> | 2019-03-28 22:32:49 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-04-01 14:33:34 -0500 |
| commit | 153322f7536a181e4d1b288aa6f01c0ce65f5c7c (patch) | |
| tree | c4cc94644199173ea35a722fec2219758b437e49 /fs/cifs/smb2proto.h | |
| parent | 2f94a3125b8742b05a011d62b16f52eb8f9ebe1c (diff) | |
| download | lwn-153322f7536a181e4d1b288aa6f01c0ce65f5c7c.tar.gz lwn-153322f7536a181e4d1b288aa6f01c0ce65f5c7c.zip | |
smb3: Fix enumerating snapshots to Azure
Some servers (see MS-SMB2 protocol specification
section 3.3.5.15.1) expect that the FSCTL enumerate snapshots
is done twice, with the first query having EXACTLY the minimum
size response buffer requested (16 bytes) which refreshes
the snapshot list (otherwise that and subsequent queries get
an empty list returned). So had to add code to set
the maximum response size differently for the first snapshot
query (which gets the size needed for the second query which
contains the actual list of snapshots).
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org> # 4.19+
Diffstat (limited to 'fs/cifs/smb2proto.h')
| -rw-r--r-- | fs/cifs/smb2proto.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h index 3c32d0cfea69..52df125e9189 100644 --- a/fs/cifs/smb2proto.h +++ b/fs/cifs/smb2proto.h @@ -142,11 +142,12 @@ extern int SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, extern void SMB2_open_free(struct smb_rqst *rqst); extern int SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 opcode, - bool is_fsctl, char *in_data, u32 indatalen, + bool is_fsctl, char *in_data, u32 indatalen, u32 maxoutlen, char **out_data, u32 *plen /* returned data len */); extern int SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, u64 persistent_fid, u64 volatile_fid, u32 opcode, - bool is_fsctl, char *in_data, u32 indatalen); + bool is_fsctl, char *in_data, u32 indatalen, + __u32 max_response_size); extern void SMB2_ioctl_free(struct smb_rqst *rqst); extern int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_file_id, u64 volatile_file_id); |