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[CIFS] Add posix (advisory) byte range locking support to cifs client

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Samba (version 3) server support for this is also currently being
done.  This client code is in an experimental path (requires enabling
/proc/fs/cifs/Experimental) while it is being tested.

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
2006-02-28 22:39:25 +00:00
parent d47d7c1a85
commit 08547b036b
5 changed files with 137 additions and 22 deletions
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78
fs/cifs/cifssmb.c
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@@ -1352,6 +1352,84 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
return rc;
}
int
CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
const __u16 smb_file_id, const int get_flag, const __u64 len,
const __u64 lkoffset, const __u16 lock_type, const int waitFlag)
{
struct smb_com_transaction2_sfi_req *pSMB = NULL;
struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
char *data_offset;
struct cifs_posix_lock *parm_data;
int rc = 0;
int bytes_returned = 0;
__u16 params, param_offset, offset, byte_count, count;
cFYI(1, ("Posix Lock"));
rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
if (rc)
return rc;
pSMBr = (struct smb_com_transaction2_sfi_rsp *)pSMB;
params = 6;
pSMB->MaxSetupCount = 0;
pSMB->Reserved = 0;
pSMB->Flags = 0;
pSMB->Timeout = 0;
pSMB->Reserved2 = 0;
param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
offset = param_offset + params;
data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
count = sizeof(struct cifs_posix_lock);
pSMB->MaxParameterCount = cpu_to_le16(2);
pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB PDU from sess */
pSMB->SetupCount = 1;
pSMB->Reserved3 = 0;
if(get_flag)
pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
else
pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
byte_count = 3 /* pad */ + params + count;
pSMB->DataCount = cpu_to_le16(count);
pSMB->ParameterCount = cpu_to_le16(params);
pSMB->TotalDataCount = pSMB->DataCount;
pSMB->TotalParameterCount = pSMB->ParameterCount;
pSMB->ParameterOffset = cpu_to_le16(param_offset);
parm_data = (struct cifs_posix_lock *)
(((char *) &pSMB->hdr.Protocol) + offset);
parm_data->lock_type = cpu_to_le16(lock_type);
if(waitFlag)
parm_data->lock_flags = 1;
parm_data->pid = cpu_to_le32(current->tgid);
parm_data->start = lkoffset;
parm_data->length = len; /* normalize negative numbers */
pSMB->DataOffset = cpu_to_le16(offset);
pSMB->InformationLevel = cpu_to_le16(SMB_SET_POSIX_LOCK);
pSMB->Reserved4 = 0;
pSMB->hdr.smb_buf_length += byte_count;
pSMB->ByteCount = cpu_to_le16(byte_count);
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
if (rc) {
cFYI(1, ("Send error in Posix Lock = %d", rc));
}
if (pSMB)
cifs_small_buf_release(pSMB);
/* Note: On -EAGAIN error only caller can retry on handle based calls
since file handle passed in no longer valid */
return rc;
}
int
CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
{