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s3: Fix strict locking with chained reads

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Move the strict lock/unlock code down a level for reads to avoid
calling chain_reply before the unlock.
This commit is contained in:
Tim Prouty 2009-05-12 16:32:32 -07:00
parent 5aefb44bf0
commit c60bb39df3
1 changed files with 24 additions and 22 deletions
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46
source3/smbd/reply.c
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@ -3352,12 +3352,22 @@ static void send_file_readX(connection_struct *conn, struct smb_request *req,
{
SMB_STRUCT_STAT sbuf;
ssize_t nread = -1;
struct lock_struct lock;
if(SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
reply_unixerror(req, ERRDOS, ERRnoaccess);
return;
}
init_strict_lock_struct(fsp, (uint32)req->smbpid,
(uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
&lock);
if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
reply_doserror(req, ERRDOS, ERRlock);
return;
}
if (!S_ISREG(sbuf.st_mode) || (startpos > sbuf.st_size)
|| (smb_maxcnt > (sbuf.st_size - startpos))) {
/*
@ -3419,8 +3429,7 @@ static void send_file_readX(connection_struct *conn, struct smb_request *req,
DEBUG( 3, ( "send_file_readX: fake_sendfile fnum=%d max=%d nread=%d\n",
fsp->fnum, (int)smb_maxcnt, (int)nread ) );
/* No outbuf here means successful sendfile. */
TALLOC_FREE(req->outbuf);
return;
goto strict_unlock;
}
DEBUG(0,("send_file_readX: sendfile failed for file %s (%s). Terminating\n",
@ -3447,12 +3456,10 @@ static void send_file_readX(connection_struct *conn, struct smb_request *req,
if (nread != smb_maxcnt + sizeof(headerbuf)) {
sendfile_short_send(fsp, nread, sizeof(headerbuf), smb_maxcnt);
}
/* No outbuf here means successful sendfile. */
TALLOC_FREE(req->outbuf);
SMB_PERFCOUNT_SET_MSGLEN_OUT(&req->pcd, nread);
SMB_PERFCOUNT_END(&req->pcd);
return;
goto strict_unlock;
}
normal_read:
@ -3478,8 +3485,7 @@ normal_read:
fsp->fsp_name, strerror(errno) ));
exit_server_cleanly("send_file_readX: fake_sendfile failed");
}
TALLOC_FREE(req->outbuf);
return;
goto strict_unlock;
}
nosendfile_read:
@ -3487,6 +3493,9 @@ nosendfile_read:
reply_outbuf(req, 12, smb_maxcnt);
nread = read_file(fsp, smb_buf(req->outbuf), startpos, smb_maxcnt);
SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
if (nread < 0) {
reply_unixerror(req, ERRDOS, ERRnoaccess);
return;
@ -3498,6 +3507,12 @@ nosendfile_read:
fsp->fnum, (int)smb_maxcnt, (int)nread ) );
chain_reply(req);
return;
strict_unlock:
SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
TALLOC_FREE(req->outbuf);
return;
}
/****************************************************************************
@ -3510,7 +3525,6 @@ void reply_read_and_X(struct smb_request *req)
files_struct *fsp;
SMB_OFF_T startpos;
size_t smb_maxcnt;
struct lock_struct lock;
bool big_readX = False;
#if 0
size_t smb_mincnt = SVAL(req->vwv+6, 0);
@ -3599,26 +3613,14 @@ void reply_read_and_X(struct smb_request *req)
}
init_strict_lock_struct(fsp, (uint32)req->smbpid,
(uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
&lock);
if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
END_PROFILE(SMBreadX);
reply_doserror(req, ERRDOS, ERRlock);
return;
}
if (!big_readX &&
schedule_aio_read_and_X(conn, req, fsp, startpos, smb_maxcnt)) {
goto strict_unlock;
goto out;
}
send_file_readX(conn, req, fsp, startpos, smb_maxcnt);
strict_unlock:
SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
out:
END_PROFILE(SMBreadX);
return;
}