XRootD
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XrdPosixPrepIO.cc
Go to the documentation of this file.
1/******************************************************************************/
2/* */
3/* X r d P o s i x P r e p I O . c c */
4/* */
5/* (c) 2016 by the Board of Trustees of the Leland Stanford, Jr., University */
6/* All Rights Reserved */
7/* Produced by Andrew Hanushevsky for Stanford University under contract */
8/* DE-AC02-76-SFO0515 with the Department of Energy */
9/* */
10/* This file is part of the XRootD software suite. */
11/* */
12/* XRootD is free software: you can redistribute it and/or modify it under */
13/* the terms of the GNU Lesser General Public License as published by the */
14/* Free Software Foundation, either version 3 of the License, or (at your */
15/* option) any later version. */
16/* */
17/* XRootD is distributed in the hope that it will be useful, but WITHOUT */
18/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
19/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */
20/* License for more details. */
21/* */
22/* You should have received a copy of the GNU Lesser General Public License */
23/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
24/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
25/* */
26/* The copyright holder's institutional names and contributor's names may not */
27/* be used to endorse or promote products derived from this software without */
28/* specific prior written permission of the institution or contributor. */
29/******************************************************************************/
30
36
37/******************************************************************************/
38/* G l o b a l s */
39/******************************************************************************/
40
41namespace XrdPosixGlobals
42{
43extern XrdOucCache *theCache;
44extern XrdPosixStats Stats;
45};
46
47/******************************************************************************/
48/* D i s a b l e */
49/******************************************************************************/
50
52{
53 EPNAME("PrepIODisable");
54 XrdPosixObjGuard objGuard(fileP);
55
56 if(DEBUGON) {
57 DEBUG("Disabling deferred open " << obfuscateAuth(fileP->Origin()));
58 }
59
60 openRC = -ESHUTDOWN;
61}
62
63/******************************************************************************/
64/* I n i t */
65/******************************************************************************/
66
67bool XrdPosixPrepIO::Init(XrdOucCacheIOCB *iocbP)
68{
69 EPNAME("PrepIOInit");
70 XrdPosixObjGuard objGuard(fileP);
72 static int maxCalls = 64;
73
74// Count the number of entries here. We want to catch someone ignoring the
75// Update() call and using this object as it is very ineffecient.
76//
77 if (iCalls++ >= maxCalls)
78 {maxCalls = maxCalls*2;
79 DMSG("Init", iCalls <<" unexpected PrepIO calls!");
80 }
81
82// Do not try to open the file if there was previous error
83//
84 if (openRC) return false;
85
86// Check if the file is already opened. This caller may be vestigial
87//
88 if (fileP->clFile.IsOpen()) return true;
89
90// Count number of opens after the open was deferred (successful or not)
91//
94 (XrdPosixGlobals::theCache->Statistics.X.OpenDefers));
95
96// Open the file. It is too difficult to do an async open here as there is a
97// possible pending async request and doing both is not easy at all.
98//
99 Status = fileP->clFile.Open((std::string)fileP->Origin(), clFlags, clMode);
101
102// Make sure all went well. If so, do a Stat() call on the underlying file
103//
104 if (Status.IsOK()) fileP->Stat(Status);
105 else {openRC = XrdPosixMap::Result(Status, fileP->ecMsg, false);
106 if (DEBUGON && errno != ENOENT && errno != ELOOP)
107 {std::string eTxt = Status.ToString();
108 DEBUG(eTxt<<" deferred open "<< obfuscateAuth(fileP->Origin()));
109 }
111 return false;
112 }
113
114// Inform the cache that we have now have a new I/O object
115//
116 fileP->XCio->Update(*fileP);
117 return true;
118}
#define DEBUG(x)
#define EPNAME(x)
std::string obfuscateAuth(const std::string &input)
#define DMSG(x, y)
#define DEBUGON
void Count(long long &Dest)
XrdOucCacheStats Statistics
static int Result(const XrdCl::XRootDStatus &Status, XrdOucECMsg &ecMsg, bool retneg1=false)
void Count(long long &Dest)
XrdPosixStats Stats
XrdOucCache * theCache
bool IsOK() const
We're fine.
std::string ToString() const
Create a string representation.