XRootD
XrdOucCache.cc
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1 /******************************************************************************/
2 /* */
3 /* X r d O u c C a c h e . c c */
4 /* */
5 /* (c) 2020 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. */
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17 /* XRootD is distributed in the hope that it will be useful, but WITHOUT */
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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 */
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24 /* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
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29 /******************************************************************************/
30 
31 #include "XrdOuc/XrdOucCache.hh"
33 #include "XrdSys/XrdSysPageSize.hh"
34 
35 /******************************************************************************/
36 /* p g R e a d */
37 /******************************************************************************/
38 
39 int XrdOucCacheIO::pgRead(char *buff,
40  long long offs,
41  int rdlen,
42  std::vector<uint32_t> &csvec,
43  uint64_t opts,
44  int *csfix)
45 {
46  (void)csfix;
47  int bytes;
48 
49 // Read the data into the buffer
50 //
51  bytes = Read(buff, offs, rdlen);
52 
53 // Calculate checksums if so wanted
54 //
55  if (bytes > 0 && (opts & forceCS))
56  XrdOucPgrwUtils::csCalc((const char *)buff, (ssize_t)offs,
57  (size_t)bytes, csvec);
58 
59 // All done
60 //
61  return bytes;
62 }
63 
64 /******************************************************************************/
65 /* p g W r i t e */
66 /******************************************************************************/
67 
68 int XrdOucCacheIO::pgWrite(char *buff,
69  long long offs,
70  int wrlen,
71  std::vector<uint32_t> &csvec,
72  uint64_t opts,
73  int *csfix)
74 {
75  (void)csvec; (void)opts; (void)csfix;
76 
77 // Now just return the result of a plain write
78 //
79  return Write(buff, offs, wrlen);
80 }
81 
82 /******************************************************************************/
83 /* R e a d V */
84 /******************************************************************************/
85 
86 int XrdOucCacheIO::ReadV(const XrdOucIOVec *readV, int rnum)
87 {
88  int nbytes = 0, curCount = 0;
89 
90  for (int i = 0; i < rnum; i++)
91  {curCount = Read(readV[i].data, readV[i].offset, readV[i].size);
92  if (curCount != readV[i].size)
93  return (curCount < 0 ? curCount : -ESPIPE);
94  nbytes += curCount;
95  }
96  return nbytes;
97 }
98 
99 /******************************************************************************/
100 /* W r i t e V */
101 /******************************************************************************/
102 
103 int XrdOucCacheIO::WriteV(const XrdOucIOVec *writV, int wnum)
104 {
105  int nbytes = 0, curCount = 0;
106 
107  for (int i = 0; i < wnum; i++)
108  {curCount = Write(writV[i].data, writV[i].offset, writV[i].size);
109  if (curCount != writV[i].size)
110  {if (curCount < 0) return curCount;
111  return -ESPIPE;
112  }
113  nbytes += curCount;
114  }
115  return nbytes;
116 }
struct myOpts opts
virtual int WriteV(const XrdOucIOVec *writV, int wnum)
Definition: XrdOucCache.cc:103
virtual int Read(char *buff, long long offs, int rlen)=0
virtual int Write(char *buff, long long offs, int wlen)=0
static const uint64_t forceCS
Definition: XrdOucCache.hh:188
virtual int pgRead(char *buff, long long offs, int rdlen, std::vector< uint32_t > &csvec, uint64_t opts=0, int *csfix=0)
Definition: XrdOucCache.cc:39
virtual int pgWrite(char *buff, long long offs, int wrlen, std::vector< uint32_t > &csvec, uint64_t opts=0, int *csfix=0)
Definition: XrdOucCache.cc:68
virtual int ReadV(const XrdOucIOVec *readV, int rnum)
Definition: XrdOucCache.cc:86
static void csCalc(const char *data, off_t offs, size_t count, uint32_t *csval)