1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 : * ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Mozilla code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Mozilla Foundation.
19 : * Portions created by the Initial Developer are Copyright (C) 2010
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * Taras Glek <tglek@mozilla.com>
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either the GNU General Public License Version 2 or later (the "GPL"), or
27 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 : #if defined(XP_UNIX)
39 : #include <fcntl.h>
40 : #include <unistd.h>
41 : #include <sys/types.h>
42 : #include <sys/stat.h>
43 : #elif defined(XP_WIN)
44 : #include <windows.h>
45 : #elif defined(XP_OS2)
46 : #define INCL_DOSFILEMGR
47 : #include <os2.h>
48 : #endif
49 :
50 : #include "nscore.h"
51 : #include "private/pprio.h"
52 : #include "mozilla/FileUtils.h"
53 : #include "mozilla/FunctionTimer.h"
54 :
55 : bool
56 172 : mozilla::fallocate(PRFileDesc *aFD, PRInt64 aLength)
57 : {
58 : NS_TIME_FUNCTION;
59 : #if defined(HAVE_POSIX_FALLOCATE)
60 172 : return posix_fallocate(PR_FileDesc2NativeHandle(aFD), 0, aLength) == 0;
61 : #elif defined(XP_WIN)
62 : PROffset64 oldpos = PR_Seek64(aFD, 0, PR_SEEK_CUR);
63 : if (oldpos == -1)
64 : return false;
65 :
66 : if (PR_Seek64(aFD, aLength, PR_SEEK_SET) != aLength)
67 : return false;
68 :
69 : bool retval = (0 != SetEndOfFile((HANDLE)PR_FileDesc2NativeHandle(aFD)));
70 :
71 : PR_Seek64(aFD, oldpos, PR_SEEK_SET);
72 : return retval;
73 : #elif defined(XP_OS2)
74 : return aLength <= PR_UINT32_MAX
75 : && 0 == DosSetFileSize(PR_FileDesc2NativeHandle(aFD), (PRUint32)aLength);
76 : #elif defined(XP_MACOSX)
77 : int fd = PR_FileDesc2NativeHandle(aFD);
78 : fstore_t store = {F_ALLOCATECONTIG, F_PEOFPOSMODE, 0, aLength};
79 : // Try to get a continous chunk of disk space
80 : int ret = fcntl(fd, F_PREALLOCATE, &store);
81 : if (-1 == ret) {
82 : // OK, perhaps we are too fragmented, allocate non-continuous
83 : store.fst_flags = F_ALLOCATEALL;
84 : ret = fcntl(fd, F_PREALLOCATE, &store);
85 : if (-1 == ret)
86 : return false;
87 : }
88 : return 0 == ftruncate(fd, aLength);
89 : #elif defined(XP_UNIX)
90 : // The following is copied from fcntlSizeHint in sqlite
91 : /* If the OS does not have posix_fallocate(), fake it. First use
92 : ** ftruncate() to set the file size, then write a single byte to
93 : ** the last byte in each block within the extended region. This
94 : ** is the same technique used by glibc to implement posix_fallocate()
95 : ** on systems that do not have a real fallocate() system call.
96 : */
97 : PROffset64 oldpos = PR_Seek64(aFD, 0, PR_SEEK_CUR);
98 : if (oldpos == -1)
99 : return false;
100 :
101 : struct stat buf;
102 : int fd = PR_FileDesc2NativeHandle(aFD);
103 : if (fstat(fd, &buf))
104 : return false;
105 :
106 : if (buf.st_size >= aLength)
107 : return false;
108 :
109 : const int nBlk = buf.st_blksize;
110 :
111 : if (!nBlk)
112 : return false;
113 :
114 : if (ftruncate(fd, aLength))
115 : return false;
116 :
117 : int nWrite; // Return value from write()
118 : PRInt64 iWrite = ((buf.st_size + 2 * nBlk - 1) / nBlk) * nBlk - 1; // Next offset to write to
119 : do {
120 : nWrite = 0;
121 : if (PR_Seek64(aFD, iWrite, PR_SEEK_SET) == iWrite)
122 : nWrite = PR_Write(aFD, "", 1);
123 : iWrite += nBlk;
124 : } while (nWrite == 1 && iWrite < aLength);
125 :
126 : PR_Seek64(aFD, oldpos, PR_SEEK_SET);
127 : return nWrite == 1;
128 : #endif
129 : return false;
130 : }
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