2 Unix SMB/CIFS implementation.
3 functions to calculate the free disk space
4 Copyright (C) Andrew Tridgell 1998-2000
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "system/filesys.h"
26 * @brief Utility functions for getting the amount of free disk space
29 /* Return the number of TOSIZE-byte blocks used by
30 BLOCKS FROMSIZE-byte blocks, rounding away from zero.
32 static uint64_t adjust_blocks(uint64_t blocks, uint64_t fromsize, uint64_t tosize)
34 if (fromsize == tosize) /* e.g., from 512 to 512 */
36 else if (fromsize > tosize) /* e.g., from 2048 to 512 */
37 return blocks * (fromsize / tosize);
38 else /* e.g., from 256 to 512 */
39 return (blocks + 1) / (tosize / fromsize);
43 * Retrieve amount of free disk space.
44 * this does all of the system specific guff to get the free disk space.
45 * It is derived from code in the GNU fileutils package, but has been
46 * considerably mangled for use here
48 * results are returned in *dfree and *dsize, in 512 byte units
50 int sys_fsusage(const char *path, uint64_t *dfree, uint64_t *dsize)
52 #ifdef STAT_STATFS3_OSF1
53 #define CONVERT_BLOCKS(B) adjust_blocks ((uint64_t)(B), (uint64_t)fsd.f_fsize, (uint64_t)512)
56 if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
58 #endif /* STAT_STATFS3_OSF1 */
60 #ifdef STAT_STATFS2_FS_DATA /* Ultrix */
61 #define CONVERT_BLOCKS(B) adjust_blocks ((uint64_t)(B), (uint64_t)1024, (uint64_t)512)
64 if (statfs (path, &fsd) != 1)
67 (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot);
68 (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen);
69 #endif /* STAT_STATFS2_FS_DATA */
71 #ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
72 #define CONVERT_BLOCKS(B) adjust_blocks ((uint64_t)(B), (uint64_t)fsd.f_bsize, (uint64_t)512)
75 if (statfs (path, &fsd) < 0)
78 #ifdef STATFS_TRUNCATES_BLOCK_COUNTS
79 /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
80 struct statfs are truncated to 2GB. These conditions detect that
81 truncation, presumably without botching the 4.1.1 case, in which
82 the values are not truncated. The correct counts are stored in
83 undocumented spare fields. */
84 if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) {
85 fsd.f_blocks = fsd.f_spare[0];
86 fsd.f_bfree = fsd.f_spare[1];
87 fsd.f_bavail = fsd.f_spare[2];
89 #endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
90 #endif /* STAT_STATFS2_BSIZE */
93 #ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
94 #define CONVERT_BLOCKS(B) adjust_blocks ((uint64_t)(B), (uint64_t)fsd.f_fsize, (uint64_t)512)
98 if (statfs (path, &fsd) < 0)
100 #endif /* STAT_STATFS2_FSIZE */
102 #ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
103 # if _AIX || defined(_CRAY)
104 # define CONVERT_BLOCKS(B) adjust_blocks ((uint64_t)(B), (uint64_t)fsd.f_bsize, (uint64_t)512)
106 # define f_bavail f_bfree
109 # define CONVERT_BLOCKS(B) ((uint64_t)B)
110 # ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx */
111 # ifndef DOLPHIN /* DOLPHIN 3.8.alfa/7.18 has f_bavail */
112 # define f_bavail f_bfree
119 if (statfs (path, &fsd, sizeof fsd, 0) < 0)
121 /* Empirically, the block counts on most SVR3 and SVR3-derived
122 systems seem to always be in terms of 512-byte blocks,
123 no matter what value f_bsize has. */
125 #endif /* STAT_STATFS4 */
127 #if defined(STAT_STATVFS) || defined(STAT_STATVFS64) /* SVR4 */
128 # define CONVERT_BLOCKS(B) \
129 adjust_blocks ((uint64_t)(B), fsd.f_frsize ? (uint64_t)fsd.f_frsize : (uint64_t)fsd.f_bsize, (uint64_t)512)
131 #ifdef STAT_STATVFS64
132 struct statvfs64 fsd;
133 if (statvfs64(path, &fsd) < 0) return -1;
136 if (statvfs(path, &fsd) < 0) return -1;
139 /* f_frsize isn't guaranteed to be supported. */
141 #endif /* STAT_STATVFS */
143 #ifndef CONVERT_BLOCKS
144 /* we don't have any dfree code! */
147 #if !defined(STAT_STATFS2_FS_DATA)
149 (*dsize) = CONVERT_BLOCKS (fsd.f_blocks);
150 (*dfree) = CONVERT_BLOCKS (fsd.f_bavail);
151 #endif /* not STAT_STATFS2_FS_DATA */