diff options
Diffstat (limited to 'source/smbd/dfree.c')
| -rw-r--r-- | source/smbd/dfree.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/source/smbd/dfree.c b/source/smbd/dfree.c new file mode 100644 index 00000000000..c96a599e77b --- /dev/null +++ b/source/smbd/dfree.c @@ -0,0 +1,229 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + functions to calculate the free disk space + Copyright (C) Andrew Tridgell 1998 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + + +extern int DEBUGLEVEL; + +/**************************************************************************** +normalise for DOS usage +****************************************************************************/ +static void disk_norm(SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize) +{ + /* check if the disk is beyond the max disk size */ + SMB_BIG_UINT maxdisksize = lp_maxdisksize(); + if (maxdisksize) { + /* convert to blocks - and don't overflow */ + maxdisksize = ((maxdisksize*1024)/(*bsize))*1024; + if (*dsize > maxdisksize) *dsize = maxdisksize; + if (*dfree > maxdisksize) *dfree = maxdisksize-1; + /* the -1 should stop applications getting div by 0 + errors */ + } + + while (*dfree > WORDMAX || *dsize > WORDMAX || *bsize < 512) { + *dfree /= 2; + *dsize /= 2; + *bsize *= 2; + if (*bsize > WORDMAX) { + *bsize = WORDMAX; + if (*dsize > WORDMAX) + *dsize = WORDMAX; + if (*dfree > WORDMAX) + *dfree = WORDMAX; + break; + } + } +} + + +/* Return the number of TOSIZE-byte blocks used by + BLOCKS FROMSIZE-byte blocks, rounding away from zero. +*/ +static SMB_BIG_UINT adjust_blocks(SMB_BIG_UINT blocks, SMB_BIG_UINT fromsize, SMB_BIG_UINT tosize) +{ + if (fromsize == tosize) /* e.g., from 512 to 512 */ + return blocks; + else if (fromsize > tosize) /* e.g., from 2048 to 512 */ + return blocks * (fromsize / tosize); + else /* e.g., from 256 to 512 */ + return (blocks + 1) / (tosize / fromsize); +} + +/* this does all of the system specific guff to get the free disk space. + It is derived from code in the GNU fileutils package, but has been + considerably mangled for use here + + results are returned in *dfree and *dsize, in 512 byte units +*/ +static int fsusage(const char *path, SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize) +{ +#ifdef STAT_STATFS3_OSF1 +#define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512) + struct statfs fsd; + + if (statfs (path, &fsd, sizeof (struct statfs)) != 0) + return -1; +#endif /* STAT_STATFS3_OSF1 */ + +#ifdef STAT_STATFS2_FS_DATA /* Ultrix */ +#define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)1024, (SMB_BIG_UINT)512) + struct fs_data fsd; + + if (statfs (path, &fsd) != 1) + return -1; + + (*dsize) = CONVERT_BLOCKS (fsd.fd_req.btot); + (*dfree) = CONVERT_BLOCKS (fsd.fd_req.bfreen); +#endif /* STAT_STATFS2_FS_DATA */ + +#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */ +#define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512) + struct statfs fsd; + + if (statfs (path, &fsd) < 0) + return -1; + +#ifdef STATFS_TRUNCATES_BLOCK_COUNTS + /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the + struct statfs are truncated to 2GB. These conditions detect that + truncation, presumably without botching the 4.1.1 case, in which + the values are not truncated. The correct counts are stored in + undocumented spare fields. */ + if (fsd.f_blocks == 0x1fffff && fsd.f_spare[0] > 0) { + fsd.f_blocks = fsd.f_spare[0]; + fsd.f_bfree = fsd.f_spare[1]; + fsd.f_bavail = fsd.f_spare[2]; + } +#endif /* STATFS_TRUNCATES_BLOCK_COUNTS */ +#endif /* STAT_STATFS2_BSIZE */ + + +#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */ +#define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_fsize, (SMB_BIG_UINT)512) + + struct statfs fsd; + + if (statfs (path, &fsd) < 0) + return -1; +#endif /* STAT_STATFS2_FSIZE */ + +#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */ +# if _AIX || defined(_CRAY) +# define CONVERT_BLOCKS(B) adjust_blocks ((SMB_BIG_UINT)(B), (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512) +# ifdef _CRAY +# define f_bavail f_bfree +# endif +# else +# define CONVERT_BLOCKS(B) ((SMB_BIG_UINT)B) +# ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx */ +# ifndef DOLPHIN /* DOLPHIN 3.8.alfa/7.18 has f_bavail */ +# define f_bavail f_bfree +# endif +# endif +# endif + + struct statfs fsd; + + if (statfs (path, &fsd, sizeof fsd, 0) < 0) + return -1; + /* Empirically, the block counts on most SVR3 and SVR3-derived + systems seem to always be in terms of 512-byte blocks, + no matter what value f_bsize has. */ + +#endif /* STAT_STATFS4 */ + +#ifdef STAT_STATVFS /* SVR4 */ +# define CONVERT_BLOCKS(B) \ + adjust_blocks ((SMB_BIG_UINT)(B), fsd.f_frsize ? (SMB_BIG_UINT)fsd.f_frsize : (SMB_BIG_UINT)fsd.f_bsize, (SMB_BIG_UINT)512) + +#ifdef STAT_STATVFS64 + struct statvfs64 fsd; + if (statvfs64(path, &fsd) < 0) return -1; +#else + struct statvfs fsd; + if (statvfs(path, &fsd) < 0) return -1; +#endif + + /* f_frsize isn't guaranteed to be supported. */ + +#endif /* STAT_STATVFS */ + +#ifndef CONVERT_BLOCKS + /* we don't have any dfree code! */ + return -1; +#else +#if !defined(STAT_STATFS2_FS_DATA) + /* !Ultrix */ + (*dsize) = CONVERT_BLOCKS (fsd.f_blocks); + (*dfree) = CONVERT_BLOCKS (fsd.f_bavail); +#endif /* not STAT_STATFS2_FS_DATA */ +#endif + + return 0; +} + +/**************************************************************************** + return number of 1K blocks available on a path and total number +****************************************************************************/ +static SMB_BIG_UINT disk_free(char *path,SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize) +{ + int dfree_retval; + + (*dfree) = (*dsize) = 0; + (*bsize) = 512; + + fsusage(path, dfree, dsize); + + if (*bsize < 256) { + *bsize = 512; + } + + if ((*dsize)<1) { + static int done; + if (!done) { + DEBUG(0,("WARNING: dfree is broken on this system\n")); + done=1; + } + *dsize = 20*1024*1024/(*bsize); + *dfree = MAX(1,*dfree); + } + + disk_norm(bsize,dfree,dsize); + + if ((*bsize) < 1024) { + dfree_retval = (*dfree)/(1024/(*bsize)); + } else { + dfree_retval = ((*bsize)/1024)*(*dfree); + } + + return(dfree_retval); +} + + +/**************************************************************************** +wrap it to get filenames right +****************************************************************************/ +SMB_BIG_UINT sys_disk_free(char *path,SMB_BIG_UINT *bsize,SMB_BIG_UINT *dfree,SMB_BIG_UINT *dsize) +{ + return(disk_free(dos_to_unix(path,False),bsize,dfree,dsize)); +} |