source: vendor/3.6.0/source3/smbd/statvfs.c

/* 
   Unix SMB/CIFS implementation.
   VFS API's statvfs abstraction
   Copyright (C) Alexander Bokovoy                      2005
   Copyright (C) Steve French                           2005
   Copyright (C) James Peach                            2006
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "system/filesys.h"
#include "smbd/smbd.h"

#if defined(LINUX) && defined(HAVE_FSID_INT)
static int linux_statvfs(const char *path, vfs_statvfs_struct *statbuf)
{
        struct statvfs statvfs_buf;
        int result;

        result = statvfs(path, &statvfs_buf);

        if (!result) {
                statbuf->OptimalTransferSize = statvfs_buf.f_frsize;
                statbuf->BlockSize = statvfs_buf.f_bsize;
                statbuf->TotalBlocks = statvfs_buf.f_blocks;
                statbuf->BlocksAvail = statvfs_buf.f_bfree;
                statbuf->UserBlocksAvail = statvfs_buf.f_bavail;
                statbuf->TotalFileNodes = statvfs_buf.f_files;
                statbuf->FreeFileNodes = statvfs_buf.f_ffree;
                statbuf->FsIdentifier = statvfs_buf.f_fsid;

                /* Good defaults for Linux filesystems are case sensitive
                 * and case preserving.
                 */
                statbuf->FsCapabilities =
                    FILE_CASE_SENSITIVE_SEARCH | FILE_CASE_PRESERVED_NAMES;
        }
        return result;
}
#endif

#if defined(DARWINOS)

#include <sys/attr.h>

static int darwin_fs_capabilities(const char * path)
{
        int caps = 0;
        vol_capabilities_attr_t *vcaps;
        struct attrlist attrlist;
        char attrbuf[sizeof(u_int32_t) + sizeof(vol_capabilities_attr_t)];

#define FORMAT_CAP(vinfo, cap) \
        ( ((vinfo)->valid[VOL_CAPABILITIES_FORMAT] & (cap)) && \
           ((vinfo)->capabilities[VOL_CAPABILITIES_FORMAT] & (cap)) )

#define INTERFACE_CAP(vinfo, cap) \
        ( ((vinfo)->valid[VOL_CAPABILITIES_INTERFACES] & (cap)) && \
           ((vinfo)->capabilities[VOL_CAPABILITIES_INTERFACES] & (cap)) )

        ZERO_STRUCT(attrlist);
        attrlist.bitmapcount = ATTR_BIT_MAP_COUNT;
        attrlist.volattr = ATTR_VOL_CAPABILITIES;

        if (getattrlist(path, &attrlist, attrbuf, sizeof(attrbuf), 0) != 0) {
                DEBUG(0, ("getattrlist for %s capabilities failed: %s\n",
                            path, strerror(errno)));
                /* Return no capabilities on failure. */
                return 0;
        }

        vcaps =
            (vol_capabilities_attr_t *)(attrbuf + sizeof(u_int32_t));

        if (FORMAT_CAP(vcaps, VOL_CAP_FMT_SPARSE_FILES)) {
                caps |= FILE_SUPPORTS_SPARSE_FILES;
        }

        if (FORMAT_CAP(vcaps, VOL_CAP_FMT_CASE_SENSITIVE)) {
                caps |= FILE_CASE_SENSITIVE_SEARCH;
        }

        if (FORMAT_CAP(vcaps, VOL_CAP_FMT_CASE_PRESERVING)) {
                caps |= FILE_CASE_PRESERVED_NAMES;
        }

        if (INTERFACE_CAP(vcaps, VOL_CAP_INT_EXTENDED_SECURITY)) {
                caps |= FILE_PERSISTENT_ACLS;
        }

        return caps;
}

static int darwin_statvfs(const char *path, vfs_statvfs_struct *statbuf)
{
        struct statfs sbuf;
        int ret;

        ret = statfs(path, &sbuf);
        if (ret != 0) {
                return ret;
        }

        statbuf->OptimalTransferSize = sbuf.f_iosize;
        statbuf->BlockSize = sbuf.f_bsize;
        statbuf->TotalBlocks = sbuf.f_blocks;
        statbuf->BlocksAvail = sbuf.f_bfree;
        statbuf->UserBlocksAvail = sbuf.f_bavail;
        statbuf->TotalFileNodes = sbuf.f_files;
        statbuf->FreeFileNodes = sbuf.f_ffree;
        statbuf->FsIdentifier = *(uint64_t *)(&sbuf.f_fsid); /* Ick. */
        statbuf->FsCapabilities = darwin_fs_capabilities(sbuf.f_mntonname);

        return 0;
}
#endif

/* 
 sys_statvfs() is an abstraction layer over system-dependent statvfs()/statfs()
 for particular POSIX systems. Due to controversy of what is considered more important
 between LSB and FreeBSD/POSIX.1 (IEEE Std 1003.1-2001) we need to abstract the interface
 so that particular OS would use its preffered interface.
*/
int sys_statvfs(const char *path, vfs_statvfs_struct *statbuf)
{
#if defined(LINUX) && defined(HAVE_FSID_INT)
        return linux_statvfs(path, statbuf);
#elif defined(DARWINOS)
        return darwin_statvfs(path, statbuf);
#else
        /* BB change this to return invalid level */
#ifdef EOPNOTSUPP
        return EOPNOTSUPP;
#else
        return -1;
#endif /* EOPNOTSUPP */
#endif /* LINUX */

}