int
fstatvfs64 (int fd, struct statvfs64 *buf)
{
/* `struct statvfs64' is in fact identical to `struct statfs64' so
we can simply call fstatfs64. */
return __fstatfs64 (fd, (struct statfs64 *)buf);
}
/* Return information about the filesystem on which FD resides. */
int
__fstatvfs64 (int fd, struct statvfs64 *buf)
{
struct statfs64 fsbuf;
int res = __fstatfs64 (fd, &fsbuf);
#ifndef __ASSUME_STATFS64
if (res < 0 && errno == ENOSYS)
{
struct statvfs buf32;
res = fstatvfs (fd, &buf32);
if (res == 0)
{
buf->f_bsize = buf32.f_bsize;
buf->f_frsize = buf32.f_frsize;
buf->f_blocks = buf32.f_blocks;
buf->f_bfree = buf32.f_bfree;
buf->f_bavail = buf32.f_bavail;
buf->f_files = buf32.f_files;
buf->f_ffree = buf32.f_ffree;
buf->f_favail = buf32.f_favail;
buf->f_fsid = buf32.f_fsid;
buf->f_flag = buf32.f_flag;
buf->f_namemax = buf32.f_namemax;
memcpy (buf->__f_spare, buf32.__f_spare, sizeof (buf32.__f_spare));
}
}
#endif
if (res == 0)
{
/* Convert the result. */
struct stat64 st;
__internal_statvfs64 (NULL, buf, &fsbuf,
fstat64 (fd, &st) == -1 ? NULL : &st);
}
return res;
}
int
__posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
{
struct stat64 st;
if (offset < 0 || len < 0)
return EINVAL;
/* Perform overflow check. The outer cast relies on a GCC
extension. */
if ((__off64_t) ((uint64_t) offset + (uint64_t) len) < 0)
return EFBIG;
/* pwrite64 below will not do the right thing in O_APPEND mode. */
{
int flags = __fcntl (fd, F_GETFL, 0);
if (flags < 0 || (flags & O_APPEND) != 0)
return EBADF;
}
/* We have to make sure that this is really a regular file. */
if (__fxstat64 (_STAT_VER, fd, &st) != 0)
return EBADF;
if (S_ISFIFO (st.st_mode))
return ESPIPE;
if (! S_ISREG (st.st_mode))
return ENODEV;
if (len == 0)
{
/* This is racy, but there is no good way to satisfy a
zero-length allocation request. */
if (st.st_size < offset)
{
int ret = __ftruncate64 (fd, offset);
if (ret != 0)
ret = errno;
return ret;
}
return 0;
}
/* Minimize data transfer for network file systems, by issuing
single-byte write requests spaced by the file system block size.
(Most local file systems have fallocate support, so this fallback
code is not used there.) */
unsigned increment;
{
struct statfs64 f;
if (__fstatfs64 (fd, &f) != 0)
return errno;
if (f.f_bsize == 0)
increment = 512;
else if (f.f_bsize < 4096)
increment = f.f_bsize;
else
/* NFS clients do not propagate the block size of the underlying
storage and may report a much larger value which would still
leave holes after the loop below, so we cap the increment at
4096. */
increment = 4096;
}
/* Write a null byte to every block. This is racy; we currently
lack a better option. Compare-and-swap against a file mapping
might address local races, but requires interposition of a signal
handler to catch SIGBUS. */
for (offset += (len - 1) % increment; len > 0; offset += increment)
{
len -= increment;
if (offset < st.st_size)
{
unsigned char c;
ssize_t rsize = __libc_pread64 (fd, &c, 1, offset);
if (rsize < 0)
return errno;
/* If there is a non-zero byte, the block must have been
allocated already. */
else if (rsize == 1 && c != 0)
continue;
}
if (__libc_pwrite64 (fd, "", 1, offset) != 1)
return errno;
}
return 0;
}
int fstatfs(int fd, struct statfs* stat)
{
return __fstatfs64(fd, sizeof(struct statfs), stat);
}
