static int prealloc_ftruncate(vfs_handle_struct * handle,
files_struct * fsp,
SMB_OFF_T offset)
{
SMB_OFF_T *psize;
int ret = SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
/* Maintain the allocated space even in the face of truncates. */
if ((psize = VFS_FETCH_FSP_EXTENSION(handle, fsp))) {
preallocate_space(fsp->fh->fd, *psize);
}
return ret;
}
static int prealloc_ftruncate(vfs_handle_struct * handle,
files_struct * fsp,
int fd,
SMB_OFF_T offset)
{
SMB_OFF_T *psize;
int ret = SMB_VFS_NEXT_FTRUNCATE(handle, fsp, fd, offset);
/* Maintain the allocated space even in the face of truncates. If the
* truncate succeeded, we know that the current file size is the size
* the caller requested.
*/
if (ret == 0 ) {
if ((psize = VFS_FETCH_FSP_EXTENSION(handle, fsp))) {
preallocate_space(fd, offset, *psize);
}
}
return ret;
}
static int prealloc_open(vfs_handle_struct* handle,
const char * fname,
files_struct * fsp,
int flags,
mode_t mode)
{
int fd;
SMB_OFF_T size = 0;
const char * dot;
char fext[10];
if (!(flags & (O_CREAT|O_TRUNC))) {
/* Caller is not intending to rewrite the file. Let's not mess
* with the allocation in this case.
*/
goto normal_open;
}
*fext = '\0';
dot = strrchr(fname, '.');
if (dot && *++dot) {
if (strlen(dot) < sizeof(fext)) {
strncpy(fext, dot, sizeof(fext));
strnorm(fext, CASE_LOWER);
}
}
if (*fext == '\0') {
goto normal_open;
}
/* Syntax for specifying preallocation size is:
* MODULE: <extension> = <size>
* where
* <extension> is the file extension in lower case
* <size> is a size like 10, 10K, 10M
*/
size = conv_str_size(lp_parm_const_string(SNUM(handle->conn), MODULE,
fext, NULL));
if (size <= 0) {
/* No need to preallocate this file. */
goto normal_open;
}
fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
if (fd < 0) {
return fd;
}
/* Prellocate only if the file is being created or replaced. Note that
* Samba won't ever pass down O_TRUNC, which is why we have to handle
* truncate calls specially.
*/
if ((flags & O_CREAT) || (flags & O_TRUNC)) {
SMB_OFF_T * psize;
psize = VFS_ADD_FSP_EXTENSION(handle, fsp, SMB_OFF_T);
if (psize == NULL || *psize == -1) {
return fd;
}
DEBUG(module_debug,
("%s: preallocating %s (fd=%d) to %lld bytes\n",
MODULE, fname, fd, (long long)size));
*psize = size;
if (preallocate_space(fd, 0, *psize) < 0) {
VFS_REMOVE_FSP_EXTENSION(handle, fsp);
}
}
return fd;
normal_open:
/* We are not creating or replacing a file. Skip the
* preallocation.
*/
DEBUG(module_debug, ("%s: skipping preallocation for %s\n",
MODULE, fname));
return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
}
