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Unix SMB/CIFS implementation.
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Files[] structure handling
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "smbd/globals.h"
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#define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
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#define FILE_HANDLE_OFFSET 0x1000
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/****************************************************************************
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Return a unique number identifying this fsp over the life of this pid.
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****************************************************************************/
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static unsigned long get_gen_count(void)
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if ((++file_gen_counter) == 0)
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return ++file_gen_counter;
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return file_gen_counter;
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/****************************************************************************
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Find first available file slot.
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****************************************************************************/
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NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
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files_struct **result)
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/* we want to give out file handles differently on each new
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connection because of a common bug in MS clients where they try to
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reuse a file descriptor from an earlier smb connection. This code
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increases the chance that the errant client will get an error rather
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than causing corruption */
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if (first_file == 0) {
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first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
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/* TODO: Port the id-tree implementation from Samba4 */
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i = bitmap_find(file_bmap, first_file);
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DEBUG(0,("ERROR! Out of file structures\n"));
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/* TODO: We have to unconditionally return a DOS error here,
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* W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
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* NTSTATUS negotiated */
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return NT_STATUS_TOO_MANY_OPENED_FILES;
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fsp = SMB_MALLOC_P(files_struct);
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return NT_STATUS_NO_MEMORY;
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fsp->fh = SMB_MALLOC_P(struct fd_handle);
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return NT_STATUS_NO_MEMORY;
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ZERO_STRUCTP(fsp->fh);
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fsp->fh->ref_count = 1;
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fsp->fh->gen_id = get_gen_count();
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GetTimeOfDay(&fsp->open_time);
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first_file = (i+1) % real_max_open_files;
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bitmap_set(file_bmap, i);
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fsp->fnum = i + FILE_HANDLE_OFFSET;
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SMB_ASSERT(fsp->fnum < 65536);
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string_set(&fsp->fsp_name,"");
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DLIST_ADD(Files, fsp);
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DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
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i, fsp->fnum, files_used));
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req->chain_fsp = fsp;
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/* A new fsp invalidates the positive and
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negative fsp_fi_cache as the new fsp is pushed
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at the start of the list and we search from
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a cache hit to the *end* of the list. */
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ZERO_STRUCT(fsp_fi_cache);
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conn->num_files_open++;
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/****************************************************************************
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Close all open files for a connection.
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****************************************************************************/
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void file_close_conn(connection_struct *conn)
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files_struct *fsp, *next;
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for (fsp=Files;fsp;fsp=next) {
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if (fsp->conn == conn) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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/****************************************************************************
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Close all open files for a pid and a vuid.
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****************************************************************************/
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void file_close_pid(uint16 smbpid, int vuid)
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files_struct *fsp, *next;
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for (fsp=Files;fsp;fsp=next) {
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if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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/****************************************************************************
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Initialise file structures.
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****************************************************************************/
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#define MAX_OPEN_FUDGEFACTOR 20
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int request_max_open_files = lp_max_open_files();
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* Set the max_open files to be the requested
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* max plus a fudgefactor to allow for the extra
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* fd's we need such as log files etc...
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real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
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real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
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if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
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real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
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if(real_max_open_files != request_max_open_files) {
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DEBUG(1,("file_init: Information only: requested %d \
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open files, %d are available.\n", request_max_open_files, real_max_open_files));
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SMB_ASSERT(real_max_open_files > 100);
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file_bmap = bitmap_allocate(real_max_open_files);
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exit_server("out of memory in file_init");
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/****************************************************************************
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Close files open by a specified vuid.
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****************************************************************************/
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void file_close_user(int vuid)
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files_struct *fsp, *next;
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for (fsp=Files;fsp;fsp=next) {
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if (fsp->vuid == vuid) {
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close_file(NULL, fsp, SHUTDOWN_CLOSE);
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* Walk the files table until "fn" returns non-NULL
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struct files_struct *file_walk_table(
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struct files_struct *(*fn)(struct files_struct *fsp,
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struct files_struct *fsp, *next;
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for (fsp = Files; fsp; fsp = next) {
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struct files_struct *ret;
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ret = fn(fsp, private_data);
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/****************************************************************************
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Debug to enumerate all open files in the smbd.
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****************************************************************************/
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void file_dump_open_table(void)
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for (fsp=Files;fsp;fsp=fsp->next,count++) {
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DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, gen = %lu, fileid=%s\n",
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count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->gen_id,
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file_id_string_tos(&fsp->file_id)));
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/****************************************************************************
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Find a fsp given a file descriptor.
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****************************************************************************/
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files_struct *file_find_fd(int fd)
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for (fsp=Files;fsp;fsp=fsp->next,count++) {
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if (fsp->fh->fd == fd) {
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DLIST_PROMOTE(Files, fsp);
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/****************************************************************************
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Find a fsp given a device, inode and file_id.
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****************************************************************************/
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files_struct *file_find_dif(struct file_id id, unsigned long gen_id)
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for (fsp=Files;fsp;fsp=fsp->next,count++) {
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/* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
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if (file_id_equal(&fsp->file_id, &id) &&
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fsp->fh->gen_id == gen_id ) {
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DLIST_PROMOTE(Files, fsp);
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/* Paranoia check. */
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if ((fsp->fh->fd == -1) &&
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(fsp->oplock_type != NO_OPLOCK) &&
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(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
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DEBUG(0,("file_find_dif: file %s file_id = %s, gen = %u \
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oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name,
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file_id_string_tos(&fsp->file_id),
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(unsigned int)fsp->fh->gen_id,
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(unsigned int)fsp->oplock_type ));
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smb_panic("file_find_dif");
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/****************************************************************************
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Check if an fsp still exists.
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****************************************************************************/
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files_struct *file_find_fsp(files_struct *orig_fsp)
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for (fsp=Files;fsp;fsp=fsp->next) {
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/****************************************************************************
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Find the first fsp given a device and inode.
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We use a singleton cache here to speed up searching from getfilepathinfo
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****************************************************************************/
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files_struct *file_find_di_first(struct file_id id)
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if (file_id_equal(&fsp_fi_cache.id, &id)) {
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/* Positive or negative cache hit. */
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return fsp_fi_cache.fsp;
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fsp_fi_cache.id = id;
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for (fsp=Files;fsp;fsp=fsp->next) {
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if (file_id_equal(&fsp->file_id, &id)) {
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/* Setup positive cache. */
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fsp_fi_cache.fsp = fsp;
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/* Setup negative cache. */
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fsp_fi_cache.fsp = NULL;
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/****************************************************************************
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Find the next fsp having the same device and inode.
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****************************************************************************/
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files_struct *file_find_di_next(files_struct *start_fsp)
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for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
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if (file_id_equal(&fsp->file_id, &start_fsp->file_id)) {
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/****************************************************************************
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Find a fsp that is open for printing.
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****************************************************************************/
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files_struct *file_find_print(void)
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for (fsp=Files;fsp;fsp=fsp->next) {
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if (fsp->print_file) {
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/****************************************************************************
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Find any fsp open with a pathname below that of an already open path.
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****************************************************************************/
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bool file_find_subpath(files_struct *dir_fsp)
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char *d_fullname = talloc_asprintf(talloc_tos(),
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dir_fsp->conn->connectpath,
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dlen = strlen(d_fullname);
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for (fsp=Files;fsp;fsp=fsp->next) {
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if (fsp == dir_fsp) {
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d1_fullname = talloc_asprintf(talloc_tos(),
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fsp->conn->connectpath,
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* If the open file has a path that is a longer
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* component, then it's a subpath.
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if (strnequal(d_fullname, d1_fullname, dlen) &&
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(d1_fullname[dlen] == '/')) {
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TALLOC_FREE(d1_fullname);
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TALLOC_FREE(d_fullname);
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TALLOC_FREE(d1_fullname);
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TALLOC_FREE(d_fullname);
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/****************************************************************************
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Sync open files on a connection.
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****************************************************************************/
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void file_sync_all(connection_struct *conn)
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files_struct *fsp, *next;
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for (fsp=Files;fsp;fsp=next) {
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if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
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sync_file(conn, fsp, True /* write through */);
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/****************************************************************************
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****************************************************************************/
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void file_free(struct smb_request *req, files_struct *fsp)
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DLIST_REMOVE(Files, fsp);
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string_free(&fsp->fsp_name);
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TALLOC_FREE(fsp->fake_file_handle);
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if (fsp->fh->ref_count == 1) {
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fsp->fh->ref_count--;
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notify_remove(fsp->conn->notify_ctx, fsp);
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TALLOC_FREE(fsp->notify);
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/* Ensure this event will never fire. */
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TALLOC_FREE(fsp->oplock_timeout);
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/* Ensure this event will never fire. */
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TALLOC_FREE(fsp->update_write_time_event);
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bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
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DEBUG(5,("freed files structure %d (%d used)\n",
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fsp->fnum, files_used));
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fsp->conn->num_files_open--;
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if ((req != NULL) && (fsp == req->chain_fsp)) {
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req->chain_fsp = NULL;
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/* Closing a file can invalidate the positive cache. */
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if (fsp == fsp_fi_cache.fsp) {
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ZERO_STRUCT(fsp_fi_cache);
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/* Drop all remaining extensions. */
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while (fsp->vfs_extension) {
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vfs_remove_fsp_extension(fsp->vfs_extension->owner, fsp);
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/* this is paranoia, just in case someone tries to reuse the
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/****************************************************************************
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Get an fsp from a 16 bit fnum.
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****************************************************************************/
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files_struct *file_fnum(uint16 fnum)
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for (fsp=Files;fsp;fsp=fsp->next, count++) {
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if (fsp->fnum == fnum) {
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DLIST_PROMOTE(Files, fsp);
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/****************************************************************************
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Get an fsp from a packet given the offset of a 16 bit fnum.
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****************************************************************************/
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files_struct *file_fsp(struct smb_request *req, uint16 fid)
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if ((req != NULL) && (req->chain_fsp != NULL)) {
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return req->chain_fsp;
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fsp = file_fnum(fid);
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if ((fsp != NULL) && (req != NULL)) {
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req->chain_fsp = fsp;
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/****************************************************************************
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Duplicate the file handle part for a DOS or FCB open.
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****************************************************************************/
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void dup_file_fsp(struct smb_request *req, files_struct *from,
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uint32 access_mask, uint32 share_access,
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uint32 create_options, files_struct *to)
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to->file_id = from->file_id;
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to->initial_allocation_size = from->initial_allocation_size;
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to->mode = from->mode;
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to->file_pid = from->file_pid;
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to->vuid = from->vuid;
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to->open_time = from->open_time;
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to->access_mask = access_mask;
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to->share_access = share_access;
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to->oplock_type = from->oplock_type;
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to->can_lock = from->can_lock;
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to->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
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if (!CAN_WRITE(from->conn)) {
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to->can_write = False;
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to->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
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to->print_file = from->print_file;
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to->modified = from->modified;
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to->is_directory = from->is_directory;
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to->aio_write_behind = from->aio_write_behind;
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string_set(&to->fsp_name,from->fsp_name);
added
removed
.pc/fix-too-many-open-files.patch/source3/smbd/files.c
