--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Files[] structure handling
+ 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"
+
+static int real_max_open_files;
+
+#define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
+
+#define FILE_HANDLE_OFFSET 0x1000
+
+static struct bitmap *file_bmap;
+
+static files_struct *Files;
+
+/* a fsp to use when chaining */
+static files_struct *chain_fsp = NULL;
+/* a fsp to use to save when breaking an oplock. */
+static files_struct *oplock_save_chain_fsp = NULL;
+
+static int files_used;
+
+/* A singleton cache to speed up searching by dev/inode. */
+static struct fsp_singleton_cache {
+ files_struct *fsp;
+ SMB_DEV_T dev;
+ SMB_INO_T inode;
+} fsp_fi_cache;
+
+/****************************************************************************
+ Return a unique number identifying this fsp over the life of this pid.
+****************************************************************************/
+
+static unsigned long get_gen_count(void)
+{
+ static unsigned long file_gen_counter;
+
+ if ((++file_gen_counter) == 0)
+ return ++file_gen_counter;
+ return file_gen_counter;
+}
+
+/****************************************************************************
+ Find first available file slot.
+****************************************************************************/
+
+files_struct *file_new(connection_struct *conn)
+{
+ int i;
+ static int first_file;
+ files_struct *fsp;
+
+ /* we want to give out file handles differently on each new
+ connection because of a common bug in MS clients where they try to
+ reuse a file descriptor from an earlier smb connection. This code
+ increases the chance that the errant client will get an error rather
+ than causing corruption */
+ if (first_file == 0) {
+ first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
+ }
+
+ /* TODO: Port the id-tree implementation from Samba4 */
+
+ i = bitmap_find(file_bmap, first_file);
+ if (i == -1) {
+ DEBUG(0,("ERROR! Out of file structures\n"));
+ /* TODO: We have to unconditionally return a DOS error here,
+ * W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
+ * NTSTATUS negotiated */
+ set_saved_ntstatus(NT_STATUS_TOO_MANY_OPENED_FILES);
+ return NULL;
+ }
+
+ fsp = SMB_MALLOC_P(files_struct);
+ if (!fsp) {
+ set_saved_ntstatus(NT_STATUS_NO_MEMORY);
+ return NULL;
+ }
+
+ ZERO_STRUCTP(fsp);
+
+ fsp->fh = SMB_MALLOC_P(struct fd_handle);
+ if (!fsp->fh) {
+ SAFE_FREE(fsp);
+ set_saved_ntstatus(NT_STATUS_NO_MEMORY);
+ return NULL;
+ }
+
+ ZERO_STRUCTP(fsp->fh);
+
+ fsp->fh->ref_count = 1;
+ fsp->fh->fd = -1;
+
+ fsp->conn = conn;
+ fsp->file_id = get_gen_count();
+ GetTimeOfDay(&fsp->open_time);
+
+ first_file = (i+1) % real_max_open_files;
+
+ bitmap_set(file_bmap, i);
+ files_used++;
+
+ fsp->fnum = i + FILE_HANDLE_OFFSET;
+ SMB_ASSERT(fsp->fnum < 65536);
+
+ string_set(&fsp->fsp_name,"");
+
+ DLIST_ADD(Files, fsp);
+
+ DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
+ i, fsp->fnum, files_used));
+
+ chain_fsp = fsp;
+
+ /* A new fsp invalidates a negative fsp_fi_cache. */
+ if (fsp_fi_cache.fsp == NULL) {
+ ZERO_STRUCT(fsp_fi_cache);
+ }
+
+ return fsp;
+}
+
+/****************************************************************************
+ Close all open files for a connection.
+****************************************************************************/
+
+void file_close_conn(connection_struct *conn)
+{
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next = fsp->next;
+ if (fsp->conn == conn) {
+ close_file(fsp,False);
+ }
+ }
+}
+
+/****************************************************************************
+ Close all open files for a pid.
+****************************************************************************/
+
+void file_close_pid(uint16 smbpid)
+{
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next = fsp->next;
+ if (fsp->file_pid == smbpid) {
+ close_file(fsp,False);
+ }
+ }
+}
+
+/****************************************************************************
+ Initialise file structures.
+****************************************************************************/
+
+#define MAX_OPEN_FUDGEFACTOR 20
+
+void file_init(void)
+{
+ int request_max_open_files = lp_max_open_files();
+ int real_lim;
+
+ /*
+ * Set the max_open files to be the requested
+ * max plus a fudgefactor to allow for the extra
+ * fd's we need such as log files etc...
+ */
+ real_lim = set_maxfiles(request_max_open_files + MAX_OPEN_FUDGEFACTOR);
+
+ real_max_open_files = real_lim - MAX_OPEN_FUDGEFACTOR;
+
+ if (real_max_open_files + FILE_HANDLE_OFFSET + MAX_OPEN_PIPES > 65536)
+ real_max_open_files = 65536 - FILE_HANDLE_OFFSET - MAX_OPEN_PIPES;
+
+ if(real_max_open_files != request_max_open_files) {
+ DEBUG(1,("file_init: Information only: requested %d \
+open files, %d are available.\n", request_max_open_files, real_max_open_files));
+ }
+
+ SMB_ASSERT(real_max_open_files > 100);
+
+ file_bmap = bitmap_allocate(real_max_open_files);
+
+ if (!file_bmap) {
+ exit_server("out of memory in file_init");
+ }
+
+ /*
+ * Ensure that pipe_handle_oppset is set correctly.
+ */
+ set_pipe_handle_offset(real_max_open_files);
+}
+
+/****************************************************************************
+ Close files open by a specified vuid.
+****************************************************************************/
+
+void file_close_user(int vuid)
+{
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next=fsp->next;
+ if (fsp->vuid == vuid) {
+ close_file(fsp,False);
+ }
+ }
+}
+
+/****************************************************************************
+ Debug to enumerate all open files in the smbd.
+****************************************************************************/
+
+void file_dump_open_table(void)
+{
+ int count=0;
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next,count++) {
+ DEBUG(10,("Files[%d], fnum = %d, name %s, fd = %d, fileid = %lu, dev = %x, inode = %.0f\n",
+ count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->file_id,
+ (unsigned int)fsp->dev, (double)fsp->inode ));
+ }
+}
+
+/****************************************************************************
+ Find a fsp given a file descriptor.
+****************************************************************************/
+
+files_struct *file_find_fd(int fd)
+{
+ int count=0;
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next,count++) {
+ if (fsp->fh->fd == fd) {
+ if (count > 10) {
+ DLIST_PROMOTE(Files, fsp);
+ }
+ return fsp;
+ }
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Find a fsp given a device, inode and file_id.
+****************************************************************************/
+
+files_struct *file_find_dif(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
+{
+ int count=0;
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next,count++) {
+ /* We can have a fsp->fh->fd == -1 here as it could be a stat open. */
+ if (fsp->dev == dev &&
+ fsp->inode == inode &&
+ fsp->file_id == file_id ) {
+ if (count > 10) {
+ DLIST_PROMOTE(Files, fsp);
+ }
+ /* Paranoia check. */
+ if ((fsp->fh->fd == -1) &&
+ (fsp->oplock_type != NO_OPLOCK) &&
+ (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK)) {
+ DEBUG(0,("file_find_dif: file %s dev = %x, inode = %.0f, file_id = %u \
+oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name, (unsigned int)fsp->dev,
+ (double)fsp->inode, (unsigned int)fsp->file_id,
+ (unsigned int)fsp->oplock_type ));
+ smb_panic("file_find_dif\n");
+ }
+ return fsp;
+ }
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Check if an fsp still exists.
+****************************************************************************/
+
+files_struct *file_find_fsp(files_struct *orig_fsp)
+{
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next) {
+ if (fsp == orig_fsp)
+ return fsp;
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Find the first fsp given a device and inode.
+ We use a singleton cache here to speed up searching from getfilepathinfo
+ calls.
+****************************************************************************/
+
+files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
+{
+ files_struct *fsp;
+
+ if (fsp_fi_cache.dev == dev && fsp_fi_cache.inode == inode) {
+ /* Positive or negative cache hit. */
+ return fsp_fi_cache.fsp;
+ }
+
+ fsp_fi_cache.dev = dev;
+ fsp_fi_cache.inode = inode;
+
+ for (fsp=Files;fsp;fsp=fsp->next) {
+ if ( fsp->fh->fd != -1 &&
+ fsp->dev == dev &&
+ fsp->inode == inode ) {
+ /* Setup positive cache. */
+ fsp_fi_cache.fsp = fsp;
+ return fsp;
+ }
+ }
+
+ /* Setup negative cache. */
+ fsp_fi_cache.fsp = NULL;
+ return NULL;
+}
+
+/****************************************************************************
+ Find the next fsp having the same device and inode.
+****************************************************************************/
+
+files_struct *file_find_di_next(files_struct *start_fsp)
+{
+ files_struct *fsp;
+
+ for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
+ if ( fsp->fh->fd != -1 &&
+ fsp->dev == start_fsp->dev &&
+ fsp->inode == start_fsp->inode )
+ return fsp;
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Find a fsp that is open for printing.
+****************************************************************************/
+
+files_struct *file_find_print(void)
+{
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next) {
+ if (fsp->print_file) {
+ return fsp;
+ }
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Set a pending modtime across all files with a given dev/ino pair.
+ Record the owner of that modtime.
+****************************************************************************/
+
+void fsp_set_pending_modtime(files_struct *tfsp, time_t pmod)
+{
+ files_struct *fsp;
+
+ if (null_mtime(pmod)) {
+ return;
+ }
+
+ for (fsp = Files;fsp;fsp=fsp->next) {
+ if ( fsp->fh->fd != -1 &&
+ fsp->dev == tfsp->dev &&
+ fsp->inode == tfsp->inode ) {
+ fsp->pending_modtime = pmod;
+ fsp->pending_modtime_owner = False;
+ }
+ }
+
+ tfsp->pending_modtime_owner = True;
+}
+
+/****************************************************************************
+ Sync open files on a connection.
+****************************************************************************/
+
+void file_sync_all(connection_struct *conn)
+{
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next=fsp->next;
+ if ((conn == fsp->conn) && (fsp->fh->fd != -1)) {
+ sync_file(conn, fsp, True /* write through */);
+ }
+ }
+}
+
+/****************************************************************************
+ Free up a fsp.
+****************************************************************************/
+
+void file_free(files_struct *fsp)
+{
+ DLIST_REMOVE(Files, fsp);
+
+ string_free(&fsp->fsp_name);
+
+ if (fsp->fake_file_handle) {
+ destroy_fake_file_handle(&fsp->fake_file_handle);
+ }
+
+ if (fsp->fh->ref_count == 1) {
+ SAFE_FREE(fsp->fh);
+ } else {
+ fsp->fh->ref_count--;
+ }
+
+ bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
+ files_used--;
+
+ DEBUG(5,("freed files structure %d (%d used)\n",
+ fsp->fnum, files_used));
+
+ /* this is paranoia, just in case someone tries to reuse the
+ information */
+ ZERO_STRUCTP(fsp);
+
+ if (fsp == chain_fsp) {
+ chain_fsp = NULL;
+ }
+
+ /* Closing a file can invalidate the positive cache. */
+ if (fsp == fsp_fi_cache.fsp) {
+ ZERO_STRUCT(fsp_fi_cache);
+ }
+
+ SAFE_FREE(fsp);
+}
+
+/****************************************************************************
+ Get a fsp from a packet given the offset of a 16 bit fnum.
+****************************************************************************/
+
+files_struct *file_fsp(char *buf, int where)
+{
+ int fnum, count=0;
+ files_struct *fsp;
+
+ if (chain_fsp)
+ return chain_fsp;
+
+ if (!buf)
+ return NULL;
+ fnum = SVAL(buf, where);
+
+ for (fsp=Files;fsp;fsp=fsp->next, count++) {
+ if (fsp->fnum == fnum) {
+ chain_fsp = fsp;
+ if (count > 10) {
+ DLIST_PROMOTE(Files, fsp);
+ }
+ return fsp;
+ }
+ }
+ return NULL;
+}
+
+/****************************************************************************
+ Reset the chained fsp - done at the start of a packet reply.
+****************************************************************************/
+
+void file_chain_reset(void)
+{
+ chain_fsp = NULL;
+}
+
+/****************************************************************************
+ Save the chained fsp - done when about to do an oplock break.
+****************************************************************************/
+
+void file_chain_save(void)
+{
+ oplock_save_chain_fsp = chain_fsp;
+}
+
+/****************************************************************************
+ Restore the chained fsp - done after an oplock break.
+****************************************************************************/
+
+void file_chain_restore(void)
+{
+ chain_fsp = oplock_save_chain_fsp;
+}
+
+/****************************************************************************
+ Duplicate the file handle part for a DOS or FCB open.
+****************************************************************************/
+
+files_struct *dup_file_fsp(files_struct *fsp,
+ uint32 access_mask,
+ uint32 share_access,
+ uint32 create_options)
+{
+ files_struct *dup_fsp = file_new(fsp->conn);
+
+ if (!dup_fsp) {
+ return NULL;
+ }
+
+ SAFE_FREE(dup_fsp->fh);
+
+ dup_fsp->fh = fsp->fh;
+ dup_fsp->fh->ref_count++;
+
+ dup_fsp->dev = fsp->dev;
+ dup_fsp->inode = fsp->inode;
+ dup_fsp->initial_allocation_size = fsp->initial_allocation_size;
+ dup_fsp->mode = fsp->mode;
+ dup_fsp->file_pid = fsp->file_pid;
+ dup_fsp->vuid = fsp->vuid;
+ dup_fsp->open_time = fsp->open_time;
+ dup_fsp->access_mask = access_mask;
+ dup_fsp->share_access = share_access;
+ dup_fsp->pending_modtime_owner = fsp->pending_modtime_owner;
+ dup_fsp->pending_modtime = fsp->pending_modtime;
+ dup_fsp->last_write_time = fsp->last_write_time;
+ dup_fsp->oplock_type = fsp->oplock_type;
+ dup_fsp->can_lock = fsp->can_lock;
+ dup_fsp->can_read = (access_mask & (FILE_READ_DATA)) ? True : False;
+ if (!CAN_WRITE(fsp->conn)) {
+ dup_fsp->can_write = False;
+ } else {
+ dup_fsp->can_write = (access_mask & (FILE_WRITE_DATA | FILE_APPEND_DATA)) ? True : False;
+ }
+ dup_fsp->print_file = fsp->print_file;
+ dup_fsp->modified = fsp->modified;
+ dup_fsp->is_directory = fsp->is_directory;
+ dup_fsp->is_stat = fsp->is_stat;
+ dup_fsp->aio_write_behind = fsp->aio_write_behind;
+ string_set(&dup_fsp->fsp_name,fsp->fsp_name);
+
+ return dup_fsp;
+}
projects / samba / blobdiff