/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
Files[] structure handling
Copyright (C) Andrew Tridgell 1998
#include "includes.h"
-extern int DEBUGLEVEL;
+static int real_max_open_files;
-/* the only restriction is that this must be less than PIPE_HANDLE_OFFSET */
-#define MAX_FNUMS 4096
-
-#define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < MAX_FNUMS))
+#define VALID_FNUM(fnum) (((fnum) >= 0) && ((fnum) < real_max_open_files))
#define FILE_HANDLE_OFFSET 0x1000
static struct bitmap *file_bmap;
-static struct bitmap *fd_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;
-/*
- * Indirection for file fd's. Needed as POSIX locking
- * is based on file/process, not fd/process.
- */
-static file_fd_struct *FileFd;
+static int files_used;
+
+/****************************************************************************
+ 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;
-static int files_used, fd_ptr_used;
+ if ((++file_gen_counter) == 0)
+ return ++file_gen_counter;
+ return file_gen_counter;
+}
/****************************************************************************
- find first available file slot
+ Find first available file slot.
****************************************************************************/
-files_struct *file_new(void )
+
+files_struct *file_new(connection_struct *conn)
{
int i;
static int first_file;
increases the chance that the errant client will get an error rather
than causing corruption */
if (first_file == 0) {
- first_file = (getpid() ^ (int)time(NULL)) % MAX_FNUMS;
+ first_file = (sys_getpid() ^ (int)time(NULL)) % real_max_open_files;
}
i = bitmap_find(file_bmap, first_file);
for (fsp=Files;fsp;fsp=next) {
next=fsp->next;
if (attempt_close_oplocked_file(fsp)) {
- return file_new();
+ return file_new(conn);
}
}
DEBUG(0,("ERROR! Out of file structures\n"));
+ unix_ERR_class = ERRSRV;
+ unix_ERR_code = ERRnofids;
return NULL;
}
fsp = (files_struct *)malloc(sizeof(*fsp));
- if (!fsp) return NULL;
+ if (!fsp) {
+ unix_ERR_class = ERRSRV;
+ unix_ERR_code = ERRnofids;
+ return NULL;
+ }
- memset(fsp, 0, sizeof(*fsp));
+ ZERO_STRUCTP(fsp);
+ fsp->fd = -1;
+ fsp->conn = conn;
+ fsp->file_id = get_gen_count();
+ GetTimeOfDay(&fsp->open_time);
- first_file = (i+1) % MAX_FNUMS;
+ first_file = (i+1) % real_max_open_files;
bitmap_set(file_bmap, i);
files_used++;
fsp->fnum = i + FILE_HANDLE_OFFSET;
- string_init(&fsp->fsp_name,"");
+ string_set(&fsp->fsp_name,"");
DLIST_ADD(Files, fsp);
- DEBUG(5,("allocated file structure %d (%d used)\n",
- i, files_used));
+ DEBUG(5,("allocated file structure %d, fnum = %d (%d used)\n",
+ i, fsp->fnum, files_used));
chain_fsp = fsp;
return fsp;
}
-
-
/****************************************************************************
-fd support routines - attempt to find an already open file by dev
-and inode - increments the ref_count of the returned file_fd_struct *.
+ Close all open files for a connection.
****************************************************************************/
-file_fd_struct *fd_get_already_open(SMB_STRUCT_STAT *sbuf)
-{
- file_fd_struct *fd_ptr;
-
- if(!sbuf) return NULL;
-
- for (fd_ptr=FileFd;fd_ptr;fd_ptr=fd_ptr->next) {
- if ((fd_ptr->ref_count > 0) &&
- (sbuf->st_dev == fd_ptr->dev) &&
- (sbuf->st_ino == fd_ptr->inode)) {
- fd_ptr->ref_count++;
- DEBUG(3,("Re-used file_fd_struct dev = %x, inode = %x, ref_count = %d\n",
- fd_ptr->dev, fd_ptr->inode,
- fd_ptr->ref_count));
- return fd_ptr;
- }
- }
-
- return NULL;
-}
-
-
-
-/****************************************************************************
-fd support routines - attempt to find a empty slot in the FileFd array.
-Increments the ref_count of the returned entry.
-****************************************************************************/
-file_fd_struct *fd_get_new(void)
-{
- extern struct current_user current_user;
- int i;
- file_fd_struct *fd_ptr;
- i = bitmap_find(fd_bmap, 1);
- if (i == -1) {
- DEBUG(0,("ERROR! Out of file_fd structures\n"));
- return NULL;
- }
-
- fd_ptr = (file_fd_struct *)malloc(sizeof(*fd_ptr));
- if (!fd_ptr) return NULL;
-
- memset(fd_ptr, 0, sizeof(*fd_ptr));
-
- fd_ptr->fdnum = i;
- fd_ptr->dev = (SMB_DEV_T)-1;
- fd_ptr->inode = (SMB_INO_T)-1;
- fd_ptr->fd = -1;
- fd_ptr->fd_readonly = -1;
- fd_ptr->fd_writeonly = -1;
- fd_ptr->real_open_flags = -1;
- fd_add_to_uid_cache(fd_ptr, (uid_t)current_user.uid);
- fd_ptr->ref_count++;
-
- bitmap_set(fd_bmap, i);
- fd_ptr_used++;
-
- DLIST_ADD(FileFd, fd_ptr);
-
- DEBUG(5,("allocated fd_ptr structure %d (%d used)\n",
- i, fd_ptr_used));
-
- return fd_ptr;
-}
-
-
-/****************************************************************************
-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 && fsp->open) {
- if (fsp->is_directory)
- close_directory(fsp);
- else
- close_file(fsp,False);
+ if (fsp->conn == conn) {
+ close_file(fsp,False);
}
}
}
/****************************************************************************
-initialise file structures
+ Initialise file structures.
****************************************************************************/
+
+#define MAX_OPEN_FUDGEFACTOR 10
+
void file_init(void)
{
- file_bmap = bitmap_allocate(MAX_FNUMS);
- fd_bmap = bitmap_allocate(MAX_FNUMS);
+ int request_max_open_files = lp_max_open_files();
+ int real_lim;
- if (!file_bmap || !fd_bmap) {
- exit_server("out of memory in file_init");
+ /*
+ * 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 != 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));
}
-#if (defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE))
- {
- struct rlimit rlp;
- getrlimit(RLIMIT_NOFILE, &rlp);
- /* Set the fd limit to be MAX_FNUMS + 10 to
- * account for the extra fd we need
- * as well as the log files and standard
- * handles etc. */
- rlp.rlim_cur = (MAX_FNUMS+10>rlp.rlim_max)?
- rlp.rlim_max:MAX_FNUMS+10;
- setrlimit(RLIMIT_NOFILE, &rlp);
- getrlimit(RLIMIT_NOFILE, &rlp);
- DEBUG(3,("Maximum number of open files per session is %d\n",
- (int)rlp.rlim_cur));
+ file_bmap = bitmap_allocate(real_max_open_files);
+
+ if (!file_bmap) {
+ exit_server("out of memory in file_init");
}
-#endif
+
+ /*
+ * Ensure that pipe_handle_oppset is set correctly.
+ */
+ set_pipe_handle_offset(real_max_open_files);
}
-
/****************************************************************************
-close files open by a specified vuid
+ 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) && fsp->open) {
- if(!fsp->is_directory)
- close_file(fsp,False);
- else
- close_directory(fsp);
+ if (fsp->vuid == vuid) {
+ close_file(fsp,False);
}
}
}
+/****************************************************************************
+ 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->fd == fd) {
+ if (count > 10) {
+ DLIST_PROMOTE(Files, fsp);
+ }
+ return fsp;
+ }
+ }
+
+ return NULL;
+}
/****************************************************************************
-find a fsp given a device, inode and timevalue
+ Find a fsp given a device, inode and file_id.
****************************************************************************/
-files_struct *file_find_dit(SMB_DEV_T dev, SMB_INO_T inode, struct timeval *tval)
+
+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++) {
- if (fsp->open &&
- fsp->fd_ptr->dev == dev &&
- fsp->fd_ptr->inode == inode &&
- fsp->open_time.tv_sec == tval->tv_sec &&
- fsp->open_time.tv_usec == tval->tv_usec) {
+ if (fsp->fd != -1 &&
+ fsp->dev == dev &&
+ fsp->inode == inode &&
+ fsp->file_id == file_id ) {
if (count > 10) {
DLIST_PROMOTE(Files, 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.
+****************************************************************************/
+
+files_struct *file_find_di_first(SMB_DEV_T dev, SMB_INO_T inode)
+{
+ files_struct *fsp;
+
+ for (fsp=Files;fsp;fsp=fsp->next) {
+ if ( fsp->fd != -1 &&
+ fsp->dev == dev &&
+ fsp->inode == inode )
+ return fsp;
+ }
+
+ 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->fd != -1 &&
+ fsp->dev == start_fsp->dev &&
+ fsp->inode == start_fsp->inode )
+ return fsp;
+ }
+
+ return NULL;
+}
/****************************************************************************
-find a fsp that is open for printing
+ 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->open && fsp->print_file) return fsp;
+ if (fsp->print_file) return fsp;
}
+
return NULL;
}
-
/****************************************************************************
-sync open files on a connection
+ 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 (fsp->open && conn == fsp->conn) {
+ if ((conn == fsp->conn) && (fsp->fd != -1)) {
sync_file(conn,fsp);
}
}
}
-
/****************************************************************************
-free up a fd_ptr
+ Free up a fsp.
****************************************************************************/
-static void fd_ptr_free(file_fd_struct *fd_ptr)
-{
- DLIST_REMOVE(FileFd, fd_ptr);
- bitmap_clear(fd_bmap, fd_ptr->fdnum);
- fd_ptr_used--;
-
- DEBUG(5,("freed fd_ptr structure %d (%d used)\n",
- fd_ptr->fdnum, fd_ptr_used));
-
- /* paranoia */
- memset(fd_ptr, 0, sizeof(*fd_ptr));
-
- free(fd_ptr);
-}
-
-
-/****************************************************************************
-free up a fsp
-****************************************************************************/
void file_free(files_struct *fsp)
{
DLIST_REMOVE(Files, fsp);
string_free(&fsp->fsp_name);
- if (fsp->fd_ptr && fsp->fd_ptr->ref_count == 0) {
- fd_ptr_free(fsp->fd_ptr);
- }
-
bitmap_clear(file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
files_used--;
/* this is paranoia, just in case someone tries to reuse the
information */
- memset(fsp, 0, sizeof(*fsp));
+ ZERO_STRUCTP(fsp);
if (fsp == chain_fsp) chain_fsp = NULL;
- free(fsp);
+ SAFE_FREE(fsp);
}
-
/****************************************************************************
-get a fsp from a packet given the offset of a 16 bit fnum
+ 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 (chain_fsp)
+ return chain_fsp;
fnum = SVAL(buf, where);
return fsp;
}
}
-
return NULL;
}
/****************************************************************************
- Reset the chained fsp - done at the start of a packet reply
+ Reset the chained fsp - done at the start of a packet reply.
****************************************************************************/
void file_chain_reset(void)
/****************************************************************************
Restore the chained fsp - done after an oplock break.
****************************************************************************/
+
void file_chain_restore(void)
{
chain_fsp = oplock_save_chain_fsp;
git.samba.org / samba.git / blobdiff