/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
#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;
+static int files_used;
+
+/* A singleton cache to speed up searching by dev/inode. */
+static struct fsp_singleton_cache {
+ files_struct *fsp;
+ struct file_id id;
+} fsp_fi_cache;
+
+/****************************************************************************
+ Return a unique number identifying this fsp over the life of this pid.
+****************************************************************************/
-/*
- * Indirection for file fd's. Needed as POSIX locking
- * is based on file/process, not fd/process.
- */
-static file_fd_struct *FileFd;
+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 )
+
+NTSTATUS file_new(connection_struct *conn, files_struct **result)
{
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;
}
+ /* TODO: Port the id-tree implementation from Samba4 */
+
i = bitmap_find(file_bmap, first_file);
if (i == -1) {
- /*
- * Before we give up, go through the open files
- * and see if there are any files opened with a
- * batch oplock. If so break the oplock and then
- * re-use that entry (if it becomes closed).
- * This may help as NT/95 clients tend to keep
- * files batch oplocked for quite a long time
- * after they have finished with them.
- */
- for (fsp=Files;fsp;fsp=fsp->next) {
- if (attempt_close_oplocked_file(fsp)) {
- return file_new();
- }
- }
-
DEBUG(0,("ERROR! Out of file structures\n"));
- return NULL;
+ /* TODO: We have to unconditionally return a DOS error here,
+ * W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
+ * NTSTATUS negotiated */
+ return NT_STATUS_TOO_MANY_OPENED_FILES;
}
- fsp = (files_struct *)malloc(sizeof(*fsp));
- if (!fsp) return NULL;
+ fsp = SMB_MALLOC_P(files_struct);
+ if (!fsp) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ZERO_STRUCTP(fsp);
- memset(fsp, 0, sizeof(*fsp));
+ fsp->fh = SMB_MALLOC_P(struct fd_handle);
+ if (!fsp->fh) {
+ SAFE_FREE(fsp);
+ return NT_STATUS_NO_MEMORY;
+ }
- first_file = (i+1) % MAX_FNUMS;
+ ZERO_STRUCTP(fsp->fh);
+
+ fsp->fh->ref_count = 1;
+ fsp->fh->fd = -1;
+
+ fsp->conn = conn;
+ fsp->fh->gen_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;
- string_init(&fsp->fsp_name,"");
+ SMB_ASSERT(fsp->fnum < 65536);
+
+ string_set(&fsp->fsp_name,"");
- /* hook into the front of the list */
- if (!Files) {
- Files = fsp;
- } else {
- Files->prev = fsp;
- fsp->next = Files;
- Files = fsp;
- }
+ 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;
-}
+ /* A new fsp invalidates a negative fsp_fi_cache. */
+ if (fsp_fi_cache.fsp == NULL) {
+ ZERO_STRUCT(fsp_fi_cache);
+ }
+ *result = fsp;
+ return NT_STATUS_OK;
+}
/****************************************************************************
-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(struct stat *sbuf)
+
+void file_close_conn(connection_struct *conn)
{
- 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) &&
- (((uint32)sbuf->st_dev) == fd_ptr->dev) &&
- (((uint32)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;
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next = fsp->next;
+ if (fsp->conn == conn) {
+ close_file(fsp,SHUTDOWN_CLOSE);
}
}
-
- return NULL;
}
+/****************************************************************************
+ Close all open files for a pid and a vuid.
+****************************************************************************/
+void file_close_pid(uint16 smbpid, int vuid)
+{
+ files_struct *fsp, *next;
+
+ for (fsp=Files;fsp;fsp=next) {
+ next = fsp->next;
+ if ((fsp->file_pid == smbpid) && (fsp->vuid == vuid)) {
+ close_file(fsp,SHUTDOWN_CLOSE);
+ }
+ }
+}
/****************************************************************************
-fd support routines - attempt to find a empty slot in the FileFd array.
-Increments the ref_count of the returned entry.
+ Initialise file structures.
****************************************************************************/
-file_fd_struct *fd_get_new(void)
+
+#define MAX_OPEN_FUDGEFACTOR 20
+
+void file_init(void)
{
- extern struct current_user current_user;
- int i;
- file_fd_struct *fd_ptr;
+ int request_max_open_files = lp_max_open_files();
+ int real_lim;
- i = bitmap_find(fd_bmap, 1);
- if (i == -1) {
- DEBUG(0,("ERROR! Out of file_fd structures\n"));
- return NULL;
+ /*
+ * 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));
}
- fd_ptr = (file_fd_struct *)malloc(sizeof(*fd_ptr));
- if (!fd_ptr) return NULL;
-
- memset(fd_ptr, 0, sizeof(*fd_ptr));
+ SMB_ASSERT(real_max_open_files > 100);
+
+ file_bmap = bitmap_allocate(real_max_open_files);
- fd_ptr->fdnum = i;
- fd_ptr->dev = (uint32)-1;
- fd_ptr->inode = (uint32)-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++;
-
- /* hook into the front of the list */
- if (!FileFd) {
- FileFd = fd_ptr;
- } else {
- FileFd->prev = fd_ptr;
- fd_ptr->next = FileFd;
- FileFd = fd_ptr;
+ 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);
+}
- DEBUG(5,("allocated fd_ptr structure %d (%d used)\n",
- i, fd_ptr_used));
+/****************************************************************************
+ Close files open by a specified vuid.
+****************************************************************************/
- return fd_ptr;
+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,SHUTDOWN_CLOSE);
+ }
+ }
}
+/****************************************************************************
+ 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, gen = %lu, fileid=%s\n",
+ count, fsp->fnum, fsp->fsp_name, fsp->fh->fd, (unsigned long)fsp->fh->gen_id,
+ file_id_static_string(&fsp->file_id)));
+ }
+}
/****************************************************************************
-close all open files for a connection
+ Find a fsp given a file descriptor.
****************************************************************************/
-void file_close_conn(connection_struct *conn)
+
+files_struct *file_find_fd(int fd)
{
+ int count=0;
files_struct *fsp;
-
- for (fsp=Files;fsp;fsp=fsp->next) {
- if (fsp->conn == conn && fsp->open) {
- if (fsp->is_directory)
- close_directory(fsp);
- else
- close_file(fsp,False);
+
+ for (fsp=Files;fsp;fsp=fsp->next,count++) {
+ if (fsp->fh->fd == fd) {
+ if (count > 10) {
+ DLIST_PROMOTE(Files, fsp);
+ }
+ return fsp;
}
}
+
+ return NULL;
}
/****************************************************************************
-initialise file structures
+ Find a fsp given a device, inode and file_id.
****************************************************************************/
-void file_init(void)
+
+files_struct *file_find_dif(struct file_id id, unsigned long gen_id)
{
- file_bmap = bitmap_allocate(MAX_FNUMS);
- fd_bmap = bitmap_allocate(MAX_FNUMS);
+ int count=0;
+ files_struct *fsp;
- if (!file_bmap || !fd_bmap) {
- exit_server("out of memory in file_init");
+ 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 (file_id_equal(&fsp->file_id, &id) &&
+ fsp->fh->gen_id == gen_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 file_id = %s, gen = %u \
+oplock_type = %u is a stat open with oplock type !\n", fsp->fsp_name,
+ file_id_static_string(&fsp->file_id),
+ (unsigned int)fsp->fh->gen_id,
+ (unsigned int)fsp->oplock_type ));
+ smb_panic("file_find_dif");
+ }
+ return fsp;
+ }
}
-#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));
- }
-#endif
+ return NULL;
}
-
/****************************************************************************
-close files open by a specified vuid
+ Check if an fsp still exists.
****************************************************************************/
-void file_close_user(int vuid)
+
+files_struct *file_find_fsp(files_struct *orig_fsp)
{
files_struct *fsp;
for (fsp=Files;fsp;fsp=fsp->next) {
- if ((fsp->vuid == vuid) && fsp->open) {
- if(!fsp->is_directory)
- close_file(fsp,False);
- else
- close_directory(fsp);
- }
+ if (fsp == orig_fsp)
+ return fsp;
}
-}
+ return NULL;
+}
/****************************************************************************
-find a fsp given a device, inode and timevalue
+ 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_dit(int dev, int inode, struct timeval *tval)
+
+files_struct *file_find_di_first(struct file_id id)
{
files_struct *fsp;
+ if (file_id_equal(&fsp_fi_cache.id, &id)) {
+ /* Positive or negative cache hit. */
+ return fsp_fi_cache.fsp;
+ }
+
+ fsp_fi_cache.id = id;
+
for (fsp=Files;fsp;fsp=fsp->next) {
- 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->fh->fd != -1 &&
+ file_id_equal(&fsp->file_id, &id)) {
+ /* Setup positive cache. */
+ fsp_fi_cache.fsp = fsp;
return fsp;
}
}
+ /* Setup negative cache. */
+ fsp_fi_cache.fsp = NULL;
return NULL;
}
-
/****************************************************************************
-find a fsp that is open for printing
+ Find the next fsp having the same device and inode.
****************************************************************************/
-files_struct *file_find_print(void)
+
+files_struct *file_find_di_next(files_struct *start_fsp)
{
files_struct *fsp;
- for (fsp=Files;fsp;fsp=fsp->next) {
- if (fsp->open && fsp->print_file) return fsp;
- }
+ for (fsp = start_fsp->next;fsp;fsp=fsp->next) {
+ if ( fsp->fh->fd != -1 &&
+ file_id_equal(&fsp->file_id, &start_fsp->file_id)) {
+ return fsp;
+ }
+ }
+
return NULL;
}
-
/****************************************************************************
-sync open files on a connection
+ Find a fsp that is open for printing.
****************************************************************************/
-void file_sync_all(connection_struct *conn)
+
+files_struct *file_find_print(void)
{
files_struct *fsp;
for (fsp=Files;fsp;fsp=fsp->next) {
- if (fsp->open && conn == fsp->conn) {
- sync_file(conn,fsp);
+ if (fsp->print_file) {
+ return fsp;
}
- }
-}
+ }
+ return NULL;
+}
/****************************************************************************
-free up a fd_ptr
+ Set a pending modtime across all files with a given dev/ino pair.
+ Record the owner of that modtime.
****************************************************************************/
-static void fd_ptr_free(file_fd_struct *fd_ptr)
+
+void fsp_set_pending_modtime(files_struct *tfsp, const struct timespec mod)
{
- if (fd_ptr == FileFd) {
- FileFd = fd_ptr->next;
- if (FileFd) FileFd->prev = NULL;
- } else {
- fd_ptr->prev->next = fd_ptr->next;
- if (fd_ptr->next) fd_ptr->next->prev = fd_ptr->prev;
+ files_struct *fsp;
+
+ if (null_timespec(mod)) {
+ return;
}
- bitmap_clear(fd_bmap, fd_ptr->fdnum);
- fd_ptr_used--;
+ for (fsp = Files;fsp;fsp=fsp->next) {
+ if ( fsp->fh->fd != -1 && file_id_equal(&fsp->file_id, &tfsp->file_id)) {
+ fsp->pending_modtime = mod;
+ fsp->pending_modtime_owner = False;
+ }
+ }
- DEBUG(5,("freed fd_ptr structure %d (%d used)\n",
- fd_ptr->fdnum, fd_ptr_used));
+ tfsp->pending_modtime_owner = True;
+}
- /* paranoia */
- memset(fd_ptr, 0, sizeof(*fd_ptr));
+/****************************************************************************
+ Sync open files on a connection.
+****************************************************************************/
- free(fd_ptr);
-}
+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
+ Free up a fsp.
****************************************************************************/
+
void file_free(files_struct *fsp)
{
- if (fsp == Files) {
- Files = fsp->next;
- if (Files) Files->prev = NULL;
- } else {
- fsp->prev->next = fsp->next;
- if (fsp->next) fsp->next->prev = fsp->prev;
- }
+ 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);
+ 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--;
+ }
+
+ if (fsp->notify) {
+ notify_remove(fsp->conn->notify_ctx, fsp);
+ TALLOC_FREE(fsp->notify);
}
+ /* Ensure this event will never fire. */
+ TALLOC_FREE(fsp->oplock_timeout);
+
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;
+ if (fsp == chain_fsp) {
+ chain_fsp = NULL;
+ }
- free(fsp);
-}
+ /* 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
+ Get an fsp from a 16 bit fnum.
****************************************************************************/
-files_struct *file_fsp(char *buf, int where)
+
+files_struct *file_fnum(uint16 fnum)
{
- int fnum;
files_struct *fsp;
+ int count=0;
- if (chain_fsp) return chain_fsp;
-
- fnum = SVAL(buf, where);
-
- for (fsp=Files;fsp;fsp=fsp->next) {
+ 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;
}
+/****************************************************************************
+ Get an fsp from a packet given the offset of a 16 bit fnum.
+****************************************************************************/
+
+files_struct *file_fsp(char *buf, int where)
+{
+ files_struct *fsp;
+
+ if (chain_fsp) {
+ return chain_fsp;
+ }
+
+ if (!buf) {
+ return NULL;
+ }
+
+ fsp = file_fnum(SVAL(buf, where));
+ if (fsp) {
+ chain_fsp = fsp;
+ }
+ return fsp;
+}
/****************************************************************************
-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)
{
chain_fsp = NULL;
}
+
+/****************************************************************************
+ Duplicate the file handle part for a DOS or FCB open.
+****************************************************************************/
+
+NTSTATUS dup_file_fsp(files_struct *fsp,
+ uint32 access_mask,
+ uint32 share_access,
+ uint32 create_options,
+ files_struct **result)
+{
+ NTSTATUS status;
+ files_struct *dup_fsp;
+
+ status = file_new(fsp->conn, &dup_fsp);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ SAFE_FREE(dup_fsp->fh);
+
+ dup_fsp->fh = fsp->fh;
+ dup_fsp->fh->ref_count++;
+
+ dup_fsp->file_id = fsp->file_id;
+ 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;
+ string_set(&dup_fsp->fsp_name,fsp->fsp_name);
+
+ *result = dup_fsp;
+ return NT_STATUS_OK;
+}
git.samba.org / jra / samba / .git / blobdiff