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|
/*
Unix SMB/Netbios implementation.
Version 3.0
Locking functions
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Jeremy Allison 1992-2000
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.
Revision History:
12 aug 96: Erik.Devriendt@te6.siemens.be
added support for shared memory implementation of share mode locking
May 1997. Jeremy Allison (jallison@whistle.com). Modified share mode
locking to deal with multiple share modes per open file.
September 1997. Jeremy Allison (jallison@whistle.com). Added oplock
support.
rewrtten completely to use new tdb code. Tridge, Dec '99
Added POSIX locking support. Jeremy Allison (jeremy@valinux.com), Apr. 2000.
*/
#include "includes.h"
extern int DEBUGLEVEL;
uint16 global_smbpid;
/* the locking database handle */
static TDB_CONTEXT *tdb;
/****************************************************************************
Debugging aid :-).
****************************************************************************/
static const char *lock_type_name(enum brl_type lock_type)
{
return (lock_type == READ_LOCK) ? "READ" : "WRITE";
}
/****************************************************************************
Utility function called to see if a file region is locked.
If check_self is True, then checks on our own fd with the same locking context
are still made. If check_self is False, then checks are not made on our own fd
with the same locking context are not made.
****************************************************************************/
BOOL is_locked(files_struct *fsp,connection_struct *conn,
SMB_BIG_UINT count,SMB_BIG_UINT offset,
enum brl_type lock_type, BOOL check_self)
{
int snum = SNUM(conn);
BOOL ret;
if (count == 0)
return(False);
if (!lp_locking(snum) || !lp_strict_locking(snum))
return(False);
ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
global_smbpid, sys_getpid(), conn->cnum,
offset, count, lock_type, check_self);
DEBUG(10,("is_locked: brl start=%.0f len=%.0f %s for file %s\n",
(double)offset, (double)count, ret ? "locked" : "unlocked",
fsp->fsp_name ));
/*
* There is no lock held by an SMB daemon, check to
* see if there is a POSIX lock from a UNIX or NFS process.
*/
if(!ret && lp_posix_locking(snum)) {
ret = is_posix_locked(fsp, offset, count, lock_type);
DEBUG(10,("is_locked: posix start=%.0f len=%.0f %s for file %s\n",
(double)offset, (double)count, ret ? "locked" : "unlocked",
fsp->fsp_name ));
}
return ret;
}
/****************************************************************************
Utility function called by locking requests.
****************************************************************************/
BOOL do_lock(files_struct *fsp,connection_struct *conn, uint16 lock_pid,
SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type,
int *eclass,uint32 *ecode)
{
BOOL ok = False;
if (!lp_locking(SNUM(conn)))
return(True);
if (count == 0) {
*eclass = ERRDOS;
*ecode = ERRnoaccess;
return False;
}
DEBUG(10,("do_lock: lock type %s start=%.0f len=%.0f requested for file %s\n",
lock_type_name(lock_type), (double)offset, (double)count, fsp->fsp_name ));
if (OPEN_FSP(fsp) && fsp->can_lock && (fsp->conn == conn)) {
ok = brl_lock(fsp->dev, fsp->inode, fsp->fnum,
lock_pid, sys_getpid(), conn->cnum,
offset, count,
lock_type);
if (ok && lp_posix_locking(SNUM(conn))) {
/*
* Try and get a POSIX lock on this range.
* Note that this is ok if it is a read lock
* overlapping on a different fd. JRA.
*/
ok = set_posix_lock(fsp, offset, count, lock_type);
if (!ok) {
/*
* We failed to map - we must now remove the brl
* lock entry.
*/
(void)brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
lock_pid, sys_getpid(), conn->cnum,
offset, count);
}
}
}
if (!ok) {
*eclass = ERRDOS;
*ecode = ERRlock;
return False;
}
return True; /* Got lock */
}
/****************************************************************************
Utility function called by unlocking requests.
****************************************************************************/
BOOL do_unlock(files_struct *fsp,connection_struct *conn, uint16 lock_pid,
SMB_BIG_UINT count,SMB_BIG_UINT offset,
int *eclass,uint32 *ecode)
{
BOOL ok = False;
if (!lp_locking(SNUM(conn)))
return(True);
if (!OPEN_FSP(fsp) || !fsp->can_lock || (fsp->conn != conn)) {
*eclass = ERRDOS;
*ecode = ERRbadfid;
return False;
}
DEBUG(10,("do_unlock: unlock start=%.0f len=%.0f requested for file %s\n",
(double)offset, (double)count, fsp->fsp_name ));
/*
* Remove the existing lock record from the tdb lockdb
* before looking at POSIX locks. If this record doesn't
* match then don't bother looking to remove POSIX locks.
*/
ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
lock_pid, sys_getpid(), conn->cnum, offset, count);
if (!ok) {
DEBUG(10,("do_unlock: returning ERRlock.\n" ));
*eclass = ERRDOS;
*ecode = ERRnotlocked;
return False;
}
if (!lp_posix_locking(SNUM(conn)))
return True;
(void)release_posix_lock(fsp, offset, count);
return True; /* Did unlock */
}
/****************************************************************************
Remove any locks on this fd. Called from file_close().
****************************************************************************/
void locking_close_file(files_struct *fsp)
{
pid_t pid = sys_getpid();
if (!lp_locking(SNUM(fsp->conn)))
return;
/*
* Just release all the brl locks, no need to release individually.
*/
brl_close(fsp->dev, fsp->inode, pid, fsp->conn->cnum, fsp->fnum);
if(lp_posix_locking(SNUM(fsp->conn))) {
/*
* Release all the POSIX locks.
*/
posix_locking_close_file(fsp);
}
}
/****************************************************************************
Delete a record if it is for a dead process, if check_self is true, then
delete any records belonging to this pid also (there shouldn't be any).
This function is only called on locking startup and shutdown.
****************************************************************************/
static int delete_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
{
struct locking_data *data;
share_mode_entry *shares;
int i, del_count=0;
pid_t mypid = sys_getpid();
BOOL check_self = *(BOOL *)state;
int ret = 0;
tdb_chainlock(tdb, kbuf);
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
for (i=0;i<data->num_share_mode_entries;) {
if (check_self && (shares[i].pid == mypid)) {
DEBUG(0,("locking : delete_fn. LOGIC ERROR ! Shutting down and a record for my pid (%u) exists !\n",
(unsigned int)shares[i].pid ));
} else if (!process_exists(shares[i].pid)) {
DEBUG(0,("locking : delete_fn. LOGIC ERROR ! Entry for pid %u and it no longer exists !\n",
(unsigned int)shares[i].pid ));
} else {
/* Process exists, leave this record alone. */
i++;
continue;
}
data->num_share_mode_entries--;
memmove(&shares[i], &shares[i+1],
dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares)));
del_count++;
}
/* the record has shrunk a bit */
dbuf.dsize -= del_count * sizeof(*shares);
/* store it back in the database */
if (data->num_share_mode_entries == 0) {
if (tdb_delete(ttdb, kbuf) == -1)
ret = -1;
} else {
if (tdb_store(ttdb, kbuf, dbuf, TDB_REPLACE) == -1)
ret = -1;
}
tdb_chainunlock(tdb, kbuf);
return ret;
}
/****************************************************************************
Initialise the locking functions.
****************************************************************************/
static int open_read_only;
BOOL locking_init(int read_only)
{
BOOL check_self = False;
brl_init(read_only);
if (tdb)
return True;
tdb = tdb_open_log(lock_path("locking.tdb"),
0, TDB_CLEAR_IF_FIRST|USE_TDB_MMAP_FLAG,
read_only?O_RDONLY:O_RDWR|O_CREAT,
0644);
if (!tdb) {
DEBUG(0,("ERROR: Failed to initialise locking database\n"));
return False;
}
if (!posix_locking_init(read_only))
return False;
/* delete any dead locks */
if (!read_only)
tdb_traverse(tdb, delete_fn, &check_self);
open_read_only = read_only;
return True;
}
/*******************************************************************
Deinitialize the share_mode management.
******************************************************************/
BOOL locking_end(void)
{
BOOL check_self = True;
brl_shutdown(open_read_only);
if (tdb) {
/* delete any dead locks */
if (!open_read_only)
tdb_traverse(tdb, delete_fn, &check_self);
if (tdb_close(tdb) != 0)
return False;
}
return True;
}
/*******************************************************************
Form a static locking key for a dev/inode pair.
******************************************************************/
static TDB_DATA locking_key(SMB_DEV_T dev, SMB_INO_T inode)
{
static struct locking_key key;
TDB_DATA kbuf;
memset(&key, '\0', sizeof(key));
key.dev = dev;
key.inode = inode;
kbuf.dptr = (char *)&key;
kbuf.dsize = sizeof(key);
return kbuf;
}
static TDB_DATA locking_key_fsp(files_struct *fsp)
{
return locking_key(fsp->dev, fsp->inode);
}
/*******************************************************************
Lock a hash bucket entry.
******************************************************************/
BOOL lock_share_entry(connection_struct *conn,
SMB_DEV_T dev, SMB_INO_T inode)
{
return tdb_chainlock(tdb, locking_key(dev, inode)) == 0;
}
/*******************************************************************
Unlock a hash bucket entry.
******************************************************************/
void unlock_share_entry(connection_struct *conn,
SMB_DEV_T dev, SMB_INO_T inode)
{
tdb_chainunlock(tdb, locking_key(dev, inode));
}
/*******************************************************************
Lock a hash bucket entry. use a fsp for convenience
******************************************************************/
BOOL lock_share_entry_fsp(files_struct *fsp)
{
return tdb_chainlock(tdb, locking_key(fsp->dev, fsp->inode)) == 0;
}
/*******************************************************************
Unlock a hash bucket entry.
******************************************************************/
void unlock_share_entry_fsp(files_struct *fsp)
{
tdb_chainunlock(tdb, locking_key(fsp->dev, fsp->inode));
}
/*******************************************************************
Get all share mode entries for a dev/inode pair.
********************************************************************/
int get_share_modes(connection_struct *conn,
SMB_DEV_T dev, SMB_INO_T inode,
share_mode_entry **shares)
{
TDB_DATA dbuf;
struct locking_data *data;
int ret;
*shares = NULL;
dbuf = tdb_fetch(tdb, locking_key(dev, inode));
if (!dbuf.dptr)
return 0;
data = (struct locking_data *)dbuf.dptr;
ret = data->num_share_mode_entries;
if(ret)
*shares = (share_mode_entry *)memdup(dbuf.dptr + sizeof(*data), ret * sizeof(**shares));
free(dbuf.dptr);
if (! *shares)
return 0;
return ret;
}
/*******************************************************************
Fill a share mode entry.
********************************************************************/
static void fill_share_mode(char *p, files_struct *fsp, uint16 port, uint16 op_type)
{
share_mode_entry *e = (share_mode_entry *)p;
memset(e, '\0', sizeof(share_mode_entry));
e->pid = sys_getpid();
e->share_mode = fsp->share_mode;
e->op_port = port;
e->op_type = op_type;
memcpy((char *)&e->time, (char *)&fsp->open_time, sizeof(struct timeval));
}
/*******************************************************************
Check if two share mode entries are identical, ignoring oplock
and port info.
********************************************************************/
BOOL share_modes_identical( share_mode_entry *e1, share_mode_entry *e2)
{
return (e1->pid == e2->pid &&
e1->share_mode == e2->share_mode &&
e1->time.tv_sec == e2->time.tv_sec &&
e1->time.tv_usec == e2->time.tv_usec );
}
/*******************************************************************
Delete a specific share mode. Return the number
of entries left, and a memdup'ed copy of the entry deleted (if required).
Ignore if no entry deleted.
********************************************************************/
static ssize_t del_share_entry( SMB_DEV_T dev, SMB_INO_T inode,
share_mode_entry *entry, share_mode_entry **ppse)
{
TDB_DATA dbuf;
struct locking_data *data;
int i, del_count=0;
share_mode_entry *shares;
ssize_t count = 0;
if (ppse)
*ppse = NULL;
/* read in the existing share modes */
dbuf = tdb_fetch(tdb, locking_key(dev, inode));
if (!dbuf.dptr)
return -1;
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
/*
* Find any with this pid and delete it
* by overwriting with the rest of the data
* from the record.
*/
DEBUG(10,("del_share_mode: num_share_modes = %d\n", data->num_share_mode_entries ));
for (i=0;i<data->num_share_mode_entries;) {
if (share_modes_identical(&shares[i], entry)) {
if (ppse)
*ppse = memdup(&shares[i], sizeof(*shares));
data->num_share_mode_entries--;
memmove(&shares[i], &shares[i+1],
dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares)));
del_count++;
DEBUG(10,("del_share_mode: deleting entry %d\n", i ));
} else {
i++;
}
}
if (del_count) {
/* the record may have shrunk a bit */
dbuf.dsize -= del_count * sizeof(*shares);
count = (ssize_t)data->num_share_mode_entries;
/* store it back in the database */
if (data->num_share_mode_entries == 0) {
if (tdb_delete(tdb, locking_key(dev, inode)) == -1)
count = -1;
} else {
if (tdb_store(tdb, locking_key(dev, inode), dbuf, TDB_REPLACE) == -1)
count = -1;
}
}
free(dbuf.dptr);
return count;
}
/*******************************************************************
Del the share mode of a file for this process. Return the number
of entries left, and a memdup'ed copy of the entry deleted.
********************************************************************/
ssize_t del_share_mode(files_struct *fsp, share_mode_entry **ppse)
{
share_mode_entry entry;
/*
* Fake up a share_mode_entry for comparisons.
*/
fill_share_mode((char *)&entry, fsp, 0, 0);
return del_share_entry(fsp->dev, fsp->inode, &entry, ppse);
}
/*******************************************************************
Set the share mode of a file. Return False on fail, True on success.
********************************************************************/
BOOL set_share_mode(files_struct *fsp, uint16 port, uint16 op_type)
{
TDB_DATA dbuf;
struct locking_data *data;
char *p=NULL;
int size;
BOOL ret = True;
/* read in the existing share modes if any */
dbuf = tdb_fetch(tdb, locking_key_fsp(fsp));
if (!dbuf.dptr) {
/* we'll need to create a new record */
pstring fname;
pstrcpy(fname, fsp->conn->connectpath);
pstrcat(fname, "/");
pstrcat(fname, fsp->fsp_name);
size = sizeof(*data) + sizeof(share_mode_entry) + strlen(fname) + 1;
p = (char *)malloc(size);
if (!p)
return False;
data = (struct locking_data *)p;
data->num_share_mode_entries = 1;
pstrcpy(p + sizeof(*data) + sizeof(share_mode_entry), fname);
fill_share_mode(p + sizeof(*data), fsp, port, op_type);
dbuf.dptr = p;
dbuf.dsize = size;
if (tdb_store(tdb, locking_key_fsp(fsp), dbuf, TDB_REPLACE) == -1)
ret = False;
free(p);
return ret;
}
/* we're adding to an existing entry - this is a bit fiddly */
data = (struct locking_data *)dbuf.dptr;
data->num_share_mode_entries++;
size = dbuf.dsize + sizeof(share_mode_entry);
p = malloc(size);
if (!p)
return False;
memcpy(p, dbuf.dptr, sizeof(*data));
fill_share_mode(p + sizeof(*data), fsp, port, op_type);
memcpy(p + sizeof(*data) + sizeof(share_mode_entry), dbuf.dptr + sizeof(*data),
dbuf.dsize - sizeof(*data));
free(dbuf.dptr);
dbuf.dptr = p;
dbuf.dsize = size;
if (tdb_store(tdb, locking_key_fsp(fsp), dbuf, TDB_REPLACE) == -1)
ret = False;
free(p);
return ret;
}
/*******************************************************************
A generic in-place modification call for share mode entries.
********************************************************************/
static BOOL mod_share_mode( SMB_DEV_T dev, SMB_INO_T inode, share_mode_entry *entry,
void (*mod_fn)(share_mode_entry *, SMB_DEV_T, SMB_INO_T, void *),
void *param)
{
TDB_DATA dbuf;
struct locking_data *data;
int i;
share_mode_entry *shares;
BOOL need_store=False;
/* read in the existing share modes */
dbuf = tdb_fetch(tdb, locking_key(dev, inode));
if (!dbuf.dptr)
return False;
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
/* find any with our pid and call the supplied function */
for (i=0;i<data->num_share_mode_entries;i++) {
if (share_modes_identical(entry, &shares[i])) {
mod_fn(&shares[i], dev, inode, param);
need_store=True;
}
}
/* if the mod fn was called then store it back */
if (need_store) {
if (data->num_share_mode_entries == 0) {
if (tdb_delete(tdb, locking_key(dev, inode)) == -1)
need_store = False;
} else {
if (tdb_store(tdb, locking_key(dev, inode), dbuf, TDB_REPLACE) == -1)
need_store = False;
}
}
free(dbuf.dptr);
return need_store;
}
/*******************************************************************
Static function that actually does the work for the generic function
below.
********************************************************************/
static void remove_share_oplock_fn(share_mode_entry *entry, SMB_DEV_T dev, SMB_INO_T inode,
void *param)
{
DEBUG(10,("remove_share_oplock_fn: removing oplock info for entry dev=%x ino=%.0f\n",
(unsigned int)dev, (double)inode ));
/* Delete the oplock info. */
entry->op_port = 0;
entry->op_type = NO_OPLOCK;
}
/*******************************************************************
Remove an oplock port and mode entry from a share mode.
********************************************************************/
BOOL remove_share_oplock(files_struct *fsp)
{
share_mode_entry entry;
/*
* Fake up an entry for comparisons...
*/
fill_share_mode((char *)&entry, fsp, 0, 0);
return mod_share_mode(fsp->dev, fsp->inode, &entry, remove_share_oplock_fn, NULL);
}
/*******************************************************************
Static function that actually does the work for the generic function
below.
********************************************************************/
static void downgrade_share_oplock_fn(share_mode_entry *entry, SMB_DEV_T dev, SMB_INO_T inode,
void *param)
{
DEBUG(10,("downgrade_share_oplock_fn: downgrading oplock info for entry dev=%x ino=%.0f\n",
(unsigned int)dev, (double)inode ));
entry->op_type = LEVEL_II_OPLOCK;
}
/*******************************************************************
Downgrade a oplock type from exclusive to level II.
********************************************************************/
BOOL downgrade_share_oplock(files_struct *fsp)
{
share_mode_entry entry;
/*
* Fake up an entry for comparisons...
*/
fill_share_mode((char *)&entry, fsp, 0, 0);
return mod_share_mode(fsp->dev, fsp->inode, &entry, downgrade_share_oplock_fn, NULL);
}
/*******************************************************************
Delete an exclusive share oplock owned by a defunct smbd..
********************************************************************/
BOOL clear_share_entry(SMB_DEV_T dev, SMB_INO_T inode, share_mode_entry *entry)
{
return mod_share_mode(dev, inode, entry, remove_share_oplock_fn, NULL);
}
/*******************************************************************
Get/Set the delete on close flag in a set of share modes.
Return False on fail, True on success.
********************************************************************/
BOOL modify_delete_flag( SMB_DEV_T dev, SMB_INO_T inode, BOOL delete_on_close)
{
TDB_DATA dbuf;
struct locking_data *data;
int i;
share_mode_entry *shares;
/* read in the existing share modes */
dbuf = tdb_fetch(tdb, locking_key(dev, inode));
if (!dbuf.dptr)
return False;
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
/* Set/Unset the delete on close element. */
for (i=0;i<data->num_share_mode_entries;i++,shares++) {
shares->share_mode = (delete_on_close ?
(shares->share_mode | DELETE_ON_CLOSE_FLAG) :
(shares->share_mode & ~DELETE_ON_CLOSE_FLAG) );
}
/* store it back */
if (data->num_share_mode_entries) {
if (tdb_store(tdb, locking_key(dev,inode), dbuf, TDB_REPLACE)==-1) {
free(dbuf.dptr);
return False;
}
}
free(dbuf.dptr);
return True;
}
/****************************************************************************
Traverse the whole database with this function, calling traverse_callback
on each share mode
****************************************************************************/
static int traverse_fn(TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf,
void* state)
{
struct locking_data *data;
share_mode_entry *shares;
char *name;
int i;
SHAREMODE_FN(traverse_callback) = (SHAREMODE_FN_CAST())state;
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
name = dbuf.dptr + sizeof(*data) + data->num_share_mode_entries*sizeof(*shares);
for (i=0;i<data->num_share_mode_entries;i++) {
traverse_callback(&shares[i], name);
}
return 0;
}
/*******************************************************************
Call the specified function on each entry under management by the
share mode system.
********************************************************************/
int share_mode_forall(SHAREMODE_FN(fn))
{
if (!tdb)
return 0;
return tdb_traverse(tdb, traverse_fn, (void*)fn);
}
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