--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Locking functions
+ Copyright (C) Andrew Tridgell 1992-2000
+ Copyright (C) Jeremy Allison 1992-2000
+ Copyright (C) Volker Lendecke 2005
+
+ 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"
+uint16 global_smbpid;
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
+
+/* the locking database handle */
+static TDB_CONTEXT *tdb;
+
+struct locking_data {
+ union {
+ struct {
+ int num_share_mode_entries;
+ BOOL delete_on_close;
+ } s;
+ struct share_mode_entry dummy; /* Needed for alignment. */
+ } u;
+ /* the following two entries are implicit
+ struct share_mode_entry modes[num_share_mode_entries];
+ char file_name[];
+ */
+};
+
+/****************************************************************************
+ 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.
+****************************************************************************/
+
+BOOL is_locked(files_struct *fsp,connection_struct *conn,
+ SMB_BIG_UINT count,SMB_BIG_UINT offset,
+ enum brl_type lock_type)
+{
+ int snum = SNUM(conn);
+ int strict_locking = lp_strict_locking(snum);
+ BOOL ret;
+
+ if (count == 0)
+ return(False);
+
+ if (!lp_locking(snum) || !strict_locking)
+ return(False);
+
+ if (strict_locking == Auto) {
+ if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && (lock_type == READ_LOCK || lock_type == WRITE_LOCK)) {
+ DEBUG(10,("is_locked: optimisation - exclusive oplock on file %s\n", fsp->fsp_name ));
+ ret = 0;
+ } else if ((fsp->oplock_type == LEVEL_II_OPLOCK) &&
+ (lock_type == READ_LOCK)) {
+ DEBUG(10,("is_locked: optimisation - level II oplock on file %s\n", fsp->fsp_name ));
+ ret = 0;
+ } else {
+ ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
+ global_smbpid, procid_self(), conn->cnum,
+ offset, count, lock_type);
+ }
+ } else {
+ ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
+ global_smbpid, procid_self(), conn->cnum,
+ offset, count, lock_type);
+ }
+
+ 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.
+****************************************************************************/
+
+static NTSTATUS do_lock(files_struct *fsp,connection_struct *conn, uint16 lock_pid,
+ SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type, BOOL *my_lock_ctx)
+{
+ NTSTATUS status = NT_STATUS_LOCK_NOT_GRANTED;
+
+ if (!lp_locking(SNUM(conn)))
+ return NT_STATUS_OK;
+
+ /* NOTE! 0 byte long ranges ARE allowed and should be stored */
+
+ 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)) {
+ status = brl_lock(fsp->dev, fsp->inode, fsp->fnum,
+ lock_pid, procid_self(), conn->cnum,
+ offset, count,
+ lock_type, my_lock_ctx);
+
+ if (NT_STATUS_IS_OK(status) && 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.
+ */
+
+ if (!set_posix_lock(fsp, offset, count, lock_type)) {
+ if (errno == EACCES || errno == EAGAIN)
+ status = NT_STATUS_FILE_LOCK_CONFLICT;
+ else
+ status = map_nt_error_from_unix(errno);
+
+ /*
+ * We failed to map - we must now remove the brl
+ * lock entry.
+ */
+ (void)brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
+ lock_pid, procid_self(), conn->cnum,
+ offset, count, False,
+ NULL, NULL);
+ }
+ }
+ }
+
+ return status;
+}
+
+/****************************************************************************
+ Utility function called by locking requests. This is *DISGUSTING*. It also
+ appears to be "What Windows Does" (tm). Andrew, ever wonder why Windows 2000
+ is so slow on the locking tests...... ? This is the reason. Much though I hate
+ it, we need this. JRA.
+****************************************************************************/
+
+NTSTATUS do_lock_spin(files_struct *fsp,connection_struct *conn, uint16 lock_pid,
+ SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type, BOOL *my_lock_ctx)
+{
+ int j, maxj = lp_lock_spin_count();
+ int sleeptime = lp_lock_sleep_time();
+ NTSTATUS status, ret;
+
+ if (maxj <= 0)
+ maxj = 1;
+
+ ret = NT_STATUS_OK; /* to keep dumb compilers happy */
+
+ for (j = 0; j < maxj; j++) {
+ status = do_lock(fsp, conn, lock_pid, count, offset, lock_type, my_lock_ctx);
+ if (!NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED) &&
+ !NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
+ return status;
+ }
+ /* if we do fail then return the first error code we got */
+ if (j == 0) {
+ ret = status;
+ /* Don't spin if we blocked ourselves. */
+ if (*my_lock_ctx)
+ return ret;
+ }
+ if (sleeptime)
+ sys_usleep(sleeptime);
+ }
+ return ret;
+}
+
+/* Struct passed to brl_unlock. */
+struct posix_unlock_data_struct {
+ files_struct *fsp;
+ SMB_BIG_UINT offset;
+ SMB_BIG_UINT count;
+};
+
+/****************************************************************************
+ Function passed to brl_unlock to allow POSIX unlock to be done first.
+****************************************************************************/
+
+static void posix_unlock(void *pre_data)
+{
+ struct posix_unlock_data_struct *pdata = (struct posix_unlock_data_struct *)pre_data;
+
+ if (lp_posix_locking(SNUM(pdata->fsp->conn)))
+ release_posix_lock(pdata->fsp, pdata->offset, pdata->count);
+}
+
+/****************************************************************************
+ Utility function called by unlocking requests.
+****************************************************************************/
+
+NTSTATUS do_unlock(files_struct *fsp,connection_struct *conn, uint16 lock_pid,
+ SMB_BIG_UINT count,SMB_BIG_UINT offset)
+{
+ BOOL ok = False;
+ struct posix_unlock_data_struct posix_data;
+
+ if (!lp_locking(SNUM(conn)))
+ return NT_STATUS_OK;
+
+ if (!OPEN_FSP(fsp) || !fsp->can_lock || (fsp->conn != conn)) {
+ return NT_STATUS_INVALID_HANDLE;
+ }
+
+ 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.
+ */
+
+ posix_data.fsp = fsp;
+ posix_data.offset = offset;
+ posix_data.count = count;
+
+ ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
+ lock_pid, procid_self(), conn->cnum, offset, count,
+ False, posix_unlock, (void *)&posix_data);
+
+ if (!ok) {
+ DEBUG(10,("do_unlock: returning ERRlock.\n" ));
+ return NT_STATUS_RANGE_NOT_LOCKED;
+ }
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Remove any locks on this fd. Called from file_close().
+****************************************************************************/
+
+void locking_close_file(files_struct *fsp)
+{
+ struct process_id pid = procid_self();
+
+ 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);
+
+ }
+}
+
+/****************************************************************************
+ Initialise the locking functions.
+****************************************************************************/
+
+static int open_read_only;
+
+BOOL locking_init(int read_only)
+{
+ brl_init(read_only);
+
+ if (tdb)
+ return True;
+
+ tdb = tdb_open_log(lock_path("locking.tdb"),
+ SMB_OPEN_DATABASE_TDB_HASH_SIZE, TDB_DEFAULT|(read_only?0x0:TDB_CLEAR_IF_FIRST),
+ 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;
+
+ open_read_only = read_only;
+
+ return True;
+}
+
+/*******************************************************************
+ Deinitialize the share_mode management.
+******************************************************************/
+
+BOOL locking_end(void)
+{
+ BOOL ret = True;
+
+ brl_shutdown(open_read_only);
+ if (tdb) {
+ if (tdb_close(tdb) != 0)
+ ret = False;
+ }
+
+ return ret;
+}
+
+/*******************************************************************
+ Form a static locking key for a dev/inode pair.
+******************************************************************/
+
+/* key and data records in the tdb locking database */
+struct locking_key {
+ SMB_DEV_T dev;
+ SMB_INO_T ino;
+};
+
+/*******************************************************************
+ 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.ino = inode;
+ kbuf.dptr = (char *)&key;
+ kbuf.dsize = sizeof(key);
+ return kbuf;
+}
+
+/*******************************************************************
+ Print out a share mode.
+********************************************************************/
+
+char *share_mode_str(int num, struct share_mode_entry *e)
+{
+ static pstring share_str;
+
+ slprintf(share_str, sizeof(share_str)-1, "share_mode_entry[%d]: %s "
+ "pid = %s, share_access = 0x%x, private_options = 0x%x, "
+ "access_mask = 0x%x, mid = 0x%x, type= 0x%x, file_id = %lu, "
+ "dev = 0x%x, inode = %.0f",
+ num,
+ e->op_type == UNUSED_SHARE_MODE_ENTRY ? "UNUSED" : "",
+ procid_str_static(&e->pid),
+ e->share_access, e->private_options,
+ e->access_mask, e->op_mid, e->op_type, e->share_file_id,
+ (unsigned int)e->dev, (double)e->inode );
+
+ return share_str;
+}
+
+/*******************************************************************
+ Print out a share mode table.
+********************************************************************/
+
+static void print_share_mode_table(struct locking_data *data)
+{
+ int num_share_modes = data->u.s.num_share_mode_entries;
+ struct share_mode_entry *shares =
+ (struct share_mode_entry *)(data + 1);
+ int i;
+
+ for (i = 0; i < num_share_modes; i++) {
+ struct share_mode_entry entry;
+
+ memcpy(&entry, &shares[i], sizeof(struct share_mode_entry));
+ DEBUG(10,("print_share_mode_table: %s\n",
+ share_mode_str(i, &entry)));
+ }
+}
+
+/*******************************************************************
+ Get all share mode entries for a dev/inode pair.
+********************************************************************/
+
+static BOOL parse_share_modes(TDB_DATA dbuf, struct share_mode_lock *lck)
+{
+ struct locking_data *data;
+ int i;
+
+ if (dbuf.dsize < sizeof(struct locking_data)) {
+ DEBUG(0, ("parse_share_modes: buffer too short\n"));
+ return False;
+ }
+
+ data = (struct locking_data *)dbuf.dptr;
+
+ lck->delete_on_close = data->u.s.delete_on_close;
+ lck->num_share_modes = data->u.s.num_share_mode_entries;
+
+ DEBUG(10, ("parse_share_modes: delete_on_close: %d, "
+ "num_share_modes: %d\n", lck->delete_on_close,
+ lck->num_share_modes));
+
+ if ((lck->num_share_modes < 0) || (lck->num_share_modes > 1000000)) {
+ DEBUG(0, ("invalid number of share modes: %d\n",
+ lck->num_share_modes));
+ return False;
+ }
+
+ lck->share_modes = NULL;
+
+ if (lck->num_share_modes != 0) {
+
+ if (dbuf.dsize < (sizeof(struct locking_data) +
+ (lck->num_share_modes *
+ sizeof(struct share_mode_entry)))) {
+ DEBUG(0, ("parse_share_modes: buffer too short\n"));
+ return False;
+ }
+
+ lck->share_modes = talloc_memdup(lck, dbuf.dptr+sizeof(*data),
+ lck->num_share_modes *
+ sizeof(struct share_mode_entry));
+
+ if (lck->share_modes == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ return False;
+ }
+ }
+
+ /* Save off the associated service path and filename. */
+ lck->servicepath = talloc_strdup(lck, dbuf.dptr + sizeof(*data) +
+ (lck->num_share_modes *
+ sizeof(struct share_mode_entry)));
+
+ lck->filename = talloc_strdup(lck, dbuf.dptr + sizeof(*data) +
+ (lck->num_share_modes *
+ sizeof(struct share_mode_entry)) +
+ strlen(lck->servicepath) + 1 );
+
+ /*
+ * Ensure that each entry has a real process attached.
+ */
+
+ for (i = 0; i < lck->num_share_modes; i++) {
+ struct share_mode_entry *entry_p = &lck->share_modes[i];
+ DEBUG(10,("parse_share_modes: %s\n",
+ share_mode_str(i, entry_p) ));
+ if (!process_exists(entry_p->pid)) {
+ DEBUG(10,("parse_share_modes: deleted %s\n",
+ share_mode_str(i, entry_p) ));
+ entry_p->op_type = UNUSED_SHARE_MODE_ENTRY;
+ lck->modified = True;
+ }
+ }
+
+ return True;
+}
+
+static TDB_DATA unparse_share_modes(struct share_mode_lock *lck)
+{
+ TDB_DATA result;
+ int num_valid = 0;
+ int i;
+ struct locking_data *data;
+ ssize_t offset;
+ ssize_t sp_len;
+
+ result.dptr = NULL;
+ result.dsize = 0;
+
+ for (i=0; i<lck->num_share_modes; i++) {
+ if (!is_unused_share_mode_entry(&lck->share_modes[i])) {
+ num_valid += 1;
+ }
+ }
+
+ if (num_valid == 0) {
+ return result;
+ }
+
+ sp_len = strlen(lck->servicepath);
+
+ result.dsize = sizeof(*data) +
+ lck->num_share_modes * sizeof(struct share_mode_entry) +
+ sp_len + 1 +
+ strlen(lck->filename) + 1;
+ result.dptr = talloc_size(lck, result.dsize);
+
+ if (result.dptr == NULL) {
+ smb_panic("talloc failed\n");
+ }
+
+ data = (struct locking_data *)result.dptr;
+ ZERO_STRUCTP(data);
+ data->u.s.num_share_mode_entries = lck->num_share_modes;
+ data->u.s.delete_on_close = lck->delete_on_close;
+ DEBUG(10, ("unparse_share_modes: del: %d, num: %d\n",
+ data->u.s.delete_on_close,
+ data->u.s.num_share_mode_entries));
+ memcpy(result.dptr + sizeof(*data), lck->share_modes,
+ sizeof(struct share_mode_entry)*lck->num_share_modes);
+ offset = sizeof(*data) +
+ sizeof(struct share_mode_entry)*lck->num_share_modes;
+ safe_strcpy(result.dptr + offset, lck->servicepath,
+ result.dsize - offset - 1);
+ offset += sp_len + 1;
+ safe_strcpy(result.dptr + offset, lck->filename,
+ result.dsize - offset - 1);
+
+ if (DEBUGLEVEL >= 10) {
+ print_share_mode_table(data);
+ }
+
+ return result;
+}
+
+static int share_mode_lock_destructor(void *p)
+{
+ struct share_mode_lock *lck =
+ talloc_get_type_abort(p, struct share_mode_lock);
+ TDB_DATA key = locking_key(lck->dev, lck->ino);
+ TDB_DATA data;
+
+ if (!lck->modified) {
+ goto done;
+ }
+
+ data = unparse_share_modes(lck);
+
+ if (data.dptr == NULL) {
+ if (!lck->fresh) {
+ /* There has been an entry before, delete it */
+ if (tdb_delete(tdb, key) == -1) {
+ smb_panic("Could not delete share entry\n");
+ }
+ }
+ goto done;
+ }
+
+ if (tdb_store(tdb, key, data, TDB_REPLACE) == -1) {
+ smb_panic("Could not store share mode entry\n");
+ }
+
+ done:
+ tdb_chainunlock(tdb, key);
+
+ return 0;
+}
+
+struct share_mode_lock *get_share_mode_lock(TALLOC_CTX *mem_ctx,
+ SMB_DEV_T dev, SMB_INO_T ino,
+ const char *servicepath,
+ const char *fname)
+{
+ struct share_mode_lock *lck;
+ TDB_DATA key = locking_key(dev, ino);
+ TDB_DATA data;
+
+ lck = TALLOC_P(mem_ctx, struct share_mode_lock);
+ if (lck == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ return NULL;
+ }
+
+ /* Ensure we set every field here as the destructor must be
+ valid even if parse_share_modes fails. */
+
+ lck->servicepath = NULL;
+ lck->filename = NULL;
+ lck->dev = dev;
+ lck->ino = ino;
+ lck->num_share_modes = 0;
+ lck->share_modes = NULL;
+ lck->delete_on_close = False;
+ lck->fresh = False;
+ lck->modified = False;
+
+ if (tdb_chainlock(tdb, key) != 0) {
+ DEBUG(3, ("Could not lock share entry\n"));
+ talloc_free(lck);
+ return NULL;
+ }
+
+ /* We must set the destructor immediately after the chainlock
+ ensure the lock is cleaned up on any of the error return
+ paths below. */
+
+ talloc_set_destructor(lck, share_mode_lock_destructor);
+
+ data = tdb_fetch(tdb, key);
+ lck->fresh = (data.dptr == NULL);
+
+ if (lck->fresh) {
+
+ if (fname == NULL || servicepath == NULL) {
+ talloc_free(lck);
+ return NULL;
+ }
+ lck->filename = talloc_strdup(lck, fname);
+ lck->servicepath = talloc_strdup(lck, servicepath);
+ if (lck->filename == NULL || lck->servicepath == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ talloc_free(lck);
+ return NULL;
+ }
+ } else {
+ if (!parse_share_modes(data, lck)) {
+ DEBUG(0, ("Could not parse share modes\n"));
+ talloc_free(lck);
+ SAFE_FREE(data.dptr);
+ return NULL;
+ }
+ }
+
+ SAFE_FREE(data.dptr);
+
+ return lck;
+}
+
+BOOL get_delete_on_close_flag(SMB_DEV_T dev, SMB_INO_T inode,
+ const char *fname)
+{
+ BOOL result;
+ struct share_mode_lock *lck = get_share_mode_lock(NULL, dev, inode, NULL, NULL);
+ if (!lck) {
+ return False;
+ }
+ result = lck->delete_on_close;
+ talloc_free(lck);
+ return result;
+}
+
+BOOL is_valid_share_mode_entry(const struct share_mode_entry *e)
+{
+ int num_props = 0;
+
+ num_props += ((e->op_type == NO_OPLOCK) ? 1 : 0);
+ num_props += (EXCLUSIVE_OPLOCK_TYPE(e->op_type) ? 1 : 0);
+ num_props += (LEVEL_II_OPLOCK_TYPE(e->op_type) ? 1 : 0);
+
+ SMB_ASSERT(num_props <= 1);
+ return (num_props != 0);
+}
+
+BOOL is_deferred_open_entry(const struct share_mode_entry *e)
+{
+ return (e->op_type == DEFERRED_OPEN_ENTRY);
+}
+
+BOOL is_unused_share_mode_entry(const struct share_mode_entry *e)
+{
+ return (e->op_type == UNUSED_SHARE_MODE_ENTRY);
+}
+
+/*******************************************************************
+ Fill a share mode entry.
+********************************************************************/
+
+static void fill_share_mode_entry(struct share_mode_entry *e,
+ files_struct *fsp,
+ uint16 mid, uint16 op_type)
+{
+ ZERO_STRUCTP(e);
+ e->pid = procid_self();
+ e->share_access = fsp->share_access;
+ e->private_options = fsp->fh->private_options;
+ e->access_mask = fsp->access_mask;
+ e->op_mid = mid;
+ e->op_type = op_type;
+ e->time.tv_sec = fsp->open_time.tv_sec;
+ e->time.tv_usec = fsp->open_time.tv_usec;
+ e->share_file_id = fsp->file_id;
+ e->dev = fsp->dev;
+ e->inode = fsp->inode;
+}
+
+static void fill_deferred_open_entry(struct share_mode_entry *e,
+ const struct timeval request_time,
+ SMB_DEV_T dev, SMB_INO_T ino, uint16 mid)
+{
+ ZERO_STRUCTP(e);
+ e->pid = procid_self();
+ e->op_mid = mid;
+ e->op_type = DEFERRED_OPEN_ENTRY;
+ e->time.tv_sec = request_time.tv_sec;
+ e->time.tv_usec = request_time.tv_usec;
+ e->dev = dev;
+ e->inode = ino;
+}
+
+static void add_share_mode_entry(struct share_mode_lock *lck,
+ const struct share_mode_entry *entry)
+{
+ int i;
+
+ for (i=0; i<lck->num_share_modes; i++) {
+ struct share_mode_entry *e = &lck->share_modes[i];
+ if (is_unused_share_mode_entry(e)) {
+ *e = *entry;
+ break;
+ }
+ }
+
+ if (i == lck->num_share_modes) {
+ /* No unused entry found */
+ ADD_TO_ARRAY(lck, struct share_mode_entry, *entry,
+ &lck->share_modes, &lck->num_share_modes);
+ }
+ lck->modified = True;
+}
+
+void set_share_mode(struct share_mode_lock *lck, files_struct *fsp,
+ uint16 mid, uint16 op_type)
+{
+ struct share_mode_entry entry;
+ fill_share_mode_entry(&entry, fsp, mid, op_type);
+ add_share_mode_entry(lck, &entry);
+}
+
+void add_deferred_open(struct share_mode_lock *lck, uint16 mid,
+ struct timeval request_time,
+ SMB_DEV_T dev, SMB_INO_T ino)
+{
+ struct share_mode_entry entry;
+ fill_deferred_open_entry(&entry, request_time, dev, ino, mid);
+ add_share_mode_entry(lck, &entry);
+}
+
+/*******************************************************************
+ Check if two share mode entries are identical, ignoring oplock
+ and mid info and desired_access.
+********************************************************************/
+
+static BOOL share_modes_identical(struct share_mode_entry *e1,
+ struct share_mode_entry *e2)
+{
+#if 1 /* JRA PARANOIA TEST - REMOVE LATER */
+ if (procid_equal(&e1->pid, &e2->pid) &&
+ e1->share_file_id == e2->share_file_id &&
+ e1->dev == e2->dev &&
+ e1->inode == e2->inode &&
+ (e1->share_access) != (e2->share_access)) {
+ DEBUG(0,("PANIC: share_modes_identical: share_mode "
+ "mismatch (e1 = 0x%x, e2 = 0x%x). Logic error.\n",
+ (unsigned int)e1->share_access,
+ (unsigned int)e2->share_access ));
+ smb_panic("PANIC: share_modes_identical logic error.\n");
+ }
+#endif
+
+ return (procid_equal(&e1->pid, &e2->pid) &&
+ (e1->share_access) == (e2->share_access) &&
+ e1->dev == e2->dev &&
+ e1->inode == e2->inode &&
+ e1->share_file_id == e2->share_file_id );
+}
+
+static BOOL deferred_open_identical(struct share_mode_entry *e1,
+ struct share_mode_entry *e2)
+{
+ return (procid_equal(&e1->pid, &e2->pid) &&
+ (e1->op_mid == e2->op_mid) &&
+ (e1->dev == e2->dev) &&
+ (e1->inode == e2->inode));
+}
+
+static struct share_mode_entry *find_share_mode_entry(struct share_mode_lock *lck,
+ struct share_mode_entry *entry)
+{
+ int i;
+
+ for (i=0; i<lck->num_share_modes; i++) {
+ struct share_mode_entry *e = &lck->share_modes[i];
+ if (is_valid_share_mode_entry(entry) &&
+ is_valid_share_mode_entry(e) &&
+ share_modes_identical(e, entry)) {
+ return e;
+ }
+ if (is_deferred_open_entry(entry) &&
+ is_deferred_open_entry(e) &&
+ deferred_open_identical(e, entry)) {
+ return e;
+ }
+ }
+ return NULL;
+}
+
+/*******************************************************************
+ Del the share mode of a file for this process. Return the number of
+ entries left.
+********************************************************************/
+
+BOOL del_share_mode(struct share_mode_lock *lck, files_struct *fsp)
+{
+ struct share_mode_entry entry, *e;
+
+ fill_share_mode_entry(&entry, fsp, 0, 0);
+
+ e = find_share_mode_entry(lck, &entry);
+ if (e == NULL) {
+ return False;
+ }
+
+ e->op_type = UNUSED_SHARE_MODE_ENTRY;
+ lck->modified = True;
+ return True;
+}
+
+void del_deferred_open_entry(struct share_mode_lock *lck, uint16 mid)
+{
+ struct share_mode_entry entry, *e;
+
+ fill_deferred_open_entry(&entry, timeval_zero(),
+ lck->dev, lck->ino, mid);
+
+ e = find_share_mode_entry(lck, &entry);
+ if (e == NULL) {
+ return;
+ }
+
+ e->op_type = UNUSED_SHARE_MODE_ENTRY;
+ lck->modified = True;
+}
+
+/*******************************************************************
+ Remove an oplock mid and mode entry from a share mode.
+********************************************************************/
+
+BOOL remove_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
+{
+ struct share_mode_entry entry, *e;
+
+ fill_share_mode_entry(&entry, fsp, 0, 0);
+
+ e = find_share_mode_entry(lck, &entry);
+ if (e == NULL) {
+ return False;
+ }
+
+ e->op_mid = 0;
+ e->op_type = NO_OPLOCK;
+ lck->modified = True;
+ return True;
+}
+
+/*******************************************************************
+ Downgrade a oplock type from exclusive to level II.
+********************************************************************/
+
+BOOL downgrade_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
+{
+ struct share_mode_entry entry, *e;
+
+ fill_share_mode_entry(&entry, fsp, 0, 0);
+
+ e = find_share_mode_entry(lck, &entry);
+ if (e == NULL) {
+ return False;
+ }
+
+ e->op_type = LEVEL_II_OPLOCK;
+ lck->modified = True;
+ return True;
+}
+
+/****************************************************************************
+ Deal with the internal needs of setting the delete on close flag. Note that
+ as the tdb locking is recursive, it is safe to call this from within
+ open_file_shared. JRA.
+****************************************************************************/
+
+NTSTATUS can_set_delete_on_close(files_struct *fsp, BOOL delete_on_close,
+ uint32 dosmode)
+{
+ if (!delete_on_close) {
+ return NT_STATUS_OK;
+ }
+
+ /*
+ * Only allow delete on close for writable files.
+ */
+
+ if ((dosmode & aRONLY) &&
+ !lp_delete_readonly(SNUM(fsp->conn))) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on close "
+ "flag set but file attribute is readonly.\n",
+ fsp->fsp_name ));
+ return NT_STATUS_CANNOT_DELETE;
+ }
+
+ /*
+ * Only allow delete on close for writable shares.
+ */
+
+ if (!CAN_WRITE(fsp->conn)) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on "
+ "close flag set but write access denied on share.\n",
+ fsp->fsp_name ));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /*
+ * Only allow delete on close for files/directories opened with delete
+ * intent.
+ */
+
+ if (!(fsp->access_mask & DELETE_ACCESS)) {
+ DEBUG(10,("can_set_delete_on_close: file %s delete on "
+ "close flag set but delete access denied.\n",
+ fsp->fsp_name ));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Sets the delete on close flag over all share modes on this file.
+ Modify the share mode entry for all files open
+ on this device and inode to tell other smbds we have
+ changed the delete on close flag. This will be noticed
+ in the close code, the last closer will delete the file
+ if flag is set.
+****************************************************************************/
+
+BOOL set_delete_on_close(files_struct *fsp, BOOL delete_on_close)
+{
+ struct share_mode_lock *lck;
+
+ DEBUG(10,("set_delete_on_close: %s delete on close flag for "
+ "fnum = %d, file %s\n",
+ delete_on_close ? "Adding" : "Removing", fsp->fnum,
+ fsp->fsp_name ));
+
+ if (fsp->is_stat) {
+ return True;
+ }
+
+ lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL, NULL);
+ if (lck == NULL) {
+ return False;
+ }
+ if (lck->delete_on_close != delete_on_close) {
+ lck->delete_on_close = delete_on_close;
+ lck->modified = True;
+ }
+
+ talloc_free(lck);
+ return True;
+}
+
+static int traverse_fn(TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf,
+ void *state)
+{
+ struct locking_data *data;
+ struct share_mode_entry *shares;
+ const char *sharepath;
+ const char *fname;
+ int i;
+ void (*traverse_callback)(struct share_mode_entry *, const char *, const char *) = state;
+
+ /* Ensure this is a locking_key record. */
+ if (kbuf.dsize != sizeof(struct locking_key))
+ return 0;
+
+ data = (struct locking_data *)dbuf.dptr;
+ shares = (struct share_mode_entry *)(dbuf.dptr + sizeof(*data));
+ sharepath = dbuf.dptr + sizeof(*data) +
+ data->u.s.num_share_mode_entries*sizeof(*shares);
+ fname = dbuf.dptr + sizeof(*data) +
+ data->u.s.num_share_mode_entries*sizeof(*shares) +
+ strlen(sharepath) + 1;
+
+ for (i=0;i<data->u.s.num_share_mode_entries;i++) {
+ traverse_callback(&shares[i], sharepath, fname);
+ }
+ return 0;
+}
+
+/*******************************************************************
+ Call the specified function on each entry under management by the
+ share mode system.
+********************************************************************/
+
+int share_mode_forall(void (*fn)(const struct share_mode_entry *, const char *, const char *))
+{
+ if (tdb == NULL)
+ return 0;
+ return tdb_traverse(tdb, traverse_fn, fn);
+}
projects / samba / blobdiff