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authorStefan Metzmacher <metze@samba.org>2004-05-18 13:30:32 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 12:53:49 -0500
commit2fb0bdfee7c5bec2853d8490074e2e487d6a85f5 (patch)
treea21fec92a2cc68a33eb7df0f56fdb75b60b312ef /source4
parent0835e34c9e4fcc9405818bb3748da8c357e52d68 (diff)
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r769: remove unused locking/ dir
metze (This used to be commit 1f8aae548a3650215bde527782f206f17f49a803)
Diffstat (limited to 'source4')
-rw-r--r--source4/locking/brlock.c698
-rw-r--r--source4/locking/locking.c849
-rw-r--r--source4/locking/posix.c1313
3 files changed, 0 insertions, 2860 deletions
diff --git a/source4/locking/brlock.c b/source4/locking/brlock.c
deleted file mode 100644
index 94783b4fb8..0000000000
--- a/source4/locking/brlock.c
+++ /dev/null
@@ -1,698 +0,0 @@
-/*
- Unix SMB/CIFS implementation.
- byte range locking code
- Updated to handle range splits/merges.
-
- 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.
-*/
-
-/* This module implements a tdb based byte range locking service,
- replacing the fcntl() based byte range locking previously
- used. This allows us to provide the same semantics as NT */
-
-#include "includes.h"
-
-#define ZERO_ZERO 0
-
-/* This contains elements that differentiate locks. The smbpid is a
- client supplied pid, and is essentially the locking context for
- this client */
-
-struct lock_context {
- uint16 smbpid;
- uint16 tid;
- pid_t pid;
-};
-
-/* The data in brlock records is an unsorted linear array of these
- records. It is unnecessary to store the count as tdb provides the
- size of the record */
-
-struct lock_struct {
- struct lock_context context;
- br_off start;
- br_off size;
- int fnum;
- enum brl_type lock_type;
-};
-
-/* The key used in the brlock database. */
-
-struct lock_key {
- SMB_DEV_T device;
- SMB_INO_T inode;
-};
-
-/* The open brlock.tdb database. */
-
-static TDB_CONTEXT *tdb;
-
-/****************************************************************************
- Create a locking key - ensuring zero filled for pad purposes.
-****************************************************************************/
-
-static TDB_DATA locking_key(SMB_DEV_T dev, SMB_INO_T inode)
-{
- static struct lock_key key;
- TDB_DATA kbuf;
-
- memset(&key, '\0', sizeof(key));
- key.device = dev;
- key.inode = inode;
- kbuf.dptr = (char *)&key;
- kbuf.dsize = sizeof(key);
- return kbuf;
-}
-
-/****************************************************************************
- See if two locking contexts are equal.
-****************************************************************************/
-
-static BOOL brl_same_context(struct lock_context *ctx1,
- struct lock_context *ctx2)
-{
- return (ctx1->pid == ctx2->pid) &&
- (ctx1->smbpid == ctx2->smbpid) &&
- (ctx1->tid == ctx2->tid);
-}
-
-/****************************************************************************
- See if lock2 can be added when lock1 is in place.
-****************************************************************************/
-
-static BOOL brl_conflict(struct lock_struct *lck1,
- struct lock_struct *lck2)
-{
- if (lck1->lock_type == PENDING_LOCK || lck2->lock_type == PENDING_LOCK )
- return False;
-
- if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK) {
- return False;
- }
-
- if (brl_same_context(&lck1->context, &lck2->context) &&
- lck2->lock_type == READ_LOCK && lck1->fnum == lck2->fnum) {
- return False;
- }
-
- if (lck1->start >= (lck2->start + lck2->size) ||
- lck2->start >= (lck1->start + lck1->size)) {
- return False;
- }
-
- return True;
-}
-
-#if ZERO_ZERO
-static BOOL brl_conflict1(struct lock_struct *lck1,
- struct lock_struct *lck2)
-{
- if (lck1->lock_type == PENDING_LOCK || lck2->lock_type == PENDING_LOCK )
- return False;
-
- if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK) {
- return False;
- }
-
- if (brl_same_context(&lck1->context, &lck2->context) &&
- lck2->lock_type == READ_LOCK && lck1->fnum == lck2->fnum) {
- return False;
- }
-
- if (lck2->start == 0 && lck2->size == 0 && lck1->size != 0) {
- return True;
- }
-
- if (lck1->start >= (lck2->start + lck2->size) ||
- lck2->start >= (lck1->start + lck1->size)) {
- return False;
- }
-
- return True;
-}
-#endif
-
-/****************************************************************************
- Check to see if this lock conflicts, but ignore our own locks on the
- same fnum only.
-****************************************************************************/
-
-static BOOL brl_conflict_other(struct lock_struct *lck1, struct lock_struct *lck2)
-{
- if (lck1->lock_type == PENDING_LOCK || lck2->lock_type == PENDING_LOCK )
- return False;
-
- if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK)
- return False;
-
- /*
- * Incoming WRITE locks conflict with existing READ locks even
- * if the context is the same. JRA. See LOCKTEST7 in smbtorture.
- */
-
- if (!(lck2->lock_type == WRITE_LOCK && lck1->lock_type == READ_LOCK)) {
- if (brl_same_context(&lck1->context, &lck2->context) &&
- lck1->fnum == lck2->fnum)
- return False;
- }
-
- if (lck1->start >= (lck2->start + lck2->size) ||
- lck2->start >= (lck1->start + lck1->size)) return False;
-
- return True;
-}
-
-
-#if DONT_DO_THIS
- /* doing this traversal could kill solaris machines under high load (tridge) */
- /* delete any dead locks */
-
-/****************************************************************************
- 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).
-****************************************************************************/
-
-static int delete_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
-{
- struct lock_struct *locks;
- int count, i;
- BOOL check_self = *(BOOL *)state;
- pid_t mypid = sys_getpid();
-
- tdb_chainlock(tdb, kbuf);
-
- locks = (struct lock_struct *)dbuf.dptr;
-
- count = dbuf.dsize / sizeof(*locks);
- for (i=0; i<count; i++) {
- struct lock_struct *lock = &locks[i];
-
- /* If check_self is true we want to remove our own records. */
- if (check_self && (mypid == lock->context.pid)) {
-
- DEBUG(0,("brlock : delete_fn. LOGIC ERROR ! Shutting down and a record for my pid (%u) exists !\n",
- (unsigned int)lock->context.pid ));
-
- } else if (process_exists(lock->context.pid)) {
-
- DEBUG(10,("brlock : delete_fn. pid %u exists.\n", (unsigned int)lock->context.pid ));
- continue;
- }
-
- DEBUG(10,("brlock : delete_fn. Deleting record for process %u\n",
- (unsigned int)lock->context.pid ));
-
- if (count > 1 && i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
- }
- count--;
- i--;
- }
-
- if (count == 0) {
- tdb_delete(tdb, kbuf);
- } else if (count < (dbuf.dsize / sizeof(*locks))) {
- dbuf.dsize = count * sizeof(*locks);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
- }
-
- tdb_chainunlock(tdb, kbuf);
- return 0;
-}
-#endif
-
-/****************************************************************************
- Open up the brlock.tdb database.
-****************************************************************************/
-
-void brl_init(int read_only)
-{
- if (tdb)
- return;
- tdb = tdb_open_log(lock_path("brlock.tdb"), 0, TDB_DEFAULT|(read_only?0x0:TDB_CLEAR_IF_FIRST),
- read_only?O_RDONLY:(O_RDWR|O_CREAT), 0644);
- if (!tdb) {
- DEBUG(0,("Failed to open byte range locking database\n"));
- return;
- }
-
-#if DONT_DO_THIS
- /* doing this traversal could kill solaris machines under high load (tridge) */
- /* delete any dead locks */
- if (!read_only) {
- BOOL check_self = False;
- tdb_traverse(tdb, delete_fn, &check_self);
- }
-#endif
-}
-
-/****************************************************************************
- Close down the brlock.tdb database.
-****************************************************************************/
-
-void brl_shutdown(int read_only)
-{
- if (!tdb)
- return;
-
-#if DONT_DO_THIS
- /* doing this traversal could kill solaris machines under high load (tridge) */
- /* delete any dead locks */
- if (!read_only) {
- BOOL check_self = True;
- tdb_traverse(tdb, delete_fn, &check_self);
- }
-#endif
-
- tdb_close(tdb);
-}
-
-#if ZERO_ZERO
-/****************************************************************************
-compare two locks for sorting
-****************************************************************************/
-static int lock_compare(struct lock_struct *lck1,
- struct lock_struct *lck2)
-{
- if (lck1->start != lck2->start) return (lck1->start - lck2->start);
- if (lck2->size != lck1->size) {
- return ((int)lck1->size - (int)lck2->size);
- }
- return 0;
-}
-#endif
-
-/****************************************************************************
- Lock a range of bytes.
-****************************************************************************/
-
-NTSTATUS brl_lock(SMB_DEV_T dev, SMB_INO_T ino, int fnum,
- uint16 smbpid, pid_t pid, uint16 tid,
- br_off start, br_off size,
- enum brl_type lock_type)
-{
- TDB_DATA kbuf, dbuf;
- int count, i;
- struct lock_struct lock, *locks;
- char *tp;
- NTSTATUS status = NT_STATUS_OK;
- static int last_failed = -1;
- static br_off last_failed_start;
-
- kbuf = locking_key(dev,ino);
-
- dbuf.dptr = NULL;
-
-#if !ZERO_ZERO
- if (start == 0 && size == 0) {
- DEBUG(0,("client sent 0/0 lock - please report this\n"));
- }
-#endif
-
- tdb_chainlock(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
-
- lock.context.smbpid = smbpid;
- lock.context.pid = pid;
- lock.context.tid = tid;
- lock.start = start;
- lock.size = size;
- lock.fnum = fnum;
- lock.lock_type = lock_type;
-
- if (dbuf.dptr) {
- /* there are existing locks - make sure they don't conflict */
- locks = (struct lock_struct *)dbuf.dptr;
- count = dbuf.dsize / sizeof(*locks);
- for (i=0; i<count; i++) {
- if (brl_conflict(&locks[i], &lock)) {
- status = NT_STATUS_LOCK_NOT_GRANTED;
- goto fail;
- }
-#if ZERO_ZERO
- if (lock.start == 0 && lock.size == 0 &&
- locks[i].size == 0) {
- break;
- }
-#endif
- }
- }
-
- /* no conflicts - add it to the list of locks */
- tp = Realloc(dbuf.dptr, dbuf.dsize + sizeof(*locks));
- if (!tp) {
- status = NT_STATUS_NO_MEMORY;
- goto fail;
- } else {
- dbuf.dptr = tp;
- }
- memcpy(dbuf.dptr + dbuf.dsize, &lock, sizeof(lock));
- dbuf.dsize += sizeof(lock);
-
-#if ZERO_ZERO
- /* sort the lock list */
- qsort(dbuf.dptr, dbuf.dsize/sizeof(lock), sizeof(lock), QSORT_CAST lock_compare);
-#endif
-
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
-
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return NT_STATUS_OK;
-
- fail:
- /* this is a nasty hack to try to simulate the lock result cache code in w2k.
- It isn't completely accurate as I haven't yet worked out the correct
- semantics (tridge)
- */
- if (last_failed == fnum &&
- last_failed_start == start &&
- NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
- status = NT_STATUS_FILE_LOCK_CONFLICT;
- }
- last_failed = fnum;
- last_failed_start = start;
-
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return status;
-}
-
-/****************************************************************************
- Check if an unlock overlaps a pending lock.
-****************************************************************************/
-
-static BOOL brl_pending_overlap(struct lock_struct *lock, struct lock_struct *pend_lock)
-{
- if ((lock->start <= pend_lock->start) && (lock->start + lock->size > pend_lock->start))
- return True;
- if ((lock->start >= pend_lock->start) && (lock->start <= pend_lock->start + pend_lock->size))
- return True;
- return False;
-}
-
-/****************************************************************************
- Unlock a range of bytes.
-****************************************************************************/
-
-BOOL brl_unlock(SMB_DEV_T dev, SMB_INO_T ino, int fnum,
- uint16 smbpid, pid_t pid, uint16 tid,
- br_off start, br_off size,
- BOOL remove_pending_locks_only)
-{
- TDB_DATA kbuf, dbuf;
- int count, i, j;
- struct lock_struct *locks;
- struct lock_context context;
-
- kbuf = locking_key(dev,ino);
-
- dbuf.dptr = NULL;
-
- tdb_chainlock(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
-
- if (!dbuf.dptr) {
- DEBUG(10,("brl_unlock: tdb_fetch failed !\n"));
- goto fail;
- }
-
- context.smbpid = smbpid;
- context.pid = pid;
- context.tid = tid;
-
- /* there are existing locks - find a match */
- locks = (struct lock_struct *)dbuf.dptr;
- count = dbuf.dsize / sizeof(*locks);
-
-#if ZERO_ZERO
- for (i=0; i<count; i++) {
- struct lock_struct *lock = &locks[i];
-
- if (lock->lock_type == WRITE_LOCK &&
- brl_same_context(&lock->context, &context) &&
- lock->fnum == fnum &&
- lock->start == start &&
- lock->size == size) {
- /* found it - delete it */
- if (count == 1) {
- tdb_delete(tdb, kbuf);
- } else {
- if (i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
- }
- dbuf.dsize -= sizeof(*locks);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
- }
-
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return True;
- }
- }
-#endif
-
- locks = (struct lock_struct *)dbuf.dptr;
- count = dbuf.dsize / sizeof(*locks);
- for (i=0; i<count; i++) {
- struct lock_struct *lock = &locks[i];
-
- if (brl_same_context(&lock->context, &context) &&
- lock->fnum == fnum &&
- lock->start == start &&
- lock->size == size) {
-
- if (remove_pending_locks_only && lock->lock_type != PENDING_LOCK)
- continue;
-
- if (lock->lock_type != PENDING_LOCK) {
- /* Send unlock messages to any pending waiters that overlap. */
- for (j=0; j<count; j++) {
- struct lock_struct *pend_lock = &locks[j];
-
- /* Ignore non-pending locks. */
- if (pend_lock->lock_type != PENDING_LOCK)
- continue;
-
- /* We could send specific lock info here... */
- if (brl_pending_overlap(lock, pend_lock)) {
- DEBUG(10,("brl_unlock: sending unlock message to pid %u\n",
- (unsigned int)pend_lock->context.pid ));
-
- message_send_pid(pend_lock->context.pid,
- MSG_SMB_UNLOCK,
- NULL, 0, True);
- }
- }
- }
-
- /* found it - delete it */
- if (count == 1) {
- tdb_delete(tdb, kbuf);
- } else {
- if (i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
- }
- dbuf.dsize -= sizeof(*locks);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
- }
-
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return True;
- }
- }
-
- /* we didn't find it */
-
- fail:
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return False;
-}
-
-
-/****************************************************************************
- Test if we could add a lock if we wanted to.
-****************************************************************************/
-
-BOOL brl_locktest(SMB_DEV_T dev, SMB_INO_T ino, int fnum,
- uint16 smbpid, pid_t pid, uint16 tid,
- br_off start, br_off size,
- enum brl_type lock_type, int check_self)
-{
- TDB_DATA kbuf, dbuf;
- int count, i;
- struct lock_struct lock, *locks;
-
- kbuf = locking_key(dev,ino);
-
- dbuf.dptr = NULL;
-
- tdb_chainlock(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
-
- lock.context.smbpid = smbpid;
- lock.context.pid = pid;
- lock.context.tid = tid;
- lock.start = start;
- lock.size = size;
- lock.fnum = fnum;
- lock.lock_type = lock_type;
-
- if (dbuf.dptr) {
- /* there are existing locks - make sure they don't conflict */
- locks = (struct lock_struct *)dbuf.dptr;
- count = dbuf.dsize / sizeof(*locks);
- for (i=0; i<count; i++) {
- if (check_self) {
- if (brl_conflict(&locks[i], &lock))
- goto fail;
- } else {
- /*
- * Our own locks don't conflict.
- */
- if (brl_conflict_other(&locks[i], &lock))
- goto fail;
- }
- }
- }
-
- /* no conflicts - we could have added it */
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return True;
-
- fail:
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
- return False;
-}
-
-/****************************************************************************
- Remove any locks associated with a open file.
-****************************************************************************/
-
-void brl_close(SMB_DEV_T dev, SMB_INO_T ino, pid_t pid, int tid, int fnum)
-{
- TDB_DATA kbuf, dbuf;
- int count, i, j, dcount=0;
- struct lock_struct *locks;
-
- kbuf = locking_key(dev,ino);
-
- dbuf.dptr = NULL;
-
- tdb_chainlock(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
-
- if (!dbuf.dptr) goto fail;
-
- /* there are existing locks - remove any for this fnum */
- locks = (struct lock_struct *)dbuf.dptr;
- count = dbuf.dsize / sizeof(*locks);
-
- for (i=0; i<count; i++) {
- struct lock_struct *lock = &locks[i];
-
- if (lock->context.tid == tid &&
- lock->context.pid == pid &&
- lock->fnum == fnum) {
-
- /* Send unlock messages to any pending waiters that overlap. */
- for (j=0; j<count; j++) {
- struct lock_struct *pend_lock = &locks[j];
-
- /* Ignore our own or non-pending locks. */
- if (pend_lock->lock_type != PENDING_LOCK)
- continue;
-
- if (pend_lock->context.tid == tid &&
- pend_lock->context.pid == pid &&
- pend_lock->fnum == fnum)
- continue;
-
- /* We could send specific lock info here... */
- if (brl_pending_overlap(lock, pend_lock))
- message_send_pid(pend_lock->context.pid,
- MSG_SMB_UNLOCK,
- NULL, 0, True);
- }
-
- /* found it - delete it */
- if (count > 1 && i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
- }
- count--;
- i--;
- dcount++;
- }
- }
-
- if (count == 0) {
- tdb_delete(tdb, kbuf);
- } else if (count < (dbuf.dsize / sizeof(*locks))) {
- dbuf.dsize -= dcount * sizeof(*locks);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
- }
-
- /* we didn't find it */
- fail:
- SAFE_FREE(dbuf.dptr);
- tdb_chainunlock(tdb, kbuf);
-}
-
-/****************************************************************************
- Traverse the whole database with this function, calling traverse_callback
- on each lock.
-****************************************************************************/
-
-static int traverse_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
-{
- struct lock_struct *locks;
- struct lock_key *key;
- int i;
-
- BRLOCK_FN(traverse_callback) = (BRLOCK_FN_CAST())state;
-
- locks = (struct lock_struct *)dbuf.dptr;
- key = (struct lock_key *)kbuf.dptr;
-
- for (i=0;i<dbuf.dsize/sizeof(*locks);i++) {
- traverse_callback(key->device, key->inode,
- locks[i].context.pid,
- locks[i].lock_type,
- locks[i].start,
- locks[i].size);
- }
- return 0;
-}
-
-/*******************************************************************
- Call the specified function on each lock in the database.
-********************************************************************/
-
-int brl_forall(BRLOCK_FN(fn))
-{
- if (!tdb) return 0;
- return tdb_traverse(tdb, traverse_fn, (void *)fn);
-}
diff --git a/source4/locking/locking.c b/source4/locking/locking.c
deleted file mode 100644
index 63e1f3a164..0000000000
--- a/source4/locking/locking.c
+++ /dev/null
@@ -1,849 +0,0 @@
-/*
- Unix SMB/CIFS implementation.
- 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"
-
-/* 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,struct tcon_context *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.
-****************************************************************************/
-
-static NTSTATUS do_lock(files_struct *fsp,struct tcon_context *conn, uint16 lock_pid,
- SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type)
-{
- 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, sys_getpid(), conn->cnum,
- offset, count,
- lock_type);
-
- 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)) {
- status = NT_STATUS_LOCK_NOT_GRANTED;
- /*
- * 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, False);
- }
- }
- }
-
- 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,struct tcon_context *conn, uint16 lock_pid,
- SMB_BIG_UINT count,SMB_BIG_UINT offset,enum brl_type lock_type)
-{
- 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);
- 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;
- }
- if (sleeptime)
- sys_usleep(sleeptime);
- }
- return ret;
-}
-
-/****************************************************************************
- Utility function called by unlocking requests.
-****************************************************************************/
-
-NTSTATUS do_unlock(files_struct *fsp,struct tcon_context *conn, uint16 lock_pid,
- SMB_BIG_UINT count,SMB_BIG_UINT offset)
-{
- BOOL ok = False;
-
- 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.
- */
-
- ok = brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
- lock_pid, sys_getpid(), conn->cnum, offset, count, False);
-
- if (!ok) {
- DEBUG(10,("do_unlock: returning ERRlock.\n" ));
- return NT_STATUS_RANGE_NOT_LOCKED;
- }
-
- if (!lp_posix_locking(SNUM(conn)))
- return NT_STATUS_OK;
-
- (void)release_posix_lock(fsp, offset, count);
-
- return NT_STATUS_OK;
-}
-
-/****************************************************************************
- 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);
-
- }
-}
-
-/****************************************************************************
- 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"),
- 0, 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)
-{
-
- brl_shutdown(open_read_only);
- if (tdb) {
-
- 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(struct tcon_context *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(struct tcon_context *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));
-}
-
-/*******************************************************************
- Print out a share mode.
-********************************************************************/
-
-static char *share_mode_str(int num, share_mode_entry *e)
-{
- static pstring share_str;
-
- slprintf(share_str, sizeof(share_str)-1, "share_mode_entry[%d]: \
-pid = %u, share_mode = 0x%x, desired_access = 0x%x, port = 0x%x, type= 0x%x, file_id = %lu, dev = 0x%x, inode = %.0f",
- num, e->pid, e->share_mode, (unsigned int)e->desired_access, e->op_port, 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.num_share_mode_entries;
- share_mode_entry *shares = (share_mode_entry *)(data + 1);
- int i;
-
- for (i = 0; i < num_share_modes; i++) {
- share_mode_entry *entry_p = &shares[i];
- DEBUG(10,("print_share_mode_table: %s\n", share_mode_str(i, entry_p) ));
- }
-}
-
-/*******************************************************************
- Get all share mode entries for a dev/inode pair.
-********************************************************************/
-
-int get_share_modes(struct tcon_context *conn,
- SMB_DEV_T dev, SMB_INO_T inode,
- share_mode_entry **pp_shares)
-{
- TDB_DATA dbuf;
- struct locking_data *data;
- int num_share_modes;
- share_mode_entry *shares = NULL;
-
- *pp_shares = NULL;
-
- dbuf = tdb_fetch(tdb, locking_key(dev, inode));
- if (!dbuf.dptr)
- return 0;
-
- data = (struct locking_data *)dbuf.dptr;
- num_share_modes = data->u.num_share_mode_entries;
- if(num_share_modes) {
- int i;
- int del_count = 0;
-
- shares = (share_mode_entry *)memdup(dbuf.dptr + sizeof(*data),
- num_share_modes * sizeof(share_mode_entry));
-
- if (!shares) {
- SAFE_FREE(dbuf.dptr);
- return 0;
- }
-
- /*
- * Ensure that each entry has a real process attached.
- */
-
- for (i = 0; i < num_share_modes; ) {
- share_mode_entry *entry_p = &shares[i];
- if (process_exists(entry_p->pid)) {
- DEBUG(10,("get_share_modes: %s\n", share_mode_str(i, entry_p) ));
- i++;
- } else {
- DEBUG(10,("get_share_modes: deleted %s\n", share_mode_str(i, entry_p) ));
- memcpy( &shares[i], &shares[i+1],
- sizeof(share_mode_entry) * (num_share_modes - i - 1));
- num_share_modes--;
- del_count++;
- }
- }
-
- /* Did we delete any ? If so, re-store in tdb. */
- if (del_count) {
- data->u.num_share_mode_entries = num_share_modes;
-
- if (num_share_modes)
- memcpy(dbuf.dptr + sizeof(*data), shares,
- num_share_modes * sizeof(share_mode_entry));
-
- /* The record has shrunk a bit */
- dbuf.dsize -= del_count * sizeof(share_mode_entry);
-
- if (tdb_store(tdb, locking_key(dev, inode), dbuf, TDB_REPLACE) == -1) {
- SAFE_FREE(shares);
- SAFE_FREE(dbuf.dptr);
- return 0;
- }
- }
- }
-
- SAFE_FREE(dbuf.dptr);
- *pp_shares = shares;
- return num_share_modes;
-}
-
-/*******************************************************************
- 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;
- void *x = &e->time; /* Needed to force alignment. p may not be aligned.... */
-
- memset(e, '\0', sizeof(share_mode_entry));
- e->pid = sys_getpid();
- e->share_mode = fsp->share_mode;
- e->desired_access = fsp->desired_access;
- e->op_port = port;
- e->op_type = op_type;
- memcpy(x, &fsp->open_time, sizeof(struct timeval));
- e->share_file_id = fsp->file_id;
- e->dev = fsp->dev;
- e->inode = fsp->inode;
-}
-
-/*******************************************************************
- Check if two share mode entries are identical, ignoring oplock
- and port info and desired_access.
-********************************************************************/
-
-BOOL share_modes_identical( share_mode_entry *e1, share_mode_entry *e2)
-{
-#if 1 /* JRA PARANOIA TEST - REMOVE LATER */
- if (e1->pid == e2->pid &&
- e1->share_file_id == e2->share_file_id &&
- e1->dev == e2->dev &&
- e1->inode == e2->inode &&
- (e1->share_mode & ~DELETE_ON_CLOSE_FLAG) != (e2->share_mode & ~DELETE_ON_CLOSE_FLAG)) {
- DEBUG(0,("PANIC: share_modes_identical: share_mode missmatch (e1 = %u, e2 = %u). Logic error.\n",
- (unsigned int)(e1->share_mode & ~DELETE_ON_CLOSE_FLAG),
- (unsigned int)(e2->share_mode & ~DELETE_ON_CLOSE_FLAG) ));
- smb_panic("PANIC: share_modes_identical logic error.\n");
- }
-#endif
-
- return (e1->pid == e2->pid &&
- (e1->share_mode & ~DELETE_ON_CLOSE_FLAG) == (e2->share_mode & ~DELETE_ON_CLOSE_FLAG) &&
- e1->dev == e2->dev &&
- e1->inode == e2->inode &&
- e1->share_file_id == e2->share_file_id );
-}
-
-/*******************************************************************
- 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.
-********************************************************************/
-
-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_entry: num_share_modes = %d\n", data->u.num_share_mode_entries ));
-
- for (i=0;i<data->u.num_share_mode_entries;) {
- if (share_modes_identical(&shares[i], entry)) {
- DEBUG(10,("del_share_entry: deleted %s\n",
- share_mode_str(i, &shares[i]) ));
- if (ppse)
- *ppse = memdup(&shares[i], sizeof(*shares));
- data->u.num_share_mode_entries--;
- memmove(&shares[i], &shares[i+1],
- dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares)));
- del_count++;
-
- DEBUG(10,("del_share_entry: 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->u.num_share_mode_entries;
-
- /* store it back in the database */
- if (data->u.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;
- }
- }
- DEBUG(10,("del_share_entry: Remaining table.\n"));
- print_share_mode_table((struct locking_data *)dbuf.dptr);
- SAFE_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) {
- size_t offset;
- /* 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->u.num_share_mode_entries = 1;
-
- DEBUG(10,("set_share_mode: creating entry for file %s. num_share_modes = 1\n",
- fsp->fsp_name ));
-
- offset = sizeof(*data) + sizeof(share_mode_entry);
- safe_strcpy(p + offset, fname, size - offset - 1);
- 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;
-
- print_share_mode_table((struct locking_data *)p);
-
- SAFE_FREE(p);
- return ret;
- }
-
- /* we're adding to an existing entry - this is a bit fiddly */
- data = (struct locking_data *)dbuf.dptr;
-
- data->u.num_share_mode_entries++;
-
- DEBUG(10,("set_share_mode: adding entry for file %s. new num_share_modes = %d\n",
- fsp->fsp_name, data->u.num_share_mode_entries ));
-
- size = dbuf.dsize + sizeof(share_mode_entry);
- p = malloc(size);
- if (!p) {
- SAFE_FREE(dbuf.dptr);
- 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));
- SAFE_FREE(dbuf.dptr);
- dbuf.dptr = p;
- dbuf.dsize = size;
- if (tdb_store(tdb, locking_key_fsp(fsp), dbuf, TDB_REPLACE) == -1)
- ret = False;
- print_share_mode_table((struct locking_data *)p);
- SAFE_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;
- BOOL ret = True;
-
- /* 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->u.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->u.num_share_mode_entries == 0) {
- if (tdb_delete(tdb, locking_key(dev, inode)) == -1)
- ret = False;
- } else {
- if (tdb_store(tdb, locking_key(dev, inode), dbuf, TDB_REPLACE) == -1)
- ret = False;
- }
- }
-
- SAFE_FREE(dbuf.dptr);
- return ret;
-}
-
-/*******************************************************************
- 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);
-}
-
-/*******************************************************************
- 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->u.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->u.num_share_mode_entries) {
- if (tdb_store(tdb, locking_key(dev,inode), dbuf, TDB_REPLACE)==-1) {
- SAFE_FREE(dbuf.dptr);
- return False;
- }
- }
-
- SAFE_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->u.num_share_mode_entries*sizeof(*shares);
-
- for (i=0;i<data->u.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);
-}
diff --git a/source4/locking/posix.c b/source4/locking/posix.c
deleted file mode 100644
index 81690bace9..0000000000
--- a/source4/locking/posix.c
+++ /dev/null
@@ -1,1313 +0,0 @@
-/*
- Unix SMB/CIFS implementation.
- Locking functions
- 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:
-
- POSIX locking support. Jeremy Allison (jeremy@valinux.com), Apr. 2000.
-*/
-
-#include "includes.h"
-
-/*
- * The POSIX locking database handle.
- */
-
-static TDB_CONTEXT *posix_lock_tdb;
-
-/*
- * The pending close database handle.
- */
-
-static TDB_CONTEXT *posix_pending_close_tdb;
-
-/*
- * The data in POSIX lock records is an unsorted linear array of these
- * records. It is unnecessary to store the count as tdb provides the
- * size of the record.
- */
-
-struct posix_lock {
- int fd;
- SMB_OFF_T start;
- SMB_OFF_T size;
- int lock_type;
-};
-
-/*
- * The data in POSIX pending close records is an unsorted linear array of int
- * records. It is unnecessary to store the count as tdb provides the
- * size of the record.
- */
-
-/* The key used in both the POSIX databases. */
-
-struct posix_lock_key {
- SMB_DEV_T device;
- SMB_INO_T inode;
-};
-
-/*******************************************************************
- 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 posix_lock_key key;
- TDB_DATA kbuf;
-
- memset(&key, '\0', sizeof(key));
- key.device = dev;
- key.inode = inode;
- kbuf.dptr = (char *)&key;
- kbuf.dsize = sizeof(key);
- return kbuf;
-}
-
-/*******************************************************************
- Convenience function to get a key from an fsp.
-******************************************************************/
-
-static TDB_DATA locking_key_fsp(files_struct *fsp)
-{
- return locking_key(fsp->dev, fsp->inode);
-}
-
-/****************************************************************************
- Add an fd to the pending close tdb.
-****************************************************************************/
-
-static BOOL add_fd_to_close_entry(files_struct *fsp)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- char *tp;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_pending_close_tdb, kbuf);
-
- tp = Realloc(dbuf.dptr, dbuf.dsize + sizeof(int));
- if (!tp) {
- DEBUG(0,("add_fd_to_close_entry: Realloc fail !\n"));
- SAFE_FREE(dbuf.dptr);
- return False;
- } else
- dbuf.dptr = tp;
-
- memcpy(dbuf.dptr + dbuf.dsize, &fsp->fd, sizeof(int));
- dbuf.dsize += sizeof(int);
-
- if (tdb_store(posix_pending_close_tdb, kbuf, dbuf, TDB_REPLACE) == -1) {
- DEBUG(0,("add_fd_to_close_entry: tdb_store fail !\n"));
- }
-
- SAFE_FREE(dbuf.dptr);
- return True;
-}
-
-/****************************************************************************
- Remove all fd entries for a specific dev/inode pair from the tdb.
-****************************************************************************/
-
-static void delete_close_entries(files_struct *fsp)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
-
- if (tdb_delete(posix_pending_close_tdb, kbuf) == -1)
- DEBUG(0,("delete_close_entries: tdb_delete fail !\n"));
-}
-
-/****************************************************************************
- Get the array of POSIX pending close records for an open fsp. Caller must
- free. Returns number of entries.
-****************************************************************************/
-
-static size_t get_posix_pending_close_entries(files_struct *fsp, int **entries)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- size_t count = 0;
-
- *entries = NULL;
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_pending_close_tdb, kbuf);
-
- if (!dbuf.dptr) {
- return 0;
- }
-
- *entries = (int *)dbuf.dptr;
- count = (size_t)(dbuf.dsize / sizeof(int));
-
- return count;
-}
-
-/****************************************************************************
- Get the array of POSIX locks for an fsp. Caller must free. Returns
- number of entries.
-****************************************************************************/
-
-static size_t get_posix_lock_entries(files_struct *fsp, struct posix_lock **entries)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- size_t count = 0;
-
- *entries = NULL;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_lock_tdb, kbuf);
-
- if (!dbuf.dptr) {
- return 0;
- }
-
- *entries = (struct posix_lock *)dbuf.dptr;
- count = (size_t)(dbuf.dsize / sizeof(struct posix_lock));
-
- return count;
-}
-
-/****************************************************************************
- Deal with pending closes needed by POSIX locking support.
- Note that posix_locking_close_file() is expected to have been called
- to delete all locks on this fsp before this function is called.
-****************************************************************************/
-
-int fd_close_posix(struct tcon_context *conn, files_struct *fsp)
-{
- int saved_errno = 0;
- int ret;
- size_t count, i;
- struct posix_lock *entries = NULL;
- int *fd_array = NULL;
- BOOL locks_on_other_fds = False;
-
- if (!lp_posix_locking(SNUM(conn))) {
- /*
- * No POSIX to worry about, just close.
- */
- ret = conn->vfs_ops.close(fsp,fsp->fd);
- fsp->fd = -1;
- return ret;
- }
-
- /*
- * Get the number of outstanding POSIX locks on this dev/inode pair.
- */
-
- count = get_posix_lock_entries(fsp, &entries);
-
- /*
- * Check if there are any outstanding locks belonging to
- * other fd's. This should never be the case if posix_locking_close_file()
- * has been called first, but it never hurts to be *sure*.
- */
-
- for (i = 0; i < count; i++) {
- if (entries[i].fd != fsp->fd) {
- locks_on_other_fds = True;
- break;
- }
- }
-
- if (locks_on_other_fds) {
-
- /*
- * There are outstanding locks on this dev/inode pair on other fds.
- * Add our fd to the pending close tdb and set fsp->fd to -1.
- */
-
- if (!add_fd_to_close_entry(fsp)) {
- SAFE_FREE(entries);
- return False;
- }
-
- SAFE_FREE(entries);
- fsp->fd = -1;
- return 0;
- }
-
- SAFE_FREE(entries);
-
- /*
- * No outstanding POSIX locks. Get the pending close fd's
- * from the tdb and close them all.
- */
-
- count = get_posix_pending_close_entries(fsp, &fd_array);
-
- if (count) {
- DEBUG(10,("fd_close_posix: doing close on %u fd's.\n", (unsigned int)count ));
-
- for(i = 0; i < count; i++) {
- if (conn->vfs_ops.close(fsp,fd_array[i]) == -1) {
- saved_errno = errno;
- }
- }
-
- /*
- * Delete all fd's stored in the tdb
- * for this dev/inode pair.
- */
-
- delete_close_entries(fsp);
- }
-
- SAFE_FREE(fd_array);
-
- /*
- * Finally close the fd associated with this fsp.
- */
-
- ret = conn->vfs_ops.close(fsp,fsp->fd);
-
- if (saved_errno != 0) {
- errno = saved_errno;
- ret = -1;
- }
-
- fsp->fd = -1;
-
- return ret;
-}
-
-/****************************************************************************
- Debugging aid :-).
-****************************************************************************/
-
-static const char *posix_lock_type_name(int lock_type)
-{
- return (lock_type == F_RDLCK) ? "READ" : "WRITE";
-}
-
-/****************************************************************************
- Delete a POSIX lock entry by index number. Used if the tdb add succeeds, but
- then the POSIX fcntl lock fails.
-****************************************************************************/
-
-static BOOL delete_posix_lock_entry_by_index(files_struct *fsp, size_t entry)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- struct posix_lock *locks;
- size_t count;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_lock_tdb, kbuf);
-
- if (!dbuf.dptr) {
- DEBUG(10,("delete_posix_lock_entry_by_index: tdb_fetch failed !\n"));
- goto fail;
- }
-
- count = (size_t)(dbuf.dsize / sizeof(struct posix_lock));
- locks = (struct posix_lock *)dbuf.dptr;
-
- if (count == 1) {
- tdb_delete(posix_lock_tdb, kbuf);
- } else {
- if (entry < count-1) {
- memmove(&locks[entry], &locks[entry+1], sizeof(*locks)*((count-1) - entry));
- }
- dbuf.dsize -= sizeof(*locks);
- tdb_store(posix_lock_tdb, kbuf, dbuf, TDB_REPLACE);
- }
-
- SAFE_FREE(dbuf.dptr);
-
- return True;
-
- fail:
-
- SAFE_FREE(dbuf.dptr);
- return False;
-}
-
-/****************************************************************************
- Add an entry into the POSIX locking tdb. We return the index number of the
- added lock (used in case we need to delete *exactly* this entry). Returns
- False on fail, True on success.
-****************************************************************************/
-
-static BOOL add_posix_lock_entry(files_struct *fsp, SMB_OFF_T start, SMB_OFF_T size, int lock_type, size_t *pentry_num)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- struct posix_lock pl;
- char *tp;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_lock_tdb, kbuf);
-
- *pentry_num = (size_t)(dbuf.dsize / sizeof(pl));
-
- /*
- * Add new record.
- */
-
- pl.fd = fsp->fd;
- pl.start = start;
- pl.size = size;
- pl.lock_type = lock_type;
-
- tp = Realloc(dbuf.dptr, dbuf.dsize + sizeof(pl));
- if (!tp) {
- DEBUG(0,("add_posix_lock_entry: Realloc fail !\n"));
- goto fail;
- } else
- dbuf.dptr = tp;
-
- memcpy(dbuf.dptr + dbuf.dsize, &pl, sizeof(pl));
- dbuf.dsize += sizeof(pl);
-
- if (tdb_store(posix_lock_tdb, kbuf, dbuf, TDB_REPLACE) == -1) {
- DEBUG(0,("add_posix_lock: Failed to add lock entry on file %s\n", fsp->fsp_name));
- goto fail;
- }
-
- SAFE_FREE(dbuf.dptr);
-
- DEBUG(10,("add_posix_lock: File %s: type = %s: start=%.0f size=%.0f: dev=%.0f inode=%.0f\n",
- fsp->fsp_name, posix_lock_type_name(lock_type), (double)start, (double)size,
- (double)fsp->dev, (double)fsp->inode ));
-
- return True;
-
- fail:
-
- SAFE_FREE(dbuf.dptr);
- return False;
-}
-
-/****************************************************************************
- Calculate if locks have any overlap at all.
-****************************************************************************/
-
-static BOOL does_lock_overlap(SMB_OFF_T start1, SMB_OFF_T size1, SMB_OFF_T start2, SMB_OFF_T size2)
-{
- if (start1 >= start2 && start1 <= start2 + size2)
- return True;
-
- if (start1 < start2 && start1 + size1 > start2)
- return True;
-
- return False;
-}
-
-/****************************************************************************
- Delete an entry from the POSIX locking tdb. Returns a copy of the entry being
- deleted and the number of records that are overlapped by this one, or -1 on error.
-****************************************************************************/
-
-static int delete_posix_lock_entry(files_struct *fsp, SMB_OFF_T start, SMB_OFF_T size, struct posix_lock *pl)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- struct posix_lock *locks;
- size_t i, count;
- BOOL found = False;
- int num_overlapping_records = 0;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_lock_tdb, kbuf);
-
- if (!dbuf.dptr) {
- DEBUG(10,("delete_posix_lock_entry: tdb_fetch failed !\n"));
- goto fail;
- }
-
- /* There are existing locks - find a match. */
- locks = (struct posix_lock *)dbuf.dptr;
- count = (size_t)(dbuf.dsize / sizeof(*locks));
-
- /*
- * Search for and delete the first record that matches the
- * unlock criteria.
- */
-
- for (i=0; i<count; i++) {
- struct posix_lock *entry = &locks[i];
-
- if (entry->fd == fsp->fd &&
- entry->start == start &&
- entry->size == size) {
-
- /* Make a copy if requested. */
- if (pl)
- *pl = *entry;
-
- /* Found it - delete it. */
- if (count == 1) {
- tdb_delete(posix_lock_tdb, kbuf);
- } else {
- if (i < count-1) {
- memmove(&locks[i], &locks[i+1], sizeof(*locks)*((count-1) - i));
- }
- dbuf.dsize -= sizeof(*locks);
- tdb_store(posix_lock_tdb, kbuf, dbuf, TDB_REPLACE);
- }
- count--;
- found = True;
- break;
- }
- }
-
- if (!found)
- goto fail;
-
- /*
- * Count the number of entries that are
- * overlapped by this unlock request.
- */
-
- for (i = 0; i < count; i++) {
- struct posix_lock *entry = &locks[i];
-
- if (fsp->fd == entry->fd &&
- does_lock_overlap( start, size, entry->start, entry->size))
- num_overlapping_records++;
- }
-
- DEBUG(10,("delete_posix_lock_entry: type = %s: start=%.0f size=%.0f, num_records = %d\n",
- posix_lock_type_name(pl->lock_type), (double)pl->start, (double)pl->size,
- (unsigned int)num_overlapping_records ));
-
- SAFE_FREE(dbuf.dptr);
-
- return num_overlapping_records;
-
- fail:
-
- SAFE_FREE(dbuf.dptr);
- return -1;
-}
-
-/****************************************************************************
- Utility function to map a lock type correctly depending on the open
- mode of a file.
-****************************************************************************/
-
-static int map_posix_lock_type( files_struct *fsp, enum brl_type lock_type)
-{
- if((lock_type == WRITE_LOCK) && !fsp->can_write) {
- /*
- * Many UNIX's cannot get a write lock on a file opened read-only.
- * Win32 locking semantics allow this.
- * Do the best we can and attempt a read-only lock.
- */
- DEBUG(10,("map_posix_lock_type: Downgrading write lock to read due to read-only file.\n"));
- return F_RDLCK;
- } else if((lock_type == READ_LOCK) && !fsp->can_read) {
- /*
- * Ditto for read locks on write only files.
- */
- DEBUG(10,("map_posix_lock_type: Changing read lock to write due to write-only file.\n"));
- return F_WRLCK;
- }
-
- /*
- * This return should be the most normal, as we attempt
- * to always open files read/write.
- */
-
- return (lock_type == READ_LOCK) ? F_RDLCK : F_WRLCK;
-}
-
-/****************************************************************************
- Check to see if the given unsigned lock range is within the possible POSIX
- range. Modifies the given args to be in range if possible, just returns
- False if not.
-****************************************************************************/
-
-static BOOL posix_lock_in_range(SMB_OFF_T *offset_out, SMB_OFF_T *count_out,
- SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count)
-{
- SMB_OFF_T offset = (SMB_OFF_T)u_offset;
- SMB_OFF_T count = (SMB_OFF_T)u_count;
-
- /*
- * For the type of system we are, attempt to
- * find the maximum positive lock offset as an SMB_OFF_T.
- */
-
-#if defined(MAX_POSITIVE_LOCK_OFFSET) /* Some systems have arbitrary limits. */
-
- SMB_OFF_T max_positive_lock_offset = (MAX_POSITIVE_LOCK_OFFSET);
-
-#elif defined(LARGE_SMB_OFF_T) && !defined(HAVE_BROKEN_FCNTL64_LOCKS)
-
- /*
- * In this case SMB_OFF_T is 64 bits,
- * and the underlying system can handle 64 bit signed locks.
- */
-
- SMB_OFF_T mask2 = ((SMB_OFF_T)0x4) << (SMB_OFF_T_BITS-4);
- SMB_OFF_T mask = (mask2<<1);
- SMB_OFF_T max_positive_lock_offset = ~mask;
-
-#else /* !LARGE_SMB_OFF_T || HAVE_BROKEN_FCNTL64_LOCKS */
-
- /*
- * In this case either SMB_OFF_T is 32 bits,
- * or the underlying system cannot handle 64 bit signed locks.
- * All offsets & counts must be 2^31 or less.
- */
-
- SMB_OFF_T max_positive_lock_offset = 0x7FFFFFFF;
-
-#endif /* !LARGE_SMB_OFF_T || HAVE_BROKEN_FCNTL64_LOCKS */
-
- /*
- * POSIX locks of length zero mean lock to end-of-file.
- * Win32 locks of length zero are point probes. Ignore
- * any Win32 locks of length zero. JRA.
- */
-
- if (count == (SMB_OFF_T)0) {
- DEBUG(10,("posix_lock_in_range: count = 0, ignoring.\n"));
- return False;
- }
-
- /*
- * If the given offset was > max_positive_lock_offset then we cannot map this at all
- * ignore this lock.
- */
-
- if (u_offset & ~((SMB_BIG_UINT)max_positive_lock_offset)) {
- DEBUG(10,("posix_lock_in_range: (offset = %.0f) offset > %.0f and we cannot handle this. Ignoring lock.\n",
- (double)u_offset, (double)((SMB_BIG_UINT)max_positive_lock_offset) ));
- return False;
- }
-
- /*
- * We must truncate the count to less than max_positive_lock_offset.
- */
-
- if (u_count & ~((SMB_BIG_UINT)max_positive_lock_offset))
- count = max_positive_lock_offset;
-
- /*
- * Truncate count to end at max lock offset.
- */
-
- if (offset + count < 0 || offset + count > max_positive_lock_offset)
- count = max_positive_lock_offset - offset;
-
- /*
- * If we ate all the count, ignore this lock.
- */
-
- if (count == 0) {
- DEBUG(10,("posix_lock_in_range: Count = 0. Ignoring lock u_offset = %.0f, u_count = %.0f\n",
- (double)u_offset, (double)u_count ));
- return False;
- }
-
- /*
- * The mapping was successful.
- */
-
- DEBUG(10,("posix_lock_in_range: offset_out = %.0f, count_out = %.0f\n",
- (double)offset, (double)count ));
-
- *offset_out = offset;
- *count_out = count;
-
- return True;
-}
-
-/****************************************************************************
- Actual function that does POSIX locks. Copes with 64 -> 32 bit cruft and
- broken NFS implementations.
-****************************************************************************/
-
-static BOOL posix_fcntl_lock(files_struct *fsp, int op, SMB_OFF_T offset, SMB_OFF_T count, int type)
-{
- int ret;
- struct tcon_context *conn = fsp->conn;
-
- DEBUG(8,("posix_fcntl_lock %d %d %.0f %.0f %d\n",fsp->fd,op,(double)offset,(double)count,type));
-
- ret = conn->vfs_ops.lock(fsp,fsp->fd,op,offset,count,type);
-
- if (!ret && ((errno == EFBIG) || (errno == ENOLCK) || (errno == EINVAL))) {
-
- DEBUG(0,("posix_fcntl_lock: WARNING: lock request at offset %.0f, length %.0f returned\n",
- (double)offset,(double)count));
- DEBUG(0,("an %s error. This can happen when using 64 bit lock offsets\n", strerror(errno)));
- DEBUG(0,("on 32 bit NFS mounted file systems.\n"));
-
- /*
- * If the offset is > 0x7FFFFFFF then this will cause problems on
- * 32 bit NFS mounted filesystems. Just ignore it.
- */
-
- if (offset & ~((SMB_OFF_T)0x7fffffff)) {
- DEBUG(0,("Offset greater than 31 bits. Returning success.\n"));
- return True;
- }
-
- if (count & ~((SMB_OFF_T)0x7fffffff)) {
- /* 32 bit NFS file system, retry with smaller offset */
- DEBUG(0,("Count greater than 31 bits - retrying with 31 bit truncated length.\n"));
- errno = 0;
- count &= 0x7fffffff;
- ret = conn->vfs_ops.lock(fsp,fsp->fd,op,offset,count,type);
- }
- }
-
- DEBUG(8,("posix_fcntl_lock: Lock call %s\n", ret ? "successful" : "failed"));
-
- return ret;
-}
-
-/****************************************************************************
- POSIX function to see if a file region is locked. Returns True if the
- region is locked, False otherwise.
-****************************************************************************/
-
-BOOL is_posix_locked(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count, enum brl_type lock_type)
-{
- SMB_OFF_T offset;
- SMB_OFF_T count;
- int posix_lock_type = map_posix_lock_type(fsp,lock_type);
-
- DEBUG(10,("is_posix_locked: File %s, offset = %.0f, count = %.0f, type = %s\n",
- fsp->fsp_name, (double)u_offset, (double)u_count, posix_lock_type_name(lock_type) ));
-
- /*
- * If the requested lock won't fit in the POSIX range, we will
- * never set it, so presume it is not locked.
- */
-
- if(!posix_lock_in_range(&offset, &count, u_offset, u_count))
- return False;
-
- /*
- * Note that most UNIX's can *test* for a write lock on
- * a read-only fd, just not *set* a write lock on a read-only
- * fd. So we don't need to use map_lock_type here.
- */
-
- return posix_fcntl_lock(fsp,SMB_F_GETLK,offset,count,posix_lock_type);
-}
-
-/*
- * Structure used when splitting a lock range
- * into a POSIX lock range. Doubly linked list.
- */
-
-struct lock_list {
- struct lock_list *next;
- struct lock_list *prev;
- SMB_OFF_T start;
- SMB_OFF_T size;
-};
-
-/****************************************************************************
- Create a list of lock ranges that don't overlap a given range. Used in calculating
- POSIX locks and unlocks. This is a difficult function that requires ASCII art to
- understand it :-).
-****************************************************************************/
-
-static struct lock_list *posix_lock_list(TALLOC_CTX *ctx, struct lock_list *lhead, files_struct *fsp)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
- TDB_DATA dbuf;
- struct posix_lock *locks;
- size_t num_locks, i;
-
- dbuf.dptr = NULL;
-
- dbuf = tdb_fetch(posix_lock_tdb, kbuf);
-
- if (!dbuf.dptr)
- return lhead;
-
- locks = (struct posix_lock *)dbuf.dptr;
- num_locks = (size_t)(dbuf.dsize / sizeof(*locks));
-
- /*
- * Check the current lock list on this dev/inode pair.
- * Quit if the list is deleted.
- */
-
- DEBUG(10,("posix_lock_list: curr: start=%.0f,size=%.0f\n",
- (double)lhead->start, (double)lhead->size ));
-
- for (i=0; i<num_locks && lhead; i++) {
-
- struct posix_lock *lock = &locks[i];
- struct lock_list *l_curr;
-
- /*
- * Walk the lock list, checking for overlaps. Note that
- * the lock list can expand within this loop if the current
- * range being examined needs to be split.
- */
-
- for (l_curr = lhead; l_curr;) {
-
- DEBUG(10,("posix_lock_list: lock: fd=%d: start=%.0f,size=%.0f:type=%s", lock->fd,
- (double)lock->start, (double)lock->size, posix_lock_type_name(lock->lock_type) ));
-
- if ( (l_curr->start >= (lock->start + lock->size)) ||
- (lock->start >= (l_curr->start + l_curr->size))) {
-
- /* No overlap with this lock - leave this range alone. */
-/*********************************************
- +---------+
- | l_curr |
- +---------+
- +-------+
- | lock |
- +-------+
-OR....
- +---------+
- | l_curr |
- +---------+
-**********************************************/
-
- DEBUG(10,("no overlap case.\n" ));
-
- l_curr = l_curr->next;
-
- } else if ( (l_curr->start >= lock->start) &&
- (l_curr->start + l_curr->size <= lock->start + lock->size) ) {
-
- /*
- * This unlock is completely overlapped by this existing lock range
- * and thus should have no effect (not be unlocked). Delete it from the list.
- */
-/*********************************************
- +---------+
- | l_curr |
- +---------+
- +---------------------------+
- | lock |
- +---------------------------+
-**********************************************/
- /* Save the next pointer */
- struct lock_list *ul_next = l_curr->next;
-
- DEBUG(10,("delete case.\n" ));
-
- DLIST_REMOVE(lhead, l_curr);
- if(lhead == NULL)
- break; /* No more list... */
-
- l_curr = ul_next;
-
- } else if ( (l_curr->start >= lock->start) &&
- (l_curr->start < lock->start + lock->size) &&
- (l_curr->start + l_curr->size > lock->start + lock->size) ) {
-
- /*
- * This unlock overlaps the existing lock range at the high end.
- * Truncate by moving start to existing range end and reducing size.
- */
-/*********************************************
- +---------------+
- | l_curr |
- +---------------+
- +---------------+
- | lock |
- +---------------+
-BECOMES....
- +-------+
- | l_curr|
- +-------+
-**********************************************/
-
- l_curr->size = (l_curr->start + l_curr->size) - (lock->start + lock->size);
- l_curr->start = lock->start + lock->size;
-
- DEBUG(10,("truncate high case: start=%.0f,size=%.0f\n",
- (double)l_curr->start, (double)l_curr->size ));
-
- l_curr = l_curr->next;
-
- } else if ( (l_curr->start < lock->start) &&
- (l_curr->start + l_curr->size > lock->start) &&
- (l_curr->start + l_curr->size <= lock->start + lock->size) ) {
-
- /*
- * This unlock overlaps the existing lock range at the low end.
- * Truncate by reducing size.
- */
-/*********************************************
- +---------------+
- | l_curr |
- +---------------+
- +---------------+
- | lock |
- +---------------+
-BECOMES....
- +-------+
- | l_curr|
- +-------+
-**********************************************/
-
- l_curr->size = lock->start - l_curr->start;
-
- DEBUG(10,("truncate low case: start=%.0f,size=%.0f\n",
- (double)l_curr->start, (double)l_curr->size ));
-
- l_curr = l_curr->next;
-
- } else if ( (l_curr->start < lock->start) &&
- (l_curr->start + l_curr->size > lock->start + lock->size) ) {
- /*
- * Worst case scenario. Unlock request completely overlaps an existing
- * lock range. Split the request into two, push the new (upper) request
- * into the dlink list, and continue with the entry after ul_new (as we
- * know that ul_new will not overlap with this lock).
- */
-/*********************************************
- +---------------------------+
- | l_curr |
- +---------------------------+
- +---------+
- | lock |
- +---------+
-BECOMES.....
- +-------+ +---------+
- | l_curr| | l_new |
- +-------+ +---------+
-**********************************************/
- struct lock_list *l_new = (struct lock_list *)talloc(ctx,
- sizeof(struct lock_list));
-
- if(l_new == NULL) {
- DEBUG(0,("posix_lock_list: talloc fail.\n"));
- return NULL; /* The talloc_destroy takes care of cleanup. */
- }
-
- ZERO_STRUCTP(l_new);
- l_new->start = lock->start + lock->size;
- l_new->size = l_curr->start + l_curr->size - l_new->start;
-
- /* Truncate the l_curr. */
- l_curr->size = lock->start - l_curr->start;
-
- DEBUG(10,("split case: curr: start=%.0f,size=%.0f \
-new: start=%.0f,size=%.0f\n", (double)l_curr->start, (double)l_curr->size,
- (double)l_new->start, (double)l_new->size ));
-
- /*
- * Add into the dlink list after the l_curr point - NOT at lhead.
- * Note we can't use DLINK_ADD here as this inserts at the head of the given list.
- */
-
- l_new->prev = l_curr;
- l_new->next = l_curr->next;
- l_curr->next = l_new;
-
- /* And move after the link we added. */
- l_curr = l_new->next;
-
- } else {
-
- /*
- * This logic case should never happen. Ensure this is the
- * case by forcing an abort.... Remove in production.
- */
- pstring msg;
-
- slprintf(msg, sizeof(msg)-1, "logic flaw in cases: l_curr: start = %.0f, size = %.0f : \
-lock: start = %.0f, size = %.0f\n", (double)l_curr->start, (double)l_curr->size, (double)lock->start, (double)lock->size );
-
- smb_panic(msg);
- }
- } /* end for ( l_curr = lhead; l_curr;) */
- } /* end for (i=0; i<num_locks && ul_head; i++) */
-
- SAFE_FREE(dbuf.dptr);
-
- return lhead;
-}
-
-/****************************************************************************
- POSIX function to acquire a lock. Returns True if the
- lock could be granted, False if not.
-****************************************************************************/
-
-BOOL set_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count, enum brl_type lock_type)
-{
- SMB_OFF_T offset;
- SMB_OFF_T count;
- BOOL ret = True;
- size_t entry_num = 0;
- size_t lock_count;
- TALLOC_CTX *l_ctx = NULL;
- struct lock_list *llist = NULL;
- struct lock_list *ll = NULL;
- int posix_lock_type = map_posix_lock_type(fsp,lock_type);
-
- DEBUG(5,("set_posix_lock: File %s, offset = %.0f, count = %.0f, type = %s\n",
- fsp->fsp_name, (double)u_offset, (double)u_count, posix_lock_type_name(lock_type) ));
-
- /*
- * If the requested lock won't fit in the POSIX range, we will
- * pretend it was successful.
- */
-
- if(!posix_lock_in_range(&offset, &count, u_offset, u_count))
- return True;
-
- /*
- * Windows is very strange. It allows read locks to be overlayed
- * (even over a write lock), but leaves the write lock in force until the first
- * unlock. It also reference counts the locks. This means the following sequence :
- *
- * process1 process2
- * ------------------------------------------------------------------------
- * WRITE LOCK : start = 2, len = 10
- * READ LOCK: start =0, len = 10 - FAIL
- * READ LOCK : start = 0, len = 14
- * READ LOCK: start =0, len = 10 - FAIL
- * UNLOCK : start = 2, len = 10
- * READ LOCK: start =0, len = 10 - OK
- *
- * Under POSIX, the same sequence in steps 1 and 2 would not be reference counted, but
- * would leave a single read lock over the 0-14 region. In order to
- * re-create Windows semantics mapped to POSIX locks, we create multiple TDB
- * entries, one for each overlayed lock request. We are guarenteed by the brlock
- * semantics that if a write lock is added, then it will be first in the array.
- */
-
- if ((l_ctx = talloc_init("set_posix_lock")) == NULL) {
- DEBUG(0,("set_posix_lock: unable to init talloc context.\n"));
- return True; /* Not a fatal error. */
- }
-
- if ((ll = (struct lock_list *)talloc(l_ctx, sizeof(struct lock_list))) == NULL) {
- DEBUG(0,("set_posix_lock: unable to talloc unlock list.\n"));
- talloc_destroy(l_ctx);
- return True; /* Not a fatal error. */
- }
-
- /*
- * Create the initial list entry containing the
- * lock we want to add.
- */
-
- ZERO_STRUCTP(ll);
- ll->start = offset;
- ll->size = count;
-
- DLIST_ADD(llist, ll);
-
- /*
- * The following call calculates if there are any
- * overlapping locks held by this process on
- * fd's open on the same file and splits this list
- * into a list of lock ranges that do not overlap with existing
- * POSIX locks.
- */
-
- llist = posix_lock_list(l_ctx, llist, fsp);
-
- /*
- * Now we have the list of ranges to lock it is safe to add the
- * entry into the POSIX lock tdb. We take note of the entry we
- * added here in case we have to remove it on POSIX lock fail.
- */
-
- if (!add_posix_lock_entry(fsp,offset,count,posix_lock_type,&entry_num)) {
- DEBUG(0,("set_posix_lock: Unable to create posix lock entry !\n"));
- talloc_destroy(l_ctx);
- return False;
- }
-
- /*
- * Add the POSIX locks on the list of ranges returned.
- * As the lock is supposed to be added atomically, we need to
- * back out all the locks if any one of these calls fail.
- */
-
- for (lock_count = 0, ll = llist; ll; ll = ll->next, lock_count++) {
- offset = ll->start;
- count = ll->size;
-
- DEBUG(5,("set_posix_lock: Real lock: Type = %s: offset = %.0f, count = %.0f\n",
- posix_lock_type_name(posix_lock_type), (double)offset, (double)count ));
-
- if (!posix_fcntl_lock(fsp,SMB_F_SETLK,offset,count,posix_lock_type)) {
- DEBUG(5,("set_posix_lock: Lock fail !: Type = %s: offset = %.0f, count = %.0f. Errno = %s\n",
- posix_lock_type_name(posix_lock_type), (double)offset, (double)count, strerror(errno) ));
- ret = False;
- break;
- }
- }
-
- if (!ret) {
-
- /*
- * Back out all the POSIX locks we have on fail.
- */
-
- for (ll = llist; lock_count; ll = ll->next, lock_count--) {
- offset = ll->start;
- count = ll->size;
-
- DEBUG(5,("set_posix_lock: Backing out locks: Type = %s: offset = %.0f, count = %.0f\n",
- posix_lock_type_name(posix_lock_type), (double)offset, (double)count ));
-
- posix_fcntl_lock(fsp,SMB_F_SETLK,offset,count,F_UNLCK);
- }
-
- /*
- * Remove the tdb entry for this lock.
- */
-
- delete_posix_lock_entry_by_index(fsp,entry_num);
- }
-
- talloc_destroy(l_ctx);
- return ret;
-}
-
-/****************************************************************************
- POSIX function to release a lock. Returns True if the
- lock could be released, False if not.
-****************************************************************************/
-
-BOOL release_posix_lock(files_struct *fsp, SMB_BIG_UINT u_offset, SMB_BIG_UINT u_count)
-{
- SMB_OFF_T offset;
- SMB_OFF_T count;
- BOOL ret = True;
- TALLOC_CTX *ul_ctx = NULL;
- struct lock_list *ulist = NULL;
- struct lock_list *ul = NULL;
- struct posix_lock deleted_lock;
- int num_overlapped_entries;
-
- DEBUG(5,("release_posix_lock: File %s, offset = %.0f, count = %.0f\n",
- fsp->fsp_name, (double)u_offset, (double)u_count ));
-
- /*
- * If the requested lock won't fit in the POSIX range, we will
- * pretend it was successful.
- */
-
- if(!posix_lock_in_range(&offset, &count, u_offset, u_count))
- return True;
-
- /*
- * We treat this as one unlock request for POSIX accounting purposes even
- * if it may later be split into multiple smaller POSIX unlock ranges.
- * num_overlapped_entries is the number of existing locks that have any
- * overlap with this unlock request.
- */
-
- num_overlapped_entries = delete_posix_lock_entry(fsp, offset, count, &deleted_lock);
-
- if (num_overlapped_entries == -1) {
- smb_panic("release_posix_lock: unable find entry to delete !\n");
- }
-
- /*
- * If num_overlapped_entries is > 0, and the lock_type we just deleted from the tdb was
- * a POSIX write lock, then before doing the unlock we need to downgrade
- * the POSIX lock to a read lock. This allows any overlapping read locks
- * to be atomically maintained.
- */
-
- if (num_overlapped_entries > 0 && deleted_lock.lock_type == F_WRLCK) {
- if (!posix_fcntl_lock(fsp,SMB_F_SETLK,offset,count,F_RDLCK)) {
- DEBUG(0,("release_posix_lock: downgrade of lock failed with error %s !\n", strerror(errno) ));
- return False;
- }
- }
-
- if ((ul_ctx = talloc_init("release_posix_lock")) == NULL) {
- DEBUG(0,("release_posix_lock: unable to init talloc context.\n"));
- return True; /* Not a fatal error. */
- }
-
- if ((ul = (struct lock_list *)talloc(ul_ctx, sizeof(struct lock_list))) == NULL) {
- DEBUG(0,("release_posix_lock: unable to talloc unlock list.\n"));
- talloc_destroy(ul_ctx);
- return True; /* Not a fatal error. */
- }
-
- /*
- * Create the initial list entry containing the
- * lock we want to remove.
- */
-
- ZERO_STRUCTP(ul);
- ul->start = offset;
- ul->size = count;
-
- DLIST_ADD(ulist, ul);
-
- /*
- * The following call calculates if there are any
- * overlapping locks held by this process on
- * fd's open on the same file and creates a
- * list of unlock ranges that will allow
- * POSIX lock ranges to remain on the file whilst the
- * unlocks are performed.
- */
-
- ulist = posix_lock_list(ul_ctx, ulist, fsp);
-
- /*
- * Release the POSIX locks on the list of ranges returned.
- */
-
- for(; ulist; ulist = ulist->next) {
- offset = ulist->start;
- count = ulist->size;
-
- DEBUG(5,("release_posix_lock: Real unlock: offset = %.0f, count = %.0f\n",
- (double)offset, (double)count ));
-
- if (!posix_fcntl_lock(fsp,SMB_F_SETLK,offset,count,F_UNLCK))
- ret = False;
- }
-
- talloc_destroy(ul_ctx);
-
- return ret;
-}
-
-/****************************************************************************
- Remove all lock entries for a specific dev/inode pair from the tdb.
-****************************************************************************/
-
-static void delete_posix_lock_entries(files_struct *fsp)
-{
- TDB_DATA kbuf = locking_key_fsp(fsp);
-
- if (tdb_delete(posix_lock_tdb, kbuf) == -1)
- DEBUG(0,("delete_close_entries: tdb_delete fail !\n"));
-}
-
-/****************************************************************************
- Debug function.
-****************************************************************************/
-
-static void dump_entry(struct posix_lock *pl)
-{
- DEBUG(10,("entry: start=%.0f, size=%.0f, type=%d, fd=%i\n",
- (double)pl->start, (double)pl->size, (int)pl->lock_type, pl->fd ));
-}
-
-/****************************************************************************
- Remove any locks on this fd. Called from file_close().
-****************************************************************************/
-
-void posix_locking_close_file(files_struct *fsp)
-{
- struct posix_lock *entries = NULL;
- size_t count, i;
-
- /*
- * Optimization for the common case where we are the only
- * opener of a file. If all fd entries are our own, we don't
- * need to explicitly release all the locks via the POSIX functions,
- * we can just remove all the entries in the tdb and allow the
- * close to remove the real locks.
- */
-
- count = get_posix_lock_entries(fsp, &entries);
-
- if (count == 0) {
- DEBUG(10,("posix_locking_close_file: file %s has no outstanding locks.\n", fsp->fsp_name ));
- return;
- }
-
- for (i = 0; i < count; i++) {
- if (entries[i].fd != fsp->fd )
- break;
-
- dump_entry(&entries[i]);
- }
-
- if (i == count) {
- /* All locks are ours. */
- DEBUG(10,("posix_locking_close_file: file %s has %u outstanding locks, but all on one fd.\n",
- fsp->fsp_name, (unsigned int)count ));
- SAFE_FREE(entries);
- delete_posix_lock_entries(fsp);
- return;
- }
-
- /*
- * Difficult case. We need to delete all our locks, whilst leaving
- * all other POSIX locks in place.
- */
-
- for (i = 0; i < count; i++) {
- struct posix_lock *pl = &entries[i];
- if (pl->fd == fsp->fd)
- release_posix_lock(fsp, (SMB_BIG_UINT)pl->start, (SMB_BIG_UINT)pl->size );
- }
- SAFE_FREE(entries);
-}
-
-/*******************************************************************
- Create the in-memory POSIX lock databases.
-********************************************************************/
-
-BOOL posix_locking_init(int read_only)
-{
- if (posix_lock_tdb && posix_pending_close_tdb)
- return True;
-
- if (!posix_lock_tdb)
- posix_lock_tdb = tdb_open_log(NULL, 0, TDB_INTERNAL,
- read_only?O_RDONLY:(O_RDWR|O_CREAT), 0644);
- if (!posix_lock_tdb) {
- DEBUG(0,("Failed to open POSIX byte range locking database.\n"));
- return False;
- }
- if (!posix_pending_close_tdb)
- posix_pending_close_tdb = tdb_open_log(NULL, 0, TDB_INTERNAL,
- read_only?O_RDONLY:(O_RDWR|O_CREAT), 0644);
- if (!posix_pending_close_tdb) {
- DEBUG(0,("Failed to open POSIX pending close database.\n"));
- return False;
- }
-
- return True;
-}
-
-/*******************************************************************
- Delete the in-memory POSIX lock databases.
-********************************************************************/
-
-BOOL posix_locking_end(void)
-{
- if (posix_lock_tdb && tdb_close(posix_lock_tdb) != 0)
- return False;
- if (posix_pending_close_tdb && tdb_close(posix_pending_close_tdb) != 0)
- return False;
- return True;
-}