/*
- Unix SMB/Netbios implementation.
- Version 3.0
+ Unix SMB/CIFS implementation.
byte range locking code
Updated to handle range splits/merges.
#include "includes.h"
-extern int DEBUGLEVEL;
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
-/* 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;
-};
+#define ZERO_ZERO 0
/* The open brlock.tdb database. */
-static TDB_CONTEXT *tdb;
+static struct db_context *brlock_db;
/****************************************************************************
- Create a locking key - ensuring zero filled for pad purposes.
+ Debug info at level 10 for lock struct.
****************************************************************************/
-static TDB_DATA locking_key(SMB_DEV_T dev, SMB_INO_T inode)
+static void print_lock_struct(unsigned int i, struct lock_struct *pls)
{
- 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;
+ DEBUG(10,("[%u]: smbpid = %u, tid = %u, pid = %u, ",
+ i,
+ (unsigned int)pls->context.smbpid,
+ (unsigned int)pls->context.tid,
+ (unsigned int)procid_to_pid(&pls->context.pid) ));
+
+ DEBUG(10,("start = %.0f, size = %.0f, fnum = %d, %s %s\n",
+ (double)pls->start,
+ (double)pls->size,
+ pls->fnum,
+ lock_type_name(pls->lock_type),
+ lock_flav_name(pls->lock_flav) ));
}
/****************************************************************************
See if two locking contexts are equal.
****************************************************************************/
-static BOOL brl_same_context(struct lock_context *ctx1,
- struct lock_context *ctx2)
+BOOL brl_same_context(const struct lock_context *ctx1,
+ const struct lock_context *ctx2)
{
- return (ctx1->pid == ctx2->pid) &&
+ return (procid_equal(&ctx1->pid, &ctx2->pid) &&
(ctx1->smbpid == ctx2->smbpid) &&
- (ctx1->tid == ctx2->tid);
+ (ctx1->tid == ctx2->tid));
+}
+
+/****************************************************************************
+ See if lck1 and lck2 overlap.
+****************************************************************************/
+
+static BOOL brl_overlap(const struct lock_struct *lck1,
+ const struct lock_struct *lck2)
+{
+ /* this extra check is not redundent - it copes with locks
+ that go beyond the end of 64 bit file space */
+ if (lck1->size != 0 &&
+ lck1->start == lck2->start &&
+ lck1->size == lck2->size) {
+ return True;
+ }
+
+ if (lck1->start >= (lck2->start+lck2->size) ||
+ lck2->start >= (lck1->start+lck1->size)) {
+ return False;
+ }
+ return True;
}
/****************************************************************************
See if lock2 can be added when lock1 is in place.
****************************************************************************/
-static BOOL brl_conflict(struct lock_struct *lck1,
- struct lock_struct *lck2)
+static BOOL brl_conflict(const struct lock_struct *lck1,
+ const struct lock_struct *lck2)
{
- if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK)
+ /* Ignore PENDING locks. */
+ if (IS_PENDING_LOCK(lck1->lock_type) || IS_PENDING_LOCK(lck2->lock_type))
+ return False;
+
+ /* Read locks never conflict. */
+ 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;
+ }
+
+ return brl_overlap(lck1, lck2);
+}
+
+/****************************************************************************
+ See if lock2 can be added when lock1 is in place - when both locks are POSIX
+ flavour. POSIX locks ignore fnum - they only care about dev/ino which we
+ know already match.
+****************************************************************************/
+
+static BOOL brl_conflict_posix(const struct lock_struct *lck1,
+ const struct lock_struct *lck2)
+{
+#if defined(DEVELOPER)
+ SMB_ASSERT(lck1->lock_flav == POSIX_LOCK);
+ SMB_ASSERT(lck2->lock_flav == POSIX_LOCK);
+#endif
+
+ /* Ignore PENDING locks. */
+ if (IS_PENDING_LOCK(lck1->lock_type) || IS_PENDING_LOCK(lck2->lock_type))
+ return False;
+
+ /* Read locks never conflict. */
+ if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK) {
+ return False;
+ }
+
+ /* Locks on the same context con't conflict. Ignore fnum. */
+ if (brl_same_context(&lck1->context, &lck2->context)) {
+ return False;
+ }
+
+ /* One is read, the other write, or the context is different,
+ do they overlap ? */
+ return brl_overlap(lck1, lck2);
+}
+
+#if ZERO_ZERO
+static BOOL brl_conflict1(const struct lock_struct *lck1,
+ const struct lock_struct *lck2)
+{
+ if (IS_PENDING_LOCK(lck1->lock_type) || IS_PENDING_LOCK(lck2->lock_type))
+ 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;
+ 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;
+ lck2->start >= (lck1->start + lck1->size)) {
+ return False;
+ }
return True;
}
-
+#endif
/****************************************************************************
-delete a record if it is for a dead process
+ Check to see if this lock conflicts, but ignore our own locks on the
+ same fnum only. This is the read/write lock check code path.
+ This is never used in the POSIX lock case.
****************************************************************************/
-static int delete_fn(TDB_CONTEXT *ttdb, TDB_DATA kbuf, TDB_DATA dbuf, void *state)
+
+static BOOL brl_conflict_other(const struct lock_struct *lck1, const struct lock_struct *lck2)
{
- struct lock_struct *locks;
- struct lock_key *key;
- int count, i;
+ if (IS_PENDING_LOCK(lck1->lock_type) || IS_PENDING_LOCK(lck2->lock_type))
+ return False;
- tdb_lockchain(tdb, kbuf);
+ if (lck1->lock_type == READ_LOCK && lck2->lock_type == READ_LOCK)
+ return False;
- locks = (struct lock_struct *)dbuf.dptr;
- key = (struct lock_key *)kbuf.dptr;
+ /* POSIX flavour locks never conflict here - this is only called
+ in the read/write path. */
- count = dbuf.dsize / sizeof(*locks);
- for (i=0; i<count; i++) {
- struct lock_struct *lock = &locks[i];
+ if (lck1->lock_flav == POSIX_LOCK && lck2->lock_flav == POSIX_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;
+ }
+
+ return brl_overlap(lck1, lck2);
+}
+
+/****************************************************************************
+ Check if an unlock overlaps a pending lock.
+****************************************************************************/
+
+static BOOL brl_pending_overlap(const struct lock_struct *lock, const 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;
+}
- if (process_exists(lock->context.pid)) continue;
+/****************************************************************************
+ Amazingly enough, w2k3 "remembers" whether the last lock failure on a fnum
+ is the same as this one and changes its error code. I wonder if any
+ app depends on this ?
+****************************************************************************/
- if (count > 1 && i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
+static NTSTATUS brl_lock_failed(files_struct *fsp, const struct lock_struct *lock, BOOL blocking_lock)
+{
+ if (lock->start >= 0xEF000000 && (lock->start >> 63) == 0) {
+ /* amazing the little things you learn with a test
+ suite. Locks beyond this offset (as a 64 bit
+ number!) always generate the conflict error code,
+ unless the top bit is set */
+ if (!blocking_lock) {
+ fsp->last_lock_failure = *lock;
}
- count--;
- i--;
+ return NT_STATUS_FILE_LOCK_CONFLICT;
}
- 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);
+ if (procid_equal(&lock->context.pid, &fsp->last_lock_failure.context.pid) &&
+ lock->context.tid == fsp->last_lock_failure.context.tid &&
+ lock->fnum == fsp->last_lock_failure.fnum &&
+ lock->start == fsp->last_lock_failure.start) {
+ return NT_STATUS_FILE_LOCK_CONFLICT;
}
- tdb_unlockchain(tdb, kbuf);
- return 0;
+ if (!blocking_lock) {
+ fsp->last_lock_failure = *lock;
+ }
+ return NT_STATUS_LOCK_NOT_GRANTED;
}
/****************************************************************************
Open up the brlock.tdb database.
****************************************************************************/
+
void brl_init(int read_only)
{
- if (tdb) return;
- tdb = tdb_open(lock_path("brlock.tdb"), 0, 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"));
+ if (brlock_db) {
return;
}
+ brlock_db = db_open(NULL, lock_path("brlock.tdb"),
+ lp_open_files_db_hash_size(),
+ TDB_DEFAULT
+ |TDB_VOLATILE
+ |(read_only?0x0:TDB_CLEAR_IF_FIRST),
+ read_only?O_RDONLY:(O_RDWR|O_CREAT), 0644 );
+ if (!brlock_db) {
+ DEBUG(0,("Failed to open byte range locking database %s\n",
+ lock_path("brlock.tdb")));
+ return;
+ }
+}
- /* delete any dead locks */
- if (!read_only) {
- tdb_traverse(tdb, delete_fn, NULL);
+/****************************************************************************
+ Close down the brlock.tdb database.
+****************************************************************************/
+
+void brl_shutdown(int read_only)
+{
+ if (!brlock_db) {
+ return;
}
+ TALLOC_FREE(brlock_db);
}
+#if ZERO_ZERO
+/****************************************************************************
+ Compare two locks for sorting.
+****************************************************************************/
+
+static int lock_compare(const struct lock_struct *lck1,
+ const 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.
+ Lock a range of bytes - Windows lock semantics.
+****************************************************************************/
+
+static NTSTATUS brl_lock_windows(struct byte_range_lock *br_lck,
+ struct lock_struct *plock, BOOL blocking_lock)
+{
+ unsigned int i;
+ files_struct *fsp = br_lck->fsp;
+ struct lock_struct *locks = br_lck->lock_data;
+
+ for (i=0; i < br_lck->num_locks; i++) {
+ /* Do any Windows or POSIX locks conflict ? */
+ if (brl_conflict(&locks[i], plock)) {
+ /* Remember who blocked us. */
+ plock->context.smbpid = locks[i].context.smbpid;
+ return brl_lock_failed(fsp,plock,blocking_lock);
+ }
+#if ZERO_ZERO
+ if (plock->start == 0 && plock->size == 0 &&
+ locks[i].size == 0) {
+ break;
+ }
+#endif
+ }
+
+ /* We can get the Windows lock, now see if it needs to
+ be mapped into a lower level POSIX one, and if so can
+ we get it ? */
+
+ if (!IS_PENDING_LOCK(plock->lock_type) && lp_posix_locking(fsp->conn->params)) {
+ int errno_ret;
+ if (!set_posix_lock_windows_flavour(fsp,
+ plock->start,
+ plock->size,
+ plock->lock_type,
+ &plock->context,
+ locks,
+ br_lck->num_locks,
+ &errno_ret)) {
+
+ /* We don't know who blocked us. */
+ plock->context.smbpid = 0xFFFFFFFF;
+
+ if (errno_ret == EACCES || errno_ret == EAGAIN) {
+ return NT_STATUS_FILE_LOCK_CONFLICT;
+ } else {
+ return map_nt_error_from_unix(errno);
+ }
+ }
+ }
+
+ /* no conflicts - add it to the list of locks */
+ locks = (struct lock_struct *)SMB_REALLOC(locks, (br_lck->num_locks + 1) * sizeof(*locks));
+ if (!locks) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ memcpy(&locks[br_lck->num_locks], plock, sizeof(struct lock_struct));
+ br_lck->num_locks += 1;
+ br_lck->lock_data = locks;
+ br_lck->modified = True;
+
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Cope with POSIX range splits and merges.
+****************************************************************************/
+
+static unsigned int brlock_posix_split_merge(struct lock_struct *lck_arr, /* Output array. */
+ const struct lock_struct *ex, /* existing lock. */
+ const struct lock_struct *plock, /* proposed lock. */
+ BOOL *lock_was_added)
+{
+ BOOL lock_types_differ = (ex->lock_type != plock->lock_type);
+
+ /* We can't merge non-conflicting locks on different context - ignore fnum. */
+
+ if (!brl_same_context(&ex->context, &plock->context)) {
+ /* Just copy. */
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ return 1;
+ }
+
+ /* We now know we have the same context. */
+
+ /* Did we overlap ? */
+
+/*********************************************
+ +---------+
+ | ex |
+ +---------+
+ +-------+
+ | plock |
+ +-------+
+OR....
+ +---------+
+ | ex |
+ +---------+
+**********************************************/
+
+ if ( (ex->start > (plock->start + plock->size)) ||
+ (plock->start > (ex->start + ex->size))) {
+ /* No overlap with this lock - copy existing. */
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ return 1;
+ }
+
+/*********************************************
+ +---------------------------+
+ | ex |
+ +---------------------------+
+ +---------------------------+
+ | plock | -> replace with plock.
+ +---------------------------+
+**********************************************/
+
+ if ( (ex->start >= plock->start) &&
+ (ex->start + ex->size <= plock->start + plock->size) ) {
+ memcpy(&lck_arr[0], plock, sizeof(struct lock_struct));
+ *lock_was_added = True;
+ return 1;
+ }
+
+/*********************************************
+ +-----------------------+
+ | ex |
+ +-----------------------+
+ +---------------+
+ | plock |
+ +---------------+
+OR....
+ +-------+
+ | ex |
+ +-------+
+ +---------------+
+ | plock |
+ +---------------+
+
+BECOMES....
+ +---------------+-------+
+ | plock | ex | - different lock types.
+ +---------------+-------+
+OR.... (merge)
+ +-----------------------+
+ | ex | - same lock type.
+ +-----------------------+
+**********************************************/
+
+ if ( (ex->start >= plock->start) &&
+ (ex->start <= plock->start + plock->size) &&
+ (ex->start + ex->size > plock->start + plock->size) ) {
+
+ *lock_was_added = True;
+
+ /* If the lock types are the same, we merge, if different, we
+ add the new lock before the old. */
+
+ if (lock_types_differ) {
+ /* Add new. */
+ memcpy(&lck_arr[0], plock, sizeof(struct lock_struct));
+ memcpy(&lck_arr[1], ex, sizeof(struct lock_struct));
+ /* Adjust existing start and size. */
+ lck_arr[1].start = plock->start + plock->size;
+ lck_arr[1].size = (ex->start + ex->size) - (plock->start + plock->size);
+ return 2;
+ } else {
+ /* Merge. */
+ memcpy(&lck_arr[0], plock, sizeof(struct lock_struct));
+ /* Set new start and size. */
+ lck_arr[0].start = plock->start;
+ lck_arr[0].size = (ex->start + ex->size) - plock->start;
+ return 1;
+ }
+ }
+
+/*********************************************
+ +-----------------------+
+ | ex |
+ +-----------------------+
+ +---------------+
+ | plock |
+ +---------------+
+OR....
+ +-------+
+ | ex |
+ +-------+
+ +---------------+
+ | plock |
+ +---------------+
+BECOMES....
+ +-------+---------------+
+ | ex | plock | - different lock types
+ +-------+---------------+
+
+OR.... (merge)
+ +-----------------------+
+ | ex | - same lock type.
+ +-----------------------+
+
+**********************************************/
+
+ if ( (ex->start < plock->start) &&
+ (ex->start + ex->size >= plock->start) &&
+ (ex->start + ex->size <= plock->start + plock->size) ) {
+
+ *lock_was_added = True;
+
+ /* If the lock types are the same, we merge, if different, we
+ add the new lock after the old. */
+
+ if (lock_types_differ) {
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ memcpy(&lck_arr[1], plock, sizeof(struct lock_struct));
+ /* Adjust existing size. */
+ lck_arr[0].size = plock->start - ex->start;
+ return 2;
+ } else {
+ /* Merge. */
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ /* Adjust existing size. */
+ lck_arr[0].size = (plock->start + plock->size) - ex->start;
+ return 1;
+ }
+ }
+
+/*********************************************
+ +---------------------------+
+ | ex |
+ +---------------------------+
+ +---------+
+ | plock |
+ +---------+
+BECOMES.....
+ +-------+---------+---------+
+ | ex | plock | ex | - different lock types.
+ +-------+---------+---------+
+OR
+ +---------------------------+
+ | ex | - same lock type.
+ +---------------------------+
+**********************************************/
+
+ if ( (ex->start < plock->start) && (ex->start + ex->size > plock->start + plock->size) ) {
+ *lock_was_added = True;
+
+ if (lock_types_differ) {
+
+ /* We have to split ex into two locks here. */
+
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ memcpy(&lck_arr[1], plock, sizeof(struct lock_struct));
+ memcpy(&lck_arr[2], ex, sizeof(struct lock_struct));
+
+ /* Adjust first existing size. */
+ lck_arr[0].size = plock->start - ex->start;
+
+ /* Adjust second existing start and size. */
+ lck_arr[2].start = plock->start + plock->size;
+ lck_arr[2].size = (ex->start + ex->size) - (plock->start + plock->size);
+ return 3;
+ } else {
+ /* Just eat plock. */
+ memcpy(&lck_arr[0], ex, sizeof(struct lock_struct));
+ return 1;
+ }
+ }
+
+ /* Never get here. */
+ smb_panic("brlock_posix_split_merge");
+ /* Notreached. */
+
+ /* Keep some compilers happy. */
+ return 0;
+}
+
+/****************************************************************************
+ Lock a range of bytes - POSIX lock semantics.
+ We must cope with range splits and merges.
****************************************************************************/
-BOOL 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)
+static NTSTATUS brl_lock_posix(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck,
+ struct lock_struct *plock)
{
- TDB_DATA kbuf, dbuf;
- int count, i;
- struct lock_struct lock, *locks;
+ unsigned int i, count;
+ struct lock_struct *locks = br_lck->lock_data;
+ struct lock_struct *tp;
+ BOOL lock_was_added = False;
+ BOOL signal_pending_read = False;
+
+ /* No zero-zero locks for POSIX. */
+ if (plock->start == 0 && plock->size == 0) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* Don't allow 64-bit lock wrap. */
+ if (plock->start + plock->size < plock->start ||
+ plock->start + plock->size < plock->size) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* The worst case scenario here is we have to split an
+ existing POSIX lock range into two, and add our lock,
+ so we need at most 2 more entries. */
+
+ tp = SMB_MALLOC_ARRAY(struct lock_struct, (br_lck->num_locks + 2));
+ if (!tp) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ count = 0;
+ for (i=0; i < br_lck->num_locks; i++) {
+ struct lock_struct *curr_lock = &locks[i];
+
+ /* If we have a pending read lock, a lock downgrade should
+ trigger a lock re-evaluation. */
+ if (curr_lock->lock_type == PENDING_READ_LOCK &&
+ brl_pending_overlap(plock, curr_lock)) {
+ signal_pending_read = True;
+ }
+
+ if (curr_lock->lock_flav == WINDOWS_LOCK) {
+ /* Do any Windows flavour locks conflict ? */
+ if (brl_conflict(curr_lock, plock)) {
+ /* No games with error messages. */
+ SAFE_FREE(tp);
+ /* Remember who blocked us. */
+ plock->context.smbpid = curr_lock->context.smbpid;
+ return NT_STATUS_FILE_LOCK_CONFLICT;
+ }
+ /* Just copy the Windows lock into the new array. */
+ memcpy(&tp[count], curr_lock, sizeof(struct lock_struct));
+ count++;
+ } else {
+ /* POSIX conflict semantics are different. */
+ if (brl_conflict_posix(curr_lock, plock)) {
+ /* Can't block ourselves with POSIX locks. */
+ /* No games with error messages. */
+ SAFE_FREE(tp);
+ /* Remember who blocked us. */
+ plock->context.smbpid = curr_lock->context.smbpid;
+ return NT_STATUS_FILE_LOCK_CONFLICT;
+ }
+
+ /* Work out overlaps. */
+ count += brlock_posix_split_merge(&tp[count], curr_lock, plock, &lock_was_added);
+ }
+ }
+
+ if (!lock_was_added) {
+ memcpy(&tp[count], plock, sizeof(struct lock_struct));
+ count++;
+ }
- kbuf = locking_key(dev,ino);
+ /* We can get the POSIX lock, now see if it needs to
+ be mapped into a lower level POSIX one, and if so can
+ we get it ? */
- dbuf.dptr = NULL;
+ if (!IS_PENDING_LOCK(plock->lock_type) && lp_posix_locking(br_lck->fsp->conn->params)) {
+ int errno_ret;
- tdb_lockchain(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
+ /* The lower layer just needs to attempt to
+ get the system POSIX lock. We've weeded out
+ any conflicts above. */
+
+ if (!set_posix_lock_posix_flavour(br_lck->fsp,
+ plock->start,
+ plock->size,
+ plock->lock_type,
+ &errno_ret)) {
+
+ /* We don't know who blocked us. */
+ plock->context.smbpid = 0xFFFFFFFF;
+
+ if (errno_ret == EACCES || errno_ret == EAGAIN) {
+ SAFE_FREE(tp);
+ return NT_STATUS_FILE_LOCK_CONFLICT;
+ } else {
+ SAFE_FREE(tp);
+ return map_nt_error_from_unix(errno);
+ }
+ }
+ }
+
+ /* Realloc so we don't leak entries per lock call. */
+ tp = (struct lock_struct *)SMB_REALLOC(tp, count * sizeof(*locks));
+ if (!tp) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ br_lck->num_locks = count;
+ SAFE_FREE(br_lck->lock_data);
+ br_lck->lock_data = tp;
+ locks = tp;
+ br_lck->modified = True;
+
+ /* A successful downgrade from write to read lock can trigger a lock
+ re-evalutation where waiting readers can now proceed. */
+
+ if (signal_pending_read) {
+ /* Send unlock messages to any pending read waiters that overlap. */
+ for (i=0; i < br_lck->num_locks; i++) {
+ struct lock_struct *pend_lock = &locks[i];
+
+ /* Ignore non-pending locks. */
+ if (!IS_PENDING_LOCK(pend_lock->lock_type)) {
+ continue;
+ }
+
+ if (pend_lock->lock_type == PENDING_READ_LOCK &&
+ brl_pending_overlap(plock, pend_lock)) {
+ DEBUG(10,("brl_lock_posix: sending unlock message to pid %s\n",
+ procid_str_static(&pend_lock->context.pid )));
+
+ messaging_send(msg_ctx, pend_lock->context.pid,
+ MSG_SMB_UNLOCK, &data_blob_null);
+ }
+ }
+ }
+
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Lock a range of bytes.
+****************************************************************************/
+
+NTSTATUS brl_lock(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck,
+ uint32 smbpid,
+ struct server_id pid,
+ br_off start,
+ br_off size,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ BOOL blocking_lock,
+ uint32 *psmbpid)
+{
+ NTSTATUS ret;
+ struct lock_struct lock;
+
+#if !ZERO_ZERO
+ if (start == 0 && size == 0) {
+ DEBUG(0,("client sent 0/0 lock - please report this\n"));
+ }
+#endif
lock.context.smbpid = smbpid;
lock.context.pid = pid;
- lock.context.tid = tid;
+ lock.context.tid = br_lck->fsp->conn->cnum;
lock.start = start;
lock.size = size;
- lock.fnum = fnum;
+ lock.fnum = br_lck->fsp->fnum;
lock.lock_type = lock_type;
+ lock.lock_flav = lock_flav;
- 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)) {
- goto fail;
- }
- }
+ if (lock_flav == WINDOWS_LOCK) {
+ ret = brl_lock_windows(br_lck, &lock, blocking_lock);
+ } else {
+ ret = brl_lock_posix(msg_ctx, br_lck, &lock);
}
- /* no conflicts - add it to the list of locks */
- dbuf.dptr = Realloc(dbuf.dptr, dbuf.dsize + sizeof(*locks));
- if (!dbuf.dptr) goto fail;
- memcpy(dbuf.dptr + dbuf.dsize, &lock, sizeof(lock));
- dbuf.dsize += sizeof(lock);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
-
- free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return True;
+#if ZERO_ZERO
+ /* sort the lock list */
+ qsort(br_lck->lock_data, (size_t)br_lck->num_locks, sizeof(lock), lock_compare);
+#endif
- fail:
- if (dbuf.dptr) free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return False;
+ /* If we're returning an error, return who blocked us. */
+ if (!NT_STATUS_IS_OK(ret) && psmbpid) {
+ *psmbpid = lock.context.smbpid;
+ }
+ return ret;
}
/****************************************************************************
- Unlock a range of bytes.
+ Unlock a range of bytes - Windows semantics.
****************************************************************************/
-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)
+static BOOL brl_unlock_windows(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck,
+ const struct lock_struct *plock)
{
- TDB_DATA kbuf, dbuf;
- int count, i;
- struct lock_struct *locks;
- struct lock_context context;
+ unsigned int i, j;
+ struct lock_struct *locks = br_lck->lock_data;
+ enum brl_type deleted_lock_type = READ_LOCK; /* shut the compiler up.... */
- kbuf = locking_key(dev,ino);
+#if ZERO_ZERO
+ /* Delete write locks by preference... The lock list
+ is sorted in the zero zero case. */
- dbuf.dptr = NULL;
+ for (i = 0; i < br_lck->num_locks; i++) {
+ struct lock_struct *lock = &locks[i];
- tdb_lockchain(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
+ if (lock->lock_type == WRITE_LOCK &&
+ brl_same_context(&lock->context, &plock->context) &&
+ lock->fnum == plock->fnum &&
+ lock->lock_flav == WINDOWS_LOCK &&
+ lock->start == plock->start &&
+ lock->size == plock->size) {
- if (!dbuf.dptr) {
- DEBUG(10,("brl_unlock: tdb_fetch failed !\n"));
- goto fail;
+ /* found it - delete it */
+ deleted_lock_type = lock->lock_type;
+ break;
+ }
}
- 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);
- for (i=0; i<count; i++) {
+ if (i != br_lck->num_locks) {
+ /* We found it - don't search again. */
+ goto unlock_continue;
+ }
+#endif
+ for (i = 0; i < br_lck->num_locks; i++) {
struct lock_struct *lock = &locks[i];
-#if 0
- /* JRATEST - DEBUGGING INFO */
- if(!brl_same_context(&lock->context, &context)) {
- DEBUG(10,("brl_unlock: Not same context. l_smbpid = %u, l_pid = %u, l_tid = %u: \
-smbpid = %u, pid = %u, tid = %u\n",
- lock->context.smbpid, lock->context.pid, lock->context.tid,
- context.smbpid, context.pid, context.tid ));
-
+ /* Only remove our own locks that match in start, size, and flavour. */
+ if (brl_same_context(&lock->context, &plock->context) &&
+ lock->fnum == plock->fnum &&
+ lock->lock_flav == WINDOWS_LOCK &&
+ lock->start == plock->start &&
+ lock->size == plock->size ) {
+ deleted_lock_type = lock->lock_type;
+ break;
}
- /* JRATEST */
+ }
+
+ if (i == br_lck->num_locks) {
+ /* we didn't find it */
+ return False;
+ }
+
+#if ZERO_ZERO
+ unlock_continue:
#endif
- if (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);
+ /* Actually delete the lock. */
+ if (i < br_lck->num_locks - 1) {
+ memmove(&locks[i], &locks[i+1],
+ sizeof(*locks)*((br_lck->num_locks-1) - i));
+ }
+
+ br_lck->num_locks -= 1;
+ br_lck->modified = True;
+
+ /* Unlock the underlying POSIX regions. */
+ if(lp_posix_locking(br_lck->fsp->conn->params)) {
+ release_posix_lock_windows_flavour(br_lck->fsp,
+ plock->start,
+ plock->size,
+ deleted_lock_type,
+ &plock->context,
+ locks,
+ br_lck->num_locks);
+ }
+
+ /* Send unlock messages to any pending waiters that overlap. */
+ for (j=0; j < br_lck->num_locks; j++) {
+ struct lock_struct *pend_lock = &locks[j];
+
+ /* Ignore non-pending locks. */
+ if (!IS_PENDING_LOCK(pend_lock->lock_type)) {
+ continue;
+ }
+
+ /* We could send specific lock info here... */
+ if (brl_pending_overlap(plock, pend_lock)) {
+ DEBUG(10,("brl_unlock: sending unlock message to pid %s\n",
+ procid_str_static(&pend_lock->context.pid )));
+
+ messaging_send(msg_ctx, pend_lock->context.pid,
+ MSG_SMB_UNLOCK, &data_blob_null);
+ }
+ }
+
+ return True;
+}
+
+/****************************************************************************
+ Unlock a range of bytes - POSIX semantics.
+****************************************************************************/
+
+static BOOL brl_unlock_posix(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck,
+ const struct lock_struct *plock)
+{
+ unsigned int i, j, count;
+ struct lock_struct *tp;
+ struct lock_struct *locks = br_lck->lock_data;
+ BOOL overlap_found = False;
+
+ /* No zero-zero locks for POSIX. */
+ if (plock->start == 0 && plock->size == 0) {
+ return False;
+ }
+
+ /* Don't allow 64-bit lock wrap. */
+ if (plock->start + plock->size < plock->start ||
+ plock->start + plock->size < plock->size) {
+ DEBUG(10,("brl_unlock_posix: lock wrap\n"));
+ return False;
+ }
+
+ /* The worst case scenario here is we have to split an
+ existing POSIX lock range into two, so we need at most
+ 1 more entry. */
+
+ tp = SMB_MALLOC_ARRAY(struct lock_struct, (br_lck->num_locks + 1));
+ if (!tp) {
+ DEBUG(10,("brl_unlock_posix: malloc fail\n"));
+ return False;
+ }
+
+ count = 0;
+ for (i = 0; i < br_lck->num_locks; i++) {
+ struct lock_struct *lock = &locks[i];
+ struct lock_struct tmp_lock[3];
+ BOOL lock_was_added = False;
+ unsigned int tmp_count;
+
+ /* Only remove our own locks - ignore fnum. */
+ if (IS_PENDING_LOCK(lock->lock_type) ||
+ !brl_same_context(&lock->context, &plock->context)) {
+ memcpy(&tp[count], lock, sizeof(struct lock_struct));
+ count++;
+ continue;
+ }
+
+ /* Work out overlaps. */
+ tmp_count = brlock_posix_split_merge(&tmp_lock[0], &locks[i], plock, &lock_was_added);
+
+ if (tmp_count == 1) {
+ /* Ether the locks didn't overlap, or the unlock completely
+ overlapped this lock. If it didn't overlap, then there's
+ no change in the locks. */
+ if (tmp_lock[0].lock_type != UNLOCK_LOCK) {
+ SMB_ASSERT(tmp_lock[0].lock_type == locks[i].lock_type);
+ /* No change in this lock. */
+ memcpy(&tp[count], &tmp_lock[0], sizeof(struct lock_struct));
+ count++;
} else {
- if (i < count-1) {
- memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
+ SMB_ASSERT(tmp_lock[0].lock_type == UNLOCK_LOCK);
+ overlap_found = True;
+ }
+ continue;
+ } else if (tmp_count == 2) {
+ /* The unlock overlapped an existing lock. Copy the truncated
+ lock into the lock array. */
+ if (tmp_lock[0].lock_type != UNLOCK_LOCK) {
+ SMB_ASSERT(tmp_lock[0].lock_type == locks[i].lock_type);
+ SMB_ASSERT(tmp_lock[1].lock_type == UNLOCK_LOCK);
+ memcpy(&tp[count], &tmp_lock[0], sizeof(struct lock_struct));
+ if (tmp_lock[0].size != locks[i].size) {
+ overlap_found = True;
}
- dbuf.dsize -= sizeof(*locks);
- tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
+ } else {
+ SMB_ASSERT(tmp_lock[0].lock_type == UNLOCK_LOCK);
+ SMB_ASSERT(tmp_lock[1].lock_type == locks[i].lock_type);
+ memcpy(&tp[count], &tmp_lock[1], sizeof(struct lock_struct));
+ if (tmp_lock[1].start != locks[i].start) {
+ overlap_found = True;
+ }
+ }
+ count++;
+ continue;
+ } else {
+ /* tmp_count == 3 - (we split a lock range in two). */
+ SMB_ASSERT(tmp_lock[0].lock_type == locks[i].lock_type);
+ SMB_ASSERT(tmp_lock[1].lock_type == UNLOCK_LOCK);
+ SMB_ASSERT(tmp_lock[2].lock_type == locks[i].lock_type);
+
+ memcpy(&tp[count], &tmp_lock[0], sizeof(struct lock_struct));
+ count++;
+ memcpy(&tp[count], &tmp_lock[2], sizeof(struct lock_struct));
+ count++;
+ overlap_found = True;
+ /* Optimisation... */
+ /* We know we're finished here as we can't overlap any
+ more POSIX locks. Copy the rest of the lock array. */
+ if (i < br_lck->num_locks - 1) {
+ memcpy(&tp[count], &locks[i+1],
+ sizeof(*locks)*((br_lck->num_locks-1) - i));
+ count += ((br_lck->num_locks-1) - i);
}
+ break;
+ }
+ }
+
+ if (!overlap_found) {
+ /* Just ignore - no change. */
+ SAFE_FREE(tp);
+ DEBUG(10,("brl_unlock_posix: No overlap - unlocked.\n"));
+ return True;
+ }
+
+ /* Unlock any POSIX regions. */
+ if(lp_posix_locking(br_lck->fsp->conn->params)) {
+ release_posix_lock_posix_flavour(br_lck->fsp,
+ plock->start,
+ plock->size,
+ &plock->context,
+ tp,
+ count);
+ }
- free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return True;
+ /* Realloc so we don't leak entries per unlock call. */
+ if (count) {
+ tp = (struct lock_struct *)SMB_REALLOC(tp, count * sizeof(*locks));
+ if (!tp) {
+ DEBUG(10,("brl_unlock_posix: realloc fail\n"));
+ return False;
}
+ } else {
+ /* We deleted the last lock. */
+ SAFE_FREE(tp);
+ tp = NULL;
}
- /* we didn't find it */
+ br_lck->num_locks = count;
+ SAFE_FREE(br_lck->lock_data);
+ locks = tp;
+ br_lck->lock_data = tp;
+ br_lck->modified = True;
- fail:
- if (dbuf.dptr) free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return False;
+ /* Send unlock messages to any pending waiters that overlap. */
+
+ for (j=0; j < br_lck->num_locks; j++) {
+ struct lock_struct *pend_lock = &locks[j];
+
+ /* Ignore non-pending locks. */
+ if (!IS_PENDING_LOCK(pend_lock->lock_type)) {
+ continue;
+ }
+
+ /* We could send specific lock info here... */
+ if (brl_pending_overlap(plock, pend_lock)) {
+ DEBUG(10,("brl_unlock: sending unlock message to pid %s\n",
+ procid_str_static(&pend_lock->context.pid )));
+
+ messaging_send(msg_ctx, pend_lock->context.pid,
+ MSG_SMB_UNLOCK, &data_blob_null);
+ }
+ }
+
+ return True;
}
/****************************************************************************
- Test if we could add a lock if we wanted to.
+ Unlock a range of bytes.
****************************************************************************/
-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)
+BOOL brl_unlock(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck,
+ uint32 smbpid,
+ struct server_id pid,
+ br_off start,
+ br_off size,
+ enum brl_flavour lock_flav)
{
- TDB_DATA kbuf, dbuf;
- int count, i;
- struct lock_struct lock, *locks;
+ struct lock_struct lock;
- kbuf = locking_key(dev,ino);
+ lock.context.smbpid = smbpid;
+ lock.context.pid = pid;
+ lock.context.tid = br_lck->fsp->conn->cnum;
+ lock.start = start;
+ lock.size = size;
+ lock.fnum = br_lck->fsp->fnum;
+ lock.lock_type = UNLOCK_LOCK;
+ lock.lock_flav = lock_flav;
+
+ if (lock_flav == WINDOWS_LOCK) {
+ return brl_unlock_windows(msg_ctx, br_lck, &lock);
+ } else {
+ return brl_unlock_posix(msg_ctx, br_lck, &lock);
+ }
+}
- dbuf.dptr = NULL;
+/****************************************************************************
+ Test if we could add a lock if we wanted to.
+ Returns True if the region required is currently unlocked, False if locked.
+****************************************************************************/
- tdb_lockchain(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
+BOOL brl_locktest(struct byte_range_lock *br_lck,
+ uint32 smbpid,
+ struct server_id pid,
+ br_off start,
+ br_off size,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav)
+{
+ BOOL ret = True;
+ unsigned int i;
+ struct lock_struct lock;
+ const struct lock_struct *locks = br_lck->lock_data;
+ files_struct *fsp = br_lck->fsp;
lock.context.smbpid = smbpid;
lock.context.pid = pid;
- lock.context.tid = tid;
+ lock.context.tid = br_lck->fsp->conn->cnum;
lock.start = start;
lock.size = size;
- lock.fnum = fnum;
+ lock.fnum = fsp->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)) {
- goto fail;
- }
+ lock.lock_flav = lock_flav;
+
+ /* Make sure existing locks don't conflict */
+ for (i=0; i < br_lck->num_locks; i++) {
+ /*
+ * Our own locks don't conflict.
+ */
+ if (brl_conflict_other(&locks[i], &lock)) {
+ return False;
}
}
+ /*
+ * There is no lock held by an SMB daemon, check to
+ * see if there is a POSIX lock from a UNIX or NFS process.
+ * This only conflicts with Windows locks, not POSIX locks.
+ */
+
+ if(lp_posix_locking(fsp->conn->params) && (lock_flav == WINDOWS_LOCK)) {
+ ret = is_posix_locked(fsp, &start, &size, &lock_type, WINDOWS_LOCK);
+
+ DEBUG(10,("brl_locktest: posix start=%.0f len=%.0f %s for fnum %d file %s\n",
+ (double)start, (double)size, ret ? "locked" : "unlocked",
+ fsp->fnum, fsp->fsp_name ));
+
+ /* We need to return the inverse of is_posix_locked. */
+ ret = !ret;
+ }
+
/* no conflicts - we could have added it */
- free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return True;
+ return ret;
+}
- fail:
- if (dbuf.dptr) free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
- return False;
+/****************************************************************************
+ Query for existing locks.
+****************************************************************************/
+
+NTSTATUS brl_lockquery(struct byte_range_lock *br_lck,
+ uint32 *psmbpid,
+ struct server_id pid,
+ br_off *pstart,
+ br_off *psize,
+ enum brl_type *plock_type,
+ enum brl_flavour lock_flav)
+{
+ unsigned int i;
+ struct lock_struct lock;
+ const struct lock_struct *locks = br_lck->lock_data;
+ files_struct *fsp = br_lck->fsp;
+
+ lock.context.smbpid = *psmbpid;
+ lock.context.pid = pid;
+ lock.context.tid = br_lck->fsp->conn->cnum;
+ lock.start = *pstart;
+ lock.size = *psize;
+ lock.fnum = fsp->fnum;
+ lock.lock_type = *plock_type;
+ lock.lock_flav = lock_flav;
+
+ /* Make sure existing locks don't conflict */
+ for (i=0; i < br_lck->num_locks; i++) {
+ const struct lock_struct *exlock = &locks[i];
+ BOOL conflict = False;
+
+ if (exlock->lock_flav == WINDOWS_LOCK) {
+ conflict = brl_conflict(exlock, &lock);
+ } else {
+ conflict = brl_conflict_posix(exlock, &lock);
+ }
+
+ if (conflict) {
+ *psmbpid = exlock->context.smbpid;
+ *pstart = exlock->start;
+ *psize = exlock->size;
+ *plock_type = exlock->lock_type;
+ return NT_STATUS_LOCK_NOT_GRANTED;
+ }
+ }
+
+ /*
+ * 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(lp_posix_locking(fsp->conn->params)) {
+ BOOL ret = is_posix_locked(fsp, pstart, psize, plock_type, POSIX_LOCK);
+
+ DEBUG(10,("brl_lockquery: posix start=%.0f len=%.0f %s for fnum %d file %s\n",
+ (double)*pstart, (double)*psize, ret ? "locked" : "unlocked",
+ fsp->fnum, fsp->fsp_name ));
+
+ if (ret) {
+ /* Hmmm. No clue what to set smbpid to - use -1. */
+ *psmbpid = 0xFFFF;
+ return NT_STATUS_LOCK_NOT_GRANTED;
+ }
+ }
+
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ Remove a particular pending lock.
+****************************************************************************/
+
+BOOL brl_lock_cancel(struct byte_range_lock *br_lck,
+ uint32 smbpid,
+ struct server_id pid,
+ br_off start,
+ br_off size,
+ enum brl_flavour lock_flav)
+{
+ unsigned int i;
+ struct lock_struct *locks = br_lck->lock_data;
+ struct lock_context context;
+
+ context.smbpid = smbpid;
+ context.pid = pid;
+ context.tid = br_lck->fsp->conn->cnum;
+
+ for (i = 0; i < br_lck->num_locks; i++) {
+ struct lock_struct *lock = &locks[i];
+
+ /* For pending locks we *always* care about the fnum. */
+ if (brl_same_context(&lock->context, &context) &&
+ lock->fnum == br_lck->fsp->fnum &&
+ IS_PENDING_LOCK(lock->lock_type) &&
+ lock->lock_flav == lock_flav &&
+ lock->start == start &&
+ lock->size == size) {
+ break;
+ }
+ }
+
+ if (i == br_lck->num_locks) {
+ /* Didn't find it. */
+ return False;
+ }
+
+ if (i < br_lck->num_locks - 1) {
+ /* Found this particular pending lock - delete it */
+ memmove(&locks[i], &locks[i+1],
+ sizeof(*locks)*((br_lck->num_locks-1) - i));
+ }
+
+ br_lck->num_locks -= 1;
+ br_lck->modified = True;
+ return True;
}
/****************************************************************************
Remove any locks associated with a open file.
+ We return True if this process owns any other Windows locks on this
+ fd and so we should not immediately close the fd.
****************************************************************************/
-void brl_close(SMB_DEV_T dev, SMB_INO_T ino, pid_t pid, int tid, int fnum)
+void brl_close_fnum(struct messaging_context *msg_ctx,
+ struct byte_range_lock *br_lck)
{
- TDB_DATA kbuf, dbuf;
- int count, i, dcount=0;
- struct lock_struct *locks;
+ files_struct *fsp = br_lck->fsp;
+ uint16 tid = fsp->conn->cnum;
+ int fnum = fsp->fnum;
+ unsigned int i, j, dcount=0;
+ int num_deleted_windows_locks = 0;
+ struct lock_struct *locks = br_lck->lock_data;
+ struct server_id pid = procid_self();
+ BOOL unlock_individually = False;
+
+ if(lp_posix_locking(fsp->conn->params)) {
+
+ /* Check if there are any Windows locks associated with this dev/ino
+ pair that are not this fnum. If so we need to call unlock on each
+ one in order to release the system POSIX locks correctly. */
+
+ for (i=0; i < br_lck->num_locks; i++) {
+ struct lock_struct *lock = &locks[i];
+
+ if (!procid_equal(&lock->context.pid, &pid)) {
+ continue;
+ }
+
+ if (lock->lock_type != READ_LOCK && lock->lock_type != WRITE_LOCK) {
+ continue; /* Ignore pending. */
+ }
- kbuf = locking_key(dev,ino);
+ if (lock->context.tid != tid || lock->fnum != fnum) {
+ unlock_individually = True;
+ break;
+ }
+ }
- dbuf.dptr = NULL;
+ if (unlock_individually) {
+ struct lock_struct *locks_copy;
+ unsigned int num_locks_copy;
+
+ /* Copy the current lock array. */
+ if (br_lck->num_locks) {
+ locks_copy = (struct lock_struct *)TALLOC_MEMDUP(br_lck, locks, br_lck->num_locks * sizeof(struct lock_struct));
+ if (!locks_copy) {
+ smb_panic("brl_close_fnum: talloc failed");
+ }
+ } else {
+ locks_copy = NULL;
+ }
- tdb_lockchain(tdb, kbuf);
- dbuf = tdb_fetch(tdb, kbuf);
+ num_locks_copy = br_lck->num_locks;
- if (!dbuf.dptr) goto fail;
+ for (i=0; i < num_locks_copy; i++) {
+ struct lock_struct *lock = &locks_copy[i];
- /* 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++) {
+ if (lock->context.tid == tid && procid_equal(&lock->context.pid, &pid) &&
+ (lock->fnum == fnum)) {
+ brl_unlock(msg_ctx,
+ br_lck,
+ lock->context.smbpid,
+ pid,
+ lock->start,
+ lock->size,
+ lock->lock_flav);
+ }
+ }
+ return;
+ }
+ }
+
+ /* We can bulk delete - any POSIX locks will be removed when the fd closes. */
+
+ /* Remove any existing locks for this fnum (or any fnum if they're POSIX). */
+
+ for (i=0; i < br_lck->num_locks; i++) {
struct lock_struct *lock = &locks[i];
+ BOOL del_this_lock = False;
+
+ if (lock->context.tid == tid && procid_equal(&lock->context.pid, &pid)) {
+ if ((lock->lock_flav == WINDOWS_LOCK) && (lock->fnum == fnum)) {
+ del_this_lock = True;
+ num_deleted_windows_locks++;
+ } else if (lock->lock_flav == POSIX_LOCK) {
+ del_this_lock = True;
+ }
+ }
+
+ if (del_this_lock) {
+ /* Send unlock messages to any pending waiters that overlap. */
+ for (j=0; j < br_lck->num_locks; j++) {
+ struct lock_struct *pend_lock = &locks[j];
+
+ /* Ignore our own or non-pending locks. */
+ if (!IS_PENDING_LOCK(pend_lock->lock_type)) {
+ continue;
+ }
+
+ /* Optimisation - don't send to this fnum as we're
+ closing it. */
+ if (pend_lock->context.tid == tid &&
+ procid_equal(&pend_lock->context.pid, &pid) &&
+ pend_lock->fnum == fnum) {
+ continue;
+ }
+
+ /* We could send specific lock info here... */
+ if (brl_pending_overlap(lock, pend_lock)) {
+ messaging_send(msg_ctx, pend_lock->context.pid,
+ MSG_SMB_UNLOCK, &data_blob_null);
+ }
+ }
- if (lock->context.tid == tid &&
- lock->context.pid == pid &&
- lock->fnum == fnum) {
/* found it - delete it */
- if (count > 1 && i < count-1) {
+ if (br_lck->num_locks > 1 && i < br_lck->num_locks - 1) {
memmove(&locks[i], &locks[i+1],
- sizeof(*locks)*((count-1) - i));
+ sizeof(*locks)*((br_lck->num_locks-1) - i));
}
- count--;
+ br_lck->num_locks--;
+ br_lck->modified = True;
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);
+ if(lp_posix_locking(fsp->conn->params) && num_deleted_windows_locks) {
+ /* Reduce the Windows lock POSIX reference count on this dev/ino pair. */
+ reduce_windows_lock_ref_count(fsp, num_deleted_windows_locks);
+ }
+}
+
+/****************************************************************************
+ Ensure this set of lock entries is valid.
+****************************************************************************/
+
+static BOOL validate_lock_entries(unsigned int *pnum_entries, struct lock_struct **pplocks)
+{
+ unsigned int i;
+ unsigned int num_valid_entries = 0;
+ struct lock_struct *locks = *pplocks;
+
+ for (i = 0; i < *pnum_entries; i++) {
+ struct lock_struct *lock_data = &locks[i];
+ if (!process_exists(lock_data->context.pid)) {
+ /* This process no longer exists - mark this
+ entry as invalid by zeroing it. */
+ ZERO_STRUCTP(lock_data);
+ } else {
+ num_valid_entries++;
+ }
+ }
+
+ if (num_valid_entries != *pnum_entries) {
+ struct lock_struct *new_lock_data = NULL;
+
+ if (num_valid_entries) {
+ new_lock_data = SMB_MALLOC_ARRAY(struct lock_struct, num_valid_entries);
+ if (!new_lock_data) {
+ DEBUG(3, ("malloc fail\n"));
+ return False;
+ }
+
+ num_valid_entries = 0;
+ for (i = 0; i < *pnum_entries; i++) {
+ struct lock_struct *lock_data = &locks[i];
+ if (lock_data->context.smbpid &&
+ lock_data->context.tid) {
+ /* Valid (nonzero) entry - copy it. */
+ memcpy(&new_lock_data[num_valid_entries],
+ lock_data, sizeof(struct lock_struct));
+ num_valid_entries++;
+ }
+ }
+ }
+
+ SAFE_FREE(*pplocks);
+ *pplocks = new_lock_data;
+ *pnum_entries = num_valid_entries;
}
- /* we didn't find it */
- fail:
- if (dbuf.dptr) free(dbuf.dptr);
- tdb_unlockchain(tdb, kbuf);
+ return True;
}
+struct brl_forall_cb {
+ void (*fn)(struct file_id id, struct server_id pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ br_off start, br_off size,
+ void *private_data);
+ void *private_data;
+};
+
/****************************************************************************
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)
+static int traverse_fn(struct db_record *rec, void *state)
{
+ struct brl_forall_cb *cb = (struct brl_forall_cb *)state;
struct lock_struct *locks;
- struct lock_key *key;
- int i;
+ struct file_id *key;
+ unsigned int i;
+ unsigned int num_locks = 0;
+ unsigned int orig_num_locks = 0;
+
+ /* In a traverse function we must make a copy of
+ dbuf before modifying it. */
+
+ locks = (struct lock_struct *)memdup(rec->value.dptr,
+ rec->value.dsize);
+ if (!locks) {
+ return -1; /* Terminate traversal. */
+ }
+
+ key = (struct file_id *)rec->key.dptr;
+ orig_num_locks = num_locks = rec->value.dsize/sizeof(*locks);
- BRLOCK_FN(traverse_callback) = (BRLOCK_FN_CAST())state;
+ /* Ensure the lock db is clean of entries from invalid processes. */
+
+ if (!validate_lock_entries(&num_locks, &locks)) {
+ SAFE_FREE(locks);
+ return -1; /* Terminate traversal */
+ }
- locks = (struct lock_struct *)dbuf.dptr;
- key = (struct lock_key *)kbuf.dptr;
+ if (orig_num_locks != num_locks) {
+ if (num_locks) {
+ TDB_DATA data;
+ data.dptr = (uint8_t *)locks;
+ data.dsize = num_locks*sizeof(struct lock_struct);
+ rec->store(rec, data, TDB_REPLACE);
+ } else {
+ rec->delete_rec(rec);
+ }
+ }
- 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);
+ for ( i=0; i<num_locks; i++) {
+ cb->fn(*key,
+ locks[i].context.pid,
+ locks[i].lock_type,
+ locks[i].lock_flav,
+ locks[i].start,
+ locks[i].size,
+ cb->private_data);
}
+
+ SAFE_FREE(locks);
return 0;
}
Call the specified function on each lock in the database.
********************************************************************/
-int brl_forall(BRLOCK_FN(fn))
+int brl_forall(void (*fn)(struct file_id id, struct server_id pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ br_off start, br_off size,
+ void *private_data),
+ void *private_data)
+{
+ struct brl_forall_cb cb;
+
+ if (!brlock_db) {
+ return 0;
+ }
+ cb.fn = fn;
+ cb.private_data = private_data;
+ return brlock_db->traverse(brlock_db, traverse_fn, &cb);
+}
+
+/*******************************************************************
+ Store a potentially modified set of byte range lock data back into
+ the database.
+ Unlock the record.
+********************************************************************/
+
+static int byte_range_lock_destructor(struct byte_range_lock *br_lck)
+{
+ TDB_DATA key;
+
+ key.dptr = (uint8 *)&br_lck->key;
+ key.dsize = sizeof(struct file_id);
+
+ if (br_lck->read_only) {
+ SMB_ASSERT(!br_lck->modified);
+ }
+
+ if (!br_lck->modified) {
+ goto done;
+ }
+
+ if (br_lck->num_locks == 0) {
+ /* No locks - delete this entry. */
+ NTSTATUS status = br_lck->record->delete_rec(br_lck->record);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("delete_rec returned %s\n",
+ nt_errstr(status)));
+ smb_panic("Could not delete byte range lock entry");
+ }
+ } else {
+ TDB_DATA data;
+ NTSTATUS status;
+
+ data.dptr = (uint8 *)br_lck->lock_data;
+ data.dsize = br_lck->num_locks * sizeof(struct lock_struct);
+
+ status = br_lck->record->store(br_lck->record, data,
+ TDB_REPLACE);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("store returned %s\n", nt_errstr(status)));
+ smb_panic("Could not store byte range mode entry");
+ }
+ }
+
+ done:
+
+ SAFE_FREE(br_lck->lock_data);
+ TALLOC_FREE(br_lck->record);
+ return 0;
+}
+
+/*******************************************************************
+ Fetch a set of byte range lock data from the database.
+ Leave the record locked.
+ TALLOC_FREE(brl) will release the lock in the destructor.
+********************************************************************/
+
+static struct byte_range_lock *brl_get_locks_internal(TALLOC_CTX *mem_ctx,
+ files_struct *fsp, BOOL read_only)
+{
+ TDB_DATA key, data;
+ struct byte_range_lock *br_lck = TALLOC_P(mem_ctx, struct byte_range_lock);
+
+ if (br_lck == NULL) {
+ return NULL;
+ }
+
+ br_lck->fsp = fsp;
+ br_lck->num_locks = 0;
+ br_lck->modified = False;
+ memset(&br_lck->key, '\0', sizeof(struct file_id));
+ br_lck->key = fsp->file_id;
+
+ key.dptr = (uint8 *)&br_lck->key;
+ key.dsize = sizeof(struct file_id);
+
+ if (!fsp->lockdb_clean) {
+ /* We must be read/write to clean
+ the dead entries. */
+ read_only = False;
+ }
+
+ if (read_only) {
+ if (brlock_db->fetch(brlock_db, br_lck, key, &data) == -1) {
+ DEBUG(3, ("Could not fetch byte range lock record\n"));
+ TALLOC_FREE(br_lck);
+ return NULL;
+ }
+ br_lck->record = NULL;
+ }
+ else {
+ br_lck->record = brlock_db->fetch_locked(brlock_db, br_lck, key);
+
+ if (br_lck->record == NULL) {
+ DEBUG(3, ("Could not lock byte range lock entry\n"));
+ TALLOC_FREE(br_lck);
+ return NULL;
+ }
+
+ data = br_lck->record->value;
+ }
+
+ br_lck->read_only = read_only;
+
+ talloc_set_destructor(br_lck, byte_range_lock_destructor);
+
+ br_lck->num_locks = data.dsize / sizeof(struct lock_struct);
+ if (!(br_lck->lock_data = SMB_MALLOC_ARRAY(
+ struct lock_struct, br_lck->num_locks))) {
+ DEBUG(0, ("malloc failed\n"));
+ TALLOC_FREE(br_lck);
+ return NULL;
+ }
+
+ memcpy(br_lck->lock_data, data.dptr, data.dsize);
+
+ if (!fsp->lockdb_clean) {
+ int orig_num_locks = br_lck->num_locks;
+
+ /* This is the first time we've accessed this. */
+ /* Go through and ensure all entries exist - remove any that don't. */
+ /* Makes the lockdb self cleaning at low cost. */
+
+ if (!validate_lock_entries(&br_lck->num_locks,
+ &br_lck->lock_data)) {
+ SAFE_FREE(br_lck->lock_data);
+ TALLOC_FREE(br_lck);
+ return NULL;
+ }
+
+ /* Ensure invalid locks are cleaned up in the destructor. */
+ if (orig_num_locks != br_lck->num_locks) {
+ br_lck->modified = True;
+ }
+
+ /* Mark the lockdb as "clean" as seen from this open file. */
+ fsp->lockdb_clean = True;
+ }
+
+ if (DEBUGLEVEL >= 10) {
+ unsigned int i;
+ struct lock_struct *locks = br_lck->lock_data;
+ DEBUG(10,("brl_get_locks_internal: %u current locks on file_id %s\n",
+ br_lck->num_locks,
+ file_id_static_string(&fsp->file_id)));
+ for( i = 0; i < br_lck->num_locks; i++) {
+ print_lock_struct(i, &locks[i]);
+ }
+ }
+ return br_lck;
+}
+
+struct byte_range_lock *brl_get_locks(TALLOC_CTX *mem_ctx,
+ files_struct *fsp)
+{
+ return brl_get_locks_internal(mem_ctx, fsp, False);
+}
+
+struct byte_range_lock *brl_get_locks_readonly(TALLOC_CTX *mem_ctx,
+ files_struct *fsp)
+{
+ return brl_get_locks_internal(mem_ctx, fsp, True);
+}
+
+struct brl_revalidate_state {
+ ssize_t array_size;
+ uint32 num_pids;
+ struct server_id *pids;
+};
+
+/*
+ * Collect PIDs of all processes with pending entries
+ */
+
+static void brl_revalidate_collect(struct file_id id, struct server_id pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ br_off start, br_off size,
+ void *private_data)
+{
+ struct brl_revalidate_state *state =
+ (struct brl_revalidate_state *)private_data;
+
+ if (!IS_PENDING_LOCK(lock_type)) {
+ return;
+ }
+
+ add_to_large_array(state, sizeof(pid), (void *)&pid,
+ &state->pids, &state->num_pids,
+ &state->array_size);
+}
+
+/*
+ * qsort callback to sort the processes
+ */
+
+static int compare_procids(const void *p1, const void *p2)
+{
+ const struct server_id *i1 = (struct server_id *)p1;
+ const struct server_id *i2 = (struct server_id *)p2;
+
+ if (i1->pid < i2->pid) return -1;
+ if (i2->pid > i2->pid) return 1;
+ return 0;
+}
+
+/*
+ * Send a MSG_SMB_UNLOCK message to all processes with pending byte range
+ * locks so that they retry. Mainly used in the cluster code after a node has
+ * died.
+ *
+ * Done in two steps to avoid double-sends: First we collect all entries in an
+ * array, then qsort that array and only send to non-dupes.
+ */
+
+static void brl_revalidate(struct messaging_context *msg_ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+ struct brl_revalidate_state *state;
+ uint32 i;
+ struct server_id last_pid;
+
+ if (!(state = TALLOC_ZERO_P(NULL, struct brl_revalidate_state))) {
+ DEBUG(0, ("talloc failed\n"));
+ return;
+ }
+
+ brl_forall(brl_revalidate_collect, state);
+
+ if (state->array_size == -1) {
+ DEBUG(0, ("talloc failed\n"));
+ goto done;
+ }
+
+ if (state->num_pids == 0) {
+ goto done;
+ }
+
+ qsort(state->pids, state->num_pids, sizeof(state->pids[0]),
+ compare_procids);
+
+ ZERO_STRUCT(last_pid);
+
+ for (i=0; i<state->num_pids; i++) {
+ if (procid_equal(&last_pid, &state->pids[i])) {
+ /*
+ * We've seen that one already
+ */
+ continue;
+ }
+
+ messaging_send(msg_ctx, state->pids[i], MSG_SMB_UNLOCK,
+ &data_blob_null);
+ last_pid = state->pids[i];
+ }
+
+ done:
+ TALLOC_FREE(state);
+ return;
+}
+
+void brl_register_msgs(struct messaging_context *msg_ctx)
{
- if (!tdb) return 0;
- return tdb_traverse(tdb, traverse_fn, (BRLOCK_FN_CAST())fn);
+ messaging_register(msg_ctx, NULL, MSG_SMB_BRL_VALIDATE,
+ brl_revalidate);
}
git.samba.org / jra / samba / .git / blobdiff