diff options
Diffstat (limited to 'source3/locking')
| -rw-r--r-- | source3/locking/locking.c | 1458 | ||||
| -rw-r--r-- | source3/locking/locking_shm.c | 739 | ||||
| -rw-r--r-- | source3/locking/locking_slow.c | 1039 |
3 files changed, 1829 insertions, 1407 deletions
diff --git a/source3/locking/locking.c b/source3/locking/locking.c index bbc0c0033f..c75497c6b9 100644 --- a/source3/locking/locking.c +++ b/source3/locking/locking.c @@ -36,6 +36,8 @@ extern int DEBUGLEVEL; extern connection_struct Connections[]; extern files_struct Files[]; +static struct share_ops *share_ops; + /**************************************************************************** utility function called to see if a file region is locked ****************************************************************************/ @@ -104,1460 +106,102 @@ BOOL do_unlock(int fnum,int cnum,uint32 count,uint32 offset,int *eclass,uint32 * return True; /* Did unlock */ } -#ifdef FAST_SHARE_MODES -/******************************************************************* - initialize the shared memory for share_mode management - ******************************************************************/ -BOOL start_share_mode_mgmt(void) -{ - pstring shmem_file_name; - - pstrcpy(shmem_file_name,lp_lockdir()); - if (!directory_exist(shmem_file_name,NULL)) - mkdir(shmem_file_name,0755); - trim_string(shmem_file_name,"","/"); - if (!*shmem_file_name) return(False); - strcat(shmem_file_name, "/SHARE_MEM_FILE"); - return smb_shm_open(shmem_file_name, lp_shmem_size()); -} -/******************************************************************* - deinitialize the shared memory for share_mode management - ******************************************************************/ -BOOL stop_share_mode_mgmt(void) +/**************************************************************************** + initialise the locking functions +****************************************************************************/ +BOOL locking_init(void) { - return smb_shm_close(); -} +#ifdef FAST_SHARE_MODES + share_ops = locking_shm_init(); + if (!share_ops) { + DEBUG(0,("ERROR: Failed to initialise fast share modes - trying slow code\n")); + } + if (share_ops) return True; +#endif -/******************************************************************* - lock a hash bucket entry in shared memory for share_mode management - ******************************************************************/ -BOOL lock_share_entry(int cnum, uint32 dev, uint32 inode, share_lock_token *ptok) -{ - return smb_shm_lock_hash_entry(HASH_ENTRY(dev, inode)); + share_ops = locking_slow_init(); + if (!share_ops) { + DEBUG(0,("ERROR: Failed to initialise share modes!\n")); + return False; + } + + return True; } /******************************************************************* - unlock a hash bucket entry in shared memory for share_mode management + deinitialize the share_mode management ******************************************************************/ -BOOL unlock_share_entry(int cnum, uint32 dev, uint32 inode, share_lock_token token) +BOOL locking_end(void) { - return smb_shm_unlock_hash_entry(HASH_ENTRY(dev, inode)); + return share_ops->stop_mgmt(); } -/******************************************************************* -get all share mode entries in shared memory for a dev/inode pair. -********************************************************************/ -int get_share_modes(int cnum, share_lock_token token, uint32 dev, uint32 inode, - min_share_mode_entry **old_shares) -{ - smb_shm_offset_t *mode_array; - unsigned int hash_entry = HASH_ENTRY(dev, inode); - share_mode_record *file_scanner_p; - share_mode_record *file_prev_p; - share_mode_entry *entry_scanner_p; - share_mode_entry *entry_prev_p; - int num_entries; - int num_entries_copied; - BOOL found = False; - min_share_mode_entry *share_array = (min_share_mode_entry *)0; - - *old_shares = 0; - - if(hash_entry > lp_shmem_hash_size() ) - { - DEBUG(0, - ("PANIC ERROR : get_share_modes (FAST_SHARE_MODES): hash_entry %d too large \ -(max = %d)\n", - hash_entry, lp_shmem_hash_size() )); - return 0; - } - - mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); - - if(mode_array[hash_entry] == NULL_OFFSET) - { - DEBUG(5,("get_share_modes (FAST_SHARE_MODES): hash bucket %d empty\n", hash_entry)); - return 0; - } - - file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); - file_prev_p = file_scanner_p; - while(file_scanner_p) - { - if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) - { - found = True; - break; - } - else - { - file_prev_p = file_scanner_p ; - file_scanner_p = (share_mode_record *)smb_shm_offset2addr( - file_scanner_p->next_offset); - } - } - - if(!found) - { - DEBUG(5,("get_share_modes (FAST_SHARE_MODES): no entry for \ -file dev = %d, ino = %d in hash_bucket %d\n", dev, inode, hash_entry)); - return (0); - } - - if(file_scanner_p->locking_version != LOCKING_VERSION) - { - DEBUG(0,("ERROR:get_share_modes (FAST_SHARE_MODES): Deleting old share mode \ -record due to old locking version %d for file dev = %d, inode = %d in hash \ -bucket %d\n", file_scanner_p->locking_version, dev, inode, hash_entry)); - if(file_prev_p == file_scanner_p) - mode_array[hash_entry] = file_scanner_p->next_offset; - else - file_prev_p->next_offset = file_scanner_p->next_offset; - smb_shm_free(smb_shm_addr2offset(file_scanner_p)); - return (0); - } - - /* Allocate the old_shares array */ - num_entries = file_scanner_p->num_share_mode_entries; - if(num_entries) - { - *old_shares = share_array = (min_share_mode_entry *) - malloc(num_entries * sizeof(min_share_mode_entry)); - if(*old_shares == 0) - { - DEBUG(0,("get_share_modes (FAST_SHARE_MODES): malloc fail !\n")); - return 0; - } - } - - num_entries_copied = 0; - - entry_scanner_p = (share_mode_entry*)smb_shm_offset2addr( - file_scanner_p->share_mode_entries); - entry_prev_p = entry_scanner_p; - while(entry_scanner_p) - { - int pid = entry_scanner_p->pid; - - if (pid && !process_exists(pid)) - { - /* Delete this share mode entry */ - share_mode_entry *delete_entry_p = entry_scanner_p; - int share_mode = entry_scanner_p->share_mode; - - if(entry_prev_p == entry_scanner_p) - { - /* We are at start of list */ - file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry; - entry_scanner_p = (share_mode_entry*)smb_shm_offset2addr( - file_scanner_p->share_mode_entries); - entry_prev_p = entry_scanner_p; - } - else - { - entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry; - entry_scanner_p = (share_mode_entry*) - smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); - } - /* Decrement the number of share mode entries on this share mode record */ - file_scanner_p->num_share_mode_entries -= 1; - - /* PARANOIA TEST */ - if(file_scanner_p->num_share_mode_entries < 0) - { - DEBUG(0,("PANIC ERROR:get_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ -for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, - dev, inode, hash_entry)); - return 0; - } - - DEBUG(0,("get_share_modes (FAST_SHARE_MODES): process %d no longer exists and \ -it left a share mode entry with mode 0x%X for file dev = %d, ino = %d in hash \ -bucket %d (number of entries now = %d)\n", - pid, share_mode, dev, inode, hash_entry, - file_scanner_p->num_share_mode_entries)); - - smb_shm_free(smb_shm_addr2offset(delete_entry_p)); - } - else - { - /* This is a valid share mode entry and the process that - created it still exists. Copy it into the output array. - */ - share_array[num_entries_copied].pid = entry_scanner_p->pid; - share_array[num_entries_copied].share_mode = entry_scanner_p->share_mode; - share_array[num_entries_copied].op_port = entry_scanner_p->op_port; - share_array[num_entries_copied].op_type = entry_scanner_p->op_type; - memcpy(&share_array[num_entries_copied].time, &entry_scanner_p->time, - sizeof(struct timeval)); - num_entries_copied++; - DEBUG(5,("get_share_modes (FAST_SHARE_MODES): Read share mode \ -record mode 0x%X pid=%d\n", entry_scanner_p->share_mode, entry_scanner_p->pid)); - entry_prev_p = entry_scanner_p; - entry_scanner_p = (share_mode_entry *) - smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); - } - } - - /* If no valid share mode entries were found then this record shouldn't exist ! */ - if(num_entries_copied == 0) - { - DEBUG(0,("get_share_modes (FAST_SHARE_MODES): file with dev %d, inode %d in \ -hash bucket %d has a share mode record but no entries - deleting\n", - dev, inode, hash_entry)); - if(*old_shares) - free((char *)*old_shares); - *old_shares = 0; - - if(file_prev_p == file_scanner_p) - mode_array[hash_entry] = file_scanner_p->next_offset; - else - file_prev_p->next_offset = file_scanner_p->next_offset; - smb_shm_free(smb_shm_addr2offset(file_scanner_p)); - } - - DEBUG(5,("get_share_modes (FAST_SHARE_MODES): file with dev %d, inode %d in \ -hash bucket %d returning %d entries\n", dev, inode, hash_entry, num_entries_copied)); - - return(num_entries_copied); -} /******************************************************************* -del the share mode of a file. -********************************************************************/ -void del_share_mode(share_lock_token token, int fnum) -{ - uint32 dev, inode; - smb_shm_offset_t *mode_array; - unsigned int hash_entry; - share_mode_record *file_scanner_p; - share_mode_record *file_prev_p; - share_mode_entry *entry_scanner_p; - share_mode_entry *entry_prev_p; - BOOL found = False; - int pid = getpid(); - - dev = Files[fnum].fd_ptr->dev; - inode = Files[fnum].fd_ptr->inode; - - hash_entry = HASH_ENTRY(dev, inode); - - if(hash_entry > lp_shmem_hash_size() ) - { - DEBUG(0, - ("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): hash_entry %d too large \ -(max = %d)\n", - hash_entry, lp_shmem_hash_size() )); - return; - } - - mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); - - if(mode_array[hash_entry] == NULL_OFFSET) - { - DEBUG(0,("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): hash bucket %d empty\n", - hash_entry)); - return; - } - - file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); - file_prev_p = file_scanner_p; - - while(file_scanner_p) - { - if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) - { - found = True; - break; - } - else - { - file_prev_p = file_scanner_p ; - file_scanner_p = (share_mode_record *) - smb_shm_offset2addr(file_scanner_p->next_offset); - } - } - - if(!found) - { - DEBUG(0,("ERROR:del_share_mode (FAST_SHARE_MODES): no entry found for dev %d, \ -inode %d in hash bucket %d\n", dev, inode, hash_entry)); - return; - } - - if(file_scanner_p->locking_version != LOCKING_VERSION) - { - DEBUG(0,("ERROR: del_share_modes (FAST_SHARE_MODES): Deleting old share mode \ -record due to old locking version %d for file dev %d, inode %d hash bucket %d\n", - file_scanner_p->locking_version, dev, inode, hash_entry )); - if(file_prev_p == file_scanner_p) - mode_array[hash_entry] = file_scanner_p->next_offset; - else - file_prev_p->next_offset = file_scanner_p->next_offset; - smb_shm_free(smb_shm_addr2offset(file_scanner_p)); - return; - } - - found = False; - entry_scanner_p = (share_mode_entry*)smb_shm_offset2addr( - file_scanner_p->share_mode_entries); - entry_prev_p = entry_scanner_p; - while(entry_scanner_p) - { - if( (pid == entry_scanner_p->pid) && - (memcmp(&entry_scanner_p->time, - &Files[fnum].open_time,sizeof(struct timeval)) == 0) ) - { - found = True; - break; - } - else - { - entry_prev_p = entry_scanner_p; - entry_scanner_p = (share_mode_entry *) - smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); - } - } - - if (found) - { - /* Decrement the number of entries in the record. */ - file_scanner_p->num_share_mode_entries -= 1; - - DEBUG(2,("del_share_modes (FAST_SHARE_MODES): \ -Deleting share mode entry dev = %d, inode = %d in hash bucket %d (num entries now = %d)\n", - dev, inode, hash_entry, file_scanner_p->num_share_mode_entries)); - if(entry_prev_p == entry_scanner_p) - /* We are at start of list */ - file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry; - else - entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry; - smb_shm_free(smb_shm_addr2offset(entry_scanner_p)); - - /* PARANOIA TEST */ - if(file_scanner_p->num_share_mode_entries < 0) - { - DEBUG(0,("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ -for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, - dev, inode, hash_entry)); - return; - } - - /* If we deleted the last share mode entry then remove the share mode record. */ - if(file_scanner_p->num_share_mode_entries == 0) - { - DEBUG(2,("del_share_modes (FAST_SHARE_MODES): num entries = 0, deleting share_mode \ -record dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); - if(file_prev_p == file_scanner_p) - mode_array[hash_entry] = file_scanner_p->next_offset; - else - file_prev_p->next_offset = file_scanner_p->next_offset; - smb_shm_free(smb_shm_addr2offset(file_scanner_p)); - } - } - else - { - DEBUG(0,("ERROR: del_share_modes (FAST_SHARE_MODES): No share mode record found \ -dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); - } -} - -/******************************************************************* -set the share mode of a file. Return False on fail, True on success. -********************************************************************/ -BOOL set_share_mode(share_lock_token token, int fnum, uint16 port, uint16 op_type) -{ - files_struct *fs_p = &Files[fnum]; - int32 dev, inode; - smb_shm_offset_t *mode_array; - unsigned int hash_entry; - share_mode_record *file_scanner_p; - share_mode_record *file_prev_p; - share_mode_entry *new_entry_p; - smb_shm_offset_t new_entry_offset; - BOOL found = False; - - dev = fs_p->fd_ptr->dev; - inode = fs_p->fd_ptr->inode; - - hash_entry = HASH_ENTRY(dev, inode); - if(hash_entry > lp_shmem_hash_size() ) - { - DEBUG(0, - ("PANIC ERROR:set_share_mode (FAST_SHARE_MODES): hash_entry %d too large \ -(max = %d)\n", - hash_entry, lp_shmem_hash_size() )); - return False; - } - - mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); - - file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); - file_prev_p = file_scanner_p; - - while(file_scanner_p) - { - if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) - { - found = True; - break; - } - else - { - file_prev_p = file_scanner_p ; - file_scanner_p = (share_mode_record *) - smb_shm_offset2addr(file_scanner_p->next_offset); - } - } - - if(!found) - { - /* We must create a share_mode_record */ - share_mode_record *new_mode_p = NULL; - smb_shm_offset_t new_offset = smb_shm_alloc( sizeof(share_mode_record) + - strlen(fs_p->name) + 1); - if(new_offset == NULL_OFFSET) - { - DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail !\n")); - return False; - } - new_mode_p = smb_shm_offset2addr(new_offset); - new_mode_p->locking_version = LOCKING_VERSION; - new_mode_p->st_dev = dev; - new_mode_p->st_ino = inode; - new_mode_p->num_share_mode_entries = 0; - new_mode_p->share_mode_entries = NULL_OFFSET; - strcpy(new_mode_p->file_name, fs_p->name); - - /* Chain onto the start of the hash chain (in the hope we will be used first). */ - new_mode_p->next_offset = mode_array[hash_entry]; - mode_array[hash_entry] = new_offset; - - file_scanner_p = new_mode_p; - - DEBUG(3,("set_share_mode (FAST_SHARE_MODES): Created share record for %s (dev %d \ -inode %d in hash bucket %d\n", fs_p->name, dev, inode, hash_entry)); - } - - /* Now create the share mode entry */ - new_entry_offset = smb_shm_alloc( sizeof(share_mode_entry)); - if(new_entry_offset == NULL_OFFSET) - { - smb_shm_offset_t delete_offset = mode_array[hash_entry]; - DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail 1!\n")); - /* Unlink the damaged record */ - mode_array[hash_entry] = file_scanner_p->next_offset; - /* And delete it */ - smb_shm_free( delete_offset ); - return False; - } - - new_entry_p = smb_shm_offset2addr(new_entry_offset); - - new_entry_p->pid = getpid(); - new_entry_p->share_mode = fs_p->share_mode; - new_entry_p->op_port = port; - new_entry_p->op_type = op_type; - memcpy( (char *)&new_entry_p->time, (char *)&fs_p->open_time, sizeof(struct timeval)); - - /* Chain onto the share_mode_record */ - new_entry_p->next_share_mode_entry = file_scanner_p->share_mode_entries; - file_scanner_p->share_mode_entries = new_entry_offset; - - /* PARANOIA TEST */ - if(file_scanner_p->num_share_mode_entries < 0) - { - DEBUG(0,("PANIC ERROR:set_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ -for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, - dev, inode, hash_entry)); - return False; - } - - /* Increment the share_mode_entries counter */ - file_scanner_p->num_share_mode_entries += 1; - - DEBUG(3,("set_share_mode (FAST_SHARE_MODES): Created share entry for %s with mode \ -0x%X pid=%d (num_entries now = %d)\n",fs_p->name, fs_p->share_mode, new_entry_p->pid, - file_scanner_p->num_share_mode_entries)); - - return(True); -} - -/******************************************************************* -Remove an oplock port and mode entry from a share mode. -********************************************************************/ -BOOL remove_share_oplock(int fnum, share_lock_token token) -{ - uint32 dev, inode; - smb_shm_offset_t *mode_array; - unsigned int hash_entry; - share_mode_record *file_scanner_p; - share_mode_record *file_prev_p; - share_mode_entry *entry_scanner_p; - share_mode_entry *entry_prev_p; - BOOL found = False; - int pid = getpid(); - - dev = Files[fnum].fd_ptr->dev; - inode = Files[fnum].fd_ptr->inode; - - hash_entry = HASH_ENTRY(dev, inode); - - if(hash_entry > lp_shmem_hash_size() ) - { - DEBUG(0, - ("PANIC ERROR:remove_share_oplock (FAST_SHARE_MODES): hash_entry %d too large \ -(max = %d)\n", - hash_entry, lp_shmem_hash_size() )); - return False; - } - - mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); - - if(mode_array[hash_entry] == NULL_OFFSET) - { - DEBUG(0,("PANIC ERROR:remove_share_oplock (FAST_SHARE_MODES): hash bucket %d empty\n", - hash_entry)); - return False; - } - - file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); - file_prev_p = file_scanner_p; - - while(file_scanner_p) - { - if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) - { - found = True; - break; - } - else - { - file_prev_p = file_scanner_p ; - file_scanner_p = (share_mode_record *) - smb_shm_offset2addr(file_scanner_p->next_offset); - } - } - - if(!found) - { - DEBUG(0,("ERROR:remove_share_oplock (FAST_SHARE_MODES): no entry found for dev %d, \ -inode %d in hash bucket %d\n", dev, inode, hash_entry)); - return False; - } - - if(file_scanner_p->locking_version != LOCKING_VERSION) - { - DEBUG(0,("ERROR: remove_share_oplock (FAST_SHARE_MODES): Deleting old share mode \ -record due to old locking version %d for file dev %d, inode %d hash bucket %d\n", - file_scanner_p->locking_version, dev, inode, hash_entry )); - if(file_prev_p == file_scanner_p) - mode_array[hash_entry] = file_scanner_p->next_offset; - else - file_prev_p->next_offset = file_scanner_p->next_offset; - smb_shm_free(smb_shm_addr2offset(file_scanner_p)); - return False; - } - - found = False; - entry_scanner_p = (share_mode_entry*)smb_shm_offset2addr( - file_scanner_p->share_mode_entries); - entry_prev_p = entry_scanner_p; - while(entry_scanner_p) - { - if( (pid == entry_scanner_p->pid) && - (entry_scanner_p->share_mode == Files[fnum].share_mode) && - (memcmp(&entry_scanner_p->time, - &Files[fnum].open_time,sizeof(struct timeval)) == 0) ) - { - /* Delete the oplock info. */ - entry_scanner_p->op_port = 0; - entry_scanner_p->op_type = 0; - found = True; - break; - } - else - { - entry_prev_p = entry_scanner_p; - entry_scanner_p = (share_mode_entry *) - smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); - } - } - - if(!found) - { - DEBUG(0,("ERROR: remove_share_oplock (FAST_SHARE_MODES): No oplock granted share \ -mode record found dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); - return False; - } - - return True; -} - -#else /* FAST_SHARE_MODES */ - -/* SHARE MODE LOCKS USING SLOW DESCRIPTION FILES */ - -/******************************************************************* - name a share file + lock a hash bucket entry ******************************************************************/ -static BOOL share_name(int cnum, uint32 dev, uint32 inode, char *name) -{ - strcpy(name,lp_lockdir()); - standard_sub(cnum,name); - trim_string(name,"","/"); - if (!*name) return(False); - name += strlen(name); - - sprintf(name,"/share.%u.%u",dev,inode); - return(True); -} - -/******************************************************************* -Force a share file to be deleted. -********************************************************************/ - -static int delete_share_file( int cnum, char *fname ) +BOOL lock_share_entry(int cnum, uint32 dev, uint32 inode, int *ptok) { - /* the share file could be owned by anyone, so do this as root */ - become_root(False); - - if(unlink(fname) != 0) - { - DEBUG(0,("delete_share_file: Can't delete share file %s (%s)\n", - fname, strerror(errno))); - } - else - { - DEBUG(5,("delete_share_file: Deleted share file %s\n", fname)); - } - - /* return to our previous privilage level */ - unbecome_root(False); - - return 0; + return share_ops->lock_entry(cnum, dev, inode, ptok); } /******************************************************************* - lock a share mode file. + unlock a hash bucket entry ******************************************************************/ -BOOL lock_share_entry(int cnum, uint32 dev, uint32 inode, share_lock_token *ptok) +BOOL unlock_share_entry(int cnum, uint32 dev, uint32 inode, int token) { - pstring fname; - int fd; - int ret = True; - - *ptok = (share_lock_token)-1; - - if(!share_name(cnum, dev, inode, fname)) - return False; - - /* we need to do this as root */ - become_root(False); - - { - int old_umask; - BOOL gotlock = False; - old_umask = umask(0); - - /* - * There was a race condition in the original slow share mode code. - * A smbd could open a share mode file, and before getting - * the lock, another smbd could delete the last entry for - * the share mode file and delete the file entry from the - * directory. Thus this smbd would be left with a locked - * share mode fd attached to a file that no longer had a - * directory entry. Thus another smbd would think that - * there were no outstanding opens on the file. To fix - * this we now check we can do a stat() call on the filename - * before allowing the lock to proceed, and back out completely - * and try the open again if we cannot. - * Jeremy Allison (jallison@whistle.com). - */ - - do - { - struct stat dummy_stat; - -#ifdef SECURE_SHARE_MODES - fd = (share_lock_token)open(fname,O_RDWR|O_CREAT,0600); -#else /* SECURE_SHARE_MODES */ - fd = (share_lock_token)open(fname,O_RDWR|O_CREAT,0666); -#endif /* SECURE_SHARE_MODES */ - - if(fd < 0) - { - DEBUG(0,("ERROR lock_share_entry: failed to open share file %s. Error was %s\n", - fname, strerror(errno))); - ret = False; - break; - } - - /* At this point we have an open fd to the share mode file. - Lock the first byte exclusively to signify a lock. */ - if(fcntl_lock(fd, F_SETLKW, 0, 1, F_WRLCK) == False) - { - DEBUG(0,("ERROR lock_share_entry: fcntl_lock on file %s failed with %s\n", - fname, strerror(errno))); - close(fd); - ret = False; - break; - } - - /* - * If we cannot stat the filename, the file was deleted between - * the open and the lock call. Back out and try again. - */ - - if(stat(fname, &dummy_stat)!=0) - { - DEBUG(2,("lock_share_entry: Re-issuing open on %s to fix race. Error was %s\n", - fname, strerror(errno))); - close(fd); - } - else - gotlock = True; - } while(!gotlock); - - /* - * We have to come here if any of the above calls fail - * as we don't want to return and leave ourselves running - * as root ! - */ - - umask(old_umask); - } - - *ptok = (share_lock_token)fd; - - /* return to our previous privilage level */ - unbecome_root(False); - - return ret; + return share_ops->unlock_entry(cnum, dev, inode, token); } /******************************************************************* - unlock a share mode file. - ******************************************************************/ -BOOL unlock_share_entry(int cnum, uint32 dev, uint32 inode, share_lock_token token) +get all share mode entries for a dev/inode pair. +********************************************************************/ +int get_share_modes(int cnum, int token, uint32 dev, uint32 inode, + share_mode_entry **shares) { - int fd = (int)token; - int ret = True; - struct stat sb; - pstring fname; - - /* Fix for zero length share files from - Gerald Werner <wernerg@mfldclin.edu> */ - - share_name(cnum, dev, inode, fname); - - /* get the share mode file size */ - if(fstat((int)token, &sb) != 0) - { - DEBUG(0,("ERROR: unlock_share_entry: Failed to do stat on share file %s (%s)\n", - fname, strerror(errno))); - sb.st_size = 1; - ret = False; - } - - /* If the file was zero length, we must delete before - doing the unlock to avoid a race condition (see - the code in lock_share_mode_entry for details. - */ - - /* remove the share file if zero length */ - if(sb.st_size == 0) - delete_share_file(cnum, fname); - - /* token is the fd of the open share mode file. */ - /* Unlock the first byte. */ - if(fcntl_lock(fd, F_SETLKW, 0, 1, F_UNLCK) == False) - { - DEBUG(0,("ERROR unlock_share_entry: fcntl_lock failed with %s\n", - strerror(errno))); - ret = False; - } - - close(fd); - return ret; + return share_ops->get_entries(cnum, token, dev, inode, shares); } /******************************************************************* -Read a share file into a buffer. +del the share mode of a file. ********************************************************************/ - -static int read_share_file(int cnum, int fd, char *fname, char **out, BOOL *p_new_file) +void del_share_mode(int token, int fnum) { - struct stat sb; - char *buf; - int size; - - *out = 0; - *p_new_file = False; - - if(fstat(fd, &sb) != 0) - { - DEBUG(0,("ERROR: read_share_file: Failed to do stat on share file %s (%s)\n", - fname, strerror(errno))); - return -1; - } - - if(sb.st_size == 0) - { - *p_new_file = True; - return 0; - } - - /* Allocate space for the file */ - if((buf = (char *)malloc(sb.st_size)) == NULL) - { - DEBUG(0,("read_share_file: malloc for file size %d fail !\n", sb.st_size)); - return -1; - } - - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: read_share_file: Failed to reset position to 0 \ -for share file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return -1; - } - - if (read(fd,buf,sb.st_size) != sb.st_size) - { - DEBUG(0,("ERROR: read_share_file: Failed to read share file %s (%s)\n", - fname, strerror(errno))); - if(buf) - free(buf); - return -1; - } - - if (IVAL(buf,SMF_VERSION_OFFSET) != LOCKING_VERSION) { - DEBUG(0,("ERROR: read_share_file: share file %s has incorrect \ -locking version (was %d, should be %d).\n",fname, - IVAL(buf,SMF_VERSION_OFFSET), LOCKING_VERSION)); - if(buf) - free(buf); - delete_share_file(cnum, fname); - return -1; - } - - /* Sanity check for file contents */ - size = sb.st_size; - size -= SMF_HEADER_LENGTH; /* Remove the header */ - - /* Remove the filename component. */ - size -= SVAL(buf, SMF_FILENAME_LEN_OFFSET); - - /* The remaining size must be a multiple of SMF_ENTRY_LENGTH - error if not. */ - if((size % SMF_ENTRY_LENGTH) != 0) - { - DEBUG(0,("ERROR: read_share_file: share file %s is an incorrect length - \ -deleting it.\n", fname)); - if(buf) - free(buf); - delete_share_file(cnum, fname); - return -1; - } - - *out = buf; - return 0; + share_ops->del_entry(token, fnum); } /******************************************************************* -get all share mode entries in a share file for a dev/inode pair. +set the share mode of a file. Return False on fail, True on success. ********************************************************************/ -int get_share_modes(int cnum, share_lock_token token, uint32 dev, uint32 inode, - min_share_mode_entry **old_shares) +BOOL set_share_mode(int token, int fnum, uint16 port, uint16 op_type) { - int fd = (int)token; - pstring fname; - int i; - int num_entries; - int num_entries_copied; - int newsize; - min_share_mode_entry *share_array; - char *buf = 0; - char *base = 0; - BOOL new_file; - - *old_shares = 0; - - /* Read the share file header - this is of the form: - 0 - locking version. - 4 - number of share mode entries. - 8 - 2 byte name length - [n bytes] file name (zero terminated). - - Followed by <n> share mode entries of the form : - - 0 - tv_sec - 4 - tv_usec - 8 - share_mode - 12 - pid - 16 - oplock port (if oplocks in use) - 2 bytes. - */ - - share_name(cnum, dev, inode, fname); - - if(read_share_file( cnum, fd, fname, &buf, &new_file) != 0) - { - DEBUG(0,("ERROR: get_share_modes: Failed to read share file %s\n", - fname)); - return 0; - } - - if(new_file == True) - return 0; - - num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); - - DEBUG(5,("get_share_modes: share file %s has %d share mode entries.\n", - fname, num_entries)); - - /* PARANOIA TEST */ - if(num_entries < 0) - { - DEBUG(0,("PANIC ERROR:get_share_mode: num_share_mode_entries < 0 (%d) \ -for share file %d\n", num_entries, fname)); - return 0; - } - - if(num_entries) - { - *old_shares = share_array = (min_share_mode_entry *) - malloc(num_entries * sizeof(min_share_mode_entry)); - if(*old_shares == 0) - { - DEBUG(0,("get_share_modes: malloc fail !\n")); - return 0; - } - } - else - { - /* No entries - just delete the file. */ - DEBUG(0,("get_share_modes: share file %s has no share mode entries - deleting.\n", - fname)); - if(buf) - free(buf); - delete_share_file(cnum, fname); - return 0; - } - - num_entries_copied = 0; - base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); - - for( i = 0; i < num_entries; i++) - { - int pid; - char *p = base + (i*SMF_ENTRY_LENGTH); - - pid = IVAL(p,SME_PID_OFFSET); - - if(!process_exists(pid)) - { - DEBUG(0,("get_share_modes: process %d no longer exists and \ -it left a share mode entry with mode 0x%X in share file %s\n", - pid, IVAL(p,SME_SHAREMODE_OFFSET), fname)); - continue; - } - share_array[num_entries_copied].time.tv_sec = IVAL(p,SME_SEC_OFFSET); - share_array[num_entries_copied].time.tv_usec = IVAL(p,SME_USEC_OFFSET); - share_array[num_entries_copied].share_mode = IVAL(p,SME_SHAREMODE_OFFSET); - share_array[num_entries_copied].pid = pid; - share_array[num_entries_copied].op_port = SVAL(p,SME_PORT_OFFSET); - share_array[num_entries_copied].op_type = SVAL(p,SME_OPLOCK_TYPE_OFFSET); - - num_entries_copied++; - } - - if(num_entries_copied == 0) - { - /* Delete the whole file. */ - DEBUG(0,("get_share_modes: share file %s had no valid entries - deleting it !\n", - fname)); - if(*old_shares) - free((char *)*old_shares); - *old_shares = 0; - if(buf) - free(buf); - delete_share_file(cnum, fname); - return 0; - } - - /* If we deleted some entries we need to re-write the whole number of - share mode entries back into the file. */ - - if(num_entries_copied != num_entries) - { - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: get_share_modes: lseek failed to reset to \ -position 0 for share mode file %s (%s)\n", fname, strerror(errno))); - if(*old_shares) - free((char *)*old_shares); - *old_shares = 0; - if(buf) - free(buf); - return 0; - } - - SIVAL(buf, SMF_NUM_ENTRIES_OFFSET, num_entries_copied); - for( i = 0; i < num_entries_copied; i++) - { - char *p = base + (i*SMF_ENTRY_LENGTH); - - SIVAL(p,SME_PID_OFFSET,share_array[i].pid); - SIVAL(p,SME_SHAREMODE_OFFSET,share_array[i].share_mode); - SIVAL(p,SME_SEC_OFFSET,share_array[i].time.tv_sec); - SIVAL(p,SME_USEC_OFFSET,share_array[i].time.tv_usec); - SSVAL(p,SME_PORT_OFFSET,share_array[i].op_port); - SSVAL(p,SME_OPLOCK_TYPE_OFFSET,share_array[i].op_type); - } - - newsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries_copied); - if(write(fd, buf, newsize) != newsize) - { - DEBUG(0,("ERROR: get_share_modes: failed to re-write share \ -mode file %s (%s)\n", fname, strerror(errno))); - if(*old_shares) - free((char *)*old_shares); - *old_shares = 0; - if(buf) - free(buf); - return 0; - } - /* Now truncate the file at this point. */ - if(ftruncate(fd, newsize)!= 0) - { - DEBUG(0,("ERROR: get_share_modes: failed to ftruncate share \ -mode file %s to size %d (%s)\n", fname, newsize, strerror(errno))); - if(*old_shares) - free((char *)*old_shares); - *old_shares = 0; - if(buf) - free(buf); - return 0; - } - } - - if(buf) - free(buf); - - DEBUG(5,("get_share_modes: Read share file %s returning %d entries\n",fname, - num_entries_copied)); - - return num_entries_copied; + return share_ops->set_entry(token, fnum, port, op_type); } /******************************************************************* -del a share mode from a share mode file. +Remove an oplock port and mode entry from a share mode. ********************************************************************/ -void del_share_mode(share_lock_token token, int fnum) +BOOL remove_share_oplock(int fnum, int token) { - pstring fname; - int fd = (int)token; - char *buf = 0; - char *base = 0; - int num_entries; - int newsize; - int i; - files_struct *fs_p = &Files[fnum]; - int pid; - BOOL deleted = False; - BOOL new_file; - - share_name(fs_p->cnum, fs_p->fd_ptr->dev, - fs_p->fd_ptr->inode, fname); - - if(read_share_file( fs_p->cnum, fd, fname, &buf, &new_file) != 0) - { - DEBUG(0,("ERROR: del_share_mode: Failed to read share file %s\n", - fname)); - return; - } - - if(new_file == True) - { - DEBUG(0,("ERROR:del_share_mode: share file %s is new (size zero), deleting it.\n", - fname)); - delete_share_file(fs_p->cnum, fname); - return; - } - - num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); - - DEBUG(5,("del_share_mode: share file %s has %d share mode entries.\n", - fname, num_entries)); - - /* PARANOIA TEST */ - if(num_entries < 0) - { - DEBUG(0,("PANIC ERROR:del_share_mode: num_share_mode_entries < 0 (%d) \ -for share file %d\n", num_entries, fname)); - return; - } - - if(num_entries == 0) - { - /* No entries - just delete the file. */ - DEBUG(0,("del_share_mode: share file %s has no share mode entries - deleting.\n", - fname)); - if(buf) - free(buf); - delete_share_file(fs_p->cnum, fname); - return; - } - - pid = getpid(); - - /* Go through the entries looking for the particular one - we have set - delete it. - */ - - base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); - - for(i = 0; i < num_entries; i++) - { - char *p = base + (i*SMF_ENTRY_LENGTH); - - if((IVAL(p,SME_SEC_OFFSET) != fs_p->open_time.tv_sec) || - (IVAL(p,SME_USEC_OFFSET) != fs_p->open_time.tv_usec) || - (IVAL(p,SME_SHAREMODE_OFFSET) != fs_p->share_mode) || - (IVAL(p,SME_PID_OFFSET) != pid)) - continue; - - DEBUG(5,("del_share_mode: deleting entry number %d (of %d) from the share file %s\n", - i, num_entries, fname)); - - /* Remove this entry. */ - if(i != num_entries - 1) - memcpy(p, p + SMF_ENTRY_LENGTH, (num_entries - i - 1)*SMF_ENTRY_LENGTH); - - deleted = True; - break; - } - - if(!deleted) - { - DEBUG(0,("del_share_mode: entry not found in share file %s\n", fname)); - if(buf) - free(buf); - return; - } - - num_entries--; - SIVAL(buf,SMF_NUM_ENTRIES_OFFSET, num_entries); - - if(num_entries == 0) - { - /* Deleted the last entry - remove the file. */ - DEBUG(5,("del_share_mode: removed last entry in share file - deleting share file %s\n", - fname)); - if(buf) - free(buf); - delete_share_file(fs_p->cnum,fname); - return; - } + return share_ops->remove_oplock(fnum, token); +} - /* Re-write the file - and truncate it at the correct point. */ - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: del_share_mode: lseek failed to reset to \ -position 0 for share mode file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return; - } - newsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries); - if(write(fd, buf, newsize) != newsize) - { - DEBUG(0,("ERROR: del_share_mode: failed to re-write share \ -mode file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return; - } - /* Now truncate the file at this point. */ - if(ftruncate(fd, newsize) != 0) - { - DEBUG(0,("ERROR: del_share_mode: failed to ftruncate share \ -mode file %s to size %d (%s)\n", fname, newsize, strerror(errno))); - if(buf) - free(buf); - return; - } -} - /******************************************************************* -set the share mode of a file +call the specified function on each entry under management by the +share mode system ********************************************************************/ -BOOL set_share_mode(share_lock_token token,int fnum, uint16 port, uint16 op_type) +int share_mode_forall(void (*fn)(share_mode_entry *, char *)) { - files_struct *fs_p = &Files[fnum]; - pstring fname; - int fd = (int)token; - int pid = (int)getpid(); - struct stat sb; - char *buf; - int num_entries; - int header_size; - char *p; - - share_name(fs_p->cnum, fs_p->fd_ptr->dev, - fs_p->fd_ptr->inode, fname); - - if(fstat(fd, &sb) != 0) - { - DEBUG(0,("ERROR: set_share_mode: Failed to do stat on share file %s\n", - fname)); - return False; - } - - /* Sanity check for file contents (if it's not a new share file). */ - if(sb.st_size != 0) - { - int size = sb.st_size; - - /* Allocate space for the file plus one extra entry */ - if((buf = (char *)malloc(sb.st_size + SMF_ENTRY_LENGTH)) == NULL) - { - DEBUG(0,("set_share_mode: malloc for file size %d fail !\n", - sb.st_size + SMF_ENTRY_LENGTH)); - return False; - } - - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: set_share_mode: Failed to reset position \ -to 0 for share file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return False; - } - - if (read(fd,buf,sb.st_size) != sb.st_size) - { - DEBUG(0,("ERROR: set_share_mode: Failed to read share file %s (%s)\n", - fname, strerror(errno))); - if(buf) - free(buf); - return False; - } - - if (IVAL(buf,SMF_VERSION_OFFSET) != LOCKING_VERSION) - { - DEBUG(0,("ERROR: set_share_mode: share file %s has incorrect \ -locking version (was %d, should be %d).\n",fname, IVAL(buf,SMF_VERSION_OFFSET), - LOCKING_VERSION)); - if(buf) - free(buf); - delete_share_file(fs_p->cnum, fname); - return False; - } - - size -= (SMF_HEADER_LENGTH + SVAL(buf, SMF_FILENAME_LEN_OFFSET)); /* Remove the header */ - - /* The remaining size must be a multiple of SMF_ENTRY_LENGTH - error if not. */ - if((size % SMF_ENTRY_LENGTH) != 0) - { - DEBUG(0,("ERROR: set_share_mode: share file %s is an incorrect length - \ -deleting it.\n", fname)); - if(buf) - free(buf); - delete_share_file(fs_p->cnum, fname); - return False; - } - - } - else - { - /* New file - just use a single_entry. */ - if((buf = (char *)malloc(SMF_HEADER_LENGTH + - strlen(fs_p->name) + 1 + SMF_ENTRY_LENGTH)) == NULL) - { - DEBUG(0,("ERROR: set_share_mode: malloc failed for single entry.\n")); - return False; - } - SIVAL(buf,SMF_VERSION_OFFSET,LOCKING_VERSION); - SIVAL(buf,SMF_NUM_ENTRIES_OFFSET,0); - SSVAL(buf,SMF_FILENAME_LEN_OFFSET,strlen(fs_p->name) + 1); - strcpy(buf + SMF_HEADER_LENGTH, fs_p->name); - } - - num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); - header_size = SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); - p = buf + header_size + (num_entries * SMF_ENTRY_LENGTH); - SIVAL(p,SME_SEC_OFFSET,fs_p->open_time.tv_sec); - SIVAL(p,SME_USEC_OFFSET,fs_p->open_time.tv_usec); - SIVAL(p,SME_SHAREMODE_OFFSET,fs_p->share_mode); - SIVAL(p,SME_PID_OFFSET,pid); - SSVAL(p,SME_PORT_OFFSET,port); - SSVAL(p,SME_OPLOCK_TYPE_OFFSET,op_type); - - num_entries++; - - SIVAL(buf,SMF_NUM_ENTRIES_OFFSET,num_entries); - - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: set_share_mode: (1) Failed to reset position to \ -0 for share file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return False; - } - - if (write(fd,buf,header_size + (num_entries*SMF_ENTRY_LENGTH)) != - (header_size + (num_entries*SMF_ENTRY_LENGTH))) - { - DEBUG(2,("ERROR: set_share_mode: Failed to write share file %s - \ -deleting it (%s).\n",fname, strerror(errno))); - delete_share_file(fs_p->cnum, fname); - if(buf) - free(buf); - return False; - } - - /* Now truncate the file at this point - just for safety. */ - if(ftruncate(fd, header_size + (SMF_ENTRY_LENGTH*num_entries))!= 0) - { - DEBUG(0,("ERROR: set_share_mode: failed to ftruncate share \ -mode file %s to size %d (%s)\n", fname, header_size + (SMF_ENTRY_LENGTH*num_entries), - strerror(errno))); - if(buf) - free(buf); - return False; - } - - if(buf) - free(buf); - - DEBUG(3,("set_share_mode: Created share file %s with \ -mode 0x%X pid=%d\n",fname,fs_p->share_mode,pid)); - - return True; + return share_ops->forall(fn); } /******************************************************************* -Remove an oplock port and mode entry from a share mode. +dump the state of the system ********************************************************************/ -BOOL remove_share_oplock(int fnum, share_lock_token token) +void share_status(FILE *f) { - pstring fname; - int fd = (int)token; - char *buf = 0; - char *base = 0; - int num_entries; - int fsize; - int i; - files_struct *fs_p = &Files[fnum]; - int pid; - BOOL found = False; - BOOL new_file; - - share_name(fs_p->cnum, fs_p->fd_ptr->dev, - fs_p->fd_ptr->inode, fname); - - if(read_share_file( fs_p->cnum, fd, fname, &buf, &new_file) != 0) - { - DEBUG(0,("ERROR: remove_share_oplock: Failed to read share file %s\n", - fname)); - return False; - } - - if(new_file == True) - { - DEBUG(0,("ERROR: remove_share_oplock: share file %s is new (size zero), \ -deleting it.\n", fname)); - delete_share_file(fs_p->cnum, fname); - return False; - } - - num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); - - DEBUG(5,("remove_share_oplock: share file %s has %d share mode entries.\n", - fname, num_entries)); - - /* PARANOIA TEST */ - if(num_entries < 0) - { - DEBUG(0,("PANIC ERROR:remove_share_oplock: num_share_mode_entries < 0 (%d) \ -for share file %d\n", num_entries, fname)); - return False; - } - - if(num_entries == 0) - { - /* No entries - just delete the file. */ - DEBUG(0,("remove_share_oplock: share file %s has no share mode entries - deleting.\n", - fname)); - if(buf) - free(buf); - delete_share_file(fs_p->cnum, fname); - return False; - } - - pid = getpid(); - - /* Go through the entries looking for the particular one - we have set - remove the oplock settings on it. - */ - - base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); - - for(i = 0; i < num_entries; i++) - { - char *p = base + (i*SMF_ENTRY_LENGTH); - - if((IVAL(p,SME_SEC_OFFSET) != fs_p->open_time.tv_sec) || - (IVAL(p,SME_USEC_OFFSET) != fs_p->open_time.tv_usec) || - (IVAL(p,SME_SHAREMODE_OFFSET) != fs_p->share_mode) || - (IVAL(p,SME_PID_OFFSET) != pid)) - continue; - - DEBUG(5,("remove_share_oplock: clearing oplock on entry number %d (of %d) \ -from the share file %s\n", i, num_entries, fname)); - - SSVAL(p,SME_PORT_OFFSET,0); - SSVAL(p,SME_OPLOCK_TYPE_OFFSET,0); - found = True; - break; - } - - if(!found) - { - DEBUG(0,("remove_share_oplock: entry not found in share file %s\n", fname)); - if(buf) - free(buf); - return False; - } - - /* Re-write the file - and truncate it at the correct point. */ - if(lseek(fd, 0, SEEK_SET) != 0) - { - DEBUG(0,("ERROR: remove_share_oplock: lseek failed to reset to \ -position 0 for share mode file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return False; - } - - fsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries); - if(write(fd, buf, fsize) != fsize) - { - DEBUG(0,("ERROR: remove_share_oplock: failed to re-write share \ -mode file %s (%s)\n", fname, strerror(errno))); - if(buf) - free(buf); - return False; - } - - return True; - + share_ops->status(f); } -#endif /* FAST_SHARE_MODES */ diff --git a/source3/locking/locking_shm.c b/source3/locking/locking_shm.c new file mode 100644 index 0000000000..99d981ed20 --- /dev/null +++ b/source3/locking/locking_shm.c @@ -0,0 +1,739 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + shared memory locking implementation + Copyright (C) Andrew Tridgell 1992-1997 + + 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. + + October 1997 - split into separate file (tridge) +*/ + +#ifdef FAST_SHARE_MODES + +#include "includes.h" +extern int DEBUGLEVEL; +extern connection_struct Connections[]; +extern files_struct Files[]; + +/* share mode record pointed to in shared memory hash bucket */ +typedef struct +{ + smb_shm_offset_t next_offset; /* offset of next record in chain from hash bucket */ + int locking_version; + int32 st_dev; + int32 st_ino; + int num_share_mode_entries; + smb_shm_offset_t share_mode_entries; /* Chain of share mode entries for this file */ + char file_name[1]; +} share_mode_record; + +/* share mode entry pointed to by share_mode_record struct */ +typedef struct +{ + smb_shm_offset_t next_share_mode_entry; + share_mode_entry e; +} shm_share_mode_entry; + + +/******************************************************************* + deinitialize the shared memory for share_mode management + ******************************************************************/ +static BOOL shm_stop_share_mode_mgmt(void) +{ + return smb_shm_close(); +} + +/******************************************************************* + lock a hash bucket entry in shared memory for share_mode management + ******************************************************************/ +static BOOL shm_lock_share_entry(int cnum, uint32 dev, uint32 inode, int *ptok) +{ + return smb_shm_lock_hash_entry(HASH_ENTRY(dev, inode)); +} + +/******************************************************************* + unlock a hash bucket entry in shared memory for share_mode management + ******************************************************************/ +static BOOL shm_unlock_share_entry(int cnum, uint32 dev, uint32 inode, int token) +{ + return smb_shm_unlock_hash_entry(HASH_ENTRY(dev, inode)); +} + +/******************************************************************* +get all share mode entries in shared memory for a dev/inode pair. +********************************************************************/ +static int shm_get_share_modes(int cnum, int token, uint32 dev, uint32 inode, + share_mode_entry **old_shares) +{ + smb_shm_offset_t *mode_array; + unsigned int hash_entry = HASH_ENTRY(dev, inode); + share_mode_record *file_scanner_p; + share_mode_record *file_prev_p; + shm_share_mode_entry *entry_scanner_p; + shm_share_mode_entry *entry_prev_p; + int num_entries; + int num_entries_copied; + BOOL found = False; + share_mode_entry *share_array = (share_mode_entry *)0; + + *old_shares = 0; + + if(hash_entry > lp_shmem_hash_size() ) + { + DEBUG(0, + ("PANIC ERROR : get_share_modes (FAST_SHARE_MODES): hash_entry %d too large \ +(max = %d)\n", + hash_entry, lp_shmem_hash_size() )); + return 0; + } + + mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); + + if(mode_array[hash_entry] == NULL_OFFSET) + { + DEBUG(5,("get_share_modes (FAST_SHARE_MODES): hash bucket %d empty\n", hash_entry)); + return 0; + } + + file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); + file_prev_p = file_scanner_p; + while(file_scanner_p) + { + if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) + { + found = True; + break; + } + else + { + file_prev_p = file_scanner_p ; + file_scanner_p = (share_mode_record *)smb_shm_offset2addr( + file_scanner_p->next_offset); + } + } + + if(!found) + { + DEBUG(5,("get_share_modes (FAST_SHARE_MODES): no entry for \ +file dev = %d, ino = %d in hash_bucket %d\n", dev, inode, hash_entry)); + return (0); + } + + if(file_scanner_p->locking_version != LOCKING_VERSION) + { + DEBUG(0,("ERROR:get_share_modes (FAST_SHARE_MODES): Deleting old share mode \ +record due to old locking version %d for file dev = %d, inode = %d in hash \ +bucket %d\n", file_scanner_p->locking_version, dev, inode, hash_entry)); + if(file_prev_p == file_scanner_p) + mode_array[hash_entry] = file_scanner_p->next_offset; + else + file_prev_p->next_offset = file_scanner_p->next_offset; + smb_shm_free(smb_shm_addr2offset(file_scanner_p)); + return (0); + } + + /* Allocate the old_shares array */ + num_entries = file_scanner_p->num_share_mode_entries; + if(num_entries) + { + *old_shares = share_array = (share_mode_entry *) + malloc(num_entries * sizeof(share_mode_entry)); + if(*old_shares == 0) + { + DEBUG(0,("get_share_modes (FAST_SHARE_MODES): malloc fail !\n")); + return 0; + } + } + + num_entries_copied = 0; + + entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr( + file_scanner_p->share_mode_entries); + entry_prev_p = entry_scanner_p; + while(entry_scanner_p) + { + int pid = entry_scanner_p->e.pid; + + if (pid && !process_exists(pid)) + { + /* Delete this share mode entry */ + shm_share_mode_entry *delete_entry_p = entry_scanner_p; + int share_mode = entry_scanner_p->e.share_mode; + + if(entry_prev_p == entry_scanner_p) + { + /* We are at start of list */ + file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry; + entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr( + file_scanner_p->share_mode_entries); + entry_prev_p = entry_scanner_p; + } + else + { + entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry; + entry_scanner_p = (shm_share_mode_entry*) + smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); + } + /* Decrement the number of share mode entries on this share mode record */ + file_scanner_p->num_share_mode_entries -= 1; + + /* PARANOIA TEST */ + if(file_scanner_p->num_share_mode_entries < 0) + { + DEBUG(0,("PANIC ERROR:get_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ +for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, + dev, inode, hash_entry)); + return 0; + } + + DEBUG(0,("get_share_modes (FAST_SHARE_MODES): process %d no longer exists and \ +it left a share mode entry with mode 0x%X for file dev = %d, ino = %d in hash \ +bucket %d (number of entries now = %d)\n", + pid, share_mode, dev, inode, hash_entry, + file_scanner_p->num_share_mode_entries)); + + smb_shm_free(smb_shm_addr2offset(delete_entry_p)); + } + else + { + /* This is a valid share mode entry and the process that + created it still exists. Copy it into the output array. + */ + share_array[num_entries_copied].pid = entry_scanner_p->e.pid; + share_array[num_entries_copied].share_mode = entry_scanner_p->e.share_mode; + share_array[num_entries_copied].op_port = entry_scanner_p->e.op_port; + share_array[num_entries_copied].op_type = entry_scanner_p->e.op_type; + memcpy(&share_array[num_entries_copied].time, &entry_scanner_p->e.time, + sizeof(struct timeval)); + num_entries_copied++; + DEBUG(5,("get_share_modes (FAST_SHARE_MODES): Read share mode \ +record mode 0x%X pid=%d\n", entry_scanner_p->e.share_mode, entry_scanner_p->e.pid)); + entry_prev_p = entry_scanner_p; + entry_scanner_p = (shm_share_mode_entry *) + smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); + } + } + + /* If no valid share mode entries were found then this record shouldn't exist ! */ + if(num_entries_copied == 0) + { + DEBUG(0,("get_share_modes (FAST_SHARE_MODES): file with dev %d, inode %d in \ +hash bucket %d has a share mode record but no entries - deleting\n", + dev, inode, hash_entry)); + if(*old_shares) + free((char *)*old_shares); + *old_shares = 0; + + if(file_prev_p == file_scanner_p) + mode_array[hash_entry] = file_scanner_p->next_offset; + else + file_prev_p->next_offset = file_scanner_p->next_offset; + smb_shm_free(smb_shm_addr2offset(file_scanner_p)); + } + + DEBUG(5,("get_share_modes (FAST_SHARE_MODES): file with dev %d, inode %d in \ +hash bucket %d returning %d entries\n", dev, inode, hash_entry, num_entries_copied)); + + return(num_entries_copied); +} + +/******************************************************************* +del the share mode of a file. +********************************************************************/ +static void shm_del_share_mode(int token, int fnum) +{ + uint32 dev, inode; + smb_shm_offset_t *mode_array; + unsigned int hash_entry; + share_mode_record *file_scanner_p; + share_mode_record *file_prev_p; + shm_share_mode_entry *entry_scanner_p; + shm_share_mode_entry *entry_prev_p; + BOOL found = False; + int pid = getpid(); + + dev = Files[fnum].fd_ptr->dev; + inode = Files[fnum].fd_ptr->inode; + + hash_entry = HASH_ENTRY(dev, inode); + + if(hash_entry > lp_shmem_hash_size() ) + { + DEBUG(0, + ("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): hash_entry %d too large \ +(max = %d)\n", + hash_entry, lp_shmem_hash_size() )); + return; + } + + mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); + + if(mode_array[hash_entry] == NULL_OFFSET) + { + DEBUG(0,("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): hash bucket %d empty\n", + hash_entry)); + return; + } + + file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); + file_prev_p = file_scanner_p; + + while(file_scanner_p) + { + if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) + { + found = True; + break; + } + else + { + file_prev_p = file_scanner_p ; + file_scanner_p = (share_mode_record *) + smb_shm_offset2addr(file_scanner_p->next_offset); + } + } + + if(!found) + { + DEBUG(0,("ERROR:del_share_mode (FAST_SHARE_MODES): no entry found for dev %d, \ +inode %d in hash bucket %d\n", dev, inode, hash_entry)); + return; + } + + if(file_scanner_p->locking_version != LOCKING_VERSION) + { + DEBUG(0,("ERROR: del_share_modes (FAST_SHARE_MODES): Deleting old share mode \ +record due to old locking version %d for file dev %d, inode %d hash bucket %d\n", + file_scanner_p->locking_version, dev, inode, hash_entry )); + if(file_prev_p == file_scanner_p) + mode_array[hash_entry] = file_scanner_p->next_offset; + else + file_prev_p->next_offset = file_scanner_p->next_offset; + smb_shm_free(smb_shm_addr2offset(file_scanner_p)); + return; + } + + found = False; + entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr( + file_scanner_p->share_mode_entries); + entry_prev_p = entry_scanner_p; + while(entry_scanner_p) + { + if( (pid == entry_scanner_p->e.pid) && + (memcmp(&entry_scanner_p->e.time, + &Files[fnum].open_time,sizeof(struct timeval)) == 0) ) + { + found = True; + break; + } + else + { + entry_prev_p = entry_scanner_p; + entry_scanner_p = (shm_share_mode_entry *) + smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); + } + } + + if (found) + { + /* Decrement the number of entries in the record. */ + file_scanner_p->num_share_mode_entries -= 1; + + DEBUG(2,("del_share_modes (FAST_SHARE_MODES): \ +Deleting share mode entry dev = %d, inode = %d in hash bucket %d (num entries now = %d)\n", + dev, inode, hash_entry, file_scanner_p->num_share_mode_entries)); + if(entry_prev_p == entry_scanner_p) + /* We are at start of list */ + file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry; + else + entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry; + smb_shm_free(smb_shm_addr2offset(entry_scanner_p)); + + /* PARANOIA TEST */ + if(file_scanner_p->num_share_mode_entries < 0) + { + DEBUG(0,("PANIC ERROR:del_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ +for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, + dev, inode, hash_entry)); + return; + } + + /* If we deleted the last share mode entry then remove the share mode record. */ + if(file_scanner_p->num_share_mode_entries == 0) + { + DEBUG(2,("del_share_modes (FAST_SHARE_MODES): num entries = 0, deleting share_mode \ +record dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); + if(file_prev_p == file_scanner_p) + mode_array[hash_entry] = file_scanner_p->next_offset; + else + file_prev_p->next_offset = file_scanner_p->next_offset; + smb_shm_free(smb_shm_addr2offset(file_scanner_p)); + } + } + else + { + DEBUG(0,("ERROR: del_share_modes (FAST_SHARE_MODES): No share mode record found \ +dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); + } +} + +/******************************************************************* +set the share mode of a file. Return False on fail, True on success. +********************************************************************/ +static BOOL shm_set_share_mode(int token, int fnum, uint16 port, uint16 op_type) +{ + files_struct *fs_p = &Files[fnum]; + int32 dev, inode; + smb_shm_offset_t *mode_array; + unsigned int hash_entry; + share_mode_record *file_scanner_p; + share_mode_record *file_prev_p; + shm_share_mode_entry *new_entry_p; + smb_shm_offset_t new_entry_offset; + BOOL found = False; + + dev = fs_p->fd_ptr->dev; + inode = fs_p->fd_ptr->inode; + + hash_entry = HASH_ENTRY(dev, inode); + if(hash_entry > lp_shmem_hash_size() ) + { + DEBUG(0, + ("PANIC ERROR:set_share_mode (FAST_SHARE_MODES): hash_entry %d too large \ +(max = %d)\n", + hash_entry, lp_shmem_hash_size() )); + return False; + } + + mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); + + file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); + file_prev_p = file_scanner_p; + + while(file_scanner_p) + { + if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) + { + found = True; + break; + } + else + { + file_prev_p = file_scanner_p ; + file_scanner_p = (share_mode_record *) + smb_shm_offset2addr(file_scanner_p->next_offset); + } + } + + if(!found) + { + /* We must create a share_mode_record */ + share_mode_record *new_mode_p = NULL; + smb_shm_offset_t new_offset = smb_shm_alloc( sizeof(share_mode_record) + + strlen(fs_p->name) + 1); + if(new_offset == NULL_OFFSET) + { + DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail !\n")); + return False; + } + new_mode_p = smb_shm_offset2addr(new_offset); + new_mode_p->locking_version = LOCKING_VERSION; + new_mode_p->st_dev = dev; + new_mode_p->st_ino = inode; + new_mode_p->num_share_mode_entries = 0; + new_mode_p->share_mode_entries = NULL_OFFSET; + strcpy(new_mode_p->file_name, fs_p->name); + + /* Chain onto the start of the hash chain (in the hope we will be used first). */ + new_mode_p->next_offset = mode_array[hash_entry]; + mode_array[hash_entry] = new_offset; + + file_scanner_p = new_mode_p; + + DEBUG(3,("set_share_mode (FAST_SHARE_MODES): Created share record for %s (dev %d \ +inode %d in hash bucket %d\n", fs_p->name, dev, inode, hash_entry)); + } + + /* Now create the share mode entry */ + new_entry_offset = smb_shm_alloc( sizeof(shm_share_mode_entry)); + if(new_entry_offset == NULL_OFFSET) + { + smb_shm_offset_t delete_offset = mode_array[hash_entry]; + DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail 1!\n")); + /* Unlink the damaged record */ + mode_array[hash_entry] = file_scanner_p->next_offset; + /* And delete it */ + smb_shm_free( delete_offset ); + return False; + } + + new_entry_p = smb_shm_offset2addr(new_entry_offset); + + new_entry_p->e.pid = getpid(); + new_entry_p->e.share_mode = fs_p->share_mode; + new_entry_p->e.op_port = port; + new_entry_p->e.op_type = op_type; + memcpy( (char *)&new_entry_p->e.time, (char *)&fs_p->open_time, sizeof(struct timeval)); + + /* Chain onto the share_mode_record */ + new_entry_p->next_share_mode_entry = file_scanner_p->share_mode_entries; + file_scanner_p->share_mode_entries = new_entry_offset; + + /* PARANOIA TEST */ + if(file_scanner_p->num_share_mode_entries < 0) + { + DEBUG(0,("PANIC ERROR:set_share_mode (FAST_SHARE_MODES): num_share_mode_entries < 0 (%d) \ +for dev = %d, ino = %d, hashbucket %d\n", file_scanner_p->num_share_mode_entries, + dev, inode, hash_entry)); + return False; + } + + /* Increment the share_mode_entries counter */ + file_scanner_p->num_share_mode_entries += 1; + + DEBUG(3,("set_share_mode (FAST_SHARE_MODES): Created share entry for %s with mode \ +0x%X pid=%d (num_entries now = %d)\n",fs_p->name, fs_p->share_mode, new_entry_p->e.pid, + file_scanner_p->num_share_mode_entries)); + + return(True); +} + +/******************************************************************* +Remove an oplock port and mode entry from a share mode. +********************************************************************/ +static BOOL shm_remove_share_oplock(int fnum, int token) +{ + uint32 dev, inode; + smb_shm_offset_t *mode_array; + unsigned int hash_entry; + share_mode_record *file_scanner_p; + share_mode_record *file_prev_p; + shm_share_mode_entry *entry_scanner_p; + shm_share_mode_entry *entry_prev_p; + BOOL found = False; + int pid = getpid(); + + dev = Files[fnum].fd_ptr->dev; + inode = Files[fnum].fd_ptr->inode; + + hash_entry = HASH_ENTRY(dev, inode); + + if(hash_entry > lp_shmem_hash_size() ) + { + DEBUG(0, + ("PANIC ERROR:remove_share_oplock (FAST_SHARE_MODES): hash_entry %d too large \ +(max = %d)\n", + hash_entry, lp_shmem_hash_size() )); + return False; + } + + mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); + + if(mode_array[hash_entry] == NULL_OFFSET) + { + DEBUG(0,("PANIC ERROR:remove_share_oplock (FAST_SHARE_MODES): hash bucket %d empty\n", + hash_entry)); + return False; + } + + file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]); + file_prev_p = file_scanner_p; + + while(file_scanner_p) + { + if( (file_scanner_p->st_dev == dev) && (file_scanner_p->st_ino == inode) ) + { + found = True; + break; + } + else + { + file_prev_p = file_scanner_p ; + file_scanner_p = (share_mode_record *) + smb_shm_offset2addr(file_scanner_p->next_offset); + } + } + + if(!found) + { + DEBUG(0,("ERROR:remove_share_oplock (FAST_SHARE_MODES): no entry found for dev %d, \ +inode %d in hash bucket %d\n", dev, inode, hash_entry)); + return False; + } + + if(file_scanner_p->locking_version != LOCKING_VERSION) + { + DEBUG(0,("ERROR: remove_share_oplock (FAST_SHARE_MODES): Deleting old share mode \ +record due to old locking version %d for file dev %d, inode %d hash bucket %d\n", + file_scanner_p->locking_version, dev, inode, hash_entry )); + if(file_prev_p == file_scanner_p) + mode_array[hash_entry] = file_scanner_p->next_offset; + else + file_prev_p->next_offset = file_scanner_p->next_offset; + smb_shm_free(smb_shm_addr2offset(file_scanner_p)); + return False; + } + + found = False; + entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr( + file_scanner_p->share_mode_entries); + entry_prev_p = entry_scanner_p; + while(entry_scanner_p) + { + if( (pid == entry_scanner_p->e.pid) && + (entry_scanner_p->e.share_mode == Files[fnum].share_mode) && + (memcmp(&entry_scanner_p->e.time, + &Files[fnum].open_time,sizeof(struct timeval)) == 0) ) + { + /* Delete the oplock info. */ + entry_scanner_p->e.op_port = 0; + entry_scanner_p->e.op_type = 0; + found = True; + break; + } + else + { + entry_prev_p = entry_scanner_p; + entry_scanner_p = (shm_share_mode_entry *) + smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry); + } + } + + if(!found) + { + DEBUG(0,("ERROR: remove_share_oplock (FAST_SHARE_MODES): No oplock granted share \ +mode record found dev = %d, inode = %d in hash bucket %d\n", dev, inode, hash_entry)); + return False; + } + + return True; +} + + +/******************************************************************* +call the specified function on each entry under management by the +share ode system +********************************************************************/ +static int shm_share_forall(void (*fn)(share_mode_entry *, char *)) +{ + int i, count=0; + smb_shm_offset_t *mode_array; + share_mode_record *file_scanner_p; + + mode_array = (smb_shm_offset_t *)smb_shm_offset2addr(smb_shm_get_userdef_off()); + + for( i = 0; i < lp_shmem_hash_size(); i++) { + smb_shm_lock_hash_entry(i); + if(mode_array[i] == NULL_OFFSET) { + smb_shm_unlock_hash_entry(i); + continue; + } + + file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[i]); + while((file_scanner_p != 0) && + (file_scanner_p->num_share_mode_entries != 0)) { + shm_share_mode_entry *entry_scanner_p = + (shm_share_mode_entry *) + smb_shm_offset2addr(file_scanner_p->share_mode_entries); + + while(entry_scanner_p != 0) { + + fn(&entry_scanner_p->e, + file_scanner_p->file_name); + + entry_scanner_p = + (shm_share_mode_entry *) + smb_shm_offset2addr( + entry_scanner_p->next_share_mode_entry); + count++; + } /* end while entry_scanner_p */ + file_scanner_p = (share_mode_record *) + smb_shm_offset2addr(file_scanner_p->next_offset); + } /* end while file_scanner_p */ + smb_shm_unlock_hash_entry(i); + } /* end for */ + + return count; +} + + +/******************************************************************* +dump the state of the system +********************************************************************/ +static void shm_share_status(FILE *f) +{ + int bytes_free, bytes_used, bytes_overhead, bytes_total; + + smb_shm_get_usage(&bytes_free, &bytes_used, &bytes_overhead); + bytes_total = bytes_free + bytes_used + bytes_overhead; + + fprintf(f, "Share mode memory usage (bytes):\n"); + fprintf(f, " %d(%d%%) free + %d(%d%%) used + %d(%d%%) overhead = %d(100%%) total\n", + bytes_free, (bytes_free * 100)/bytes_total, + bytes_used, (bytes_used * 100)/bytes_total, + bytes_overhead, (bytes_overhead * 100)/bytes_total, + bytes_total); +} + + +static struct share_ops share_ops = { + shm_stop_share_mode_mgmt, + shm_lock_share_entry, + shm_unlock_share_entry, + shm_get_share_modes, + shm_del_share_mode, + shm_set_share_mode, + shm_remove_share_oplock, + shm_share_forall, + shm_share_status, +}; + +/******************************************************************* + initialize the shared memory for share_mode management + ******************************************************************/ +struct share_ops *locking_shm_init(void) +{ + pstring shmem_file_name; + + pstrcpy(shmem_file_name,lp_lockdir()); + if (!directory_exist(shmem_file_name,NULL)) + mkdir(shmem_file_name,0755); + trim_string(shmem_file_name,"","/"); + if (!*shmem_file_name) return(False); + strcat(shmem_file_name, "/SHARE_MEM_FILE"); + if (smb_shm_open(shmem_file_name, lp_shmem_size())) + return &share_ops; + return NULL; +} + +#else + int locking_shm_dummy_procedure(void) +{return 0;} +#endif + + + diff --git a/source3/locking/locking_slow.c b/source3/locking/locking_slow.c new file mode 100644 index 0000000000..cc646c6ca6 --- /dev/null +++ b/source3/locking/locking_slow.c @@ -0,0 +1,1039 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + slow (lockfile) locking implementation + Copyright (C) Andrew Tridgell 1992-1997 + + 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. + + October 1997 - split into separate file (tridge) +*/ + +#include "includes.h" +extern int DEBUGLEVEL; +extern connection_struct Connections[]; +extern files_struct Files[]; + +/* + * Locking file header lengths & offsets. + */ +#define SMF_VERSION_OFFSET 0 +#define SMF_NUM_ENTRIES_OFFSET 4 +#define SMF_FILENAME_LEN_OFFSET 8 +#define SMF_HEADER_LENGTH 10 + +#define SMF_ENTRY_LENGTH 20 + +/* + * Share mode record offsets. + */ + +#define SME_SEC_OFFSET 0 +#define SME_USEC_OFFSET 4 +#define SME_SHAREMODE_OFFSET 8 +#define SME_PID_OFFSET 12 +#define SME_PORT_OFFSET 16 +#define SME_OPLOCK_TYPE_OFFSET 18 + + +/******************************************************************* + deinitialize share_mode management + ******************************************************************/ +static BOOL slow_stop_share_mode_mgmt(void) +{ + return True; +} + + +/******************************************************************* + name a share file + ******************************************************************/ +static BOOL share_name(int cnum, uint32 dev, uint32 inode, char *name) +{ + strcpy(name,lp_lockdir()); + trim_string(name,"","/"); + if (!*name) return(False); + name += strlen(name); + + sprintf(name,"/share.%u.%u",dev,inode); + return(True); +} + +/******************************************************************* +Force a share file to be deleted. +********************************************************************/ +static int delete_share_file( int cnum, char *fname ) +{ + /* the share file could be owned by anyone, so do this as root */ + become_root(False); + + if(unlink(fname) != 0) + { + DEBUG(0,("delete_share_file: Can't delete share file %s (%s)\n", + fname, strerror(errno))); + } + else + { + DEBUG(5,("delete_share_file: Deleted share file %s\n", fname)); + } + + /* return to our previous privilage level */ + unbecome_root(False); + + return 0; +} + +/******************************************************************* + lock a share mode file. + ******************************************************************/ +static BOOL slow_lock_share_entry(int cnum, uint32 dev, uint32 inode, int *ptok) +{ + pstring fname; + int fd; + int ret = True; + + *ptok = (int)-1; + + if(!share_name(cnum, dev, inode, fname)) + return False; + + /* we need to do this as root */ + become_root(False); + + { + int old_umask; + BOOL gotlock = False; + old_umask = umask(0); + + /* + * There was a race condition in the original slow share mode code. + * A smbd could open a share mode file, and before getting + * the lock, another smbd could delete the last entry for + * the share mode file and delete the file entry from the + * directory. Thus this smbd would be left with a locked + * share mode fd attached to a file that no longer had a + * directory entry. Thus another smbd would think that + * there were no outstanding opens on the file. To fix + * this we now check we can do a stat() call on the filename + * before allowing the lock to proceed, and back out completely + * and try the open again if we cannot. + * Jeremy Allison (jallison@whistle.com). + */ + + do + { + struct stat dummy_stat; + +#ifdef SECURE_SHARE_MODES + fd = (int)open(fname,O_RDWR|O_CREAT,0600); +#else /* SECURE_SHARE_MODES */ + fd = (int)open(fname,O_RDWR|O_CREAT,0666); +#endif /* SECURE_SHARE_MODES */ + + if(fd < 0) + { + DEBUG(0,("ERROR lock_share_entry: failed to open share file %s. Error was %s\n", + fname, strerror(errno))); + ret = False; + break; + } + + /* At this point we have an open fd to the share mode file. + Lock the first byte exclusively to signify a lock. */ + if(fcntl_lock(fd, F_SETLKW, 0, 1, F_WRLCK) == False) + { + DEBUG(0,("ERROR lock_share_entry: fcntl_lock on file %s failed with %s\n", + fname, strerror(errno))); + close(fd); + ret = False; + break; + } + + /* + * If we cannot stat the filename, the file was deleted between + * the open and the lock call. Back out and try again. + */ + + if(stat(fname, &dummy_stat)!=0) + { + DEBUG(2,("lock_share_entry: Re-issuing open on %s to fix race. Error was %s\n", + fname, strerror(errno))); + close(fd); + } + else + gotlock = True; + } while(!gotlock); + + /* + * We have to come here if any of the above calls fail + * as we don't want to return and leave ourselves running + * as root ! + */ + + umask(old_umask); + } + + *ptok = (int)fd; + + /* return to our previous privilage level */ + unbecome_root(False); + + return ret; +} + +/******************************************************************* + unlock a share mode file. + ******************************************************************/ +static BOOL slow_unlock_share_entry(int cnum, uint32 dev, uint32 inode, int token) +{ + int fd = (int)token; + int ret = True; + struct stat sb; + pstring fname; + + /* Fix for zero length share files from + Gerald Werner <wernerg@mfldclin.edu> */ + + share_name(cnum, dev, inode, fname); + + /* get the share mode file size */ + if(fstat((int)token, &sb) != 0) + { + DEBUG(0,("ERROR: unlock_share_entry: Failed to do stat on share file %s (%s)\n", + fname, strerror(errno))); + sb.st_size = 1; + ret = False; + } + + /* If the file was zero length, we must delete before + doing the unlock to avoid a race condition (see + the code in lock_share_mode_entry for details. + */ + + /* remove the share file if zero length */ + if(sb.st_size == 0) + delete_share_file(cnum, fname); + + /* token is the fd of the open share mode file. */ + /* Unlock the first byte. */ + if(fcntl_lock(fd, F_SETLKW, 0, 1, F_UNLCK) == False) + { + DEBUG(0,("ERROR unlock_share_entry: fcntl_lock failed with %s\n", + strerror(errno))); + ret = False; + } + + close(fd); + return ret; +} + +/******************************************************************* +Read a share file into a buffer. +********************************************************************/ +static int read_share_file(int cnum, int fd, char *fname, char **out, BOOL *p_new_file) +{ + struct stat sb; + char *buf; + int size; + + *out = 0; + *p_new_file = False; + + if(fstat(fd, &sb) != 0) + { + DEBUG(0,("ERROR: read_share_file: Failed to do stat on share file %s (%s)\n", + fname, strerror(errno))); + return -1; + } + + if(sb.st_size == 0) + { + *p_new_file = True; + return 0; + } + + /* Allocate space for the file */ + if((buf = (char *)malloc(sb.st_size)) == NULL) + { + DEBUG(0,("read_share_file: malloc for file size %d fail !\n", sb.st_size)); + return -1; + } + + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: read_share_file: Failed to reset position to 0 \ +for share file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return -1; + } + + if (read(fd,buf,sb.st_size) != sb.st_size) + { + DEBUG(0,("ERROR: read_share_file: Failed to read share file %s (%s)\n", + fname, strerror(errno))); + if(buf) + free(buf); + return -1; + } + + if (IVAL(buf,SMF_VERSION_OFFSET) != LOCKING_VERSION) { + DEBUG(0,("ERROR: read_share_file: share file %s has incorrect \ +locking version (was %d, should be %d).\n",fname, + IVAL(buf,SMF_VERSION_OFFSET), LOCKING_VERSION)); + if(buf) + free(buf); + delete_share_file(cnum, fname); + return -1; + } + + /* Sanity check for file contents */ + size = sb.st_size; + size -= SMF_HEADER_LENGTH; /* Remove the header */ + + /* Remove the filename component. */ + size -= SVAL(buf, SMF_FILENAME_LEN_OFFSET); + + /* The remaining size must be a multiple of SMF_ENTRY_LENGTH - error if not. */ + if((size % SMF_ENTRY_LENGTH) != 0) + { + DEBUG(0,("ERROR: read_share_file: share file %s is an incorrect length - \ +deleting it.\n", fname)); + if(buf) + free(buf); + delete_share_file(cnum, fname); + return -1; + } + + *out = buf; + return 0; +} + +/******************************************************************* +get all share mode entries in a share file for a dev/inode pair. +********************************************************************/ +static int slow_get_share_modes(int cnum, int token, uint32 dev, uint32 inode, + share_mode_entry **old_shares) +{ + int fd = (int)token; + pstring fname; + int i; + int num_entries; + int num_entries_copied; + int newsize; + share_mode_entry *share_array; + char *buf = 0; + char *base = 0; + BOOL new_file; + + *old_shares = 0; + + /* Read the share file header - this is of the form: + 0 - locking version. + 4 - number of share mode entries. + 8 - 2 byte name length + [n bytes] file name (zero terminated). + + Followed by <n> share mode entries of the form : + + 0 - tv_sec + 4 - tv_usec + 8 - share_mode + 12 - pid + 16 - oplock port (if oplocks in use) - 2 bytes. + */ + + share_name(cnum, dev, inode, fname); + + if(read_share_file( cnum, fd, fname, &buf, &new_file) != 0) + { + DEBUG(0,("ERROR: get_share_modes: Failed to read share file %s\n", + fname)); + return 0; + } + + if(new_file == True) + return 0; + + num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); + + DEBUG(5,("get_share_modes: share file %s has %d share mode entries.\n", + fname, num_entries)); + + /* PARANOIA TEST */ + if(num_entries < 0) + { + DEBUG(0,("PANIC ERROR:get_share_mode: num_share_mode_entries < 0 (%d) \ +for share file %d\n", num_entries, fname)); + return 0; + } + + if(num_entries) + { + *old_shares = share_array = (share_mode_entry *) + malloc(num_entries * sizeof(share_mode_entry)); + if(*old_shares == 0) + { + DEBUG(0,("get_share_modes: malloc fail !\n")); + return 0; + } + } + else + { + /* No entries - just delete the file. */ + DEBUG(0,("get_share_modes: share file %s has no share mode entries - deleting.\n", + fname)); + if(buf) + free(buf); + delete_share_file(cnum, fname); + return 0; + } + + num_entries_copied = 0; + base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); + + for( i = 0; i < num_entries; i++) + { + int pid; + char *p = base + (i*SMF_ENTRY_LENGTH); + + pid = IVAL(p,SME_PID_OFFSET); + + if(!process_exists(pid)) + { + DEBUG(0,("get_share_modes: process %d no longer exists and \ +it left a share mode entry with mode 0x%X in share file %s\n", + pid, IVAL(p,SME_SHAREMODE_OFFSET), fname)); + continue; + } + share_array[num_entries_copied].time.tv_sec = IVAL(p,SME_SEC_OFFSET); + share_array[num_entries_copied].time.tv_usec = IVAL(p,SME_USEC_OFFSET); + share_array[num_entries_copied].share_mode = IVAL(p,SME_SHAREMODE_OFFSET); + share_array[num_entries_copied].pid = pid; + share_array[num_entries_copied].op_port = SVAL(p,SME_PORT_OFFSET); + share_array[num_entries_copied].op_type = SVAL(p,SME_OPLOCK_TYPE_OFFSET); + + num_entries_copied++; + } + + if(num_entries_copied == 0) + { + /* Delete the whole file. */ + DEBUG(0,("get_share_modes: share file %s had no valid entries - deleting it !\n", + fname)); + if(*old_shares) + free((char *)*old_shares); + *old_shares = 0; + if(buf) + free(buf); + delete_share_file(cnum, fname); + return 0; + } + + /* If we deleted some entries we need to re-write the whole number of + share mode entries back into the file. */ + + if(num_entries_copied != num_entries) + { + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: get_share_modes: lseek failed to reset to \ +position 0 for share mode file %s (%s)\n", fname, strerror(errno))); + if(*old_shares) + free((char *)*old_shares); + *old_shares = 0; + if(buf) + free(buf); + return 0; + } + + SIVAL(buf, SMF_NUM_ENTRIES_OFFSET, num_entries_copied); + for( i = 0; i < num_entries_copied; i++) + { + char *p = base + (i*SMF_ENTRY_LENGTH); + + SIVAL(p,SME_PID_OFFSET,share_array[i].pid); + SIVAL(p,SME_SHAREMODE_OFFSET,share_array[i].share_mode); + SIVAL(p,SME_SEC_OFFSET,share_array[i].time.tv_sec); + SIVAL(p,SME_USEC_OFFSET,share_array[i].time.tv_usec); + SSVAL(p,SME_PORT_OFFSET,share_array[i].op_port); + SSVAL(p,SME_OPLOCK_TYPE_OFFSET,share_array[i].op_type); + } + + newsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries_copied); + if(write(fd, buf, newsize) != newsize) + { + DEBUG(0,("ERROR: get_share_modes: failed to re-write share \ +mode file %s (%s)\n", fname, strerror(errno))); + if(*old_shares) + free((char *)*old_shares); + *old_shares = 0; + if(buf) + free(buf); + return 0; + } + /* Now truncate the file at this point. */ + if(ftruncate(fd, newsize)!= 0) + { + DEBUG(0,("ERROR: get_share_modes: failed to ftruncate share \ +mode file %s to size %d (%s)\n", fname, newsize, strerror(errno))); + if(*old_shares) + free((char *)*old_shares); + *old_shares = 0; + if(buf) + free(buf); + return 0; + } + } + + if(buf) + free(buf); + + DEBUG(5,("get_share_modes: Read share file %s returning %d entries\n",fname, + num_entries_copied)); + + return num_entries_copied; +} + +/******************************************************************* +del a share mode from a share mode file. +********************************************************************/ +static void slow_del_share_mode(int token, int fnum) +{ + pstring fname; + int fd = (int)token; + char *buf = 0; + char *base = 0; + int num_entries; + int newsize; + int i; + files_struct *fs_p = &Files[fnum]; + int pid; + BOOL deleted = False; + BOOL new_file; + + share_name(fs_p->cnum, fs_p->fd_ptr->dev, + fs_p->fd_ptr->inode, fname); + + if(read_share_file( fs_p->cnum, fd, fname, &buf, &new_file) != 0) + { + DEBUG(0,("ERROR: del_share_mode: Failed to read share file %s\n", + fname)); + return; + } + + if(new_file == True) + { + DEBUG(0,("ERROR:del_share_mode: share file %s is new (size zero), deleting it.\n", + fname)); + delete_share_file(fs_p->cnum, fname); + return; + } + + num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); + + DEBUG(5,("del_share_mode: share file %s has %d share mode entries.\n", + fname, num_entries)); + + /* PARANOIA TEST */ + if(num_entries < 0) + { + DEBUG(0,("PANIC ERROR:del_share_mode: num_share_mode_entries < 0 (%d) \ +for share file %d\n", num_entries, fname)); + return; + } + + if(num_entries == 0) + { + /* No entries - just delete the file. */ + DEBUG(0,("del_share_mode: share file %s has no share mode entries - deleting.\n", + fname)); + if(buf) + free(buf); + delete_share_file(fs_p->cnum, fname); + return; + } + + pid = getpid(); + + /* Go through the entries looking for the particular one + we have set - delete it. + */ + + base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); + + for(i = 0; i < num_entries; i++) + { + char *p = base + (i*SMF_ENTRY_LENGTH); + + if((IVAL(p,SME_SEC_OFFSET) != fs_p->open_time.tv_sec) || + (IVAL(p,SME_USEC_OFFSET) != fs_p->open_time.tv_usec) || + (IVAL(p,SME_SHAREMODE_OFFSET) != fs_p->share_mode) || + (IVAL(p,SME_PID_OFFSET) != pid)) + continue; + + DEBUG(5,("del_share_mode: deleting entry number %d (of %d) from the share file %s\n", + i, num_entries, fname)); + + /* Remove this entry. */ + if(i != num_entries - 1) + memcpy(p, p + SMF_ENTRY_LENGTH, (num_entries - i - 1)*SMF_ENTRY_LENGTH); + + deleted = True; + break; + } + + if(!deleted) + { + DEBUG(0,("del_share_mode: entry not found in share file %s\n", fname)); + if(buf) + free(buf); + return; + } + + num_entries--; + SIVAL(buf,SMF_NUM_ENTRIES_OFFSET, num_entries); + + if(num_entries == 0) + { + /* Deleted the last entry - remove the file. */ + DEBUG(5,("del_share_mode: removed last entry in share file - deleting share file %s\n", + fname)); + if(buf) + free(buf); + delete_share_file(fs_p->cnum,fname); + return; + } + + /* Re-write the file - and truncate it at the correct point. */ + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: del_share_mode: lseek failed to reset to \ +position 0 for share mode file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return; + } + + newsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries); + if(write(fd, buf, newsize) != newsize) + { + DEBUG(0,("ERROR: del_share_mode: failed to re-write share \ +mode file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return; + } + /* Now truncate the file at this point. */ + if(ftruncate(fd, newsize) != 0) + { + DEBUG(0,("ERROR: del_share_mode: failed to ftruncate share \ +mode file %s to size %d (%s)\n", fname, newsize, strerror(errno))); + if(buf) + free(buf); + return; + } +} + +/******************************************************************* +set the share mode of a file +********************************************************************/ +static BOOL slow_set_share_mode(int token,int fnum, uint16 port, uint16 op_type) +{ + files_struct *fs_p = &Files[fnum]; + pstring fname; + int fd = (int)token; + int pid = (int)getpid(); + struct stat sb; + char *buf; + int num_entries; + int header_size; + char *p; + + share_name(fs_p->cnum, fs_p->fd_ptr->dev, + fs_p->fd_ptr->inode, fname); + + if(fstat(fd, &sb) != 0) + { + DEBUG(0,("ERROR: set_share_mode: Failed to do stat on share file %s\n", + fname)); + return False; + } + + /* Sanity check for file contents (if it's not a new share file). */ + if(sb.st_size != 0) + { + int size = sb.st_size; + + /* Allocate space for the file plus one extra entry */ + if((buf = (char *)malloc(sb.st_size + SMF_ENTRY_LENGTH)) == NULL) + { + DEBUG(0,("set_share_mode: malloc for file size %d fail !\n", + sb.st_size + SMF_ENTRY_LENGTH)); + return False; + } + + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: set_share_mode: Failed to reset position \ +to 0 for share file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return False; + } + + if (read(fd,buf,sb.st_size) != sb.st_size) + { + DEBUG(0,("ERROR: set_share_mode: Failed to read share file %s (%s)\n", + fname, strerror(errno))); + if(buf) + free(buf); + return False; + } + + if (IVAL(buf,SMF_VERSION_OFFSET) != LOCKING_VERSION) + { + DEBUG(0,("ERROR: set_share_mode: share file %s has incorrect \ +locking version (was %d, should be %d).\n",fname, IVAL(buf,SMF_VERSION_OFFSET), + LOCKING_VERSION)); + if(buf) + free(buf); + delete_share_file(fs_p->cnum, fname); + return False; + } + + size -= (SMF_HEADER_LENGTH + SVAL(buf, SMF_FILENAME_LEN_OFFSET)); /* Remove the header */ + + /* The remaining size must be a multiple of SMF_ENTRY_LENGTH - error if not. */ + if((size % SMF_ENTRY_LENGTH) != 0) + { + DEBUG(0,("ERROR: set_share_mode: share file %s is an incorrect length - \ +deleting it.\n", fname)); + if(buf) + free(buf); + delete_share_file(fs_p->cnum, fname); + return False; + } + + } + else + { + /* New file - just use a single_entry. */ + if((buf = (char *)malloc(SMF_HEADER_LENGTH + + strlen(fs_p->name) + 1 + SMF_ENTRY_LENGTH)) == NULL) + { + DEBUG(0,("ERROR: set_share_mode: malloc failed for single entry.\n")); + return False; + } + SIVAL(buf,SMF_VERSION_OFFSET,LOCKING_VERSION); + SIVAL(buf,SMF_NUM_ENTRIES_OFFSET,0); + SSVAL(buf,SMF_FILENAME_LEN_OFFSET,strlen(fs_p->name) + 1); + strcpy(buf + SMF_HEADER_LENGTH, fs_p->name); + } + + num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); + header_size = SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); + p = buf + header_size + (num_entries * SMF_ENTRY_LENGTH); + SIVAL(p,SME_SEC_OFFSET,fs_p->open_time.tv_sec); + SIVAL(p,SME_USEC_OFFSET,fs_p->open_time.tv_usec); + SIVAL(p,SME_SHAREMODE_OFFSET,fs_p->share_mode); + SIVAL(p,SME_PID_OFFSET,pid); + SSVAL(p,SME_PORT_OFFSET,port); + SSVAL(p,SME_OPLOCK_TYPE_OFFSET,op_type); + + num_entries++; + + SIVAL(buf,SMF_NUM_ENTRIES_OFFSET,num_entries); + + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: set_share_mode: (1) Failed to reset position to \ +0 for share file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return False; + } + + if (write(fd,buf,header_size + (num_entries*SMF_ENTRY_LENGTH)) != + (header_size + (num_entries*SMF_ENTRY_LENGTH))) + { + DEBUG(2,("ERROR: set_share_mode: Failed to write share file %s - \ +deleting it (%s).\n",fname, strerror(errno))); + delete_share_file(fs_p->cnum, fname); + if(buf) + free(buf); + return False; + } + + /* Now truncate the file at this point - just for safety. */ + if(ftruncate(fd, header_size + (SMF_ENTRY_LENGTH*num_entries))!= 0) + { + DEBUG(0,("ERROR: set_share_mode: failed to ftruncate share \ +mode file %s to size %d (%s)\n", fname, header_size + (SMF_ENTRY_LENGTH*num_entries), + strerror(errno))); + if(buf) + free(buf); + return False; + } + + if(buf) + free(buf); + + DEBUG(3,("set_share_mode: Created share file %s with \ +mode 0x%X pid=%d\n",fname,fs_p->share_mode,pid)); + + return True; +} + +/******************************************************************* +Remove an oplock port and mode entry from a share mode. +********************************************************************/ +static BOOL slow_remove_share_oplock(int fnum, int token) +{ + pstring fname; + int fd = (int)token; + char *buf = 0; + char *base = 0; + int num_entries; + int fsize; + int i; + files_struct *fs_p = &Files[fnum]; + int pid; + BOOL found = False; + BOOL new_file; + + share_name(fs_p->cnum, fs_p->fd_ptr->dev, + fs_p->fd_ptr->inode, fname); + + if(read_share_file( fs_p->cnum, fd, fname, &buf, &new_file) != 0) + { + DEBUG(0,("ERROR: remove_share_oplock: Failed to read share file %s\n", + fname)); + return False; + } + + if(new_file == True) + { + DEBUG(0,("ERROR: remove_share_oplock: share file %s is new (size zero), \ +deleting it.\n", fname)); + delete_share_file(fs_p->cnum, fname); + return False; + } + + num_entries = IVAL(buf,SMF_NUM_ENTRIES_OFFSET); + + DEBUG(5,("remove_share_oplock: share file %s has %d share mode entries.\n", + fname, num_entries)); + + /* PARANOIA TEST */ + if(num_entries < 0) + { + DEBUG(0,("PANIC ERROR:remove_share_oplock: num_share_mode_entries < 0 (%d) \ +for share file %d\n", num_entries, fname)); + return False; + } + + if(num_entries == 0) + { + /* No entries - just delete the file. */ + DEBUG(0,("remove_share_oplock: share file %s has no share mode entries - deleting.\n", + fname)); + if(buf) + free(buf); + delete_share_file(fs_p->cnum, fname); + return False; + } + + pid = getpid(); + + /* Go through the entries looking for the particular one + we have set - remove the oplock settings on it. + */ + + base = buf + SMF_HEADER_LENGTH + SVAL(buf,SMF_FILENAME_LEN_OFFSET); + + for(i = 0; i < num_entries; i++) + { + char *p = base + (i*SMF_ENTRY_LENGTH); + + if((IVAL(p,SME_SEC_OFFSET) != fs_p->open_time.tv_sec) || + (IVAL(p,SME_USEC_OFFSET) != fs_p->open_time.tv_usec) || + (IVAL(p,SME_SHAREMODE_OFFSET) != fs_p->share_mode) || + (IVAL(p,SME_PID_OFFSET) != pid)) + continue; + + DEBUG(5,("remove_share_oplock: clearing oplock on entry number %d (of %d) \ +from the share file %s\n", i, num_entries, fname)); + + SSVAL(p,SME_PORT_OFFSET,0); + SSVAL(p,SME_OPLOCK_TYPE_OFFSET,0); + found = True; + break; + } + + if(!found) + { + DEBUG(0,("remove_share_oplock: entry not found in share file %s\n", fname)); + if(buf) + free(buf); + return False; + } + + /* Re-write the file - and truncate it at the correct point. */ + if(lseek(fd, 0, SEEK_SET) != 0) + { + DEBUG(0,("ERROR: remove_share_oplock: lseek failed to reset to \ +position 0 for share mode file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return False; + } + + fsize = (base - buf) + (SMF_ENTRY_LENGTH*num_entries); + if(write(fd, buf, fsize) != fsize) + { + DEBUG(0,("ERROR: remove_share_oplock: failed to re-write share \ +mode file %s (%s)\n", fname, strerror(errno))); + if(buf) + free(buf); + return False; + } + + return True; +} + + + +/******************************************************************* +call the specified function on each entry under management by the +share ode system +********************************************************************/ +static int slow_share_forall(void (*fn)(share_mode_entry *, char *)) +{ + int i, count=0; + void *dir; + char *s; + share_mode_entry e; + + dir = opendir(lp_lockdir()); + if (!dir) { + return(0); + } + + while ((s=readdirname(dir))) { + char *buf; + char *base; + int fd; + pstring lname; + uint32 dev,inode; + BOOL new_file; + pstring fname; + + if (sscanf(s,"share.%u.%u",&dev,&inode)!=2) continue; + + strcpy(lname,lp_lockdir()); + trim_string(lname,NULL,"/"); + strcat(lname,"/"); + strcat(lname,s); + + fd = open(lname,O_RDWR,0); + if (fd < 0) { + continue; + } + + /* Lock the share mode file while we read it. */ + if(fcntl_lock(fd, F_SETLKW, 0, 1, F_WRLCK) == False) { + close(fd); + continue; + } + + if(read_share_file( 0, fd, lname, &buf, &new_file)) { + close(fd); + continue; + } + strcpy( fname, &buf[10]); + close(fd); + + base = buf + SMF_HEADER_LENGTH + + SVAL(buf,SMF_FILENAME_LEN_OFFSET); + for( i = 0; i < IVAL(buf, SMF_NUM_ENTRIES_OFFSET); i++) { + char *p = base + (i*SMF_ENTRY_LENGTH); + e.pid = IVAL(p,SME_PID_OFFSET); + e.share_mode = IVAL(p,SME_SHAREMODE_OFFSET); + e.time.tv_sec = IVAL(p,SME_SEC_OFFSET); + e.time.tv_usec = IVAL(p,SME_USEC_OFFSET); + e.op_port = SVAL(p,SME_PORT_OFFSET); + e.pid = SVAL(p,SME_PID_OFFSET); + e.op_type = SVAL(p,SME_OPLOCK_TYPE_OFFSET); + + fn(&e, fname); + count++; + } /* end for i */ + + if(buf) + free(buf); + base = 0; + } /* end while */ + closedir(dir); + + return count; +} + + +/******************************************************************* +dump the state of the system +********************************************************************/ +static void slow_share_status(FILE *f) +{ + +} + + +static struct share_ops share_ops = { + slow_stop_share_mode_mgmt, + slow_lock_share_entry, + slow_unlock_share_entry, + slow_get_share_modes, + slow_del_share_mode, + slow_set_share_mode, + slow_remove_share_oplock, + slow_share_forall, + slow_share_status, +}; + +/******************************************************************* + initialize the slow share_mode management + ******************************************************************/ +struct share_ops *locking_slow_init(void) +{ + if (!directory_exist(lp_lockdir(),NULL)) { + mkdir(lp_lockdir(),0755); + if (!directory_exist(lp_lockdir(),NULL)) + return NULL; + } + + return &share_ops; +} |