2 Unix SMB/Netbios implementation.
4 file opening and share modes
5 Copyright (C) Andrew Tridgell 1992-1998
6 Copyright (C) Jeremy Allison 2001
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 extern userdom_struct current_user_info;
26 extern uint16 global_oplock_port;
27 extern BOOL global_client_failed_oplock_break;
29 /****************************************************************************
30 fd support routines - attempt to do a dos_open.
31 ****************************************************************************/
33 static int fd_open(struct connection_struct *conn, char *fname,
34 int flags, mode_t mode)
40 fd = conn->vfs_ops.open(conn,fname,flags,mode);
42 /* Fix for files ending in '.' */
43 if((fd == -1) && (errno == ENOENT) &&
44 (strchr_m(fname,'.')==NULL)) {
46 fd = conn->vfs_ops.open(conn,fname,flags,mode);
49 DEBUG(10,("fd_open: name %s, flags = 0%o mode = 0%o, fd = %d. %s\n", fname,
50 flags, (int)mode, fd, (fd == -1) ? strerror(errno) : "" ));
55 /****************************************************************************
56 Close the file associated with a fsp.
57 ****************************************************************************/
59 int fd_close(struct connection_struct *conn, files_struct *fsp)
63 return fd_close_posix(conn, fsp);
67 /****************************************************************************
68 Check a filename for the pipe string.
69 ****************************************************************************/
71 static void check_for_pipe(char *fname)
73 /* special case of pipe opens */
75 StrnCpy(s,fname,sizeof(s)-1);
77 if (strstr(s,"pipe/")) {
78 DEBUG(3,("Rejecting named pipe open for %s\n",fname));
79 unix_ERR_class = ERRSRV;
80 unix_ERR_code = ERRaccess;
84 /****************************************************************************
86 ****************************************************************************/
88 static BOOL open_file(files_struct *fsp,connection_struct *conn,
89 char *fname1,SMB_STRUCT_STAT *psbuf,int flags,mode_t mode)
91 extern struct current_user current_user;
93 int accmode = (flags & O_ACCMODE);
94 int local_flags = flags;
97 fsp->oplock_type = NO_OPLOCK;
100 pstrcpy(fname,fname1);
102 /* Check permissions */
105 * This code was changed after seeing a client open request
106 * containing the open mode of (DENY_WRITE/read-only) with
107 * the 'create if not exist' bit set. The previous code
108 * would fail to open the file read only on a read-only share
109 * as it was checking the flags parameter directly against O_RDONLY,
110 * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
114 if (!CAN_WRITE(conn)) {
115 /* It's a read-only share - fail if we wanted to write. */
116 if(accmode != O_RDONLY) {
117 DEBUG(3,("Permission denied opening %s\n",fname));
118 check_for_pipe(fname);
120 } else if(flags & O_CREAT) {
121 /* We don't want to write - but we must make sure that O_CREAT
122 doesn't create the file if we have write access into the
130 * This little piece of insanity is inspired by the
131 * fact that an NT client can open a file for O_RDONLY,
132 * but set the create disposition to FILE_EXISTS_TRUNCATE.
133 * If the client *can* write to the file, then it expects to
134 * truncate the file, even though it is opening for readonly.
135 * Quicken uses this stupid trick in backup file creation...
136 * Thanks *greatly* to "David W. Chapman Jr." <dwcjr@inethouston.net>
137 * for helping track this one down. It didn't bite us in 2.0.x
138 * as we always opened files read-write in that release. JRA.
141 if ((accmode == O_RDONLY) && ((flags & O_TRUNC) == O_TRUNC))
142 local_flags = (flags & ~O_ACCMODE)|O_RDWR;
145 * We can't actually truncate here as the file may be locked.
146 * open_file_shared will take care of the truncate later. JRA.
149 local_flags &= ~O_TRUNC;
151 /* actually do the open */
152 fsp->fd = fd_open(conn, fname, local_flags, mode);
155 DEBUG(3,("Error opening file %s (%s) (local_flags=%d) (flags=%d)\n",
156 fname,strerror(errno),local_flags,flags));
157 check_for_pipe(fname);
161 if (!VALID_STAT(*psbuf)) {
162 if (vfs_fstat(fsp,fsp->fd,psbuf) == -1) {
163 DEBUG(0,("Error doing fstat on open file %s (%s)\n", fname,strerror(errno) ));
170 * POSIX allows read-only opens of directories. We don't
171 * want to do this (we use a different code path for this)
172 * so catch a directory open and return an EISDIR. JRA.
175 if(S_ISDIR(psbuf->st_mode)) {
181 fsp->mode = psbuf->st_mode;
182 fsp->inode = psbuf->st_ino;
183 fsp->dev = psbuf->st_dev;
184 fsp->vuid = current_user.vuid;
185 fsp->size = psbuf->st_size;
187 fsp->can_lock = True;
188 fsp->can_read = ((flags & O_WRONLY)==0);
189 fsp->can_write = ((flags & (O_WRONLY|O_RDWR))!=0);
191 fsp->print_file = False;
192 fsp->modified = False;
193 fsp->oplock_type = NO_OPLOCK;
194 fsp->sent_oplock_break = NO_BREAK_SENT;
195 fsp->is_directory = False;
196 fsp->stat_open = False;
197 fsp->directory_delete_on_close = False;
199 string_set(&fsp->fsp_name,fname);
200 fsp->wcp = NULL; /* Write cache pointer. */
202 DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
203 *current_user_info.smb_name ? current_user_info.smb_name : conn->user,fsp->fsp_name,
204 BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
205 conn->num_files_open + 1));
208 * Take care of inherited ACLs on created files. JRA.
211 if ((flags & O_CREAT) && (conn->vfs_ops.fchmod_acl != NULL)) {
212 int saved_errno = errno; /* We might get ENOSYS in the next call.. */
213 if (conn->vfs_ops.fchmod_acl(fsp, fsp->fd, mode) == -1 && errno == ENOSYS)
214 errno = saved_errno; /* Ignore ENOSYS */
220 /****************************************************************************
222 Helper for open_file_shared.
223 Truncate a file after checking locking; close file if locked.
224 **************************************************************************/
226 static int truncate_unless_locked(struct connection_struct *conn, files_struct *fsp)
228 SMB_BIG_UINT mask = (SMB_BIG_UINT)-1;
230 if (is_locked(fsp,fsp->conn,mask,0,WRITE_LOCK,True)){
232 unix_ERR_class = ERRDOS;
233 unix_ERR_code = ERRlock;
236 return conn->vfs_ops.ftruncate(fsp,fsp->fd,0);
240 /*******************************************************************
241 return True if the filename is one of the special executable types
242 ********************************************************************/
243 static BOOL is_executable(const char *fname)
245 if ((fname = strrchr_m(fname,'.'))) {
246 if (strequal(fname,".com") ||
247 strequal(fname,".dll") ||
248 strequal(fname,".exe") ||
249 strequal(fname,".sym")) {
256 enum {AFAIL,AREAD,AWRITE,AALL};
258 /*******************************************************************
259 reproduce the share mode access table
260 this is horrendoously complex, and really can't be justified on any
261 rational grounds except that this is _exactly_ what NT does. See
262 the DENY1 and DENY2 tests in smbtorture for a comprehensive set of
264 ********************************************************************/
265 static int access_table(int new_deny,int old_deny,int old_mode,
266 BOOL same_pid, BOOL isexe)
268 if (new_deny == DENY_ALL || old_deny == DENY_ALL) return(AFAIL);
271 if (isexe && old_mode == DOS_OPEN_RDONLY &&
272 old_deny == DENY_DOS && new_deny == DENY_READ) {
275 if (!isexe && old_mode == DOS_OPEN_RDONLY &&
276 old_deny == DENY_DOS && new_deny == DENY_DOS) {
279 if (new_deny == DENY_FCB && old_deny == DENY_DOS) {
280 if (isexe) return AFAIL;
281 if (old_mode == DOS_OPEN_RDONLY) return AFAIL;
284 if (old_mode == DOS_OPEN_RDONLY && old_deny == DENY_DOS) {
285 if (new_deny == DENY_FCB || new_deny == DENY_READ) {
286 if (isexe) return AREAD;
290 if (old_deny == DENY_FCB) {
291 if (new_deny == DENY_DOS || new_deny == DENY_FCB) return AALL;
296 if (old_deny == DENY_DOS || new_deny == DENY_DOS ||
297 old_deny == DENY_FCB || new_deny == DENY_FCB) {
299 if (old_deny == DENY_FCB || new_deny == DENY_FCB) {
302 if (old_deny == DENY_DOS) {
303 if (new_deny == DENY_READ &&
304 (old_mode == DOS_OPEN_RDONLY ||
305 old_mode == DOS_OPEN_RDWR)) {
308 if (new_deny == DENY_WRITE &&
309 (old_mode == DOS_OPEN_WRONLY ||
310 old_mode == DOS_OPEN_RDWR)) {
315 if (old_deny == DENY_NONE) return AALL;
316 if (old_deny == DENY_READ) return AWRITE;
317 if (old_deny == DENY_WRITE) return AREAD;
319 /* it isn't a exe, dll, sym or com file */
320 if (old_deny == new_deny && same_pid)
323 if (old_deny == DENY_READ || new_deny == DENY_READ) return AFAIL;
324 if (old_mode == DOS_OPEN_RDONLY) return(AREAD);
332 if (old_deny==DENY_WRITE && old_mode==DOS_OPEN_RDONLY) return(AREAD);
333 if (old_deny==DENY_READ && old_mode==DOS_OPEN_RDONLY) return(AWRITE);
334 if (old_deny==DENY_NONE && old_mode==DOS_OPEN_RDONLY) return(AALL);
337 if (old_deny==DENY_WRITE && old_mode==DOS_OPEN_WRONLY) return(AREAD);
338 if (old_deny==DENY_READ && old_mode==DOS_OPEN_WRONLY) return(AWRITE);
339 if (old_deny==DENY_NONE && old_mode==DOS_OPEN_WRONLY) return(AALL);
342 if (old_deny==DENY_WRITE) return(AREAD);
343 if (old_deny==DENY_READ) return(AWRITE);
344 if (old_deny==DENY_NONE) return(AALL);
351 /****************************************************************************
352 check if we can open a file with a share mode
353 ****************************************************************************/
355 static BOOL check_share_mode(connection_struct *conn, share_mode_entry *share, int share_mode,
356 const char *fname, BOOL fcbopen, int *flags)
358 int deny_mode = GET_DENY_MODE(share_mode);
359 int old_open_mode = GET_OPEN_MODE(share->share_mode);
360 int old_deny_mode = GET_DENY_MODE(share->share_mode);
363 * share modes = false means don't bother to check for
364 * DENY mode conflict. This is a *really* bad idea :-). JRA.
367 if(!lp_share_modes(SNUM(conn)))
371 * Don't allow any opens once the delete on close flag has been
375 if (GET_DELETE_ON_CLOSE_FLAG(share->share_mode)) {
376 DEBUG(5,("check_share_mode: Failing open on file %s as delete on close flag is set.\n",
378 unix_ERR_class = ERRDOS;
379 unix_ERR_code = ERRnoaccess;
384 * If delete access was requested and the existing share mode doesn't have
385 * ALLOW_SHARE_DELETE then deny.
388 if (GET_DELETE_ACCESS_REQUESTED(share_mode) && !GET_ALLOW_SHARE_DELETE(share->share_mode)) {
389 DEBUG(5,("check_share_mode: Failing open on file %s as delete access requested and allow share delete not set.\n",
391 unix_ERR_class = ERRDOS;
392 unix_ERR_code = ERRbadshare;
398 * The inverse of the above.
399 * If delete access was granted and the new share mode doesn't have
400 * ALLOW_SHARE_DELETE then deny.
403 if (GET_DELETE_ACCESS_REQUESTED(share->share_mode) && !GET_ALLOW_SHARE_DELETE(share_mode)) {
404 DEBUG(5,("check_share_mode: Failing open on file %s as delete access granted and allow share delete not requested.\n",
406 unix_ERR_class = ERRDOS;
407 unix_ERR_code = ERRbadshare;
413 int access_allowed = access_table(deny_mode,old_deny_mode,old_open_mode,
414 (share->pid == sys_getpid()),is_executable(fname));
416 if ((access_allowed == AFAIL) ||
417 (!fcbopen && (access_allowed == AREAD && *flags == O_RDWR)) ||
418 (access_allowed == AREAD && *flags != O_RDONLY) ||
419 (access_allowed == AWRITE && *flags != O_WRONLY)) {
421 DEBUG(2,("Share violation on file (%d,%d,%d,%d,%s,fcbopen = %d, flags = %d) = %d\n",
422 deny_mode,old_deny_mode,old_open_mode,
423 (int)share->pid,fname, fcbopen, *flags, access_allowed));
425 unix_ERR_class = ERRDOS;
426 unix_ERR_code = ERRbadshare;
431 if (access_allowed == AREAD)
434 if (access_allowed == AWRITE)
442 /****************************************************************************
443 Deal with open deny mode and oplock break processing.
444 Invarient: Share mode must be locked on entry and exit.
445 Returns -1 on error, or number of share modes on success (may be zero).
446 ****************************************************************************/
448 static int open_mode_check(connection_struct *conn, const char *fname, SMB_DEV_T dev,
449 SMB_INO_T inode, int share_mode, int *p_flags, int *p_oplock_request,
450 BOOL *p_all_current_opens_are_level_II)
454 int oplock_contention_count = 0;
455 share_mode_entry *old_shares = 0;
456 BOOL fcbopen = False;
459 if(GET_OPEN_MODE(share_mode) == DOS_OPEN_FCB)
462 num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
464 if(num_share_modes == 0)
468 * Check if the share modes will give us access.
472 share_mode_entry broken_entry;
474 broke_oplock = False;
475 *p_all_current_opens_are_level_II = True;
477 for(i = 0; i < num_share_modes; i++) {
478 share_mode_entry *share_entry = &old_shares[i];
481 * By observation of NetBench, oplocks are broken *before* share
482 * modes are checked. This allows a file to be closed by the client
483 * if the share mode would deny access and the client has an oplock.
484 * Check if someone has an oplock on this file. If so we must break
485 * it before continuing.
488 if((*p_oplock_request && EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) ||
489 (!*p_oplock_request && (share_entry->op_type != NO_OPLOCK))) {
493 DEBUG(5,("open_mode_check: oplock_request = %d, breaking oplock (%x) on file %s, \
494 dev = %x, inode = %.0f\n", *p_oplock_request, share_entry->op_type, fname, (unsigned int)dev, (double)inode));
496 /* Oplock break - unlock to request it. */
497 unlock_share_entry(conn, dev, inode);
499 opb_ret = request_oplock_break(share_entry);
502 lock_share_entry(conn, dev, inode);
504 if(opb_ret == False) {
505 DEBUG(0,("open_mode_check: FAILED when breaking oplock (%x) on file %s, \
506 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
507 SAFE_FREE(old_shares);
509 unix_ERR_class = ERRDOS;
510 unix_ERR_code = ERRbadshare;
515 broken_entry = *share_entry;
518 } else if (!LEVEL_II_OPLOCK_TYPE(share_entry->op_type)) {
519 *p_all_current_opens_are_level_II = False;
522 /* someone else has a share lock on it, check to see
525 if(check_share_mode(conn, share_entry, share_mode, fname, fcbopen, p_flags) == False) {
526 SAFE_FREE(old_shares);
534 SAFE_FREE(old_shares);
535 num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
536 oplock_contention_count++;
538 /* Paranoia check that this is no longer an exlusive entry. */
539 for(i = 0; i < num_share_modes; i++) {
540 share_mode_entry *share_entry = &old_shares[i];
542 if (share_modes_identical(&broken_entry, share_entry) &&
543 EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type) ) {
546 * This should not happen. The target left this oplock
547 * as exlusive.... The process *must* be dead....
550 DEBUG(0,("open_mode_check: exlusive oplock left by process %d after break ! For file %s, \
551 dev = %x, inode = %.0f. Deleting it to continue...\n", (int)broken_entry.pid, fname, (unsigned int)dev, (double)inode));
553 if (process_exists(broken_entry.pid)) {
554 DEBUG(0,("open_mode_check: Existant process %d left active oplock.\n",
558 if (del_share_entry(dev, inode, &broken_entry, NULL) == -1) {
560 unix_ERR_class = ERRDOS;
561 unix_ERR_code = ERRbadshare;
566 * We must reload the share modes after deleting the
567 * other process's entry.
570 SAFE_FREE(old_shares);
571 num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
574 } /* end for paranoia... */
575 } /* end if broke_oplock */
577 } while(broke_oplock);
580 SAFE_FREE(old_shares);
583 * Refuse to grant an oplock in case the contention limit is
584 * reached when going through the lock list multiple times.
587 if(oplock_contention_count >= lp_oplock_contention_limit(SNUM(conn))) {
588 *p_oplock_request = 0;
589 DEBUG(4,("open_mode_check: oplock contention = %d. Not granting oplock.\n",
590 oplock_contention_count ));
593 return num_share_modes;
596 /****************************************************************************
597 set a kernel flock on a file for NFS interoperability
598 this requires a patch to Linux
599 ****************************************************************************/
600 static void kernel_flock(files_struct *fsp, int deny_mode)
602 #if HAVE_KERNEL_SHARE_MODES
604 if (deny_mode == DENY_READ) kernel_mode = LOCK_MAND|LOCK_WRITE;
605 else if (deny_mode == DENY_WRITE) kernel_mode = LOCK_MAND|LOCK_READ;
606 else if (deny_mode == DENY_ALL) kernel_mode = LOCK_MAND;
607 if (kernel_mode) flock(fsp->fd, kernel_mode);
613 /****************************************************************************
614 Open a file with a share mode. On output from this open we are guarenteeing
616 ****************************************************************************/
617 files_struct *open_file_shared(connection_struct *conn,char *fname, SMB_STRUCT_STAT *psbuf,
618 int share_mode,int ofun, mode_t mode,int oplock_request,
619 int *Access,int *action)
623 int deny_mode = GET_DENY_MODE(share_mode);
624 BOOL allow_share_delete = GET_ALLOW_SHARE_DELETE(share_mode);
625 BOOL delete_access_requested = GET_DELETE_ACCESS_REQUESTED(share_mode);
626 BOOL delete_on_close = GET_DELETE_ON_CLOSE_FLAG(share_mode);
627 BOOL file_existed = VALID_STAT(*psbuf);
628 BOOL fcbopen = False;
631 int num_share_modes = 0;
632 BOOL all_current_opens_are_level_II = False;
633 BOOL fsp_open = False;
634 files_struct *fsp = NULL;
639 /* printers are handled completely differently. Most of the passed parameters are
641 *Access = DOS_OPEN_WRONLY;
642 *action = FILE_WAS_CREATED;
643 return print_fsp_open(conn);
646 fsp = file_new(conn);
650 DEBUG(10,("open_file_shared: fname = %s, share_mode = %x, ofun = %x, mode = %o, oplock request = %d\n",
651 fname, share_mode, ofun, (int)mode, oplock_request ));
653 if (!check_name(fname,conn)) {
658 /* ignore any oplock requests if oplocks are disabled */
659 if (!lp_oplocks(SNUM(conn)) || global_client_failed_oplock_break) {
663 /* this is for OS/2 EAs - try and say we don't support them */
664 if (strstr(fname,".+,;=[].")) {
665 unix_ERR_class = ERRDOS;
666 /* OS/2 Workplace shell fix may be main code stream in a later release. */
667 #if 1 /* OS2_WPS_FIX - Recent versions of OS/2 need this. */
668 unix_ERR_code = ERRcannotopen;
669 #else /* OS2_WPS_FIX */
670 unix_ERR_code = ERROR_EAS_NOT_SUPPORTED;
671 #endif /* OS2_WPS_FIX */
673 DEBUG(5,("open_file_shared: OS/2 EA's are not supported.\n"));
678 if ((GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_FAIL) && file_existed) {
679 DEBUG(5,("open_file_shared: create new requested for file %s and file already exists.\n",
686 if (GET_FILE_CREATE_DISPOSITION(ofun) == FILE_CREATE_IF_NOT_EXIST)
689 if (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_TRUNCATE)
692 if (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_FAIL)
695 /* note that we ignore the append flag as
696 append does not mean the same thing under dos and unix */
698 switch (GET_OPEN_MODE(share_mode)) {
699 case DOS_OPEN_WRONLY:
715 if (GET_FILE_SYNC_OPENMODE(share_mode)) {
720 if (flags != O_RDONLY && file_existed &&
721 (!CAN_WRITE(conn) || IS_DOS_READONLY(dos_mode(conn,fname,psbuf)))) {
723 DEBUG(5,("open_file_shared: read/write access requested for file %s on read only %s\n",
724 fname, !CAN_WRITE(conn) ? "share" : "file" ));
732 if (deny_mode > DENY_NONE && deny_mode!=DENY_FCB) {
733 DEBUG(2,("Invalid deny mode %d on file %s\n",deny_mode,fname));
742 inode = psbuf->st_ino;
744 lock_share_entry(conn, dev, inode);
746 num_share_modes = open_mode_check(conn, fname, dev, inode, share_mode,
747 &flags, &oplock_request, &all_current_opens_are_level_II);
748 if(num_share_modes == -1) {
751 * This next line is a subtlety we need for MS-Access. If a file open will
752 * fail due to share permissions and also for security (access)
753 * reasons, we need to return the access failed error, not the
754 * share error. This means we must attempt to open the file anyway
755 * in order to get the UNIX access error - even if we're going to
756 * fail the open for share reasons. This is bad, as we're burning
757 * another fd if there are existing locks but there's nothing else
758 * we can do. We also ensure we're not going to create or tuncate
759 * the file as we only want an access decision at this stage. JRA.
761 fsp_open = open_file(fsp,conn,fname,psbuf,flags|(flags2&~(O_TRUNC|O_CREAT)),mode);
763 DEBUG(4,("open_file_shared : share_mode deny - calling open_file with \
764 flags=0x%X flags2=0x%X mode=0%o returned %d\n",
765 flags,(flags2&~(O_TRUNC|O_CREAT)),(int)mode,(int)fsp_open ));
767 unlock_share_entry(conn, dev, inode);
775 * We exit this block with the share entry *locked*.....
779 DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o\n",
780 flags,flags2,(int)mode));
783 * open_file strips any O_TRUNC flags itself.
786 fsp_open = open_file(fsp,conn,fname,psbuf,flags|flags2,mode);
788 if (!fsp_open && (flags == O_RDWR) && (errno != ENOENT) && fcbopen) {
789 if((fsp_open = open_file(fsp,conn,fname,psbuf,O_RDONLY,mode)) == True)
795 unlock_share_entry(conn, dev, inode);
801 * Deal with the race condition where two smbd's detect the file doesn't
802 * exist and do the create at the same time. One of them will win and
803 * set a share mode, the other (ie. this one) should check if the
804 * requested share mode for this create is allowed.
809 lock_share_entry_fsp(fsp);
811 num_share_modes = open_mode_check(conn, fname, dev, inode, share_mode,
812 &flags, &oplock_request, &all_current_opens_are_level_II);
814 if(num_share_modes == -1) {
815 unlock_share_entry_fsp(fsp);
822 * If there are any share modes set then the file *did*
823 * exist. Ensure we return the correct value for action.
826 if (num_share_modes > 0)
830 * We exit this block with the share entry *locked*.....
834 /* note that we ignore failure for the following. It is
835 basically a hack for NFS, and NFS will never set one of
836 these only read them. Nobody but Samba can ever set a deny
837 mode and we have already checked our more authoritative
838 locking database for permission to set this deny mode. If
839 the kernel refuses the operations then the kernel is wrong */
840 kernel_flock(fsp, deny_mode);
843 * At this point onwards, we can guarentee that the share entry
844 * is locked, whether we created the file or not, and that the
845 * deny mode is compatible with all current opens.
849 * If requested, truncate the file.
852 if (flags2&O_TRUNC) {
854 * We are modifing the file after open - update the stat struct..
856 if ((truncate_unless_locked(conn,fsp) == -1) || (vfs_fstat(fsp,fsp->fd,psbuf)==-1)) {
857 unlock_share_entry_fsp(fsp);
866 open_mode = DOS_OPEN_RDONLY;
869 open_mode = DOS_OPEN_RDWR;
872 open_mode = DOS_OPEN_WRONLY;
876 fsp->share_mode = SET_DENY_MODE(deny_mode) |
877 SET_OPEN_MODE(open_mode) |
878 SET_ALLOW_SHARE_DELETE(allow_share_delete) |
879 SET_DELETE_ACCESS_REQUESTED(delete_access_requested);
881 DEBUG(10,("open_file_shared : share_mode = %x\n", fsp->share_mode ));
884 (*Access) = open_mode;
887 if (file_existed && !(flags2 & O_TRUNC))
888 *action = FILE_WAS_OPENED;
890 *action = FILE_WAS_CREATED;
891 if (file_existed && (flags2 & O_TRUNC))
892 *action = FILE_WAS_OVERWRITTEN;
896 * Setup the oplock info in both the shared memory and
900 if(oplock_request && (num_share_modes == 0) &&
901 !IS_VETO_OPLOCK_PATH(conn,fname) && set_file_oplock(fsp, oplock_request) ) {
902 port = global_oplock_port;
903 } else if (oplock_request && all_current_opens_are_level_II) {
904 port = global_oplock_port;
905 oplock_request = LEVEL_II_OPLOCK;
906 set_file_oplock(fsp, oplock_request);
912 set_share_mode(fsp, port, oplock_request);
914 if (delete_on_close) {
915 NTSTATUS result = set_delete_on_close_internal(fsp, delete_on_close);
917 if (NT_STATUS_V(result) != NT_STATUS_V(NT_STATUS_OK)) {
918 unlock_share_entry_fsp(fsp);
925 unlock_share_entry_fsp(fsp);
927 conn->num_files_open++;
932 /****************************************************************************
933 Open a file for permissions read only. Return a pseudo file entry
934 with the 'stat_open' flag set
935 ****************************************************************************/
937 files_struct *open_file_stat(connection_struct *conn, char *fname,
938 SMB_STRUCT_STAT *psbuf, int smb_ofun, int *action)
940 extern struct current_user current_user;
941 files_struct *fsp = NULL;
943 if (!VALID_STAT(*psbuf)) {
944 DEBUG(0,("open_file_stat: unable to stat name = %s. Error was %s\n", fname, strerror(errno) ));
948 if(S_ISDIR(psbuf->st_mode)) {
949 DEBUG(0,("open_file_stat: %s is a directory !\n", fname ));
953 fsp = file_new(conn);
957 *action = FILE_WAS_OPENED;
959 DEBUG(5,("open_file_stat: opening file %s as a stat entry\n", fname));
962 * Setup the files_struct for it.
965 fsp->mode = psbuf->st_mode;
966 fsp->inode = psbuf->st_ino;
967 fsp->dev = psbuf->st_dev;
968 fsp->size = psbuf->st_size;
969 fsp->vuid = current_user.vuid;
971 fsp->can_lock = False;
972 fsp->can_read = False;
973 fsp->can_write = False;
975 fsp->print_file = False;
976 fsp->modified = False;
977 fsp->oplock_type = NO_OPLOCK;
978 fsp->sent_oplock_break = NO_BREAK_SENT;
979 fsp->is_directory = False;
980 fsp->stat_open = True;
981 fsp->directory_delete_on_close = False;
983 string_set(&fsp->fsp_name,fname);
984 fsp->wcp = NULL; /* Write cache pointer. */
986 conn->num_files_open++;
991 /****************************************************************************
992 Open a file for for write to ensure that we can fchmod it.
993 ****************************************************************************/
995 files_struct *open_file_fchmod(connection_struct *conn, char *fname, SMB_STRUCT_STAT *psbuf)
997 files_struct *fsp = NULL;
1000 if (!VALID_STAT(*psbuf))
1003 fsp = file_new(conn);
1007 fsp_open = open_file(fsp,conn,fname,psbuf,O_WRONLY,0);
1010 * This is not a user visible file open.
1011 * Don't set a share mode and don't increment
1012 * the conn->num_files_open.
1023 /****************************************************************************
1024 Close the fchmod file fd - ensure no locks are lost.
1025 ****************************************************************************/
1027 int close_file_fchmod(files_struct *fsp)
1029 int ret = fd_close(fsp->conn, fsp);
1034 /****************************************************************************
1035 Open a directory from an NT SMB call.
1036 ****************************************************************************/
1038 files_struct *open_directory(connection_struct *conn, char *fname,
1039 SMB_STRUCT_STAT *psbuf, int share_mode, int smb_ofun, mode_t unixmode, int *action)
1041 extern struct current_user current_user;
1042 BOOL got_stat = False;
1043 files_struct *fsp = file_new(conn);
1044 BOOL delete_on_close = GET_DELETE_ON_CLOSE_FLAG(share_mode);
1049 fsp->conn = conn; /* The vfs_fXXX() macros need this. */
1051 if (VALID_STAT(*psbuf))
1054 if (got_stat && (GET_FILE_OPEN_DISPOSITION(smb_ofun) == FILE_EXISTS_FAIL)) {
1056 errno = EEXIST; /* Setup so correct error is returned to client. */
1060 if (GET_FILE_CREATE_DISPOSITION(smb_ofun) == FILE_CREATE_IF_NOT_EXIST) {
1064 if(!S_ISDIR(psbuf->st_mode)) {
1065 DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
1070 *action = FILE_WAS_OPENED;
1075 * Try and create the directory.
1078 if(!CAN_WRITE(conn)) {
1079 DEBUG(2,("open_directory: failing create on read-only share\n"));
1085 if(vfs_mkdir(conn,fname, unix_mode(conn,aDIR, fname)) < 0) {
1086 DEBUG(2,("open_directory: unable to create %s. Error was %s\n",
1087 fname, strerror(errno) ));
1092 if(vfs_stat(conn,fname, psbuf) != 0) {
1097 *action = FILE_WAS_CREATED;
1103 * Don't create - just check that it *was* a directory.
1107 DEBUG(0,("open_directory: unable to stat name = %s. Error was %s\n",
1108 fname, strerror(errno) ));
1113 if(!S_ISDIR(psbuf->st_mode)) {
1114 DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
1119 *action = FILE_WAS_OPENED;
1122 DEBUG(5,("open_directory: opening directory %s\n", fname));
1125 * Setup the files_struct for it.
1128 fsp->mode = psbuf->st_mode;
1129 fsp->inode = psbuf->st_ino;
1130 fsp->dev = psbuf->st_dev;
1131 fsp->size = psbuf->st_size;
1132 fsp->vuid = current_user.vuid;
1134 fsp->can_lock = True;
1135 fsp->can_read = False;
1136 fsp->can_write = False;
1137 fsp->share_mode = share_mode;
1138 fsp->print_file = False;
1139 fsp->modified = False;
1140 fsp->oplock_type = NO_OPLOCK;
1141 fsp->sent_oplock_break = NO_BREAK_SENT;
1142 fsp->is_directory = True;
1143 fsp->directory_delete_on_close = False;
1145 string_set(&fsp->fsp_name,fname);
1147 if (delete_on_close) {
1148 NTSTATUS result = set_delete_on_close_internal(fsp, delete_on_close);
1150 if (NT_STATUS_V(result) != NT_STATUS_V(NT_STATUS_OK)) {
1155 conn->num_files_open++;
1160 /*******************************************************************
1161 Check if the share mode on a file allows it to be deleted or unlinked.
1162 Return True if sharing doesn't prevent the operation.
1163 ********************************************************************/
1165 BOOL check_file_sharing(connection_struct *conn,char *fname, BOOL rename_op)
1169 share_mode_entry *old_shares = 0;
1170 int num_share_modes;
1171 SMB_STRUCT_STAT sbuf;
1172 pid_t pid = sys_getpid();
1176 if (vfs_stat(conn,fname,&sbuf) == -1)
1180 inode = sbuf.st_ino;
1182 lock_share_entry(conn, dev, inode);
1183 num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
1186 * Check if the share modes will give us access.
1189 if(num_share_modes != 0)
1196 broke_oplock = False;
1197 for(i = 0; i < num_share_modes; i++)
1199 share_mode_entry *share_entry = &old_shares[i];
1202 * Break oplocks before checking share modes. See comment in
1203 * open_file_shared for details.
1204 * Check if someone has an oplock on this file. If so we must
1205 * break it before continuing.
1207 if(BATCH_OPLOCK_TYPE(share_entry->op_type))
1212 /* JRA. Try removing this code to see if the new oplock changes
1213 fix the problem. I'm dubious, but Andrew is recommending we
1218 * It appears that the NT redirector may have a bug, in that
1219 * it tries to do an SMBmv on a file that it has open with a
1220 * batch oplock, and then fails to respond to the oplock break
1221 * request. This only seems to occur when the client is doing an
1222 * SMBmv to the smbd it is using - thus we try and detect this
1223 * condition by checking if the file being moved is open and oplocked by
1224 * this smbd process, and then not sending the oplock break in this
1225 * special case. If the file was open with a deny mode that
1226 * prevents the move the SMBmv will fail anyway with a share
1227 * violation error. JRA.
1229 if(rename_op && (share_entry->pid == pid))
1232 DEBUG(0,("check_file_sharing: NT redirector workaround - rename attempted on \
1233 batch oplocked file %s, dev = %x, inode = %.0f\n", fname, (unsigned int)dev, (double)inode));
1236 * This next line is a test that allows the deny-mode
1237 * processing to be skipped. This seems to be needed as
1238 * NT insists on the rename succeeding (in Office 9x no less !).
1239 * This should be removed as soon as (a) MS fix the redirector
1240 * bug or (b) NT SMB support in Samba makes NT not issue the
1241 * call (as is my fervent hope). JRA.
1249 DEBUG(5,("check_file_sharing: breaking oplock (%x) on file %s, \
1250 dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode));
1252 /* Oplock break.... */
1253 unlock_share_entry(conn, dev, inode);
1254 if(request_oplock_break(share_entry) == False)
1256 DEBUG(0,("check_file_sharing: FAILED when breaking oplock (%x) on file %s, \
1257 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
1259 SAFE_FREE(old_shares);
1262 lock_share_entry(conn, dev, inode);
1263 broke_oplock = True;
1269 * If this is a delete request and ALLOW_SHARE_DELETE is set then allow
1270 * this to proceed. This takes precedence over share modes.
1273 if(!rename_op && GET_ALLOW_SHARE_DELETE(share_entry->share_mode))
1277 * Someone else has a share lock on it, check to see
1281 if ((GET_DENY_MODE(share_entry->share_mode) != DENY_DOS) ||
1282 (share_entry->pid != pid))
1289 SAFE_FREE(old_shares);
1290 num_share_modes = get_share_modes(conn, dev, inode, &old_shares);
1292 } while(broke_oplock);
1295 /* XXXX exactly what share mode combinations should be allowed for
1296 deleting/renaming? */
1298 * If we got here then either there were no share modes or
1299 * all share modes were DENY_DOS and the pid == getpid() or
1300 * delete access was requested and all share modes had the
1301 * ALLOW_SHARE_DELETE bit set (takes precedence over other
1309 unlock_share_entry(conn, dev, inode);
1310 SAFE_FREE(old_shares);