2 * Server-side file descriptor management
4 * Copyright (C) 2000, 2003 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/port.h"
37 #ifdef HAVE_SYS_POLL_H
40 #ifdef HAVE_LINUX_MAJOR_H
41 #include <linux/major.h>
43 #ifdef HAVE_SYS_STATVFS_H
44 #include <sys/statvfs.h>
49 #ifdef HAVE_SYS_PARAM_H
50 #include <sys/param.h>
52 #ifdef HAVE_SYS_MOUNT_H
53 #include <sys/mount.h>
55 #ifdef HAVE_SYS_STATFS_H
56 #include <sys/statfs.h>
58 #ifdef HAVE_SYS_EVENT_H
59 #include <sys/event.h>
68 #include <sys/types.h>
72 #define WIN32_NO_STATUS
81 #if defined(HAVE_SYS_EPOLL_H) && defined(HAVE_EPOLL_CREATE)
82 # include <sys/epoll.h>
84 #elif defined(linux) && defined(__i386__) && defined(HAVE_STDINT_H)
86 # define EPOLLIN POLLIN
87 # define EPOLLOUT POLLOUT
88 # define EPOLLERR POLLERR
89 # define EPOLLHUP POLLHUP
90 # define EPOLL_CTL_ADD 1
91 # define EPOLL_CTL_DEL 2
92 # define EPOLL_CTL_MOD 3
94 typedef union epoll_data
108 #define SYSCALL_RET(ret) do { \
109 if (ret < 0) { errno = -ret; ret = -1; } \
113 static inline int epoll_create( int size )
116 __asm__( "pushl %%ebx; movl %2,%%ebx; int $0x80; popl %%ebx"
117 : "=a" (ret) : "0" (254 /*NR_epoll_create*/), "r" (size) );
121 static inline int epoll_ctl( int epfd, int op, int fd, const struct epoll_event *event )
124 __asm__( "pushl %%ebx; movl %2,%%ebx; int $0x80; popl %%ebx"
126 : "0" (255 /*NR_epoll_ctl*/), "r" (epfd), "c" (op), "d" (fd), "S" (event), "m" (*event) );
130 static inline int epoll_wait( int epfd, struct epoll_event *events, int maxevents, int timeout )
133 __asm__( "pushl %%ebx; movl %2,%%ebx; int $0x80; popl %%ebx"
135 : "0" (256 /*NR_epoll_wait*/), "r" (epfd), "c" (events), "d" (maxevents), "S" (timeout)
141 #endif /* linux && __i386__ && HAVE_STDINT_H */
144 /* Because of the stupid Posix locking semantics, we need to keep
145 * track of all file descriptors referencing a given file, and not
146 * close a single one until all the locks are gone (sigh).
149 /* file descriptor object */
151 /* closed_fd is used to keep track of the unix fd belonging to a closed fd object */
154 struct list entry; /* entry in inode closed list */
155 int unix_fd; /* the unix file descriptor */
156 char unlink[1]; /* name to unlink on close (if any) */
161 struct object obj; /* object header */
162 const struct fd_ops *fd_ops; /* file descriptor operations */
163 struct inode *inode; /* inode that this fd belongs to */
164 struct list inode_entry; /* entry in inode fd list */
165 struct closed_fd *closed; /* structure to store the unix fd at destroy time */
166 struct object *user; /* object using this file descriptor */
167 struct list locks; /* list of locks on this fd */
168 unsigned int access; /* file access (FILE_READ_DATA etc.) */
169 unsigned int sharing; /* file sharing mode */
170 int unix_fd; /* unix file descriptor */
171 int signaled :1; /* is the fd signaled? */
172 int fs_locks :1; /* can we use filesystem locks for this fd? */
173 int unmounted :1;/* has the device been unmounted? */
174 int poll_index; /* index of fd in poll array */
175 struct async_queue *read_q; /* async readers of this fd */
176 struct async_queue *write_q; /* async writers of this fd */
177 struct async_queue *wait_q; /* other async waiters of this fd */
180 static void fd_dump( struct object *obj, int verbose );
181 static void fd_destroy( struct object *obj );
183 static const struct object_ops fd_ops =
185 sizeof(struct fd), /* size */
187 no_add_queue, /* add_queue */
188 NULL, /* remove_queue */
190 NULL, /* satisfied */
191 no_signal, /* signal */
192 no_get_fd, /* get_fd */
193 no_map_access, /* map_access */
194 no_lookup_name, /* lookup_name */
195 no_open_file, /* open_file */
196 no_close_handle, /* close_handle */
197 fd_destroy /* destroy */
202 #define DEVICE_HASH_SIZE 7
203 #define INODE_HASH_SIZE 17
207 struct object obj; /* object header */
208 struct list entry; /* entry in device hash list */
209 dev_t dev; /* device number */
210 int removable; /* removable device? (or -1 if unknown) */
211 struct list inode_hash[INODE_HASH_SIZE]; /* inodes hash table */
214 static void device_dump( struct object *obj, int verbose );
215 static void device_destroy( struct object *obj );
217 static const struct object_ops device_ops =
219 sizeof(struct device), /* size */
220 device_dump, /* dump */
221 no_add_queue, /* add_queue */
222 NULL, /* remove_queue */
224 NULL, /* satisfied */
225 no_signal, /* signal */
226 no_get_fd, /* get_fd */
227 no_map_access, /* map_access */
228 no_lookup_name, /* lookup_name */
229 no_open_file, /* open_file */
230 no_close_handle, /* close_handle */
231 device_destroy /* destroy */
238 struct object obj; /* object header */
239 struct list entry; /* inode hash list entry */
240 struct device *device; /* device containing this inode */
241 ino_t ino; /* inode number */
242 struct list open; /* list of open file descriptors */
243 struct list locks; /* list of file locks */
244 struct list closed; /* list of file descriptors to close at destroy time */
247 static void inode_dump( struct object *obj, int verbose );
248 static void inode_destroy( struct object *obj );
250 static const struct object_ops inode_ops =
252 sizeof(struct inode), /* size */
253 inode_dump, /* dump */
254 no_add_queue, /* add_queue */
255 NULL, /* remove_queue */
257 NULL, /* satisfied */
258 no_signal, /* signal */
259 no_get_fd, /* get_fd */
260 no_map_access, /* map_access */
261 no_lookup_name, /* lookup_name */
262 no_open_file, /* open_file */
263 no_close_handle, /* close_handle */
264 inode_destroy /* destroy */
267 /* file lock object */
271 struct object obj; /* object header */
272 struct fd *fd; /* fd owning this lock */
273 struct list fd_entry; /* entry in list of locks on a given fd */
274 struct list inode_entry; /* entry in inode list of locks */
275 int shared; /* shared lock? */
276 file_pos_t start; /* locked region is interval [start;end) */
278 struct process *process; /* process owning this lock */
279 struct list proc_entry; /* entry in list of locks owned by the process */
282 static void file_lock_dump( struct object *obj, int verbose );
283 static int file_lock_signaled( struct object *obj, struct thread *thread );
285 static const struct object_ops file_lock_ops =
287 sizeof(struct file_lock), /* size */
288 file_lock_dump, /* dump */
289 add_queue, /* add_queue */
290 remove_queue, /* remove_queue */
291 file_lock_signaled, /* signaled */
292 no_satisfied, /* satisfied */
293 no_signal, /* signal */
294 no_get_fd, /* get_fd */
295 no_map_access, /* map_access */
296 no_lookup_name, /* lookup_name */
297 no_open_file, /* open_file */
298 no_close_handle, /* close_handle */
299 no_destroy /* destroy */
303 #define OFF_T_MAX (~((file_pos_t)1 << (8*sizeof(off_t)-1)))
304 #define FILE_POS_T_MAX (~(file_pos_t)0)
306 static file_pos_t max_unix_offset = OFF_T_MAX;
308 #define DUMP_LONG_LONG(val) do { \
309 if (sizeof(val) > sizeof(unsigned long) && (val) > ~0UL) \
310 fprintf( stderr, "%lx%08lx", (unsigned long)((unsigned long long)(val) >> 32), (unsigned long)(val) ); \
312 fprintf( stderr, "%lx", (unsigned long)(val) ); \
317 /****************************************************************/
318 /* timeouts support */
322 struct list entry; /* entry in sorted timeout list */
323 struct timeval when; /* timeout expiry (absolute time) */
324 timeout_callback callback; /* callback function */
325 void *private; /* callback private data */
328 static struct list timeout_list = LIST_INIT(timeout_list); /* sorted timeouts list */
329 struct timeval current_time;
331 /* add a timeout user */
332 struct timeout_user *add_timeout_user( const struct timeval *when, timeout_callback func,
335 struct timeout_user *user;
338 if (!(user = mem_alloc( sizeof(*user) ))) return NULL;
340 user->callback = func;
341 user->private = private;
343 /* Now insert it in the linked list */
345 LIST_FOR_EACH( ptr, &timeout_list )
347 struct timeout_user *timeout = LIST_ENTRY( ptr, struct timeout_user, entry );
348 if (!time_before( &timeout->when, when )) break;
350 list_add_before( ptr, &user->entry );
354 /* remove a timeout user */
355 void remove_timeout_user( struct timeout_user *user )
357 list_remove( &user->entry );
361 /* add a timeout in milliseconds to an absolute time */
362 void add_timeout( struct timeval *when, int timeout )
366 long sec = timeout / 1000;
367 if ((when->tv_usec += (timeout - 1000*sec) * 1000) >= 1000000)
369 when->tv_usec -= 1000000;
377 /****************************************************************/
380 static struct fd **poll_users; /* users array */
381 static struct pollfd *pollfd; /* poll fd array */
382 static int nb_users; /* count of array entries actually in use */
383 static int active_users; /* current number of active users */
384 static int allocated_users; /* count of allocated entries in the array */
385 static struct fd **freelist; /* list of free entries in the array */
387 static int get_next_timeout(void);
391 static int epoll_fd = -1;
393 static inline void init_epoll(void)
395 epoll_fd = epoll_create( 128 );
398 /* set the events that epoll waits for on this fd; helper for set_fd_events */
399 static inline void set_fd_epoll_events( struct fd *fd, int user, int events )
401 struct epoll_event ev;
404 if (epoll_fd == -1) return;
406 if (events == -1) /* stop waiting on this fd completely */
408 if (pollfd[user].fd == -1) return; /* already removed */
411 else if (pollfd[user].fd == -1)
413 if (pollfd[user].events) return; /* stopped waiting on it, don't restart */
418 if (pollfd[user].events == events) return; /* nothing to do */
423 memset(&ev.data, 0, sizeof(ev.data));
426 if (epoll_ctl( epoll_fd, ctl, fd->unix_fd, &ev ) == -1)
428 if (errno == ENOMEM) /* not enough memory, give up on epoll */
433 else perror( "epoll_ctl" ); /* should not happen */
437 static inline void remove_epoll_user( struct fd *fd, int user )
439 if (epoll_fd == -1) return;
441 if (pollfd[user].fd != -1)
443 struct epoll_event dummy;
444 epoll_ctl( epoll_fd, EPOLL_CTL_DEL, fd->unix_fd, &dummy );
448 static inline void main_loop_epoll(void)
451 struct epoll_event events[128];
453 assert( POLLIN == EPOLLIN );
454 assert( POLLOUT == EPOLLOUT );
455 assert( POLLERR == EPOLLERR );
456 assert( POLLHUP == EPOLLHUP );
458 if (epoll_fd == -1) return;
462 timeout = get_next_timeout();
464 if (!active_users) break; /* last user removed by a timeout */
465 if (epoll_fd == -1) break; /* an error occurred with epoll */
467 ret = epoll_wait( epoll_fd, events, sizeof(events)/sizeof(events[0]), timeout );
468 gettimeofday( ¤t_time, NULL );
470 /* put the events into the pollfd array first, like poll does */
471 for (i = 0; i < ret; i++)
473 int user = events[i].data.u32;
474 pollfd[user].revents = events[i].events;
477 /* read events from the pollfd array, as set_fd_events may modify them */
478 for (i = 0; i < ret; i++)
480 int user = events[i].data.u32;
481 if (pollfd[user].revents) fd_poll_event( poll_users[user], pollfd[user].revents );
486 #elif defined(HAVE_KQUEUE)
488 static int kqueue_fd = -1;
490 static inline void init_epoll(void)
492 #ifndef __APPLE__ /* kqueue support is broken in the MacOS kernel so we can't use it */
493 kqueue_fd = kqueue();
497 static inline void set_fd_epoll_events( struct fd *fd, int user, int events )
501 if (kqueue_fd == -1) return;
503 EV_SET( &ev[0], fd->unix_fd, EVFILT_READ, 0, NOTE_LOWAT, 1, (void *)user );
504 EV_SET( &ev[1], fd->unix_fd, EVFILT_WRITE, 0, NOTE_LOWAT, 1, (void *)user );
506 if (events == -1) /* stop waiting on this fd completely */
508 if (pollfd[user].fd == -1) return; /* already removed */
509 ev[0].flags |= EV_DELETE;
510 ev[1].flags |= EV_DELETE;
512 else if (pollfd[user].fd == -1)
514 if (pollfd[user].events) return; /* stopped waiting on it, don't restart */
515 ev[0].flags |= EV_ADD | ((events & POLLIN) ? EV_ENABLE : EV_DISABLE);
516 ev[1].flags |= EV_ADD | ((events & POLLOUT) ? EV_ENABLE : EV_DISABLE);
520 if (pollfd[user].events == events) return; /* nothing to do */
521 ev[0].flags |= (events & POLLIN) ? EV_ENABLE : EV_DISABLE;
522 ev[1].flags |= (events & POLLOUT) ? EV_ENABLE : EV_DISABLE;
525 if (kevent( kqueue_fd, ev, 2, NULL, 0, NULL ) == -1)
527 if (errno == ENOMEM) /* not enough memory, give up on kqueue */
532 else perror( "kevent" ); /* should not happen */
536 static inline void remove_epoll_user( struct fd *fd, int user )
538 if (kqueue_fd == -1) return;
540 if (pollfd[user].fd != -1)
544 EV_SET( &ev[0], fd->unix_fd, EVFILT_READ, EV_DELETE, 0, 0, 0 );
545 EV_SET( &ev[1], fd->unix_fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0 );
546 kevent( kqueue_fd, ev, 2, NULL, 0, NULL );
550 static inline void main_loop_epoll(void)
553 struct kevent events[128];
555 if (kqueue_fd == -1) return;
559 timeout = get_next_timeout();
561 if (!active_users) break; /* last user removed by a timeout */
562 if (kqueue_fd == -1) break; /* an error occurred with kqueue */
568 ts.tv_sec = timeout / 1000;
569 ts.tv_nsec = (timeout % 1000) * 1000000;
570 ret = kevent( kqueue_fd, NULL, 0, events, sizeof(events)/sizeof(events[0]), &ts );
572 else ret = kevent( kqueue_fd, NULL, 0, events, sizeof(events)/sizeof(events[0]), NULL );
574 gettimeofday( ¤t_time, NULL );
576 /* put the events into the pollfd array first, like poll does */
577 for (i = 0; i < ret; i++)
579 long user = (long)events[i].udata;
580 pollfd[user].revents = 0;
582 for (i = 0; i < ret; i++)
584 long user = (long)events[i].udata;
585 if (events[i].filter == EVFILT_READ) pollfd[user].revents |= POLLIN;
586 else if (events[i].filter == EVFILT_WRITE) pollfd[user].revents |= POLLOUT;
587 if (events[i].flags & EV_EOF) pollfd[user].revents |= POLLHUP;
588 if (events[i].flags & EV_ERROR) pollfd[user].revents |= POLLERR;
591 /* read events from the pollfd array, as set_fd_events may modify them */
592 for (i = 0; i < ret; i++)
594 long user = (long)events[i].udata;
595 if (pollfd[user].revents) fd_poll_event( poll_users[user], pollfd[user].revents );
596 pollfd[user].revents = 0;
601 #else /* HAVE_KQUEUE */
603 static inline void init_epoll(void) { }
604 static inline void set_fd_epoll_events( struct fd *fd, int user, int events ) { }
605 static inline void remove_epoll_user( struct fd *fd, int user ) { }
606 static inline void main_loop_epoll(void) { }
608 #endif /* USE_EPOLL */
611 /* add a user in the poll array and return its index, or -1 on failure */
612 static int add_poll_user( struct fd *fd )
617 ret = freelist - poll_users;
618 freelist = (struct fd **)poll_users[ret];
622 if (nb_users == allocated_users)
624 struct fd **newusers;
625 struct pollfd *newpoll;
626 int new_count = allocated_users ? (allocated_users + allocated_users / 2) : 16;
627 if (!(newusers = realloc( poll_users, new_count * sizeof(*poll_users) ))) return -1;
628 if (!(newpoll = realloc( pollfd, new_count * sizeof(*pollfd) )))
631 poll_users = newusers;
636 poll_users = newusers;
638 if (!allocated_users) init_epoll();
639 allocated_users = new_count;
644 pollfd[ret].events = 0;
645 pollfd[ret].revents = 0;
646 poll_users[ret] = fd;
651 /* remove a user from the poll list */
652 static void remove_poll_user( struct fd *fd, int user )
655 assert( poll_users[user] == fd );
657 remove_epoll_user( fd, user );
658 pollfd[user].fd = -1;
659 pollfd[user].events = 0;
660 pollfd[user].revents = 0;
661 poll_users[user] = (struct fd *)freelist;
662 freelist = &poll_users[user];
666 /* process pending timeouts and return the time until the next timeout, in milliseconds */
667 static int get_next_timeout(void)
669 if (!list_empty( &timeout_list ))
671 struct list expired_list, *ptr;
673 /* first remove all expired timers from the list */
675 list_init( &expired_list );
676 while ((ptr = list_head( &timeout_list )) != NULL)
678 struct timeout_user *timeout = LIST_ENTRY( ptr, struct timeout_user, entry );
680 if (!time_before( ¤t_time, &timeout->when ))
682 list_remove( &timeout->entry );
683 list_add_tail( &expired_list, &timeout->entry );
688 /* now call the callback for all the removed timers */
690 while ((ptr = list_head( &expired_list )) != NULL)
692 struct timeout_user *timeout = LIST_ENTRY( ptr, struct timeout_user, entry );
693 list_remove( &timeout->entry );
694 timeout->callback( timeout->private );
698 if ((ptr = list_head( &timeout_list )) != NULL)
700 struct timeout_user *timeout = LIST_ENTRY( ptr, struct timeout_user, entry );
701 int diff = (timeout->when.tv_sec - current_time.tv_sec) * 1000
702 + (timeout->when.tv_usec - current_time.tv_usec + 999) / 1000;
703 if (diff < 0) diff = 0;
707 return -1; /* no pending timeouts */
710 /* server main poll() loop */
715 gettimeofday( ¤t_time, NULL );
718 /* fall through to normal poll loop */
722 timeout = get_next_timeout();
724 if (!active_users) break; /* last user removed by a timeout */
726 ret = poll( pollfd, nb_users, timeout );
727 gettimeofday( ¤t_time, NULL );
731 for (i = 0; i < nb_users; i++)
733 if (pollfd[i].revents)
735 fd_poll_event( poll_users[i], pollfd[i].revents );
744 /****************************************************************/
745 /* device functions */
747 static struct list device_hash[DEVICE_HASH_SIZE];
749 static int is_device_removable( dev_t dev, int unix_fd )
751 #if defined(linux) && defined(HAVE_FSTATFS)
754 /* check for floppy disk */
755 if (major(dev) == FLOPPY_MAJOR) return 1;
757 if (fstatfs( unix_fd, &stfs ) == -1) return 0;
758 return (stfs.f_type == 0x9660 || /* iso9660 */
759 stfs.f_type == 0x9fa1 || /* supermount */
760 stfs.f_type == 0x15013346); /* udf */
761 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)
764 if (fstatfs( unix_fd, &stfs ) == -1) return 0;
765 return (!strncmp("cd9660", stfs.f_fstypename, sizeof(stfs.f_fstypename)) ||
766 !strncmp("udf", stfs.f_fstypename, sizeof(stfs.f_fstypename)));
767 #elif defined(__NetBSD__)
770 if (fstatvfs( unix_fd, &stfs ) == -1) return 0;
771 return (!strncmp("cd9660", stfs.f_fstypename, sizeof(stfs.f_fstypename)) ||
772 !strncmp("udf", stfs.f_fstypename, sizeof(stfs.f_fstypename)));
774 # include <sys/dkio.h>
775 # include <sys/vtoc.h>
776 struct dk_cinfo dkinf;
777 if (ioctl( unix_fd, DKIOCINFO, &dkinf ) == -1) return 0;
778 return (dkinf.dki_ctype == DKC_CDROM ||
779 dkinf.dki_ctype == DKC_NCRFLOPPY ||
780 dkinf.dki_ctype == DKC_SMSFLOPPY ||
781 dkinf.dki_ctype == DKC_INTEL82072 ||
782 dkinf.dki_ctype == DKC_INTEL82077);
788 /* retrieve the device object for a given fd, creating it if needed */
789 static struct device *get_device( dev_t dev, int unix_fd )
791 struct device *device;
792 unsigned int i, hash = dev % DEVICE_HASH_SIZE;
794 if (device_hash[hash].next)
796 LIST_FOR_EACH_ENTRY( device, &device_hash[hash], struct device, entry )
797 if (device->dev == dev) return (struct device *)grab_object( device );
799 else list_init( &device_hash[hash] );
801 /* not found, create it */
803 if (unix_fd == -1) return NULL;
804 if ((device = alloc_object( &device_ops )))
807 device->removable = is_device_removable( dev, unix_fd );
808 for (i = 0; i < INODE_HASH_SIZE; i++) list_init( &device->inode_hash[i] );
809 list_add_head( &device_hash[hash], &device->entry );
814 static void device_dump( struct object *obj, int verbose )
816 struct device *device = (struct device *)obj;
817 fprintf( stderr, "Device dev=" );
818 DUMP_LONG_LONG( device->dev );
819 fprintf( stderr, "\n" );
822 static void device_destroy( struct object *obj )
824 struct device *device = (struct device *)obj;
827 for (i = 0; i < INODE_HASH_SIZE; i++)
828 assert( list_empty(&device->inode_hash[i]) );
830 list_remove( &device->entry ); /* remove it from the hash table */
834 /****************************************************************/
835 /* inode functions */
837 /* close all pending file descriptors in the closed list */
838 static void inode_close_pending( struct inode *inode, int keep_unlinks )
840 struct list *ptr = list_head( &inode->closed );
844 struct closed_fd *fd = LIST_ENTRY( ptr, struct closed_fd, entry );
845 struct list *next = list_next( &inode->closed, ptr );
847 if (fd->unix_fd != -1)
849 close( fd->unix_fd );
852 if (!keep_unlinks || !fd->unlink[0]) /* get rid of it unless there's an unlink pending on that file */
861 static void inode_dump( struct object *obj, int verbose )
863 struct inode *inode = (struct inode *)obj;
864 fprintf( stderr, "Inode device=%p ino=", inode->device );
865 DUMP_LONG_LONG( inode->ino );
866 fprintf( stderr, "\n" );
869 static void inode_destroy( struct object *obj )
871 struct inode *inode = (struct inode *)obj;
874 assert( list_empty(&inode->open) );
875 assert( list_empty(&inode->locks) );
877 list_remove( &inode->entry );
879 while ((ptr = list_head( &inode->closed )))
881 struct closed_fd *fd = LIST_ENTRY( ptr, struct closed_fd, entry );
883 if (fd->unix_fd != -1) close( fd->unix_fd );
886 /* make sure it is still the same file */
888 if (!stat( fd->unlink, &st ) && st.st_dev == inode->device->dev && st.st_ino == inode->ino)
890 if (S_ISDIR(st.st_mode)) rmdir( fd->unlink );
891 else unlink( fd->unlink );
896 release_object( inode->device );
899 /* retrieve the inode object for a given fd, creating it if needed */
900 static struct inode *get_inode( dev_t dev, ino_t ino, int unix_fd )
902 struct device *device;
904 unsigned int hash = ino % INODE_HASH_SIZE;
906 if (!(device = get_device( dev, unix_fd ))) return NULL;
908 LIST_FOR_EACH_ENTRY( inode, &device->inode_hash[hash], struct inode, entry )
910 if (inode->ino == ino)
912 release_object( device );
913 return (struct inode *)grab_object( inode );
917 /* not found, create it */
918 if ((inode = alloc_object( &inode_ops )))
920 inode->device = device;
922 list_init( &inode->open );
923 list_init( &inode->locks );
924 list_init( &inode->closed );
925 list_add_head( &device->inode_hash[hash], &inode->entry );
927 else release_object( device );
932 /* add fd to the inode list of file descriptors to close */
933 static void inode_add_closed_fd( struct inode *inode, struct closed_fd *fd )
935 if (!list_empty( &inode->locks ))
937 list_add_head( &inode->closed, &fd->entry );
939 else if (fd->unlink[0]) /* close the fd but keep the structure around for unlink */
941 if (fd->unix_fd != -1) close( fd->unix_fd );
943 list_add_head( &inode->closed, &fd->entry );
945 else /* no locks on this inode and no unlink, get rid of the fd */
947 if (fd->unix_fd != -1) close( fd->unix_fd );
953 /****************************************************************/
954 /* file lock functions */
956 static void file_lock_dump( struct object *obj, int verbose )
958 struct file_lock *lock = (struct file_lock *)obj;
959 fprintf( stderr, "Lock %s fd=%p proc=%p start=",
960 lock->shared ? "shared" : "excl", lock->fd, lock->process );
961 DUMP_LONG_LONG( lock->start );
962 fprintf( stderr, " end=" );
963 DUMP_LONG_LONG( lock->end );
964 fprintf( stderr, "\n" );
967 static int file_lock_signaled( struct object *obj, struct thread *thread )
969 struct file_lock *lock = (struct file_lock *)obj;
970 /* lock is signaled if it has lost its owner */
971 return !lock->process;
974 /* set (or remove) a Unix lock if possible for the given range */
975 static int set_unix_lock( struct fd *fd, file_pos_t start, file_pos_t end, int type )
979 if (!fd->fs_locks) return 1; /* no fs locks possible for this fd */
982 if (start == end) return 1; /* can't set zero-byte lock */
983 if (start > max_unix_offset) return 1; /* ignore it */
985 fl.l_whence = SEEK_SET;
987 if (!end || end > max_unix_offset) fl.l_len = 0;
988 else fl.l_len = end - start;
989 if (fcntl( fd->unix_fd, F_SETLK, &fl ) != -1) return 1;
994 /* check whether locks work at all on this file system */
995 if (fcntl( fd->unix_fd, F_GETLK, &fl ) != -1)
997 set_error( STATUS_FILE_LOCK_CONFLICT );
1003 /* no locking on this fs, just ignore it */
1007 set_error( STATUS_FILE_LOCK_CONFLICT );
1010 /* this can happen if we try to set a write lock on a read-only file */
1011 /* we just ignore that error */
1012 if (fl.l_type == F_WRLCK) return 1;
1013 set_error( STATUS_ACCESS_DENIED );
1019 /* this can happen if off_t is 64-bit but the kernel only supports 32-bit */
1020 /* in that case we shrink the limit and retry */
1021 if (max_unix_offset > INT_MAX)
1023 max_unix_offset = INT_MAX;
1034 /* check if interval [start;end) overlaps the lock */
1035 static inline int lock_overlaps( struct file_lock *lock, file_pos_t start, file_pos_t end )
1037 if (lock->end && start >= lock->end) return 0;
1038 if (end && lock->start >= end) return 0;
1042 /* remove Unix locks for all bytes in the specified area that are no longer locked */
1043 static void remove_unix_locks( struct fd *fd, file_pos_t start, file_pos_t end )
1051 } *first, *cur, *next, *buffer;
1056 if (!fd->inode) return;
1057 if (!fd->fs_locks) return;
1058 if (start == end || start > max_unix_offset) return;
1059 if (!end || end > max_unix_offset) end = max_unix_offset + 1;
1061 /* count the number of locks overlapping the specified area */
1063 LIST_FOR_EACH( ptr, &fd->inode->locks )
1065 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, inode_entry );
1066 if (lock->start == lock->end) continue;
1067 if (lock_overlaps( lock, start, end )) count++;
1070 if (!count) /* no locks at all, we can unlock everything */
1072 set_unix_lock( fd, start, end, F_UNLCK );
1076 /* allocate space for the list of holes */
1077 /* max. number of holes is number of locks + 1 */
1079 if (!(buffer = malloc( sizeof(*buffer) * (count+1) ))) return;
1083 first->start = start;
1087 /* build a sorted list of unlocked holes in the specified area */
1089 LIST_FOR_EACH( ptr, &fd->inode->locks )
1091 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, inode_entry );
1092 if (lock->start == lock->end) continue;
1093 if (!lock_overlaps( lock, start, end )) continue;
1095 /* go through all the holes touched by this lock */
1096 for (cur = first; cur; cur = cur->next)
1098 if (cur->end <= lock->start) continue; /* hole is before start of lock */
1099 if (lock->end && cur->start >= lock->end) break; /* hole is after end of lock */
1101 /* now we know that lock is overlapping hole */
1103 if (cur->start >= lock->start) /* lock starts before hole, shrink from start */
1105 cur->start = lock->end;
1106 if (cur->start && cur->start < cur->end) break; /* done with this lock */
1107 /* now hole is empty, remove it */
1108 if (cur->next) cur->next->prev = cur->prev;
1109 if (cur->prev) cur->prev->next = cur->next;
1110 else if (!(first = cur->next)) goto done; /* no more holes at all */
1112 else if (!lock->end || cur->end <= lock->end) /* lock larger than hole, shrink from end */
1114 cur->end = lock->start;
1115 assert( cur->start < cur->end );
1117 else /* lock is in the middle of hole, split hole in two */
1120 next->next = cur->next;
1122 next->start = lock->end;
1123 next->end = cur->end;
1124 cur->end = lock->start;
1125 assert( next->start < next->end );
1126 assert( cur->end < next->start );
1128 break; /* done with this lock */
1133 /* clear Unix locks for all the holes */
1135 for (cur = first; cur; cur = cur->next)
1136 set_unix_lock( fd, cur->start, cur->end, F_UNLCK );
1142 /* create a new lock on a fd */
1143 static struct file_lock *add_lock( struct fd *fd, int shared, file_pos_t start, file_pos_t end )
1145 struct file_lock *lock;
1147 if (!fd->inode) /* not a regular file */
1149 set_error( STATUS_INVALID_HANDLE );
1153 if (!(lock = alloc_object( &file_lock_ops ))) return NULL;
1154 lock->shared = shared;
1155 lock->start = start;
1158 lock->process = current->process;
1160 /* now try to set a Unix lock */
1161 if (!set_unix_lock( lock->fd, lock->start, lock->end, lock->shared ? F_RDLCK : F_WRLCK ))
1163 release_object( lock );
1166 list_add_head( &fd->locks, &lock->fd_entry );
1167 list_add_head( &fd->inode->locks, &lock->inode_entry );
1168 list_add_head( &lock->process->locks, &lock->proc_entry );
1172 /* remove an existing lock */
1173 static void remove_lock( struct file_lock *lock, int remove_unix )
1175 struct inode *inode = lock->fd->inode;
1177 list_remove( &lock->fd_entry );
1178 list_remove( &lock->inode_entry );
1179 list_remove( &lock->proc_entry );
1180 if (remove_unix) remove_unix_locks( lock->fd, lock->start, lock->end );
1181 if (list_empty( &inode->locks )) inode_close_pending( inode, 1 );
1182 lock->process = NULL;
1183 wake_up( &lock->obj, 0 );
1184 release_object( lock );
1187 /* remove all locks owned by a given process */
1188 void remove_process_locks( struct process *process )
1192 while ((ptr = list_head( &process->locks )))
1194 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, proc_entry );
1195 remove_lock( lock, 1 ); /* this removes it from the list */
1199 /* remove all locks on a given fd */
1200 static void remove_fd_locks( struct fd *fd )
1202 file_pos_t start = FILE_POS_T_MAX, end = 0;
1205 while ((ptr = list_head( &fd->locks )))
1207 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, fd_entry );
1208 if (lock->start < start) start = lock->start;
1209 if (!lock->end || lock->end > end) end = lock->end - 1;
1210 remove_lock( lock, 0 );
1212 if (start < end) remove_unix_locks( fd, start, end + 1 );
1215 /* add a lock on an fd */
1216 /* returns handle to wait on */
1217 obj_handle_t lock_fd( struct fd *fd, file_pos_t start, file_pos_t count, int shared, int wait )
1220 file_pos_t end = start + count;
1222 /* don't allow wrapping locks */
1223 if (end && end < start)
1225 set_error( STATUS_INVALID_PARAMETER );
1229 /* check if another lock on that file overlaps the area */
1230 LIST_FOR_EACH( ptr, &fd->inode->locks )
1232 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, inode_entry );
1233 if (!lock_overlaps( lock, start, end )) continue;
1234 if (lock->shared && shared) continue;
1238 set_error( STATUS_FILE_LOCK_CONFLICT );
1241 set_error( STATUS_PENDING );
1242 return alloc_handle( current->process, lock, SYNCHRONIZE, 0 );
1245 /* not found, add it */
1246 if (add_lock( fd, shared, start, end )) return 0;
1247 if (get_error() == STATUS_FILE_LOCK_CONFLICT)
1249 /* Unix lock conflict -> tell client to wait and retry */
1250 if (wait) set_error( STATUS_PENDING );
1255 /* remove a lock on an fd */
1256 void unlock_fd( struct fd *fd, file_pos_t start, file_pos_t count )
1259 file_pos_t end = start + count;
1261 /* find an existing lock with the exact same parameters */
1262 LIST_FOR_EACH( ptr, &fd->locks )
1264 struct file_lock *lock = LIST_ENTRY( ptr, struct file_lock, fd_entry );
1265 if ((lock->start == start) && (lock->end == end))
1267 remove_lock( lock, 1 );
1271 set_error( STATUS_FILE_LOCK_CONFLICT );
1275 /****************************************************************/
1276 /* file descriptor functions */
1278 static void fd_dump( struct object *obj, int verbose )
1280 struct fd *fd = (struct fd *)obj;
1281 fprintf( stderr, "Fd unix_fd=%d user=%p", fd->unix_fd, fd->user );
1282 if (fd->inode) fprintf( stderr, " inode=%p unlink='%s'", fd->inode, fd->closed->unlink );
1283 fprintf( stderr, "\n" );
1286 static void fd_destroy( struct object *obj )
1288 struct fd *fd = (struct fd *)obj;
1290 free_async_queue( fd->read_q );
1291 free_async_queue( fd->write_q );
1292 free_async_queue( fd->wait_q );
1294 remove_fd_locks( fd );
1295 list_remove( &fd->inode_entry );
1296 if (fd->poll_index != -1) remove_poll_user( fd, fd->poll_index );
1299 inode_add_closed_fd( fd->inode, fd->closed );
1300 release_object( fd->inode );
1302 else /* no inode, close it right away */
1304 if (fd->unix_fd != -1) close( fd->unix_fd );
1308 /* set the events that select waits for on this fd */
1309 void set_fd_events( struct fd *fd, int events )
1311 int user = fd->poll_index;
1312 assert( poll_users[user] == fd );
1314 set_fd_epoll_events( fd, user, events );
1316 if (events == -1) /* stop waiting on this fd completely */
1318 pollfd[user].fd = -1;
1319 pollfd[user].events = POLLERR;
1320 pollfd[user].revents = 0;
1322 else if (pollfd[user].fd != -1 || !pollfd[user].events)
1324 pollfd[user].fd = fd->unix_fd;
1325 pollfd[user].events = events;
1329 /* prepare an fd for unmounting its corresponding device */
1330 static inline void unmount_fd( struct fd *fd )
1332 assert( fd->inode );
1334 async_wake_up( fd->read_q, STATUS_VOLUME_DISMOUNTED );
1335 async_wake_up( fd->write_q, STATUS_VOLUME_DISMOUNTED );
1337 if (fd->poll_index != -1) set_fd_events( fd, -1 );
1339 if (fd->unix_fd != -1) close( fd->unix_fd );
1343 fd->closed->unix_fd = -1;
1344 fd->closed->unlink[0] = 0;
1346 /* stop using Unix locks on this fd (existing locks have been removed by close) */
1350 /* allocate an fd object, without setting the unix fd yet */
1351 static struct fd *alloc_fd_object(void)
1353 struct fd *fd = alloc_object( &fd_ops );
1355 if (!fd) return NULL;
1367 fd->poll_index = -1;
1371 list_init( &fd->inode_entry );
1372 list_init( &fd->locks );
1374 if ((fd->poll_index = add_poll_user( fd )) == -1)
1376 release_object( fd );
1382 /* allocate a pseudo fd object, for objects that need to behave like files but don't have a unix fd */
1383 struct fd *alloc_pseudo_fd( const struct fd_ops *fd_user_ops, struct object *user )
1385 struct fd *fd = alloc_object( &fd_ops );
1387 if (!fd) return NULL;
1389 fd->fd_ops = fd_user_ops;
1399 fd->poll_index = -1;
1403 list_init( &fd->inode_entry );
1404 list_init( &fd->locks );
1408 /* check if the desired access is possible without violating */
1409 /* the sharing mode of other opens of the same file */
1410 static int check_sharing( struct fd *fd, unsigned int access, unsigned int sharing )
1412 unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
1413 unsigned int existing_access = 0;
1416 /* if access mode is 0, sharing mode is ignored */
1417 if (!access) sharing = existing_sharing;
1418 fd->access = access;
1419 fd->sharing = sharing;
1421 LIST_FOR_EACH( ptr, &fd->inode->open )
1423 struct fd *fd_ptr = LIST_ENTRY( ptr, struct fd, inode_entry );
1426 existing_sharing &= fd_ptr->sharing;
1427 existing_access |= fd_ptr->access;
1431 if ((access & FILE_UNIX_READ_ACCESS) && !(existing_sharing & FILE_SHARE_READ)) return 0;
1432 if ((access & FILE_UNIX_WRITE_ACCESS) && !(existing_sharing & FILE_SHARE_WRITE)) return 0;
1433 if ((access & DELETE) && !(existing_sharing & FILE_SHARE_DELETE)) return 0;
1434 if ((existing_access & FILE_UNIX_READ_ACCESS) && !(sharing & FILE_SHARE_READ)) return 0;
1435 if ((existing_access & FILE_UNIX_WRITE_ACCESS) && !(sharing & FILE_SHARE_WRITE)) return 0;
1436 if ((existing_access & DELETE) && !(sharing & FILE_SHARE_DELETE)) return 0;
1440 /* sets the user of an fd that previously had no user */
1441 void set_fd_user( struct fd *fd, const struct fd_ops *user_ops, struct object *user )
1443 assert( fd->fd_ops == NULL );
1444 fd->fd_ops = user_ops;
1448 /* open() wrapper that returns a struct fd with no fd user set */
1449 struct fd *open_fd( const char *name, int flags, mode_t *mode, unsigned int access,
1450 unsigned int sharing, unsigned int options )
1453 struct closed_fd *closed_fd;
1455 const char *unlink_name = "";
1458 if ((options & FILE_DELETE_ON_CLOSE) && !(access & DELETE))
1460 set_error( STATUS_INVALID_PARAMETER );
1464 if (!(fd = alloc_fd_object())) return NULL;
1466 if (options & FILE_DELETE_ON_CLOSE) unlink_name = name;
1467 if (!(closed_fd = mem_alloc( sizeof(*closed_fd) + strlen(unlink_name) )))
1469 release_object( fd );
1473 /* create the directory if needed */
1474 if ((options & FILE_DIRECTORY_FILE) && (flags & O_CREAT))
1476 if (mkdir( name, 0777 ) == -1)
1478 if (errno != EEXIST || (flags & O_EXCL))
1484 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
1487 if ((access & FILE_UNIX_WRITE_ACCESS) && !(options & FILE_DIRECTORY_FILE))
1489 if (access & FILE_UNIX_READ_ACCESS) rw_mode = O_RDWR;
1490 else rw_mode = O_WRONLY;
1492 else rw_mode = O_RDONLY;
1494 if ((fd->unix_fd = open( name, rw_mode | (flags & ~O_TRUNC), *mode )) == -1)
1496 /* if we tried to open a directory for write access, retry read-only */
1497 if (errno != EISDIR ||
1498 !(access & FILE_UNIX_WRITE_ACCESS) ||
1499 (fd->unix_fd = open( name, O_RDONLY | (flags & ~O_TRUNC), *mode )) == -1)
1506 closed_fd->unix_fd = fd->unix_fd;
1507 closed_fd->unlink[0] = 0;
1508 fstat( fd->unix_fd, &st );
1511 /* only bother with an inode for normal files and directories */
1512 if (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode))
1514 struct inode *inode = get_inode( st.st_dev, st.st_ino, fd->unix_fd );
1518 /* we can close the fd because there are no others open on the same file,
1519 * otherwise we wouldn't have failed to allocate a new inode
1524 fd->closed = closed_fd;
1525 list_add_head( &inode->open, &fd->inode_entry );
1527 /* check directory options */
1528 if ((options & FILE_DIRECTORY_FILE) && !S_ISDIR(st.st_mode))
1530 release_object( fd );
1531 set_error( STATUS_NOT_A_DIRECTORY );
1534 if ((options & FILE_NON_DIRECTORY_FILE) && S_ISDIR(st.st_mode))
1536 release_object( fd );
1537 set_error( STATUS_FILE_IS_A_DIRECTORY );
1540 if (!check_sharing( fd, access, sharing ))
1542 release_object( fd );
1543 set_error( STATUS_SHARING_VIOLATION );
1546 strcpy( closed_fd->unlink, unlink_name );
1547 if (flags & O_TRUNC) ftruncate( fd->unix_fd, 0 );
1549 else /* special file */
1551 if (options & FILE_DIRECTORY_FILE)
1553 set_error( STATUS_NOT_A_DIRECTORY );
1556 if (unlink_name[0]) /* we can't unlink special files */
1558 set_error( STATUS_INVALID_PARAMETER );
1566 release_object( fd );
1571 /* create an fd for an anonymous file */
1572 /* if the function fails the unix fd is closed */
1573 struct fd *create_anonymous_fd( const struct fd_ops *fd_user_ops, int unix_fd, struct object *user )
1575 struct fd *fd = alloc_fd_object();
1579 set_fd_user( fd, fd_user_ops, user );
1580 fd->unix_fd = unix_fd;
1587 /* retrieve the object that is using an fd */
1588 void *get_fd_user( struct fd *fd )
1593 /* retrieve the unix fd for an object */
1594 int get_unix_fd( struct fd *fd )
1596 if (fd->unix_fd == -1)
1598 if (fd->unmounted) set_error( STATUS_VOLUME_DISMOUNTED );
1599 else set_error( STATUS_BAD_DEVICE_TYPE );
1604 /* check if two file descriptors point to the same file */
1605 int is_same_file_fd( struct fd *fd1, struct fd *fd2 )
1607 return fd1->inode == fd2->inode;
1610 /* check if fd is on a removable device */
1611 int is_fd_removable( struct fd *fd )
1613 return (fd->inode && fd->inode->device->removable);
1616 /* set or clear the fd signaled state */
1617 void set_fd_signaled( struct fd *fd, int signaled )
1619 fd->signaled = signaled;
1620 if (signaled) wake_up( fd->user, 0 );
1623 /* handler for close_handle that refuses to close fd-associated handles in other processes */
1624 int fd_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
1626 return (!current || current->process == process);
1629 /* callback for event happening in the main poll() loop */
1630 void fd_poll_event( struct fd *fd, int event )
1632 return fd->fd_ops->poll_event( fd, event );
1635 /* check if events are pending and if yes return which one(s) */
1636 int check_fd_events( struct fd *fd, int events )
1640 if (fd->unix_fd == -1) return POLLERR;
1642 pfd.fd = fd->unix_fd;
1643 pfd.events = events;
1644 if (poll( &pfd, 1, 0 ) <= 0) return 0;
1648 /* default signaled() routine for objects that poll() on an fd */
1649 int default_fd_signaled( struct object *obj, struct thread *thread )
1651 struct fd *fd = get_obj_fd( obj );
1652 int ret = fd->signaled;
1653 release_object( fd );
1657 int default_fd_get_poll_events( struct fd *fd )
1661 if (async_waiting( fd->read_q )) events |= POLLIN;
1662 if (async_waiting( fd->write_q )) events |= POLLOUT;
1666 /* default handler for poll() events */
1667 void default_poll_event( struct fd *fd, int event )
1669 if (event & POLLIN) async_wake_up( fd->read_q, STATUS_ALERTED );
1670 if (event & POLLOUT) async_wake_up( fd->write_q, STATUS_ALERTED );
1672 /* if an error occurred, stop polling this fd to avoid busy-looping */
1673 if (event & (POLLERR | POLLHUP)) set_fd_events( fd, -1 );
1674 else set_fd_events( fd, fd->fd_ops->get_poll_events( fd ) );
1677 struct async *fd_queue_async( struct fd *fd, const async_data_t *data, int type, int count )
1679 struct async_queue *queue;
1680 struct async *async;
1684 case ASYNC_TYPE_READ:
1685 if (!fd->read_q && !(fd->read_q = create_async_queue( fd ))) return NULL;
1688 case ASYNC_TYPE_WRITE:
1689 if (!fd->write_q && !(fd->write_q = create_async_queue( fd ))) return NULL;
1690 queue = fd->write_q;
1692 case ASYNC_TYPE_WAIT:
1693 if (!fd->wait_q && !(fd->wait_q = create_async_queue( fd ))) return NULL;
1700 if ((async = create_async( current, queue, data )))
1703 set_fd_events( fd, fd->fd_ops->get_poll_events( fd ) );
1704 else /* regular files are always ready for read and write */
1705 if (type != ASYNC_TYPE_WAIT) async_wake_up( queue, STATUS_ALERTED );
1710 void fd_async_wake_up( struct fd *fd, int type, unsigned int status )
1714 case ASYNC_TYPE_READ:
1715 async_wake_up( fd->read_q, status );
1717 case ASYNC_TYPE_WRITE:
1718 async_wake_up( fd->write_q, status );
1720 case ASYNC_TYPE_WAIT:
1721 async_wake_up( fd->wait_q, status );
1728 void default_fd_queue_async( struct fd *fd, const async_data_t *data, int type, int count )
1731 struct async *async;
1733 fd->fd_ops->get_file_info( fd, &flags );
1734 if (!(flags & (FD_FLAG_OVERLAPPED|FD_FLAG_TIMEOUT)))
1736 set_error( STATUS_INVALID_HANDLE );
1739 if ((async = fd_queue_async( fd, data, type, count )))
1741 release_object( async );
1742 set_error( STATUS_PENDING );
1746 void default_fd_cancel_async( struct fd *fd )
1748 async_wake_up( fd->read_q, STATUS_CANCELLED );
1749 async_wake_up( fd->write_q, STATUS_CANCELLED );
1750 async_wake_up( fd->wait_q, STATUS_CANCELLED );
1753 /* default flush() routine */
1754 void no_flush( struct fd *fd, struct event **event )
1756 set_error( STATUS_OBJECT_TYPE_MISMATCH );
1759 /* default get_file_info() routine */
1760 enum server_fd_type no_get_file_info( struct fd *fd, int *flags )
1763 return FD_TYPE_INVALID;
1766 /* default queue_async() routine */
1767 void no_queue_async( struct fd *fd, const async_data_t *data, int type, int count)
1769 set_error( STATUS_OBJECT_TYPE_MISMATCH );
1772 /* default cancel_async() routine */
1773 void no_cancel_async( struct fd *fd )
1775 set_error( STATUS_OBJECT_TYPE_MISMATCH );
1778 static inline int is_valid_mounted_device( struct stat *st )
1780 #if defined(linux) || defined(__sun__)
1781 return S_ISBLK( st->st_mode );
1783 /* disks are char devices on *BSD */
1784 return S_ISCHR( st->st_mode );
1788 /* close all Unix file descriptors on a device to allow unmounting it */
1789 static void unmount_device( struct fd *device_fd )
1793 struct device *device;
1794 struct inode *inode;
1796 int unix_fd = get_unix_fd( device_fd );
1798 if (unix_fd == -1) return;
1800 if (fstat( unix_fd, &st ) == -1 || !is_valid_mounted_device( &st ))
1802 set_error( STATUS_INVALID_PARAMETER );
1806 if (!(device = get_device( st.st_rdev, -1 ))) return;
1808 for (i = 0; i < INODE_HASH_SIZE; i++)
1810 LIST_FOR_EACH_ENTRY( inode, &device->inode_hash[i], struct inode, entry )
1812 LIST_FOR_EACH_ENTRY( fd, &inode->open, struct fd, inode_entry )
1816 inode_close_pending( inode, 0 );
1819 /* remove it from the hash table */
1820 list_remove( &device->entry );
1821 list_init( &device->entry );
1822 release_object( device );
1825 /* same as get_handle_obj but retrieve the struct fd associated to the object */
1826 static struct fd *get_handle_fd_obj( struct process *process, obj_handle_t handle,
1827 unsigned int access )
1829 struct fd *fd = NULL;
1832 if ((obj = get_handle_obj( process, handle, access, NULL )))
1834 fd = get_obj_fd( obj );
1835 release_object( obj );
1840 /* flush a file buffers */
1841 DECL_HANDLER(flush_file)
1843 struct fd *fd = get_handle_fd_obj( current->process, req->handle, 0 );
1844 struct event * event = NULL;
1848 fd->fd_ops->flush( fd, &event );
1851 reply->event = alloc_handle( current->process, event, SYNCHRONIZE, 0 );
1853 release_object( fd );
1857 /* open a file object */
1858 DECL_HANDLER(open_file_object)
1860 struct unicode_str name;
1861 struct directory *root = NULL;
1862 struct object *obj, *result;
1864 get_req_unicode_str( &name );
1865 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
1868 if ((obj = open_object_dir( root, &name, req->attributes, NULL )))
1870 if ((result = obj->ops->open_file( obj, req->access, req->sharing, req->options )))
1872 reply->handle = alloc_handle( current->process, result, req->access, req->attributes );
1873 release_object( result );
1875 release_object( obj );
1878 if (root) release_object( root );
1881 /* get a Unix fd to access a file */
1882 DECL_HANDLER(get_handle_fd)
1886 if ((fd = get_handle_fd_obj( current->process, req->handle, req->access )))
1888 reply->type = fd->fd_ops->get_file_info( fd, &reply->flags );
1889 if (reply->type != FD_TYPE_INVALID)
1891 if (is_fd_removable(fd)) reply->flags |= FD_FLAG_REMOVABLE;
1894 int unix_fd = get_unix_fd( fd );
1895 if (unix_fd != -1) send_client_fd( current->process, unix_fd, req->handle );
1898 else set_error( STATUS_OBJECT_TYPE_MISMATCH );
1899 release_object( fd );
1903 /* get ready to unmount a Unix device */
1904 DECL_HANDLER(unmount_device)
1908 if ((fd = get_handle_fd_obj( current->process, req->handle, 0 )))
1910 unmount_device( fd );
1911 release_object( fd );
1915 /* create / reschedule an async I/O */
1916 DECL_HANDLER(register_async)
1918 unsigned int access;
1923 case ASYNC_TYPE_READ:
1924 access = FILE_READ_DATA;
1926 case ASYNC_TYPE_WRITE:
1927 access = FILE_WRITE_DATA;
1930 set_error( STATUS_INVALID_PARAMETER );
1934 if ((fd = get_handle_fd_obj( current->process, req->handle, access )))
1936 fd->fd_ops->queue_async( fd, &req->async, req->type, req->count );
1937 release_object( fd );
1941 /* cancels all async I/O */
1942 DECL_HANDLER(cancel_async)
1944 struct fd *fd = get_handle_fd_obj( current->process, req->handle, 0 );
1947 /* Note: we don't kill the queued APC_ASYNC_IO on this thread because
1948 * NtCancelIoFile() will force the pending APC to be run. Since,
1949 * Windows only guarantees that the current thread will have no async
1950 * operation on the current fd when NtCancelIoFile returns, this shall
1953 fd->fd_ops->cancel_async( fd );
1954 release_object( fd );