* Server-side change notification management
*
* Copyright (C) 1998 Alexandre Julliard
+ * Copyright (C) 2006 Mike McCormack
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
+#include "config.h"
+#include "wine/port.h"
+
#include <assert.h>
+#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <limits.h>
+#include <dirent.h>
+#include <errno.h>
-#include "winerror.h"
-#include "winnt.h"
+#include "ntstatus.h"
+#define WIN32_NO_STATUS
+#include "windef.h"
+#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
+#include "process.h"
+#include "security.h"
+#include "winternl.h"
+
+/* dnotify support */
+
+#ifdef linux
+#ifndef F_NOTIFY
+#define F_NOTIFY 1026
+#define DN_ACCESS 0x00000001 /* File accessed */
+#define DN_MODIFY 0x00000002 /* File modified */
+#define DN_CREATE 0x00000004 /* File created */
+#define DN_DELETE 0x00000008 /* File removed */
+#define DN_RENAME 0x00000010 /* File renamed */
+#define DN_ATTRIB 0x00000020 /* File changed attributes */
+#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
+#endif
+#endif
+
+/* inotify support */
+
+#ifdef HAVE_SYS_INOTIFY_H
+#include <sys/inotify.h>
+#define USE_INOTIFY
+#elif defined(__linux__) && defined(__i386__)
+
+#define SYS_inotify_init 291
+#define SYS_inotify_add_watch 292
+#define SYS_inotify_rm_watch 293
+
+struct inotify_event {
+ int wd;
+ unsigned int mask;
+ unsigned int cookie;
+ unsigned int len;
+ char name[1];
+};
+
+#define IN_ACCESS 0x00000001
+#define IN_MODIFY 0x00000002
+#define IN_ATTRIB 0x00000004
+#define IN_CLOSE_WRITE 0x00000008
+#define IN_CLOSE_NOWRITE 0x00000010
+#define IN_OPEN 0x00000020
+#define IN_MOVED_FROM 0x00000040
+#define IN_MOVED_TO 0x00000080
+#define IN_CREATE 0x00000100
+#define IN_DELETE 0x00000200
+#define IN_DELETE_SELF 0x00000400
+
+#define IN_ISDIR 0x40000000
+
+static inline int inotify_init( void )
+{
+ return syscall( SYS_inotify_init );
+}
+
+static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
+{
+ return syscall( SYS_inotify_add_watch, fd, name, mask );
+}
+
+static inline int inotify_rm_watch( int fd, int wd )
+{
+ return syscall( SYS_inotify_rm_watch, fd, wd );
+}
+
+#define USE_INOTIFY
-struct change
+#endif
+
+struct inode;
+
+static void free_inode( struct inode *inode );
+
+static struct fd *inotify_fd;
+
+struct change_record {
+ struct list entry;
+ unsigned int cookie;
+ struct filesystem_event event;
+};
+
+struct dir
{
struct object obj; /* object header */
- int subtree; /* watch all the subtree */
- int filter; /* notification filter */
+ struct fd *fd; /* file descriptor to the directory */
+ mode_t mode; /* file stat.st_mode */
+ uid_t uid; /* file stat.st_uid */
+ struct list entry; /* entry in global change notifications list */
+ unsigned int filter; /* notification filter */
+ int notified; /* SIGIO counter */
+ int want_data; /* return change data */
+ int subtree; /* do we want to watch subdirectories? */
+ struct list change_records; /* data for the change */
+ struct list in_entry; /* entry in the inode dirs list */
+ struct inode *inode; /* inode of the associated directory */
};
-static void change_dump( struct object *obj, int verbose );
-static int change_signaled( struct object *obj, struct thread *thread );
-
-static const struct object_ops change_ops =
-{
- sizeof(struct change),
- change_dump,
- add_queue,
- remove_queue,
- change_signaled,
- no_satisfied,
- no_read_fd,
- no_write_fd,
- no_flush,
- no_get_file_info,
- no_destroy
+static struct fd *dir_get_fd( struct object *obj );
+static struct security_descriptor *dir_get_sd( struct object *obj );
+static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
+ unsigned int set_info );
+static void dir_dump( struct object *obj, int verbose );
+static void dir_destroy( struct object *obj );
+
+static const struct object_ops dir_ops =
+{
+ sizeof(struct dir), /* size */
+ dir_dump, /* dump */
+ no_get_type, /* get_type */
+ add_queue, /* add_queue */
+ remove_queue, /* remove_queue */
+ default_fd_signaled, /* signaled */
+ no_satisfied, /* satisfied */
+ no_signal, /* signal */
+ dir_get_fd, /* get_fd */
+ default_fd_map_access, /* map_access */
+ dir_get_sd, /* get_sd */
+ dir_set_sd, /* set_sd */
+ no_lookup_name, /* lookup_name */
+ no_open_file, /* open_file */
+ fd_close_handle, /* close_handle */
+ dir_destroy /* destroy */
+};
+
+static int dir_get_poll_events( struct fd *fd );
+static enum server_fd_type dir_get_fd_type( struct fd *fd );
+
+static const struct fd_ops dir_fd_ops =
+{
+ dir_get_poll_events, /* get_poll_events */
+ default_poll_event, /* poll_event */
+ no_flush, /* flush */
+ dir_get_fd_type, /* get_fd_type */
+ default_fd_ioctl, /* ioctl */
+ default_fd_queue_async, /* queue_async */
+ default_fd_reselect_async, /* reselect_async */
+ default_fd_cancel_async /* cancel_async */
};
+static struct list change_list = LIST_INIT(change_list);
+
+static void dnotify_adjust_changes( struct dir *dir )
+{
+#if defined(F_SETSIG) && defined(F_NOTIFY)
+ int fd = get_unix_fd( dir->fd );
+ unsigned int filter = dir->filter;
+ unsigned int val;
+ if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
+ return;
+
+ val = DN_MULTISHOT;
+ if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
+ val |= DN_RENAME | DN_DELETE | DN_CREATE;
+ if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
+ val |= DN_RENAME | DN_DELETE | DN_CREATE;
+ if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
+ val |= DN_ATTRIB;
+ if (filter & FILE_NOTIFY_CHANGE_SIZE)
+ val |= DN_MODIFY;
+ if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
+ val |= DN_MODIFY;
+ if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
+ val |= DN_ACCESS;
+ if (filter & FILE_NOTIFY_CHANGE_CREATION)
+ val |= DN_CREATE;
+ if (filter & FILE_NOTIFY_CHANGE_SECURITY)
+ val |= DN_ATTRIB;
+ fcntl( fd, F_NOTIFY, val );
+#endif
+}
+
+/* insert change in the global list */
+static inline void insert_change( struct dir *dir )
+{
+ sigset_t sigset;
+
+ sigemptyset( &sigset );
+ sigaddset( &sigset, SIGIO );
+ sigprocmask( SIG_BLOCK, &sigset, NULL );
+ list_add_head( &change_list, &dir->entry );
+ sigprocmask( SIG_UNBLOCK, &sigset, NULL );
+}
+
+/* remove change from the global list */
+static inline void remove_change( struct dir *dir )
+{
+ sigset_t sigset;
+
+ sigemptyset( &sigset );
+ sigaddset( &sigset, SIGIO );
+ sigprocmask( SIG_BLOCK, &sigset, NULL );
+ list_remove( &dir->entry );
+ sigprocmask( SIG_UNBLOCK, &sigset, NULL );
+}
+
+static void dir_dump( struct object *obj, int verbose )
+{
+ struct dir *dir = (struct dir *)obj;
+ assert( obj->ops == &dir_ops );
+ fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
+}
+
+/* enter here directly from SIGIO signal handler */
+void do_change_notify( int unix_fd )
+{
+ struct dir *dir;
-static struct change *create_change_notification( int subtree, int filter )
+ /* FIXME: this is O(n) ... probably can be improved */
+ LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
+ {
+ if (get_unix_fd( dir->fd ) != unix_fd) continue;
+ interlocked_xchg_add( &dir->notified, 1 );
+ break;
+ }
+}
+
+/* SIGIO callback, called synchronously with the poll loop */
+void sigio_callback(void)
{
- struct change *change;
- if ((change = alloc_object( &change_ops )))
+ struct dir *dir;
+
+ LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
- change->subtree = subtree;
- change->filter = filter;
+ if (interlocked_xchg( &dir->notified, 0 ))
+ fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_NOTIFY_ENUM_DIR );
}
- return change;
}
-static void change_dump( struct object *obj, int verbose )
+static struct fd *dir_get_fd( struct object *obj )
+{
+ struct dir *dir = (struct dir *)obj;
+ assert( obj->ops == &dir_ops );
+ return (struct fd *)grab_object( dir->fd );
+}
+
+static int get_dir_unix_fd( struct dir *dir )
+{
+ return get_unix_fd( dir->fd );
+}
+
+static struct security_descriptor *dir_get_sd( struct object *obj )
+{
+ struct dir *dir = (struct dir *)obj;
+ int unix_fd;
+ struct stat st;
+ struct security_descriptor *sd;
+ assert( obj->ops == &dir_ops );
+
+ unix_fd = get_dir_unix_fd( dir );
+
+ if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
+ return obj->sd;
+
+ /* mode and uid the same? if so, no need to re-generate security descriptor */
+ if (obj->sd &&
+ (st.st_mode & (S_IRWXU|S_IRWXO)) == (dir->mode & (S_IRWXU|S_IRWXO)) &&
+ (st.st_uid == dir->uid))
+ return obj->sd;
+
+ sd = mode_to_sd( st.st_mode,
+ security_unix_uid_to_sid( st.st_uid ),
+ token_get_primary_group( current->process->token ));
+ if (!sd) return obj->sd;
+
+ dir->mode = st.st_mode;
+ dir->uid = st.st_uid;
+ free( obj->sd );
+ obj->sd = sd;
+ return sd;
+}
+
+static int dir_set_sd( struct object *obj, const struct security_descriptor *sd,
+ unsigned int set_info )
{
- struct change *change = (struct change *)obj;
- assert( obj->ops == &change_ops );
- fprintf( stderr, "Change notification sub=%d filter=%08x\n",
- change->subtree, change->filter );
+ struct dir *dir = (struct dir *)obj;
+ const SID *owner;
+ struct stat st;
+ mode_t mode;
+ int unix_fd;
+
+ assert( obj->ops == &dir_ops );
+
+ unix_fd = get_dir_unix_fd( dir );
+
+ if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
+
+ if (set_info & OWNER_SECURITY_INFORMATION)
+ {
+ owner = sd_get_owner( sd );
+ if (!owner)
+ {
+ set_error( STATUS_INVALID_SECURITY_DESCR );
+ return 0;
+ }
+ if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
+ {
+ /* FIXME: get Unix uid and call fchown */
+ }
+ }
+ else if (obj->sd)
+ owner = sd_get_owner( obj->sd );
+ else
+ owner = token_get_user( current->process->token );
+
+ if (set_info & DACL_SECURITY_INFORMATION)
+ {
+ /* keep the bits that we don't map to access rights in the ACL */
+ mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
+ mode |= sd_to_mode( sd, owner );
+
+ if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
+ {
+ file_set_error();
+ return 0;
+ }
+ }
+ return 1;
}
-static int change_signaled( struct object *obj, struct thread *thread )
+static struct change_record *get_first_change_record( struct dir *dir )
{
-/* struct change *change = (struct change *)obj;*/
- assert( obj->ops == &change_ops );
- return 0; /* never signaled for now */
+ struct list *ptr = list_head( &dir->change_records );
+ if (!ptr) return NULL;
+ list_remove( ptr );
+ return LIST_ENTRY( ptr, struct change_record, entry );
}
-/* create a change notification */
-DECL_HANDLER(create_change_notification)
+static void dir_destroy( struct object *obj )
{
- struct change *change;
+ struct change_record *record;
+ struct dir *dir = (struct dir *)obj;
+ assert (obj->ops == &dir_ops);
+
+ if (dir->filter)
+ remove_change( dir );
+
+ if (dir->inode)
+ {
+ list_remove( &dir->in_entry );
+ free_inode( dir->inode );
+ }
+
+ while ((record = get_first_change_record( dir ))) free( record );
+
+ release_object( dir->fd );
+
+ if (inotify_fd && list_empty( &change_list ))
+ {
+ release_object( inotify_fd );
+ inotify_fd = NULL;
+ }
+}
+
+struct dir *get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
+{
+ return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
+}
+
+static int dir_get_poll_events( struct fd *fd )
+{
+ return 0;
+}
+
+static enum server_fd_type dir_get_fd_type( struct fd *fd )
+{
+ return FD_TYPE_DIR;
+}
+
+#ifdef USE_INOTIFY
+
+#define HASH_SIZE 31
+
+struct inode {
+ struct list ch_entry; /* entry in the children list */
+ struct list children; /* children of this inode */
+ struct inode *parent; /* parent of this inode */
+ struct list dirs; /* directory handles watching this inode */
+ struct list ino_entry; /* entry in the inode hash */
+ struct list wd_entry; /* entry in the watch descriptor hash */
+ dev_t dev; /* device number */
+ ino_t ino; /* device's inode number */
+ int wd; /* inotify's watch descriptor */
+ char *name; /* basename name of the inode */
+};
+
+static struct list inode_hash[ HASH_SIZE ];
+static struct list wd_hash[ HASH_SIZE ];
+
+static int inotify_add_dir( char *path, unsigned int filter );
+
+static struct inode *inode_from_wd( int wd )
+{
+ struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
+ struct inode *inode;
+
+ LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
+ if (inode->wd == wd)
+ return inode;
+
+ return NULL;
+}
+
+static inline struct list *get_hash_list( dev_t dev, ino_t ino )
+{
+ return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
+}
+
+static struct inode *find_inode( dev_t dev, ino_t ino )
+{
+ struct list *bucket = get_hash_list( dev, ino );
+ struct inode *inode;
+
+ LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
+ if (inode->ino == ino && inode->dev == dev)
+ return inode;
+
+ return NULL;
+}
+
+static struct inode *create_inode( dev_t dev, ino_t ino )
+{
+ struct inode *inode;
+
+ inode = malloc( sizeof *inode );
+ if (inode)
+ {
+ list_init( &inode->children );
+ list_init( &inode->dirs );
+ inode->ino = ino;
+ inode->dev = dev;
+ inode->wd = -1;
+ inode->parent = NULL;
+ inode->name = NULL;
+ list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
+ }
+ return inode;
+}
+
+static struct inode *get_inode( dev_t dev, ino_t ino )
+{
+ struct inode *inode;
+
+ inode = find_inode( dev, ino );
+ if (inode)
+ return inode;
+ return create_inode( dev, ino );
+}
+
+static void inode_set_wd( struct inode *inode, int wd )
+{
+ if (inode->wd != -1)
+ list_remove( &inode->wd_entry );
+ inode->wd = wd;
+ list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
+}
+
+static void inode_set_name( struct inode *inode, const char *name )
+{
+ free (inode->name);
+ inode->name = name ? strdup( name ) : NULL;
+}
+
+static void free_inode( struct inode *inode )
+{
+ int subtree = 0, watches = 0;
+ struct inode *tmp, *next;
+ struct dir *dir;
+
+ LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
+ {
+ subtree |= dir->subtree;
+ watches++;
+ }
+
+ if (!subtree && !inode->parent)
+ {
+ LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
+ struct inode, ch_entry )
+ {
+ assert( tmp != inode );
+ assert( tmp->parent == inode );
+ free_inode( tmp );
+ }
+ }
+
+ if (watches)
+ return;
+
+ if (inode->parent)
+ list_remove( &inode->ch_entry );
+
+ /* disconnect remaining children from the parent */
+ LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children, struct inode, ch_entry )
+ {
+ list_remove( &tmp->ch_entry );
+ tmp->parent = NULL;
+ }
+
+ if (inode->wd != -1)
+ {
+ inotify_rm_watch( get_unix_fd( inotify_fd ), inode->wd );
+ list_remove( &inode->wd_entry );
+ }
+ list_remove( &inode->ino_entry );
+
+ free( inode->name );
+ free( inode );
+}
+
+static struct inode *inode_add( struct inode *parent,
+ dev_t dev, ino_t ino, const char *name )
+{
+ struct inode *inode;
+
+ inode = get_inode( dev, ino );
+ if (!inode)
+ return NULL;
+
+ if (!inode->parent)
+ {
+ list_add_tail( &parent->children, &inode->ch_entry );
+ inode->parent = parent;
+ assert( inode != parent );
+ }
+ inode_set_name( inode, name );
+
+ return inode;
+}
+
+static struct inode *inode_from_name( struct inode *inode, const char *name )
+{
+ struct inode *i;
+
+ LIST_FOR_EACH_ENTRY( i, &inode->children, struct inode, ch_entry )
+ if (i->name && !strcmp( i->name, name ))
+ return i;
+ return NULL;
+}
+
+static int inotify_get_poll_events( struct fd *fd );
+static void inotify_poll_event( struct fd *fd, int event );
+
+static const struct fd_ops inotify_fd_ops =
+{
+ inotify_get_poll_events, /* get_poll_events */
+ inotify_poll_event, /* poll_event */
+ NULL, /* flush */
+ NULL, /* get_fd_type */
+ NULL, /* ioctl */
+ NULL, /* queue_async */
+ NULL, /* reselect_async */
+ NULL, /* cancel_async */
+};
+
+static int inotify_get_poll_events( struct fd *fd )
+{
+ return POLLIN;
+}
+
+static void inotify_do_change_notify( struct dir *dir, unsigned int action,
+ unsigned int cookie, const char *relpath )
+{
+ struct change_record *record;
+
+ assert( dir->obj.ops == &dir_ops );
+
+ if (dir->want_data)
+ {
+ size_t len = strlen(relpath);
+ record = malloc( offsetof(struct change_record, event.name[len]) );
+ if (!record)
+ return;
+
+ record->cookie = cookie;
+ record->event.action = action;
+ memcpy( record->event.name, relpath, len );
+ record->event.len = len;
+
+ list_add_tail( &dir->change_records, &record->entry );
+ }
+
+ fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
+}
+
+static unsigned int filter_from_event( struct inotify_event *ie )
+{
+ unsigned int filter = 0;
+
+ if (ie->mask & (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE))
+ filter |= FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME;
+ if (ie->mask & IN_MODIFY)
+ filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE;
+ if (ie->mask & IN_ATTRIB)
+ filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
+ if (ie->mask & IN_ACCESS)
+ filter |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
+ if (ie->mask & IN_CREATE)
+ filter |= FILE_NOTIFY_CHANGE_CREATION;
+
+ if (ie->mask & IN_ISDIR)
+ filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
+ else
+ filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
+
+ return filter;
+}
+
+/* scan up the parent directories for watches */
+static unsigned int filter_from_inode( struct inode *inode, int is_parent )
+{
+ unsigned int filter = 0;
+ struct dir *dir;
+
+ /* combine filters from parents watching subtrees */
+ while (inode)
+ {
+ LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
+ if (dir->subtree || !is_parent)
+ filter |= dir->filter;
+ is_parent = 1;
+ inode = inode->parent;
+ }
+
+ return filter;
+}
+
+static char *inode_get_path( struct inode *inode, int sz )
+{
+ struct list *head;
+ char *path;
+ int len;
+
+ if (!inode)
+ return NULL;
+
+ head = list_head( &inode->dirs );
+ if (head)
+ {
+ int unix_fd = get_unix_fd( LIST_ENTRY( head, struct dir, in_entry )->fd );
+ path = malloc ( 32 + sz );
+ if (path)
+ sprintf( path, "/proc/self/fd/%u/", unix_fd );
+ return path;
+ }
+
+ if (!inode->name)
+ return NULL;
+
+ len = strlen( inode->name );
+ path = inode_get_path( inode->parent, sz + len + 1 );
+ if (!path)
+ return NULL;
+
+ strcat( path, inode->name );
+ strcat( path, "/" );
+
+ return path;
+}
+
+static void inode_check_dir( struct inode *parent, const char *name )
+{
+ char *path;
+ unsigned int filter;
+ struct inode *inode;
+ struct stat st;
+ int wd = -1;
+
+ path = inode_get_path( parent, strlen(name) );
+ if (!path)
+ return;
+
+ strcat( path, name );
+
+ if (stat( path, &st ) < 0)
+ goto end;
+
+ filter = filter_from_inode( parent, 1 );
+ if (!filter)
+ goto end;
+
+ inode = inode_add( parent, st.st_dev, st.st_ino, name );
+ if (!inode || inode->wd != -1)
+ goto end;
+
+ wd = inotify_add_dir( path, filter );
+ if (wd != -1)
+ inode_set_wd( inode, wd );
+ else
+ free_inode( inode );
+
+end:
+ free( path );
+}
+
+static int prepend( char **path, const char *segment )
+{
+ int extra;
+ char *p;
+
+ extra = strlen( segment ) + 1;
+ if (*path)
+ {
+ int len = strlen( *path ) + 1;
+ p = realloc( *path, len + extra );
+ if (!p) return 0;
+ memmove( &p[ extra ], p, len );
+ p[ extra - 1 ] = '/';
+ memcpy( p, segment, extra - 1 );
+ }
+ else
+ {
+ p = malloc( extra );
+ if (!p) return 0;
+ memcpy( p, segment, extra );
+ }
+
+ *path = p;
+
+ return 1;
+}
+
+static void inotify_notify_all( struct inotify_event *ie )
+{
+ unsigned int filter, action;
+ struct inode *inode, *i;
+ char *path = NULL;
+ struct dir *dir;
+
+ inode = inode_from_wd( ie->wd );
+ if (!inode)
+ {
+ fprintf( stderr, "no inode matches %d\n", ie->wd);
+ return;
+ }
+
+ filter = filter_from_event( ie );
+
+ if (ie->mask & IN_CREATE)
+ {
+ if (ie->mask & IN_ISDIR)
+ inode_check_dir( inode, ie->name );
+
+ action = FILE_ACTION_ADDED;
+ }
+ else if (ie->mask & IN_DELETE)
+ action = FILE_ACTION_REMOVED;
+ else if (ie->mask & IN_MOVED_FROM)
+ action = FILE_ACTION_RENAMED_OLD_NAME;
+ else if (ie->mask & IN_MOVED_TO)
+ action = FILE_ACTION_RENAMED_NEW_NAME;
+ else
+ action = FILE_ACTION_MODIFIED;
+
+ /*
+ * Work our way up the inode hierarchy
+ * extending the relative path as we go
+ * and notifying all recursive watches.
+ */
+ if (!prepend( &path, ie->name ))
+ return;
+
+ for (i = inode; i; i = i->parent)
+ {
+ LIST_FOR_EACH_ENTRY( dir, &i->dirs, struct dir, in_entry )
+ if ((filter & dir->filter) && (i==inode || dir->subtree))
+ inotify_do_change_notify( dir, action, ie->cookie, path );
+
+ if (!i->name || !prepend( &path, i->name ))
+ break;
+ }
+
+ free( path );
+
+ if (ie->mask & IN_DELETE)
+ {
+ i = inode_from_name( inode, ie->name );
+ if (i)
+ free_inode( i );
+ }
+}
+
+static void inotify_poll_event( struct fd *fd, int event )
+{
+ int r, ofs, unix_fd;
+ char buffer[0x1000];
+ struct inotify_event *ie;
+
+ unix_fd = get_unix_fd( fd );
+ r = read( unix_fd, buffer, sizeof buffer );
+ if (r < 0)
+ {
+ fprintf(stderr,"inotify_poll_event(): inotify read failed!\n");
+ return;
+ }
+
+ for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
+ {
+ ie = (struct inotify_event*) &buffer[ofs];
+ if (!ie->len)
+ break;
+ ofs += offsetof( struct inotify_event, name[ie->len] );
+ if (ofs > r) break;
+ inotify_notify_all( ie );
+ }
+}
+
+static inline struct fd *create_inotify_fd( void )
+{
+ int unix_fd;
+
+ unix_fd = inotify_init();
+ if (unix_fd<0)
+ return NULL;
+ return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL, 0 );
+}
+
+static int map_flags( unsigned int filter )
+{
+ unsigned int mask;
+
+ /* always watch these so we can track subdirectories in recursive watches */
+ mask = (IN_MOVED_FROM | IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF);
+
+ if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
+ mask |= IN_ATTRIB;
+ if (filter & FILE_NOTIFY_CHANGE_SIZE)
+ mask |= IN_MODIFY;
+ if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
+ mask |= IN_MODIFY;
+ if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
+ mask |= IN_ACCESS;
+ if (filter & FILE_NOTIFY_CHANGE_SECURITY)
+ mask |= IN_ATTRIB;
+
+ return mask;
+}
+
+static int inotify_add_dir( char *path, unsigned int filter )
+{
+ int wd = inotify_add_watch( get_unix_fd( inotify_fd ),
+ path, map_flags( filter ) );
+ if (wd != -1)
+ set_fd_events( inotify_fd, POLLIN );
+ return wd;
+}
+
+static int init_inotify( void )
+{
+ int i;
+
+ if (inotify_fd)
+ return 1;
+
+ inotify_fd = create_inotify_fd();
+ if (!inotify_fd)
+ return 0;
+
+ for (i=0; i<HASH_SIZE; i++)
+ {
+ list_init( &inode_hash[i] );
+ list_init( &wd_hash[i] );
+ }
+
+ return 1;
+}
+
+static int inotify_adjust_changes( struct dir *dir )
+{
+ unsigned int filter;
+ struct inode *inode;
+ struct stat st;
+ char path[32];
+ int wd, unix_fd;
+
+ if (!inotify_fd)
+ return 0;
+
+ unix_fd = get_unix_fd( dir->fd );
+
+ inode = dir->inode;
+ if (!inode)
+ {
+ /* check if this fd is already being watched */
+ if (-1 == fstat( unix_fd, &st ))
+ return 0;
+
+ inode = get_inode( st.st_dev, st.st_ino );
+ if (!inode)
+ inode = create_inode( st.st_dev, st.st_ino );
+ if (!inode)
+ return 0;
+ list_add_tail( &inode->dirs, &dir->in_entry );
+ dir->inode = inode;
+ }
+
+ filter = filter_from_inode( inode, 0 );
+
+ sprintf( path, "/proc/self/fd/%u", unix_fd );
+ wd = inotify_add_dir( path, filter );
+ if (wd == -1) return 0;
+
+ inode_set_wd( inode, wd );
+
+ return 1;
+}
+
+static char *get_basename( const char *link )
+{
+ char *buffer, *name = NULL;
+ int r, n = 0x100;
+
+ while (1)
+ {
+ buffer = malloc( n );
+ if (!buffer) return NULL;
+
+ r = readlink( link, buffer, n );
+ if (r < 0)
+ break;
+
+ if (r < n)
+ {
+ name = buffer;
+ break;
+ }
+ free( buffer );
+ n *= 2;
+ }
+
+ if (name)
+ {
+ while (r > 0 && name[ r - 1 ] == '/' )
+ r--;
+ name[ r ] = 0;
+
+ name = strrchr( name, '/' );
+ if (name)
+ name = strdup( &name[1] );
+ }
+
+ free( buffer );
+ return name;
+}
+
+static int dir_add_to_existing_notify( struct dir *dir )
+{
+ struct inode *inode, *parent;
+ unsigned int filter = 0;
+ struct stat st, st_new;
+ char link[35], *name;
+ int wd, unix_fd;
+
+ if (!inotify_fd)
+ return 0;
+
+ unix_fd = get_unix_fd( dir->fd );
+
+ /* check if it's in the list of inodes we want to watch */
+ if (-1 == fstat( unix_fd, &st_new ))
+ return 0;
+ inode = find_inode( st_new.st_dev, st_new.st_ino );
+ if (inode)
+ return 0;
+
+ /* lookup the parent */
+ sprintf( link, "/proc/self/fd/%u/..", unix_fd );
+ if (-1 == stat( link, &st ))
+ return 0;
+
+ /*
+ * If there's no parent, stop. We could keep going adding
+ * ../ to the path until we hit the root of the tree or
+ * find a recursively watched ancestor.
+ * Assume it's too expensive to search up the tree for now.
+ */
+ parent = find_inode( st.st_dev, st.st_ino );
+ if (!parent)
+ return 0;
+
+ if (parent->wd == -1)
+ return 0;
+
+ filter = filter_from_inode( parent, 1 );
+ if (!filter)
+ return 0;
+
+ sprintf( link, "/proc/self/fd/%u", unix_fd );
+ name = get_basename( link );
+ if (!name)
+ return 0;
+ inode = inode_add( parent, st_new.st_dev, st_new.st_ino, name );
+ free( name );
+ if (!inode)
+ return 0;
+
+ /* Couldn't find this inode at the start of the function, must be new */
+ assert( inode->wd == -1 );
+
+ wd = inotify_add_dir( link, filter );
+ if (wd != -1)
+ inode_set_wd( inode, wd );
+
+ return 1;
+}
+
+#else
+
+static int init_inotify( void )
+{
+ return 0;
+}
+
+static int inotify_adjust_changes( struct dir *dir )
+{
+ return 0;
+}
+
+static void free_inode( struct inode *inode )
+{
+ assert( 0 );
+}
+
+static int dir_add_to_existing_notify( struct dir *dir )
+{
+ return 0;
+}
+
+#endif /* USE_INOTIFY */
+
+struct object *create_dir_obj( struct fd *fd, unsigned int access, mode_t mode )
+{
+ struct dir *dir;
+
+ dir = alloc_object( &dir_ops );
+ if (!dir)
+ return NULL;
+
+ list_init( &dir->change_records );
+ dir->filter = 0;
+ dir->notified = 0;
+ dir->want_data = 0;
+ dir->inode = NULL;
+ grab_object( fd );
+ dir->fd = fd;
+ dir->mode = mode;
+ dir->uid = ~(uid_t)0;
+ set_fd_user( fd, &dir_fd_ops, &dir->obj );
+
+ dir_add_to_existing_notify( dir );
+
+ return &dir->obj;
+}
+
+/* enable change notifications for a directory */
+DECL_HANDLER(read_directory_changes)
+{
+ struct dir *dir;
+ struct async *async;
+
+ if (!req->filter)
+ {
+ set_error(STATUS_INVALID_PARAMETER);
+ return;
+ }
+
+ dir = get_dir_obj( current->process, req->async.handle, 0 );
+ if (!dir)
+ return;
+
+ /* requests don't timeout */
+ if (!(async = fd_queue_async( dir->fd, &req->async, ASYNC_TYPE_WAIT ))) goto end;
+
+ /* assign it once */
+ if (!dir->filter)
+ {
+ init_inotify();
+ insert_change( dir );
+ dir->filter = req->filter;
+ dir->subtree = req->subtree;
+ dir->want_data = req->want_data;
+ }
+
+ /* if there's already a change in the queue, send it */
+ if (!list_empty( &dir->change_records ))
+ fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
+
+ /* setup the real notification */
+ if (!inotify_adjust_changes( dir ))
+ dnotify_adjust_changes( dir );
+
+ release_object( async );
+ set_error(STATUS_PENDING);
+
+end:
+ release_object( dir );
+}
+
+DECL_HANDLER(read_change)
+{
+ struct change_record *record, *next;
+ struct dir *dir;
+ struct list events;
+ char *data, *event;
+ int size = 0;
+
+ dir = get_dir_obj( current->process, req->handle, 0 );
+ if (!dir)
+ return;
+
+ list_init( &events );
+ list_move_tail( &events, &dir->change_records );
+ release_object( dir );
+
+ if (list_empty( &events ))
+ {
+ set_error( STATUS_NO_DATA_DETECTED );
+ return;
+ }
+
+ LIST_FOR_EACH_ENTRY( record, &events, struct change_record, entry )
+ {
+ size += (offsetof(struct filesystem_event, name[record->event.len])
+ + sizeof(int)-1) / sizeof(int) * sizeof(int);
+ }
+
+ if (size > get_reply_max_size())
+ set_error( STATUS_BUFFER_TOO_SMALL );
+ else if ((data = mem_alloc( size )) != NULL)
+ {
+ event = data;
+ LIST_FOR_EACH_ENTRY( record, &events, struct change_record, entry )
+ {
+ data_size_t len = offsetof( struct filesystem_event, name[record->event.len] );
+
+ /* FIXME: rename events are sometimes reported as delete/create */
+ if (record->event.action == FILE_ACTION_RENAMED_OLD_NAME)
+ {
+ struct list *elem = list_next( &events, &record->entry );
+ if (elem)
+ next = LIST_ENTRY(elem, struct change_record, entry);
+
+ if (elem && next->cookie == record->cookie)
+ next->cookie = 0;
+ else
+ record->event.action = FILE_ACTION_REMOVED;
+ }
+ else if (record->event.action == FILE_ACTION_RENAMED_NEW_NAME && record->cookie)
+ record->event.action = FILE_ACTION_ADDED;
+
+ memcpy( event, &record->event, len );
+ event += len;
+ if (len % sizeof(int))
+ {
+ memset( event, 0, sizeof(int) - len % sizeof(int) );
+ event += sizeof(int) - len % sizeof(int);
+ }
+ }
+ set_reply_data_ptr( data, size );
+ }
- req->handle = -1;
- if ((change = create_change_notification( req->subtree, req->filter )))
+ LIST_FOR_EACH_ENTRY_SAFE( record, next, &events, struct change_record, entry )
{
- req->handle = alloc_handle( current->process, change,
- STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE, 0 );
- release_object( change );
+ list_remove( &record->entry );
+ free( record );
}
}