1170 lines
29 KiB
C
1170 lines
29 KiB
C
/*
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* Server-side change notification management
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*
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* Copyright (C) 1998 Alexandre Julliard
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* Copyright (C) 2006 Mike McCormack
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <limits.h>
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#include <dirent.h>
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#include <errno.h>
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#ifdef HAVE_SYS_ERRNO_H
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#include <sys/errno.h>
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#endif
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "file.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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#include "winternl.h"
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/* dnotify support */
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#ifdef linux
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#ifndef F_NOTIFY
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#define F_NOTIFY 1026
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#define DN_ACCESS 0x00000001 /* File accessed */
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#define DN_MODIFY 0x00000002 /* File modified */
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#define DN_CREATE 0x00000004 /* File created */
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#define DN_DELETE 0x00000008 /* File removed */
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#define DN_RENAME 0x00000010 /* File renamed */
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#define DN_ATTRIB 0x00000020 /* File changed attibutes */
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#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
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#endif
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#endif
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/* inotify support */
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#if defined(__linux__) && defined(__i386__)
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#define SYS_inotify_init 291
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#define SYS_inotify_add_watch 292
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#define SYS_inotify_rm_watch 293
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struct inotify_event {
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int wd;
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unsigned int mask;
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unsigned int cookie;
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unsigned int len;
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char name[1];
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};
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#define IN_ACCESS 0x00000001
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#define IN_MODIFY 0x00000002
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#define IN_ATTRIB 0x00000004
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#define IN_CLOSE_WRITE 0x00000008
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#define IN_CLOSE_NOWRITE 0x00000010
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#define IN_OPEN 0x00000020
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#define IN_MOVED_FROM 0x00000040
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#define IN_MOVED_TO 0x00000080
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#define IN_CREATE 0x00000100
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#define IN_DELETE 0x00000200
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#define IN_DELETE_SELF 0x00000400
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static inline int inotify_init( void )
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{
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int ret;
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__asm__ __volatile__( "int $0x80"
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: "=a" (ret)
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: "0" (SYS_inotify_init));
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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static inline int inotify_add_watch( int fd, const char *name, unsigned int mask )
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{
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int ret;
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__asm__ __volatile__( "pushl %%ebx;\n\t"
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"movl %2,%%ebx;\n\t"
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"int $0x80;\n\t"
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"popl %%ebx"
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: "=a" (ret) : "0" (SYS_inotify_add_watch),
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"r" (fd), "c" (name), "d" (mask) );
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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static inline int inotify_remove_watch( int fd, int wd )
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{
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int ret;
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__asm__ __volatile__( "pushl %%ebx;\n\t"
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"movl %2,%%ebx;\n\t"
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"int $0x80;\n\t"
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"popl %%ebx"
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: "=a" (ret) : "0" (SYS_inotify_rm_watch),
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"r" (fd), "c" (wd) );
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if (ret<0) { errno = -ret; ret = -1; }
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return ret;
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}
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#define USE_INOTIFY
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#endif
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struct inode;
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static void free_inode( struct inode *inode );
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static struct fd *inotify_fd;
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struct change_record {
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struct list entry;
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int action;
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int len;
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char name[1];
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};
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struct dir
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{
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor to the directory */
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struct list entry; /* entry in global change notifications list */
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struct event *event;
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unsigned int filter; /* notification filter */
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int notified; /* SIGIO counter */
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int want_data; /* return change data */
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long signaled; /* the file changed */
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int subtree; /* do we want to watch subdirectories? */
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struct list change_q; /* change readers */
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struct list change_records; /* data for the change */
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struct list in_entry; /* entry in the inode dirs list */
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struct inode *inode; /* inode of the associated directory */
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};
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static struct fd *dir_get_fd( struct object *obj );
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static unsigned int dir_map_access( struct object *obj, unsigned int access );
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static void dir_dump( struct object *obj, int verbose );
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static void dir_destroy( struct object *obj );
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static int dir_signaled( struct object *obj, struct thread *thread );
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static const struct object_ops dir_ops =
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{
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sizeof(struct dir), /* size */
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dir_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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dir_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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dir_get_fd, /* get_fd */
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dir_map_access, /* map_access */
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no_lookup_name, /* lookup_name */
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no_close_handle, /* close_handle */
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dir_destroy /* destroy */
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};
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static int dir_get_poll_events( struct fd *fd );
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static int dir_get_info( struct fd *fd );
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static void dir_cancel_async( struct fd *fd );
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static const struct fd_ops dir_fd_ops =
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{
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dir_get_poll_events, /* get_poll_events */
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default_poll_event, /* poll_event */
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no_flush, /* flush */
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dir_get_info, /* get_file_info */
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default_fd_queue_async, /* queue_async */
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dir_cancel_async /* cancel_async */
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};
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static struct list change_list = LIST_INIT(change_list);
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static void dnotify_adjust_changes( struct dir *dir )
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{
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#if defined(F_SETSIG) && defined(F_NOTIFY)
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int fd = get_unix_fd( dir->fd );
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unsigned int filter = dir->filter;
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unsigned int val;
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if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
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return;
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val = DN_MULTISHOT;
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if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
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val |= DN_RENAME | DN_DELETE | DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
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val |= DN_ATTRIB;
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if (filter & FILE_NOTIFY_CHANGE_SIZE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
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val |= DN_MODIFY;
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if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
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val |= DN_ACCESS;
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if (filter & FILE_NOTIFY_CHANGE_CREATION)
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val |= DN_CREATE;
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if (filter & FILE_NOTIFY_CHANGE_SECURITY)
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val |= DN_ATTRIB;
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fcntl( fd, F_NOTIFY, val );
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#endif
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}
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/* insert change in the global list */
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static inline void insert_change( struct dir *dir )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_add_head( &change_list, &dir->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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/* remove change from the global list */
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static inline void remove_change( struct dir *dir )
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{
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sigset_t sigset;
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sigemptyset( &sigset );
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sigaddset( &sigset, SIGIO );
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sigprocmask( SIG_BLOCK, &sigset, NULL );
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list_remove( &dir->entry );
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sigprocmask( SIG_UNBLOCK, &sigset, NULL );
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}
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static void dir_dump( struct object *obj, int verbose )
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{
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struct dir *dir = (struct dir *)obj;
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assert( obj->ops == &dir_ops );
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fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
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dir->fd, dir->event, dir->filter );
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}
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static int dir_signaled( struct object *obj, struct thread *thread )
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{
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struct dir *dir = (struct dir *)obj;
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assert (obj->ops == &dir_ops);
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return (dir->event == NULL) && dir->signaled;
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}
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/* enter here directly from SIGIO signal handler */
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void do_change_notify( int unix_fd )
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{
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struct dir *dir;
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/* FIXME: this is O(n) ... probably can be improved */
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
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{
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if (get_unix_fd( dir->fd ) != unix_fd) continue;
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interlocked_xchg_add( &dir->notified, 1 );
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break;
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}
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}
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static void dir_signal_changed( struct dir *dir )
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{
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if (dir->event)
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set_event( dir->event );
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else
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wake_up( &dir->obj, 0 );
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}
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/* SIGIO callback, called synchronously with the poll loop */
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void sigio_callback(void)
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{
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struct dir *dir;
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
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{
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long count = interlocked_xchg( &dir->notified, 0 );
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if (count)
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{
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dir->signaled += count;
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if (dir->signaled == count) /* was it 0? */
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dir_signal_changed( dir );
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}
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}
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}
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static struct fd *dir_get_fd( struct object *obj )
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{
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struct dir *dir = (struct dir *)obj;
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assert( obj->ops == &dir_ops );
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return (struct fd *)grab_object( dir->fd );
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}
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static unsigned int dir_map_access( struct object *obj, unsigned int access )
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{
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if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
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if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
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if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
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if (access & GENERIC_ALL) access |= FILE_ALL_ACCESS;
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return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
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}
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static struct change_record *get_first_change_record( struct dir *dir )
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{
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struct list *ptr = list_head( &dir->change_records );
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if (!ptr) return NULL;
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list_remove( ptr );
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return LIST_ENTRY( ptr, struct change_record, entry );
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}
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static void dir_destroy( struct object *obj )
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{
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struct change_record *record;
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struct dir *dir = (struct dir *)obj;
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assert (obj->ops == &dir_ops);
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if (dir->filter)
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remove_change( dir );
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if (dir->inode)
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{
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list_remove( &dir->in_entry );
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free_inode( dir->inode );
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}
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async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
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while ((record = get_first_change_record( dir ))) free( record );
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if (dir->event)
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{
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set_event( dir->event );
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release_object( dir->event );
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}
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release_object( dir->fd );
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if (inotify_fd && list_empty( &change_list ))
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{
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release_object( inotify_fd );
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inotify_fd = NULL;
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}
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}
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static struct dir *
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get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
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}
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static int dir_get_poll_events( struct fd *fd )
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{
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return 0;
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}
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static int dir_get_info( struct fd *fd )
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{
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return 0;
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}
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static void dir_cancel_async( struct fd *fd )
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{
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struct dir *dir = (struct dir *) get_fd_user( fd );
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async_terminate_queue( &dir->change_q, STATUS_CANCELLED );
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}
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#ifdef USE_INOTIFY
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#define HASH_SIZE 31
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struct inode {
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struct list ch_entry; /* entry in the children list */
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struct list children; /* children of this inode */
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struct inode *parent; /* parent of this inode */
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struct list dirs; /* directory handles watching this inode */
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struct list ino_entry; /* entry in the inode hash */
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struct list wd_entry; /* entry in the watch descriptor hash */
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dev_t dev; /* device number */
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ino_t ino; /* device's inode number */
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int wd; /* inotify's watch descriptor */
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char *name; /* basename name of the inode */
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};
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struct list inode_hash[ HASH_SIZE ];
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struct list wd_hash[ HASH_SIZE ];
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static int inotify_add_dir( char *path, unsigned int filter );
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static struct inode *inode_from_wd( int wd )
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{
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struct list *bucket = &wd_hash[ wd % HASH_SIZE ];
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struct inode *inode;
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LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, wd_entry )
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if (inode->wd == wd)
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return inode;
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return NULL;
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}
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static inline struct list *get_hash_list( dev_t dev, ino_t ino )
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{
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return &inode_hash[ (ino ^ dev) % HASH_SIZE ];
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}
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static struct inode *find_inode( dev_t dev, ino_t ino )
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{
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struct list *bucket = get_hash_list( dev, ino );
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struct inode *inode;
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LIST_FOR_EACH_ENTRY( inode, bucket, struct inode, ino_entry )
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if (inode->ino == ino && inode->dev == dev)
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return inode;
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return NULL;
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}
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static struct inode *create_inode( dev_t dev, ino_t ino )
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{
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struct inode *inode;
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inode = malloc( sizeof *inode );
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if (inode)
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{
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list_init( &inode->children );
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list_init( &inode->dirs );
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inode->ino = ino;
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inode->dev = dev;
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inode->wd = -1;
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inode->parent = NULL;
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inode->name = NULL;
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list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
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}
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return inode;
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}
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static struct inode *get_inode( dev_t dev, ino_t ino )
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{
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struct inode *inode;
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inode = find_inode( dev, ino );
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if (inode)
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return inode;
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return create_inode( dev, ino );
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}
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static void inode_set_wd( struct inode *inode, int wd )
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{
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if (inode->wd != -1)
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list_remove( &inode->wd_entry );
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inode->wd = wd;
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list_add_tail( &wd_hash[ wd % HASH_SIZE ], &inode->wd_entry );
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}
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static void inode_set_name( struct inode *inode, const char *name )
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{
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if (inode->name)
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free (inode->name);
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inode->name = name ? strdup( name ) : NULL;
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}
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static void free_inode( struct inode *inode )
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{
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int subtree = 0, watches = 0;
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struct dir *dir;
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LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
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{
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subtree |= dir->subtree;
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watches++;
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}
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if (!subtree && !inode->parent)
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{
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struct inode *tmp, *next;
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LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
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struct inode, ch_entry )
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{
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assert( tmp != inode );
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assert( tmp->parent == inode );
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free_inode( tmp );
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}
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}
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if (watches)
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return;
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if (inode->parent)
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list_remove( &inode->ch_entry );
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if (inode->wd != -1)
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{
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inotify_remove_watch( get_unix_fd( inotify_fd ), inode->wd );
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list_remove( &inode->wd_entry );
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}
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list_remove( &inode->ino_entry );
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free( inode->name );
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free( inode );
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}
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static struct inode *inode_add( struct inode *parent,
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dev_t dev, ino_t ino, const char *name )
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{
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struct inode *inode;
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inode = get_inode( dev, ino );
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if (!inode)
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return NULL;
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if (!inode->parent)
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{
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list_add_tail( &parent->children, &inode->ch_entry );
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inode->parent = parent;
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assert( inode != parent );
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}
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inode_set_name( inode, name );
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return inode;
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}
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|
|
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 int inotify_get_info( struct fd *fd );
|
|
|
|
static const struct fd_ops inotify_fd_ops =
|
|
{
|
|
inotify_get_poll_events, /* get_poll_events */
|
|
inotify_poll_event, /* poll_event */
|
|
no_flush, /* flush */
|
|
inotify_get_info, /* get_file_info */
|
|
default_fd_queue_async, /* queue_async */
|
|
default_fd_cancel_async, /* 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,
|
|
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, name[len]) );
|
|
if (!record)
|
|
return;
|
|
|
|
record->action = action;
|
|
memcpy( record->name, relpath, len );
|
|
record->len = len;
|
|
|
|
list_add_tail( &dir->change_records, &record->entry );
|
|
}
|
|
|
|
if (!list_empty( &dir->change_q ))
|
|
async_terminate_head( &dir->change_q, STATUS_ALERTED );
|
|
else
|
|
{
|
|
dir->signaled++;
|
|
dir_signal_changed( dir );
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
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 int inode_check_dir( struct inode *parent, const char *name )
|
|
{
|
|
char *path;
|
|
unsigned int filter;
|
|
struct inode *inode;
|
|
struct stat st;
|
|
int wd = -1, r = -1;
|
|
|
|
path = inode_get_path( parent, strlen(name) );
|
|
if (!path)
|
|
return r;
|
|
|
|
strcat( path, name );
|
|
|
|
r = stat( path, &st );
|
|
if (r < 0) goto end;
|
|
|
|
if (!S_ISDIR(st.st_mode))
|
|
{
|
|
r = 0;
|
|
goto end;
|
|
}
|
|
|
|
r = 1;
|
|
|
|
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 );
|
|
return r;
|
|
}
|
|
|
|
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)
|
|
{
|
|
switch (inode_check_dir( inode, ie->name ))
|
|
{
|
|
case 1:
|
|
filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
|
|
break;
|
|
case 0:
|
|
filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;
|
|
break;
|
|
default:
|
|
break;
|
|
/* Maybe the file disappeared before we could check it? */
|
|
}
|
|
action = FILE_ACTION_ADDED;
|
|
}
|
|
else if (ie->mask & IN_DELETE)
|
|
action = FILE_ACTION_REMOVED;
|
|
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, 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 int inotify_get_info( struct fd *fd )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
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 );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
struct dir *dir;
|
|
|
|
dir = alloc_object( &dir_ops );
|
|
if (!dir)
|
|
return NULL;
|
|
|
|
list_init( &dir->change_q );
|
|
list_init( &dir->change_records );
|
|
dir->event = NULL;
|
|
dir->filter = 0;
|
|
dir->notified = 0;
|
|
dir->signaled = 0;
|
|
dir->want_data = 0;
|
|
dir->inode = NULL;
|
|
grab_object( fd );
|
|
dir->fd = fd;
|
|
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 event *event = NULL;
|
|
struct dir *dir;
|
|
|
|
if (!req->filter)
|
|
{
|
|
set_error(STATUS_INVALID_PARAMETER);
|
|
return;
|
|
}
|
|
|
|
dir = get_dir_obj( current->process, req->handle, 0 );
|
|
if (!dir)
|
|
return;
|
|
|
|
/* possibly send changes through an event flag */
|
|
if (req->event)
|
|
{
|
|
event = get_event_obj( current->process, req->event, EVENT_MODIFY_STATE );
|
|
if (!event)
|
|
goto end;
|
|
}
|
|
|
|
/* discard the current data, and move onto the next event */
|
|
if (dir->event) release_object( dir->event );
|
|
dir->event = event;
|
|
|
|
/* requests don't timeout */
|
|
if ( req->io_apc && !create_async( current, NULL, &dir->change_q,
|
|
req->io_apc, req->io_user, req->io_sb ))
|
|
return;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* remove any notifications */
|
|
if (dir->signaled>0)
|
|
dir->signaled--;
|
|
|
|
/* clear the event */
|
|
if (event)
|
|
reset_event( event );
|
|
|
|
/* setup the real notification */
|
|
if (!inotify_adjust_changes( dir ))
|
|
dnotify_adjust_changes( dir );
|
|
|
|
set_error(STATUS_PENDING);
|
|
|
|
end:
|
|
release_object( dir );
|
|
}
|
|
|
|
DECL_HANDLER(read_change)
|
|
{
|
|
struct change_record *record;
|
|
struct dir *dir;
|
|
|
|
dir = get_dir_obj( current->process, req->handle, 0 );
|
|
if (!dir)
|
|
return;
|
|
|
|
if ((record = get_first_change_record( dir )) != NULL)
|
|
{
|
|
reply->action = record->action;
|
|
set_reply_data( record->name, record->len );
|
|
free( record );
|
|
}
|
|
else
|
|
set_error( STATUS_NO_DATA_DETECTED );
|
|
|
|
/* now signal it */
|
|
dir->signaled++;
|
|
dir_signal_changed( dir );
|
|
|
|
release_object( dir );
|
|
}
|