change.c 33.8 KB
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/*
 * Server-side change notification management
 *
 * Copyright (C) 1998 Alexandre Julliard
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 * Copyright (C) 2006 Mike McCormack
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 *
 * 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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

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#include "config.h"
#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>
#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>
#include <limits.h>
#include <dirent.h>
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#include <errno.h>
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#ifdef HAVE_POLL_H
# include <poll.h>
#endif
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#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#endif
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#include "ntstatus.h"
#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"
#include "thread.h"
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#include "request.h"
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#include "process.h"
#include "security.h"
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#include "winternl.h"
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/* dnotify support */

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#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 */
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#define DN_ATTRIB       0x00000020      /* File changed attributes */
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#define DN_MULTISHOT    0x80000000      /* Don't remove notifier */
#endif
#endif

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/* inotify support */

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struct inode;

static void free_inode( struct inode *inode );

static struct fd *inotify_fd;

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struct change_record {
    struct list entry;
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    unsigned int cookie;
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    struct filesystem_event event;
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};

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struct dir
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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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    mode_t         mode;     /* file stat.st_mode */
    uid_t          uid;      /* file stat.st_uid */
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    struct list    entry;    /* entry in global change notifications list */
    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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    int            subtree;  /* do we want to watch subdirectories? */
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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 */
    struct inode  *inode;    /* inode of the associated directory */
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    struct process *client_process;  /* client process that has a cache for this directory */
    int             client_entry;    /* entry in client process cache */
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};

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static struct fd *dir_get_fd( struct object *obj );
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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 );
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static void dir_dump( struct object *obj, int verbose );
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static struct object_type *dir_get_type( struct object *obj );
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static int dir_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
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static void dir_destroy( struct object *obj );
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static const struct object_ops dir_ops =
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{
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    sizeof(struct dir),       /* size */
    dir_dump,                 /* dump */
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    dir_get_type,             /* get_type */
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    add_queue,                /* add_queue */
    remove_queue,             /* remove_queue */
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    default_fd_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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    default_fd_map_access,    /* map_access */
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    dir_get_sd,               /* get_sd */
    dir_set_sd,               /* set_sd */
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    no_lookup_name,           /* lookup_name */
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    no_link_name,             /* link_name */
    NULL,                     /* unlink_name */
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    no_open_file,             /* open_file */
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    no_kernel_obj_list,       /* get_kernel_obj_list */
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    dir_close_handle,         /* close_handle */
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    dir_destroy               /* destroy */
};

static int dir_get_poll_events( struct fd *fd );
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static enum server_fd_type dir_get_fd_type( struct fd *fd );
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static const struct fd_ops dir_fd_ops =
{
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    dir_get_poll_events,         /* get_poll_events */
    default_poll_event,          /* poll_event */
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    dir_get_fd_type,             /* get_fd_type */
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    no_fd_read,                  /* read */
    no_fd_write,                 /* write */
    no_fd_flush,                 /* flush */
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    default_fd_get_file_info,    /* get_file_info */
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    no_fd_get_volume_info,       /* get_volume_info */
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    default_fd_ioctl,            /* ioctl */
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    default_fd_queue_async,      /* queue_async */
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    default_fd_reselect_async    /* reselect_async */
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};

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static struct list change_list = LIST_INIT(change_list);

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/* per-process structure to keep track of cache entries on the client size */
struct dir_cache
{
    unsigned int  size;
    unsigned int  count;
    unsigned char state[1];
};

enum dir_cache_state
{
    DIR_CACHE_STATE_FREE,
    DIR_CACHE_STATE_INUSE,
    DIR_CACHE_STATE_RELEASED
};

/* return an array of cache entries that can be freed on the client side */
static int *get_free_dir_cache_entries( struct process *process, data_size_t *size )
{
    int *ret;
    struct dir_cache *cache = process->dir_cache;
    unsigned int i, j, count;

    if (!cache) return NULL;
    for (i = count = 0; i < cache->count && count < *size / sizeof(*ret); i++)
        if (cache->state[i] == DIR_CACHE_STATE_RELEASED) count++;
    if (!count) return NULL;

    if ((ret = malloc( count * sizeof(*ret) )))
    {
        for (i = j = 0; j < count; i++)
        {
            if (cache->state[i] != DIR_CACHE_STATE_RELEASED) continue;
            cache->state[i] = DIR_CACHE_STATE_FREE;
            ret[j++] = i;
        }
        *size = count * sizeof(*ret);
    }
    return ret;
}

/* allocate a new client-side directory cache entry */
static int alloc_dir_cache_entry( struct dir *dir, struct process *process )
{
    unsigned int i = 0;
    struct dir_cache *cache = process->dir_cache;

    if (cache)
        for (i = 0; i < cache->count; i++)
            if (cache->state[i] == DIR_CACHE_STATE_FREE) goto found;

    if (!cache || cache->count == cache->size)
    {
        unsigned int size = cache ? cache->size * 2 : 256;
        if (!(cache = realloc( cache, offsetof( struct dir_cache, state[size] ))))
        {
            set_error( STATUS_NO_MEMORY );
            return -1;
        }
        process->dir_cache = cache;
        cache->size = size;
    }
    cache->count = i + 1;

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    cache->state[i] = DIR_CACHE_STATE_INUSE;
    return i;
}

/* release a directory cache entry; it will be freed on the client side on the next cache request */
static void release_dir_cache_entry( struct dir *dir )
{
    struct dir_cache *cache;

    if (!dir->client_process) return;
    cache = dir->client_process->dir_cache;
    cache->state[dir->client_entry] = DIR_CACHE_STATE_RELEASED;
    release_object( dir->client_process );
    dir->client_process = NULL;
}

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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 );
    unsigned int filter = dir->filter;
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    unsigned int val;
    if ( 0 > fcntl( fd, F_SETSIG, SIGIO) )
        return;

    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;
    fcntl( fd, F_NOTIFY, val );
#endif
}

/* insert change in the global list */
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static inline void insert_change( struct dir *dir )
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{
    sigset_t sigset;

    sigemptyset( &sigset );
    sigaddset( &sigset, SIGIO );
    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 );
}

/* remove change from the global list */
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static inline void remove_change( struct dir *dir )
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{
    sigset_t sigset;

    sigemptyset( &sigset );
    sigaddset( &sigset, SIGIO );
    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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static void dir_dump( struct object *obj, int verbose )
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{
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    struct dir *dir = (struct dir *)obj;
    assert( obj->ops == &dir_ops );
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    fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
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}

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static struct object_type *dir_get_type( struct object *obj )
{
    static const WCHAR name[] = {'F','i','l','e'};
    static const struct unicode_str str = { name, sizeof(name) };
    return get_object_type( &str );
}

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/* enter here directly from SIGIO signal handler */
void do_change_notify( int unix_fd )
{
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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;
        interlocked_xchg_add( &dir->notified, 1 );
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        break;
    }
}

/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
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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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        if (interlocked_xchg( &dir->notified, 0 ))
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            fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
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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;
    assert( obj->ops == &dir_ops );
    return (struct fd *)grab_object( dir->fd );
}
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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 dir *dir = (struct dir *)obj;
    const SID *owner;
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    struct stat st;
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    mode_t mode;
    int unix_fd;

    assert( obj->ops == &dir_ops );

    unix_fd = get_dir_unix_fd( dir );

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    if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
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    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 */
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        mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
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        mode |= sd_to_mode( sd, owner );

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        if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
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        {
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            file_set_error();
            return 0;
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        }
    }
    return 1;
}

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static struct change_record *get_first_change_record( struct dir *dir )
{
    struct list *ptr = list_head( &dir->change_records );
    if (!ptr) return NULL;
    list_remove( ptr );
    return LIST_ENTRY( ptr, struct change_record, entry );
}

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static int dir_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
{
    struct dir *dir = (struct dir *)obj;

    if (!fd_close_handle( obj, process, handle )) return 0;
    if (obj->handle_count == 1) release_dir_cache_entry( dir ); /* closing last handle, release cache */
    return 1;  /* ok to close */
}

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static void dir_destroy( struct object *obj )
{
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    struct change_record *record;
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    struct dir *dir = (struct dir *)obj;
    assert (obj->ops == &dir_ops);
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    if (dir->filter)
        remove_change( dir );

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    if (dir->inode)
    {
        list_remove( &dir->in_entry );
        free_inode( dir->inode );
    }
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    while ((record = get_first_change_record( dir ))) free( record );

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    release_dir_cache_entry( dir );
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    release_object( dir->fd );
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    if (inotify_fd && list_empty( &change_list ))
    {
        release_object( inotify_fd );
        inotify_fd = NULL;
    }
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}

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struct dir *get_dir_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
    return (struct dir *)get_handle_obj( process, handle, access, &dir_ops );
}

static int dir_get_poll_events( struct fd *fd )
{
    return 0;
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}

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static enum server_fd_type dir_get_fd_type( struct fd *fd )
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{
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    return FD_TYPE_DIR;
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}

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#ifdef HAVE_SYS_INOTIFY_H
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#define HASH_SIZE 31

struct inode {
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    struct list ch_entry;    /* entry in the children list */
    struct list children;    /* children of this inode */
    struct inode *parent;    /* parent of this inode */
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    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 */
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    char *name;              /* basename name of the inode */
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};

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static struct list inode_hash[ HASH_SIZE ];
static 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 )
{
    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 ];
}

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static struct inode *find_inode( dev_t dev, ino_t ino )
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{
    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)
    {
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        list_init( &inode->children );
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        list_init( &inode->dirs );
        inode->ino = ino;
        inode->dev = dev;
        inode->wd = -1;
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        inode->parent = NULL;
        inode->name = NULL;
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        list_add_tail( get_hash_list( dev, ino ), &inode->ino_entry );
    }
    return inode;
}

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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 );
}

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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 );
}

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static void inode_set_name( struct inode *inode, const char *name )
{
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    free (inode->name);
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    inode->name = name ? strdup( name ) : NULL;
}

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static void free_inode( struct inode *inode )
{
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    int subtree = 0, watches = 0;
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    struct inode *tmp, *next;
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    struct dir *dir;

    LIST_FOR_EACH_ENTRY( dir, &inode->dirs, struct dir, in_entry )
    {
        subtree |= dir->subtree;
        watches++;
    }

    if (!subtree && !inode->parent)
    {
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        LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &inode->children,
                                  struct inode, ch_entry )
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        {
            assert( tmp != inode );
            assert( tmp->parent == inode );
            free_inode( tmp );
        }
    }

    if (watches)
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        return;

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    if (inode->parent)
        list_remove( &inode->ch_entry );

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    /* 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;
    }

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    if (inode->wd != -1)
    {
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        inotify_rm_watch( get_unix_fd( inotify_fd ), inode->wd );
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        list_remove( &inode->wd_entry );
    }
    list_remove( &inode->ino_entry );
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    free( inode->name );
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    free( inode );
}

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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;
}

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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 =
{
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    inotify_get_poll_events,     /* get_poll_events */
    inotify_poll_event,          /* poll_event */
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    NULL,                        /* flush */
    NULL,                        /* get_fd_type */
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    NULL,                        /* ioctl */
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    NULL,                        /* queue_async */
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    NULL                         /* reselect_async */
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};

static int inotify_get_poll_events( struct fd *fd )
{
    return POLLIN;
}

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static void inotify_do_change_notify( struct dir *dir, unsigned int action,
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                                      unsigned int cookie, const char *relpath )
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{
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    struct change_record *record;

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    assert( dir->obj.ops == &dir_ops );

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    if (dir->want_data)
    {
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        size_t len = strlen(relpath);
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        record = malloc( offsetof(struct change_record, event.name[len]) );
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        if (!record)
            return;

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        record->cookie = cookie;
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        record->event.action = action;
        memcpy( record->event.name, relpath, len );
        record->event.len = len;
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        list_add_tail( &dir->change_records, &record->entry );
    }
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    fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
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}

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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)
699
        filter |= FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_LAST_ACCESS;
700 701 702 703 704
    if (ie->mask & IN_ATTRIB)
        filter |= FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SECURITY;
    if (ie->mask & IN_CREATE)
        filter |= FILE_NOTIFY_CHANGE_CREATION;

705 706 707 708 709
    if (ie->mask & IN_ISDIR)
        filter &= ~FILE_NOTIFY_CHANGE_FILE_NAME;
    else
        filter &= ~FILE_NOTIFY_CHANGE_DIR_NAME;

710 711 712
    return filter;
}

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
/* 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 )
733 734
{
    struct list *head;
735 736 737 738 739
    char *path;
    int len;

    if (!inode)
        return NULL;
740 741

    head = list_head( &inode->dirs );
742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
    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;
}

765
static void inode_check_dir( struct inode *parent, const char *name )
766 767 768 769 770
{
    char *path;
    unsigned int filter;
    struct inode *inode;
    struct stat st;
771
    int wd = -1;
772

773
    path = inode_get_path( parent, strlen(name) );
774
    if (!path)
775
        return;
776 777

    strcat( path, name );
778

779
    if (stat( path, &st ) < 0)
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
        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:
797
    free( path );
798
}
799

800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
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;
825 826
}

827 828
static void inotify_notify_all( struct inotify_event *ie )
{
829
    unsigned int filter, action;
830 831
    struct inode *inode, *i;
    char *path = NULL;
832 833 834 835 836 837 838 839 840 841
    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 );
842 843 844
    
    if (ie->mask & IN_CREATE)
    {
845 846 847
        if (ie->mask & IN_ISDIR)
            inode_check_dir( inode, ie->name );

848 849 850 851
        action = FILE_ACTION_ADDED;
    }
    else if (ie->mask & IN_DELETE)
        action = FILE_ACTION_REMOVED;
852 853 854 855
    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;
856 857
    else
        action = FILE_ACTION_MODIFIED;
858

859
    /*
860
     * Work our way up the inode hierarchy
861
     *  extending the relative path as we go
862
     *  and notifying all recursive watches.
863 864 865 866 867 868 869 870
     */
    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))
871
                inotify_do_change_notify( dir, action, ie->cookie, path );
872 873 874 875 876 877 878 879 880 881 882 883 884

        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 );
    }
885 886
}

887 888 889 890 891 892 893 894 895 896 897 898 899 900
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;
    }

901
    for( ofs = 0; ofs < r - offsetof(struct inotify_event, name); )
902 903
    {
        ie = (struct inotify_event*) &buffer[ofs];
904 905
        ofs += offsetof( struct inotify_event, name[ie->len] );
        if (ofs > r) break;
906
        if (ie->len) inotify_notify_all( ie );
907 908 909
    }
}

910
static inline struct fd *create_inotify_fd( void )
911 912 913 914 915 916
{
    int unix_fd;

    unix_fd = inotify_init();
    if (unix_fd<0)
        return NULL;
917
    return create_anonymous_fd( &inotify_fd_ops, unix_fd, NULL, 0 );
918 919
}

920
static int map_flags( unsigned int filter )
921
{
922 923 924 925
    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);
926

927 928 929 930 931 932 933
    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)
934
        mask |= IN_MODIFY;
935 936 937
    if (filter & FILE_NOTIFY_CHANGE_SECURITY)
        mask |= IN_ATTRIB;

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
    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;
    }

999
    filter = filter_from_inode( inode, 0 );
1000 1001 1002 1003 1004 1005 1006

    sprintf( path, "/proc/self/fd/%u", unix_fd );
    wd = inotify_add_dir( path, filter );
    if (wd == -1) return 0;

    inode_set_wd( inode, wd );

1007
    return 1;
1008 1009
}

1010 1011 1012 1013 1014 1015 1016 1017
static char *get_basename( const char *link )
{
    char *buffer, *name = NULL;
    int r, n = 0x100;

    while (1)
    {
        buffer = malloc( n );
1018
        if (!buffer) return NULL;
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108

        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;
}

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
#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 );
}

1126 1127 1128 1129 1130
static int dir_add_to_existing_notify( struct dir *dir )
{
    return 0;
}

1131
#endif  /* HAVE_SYS_INOTIFY_H */
1132

1133
struct object *create_dir_obj( struct fd *fd, unsigned int access, mode_t mode )
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
{
    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;
1148 1149
    dir->mode = mode;
    dir->uid  = ~(uid_t)0;
1150
    dir->client_process = NULL;
1151 1152
    set_fd_user( fd, &dir_fd_ops, &dir->obj );

1153 1154
    dir_add_to_existing_notify( dir );

1155 1156 1157
    return &dir->obj;
}

1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
/* retrieve (or allocate) the client-side directory cache entry */
DECL_HANDLER(get_directory_cache_entry)
{
    struct dir *dir;
    int *free_entries;
    data_size_t free_size;

    if (!(dir = get_dir_obj( current->process, req->handle, 0 ))) return;

    if (!dir->client_process)
    {
        if ((dir->client_entry = alloc_dir_cache_entry( dir, current->process )) == -1) goto done;
        dir->client_process = (struct process *)grab_object( current->process );
    }

    if (dir->client_process == current->process) reply->entry = dir->client_entry;
    else set_error( STATUS_SHARING_VIOLATION );

done:  /* allow freeing entries even on failure */
    free_size = get_reply_max_size();
    free_entries = get_free_dir_cache_entries( current->process, &free_size );
    if (free_entries) set_reply_data_ptr( free_entries, free_size );

    release_object( dir );
}

1184 1185 1186 1187
/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
    struct dir *dir;
1188
    struct async *async;
1189 1190 1191 1192 1193 1194 1195

    if (!req->filter)
    {
        set_error(STATUS_INVALID_PARAMETER);
        return;
    }

1196
    dir = get_dir_obj( current->process, req->async.handle, 0 );
1197 1198
    if (!dir)
        return;
1199

1200
    /* requests don't timeout */
1201
    if (!(async = create_async( dir->fd, current, &req->async, NULL ))) goto end;
1202
    fd_queue_async( dir->fd, async, ASYNC_TYPE_WAIT );
1203

1204 1205 1206
    /* assign it once */
    if (!dir->filter)
    {
1207
        init_inotify();
1208 1209
        insert_change( dir );
        dir->filter = req->filter;
1210
        dir->subtree = req->subtree;
1211
        dir->want_data = req->want_data;
1212 1213
    }

1214
    /* if there's already a change in the queue, send it */
1215
    if (!list_empty( &dir->change_records ))
1216
        fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
1217

1218
    /* setup the real notification */
1219
    if (!inotify_adjust_changes( dir ))
1220
        dnotify_adjust_changes( dir );
1221 1222 1223

    set_error(STATUS_PENDING);

1224
    release_object( async );
1225 1226
end:
    release_object( dir );
1227
}
1228 1229 1230

DECL_HANDLER(read_change)
{
1231
    struct change_record *record, *next;
1232
    struct dir *dir;
1233 1234 1235
    struct list events;
    char *data, *event;
    int size = 0;
1236 1237 1238 1239 1240

    dir = get_dir_obj( current->process, req->handle, 0 );
    if (!dir)
        return;

1241 1242 1243 1244 1245
    list_init( &events );
    list_move_tail( &events, &dir->change_records );
    release_object( dir );

    if (list_empty( &events ))
1246 1247
    {
        set_error( STATUS_NO_DATA_DETECTED );
1248 1249
        return;
    }
1250

1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
    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] );
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280

            /* 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;

1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
            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 );
    }

    LIST_FOR_EACH_ENTRY_SAFE( record, next, &events, struct change_record, entry )
    {
        list_remove( &record->entry );
        free( record );
    }
1297
}