not compiled yet. This way the modifications become visible later.
ntvfs/common/notify.c -> smbd/notify_internal.c
ntvfs/sysdep/inotify.c -> smbd/notify_inotify.c
Naturally I had to disable notify again :-)
Volker
OPLOCK_OBJ = smbd/oplock.o smbd/oplock_irix.o smbd/oplock_linux.o
NOTIFY_OBJ = smbd/notify.o smbd/notify_hash.o smbd/notify_kernel.o \
- smbd/notify_fam.o smbd/notify_inotify.o
+ smbd/notify_fam.o
VFS_DEFAULT_OBJ = modules/vfs_default.o
VFS_AUDIT_OBJ = modules/vfs_audit.o
{
cnotify = NULL;
-#if HAVE_INOTIFY
- if ((cnotify == NULL) && lp_kernel_change_notify()) {
- cnotify = inotify_notify_init(smbd_event_context());
- }
-#endif
#if HAVE_KERNEL_CHANGE_NOTIFY
if (cnotify == NULL && lp_kernel_change_notify())
cnotify = kernel_notify_init(smbd_event_context());
+/*
+ Unix SMB/CIFS implementation.
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
/*
- * inotify change notify support
- *
- * Copyright (c) Andrew Tridgell 2006
- * Copyright (c) Volker Lendecke 2007
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
+ notify implementation using inotify
+*/
#include "includes.h"
-
-#ifdef HAVE_INOTIFY
+#include "system/filesys.h"
+#include "ntvfs/sysdep/sys_notify.h"
+#include "lib/events/events.h"
+#include "lib/util/dlinklist.h"
+#include "libcli/raw/smb.h"
#include <linux/inotify.h>
#include <asm/unistd.h>
}
#endif
-struct inotify_ctx {
- struct inotify_ctx *prev, *next;
- int wd;
- files_struct *fsp;
-};
-static struct inotify_ctx *inotify_list;
+/* older glibc headers don't have these defines either */
+#ifndef IN_ONLYDIR
+#define IN_ONLYDIR 0x01000000
+#endif
+#ifndef IN_MASK_ADD
+#define IN_MASK_ADD 0x20000000
+#endif
-static int inotify_watch_fd;
+struct inotify_private {
+ struct sys_notify_context *ctx;
+ int fd;
+ struct watch_context *watches;
+};
-/*
- map from a change notify mask to a inotify mask. Remove any bits
- which we can handle
-*/
-static const struct {
- uint32_t notify_mask;
- uint32_t inotify_mask;
-} inotify_mapping[] = {
- {FILE_NOTIFY_CHANGE_FILE_NAME,
- IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
- {FILE_NOTIFY_CHANGE_DIR_NAME,
- IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
- {FILE_NOTIFY_CHANGE_ATTRIBUTES,
- IN_ATTRIB|IN_MOVED_TO|IN_MOVED_FROM|IN_MODIFY},
- {FILE_NOTIFY_CHANGE_LAST_WRITE, IN_ATTRIB},
- {FILE_NOTIFY_CHANGE_LAST_ACCESS, IN_ATTRIB},
- {FILE_NOTIFY_CHANGE_EA, IN_ATTRIB},
- {FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB}
+struct watch_context {
+ struct watch_context *next, *prev;
+ struct inotify_private *in;
+ int wd;
+ sys_notify_callback_t callback;
+ void *private_data;
+ uint32_t mask; /* the inotify mask */
+ uint32_t filter; /* the windows completion filter */
+ const char *path;
};
-static uint32_t inotify_map(uint32 *filter)
-{
- int i;
- uint32_t out=0;
- for (i=0;i<ARRAY_SIZE(inotify_mapping);i++) {
- if (inotify_mapping[i].notify_mask & *filter) {
- out |= inotify_mapping[i].inotify_mask;
- *filter &= ~inotify_mapping[i].notify_mask;
- }
- }
- return out;
-}
-static int inotify_ctx_destructor(struct inotify_ctx *ctx)
+/*
+ destroy the inotify private context
+*/
+static int inotify_destructor(struct inotify_private *in)
{
- if (inotify_rm_watch(inotify_watch_fd, ctx->wd) == -1) {
- DEBUG(0, ("inotify_rm_watch failed: %s\n", strerror(errno)));
- }
- DLIST_REMOVE(inotify_list, ctx);
+ close(in->fd);
return 0;
}
-static void *inotify_add(TALLOC_CTX *mem_ctx,
- struct event_context *event_ctx,
- files_struct *fsp, uint32 *pfilter)
-{
- struct inotify_ctx *ctx;
- uint32_t inotify_mask;
- pstring fullpath;
- uint32 filter;
-
- filter = *pfilter;
- if ((filter & (FILE_NOTIFY_CHANGE_FILE
- |FILE_NOTIFY_CHANGE_DIR_NAME)) == 0) {
- /*
- * This first implementation only looks at create/delete
- */
- return NULL;
- }
- inotify_mask = inotify_map(&filter);
-
- if (inotify_mask == 0) {
- DEBUG(10, ("inotify_mask == 0, nothing to do\n"));
- return NULL;
+/*
+ see if a particular event from inotify really does match a requested
+ notify event in SMB
+*/
+static BOOL filter_match(struct watch_context *w, struct inotify_event *e)
+{
+ if ((e->mask & w->mask) == 0) {
+ /* this happens because inotify_add_watch() coalesces watches on the same
+ path, oring their masks together */
+ return False;
}
- pstrcpy(fullpath, fsp->fsp_name);
- if (!canonicalize_path(fsp->conn, fullpath)) {
- DEBUG(0, ("failed to canonicalize path '%s'\n", fullpath));
- return NULL;
+ /* SMB separates the filters for files and directories */
+ if (e->mask & IN_ISDIR) {
+ if ((w->filter & FILE_NOTIFY_CHANGE_DIR_NAME) == 0) {
+ return False;
+ }
+ } else {
+ if ((e->mask & IN_ATTRIB) &&
+ (w->filter & (FILE_NOTIFY_CHANGE_ATTRIBUTES|
+ FILE_NOTIFY_CHANGE_LAST_WRITE|
+ FILE_NOTIFY_CHANGE_LAST_ACCESS|
+ FILE_NOTIFY_CHANGE_EA|
+ FILE_NOTIFY_CHANGE_SECURITY))) {
+ return True;
+ }
+ if ((e->mask & IN_MODIFY) &&
+ (w->filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)) {
+ return True;
+ }
+ if ((w->filter & FILE_NOTIFY_CHANGE_FILE_NAME) == 0) {
+ return False;
+ }
}
- if (*fullpath != '/') {
- DEBUG(0, ("canonicalized path '%s' into `%s`\n", fsp->fsp_name,
- fullpath));
- DEBUGADD(0, ("but expected an absolute path\n"));
- return NULL;
- }
+ return True;
+}
- if (!(ctx = TALLOC_P(mem_ctx, struct inotify_ctx))) {
- DEBUG(0, ("talloc failed\n"));
- return NULL;
- }
-
- ctx->fsp = fsp;
- ctx->wd = inotify_add_watch(inotify_watch_fd, fullpath, inotify_mask);
- if (ctx->wd == -1) {
- DEBUG(5, ("inotify_add_watch failed: %s\n", strerror(errno)));
- TALLOC_FREE(ctx);
- return NULL;
- }
-
- DLIST_ADD(inotify_list, ctx);
- talloc_set_destructor(ctx, inotify_ctx_destructor);
- *pfilter = filter;
- return ctx;
-}
-
-static void inotify_dispatch(struct inotify_event *e)
+/*
+ dispatch one inotify event
+
+ the cookies are used to correctly handle renames
+*/
+static void inotify_dispatch(struct inotify_private *in,
+ struct inotify_event *e,
+ uint32_t prev_cookie,
+ struct inotify_event *e2)
{
- struct inotify_ctx *ctx;
+ struct watch_context *w, *next;
+ struct notify_event ne;
+
+ /* ignore extraneous events, such as unmount and IN_IGNORED events */
+ if ((e->mask & (IN_ATTRIB|IN_MODIFY|IN_CREATE|IN_DELETE|
+ IN_MOVED_FROM|IN_MOVED_TO)) == 0) {
+ return;
+ }
- for (ctx = inotify_list; ctx; ctx = ctx->next) {
- if (ctx->wd == e->wd) {
- break;
+ /* map the inotify mask to a action. This gets complicated for
+ renames */
+ if (e->mask & IN_CREATE) {
+ ne.action = NOTIFY_ACTION_ADDED;
+ } else if (e->mask & IN_DELETE) {
+ ne.action = NOTIFY_ACTION_REMOVED;
+ } else if (e->mask & IN_MOVED_FROM) {
+ if (e2 != NULL && e2->cookie == e->cookie) {
+ ne.action = NOTIFY_ACTION_OLD_NAME;
+ } else {
+ ne.action = NOTIFY_ACTION_REMOVED;
+ }
+ } else if (e->mask & IN_MOVED_TO) {
+ if (e->cookie == prev_cookie) {
+ ne.action = NOTIFY_ACTION_NEW_NAME;
+ } else {
+ ne.action = NOTIFY_ACTION_ADDED;
}
+ } else {
+ ne.action = NOTIFY_ACTION_MODIFIED;
}
+ ne.path = e->name;
- if (ctx == NULL) {
- /* not found */
- return;
+ /* find any watches that have this watch descriptor */
+ for (w=in->watches;w;w=next) {
+ next = w->next;
+ if (w->wd == e->wd && filter_match(w, e)) {
+ w->callback(in->ctx, w->private_data, &ne);
+ }
}
- if (e->mask & IN_CREATE) {
- notify_fsp(ctx->fsp, NOTIFY_ACTION_ADDED, e->name);
+ /* SMB expects a file rename to generate three events, two for
+ the rename and the other for a modify of the
+ destination. Strange! */
+ if (ne.action != NOTIFY_ACTION_NEW_NAME ||
+ (e->mask & IN_ISDIR) != 0) {
+ return;
}
- if (e->mask & IN_DELETE) {
- notify_fsp(ctx->fsp, NOTIFY_ACTION_REMOVED, e->name);
+ ne.action = NOTIFY_ACTION_MODIFIED;
+ e->mask = IN_ATTRIB;
+
+ for (w=in->watches;w;w=next) {
+ next = w->next;
+ if (w->wd == e->wd && filter_match(w, e) &&
+ !(w->filter & FILE_NOTIFY_CHANGE_CREATION)) {
+ w->callback(in->ctx, w->private_data, &ne);
+ }
}
}
-static void inotify_callback(struct event_context *event_ctx,
- struct fd_event *event,
- uint16 flags,
- void *private_data)
+/*
+ called when the kernel has some events for us
+*/
+static void inotify_handler(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private_data)
{
- char *buf, *p;
- int bufsize;
+ struct inotify_private *in = talloc_get_type(private_data,
+ struct inotify_private);
+ int bufsize = 0;
+ struct inotify_event *e0, *e;
+ uint32_t prev_cookie=0;
/*
we must use FIONREAD as we cannot predict the length of the
filenames, and thus can't know how much to allocate
otherwise
*/
- if ((ioctl(inotify_watch_fd, FIONREAD, &bufsize) != 0)
- || (bufsize == 0)) {
+ if (ioctl(in->fd, FIONREAD, &bufsize) != 0 ||
+ bufsize == 0) {
DEBUG(0,("No data on inotify fd?!\n"));
return;
}
- if (!(buf = SMB_MALLOC_ARRAY(char, bufsize))) {
- DEBUG(0, ("malloc failed\n"));
- return;
- }
+ e0 = e = talloc_size(in, bufsize);
+ if (e == NULL) return;
- if (read(inotify_watch_fd, buf, bufsize) != bufsize) {
+ if (read(in->fd, e0, bufsize) != bufsize) {
DEBUG(0,("Failed to read all inotify data\n"));
- SAFE_FREE(buf);
+ talloc_free(e0);
return;
}
- p = buf;
+ /* we can get more than one event in the buffer */
+ while (bufsize >= sizeof(*e)) {
+ struct inotify_event *e2 = NULL;
+ bufsize -= e->len + sizeof(*e);
+ if (bufsize >= sizeof(*e)) {
+ e2 = (struct inotify_event *)(e->len + sizeof(*e) + (char *)e);
+ }
+ inotify_dispatch(in, e, prev_cookie, e2);
+ prev_cookie = e->cookie;
+ e = e2;
+ }
- while (bufsize > sizeof(struct inotify_event)) {
- struct inotify_event *iev = (struct inotify_event *)p;
- size_t len = sizeof(struct inotify_event) + iev->len;
+ talloc_free(e0);
+}
- if ((len > bufsize)
- || ((iev->len != 0) && (iev->name[iev->len-1] != '\0'))) {
- smb_panic("invalid inotify reply\n");
- }
+/*
+ setup the inotify handle - called the first time a watch is added on
+ this context
+*/
+static NTSTATUS inotify_setup(struct sys_notify_context *ctx)
+{
+ struct inotify_private *in;
- inotify_dispatch(iev);
+ if (!lp_parm_bool(-1, "notify", "inotify", True)) {
+ return NT_STATUS_INVALID_SYSTEM_SERVICE;
+ }
- p += len;
- bufsize -= len;
+ in = talloc(ctx, struct inotify_private);
+ NT_STATUS_HAVE_NO_MEMORY(in);
+ in->fd = inotify_init();
+ if (in->fd == -1) {
+ DEBUG(0,("Failed to init inotify - %s\n", strerror(errno)));
+ talloc_free(in);
+ return map_nt_error_from_unix(errno);
}
+ in->ctx = ctx;
+ in->watches = NULL;
+
+ ctx->private_data = in;
+ talloc_set_destructor(in, inotify_destructor);
- SAFE_FREE(buf);
- return;
+ /* add a event waiting for the inotify fd to be readable */
+ event_add_fd(ctx->ev, in, in->fd, EVENT_FD_READ, inotify_handler, in);
+
+ return NT_STATUS_OK;
}
-static struct cnotify_fns inotify_fns =
-{
- inotify_add,
+
+/*
+ map from a change notify mask to a inotify mask. Remove any bits
+ which we can handle
+*/
+static const struct {
+ uint32_t notify_mask;
+ uint32_t inotify_mask;
+} inotify_mapping[] = {
+ {FILE_NOTIFY_CHANGE_FILE_NAME, IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
+ {FILE_NOTIFY_CHANGE_DIR_NAME, IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO},
+ {FILE_NOTIFY_CHANGE_ATTRIBUTES, IN_ATTRIB|IN_MOVED_TO|IN_MOVED_FROM|IN_MODIFY},
+ {FILE_NOTIFY_CHANGE_LAST_WRITE, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_LAST_ACCESS, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_EA, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB}
};
-struct cnotify_fns *inotify_notify_init(struct event_context *event_ctx)
+static uint32_t inotify_map(struct notify_entry *e)
+{
+ int i;
+ uint32_t out=0;
+ for (i=0;i<ARRAY_SIZE(inotify_mapping);i++) {
+ if (inotify_mapping[i].notify_mask & e->filter) {
+ out |= inotify_mapping[i].inotify_mask;
+ e->filter &= ~inotify_mapping[i].notify_mask;
+ }
+ }
+ return out;
+}
+
+/*
+ destroy a watch
+*/
+static int watch_destructor(struct watch_context *w)
{
- inotify_watch_fd = inotify_init();
+ struct inotify_private *in = w->in;
+ int wd = w->wd;
+ DLIST_REMOVE(w->in->watches, w);
+
+ /* only rm the watch if its the last one with this wd */
+ for (w=in->watches;w;w=w->next) {
+ if (w->wd == wd) break;
+ }
+ if (w == NULL) {
+ inotify_rm_watch(in->fd, wd);
+ }
+ return 0;
+}
+
+
+/*
+ add a watch. The watch is removed when the caller calls
+ talloc_free() on *handle
+*/
+static NTSTATUS inotify_watch(struct sys_notify_context *ctx,
+ struct notify_entry *e,
+ sys_notify_callback_t callback,
+ void *private_data,
+ void *handle_p)
+{
+ struct inotify_private *in;
+ int wd;
+ uint32_t mask;
+ struct watch_context *w;
+ uint32_t filter = e->filter;
+ void **handle = (void **)handle_p;
+
+ /* maybe setup the inotify fd */
+ if (ctx->private_data == NULL) {
+ NTSTATUS status;
+ status = inotify_setup(ctx);
+ NT_STATUS_NOT_OK_RETURN(status);
+ }
- DEBUG(10, ("inotify_notify_init called\n"));
+ in = talloc_get_type(ctx->private_data, struct inotify_private);
- if (inotify_watch_fd == -1) {
- DEBUG(0, ("inotify_init failed: %s\n", strerror(errno)));
- return NULL;
+ mask = inotify_map(e);
+ if (mask == 0) {
+ /* this filter can't be handled by inotify */
+ return NT_STATUS_INVALID_PARAMETER;
}
- if (event_add_fd(event_ctx, NULL, inotify_watch_fd,
- EVENT_FD_READ, inotify_callback,
- NULL) == NULL) {
- DEBUG(0, ("event_add_fd failed\n"));
- close(inotify_watch_fd);
- inotify_watch_fd = -1;
- return NULL;
+ /* using IN_MASK_ADD allows us to cope with inotify() returning the same
+ watch descriptor for muliple watches on the same path */
+ mask |= (IN_MASK_ADD | IN_ONLYDIR);
+
+ /* get a new watch descriptor for this path */
+ wd = inotify_add_watch(in->fd, e->path, mask);
+ if (wd == -1) {
+ e->filter = filter;
+ return map_nt_error_from_unix(errno);
}
- return &inotify_fns;
+ w = talloc(in, struct watch_context);
+ if (w == NULL) {
+ inotify_rm_watch(in->fd, wd);
+ e->filter = filter;
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ w->in = in;
+ w->wd = wd;
+ w->callback = callback;
+ w->private_data = private_data;
+ w->mask = mask;
+ w->filter = filter;
+ w->path = talloc_strdup(w, e->path);
+ if (w->path == NULL) {
+ inotify_rm_watch(in->fd, wd);
+ e->filter = filter;
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ (*handle) = w;
+
+ DLIST_ADD(in->watches, w);
+
+ /* the caller frees the handle to stop watching */
+ talloc_set_destructor(w, watch_destructor);
+
+ return NT_STATUS_OK;
}
-#endif
+
+static struct sys_notify_backend inotify = {
+ .name = "inotify",
+ .notify_watch = inotify_watch
+};
+
+/*
+ initialialise the inotify module
+ */
+NTSTATUS sys_notify_inotify_init(void)
+{
+ /* register ourselves as a system inotify module */
+ return sys_notify_register(&inotify);
+}
--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ this is the change notify database. It implements mechanisms for
+ storing current change notify waiters in a tdb, and checking if a
+ given event matches any of the stored notify waiiters.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "lib/tdb/include/tdb.h"
+#include "lib/util/util_tdb.h"
+#include "messaging/messaging.h"
+#include "db_wrap.h"
+#include "lib/messaging/irpc.h"
+#include "librpc/gen_ndr/ndr_notify.h"
+#include "lib/util/dlinklist.h"
+#include "ntvfs/common/ntvfs_common.h"
+#include "ntvfs/sysdep/sys_notify.h"
+#include "cluster/cluster.h"
+
+struct notify_context {
+ struct tdb_wrap *w;
+ struct server_id server;
+ struct messaging_context *messaging_ctx;
+ struct notify_list *list;
+ struct notify_array *array;
+ int seqnum;
+ struct sys_notify_context *sys_notify_ctx;
+};
+
+
+struct notify_list {
+ struct notify_list *next, *prev;
+ void *private_data;
+ void (*callback)(void *, const struct notify_event *);
+ void *sys_notify_handle;
+ int depth;
+};
+
+#define NOTIFY_KEY "notify array"
+
+#define NOTIFY_ENABLE "notify:enable"
+#define NOTIFY_ENABLE_DEFAULT True
+
+static NTSTATUS notify_remove_all(struct notify_context *notify);
+static void notify_handler(struct messaging_context *msg_ctx, void *private_data,
+ uint32_t msg_type, struct server_id server_id, DATA_BLOB *data);
+
+/*
+ destroy the notify context
+*/
+static int notify_destructor(struct notify_context *notify)
+{
+ messaging_deregister(notify->messaging_ctx, MSG_PVFS_NOTIFY, notify);
+ notify_remove_all(notify);
+ return 0;
+}
+
+/*
+ Open up the notify.tdb database. You should close it down using
+ talloc_free(). We need the messaging_ctx to allow for notifications
+ via internal messages
+*/
+struct notify_context *notify_init(TALLOC_CTX *mem_ctx, struct server_id server,
+ struct messaging_context *messaging_ctx,
+ struct event_context *ev,
+ struct share_config *scfg)
+{
+ struct notify_context *notify;
+
+ if (share_bool_option(scfg, NOTIFY_ENABLE, NOTIFY_ENABLE_DEFAULT) != True) {
+ return NULL;
+ }
+
+ notify = talloc(mem_ctx, struct notify_context);
+ if (notify == NULL) {
+ return NULL;
+ }
+
+ notify->w = cluster_tdb_tmp_open(notify, "notify.tdb", TDB_SEQNUM);
+ if (notify->w == NULL) {
+ talloc_free(notify);
+ return NULL;
+ }
+
+ notify->server = server;
+ notify->messaging_ctx = messaging_ctx;
+ notify->list = NULL;
+ notify->array = NULL;
+ notify->seqnum = tdb_get_seqnum(notify->w->tdb);
+
+ talloc_set_destructor(notify, notify_destructor);
+
+ /* register with the messaging subsystem for the notify
+ message type */
+ messaging_register(notify->messaging_ctx, notify,
+ MSG_PVFS_NOTIFY, notify_handler);
+
+ notify->sys_notify_ctx = sys_notify_context_create(scfg, notify, ev);
+
+ return notify;
+}
+
+
+/*
+ lock the notify db
+*/
+static NTSTATUS notify_lock(struct notify_context *notify)
+{
+ if (tdb_lock_bystring(notify->w->tdb, NOTIFY_KEY) != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+ return NT_STATUS_OK;
+}
+
+/*
+ unlock the notify db
+*/
+static void notify_unlock(struct notify_context *notify)
+{
+ tdb_unlock_bystring(notify->w->tdb, NOTIFY_KEY);
+}
+
+/*
+ load the notify array
+*/
+static NTSTATUS notify_load(struct notify_context *notify)
+{
+ TDB_DATA dbuf;
+ DATA_BLOB blob;
+ NTSTATUS status;
+ int seqnum;
+
+ seqnum = tdb_get_seqnum(notify->w->tdb);
+
+ if (seqnum == notify->seqnum && notify->array != NULL) {
+ return NT_STATUS_OK;
+ }
+
+ notify->seqnum = seqnum;
+
+ talloc_free(notify->array);
+ notify->array = talloc_zero(notify, struct notify_array);
+ NT_STATUS_HAVE_NO_MEMORY(notify->array);
+
+ dbuf = tdb_fetch_bystring(notify->w->tdb, NOTIFY_KEY);
+ if (dbuf.dptr == NULL) {
+ return NT_STATUS_OK;
+ }
+
+ blob.data = dbuf.dptr;
+ blob.length = dbuf.dsize;
+
+ status = ndr_pull_struct_blob(&blob, notify->array, notify->array,
+ (ndr_pull_flags_fn_t)ndr_pull_notify_array);
+ free(dbuf.dptr);
+
+ return status;
+}
+
+/*
+ compare notify entries for sorting
+*/
+static int notify_compare(const void *p1, const void *p2)
+{
+ const struct notify_entry *e1 = p1, *e2 = p2;
+ return strcmp(e1->path, e2->path);
+}
+
+/*
+ save the notify array
+*/
+static NTSTATUS notify_save(struct notify_context *notify)
+{
+ TDB_DATA dbuf;
+ DATA_BLOB blob;
+ NTSTATUS status;
+ int ret;
+ TALLOC_CTX *tmp_ctx;
+
+ /* if possible, remove some depth arrays */
+ while (notify->array->num_depths > 0 &&
+ notify->array->depth[notify->array->num_depths-1].num_entries == 0) {
+ notify->array->num_depths--;
+ }
+
+ /* we might just be able to delete the record */
+ if (notify->array->num_depths == 0) {
+ ret = tdb_delete_bystring(notify->w->tdb, NOTIFY_KEY);
+ if (ret != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+ return NT_STATUS_OK;
+ }
+
+ tmp_ctx = talloc_new(notify);
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+ status = ndr_push_struct_blob(&blob, tmp_ctx, notify->array,
+ (ndr_push_flags_fn_t)ndr_push_notify_array);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return status;
+ }
+
+ dbuf.dptr = blob.data;
+ dbuf.dsize = blob.length;
+
+ ret = tdb_store_bystring(notify->w->tdb, NOTIFY_KEY, dbuf, TDB_REPLACE);
+ talloc_free(tmp_ctx);
+ if (ret != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ return NT_STATUS_OK;
+}
+
+
+/*
+ handle incoming notify messages
+*/
+static void notify_handler(struct messaging_context *msg_ctx, void *private_data,
+ uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
+{
+ struct notify_context *notify = talloc_get_type(private_data, struct notify_context);
+ NTSTATUS status;
+ struct notify_event ev;
+ TALLOC_CTX *tmp_ctx = talloc_new(notify);
+ struct notify_list *listel;
+
+ if (tmp_ctx == NULL) {
+ return;
+ }
+
+ status = ndr_pull_struct_blob(data, tmp_ctx, &ev,
+ (ndr_pull_flags_fn_t)ndr_pull_notify_event);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ for (listel=notify->list;listel;listel=listel->next) {
+ if (listel->private_data == ev.private_data) {
+ listel->callback(listel->private_data, &ev);
+ break;
+ }
+ }
+
+ talloc_free(tmp_ctx);
+}
+
+/*
+ callback from sys_notify telling us about changes from the OS
+*/
+static void sys_notify_callback(struct sys_notify_context *ctx,
+ void *ptr, struct notify_event *ev)
+{
+ struct notify_list *listel = talloc_get_type(ptr, struct notify_list);
+ ev->private_data = listel;
+ listel->callback(listel->private_data, ev);
+}
+
+/*
+ add an entry to the notify array
+*/
+static NTSTATUS notify_add_array(struct notify_context *notify, struct notify_entry *e,
+ void *private_data, int depth)
+{
+ int i;
+ struct notify_depth *d;
+ struct notify_entry *ee;
+
+ /* possibly expand the depths array */
+ if (depth >= notify->array->num_depths) {
+ d = talloc_realloc(notify->array, notify->array->depth,
+ struct notify_depth, depth+1);
+ NT_STATUS_HAVE_NO_MEMORY(d);
+ for (i=notify->array->num_depths;i<=depth;i++) {
+ ZERO_STRUCT(d[i]);
+ }
+ notify->array->depth = d;
+ notify->array->num_depths = depth+1;
+ }
+ d = ¬ify->array->depth[depth];
+
+ /* expand the entries array */
+ ee = talloc_realloc(notify->array->depth, d->entries, struct notify_entry,
+ d->num_entries+1);
+ NT_STATUS_HAVE_NO_MEMORY(ee);
+ d->entries = ee;
+
+ d->entries[d->num_entries] = *e;
+ d->entries[d->num_entries].private_data = private_data;
+ d->entries[d->num_entries].server = notify->server;
+ d->entries[d->num_entries].path_len = strlen(e->path);
+ d->num_entries++;
+
+ d->max_mask |= e->filter;
+ d->max_mask_subdir |= e->subdir_filter;
+
+ if (d->num_entries > 1) {
+ qsort(d->entries, d->num_entries, sizeof(d->entries[0]), notify_compare);
+ }
+
+ /* recalculate the maximum masks */
+ d->max_mask = 0;
+ d->max_mask_subdir = 0;
+
+ for (i=0;i<d->num_entries;i++) {
+ d->max_mask |= d->entries[i].filter;
+ d->max_mask_subdir |= d->entries[i].subdir_filter;
+ }
+
+ return notify_save(notify);
+}
+
+/*
+ add a notify watch. This is called when a notify is first setup on a open
+ directory handle.
+*/
+NTSTATUS notify_add(struct notify_context *notify, struct notify_entry *e0,
+ void (*callback)(void *, const struct notify_event *),
+ void *private_data)
+{
+ struct notify_entry e = *e0;
+ NTSTATUS status;
+ char *tmp_path = NULL;
+ struct notify_list *listel;
+ size_t len;
+ int depth;
+
+ /* see if change notify is enabled at all */
+ if (notify == NULL) {
+ return NT_STATUS_NOT_IMPLEMENTED;
+ }
+
+ status = notify_lock(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ status = notify_load(notify);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
+ }
+
+ /* cope with /. on the end of the path */
+ len = strlen(e.path);
+ if (len > 1 && e.path[len-1] == '.' && e.path[len-2] == '/') {
+ tmp_path = talloc_strndup(notify, e.path, len-2);
+ if (tmp_path == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+ e.path = tmp_path;
+ }
+
+ depth = count_chars(e.path, '/');
+
+ listel = talloc_zero(notify, struct notify_list);
+ if (listel == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
+ listel->private_data = private_data;
+ listel->callback = callback;
+ listel->depth = depth;
+ DLIST_ADD(notify->list, listel);
+
+ /* ignore failures from sys_notify */
+ if (notify->sys_notify_ctx != NULL) {
+ /*
+ this call will modify e.filter and e.subdir_filter
+ to remove bits handled by the backend
+ */
+ status = sys_notify_watch(notify->sys_notify_ctx, &e,
+ sys_notify_callback, listel,
+ &listel->sys_notify_handle);
+ if (NT_STATUS_IS_OK(status)) {
+ talloc_steal(listel, listel->sys_notify_handle);
+ }
+ }
+
+ /* if the system notify handler couldn't handle some of the
+ filter bits, or couldn't handle a request for recursion
+ then we need to install it in the array used for the
+ intra-samba notify handling */
+ if (e.filter != 0 || e.subdir_filter != 0) {
+ status = notify_add_array(notify, &e, private_data, depth);
+ }
+
+done:
+ notify_unlock(notify);
+ talloc_free(tmp_path);
+
+ return status;
+}
+
+/*
+ remove a notify watch. Called when the directory handle is closed
+*/
+NTSTATUS notify_remove(struct notify_context *notify, void *private_data)
+{
+ NTSTATUS status;
+ struct notify_list *listel;
+ int i, depth;
+ struct notify_depth *d;
+
+ /* see if change notify is enabled at all */
+ if (notify == NULL) {
+ return NT_STATUS_NOT_IMPLEMENTED;
+ }
+
+ for (listel=notify->list;listel;listel=listel->next) {
+ if (listel->private_data == private_data) {
+ DLIST_REMOVE(notify->list, listel);
+ break;
+ }
+ }
+ if (listel == NULL) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ depth = listel->depth;
+
+ talloc_free(listel);
+
+ status = notify_lock(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ status = notify_load(notify);
+ if (!NT_STATUS_IS_OK(status)) {
+ notify_unlock(notify);
+ return status;
+ }
+
+ if (depth >= notify->array->num_depths) {
+ notify_unlock(notify);
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ /* we only have to search at the depth of this element */
+ d = ¬ify->array->depth[depth];
+
+ for (i=0;i<d->num_entries;i++) {
+ if (private_data == d->entries[i].private_data &&
+ cluster_id_equal(¬ify->server, &d->entries[i].server)) {
+ break;
+ }
+ }
+ if (i == d->num_entries) {
+ notify_unlock(notify);
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ if (i < d->num_entries-1) {
+ memmove(&d->entries[i], &d->entries[i+1],
+ sizeof(d->entries[i])*(d->num_entries-(i+1)));
+ }
+ d->num_entries--;
+
+ status = notify_save(notify);
+
+ notify_unlock(notify);
+
+ return status;
+}
+
+/*
+ remove all notify watches for this messaging server
+*/
+static NTSTATUS notify_remove_all(struct notify_context *notify)
+{
+ NTSTATUS status;
+ int i, depth, del_count=0;
+
+ if (notify->list == NULL) {
+ return NT_STATUS_OK;
+ }
+
+ status = notify_lock(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ status = notify_load(notify);
+ if (!NT_STATUS_IS_OK(status)) {
+ notify_unlock(notify);
+ return status;
+ }
+
+ /* we have to search for all entries across all depths, looking for matches
+ for our server id */
+ for (depth=0;depth<notify->array->num_depths;depth++) {
+ struct notify_depth *d = ¬ify->array->depth[depth];
+ for (i=0;i<d->num_entries;i++) {
+ if (cluster_id_equal(¬ify->server, &d->entries[i].server)) {
+ if (i < d->num_entries-1) {
+ memmove(&d->entries[i], &d->entries[i+1],
+ sizeof(d->entries[i])*(d->num_entries-(i+1)));
+ }
+ i--;
+ d->num_entries--;
+ del_count++;
+ }
+ }
+ }
+
+ if (del_count > 0) {
+ status = notify_save(notify);
+ }
+
+ notify_unlock(notify);
+
+ return status;
+}
+
+
+/*
+ send a notify message to another messaging server
+*/
+static void notify_send(struct notify_context *notify, struct notify_entry *e,
+ const char *path, uint32_t action)
+{
+ struct notify_event ev;
+ DATA_BLOB data;
+ NTSTATUS status;
+ TALLOC_CTX *tmp_ctx;
+
+ ev.action = action;
+ ev.path = path;
+ ev.private_data = e->private_data;
+
+ tmp_ctx = talloc_new(notify);
+
+ status = ndr_push_struct_blob(&data, tmp_ctx, &ev,
+ (ndr_push_flags_fn_t)ndr_push_notify_event);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ status = messaging_send(notify->messaging_ctx, e->server,
+ MSG_PVFS_NOTIFY, &data);
+ talloc_free(tmp_ctx);
+}
+
+
+/*
+ trigger a notify message for anyone waiting on a matching event
+
+ This function is called a lot, and needs to be very fast. The unusual data structure
+ and traversal is designed to be fast in the average case, even for large numbers of
+ notifies
+*/
+void notify_trigger(struct notify_context *notify,
+ uint32_t action, uint32_t filter, const char *path)
+{
+ NTSTATUS status;
+ int depth;
+ const char *p, *next_p;
+
+ /* see if change notify is enabled at all */
+ if (notify == NULL) {
+ return;
+ }
+
+ status = notify_load(notify);
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ /* loop along the given path, working with each directory depth separately */
+ for (depth=0,p=path;
+ p && depth < notify->array->num_depths;
+ p=next_p,depth++) {
+ int p_len = p - path;
+ int min_i, max_i, i;
+ struct notify_depth *d = ¬ify->array->depth[depth];
+ next_p = strchr(p+1, '/');
+
+ /* see if there are any entries at this depth */
+ if (d->num_entries == 0) continue;
+
+ /* try to skip based on the maximum mask. If next_p is
+ NULL then we know it will be a 'this directory'
+ match, otherwise it must be a subdir match */
+ if (next_p != NULL) {
+ if (0 == (filter & d->max_mask_subdir)) {
+ continue;
+ }
+ } else {
+ if (0 == (filter & d->max_mask)) {
+ continue;
+ }
+ }
+
+ /* we know there is an entry here worth looking
+ for. Use a bisection search to find the first entry
+ with a matching path */
+ min_i = 0;
+ max_i = d->num_entries-1;
+
+ while (min_i < max_i) {
+ struct notify_entry *e;
+ int cmp;
+ i = (min_i+max_i)/2;
+ e = &d->entries[i];
+ cmp = strncmp(path, e->path, p_len);
+ if (cmp == 0) {
+ if (p_len == e->path_len) {
+ max_i = i;
+ } else {
+ max_i = i-1;
+ }
+ } else if (cmp < 0) {
+ max_i = i-1;
+ } else {
+ min_i = i+1;
+ }
+ }
+
+ if (min_i != max_i) {
+ /* none match */
+ continue;
+ }
+
+ /* we now know that the entries start at min_i */
+ for (i=min_i;i<d->num_entries;i++) {
+ struct notify_entry *e = &d->entries[i];
+ if (p_len != e->path_len ||
+ strncmp(path, e->path, p_len) != 0) break;
+ if (next_p != NULL) {
+ if (0 == (filter & e->subdir_filter)) {
+ continue;
+ }
+ } else {
+ if (0 == (filter & e->filter)) {
+ continue;
+ }
+ }
+ notify_send(notify, e, path + e->path_len + 1, action);
+ }
+ }
+}
git.samba.org / samba.git / commitdiff