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-rw-r--r--source4/ntvfs/sysdep/README5
-rw-r--r--source4/ntvfs/sysdep/config.m47
-rw-r--r--source4/ntvfs/sysdep/config.mk20
-rw-r--r--source4/ntvfs/sysdep/inotify.c313
-rw-r--r--source4/ntvfs/sysdep/sys_notify.c96
-rw-r--r--source4/ntvfs/sysdep/sys_notify.h52
6 files changed, 493 insertions, 0 deletions
diff --git a/source4/ntvfs/sysdep/README b/source4/ntvfs/sysdep/README
new file mode 100644
index 0000000000..a2a8f57c28
--- /dev/null
+++ b/source4/ntvfs/sysdep/README
@@ -0,0 +1,5 @@
+This directory contains OS depdendent interfaces to facilities that
+are only available on a few of our target systems, and require
+substantial code to abstract.
+
+
diff --git a/source4/ntvfs/sysdep/config.m4 b/source4/ntvfs/sysdep/config.m4
new file mode 100644
index 0000000000..f67a3bdace
--- /dev/null
+++ b/source4/ntvfs/sysdep/config.m4
@@ -0,0 +1,7 @@
+AC_CHECK_HEADERS(linux/inotify.h asm/unistd.h)
+AC_CHECK_FUNC(inotify_init)
+
+SMB_ENABLE(ntvfs_inotify, NO)
+if test x"$ac_cv_header_linux_inotify_h" = x"yes"; then
+ SMB_ENABLE(ntvfs_inotify, YES)
+fi
diff --git a/source4/ntvfs/sysdep/config.mk b/source4/ntvfs/sysdep/config.mk
new file mode 100644
index 0000000000..3bcebb5c0e
--- /dev/null
+++ b/source4/ntvfs/sysdep/config.mk
@@ -0,0 +1,20 @@
+################################################
+# Start MODULE ntvfs_sys_notify
+[MODULE::ntvfs_sys_notify]
+SUBSYSTEM = ntvfs
+OBJ_FILES = \
+ sys_notify.o
+# End MODULE ntvfs_sys_notify
+################################################
+
+
+################################################
+# Start MODULE ntvfs_inotify
+[MODULE::ntvfs_inotify]
+SUBSYSTEM = ntvfs
+INIT_FUNCTION = ntvfs_inotify_init
+OBJ_FILES = \
+ inotify.o
+# End MODULE ntvfs_inotify
+################################################
+
diff --git a/source4/ntvfs/sysdep/inotify.c b/source4/ntvfs/sysdep/inotify.c
new file mode 100644
index 0000000000..31c408d112
--- /dev/null
+++ b/source4/ntvfs/sysdep/inotify.c
@@ -0,0 +1,313 @@
+/*
+ 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.
+*/
+
+/*
+ notify implementation using inotify
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "ntvfs/sysdep/sys_notify.h"
+#include "lib/events/events.h"
+#include "smb.h"
+#include "dlinklist.h"
+
+#include <linux/inotify.h>
+#include <asm/unistd.h>
+
+#ifndef HAVE_INOTIFY_INIT
+/*
+ glibc doesn't define these functions yet (as of March 2006)
+*/
+static int inotify_init(void)
+{
+ return syscall(__NR_inotify_init);
+}
+
+static int inotify_add_watch(int fd, const char *path, __u32 mask)
+{
+ return syscall(__NR_inotify_add_watch, fd, path, mask);
+}
+
+static int inotify_rm_watch(int fd, int wd)
+{
+ return syscall(__NR_inotify_rm_watch, fd, wd);
+}
+#endif
+
+
+/* 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
+
+struct inotify_private {
+ struct sys_notify_context *ctx;
+ int fd;
+ struct watch_context *watches;
+};
+
+struct watch_context {
+ struct watch_context *next, *prev;
+ struct inotify_private *in;
+ int wd;
+ sys_notify_callback_t callback;
+ void *private;
+ uint32_t mask;
+};
+
+
+/*
+ destroy the inotify private context
+*/
+static int inotify_destructor(void *ptr)
+{
+ struct inotify_private *in = talloc_get_type(ptr, struct inotify_private);
+ close(in->fd);
+ return 0;
+}
+
+
+/*
+ dispatch one inotify event
+*/
+static void inotify_dispatch(struct inotify_private *in, struct inotify_event *e)
+{
+ struct watch_context *w;
+ struct notify_event ne;
+
+ /* ignore extraneous events, such as unmount and IN_IGNORED events */
+ if ((e->mask & (IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO)) == 0) {
+ return;
+ }
+
+ /* map the inotify mask to a action */
+ if (e->mask & IN_CREATE) {
+ ne.action = NOTIFY_ACTION_ADDED;
+ } else if (e->mask & IN_DELETE) {
+ ne.action = NOTIFY_ACTION_REMOVED;
+ } else {
+ ne.action = NOTIFY_ACTION_MODIFIED;
+ }
+ ne.path = e->name;
+
+ /* find any watches that have this watch descriptor */
+ for (w=in->watches;w;w=w->next) {
+ /* checking the mask copes with multiple watches */
+ if (w->wd == e->wd && (e->mask & w->mask) != 0) {
+ w->callback(in->ctx, w->private, &ne);
+ }
+ }
+}
+
+/*
+ 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)
+{
+ struct inotify_private *in = talloc_get_type(private, struct inotify_private);
+ int bufsize = 0;
+ struct inotify_event *e0, *e;
+
+ /*
+ 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(in->fd, FIONREAD, &bufsize) != 0 ||
+ bufsize == 0) {
+ DEBUG(0,("No data on inotify fd?!\n"));
+ return;
+ }
+
+ e0 = e = talloc_size(in, bufsize);
+ if (e == NULL) return;
+
+ if (read(in->fd, e0, bufsize) != bufsize) {
+ DEBUG(0,("Failed to read all inotify data\n"));
+ talloc_free(e0);
+ return;
+ }
+
+ /* we can get more than one event in the buffer */
+ while (bufsize >= sizeof(*e)) {
+ inotify_dispatch(in, e);
+ bufsize -= e->len + sizeof(*e);
+ e = (struct inotify_event *)(e->len + sizeof(*e) + (char *)e);
+ }
+
+ talloc_free(e0);
+}
+
+/*
+ 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;
+
+ 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 = in;
+ talloc_set_destructor(in, inotify_destructor);
+
+ /* 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;
+}
+
+
+/*
+ map from a change notify mask to a inotify mask. Approximate only :(
+*/
+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_ATTRIBUTES, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_SIZE, IN_MODIFY},
+ {FILE_NOTIFY_CHANGE_LAST_WRITE, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_EA, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB}
+};
+
+static uint32_t inotify_map(uint32_t mask)
+{
+ int i;
+ uint32_t out=0;
+ for (i=0;i<ARRAY_SIZE(inotify_mapping);i++) {
+ if (inotify_mapping[i].notify_mask & mask) {
+ out |= inotify_mapping[i].inotify_mask;
+ }
+ }
+ return out;
+}
+
+/*
+ destroy a watch
+*/
+static int watch_destructor(void *ptr)
+{
+ struct watch_context *w = talloc_get_type(ptr, struct watch_context);
+ 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, const char *dirpath,
+ uint32_t filter, sys_notify_callback_t callback,
+ void *private, void **handle)
+{
+ struct inotify_private *in;
+ int wd;
+ uint32_t mask;
+ struct watch_context *w;
+
+ /* maybe setup the inotify fd */
+ if (ctx->private == NULL) {
+ NTSTATUS status;
+ status = inotify_setup(ctx);
+ NT_STATUS_NOT_OK_RETURN(status);
+ }
+
+ in = talloc_get_type(ctx->private, struct inotify_private);
+
+ mask = inotify_map(filter);
+ if (mask == 0) {
+ /* this filter can't be handled by inotify */
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* 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, dirpath, mask);
+ if (wd == -1) {
+ return map_nt_error_from_unix(errno);
+ }
+
+ w = talloc(in, struct watch_context);
+ if (w == NULL) {
+ inotify_rm_watch(in->fd, wd);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ w->in = in;
+ w->wd = wd;
+ w->callback = callback;
+ w->private = private;
+ w->mask = mask;
+
+ (*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;
+}
+
+
+static struct sys_notify_backend inotify = {
+ .name = "inotify",
+ .notify_watch = inotify_watch
+};
+
+/*
+ initialialise the inotify module
+ */
+NTSTATUS ntvfs_inotify_init(void)
+{
+ /* register ourselves as a system inotify module */
+ return sys_notify_register(&inotify);
+}
diff --git a/source4/ntvfs/sysdep/sys_notify.c b/source4/ntvfs/sysdep/sys_notify.c
new file mode 100644
index 0000000000..aedfd2a7de
--- /dev/null
+++ b/source4/ntvfs/sysdep/sys_notify.c
@@ -0,0 +1,96 @@
+/*
+ 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.
+*/
+
+/*
+ abstract the various kernel interfaces to change notify into a
+ single Samba friendly interface
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "ntvfs/sysdep/sys_notify.h"
+#include "lib/events/events.h"
+#include "dlinklist.h"
+
+/* list of registered backends */
+static struct sys_notify_backend *backends;
+
+
+/*
+ initialise a system change notify backend
+*/
+struct sys_notify_context *sys_notify_init(int snum,
+ TALLOC_CTX *mem_ctx,
+ struct event_context *ev)
+{
+ struct sys_notify_context *ctx;
+ const char *bname;
+ struct sys_notify_backend *b;
+
+ if (backends == NULL) {
+ return NULL;
+ }
+
+ if (ev == NULL) {
+ ev = event_context_find(mem_ctx);
+ }
+
+ ctx = talloc_zero(mem_ctx, struct sys_notify_context);
+ if (ctx == NULL) {
+ return NULL;
+ }
+
+ ctx->ev = ev;
+
+ bname = lp_parm_string(snum, "notify", "backend");
+ if (bname == NULL) {
+ bname = backends->name;
+ }
+
+ for (b=backends;b;b=b->next) {
+ if (strcasecmp(b->name, bname) == 0) break;
+ }
+
+ if (b != NULL) {
+ ctx->name = b->name;
+ ctx->notify_watch = b->notify_watch;
+ }
+
+ return ctx;
+}
+
+/*
+ add a watch
+*/
+NTSTATUS sys_notify_watch(struct sys_notify_context *ctx, const char *dirpath,
+ uint32_t filter, sys_notify_callback_t callback,
+ void *private, void **handle)
+{
+ return ctx->notify_watch(ctx, dirpath, filter, callback, private, handle);
+}
+
+/*
+ register a notify backend
+*/
+NTSTATUS sys_notify_register(struct sys_notify_backend *backend)
+{
+ DLIST_ADD(backends, backend);
+ return NT_STATUS_OK;
+}
diff --git a/source4/ntvfs/sysdep/sys_notify.h b/source4/ntvfs/sysdep/sys_notify.h
new file mode 100644
index 0000000000..9ad5ed7555
--- /dev/null
+++ b/source4/ntvfs/sysdep/sys_notify.h
@@ -0,0 +1,52 @@
+/*
+ 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.
+*/
+
+#include "librpc/gen_ndr/notify.h"
+
+struct sys_notify_context;
+
+typedef void (*sys_notify_callback_t)(struct sys_notify_context *,
+ void *, struct notify_event *ev);
+
+struct sys_notify_context {
+ struct event_context *ev;
+ void *private; /* for use of backend */
+ NTSTATUS (*notify_watch)(struct sys_notify_context *ctx, const char *dirpath,
+ uint32_t filter, sys_notify_callback_t callback,
+ void *private, void **handle);
+ const char *name;
+};
+
+struct sys_notify_backend {
+ struct sys_notify_backend *next, *prev;
+ const char *name;
+ NTSTATUS (*notify_watch)(struct sys_notify_context *ctx, const char *dirpath,
+ uint32_t filter, sys_notify_callback_t callback,
+ void *private, void **handle);
+};
+
+NTSTATUS sys_notify_register(struct sys_notify_backend *backend);
+struct sys_notify_context *sys_notify_init(int snum,
+ TALLOC_CTX *mem_ctx,
+ struct event_context *ev);
+NTSTATUS sys_notify_watch(struct sys_notify_context *ctx, const char *dirpath,
+ uint32_t filter, sys_notify_callback_t callback,
+ void *private, void **handle);
+
generated by cgit (git 2.34.1) at 2024-12-19 00:25:21 +0000