diff options
Diffstat (limited to 'source3/smbd')
| -rw-r--r-- | source3/smbd/notify.c | 5 | ||||
| -rw-r--r-- | source3/smbd/notify_inotify.c | 497 | ||||
| -rw-r--r-- | source3/smbd/notify_internal.c | 661 |
3 files changed, 987 insertions, 176 deletions
diff --git a/source3/smbd/notify.c b/source3/smbd/notify.c index d920633b0a..4c82b9fca8 100644 --- a/source3/smbd/notify.c +++ b/source3/smbd/notify.c @@ -529,11 +529,6 @@ BOOL init_change_notify(void) { 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()); diff --git a/source3/smbd/notify_inotify.c b/source3/smbd/notify_inotify.c index 64ea62ff74..8bb0096dcc 100644 --- a/source3/smbd/notify_inotify.c +++ b/source3/smbd/notify_inotify.c @@ -1,27 +1,33 @@ +/* + 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> @@ -46,218 +52,367 @@ static int inotify_rm_watch(int fd, int wd) } #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); +} diff --git a/source3/smbd/notify_internal.c b/source3/smbd/notify_internal.c new file mode 100644 index 0000000000..91fa8a1d78 --- /dev/null +++ b/source3/smbd/notify_internal.c @@ -0,0 +1,661 @@ +/* + 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); + } + } +} |