+++ /dev/null
-/*
- * Unix SMB/CIFS implementation.
- *
- * Support for change notify using OneFS's file event notification system
- *
- * Copyright (C) Andrew Tridgell, 2006
- * Copyright (C) Steven Danneman, 2008
- *
- * 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 3 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, see <http://www.gnu.org/licenses/>.
- */
-
-/* Implement handling of change notify requests on files and directories using
- * Isilon OneFS's "ifs event" file notification system.
- *
- * The structure of this file is based off the implementation of change notify
- * using the inotify system calls in smbd/notify_inotify.c */
-
-/* TODO: We could reduce the number of file descriptors used by merging
- * multiple watch requests on the same directory into the same
- * onefs_notify_watch_context. To do this we'd need mux/demux routines that
- * when receiving an event on that watch context would check it against the
- * CompletionFilter and WatchTree of open SMB requests, and return notify
- * events back to the proper SMB requests */
-
-#include "includes.h"
-#include "onefs.h"
-
-#include <ifs/ifs_types.h>
-#include <ifs/ifs_syscalls.h>
-#include <isi_util/syscalls.h>
-
-#include <sys/event.h>
-
-#define ONEFS_IFS_EVENT_MAX_NUM 8
-#define ONEFS_IFS_EVENT_MAX_BYTES (ONEFS_IFS_EVENT_MAX_NUM * \
- sizeof(struct ifs_event))
-
-struct onefs_notify_watch_context {
- struct sys_notify_context *ctx;
- int watch_fd;
- ino_t watch_lin;
- const char *path;
- int ifs_event_fd;
- uint32_t ifs_filter; /* the ifs event mask */
- uint32_t smb_filter; /* the windows completion filter */
- void (*callback)(struct sys_notify_context *ctx,
- void *private_data,
- struct notify_event *ev);
- void *private_data;
-};
-
-/**
- * Conversion map from a SMB completion filter to an IFS event mask.
- */
-static const struct {
- uint32_t smb_filter;
- uint32_t ifs_filter;
-} onefs_notify_conv[] = {
- {FILE_NOTIFY_CHANGE_FILE_NAME,
- NOTE_CREATE | NOTE_DELETE | NOTE_RENAME_FROM | NOTE_RENAME_TO},
- {FILE_NOTIFY_CHANGE_DIR_NAME,
- NOTE_CREATE | NOTE_DELETE | NOTE_RENAME_FROM | NOTE_RENAME_TO},
- {FILE_NOTIFY_CHANGE_ATTRIBUTES,
- NOTE_CREATE | NOTE_DELETE | NOTE_RENAME_FROM | NOTE_RENAME_TO |
- NOTE_ATTRIB},
- {FILE_NOTIFY_CHANGE_SIZE,
- NOTE_SIZE | NOTE_EXTEND},
- {FILE_NOTIFY_CHANGE_LAST_WRITE,
- NOTE_WRITE | NOTE_ATTRIB},
- /* OneFS doesn't set atime by default, but we can somewhat fake it by
- * notifying for other events that imply ACCESS */
- {FILE_NOTIFY_CHANGE_LAST_ACCESS,
- NOTE_WRITE | NOTE_ATTRIB},
- /* We don't have an ifs_event for the setting of create time, but we
- * can fake by notifying when a "new" file is created via rename */
- {FILE_NOTIFY_CHANGE_CREATION,
- NOTE_RENAME_TO},
- {FILE_NOTIFY_CHANGE_SECURITY,
- NOTE_SECURITY},
- /* Unsupported bits
- FILE_NOTIFY_CHANGE_EA (no EAs in OneFS)
- FILE_NOTIFY_CHANGE_STREAM_NAME (no ifs_event equivalent)
- FILE_NOTIFY_CHANGE_STREAM_SIZE (no ifs_event equivalent)
- FILE_NOTIFY_CHANGE_STREAM_WRITE (no ifs_event equivalent) */
-};
-
-#define ONEFS_NOTIFY_UNSUPPORTED (FILE_NOTIFY_CHANGE_LAST_ACCESS | \
- FILE_NOTIFY_CHANGE_CREATION | \
- FILE_NOTIFY_CHANGE_EA | \
- FILE_NOTIFY_CHANGE_STREAM_NAME | \
- FILE_NOTIFY_CHANGE_STREAM_SIZE | \
- FILE_NOTIFY_CHANGE_STREAM_WRITE)
-
-/**
- * Convert Windows/SMB filter/flags to IFS event filter.
- *
- * @param[in] smb_filter Windows Completion Filter sent in the SMB
- *
- * @return ifs event filter mask
- */
-static uint32_t
-onefs_notify_smb_filter_to_ifs_filter(uint32_t smb_filter)
-{
- int i;
- uint32_t ifs_filter = 0x0;
-
- for (i=0;i<ARRAY_SIZE(onefs_notify_conv);i++) {
- if (onefs_notify_conv[i].smb_filter & smb_filter) {
- ifs_filter |= onefs_notify_conv[i].ifs_filter;
- }
- }
-
- return ifs_filter;
-}
-
-/**
- * Convert IFS filter/flags to a Windows notify action.
- *
- * Returns Win notification actions, types (1-5).
- *
- * @param[in] smb_filter Windows Completion Filter sent in the SMB
- * @param[in] ifs_filter Returned from the kernel in the ifs_event
- *
- * @return 0 if there are no more relevant flags.
- */
-static int
-onefs_notify_ifs_filter_to_smb_action(uint32_t smb_filter, uint32_t ifs_filter)
-{
- /* Handle Windows special cases, before modifying events bitmask */
-
- /* Special case 1: win32api->MoveFile needs to send a modified
- * notification on the new file, if smb_filter == ATTRIBUTES.
- * Here we handle the case where two separate ATTR & NAME notifications
- * have been registered. We handle the case where both bits are set in
- * the same registration in onefs_notify_dispatch() */
- if ((smb_filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) &&
- !(smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (ifs_filter & NOTE_FILE) && (ifs_filter & NOTE_RENAME_TO))
- {
- return NOTIFY_ACTION_MODIFIED;
- }
-
- /* Special case 2: Writes need to send a modified
- * notification on the file, if smb_filter = ATTRIBUTES. */
- if ((smb_filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) &&
- (ifs_filter & NOTE_FILE) && (ifs_filter & NOTE_WRITE))
- {
- return NOTIFY_ACTION_MODIFIED;
- }
-
- /* Loop because some events may be filtered out. Eventually all
- * relevant events will be taken care of and returned. */
- while (1) {
- if (ifs_filter & NOTE_CREATE) {
- ifs_filter &= ~NOTE_CREATE;
- if ((smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (ifs_filter & NOTE_FILE))
- return NOTIFY_ACTION_ADDED;
- if ((smb_filter & FILE_NOTIFY_CHANGE_DIR_NAME) &&
- (ifs_filter & NOTE_DIRECTORY))
- return NOTIFY_ACTION_ADDED;
- }
- else if (ifs_filter & NOTE_DELETE) {
- ifs_filter &= ~NOTE_DELETE;
- if ((smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (ifs_filter & NOTE_FILE))
- return NOTIFY_ACTION_REMOVED;
- if ((smb_filter & FILE_NOTIFY_CHANGE_DIR_NAME) &&
- (ifs_filter & NOTE_DIRECTORY))
- return NOTIFY_ACTION_REMOVED;
- }
- else if (ifs_filter & NOTE_WRITE) {
- ifs_filter &= ~NOTE_WRITE;
- if ((smb_filter & FILE_NOTIFY_CHANGE_LAST_WRITE) ||
- (smb_filter & FILE_NOTIFY_CHANGE_LAST_ACCESS))
- return NOTIFY_ACTION_MODIFIED;
- }
- else if ((ifs_filter & NOTE_SIZE) || (ifs_filter & NOTE_EXTEND)) {
- ifs_filter &= ~NOTE_SIZE;
- ifs_filter &= ~NOTE_EXTEND;
-
- /* TODO: Do something on NOTE_DIR? */
- if ((smb_filter & FILE_NOTIFY_CHANGE_SIZE) &&
- (ifs_filter & NOTE_FILE))
- return NOTIFY_ACTION_MODIFIED;
- }
- else if (ifs_filter & NOTE_ATTRIB) {
- ifs_filter &= ~NOTE_ATTRIB;
- /* NOTE_ATTRIB needs to be converted to a
- * LAST_WRITE as well, because we need to send
- * LAST_WRITE when the mtime changes. Looking into
- * better alternatives as this causes extra LAST_WRITE
- * notifications. We also return LAST_ACCESS as a
- * modification to attribs implies this. */
- if ((smb_filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) ||
- (smb_filter & FILE_NOTIFY_CHANGE_LAST_WRITE) ||
- (smb_filter & FILE_NOTIFY_CHANGE_LAST_ACCESS))
- return NOTIFY_ACTION_MODIFIED;
- }
- else if (ifs_filter & NOTE_LINK) {
- ifs_filter &= ~NOTE_LINK;
- /* NOTE_LINK will send out NO notifications */
- }
- else if (ifs_filter & NOTE_REVOKE) {
- ifs_filter &= ~NOTE_REVOKE;
- /* NOTE_REVOKE will send out NO notifications */
- }
- else if (ifs_filter & NOTE_RENAME_FROM) {
- ifs_filter &= ~NOTE_RENAME_FROM;
-
- if (((smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (ifs_filter & NOTE_FILE)) ||
- ((smb_filter & FILE_NOTIFY_CHANGE_DIR_NAME) &&
- (ifs_filter & NOTE_DIRECTORY))) {
- /* Check if this is a RENAME, not a MOVE */
- if (ifs_filter & NOTE_RENAME_SAMEDIR) {
- /* Remove the NOTE_RENAME_SAMEDIR, IFF
- * RENAME_TO is not in this event */
- if (!(ifs_filter & NOTE_RENAME_TO))
- ifs_filter &=
- ~NOTE_RENAME_SAMEDIR;
- return NOTIFY_ACTION_OLD_NAME;
- }
- return NOTIFY_ACTION_REMOVED;
- }
- }
- else if (ifs_filter & NOTE_RENAME_TO) {
- ifs_filter &= ~NOTE_RENAME_TO;
-
- if (((smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (ifs_filter & NOTE_FILE)) ||
- ((smb_filter & FILE_NOTIFY_CHANGE_DIR_NAME) &&
- (ifs_filter & NOTE_DIRECTORY))) {
- /* Check if this is a RENAME, not a MOVE */
- if (ifs_filter & NOTE_RENAME_SAMEDIR) {
- /* Remove the NOTE_RENAME_SAMEDIR, IFF
- * RENAME_FROM is not in this event */
- if (!(ifs_filter & NOTE_RENAME_FROM))
- ifs_filter &=
- ~NOTE_RENAME_SAMEDIR;
- return NOTIFY_ACTION_NEW_NAME;
- }
- return NOTIFY_ACTION_ADDED;
- }
- /* RAW-NOTIFY shows us that a rename triggers a
- * creation time change */
- if ((smb_filter & FILE_NOTIFY_CHANGE_CREATION) &&
- (ifs_filter & NOTE_FILE))
- return NOTIFY_ACTION_MODIFIED;
- }
- else if (ifs_filter & NOTE_SECURITY) {
- ifs_filter &= ~NOTE_SECURITY;
-
- if (smb_filter & FILE_NOTIFY_CHANGE_SECURITY)
- return NOTIFY_ACTION_MODIFIED;
- } else {
- /* No relevant flags found */
- return 0;
- }
- }
-}
-
-/**
- * Retrieve a directory path of a changed file, relative to the watched dir
- *
- * @param[in] wc watch context for the returned event
- * @param[in] e ifs_event notification returned from the kernel
- * @param[out] path name relative to the watched dir. This is talloced
- * off of wc and needs to be freed by the caller.
- *
- * @return true on success
- *
- * TODO: This function currently doesn't handle path names with multiple
- * encodings. enc_get_lin_path() should be used in the future to convert
- * each path segment's encoding to UTF-8
- */
-static bool
-get_ifs_event_path(struct onefs_notify_watch_context *wc, struct ifs_event *e,
- char **path)
-{
- char *path_buf = NULL;
- size_t pathlen = 0;
- int error = 0;
-
- SMB_ASSERT(path);
-
- /* Lookup the path from watch_dir through our parent dir */
- if (e->namelen > 0) {
- error = lin_get_path(wc->watch_lin,
- e->parent_lin,
- HEAD_SNAPID,
- e->parent_parent_lin,
- e->parent_name_hash,
- &pathlen, &path_buf);
- if (!error) {
- /* Only add slash if a path exists in path_buf from
- * lin_get_path call. Windows does not expect a
- * leading '/' */
- if (pathlen > 0)
- *path = talloc_asprintf(wc, "%s/%s",
- path_buf, e->name);
- else
- *path = talloc_asprintf(wc, "%s", e->name);
- SAFE_FREE(path_buf);
- }
- }
-
- /* If ifs_event didn't return a name, or we errored out of our intial
- * path lookup, try again using the lin of the changed file */
- if (!(*path)) {
- error = lin_get_path(wc->watch_lin,
- e->lin,
- HEAD_SNAPID,
- e->parent_lin,
- e->name_hash,
- &pathlen, &path_buf);
- if (error) {
- /* It's possible that both the lin and the parent lin
- * are invalid (or not given) -- we will skip these
- * events. */
- DEBUG(3,("Path lookup failed. LINS are invalid: "
- "e->lin: 0x%llu, e->parent_lin: 0x%llu, "
- "e->parent_parent_lin: 0x%llu\n",
- e->lin, e->parent_lin, e->parent_parent_lin));
- SAFE_FREE(path_buf);
- return false;
- } else {
- *path = talloc_asprintf(wc, "%s", path_buf);
- DEBUG(5, ("Using path from event LIN = %s\n",
- path_buf));
- SAFE_FREE(path_buf);
- }
- }
-
- /* Replacement of UNIX slashes with WIN slashes is handled at a
- * higher layer. */
-
- return true;
-}
-
-/**
- * Dispatch one OneFS notify event to the general Samba code
- *
- * @param[in] wc watch context for the returned event
- * @param[in] e event returned from the kernel
- *
- * @return nothing
- */
-static void
-onefs_notify_dispatch(struct onefs_notify_watch_context *wc,
- struct ifs_event *e)
-{
- char *path = NULL;
- struct notify_event ne;
-
- DEBUG(5, ("Retrieved ifs event from kernel: lin=%#llx, ifs_events=%#x, "
- "parent_lin=%#llx, namelen=%d, name=\"%s\"\n",
- e->lin, e->events, e->parent_lin, e->namelen, e->name));
-
- /* Check validity of event returned from kernel */
- if (e->lin == 0) {
- /* The lin == 0 specifies 1 of 2 cases:
- * 1) We are out of events. The kernel has a limited
- * amount (somewhere near 90000)
- * 2) Split nodes have merged back and had data written
- * to them -- thus we've missed some of those events. */
- DEBUG(3, ("We've missed some kernel ifs events!\n"));
-
- /* Alert higher level to the problem so it returns catch-all
- * response to the client */
- ne.path = NULL;
- ne.action = 0;
- wc->callback(wc->ctx, wc->private_data, &ne);
- }
-
- if (e->lin == wc->watch_lin) {
- /* Windows doesn't report notifications on root
- * watched directory */
- /* TODO: This should be abstracted out to the general layer
- * instead of being handled in every notify provider */
- DEBUG(5, ("Skipping notification on root of the watched "
- "path.\n"));
- return;
- }
-
- /* Retrieve the full path for the ifs event name */
- if(!get_ifs_event_path(wc, e, &path)) {
- DEBUG(3, ("Failed to convert the ifs_event lins to a path. "
- "Skipping this event\n"));
- return;
- }
-
- if (!strncmp(path, ".ifsvar", 7)) {
- /* Skip notifications on file if its in ifs configuration
- * directory */
- goto clean;
- }
-
- ne.path = path;
-
- /* Convert ifs event mask to an smb action mask */
- ne.action = onefs_notify_ifs_filter_to_smb_action(wc->smb_filter,
- e->events);
-
- DEBUG(5, ("Converted smb_filter=%#x, ifs_events=%#x, to "
- "ne.action = %d, for ne.path = %s\n",
- wc->smb_filter, e->events, ne.action, ne.path));
-
- if (!ne.action)
- goto clean;
-
- /* Return notify_event to higher level */
- wc->callback(wc->ctx, wc->private_data, &ne);
-
- /* SMB expects a file rename/move to generate three actions, a
- * rename_from/delete on the from file, a rename_to/create on the to
- * file, and a modify for the rename_to file. If we have two separate
- * notifications registered for ATTRIBUTES and FILENAME, this case will
- * be handled by separate ifs_events in
- * onefs_notify_ifs_filter_to_smb_action(). If both bits are registered
- * in the same notification, we must send an extra MODIFIED action
- * here. */
- if ((wc->smb_filter & FILE_NOTIFY_CHANGE_ATTRIBUTES) &&
- (wc->smb_filter & FILE_NOTIFY_CHANGE_FILE_NAME) &&
- (e->events & NOTE_FILE) && (e->events & NOTE_RENAME_TO))
- {
- ne.action = NOTIFY_ACTION_MODIFIED;
- wc->callback(wc->ctx, wc->private_data, &ne);
- }
-
- /* FALLTHROUGH */
-clean:
- talloc_free(path);
- return;
-}
-
-/**
- * Callback when the kernel has some events for us
- *
- * Read events off ifs event fd and pass them to our dispatch function
- *
- * @param ev context of all tevents registered in the smbd
- * @param fde tevent struct specific to one ifs event channel
- * @param flags tevent flags passed when we added our ifs event channel fd to
- * the main loop
- * @param private_data onefs_notify_watch_context specific to this ifs event
- * channel
- *
- * @return nothing
- */
-static void
-onefs_notify_handler(struct event_context *ev,
- struct fd_event *fde,
- uint16_t flags,
- void *private_data)
-{
- struct onefs_notify_watch_context *wc = NULL;
- struct ifs_event ifs_events[ONEFS_IFS_EVENT_MAX_NUM];
- ssize_t nread = 0;
- int count = 0;
- int i = 0;
-
- wc = talloc_get_type(private_data, struct onefs_notify_watch_context);
-
- /* Read as many ifs events from the notify channel as we can */
- nread = sys_read(wc->ifs_event_fd, &ifs_events,
- ONEFS_IFS_EVENT_MAX_BYTES);
- if (nread == 0) {
- DEBUG(0,("No data found while reading ifs event fd?!\n"));
- return;
- }
- if (nread < 0) {
- DEBUG(0,("Failed to read ifs event data: %s\n",
- strerror(errno)));
- return;
- }
-
- count = nread / sizeof(struct ifs_event);
-
- DEBUG(5, ("Got %d notification events in %d bytes.\n", count, nread));
-
- /* Dispatch ifs_events one-at-a-time to higher level */
- for (i=0; i < count; i++) {
- onefs_notify_dispatch(wc, &ifs_events[i]);
- }
-}
-
-/**
- * Destroy the ifs event channel
- *
- * This is called from talloc_free() when the generic Samba notify layer frees
- * the onefs_notify_watch_context.
- *
- * @param[in] wc pointer to watch context which is being destroyed
- *
- * return 0 on success
-*/
-static int
-onefs_watch_destructor(struct onefs_notify_watch_context *wc)
-{
- /* The ifs_event_fd will re de-registered from the event loop by
- * another destructor triggered from the freeing of this wc */
- close(wc->ifs_event_fd);
- return 0;
-}
-
-/**
- * Register a single change notify watch request.
- *
- * Open an event listener on a directory to watch for modifications. This
- * channel is closed by a destructor when the caller calls talloc_free()
- * on *handle.
- *
- * @param[in] vfs_handle handle given to most VFS operations
- * @param[in] ctx context (conn and tevent) for this connection
- * @param[in] e filter and path of client's notify request
- * @param[in] callback function to call when file notification event is received
- * from the kernel, passing that event up to Samba's
- * generalized change notify layer
- * @param[in] private_data opaque data given to us by the general change notify
- * layer which must be returned in the callback function
- * @param[out] handle_p handle returned to generalized change notify layer used
- * to close the event channel when notification is
- * cancelled
- *
- * @return NT_STATUS_OK unless error
- */
-NTSTATUS
-onefs_notify_watch(vfs_handle_struct *vfs_handle,
- struct sys_notify_context *ctx,
- struct notify_entry *e,
- void (*callback)(struct sys_notify_context *ctx,
- void *private_data,
- struct notify_event *ev),
- void *private_data,
- void *handle_p)
-{
- int ifs_event_fd = -1;
- uint32_t ifs_filter = 0;
- uint32_t smb_filter = e->filter;
- bool watch_tree = !!e->subdir_filter;
- struct onefs_notify_watch_context *wc = NULL;
- void **handle = (void **)handle_p;
- SMB_STRUCT_STAT sbuf;
- NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
-
- /* Fallback to default Samba implementation if kernel CN is disabled */
- if (!lp_kernel_change_notify(vfs_handle->conn->params)) {
- (*handle) = NULL;
- return NT_STATUS_OK;
- }
-
- /* The OneFS open path should always give us a valid fd on a directory*/
- SMB_ASSERT(e->dir_fd >= 0);
-
- /* Always set e->filter to 0 so we don't fallback on the default change
- * notify backend. It's not cluster coherent or cross-protocol so we
- * can't guarantee correctness using it. */
- e->filter = 0;
- e->subdir_filter = 0;
-
- /* Snapshots do not currently allow event listeners. See Isilon
- * bug 33476 for an example of .snapshot debug spew that can occur. */
- if (e->dir_id.extid != HEAD_SNAPID)
- return NT_STATUS_INVALID_PARAMETER;
-
- /* Convert Completion Filter mask to IFS Event mask */
- ifs_filter = onefs_notify_smb_filter_to_ifs_filter(smb_filter);
-
- if (smb_filter & ONEFS_NOTIFY_UNSUPPORTED) {
- /* One or more of the filter bits could not be fully handled by
- * the ifs_event system. To be correct, if we cannot service a
- * bit in the completion filter we should return
- * NT_STATUS_NOT_IMPLEMENTED to let the client know that they
- * won't be receiving all the notify events that they asked for.
- * Unfortunately, WinXP clients cache this error message, stop
- * trying to send any notify requests at all, and instead return
- * NOT_IMPLEMENTED to all requesting apps without ever sending a
- * message to us. Thus we lie, and say we can service all bits,
- * but simply don't return actions for the filter bits we can't
- * detect or fully implement. */
- DEBUG(3,("One or more of the Windows completion filter bits "
- "for \"%s\" could not be fully handled by the "
- "ifs_event system. The failed bits are "
- "smb_filter=%#x\n",
- e->path, smb_filter & ONEFS_NOTIFY_UNSUPPORTED));
- }
-
- if (ifs_filter == 0) {
- /* None of the filter bits given are supported by the ifs_event
- * system. Don't create a kernel notify channel, but mock
- * up a fake handle for the caller. */
- DEBUG(3,("No bits in the Windows completion filter could be "
- "translated to ifs_event mask for \"%s\", "
- "smb_filter=%#x\n", e->path, smb_filter));
- (*handle) = NULL;
- return NT_STATUS_OK;
- }
-
- /* Register an ifs event channel for this watch request */
- ifs_event_fd = ifs_create_listener(watch_tree ?
- EVENT_RECURSIVE :
- EVENT_CHILDREN,
- ifs_filter,
- e->dir_fd);
- if (ifs_event_fd < 0) {
- DEBUG(0,("Failed to create listener for %s with \"%s\". "
- "smb_filter=0x%x, ifs_filter=0x%x, watch_tree=%u\n",
- strerror(errno), e->path, smb_filter, ifs_filter,
- watch_tree));
- return map_nt_error_from_unix(errno);
- }
-
- /* Create a watch context to track this change notify request */
- wc = talloc(ctx, struct onefs_notify_watch_context);
- if (wc == NULL) {
- status = NT_STATUS_NO_MEMORY;
- goto err;
- }
-
- /* Get LIN for directory */
- if (sys_fstat(e->dir_fd, &sbuf)) {
- DEBUG(0, ("stat on directory fd failed: %s\n",
- strerror(errno)));
- status = map_nt_error_from_unix(errno);
- goto err;
- }
-
- if (sbuf.st_ino == 0) {
- DEBUG(0, ("0 LIN found!\n"));
- goto err;
- }
-
- wc->ctx = ctx;
- wc->watch_fd = e->dir_fd;
- wc->watch_lin = sbuf.st_ino;
- wc->ifs_event_fd = ifs_event_fd;
- wc->ifs_filter = ifs_filter;
- wc->smb_filter = smb_filter;
- wc->callback = callback;
- wc->private_data = private_data;
- wc->path = talloc_strdup(wc, e->path);
- if (wc->path == NULL) {
- status = NT_STATUS_NO_MEMORY;
- goto err;
- }
-
- (*handle) = wc;
-
- /* The caller frees the handle to stop watching */
- talloc_set_destructor(wc, onefs_watch_destructor);
-
- /* Add a tevent waiting for the ifs event fd to be readable */
- event_add_fd(ctx->ev, wc, wc->ifs_event_fd, EVENT_FD_READ,
- onefs_notify_handler, wc);
-
- DEBUG(10, ("Watching for changes on \"%s\" smb_filter=0x%x, "
- "ifs_filter=0x%x, watch_tree=%d, ifs_event_fd=%d, "
- "dir_fd=%d, dir_lin=0x%llx\n",
- e->path, smb_filter, ifs_filter, watch_tree,
- ifs_event_fd, e->dir_fd, sbuf.st_ino));
-
- return NT_STATUS_OK;
-
-err:
- talloc_free(wc);
- SMB_ASSERT(ifs_event_fd >= 0);
- close(ifs_event_fd);
- return status;
-}
git.samba.org / samba.git / blobdiff