summaryrefslogtreecommitdiffstats
path: root/source3/modules/vfs_preopen.c
diff options
context:
space:
mode:
Diffstat (limited to 'source3/modules/vfs_preopen.c')
-rw-r--r--source3/modules/vfs_preopen.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/source3/modules/vfs_preopen.c b/source3/modules/vfs_preopen.c
new file mode 100644
index 0000000..d1327f6
--- /dev/null
+++ b/source3/modules/vfs_preopen.c
@@ -0,0 +1,757 @@
+/*
+ * Force a readahead of files by opening them and reading the first bytes
+ *
+ * Copyright (C) Volker Lendecke 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 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 "includes.h"
+#include "system/filesys.h"
+#include "smbd/smbd.h"
+#include "lib/util/sys_rw.h"
+#include "lib/util/sys_rw_data.h"
+#include "lib/util/smb_strtox.h"
+#include "lib/util_matching.h"
+#include "lib/global_contexts.h"
+
+static int vfs_preopen_debug_level = DBGC_VFS;
+
+#undef DBGC_CLASS
+#define DBGC_CLASS vfs_preopen_debug_level
+
+#define PREOPEN_MAX_DIGITS 19
+#define PREOPEN_MAX_NUMBER (uint64_t)9999999999999999999ULL
+
+struct preopen_state;
+
+struct preopen_helper {
+ struct preopen_state *state;
+ struct tevent_fd *fde;
+ pid_t pid;
+ int fd;
+ bool busy;
+};
+
+struct preopen_state {
+ int num_helpers;
+ struct preopen_helper *helpers;
+
+ size_t to_read; /* How many bytes to read in children? */
+ int queue_max;
+
+ int queue_dbglvl; /* DBGLVL_DEBUG by default */
+ int nomatch_dbglvl; /* DBGLVL_INFO by default */
+ int match_dbglvl; /* DBGLVL_INFO by default */
+ int reset_dbglvl; /* DBGLVL_INFO by default */
+ int nodigits_dbglvl; /* DBGLVL_WARNING by default */
+ int founddigits_dbglvl; /* DBGLVL_NOTICE by default */
+ int push_dbglvl; /* DBGLVL_NOTICE by default */
+
+ char *template_fname; /* Filename to be sent to children */
+ size_t number_start; /* start offset into "template_fname" */
+ int num_digits; /* How many digits is the number long? */
+
+ uint64_t fnum_sent; /* last fname sent to children */
+
+ uint64_t fnum_queue_end;/* last fname to be sent, based on
+ * last open call + preopen:queuelen
+ */
+
+ struct samba_path_matching *preopen_names;
+ ssize_t last_match_idx; /* remember the last match */
+};
+
+static void preopen_helper_destroy(struct preopen_helper *c)
+{
+ int status;
+ TALLOC_FREE(c->fde);
+ close(c->fd);
+ c->fd = -1;
+ kill(c->pid, SIGKILL);
+ waitpid(c->pid, &status, 0);
+ c->busy = true;
+}
+
+static void preopen_queue_run(struct preopen_state *state)
+{
+ char *pdelimiter;
+ char delimiter;
+
+ DBG_PREFIX(state->queue_dbglvl, ("START: "
+ "last_fname[%s] start_offset=%zu num_digits=%d "
+ "last_pushed_num=%"PRIu64" queue_end_num=%"PRIu64" num_helpers=%d\n",
+ state->template_fname,
+ state->number_start,
+ state->num_digits,
+ state->fnum_sent,
+ state->fnum_queue_end,
+ state->num_helpers));
+
+ pdelimiter = state->template_fname + state->number_start
+ + state->num_digits;
+ delimiter = *pdelimiter;
+
+ while (state->fnum_sent < state->fnum_queue_end) {
+
+ ssize_t written;
+ size_t to_write;
+ int helper;
+
+ for (helper=0; helper<state->num_helpers; helper++) {
+ if (state->helpers[helper].busy) {
+ continue;
+ }
+ break;
+ }
+ if (helper == state->num_helpers) {
+ /* everyone is busy */
+ DBG_PREFIX(state->queue_dbglvl, ("BUSY: "
+ "template_fname[%s] start_offset=%zu num_digits=%d "
+ "last_pushed_num=%"PRIu64" queue_end_num=%"PRIu64"\n",
+ state->template_fname,
+ state->number_start,
+ state->num_digits,
+ state->fnum_sent,
+ state->fnum_queue_end));
+ return;
+ }
+
+ snprintf(state->template_fname + state->number_start,
+ state->num_digits + 1,
+ "%.*llu", state->num_digits,
+ (long long unsigned int)(state->fnum_sent + 1));
+ *pdelimiter = delimiter;
+
+ DBG_PREFIX(state->push_dbglvl, (
+ "PUSH: fullpath[%s] to helper(idx=%d)\n",
+ state->template_fname, helper));
+
+ to_write = talloc_get_size(state->template_fname);
+ written = write_data(state->helpers[helper].fd,
+ state->template_fname, to_write);
+ state->helpers[helper].busy = true;
+
+ if (written != to_write) {
+ preopen_helper_destroy(&state->helpers[helper]);
+ }
+ state->fnum_sent += 1;
+ }
+ DBG_PREFIX(state->queue_dbglvl, ("END: "
+ "template_fname[%s] start_offset=%zu num_digits=%d "
+ "last_pushed_num=%"PRIu64" queue_end_num=%"PRIu64"\n",
+ state->template_fname,
+ state->number_start,
+ state->num_digits,
+ state->fnum_sent,
+ state->fnum_queue_end));
+}
+
+static void preopen_helper_readable(struct tevent_context *ev,
+ struct tevent_fd *fde, uint16_t flags,
+ void *priv)
+{
+ struct preopen_helper *helper = (struct preopen_helper *)priv;
+ struct preopen_state *state = helper->state;
+ ssize_t nread;
+ char c;
+
+ if ((flags & TEVENT_FD_READ) == 0) {
+ return;
+ }
+
+ nread = read(helper->fd, &c, 1);
+ if (nread <= 0) {
+ preopen_helper_destroy(helper);
+ return;
+ }
+
+ helper->busy = false;
+
+ DBG_PREFIX(state->queue_dbglvl, ("BEFORE: preopen_queue_run\n"));
+ preopen_queue_run(state);
+ DBG_PREFIX(state->queue_dbglvl, ("AFTER: preopen_queue_run\n"));
+}
+
+static int preopen_helpers_destructor(struct preopen_state *c)
+{
+ int i;
+
+ for (i=0; i<c->num_helpers; i++) {
+ if (c->helpers[i].fd == -1) {
+ continue;
+ }
+ preopen_helper_destroy(&c->helpers[i]);
+ }
+
+ return 0;
+}
+
+static bool preopen_helper_open_one(int sock_fd, char **pnamebuf,
+ size_t to_read, void *filebuf)
+{
+ char *namebuf = *pnamebuf;
+ ssize_t nread;
+ char c = 0;
+ int fd;
+
+ nread = 0;
+
+ do {
+ ssize_t thistime;
+
+ thistime = read(sock_fd, namebuf + nread,
+ talloc_get_size(namebuf) - nread);
+ if (thistime <= 0) {
+ return false;
+ }
+
+ nread += thistime;
+
+ if (nread == talloc_get_size(namebuf)) {
+ namebuf = talloc_realloc(
+ NULL, namebuf, char,
+ talloc_get_size(namebuf) * 2);
+ if (namebuf == NULL) {
+ return false;
+ }
+ *pnamebuf = namebuf;
+ }
+ } while (namebuf[nread - 1] != '\0');
+
+ fd = open(namebuf, O_RDONLY);
+ if (fd == -1) {
+ goto done;
+ }
+ nread = read(fd, filebuf, to_read);
+ close(fd);
+
+ done:
+ sys_write_v(sock_fd, &c, 1);
+ return true;
+}
+
+static bool preopen_helper(int fd, size_t to_read)
+{
+ char *namebuf;
+ void *readbuf;
+
+ namebuf = talloc_array(NULL, char, 1024);
+ if (namebuf == NULL) {
+ return false;
+ }
+
+ readbuf = talloc_size(NULL, to_read);
+ if (readbuf == NULL) {
+ TALLOC_FREE(namebuf);
+ return false;
+ }
+
+ while (preopen_helper_open_one(fd, &namebuf, to_read, readbuf)) {
+ ;
+ }
+
+ TALLOC_FREE(readbuf);
+ TALLOC_FREE(namebuf);
+ return false;
+}
+
+static NTSTATUS preopen_init_helper(struct preopen_helper *h)
+{
+ int fdpair[2];
+ NTSTATUS status;
+
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) == -1) {
+ status = map_nt_error_from_unix(errno);
+ DEBUG(10, ("socketpair() failed: %s\n", strerror(errno)));
+ return status;
+ }
+
+ h->pid = fork();
+
+ if (h->pid == -1) {
+ return map_nt_error_from_unix(errno);
+ }
+
+ if (h->pid == 0) {
+ close(fdpair[0]);
+ preopen_helper(fdpair[1], h->state->to_read);
+ exit(0);
+ }
+ close(fdpair[1]);
+ h->fd = fdpair[0];
+ h->fde = tevent_add_fd(global_event_context(), h->state, h->fd,
+ TEVENT_FD_READ, preopen_helper_readable, h);
+ if (h->fde == NULL) {
+ close(h->fd);
+ h->fd = -1;
+ return NT_STATUS_NO_MEMORY;
+ }
+ h->busy = false;
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS preopen_init_helpers(TALLOC_CTX *mem_ctx, size_t to_read,
+ int num_helpers, int queue_max,
+ struct preopen_state **presult)
+{
+ struct preopen_state *result;
+ int i;
+
+ result = talloc(mem_ctx, struct preopen_state);
+ if (result == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ result->num_helpers = num_helpers;
+ result->helpers = talloc_array(result, struct preopen_helper,
+ num_helpers);
+ if (result->helpers == NULL) {
+ TALLOC_FREE(result);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ result->to_read = to_read;
+ result->queue_max = queue_max;
+ result->template_fname = NULL;
+ result->fnum_sent = 0;
+ result->fnum_queue_end = 0;
+
+ for (i=0; i<num_helpers; i++) {
+ result->helpers[i].state = result;
+ result->helpers[i].fd = -1;
+ }
+
+ talloc_set_destructor(result, preopen_helpers_destructor);
+
+ for (i=0; i<num_helpers; i++) {
+ preopen_init_helper(&result->helpers[i]);
+ }
+
+ *presult = result;
+ return NT_STATUS_OK;
+}
+
+static void preopen_free_helpers(void **ptr)
+{
+ TALLOC_FREE(*ptr);
+}
+
+static struct preopen_state *preopen_state_get(vfs_handle_struct *handle)
+{
+ struct preopen_state *state;
+ NTSTATUS status;
+ const char *namelist;
+
+ if (SMB_VFS_HANDLE_TEST_DATA(handle)) {
+ SMB_VFS_HANDLE_GET_DATA(handle, state, struct preopen_state,
+ return NULL);
+ return state;
+ }
+
+ namelist = lp_parm_const_string(SNUM(handle->conn), "preopen", "names",
+ NULL);
+
+ if (namelist == NULL) {
+ return NULL;
+ }
+
+ status = preopen_init_helpers(
+ NULL,
+ lp_parm_int(SNUM(handle->conn), "preopen", "num_bytes", 1),
+ lp_parm_int(SNUM(handle->conn), "preopen", "helpers", 1),
+ lp_parm_int(SNUM(handle->conn), "preopen", "queuelen", 10),
+ &state);
+ if (!NT_STATUS_IS_OK(status)) {
+ return NULL;
+ }
+
+ state->queue_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "queue_log_level", DBGLVL_DEBUG);
+ state->nomatch_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "nomatch_log_level", DBGLVL_INFO);
+ state->match_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "match_log_level", DBGLVL_INFO);
+ state->reset_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "reset_log_level", DBGLVL_INFO);
+ state->nodigits_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "nodigits_log_level", DBGLVL_WARNING);
+ state->founddigits_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "founddigits_log_level", DBGLVL_NOTICE);
+ state->push_dbglvl = lp_parm_int(SNUM(handle->conn), "preopen", "push_log_level", DBGLVL_NOTICE);
+
+ if (lp_parm_bool(SNUM(handle->conn), "preopen", "posix-basic-regex", false)) {
+ status = samba_path_matching_regex_sub1_create(state,
+ namelist,
+ &state->preopen_names);
+ } else {
+ status = samba_path_matching_mswild_create(state,
+ true, /* case_sensitive */
+ namelist,
+ &state->preopen_names);
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(state);
+ return NULL;
+ }
+ state->last_match_idx = -1;
+
+ if (!SMB_VFS_HANDLE_TEST_DATA(handle)) {
+ SMB_VFS_HANDLE_SET_DATA(handle, state, preopen_free_helpers,
+ struct preopen_state, return NULL);
+ }
+
+ return state;
+}
+
+static bool preopen_parse_fname(const char *fname, uint64_t *pnum,
+ size_t *pstart_idx, int *pnum_digits)
+{
+ char digits[PREOPEN_MAX_DIGITS+1] = { 0, };
+ const char *p;
+ char *q = NULL;
+ unsigned long long num;
+ size_t start_idx = 0;
+ int num_digits = -1;
+ int error = 0;
+
+ if (*pstart_idx > 0 && *pnum_digits > 0) {
+ /*
+ * If the caller knowns
+ * how many digits are expected
+ * and on what position,
+ * we should copy the exact
+ * subset before we start
+ * parsing the string into a number
+ */
+
+ if (*pnum_digits > PREOPEN_MAX_DIGITS) {
+ /*
+ * a string with as much digits as
+ * PREOPEN_MAX_DIGITS is the longest
+ * string that would make any sense for us.
+ *
+ * The rest will be checked via
+ * smb_strtoull().
+ */
+ return false;
+ }
+ p = fname + *pstart_idx;
+ memcpy(digits, p, *pnum_digits);
+ p = digits;
+ start_idx = *pstart_idx;
+ goto parse;
+ }
+
+ p = strrchr_m(fname, '/');
+ if (p == NULL) {
+ p = fname;
+ }
+
+ p += 1;
+ while (p[0] != '\0') {
+ if (isdigit(p[0]) && isdigit(p[1]) && isdigit(p[2])) {
+ break;
+ }
+ p += 1;
+ }
+ if (*p == '\0') {
+ /* no digits around */
+ return false;
+ }
+
+ start_idx = (p - fname);
+
+parse:
+ num = smb_strtoull(p, (char **)&q, 10, &error, SMB_STR_STANDARD);
+ if (error != 0) {
+ return false;
+ }
+
+ if (num >= PREOPEN_MAX_NUMBER) {
+ /* overflow */
+ return false;
+ }
+
+ num_digits = (q - p);
+
+ if (*pnum_digits != -1 && *pnum_digits != num_digits) {
+ /*
+ * If the caller knowns how many digits
+ * it expects we should fail if we got something
+ * different.
+ */
+ return false;
+ }
+
+ *pnum = num;
+ *pstart_idx = start_idx;
+ *pnum_digits = num_digits;
+ return true;
+}
+
+static uint64_t num_digits_max_value(int num_digits)
+{
+ uint64_t num_max = 1;
+ int i;
+
+ if (num_digits < 1) {
+ return 0;
+ }
+ if (num_digits >= PREOPEN_MAX_DIGITS) {
+ return PREOPEN_MAX_NUMBER;
+ }
+
+ for (i = 0; i < num_digits; i++) {
+ num_max *= 10;
+ }
+
+ /*
+ * We actually want
+ * 9 instead of 10
+ * 99 instead of 100
+ * 999 instead of 1000
+ */
+ return num_max - 1;
+}
+
+static int preopen_openat(struct vfs_handle_struct *handle,
+ const struct files_struct *dirfsp,
+ const struct smb_filename *smb_fname,
+ struct files_struct *fsp,
+ const struct vfs_open_how *how)
+{
+ const char *dirname = dirfsp->fsp_name->base_name;
+ struct preopen_state *state;
+ int res;
+ uint64_t num;
+ uint64_t num_max;
+ NTSTATUS status;
+ char *new_template = NULL;
+ size_t new_start = 0;
+ int new_digits = -1;
+ size_t new_end = 0;
+ ssize_t match_idx = -1;
+ ssize_t replace_start = -1;
+ ssize_t replace_end = -1;
+ bool need_reset = false;
+
+ DBG_DEBUG("called on %s\n", smb_fname_str_dbg(smb_fname));
+
+ state = preopen_state_get(handle);
+ if (state == NULL) {
+ return SMB_VFS_NEXT_OPENAT(handle,
+ dirfsp,
+ smb_fname,
+ fsp,
+ how);
+ }
+
+ res = SMB_VFS_NEXT_OPENAT(handle, dirfsp, smb_fname, fsp, how);
+ if (res == -1) {
+ return -1;
+ }
+
+ if ((how->flags & O_ACCMODE) != O_RDONLY) {
+ return res;
+ }
+
+ /*
+ * Make sure we can later construct an absolute pathname
+ */
+ if (dirname[0] != '/') {
+ return res;
+ }
+ /*
+ * There's no point in preopen the directory itself.
+ */
+ if (ISDOT(smb_fname->base_name)) {
+ return res;
+ }
+ /*
+ * If we got an absolute path in
+ * smb_fname it's most likely the
+ * reopen via /proc/self/fd/$fd
+ */
+ if (smb_fname->base_name[0] == '/') {
+ return res;
+ }
+
+ status = samba_path_matching_check_last_component(state->preopen_names,
+ smb_fname->base_name,
+ &match_idx,
+ &replace_start,
+ &replace_end);
+ if (!NT_STATUS_IS_OK(status)) {
+ match_idx = -1;
+ }
+ if (match_idx < 0) {
+ DBG_PREFIX(state->nomatch_dbglvl, (
+ "No match with the preopen:names list by name[%s]\n",
+ smb_fname_str_dbg(smb_fname)));
+ return res;
+ }
+
+ if (replace_start != -1 && replace_end != -1) {
+ DBG_PREFIX(state->match_dbglvl, (
+ "Pattern(idx=%zd) from preopen:names list matched name[%s] hints(start=%zd,end=%zd)\n",
+ match_idx, smb_fname_str_dbg(smb_fname), replace_start, replace_end));
+ } else {
+ DBG_PREFIX(state->match_dbglvl, (
+ "Pattern(idx=%zd) from preopen:names list matched name[%s]\n",
+ match_idx, smb_fname_str_dbg(smb_fname)));
+ }
+
+ new_template = talloc_asprintf(
+ state, "%s/%s",
+ dirname, smb_fname->base_name);
+ if (new_template == NULL) {
+ DBG_ERR("talloc_asprintf(%s/%s) failed\n",
+ dirname, smb_fname_str_dbg(smb_fname));
+ return res;
+ }
+
+ if (replace_start != -1 && replace_end != -1) {
+ size_t dirofs = strlen(dirname) + 1;
+ new_start = dirofs + replace_start;
+ new_digits = replace_end - replace_start;
+ }
+
+ if (!preopen_parse_fname(new_template, &num,
+ &new_start, &new_digits)) {
+ DBG_PREFIX(state->nodigits_dbglvl, (
+ "Pattern(idx=%zd) no valid digits found on fullpath[%s]\n",
+ match_idx, new_template));
+ TALLOC_FREE(new_template);
+ return res;
+ }
+ new_end = new_start + new_digits;
+
+ DBG_PREFIX(state->founddigits_dbglvl, (
+ "Pattern(idx=%zd) found num_digits[%d] start_offset[%zd] parsed_num[%"PRIu64"] fullpath[%s]\n",
+ match_idx, new_digits, new_start, num, new_template));
+
+ if (state->last_match_idx != match_idx) {
+ /*
+ * If a different pattern caused the match
+ * we better reset the queue
+ */
+ if (state->last_match_idx != -1) {
+ DBG_PREFIX(state->reset_dbglvl, ("RESET: "
+ "pattern changed from idx=%zd to idx=%zd by fullpath[%s]\n",
+ state->last_match_idx, match_idx, new_template));
+ }
+ need_reset = true;
+ } else if (state->number_start != new_start) {
+ /*
+ * If the digits started at a different position
+ * we better reset the queue
+ */
+ DBG_PREFIX(state->reset_dbglvl, ("RESET: "
+ "start_offset changed from byte=%zd to byte=%zd by fullpath[%s]\n",
+ state->number_start, new_start, new_template));
+ need_reset = true;
+ } else if (state->num_digits != new_digits) {
+ /*
+ * If number of digits changed
+ * we better reset the queue
+ */
+ DBG_PREFIX(state->reset_dbglvl, ("RESET: "
+ "num_digits changed %d to %d by fullpath[%s]\n",
+ state->num_digits, new_digits, new_template));
+ need_reset = true;
+ } else if (strncmp(state->template_fname, new_template, new_start) != 0) {
+ /*
+ * If name before the digits changed
+ * we better reset the queue
+ */
+ DBG_PREFIX(state->reset_dbglvl, ("RESET: "
+ "leading pathprefix[%.*s] changed by fullpath[%s]\n",
+ (int)state->number_start, state->template_fname, new_template));
+ need_reset = true;
+ } else if (strcmp(state->template_fname + new_end, new_template + new_end) != 0) {
+ /*
+ * If name after the digits changed
+ * we better reset the queue
+ */
+ DBG_PREFIX(state->reset_dbglvl, ("RESET: "
+ "trailing suffix[%s] changed by fullpath[%s]\n",
+ state->template_fname + new_end, new_template));
+ need_reset = true;
+ }
+
+ if (need_reset) {
+ /*
+ * Reset the queue
+ */
+ state->fnum_sent = 0;
+ state->fnum_queue_end = 0;
+ state->last_match_idx = match_idx;
+ }
+
+ TALLOC_FREE(state->template_fname);
+ state->template_fname = new_template;
+ state->number_start = new_start;
+ state->num_digits = new_digits;
+
+ if (num > state->fnum_sent) {
+ /*
+ * Helpers were too slow, there's no point in reading
+ * files in helpers that we already read in the
+ * parent.
+ */
+ state->fnum_sent = num;
+ }
+
+ if ((state->fnum_queue_end != 0) /* Something was started earlier */
+ && (num < (state->fnum_queue_end - state->queue_max))) {
+ /*
+ * "num" is before the queue we announced. This means
+ * a new run is started.
+ */
+ state->fnum_sent = num;
+ }
+
+ num_max = num_digits_max_value(state->num_digits);
+ state->fnum_queue_end = MIN(num_max, num + state->queue_max);
+
+ DBG_PREFIX(state->queue_dbglvl, ("BEFORE: preopen_queue_run\n"));
+ preopen_queue_run(state);
+ DBG_PREFIX(state->queue_dbglvl, ("AFTER: preopen_queue_run\n"));
+
+ return res;
+}
+
+static struct vfs_fn_pointers vfs_preopen_fns = {
+ .openat_fn = preopen_openat,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_preopen_init(TALLOC_CTX *ctx)
+{
+ NTSTATUS status;
+
+ status = smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
+ "preopen",
+ &vfs_preopen_fns);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ vfs_preopen_debug_level = debug_add_class("preopen");
+ if (vfs_preopen_debug_level == -1) {
+ vfs_preopen_debug_level = DBGC_VFS;
+ DBG_ERR("Couldn't register custom debugging class!\n");
+ } else {
+ DBG_DEBUG("Debug class number of 'preopen': %d\n",
+ vfs_preopen_debug_level);
+ }
+
+ return NT_STATUS_OK;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 11:33:44 +0000