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56b7525125
Sorry for the mistake, but the LastDir singleton cache in vfs_ChDir() actually plays an important role. When we're processing a stream of SMB1/SMB2/SMB3 requests we don't want to add a chdir()/getcwd() system call pair on every request if they're all on the same connection and dealing with the same base path. I did some testing with a program that times 1,000,000 chdir() requests vs. 1,000,000 strcmp requests and it's a penalty of 10x doing the system calls. Just because it's old code, doesn't mean it's bad :-(. Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Thu Sep 13 21:31:42 CEST 2012 on sn-devel-104
135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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Unix SMB/Netbios implementation.
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smbd globals
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Copyright (C) Stefan Metzmacher 2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "lib/smbd_shim.h"
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#include "memcache.h"
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#include "messages.h"
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#include "tdb_compat.h"
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int aio_pending_size = 100; /* tevent supports 100 signals SA_SIGINFO */
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int outstanding_aio_calls = 0;
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#ifdef USE_DMAPI
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struct smbd_dmapi_context *dmapi_ctx = NULL;
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#endif
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bool dfree_broken = false;
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/* how many write cache buffers have been allocated */
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unsigned int allocated_write_caches = 0;
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const struct mangle_fns *mangle_fns = NULL;
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unsigned char *chartest = NULL;
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TDB_CONTEXT *tdb_mangled_cache = NULL;
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/*
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this determines how many characters are used from the original filename
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in the 8.3 mangled name. A larger value leads to a weaker hash and more collisions.
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The largest possible value is 6.
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*/
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unsigned mangle_prefix = 0;
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bool logged_ioctl_message = false;
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time_t last_smb_conf_reload_time = 0;
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time_t last_printer_reload_time = 0;
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pid_t background_lpq_updater_pid = -1;
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/****************************************************************************
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structure to hold a linked list of queued messages.
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for processing.
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****************************************************************************/
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uint32_t common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES|FLAGS2_EXTENDED_ATTRIBUTES;
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struct smb_trans_enc_state *partial_srv_trans_enc_ctx = NULL;
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struct smb_trans_enc_state *srv_trans_enc_ctx = NULL;
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/* A stack of security contexts. We include the current context as being
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the first one, so there is room for another MAX_SEC_CTX_DEPTH more. */
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struct sec_ctx sec_ctx_stack[MAX_SEC_CTX_DEPTH + 1];
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int sec_ctx_stack_ndx = 0;
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bool become_uid_done = false;
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bool become_gid_done = false;
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connection_struct *last_conn = NULL;
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uint16_t last_flags = 0;
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uint32_t global_client_caps = 0;
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uint16_t fnf_handle = 257;
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/* A stack of current_user connection contexts. */
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struct conn_ctx conn_ctx_stack[MAX_SEC_CTX_DEPTH];
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int conn_ctx_stack_ndx = 0;
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struct vfs_init_function_entry *backends = NULL;
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char *sparse_buf = NULL;
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char *LastDir = NULL;
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struct smbd_parent_context *am_parent = NULL;
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struct memcache *smbd_memcache_ctx = NULL;
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bool exit_firsttime = true;
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struct smbXsrv_connection *global_smbXsrv_connection = NULL;
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struct memcache *smbd_memcache(void)
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{
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if (!smbd_memcache_ctx) {
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/*
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* Note we MUST use the NULL context here, not the
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* autofree context, to avoid side effects in forked
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* children exiting.
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*/
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smbd_memcache_ctx = memcache_init(NULL,
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lp_max_stat_cache_size()*1024);
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}
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if (!smbd_memcache_ctx) {
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smb_panic("Could not init smbd memcache");
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}
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return smbd_memcache_ctx;
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}
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static const struct smbd_shim smbd_shim_fns =
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{
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.cancel_pending_lock_requests_by_fid = smbd_cancel_pending_lock_requests_by_fid,
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.send_stat_cache_delete_message = smbd_send_stat_cache_delete_message,
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.change_to_root_user = smbd_change_to_root_user,
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.contend_level2_oplocks_begin = smbd_contend_level2_oplocks_begin,
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.contend_level2_oplocks_end = smbd_contend_level2_oplocks_end,
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.become_root = smbd_become_root,
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.unbecome_root = smbd_unbecome_root
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};
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void smbd_init_globals(void)
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{
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set_smbd_shim(&smbd_shim_fns);
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ZERO_STRUCT(conn_ctx_stack);
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ZERO_STRUCT(sec_ctx_stack);
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}
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