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The printcap update procedure involves the background printer process obtaining the printcap information from the printing backend, writing this to printer_list.tdb, and then notifying all smbd processes of the new list. The processes then all attempt to simultaneously traverse printer_list.tdb, in order to update their local share lists. With a large number of printers, and a large number of per-client smbd processes, this traversal results in significant lock contention, mostly due to the fact that the traversal is unnecessarily done with an exclusive (write) lock on the printer_list.tdb database. This commit changes the share update code path to perform a read-only traversal. Bug: https://bugzilla.samba.org/show_bug.cgi?id=10652 Reported-by: Alex K <korobkin+samba@gmail.com> Reported-by: Franz Pförtsch <franz.pfoertsch@brose.com> Signed-off-by: David Disseldorp <ddiss@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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Unix SMB/CIFS implementation.
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Share Database of available printers.
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Copyright (C) Simo Sorce 2010
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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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#ifndef _PRINTER_LIST_H_
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#define _PRINTER_LIST_H_
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bool printer_list_parent_init(void);
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/**
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* @brief Get the comment and the last refresh time from the printer list
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* database.
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*
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* @param[in] mem_ctx The talloc memory context to use.
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*
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* @param[in] name The printer name to lookup.
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*
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* @param[out] comment A pointer to store the comment of the printer.
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*
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* @param[out] location A pointer to store the location of the printer.
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*
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* @param[out] last_refresh A pointer to store the last refresh time of the
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* printer.
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*
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* @return NT_STATUS_OK on success, a correspoining NTSTATUS error
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* code on a failure.
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*/
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NTSTATUS printer_list_get_printer(TALLOC_CTX *mem_ctx,
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const char *name,
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const char **comment,
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const char **location,
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time_t *last_refresh);
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/**
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* @brief Add a printer to the printer list database.
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*
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* @param[in] mem_ctx The talloc memory context to use.
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*
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* @param[in] name The printer name to store in the db.
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*
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* @param[in] comment The comment to store in the db.
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*
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* @param[in] location The location to store in the db.
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*
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* @param[in] last_refresh The last refresh time of the printer to store in
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* the db.
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*
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* @return NT_STATUS_OK on success, a correspoining NTSTATUS error
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* code on a failure.
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*/
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NTSTATUS printer_list_set_printer(TALLOC_CTX *mem_ctx,
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const char *name,
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const char *comment,
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const char *location,
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time_t last_refresh);
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/**
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* @brief Get the time of the last refresh of the printer database.
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*
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* @param[out] last_refresh The last refresh time in the db.
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*
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* @return NT_STATUS_OK on success, a correspoining NTSTATUS error
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* code on a failure.
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*/
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NTSTATUS printer_list_get_last_refresh(time_t *last_refresh);
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/**
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* @brief Mark the database as reloaded.
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*
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* This sets the last refresh time to the current time. You can get the last
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* reload/refresh time of the database with printer_list_get_last_refresh().
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*
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* @return NT_STATUS_OK on success, a correspoining NTSTATUS error
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* code on a failure.
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*/
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NTSTATUS printer_list_mark_reload(void);
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/**
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* @brief Cleanup old entries in the database.
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*
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* Entries older than the last refresh times will be deleted.
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*
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* @return NT_STATUS_OK on success, a correspoining NTSTATUS error
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* code on a failure.
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*/
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NTSTATUS printer_list_clean_old(void);
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NTSTATUS printer_list_read_run_fn(void (*fn)(const char *, const char *, const char *, void *),
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void *private_data);
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#endif /* _PRINTER_LIST_H_ */
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