Date: Mon, 23 Feb 2015 21:59:30 +0000 (UTC) From: "Kenneth D. Merry" <ken@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r279219 - in head: contrib/groff/tmac lib lib/libmt rescue/rescue share/man/man4 share/mk sys/cam/scsi sys/sys usr.bin/mt Message-ID: <201502232159.t1NLxUZr068017@svn.freebsd.org>
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Author: ken Date: Mon Feb 23 21:59:30 2015 New Revision: 279219 URL: https://svnweb.freebsd.org/changeset/base/279219 Log: Significant upgrades to sa(4) and mt(1). The primary focus of these changes is to modernize FreeBSD's tape infrastructure so that we can take advantage of some of the features of modern tape drives and allow support for LTFS. Significant changes and new features include: o sa(4) driver status and parameter information is now exported via an XML structure. This will allow for changes and improvements later on that will not break userland applications. The old MTIOCGET status ioctl remains, so applications using the existing interface will not break. o 'mt status' now reports drive-reported tape position information as well as the previously available calculated tape position information. These numbers will be different at times, because the drive-reported block numbers are relative to BOP (Beginning of Partition), but the block numbers calculated previously via sa(4) (and still provided) are relative to the last filemark. Both numbers are now provided. 'mt status' now also shows the drive INQUIRY information, serial number and any position flags (BOP, EOT, etc.) provided with the tape position information. 'mt status -v' adds information on the maximum possible I/O size, and the underlying values used to calculate it. o The extra sa(4) /dev entries (/dev/saN.[0-3]) have been removed. The extra devices were originally added as place holders for density-specific device nodes. Some OSes (NetBSD, NetApp's OnTap and Solaris) have had device nodes that, when you write to them, will automatically select a given density for particular tape drives. This is a convenient way of switching densities, but it was never implemented in FreeBSD. Only the device nodes were there, and that sometimes confused users. For modern tape devices, the density is generally not selectable (e.g. with LTO) or defaults to the highest availble density when the tape is rewritten from BOT (e.g. TS11X0). So, for most users, density selection won't be necessary. If they do need to select the density, it is easy enough to use 'mt density' to change it. o Protection information is now supported. This is either a Reed-Solomon CRC or CRC32 that is included at the end of each block read and written. On write, the tape drive verifies the CRC, and on read, the tape drive provides a CRC for the userland application to verify. o New, extensible tape driver parameter get/set interface. o Density reporting information. For drives that support it, 'mt getdensity' will show detailed information on what formats the tape drive supports, and what formats the tape drive supports. o Some mt(1) functionality moved into a new mt(3) library so that external applications can reuse the code. o The new mt(3) library includes helper routines to aid in parsing the XML output of the sa(4) driver, and build a tree of driver metadata. o Support for the MTLOAD (load a tape in the drive) and MTWEOFI (write filemark immediate) ioctls needed by IBM's LTFS implementation. o Improve device departure behavior for the sa(4) driver. The previous implementation led to hangs when the device was open. o This has been tested on the following types of drives: IBM TS1150 IBM TS1140 IBM LTO-6 IBM LTO-5 HP LTO-2 Seagate DDS-4 Quantum DLT-4000 Exabyte 8505 Sony DDS-2 contrib/groff/tmac/doc-syms, share/mk/bsd.libnames.mk, lib/Makefile, Add libmt. lib/libmt/Makefile, lib/libmt/mt.3, lib/libmt/mtlib.c, lib/libmt/mtlib.h, New mt(3) library that contains functions moved from mt(1) and new functions needed to interact with the updated sa(4) driver. This includes XML parser helper functions that application writers can use when writing code to query tape parameters. rescue/rescue/Makefile: Add -lmt to CRUNCH_LIBS. src/share/man/man4/mtio.4 Clarify this man page a bit, and since it contains what is essentially the mtio.h header file, add new ioctls and structure definitions from mtio.h. src/share/man/man4/sa.4 Update BUGS and maintainer section. sys/cam/scsi/scsi_all.c, sys/cam/scsi/scsi_all.h: Add SCSI SECURITY PROTOCOL IN/OUT CDB definitions and CDB building functions. sys/cam/scsi/scsi_sa.c sys/cam/scsi/scsi_sa.h Many tape driver changes, largely outlined above. Increase the sa(4) driver read/write timeout from 4 to 32 minutes. This is based on the recommended values for IBM LTO 5/6 drives. This may also avoid timeouts for other tape hardware that can take a long time to do retries and error recovery. Longer term, a better way to handle this is to ask the drive for recommended timeout values using the REPORT SUPPORTED OPCODES command. Modern IBM and Oracle tape drives at least support that command, and it would allow for more accurate timeout values. Add XML status generation. This is done with a series of macros to eliminate as much duplicate code as possible. The new XML-based status values are reported through the new MTIOCEXTGET ioctl. Add XML driver parameter reporting, using the new MTIOCPARAMGET ioctl. Add a new driver parameter setting interface, using the new MTIOCPARAMSET and MTIOCSETLIST ioctls. Add a new MTIOCRBLIM ioctl to get block limits information. Add CCB/CDB building routines scsi_locate_16, scsi_locate_10, and scsi_read_position_10(). scsi_locate_10 implements the LOCATE command, as does the existing scsi_set_position() command. It just supports additional arguments and features. If/when we figure out a good way to provide backward compatibility for older applications using the old function API, we can just revamp scsi_set_position(). The same goes for scsi_read_position_10() and the existing scsi_read_position() function. Revamp sasetpos() to take the new mtlocate structure as an argument. It now will use either scsi_locate_10() or scsi_locate_16(), depending upon the arguments the user supplies. As before, once we change position we don't have a clear idea of what the current logical position of the tape drive is. For tape drives that support long form position data, we read the current position and store that for later reporting after changing the position. This should help applications like Bacula speed tape access under FreeBSD once they are modified to support the new ioctls. Add a new quirk, SA_QUIRK_NO_LONG_POS, that is set for all drives that report SCSI-2 or older, as well as drives that report an Illegal Request type error for READ POSITION with the long format. So we should automatically detect drives that don't support the long form and stop asking for it after an initial try. Add a partition number to the sa(4) softc. Improve device departure handling. The previous implementation led to hangs when the device was open. If an application had the sa(4) driver open, and attempted to close it after it went away, the cam_periph_release() call in saclose() would cause the periph to get destroyed because that was the last reference to it. Because destroy_dev() was called from the sa(4) driver's cleanup routine (sacleanup()), and would block waiting for the close to happen, a deadlock would result. So instead of calling destroy_dev() from the cleanup routine, call destroy_dev_sched_cb() from saoninvalidate() and wait for the callback. Acquire a reference for devfs in saregister(), and release it in the new sadevgonecb() routine when all devfs devices for the particular sa(4) driver instance are gone. Add a new function, sasetupdev(), to centralize setting per-instance devfs device parameters instead of repeating the code in saregister(). Add an open count to the softc, so we know how many peripheral driver references are a result of open sessions. Add the D_TRACKCLOSE flag to the cdevsw flags so that we get a 1:1 mapping of open to close calls instead of a N:1 mapping. This should be a no-op for everything except the control device, since we don't allow more than one open on non-control devices. However, since we do allow multiple opens on the control device, the combination of the open count and the D_TRACKCLOSE flag should result in an accurate peripheral driver reference count, and an accurate open count. The accurate open count allows us to release all peripheral driver references that are the result of open contexts once we get the callback from devfs. sys/sys/mtio.h: Add a number of new mt(4) ioctls and the requisite data structures. None of the existing interfaces been removed or changed. This includes definitions for the following new ioctls: MTIOCRBLIM /* get block limits */ MTIOCEXTLOCATE /* seek to position */ MTIOCEXTGET /* get tape status */ MTIOCPARAMGET /* get tape params */ MTIOCPARAMSET /* set tape params */ MTIOCSETLIST /* set N params */ usr.bin/mt/Makefile: mt(1) now depends on libmt, libsbuf and libbsdxml. usr.bin/mt/mt.1: Document new mt(1) features and subcommands. usr.bin/mt/mt.c: Implement support for mt(1) subcommands that need to use getopt(3) for their arguments. Implement a new 'mt status' command to replace the old 'mt status' command. The old status command has been renamed 'ostatus'. The new status function uses the MTIOCEXTGET ioctl, and therefore parses the XML data to determine drive status. The -x argument to 'mt status' allows the user to dump out the raw XML reported by the kernel. The new status display is mostly the same as the old status display, except that it doesn't print the redundant density mode information, and it does print the current partition number and position flags. Add a new command, 'mt locate', that will supersede the old 'mt setspos' and 'mt sethpos' commands. 'mt locate' implements all of the functionality of the MTIOCEXTLOCATE ioctl, and allows the user to change the logical position of the tape drive in a number of ways. (Partition, block number, file number, set mark number, end of data.) The immediate bit and the explicit address bits are implemented, but not documented in the man page. Add a new 'mt weofi' command to use the new MTWEOFI ioctl. This allows the user to ask the drive to write a filemark without waiting around for the operation to complete. Add a new 'mt getdensity' command that gets the XML-based tape drive density report from the sa(4) driver and displays it. This uses the SCSI REPORT DENSITY SUPPORT command to get comprehensive information from the tape drive about what formats it is able to read and write. Add a new 'mt protect' command that allows getting and setting tape drive protection information. The protection information is a CRC tacked on to the end of every read/write from and to the tape drive. Sponsored by: Spectra Logic MFC after: 1 month Added: head/lib/libmt/ head/lib/libmt/Makefile (contents, props changed) head/lib/libmt/mt.3 (contents, props changed) head/lib/libmt/mtlib.c (contents, props changed) head/lib/libmt/mtlib.h (contents, props changed) Modified: head/contrib/groff/tmac/doc-syms head/lib/Makefile head/rescue/rescue/Makefile head/share/man/man4/mtio.4 head/share/man/man4/sa.4 head/share/mk/bsd.libnames.mk head/sys/cam/scsi/scsi_all.c head/sys/cam/scsi/scsi_all.h head/sys/cam/scsi/scsi_sa.c head/sys/cam/scsi/scsi_sa.h head/sys/sys/mtio.h head/usr.bin/mt/Makefile head/usr.bin/mt/mt.1 head/usr.bin/mt/mt.c Modified: head/contrib/groff/tmac/doc-syms ============================================================================== --- head/contrib/groff/tmac/doc-syms Mon Feb 23 21:16:02 2015 (r279218) +++ head/contrib/groff/tmac/doc-syms Mon Feb 23 21:59:30 2015 (r279219) @@ -796,6 +796,7 @@ .ds doc-str-Lb-libmd Message Digest (MD4, MD5, etc.) Support Library (libmd, \-lmd) .ds doc-str-Lb-libmemstat Kernel Memory Allocator Statistics Library (libmemstat, \-lmemstat) .ds doc-str-Lb-libmenu Curses Menu Library (libmenu, \-lmenu) +.ds doc-str-Lb-libmt Magnetic Tape Library (libmt, \-lmt) .ds doc-str-Lb-libnetgraph Netgraph User Library (libnetgraph, \-lnetgraph) .ds doc-str-Lb-libnetpgp Netpgp signing, verification, encryption and decryption (libnetpgp, \-lnetpgp) .ds doc-str-Lb-libossaudio OSS Audio Emulation Library (libossaudio, \-lossaudio) Modified: head/lib/Makefile ============================================================================== --- head/lib/Makefile Mon Feb 23 21:16:02 2015 (r279218) +++ head/lib/Makefile Mon Feb 23 21:59:30 2015 (r279219) @@ -70,6 +70,7 @@ SUBDIR= ${SUBDIR_ORDERED} \ libmd \ ${_libmilter} \ ${_libmp} \ + libmt \ ${_libnandfs} \ libnetbsd \ ${_libnetgraph} \ Added: head/lib/libmt/Makefile ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libmt/Makefile Mon Feb 23 21:59:30 2015 (r279219) @@ -0,0 +1,13 @@ +# $FreeBSD$ + +LIB= mt +SHLIBDIR?= /lib +SRCS= mtlib.c +INCS= mtlib.h + +DPADD= ${LIBSBUF} +LDADD= -lsbuf + +MAN= mt.3 + +.include <bsd.lib.mk> Added: head/lib/libmt/mt.3 ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libmt/mt.3 Mon Feb 23 21:59:30 2015 (r279219) @@ -0,0 +1,455 @@ +.\" +.\" Copyright (c) 2013, 2015 Spectra Logic Corporation +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions, and the following disclaimer, +.\" without modification. +.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer +.\" substantially similar to the "NO WARRANTY" disclaimer below +.\" ("Disclaimer") and any redistribution must be conditioned upon +.\" including a substantially similar Disclaimer requirement for further +.\" binary redistribution. +.\" +.\" NO WARRANTY +.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR +.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +.\" HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING +.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +.\" POSSIBILITY OF SUCH DAMAGES. +.\" +.\" Authors: Ken Merry (Spectra Logic Corporation) +.\" +.\" $FreeBSD$ +.\" +.Dd February 13, 2015 +.Dt MT 3 +.Os +.Sh NAME +.Nm +.Nm mt_start_element , +.Nm mt_end_element , +.Nm mt_char_handler , +.Nm mt_status_tree_sbuf , +.Nm mt_status_tree_print , +.Nm mt_status_entry_free , +.Nm mt_status_free , +.Nm mt_entry_sbuf , +.Nm mt_param_parent_print , +.Nm mt_param_entry_print , +.Nm mt_protect_print , +.Nm mt_param_list , +.Nm mt_density_name , +.Nm mt_density_bp , +.Nm mt_density_num , +.Nm mt_get_xml_str , +.Nm mt_get_status +.Nd Magnetic Tape library +.Sh LIBRARY +.Lb libmt +.Sh SYNOPSIS +.In sys/sbuf.h +.In bsdxml.h +.In mtlib.h +.Ft void +.Fo mt_start_element +.Fa "void *user_data" +.Fa "const char *name" +.Fa "const char **attr" +.Fc +.Ft void +.Fo mt_end_element +.Fa "void *user_data" +.Fa "const char *name" +.Fc +.Ft void +.Fo mt_char_handler +.Fa "void *user_data" +.Fa "const XML_Char *str" +.Fa "int len" +.Fc +.Ft void +.Fo mt_status_tree_sbuf +.Fa "struct sbuf *sb" +.Fa "struct mt_status_entry *entry" +.Fa "int indent" +.Fa "void (*sbuf_func)(struct sbuf *sb, struct mt_status_entry *entry, void *arg)" +.Fa "void *arg" +.Fc +.Ft void +.Fo mt_status_tree_print +.Fa "struct mt_status_entry *entry" +.Fa "int indent" +.Fa "void (*print_func)(struct mt_status_entry *entry, void *arg)" +.Fa "void *arg" +.Fc +.Ft "struct mt_status_entry *" +.Fo mt_entry_find +.Fa "struct mt_status_entry *entry" +.Fa "char *name" +.Fc +.Ft "struct mt_status_entry *" +.Fo mt_status_entry_find +.Fa "struct mt_status_data *status_data" +.Fa "char *name" +.Fc +.Ft void +.Fo mt_status_entry_free +.Fa "struct mt_status_entry *entry)" +.Fc +.Ft void +.Fo mt_status_free +.Fa "struct mt_status_data *status_data" +.Fc +.Ft void +.Fo mt_entry_sbuf +.Fa "struct sbuf *sb" +.Fa "struct mt_status_entry *entry" +.Fa "char *fmt" +.Fc +.Ft void +.Fo mt_param_parent_sbuf +.Fa "struct sbuf *sb" +.Fa "struct mt_status_entry *entry" +.Fa "struct mt_print_params *print_params" +.Fc +.Ft void +.Fo mt_param_parent_print +.Fa "struct mt_status_entry *entry" +.Fa "struct mt_print_params *print_params" +.Fc +.Ft void +.Fo mt_param_entry_sbuf +.Fa "struct sbuf *sb" +.Fa "struct mt_status_entry *entry" +.Fa "void *arg" +.Fc +.Ft void +.Fo mt_param_entry_print +.Fa "struct mt_status_entry *entry" +.Fa "void *arg" +.Fc +.Ft int +.Fo mt_protect_print +.Fa "struct mt_status_data *status_data" +.Fa "int verbose" +.Fc +.Ft int +.Fo mt_param_list +.Fa "struct mt_status_data *status_data" +.Fa "char *param_name" +.Fa "int quiet" +.Fc +.Ft "const char *" +.Fo mt_density_name +.Fa "int density_num" +.Fc +.Ft int +.Fo mt_density_bp +.Fa "int density_num" +.Fa "int bpi" +.Fc +.Ft int +.Fo mt_density_num +.Fa "const char *density_name" +.Fc +.Ft int +.Fo mt_get_status +.Fa "char *xml_str" +.Fa "struct mt_status_data *status_data" +.Fc +.Sh DESCRIPTION +The MT library consists of a number of functions designed to aid in +interacting with the +.Xr sa 4 +driver. +The +.Xr sa 4 +driver returns some status data as XML-formatted strings, and +the primary purpose of this library is to make it easier for the +software developer to parse those strings and extract the status values. +.Pp +The +.Fn mt_start_element , +.Fn mt_end_element , +and +.Fn mt_char_handler +functions are designed to work with the +.Xr libbbsdxml 3 +library, which is an XML parsing library. +The user data for the XML parser should be set with +.Fn XML_SetUserData +to a zeroed struct +mt_status_data with the entries list initialized. +The element handlers for the XML parser should be set to +.Fn mt_start_element +and +.Fn mt_end_element +with +.Fn XML_SetElementHandler . +The character data handler should be set to +.Fn mt_char_handler +with the +.Fn XML_SetCharacterDataHandler +function. +The error member of the status_data structure will be set to 0 if parsing +is successful, and non-zero if parsing failed. +In the event of a failure, the error_str member will contain an error +message describing the failure. +These functions will build a tree of tape driver status data that can be +searched and printed using the other functions in this library. +.Pp +.Fn mt_status_tree_sbuf +takes the root node of a tree of +.Xr sa 4 +driver status information, and displays it in an +.Xr sbuf 9 . +The +.Ar sb +argument is the destination sbuf. +The +.Ar entry +argument is the root of the tree. +The +.Ar indent +argument is the number of characters to indent the output. +Each recursive call to +.Fn mt_status_tree_sbuf +will have the indent level incremented by 2. +The +.Ar sbuf_func +argument is for a user-supplied alternate printing function. +If it is non-NULL, it will be called instead of the default output printing +code. +The +.Ar arg +argument is an argument for the +.Ar sbuf_func +function. +.Pp +The +.Fn mt_status_tree_print +function is the same as the +.Fn mt_status_tree_sbuf +function, except that the tree is printed to standard out instead of to a +sbuf. +.Pp +The +.Fn mt_entry_find +function returns the first entry in the tree starting at +.Ar entry +that matches +.Ar name . +The supplied node name can be a single level name like "foo", or it can +specify mulitple node names that must be matched, for instance "foo.bar.baz". +In the case of a single level name, it will match any node beneath +.Ar entry +that matches +.Ar name . +In the case of a multi-level name like "foo.bar.baz", it will return the +first entry named "baz" whose immediate parent is "bar" and where the +parent of "bar" is named "foo". +.Pp +The +.Fn mt_status_entry_find +is the same as +.Fn mt_entry_find , +except that it operates on the top level mt_status_data and all +mt_status_entry nodes below it instead of just an mt_status_entry +structure. +.Pp +The +.Fn mt_status_entry_free +function frees the tree of status data underneath +.Ar entry . +.Pp +The +.Fn mt_status_free +function frees the tree of status data underneath +.Ar status_data . +.Pp +The +.Fn mt_entry_sbuf +function prints +.Ar entry +to the supplied sbuf +.Ar sb , +optionally using the +.Xr printf 3 +format +.Ar fmt . +If +.Ar fmt +is NULL, then +.Fn mt_entry_sbuf +will render integer types in base 10 without special formatting and all +other types as they were rendered in the XML. +.Pp +.Fn mt_param_parent_sbuf +prints the parents of the given +.Ar entry +to the supplied sbuf +.Ar sb +subject to the print parameters +.Ar print_params . +The result will be formatted with a period between each level, like +"foo.bar.baz". +.Pp +.Fn mt_param_parent_print +is like +.Fn mt_param_parent_sbuf +except that it prints the results to standard output instead of an sbuf. +.Pp +.Fn mt_param_entry_sbuf +prints the +.Ar entry +to the given sbuf +.Ar sb . +The argument +.Ar arg +is a pointer to struct mt_print_params, which allows the caller to control +the printing output. +This function is intended to be supplied as an argument to +.Fn mt_status_tree_sbuf . +.Pp +.Fn mt_param_entry_print +is like +.Fn mt_param_entry_sbuf +except that it prints to standard output instead of an sbuf. +It is intended to be used as an argument to +.Fn mt_status_tree_print . +.Pp +.Fn mt_protect_print +prints tape drive protection information from the supplied +.Ar status_data +beginning at the node name defined as the root node for protection data. +If the +.Ar verbose +argument is non-zero, protection entry descriptions will be printed. +If it is zero, protection entry descriptions will not be printed. +.Pp +.Fn mt_param_list +prints tape driver parameters information from the supplied +.Ar status_data . +If the +.Ar param_name +is non-NULL, only the named parameter will be printed. +If +.Ar quiet +is non-zero, parameter descriptions will be omitted in the output. +.Pp +.Fn mt_density_name +Returns a text identifier for the supplied numeric +.Ar density_num . +The +.Ar density_num +should currently be a value between 0 and 255 inclusive, since that is the +valid range for +.Tn SCSI +density code values. +See below for notes on the return values. +.Pp +.Fn mt_density_bp +Returns the bits per inch or bits per mm values for a given density entry +specified by the +.Ar density_num . +If the +.Ar bpi +argument is non-zero, the bits per inch value is returned. +Otherwise, the bits per mm value is returned. +.Pp +.Fn mt_density_num +returns a numeric value for a text density description. +It does a case-insensitive comparison of density names in the density table +to the supplied density name. +.Pp +.Fn mt_get_xml_str +gets the current XML status / parameter string from the sa(4) driver +instance referenced by the open file descriptor +.Ar mtfd . +The +.Xr mtio 4 +.Xr ioctl 2 +to be used is supplied as the +.Ar cmd +argument. +Currently the +.Fn mt_get_xml_str +function will work with the +.Dv MTIOCEXTGET +and +.Dv MTIOCPARAMGET +ioctls. +The supplied +.Ar xml_str +will be filled in with a pointer to the complete XML status string. +Multiple calls to the given +.Xr ioctl 2 +are made and more space is malloced until all of the XML string is fetched. +The string returned in the +.Ar xml_str +argument should be freed when it is no longer in use. +.Sh RETURN VALUES +.Fn mt_entry_find +returns the first matching entry, or NULL if it fails to find a match. +.Pp +.Fn mt_status_entry_find +returns the first matching entry, or NULL if it fails to find a match. +.Pp +.Fn mt_protect_print +Returns 0 for success, and non-zero for failure. +.Fn mt_protect_print +can only fail if it cannot find protection information in the supplied +status data. +.Pp +.Fn mt_param_list +Returns 0 for success and non-zero for failure. +.Fn mt_param_list +can only fail if it cannot find parameter information in the supplied +status data. +.Pp +.Fn mt_density_name +returns a text description of a numeric density. +The special density value 0 is decoded as "default". +The special density value 0x7f is decoded as "same". +If the density is not known, +.Fn mt_density_name +will return "UNKNOWN". +.Pp +.Fn mt_density_bp +returns the bits per inch value for the given density (if the +.Ar bpi +field is non-zero), the bits per mm value otherwise, or 0 if the supplied +.Ar density_num +is not in the density table or the table entry does not include bpi / bpmm +values. +.Pp +.Fn mt_density_num +returns a numeric density value between 0 and 255 for the supplied density +name. +It returns 0 if the density name is not recognized. +.Pp +.Fn mt_get_xml_str +returns 0 for success, and -1 for failure. +.Sh SEE ALSO +.Xr mt 1 , +.Xr mtio 4 , +.Xr sa 4 +.Sh HISTORY +The MT library first appeared in +.Fx 10.1 . +.Sh AUTHORS +.An Ken Merry Aq ken@FreeBSD.org +.Sh BUGS +The library interface is not complete, and may change in the future. +Application authors should not rely on the library interface to be +consistent in the immediate future. Added: head/lib/libmt/mtlib.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/lib/libmt/mtlib.c Mon Feb 23 21:59:30 2015 (r279219) @@ -0,0 +1,756 @@ +/*- + * Copyright (c) 2013, 2014, 2015 Spectra Logic Corporation + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + * Authors: Ken Merry (Spectra Logic Corporation) + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/mtio.h> +#include <sys/queue.h> +#include <sys/sbuf.h> + +#include <ctype.h> +#include <err.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <stdint.h> +#include <errno.h> +#include <bsdxml.h> +#include <mtlib.h> + +/* + * Called at the start of each XML element, and includes the list of + * attributes for the element. + */ +void +mt_start_element(void *user_data, const char *name, const char **attr) +{ + int i; + struct mt_status_data *mtinfo; + struct mt_status_entry *entry; + + mtinfo = (struct mt_status_data *)user_data; + + if (mtinfo->error != 0) + return; + + mtinfo->level++; + if ((u_int)mtinfo->level > (sizeof(mtinfo->cur_sb) / + sizeof(mtinfo->cur_sb[0]))) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, sizeof(mtinfo->error_str), + "%s: too many nesting levels, %zd max", __func__, + sizeof(mtinfo->cur_sb) / sizeof(mtinfo->cur_sb[0])); + return; + } + + mtinfo->cur_sb[mtinfo->level] = sbuf_new_auto(); + if (mtinfo->cur_sb[mtinfo->level] == NULL) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, sizeof(mtinfo->error_str), + "%s: Unable to allocate sbuf", __func__); + return; + } + + entry = malloc(sizeof(*entry)); + if (entry == NULL) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, sizeof(mtinfo->error_str), + "%s: unable to allocate %zd bytes", __func__, + sizeof(*entry)); + return; + } + bzero(entry, sizeof(*entry)); + STAILQ_INIT(&entry->nv_list); + STAILQ_INIT(&entry->child_entries); + entry->entry_name = strdup(name); + mtinfo->cur_entry[mtinfo->level] = entry; + if (mtinfo->cur_entry[mtinfo->level - 1] == NULL) { + STAILQ_INSERT_TAIL(&mtinfo->entries, entry, links); + } else { + STAILQ_INSERT_TAIL( + &mtinfo->cur_entry[mtinfo->level - 1]->child_entries, + entry, links); + entry->parent = mtinfo->cur_entry[mtinfo->level - 1]; + } + for (i = 0; attr[i] != NULL; i+=2) { + struct mt_status_nv *nv; + int need_nv; + + need_nv = 0; + + if (strcmp(attr[i], "size") == 0) { + entry->size = strtoull(attr[i+1], NULL, 0); + } else if (strcmp(attr[i], "type") == 0) { + if (strcmp(attr[i+1], "int") == 0) { + entry->var_type = MT_TYPE_INT; + } else if (strcmp(attr[i+1], "uint") == 0) { + entry->var_type = MT_TYPE_UINT; + } else if (strcmp(attr[i+1], "str") == 0) { + entry->var_type = MT_TYPE_STRING; + } else if (strcmp(attr[i+1], "node") == 0) { + entry->var_type = MT_TYPE_NODE; + } else { + need_nv = 1; + } + } else if (strcmp(attr[i], "fmt") == 0) { + entry->fmt = strdup(attr[i+1]); + } else if (strcmp(attr[i], "desc") == 0) { + entry->desc = strdup(attr[i+1]); + } else { + need_nv = 1; + } + if (need_nv != 0) { + nv = malloc(sizeof(*nv)); + if (nv == NULL) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, + sizeof(mtinfo->error_str), + "%s: error allocating %zd bytes", + __func__, sizeof(*nv)); + } + bzero(nv, sizeof(*nv)); + nv->name = strdup(attr[i]); + nv->value = strdup(attr[i+1]); + STAILQ_INSERT_TAIL(&entry->nv_list, nv, links); + } + } +} + +/* + * Called on XML element close. + */ +void +mt_end_element(void *user_data, const char *name) +{ + struct mt_status_data *mtinfo; + char *str; + + mtinfo = (struct mt_status_data *)user_data; + + if (mtinfo->error != 0) + return; + + if (mtinfo->cur_sb[mtinfo->level] == NULL) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, sizeof(mtinfo->error_str), + "%s: no valid sbuf at level %d (name %s)", __func__, + mtinfo->level, name); + return; + } + sbuf_finish(mtinfo->cur_sb[mtinfo->level]); + str = strdup(sbuf_data(mtinfo->cur_sb[mtinfo->level])); + if (str == NULL) { + mtinfo->error = 1; + snprintf(mtinfo->error_str, sizeof(mtinfo->error_str), + "%s can't allocate %zd bytes for string", __func__, + sbuf_len(mtinfo->cur_sb[mtinfo->level])); + return; + } + + if (strlen(str) == 0) { + free(str); + str = NULL; + } + if (str != NULL) { + struct mt_status_entry *entry; + + entry = mtinfo->cur_entry[mtinfo->level]; + switch(entry->var_type) { + case MT_TYPE_INT: + entry->value_signed = strtoll(str, NULL, 0); + break; + case MT_TYPE_UINT: + entry->value_unsigned = strtoull(str, NULL, 0); + break; + default: + break; + } + } + + mtinfo->cur_entry[mtinfo->level]->value = str; + + sbuf_delete(mtinfo->cur_sb[mtinfo->level]); + mtinfo->cur_sb[mtinfo->level] = NULL; + mtinfo->cur_entry[mtinfo->level] = NULL; + mtinfo->level--; +} + +/* + * Called to handle character strings in the current element. + */ +void +mt_char_handler(void *user_data, const XML_Char *str, int len) +{ + struct mt_status_data *mtinfo; + + mtinfo = (struct mt_status_data *)user_data; + if (mtinfo->error != 0) + return; + + sbuf_bcat(mtinfo->cur_sb[mtinfo->level], str, len); +} + +void +mt_status_tree_sbuf(struct sbuf *sb, struct mt_status_entry *entry, int indent, + void (*sbuf_func)(struct sbuf *sb, struct mt_status_entry *entry, + void *arg), void *arg) +{ + struct mt_status_nv *nv; + struct mt_status_entry *entry2; + + if (sbuf_func != NULL) { + sbuf_func(sb, entry, arg); + } else { + sbuf_printf(sb, "%*sname: %s, value: %s, fmt: %s, size: %zd, " + "type: %d, desc: %s\n", indent, "", entry->entry_name, + entry->value, entry->fmt, entry->size, entry->var_type, + entry->desc); + STAILQ_FOREACH(nv, &entry->nv_list, links) { + sbuf_printf(sb, "%*snv: name: %s, value: %s\n", + indent + 1, "", nv->name, nv->value); + } + } + + STAILQ_FOREACH(entry2, &entry->child_entries, links) + mt_status_tree_sbuf(sb, entry2, indent + 2, sbuf_func, arg); +} + +void +mt_status_tree_print(struct mt_status_entry *entry, int indent, + void (*print_func)(struct mt_status_entry *entry, void *arg), void *arg) +{ + + if (print_func != NULL) { + struct mt_status_entry *entry2; + + print_func(entry, arg); + STAILQ_FOREACH(entry2, &entry->child_entries, links) + mt_status_tree_print(entry2, indent + 2, print_func, + arg); + } else { + struct sbuf *sb; + + sb = sbuf_new_auto(); + if (sb == NULL) + return; + mt_status_tree_sbuf(sb, entry, indent, NULL, NULL); + sbuf_finish(sb); + + printf("%s", sbuf_data(sb)); + sbuf_delete(sb); + } +} + +/* + * Given a parameter name in the form "foo" or "foo.bar.baz", traverse the + * tree looking for the parameter (the first case) or series of parameters + * (second case). + */ +struct mt_status_entry * +mt_entry_find(struct mt_status_entry *entry, char *name) +{ + struct mt_status_entry *entry2; + char *tmpname = NULL, *tmpname2 = NULL, *tmpstr = NULL; + + tmpname = strdup(name); + if (tmpname == NULL) + goto bailout; + + /* Save a pointer so we can free this later */ + tmpname2 = tmpname; + + tmpstr = strsep(&tmpname, "."); + + /* + * Is this the entry we're looking for? Or do we have further + * child entries that we need to grab? + */ + if (strcmp(entry->entry_name, tmpstr) == 0) { + if (tmpname == NULL) { + /* + * There are no further child entries to find. We + * have a complete match. + */ + free(tmpname2); + return (entry); + } else { + /* + * There are more child entries that we need to find. + * Fall through to the recursive search off of this + * entry, below. Use tmpname, which will contain + * everything after the first period. + */ + name = tmpname; + } + } + + /* + * Recursively look for further entries. + */ + STAILQ_FOREACH(entry2, &entry->child_entries, links) { + struct mt_status_entry *entry3; + + entry3 = mt_entry_find(entry2, name); + if (entry3 != NULL) { + free(tmpname2); + return (entry3); + } + } + +bailout: + free(tmpname2); + + return (NULL); +} + +struct mt_status_entry * +mt_status_entry_find(struct mt_status_data *status_data, char *name) +{ + struct mt_status_entry *entry, *entry2; + + STAILQ_FOREACH(entry, &status_data->entries, links) { + entry2 = mt_entry_find(entry, name); + if (entry2 != NULL) + return (entry2); + } + + return (NULL); +} + +void +mt_status_entry_free(struct mt_status_entry *entry) +{ + struct mt_status_entry *entry2, *entry3; + struct mt_status_nv *nv, *nv2; + + STAILQ_FOREACH_SAFE(entry2, &entry->child_entries, links, entry3) { + STAILQ_REMOVE(&entry->child_entries, entry2, mt_status_entry, + links); + mt_status_entry_free(entry2); + } + + free(entry->entry_name); + free(entry->value); + free(entry->fmt); + free(entry->desc); + + STAILQ_FOREACH_SAFE(nv, &entry->nv_list, links, nv2) { + STAILQ_REMOVE(&entry->nv_list, nv, mt_status_nv, links); + free(nv->name); + free(nv->value); + free(nv); + } + free(entry); +} + +void +mt_status_free(struct mt_status_data *status_data) +{ + struct mt_status_entry *entry, *entry2; + + STAILQ_FOREACH_SAFE(entry, &status_data->entries, links, entry2) { + STAILQ_REMOVE(&status_data->entries, entry, mt_status_entry, + links); + mt_status_entry_free(entry); + } +} + +void +mt_entry_sbuf(struct sbuf *sb, struct mt_status_entry *entry, char *fmt) +{ + switch(entry->var_type) { + case MT_TYPE_INT: + if (fmt != NULL) + sbuf_printf(sb, fmt, (intmax_t)entry->value_signed); + else + sbuf_printf(sb, "%jd", + (intmax_t)entry->value_signed); + break; + case MT_TYPE_UINT: + if (fmt != NULL) + sbuf_printf(sb, fmt, (uintmax_t)entry->value_unsigned); + else + sbuf_printf(sb, "%ju", + (uintmax_t)entry->value_unsigned); + break; + default: + if (fmt != NULL) + sbuf_printf(sb, fmt, entry->value); + else + sbuf_printf(sb, "%s", entry->value); + break; + } +} + +void +mt_param_parent_print(struct mt_status_entry *entry, + struct mt_print_params *print_params) +{ + if (entry->parent != NULL) + mt_param_parent_print(entry->parent, print_params); + + if (((print_params->flags & MT_PF_INCLUDE_ROOT) == 0) + && (strcmp(entry->entry_name, print_params->root_name) == 0)) + return; + + printf("%s.", entry->entry_name); +} + +void +mt_param_parent_sbuf(struct sbuf *sb, struct mt_status_entry *entry, + struct mt_print_params *print_params) +{ + if (entry->parent != NULL) + mt_param_parent_sbuf(sb, entry->parent, print_params); + + if (((print_params->flags & MT_PF_INCLUDE_ROOT) == 0) + && (strcmp(entry->entry_name, print_params->root_name) == 0)) + return; + + sbuf_printf(sb, "%s.", entry->entry_name); +} + +void +mt_param_entry_sbuf(struct sbuf *sb, struct mt_status_entry *entry, void *arg) +{ + struct mt_print_params *print_params; + + print_params = (struct mt_print_params *)arg; + + /* + * We don't want to print nodes. + */ + if (entry->var_type == MT_TYPE_NODE) + return; + + if ((print_params->flags & MT_PF_FULL_PATH) + && (entry->parent != NULL)) + mt_param_parent_sbuf(sb, entry->parent, print_params); + + sbuf_printf(sb, "%s: %s", entry->entry_name, entry->value); + if ((print_params->flags & MT_PF_VERBOSE) + && (entry->desc != NULL) + && (strlen(entry->desc) > 0)) + sbuf_printf(sb, " (%s)", entry->desc); + sbuf_printf(sb, "\n"); + +} + +void +mt_param_entry_print(struct mt_status_entry *entry, void *arg) +{ + struct mt_print_params *print_params; + + print_params = (struct mt_print_params *)arg; + + /* + * We don't want to print nodes. + */ + if (entry->var_type == MT_TYPE_NODE) + return; + + if ((print_params->flags & MT_PF_FULL_PATH) + && (entry->parent != NULL)) + mt_param_parent_print(entry->parent, print_params); + + printf("%s: %s", entry->entry_name, entry->value); + if ((print_params->flags & MT_PF_VERBOSE) + && (entry->desc != NULL) + && (strlen(entry->desc) > 0)) + printf(" (%s)", entry->desc); + printf("\n"); +} + +int +mt_protect_print(struct mt_status_data *status_data, int verbose) +{ + struct mt_status_entry *entry; + const char *prot_name = MT_PROTECTION_NAME; + struct mt_print_params print_params; *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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