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Cleaned up scsi sibling management, sketched grafting of DDLP

This commit is contained in:
Thomas Schmitt 2007-04-09 10:54:17 +00:00
parent 1a054b54c9
commit 4bc8e4caea
5 changed files with 74 additions and 47 deletions
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4
cdrskin/cdrskin.1
View File

@ -753,8 +753,8 @@ Device file family /dev/hdX on kernel >= 2.6 is not affected by this setting.
.TP .TP
.BI \--drive_scsi_exclusive .BI \--drive_scsi_exclusive
Linux specific: Linux specific:
Try to exclusively reserve device files /dev/srN, /dev/scdM, /dev/stK of drive. Try to exclusively reserve device files /dev/srN, /dev/scdM, /dev/sgK of drives.
this would be helpful to protect against collisions with program growisofs. This would be helpful to protect against collisions with program growisofs.
Regrettably on Linux kernel 2.4 with ide-scsi emulation this seems not to Regrettably on Linux kernel 2.4 with ide-scsi emulation this seems not to
work. Wether it becomes helpful with new Linux systems has to be evaluated. work. Wether it becomes helpful with new Linux systems has to be evaluated.
.TP .TP

2
cdrskin/cdrskin_timestamp.h
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@ -1 +1 @@
#define Cdrskin_timestamP "2007.04.04.184341" #define Cdrskin_timestamP "2007.04.09.105543"

8
libburn/os-linux.h
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@ -52,6 +52,10 @@ SIGKILL, SIGCHLD, SIGSTOP, SIGURG, SIGWINCH
typedef int burn_drive_enumerator_t; typedef int burn_drive_enumerator_t;
/* Parameters for sibling list. See sibling_fds, sibling_fnames */
#define BURN_OS_SG_MAX_SIBLINGS 5
#define BURN_OS_SG_MAX_NAMELEN 16
/* The list of operating system dependent elements in struct burn_drive. /* The list of operating system dependent elements in struct burn_drive.
Usually they are initialized in sg-*.c:enumerate_common(). Usually they are initialized in sg-*.c:enumerate_common().
*/ */
@ -60,5 +64,7 @@ int fd; \
\ \
/* ts A60926 : trying to lock against growisofs /dev/srN, /dev/scdN */ \ /* ts A60926 : trying to lock against growisofs /dev/srN, /dev/scdN */ \
int sibling_count; \ int sibling_count; \
int sibling_fds[LIBBURN_SG_MAX_SIBLINGS]; int sibling_fds[BURN_OS_SG_MAX_SIBLINGS]; \
/* ts A70409 : DDLP */ \
char sibling_fnames[BURN_OS_SG_MAX_SIBLINGS][BURN_OS_SG_MAX_NAMELEN];

105
libburn/sg-linux.c
View File

@ -75,11 +75,10 @@ Hint: You should also look into sg-freebsd-port.c, which is a younger and
#include <scsi/sg.h> #include <scsi/sg.h>
#include <scsi/scsi.h> #include <scsi/scsi.h>
/* ts A61211 : to recognize CD devices on /dev/sr* */ /* ts A61211 : to eventually recognize CD devices on /dev/sr* */
#include <linux/cdrom.h> #include <linux/cdrom.h>
/* ts A61211 : preparing for exploration of recent Linux ATA adventures */
/** PORTING : Device file families for bus scanning and drive access. /** PORTING : Device file families for bus scanning and drive access.
Both device families must support the following ioctls: Both device families must support the following ioctls:
SG_IO, SG_IO,
@ -169,7 +168,6 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
int channel_no, int target_no, int lun_no); int channel_no, int target_no, int lun_no);
/* >>> ts A61115 : this needs mending. A Linux aspect shows up in cdrskin. */
/* ts A60813 : storage objects are in libburn/init.c /* ts A60813 : storage objects are in libburn/init.c
wether to use O_EXCL with open(2) of devices wether to use O_EXCL with open(2) of devices
wether to use fcntl(,F_SETLK,) after open(2) of devices wether to use fcntl(,F_SETLK,) after open(2) of devices
@ -197,14 +195,22 @@ int mmc_function_spy(char * text);
/* This installs the device file family if one was chosen explicitely /* This installs the device file family if one was chosen explicitely
by burn_preset_device_open() by burn_preset_device_open()
*/ */
void sg_select_device_family(void) static void sg_select_device_family(void)
{ {
/* >>> ??? do we need a mutex here ? */ /* >>> ??? do we need a mutex here ? */
/* >>> (It might be concurrent but is supposed to have always /* >>> (It might be concurrent but is supposed to have always
the same effect. Any race condition should be harmless.) */ the same effect. Any race condition should be harmless.) */
if (linux_sg_auto_family) { if (burn_sg_use_family == 1)
strcpy(linux_sg_device_family, "/dev/sr%d");
else if (burn_sg_use_family == 2)
strcpy(linux_sg_device_family, "/dev/scd%d");
else if (burn_sg_use_family == 3)
strcpy(linux_sg_device_family, "/dev/st%d");
else if (burn_sg_use_family == 4)
strcpy(linux_sg_device_family, "/dev/sg%d");
else if (linux_sg_auto_family) {
int use_sr_family = 0; int use_sr_family = 0;
struct utsname buf; struct utsname buf;
@ -217,15 +223,6 @@ void sg_select_device_family(void)
strcpy(linux_sg_device_family, "/dev/sg%d"); strcpy(linux_sg_device_family, "/dev/sg%d");
linux_sg_auto_family = 0; linux_sg_auto_family = 0;
} }
if (burn_sg_use_family == 1)
strcpy(linux_sg_device_family, "/dev/sr%d");
else if (burn_sg_use_family == 2)
strcpy(linux_sg_device_family, "/dev/scd%d");
else if (burn_sg_use_family == 3)
strcpy(linux_sg_device_family, "/dev/st%d");
else if (burn_sg_use_family == 4)
strcpy(linux_sg_device_family, "/dev/sg%d");
} }
@ -279,16 +276,14 @@ static int sg_close_drive_fd(char *fname, int driveno, int *fd, int sorry)
return(0); return(0);
ret = close(*fd); ret = close(*fd);
*fd = -1337; *fd = -1337;
if(ret != -1) if(ret != -1) {
/* ts A70409 : DDLP */
/* >>> release single lock on fname */
return 1; return 1;
}
os_errno= errno; os_errno= errno;
if (fname != NULL) sprintf(msg, "Encountered error when closing drive '%s'", fname);
sprintf(msg, "Encountered error when closing drive '%s'",
fname);
else
sprintf(msg, "Encountered error when closing drive");
if (sorry) if (sorry)
sevno = LIBDAX_MSGS_SEV_SORRY; sevno = LIBDAX_MSGS_SEV_SORRY;
libdax_msgs_submit(libdax_messenger, driveno, 0x00020002, libdax_msgs_submit(libdax_messenger, driveno, 0x00020002,
@ -298,13 +293,11 @@ static int sg_close_drive_fd(char *fname, int driveno, int *fd, int sorry)
/* ts A70401 : /* ts A70401 :
In http://lkml.org/lkml/2007/3/31/187 , Alan Cox demands usage of
SG_IO on block devices and of fcntl rather than O_EXCL.
fcntl() has the unappealing property to work only after open(). fcntl() has the unappealing property to work only after open().
So libburn will by default use open(O_EXCL) first and afterwards So libburn will by default use open(O_EXCL) first and afterwards
as second assertion will use fcntl(F_SETLK). as second assertion will use fcntl(F_SETLK). One lock more should not harm.
*/ */
int sg_fcntl_lock(int *fd, char *fd_name) static int sg_fcntl_lock(int *fd, char *fd_name)
{ {
struct flock lockthing; struct flock lockthing;
char msg[81]; char msg[81];
@ -329,6 +322,10 @@ int sg_fcntl_lock(int *fd, char *fd_name)
msg, errno, 0); msg, errno, 0);
close(*fd); close(*fd);
*fd = -1; *fd = -1;
/* ts A70409 : DDLP */
/* >>> release single lock on fd_name */
return(0); return(0);
} }
return 1; return 1;
@ -341,6 +338,9 @@ static int sg_open_drive_fd(char *fname, int scan_mode)
int open_mode = O_RDWR, fd; int open_mode = O_RDWR, fd;
char msg[81]; char msg[81];
/* ts A70409 : DDLP */
/* >>> obtain single lock on fname */
/* ts A60813 - A60927 /* ts A60813 - A60927
O_EXCL with devices is a non-POSIX feature O_EXCL with devices is a non-POSIX feature
of Linux kernels. Possibly introduced 2002. of Linux kernels. Possibly introduced 2002.
@ -389,13 +389,15 @@ static int sg_open_drive_fd(char *fname, int scan_mode)
/* ts A60926 */ /* ts A60926 */
static int sg_release_siblings(int sibling_fds[], int *sibling_count) static int sg_release_siblings(int sibling_fds[],
char sibling_fnames[][BURN_OS_SG_MAX_NAMELEN],
int *sibling_count)
{ {
int i; int i;
char msg[81]; char msg[81];
for(i= 0; i < *sibling_count; i++) for(i= 0; i < *sibling_count; i++)
sg_close_drive_fd(NULL, -1, &(sibling_fds[i]), 0); sg_close_drive_fd(sibling_fnames[i], -1, &(sibling_fds[i]), 0);
if(*sibling_count > 0) { if(*sibling_count > 0) {
sprintf(msg, "Closed %d O_EXCL scsi siblings", *sibling_count); sprintf(msg, "Closed %d O_EXCL scsi siblings", *sibling_count);
libdax_msgs_submit(libdax_messenger, -1, 0x00020007, libdax_msgs_submit(libdax_messenger, -1, 0x00020007,
@ -413,7 +415,8 @@ static int sg_close_drive(struct burn_drive *d)
if (!burn_drive_is_open(d)) if (!burn_drive_is_open(d))
return 0; return 0;
sg_release_siblings(d->sibling_fds, &(d->sibling_count)); sg_release_siblings(d->sibling_fds, d->sibling_fnames,
&(d->sibling_count));
ret = sg_close_drive_fd(d->devname, d->global_index, &(d->fd), 0); ret = sg_close_drive_fd(d->devname, d->global_index, &(d->fd), 0);
return ret; return ret;
} }
@ -421,15 +424,19 @@ static int sg_close_drive(struct burn_drive *d)
/* ts A60926 */ /* ts A60926 */
static int sg_open_scsi_siblings(char *path, int driveno, static int sg_open_scsi_siblings(char *path, int driveno,
int sibling_fds[], int *sibling_count, int sibling_fds[],
int host_no, int channel_no, int id_no, int lun_no) char sibling_fnames[][BURN_OS_SG_MAX_NAMELEN],
int *sibling_count,
int host_no, int channel_no, int id_no, int lun_no)
{ {
int tld, i, ret, fd, i_bus_no = -1; int tld, i, ret, fd, i_bus_no = -1;
int i_host_no = -1, i_channel_no = -1, i_target_no = -1, i_lun_no = -1; int i_host_no = -1, i_channel_no = -1, i_target_no = -1, i_lun_no = -1;
char msg[161], fname[81]; char msg[161], fname[81];
struct stat stbuf;
dev_t last_rdev;
static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/st%d", static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/sg%d", ""};
"/dev/sg%d", ""}; /* ts A70609: removed "/dev/st%d" */
sg_select_device_family(); sg_select_device_family();
if (linux_sg_device_family[0] == 0) if (linux_sg_device_family[0] == 0)
@ -438,13 +445,18 @@ static int sg_open_scsi_siblings(char *path, int driveno,
if(host_no < 0 || id_no < 0 || channel_no < 0 || lun_no < 0) if(host_no < 0 || id_no < 0 || channel_no < 0 || lun_no < 0)
return(2); return(2);
if(*sibling_count > 0) if(*sibling_count > 0)
sg_release_siblings(sibling_fds, sibling_count); sg_release_siblings(sibling_fds, sibling_fnames,
sibling_count);
for (tld = 0; tldev[tld][0] != 0; tld++) { for (tld = 0; tldev[tld][0] != 0; tld++) {
if (strcmp(tldev[tld], linux_sg_device_family)==0) if (strcmp(tldev[tld], linux_sg_device_family)==0)
continue; continue;
for (i = 0; i < 32; i++) { for (i = 0; i < 32; i++) {
sprintf(fname, tldev[tld], i); sprintf(fname, tldev[tld], i);
if(stat(fname, &stbuf) != -1)
continue;
if (*sibling_count > 0 && last_rdev == stbuf.st_rdev)
continue;
ret = sg_obtain_scsi_adr(fname, &i_bus_no, &i_host_no, ret = sg_obtain_scsi_adr(fname, &i_bus_no, &i_host_no,
&i_channel_no, &i_target_no, &i_lun_no); &i_channel_no, &i_target_no, &i_lun_no);
if (ret <= 0) if (ret <= 0)
@ -458,7 +470,7 @@ static int sg_open_scsi_siblings(char *path, int driveno,
if (fd < 0) if (fd < 0)
goto failed; goto failed;
if (*sibling_count>=LIBBURN_SG_MAX_SIBLINGS) { if (*sibling_count>=BURN_OS_SG_MAX_SIBLINGS) {
sprintf(msg, "Too many scsi siblings of '%s'", sprintf(msg, "Too many scsi siblings of '%s'",
path); path);
libdax_msgs_submit(libdax_messenger, libdax_msgs_submit(libdax_messenger,
@ -468,18 +480,20 @@ static int sg_open_scsi_siblings(char *path, int driveno,
goto failed; goto failed;
} }
sprintf(msg, "Opened O_EXCL scsi sibling '%s' of '%s'", sprintf(msg, "Opened O_EXCL scsi sibling '%s' of '%s'",
fname, path); fname, path);
libdax_msgs_submit(libdax_messenger, driveno, libdax_msgs_submit(libdax_messenger, driveno,
0x00020004, 0x00020004,
LIBDAX_MSGS_SEV_NOTE, LIBDAX_MSGS_PRIO_HIGH, LIBDAX_MSGS_SEV_NOTE, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0); msg, 0, 0);
sibling_fds[*sibling_count] = fd; sibling_fds[*sibling_count] = fd;
strcpy(sibling_fnames[*sibling_count], fname);
(*sibling_count)++; (*sibling_count)++;
last_rdev= stbuf.st_rdev;
} }
} }
return 1; return 1;
failed:; failed:;
sg_release_siblings(sibling_fds, sibling_count); sg_release_siblings(sibling_fds, sibling_fnames, sibling_count);
return 0; return 0;
} }
@ -557,10 +571,11 @@ static void ata_enumerate(void)
static void sg_enumerate(void) static void sg_enumerate(void)
{ {
struct sg_scsi_id sid; struct sg_scsi_id sid;
int i, fd, sibling_fds[LIBBURN_SG_MAX_SIBLINGS], sibling_count= 0, ret; int i, fd, sibling_fds[BURN_OS_SG_MAX_SIBLINGS], sibling_count= 0, ret;
int sid_ret = 0; int sid_ret = 0;
int bus_no= -1, host_no= -1, channel_no= -1, target_no= -1, lun_no= -1; int bus_no= -1, host_no= -1, channel_no= -1, target_no= -1, lun_no= -1;
char fname[10]; char fname[10];
char sibling_fnames[BURN_OS_SG_MAX_SIBLINGS][BURN_OS_SG_MAX_NAMELEN];
sg_select_device_family(); sg_select_device_family();
@ -673,7 +688,8 @@ static void sg_enumerate(void)
/* ts A60927 : trying to do locking with growisofs */ /* ts A60927 : trying to do locking with growisofs */
if(burn_sg_open_o_excl>1) { if(burn_sg_open_o_excl>1) {
ret = sg_open_scsi_siblings( ret = sg_open_scsi_siblings(
fname, -1, sibling_fds, &sibling_count, fname, -1, sibling_fds, sibling_fnames,
&sibling_count,
sid.host_no, sid.channel, sid.host_no, sid.channel,
sid.scsi_id, sid.lun); sid.scsi_id, sid.lun);
if (ret<=0) { if (ret<=0) {
@ -683,7 +699,8 @@ static void sg_enumerate(void)
continue; continue;
} }
/* the final occupation will be done in sg_grab() */ /* the final occupation will be done in sg_grab() */
sg_release_siblings(sibling_fds, &sibling_count); sg_release_siblings(sibling_fds, sibling_fnames,
&sibling_count);
} }
#ifdef SCSI_IOCTL_GET_BUS_NUMBER #ifdef SCSI_IOCTL_GET_BUS_NUMBER
if(bus_no == -1) if(bus_no == -1)
@ -737,7 +754,7 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
/* Adapter specific handles and data */ /* Adapter specific handles and data */
out.fd = -1337; out.fd = -1337;
out.sibling_count = 0; out.sibling_count = 0;
for(i= 0; i<LIBBURN_SG_MAX_SIBLINGS; i++) for(i= 0; i<BURN_OS_SG_MAX_SIBLINGS; i++)
out.sibling_fds[i] = -1337; out.sibling_fds[i] = -1337;
/* PORTING: ---------------- end of non portable part ------------ */ /* PORTING: ---------------- end of non portable part ------------ */
@ -901,12 +918,15 @@ int sg_grab(struct burn_drive *d)
<<< debug: for tracing calls which might use open drive fds */ <<< debug: for tracing calls which might use open drive fds */
mmc_function_spy("sg_grab ----------- opening"); mmc_function_spy("sg_grab ----------- opening");
/* ts A70409 : DDLP */
/* >>> obtain single lock on d->devname */
/* ts A60926 */ /* ts A60926 */
if(burn_sg_open_o_excl>1) { if(burn_sg_open_o_excl>1) {
fd = -1; fd = -1;
ret = sg_open_scsi_siblings(d->devname, ret = sg_open_scsi_siblings(d->devname,
d->global_index,d->sibling_fds, d->global_index,d->sibling_fds,
&(d->sibling_count), d->sibling_fnames,&(d->sibling_count),
d->host, d->channel, d->id, d->lun); d->host, d->channel, d->id, d->lun);
if(ret <= 0) if(ret <= 0)
goto drive_is_in_use; goto drive_is_in_use;
@ -1141,6 +1161,9 @@ int sg_obtain_scsi_adr(char *path, int *bus_no, int *host_no, int *channel_no,
&& path[7] >= 'a' && path[7] <= 'z' && path[8] == 0) && path[7] >= 'a' && path[7] <= 'z' && path[8] == 0)
return 0; /* on RIP 14 all hdx return SCSI adr 0,0,0,0 */ return 0; /* on RIP 14 all hdx return SCSI adr 0,0,0,0 */
/* ts A70409 : DDLP */
/* >>> obtain single lock on path */
fd = open(path, O_RDONLY | O_NONBLOCK); fd = open(path, O_RDONLY | O_NONBLOCK);
if(fd < 0) if(fd < 0)
return 0; return 0;

2
libburn/transport.h
View File

@ -117,8 +117,6 @@ struct burn_format_descr {
}; };
#define LIBBURN_SG_MAX_SIBLINGS 16
/** Gets initialized in enumerate_common() and burn_drive_register() */ /** Gets initialized in enumerate_common() and burn_drive_register() */
struct burn_drive struct burn_drive
{ {