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Switched from O_NONBLOCK to O_NDELAY (see http://lkml.org/lkml/2007/4/11/141)

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This commit is contained in:
Thomas Schmitt
2007-04-13 17:12:06 +00:00
parent e1b8edb437
commit ab5f39b8bb
3 changed files with 76 additions and 35 deletions
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2
cdrskin/cdrskin_timestamp.h
View File

@@ -1 +1 @@
#define Cdrskin_timestamP "2007.04.10.144840"
#define Cdrskin_timestamP "2007.04.13.171347"

5
libburn/libdax_msgs.h
View File

@@ -300,9 +300,10 @@ Range "scdbackup" : 0x00020000 to 0x0002ffff
0x00020002 (SORRY,HIGH) = Encountered error when closing drive
0x00020003 (SORRY,HIGH) = Could not grab drive
0x00020004 (NOTE,HIGH) = Opened O_EXCL scsi sibling
0x00020005 (FATAL,HIGH) = Failed to open device
0x00020005 (SORRY,HIGH) = Failed to open device
0x00020006 (FATAL,HIGH) = Too many scsi siblings
0x00020007 (NOTE,HIGH) = Closed O_EXCL scsi siblings
0x00020008 (SORRY,HIGH) = Device busy. Failed to fcntl-lock
General library operations:
@@ -365,7 +366,7 @@ Range "scdbackup" : 0x00020000 to 0x0002ffff
0x00020138 (FATAL,HIGH) = Cannot reserve track
0x00020139 (SORRY,HIGH) = Write job parameters are unsuitable
0x0002013a (FATAL,HIGH) = No suitable media detected
0x0002013b (FATAL,HIGH) = Failed to fcntl-lock device
0x0002013b
0x0002013c (SORRY,HIGH) = Malformed capabilities page 2Ah received
libdax_audioxtr:

104
libburn/sg-linux.c
View File

@@ -79,6 +79,11 @@ Hint: You should also look into sg-freebsd-port.c, which is a younger and
#include <linux/cdrom.h>
/** Indication of the Linux kernel this software is running on */
/* -1 = not evaluated , 0 = unrecognizable , 1 = 2.4 , 2 = 2.6 */
static int sg_kernel_age = -1;
/** PORTING : Device file families for bus scanning and drive access.
Both device families must support the following ioctls:
SG_IO,
@@ -191,6 +196,24 @@ int mmc_function_spy(char * text);
/* (Public functions are listed below) */
/* ------------------------------------------------------------------------ */
/* ts A70413 */
/* This finds out wether the software is running on kernel >= 2.6
*/
static void sg_evaluate_kernel(void)
{
struct utsname buf;
if (sg_kernel_age >= 0)
return;
sg_kernel_age = 0;
if (uname(&buf) == -1)
return;
sg_kernel_age = 1;
if (strcmp(buf.release, "2.6") >= 0)
sg_kernel_age = 2;
}
/* ts A70314 */
/* This installs the device file family if one was chosen explicitely
by burn_preset_device_open()
@@ -211,13 +234,8 @@ static void sg_select_device_family(void)
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;
struct utsname buf;
if (uname(&buf) != -1)
if (strcmp(buf.release, "2.6") >= 0)
use_sr_family = 1;
if (use_sr_family)
sg_evaluate_kernel();
if (sg_kernel_age >= 2)
strcpy(linux_sg_device_family, "/dev/sr%d");
else
strcpy(linux_sg_device_family, "/dev/sg%d");
@@ -277,7 +295,7 @@ static int sg_close_drive_fd(char *fname, int driveno, int *fd, int sorry)
ret = close(*fd);
*fd = -1337;
if(ret != -1) {
/* ts A70409 : DDLP */
/* ts A70409 : DDLP-B */
/* >>> release single lock on fname */
return 1;
}
@@ -297,7 +315,7 @@ static int sg_close_drive_fd(char *fname, int driveno, int *fd, int sorry)
So libburn will by default use open(O_EXCL) first and afterwards
as second assertion will use fcntl(F_SETLK). One lock more should not harm.
*/
static int sg_fcntl_lock(int *fd, char *fd_name)
static int sg_fcntl_lock(int *fd, char *fd_name, int l_type, int verbous)
{
struct flock lockthing;
char msg[81];
@@ -307,23 +325,28 @@ static int sg_fcntl_lock(int *fd, char *fd_name)
return 1;
memset(&lockthing, 0, sizeof(lockthing));
lockthing.l_type = F_WRLCK;
lockthing.l_type = l_type;
lockthing.l_whence = SEEK_SET;
lockthing.l_start = 0;
lockthing.l_len = 0;
/*
fprintf(stderr,"LIBBURN_EXPERIMENTAL: fcntl(%d, F_SETLK, )\n", *fd);
fprintf(stderr,"LIBBURN_EXPERIMENTAL: fcntl(%d, F_SETLK, %s)\n",
*fd, l_type == F_WRLCK ? "F_WRLCK" : "F_RDLCK");
*/
ret = fcntl(*fd, F_SETLK, &lockthing);
if (ret == -1) {
sprintf(msg, "Failed to fcntl-lock device '%s'",fd_name);
libdax_msgs_submit(libdax_messenger, -1, 0x00020005,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
if (verbous) {
sprintf(msg, "Device busy. Failed to fcntl-lock '%s'",
fd_name);
libdax_msgs_submit(libdax_messenger, -1, 0x00020008,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, errno, 0);
}
close(*fd);
*fd = -1;
/* ts A70409 : DDLP */
/* ts A70409 : DDLP-B */
/* >>> release single lock on fd_name */
return(0);
@@ -338,7 +361,7 @@ static int sg_open_drive_fd(char *fname, int scan_mode)
int open_mode = O_RDWR, fd;
char msg[81];
/* ts A70409 : DDLP */
/* ts A70409 : DDLP-B */
/* >>> obtain single lock on fname */
/* ts A60813 - A60927
@@ -350,17 +373,22 @@ static int sg_open_drive_fd(char *fname, int scan_mode)
/* ts A60813
O_NONBLOCK was already hardcoded in ata_ but not in sg_.
There must be some reason for this. So O_NONBLOCK is
default mode for both now. Disable on own risk. */
default mode for both now. Disable on own risk.
ts A70411
Switched to O_NDELAY for LKML statement 2007/4/11/141 by Alan Cox:
"open() has side effects. The CD layer allows you to open
with O_NDELAY if you want to avoid them."
*/
if(burn_sg_open_o_nonblock)
open_mode |= O_NONBLOCK;
open_mode |= O_NDELAY;
/* <<< debugging
fprintf(stderr,
"\nlibburn: experimental: o_excl= %d , o_nonblock= %d, abort_on_busy= %d\n",
burn_sg_open_o_excl,burn_sg_open_o_nonblock,burn_sg_open_abort_busy);
fprintf(stderr,
"libburn: experimental: O_EXCL= %d , O_NONBLOCK= %d\n",
!!(open_mode&O_EXCL),!!(open_mode&O_NONBLOCK));
"libburn: experimental: O_EXCL= %d , O_NDELAY= %d\n",
!!(open_mode&O_EXCL),!!(open_mode&O_NDELAY));
*/
fd = open(fname, open_mode);
@@ -379,11 +407,11 @@ static int sg_open_drive_fd(char *fname, int scan_mode)
return -1;
sprintf(msg, "Failed to open device '%s'",fname);
libdax_msgs_submit(libdax_messenger, -1, 0x00020005,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
msg, errno, 0);
return -1;
}
sg_fcntl_lock(&fd, fname);
sg_fcntl_lock(&fd, fname, F_WRLCK, 1);
return fd;
}
@@ -909,9 +937,12 @@ int sg_grab(struct burn_drive *d)
open_mode |= O_EXCL;
/* ts A60813
O_NONBLOCK was hardcoded here. So it should stay default mode. */
O_NONBLOCK was hardcoded here. So it should stay default mode.
ts A70411
Switched to O_NDELAY for LKML statement 2007/4/11/141
*/
if(burn_sg_open_o_nonblock)
open_mode |= O_NONBLOCK;
open_mode |= O_NDELAY;
/* ts A60813 - A60822
After enumeration the drive fd is probably still open.
@@ -924,7 +955,7 @@ int sg_grab(struct burn_drive *d)
<<< debug: for tracing calls which might use open drive fds */
mmc_function_spy("sg_grab ----------- opening");
/* ts A70409 : DDLP */
/* ts A70409 : DDLP-B */
/* >>> obtain single lock on d->devname */
/* ts A60926 */
@@ -940,8 +971,11 @@ int sg_grab(struct burn_drive *d)
fd = open(d->devname, open_mode);
os_errno = errno;
if (fd >= 0)
sg_fcntl_lock(&fd, d->devname);
if (fd >= 0) {
sg_fcntl_lock(&fd, d->devname, F_WRLCK, 1);
if (fd < 0)
goto drive_is_in_use;
}
} else
fd= d->fd;
@@ -1155,27 +1189,33 @@ ex:;
int sg_obtain_scsi_adr(char *path, int *bus_no, int *host_no, int *channel_no,
int *target_no, int *lun_no)
{
int fd, ret, l, open_mode = O_RDWR | O_NONBLOCK;
int fd, ret, l, open_mode = O_RDONLY;
struct my_scsi_idlun {
int x;
int host_unique_id;
};
struct my_scsi_idlun idlun;
l = strlen(linux_ata_device_family) - 2;
if (l > 0 && strncmp(path, linux_ata_device_family, l) == 0
&& path[7] >= 'a' && path[7] <= 'z' && path[8] == 0)
return 0; /* on RIP 14 all hdx return SCSI adr 0,0,0,0 */
/* ts A70409 : DDLP */
/* ts A70409 : DDLP-B */
/* >>> obtain single lock on path */
if(burn_sg_open_o_excl)
open_mode |= O_EXCL;
if(burn_sg_open_o_nonblock)
open_mode |= O_NDELAY;
if(burn_sg_open_o_excl) {
/* O_EXCL | O_RDONLY does not work with /dev/sg* on
SuSE 9.0 (kernel 2.4) and SuSE 9.3 (kernel 2.6) */
/* so skip it for now */;
}
fd = open(path, open_mode);
if(fd < 0)
return 0;
sg_fcntl_lock(&fd, path);
sg_fcntl_lock(&fd, path, F_RDLCK, 0);
if(fd < 0)
return 0;