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Subject[PATCH] ide-floppy ATAPI format capability (official)
Hi everyone,

This is Sam Varshavchik's ATAPI format patch, synced in with my update
to the driver. It requires ide-floppy.c V0.96. This patch brings the
driver to 0.97.

This patch updates ide-floppy to include ATAPI formatting ioctls. Like
other devices, we allow O_NDELAY to open a drive without a disk, or with
an unreadable disk, so that we can get the format capacity of the drive
or begin the format.

This has not yet been extensively tested. Anyone with an LS-120 drive
is welcome to format 1.44MB floppies with it. You will need Sams floppy
formatting utility which is available at
http://www.email-scan.com/floppy.

Feedback is welcome.

Regards,

Paul Bristow

Linux IDE-Floppy Maintainer

Patch follows:


--- linux/drivers/ide/ide-floppy-0.96.c Sun Jan 14 23:29:02 2001
+++ linux/drivers/ide/ide-floppy.c Sun Jan 14 23:49:23 2001
@@ -1,5 +1,5 @@
/*
- * linux/drivers/ide/ide-floppy.c Version 0.96 Jan 7, 2001
+ * linux/drivers/ide/ide-floppy.c Version 0.97 Jan 14 2001
*
* Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
* Copyright (C) 2000 - 2001 Paul Bristow <paul@paulbristow.net>
@@ -46,10 +46,34 @@
* Ver 0.95 Nov 7 00 Brought across to kernel 2.4
* Ver 0.96 Jan 7 01 Actually in line with release version of 2.4.0
* including set_bit patch from Rusty Russel
+ * Ver 0.96.sv Jan 6 01 Sam Varshavchik <mrsam@courier-mta.com>
+ * Implement low level formatting. Reimplemented
+ * IDEFLOPPY_CAPABILITIES_PAGE, since we need the
srfp
+ * bit. My LS-120 drive barfs on
+ * IDEFLOPPY_CAPABILITIES_PAGE, but maybe it's
just me.
+ * Compromise by not reporting a failure to get
this
+ * mode page. Implemented four IOCTLs in order
to
+ * implement formatting. IOCTls begin with
0x4600,
+ * 0x46 is 'F' as in Format.
+ * Also, O_NDELAY on open will allow the device
to be
+ * opened without a disk available. This can be
used to
+ * open an unformatted disk, or get the device
capacity.
*
+ * Jan 9 01 Userland option to select format verify.
+ * Added PC_SUPPRESS_ERROR flag - some idefloppy
drives
+ * do not implement IDEFLOPPY_CAPABILITIES_PAGE,
and
+ * return a sense error. Suppress error
reporting in
+ * this particular case in order to avoid
spurious
+ * errors in syslog. The culprit is
+ * idefloppy_get_capability_page(), so move it to
+ * idefloppy_begin_format() so that it's not used
+ * unless absolutely necessary.
+ * If drive does not support format progress
indication
+ * monitor the dsc bit in the status register.
+ * Ver 0.97 Jan 14 01 Issued release 0.97 for kernel 2.4.0
*/

-#define IDEFLOPPY_VERSION "0.96"
+#define IDEFLOPPY_VERSION "0.97"

#include <linux/config.h>
#include <linux/module.h>
@@ -136,6 +160,8 @@
#define PC_DMA_ERROR 4 /* 1 when
encountered problem during DMA */
#define PC_WRITING 5 /* Data
direction */

+#define PC_SUPPRESS_ERROR 6 /* Suppress
error reporting */
+
/*
* Removable Block Access Capabilities Page
*/
@@ -249,6 +275,7 @@
* Last error information
*/
byte sense_key, asc, ascq;
+ int progress_indication;

/*
* Device information
@@ -257,7 +284,7 @@
idefloppy_capacity_descriptor_t capacity; /* Last
format capacity */
idefloppy_flexible_disk_page_t flexible_disk_page; /* Copy
of the flexible disk page */
int wp; /* Write
protect */
-
+ int srfp; /* Supports format progress
report */
unsigned long flags; /* Status/Action flags :
long for set_bit() */
} idefloppy_floppy_t;

@@ -269,6 +296,7 @@
#define IDEFLOPPY_USE_READ12 2 /* Use READ12/WRITE12 or
READ10/WRITE10 */
#define IDEFLOPPY_CLIK_DRIVE 3 /* Avoid commands not
supported in Clik drive */
#define IDEFLOPPY_POWERBOOK_ZIP 4 /* Kludge for Apple Powerbook
Zip drive */
+#define IDEFLOPPY_FORMAT_IN_PROGRESS 5 /* Format in progress */

/*
* ATAPI floppy drive packet commands
@@ -299,6 +327,15 @@
#define MODE_SENSE_SAVED 0x03

/*
+ * IOCTLs used in low-level formatting.
+ */
+
+#define IDEFLOPPY_IOCTL_FORMAT_SUPPORTED 0x4600
+#define IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY 0x4601
+#define IDEFLOPPY_IOCTL_FORMAT_START 0x4602
+#define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS 0x4603
+
+/*
* Special requests for our block device strategy routine.
*/
#define IDEFLOPPY_FIRST_RQ 90
@@ -582,7 +619,7 @@
u8 asc; /* Additional Sense Code
*/
u8 ascq; /* Additional Sense Code
Qualifier */
u8 replaceable_unit_code; /* Field Replaceable
Unit Code */
- u8 reserved[3];
+ u8 sksv[3];
u8 pad[2]; /* Padding to 20 bytes
*/
} idefloppy_request_sense_result_t;

@@ -767,6 +804,9 @@
idefloppy_floppy_t *floppy = drive->driver_data;

floppy->sense_key = result->sense_key; floppy->asc =
result->asc; floppy->ascq = result->ascq;
+ floppy->progress_indication= result->sksv[0] & 0x80 ?
+ (unsigned short)get_unaligned((u16
*)(result->sksv+1)):0x10000;
+
if (floppy->failed_pc) {
IDEFLOPPY_DEBUG("ide-floppy: pc = %x, sense key = %x, asc = %x,
ascq =
%x\n",floppy->failed_pc->c[0],result->sense_key,result->asc,result->ascq);
}
@@ -990,8 +1030,11 @@
* a legitimate error code was received.
*/
if (!test_bit (PC_ABORT, &pc->flags)) {
+ if (!test_bit (PC_SUPPRESS_ERROR, &pc->flags)) {
+ ;
IDEFLOPPY_DEBUG( "ide-floppy: %s: I/O error, pc = %2x, key = %2x,
asc = %2x, ascq = %2x\n",
drive->name, pc->c[0],
floppy->sense_key, floppy->asc, floppy->ascq);
+ }
pc->error = IDEFLOPPY_ERROR_GENERAL;
/* Giving up */
}
floppy->failed_pc=NULL;
@@ -1063,6 +1106,27 @@
pc->request_transfer = 255;
}

+static void idefloppy_create_format_unit_cmd (idefloppy_pc_t *pc, int
b, int l,
+ int flags)
+{
+ idefloppy_init_pc (pc);
+ pc->c[0] = IDEFLOPPY_FORMAT_UNIT_CMD;
+ pc->c[1] = 0x17;
+
+ memset(pc->buffer, 0, 12);
+ pc->buffer[1] = 0xA2;
+ /* Default format list header, byte 1: FOV/DCRT/IMM bits set */
+
+ if (flags & 1) /* Verify bit on... */
+ pc->buffer[1] ^= 0x20; /* ... turn off DCRT bit
*/
+ pc->buffer[3] = 8;
+
+ put_unaligned(htonl(b), (unsigned int *)(&pc->buffer[4]));
+ put_unaligned(htonl(l), (unsigned int *)(&pc->buffer[8]));
+ pc->buffer_size=12;
+ set_bit(PC_WRITING, &pc->flags);
+}
+
/*
* A mode sense command is used to "sense" floppy parameters.
*/
@@ -1233,6 +1297,28 @@
}


+static int idefloppy_get_capability_page(ide_drive_t *drive)
+{
+ idefloppy_floppy_t *floppy = drive->driver_data;
+ idefloppy_pc_t pc;
+ idefloppy_mode_parameter_header_t *header;
+ idefloppy_capabilities_page_t *page;
+
+ floppy->srfp=0;
+ idefloppy_create_mode_sense_cmd (&pc,
IDEFLOPPY_CAPABILITIES_PAGE,
+ MODE_SENSE_CURRENT);
+
+ set_bit(PC_SUPPRESS_ERROR, &pc.flags);
+ if (idefloppy_queue_pc_tail (drive,&pc)) {
+ return 1;
+ }
+
+ header = (idefloppy_mode_parameter_header_t *) pc.buffer;
+ page= (idefloppy_capabilities_page_t *)(header+1);
+ floppy->srfp=page->srfp;
+ return (0);
+}
+
/*
* Determine if a media is present in the floppy drive, and if so,
* its LBA capacity.
@@ -1305,6 +1391,186 @@


/*
+** Obtain the list of formattable capacities.
+** Very similar to idefloppy_get_capacity, except that we push the
capacity
+** descriptors to userland, instead of our own structures.
+**
+** Userland gives us the following structure:
+**
+** struct idefloppy_format_capacities {
+** int nformats;
+** struct {
+** int nblocks;
+** int blocksize;
+** } formats[];
+** } ;
+**
+** userland initializes nformats to the number of allocated formats[]
+** records. On exit we set nformats to the number of records we've
+** actually initialized.
+**
+*/
+
+static int idefloppy_get_format_capacities (ide_drive_t *drive,
+ struct inode *inode,
+ struct file *file,
+ int *arg) /* Cheater */
+{
+ idefloppy_pc_t pc;
+ idefloppy_capacity_header_t *header;
+ idefloppy_capacity_descriptor_t *descriptor;
+ int i, descriptors, blocks, length;
+ int u_array_size;
+ int u_index;
+ int *argp;
+
+ if (get_user(u_array_size, arg))
+ return (-EFAULT);
+
+ if (u_array_size <= 0)
+ return (-EINVAL);
+
+ idefloppy_create_read_capacity_cmd (&pc);
+ if (idefloppy_queue_pc_tail (drive, &pc)) {
+ printk (KERN_ERR "ide-floppy: Can't get floppy
parameters\n");
+ return (-EIO);
+ }
+ header = (idefloppy_capacity_header_t *) pc.buffer;
+ descriptors = header->length /
+ sizeof (idefloppy_capacity_descriptor_t);
+ descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);
+
+ u_index=0;
+ argp=arg+1;
+
+ /*
+ ** We always skip the first capacity descriptor. That's the
+ ** current capacity. We are interested in the remaining
descriptors,
+ ** the formattable capacities.
+ */
+
+ for (i=0; i<descriptors; i++, descriptor++)
+ {
+ if (u_index >= u_array_size)
+ break; /* User-supplied buffer too small */
+ if (i == 0)
+ continue; /* Skip the first descriptor */
+
+ blocks = ntohl (descriptor->blocks);
+ length = ntohs (descriptor->length);
+
+ if (put_user(blocks, argp))
+ return (-EFAULT);
+ ++argp;
+
+ if (put_user(length, argp))
+ return (-EFAULT);
+ ++argp;
+
+ ++u_index;
+ }
+
+ if (put_user(u_index, arg))
+ return (-EFAULT);
+ return (0);
+}
+
+/*
+** Send ATAPI_FORMAT_UNIT to the drive.
+**
+** Userland gives us the following structure:
+**
+** struct idefloppy_format_command {
+** int nblocks;
+** int blocksize;
+** int flags;
+** } ;
+**
+** flags is a bitmask, currently, the only defined flag is:
+**
+** 0x01 - verify media after format.
+*/
+
+static int idefloppy_begin_format(ide_drive_t *drive,
+ struct inode *inode,
+ struct file *file,
+ int *arg)
+{
+ int blocks;
+ int length;
+ int flags;
+ idefloppy_pc_t pc;
+
+ if (get_user(blocks, arg)
+ || get_user(length, arg+1)
+ || get_user(flags, arg+2))
+ {
+ return (-EFAULT);
+ }
+
+ (void) idefloppy_get_capability_page (drive); /* Get the SFRP
bit */
+ idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
+ if (idefloppy_queue_pc_tail (drive, &pc))
+ {
+ return (-EIO);
+ }
+ return (0);
+}
+
+/*
+** Get ATAPI_FORMAT_UNIT progress indication.
+**
+** Userland gives a pointer to an int. The int is set to a progresss
+** indicator 0-65536, with 65536=100%.
+**
+** If the drive does not support format progress indication, we just
check
+** the dsc bit, and return either 0 or 65536.
+*/
+
+static int idefloppy_get_format_progress(ide_drive_t *drive,
+ struct inode *inode,
+ struct file *file,
+ int *arg)
+{
+ idefloppy_floppy_t *floppy = drive->driver_data;
+ idefloppy_pc_t pc;
+ int progress_indication=0x10000;
+
+ if (floppy->srfp)
+ {
+ idefloppy_create_request_sense_cmd(&pc);
+ if (idefloppy_queue_pc_tail (drive, &pc))
+ {
+ return (-EIO);
+ }
+
+ if (floppy->sense_key == 2 && floppy->asc == 4 &&
+ floppy->ascq == 4)
+ {
+ progress_indication=floppy->progress_indication;
+ }
+ /* Else assume format_unit has finished, and we're
+ ** at 0x10000 */
+ }
+ else
+ {
+ idefloppy_status_reg_t status;
+ unsigned long flags;
+
+ __save_flags(flags);
+ __cli();
+ status.all=GET_STAT();
+ __restore_flags(flags);
+
+ progress_indication= !status.b.dsc ? 0:0x10000;
+ }
+ if (put_user(progress_indication, arg))
+ return (-EFAULT);
+
+ return (0);
+}
+
+/*
* Our special ide-floppy ioctl's.
*
* Supports eject command
@@ -1315,7 +1581,8 @@
idefloppy_pc_t pc;
idefloppy_floppy_t *floppy = drive->driver_data;

- if (cmd == CDROMEJECT) {
+ switch (cmd) {
+ case CDROMEJECT:
if (drive->usage > 1)
return -EBUSY;
/* The IOMEGA Clik! Drive doesn't support this command - no room
for an eject mechanism */
@@ -1326,6 +1593,51 @@
idefloppy_create_start_stop_cmd (&pc, 2);
(void) idefloppy_queue_pc_tail (drive, &pc);
return 0;
+ case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
+ return (0);
+ case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
+ return (idefloppy_get_format_capacities(drive, inode,
file,
+ (int *)arg));
+ case IDEFLOPPY_IOCTL_FORMAT_START:
+
+ if (!(file->f_mode & 2))
+ return (-EPERM);
+
+ {
+ idefloppy_floppy_t *floppy = drive->driver_data;
+
+ set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
&floppy->flags);
+
+ if (drive->usage > 1)
+ {
+ /* Don't format if someone is using the
disk */
+
+ clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
+ &floppy->flags);
+ return -EBUSY;
+ }
+ else
+ {
+ int rc=idefloppy_begin_format(drive,
inode,
+ file,
+ (int
*)arg);
+
+ if (rc)
+
clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
+ &floppy->flags);
+ return (rc);
+
+ /*
+ ** Note, the bit will be cleared when the device
is
+ ** closed. This is the cleanest way to handle
the
+ ** situation where the drive does not support
+ ** format progress reporting.
+ */
+ }
+ }
+ case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
+ return (idefloppy_get_format_progress(drive, inode,
file,
+ (int *)arg));
}
return -EIO;
}
@@ -1342,6 +1654,10 @@

MOD_INC_USE_COUNT;
if (drive->usage == 1) {
+
+ clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
+ /* Just in case */
+
IDEFLOPPY_DEBUG( "Testing if unit is ready...\n");
idefloppy_create_test_unit_ready_cmd(&pc);
if (idefloppy_queue_pc_tail(drive, &pc)) {
@@ -1352,7 +1668,14 @@
{
IDEFLOPPY_DEBUG( "Yes unit is ready\n");
}
- if (idefloppy_get_capacity (drive)) {
+ if (idefloppy_get_capacity (drive)
+ && (filp->f_flags & O_NDELAY) == 0
+ /*
+ ** Allow O_NDELAY to open a drive without a disk, or
with
+ ** an unreadable disk, so that we can get the format
+ ** capacity of the drive or begin the format - Sam
+ */
+ ) {
drive->usage--;
MOD_DEC_USE_COUNT;
IDEFLOPPY_DEBUG( "I/O Error Getting Capacity\n");
@@ -1371,6 +1694,12 @@
}
check_disk_change(inode->i_rdev);
}
+ else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags))
+ {
+ drive->usage--;
+ MOD_DEC_USE_COUNT;
+ return -EBUSY;
+ }
return 0;
}

@@ -1387,6 +1716,7 @@
if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
idefloppy_create_prevent_cmd (&pc, 0);
(void) idefloppy_queue_pc_tail (drive, &pc);
+ clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
}
}
MOD_DEC_USE_COUNT;
-
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