[Qemu-devel] [PATCH] Fix for cdrom un-eject

[Naphtali Sprei <nsprei@redhat.com>]

When guest un-eject a cdrom, re-insert the cdrom image (re-open the drive's file).

Also, related changes for the un-eject:
o  enter UNIT ATTENTION state only on change/insert media, not upon removal
o  minor change in packet command abort when in UNIT ATTENTION state (as per spec)
o  enter UNIT ATTENTION state upon reset (as per spec)
o  always print the file-name in info block command (if applicable)

Relevant Spec: Mt. Fuji Commands for Multimedia Devices Version 7: ftp://ftp.seagate.com/sff/INF-8090.PDF

Signed-off-by: Naphtali Sprei <nsprei@redhat.com>
---
 block.c       |   24 ++++++++++++++++++++----
 block.h       |    1 +
 block_int.h   |    1 +
 hw/ide/core.c |   35 +++++++++++++++++++++++++----------
 monitor.c     |    1 +
 5 files changed, 48 insertions(+), 14 deletions(-)

diff --git a/block.c b/block.c
index 6fdabff..1801569 100644
--- a/block.c
+++ b/block.c
@@ -463,6 +463,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
         ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
         bs->read_only = 1;
     }
+    bs->open_flags = flags;
     if (ret < 0) {
         qemu_free(bs->opaque);
         bs->opaque = NULL;
@@ -1155,9 +1156,11 @@ void bdrv_info(Monitor *mon)
         if (bs->removable) {
             monitor_printf(mon, " locked=%d", bs->locked);
         }
-        if (bs->drv) {
+        if (bs->filename[0]) {
             monitor_printf(mon, " file=");
             monitor_print_filename(mon, bs->filename);
+        }
+        if (bs->drv) {
             if (bs->backing_file[0] != '\0') {
                 monitor_printf(mon, " backing_file=");
                 monitor_print_filename(mon, bs->backing_file);
@@ -1907,14 +1910,27 @@ int bdrv_eject(BlockDriverState *bs, int eject_flag)
         ret = drv->bdrv_eject(bs, eject_flag);
     }
     if (ret == -ENOTSUP) {
-        if (eject_flag)
+        if (eject_flag) {
             bdrv_close(bs);
-        ret = 0;
+            ret = 0;
+        } else { /* re-insert media */
+            if (bs->filename[0]) {
+                ret = bdrv_open(bs, bs->filename, bs->open_flags);
+            } else {
+                ret = 0;
+            }
+        }
     }
-
+    
     return ret;
 }
 
+
+void bdrv_forget_fname(BlockDriverState *bs)
+{
+    bs->filename[0] = '\0';
+}
+
 int bdrv_is_locked(BlockDriverState *bs)
 {
     return bs->locked;
diff --git a/block.h b/block.h
index 2d4f066..8fc10d2 100644
--- a/block.h
+++ b/block.h
@@ -147,6 +147,7 @@ int bdrv_media_changed(BlockDriverState *bs);
 int bdrv_is_locked(BlockDriverState *bs);
 void bdrv_set_locked(BlockDriverState *bs, int locked);
 int bdrv_eject(BlockDriverState *bs, int eject_flag);
+void bdrv_forget_fname(BlockDriverState *bs);
 void bdrv_set_change_cb(BlockDriverState *bs,
                         void (*change_cb)(void *opaque), void *opaque);
 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
diff --git a/block_int.h b/block_int.h
index 7ebe926..1ecf7bf 100644
--- a/block_int.h
+++ b/block_int.h
@@ -137,6 +137,7 @@ struct BlockDriverState {
     void *opaque;
 
     char filename[1024];
+    int  open_flags;
     char backing_file[1024]; /* if non zero, the image is a diff of
                                 this file image */
     char backing_format[16]; /* if non-zero and backing_file exists */
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 7b1ff8f..5631898 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -35,6 +35,20 @@
 
 #include <hw/ide/internal.h>
 
+
+static int is_pcommand_abort_on_check(uint8_t pcmd) {
+    int ret = 1;
+
+    if (pcmd == GPCMD_GET_CONFIGURATION ||
+        pcmd == GPCMD_REQUEST_SENSE ||
+	pcmd == GPCMD_INQUIRY) {
+        ret = 0;
+    }
+    return ret;
+}
+
+
+
 static int smart_attributes[][5] = {
     /* id,  flags, val, wrst, thrsh */
     { 0x01, 0x03, 0x64, 0x64, 0x06}, /* raw read */
@@ -1206,12 +1220,11 @@ static void ide_atapi_cmd(IDEState *s)
     }
 #endif
     /* If there's a UNIT_ATTENTION condition pending, only
-       REQUEST_SENSE and INQUIRY commands are allowed to complete. */
+       REQUEST_SENSE and INQUIRY commands (and some more) are allowed to complete. */
     if (s->sense_key == SENSE_UNIT_ATTENTION &&
-	s->io_buffer[0] != GPCMD_REQUEST_SENSE &&
-	s->io_buffer[0] != GPCMD_INQUIRY) {
-	ide_atapi_cmd_check_status(s);
-	return;
+        is_pcommand_abort_on_check(s->io_buffer[0])) {
+        ide_atapi_cmd_check_status(s);
+        return;
     }
     switch(s->io_buffer[0]) {
     case GPCMD_TEST_UNIT_READY:
@@ -1676,9 +1689,11 @@ static void cdrom_change_cb(void *opaque)
     bdrv_get_geometry(s->bs, &nb_sectors);
     s->nb_sectors = nb_sectors;
 
-    s->sense_key = SENSE_UNIT_ATTENTION;
-    s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
-    s->cdrom_changed = 1;
+    if (nb_sectors > 0) { /* UNIT_ATTENTION only for insertion/change, not removal */
+        s->sense_key = SENSE_UNIT_ATTENTION;
+        s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
+        s->cdrom_changed = 1;
+    }
     ide_set_irq(s->bus);
 }
 
@@ -2530,8 +2545,8 @@ static void ide_reset(IDEState *s)
     s->lba48 = 0;
 
     /* ATAPI specific */
-    s->sense_key = 0;
-    s->asc = 0;
+    s->sense_key = SENSE_UNIT_ATTENTION;
+    s->asc = 0x29; /*  POWER ON, RESET, OR BUS DEVICE RESET OCCURRED */
     s->cdrom_changed = 0;
     s->packet_transfer_size = 0;
     s->elementary_transfer_size = 0;
diff --git a/monitor.c b/monitor.c
index 3286ba2..69c50f8 100644
--- a/monitor.c
+++ b/monitor.c
@@ -567,6 +567,7 @@ static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
         }
         bdrv_close(bs);
     }
+    bdrv_forget_fname(bs); /* "manual" eject forgets the file-name */
     return 0;
 }
 
-- 
1.6.3.3