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reopen device when the requested access mode changes

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This commit is contained in:
Colin Watson 2010-03-03 20:03:50 +00:00
parent 22d7b6137a
commit c6293875f9
1 changed files with 16 additions and 4 deletions
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20
util/hostdisk.c
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@ -107,6 +107,7 @@ struct
struct grub_util_biosdisk_data
{
char *dev;
int access_mode;
int fd;
};
@ -183,6 +184,7 @@ grub_util_biosdisk_open (const char *name, grub_disk_t disk)
disk->id = drive;
disk->data = data = xmalloc (sizeof (struct grub_util_biosdisk_data));
data->dev = NULL;
data->access_mode = 0;
data->fd = -1;
/* Get the size. */
@ -383,13 +385,18 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
&& strncmp (map[disk->id].device, "/dev/", 5) == 0)
is_partition = linux_find_partition (dev, disk->partition->start);
if (data->dev && strcmp (data->dev, dev) == 0)
if (data->dev && strcmp (data->dev, dev) == 0 &&
data->access_mode == (flags & O_ACCMODE))
{
grub_dprintf ("hostdisk", "reusing open device `%s'\n", dev);
fd = data->fd;
}
else
{
free (data->dev);
if (data->fd != -1)
close (data->fd);
/* Open the partition. */
grub_dprintf ("hostdisk", "opening the device `%s' in open_device()\n", dev);
fd = open (dev, flags);
@ -403,8 +410,8 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
XXX: This also empties the buffer cache. */
ioctl (fd, BLKFLSBUF, 0);
free (data->dev);
data->dev = xstrdup (dev);
data->access_mode = (flags & O_ACCMODE);
data->fd = fd;
}
@ -430,18 +437,23 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
}
#endif
if (data->dev && strcmp (data->dev, map[disk->id].device) == 0)
if (data->dev && strcmp (data->dev, map[disk->id].device) == 0 &&
data->access_mode == (flags & O_ACCMODE))
{
grub_dprintf ("hostdisk", "reusing open device `%s'\n", data->dev);
fd = data->fd;
}
else
{
free (data->dev);
if (data->fd != -1)
close (data->fd);
fd = open (map[disk->id].device, flags);
if (fd >= 0)
{
free (data->dev);
data->dev = xstrdup (map[disk->id].device);
data->access_mode = (flags & O_ACCMODE);
data->fd = fd;
}
}