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Rewrite blocklist functions in order to get progress when

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reading large extents and decrease amount of blocklist hook calls.
This commit is contained in:
Vladimir Serbinenko 2013-11-01 23:28:03 +01:00
parent 896f913571
commit cb72aa1809
20 changed files with 220 additions and 181 deletions
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101
grub-core/disk/scsi.c
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@ -606,6 +606,13 @@ grub_scsi_open (const char *name, grub_disk_t disk)
}
disk->total_sectors = scsi->last_block + 1;
/* PATA doesn't support more than 32K reads.
Not sure about AHCI and USB. If it's confirmed that either of
them can do bigger reads reliably this value can be moved to 'scsi'
structure. */
disk->max_agglomerate = 32768 >> (GRUB_DISK_SECTOR_BITS
+ GRUB_DISK_CACHE_BITS);
if (scsi->blocksize & (scsi->blocksize - 1) || !scsi->blocksize)
{
grub_free (scsi);
@ -647,40 +654,27 @@ grub_scsi_read (grub_disk_t disk, grub_disk_addr_t sector,
scsi = disk->data;
while (size)
grub_err_t err;
/* Depending on the type, select a read function. */
switch (scsi->devtype)
{
/* PATA doesn't support more than 32K reads.
Not sure about AHCI and USB. If it's confirmed that either of
them can do bigger reads reliably this value can be moved to 'scsi'
structure. */
grub_size_t len = 32768 >> disk->log_sector_size;
grub_err_t err;
if (len > size)
len = size;
/* Depending on the type, select a read function. */
switch (scsi->devtype)
{
case grub_scsi_devtype_direct:
if (sector >> 32)
err = grub_scsi_read16 (disk, sector, len, buf);
else
err = grub_scsi_read10 (disk, sector, len, buf);
if (err)
return err;
break;
case grub_scsi_devtype_direct:
if (sector >> 32)
err = grub_scsi_read16 (disk, sector, size, buf);
else
err = grub_scsi_read10 (disk, sector, size, buf);
if (err)
return err;
break;
case grub_scsi_devtype_cdrom:
if (sector >> 32)
err = grub_scsi_read16 (disk, sector, len, buf);
else
err = grub_scsi_read12 (disk, sector, len, buf);
if (err)
return err;
break;
}
size -= len;
sector += len;
buf += len << disk->log_sector_size;
case grub_scsi_devtype_cdrom:
if (sector >> 32)
err = grub_scsi_read16 (disk, sector, size, buf);
else
err = grub_scsi_read12 (disk, sector, size, buf);
if (err)
return err;
break;
}
return GRUB_ERR_NONE;
@ -718,10 +712,10 @@ grub_scsi_read (grub_disk_t disk, grub_disk_addr_t sector,
}
static grub_err_t
grub_scsi_write (grub_disk_t disk __attribute((unused)),
grub_disk_addr_t sector __attribute((unused)),
grub_size_t size __attribute((unused)),
const char *buf __attribute((unused)))
grub_scsi_write (grub_disk_t disk,
grub_disk_addr_t sector,
grub_size_t size,
const char *buf)
{
grub_scsi_t scsi;
@ -730,31 +724,18 @@ grub_scsi_write (grub_disk_t disk __attribute((unused)),
if (scsi->devtype == grub_scsi_devtype_cdrom)
return grub_error (GRUB_ERR_IO, N_("cannot write to CD-ROM"));
while (size)
grub_err_t err;
/* Depending on the type, select a read function. */
switch (scsi->devtype)
{
/* PATA doesn't support more than 32K reads.
Not sure about AHCI and USB. If it's confirmed that either of
them can do bigger reads reliably this value can be moved to 'scsi'
structure. */
grub_size_t len = 32768 >> disk->log_sector_size;
grub_err_t err;
if (len > size)
len = size;
/* Depending on the type, select a read function. */
switch (scsi->devtype)
{
case grub_scsi_devtype_direct:
if (sector >> 32)
err = grub_scsi_write16 (disk, sector, len, buf);
else
err = grub_scsi_write10 (disk, sector, len, buf);
if (err)
return err;
break;
}
size -= len;
sector += len;
buf += len << disk->log_sector_size;
case grub_scsi_devtype_direct:
if (sector >> 32)
err = grub_scsi_write16 (disk, sector, size, buf);
else
err = grub_scsi_write10 (disk, sector, size, buf);
if (err)
return err;
break;
}
return GRUB_ERR_NONE;