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[Iscsitarget-devel] [PATCH 2/3] user definable SCSI level block size
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From: Lars E. <lar...@li...> - 2010-02-27 12:04:29
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Add a per LUN BlockSize parameter, defaulting to 512,
which allows us to specify the SCSI level block size.
This also renames the nullio Sectors=<size> to BlockCount=<count>,
keeping the Sectors= as compat alias around.
As it is not sectors now any more, but scsi block count,
now that we can specify the block size.
Finally, it adds " blocks:%llu blocksize:%u"
it iet_volume_info_show, which made
nullio_data and nullio_show, obsolete.
This can be used as a testbed for testing initiator io stack
robustness for block size != 512, without actually having access
to a physical drive or array with these properties.
It also allows us better performance on disks and arrays
with "physical" block size of 4k and "logical" block size
of 512 byte -- which do the read-modify-write cycle internally
in firmware for block sizes != 4k.
Finally it makes iet usable on top of disks and arrays
with both logical and physical block size != 512,
which will be shipping soon enough.
Signed-off-by: Lars Ellenberg <lar...@li...>
---
Makefile | 5 +++++
dkms.conf | 43 +++++++++++++++++++++++--------------------
doc/manpages/ietd.conf.5 | 16 +++++++++++++---
kernel/block-io.c | 13 +++++++++++--
kernel/file-io.c | 2 +-
kernel/iscsi.h | 2 --
kernel/null-io.c | 41 ++++++++++++-----------------------------
kernel/volume.c | 24 ++++++++++++++++++++++++
patches/compat-2.6.30.patch | 12 ++++++++++++
9 files changed, 101 insertions(+), 57 deletions(-)
create mode 100644 patches/compat-2.6.30.patch
diff --git a/Makefile b/Makefile
index 0b94f89..f88a2fc 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,11 @@ ifeq ($(call kver_le,2,6,31),1)
PATCHES := $(PATCHES) compat-2.6.31.patch
endif
+# Compatibility patch for kernels <= 2.6.30
+ifeq ($(call kver_le,2,6,30),1)
+ PATCHES := $(PATCHES) compat-2.6.30.patch
+endif
+
# Compatibility patch for kernels <= 2.6.29
ifeq ($(call kver_le,2,6,29),1)
PATCHES := $(PATCHES) compat-2.6.29.patch
diff --git a/dkms.conf b/dkms.conf
index f67226c..51c0e90 100644
--- a/dkms.conf
+++ b/dkms.conf
@@ -23,33 +23,36 @@ AUTOINSTALL="yes"
PATCH[0]="compat-2.6.31.patch"
PATCH_MATCH[0]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31)"
-PATCH[1]="compat-2.6.29.patch"
-PATCH_MATCH[1]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29)"
+PATCH[1]="compat-2.6.30.patch"
+PATCH_MATCH[1]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29|30)"
-PATCH[2]="compat-2.6.28.patch"
-PATCH_MATCH[2]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28)"
+PATCH[2]="compat-2.6.29.patch"
+PATCH_MATCH[2]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28|29)"
-PATCH[3]="compat-2.6.25-2.6.27.patch"
-PATCH_MATCH[3]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27)"
+PATCH[3]="compat-2.6.28.patch"
+PATCH_MATCH[3]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28)"
-PATCH[4]="compat-2.6.24.patch"
-PATCH_MATCH[4]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24)"
+PATCH[4]="compat-2.6.25-2.6.27.patch"
+PATCH_MATCH[4]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24|25|26|27)"
-PATCH[5]="compat-2.6.23.patch"
-PATCH_MATCH[5]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23)"
+PATCH[5]="compat-2.6.24.patch"
+PATCH_MATCH[5]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23|24)"
-PATCH[6]="compat-2.6.22.patch"
-PATCH_MATCH[6]="2\.6\.(9|14|15|16|17|18|19|20|21|22)"
+PATCH[6]="compat-2.6.23.patch"
+PATCH_MATCH[6]="2\.6\.(9|14|15|16|17|18|19|20|21|22|23)"
-PATCH[7]="compat-2.6.19-2.6.21.patch"
-PATCH_MATCH[7]="2\.6\.(9|14|15|16|17|18|19|20|21)"
+PATCH[7]="compat-2.6.22.patch"
+PATCH_MATCH[7]="2\.6\.(9|14|15|16|17|18|19|20|21|22)"
-PATCH[8]="compat-2.6.14-2.6.18.patch"
-PATCH_MATCH[8]="2\.6\.(9|14|15|16|17|18)"
+PATCH[8]="compat-2.6.19-2.6.21.patch"
+PATCH_MATCH[8]="2\.6\.(9|14|15|16|17|18|19|20|21)"
-PATCH[9]="compat-sles10sp2.patch"
-PATCH_MATCH[9]="2\.6\.16\.60-.*"
+PATCH[9]="compat-2.6.14-2.6.18.patch"
+PATCH_MATCH[9]="2\.6\.(9|14|15|16|17|18)"
-PATCH[10]="compat-rhel4.patch"
-PATCH_MATCH[10]="2\.6\.9-.*\.(el|plus\.c4)"
+PATCH[10]="compat-sles10sp2.patch"
+PATCH_MATCH[10]="2\.6\.16\.60-.*"
+
+PATCH[11]="compat-rhel4.patch"
+PATCH_MATCH[11]="2\.6\.9-.*\.(el|plus\.c4)"
diff --git a/doc/manpages/ietd.conf.5 b/doc/manpages/ietd.conf.5
index f5f9d6d..910b9fc 100644
--- a/doc/manpages/ietd.conf.5
+++ b/doc/manpages/ietd.conf.5
@@ -27,7 +27,7 @@ Target iqn.2001\-04.com.example:storage.disk2.sys1.xyz
IncomingUser jim othersecret
OutgoingUser james yetanothersecret
Lun 0 Path=/dev/sdc,Type=fileio
- Lun 1 Sectors=10000,Type=nullio
+ Lun 1 BlockCount=10000,BlockSize=4096,Type=nullio
Alias Test
HeaderDigest None
DataDigest None
@@ -127,7 +127,7 @@ has to be provided, if there is a
.I <username>
given.
.TP
-.B Lun <lun> Path=<device>,Type=(fileio|blockio)[,ScsiId=<scsi_id>][,ScsiSN=<scsi_sn>][,IOMode=(wb|ro)] | Sectors=<size>,Type=nullio
+.B Lun <lun> Path=<device>,Type=(fileio|blockio)[,ScsiId=<scsi_id>][,ScsiSN=<scsi_sn>][,IOMode=(wb|ro|wt)][,BlockSize=<size>] | Type=nullio,BlockCount=<count>,BlockSize=<size>
Parameters after <lun> should not contain any blank space character except the first blank space after <lun> is needed.
.br
@@ -185,13 +185,23 @@ NOTE:
.br
.br
+You can specify a logical block
+.I <size>
+of the iSCSI volume. This size must be 512 or greater and must be a power of 2 (512,1024,2048,4096...).
+If BlockSize isn't specified the default is 512 bytes for fileio, and the logical block size of the
+lower level device for blockio (which typically is 512 Byte as well, still).
+.br
+
+.br
In
.I nullio
mode, it defines a mapping between a "Logical Unit Number"
.I <lun>
and an unnamed virtual device with
+.I <count>
+blocks of
.I <size>
-sectors. This is ONLY useful for performance measurement purposes. All writes to this virtual device will be discarded and reads will return random data.
+bytes. This is ONLY useful for performance measurement purposes. All writes to this virtual device will be discarded and reads will return random data.
.TP
.B [Alias <aliasname>]
This assigns an optional
diff --git a/kernel/block-io.c b/kernel/block-io.c
index 708f101..2e6cf8b 100644
--- a/kernel/block-io.c
+++ b/kernel/block-io.c
@@ -86,7 +86,8 @@ blockio_make_request(struct iet_volume *volume, struct tio *tio, int rw)
goto out;
}
- bio->bi_sector = ppos >> volume->blk_shift;
+ /* bi_sector is always in units of 512 byte */
+ bio->bi_sector = ppos >> 9;
bio->bi_bdev = bio_data->bdev;
bio->bi_end_io = blockio_bio_endio;
bio->bi_private = tio_work;
@@ -167,6 +168,14 @@ blockio_open_path(struct iet_volume *volume, const char *path)
eprintk("Can't open device %s, error %d\n", path, err);
bio_data->bdev = NULL;
} else {
+ /* see Documentation/ABI/testing/sysfs-block */
+ unsigned bsz = queue_logical_block_size(bdev_get_queue(bdev));
+ unsigned bshift = ilog2(bsz);
+ if (volume->blk_shift < bshift) {
+ iprintk("Target %s, LUN %u: overriding block size to %u\n",
+ volume->target->name, volume->lun, bsz);
+ volume->blk_shift = bshift;
+ }
bio_data->bdev = bdev;
fsync_bdev(bio_data->bdev);
}
@@ -244,6 +253,7 @@ static match_table_t tokens = {
{Opt_path, "Path=%s"},
{Opt_ignore, "Type=%s"},
{Opt_ignore, "IOMode=%s"},
+ {Opt_ignore, "BlockSize=%s"},
{Opt_err, NULL},
};
@@ -363,7 +373,6 @@ blockio_attach(struct iet_volume *volume, char *args)
ClearLURCache(volume);
ClearLUWCache(volume);
- volume->blk_shift = SECTOR_SIZE_BITS;
volume->blk_cnt = bio_data->bdev->bd_inode->i_size >> volume->blk_shift;
out:
diff --git a/kernel/file-io.c b/kernel/file-io.c
index fa8d42a..d3657fd 100644
--- a/kernel/file-io.c
+++ b/kernel/file-io.c
@@ -181,6 +181,7 @@ static match_table_t tokens = {
{Opt_path, "Path=%s"},
{Opt_ignore, "Type=%s"},
{Opt_ignore, "IOMode=%s"},
+ {Opt_ignore, "BlockSize=%s"},
{Opt_err, NULL},
};
@@ -297,7 +298,6 @@ static int fileio_attach(struct iet_volume *lu, char *args)
goto out;
}
- lu->blk_shift = SECTOR_SIZE_BITS;
lu->blk_cnt = inode->i_size >> lu->blk_shift;
/* we're using the page cache */
diff --git a/kernel/iscsi.h b/kernel/iscsi.h
index 1b6397f..ce7c13e 100644
--- a/kernel/iscsi.h
+++ b/kernel/iscsi.h
@@ -462,8 +462,6 @@ static inline void iscsi_cmnd_set_length(struct iscsi_pdu *pdu)
#define cmnd_opcode(cmnd) ((cmnd)->pdu.bhs.opcode & ISCSI_OPCODE_MASK)
#define cmnd_scsicode(cmnd) cmnd_hdr(cmnd)->scb[0]
-#define SECTOR_SIZE_BITS 9
-
enum cmnd_flags {
CMND_hashed,
CMND_queued,
diff --git a/kernel/null-io.c b/kernel/null-io.c
index cfa5899..17f2480 100644
--- a/kernel/null-io.c
+++ b/kernel/null-io.c
@@ -16,16 +16,17 @@
#include "iscsi_dbg.h"
#include "iotype.h"
-struct nullio_data {
- u64 sectors;
-};
-
enum {
- Opt_sectors, Opt_ignore, Opt_err,
+ Opt_blk_cnt, Opt_ignore, Opt_err,
};
static match_table_t tokens = {
- {Opt_sectors, "Sectors=%u"},
+ /* alias for compatibility with existing setups and documentation */
+ {Opt_blk_cnt, "Sectors=%u"},
+ /* but actually it is the scsi block count, now that we can
+ * specify the block size. */
+ {Opt_blk_cnt, "BlockCount=%u"},
+ {Opt_ignore, "BlockSize=%s"},
{Opt_ignore, "Type=%s"},
{Opt_err, NULL},
};
@@ -34,7 +35,6 @@ static int parse_nullio_params(struct iet_volume *volume, char *params)
{
int err = 0;
char *p, *q;
- struct nullio_data *data = volume->private;
while ((p = strsep(¶ms, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
@@ -43,11 +43,11 @@ static int parse_nullio_params(struct iet_volume *volume, char *params)
continue;
token = match_token(p, tokens, args);
switch (token) {
- case Opt_sectors:
+ case Opt_blk_cnt:
q = match_strdup(&args[0]);
if (!q)
return -ENOMEM;
- data->sectors = simple_strtoull(q, NULL, 10);
+ volume->blk_cnt = simple_strtoull(q, NULL, 10);
kfree(q);
break;
case Opt_ignore:
@@ -63,35 +63,25 @@ static int parse_nullio_params(struct iet_volume *volume, char *params)
static void nullio_detach(struct iet_volume *lu)
{
- struct nullio_data *p = lu->private;
-
- kfree(p);
- lu->private = NULL;
}
static int nullio_attach(struct iet_volume *lu, char *args)
{
int err = 0;
- struct nullio_data *p;
if (lu->private) {
printk("already attached ? %d\n", lu->lun);
return -EBUSY;
}
- p = kzalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
-
- lu->private = p;
-
if ((err = parse_nullio_params(lu, args)) < 0) {
eprintk("%d\n", err);
goto out;
}
- lu->blk_shift = SECTOR_SIZE_BITS;
- lu->blk_cnt = (p->sectors = p->sectors ? : 1 << 27); /* 64 GB */
+ /* >= 64 GiB depending on block size */
+ if (!lu->blk_cnt)
+ lu->blk_cnt = 1 << 27;
out:
if (err < 0)
@@ -99,16 +89,9 @@ out:
return err;
}
-void nullio_show(struct iet_volume *lu, struct seq_file *seq)
-{
- struct nullio_data *p = lu->private;
- seq_printf(seq, " sectors:%llu\n", p->sectors);
-}
-
struct iotype nullio =
{
.name = "nullio",
.attach = nullio_attach,
.detach = nullio_detach,
- .show = nullio_show,
};
diff --git a/kernel/volume.c b/kernel/volume.c
index 820a58a..17dae4c 100644
--- a/kernel/volume.c
+++ b/kernel/volume.c
@@ -6,6 +6,7 @@
#include <linux/types.h>
#include <linux/parser.h>
+#include <linux/log2.h>
#include "iscsi.h"
#include "iscsi_dbg.h"
@@ -25,18 +26,21 @@ struct iet_volume *volume_lookup(struct iscsi_target *target, u32 lun)
enum {
Opt_type,
Opt_iomode,
+ Opt_blk_size,
Opt_err,
};
static match_table_t tokens = {
{Opt_type, "Type=%s"},
{Opt_iomode, "IOMode=%s"},
+ {Opt_blk_size, "BlockSize=%u"},
{Opt_err, NULL},
};
static int set_iotype(struct iet_volume *volume, char *params)
{
int err = 0;
+ unsigned blk_sz;
substring_t args[MAX_OPT_ARGS];
char *p, *argp = NULL, *buf = (char *) get_zeroed_page(GFP_USER);
@@ -44,6 +48,9 @@ static int set_iotype(struct iet_volume *volume, char *params)
return -ENOMEM;
strncpy(buf, params, PAGE_CACHE_SIZE);
+ /* assume 512 byte block size by default */
+ volume->blk_shift = 9;
+
while ((p = strsep(&buf, ",")) != NULL) {
int token;
@@ -67,6 +74,21 @@ static int set_iotype(struct iet_volume *volume, char *params)
SetLUWCache(volume);
kfree(argp);
break;
+ case Opt_blk_size:
+ argp = match_strdup(&args[0]);
+ if (!argp) {
+ err = -ENOMEM;
+ break;
+ }
+ blk_sz = simple_strtoull(argp, NULL, 10);
+ if (512 <= blk_sz && blk_sz <= (64 << 10) && is_power_of_2(blk_sz))
+ volume->blk_shift = ilog2(blk_sz);
+ else {
+ eprintk("invalid BlockSize=%u\n", blk_sz);
+ err = -EINVAL;
+ }
+ kfree(argp);
+ break;
default:
break;
}
@@ -257,6 +279,8 @@ static void iet_volume_info_show(struct seq_file *seq, struct iscsi_target *targ
else
seq_printf(seq, " iomode:wt");
+ seq_printf(seq, " blocks:%llu blocksize:%u",
+ volume->blk_cnt, 1 << volume->blk_shift);
if (volume->iotype->show)
volume->iotype->show(volume, seq);
else
diff --git a/patches/compat-2.6.30.patch b/patches/compat-2.6.30.patch
new file mode 100644
index 0000000..1d2e557
--- /dev/null
+++ b/patches/compat-2.6.30.patch
@@ -0,0 +1,12 @@
+diff -u kernel/block-io.c kernel/block-io.c
+--- a/kernel/block-io.c (working copy)
++++ b/kernel/block-io.c (working copy)
+@@ -169,7 +169,7 @@
+ bio_data->bdev = NULL;
+ } else {
+ /* see Documentation/ABI/testing/sysfs-block */
+- unsigned bsz = queue_logical_block_size(bdev_get_queue(bdev));
++ unsigned bsz = queue_hardsect_size(bdev_get_queue(bdev));
+ unsigned bshift = ilog2(bsz);
+ if (volume->blk_shift < bshift) {
+ iprintk("Target %s, LUN %u: overriding block size to %u\n",
--
1.6.3.3
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