[lvm-devel] [PATCH 1/6] Add --dataalignmentoffset to pvcreate to shift start of aligned data area
Mike Snitzer
snitzer at redhat.com
Sat Jul 25 22:14:51 UTC 2009
Implement pvcreate --dataalignmentoffset to shift the start of
the aligned data area.
Adds pe_align_offset to 'struct physical_volume'; is initialized with
set_pe_align_offset(). After pe_start is established pe_align_offset is
added to it.
Signed-off-by: Mike Snitzer <snitzer at redhat.com>
---
WHATS_NEW | 1 +
lib/format1/format1.c | 1 +
lib/format_pool/format_pool.c | 1 +
lib/format_text/archiver.c | 2 +-
lib/format_text/format-text.c | 17 ++++++++++++++++-
lib/metadata/metadata-exported.h | 2 ++
lib/metadata/metadata.c | 30 ++++++++++++++++++++++++++++--
lib/metadata/metadata.h | 3 +++
man/pvcreate.8.in | 20 +++++++++++++++++---
tools/args.h | 1 +
tools/commands.h | 7 ++++---
tools/pvcreate.c | 23 +++++++++++++++++++++--
tools/vgconvert.c | 2 +-
13 files changed, 97 insertions(+), 13 deletions(-)
Index: LVM2/WHATS_NEW
===================================================================
--- LVM2.orig/WHATS_NEW
+++ LVM2/WHATS_NEW
@@ -1,5 +1,6 @@
Version 2.02.50 -
================================
+ Add --dataalignmentoffset to pvcreate to shift start of aligned data area.
Add global/wait_for_locks to lvm.conf so blocking for locks can be disabled.
All LV locks are non-blocking so remove LCK_NONBLOCK from separate macros.
Fix race condition with vgcreate and vgextend on same device (2.02.49).
Index: LVM2/lib/format1/format1.c
===================================================================
--- LVM2.orig/lib/format1/format1.c
+++ LVM2/lib/format1/format1.c
@@ -296,6 +296,7 @@ static int _format1_pv_setup(const struc
uint64_t pe_start, uint32_t extent_count,
uint32_t extent_size,
unsigned long data_alignment __attribute((unused)),
+ unsigned long data_alignment_offset __attribute((unused)),
int pvmetadatacopies __attribute((unused)),
uint64_t pvmetadatasize __attribute((unused)), struct dm_list *mdas __attribute((unused)),
struct physical_volume *pv, struct volume_group *vg __attribute((unused)))
Index: LVM2/lib/format_pool/format_pool.c
===================================================================
--- LVM2.orig/lib/format_pool/format_pool.c
+++ LVM2/lib/format_pool/format_pool.c
@@ -192,6 +192,7 @@ static int _pool_pv_setup(const struct f
uint32_t extent_count __attribute((unused)),
uint32_t extent_size __attribute((unused)),
unsigned long data_alignment __attribute((unused)),
+ unsigned long data_alignment_offset __attribute((unused)),
int pvmetadatacopies __attribute((unused)),
uint64_t pvmetadatasize __attribute((unused)),
struct dm_list *mdas __attribute((unused)),
Index: LVM2/lib/format_text/archiver.c
===================================================================
--- LVM2.orig/lib/format_text/archiver.c
+++ LVM2/lib/format_text/archiver.c
@@ -320,7 +320,7 @@ int backup_restore_vg(struct cmd_context
return 0;
}
if (!vg->fid->fmt->ops->
- pv_setup(vg->fid->fmt, UINT64_C(0), 0, 0, 0, 0UL,
+ pv_setup(vg->fid->fmt, UINT64_C(0), 0, 0, 0, 0, 0UL,
UINT64_C(0), &vg->fid->metadata_areas, pv, vg)) {
log_error("Format-specific setup for %s failed",
pv_dev_name(pv));
Index: LVM2/lib/format_text/format-text.c
===================================================================
--- LVM2.orig/lib/format_text/format-text.c
+++ LVM2/lib/format_text/format-text.c
@@ -1382,8 +1382,16 @@ static int _text_pv_write(const struct f
adjustment = pv->pe_start % pv->pe_align;
if (adjustment)
pv->pe_start += pv->pe_align - adjustment;
+ if (pv->pe_align_offset)
+ pv->pe_start += pv->pe_align_offset;
}
}
+ if (pv->pe_start >= pv->size) {
+ log_error("Data area is beyond end of device %s!",
+ pv_dev_name(pv));
+ return 0;
+ }
+
if (!add_da
(NULL, &info->das, pv->pe_start << SECTOR_SHIFT, UINT64_C(0)))
return_0;
@@ -1598,6 +1606,7 @@ static struct metadata_area_ops _metadat
static int _text_pv_setup(const struct format_type *fmt,
uint64_t pe_start, uint32_t extent_count,
uint32_t extent_size, unsigned long data_alignment,
+ unsigned long data_alignment_offset,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list *mdas,
struct physical_volume *pv, struct volume_group *vg)
@@ -1702,8 +1711,14 @@ static int _text_pv_setup(const struct f
"%lu sectors (requested %lu sectors)",
pv_dev_name(pv), pv->pe_align, data_alignment);
- if (pv->pe_start < pv->pe_align)
+ if (!pe_start)
+ set_pe_align_offset(pv, data_alignment_offset);
+
+ if (pv->pe_start < pv->pe_align) {
pv->pe_start = pv->pe_align;
+ if (pv->pe_align_offset)
+ pv->pe_start += pv->pe_align_offset;
+ }
if (extent_count)
pe_end = pe_start + extent_count * extent_size - 1;
Index: LVM2/lib/metadata/metadata-exported.h
===================================================================
--- LVM2.orig/lib/metadata/metadata-exported.h
+++ LVM2/lib/metadata/metadata-exported.h
@@ -184,6 +184,7 @@ struct physical_volume {
uint32_t pe_count;
uint32_t pe_alloc_count;
unsigned long pe_align;
+ unsigned long pe_align_offset;
struct dm_list segments; /* Ordered pv_segments covering complete PV */
struct dm_list tags;
@@ -398,6 +399,7 @@ pv_t *pv_create(const struct cmd_context
struct id *id,
uint64_t size,
unsigned long data_alignment,
+ unsigned long data_alignment_offset,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
Index: LVM2/lib/metadata/metadata.c
===================================================================
--- LVM2.orig/lib/metadata/metadata.c
+++ LVM2/lib/metadata/metadata.c
@@ -48,6 +48,7 @@ static struct physical_volume *_pv_creat
struct device *dev,
struct id *id, uint64_t size,
unsigned long data_alignment,
+ unsigned long data_alignment_offset,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
@@ -102,6 +103,25 @@ out:
return pv->pe_align;
}
+unsigned long set_pe_align_offset(struct physical_volume *pv,
+ unsigned long data_alignment_offset)
+{
+ if (pv->pe_align_offset)
+ goto out;
+
+ if (data_alignment_offset)
+ pv->pe_align_offset = data_alignment_offset;
+
+ if (!pv->dev)
+ goto out;
+
+ log_very_verbose("%s: Setting PE alignment offset to %lu sectors.",
+ dev_name(pv->dev), pv->pe_align_offset);
+
+out:
+ return pv->pe_align_offset;
+}
+
/**
* add_pv_to_vg - Add a physical volume to a volume group
* @vg - volume group to add to
@@ -163,7 +183,7 @@ int add_pv_to_vg(struct volume_group *vg
pv->pe_alloc_count = 0;
if (!fid->fmt->ops->pv_setup(fid->fmt, UINT64_C(0), 0,
- vg->extent_size, 0, 0UL, UINT64_C(0),
+ vg->extent_size, 0, 0, 0UL, UINT64_C(0),
&fid->metadata_areas, pv, vg)) {
log_error("Format-specific setup of physical volume '%s' "
"failed.", pv_name);
@@ -971,6 +991,7 @@ int vg_split_mdas(struct cmd_context *cm
* @id: PV UUID to use for initialization
* @size: size of the PV in sectors
* @data_alignment: requested alignment of data
+ * @data_alignment_offset: requested offset to aligned data
* @pe_start: physical extent start
* @existing_extent_count
* @existing_extent_size
@@ -989,13 +1010,15 @@ pv_t *pv_create(const struct cmd_context
struct device *dev,
struct id *id, uint64_t size,
unsigned long data_alignment,
+ unsigned long data_alignment_offset,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list *mdas)
{
- return _pv_create(cmd->fmt, dev, id, size, data_alignment, pe_start,
+ return _pv_create(cmd->fmt, dev, id, size,
+ data_alignment, data_alignment_offset, pe_start,
existing_extent_count,
existing_extent_size,
pvmetadatacopies,
@@ -1024,6 +1047,7 @@ static struct physical_volume *_alloc_pv
pv->pe_count = 0;
pv->pe_alloc_count = 0;
pv->pe_align = 0;
+ pv->pe_align_offset = 0;
pv->fmt = NULL;
pv->dev = dev;
@@ -1040,6 +1064,7 @@ static struct physical_volume *_pv_creat
struct device *dev,
struct id *id, uint64_t size,
unsigned long data_alignment,
+ unsigned long data_alignment_offset,
uint64_t pe_start,
uint32_t existing_extent_count,
uint32_t existing_extent_size,
@@ -1091,6 +1116,7 @@ static struct physical_volume *_pv_creat
if (!fmt->ops->pv_setup(fmt, pe_start, existing_extent_count,
existing_extent_size, data_alignment,
+ data_alignment_offset,
pvmetadatacopies, pvmetadatasize, mdas,
pv, NULL)) {
log_error("%s: Format-specific setup of physical volume "
Index: LVM2/lib/metadata/metadata.h
===================================================================
--- LVM2.orig/lib/metadata/metadata.h
+++ LVM2/lib/metadata/metadata.h
@@ -213,6 +213,7 @@ struct format_handler {
int (*pv_setup) (const struct format_type * fmt,
uint64_t pe_start, uint32_t extent_count,
uint32_t extent_size, unsigned long data_alignment,
+ unsigned long data_alignment_offset,
int pvmetadatacopies,
uint64_t pvmetadatasize, struct dm_list * mdas,
struct physical_volume * pv, struct volume_group * vg);
@@ -267,6 +268,8 @@ struct format_handler {
* Utility functions
*/
unsigned long set_pe_align(struct physical_volume *pv, unsigned long data_alignment);
+unsigned long set_pe_align_offset(struct physical_volume *pv,
+ unsigned long data_alignment_offset);
int vg_validate(struct volume_group *vg);
int pv_write_orphan(struct cmd_context *cmd, struct physical_volume *pv);
Index: LVM2/man/pvcreate.8.in
===================================================================
--- LVM2.orig/man/pvcreate.8.in
+++ LVM2/man/pvcreate.8.in
@@ -14,6 +14,7 @@ pvcreate \- initialize a disk or partiti
.RB [ \-\-metadatacopies #copies ]
.RB [ \-\-metadatasize size ]
.RB [ \-\-dataalignment alignment ]
+.RB [ \-\-dataalignmentoffset alignment_offset ]
.RB [ \-\-restorefile file ]
.RB [ \-\-setphysicalvolumesize size ]
.RB [ \-u | \-\-uuid uuid ]
@@ -91,13 +92,18 @@ The approximate amount of space to be se
(The size you specify may get rounded.)
.TP
.BR \-\-dataalignment " alignment"
-Align the offset of the start of the data to a multiple of this number.
+Align the start of the data to a multiple of this number.
You should also specify an appropriate \fBPhysicalExtentSize\fP when creating
the Volume Group with \fBvgcreate\fP.
.sp
To see the location of the first Physical Extent of an existing Physical Volume
use \fBpvs -o +pe_start\fP . It will be a multiple of the requested
-\fBdata_alignment\fP.
+\fBalignment\fP. In addition it may be shifted by \fBalignment_offset\fP from
+\fBdata_alignment_offset_detection\fP (if enabled in \fBlvm.conf\fP) or
+\fB--dataalignmentoffset\fP.
+.TP
+.BR \-\-dataalignmentoffset " alignment_offset"
+Shift the start of the data area by this additional \fBalignment_offset\fP.
.TP
.BR \-\-metadatacopies " copies"
The number of metadata areas to set aside on each PV. Currently
@@ -128,13 +134,21 @@ in the source). Use with care.
.TP
.BR \-\-setphysicalvolumesize " size"
Overrides the automatically-detected size of the PV. Use with care.
-.SH Example
+.SH EXAMPLES
Initialize partition #4 on the third SCSI disk and the entire fifth
SCSI disk for later use by LVM:
.sp
.B pvcreate /dev/sdc4 /dev/sde
.sp
+If the 2nd SCSI disk is a 4KB sector drive that compensates for windows
+partitioning (sector 7 is the lowest aligned logical block, the 4KB
+sectors start at LBA -1, and consequently sector 63 is aligned on a 4KB
+boundary) manually account for this when initializing for use by LVM:
+.sp
+.B pvcreate --dataalignmentoffset 7s /dev/sdb
+.sp
.SH SEE ALSO
+.BR lvm.conf (5),
.BR lvm (8),
.BR vgcreate (8),
.BR vgextend (8),
Index: LVM2/tools/args.h
===================================================================
--- LVM2.orig/tools/args.h
+++ LVM2/tools/args.h
@@ -59,6 +59,7 @@ arg(nameprefixes_ARG, '\0', "nameprefixe
arg(unquoted_ARG, '\0', "unquoted", NULL, 0)
arg(rows_ARG, '\0', "rows", NULL, 0)
arg(dataalignment_ARG, '\0', "dataalignment", size_kb_arg, 0)
+arg(dataalignmentoffset_ARG, '\0', "dataalignmentoffset", size_kb_arg, 0)
arg(virtualoriginsize_ARG, '\0', "virtualoriginsize", size_mb_arg, 0)
arg(virtualsize_ARG, '\0', "virtualsize", size_mb_arg, 0)
Index: LVM2/tools/commands.h
===================================================================
--- LVM2.orig/tools/commands.h
+++ LVM2/tools/commands.h
@@ -470,6 +470,7 @@ xx(pvcreate,
"\t[--metadatacopies #copies]" "\n"
"\t[--metadatasize MetadataSize[bBsSkKmMgGtTpPeE]]" "\n"
"\t[--dataalignment Alignment[bBsSkKmMgGtTpPeE]]" "\n"
+ "\t[--dataalignmentoffset AlignmentOffset[bBsSkKmMgGtTpPeE]]" "\n"
"\t[--setphysicalvolumesize PhysicalVolumeSize[bBsSkKmMgGtTpPeE]" "\n"
"\t[-t|--test] " "\n"
"\t[-u|--uuid uuid] " "\n"
@@ -479,9 +480,9 @@ xx(pvcreate,
"\t[--version] " "\n"
"\tPhysicalVolume [PhysicalVolume...]\n",
- dataalignment_ARG, force_ARG, test_ARG, labelsector_ARG, metadatatype_ARG,
- metadatacopies_ARG, metadatasize_ARG, physicalvolumesize_ARG,
- restorefile_ARG, uuidstr_ARG, yes_ARG, zero_ARG)
+ dataalignment_ARG, dataalignmentoffset_ARG, force_ARG, test_ARG,
+ labelsector_ARG, metadatatype_ARG, metadatacopies_ARG, metadatasize_ARG,
+ physicalvolumesize_ARG, restorefile_ARG, uuidstr_ARG, yes_ARG, zero_ARG)
xx(pvdata,
"Display the on-disk metadata for physical volume(s)",
Index: LVM2/tools/pvcreate.c
===================================================================
--- LVM2.orig/tools/pvcreate.c
+++ LVM2/tools/pvcreate.c
@@ -20,6 +20,7 @@ struct pvcreate_params {
int zero;
uint64_t size;
uint64_t data_alignment;
+ uint64_t data_alignment_offset;
int pvmetadatacopies;
uint64_t pvmetadatasize;
int64_t labelsector;
@@ -203,8 +204,8 @@ static int pvcreate_single(struct cmd_co
dm_list_init(&mdas);
if (!(pv = pv_create(cmd, dev, pp->idp, pp->size,
- pp->data_alignment, pp->pe_start,
- pp->extent_count, pp->extent_size,
+ pp->data_alignment, pp->data_alignment_offset,
+ pp->pe_start, pp->extent_count, pp->extent_size,
pp->pvmetadatacopies,
pp->pvmetadatasize,&mdas))) {
log_error("Failed to setup physical volume \"%s\"", pv_name);
@@ -377,6 +378,24 @@ static int pvcreate_validate_params(stru
pp->data_alignment = 0;
}
+ if (arg_sign_value(cmd, dataalignmentoffset_ARG, 0) == SIGN_MINUS) {
+ log_error("Physical volume data alignment offset may not be negative");
+ return 0;
+ }
+ pp->data_alignment_offset = arg_uint64_value(cmd, dataalignmentoffset_ARG, UINT64_C(0));
+
+ if (pp->data_alignment_offset > ULONG_MAX) {
+ log_error("Physical volume data alignment offset is too big.");
+ return 0;
+ }
+
+ if (pp->data_alignment_offset && pp->pe_start) {
+ log_warn("WARNING: Ignoring data alignment offset %" PRIu64
+ " incompatible with --restorefile value (%"
+ PRIu64").", pp->data_alignment_offset, pp->pe_start);
+ pp->data_alignment_offset = 0;
+ }
+
if (arg_sign_value(cmd, metadatasize_ARG, 0) == SIGN_MINUS) {
log_error("Metadata size may not be negative");
return 0;
Index: LVM2/tools/vgconvert.c
===================================================================
--- LVM2.orig/tools/vgconvert.c
+++ LVM2/tools/vgconvert.c
@@ -123,7 +123,7 @@ static int vgconvert_single(struct cmd_c
dm_list_init(&mdas);
if (!(pv = pv_create(cmd, pv_dev(existing_pv),
- &existing_pv->id, size, 0,
+ &existing_pv->id, size, 0, 0,
pe_start, pv_pe_count(existing_pv),
pv_pe_size(existing_pv), pvmetadatacopies,
pvmetadatasize, &mdas))) {
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