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Allow raw_read_mda_header to be called from text_label.c.

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We'd like to pass in mda_header to vgname_from_mda().  In order to
do this, we need to call raw_read_mda_header() from text_label.c,
_text_read(), which gets called from the label_read() path, and
peers into the metadata and update vginfo cache.  We should check
the disable bit here, and if set, not peer into the vg metadata,
thus reducing the I/O to disk.

In the process, move vgname_from_mda() to layout.h, since the fn
only gets called from format_text code, and we need the mda_header
definition from the private layout.h.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
This commit is contained in:
Dave Wysochanski 2010-06-28 20:31:01 +00:00
parent da0b4d8770
commit 09e0f43ba0
4 changed files with 44 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
lib/format_text/format-text.c
View File

@ -37,9 +37,6 @@
#include <dirent.h>
#include <ctype.h>
static struct mda_header *_raw_read_mda_header(const struct format_type *fmt,
struct device_area *dev_area);
static struct format_instance *_text_create_text_instance(const struct format_type
*fmt, const char *vgname,
const char *vgid,
@ -181,7 +178,7 @@ static int _pv_analyze_mda_raw (const struct format_type * fmt,
if (!dev_open(area->dev))
return_0;
if (!(mdah = _raw_read_mda_header(fmt, area)))
if (!(mdah = raw_read_mda_header(fmt, area)))
goto_out;
rlocn = mdah->raw_locns;
@ -308,8 +305,8 @@ static void _xlate_mdah(struct mda_header *mdah)
}
}
static struct mda_header *_raw_read_mda_header(const struct format_type *fmt,
struct device_area *dev_area)
struct mda_header *raw_read_mda_header(const struct format_type *fmt,
struct device_area *dev_area)
{
struct mda_header *mdah;
@ -459,7 +456,7 @@ static int _raw_holds_vgname(struct format_instance *fid,
if (!dev_open(dev_area->dev))
return_0;
if (!(mdah = _raw_read_mda_header(fid->fmt, dev_area)))
if (!(mdah = raw_read_mda_header(fid->fmt, dev_area)))
return_0;
if (_find_vg_rlocn(dev_area, mdah, vgname, &noprecommit))
@ -483,7 +480,7 @@ static struct volume_group *_vg_read_raw_area(struct format_instance *fid,
char *desc;
uint32_t wrap = 0;
if (!(mdah = _raw_read_mda_header(fid->fmt, area)))
if (!(mdah = raw_read_mda_header(fid->fmt, area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(area, mdah, vgname, &precommitted))) {
@ -583,7 +580,7 @@ static int _vg_write_raw(struct format_instance *fid, struct volume_group *vg,
if (!dev_open(mdac->area.dev))
return_0;
if (!(mdah = _raw_read_mda_header(fid->fmt, &mdac->area)))
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
rlocn = _find_vg_rlocn(&mdac->area, mdah,
@ -689,7 +686,7 @@ static int _vg_commit_raw_rlocn(struct format_instance *fid,
if (!found)
return 1;
if (!(mdah = _raw_read_mda_header(fid->fmt, &mdac->area)))
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah,
@ -800,7 +797,7 @@ static int _vg_remove_raw(struct format_instance *fid, struct volume_group *vg,
if (!dev_open(mdac->area.dev))
return_0;
if (!(mdah = _raw_read_mda_header(fid->fmt, &mdac->area)))
if (!(mdah = raw_read_mda_header(fid->fmt, &mdac->area)))
goto_out;
if (!(rlocn = _find_vg_rlocn(&mdac->area, mdah, vg->name, &noprecommit))) {
@ -1083,12 +1080,12 @@ static int _scan_file(const struct format_type *fmt)
}
const char *vgname_from_mda(const struct format_type *fmt,
struct mda_header *mdah,
struct device_area *dev_area, struct id *vgid,
uint64_t *vgstatus, char **creation_host,
uint64_t *mda_free_sectors)
{
struct raw_locn *rlocn;
struct mda_header *mdah;
uint32_t wrap = 0;
const char *vgname = NULL;
unsigned int len = 0;
@ -1099,8 +1096,10 @@ const char *vgname_from_mda(const struct format_type *fmt,
if (mda_free_sectors)
*mda_free_sectors = ((dev_area->size - MDA_HEADER_SIZE) / 2) >> SECTOR_SHIFT;
if (!(mdah = _raw_read_mda_header(fmt, dev_area)))
if (!mdah) {
log_error(INTERNAL_ERROR "vgname_from_mda called with NULL pointer for mda_header");
goto_out;
}
/* FIXME Cope with returning a list */
rlocn = mdah->raw_locns;
@ -1188,6 +1187,7 @@ static int _scan_raw(const struct format_type *fmt)
struct format_instance fid;
struct id vgid;
uint64_t vgstatus;
struct mda_header *mdah;
raw_list = &((struct mda_lists *) fmt->private)->raws;
@ -1201,13 +1201,20 @@ static int _scan_raw(const struct format_type *fmt)
continue;
}
if ((vgname = vgname_from_mda(fmt, &rl->dev_area, &vgid, &vgstatus,
if (!(mdah = raw_read_mda_header(fmt, &rl->dev_area))) {
stack;
goto close_dev;
}
if ((vgname = vgname_from_mda(fmt, mdah,
&rl->dev_area, &vgid, &vgstatus,
NULL, NULL))) {
vg = _vg_read_raw_area(&fid, vgname, &rl->dev_area, 0);
if (vg)
lvmcache_update_vg(vg, 0);
}
close_dev:
if (!dev_close(rl->dev_area.dev))
stack;
}

5
lib/format_text/format-text.h
View File

@ -59,9 +59,4 @@ int add_mda(const struct format_type *fmt, struct dm_pool *mem, struct dm_list *
struct device *dev, uint64_t start, uint64_t size);
void del_mdas(struct dm_list *mdas);
const char *vgname_from_mda(const struct format_type *fmt,
struct device_area *dev_area, struct id *vgid,
uint64_t *vgstatus, char **creation_host,
uint64_t *mda_free_sectors);
#endif

10
lib/format_text/layout.h
View File

@ -76,6 +76,9 @@ struct mda_header {
struct raw_locn raw_locns[0]; /* NULL-terminated list */
} __attribute__ ((packed));
struct mda_header *raw_read_mda_header(const struct format_type *fmt,
struct device_area *dev_area);
struct mda_lists {
struct dm_list dirs;
struct dm_list raws;
@ -96,4 +99,11 @@ struct mda_context {
#define LVM2_LABEL "LVM2 001"
#define MDA_SIZE_MIN (8 * (unsigned) lvm_getpagesize())
const char *vgname_from_mda(const struct format_type *fmt,
struct mda_header *mdah,
struct device_area *dev_area, struct id *vgid,
uint64_t *vgstatus, char **creation_host,
uint64_t *mda_free_sectors);
#endif

15
lib/format_text/text_label.c
View File

@ -262,6 +262,7 @@ static int _text_read(struct labeller *l, struct device *dev, void *buf,
const char *vgname;
uint64_t vgstatus;
char *creation_host;
struct mda_header *mdah;
pvhdr = (struct pv_header *) ((void *) buf + xlate32(lh->offset_xl));
@ -303,13 +304,23 @@ static int _text_read(struct labeller *l, struct device *dev, void *buf,
stack;
continue;
}
if ((vgname = vgname_from_mda(info->fmt, &mdac->area,
if (!(mdah = raw_read_mda_header(info->fmt, &mdac->area))) {
stack;
goto close_dev;
}
if ((vgname = vgname_from_mda(info->fmt, mdah,
&mdac->area,
&vgid, &vgstatus, &creation_host,
&mdac->free_sectors)) &&
!lvmcache_update_vgname_and_id(info, vgname,
(char *) &vgid, vgstatus,
creation_host))
creation_host)) {
if (!dev_close(mdac->area.dev))
stack;
return_0;
}
close_dev:
if (!dev_close(mdac->area.dev))
stack;
}