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Only do one full device scan during each read of text format metadata.

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This commit is contained in:
Alasdair Kergon 2010-03-16 17:30:00 +00:00
parent 38220f9fe9
commit b1f9a2f5d1
6 changed files with 19 additions and 11 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.63 -
================================
Only do one full device scan during each read of text format metadata.
Remove unnecessary full_scan parameter from get_vgids and get_vgnames calls.
Look up missing PVs by uuid not dev_name in _pvs_single to avoid invalid stat.
Make find_pv_in_vg_by_uuid() return same type as related functions.

6
lib/cache/lvmcache.c vendored
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@ -703,7 +703,8 @@ struct dm_list *lvmcache_get_pvids(struct cmd_context *cmd, const char *vgname,
return pvids;
}
struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid)
struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid,
int *scan_done_once)
{
struct label *label;
struct lvmcache_info *info;
@ -728,10 +729,11 @@ struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid)
}
}
if (memlock())
if (memlock() || (scan_done_once && *scan_done_once))
return NULL;
lvmcache_label_scan(cmd, 2);
*scan_done_once = 1;
/* Try again */
if ((info = info_from_pvid((char *) pvid, 0))) {

3
lib/cache/lvmcache.h vendored
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@ -93,7 +93,8 @@ struct lvmcache_vginfo *vginfo_from_vgname(const char *vgname,
struct lvmcache_vginfo *vginfo_from_vgid(const char *vgid);
struct lvmcache_info *info_from_pvid(const char *pvid, int valid_only);
const char *vgname_from_vgid(struct dm_pool *mem, const char *vgid);
struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid);
struct device *device_from_pvid(struct cmd_context *cmd, struct id *pvid,
int *scan_done_once);
int vgs_locked(void);
int vgname_is_locked(const char *vgname);

2
lib/format_text/format-text.c
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@ -2025,7 +2025,7 @@ static int _get_config_disk_area(struct cmd_context *cmd,
return 0;
}
if (!(dev_area.dev = device_from_pvid(cmd, &id))) {
if (!(dev_area.dev = device_from_pvid(cmd, &id, NULL))) {
char buffer[64] __attribute((aligned(8)));
if (!id_write_format(&id, buffer, sizeof(buffer)))

16
lib/format_text/import_vsn1.c
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@ -27,7 +27,8 @@
typedef int (*section_fn) (struct format_instance * fid, struct dm_pool * mem,
struct volume_group * vg, struct config_node * pvn,
struct config_node * vgn,
struct dm_hash_table * pv_hash);
struct dm_hash_table * pv_hash,
int *scan_done_once);
#define _read_int32(root, path, result) \
get_config_uint32(root, path, (uint32_t *) result)
@ -153,7 +154,7 @@ static int _read_flag_config(struct config_node *n, uint64_t *status, int type)
static int _read_pv(struct format_instance *fid, struct dm_pool *mem,
struct volume_group *vg, struct config_node *pvn,
struct config_node *vgn __attribute((unused)),
struct dm_hash_table *pv_hash)
struct dm_hash_table *pv_hash, int *scan_done_once)
{
struct physical_volume *pv;
struct pv_list *pvl;
@ -186,7 +187,7 @@ static int _read_pv(struct format_instance *fid, struct dm_pool *mem,
/*
* Convert the uuid into a device.
*/
if (!(pv->dev = device_from_pvid(fid->fmt->cmd, &pv->id))) {
if (!(pv->dev = device_from_pvid(fid->fmt->cmd, &pv->id, scan_done_once))) {
char buffer[64] __attribute((aligned(8)));
if (!id_write_format(&pv->id, buffer, sizeof(buffer)))
@ -490,7 +491,8 @@ static int _read_lvnames(struct format_instance *fid __attribute((unused)),
struct dm_pool *mem,
struct volume_group *vg, struct config_node *lvn,
struct config_node *vgn __attribute((unused)),
struct dm_hash_table *pv_hash __attribute((unused)))
struct dm_hash_table *pv_hash __attribute((unused)),
int *scan_done_once __attribute((unused)))
{
struct logical_volume *lv;
struct config_node *cn;
@ -556,7 +558,8 @@ static int _read_lvsegs(struct format_instance *fid __attribute((unused)),
struct dm_pool *mem,
struct volume_group *vg, struct config_node *lvn,
struct config_node *vgn __attribute((unused)),
struct dm_hash_table *pv_hash)
struct dm_hash_table *pv_hash,
int *scan_done_once __attribute((unused)))
{
struct logical_volume *lv;
struct lv_list *lvl;
@ -612,6 +615,7 @@ static int _read_sections(struct format_instance *fid,
struct dm_hash_table *pv_hash, int optional)
{
struct config_node *n;
int scan_done_once = 0;
if (!(n = find_config_node(vgn, section))) {
if (!optional) {
@ -623,7 +627,7 @@ static int _read_sections(struct format_instance *fid,
}
for (n = n->child; n; n = n->sib) {
if (!fn(fid, mem, vg, n, vgn, pv_hash))
if (!fn(fid, mem, vg, n, vgn, pv_hash, &scan_done_once))
return_0;
}

2
lib/metadata/metadata.c
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@ -1416,7 +1416,7 @@ struct physical_volume * pvcreate_single(struct cmd_context *cmd,
pp = &default_pp;
if (pp->idp) {
if ((dev = device_from_pvid(cmd, pp->idp)) &&
if ((dev = device_from_pvid(cmd, pp->idp, NULL)) &&
(dev != dev_cache_get(pv_name, cmd->filter))) {
if (!id_write_format((const struct id*)&pp->idp->uuid,
buffer, sizeof(buffer)))