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scan: setup bcache for commands using lvmetad

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Commands using lvmetad will not begin with a proper
label_scan which initializes bcache, but may later
decide they need to scan a set of devs, in which case
they'll need bcache set up at that point.
This commit is contained in:
David Teigland 2018-02-14 15:45:31 -06:00
parent 6e580465b5
commit 7bce66c5e8
1 changed files with 47 additions and 19 deletions
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66
lib/label/label.c
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@ -570,6 +570,38 @@ static int _scan_list(struct dm_list *devs, int *failed)
return 1;
}
static int _setup_bcache(int cache_blocks)
{
struct io_engine *ioe;
/* No devices can happen, just create bcache with any small number. */
if (!cache_blocks)
cache_blocks = 8;
/*
* 100 is arbitrary, it's the max number of concurrent aio's
* possible, i.e, the number of devices that can be read at
* once. Should this be configurable?
*/
if (!(ioe = create_async_io_engine(100))) {
log_error("Failed to create bcache io engine.");
return 0;
}
/*
* Configure one cache block for each device on the system.
* We won't generally need to cache that many because some
* of the devs will not be lvm devices, and we don't need
* an entry for those. We might want to change this.
*/
if (!(scan_bcache = bcache_create(BCACHE_BLOCK_SIZE_IN_SECTORS, cache_blocks, ioe))) {
log_error("Failed to create bcache with %d cache blocks.", cache_blocks);
return 0;
}
return 1;
}
/*
* Scan and cache lvm data from all devices on the system.
* The cache should be empty/reset before calling this.
@ -581,8 +613,6 @@ int label_scan(struct cmd_context *cmd)
struct dev_iter *iter;
struct device_list *devl;
struct device *dev;
struct io_engine *ioe;
int cache_blocks;
log_debug_devs("Finding devices to scan");
@ -621,25 +651,11 @@ int label_scan(struct cmd_context *cmd)
dev_iter_destroy(iter);
if (!scan_bcache) {
/* No devices can happen, just create bcache with any small number. */
if (!(cache_blocks = dm_list_size(&all_devs)))
cache_blocks = 8;
/*
* 100 is arbitrary, it's the max number of concurrent aio's
* possible, i.e, the number of devices that can be read at
* once. Should this be configurable?
* FIXME: there should probably be some max number of
* cache blocks we use when setting up bcache.
*/
if (!(ioe = create_async_io_engine(100)))
return 0;
/*
* Configure one cache block for each device on the system.
* We won't generally need to cache that many because some
* of the devs will not be lvm devices, and we don't need
* an entry for those. We might want to change this.
*/
if (!(scan_bcache = bcache_create(BCACHE_BLOCK_SIZE_IN_SECTORS, cache_blocks, ioe)))
if (!_setup_bcache(dm_list_size(&all_devs)))
return 0;
}
@ -660,6 +676,18 @@ int label_scan_devs(struct cmd_context *cmd, struct dm_list *devs)
{
struct device_list *devl;
if (!scan_bcache) {
/*
* This is only needed when commands are using lvmetad, in
* which case they don't do an initial label_scan, but may
* later need to rescan certain devs from disk and call this
* function.
* FIXME: is there some better number to choose here?
*/
if (!_setup_bcache(32))
return 0;
}
dm_list_iterate_items(devl, devs) {
if (_in_bcache(devl->dev)) {
bcache_invalidate_fd(scan_bcache, devl->dev->bcache_fd);