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filter: use bcache for filter reads

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Filters are still applied before any device reading or
the label scan, but any filter checks that want to read
the device are skipped and the device is flagged.

After bcache is populated, but before lvm looks for
devices (i.e. before label scan), the filters are
reapplied to the devices that were flagged above.
The filters will then find the data they need in
bcache.
This commit is contained in:
David Teigland
2018-05-03 17:12:07 -05:00
parent 39ce38eb88
commit 57bb46c5e7
29 changed files with 408 additions and 154 deletions
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13
lib/device/dev-luks.c
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@@ -18,27 +18,22 @@
#define LUKS_SIGNATURE "LUKS\xba\xbe"
#define LUKS_SIGNATURE_SIZE 6
int dev_is_luks(struct device *dev, uint64_t *offset_found)
int dev_is_luks(struct device *dev, uint64_t *offset_found, int full)
{
char buf[LUKS_SIGNATURE_SIZE];
int ret = -1;
if (!dev_open_readonly(dev)) {
stack;
return -1;
}
if (!scan_bcache)
return -EAGAIN;
if (offset_found)
*offset_found = 0;
if (!dev_read(dev, 0, LUKS_SIGNATURE_SIZE, DEV_IO_SIGNATURES, buf))
if (!dev_read_bytes(dev, 0, LUKS_SIGNATURE_SIZE, buf))
goto_out;
ret = memcmp(buf, LUKS_SIGNATURE, LUKS_SIGNATURE_SIZE) ? 0 : 1;
out:
if (!dev_close(dev))
stack;
return ret;
}