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device: Add flag to indicate that a code path can support AIO

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Until the whole source supports AIO, library code can check for
AIO_SUPPORTED_CODE_PATH to determine whether or not it is OK
to use AIO.
This commit is contained in:
Alasdair G Kergon 2018-01-22 16:56:25 +00:00
parent e869a52cc4
commit 7a9af3cd0e
3 changed files with 7 additions and 1 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.178 -
=====================================
Add AIO_SUPPORTED_CODE_PATH to indicate whether AIO may be used.
Configure ensures /usr/bin dir is checked for dmpd tools.
Restore pvmove support for wide-clustered active volumes (2.02.177).
Avoid non-exclusive activation of exclusive segment types.

2
lib/cache/lvmcache.c vendored
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@ -1156,7 +1156,7 @@ int lvmcache_label_scan(struct cmd_context *cmd)
while ((dev = dev_iter_get(iter))) {
nr_labels_outstanding++;
if (!label_read_callback(dev, UINT64_C(0), 0, _process_label_data, &nr_labels_outstanding))
if (!label_read_callback(dev, UINT64_C(0), AIO_SUPPORTED_CODE_PATH, _process_label_data, &nr_labels_outstanding))
nr_labels_outstanding--;
dev_count++;
}

5
lib/device/device.h
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@ -32,6 +32,11 @@
#define DEV_ASSUMED_FOR_LV 0x00000200 /* Is device assumed for an LV */
#define DEV_NOT_O_NOATIME 0x00000400 /* Don't use O_NOATIME */
/* ioflags */
#define AIO_SUPPORTED_CODE_PATH 0x00000001 /* Set if the code path supports AIO */
#define aio_supported_code_path(ioflags) (((ioflags) & AIO_SUPPORTED_CODE_PATH) ? 1 : 0)
/*
* Standard format for callback functions.
* When provided, callback functions are called exactly once.