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Replace zpool_events_next() "block" parm w/ "flags"

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zpool_events_next() can be called in blocking mode by specifying a
non-zero value for the "block" parameter.  However, the design of
the ZFS Event Daemon (zed) requires additional functionality from
zpool_events_next().  Instead of adding additional arguments to the
function, it makes more sense to use flags that can be bitwise-or'd
together.

This commit replaces the zpool_events_next() int "block" parameter with
an unsigned bitwise "flags" parameter.  It also defines ZEVENT_NONE
to specify the default behavior.  Since non-blocking mode can be
specified with the existing ZEVENT_NONBLOCK flag, the default behavior
becomes blocking mode.  This, in effect, inverts the previous use
of the "block" parameter.  Existing callers of zpool_events_next()
have been modified to check for the ZEVENT_NONBLOCK flag.

Signed-off-by: Chris Dunlap <cdunlap@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2
This commit is contained in:
Chris Dunlap
2014-02-12 10:30:18 -08:00
committed by Brian Behlendorf
parent 07917db990
commit 8c7aa0cfc4
4 changed files with 10 additions and 6 deletions
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lib/libzfs/libzfs_pool.c
+5 -4
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@@ -3790,11 +3790,12 @@ zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhisp)
* no new events are available. In either case the function returns 0 and
* it is up to the caller to free 'nvp'. In the case of a fatal error the
* function will return a non-zero value. When the function is called in
* blocking mode it will not return until a new event is available.
* blocking mode (the default, unless the ZEVENT_NONBLOCK flag is passed),
* it will not return until a new event is available.
*/
int
zpool_events_next(libzfs_handle_t *hdl, nvlist_t **nvp,
int *dropped, int block, int zevent_fd)
int *dropped, unsigned flags, int zevent_fd)
{
zfs_cmd_t zc = {"\0"};
int error = 0;
@@ -3803,7 +3804,7 @@ zpool_events_next(libzfs_handle_t *hdl, nvlist_t **nvp,
*dropped = 0;
zc.zc_cleanup_fd = zevent_fd;
if (!block)
if (flags & ZEVENT_NONBLOCK)
zc.zc_guid = ZEVENT_NONBLOCK;
if (zcmd_alloc_dst_nvlist(hdl, &zc, ZEVENT_SIZE) != 0)
@@ -3818,7 +3819,7 @@ retry:
goto out;
case ENOENT:
/* Blocking error case should not occur */
if (block)
if (!(flags & ZEVENT_NONBLOCK))
error = zpool_standard_error_fmt(hdl, errno,
dgettext(TEXT_DOMAIN, "cannot get event"));