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Add zpool_events_seek() functionality

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The ZFS_IOC_EVENTS_SEEK ioctl was added to allow user space callers
to seek around the zevent file descriptor by EID.  When a specific
EID is passed and it exists the cursor will be positioned there.
If the EID is no longer cached by the kernel ENOENT is returned.
The caller may also pass ZEVENT_SEEK_START or ZEVENT_SEEK_END to seek
to those respective locations.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chris Dunlap <cdunlap@llnl.gov>
Issue #2
This commit is contained in:
Brian Behlendorf
2013-11-22 14:52:16 -08:00
parent a2f1945ee3
commit 75e3ff58fe
7 changed files with 128 additions and 1 deletions
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module/zfs/fm.c
+61
View File
@@ -664,6 +664,67 @@ out:
return (error);
}
/*
* The caller may seek to a specific EID by passing that EID. If the EID
* is still available in the posted list of events the cursor is positioned
* there. Otherwise ENOENT is returned and the cursor is not moved.
*
* There are two reserved EIDs which may be passed and will never fail.
* ZEVENT_SEEK_START positions the cursor at the start of the list, and
* ZEVENT_SEEK_END positions the cursor at the end of the list.
*/
int
zfs_zevent_seek(zfs_zevent_t *ze, uint64_t eid)
{
zevent_t *ev;
int error = 0;
mutex_enter(&zevent_lock);
if (eid == ZEVENT_SEEK_START) {
if (ze->ze_zevent)
list_remove(&ze->ze_zevent->ev_ze_list, ze);
ze->ze_zevent = NULL;
goto out;
}
if (eid == ZEVENT_SEEK_END) {
if (ze->ze_zevent)
list_remove(&ze->ze_zevent->ev_ze_list, ze);
ev = list_head(&zevent_list);
if (ev) {
ze->ze_zevent = ev;
list_insert_head(&ev->ev_ze_list, ze);
} else {
ze->ze_zevent = NULL;
}
goto out;
}
for (ev = list_tail(&zevent_list); ev != NULL;
ev = list_prev(&zevent_list, ev)) {
if (ev->ev_eid == eid) {
if (ze->ze_zevent)
list_remove(&ze->ze_zevent->ev_ze_list, ze);
ze->ze_zevent = ev;
list_insert_head(&ev->ev_ze_list, ze);
break;
}
}
if (ev == NULL)
error = ENOENT;
out:
mutex_exit(&zevent_lock);
return (error);
}
void
zfs_zevent_init(zfs_zevent_t **zep)
{
module/zfs/zfs_ioctl.c
+24
View File
@@ -4919,6 +4919,28 @@ zfs_ioc_events_clear(zfs_cmd_t *zc)
return (0);
}
/*
* inputs:
* zc_guid eid | ZEVENT_SEEK_START | ZEVENT_SEEK_END
* zc_cleanup zevent file descriptor
*/
static int
zfs_ioc_events_seek(zfs_cmd_t *zc)
{
zfs_zevent_t *ze;
minor_t minor;
int error;
error = zfs_zevent_fd_hold(zc->zc_cleanup_fd, &minor, &ze);
if (error != 0)
return (error);
error = zfs_zevent_seek(ze, zc->zc_guid);
zfs_zevent_fd_rele(zc->zc_cleanup_fd);
return (error);
}
/*
* inputs:
* zc_name name of new filesystem or snapshot
@@ -5393,6 +5415,8 @@ zfs_ioctl_init(void)
zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);
zfs_ioctl_register_legacy(ZFS_IOC_EVENTS_CLEAR, zfs_ioc_events_clear,
zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);
zfs_ioctl_register_legacy(ZFS_IOC_EVENTS_SEEK, zfs_ioc_events_seek,
zfs_secpolicy_config, NO_NAME, B_FALSE, POOL_CHECK_NONE);
}
int