diff options
| author | Brian Behlendorf <[email protected]> | 2013-11-22 14:52:16 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2014-03-31 16:10:57 -0700 |
| commit | 75e3ff58feda2d836c4546c5dc2e98fcd2d1a67b (patch) | |
| tree | 56f18f143be48ff4b4d06f93ddc730e77cd9a2f6 /module/zfs/zfs_ioctl.c | |
| parent | a2f1945ee3ce8eba02ef54168c72f3be8f2cebdc (diff) | |
Add zpool_events_seek() functionality
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 <[email protected]>
Signed-off-by: Chris Dunlap <[email protected]>
Issue #2
Diffstat (limited to 'module/zfs/zfs_ioctl.c')
| -rw-r--r-- | module/zfs/zfs_ioctl.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c index 5951bc673..cd4779016 100644 --- a/module/zfs/zfs_ioctl.c +++ b/module/zfs/zfs_ioctl.c @@ -4921,6 +4921,28 @@ zfs_ioc_events_clear(zfs_cmd_t *zc) /* * 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 * zc_value full name of old 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 |