83b3bdbc8a
- Implement real draining for vfs consumers by not relying on the mnt_lock and using instead a refcount in order to keep track of lock requesters. - Due to the change above, remove the mnt_lock lockmgr because it is now useless. - Due to the change above, vfs_busy() is no more linked to a lockmgr. Change so its KPI by removing the interlock argument and defining 2 new flags for it: MBF_NOWAIT which basically replaces the LK_NOWAIT of the old version (which was unlinked from the lockmgr alredy) and MBF_MNTLSTLOCK which provides the ability to drop the mountlist_mtx once the mnt interlock is held (ability still desired by most consumers). - The stub used into vfs_mount_destroy(), that allows to override the mnt_ref if running for more than 3 seconds, make it totally useless. Remove it as it was thought to work into older versions. If a problem of "refcount held never going away" should appear, we will need to fix properly instead than trust on such hackish solution. - Fix a bug where returning (with an error) from dounmount() was still leaving the MNTK_MWAIT flag on even if it the waiters were actually woken up. Just a place in vfs_mount_destroy() is left because it is going to recycle the structure in any case, so it doesn't matter. - Remove the markercnt refcount as it is useless. This patch modifies VFS ABI and breaks KPI for vfs_busy() so manpages and __FreeBSD_version will be modified accordingly. Discussed with: kib Tested by: pho |
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|---|---|---|
| .. | ||
| bde | ||
| cache | ||
| concat | ||
| eli | ||
| gate | ||
| journal | ||
| label | ||
| linux_lvm | ||
| mirror | ||
| multipath | ||
| nop | ||
| part | ||
| raid3 | ||
| shsec | ||
| stripe | ||
| uzip | ||
| vinum | ||
| virstor | ||
| zero | ||
| geom_aes.c | ||
| geom_bsd_enc.c | ||
| geom_bsd.c | ||
| geom_ccd.c | ||
| geom_ctl.c | ||
| geom_ctl.h | ||
| geom_dev.c | ||
| geom_disk.c | ||
| geom_disk.h | ||
| geom_dump.c | ||
| geom_event.c | ||
| geom_fox.c | ||
| geom_int.h | ||
| geom_io.c | ||
| geom_kern.c | ||
| geom_mbr_enc.c | ||
| geom_mbr.c | ||
| geom_pc98_enc.c | ||
| geom_pc98.c | ||
| geom_slice.c | ||
| geom_slice.h | ||
| geom_subr.c | ||
| geom_sunlabel_enc.c | ||
| geom_sunlabel.c | ||
| geom_vfs.c | ||
| geom_vfs.h | ||
| geom_vol_ffs.c | ||
| geom.h | ||
| notes | ||