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Dirty znodes will be written on flash in committing process with
following states:
process A | znode state
------------------------------------------------------
do_commit | DIRTY_ZNODE
ubifs_tnc_start_commit | DIRTY_ZNODE
get_znodes_to_commit | DIRTY_ZNODE | COW_ZNODE
layout_commit | DIRTY_ZNODE | COW_ZNODE
fill_gap | 0
write master | 0 or OBSOLETE_ZNODE
process B | znode state
------------------------------------------------------
do_commit | DIRTY_ZNODE[1]
ubifs_tnc_start_commit | DIRTY_ZNODE
get_znodes_to_commit | DIRTY_ZNODE | COW_ZNODE
ubifs_tnc_end_commit | DIRTY_ZNODE | COW_ZNODE
write_index | 0
write master | 0 or OBSOLETE_ZNODE[2] or
| DIRTY_ZNODE[3]
[1] znode is dirtied without concurrent committing process
[2] znode is copied up (re-dirtied by other process) before cleaned
up in committing process
[3] znode is re-dirtied after cleaned up in committing process
Currently, the clean znode count is updated in free_obsolete_znodes(),
which is called only in normal path. If do_commit failed, clean znode
count won't be updated, which triggers a failure ubifs assertion[4] in
ubifs_tnc_close():
ubifs_assert_failed [ubifs]: UBIFS assert failed: freed == n
[4] Commit
|
||
|---|---|---|
| .. | ||
| auth.c | ||
| budget.c | ||
| commit.c | ||
| compress.c | ||
| crypto.c | ||
| debug.c | ||
| debug.h | ||
| dir.c | ||
| file.c | ||
| find.c | ||
| gc.c | ||
| io.c | ||
| ioctl.c | ||
| journal.c | ||
| Kconfig | ||
| key.h | ||
| log.c | ||
| lprops.c | ||
| lpt_commit.c | ||
| lpt.c | ||
| Makefile | ||
| master.c | ||
| misc.c | ||
| misc.h | ||
| orphan.c | ||
| recovery.c | ||
| replay.c | ||
| sb.c | ||
| scan.c | ||
| shrinker.c | ||
| super.c | ||
| sysfs.c | ||
| tnc_commit.c | ||
| tnc_misc.c | ||
| tnc.c | ||
| ubifs-media.h | ||
| ubifs.h | ||
| xattr.c | ||