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2a285686c1
Add a new lock, b->write_lock, which is required to actually modify - or write - a btree node; this lock is only held for short durations. This means we can write out a btree node without taking b->lock, which _is_ held for long durations - solving a deadlock when btree_flush_write() (from the journalling code) is called with a btree node locked. Right now just occurs in bch_btree_set_root(), but with an upcoming journalling rework is going to happen a lot more. This also turns b->lock is now more of a read/intent lock instead of a read/write lock - but not completely, since it still blocks readers. May turn it into a real intent lock at some point in the future. Signed-off-by: Kent Overstreet <kmo@daterainc.com> |
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.. | ||
alloc.c | ||
bcache.h | ||
bset.c | ||
bset.h | ||
btree.c | ||
btree.h | ||
closure.c | ||
closure.h | ||
debug.c | ||
debug.h | ||
extents.c | ||
extents.h | ||
io.c | ||
journal.c | ||
journal.h | ||
Kconfig | ||
Makefile | ||
movinggc.c | ||
request.c | ||
request.h | ||
stats.c | ||
stats.h | ||
super.c | ||
sysfs.c | ||
sysfs.h | ||
trace.c | ||
util.c | ||
util.h | ||
writeback.c | ||
writeback.h |