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a8b3a677e7
This adds support for nocow mode, where we do writes in-place when possible. Patch components: - New boolean filesystem and inode option, nocow: note that when nocow is enabled, data checksumming and compression are implicitly disabled - To prevent in-place writes from racing with data moves (data_update.c) or bucket reuse (i.e. a bucket being reused and re-allocated while a nocow write is in flight, we have a new locking mechanism. Buckets can be locked for either data update or data move, using a fixed size hash table of two_state_shared locks. We don't have any chaining, meaning updates and moves to different buckets that hash to the same lock will wait unnecessarily - we'll want to watch for this becoming an issue. - The allocator path also needs to check for in-place writes in flight to a given bucket before giving it out: thus we add another counter to bucket_alloc_state so we can track this. - Fsync now may need to issue cache flushes to block devices instead of flushing the journal. We add a device bitmask to bch_inode_info, ei_devs_need_flush, which tracks devices that need to have flushes issued - note that this will lead to unnecessary flushes when other codepaths have already issued flushes, we may want to replace this with a sequence number. - New nocow write path: look up extents, and if they're writable write to them - otherwise fall back to the normal COW write path. XXX: switch to sequence numbers instead of bitmask for devs needing journal flush XXX: ei_quota_lock being a mutex means bch2_nocow_write_done() needs to run in process context - see if we can improve this Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
78 lines
1.3 KiB
Makefile
78 lines
1.3 KiB
Makefile
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obj-$(CONFIG_BCACHEFS_FS) += bcachefs.o
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bcachefs-y := \
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alloc_background.o \
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alloc_foreground.o \
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backpointers.o \
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bkey.o \
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bkey_methods.o \
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bkey_sort.o \
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bset.o \
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btree_cache.o \
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btree_gc.o \
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btree_io.o \
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btree_iter.o \
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btree_key_cache.o \
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btree_locking.o \
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btree_update_interior.o \
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btree_update_leaf.o \
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btree_write_buffer.o \
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buckets.o \
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buckets_waiting_for_journal.o \
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chardev.o \
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checksum.o \
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clock.o \
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compress.o \
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counters.o \
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debug.o \
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dirent.o \
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disk_groups.o \
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data_update.o \
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ec.o \
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errcode.o \
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error.o \
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extents.o \
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extent_update.o \
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fs.o \
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fs-common.o \
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fs-ioctl.o \
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fs-io.o \
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fsck.o \
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inode.o \
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io.o \
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journal.o \
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journal_io.o \
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journal_reclaim.o \
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journal_sb.o \
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journal_seq_blacklist.o \
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keylist.o \
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lru.o \
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mean_and_variance.o \
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migrate.o \
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move.o \
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movinggc.o \
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nocow_locking.o \
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opts.o \
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printbuf.o \
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quota.o \
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rebalance.o \
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recovery.o \
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reflink.o \
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replicas.o \
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siphash.o \
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six.o \
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subvolume.o \
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super.o \
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super-io.o \
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sysfs.o \
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tests.o \
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trace.o \
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two_state_shared_lock.o \
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util.o \
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varint.o \
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xattr.o
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bcachefs-$(CONFIG_BCACHEFS_POSIX_ACL) += acl.o
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obj-$(CONFIG_MEAN_AND_VARIANCE_UNIT_TEST) += mean_and_variance_test.o
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