2017-03-17 06:18:50 +00:00
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_COMPRESS_H
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#define _BCACHEFS_COMPRESS_H
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#include "extents_types.h"
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2023-10-22 22:29:54 +00:00
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static const unsigned __bch2_compression_opt_to_type[] = {
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#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
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BCH_COMPRESSION_OPTS()
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#undef x
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};
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2023-07-13 02:27:16 +00:00
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struct bch_compression_opt {
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u8 type:4,
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level:4;
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};
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2023-10-22 22:29:54 +00:00
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static inline struct bch_compression_opt __bch2_compression_decode(unsigned v)
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2023-07-13 02:27:16 +00:00
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{
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return (struct bch_compression_opt) {
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.type = v & 15,
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.level = v >> 4,
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};
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}
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2023-10-22 22:29:54 +00:00
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static inline bool bch2_compression_opt_valid(unsigned v)
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{
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struct bch_compression_opt opt = __bch2_compression_decode(v);
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return opt.type < ARRAY_SIZE(__bch2_compression_opt_to_type) && !(!opt.type && opt.level);
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}
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static inline struct bch_compression_opt bch2_compression_decode(unsigned v)
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{
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return bch2_compression_opt_valid(v)
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? __bch2_compression_decode(v)
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: (struct bch_compression_opt) { 0 };
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}
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2023-07-13 02:27:16 +00:00
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static inline unsigned bch2_compression_encode(struct bch_compression_opt opt)
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{
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return opt.type|(opt.level << 4);
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}
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static inline enum bch_compression_type bch2_compression_opt_to_type(unsigned v)
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{
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return __bch2_compression_opt_to_type[bch2_compression_decode(v).type];
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}
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2017-03-17 06:18:50 +00:00
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int bch2_bio_uncompress_inplace(struct bch_fs *, struct bio *,
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struct bch_extent_crc_unpacked *);
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int bch2_bio_uncompress(struct bch_fs *, struct bio *, struct bio *,
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struct bvec_iter, struct bch_extent_crc_unpacked);
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unsigned bch2_bio_compress(struct bch_fs *, struct bio *, size_t *,
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struct bio *, size_t *, unsigned);
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int bch2_check_set_has_compressed_data(struct bch_fs *, unsigned);
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void bch2_fs_compress_exit(struct bch_fs *);
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int bch2_fs_compress_init(struct bch_fs *);
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bcachefs: rebalance_work
This adds a new btree, rebalance_work, to eliminate scanning required
for finding extents that need work done on them in the background - i.e.
for the background_target and background_compression options.
rebalance_work is a bitset btree, where a KEY_TYPE_set corresponds to an
extent in the extents or reflink btree at the same pos.
A new extent field is added, bch_extent_rebalance, which indicates that
this extent has work that needs to be done in the background - and which
options to use. This allows per-inode options to be propagated to
indirect extents - at least in some circumstances. In this patch,
changing IO options on a file will not propagate the new options to
indirect extents pointed to by that file.
Updating (setting/clearing) the rebalance_work btree is done by the
extent trigger, which looks at the bch_extent_rebalance field.
Scanning is still requrired after changing IO path options - either just
for a given inode, or for the whole filesystem. We indicate that
scanning is required by adding a KEY_TYPE_cookie key to the
rebalance_work btree: the cookie counter is so that we can detect that
scanning is still required when an option has been flipped mid-way
through an existing scan.
Future possible work:
- Propagate options to indirect extents when being changed
- Add other IO path options - nr_replicas, ec, to rebalance_work so
they can be applied in the background when they change
- Add a counter, for bcachefs fs usage output, showing the pending
amount of rebalance work: we'll probably want to do this after the
disk space accounting rewrite (moving it to a new btree)
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2023-10-20 17:33:14 +00:00
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void bch2_compression_opt_to_text(struct printbuf *, u64);
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2023-07-13 02:27:16 +00:00
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int bch2_opt_compression_parse(struct bch_fs *, const char *, u64 *, struct printbuf *);
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void bch2_opt_compression_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *, u64);
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2023-10-22 22:29:54 +00:00
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int bch2_opt_compression_validate(u64, struct printbuf *);
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2023-07-13 02:27:16 +00:00
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#define bch2_opt_compression (struct bch_opt_fn) { \
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2023-10-22 22:29:54 +00:00
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.parse = bch2_opt_compression_parse, \
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.to_text = bch2_opt_compression_to_text, \
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.validate = bch2_opt_compression_validate, \
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2023-07-13 02:27:16 +00:00
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}
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2017-03-17 06:18:50 +00:00
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#endif /* _BCACHEFS_COMPRESS_H */
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