kernel.git/fs/bcachefs/Kconfig, branch linux-6.7.y

bcachefs: Put erasure coding behind an EXPERIMENTAL kconfig option

2023-11-24T05:29:58Z

We still have disk space accounting changes coming for erasure coding, and the changes won't be as strictly backwards compatible as they'd ought to be - specifically, we need to start accounting striped data under a separate counter in bch_alloc (which describes buckets). A fsck will suffice for upgrading/downgrading, but since erasure coding is the most incomplete major feature of bcachefs it still makes sense to put behind a separate kconfig option, so that users are fully aware. Signed-off-by: Kent Overstreet

bcachefs: CONFIG_BCACHEFS_DEBUG_TRANSACTIONS no longer defaults to y

2023-11-05T02:19:13Z

BCACHEFS_DEBUG_TRANSACTIONS is useful, but it's too expensive to have on by default - and it hasn't been coming up in bug reports. Turn it off by default until we figure out a way to make it cheaper. Signed-off-by: Kent Overstreet

bcachefs: Fix MEAN_AND_VARIANCE kconfig options

2023-11-04T18:17:11Z

Fixes: https://lore.kernel.org/linux-bcachefs/CAMuHMdXpwMdLuoWsNGa8qacT_5Wv-vSTz0xoBR5n_fnD9cNOuQ@mail.gmail.com/ Signed-off-by: Kent Overstreet

bcachefs: Compression levels

2023-10-22T21:10:07Z

This allows including a compression level when specifying a compression type, e.g. compression=zstd:15 Values from 1 through 15 indicate compression levels, 0 or unspecified indicates the default. For LZ4, values 3-15 specify that the HC algorithm should be used. Note that for compatibility, extents themselves only include the compression type, not the compression level. This means that specifying the same compression algorithm but different compression levels for the compression and background_compression options will have no effect. XXX: perhaps we could add a warning for this Signed-off-by: Kent Overstreet

bcachefs: Mark as EXPERIMENTAL

2023-10-22T21:10:06Z

As discussed on list, bcachefs is going to be marked as experimental for a few releases, until the inevitable tide of new bug reports subsides. Signed-off-by: Kent Overstreet

bcachefs: time stats now uses the mean_and_variance module.

2023-10-22T21:09:43Z

Signed-off-by: Daniel Hill Signed-off-by: Kent Overstreet

bcachefs: Mean and variance

2023-10-22T21:09:43Z

This module provides a fast 64bit implementation of basic statistics functions, including mean, variance and standard deviation in both weighted and unweighted variants, the unweighted variant has a 32bit limitation per sample to prevent overflow when squaring. Signed-off-by: Daniel Hill Signed-off-by: Kent Overstreet

bcachefs: Improved errcodes

2023-10-22T21:09:36Z

Instead of overloading standard error codes (EINTR/EAGAIN), and defining short lists of error codes in multiple places that potentially end up overlapping & conflicting, we're now going to have one master list of error codes. Error codes are defined with an x-macro: thus we also have bch2_err_str() now. Also, error codes have a class field. Now, instead of checking for errors with ==, code should use bch2_err_matches(), which returns true if the error is equal to or a sub-error of the error class. This means we can define unique errors for every source location where an error is generated, which will help improve our error messages. Signed-off-by: Kent Overstreet

bcachefs: added lock held time stats

2023-10-22T21:09:35Z

We now record the length of time btree locks are held and expose this in debugfs. Enabled via CONFIG_BCACHEFS_LOCK_TIME_STATS. Signed-off-by: Daniel Hill Signed-off-by: Kent Overstreet

bcachefs: Split out CONFIG_BCACHEFS_DEBUG_TRANSACTIONS

2023-10-22T21:09:19Z

This puts the btree_transactions sysfs/debugfs file behind a separate config option - it's highly useful, but not cheap enough to enable permenantly. Signed-off-by: Kent Overstreet