bcachefs: Standardize helpers for printing enum strs with bounds checks

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: fixup for building in userspace

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: bch2_sb_field_get() refactoring

Instead of using token pasting to generate methods for each superblock
section, just make the type a parameter to bch2_sb_field_get().

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: fix crc32c checksum merge byte order problem

An fsstress task on a big endian system (s390x) quickly produces a
bunch of CRC errors in the system logs. Most of these are related to
the narrow CRCs path, but the fundamental problem can be reduced to
a single write and re-read (after dropping caches) of a previously
merged extent.

The key merge path that handles extent merges eventually calls into
bch2_checksum_merge() to combine the CRCs of the associated extents.
This code attempts to avoid a byte order swap by feeding the le64
values into the crc32c code, but the latter casts the resulting u64
value down to a u32, which truncates the high bytes where the actual
crc value ends up. This results in a CRC value that does not change
(since it is merged with a CRC of 0), and checksum failures ensue.

Fix the checksum merge code to swap to cpu byte order on the
boundaries to the external crc code such that any value casting is
handled properly.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fall back to requesting passphrase directly

We can only do this in userspace, unfortunately - but kernel keyrings
have never seemed to worked reliably, this is a useful fallback.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fixes for building in userspace

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fix error checks in bch2_chacha_encrypt_key()

crypto_alloc_sync_skcipher() returns an ERR_PTR, not NULL.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fix W=12 build errors

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fix -Wcompare-distinct-pointer-types in do_encrypt()

When building bcachefs for 32-bit ARM, there is a warning when using
min() to compare a variable of type 'size_t' with an expression of type
'unsigned long':

fs/bcachefs/checksum.c:142:22: error: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12) - offset) *' (aka 'unsigned long *')) [-Werror,-Wcompare-distinct-pointer-types]
142 | unsigned pg_len = min(len, PAGE_SIZE - offset);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:69:19: note: expanded from macro 'min'
69 | #define min(x, y) __careful_cmp(x, y, <)
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:38:24: note: expanded from macro '__careful_cmp'
38 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~~~~~~~
include/linux/minmax.h:28:4: note: expanded from macro '__safe_cmp'
28 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~~~~~~~
include/linux/minmax.h:22:28: note: expanded from macro '__typecheck'
22 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
1 error generated.

On 64-bit architectures, size_t is 'unsigned long', so there is no
warning when comparing these two expressions. Use min_t(size_t, ...) for
this situation, eliminating the warning.

Fixes: 1fb50457684f ("bcachefs: Fix memory corruption in encryption path")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Move bch_sb_field_crypt code to checksum.c

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fix assorted checkpatch nits

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Suppresss various error messages in no_data_io mode

We commonly use no_data_io mode when debugging filesystem metadata
dumps, where data checksum/compression errors are expected and
unimportant - this patch suppresses these.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Delete redundant log messages

Now that we have distinct error codes for different memory allocation
failures, the early init log messages are no longer needed.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Assorted sparse fixes

- endianness fixes
- mark some things static
- fix a few __percpu annotations
- fix silent enum conversions

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Private error codes: ENOMEM

This adds private error codes for most (but not all) of our ENOMEM uses,
which makes it easier to track down assorted allocation failures.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Inlining improvements

- Don't call into bch2_encrypt_bio() when we're not encrypting
- Pull slowpath out of trans_lock_write()
- Make sure bc2h_trans_journal_res_get() gets inlined.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Assorted checkpatch fixes

checkpatch.pl gives lots of warnings that we don't want - suggested
ignore list:

ASSIGN_IN_IF
UNSPECIFIED_INT - bcachefs coding style prefers single token type names
NEW_TYPEDEFS - typedefs are occasionally good
FUNCTION_ARGUMENTS - we prefer to look at functions in .c files
(hopefully with docbook documentation), not .h
file prototypes
MULTISTATEMENT_MACRO_USE_DO_WHILE
- we have _many_ x-macros and other macros where
we can't do this

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Use bch2_err_str() in error messages

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Improve checksum error messages

We're seeing checksum errors in the bch2_rechecksum_bio() path - give it
a better error message to help track this down.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Printbuf rework

This converts bcachefs to the modern printbuf interface/implementation,
synced with the version to be submitted upstream.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Fix memory corruption in encryption path

When do_encrypt() was passed a vmalloc address and the buffer spanned
more than a single page, we were encrypting/decrypting completely
different pages than the ones intended.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Fix encryption path on arm

flush_dcache_page() is not a noop on arm, but we were using
virt_to_page() instead of vmalloc_to_page() for an address on the kernel
stack - vmalloc memory, leading to an oops in flush_dcache_page().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Switch to key_type_user, not logon

The only difference key_type_logon and key_type_user is that
key_type_logon keys can't be read by userspace.

However, userspace has actually been adding keys to both the logon and
user keychains, because userspace fsck requires the keychain interface -
so we might as well just use user and drop the logon keychain.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Check for errors from crypto_skcipher_encrypt()

Apparently it actually is possible for crypto_skcipher_encrypt() to
return an error - not sure why that would be - but we need to replace
our assertion with actual error handling.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: Log & error message improvements

- Add a shim uuid_unparse_lower() in the kernel, since %pU doesn't work
in userspace

- We don't need to print the bcachefs: or the filesystem name prefix in
userspace

- Improve a few error messages

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: More enum strings

This patch converts more enums in the on disk format to our standard
x-macro-with-strings deal - to enable better pretty-printing.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

bcachefs: add bcachefs xxhash support

xxhash is a much faster algorithm compared to crc32.
could be used to speed up checksum calculation.
xxhash 64-bit only, as it is much faster on 64-bit CPUs compared to xxh32.

Signed-off-by: jpsollie <janpieter.sollie@edpnet.be>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Prepare checksums for more advanced algorithms

Perform abstraction of hash calculation for advanced checksum algorithms.
Algorithms like xxhash do not store their state as a u64 int.

Signed-off-by: jpsollie <janpieter.sollie@edpnet.be>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Track incompressible data

This fixes the background_compression option: wihout some way of marking
data as incompressible, rebalance will keep rewriting incompressible
data over and over.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: kill bio_for_each_contig_segment()

With multipage bvecs it's not needed anymore

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: kill bch2_crc64_update

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Merge extents with checksums

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: use crc64 from lib/

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>