[PATCH v6 0/5] smb: improve search speed of SMB2 maperror

[chenxiaosong.chenxiaosong@linux.dev]

From: ChenXiaoSong <chenxiaosong@kylinos.cn>

Sort `smb2_error_map_table` array at build time, thanks to David for his patches.

v5: https://lore.kernel.org/linux-cifs/20251224023145.608165-1-chenxiaosong.chenxiaosong@linux.dev/
v5->v6:
  - The following changes are based on David's suggestions. Thanks to David for the review.
  - Patch #03 #04 #05: replace `err_map_num` with `ARRAY_SIZE(smb2_error_map_table)`
  - Patch #03: add `__init` to `smb2_init_maperror()`
  - Patch #04: use `__inline_bsearch()` instead of `bsearch()`
               add `__always_inline` to `cmp_smb2_status()`

v4: https://lore.kernel.org/linux-cifs/20251206151826.2932970-1-chenxiaosong.chenxiaosong@linux.dev/
The following patches from v4 have already been merged into the mainline:
  - 01ab0d1640e3 smb/server: rename include guard in smb_common.h
  - d8f52650b24d smb/client: update some SMB2 status strings
  - d159702c9492 smb/client: add two elements to smb2_error_map_table array
  - 523ecd976632 smb: rename to STATUS_SMB_NO_PREAUTH_INTEGRITY_HASH_OVERLAP
  - bf80d1517dc8 smb/client: remove unused elements from smb2_error_map_table array
  - 6c1eb31ecb97 smb/client: reduce loop count in map_smb2_to_linux_error() by half

When searching for the last element and printing error message,
the comparison count are shown in the table below:

+----------+--------+--------+
|          | Before | After  |
|          |Patchset|Patchset|
+----------+--------+--------+
|Comparison|  3486  |   10   |
|  Count   |        |        |
+----------+--------+--------+

ChenXiaoSong (3):
  smb/client: check whether smb2_error_map_table is sorted in ascending
    order
  smb/client: use bsearch() to find target in smb2_error_map_table
  smb/client: introduce KUnit test to check search result of
    smb2_error_map_table

David Howells (2):
  cifs: Label SMB2 statuses with errors
  cifs: Autogenerate SMB2 error mapping table

 fs/smb/Kconfig                    |   17 +
 fs/smb/client/Makefile            |   14 +
 fs/smb/client/cifsfs.c            |    5 +
 fs/smb/client/gen_smb2_mapping    |   85 +
 fs/smb/client/smb2maperror.c      | 2464 +-------------------
 fs/smb/client/smb2maperror_test.c |   48 +
 fs/smb/client/smb2proto.h         |    1 +
 fs/smb/common/smb2status.h        | 3488 ++++++++++++++---------------
 8 files changed, 1972 insertions(+), 4150 deletions(-)
 create mode 100644 fs/smb/client/gen_smb2_mapping
 create mode 100644 fs/smb/client/smb2maperror_test.c

-- 
2.43.0