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Added LFS_T_RDONLY, LFS_T_RDWR, etc

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These mimic the relevant LFS_O_* flags, and allow users to assert
whether or not a traversal will mutate the filesystem:

  LFS_T_MODE          0x00000001  The traversal's access mode
  LFS_T_RDWR          0x00000000  Open traversal as read and write
  LFS_T_RDONLY        0x00000001  Open traversal as read only

In theory, these could also change internal allocations, but littlefs
doesn't really work that way.

Note we _don't_ add related LFS_GC_RDONLY, LFS_GC_RDWR, etc flags. These
are sort of implied by the relevant LFS_M_* flags.

Adds a bit more code, probably because of the slightly more complicated
internal constants for the internal traversals. But I think the
self-documentingness is worth it:

           code          stack          ctx
  before: 37200           2288          636
  after:  37220 (+0.1%)   2288 (+0.0%)  636 (+0.0%)
This commit is contained in:
Christopher Haster
2025-05-24 22:57:35 -05:00
parent 5b74aafa17
commit f7e17c8aad
9 changed files with 249 additions and 150 deletions
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5
scripts/dbgflags.py
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@@ -126,7 +126,10 @@ FLAGS = [
('i', 'INMTREE', 0x08000000, "Committing to mtree" ),
# Traversal flags
('T', 'MTREEONLY', 0x00000004, "Only traverse the mtree" ),
('T', 'MODE', 1, "The traversal's access mode" ),
('^', 'RDWR', 0, "Open traversal as read and write" ),
('^', 'RDONLY', 1, "Open traversal as read only" ),
('T', 'MTREEONLY', 0x00000002, "Only traverse the mtree" ),
('T', 'MKCONSISTENT',
0x00000100, "Make the filesystem consistent" ),
('T', 'LOOKAHEAD', 0x00000200, "Populate lookahead buffer" ),