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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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tests/test_mount.toml
+2 -2
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@@ -403,7 +403,7 @@ code = '''
// traverse to find blocks
lfsr_traversal_t t;
lfsr_traversal_open(&lfs, &t, 0) => 0;
lfsr_traversal_open(&lfs, &t, LFS_T_RDONLY) => 0;
lfs_block_t k = 0;
for (lfs_block_t j = 0;; j++) {
assert(j < 2*BLOCK_COUNT);
@@ -492,7 +492,7 @@ code = '''
// traverse to find blocks
lfsr_traversal_t t;
lfsr_traversal_open(&lfs, &t, 0) => 0;
lfsr_traversal_open(&lfs, &t, LFS_T_RDONLY) => 0;
lfs_block_t k = 0;
for (lfs_block_t j = 0;; j++) {
assert(j < 2*BLOCK_COUNT);