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Added format flags to lfsr_format

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This is mainly to solve the weird check-hole where passing CKPROGS/
CKREADS as mount flags has no effect on lfsr_format (I mean, it'd be a
bit silly if it did somehow):

  LFS_F_RDWR              0  // Format the filesystem as read and write
  LFS_F_CKPROGS  0x00000010  // Check progs by reading back progged data
  LFS_F_CKREADS  0x00000020  // Check reads via parity bits/checksums

This makes lfsr_format a more cumbersome interface, but I don't know if
this is necessarily a bad thing. There's always risk of data loss when
calling lfsr_format, so maybe it should be a pain to call.

At the very least, format flags may be useful in the future for
enabling/disabling format-time things such as the planned block-map,
parity-tree, etc. Though it's unclear if such significant settings
should be format flags or somehow encoded as fields in our config
struct.

---

The LFS_F_* format flags of course ended up conflicting with our
internal LFS_F_* flags, so I renamed most of the internal flags to match
the closest flag set they participate in:

- LFS_F_TYPE        -> LFS_O_TYPE
- LFS_F_UNFLUSH     -> LFS_O_UNFLUSH
- LFS_F_UNSYNC      -> LFS_O_UNSYNC
- LFS_F_ORPHAN      -> LFS_O_ORPHAN
- LFS_F_ZOMBIE      -> LFS_O_ZOMBIE

- LFS_F_ORPHANS     -> LFS_I_ORPHANS
- LFS_F_UNCOMPACTED -> LFS_I_UNCOMPACTED

- LFS_F_TSTATE      -> LFS_T_TSTATE
- LFS_F_BTYPE       -> LFS_T_BTYPE
- LFS_F_DIRTY       -> LFS_T_DIRTY
- LFS_F_MUTATED     -> LFS_T_MUTATED

This may make it a bit less clear which flags are a part of the public
API, vs intended only for internal use, but at the very least our asserts
in format/mount/open/etc should catch most of these mistakes.

---

Code cost ended up being pretty minimal. Actually negative. This is the
second time we're _adding_ a feature that somehow saves code, though the
reality for this one is we're really just pushing constants up into the
user's stack frame. Still, it's a good indication the cost of format
flags is small:

           code          stack
  before: 36452           2680
  after:  36448 (-0.0%)   2680 (+0.0%)
This commit is contained in:
Christopher Haster
2024-08-12 13:50:36 -05:00
parent dffd8fa0fa
commit acad3a3143
21 changed files with 785 additions and 678 deletions
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tests/test_grow.toml
+12 -12
View File
@@ -29,7 +29,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = SMALLER_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
lfsr_mount(&lfs, LFS_M_RDWR, &cfg) => 0;
// fsstat up to date?
@@ -148,7 +148,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = BIGGER_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
lfsr_mount(&lfs, LFS_M_RDWR, &cfg) => 0;
// fsstat up to date?
@@ -209,7 +209,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = SMALLER_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
lfsr_mount(&lfs, LFS_M_RDWR, &cfg) => 0;
// fsstat up to date?
@@ -324,7 +324,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = SMALLER_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
lfsr_mount(&lfs, LFS_M_RDWR, &cfg) => 0;
// fsstat up to date?
@@ -441,7 +441,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -584,7 +584,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -815,7 +815,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -964,7 +964,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -1258,7 +1258,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -1682,7 +1682,7 @@ code = '''
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfs_t lfs;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -2214,7 +2214,7 @@ code = '''
// start with a small number of blocks
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;
@@ -2527,7 +2527,7 @@ code = '''
// start with a small number of blocks
struct lfs_config cfg = *CFG;
cfg.block_count = INIT_BLOCK_COUNT;
lfsr_format(&lfs, &cfg) => 0;
lfsr_format(&lfs, LFS_F_RDWR, &cfg) => 0;
// mount with maximum block count
lfsr_mount(&lfs, LFS_M_RDWR, CFG) => 0;