Reorganized traversal flags again
One nice thing about merging LOOKAHEAD + LOOKGBMAP, is now our core
traversal flags fit in a single byte. This is useful for organizing
things, especially so as the traversal flags seem to permeate into
basically every flag set.
The main change was to actually group these flags into a byte, which
helps readability and in theory could make some bulk accesses cheaper
(in practice I don't think we currently leverage this):
T_MODE 0x00000001 ---- ---- ---- ---- ---- ---- ---- ---1
T_RDONLY 0x00000000 ---- ---- ---- ---- ---- ---- ---- ----
T_RDWR 0x00000001 ---- ---- ---- ---- ---- ---- ---- ---1
T_MTREEONLY 0x00000002 ---- ---- ---- ---- ---- ---- ---- --1-
T_EXCL 0x00000008 ---- ---- ---- ---- ---- ---- ---- 1---
T_MKCONSISTENT 0x00000100 ---- ---- ---- ---- ---- ---1 ---- ----
T_LOOKAHEAD 0x00000200 ---- ---- ---- ---- ---- --1- ---- ----
T_PREERASE* 0x00000400 ---- ---- ---- ---- ---- -1-- ---- ----
T_COMPACT 0x00000800 ---- ---- ---- ---- ---- 1--- ---- ----
T_CKMETA 0x00001000 ---- ---- ---- ---- ---1 ---- ---- ----
T_CKDATA 0x00002000 ---- ---- ---- ---- --1- ---- ---- ----
T_REPAIRMETA* 0x00004000 ---- ---- ---- ---- -1-- ---- ---- ----
T_REPAIRDATA* 0x00008000 ---- ---- ---- ---- 1--- ---- ---- ----
t_EVICT* 0x00000010 ---- ---- ---- ---- ---- ---- ---1 ----
t_TYPE 0xf0000000 1111 ---- ---- ---- ---- ---- ---- ----
t_ZOMBIE 0x08000000 ---- 1--- ---- ---- ---- ---- ---- ----
t_CKPOINTED 0x04000000 ---- -1-- ---- ---- ---- ---- ---- ----
t_DIRTY 0x02000000 ---- --1- ---- ---- ---- ---- ---- ----
t_STALE 0x01000000 ---- ---1 ---- ---- ---- ---- ---- ----
t_BTYPE 0x00ff0000 ---- ---- 1111 1111 ---- ---- ---- ----
* Planned
This gives btype a full byte as well, which is a bit overkill, but can
be reduced in the future if we run into traversal flag pressure.
This also pushes some future planned flags (DEDUP, COMPR, etc) into
higher-order bits, but that's not the end of the world.
Code changes basically nothing:
code stack ctx
before: 35152 2136 660
after: 35152 (+0.0%) 2136 (+0.0%) 660 (+0.0%)
code stack ctx
gbmap before: 38080 2136 776
gbmap after: 38076 (-0.0%) 2136 (+0.0%) 776 (+0.0%)
This commit is contained in:
Christopher Haster
@@ -140,8 +140,8 @@ enum lfs3_type {
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#define LFS3_O_FLUSH 0x00000040 // Flush data on every write
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#define LFS3_O_SYNC 0x00000080 // Sync metadata on every write
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#define LFS3_O_DESYNC 0x00100000 // Do not sync or recieve file updates
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#define LFS3_O_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_O_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_O_CKMETA 0x00001000 // Check metadata checksums
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#define LFS3_O_CKDATA 0x00002000 // Check metadata + data checksums
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// internally used flags, don't use these
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#define LFS3_o_WRSET 3 // Open a file as an atomic write
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@@ -202,20 +202,20 @@ enum lfs3_type {
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_F_MKCONSISTENT \
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0x00000800 // Make the filesystem consistent
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0x00000100 // Make the filesystem consistent
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_F_LOOKAHEAD \
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0x00001000 // Repopulate lookahead/gbmap
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0x00000200 // Repopulate lookahead/gbmap
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_F_COMPACT 0x00008000 // Compact metadata logs
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#define LFS3_F_COMPACT 0x00000800 // Compact metadata logs
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_F_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_F_CKMETA 0x00001000 // Check metadata checksums
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_F_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_F_CKDATA 0x00002000 // Check metadata + data checksums
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#endif
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// Filesystem mount flags
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@@ -249,17 +249,17 @@ enum lfs3_type {
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_M_MKCONSISTENT \
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0x00000800 // Make the filesystem consistent
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0x00000100 // Make the filesystem consistent
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_M_LOOKAHEAD \
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0x00001000 // Repopulate lookahead/gbmap
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0x00000200 // Repopulate lookahead/gbmap
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_M_COMPACT 0x00008000 // Compact metadata logs
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#define LFS3_M_COMPACT 0x00000800 // Compact metadata logs
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#endif
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#define LFS3_M_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_M_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_M_CKMETA 0x00001000 // Check metadata checksums
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#define LFS3_M_CKDATA 0x00002000 // Check metadata + data checksums
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// Filesystem info flags
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#define LFS3_I_RDONLY 0x00000001 // Mounted read only
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@@ -291,17 +291,17 @@ enum lfs3_type {
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_I_MKCONSISTENT \
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0x00000800 // Filesystem needs mkconsistent to write
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0x00000100 // Filesystem needs mkconsistent to write
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_I_LOOKAHEAD \
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0x00001000 // Lookahead/gbmap is not full
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0x00000200 // Lookahead/gbmap is not full
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_I_COMPACT 0x00008000 // Filesystem may have uncompacted metadata
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#define LFS3_I_COMPACT 0x00000800 // Filesystem may have uncompacted metadata
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#endif
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#define LFS3_I_CKMETA 0x00010000 // Metadata checksums not checked recently
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#define LFS3_I_CKDATA 0x00020000 // Data checksums not checked recently
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#define LFS3_I_CKMETA 0x00001000 // Metadata checksums not checked recently
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#define LFS3_I_CKDATA 0x00002000 // Data checksums not checked recently
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// Block types
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enum lfs3_btype {
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@@ -321,21 +321,21 @@ enum lfs3_btype {
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#define LFS3_T_EXCL 0x00000008 // Error if filesystem modified
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#ifndef LFS3_RDONLY
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#define LFS3_T_MKCONSISTENT \
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0x00000800 // Make the filesystem consistent
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0x00000100 // Make the filesystem consistent
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_T_LOOKAHEAD \
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0x00001000 // Repopulate lookahead/gbmap
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0x00000200 // Repopulate lookahead/gbmap
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_T_COMPACT 0x00008000 // Compact metadata logs
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#define LFS3_T_COMPACT 0x00000800 // Compact metadata logs
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#endif
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#define LFS3_T_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_T_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_T_CKMETA 0x00001000 // Check metadata checksums
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#define LFS3_T_CKDATA 0x00002000 // Check metadata + data checksums
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// internally used flags, don't use these
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#define LFS3_t_TYPE 0xf0000000 // The traversal's type
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#define LFS3_t_BTYPE 0x00f00000 // The current block type
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#define LFS3_t_BTYPE 0x00ff0000 // The current block type
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#define LFS3_t_ZOMBIE 0x08000000 // File has been removed
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#define LFS3_t_CKPOINTED \
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0x04000000 // Filesystem ckpointed during traversal
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@@ -345,32 +345,32 @@ enum lfs3_btype {
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// File/filesystem check flags
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#ifndef LFS3_RDONLY
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#define LFS3_CK_MKCONSISTENT \
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0x00000800 // Make the filesystem consistent
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0x00000100 // Make the filesystem consistent
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_CK_LOOKAHEAD \
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0x00001000 // Repopulate lookahead/gbmap
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0x00000200 // Repopulate lookahead/gbmap
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_CK_COMPACT 0x00008000 // Compact metadata logs
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#define LFS3_CK_COMPACT 0x00000800 // Compact metadata logs
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#endif
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#define LFS3_CK_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_CK_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_CK_CKMETA 0x00001000 // Check metadata checksums
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#define LFS3_CK_CKDATA 0x00002000 // Check metadata + data checksums
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// GC flags
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#ifndef LFS3_RDONLY
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#define LFS3_GC_MKCONSISTENT \
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0x00000800 // Make the filesystem consistent
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0x00000100 // Make the filesystem consistent
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_GC_LOOKAHEAD \
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0x00001000 // Repopulate lookahead/gbmap
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0x00000200 // Repopulate lookahead/gbmap
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#endif
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#ifndef LFS3_RDONLY
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#define LFS3_GC_COMPACT 0x00008000 // Compact metadata logs
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#define LFS3_GC_COMPACT 0x00000800 // Compact metadata logs
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#endif
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#define LFS3_GC_CKMETA 0x00010000 // Check metadata checksums
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#define LFS3_GC_CKDATA 0x00020000 // Check metadata + data checksums
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#define LFS3_GC_CKMETA 0x00001000 // Check metadata checksums
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#define LFS3_GC_CKDATA 0x00002000 // Check metadata + data checksums
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// an alias for all possible GC work
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#define LFS3_GC_ALL ( \
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