Christopher Haster
ffc565508a
Our flag space is already really packed, and I'm not sure having these
as separate flags is meaningful or useful for users. They both indicate
to repopulate allocators, and most users probably won't care that there
are two subtly different allocators operating under the hood.
There's an argument that LOOKAHEAD not touching disk is a useful
distinction, but in practice you really only need LOOKAHEAD work when
mounted RDWR.
So, merged the behaviors of LOOKAHEAD + LOOKGBMAP such that
LFS3_*_LOOKAHEAD requests repopulation of all allocators based on
gc_lookahead_thresh and gc_lookgbmap_thresh.
In priority order (some notes below):
1. If max(lookahead, gbmap) < gc_lookahead_thresh => repop lookahead
2. If gbmap < gc_lookgbmap_thresh => repop gbmap
As a plus, this makes it easier to avoid LFS3_IFDEF_GBMAP mess.
---
It's interesting to note LFS3_*_LOOKAHEAD will still repopulate the
lookahead buffer when the gbmap is present, but only if this would gain
more knowledge than was is currently in the gbmap.
I considered disabling lookahead scans completely when we have a gbmap,
but repopulating the lookahead buffer is still useful if the gbmap is at
risk of exhaustion. This is what gc_lookahead_thresh is for anyways, and
users can set gc_lookahead_thresh=0 if they want to disable this
behavior.
Relatedly, lookahead scans are actually prioritized over gbmap scans
(when they would gain knowledge). In theory this minimizes gc latency,
as gbmap scans risk triggering a full lookahead scan when building the
new gbmap.
---
Code changes minimal:
code stack ctx
before: 35152 2136 660
after: 35152 (+0.0%) 2136 (+0.0%) 660 (+0.0%)
code stack ctx
gbmap before: 38076 2136 776
gbmap after: 38080 (+0.0%) 2136 (+0.0%) 776 (+0.0%)
445 lines
17 KiB
Python
Executable File
445 lines
17 KiB
Python
Executable File
#!/usr/bin/env python3
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# prevent local imports
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if __name__ == "__main__":
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__import__('sys').path.pop(0)
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import collections as co
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import functools as ft
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# Flag prefixes
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PREFIX_O = ['+o', '+open'] # Filter by LFS3_O_* flags
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PREFIX_SEEK = ['+seek'] # Filter by LFS3_SEEK_* flags
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PREFIX_A = ['+a', '+attr'] # Filter by LFS3_A_* flags
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PREFIX_F = ['+f', '+format'] # Filter by LFS3_F_* flags
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PREFIX_M = ['+m', '+mount'] # Filter by LFS3_M_* flags
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PREFIX_CK = ['+ck'] # Filter by LFS3_CK_* flags
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PREFIX_GC = ['+gc'] # Filter by LFS3_GC_* flags
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PREFIX_I = ['+i', '+info'] # Filter by LFS3_I_* flags
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PREFIX_T = ['+t', '+trv'] # Filter by LFS3_T_* flags
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PREFIX_ALLOC = ['+alloc'] # Filter by LFS3_ALLOC_* flags
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PREFIX_RCOMPAT = ['+rc', '+rcompat'] # Filter by LFS3_RCOMPAT_* flags
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PREFIX_WCOMPAT = ['+wc', '+wcompat'] # Filter by LFS3_WCOMPAT_* flags
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PREFIX_OCOMPAT = ['+oc', '+ocompat'] # Filter by LFS3_OCOMPAT_* flags
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# File open flags
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O_MODE = 3 # -m The file's access mode
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O_RDONLY = 0 # -^ Open a file as read only
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O_WRONLY = 1 # -^ Open a file as write only
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O_RDWR = 2 # -^ Open a file as read and write
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O_CREAT = 0x00000004 # -- Create a file if it does not exist
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O_EXCL = 0x00000008 # -- Fail if a file already exists
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O_TRUNC = 0x00000010 # -- Truncate the existing file to zero size
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O_APPEND = 0x00000020 # -- Move to end of file on every write
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O_FLUSH = 0x00000040 # y- Flush data on every write
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O_SYNC = 0x00000080 # y- Sync metadata on every write
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O_DESYNC = 0x00100000 # -- Do not sync or recieve file updates
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O_CKMETA = 0x00010000 # -- Check metadata checksums
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O_CKDATA = 0x00020000 # -- Check metadata + data checksums
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o_WRSET = 3 # i- Open a file as an atomic write
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o_TYPE = 0xf0000000 # im The file's type
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o_REG = 0x10000000 # i^ Type = regular-file
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o_DIR = 0x20000000 # i^ Type = directory
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o_STICKYNOTE = 0x30000000 # i^ Type = stickynote
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o_BOOKMARK = 0x40000000 # i^ Type = bookmark
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o_ORPHAN = 0x50000000 # i^ Type = orphan
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o_TRAVERSAL = 0x60000000 # i^ Type = traversal
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o_UNKNOWN = 0x70000000 # i^ Type = unknown
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o_ZOMBIE = 0x08000000 # i- File has been removed
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o_UNCREAT = 0x04000000 # i- File does not exist yet
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o_UNSYNC = 0x02000000 # i- File's metadata does not match disk
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o_UNCRYST = 0x01000000 # i- File's leaf not fully crystallized
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o_UNGRAFT = 0x00800000 # i- File's leaf does not match disk
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o_UNFLUSH = 0x00400000 # i- File's cache does not match disk
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# File seek flags
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SEEK_MODE = 0xffffffff # -m Seek mode
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SEEK_SET = 0 # -^ Seek relative to an absolute position
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SEEK_CUR = 1 # -^ Seek relative to the current file position
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SEEK_END = 2 # -^ Seek relative to the end of the file
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# Custom attribute flags
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A_MODE = 3 # -m The attr's access mode
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A_RDONLY = 0 # -^ Open an attr as read only
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A_WRONLY = 1 # -^ Open an attr as write only
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A_RDWR = 2 # -^ Open an attr as read and write
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A_LAZY = 0x04 # -- Only write attr if file changed
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# Filesystem format flags
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F_MODE = 1 # -m Format's access mode
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F_RDWR = 0 # -^ Format the filesystem as read and write
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F_GBMAP = 0x02000000 # y- Use the global on-disk block-map
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F_REVDBG = 0x00000010 # y- Add debug info to revision counts
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F_REVNOISE = 0x00000020 # y- Add noise to revision counts
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F_CKPROGS = 0x00100000 # y- Check progs by reading back progged data
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F_CKFETCHES = 0x00200000 # y- Check block checksums before first use
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F_CKMETAPARITY = 0x00400000 # y- Check metadata tag parity bits
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F_CKDATACKSUMS = 0x01000000 # y- Check data checksums on reads
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F_MKCONSISTENT = 0x00000800 # y- Make the filesystem consistent
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F_LOOKAHEAD = 0x00001000 # y- Repopulate lookahead buffer
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F_COMPACTMETA = 0x00008000 # y- Compact metadata logs
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F_CKMETA = 0x00010000 # y- Check metadata checksums
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F_CKDATA = 0x00020000 # y- Check metadata + data checksums
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# Filesystem mount flags
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M_MODE = 1 # -m Mount's access mode
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M_RDWR = 0 # -^ Mount the filesystem as read and write
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M_RDONLY = 1 # -^ Mount the filesystem as read only
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M_FLUSH = 0x00000040 # y- Open all files with LFS3_O_FLUSH
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M_SYNC = 0x00000080 # y- Open all files with LFS3_O_SYNC
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M_REVDBG = 0x00000010 # y- Add debug info to revision counts
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M_REVNOISE = 0x00000020 # y- Add noise to revision counts
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M_CKPROGS = 0x00100000 # y- Check progs by reading back progged data
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M_CKFETCHES = 0x00200000 # y- Check block checksums before first use
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M_CKMETAPARITY = 0x00400000 # y- Check metadata tag parity bits
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M_CKDATACKSUMS = 0x01000000 # y- Check data checksums on reads
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M_MKCONSISTENT = 0x00000800 # y- Make the filesystem consistent
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M_LOOKAHEAD = 0x00001000 # y- Repopulate lookahead buffer
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M_COMPACTMETA = 0x00008000 # y- Compact metadata logs
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M_CKMETA = 0x00010000 # y- Check metadata checksums
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M_CKDATA = 0x00020000 # y- Check metadata + data checksums
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# File/filesystem check flags
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CK_MKCONSISTENT = 0x00000800 # -- Make the filesystem consistent
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CK_LOOKAHEAD = 0x00001000 # -- Repopulate lookahead buffer
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CK_COMPACTMETA = 0x00008000 # -- Compact metadata logs
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CK_CKMETA = 0x00010000 # -- Check metadata checksums
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CK_CKDATA = 0x00020000 # -- Check metadata + data checksums
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# GC flags
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GC_MKCONSISTENT = 0x00000800 # -- Make the filesystem consistent
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GC_LOOKAHEAD = 0x00001000 # -- Repopulate lookahead buffer
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GC_COMPACTMETA = 0x00008000 # -- Compact metadata logs
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GC_CKMETA = 0x00010000 # -- Check metadata checksums
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GC_CKDATA = 0x00020000 # -- Check metadata + data checksums
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# Filesystem info flags
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I_RDONLY = 0x00000001 # -- Mounted read only
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I_GBMAP = 0x02000000 # -- Global on-disk block-map in use
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I_FLUSH = 0x00000040 # -- Mounted with LFS3_M_FLUSH
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I_SYNC = 0x00000080 # -- Mounted with LFS3_M_SYNC
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I_REVDBG = 0x00000010 # -- Mounted with LFS3_M_REVDBG
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I_REVNOISE = 0x00000020 # -- Mounted with LFS3_M_REVNOISE
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I_CKPROGS = 0x00100000 # -- Mounted with LFS3_M_CKPROGS
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I_CKFETCHES = 0x00200000 # -- Mounted with LFS3_M_CKFETCHES
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I_CKMETAPARITY = 0x00400000 # -- Mounted with LFS3_M_CKMETAPARITY
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I_CKDATACKSUMS = 0x01000000 # -- Mounted with LFS3_M_CKDATACKSUMS
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I_MKCONSISTENT = 0x00000800 # -- Filesystem needs mkconsistent to write
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I_LOOKAHEAD = 0x00001000 # -- Lookahead buffer is not full
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I_COMPACTMETA = 0x00008000 # -- Filesystem may have uncompacted metadata
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I_CKMETA = 0x00010000 # -- Metadata checksums not checked recently
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I_CKDATA = 0x00020000 # -- Data checksums not checked recently
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# Traversal flags
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T_MODE = 1 # -m The traversal's access mode
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T_RDWR = 0 # -^ Open traversal as read and write
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T_RDONLY = 1 # -^ Open traversal as read only
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T_MTREEONLY = 0x00000002 # -- Only traverse the mtree
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T_EXCL = 0x00000008 # -- Error if filesystem modified
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T_MKCONSISTENT = 0x00000800 # -- Make the filesystem consistent
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T_LOOKAHEAD = 0x00001000 # -- Repopulate lookahead buffer
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T_COMPACTMETA = 0x00008000 # -- Compact metadata logs
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T_CKMETA = 0x00010000 # -- Check metadata checksums
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T_CKDATA = 0x00020000 # -- Check metadata + data checksums
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t_TYPE = 0xf0000000 # im The traversal's type
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t_REG = 0x10000000 # i^ Type = regular-file
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t_DIR = 0x20000000 # i^ Type = directory
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t_STICKYNOTE = 0x30000000 # i^ Type = stickynote
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t_BOOKMARK = 0x40000000 # i^ Type = bookmark
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t_ORPHAN = 0x50000000 # i^ Type = orphan
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t_TRAVERSAL = 0x60000000 # i^ Type = traversal
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t_UNKNOWN = 0x70000000 # i^ Type = unknown
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t_BTYPE = 0x00f00000 # im The current block type
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t_MDIR = 0x00100000 # i^ Btype = mdir
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t_BTREE = 0x00200000 # i^ Btype = btree
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t_DATA = 0x00300000 # i^ Btype = data
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t_ZOMBIE = 0x08000000 # i- File has been removed
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t_CKPOINTED = 0x04000000 # i- Filesystem ckpointed during traversal
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t_DIRTY = 0x02000000 # i- Filesystem ckpointed outside traversal
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t_STALE = 0x01000000 # i- Block queue probably out-of-date
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# Block allocator flags
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alloc_ERASE = 0x00000001 # i- Please erase the block
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# Read-compat flags
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RCOMPAT_NONSTANDARD = 0x00000001 # -- Non-standard filesystem format
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RCOMPAT_WRONLY = 0x00000004 # -- Reading is disallowed
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RCOMPAT_MMOSS = 0x00000010 # -- May use an inlined mdir
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RCOMPAT_MSPROUT = 0x00000020 # -- May use an mdir pointer
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RCOMPAT_MSHRUB = 0x00000040 # -- May use an inlined mtree
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RCOMPAT_MTREE = 0x00000080 # -- May use an mdir btree
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RCOMPAT_BMOSS = 0x00000100 # -- Files may use inlined data
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RCOMPAT_BSPROUT = 0x00000200 # -- Files may use block pointers
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RCOMPAT_BSHRUB = 0x00000400 # -- Files may use inlined btrees
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RCOMPAT_BTREE = 0x00000800 # -- Files may use btrees
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RCOMPAT_GRM = 0x00010000 # -- Global-remove in use
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rcompat_OVERFLOW = 0x80000000 # i- Can't represent all flags
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# Write-compat flags
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WCOMPAT_NONSTANDARD = 0x00000001 # -- Non-standard filesystem format
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WCOMPAT_RDONLY = 0x00000002 # -- Writing is disallowed
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WCOMPAT_GCKSUM = 0x00040000 # -- Global-checksum in use
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WCOMPAT_GBMAP = 0x00080000 # -- Global on-disk block-map in use
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WCOMPAT_DIR = 0x01000000 # -- Directory file types in use
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wcompat_OVERFLOW = 0x80000000 # i- Can't represent all flags
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# Optional-compat flags
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OCOMPAT_NONSTANDARD = 0x00000001 # -- Non-standard filesystem format
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ocompat_OVERFLOW = 0x80000000 # i- Can't represent all flags
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# self-parsing prefixes
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class Prefix:
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def __init__(self, name, aliases, help):
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self.name = name
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self.aliases = aliases
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self.help = help
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def __repr__(self):
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return 'Prefix(%r, %r, %r)' % (
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self.name,
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self.aliases,
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self.help)
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def __eq__(self, other):
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return self.name == other.name
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def __ne__(self, other):
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return self.name != other.name
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def __hash__(self):
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return hash(self.name)
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@staticmethod
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@ft.cache
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def prefixes():
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# parse our script's source to figure out prefixes
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import inspect
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import re
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prefixes = []
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prefix_pattern = re.compile(
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'^(?P<name>PREFIX_[^ ]*) *= *(?P<aliases>[^#]*?) *'
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'#+ *(?P<help>.*)$')
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for line in (inspect.getsource(
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inspect.getmodule(inspect.currentframe()))
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.replace('\\\n', '')
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.splitlines()):
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m = prefix_pattern.match(line)
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if m:
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prefixes.append(Prefix(
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m.group('name'),
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globals()[m.group('name')],
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m.group('help')))
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return prefixes
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# self-parsing flags
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class Flag:
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def __init__(self, name, flag, help, *,
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prefix=None,
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yes=False,
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internal=False,
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mask=False,
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type=False):
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self.name = name
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self.flag = flag
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self.help = help
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self.prefix = prefix
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self.yes = yes
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self.internal = internal
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self.mask = mask
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self.type = type
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def __repr__(self):
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return 'Flag(%r, %r, %r)' % (
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self.name,
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self.flag,
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self.help)
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def __eq__(self, other):
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return self.name == other.name
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def __ne__(self, other):
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return self.name != other.name
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def __hash__(self):
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return hash(self.name)
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def line(self):
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return ('LFS3_%s' % self.name, '0x%08x' % self.flag, self.help)
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@staticmethod
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@ft.cache
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def flags():
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# parse our script's source to figure out flags
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import inspect
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import re
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# limit to known prefixes
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prefixes_ = {p.name.split('_', 1)[1].upper(): p
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for p in Prefix.prefixes()}
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# keep track of last mask
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mask_ = None
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flags = []
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flag_pattern = re.compile(
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'^(?P<name>(?i:%s)_[^ ]*) '
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'*= *(?P<flag>[^#]*?) *'
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'#+ (?P<mode>[^ ]+) *(?P<help>.*)$'
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% '|'.join(prefixes_.keys()))
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for line in (inspect.getsource(
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inspect.getmodule(inspect.currentframe()))
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.replace('\\\n', '')
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.splitlines()):
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m = flag_pattern.match(line)
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if m:
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flags.append(Flag(
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m.group('name'),
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globals()[m.group('name')],
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m.group('help'),
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# associate flags -> prefix
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prefix=prefixes_[
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m.group('name').split('_', 1)[0].upper()],
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yes='y' in m.group('mode'),
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internal='i' in m.group('mode'),
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mask='m' in m.group('mode'),
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# associate types -> mask
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type=mask_ if '^' in m.group('mode') else False))
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# keep track of last mask
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if flags[-1].mask:
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mask_ = flags[-1]
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return flags
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def main(flags, *,
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list=False,
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all=False,
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prefixes=[]):
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import builtins
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list_, list = list, builtins.list
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all_, all = all, builtins.all
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# find flags
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flags__ = Flag.flags()
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# filter by prefixes if there are any prefixes
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if prefixes:
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prefixes = set(prefixes)
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flags__ = [f for f in flags__ if f.prefix in prefixes]
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lines = []
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# list all known flags
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if list_:
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for f in flags__:
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if not all_ and (f.internal or f.type):
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continue
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lines.append(f.line())
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# find flags by name or value
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else:
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for f_ in flags:
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found = False
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# find by LFS3_+prefix+_+name
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for f in flags__:
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if 'LFS3_%s' % f.name.upper() == f_.upper():
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lines.append(f.line())
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found = True
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if found:
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continue
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# find by prefix+_+name
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for f in flags__:
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if '%s' % f.name.upper() == f_.upper():
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lines.append(f.line())
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found = True
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if found:
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continue
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# find by name
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for f in flags__:
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if f.name.split('_', 1)[1].upper() == f_.upper():
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lines.append(f.line())
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found = True
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if found:
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continue
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# find by value
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try:
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f__ = int(f_, 0)
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f___ = f__
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for f in flags__:
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# ignore type masks here
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if f.mask:
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continue
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# matches flag?
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if not f.type and (f__ & f.flag) == f.flag:
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lines.append(f.line())
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f___ &= ~f.flag
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# matches type?
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elif f.type and (f__ & f.type.flag) == f.flag:
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lines.append(f.line())
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f___ &= ~f.type.flag
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if f___:
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lines.append(('?', '0x%08x' % f___, 'Unknown flags'))
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except ValueError:
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lines.append(('?', f_, 'Unknown flag'))
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# first find widths
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w = [0, 0]
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for l in lines:
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w[0] = max(w[0], len(l[0]))
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w[1] = max(w[1], len(l[1]))
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# then print results
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for l in lines:
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print('%-*s %-*s %s' % (
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w[0], l[0],
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w[1], l[1],
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l[2]))
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if __name__ == "__main__":
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import argparse
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import sys
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parser = argparse.ArgumentParser(
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description="Decode littlefs flags.",
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allow_abbrev=False,
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# allow + for prefix filters
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prefix_chars='-+')
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parser.add_argument(
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'flags',
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nargs='*',
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help="Flags or names of flags to decode.")
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parser.add_argument(
|
|
'-l', '--list',
|
|
action='store_true',
|
|
help="List all known flags.")
|
|
parser.add_argument(
|
|
'-a', '--all',
|
|
action='store_true',
|
|
help="Also show internal flags and types.")
|
|
class AppendPrefix(argparse.Action):
|
|
def __init__(self, nargs=None, **kwargs):
|
|
super().__init__(nargs=0, **kwargs)
|
|
def __call__(self, parser, namespace, value, option):
|
|
if getattr(namespace, 'prefixes', None) is None:
|
|
namespace.prefixes = []
|
|
namespace.prefixes.append(self.const)
|
|
for p in Prefix.prefixes():
|
|
parser.add_argument(
|
|
*p.aliases,
|
|
action=AppendPrefix,
|
|
const=p,
|
|
help=p.help+'.')
|
|
sys.exit(main(**{k: v
|
|
for k, v in vars(parser.parse_intermixed_args()).items()
|
|
if v is not None}))
|