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|
import logging, os, errno, fcntl, fuse, FuseArchive, copy
import FuseArchive.Storage.ZipFile, FuseArchive.Storage.FileSystem
from binascii import hexlify
from FuseArchive.Serializer import Serializer
from ChunkBuffer import ChunkBuffer
# These control some of the file output
magic_blocksize = 1024 * 1024 * 5
# Use a tiny block size to debug writes, so you can use a smaller test file
#magic_blocksize = 1024
chunkstyle = 'fs'
# This is the number of actualy blocks in that size
dirty_flush = 5 * magic_blocksize
# This is a cache of open files by inode, to fix the lseek == size problem
# this causes a failure in fsx-linux becuase to to lseek(fd,0,seek_end) it
# apparently does a getattr to find the file length then subtracts the
# offset from that to pass to write or whatever, since the offset is passed
# to write and we don't maintain one internally. xmp.py also fails this
# test.
dirty_cache = {}
def flag2mode(flags):
md = {os.O_RDONLY: 'r', os.O_WRONLY: 'w', os.O_RDWR: 'w+'}
m = md[flags & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR)]
if flags & os.O_APPEND:
m = m.replace('w', 'a', 1)
return m
if chunkstyle == 'fs':
load_chunk = FuseArchive.Storage.FileSystem.load_chunk
save_chunk = FuseArchive.Storage.FileSystem.save_chunk
lock_chunk = FuseArchive.Storage.FileSystem.lock_chunk
unlock_chunk = FuseArchive.Storage.FileSystem.unlock_chunk
elif chunkstyle == 'zip':
raise ValueException( "Zip storage doesn't support lock/unlock, make an inteface!" )
load_chunk = FuseArchive.Storage.ZipFile.load_chunk
save_chunk = FuseArchive.Storage.ZipFile.save_chunk
else:
raise ValueException( 'Invalid chunk style' )
class FuseArchiveStat(fuse.Stat):
def __init__(self, stat):
self.st_mode = stat.st_mode
self.st_ino = stat.st_ino
self.st_dev = stat.st_dev
self.st_rdev = stat.st_rdev
self.st_nlink = stat.st_nlink
self.st_uid = stat.st_uid
self.st_gid = stat.st_gid
self.st_size = stat.st_size
self.st_atime = stat.st_atime
self.st_mtime = stat.st_mtime
self.st_ctime = stat.st_mtime
self.st_blocks = stat.st_blocks
self.st_blksize = stat.st_blksize
def overstat( self, size ):
self.st_size = size
# Yeah we shouldn't always just add 1
self.st_blocks = int( self.st_size / 512 ) + 1
class ChunkFile(object):
def __init__(self, path, flags, *mode):
# Inflate the file
logging.debug( "Init file: " + path )
self.orig_path = path
# init rw and offset
self.rd = False
self.wr = False
self.size = 0
self.modified = False
# This is the current in-memory chunk and offset in to data[]
self.chunk_cache = {}
self.chunk = ChunkBuffer()
self.chunk_index = -1
self.chunk_modified = False
self.chunk_size = magic_blocksize
self.dirty_chunks = 0
# The chunk table
self.chunks = []
# Because python is bizarre and you magically define attributes in
# the constructor we predefine this here for the case where we
# fflush early if we're creating a new file since we reference this
# attribute in the routine. At least it gets initialized I guess
self.original_chunks = []
self.original_key = None
# TODO: Better flag handling here?
if flags & os.O_RDONLY:
self.rd = True
if flags & os.O_RDWR:
self.rd = True
self.wr = True
if flags & os.O_WRONLY:
self.wr = True
if flags & os.O_APPEND:
self.wr = True
if os.path.exists( "./tree" + self.orig_path ):
preexist = True
else:
preexist = False
# Open the file now and keep the fh around so that cp -a on r/o
# files works (in the create a read-only file for writing case)
src = "./tree" + path
logging.debug( "Saving fh for " + src )
nflags = os.O_RDWR | os.O_APPEND
if flags & os.O_CREAT:
logging.debug( "Adding O_CREAT" )
nflags = nflags | os.O_CREAT
self.file = os.fdopen( os.open( src, nflags, *mode ),
flag2mode( nflags ) )
if preexist:
# Read in file info table
logging.debug( "Unpickling: %s" % self.file )
# TODO: return an IO error if inflating fails
try:
magic = Serializer.loadfh( self.file )
logging.debug( "Got data: %s" % magic )
# This is just a key to a block to minimize complete
# duplicates
logging.debug( "Reading chunk to get actual file data" )
self.original_key = magic
file_chunk = load_chunk( magic )
magic = Serializer.loads( file_chunk )
self.size = magic[ 'size' ]
self.chunks = magic[ 'chunks' ]
self.chunk_size = magic[ 'chunk_size' ]
logging.debug( "Loaded size: %d, chunk size: %d, chunks: %d" %
( self.size, self.chunk_size, len( self.chunks ) ) )
except Exception, e:
logging.critical( self.orig_path + ": " + str( e ) )
else:
if self.wr:
logging.debug( "File doesn't exist and we're going to write, creating temp empty file" )
self.modified = True
self.flush()
self.direct_io = False
self.keep_cache = False
self.original_chunks = copy.deepcopy( self.chunks )
logging.debug( "%s init complete" % self )
def _load_chunk( self, index ):
# If the current chunk is the same as the chunk we're loading
# just return
logging.debug( "_load_chunk: %d" % index )
if index == self.chunk_index:
logging.debug( "Load chunk is same as current chunk, all done" )
return
# Save this chunk if modified
self._save_chunk()
logging.debug( "Loading chunk %d" % index )
key = None
size = len( self.chunks )
if index >= size:
logging.debug( "Index doesn't exist" )
else:
key = self.chunks[ index ]
if key:
if isinstance( key, ChunkBuffer ):
logging.debug( "Found cached dirty page" )
self.chunk = key
else:
logging.debug( "Index: %s" % key )
self.chunk = ChunkBuffer( load_chunk( key ) )
else:
logging.debug( "No chunk at this index, loading nothing" )
self.chunk = ChunkBuffer()
logging.debug( "Loaded chunk of length: %d" % self.chunk.length() )
self.chunk_index = index
self.chunk_modified = False
# This simply puts the chunk data inside our current chunks at chunk_index
def _save_chunk(self):
if self.chunk_modified:
logging.debug( "Saving chunk %d" % self.chunk_index )
# Make sure we have room for this chunk
size = len( self.chunks )
if self.chunk_index >= size:
self.chunks.extend( [ ChunkBuffer() ] * ( self.chunk_index -size + 1 ) )
# Increment dirty chunks if we had a key here already
logging.debug( "Chunk is: %s" % self.chunks[ self.chunk_index ] );
if isinstance( self.chunks[ self.chunk_index ], list ) or \
self.chunks[ self.chunk_index ].length() == 0:
self.dirty_chunks += 1
logging.debug( "Dirty chunks is now: %d" % self.dirty_chunks )
logging.debug( "Dirty flush at: %d" % dirty_flush )
# Save the dirty chunk temporarily in memory
self.chunks[ self.chunk_index ] = self.chunk
# Flush if we have too many dirty chunks
if self.dirty_chunks >= dirty_flush:
self._flush_chunks()
# This flushes any cached chunks
def _flush_chunks(self):
for index in range( len( self.chunks ) ):
if isinstance( self.chunks[ index ], ChunkBuffer ):
logging.debug( "Flushing chunk at %d" % index )
key = save_chunk( self.chunks[ index ].string() )
self.chunks[ index ] = key
logging.debug( "Key was %s" % key )
self.dirty_chunks = 0
# If we had an old chunk here, free it
if len(self.original_chunks) >= index + 1:
oldkey = self.original_chunks[ index ]
if oldkey != key:
# Free this chunk
unlock_chunk( oldkey )
# And keep this chunk
lock_chunk( key )
# Else chunk didn't change, don't relock or anything
else:
# We did not have a chunk here so lock this chunk
lock_chunk( key )
# And extend original chunks by 1 (we are walking
# sequentially so we don't need to worry about padding
# out intermediate chunks)
self.original_chunks.extend( [ ChunkBuffer() ] )
# And update the key in original chunks
self.original_chunks[ index ] = key
#self._update_chunk_references()
def read(self, length, offset):
logging.debug( "Reading from %s offset: %d (0x%x) length: %d (0x%d)" %
( self.orig_path, offset, offset, length, length ) )
data_read = 0
data = ''
index = int( offset / self.chunk_size )
rest = offset % self.chunk_size
is_eof = False
# Keep reading chunks until we have at least this much data
while data_read < length and not is_eof:
logging.debug( "Pulling chunk data: %d" % index )
self._load_chunk( index )
if self.chunk.length():
chunk_remaining = self.chunk.length() - rest
to_read = chunk_remaining
data_left = length - data_read
if data_left < chunk_remaining:
to_read = data_left
logging.debug( "chunk_remaining: %d" % chunk_remaining )
logging.debug( "data_left: %d" % data_left )
logging.debug( "data_read: %d" % data_read )
logging.debug( "rest: %d" % rest )
logging.debug( "Copying %d bytes" % to_read )
data += self.chunk.string()[ rest:(rest+to_read) ]
data_read += to_read
index += 1
rest = 0
else:
logging.debug( "No more chunk data, bye" )
is_eof = True
logging.debug( "Returning %d bytes of data" % len( data ) )
logging.debug( "Internal count was: %d" % data_read )
return data
def write(self, buf, offset):
if FuseArchive.magic_profiling:
return len( buf )
logging.debug( "Writing to %s offset: %d (0x%x) length: %d (0x%x)" %
( self.orig_path, offset, offset, len( buf ), len( buf ) ) )
index = int( offset / self.chunk_size )
rest = offset % self.chunk_size
logging.debug( "This chunk falls on index: %d rest: %d" % ( index, rest ) )
logging.debug( "We have %d chunks" % len( self.chunks ) )
logging.debug( "File size is: %d" % self.size )
# If index is higher than the number of blocks we current have it's a seek hole, so we need to extend our blocks out
# We know these need to essentially be zeroed up to this size since
if len( self.chunks ) - 1 < index:
logging.debug( "Not enough chunks %d, need %d, extending" %
( len( self.chunks ), index + 1 ) )
# Start with our last block, in case we need to null pad it out
this_index = len( self.chunks ) - 1
if this_index < 0:
this_index = 0
while this_index < index:
self._load_chunk( this_index )
fill_null = self.chunk_size - self.chunk.length()
logging.debug( "Filling this chunk with null, bytes: %d" % fill_null )
self.chunk.append( "\0" * fill_null )
logging.debug( "Chunk is now: %d bytes" % self.chunk.length() )
self.chunk_modified = True
self._save_chunk()
this_index += 1
self._load_chunk( index )
if self.chunk.length() < rest:
fill_null = rest - self.chunk.length()
logging.debug( "Filling final chunk with null, bytes: %d" % fill_null )
self.chunk.append( "\0" * fill_null )
self.chunk_modified = True
self._save_chunk()
buf_offset = 0
buf_len = len(buf)
logging.debug( "Length: %d" % buf_len )
while( buf_offset < buf_len ):
logging.debug( "Pulling in chunk for writing: %d" % index )
self._load_chunk( index )
buf_remain = buf_len - buf_offset
chunk_remain = self.chunk_size - rest
logging.debug( "buf_remain: %d" % buf_remain )
logging.debug( "chunk_remain: %d" % chunk_remain )
if chunk_remain < buf_remain:
logging.debug( "Writing %d bytes, buffer boundry" % chunk_remain )
this_len = chunk_remain
else:
logging.debug( "Writing final %d bytes" % buf_remain )
this_len = buf_remain
logging.debug( "Bytes to copy: %d" % this_len )
logging.debug( " buf offset: %d" % buf_offset )
logging.debug( " chunk offset: %d" % rest )
if FuseArchive.deep_debug:
logging.debug( "Pre-Buf: %s" % hexlify(buf) )
logging.debug( "Pre-Chunk: %s" % hexlify(self.chunk) )
# Check if we are appending only, appends are much faster than
# splicing up string
if self.chunk.length() == rest and len( buf ) <= this_len:
logging.debug( "Doing quick append" )
self.chunk.append( buf )
else:
logging.debug( "SLOOOOW! Doing string splice" )
# Since python doesn't do in-place reassignment like you
# can with splice() we will reconstruct the data by joining
# stuff by offsets (first chars to skip, then our joining
# buf chunk, the everything that would have been after it)
# This sucks for moving around data, it is very slow!
self.chunk.replace( buf[ buf_offset:(buf_offset+this_len) ],
rest, rest + this_len )
if FuseArchive.deep_debug:
logging.debug( "Post-Buf: %s" % hexlify(buf) )
logging.debug( "Post-Chunk: %s" % hexlify(self.chunk) )
buf_offset += this_len
# Advance to next block
rest = 0
index += 1
self.chunk_modified = True
self._save_chunk()
self.modified = True
if offset + len(buf) > self.size:
self.size = offset + len(buf)
logging.debug( "This chunk size is now: %d" % self.chunk.length() )
logging.debug( "File size is now: %d" % self.size )
logging.debug( "Num Chunks: %d" % len( self.chunks ) )
# Mark us in the dirty cache
dirty_cache[ self.orig_path ] = self
return len(buf)
# BUG: If you cp -a a file then quickly ls -l sometimes it doesn't show
# up right? like wrong size and stuff?
# Maybe because release doesn't return a fuse message and is async?
def release(self, flags):
# Deflate the file
logging.debug( "Release: " + self.orig_path )
self.flush()
self.file.close()
def _fflush(self):
if self.wr and self.modified:
logging.debug( "_fflush!" )
# Save our main data
self._save_chunk()
# And flush any cached chunks
self._flush_chunks()
save_size = self.size
# Figure out our size based on the number of chunks + the
# len of the final chunk
numchunks = len( self.chunks )
if numchunks > 0:
# Load the last chunk
logging.debug( "We have %d chunks, calculating size" % numchunks )
self._load_chunk( numchunks - 1 )
self.size = ( numchunks - 1 ) * self.chunk_size + \
self.chunk.length()
else:
logging.debug( "No chunks, setting size to zero" )
self.size = 0
# If this assert fails then write/ftruncate failed to set
# things up right somewhere
assert save_size == self.size, "Calculated size of " \
+ self.orig_path + " = " + str( self.size ) \
+ " doesn't match internal size " + str( save_size ) \
+ "\nProbably a bug in write or ftruncate!"
logging.debug( "Size calculated is: %d (0x%x)" % ( self.size, self.size ) )
key = save_chunk( Serializer.dumps( {
'size': self.size,
'chunks': self.chunks,
'chunk_size': self.chunk_size
} ) )
logging.debug( "Saved indirect file to key %s, saving key in main file" % key )
Serializer.dumpfh( self.file, key )
# Update file ref counts
if key != self.original_key:
logging.debug( "File key changed updating references" )
if self.original_key != None:
unlock_chunk( self.original_key )
lock_chunk( key )
self.original_key = key
self._update_chunk_references()
# Not dirty anymore
if self.orig_path in dirty_cache:
del dirty_cache[ self.orig_path ]
logging.debug( "_fflush exit" )
return 1
def _update_chunk_references(self):
# Now update our chunk ref counts
logging.debug( "Updating chunk references" )
for index in range( len( self.chunks ) ):
# Is this chunk changed from what was here before?
oldkey = None
key = self.chunks[ index ]
changed = False
# Is the old chunks at least this big?
if index >= len( self.original_chunks ):
logging.debug( "No old chunk at this spot, changed for sure" )
changed = True
else:
oldkey = self.original_chunks[ index ]
if oldkey != key:
logging.debug( "Key has changed at index %d" % index )
changed = True
logging.debug( "%s is now %s" % (oldkey, key) )
if changed:
logging.debug( "Chunk at index %d has changed" % index )
if oldkey != None:
unlock_chunk( oldkey )
lock_chunk( key )
# Free any unused chunks because of ftruncate
logging.debug( "Freeing chunks beyond our new chunk count" )
index = len( self.chunks )
while index < len( self.original_chunks ):
logging.debug( "Unlocking chunk at index %d" % index )
unlock_chunk( self.original_chunks[ index ] )
index += 1
# Update our original_chunks since we've locked/unlocked some
# things
self.original_chunks = copy.deepcopy( self.chunks )
def pre_unlink(self):
# Release all our blocks and our main file key
logging.debug( "Unlocking all our chunks for unlink" )
for key in self.chunks:
unlock_chunk( key )
unlock_chunk( self.original_key )
# Currently we treat fsync as flush since we don't keep any data
# hanging around anyway in fh stuff
def fsync(self, isfsyncfile):
logging.debug( "fsync " + self.orig_path )
self._fflush()
#if isfsyncfile and hasattr(os, 'fdatasync'):
# os.fdatasync(self.fd)
#else:
# os.fsync(self.fd)
def flush(self):
logging.debug( "flush " + self.orig_path )
self._fflush()
def fgetattr(self):
logging.debug( "Overridding fgetattr" )
stats = FuseArchiveStat( os.lstat( "./tree" + self.orig_path ) )
# Fixed in write?
#if self.modified:
# We would need to fsync here to recalc size, but don't do
# it unless modified? otherwise simple getattr will be
# rewriting a ton of files
# print "WARNING: self.modified causes fgetattr to be incorrect!"
stats.overstat( self.size )
return stats
def ftruncate(self, length):
if not self.wr:
return errno.IOError
curr_chunks = len( self.chunks )
need_chunks = ( length / self.chunk_size )
extra_bytes = length % self.chunk_size
logging.debug( "Ftruncate - %d (0x%x)" % ( length, length ) )
logging.debug( " - self.size: %d" % self.size )
logging.debug( " - curr_chunks: %d" % curr_chunks )
logging.debug( " - need_chunks: %d" % need_chunks )
logging.debug( " - extra_bytes: %d" % extra_bytes )
if extra_bytes:
logging.debug( "Need an extra chunk" )
need_chunks += 1
self._load_chunk( 0 )
if length == 0:
logging.debug( "Creating 0 chunk file" )
self.chunks = []
self.chunk = ChunkBuffer()
elif self.size <= length:
logging.debug( "Need to pad out file, writing/seeking to %d" % length )
# Just write out null bytes to the length requested, write will do this for us if we specify the offset
self.write( '', length )
else:
logging.debug( "Truncating chunks" )
while True:
logging.debug( "Need chunks: %d curr: %d" % ( need_chunks, curr_chunks ) )
if need_chunks == curr_chunks:
break
logging.debug( "Deleting chunk %d" % self.chunk_index )
self.chunks.pop()
curr_chunks = len( self.chunks )
# Now make sure this chunk is the right size, first load the
# last chunk
if len( self.chunks ):
self._load_chunk( len( self.chunks ) - 1 )
logging.debug( "Loaded final chunk, len: %d" % self.chunk.length() )
# Now truncate this item if needed
if self.chunk.length() > extra_bytes:
logging.debug( "Truncating final chunk to %d" % extra_bytes )
self.chunk.truncate( extra_bytes )
logging.debug( "Chunk is now: %d bytes" % self.chunk.length() )
self.chunk_modified = True
self.modified = True
self.size = length
self._load_chunk( 0 )
logging.debug( "ftruncate complete" )
self._fflush()
def lock(self, cmd, owner, **kw):
logging.debug( "WARNING: locking unsupported" )
return 1
# The code here is much rather just a demonstration of the locking
# API than something which actually was seen to be useful.
# Advisory file locking is pretty messy in Unix, and the Python
# interface to this doesn't make it better.
# We can't do fcntl(2)/F_GETLK from Python in a platfrom independent
# way. The following implementation *might* work under Linux.
#
# if cmd == fcntl.F_GETLK:
# import struct
#
# lockdata = struct.pack('hhQQi', kw['l_type'], os.SEEK_SET,
# kw['l_start'], kw['l_len'], kw['l_pid'])
# ld2 = fcntl.fcntl(self.fd, fcntl.F_GETLK, lockdata)
# flockfields = ('l_type', 'l_whence', 'l_start', 'l_len', 'l_pid')
# uld2 = struct.unpack('hhQQi', ld2)
# res = {}
# for i in xrange(len(uld2)):
# res[flockfields[i]] = uld2[i]
#
# return fuse.Flock(**res)
# Convert fcntl-ish lock parameters to Python's weird
# lockf(3)/flock(2) medley locking API...
op = { fcntl.F_UNLCK : fcntl.LOCK_UN,
fcntl.F_RDLCK : fcntl.LOCK_SH,
fcntl.F_WRLCK : fcntl.LOCK_EX }[kw['l_type']]
if cmd == fcntl.F_GETLK:
return -errno.EOPNOTSUPP
elif cmd == fcntl.F_SETLK:
if op != fcntl.LOCK_UN:
op |= fcntl.LOCK_NB
elif cmd == fcntl.F_SETLKW:
pass
else:
return -errno.EINVAL
fcntl.lockf(self.fd, op, kw['l_start'], kw['l_len'])
@staticmethod
def get_dirty_file( path ):
if path in dirty_cache:
return( dirty_cache[ path ] )
else:
return None
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