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470 lignes
13 KiB
470 lignes
13 KiB
#! /usr/bin/env python
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import random
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from optparse import OptionParser
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DEBUG = False
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def dprint(str):
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if DEBUG:
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print str
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printOps = True
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printState = True
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printFinal = True
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class bitmap:
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def __init__(self, size):
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self.size = size
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self.bmap = []
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for num in range(size):
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self.bmap.append(0)
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def alloc(self):
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for num in range(len(self.bmap)):
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if self.bmap[num] == 0:
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self.bmap[num] = 1
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return num
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return -1
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def free(self, num):
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assert(self.bmap[num] == 1)
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self.bmap[num] = 0
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def markAllocated(self, num):
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assert(self.bmap[num] == 0)
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self.bmap[num] = 1
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def dump(self):
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s = ''
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for i in range(len(self.bmap)):
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s += str(self.bmap[i])
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return s
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class block:
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def __init__(self, ftype):
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assert(ftype == 'd' or ftype == 'f' or ftype == 'free')
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self.ftype = ftype
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# only for directories, properly a subclass but who cares
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self.dirUsed = 0
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self.maxUsed = 32
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self.dirList = []
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self.data = ''
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def dump(self):
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if self.ftype == 'free':
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return '[]'
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elif self.ftype == 'd':
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rc = ''
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for d in self.dirList:
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# d is of the form ('name', inum)
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short = '(%s,%s)' % (d[0], d[1])
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if rc == '':
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rc = short
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else:
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rc += ' ' + short
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return '['+rc+']'
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# return '%s' % self.dirList
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else:
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return '[%s]' % self.data
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def setType(self, ftype):
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assert(self.ftype == 'free')
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self.ftype = ftype
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def addData(self, data):
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assert(self.ftype == 'f')
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self.data = data
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def getNumEntries(self):
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assert(self.ftype == 'd')
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return self.dirUsed
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def getFreeEntries(self):
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assert(self.ftype == 'd')
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return self.maxUsed - self.dirUsed
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def getEntry(self, num):
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assert(self.ftype == 'd')
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assert(num < self.dirUsed)
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return self.dirList[num]
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def addDirEntry(self, name, inum):
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assert(self.ftype == 'd')
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self.dirList.append((name, inum))
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self.dirUsed += 1
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assert(self.dirUsed <= self.maxUsed)
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def delDirEntry(self, name):
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assert(self.ftype == 'd')
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tname = name.split('/')
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dname = tname[len(tname) - 1]
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for i in range(len(self.dirList)):
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if self.dirList[i][0] == dname:
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self.dirList.pop(i)
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self.dirUsed -= 1
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return
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assert(1 == 0)
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def dirEntryExists(self, name):
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assert(self.ftype == 'd')
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for d in self.dirList:
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if name == d[0]:
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return True
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return False
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def free(self):
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assert(self.ftype != 'free')
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if self.ftype == 'd':
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# check for only dot, dotdot here
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assert(self.dirUsed == 2)
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self.dirUsed = 0
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self.data = ''
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self.ftype = 'free'
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class inode:
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def __init__(self, ftype='free', addr=-1, refCnt=1):
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self.setAll(ftype, addr, refCnt)
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def setAll(self, ftype, addr, refCnt):
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assert(ftype == 'd' or ftype == 'f' or ftype == 'free')
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self.ftype = ftype
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self.addr = addr
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self.refCnt = refCnt
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def incRefCnt(self):
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self.refCnt += 1
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def decRefCnt(self):
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self.refCnt -= 1
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def getRefCnt(self):
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return self.refCnt
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def setType(self, ftype):
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assert(ftype == 'd' or ftype == 'f' or ftype == 'free')
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self.ftype = ftype
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def setAddr(self, block):
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self.addr = block
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def getSize(self):
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if self.addr == -1:
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return 0
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else:
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return 1
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def getAddr(self):
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return self.addr
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def getType(self):
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return self.ftype
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def free(self):
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self.ftype = 'free'
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self.addr = -1
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class fs:
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def __init__(self, numInodes, numData):
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self.numInodes = numInodes
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self.numData = numData
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self.ibitmap = bitmap(self.numInodes)
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self.inodes = []
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for i in range(self.numInodes):
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self.inodes.append(inode())
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self.dbitmap = bitmap(self.numData)
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self.data = []
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for i in range(self.numData):
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self.data.append(block('free'))
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# root inode
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self.ROOT = 0
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# create root directory
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self.ibitmap.markAllocated(self.ROOT)
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self.inodes[self.ROOT].setAll('d', 0, 2)
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self.dbitmap.markAllocated(self.ROOT)
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self.data[0].setType('d')
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self.data[0].addDirEntry('.', self.ROOT)
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self.data[0].addDirEntry('..', self.ROOT)
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# these is just for the fake workload generator
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self.files = []
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self.dirs = ['/']
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self.nameToInum = {'/':self.ROOT}
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def dump(self):
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print 'inode bitmap ', self.ibitmap.dump()
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print 'inodes ',
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for i in range(0,self.numInodes):
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ftype = self.inodes[i].getType()
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if ftype == 'free':
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print '[]',
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else:
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print '[%s a:%s r:%d]' % (ftype, self.inodes[i].getAddr(), self.inodes[i].getRefCnt()),
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print ''
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print 'data bitmap ', self.dbitmap.dump()
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print 'data ',
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for i in range(self.numData):
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print self.data[i].dump(),
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print ''
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def makeName(self):
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p = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
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return p[int(random.random() * len(p))]
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def inodeAlloc(self):
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return self.ibitmap.alloc()
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def inodeFree(self, inum):
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self.ibitmap.free(inum)
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self.inodes[inum].free()
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def dataAlloc(self):
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return self.dbitmap.alloc()
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def dataFree(self, bnum):
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self.dbitmap.free(bnum)
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self.data[bnum].free()
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def getParent(self, name):
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tmp = name.split('/')
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if len(tmp) == 2:
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return '/'
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pname = ''
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for i in range(1, len(tmp)-1):
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pname = pname + '/' + tmp[i]
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return pname
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def deleteFile(self, tfile):
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if printOps:
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print 'unlink("%s");' % tfile
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inum = self.nameToInum[tfile]
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# YOUR CODE, YOUR ID
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# IF inode.refcnt ==1, THEN free data blocks first, then free inode, ELSE dec indoe.refcnt
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# remove from parent directory: delete from parent inum, delete from parent addr
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# DONE
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# finally, remove from files list
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self.files.remove(tfile)
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return 0
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def createLink(self, target, newfile, parent):
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# YOUR CODE, YOUR ID
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# find info about parent
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# is there room in the parent directory?
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# if the newfile was already in parent dir?
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# now, find inumber of target
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# inc parent ref count
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# now add to directory
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# DONE
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return tinum
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def createFile(self, parent, newfile, ftype):
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# YOUR CODE, YOUR ID
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# find info about parent
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# is there room in the parent directory?
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# have to make sure file name is unique
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# find free inode
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# if a directory, have to allocate directory block for basic (., ..) info
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# now ok to init inode properly
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# inc parent ref count
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# and add to directory of parent
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# DONE
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return inum
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def writeFile(self, tfile, data):
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inum = self.nameToInum[tfile]
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curSize = self.inodes[inum].getSize()
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dprint('writeFile: inum:%d cursize:%d refcnt:%d' % (inum, curSize, self.inodes[inum].getRefCnt()))
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# YOUR CODE, YOUR ID
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# file is full?
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# no data blocks left
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# write file data
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# DONE
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if printOps:
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print 'fd=open("%s", O_WRONLY|O_APPEND); write(fd, buf, BLOCKSIZE); close(fd);' % tfile
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return 0
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def doDelete(self):
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dprint('doDelete')
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if len(self.files) == 0:
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return -1
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dfile = self.files[int(random.random() * len(self.files))]
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dprint('try delete(%s)' % dfile)
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return self.deleteFile(dfile)
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def doLink(self):
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dprint('doLink')
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if len(self.files) == 0:
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return -1
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parent = self.dirs[int(random.random() * len(self.dirs))]
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nfile = self.makeName()
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# pick random target
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target = self.files[int(random.random() * len(self.files))]
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# get full name of newfile
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if parent == '/':
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fullName = parent + nfile
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else:
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fullName = parent + '/' + nfile
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dprint('try createLink(%s %s %s)' % (target, nfile, parent))
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inum = self.createLink(target, nfile, parent)
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if inum >= 0:
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self.files.append(fullName)
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self.nameToInum[fullName] = inum
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if printOps:
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print 'link("%s", "%s");' % (target, fullName)
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return 0
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return -1
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def doCreate(self, ftype):
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dprint('doCreate')
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parent = self.dirs[int(random.random() * len(self.dirs))]
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nfile = self.makeName()
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if ftype == 'd':
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tlist = self.dirs
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else:
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tlist = self.files
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if parent == '/':
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fullName = parent + nfile
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else:
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fullName = parent + '/' + nfile
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dprint('try createFile(%s %s %s)' % (parent, nfile, ftype))
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inum = self.createFile(parent, nfile, ftype)
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if inum >= 0:
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tlist.append(fullName)
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self.nameToInum[fullName] = inum
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if parent == '/':
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parent = ''
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if ftype == 'd':
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if printOps:
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print 'mkdir("%s/%s");' % (parent, nfile)
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else:
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if printOps:
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print 'creat("%s/%s");' % (parent, nfile)
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return 0
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return -1
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def doAppend(self):
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dprint('doAppend')
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if len(self.files) == 0:
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return -1
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afile = self.files[int(random.random() * len(self.files))]
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dprint('try writeFile(%s)' % afile)
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data = chr(ord('a') + int(random.random() * 26))
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rc = self.writeFile(afile, data)
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return rc
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def run(self, numRequests):
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self.percentMkdir = 0.40
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self.percentWrite = 0.40
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self.percentDelete = 0.20
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self.numRequests = numRequests
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print 'Initial state'
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print ''
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self.dump()
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print ''
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for i in range(numRequests):
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if printOps == False:
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print 'Which operation took place?'
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rc = -1
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while rc == -1:
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r = random.random()
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if r < 0.3:
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rc = self.doAppend()
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dprint('doAppend rc:%d' % rc)
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elif r < 0.5:
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rc = self.doDelete()
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dprint('doDelete rc:%d' % rc)
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elif r < 0.7:
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rc = self.doLink()
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dprint('doLink rc:%d' % rc)
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else:
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if random.random() < 0.75:
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rc = self.doCreate('f')
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dprint('doCreate(f) rc:%d' % rc)
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else:
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rc = self.doCreate('d')
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dprint('doCreate(d) rc:%d' % rc)
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if printState == True:
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print ''
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self.dump()
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print ''
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else:
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print ''
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print ' State of file system (inode bitmap, inodes, data bitmap, data)?'
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print ''
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if printFinal:
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print ''
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print 'Summary of files, directories::'
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print ''
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print ' Files: ', self.files
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print ' Directories:', self.dirs
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print ''
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#
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# main program
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#
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parser = OptionParser()
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parser.add_option('-s', '--seed', default=0, help='the random seed', action='store', type='int', dest='seed')
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parser.add_option('-i', '--numInodes', default=8, help='number of inodes in file system', action='store', type='int', dest='numInodes')
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parser.add_option('-d', '--numData', default=8, help='number of data blocks in file system', action='store', type='int', dest='numData')
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parser.add_option('-n', '--numRequests', default=10, help='number of requests to simulate', action='store', type='int', dest='numRequests')
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parser.add_option('-r', '--reverse', default=False, help='instead of printing state, print ops', action='store_true', dest='reverse')
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parser.add_option('-p', '--printFinal', default=False, help='print the final set of files/dirs', action='store_true', dest='printFinal')
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(options, args) = parser.parse_args()
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print 'ARG seed', options.seed
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print 'ARG numInodes', options.numInodes
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print 'ARG numData', options.numData
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print 'ARG numRequests', options.numRequests
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print 'ARG reverse', options.reverse
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print 'ARG printFinal', options.printFinal
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print ''
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random.seed(options.seed)
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if options.reverse:
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printState = False
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printOps = True
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else:
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printState = True
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printOps = False
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printOps = True
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printState = True
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printFinal = options.printFinal
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#
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# have to generate RANDOM requests to the file system
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# that are VALID!
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#
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f = fs(options.numInodes, options.numData)
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#
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# ops: mkdir rmdir : create delete : append write
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#
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f.run(options.numRequests)
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