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voldfs.py
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voldfs.py
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#!/usr/bin/python
"""
Copyright (c) 2010, Jeff Darcy <jeff@pl.atyp.us>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""
import errno
import os
import string
import struct
import sys
import traceback
import fuse
fuse.fuse_python_api = (0,2)
db = __import__(os.getenv("VOLDFS_DB","voldemort"))
import vfs_base
import vfs_dir
class NullObject:
pass
class Collector:
def __init__ (self):
self.result = []
def __call__ (self, name, ptr, hash):
self.result.append((name,hash))
class VoldFS (fuse.Fuse):
def __init__ (self, fs, root):
fuse.Fuse.__init__(self,dash_s_do="setsingle")
self.fs = fs
self.root = root
def fsinit (self):
try:
if self.fs.store.auto_mkfs:
vfs_dir.mkdir(self.fs,self.root,0755)
except:
print "This storage type requires mkfs first"
def getattr (self, path):
ptr = vfs_dir.lookup(self.fs,self.root,path)
if ptr == None:
return -errno.ENOENT
try:
idata, vector = self.fs.get_inode(ptr)
inode = struct.unpack(vfs_base.INODE_FMT,
idata[:vfs_base.INODE_SZ])
except:
print "<<<%s>>>" % repr(ptr)
traceback.print_exc()
return -errno.EIO
it = NullObject()
it.st_mode = inode[0]
it.st_ino = inode[1]
it.st_dev = inode[2]
it.st_nlink = inode[3]
it.st_uid = inode[4]
it.st_gid = inode[5]
it.st_size = inode[6]
it.st_atime = inode[7]
it.st_mtime = inode[8]
it.st_ctime = inode[9]
return it
def mkdir (self, path, mode):
parts = path.split("/")
parent = string.join(parts[:-1],"/")
child = parts[-1]
pptr = vfs_dir.lookup(self.fs,self.root,parent)
if pptr == None:
return -errno.ENOENT
cptr = vfs_base.get_new_key()
vfs_dir.mkdir(self.fs,cptr,mode)
try:
vfs_dir.link(self.fs,pptr,child,cptr)
except vfs_dir.DupFileExc:
return -errno.EEXIST
def opendir (self, path):
print "in opendir"
def readdir (self, path, offset=0):
print "in readdir(%s,0x%x)" % (path, offset)
ptr = vfs_dir.lookup(self.fs,self.root,path)
if ptr == None:
raise IOError, "directory not found"
return
coll = Collector()
vfs_dir.enum(self.fs,ptr,coll,offset)
for name, hash in coll.result:
x = fuse.Direntry(name)
x.ino = hash
yield x
def create (self, path, flags, mode):
print "in create(%s,0x%x,0x%x)" % (path, flags, mode)
parts = path.split("/")
parent = string.join(parts[:-1],"/")
child = parts[-1]
pptr = vfs_dir.lookup(self.fs,self.root,parent)
if pptr == None:
return -errno.ENOENT
cptr = vfs_base.get_new_key()
self.fs.create_inode(cptr,mode)
try:
vfs_dir.link(self.fs,pptr,child,cptr)
except vfs_dir.DupFileExc:
return -errno.EEXIST
def write (self, path, buf, offset, fh=None):
ptr = vfs_dir.lookup(self.fs,self.root,path)
if ptr == None:
return -errno.ENOENT
return self.fs.put_data(ptr,offset,buf)
def read (self, path, length, offset, fh=None):
ptr = vfs_dir.lookup(self.fs,self.root,path)
if ptr == None:
return -errno.ENOENT
total = ''
while len(total) < length:
new_data = self.fs.get_data(ptr,offset,length)
if not len(new_data):
break
total += new_data
offset += len(new_data)
return total
def unlink (self, path):
print "in unlink(%s)" % path
parts = path.split("/")
parent = string.join(parts[:-1],"/")
child = parts[-1]
pptr = vfs_dir.lookup(self.fs,self.root,parent)
if pptr == None:
return -errno.ENOENT
return vfs_dir.unlink(self.fs,pptr,child)
def chmod (self, path, mode):
print "in chmod(%s,0x%x)" % (path, mode)
def chown (self, path, user, group):
print "in chown(%s,%d,%d)" % (path, user, group)
def truncate (self, path, len):
print "in truncate(%s,%d)" % (path, len)
def utime (self, path, times):
print "in utimes(%s)" % path
def statfs (self):
print "in statfs"
svf = NullObject()
svf.f_bsize = vfs_base.BLOCK_SZ
svf.f_frsize = vfs_base.BLOCK_SZ
svf.f_blocks = 1000000
svf.f_bfree = 800000
svf.f_bavail = 100000
svf.f_files = 1000
svf.f_ffree = 10000
svf.f_favail = 1000
svf.f_flag = 0
svf.f_namemax = vfs_dir.MAX_NAME_LEN
return svf
if __name__ == "__main__":
# I don't have enough patience for the hairball that is FUSE option
# parsing. I have the actual arguments, I'll extract the ones I
# want myself thankyouverymuch.
i = 0
while i < len(sys.argv):
this_arg = sys.argv[i]
if (len(this_arg) >= 2) and (this_arg[:2] == "-0"):
if len(this_arg) > 2:
arg_text = this_arg[2:]
else:
arg_text = sys.argv[i+1]
del sys.argv[i+1]
del sys.argv[i]
print "my opts = %s" % arg_text
for opt in arg_text.split(","):
key, value = opt.split("=")
if key == "host":
print "<<host = %s>>" % value
elif key == "port":
print "<<port = %s>>" % value
elif key == "db":
print "<<db = %s>>" % value
else:
print "unknown key/value %s" % opt
else:
i += 1
store = db.StoreClient("test",[("localhost",6666)])
fs = vfs_base.FS(store)
vfs = VoldFS(fs,"root")
vfs.parse()
vfs.main()