mac os x file systems - osxbook.com os x file systems. ... fuse-dbfs tagsfs cromfs mysqlfs yacufs...
TRANSCRIPT
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Mac OS XFile Systems
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Had to give it a shot!
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Most ideas come from previous ideas.
Alan Kay
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Looking Back
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This means that the return which isexecuted immediately after the callto aretu actually returns from the lastroutine which did the savu.
They are notexpected tounderstand this.
You are not expectedto understand this.
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The most importantrole of UNIX is to
provide a file system.
UNIX
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This means that the return which isexecuted immediately after the callto aretu actually returns from the lastroutine which did the savu.
They are notexpected tounderstand this.
You are not expectedto understand this.
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The most importantrole of UNIX is to
provide a file system.
UNIX
Everything is a file.
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System Call Layer
User Program
System Calls
User
Kernel
The File System
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User
Kernel
File System 1
System Call Layer
User Program
File System 2
Which?
System Calls
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User
Kernel
FS1
System Call Layer
User Program
FS2 FS3 FSn...
Which?
System Calls
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Some File System
User
Kernel
Create()Remove()Read()Write()...
node1
noden
...
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... ...v1
vn
vn+1
vn+m
Vnode/VFS
HFS+
hfs_create()
hfs_remove()
hfs_read()
hfs_write()...
...h1
hn
...
UFS
u1
um
ufs_create()
ufs_remove()
ufs_read()
ufs_write()...
Kernel
User
System Call Layer
User Program
File Systems
VNOP_CREATE()
VNOP_REMOVE()
VNOP_READ()
VNOP_WRITE()...
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HFS+
HFS
UFS
UDF
ISO9660
NTFS
MS-DOS
AFP
SMB/CIFS
NFS
WebDAV
FTP
cddafs
devfs
fdesc
deadfs fifofs specfs
synthfs union volfs
ZFS
Many File Systems
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Malloc/Free Abstraction
No partitions (just storage pool)
Automatically grows/shrinks
Pool’s storage shared across file systems
Transactional (no journal, no fsck)
Copy-on-write, checksummed
ZFS
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Inside HFS+
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...
# Top 10 Files with the Most Extents
1 632 183.10 2163846 Macintosh HD:/.Spotlight-V100/.store.db
2 618 187.24 2163845 Macintosh HD:/.Spotlight-V100/store.db
...
Out of 2252467 non-zero data forks total, 2252128 (99.98 %) have no fragmentation.
sudo hfsdebug -f -t 10$
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# Free Contig Starting@ Ending@ Space
...
101813 0x2e1097b 0x2e2972f 397.71MB
127220 0x48f0c 0x67fff 496.95MB
238304 0x2dca9cd 0x2e04cac 930.88MB
...
sudo hfsdebug -0 | sort -n +1$
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...
next allocation search at block = 0x2c0f7d6
next unused catalog node ID = 4042316
file system write count = 138418087
...
sudo hfsdebug -m$
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Demos
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http://osxbook.com/software/hfsdebug/
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File System Activity
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KernelFirmware
// Obtain handle for simple read file accessStatus = OpenSimpleReadFile( FALSE, // loading a boot selection? NULL, // optional source buffer 0, // source buffer size &FilePath, &DeviceHandle, // OUT &SimpleReadHandle // OUT );...Status = ReadSimpleReadFile( SimpleReadHandle, // file handle (UINTN)NBytes, // offset &ReadSize, // number of bytes (VOID *)Buffer); // buffer
EFIKernel Core File
Quota Files
Kernel Symbols File
File System Journals
HFS+ B-Tree (Hotfiles)
...
Kernel
GeneratingFile System Activity
int error;
vnode_t vp;
error = vnode_open(“file”, O_CREAT|FWRITE,
..., &vp, ...);
...
error = vn_rdwr(UIO_WRITE, vp, ...);
...
error = vnode_close(vp, FWRITE, ...);
User
Kernel
HFS+ UFS NFS...
Vnode/VFS Layer
BSD Interfaces (libSystem)
CarbonCarbon File Manager
CocoaNSFileManager
Carbon App Cocoa App X11 App
“Terminal” Commands
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MonitoringFile System Activity
fsevents
Kauth
kdebug
DTrace (Leopard onwards)
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User
Kernel
User Program
System Call Layer
System CallHandler Functions
/dev/fsevents
...
FS Events
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Kernel
vnode_authorize()
VFS Layer
File Systems File Execution
Kauth Layer
Result
No ListenersHave Listeners
Call Each Listener
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User
Kernel
fs_usage sc_usagelatency
...
Kdebug Trace Buffer
KERNEL_DEBUG*()
Kernel Code
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ModifyingFile System Activity
Permissions and ACLs
Kauth
Storage Filter Scheme
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User
Kernel
User Program
Device Services
Transport Services
Physical Interconnect
Device
...
YourKernel
Extension
Filter
Write Read
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Demos
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HostingFile System Activity
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NFSClient
NFSServer
FTP FS
User Program
NFS ProtocolUser
Kernel
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User
Kernel
WebDAVVFS
KernelExtension
mount_webdavUserProgram
Custom Protocol(AF_UNIX Socket)
...
Local Cache
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HostingFile System Activity
Difficult.
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Until Today.
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MacFUSE
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MacFUSEVFS
libfuse
YourFile
System User Program
/dev/fuseUser
Kernel
Sourceof
Data
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sshfs
owfs
encfs
Run-Time-Access
PhoneBook
KIO Fuse Gateway
LUFS Bridge
Bluetooth
mcachefs
RelFS
gphoto2-fuse-fs
CvsFS
Siefs User-Level Versioning
Offline Media Content DB
ntfsmount
cddfs
BitTorrent
djmount
fusecram
fuseiso Logic
FUSE&DPAPcompFUSED
DBToy
FUSECompres
CopyFS
GnomeVFS2FUSE
archivemount
FUSE::DBI
LoggedFS
LZOlayer
fusepak
FunionFS
MythTVfs
Captive NTFS
unionfs-fuse
Lkarmafs
Apretujado
CryptoFSAfuse
FUSEPod
Mountlo
fuse_adfsrarfs
localfs
dereferencefs
fsfipi
LAFSunpackfs
hierfs
fuse-dbfsTagsFS
Cromfs
mysqlfs
yacufs
ZFS
ferrisfuse
FURntfs-3g
playlistfs
gcfuse wadfs
mp3fs
DVDfs
Hyppocampus
ltspfsrofs
beaglefs gitfs
fusedaap
spgmfs
fdmsfs
mediamax-fuse FunFS
SMB for FUSE
Fusedav
GmailFSSMBNetFS
GfarmFS
httpfs
Clustered RAID
HTTP-FUSE
WikipediaFS
wdfsFuseFTP
FlickrFS
FSFS NOOFSGrifi
BlogFS
OpenomyFS
ELFI
CurlFtpFS
wikifuse
9pfuse
PUFSGlusterFS
usmb
TrackerFS
obexfs
afpfs-ng
GSpaceFS
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Demos
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What’s Being Released
MacFUSE VFS kernel extension
Mac OS X patch for libfuse
Mac OS X patch for sshfs
A Universal Binary tarball
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http://code.google.com/p/macfuse
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Thanks
FUSE Developers on Linux and FreeBSD
My Team
You
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Q/A