[fuse-devel] Learning fuse

[Preeti G. <pre...@gm...>]

Hello,

I need to make certain changes in how Fuse stores and reads files/directories. So I am trying to understand the flow.

I setup xmp sample file system I got on the internet and added print statements and did 'touch l.txt' which is not existing. Now in the log I see it called getattr ( which said no such file exists. )and then goes to init ( defined in Fuse File class) with the data    create[149020332] flags: 0x8841 /l.txt  and then fgetattr and finally calls flush, lock, flush again and lock again and then release.

Who is writing the file to the disk? Is it init function writing file to the disk? I thought init is just for initial setup if I need to do and shouldn't it be calling mknod here? I have print statements in all the methods but its not calling them. 

unique: 295, opcode: LOOKUP (1), nodeid: 1, insize: 46, pid: 3155
LOOKUP /l.txt
getattr /l.txt
   unique: 295, error: -2 (No such file or directory), outsize: 16
unique: 296, opcode: CREATE (35), nodeid: 1, insize: 62, pid: 3155
create flags: 0x8841 /l.txt 0100664 umask=0002
************ inside file init
   create[149020332] flags: 0x8841 /l.txt
fgetattr[149020332] /l.txt
********************* inside file fgetattr
   NODEID: 13
   unique: 296, success, outsize: 160
unique: 297, opcode: FLUSH (25), nodeid: 13, insize: 64, pid: 3155
flush[149020332]
********************* inside file flush
******************* inside file flush
lock[149020332] F_SETLK F_UNLCK start: 0 len: 0 pid: 0
********************* inside file lock
   unique: 297, success, outsize: 16
unique: 298, opcode: SETATTR (4), nodeid: 13, insize: 128, pid: 3155
utime /l.txt 1363022904 1363022904
getattr /l.txt
   unique: 298, success, outsize: 120
unique: 299, opcode: FLUSH (25), nodeid: 13, insize: 64, pid: 3155
flush[149020332]
********************* inside file flush
******************* inside file flush
lock[149020332] F_SETLK F_UNLCK start: 0 len: 0 pid: 0
********************* inside file lock
   unique: 299, success, outsize: 16
unique: 300, opcode: RELEASE (18), nodeid: 13, insize: 64, pid: 0
release[149020332] flags: 0x8801
***************** inside file release
   unique: 300, success, outsize: 16

-preeti