Dear All,
Currently, I’m using the class Filer to operate the OSD directly. And below list the codes.
The write_trunc routing return success, but I can’t read back the object, and I got r = -2, -ENOENT.
Would anyone help me to answer the question that how to use those functions? Thanks!
The input parameters are:
in->ino = 0x10000000035;
In->layout.fl_stripe_unit = stripe_unit = 4194304;
In->layout.fl_stripe_count = stripe_count = 1;
In->layout.fl_object_size = object_size = 4194304;
In->layout.fl_pg_pool = 0;
in->snaprealm = new SnapRealm(in->ino);
in->snaprealm->build_snap_context();
The writing code looks like this.
Mutex flock("MClient::_write flock");
Cond cond;
bool done = false;
Context *onfinish = new C_SafeCond(&flock, &cond, &done);
Context *onsafe = new C_Client_SyncCommit(this, in);
unsafe_sync_write++;
get_cap_ref(in, CEPH_CAP_FILE_BUFFER); // released by onsafe callback
r = filer->write_trunc(in->ino, &in->layout, in->snaprealm->get_snap_context(),
offset, size, bl, ceph_clock_now(cct), 0,
in->truncate_size, in->truncate_seq,
onfinish, onsafe);
if (r < 0)
goto done;
client_lock.Unlock();
flock.Lock();
while (!done)
cond.Wait(flock);
flock.Unlock();
The reading code looks like this.
Mutex flock("MClient::_read_sync flock");
bool done = false;
Context *onfinish = new C_SafeCond(&flock, &cond, &done, &r);
bufferlist tbl;
int wanted = left;
filer->read_trunc(in->ino, &in->layout, in->snapid,
pos, left, &tbl, 0,
in->truncate_size, in->truncate_seq,
onfinish);
client_lock.Unlock();
flock.Lock();
while (!done)
cond.Wait(flock);
flock.Unlock();
Thomas
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