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pnfs: track last_offset for layoutcommit

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iozone tests were failing intermittently against emc-2 due to out-of-order LAYOUTCOMMITs that both specified new_last_offset

nfs41_open_state now maintains a cached value of the last_offset, and avoids sending it with LAYOUTCOMMIT unless the new last_offset is greater than the cached offset.  this cached value is initialized on open/delegation, and updated on setattr for size

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2011-09-02 14:57:07 -04:00 • committed by unknown
parent 93a907082c
commit 6872152317
4 changed files with 50 additions and 15 deletions
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53
daemon/pnfs_io.c
View file

@ -475,6 +475,44 @@ out:
return status;
}
static enum pnfs_status layout_commit(
IN nfs41_open_state *state,
IN pnfs_layout_state *layout,
IN uint64_t offset,
IN uint64_t length)
{
stateid4 layout_stateid;
uint64_t last_offset = offset + length - 1;
uint64_t *new_last_offset = NULL;
enum nfsstat4 nfsstat;
enum pnfs_status status = PNFS_SUCCESS;
AcquireSRWLockExclusive(&state->lock);
/* if this is past the current eof, update the open state's
* last offset, and pass a pointer to LAYOUTCOMMIT */
if (state->pnfs_last_offset < last_offset ||
(state->pnfs_last_offset == 0 && last_offset == 0)) {
state->pnfs_last_offset = last_offset;
new_last_offset = &last_offset;
}
ReleaseSRWLockExclusive(&state->lock);
AcquireSRWLockShared(&layout->lock);
memcpy(&layout_stateid, &layout->stateid, sizeof(layout_stateid));
ReleaseSRWLockShared(&layout->lock);
dprintf(1, "LAYOUTCOMMIT for offset=%lld len=%lld new_last_offset=%u\n",
offset, length, new_last_offset ? 1 : 0);
nfsstat = pnfs_rpc_layoutcommit(state->session, &state->file,
&layout_stateid, offset, length, new_last_offset, NULL);
if (nfsstat) {
dprintf(IOLVL, "pnfs_rpc_layoutcommit() failed with %s\n",
nfs_error_string(nfsstat));
status = PNFSERR_IO;
}
return status;
}
enum pnfs_status pnfs_write(
IN nfs41_root *root,
IN nfs41_open_state *state,
@ -523,20 +561,7 @@ enum pnfs_status pnfs_write(
}
} else if (stable == DATA_SYNC4) {
/* send LAYOUTCOMMIT to sync the metadata */
stateid4 layout_stateid;
uint64_t new_last_offset = offset + *len_out - 1;
AcquireSRWLockShared(&layout->lock);
memcpy(&layout_stateid, &layout->stateid, sizeof(layout_stateid));
ReleaseSRWLockShared(&layout->lock);
nfsstat = pnfs_rpc_layoutcommit(state->session, &state->file,
&layout_stateid, offset, *len_out, &new_last_offset, NULL);
if (nfsstat) {
dprintf(IOLVL, "pnfs_rpc_layoutcommit() failed with %s\n",
nfs_error_string(nfsstat));
status = PNFSERR_IO;
}
status = layout_commit(state, layout, offset, *len_out);
}
out_free_pattern:
pattern_free(&pattern);