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Merge branch 'bugfixes'

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* bugfixes:
  pNFS/flexfiles: Fix an XDR encoding bug in layoutreturn
  pNFS/flexfiles: Improve merging of errors in LAYOUTRETURN
This commit is contained in:
Trond Myklebust 2016-01-22 11:02:36 -05:00
commit 6d45c042f3
2 changed files with 41 additions and 62 deletions
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6
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -1948,11 +1948,9 @@ ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
start = xdr_reserve_space(xdr, 4);
BUG_ON(!start);
if (ff_layout_encode_ioerr(flo, xdr, args))
goto out;
ff_layout_encode_ioerr(flo, xdr, args);
ff_layout_encode_iostats(flo, xdr, args);
out:
*start = cpu_to_be32((xdr->p - start - 1) * 4);
dprintk("%s: Return\n", __func__);
}

97
fs/nfs/flexfilelayout/flexfilelayoutdev.c
View File

@ -218,63 +218,55 @@ static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
err->length = end - err->offset;
}
static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err, u64 offset,
u64 length, int status, enum nfs_opnum4 opnum,
nfs4_stateid *stateid,
struct nfs4_deviceid *deviceid)
static int
ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
const struct nfs4_ff_layout_ds_err *e2)
{
return err->status == status && err->opnum == opnum &&
nfs4_stateid_match(&err->stateid, stateid) &&
!memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) &&
end_offset(err->offset, err->length) >= offset &&
err->offset <= end_offset(offset, length);
int ret;
if (e1->opnum != e2->opnum)
return e1->opnum < e2->opnum ? -1 : 1;
if (e1->status != e2->status)
return e1->status < e2->status ? -1 : 1;
ret = memcmp(&e1->stateid, &e2->stateid, sizeof(e1->stateid));
if (ret != 0)
return ret;
ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
if (ret != 0)
return ret;
if (end_offset(e1->offset, e1->length) < e2->offset)
return -1;
if (e1->offset > end_offset(e2->offset, e2->length))
return 1;
/* If ranges overlap or are contiguous, they are the same */
return 0;
}
static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old,
struct nfs4_ff_layout_ds_err *new)
{
if (!ds_error_can_merge(old, new->offset, new->length, new->status,
new->opnum, &new->stateid, &new->deviceid))
return false;
extend_ds_error(old, new->offset, new->length);
return true;
}
static bool
static void
ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
struct nfs4_ff_layout_ds_err *dserr)
{
struct nfs4_ff_layout_ds_err *err;
struct nfs4_ff_layout_ds_err *err, *tmp;
struct list_head *head = &flo->error_list;
int match;
list_for_each_entry(err, &flo->error_list, list) {
if (merge_ds_error(err, dserr)) {
return true;
}
}
list_add(&dserr->list, &flo->error_list);
return false;
}
static bool
ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset,
u64 length, int status, enum nfs_opnum4 opnum,
nfs4_stateid *stateid, struct nfs4_deviceid *deviceid)
{
bool found = false;
struct nfs4_ff_layout_ds_err *err;
list_for_each_entry(err, &flo->error_list, list) {
if (ds_error_can_merge(err, offset, length, status, opnum,
stateid, deviceid)) {
found = true;
extend_ds_error(err, offset, length);
/* Do insertion sort w/ merges */
list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
match = ff_ds_error_match(err, dserr);
if (match < 0)
continue;
if (match > 0) {
/* Add entry "dserr" _before_ entry "err" */
head = &err->list;
break;
}
/* Entries match, so merge "err" into "dserr" */
extend_ds_error(dserr, err->offset, err->length);
list_del(&err->list);
kfree(err);
}
return found;
list_add_tail(&dserr->list, head);
}
int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
@ -283,7 +275,6 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
gfp_t gfp_flags)
{
struct nfs4_ff_layout_ds_err *dserr;
bool needfree;
if (status == 0)
return 0;
@ -291,14 +282,6 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
if (mirror->mirror_ds == NULL)
return -EINVAL;
spin_lock(&flo->generic_hdr.plh_inode->i_lock);
if (ff_layout_update_ds_error(flo, offset, length, status, opnum,
&mirror->stateid,
&mirror->mirror_ds->id_node.deviceid)) {
spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
return 0;
}
spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
dserr = kmalloc(sizeof(*dserr), gfp_flags);
if (!dserr)
return -ENOMEM;
@ -313,10 +296,8 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
NFS4_DEVICEID4_SIZE);
spin_lock(&flo->generic_hdr.plh_inode->i_lock);
needfree = ff_layout_add_ds_error_locked(flo, dserr);
ff_layout_add_ds_error_locked(flo, dserr);
spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
if (needfree)
kfree(dserr);
return 0;
}