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NFSv4.1 mark layout when already returned 

When the file layout driver is fencing a DS, _pnfs_return_layout can be
called mulitple times per inode due to in-flight i/o referencing lsegs on it's
plh_segs list.

Remember that LAYOUTRETURN has been called, and do not call it again.
Allow LAYOUTRETURNs after a subsequent LAYOUTGET.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2012-06-20 15:03:33 -04:00 committed by Trond Myklebust
parent baf6c2a44a
commit 366d50521c
2 changed files with 27 additions and 2 deletions
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10
fs/nfs/pnfs.c
View File

@ -662,11 +662,11 @@ _pnfs_return_layout(struct inode *ino)
nfs4_stateid stateid;
int status = 0;
dprintk("--> %s\n", __func__);
dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
spin_lock(&ino->i_lock);
lo = nfsi->layout;
if (!lo) {
if (!lo || pnfs_test_layout_returned(lo)) {
spin_unlock(&ino->i_lock);
dprintk("%s: no layout to return\n", __func__);
return status;
@ -676,6 +676,7 @@ _pnfs_return_layout(struct inode *ino)
get_layout_hdr(lo);
mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
lo->plh_block_lgets++;
pnfs_mark_layout_returned(lo);
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&tmp_list);
@ -686,6 +687,7 @@ _pnfs_return_layout(struct inode *ino)
status = -ENOMEM;
set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
pnfs_clear_layout_returned(lo);
put_layout_hdr(lo);
goto out;
}
@ -1075,6 +1077,10 @@ pnfs_update_layout(struct inode *ino,
get_layout_hdr(lo);
if (list_empty(&lo->plh_segs))
first = true;
/* Enable LAYOUTRETURNs */
pnfs_clear_layout_returned(lo);
spin_unlock(&ino->i_lock);
if (first) {
/* The lo must be on the clp list if there is any

19
fs/nfs/pnfs.h
View File

@ -64,6 +64,7 @@ enum {
NFS_LAYOUT_ROC, /* some lseg had roc bit set */
NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
NFS_LAYOUT_INVALID, /* layout is being destroyed */
NFS_LAYOUT_RETURNED, /* layout has already been returned */
};
enum layoutdriver_policy_flags {
@ -255,6 +256,24 @@ struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *
bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
void nfs4_deviceid_purge_client(const struct nfs_client *);
static inline void
pnfs_mark_layout_returned(struct pnfs_layout_hdr *lo)
{
set_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
}
static inline void
pnfs_clear_layout_returned(struct pnfs_layout_hdr *lo)
{
clear_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
}
static inline bool
pnfs_test_layout_returned(struct pnfs_layout_hdr *lo)
{
return test_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
}
static inline int lo_fail_bit(u32 iomode)
{
return iomode == IOMODE_RW ?