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NFS41: make sure sending LAYOUTRETURN before close if marked so 

If layout is marked by NFS_LAYOUT_RETURN_BEFORE_CLOSE, we should always
send LAYOUTRETURN before close, and we don't need to do ROC drain if we
do send LAYOUTRETURN.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Peng Tao 2015-08-19 13:49:19 +08:00 committed by Trond Myklebust
parent 36319608e2
commit e755d638e9
1 changed files with 28 additions and 23 deletions
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51
fs/nfs/pnfs.c
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@ -1064,7 +1064,7 @@ bool pnfs_roc(struct inode *ino)
struct pnfs_layout_segment *lseg, *tmp;
nfs4_stateid stateid;
LIST_HEAD(tmp_list);
bool found = false, layoutreturn = false;
bool found = false, layoutreturn = false, roc = false;
spin_lock(&ino->i_lock);
lo = nfsi->layout;
@ -1072,7 +1072,7 @@ bool pnfs_roc(struct inode *ino)
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
goto out_noroc;
/* Don't return layout if we hold a delegation */
/* no roc if we hold a delegation */
if (nfs4_check_delegation(ino, FMODE_READ))
goto out_noroc;
@ -1083,36 +1083,41 @@ bool pnfs_roc(struct inode *ino)
goto out_noroc;
}
stateid = lo->plh_stateid;
/* always send layoutreturn if being marked so */
if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
&lo->plh_flags))
layoutreturn = pnfs_prepare_layoutreturn(lo);
pnfs_clear_retry_layoutget(lo);
list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
/* If we are sending layoutreturn, invalidate all valid lsegs */
if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
mark_lseg_invalid(lseg, &tmp_list);
found = true;
}
if (!found)
goto out_noroc;
if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
goto out_noroc;
lo->plh_return_iomode = IOMODE_ANY;
pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
/* pnfs_prepare_layoutreturn() grabs lo ref and it will be put
* in pnfs_roc_release(). We don't really send a layoutreturn but
* still want others to view us like we are sending one!
*
* If pnfs_prepare_layoutreturn() fails, it means someone else is doing
* LAYOUTRETURN, so we proceed like there are no layouts to return.
*
* ROC in three conditions:
* 1. there are ROC lsegs
* 2. we don't send layoutreturn
* 3. no others are sending layoutreturn
*/
if (found && !layoutreturn && pnfs_prepare_layoutreturn(lo))
roc = true;
out_noroc:
spin_unlock(&ino->i_lock);
pnfs_free_lseg_list(&tmp_list);
pnfs_layoutcommit_inode(ino, true);
return true;
out_noroc:
if (lo) {
stateid = lo->plh_stateid;
if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
&lo->plh_flags))
layoutreturn = pnfs_prepare_layoutreturn(lo);
}
spin_unlock(&ino->i_lock);
if (layoutreturn) {
pnfs_layoutcommit_inode(ino, true);
if (layoutreturn)
pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
}
return false;
return roc;
}
void pnfs_roc_release(struct inode *ino)