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NFS: avoid infinite loop in pnfs_update_layout.

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[ Upstream commit 2fdbc20036acda9e5694db74a032d3c605323005 ]

If pnfsd_update_layout() is called on a file for which recovery has
failed it will enter a tight infinite loop.

NFS_LAYOUT_INVALID_STID will be set, nfs4_select_rw_stateid() will
return -EIO, and nfs4_schedule_stateid_recovery() will do nothing, so
nfs4_client_recover_expired_lease() will not wait.  So the code will
loop indefinitely.

Break the loop by testing the validity of the open stateid at the top of
the loop.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
NeilBrown 2024-02-28 11:24:53 +11:00 committed by Greg Kroah-Hartman
parent 9e0414220b
commit e5272645a0
1 changed files with 8 additions and 0 deletions
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8
fs/nfs/pnfs.c
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@ -2000,6 +2000,14 @@ pnfs_update_layout(struct inode *ino,
}
lookup_again:
if (!nfs4_valid_open_stateid(ctx->state)) {
trace_pnfs_update_layout(ino, pos, count,
iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_INVALID_OPEN);
lseg = ERR_PTR(-EIO);
goto out;
}
lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
if (IS_ERR(lseg))
goto out;