nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE
commit7ff4cff637
upstream. A pNFS server may return LAYOUTUNAVAILABLE error on LAYOUTGET for files which don't have any layout. In this situation pnfs_update_layout currently returns NULL. As this NULL is converted into ENOMEM, IO requests fails instead of falling back to MDS. Do not return ENOMEM on LAYOUTUNAVAILABLE and let client retry through MDS. Fixes8d40b0f148
. I will suggest to backport this fix to affected stable branches. Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de> [trondmy: Use IS_ERR_OR_NULL()] Fixes:8d40b0f148
("NFS filelayout:call GETDEVICEINFO after...") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -895,9 +895,7 @@ fl_pnfs_update_layout(struct inode *ino,
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lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode,
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gfp_flags);
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if (!lseg)
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lseg = ERR_PTR(-ENOMEM);
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if (IS_ERR(lseg))
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if (IS_ERR_OR_NULL(lseg))
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goto out;
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lo = NFS_I(ino)->layout;
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